CN109387717B - Handheld portable servo valve tester and testing method - Google Patents

Handheld portable servo valve tester and testing method Download PDF

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CN109387717B
CN109387717B CN201811374680.8A CN201811374680A CN109387717B CN 109387717 B CN109387717 B CN 109387717B CN 201811374680 A CN201811374680 A CN 201811374680A CN 109387717 B CN109387717 B CN 109387717B
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resistor
operational amplifier
module
analog operational
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CN109387717A (en
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姚坤杉
王直
丁建军
王益山
束秋霞
马金科
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Jiangsu University of Science and Technology
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Jiangsu University of Science and Technology
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

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Abstract

The invention discloses a handheld portable servo valve tester, which comprises a handheld shell, a servo valve connector, a power supply module, an instruction signal generator, a valve core testing module, a signal acquisition and display module, a servo valve connector port enabling module, a servo valve connector output power supply switching module and a working state indicating module. The hand-held portable servo valve tester provided by the invention can provide power supply and input signals for the servo valve. The tester has the advantages of small volume, handholding, convenient carrying and operation, high-efficiency DC/DC conversion, high precision, multiple ranges and high stability of current or voltage output through the multi-stage closed-loop control circuit, free I/V switching, capability of providing various power signals and instruction signals for the tested servo valve, high output power of the tester, simple debugging and maintenance, strong universality, capability of realizing various performances and fault tests of the tested servo valve, and greatly improved test efficiency.

Description

Handheld portable servo valve tester and testing method
Technical Field
The invention belongs to the technical field of test instruments, and discloses a portable servo valve tester and a test method thereof, which can provide various power supplies and input signals for a servo valve and determine the motion position of a valve core by monitoring the output signal of the valve core.
Background
In the fields of modern aerospace, ships, metallurgy, chemical engineering and the like, an electro-hydraulic servo control system is widely applied, an electro-hydraulic servo valve is used as a core device of the electro-hydraulic servo system and is tightly connected with a mechanical action system and an electrical control system, and the quality of the electro-hydraulic servo valve directly influences the control precision of the whole electro-hydraulic servo system, so that the electro-hydraulic servo valve is particularly important in testing and maintenance. The conventional tester is mainly customized, can test a servo valve with a specific model, adopts a control system of a sensor, a data acquisition card, an industrial personal computer and an electric controller as test hardware, has relatively large volume and is not convenient and fast to move, and can not meet the test requirements of servo valves with different models and different functions. A hand-held portable servo valve tester and a test method of patent number CN201710468329.4 provide a servo valve tester, which can be moved conveniently and meet the test requirements of various types of servo valves, but the output current of the servo valve tester is 250mA at most, and cannot meet the test requirements of high-power servo valves, for example, the servo valve of germany schneider is mainly of a direct-acting type structure, and the driving current is 300mA generally; and the method of testing through the servo valve connector can only test for a specific servo valve, and the universality is not strong.
Disclosure of Invention
The invention aims to provide a portable servo valve tester and a testing method, which can be moved conveniently and meet the testing requirements of various types and high-power servo valves.
In order to achieve the purpose, the invention adopts the technical scheme that: a hand-held portable servo valve tester comprises a hand-held shell, a servo valve connector arranged on the hand-held shell, a power module, an instruction signal generator, a valve core testing module, a signal acquisition and display module, a servo valve connector port enabling module, a servo valve connector output power switching module and a working state indicating module, wherein the power module, the instruction signal generator, the valve core testing module, the signal acquisition and display module, the servo valve connector port enabling module, the servo valve connector output power switching module and the working state indicating module are arranged in the hand-held shell; the valve core testing module is internally provided with a first valve core testing module and a second valve core testing module, the first valve core testing module comprises C, D, E, F, PE, 24V/2A, GND, +15V and-15V multiple discrete testing jacks, the second valve core testing module comprises +5V, GND, Ibatt and +/-10V multiple discrete testing jacks, and each testing jack of the valve core testing module and each connecting terminal of the servo valve connector are respectively connected with a corresponding end of the command signal generator; the instruction signal generator comprises a signal input and output module, a signal processing module, a constant current source module and a signal switching module, wherein the signal processing module, the constant current source module and the signal switching module are respectively connected with the signal input and output module; the power supply module is respectively connected with the instruction signal generator, the signal acquisition and display module, the signal input and output module, the servo valve connector port enabling module, the servo valve connector output power supply switching module and the working state indicating module, and supplies power to the connected tested servo valve through the valve core testing module and the servo valve connector.
Furthermore, the hand-held shell is made of PA66 plastic and mainly comprises an upper cover and a lower bottom, a sealing groove is arranged at the joint of the upper cover and the lower bottom, and a silicon rubber sealing ring is arranged in the sealing groove; the signal switching module comprises a wave band switch and a potentiometer, and different signals can be switched, and rubber gaskets are arranged at positions where the wave band switch and a knob of the potentiometer are in contact with the upper cover.
Furthermore, the servo valve connector comprises two seven-core aviation plugs and a connecting cable, wherein one aviation plug is connected with the tester, the other aviation plug is connected with the tested servo valve, signals and power are transmitted through the connecting cable, and the sockets of the two aviation plugs are inconsistent, so that wrong insertion is prevented; the connecting cable adopts RVSP twisted-pair shielded wire, has strong anti-interference capability and has fireproof and flame-retardant effects.
Further, the power supply module comprises a battery, a battery management module, a 24V-to- +/-15V adjustable power supply conversion module and a 24V-to- +5V power supply module which are connected in sequence; the battery is a 24V rechargeable lithium battery pack, and the battery management module comprises a charging circuit and an overcurrent protection circuit.
The servo valve connector includes A, B, C, D, E, F and seven pins of PE.
The servo valve connector port enabling module comprises a servo valve connector port enabling circuit and an enabling indicating circuit, the servo valve connector port enabling circuit comprises a synchronous switch and a third resistor R03, the synchronous switch comprises 1-6 terminals, the 6 terminals are empty, the synchronous switch comprises two gears, the first gear is provided with a 1-terminal and a 3-terminal, the 4-terminal and the 6-terminal are communicated, the second gear is provided with a 1-terminal and a 2-terminal, the 4-terminal and the 5-terminal are communicated, and the enabling indicating circuit comprises a first resistor R01, a second resistor R02 and a second LED indicating lamp.
The output power supply switching module of the servo valve connector comprises a power supply switching circuit and a power supply switching indicating circuit, wherein the power supply switching circuit comprises a sliding switch, and the power supply switching indicating circuit comprises a first LED indicating lamp, a fourth resistor R04 and a fifth resistor R05; the sliding switch comprises pins 1 to 16, wherein pins 3, 7, 10 and 14 are empty, pins 1 and 16 are connected with a 24V power supply, pin 2 is connected with an A port of the servo valve connector, pin 4 is connected with a +15V power supply, pin 5, 9 and 13 are grounded, pin 6 is connected with a B port of the servo valve connector, pin 8 is connected with a-15V power supply, pin 11 is connected with a C port of the servo valve connector, pin 12 is connected with a terminal 1 of the synchronous switch, pin 15 is connected with one end of the third resistor R03, one end of the fourth resistor R04 and a terminal 4 of the synchronous switch, the other end of the third resistor R03 is connected with a terminal 2 of the synchronous switch, the other end of the fourth resistor R04 is simultaneously connected with one end of the fifth resistor R05 and an anode of the first LED indicator lamp, the other end of the fifth resistor R05 and a cathode of the first LED indicator lamp 7-2 are grounded, the 3 terminal of the synchronous switch is grounded, the 5 terminal of the synchronous switch is connected with one end of the second resistor R02, the other end of the second resistor R02 is connected with one end of the first resistor R01 and the anode of the second LED indicator light, and the other end of the first resistor R01 and the cathode of the second LED indicator light are grounded; the slide switch includes two grades, first grade: 2 feet and 1 feet, 6 feet and 5 feet, 11 feet and 12 feet, and 15 feet and 16 feet; a second gear: 2 feet and 4 feet, 6 feet and 8 feet, 11 feet and 9 feet, and 15 feet and 13 feet.
The maximum output power of a 24V to +/-15V power supply module in a hand-held portable servo valve tester and a testing method of the hand-held portable servo valve tester with the patent number CN201710468329.4 is 3.75W (+/-15V/250 mA), the maximum output power of a 24V to +/-15V adjustable power supply conversion module can reach 30W (+/-15V/2A), the testing requirement of a high-power servo valve is met, for example, the servo valve of German Schneider is mainly of a direct-acting structure, and the driving current is generally 300 mA.
Further, the 24V to ± 15V adjustable power conversion module comprises an output voltage adjusting module for adjusting output voltage, a switching frequency adjusting module for adjusting switching frequency, a slow start adjusting module for adjusting slow start time, an under-voltage locking threshold adjusting module for setting start voltage, a DC/DC conversion chip for voltage conversion, an input port for power input, a positive voltage output port for positive voltage output, a negative voltage output port for negative voltage output, a GND port for grounding, and a filtering module for stabilizing voltage; the output voltage adjusting module, the switching frequency adjusting module, the slow start adjusting module, the under-voltage locking threshold adjusting module, the input port, the positive voltage output port, the negative voltage output port and the GND port are respectively connected with the DC/DC conversion chip, and the output voltage adjusting module, the switching frequency adjusting module, the slow start adjusting module and the under-voltage locking threshold adjusting module respectively control the output voltage, the switching frequency, the slow start time and the start voltage of the DC/DC conversion chip; an over-temperature protection module and an over-current protection module are arranged in the DC/DC conversion chip; the input port is connected with a 24V power supply provided by the battery, and +15V voltage is output through the positive voltage output port and-15V voltage is output through the negative voltage output port.
Further, the 24V to +5V power supply module includes a third power conversion module a3, a sixteenth capacitor C16 and a seventeenth capacitor C17; the third power conversion module A3 is a power conversion chip LP2950, and its pin 1 is connected to one end of a seventeenth capacitor C17, the other end of the seventeenth capacitor C17 is grounded, the pin 2 of the third power conversion module A3 is grounded, the pin 3 of the third power conversion module A3 is connected to one end of a sixteenth capacitor C16, and the other end of the sixteenth capacitor C16 is connected to ground.
Further, the instruction signal generator includes a first analog operational amplifier U01, a second analog operational amplifier U02, a third analog operational amplifier U03, a fourth analog operational amplifier U04, a fifth analog operational amplifier U05, a sixth analog operational amplifier U06, a ninth analog operational amplifier U09, a tenth analog operational amplifier U10, an eleventh analog operational amplifier U11, a twelfth analog operational amplifier U12, a fourteenth analog operational amplifier U14, a fifteenth analog operational amplifier U15, and a sixteenth analog operational amplifier U16, and a first wave band switch SW1-a and a third wave band switch SW1-C, each of the first wave band switch SW1-a and the third wave band switch SW1-C including four gear positions.
Wherein: the second analog operational amplifier U02 and its peripheral circuits and the fifth analog operational amplifier U05 and its peripheral circuits constitute a command signal input circuit portion of the signal input output module, the second analog operational amplifier U02 and its surrounding circuits realize the signal zero setting function, specifically, the positive input end of the second analog operational amplifier U02 is connected with the resistance adjusting end of the first rheostat RP1, one end of the first varistor RP1 is connected to the +15V power supply through a thirteenth resistor R33, the other end of the first varistor RP1 is connected to a-15V supply through a thirty-six resistor R36, the inverting input end of the second analog operational amplifier U02 is connected with the output end thereof, and the output end of the second analog operational amplifier U02 is also connected with the output end of the fifth analog operational amplifier U05 through a fifteenth resistor R35 and an eighteenth resistor R18; the fifth analog operational amplifier U05 and its surrounding circuits can realize the functions of generating internal command signals and receiving external command signals, and specifically, the positive input end of the fifth analog operational amplifier U05 is connected to the resistance adjustment end of the sixth varistor RP6, one end of the sixth varistor RP6 is connected to the +15V power supply through the ninety resistor R90, and the other end of the sixth varistor RP6 is connected to the-15V power supply through the eighty-nineteenth resistor R89.
The first analog operational amplifier U01, the third analog operational amplifier U03, the fourth analog operational amplifier U04, the sixth analog operational amplifier U06, and the fourteenth analog operational amplifier U14 together with the respective surrounding circuits constitute a main circuit portion of the signal processing module.
The first analog operational amplifier U01 and its surrounding circuits are used for generating an internal bias voltage, specifically, a forward input end of the first analog operational amplifier U01 is connected to one end of a tenth capacitor C10 and a resistance adjustment end of a second rheostat RP2, the other end of the tenth capacitor RP6 is grounded, one end of the second rheostat RP2 is connected to a +15V power supply through a thirty-four resistor R34, the other end of the second rheostat RP2 is connected to a-15V power supply through a thirty-seven resistor R37, an inverting input end of the first analog operational amplifier U01 is connected to an output end, and the output end of the first analog operational amplifier U01 is further connected to the output end of the fourth analog operational amplifier U04 through a thirty-nine resistor R39 and a forty resistor R40.
The third analog operational amplifier U03, the fourth analog operational amplifier U04, the sixth analog operational amplifier U06, the fourteenth analog operational amplifier U14 and the circuits around the third analog operational amplifier U03 are used for amplifying signals in proportion, specifically, a forward input end of the third analog operational amplifier U03 is grounded through a sixteenth resistor R16, an inverting input end of the third analog operational amplifier U03 is connected with an output end of the fifth analog operational amplifier U05 through the eighteenth resistor R18, an output end of the second analog operational amplifier U02 is connected through the thirty-fifth resistor R35, an output end of the third analog operational amplifier U03 is connected through a seventeenth resistor R17 and a fourth varistor RP4, and a resistance adjusting end of the fourth varistor RP4 is connected with the output end of the third analog operational amplifier U03; the forward input end of the fourth analog operational amplifier U04 is grounded through a fifteenth resistor R15, the reverse input end of the fourth analog operational amplifier U04 is connected to the output end of the third analog operational amplifier U03 through a fourteenth resistor R14, the self output end is connected through a thirteenth resistor R13 and a third resistor RP3, the resistance adjusting end of the third resistor RP3 is connected to the output end of the fourth analog operational amplifier U04, the reverse input end of the sixth analog operational amplifier U06 is connected to the output end of the fourth analog operational amplifier U04 through a forty-th resistor R40, the output end of the first analog operational amplifier U01 is connected through a thirty-ninth resistor R39, the forward input end of the sixth analog operational amplifier U06 is grounded through a thirty-eighteenth resistor R38, the reverse input end of the sixth analog operational amplifier U06 is further connected to the self output end through a fourth eleventh resistor R41, the reverse input end of the fourteenth analog operational amplifier U14 is connected with the output end of the third analog operational amplifier U03 through a fifty-eighth resistor R58 and is connected with the output end of the fourteenth analog operational amplifier U44 through a forty-fourth resistor R44, and the positive input end of the fourteenth analog operational amplifier U14 is grounded through a forty-third resistor R43.
The ninth analog operational amplifier U09, the tenth analog operational amplifier U10, the eleventh analog operational amplifier U11, the twelfth analog operational amplifier U12, the fifteenth analog operational amplifier U15, their respective peripheral circuits, and the first band switch SW1-a together constitute a main circuit of the constant current module, so as to realize a function of generating a stable current output signal through PI control, specifically: the 2-gear terminal of the first band switch SW1-A is connected with the output terminal of the sixth analog operational amplifier U06, the 3-and 4-gear terminals of the first band switch SW1-A are connected with the output terminal of the third analog operational amplifier U03, and the 1-gear port of the SW1-A of the first band switch is empty; the gear selection end of the first band switch SW1-a is connected with one end of a fourteenth capacitor C14 and one end of a forty-seventh resistor R47, the other end of the fourteenth capacitor C14 and the forty-seventh resistor R47 are grounded, the gear selection end of the first band switch SW1-a is connected with the reverse input end of the ninth analog operational amplifier U09 through a fifty-fifth resistor R50, the reverse input end of the ninth analog operational amplifier U09 is further connected with the output end of the ninth analog operational amplifier U09 through a fifteenth capacitor C50, the reverse input end of the ninth analog operational amplifier U09 is further connected with the output end of the fifteenth analog operational amplifier U15 through a forty-nineteenth resistor R49, the input end of the ninth analog operational amplifier U09 is grounded in the positive direction, the reverse input end of the fifteenth analog operational amplifier U15 is connected with the output end of the fifteenth analog operational amplifier U09 through a twenty-eighteenth resistor R28 and a fifth resistor RP5, the resistance adjusting terminal C of the fifth rheostat RP5 is connected to the output terminal of the fifteenth analog operational amplifier U15, the inverting input terminal of the fifteenth analog operational amplifier U15 is further connected to one terminal of a first capacitor C01 through a twelfth resistor R12, the other terminal of the first capacitor C01 is grounded, the forward input terminal of the fifteenth analog operational amplifier U15 is grounded through a twenty-fifth resistor R25, the forward input terminal of the fifteenth analog operational amplifier U15 is further connected to the output terminal of the ninth analog operational amplifier U09 through a twenty-sixth resistor R26 and a thirty-second resistor R32, the output terminal of the ninth analog operational amplifier U09 is connected to the input terminal of the tenth analog operational amplifier U10 through a thirty-first resistor R31, is connected to the input terminal of the eleventh analog operational amplifier U11 through a thirty-second resistor R30, and is connected to the forward input terminal of the twelfth analog operational amplifier U12 through a twenty-ninth resistor R29, the tenth analog operational amplifier U10, the eleventh analog operational amplifier U11, and the twelfth analog operational amplifier U12 have respective inverting input terminals connected to their own output terminals, the tenth analog operational amplifier U10 is connected to one end of the thirty-second resistor R32 through a forty-sixth resistor R46, the eleventh analog operational amplifier U11 through a forty-fifteenth resistor R45, and the twelfth analog operational amplifier U12 is connected to one end of the thirty-seventh resistor R27, and the other end of the thirty-second resistor R32 is connected to an output terminal of the ninth analog operational amplifier U09.
The third band switch SW1-C, the sixty-third resistor R63 to the sixty-fifth resistor R65, and the eighty-sixth resistor R86 to the eighty-eighth resistor R88 constitute a main circuit portion of the signal switching module, so as to realize a function of selecting different types of command signals, specifically, a gear selection end of the third band switch SW1-C is connected with a non-ground end of the first capacitor C01 and is a signal output end, the 1, 2, 3 and 4 gear positions of the third band switch SW1-C are used for selecting different signal outputs, the sixty-third resistor R63 and the eighty-sixth resistor R86 are connected in parallel to form a first branch, one end of the first branch is connected with the 4-gear end of the third band switch SW1-C, the other end of the first branch is connected with one end, away from the output end of the ninth analog operational amplifier U09, of the thirty-second resistor R32; the sixty-fourth resistor R64 and the eighty-seventh resistor R87 are connected in parallel to form a second branch, one end of the second branch is connected with the 3-gear end of the third band switch SW1-C, and the other end of the second branch is connected with one end, far away from the output end of the ninth analog operational amplifier U09, of the thirty-second resistor R32; the sixty-fifth resistor R65 and the eighty-eighth resistor R88 are connected in parallel to form a third branch, one end of the third branch is connected with the 2-gear end of the third band switch SW1-C, and the other end of the third branch is connected with one end, far away from the output end of the ninth analog operational amplifier U09, of the thirty-second resistor R32; the 1 st gear terminal of the third band switch SW1-C is connected to the output terminal of the fourteenth analog operational amplifier U14.
Further, the DC/DC conversion chip includes a first DC/DC conversion chip a1 for outputting +15V and a second DC/DC conversion chip a2 for outputting-15V voltage, the first DC/DC conversion chip a1 has a first over-temperature protection module and a first over-current protection module built therein, the second DC/DC conversion chip a2 has a second over-temperature protection module and a second over-current protection module built therein, the first DC/DC conversion chip a1 and the second DC/DC conversion chip a2 are independent of each other and share the GND port and the input port, the first DC/DC conversion chip a1 employs an LMZ35003 voltage conversion chip, and the second DC/DC conversion chip a2 employs an LMZ34002 voltage conversion chip.
Further, operating condition indicating module is including setting up tester switch on the hand-held type shell, connecting power module's the interface that charges, pilot lamp and connection the heavy current indicating circuit, battery voltage indicating circuit and the positive and negative indicating circuit of current-voltage of pilot lamp, the pilot lamp includes third LED pilot lamp, fourth LED pilot lamp and fifth LED pilot lamp.
Wherein: the high-current indicating circuit comprises a thirteenth analog operational amplifier U13, a forty-second resistor R42, a fifty-second resistor R52 to a fifty-fifth resistor R55, a fifty-seventh resistor R57, a third diode D03, a fourth diode D04 and a thirteenth capacitor C13, wherein the forward input end of the thirteenth analog operational amplifier U13 is grounded through the forty-second resistor R42, the reverse input end of the thirteenth analog operational amplifier U13 is respectively connected with one end of the fifty-fifth resistor R55 and one end of the fifty-fourth resistor R54, the other end of the fifty-fifth resistor R55 is connected with an Ibatt fifty test jack of the spool test module, the other end of the fifty-fourth resistor R54 is respectively connected with one ends of the fifty-second resistor R52 and the third resistor R53, the other end of the second resistor R52 is connected with a +15V power supply, and the other end of the fifty-fifth resistor R53 is grounded, the reverse input end of the thirteenth analog operational amplifier U13 is further connected to its own output end through the thirteenth capacitor C13, the output end of the thirteenth analog operational amplifier U13 is further connected to the reverse input end of the thirteenth analog operational amplifier C13 through the cathode of the third diode D03, the anode of the third diode D03, the anode of the fourth diode D04 and the cathode of the fourth diode D04 in sequence, one end of the fifty-seventh resistor R57 is connected to the output end of the thirteenth analog operational amplifier C13, the other end of the fifty-seventh resistor R57 is connected to the anode of the third LED indicator, and the other end of the third LED indicator is grounded.
The battery voltage indicating circuit comprises an eighth analog operational amplifier U08, a sixth resistor R06 to an eleventh resistor R11, a twenty-first resistor R21, a fifty-first resistor R51, a first diode D01, a second diode D02 and a second capacitor C02, wherein a forward input end of the eighth analog operational amplifier U08 is grounded through the twenty-first resistor R21, a reverse input end of the eighth analog operational amplifier U08 is respectively connected with one end of the sixth resistor R06 and one end of the seventh resistor R07, the other end of the sixth resistor R06 is respectively connected with one end of the eighth resistor R08 and one end of the ninth resistor R09, the other end of the eighth resistor R08 is grounded, the other end of the ninth resistor R09 is connected with a +24V power supply, the other end of the seventh resistor R07 is respectively connected with one end of the tenth resistor R10 and one end of the eleventh resistor R11, and the other ends of the tenth resistor R10-3615V power supply, the other end of the eleventh resistor R11 is grounded, the output end of the eighth analog operational amplifier U08 is connected to the reverse input end of the eighth analog operational amplifier U08 through the second capacitor C02, the output end of the eighth analog operational amplifier U08 is further connected to the reverse input end of the eighth analog operational amplifier U08 through the cathode of the first diode D01, the anode of the first diode D01, the anode of the second diode D02 and the cathode of the second diode D02 in sequence, one end of the fifty-first resistor R51 is connected to the output end of the eighth analog operational amplifier U08, the other end of the fifty-first resistor R51 is connected to one end indicated by the fourth LED, the other end indicated by the fourth LED is grounded, and the fourth LED comprises two LED indicator lamps connected in reverse parallel.
The current and voltage positive and negative indication circuit comprises a sixteenth analog operational amplifier U16, a twenty-second resistor R22 to a twenty-fourth resistor R24, a forty-eighth resistor R48, a fifty-sixth resistor R56, a sixty-first resistor R61 and a sixty-second resistor R62, wherein the forward input end of the sixteenth analog operational amplifier U16 is grounded through the twenty-fourth resistor R24, the reverse input end of the sixteenth analog operational amplifier U16 is connected with the output end of the fifteenth analog operational amplifier U15 through the twenty-third resistor R23, the reverse input end of the sixteenth analog operational amplifier U16 is further connected with the output end of the sixteenth analog operational amplifier U16 through a second twelfth resistor R22, the output end of the sixteenth analog operational amplifier U16 is further connected with one end of the fifth LED indicator light through the sixth resistor R56, and the other end of the fifth LED indicator light is grounded, the fifth LED indicator lamp comprises two LED indicator lamps which are connected in parallel in the same direction, the two LED indicator lamps are respectively connected with the sixty-first resistor R61 and the sixty-second resistor R62 in parallel, and the fifth LED indicator lamp is further connected with the output end of the fifteenth analog operational amplifier U15 through the forty-eighth resistor R48.
Further, the output voltage regulation module includes a positive voltage regulation module and a negative voltage regulation module, wherein: the positive voltage regulating module is used for regulating the output voltage of the first DC/DC conversion chip A1 and comprises a ninety-fourth resistor R94, wherein a pin 36 of the first DC/DC conversion chip A1 is connected with one end of the ninety-fourth resistor R94, the other end of the ninety-fourth resistor R94 is connected with a pin 10 of the first DC/DC conversion chip A1, and pins 10 to 15 and 39 of the first DC/DC conversion chip A1 are connected with the positive voltage output port; the negative voltage adjusting module is used for adjusting the output voltage of the second DC/DC conversion chip a2, and includes a ninety third resistor R93, the pin 36 of the second DC/DC conversion chip a2 is connected to one end of the ninety third resistor R93, the other end of the ninety third resistor R93 is connected to the GND port, and the pins 1, 4, 5, 8, 9, 16 to 20, 29, 30, 32 to 34, 37, 40 of the second DC/DC conversion chip a2 are connected to the negative voltage output port.
Further, the ninety-fourth resistors R94 and R94 of the output voltage adjusting module are set with reference to equation 1 and equation 2 according to the output voltage being ± 15VThe ninety third resistor R93 has a resistance of 178K, where VOUT1Is the output voltage, V, of the first DC/DC converter chip A1OUT2Is the output voltage of the second DC/DC conversion chip a2.
Figure BDA0001870418280000081
Figure BDA0001870418280000082
Further, the switching frequency adjustment module includes a positive power switching frequency adjustment module and a negative power switching frequency adjustment module, wherein: the positive power switching frequency adjusting module is used for setting the switching frequency of the first DC/DC conversion chip A1, and comprises a ninety-fifth resistor R95, wherein a pin 31 of the first DC/DC conversion chip A1 is connected with one end of the ninety-fifth resistor R95, and the other end of the ninety-fifth resistor R95 and a pin 29 of the first DC/DC conversion chip A1 are connected with the GND port; the negative power switching frequency adjusting module is used for setting the switching frequency of the second DC/DC conversion chip A2 and comprises a ninety-eight resistor R98, wherein a pin 30 of the second DC/DC conversion chip A2 is connected with one end of the ninety-eight resistor R98, and the other end of the ninety-eight resistor R98 is connected with a pin 9 of the second DC/DC conversion chip A2.
Further, the slow-start regulating module comprises a positive power supply slow-start regulating module and a negative power supply slow-start regulating module, wherein: the positive power supply slow-start regulating module is used for setting the slow start time of the first DC/DC conversion chip A1 and comprises a twenty-fourth capacitor C24, wherein a pin 28 of the first DC/DC conversion chip A1 is connected with one end of the twenty-fourth capacitor C24, and the other end of the twenty-fourth capacitor C24 is connected with the GND port; the negative power supply slow-start adjusting module is used for setting the slow start time of the second DC/DC conversion chip a2, and includes a twenty-second capacitor C22, a pin 28 of the second DC/DC conversion chip a2 is connected to one end of the twenty-second capacitor C22, and the other end of the twenty-second capacitor C22 is connected to a pin 37 of the second DC/DC conversion chip a2.
Further, the under-voltage locking threshold adjusting module comprises a positive power supply under-voltage locking threshold adjusting module and a negative power supply under-voltage locking threshold adjusting module.
Wherein: the positive power supply under-voltage locking threshold value adjusting module is used for setting the starting voltage of the first DC/DC conversion chip A1, and comprises a ninety-sixth resistor R96 and a ninety-seventh resistor R97, wherein a pin 26 of the first DC/DC conversion chip A1 is connected with one end of the ninety-sixth resistor R96, the other end of the ninety-sixth resistor R96 and one end of the ninety-seventh resistor R97 are connected with a pin 27 of the first DC/DC conversion chip A1, and the other end of the ninety-seventh resistor R97 is connected with the GND port.
The negative power supply under-voltage locking threshold value adjusting module is used for setting the starting voltage of the second DC/DC conversion chip A2 and comprises a ninety first resistor R91 and a ninety second resistor R92, one end of the ninety first resistor R91 is connected with a pin 26 of the second DC/DC conversion chip A2, the other end of the ninety first resistor R91 and one end of the ninety second resistor R92 are connected with a pin 27 of the second DC/DC conversion chip A2, and the other end of the ninety second resistor R92 is connected with a pin 29 of the second DC/DC conversion chip A2.
Further, a general start voltage is set to 80% of an input voltage, the start voltages of the first and second DC/DC converting chips a1 and a2 are both set to 20V, the resistances of the ninety seventh resistor R97 and the ninety second resistor R92 of the under-voltage locking threshold adjusting module are set according to the start voltages, the resistances of the ninety seventh resistor R97 and the ninety second resistor R92 are both set to 11.5K with reference to equation 3 and equation 4, wherein V is set to be 80VON1Is the starting voltage, V, of the first DC/DC converter chip A1ON2Is the starting voltage of the second DC/DC conversion chip a2.
Figure BDA0001870418280000091
Figure BDA0001870418280000092
Further, the filtering modules include a first filtering module for input power filtering of the first DC/DC converting chip a1, a second filtering module for input power filtering of the second DC/DC converting chip a2, a third filtering module for output power filtering of the first DC/DC converting chip a1, and a fourth filtering module for output power filtering of the second DC/DC converting chip a2, wherein: the first filtering module comprises a twentieth capacitor C20, one end of the twentieth capacitor C20 is connected to the 26 pin of the first DC/DC conversion chip A1, and the other end of the twentieth capacitor C20 is connected to the GND port; the second filtering module comprises an eighteenth capacitor C18, one end of the eighteenth capacitor C18 is connected to the 26 pin of the second DC/DC conversion chip A2, and the other end of the eighteenth capacitor C18 is connected to the GND port; the third filtering module comprises a twenty-third capacitor C23, the twenty-third capacitor C23 is an electrolytic capacitor, the positive electrode of the twenty-third capacitor C23 is connected with the positive voltage output port, and the negative electrode of the twenty-third capacitor C23 is connected with the GND port; the fourth filtering module comprises a twenty-first capacitor C21, the twenty-first capacitor C21 is an electrolytic capacitor, the negative electrode of the twenty-first capacitor C21 is connected to the negative voltage output port, and the positive electrode of the twenty-first capacitor C21 is connected to the GND port.
Further, the signal acquisition display module includes digital voltmeter and voltage acquisition circuit, wherein: the voltage acquisition circuit comprises sixty-sixth resistors R66-eighty-fifth resistors R85 and a second wave band switch SW1-B, the second wave band switch SW1-B comprises four gears, the second wave band switch SW1-B, the first wave band switch SW1-A and the third wave band switch SW1-C jointly form the wave band switch, voltage values of corresponding points are acquired through the voltage acquisition circuit and displayed on the digital voltmeter, when the current value of a current gear needs to be displayed, the acquired voltage values are converted into current values according to the relation between the voltage of the acquired points in the circuit and output current and displayed on the digital voltmeter, an output port of the sixteenth analog operational amplifier U16 is sequentially connected with sixty-sixth resistors R66-seventy resistors R70 and eighty-first resistors R81-seventy resistors R77 in series and then is grounded, the 4 th position terminal of the second band switch SW1-B is connected between the seventeenth resistor R70 and the eighty-first resistor R81, the 3 rd position terminal of the second band switch SW1-B is connected between the seventy-eighth resistor R78 and the seventy-ninth resistor R79, the 2 nd position terminal of the second band switch SW1-B is connected between the seventy-eighth resistor R78 and the seventy-seventh resistor R77, the 1 st position terminal of the second band switch SW1-B is grounded through a seventeenth resistor R76, the 1 st gear end of the second band switch SW1-B is also connected in series with a seventy-fifth resistor R75 to a seventy-first resistor R71 and an eighty-second resistor R82 to an eighty-fifth resistor R85 in turn and then connected with the output end of the fourteenth analog operational amplifier U14, the gear selection port of the second band switch SW1-B is connected with the digital voltmeter; the output ends of the fourteenth analog operational amplifier U14 and the sixteenth analog operational amplifier U16 are voltage collecting points, the voltage collected from the output end of the fourteenth analog operational amplifier U14 is used for displaying the value of the output voltage, and the voltage collected from the output end of the sixteenth analog operational amplifier U16 is used for displaying the value of the output current.
The invention also provides a test method using the hand-held portable servo valve tester, which is characterized by comprising the following steps:
(1) according to the type of the tested servo valve, selecting to connect the tested servo valve with a handheld portable servo valve tester through the servo valve connector or the valve core testing module;
(2) when a servo valve is tested through the servo valve connector, controlling enabling or disabling of the servo valve connector port through the synchronous switch of the servo valve connector port enabling module according to parameters of the tested servo valve; switching to a power supply matched with the servo valve to be tested through the sliding switch of the servo valve connector output power supply switching module;
(3) adjusting to a required instruction signal range through the waveband switch of the signal switching module;
(4) adjusting the potentiometer of the signal switching module to select a proper signal so as to correspondingly test the servo valve to be tested;
(5) in the test, the numerical value displayed by the signal acquisition and display module, the signal parameter adjusted by the potentiometer of the signal switching module, the F test jack of the valve core test module connected with the tested servo valve or the F terminal feedback signal of the servo valve connector connected with the tested servo valve are judged, and then the analysis is carried out according to whether the load action of the tested servo valve can be reflected therewith, so that the performance of the tested servo valve is summarized and the fault is searched.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with a handheld portable servo valve tester and a testing method of the patent No. CN201710468329.4, the servo valve tester provided by the invention is additionally provided with a servo valve connector output power supply switching module and a servo valve connector port enabling module, can control enabling and disabling of signals output by the servo valve connector, can switch power supplies output by the servo valve connector, and can meet testing requirements of servo valves of more types;
2. compared with a handheld portable servo valve tester and a testing method of the patent No. CN201710468329.4, the shell and the connecting cable of the servo valve tester of the invention both adopt fireproof flame-retardant materials, and have higher safety;
3. compared with a 24V to +/-15V power supply module in a handheld portable servo valve tester and a testing method of the patent number CN201710468329.4, the maximum output power of a 24V to +/-15V adjustable power supply conversion module in the servo valve tester is improved to 30W (+/-15V/2A) from 3.75W +/-15V/250 mA; the output voltage of a 24V to +/-15V power supply module in the hand-held portable servo valve tester and the test method of the patent No. CN201710468329.4 is +/-15V theoretically, but actually has a certain deviation, the output voltage of the 24V to +/-15V adjustable power supply conversion module is adjustable, and can be accurately adjusted to +/-15V by adjusting the resistance value of the output voltage adjusting module, so that the output of a servo valve is more accurate; the 24V-to- +/-15V adjustable power supply conversion module in the servo valve tester can set switching frequency, slow start time and start voltage, so that the output of the servo valve tester is more stable; the battery capacity is improved to 3000 mA/h; therefore, the servo valve tester can meet the test requirements of more high-power and high-precision servo valves, for example, the servo valve of German Schneider is mainly of a direct-acting structure, and the driving current is generally 300 mA.
3. In a hand-held portable servo valve tester and a test method of the patent No. CN201710468329.4, an output signal is measured by adopting a method that a direct current voltmeter is connected with an output port in series, when a valve core test module is used for testing a servo valve, misoperation occurs, such as wrong wire connection, and the direct current ammeter is likely to be burnt out.
5. The valve core test module of the hand-held portable servo valve tester and the test method thereof with the patent number CN201710468329.4 is provided with a plurality of test jacks such as I A, I/V, PE, F, D and the like, and is mainly used for testing the servo valve.
6. The constant current source module in the hand-held portable servo valve tester and the testing method of the patent No. CN201710468329.4 outputs current signals through a high-voltage large-current operational amplifier OPA551 chip, the maximum output current of the high-voltage large-current operational amplifier OPA551 chip is 60mA, the +/-50 mA chip which is output for a long time is easy to heat, so that the output current is unstable.
7. The handheld portable servo valve tester has efficient DC/DC conversion, realizes high-precision, multi-range and high-stability current or voltage output through the multi-stage closed-loop control circuit, can realize free I/V switching, can provide three power signals and four different instruction signals for a tested servo valve, can switch and combine the power signals to meet the requirements of more servo valves, determines the motion position of a valve core by monitoring the position output signal of the valve core, is simple to debug and maintain, can control the servo valve, a proportional valve and a common reversing valve, can collect the position feedback signal of the valve core of an electric feedback servo valve, can perform fault judgment and performance test on more than 90% of hydraulic control valves in the current market, and has strong universality.
8. According to the handheld portable servo valve tester, all circuits are integrated on one circuit board and are connected with the shell in a seamless mode, the integration level is high, the integrity is strong, the handheld portable servo valve tester can be held by one hand, and a good man-machine interaction effect is achieved.
Drawings
FIG. 1 is a schematic diagram of the connection of a servo valve connector according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a connection of a servo valve connector output power switching module and a servo valve connector port enabling module in accordance with an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention;
FIG. 4 is a block diagram of a system according to an embodiment of the present invention;
FIG. 5 is a core signal flow diagram of a command signal generator according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a 24V to + -15V adjustable power conversion module according to an embodiment of the present invention;
fig. 7 is a schematic system structure diagram of a 24V to ± 15V adjustable power conversion module according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a 24V to +5V power conversion circuit according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a high current indicating circuit according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a battery voltage indicating circuit according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of a circuit of the command signal generator and a current-voltage positive-negative indicating circuit according to an embodiment of the present invention;
FIG. 12 is a schematic circuit diagram of a signal acquisition display module according to an embodiment of the present invention;
the reference numbers in the figures illustrate:
FIG. 1: A. a servo valve connector A port; B. a servo valve connector B port; C. a servo valve connector port C; D. a servo valve connector D port; E. a servo valve connector E port; F. a servo valve connector F port; 5. a command signal generator; 6, a power supply module; 7-1, a slide switch; 8-1, a synchronous switch; r03. a third resistor; r19. nineteenth resistor; r20. twentieth resistor;
FIG. 2: 7-1, a slide switch; 8-1, a synchronous switch; 7-2. a first LED indicator light; 8-2. a second LED indicator light; r01, a first resistor; r02. second resistance; r03. a third resistor; r04. fourth resistance; r05. fifth resistor;
FIG. 3: 1. a servo valve connector; 2-1, a first valve core testing module; 2-2. a second valve core testing module; 3-1, a digital voltmeter; 4. a working state indicating module; 4-1, a tester switch; 4-2. indicator light; 4-2-1. a third LED indicator light; 4-2-2. a fourth LED indicator light; 4-2-3. a fifth LED indicator light; 4-3, a charging interface; 5. a command signal generator; 5-4-1. a wave band switch; 5-4-2, a potentiometer; 6. a power supply module; 7. the servo valve connector outputs a power supply switching module; 7-1, a slide switch; 7-2. a first LED indicator light; 8. a servo valve connector port enabling module; 8-1, a synchronous switch; 8-2. a second LED indicator light; 9. a hand-held housing; C. d, E, F, PE, 24V/2A, +15V, -15V, GND, +5V, Ibatt, ± 10V.
FIG. 4: 1. a servo valve connector; 2. a valve core testing module; 2-1, a first valve core testing module; 2-2. a second valve core testing module; 3. a signal acquisition display module; 3-1, a digital voltmeter; 3-2, a voltage acquisition circuit; 4. a working state indicating module; 4-1, a tester switch; 4-2. indicator light; 4-3, a charging interface; 4-4. a high current indicating circuit; 4-5. a battery voltage indicating circuit; 4-6, a current and voltage positive and negative indication circuit; 5. a command signal generator; 5-1, a signal input and output module; 5-2, a signal processing module; 5-3 constant current source module; 5-4, a signal switching module; 6. a power supply module; the adjustable power supply conversion module is used for converting 6-1.24V into +/-15V; 6-1-2, outputting a voltage regulation module; 6-1-3, an under-voltage locking threshold value adjusting module; 6-1-4, a switching frequency adjusting module; 6-1-5, slowly starting the adjusting module; 6-1-6. input port; 6-1-7, positive voltage output port; 6-1-8, negative voltage output port; 6-1-9.GND port; 6-1-10. a DC/DC conversion chip; 6-1-11, a filtering module; 6-2. a battery; 6-3, a battery management module; a 6-4.24V to +5V power supply module; 7. the servo valve connector outputs a power supply switching module; 8. a servo valve connector port enabling module;
FIG. 6A 1. first DC/DC converter chip; A2. a second DC/DC conversion chip; r91. a ninety first resistance; r92. a ninety second resistance; r93. a ninety-third resistor; r94. the ninety-fourth resistor; r95. ninety-fifth resistance; r96. a ninety-sixth resistance; r97. ninety seventh resistor; C18. an eighteenth capacitor; C19. an eighteenth capacitor; C20. a twentieth capacitance; C21. a twenty-first capacitor; C22. a twenty-second capacitor; C23. a twenty-third capacitance; C24. a twenty-fourth capacitor;
FIG. 7: 6-1. PCB board; 6-1-2, outputting a voltage regulation module; 6-1-2-1. a positive voltage regulation module; 6-1-2-2 negative voltage regulation module; 6-1-3, an under-voltage locking threshold value adjusting module; 6-1-3-1, a positive power supply under-voltage locking threshold value adjusting module; 6-1-3-2, a negative power supply under-voltage locking threshold value adjusting module; 6-1-4, a switching frequency adjusting module; 6-1-4-1, a positive power switching frequency adjusting module; 6-1-4-2, a negative power supply switching frequency adjusting module; 6-1-5, slowly starting the adjusting module; 6-1-5-1. a positive power supply slow start adjusting module; 6-1-5-2. a negative power supply slow start adjusting module; 6-1-6. input port; 6-1-7, positive voltage output port; 6-1-8, negative voltage output port; 6-1-9-1. a first GND port; 6-1-9-2. a second GND port; 6-1-10. a DC/DC conversion chip; 6-1-11, a filtering module; 6-1-11-1. a first filtering module; 6-1-11-2. a second filtering module; 6-1-11-3. a third filtering module; 6-1-11-4. a fourth filtering module; 7-11-1. a first over-temperature protection module; 7-11-2. a second over-temperature protection module; 7-12-1. a first overcurrent protection module; 7-12-2. a second overcurrent protection module;
FIG. 8: A3. a third power conversion module; C16. a sixteenth capacitor; C17. a seventeenth capacitor;
FIG. 9: 4-2-1. a third LED indicator light; r42. forty-second resistance; r52. fifty-second resistance; r53. fifty-third resistance; r54. fifty-fourth resistance; r55. fifty-fifth resistance; r57. fifty-seventh resistor; D03. a third diode; D04. a fourth diode; u13. a thirteenth analog operational amplifier; ibatt, valve core testing module Ibatt testing hole;
FIG. 10: 4-2-2. a fourth LED indicator light; r06. sixth resistance; r07. seventh resistor; r08. eighth resistor; r09. ninth resistor; r10, tenth resistance; r11. eleventh resistor; r21. twenty-first resistance; r51, fifty-first resistance; u08. an eighth analog operational amplifier; D01. a first diode; D02. a second diode;
FIG. 11: U01-U06. first to sixth analog operational amplifiers; U09-U12. ninth to twelfth analog operational amplifiers; U14-U16 fourteenth to sixteenth analog operational amplifiers; R12-R18 twelfth to eighteenth resistors; R22-R41 twenty-second to forty-first resistors; R43-R50. forty-third to fifty-fifth resistances; r56. fifty-sixth resistance; r58, fifty-eighth resistance; R61-R65 sixty-one to sixty-five resistors; R86-R90 eighty-sixth to ninety resistors; SW1-a. first band switch; SW1-b. second band switch; SW1-c. third band switch; RP1-rp6 first to sixth varistors; C01. a first capacitor; C10. a tenth capacitance; C14. a fourteenth capacitance; C15. a fifteenth capacitor; 4-2-3. a fifth LED indicator light;
FIG. 12: R66-R85 sixty-sixth to eighty-fifth resistors; SW1-b. second band switch; 3-1, a digital voltmeter; u16. a sixteenth analog operational amplifier; u14. a fourteenth analog operational amplifier.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 3 and 4, a hand-held portable servo valve tester comprises a hand-held housing 9, a servo valve connector 1 arranged on the hand-held housing 9, a power supply module 6 arranged in the hand-held housing 9, a command signal generator 5, a valve core testing module 2, a signal acquisition and display module 3, a servo valve connector port enabling module 8, a servo valve connector output power supply switching module 7 and a working state indicating module 4; the valve core testing module 2 is internally provided with a first valve core testing module 2-1 and a second valve core testing module 2-2, the first valve core testing module 2-1 comprises C, D, E, F, PE, 24V/2A, GND, +15V and-15V discrete testing jacks, the second valve core testing module 2-2 comprises +5V, GND, Ibatt and +/-10V discrete testing jacks, and each testing jack of the valve core testing module 2 and each connecting terminal of the servo valve connector 1 are respectively connected with a corresponding end of the command signal generator 5; the instruction signal generator 5 comprises a signal input and output module 5-1, a signal processing module 5-2, a constant current source module 5-3 and a signal switching module 5-4, wherein the signal processing module 5-2, the constant current source module 5-3 and the signal switching module 5-4 are respectively connected with the signal input and output module 5-1; the power module 6 is respectively connected with the instruction signal generator 5, the signal acquisition and display module 3, the signal input and output module 5-1, the servo valve connector port enabling module 8, the servo valve connector output power switching module 7 and the working state indicating module 4, and supplies power to the connected tested servo valve through the valve core testing module 2 and the servo valve connector 1.
As shown in fig. 3, the hand-held casing 9 is made of PA66 plastic, is light in weight, has fireproof and flame-retardant effects, and mainly comprises an upper cover and a lower bottom, wherein a sealing groove is arranged at the joint of the upper cover and the lower bottom, and a silicone rubber sealing ring is arranged in the sealing groove, so that oil stains on the overhaul site can be prevented.
The parts of the upper cover of the handheld shell 9, which correspond to the installation positions of the valve core testing module 2, the signal acquisition and display module 3, the working state indicating module 4, the signal switching module 5-4, the servo valve connector port enabling module 8 and the servo valve connector output power switching module 7, are testing panels, the signal switching module 5-4 comprises a band switch 5-4-1 and a potentiometer 5-4-2, rubber gaskets are additionally arranged at the positions of the band switch 5-4-1 and the potentiometer 5-4-2, which are contacted with the testing panels, so that the handheld shell has a slight shockproof function and can be independently operated by a single person in a complex environment; the part of the hand-held housing 9 where the power module 6 is mounted is a hand-held part.
As shown in fig. 4, the power module 6 includes a battery 6-2, a battery management module 6-3, a 24V to ± 15V adjustable power conversion module 6-1, and a 24V to +5V power module 6-4, which are connected in sequence; the battery 6-2 is a 24V 3000mA/h rechargeable battery pack consisting of six rechargeable lithium batteries, the battery management module 6-3 comprises a charging circuit and an overcurrent protection circuit, the battery management module 6 comprises a charging circuit and an overcurrent protection circuit, and a tester is provided with a national standard constant current charger when leaving a factory.
The signal switching module 5-4 comprises a wave band switch 5-4-1 and a potentiometer 5-4-2, the wave band switch 5-4-1 is a three-pole four-gear wave band switch, different signals capable of being switched comprise four instruction signals of-10V- +10V, +4 mA- +20mA, -10 mA- +10mA and-50 mA- +50mA, and control current or voltage signals required by various servo valves are adjusted in time through different gears to meet the signal specification of common servo valves. And the instruction signals can be displayed on a digital voltmeter 3-1 of the signal acquisition and display module 3. The potentiometer 5-4-2 has a fine adjustment function and is used for being matched with the signal adjustment of the band switch 5-4-1. The signal processing module 5-2 adopts a PI controller, and adopts a plurality of operational amplifiers to process and proportionally control signals to generate stable current output signals.
The servo valve connector 1 comprises A, B, C, D, E, F and seven pins of PE.
The servo valve connector port enabling module 8 can be used for enabling or disabling the C port of the servo valve connector 1, and the servo valve connector output power switching module 7 can be used for switching the power supply connected with the servo valve connector 1, so that the same servo valve connector 1 can output different power supplies.
In this embodiment, the servo valve connector 1 is a seven-core aviation socket structure, seven interface pins of the connector are defined as a to F and PE in fig. 1, and can provide a 24V DC power supply mode and a ± 15V DC power supply mode, and a C port can be enabled or disabled according to the model of a specific tested servo valve; for the non-electric feedback type servo valve coil type, the instruction can be directly given to the coil, so the tester of the invention is also provided with the valve core testing module 2 to realize two external interface modes for supplying power and providing instruction signals for the tested servo valve. Specifically, one is to connect a tester with a corresponding model of a tested servo valve through the servo valve connector 1, the servo valve connector 1 comprises two seven-core aviation plugs and a connecting cable, wherein one aviation plug is, for example, a seven-core aviation plug connection tester with a standard configuration of 2M, and the other aviation plug is, for example, a standard XS12K7P seven-core aviation plug connection servo valve with a mounting diameter of about 12mm, and signals and power are transmitted through the connecting cable, and the diameters of the two aviation plugs are inconsistent, so that misplug can be effectively prevented; the connecting cable adopts RVSP twisted-pair shielded wire, has strong anti-interference capability and has fireproof and flame-retardant effects. Another method for connecting a tester and a corresponding model of servo valve to be tested by a pin lead of the valve core test module 2 includes a first valve core test module 2-1 and a second valve core test module 2-2, where the first valve core test module 2-1 is provided with C, D, E, F, PE, 24V/2A, +15V, -15V, GND discrete test sockets, the second valve core test module 2-2 is provided with +5V, Ibatt, +10V, GND discrete test sockets, and the test sockets are connected to a corresponding internal circuit, and are located on a tester panel of the handheld housing 9, where an Ibatt test socket is a power consumption test port of the inserted servo valve to be tested, and the voltage of the test socket can be measured by a multimeter with a ratio of 1V ═ 2A, the power consumption test of the tested servo valve is realized; the F test jack is a valve core position feedback test port of the tested servo valve and is used for monitoring a valve core position output signal of the tested servo valve through an internal circuit connected with the F test jack and determining the motion position of the valve core so as to judge whether the valve core fluctuation is normal or not; the D test jack is a command signal output jack and is used for outputting a command signal of the tester, and the signal specification depends on the selection of the waveband switch 5-4-1; the PE test socket is a protective ground for connecting the hand held housing 9; the test jack E is connected with the GND test jack in the tester and has the same action with the GND; the 24V/2A, +15V, -15V, +5V, +10V test jack is used for checking the servo valve tester trouble usefulness, for example because the servo valve tester damages because of operating personnel's misoperation, can measure the test jack and investigate the trouble fast through the measurement.
From the above, the servo valve connector 1 can be used for testing all servo valves with +24V power supply or ± 15V 6+ PE interfaces, and can set the enabling or disabling of the C port through the synchronous switch 8-1 of the servo valve connector port enabling module 8 according to the specific parameters of the servo valve, and remind through the second LED indicator light 8-2; the sliding switch 7-1 of the power supply switching module 7 is output through the servo valve connector to switch the power supply, and the first LED indicator lamp 7-2 is used for reminding; the valve core testing module 2 mainly aims at all servo valves which do not need power supply and only need to input signals, and corresponding testing jacks of the valve core testing module 2 are used for connecting the tested servo valves, so that testing can be performed. The servo valve connector 1 may be an eleven-core interface or the like.
Specific circuits as shown in fig. 1 and 2, the servo valve connector port enabling module 8 comprises a servo valve connector port enabling circuit and an enabling indicating circuit, the servo valve connector port enabling circuit comprises a synchronous switch 8-1 and a third resistor R03, the synchronous switch 8-1 comprises 1 to 6 terminals, 6 terminals are null, the synchronous switch 8-1 comprises two gears, a first gear 1 terminal and a first gear 3 terminal are in communication, a second gear 1 terminal and a second gear 6 terminal are in communication, a second gear 1 terminal and a second gear 2 terminal are in communication, a second gear 4 terminal and a second gear 5 terminal are in communication, and the enabling indicating circuit comprises a first resistor R01, a second resistor R02 and a second LED indicating lamp 8-2.
As shown in fig. 2, the servo valve connector output power switching module 7 comprises a power switching circuit and a power switching indication circuit, wherein the power switching circuit comprises a slide switch 7-1, and the power switching indication circuit comprises a first LED indicator light 7-2, a fourth resistor R04 and a fifth resistor R05; the slide switch 7-1 includes pins 1 to 16, wherein pins 3, 7, 10 and 14 are empty, pins 1 and 16 are connected with a 24V power supply, pin 2 is connected with an A port of the servo valve connector 1, pin 4 is connected with a +15V power supply, pins 5, 9 and 13 are grounded, pin 6 is connected with a B port of the servo valve connector 1, pin 8 is connected with a-15V power supply, pin 11 is connected with a C port of the servo valve connector 1, pin 12 is connected with a1 terminal of the synchronous switch 8-1, pin 15 is connected with one end of the third resistor R03, one end of the fourth resistor R04 and a 4 terminal of the synchronous switch 8-1, the other end of the third resistor R03 is connected with a2 terminal of the synchronous switch 8-1, the other end of the fourth resistor R04 is simultaneously connected with one end of the fifth resistor R05 and an anode of the first LED indicator light 7-2, the other end of the fifth resistor R05 and a cathode of the first LED indicator light 7-2 are grounded, the 3 terminal of the synchronous switch 8-1 is grounded, the 5 terminal of the synchronous switch is connected with one end of the second resistor R02, the other end of the second resistor R02 is connected with one end of the first resistor R01 and the anode of the second LED indicator light 8-2, and the other end of the first resistor R01 and the cathode of the second LED indicator light 8-2 are grounded; the sliding switch 7-1 comprises two gears, namely: 2 feet and 1 feet, 6 feet and 5 feet, 11 feet and 12 feet, and 15 feet and 16 feet; a second gear: 2 feet and 4 feet, 6 feet and 8 feet, 11 feet and 9 feet, and 15 feet and 13 feet.
In this embodiment, when the slide switch 7-1 is shifted to the first gear, the port a is connected to the 24V power supply, the port B is grounded, the port C is connected to the terminal 1 of the synchronous switch 8-1, the first LED indicator light 7-2 is turned on, at this time, the synchronous switch 8-1 is pressed, the port C is connected to the 24V power supply through the third resistor R03, that is, the port C is enabled, the second LED indicator light 8-2 is turned on, the synchronous switch 8-1 is bounced, at this time, the port C is grounded, that is, the port C is disabled, and the second LED indicator light 8-2 is turned off; when the sliding switch 7-1 is shifted to a second gear, the port A is connected with a +15V power supply, the port B is connected with a-15V power supply, the port C is grounded, the first LED indicator light 7-2 is turned off, the synchronous switch 8-1 is pressed or bounced, the second LED indicator light 8-2 is in a turned-off state, at the moment, the port C is grounded, and the port C is disabled.
The main functions of the command signal generator 5 are to provide a power supply signal and an input signal for the servo valve under test and to determine the position of the spool movement by monitoring the output signal of the position of the spool under test.
As shown in fig. 5, the core signal flow of the command signal generator 5 in this embodiment includes: the signal input and output module 5-1 generates an internal instruction signal or receives an external instruction signal, performs signal zero adjustment and then sends the internal instruction signal or the external instruction signal to the signal processing module 5-2, the signal processing module 5-2 performs bias processing on the received signal to generate internal bias voltage and performs proportional amplification, then the signal processing module 5-2 generates a stable current output signal through PI control and sends the stable current output signal to the signal switching module 5-4, the signal switching module 5-4 selects different instruction signal types through the matching of the band switch 5-4-1 and the potentiometer 5-4-2 to adjust the current or voltage output signal, and the signal input and output module 5-1 outputs the signal adjusted by the signal switching module to the servo connector 1 connected with a tested servo valve or a corresponding test jack of the valve core test module 2.
As shown in fig. 11 in particular, the command signal generator 5 includes a first analog operational amplifier U01, a second analog operational amplifier U02, a third analog operational amplifier U03, a fourth analog operational amplifier U04, a fifth analog operational amplifier U05, a sixth analog operational amplifier U06, a ninth analog operational amplifier U09, a tenth analog operational amplifier U10, an eleventh analog operational amplifier U11, a twelfth analog operational amplifier U12, a fourteenth analog operational amplifier U14, a fifteenth analog operational amplifier U15, and a sixteenth analog operational amplifier U16, and a first wave band switch SW1-a and a third wave band switch SW1-C, each of the first wave band switch SW1-a and the third wave band switch SW1-C including four gear positions.
Specifically, the second analog operational amplifier U02 and its peripheral circuits, and the fifth analog operational amplifier U05 and its peripheral circuits constitute a command signal input circuit portion of the signal input/output module 5-1, the second analog operational amplifier U02 and the surrounding circuits realize the signal zero setting function, specifically, the positive input end of the second analog operational amplifier U02 is connected with the resistance adjusting end c of the first rheostat RP1, one end a of the first varistor RP1 is connected to the +15V power supply through a thirteenth resistor R33, the other end b of the first varistor RP1 is connected to a-15V supply through a thirty-six resistor R36, the inverting input end of the second analog operational amplifier U02 is connected with the output end thereof, and the output end of the second analog operational amplifier U02 is also connected with the output end of the fifth analog operational amplifier U05 through a fifteenth resistor R35 and an eighteenth resistor R18; the fifth analog operational amplifier U05 and its surrounding circuits can realize the functions of generating internal command signals and receiving external command signals, and specifically, the positive input end of the fifth analog operational amplifier U05 is connected to the resistance adjustment end c of the sixth varistor RP6, one end a of the sixth varistor RP6 is connected to the +15V power supply through the ninety resistor R90, and the other end b of the sixth varistor RP6 is connected to the-15V power supply through the eighty-nine resistor R89.
The first analog operational amplifier U01, the third analog operational amplifier U03, the fourth analog operational amplifier U04, the sixth analog operational amplifier U06, and the fourteenth analog operational amplifier U14 together with the respective surrounding circuits constitute a main circuit portion of the signal processing module 5-2.
The first analog operational amplifier U01 and its surrounding circuits are used for generating an internal bias voltage, specifically, the forward input end of the first analog operational amplifier U01 is connected to one end of a tenth capacitor C10 and a resistance adjustment end C of a second rheostat RP2, the other end of the tenth capacitor RP6 is grounded, one end a of the second rheostat RP2 is connected to a +15V power supply through a thirty-four resistor R34, the other end b of the second rheostat RP2 is connected to a-15V power supply through a thirty-seven resistor R37, the reverse input end of the first analog operational amplifier U01 is connected to an output end, and the output end of the first analog operational amplifier U01 is further connected to the output end of the fourth analog operational amplifier U04 through a thirty-nine resistor R39 and a forty resistor R40.
The third analog operational amplifier U03, the fourth analog operational amplifier U04, the sixth analog operational amplifier U06, the fourteenth analog operational amplifier U14 and the circuits around the third analog operational amplifier U03 are used for amplifying signals in proportion, specifically, a forward input end of the third analog operational amplifier U03 is grounded through a sixteenth resistor R16, an inverting input end of the third analog operational amplifier U03 is connected with an output end of the fifth analog operational amplifier U05 through the eighteenth resistor R18, an output end of the second analog operational amplifier U02 is connected through the thirty-fifth resistor R35, an output end of the third analog operational amplifier U38756 is connected through a seventeenth resistor R17 and a fourth varistor RP4, and a resistance adjusting end c of the fourth varistor RP4 is connected with the output end of the third analog operational amplifier U03; the forward input end of the fourth analog operational amplifier U04 is grounded through a fifteenth resistor R15, the reverse input end of the fourth analog operational amplifier U04 is connected to the output end of the third analog operational amplifier U03 through a fourteenth resistor R14, the self output end is connected through a thirteenth resistor R13 and a third varistor RP3, the resistance adjustment end c of the third varistor RP3 is connected to the output end of the fourth analog operational amplifier U04, the reverse input end of the sixth analog operational amplifier U06 is connected to the output end of the fourth analog operational amplifier U04 through the forty-th resistor R40, the output end of the first analog operational amplifier U01 is connected through the thirty-ninth resistor R39, the forward input end of the sixth analog operational amplifier U06 is grounded through a thirty-eighteenth resistor R38, the reverse input end of the sixth analog operational amplifier U06 is further connected to the self output end through a fourth eleventh resistor R41, the reverse input end of the fourteenth analog operational amplifier U14 is connected with the output end of the third analog operational amplifier U03 through a fifty-eighth resistor R58 and is connected with the output end of the fourteenth analog operational amplifier U44 through a forty-fourth resistor R44, and the positive input end of the fourteenth analog operational amplifier U14 is grounded through a forty-third resistor R43.
The output end of the third analog operational amplifier U03 outputs a voltage signal of-4V- +4V, the output end of the first analog operational amplifier U01 outputs a +6V internal bias voltage, the voltage signal of-4V- +4V is superposed with the +6V internal bias voltage to generate a voltage of + 2V- +10V, the voltage is connected to the inverting input end of the sixth analog operational amplifier U06, and the output end of the sixth analog operational amplifier U06 outputs a voltage signal of-2V- + 10V; the output end of the fourteenth analog operational amplifier U14 outputs a voltage signal of-10V- + 10V.
The ninth analog operational amplifier U09, the tenth analog operational amplifier U10, the eleventh analog operational amplifier U11, the twelfth analog operational amplifier U12, the fifteenth analog operational amplifier U15, together with their respective peripheral circuits and the first band switch SW1-a, form a main circuit of the constant current module, so as to realize a function of generating a stable current output signal through PI control, specifically, a 2-stage end of the first band switch SW1-a is connected to an output end of the sixth analog operational amplifier U06, 3-and 4-stage ends of the first band switch SW1-a are connected to an output end of the third analog operational amplifier U03, and a 1-stage port of the first band switch SW1-a is empty; the gear selection end com of the first band switch SW1-a is connected with one end of a fourteenth capacitor C14 and one end of a forty-seventh resistor R47, the other end of the fourteenth capacitor C14 and the other end of the forty-seventh resistor R47 are grounded, the gear selection end com of the first band switch SW1-a is connected with the reverse input end of the ninth analog operational amplifier U09 through a fifty resistor R50, the reverse input end of the ninth analog operational amplifier U09 is further connected with the output end of the ninth analog operational amplifier U09 through a fifteenth capacitor C50, the reverse input end of the ninth analog operational amplifier U09 is further connected with the output end of the fifteenth analog operational amplifier U15 through a forty-nineteenth resistor R49, the input end of the ninth analog operational amplifier U09 is grounded, the reverse input end of the fifteenth analog operational amplifier U15 is connected with the output end of the rheostat U5 through a eighteenth resistor R28 and a fifth resistor RP5, the resistance adjusting end C of the fifth rheostat RP5 is connected to the output end of the fifteenth analog operational amplifier U15, the inverting input end of the fifteenth analog operational amplifier U15 is further connected to one end of a first capacitor C01 through a twelfth resistor R12, the other end of the first capacitor C01 is grounded, the forward input end of the fifteenth analog operational amplifier U15 is grounded through a twenty-fifth resistor R25, the forward input end of the fifteenth analog operational amplifier U15 is further connected to the output end of the ninth analog operational amplifier U09 through a twenty-sixth resistor R26 and a thirty-second resistor R32, the output end of the ninth analog operational amplifier U09 is connected to the input end of the tenth analog operational amplifier U10 through a thirty-first resistor R31, and is connected to the forward input end of the eleventh analog operational amplifier U11 through a thirty-second resistor R30, the forward input end of the twelfth analog operational amplifier U12 is connected to a twenty-ninth resistor R29, the respective inverting input ends of the tenth analog operational amplifier U10, the eleventh analog operational amplifier U11 and the twelfth analog operational amplifier U12 are connected to their own output ends, the tenth analog operational amplifier U10 is connected to one end of the thirty-second resistor R32 through a forty-sixteenth resistor R46, the eleventh analog operational amplifier U11 is connected to a forty-fifteenth resistor R45, the twelfth analog operational amplifier U12 is connected to one end of the thirty-seventh resistor R27, and the other end of the thirty-second resistor R32 is connected to the output end of the ninth analog operational amplifier U09.
The third band switch SW1-C, sixty-third resistor R63-sixty-fifth resistor R65, and eighty-sixth resistor R86-eighty-eighth resistor R88 constitute the main circuit portion of the signal switching module 5-4, so as to realize the function of selecting different command signal types, specifically, the shift selection terminal com of the third band switch SW1-C is connected to the non-ground terminal of the first capacitor C01, and is a signal output terminal, the 1, 2, 3, and 4 shift terminals of the third band switch SW1-C are used to select different signal outputs, the sixty-third resistor R63 and the eighty-sixth resistor R86 are connected in parallel to form a first branch of 20 Ω resistor, one end of the first branch is connected to the 4 shift terminal of the third band switch SW1-C, and the other end of the first branch is connected to one end of the second resistor R32 far from the output terminal of the ninth analog operational amplifier U09, generating a command signal of-50 mA- +50 mA; the sixty-fourth resistor R64 and the eighty-seventh resistor R87 are connected in parallel to form a second branch of 100 omega resistor, one end of the second branch is connected with the 3-gear end of the third band switch SW1-C, and the other end of the second branch is connected with one end of the thirty-second resistor R32 far away from the output end of the ninth analog operational amplifier U09 to generate command signals of-10 mA to +10 mA; the sixty-fifth resistor R65 and the eighty-eighth resistor R88 are connected in parallel to form a third branch of 50 omega resistor, one end of the third branch is connected with the 2-gear end of the third band switch SW1-C, and the other end of the third branch is connected with one end of the thirty-second resistor R32 far away from the output end of the ninth analog operational amplifier U09, so that command signals of +4mA to +20mA are generated; the 1 st gear end of the third band switch SW1-C is connected with the output end of the fourteenth analog operational amplifier U14 to generate a voltage signal of 10V- + 10V.
As shown in fig. 3 and 4, the working state indicating module 4 includes a tester switch 4-1 disposed on the hand-held housing 9, a charging interface 4-3 connected to the power module 6, an indicator lamp 4-2, and a high current indicating circuit 4-4, a battery voltage indicating circuit 4-5 and a current and voltage positive and negative indicating circuit 4-6 connected to the indicator lamp 4-2, wherein the indicator lamp 4-2 includes a third LED indicator lamp 4-2-1, a fourth LED indicator lamp 4-2-2 and a fifth LED indicator lamp 4-2-3.
As shown in fig. 9, the large current indication circuit 4-4 includes a thirteenth analog operational amplifier U13, a forty-second resistor R42, a fifty-second resistor R52 to a fifty-fifth resistor R55, a fifty-seventh resistor R57, a third diode D03, a fourth diode D04, and a thirteenth capacitor C13, a forward input terminal of the thirteenth analog operational amplifier U13 is grounded through the forty-second resistor R42, a reverse input terminal of the thirteenth analog operational amplifier U13 is respectively connected to one end of the fifty-fifth resistor R55 and one end of the fifty-fourth resistor R54, another end of the fifty-fifth resistor R55 is connected to an Ibatt test socket of the spool test module 2-2, another end of the fifty-fourth resistor R54 is respectively connected to one ends of the second resistor R52 and the fifty-third resistor R53, another end of the fifty-fifth resistor R52 is connected to a +15V power supply, the other end of the fifty-third resistor R53 is grounded, the inverting input terminal of the thirteenth analog operational amplifier U13 is also connected with the self output terminal through the thirteenth capacitor C13, the output end of the thirteenth analog operational amplifier U13 is further connected to the inverting input end of the thirteenth analog operational amplifier C13 through the cathode of the third diode D03, the anode of the third diode D03, the anode of the fourth diode D04 and the cathode of the fourth diode D04 in turn, one end of the fifty-seventh resistor R57 is connected to the output end of the thirteenth analog operational amplifier C13, the other end of the fifty-seventh resistor R57 is connected with the anode of the third LED indicator light 4-2-1, the other end of the third LED indicator light 4-2-1 is grounded, when the current in the circuit exceeds 2A, the third LED indicator lamp 4-2-1 is lightened to remind;
as shown in fig. 10, the battery voltage indicating circuit 4-5 includes an eighth analog operational amplifier U08, sixth to eleventh resistors R06-R11, a twenty-first resistor R21, a fifty-first resistor R51, a first diode D01, a second diode D02, and a second capacitor C02, a forward input terminal of the eighth analog operational amplifier U08 is grounded through the twenty-first resistor R21, a reverse input terminal of the eighth analog operational amplifier U08 is respectively connected to one end of the sixth resistor R06 and one end of the seventh resistor R07, the other end of the sixth resistor R06 is respectively connected to one end of the eighth resistor R08 and one end of the ninth resistor R09, the other end of the eighth resistor R08 is grounded, the other end of the ninth resistor R09 is connected to a +24V power supply, the other end of the seventh resistor R07 is respectively connected to one end of the tenth resistor R10 and one end of the eleventh resistor R11, the other end of the tenth resistor R10 is connected to a-15V power supply, the other end of the eleventh resistor R11 is grounded, the output end of the eighth analog operational amplifier U08 is connected to the inverting input end of the eighth analog operational amplifier U08 through the second capacitor C02, the output end of the eighth analog operational amplifier U08 is further connected to the inverting input end of the eighth analog operational amplifier U08 through the cathode of the first diode D01, the anode of the first diode D01, the anode of the second diode D02 and the cathode of the second diode D02 in sequence, one end of the fifty-first resistor R51 is connected to the output end of the eighth analog operational amplifier U08, the other end of the fifty-first resistor R51 is connected to one end of the fourth LED indicator 4-2-2, the other end of the fourth LED indicator 4-2-2 is grounded, the fourth LED indicator 4-2-2 comprises two LED indicator lamps which are connected in parallel in a reverse direction, the two indicator lamps are green and red respectively, when the power supply voltage is higher than 19V, the fourth LED indicator lamp 4-2-2 is turned on to be green, and when the power supply voltage is lower than 19V, the fourth LED indicator lamp 4-2-2 is turned on to be red for reminding the battery to charge.
As shown in fig. 11, the current-voltage positive-negative indicating circuit 4-6 includes a sixteenth analog operational amplifier U16, a twenty-second resistor R22 to a twenty-fourth resistor R24, a forty-eighth resistor R48, a fifty-sixth resistor R56, a sixty-first resistor R61 and a sixty-second resistor R62, a forward input terminal of the sixteenth analog operational amplifier U16 is grounded through the twenty-fourth resistor R24, an inverting input terminal of the sixteenth analog operational amplifier U16 is connected to an output terminal of the fifteenth analog operational amplifier U15 through the twenty-third resistor R23, an inverting input terminal of the sixteenth analog operational amplifier U16 is further connected to an output terminal of the sixteenth analog operational amplifier U16 through a twenty-twelfth resistor R22, an output terminal of the sixteenth analog operational amplifier U16 is further connected to one end of the fifth LED indicator light 4-2-3 through the fifty-sixth resistor R56, the other end of the fifth LED indicator lamp 4-2-3 is grounded, the fifth LED indicator lamp 4-2-3 comprises two LED indicator lamps which are connected in parallel in the same direction and are respectively red and green, a sixty-first resistor R61 is connected between the anode and the cathode of the green lamp in parallel, a sixty-second resistor R62 is connected between the anode and the cathode of the red lamp in parallel, the anode of the red lamp is connected with the output end of the fifteenth analog operational amplifier U15 through a forty-eighth resistor R48, when the output current or voltage is positive, the fifth LED indicator lamp 4-2-3 is used for reminding when the output current or voltage is negative, and the fifth LED indicator lamp 4-2-3 is used for reminding when the output current or voltage is negative.
As shown in FIG. 6 and FIG. 7, the 24V to + -15V adjustable power conversion module 6-1 comprises a PCB 6-1-1 and an output voltage adjusting module 6-1-2 arranged on the PCB 6-1-1 for adjusting the output voltage, a switching frequency adjusting module 6-1-4 for adjusting the switching frequency, a slow start adjusting module 6-1-5 for adjusting the slow start time, an under-voltage locking threshold adjusting module 6-1-3 for setting the start voltage, a DC/DC conversion chip 6-1-10 for voltage conversion, an input port 6-1-6 for power input, a positive voltage output port 6-1-7 for positive voltage output, a negative voltage output port 6-1-8 for negative voltage output, GND ports 6-1-9 for grounding and filter modules 6-1-11 for stabilizing voltage; the output voltage adjusting module 6-1-2, the switching frequency adjusting module 6-1-4, the slow start adjusting module 6-1-5, the under-voltage lock threshold adjusting module 6-1-3, the input port 6-1-6, the positive voltage output port 6-1-7, the negative voltage output port 6-1-8, and the GND port 6-1-9 are respectively connected with the DC/DC conversion chip 6-1-10, the output voltage adjusting module 6-1-2, the switching frequency adjusting module 6-1-4, the slow start adjusting module 6-1-5, and the under-voltage lock threshold adjusting module 6-1-3 respectively control the output voltage, the, Switching frequency, slow start time and start voltage; an over-temperature protection module and an over-current protection module are arranged in the DC/DC conversion chip 6-1-10; the input port 6-1-6 is connected with a 24V power supply provided by the battery, +15V voltage is output through the positive voltage output port 6-1-7, and-15V voltage is output through the negative voltage output port 6-1-8.
The GND ports 6-1-9 in this embodiment include a first GND port 6-1-9-1 and a second GND port 6-1-9-2.
The DC/DC conversion chip 6-1-10 comprises a first DC/DC conversion chip A1 for outputting +15V and a second DC/DC conversion chip A2 for outputting-15V voltage, the first DC/DC conversion chip A1 is internally provided with a first over-temperature protection module 7-11-1 and a first over-current protection module 7-12-1, the second DC/DC conversion chip A2 is internally provided with a second over-temperature protection module 7-11-2 and a second over-current protection module 7-12-2, the first DC/DC conversion chip A1 and the second DC/DC conversion chip A2 are mutually independent and share the GND ports 6-1-9 and the input ports 6-1-6, the first DC/DC conversion chip A350 1 adopts an LMZ 03 voltage conversion chip, the second DC/DC conversion chip A2 adopts an LMZ34002 voltage conversion chip.
The output voltage regulation module 6-1-2 comprises a positive voltage regulation module 6-1-2-1 and a negative voltage regulation module 6-1-2-2, wherein: the positive voltage regulating module 6-1-2-1 is used for regulating the output voltage of a first DC/DC conversion chip A1, and comprises a ninety-fourth resistor R94, wherein a pin 36 of the first DC/DC conversion chip A1 is connected with one end of the ninety-fourth resistor R94, the other end of the ninety-fourth resistor R94 is connected with a pin 10 of a first DC/DC conversion chip A1, pins 10 to 15 and 39 of the first DC/DC conversion chip A1 are connected with the positive voltage output port 6-1-7, and the positive voltage output port 6-1-7 outputs +15V voltage; the negative voltage adjusting module 6-1-2-2 is used for adjusting the output voltage of the second DC/DC converting chip a2, and includes a ninety third resistor R93, the pin 36 of the second DC/DC converting chip a2 is connected to one end of the ninety third resistor R93, the other end of the ninety third resistor R93 is connected to the GND port 6-1-9, the pins 1, 4, 5, 8, 9, 16 to 20, 29, 32 to 34, 37, 40 of the second DC/DC converting chip a2 are connected to the negative voltage output port 6-1-8, and the negative voltage output port 6-1-8 outputs a voltage of-15V.
Setting the resistance values of the ninety-fourth resistor R94 and the ninety-third resistor R93 of the output voltage adjusting module 6-1-2 to 178K according to the output voltage of + -15V with reference to equation 1 and equation 2, wherein V isOUT1Is the output voltage, V, of the first DC/DC converter chip A1OUT2Is the output voltage of the second DC/DC conversion chip a2.
Figure BDA0001870418280000241
Figure BDA0001870418280000242
The switching frequency adjusting module 6-1-4 comprises a positive power switching frequency adjusting module 6-1-4-1 and a negative power switching frequency adjusting module 6-1-4-2, wherein: the positive power switching frequency adjusting module 6-1-4-1 is used for setting the switching frequency of the first DC/DC conversion chip a1, and includes a ninety-fifth resistor R95, a pin 31 of the first DC/DC conversion chip a1 is connected to one end of the ninety-fifth resistor R95, and the other end of the ninety-fifth resistor R95 is connected to the GND port 6-1-9 together with a pin 29 of the first DC/DC conversion chip a1. The switching frequency of the first DC/DC conversion chip a1 is set to 800KHz, and the value of the ninety-fifth resistor R95 is correspondingly set to 0, i.e., short-circuited.
The negative power switching frequency adjusting module 6-1-4-2 is used for setting the switching frequency of the second DC/DC conversion chip a2, and includes a ninety-eighth resistor R98, wherein the pin 30 of the second DC/DC conversion chip a2 is connected to one end of the ninety-eighth resistor R98, and the other end of the ninety-eighth resistor R98 is connected to the pin 9 of the second DC/DC conversion chip a2. The switching frequency of the second DC/DC conversion chip a2 is set to 1000KHz, and the resistance value of the ninety-eight resistor R98 is correspondingly set to 178K.
The slow-start regulating module 6-1-5 comprises a positive power supply slow-start regulating module 6-1-5-1 and a negative power supply slow-start regulating module 6-1-5-2, wherein: the positive power supply slow-start regulating module 6-1-5-1 is used for setting the slow start time of the first DC/DC conversion chip A1, and comprises a twenty-fourth capacitor C24, wherein a pin 28 of the first DC/DC conversion chip A1 is connected with one end of the twenty-fourth capacitor C24, and the other end of the twenty-fourth capacitor C24 is connected with the GND port 6-1-9; the slow start time of the first DC/DC conversion chip a1 is set to 17ms, and the capacitance value of the corresponding twenty-fourth capacitor C24 is set to 22 nf.
The negative power supply slow-start adjusting module 6-1-5-2 is configured to set a slow start time of the second DC/DC converting chip a2, and includes a twenty-second capacitor C22, a pin 28 of the second DC/DC converting chip a2 is connected to one end of the twenty-second capacitor C22, and the other end of the twenty-second capacitor C22 is connected to a pin 37 of the second DC/DC converting chip a2. The slow start time of the second DC/DC conversion chip a2 is set to 17ms, and the capacitance value of the corresponding twenty-second four capacitor C22 is set to 15 nf.
The undervoltage locking threshold adjusting module 6-1-3 comprises a positive power supply undervoltage locking threshold adjusting module 6-1-3-1 and a negative power supply undervoltage locking threshold adjusting module 6-1-3-2, wherein:
the positive power supply under-voltage locking threshold value adjusting module 6-1-3-1 is used for setting the starting voltage of the first DC/DC conversion chip A1, and comprises a ninety-sixth resistor R96 and a ninety-seventh resistor R97, wherein a pin 26 of the first DC/DC conversion chip A1 is connected with one end of the ninety-sixth resistor R96, the other end of the ninety-sixth resistor R96 and one end of the ninety-seventh resistor R97 are connected with a pin 27 of the first DC/DC conversion chip A1, and the other end of the ninety-seventh resistor R97 is connected with the GND port 6-1-9;
the negative power supply under-voltage locking threshold value adjusting module 6-1-3-2 is used for setting the starting voltage of the second DC/DC conversion chip a2, and includes a ninety first resistor R91 and a ninety second resistor R92, one end of the ninety first resistor R91 is connected to pin 26 of the second DC/DC conversion chip a2, the other end of the ninety first resistor R91 is connected to pin 27 of the second DC/DC conversion chip a2 together with one end of the ninety second resistor R92, and the other end of the ninety second resistor R92 is connected to pin 29 of the second DC/DC conversion chip a2.
Further, the start voltage is set to 80% of the input voltage, the start voltages of the first and second DC/DC conversion chips a1 and a2 are both set to 20V, the resistances of the ninety seventh resistor R97 and the ninety second resistor R92 of the under-voltage-lockout threshold adjustment module 6-1-3-2 are set according to the start voltages, the resistances of the ninety seventh resistor R97 and the ninety second resistor R92 are both set to 11.5K with reference to equation 3 and equation 4, where V isON1Is the starting voltage, V, of the first DC/DC converter chip A1ON2Is the starting voltage of the second DC/DC conversion chip a2.
Figure BDA0001870418280000251
Figure BDA0001870418280000252
The filtering modules 6-1-11 include a first filtering module 6-1-11-1, a second filtering module 6-1-11-2, a third filtering module 6-1-11-3 and a fourth filtering module 6-1-11-4, the first filtering module 6-1-11-1 is used for input power filtering of the first DC/DC converting chip A1, the second filtering module 6-1-11-2 is used for input power filtering of the second DC/DC converting chip A2, the third filtering module 6-1-11-3 is used for output power filtering of the first DC/DC converting chip A1, the fourth filtering module 6-1-11-4 is used for output power filtering of the second DC/DC converting chip A2, wherein: the first filtering module 6-1-11-1 comprises a twentieth capacitor C20, one end of the twentieth capacitor C20 is connected to the 26 pin of the first DC/DC conversion chip A1, and the other end of the twentieth capacitor C20 is connected to the GND port 6-1-9; the second filtering module 6-1-11-2 comprises an eighteenth capacitor C18, one end of the eighteenth capacitor C18 is connected to the 26 pin of the second DC/DC conversion chip A2, and the other end of the eighteenth capacitor C18 is connected to the GND port 6-1-9; the third filtering module 6-1-11-3 comprises a twenty-third capacitor C23, the twenty-third capacitor C23 is an electrolytic capacitor, the anode of the twenty-third capacitor C23 is connected to the positive voltage output port 6-1-7, and the cathode of the twenty-third capacitor C23 is connected to the GND port 6-1-9; the fourth filtering module 6-1-11-4 comprises a twenty-first capacitor C21, the twenty-first capacitor C21 is an electrolytic capacitor, the negative electrode of the twenty-first capacitor C21 is connected to the negative voltage output port 6-1-8, and the positive electrode of the twenty-first capacitor C21 is connected to the GND port 6-1-9. The capacitance values of the eighteenth capacitor C18 and the twentieth capacitor C20 are 22uf, and the capacitance values of the twenty-first capacitor C21 and the twenty-third capacitor C23 are 100 uf.
And a nineteenth capacitor C19 of a coupling capacitor is connected between the input ports 6-1-6 and the negative voltage output port 6-1-8, so that the ripple of an output power supply can be reduced, and the transient response can be improved, wherein the capacitance value of the nineteenth capacitor C19 is 2.2 uf.
As shown in fig. 8, the 24V to +5V power module 6-4 includes a third power conversion module a3, a sixteenth capacitor C16 and a seventeenth capacitor C17; the third power conversion module A3 is a power conversion chip LP2950, and its pin 1 is connected to one end of a seventeenth capacitor C17, the other end of the seventeenth capacitor C17 is grounded, the pin 2 of the third power conversion module A3 is grounded, the pin 3 of the third power conversion module A3 is connected to one end of a sixteenth capacitor C16, and the other end of the sixteenth capacitor C16 is connected to ground. The pin 3 of the third power conversion module a3 outputs +5V voltage.
As shown in fig. 12, the signal acquisition and display module 3 includes a digital voltmeter 3-1 and a voltage acquisition circuit 3-2, a specific numerical value of the command signal is visually displayed through a liquid crystal display of the digital voltmeter 3-1, the signal acquisition and display module 3 is connected to the power module 6 and is powered by the power module, the voltage acquisition circuit 3-2 is connected to a corresponding end of the command signal generator 5, the voltage at the point is acquired, the voltage value at the acquisition point is converted into a current value to be displayed on the display screen by calculating a relationship between the voltage and the current, quantized different signal changes are displayed in different signal ranges, and the digit and precision of the voltmeter are adjusted and displayed on the display screen by using a voltage division principle, specifically: the voltage acquisition circuit 3-1 comprises sixty-sixth resistors R66-eighty-fifth resistors R85 and a second band switch SW1-B, the second band switch SW1-B comprises four gears, the second band switch SW1-B, the first band switch SW1-A and the third band switch SW1-C jointly form the band switch 5-4-1, voltage values of corresponding points are acquired by the voltage acquisition circuit 3-2 and displayed on the digital voltmeter 3-1, the unit is V, when the current value of a current gear needs to be displayed, the acquired voltage values are converted into current values according to the relation between the voltage of the acquisition points in the circuit and the output current and displayed on the digital voltmeter 3-1, and the unit is mA; an output port of the sixteenth analog operational amplifier U16 is sequentially connected in series with sixty-sixth to seventy-fifth resistors R66 to R70 and eighty-first to seventy-seventh resistors R81 to R77 and then grounded, a 4-step end of the second band switch SW1-B is connected between the seventy-fifth resistor R70 and the eighty-first resistor R81, a 3-step end of the second band switch SW1-B is connected between the seventy-eighth resistor R78 and the seventy-ninth resistor R79, a 2-step end of the second band switch SW1-B is connected between the seventy-eighth resistor R78 and the seventy-seventh resistor R77, a 1-step end of the second band switch SW1-B is grounded through a seventy-sixth resistor R76, a 1-step end of the second band switch SW1-B is further sequentially connected in series with seventy-fifth to seventy-seventh resistors R71 and then connected in series with the fourteenth analog operational amplifier U57323 and eighty-seventh resistors R85 The output end is connected, and the gear selection port of the second band switch SW1-B is connected with the digital voltmeter 3-1; the output ends of the fourteenth analog operational amplifier U14 and the sixteenth analog operational amplifier U16 are voltage collecting points, the voltage collected from the output end of the fourteenth analog operational amplifier U14 is used for displaying the value of the output voltage, and the voltage collected from the output end of the sixteenth analog operational amplifier U16 is used for displaying the value of the output current.
In the actual detection work, the tester can perform online detection on the connected servo valve to be detected, and judges whether the servo valve to be detected works normally or not by changing the instruction signal of the servo valve to be detected under the condition of ensuring that the servo valve to be detected has oil pressure. When the general coil type servo valve is detected on line, a tester gives a positive and negative instruction signal, a load comprises a hydraulic cylinder and a hydraulic motor, the action of the hydraulic cylinder and the hydraulic motor can reflect the expansion and contraction of the oil cylinder, the oil motor can rotate positively and negatively, the quality of the valve can be judged through the action of the load, the electric feedback type servo valve judges whether the tested servo valve is normal or not through an F test jack of the valve core test module 2 or an F test port of the servo valve connector 1, and a special case of the DDV servo valve in the electric feedback type servo valve does not need to reflect the normality of the tested servo valve through the F test jack of the valve core test module 2 or the F test port of the servo valve connector 1, so that the valve core drive of the servo valve can be driven by the motor without hydraulic pressure.
Detailed description of the preferred embodiment
The testing method using the handheld portable servo valve tester is characterized by comprising the following steps of:
(1) according to the type of the tested servo valve, selecting to connect the tested servo valve with a handheld portable servo valve tester through the servo valve connector 1 or the valve core testing module 2;
(2) when a servo valve is tested through the servo valve connector 1, controlling the enabling or disabling of the port of the servo valve connector 1 through the synchronous switch 8-1 of the servo valve connector port enabling module 8 according to the parameter of the tested servo valve; the sliding switch 7-1 of the power supply switching module 7 is switched to a power supply matched with the servo valve to be tested through the servo valve connector;
(3) the range of the required instruction signal is adjusted through the band switch 5-4-1 of the signal switching module 5-4;
(4) adjusting the potentiometer 5-4-2 of the signal switching module 5-4 to select a proper signal so as to perform corresponding test on the servo valve to be tested;
(5) in the test, the numerical value displayed by the signal acquisition display module 3, the signal parameter adjusted by the potentiometer 5-4-2 of the signal switching module 5-4, the F test jack of the valve core test module 2 connected with the tested servo valve or the F terminal feedback signal of the servo valve connector 1 connected with the tested servo valve are judged, and then the performance of the tested servo valve and the fault of the tested servo valve are summarized according to whether the load action of the tested servo valve can be reflected therewith or not.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made without departing from the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. The utility model provides a portable servovalve tester of hand-held type which characterized in that: the device comprises a handheld shell (9), a servo valve connector (1) arranged on the handheld shell (9), a power module (6), an instruction signal generator (5), a valve core testing module (2), a signal acquisition and display module (3), a servo valve connector port enabling module (8), a servo valve connector output power switching module (7) and a working state indicating module (4) which are arranged in the handheld shell (9); the valve core testing module (2) is internally provided with a first valve core testing module (2-1) and a second valve core testing module (2-2), the first valve core testing module (2-1) comprises C, D, E, F, PE, 24V/2A, GND, +15V and-15V multiple discrete testing jacks, the second valve core testing module (2-2) comprises +5V, GND, Ibatt and +/-10V multiple discrete testing jacks, and each testing jack of the valve core testing module (2) and each connecting terminal of the servo valve connector (1) are respectively connected with the corresponding end of the command signal generator (5); the instruction signal generator (5) comprises a signal input and output module (5-1), a signal processing module (5-2), a constant current source module (5-3) and a signal switching module (5-4), wherein the signal processing module (5-2), the constant current source module (5-3) and the signal switching module (5-4) are respectively connected with the signal input and output module (5-1); the power supply module (6) is respectively connected with the instruction signal generator (5), the signal acquisition and display module (3), the signal input and output module (5-1), the servo valve connector port enabling module (8), the servo valve connector output power supply switching module (7) and the working state indicating module (4), and supplies power to a connected tested servo valve through the valve core testing module (2) and the servo valve connector (1);
the handheld shell (9) is made of PA66 plastic and mainly comprises an upper cover and a lower bottom, a sealing groove is formed at the joint of the upper cover and the lower bottom, and a silicon rubber sealing ring is arranged in the sealing groove; the signal switching module (5-4) comprises a wave band switch (5-4-1) and a potentiometer (5-4-2), different signals can be switched, and rubber gaskets are arranged at positions where knobs of the wave band switch (5-4-1) and the potentiometer (5-4-2) are in contact with the upper cover;
the power supply module (6) comprises a battery (6-2), a battery management module (6-3), a 24V-to- +/-15V adjustable power supply conversion module (6-1) and a 24V-to- +5V power supply module (6-4) which are sequentially connected; the battery (6-2) is a 24V rechargeable lithium battery pack, and the battery management module (6-3) comprises a charging circuit and an overcurrent protection circuit;
the servo valve connector (1) comprises seven pins A, B, C, D, E, F and PE;
the servo valve connector port enabling module (8) comprises a servo valve connector port enabling circuit and an enabling indicating circuit, the servo valve connector port enabling circuit comprises a synchronous switch (8-1) and a third resistor (R03), the synchronous switch (8-1) comprises 1 to 6 terminals, 6 terminals are null, the synchronous switch (8-1) comprises two gears, a first gear is in a state of being communicated with 1 terminal and 3 terminals, a second gear is in a state of being communicated with 1 terminal and 2 terminals, a second gear is in a state of being communicated with 4 terminals and 5 terminals, and the enabling indicating circuit comprises a first resistor (R01), a second resistor (R02) and a second LED indicating lamp (8-2);
the servo valve connector output power switching module (7) comprises a power switching circuit and a power switching indicating circuit, the power switching circuit comprises a sliding switch (7-1), and the power switching indicating circuit comprises a first LED indicating lamp (7-2), a fourth resistor (R04) and a fifth resistor (R05); the slide switch (7-1) comprises 1 to 16 pins, wherein 3, 7, 10 and 14 pins are empty, 1 pin and 16 pins are connected with a 24V power supply, 2 pins are connected with an A port of the servo valve connector (1), 4 pins are connected with a +15V power supply, 5, 9 and 13 pins are connected with a ground, 6 pins are connected with a B port of the servo valve connector (1), 8 pins are connected with a-15V power supply, 11 pins are connected with a C port of the servo valve connector (1), 12 pins are connected with a1 terminal of the synchronous switch (8-1), 15 pins are connected with one end of the third resistor (R03), one end of the fourth resistor (R04) and a 4 terminal of the synchronous switch (8-1), the other end of the third resistor (R03) is connected with a2 terminal of the synchronous switch (8-1), and the other end of the fourth resistor (R04) is simultaneously connected with one end of the fifth resistor (R05) and an anode of the first indicator light (7-2), the other end of the fifth resistor (R05) and the cathode of the first LED indicator light (7-2) are grounded, the 3 terminal of the synchronous switch (8-1) is grounded, the 5 terminal of the synchronous switch is connected with one end of the second resistor (R02), the other end of the second resistor (R02) is connected with one end of the first resistor (R01) and the anode of the second LED indicator light (8-2), and the other end of the first resistor (R01) and the cathode of the second LED indicator light (8-2) are grounded; the sliding switch (7-1) comprises two gears, namely: 2 feet and 1 feet, 6 feet and 5 feet, 11 feet and 12 feet, and 15 feet and 16 feet; a second gear: 2 feet and 4 feet, 6 feet and 8 feet, 11 feet and 9 feet, and 15 feet and 13 feet;
the working state indicating module (4) comprises a tester switch (4-1) arranged on the handheld shell (9), a charging interface (4-3) connected with the power module (6), an indicating lamp (4-2), and a large current indicating circuit (4-4) connected with the indicating lamp (4-2), a battery voltage indicating circuit (4-5) and a current and voltage positive and negative indicating circuit (4-6), wherein the indicating lamp (4-2) comprises a third LED indicating lamp (4-2-1), a fourth LED indicating lamp (4-2-2) and a fifth LED indicating lamp (4-2-3), wherein:
the high-current indicating circuit (4-4) comprises a thirteenth analog operational amplifier (U13), a forty-second resistor (R42), a fifty-second resistor (R52) to a fifty-fifth resistor (R55), a fifty-seventh resistor (R57), a third diode (D03), a fourth diode (D04) and a thirteenth capacitor (C13), wherein a forward input end of the thirteenth analog operational amplifier (U13) is grounded through the forty-second resistor (R42), a reverse input end of the thirteenth analog operational amplifier (U13) is respectively connected with one end of the fifty-fifth resistor (R55) and one end of the fifty-fourth resistor (R54), another end of the fifty-fifth resistor (R55) is connected with an Ibatt test socket of the spool test module (2-2), and the other end of the fifty-fourth resistor (R54) is respectively connected with one end of the fifty-second resistor (R52) and one end of the third resistor (R53), the other end of the fifty-second resistor (R52) is connected with a +15V power supply, the other end of the fifty-third resistor (R53) is grounded, the reverse input end of the thirteenth analog operational amplifier (U13) is also connected with the self output end through the thirteenth capacitor (C13), the output end of the thirteenth analog operational amplifier (U13) is also connected with the reverse input end of the thirteenth analog operational amplifier (C13) through the cathode of the third diode (D03), the anode of the third diode (D03), the anode of the fourth diode (D04) and the cathode of the fourth diode (D04) in sequence, one end of the fifty-seventh resistor (R57) is connected with the output end of the thirteenth analog operational amplifier (C13), the other end of the fifty-seventh resistor (R57) is connected with the anode of the third LED indicator light (4-2-1), the other end of the third LED indicator lamp (4-2-1) is grounded;
the battery voltage indicating circuit (4-5) comprises an eighth analog operational amplifier (U08), a sixth resistor (R06) to an eleventh resistor (R11), a twenty-first resistor (R21), a fifty-first resistor (R51), a first diode (D01), a second diode (D02) and a second capacitor (C02), wherein a forward input end of the eighth analog operational amplifier (U08) is grounded through the twenty-first resistor (R21), a reverse input end of the eighth analog operational amplifier (U08) is respectively connected with one end of the sixth resistor (R06) and one end of the seventh resistor (R07), the other end of the sixth resistor (R06) is respectively connected with one end of the eighth resistor (R08) and one end of the ninth resistor (R09), the other end of the eighth resistor (R08) is grounded, and the other end of the ninth resistor (R09) is connected with a +24V power supply, the other end of the seventh resistor (R07) is respectively connected with one end of the tenth resistor (R10) and one end of the eleventh resistor (R11), the other end of the tenth resistor (R10) is connected with a-15V power supply, the other end of the eleventh resistor (R11) is grounded, the output end of the eighth analog operational amplifier (U08) is connected with the reverse input end of the eighth analog operational amplifier (U08) through the second capacitor (C02), the output end of the eighth analog operational amplifier (U08) is also connected with the reverse input end of the eighth analog operational amplifier (U08) through the cathode of the first diode (D01), the anode of the first diode (D01), the anode of the second diode (D02) and the cathode of the second diode (D02) in sequence, one end of the first resistor (R51) is connected with the output end of the eighth analog operational amplifier (U08), the other end of the fifty-first resistor (R51) is connected with one end of the fourth LED indicator (4-2-2), the other end of the fourth LED indicator (4-2-2) is grounded, and the fourth LED indicator (4-2-2) comprises two LED indicator lamps which are connected in parallel in an opposite direction;
the current and voltage positive and negative indication circuit (4-6) comprises a sixteenth analog operational amplifier (U16), a twenty-second resistor (R22) to a twenty-fourth resistor (R24), a forty-eighth resistor (R48), a fifty-sixth resistor (R56), a sixty-first resistor (R61) and a sixty-second resistor (R62), wherein a forward input end of the sixteenth analog operational amplifier (U16) is grounded through the twenty-fourth resistor (R24), a reverse input end of the sixteenth analog operational amplifier (U16) is connected with an output end of the fifteenth analog operational amplifier (U15) through the twenty-third resistor (R23), a reverse input end of the sixteenth analog operational amplifier (U16) is further connected with an output end of the sixteenth analog operational amplifier (U16) through a twenty-second resistor (R22), and an output end of the sixteenth analog operational amplifier (U16) is further connected with a sixth resistor (R56) and the fifth LED 4-lamp (LED 56) 2-3), the other end of the fifth LED indicator lamp (4-2-3) is grounded, the fifth LED indicator lamp (4-2-3) comprises two LED indicator lamps which are connected in parallel in the same direction, the two LED indicator lamps are respectively connected with the sixty-first resistor (R61) and the sixty-second resistor (R62) in parallel, and the fifth LED indicator lamp (4-2-3) is also connected with the output end of a fifteenth analog operational amplifier (U15) through the forty-eighth resistor (R48);
the instruction signal generator (5) includes a first analog operational amplifier (U01), a second analog operational amplifier (U02), a third analog operational amplifier (U03), a fourth analog operational amplifier (U04), a fifth analog operational amplifier (U05), a sixth analog operational amplifier (U06), a ninth analog operational amplifier (U09), a tenth analog operational amplifier (U10), an eleventh analog operational amplifier (U11), a twelfth analog operational amplifier (U12), a fourteenth analog operational amplifier (U14), a fifteenth analog operational amplifier (U15), and a sixteenth analog operational amplifier (U16), and a first band switch (SW1-A) and a third band switch (SW1-C), the first band switch (SW1-A) and the third band switch (SW1-C) each include four gear positions, wherein:
the second analog operational amplifier (U02) and its surrounding circuit and the fifth analog operational amplifier (U05) and its surrounding circuit constitute the command signal input circuit part of the signal input/output module (5-1), the second analog operational amplifier (U02) and its surrounding circuit realize the signal zero-setting function, specifically, the forward input end of the second analog operational amplifier (U02) is connected with the resistance adjusting end of the first rheostat (RP1), one end of the first rheostat (RP1) is connected to the +15V power supply through the thirty-third resistor (R33), the other end of the first rheostat (RP1) is connected to the-15V power supply through the thirty-sixth resistor (R36), the reverse input end of the second analog operational amplifier (U02) is connected with its output end, the output end of the second analog operational amplifier (U02) is further connected to the fifth analog operational amplifier through the fifteenth resistor (R35) and the eighteenth resistor (R18) U05) is connected; the fifth analog operational amplifier (U05) and the surrounding circuits thereof can realize the functions of generating internal command signals and receiving external command signals, in particular, the positive input end of the fifth analog operational amplifier (U05) is connected with the resistance adjusting end of a sixth rheostat (RP6), one end of the sixth rheostat (RP6) is connected to a +15V power supply through a ninety resistor (R90), and the other end of the sixth rheostat (RP6) is connected to a-15V power supply through an eighty-nine resistor (R89);
the first analog operational amplifier (U01), the third analog operational amplifier (U03), the fourth analog operational amplifier (U04), the sixth analog operational amplifier (U06), the fourteenth analog operational amplifier (U14) together with the respective surrounding circuits constitute a main circuit portion of the signal processing module (5-2),
the first analog operational amplifier (U01) and the surrounding circuit are used for generating an internal bias voltage, specifically, the forward input end of the first analog operational amplifier (U01) is connected with one end of a tenth capacitor (C10) and the resistance adjusting end of a second rheostat (RP2), the other end of the tenth capacitor (RP6) is grounded, one end of the second rheostat (RP2) is connected to a +15V power supply through a thirty-fourth resistor (R34), the other end of the second rheostat (RP2) is connected to a-15V power supply through a thirty-seventh resistor (R37), the reverse input end of the first analog operational amplifier (U01) is connected with the output end, and the output end of the first analog operational amplifier (U01) is also connected with the output end of the fourth analog operational amplifier (U04) through a thirty-ninth resistor (R39) and a forty-th resistor (R40);
the third analog operational amplifier (U03), the fourth analog operational amplifier (U04), the sixth analog operational amplifier (U06), the fourteenth analog operational amplifier (U14) and the surrounding circuits are used for signal proportional amplification, specifically, the positive input end of the third analog operational amplifier (U03) is grounded through a sixteenth resistor (R16), the inverting input terminal of the third analog operational amplifier (U03) is connected to the output terminal of the fifth analog operational amplifier (U05) through the eighteenth resistor (R18), connecting an output of the second analog operational amplifier (U02) through the thirty-fifth resistive connection (R35), the self output end is connected through a seventeenth resistor (R17) and a fourth rheostat (RP4), the resistance adjusting end of the fourth rheostat (RP4) is connected with the output end of the third analog operational amplifier (U03); a forward input terminal of the fourth analog operational amplifier (U04) is grounded through a fifteenth resistor (R15), a reverse input terminal of the fourth analog operational amplifier (U04) is connected to an output terminal of the third analog operational amplifier (U03) through a fourteenth resistor (R14), an output terminal thereof is connected through a thirteenth resistor (R13) and a third varistor (RP3), a resistance adjustment terminal of the third varistor (RP3) is connected to an output terminal of the fourth analog operational amplifier (U04), a reverse input terminal of the sixth analog operational amplifier (U06) is connected to an output terminal of the fourth analog operational amplifier (U04) through the forty-th resistor (R40), an output terminal of the first analog operational amplifier (U01) through the thirty-ninth resistor (R39), and a forward input terminal of the sixth analog operational amplifier (U06) is grounded through a thirty-eighth resistor (R38), the inverting input end of the sixth analog operational amplifier (U06) is also connected with the output end of the sixth analog operational amplifier through a fourth eleventh resistor (R41), the inverting input end of the fourteenth analog operational amplifier (U14) is connected with the output end of the third analog operational amplifier (U03) through a fifth eighteenth resistor (R58) and is connected with the output end of the fourteenth analog operational amplifier through a fourteenth resistor (R44), and the forward input end of the fourteenth analog operational amplifier (U14) is grounded through a fourteenth resistor (R43);
the ninth analog operational amplifier (U09), the tenth analog operational amplifier (U10), the eleventh analog operational amplifier (U11), the twelfth analog operational amplifier (U12), the fifteenth analog operational amplifier (U15) and their respective peripheral circuits, together with the first band switch (SW1-a), constitute a main circuit of the constant current source module (5-3), so as to realize a function of generating a stable current output signal through PI control, specifically: the 2-position end of the first band switch (SW1-A) is connected with the output end of the sixth analog operational amplifier (U06), the 3-position end and the 4-position end of the first band switch (SW1-A) are connected with the output end of the third analog operational amplifier (U03), and the 1-position port of the first band switch (SW1-A) is empty; the gear selection end of the first band switch (SW1-A) is connected with one end of a fourteenth capacitor (C14) and one end of a forty-seventh resistor (R47), the other end of the fourteenth capacitor (C14) and the forty-seventh resistor (R47) are grounded, the gear selection end of the first band switch (SW1-A) is connected with the reverse input end of the ninth analog operational amplifier (U09) through a fifty-th resistor (R50), the reverse input end of the ninth analog operational amplifier (U09) is further connected with the output end of the ninth analog operational amplifier (U3524) through a fifteenth capacitor (C50), the reverse input end of the ninth analog operational amplifier (U09) is further connected with the output end of the fifteenth analog operational amplifier (U15) through a fourth nineteenth resistor (R49), the forward input end of the ninth analog operational amplifier (U09) is grounded, and the input end of the fifteenth analog operational amplifier (U15) is connected with the output end of the fifteenth analog operational amplifier (U3542) through a eighteenth resistor (R28) and a fifth rheostat (R5) ) The resistance adjusting end of the fifth rheostat (RP5) is connected with the output end of the fifteenth analog operational amplifier (U15), the inverting input end of the fifteenth analog operational amplifier (U15) is further connected with one end of a first capacitor (C01) through a twelfth resistor (R12), the other end of the first capacitor (C01) is grounded, the forward input end of the fifteenth analog operational amplifier (U15) is grounded through a twenty-fifth resistor (R25), the forward input end of the fifteenth analog operational amplifier (U15) is further connected with the output end of the ninth analog operational amplifier (U09) through a twenty-sixth resistor (R26) and a thirty-second resistor (R32), the output end of the ninth analog operational amplifier (U09) is connected with the forward input end of the tenth analog operational amplifier (U10) through a thirty-eleventh resistor (R31), is connected with the positive input end of the eleventh analog operational amplifier (U11) through a thirtieth resistor (R30), is connected with the positive input end of the twelfth analog operational amplifier (U12) through a twenty-ninth resistor (R29), the tenth analog operational amplifier (U10), the eleventh analog operational amplifier (U11), and the twelfth analog operational amplifier (U12) have their respective inverting inputs connected to their own outputs, the tenth analog operational amplifier (U10) is connected with one end of the thirty-second resistor (R32) through a forty-sixth resistor (R46), the eleventh analog operational amplifier (U11) is connected with one end of the thirty-second resistor (R45) through a forty-fifth resistor (R45), and the twelfth analog operational amplifier (U12) is connected with one end of the thirty-seventh resistor (R32) through a twenty-seventh resistor (R27), the other end of the thirty-second resistor (R32) is connected with the output end of the ninth analog operational amplifier (U09);
the third band switch (SW1-C), the sixty-third resistor (R63) to the sixty-fifth resistor (R65) and the eighty-sixth resistor (R86) to the eighty-eighth resistor (R88) form a main circuit part of the signal switching module (5-4), so as to realize a function of selecting different command signal types, specifically, a gear selection end of the third band switch (SW1-C) is connected with a non-ground end of the first capacitor (C01) and is a signal output end, a1, 2, 3 and 4 gear ends of the third band switch (SW1-C) are used for selecting different signal outputs, the sixty-third resistor (R63) and the eighty-sixth resistor (R86) are connected in parallel to form a first branch, one end of the first branch is connected with a 4 gear end of the third band switch (SW1-C), and the other end of the first branch is connected with the thirty-second resistor (R32) and is far away from a ninth analog operation output end of the U09 One end; the sixty-fourth resistor (R64) and the eighty-seventh resistor (R87) are connected in parallel to form a second branch, one end of the second branch is connected with the 3-gear end of the third band switch (SW1-C), and the other end of the second branch is connected with one end, away from the output end of the ninth analog operational amplifier (U09), of the thirty-second resistor (R32); the sixty-fifth resistor (R65) and the eighty-eighth resistor (R88) are connected in parallel to form a third branch, one end of the third branch is connected with the 2-gear end of the third band switch (SW1-C), and the other end of the third branch is connected with one end, away from the output end of the ninth analog operational amplifier (U09), of the thirty-second resistor (R32); the 1-gear end of the third band switch (SW1-C) is connected with the output end of the fourteenth analog operational amplifier (U14);
the signal acquisition display module (3) comprises a digital voltmeter (3-1) and a voltage acquisition circuit (3-2), wherein: the voltage acquisition circuit (3-1) comprises sixty-sixth resistors (R66) to eighty-fifth resistors (R85) and a second band switch (SW1-B), the second band switch (SW1-B) comprises four gears, the second band switch (SW1-B), the first band switch (SW1-A) and the third band switch (SW1-C) jointly form the band switch (5-4-1), the voltage value of the corresponding point is acquired by the voltage acquisition circuit (3-2) and displayed on the digital voltmeter (3-1), when the current value of the current gear needs to be displayed, the acquired voltage value is converted into the current value according to the relation between the voltage of the acquisition point and the output current in the circuit and displayed on the digital voltmeter (3-1), and the output port of the sixteenth analog operational amplifier (U16) is sequentially connected in series with the sixty-sixth resistors (R66) to seven resistors (R66) in series A tenth resistor (R70) and eighty-first to seventy-seventh resistors (R81) to (R77) are then grounded, a 4-step end of the second band switch (SW1-B) is connected between the seventy-fifth resistor (R70) and the eighty-first resistor (R81), a 3-step end of the second band switch (SW1-B) is connected between the seventy-eighth resistor (R78) and the seventy-ninth resistor (R79), a 2-step end of the second band switch (SW1-B) is connected between the seventy-eighth resistor (R78) and the seventy-seventh resistor (R77), a 1-step end of the second band switch (SW1-B) is grounded through a seventy-sixty resistor (R76), a 1-step end of the second band switch (SW 632-B) is further connected in series with the seventy-fifth to seventy-seventh resistors (R75) and the seventy-seventh resistor (R71) and the seventy-seventh resistor (R85) in sequence to simulate the amplification operation of the eighty-fourteenth resistor (R638) and the seventy-eighth resistor (R85) The output end of the device (U14) is connected, and the gear selection port of the second band switch (SW1-B) is connected with the digital voltmeter (3-1); the output ends of the fourteenth analog operational amplifier (U14) and the sixteenth analog operational amplifier (U16) are voltage collecting points, the voltage collected from the output end of the fourteenth analog operational amplifier (U14) is used for displaying the value of the output voltage, and the voltage collected from the output end of the sixteenth analog operational amplifier (U16) is used for displaying the value of the output current.
2. The hand-held portable servo valve tester as recited in claim 1, wherein the 24V to ± 15V adjustable power conversion module (6-1) comprises an output voltage adjusting module (6-1-2) for adjusting output voltage, a switching frequency adjusting module (6-1-4) for adjusting switching frequency, a slow start adjusting module (6-1-5) for adjusting slow start time, an under-voltage lock threshold adjusting module (6-1-3) for setting start voltage, a DC/DC conversion chip (6-1-10) for voltage conversion, an input port (6-1-6) for power input, a positive voltage output port (6-1-7) for positive voltage output, a negative voltage output port (6-1-8) for negative voltage output, A GND port (6-1-9) for grounding and a filter module (6-1-11) for stabilizing voltage; the output voltage adjusting module (6-1-2), the switching frequency adjusting module (6-1-4), the slow start adjusting module (6-1-5), the under-voltage locking threshold adjusting module (6-1-3), the input port (6-1-6), the positive voltage output port (6-1-7), the negative voltage output port (6-1-8) and the GND port (6-1-9) are respectively connected with the DC/DC conversion chip (6-1-10), the output voltage adjusting module (6-1-2), the switching frequency adjusting module (6-1-4), the slow start adjusting module (6-1-5), The undervoltage locking threshold value adjusting module (6-1-3) respectively controls the output voltage, the switching frequency, the slow start time and the start voltage of the DC/DC conversion chip (6-1-10); an over-temperature protection module and an over-current protection module are arranged in the DC/DC conversion chip (6-1-10); the input port (6-1-6) is connected with a 24V power supply provided by the battery, and +15V voltage is output through the positive voltage output port (6-1-7) and-15V voltage is output through the negative voltage output port (6-1-8);
the 24V-to- +5V power supply module (6-4) comprises a third power supply conversion module (A3), a sixteenth capacitor (C16) and a seventeenth capacitor (C17); the third power conversion module (A3) is a power conversion chip LP2950, a pin 1 of the third power conversion module is connected to one end of a seventeenth capacitor (C17), the other end of the seventeenth capacitor (C17) is grounded, a pin 2 of the third power conversion module (A3) is grounded, a pin 3 of the third power conversion module (A3) is connected to one end of a sixteenth capacitor (C16), and the other end of the sixteenth capacitor (C16) is connected to ground.
3. The hand-held portable servo valve tester as recited in claim 2, wherein the DC/DC conversion chip (6-1-10) comprises a first DC/DC conversion chip (A1) for outputting +15V and a second DC/DC conversion chip (A2) for outputting-15V voltage, the first DC/DC conversion chip (A1) is internally provided with a first over-temperature protection module (7-11-1) and a first over-current protection module (7-12-1), the second DC/DC conversion chip (A2) is internally provided with a second over-temperature protection module (7-11-2) and a second over-current protection module (7-12-2), the first DC/DC conversion chip (A1) and the second DC/DC conversion chip (A2) are independent from each other, the GND port (6-1-9) and the input port (6-1-6) are shared, the first DC/DC conversion chip (A1) adopts an LMZ35003 voltage conversion chip, and the second DC/DC conversion chip (A2) adopts an LMZ34002 voltage conversion chip.
4. The hand-held portable servo valve tester as recited in claim 2, wherein: the output voltage regulation module (6-1-2) comprises a positive voltage regulation module (6-1-2-1) and a negative voltage regulation module (6-1-2-2), wherein: the positive voltage regulating module (6-1-2-1) is used for regulating the output voltage of the first DC/DC conversion chip (A1), and comprises a ninety-fourth resistor (R94), wherein the 36 pin of the first DC/DC conversion chip (A1) is connected with one end of the ninety-fourth resistor (R94), the other end of the ninety-fourth resistor (R94) is connected with the 10 pin of the first DC/DC conversion chip (A1), and the 10-15 and 39 pins of the first DC/DC conversion chip (A1) are connected with the positive voltage output port (6-1-7); the negative voltage adjusting module (6-1-2-2) is used for adjusting the output voltage of the second DC/DC conversion chip (A2) and comprises a ninety third resistor (R93), wherein a pin 36 of the second DC/DC conversion chip (A2) is connected with one end of the ninety third resistor (R93), the other end of the ninety third resistor (R93) is connected with the GND port (6-1-9), and pins 1, 4, 5, 8, 9, 16-20, 29, 30, 32-34, 37 and 40 of the second DC/DC conversion chip (A2) are connected with the negative voltage output port (6-1-8).
5. The hand-held portable servo valve tester as recited in claim 2, wherein: the switching frequency adjustment module (6-1-4) comprises a positive power switching frequency adjustment module (6-1-4-1) and a negative power switching frequency adjustment module (6-1-4-2), wherein: the positive power switching frequency adjusting module (6-1-4-1) is used for setting the switching frequency of a first DC/DC conversion chip (A1), and comprises a ninety-fifth resistor (R95), wherein a pin 31 of the first DC/DC conversion chip (A1) is connected with one end of the ninety-fifth resistor (R95), and the other end of the ninety-fifth resistor (R95) and a pin 29 of the first DC/DC conversion chip (A1) are connected with the GND port (6-1-9); the negative power supply switching frequency adjusting module (6-1-4-2) is used for setting the switching frequency of a second DC/DC conversion chip (A2) and comprises a ninety-eighth resistor (R98), wherein a pin 30 of the second DC/DC conversion chip (A2) is connected with one end of the ninety-eighth resistor (R98), and the other end of the ninety-eighth resistor (R98) is connected with a pin 9 of the second DC/DC conversion chip (A2).
6. The hand-held portable servo valve tester as recited in claim 2, wherein: the slow-start regulating module (6-1-5) comprises a positive power supply slow-start regulating module (6-1-5-1) and a negative power supply slow-start regulating module (6-1-5-2), wherein: the positive power supply slow start regulating module (6-1-5-1) is used for setting the slow start time of a first DC/DC conversion chip (A1), and comprises a twenty-fourth capacitor (C24), wherein a pin 28 of the first DC/DC conversion chip (A1) is connected with one end of the twenty-fourth capacitor (C24), and the other end of the twenty-fourth capacitor (C24) is connected with the GND port (6-1-9); the negative power supply slow-start regulating module (6-1-5-2) is used for setting the slow start time of a second DC/DC conversion chip (A2), and comprises a twenty-second capacitor (C22), wherein a pin 28 of the second DC/DC conversion chip (A2) is connected with one end of the twenty-second capacitor (C22), and the other end of the twenty-second capacitor (C22) is connected with a pin 37 of the second DC/DC conversion chip (A2).
7. The hand-held portable servo valve tester as recited in claim 2, wherein: the undervoltage locking threshold adjusting module (6-1-3) comprises a positive power supply undervoltage locking threshold adjusting module (6-1-3-1) and a negative power supply undervoltage locking threshold adjusting module (6-1-3-2), wherein:
the positive power supply under-voltage locking threshold value adjusting module (6-1-3-1) is used for setting the starting voltage of a first DC/DC conversion chip (A1), and comprises a ninety-sixth resistor (R96) and a ninety-seventh resistor (R97), wherein a pin 26 of the first DC/DC conversion chip (A1) is connected with one end of the ninety-sixth resistor (R96), the other end of the ninety-sixth resistor (R96) and one end of the ninety-seventh resistor (R97) are connected with a pin 27 of the first DC/DC conversion chip (A1), and the other end of the ninety-seventh resistor (R97) is connected with the GND port (6-1-9);
the negative power supply under-voltage locking threshold value adjusting module (6-1-3-2) is used for setting the starting voltage of a second DC/DC conversion chip (A2), and comprises a ninety first resistor (R91) and a ninety second resistor (R92), one end of the ninety first resistor (R91) is connected with the 26 pin of the second DC/DC conversion chip (A2), the other end of the ninety first resistor (R91) is connected with one end of the ninety second resistor (R92) and is connected with the 27 pin of the second DC/DC conversion chip (A2), and the other end of the ninety second resistor (R92) is connected with the 29 pin of the second DC/DC conversion chip (A2).
8. The hand-held portable servo valve tester as recited in claim 2, wherein: the filtering module (6-1-11) comprises a first filtering module (6-1-11-1), a second filtering module (6-1-11-2), a third filtering module (6-1-11-3) and a fourth filtering module (6-1-11-4), the first filtering module (6-1-11-1) is used for input power filtering of a first DC/DC conversion chip (A1), the second filtering module (6-1-11-2) is used for input power filtering of a second DC/DC conversion chip (A2), the third filtering module (6-1-11-3) is used for output power filtering of the first DC/DC conversion chip (A1), and the fourth filtering module (6-1-11-4) is used for the second DC/DC conversion chip (A2) A2) The output power filter of (1), wherein: the first filtering module (6-1-11-1) comprises a twentieth capacitor (C20), one end of the twentieth capacitor (C20) is connected to the 26 pin of the first DC/DC conversion chip (A1), and the other end of the twentieth capacitor (C20) is connected to the GND port (6-1-9); the second filtering module (6-1-11-2) comprises an eighteenth capacitor (C18), one end of the eighteenth capacitor (C18) is connected to the 26 pin of the second DC/DC conversion chip (A2), and the other end of the eighteenth capacitor (C18) is connected with the GND port (6-1-9); the third filtering module (6-1-11-3) comprises a twenty-third capacitor (C23), the twenty-third capacitor (C23) is an electrolytic capacitor, the anode of the twenty-third capacitor (C23) is connected with the positive voltage output port (6-1-7), and the cathode of the twenty-third capacitor (C23) is connected with the GND port (6-1-9); the fourth filtering module (6-1-11-4) comprises a twenty-first capacitor (C21), the twenty-first capacitor (C21) is an electrolytic capacitor, the negative pole of the twenty-first capacitor (C21) is connected to the negative voltage output port (6-1-8), and the positive pole of the twenty-first capacitor (C21) is connected to the GND port (6-1-9).
9. A method of testing using the hand-held portable servo valve tester of any one of claims 1 to 8, comprising the steps of:
(1) according to the type of the tested servo valve, selecting to connect the tested servo valve with a handheld portable servo valve tester through the servo valve connector (1) or the valve core testing module (2);
(2) when a servo valve is tested through the servo valve connector (1), controlling enabling or disabling of a port of the servo valve connector (1) through the synchronous switch (8-1) of the servo valve connector port enabling module (8) according to parameters of the tested servo valve; the sliding switch (7-1) of the power supply switching module (7) is output through the servo valve connector to be switched to a power supply matched with the servo valve to be tested;
(3) adjusting to a required command signal range through the band switch (5-4-1) of the signal switching module (5-4);
(4) adjusting the potentiometer (5-4-2) of the signal switching module (5-4) to select a proper signal so as to perform corresponding test on the servo valve to be tested;
(5) in the test, the judgment is carried out according to the numerical value displayed by the signal acquisition display module (3), the signal parameter regulated by the potentiometer (5-4-2) of the signal switching module (5-4) and the F test jack of the valve core test module (2) connected with the tested servo valve or the F terminal feedback signal of the servo valve connector (1) connected with the tested servo valve, and then the analysis is carried out according to whether the load action of the tested servo valve can be reflected therewith, so that the performance of the tested servo valve is summarized and the fault is searched.
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CN111404493B (en) * 2020-04-26 2024-04-09 广东海洋大学 Electrohydraulic servo valve digital amplifier with safety protection and built-in test functions
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CN112834913B (en) * 2021-01-08 2024-04-26 胜达克半导体科技(上海)股份有限公司 High-voltage testing method for stacking tester channel

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CN105650062B (en) * 2016-04-14 2018-01-30 中冶赛迪工程技术股份有限公司 A kind of proportioning valve servo valve detecting system
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