1. A rail vehicle anti-skid system test bed is characterized by comprising a circuit board, a relay group, an acquisition circuit and a digital-to-analog conversion module;

the circuit board is provided with a circuit board speed sensor interface, a circuit board electronic exhaust valve interface, a circuit board pressure relay interface and a circuit board computer control interface;

the circuit board speed sensor interface is used for connecting at least one speed sensor;

the circuit board electronic exhaust valve interface is used for connecting at least one electronic exhaust valve;

the circuit board pressure relay interface is used for connecting a pressure relay;

the circuit board computer control interface is used for connecting a computer;

the relay group is respectively connected with the circuit board speed sensor interface, the circuit board electronic exhaust valve interface and the circuit board pressure relay interface;

the relay group is also connected with the digital-to-analog conversion module through the acquisition circuit;

the digital-to-analog conversion module is also connected with the circuit board computer control interface.

2. The railway vehicle anti-skid system test stand of claim 1, further comprising a 12V power module connected to the circuit board; or the acquisition circuit and the digital-to-analog conversion module are both arranged on the circuit board; or, still include the frame, the circuit board, the relay group, acquisition circuit and digital-to-analog conversion module all sets up in the frame.

3. The rail vehicle anti-skid system test stand of claim 2, further comprising the computer.

4. The railway vehicle anti-skid system test stand of claim 3, further comprising a printer connected to the computer.

5. The railway vehicle anti-skid system test stand of claim 3, wherein the computer is a tablet computer, a notebook computer, a PC, a 12V industrial personal computer or an NT series touch display screen.

6. Rail vehicle anti-skid system test stand according to any one of claims 1 to 5,

the relay group comprises a cable connection relay group, a signal output relay group and a measurement output relay group;

the cable connection relay group is respectively connected with the circuit board speed sensor interface, the circuit board electronic exhaust valve interface and the circuit board pressure relay interface;

the signal output relay group is respectively used for connecting a 500V high-voltage measurement signal source, a 3V direct current measurement signal source and a 12V alternating current measurement signal source;

the measurement output relay group is respectively connected with the cable connection relay group;

the measurement output relay group is also connected with the digital-to-analog conversion module through the acquisition circuit;

the digital-to-analog conversion module is also connected with the circuit board computer control interface.

7. The railway vehicle anti-skid system test stand of claim 6, wherein the number of 16 relay arrays in the cable connection relay set is set according to the number of measuring component cables;

and setting the number of the 3-path measuring relays in the measuring output relay group according to the measured number.

8. The rail vehicle anti-skid system test stand of claim 6, wherein the cable connection relay set further comprises two 16-way relay arrays and one 1-way relay array;

the signal output relay group comprises three 3-path signal relays;

the measurement output relay group comprises a 3-path electronic exhaust measurement relay, a 3-path pressure relay measurement relay and a 3-path speed sensor measurement relay;

the acquisition circuit comprises a high-voltage insulation resistance acquisition circuit, a resistance acquisition circuit and an inductance acquisition circuit;

the first 16-path relay array is respectively connected with the circuit board electronic exhaust valve interface and the 3-path electronic exhaust measuring relay, the 1-path relay array is respectively connected with the circuit board pressure relay interface and the 3-path pressure relay measuring relay, and the second 16-path relay array is respectively connected with the circuit board speed sensor interface and the 3-path speed sensor measuring relay;

each of the 3-path signal relays is respectively used for connecting the 500V high-voltage measurement signal source, the 3V direct-current measurement signal source and the 12V alternating-current measurement signal source, in addition, the first 3-path signal relay is connected with the first 16-path relay array, the second 3-path signal relay is connected with the 1-path relay array, and the third 3-path signal relay is connected with the second 16-path relay array;

the 3-path electronic air exhaust measuring relay is also respectively connected with the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit;

the 3-path pressure relay measuring relay is also respectively connected with the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit;

the 3-path speed sensor measuring relay is also respectively connected with the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit;

the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit are also respectively connected with the digital-to-analog conversion module.

9. The railway vehicle anti-skid system test stand of claim 8, wherein each of the 16-way relay array, the 1-way relay array, each of the 3-way signal relays, the 3-way electronic air exhaust measuring relay, the 3-way pressure relay measuring relay and the 3-way speed sensor measuring relay are disposed on the circuit board.

10. The rail vehicle anti-skid system test stand of claim 8, further comprising the 500V high voltage signal source, the 3V dc signal source, and the 12V ac signal source.

Background

At present, a large number of electronic anti-skid systems are adopted in the railway and rail transportation industry, and the accurate control of the slip rate between a vehicle wheel set and a steel rail during braking and deceleration is realized, so that the high-speed, safe and punctual technical foundation of the modern railway passenger car is laid. Therefore, when the vehicle is overhauled, the electrical performance of key components of the antiskid system, such as a speed sensor, an electronic exhaust valve and an air pressure relay, needs to be checked, namely, the resistance value and the inductive reactance of an internal coil of the antiskid system, the insulation resistance of a connecting cable and other parameters are measured.

However, because the number of the grouped passenger cars is large, 4 groups of exhaust valves, 4 groups of speed sensors and one pressure relay of each passenger car need to be respectively calibrated in terms of electrical performance during maintenance, and the workload is large. Particularly, at present, a front-line worker generally adopts a mechanical insulation resistance meter and a digital multimeter to perform calibration work, and the front-line worker has the disadvantages of more labor, long time consumption and extremely low detection efficiency. And the test output voltage of 500V of the insulation resistance meter and the about 2V measurement voltage of the digital multimeter cannot be in parallel physical connection, so that the prior art cannot realize the generalized detection of the components and the integrated design of test equipment. The internal principle of the component is shown in fig. 1, wherein, an electronic exhaust valve 101 is provided with a pilot air charging movable iron core 102, an exhaust port 103, a pilot air discharging movable iron core 104, an air discharging electromagnetic valve iron core 106 and an air charging electromagnetic valve iron core 112, an air brake pressure output device 113 outputs air brake pressure which sequentially passes through the pilot air charging movable iron core 102 and the pilot air discharging movable iron core 104 and then is output to a passenger car air brake cylinder 105, and the pilot air discharging movable iron core 104 discharges redundant air to the atmosphere through the exhaust port 103; the exhaust solenoid valve core 106 and the charging solenoid valve core 112 are connected to a first common line 109, respectively; the air exhaust solenoid valve iron core 106 is also connected with an air exhaust line 107, and the air charging solenoid valve iron core 112 is also connected with an air charging line 110; the electronic exhaust valve 101 is also provided with a first metal shell connecting line 108 and a second metal shell connecting line 111; the metal case first connection line 108 and the metal case second connection line 111 may be separated or combined.

The speed sensor is realized in the principle shown in fig. 2, wherein the vehicle wheel pair 201 has a magnetic gear 202, the sensing structure of the speed sensor 203 faces the magnetic gear 202, and the speed sensor 203 is provided with a positive line 204, a negative line 205, a speed output line 206 and a third connecting line 207 of a metal shell; namely a positive line 204, a negative line 205, a speed output line 206 and a third connection line 207 of the metal casing, namely a positive, -S, PE.

The pressure relay is realized in the principle shown in fig. 3, wherein a pressure pipeline 301 is connected with a pressure relay 302, and the pressure relay 302 is provided with a metal shell fourth connecting line 303, a second common line 304, a normally open line 305 and a normally closed line 306; namely, the metal case fourth connection line 303, the second common line 304, the normally open line 305, and the normally closed line 306, namely, D, K, B, PE.

Therefore, in the vehicle maintenance, the electronic exhaust valves, the speed sensors, the insulation resistance of the pressure relay, the internal resistance of the accessories such as the resistance, the inductance such as the inductive reactance, and the like are all realized by adopting a large number of relays or relay arrays, and further, the equipment composition is complex and the price is high.

However, as mentioned above, the vehicle maintenance calibration work has the defects of much labor, long time consumption, extremely low detection efficiency, complex equipment composition, high price and the like, and particularly for the electronic antiskid system of the railway passenger car, because the parts of the electronic antiskid system are improved for many times, the sizes and parameters of the parts after each improvement are changed, so that the parts of the antiskid system are required to be matched for use in railway maintenance procedures, and the parts of different antiskid systems cannot be exchanged, so that the traditional mode and equipment cannot be used for operation organization on site, and the technical bias that designers can only manually operate one-by-one detection but cannot automatically detect exists, so that the prior art has the defects and needs to be improved.

Disclosure of Invention

The invention provides a railway vehicle antiskid system test bed, which aims to solve the technical problems that: how to provide the rail vehicle antiskid system test bench of simplification, reduce the manual work, accelerate detection etc..

The technical scheme of the invention is as follows: a rail vehicle anti-skid system test bed comprises a circuit board, a relay group, an acquisition circuit and a digital-to-analog conversion module; the circuit board is provided with a circuit board speed sensor interface, a circuit board electronic exhaust valve interface, a circuit board pressure relay interface and a circuit board computer control interface; the circuit board speed sensor interface is used for connecting at least one speed sensor; the circuit board electronic exhaust valve interface is used for connecting at least one electronic exhaust valve; the circuit board pressure relay interface is used for connecting a pressure relay; the circuit board computer control interface is used for connecting a computer; the relay group is respectively connected with the circuit board speed sensor interface, the circuit board electronic exhaust valve interface and the circuit board pressure relay interface; the relay group is also connected with the digital-to-analog conversion module through an acquisition circuit; the digital-to-analog conversion module is also connected with a computer control interface of the circuit board.

Preferably, the rail vehicle anti-skid system test bed further comprises a 12V power module connected with the circuit board; or the acquisition circuit and the digital-to-analog conversion module are arranged on the circuit board; or, the rail vehicle anti-skid system test stand further comprises a rack, and the circuit board, the relay group, the acquisition circuit and the digital-to-analog conversion module are all arranged on the rack. Preferably, the rail vehicle anti-skid system test stand further comprises a computer. Preferably, the railway vehicle antiskid system test bed further comprises a printer connected with the computer. Preferably, the computer is a tablet computer, a notebook computer, a PC, a 12V industrial personal computer or an NT series touch display screen.

Preferably, the relay group comprises a cable connection relay group, a signal output relay group and a measurement output relay group; the cable connection relay group is respectively connected with the circuit board speed sensor interface, the circuit board electronic exhaust valve interface and the circuit board pressure relay interface; the signal output relay group is respectively used for connecting a 500V high-voltage measurement signal source, a 3V direct current measurement signal source and a 12V alternating current measurement signal source; the measurement output relay group is respectively connected with the cable connection relay group; the measurement output relay group is also connected with the digital-to-analog conversion module through an acquisition circuit; the digital-to-analog conversion module is also connected with a computer control interface of the circuit board. Preferably, the number of 16 relay arrays in the cable connection relay group is set according to the number of cables of the measuring component; and setting the number of the 3-path measuring relays in the measuring output relay group according to the measured number.

Preferably, the cable connection relay group further comprises two 16-way relay arrays and a 1-way relay array; the signal output relay group comprises three 3-path signal relays; the measurement output relay group comprises a 3-path electronic air exhaust measurement relay, a 3-path pressure relay measurement relay and a 3-path speed sensor measurement relay; the acquisition circuit comprises a high-voltage insulation resistance acquisition circuit, a resistance acquisition circuit and an inductance acquisition circuit; the first 16-path relay array is respectively connected with a circuit board electronic exhaust valve interface and a 3-path electronic exhaust measuring relay, the 1-path relay array is respectively connected with a circuit board pressure relay interface and a 3-path pressure relay measuring relay, and the second 16-path relay array is respectively connected with a circuit board speed sensor interface and a 3-path speed sensor measuring relay; each 3-path signal relay is respectively used for connecting a 500V high-voltage measurement signal source, a 3V direct-current measurement signal source and a 12V alternating-current measurement signal source, the first 3-path signal relay is connected with the first 16-path relay array, the second 3-path signal relay is connected with the 1-path relay array, and the third 3-path signal relay is connected with the second 16-path relay array; the 3 paths of electronic air exhaust measuring relays are also respectively connected with a high-voltage insulation resistance acquisition circuit, a resistance acquisition circuit and an inductance acquisition circuit; the 3-path pressure relay measuring relay is also respectively connected with a high-voltage insulation resistance acquisition circuit, a resistance acquisition circuit and an inductance acquisition circuit; the 3-path speed sensor measuring relay is also respectively connected with a high-voltage insulation resistance acquisition circuit, a resistance acquisition circuit and an inductance acquisition circuit; the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit are also respectively connected with the digital-to-analog conversion module.

Preferably, each 16-path relay array, 1-path relay array, each 3-path signal relay, 3-path electronic exhaust measuring relay, 3-path pressure relay measuring relay and 3-path speed sensor measuring relay are arranged on the circuit board.

Preferably, the rail vehicle anti-skid system test bed further comprises a 500V high-voltage signal source, a 3V direct current signal source and a 12V alternating current signal source.

By adopting the scheme, the invention overcomes the technical bias of technicians, provides the simplified test bed for the anti-skid system of the railway vehicle, can be suitable for detecting components among different anti-skid systems, has lower cost, is easy to increase the number of cables and measurement items of measurement components, and has higher compatibility; and only need the interface of connecting the circuit board can, convenient to use has reduced manual operation, measures fast, has improved detection efficiency, has very high market using value.

Drawings

FIG. 1 is a schematic diagram of an implementation principle of an electronic exhaust valve in the prior art;

FIG. 2 is a schematic diagram of a prior art speed sensor implementation;

FIG. 3 is a schematic diagram of a pressure relay according to the prior art;

FIG. 4 is a schematic view of a test part connection according to one embodiment of the present invention;

FIG. 5 is a schematic diagram of the connection principle of another embodiment of the present invention;

FIG. 6 is a schematic diagram of a resistance measurement circuit according to another embodiment of the present invention;

FIG. 7 is a schematic diagram of an inductive reactance measurement circuit according to another embodiment of the present invention;

FIG. 8 is a schematic view of a test part connection according to another embodiment of the present invention;

FIG. 9 is a schematic diagram of a switching circuit of the relay of the embodiment shown in FIG. 8;

FIG. 10 is a schematic diagram of a relay connection according to another embodiment of the present invention;

FIG. 11 is a schematic diagram of a relay connection according to another embodiment of the present invention;

FIG. 12 is a schematic view of the internal workflow of a test stand according to another embodiment of the present invention;

FIG. 13 is a schematic diagram of the parallel operation of three service flows of another embodiment of the present invention;

FIG. 14 is a schematic view of a speed sensor insulation resistance test assembly according to another embodiment of the present invention;

FIG. 15 is a schematic diagram of a tachometer sense resistance test assembly in accordance with another embodiment of the present invention;

FIG. 16 is a schematic diagram of a velocity sensor inductive reactance test combination according to another embodiment of the present invention;

FIG. 17 is a schematic view of an insulation resistance testing assembly of an electronic air bleeding valve according to another embodiment of the present invention;

FIG. 18 is a schematic view of an inductive reactance testing assembly of an electronic exhaust valve according to another embodiment of the present invention;

FIG. 19 is a schematic view of a resistance testing assembly of an electronic exhaust valve according to another embodiment of the present invention;

FIG. 20 is a schematic diagram of a pressure relay insulation resistance test assembly according to another embodiment of the present invention;

FIG. 21 is a schematic diagram of a pressure relay resistance test assembly according to another embodiment of the present invention;

FIG. 22 is a schematic view of a test stand configuration and connections according to another embodiment of the present invention;

FIG. 23 is a schematic view of a test stand according to another embodiment of the present invention;

FIG. 24 is a schematic view of a test stand movement test according to another embodiment of the present invention;

in the figure: an electronic exhaust valve 101, a pilot air charging movable core 102, an exhaust outlet 103, a pilot air discharging movable core 104, a passenger car air brake cylinder 105, an exhaust solenoid valve core 106, an exhaust line 107, a metal casing first connection line 108, a first common line 109, an air charging line 110, a metal casing second connection line 111, an air charging solenoid valve core 112, an air brake pressure output device 113, a vehicle wheel pair 201, a magnetic gear 202, a speed sensor 203, a positive line 204, a negative line 205, a speed output line 206, a metal casing third connection line 207, a pressure pipeline 301, a pressure relay 302, a metal casing fourth connection line 303, a second common line 304, a normally open line 305, a normally closed line 306, a first electronic exhaust valve 401, a second electronic exhaust valve 402, a third electronic exhaust valve 403, a fourth electronic exhaust valve 404, a first speed sensor 405, a third speed sensor 406, a third speed sensor 407, a second electronic exhaust valve 401, a third speed sensor 107, a third speed sensor 407, a third speed sensor, A fourth speed sensor 408, a circuit board 409, a pressure relay 410, a first voltage sampling location 501, a second voltage sampling location 502, a relay normally closed point 503, a relay normally open point 504, and a signal common 505.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. One embodiment of the invention is a railway vehicle anti-skid system test bed, which comprises a circuit board, a relay group, an acquisition circuit and a digital-to-analog conversion module; the circuit board is provided with a circuit board speed sensor interface, a circuit board electronic exhaust valve interface, a circuit board pressure relay interface and a circuit board computer control interface; the circuit board speed sensor interface is used for connecting at least one speed sensor; the circuit board electronic exhaust valve interface is used for connecting at least one electronic exhaust valve; the circuit board pressure relay interface is used for connecting a pressure relay; the circuit board computer control interface is used for connecting a computer; the relay group is respectively connected with the circuit board speed sensor interface, the circuit board electronic exhaust valve interface and the circuit board pressure relay interface; the relay group is also connected with the digital-to-analog conversion module through the acquisition circuit; the digital-to-analog conversion module is also connected with the circuit board computer control interface. By adopting the scheme, the invention overcomes the technical bias of technicians, provides the simplified test bed for the anti-skid system of the railway vehicle, can be suitable for detecting components among different anti-skid systems, has lower cost, is easy to increase the number of cables and measurement items of measurement components, and has higher compatibility; and only need the interface of connecting the circuit board can, convenient to use has reduced manual operation, measures fast, has improved detection efficiency, has very high market using value.

The invention provides a railway vehicle anti-skid system test bed which comprises a circuit board, a relay group, an acquisition circuit and a digital-to-analog conversion module, wherein the circuit board is connected with the relay group; the relay set can be arranged on the circuit board or separated from the circuit board. The railway vehicle anti-skid system test bed realized by the method is short for a test bed, and has the advantages of simple structure, easiness in connection and stability in operation. However, the conventional relay array technology can only test signals sequentially, that is, 4 groups of electronic exhaust valves shown in fig. 1, four groups of speed sensors shown in fig. 2 and a pressure relay shown in fig. 3 are tested independently, and cables, coil internal resistances, insulation resistances, inductive resistances and the like are tested in one item, that is, the conventional mode needs long time and consumes labor for completing all operations, so that technical personnel have a technical bias that automatic detection cannot be performed.

Preferably, as shown in fig. 4, the acquisition circuit is disposed on a circuit board, that is, the circuit board is an integrated insulation resistance, resistance and inductance test circuit board; the first electronic exhaust valve 401, the second electronic exhaust valve 402, the third electronic exhaust valve 403, the fourth electronic exhaust valve 404, the first speed sensor 405, the second speed sensor 406, the third speed sensor 407, the fourth speed sensor 408 and the pressure relay 410 are respectively connected with the circuit board 409; for example, circuit board 409 may be provided with a circuit board pressure relay interface that connects pressure relay 410. For example, the circuit board electronic exhaust valve interfaces of the circuit board 409 are respectively connected with the first electronic exhaust valve 401, the second electronic exhaust valve 402, the third electronic exhaust valve 403 and the fourth electronic exhaust valve 404; for another example, the circuit board 409 is provided with four circuit board electronic exhaust valve interfaces, and the first electronic exhaust valve 401, the second electronic exhaust valve 402, the third electronic exhaust valve 403, and the fourth electronic exhaust valve 404 are respectively and correspondingly connected to one circuit board electronic exhaust valve interface. For example, the circuit board speed sensor interface of the circuit board 409 is connected with the first speed sensor 405, the second speed sensor 406, the third speed sensor 407 and the fourth speed sensor 408, respectively; for another example, the circuit board 409 is provided with four circuit board speed sensor interfaces, and the first speed sensor 405, the second speed sensor 406, the third speed sensor 407, and the fourth speed sensor 408 are respectively connected to one circuit board speed sensor interface correspondingly. Above-mentioned structure provides the rail vehicle anti-skidding system test bench of simplifying, can be applicable to the detection of part between different anti-skidding systems, and the cost is lower, only need during the use even the interface of circuit board can, convenient to use has reduced manual operation, measures fast, has improved detection efficiency.

Preferably, the circuit board computer control interface is used for connecting a computer; preferably, the rail vehicle anti-skid system test stand further comprises a computer. Preferably, the computer is a tablet computer, a notebook computer, a PC, a 12V industrial personal computer or an NT series touch display screen. Preferably, the railway vehicle antiskid system test bed further comprises a printer connected with the computer. Therefore, the detection result can be formed into a text report and quickly output; and the defect that the prior art has the bias that the prior art can only manually operate one-by-one detection but cannot automatically detect is overcome, and the detection efficiency is greatly improved.

Preferably, the relay group is respectively connected with the circuit board speed sensor interface, the circuit board electronic exhaust valve interface and the circuit board pressure relay interface; the relay group is also connected with the digital-to-analog conversion module through an acquisition circuit; preferably, the rail vehicle anti-skid system test bed further comprises a 12V power module connected with the circuit board; preferably, the acquisition circuit and the digital-to-analog conversion module are both arranged on the circuit board; preferably, the test bed for the anti-skid system of the rail vehicle further comprises a rack, and the circuit board, the relay group, the acquisition circuit and the digital-to-analog conversion module are all arranged on the rack. Preferably, the rail vehicle anti-skid system test bed further comprises a machine table, and the rack is arranged on the machine table; or the circuit board, the relay group, the acquisition circuit and the digital-to-analog conversion module are all arranged on the machine. Therefore, the rail vehicle anti-skid system test bed can be conveniently moved.

In the prior art, the test is only carried out when the product leaves a factory, namely, the test result is only suitable for a new product manufacturing link, namely, after a new product accessory is manufactured, a forward flow detection mode is adopted, different flow links are set for different test items, and forward production, detection and manufacturing are carried out; however, after the application, the parts of the electronic anti-skid system of the railway passenger car are improved for at least more than 5 times to adapt to the speed increase or speed regulation of the passenger car, the sizes and parameters of the parts after each improvement are changed, so the parts of the anti-skid system are required to be matched for use in railway maintenance procedures, the electronic exhaust valve, the speed sensor and the pressure relay are required to be matched for use, but the parts of different anti-skid systems cannot be interchanged, so the traditional mode and equipment cannot be used on site for operation organization, and no matched test stand products exist in the market, which is also the cause of the technical prejudice of the technical personnel. Preferably, the relay group comprises a cable connection relay group, a signal output relay group and a measurement output relay group; the cable connection relay group is respectively connected with the circuit board speed sensor interface, the circuit board electronic exhaust valve interface and the circuit board pressure relay interface; the signal output relay group is respectively used for connecting a 500V high-voltage measurement signal source, a 3V direct current measurement signal source and a 12V alternating current measurement signal source; the measurement output relay group is respectively connected with the cable connection relay group; the measurement output relay group is also connected with the digital-to-analog conversion module through an acquisition circuit; the digital-to-analog conversion module is also connected with a computer control interface of the circuit board. Preferably, the rail vehicle anti-skid system test bed further comprises a 500V high-voltage signal source, a 3V direct current signal source and a 12V alternating current signal source. From ohm's law:

the current flowing in the current-limiting sampling resistor is equal to (the voltage of the first voltage sampling position-the voltage of the second voltage sampling position)/the resistance value of the current-limiting sampling resistor, and the current value is the total current flowing through the circuit;

the current flowing through the sampling resistor is equal to the voltage of the second voltage sampling position/the resistance value of the sampling resistor;

the current flowing through the cable to be tested is the total current-the current flowing through the sampling resistor;

and the resistance value of the cable to be tested is equal to the voltage of the second voltage sampling position/the current of the cable to be tested.

Generally, the working voltage of an antiskid part in an antiskid system is 48V and 24V, and according to the requirement of railway passenger car electrical equipment maintenance regulations, 500V high-voltage electricity is needed to carry out insulation resistance voltage-withstanding test on accessories during accessory maintenance. Therefore, the high-voltage measurement signal source adopted by each embodiment of the invention is a 500V high-voltage measurement signal source.

Generally, the resistance value of the coil of the antiskid component in the antiskid system is in the range of 60 Ω to 2000 Ω, and 3V/60 Ω is 0.05A, so that the coil of the accessory cannot be burnt by the measuring signal, and the accessory cannot be operated due to too high voltage, and the value is a preferable value; therefore, the direct current measurement signal source adopted by each embodiment of the invention is a 3V direct current measurement signal source.

The inductance value test circuit of the accessory coil is the same as the resistance, and the pure inductance calculation formula is L ═ U/(XL), wherein XL is inductive reactance, correspondingly, XL ═ ω L, wherein ω is angular frequency and is equal to 2 pi f; f is frequency, L is inductance; the inductive reactance of 1mH at AC12V50Hz is: 2 × 3.14 × 50 × 0.005 ═ 1.57 Ω. Generally, since the lowest operating voltage of the accessory coil is DC24V and the coil inductance is 200mH to 400mH, the current I in the cable test circuit is selected to be AC12V50Hz/(1.57 × 200) to be 0.038A, so as to guarantee the measurement accuracy to the maximum extent. Therefore, the ac signal source used in the various embodiments of the present invention is a 12v ac signal source. Preferably, the 500V high voltage signal source, the 3V direct current signal source and the 12V alternating current signal source are physically isolated, that is, the DC500V high voltage, the DC3V direct current and the AC12V alternating current signals are completely physically isolated, and preferably, the number of the 16 relay arrays in the cable connection relay group is set according to the number of the cables of the measuring component; and setting the number of the 3-path measuring relays in the measuring output relay group according to the measured number. Therefore, the detection requirements can be flexibly met, the number of cables and measurement items of measurement components can be easily increased, and the compatibility is high; the test bed can also be conveniently updated.

Preferably, the cable connection relay group further comprises two 16-path relay arrays and a 1-path relay array; the signal output relay group comprises three 3-path signal relays; the measurement output relay group comprises a 3-path electronic exhaust measurement relay, a 3-path pressure relay measurement relay and a 3-path speed sensor measurement relay; the acquisition circuit comprises a high-voltage insulation resistance acquisition circuit, a resistance acquisition circuit and an inductance acquisition circuit; the first 16-path relay array is respectively connected with the circuit board electronic exhaust valve interface and the 3-path electronic exhaust measuring relay, the 1-path relay array is respectively connected with the circuit board pressure relay interface and the 3-path pressure relay measuring relay, and the second 16-path relay array is respectively connected with the circuit board speed sensor interface and the 3-path speed sensor measuring relay; each of the 3-path signal relays is respectively used for connecting the 500V high-voltage measurement signal source, the 3V direct-current measurement signal source and the 12V alternating-current measurement signal source, in addition, the first 3-path signal relay is connected with the first 16-path relay array, the second 3-path signal relay is connected with the 1-path relay array, and the third 3-path signal relay is connected with the second 16-path relay array; the 3-path electronic air exhaust measuring relay is also respectively connected with the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit; the 3-path pressure relay measuring relay is also respectively connected with the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit; the 3-path speed sensor measuring relay is also respectively connected with the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit; the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit are also respectively connected with the digital-to-analog conversion module.

Preferably, as shown in fig. 5, the electronic exhaust valve is connected to a first 16-way relay array through a circuit board electronic exhaust valve interface, the pressure relay is connected to the 1-way relay array through a circuit board pressure relay interface, the speed sensor is connected to a second 16-way relay array through a circuit board speed sensor interface, a first 3-way signal relay is connected to the first 16-way relay array, and is further connected to a 500V high-voltage measurement signal source to obtain a 500V high-voltage measurement signal, and is further connected to a 3V direct-current measurement signal source to obtain a 3V direct-current measurement signal, and is further connected to a 12V alternating-current measurement signal source to obtain a 12V alternating-current measurement signal; the second 3-path signal relay is connected with the 1-path relay array, is also connected with a 500V high-voltage measurement signal source to obtain a 500V high-voltage measurement signal, is also connected with a 3V direct-current measurement signal source to obtain a 3V direct-current measurement signal, and is also connected with a 12V alternating-current measurement signal source to obtain a 12V alternating-current measurement signal; the third 3-path signal relay is connected with the second 16-path relay array, is also connected with a 500V high-voltage measurement signal source to obtain a 500V high-voltage measurement signal, is also connected with a 3V direct-current measurement signal source to obtain a 3V direct-current measurement signal, and is also connected with a 12V alternating-current measurement signal source to obtain a 12V alternating-current measurement signal; the first 16-path relay array is also connected with 3 paths of electronic exhaust measuring relays, the 1-path relay array is also connected with 3 paths of pressure relay measuring relays, and the second 16-path relay array is also connected with 3 paths of speed sensor measuring relays; the 3 paths of electronic air exhaust measuring relays are also respectively connected with a high-voltage insulation resistance acquisition circuit, a resistance acquisition circuit and an inductance acquisition circuit; the 3-path pressure relay measuring relay is also respectively connected with a high-voltage insulation resistance acquisition circuit, a resistance acquisition circuit and an inductance acquisition circuit; the 3-path speed sensor measuring relay is also respectively connected with a high-voltage insulation resistance acquisition circuit, a resistance acquisition circuit and an inductance acquisition circuit; the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit are also respectively connected with a 4-channel 24-bit ADC acquisition chip serving as a digital-to-analog conversion module.

Preferably, each 16-path relay array, 1-path relay array, each 3-path signal relay, 3-path electronic exhaust measuring relay, 3-path pressure relay measuring relay and 3-path speed sensor measuring relay are arranged on the circuit board. Therefore, the integration level can be improved, and the circuit board and the test bed can be conveniently and integrally moved.

When measuring the insulation resistance between the electric accessory, the cable and the ground or the metal shell and the wire, a high-voltage signal is needed, preferably, as shown in fig. 6, the high-voltage signal source is a 500V high-voltage signal source, the high-voltage insulation resistance acquisition circuit comprises a sampling resistor and a current-limiting sampling resistor, a first end of the current-limiting sampling resistor is connected with a first end of the 500V high-voltage signal source, a first end of the sampling resistor is connected with a second end of the 500V high-voltage signal source and a second end of the cable to be measured, and a second end of the current-limiting sampling resistor is respectively connected with the second end of the sampling resistor and the first end of the cable to be measured; the first end and the second end of the current-limiting sampling resistor are respectively used as a first voltage sampling position 501 and a second voltage sampling position 502 which are connected with the digital-to-analog conversion module; as shown in fig. 7, the inductor acquisition circuit includes a sampling inductor and a current-limiting sampling inductor, a first end of the current-limiting sampling inductor is connected to a first end of the 12v ac signal source, a first end of the sampling inductor is connected to a second end of the 12v ac signal source and a second end of the cable to be tested, and a second end of the current-limiting sampling inductor is connected to the second end of the sampling inductor and the first end of the cable to be tested, respectively; the first end and the second end of the current-limiting sampling inductor are respectively used as a first voltage sampling position 501 and a second voltage sampling position 502 which are connected with the digital-to-analog conversion module. The high-voltage insulation resistance acquisition circuit and the inductance acquisition circuit have the advantages of simplicity and high efficiency, and can be used for manufacturing a highly integrated novel electric performance test bed of an electronic anti-skid component of a passenger car, namely a test bed of an anti-skid system of a railway vehicle; the relay optimization arrangement of each embodiment is matched, the parallel operation of three maintenance processes is realized, the defect that the conventional equipment can only operate in a single-line manual sequence process is overcome, the detection efficiency is greatly improved, and the automatic detection becomes possible.

Because the relays are all provided with normally open contacts and normally closed contacts, the relays are turned over after being electrified, the connection mode of the relays and a 16-path relay array is described below by taking exhaust valves as an example, preferably, the connection relation between the 16-path relays and a part to be tested is shown in figures 8 and 9, the number of the electronic exhaust valves is four, each electronic exhaust valve is respectively connected with 4 paths of relays in a first 16-path relay array through a circuit board electronic exhaust valve interface, and the first electronic exhaust valve, the second electronic exhaust valve, the third electronic exhaust valve and the fourth electronic exhaust valve are respectively connected with 4 paths of relays in the first 16-path relay array through a circuit board electronic exhaust valve interface, namely the first electronic exhaust valve is connected with 1 to 4 exhaust valve relays in the first 16-path relay array, and the second electronic exhaust valve is connected with 5 to 8 exhaust valve relays in the first 16-path relay array, The third electronic exhaust valve is connected with exhaust valve relays 9 to 12 in the first 16-path relay array, and the fourth electronic exhaust valve is connected with exhaust valve relays 13 to 16 in the first 16-path relay array; taking the first electronic exhaust valve as an example, the exhaust line 107 is connected with the exhaust valve relay 1 (also called as a first exhaust valve relay, and the like), the first common line 109 is connected with the exhaust valve relay 2, the inflation line 110 is connected with the exhaust valve relay 3, and the metal shell first connecting line 108 and the metal shell second connecting line 111 are connected with the exhaust valve relay 4 together; the second electronic exhaust valve, the third electronic exhaust valve and the fourth electronic exhaust valve are similar.

Relay normally-closed points of all exhaust valve relays in the first 16-path relay array are connected with the first 3-path signal relays, namely relay normally-closed points of all relays in the first 16-path relay array are connected with the first 3-path signal relays, namely relay normally-closed points 503 of the exhaust valve relays 1-16 are connected with the first 3-path signal relays, namely exhaust valve relays in the 3-path measuring signal output relays, and can also be called 3-path measuring signal output exhaust valve relays; the first 3-path signal relay is also respectively connected with a 500V high-voltage measurement signal source, a 3V direct-current measurement signal source and a 12V alternating-current measurement signal source to obtain 3-path signal output, which can also be called 3-path measurement signal output; the 500V high voltage measurement signal source can also be called a 3-path signal DC500V, the 3V direct current measurement signal source can also be called a 3-path signal DC3V, and the 12V alternating current measurement signal source can also be called a 3-path signal AC 12V. The relay normally-open points of all the exhaust valve relays in the first 16-path relay array are connected with 3 paths of electronic exhaust measuring relays, namely the relay normally-open points of all the relays in the first 16-path relay array are connected with 3 paths of electronic exhaust measuring relays, namely the relay normally-open points 504 of the exhaust valve relays 1 to 16 are connected with 3 paths of electronic exhaust measuring relays, namely the exhaust valve relays in the 3-path measuring relays and can also be called 3 paths of measuring exhaust valve relays; the 3 paths of electronic air exhaust measuring relays are also respectively connected with a high-voltage insulation resistance collecting circuit, a resistance collecting circuit and an inductance collecting circuit, the high-voltage insulation resistance collecting circuit can also be called an insulation resistance measuring circuit or 3 paths of insulation resistance measuring circuits, the resistance collecting circuit can also be called a resistance measuring circuit or 3 paths of resistance measuring circuits, and the inductance collecting circuit can also be called an inductance measuring circuit or 3 paths of inductance measuring circuits. Preferably, the 3-way signal DC500V, the 3-way signal DC3V, the 3-way signal AC12V, the 3-way insulation resistance measuring circuit, the 3-way resistance measuring circuit and the 3-way inductance measuring circuit are all connected to the signal common line 505.

Preferably, the number of the pressure relays is one, and the pressure relays are connected with 4 relays in the 1-path relay array through circuit board pressure relay interfaces; the relay normally-closed points of all relays in the 1-path relay array are connected with the second 3-path signal relays, and the relay normally-open points of all relays in the 1-path relay array are connected with the 3-path pressure relay measuring relays. Preferably, the number of the speed sensors is four, and each speed sensor is respectively connected with 4 paths of relays in the second 16 paths of relay arrays through a circuit board speed sensor interface; the relay normally-closed points of all relays in the second 16-path relay array are connected with the third 3-path signal relays, and the relay normally-open points of all relays in the second 16-path relay array are connected with the 3-path speed sensor measuring relays. Therefore, the principle that the state is turned over after the relay is powered on can be utilized, when a certain wiring such as a PE wire of a third exhaust valve is in relay action no matter in a first connecting wire 108 of a metal shell or a second connecting wire 111 of the metal shell, for example, the exhaust valve relay 12 is turned over in state, the normal open point of the anti-skid relay in the 3-way relay is separated, the normal close point of the anti-skid relay in the 3-way relay is communicated, the anti-skid relay is communicated with a measuring signal, and the insulation resistance value of a cable or a coil to be measured can be obtained by closing the exhaust valve relays 9, 10 and 11 respectively. And through the relay switching of the circuit, the switching of any signal measurement loop of the air exhaust valve coil and the wiring can be realized, and a loop is formed, so that the insulation resistance measurement, the resistance measurement and the inductance measurement are carried out.

Or, preferably, as shown in fig. 10, the relay normally-open points of the exhaust valve relays in the first 16-way relay array are all connected with the first 3-way signal relays, that is, all connected with 3 output relays; the relay normally-closed points of all the exhaust valve relays in the first 16-path relay array are connected with 3 paths of electronic exhaust measuring relays, namely the relay normally-closed points are connected with 3 measuring relays; the relay normally-open points in the pressure relay 1-path relay array are connected with a second 3-path signal relay, namely the relay normally-open points are connected with 3 output relays; the normally closed points of the relays in the 1-path relay array of the pressure relay are connected with 3 paths of pressure relay measuring relays, namely the relays are connected with 3 measuring relays; the relay normally-open points of all relays in the second 16-path relay array are connected with the third 3-path signal relays, namely the relays are connected with 3 output relays; the relay normally-closed points of all relays in the second 16-path relay array are connected with 3-path speed sensor measuring relays, namely, the relay normally-closed points are connected with 3 measuring relays. In the above embodiment, the connection between the relay normally open point and the relay normally closed point may be interchanged. Each measuring relay is respectively connected with 3 paths of insulation resistance measuring circuits, 3 paths of resistance measuring circuits and 3 paths of inductance measuring circuits, namely a high-voltage insulation resistance collecting circuit, a resistance collecting circuit and an inductance collecting circuit; each output relay is respectively connected with a 3-path signal DC500V, a 3-path signal DC3V and a 3-path signal AC12V, namely a 500V high-voltage measurement signal source, a 3V direct-current measurement signal source and a 12V alternating-current measurement signal source.

Or, preferably, 3 signal relays of the signal output relay group, 3 electronic air exhaust measuring relays of the measuring output relay group, a 3 pressure relay measuring relay and a 3 speed sensor measuring relay, two 16 relay arrays and a 1 relay array, which are specifically connected as shown in fig. 11, the normally open point of each relay in the first 16 relay arrays connected with the electronic air exhaust valve is the normally open point of the 16 relays of the air exhaust valve, and the 3 electronic air exhaust measuring relays are connected with the 3 air exhaust valve measuring relays; the normally closed point of each relay in the first 16-path relay array connected with the electronic exhaust valve is the normally closed point of the 16-path relay of the exhaust valve, and the first 3-path signal relay is connected, namely the 3-path exhaust valve measurement signal output relay; the normally open points of all relays of the 1-path relay array connected with the pressure relay are normally open points of the 1-path relay array of the pressure relay, and are connected with the 3-path pressure relay measuring relays; the normally closed point of each relay of the 1-path relay array connected with the pressure relay is the normally closed point of the 1-path relay of the pressure relay, and the normally closed point is connected with the second 3-path signal relay, namely the measuring signal output relay of the 3-path pressure relay; the normally open points of the relays of the second 16-path relay array connected with the speed sensor are normally open points of the relays of the speed sensor, namely the normally open points of the relays of the speed sensor, and are connected with the measuring relays of the speed sensor of 3 paths; the normally closed point of each relay of the second 16-path relay array connected with the speed sensor is the normally closed point of the 16-path relay of the speed sensor, and the normally closed point is connected with the third 3-path signal relay, namely the measuring signal output relay of the 3-path speed sensor; each 3-path signal relay is respectively connected with 3-path signal sources, namely a 500V high-voltage measurement signal source, a 3V direct-current measurement signal source and a 12V alternating-current measurement signal source; the 3-path electronic air exhaust measuring relay, the 3-path pressure relay measuring relay and the 3-path speed sensor measuring relay are respectively connected with the 3-path measuring circuit, namely the high-voltage insulation resistance acquisition circuit, the resistance acquisition circuit and the inductance acquisition circuit. It can be seen that the 3-way measurement and signal source comprises DC500V insulation resistance, inductance measurements, and the three-way signals are respectively as in relays connected to the respective circuits.

Preferably, in the above embodiment, a total of 16+1+16+3+3+ 42 relays are required. Compared with the existing design scheme, the number of the relays is reduced by more than 50%. The embodiment of the invention is very flexible, the number of cables of measuring parts can be increased by increasing the number of 16 paths of relays, and measuring items can be increased by increasing the number of 3 paths of relays.

The technical effect of the invention is realized by adopting a traditional mode by the following steps.

A speed sensor measuring step: the inductance of 4 groups of speed sensors × 3 groups of insulation resistors +4 groups of speed sensors × 3 groups of inductors is 108 steps. Measuring an electronic exhaust valve: 4 groups of electronic exhaust valves, 3 groups of insulation resistors, 4 groups of electronic exhaust valves, 3 groups of resistors and 4 groups of electronic exhaust valves, and 3 groups of inductors are 108 steps. A pressure relay measuring step: the pressure relay x 3 groups of insulation resistance + the pressure relay x 3 groups of resistance become 6 steps. The test work of the project is finished by adopting a traditional relay combination mode, and the test work needs 222 steps of 108+108+6, namely, the 222 measurement steps are manually operated.

In order to solve the technical problems, 222 measurement steps are manually operated to improve the efficiency, and the mode of respectively designing insulation resistance, resistance and inductance is commonly adopted in the industry at present, namely a passenger car anti-skid component insulation resistance test bench, a passenger car anti-skid component resistance test bench and a passenger car protective component inductance test bench are respectively designed on site. Obviously, the traditional scheme not only increases the volume, the number and the manufacturing cost of the equipment, but also increases the workload of disassembling and clamping the accessories of different test operation pieces of workers and exporting, classifying and processing experimental data, and particularly, the three equipment lack the practical condition that the digitization of the measurement work cannot be realized, so that the work is not automated for a long time. As mentioned above, the parts of the electronic anti-skid system of the railway passenger car are improved for many times, and the parts of different anti-skid systems can not be interchanged, so that the automatic detection can not be realized on site.

According to the embodiment of the invention, through the innovative design of the relay array, the physical separation of DC500V, direct current 3V and 12V alternating current signals and a measuring circuit is realized, and anti-skid components such as an electronic exhaust valve, a speed sensor and a pressure relay array are arranged in groups, so that the parallel processing of the measuring process is realized, preferably, as shown in FIG. 12, when the test is started, 4 groups of electronic exhaust valve insulation resistances are measured, then 4 groups of electronic exhaust valve resistances are measured, and then 4 groups of electronic exhaust valve inductances are measured; measuring the resistance of 4 groups of speed sensors, then measuring the inductance of 4 groups of speed sensors, and then measuring the insulation resistance of 4 groups of speed sensors; measuring the insulation resistance of the pressure relay, and then measuring the resistance of the pressure relay; and (6) completing the test. Preferably, 4 groups of electronic exhaust valve insulation resistance and 4 groups of speed sensor resistance can be synchronously executed, 4 groups of electronic exhaust valve resistance, 4 groups of electronic exhaust valve inductance and pressure relay insulation resistance can be synchronously executed, automatic detection can be realized, and synchronously executed detection items can help to improve detection efficiency, and the device is particularly suitable for being applied to the field environment where trains need to be rapidly detected and maintained. Preferably, after the embodiment of the present invention is used, the testing steps are equivalent to 108 steps for 4 groups of speed sensors × 3 groups of insulation resistors +4 groups of speed sensors × 3 groups of inductors, that is, 114 steps are reduced, which not only reduces the detecting steps, but also helps to realize automatic detection.

After the hardware and the software of the embodiment of the invention are matched, the relay is divided into three parts of cable connection, signal output and measurement output, the cable connection relay is connected with a test component which is an exhaust valve, a speed sensor and a pressure relay, three groups of signal output relay arrays are simultaneously connected with 500V high-voltage, 3V direct current and 12V alternating current signal sources, and the high-voltage insulation acquisition, resistance acquisition and inductance acquisition output ends of the three groups of measurement relays are connected in parallel and then respectively connected to an acquisition circuit, for example, the acquisition circuit is connected to a 4-channel 24-bit ADC digital-to-analog conversion chip. Thereby solving the problems of miniaturization and integration of equipment; specifically, unlike newly manufactured electronic exhaust valves, speed sensors and other components, products after being loaded and used for a period of time are required to be connected in parallel during overhaul and test, namely newly manufactured products such as experiments of electronic exhaust valves, manufacturers only need to set a production line of the electronic exhaust valves, and by adopting the embodiment of the invention, in application conditions such as railway real technical requirements, system matching experiments need to be carried out, namely 3 production lines need to be arranged simultaneously according to a factory production line mode, and the operation can be completed by only one device by adopting the embodiment of the invention, so that the field miniaturization matching experiment requirements are met. Preferably, as shown in fig. 13, the electronic exhaust valve performs an insulation resistance test, the pressure relay performs a resistance test, and the speed sensor performs an inductance test; then, the electronic exhaust valve is used for resistance test, the pressure relay is used for inductance test, and the speed sensor is used for insulation resistance test; then, the electronic exhaust valve performs inductance test, the pressure relay performs insulation resistance test, and the speed sensor performs resistance test; therefore, the 3 pipelines, namely three overhaul flows of the invention can work simultaneously.

Therefore, in the embodiment of the invention, the MCU or the controller comprises three instruction sets of circuit board component control, single component test and all component test, the MCU or the controller can be designed according to field use, the circuit board components can be freely controlled, the computer completes instruction control and data acquisition of all test processes, the computer can also send test instructions of the single component or all components, the circuit board returns data to the computer after completing all test work, the computer performs calculation, or the MCU performs self-calculation according to environmental temperature and humidity data and then sends the data to the computer, namely, the invention can be manufactured into a mobile detection device which is powered by a storage battery and is controlled by an NT touch display screen, and also can be manufactured into a precision measurement professional device which is controlled by a high-performance computer.

The following gives a concrete implementation of the rail vehicle anti-skid system test stand to measure the passenger vehicle electronic anti-skid device components, which can be performed, for example, in the following manner: the speed sensor insulation resistance test combination is shown in fig. 14, the speed sensor resistance test combination is shown in fig. 15, and the speed sensor inductance resistance test combination, that is, the inductance test combination is shown in fig. 16; the insulation resistance test combination of the electronic exhaust valve is shown in fig. 17, the inductive reactance test combination of the electronic exhaust valve is shown in fig. 18, and the resistance test combination of the electronic exhaust valve is shown in fig. 19; the pressure relay insulation resistance test combination is shown in fig. 20, and the pressure relay resistance test combination is shown in fig. 21. The test bed structure and connection of one embodiment is shown in fig. 22, the test bed comprises a circuit board speed sensor interface, a circuit board electronic exhaust valve interface, a circuit board pressure relay interface and a circuit board computer control interface; the circuit board speed sensor interfaces are respectively connected with four speed sensors, namely speed sensors 1 to 4; the electronic air exhaust valve interface of the circuit board is respectively connected with four electronic air exhaust valves, namely the electronic air exhaust valves 1 to 4; the circuit board pressure relay interface is connected with a pressure relay; the circuit board computer control interface is connected with a computer; the circuit board speed sensor interface, the circuit board electronic exhaust valve interface, the circuit board pressure relay interface and the circuit board computer control interface are integrated on the PCB. Preferably, in the railway vehicle anti-skid system test bed, the circuit board is further provided with a circuit board temperature and humidity sensor interface, and the circuit board temperature and humidity sensor interface is used for connecting at least one temperature and humidity sensor; the relay group is also connected with a temperature and humidity sensor interface of the circuit board and used for transmitting the detection information of the temperature and humidity sensor to the digital-to-analog conversion module through the acquisition circuit. The test bed structure of another embodiment is shown in fig. 23, and similarly, a circuit board speed sensor interface, a circuit board electronic exhaust valve interface, a circuit board pressure relay interface, a circuit board temperature and humidity sensor interface, and a circuit board computer control interface are all integrated on a circuit board, the speed sensor, the electronic exhaust valve, the pressure relay, and the temperature and humidity sensor are respectively connected to the circuit board, and for a fixed position or a position capable of being connected with 220V power supply, an alternating current 220V power supply respectively supplies power to a computer and a printer, and the computer is respectively connected with the printer and the circuit board; the 12V power module supplies power for the circuit board. For the movement detection, the test bed structure of another embodiment is shown in fig. 24, a 12V power supply module supplies power to a 12V industrial personal computer or an NT touch display screen and also supplies power to a circuit board, and a speed sensor, an electronic exhaust valve, a pressure relay and a temperature and humidity sensor are respectively connected to the circuit board.

Furthermore, the embodiment of the invention also comprises a railway vehicle antiskid system test bed formed by mutually combining the technical characteristics of the above embodiments. The technical features mentioned above are combined with each other to form various embodiments which are not listed above, and all of them are regarded as the scope of the present invention described in the specification; also, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.