Battery cover plate detection jig

By designing a detection tool for battery cover, using a probe to electrically connect the busbar and connector on the battery cover, and connecting it with the electrical performance tester, the problem of inaccurate electrical performance detection caused by wire connection errors is solved, and higher detection accuracy and safety are achieved.

CN223006237UActive Publication Date: 2025-06-20HENAN JIAJIANCAO INTELLIGENT TECH CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202421290511.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-07
Publication Date
2025-06-20
Estimated Expiration
2034-06-07

AI Technical Summary

Technical Problem

In the production process of battery cover, wire connection errors are common, resulting in inaccurate electrical performance detection and affecting the safety and reliability of the product.

Method used

A battery cover detection tool is designed, including a bottom plate, a handheld module and an upper cover. It is electrically connected to the busbar and connector on the battery cover through several first probes and second probes, and is connected to the electrical performance tester through a socket to realize conduction test and voltage withstand voltage test.

Benefits of technology

The detection tool is simple in structure and easy to use, which can ensure the correct connection between the busbar on the battery cover and the connector and the probe, improving the accuracy and safety of electrical performance detection.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN223006237U_ABST
    Figure CN223006237U_ABST
Patent Text Reader

Abstract

The utility model provides a battery cover plate detection jig, which comprises a bottom plate and at least one handheld module, an upper cover is rotatably arranged on the bottom plate, a plurality of first fixing plates and a plurality of second fixing plates are arranged in the middle of the upper end face of the bottom plate at intervals, and a plurality of through holes are formed in the first fixing plates and the second fixing plates. A first probe is arranged in at least one penetrating through hole in the first fixing plate and the second fixing plate; a plurality of sockets are arranged on one side face of the bottom plate, the first probes are connected to at least one socket through wires, the handheld module is located on the outer side of the bottom plate, a profiling groove is formed in the upper end face of the handheld module, and the second probes are arranged in the profiling groove and connected to at least one socket through wires. According to the battery cover plate detection jig, the plurality of probes arranged on the bottom plate can be electrically connected with the plurality of busbars on the battery cover plate respectively, the plurality of second probes in the handheld module are electrically connected with the contacts in the connector connecting holes of the battery cover plate respectively, and then the plurality of sockets on one side of the bottom plate are connected to the flat cable seat of the electrical performance tester respectively. And the conduction test and the withstand voltage test are realized through the electrical property detector.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of battery cover plate detection, in particular to a battery cover plate detection jig. Background Art

[0002] The battery cover plate, also known as an integrated busbar, is simply called a wire harness CCS, and mainly includes a plastic structural member, a busbar arranged on the plastic structural member, a connector, and a wire connecting the busbar and the connector. During the production process of CCS products, operators weld the first end of the wire to the busbar, and the second end of the wire needs to be inserted into the connection hole of the connector (or called a sheath) to form a contact point. One contact point in a connection hole corresponds to one busbar.

[0003] In actual production, multiple wires are wrapped with an insulating outer sheath to form a wire harness, and multiple wire harnesses are wrapped with cable ties to form a complete product. However, during the process of installing the wires into the connector, there may be cases of incorrect connection. Therefore, after the battery cover plate is manufactured, its electrical performance needs to be detected, mainly including conduction testing and withstand voltage testing, to ensure accurate wire connection and ensure the safety and reliability of the product during actual use. For safety and detection accuracy, the battery cover plate needs to be placed on the detection jig to fix the battery cover plate and realize the electrical connection between the busbars at both ends of each wire and the contact points in the connection holes of the connector, and then use an electrical performance tester to detect the battery cover plate. Summary of the Invention

[0004] The utility model provides a battery cover plate detection jig for placing a battery cover plate and realizing the electrical connection between the busbar and the connector on the battery cover plate and the socket on the jig, so as to facilitate subsequent conduction testing and withstand voltage testing using an electrical performance tester.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A battery cover plate detection jig, comprising a bottom plate and at least one handheld module. A top cover is rotatably arranged on the bottom plate. In the middle of the upper end surface of the bottom plate, a number of first fixing plates are arranged at intervals. A number of through holes are formed in the first fixing plates, and at least one first probe is arranged in one of the through holes. A number of second fixing plates are arranged on the front side and the rear side of the first fixing plates. A number of through holes are formed in the second fixing plates, and at least one first probe is arranged in one of the through holes. Around the upper end surface of the bottom plate outside the second fixing plates, a number of positioning blocks are arranged. A first step is formed in the positioning blocks, and the top surface height of the first step is higher than the top surface heights of the first fixing plates and the second fixing plates. A number of sockets are arranged on one side surface of the bottom plate. A number of first probes are connected to at least one socket through wires. The handheld module is located outside the bottom plate. A profiling groove is formed in the upper end surface of the handheld module, and a number of second probes are arranged in the profiling groove. A number of second probes are connected to at least one socket through wires.

[0007] Preferably, a number of stoppers are arranged at intervals on the upper end surface of the bottom plate in front of and behind the second fixing plates. A second step is formed in the stoppers, and the top surface height of the second step is equal to the top surface height of the first step.

[0008] Preferably, a first buckle assembly for fixing the top cover is arranged on the bottom plate. The positioning block in the middle of the front side of the upper end surface of the bottom plate extends forward and upward to form a supporting part, and the first buckle assembly is arranged on the top surface of the supporting part.

[0009] Preferably, the first buckle assembly includes a buckle main body and a first wrench. A first through groove penetrating through the rear side and an adjacent side of the buckle main body is formed in the buckle main body. The first wrench is rotatably arranged in the first through groove through a rotating shaft, and a torsion spring is sleeved on the rotating shaft. There are two first buckle assemblies, symmetrically arranged on the top surface of the supporting part.

[0010] Preferably, the bottom plate includes a lower bottom plate and an upper bottom plate. The upper bottom plate is arranged above the lower bottom plate through a supporting block, and a sandwich layer is formed between the upper bottom plate and the lower bottom plate. Two sockets are arranged on one side edge of the sandwich layer between the upper bottom plate and the lower bottom plate through a mounting plate. The wires connecting a number of first probes and a number of second probes to their corresponding sockets are all arranged in the sandwich layer.

[0011] Preferably, a fixing strip for sealing the sandwich layer is arranged on the side surface of the sandwich layer between the upper bottom plate and the lower bottom plate. An outlet block is arranged on the front side edge of the sandwich layer between the upper bottom plate and the lower bottom plate. A wire passing through hole is formed in the outlet block. The wires connecting a number of second probes to their corresponding sockets are introduced into the sandwich layer from the wire passing through hole.

[0012] Preferably, a plurality of first hinge seats are arranged at intervals on the rear side of the upper end surface of the base plate, and the upper cover is rotatably arranged on the first hinge seats on the rear side of the upper end surface of the base plate through hinges.

[0013] Preferably, the upper cover comprises an upper cover plate and an upper cover pressure plate, the upper cover pressure plate is arranged above the upper cover plate through a support block, and an interlayer is formed between the upper cover pressure plate and the upper cover plate, a makeshift through hole connected to the interlayer is opened on the upper cover plate, and the interlayer side walls of the upper cover pressure plate and the upper cover plate are arranged to have a sealing interlayer fixing strip.

[0014] Preferably, a handle is provided on the upper cover, and the handle is located on the upper cover pressure plate.

[0015] Preferably, a second snap-fit ​​assembly is provided on one side of the upper end surface of the handheld module, the second snap-fit ​​assembly includes a snap-fit ​​seat and a second wrench, a second through slot is provided on one side of the snap-fit ​​seat close to the contoured groove, and the second wrench is tilted and rotatably arranged in the second through slot through a rotating shaft.

[0016] Compared with the prior art, the beneficial effects of the utility model are: the battery cover plate detection jig has a simple structure and is easy to use. Several first probes arranged on the base plate can be electrically connected to several bus bars on the battery cover plate respectively, and several second probes in the contoured grooves of the handheld module are electrically connected to the contacts in the connecting holes of the battery cover plate connector respectively, and then are respectively connected to the cable holder of the electrical performance tester through several sockets on one side of the base plate, and the conduction test and voltage resistance test are realized through the electrical performance tester. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 This is a schematic structural diagram of the utility model from another angle after the handheld module is removed.

[0019] Figure 3 This is a schematic diagram of the structure of the handheld module.

[0020] Figure 4 It is a structural schematic diagram of the first buckle assembly.

[0021] In the figure: 1. Bottom plate; 2. Handheld module; 3. Upper cover; 4. First fixing plate; 5. Second fixing plate; 6. Positioning block; 7. Socket; 8. Stop block; 9. First probe; 10. Second probe; 11. Support part; 12. Buckle body; 13. First wrench; 4. Mounting plate 1; 15. Fixed block; 16. Profile fixing strip; 17. Wire outlet block; 18. First hinge seat; 19. Hinge; 20. Relief through hole; 21. Handle; 22. Buckle seat; 23. Second wrench; 6-1. First step; 8-1. Second step; 12-1. First through slot; 13-1, 23-1. Locking end; 13-2. Dialing end. Detailed implementation manner

[0022] In order to make the purpose, technical solution and advantages of the present utility model clearer and more understandable, the present utility model will be further described below in conjunction with the specific implementation manner. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0023] The present utility model provides a battery cover detection jig, including a bottom plate 1 and at least one handheld module 2. An upper cover 3 is rotatably arranged on the bottom plate 1. In the middle of the upper end surface of the bottom plate 1, a number of first fixing plates 4 are arranged at intervals. A number of through holes 4-1 are opened on the first fixing plates 4, and at least one first probe 9 is arranged in at least one through hole 4-1. A number of second fixing plates 5 are arranged on the front side and the rear side of the first fixing plates 4. A number of through holes 5-1 are opened on the second fixing plates 5, and at least one first probe 9 is arranged in at least one through hole. The shapes and numbers of the first fixing plates and the second fixing plates are determined by the busbars arranged on the battery cover, and are not specifically limited. Around the upper end surface of the bottom plate 1 outside the second fixing plates 5, a number of positioning blocks 6 are arranged. The positioning blocks are in an L-shaped structure. A first step 6-1 is opened on the positioning blocks 6, and the top surface height of the first step is higher than the top surface heights of the first fixing plates and the second fixing plates. The first step is used to support the plastic structure part of the battery cover and position the battery cover, so as to quickly place it on the basis of ensuring that the busbars on the lower side of the battery cover are quickly aligned with the probes. A number of sockets 7 are arranged on one side surface of the bottom plate 1. A number of first probes 10 are connected to at least one socket through wires. The handheld module 2 is located outside the bottom plate. A profiling groove 2-1 is opened on the upper end surface of the handheld module 2. A number of second probes 10 are arranged in the profiling groove 2-1. A number of second probes 10 are connected to at least one socket through wires. Except for the first probes, the second probes and the sockets, all the components arranged on this detection jig are made of insulating materials.

[0024] Among them, the upper cover mainly plays a protective role to protect the operator and prevent dangerous accidents caused by the operator accidentally touching the battery cover during the withstand voltage test. The top surface heights of the first fixing plate and the second fixing plate are smaller than the top surface height of the first step, considering that the probe needs to extend a certain height to contact the bus bar. At least one probe corresponds to one bus bar. When the area of the bus bar is large, multiple probes can correspond to it.

[0025] At the same time, the depths of the steps of the positioning block and the stop block are both adapted to the thickness of the plastic structure of the battery cover. After the battery cover is placed, its top surface is flush with the top surfaces of the positioning block and the stop block. After the upper cover is flipped, it is attached to the top surfaces of the positioning block and the stop block. The profiling groove on the upper end surface of the handheld module is adapted to the connector.

[0026] In this embodiment, 2 sockets are arranged, both of which are horn sockets, corresponding to a number of first probes and a number of second probes respectively. The two sockets are respectively connected to the cable socket of the electrical performance tester through the docking seat. The cable socket communicates with the electrical performance detector, and then the electrical performance tester is used to realize the conduction test and withstand voltage test of the battery cover.

[0027] The number of sockets is related to the number of first probes and second probes. Since each bus bar on the battery cover is connected to the connector through a wire, that is, the first end of the wire is welded to the bus bar, and the second end of the wire needs to be inserted into the connection hole of the connector. One connection hole corresponds to one bus bar. The number of first probes should be at least equal to the number of bus bars, and the number of second probes is equal to the number of bus bars. It is known that a horn socket has 64 points, corresponding to 64 probes. When the number of bus bars on the battery cover is small, there may be 1-2 connectors. At this time, the number of first probes on the jig is small, and the number of handheld modules is equal to the number of connectors. The first probes and the second probes can be connected to the same socket through wires, or the first probes and the second probes are respectively connected to their respective sockets through wires. When the number of bus bars is large, there may be more than 2 connectors. At this time, the number of first probes on the jig is large. The first probes can be connected to 2 or more sockets through wires, and there are more than 2 handheld modules. The second probes are connected to another 2 or more sockets through wires.

[0028] Since the battery cover has a certain weight, in order to ensure its stability, a number of stop blocks 8 are arranged at intervals on the upper end surfaces of the bottom plates located in front of and behind the second fixing plate. The stop block 8 is provided with a second step 8-1, and the top surface height of the second step is equal to the top surface height of the first step.

[0029] In this embodiment, the bottom plate 1 is provided with a first buckle assembly for fixing the upper cover, the positioning block located in the middle of the front side of the upper end of the bottom plate extends forward and upward to form a support portion 11, and the first buckle assembly is arranged on the top surface of the support portion 11. The first buckle assembly is used to fix and lock the upper cover.

[0030] Specifically, the first buckle assembly includes a buckle body 12 and a first wrench 13. The buckle body 13 is provided with a first through slot 12-1 that runs through its rear side and an adjacent side. The first wrench 13 is rotatably arranged in the first through slot 12-1 via a rotating shaft, and a torsion spring is sleeved on the rotating shaft. There are two first buckle assemblies, which are symmetrically arranged on the top surface of the support portion. One end of the first wrench 13 located at the rear side of the buckle body 12 extends out to form a locking end 13-1, and one end located at the adjacent side of the buckle body 12 extends out to form a toggle end 13-2. The first wrench is provided with an open slot on the inner side close to the first through slot, and the torsion spring is arranged in the open slot.

[0031] Figure 1 , Figure 2 , Figure 4 The figure shows the natural state of the first wrench under the action of the torsion spring without the action of external force. At this time, under the action of the torsion spring, the rear locking end of the first wrench naturally extends out. When in use, push the second wrench toggle end forward, and the locking end rotates into the first through-slot. At this time, the upper cover can be turned over to place it on the top of the positioning block and the stopper, and then the second wrench toggle end is released. Under the action of the torsion spring, the first wrench automatically returns to the initial state, the locking end extends out, and its rear bevel edge presses against the side wall of the upper cover plate backward, thereby fixing the upper cover plate.

[0032] Since both the first probe and the second probe need to be connected to their respective sockets through wires, in order to facilitate the arrangement of the wires, the base plate 1 includes a lower base plate 1-1 and an upper base plate 1-2, and the upper base plate 1-2 is arranged above the lower base plate 1-1 through a support block, and a sandwich is formed between the upper base plate 1-2 and the lower base plate 1-1; the two sockets 8 are arranged on one side of the sandwich between the upper base plate and the lower base plate through a mounting plate 14, and the wires connecting the first probes, the second probes and their corresponding sockets are all arranged in the sandwich.

[0033] At the same time, the interlayer side of the upper base plate 1-2 and the lower base plate 1-1 is provided with a profile fixing strip 16 for sealing the interlayer through a fixing block 15, and the front side of the interlayer of the upper base plate 1-2 and the lower base plate 1-1 is provided with a wire outlet block 17, which has a wire through hole, so that the second probe wires of the handheld module are conveniently introduced into the interlayer from the wire through hole and connected to the corresponding socket. The interlayer is sealed by the profile fixing strip, and the whole is more beautiful. In order to place it stably, a rubber pier is provided on the lower end surface of the bottom plate, and the rubber pier is located on the lower bottom plate.

[0034] In this embodiment, a plurality of first hinge seats 18 are arranged at intervals on the rear side of the upper end surface of the bottom plate 1, and the upper cover 3 is rotatably arranged on the first hinge seat 18 on the rear side of the upper end surface of the bottom plate through hinges 19. A plurality of first hinge seats 19 are arranged on the upper bottom plate, and the first hinge seats are rectangular blocks, which are mainly used to raise the height of the upper cover to ensure that the upper cover is arranged in contact with the top surface of the positioning block and the stopper after being turned over, and the hinge is fixed on the rear side of the first hinge seat; a plurality of second hinge seats are arranged on the side wall of the upper cover parallel to the rear side of the first hinge seat, and the hinge is fixed on the second hinge seat, and the second hinge seat is a rectangular piece, which is mainly used to increase the force bearing area and facilitate the fixing of the hinge.

[0035] In addition, considering that most battery cover plates have positioning columns or other special-shaped parts on one side away from the bus, the corresponding position of the upper cover needs to be slotted to make way, but for safety reasons, the positioning columns or other special-shaped parts of the battery cover plate cannot leak out. Therefore, in this embodiment, the upper cover 3 includes an upper cover plate 3-1 and an upper cover pressure plate 3-2, the upper cover pressure plate 3-2 is arranged above the upper cover plate 3-1 through a support block, and an interlayer is formed between the upper cover pressure plate 3-2 and the upper cover plate 3-1, and the upper cover plate 3-1 is provided with a through hole 20 connected to the interlayer, and the interlayer side walls of the upper cover pressure plate 3-2 and the upper cover plate 3-1 are provided with a profile fixing strip for sealing the interlayer through a fixing block. The setting and sealing of the upper cover pressure plate and the upper cover plate are the same as those of the upper base plate and the lower base plate. Correspondingly, the second hinge seat is arranged on the profile fixing strip.

[0036] Furthermore, a handle 21 is provided on the upper cover 3, and the handle 21 is located on the upper cover pressing plate 3-2.

[0037] Furthermore, a second buckle assembly is provided on one side of the upper end surface of the handheld module, and the second buckle assembly is used to fix the connector on one side of the battery cover. The second buckle assembly includes a buckle seat 22 and a second wrench 23. The buckle seat 22 has a second through-slot on one side close to the contoured groove 2-1. The second wrench 23 is tilted and rotatably arranged in the second through-slot through a rotating shaft, and a torsion spring is sleeved on the rotating shaft. The end of the second wrench located in front of the second through-slot of the buckle seat extends out to form a locking end 23-1, and the end located above the buckle seat extends out to form a toggle end; the second wrench has an open slot on the inner side close to the second through-slot, and the torsion spring is arranged in the open slot. Figure 1 , Figure 3The figure shows the natural state of the second wrench under the action of the torsion spring without the action of external force. At this time, under the action of the torsion spring, the locking end of the second wrench naturally extends out. When in use, lift the toggle end of the second wrench upwards, and the locking end rotates downwards into the second through-groove, which does not affect the placement of the connector into the contoured groove. After the connector is placed, release the other end of the second wrench, and under the action of the torsion spring, the locking end naturally extends out, and its upper beveled end abuts against the outer side wall of the connector, pressing the connector forward, so that the connector abuts against the front side inside the contoured groove to achieve locking.

[0038] The use process of this detection jig is as follows: first, connect several sockets on one side of the bottom plate to the cable holder of the electrical performance tester, and turn on the electrical performance tester; then place the battery cover on the jig bottom plate, and the several buses on the battery cover correspond to the several first probes one by one to achieve electrical connection, cover the upper cover, and then insert each connector on the battery cover into the contoured groove of its corresponding handheld module, and extend the second probe into the connecting hole of the connector to electrically connect with the contact (the other end of the wire connected to the bus is inserted into the connecting hole to form a contact); at this time, it can be considered that the buses at both ends of each wire on the battery cover and the contacts in each connecting hole of the connector are connected to the corresponding sockets through the first probe and the second probe respectively, and the socket is connected to the cable holder through the docking seat to form a complete test circuit. Next, the electrical performance tester is used to perform a conduction test and a withstand voltage test.

[0039] The above description is only the preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications, combinations and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the scope of the claims of the utility model.

Claims

1. A battery cover plate detection jig, characterized in that: The invention comprises a base plate and at least one handheld module, wherein an upper cover is rotatably provided on the base plate, a plurality of first fixing plates are arranged at intervals in the middle of the upper end surface of the base plate, a plurality of through holes are provided on the first fixing plate, and a first probe is arranged in at least one through hole, a plurality of second fixing plates are arranged on the front side and the rear side of the first fixing plate, a plurality of through holes are provided on the second fixing plate, and a first probe is arranged in at least one through hole; a plurality of positioning blocks are arranged around the upper end surface of the base plate located on the outer side of the second fixing plate, a first step is provided on the positioning block, and the top surface height of the first step is higher than the top surface height of the first fixing plate and the second fixing plate; a plurality of sockets are arranged on a side surface of the base plate, and a plurality of first probes are connected to at least one socket through wires, and the handheld module is located on the outer side of the base plate, and a profiling groove is provided on the upper end surface of the handheld module, and a plurality of second probes are arranged in the profiling groove, and the plurality of second probes are connected to at least one socket through wires.

2. The battery cover plate detection jig according to claim 1, characterized in that: A plurality of stoppers are arranged at intervals on the upper end surfaces of the bottom plate located at the front and rear sides of the second fixed plate. A second step is provided on the stoppers, and the top surface height of the second step is equal to the top surface height of the first step.

3. The battery cover plate detection jig according to claim 1, characterized in that: The bottom plate is provided with a first buckle assembly for fixing the upper cover, the positioning block located in the middle of the front side of the upper end of the bottom plate extends forward and upward to form a supporting portion, and the first buckle assembly is arranged on the top surface of the supporting portion.

4. The battery cover plate detection jig according to claim 3, characterized in that: The first buckle assembly includes a buckle body and a first wrench. The buckle body is provided with a first through slot penetrating its rear side and an adjacent side. The first wrench is rotatably arranged in the first through slot via a rotating shaft. A torsion spring is sleeved on the rotating shaft. There are two first buckle assemblies, which are symmetrically arranged on the top surface of the support part.

5. The battery cover plate detection jig according to claim 1, characterized in that: The base plate includes a lower base plate and an upper base plate, wherein the upper base plate is arranged above the lower base plate through a support block, and a sandwich is formed between the upper base plate and the lower base plate; the two sockets are arranged on one side of the sandwich between the upper base plate and the lower base plate through a mounting plate, and the wires connecting the first probes, the second probes and their corresponding sockets are all arranged in the sandwich.

6. The battery cover plate detection jig according to claim 5, characterized in that: The interlayer sides of the upper base plate and the lower base plate are provided with fixing strips for sealing the interlayer, and the front sides of the interlayer of the upper base plate and the lower base plate are provided with wire outlet blocks, and the wire outlet blocks have wire through holes, and the wires connected to the second probes and their corresponding sockets are introduced into the interlayer through the wire through holes.

7. The battery cover plate detection jig according to claim 1, characterized in that: A plurality of first hinge seats are arranged at intervals on the rear side of the upper end surface of the bottom plate, and the upper cover is rotatably arranged on the first hinge seats on the rear side of the upper end surface of the bottom plate through hinges.

8. The battery cover plate detection jig according to claim 1, characterized in that: The upper cover comprises an upper cover plate and an upper cover pressure plate, wherein the upper cover pressure plate is arranged above the upper cover plate through a support block, and an interlayer is formed between the upper cover pressure plate and the upper cover plate, and a clearance through hole connected to the interlayer is opened on the upper cover plate, and the interlayer side walls of the upper cover pressure plate and the upper cover plate are arranged to have a sealing interlayer fixing strip.

9. The battery cover plate detection jig according to claim 8, characterized in that: The upper cover is provided with a handle, and the handle is located on the upper cover pressure plate.

10. The battery cover plate detection jig according to claim 1, characterized in that: A second snap assembly is arranged on one side of the upper end surface of the handheld module, and the second snap assembly includes a snap seat and a second wrench. A second through slot is provided on one side of the snap seat close to the contoured groove, and the second wrench is tilted and rotatably arranged in the second through slot through a rotating shaft.