Bidirectional stretching chain clip structure

Abstract

The utility model relates to the technical field of chain tongs, in particular to a two-way stretching chain tongs structure, which is convenient to adjust clamping force, improves practicability, is convenient to mount and dismount, and improves convenience. Comprising a chain clip mechanism, the chain clamp further comprises a clamping force mechanism, an adjusting mechanism, a mounting mechanism, a fixing mechanism and a secondary fixing mechanism, the clamping force mechanism is mounted on the chain clamp mechanism, the adjusting mechanism is mounted on the clamping force mechanism, the chain clamp mechanism is mounted on the mounting mechanism, the fixing mechanism is mounted on the mounting mechanism, and the secondary fixing mechanism is mounted on the fixing mechanism. A thin film is fixed through the chain clip mechanism, the clamping force mechanism provides elastic force for the chain clip mechanism, the adjusting mechanism facilitates adjustment of the clamping force mechanism, the mounting mechanism facilitates mounting of the chain clip mechanism, the fixing mechanism assists the mounting mechanism in mounting and fixing the chain clip mechanism, and the secondary fixing mechanism facilitates locking of the fixing mechanism.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chain tongs, particularly to a bidirectional stretching chain tong structure. BACKGROUND

[0002] Chain tongs are a kind of equipment accessories widely used in industrial production, especially in film stretching, printing and dyeing, and setting processes. Chain tongs are a kind of equipment accessories widely used in industrial production, especially in film stretching, printing and dyeing, and setting processes. The design of chain tongs enables them to firmly clamp materials, preventing sliding or falling during processing, thereby ensuring the quality and efficiency of production.

[0003] The existing chain tongs, such as the prior art with application number CN201320803131.4, include a tong body, a tong seat, a first bearing, a second bearing, a pin shaft, and a short shaft. The tong body and the tong seat are separate, making maintenance convenient and reducing costs. The first bearing and the second bearing are arranged on the upper and lower sides of the tong seat, ensuring accurate positioning and smooth operation of the chain tongs.

[0004] However, the existing technology is not convenient for adjusting the clamping force of the chain tongs, and the existing technology is not convenient for quickly installing and fixing the tong seat and the chain link seat, reducing convenience. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems, the utility model provides a bidirectional stretching chain tong structure that is convenient for adjusting the clamping force, improves practicality, and is easy to install and disassemble, improving convenience.

[0006] The bidirectional stretching chain tong structure of the utility model includes a chain tong mechanism, a clamping force mechanism, an adjusting mechanism, an installation mechanism, a fixing mechanism, and a secondary fixing mechanism. The clamping force mechanism is installed on the chain tong mechanism, the adjusting mechanism is installed on the clamping force mechanism, the chain tong mechanism is installed on the installation mechanism, the fixing mechanism is installed on the installation mechanism, the secondary fixing mechanism is installed on the fixing mechanism, the chain tong mechanism is used to fix the film, the clamping force mechanism provides elasticity for the chain tong mechanism, the adjusting mechanism is convenient for adjusting the clamping force mechanism, the installation mechanism is convenient for installing the chain tong mechanism, the fixing mechanism assists the installation mechanism in installing and fixing the chain tong mechanism, and the secondary fixing mechanism is convenient for locking the fixing mechanism. The chain tong mechanism is pushed by the clamping force mechanism to fix the film, the adjusting mechanism is convenient for adjusting the clamping force mechanism, the clamping force of the chain tong mechanism in fixing the film is adjusted, practicality is improved, the installation mechanism is convenient for installing the chain tong mechanism, the fixing mechanism assists the installation mechanism in installing and fixing the chain tong mechanism, convenience is improved, the secondary fixing mechanism is convenient for locking the fixing mechanism, and practicality is improved.

[0007] Preferably, the chain tongs mechanism comprises a base plate, a tongs body, a tongs handle, a fixing head and a fixing base plate, the tongs body is installed on the base plate, the middle part of the tongs handle is rotatably installed on the tongs body, the fixing head is installed at the bottom end of the tongs handle, and the fixing base plate is installed on the base plate; the tongs handle is rotated on the tongs body by external force, thereby driving the fixing head and the fixing base plate to clamp and fix the film.

[0008] Preferably, the clamping force mechanism comprises a connecting seat, a sliding box, a sliding rod, a sliding top plate and a first spring, the connecting seat is installed on the tongs handle, one end of the sliding box is rotatably installed on the inner wall of the tongs body, the sliding rod is slidably installed in the sliding box, the other end of the sliding rod is rotatably installed on the connecting seat, the sliding top plate is slidably installed in the sliding box, and the first spring connects the sliding top plate and the sliding rod; the tongs handle is rotated on the tongs body by external force, thereby making the sliding rod slide in the sliding box, and then the tongs handle is elastically pushed by the first spring to provide clamping force for the fixing head and the fixing base plate to clamp and fix the film.

[0009] Preferably, the adjusting mechanism comprises an adjusting box, a lead screw and a sliding adjusting block, the adjusting box is installed on the sliding box, the adjusting box is communicated with the sliding box through a sliding groove, the lead screw is rotatably installed in the adjusting box, and the sliding adjusting block is slidably installed in the adjusting box; the sliding adjusting block is driven to slide in the adjusting box by rotating the lead screw due to the threaded relationship, thereby driving the sliding top plate to slide in the sliding box, so as to adjust the clamping force provided by the first spring and improve the practicability.

[0010] Preferably, the mounting mechanism comprises a chain seat and an auxiliary fixing plate, the auxiliary fixing plate is installed on the chain seat, the auxiliary fixing plate and the chain seat enclose a fixing groove, and the base plate can be installed in the fixing groove of the chain seat and the auxiliary fixing plate; the fixing groove enclosed by the auxiliary fixing plate and the chain seat facilitates the installation and fixation of the base plate, thereby improving the stability of the installation and fixation of the base plate.

[0011] Preferably, the fixing mechanism comprises a limiting groove, a through groove, a guide groove, a rotating ring groove, a lock rod and a lock plate, the limiting groove is arranged on the auxiliary fixing plate, the through grooves are arranged on the base plate, the chain seat and the auxiliary fixing plate, the guide groove is installed on the inner wall of the through groove, the rotating ring groove is installed in the chain seat and communicated with the through groove, the lock rod can be installed in the through groove, and the lock plate is installed on one end of the lock rod; when the base plate, the chain seat and the auxiliary fixing plate are to be fixed, the base plate is installed in the fixing groove between the chain seat and the auxiliary fixing plate, at this time, the through grooves of the base plate, the chain seat and the auxiliary fixing plate are aligned, then the lock plate is aligned with the guide groove, the lock rod is inserted into the through groove, until the lock plate enters the rotating ring groove, the lock rod is rotated, so that the lock plate is clamped in the rotating ring groove, thereby completing the fixation of the base plate and improving the convenience.

[0012] Preferably, the secondary fixing mechanism comprises a lock slot, a sliding sleeve box, a sliding lock block, a pull rod and a second spring, the lock slot is installed on the auxiliary fixing plate, the lock slot is located in the limiting groove, the sliding sleeve box is installed on the lock rod, the sliding lock block is slidingly installed in the sliding sleeve box, the pull rod is installed at the top of the sliding lock block, the pull rod is slidingly installed on the sliding sleeve box, and the second spring is connected between the top of the inner wall of the sliding sleeve box and the sliding lock block; when the bottom plate, the chain seat and the auxiliary fixing plate are to be fixed, the bottom plate is installed in the fixing groove between the chain seat and the auxiliary fixing plate, the through slots of the bottom plate, the chain seat and the auxiliary fixing plate are aligned at this time, then the lock plate is aligned with the guide groove, the lock rod is inserted into the through slot, the lock plate enters the rotating ring groove, the lock rod is rotated, the sliding lock block is aligned with the lock slot, the sliding lock block is pushed to slide in the sliding sleeve box through the elasticity of the second spring, the sliding lock block is pushed into the lock slot, the rotation of the lock rod is prevented, the lock plate is clamped in the rotating ring groove, the fixing of the bottom plate is completed, and convenience is improved; when the bottom plate is to be disassembled, the pull rod is pulled, the sliding lock block is slid in the sliding sleeve box, the sliding sleeve box is pulled out of the lock slot, then the lock rod is rotated, the lock plate is aligned with the guide groove, and the lock rod can be taken out.

[0013] Compared with the prior art, the utility model has the advantages that the clamping force mechanism drives the chain tongs mechanism to fix the film, the adjusting mechanism is convenient for adjusting the clamping force mechanism, the chain tongs mechanism adjusts the clamping force of the film, practicality is improved, the installing mechanism is convenient for installing the chain tongs mechanism, the fixing mechanism assists the installing mechanism to install and fix the chain tongs mechanism, convenience is improved, the secondary fixing mechanism is convenient for locking the fixing mechanism, and practicality is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the first axonometric structure schematic diagram of the utility model;

[0015] Figure 2 It is the second axonometric structure schematic diagram of the utility model;

[0016] Figure 3 It is the third axonometric structure schematic diagram of the utility model;

[0017] Figure 4 It is the fourth axonometric structure schematic diagram of the utility model;

[0018] Figure 5 It is the front view cross section structure schematic diagram of the utility model;

[0019] Figure 6 It is the overhead cross section axonometric structure schematic diagram of the utility model;

[0020] Figure 7 It is the side view cross section axonometric structure schematic diagram of the utility model;

[0021] Figure 8 is the utility model Figure 5 the enlarged structural schematic view of A place in the middle;

[0022] Figure 9 is the utility model Figure 6 the enlarged structural schematic view of B place in the middle;

[0023] Figure 10 is the utility model Figure 7 the enlarged structural schematic view of C place in the middle;

[0024] Marked in the drawing: 01, chain tongs mechanism;11, bottom plate;12, tongs body;13, tongs handle;14, fixed head;15, fixed bottom plate;02, clamping force mechanism;21, connecting seat;22, sliding box;23, sliding rod;24, sliding top plate;25, first spring;03, adjusting mechanism;31, adjusting box;32, screw;33, sliding adjusting block;04, mounting mechanism;41, chain seat;42, auxiliary fixed plate;05, fixed mechanism;51, limiting groove;52, through slot;53, guide slot;54, rotating ring slot;55, lock rod;56, lock plate;06, secondary fixed mechanism;61, lock slot;62, sliding sleeve box;63, sliding lock block;64, pull rod;65, second spring. DETAILED DESCRIPTION

[0025] In order to facilitate understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0026] Embodiment 1

[0027] As Figures 1 to 8 shown, a bidirectional stretching chain tongs structure, including chain tongs mechanism 01, still including clamping force mechanism 02, adjusting mechanism 03, mounting mechanism 04, fixed mechanism 05 and secondary fixed mechanism 06, clamping force mechanism 02 is installed on chain tongs mechanism 01, adjusting mechanism 03 is installed on clamping force mechanism 02, chain tongs mechanism 01 is installed on mounting mechanism 04, fixed mechanism 05 is installed on mounting mechanism 04, secondary fixed mechanism 06 is installed on fixed mechanism 05;

[0028] Through chain tongs mechanism 01, the film is fixed, clamping force mechanism 02 provides elastic force for chain tongs mechanism 01, adjusting mechanism 03 is convenient for adjusting clamping force mechanism 02, mounting mechanism 04 is convenient for installing chain tongs mechanism 01, fixed mechanism 05 assists mounting mechanism 04 to install and fix chain tongs mechanism 01, secondary fixed mechanism 06 is convenient for locking fixed mechanism 05;

[0029] The chain tongs mechanism 01 comprises a bottom plate 11, a tongs body 12, a tongs handle 13, a fixed head 14 and a fixed bottom plate 15, the tongs body 12 is installed on the bottom plate 11, the middle part of the tongs handle 13 is rotatably installed on the tongs body 12, the fixed head 14 is installed at the bottom end of the tongs handle 13, and the fixed bottom plate 15 is installed on the bottom plate 11;

[0030] The clamping force mechanism 02 comprises a connecting seat 21, a sliding box 22, a sliding rod 23, a sliding top plate 24 and a first spring 25, the connecting seat 21 is installed on the tongs handle 13, one end of the sliding box 22 is rotatably installed on the inner wall of the tongs body 12, the sliding rod 23 is slidably installed in the sliding box 22, the other end of the sliding rod 23 is rotatably installed on the connecting seat 21, the sliding top plate 24 is slidably installed in the sliding box 22, and the first spring 25 connects the sliding top plate 24 and the sliding rod 23;

[0031] The adjusting mechanism 03 comprises an adjusting box 31, a lead screw 32 and a sliding adjusting block 33, the adjusting box 31 is installed on the sliding box 22, the adjusting box 31 is communicated with the sliding box 22 through a sliding groove, the lead screw 32 is rotatably installed in the adjusting box 31, and the sliding adjusting block 33 is slidably installed in the adjusting box 31 and threadedly matched with the lead screw 32; the sliding adjusting block 33 is connected with the sliding top plate 24;

[0032] By means of external force, the tongs handle 13 is actuated to rotate on the tongs body 12, so that the sliding rod 23 slides in the sliding box 22, and then the tongs handle 13 is elastically pushed by the first spring 25 to provide clamping force for the fixed head 14 and the fixed bottom plate 15 to clamp and fix the film, and then the clamping and fixing of the film are completed by the fixed head 14 and the fixed bottom plate 15; by rotating the lead screw 32, the sliding adjusting block 33 is driven to slide in the adjusting box 31 due to the threaded relationship, and then the sliding top plate 24 is driven to slide in the sliding box 22, so that the clamping force provided by the first spring 25 is adjusted, and the practicability is improved.

[0033] Embodiment 2

[0034] As shown in Figure 3 , Figure 4 , Figure 9 and Figure 10 , a bidirectional stretching chain tongs structure comprises a chain tongs mechanism 01, and further comprises a clamping force mechanism 02, an adjusting mechanism 03, a mounting mechanism 04, a fixing mechanism 05 and a secondary fixing mechanism 06, the clamping force mechanism 02 is installed on the chain tongs mechanism 01, the adjusting mechanism 03 is installed on the clamping force mechanism 02, the chain tongs mechanism 01 is installed on the mounting mechanism 04, the fixing mechanism 05 is installed on the mounting mechanism 04, and the secondary fixing mechanism 06 is installed on the fixing mechanism 05;

[0035] The film is fixed by the chain pincers mechanism 01, the clamping force mechanism 02 provides elastic force for the chain pincers mechanism 01, the adjusting mechanism 03 is convenient for adjusting the clamping force mechanism 02, the mounting mechanism 04 is convenient for mounting the chain pincers mechanism 01, the fixing mechanism 05 assists the mounting mechanism 04 in mounting and fixing the chain pincers mechanism 01, and the secondary fixing mechanism 06 is convenient for locking the fixing mechanism 05;

[0036] The chain pincers mechanism 01 comprises a bottom plate 11, a pincers body 12, a pincers handle 13, a fixing head 14 and a fixing bottom plate 15, the pincers body 12 is mounted on the bottom plate 11, the middle part of the pincers handle 13 is rotatably mounted on the pincers body 12 through a rotating shaft, the fixing head 14 is mounted at the bottom end of the pincers handle 13, and the fixing bottom plate 15 is mounted on the bottom plate 11;

[0037] The mounting mechanism 04 comprises a chain seat 41 and an auxiliary fixing plate 42, the auxiliary fixing plate 42 is mounted on the chain seat 41, the auxiliary fixing plate 42 and the chain seat 41 enclose a fixing groove, and the bottom plate 11 can be mounted in the fixing groove of the chain seat 41 and the auxiliary fixing plate 42;

[0038] The fixing mechanism 05 comprises a limiting groove 51, a through groove 52, a guide groove 53, a rotating ring groove 54, a lock rod 55 and a lock plate 56, the limiting groove 51 is arranged on the auxiliary fixing plate 42, the through groove 52 is arranged on the bottom plate 11, the chain seat 41 and the auxiliary fixing plate 42, the guide groove 53 is mounted on the inner wall of the through groove 52, the rotating ring groove 54 is mounted in the chain seat 41 and communicates with the through groove 52, the lock rod 55 can be mounted in the through groove 52, and the lock plate 56 is mounted at one end of the lock rod 55;

[0039] The secondary fixing mechanism 06 comprises a lock groove 61, a sliding sleeve box 62, a sliding lock block 63, a pull rod 64 and a second spring 65, the lock groove 61 is mounted on the auxiliary fixing plate 42 and located in the limiting groove 51, the sliding sleeve box 62 is mounted on the lock rod 55, the sliding lock block 63 is slidingly mounted in the sliding sleeve box 62, the pull rod 64 is mounted at the top end of the sliding lock block 63 and slidingly mounted on the sliding sleeve box 62, and the second spring 65 is connected between the top end of the inner wall of the sliding sleeve box 62 and the sliding lock block 63;

[0040] The fixing groove surrounded by the auxiliary fixing plate 42 and the chain seat 41 facilitates the installation and fixation of the bottom plate 11, improves the stability of the installation and fixation of the bottom plate 11, when the bottom plate 11 is to be fixed with the chain seat 41 and the auxiliary fixing plate 42, the bottom plate 11 is installed in the fixing groove between the chain seat 41 and the auxiliary fixing plate 42, at this time, the through slot 52 of the bottom plate 11, the chain seat 41 and the auxiliary fixing plate 42 are aligned, then the lock plate 56 is aligned with the guide slot 53, the lock rod 55 is inserted into the through slot 52, until the lock plate 56 enters into the rotating ring slot 54, the lock rod 55 is rotated, so that the sliding lock block 63 is aligned with the lock slot 61, the sliding lock block 63 is slid in the sliding sleeve box 62 by the elastic pushing of the second spring 65, and then the sliding lock block 63 is pushed into the lock slot 61, and then the rotation of the lock rod 55 is prevented, so that the lock plate 56 is clamped in the rotating ring slot 54, and the fixation of the bottom plate 11 is completed, and the convenience is improved, when the bottom plate 11 is to be disassembled, the pull rod 64 is pulled, so that the sliding lock block 63 slides in the sliding sleeve box 62, until the sliding sleeve box 62 is pulled out of the lock slot 61, then the lock rod 55 is rotated, so that the lock plate 56 is aligned with the guide slot 53, and the lock rod 55 is taken out.

[0041] As Figures 1 to 10As shown, the utility model discloses a kind of two-way stretching chain nippers structure, when working, by external force, nipper handle 13 is stirred, so that nipper handle 13 is rotated on nipper body 12, in turn sliding rod 23 is slid in sliding box 22, in turn by the elastic pushing nipper handle 13 of first spring 25 provides the clamping force of fixed head 14 and fixed bottom plate 15 to film, in turn by fixed head 14 and fixed bottom plate 15 complete to film clamping fixation, by rotating screw 32, sliding adjusting block 33 is slid in adjusting box 31 due to threaded relationship, in turn sliding top plate 24 is slid in sliding box 22, so that the clamping force provided by first spring 25 is adjusted, improve practicability, the fixed groove surrounded by auxiliary fixed plate 42 and chain seat 41 is convenient for installing and fixing bottom plate 11, improve the stability of bottom plate 11 installation fixation, when bottom plate 11 and chain seat 41 and auxiliary fixed plate 42 are fixed, bottom plate 11 is installed in the fixed groove between chain seat 41 and auxiliary fixed plate 42, at this time, the slot 52 of bottom plate 11, chain seat 41 and auxiliary fixed plate 42 is aligned, then lock plate 56 is aligned with guide slot 53, lock rod 55 is inserted into slot 52, until lock plate 56 enters into rotating ring groove 54, rotating lock rod 55, so that sliding lock block 63 is aligned with lock slot 61, by the elastic pushing sliding lock block 63 in sliding sleeve box 62 of second spring 65, in turn sliding lock block 63 is pushed into lock slot 61, in turn prevent lock rod 55 from rotating, so that lock plate 56 is clamped in rotating ring groove 54, in turn complete the fixation of bottom plate 11, improve convenience, when bottom plate 11 is disassembled, pull rod 64, so that sliding lock block 63 is slid in sliding sleeve box 62, until sliding sleeve box 62 is pulled out from lock slot 61, then rotating lock rod 55, so that lock plate 56 is aligned with guide slot 53, and lock rod 55 can be taken out.

[0042] The main function realized by the utility model is: in the working process of chain nipper, the clamping force is adjusted, the practicability is improved, and installation and disassembly are facilitated, and the convenience is improved.

[0043] The above is only preferred embodiment of the utility model, it should be pointed out, for ordinary skilled person in the prior art, on the premise of not departing from the technical principle of the utility model, can make a number of improvements and variations, these improvements and variations also should be regarded as the protection scope of the utility model.

Claims

1. A bidirectional stretch pincer structure comprising a pincer mechanism (01); characterized in that, It also includes clamping force mechanism (02), adjusting mechanism (03), installation mechanism (04), fixed mechanism (05) and secondary fixed mechanism (06), clamping force mechanism (02) is installed on chain tongs mechanism (01), adjusting mechanism (03) is installed on clamping force mechanism (02), chain tongs mechanism (01) is installed on installation mechanism (04), fixed mechanism (05) is installed on installation mechanism (04), secondary fixed mechanism (06) is installed on fixed mechanism (05); The chain tongs mechanism (01) fixes the film, the clamping force mechanism (02) provides elastic force for the chain tongs mechanism (01), the adjusting mechanism (03) is convenient for adjusting the clamping force mechanism (02), the installation mechanism (04) is convenient for installing the chain tongs mechanism (01), the fixed mechanism (05) assists the installation mechanism (04) to install and fix the chain tongs mechanism (01), and the secondary fixed mechanism (06) is convenient for locking the fixed mechanism (05).

2. A two-way stretch chain link structure as defined in claim 1, wherein, The chain tongs mechanism (01) includes a bottom plate (11), a tongs body (12), a tongs handle (13), a fixed head (14) and a fixed bottom plate (15), the tongs body (12) is installed on the bottom plate (11), the middle part of the tongs handle (13) is rotatably installed on the tongs body (12) through a rotating shaft, the fixed head (14) is installed at the bottom end of the tongs handle (13), and the fixed bottom plate (15) is installed on the bottom plate (11).

3. A two-way stretch chain link structure as defined in claim 2, wherein, The clamping force mechanism (02) includes a connecting seat (21), a sliding box (22), a sliding rod (23), a sliding top plate (24) and a first spring (25), the connecting seat (21) is installed on the tongs handle (13), one end of the sliding box (22) is rotatably installed on the inner wall of the tongs body (12), the sliding rod (23) is slidably installed in the sliding box (22), the other end of the sliding rod (23) is rotatably installed on the connecting seat (21), the sliding top plate (24) is slidably installed in the sliding box (22), and the first spring (25) is connected between the sliding top plate (24) and the sliding rod (23).

4. A two-way stretch chain link structure as defined in claim 3, wherein, The adjusting mechanism (03) includes an adjusting box (31), a lead screw (32) and a sliding adjusting block (33), the adjusting box (31) is installed on the sliding box (22), the adjusting box (31) is communicated with the sliding box (22) through a sliding groove, the lead screw (32) is rotatably installed in the adjusting box (31), the sliding adjusting block (33) is slidably installed in the adjusting box (31), the sliding adjusting block (33) is threadedly connected with the lead screw (32), and the sliding adjusting block (33) is connected with the sliding top plate (24).

5. A two-way stretch chain link structure as defined in claim 2, wherein, The installation mechanism (04) includes a chain seat (41) and an auxiliary fixed plate (42), the auxiliary fixed plate (42) is installed on the chain seat (41), the auxiliary fixed plate (42) and the chain seat (41) form a fixed groove, and the bottom plate (11) can be installed in the fixed groove of the chain seat (41) and the auxiliary fixed plate (42).

6. A two-way stretch chain link structure as defined in claim 5, wherein, The fixing mechanism (05) comprises a limiting groove (51), a through groove (52), a guide groove (53), a rotating ring groove (54), a lock rod (55) and a lock plate (56), the limiting groove (51) is arranged on the auxiliary fixing plate (42), the through groove (52) is arranged on the bottom plate (11), the chain seat (41) and the auxiliary fixing plate (42), the guide groove (53) is installed on the inner wall of the through groove (52), the rotating ring groove (54) is installed in the chain seat (41), the rotating ring groove (54) is communicated with the through groove (52), the lock rod (55) is installed in the through groove (52), and the lock plate (56) is installed at one end of the lock rod (55).

7. A two-way stretch chain link structure as defined in claim 6, wherein, The secondary fixing mechanism (06) comprises a lock groove (61), a sliding sleeve box (62), a sliding lock block (63), a pull rod (64) and a second spring (65), the lock groove (61) is installed on the auxiliary fixing plate (42), the lock groove (61) is located in the limiting groove (51), the sliding sleeve box (62) is installed on the lock rod (55), the sliding lock block (63) is slidingly installed in the sliding sleeve box (62), the pull rod (64) is installed at the top end of the sliding lock block (63), the pull rod (64) is slidingly installed on the sliding sleeve box (62), and the second spring (65) is connected between the top end of the inner wall of the sliding sleeve box (62) and the sliding lock block (63).

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