Contactor test equipment

Abstract

The invention relates to the technical field of contactor testing, in particular to contactor testing equipment which comprises a testing terminal, a guide group is fixedly mounted at the bottom end of the testing terminal, an alignment device is fixedly mounted at the front end of the top of the guide group, and the alignment device comprises a first rack, a first pressure-sensitive sensor, a two-dimensional code scanner, a supporting base frame and a transmission gear. The two-dimensional code scanner is fixedly installed at the front end of the top of the supporting base frame, the transmission gears are rotationally installed at the front end of the top of the supporting base frame and located at the two ends of the two-dimensional code scanner, and the first pressure-sensitive sensor is fixedly installed at the front end of the top of the supporting base frame and located below the transmission gears. The first rack is slidably inserted into the front end of the top of the supporting base frame and engaged with the transmission gear, and the guiding and conveying set comprises a feeding device, a transmission component and a supporting device. Through the arrangement of the alignment device and the guide group, the function of integrating automatic plugging and synchronous operation of the contactor during testing is realized.

Description

Technical Field

[0001] This invention relates to the field of contactor testing technology, specifically to a contactor testing device. Background Technology

[0002] DC contactors, as an important component of control systems for new energy vehicles and industrial vehicles, are widely used in industrial vehicles, charging piles, new energy battery packs, electronic control systems, energy storage, uninterruptible power supplies, and high-voltage frequency converters, playing a vital role. In new energy battery packs, DC contactors are used in charging circuits, discharging circuits, pre-charging circuits, and heating circuits, providing overcharge protection, over-discharge protection, and other auxiliary functions for the battery. They also serve as key control components for the charging and discharging circuits of the battery pack.

[0003] Currently, because contactors require the plug and socket to be inserted sequentially to turn on the test equipment during testing, a delay occurs during testing. Therefore, existing contactors cannot perform the integrated function of automatic plugging and synchronous operation during testing. Thus, an improved device is needed to address this issue. Summary of the Invention

[0004] To address the problems in the prior art, the present invention provides a contactor testing device.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a contactor testing device, including a testing terminal, a guide group fixedly installed at the bottom end of the testing terminal, and an alignment device fixedly installed at the top front end of the guide group. The alignment device includes a first rack, a first pressure sensor, a QR code scanner, a support frame, and a transmission gear. The QR code scanner is fixedly installed at the top front end of the support frame, and the transmission gear is rotatably installed at the top front end of the support frame, with the transmission gear located at both ends of the QR code scanner. The first pressure sensor is fixedly installed at the top front end of the support frame, and is located below the transmission gear. The first rack is slidably inserted into the top front end of the support frame, and meshes with the transmission gear.

[0006] Specifically, the guide assembly includes a feeding device, a transmission component, and a support device. The feeding device is fixedly installed at the top front end of the support device, and the transmission component is slidably sleeved on the top front end of the support device, with the transmission component located below the feeding device.

[0007] Specifically, the feeding device includes a support chassis, a positioning seat, a second pressure-sensitive sensor, connecting wires, and an alignment socket. The support chassis is fixedly installed at the front end of the positioning seat, the second pressure-sensitive sensor is fixedly installed at the rear of both sides of the positioning seat, the connecting wires are fixedly installed at equal intervals at the rear end of the alignment socket, and the alignment socket is fixedly installed at the top rear end of the positioning seat.

[0008] Specifically, the transmission component includes a displacement device, a contact device, an alignment plug, and a contactor. The contact device is fixedly installed at the front end of the displacement device, the alignment plug is placed inside the top of the displacement device, and the contactor is fixedly installed at the front end of the alignment plug.

[0009] Specifically, the displacement device includes a hexagonal rod, an anti-detachment plate, a positioning frame, a guide rod, a first spring, a support base, a side frame, a second spring, and a positioning sleeve. The first spring and the guide rod are symmetrically fixedly installed at the bottom front end of the support base, with the first spring located on the outer ring of the guide rod. The side frame is fixedly installed at both ends of the support base, and the positioning sleeve is fixedly installed at the top end of the side frame. The hexagonal rod and the second spring are fixedly installed at the front end of the positioning sleeve, with the second spring located on the outer ring of the hexagonal rod. The anti-detachment plate is fixedly installed at the center front end of the hexagonal rod, and the positioning frame is slidably sleeved on the outer ring of the hexagonal rod.

[0010] Specifically, the contact device includes a contact guide rod, a second rack, an L-shaped limiting rod, a support side rod, and a displacement crossbeam. The support side rod is fixedly installed at both ends of the displacement crossbeam, the L-shaped limiting rod is symmetrically fixedly installed at the bottom end of the displacement crossbeam, the contact guide rod is fixedly installed at the top end of the support side rod, and the second rack is fixedly installed at the top front end of the support side rod.

[0011] Specifically, the support device includes a lead screw, a drive motor, a guide rod, and a support base plate. The drive motor is fixedly installed at the bottom front end of the support base plate, the lead screw is fixedly installed at the center rear end of the drive motor, and the guide rods are symmetrically fixedly installed at the front end of the support base plate, with the guide rods located on both sides of the lead screw.

[0012] Specifically, the support base is fixedly installed at the top front end of the support base plate, the displacement crossbar is threaded onto the outer ring of the lead screw, the front end of the first spring is connected to the rear end of the displacement crossbar, and the positioning seat is fixedly installed at the top front end of the support base plate.

[0013] Specifically, a magnetic absorbing plate is fixedly installed at the top front end of the support base, and an iron plate is fixedly installed at the front end of the first rack. The magnetic absorbing plate and the iron plate are vertically aligned. A key is fixedly installed on the front surface of the first rack, and a support block is fixedly installed at the top front end of the support base. A slot is opened inside the support block. The second pressure sensor is horizontally aligned with the contact guide rod. The second rack meshes with the bottom end of the transmission gear. The thickness of the first rack and the second rack is 1 cm, and the thickness of the transmission gear is 3 cm. The first rack and the second rack are staggered. Guide holes are opened inside both ends of the positioning sleeve. A threaded hole is opened in the center of the displacement crossbeam. Insertion holes that match the guide rod and guide rod are symmetrically opened at both ends of the displacement crossbeam. A groove is opened inside the top end of the positioning sleeve. A through hole is opened in the center of the support base. A round hole is opened in the center of the front end of the positioning square frame. The front end of the second spring is connected to the rear end of the positioning square frame. The second pressure sensor is electrically connected to the test terminal.

[0014] The beneficial effects of this invention are:

[0015] First, when the drive motor is turned on, it can drive the lead screw to rotate. When the lead screw rotates, it can drive the displacement crossbeam to move. Thus, the second rack can drive the first rack to move downward through the transmission gear, which can trigger the first pressure-sensitive sensor to turn on the QR code scanner. The QR code scanner can scan the QR code on the contactor to confirm the contactor model. Furthermore, the alignment plug can be slidably inserted into the positioning sleeve to temporarily restrict the alignment plug. Then, when the displacement crossbeam is displaced, it can push the alignment socket and the contactor to move until the alignment plug is inserted into the alignment socket, completing the automatic insertion of the alignment plug and the alignment socket.

[0016] Second, when the displacement crossbeam drives the alignment plug to be inserted into the alignment socket, it can continuously shift, so that the contact guide rod can move to contact the second pressure sensor, enabling the test terminal to be started and the contactor to perform testing. At the same time, when the displacement crossbeam resets, it can drive the second rack to shift in the opposite direction, which can drive the transmission gear to rotate in the opposite direction, and the QR code scanner can be powered off. Furthermore, when the displacement crossbeam continues to shift, when the contact guide rod can disengage from the second pressure sensor, the alignment plug can be pulled out from the alignment socket, and the contactor can stop testing, thus completing the work of synchronizing the operation of the test terminal and the QR code scanner. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a three-dimensional structural diagram of the main body from a frontal perspective in this invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the alignment device from the front view in this invention;

[0020] Figure 3 This is a three-dimensional structural diagram of the guide assembly from the front view in this invention;

[0021] Figure 4 This is a three-dimensional structural diagram of the feeding device from the front view in this invention;

[0022] Figure 5 This is a three-dimensional structural diagram of the transmission component from a frontal perspective in this invention;

[0023] Figure 6 This is a three-dimensional structural diagram of the displacement device from the front view in this invention;

[0024] Figure 7 This is a three-dimensional structural diagram of the contact device from the front view in this invention;

[0025] Figure 8 This is a three-dimensional structural diagram of the support device from the front view in this invention.

[0026] In the diagram: 1-Alignment device, 2-Guide assembly, 3-Test terminal, 4-First rack, 5-First pressure sensor, 6-QR code scanner, 7-Support frame, 8-Transmission gear, 9-Feeding device, 10-Transmission component, 11-Support device, 12-Support chassis, 13-Positioning seat, 14-Second pressure sensor, 15-Connecting wire, 16-Alignment socket, 17-Displacement device, 18-Contact device, 19-Alignment... 20-Contaminant, 21-Hexagonal rod, 22-Anti-detachment plate, 23-Positioning square frame, 24-Guide rod, 25-First spring, 26-Supporting base frame, 27-Side frame, 28-Second spring, 29-Positioning sleeve, 30-Contact guide rod, 31-Second rack, 32-L-shaped limit rod, 33-Supporting side rod, 34-Displacement cross frame, 35-Lead screw, 36-Drive motor, 37-Guide round rod, 38-Supporting base plate. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0028] The invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1and Figure 2 As shown, a contactor testing device of the present invention includes a testing terminal 3. A guide group 2 is fixedly installed at the bottom end of the testing terminal 3. An alignment device 1 is fixedly installed at the top front end of the guide group 2. The alignment device 1 includes a first rack 4, a first pressure sensor 5, a QR code scanner 6, a support frame 7, and a transmission gear 8. The QR code scanner 6 is fixedly installed at the top front end of the support frame 7. The transmission gear 8 is rotatably installed at the top front end of the support frame 7 and is located at both ends of the QR code scanner 6. The first pressure sensor 5 is fixedly installed at the top front end of the support frame 7 and is located below the transmission gear 8. The first rack 4 is slidably inserted into the top front end of the support frame 7 and meshes with the transmission gear 8.

[0030] like Figure 3 The guide assembly 2 includes a feeding device 9, a transmission component 10, and a support device 11. The feeding device 9 is fixedly installed on the top front end of the support device 11. The transmission component 10 is slidably sleeved on the top front end of the support device 11 and is located below the feeding device 9, which can support the operation of the feeding device 9 and the transmission component 10.

[0031] like Figure 4 The feeding device 9 includes a support base 12, a positioning seat 13, a second pressure sensor 14, a connecting wire 15, and a positioning socket 16. The support base 12 is fixedly installed at the front end of the positioning seat 13, the second pressure sensor 14 is fixedly installed at the rear of both sides of the positioning seat 13, the connecting wire 15 is fixedly installed at equal intervals at the rear end of the positioning socket 16, and the positioning socket 16 is fixedly installed at the top rear end of the positioning seat 13. The support base 12 can support the contactor 20 to move.

[0032] like Figure 5 The transmission component 10 includes a displacement device 17, a contact device 18, a positioning plug 19, and a contactor 20. The contact device 18 is fixedly installed at the front end of the displacement device 17, the positioning plug 19 is placed inside the top of the displacement device 17, and the contactor 20 is fixedly installed at the front end of the positioning plug 19, which can support the positioning plug 19 and the contactor 20 to perform testing work.

[0033] like Figure 6The displacement device 17 includes a hexagonal rod 21, an anti-detachment piece 22, a positioning frame 23, a guide rod 24, a first spring 25, a support base 26, a side frame 27, a second spring 28, and a positioning sleeve 29. The first spring 25 and the guide rod 24 are symmetrically fixedly installed at the bottom front end of the support base 26, with the first spring 25 located on the outer ring of the guide rod 24. The side frame 27 is fixedly installed at both ends of the support base 26, and the positioning sleeve 29 is fixedly installed at the top end of the side frame 27. The hexagonal rod 21 and the second spring 28 are fixedly installed at the front end of the positioning sleeve 29, with the second spring 28 located on the outer ring of the hexagonal rod 21. The anti-detachment piece 22 is fixedly installed at the center front end of the hexagonal rod 21. The positioning frame 23 is slidably sleeved on the outer ring of the hexagonal rod 21. A round hole is provided inside the positioning frame 23, allowing the positioning frame 23 to pass through the anti-detachment piece 22.

[0034] like Figure 7 The contact device 18 includes a contact guide rod 30, a second rack 31, an L-shaped limiting rod 32, a support side rod 33, and a displacement crossbeam 34. The support side rod 33 is fixedly installed at both ends of the displacement crossbeam 34, the L-shaped limiting rod 32 is symmetrically fixedly installed at the bottom end of the displacement crossbeam 34, the contact guide rod 30 is fixedly installed at the top end of the support side rod 33, and the second rack 31 is fixedly installed at the top front end of the support side rod 33. With the setting of the L-shaped limiting rod 32, when the displacement crossbeam 34 is reset, the support base 26 can be pulled to move to the front end to reset.

[0035] like Figure 8 The support device 11 includes a lead screw 35, a drive motor 36, a guide rod 37, and a support base plate 38. The drive motor 36 is fixedly installed at the bottom front end of the support base plate 38, the lead screw 35 is fixedly installed at the center rear end of the drive motor 36, and the guide rods 37 are symmetrically fixedly installed at the front end of the support base plate 38, with the guide rods 37 located on both sides of the lead screw 35. By setting the guide rods 37, the displacement crossbeam 34 can be restricted to move in a straight line. At the same time, when the lead screw 35 rotates in both directions, it can drive the displacement crossbeam 34 to move forward and backward.

[0036] The support base 7 is fixedly installed at the top front end of the support base plate 38. The displacement crossbar 34 is threaded onto the outer ring of the lead screw 35. The front end of the first spring 25 is connected to the rear end of the displacement crossbar 34. The positioning seat 13 is fixedly installed at the top front end of the support base plate 38. A magnetic absorbing plate is fixedly installed at the top front end of the support base 7, and an iron plate is fixedly installed at the front end of the first rack 4. The magnetic absorbing plate and the iron plate are vertically aligned. A locking key is fixedly installed on the front surface of the first rack 4, and a support block is fixedly installed at the top front end of the support base 7. A slot is opened inside the support block. The second pressure sensor 14 is horizontally aligned with the contact guide rod 30. The second rack 31 meshes with the bottom end of the transmission gear 8. The thickness of the first rack 4 and the second rack 31 is 1 cm, the thickness of the transmission gear 8 is 3 cm, the first rack 4 and the second rack 31 are staggered, the positioning sleeve 29 has guide holes at both ends, the displacement crossbeam 34 has a threaded hole at the center, the displacement crossbeam 34 has symmetrical insertion holes at both ends that are compatible with the guide rod 37 and the guide rod 24, the positioning sleeve 29 has a groove at the top, the support base 26 has an insertion hole at the center, the positioning square frame 23 has a round hole at the center of the front end, the front end of the second spring 28 is connected to the rear end of the positioning square frame 23, and the second pressure sensor 14 is electrically connected to the test terminal 3.

[0037] The working principle is as follows: During use, first push the positioning frame 23 towards the end closest to the positioning sleeve 29 to reduce the distance between the positioning frame 23 and the positioning sleeve 29, while also compressing the second spring 28. Then, insert the alignment plug 19 into the groove inside the top of the positioning sleeve 29. Place the contactor 20 flat inside the support base 12, and then release the positioning frame 23. The elasticity of the second spring 28 will cause the positioning frame 23 to move and reset, thereby pressing the contactor 20 to restrict positioning. Furthermore, by sliding the positioning frame 23 on the hexagonal rod 21, it can be supported to move in a straight line. Simultaneously, the anti-detachment piece 22 prevents the positioning frame 23 from moving or falling off. Once the contactor 20 and the alignment plug 19 are in place... After the plug 19 is secured, the drive motor 36 can be turned on, driving the lead screw 35 to rotate. The displacement crossarm 34 is threaded onto the lead screw 35, so that when the lead screw 35 rotates, it can drive the displacement crossarm 34 to move closer to the test terminal 3. When the displacement crossarm 34 moves, it can drive the support base 26 to move synchronously by squeezing the first spring 25, so that the positioning sleeve 29 can drive the alignment plug 19 to move. At this time, when the displacement crossarm 34 moves, it can drive the second rack 31 to move to the bottom of the transmission gear 8, thereby driving the transmission gear 8 to rotate. When the transmission gear 8 rotates, it can drive the first rack 4 to move downward. The first rack 4 and the second rack 31 are misaligned to avoid interference. The key at the front end of the first rack 4 is used to support the support. The displacement of the slot in the top support block of the support frame 7 ensures that the first rack 4 moves downward in a straight line, and when the first rack 4 moves downward to its limit position, it can contact the first pressure sensor 5. An electrical connection exists between the first pressure sensor 5 and the QR code scanner 6, allowing the QR code scanner 6 to scan the QR code on the contactor 20 to confirm product information. Subsequently, when the alignment plug 19 is inserted into the alignment socket 16, it will prevent the support frame 26 from continuously displacing. Through the setting of the first spring 25, the displacement crossbar 34 can continuously displace towards the end closer to the test terminal 3. At this time, the contact guide rod 30 can move through the interior of the positioning sleeve 29 and contact the second pressure sensor 14, thereby triggering the second pressure sensor 14 to open the test terminal. 3. Connect the test terminal 3 via connecting wire 15 to energize the alignment socket 16 for contactor 20 testing. After contactor 20 testing is complete, turn on drive motor 36 to rotate lead screw 35 in the reverse direction. At this time, displacement crossbeam 34 can move away from test terminal 3. First, displacement crossbeam 34 can disengage contact guide rod 30 from second pressure sensor 14, energize alignment socket 16, and stop contactor 20 testing. As displacement crossbeam 34 moves away from test terminal 3, first spring 25 can return to its original position. At this time, L-shaped limit rod 32 can contact the rear end of support base 26. Subsequently, during subsequent displacement, displacement crossbeam 34 drives support base 26 to move forward and return to its original position via L-shaped limit rod 32.At this time, the support base 26 can drive the positioning sleeve 29 to move forward, causing the alignment plug 19 to be pulled out from the inside of the alignment socket 16. Furthermore, the second rack 31 can also pass in the opposite direction past the bottom end of the transmission gear 8, causing the transmission gear 8 to rotate in the opposite direction. This allows the first rack 4 to move upward. When the second rack 31 has completely passed the bottom end of the transmission gear 8, the first rack 4 can move upward to its limit position. At this time, the iron plate on the first rack 4 can be attracted to the magnetic plate at the top front end of the support base 7, which can restrict and fix the first rack 4, preventing it from falling downward prematurely. At this time, the QR code scanner 6 can stop operating. Subsequently, when the position... When the horizontal displacement frame 34 returns to its original position, the positioning frame 23 can be moved again towards the end closest to the positioning sleeve 29, allowing the contactor 20 to be released. Then, the alignment plug 19 is moved upwards, allowing the contactor 20 to be moved out of the support chassis 12, completing the testing of the contactor 20. In use, the horizontal displacement frame 34 slides onto the guide rod 37 at both ends, supporting its linear movement. Simultaneously, the guide rod 24, located within the inner ring of the first spring 25, prevents deformation or bending of the first spring 25 when the horizontal displacement frame 34 presses against it, thus completing the operation.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A contactor testing device, comprising a testing terminal (3), wherein a guide assembly (2) is fixedly installed at the bottom end of the testing terminal (3), and an alignment device (1) is fixedly installed at the top front end of the guide assembly (2), characterized in that: The alignment device (1) includes a first rack (4), a first pressure sensor (5), a QR code scanner (6), a support frame (7), and a transmission gear (8). The QR code scanner (6) is fixedly installed at the top front end of the support frame (7). The transmission gear (8) is rotatably installed at the top front end of the support frame (7) and is located at both ends of the QR code scanner (6). The first pressure sensor (5) is fixedly installed at the top front end of the support frame (7) and is located below the transmission gear (8). The first rack (4) is slidably inserted into the top front end of the support frame (7) and meshes with the transmission gear (8).

2. The contactor testing device according to claim 1, characterized in that: The guide assembly (2) includes a feeding device (9), a transmission component (10), and a support device (11). The feeding device (9) is fixedly installed at the top front end of the support device (11). The transmission component (10) is slidably sleeved on the top front end of the support device (11) and is located below the feeding device (9).

3. The contactor testing device according to claim 2, characterized in that: The feeding device (9) includes a support chassis (12), a positioning seat (13), a second pressure sensor (14), a connecting wire (15), and a positioning socket (16). The support chassis (12) is fixedly installed at the front end of the positioning seat (13), the second pressure sensor (14) is fixedly installed at the rear of both sides of the positioning seat (13), the connecting wire (15) is fixedly installed at equal intervals at the rear end of the positioning socket (16), and the positioning socket (16) is fixedly installed at the top rear end of the positioning seat (13).

4. The contactor testing device according to claim 3, characterized in that: The transmission component (10) includes a displacement device (17), a contact device (18), a positioning plug (19), and a contactor (20). The contact device (18) is fixedly installed at the front end of the displacement device (17), the positioning plug (19) is placed inside the top of the displacement device (17), and the contactor (20) is fixedly installed at the front end of the positioning plug (19).

5. The contactor testing device according to claim 4, characterized in that: The displacement device (17) includes a hexagonal rod (21), an anti-detachment piece (22), a positioning frame (23), a guide rod (24), a first spring (25), a support base (26), a side frame (27), a second spring (28), and a positioning sleeve (29). The first spring (25) and the guide rod (24) are symmetrically fixedly installed at the bottom front end of the support base (26), and the first spring (25) is located on the outer ring of the guide rod (24). The side frame (27) is fixedly installed at both ends of the support base (26). The positioning sleeve (29) is fixedly installed at the top end of the side frame (27). The hexagonal rod (21) and the second spring (28) are fixedly installed at the front end of the positioning sleeve (29), and the second spring (28) is located on the outer ring of the hexagonal rod (21). The anti-detachment piece (22) is fixedly installed at the center front end of the hexagonal rod (21). The positioning frame (23) is slidably sleeved on the outer ring of the hexagonal rod (21).

6. The contactor testing device according to claim 5, characterized in that: The contact device (18) includes a contact guide rod (30), a second rack (31), an L-shaped limiting rod (32), a support side rod (33), and a displacement crossbeam (34). The support side rod (33) is fixedly installed at both ends of the displacement crossbeam (34). The L-shaped limiting rod (32) is symmetrically fixedly installed at the bottom end of the displacement crossbeam (34). The contact guide rod (30) is fixedly installed at the top end of the support side rod (33). The second rack (31) is fixedly installed at the top front end of the support side rod (33).

7. A contactor testing device according to claim 6, characterized in that: The support device (11) includes a lead screw (35), a drive motor (36), a guide rod (37), and a support base plate (38). The drive motor (36) is fixedly installed at the bottom front end of the support base plate (38). The lead screw (35) is fixedly installed at the center rear end of the drive motor (36). The guide rod (37) is symmetrically fixedly installed at the front end of the support base plate (38), and the guide rod (37) is located on both sides of the lead screw (35).

8. The contactor testing device according to claim 7, characterized in that: The support base frame (7) is fixedly installed at the top front end of the support base plate (38), the displacement cross frame (34) is threaded onto the outer ring of the lead screw (35), the front end of the first spring (25) is connected to the rear end of the displacement cross frame (34), and the positioning seat (13) is fixedly installed at the top front end of the support base plate (38).

9. A contactor testing device according to claim 8, characterized in that: A magnetic absorbing plate is fixedly installed on the top front end of the support frame (7), and an iron plate is fixedly installed on the front end of the first rack (4). The magnetic absorbing plate and the iron plate are vertically aligned. A key is fixedly installed on the front surface of the first rack (4), and a support block is fixedly installed on the top front end of the support frame (7). A slot is opened inside the support block. The second pressure sensor (14) is horizontally aligned with the contact guide rod (30). The second rack (31) meshes with the bottom end of the transmission gear (8). The thickness of the first rack (4) and the second rack (31) is 1 cm. The thickness of the transmission gear (8) is 3 cm. The first rack (4) and the second rack (31) are meshed. The rack (31) is staggered. The positioning sleeve (29) has guide holes inside both ends. The displacement crossbeam (34) has a threaded hole in the center. The displacement crossbeam (34) has symmetrical insertion holes at both ends that are compatible with the guide rod (37) and the guide rod (24). The positioning sleeve (29) has a groove inside the top. The support base (26) has a through hole in the center. The positioning square frame (23) has a round hole in the center of the front end. The front end of the second spring (28) is connected to the rear end of the positioning square frame (23). The second pressure sensor (14) is electrically connected to the test terminal (3).

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