CN107478531B - High-speed high-pressure friction and wear experiment platform and electrohydraulic control system thereof - Google Patents
High-speed high-pressure friction and wear experiment platform and electrohydraulic control system thereof Download PDFInfo
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- CN107478531B CN107478531B CN201710785494.2A CN201710785494A CN107478531B CN 107478531 B CN107478531 B CN 107478531B CN 201710785494 A CN201710785494 A CN 201710785494A CN 107478531 B CN107478531 B CN 107478531B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention discloses a high-speed high-pressure friction and wear experiment platform and an electrohydraulic control system thereof, which comprise an experiment platform mechanism, a hydraulic system and an electric control system, wherein the experiment platform mechanism comprises a case shell, the upper end part of the case shell is provided with a case upper end cover, the outer side wall of an opening of the case upper end cover is provided with a hub bearing, the outer side of the hub bearing is sleeved with a belt hub, and the outer side of the belt hub is sleeved with a belt; the hydraulic system comprises a second speed regulating valve connected with the main shaft cooling component, and the other end of the second speed regulating valve is connected with a pressure reducing valve; the electric control system comprises a main circuit and a PLC control circuit. The invention can realize the friction and wear performance test in different medium environments and also can realize the friction and wear performance test under different rotating speeds and different loads, and greatly improves the adaptability of the rotating speed and the load of the experimental platform due to the adoption of a hydraulic cooling technology and a variable frequency speed regulating technology.
Description
Technical Field
The invention relates to the technical field of high-speed high-pressure friction and wear experiment platforms, in particular to a high-speed high-pressure friction and wear experiment platform and an electrohydraulic control system thereof.
Background
Friction wear test, a material test for determining the ability of a material to resist wear, by which the wear resistance of the material can be compared. The abrasion test is more complicated than the conventional material test. Firstly, considering specific working conditions of parts and determining a wear form, and then selecting a proper test method so as to enable a test result to be matched with an actual result, wherein the wear form comprises abrasive wear, adhesive wear, contact fatigue wear, fretting wear, cavitation and the like. However, under practical operating conditions, more than one form of wear often occurs, for example, high-power diesel engine bushings may exhibit both adhesive wear and cavitation. Wear tests are more affected by factors such as load, speed, temperature, surrounding medium, surface roughness, lubrication and coupling materials than others. The test conditions are consistent with the actual conditions as much as possible, so that the reliability of the test result can be ensured, the current friction and wear test equipment has high manufacturing cost, and more importantly, the connection mode of the upper friction piece clamp and the main shaft cannot be used for transmitting larger rotating speed, the upper friction piece and the clamp rotate relatively, and the measuring result of the rotating speed is influenced to a certain extent; in addition, the common friction and wear experiment platform generally adopts a loading mode of a screw nut and a variable-frequency speed regulation mode, so that the rotating speed and the adaptive capacity of the load are not strong, and the requirements of high-speed high-pressure friction and wear performance test cannot be met.
Disclosure of Invention
The invention aims to solve the problems that the detection effect is not good enough and the requirements of high-speed high-pressure friction and wear performance test cannot be met in the prior art, and provides a high-speed high-pressure friction and wear experimental platform and an electrohydraulic control system thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a high-speed high-pressure friction wear experiment platform and electrohydraulic control system thereof, including experiment platform mechanism, hydraulic system and electrical system, experiment platform mechanism includes chassis housing, chassis housing's upper end is equipped with box upper end cover, install two hub bearings on the lateral wall of box upper end cover's opening part, hub bearing's outside cover is equipped with belt wheel hub, hub's outside cover is equipped with the belt, the one end that the belt kept away from belt wheel hub is connected with first motor, be equipped with the belt pulley axis of rotation with belt rotation connection on the first motor, belt wheel hub's upper end is equipped with the sleeve, the telescopic upside is equipped with fastening round nut, the middle part cartridge that has fastening round nut has the main shaft, the main shaft runs through sleeve, belt wheel hub and extends to chassis housing's inside, the junction of box upper end cover and chassis housing is through a plurality of fastening hexagonal nuts, be equipped with the big bearing of being connected with the main shaft on the inside wall of chassis housing opening part, the downside of big bearing is equipped with the main shaft cooling part, be equipped with the main shaft cooling part between main shaft cooling part and the big bearing, be equipped with the sealing washer between main shaft cooling part and the big bearing, the friction device is equipped with the friction device on the side of the friction container, the friction device is equipped with the friction device that takes place on the bottom the container, the friction device is equipped with the friction device that is equipped with the friction device, the base is also provided with a jack-prop, the jack-prop is contacted with a pressure sensor arranged on the machine body in the friction test process, the lower side of the base is provided with a plurality of base centering bearings, the lower side of the base is also provided with a connecting support piece, a base supporting bearing is arranged between the connecting support piece and the base, the middle part of the connecting support piece is provided with a base connecting shaft, the lower side of the connecting support piece is provided with a loading piston, the base connecting shaft is also connected with the loading piston, the lower surface of the machine case shell is provided with a box lower end cover, and the middle part of the box lower end cover is provided with a hydraulic loading oil inlet; the lower friction piece is not arranged below the upper friction piece, the lower friction piece and the upper friction piece are not contacted at ordinary times, and only under the action of a loading system, the upper friction piece moves downwards to be contacted with the lower friction piece, so that friction is generated.
The hydraulic system comprises a speed regulating valve II connected with a main shaft cooling component, the other end of the speed regulating valve II is connected with a pressure reducing valve, one end of the speed reducing valve, which is far away from the main shaft cooling component, is respectively connected with a fine filter, a pressure gauge, an overflow valve and a sequence valve, one end of the sequence valve, which is far away from the pressure reducing valve, is respectively connected with a three-position three-way electromagnetic reversing valve and a three-position four-way electromagnetic reversing valve, one end of the three-position three-way electromagnetic reversing valve, which is far away from the sequence valve, is connected with a speed regulating valve I, one end of the three-position four-way electromagnetic reversing valve, which is far away from the sequence valve, is connected with a pressure relay and a hydraulic cylinder, one end of the fine filter, which is far away from the pressure reducing valve, is provided with an external gear pump, and the external gear pump is connected with a second motor through a toothed elastic coupling;
the electric control system comprises a main circuit and a PLC control circuit, wherein the main circuit comprises a motor M1, a motor M2, a three-phase frequency converter output filter, a three-phase power supply EMI filter, a frequency converter, a zero-phase reactor and a circuit breaker, the motor M1 is electrically connected with a first motor, and the motor M2 is electrically connected with a second motor.
Preferably, the upper end cover of the case body and the lower end cover of the case body are in threaded connection with the case shell through fastening bolts.
Preferably, a friction sensor is arranged on the outer side wall of the box body shell.
Preferably, the pressure sensor is mounted on an external body.
Preferably, the oil absorption filter is respectively connected with an oil tank, a liquid level meter and an air filter.
Preferably, one end of the external gear pump, which is far away from the fine filter, is connected with an oil absorption filter.
In the invention, the common friction and wear experiment platform is improved by mechanical, electric and hydraulic integrated technology, so that not only can the friction and wear performance test in different medium environments be realized, but also the friction and wear performance test under different rotating speeds and different loads can be realized.
Drawings
FIG. 1 is a schematic structural diagram of a high-speed high-pressure frictional wear experiment platform and an electrohydraulic control system thereof;
FIG. 2 is a main circuit diagram of an electric control system of an electrohydraulic control system of the high-speed high-pressure friction and wear experiment platform provided by the invention;
FIG. 3 is a PLC control circuit diagram of an electric control system of an electrohydraulic control system of the high-speed high-pressure friction and wear experiment platform;
fig. 4 is a working schematic diagram of a high-speed high-pressure frictional wear experiment platform and a hydraulic system of an electrohydraulic control system provided by the invention.
In the figure: 1 fastening round nut, 2 spindle, 3 sleeve, 4 belt hub, 5 hub bearing, 6 belt, 7 case upper end cap, 8 fastening bolt, 9 case housing, 10 spindle cooling unit, 11 cooling unit oil inlet, 12 upper friction clamping device, 13 upper friction (not upper friction clamp illustrated), 14 friction sensor, 15 base centering bearing, 16 coupling support, 17 loading piston, 18 case lower end cap, 19 hydraulic loading oil inlet, 20 base coupling shaft, 21 base support bearing, 22 temperature measuring device, 23 base, 24 top post, 25 pressure sensor, 26 medium outlet slot, 27 lower friction (illustrated, the lower friction piece clamp is not needed), 28 heating devices, 29 lubricating oil containers, 30 wrench ports, 31 cooling component oil outlets, 32 sealing rings, 33 large bearings, 34 fastening hexagonal nuts, 35 belt pulley rotating shafts, 36 first motors, 37 machine bodies, 38 oil tanks, 39 oil absorption filters, 40 liquid level meters, 41 air filters, 42 second motors, 43 tooth-shaped elastic couplings, 44 external gear pumps, 45 fine filters, 46 pressure gauges, 47 overflow valves, 48 sequence valves, 49 pressure relays, 50 three-position three-way electromagnetic reversing valves, 51 speed regulating valves I, 52 three-position four-way electromagnetic reversing valves, 53 speed regulating valves II, 54 pressure reducing valves and 55 hydraulic cylinders.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to figures 1-4, a high-speed high-pressure friction and wear experiment platform and an electrohydraulic control system thereof, the experiment platform comprises an experiment platform mechanism, a hydraulic system and an electric control system, wherein the experiment platform mechanism comprises a case shell 9, the upper end part of the case shell 9 is provided with a case body upper end cover 7, the outer side wall of the opening part of the case body upper end cover 7 is provided with two hub bearings 5, the outer side of each hub bearing 5 is sleeved with a belt hub 4, the outer side of each belt hub 4 is sleeved with a belt 6, one end of each belt 6 far away from each belt hub 4 is connected with a first motor 36, the first motor 36 is provided with a belt pulley rotating shaft 35 which is rotationally connected with the belt 6, the upper end of each belt hub 4 is provided with a sleeve 3, the upper side of the sleeve 3 is provided with a fastening round nut 1, the middle part of the fastening round nut 1 is inserted with a main shaft 2, the main shaft 2 penetrates through the sleeve 3 and the belt hub 4 and extends into the case shell 9, the connecting part of the upper end cover 7 of the box body and the machine case shell 9 is connected through a plurality of fastening hex nuts 34, a large bearing 33 connected with the main shaft 2 is arranged on the inner side wall of the opening part of the machine case shell 9, a main shaft cooling part 10 is arranged at the lower side of the large bearing 33, a sealing ring 32 is arranged between the main shaft cooling part 10 and the large bearing 33, a cooling part oil inlet 11 and a cooling part oil outlet 31 are respectively arranged on the side wall of the main shaft cooling part 10, a spanner opening 30 is arranged at the lower end of the main shaft 2, an upper friction part clamping device 12 is arranged at the lower side of the spanner opening 30, an upper friction part 13 is arranged at the lower side of the upper friction part clamping device 12, the upper friction part 13 and a lower friction part 27 are contacted under the action of a loading system to generate friction, a lower friction part (27) is arranged on a base 23, a lubricating oil container 29 is also arranged on the base 23, a heating device 28 is arranged at the outer side of the lubricating oil container 29, the bottom of the lubricating oil container 29 is provided with a medium outlet groove 26, the base is also provided with a jacking column 24, the jacking column 24 is contacted with a pressure sensor 25 arranged on the machine body in the friction test process, the lower side of the base 23 is provided with a plurality of base centering bearings 15, the lower side of the base 23 is also provided with a connecting support piece 16, a base supporting bearing 21 is arranged between the connecting support piece 16 and the base 23, the middle part of the connecting support piece 16 is provided with a base connecting shaft 20, the lower side of the connecting support piece 16 is provided with a loading piston 17, the base connecting shaft 20 is also connected with the loading piston 17, the lower surface of the machine case shell 9 is provided with a case lower end cover 18, the middle part of the case lower end cover 18 is provided with a hydraulic loading oil inlet 19, the case upper end cover 7 and the case lower end cover 18 are both connected with the machine case shell 9 through fastening bolts 8, the outer side wall of the case shell 9 is provided with a friction sensor 14, and the pressure sensor 25 is arranged on an external machine body 37;
the hydraulic system comprises a speed regulating valve II 53 connected with the main shaft cooling component 10, a pressure reducing valve 54 is connected to the other end of the speed regulating valve II 53, a fine filter 45, a pressure gauge 46, an overflow valve 47 and a sequence valve 48 are respectively connected to one end of the speed reducing valve 54 far away from the main shaft cooling component 10, a three-position three-way electromagnetic directional valve 50 and a three-position four-way electromagnetic directional valve 52 are respectively connected to one end of the sequence valve 48 far away from the sequence valve 48, a speed regulating valve I51 is connected to one end of the three-position three-way electromagnetic directional valve 50 far away from the sequence valve 48, a pressure relay 49 and a hydraulic cylinder 55 are connected to one end of the three-position four-way electromagnetic directional valve 52 far away from the sequence valve 48, an external gear pump 44 is arranged at one end of the fine filter 45 far away from the pressure reducing valve 54, a second motor 42 is connected to the external gear pump 44 through a tooth-shaped elastic coupling 43, an oil absorbing filter 39 is respectively connected to an oil tank 38, a liquid level gauge 40 and an air filter 41, and an oil absorbing filter 39 are connected to one end of the external gear pump 44 far away from the fine filter 45;
the electric control system comprises a main circuit and a PLC control circuit, wherein the main circuit comprises a motor M1, a motor M2, a three-phase frequency converter output filter, a three-phase power supply EMI filter, a frequency converter, a zero-phase reactor and a circuit breaker, the motor M1 is electrically connected with the first motor 36, and the motor M2 is electrically connected with the second motor 42.
In the invention, after the first motor 36 is powered on, the belt pulley rotating shaft 35 is driven to rotate, meanwhile, the belt 6 and the main shaft 2 are driven to rotate, and the main shaft 2 and the belt hub 4 are fixed through a pair of round nuts 1 and sleeves 3 with opposite directions; the upper end cover 7 and the lower end cover 18 of the box body are fixed with the chassis shell 9 through fastening bolts 8. Because the friction heat generated by the main shaft 2 in the high-speed operation process is large, the main shaft cooling component 10 is specially adopted, and the oil liquid output by the hydraulic system enters the cavity of the main shaft cooling component 10, so that a section with high heating value of the immersed main shaft 2 is surrounded, and the heat generated by the main shaft is taken away through the rapid circulation of the oil liquid, so that the cooling effect is achieved. The cooling member oil inlet 11 and the cooling member oil outlet 31 are the cooling member oil inlet and outlet, respectively. The upper friction member clamping device 12 is inserted into the lower end of the main shaft 2, is matched with a slot at the lower end of the main shaft 2 through an oval boss at the top of the upper friction member clamping device, and can be separated from the main shaft 2 together with the upper friction member 13 through a wrench opening 30. The main shaft 2 is driven by the belt 6 to rotate at a high speed under the support of the hub bearing 5 and the large bearing 33, and drives the upper friction member clamping device 12 and the upper friction member 13 to rotate at a high speed, so that friction is generated with the lower friction member 27. The upper friction member 13 is mounted on the clamping device 12 by a pin and the lower friction member 27 is mounted on the base 23 by a pin. Reference numeral 14 denotes a friction sensor for measuring the friction force between friction members in real time; 22 is a temperature measuring device for measuring the temperature of the friction process in real time; and 25 is a pressure sensor fixed on the machine body and used for measuring the torque of the rotating shaft, and the pressure sensor needs to be matched with the jacking column 24 during measurement. The lubricant container 29 can be used for containing different lubricant, and is arranged on the upper part of the base 23 through external threads so as to realize friction between the upper friction piece and the lower friction piece in different friction medium environments. 28 is a heating device for heating the medium to realize the friction experiment test between the upper and lower friction members in the friction medium environment with different temperatures, the medium outlet groove 26 is used for discharging the friction medium, and the hydraulic system is divided into two branches: one is a cooling branch, which is composed of a pressure reducing valve 17, a speed regulating valve 16 and a main shaft cooling part 10; one is a load branch that flows through the sequence valve 48, and is constituted by the sequence valve 48, the three-position three-way electromagnetic directional valve 50, the speed regulating valve one 51, the three-position four-way electromagnetic directional valve 52, the pressure relay 49, and the hydraulic cylinder 55. In order to prevent the interaction of the two branches, in particular the cooling branch when the loading branch is in the unloaded state, a sequence valve 48 is provided in particular before the oil enters the loading branch. The whole hydraulic system is supplied with oil by a gear pump driven by a motor, and an overflow valve 47 with a safety protection function is arranged at the outlet of the gear pump; in order to ensure the cleanness of oil, an oil suction filter 39 and a fine filter 45 are respectively arranged at the oil inlet and outlet of the gear pump; in order to monitor the outlet pressure of the gear pump, a pressure gauge 46 is provided; the oil tank is also provided with a liquid level meter 40 and an air filter 41, the liquid level meter is used for monitoring the liquid level of oil in the oil tank, the air filter is used for preventing sundries in air from entering the oil in the oil tank, because the oil pressure required by a cooling branch is not high, the oil pressure entering the branch is firstly required to be reduced, and a reducing valve 54 is specially arranged, when the oil pressure passes through the reducing valve 54 and is reduced, before entering the middle main shaft cooling component 10, the flow rate is required to be regulated through a speed regulating valve 53, so that the purpose of controlling the cooling speed is achieved, when the three-position three-way electromagnetic directional valve 50 is in the middle position, hydraulic oil passing through the sequence valve 48 directly enters the oil tank through the middle position of the three-position three-way electromagnetic directional valve 50, namely, is in the unloading state of the middle position energy, and at the moment, the hydraulic cylinder 55 is in the non-working state; when the electromagnet at the left side of the three-position three-way electromagnetic directional valve 50 is powered on and is in the left working state, if the electromagnet at the left side of the three-position four-way electromagnetic directional valve 52 is powered on and is in the left working state, the piston of the hydraulic cylinder 55 moves upwards to implement the loading function, and the loading speed can be controlled by adjusting the opening size of the speed regulating valve (when the opening size of the speed regulating valve is enlarged, the flow entering the three-position four-way electromagnetic directional valve 52 and the hydraulic cylinder 55 is reduced due to the increase of the flow passing through the three-position three-way electromagnetic directional valve 50 and the speed regulating valve, otherwise, the loading speed is increased); when the three-position three-way electromagnetic directional valve 50 works in the left position, if the three-position four-way electromagnetic directional valve 52 works in the right position, the piston of the hydraulic cylinder 55 descends, namely, the upper friction piece 13 and the lower friction piece 27 shown in fig. 1 are separated, no friction and wear experiment is performed, and the descending speed of the piston of the hydraulic cylinder 55 can be regulated through the speed regulating valve immediately; when the three-position three-way electromagnetic directional valve 50 works in the right position, oil enters the three-position three-way electromagnetic directional valve 50 to be cut off, at this time, the three-position four-way electromagnetic directional valve 52 is controlled to be in a neutral position state by a control system (at this time, the three-position four-way electromagnetic directional valve 52 can work in the left position or the right position, and the ascending and descending of the piston of the hydraulic cylinder 55 can also be realized, but the ascending and descending of the piston are not regulated and controlled by the regulating valve, so that the working state is not recommended), under the action of the neutral position function of the three-position four-way electromagnetic directional valve 52, the oil inlet and outlet paths of the hydraulic cylinder 55 are cut off, and the hydraulic cylinder is in a pressure maintaining state, at this time, the loading force is maintained at a fixed value, namely the friction and abrasion under a certain loading force is realized, and the loading oil pressure at this time is monitored by the pressure relay. Because the pressure maintaining characteristic of the median function of the three-position four-way electromagnetic directional valve 52 is determined by the structural performance of the three-position four-way electromagnetic directional valve 52, after a period of time, the pressure of the hydraulic cylinder 55 is gradually reduced due to structural leakage, when the pressure is reduced to the pressure value set by the pressure relay 49, the pressure relay 49 sends out an electric signal to control the power supply of the three-position four-way electromagnetic directional valve 52 and the three-position three-way electromagnetic directional valve 50 (if the pressure needs to be increased to continue to perform experiments, the three-position three-way electromagnetic directional valve 50 and the three-position four-way electromagnetic directional valve 52 are all powered on in the left position, and if the experiments need to be stopped, the three-position three-way electromagnetic directional valve 50 is powered on in the left position, and the three-position four-way electromagnetic directional valve 52 is powered on in the right position), and the speed regulating circuit of the frequency converter mainly comprises a main circuit of the frequency converter, a frequency-conversion speed regulating motor M, a circuit breaker QF, a contactor KM and the like. The motor M1 drives the belt pulley to rotate, and drives the main shaft through belt transmission; the motor M2 drives the motor of the hydraulic pump, controls the opening and closing of the hydraulic loop, and the PLC and the frequency converter are connected by adopting control terminals. The input terminal of PLC connects control button, alarm and power, and output terminal connects intermediate relay coil, pilot lamp and power. The intermediate relay coils KA2 and KA3 are respectively connected with the coils of the main circuit contactor through normally open contacts of the intermediate relay coils, so that the on-off of a main power supply of the frequency converter and the start and stop of the main shaft motor and the hydraulic pump motor are controlled. The analog input signal of the frequency converter is connected with the analog output module of the PLC through twisted pair shielded cables. After the circuit breaker QF is connected, the upper indicator lamp is on, both KM1 and KM2 are powered on, the KM2 is electrically shocked and closed, when the rotating shaft motor starting button SB1 is connected, KA2 is powered on, meanwhile KA2 is electrically shocked and closed, the frequency converter is started, meanwhile KM1 is electrically shocked and closed, the motor M1 is powered on, and the main shaft motor starting indicator lamp is on. After the lock knob SB4 is turned on, KA3 gets electricity, and KA3 gets electricity to be closed, the hydraulic pump motor M2 gets electricity, and the hydraulic pump starts. When the three-position three-way electromagnetic valve reversing valve works in the left position, SB5 is connected, KA4 is electrified, and the three-position three-way electromagnetic valve reversing valve left position working indicator lamp is on; when the left position of the three-position three-way electromagnetic valve reversing valve stops working, SB6 is connected, KA4 is disconnected, and the left position working indicator lamp of the three-position three-way electromagnetic valve reversing valve is turned off; when the three-position three-way electromagnetic valve reversing valve works in the right position, SB7 is connected, KA5 is powered on, and the three-position three-way electromagnetic valve reversing valve right-position working indicator lamp is on; when the right position of the three-position three-way electromagnetic valve reversing valve stops working, SB8 is connected, KA5 is disconnected, and the left position working indicator lamp of the three-position three-way electromagnetic valve reversing valve is turned off; when one of SB6 and SB8 is electrically connected, the three-position three-way electromagnetic valve reversing valve is in a neutral state. When the three-position four-way solenoid valve reversing valve works in the left position, SB9 is connected, KA6 is electrified, and the three-position four-way solenoid valve reversing valve left position working indicator lamp is on; when the left position of the reversing valve of the three-position four-way electromagnetic valve stops working, SB10 is switched on, KA6 is switched off, and the left position working indicator lamp of the reversing valve of the three-position four-way electromagnetic valve is turned off; when the reversing valve of the three-position four-way electromagnetic valve works in the right position, SB11 is connected, KA7 is electrified, and the reversing valve of the three-position four-way electromagnetic valve works in the right position to indicate that the lamp is on; when the right position of the reversing valve of the three-position four-way electromagnetic valve stops working, SB12 is connected, KA7 is disconnected, and the left position working indicator lamp of the reversing valve of the three-position four-way electromagnetic valve is turned off; when one of SB10 and SB12 is electrically connected, the reversing valve of the three-position four-way electromagnetic valve is in a neutral state.
The auxiliary input terminals R0 and T0 of the control power supply are connected to the output side of the circuit breaker so as to prevent the control circuit of the frequency converter from losing power due to the disconnection of the frequency converter switch when the frequency converter protection function acts. The PLC input terminal controls whether each electromagnetic reversing valve is electrified or not, controls the corresponding position indicator lamp to be on, and changes the working position of the reversing valve. The analog input module performs A/D conversion on each sensor signal and the motor output rotating speed feedback signal on the operation site and sends the signals to the upper computer, so that closed-loop control of the rotating shaft motor operation speed and real-time monitoring of the operation environment are realized. The filter capacitor is connected to the input side of the frequency converter to reduce noise in the AM radio frequency band (below 1 MHz).
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (6)
1. The utility model provides a high-speed high-pressure friction wear experiment platform and electrohydraulic control system thereof, includes experiment platform mechanism, hydraulic system and electrical system, experiment platform mechanism includes chassis housing (9), its characterized in that, the upper end of chassis housing (9) is equipped with box upper end cover (7), two hub bearings (5) have been installed on the lateral wall of the opening part of box upper end cover (7), the outside cover of hub bearings (5) is equipped with belt hub (4), the outside cover of belt hub (4) is equipped with belt (6), the one end that belt hub (6) kept away from is connected with first motor (36), be equipped with on first motor (36) with belt pulley axis of rotation (35) of belt (6) swivelling joint, the upper end of belt hub (4) is equipped with sleeve (3), the upside of sleeve (3) is equipped with fastening round nut (1), the middle part of having fastening round nut (1) is inserted and is equipped with main shaft (2), main shaft (2) run through sleeve (3), belt hub (4) and extend to inside chassis housing (9), the belt hub (6) is kept away from the one end of belt hub (4) is connected with the belt pulley axis (35) of rotation (35) with the inside chassis housing (9), the upper end cover (9) is connected through the fastening nut (34), the utility model discloses a test device for a high-pressure fluid, which comprises a machine case shell (9), wherein a large bearing (33) connected with a main shaft (2) is arranged on the inner side wall of the opening of the machine case shell (9), a main shaft cooling part (10) is arranged on the lower side of the large bearing (33), a sealing ring (32) is arranged between the main shaft cooling part (10) and the large bearing (33), a cooling part oil inlet (11) and a cooling part oil outlet (31) are respectively arranged on the side wall of the main shaft cooling part (10), a spanner opening (30) is arranged at the lower end of the main shaft (2), an upper friction part clamping device (12) is arranged on the lower side of the spanner opening (30), an upper friction part (13) is arranged on the lower side of the upper friction part clamping device (12), the upper friction part (13) and a lower friction part (27) are contacted under the action of a loading system so as to generate friction, the lower friction part (27) is arranged on a base (23), a lubricating oil container (29) is also arranged on the base (23), a heating device (28) is arranged on the outer side of the lubricating oil container (29), an outlet groove (26) is arranged at the bottom of the main shaft (2), a medium outlet groove (26), a plurality of pressure sensors (24) are arranged on the base (24) and are arranged on the base (25), and the base (25), the lower side of the base (23) is also provided with a connecting support piece (16), a base support bearing (21) is arranged between the connecting support piece (16) and the base (23), the middle part of the connecting support piece (16) is provided with a base connecting shaft (20), the lower side of the connecting support piece (16) is provided with a loading piston (17), the base connecting shaft (20) is also connected with the loading piston (17), the lower surface of the chassis shell (9) is provided with a box body lower end cover (18), and the middle part of the box body lower end cover (18) is provided with a hydraulic loading oil inlet (19);
the hydraulic system comprises a speed regulating valve II (53) connected with a main shaft cooling component (10), the other end of the speed regulating valve II (53) is connected with a pressure reducing valve (54), one end of the pressure reducing valve (54) away from the main shaft cooling component (10) is respectively connected with a fine filter (45), a pressure gauge (46), an overflow valve (47) and a sequence valve (48), one end of the sequence valve (48) away from the pressure reducing valve (54) is respectively connected with a three-position three-way electromagnetic reversing valve (50) and a three-position four-way electromagnetic reversing valve (52), one end of the three-position three-way electromagnetic reversing valve (50) away from the sequence valve (48) is connected with a speed regulating valve I (51), one end of the three-position four-way electromagnetic reversing valve (52) away from the sequence valve (48) is connected with a pressure relay (49) and a hydraulic cylinder (55), one end of the fine filter (45) away from the pressure reducing valve (54) is provided with an external engagement gear pump (44), and the external engagement gear pump (44) is connected with a second motor (42) through a gear pump elastic coupling (43);
the electric control system comprises a main circuit and a PLC control circuit, wherein the main circuit comprises a motor M1, a motor M2, a three-phase frequency converter output filter, a three-phase power supply EMI filter, a frequency converter, a zero-phase reactor and a circuit breaker, the motor M1 is electrically connected with a first motor (36), and the motor M2 is electrically connected with a second motor (42).
2. The high-speed high-pressure friction and wear experiment platform and the electrohydraulic control system thereof according to claim 1, wherein the upper end cover (7) and the lower end cover (18) of the box body are in threaded connection with the chassis shell (9) through fastening bolts (8).
3. The high-speed high-pressure friction and wear experiment platform and the electrohydraulic control system thereof according to claim 2, wherein a friction sensor (14) is arranged on the outer side wall of the chassis shell (9).
4. The high-speed high-pressure frictional wear test platform and its electrohydraulic control system according to claim 1, wherein said pressure sensor (25) is mounted on an external fuselage (37).
5. The high-speed high-pressure friction and wear experimental platform and the electrohydraulic control system thereof according to claim 1, wherein one end of the external gear pump (44) far away from the fine filter (45) is connected with an oil absorption filter (39).
6. The high-speed high-pressure friction and wear experiment platform and the electrohydraulic control system thereof according to claim 5, wherein the oil suction filter (39) is respectively connected with an oil tank (38), a liquid level meter (40) and an air filter (41).
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| CN102269678A (en) * | 2011-05-13 | 2011-12-07 | 重庆市蓝黛实业有限公司 | Testing device for temperature measurement of wet multi-plate clutch friction steel disc |
| CN105043913A (en) * | 2015-08-11 | 2015-11-11 | 浙江大学 | Oil lubrication friction-wear test system with controllable temperature |
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| JP3379727B2 (en) * | 1994-07-15 | 2003-02-24 | 株式会社リケン | Friction and wear test equipment |
| RU32602U1 (en) * | 2003-05-21 | 2003-09-20 | Томский государственный архитектурно-строительный университет | Automated complex for tribotechnical control of the lubricating properties of working fluids and the study of the friction-wear properties of structural materials |
| CN102384879A (en) * | 2010-08-30 | 2012-03-21 | 江苏明珠试验机械有限公司 | Rolling bearing slide rail friction and abrasion test machine |
| CN102175544B (en) * | 2010-12-25 | 2012-09-05 | 中北大学 | Frictional wear simulation test bench of wobble friction pair |
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| CN208270358U (en) * | 2017-09-04 | 2018-12-21 | 贵州大学 | A kind of high speed and high pressure frictional wear experiment platform |
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| CN102269678A (en) * | 2011-05-13 | 2011-12-07 | 重庆市蓝黛实业有限公司 | Testing device for temperature measurement of wet multi-plate clutch friction steel disc |
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