CR200J motor train unit double-window mitigation indicator test tool

Abstract

The utility model discloses a CR200J motor train unit double-window mitigation indicator test tool, and relates to the field of railway transportation. The device is composed of a gas circuit control main valve, a wind pressure adjusting unit, a pneumatic clamping unit, a pressure detection unit, an execution unit, a control unit and a power module, the control unit is divided into a manual control unit and an automatic control unit, and accurate and rapid adjustment of wind pressure is achieved through an electric control proportional valve; pneumatic clamping is adopted between the tested workpiece and the testing device, so that the operation time is shortened; test steps are programmed through a microcomputer, operation is simplified, and the influence of human factors on test results is reduced. The CR200J motor train unit double-window mitigation indicator test tool provided by the utility model is accurate, rapid and stable in wind pressure adjustment, rapid and convenient in connection of the tested workpiece and the test device, short in operation time, simple in operation and accurate in test.

Description

Technical Field

[0001] The utility model relates to the field of railway transportation, in particular to a test tool for a double-window relief indicator of a CR200J electric train set. Background Art

[0002] With the rapid development of my country's rail transit, in order to further maximize the benefits of operating passenger trains on existing lines and improve transportation efficiency, the number of CR200J EMUs in operation has increased year by year since they were put into operation. The double-window relief indicator is installed on the inner side of the middle skirt of the CR200J passenger car, one on each side of the passenger car. It has two indication windows, the air brake window is used to indicate the air brake or relief status, and the parking brake window is used to indicate the parking brake or relief status.

[0003] As the operating hours and mileage of CR200J EMUs increase, drum-type vehicles equipped with dual-window relief indicators have gradually entered the D4 maintenance cycle. According to the "Technical Regulations for Maintenance of CR200J Centralized Power EMUs" (D4), dual-window relief indicators must undergo wind pressure and sensitivity testing after repair and assembly. Newly purchased products must also undergo testing to ensure their performance meets requirements. However, there is currently no testing equipment for dual-window relief indicators.

[0004] The existing technology uses a mechanical pressure regulating valve to adjust the air pressure, which has low adjustment accuracy and unstable air pressure; the tested workpiece and the test device use the original threaded connection, which is troublesome to install and disassemble during the test and takes a long time; it needs to be manually operated during use, using a stopwatch for timing, and at the same time, it is necessary to observe and record the pressure gauge value, which is complicated to operate and distracts attention. The test results are affected by human factors. Summary of the Invention

[0005] The purpose of the utility model is to provide a test fixture for the double-window relief indicator of an electric multiple unit, so as to realize the test of the double-window relief indicator of the CR200J multiple unit, adopt the electronically controlled proportional regulating valve, pneumatic clamping device, microcomputer control and other methods to reduce the operation time, save labor costs, program the test steps, ensure the accuracy of the test, ensure the maintenance quality of accessories, and provide protection for the safe operation of passenger cars.

[0006] The technical solution proposed in the utility model is implemented as follows: a CR200J EMU double-window relief indicator test fixture, including an air circuit control main valve, an air pressure regulating unit, a pneumatic clamping unit, a pressure detection unit, an execution unit, a control unit, and a power supply module, wherein the control unit is divided into a manual control unit and an automatic control unit, the air circuit control main valve is composed of a solenoid valve DKF, a pressure regulating valve and an air cylinder, the air inlet of the solenoid valve DKF is connected to the air cylinder, and the air outlet is divided into five routes, which are respectively connected to the air inlets of two proportional valves in the air pressure regulating unit and three two-position five-way solenoid valves in the pneumatic clamping unit, and the coil is connected to the switching power supply output end of the power supply module. The air pressure regulation unit consists of a proportional valve BLF1 for adjusting the parking window and check valve test air pressure of the double-window relief indicator, and a proportional valve BLF2 for adjusting the brake window and brake relief display test air pressure of the double-window relief indicator. The air inlets of BLF1 and BLF2 are connected to the air outlet of the main solenoid valve DKF of the entire air circuit, the air outlet of BLF1 is connected to the air inlet of the solenoid valves DKFJ11 and DKFJ31, and the air outlet of BLF2 is connected to the air inlet of the solenoid valves DKFJ21 and DKFJ41. The proportional valves BLF1 and BLF2 each have four circuit connection ports, one of which is connected to the positive terminal of the working voltage output of the power module, and the other is connected to the negative (0V) terminal of the power module. The third port is divided into two paths, one is connected to the sliding end of the potentiometer W2 through the other normally open contact of the relay JK5 in the manual control unit circuit, and the other is connected to the automatic control board in the automatic control unit circuit through the other normally closed contact of JK5. The pneumatic clamping unit consists of a brake release indicator clamping unit, a check valve clamping unit and a double-window relief indicator clamping unit. Each of the three clamping units is composed of a cylinder, a cylinder mounting seat and a clamping block. The two inlet and outlet holes of each of the three cylinders are respectively connected to the two air outlets of three two-position five-way solenoid valves (YJF1, YJF2, YJF3). The clamping block air outlet of the brake release indicator clamping unit is connected to the air inlet of the solenoid valve DKFJ42, one clamping block air outlet of the check valve clamping unit is connected to the air inlet of DKFJ32, and the other clamping block air outlet is connected to the air inlet of DKFP3. One clamping block air outlet of the double-window relief indicator clamping block is connected to the air inlet of the solenoid valve DKFJ12, and the other clamping block air outlet is connected to the air inlet of the solenoid valve DKFJ22.The pressure detection unit consists of a pressure sensor and a pressure display module. The pressure display module includes a pressure display gauge in the manual control unit and a button display module in the automatic control unit. The power supply line of the pressure display gauge YLB is connected to the 24V linear power supply of the power module through the manual position of the knob switch SK8. There are multiple pressure sensor signal paths and air paths. The air hole of each pressure sensor YLC is connected to the air inlet of an electromagnetic valve DKF through an air distributor. Its signal input port IN is connected to the output positive pole of the power module. The signal output port OUT is divided into two paths. One path is connected to the port IN of the pressure gauge in the manual control unit through a normally open contact of the switch JK1, and the other path is connected to the signal input port of the automatic control board in the automatic control unit through a normally closed contact of the switch JK1. The execution unit consists of a multi-channel, two-position, two-way solenoid valve and a multi-channel, two-position, five-way solenoid valve. The air inlet of each two-position, five-way solenoid valve is connected to the air outlet of the solenoid valve DKF in the air circuit control main valve, and the two air outlets are respectively connected to the two air inlets and outlets of the cylinder in the pneumatic clamping unit. The negative end of the two coils of the five-way solenoid valve is connected to the negative (0V) of the power module, and the positive end is respectively connected to the two normally open contacts of the knob switch SK1. The middle contact of SK1 is connected to the switching power output of the power module; the air circuit formed by each two-position, two-way solenoid valve is composed of two two-way solenoid valves installed in series, one positive and one reverse. The air inlet of one of them is connected to the air outlet of the proportional valve of the air pressure regulation unit, and the air outlet is connected to the air outlet of the other two-way solenoid valve. The coils of the two two-way solenoid valves are connected in parallel, the positive end is connected to the switching power output of the power module, and the negative end is divided into two paths, one is connected to a normally open contact of a knob switch, and the other is connected to the optocoupler isolation drive module in the automatic control unit.The control unit consists of a manual control unit and an automatic control unit. The manual control unit includes potentiometers W1 and W2, knob switches SK4, SK5, SK6 and SK7. The potentiometer W1 for controlling the pressure adjustment of the proportional valve BLF1 is connected to the proportional valve BLF1, the potentiometer W2 for controlling the pressure adjustment of the proportional valve BLF2 is connected to the proportional valve BLF2, the knob switch SK4 for controlling the charging, pressure maintaining and exhausting of the brake release indicator, the knob switch SK5 for controlling the charging, pressure maintaining and exhausting of the check valve, the knob switch SK6 for controlling the charging, pressure maintaining and exhausting of the brake window of the double-window relief indicator, and the knob switch SK7 for controlling the charging, pressure maintaining and exhausting of the parking window of the double-window relief indicator. Pushbutton switch SK7 is connected to the solenoid valves in their respective paths. The automatic control unit includes an automatic control board, an optocoupler isolation driver module, and a key display module. Pins 1 and 2 of the automatic control board's power supply are connected to a 5V linear power supply module via an SK8 automatic position contact. Pin 3 is connected to the negative terminal of relay JK4's coil. Pins 4-7 are connected to the pressure sensor output signal. Pins 8-12 are connected to pins 5-1 of the TM1638 in that order. Pins 13-20 are connected to pins 1-8 of the optocoupler isolation driver module in that order. Pin 21 is connected to the IN terminal of proportional valve BLF1 via a normally closed contact of relay JK5, and pin 22 is connected to the IN terminal of proportional valve BLF2 via another normally closed contact of relay JK5. Pins 9 and 10 of the optocoupler isolation driver module are connected to a 24V linear power supply module via an SK8 automatic position contact. Pins 11-18 are connected to the negative terminals of the coils of solenoid valves DKFJ and DKFP. The power supply module includes a DC24V switching power supply module, a DC5V linear power supply and a DC24V linear power supply module. The input end of the switching power supply module is connected to the AC220V power input end through fuse FU1, contactor JK and circuit breaker K, and the output end outputs DC24V power after passing through fuse FU2; the input ends of the DC5V linear power supply module and the DC24V linear power supply module are respectively connected to the AC220V power input end through a diode, a transformer, and then through fuse FU1, contactor JK and circuit breaker K. The output ends output DC5V and D24V power respectively after passing through fuses FU4 and FU3. The negative (0V) of the three power modules are connected together.

[0007] The utility model provides a CR200J EMU double-window relief indicator test fixture that adopts an electrically controlled proportional valve to achieve precise and rapid adjustment of the air pressure; pneumatic clamping is adopted between the test workpiece and the test device to reduce operation time; the test steps are programmed by a microcomputer to simplify the operation and reduce the influence of human factors on the test results; the air pressure is adjusted accurately, quickly and stably; the test workpiece is connected to the test device quickly and conveniently, the operation time is short, the operation is simple, and the test is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 : CR200J EMU double-window relief indicator test fixture structure diagram;

[0009] Figure 2 : Schematic diagram of the gas circuit of the test tooling;

[0010] Figure 3 : Wiring diagram of proportional valve of pressure regulating unit;

[0011] Figure 4 : Structural diagram of each clamping unit of the pneumatic clamping unit;

[0012] Figure 5 : Electrical schematic diagram of the manual control unit;

[0013] Figure 6 : Electrical schematic diagram of the automatic control unit;

[0014] Figure 7 : Circuit diagram of the power module;

[0015] In the figure: DKF, DKFJ, DKFP: solenoid valves; YJF1, YJF2, YJF3: two-position five-way solenoid valves; BLF1, BLF2: proportional valves; YLC: pressure sensor; YLB: pressure display gauge; JK1, JK2, JK3, JK4, JK5: relays; SK: rotary switch; W1, W2: potentiometers; K: circuit breaker; FU: fuse. DETAILED DESCRIPTION

[0016] The following is combined with Figure 1 、 2 , 3, 4, 5, 6, 7 and embodiments further illustrate the technical solutions and advantages of the present utility model.

[0017] The utility model provides a CR200J EMU double-window relief indicator test tool for the CR200J EMU, which comprises an air circuit control main valve, an air pressure regulating unit, a pneumatic clamping unit, a pressure detection unit, an execution unit, a control unit, and a power module.

[0018] Gas circuit principle Figure 2 As shown, the air source enters the air cylinder after passing through the mechanical pressure regulating valve. After the air cylinder stabilizes the air pressure, it is divided into five routes after passing through the DKF solenoid valve. Three of them are respectively supplied to the three cylinders of the clamping unit after passing through the two-position five-way solenoid valve. The other two routes go to the proportional valve. One route is divided into two routes through the proportional valve BLF1, and supplies air to the parking indicator window and the check valve of the double-window indicator respectively; the other route is divided into two routes through the proportional valve BLF2, and supplies air to the brake indicator window and the brake release indicator of the double-window indicator respectively.

[0019] In the air circuit diagram, the DKF solenoid valve is the main valve of the entire air circuit, and its function is to shut off or connect the air of the entire air circuit; the three two-position five-way solenoid valves (YJF1, YJF2, and YJF3) are used to control the actions of the three cylinders, which are responsible for clamping and releasing the clamping unit; the two proportional valves (BLF1 and BLF2) realize the adjustment of the test air pressure; the two-position two-way solenoid valve DKFJ is used to control the air filling and pressure maintenance of the workpiece under test, and the DKFP solenoid valve is used to control the exhaust of the workpiece under test; the pressure sensor YLC is used to monitor the test air pressure of the workpiece under test.

[0020] The pressure regulating unit consists of proportional valves BLF1 and BLF2. BLF1 adjusts the test air pressure for the parking window and check valve of the dual-window relief indicator, while BLF2 adjusts the test air pressure for the brake window and brake relief display of the dual-window relief indicator. The pressure regulating unit controls air pressure based on the magnitude of an input electrical signal, offering convenient, rapid, and precise adjustment. The proportional valve model is IVT1050-211, with a maximum output pressure of 1000 kPa. It is powered by 24V DC and has a 0-5V input control signal. The wiring diagram of the proportional valve is shown in Figure 3. The brown wire 1 of proportional valve BLF1 is connected to the +24V supply voltage of the switching power supply module. The white wire 2 is split into two paths: one path connects to the wiper terminal of potentiometer W1 through a normally open contact of relay JK5, and the other path connects to pin 21 of the automatic control board through a normally closed contact of JK5. The blue wire 3 connects to the negative terminal (0V) of the power supply, while the black wire 4 is left unconnected. Proportional valve BLF2's brown wire 1 and blue wire 3 have the same connections as BLF1. White wire 2 is split into two paths: one path connects to the wiper of potentiometer W2 via the other normally open contact of relay JK5, and the other path connects to pin 22 of the automatic control board via the other normally closed contact of JK5. Black wire 4 is left unconnected. The air inlets of proportional valves BLF1 and BLF2 are connected to the air outlets of solenoid valve DKF. The air outlet of BLF1 is connected to the air inlets of solenoid valves DKFJ11 and DKFJ31, while the air outlet of BLF2 is connected to the air inlets of solenoid valves DKFJ21 and DKFJ41.

[0021] Figure 4 shows the clamping structures of the pneumatic clamping units. From left to right, they are the brake release indicator clamping unit, the check valve clamping unit, and the double-window release indicator clamping unit. As can be seen in the figure, the clamping units consist of three parts: a cylinder, a cylinder mounting base, and a clamping block. The pneumatic clamping unit secures the test workpiece to the test fixture, using the clamping force to seal the test workpiece and the test fixture's air ports. The cylinder model for the brake release indicator clamping unit and the check valve clamping unit is TCQ50-50, while the cylinder model for the double-window release indicator clamping unit is MGPM50×50Z. The cylinder generates the clamping force and is bolted to the cylinder mounting base. Its two inlet and outlet ports connect to the two outlet ports of the two-position, five-way solenoid valve. The cylinder mounting base is composed of an aluminum alloy bracket and a stainless steel plate, which are bolted together and mounted on the test bench housing. It provides a mounting support for the cylinder. The clamping block positions the test workpiece and connects to the air ports.

[0022] The pressure detection unit consists of a pressure sensor and a pressure display module. Its function is to detect the test pressure of the test workpiece and display the test results. During manual testing, the pressure display module is a pressure display meter, and during automatic testing, the pressure display module is a TM1638 key display module.

[0023] The power supply line of the pressure display gauge YLB is connected to the 24V linear power supply through the manual position of the knob switch SK8. Since the automatic control board has only 4 pressure signal inputs, the pressure signals of YLC4 and YLC5 are switched through relay JK4 in automatic mode.

[0024] The air hole of the pressure sensor YLC1 is connected to the air inlet of DKFJ12 through the air distributor. Its input IN is connected to the positive terminal of the linear power supply module LM317-24V. The signal output OUT is divided into two paths. One path is connected to the IN of the pressure gauge YLB1 through a normally open contact of JK1, and the other path is connected to the 4th pin of the automatic control board through a normally closed contact of JK1.

[0025] The air hole of the pressure sensor YLC2 is connected to the air inlet of DKFJ22 through the air distributor. Its input IN is connected to the positive terminal of the linear power supply module LM317-24V. The signal output OUT is divided into two paths. One path is connected to the IN of the pressure gauge YLB2 through another normally open contact of JK1, and the other path is connected to the 5th pin of the automatic control board through another normally closed contact of JK1.

[0026] The air hole of the pressure sensor YLC3 is connected to the air inlet of DKFJ32 through the air distributor. Its input IN is connected to the positive terminal of the linear power supply module LM317-24V. The signal output OUT is divided into two paths. One path is connected to the IN of the pressure gauge YLB3 through a normally open contact of JK2, and the other path is connected to the 6th pin of the automatic control board through a normally closed contact of JK2.

[0027] The air hole of pressure sensor YLC4 is connected to the air inlet of DKFP3 through the air distributor. Its input IN is connected to the positive terminal of linear power supply module LM317-24V. The signal output OUT is divided into two paths. One path is connected to the IN of pressure gauge YLB4 through the other normally open contact of JK2, and the other path is connected to pin 7 of automatic control board through the other normally closed contact of JK2 and the normally closed contact of JK4.

[0028] The air hole of pressure sensor YLC5 is connected to the air inlet of DKFJ42 through the air distributor. Its input IN is connected to the positive terminal of linear power supply module LM317-24V. The signal output OUT is divided into two paths. One path is connected to the IN of pressure gauge YLB5 through a normally open contact of JK3, and the other path is connected to pin 7 of the automatic control board through a normally closed contact of JK3 and the normally open contact of JK4.

[0029] The actuator unit consists of a two-position, two-way solenoid valve and a two-position, five-way solenoid valve. The five-way solenoid valve has two coils. The two-position solenoid valve controls the filling, pressure maintenance, and exhaust of the test workpiece, while the five-position solenoid valve controls the clamping and release of the pneumatic clamping unit.

[0030] The function of the solenoid valve DKF is to shut off or open the air in the entire air circuit. The air inlet is connected to the air cylinder, and the air outlet is divided into five paths, which are respectively connected to the air inlets of two proportional valves and three two-position five-way solenoid valves. The coil is connected to the output of the switching power supply module.

[0031] The air inlet of the two-position, five-way solenoid valve YJF1 is connected to the air outlet of the solenoid valve DKF, and the two air outlets are connected to the air inlet and outlet of the double-window relief indicator cylinder. The negative terminals of the two coils are connected to the negative power supply (0V), and the positive terminals are connected to the two normally open contacts of the rotary switch SK1. The center contact of SK1 is connected to the +24V supply of the switching power module. The connection relationship between YJF2 and YJF3 is similar to that of YJF1.

[0032] Since the two-position two-way solenoid valve can only cut off the air in one direction, backflow will occur when maintaining pressure after charging, making it impossible to maintain pressure. Therefore, two solenoid valves are used in the air circuit, one installed in the forward direction and the other in the reverse direction to solve the problem of maintaining pressure.

[0033] The air inlet of solenoid valve DKFJ11 is connected to the air outlet of BLF1, and the air outlet is connected to the air outlet of DKFJ12. The air inlet of DKFJ12 is connected to the air distributor. The coils of DKFJ11 and DKFJ12 are connected in parallel, with the positive terminal connected to the +24V supply of the switching power supply module. The negative terminal is split into two paths: one connected to a normally open contact of the rotary switch SK4, and the other connected to pin 18 of the optocoupler isolation driver module. The air inlet of solenoid valve DKFP1 is connected to the air distributor, and the air outlet is directly connected to the atmosphere. The positive terminal of the coil is connected to the +24V supply of the switching power supply module, and the negative terminal is connected to the other normally open contact of the rotary switch SK4. The center contact of SK4 is connected to the negative power supply. The connection relationship of the remaining two-position, two-way solenoid valves is similar.

[0034] The control unit consists of a manual control unit and an automatic control unit. Automatic control is mainly used when in use, and manual control is used when the automatic control unit is unavailable.

[0035] The manual control unit consists of potentiometers W1 and W2, knob switches SK4, SK5, SK6 and SK7, and the connection relationship is as follows: Figure 5 As shown. Rotary switch SK4 controls the charge, pressure maintenance, and exhaust of the brake release indicator. SK5 controls the charge, pressure maintenance, and exhaust of the check valve. SK6 controls the charge, pressure maintenance, and exhaust of the brake window of the dual-window release indicator. SK7 controls the charge, pressure maintenance, and exhaust of the parking window of the dual-window release indicator. Potentiometer W1 controls proportional valve BLF1 for pressure regulation, and potentiometer W2 controls proportional valve BLF2 for pressure regulation.

[0036] The automatic control unit consists of an automatic control board, an optocoupler isolation drive module, and a TM1638 key display module. The connection relationship is as follows: Figure 6 As shown in the figure, pins 1 and 2 of the automatic control board's power supply are connected to a 5V linear power supply module via an SK8 automatic position contact. Pin 3 is connected to the negative terminal of the coil of relay JK4. Pins 4-7 are connected to the pressure sensor output signal. Pins 8-12 are connected sequentially to pins 5-1 of the TM1638. Pins 13-20 are connected sequentially to pins 1-8 of the optocoupler isolation driver module. Pin 21 is connected to the IN terminal of proportional valve BLF1 via a normally closed contact of relay JK5. Pin 22 is connected to the IN terminal of proportional valve BLF2 via another normally closed contact of relay JK5. Pins 9 and 10 of the optocoupler isolation driver module are connected to a 24V linear power supply module via an SK8 automatic position contact. Pins 11-18 are connected to the negative terminals of the coils of solenoid valves DKFJ and DKFP.

[0037] Power module circuit such as Figure 7The 220V AC power supply is divided into three paths after passing through circuit breaker K, contactor JK, and fuse FU1. One path outputs 24V DC power through the SP-240-24 switching power supply module and fuse FU2; one path outputs 24V DC power through a transformer, diode, LM317, and fuse FU3; and the final path outputs 5V DC power through a transformer, diode, LM317, and fuse FU4. The negative terminals (0V) of all three power modules are connected together. The 24V DC switching power supply module provides operating power for the solenoid valve and proportional valve; the 5V DC linear power supply powers the proportional valve control and automatic control board; and the 24V DC linear power supply powers the pressure sensor, relay, and pressure display.

Claims

1. A CR200J EMU double-window relief indicator test tool, characterized by: It includes an air circuit control main valve, an air pressure regulating unit, a pneumatic clamping unit, a pressure detection unit, an execution unit, a control unit, and a power supply module. The control unit is divided into a manual control unit and an automatic control unit. The air circuit control main valve is composed of a solenoid valve DKF, a pressure regulating valve, and an air cylinder. The air inlet of the solenoid valve DKF is connected to the air cylinder, and the air outlet is divided into five routes, which are respectively connected to the air inlets of the two proportional valves in the air pressure regulating unit and the three two-position five-way solenoid valves in the pneumatic clamping unit. The coil is connected to the switching power supply output end of the power supply module.

2. The CR200J EMU double-window relief indicator test tool according to claim 1 is characterized in that: The air pressure regulation unit consists of a proportional valve BLF1 for adjusting the parking window and check valve test air pressure of the double-window relief indicator, and a proportional valve BLF2 for adjusting the brake window and brake relief display test air pressure of the double-window relief indicator. The air inlets of BLF1 and BLF2 are connected to the air outlet of the main solenoid valve DKF of the entire air circuit, the air outlet of BLF1 is connected to the air inlet of the solenoid valves DKFJ11 and DKFJ31, and the air outlet of BLF2 is connected to the air inlet of the solenoid valves DKFJ21 and DKFJ41. The proportional valves BLF1 and BLF2 each have four circuit connection ports, one of which is connected to the positive terminal of the working voltage output of the power module, and the other is connected to the negative (0V) terminal of the power module. The third port is divided into two paths, one is connected to the sliding end of the potentiometer W2 through the other normally open contact of the relay JK5 in the manual control unit circuit, and the other is connected to the automatic control board in the automatic control unit circuit through the other normally closed contact of JK5.

3. The CR200J EMU double-window relief indicator test tool according to claim 1 is characterized in that: The pneumatic clamping unit consists of a brake release indicator clamping unit, a check valve clamping unit and a double-window relief indicator clamping unit. Each of the three clamping units is composed of a cylinder, a cylinder mounting seat and a clamping block. The two inlet and outlet holes of each of the three cylinders are respectively connected to the two air outlets of three two-position five-way solenoid valves (YJF1, YJF2, YJF3). The clamping block air outlet of the brake release indicator clamping unit is connected to the air inlet of the solenoid valve DKFJ42, one clamping block air outlet of the check valve clamping unit is connected to the air inlet of DKFJ32, and the other clamping block air outlet is connected to the air inlet of DKFP3. One clamping block air outlet of the double-window relief indicator clamping block is connected to the air inlet of the solenoid valve DKFJ12, and the other clamping block air outlet is connected to the air inlet of the solenoid valve DKFJ22.

4. The CR200J EMU double-window relief indicator test tool according to claim 1 is characterized in that: The pressure detection unit consists of a pressure sensor and a pressure display module. The pressure display module includes a pressure display gauge in the manual control unit and a button display module in the automatic control unit. The power supply line of the pressure display gauge YLB is connected to the 24V linear power supply of the power module through the manual position of the knob switch SK8. There are multiple pressure sensor signal paths and air paths. The air hole of each pressure sensor YLC is connected to the air inlet of an electromagnetic valve DKF through an air distributor. Its signal input port IN is connected to the output positive pole of the power module. The signal output port OUT is divided into two paths. One path is connected to the port IN of the pressure gauge in the manual control unit through a normally open contact of the switch JK1, and the other path is connected to the signal input port of the automatic control board in the automatic control unit through a normally closed contact of the switch JK1.

5. The CR200J EMU double-window relief indicator test tool according to claim 1 is characterized in that: The execution unit consists of a multi-channel, two-position, two-way solenoid valve and a multi-channel, two-position, five-way solenoid valve. The air inlet of each two-position, five-way solenoid valve is connected to the air outlet of the solenoid valve DKF in the air circuit control main valve, and the two air outlets are respectively connected to the two air inlets and outlets of the cylinder in the pneumatic clamping unit. The negative end of the two coils of the five-way solenoid valve is connected to the negative (0V) of the power module, and the positive end is respectively connected to the two normally open contacts of the knob switch SK1. The middle contact of SK1 is connected to the switching power output of the power module; the air circuit formed by each two-position, two-way solenoid valve is composed of two two-way solenoid valves installed in series, one positive and one reverse. The air inlet of one of them is connected to the air outlet of the proportional valve of the air pressure regulation unit, and the air outlet is connected to the air outlet of the other two-way solenoid valve. The coils of the two two-way solenoid valves are connected in parallel, the positive end is connected to the switching power output of the power module, and the negative end is divided into two paths, one is connected to a normally open contact of a knob switch, and the other is connected to the optocoupler isolation drive module in the automatic control unit.

6. The CR200J EMU double-window relief indicator test tool according to claim 1 is characterized in that: The control unit consists of a manual control unit and an automatic control unit. The manual control unit includes potentiometers W1 and W2, knob switches SK4, SK5, SK6 and SK7. The potentiometer W1 for controlling the pressure adjustment of the proportional valve BLF1 is connected to the proportional valve BLF1, the potentiometer W2 for controlling the pressure adjustment of the proportional valve BLF2 is connected to the proportional valve BLF2, the knob switch SK4 for controlling the air charging, pressure maintaining and exhaust of the brake relief indicator, the knob switch SK5 for controlling the air charging, pressure maintaining and exhaust of the check valve, the knob switch SK6 for controlling the air charging, pressure maintaining and exhaust of the brake window of the double-window relief indicator, and the knob switch SK7 for controlling the air charging, pressure maintaining and exhaust of the parking window of the double-window relief indicator are respectively connected to the solenoid valves of their respective passages; the automatic control unit includes an automatic control The control board, optocoupler isolation drive module, key display module, power supply pins 1 and 2 of the automatic control board are connected to the 5V linear power supply module through the SK8 automatic position contact, pin 3 is connected to the negative coil of relay JK4, pins 4-7 are connected to the pressure sensor output signal, pins 8-12 are connected to pins 5-1 of TM1638 in sequence, pins 13-20 are connected to pins 1-8 of the optocoupler isolation drive module in sequence, pin 21 is connected to the IN of the proportional valve BLF1 through a normally closed contact of relay JK5, and pin 22 is connected to the IN of the proportional valve BLF2 through another normally closed contact of relay JK5. The power supply pins 9 and 10 of the optocoupler isolation drive module are connected to the 24V linear power supply module through the SK8 automatic position contact, and pins 11-18 are connected to the negative coils of the solenoid valves DKFJ and DKFP.

7. The CR200J EMU double-window relief indicator test tool according to claim 1 is characterized in that: The power supply module includes a DC24V switching power supply module, a DC5V linear power supply and a DC24V linear power supply module. The input end of the switching power supply module is connected to the AC220V power input end through fuse FU1, contactor JK and circuit breaker K, and the output end outputs DC24V power after passing through fuse FU2; the input ends of the DC5V linear power supply module and the DC24V linear power supply module are respectively connected to the AC220V power input end through a diode, a transformer, and then through fuse FU1, contactor JK and circuit breaker K. The output ends output DC5V and D24V power respectively after passing through fuses FU4 and FU3. The negative (0V) of the three power modules are connected together.

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