CN214162770U

CN214162770U - Pressing device

Info

Publication number: CN214162770U
Application number: CN202022452849.6U
Authority: CN
Inventors: 刘得利; 润军; 卢羽; 叶国华; 董孝斌
Original assignee: Shenzhen Yuzhan Precision Technology Co ltd
Current assignee: Fulian Yuzhan Technology Shenzhen Co Ltd
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-09-10
Anticipated expiration: 2030-10-29

Abstract

A pressing device is used for pressing a first workpiece and a second workpiece and comprises a first supporting plate, a second supporting plate, a linkage part, a pressing wheel, a rotary buckle, a cover plate and a driving part, wherein the second supporting plate is laminated with the first supporting plate, the linkage part is provided with a plurality of concave parts, the linkage part is provided with a driving end and a pressing end, the pressing wheel is positioned on the second supporting plate and is arranged in the concave parts, the pressing wheel is provided with a rotating shaft which is connected with the pressing end of the linkage part, the rotary buckle is movably connected with the central shaft of the pressing wheel and is used for penetrating through the first supporting plate, the first workpiece and the second workpiece, the cover plate is used for pressing the first workpiece and the second workpiece, the cover plate comprises a clamping part which is used for clamping the rotary buckle, and the driving part is arranged on the first supporting plate and connected with the driving end of the linkage part, the pressing end used for driving the linkage part drives the pressing wheel to rotate and enables the rotating buckle to tension the cover plate, so that the cover plate presses the first workpiece and the second workpiece. The pressing device ensures the flatness of the pressed workpiece and improves the production efficiency.

Description

Pressing device

Technical Field

The application relates to the field of part assembly, in particular to a pressing device.

Background

In the part assembling process, the assembling difficulty of parts with flatness requirements is high, the manual assembling efficiency is low, and the flatness of the assembled parts cannot be guaranteed, so that the product quality is influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a pressing device which can ensure flatness and improve production efficiency.

The embodiment of the application provides a closing device for compress tightly first work piece and second work piece, including first backup pad, with second backup pad, interlock spare, pinch roller, rotatory knot, apron and the driving piece that first backup pad stromatolite set up, the second backup pad is used for bearing first work piece and second work piece, the second backup pad for the surface of first backup pad is equipped with a plurality of depressed parts, interlock spare is located between first backup pad and the second backup pad, interlock spare has the drive end and compresses tightly the end, the pinch roller is located between first backup pad and the second backup pad and set up in the depressed part, the pinch roller has the axis of rotation, rotation axis connection the end that compresses tightly of interlock spare, rotatory knot swing joint in the center pin of pinch roller and be used for passing first backup pad, The cover plate is used for compressing the first workpiece and the second workpiece, the cover plate comprises a clamping portion, the clamping portion is used for clamping the rotary buckle, the driving piece is arranged on the first supporting plate and connected with the driving end of the linkage piece and used for driving the compressing end of the linkage piece to drive the compressing wheel to rotate and enable the rotary buckle to tension the cover plate, and therefore the cover plate compresses the first workpiece and the second workpiece.

Further, in some embodiments of the present application, the pressing wheel is provided with a boss, the boss is disposed in the recessed portion and abuts against the pressing wheel, the pressing wheel is further provided with a chute, and the chute is used for rotating the pressing wheel to enable the boss to leave the chute, so as to control the rotating buckle to tighten the cover plate.

Further, in some embodiments of this application, the pinch roller still is equipped with first elastic component and retaining member, first elastic component, set up in on the center pin and support and hold rotatory knot for reset the position of rotatory knot, the retaining member is fixed in the pinch roller is used for locking the position of center pin.

Further, in some embodiments of the present application, the pressing wheel is further provided with a second elastic member, one end of the second elastic member is disposed in the first supporting plate, and the other end of the second elastic member abuts against the pressing wheel, so as to reset the position of the pressing wheel.

Further, in some embodiments of the present application, a connection portion of the sliding groove and the surface of the pressing wheel is provided with a slope structure to facilitate the boss to slide from the sliding groove to the surface of the pressing wheel.

Further, in some embodiments of this application, the interlock piece is equipped with the mounting hole, the mounting hole extends along the length direction that is perpendicular to the interlock piece, the axis of rotation set up in the periphery of pinch roller and be located the mounting hole to make the interlock piece drive when removing the pinch roller rotates.

Further, in some embodiments of the present application, the locking portion is provided with a locking groove, and two opposite sides of the locking groove are provided with protruding edges extending in the axial direction of the locking portion for locking the rotating buckle.

Further, in some embodiments of this application, the driving piece includes eccentric wheel, rotation axis and dwang, the eccentric wheel rotate connect in the drive end of interlock spare, the rotation axis is connected the eccentric wheel, the dwang is connected the rotation axis is in order to drive the eccentric wheel rotates, so that the motion of interlock spare.

Further, in some embodiments of the present application, the driving member further includes a supporting member and a limiting member, the supporting member is disposed in the first supporting plate, and the limiting member is connected to the supporting member and located on the rotation path of the rotation rod to limit the rotation position of the rotation rod.

Further, in some embodiments of the present application, the rotating buckle includes a connecting portion and a clamping portion, the connecting portion is installed in the central shaft, and one end of the connecting portion abuts against the first elastic member, the clamping portion is connected to the connecting portion, the clamping portion is disposed in the clamping groove, and the connecting portion is rotated to clamp the clamping portion on the convex edge.

The compressing device drives the linkage piece to drive the compressing wheel to rotate through the driving piece, so that the rotary buckle connected with the compressing wheel rotates together and tensions the cover plate, the cover plate compresses the first workpiece and the second workpiece, the flatness of the compressed workpieces is guaranteed, and the production efficiency is improved.

Drawings

Fig. 1 illustrates a schematic structural diagram of a pressing device in one embodiment.

Fig. 2 is a partially exploded view of a compression assembly in one embodiment.

Fig. 3 illustrates a schematic structural diagram of the second supporting plate in an embodiment.

Fig. 4 is a schematic structural diagram of a pressing module in an embodiment.

Fig. 5 illustrates a schematic structural diagram of a pinch roller in an embodiment.

Fig. 6 illustrates a schematic structural diagram of a cover plate in an embodiment.

Fig. 7 illustrates a schematic structural view of the driving member in one embodiment.

Description of the main Components

Pressing device 100

First support plate 10

Accommodation groove 11

First receptacle 111

Second receptacle 112

Second support plate 20

Recess 21

Supporting block 22

Positioning post 23

Pressing module 30

Linkage piece 31

Driving end 311

Through-hole 3111

Compression end 312

Mounting hole 3121

Power component 313

Pinch roller 32

Wheel body 321

Stopper 321a

Ramp structure 321b

Main body 3211

Extension 3212

Chute 3212a

Locking member 3212b

Through hole 3212c

Boss 3213

Rotating shaft 322

Center shaft 323

Groove 3231

First elastic member 324

Second elastic member 325

Rotating buckle 33

Connecting part 331

Catch 332

Cover plate 34

Clamping part 341

Card slot 3411

Convex edge 3412

Driving member 35

Eccentric wheel 351

Rotating shaft 352

Rotating rod 353

Rotating member 354

Support 355

Position limiter 356

Handle 357

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

The embodiment of the application provides a closing device for compress tightly first work piece and second work piece, including first backup pad, with second backup pad, interlock spare, pinch roller, rotatory knot, apron and the driving piece that first backup pad stromatolite set up, the second backup pad is used for bearing first work piece and second work piece, the second backup pad for the surface of first backup pad is equipped with a plurality of depressed parts, interlock spare is located between first backup pad and the second backup pad, interlock spare has the drive end and compresses tightly the end, the pinch roller is located between first backup pad and the second backup pad and set up in the depressed part, the pinch roller has the axis of rotation, rotation axis connection the end that compresses tightly of interlock spare, rotatory knot swing joint in the center pin of pinch roller and be used for passing second backup pad, The cover plate is used for compressing the first workpiece and the second workpiece, the cover plate comprises a clamping portion, the clamping portion is used for clamping the rotary buckle, the driving piece is arranged on the first supporting plate and connected with the driving end of the linkage piece and used for driving the compressing end of the linkage piece to drive the compressing wheel to rotate and enable the rotary buckle to tension the cover plate, and therefore the cover plate compresses the first workpiece and the second workpiece.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, a pressing device 100 shown in fig. 1 is used for pressing a first workpiece and a second workpiece. The pressing device 100 comprises a first supporting plate 10, a second supporting plate 20 and a pressing module 30, wherein the first supporting plate 10 and the second supporting plate 20 are arranged in a laminated mode, the second supporting plate 20 is used for bearing a first workpiece and a second workpiece, and the pressing module 30 is arranged on the first supporting plate 10 and the second supporting plate 20 and partially protrudes out of the second supporting plate 20 and is used for pressing the first workpiece and the second workpiece.

Referring to fig. 2, the first support plate 10 is provided with a plurality of receiving grooves 11. Each accommodating groove 11 includes a first accommodating portion 111 and a second accommodating portion 112, the second accommodating portion 112 is formed by extending the circumferential side of the first accommodating portion 111 outward in the radial direction thereof, and the first accommodating portion 111 and the second accommodating portion 112 are coaxially disposed. The first accommodating portion 111 and the second accommodating portion 112 are used for accommodating the pressing module 30.

Referring to fig. 2 and 3, a plurality of recesses 21 are formed on a side of the second support plate 20 opposite to the first support plate 10 for receiving a portion of the pressing module 30. The positions of the plurality of recesses 21 correspond to the positions of the plurality of receiving grooves 11, and are used for receiving the pressing module 30 and supporting the portion of the pressing module 30 protruding out of the second support plate 20 through the plurality of receiving grooves 11. The second support plate 20 is further provided at one side with a support block 22 fixed to the first support plate 10, and the support block 22 is connected to the pressing module 30 and is disposed adjacent to the second support plate 20. In an embodiment, a plurality of positioning posts 23 are further disposed on a side of the second support plate 20 facing away from the first support plate 10, for positioning the positions of the first workpiece and/or the second workpiece.

Referring to fig. 4, the pressing module 30 includes a linkage 31, a pressing wheel 32, a rotating buckle 33, a cover 34, and a driving member 35. The linkage member 31 is disposed in the second supporting plate 20, the pressing wheel 32 is connected to the linkage member 31, the rotating buckle 33 is disposed on the pressing wheel 32, the cover plate 34 is connected to the rotating buckle 33, and the driving member 35 is connected to the linkage member 31, so as to drive the linkage member 31 to drive the pressing wheel 32 to rotate and enable the rotating buckle 33 to tighten the cover plate 34, so that the cover plate 34 presses the first workpiece and the second workpiece.

The linkage piece 31 comprises a driving end 311 and a pressing end 312, the driving end 311 is connected with the driving piece 35, and the pressing end 312 is connected with the pressing wheel 32. In one embodiment, the driving end 311 is provided with a through hole 3111, the through hole 3111 extends along a direction perpendicular to a length direction of the linkage member 31, the driving member 35 is disposed in the through hole 3111 to drive the linkage member 31 to move along the length direction thereof, the pressing end 312 is provided with a mounting hole 3121, the mounting hole 3121 extends along a direction perpendicular to the length direction of the linkage member 31, and the pressing wheel 32 is disposed in the mounting hole 3121 to drive the pressing wheel 32 to rotate when the linkage member 31 moves.

The linkage member 31 further includes a power member 313, one end of the power member 313 is connected to the pressing end 312, and the other end is connected to the supporting block 22, so as to cooperate with the driving member 35 to move the position of the linkage member 31.

Referring to fig. 4 and 5, the pressing wheel 32 includes a wheel body 321, a rotating shaft 322 and a central shaft 323. One end of the wheel body 321 is disposed in the receiving groove 11 of the first supporting plate 10, and the other end is disposed in the recess 21 of the second supporting plate 20. The rotating shaft 322 is connected to the wheel body 321 and disposed in the mounting hole 3121 of the pressing end 312, for driving the wheel body 321 to rotate. The central shaft 323 is disposed inside the wheel 321 and connected to the rotating buckle 33, and is configured to rotate with the wheel 321 and drive the rotating buckle 33 to rotate together.

The wheel body 321 includes a main body 3211, an extending portion 3212 disposed on the peripheral side of the main body 3211 and extending outward in the radial direction, and a boss 3213 disposed on the extending portion 3212, wherein one end of the boss 3213 respectively abuts against the extending portion 3212, and the other end is fixed to the recess 21 of the second support plate 20. In an embodiment, the number of the extending portions 3212 is two, and the two extending portions 3212 are respectively disposed on the main body 3211 oppositely. The rotating shaft 322 is disposed between the two extending portions 3212, and a limiting block 321a is further disposed between the two extending portions 3212, and the limiting block 321a is used for cooperating with the linking member 31 to limit a rotating position of the wheel body 321. An extending portion 3212 adjacent to the rotating buckle 33 is provided with two sliding slots 3212a disposed oppositely, the sliding slots 3212a are disposed at an interface between the pressing wheel and the recess, and the sliding slots 3212a extend along a circumferential direction of the extending portion 3212. In an embodiment, a connection between one end of each sliding groove 3212a and the extending portion 3212 is provided with a slope 321b, which facilitates the sliding of the boss 3213 from the sliding groove 3212a to the surface of the extending portion 3212 and from the surface of the extending portion 3212 to the sliding groove 3212 a. The extending portion 3212 far away from the rotating buckle 33 is provided with a locking member 3212b, the locking member 3212b penetrates through a through hole 3212c of the extending portion 3212, the locking member 3212b abuts against the central shaft 323, the central shaft 323 is provided with a groove 3231 corresponding to the locking member 3212b, and an extending direction of the groove 3231 is perpendicular to an extending direction of the locking member 3212b, and is used for holding the position of the central shaft 323 after the central shaft 323 rotates. It can be understood that when the extending direction of the groove 3231 is perpendicular to the extending direction of the locking member 3212b, the locking member 3212b is held in the groove 3231 of the central shaft 323 after the central shaft 323 rotates 90 degrees.

The pressing wheel 32 further includes a first elastic member 324 and a second elastic member 325, the first elastic member 324 is sleeved on the central shaft 323 and abuts against the rotating buckle 33, for resetting the position of the rotating buckle 33 in the axial direction of the central shaft 323. The second elastic element 325 is disposed in the first receiving portion 111 at one end and in the main body 3211 at the other end to abut against the locking element 3212b, and is used for restoring the position of the wheel body 321 in the axial direction of the central shaft 323.

Referring to fig. 5, the rotating buckle 33 includes a connecting portion 331 and a holding portion 332, wherein the connecting portion 331 is disposed on the central shaft 323 and one end of the connecting portion is abutted against the first elastic member 324. The holding portion 332 is mounted on the connecting portion 331, a length direction of the holding portion 332 is perpendicular to a length direction of the connecting portion 331, and is used for being matched with the cover plate 34, and the holding portion 332 is held on the cover plate 34 by rotating the connecting portion 331.

Referring to fig. 6, the cover plate 34 includes a retaining portion 341, the retaining portion 341 has a slot 3411, the retaining portion 332 is disposed in the slot 3411, and two opposite sides of each slot 3411 are provided with a protruding edge 3412 extending in the axial direction of the retaining portion 341 for retaining the retaining portion 332 of the rotating buckle 33. The distance between the opposing convex edges 3412 corresponds to the width of the retainers 332, and when the turnbuckle 33 is not turned, the length direction of the retainers 332 of the turnbuckle 33 is consistent with the opening direction of the channel between the opposing convex edges 3412 for removing the cover plate 34. The distance between two opposite inner walls of the catching groove 3411 is adapted to the length of the catching portion 332, and after the rotating buckle 33 rotates, the length direction of the catching portion 332 of the rotating buckle 33 is perpendicular to the opening direction of the catching groove 3411.

It can be understood that the number of the pinch roller 32, the rotating buckle 33 and the blocking portion 341 are correspondingly arranged. The number of the pressing wheels 32, the rotating buckles 33 and the blocking parts 341 corresponds to the number of the positions of the assembled workpiece needing to be pressed, and can be adjusted according to the number of the positions of the assembled workpiece needing to be pressed. Taking three positions of the first workpiece and the second workpiece to be compressed as an example, three corresponding through holes are respectively arranged on the first workpiece and the second workpiece, the first workpiece and the second workpiece are stacked, so that the three through holes on the first workpiece are opposite to the three through holes on the second workpiece, the first workpiece and the second workpiece are provided with corresponding clamping structures, the first workpiece penetrates through the main body 3211 and the rotating buckle 33 on the main body 3211 and is positioned on the second supporting plate 20, then the second workpiece penetrates through the main body 3211 and the rotating buckle 33 on the main body 3211, is stacked on the first workpiece and corresponds to the position of the first workpiece, and then the first workpiece and the second workpiece are compressed through the cover plate 34.

Referring to fig. 4 and fig. 7, the driving member 35 includes an eccentric wheel 351, a rotating shaft 352, a rotating rod 353 and a rotating member 354, the eccentric wheel 351 is rotatably disposed in the through hole 3111 of the driving end 311 of the linking member 31 through the rotating member 354, the rotating shaft 352 is connected to the eccentric wheel 351, and the rotating rod 353 is connected to the rotating shaft 352 to rotate the eccentric wheel 351, so that the linking member 31 moves along the length direction thereof to rotate the pressing wheel 32. In an embodiment, the rotating member 354 is a cam structure, specifically, the rotating member 354 includes a flat surface and a circular surface, when opposite ends of the circular surface are respectively attached to the inner wall of the through hole 3111 perpendicular to the length direction, the rotating member 354 pushes the linking member 31 to move toward the pressing end 312, at this time, the linking member 31 drives the pressing wheel 32 to rotate, so that the rotating buckle 33 presses the cover plate 34, when the flat surface is attached to the inner wall of the through hole 3111 perpendicular to the length direction, at this time, a gap exists between the through hole 3111 and the rotating member 354, the power member 313 pushes the linking member 31 to move toward one end of the driving member 35, at this time, the linking member 31 drives the pressing wheel 32 to rotate reversely, so that the rotating buckle 33 releases the cover plate 34.

In one embodiment, the rotating rod 353 is provided with a retaining groove, the driving member 35 further includes a supporting member 355 and a limiting member 356, one end of the supporting member 355 is fixed on the first supporting plate 10, the other end is connected to the limiting member 356, and the limiting member 356 is located on the rotating path of the rotating rod 353. When the rotating rod 353 rotates to the position of the limiting member 356, the limiting member 356 is trapped in the retaining groove to limit the rotating position of the rotating rod 353.

In an embodiment, the rotating rod 353 is further provided with a handle 357, and the length direction of the handle 357 is perpendicular to the length direction of the rotating rod 353, so as to facilitate the rotation of the rotating rod 353.

When the pressing device 100 is used, first, the first workpiece and the second workpiece are respectively sequentially inserted into the main body 3211 and the rotating buckle 33 on the main body 3211, then the cover plate 34 is covered, so that the first workpiece and the second workpiece are located between the second supporting plate 20 and the cover plate 34, then the rotating rod 353 is rotated to drive the eccentric wheel 351 to rotate, so as to drive the linkage member 31 to move along the length direction thereof, and further drive the pressing wheel 32 to rotate through the rotating shaft 322, when the boss 3213 is located in the corresponding sliding slot 3212a, because the plane of the sliding slot 3212a is lower than the plane of the extending portion 3212, at this time, the second elastic member 325 supports the wheel body 321 to move upwards, when the boss 3213 slides to the surface of the extending portion 3212, at this time, the retaining portion 332 of the rotating buckle 33 is retained in the retaining slot 3411 of the cover plate 34, because the surface of the extending portion 3212 is higher than the surface of the sliding slot 3212a, so that the boss 3213 is retained in the wheel body 321 to move downwards, and together drive the rotating buckle 33 connected with the wheel body 321 to move downwards, and the cover plate 34 is pulled tightly by the clamping part 332 of the rotating buckle 33 to move towards the second supporting plate 20, so that the cover plate 34 presses the first workpiece and the second workpiece placed on the second supporting plate 20.

The compressing device 100 drives the linkage piece 31 to drive the compressing wheel 32 to rotate through the driving piece 35, so that the rotating buckle 33 connected to the compressing wheel 32 rotates together and tensions the cover plate 34, the cover plate 34 compresses the first workpiece and the second workpiece, and through the arrangement of the compressing wheels 32, multi-point compression is realized, the flatness of the compressed workpieces is guaranteed, manual compression is not needed, and the production efficiency is improved.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not to be taken as limiting the present application, and that suitable changes and modifications to the above embodiments are within the scope of the present disclosure as long as they are within the spirit and scope of the present application.

Claims

1. A pressing device for pressing a first workpiece against a second workpiece, comprising:

a first support plate;

the second supporting plate is laminated with the first supporting plate and used for bearing the first workpiece and the second workpiece, and a plurality of concave parts are arranged on the surface, opposite to the surface of the first supporting plate, of the second supporting plate;

its characterized in that, closing device still includes:

the linkage piece is positioned between the first supporting plate and the second supporting plate and is provided with a driving end and a pressing end;

the pressing wheel is positioned between the first supporting plate and the second supporting plate and arranged in the concave part, and is provided with a rotating shaft which is connected with a pressing end of the linkage piece;

the rotating buckle is movably connected to the central shaft of the pressing wheel and is used for penetrating through the second supporting plate, the first workpiece and the second workpiece;

the cover plate is used for pressing the first workpiece and the second workpiece, and comprises a clamping part which is used for clamping the rotating buckle; and

the driving piece is arranged on the first supporting plate and connected with the driving end of the linkage piece, and is used for driving the pressing end of the linkage piece to drive the pressing wheel to rotate and enable the rotary buckle to strain the cover plate, so that the cover plate presses the first workpiece and the second workpiece tightly.

2. The compression device of claim 1, wherein the compression wheel is provided with:

the boss is arranged in the concave part and is used for abutting against the compression wheel;

the sliding groove is arranged on the joint surface of the pressing wheel and the depressed part and used for enabling the boss to leave the sliding groove when the pressing wheel is rotated, so that the cover plate is tensioned by the rotary buckle.

3. The compression device of claim 2, wherein the compression wheel is further provided with:

the first elastic piece is arranged on the central shaft, abuts against the rotating buckle and is used for resetting the position of the rotating buckle; and

and the locking part is fixed on the pressing wheel and used for locking the position of the central shaft.

4. The pressing device as claimed in claim 1, wherein the pressing wheel further has a second elastic member, one end of the second elastic member is disposed in the first supporting plate, and the other end of the second elastic member abuts against the pressing wheel for resetting the position of the pressing wheel.

5. The compression device of claim 2, wherein the connection between the sliding groove and the surface of the compression wheel is provided with a slope structure to facilitate the boss to slide from the sliding groove to the surface of the compression wheel.

6. The pressing device as claimed in claim 5, wherein the linkage member has a mounting hole extending perpendicular to a length direction of the linkage member, and the rotating shaft is disposed at an outer periphery of the pressing wheel and located in the mounting hole, so that the linkage member drives the pressing wheel to rotate when moving.

7. The pressing device as claimed in claim 3, wherein said retaining portion has a retaining groove, and two opposite sides of said retaining groove are provided with protruding edges extending in the axial direction of said retaining portion for retaining said rotating buckle.

8. The compression device of claim 1, wherein the drive member comprises:

the eccentric wheel is rotatably connected with the driving end of the linkage piece;

the rotating shaft is connected with the eccentric wheel; and

and the rotating rod is connected with the rotating shaft so as to drive the eccentric wheel to rotate, so that the linkage part moves.

9. The compression device of claim 8, wherein the drive member further comprises:

the supporting piece is arranged on the first supporting plate;

and the limiting part is connected with the supporting part and is positioned on the rotating path of the rotating rod so as to limit the rotating position of the rotating rod.

10. The compression device of claim 7, wherein the swivel buckle comprises:

the connecting part is arranged in the central shaft, and one end of the connecting part abuts against the first elastic part; and

the clamping part is connected with the connecting part, arranged in the clamping groove and used for clamping the clamping part on the convex edge by rotating the connecting part.