CN101813109B - Servo valve test system - Google Patents
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Abstract
The invention relates to a servo valve test system. By adopting a cartridge valve to automatically switch static and dynamic oil lines, the servo valve test system can realize the full automatic one-step test and intelligent analysis of the static properties and the dynamic properties of an electro-hydraulic servo valve, improves the test efficiency of the electro-hydraulic servo valve, and increases the accuracy of the test results. Strictly based on the test standard of the electro-hydraulic servo valve GB/T15623-1995, the whole test method completes all the detection tests of the servo valve, and automatically displays and outputs the test results. The servo valve test system mainly comprises a hydraulic test system, an electrical control system and a data acquisition and processing system, wherein a servo valve to be tested is connected with the hydraulic test system and the electrical control system; a main oil line of the hydraulic test system is automatically switched to the dynamic oil line and the static oil line by a cartridge valve assembly, and the hydraulic test system is also provided with a dynamic cylinder for detecting the servo valve to be tested; and the data acquisition and processing system is connected with the electrical control system and the hydraulic test system.
Description
Technical field
The present invention relates to a kind of servo valve test system.
Background technique
Electrohydraulic servo-controlling system is widely used in key areas such as generating, metallurgy, Aero-Space, and electrohydraulic control is the core component of electrohydraulic servo-controlling system, is signal conversion element, is again power amplification element.Electrohydraulic control has combined the high-precision parts of machinery, electronics and hydraulics, combines the characteristics of electricity and hydraulic pressure two aspects, has a control accuracy height, speed of response is fast, signal processing is flexible, output power is big and advantage such as compact structure.Its performance quality directly has influence on control accuracy, stability and the reliability of electrohydraulic control system.
Because the high-precision property of electrohydraulic control and the key position in electrohydraulic servo-controlling system, the detection of servovalve are for the performance index that guarantee servovalve and guarantee that accurate, quick, the stable work of electrohydraulic servo system has important meaning.Every electrohydraulic control must carry out the strictness test to its parameter through various instrument before use, and whether check feature reaches relevant index, could guarantee the normal operation of servo-system like this.Unit that the servovalve consumption is big or important use occasion, the user should be provided with the servovalve test bench, so that the performance of new valve is checked, and used servovalve is regularly reviewed or comparative test.Test method mainly is divided into off-line test and on-line testing, and off-line test needs special test bench installation, and testing precision is high, is applicable to servovalve is comprehensively tested and adjustment.On-line testing is not separated at servovalve under the situation of original equipment carries out the operating mode inspection to it, though on-line testing is convenient, often receives the restriction of servovalve applications occasion, is not easy realization.
Summary of the invention
The object of the invention is exactly in order to address the above problem; A kind of advanced person's servo valve test system is provided; It adopts static, the dynamic oil circuit of cartridge valve automatic switchover, can realize the full-automatic disposable test and the intellectual analysis of electrohydraulic control static properties and dynamic performance, improves the efficient of electro-hydraulic servo valve test; Increase the degree of accuracy of test result; The strictness of whole measuring method for testing is according to the testing standard GB/T 15623-1995 of electrohydraulic control, and each item of accomplishing servovalve detects test, and shows automatically and the output test result.
For realizing above-mentioned purpose, the present invention adopts following technological scheme:
A kind of servo valve test system, it mainly is made up of hydraulic test system, electric control system and data Collection & Processing System, and tested servovalve connects with hydraulic test system and electric control system; Wherein, the working connection in the hydraulic test system automatically switches to dynamic oil circuit and static oil circuit through the cartridge valve group, in hydraulic test system, also is provided with the dynamic oil cylinder that tested servovalve is detected usefulness; Data Collection & Processing System and electric control system and hydraulic test system link.
Said hydraulic test system comprises working connection, control oil channel and oil pumping oil circuit, and they connect with corresponding three table oil pumps respectively, and whole hydraulic test system is made up of oil supply system and test platform, and tested servovalve is installed on the test platform; Wherein,
Working connection comprises basic oil circuit, static oil circuit and dynamic oil circuit:
The basis oil circuit comprises successively working connection oil suction oil purifier, working connection oil pump, the working connection filter-press that connects), one-way valve
I, working connection safety overflow valve, cooler, oil return oil purifier, the oil return oil purifier connects with fuel tank;
Static oil circuit comprises working connection oil suction oil purifier, working connection oil pump, working connection filter-press, the one-way valve I that connects successively; One-way valve I connects with the P mouth of tested servovalve; The A mouth of tested servovalve is connected with first cartridge valve of cartridge valve group, second cartridge valve; Second cartridge valve connects with T mouth, the 4th cartridge valve, oil return stop valve, cooler, the oil return oil purifier of proportional flow control valve, flowmeter, the 3rd cartridge valve, the B mouth of tested servovalve, tested servovalve successively, and the oil return oil purifier connects with fuel tank; Flowmeter connects with data Collection & Processing System;
Dynamically oil circuit comprises working connection oil suction oil purifier, working connection oil pump, working connection filter-press, the one-way valve I that connects successively; One-way valve I connects with the P mouth of tested servovalve; The A mouth of tested servovalve connects with first cartridge valve, and first cartridge valve connects with the left chamber of dynamic oil cylinder, and dynamically the right chamber of oil cylinder connects with the 5th cartridge valve; The 5th cartridge valve connects with the B mouth of tested servovalve; The T mouth of tested servovalve connects with the 4th cartridge valve, and the 4th cartridge valve connects with oil return stop valve, cooler, oil return oil purifier successively, and the oil return oil purifier connects with fuel tank;
The working connection filter-press also connects with an accumulator, is provided with an accumulator between working connection safety overflow valve and oil return stop valve;
Said control oil channel comprises: control basic oil circuit, servovalve pilot stage oil circuit, cartridge valve valve pilot stage oil circuit three parts; Wherein, Control basic oil circuit and comprise that the control oil channel oil suction oil purifier, control oil channel oil pump, control oil channel filter-press, one-way valve II, control oil channel safety overflow valve, cooler, the oil return oil purifier that connect successively connect the oil return oil purifier successively) connect with fuel tank;
Servovalve pilot stage oil circuit comprises successively the X mouth of the control oil channel oil suction oil purifier that connects, control oil channel oil pump, control oil channel filter-press, one-way valve II, series flow control valve, stop valve I, tested servovalve, and the Y mouth of tested servovalve directly returns fuel tank through stop valve II;
Cartridge valve valve pilot stage oil circuit comprises successively P mouth, the cartridge valve pilot stage solenoid valve of the control oil channel oil suction oil purifier that connects, control oil channel oil pump, control oil channel filter-press, cartridge valve pilot stage solenoid valve, the T mouth of cartridge valve pilot stage solenoid valve, the T mouth connected tank of cartridge valve pilot stage solenoid valve then;
Said oil pumping oil circuit comprises oil pumping road oil suction oil purifier, the oil pumping road binders pump that connects successively, and oil pumping road oil suction oil purifier connects with fuel tank, and oil pumping road binders pump connects with the recovery fuel tank; Reclaim fuel tank and be installed in test platform one side;
Fuel tank is provided with the fuel tank drain tap, and level meter and liquid thermometer and air-strainer are installed.
Said oil supply system comprises tank support; Fuel tank is installed on tank support; Cooler, air-strainer and oil return oil purifier are installed on the fuel tank, and level meter and liquid thermometer are installed on the fuel tank, and fuel tank also connects with working connection oil suction oil purifier and control oil channel oil suction oil purifier; Working connection oil suction oil purifier and control oil channel oil suction oil purifier connect with butterfly valve respectively, and butterfly valve then connects with oil circuit; In fuel tank, be provided with the integrated resistance and temperature transmitter of armouring; Fuel tank one side also is provided with working connection filter-press, control oil channel filter-press and two accumulators, and they connect with oil circuit; Working connection oil pump, control oil channel oil pump and oil pumping road binders pump then are installed in the bottom of oil supply system, and they connect with hose assembly, and hose assembly connects with oil circuit through the pressure regulator valve group.
Said test platform comprises test-bed, and tested servovalve is installed on test-bed, is provided with the recovery fuel tank in test-bed one side; On test platform, also be provided with one group of anti-pressure gauge that shakes, the anti-pressure gauge that shakes connects with the oil circuit that connects tested servovalve; Dynamic oil cylinder is installed below tested servovalve, and dynamically oil cylinder connects with tested servovalve through oil circuit, and dynamic oil cylinder also connects with control valve group A and control valve group B, and control valve group A connects with anti-pressure gauge and the tested servovalve of shaking respectively through the pressure measurement flexible pipe.
Said data Collection & Processing System comprises at least one velocity transducer, at least one displacement transducer, at least one pressure transducer, at least one data acquisition unit and data transfer and photoelectricity isolated system; Wherein, displacement transducer and velocity transducer are arranged on dynamic oil cylinder both sides and connect with data acquisition unit; Pressure transducer has six, on the oil circuit that wherein four are arranged on the cartridge valve group, remains two A mouth and B mouths that are located at tested servovalve, and connects with measuring cup respectively; Pressure transducer and flowmeter connect with data acquisition unit through data transfer and photoelectricity isolated system.
Said data transfer and photoelectricity isolated system comprise current-voltage signal conversion, eliminator and photoelectric isolating circuit; Wherein, the current-voltage signaling conversion circuit is a resistance R 2, and it is parallelly connected with capacitor C 1, and the electric current of importing is become 2～10V voltage signal; Eliminator is the RC eliminator of resistance R 1 and capacitor C 1 composition, and this circuit suppresses the above high-frequency signal of 1.6KHz to be disturbed; Photoelectric isolating circuit comprises numeral input optical coupling isolation circuit, and it sends into data collecting card after input signal is handled, and data collecting card output signal is through numeral output optical coupling isolation circuit control cartridge valve group.
Said tested servovalve connects with electric control system through servoamplifier.
Said data acquisition unit is for adopting the multifunctional data acquisition card of pci bus.
Said electric control system is electrical control cabinet and principal controller.
The invention has the beneficial effects as follows:
(1) adopts cartridge valve as the oil circuit switching control valve first, make whole system have automatically, respond fast, excellent properties such as flow is big.Through the switching of solenoid directional control valve control cartridge valve, and the electrical control signal of solenoid directional control valve is exported by data collecting card.Use the cartridge valve cover plate of different model in the system, had the function that single valve is controlled single oil circuit and single valve control heavy wool road.
(2) thought that servovalve static properties and dynamic performance are once tested is proposed first.Present domestic and international existing servo valve test system is all tested oil circuit with static properties and is separated with the dynamic performance testing oil circuit, need tested valve dismounting and change in two oil circuits not only be needed to shut down, and can lose hydraulic oil during test.This paper succeeds in developing the fully-automatic intelligent test and the fault diagnostic test platform of the static and dynamic once mounting test of servovalve completion, uses static, the dynamic oil circuit of cartridge valve automatic switchover, has simplified testing procedure and has improved the system automation degree.
(3) realized two kinds of detection modes for internal leakage fault diagnosis aspect: under the less situation of internal leakage, select the measuring cup metering system, behind the output signal of a servovalve of every setting, the leakage oil mass of the counting cup meter under the T mouth in the unit time; Under the bigger situation of interior flow, select the flowmeter survey mode; At first cartridge valve is opened internal leakage and is detected oil circuit; Software changes the output signal of supplying with servovalve automatically, and under each signal, writes down leakage flow, draws out complete leakage flow curve at last automatically.
(4) relief valve of all uses, Flow valve, sensor etc. all adopt board-like connection in the system; Designed a plurality of Stainless Steel Valve pieces, the pipeline of having simplified system greatly connects, and effectively reduces the vibrations of system; Reduce system's floor space, improved the reliability of whole system.
(5) the testing and diagnosing analysis software of design has functions such as self-protection, full-automatic testing, intellectual analysis.Carry out in real time automatic policer operation step in the process in each test, then refuse to carry out, system is locked protection automatically and jumps out warning prompt if any misoperation.Only need click mouse several times in each test, program can be accomplished test automatically, and calculate Pressure gain, the linearity automatically, performance parameter values such as ring, flow gain stagnate.
(6) test diagnosis system has the high speed acquisition analogue signal and refreshes the performance of analog amount output at a high speed, and frequency sound test is realized through computed in software by data collecting card, do not needed other configuration signal generator and Frequency Response Analysis appearance.
Description of drawings
Fig. 1 is a system block diagram of the present invention;
Fig. 2 is oil channel structures figure of the present invention
Fig. 3 a is the oil supply system structural representation;
Fig. 3 b is the lateral plan of Fig. 3 a;
Fig. 3 c is the plan view of Fig. 3 a;
Fig. 3 d is the lower view of Fig. 3 a;
The structural representation of Fig. 4 a test bench;
Fig. 4 b is the lateral plan of Fig. 4 a;
Fig. 4 c is the plan view of Fig. 4 a;
Fig. 4 d is the lower view of Fig. 4 a;
Fig. 5 is current-voltage signal conversion and RC filtering principle figure;
Fig. 6 a is a numeral input light-coupled isolation schematic diagram;
Fig. 6 b is a numeral output light-coupled isolation schematic diagram.
Wherein, 1-displacement transducer; 2-dynamically oil cylinders; 3-velocity transducer; 4-proportional flow control valve; 5-flowmeter; 6-1-first cartridge valve; 6-2-second cartridge valve; 6-3-the 3rd cartridge valve; 6-4-the 4th cartridge valve; 6-5-the 5th cartridge valve; 7-pressure transducer; 8-measuring cup; 9-tested servovalve; 10-proportional pressure control valve; 11-series flow control valve; 12-oil return stop valve; 13-recovery fuel tank; 14-working connection safety overflow valve; 15-accumulator; 16-control oil channel filter-press; 17-control oil channel oil pump; 18-control oil channel oil suction oil purifier; 19-working connection filter-press; 20-working connection oil pump; 21-working connection oil suction oil purifier; 22-cooler; 23-oil return oil purifier; 24-level meter; 25-air-strainer; 26-liquid thermometer; 27-oil pumping road binders pump; 28-oil pumping road oil suction oil purifier; 29-fuel tank; 30-fuel tank drain tap; 31-one-way valve I; 32-hydraulic test system; 33-electric control system; 34-data Collection & Processing System; 35-oil supply system; 36-test platform; 37-one-way valve II; 38-control oil channel safety overflow valve; 39-tank support; 40-hose assembly; 41-electrical control cabinet; 42-butterfly valve; The integrated resistance and temperature transmitter of 43-armouring; 44-test-bed; 45-anti-the pressure gauge that shakes; 46-servoamplifier; 47-stop valve I; 48-stop valve II; 49-cartridge valve pilot stage solenoid valve; 50-principal controller; 51-control valve group A; 52-control valve group B; 53-data collecting card; 54-data transfer and photoelectricity isolated system; 55-pressure measurement flexible pipe.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Among Fig. 1, it mainly is made up of hydraulic test system 32, electric control system 33 and data Collection & Processing System 34, and tested servovalve 9 connects with hydraulic test system 32; Wherein, the working connection in the hydraulic test system 32 is dynamic oil circuit and static oil circuit through the cartridge valve component, in hydraulic test system 32, also is provided with the dynamic oil cylinder 2 of tested servovalve 9 being tested usefulness; Data Collection & Processing System 34 connects with hydraulic test system 32.Each item that this system can accomplish among the GB/T 15623-1995 (electrohydraulic control test method) detects test, like partially zero and drift test, internal leakage test, no load discharge test, flow load pressure drop test, transient response test etc.
Among Fig. 2, hydraulic test system 32 comprises working connection, control oil channel and oil pumping oil circuit, and they connect with corresponding three table oil pumps respectively, and whole hydraulic test system 32 is divided into oil supply system 35 and test platform 36 again, and tested servovalve 9 is installed on the test platform 36; Wherein,
Working connection comprises basic oil circuit, static oil circuit and dynamic oil circuit:
The basis oil circuit comprises working connection oil suction oil purifier 21, working connection oil pump 20, working connection filter-press 19, one-way valve I31, working connection safety overflow valve 14, cooler 22, the oil return oil purifier 23 that connects successively, and oil return oil purifier 23 connects with fuel tank 29;
Static oil circuit comprises working connection oil suction oil purifier 21, working connection oil pump 20, working connection filter-press 19, the one-way valve I31 that connects successively; One-way valve I31 connects with the P mouth of tested servovalve 9; The A mouth of tested servovalve 9 is connected with the first cartridge valve 6-1, the second cartridge valve 6-2; The second cartridge valve 6-2 connects with B mouth, the T mouth of tested servovalve 9, the 4th cartridge valve 6-4, oil return stop valve 12, cooler 22, the oil return oil purifier 23 of proportional flow control valve 4, flowmeter 5, the 3rd cartridge valve 6-3, tested servovalve 9 successively, and oil return oil purifier 23 connects with fuel tank 29; Flowmeter 5 connects with data Collection & Processing System 34;
Dynamically oil circuit comprises working connection oil suction oil purifier 21, working connection oil pump 20, working connection filter-press 19, the one-way valve I31 that connects successively; One-way valve I31 connects with the P mouth of tested servovalve 9; The A mouth of tested servovalve 9 connects with the first cartridge valve 6-1, and the first cartridge valve 6-1 connects with dynamic oil cylinder 2 left chambeies, and dynamically oil cylinder 2 right chambeies connect with the 5th cartridge valve 6-5; The 5th cartridge valve 6-5 connects with the B mouth of tested servovalve 9; The T mouth of tested servovalve 9 connects with the 4th cartridge valve 6-4, and the 4th cartridge valve 6-4 connects with oil return stop valve 12, cooler 22, oil return oil purifier 23 successively, and oil return oil purifier 23 connects with fuel tank 29;
Working connection filter-press 19 also connects with an accumulator 15, and 12 of working connection safety overflow valve 14 and oil return stop valves are provided with another accumulator 15;
Said control oil channel comprises: control basic oil circuit, servovalve pilot stage oil circuit, cartridge valve valve pilot stage oil circuit three parts; Wherein, Control basic oil circuit and comprise that the control oil channel oil suction oil purifier 18, control oil channel oil pump 17, control oil channel filter-press 16, one-way valve II37, control oil channel safety overflow valve 38, cooler 22, the oil return oil purifier 23 that connect successively connect successively, oil return oil purifier 23 connects with fuel tank 29;
Servovalve pilot stage oil circuit comprises successively the X mouth of the control oil channel oil suction oil purifier 18 that connects, control oil channel oil pump 17, control oil channel filter-press 16, one-way valve II37, series flow control valve 11, stop valve I47, tested servovalve 9, and the Y mouth of tested servovalve 9 directly returns fuel tank 29 through stop valve II48;
Cartridge valve valve pilot stage oil circuit comprises successively P mouth, the cartridge valve pilot stage solenoid valve 49 of the control oil channel oil suction oil purifier 18 that connects, control oil channel oil pump 17, control oil channel filter-press 16, cartridge valve pilot stage solenoid valve 49, the T mouth of cartridge valve pilot stage solenoid valve 49, the T mouth connected tank 29 of cartridge valve pilot stage solenoid valve 49 then;
Said oil pumping oil circuit comprises oil pumping road oil suction oil purifier 28, the oil pumping road binders pump 27 that connects successively, and oil pumping road oil suction oil purifier 28 connects with fuel tank 29, and oil pumping road binders pump 27 connects with recovery fuel tank 13; Reclaim fuel tank 13 and be installed in test platform 36 1 sides;
Among Fig. 3 a, Fig. 3 b, Fig. 3 c and Fig. 3 d; Oil supply system 35 comprises tank support 39, and fuel tank 29 is installed on tank support 39, and cooler 22, air-strainer 25 and oil return oil purifier 23 are installed on the fuel tank 29; Level meter 24 is installed on the fuel tank 29 with liquid thermometer 26; Fuel tank 29 also connects with working connection oil suction oil purifier 21 and control oil channel oil suction oil purifier 18, and working connection oil suction oil purifier 21 and control oil channel oil suction oil purifier 18 connect with butterfly valve 42 respectively, and 42 of butterfly valves connect with oil circuit; In fuel tank 29, be provided with the integrated resistance and temperature transmitter 43 of armouring; Fuel tank 29 1 sides also are provided with working connection filter-press 19, control oil channel filter-press 16 and two accumulators 15, and they connect with oil circuit; Working connection oil pump 20, control oil channel oil pump 17 and oil pumping road binders pump 27 then are installed in the bottom of oil supply system 35, and they connect with hose assembly 40, and hose assembly 40 connects with oil circuit through the pressure regulator valve group.
Among Fig. 4 a, Fig. 4 b, Fig. 4 c, Fig. 4 d, test platform 36 comprises test-bed 44, and tested servovalve 9 is installed on test-bed 44, is provided with in test-bed 44 1 sides and reclaims fuel tank 13; On test platform 36, also be provided with one group of anti-pressure gauge 45 that shakes, the anti-pressure gauge 45 that shakes connects with the oil circuit that connects tested servovalve 9; Dynamic oil cylinder 2 is installed below tested servovalve 9; Dynamically oil cylinder 2 connects with tested servovalve 9; Dynamically oil cylinder 2 both sides are provided with displacement transducer 1 and velocity transducer 3; Dynamically oil cylinder 2 also connects with control valve group A51 and control valve group B52, and control valve group A51 connects with tested servovalve 9 with the anti-pressure gauge 45 that shakes respectively through pressure measurement flexible pipe 55.
Data Collection & Processing System 34 comprises a velocity transducer 3, displacement transducer 1, six pressure transducers 7, data collecting device and a data transfer and a photoelectricity isolated system 54; Wherein, displacement transducer 1 is arranged on dynamic oil cylinder 2 both sides with velocity transducer 3 and connects with data acquisition unit; In the pressure transducer 7 four are arranged on the oil circuit of cartridge valve group, remain two and are located at the A of tested servovalve 9 mouth and B mouth, and connect with measuring cup 8 respectively; Pressure transducer 7 connects with data acquisition unit through data transfer and photoelectricity isolated system 54 with flowmeter 5.
Data transfer and photoelectricity isolated system 54 comprise current-voltage signal conversion, eliminator and photoelectric isolating circuit; Among Fig. 5, the current-voltage signaling conversion circuit is a resistance R 2, and it is parallelly connected with capacitor C 1, and the electric current of importing is become 2～10V voltage signal;
Because current signal has long transmission distance, the advantage that antijamming capability is strong, the sensor major part of using in the test system is the current signal output type, output current 4～20mA.And data collecting card 53 can only receive-10V～+ voltage signal between the 10V, therefore need carry out the current-voltage signal conversion.Behind the current signal process precision resistance R2 (resistance 0.5K, precision 0.1%) of input, become 2～10V voltage signal, can be converted into digital signal through data collecting card 53.
Eliminator is the RC eliminator of resistance R 1 and capacitor C 1 composition, and this circuit suppresses the above high-frequency signal of 1.6KHz to be disturbed; High-frequency noise disturbs the influence to analogue signal under the surrounding environment in order to suppress, and has adopted simple and effective RC eliminator.As shown in Figure 5, the R1 resistance is 10K, C1 capacitance 0.01uF, and substitution lower pass-filter formula obtains, and this circuit can suppress the above high-frequency signal of 1.6KHz to be disturbed.
Among Fig. 6 a, Fig. 6 b, photoelectric isolating circuit comprises numeral input optical coupling isolation circuit, and it sends into data collecting card after input signal is handled, and data collecting card output signal is through numeral output optical coupling isolation circuit control cartridge valve group.
Need to detect the alarm signal of each oil purifier and filter-press in this test system, signal is the digital switch quantity signal of 24V, for avoiding that the 5V level end of capture card part is produced interference, has carried out the optical coupling isolation circuit design, and principle is shown in Fig. 6 a.Need in this automatic checkout system through 24V level signal control solenoid directional control valve and electromagnetic relief valve, so the 5V switch level signal of capture card output can not directly drive valve, thus digital output optical coupling isolation circuit adopted, shown in Fig. 6 b.
Tested servovalve 9 connects with electric control system 33 through servoamplifier 46.Servoamplifier provides to servovalve and satisfies static and the required various drive signals of dynamic characteristic test, and the chatter signal is provided, and prevents that servovalve is stuck.Native system is selected the G122-824-002 type servoamplifier of MOOG company for use, and it is universal servoamplifier, can be with closed loop control systems such as the good position of electrohydraulic control and oil cylinder component property, speed, flows.
Data acquisition unit is for adopting the multifunctional data acquisition card 53 of pci bus.
Data acquisition unit is for adopting the multifunctional data acquisition card of pci bus.The traditional data capture card generally adopts isa bus, and adopts the appearance of the data capture product of pci bus control technique to improve the performance of data acquisition control scheme now.The pci bus theory can reach the transmission speed of 132Mb/s; In addition because PCI supports " Plug & Play " configuration feature automatically; The setting of all resource requirements of data collecting card is operated in and transfers to the BIOS processing when system just opens, and need not the user carry out switch and wire jumper operation, disposes very convenient.Through to many moneys capture card of many companies relatively and combine the each side requirement of this test system, the PCI-6229 multifunctional data acquisition card of America NI company is selected in decision for use.
The major parameter of PCI-6229 is following:: 32 tunnel 16 precision A/D passages, the maximum sample frequency 250KS/s of single channel, input maximum voltage range-10V-+10V; 4 tunnel 16 precision D/A passages, the maximum output frequency 833KS/s of single channel, output maximum voltage range-10V-+10V; 2 tunnel 32 bit timing counters, internal timebase 80MHz; 48 way word I/O passages.Integrated circuit board has 4KFIFO in addition, and support software triggers, the integrated circuit board programmable timer triggers and three kinds of modes of external trigger, supports inquiry, interruption and three kinds of data transfer modes of DMA.
Terminal board is selected the CB-68LP of NI company for use.Boundary dimension 14.35 * 10.74cm, 68 terminals.Tie cable is selected the SHC68-68-EPM shielded cable of NI company for use, and these cable two ends have the connector of one 68 core respectively, links to each other with terminal board with data collecting card respectively.
The pressure transducer 7 that this test system adopts is ES400J type pressure transmitters, output 4～20mA current signal.Have characteristics such as precision height, long time stability are good, good reliability; The stainless steel casing encapsulation, advantages of small volume, easy for installation, can measure various liquids and gases.Its each technical order satisfies the requirement of this test system.
The flux test of electrohydraulic control and the flux test of other hydraulic element are different; This mainly shows: the one, in the flow measurement of oil hydraulic pump, oil hydraulic motor and common hydrovalve, generally do not require its direction of test; Only require the size of test traffic, and the flow of servovalve is wanted detected magnitude and direction simultaneously; The 2nd, in the no load discharge pressure drop test, the flux test of servovalve is to carry out under the low-down condition of induced pressure in " zero load ", so flowmeter must have extremely low breakout pressure; The 3rd, flowmeter must be high pressure resistant.This test system is selected German VSE gear meter for use, makes flux signal be converted into electrical pulsing signal, by microcomputer processing, has realized test automation behind signal process optical coupling isolation circuit to the data collecting card.Two pulse signals output, corresponding 500 pulses of every up-flow amount.
Velocity transducer and displacement transducer:
When carrying out the electrohydraulic servo valve dynamic performance test, the output flow of electrohydraulic control gets into the oil pocket that quality is little, hang down the dynamic oil cylinder of friction.The speed of oil cylinder is directly proportional with the flow of electrohydraulic control output, and the speed of oil cylinder then detects through the velocity transducer that piston rod one end drives, and therefore 4～20mA current signal of output is the flux signal of tested valve.
Because tested servovalve exists original zero partially in the process of the test; It is inconsistent that reasons such as tolerance fit when dynamically oil cylinder is owing to processing and assembling cause oil cylinder two chambeies to leak; Between piston and the cylinder barrel in the left and right sides factor such as frictional force is asymmetric during to-and-fro motion, when system under the excitation of sine sweep signal, can depart from its original neutral position when piston moves reciprocatingly gradually; Until bumping against an end, test can't be carried out at last.In testing apparatus, increased by a cover position closed loop centering system for this reason, added a displacement transducer, be used as the Detecting element that piston departs from the oil cylinder meta at the other end of oil cylinder piston bar.Before each sweep sine output, earlier through this position closed loop system adjustment piston to oil cylinder meta.
Temperature transducer
Used two temperature transducers in the system, wherein one is armour shape integrated temperature sensor, is installed in the fuel tank, is used for detecting oil temperature in the fuel tank, test specification-50～100 ℃.Other one is the ES500 type temperature transducer that Shaanxi Qin Ming sensor Co., Ltd produces, be installed in Stainless Steel Valve fast on, be used for detecting the oil temperature of servovalve filler opening, 0～100 ℃ of test specification.
The Anti-interference Design of test system:
In test site, because controlled device is distributed in different places with measured signal, computer and the distance of quite growing is also arranged between them; There is heavy current installation at the scene in addition, and their startup and working procedure produce strong interference to computer.Magnetic field that produces like motor and other electrical equipment and various electromagenetic wave radiations etc., the existence of these electromagnetic fields and variation make test system electrical interference occur, the distorted signals of signaling line and guide line transmission.As do not take interference protection measure, computer can't be used for test system.According to the actual conditions of native system, the interference protection measure of taking mainly contains 2 points:
(1) ground connection design.Ground wire in the testing apparatus is the public zero-level reference points of all circuit; The level of ground wire should be identical in theory; Because of connecting with lead between the each point; So when lead two ends during difference ground connection, because the lead internal resistance causes 2 potential differences non-vanishing, this will influence the input and output of circuit.For overcoming this influence, the casing of all parts in the test system is ground connection on one point, and with digitally keeping apart with simulation ground in the circuit, suppress the interference of digital signal to analogue signal.
(2) adopt Shielding Design.Owing to need in the measuring system to gather a plurality of signal sources, signal can produce noise interference, long line transmission interference etc. when transmitting through electric wire (signalling channel).So the interference that system has adopted shielding wire to come erasure signal, the shielded cable layer ground signalling of shielding wire.
The principal controller of native system is a platform with LabVIEW8.5, utilizes its powerful signal analysis and processing function, and programming realizes virtual signal generator; Signal is changed output action to electrohydraulic control through D/A; Relevant signal carries out signal conversion through sensor, nurses one's health into standard signal through signal conditioning circuit again and converts digital signal to through A/D, and on the LabVIEW platform, signal carried out digitized processing such as smoothing windows, digital filtering, gamma correction and demarcation; Its static characteristic and dynamic characteristic are analyzed; Analysis result shows with the form output of graphical curve, preserves data simultaneously in the test automatically, and generates test report.Duration of test, the signal waveform that signal source produces and the signal of collection in worksite, all the software panel through virtual instrument shows in real time on display device.Calculate the various performance parameters of servovalve according to sensor signal.Set up the test record database, preserved test result according to the sequence number that dispatches from the factory of servovalve.According to the quiet dynamic characteristic test requirement of electrohydraulic control, system is divided into static characteristic test and dynamic characteristic test two-part.The main completion of static characteristic test electrohydraulic control load flow characteristic, no load discharge characteristic, Pressure characteristics, internal leakage characteristic test; Dynamic characteristic test is mainly accomplished electrohydraulic control transient response and frequency response test.
Claims (9)
1. servo valve test system; It is characterized in that; It mainly is made up of hydraulic test system (32), electric control system (33) and data Collection & Processing System (34), and tested servovalve (9) connects with hydraulic test system (32) and electric control system (33); Wherein, Working connection in the hydraulic test system (32) automatically switches to dynamic oil circuit and static oil circuit through the cartridge valve group; Static oil circuit comprises working connection oil suction oil purifier (21), working connection oil pump (20), working connection filter-press (19), the one-way valve I (31) that connects successively; One-way valve I (31) connects with the P mouth of tested servovalve (9); First cartridge valve (6-1) that has cartridge valve pilot stage solenoid valve (49) of the A mouth of tested servovalve (9) and cartridge valve group, second cartridge valve (6-2) that has a cartridge valve pilot stage solenoid valve (49) are connected; Second cartridge valve (6-2) connects with the T mouth of proportional flow control valve (4), flowmeter (5), the 3rd cartridge valve (6-3), the B mouth of tested servovalve (9), tested servovalve (9), the 4th cartridge valve (6-4) that has cartridge valve pilot stage solenoid valve (49), oil return stop valve (12), cooler (22), oil return oil purifier (23) successively, and oil return oil purifier (23) connects with fuel tank (29); Flowmeter (5) connects with data Collection & Processing System (34);
Dynamically oil circuit comprises working connection oil suction oil purifier (21), working connection oil pump (20), working connection filter-press (19), the one-way valve I (31) that connects successively; One-way valve I (31) connects with the P mouth of tested servovalve (9); The A mouth of tested servovalve (9) connects with the left chamber of dynamic oil cylinder (2) through first cartridge valve (6-1) that has cartridge valve pilot stage solenoid valve (49); Dynamically the right chamber of oil cylinder (2) connects with the 5th cartridge valve (6-5); The 5th cartridge valve (6-5) connects with the B mouth of tested servovalve (9); The T mouth of tested servovalve (9) connects with the 4th cartridge valve (6-4) that has cartridge valve pilot stage solenoid valve (49); The 4th cartridge valve (6-4) that has cartridge valve pilot stage solenoid valve (49) connects with oil return stop valve (12), cooler (22), oil return oil purifier (23) successively, and oil return oil purifier (23) connects with fuel tank (29); In hydraulic test system (32), also be provided with the dynamic oil cylinder (2) that tested servovalve (9) is detected usefulness; Data Collection & Processing System (34) links with electric control system (33) and hydraulic test system (32).
2. servo valve test system as claimed in claim 1; It is characterized in that; Said hydraulic test system (32) comprises working connection, control oil channel and oil pumping oil circuit; They connect with corresponding three table oil pumps respectively, and whole hydraulic test system (32) is made up of oil supply system (35) and test platform (36), and tested servovalve (9) is installed on the test platform (36); Wherein,
Working connection comprises basic oil circuit, static oil circuit and dynamic oil circuit:
The basis oil circuit comprises working connection oil suction oil purifier (21), working connection oil pump (20), working connection filter-press (19), one-way valve I (31), working connection safety overflow valve (14), cooler (22), the oil return oil purifier (23) that connects successively, and oil return oil purifier (23) connects with fuel tank (29);
The working connection filter-press also connects with an accumulator (15), is provided with an accumulator (15) between working connection safety overflow valve (14) and oil return stop valve (12);
Said control oil channel comprises: control basic oil circuit, servovalve pilot stage oil circuit, cartridge valve valve pilot stage oil circuit three parts; Wherein, Control basic oil circuit and comprise that the control oil channel oil suction oil purifier (18), control oil channel oil pump (17), control oil channel filter-press (16), one-way valve II (37), control oil channel safety overflow valve (38), cooler (22), the oil return oil purifier (23) that connect successively connect successively, oil return oil purifier (23) connects with fuel tank (29);
Servovalve pilot stage oil circuit comprises successively the X mouth of the control oil channel oil suction oil purifier (18) that connects, control oil channel oil pump (17), control oil channel filter-press (16), one-way valve II (37), series flow control valve (11), stop valve I (47), tested servovalve (9), and the Y mouth of tested servovalve (9) directly returns fuel tank (29) through stop valve II (48);
Cartridge valve pilot stage oil circuit comprises successively P mouth, the cartridge valve pilot stage solenoid valve (49) of the control oil channel oil suction oil purifier (18) that connects, control oil channel oil pump (17), control oil channel filter-press (16), cartridge valve pilot stage solenoid valve (49), the T mouth of cartridge valve pilot stage solenoid valve (49), the T mouth connected tank (29) of cartridge valve pilot stage solenoid valve (49) then;
Said oil pumping oil circuit comprises oil pumping road oil suction oil purifier (28), the oil pumping road binders pump (27) that connects successively, and oil pumping road oil suction oil purifier (28) connects with fuel tank (29), and oil pumping road binders pump (27) connects with recovery fuel tank (13); Reclaim fuel tank (13) and be installed in test platform (36) one sides;
Fuel tank (29) is provided with fuel tank drain tap (30), and level meter (24) and liquid thermometer (26) and air-strainer (25) are installed.
3. servo valve test system as claimed in claim 2; It is characterized in that; Said oil supply system (35) comprises tank support (39), goes up at tank support (39) fuel tank (29) is installed, and fuel tank (29) is gone up cooler (22), air-strainer (25) and oil return oil purifier (23) are installed; Level meter (24) and liquid thermometer (26) are installed on the fuel tank (29); Fuel tank (29) also connects with working connection oil suction oil purifier (21) and control oil channel oil suction oil purifier (18), and working connection oil suction oil purifier (21) and control oil channel oil suction oil purifier (18) connect with butterfly valve (42) respectively, and butterfly valve (42) then connects with oil circuit; In fuel tank (29), be provided with the integrated resistance and temperature transmitter of armouring (43); Fuel tank (29) one sides also are provided with working connection filter-press (19), control oil channel filter-press (16) and two accumulators (15), and they connect with oil circuit; Working connection oil pump (20), control oil channel oil pump (17) and oil pumping road binders pump (27) then are installed in the bottom of oil supply system (35), and they connect with hose assembly (40), and hose assembly (40) connects with oil circuit through the pressure regulator valve group.
4. servo valve test system as claimed in claim 2; It is characterized in that; Said test platform (36) comprises test-bed (44), and tested servovalve (9) is installed on test-bed (44), is provided with in test-bed (44) one sides and reclaims fuel tank (13); On test platform (36), also be provided with one group of anti-pressure gauge that shakes (45), the anti-pressure gauge that shakes (45) connects with the oil circuit that connects tested servovalve (9); In the below of tested servovalve (9) dynamic oil cylinder (2) is installed; Dynamically oil cylinder (2) connects with tested servovalve (9) through oil circuit; Dynamically oil cylinder (2) also connects with control valve group A (51) and control valve group B (52), and control valve group A (51) connects with anti-pressure gauge that shakes (45) and tested servovalve (9) respectively through pressure measurement flexible pipe (55).
5. like claim 1 or 2 or 4 described servo valve test systems; It is characterized in that said data Collection & Processing System (34) comprises at least one velocity transducer (3), at least one displacement transducer (1), at least one pressure transducer (7), at least one data acquisition unit and data transfer and photoelectricity isolated system (54); Wherein, displacement transducer (1) and velocity transducer (3) are arranged on dynamic oil cylinder (2) both sides and connect with data acquisition unit; Pressure transducer (7) has six, on the oil circuit that wherein four are arranged on the cartridge valve group, remains two A mouth and B mouths that are located at tested servovalve (9), and connects with measuring cup (8) respectively; Pressure transducer (7) and flowmeter (5) connect with data acquisition unit through data transfer and photoelectricity isolated system (54).
6. servo valve test system as claimed in claim 5 is characterized in that, said data transfer and photoelectricity isolated system (54) comprise current-voltage signal conversion, eliminator and photoelectric isolating circuit; Wherein, the current-voltage signaling conversion circuit is a resistance R 2, and it is parallelly connected with capacitor C 1, and the electric current of importing is become 2 ~ 10V voltage signal; Eliminator is the RC eliminator of resistance R 1 and capacitor C 1 composition, and this circuit suppresses the above high-frequency signal of 1.6KHz to be disturbed; Photoelectric isolating circuit comprises numeral input optical coupling isolation circuit, and it sends into data collecting card after input signal is handled, and data collecting card output signal is through numeral output optical coupling isolation circuit control cartridge valve group.
7. servo valve test system as claimed in claim 1 is characterized in that, said tested servovalve (9) connects with electric control system (33) through servoamplifier (46).
8. servo valve test system as claimed in claim 5 is characterized in that, said data acquisition unit is for adopting the multifunctional data acquisition card (53) of pci bus.
9. like claim 1 or 7 described servo valve test systems, it is characterized in that said electric control system (33) is electrical control cabinet (41) and principal controller (50).
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