A low-temperature flame-retardant PVC film production equipment

Abstract

The present invention discloses a low-temperature flame-retardant PVC film production equipment, which relates to the field of pressure forming technology, including a bottom plate, a paint bucket installed on the bottom plate, a coating roller 1 and a coating roller 2 installed in the paint bucket, a fixed frame fixed on the bottom plate, a side plate installed on the fixed frame, a support roller 1, a support roller 2, an extrusion roller 1, and an extrusion roller 2 installed on the side plate, two different films are squeezed together by the extrusion roller 1 and the extrusion roller 2, the paint bucket is filled with a flame retardant, and the angle of the paint bucket can be adjusted and tilted. Through the above technical scheme, the surface film and the ultraviolet reflection film can be evenly coated with the flame retardant, and the depth of the surface film and the ultraviolet reflection film entering the flame retardant can be controlled to be different by adjusting the angle of the paint bucket, that is, the thickness of the coating is different, thereby achieving different flame retardant effects.

Description

Technical Field

[0001] The invention relates to the technical field of pressure forming, and in particular to a low-temperature flame-retardant PVC film production device. Background Art

[0002] The calendering of PVC film is a complex and delicate process that starts with the preparation and mixing of raw materials. First, PVC resin, plasticizer, stabilizer, lubricant and other necessary additives need to be stirred at high speed in a mixer in precise proportions to ensure uniform distribution of the components. Subsequently, the mixed raw materials enter the extruder plasticizer for pre-plasticization, and are converted into a molten state through the action of heat and shear force. The molten material then enters the open double-roller mill for further plasticization and sheeting, and is tested by a metal detector to ensure that no metal impurities are mixed. After that, these molten sheets are evenly fed into the gap between the rollers of the calender, and the sheets are gradually stretched into a film of the required width and thickness through the pressure and shear force of the rollers. During the calendering process, parameters such as the speed, pressure and temperature of the rollers need to be strictly controlled to optimize the plasticization and extension effect of the film. The calendered film is stretched and positioned by a traction device, and then slowly cooled in a slow cooling zone to avoid the generation of internal stress and cracks. The cooled and solidified film is further processed in a cooler to ensure that it reaches the required solid state properties. Finally, the trimmer removes the uneven edges, and the film is rolled into a roll by a winder for subsequent packaging, transportation and use. Throughout the process, the quality of the PVC calendered film must be tested, including key indicators such as film thickness, width, surface flatness, transparency, tensile strength, and elongation at break, to ensure that the quality of the final product meets the specified standards.

[0003] In the prior art, flame retardant coatings need to be added when producing flame retardant PVC. However, spraying is often used in traditional technologies, and the spraying is not uniform. At the same time, the circulation system is more complicated and difficult to control. Summary of the invention

[0004] In view of the above technical problems, the present invention discloses a low-temperature flame-retardant PVC film production equipment, including a bottom plate, a paint bucket is installed on the bottom plate, a coating roller 1 and a coating roller 2 are installed in the paint bucket, a fixed frame is fixedly installed on the bottom plate, a side plate is installed on the fixed frame, a support roller 1, a support roller 2, an extrusion roller 1, and an extrusion roller 2 are installed on the side plate, two different films are squeezed together by the extrusion roller 1 and the extrusion roller 2, the paint bucket is filled with a flame retardant, and the angle of the paint bucket can be adjusted and tilted. Through the above technical scheme, the surface film and the ultraviolet reflection film can be evenly coated with the flame retardant, and the depth of the surface film and the ultraviolet reflection film entering the flame retardant can be controlled to be different by adjusting the angle of the paint bucket, that is, the thickness of the coating is different, thereby achieving different flame retardant effects.

[0005] Furthermore, a bottom layer tilting motor is fixedly mounted on the bottom layer plate, a lead screw is fixedly mounted on the rotating shaft of the bottom layer tilting motor, a slider is slidably mounted on the bottom layer plate, a threaded hole on the slider cooperates with the lead screw, a tilting connecting rod is hinged on the slider, a paint bucket is hinged on the tilting connecting rod, and the paint bucket is hinged on the bottom layer plate.

[0006] A support block is fixedly mounted on the lower side of the paint bucket. When the paint bucket is in a horizontal state, the bottom surface of the support block contacts the bottom plate. Through the above technical solution, the bottom tilting motor can drive the lead screw and the slider to change the angle of the paint bucket, and the self-locking property of the lead screw nut ensures that the paint bucket will not fall accidentally. When the paint bucket is in a horizontal state, the force between the slider and the lead screw is the largest. At this time, the support block can also provide support to reduce damage to parts.

[0007] Furthermore, a movable frame 2 and a movable frame 1 are slidably mounted in the fixed frame, a toggle shaft 2 is fixedly mounted on the coating roller 1, and a toggle shaft 1 is fixedly mounted on the coating roller 2. The toggle shaft 1 and the toggle shaft 2 can rotate and slide, driving the movable frame 2 and the movable frame 1 to slide in the fixed frame, a synchronous plate 1 is fixedly mounted on the movable frame 1, and a synchronous plate 2 is fixedly mounted on the movable frame 2, and deionizing nozzles are mounted on the inner sides of the synchronous plate 1 and the synchronous plate 2.

[0008] Furthermore, a positioning connecting plate is installed between the synchronous plate 1 and the synchronous plate 2, and an intermediate drying roller is rotatably installed on the positioning connecting plate. The intermediate drying roller is located between the two films to dry the inner sides of the two films. Through the above technical solution, when the angle of the paint bucket changes, the horizontal distance between the coating roller 1 and the coating roller 2 will also change, and at this time, the positions of the moving frame 2 and the moving frame 1 will be changed, thereby driving the synchronous plate 1 and the synchronous plate 2. The synchronous plate 1 and the synchronous plate 2 are always on both sides of the two films, and the films can be destaticized and dried. At the same time, an oblique downward air outlet can be set to blow away excess flame retardant downward.

[0009] Furthermore, a positioning spring 1 and a positioning spring 2 are fixedly mounted on both sides of the first shifting shaft, respectively. The first positioning spring is fixedly connected to the first synchronous plate, and the second positioning spring is fixedly connected to the second synchronous plate.

[0010] Furthermore, a driving gear is fixedly mounted on one side of the middle drying roller, a driving frame is slidably mounted on the fixed frame, a driving rack is fixedly mounted on the driving frame, and the driving rack is meshed with the driving gear.

[0011] Furthermore, a long hole is provided in the driving frame, and the axis of the middle drying roller is fitted with the long hole. The middle drying roller moves horizontally to drive the driving frame, and moves vertically in the long hole. Through the above technical solution, the positioning connecting plate is between the synchronous plate 1 and the synchronous plate 2, and the positioning spring 1 and the positioning spring 2 can ensure that the middle drying roller is in the middle of the synchronous plate 1 and the synchronous plate 2, and the film is on both sides of the middle drying roller. The middle drying roller is provided with a drying or static electricity removal or blowing structure, and can rotate during the up and down movement, and the rotating spraying is more uniform.

[0012] Furthermore, the side plate is fixedly provided with an adjustment electric cylinder 1 and an adjustment motor, the adjustment electric cylinder 1 drives the support roller 1 to move axially, and the adjustment electric cylinder 1 drives the support roller 2 to move axially.

[0013] The beneficial effects of the present invention compared with the prior art are:

[0014] (1) Through the above technical solution, the flame retardant can be evenly applied to the surface film and the ultraviolet reflective film. By adjusting the angle of the paint bucket, the depth of the surface film and the ultraviolet reflective film entering the flame retardant can be controlled to be different, that is, the thickness of the coating is different, thereby achieving different flame retardant effects.

[0015] (2) Through the above technical solution, the bottom tilt motor can drive the lead screw and the slider to change the angle of the paint bucket, and the self-locking characteristics of the lead screw nut can ensure that the paint bucket will not fall accidentally. When the paint bucket is horizontal, the force between the slider and the lead screw is the largest. At this time, support can also be provided by the support block to reduce damage to parts.

[0016] (3) Through the above technical solution, when the angle of the paint bucket changes, the horizontal distance between the coating roller 1 and the coating roller 2 will also change. At this time, the positions of the moving frame 2 and the moving frame 1 will be changed, thereby driving the synchronous plate 1 and the synchronous plate 2. The synchronous plate 1 and the synchronous plate 2 are always on both sides of the two films, and the films can be destaticized and dried. At the same time, an air outlet can be set obliquely downward to blow away excess flame retardant.

[0017] (4) Through the above technical solution, the positioning connecting plate is between the synchronous plate 1 and the synchronous plate 2. Through the action of the positioning spring 1 and the positioning spring 2, the middle drying roller can be ensured to be exactly in the middle of the synchronous plate 1 and the synchronous plate 2. The film is on both sides of the middle drying roller. The middle drying roller is provided with a drying or static electricity removal or blowing structure, and can rotate during the up and down movement, so that the rotating spraying is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of paint bucket adjustment according to an embodiment of the present invention.

[0020] Figure 3 It is a side view of an embodiment of the present invention.

[0021] Figure 4 for Figure 3 Cross-sectional view at AA in the middle.

[0022] Figure 5 Schematic diagram of the internal structure of an embodiment of the present invention.

[0023] Figure 6 A schematic diagram of the local structure of an embodiment of the present invention Figure 1 .

[0024] Figure 7 A schematic diagram of the local structure of an embodiment of the present invention Figure 2 .

[0025] Figure 8 A schematic diagram of the local structure of an embodiment of the present invention Figure 3 .

[0026] Figure numbers: 1-bottom plate; 2-bottom tilting motor; 3-screw; 4-slider; 5-fixed connecting ear; 6-tilt connecting rod; 7-support block; 8-paint bucket; 9-entry roller 1; 10-coating roller 1; 11-coating roller 2; 12-entry roller 2; 13-support roller 1; 14-support roller 2; 15-squeeze roller 1; 16-squeeze roller 2; 17-swivel shaft 1; 18-swivel shaft 2; 19-fixed Frame; 20-moving frame two; 21-moving frame one; 22-driving frame; 23-driving rack; 24-driving gear; 25-synchronizing plate one; 26-positioning spring one; 27-positioning connecting plate; 28-positioning spring two; 29-synchronizing plate two; 30-middle drying roller; 31-deionizing nozzle; 32-extrusion motor one; 33-extrusion motor two; 34-adjusting electric cylinder one; 35-adjusting motor; 36-top plate; 37-side plate. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0028] like Figure 1-Figure 8As shown, a low-temperature flame-retardant PVC film production equipment is mainly used to extrude a surface film and an ultraviolet reflective film (two films) together, including a bottom plate 1, a coating bucket 8 is installed on the bottom plate 1, and an entry roller 9 and an entry roller 2 12 are rotatably installed on both sides of the coating bucket 8, and a coating roller 10 and a coating roller 2 11 are installed in the coating bucket 8, a fixed frame 19 is fixedly installed on the bottom plate 1, and a side plate 37 is installed on the fixed frame 19, and a supporting roller 13, a supporting roller 2 14, an extrusion roller 15, and an extrusion roller 2 16 are installed on the side plate 37. The surface film and the ultraviolet reflective film pass through the upper side of the entry roller 1 9 and the entry roller 2 12 respectively, and then pass through the coating roller 10 and the coating roller 2 11. On the lower side, from between the coating roller 10 and the coating roller 2 11 upward, through the outer side of the support roller 13 and the support roller 2 14, that is, the support roller 13 and the support roller 2 14 are between the two films, and then the two films are gathered between the extrusion roller 15 and the extrusion roller 2 16, and the extrusion roller 15 and the extrusion roller 2 16 are hot pressed, and the extrusion roller 15 and the extrusion roller 2 16 are controlled to rotate by the extrusion motor 2 33 and the extrusion motor 1 32, and the extrusion motor 1 32 and the extrusion motor 2 33 are fixedly installed on the side plate 37, and two different films are squeezed together by the extrusion roller 15 and the extrusion roller 2 16, and the paint bucket 8 is filled with flame retardant, and the angle of the paint bucket 8 can be adjusted and tilted. Through the above technical scheme, the surface film and the ultraviolet reflection film can be evenly coated with flame retardant, and the depth of the surface film and the ultraviolet reflection film entering the flame retardant can be controlled by adjusting the angle of the paint bucket 8, that is, the thickness of the coating is different, thereby bringing different flame retardant effects.

[0029] In this embodiment, a bottom layer tilting motor 2 is fixedly mounted on the bottom layer plate 1, a lead screw 3 is fixedly mounted on the rotating shaft of the bottom layer tilting motor 2, a fixed connecting ear 5 is fixedly mounted on the bottom layer plate 1, the lead screw 3 is rotatably mounted on the fixed connecting ear 5, a slider 4 is slidably mounted on the bottom layer plate 1, a threaded hole on the slider 4 cooperates with the lead screw 3, a tilting connecting rod 6 is hinged on the slider 4, a first end of a paint bucket 8 is hinged on the tilting connecting rod 6, and a second end of the paint bucket 8 is hinged on the bottom layer plate 1.

[0030] The support block 7 is fixed on the lower side of the paint bucket 8. When the paint bucket 8 is in a horizontal state, the bottom surface of the support block 7 contacts the bottom plate 1. Through the above technical solution, the bottom tilting motor 2 can drive the lead screw 3 and the slider 4 to change the angle of the paint bucket 8, and the self-locking property of the lead screw nut ensures that the paint bucket 8 will not fall accidentally. When the paint bucket 8 is in a horizontal state, the force between the slider 4 and the lead screw 3 is the largest. At this time, the support block 7 can also provide support to reduce damage to parts.

[0031] In this embodiment, a moving frame 20 and a moving frame 1 21 are slidably mounted in the fixed frame 19, and the moving frame 20 and the moving frame 1 21 slide laterally in the fixed frame 19. A toggle shaft 2 18 is fixedly mounted on the coating roller 10, and a toggle shaft 17 is fixedly mounted on the coating roller 11. The toggle shaft 17 and the toggle shaft 2 18 can rotate and slide in the moving frame 1 21 and the moving frame 2 20. When the paint bucket 8 changes its angle, the horizontal distance between the toggle shaft 17 and the toggle shaft 2 18 changes, which will drive the distance between the coating roller 10 and the moving frame 1 21 to change, and drive the moving frame 2 20 and the moving frame 1 21 to slide in the fixed frame 19. A synchronous plate 25 is fixedly mounted on the moving frame 1 21, and a synchronous plate 29 is fixedly mounted on the moving frame 20. Deionizing nozzles 31 are mounted on the inner sides of the synchronous plates 1 25 and 29, and downwardly inclined air outlets are also mounted, and drying devices can also be mounted.

[0032] In this embodiment, a positioning connecting plate 27 is installed between the synchronous plate 1 25 and the synchronous plate 2 29, and an intermediate drying roller 30 is rotatably installed on the positioning connecting plate 27. The intermediate drying roller 30 is located between the two films to dry the inner sides of the two films. A deionization device and an air outlet may also be installed on the intermediate drying roller 30. Through the above technical solution, when the angle of the coating bucket 8 is changed, the horizontal distance between the coating roller 10 and the coating roller 2 11 will also change, and the positions of the moving frame 20 and the moving frame 1 21 will be changed, thereby driving the synchronous plate 1 25 and the synchronous plate 2 29. The synchronous plate 1 25 and the synchronous plate 2 29 are always on both sides of the two films, and the films can be destaticized and dried. At the same time, an air outlet can be set obliquely downward to blow away excess flame retardant.

[0033] A positioning spring 1 26 and a positioning spring 2 28 are fixedly mounted on both sides of the toggle shaft 17, respectively. The positioning spring 1 26 is fixedly connected to the synchronous plate 1 25, and the positioning spring 2 28 is fixedly connected to the synchronous plate 2 29. A driving gear 24 is fixedly mounted on one side of the intermediate drying roller 30, and a driving frame 22 is slidably mounted on the fixed frame 19. A driving rack 23 is fixedly mounted on the driving frame 22, and the driving rack 23 is meshed with the driving gear 24. An elongated hole is arranged in the driving frame 22, and the axis of the intermediate drying roller 30 fits in the elongated hole. The intermediate drying roller 30 moves horizontally to drive the driving frame 22, and the intermediate drying roller 30 moves vertically in the elongated hole. A lifting electric cylinder (not shown) is fixedly mounted on the fixed frame 19, and the output end of the lifting electric cylinder is fixedly connected to the synchronous plate 1 25 and the synchronous plate 2 29, driving the synchronous plate 1 25 and the synchronous plate 2 29 to move up and down, and move the two films impregnated with flame retardant. At this time, the intensity of drying, deionization and blowing can be controlled by changing the speed. Through the above technical scheme, the positioning connecting plate 27 is between the synchronous plate 1 25 and the synchronous plate 2 29, and the positioning spring 1 26 and the positioning spring 2 28 can ensure that the middle drying roller 30 is in the middle of the synchronous plate 1 25 and the synchronous plate 2 29, and the film is on both sides of the middle drying roller 30. The drying or static electricity removal or blowing structure is set on the middle drying roller 30, and it can rotate during the up and down movement, and the rotating spraying is more uniform.

[0034] An adjusting electric cylinder 1 34 and an adjusting motor 35 are fixedly mounted on the side plate 37. The adjusting electric cylinder 1 34 drives the supporting roller 1 13 to move axially, and the adjusting electric cylinder 1 34 drives the supporting roller 2 14 to move axially.

[0035] Working principle: the surface film is bypassed from the upper side of the entry roller 19, then bypassed from the lower side of the coating roller 10, and wound out from between the coating roller 10 and the coating roller 2 11, and then passed from the side of the support roller 2 14 and finally arrived between the extrusion roller 15 and the extrusion roller 2 16. The ultraviolet reflective film passes from the upper side of the entry roller 2 12, and then passes through the lower side of the coating roller 2 11 and winds out from between the coating roller 10 and the coating roller 2 11, and then passes through the outer side of the support roller 13 and enters between the extrusion roller 15 and the extrusion roller 2 16. The inclination degree of the paint bucket 8 is adjusted, and the bottom layer inclination motor 2 is started. The bottom layer inclination motor 2 drives the screw 3 to rotate, and the screw 3 drives the slider 4 to slide. The slider 4 drives the inclination connecting rod 6 to support the paint bucket 8, and the paint bucket 8 is tilted. The dotted line in the figure represents the liquid level. The connecting line of the coating roller 10 and the coating roller 2 11 is parallel to the bottom surface of the paint bucket 8. When the paint bucket 8 When tilted, the liquid level is horizontal, but the coating roller 10 and the coating roller 2 11 are at different heights. The lower one can be immersed in the flame retardant for a longer time. During the adjustment process, the horizontal distance between the coating roller 10 and the coating roller 2 11 will also change. At this time, the toggle shaft 17 and the toggle shaft 2 18 will toggle the moving frame 1 21 and the moving frame 20 to slide and follow the adjustment in the fixed frame 19. At the same time, the positioning spring 1 26 and the positioning spring 2 28 have the same elastic force, which also makes the middle drying roller 30 always in the middle of the synchronous plate 1 25 and the synchronous plate 2 29. During the process, the driving frame 22 is also driven to slide and adjust on the fixed frame 19. Before the two films reach the supporting roller 13 and the supporting roller 2 14, they want to pass through the synchronous plate 1 25 and the synchronous plate 2 29. At this position, the fixed order of the synchronous plate 1 25, the surface film, the middle drying roller 30, the ultraviolet reflective film, and the synchronous plate 2 29 is always maintained.

[0036] Start the lifting electric cylinder, start the extrusion motor 1 32 and the extrusion motor 2 33, and start working. The lifting electric cylinder drives the synchronous plate 1 25 and the synchronous plate 2 29 to reciprocate up and down, and the inside and outside of the two films are dried, deionized and blown. Finally, the surface film and the ultraviolet reflective film are hot-pressed together by the extrusion roller 15 and the extrusion roller 2 16. The extrusion roller 15 and the extrusion roller 2 16 are provided with a heating component, and then reeled after cooling. During the process, if the surface film and the ultraviolet reflective film are not aligned neatly enough, the axial distance between the support roller 13 and the support roller 2 14 can be adjusted by adjusting the motor 35 and the adjusting electric cylinder 1 34. The support roller 13 and the support roller 2 14 are provided with grooves, and the films are in the grooves, so the position between the two films is adjusted to ensure the quality of hot pressing.

[0037] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A low-temperature flame-retardant PVC film production equipment, characterized in that: The invention comprises a bottom plate (1), a coating bucket (8) is mounted on the bottom plate (1), a coating roller 1 (10) and a coating roller 2 (11) are mounted in the coating bucket (8), a fixing frame (19) is fixedly mounted on the bottom plate (1), a side plate (37) is mounted on the fixing frame (19), a supporting roller 1 (13), a supporting roller 2 (14), a squeezing roller 1 (15), and a squeezing roller 2 (16) are mounted on the side plate (37), two different films are squeezed together by the squeezing roller 1 (15) and the squeezing roller 2 (16), a flame retardant is contained in the coating bucket (8), the coating bucket (8) can be tilted at an adjustable angle, and the angle of the coating bucket (8) is adjusted to control the different depths of the surface film and the ultraviolet reflection film entering the flame retardant; The bottom plate (1) is fixedly provided with a bottom tilting motor (2), a lead screw (3) is fixedly provided on the rotating shaft of the bottom tilting motor (2), a slider (4) is slidably provided on the bottom plate (1), a threaded hole on the slider (4) cooperates with the lead screw (3), a tilting connecting rod (6) is hingedly provided on the slider (4), a paint bucket (8) is hingedly provided on the tilting connecting rod (6), and the paint bucket (8) is hingedly provided on the bottom plate (1); A support block (7) is fixedly mounted on the lower side of the paint bucket (8); when the paint bucket (8) is in a horizontal state, the bottom surface of the support block (7) is in contact with the bottom plate (1); A movable frame 2 (20) and a movable frame 1 (21) are slidably mounted in the fixed frame (19); a toggle shaft 2 (18) is fixedly mounted on the coating roller 1 (10); and a toggle shaft 1 (17) is fixedly mounted on the coating roller 2 (11); the toggle shaft 1 (17) and the toggle shaft 2 (18) are capable of rotating and sliding, thereby driving the movable frame 2 (20) and the movable frame 1 (21) to slide in the fixed frame (19); a synchronizing plate 1 (25) is fixedly mounted on the movable frame 1 (21); and a synchronizing plate 2 (29) is fixedly mounted on the movable frame 2 (20); and deionizing nozzles (31) are mounted on the inner sides of the synchronizing plate 1 (25) and the synchronizing plate 2 (29).

2. The low-temperature flame-retardant PVC film production equipment according to claim 1, characterized in that: A positioning connecting plate (27) is installed between the synchronous plate 1 (25) and the synchronous plate 2 (29). An intermediate drying roller (30) is rotatably installed on the positioning connecting plate (27). The intermediate drying roller (30) is located between the two films to dry the inner sides of the two films.

3. The low-temperature flame-retardant PVC film production equipment according to claim 2, characterized in that: Positioning spring 1 (26) is fixedly connected to synchronous plate 1 (25), and positioning spring 2 (28) is fixedly connected to synchronous plate 2 (29).

4. The low-temperature flame-retardant PVC film production equipment according to claim 3, characterized in that: A driving gear (24) is fixedly mounted on one side of the middle drying roller (30), a driving frame (22) is slidably mounted on the fixed frame (19), a driving rack (23) is fixedly mounted on the driving frame (22), and the driving rack (23) is meshed with the driving gear (24).

5. The low-temperature flame-retardant PVC film production equipment according to claim 4, characterized in that: The driving frame (22) is provided with an elongated hole, and the axis of the middle drying roller (30) is in contact with the elongated hole. The middle drying roller (30) moves horizontally to drive the driving frame (22), and the middle drying roller (30) moves vertically within the elongated hole.

6. The low-temperature flame-retardant PVC film production equipment according to claim 5, characterized in that: The side plate (37) is fixedly provided with an adjustment electric cylinder 1 (34) and an adjustment motor (35). The adjustment electric cylinder 1 (34) drives the support roller 1 (13) to move axially, and the adjustment electric cylinder 1 (34) drives the support roller 2 (14) to move axially.

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