CN111638021A - Electric pneumatic valve detection test bed - Google Patents
Electric pneumatic valve detection test bed Download PDFInfo
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- CN111638021A CN111638021A CN202010654580.1A CN202010654580A CN111638021A CN 111638021 A CN111638021 A CN 111638021A CN 202010654580 A CN202010654580 A CN 202010654580A CN 111638021 A CN111638021 A CN 111638021A
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- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 238000012360 testing method Methods 0.000 title claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 27
- 230000004044 response Effects 0.000 claims abstract description 13
- 230000004907 flux Effects 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 3
- 238000013480 data collection Methods 0.000 claims 2
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000009661 fatigue test Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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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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- 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
- G01R31/003—Environmental or reliability tests
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Abstract
The invention relates to an electro-pneumatic valve detection test bed which comprises a cabinet body, wherein the cabinet body comprises an upper part and a lower part, an air pipeline is arranged at the lower part and used for providing a detection air source, a control unit is arranged at the upper part, an acquisition unit is arranged between the control unit and the air pipeline and used for acquiring parameter signals of air tightness, flux, response time, starting release voltage and back electromotive force of an electro-pneumatic valve, and the control unit is used for detecting the parameter signals. The air valve detection device is provided with an air pipeline for providing an air source, an acquisition unit for acquiring air pressure and voltage, a control unit for judging the air tightness, the flux, the response time, the starting and releasing voltage and the reverse electromotive force of the detected electro-pneumatic valve according to the detection parameters of the acquisition unit, and a conversion module for fixing the detected electro-pneumatic valve, wherein the detection parameters are changed by setting up the air pipeline to realize the detection of the electro-pneumatic valves of different models.
Description
Technical Field
The invention relates to the technical field of detection of an electro-pneumatic valve of a locomotive braking system, in particular to a test bed for detecting the electro-pneumatic valve.
Background
The brake system is a key part influencing the running safety of a locomotive, and performance test and fault check analysis of the electro-pneumatic valve are required to be carried out to ensure the safety and reliability of various valves of the brake system. The existing electric air valve test bed has single function, generally can only complete the air tightness test of an electric control valve with an appointed model, cannot adapt to electric air valves with various models, and cannot perform comprehensive test detection and analysis on the basic performance of the electric air valve.
For example, patent document CN201320205373.3 entitled "a universal three-way solenoid valve air tightness detection device" discloses an electromagnetic valve air tightness detection device, but the device can only determine the air tightness index of the three-way solenoid valve, cannot be used for solenoid valves of other types, and can only detect the air tightness when in use, and this device cannot record the detection result, and is not convenient for sample analysis in the later period.
Disclosure of Invention
The invention provides an electro-pneumatic valve detection test bed for solving the problem of inconvenient detection of a non-standard electric control valve, which is provided with an air pipeline for providing an air source, an acquisition unit for acquiring air pressure and voltage, a control unit for judging the air tightness, the flux, the response time, the starting release voltage and the reverse electromotive force of a detected electro-pneumatic valve according to the detection parameters of the acquisition unit, and a conversion module for fixing the detected electro-pneumatic valve.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an electro-pneumatic valve detection test bed comprises a cabinet body, wherein the cabinet body comprises an upper portion and a lower portion, the lower portion is of a square structure with a hollow interior, the upper portion is of a trapezoidal structure with a hollow interior and an open bottom, the upper portion and the lower portion are of an integrated structure, an air pipeline is arranged at the lower portion and used for providing a detection air source, a control unit is arranged at the upper portion, an acquisition unit is arranged between the control unit and the air pipeline and used for acquiring parameter signals of air tightness, flux, response time, starting release voltage and back electromotive force of an electro-pneumatic valve, and the control unit is used for detecting the parameter signals;
the up end on upper portion is provided with fixed establishment, fixed establishment includes gas circuit base plate and a plurality of conversion module, the gas circuit base plate is rectangular shape board, and the gas circuit base plate passes through the bolt fastening with the conversion module, correspond the conversion module on the gas circuit base plate and seted up a plurality of gas ports, the gas port is the circular port, and the gas port is three to be a set of, the gas port corresponds the empty valve air inlet interval and sets up.
The air path comprises a first two-position two-way valve, a second two-position two-way valve, a third two-position two-way valve, a fourth two-position two-way valve, a fifth two-position two-way valve and two secondary cylinders, the main cylinder is communicated with the air path through the air filter, the regulating valve, the flow meter and the proportional regulating valve, and an air outlet of the proportional regulating valve is connected with the first two-position two-way valve and the second two-position two-way valve;
the air outlet of the first two-position two-way valve is connected with a secondary cylinder, and the air outlet of the secondary cylinder is connected with an air port;
the air outlet of the second two-position two-way valve is respectively connected with a third two-position two-way valve and a fourth two-position two-way valve;
the air outlet connecting port of the third two-position two-way valve is connected with another secondary cylinder through the tested electro-pneumatic valve, and the air outlet of the other secondary cylinder is connected with a fifth two-position two-way valve;
and air outlets of the fourth two-position two-way valve and the fifth two-position two-way valve are both connected with silencers.
Furthermore, the acquisition unit comprises a data acquisition card, a plurality of pressure sensors and a high-frequency pressure sensor, and the output ends of the pressure sensors and the high-frequency pressure sensor are connected with the input end of the data acquisition card;
the pressure sensors are respectively arranged at the positions of the main cylinder and the two secondary cylinders, and the high-frequency pressure sensor is arranged at the position of an air outlet of the tested electro-pneumatic valve.
Further, the control unit comprises an industrial personal computer and a display, the industrial personal computer is connected with a lower computer through an RS232 communication module, an IO port of the lower computer is connected with a plurality of relays, and a plurality of coils of the relays are connected with the IO port of the lower computer, and normally open contacts are respectively connected with a regulating valve, a proportional regulating valve, a first two-position two-way valve, a second two-position two-way valve, a third two-position two-way valve, a fourth two-position two-way valve, a fifth two-position two-way valve, a pressure sensor and a high-frequency pressure sensor.
Further, the conversion module is a convex plate body, a round through hole is formed in the side face of the conversion module, a bolt is arranged in the through hole, the conversion module and the tested electro-pneumatic valve are fixed through the bolt, the display is embedded in the upper portion of the cabinet body, and a cabinet door is hinged to the lower portion of the cabinet body.
The invention has the beneficial effects that:
1. the air valve is provided with an air pipeline, the air pipeline is used for providing a detection air source, a control unit is arranged at the upper part of the air pipeline, an acquisition unit is arranged between the control unit and the air pipeline, the acquisition unit is used for acquiring parameter signals of air tightness, flux, response time, starting release voltage and reverse electromotive force of the electro-pneumatic valve, and the control unit is used for detecting the parameter signals;
during operation, the air pipeline is connected with three valve ports of the tested electro-pneumatic valve, the control unit is used for controlling each electric element in the air pipeline, so that the air pipeline is operated respectively, a detection passage for detecting air tightness, flux, response time, starting release voltage, back electromotive force and fatigue performance is constructed, through single detection, the acquisition unit outputs experimental parameters of a detection point to the control unit, and the control unit judges the detection parameters, so that whether the tested electro-pneumatic valve is qualified is judged.
2. The air circuit substrate is a strip-shaped plate, the air circuit substrate and the conversion modules are fixed through bolts, a plurality of air ports are formed in the air circuit substrate and correspond to the conversion modules, the air ports are circular holes, the air ports are in a group, and the air ports are formed in the interval corresponding to air inlets of the electro-pneumatic valve.
Before detecting, it is fixed with conversion module to be surveyed electro-pneumatic valve, and conversion module is fixed with the gas circuit base plate, and a plurality of conversion modules can set up a plurality of electro-pneumatic valves of being surveyed respectively, combine together with air pipeline, acquisition unit and the control unit and realize that a plurality of electro-pneumatic valves of being surveyed carry out detection of different categories simultaneously to detection efficiency has been improved.
Drawings
Fig. 1 is one of the structural schematic diagrams of an electric pneumatic valve detection test bed of the present invention.
Fig. 2 is a second schematic structural diagram of an electro-pneumatic valve detection test bed according to the present invention.
Fig. 3 is a gas path schematic diagram of an electro-pneumatic valve detection test bed of the invention.
Fig. 4 is a system schematic diagram of an electro-pneumatic valve detection test bed of the invention.
The reference numbers in the drawings are as follows: the air conditioner comprises a cabinet body 1, an air path substrate 2, a conversion module 3, an air port 4, an air filter 5, a regulating valve 6, a proportional regulating valve 7, a first two-position two-way valve 8, a second two-position two-way valve 9, a third two-position two-way valve 10, a fourth two-position two-way valve 11, a fifth two-position two-way valve 12, a secondary cylinder 13, a pressure sensor 15, a high-frequency pressure sensor 16, an industrial personal computer 17, a display 18, a lower computer 19, a relay 20, a cabinet door 21 and a main cylinder 22.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings in which:
as shown in fig. 1 to 4, an electro-pneumatic valve detection test bed comprises a cabinet body 1, wherein the cabinet body 1 comprises an upper portion and a lower portion, the lower portion is of a square structure with a hollow interior, the upper portion is of a trapezoid structure with a hollow interior and an open bottom, the upper portion and the lower portion are of an integrated structure, the lower portion is provided with an air pipeline, the air pipeline is used for providing a detection air source, the upper portion is provided with a control unit, an acquisition unit is arranged between the control unit and the air pipeline, the acquisition unit is used for acquiring parameter signals of air tightness, flux, response time, starting release voltage and reverse electromotive force of an electro-pneumatic valve, and the control unit is used for detecting the parameter signals;
the up end on upper portion is provided with fixed establishment, fixed establishment includes gas circuit base plate 2 and a plurality of conversion module 3, gas circuit base plate 2 is rectangular shape board, and gas circuit base plate 2 passes through the bolt fastening with conversion module 3, correspond conversion module 3 on the gas circuit base plate 2 and seted up a plurality of gas ports 4, gas port 4 is the circular port, and gas port 4 is three to be a set of, gas port 4 corresponds the electro-pneumatic valve air inlet interval and sets up.
In order to optimize the product structure, the air pipeline comprises a main air cylinder 22, an air filter 5, a regulating valve 6, a flow meter, a plurality of proportion regulating valves 7 and a plurality of air pipelines, the air pipelines comprise a first two-position two-way valve 8, a second two-position two-way valve 9, a third two-position two-way valve 10, a fourth two-position two-way valve 11, a fifth two-position two-way valve 12 and two secondary air cylinders 13, the main air cylinder 22 is communicated with the air pipelines through the air filter 5, the regulating valve 6, the flow meter and the proportion regulating valves 7, and the air outlets of the proportion regulating valves 7 are connected with the first two-position two-way valve 8 and;
the air outlet of the first two-position two-way valve 8 is connected with a secondary cylinder 13, and the air outlet of the secondary cylinder 13 is connected with an air port 4;
the air outlet of the second two-position two-way valve 9 is respectively connected with a third two-position two-way valve 10 and a fourth two-position two-way valve 11;
the air outlet connecting air port 4 of the third two-position two-way valve 10 is connected with another secondary cylinder 13 through a tested electro-pneumatic valve, and the air outlet of the other secondary cylinder 13 is connected with a fifth two-position two-way valve 12;
and the air outlets of the fourth two-position two-way valve 11 and the fifth two-position two-way valve 12 are both connected with silencers.
For convenience of data acquisition, the acquisition unit comprises a data acquisition card, a plurality of pressure sensors 15 and a high-frequency pressure sensor 16, and the output ends of the pressure sensors 15 and the high-frequency pressure sensor 16 are connected with the input end of the data acquisition card;
the pressure sensors 15 are respectively arranged at the positions of the main cylinder 22 and the two secondary cylinders 13, and the high-frequency pressure sensor 16 is arranged at the position of the air outlet of the tested electro-pneumatic valve.
In this embodiment, the data acquisition card is a PCI-1712 type data acquisition card, the sampling frequency of the data acquisition card is 100KHz, and the high-frequency pressure sensor 16 employs a high-frequency dynamic pressure transmitter, and the response precision of the high-frequency dynamic pressure transmitter is 1/1000, so as to achieve high-speed and accurate data acquisition.
In order to detect different items of various electric control valves at the same time, the control unit comprises an industrial personal computer 17 and a display 18, the industrial personal computer 17 is connected with a lower computer 19 through an RS232 communication module, an IO port of the lower computer 19 is connected with a plurality of relays 20, a plurality of coils of the relays 20 are connected with the IO port of the lower computer 19, and normally open contacts are respectively connected with the regulating valve 6, the proportional regulating valve 7, the first two-position two-way valve 8, the second two-position two-way valve 9, the third two-position two-way valve 10, the fourth two-position two-way valve 11, the fifth two-position two-way valve 12, the pressure sensor 15 and the high-frequency pressure sensor.
In order to fix the tested electro-pneumatic valve, the conversion module 3 is a convex plate body, a round through hole is formed in the side face of the conversion module 3, a bolt is arranged in the through hole, the conversion module 3 and the tested electro-pneumatic valve are fixed through the bolt, the display 18 is embedded in the upper portion of the cabinet body 1, and the lower portion of the cabinet body 1 is hinged with a cabinet door 21.
In this embodiment, the number of the conversion modules 3 provided with 4 stations and the number of the air paths are 4, as shown in fig. 3, the 3 rd path is taken as an example for explanation;
1. when the airtightness detection is performed:
1.1, carrying out an air tightness test from an air inlet to a working port or an air outlet (when the electro-pneumatic valve is in a power-off state);
the lower computer 19 is controlled by the industrial personal computer 17 to open the regulating valve 6 through the relay 20, the main air cylinder 22 supplies air, then the first two-position two-way valve 8 (with the reference number YV9 in the figure) is opened according to the process, the secondary air cylinder 13 (with the reference number Res3 in the figure) is inflated, the pressure sensor 15 (with the reference number CA7 in the figure) detects the pressure in the secondary air cylinder 13 and transmits the pressure to the industrial personal computer 17 through the data acquisition card, the inflation is completed when the pressure in the secondary air cylinder 13 reaches the set air pressure of the industrial personal computer 17, and then the YV9 is closed to. After the pressure is stabilized for a certain time, the industrial personal computer 17 starts timing, and the pressure drop value of the CA7 in the timing period is the leakage index when the tested electro-pneumatic valve is turned off.
1.2 air tightness test from the air inlet or the working port to the air outlet (the electric air valve is in an electric state);
the tested electric air valve is electrified through the industrial personal computer 17, and according to the steps, the YV9 is opened, the second two-position two-way valve 9 (numbered as YV10 in the figure), the third two-position two-way valve 10 (numbered as YV11 in the figure) and the fourth two-position two-way valve 11 (numbered as YV12 in the figure) are closed, and Res3 is inflated to the set air pressure. The gas source is blocked by closing YV9 through the industrial personal computer 17. After the pressure is stabilized for a certain time, the industrial personal computer 17 starts to time and simultaneously acquires the pressure value of CA7, and the pressure drop of CA7 in the timing stage is the leakage index when the tested electro-pneumatic valve is turned off.
1.3 air-tight test of air outlet;
when the tested electromagnetic valve loses power, the YV10 and the YV11 are opened, the YV9, the YV12 and the fifth two-position two-way valve 12 (marked as YV13 in the figure) are closed, and the secondary air cylinder 13 (marked as Res6 in the figure) is inflated to a set air pressure. And closing YV10 and YV11 to block the air source and electrify the tested electric air valve. After the pressure is stabilized for a certain time, timing is started, and meanwhile, the pressure value of the pressure sensor 15 (labeled as CA8 in the figure) is collected, and the pressure drop of CA8 in the timing stage is the leakage index when the tested electro-pneumatic valve is turned off.
2. And (3) flux testing:
A30-3000L/min flow meter (with the precision of 3% FS) is arranged on a main circuit, so that the tested electric air valve is completely opened after electricity is obtained, the numerical value of the air flow passing through the flow meter is stable, namely the current flow of the tested electromagnetic valve, the detection parameters of the flow meter are collected through a data acquisition card, and the CV value of the tested electric air valve is calculated and output through the software of an industrial personal computer 17.
3. Starting and releasing voltage test:
the tested electric air valve is in a power supply state, the lower computer 19 is controlled by the industrial personal computer 17, the amplitude of a power supply is adjusted from low to high, the data acquisition card acquires the pressure value of the high-frequency pressure sensor 16 (the reference number is CA 3) at the outlet of the tested electric air valve, when the detected value is output, the tested electric air valve is proved to be opened at the moment, and the recorded voltage value is the starting voltage. On the contrary, the voltage is adjusted from high to low according to the steps, and the release voltage of the electro-pneumatic valve can be detected.
4. Response time test:
the tested electric air valve is powered through the industrial personal computer 17, and the time point t is recorded0Detecting the pressure of the outlet CA3 of the tested electro-pneumatic valve, and recording the time point t when the pressure value reaches 90 percent of the average stable air pressure1Opening response time T of tested electro-pneumatic valve1=t1- t0；
Otherwise, the tested electric air valve is powered off through the industrial personal computer 17, and the time point t is recorded at the same time2Detecting the pressure of the outlet CA3 of the tested electro-pneumatic valve, and recording the time point t when the pressure value is reduced to 10 percent of the average stable air pressure3Response time T of the shut-off of the tested electro-pneumatic valve2= t3-t2。
5. And (3) detecting the back electromotive force:
the method comprises the steps of adopting a digital oscilloscope to capture waveforms of a tested electric air valve during power-on and power-off, connecting a digital oscilloscope and an industrial personal computer 17 through an RS232 serial port, transmitting the captured waveforms to the industrial personal computer 17, processing the captured waveforms through software, outputting and displaying the processed waveforms, and comparing prestored waveforms with captured waveforms to judge whether abnormity exists.
6. And (3) fatigue test:
the tested electro-pneumatic valve is in a rated voltage and rated air pressure state through the industrial personal computer 17. The industrial personal computer 17 is used for controlling the lower computer 19 to enable the relay 20 to control the tested electro-pneumatic valve to be repeatedly switched on and off, the action frequency can be set through the industrial personal computer 17, the action frequency is set according to the response time characteristic of the tested electro-pneumatic valve, and the maximum frequency is 10 Hz. Meanwhile, the industrial personal computer 17 records the on-off action times of the tested electro-pneumatic valve and the time interval between two adjacent actions, and automatically detects whether the electro-pneumatic valve is stuck or not and whether the response time is out of tolerance or not.
During the automatic detection of the electro-pneumatic valve, the six detection items are alternately combined to simulate the actual operation condition, for example, the air tightness test, the starting voltage test and the releasing voltage test are carried out after N fatigue tests are set, and the fatigue test is continued after the detection is qualified, so that a better detection effect is achieved, and the follow-up analysis and improvement are facilitated.
The above-described embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications in the structure, features and principles described in the present invention should be included in the claims of the present invention.
Claims (5)
1. The electro-pneumatic valve detection test bed comprises a cabinet body (1), and is characterized in that the cabinet body (1) comprises an upper portion and a lower portion, the lower portion is of a square structure with a hollow interior, the upper portion is of a trapezoid structure with a hollow interior and an open bottom, the upper portion and the lower portion are of an integrated structure, the lower portion is provided with an air pipeline, the air pipeline is used for providing a detection air source, the upper portion is provided with a control unit, an acquisition unit is arranged between the control unit and the air pipeline, the acquisition unit is used for acquiring parameter signals of air tightness, flux, response time, starting release voltage and reverse electromotive force of an electro-pneumatic valve, and the control unit is used for detecting the parameter signals;
the up end on upper portion is provided with fixed establishment, fixed establishment includes gas circuit base plate (2) and a plurality of conversion module (3), gas circuit base plate (2) are rectangular shape board, and gas circuit base plate (2) pass through the bolt fastening with conversion module (3), correspond conversion module (3) on gas circuit base plate (2) and seted up a plurality of gas ports (4), gas port (4) are the circular port, and gas port (4) are three to be a set of, gas port (4) correspond the electro-pneumatic valve air inlet interval and set up.
2. The electro-pneumatic valve detection test bed as claimed in claim 1, wherein the air line comprises a main cylinder (22), an air filter (5), a regulating valve (6), a flow meter, a plurality of proportional regulating valves (7) and a plurality of air lines, the air lines comprise a first two-position two-way valve (8), a second two-position two-way valve (9), a third two-position two-way valve (10), a fourth two-position two-way valve (11), a fifth two-position two-way valve (12) and two secondary cylinders (13), the main cylinder (22) is communicated with the air lines through the air filter (5), the regulating valve (6), the flow meter and the proportional regulating valves (7), and an air outlet of the proportional regulating valves (7) is connected with the first two-position two-way valve (8) and the second two-position two-way valve (9);
the air outlet of the first two-position two-way valve (8) is connected with a secondary cylinder (13), and the air outlet of the secondary cylinder (13) is connected with an air port (4);
the air outlet of the second two-position two-way valve (9) is respectively connected with a third two-position two-way valve (10) and a fourth two-position two-way valve (11);
the air outlet connecting air port (4) of the third two-position two-way valve (10) is connected with another secondary cylinder (13) through the tested electro-pneumatic valve, and the air outlet of the other secondary cylinder (13) is connected with a fifth two-position two-way valve (12);
and air outlets of the fourth two-position two-way valve (11) and the fifth two-position two-way valve (12) are both connected with silencers.
3. The electro-pneumatic valve detection test bed according to claim 2, wherein the collection unit comprises a data collection card, a plurality of pressure sensors (15) and a high-frequency pressure sensor (16), and the output ends of the pressure sensors (15) and the high-frequency pressure sensor (16) are connected with the input end of the data collection card;
pressure sensors (15) are respectively arranged at the positions of the main cylinder (22) and the two secondary cylinders (13), and the high-frequency pressure sensor (16) is arranged at the position of an air outlet of the tested electro-pneumatic valve.
4. The electric air valve detection test bed according to claim 3, wherein the control unit comprises an industrial personal computer (17) and a display (18), the industrial personal computer (17) is connected with a lower computer (19) through an RS232 communication module, the IO port of the lower computer (19) is connected with a plurality of relays (20), the coils of the relays (20) are connected with the IO port of the lower computer (19), and normally open contacts are respectively connected with the regulating valve (6), the proportional regulating valve (7), the first two-position two-way valve (8), the second two-position two-way valve (9), the third two-position two-way valve (10), the fourth two-position two-way valve (11), the fifth two-position two-way valve (12), the pressure sensor (15) and the high-frequency pressure sensor (16).
5. The electric pneumatic valve detection test bed according to claim 4, wherein the conversion module (3) is a convex plate body, a circular through hole is formed in the side surface of the conversion module (3), a bolt is arranged in the through hole, the conversion module (3) and the electric pneumatic valve to be detected are fixed through the bolt, the display (18) is embedded in the upper portion of the cabinet body (1), and a cabinet door (21) is hinged to the lower portion of the cabinet body (1).
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| CN202010654580.1A CN111638021B (en) | 2020-07-09 | 2020-07-09 | Electric air valve detection test bed |
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| CN202010654580.1A CN111638021B (en) | 2020-07-09 | 2020-07-09 | Electric air valve detection test bed |
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