Withstand voltage insulation test equipment

Abstract

The utility model discloses voltage-withstanding insulation test equipment, which is used for detecting the voltage-withstanding insulation performance of a connector and comprises a test carrier, a controller, a tester and a driving device, and the tester and the driving device are electrically connected with the controller. The test carrier comprises a movable carrier provided with a butt joint and a fixed carrier used for installing the connector, the driving device is used for driving the movable carrier to move towards the fixed carrier so that the butt joint can be connected with the connector in an inserted mode, and the tester is electrically connected with the butt joint; when the tester detects that the withstand voltage insulation performance of the connector does not meet the preset standard, the controller controls the driving device to stop working, and at the moment, a user can manually take down the connector. According to the utility model, test data can be timely and accurately recorded and stored, and the machine is stopped when defective products are detected, so that the risk that the defective products flow to the next process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of withstand voltage insulation detection, in particular to a withstand voltage insulation testing device. Background Art

[0002] Connectors are electromechanical components that connect electrical circuits. In addition to meeting general performance requirements, connectors must also ensure good contact, reliable operation, and easy maintenance. Their reliability directly affects the normal operation of aircraft circuits and the safety of the entire aircraft. A withstand voltage insulation tester is a device used to test connectors. It can perform insulation strength tests on various high-voltage electrical equipment, electrical components, and insulating materials under power frequency or DC high voltage.

[0003] However, current testing equipment typically uses a manual or semi-automatic split-type pneumatic die set to operate connectors. A toggle clamp or cylinder pushes the module to position the connector, and then manually activates the insulation withstand voltage tester for testing. The insulation withstand voltage tester then displays the test results, and defective products are manually removed and placed in a designated defective box. Good products are collected in a transfer box and passed to the next process. Because the pneumatic die set and insulation withstand voltage tester are separate, there's no way to collect and display test data. This makes it difficult to accurately record and store test results and production quantities in a timely manner. Furthermore, there's a risk of defective products being passed to the next process, increasing the risk of subsequent defects and manufacturing costs. Utility Model Content

[0004] In response to the deficiencies of the prior art, the present invention provides a withstand voltage insulation testing device that can record and store test data in a timely and accurate manner. At the same time, it shuts down the machine when defective products are detected, greatly reducing the risk of defective products being transferred to the next process.

[0005] The utility model is achieved through the following technical solutions:

[0006] A withstand voltage insulation test device for detecting the withstand voltage insulation performance of a connector, the withstand voltage insulation test device comprising a test carrier, a controller, a tester electrically connected to the controller, and a drive device; the test carrier comprising a movable carrier mounted with a docking head and a fixed carrier for mounting the connector; the drive device for driving the movable carrier toward the fixed carrier so that the docking head and the connector are plugged into each other; the tester being electrically connected to the docking head;

[0007] When the tester detects that the withstand voltage insulation performance of the connector does not meet a predetermined standard, the controller controls the driving device to stop working, and the user can manually remove the connector.

[0008] Furthermore, the voltage-withstand insulation testing equipment also includes a working platform and a movable module and a fixed module arranged on the working platform. The fixed module is fixedly connected to the working platform. A slide rail is also provided on the working platform. The driving device can drive the movable module to move along the direction of the slide rail toward the direction of the fixed module. The movable carrier is detachably connected to the movable module, and the fixed carrier is detachably connected to the fixed module.

[0009] Furthermore, the withstand voltage insulation test equipment also includes a pressure sensor electrically connected to the controller, one end of the pressure sensor is fixedly connected to the output end of the driving device, and the other end is fixedly connected to the dynamic module.

[0010] Furthermore, the withstand voltage insulation test equipment also includes a human-machine interface, which is electrically connected to the controller and can display the test data stored in the controller in real time.

[0011] Furthermore, the withstand voltage insulation test equipment also includes an alarm device electrically connected to the controller. When the tester detects that the withstand voltage insulation performance of the connector does not meet a predetermined standard, the controller sends an alarm signal to the alarm device in real time.

[0012] Furthermore, the withstand voltage insulation test equipment also includes a safety grating electrically connected to the controller. When the safety grating is blocked during operation, a signal is sent to the controller, and the controller immediately controls the driving device to stop working and lock the device, and sends an alarm signal to the alarm device in real time to sound an alarm.

[0013] Furthermore, the voltage-withstand insulation testing equipment also includes a card reader electrically connected to the controller. After the controller controls the driving device to stop working and locks the device, the user can use an IC card to unlock the device at the card reader or enter a password through the human-machine interface to unlock the device.

[0014] Furthermore, the voltage-withstand insulation testing equipment also includes an emergency stop button electrically connected to the controller. When the user presses the emergency stop button due to an emergency, the controller controls the driving device to stop working and lock the device, and sends an alarm signal to the alarm device in real time to sound an alarm.

[0015] Furthermore, the withstand voltage insulation test equipment also includes a quick-plug interface, and the tester is connected to the docking head via the quick-plug interface.

[0016] Furthermore, the withstand voltage insulation test equipment also includes a control circuit, the tester is connected to the quick-plug interface through the control circuit, a number of high-voltage relays are arranged in the control circuit, and the controller can control different high-voltage relays to close to control the automatic switching of different test circuits.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. By integrating the tester, test carrier and drive device into one device, desktop operation is achieved, reducing labor requirements.

[0019] 2. By setting a servo motor as the driving device and providing an S-shaped pressure sensor at the output end of the driving device, the real-time pressure of the position process during the detection can be monitored to ensure that the connector will not be damaged when the butt joint and the connector are connected.

[0020] 3. By setting up alarm devices and safety gratings, when the detection results are poor, or the safety grating is blocked during equipment operation, the red indicator light flashes and an audible and visual alarm sounds. At the same time, the controller controls the equipment to lock the machine. At this time, you need to use an IC card or human-machine password to unlock it, so that the mobile module returns to its initial position, greatly reducing the risk of defective products being transferred to the next process.

[0021] 4. By setting up the control loop and using multiple high-voltage relays, the controller calls the appropriate program to control the on and off of the high-voltage relay to switch different loops, realize parameter solidification and quantification, facilitate adjustment of settings, and switch the parameters required for different test requirements with one click. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a withstand voltage insulation test device according to an embodiment of the present invention;

[0023] Figure 2 This is a partial exploded schematic diagram of a withstand voltage insulation test device according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of another part of the explosion of the withstand voltage insulation test equipment according to one embodiment of the present invention;

[0025] Figure 4 This is a partial structural diagram of a withstand voltage insulation test device according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic structural diagram of a test carrier for a withstand voltage insulation test device according to an embodiment of the present invention;

[0027] Figure 6 This is a circuit principle block diagram of a withstand voltage insulation test device according to an embodiment of the present invention;

[0028] Figure 7 This is a control circuit diagram of a withstand voltage insulation test device according to an embodiment of the present invention.

[0029] Description of the drawings: 1. Housing; 2. Controller; 3. Tester; 4. Drive device; 5. Test carrier; 6. Human-machine interface; 7. Pressure sensor; 8. Control circuit; 100. First mounting plate; 101. Second mounting plate; 102. First zone; 103. Second zone; 104. Third zone; 30. Display window; 40. Fixing member; 14. Test bench; 50. Fixed module; 51. Moving module; 15. Slide rail; 500. Fixed carrier; 510. Moving carrier; 70. Coupling; 13. Quick-connect connector; 130. Quick-connect connector 21. Cooling fan; 9. Alarm device; 10. Card reader; 90. Pass indicator light; 91. Alarm indicator light; 11. Safety light barrier; 12. Emergency stop button; 110. Light barrier protection plate; 17. Foot support; 18. Circuit installation plate; 19. Dual-control start button; 190. Protective sheet; 20. Handle; 22. Electric door; 23. Hinge; 24. Lock; 111. Light barrier fixing strip; 80. High-voltage relay; 150. Guide rod; 501. First mounting slot; 502. Second mounting slot; 140. Working platform. DETAILED DESCRIPTION

[0030] The following is a further non-restrictive detailed description of the technical solution of the utility model in conjunction with the preferred embodiments and the accompanying drawings. In the description of the utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model.

[0031] like Figures 1 to 5As shown, a withstand voltage insulation test device according to an embodiment of the present invention is used to test the withstand voltage insulation performance of a connector. The withstand voltage insulation test device includes a housing 1, a test carrier 5, a controller 2 disposed within the housing 1, a tester 3 electrically connected to the controller 2, and a drive device 4. The test carrier 5 includes a movable carrier 510 mounted with a docking connector and a fixed carrier 500 for mounting the connector. The drive device 4 is used to drive the movable carrier 510 toward the fixed carrier 500 to mate the docking connector with the connector. The tester 3 is electrically connected to the docking connector.

[0032] When the tester 3 detects that the withstand voltage insulation performance of the connector does not meet the predetermined standard, the controller 2 controls the driving device 4 to stop working. At this time, the user can manually remove the connector. The controller 2 can store the test data of the tester 3.

[0033] The voltage withstand insulation testing equipment also includes a working platform 140 and a movable module 51 and a fixed module 50 arranged on the working platform 140. The fixed module 50 is fixedly connected to the working platform 140. A slide rail 15 is also provided on the working platform 140. The driving device 4 can drive the movable module 51 to move along the direction of the slide rail 15 toward the fixed module 50. The movable carrier 510 is detachably connected to the movable module 51, and the fixed carrier 500 is detachably connected to the fixed module 50.

[0034] Specifically, refer to Figure 2 、 Figure 3 The housing 1 includes a first mounting plate 100 and a second mounting plate 101. The first mounting plate 100 and the second mounting plate 101 are arranged horizontally in the housing 1 and divide the space in the housing 1 into a first area 102, a second area 103 and a third area 104. The tester 3 is arranged in the first area 102 and fixed to the first mounting plate 100 by screws (not shown in the figure). The housing 1 is also provided with a display window 30 for displaying the panel of the tester 3. A transparent panel is also fixed on the display window 30 for dust prevention. The controller 2 is arranged in the second area 103 and fixed to the second mounting plate 101 by screws. The drive device 4 is arranged in the third area 104 and fixed to the housing 1 by screws. In addition, a fixing part 40 is also provided on the housing 1. The fixing part 40 is composed of a series of fixing plates for stabilizing the drive device 4. The drive device 4 is fixedly connected to the fixing part 40 by screws, and the output end of the drive device 4 passes through the fixing part 40. The provision of the fixing part 40 makes the operation of the drive device 4 more stable and ensures the accuracy of docking. In this embodiment, the controller 2 is a PLC, the driving device 4 is a servo motor, and the tester 3 is a withstand voltage insulation tester.

[0035] Reference Figure 4The housing 1 is attached to the work platform 140 via screws. A test bench 14 is also fixed to the work platform 140, and the test vehicle 5 is mounted on the test bench 14. Specifically, the test bench 14 is connected to the work platform 140 via screws, and a slide rail 15 is also fixed to the test bench 14. The fixed module 50 is fixed to the test bench 14 via screws, and the movable module 51 is slidably disposed on the test bench 14 via the slide rail 15. Two guide rods 150 are also fixed to the fixed module 50. The two guide rods 150 are slidably disposed within the movable module 51, ensuring greater stability during the movement of the movable module 51 toward the fixed module 50.

[0036] Reference Figure 5 In this embodiment, the fixed carrier 500 is provided with four first mounting slots 501, which can simultaneously install four connectors. The dynamic carrier 510 is provided with four corresponding second mounting slots 502, which can simultaneously install four docking connectors. The dynamic carrier 510 is internally provided with circuits, and the second mounting slots 502 are provided with contacts corresponding to the docking connectors. The four docking connectors are connected to the internal circuits through the contacts. During testing, the connector is installed on the fixed carrier 500, the corresponding docking connector is selected and installed on the dynamic carrier 510, the fixed carrier 500 is installed on the fixed module 50, and the dynamic carrier 510 is installed on the dynamic module 51. When the driving device 4 drives the dynamic module 51 toward the fixed module 50, the docking connector can dock with the corresponding connector.

[0037] In addition, the withstand voltage insulation test equipment also includes a pressure sensor 7 electrically connected to the controller 2. The pressure sensor 7 can send pressure data to the controller 2. One end of the pressure sensor 7 is fixedly connected to the output end of the drive device 4 and the other end is fixedly connected to the moving module 51. The drive device 4 drives the moving module 51 to move in the direction of the fixed module 50. When the docking head is docked with the corresponding connector, the pressure sensor 7 can detect the pressure data between the output end of the drive device 4 and the moving module 51 in real time and send the pressure data to the controller 2. When the docking head and the connector are plugged in normally, the pressure value is within the preset value. When the docking head and the connector are plugged in incorrectly, the pressure value is significantly higher than the preset value. At this time, the controller 2 controls the drive device 4 to stop and send an alarm signal, realizing real-time monitoring and feedback of the force value during the plugging process, forming a closed-loop control, and ensuring the plugging forward position distance. In this embodiment, the pressure sensor 7 is an S-shaped pressure sensor, which can more conveniently and accurately detect the pressure during docking. The withstand voltage insulation test equipment also includes a coupling 70, one end of which is fixed to the output end of the drive device 4 and the other end is fixed to the pressure sensor 7.

[0038] Reference Figure 6 、 Figure 7The withstand voltage insulation tester also includes a control circuit 8 and a quick-connect connector 13 disposed on the housing 1. The control circuit 8 is disposed within the second zone 103. The tester 3 is connected to the quick-connect connector 13 via the control circuit 8. The quick-connect connector 13 is then connected to the dynamic carrier 510, thereby connecting the tester 3 to the docking head. Several high-voltage relays 80 are disposed within the control circuit 8, and the controller 2 can control the closure of different high-voltage relays 80 to automatically switch between different test circuits. For ease of understanding, the following will further elaborate on a test embodiment in which the control loop 8 specifically controls the four quick sockets 130. Specifically, in this embodiment, six high-voltage relays 80 and four quick sockets 130 are provided. For ease of understanding, the six high-voltage relays 80 are numbered KA1, KA2, KA3, KA4, KA5, and KA6, and the four quick sockets are numbered A, B, C, and D. When testing A and B, KA1 and KA6 are energized; when testing AB and CD, KA1, KA2, KA4, and KA5 are energized; when measuring AC and BD, KA1, KA3, KA4, and KA6 are energized.

[0039] In this embodiment, the quick-connect interface 13 includes four quick-connect sockets 130 and is a 485 communication interface, enabling testing of connectors with four or fewer sockets. Furthermore, a cooling fan 21 is installed on the housing 1 corresponding to the second zone 103 for heat dissipation. In this embodiment, the control circuit 8 utilizes high-voltage wires, allowing it to withstand currents of approximately 10 kV.

[0040] The withstand voltage insulation tester also includes a human-machine interface 6, which is electrically connected to the controller 2 and displays test data stored in the controller 2 in real time. Specifically, during testing, the user can use the human-machine interface 6 to select the appropriate test recipe based on the different connectors, that is, the different circuits in the control circuit 8. In this embodiment, the human-machine interface 6 is a touch interface and is fixedly connected to the housing 1 for convenient user operation.

[0041] The withstand voltage insulation test equipment also includes an alarm device 9 and a card reader 10 electrically connected to the controller 2. When the tester 3 detects that the withstand voltage insulation performance of the connector does not meet the predetermined standard and sends the data synchronously to the controller 2, the controller 2 sends an alarm signal to the alarm device 9 in real time to sound an alarm. At the same time, when the tester 3 detects a defective product, the controller 2 controls the drive device 4 to stop working and lock the device. The user can use an IC card to unlock the device at the card reader 10 or enter a password to unlock the device through the human-machine interface 6. Specifically, the housing 1 is provided with an indicator light 90, an alarm indicator light 91 and a card reader 10. The card reader 10 is set to the right of the human-machine interface 6 for user operation. The indicator light 90 and the alarm indicator light 91 are set in the center of the device to prompt the operator. The alarm device 9 includes an alarm indicator light 91 and an alarm horn. When the alarm device 9 receives the alarm signal, it synchronously emits sound and light prompts, which greatly reduces the risk of defective products entering the next process. It is worth noting that when the device is in a locked state, the user cannot restart or reset the drive device 4 through the human-machine interface 6 or the dual-control start button 19, that is, the device cannot continue to detect; when the device is in an unlocked state, the user can reset the drive device 4 at the human-machine interface 6, so that the device can continue to detect.

[0042] The housing 1 is also equipped with an emergency stop button 12 and a safety grating 11 electrically connected to the controller 2. In particular, the safety grating 11 electrically connected to the controller 2 is installed on both sides of the test bench 14. The safety grating 11 is fixed to the housing 1 by a grating fixing bar 111. During the operation of the equipment, when the safety grating 11 is blocked, a signal is sent to the controller 2, and the controller 2 immediately controls the drive device 4 to stop working and lock the equipment, and sends an alarm signal to the alarm device 9 in real time to sound an alarm. A grating protection plate 110 is also installed on the outside of the housing 1 by screws to reduce the risk of accidentally triggering the grating. The emergency stop button 12 is installed at the top of the equipment for the user's convenience in emergency use. After the user presses the emergency stop button 12 due to an emergency, the controller 2 immediately controls the drive device 4 to stop working and lock the equipment, and sends an alarm signal to the alarm device 9 in real time to sound an alarm.

[0043] In addition, a foot support 17 and a circuit mounting plate 18 for fixing the wiring are installed below the housing 1. Specifically, the circuit mounting plate 18 is fixed to the bottom of the housing 1 with screws, and a certain amount of space is left for wiring. A dual-control start button 19 is also installed on the housing 1. The two buttons of the dual-control start button 19 are fixed to the two corners of the device and are set on the grating protection plate 110. The two buttons of the dual-control start button 19 need to be activated together, reducing the risk of accidental activation. A protective plate 190 is installed on the dual-control start button 19 to protect the dual-control start button 19. The foot supports 17 are installed at the four corners of the device to elevate the device for easy wiring. In addition, handles 20 are installed on both sides of the housing 1 for easy carrying. Finally, the housing 1 also includes an electric control door 22, which is rotatably fixed to the housing 1 via hinges 23 and physically locked to the housing 1 via a lock 24. When maintenance is required, the user can use a key to open the electric control door 22 to repair the equipment.

[0044] To use the device, the user first turns on the power switch and connects the tester 3, or the insulation withstand voltage tester, by connecting the contacts in the second mounting slot 502 on the moving carrier 510 to the quick-connect connector 13 using a cable. The user then selects the corresponding recipe (i.e., a different test circuit) on the human-machine interface 6 and performs a spot check to test whether the device is functioning properly. The device then enters operational mode. The user then installs the four connectors in the first mounting slot 501 of the fixed carrier 500 and selects the corresponding docking connector, which is installed in the second mounting slot 502 of the moving carrier 510 and electrically contacts the corresponding contacts, connecting the insulation withstand voltage tester to the docking connector. Then install the fixed carrier 500 on the fixed module 50, and install the dynamic carrier 510 on the dynamic module 51, start the dual-control start button 19, and the controller 2 controls the drive device 4 to drive the dynamic module 51 to move toward the fixed module 50, so that the docking head is docked with the corresponding connector. At this time, the tester 3 can perform the test. When the connector meets the standard, the green pass indicator light 90 lights up and the next round of testing is carried out; when the connector does not meet the inspection standard, the controller 2 controls the drive device 4 to stop running and lock the device. At the same time, the alarm indicator light 91 lights up and the alarm horn sounds to remind the user. The user uses the IC card to enter the password at the card reader 10 or at the human-machine interface 6 to unlock the device and remove the unqualified connector. During the test, the docking pressure, test records and alarm records are all stored in the controller 2 and can be called up and displayed at the human-machine interface 6. At the same time, the device includes an open interface, such as an Ethernet interface, so that the data can be stored and traced and uploaded to the MES system.

[0045] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A withstand voltage insulation test device for detecting the withstand voltage insulation performance of a connector, characterized in that: The withstand voltage insulation test equipment comprises a test carrier (5), a controller (2), a tester (3) electrically connected to the controller (2), and a drive device (4); the test carrier (5) comprises a movable carrier (510) equipped with a docking joint and a fixed carrier (500) for installing the connector; the drive device (4) is used to drive the movable carrier (510) to move toward the fixed carrier (500) so that the docking joint is plugged into the connector; and the tester (3) is electrically connected to the docking joint; When the tester (3) detects that the withstand voltage insulation performance of the connector does not meet a predetermined standard, the controller (2) controls the driving device (4) to stop working, and the user can manually remove the connector.

2. The withstand voltage insulation test equipment according to claim 1, characterized in that: The withstand voltage insulation test equipment further comprises a working platform (140) and a movable module (51) and a fixed module (50) arranged on the working platform (140); the fixed module (50) is fixedly connected to the working platform (140); a slide rail (15) is further provided on the working platform (140); the driving device (4) can drive the movable module (51) to move along the slide rail (15) toward the fixed module (50); the movable carrier (510) is detachably connected to the movable module (51); and the fixed carrier (500) is detachably connected to the fixed module (50).

3. The withstand voltage insulation test equipment according to claim 2, characterized in that: The withstand voltage insulation test equipment further comprises a pressure sensor (7) electrically connected to the controller (2), one end of the pressure sensor (7) being fixedly connected to the output end of the drive device (4) and the other end being fixedly connected to the dynamic module (51).

4. The withstand voltage insulation test equipment according to claim 1, characterized in that: The withstand voltage insulation test equipment further comprises a human-machine interface (6), wherein the human-machine interface (6) is electrically connected to the controller (2), and the human-machine interface (6) can display the test data stored in the controller (2) in real time.

5. The withstand voltage insulation test equipment according to claim 4, characterized in that: The withstand voltage insulation test equipment further comprises an alarm device (9) electrically connected to the controller (2); when the tester (3) detects that the withstand voltage insulation performance of the connector does not meet a predetermined standard, the controller (2) sends an alarm signal to the alarm device (9) in real time.

6. The withstand voltage insulation test equipment according to claim 5, characterized in that: The withstand voltage insulation test equipment further comprises a safety grating (11) electrically connected to the controller (2). When the safety grating (11) is blocked during operation of the equipment, a signal is sent to the controller (2). The controller (2) immediately controls the driving device (4) to stop working and lock the equipment, and sends an alarm signal to the alarm device (9) in real time to sound an alarm.

7. The withstand voltage insulation test equipment according to claim 6, characterized in that: The withstand voltage insulation test equipment further comprises a card reader (10) electrically connected to the controller (2). After the controller (2) controls the driving device (4) to stop working and locks the device, a user can unlock the device at the card reader (10) using an IC card or unlock the device by entering a password through the human-machine interface (6).

8. The withstand voltage insulation test equipment according to claim 5, characterized in that: The withstand voltage insulation test equipment further comprises an emergency stop button (12) electrically connected to the controller (2). When a user presses the emergency stop button (12) in an emergency, the controller (2) controls the driving device (4) to stop working and lock the device, and sends an alarm signal to the alarm device (9) in real time to sound an alarm.

9. The withstand voltage insulation test equipment according to claim 1, characterized in that: The withstand voltage insulation test equipment further comprises a quick-plug interface (13), and the tester (3) is connected to the docking head via the quick-plug interface (13).

10. The withstand voltage insulation test equipment according to claim 9, characterized in that: The withstand voltage insulation test equipment further includes a control circuit (8), the tester (3) is connected to the quick-plug interface (13) via the control circuit (8), a plurality of high-voltage relays (80) are provided in the control circuit (8), and the controller (2) can control different high-voltage relays (80) to close to control the automatic switching of different test circuits.

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