Roller surface cleaning device and method of use

Abstract

This invention relates to a roller surface cleaning device and its usage method, belonging to the technical field of strip steel production equipment and methods in the metallurgical industry. The technical solution of this invention is as follows: a compressed air fixing device is installed on the front base plate (1) and the rear base plate (2); a support device is arranged on both sides of the front base plate (1) and the rear base plate (2), and welded to them; a walking device is installed on the outside of the front support plate (3) and the rear support plate (5); a spraying device is arranged at the front end of the front base plate (1); the brushing device consists of a coarse brush roller device and a fine brush roller device, with the coarse brush roller device arranged at the rear end of the front base plate (1) and the fine brush roller device arranged at the front end of the rear base plate (2); a dust extraction and drying device is arranged at the rear end of the rear base plate (2). The beneficial effects of this invention are: it can perform non-destructive cleaning of the roller surface, achieving the purpose of low labor intensity, excellent cleaning effect, and wide applicability.

Description

Technical Field

[0001] This invention relates to a rolling mill roll surface cleaning device and its usage method, belonging to the technical field of strip steel production equipment and methods in the metallurgical industry. Background Technology

[0002] In the metallurgical industry, rolling mill rolls are the most important rotating equipment in the strip steel production process. Because they are in direct contact with the strip steel, the quality of the roll surface directly affects the quality of the strip steel. Prolonged rolling can cause metal residues to adhere to the roll surface. If not cleaned regularly, these residues will solidify on the roll surface, leading to a deterioration in the surface quality of the strip steel. Traditional roll cleaning methods involve one or more operators manually cleaning the rolls during maintenance, wiping along the roll surface. The problems with this method are that the cleaning effect is generally poor, it is time-consuming and labor-intensive, and some areas cannot be cleaned. Summary of the Invention

[0003] The purpose of this invention is to provide a roller surface cleaning device and its usage method. The cleaning process is achieved by a combination of image acquisition, spraying mechanism, cleaning mechanism, dust extraction and drying mechanism, support mechanism and walking mechanism. Compressed air is used to provide pressure perpendicular to the roller surface to the base of the cleaning device, ensuring that the cleaning device can completely adhere to the roller surface and perform non-destructive cleaning of the roller surface. This achieves the goals of low labor intensity, excellent cleaning effect and wide applicability, effectively solving the above-mentioned problems existing in the background technology.

[0004] The technical solution of the present invention is: a roller surface cleaning device, comprising a front base plate, a rear base plate, a support device, a camera, a spraying device, a brushing device, a dust extraction and drying device, a walking device, and a compressed air fixing device. The compressed air fixing device is disposed on the front base plate and the rear base plate; the support device is arranged on both sides of the front base plate and the rear base plate and welded to the front base plate and the rear base plate; the support device includes a front support plate, left and right support plates and a rear support plate; the walking device is disposed on the outer side of the front support plate and the rear support plate; the camera is fixed at the middle position on the outer side of the front support plate; the spraying device is arranged at the front end of the front base plate; the brushing device consists of a coarse brush roller device and a fine brush roller device, the coarse brush roller device is arranged at the rear end of the front base plate and the fine brush roller device is arranged at the front end of the rear base plate; the dust extraction and drying device is arranged at the rear end of the rear base plate and consists of a dust extraction chamber and a drying pipe.

[0005] The compressed air fixing device includes a compressed air stabilizing connector, a spring fork, a support wheel axle, and a leather support wheel. The compressed air stabilizing connector is triangularly welded to the upper side of the front and rear bottom plates. The spring fork is arranged directly below the compressed air stabilizing connector and is fixed to the lower side of the front and rear bottom plates by threaded connection. The leather support wheel is fixed to the spring fork by the support wheel axle.

[0006] The structure of the walking device is as follows: a sliding groove is welded and fixed to the outside of the front support plate and the rear support plate; two sliders are located inside the sliding groove; the connection structure between the two sliders and the sliding groove is symmetrical and identical; a spring is installed between the left side of the left slider and the inner wall of the sliding groove; a stop block is installed on the inner wall of the sliding groove on the right side of the left slider; the upper ends of the two connecting rods are connected to the two sliders respectively through cylindrical pins; the two connecting rods are hinged together at the middle position; the lower ends of the two connecting rods are respectively hinged to the upper side of the support rod; the walking wheel is fixed to the lower side of the support rod through the support shaft; a walking motor is fixed to the outside of the support rod by bolts; the output shaft of the walking motor and the support shaft are driven by bevel gear meshing.

[0007] The camera is fixed between two sliding grooves on the outside of the front support plate.

[0008] The front base plate has rectangular spray holes, the spray pipe is welded and fixed to the rectangular spray holes, the spray nozzle is connected to the end of the spray pipe by a thread, and the spray nozzle is arranged at a 60° angle to the front base plate.

[0009] The coarse brush roller device has the following structure: a rectangular coarse brush roller hole is opened in the front base plate; the coarse brush roller mudguard is completely welded to the edge of the rectangular coarse brush roller hole; the coarse brush roller bearing seat is arranged on both sides of the coarse brush roller mudguard to fix the coarse brush roller bearing; the coarse brush roller bearing supports the rotation of the coarse brush roller; the coarse brush roller motor is fixed on the left side of the coarse brush roller mudguard; the output shaft of the coarse brush roller motor and the coarse brush roller bearing are driven by the meshing of a helical gear; a large pulley is installed on the coarse brush roller bearing.

[0010] The structure of the fine brush roller device is as follows: a rectangular fine brush roller hole is opened in the rear bottom plate, the fine brush roller mudguard is completely welded to the edge line of the rectangular fine brush roller hole in the rear bottom plate, the fine brush roller bearing seat is arranged on both sides of the fine brush roller mudguard to fix the fine brush roller bearing, the fine brush roller bearing supports the rotation of the fine brush roller; a small pulley is installed on the fine brush roller bearing, and the small pulley and the large pulley are connected by a belt.

[0011] The coarse and fine brush rollers are made of rubber and are installed slightly below the upper and lower base plates.

[0012] The dust collection chamber includes a vacuum chamber and a dust collection pipe. A rectangular dust collection hole is opened on the rear bottom plate. The vacuum chamber is completely welded to the edge of the rectangular dust collection hole. A leather plate is installed on the lower side of the vacuum chamber. The dust collection pipe is welded to the middle of the vacuum chamber.

[0013] The rear bottom plate has rectangular air drying holes. The air drying pipe is welded and fixed to the edge of the air drying hole. The air drying nozzle is connected to the air drying pipe by threads. The air drying nozzle is arranged perpendicular to the rear bottom plate.

[0014] It also includes an adjustment plate and anti-rollover blocks. The adjustment plate is installed between the front and rear base plates, and the positioning pins of the adjustment plate are inserted into the positioning holes of the front and rear base plates. The anti-rollover blocks are set on both sides of the adjustment plate.

[0015] A method of using a roll surface cleaning device includes the following steps:

[0016] (1) Preparation stage: Place the brushing device on the top of the roll, turn on the compressed air switch, and the compressed air reaches the compressed air connection pipe through the pipeline to increase the injection volume, so that the leather support wheels on the front and rear bottom plates are in contact with the roll surface, control the roll to rotate at low speed, and the leather support wheels start to move.

[0017] (2) Cleaning Stage: After completing the preparation stage, continue increasing the compressed air injection until the coarse and fine brush rollers contact the roll surface, then stop the injection. The cleaning fluid pumped from the remote pump is sprayed onto the roll surface through spray pipes and nozzles. Simultaneously, the coarse brush roller motor starts running, driving the coarse brush roller for coarse brushing. As the coarse brush roller rotates, the belt drives the fine brush roller to rotate, thus performing fine brushing. At this time, the vacuum drying device starts working, powered by the remote vacuum cleaner head motor, sucking the residual cleaning fluid and cleaned impurities from the roll surface back into the tank through the vacuum chamber and pipelines, and spraying dry compressed air onto the roll surface through pipelines and nozzles. The camera transmits the roll surface condition back to the handheld controller in real time to determine the brushing status.

[0018] (3) Moving Stage: After determining that the current track has been cleaned, the roller stops rotating, the compressed air supply to the compressed air connection pipe is closed, and the vent valve is opened. At the same time, the vent valve of the traveling device is closed, and the air inlet valve of the compressed air is opened. Air begins to enter the outside of the slider air chamber and moves towards the slide block. The traveling wheels are leather traveling wheels, which fall in an arc shape with the support rod until the cleaning device is completely supported on the roller surface, maintaining a constant pressure. Then the traveling motor starts running, driving the entire cleaning device to move to the next cleaning track. After moving to the next cleaning track, the air inlet of the traveling device is closed, the air outlet is opened, the compressed spring is restored, driving the slider to move to both sides, and the leather traveling wheels rise in an arc shape with the support rod, finally being completely lifted away from the roller surface.

[0019] (4) Repeat the preparation, cleaning and moving stages until the cleaning is completed.

[0020] The beneficial effects of this invention are: cleaning is performed by a combination of image acquisition, spraying mechanism, cleaning mechanism, dust extraction and drying mechanism, support mechanism and walking mechanism. Compressed air is used to provide pressure perpendicular to the roller surface to the base of the cleaning device, ensuring that the cleaning device can be completely attached to the surface of the roller, and can perform non-destructive cleaning of the roller surface, so as to achieve the purpose of low labor intensity, good cleaning effect and wide applicability. Attached Figure Description

[0021] Figure 1 This is the front view of the present invention;

[0022] Figure 2 This is a top view of the present invention;

[0023] Figure 3 This is the left view of the present invention;

[0024] Figure 4 This is a three-dimensional assembly drawing of the present invention;

[0025] In the diagram: 1. Front base plate; 2. Rear base plate; 3. Front support plate; 4. Left and right support plates; 5. Rear support plate; 6. Cover plate; 7. Camera; 8. Slide rail; 9. Spring; 10. Slider; 11. Stop block; 12. Vent; 13. Inlet; 14. Cylindrical pin; 15. Connecting rod; 16. Support rod; 17. Support shaft; 18. Traveling wheel; 19. Traveling motor; 20. Bevel gear; 21. Protective cover; 22. Spray pipe; 23. Spray nozzle; 24. Coarse brush roller mudguard; 25. Coarse brush roller bearing seat; 6. Coarse brush roller bearing seat. 26. Roller bearing; 27. Coarse brush roller; 28. Coarse brush roller motor; 29. ​​Helical gear; 30. Large pulley; 31. Belt; 32. Adjusting plate; 33. Anti-tipping block; 34. Small pulley; 35. Fine brush roller bearing seat; 36. Fine brush roller bearing; 37. Fine brush roller mudguard; 38. Fine brush roller; 39. Vacuum chamber support plate; 40. Leather plate; 41. Dust suction pipe; 42. Air drying pipe; 43. Air drying nozzle; 44. Compressed air stabilizing connector; 45. Spring fork; 46. Support wheel axle; 47. Leather support wheel. Implementation

[0026] To make the purpose, technical solutions, and advantages of the invention's embodiments clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only a small part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0027] A roller surface cleaning device includes a front base plate 1, a rear base plate 2, a support device, a camera 7, a spray device, a brushing device, a dust extraction and drying device, a walking device, and a compressed air fixing device. The compressed air fixing device is installed on the front base plate 1 and the rear base plate 2. The support device is arranged on both sides of the front base plate 1 and the rear base plate 2 and welded to the front base plate 1 and the rear base plate 2. The support device includes a front support plate 3, left and right support plates 4 and a rear support plate 5. The walking device is located on the outer side of the front support plate 3 and the rear support plate 5. The camera 7 is fixed at the middle position on the outer side of the front support plate 3. The spray device is arranged at the front end of the front base plate 1. The brushing device consists of a coarse brush roller device and a fine brush roller device. The coarse brush roller device is arranged at the rear end of the front base plate 1, and the fine brush roller device is arranged at the front end of the rear base plate 2. The dust extraction and drying device is arranged at the rear end of the rear base plate 2 and consists of a dust extraction chamber and a drying pipe 42.

[0028] The compressed air fixing device includes a compressed air stabilizing connector 44, a spring fork 45, a support wheel axle 46, and a leather support wheel 47. The compressed air stabilizing connector 44 is triangularly welded to the upper side of the front base plate 1 and the rear base plate 2. The spring fork 45 is arranged directly below the compressed air stabilizing connector 44. The spring fork 45 is fixed to the lower side of the front base plate 1 and the rear base plate 2 by a threaded connection. The leather support wheel 47 is fixed to the spring fork 45 by the support wheel axle 46.

[0029] The structure of the walking device is as follows: the slide groove 8 is welded and fixed to the outside of the front support plate 3 and the rear support plate 5. Two sliders 10 are located inside the slide groove 8. The connection structure between the two sliders 10 and the slide groove 8 is symmetrical and identical. A spring 9 is installed between the left side of the left slider and the inner wall of the slide groove 8. A stop block 11 is installed on the inner wall of the slide groove 8 on the right side of the left slider. The upper ends of the two connecting rods 15 are connected to the two sliders 10 through cylindrical pins 14 respectively. The two connecting rods 15 are hinged together at the middle position. The lower ends of the two connecting rods 15 are hinged to the upper side of the support rod 16 respectively. The walking wheel 18 is fixed to the lower side of the support rod 16 through the support shaft 17. The walking motor 19 is fixed to the outside of the support rod 16 by bolts. The output shaft of the walking motor 19 and the support shaft 17 are driven by bevel gear 20.

[0030] The camera 7 is fixed between the two sliding grooves 8 on the outside of the front support plate 3.

[0031] The front base plate 1 has rectangular spray holes, the spray pipe 22 is welded and fixed to the rectangular spray holes, the spray nozzle 23 is connected to the spray pipe 22 by threads, and the spray nozzle 23 is arranged at a 60° angle to the front base plate 1.

[0032] The structure of the coarse brush roller device is as follows: a rectangular coarse brush roller hole is opened in the front base plate 1, the coarse brush roller baffle 24 is completely welded to the edge line of the rectangular coarse brush roller hole, the coarse brush roller bearing seat 25 is arranged on both sides of the coarse brush roller baffle 24 to fix the coarse brush roller bearing 26, the coarse brush roller bearing 26 supports the rotation of the coarse brush roller 27; the coarse brush roller motor 28 is fixed on the left side of the coarse brush roller baffle 24, and the output shaft of the coarse brush roller motor 28 and the coarse brush roller bearing 26 are driven by meshing of the helical gear 29; a large pulley 30 is installed on the coarse brush roller bearing 26.

[0033] The structure of the fine brush roller device is as follows: a rectangular fine brush roller hole is opened in the rear base plate 2, the fine brush roller baffle 37 is completely welded to the edge line of the rectangular fine brush roller hole in the rear base plate, the fine brush roller bearing seat 35 is arranged on both sides of the fine brush roller baffle 37 to fix the fine brush roller bearing 36, the fine brush roller bearing 36 supports the rotation of the fine brush roller 38; a small pulley 34 is installed on the fine brush roller bearing 36, and the small pulley 34 and the large pulley 30 are connected by a belt 31.

[0034] The coarse brush roller 27 and the fine brush roller 38 are made of rubber rollers and are installed at a position slightly lower than the upper base plate 1 and the lower base plate 2.

[0035] The dust collection chamber includes a vacuum chamber and a dust collection pipe 41. A rectangular dust collection hole is opened on the rear bottom plate 2. The vacuum chamber is completely welded to the edge of the rectangular dust collection hole. A leather plate 40 is installed on the lower side of the vacuum chamber. The dust collection pipe 41 is welded to the middle position of the vacuum chamber.

[0036] The rear bottom plate 2 has a rectangular air drying hole. The air drying pipe 42 is welded and fixed to the edge of the air drying hole. The air drying nozzle 43 is connected to the air drying pipe 42 by a thread. The air drying nozzle 43 is arranged perpendicular to the rear bottom plate 2.

[0037] It also includes an adjusting plate 32 and an anti-tipping block 33. The adjusting plate 32 is installed between the front base plate 1 and the rear base plate 2. The positioning pins of the adjusting plate 32 are inserted into the positioning holes of the front base plate 1 and the rear base plate 2. The anti-tipping block 33 is arranged on both sides of the adjusting plate 32.

[0038] A camera is installed at the center of the outer side of the front support plate to capture images of the roll surface quality and transmit the captured images to a handheld controller. The spraying device is located at the front, the brushing device in the middle, the dust extraction and drying device at the rear, and the support devices are located on both sides of the front and rear base plates, fully connected to them. The walking device is located on the outer side of the front and rear support plates.

[0039] A method of using a roll surface cleaning device includes the following steps:

[0040] (1) Preparation stage: Place the brushing device on the top of the roll, turn on the compressed air switch, and the compressed air reaches the compressed air connection pipe through the pipeline to increase the injection volume, so that the leather support wheels on the front and rear bottom plates are in contact with the roll surface, control the roll to rotate at low speed, and the leather support wheels start to move.

[0041] (2) Cleaning Stage: After completing the preparation stage, continue increasing the compressed air injection until the coarse and fine brush rollers contact the roll surface, then stop the injection. The cleaning fluid pumped from the remote pump is sprayed onto the roll surface through spray pipes and nozzles. Simultaneously, the coarse brush roller motor starts running, driving the coarse brush roller for coarse brushing. As the coarse brush roller rotates, the belt drives the fine brush roller to rotate, thus performing fine brushing. At this time, the vacuum drying device starts working, powered by the remote vacuum cleaner head motor, sucking the residual cleaning fluid and cleaned impurities from the roll surface back into the tank through the vacuum chamber and pipelines, and spraying dry compressed air onto the roll surface through pipelines and nozzles. The camera transmits the roll surface condition back to the handheld controller in real time to determine the brushing status.

[0042] (3) Moving Stage: After determining that the current track has been cleaned, the roller stops rotating, the compressed air supply to the compressed air connection pipe is closed, and the vent valve is opened. At the same time, the vent valve of the traveling device is closed, and the air inlet valve of the compressed air is opened. Air begins to enter the outside of the slider air chamber and moves towards the slide block. The traveling wheels are leather traveling wheels, which fall in an arc shape with the support rod until the cleaning device is completely supported on the roller surface, maintaining a constant pressure. Then the traveling motor starts running, driving the entire cleaning device to move to the next cleaning track. After moving to the next cleaning track, the air inlet of the traveling device is closed, the air outlet is opened, the compressed spring is restored, driving the slider to move to both sides, and the leather traveling wheels rise in an arc shape with the support rod, finally being completely lifted away from the roller surface.

[0043] (4) Repeat the preparation, cleaning and moving stages until the cleaning is completed.

[0044] Two walking devices are arranged at both ends of the outer side of the front support plate, one walking device is arranged in the middle of the rear support plate, and two walking devices are arranged at both ends of the outer side of the rear support plate.

[0045] The camera is fixed between two sliding grooves on the outside of the front support plate.

[0046] In practical applications, the invention is placed directly above the roll, and compressed air is used to provide pressure perpendicular to the roll surface to the front and rear base plates, ensuring that the invention can be completely adhered to the roll surface. The working process is divided into three stages: preparation, cleaning, and movement.

Claims

1. A rolling mill roll surface cleaning device, characterized in that: The device includes a front base plate (1), a rear base plate (2), a support device, a camera (7), a spray device, a brushing device, a dust extraction and drying device, a walking device, and a compressed air fixing device. The compressed air fixing device is installed on the front base plate (1) and the rear base plate (2). The support device is arranged on both sides of the front base plate (1) and the rear base plate (2) and is welded to the front base plate (1) and the rear base plate (2). The support device includes a front support plate (3), left and right support plates (4) and a rear support plate (5). The walking device is located on the outside of the front support plate (3) and the rear support plate (5). The camera (7) is fixed in the middle position on the outside of the front support plate (3). The spray device is arranged at the front end of the front base plate (1). The brushing device consists of a coarse brush roller device and a fine brush roller device. The coarse brush roller device is arranged at the rear end of the front base plate (1), and the fine brush roller device is arranged at the front end of the rear base plate (2); the dust suction and drying device is arranged at the rear end of the rear base plate (2), and consists of a dust suction chamber and a drying pipe (42); the compressed air fixing device includes a compressed air stabilizing connector (44), a spring fork (45), a support wheel axle (46) and a leather support wheel (47). The compressed air stabilizing connector (44) is welded in a triangular shape on the upper side of the front base plate (1) and the rear base plate (2). The spring fork (45) is arranged directly below the compressed air stabilizing connector (44). The spring fork (45) is fixed to the lower side of the front base plate (1) and the rear base plate (2) by a threaded connection. The leather support wheel (47) is fixed to the spring fork (45) by the support wheel axle (46). It also includes an adjusting plate (32) and an anti-rollover block (33). The adjusting plate (32) is installed between the front bottom plate (1) and the rear bottom plate (2). The positioning pins of the adjusting plate (32) are inserted into the positioning holes of the front bottom plate (1) and the rear bottom plate (2). The anti-rollover block (33) is set on both sides of the adjusting plate (32). When using this cleaning device, place it directly above the roll and use compressed air to apply pressure perpendicular to the roll surface to the front and rear base plates, ensuring that the cleaning device is completely attached to the surface of the roll.

2. The rolling mill surface cleaning device according to claim 1, characterized in that: Two walking devices are arranged at both ends of the outer side of the front support plate (3), and one walking device is arranged in the middle of the rear support plate (5). Two walking devices are arranged at both ends of the outer side of the rear support plate (5). In the walking device, the slide groove (8) is welded and fixed to the outside of the front support plate (3) and the rear support plate (5). The tops of the two sliders (10) are located inside the slide groove (8). A spring (9) is installed between the left side of the left slider (10) and the inner wall of the slide groove (8). On the right side of the left slider (10), a stop block (11) is installed on the inner wall of the slide groove (8). The same applies to the right slider (10), but a spring (9) is installed on the right side of the slider (10), and a stop block (11) is installed on the left side. The rest are the same. The connecting rod (15) and the slider (10) are connected by a cylindrical pin (14), and the middle position of the two connecting rods (15) is also connected by a cylindrical pin (14); the connecting rod (15) and the support rod (16) are connected by a cylindrical pin (14), the walking wheel (18) is fixed to the lower side of the support rod (16) by the support shaft (17), and the two sides of the support shaft (17) are supported on the support rod (16) by bearings; the outside of the support rod (16) is fixed with a walking motor (19) by bolts, and the output shaft of the walking motor (19) and the support shaft (17) are driven by bevel gear (20).

3. The rolling mill surface cleaning device according to claim 2, characterized in that: The camera (7) is fixed between two sliding grooves (8) on the outside of the front support plate (3).

4. The rolling mill surface cleaning device according to claim 1, characterized in that: The front base plate (1) has a rectangular spray hole, the spray pipe (22) is welded and fixed to the rectangular spray hole, the spray nozzle (23) is connected to the spray pipe (22) by a thread, and the spray nozzle (23) is arranged at a 60° angle to the front base plate (1).

5. A roll surface cleaning device according to claim 1, characterized in that: The structure of the coarse brush roller device is as follows: a rectangular coarse brush roller hole is opened in the front base plate (1), the coarse brush roller baffle (24) is completely welded to the edge line of the rectangular coarse brush roller hole, the coarse brush roller bearing seat (25) is arranged on both sides of the coarse brush roller baffle (24) to fix the coarse brush roller bearing (26), the coarse brush roller bearing (26) supports the rotation of the coarse brush roller (27); the coarse brush roller motor (28) is fixed on the left side of the coarse brush roller baffle (24), the output shaft of the coarse brush roller motor (28) and the coarse brush roller bearing (26) are driven by meshing through a helical gear (29); a large pulley (30) is installed on the coarse brush roller bearing (26). The structure of the fine brush roller device is as follows: a rectangular fine brush roller hole is opened in the rear base plate (2), the fine brush roller baffle (37) is completely welded to the edge line of the rectangular fine brush roller hole in the rear base plate, the fine brush roller bearing seat (35) is arranged on both sides of the fine brush roller baffle (37) to fix the fine brush roller bearing (36), the fine brush roller bearing (36) supports the rotation of the fine brush roller (38); a small pulley (34) is installed on the fine brush roller bearing (36), and the small pulley (34) and the large pulley (30) are connected by a belt (31).

6. A roll surface cleaning device according to claim 5, characterized in that: The coarse brush roller (27) and fine brush roller (38) are made of rubber rollers and are installed at a position slightly lower than the front bottom plate (1) and the rear bottom plate (2).

7. A roll surface cleaning device according to claim 1, characterized in that: The vacuum chamber includes a vacuum chamber and a vacuum pipe (41). A rectangular vacuum hole is opened on the rear bottom plate (2). The vacuum chamber is completely welded to the edge of the rectangular vacuum hole. A leather plate (40) is installed on the lower side of the vacuum chamber. The vacuum pipe (41) is welded to the middle position of the vacuum chamber. The rear bottom plate (2) has a rectangular air drying hole. The air drying pipe (42) is welded and fixed to the edge of the air drying hole. The air drying nozzle (43) is connected to the air drying pipe (42) by a thread. The air drying nozzle (43) is arranged perpendicular to the rear bottom plate (2).

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