A battery pack connector

Abstract

The present application relates to a battery pack connector, and relates to the technical field of automotive batteries, which includes a pin terminal and a socket terminal. The pin terminal can be inserted into the socket terminal, and a first insulating shell is fixed to the tail end of the pin terminal. The outer side of the end of the first insulating shell is hingedly provided with a plurality of wrapping sheets, and all the wrapping sheets are arranged together around the pin terminal, and a lock buckle is fixedly provided on the inner side of the wrapping sheet; a second insulating shell is fixed to the tail end of the socket terminal, and a bracket is fixedly provided at the end of the second insulating shell, and the bracket is sleeved outside the socket terminal, and the inner wall of the wrapping sheet can fit with the outer wall of the bracket, and the outer wall of the bracket is penetrated with a plurality of lock holes, and the lock buckle can be inserted into the lock hole and abut against the side wall of the lock hole, and a locking piece is provided on the first insulating shell. The present application has the effect of improving the integrity of the connection structure, ensuring the strength of the mating connection state between the pin terminal and the socket terminal and the reliability of the mating.

Description

Technical Field

[0001] The present application relates to the field of battery connection technology, and in particular to a battery pack connector. Background Art

[0002] The battery pack connector is a connector element used to connect battery cells or modules. It is a key component that combines the cells to form a battery pack. It ensures the electrical and mechanical connection between batteries, supports the transmission of current and maintains the structural stability of the battery pack.

[0003] A battery pack connector is designed in the related technology, which includes a pin terminal, a socket terminal, and a threaded sleeve. The pin terminal can be inserted into the socket terminal. A first insulating shell is fixedly provided on the pin terminal, and the pin terminal is connected to a wiring harness in the first insulating shell. A second insulating shell is fixedly provided on the socket terminal, and the socket terminal is connected to the wiring harness in the second insulating shell. Connecting threads are provided on the outer sides of the tops of the first insulating shell and the second insulating shell. When the two terminals are connected, the pin terminal is inserted into the socket terminal, the tops of the first insulating shell and the second insulating shell are abutted, and the threaded sleeve is simultaneously engaged with the connecting threads on the first insulating shell and the second insulating shell.

[0004] In the process of implementing the present application, it was found that there are at least the following problems in this technology: when the two terminals are in a mating connection state, the threaded sleeve is engaged with the connecting threads on the first insulating shell and the second insulating shell at the same time, the engagement strength is difficult to ensure, and the integrity of the connection structure is poor. Once the first insulating shell and the second insulating shell are subjected to bending force, the threads at the connection are easily damaged and cause thread slippage, and there are no restrictions on both sides of the threaded sleeve, so the threaded sleeve is easily twisted and loosened. Summary of the invention

[0005] In order to improve the integrity of the connection structure and ensure the strength and reliability of the mating connection state between the pin terminal and the socket terminal, the present application provides a battery pack connector.

[0006] The battery pack connector provided in this application adopts the following technical solution:

[0007] A battery pack connector comprises a pin terminal and a socket terminal, wherein the pin terminal can be inserted into the socket terminal, a first insulating shell is fixed to the tail end of the pin terminal, a plurality of wrapping sheets are hingedly provided on the outer side of the end of the first insulating shell, all of the wrapping sheets are arranged together around the pin terminal, and a locking buckle is fixedly provided on the inner side of the wrapping sheet; a second insulating shell is fixed to the tail end of the socket terminal, a bracket is fixedly provided on the end of the second insulating shell, the bracket is sleeved outside the socket terminal, the inner wall of the wrapping sheet can be fitted with the outer wall of the bracket, a plurality of locking holes are formed through the outer wall of the bracket, the locking buckle can be inserted into the locking hole and abut against the side wall of the locking hole, and a locking piece is provided on the first insulating shell, and the locking piece is used to keep the wrapping sheet and the bracket in a state of fitting each other.

[0008] By adopting the above technical scheme, when the two terminals are connected in a mating manner, the pin terminal is first inserted into the socket terminal to achieve electrical connection; the wrapping sheet is wrapped on the outer wall of the bracket, and all the wrapping sheets together form a cylindrical bracket, at this time, a double-layer sleeve structure is formed between all the wrapping sheets and the bracket, which helps to improve the integrity of the connection structure between the pin terminal and the socket terminal; after the wrapping sheet is wrapped on the bracket, the locking buckle is inserted into the corresponding locking hole, and the locking buckle abuts against the side wall of the locking hole, so that the wrapping sheet and the bracket are firmly fixed in connection, thereby preventing the pin terminal and the socket terminal from axially disengaging, and preventing the pin terminal and the socket terminal from axially slipping and loosening; finally, the locking piece maintains the mutual fit between the wrapping sheet and the bracket, preventing the wrapping sheet from opening, and making the connection structure more stable; thereby improving the integrity of the connection structure, ensuring the strength of the mating connection state between the pin terminal and the socket terminal and the reliability of the mating.

[0009] Preferably, the locking piece is a covering sleeve, a straight hole is formed in the covering sleeve, the inner wall of the straight hole is slidably matched with the first insulating shell, the wrapping sheet can enter the straight hole, and the inner wall of the straight hole can be attached to and abutted against the outer wall of the wrapping sheet.

[0010] By adopting the above technical solution, when it is necessary to keep the wrapping sheet and the supporting tube in a state of mutual contact, the covering sleeve is slid, and the covering sleeve gathers all the wrapping sheets. The inner wall of the straight hole in the covering sleeve fits and abuts against the outer wall of the wrapping sheet, and the wrapping sheet is pressed tightly against the supporting tube. At this time, the wrapping sheet is reliably clamped between the covering sleeve and the supporting tube, and the wrapping sheet cannot naturally deflect and open, thereby further improving the stability of the two-terminal connection.

[0011] Preferably, an expanded hole is opened at one end of the covering sliding sleeve, and the expanded hole is opened in a conical shape. The small diameter end of the expanded hole is connected to the straight hole, and the large diameter end of the expanded hole is connected to the end of the covering sliding sleeve.

[0012] By adopting the above technical solution, before the wrap sheet enters the straight hole, it will first contact with the inner wall of the expanded hole. The expanded hole helps to guide the wrap sheet to enter the straight hole after it is gathered, making the gathering action of the wrap sheet smoother; in addition, when the pin terminal and the socket terminal are separated (that is, the wrap sheet and the bracket are separated from each other), the wrap sheet is driven out of the straight hole so that the wrap sheet is located in the expanded hole and can be turned outward, thereby realizing the disengagement action of the lock buckle and the lock hole. In this state, all the wrap sheets are separated from each other, and a single wrap sheet is relatively fragile. The design of the expanded hole enables the wrap sheet to complete the outward turning action while still being protected by the covering sleeve, thereby minimizing the wrap sheet from being directly exposed to the outside and damaged by bumps.

[0013] Preferably, a frustum is fixedly provided on the outer wall of the second insulating shell, the frustum is arranged in a conical shape and is adapted to the expanded hole, and the frustum can extend into the expanded hole and abut against the inner wall of the expanded hole.

[0014] By adopting the above technical solution, when the wrapping sheet is located in the straight hole, the cone extends into the expanded hole and abuts against the inner wall of the expanded hole, thereby filling the inside of the expanded hole and reducing the internal gap of the wrapped slide when the two terminals are connected in a mating state, which has a supporting effect on the wrapped slide, protects the wrapped slide, further improves the impact strength of the mating structure, and plays a limiting support role on one end of the wrapped sleeve, preventing the covered sleeve from continuing to slide and detaching from the wrapping sheet.

[0015] Preferably, the outer wall of the frustum is covered and fixed with a sealing skin layer.

[0016] By adopting the above technical solution, the design of the sealing cortex reduces the connection gap between the cone and the expanded hole, improves the sealing performance in the mating connection state, protects the pin terminal and the socket terminal, and prevents external liquid from entering the connection structure from between the cone and the expanded hole.

[0017] Preferably, a threaded section is provided on the outer side wall of the first insulating shell at one end away from the pin terminal, and a nut is threadedly mounted on the threaded section, and the nut can abut against the end of the covering sliding sleeve.

[0018] By adopting the above technical solution, after completing the docking of the cone and the expanded hole, the nut is rotated, the nut engages with the threaded section and slides toward the covering sleeve, which plays a limiting locking role on the other end of the covering sleeve. At this time, the covering sleeve cannot slide on the cone and the nut, thereby fixing the position of the covering sleeve; after separating the pin terminal and the socket terminal, the nut is located at the tail end of the threaded section. At this time, the nut prevents the covering sleeve from completely detaching from the first insulating shell, so that the covering sheet is located in the expanded hole to protect the covering sheet.

[0019] Preferably, the nut can be disengaged from the threaded section.

[0020] By adopting the above technical solution, when the wrapping sheet is damaged, the nut can be rotated so that the nut can be detached from the tail end of the threaded section, so that the covering slide can be completely detached from the first insulating shell, exposing the wrapping sheet and the first insulating shell to facilitate replacement of the wrapping sheet.

[0021] Preferably, a sealing groove is provided at the end of the nut, a sealing ring is clamped in the sealing groove, one end of the sealing ring is exposed from the sealing groove, and the sealing ring can be abutted against the end of the covering sliding sleeve.

[0022] By adopting the above technical solution, the design of the sealing ring reduces the connection gap between the nut and the end of the covering sleeve, improves the sealing performance in the mating connection state, protects the pin terminal and the socket terminal, and prevents external liquid from entering the interior of the connection structure from between the cone and the expanded hole; and the design of the sealing groove helps to limit the sealing ring and repair and replace it.

[0023] Preferably, a guide protrusion is fixedly provided on the outer side of the first insulating shell, and a guide groove is formed on the inner wall of the straight hole and the expanded hole, and the guide protrusion is slidably matched with the guide groove.

[0024] By adopting the above technical solution, when the covering sleeve slides on the first insulating shell, the sliding cooperation between the guide protrusion and the guide groove limits the covering sleeve and the first insulating shell to sliding movement, hinders the circumferential rotation of the first insulating shell in the covering sleeve, and minimizes the first insulating shell from rotating with the nut when the nut is tightened; when the covering sleeve needs to be separated from the first insulating shell, since the guide groove is jointly opened on the inner wall of the straight hole and the expanded hole, it is convenient for the guide protrusion to directly separate from the guide groove from the expanded hole.

[0025] Preferably, an inclined surface is obliquely provided on one side of the lock buckle, and the inclined surface abuts against the outer side edge of the lock hole.

[0026] By adopting the above technical solution, when it is necessary to drive the package sheet to be turned outward and away from the support tube, the second insulating shell is driven to rotate sideways in the direction of the inclined surface of the lock buckle, and the outer edge of the lock hole presses against the inclined surface and slides, and the inclined surface guides the lock buckle away from the lock hole, thereby pushing the lock buckle out of the lock hole, so that all the package sheets are quickly turned outward and separated from the support tube.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. By providing a first insulating shell, a wrapping sheet, a locking buckle, a second insulating shell, a bracket, a locking hole, and a locking piece, a double-layer sleeve structure is formed between the wrapping sheet and the bracket, which helps to improve the integrity of the connection structure between the pin terminal and the socket terminal, improve the integrity of the connection structure, and ensure the strength of the matching connection state between the pin terminal and the socket terminal and the reliability of the matching;

[0029] 2. By setting the covering sleeve, straight hole and expanded hole, when the two terminals are connected, it is convenient to quickly guide and gather all the wrapping pieces, so that all the wrapping pieces are wrapped together and pressed against the support tube, further improving the stability of the connection between the two terminals. When the two terminals are separated, the wrapping pieces can be turned outward in the expanded hole, which plays a protective role on the wrapping pieces;

[0030] 3. By setting the frustum, sealing cortex, threaded section, nut, sealing groove and sealing ring, the connection gap of the matching structure is reduced, the sealing performance in the matching connection state is improved, a closed connection environment is provided for the connection structure, the pin terminal and the socket terminal are protected, and external liquid is prevented from entering the connection structure from between the frustum and the expansion hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a battery pack connector mating connection state provided in an embodiment of the present application.

[0032] Figure 2 It is a schematic cross-sectional structure diagram of a battery pack connector in a mating connection state provided in an embodiment of the present application.

[0033] Figure 3 It is a schematic diagram of the structure of the pin terminal in the embodiment of the present application.

[0034] Figure 4 It is a schematic diagram of the structure of the socket terminal in the embodiment of the present application.

[0035] Figure 5 It is a schematic diagram of the cross-sectional structure of the covered sliding sleeve in the embodiment of the present application.

[0036] Explanation of the reference numerals: 1. Pin terminal; 11. First insulating shell; 111. Threaded section; 112. Nut; 1121. Sealing groove; 1122. Sealing ring; 113. Guide protrusion; 2. Socket terminal; 21. Second insulating shell; 211. Support tube; 2111. Lock hole; 212. Cone; 2121. Sealing leather layer; 3. Wrapping sheet; 31. Lock buckle; 311. Inclined surface; 4. Covering sleeve; 41. Straight hole; 42. Enlarged hole; 43. Guide groove. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The present application embodiment discloses a battery pack connector. Figure 1 and Figure 2 , which includes a pin terminal 1 and a socket terminal 2, wherein the pin terminal 1 can be inserted into the socket terminal 2. A first insulating shell 11 is fixed at the tail end of the pin terminal 1, and the pin terminal 1 is connected to the wiring harness in the first insulating shell 11. A second insulating shell 21 is fixed at the tail end of the socket terminal 2, and the socket terminal 2 is connected to the wiring harness in the second insulating shell 21.

[0039] Reference Figure 3 and Figure 4 Six wrapping sheets 3 are hingedly provided on the outer side of the end of the first insulating shell 11, and all the wrapping sheets 3 are arranged together around the pin terminal 1, and a lock buckle 31 is fixedly provided on the inner side of the wrapping sheet 3. A bracket 211 is fixedly provided on the end of the second insulating shell 21, and the bracket 211 is sleeved outside the socket terminal 2. The inner wall of the wrapping sheet 3 can fit with the outer wall of the bracket 211. Six locking holes 2111 are opened through the outer wall of the bracket 211, and the lock buckle 31 can be inserted into the locking hole 2111 and abut against the side wall of the locking hole 2111.

[0040] Reference Figure 2 and Figure 5The first insulating shell 11 is also provided with a locking piece, which is used to keep the wrapping sheet 3 and the support tube 211 in a state of mutual contact. The locking piece is a covering sleeve 4, in which a straight hole 41 and a reaming hole 42 are provided. The inner wall of the straight hole 41 is slidably matched with the first insulating shell 11, and the wrapping sheet 3 can enter the straight hole 41, and the inner wall of the straight hole 41 can be in contact with and abut against the outer wall of the wrapping sheet 3. The covering sleeve 4 has an reaming hole 42 at one end, which is tapered, and the small diameter end of the reaming hole 42 is connected to the straight hole 41, and the large diameter end of the reaming hole 42 is connected to the end of the covering sleeve 4.

[0041] Reference Figures 2 to 5 When the two terminals are connected, the pin terminal 1 is first inserted into the socket terminal 2 to achieve electrical connection. Then, the sheathing sleeve 4 is driven to slide close to the connection position between the pin terminal 1 and the socket terminal 2, and the inner wall of the expanded hole 42 on the sheathing sleeve 4 abuts against all the wrapping sheets 3, and guides the wrapping sheets 3 to enter the straight hole 41 after being gathered. The inner wall of the straight hole 41 presses the wrapping sheets 3 onto the support tube 211, and the wrapping sheets 3 are now reliably clamped between the sheathing sleeve 4 and the support tube 211. All the wrapping sheets 3 are wrapped together on the outer wall of the support tube 211, and form a cylindrical wrapping support tube 211. At this time, a multi-layer sleeve structure is formed between all the wrapping sheets 3, the support tube 211, and the sheathing sleeve 4, which improves the bending resistance and integrity of the connection structure. After the wrapping sheets 3 are wrapped on the support tube 211, the lock buckle 31 is inserted into the corresponding lock hole 2111, and the wrapping sheets 3 and the support tube 211 are further locked circumferentially. The pin terminal 1 and the socket terminal 2 are prevented from axially sliding and loosening, thereby ensuring the strength of the mating connection state between the pin terminal 1 and the socket terminal 2 and the reliability of the mating.

[0042] Reference Figures 3 to 5 In addition, it should be noted that when the wrapping sheet 3 and the support tube 211 are separated from each other, the wrapping sheet 3 only needs to be separated from the straight hole 41 and enter the expanded hole 42. At this time, the wrapping sheet 3 can be turned outward, so that the lock buckle 31 can be separated from the lock hole 2111, and then the socket terminal 2 can be pulled out of the pin terminal 1. In this state, all the wrapping sheets 3 are separated from each other, and a single wrapping sheet 3 and its rotation connection are relatively fragile. While the expanded hole 42 can complete the outward movement, the wrapping sheet 3 is still protected by the covering sliding sleeve 4, so as to avoid the wrapping sheet 3 being directly exposed to the outside and damaged by bumps.

[0043] In order to further improve the sealing performance and stability in the mating connection state, refer to Figure 3 A cone 212 is fixedly arranged on the outer wall of the second insulating shell 21. The cone 212 is arranged in a conical shape and is adapted to the reaming hole 42. The cone 212 can extend into the reaming hole 42 and abut against the inner wall of the reaming hole 42. Thus, the inside of the reaming hole 42 is filled, which has a supporting effect on the inside of the covered sliding piece, and further improves the resistance strength of the matching structure. A sealing skin layer 2121 is covered and fixed on the outer wall of the cone 212.

[0044] Reference Figure 2 and Figure 5 A threaded section 111 is provided on the outer wall of the first insulating shell 11 at the end away from the pin terminal 1. A nut 112 is threadedly assembled on the threaded section 111. The nut 112 can be disengaged from the threaded section 111. A sealing groove 1121 is provided at the end of the nut 112. A sealing ring 1122 is clamped in the sealing groove 1121. One end of the sealing ring 1122 is exposed from the sealing groove 1121. The sealing ring 1122 can be abutted against the end of the covering sleeve 4. After the frustum 212 and the reaming hole 42 are connected, the nut 112 is tightened to prevent the covering sleeve 4 from sliding on the frustum 212 and the nut 112, thereby fixing the position of the covering sleeve 4, further improving the sealing performance and stability in the mating connection state.

[0045] In order to avoid circumferential deflection between the first insulating shell 11 and the covering sliding sleeve 4 as much as possible, refer to Figure 2 A guide protrusion 113 is fixedly arranged on the outside of the first insulating shell 11, and a guide groove 43 is provided on the inner wall of the straight hole 41 and the expanded hole 42. The guide protrusion 113 slides and cooperates with the guide groove 43. The first insulating shell 11 is prevented from rotating circumferentially in the covering sleeve 4, and the first insulating shell 11 is prevented from rotating with the nut 112 when the nut 112 is screwed. When the covering sleeve 4 needs to be separated from the first insulating shell 11, the guide protrusion 113 directly separates from the guide groove 43 from the expanded hole 42.

[0046] In order to make the package sheet 3 quickly turn outward and leave the support tube 211, refer to Figure 3 and Figure 4 The lock buckle 31 has an inclined surface 311 on one side, and the inclined surface 311 abuts against the outer side of the lock hole 2111. The second insulating shell 21 is driven to rotate sideways toward the inclined surface 311 of the lock buckle 31, and the outer side of the lock hole 2111 abuts against the inclined surface 311 and slides, and the inclined surface 311 guides the lock buckle 31 away from the lock hole 2111, so that the lock buckle 31 is completely pushed out of the lock hole 2111, so that all the package sheets 3 are quickly turned outward and separated from the bracket 211.

[0047] The implementation principle of a battery pack connector in an embodiment of the present application is as follows: when the two terminals are connected, the pin terminal 1 is first inserted into the socket terminal 2 to achieve electrical connection. Then, the covering sleeve 4 is driven to slide close to the connection position between the pin terminal 1 and the socket terminal 2, and the inner wall of the expanded hole 42 on the covering sleeve 4 presses against all the wrapping sheets 3, and guides the wrapping sheets 3 to enter the straight hole 41 after being gathered. The inner wall of the straight hole 41 presses the wrapping sheets 3 onto the support tube 211, and the wrapping sheets 3 are now reliably clamped between the covering sleeve 4 and the support tube 211. All the wrapping sheets 3 are wrapped together on the outer wall of the support tube 211, and form a cylindrical wrapping support tube 211. The lock buckle 31 is inserted into the corresponding lock hole 2111, and the wrapping sheets 3 and the support tube 211 are further locked circumferentially. Finally, the nut 112 is tightened to prevent the covering sleeve 4 from sliding on the cone 212 and the nut 112, thereby fixing the position of the covering sleeve 4. A multi-layer sleeve structure is formed between all the wrapping sheets 3, the support tube 211, and the covering sliding sleeve 4, which improves the bending resistance and integrity of the connection structure, and ensures the strength and reliability of the matching connection state between the pin terminal 1 and the socket terminal 2. In addition, the matching structure has the characteristics of convenient connection and good waterproof performance.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack connector, comprising a pin terminal (1) and a socket terminal (2), wherein the pin terminal (1) can be inserted into the socket terminal (2), characterized in that: The pin terminal (1) is fixed with a first insulating shell (11) at its rear end, and a plurality of wrapping sheets (3) are hingedly arranged on the outer side of the end of the first insulating shell (11), and all the wrapping sheets (3) are arranged around the pin terminal (1), and a lock buckle (31) is fixedly arranged on the inner side of the wrapping sheet (3); the socket terminal (2) is fixed with a second insulating shell (21), and a bracket (211) is fixedly arranged on the end of the second insulating shell (21), and the bracket (211) is sleeved on the plug terminal. The outer wall of the wrapping sheet (3) can be fitted with the outer wall of the support tube (211); the outer wall of the support tube (211) is provided with a plurality of locking holes (2111); the locking buckle (31) can be inserted into the locking hole (2111) and abut against the side wall of the locking hole (2111); a locking piece is provided on the first insulating shell (11); the locking piece is used to maintain the fit state of the wrapping sheet (3) and the support tube (211); the locking piece is a covering sliding sleeve (4); the covering A straight hole (41) is provided in the sliding sleeve (4), the inner wall of the straight hole (41) is slidably matched with the first insulating shell (11), the wrapping sheet (3) can enter the straight hole (41), and the inner wall of the straight hole (41) can be attached to and abutted against the outer wall of the wrapping sheet (3); an expanded hole (42) is provided at one end of the covering sliding sleeve (4), the expanded hole (42) is opened in a conical shape, the small diameter end of the expanded hole (42) is connected to the straight hole (41), and the large diameter end of the expanded hole (42) is connected to the outer wall of the covering sliding sleeve (4). The ends are connected; a frustum (212) is fixedly arranged on the outer wall of the second insulating shell (21), the frustum (212) is arranged in a conical shape and is adapted to the expanded hole (42), the frustum (212) can extend into the expanded hole (42) and abut against the inner wall of the expanded hole (42); the outer wall of the wrapping sheet (3) can abut against the inner wall of the expanded hole (42), and when the outer wall of the wrapping sheet (3) abuts against the inner wall of the expanded hole (42), the lock buckle (31) is disengaged from the lock hole (2111).

2. A battery pack connector according to claim 1, characterized in that: The outer wall of the frustum (212) is covered and fixed with a sealing skin layer (2121).

3. A battery pack connector according to claim 1, characterized in that: A threaded section (111) is provided on the outer wall of the first insulating shell (11) at the end facing away from the pin terminal (1), and a nut (112) is threadedly mounted on the threaded section (111), and the nut (112) can abut against the end of the covering sliding sleeve (4).

4. A battery pack connector according to claim 3, characterized in that: The nut (112) can be disengaged from the threaded section (111).

5. A battery pack connector according to claim 3, characterized in that: A sealing groove (1121) is provided at the end of the nut (112), a sealing ring (1122) is clamped in the sealing groove (1121), one end of the sealing ring (1122) is exposed from the sealing groove (1121), and the sealing ring (1122) can abut against the end of the covering sliding sleeve (4).

6. A battery pack connector according to claim 1, characterized in that: A guide protrusion (113) is fixedly provided on the outside of the first insulating shell (11), a guide groove (43) is provided on the inner wall of the straight hole (41) and the expanded hole (42), and the guide protrusion (113) and the guide groove (43) are slidably matched.

7. A battery pack connector according to claim 1, characterized in that: An inclined surface (311) is obliquely provided on one side of the lock buckle (31), and the inclined surface (311) abuts against the outer side of the lock hole (2111).

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