Full-automatic automobile air conditioner pipeline forming equipment

Abstract

The utility model relates to the technical field of automobiles, and discloses full-automatic automobile air conditioner pipeline forming equipment which comprises a rack and a clamping assembly, a first limiting assembly, a first fixing block and a third limiting assembly are fixedly installed on the face, close to the clamping assembly, of the rack, and a second fixing block is fixedly installed on the face, away from the first fixing block, of the rack. And an insertion block I is fixedly mounted on the outer side of the fixed block II. According to the full-automatic automobile air conditioner pipeline forming equipment, through cooperation of a clamping assembly, a first limiting assembly and a third limiting assembly, when an air conditioner pipeline is bent, the air conditioner pipeline is not prone to shaking and high in stability, the bending precision is also improved, through cooperation of a second fixing block and a groove and cooperation of a first inserting block and a first inserting groove, rapid positioning of a bending disc can be achieved, and the working efficiency is improved. And through cooperation of the first positioning rod, the first positioning groove and the bolt and cooperation of the second threaded hole and the first threaded hole, rapid locking of the bending disc can be achieved, and when the bending disc is used or assembled, rapid disassembly and assembly of the bending disc are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, and particularly relates to a fully automatic forming device for automobile air-conditioning pipelines. Background Technique

[0002] An automobile air conditioner is an air conditioning system installed in a vehicle, and its main functions include refrigeration, heating, ventilation and air purification. Its core goal is to optimize the environmental parameters in the carriage, so as to improve the driving and riding comfort and reduce fatigue. The automobile air-conditioning pipeline refers to the pipeline system in the automobile air-conditioning system, which is responsible for connecting the various components of the automobile air conditioner to achieve orderly operation. The design of the air-conditioning pipeline assembly is related to the performance of the air-conditioning system. Because the component assemblies of the automobile air conditioner are generally scattered and installed in various parts of the automobile, pipelines are needed to connect these component assemblies to form a complete air-conditioning system.

[0003] Chinese Utility Model Patent Publication No.: CN210208203, discloses: a fully automatic forming device for automobile air-conditioning pipelines. This fully automatic forming device for automobile air-conditioning pipelines realizes the fully automatic process of forming automobile air-conditioning pipelines through the mutual cooperation of a loading and unloading manipulator and a forming device. However, this fully automatic forming device for automobile air-conditioning pipelines only clamps the air-conditioning pipeline through a single clamping component. When the air-conditioning pipeline is bent, it is easy to shake, with poor stability and low bending accuracy. Moreover, the installation structure of the bending disc is not designed, and it is not convenient for the quick disassembly and assembly of the bending disc during use or assembly, with poor practicability and not being convenient for popularization and use. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a fully automatic forming device for automobile air-conditioning pipelines, which can effectively solve the problems in the prior art that only a single clamping component is used to clamp the air-conditioning pipeline, and when the air-conditioning pipeline is bent, it is easy to shake, with poor stability and low bending accuracy, and the installation structure of the bending disc is not designed, and it is not convenient for the quick disassembly and assembly of the bending disc during use or assembly, with poor practicability and not being convenient for popularization and use.

[0005] The technical solution adopted by the present utility model is: a fully automatic forming device for automobile air-conditioning pipes, including a frame and a clamping assembly. On one side of the frame close to the clamping assembly, a first limiting assembly, a first fixing block and a third limiting assembly are fixedly installed. On the side of the first fixing block away from it, a second fixing block is fixedly installed. On the outer side of the second fixing block, a first inserting block is fixedly installed. At one end of the second fixing block away from the frame, a first threaded hole is opened. On the side of the first fixing block away from it, a bending disc is arranged. On the side of the bending disc away from the first fixing block, a groove, a first inserting slot and a first positioning slot are opened. On the side of the bending disc away from the first fixing block, a locking cover is arranged. On the side of the locking cover close to the bending disc, a first positioning rod is fixedly installed. On the side of the locking cover away from the bending disc, a second threaded hole is opened. On the side of the locking cover away from the bending disc, a bolt adapted to the second threaded hole and the first threaded hole is threadedly connected. At one end of the frame away from the clamping assembly, a rotating assembly is arranged. On the outer side of the rotating assembly, a second limiting assembly is fixedly installed.

[0006] Preferably, the first limiting assembly includes a fixing plate, a second positioning slot, a second inserting slot, a first stop block, a second positioning rod, a limiting slot, a limiting sleeve, a limiting block and an inserting rod. At one end of the fixing plate away from the frame, a second positioning slot and a second inserting slot are opened. On the outer side of the fixing plate, a first stop block is arranged. At one end of the first stop block close to the fixing plate, a second positioning rod is fixedly installed. At one end of the second positioning rod close to the fixing plate, a limiting slot is opened. On the side of the fixing plate away from the first stop block, a limiting sleeve is arranged. On the inner side of the limiting sleeve, a limiting block is fixedly installed. On the side of the limiting sleeve close to the fixing plate, an inserting rod is fixedly installed. The second positioning rod is installed by insertion into the second positioning slot, and the cross section of the second positioning rod is in a "T" shape structure.

[0007] Through the above technical solution, the staff inserts the second positioning rod into the second positioning slot, and the rapid positioning of the first stop block can be realized.

[0008] Preferably, the limiting block is installed by insertion into the limiting slot, and the inserting rod is installed by insertion into the second inserting slot.

[0009] Through the above technical solution, after the rapid positioning of the first stop block, the staff inserts the limiting block into the limiting slot and inserts the inserting rod into the second inserting slot at the same time, and the rapid installation of the first stop block can be realized. After long-term use, it is convenient to repair or replace it.

[0010] Preferably, the first limiting assembly and the third limiting assembly together form a clamping mechanism, and the clamping centers of the clamping assembly and the clamping mechanism are on the same horizontal line.

[0011] Through the above technical solution, through the cooperation of the clamping assembly, the first limiting assembly and the third limiting assembly, when the air-conditioning pipe is bent, it is not easy to shake, has high stability, and also improves the bending accuracy.

[0012] Preferably, the second fixing block and the groove are installed by plugging, and the first inserting block and the first slot are installed by plugging.

[0013] Through the above technical solution, the staff inserts the second fixing block into the inside of the groove, and at the same time inserts the first inserting block into the inside of the first slot, so as to realize the rapid positioning of the bending disc.

[0014] Preferably, the first positioning rod and the first positioning groove are installed by plugging, and the bolt penetrates through the second threaded hole and extends into the inside of the first threaded hole.

[0015] Through the above technical solution, after the bending disc is quickly positioned, the staff inserts the first positioning rod into the inside of the first positioning groove, and then penetrates the bolt through the second threaded hole and extends into the inside of the first threaded hole, so as to realize the rapid locking of the bending disc, which is convenient for the rapid disassembly and assembly of the bending disc during use or assembly.

[0016] Preferably, the rotating assembly includes an installation groove, a motor and a rotating plate. The motor is fixedly installed inside the installation groove, and the output end of the motor is fixedly installed with a rotating plate;

[0017] The second limiting assembly includes a mounting seat, a cylinder, a mounting block, a guiding groove, a first through hole, a second stop block, a guiding block, a second through hole and a limiting rod. A cylinder is fixedly installed on one side of the mounting seat away from the bending disc. The movable end of the cylinder is fixedly installed with a mounting block. A guiding groove and a first through hole are formed on the outer side of the mounting block. A second stop block is arranged on the side of the mounting block away from the cylinder. A guiding block is fixedly installed on the side of the second stop block close to the mounting block. A second through hole is formed on the outer side of the guiding block. A limiting rod adapted to the first through hole and the second through hole is inserted and installed on the outer side of the mounting seat. The second limiting assembly and the third limiting assembly have the same structure. The bending disc, the rotating assembly and the second limiting assembly form a bending mechanism. The guiding block and the guiding groove are installed by plugging, and the limiting rod penetrates through the first through hole and the second through hole.

[0018] Through the above technical solution, the staff inserts the guiding block into the inside of the guiding groove, and then penetrates the limiting rod through the first through hole and the second through hole, so as to realize the rapid installation of the second stop block. After long-term use, it is convenient to repair or replace it. Through the cooperation of the bending disc, the rotating assembly and the second limiting assembly, after the air-conditioning pipe is clamped, the staff first starts the cylinder, so that the second stop block abuts against the bending disc, and the air-conditioning pipe is limited between the two. Then the motor is started, and the output shaft of the motor rotates to drive the rotating plate to rotate, thereby driving the second stop block to rotate, so as to realize the rapid bending of the air-conditioning pipe and complete the forming work of the air-conditioning pipe, which has high practicability.

[0019] Compared with the prior art, the utility model provides a full-automatic forming device for automobile air-conditioning pipes, which has the following beneficial effects:

[0020] 1. The fully automatic forming equipment for automobile air-conditioning pipelines, through the cooperation of the clamping component, the first limiting component and the third limiting component, makes the air-conditioning pipeline not easy to shake during bending, has high stability, and also improves the bending accuracy. Through the cooperation of the second fixing block and the groove and the first inserting block and the first slot, the quick positioning of the bending disc can be realized. Through the cooperation of the first positioning rod and the first positioning slot, the bolt, the second threaded hole and the first threaded hole, the quick locking of the bending disc can be realized, which is convenient for the quick disassembly and assembly of the bending disc during use or assembly.

[0021] 2. The fully automatic forming equipment for automobile air-conditioning pipelines, through the cooperation of the second positioning rod and the second positioning slot, can realize the quick positioning of the first stop block. Through the cooperation of the limiting block and the limiting slot and the inserting rod and the second slot, the quick installation of the first stop block can be realized. After long-term use, it is convenient to repair or replace it. Through the cooperation of the guiding block and the guiding slot, the limiting rod, the first through hole and the second through hole, the quick installation of the second stop block can be realized. After long-term use, it is convenient to repair or replace it. Through the cooperation of the bending disc, the rotating component and the second limiting component, the quick bending of the air-conditioning pipeline can be realized, and the forming work of the air-conditioning pipeline can be completed, with high practicability. Description of the Drawings

[0022] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0023] Figure 2 is an installation structural schematic diagram of the first limiting component of the present utility model;

[0024] Figure 3 is of the present utility model Figure 2 is an enlarged structural schematic diagram of part A in;

[0025] Figure 4 is an installation structural schematic diagram of the rotating component of the present utility model;

[0026] Figure 5 is an installation structural schematic diagram of the second limiting component of the present utility model;

[0027] Figure 6 is an installation structural schematic diagram of the bending disc of the present utility model.

[0028] Wherein: 1. Frame; 2. Clamping assembly; 3. First limiting assembly; 301. Fixed plate; 302. Second positioning groove; 303. Second slot; 304. First stop block; 305. Second positioning rod; 306. Limiting groove; 307. Limiting sleeve; 308. Limiting block; 309. Insert rod; 4. First fixed block; 5. Second fixed block; 6. First insert block; 7. First threaded hole; 8. Bent plate; 9. Groove; 10. First slot; 11. First positioning groove; 12. Locking cover; 13. First positioning rod; 14. Second threaded hole; 15. Bolt; 16. Rotating assembly; 1601. Installation groove; 1602. Motor; 1603. Rotating plate; 17. Second limiting assembly; 1701. Mounting seat; 1702. Cylinder; 1703. Mounting block; 1704. Guide groove; 1705. First through hole; 1706. Second stop block; 1707. Guide block; 1708. Second through hole; 1709. Limiting rod; 18. Third limiting assembly. Detailed implementation mode

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1: As Figures 1-6 shown, a full-automatic forming device for automobile air-conditioning pipes provided by the present invention includes a frame 1 and a clamping assembly 2. A first limiting assembly 3, a first fixed block 4 and a third limiting assembly 18 are fixedly installed on one side of the frame 1 close to the clamping assembly 2. A second fixed block 5 is fixedly installed on the side of the first fixed block 4 away from it. A first insert block 6 is fixedly installed on the outside of the second fixed block 5. A first threaded hole 7 is opened at one end of the second fixed block 5 away from the frame 1. A bent plate 8 is arranged on the side of the first fixed block 4 away from it. A groove 9, a first slot 10 and a first positioning groove 11 are opened on the side of the bent plate 8 away from the first fixed block 4. A locking cover 12 is arranged on the side of the bent plate 8 away from the first fixed block 4. A first positioning rod 13 is fixedly installed on the side of the locking cover 12 close to the bent plate 8. A second threaded hole 14 is opened on the side of the locking cover 12 away from the bent plate 8. A bolt 15 adapted to the second threaded hole 14 and the first threaded hole 7 is threadedly connected to the side of the locking cover 12 away from the bent plate 8. A rotating assembly 16 is arranged at one end of the frame 1 away from the clamping assembly 2. A second limiting assembly 17 is fixedly installed on the outside of the rotating assembly 16.

[0031] Specifically, the first limiting component 3 includes a fixing plate 301, a second positioning groove 302, a second slot 303, a first stop block 304, a second positioning rod 305, a limiting groove 306, a limiting sleeve 307, a limiting block 308 and a plug rod 309. A second positioning groove 302 and a second slot 303 are formed at one end of the fixing plate 301 away from the machine frame 1. A first stop block 304 is arranged on the outer side of the fixing plate 301. A second positioning rod 305 is fixedly installed at one end of the first stop block 304 close to the fixing plate 301. A limiting groove 306 is formed at one end of the second positioning rod 305 close to the fixing plate 301. A limiting sleeve 307 is arranged on one side of the fixing plate 301 away from the first stop block 304. A limiting block 308 is fixedly installed inside the limiting sleeve 307. A plug rod 309 is fixedly installed on one side of the limiting sleeve 307 close to the fixing plate 301. The second positioning rod 305 is inserted and installed in the second positioning groove 302, and the cross section of the second positioning rod 305 is in a "T" shape. The advantage is that the operator inserts the second positioning rod 305 into the second positioning groove 302, and the quick positioning of the first stop block 304 can be realized.

[0032] Specifically, the limiting block 308 is inserted and installed in the limiting groove 306, and the plug rod 309 is inserted and installed in the second slot 303. The advantage is that after the quick positioning of the first stop block 304, the operator inserts the limiting block 308 into the limiting groove 306 and inserts the plug rod 309 into the second slot 303 at the same time, and the quick installation of the first stop block 304 can be realized. After long-term use, it is convenient to overhaul or replace it.

[0033] Specifically, the first limiting component 3 and the third limiting component 18 together form a clamping mechanism, and the clamping centers of the clamping component 2 and the clamping mechanism are on the same horizontal line. The advantage is that through the cooperation of the clamping component 2, the first limiting component 3 and the third limiting component 18, when the air-conditioning duct is bent, it is not easy to shake, the stability is high, and the bending accuracy is also improved.

[0034] Embodiment 2: As Figures 2-6 shown, as an improvement to the previous embodiment, in order to further facilitate the installation of the bending disc 8, specifically, the second fixing block 5 is inserted and installed in the groove 9, and the first plug block 6 is inserted and installed in the first slot 10. The advantage is that the operator inserts the second fixing block 5 into the groove 9 and inserts the first plug block 6 into the first slot 10 at the same time, and the quick positioning of the bending disc 8 can be realized.

[0035] Specifically, the first positioning rod 13 is inserted and installed in the first positioning groove 11, and the bolt 15 passes through the second threaded hole 14 and extends into the first threaded hole 7. The advantage is that after the quick positioning of the bending disc 8, the operator inserts the first positioning rod 13 into the first positioning groove 11, and then passes the bolt 15 through the second threaded hole 14 and extends into the first threaded hole 7, and the quick locking of the bending disc 8 can be realized. During use or assembly, it is convenient for the quick disassembly and assembly of the bending disc 8.

[0036] Specifically, the rotating assembly 16 includes a mounting slot 1601, a motor 1602 and a rotating plate 1603. The motor 1602 is fixedly mounted inside the mounting slot 1601, and the rotating plate 1603 is fixedly mounted on the output end of the motor 1602.

[0037] The limiting component 2 17 includes a mounting seat 1701, a cylinder 1702, a mounting block 1703, a guide groove 1704, a through hole 1705, a stopper 1706, a guide block 1707, a through hole 1708 and a limiting rod 1709. The mounting seat 1701 is fixedly mounted with the cylinder 1702 on the side away from the bending plate 8. The movable end of the cylinder 1702 is fixedly mounted with the mounting block 1703. The outer side of the mounting block 1703 is provided with a guide groove 1704 and a through hole 1705. The side of the mounting block 1703 away from the cylinder 1702 is provided with a stopper 1706. A guide block 1707 is fixedly installed on one side of the stop block 1706 close to the mounting block 1703, and a through hole 2 1708 is opened on the outside of the guide block 1707. A limiting rod 1709 adapted to the through hole 1705 and the through hole 2 1708 is plugged and installed on the outside of the mounting seat 1701. The limiting component 2 17 has the same structure as the limiting component 3 18. The bending disk 8, the rotating component 16 and the limiting component 2 17 constitute a bending mechanism. The guide block 1707 and the guide groove 1704 are plug-in installed, and the limiting rod 1709 passes through the through hole 1 1705 and the through hole 2 1708. The advantage is that the staff inserts the guide block 1707 into the guide groove 1704, and then passes the limit rod 1709 through the through hole 1705 and the through hole 2 1708, so as to realize the quick installation of the stop block 2 1706, which is convenient for maintenance or replacement after long-term use. Through the cooperation of the bending disk 8, the rotating component 16 and the limit component 2 17, after the air-conditioning pipe is clamped, the staff first starts the cylinder 1702 to make the stop block 2 1706 conflict with the bending disk 8, and limit the air-conditioning pipe between the two, and then starts the motor 1602. The output shaft of the motor 1602 rotates to drive the rotating plate 1603 to rotate, thereby driving the stop block 2 1706 to rotate, which can realize the rapid bending of the air-conditioning pipe and complete the forming work of the air-conditioning pipe, and is highly practical.

[0038] Working principle: During installation, the staff inserts the positioning rod two 305 into the inside of the positioning groove two 302, which can achieve the rapid positioning of the first stop block 304. After the rapid positioning of the first stop block 304, the staff inserts the limit block 308 into the inside of the limit groove 306, and at the same time inserts the insertion rod 309 into the inside of the second slot 303, which can achieve the rapid installation of the first stop block 304. After long-term use, it is convenient to repair or replace it. Subsequently, the staff inserts the second fixing block 5 into the inside of the groove 9, and at the same time inserts the first insertion block 6 into the inside of the first slot 10, which can achieve the rapid positioning of the bending disc 8. After the rapid positioning of the bending disc 8, the staff inserts the positioning rod one 13 into the inside of the first positioning groove 11, and then passes the bolt 15 through the second threaded hole 14 and extends it into the first threaded hole 7, which can achieve the rapid locking of the bending disc 8. During use or assembly, it is convenient for the rapid disassembly and assembly of the bending disc 8. Subsequently, the staff inserts the guide block 1707 into the inside of the guide groove 1704, and then passes the limit rod 1709 through the first through hole 1705 and the second through hole 1708, which can achieve the rapid installation of the second stop block 1706. After long-term use, it is convenient to repair or replace it. During use, the staff first turns on the external power supply. After clamping the air-conditioning duct, the staff first starts the cylinder 1702, so that the second stop block 1706 abuts against the bending disc 8, and the air-conditioning duct is limited between the two. Subsequently, the motor 1602 is started, and the output shaft of the motor 1602 rotates to drive the rotating plate 1603 to rotate, thereby driving the second stop block 1706 to rotate, which can achieve the rapid bending of the air-conditioning duct and complete the forming work of the air-conditioning duct. The practicability is relatively high. Through the cooperation of the clamping assembly 2, the first limiting assembly 3 and the third limiting assembly 18, when the air-conditioning duct is bent, it is not easy to shake, the stability is relatively high, and the bending accuracy is also improved.

[0039] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic forming device for automobile air-conditioning pipelines, comprising a frame (1) and a clamping assembly (2), characterized in that: One side of the frame (1) close to the clamping assembly (2) is fixedly installed with a first limiting assembly (3), a first fixing block (4) and a third limiting assembly (18). One side of the first fixing block (4) away from it is fixedly installed with a second fixing block (5). A first inserting block (6) is fixedly installed on the outer side of the second fixing block (5). A first threaded hole (7) is opened at one end of the second fixing block (5) away from the frame (1). One side of the first fixing block (4) away from it is provided with a bent disc (8). A groove (9), a first inserting slot (10) and a first positioning slot (11) are opened on one side of the bent disc (8) away from the first fixing block (4). A locking cover (12) is arranged on one side of the bent disc (8) away from the first fixing block (4). A first positioning rod (13) is fixedly installed on one side of the locking cover (12) close to the bent disc (8). A second threaded hole (14) is opened on one side of the locking cover (12) away from the bent disc (8). A bolt (15) threadedly connected to the second threaded hole (14) and adapted to the first threaded hole (7) is arranged on one side of the locking cover (12) away from the bent disc (8). A rotating assembly (16) is arranged at one end of the frame (1) away from the clamping assembly (2). A second limiting assembly (17) is fixedly installed on the outer side of the rotating assembly (16).

2. The fully automatic automotive air conditioning pipe forming equipment according to claim 1, wherein: The first limiting assembly (3) includes a fixing plate (301), a second positioning slot (302), a second inserting slot (303), a first stop block (304), a second positioning rod (305), a limiting slot (306), a limiting sleeve (307), a limiting block (308) and an inserting rod (309). A second positioning slot (302) and a second inserting slot (303) are opened at one end of the fixing plate (301) away from the frame (1). A first stop block (304) is arranged on the outer side of the fixing plate (301). A second positioning rod (305) is fixedly installed at one end of the first stop block (304) close to the fixing plate (301). A limiting slot (306) is opened at one end of the second positioning rod (305) close to the fixing plate (301). A limiting sleeve (307) is arranged on one side of the fixing plate (301) away from the first stop block (304). A limiting block (308) is fixedly installed inside the limiting sleeve (307). An inserting rod (309) is fixedly installed on one side of the limiting sleeve (307) close to the fixing plate (301). The second positioning rod (305) is inserted and installed in the second positioning slot (302). The cross section of the second positioning rod (305) is in a "T" shape structure.

3. The fully automatic automobile air-conditioning pipe forming equipment according to claim 2, wherein: The limiting block (308) is inserted and installed in the limiting slot (306). The inserting rod (309) is inserted and installed in the second inserting slot (303).

4. An automatic forming device for automobile air-conditioning pipelines according to claim 1, characterized in that: The first limiting assembly (3) and the third limiting assembly (18) together form a clamping mechanism. The clamping center of the clamping assembly (2) and the clamping mechanism is on the same horizontal line.

5. A fully automatic automotive air conditioning duct forming device according to claim 1, characterized in that: The second fixing block (5) is inserted and installed in the groove (9). The first inserting block (6) is inserted and installed in the first inserting slot (10).

6. An automatic forming device for automobile air-conditioning pipelines according to claim 1, characterized in that: The first positioning rod (13) is inserted and installed in the first positioning slot (11). The bolt (15) passes through the second threaded hole (14) and extends into the inside of the first threaded hole (7).

7. An automatic forming device for automobile air-conditioning pipelines according to claim 1, characterized in that: The rotating assembly (16) includes a mounting groove (1601), a motor (1602) and a rotating plate (1603). The motor (1602) is fixedly installed inside the mounting groove (1601), and the output end of the motor (1602) is fixedly installed with the rotating plate (1603). The second limiting assembly (17) includes a mounting base (1701), a cylinder (1702), a mounting block (1703), a guiding groove (1704), a first through hole (1705), a second stop block (1706), a guiding block (1707), a second through hole (1708) and a limiting rod (1709). A cylinder (1702) is fixedly installed on one side of the mounting base (1701) away from the bending disc (8). The movable end of the cylinder (1702) is fixedly installed with the mounting block (1703). A guiding groove (1704) and a first through hole (1705) are formed on the outer side of the mounting block (1703). A second stop block (1706) is arranged on one side of the mounting block (1703) away from the cylinder (1702). A guiding block (1707) is fixedly installed on the side of the second stop block (1706) close to the mounting block (1703). A second through hole (1708) is formed on the outer side of the guiding block (1707). A limiting rod (1709) adapted to the first through hole (1705) and the second through hole (1708) is inserted and installed on the outer side of the mounting base (1701). The second limiting assembly (17) has the same structure as the third limiting assembly (18). The bending disc (8), the rotating assembly (16) and the second limiting assembly (17) form a bending mechanism. The guiding block (1707) is inserted and installed in the guiding groove (1704), and the limiting rod (1709) passes through the first through hole (1705) and the second through hole (1708).

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