Automatic test tool for electrified railway contact network switch monitoring device

Abstract

The invention discloses an automatic test tool for an electrified railway contact network switch monitoring device, which belongs to the technical field of test tools and comprises an MCU (Microprogrammed Control Unit), a system auxiliary circuit, a power supply conversion circuit, a YX test power supply switching circuit, a communication interface circuit connected with a monitoring device to be tested, a voice module, a remote signaling control output circuit and a remote control detection input circuit. The monitoring device of the electrified railway contact network switch centralized monitoring system is automatically tested in the production process, the debugging time can be shortened, the debugging quality can be improved, the capability requirement of debugging personnel can be reduced, and the purpose of reducing the production cost can be finally achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of testing tools, and in particular relates to an automatic testing tool for an electrified railway overhead contact network switch monitoring device. Background Art

[0002] The contact network disconnector in the centralized monitoring system of the contact network switch of the electrified railway is an important part of the electric traction power supply system, which is mainly responsible for changing the power supply operation mode, segmented operation and fault isolation. With the rapid development of electrified railways, the demand for remote monitoring and control is increasing. Each monitoring system screen needs to be installed with 8 to 12 monitoring devices. The production, debugging and inspection of these monitoring devices often have the following problems or deficiencies:

[0003] 1) During production debugging, each device needs to test 16-channel telesignals, 10-channel remote controls, power failure checks, and system information checks, including device type, software version, EEPROM memory status, watchdog status, clock calibration status, etc. There are many inspection items, and the signal test uses a manual test harness with low loading efficiency, resulting in a long debugging time (a single unit debugging takes no less than 30 minutes), and production often cannot be completed on time.

[0004] 2) Due to the large number of test items and the high mobility of debugging personnel, test items are easily missed.

[0005] 3) During the power-off function test, the remote signal voltage needs to be adjusted dynamically. There are deviations in the test remote signal voltages adjusted by different debugging personnel, resulting in inaccurate debugging results. Summary of the invention

[0006] The purpose of the present invention is to provide an automatic testing tool for an electrified railway contact network switch monitoring device in view of the above-mentioned deficiencies in the prior art, so as to solve the problems that the existing monitoring device uses a manual test harness with low efficiency and that many test items are prone to missed tests.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] An automatic test tool for an electrified railway overhead line switch monitoring device, comprising an MCU, a system auxiliary circuit, a power conversion circuit, a YX test power switching circuit, a communication interface circuit connected to a monitoring device to be tested, a voice module, a remote signal control output circuit and a remote control detection input circuit;

[0009] The input end of the power conversion circuit is connected to the AC220V AC power supply, and the output end of the power conversion circuit is connected to the YX test power switching circuit and the MCU respectively; the MCU is connected to the YX test power switching circuit, the system auxiliary circuit, the communication interface circuit, the voice module, the remote signal control output circuit and the remote control detection input circuit respectively.

[0010] Furthermore, the MCU is a chip GD32F103VGT6; the remote control detection input circuit includes 10 optocouplers TLP181 and a signal socket J3; pins 26, 27, 28, 55, 56, 57, 58, 59, 61, and 62 of the chip GD32F103VGT6 are respectively connected to pin 1 of the 10 optocouplers TLP181; the 10 optocouplers are respectively connected to the wiring terminals YK1, YK2, YK3, YK4, YK5, YK6, YK7, YK8, YK9, and YK10 of the monitoring device to be tested through the signal socket J3.

[0011] Furthermore, the remote control output circuit includes 8 relays AQW214 and a signal socket J2; pins 8 and 9, pins 10 and 11, pins 24 and 25, pins 37 and 38, pins 39 and 40, pins 51 and 52, pins 53 and pin 2, and pins 3 and 4 of the chip GD32F103VGT6 are respectively connected to pins 2 and 4 of the 8 relays AQW214; the 8 relays AQW214 are connected to the connection terminals YX1, YX2, YX3, YX4, YX5, YX6, YX7, YX8, YX9, YX10, YX11, YX12, YX13, YX14, YX15, and YX16 of the monitoring device to be tested through the signal socket J2.

[0012] Furthermore, the power conversion circuit includes a 24V AC-DC power module, a 3.3V AC-DC power module, a 15VAC-DC power module, a 13V AC-DC power module, and a 12V AC-DC power module; the 24V AC-DC power module is respectively connected to the 3.3V AC-DC power module, the 15V AC-DC power module, the 13V AC-DC power module, and the 12V AC-DC power module.

[0013] Furthermore, the output ends of the 24V AC-DC power module, the 5V AC-DC power module, the 13V AC-DC power module and the 12V AC-DC power module are respectively connected to the YX test power switching circuit; the output end of the 3.3V AC-DC power module is connected to the MCU.

[0014] Furthermore, the YX test power switching circuit includes a multiplexer SN74LVC138; pin 14, pin 13, pin 12, and pin 11 of the multiplexer SN74LVC138 are respectively connected to the output ends of the 24V AC-DC power module, the 5V AC-DC power module, the 13V AC-DC power module, and the 12V AC-DC power module; pin 1, pin 2, and pin 3 of the multiplexer SN74LVC138 are respectively connected to pin 34, pin 35, and pin 36 of the chip GD32F103VGT6.

[0015] Further, the communication interface circuit includes a U6 chip SN74AHC1G04DBV, a U7 chip SN74AHC1G125 and an M1 chip RSM232;

[0016] Pin 4 and pin 3 of the M1 chip RSM232 are respectively connected to pin 43 and pin 42 of the chip GD32F103VGT6, pin 6 and pin 7 of the M1 chip RSM232 are respectively connected to pin 1 and pin 2 of the J4 chip KF2510-3, and pin 1 and pin 2 of the J4 chip KF2510-3 are respectively connected to the RXD pin and TXD pin in the JP2 interface of the monitoring device to be tested;

[0017] Pin 4 of the U6 chip SN74AHC1G04DBV is connected to pin 17 of the chip GD32F103VGT6, pin 2 of the U7 chip SN74AHC1G125 is connected to pin 16 of the chip GD32F103VGT6, pin 4 of the U7 chip SN74AHC1G125 is connected to pin 8 of the optical fiber interface LD1 OCB4141, and the optical fiber interface LD1 OCB4141 is connected to the optical communication interface of the monitoring device to be tested.

[0018] Furthermore, the voice module is connected to pin 29 and pin 30 of chip GD32F103VGT6.

[0019] The automatic testing tool for the monitoring device of the overhead contact network switch of the electrified railway provided by the present invention has the following beneficial effects:

[0020] 1. The present invention automatically tests the monitoring device of the centralized monitoring system of the overhead contact network switch of the electrified railway during the production process, which can shorten the debugging time, improve the debugging quality, reduce the ability requirements of the debugging personnel, and ultimately achieve the purpose of reducing production costs.

[0021] 2. The present invention uses a test tool to debug the monitoring device. The test time for a single device is about 1 minute. Compared with manual debugging using a wiring harness, which takes 30 minutes per device, the production cycle can be greatly shortened and the production cost can be reduced.

[0022] 3. The testing tool of the present invention automatically completes the test of the monitoring device according to the program setting items, and there is no missed detection.

[0023] 4. The present invention uses a tool to debug the monitoring device. The debugger only needs to perform simple operations, such as connecting the power supply and the test line, starting the test, stopping the test, recording the test results through voice prompts, etc. The required test auxiliary signals are all generated by the test tool and applied automatically, which can significantly reduce the technical level requirements of the debugger and improve the debugging quality of the monitoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a circuit principle block diagram of the automatic testing tooling of the electrified railway overhead contact network switch monitoring device.

[0025] Figure 2 This is the first remote control detection input circuit of the present invention.

[0026] Figure 3 This is the second remote control detection input circuit of the present invention.

[0027] Figure 4 This is the remote signal control output circuit 1 of the present invention.

[0028] Figure 5 This is the remote signal control output circuit 2 of the present invention.

[0029] Figure 6 This is the remote signal control output circuit three of the present invention.

[0030] Figure 7 This is the circuit diagram of the signal sockets J2 and J3 of the present invention.

[0031] Figure 8 This is a power conversion circuit 1 of the present invention.

[0032] Fig. 9 This is the second power conversion circuit of the present invention.

[0033] Fig.10 This is the power conversion circuit three of the present invention.

[0034] Fig.11 This is the YX test power switching circuit of the present invention.

[0035] Fig.12 This is the second power switching circuit of the YX test of the present invention.

[0036] Fig.13 This is the third power switching circuit of the YX test of the present invention.

[0037] Fig.14 This is the communication interface circuit of the present invention.

[0038] Fig.15 MCU and system auxiliary circuit of the present invention Figure 1 .

[0039] Fig.16 MCU and system auxiliary circuit of the present invention Figure 2 .

[0040] Fig.17 This is the circuit diagram of the monitoring device to be tested. DETAILED DESCRIPTION

[0041] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0042] Example 1

[0043] The automatic testing tool of the electric railway contact network switch monitoring device of the present embodiment can automatically test the monitoring device, shorten the debugging time, reduce the production cost, and avoid missed detection. Figure 1 and Fig.17 , which specifically include:

[0044] Test start button and test stop button, MCU, system auxiliary circuit, power conversion circuit, YX test power switching circuit, communication interface circuit connected to the monitoring device to be tested, voice module, remote control output circuit and remote control detection input circuit;

[0045] Among them, the input end of the power conversion circuit is connected to the AC220V AC power supply, and the output end of the power conversion circuit is connected to the YX test power switching circuit and the MCU respectively; the MCU is respectively connected to the YX test power switching circuit, the system auxiliary circuit, the communication interface circuit, the voice module, the remote control output circuit and the remote control detection input circuit.

[0046] As a preferred embodiment of the present invention, the MCU of the present invention adopts the chip GD32F103VGT6;

[0047] The test start button and the test stop button of this embodiment serve as start and stop switches, and are respectively connected to pin 14 and pin 15 of the chip GD32F103VGT6.

[0048] Remote control detection input circuit;

[0049] refer to Figure 2 , Figure 3 and Figure 7The remote control detection input circuit of this embodiment is used for inputting remote control signals when remote control testing, and specifically includes 10 optical couplers TLP181 and a signal socket J3; pins 26, 27, 28, 55, 56, 57, 58, 59, 61, and 62 of the chip GD32F103VGT6 are respectively connected to pin 1 of the 10 optical couplers TLP181; the 10 optical couplers are respectively connected to the wiring terminals YK1, YK2, YK3, YK4, YK5, YK6, YK7, YK8, YK9, and YK10 of the monitoring device to be tested through the signal socket J3.

[0050] Remote signal control output circuit;

[0051] refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 The remote control output circuit is used to output remote control signals, which specifically includes 8 relays AQW214 and a signal socket J2; pins 8 and 9, pins 10 and 11, pins 24 and 25, pins 37 and 38, pins 39 and 40, pins 51 and 52, pins 53 and 2, and pins 3 and 4 of the chip GD32F103VGT6 are respectively connected to pins 2 and 4 of the 8 relays AQW214; the 8 relays AQW214 are connected to the wiring terminals YX1, YX2, YX3, YX4, YX5, YX6, YX7, YX8, YX9, YX10, YX11, YX12, YX13, YX14, YX15, and YX16 of the monitoring device to be tested through the signal socket J2.

[0052] Power conversion circuit;

[0053] refer to Figure 8 , Fig. 9 and Fig.10 The power conversion circuit is used to provide converted power, which includes a 24VAC-DC power module, a 3.3V AC-DC power module, a 15V AC-DC power module, a 13V AC-DC power module, and a 12V AC-DC power module; the 24V AC-DC power module is respectively connected to the 3.3V AC-DC power module, the 15V AC-DC power module, the 13V AC-DC power module, and the 12V AC-DC power module.

[0054] The output ends of the 24V AC-DC power module, the 5V AC-DC power module, the 13V AC-DC power module and the 12VAC-DC power module are respectively connected to the YX test power switching circuit; the output end of the 3.3VAC-DC power module is connected to the MCU.

[0055] During specific operations, the AC220V AC power input is converted into a DC24V DC power supply through a 24V AC-DC power module. The DC24 power supply is converted into +3.3V, +15V, +13V, and +12V DC power supplies through four AC-DC power modules, of which +3.3V is used to test the working voltage inside the tooling board, and other power supplies are used for remote signal test functions.

[0056] YX tests the power switching circuit;

[0057] refer to Fig.11 , Fig.12 and Fig.13 , the YX test power switching circuit includes a decoder, a photocoupler, and a relay. Under the control of the MCU output pin signal, +24V, +15V, +13V, and +12V are selected as the remote signal test power supply;

[0058] Among them, it also includes a multiplexer SN74LVC138, pin 14, pin 13, pin 12, and pin 11 of the multiplexer SN74LVC138 are respectively connected to the output ends of the 24V AC-DC power module, the 5V AC-DC power module, the 13V AC-DC power module, and the 12VAC-DC power module; pin 1, pin 2, and pin 3 of the multiplexer SN74LVC138 are respectively connected to pin 34, pin 35, and pin 36 of the chip GD32F103VGT6.

[0059] Communication interface circuit;

[0060] refer to Fig.14 The communication interface circuit is used to realize the communication connection between the automatic test fixture and the monitoring device to be tested, which specifically includes a U6 chip SN74AHC1G04DBV, a U7 chip SN74AHC1G125 and an M1 chip RSM232;

[0061] Pin 4 and pin 3 of the M1 chip RSM232 are connected to pin 43 and pin 42 of the chip GD32F103VGT6 respectively, pin 6 and pin 7 of the M1 chip RSM232 are connected to pin 1 and pin 2 of the J4 chip KF2510-3 respectively, and pin 1 and pin 2 of the J4 chip KF2510-3 are connected to the RXD pin and TXD pin in the JP2 interface of the monitoring device to be tested respectively;

[0062] Pin 4 of U6 chip SN74AHC1G04DBV is connected to pin 17 of chip GD32F103VGT6, pin 2 of U7 chip SN74AHC1G125 is connected to pin 16 of chip GD32F103VGT6, pin 4 of U7 chip SN74AHC1G125 is connected to pin 8 of optical fiber interface LD1 OCB4141, and optical fiber interface LD1 OCB4141 is connected to the optical communication interface of the monitoring device to be tested.

[0063] The voice module is connected to pin 29 and pin 30 of the chip GD32F103VGT6. As a mature technology in this field, the voice module can be preferably a YS-V6 voice module, so its specific composition is not repeated here.

[0064] The system auxiliary circuit of this embodiment is as follows Fig.15 and Fig.16 As shown, it is used to provide reset and working status monitoring signals and JTAG debugging interface for MCU. It is a conventional technology in this field, so its specific composition will not be described in detail.

[0065] The system information detection of the monitoring device to be tested in this embodiment specifically includes the following contents:

[0066] (1) The automatic test fixture MCU sends a "STOP" signal through the TXD0 serial port (pin P42 of the MCU) to stop feeding the watchdog. The onboard watchdog of the monitoring device under test times out and outputs a reset signal to restart the monitoring device under test. When the device is powered on, it uploads a power-on message to the RXD0 serial port pin (pin P43 of the MCU) of the automatic test fixture board MCU.

[0067] (2) The automatic test tool recognizes the uploaded startup message and sends commands through TXD2 and RXD2 (P29 and P30 pins of the MCU) to control the voice module to output voice broadcasts: board type and software version number for the tester to check and record.

[0068] (3) The automatic test tooling MCU sends an "INFO" command through the TXD0 serial port, and identifies in the returned information: parameter EEPROM, event EEPROM status, and controls the voice module to play the check status through the MCU; identifies the hexadecimal address information, and controls the voice module to play the address information through the MCU.

[0069] (4) The automatic test tool MCU sends "INFO" twice through the TXD0 serial port, with an interval of 2 seconds between commands, and compares the two times. The MCU then controls the voice module to play the inspection results to determine whether the clock of the monitoring device under test is working normally.

[0070] The remote signal test of the monitoring device to be tested specifically includes the following contents:

[0071] (1) The test tool MCU outputs control signals through pins P34, P35, and P36, selects the remote signal power supply as 24V, and then outputs control signals through pin P8, adding the 24V test signal to the YX1 terminal of the monitoring device to be tested. At the same time, the MCU is connected to the optical communication interface of the monitoring device to be tested through the TXD1 and RXD1 serial ports (pins P16 and P17 of the MCU), and checks whether the applied analog remote signal is normal by sending a remote signal full call command, thereby judging whether the YX1 channel of the monitoring device to be tested is normal. If the check is abnormal, the MCU controls the voice module to play the abnormal status and stops subsequent tests; if there is no abnormality, the MCU repeats the above process until the remote signal test of channels YX2 to YX16 is completed.

[0072] (2) On the basis of the above, the analog remote control signal applied to the YX2~YX16 channels is maintained. At the same time, the MCU controls the YX test power switching circuit, changes the remote power supply to 12V, and detects whether all remote signals are invalid at this time, so as to determine whether the threshold voltage of each remote signal channel is normal.

[0073] (3) After all tests are completed, if there are no abnormalities, the MCU controls the voice module to play the remote signal check to check the normal results.

[0074] The remote control test of the monitoring device to be tested specifically includes the following contents:

[0075] (1) The automatic test tool MCU outputs control signals through pins P8 and P37 respectively, driving the 24V remote signal power supply to be applied to the YX1 (closing position) and YX7 (remote operation) remote signal terminals. The test tool MCU sends the remote control opening command of the isolating switch through the TXD1 and RXD1 serial ports to control the operation of the isolating switch opening relay of the monitoring device under test. The MCU detects the return status of the YK1 and YK3 contacts through pins P26 and P28. If the remote control action returns incorrectly, the MCU controls the voice module to play the test abnormality and terminates subsequent tests.

[0076] (2) The MCU of the automatic test tool outputs control signals through the P8 and P37 pins, applies 24V remote signal power to the YX2 (opening position) and YX7 (remote operation) remote signal terminals, and controls the opening relay of the isolating switch of the monitoring device under test. The MCU detects the return status of the YK2 and YK4 contacts through pins P27 and P55. If the remote control action returns incorrectly, the MCU controls the voice module to play the test abnormality and terminates subsequent tests.

[0077] (3) The MCU of the automatic test tooling sends the remote control opening / closing command to the test object through the TXD1 and RXD1 serial ports to control the operation of the test relay. The MCU sends the remote signal full-action command and checks the YX17 (test switch) signal change through the communication message. If the operation is abnormal, the MCU controls the voice module to play the test abnormality and terminates subsequent tests.

[0078] (4) The automatic test tool MCU outputs the control signal through pin P10, applies 24V remote signal power to the YX3 (operating power supply position) remote signal terminal to give +24V, and the test tool MCU sends the electric switch closing command through the TXD1 and RXD1 serial ports to control the operation of the electric switch closing relay of the monitoring device under test. The MCU detects the return status of the YK5 contact action through pin P56. If the remote control action return is incorrect, the MCU controls the voice module to play the test abnormality and terminates subsequent tests.

[0079] (5) The automatic test tool MCU outputs a control signal through pin P11, applies a 24V remote signal power supply to the YX4 (operating power is in the closed position) remote signal terminal to give +24V. The test tool MCU sends an electric switch opening command through the TXD1 and RXD1 serial ports to control the operation of the electric switch opening relay of the monitoring device under test. The MCU detects the return status of the YK6 contact action through pin P57. If the remote control action return is incorrect, the MCU plays the test abnormality through the control voice module and terminates subsequent tests.

[0080] (6) The MCU of the automatic test tool sends a heater trip command through the TXD1 and RXD1 serial ports to control the heater trip relay of the monitoring device under test. The MCU detects the return status of the YK7 contact action through pin P58. If the remote control action return is incorrect, the MCU controls the voice module to play the test abnormality and terminates subsequent tests.

[0081] (7) The MCU of the automatic test tool sends a heater trip command through the TXD1 and RXD1 serial ports to control the heater trip relay of the monitoring device under test. The MCU detects the return status of the YK8 contact action through pin P59. If the remote control action return is incorrect, the MCU controls the voice module to play the test abnormality and terminates subsequent tests.

[0082] (8) The automatic test tooling MCU sends the YK9 action command through the TXD1 and RXD1 serial ports to control the YK9 relay of the monitoring device to be tested. The MCU detects the return status of the YK9 contact action through the P61 pin. If the remote control action return is incorrect, the MCU controls the voice module to play the test abnormality and terminates subsequent tests.

[0083] (9) The MCU of the automatic test tool sends the YK10 action command through the TXD1 and RXD1 serial ports to control the action of the YK10 relay of the monitoring device under test. The MCU detects the return status of the YK10 contact action through the P62 pin. If the remote control action return is incorrect, the MCU controls the voice module to play the test abnormality and terminates subsequent tests.

[0084] The power failure test of the monitoring device to be tested specifically includes the following contents:

[0085] 1) Under the condition that the AC power is not lost (MCU pin P33 = 0), the test tool MCU outputs control signals through pins P34, P35, and P36, selects the remote signal power supply as 24V, and outputs control signals through P8, P9, P10, P11, P24, P25, P37, P38, P39, P40, P51, P52, P53, P2, P3, and P4 to drive the 24V remote signal power supply to all remote signal terminals of the monitoring device to be tested. The MCU sends the remote signal full move command through the TXD1 and RXD1 serial ports to collect all remote signals and confirm that all remote signals (YX1-YX16) are in the on state;

[0086] 2) The test tool MCU outputs a control signal through pin P31, first cuts off the AC220V output that powers the device, and the MCU sends a remote signal full-move command through the TXD1 and RXD1 serial ports to detect whether YX18 (AC power) is disconnected;

[0087] 3) Keep the current power-off state, test the tooling MCU to output control signals through pins P34, P35, and P36, select the remote signal power supply as 15V, and the MCU sends the remote signal full-move command through the TXD1 and RXD1 serial ports, detect that YX19 (battery has power) is disconnected, and YX1-YX16 remote signals are in the connected state;

[0088] 4) Keep the current power-off state, the test tooling MCU outputs control signals through pins P34, P35, and P36, selects the remote signal power supply as DC12V, and the MCU sends the remote signal full-move command through the TXD1 and RXD1 serial ports to collect remote signals and confirm that all remote signals (YX1-YX16) are in the on state (the device loses power and the remote signal stops updating);

[0089] 5) Restore AC power supply and end the power failure test. If all processes meet the above description, the MCU controls the voice module to play the power failure function test normally.

[0090] Although the specific implementation of the invention is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. An automatic test tool for an electrified railway overhead line switch monitoring device, characterized in that: It includes MCU, system auxiliary circuit, power conversion circuit, YX test power switching circuit, communication interface circuit connected to the monitoring device to be tested, voice module, remote signal control output circuit and remote control detection input circuit; The input end of the power conversion circuit is connected to the AC220V AC power supply, and the output end of the power conversion circuit is connected to the YX test power switching circuit and the MCU respectively; the MCU is connected to the YX test power switching circuit, the system auxiliary circuit, the communication interface circuit, the voice module, the remote signal control output circuit and the remote control detection input circuit respectively.

2. The automatic testing tool for the overhead contact network switch monitoring device of the electrified railway according to claim 1 is characterized by: The MCU is a chip GD32F103VGT6; the remote control detection input circuit includes 10 optocouplers TLP181 and a signal socket J3; pins 26, 27, 28, 55, 56, 57, 58, 59, 61, and 62 of the chip GD32F103VGT6 are respectively connected to pin 1 of the 10 optocouplers TLP181; the 10 optocouplers are respectively connected to the connection terminals YK1, YK2, YK3, YK4, YK5, YK6, YK7, YK8, YK9, and YK10 of the monitoring device to be tested through the signal socket J3.

3. The automatic testing tool for the overhead contact network switch monitoring device of the electrified railway according to claim 2 is characterized by: The remote control output circuit includes 8 relays AQW214 and a signal socket J2; pins 8 and 9, pins 10 and 11, pins 24 and 25, pins 37 and 38, pins 39 and 40, pins 51 and 52, pins 53 and pin 2, and pins 3 and 4 of the chip GD32F103VGT6 are respectively connected to pins 2 and 4 of the 8 relays AQW214; the 8 relays AQW214 are connected to the connection terminals YX1, YX2, YX3, YX4, YX5, YX6, YX7, YX8, YX9, YX10, YX11, YX12, YX13, YX14, YX15, and YX16 of the monitoring device to be tested through the signal socket J2.

4. The automatic testing tool for the overhead contact network switch monitoring device of the electrified railway according to claim 2 is characterized by: The power conversion circuit includes a 24V AC-DC power module, a 3.3V AC-DC power module, a 15V AC-DC power module, a 13V AC-DC power module, and a 12V AC-DC power module; the 24V AC-DC power module is connected to the 3.3V AC-DC power module, the 15V AC-DC power module, the 13V AC-DC power module, and the 12V AC-DC power module respectively.

5. The automatic testing tool for the overhead contact network switch monitoring device of the electrified railway according to claim 4 is characterized in that: The output ends of the 24V AC-DC power module, the 5V AC-DC power module, the 13V AC-DC power module and the 12V AC-DC power module are respectively connected to the YX test power switching circuit; the output end of the 3.3V AC-DC power module is connected to the MCU.

6. The automatic testing tool for the overhead contact network switch monitoring device of the electrified railway according to claim 5 is characterized by: The YX test power switching circuit includes a multiplexer SN74LVC138; pin 14, pin 13, pin 12, and pin 11 of the multiplexer SN74LVC138 are respectively connected to the output ends of a 24VAC-DC power module, a 5V AC-DC power module, a 13V AC-DC power module, and a 12V AC-DC power module; pin 1, pin 2, and pin 3 of the multiplexer SN74LVC138 are respectively connected to pin 34, pin 35, and pin 36 of a chip GD32F103VGT6.

7. The automatic testing tool for the overhead contact network switch monitoring device of the electrified railway according to claim 2 is characterized by: The communication interface circuit includes a U6 chip SN74AHC1G04DBV, a U7 chip SN74AHC1G125 and an M1 chip RSM232; Pin 4 and pin 3 of the M1 chip RSM232 are respectively connected to pin 43 and pin 42 of the chip GD32F103VGT6, pin 6 and pin 7 of the M1 chip RSM232 are respectively connected to pin 1 and pin 2 of the J4 chip KF2510-3, and pin 1 and pin 2 of the J4 chip KF2510-3 are respectively connected to the RXD pin and TXD pin in the JP2 interface of the monitoring device to be tested; Pin 4 of the U6 chip SN74AHC1G04DBV is connected to pin 17 of the chip GD32F103VGT6, pin 2 of the U7 chip SN74AHC1G125 is connected to pin 16 of the chip GD32F103VGT6, pin 4 of the U7 chip SN74AHC1G125 is connected to pin 8 of the optical fiber interface LD1 OCB4141, and the optical fiber interface LD1 OCB4141 is connected to the optical communication interface of the monitoring device to be tested.

8. The automatic testing tool for the overhead contact network switch monitoring device of an electrified railway according to claim 2 is characterized by: The voice module is connected to pins 29 and 30 of the chip GD32F103VGT6.

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