Numerical control full-automatic fin forming machine

Abstract

The utility model relates to the technical field of fin production, and discloses a numerical control full-automatic fin forming machine which comprises a main body, a material box fixedly connected to the upper surface of the main body, a magnetic powder brake fixedly connected to the outer surface of the material box, a disc fixedly connected to the output end of the magnetic powder brake, raw materials installed in the main body, and the ends of the raw materials fixedly connected with the disc. The output end of the feeding motor penetrates through the main body and is fixedly connected with a transmission roller; a plurality of transition rollers are fixedly connected in the main body; a lifting ring is arranged in the main body in a sliding manner; one side of the lifting ring is rotationally connected with a lifting roller; a knife roll box is fixedly connected to the upper surface of the main body, a plurality of knife rolls are mounted in the knife roll box, raw material tension is controlled by adjusting the height of a lifting ring, and the height change of a lifting roll affects the raw material tension; the swing arm controls the height of the swing roller, changes the raw material path length and adjusts the bending degree and tension distribution.

Description

Technical Field

[0001] This utility model relates to the field of fin production technology, specifically to a CNC fully automatic fin forming machine. Background Technology

[0002] Fin forming machines are essential equipment in important fields such as automobile manufacturing and aircraft manufacturing. They are mainly used for forming heat dissipation products such as automotive radiators, air conditioners, and aircraft radiators. Traditional fin forming machines suffer from problems such as low manufacturing efficiency, high cost, and poor processing accuracy. Therefore, research on virtual design of fin forming machines is of great significance. Fin forming machines are widely used in industrial and mining enterprises, chemical enterprises, industrial workshops, power plants, ecological parks, and other fields. Choosing a fin forming machine as the main heating equipment is a wise choice.

[0003] A hydraulic forming machine for outer fins is mentioned in an existing Chinese patent (authorization announcement number: CN212238958U). It includes a base, a servo motor fixedly connected to the front of the base, a worktable fixedly connected to the top of the base, a connecting rod fixedly connected to one side of the worktable, a terminal block rotatably connected to the end of the connecting rod, an aluminum strip on the terminal block, a positioning plate fixedly connected above the worktable, a support rod on one side of the positioning plate, a guide roller rotatably connected to the support rod, the guide roller being rotatably connected to the output end of the servo motor via a synchronous belt, a pressure roller above the guide roller, the pressure roller being rotatably connected to the support rod, a forming box on one side of the support rod, and a slicing box on one side of the forming box. This utility model has a novel structure and reasonable design, can position the aluminum strip, preventing the aluminum strip from tilting during conveying and affecting the forming process, and the guide roller and pressure roller can remove impurities from the aluminum strip, preventing any impact on the forming quality.

[0004] In existing fin forming machines, the control of raw material tension is crucial to ensuring product quality and production efficiency. Excessive or insufficient tension will affect the composite product and the application environment. However, existing devices cannot adjust the tension in real time. Excessive tension usually leads to stretching and deformation of the raw material film, and in severe cases, even breakage. Improper tension control may cause problems such as wrinkling, white spots, and bubbles. Utility Model Content

[0005] The purpose of this application is to provide a CNC fully automatic fin forming machine to solve the problem that existing devices cannot adjust the tension in real time, and that excessive tension usually leads to the stretching and deformation of the raw material film.

[0006] To achieve the above objectives, this application specifically adopts the following technical solution:

[0007] A CNC fully automatic fin forming machine includes a main body. A material box is fixedly connected to the upper surface of the main body. A magnetic powder brake is fixedly connected to the inner surface of the material box. A disc of material is fixedly connected to the output end of the magnetic powder brake. Raw material is installed inside the main body, and the end of the raw material is fixedly connected to the disc of material. A feeding motor is fixedly connected inside the main body. A transmission roller is fixedly connected to the output end of the feeding motor through the main body. Several transition rollers are fixedly connected inside the main body. A lifting ring is slidably arranged inside the main body. A lifting roller is rotatably connected to one side of the lifting ring. A swing arm is rotatably connected inside the main body. A swing roller is rotatably connected to one end of the swing arm. A cutter roller box is fixedly connected to the upper surface of the main body. Several cutter rollers are installed inside the cutter roller box. A wave conveying roller is installed on the upper surface of the main body. An adjustment structure is provided inside the main body.

[0008] By adopting the above technical solution, when using this device for fin manufacturing, the magnetic powder brake is first started to feed the raw material from the material box. Then, the raw material is sequentially placed on several transition rollers, lifting rollers, transmission rollers, and swing rollers, and finally passes through the cutter roller box and the wave conveyor roller. As the raw material is continuously fed, it is driven by the transmission roller driven by the feeding motor to move towards the wave conveyor roller. Upon passing through the cutter roller box, it is cut off by the upper and lower cutter rollers within the box. When it is necessary to control the tension of the raw material, the height of the lifting ring can be adjusted by adjusting the structure. Changes in the height of the lifting ring will cause changes in the height of the lifting roller, thereby adjusting the tension between the lifting roller and the transmission roller. As the material tension changes, the tension decreases when the height of the lifting roller increases and increases when the height of the lifting roller decreases. By controlling the material tension and simultaneously controlling the swing arm through the adjustment structure, the height of the swing roller connected to one end of the swing arm also changes accordingly. The change in the height of the swing roller causes a change in the material path length between it and the adjacent transition roller or drive roller, thereby adjusting the curvature and tension distribution of the material as it passes through these rollers. This makes the material smoother when it is cut by the cutter roller, avoiding wrinkles or breakages caused by excessive or insufficient tension during cutting, thus improving the fin forming effect and enhancing the practicality of the device.

[0009] Furthermore, the adjustment structure includes a lifting motor fixedly connected inside the main body, a lifting screw fixedly connected to the output end of the lifting motor, the lower end of the lifting screw being rotatably connected to the main body, and the outer surface of the lifting screw being threadedly connected to a lifting ring.

[0010] By adopting the above technical solution, the lifting motor is started, and the output end of the lifting motor will drive the lifting screw to rotate. Since the lifting screw is threadedly connected to the lifting ring, the lifting ring will be driven to rise and fall during the rotation of the lifting screw.

[0011] Furthermore, the main body has a lifting groove inside, and the shape of the lifting groove is adapted to the lifting ring.

[0012] By adopting the above technical solution, the groove limits the movement trajectory of the lifting ring, making the movement of the lifting ring more stable.

[0013] Furthermore, a swing motor is fixedly connected inside the main body, a transmission gear is fixedly connected to the output end of the swing motor, a swing gear is rotatably connected inside the main body, the outer surfaces of the swing gear and the transmission gear mesh with each other, and the swing gear is fixedly connected to the swing arm inside.

[0014] By adopting the above technical solution, the swing motor is started, and the output end of the swing motor drives the transmission gear to rotate. When the transmission gear rotates, it drives the swing gear meshing with it to rotate. When the swing gear rotates, it drives the swing arm to swing.

[0015] Furthermore, an arc-shaped groove is formed on the outer surface of the main body, and a rotating wheel is rotatably connected to the end of the swing arm, the shape of which is adapted to the arc-shaped groove.

[0016] By adopting the above technical solution, when the swing arm swings, it will drive the wheel at its end to slide inside the arc groove, thereby achieving the effect of controlling the swing angle of the swing arm.

[0017] Furthermore, a cleaning motor is fixedly connected to the upper surface of the main body, and a bidirectional screw is fixedly connected to the output end of the cleaning motor. Both ends of the bidirectional screw are threadedly connected to a cleaning plate, and a felt pad is fixedly connected to one side of the cleaning plate.

[0018] By adopting the above technical solution, when the cleaning motor is started, the output end of the cleaning motor will drive the bidirectional screw to rotate. Since both ends of the bidirectional screw are threaded with cleaning plates, the two cleaning plates will move relative to each other during the rotation of the bidirectional screw. The cleaning plates move towards the upper and lower surfaces of the raw material and drive the felt pads on their sides to wipe and clean the surface of the raw material.

[0019] Furthermore, a guide rod is fixedly connected to the upper surface of the main body, and the outer surface of the guide rod is slidably connected to the cleaning plate.

[0020] By adopting the above technical solution, the cleaning plate will slide on the outer surface of the guide rod. The guide rod limits the movement trajectory of the cleaning plate, allowing the cleaning plate to move smoothly.

[0021] Furthermore, a collection groove is provided inside the cleaning plate, and a rotating column is rotatably connected inside the collection groove. A scraper is fixedly connected to the outer surface of the rotating column, and a torsion spring is sleeved on the outer side of the rotating column. The two ends of the torsion spring are fixedly connected to the cleaning plate and the scraper, respectively.

[0022] By adopting the above technical solution, the scraper will scrape the surface of the raw material during the movement of the raw material, scraping the impurities attached to the felt pad and the dust on the raw material into the collection tank for collection, thus avoiding the accumulation of impurities and dust on the raw material and affecting the cleaning effect.

[0023] In summary, this application includes at least one of the following beneficial effects;

[0024] 1. In this application, when adjusting the raw material tension and path, the lifting motor is started, and its output drives the lifting screw to rotate, the lifting ring rises and falls accordingly, and the lifting roller adjusts the tension synchronously; at the same time, the swing motor is started, the transmission gear rotates, the swing gear and swing arm swing accordingly, the rotating wheel slides in the arc groove to control the swing angle, and the swing roller adjusts the raw material path to ensure that the raw material passes through the cutter roller flat, avoiding wrinkles or breakage, improving the fin forming effect and the practicality of the device.

[0025] 2. In this application, after the cleaning motor is started, the bidirectional screw rotates and drives the cleaning plate to move relative to each other. The cleaning plate wipes the surface of the raw material to remove impurities and dust, thereby improving cleanliness. The guide rod limits the trajectory of the cleaning plate to ensure smooth movement. The scraper scrapes the surface when the raw material moves, collecting impurities and dust into the tank to prevent accumulation and affect cleaning. The torsion spring ensures that the scraper and the felt pad are in close contact to maintain the scraping effect. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of a fully automatic CNC fin forming machine according to this application;

[0027] Figure 2 This is a schematic diagram of the internal structure of a CNC fully automatic fin forming machine according to this application;

[0028] Figure 3 This is a cross-sectional view of the internal structure of a fully automatic CNC fin forming machine according to this application;

[0029] Figure 4 This is a partial sectional view of a CNC fully automatic fin forming machine according to this application;

[0030] Figure 5 This is a partial sectional view of the cleaning plate of a CNC fully automatic fin forming machine according to this application;

[0031] Figure 6 It is in this application Figure 1 Enlarged view of point A in the middle;

[0032] Figure 7 It is in this application Figure 5 Enlarged diagram of point B in the middle.

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. Main body; 2. Material box; 3. Raw material; 4. Transition roller; 5. Lifting roller; 6. Swinging roller; 7. Swinging arm; 8. Arc groove; 9. Knife roller box; 10. Wave conveying roller; 11. Magnetic powder brake; 12. Feeding motor; 13. Swinging gear; 14. Transmission gear; 15. Swinging motor; 16. Lifting motor; 17. Lifting screw; 18. Lifting ring; 19. Lifting groove; 20. Rotary wheel; 21. Felt pad; 22. Scraper; 23. Cleaning motor; 24. Bidirectional screw; 25. Guide rod; 26. Rotating column; 27. Torsion spring; 28. Collection trough; 29. ​​Cleaning plate; 30. Transmission roller; 31. Disc. Detailed Implementation

[0035] The following will be based on the embodiments of this utility model. Figures 1-7 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] Reference Figure 1 and Figure 2 , Figure 3 , Figure 4 This utility model provides a technical solution: a CNC fully automatic fin forming machine, including a main body 1, a material box 2 fixedly connected to the upper surface of the main body 1, a magnetic powder brake 11 fixedly connected to the inner surface of the material box 2, a disc material 31 fixedly connected to the output end of the magnetic powder brake 11, raw material 3 installed inside the main body 1, the end of the raw material 3 fixedly connected to the disc material 31, a feeding motor 12 fixedly connected inside the main body 1, a transmission roller 30 fixedly connected to the output end of the feeding motor 12 through the main body 1, a plurality of transition rollers 4 fixedly connected inside the main body 1, a lifting ring 18 slidably arranged inside the main body 1, a lifting roller 5 rotatably connected to one side of the lifting ring 18, a swing arm 7 rotatably connected inside the main body 1, a swing roller 6 rotatably connected to one end of the swing arm 7, a cutter roller box 9 fixedly connected to the upper surface of the main body 1, a plurality of cutter rollers installed inside the cutter roller box 9, a wave conveying roller 10 installed on the upper surface of the main body 1, and an adjustment structure provided inside the main body 1.

[0037] When using this device for fin manufacturing, the magnetic powder brake 11 is first activated to feed the raw material 3 from the material box 2. The raw material 3 is then sequentially placed on several transition rollers 4, lifting rollers 5, transmission rollers 30, and swing rollers 6, and finally passes through the cutter roller box 9 and the wave conveyor roller 10. As the raw material 3 is continuously fed, it is driven by the transmission roller 30 driven by the feeding motor 12 to move towards the wave conveyor roller 10. Upon passing through the cutter roller box 9, it is cut off by the upper and lower cutter rollers within the box. When tension control of the raw material 3 is required, the height of the lifting ring 18 can be adjusted using an adjustment mechanism. Changes in the height of the lifting ring 18 will cause changes in the height of the lifting roller 5, thereby adjusting the tension between the lifting roller 5 and the transmission roller 30. The tension of the raw material 3 changes. When the height of the lifting roller 5 increases, the tension of the raw material 3 decreases. When the height of the lifting roller 5 decreases, the tension of the raw material 3 increases. By controlling the tension of the raw material 3, and simultaneously controlling the swing arm 7 through the adjustment structure, the height of the swing roller 6 connected to one end of the swing arm 7 also changes accordingly. The change in the height of the swing roller 6 causes the path length of the raw material 3 between it and the adjacent transition roller 4 or transmission roller 30 to change, thereby adjusting the curvature and tension distribution of the raw material 3 when passing through these rollers. This makes the raw material 3 flatter when it is cut by the cutter roller, avoiding wrinkles or breakage of the raw material 3 during cutting due to excessive or insufficient tension. This improves the fin forming effect and enhances the practicality of the device.

[0038] Reference Figure 2 and Figure 3 , Figure 4 The adjustment structure includes a lifting motor 16 fixedly connected inside the main body 1. A lifting screw 17 is fixedly connected to the output end of the lifting motor 16. The lower end of the lifting screw 17 is rotatably connected to the main body 1, and the outer surface of the lifting screw 17 is threadedly connected to a lifting ring 18. A lifting groove 19 is provided inside the main body 1, and the shape of the lifting groove 19 is adapted to the lifting ring 18. A swing motor 15 is fixedly connected inside the main body 1. A transmission gear 14 is fixedly connected to the output end of the swing motor 15. A swing gear 13 is rotatably connected inside the main body 1. The outer surfaces of the swing gear 13 and the transmission gear 14 mesh with each other, and the swing gear 13 is fixedly connected to the swing arm 7. An arc-shaped groove 8 is provided on the outer surface of the main body 1. A rotating wheel 20 is rotatably connected to the end of the swing arm 7, and the shape of the rotating wheel 20 is adapted to the arc-shaped groove 8.

[0039] When it is necessary to adjust the tension and path of raw material 3, the lifting motor 16 is first started. The output end of the lifting motor 16 drives the lifting screw 17 to rotate. Since the lifting screw 17 is threadedly connected to the lifting ring 18, and the lifting groove 19 limits the movement trajectory of the lifting ring 18, the lifting screw 17 will drive the lifting ring 18 to rise and fall during rotation. When the lifting ring 18 rises and falls, it will drive the lifting roller 5 to rise and fall synchronously, thereby achieving the effect of adjusting the tension of raw material 3. At the same time, the swing motor 15 is started. The output end of the swing motor 15 drives the transmission gear 14 to rotate. When the transmission gear 14 rotates, it will drive the gear meshing with it. The oscillating gear 13 rotates, which drives the oscillating arm 7 to oscillate. When the oscillating arm 7 oscillates, it drives the rotating wheel 20 at its end to slide inside the arc-shaped groove 8, thereby controlling the oscillation angle of the oscillating arm 7. When the oscillating arm 7 oscillates, it drives the oscillating roller 6 to oscillate, thereby adjusting the path of the raw material 3. This adjusts the curvature and tension distribution of the raw material 3 as it passes through these rollers, making the raw material 3 flatter when it is cut by the cutter roller. This avoids wrinkles or breakage of the raw material 3 during cutting due to excessive or insufficient tension, thereby improving the fin forming effect and enhancing the practicality of the device.

[0040] Reference Figure 5 and Figure 6 , Figure 7 A cleaning motor 23 is fixedly connected to the upper surface of the main body 1. A bidirectional screw 24 is fixedly connected to the output end of the cleaning motor 23. A cleaning plate 29 is threaded to both ends of the bidirectional screw 24. A felt pad 21 is fixedly connected to one side of the cleaning plate 29. A guide rod 25 is fixedly connected to the upper surface of the main body 1. The outer surface of the guide rod 25 is slidably connected to the cleaning plate 29. A collection groove 28 is opened inside the cleaning plate 29. A rotating column 26 is rotatably connected inside the collection groove 28. A scraper 22 is fixedly connected to the outer surface of the rotating column 26. A torsion spring 27 is sleeved on the outer side of the rotating column 26. The two ends of the torsion spring 27 are fixedly connected to the cleaning plate 29 and the scraper 22, respectively.

[0041] When raw material 3 moves, the cleaning motor 23 is started first. The output end of the cleaning motor 23 drives the bidirectional screw 24 to rotate. Since cleaning plates 29 are threaded to both ends of the bidirectional screw 24, the rotation of the bidirectional screw 24 will drive the two cleaning plates 29 to move relative to each other. The cleaning plates 29 move towards the upper and lower surfaces of the raw material 3 and drive the felt pads 21 on their sides to wipe and clean the surface of the raw material 3, effectively removing impurities and dust from the surface of the raw material 3 and improving the cleanliness of the raw material 3. At the same time, the movement of the cleaning plates 29 will slide on the outer surface of the guide rod 25. The guide rod 25 limits the movement trajectory of the cleaning plate 29, allowing it to move smoothly and preventing it from shifting or shaking during movement. The scraper 22 scrapes the surface of the raw material 3 during its movement, scraping impurities attached to the felt pad 21 and dust from the raw material 3 into the collection trough 28 for collection. This prevents impurities and dust from accumulating on the raw material 3 and affecting the cleaning effect. The torsion spring 27 ensures that the scraper 22 is always in close contact with the surface of the felt pad 21, guaranteeing the scraping effect.

[0042] Working principle: When it is necessary to adjust the tension and path of raw material 3, the lifting motor 16 is started first. The output end of the lifting motor 16 drives the lifting screw 17 to rotate. Since the lifting screw 17 is threadedly connected to the lifting ring 18, and the lifting groove 19 limits the movement trajectory of the lifting ring 18, the lifting screw 17 will drive the lifting ring 18 to rise and fall during rotation. When the lifting ring 18 rises and falls, it will drive the lifting roller 5 to rise and fall synchronously, thereby achieving the effect of adjusting the tension of raw material 3. At the same time, the swing motor 15 is started. The output end of the swing motor 15 drives the transmission gear 14 to rotate. When the transmission gear 14 rotates, it will drive the roller 5 to rise and fall synchronously. The meshing oscillating gear 13 rotates, which drives the oscillating arm 7 to oscillate. When the oscillating arm 7 oscillates, it drives the rotating wheel 20 at its end to slide inside the arc groove 8, thereby controlling the oscillation angle of the oscillating arm 7. When the oscillating arm 7 oscillates, it drives the oscillating roller 6 to oscillate, thereby adjusting the path of the raw material 3. This adjusts the curvature and tension distribution of the raw material 3 as it passes through these rollers, making the raw material 3 flatter when it is cut by the cutter roller. This avoids wrinkles or breakage of the raw material 3 during cutting due to excessive or insufficient tension, thereby improving the fin forming effect and enhancing the practicality of the device.

[0043] When raw material 3 moves, the cleaning motor 23 is started first. The output end of the cleaning motor 23 drives the bidirectional screw 24 to rotate. Since cleaning plates 29 are threaded to both ends of the bidirectional screw 24, the rotation of the bidirectional screw 24 will drive the two cleaning plates 29 to move relative to each other. The cleaning plates 29 move towards the upper and lower surfaces of the raw material 3 and drive the felt pads 21 on their sides to wipe and clean the surface of the raw material 3, effectively removing impurities and dust from the surface of the raw material 3 and improving the cleanliness of the raw material 3. At the same time, the movement of the cleaning plates 29 will slide on the outer surface of the guide rod 25. The guide rod 25 limits the movement trajectory of the cleaning plate 29, allowing it to move smoothly and preventing it from shifting or shaking during movement. The scraper 22 scrapes the surface of the raw material 3 during its movement, scraping impurities attached to the felt pad 21 and dust from the raw material 3 into the collection trough 28 for collection. This prevents impurities and dust from accumulating on the raw material 3 and affecting the cleaning effect. The torsion spring 27 ensures that the scraper 22 is always in close contact with the surface of the felt pad 21, guaranteeing the scraping effect.

[0044] 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. A CNC fully automatic fin forming machine, comprising a main body (1), characterized in that: A material box (2) is fixedly connected to the upper surface of the main body (1). A magnetic powder brake (11) is fixedly connected to the inner surface of the material box (2). A disc of material (31) is fixedly connected to the output end of the magnetic powder brake (11). Raw material (3) is installed inside the main body (1). The end of the raw material (3) is fixedly connected to the disc of material (31). A feeding motor (12) is fixedly connected inside the main body (1). A transmission roller (30) is fixedly connected to the output end of the feeding motor (12) through the main body (1). A number of transition rollers (4) are connected. A lifting ring (18) is slidably arranged inside the main body (1). A lifting roller (5) is rotatably connected to one side of the lifting ring (18). A swing arm (7) is rotatably connected inside the main body (1). A swing roller (6) is rotatably connected to one end of the swing arm (7). A cutter roller box (9) is fixedly connected to the upper surface of the main body (1). A number of cutter rollers are installed inside the cutter roller box (9). A wave transmission roller (10) is installed on the upper surface of the main body (1). An adjustment structure is provided inside the main body (1).

2. The CNC fully automatic fin forming machine according to claim 1, characterized in that: The adjustment structure includes a lifting motor (16) fixedly connected inside the main body (1), and a lifting screw (17) fixedly connected to the output end of the lifting motor (16). The lower end of the lifting screw (17) is rotatably connected to the main body (1), and the outer surface of the lifting screw (17) is threadedly connected to the lifting ring (18).

3. The CNC fully automatic fin forming machine according to claim 2, characterized in that: The main body (1) has a lifting groove (19) inside, and the shape of the lifting groove (19) is adapted to the lifting ring (18).

4. The CNC fully automatic fin forming machine according to claim 2, characterized in that: The main body (1) is fixedly connected to a swing motor (15), and the output end of the swing motor (15) is fixedly connected to a transmission gear (14). The main body (1) is rotatably connected to a swing gear (13), and the outer surfaces of the swing gear (13) and the transmission gear (14) mesh with each other. The swing gear (13) is fixedly connected to the swing arm (7).

5. The CNC fully automatic fin forming machine according to claim 4, characterized in that: The outer surface of the main body (1) is provided with an arc groove (8), and the end of the swing arm (7) is rotatably connected to a wheel (20), the shape of which is adapted to the arc groove (8).

6. The CNC fully automatic fin forming machine according to claim 2, characterized in that: A cleaning motor (23) is fixedly connected to the upper surface of the main body (1). A bidirectional screw (24) is fixedly connected to the output end of the cleaning motor (23). A cleaning plate (29) is threaded to both ends of the bidirectional screw (24). A felt pad (21) is fixedly connected to one side of the cleaning plate (29).

7. A CNC fully automatic fin forming machine according to claim 6, characterized in that: A guide rod (25) is fixedly connected to the upper surface of the main body (1), and the outer surface of the guide rod (25) is slidably connected to the cleaning plate (29).

8. The CNC fully automatic fin forming machine according to claim 7, characterized in that: The cleaning plate (29) has a collection groove (28) inside, and a rotating column (26) is rotatably connected inside the collection groove (28). A scraper (22) is fixedly connected to the outer surface of the rotating column (26). A torsion spring (27) is sleeved on the outer side of the rotating column (26). The two ends of the torsion spring (27) are fixedly connected to the cleaning plate (29) and the scraper (22) respectively.

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