Automatic hobbing device for edge sealing in production of reinforced gypsum plaster board
By designing an automatic rolling cutter for edge banding in the production of reinforced gypsum board with bonding and limiting components, the problem of unreliable bonding between edge banding paper and gypsum board was solved, achieving tight bonding of edge banding tape and improved stability of gypsum board.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAISHAN GYPSUM (GUANGDONG) CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-05-19
AI Technical Summary
The existing automatic rolling and cutting device for edge banding of reinforced paper-faced gypsum board is not very effective when the edge banding paper is bonded to the gypsum board, especially on the top and bottom sides of the gypsum board, which is not secure and affects the quality of edge banding.
Design an automatic rolling and cutting device for edge banding in the production of reinforced paper-faced gypsum board, including a bonding component and a limiting component. The bonding component consists of a fixed plate, a moving frame, bonding wheels, guide racks, etc., and can automatically adjust the displacement of the bonding wheels according to the width of the gypsum board to ensure that the edge banding is tightly bonded. The limiting component limits the top of the gypsum board to prevent jumping.
It improves the adhesion of the edge banding tape, enhances the aesthetics and structural stability of the gypsum board, and ensures the stability and accuracy of the edge banding process.
Smart Images
Figure CN224255658U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gypsum board production technology, specifically to an automatic rolling and cutting device for edge sealing in the production of reinforced paper-faced gypsum board. Background Technology
[0002] In the construction and decoration industry, reinforced gypsum board is widely used due to its lightweight, fire resistance, and sound insulation properties. Edge banding is a crucial process in gypsum board production, designed to improve the product's aesthetics and structural stability. Traditional edge banding involves continuously adhering edge banding tape to the sides of the gypsum board, then manually or mechanically cutting off excess material to accommodate different board sizes. However, existing automatic edge banding cutting devices have some limitations in practical applications.
[0003] The existing methods for applying edge banding paper mostly involve pre-guiding the edge banding paper onto the side of the gypsum board using a vertically placed edge banding paper roller. A concave-shaped applicator roller, designed to fit the side of the gypsum board, then applies the edge banding paper to the board. This method results in poor adhesion between the edge banding paper and the gypsum board, especially on the top and bottom sides. The lack of a device to further press the edge banding paper together makes the adhesion weak, compromising the sealing effect and affecting the quality of the gypsum board. Therefore, improving existing edge banding devices and designing a new type of automatic roller-cutting device for producing reinforced paper-faced gypsum board edge banding to address these technical shortcomings and improve the overall stability of the edge banding system is of paramount importance. Utility Model Content
[0004] The purpose of this invention is to provide an automatic rolling and cutting device for edge banding in the production of reinforced gypsum board. This device can automatically adjust the displacement of the bonding rollers according to the width of the gypsum board, ensuring that the edge banding tape is tightly bonded to the surface of the gypsum board. This improves the bonding effect of the edge banding tape, enhances the aesthetics and structural stability of the gypsum board, and simultaneously limits the top of the gypsum board to prevent vertical movement during the edge banding process, thus improving the stability of the edge banding process and ensuring that the edge banding tape is accurately bonded to the surface of the gypsum board, thereby enhancing the edge banding effect and solving the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] An automatic rolling cutter for edge banding in the production of reinforced gypsum board includes a conveyor frame body, a connecting cover at the top of the conveyor frame body, a bonding component at the rear end inside the connecting cover, a limiting component inside the bonding component, connecting shells fixedly connected to both ends of the front end of the connecting cover, an edge banding strip inside the connecting shell, and a cutting component at the front end inside the connecting cover.
[0007] The bonding assembly is used to bond the edge banding tape to the surface of the gypsum board. The bonding assembly consists of a fixed plate, two sets of movable frames, multiple sets of bonding wheels, and two sets of guide racks. The fixed plate is fixedly connected to the rear end inside the connecting cover. The two sets of movable frames are slidably connected to the two sides of the bottom of the fixed plate. The multiple sets of bonding wheels are rotatably connected to the bottom of the inner side of the movable frames. The fixed frame is fixedly connected to the middle of the bottom of the fixed plate. The guide racks are fixedly connected to the top of the inner side of the movable frames.
[0008] The limiting component is used to limit the top of the gypsum board;
[0009] The cutting assembly is used to cut the edge banding tape.
[0010] As a preferred embodiment of this utility model, multiple sets of the bonding wheels are distributed at equal intervals on the inner side of the movable frame, and multiple balls are rotatably connected to both ends inside the fixed frame, and the guide rack is slidably connected to the balls.
[0011] As a preferred embodiment of this utility model, a guide gear is rotatably connected in the middle of the interior of the fixing frame, and the guide rack is meshed with the guide gear. The two sets of guide racks are designed in a symmetrical structure on the outside of the guide gear.
[0012] As a preferred embodiment of this utility model, a first telescopic cylinder is fixedly connected to the top of the fixed plate, and a moving rod is fixedly connected to the driving end of the first telescopic cylinder. The moving rod is slidably connected to the fixed plate, and the moving rod extends to the bottom of the fixed plate and is fixedly connected to a set of moving frames.
[0013] As a preferred embodiment of this utility model, both ends of the bottom of the fixed plate are fixedly connected to sliding rods, and the movable frame is slidably connected to the sliding rods.
[0014] As a preferred embodiment of this utility model, the limiting assembly consists of a connecting plate, a guide rod, two sets of moving blocks, two sets of rotating rods, a moving plate, and multiple sets of limiting wheels. The connecting plate is fixedly connected to the middle of the inner side of the moving frame, the guide rod is fixedly connected to the bottom of the connecting plate, the two sets of moving blocks are slidably connected to the two ends of the guide rod, the rotating rod is rotatably connected to the bottom of the moving blocks, the moving plate is located at the bottom of the two sets of rotating rods, and the multiple sets of limiting wheels are rotatably connected to the bottom of the moving plate.
[0015] As a preferred embodiment of this utility model, the movable plate and the rotating rod are rotatably connected, and compression springs are sleeved on both ends of the guide rod and on the outside of the two sets of movable blocks. The two ends of the compression springs are fixedly connected to the guide rod and the movable block, respectively.
[0016] As a preferred embodiment of this utility model, damping springs are fixedly connected to both ends of the top of the movable plate, and the top of the damping springs is fixedly connected to the connecting plate.
[0017] As a preferred embodiment of this utility model, the cutting assembly comprises a connecting frame, a connecting frame, a cutter, two sets of synchronous pulleys, a synchronous belt, multiple sets of limiting rods, and multiple sets of rollers. The connecting frame is fixedly connected to the front end inside the connecting cover. The connecting frame is slidably connected to the outside of the connecting frame. The cutter is slidably connected to the bottom end of the connecting frame. Both sets of synchronous pulleys are rotatably connected to both sides of the connecting frame. The synchronous belt is located outside the two sets of synchronous pulleys. The multiple sets of limiting rods are slidably connected to both ends of the connecting frame and slidably connected to the inside of the connecting cover. The rollers are rotatably connected to the bottom of the limiting rods. A return spring is sleeved on the outside of the limiting rod. The two ends of the return spring are fixedly connected to the limiting rod and the connecting cover, respectively. A second telescopic cylinder is fixedly connected inside the connecting frame. The driving end of the second telescopic cylinder is fixedly connected to the cutter. A drive motor is fixedly connected to the end of the connecting frame away from the connecting frame. The driving end of the drive motor is fixedly connected to a set of synchronous pulleys.
[0018] Compared with the prior art, the beneficial effects of this utility model are:
[0019] 1. In this utility model, the bonding component is designed to consist mainly of a fixed plate, two sets of movable frames, multiple sets of bonding wheels, and two sets of guide racks. The fixed plate is fixedly connected to the rear end inside the connecting cover. The two sets of movable frames are slidably connected to both sides of the bottom of the fixed plate. The multiple sets of bonding wheels are rotatably connected to the bottom of the inner side of the movable frames for bonding the edge banding to the surface of the gypsum board. The fixed frame is fixedly connected to the middle of the bottom of the fixed plate. The guide racks are fixedly connected to the top of the inner side of the movable frames for adjusting the displacement of the movable frames. The displacement of the bonding wheels can be automatically adjusted according to the width of the gypsum board to ensure that the edge banding can be tightly bonded to the surface of the gypsum board, thereby improving the bonding effect of the edge banding and enhancing the aesthetics and structural stability of the gypsum board.
[0020] 2. In this utility model, through the design of the limiting component, the limiting component consists of a connecting plate, a guide rod, two sets of moving blocks, two sets of rotating rods, a moving plate, and multiple sets of limiting wheels. The connecting plate is fixedly connected to the middle of the inner side of the moving frame, the guide rod is fixedly connected to the bottom of the connecting plate, the two sets of moving blocks are slidably connected to the two ends of the guide rod, the rotating rod is rotatably connected to the bottom of the moving block, the moving plate is located at the bottom of the two sets of rotating rods, and multiple sets of limiting wheels are rotatably connected to the bottom of the moving plate. This is used to limit the top of the gypsum board, preventing it from jumping vertically during the edge sealing process, improving the stability of the edge sealing process, ensuring that the edge sealing tape can accurately adhere to the surface of the gypsum board, and enhancing the edge sealing effect of the gypsum board. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0022] Figure 2 This is a schematic diagram of the bonding component structure of this utility model;
[0023] Figure 3 This is a schematic diagram of the fixing frame structure of this utility model;
[0024] Figure 4 This is a schematic diagram of the limiting component structure of this utility model;
[0025] Figure 5 This is a schematic diagram of the cutting component structure of this utility model.
[0026] In the diagram: 1. Conveyor frame body; 2. Connecting cover; 3. Bonding assembly; 4. Limiting assembly; 5. Connecting shell; 6. Sealing tape; 7. Cutting assembly; 8. Fixing plate; 9. Moving frame; 10. Bonding wheel; 11. Fixing frame; 12. Guide rack; 13. Guide gear; 14. Moving rod; 15. Sliding rod; 16. Connecting plate; 17. Guide rod; 18. Moving block; 19. Rotating rod; 20. Moving plate; 21. Limiting wheel; 22. Compression spring; 23. Damping spring; 24. Connecting frame; 25. Connecting frame; 26. Cutter; 27. Synchronous pulley; 28. Synchronous belt; 29. Limiting rod; 30. Roller; 31. Return spring. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.
[0028] Example:
[0029] Please see Figures 1-5 This utility model provides a technical solution:
[0030] An automatic rolling cutter for edge sealing of reinforced gypsum board production includes a conveyor frame body 1, a connecting cover 2 on the top of the conveyor frame body 1, a bonding component 3 inside the rear end of the connecting cover 2, a limiting component 4 inside the bonding component 3, connecting shells 5 fixedly connected to both ends of the front end of the connecting cover 2, an edge sealing strip 6 inside the connecting shell 5, and a cutting component 7 inside the front end of the connecting cover 2.
[0031] The bonding assembly 3 is used to bond the edge banding tape 6 to the surface of the gypsum board. The bonding assembly 3 consists of a fixed plate 8, two sets of movable frames 9, multiple sets of bonding wheels 10, a fixed frame 11, and two sets of guide racks 12. The fixed plate 8 is fixedly connected to the rear end inside the connecting cover 2. The two sets of movable frames 9 are slidably connected to the two sides of the bottom of the fixed plate 8. The multiple sets of bonding wheels 10 are rotatably connected to the bottom of the inner side of the movable frame 9. The fixed frame 11 is fixedly connected to the middle of the bottom of the fixed plate 8. The guide racks 12 are fixedly connected to the top of the inner side of the movable frame 9.
[0032] The limiting component 4 is used to limit the top of the gypsum board;
[0033] The cutting component 7 is used to cut the edge banding tape 6.
[0034] Furthermore, multiple sets of contact wheels 10 are evenly distributed on the inner side of the movable frame 9, and multiple balls are rotatably connected to both ends inside the fixed frame 11. The guide rack 12 is slidably connected to the balls and the fixed frame 11. When the guide rack 12 moves, it can be guided by the balls, so that the guide rack 12 can move stably.
[0035] The fixed frame 11 has a guide gear 13 rotatably connected in the middle. The guide rack 12 is meshed with the guide gear 13. The two sets of guide racks 12 are symmetrically designed on the outside of the guide gear 13. The top of the fixed plate 8 is fixedly connected to a first telescopic cylinder. The drive end of the first telescopic cylinder is fixedly connected to a moving rod 14. The moving rod 14 is slidably connected to the fixed plate 8. The moving rod 14 extends to the bottom of the fixed plate 8 and is fixedly connected to a set of moving frames 9. When the first telescopic cylinder is activated, the moving rod 14 is moved, causing the set of moving frames 9 to move. This causes the guide rack 12 on its outside to move, causing the guide gear 13 to rotate, causing the other set of guide racks 12 to move. This allows the two sets of moving frames 9 to move closer to each other. The displacement of multiple sets of bonding wheels 10 is adjusted according to the width of the gypsum board, so that the edge banding 6 can be bonded to the surface of the gypsum board.
[0036] Furthermore, sliding rods 15 are fixedly connected to both ends of the bottom of the fixed plate 8. The movable frame 9 is slidably connected to the sliding rods 15. When the movable frame 9 is displaced, the sliding rods 15 can guide it, so that the movable frame 9 can be displaced stably.
[0037] Furthermore, the limiting component 4 consists of a connecting plate 16, a guide rod 17, two sets of moving blocks 18, two sets of rotating rods 19, a moving plate 20, and multiple sets of limiting wheels 21. The connecting plate 16 is fixedly connected to the middle of the inner side of the moving frame 9, the guide rod 17 is fixedly connected to the bottom of the connecting plate 16, the two sets of moving blocks 18 are slidably connected to the two ends of the guide rod 17, the rotating rods 19 are rotatably connected to the bottom of the moving blocks 18, the moving plate 20 is located at the bottom of the two sets of rotating rods 19, and the multiple sets of limiting wheels 21 are rotatably connected to the bottom of the moving plate 20. When the bonding component 3 bonds the edge sealing strip 6 to both ends of the gypsum board, the limiting component 4 can limit the top of the gypsum board, ensuring the stability of its displacement and preventing it from jumping in the vertical direction, thus meeting the usage requirements.
[0038] Furthermore, the movable plate 20 and the rotating rod 19 are rotatably connected. Compression springs 22 are sleeved on both ends of the guide rod 17 and on the outside of the two sets of movable blocks 18. The two ends of the compression springs 22 are fixedly connected to the guide rod 17 and the movable block 18, respectively. Damping springs 23 are fixedly connected to both ends of the top of the movable plate 20. The top of the damping springs 23 is fixedly connected to the connecting plate 16. The compression springs 22 drive the movable blocks 18 to move, causing the rotating rod 19 to move. In conjunction with the damping springs 23, the movable plate 20 is moved, allowing the multiple sets of limiting wheels 21 to move to the top of the gypsum board, limiting the gypsum board and enabling the gypsum board to move stably.
[0039] Furthermore, the cutting assembly 7 consists of a connecting frame 24, a connecting frame 25, a cutter 26, two sets of synchronous pulleys 27, a synchronous belt 28, multiple sets of limiting rods 29, and multiple sets of rollers 30. The connecting frame 24 is fixedly connected to the front end inside the connecting cover 2. The connecting frame 25 is slidably connected to the outside of the connecting frame 24. The cutter 26 is slidably connected to the bottom end of the connecting frame 25. Both sets of synchronous pulleys 27 are rotatably connected to both sides of the connecting frame 24. The synchronous belt 28 is located outside the two sets of synchronous pulleys 27. Multiple sets of limiting rods 29 are slidably connected to both ends of the connecting frame 24 and slidably connected to the inside of the connecting cover 2. The rollers 30 are rotatably connected to the bottom of the limiting rods 29. A return spring 31 is sleeved on the outside of the limiting rods 29. The two ends of the return spring 31 are fixedly connected to the limiting rods 29 and the connecting cover 2, respectively. A second telescopic cylinder is fixedly connected inside the connecting frame 25. The drive end of the retractable cylinder is fixedly connected to the cutter 26. The end of the connecting frame 24 away from the connecting frame 25 is fixedly connected to a drive motor. The drive end of the drive motor is fixedly connected to a set of synchronous pulleys 27. The connecting frame 25 is fixedly connected to the synchronous belt 28. Plasterboard is placed on top of the conveyor frame body 1 and moved to the inside of the connecting cover 2 by the conveyor frame body 1, contacting the edge sealing belt 6 to seal the plasterboard. When the plasterboard edge sealing is completed, the limit rod 29 is moved by the reset spring 31, so that the roller 30 limits the edge sealing belt 6. The drive motor is started, which drives the synchronous pulley 27 to rotate. The synchronous belt 28 drives another set of synchronous pulleys 27 to rotate, thereby causing the connecting frame 25 to move. The second telescopic cylinder is started to drive the cutter 26 to move, moving the cutter 26 out of the inside of the connecting frame 25 to cut the edge sealing belt 6.
[0040] In this embodiment, the specific implementation scenario is as follows: In actual use, the gypsum board is placed on top of the conveyor frame body 1. The conveyor frame body 1 moves to the inside of the connecting cover 2 and contacts the edge sealing strip 6. The first telescopic cylinder is activated, which drives the moving rod 14 to move, causing one set of moving frames 9 to move. This moves the guide rack 12 on its outer side, causing the guide gear 13 to rotate, which in turn moves another set of guide racks 12. This allows the two sets of moving frames 9 to move closer to each other. The displacement of multiple sets of bonding wheels 10 is adjusted according to the width of the gypsum board, so that the edge sealing strip 6 can be bonded to the surface of the gypsum board. The compression spring 22 drives the moving block 18 to move, causing the rotating rod 19 to move. This, in conjunction with the damping spring 23, drives the moving plate 20 to move. The displacement allows multiple sets of limiting wheels 21 to move to the top of the gypsum board, limiting the gypsum board and ensuring stable displacement to prevent vertical jumping, thus meeting usage requirements. When the gypsum board edge sealing is completed, the return spring 31 drives the limiting rod 29 to move, causing the roller 30 to limit the edge sealing strip 6. The drive motor is started, driving the synchronous wheel 27 to rotate. The synchronous belt 28 drives another set of synchronous wheels 27 to rotate, thereby causing the connecting frame 25 to move. The second telescopic cylinder is started, driving the cutter 26 to move out of the interior of the connecting frame 25 to cut the edge sealing strip 6. Compared with existing edge sealing devices, this utility model improves the overall stability of the edge sealing device through design.
[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An automatic rolling and cutting device for edge banding in the production of reinforced gypsum board, comprising a conveyor frame body (1), characterized in that: The top of the conveyor frame body (1) is provided with a connecting cover (2), the rear end of the connecting cover (2) is provided with a bonding component (3), the interior of the bonding component (3) is provided with a limiting component (4), both ends of the front end of the connecting cover (2) are fixedly connected with a connecting shell (5), the interior of the connecting shell (5) is provided with a sealing strip (6), and the front end of the interior of the connecting cover (2) is provided with a cutting component (7). The bonding assembly (3) is used to bond the edge banding tape (6) to the surface of the gypsum board. The bonding assembly (3) consists of a fixed plate (8), two sets of movable frames (9), multiple sets of bonding wheels (10), a fixed frame (11), and two sets of guide racks (12). The fixed plate (8) is fixedly connected to the rear end inside the connecting cover (2). The two sets of movable frames (9) are slidably connected to the two sides of the bottom of the fixed plate (8). The multiple sets of bonding wheels (10) are rotatably connected to the bottom of the inner side of the movable frame (9). The fixed frame (11) is fixedly connected to the middle of the bottom of the fixed plate (8). The guide racks (12) are fixedly connected to the top of the inner side of the movable frame (9). The limiting component (4) is used to limit the top of the gypsum board; The cutting component (7) is used to cut the edge banding tape (6).
2. The automatic rolling and cutting device for edge banding in the production of reinforced paper-faced gypsum board according to claim 1, characterized in that: Multiple sets of the bonding wheels (10) are distributed at equal intervals on the inner side of the movable frame (9). Both ends of the fixed frame (11) are rotatably connected to multiple balls. The guide rack (12) is slidably connected to the balls.
3. The automatic rolling and cutting device for edge banding in the production of reinforced paper-faced gypsum board according to claim 1, characterized in that: The guide gear (13) is rotatably connected in the middle of the inside of the fixed frame (11). The guide rack (12) is meshed with the guide gear (13). The two sets of guide racks (12) are symmetrically designed on the outside of the guide gear (13).
4. The automatic rolling and cutting device for edge banding in the production of reinforced paper-faced gypsum board according to claim 1, characterized in that: The top of the fixed plate (8) is fixedly connected to a first telescopic cylinder, and the drive end of the first telescopic cylinder is fixedly connected to a moving rod (14). The moving rod (14) is slidably connected to the fixed plate (8), and the moving rod (14) extends to the bottom of the fixed plate (8) and is fixedly connected to a set of moving frames (9).
5. The automatic rolling and cutting device for edge banding in the production of reinforced paper-faced gypsum board according to claim 1, characterized in that: Both ends of the bottom of the fixed plate (8) are fixedly connected to sliding rods (15), and the movable frame (9) is slidably connected to the sliding rods (15).
6. The automatic rolling and cutting device for edge banding in the production of reinforced paper-faced gypsum board according to claim 1, characterized in that: The limiting component (4) consists of a connecting plate (16), a guide rod (17), two sets of moving blocks (18), two sets of rotating rods (19), a moving plate (20), and multiple sets of limiting wheels (21). The connecting plate (16) is fixedly connected to the middle of the inner side of the moving frame (9). The guide rod (17) is fixedly connected to the bottom of the connecting plate (16). The two sets of moving blocks (18) are slidably connected to the two ends of the guide rod (17). The rotating rod (19) is rotatably connected to the bottom of the moving block (18). The moving plate (20) is located at the bottom of the two sets of rotating rods (19). The multiple sets of limiting wheels (21) are rotatably connected to the bottom of the moving plate (20).
7. The automatic rolling and cutting device for edge sealing in the production of reinforced paper-faced gypsum board according to claim 6, characterized in that: The movable plate (20) and the rotating rod (19) are rotatably connected. Both ends of the guide rod (17) and the outer sides of the two sets of movable blocks (18) are fitted with compression springs (22). The two ends of the compression springs (22) are fixedly connected to the guide rod (17) and the movable block (18) respectively.
8. The automatic rolling cutter for edge banding in the production of reinforced gypsum board according to claim 7, characterized in that: Damping springs (23) are fixedly connected to both ends of the top of the movable plate (20), and the top of the damping springs (23) is fixedly connected to the connecting plate (16).
9. The automatic rolling cutter for edge sealing in the production of reinforced paper-faced gypsum board according to claim 1, characterized in that: The cutting assembly (7) consists of a connecting frame (24), a connecting frame (25), a cutter (26), two sets of synchronous pulleys (27), a synchronous belt (28), multiple sets of limiting rods (29), and multiple sets of rollers (30). The connecting frame (24) is fixedly connected to the front end inside the connecting cover (2). The connecting frame (25) is slidably connected to the outside of the connecting frame (24). The cutter (26) is slidably connected to the bottom end of the connecting frame (25). The two sets of synchronous pulleys (27) are rotatably connected to both sides of the connecting frame (24). The synchronous belt (28) is located outside the two sets of synchronous pulleys (27). The multiple sets of limiting rods (29) are slidably connected to the outside of the two sets of synchronous pulleys (27). The roller (30) is rotatably connected to the bottom of the limiting rod (29) and slidably connected to the inside of the connecting cover (2). The limiting rod (29) is fitted with a return spring (31) on the outside. The two ends of the return spring (31) are fixedly connected to the limiting rod (29) and the connecting cover (2) respectively. The inside of the connecting frame (25) is fixedly connected to a second telescopic cylinder. The driving end of the second telescopic cylinder is fixedly connected to the cutter (26). The end of the connecting frame (24) away from the connecting frame (25) is fixedly connected to a drive motor. The driving end of the drive motor is fixedly connected to a set of synchronous pulleys (27).