Locking mechanism for LED support locking and automatic reset compensation

Abstract

The utility model discloses a locking mechanism for LED support locking and automatic reset compensation, which comprises a seat body assembly, a connecting assembly, a pull rod, a buckling assembly and a locking assembly, the seat body assembly is arranged on one LED support, and one side of the seat body assembly is connected with the other LED support; the connecting assembly is arranged on the other side of the seat body assembly; the pull rod horizontally penetrates through the connecting assembly and the base assembly, one end of the pull rod extends to the outer portion of one side of the base assembly and is used for being buckled in the LED support, and the other end of the pull rod extends to the outer portion of the connecting assembly. The buckling assembly is rotatably connected to the outer part of the other end of the pull rod; the buckling assembly pushes the pull rod to linearly move in the horizontal direction when rotating. The locking assembly is rotationally connected to the lower portion of the connecting assembly, and the locking assembly and the buckling assembly are buckled with each other. According to the utility model, mutual positioning and relative position or angle locking and fixing of two adjacent LED supports are realized, the assembly precision is effectively ensured, and the assembly efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of LED screen assembly, in particular to a locking mechanism for locking an LED bracket and automatically resetting and compensating. Background Art

[0002] LED large screen is the development trend of the advertising industry. It is an indoor and outdoor advertising display device with audio and video functions. Its area can be adjusted at will. It can not only play audio and video advertising programs, but also install fixed light box advertising positions on all four sides. Outdoor LED large screen is an ideal alternative to canvas advertising and light box advertising. Outdoor full-color LED large screen is widely used in public places, advertising, urban road network, urban parking lot, railway, subway and other traffic guidance systems, highways, etc. The size of large LED screen is more than 1000mm. Therefore, in the actual assembly process, large LED screen is generally assembled by splicing multiple unit screens of equal area together, which can greatly reduce the moving space and the damage caused during the screen transportation process. The size of LED unit screen is generally more than 100mm, and in the assembly process, LED bracket is needed as the bearing support structure of the unit screen. After the LED bracket is assembled and spliced, the LED unit screen is placed in multiple LED bracket profiles spliced ​​together.

[0003] Therefore, in the process of assembling a large LED, it is first necessary to splice multiple LED brackets to form a frame with multiple unit screen bearing spaces, and then place multiple unit screens in different bearing spaces to splice to form a complete LED screen. During the process of splicing and assembling LED brackets, after the LED brackets are placed in the predetermined assembly position, the relative position or angle of the two adjacent LED brackets needs to be locked and fixed. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a locking mechanism for locking and automatically resetting LED brackets to achieve mutual positioning and relative position or angle locking of two adjacent LED brackets, effectively ensure assembly accuracy, and improve assembly efficiency.

[0005] The technical solution adopted by the utility model is as follows: a locking mechanism for locking and automatically resetting and compensating an LED bracket, comprising a base assembly, a connecting assembly, a pull rod, a snap-fit ​​assembly and a locking assembly, wherein the base assembly is arranged on an LED bracket, and one side of the base assembly is connected to another LED bracket; the connecting assembly is arranged on the other side of the base assembly; the pull rod horizontally passes through the connecting assembly and the base assembly, one end of the pull rod extends to the outside of one side of the base assembly for snapping into the LED bracket, and the other end of the pull rod extends to the outside of the connecting assembly; the snap-fit ​​assembly is rotatably connected to the outside of the other end of the pull rod; when the snap-fit ​​assembly rotates, it pushes the pull rod to move linearly in the horizontal direction; the locking assembly is rotatably connected to the lower part of the connecting assembly, and the locking assembly and the snap-fit ​​assembly are snapped together to lock and fix the snap-fit ​​assembly and the pull rod.

[0006] Preferably, the seat assembly includes a seat, and at least two conical grooves are formed on one side wall of the seat. The conical grooves are recessed inward from one side wall of the seat and cooperate with the conical columns on the LED bracket to position the seat.

[0007] Preferably, a through hole is opened in the middle of the seat body and passes through the left and right sides, and a spring hole is provided at one end of the through hole close to the other side of the seat body.

[0008] Preferably, the connecting assembly includes a connecting sleeve; the connecting sleeve is a cylindrical structure, one end of the connecting sleeve is provided with a connecting plate extending outward, the connecting plate is attached to the other side wall of the seat body and is fixed to the seat body by screws, and the middle part of the connecting sleeve is provided with a socket that passes through left and right.

[0009] Preferably, a buckle block is provided at one end of the pull rod, which is connected to one end of the pull rod in a direction perpendicular to the pull rod and is used to be buckled into another LED bracket so as to be connected to another LED bracket; a connecting hole is provided at the other end of the pull rod.

[0010] Preferably, a limit ring is provided on the pull rod, and the limit ring is embedded in the pull rod; a reset spring is provided on the side of the limit ring close to the seat body; the reset spring is provided on the pull rod, and when the pull rod is inserted into the through hole, the reset spring extends into the spring hole; the pull rod moves linearly toward the seat body in the through hole, the reset spring is compressed, and after the thrust force on the pull rod toward the seat body disappears, the elastic force of the reset spring drives the pull rod to slide and reset.

[0011] Preferably, the snap-fit ​​assembly includes a snap-fit ​​seat, a stacked spring and a sliding seat, wherein a U-shaped mounting groove is provided on one side of the snap-fit ​​seat, and a first connecting shaft is provided in the U-shaped mounting groove along the front-to-back direction; the connecting hole is rotatably mounted on the first connecting shaft; a horizontal groove body is provided on the left side of the U-shaped mounting groove; the stacked spring is arranged in the horizontal groove body; the sliding seat is inserted in the horizontal groove body and is located on the right side of the stacked spring, and the left end of the sliding seat is connected to the stacked spring; when the snap-fit ​​seat drives the sliding seat to rotate around the first connecting shaft, the sliding seat pushes the pull rod to the right, and the elastic force of the stacked spring keeps the sliding seat in contact with the pull rod.

[0012] Preferably, a through slot is provided below the U-shaped mounting slot; a second connecting shaft is provided in the through slot along the front-to-back direction.

[0013] Preferably, a connecting block is provided at the lower part of the connecting sleeve, a through hole is opened on the connecting block along the front-to-back direction, and a third connecting shaft is inserted into the through hole.

[0014] Preferably, the locking assembly includes a connecting seat, a locking spring and a locking rod, wherein the connecting seat is connected and fixed to the left end wall of the connecting sleeve; the locking rod is rotatably connected to the third connecting shaft and is connected to the third connecting shaft through the locking spring; a locking groove is provided on the locking rod; after the snap-fit ​​seat is rotated to a predetermined position, the locking rod passes through the through groove opened thereon, and the locking groove is embedded in the second connecting shaft for locking the snap-fit ​​seat.

[0015] The beneficial effects of the utility model are:

[0016] In view of the defects and shortcomings of the prior art, the utility model independently develops and designs a locking mechanism for locking and automatically resetting LED brackets, which can realize mutual positioning and relative position or angle locking of two adjacent LED brackets, effectively ensure assembly accuracy, and improve assembly efficiency.

[0017] The utility model is applied in the field of large-scale LED screen assembly, and aims to provide an auxiliary device for LED bracket assembly, which realizes the mutual positioning and relative position or angle locking and fixing of two adjacent LED brackets. Specifically, in actual use, the utility model can be fixedly set on one of the two adjacent LED brackets, and then snap-connected to the other LED bracket, so that the relative position or angle of the assembly of the two adjacent LED brackets on the left and right can be locked and fixed. Specifically, the base of the utility model is fixed on an LED bracket, and the conical groove arranged on the right side wall of the base cooperates with the conical column on the other LED bracket on the right side, so as to realize the positioning of the two adjacent LED brackets on the left and right; at the same time, the buckle block arranged on the right end of the pull rod inserted in the base body is buckled into the LED bracket on the right, and the left end of the pull rod is rotatably connected with a buckle assembly; when it is necessary to lock and fix the two adjacent LED brackets, the buckle seat of the buckle assembly can be rotated counterclockwise. When the buckle seat rotates counterclockwise, the pull rod is pulled to the left side, so that the buckle block of the pull rod pulls the LED bracket on the right side to the left, until the buckle seat is rotated to the locking position (such as the vertical direction), the left and right LED brackets are locked. The LED brackets are locked and fixed to each other; after the buckle seat is rotated to the locking position, the locking rod of the locking assembly passes through the through slot of the buckle seat, and the locking slot of the locking rod and the third connecting shaft in the through slot are mutually locked and locked, and the locking state is maintained by the elastic force provided to the locking rod by the locking spring. When disassembling, the user pushes the locking rod in the opposite direction to slide out from the third connecting shaft, and then rotates the buckle seat clockwise, and the buckle seat pushes the pull rod to the right to move linearly, so that the pressure of the buckle block on the right LED bracket disappears, so as to facilitate disassembly; through the above structure, the rotational movement of the buckle seat is converted into the linear movement of the pull rod, so that the mutual locking or loosening of two adjacent LED brackets is achieved, and fast and efficient locking is achieved. In addition, the left side of the U-shaped mounting groove of the buckle seat of the utility model is also provided with a stacked spring on the left side of the horizontal groove body, and a slide seat is provided on the right side of the stacked spring. The slide seat extends to the right into the U-shaped mounting groove, and maintains the state of contact with the left end of the pull rod through the elastic force provided by the stacked spring. This elastic contact method avoids the situation where the slide seat cannot push the pull rod due to locking gap or assembly error. In addition, a limiting ring and a reset spring are fixedly provided on the pull rod of the utility model. The reset spring is sleeved on the pull rod and is located on the right side of the limiting ring. The limiting ring limits the reset spring from the left side. When the pull rod is inserted into the seat body, the reset spring extends into the spring hole at the left end of the seat body through hole. When the thrust provided by the snap-fit ​​seat drives the pull rod to move to the right, the reset spring is compressed. When the thrust disappears, the elastic force provided by the reset spring drives the pull rod to slide in the opposite direction to reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the schematic diagrams of the component splitting structure of the utility model.

[0019] Figure 2 This is the second schematic diagram of the component splitting structure of the utility model.

[0020] Figure 3 This is one of the three-dimensional structural schematic diagrams of the utility model.

[0021] Figure 4 This is the second schematic diagram of the three-dimensional structure of the utility model.

[0022] Figure 5 This is one of the three-dimensional structural schematic diagrams of the components of the utility model.

[0023] Figure 6 This is the second schematic diagram of the three-dimensional structure of the components of the utility model.

[0024] Figure 7 It is a cross-sectional view of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figures 1 to 7As shown, the utility model proposes a locking mechanism for locking and automatically resetting and compensating an LED bracket, comprising a base assembly, a connecting assembly, a pull rod 3, a snap-fit ​​assembly and a locking assembly, wherein the base assembly is arranged on an LED bracket, and one side of the base assembly is connected to another LED bracket; the connecting assembly is arranged on the other side of the base assembly; the pull rod 3 horizontally passes through the connecting assembly and the base assembly, one end of the pull rod 3 extends to the outside of one side of the base assembly for snapping in the LED bracket, and the other end of the pull rod 3 extends to the outside of the connecting assembly; the snap-fit ​​assembly is rotatably connected to the outside of the other end of the pull rod 3; when the snap-fit ​​assembly rotates, it pushes the pull rod 3 to move linearly in the horizontal direction; the locking assembly is rotatably connected to the lower part of the connecting assembly, and the locking assembly and the snap-fit ​​assembly are snap-fitted with each other, so as to lock and fix the snap-fit ​​assembly and the pull rod 3. Example 1

[0029] As an embodiment of the utility model, the seat assembly of this embodiment includes a seat 1, and at least two conical grooves A are opened on one side wall of the seat 1. The conical groove A is recessed inward from one side wall of the seat 1 and cooperates with the conical column on the LED bracket to position the seat 1. Example 2

[0030] As an embodiment of the utility model, a through hole B is opened in the middle of the seat body 1 of this embodiment and passes through the seat body 1 from left to right. A spring hole is provided at one end of the through hole B close to the other side of the seat body 1.

[0031] A limiting ring 7 is sleeved on the pull rod 3, and the limiting ring 7 is embedded in the pull rod 3; a reset spring 8 is provided on the side of the limiting ring 7 close to the seat body 1; the reset spring 8 is sleeved on the pull rod 3, and when the pull rod 3 is inserted into the through hole B, the reset spring 8 extends into the spring hole; the pull rod 3 moves linearly toward the seat body 1 in the through hole B, and the reset spring 8 is compressed. After the thrust exerted on the pull rod 3 toward the seat body 1 disappears, the elastic force of the reset spring 8 drives the pull rod 3 to slide and reset. Example 3

[0032] As an embodiment of the utility model, a buckle block 4 is provided at one end of the pull rod 3 of this embodiment, and the buckle block 4 is connected to one end of the pull rod 3 in a direction perpendicular to the pull rod 3, and is used to buckle into another LED bracket so as to be connected to another LED bracket; the other end of the pull rod 3 is provided with a connecting hole D. Example 4

[0033] As an embodiment of the utility model, the connecting assembly of this embodiment includes a connecting sleeve 5; the connecting sleeve 5 is a cylindrical structure, one end of the connecting sleeve 5 is provided with a connecting plate 6 extending outward, the connecting plate 6 is attached to the other side wall of the seat body 1, and is fixed to the seat body 1 by screws, and the middle part of the connecting sleeve 5 is provided with a socket C that passes through the left and right. Example 5

[0034] As an embodiment of the utility model, the snap-fit ​​assembly of this embodiment includes a snap-fit ​​seat 12, a stacked spring 17 and a slide seat 18, wherein a U-shaped mounting groove E is provided on one side of the snap-fit ​​seat 12, and a first connecting shaft 13 is provided in the U-shaped mounting groove E along the front-to-back direction; the connecting hole D is rotatably sleeved on the first connecting shaft 13; a horizontal groove body is provided on the left side of the U-shaped mounting groove E; the stacked spring 17 is arranged in the horizontal groove body; the slide seat 18 is inserted in the horizontal groove body and is located on the right side of the stacked spring 17, and the left end of the slide seat 18 is connected to the stacked spring 17; when the snap-fit ​​seat 12 drives the slide seat 18 to rotate around the first connecting shaft 13, the slide seat 18 pushes the pull rod 3 to the right, and the elastic force of the stacked spring 17 keeps the slide seat 18 in contact with the pull rod 3. Example 6

[0035] As an embodiment of the present utility model, a through slot F is provided below the U-shaped installation slot E of this embodiment; a second connecting shaft 14 is provided in the through slot F along the front-to-back direction.

[0036] A connecting block 15 is provided at the lower part of the connecting sleeve 5 . A through hole is formed in the connecting block 15 along the front-rear direction. A third connecting shaft 16 is inserted into the through hole.

[0037] The locking assembly includes a connecting seat 9, a locking spring 10 and a locking rod 11, wherein the connecting seat 9 is connected and fixed to the left end wall of the connecting sleeve 5; the locking rod 11 is rotatably connected to the third connecting shaft 16, and is connected to the third connecting shaft 16 through the locking spring 10; a locking groove G is provided on the locking rod 11; after the snap-fit ​​seat 12 is rotated to a predetermined position, the locking rod 11 passes through the through groove F opened thereon, and the locking groove G is engaged on the second connecting shaft 14, which is used to lock the snap-fit ​​seat 12.

[0038] Furthermore, the utility model designs a locking mechanism for locking and automatically resetting the LED brackets, which can realize the mutual positioning and relative position or angle locking of two adjacent LED brackets, effectively ensure the assembly accuracy, and improve the assembly efficiency. The utility model is applied in the field of large-scale LED screen assembly, and aims to provide an auxiliary device for LED bracket assembly, which functions to realize the mutual positioning and relative position or angle locking of two adjacent LED brackets. Specifically, in actual use, the utility model can be fixedly set on one of the two adjacent LED brackets, and then snap-fitted to the other LED bracket, and the relative position or angle locking of the two adjacent LED brackets on the left and right can be realized by the utility model. Specifically, the base of the utility model is fixed on an LED bracket, and the conical groove arranged on the right side wall of the base cooperates with the conical column on the other LED bracket on the right side, so as to realize the positioning of the two adjacent LED brackets on the left and right; at the same time, the buckle block arranged on the right end of the pull rod inserted in the base body is buckled into the LED bracket on the right, and the left end of the pull rod is rotatably connected with a buckle assembly; when it is necessary to lock and fix the two adjacent LED brackets, the buckle seat of the buckle assembly can be rotated counterclockwise. When the buckle seat rotates counterclockwise, the pull rod is pulled to the left side, so that the buckle block of the pull rod pulls the LED bracket on the right side to the left, until the buckle seat is rotated to the locking position (such as the vertical direction), the left and right LED brackets are locked. The LED brackets are locked and fixed to each other; after the buckle seat is rotated to the locking position, the locking rod of the locking assembly passes through the through slot of the buckle seat, and the locking slot of the locking rod and the third connecting shaft in the through slot are mutually locked and locked, and the locking state is maintained by the elastic force provided to the locking rod by the locking spring. When disassembling, the user pushes the locking rod in the opposite direction to slide out from the third connecting shaft, and then rotates the buckle seat clockwise, and the buckle seat pushes the pull rod to the right to move linearly, so that the pressure of the buckle block on the right LED bracket disappears, so as to facilitate disassembly; through the above structure, the rotational movement of the buckle seat is converted into the linear movement of the pull rod, so that the mutual locking or loosening of two adjacent LED brackets is achieved, and fast and efficient locking is achieved. In addition, the left side of the U-shaped mounting groove of the buckle seat of the utility model is also provided with a stacked spring on the left side of the horizontal groove body, and a slide seat is provided on the right side of the stacked spring. The slide seat extends to the right into the U-shaped mounting groove, and maintains the state of contact with the left end of the pull rod through the elastic force provided by the stacked spring. This elastic contact method avoids the situation where the slide seat cannot push the pull rod due to locking gap or assembly error. In addition, a limiting ring and a reset spring are fixedly provided on the pull rod of the utility model. The reset spring is sleeved on the pull rod and is located on the right side of the limiting ring. The limiting ring limits the reset spring from the left side. When the pull rod is inserted into the seat body, the reset spring extends into the spring hole at the left end of the seat body through hole. When the thrust provided by the snap-fit ​​seat drives the pull rod to move to the right, the reset spring is compressed. When the thrust disappears, the elastic force provided by the reset spring drives the pull rod to slide in the opposite direction to reset.

[0039] The embodiments of the utility model are only to introduce its specific implementation methods and are not intended to limit its protection scope. The technicians in this industry can make some modifications inspired by the embodiments, so any equivalent changes or modifications made in accordance with the scope of the utility model patent are within the scope of the claims of the utility model patent.

Claims

1. A locking mechanism for locking and automatically resetting an LED bracket, arranged between two adjacent LED brackets, characterized in that: It comprises a seat assembly, a connecting assembly, a pull rod (3), a buckling assembly and a locking assembly, wherein: The base assembly is arranged on an LED bracket, and one side of the base assembly is connected to another LED bracket; The connecting assembly is arranged on the other side of the seat assembly; The pull rod (3) passes through the connecting assembly and the base assembly horizontally, one end of the pull rod (3) extends to the outside of one side of the base assembly for buckling into the LED bracket, and the other end of the pull rod (3) extends to the outside of the connecting assembly; The buckle assembly is rotatably connected to the outside of the other end of the pull rod (3); when the buckle assembly rotates, it pushes the pull rod (3) to move linearly in the horizontal direction; The locking assembly is rotatably connected to the lower part of the connecting assembly, and the locking assembly and the buckling assembly are buckled with each other to lock and fix the buckling assembly and the pull rod (3).

2. The locking mechanism for locking and automatically resetting the LED bracket according to claim 1 is characterized in that: The base assembly comprises a base (1), the other side of the base (1) being provided with a fixing portion (2) extending outward, the base (1) being connected and fixed to an LED bracket via the fixing portion (2); at least two conical grooves (A) are provided on one side wall of the base (1), the conical grooves (A) being recessed inward from one side wall of the base (1) and cooperating with conical columns on another LED bracket for positioning.

3. The locking mechanism for locking and automatically resetting the LED bracket according to claim 2 is characterized in that: A through hole (B) is provided in the middle of the seat body (1) and passes through the seat body (1) from left to right, and a spring hole is provided at one end of the through hole (B) close to the other side of the seat body (1).

4. The locking mechanism for locking and automatically resetting the LED bracket according to claim 3 is characterized in that: The connection assembly comprises a connection sleeve (5); the connection sleeve (5) is a cylindrical structure, one end of the connection sleeve (5) is provided with a connection plate (6) extending outward, the connection plate (6) is fitted on the other side wall of the seat body (1) and is fixed to the seat body (1) by screws, and the middle part of the connection sleeve (5) is provided with a plug hole (C) passing through left and right.

5. The locking mechanism for locking and automatically resetting the LED bracket according to claim 4 is characterized in that: A buckle block (4) is provided at one end of the pull rod (3), and the buckle block (4) is connected to one end of the pull rod (3) in a direction perpendicular to the pull rod (3) and is used to be buckled into another LED bracket so as to be connected to another LED bracket; a connecting hole (D) is provided at the other end of the pull rod (3).

6. The locking mechanism for locking and automatically resetting the LED bracket according to claim 5, characterized in that: The pull rod (3) is sleeved with a limit ring (7), and the limit ring (7) is embedded in the pull rod (3); a return spring (8) is provided on the side of the limit ring (7) close to the seat body (1); the return spring (8) is sleeved on the pull rod (3), and when the pull rod (3) is inserted into the through hole (B), the return spring (8) extends into the spring hole; the pull rod (3) moves linearly in the through hole (B) toward the seat body (1), the return spring (8) is compressed, and after the thrust force on the pull rod (3) toward the seat body (1) disappears, the elastic force of the return spring (8) drives the pull rod (3) to slide and return to its original position.

7. The locking mechanism for locking and automatically resetting the LED bracket according to claim 6, characterized in that: The snap-fit ​​assembly comprises a snap-fit ​​seat (12), a stacked spring (17) and a slide seat (18), wherein a U-shaped mounting groove (E) is provided on one side of the snap-fit ​​seat (12), and a first connecting shaft (13) is provided in the U-shaped mounting groove (E) along the front-rear direction; the connecting hole (D) is rotatably sleeved on the first connecting shaft (13); a horizontal groove body is provided on the left side of the U-shaped mounting groove (E); the stacked spring (17) is arranged in the horizontal groove body; the slide seat (18) is inserted into the horizontal groove body and is located on the right side of the stacked spring (17), and the left end of the slide seat (18) is connected to the stacked spring (17); when the snap-fit ​​seat (12) drives the slide seat (18) to rotate around the first connecting shaft (13), the slide seat (18) pushes the pull rod (3) to the right, and the elastic force of the stacked spring (17) enables the slide seat (18) to maintain a contact state with the pull rod (3).

8. The locking mechanism for locking and automatically resetting the LED bracket according to claim 7, characterized in that: A through slot (F) is provided below the U-shaped installation slot (E); a second connecting shaft (14) is provided in the through slot (F) along the front-to-back direction.

9. The locking mechanism for locking and automatically resetting the LED bracket according to claim 8, characterized in that: A connecting block (15) is provided at the lower part of the connecting sleeve (5), a through hole is provided on the connecting block (15) along the front-rear direction, and a third connecting shaft (16) is inserted into the through hole.

10. The locking mechanism for locking and automatically resetting the LED bracket according to claim 9, characterized in that: The locking assembly comprises a connecting seat (9), a locking spring (10) and a locking rod (11), wherein the connecting seat (9) is connected and fixed to the left end wall of the connecting sleeve (5); the locking rod (11) is rotatably connected to the third connecting shaft (16) and is connected to the third connecting shaft (16) through the locking spring (10); a locking groove (G) is provided on the locking rod (11); after the buckling seat (12) is rotated to a predetermined position, the locking rod (11) passes through the through groove (F) provided thereon, and the locking groove (G) is engaged with the second connecting shaft (14) for locking the buckling seat (12).

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