Brake disc with wear detection structure

Abstract

The invention discloses a brake disc with a wear detection structure, and relates to the field of brake discs, the brake disc comprises a mounting disc connected with a wheel output shaft, the rear side of the mounting disc is connected with a brake disc mechanism, the brake disc mechanism comprises a first brake disc and a second brake disc, and the diameter of the first brake disc is the same as that of the second brake disc; the second brake disc is arranged on the rear side of the first brake disc, a connecting mechanism is arranged among the first brake disc, the second brake disc and the mounting disc, and the first brake disc, the second brake disc and the mounting disc are combined. According to the brake disc with the wear detection structure, the wear blocks are arranged in the heat dissipation holes to detect the wear of the brake disc, when the wear of the brake disc reaches the wear blocks, the wear blocks can make contact with the brake pad to dye the surface of the first brake disc, a user can easily observe the wear blocks from the outer side of a vehicle, and the service life of the brake disc is prolonged. Therefore, corresponding maintenance and replacement are carried out in time, and the use safety of the brake disc is improved.

Description

Technical Field

[0001] The invention relates to the technical field of brake discs, in particular to a brake disc with a wear detection structure. Background Art

[0002] The brake disc is an important part of the vehicle's braking system. The vehicle's braking is achieved through the cooperation of the brake caliper and the brake disc. During the braking process, the brake pad will wear and the brake disc will also suffer a certain amount of wear. It needs to be replaced after reaching the maximum wear value.

[0003] Prior art 1 (application number CN202210850591.6, Chinese patent published on September 13, 2022) A vehicle brake disc, including a main body assembly, the main body assembly includes an annular disc plate, a disc cap, a frame rod and a modular plate assembly, the disc cap is welded to the front side of the annular disc plate, the frame rod is welded to the edge of the annular disc plate, the modular plate assembly includes an arc disc plate, an installation arc block and a reinforcement convex edge block, the braking part of the entire brake disc can be evenly divided into five areas through the modular plate assembly, and a single or multiple modular plate assemblies can be evenly divided into five areas when local damage or severe wear occurs and all modular plate assemblies have been in service for too long It can be quickly disassembled and replaced, so when the brake part is partially damaged or needs to be replaced, it does not need to be replaced as a whole, which can save materials and reduce resource waste. The frame rod and the internal structure of the annular disc plate can generate airflow during driving, so the arc disc plate can be further effectively dissipated. Prior art 2 (application number CN201610926123.7, Chinese patent published on December 31, 2019) A split brake disc, which includes a brake disc body and a brake disc hub, the brake disc body and the brake disc hub are connected to each other through a fixing, and a retaining spring is clamped between the fixing and the brake disc body. The split brake disc of the present invention adopts a structure in which the brake disc body and the brake disc hub are separated, so that the brake disc hub can directly become a part of the hub bearing rotor, so that the brake disc body and the hub bearing can be further integrated, eliminating the part of the brake disc hub in the middle of the traditional brake disc, which can further improve the integration and lightweight of the product.

[0004] The current brake disc adopts a split design, which can be easily replaced. However, when the brake disc is in use, the degree of wear of the brake disc cannot be perceived in time. It is generally judged by the brake foot feel. However, since the wear of the brake disc is a slow process, it cannot be effectively perceived when it changes slowly over a long period of time. Continuing to use the brake disc after the wear reaches the maximum value will have certain risks. The current brake disc cannot detect wear. Summary of the invention

[0005] The purpose of the present invention is to provide a brake disc with a wear detection structure to solve the problem raised in the above background technology that the wear degree of the brake disc cannot be perceived in time when the brake disc is in use, and is generally judged by the brake foot feel. However, since the wear of the brake disc is a slow process, it cannot be effectively perceived when it changes slowly over a long period of time. Continuing to use the brake disc after the wear reaches the maximum value will result in certain risks.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a brake disc with a wear detection structure, comprising a mounting disc connected to a wheel output shaft, and a brake disc mechanism is connected to the rear side of the mounting disc, the brake disc mechanism comprises a first brake disc and a second brake disc, the diameter of the first brake disc is the same as that of the second brake disc, and the second brake disc is arranged at the rear side of the first brake disc, and a connecting mechanism is arranged between the first brake disc, the second brake disc and the mounting disc, the first brake disc, the second brake disc and the mounting disc are combined, a reinforcing plate is fixed to the front side of the second brake disc, the reinforcing plates are distributed at equal angles, and the reinforcing plate is arranged between the first brake disc and the second brake disc, heat dissipation holes are opened inside the first brake disc and the second brake disc, and the heat dissipation holes and the reinforcing plates are staggered, a wear block is arranged on the rear side of the first brake disc, and the wear block is inserted into the heat dissipation hole, the brake pad is dyed after the wear block and the brake pad are released, and a mounting support mechanism is arranged on the rear side of the wear block to stably mount the wear block on the front side of the second brake disc.

[0007] To further optimize the technical solution, the connection mechanism includes a docking hole and a mounting member; The docking holes are evenly arranged inside the mounting disc, the first brake disc and the second brake disc; The mounting piece penetrates through the docking hole to connect the mounting disc, the first brake disc and the second brake disc, and the rear end of the mounting piece is in an enlarged structure and is clamped into the interior of the second brake disc.

[0008] To further optimize the technical solution, a clamping groove corresponding to the reinforcing plate is provided on the rear side of the first brake disc, and a clamping structure is formed between the clamping groove and the reinforcing plate.

[0009] To further optimize the technical solution, a dye storage bin is provided inside the wear block, and an isolation membrane is provided inside the dye storage bin, and the isolation membrane separates the dye storage bin into different bin bodies for storing dyes of different colors.

[0010] To further optimize the technical solution, the mounting support mechanism includes a fitting seat, a movable seat and a return spring; A fitting seat, arranged at the front side of the second brake disc and fitting with the second brake disc; The movable seat is arranged at the front side of the fitting seat and fits with the rear side of the first brake disc, and the movable seat is connected to the wear block to control the wear block to be inserted into the heat dissipation hole; The return spring is arranged between the fitting seat and the movable seat, and provides a thrust for the movable seat so that the movable seat and the fitting seat are kept in close contact with the first brake disc and the second brake disc.

[0011] To further optimize the technical solution, a mounting mechanism is provided on the rear side of the wear block, and the wear block is detachably connected to the movable seat through the mounting mechanism.

[0012] Further optimizing the technical solution, the mounting mechanism includes a connecting seat, a mounting head and a mounting seat; The connecting seat is fixed on the rear side of the wear block, and the connecting seat is designed as a regular polygonal structure; A mounting head is fixed to the rear side of the connecting seat; The mounting seat is arranged inside the movable seat, and a threaded connection is formed between the mounting seat and the mounting head.

[0013] To further optimize the technical solution, a control plate is fixed on the rear side of the connecting seat, and a front-rear sliding structure is formed between the control plate and the movable seat, and an adjustment rod passes through the inside of the control plate, a threaded connection is formed between the adjustment rod and the control plate, and a rotational connection is formed between the adjustment rod and the movable seat, and a first control head is fixed to the front end of the adjustment rod, and the first control head is embedded in the inside of the movable seat.

[0014] To further optimize the technical solution, an auxiliary block is fixed on the rear side of the fitting seat, and a concave-convex matching structure is formed between the auxiliary block and the heat dissipation hole to provide an installation position for the fitting seat, and an auxiliary supporting mechanism is provided on the fitting seat to support the fitting seat on the inner side of the reinforcing plate.

[0015] Further optimizing the technical solution, the auxiliary support mechanism includes a support block, a movable plate, a movable head, a first gear, a mounting shaft, a second gear, a driving block, a control rod and a second control head; The support block is arranged on the outer side of the fitting seat, and the support block and the reinforcing plate are fitted together; The movable plate is arranged on the inner side of the supporting block, and a horizontal sliding structure is formed between the movable plate and the fitting seat; A movable head is arranged at the outer end of the movable plate, and a rotation connection is formed between the movable head and the supporting block; A first gear is arranged above the movable plate and is meshedly connected with the movable plate; An installation shaft is fixed at the middle of the first gear and is rotatably installed inside the fitting seat; The second gear is arranged at the rear side of the first gear, and the second gear is fixedly connected to the mounting shaft; A driving block is arranged inside the second gear and meshed with the second gear, and an up-and-down sliding structure is formed between the driving block and the fitting seat; A control rod passes through the driving block and forms a threaded connection between the driving block, and a rotational connection is formed between the control rod and the fitting seat; The second control head is fixed above the control rod, and the second control head protrudes from the surface of the fitting seat.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) The wear of the brake disc is detected by placing a wear block in the heat dissipation hole. When the wear of the brake disc reaches the wear block, the wear block can contact the brake pad so that the color is dyed to the surface of the first brake disc. The user can easily observe it from the outside of the vehicle, so that corresponding maintenance and replacement can be carried out in time, thereby improving the safety of the use of the brake disc.

[0017] (2) The dyeing effect is provided by the dye in the dye storage bin in the wear block, and the dye storage bin can be separated by an isolation membrane to form different dyeing effects, and the wear condition of the brake disc can be reflected according to the color change.

[0018] (3) The extension length of the wear block can be controlled by moving the mounting seat, thereby adjusting the wear detection range of the wear block. In addition, the wear block and the mounting seat are detachably connected and can be replaced separately later, thereby reducing maintenance costs.

[0019] (4) By setting up the auxiliary support mechanism outside the fitting seat, the fitting seat can maintain good stability and provide a stable support effect for the wear block, and the fitting seat can be removed from the second brake disc and can be reused later.

[0020] (5) By using the split arrangement of the first brake disc, the second brake disc and the mounting disc, the components can be replaced separately during subsequent replacement, saving replacement costs. For a single-piston brake, only one side of the brake disc can be replaced, reducing the use cost and material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a rear view structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the second brake disc of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the first brake disc of the present invention; Figure 5 This is a schematic diagram of the front view of the second brake disc of the present invention; Figure 6 It is a schematic diagram of the side section structure of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the laminating seat of the present invention; Figure 8 It is a schematic diagram of the side section structure of the movable seat of the present invention; Fig. 9 This is a schematic diagram of the main cross-sectional structure of the wear block of the present invention; Fig.10 This is a schematic diagram of the main cross-sectional structure of the laminating seat of the present invention; Fig.11 It is a schematic diagram of the internal structure of the laminating seat of the present invention.

[0022] In the figure: 1. mounting disc; 2. first brake disc; 3. second brake disc; 4. heat dissipation hole; 5. reinforcement plate; 6. slot; 7. docking hole; 8. mounting piece; 9. fitting seat; 10. movable seat; 11. return spring; 12. auxiliary block; 13. wear block; 14. connecting seat; 15. mounting head; 16. mounting seat; 17. control board; 18. adjustment rod; 19. first control head; 20. dye storage bin; 21. isolation membrane; 22. support block; 23. movable plate; 24. movable head; 25. first gear; 26. mounting shaft; 27. second gear; 28. drive block; 29. ​​control rod; 30. second control head. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 11 , the present invention provides the following technical solution: a brake disc with a wear detection structure, comprising a mounting disc 1 connected to a wheel output shaft, and a brake disc mechanism is connected to the rear side of the mounting disc 1; Embodiment 1: The present invention provides the following technical solution, which discloses a brake disc mechanism including a first brake disc 2 and a second brake disc 3. The diameter of the first brake disc 2 is the same as that of the second brake disc 3, and the second brake disc 3 is arranged at the rear side of the first brake disc 2, and a connecting mechanism is arranged between the first brake disc 2, the second brake disc 3 and the mounting disc 1, and the first brake disc 2, the second brake disc 3 and the mounting disc 1 are combined. A reinforcing plate 5 is fixed to the front side of the second brake disc 3, and the reinforcing plates 5 are distributed at equal angles, and the reinforcing plate 5 is arranged between the first brake disc 2 and the second brake disc 3. Heat dissipation holes 4 are opened inside the first brake disc 2 and the second brake disc 3, and the heat dissipation holes 4 and the reinforcing plates 5 are staggered. The rear side of the first brake disc 2 is provided with A wear block 13 is provided, and the wear block 13 is inserted into the heat dissipation hole 4. After the wear block 13 and the brake pad are released, the brake pad is dyed. A mounting support mechanism is provided on the rear side of the wear block 13 to stably mount the wear block 13 on the front side of the second brake disc 3. The connecting mechanism includes a docking hole 7 and a mounting member 8. The docking holes 7 are evenly arranged inside the mounting disc 1, the first brake disc 2 and the second brake disc 3. The mounting member 8 penetrates the docking holes 7 to connect the mounting disc 1, the first brake disc 2 and the second brake disc 3, and the rear end of the mounting member 8 is in an enlarged structure and is inserted into the interior of the second brake disc 3. A card slot 6 corresponding to the reinforcing plate 5 is provided on the rear side of the first brake disc 2, and a card slot 6 and the reinforcing plate 5 form a card engagement structure.

[0025] The first brake disc 2 and the second brake disc 3 can be installed through the mounting disc 1. The first brake disc 2, the second brake disc 3 and the mounting disc 1 are connected by the cooperation between the docking hole 7 and the mounting part 8. They can be split and replaced separately later. For example, when a single-piston brake caliper is used, only the first brake disc 2 can be replaced. When a double-piston brake caliper is used, the first brake disc 2 and the second brake disc 3 can be replaced at the same time. After the first brake disc 2 is worn, its thickness gradually decreases, and the brake pad approaches the wear block 13. When the wear block 13 completely leaks out of the heat dissipation hole 4, the brake pad and the wear block 13 are released, and the brake pad is dyed so that it is dyed to the surface of the first brake disc 2, so that it is convenient for personnel to observe the wear condition in time.

[0026] Embodiment 2: On the basis of embodiment 1, it is disclosed that a dye storage bin 20 is provided inside the wear block 13, and an isolation membrane 21 is provided inside the dye storage bin 20, the isolation membrane 21 divides the dye storage bin 20 into different bins for storing dyes of different colors, the mounting support mechanism comprises a fitting seat 9, a movable seat 10 and a return spring 11, the fitting seat 9 is arranged on the front side of the second brake disc 3 and fits with the second brake disc 3, the movable seat 10 is arranged on the front side of the fitting seat 9 and fits with the rear side of the first brake disc 2, and the movable seat 10 and the wear block 13 are connected to control the wear block 13 to be inserted into the heat dissipation hole 4, the return spring 11 is arranged between the fitting seat 9 and the movable seat 10, and provides thrust for the movable seat 10 so that the movable seat 10 and the fitting seat 9 are kept in close contact with the first brake disc 2 and the second brake disc 3, and the rear side of the wear block 13 is provided with an installation mechanism. The wear block 13 is detachably connected to the movable seat 10 through the mounting mechanism. The mounting mechanism includes a connecting seat 14, a mounting head 15 and a mounting seat 16. The connecting seat 14 is fixed to the rear side of the wear block 13, and the connecting seat 14 is designed as a regular polygonal structure. The mounting head 15 is fixed to the rear side of the connecting seat 14. The mounting seat 16 is arranged inside the movable seat 10, and a threaded connection is formed between the mounting seat 16 and the mounting head 15. A control board 17 is fixed to the rear side of the connecting seat 14, and a front-rear sliding structure is formed between the control board 17 and the movable seat 10, and an adjusting rod 18 runs through the inside of the control board 17, a threaded connection is formed between the adjusting rod 18 and the control board 17, and a rotational connection is formed between the adjusting rod 18 and the movable seat 10, and a first control head 19 is fixed to the front end of the adjusting rod 18, and the first control head 19 is embedded in the movable seat 10.

[0027] Dyes of different colors can be set in the dye storage bin 20 to reflect the different thickness wear conditions of the first brake disc 2, and the detection thickness of the wear block 13 can be adjusted according to the needs of use. During adjustment, the first control head 19 is twisted by a tool to drive the adjustment rod 18 to rotate, and the adjustment rod 18 drives the wear block 13 to move through the control panel 17 to adjust the extension distance of the wear block 13. After the wear block 13 is used, the connecting seat 14 can be rotated to release the threaded connection between the mounting head 15 and the mounting seat 16, and it can be removed from the front side of the movable seat 10, and a new wear block 13 can be replaced to continue to be used.

[0028] Embodiment 3: On the basis of embodiment 2, it is disclosed that: an auxiliary block 12 is fixed to the rear side of the fitting seat 9, and a concave-convex matching structure is formed between the auxiliary block 12 and the heat dissipation hole 4 to provide positioning of the installation position for the fitting seat 9, and an auxiliary supporting mechanism is provided on the fitting seat 9 to support the fitting seat 9 on the inner side of the reinforcing plate 5, and the auxiliary supporting mechanism includes a supporting block 22, a movable plate 23, a movable head 24, a first gear 25, an installation shaft 26, a second gear 27, a driving block 28, a control rod 29 and a second control head 30, the supporting block 22 is arranged on the outer side of the fitting seat 9, and the supporting block 22 and the reinforcing plate 5 are fitted together, the movable plate 23 is arranged on the inner side of the supporting block 22, and a horizontal sliding structure is formed between the movable plate 23 and the fitting seat 9, the movable head 24 is arranged at the outer end of the movable plate 23, and the movable head 24 and The support blocks 22 are rotatably connected, the first gear 25 is arranged above the movable plate 23 and is meshed with the movable plate 23, the mounting shaft 26 is fixed at the middle of the first gear 25, and the mounting shaft 26 is rotatably installed inside the fitting seat 9, the second gear 27 is arranged on the rear side of the first gear 25, and the second gear 27 and the mounting shaft 26 are fixedly connected, the driving block 28 is arranged on the inner side of the second gear 27 and is meshed with the second gear 27, and an up and down sliding structure is formed between the driving block 28 and the fitting seat 9, the control rod 29 passes through the driving block 28 and is threadedly connected between the driving block 28, and a rotatable connection is formed between the control rod 29 and the fitting seat 9, and the second control head 30 is fixed above the control rod 29, and the second control head 30 protrudes from the surface of the fitting seat 9.

[0029] When installing the wear block 13, the fitting seat 9 can be positioned on the front side of the second brake disc 3 through the connection between the auxiliary block 12 and the heat dissipation hole 4, and then the control rod 29 can be driven to rotate through the second control head 30 to drive the driving block 28 to move, and the driving block 28 drives the installation shaft 26 to rotate through the engagement with the second gear 27, and the installation shaft 26 drives the first gear 25 to rotate, and the first gear 25 drives the movable plate 23 to move through the engagement with the movable plate 23, and the movable plate 23 drives the support block 22 to move, so that the support block 22 and the reinforcing plate 5 are fitted to provide stable support for the fitting seat 9, and then the first brake disc 2 is installed, and the wear block 13 will be automatically inserted into the heat dissipation hole 4 in the first brake disc 2 to achieve the wear detection effect.

[0030] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A brake disc with a wear detection structure, comprising a mounting disc (1) connected to a wheel output shaft, wherein a brake disc mechanism is connected to the rear side of the mounting disc (1); Features: The brake disc mechanism comprises a first brake disc (2) and a second brake disc (3), wherein the diameter of the first brake disc (2) is the same as that of the second brake disc (3), and the second brake disc (3) is arranged at the rear side of the first brake disc (2), and a connecting mechanism is arranged between the first brake disc (2), the second brake disc (3) and the mounting disc (1), and the first brake disc (2), the second brake disc (3) and the mounting disc (1) are combined, and a reinforcing plate (5) is fixed to the front side of the second brake disc (3), the reinforcing plates (5) are distributed at equal angles, and the reinforcing plates (5) are arranged Between the first brake disc (2) and the second brake disc (3), the first brake disc (2) and the second brake disc (3) are both provided with heat dissipation holes (4), and the heat dissipation holes (4) and the reinforcing plate (5) are arranged in a staggered manner; a wear block (13) is arranged on the rear side of the first brake disc (2), and the wear block (13) is inserted into the interior of the heat dissipation hole (4); after the wear block (13) and the brake pad are released, the brake pad is dyed; and a mounting support mechanism is arranged on the rear side of the wear block (13), so that the wear block (13) is stably mounted on the front side of the second brake disc (3).

2. The brake disc with a wear detection structure according to claim 1, characterized in that: The connection mechanism comprises a docking hole (7) and a mounting member (8); The docking holes (7) are evenly arranged inside the mounting disc (1), the first brake disc (2) and the second brake disc (3); The mounting member (8) penetrates the docking hole (7) to connect the mounting disc (1), the first brake disc (2) and the second brake disc (3), and the rear end of the mounting member (8) is in an enlarged structure and is inserted into the interior of the second brake disc (3).

3. The brake disc with a wear detection structure according to claim 1, characterized in that: A clamping groove (6) corresponding to the reinforcing plate (5) is provided on the rear side of the first brake disc (2), and a clamping structure is formed between the clamping groove (6) and the reinforcing plate (5).

4. The brake disc with a wear detection structure according to claim 1, characterized in that: The wear block (13) is provided with a dye storage bin (20) inside, and an isolation membrane (21) is provided inside the dye storage bin (20), and the isolation membrane (21) separates the dye storage bin (20) into different bin bodies for storing dyes of different colors.

5. The brake disc with a wear detection structure according to claim 1, characterized in that: The mounting support mechanism comprises a fitting seat (9), a movable seat (10) and a return spring (11); A fitting seat (9) is arranged on the front side of the second brake disc (3) and fits the second brake disc (3); A movable seat (10) is arranged on the front side of the fitting seat (9) and fits with the rear side of the first brake disc (2), and the movable seat (10) is connected to the wear block (13) to control the wear block (13) to be inserted into the heat dissipation hole (4); A return spring (11) is arranged between the fitting seat (9) and the movable seat (10) to provide a thrust for the movable seat (10) so that the movable seat (10) and the fitting seat (9) are kept in close contact with the first brake disc (2) and the second brake disc (3).

6. The brake disc with a wear detection structure according to claim 5, characterized in that: A mounting mechanism is provided on the rear side of the wear block (13), and the wear block (13) is detachably connected to the movable seat (10) via the mounting mechanism.

7. The brake disc with a wear detection structure according to claim 6, characterized in that: The mounting mechanism comprises a connecting seat (14), a mounting head (15) and a mounting seat (16); A connecting seat (14) is fixed to the rear side of the wear block (13), and the connecting seat (14) is designed to be a regular polygonal structure; A mounting head (15) fixed to the rear side of the connecting seat (14); The mounting seat (16) is arranged inside the movable seat (10), and a threaded connection is formed between the mounting seat (16) and the mounting head (15).

8. The brake disc with a wear detection structure according to claim 7, characterized in that: A control plate (17) is fixed to the rear side of the connecting seat (14), and a front-to-rear sliding structure is formed between the control plate (17) and the movable seat (10), and an adjustment rod (18) runs through the interior of the control plate (17), a threaded connection is formed between the adjustment rod (18) and the control plate (17), and a rotational connection is formed between the adjustment rod (18) and the movable seat (10), and a first control head (19) is fixed to the front end of the adjustment rod (18), and the first control head (19) is embedded in the interior of the movable seat (10).

9. A brake disc with a wear detection structure according to claim 5 or 8, characterized in that: An auxiliary block (12) is fixed to the rear side of the fitting seat (9), and a concave-convex matching structure is formed between the auxiliary block (12) and the heat dissipation hole (4), providing a positioning for the fitting seat (9) at the installation position. An auxiliary supporting mechanism is provided on the fitting seat (9) to support the fitting seat (9) on the inner side of the reinforcing plate (5).

10. The brake disc with a wear detection structure according to claim 9, characterized in that: The auxiliary support mechanism comprises a support block (22), a movable plate (23), a movable head (24), a first gear (25), a mounting shaft (26), a second gear (27), a driving block (28), a control rod (29) and a second control head (30); A support block (22) is arranged on the outside of the fitting seat (9), and the support block (22) and the reinforcing plate (5) are fitted together; A movable plate (23) is arranged on the inner side of the support block (22), and a horizontal sliding structure is formed between the movable plate (23) and the fitting seat (9); A movable head (24) is arranged at the outer end of the movable plate (23), and a rotation connection is formed between the movable head (24) and the support block (22); A first gear (25) is disposed above the movable plate (23) and is meshedly connected with the movable plate (23); A mounting shaft (26) is fixed to the middle of the first gear (25), and the mounting shaft (26) is rotatably mounted inside the fitting seat (9); A second gear (27) is arranged on the rear side of the first gear (25), and the second gear (27) is fixedly connected to the mounting shaft (26); A driving block (28) is arranged on the inner side of the second gear (27) and is meshed with the second gear (27), and an up-and-down sliding structure is formed between the driving block (28) and the fitting seat (9); A control rod (29) passes through the driving block (28) to form a threaded connection between the driving block (28), and a rotational connection is formed between the control rod (29) and the fitting seat (9); The second control head (30) is fixed above the control rod (29), and the second control head (30) protrudes from the surface of the fitting seat (9).

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