A method of manufacturing a pet sheet

Abstract

This invention discloses a calendering device for PET sheets and its usage method, including a calendering dust removal mechanism. The calendering dust removal mechanism includes a worktable, with a first rectangular frame fixedly connected to the rear of both sides of the top of the worktable, and a second rectangular frame fixedly connected to the front of both sides of the top of the worktable. This invention relates to the field of PET sheet calendering technology. This PET sheet calendering device and its usage method combine the calendering dust removal mechanism and the lifting and maintenance mechanism. Before operation, these two mechanisms allow the T-shaped top plate to be raised as a whole using a cylinder, and the third rotating rod and the second guide roller to be rotated into an inclined vertical state using the cooperation between the structures, facilitating maintenance and replacement. It also allows for pre-adjustment of the distance between the second and first guide rollers, and allows the ash storage box to dock with the support plate after the T-shaped top plate is lowered by the cylinder.

Description

Technical Field

[0001] This invention relates to the field of PET sheet calendering technology, specifically to a PET sheet calendering apparatus and its usage method. Background Technology

[0002] PET sheets are white and are a material primarily composed of polyethylene terephthalate (PET) and polybutylene terephthalate (PET). They are widely used in textiles, papermaking, food machinery, transportation, docks, medical applications, coal mining, and chemical industries. Applications include bearings, guide heads for food processing machines, pistons, screw rolls, and other food jigs and parts; bearings for precision machinery; and electrical insulation materials. PET sheets require calendering during production, and existing calendering equipment allows for easy adjustment of the gap between the upper and lower guide rollers. Patent documents have now been filed to improve this process.

[0003] For example, Chinese patent CN220741888U includes a machine base. The top surface of the machine base is bolted with two sets of support columns. The outer surface of each support column has adjustable sliding holes, and sliders for support are slidably installed inside the sliding holes. Support rollers for supporting PET sheets are rotatably installed between the two sets of sliders and between the two sets of support columns. The top surface of each support column is screwed with a cover plate for sealing the sliding holes. Through the design of the support columns, sliding holes, sliders, cover plates, electric push rods, and support rollers, the distance between the two sets of support rollers for supporting and guiding PET sheets can be adjusted automatically. This allows for adjustment of the distance between the two sets of support rollers without disassembling each roller individually, facilitating the support and guidance of PET sheets and improving the efficiency of adjustment.

[0004] While the equipment described in the above document facilitates quick and convenient adjustment of the upper and lower guide rollers, it still has significant drawbacks in practical use, such as:

[0005] Although the equipment can adjust the guide rollers, it is still inconvenient to use like traditional equipment. When the guide rollers calender the PET sheet, the PET sheet is in a relatively soft state at this time, and impurities such as lint in the air can easily adhere to its surface. Then, after being calendered by the guide rollers, the lint and other impurities will be pressed into the interior of the PET sheet. After cooling and solidification, the interior of the PET sheet will be cloudy and have poor light transmittance. At the same time, most of the guide rollers in existing calendering equipment are fixed, which makes maintenance and disassembly too cumbersome and inconvenient.

[0006] Therefore, a calendering device for PET sheets has been designed to improve maintenance and calendering quality to address these defects. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a PET sheet calendering device and its usage method, which solves the problems of impurities easily adhering to PET sheets during calendering and the inconvenience of equipment maintenance.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a calendering device for PET sheets, comprising a calendering dust removal mechanism, the calendering dust removal mechanism comprising a worktable, wherein a first rectangular frame is fixedly connected to the rear of both sides of the top of the worktable, and a second rectangular frame is fixedly connected to the front of both sides of the top of the worktable; a first rotating rod is rotatably connected to the rear side of the inner cavity of the first rectangular frame via a bearing, and the front end of the first rotating rod passes through the first rectangular frame and the second rectangular frame sequentially and extends to the front of the second rectangular frame; a first guide roller is fixedly connected to the surface of the first rotating rod and located between the first rectangular frame and the second rectangular frame; the two first rotating rods are connected by a first pulley and a first belt drive; a first motor is fixedly connected to the surface of the left first rectangular frame via a bracket, and the output shaft of the first motor is fixedly connected to the front end of the left first rotating rod; and a lifting and maintenance mechanism is installed on the top of the worktable.

[0009] Preferably, the surface of the workbench is fixedly connected to a guide slide support frame via a fixing block, a positioning slide is slidably installed on the inner side of the guide slide support frame, and load-bearing recesses are fixedly connected to both sides of the top of the positioning slide via fixing blocks. A vertical threaded rod is rotatably connected to the top of the guide slide support frame through an opening, and a sub-support is fixedly connected to the front of the positioning slide, and the sub-support is threadedly connected to the vertical threaded rod. Toothed plates are fixedly connected to both ends of the sub-support.

[0010] Preferably, a linkage top frame is fixedly connected between the two first rectangular frames by a fixing plate. The rear part of the inner cavity of the linkage top frame is rotatably connected to a transverse threaded rod by a bearing. The transverse threaded rod is connected to the right first rotating rod by a second pulley and a second belt drive. A threaded sleeve is threadedly connected to the surface of the transverse threaded rod, and the threaded sleeve is slidably connected to the inner wall of the linkage top frame.

[0011] Preferably, an adsorption top plate is fixedly connected to the front side of the bottom of the threaded sleeve plate via a bracket, a lower friction plate that cooperates with the adsorption top plate is fixedly connected to the front side of the bottom of the linkage top frame via a fixing plate, and a support plate is fixedly connected to the front side of the bottom of the lower friction plate via a bracket.

[0012] Preferably, the lifting and maintenance mechanism includes a cylinder, which is fixedly installed at the rear of the workbench. A T-shaped top plate is fixedly connected to the top of the cylinder. Bending rods are fixedly connected to both sides of the bottom of the T-shaped top plate. A perforated plate is slidably installed on the surface of the bending rod. A first spring is sleeved on the surface of the bending rod between the perforated plate and the T-shaped top plate. An arc pressure seat is fixedly connected to the bottom end of the bending rod, and the arc pressure seat extends to the inner side of the first rectangular frame.

[0013] Preferably, a front support plate is fixedly connected between the bottoms of the two hollow plates, and the front support plate is located at the front of the workbench. Both sides of the surface of the front support plate are rotatably connected to a second rotating rod through openings. The rear end of the second rotating rod is rotatably connected to a third rotating rod through a rotating component, and a second guide roller that cooperates with the first guide roller is fixedly connected to the surface of the third rotating rod.

[0014] Preferably, both sides of the front support plate are rotatably connected to a gear disk via bearing components. A curved rotating frame is fixedly connected to the rear of the gear disk, and the inner side of the curved rotating frame is rotatably connected to the surface of the third rotating rod. The two second rotating rods are connected by a third pulley and a third belt drive. A second motor is fixedly connected to the right side of the front support plate via a bracket, and the output shaft of the second motor is fixedly connected to the second rotating rod on the right side via a coupling.

[0015] Preferably, the top of the front support plate is fixedly connected to a ash storage box that cooperates with the support plate via a bracket, and the rear part of the inner cavity of the ash storage box is rotatably connected to a scraping shovel that cooperates with the adsorption top plate. A second spring is fixedly connected between the scraping shovel and the inner wall of the ash storage box.

[0016] This invention also discloses a method for using a calendering device for PET sheets, specifically including the following steps:

[0017] S1. Tilting Maintenance: Before use, use the cylinder to lift the entire lifting maintenance mechanism upwards and tilt the second guide roller for maintenance and inspection.

[0018] S2. Spacing adjustment: After the inspection is completed, rotate the vertical threaded rod to drive the load-bearing recess and toothed plate to rise and adjust the height so that the second guide roller and the first guide roller have the corresponding spacing.

[0019] S3. Dust Removal Calendering: The dust is adsorbed by the friction between the top adsorption plate and the lower friction plate, and by the reciprocating movement on the top of the worktable.

[0020] This invention provides a calendering apparatus for PET sheets and a method for using the same. Compared with existing technologies, it has the following advantages:

[0021] (1) The calendering device for the PET sheet and its usage method are combined with the calendering dust removal mechanism and the lifting maintenance mechanism. The two mechanisms can be set up so that the T-shaped top plate can be raised as a whole by the cylinder before the work is started. The third rotating rod and the second guide roller can be rotated into an inclined vertical state by the cooperation between the structures, which is convenient for maintenance and replacement. At the same time, the distance between the second guide roller and the first guide roller can be pre-adjusted. After the cylinder drives the T-shaped top plate to descend, the ash storage box can be connected with the support plate. During the calendering work, the adsorption top plate and the lower friction plate are rubbed to generate static electricity, and the lint on the top is adsorbed, reducing the impurities falling on the top of the PET sheet, thereby improving the quality and light transmittance of the PET sheet and meeting the current use requirements.

[0022] (2) The calendering device for the PET sheet and its usage method are as follows: a gear disk is installed on both sides of the gear disk and connected to the third rotating rod by a curved rotating frame. It is used in conjunction with a load-bearing recess, a toothed plate and an arc pressing seat. The configuration of these structures allows the gear disk to mesh with the toothed plate when the cylinder rises, thereby driving the third rotating rod and the second guide roller to rotate vertically, which is convenient for maintenance and reduces the failure rate during calendering. When the cylinder falls, the gear disk can reverse and drive the third rotating rod to return to the horizontal state. After one end of the third rotating rod enters the first rectangular frame, the arc pressing seat can dock and position one end of the third rotating rod. The entire process does not require the staff to perform cumbersome equipment installation, which is convenient for the staff to use.

[0023] (3) The calendering device for the PET sheet and its usage method are as follows: a linkage top frame is installed between two second rectangular frames, and an adsorption top plate is installed on the inner side of the linkage top frame using a transverse threaded rod. It is used in conjunction with a lower friction plate and a scraper. When the calendering is performed, the rotating transverse threaded rod drives the adsorption top plate to move back and forth. When the adsorption top plate moves, it will rub against the lower friction plate, thereby generating static electricity on the surface. When it passes over the top of the PET sheet, it adsorbs the lint on the top to reduce the pressure of impurities. When the lower friction plate moves into the ash storage box and resets, the scraper will scrape the lint at the bottom of the lower friction plate into the ash storage box for storage. After the T-shaped top plate rises, it can drive the ash storage box to separate from the support plate, thereby facilitating cleaning by the staff and effectively improving the quality of the product.

[0024] (4) The PET sheet extrusion device and its usage method are as follows: a positioning slide is installed on the surface of the workbench using a guide slide bracket, and a load-bearing recess and a toothed plate are installed on the top of the positioning slide. The arrangement of these structures allows the load-bearing recess and the toothed plate to rise synchronously using a vertical threaded rod before the T-shaped top plate descends, thereby adjusting the distance so that the third rotating rod can first contact the load-bearing recess for blocking when it descends. At the same time, it can also ensure a constant distance between the toothed plate, the gear disk, and the load-bearing recess, so that the third rotating rod can always rotate vertically and then disengage the gear disk from the toothed plate, thus ensuring the overall stability of the equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a rear view of the calendering dust removal mechanism and lifting maintenance mechanism structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the calendering dust removal mechanism structure of the present invention;

[0028] Figure 4 This is a cross-sectional view of the first rectangular frame and the second rectangular frame structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the vertical threaded rod, the support bracket, and the toothed plate structure of the present invention;

[0030] Figure 6 This is a cross-sectional view of the linkage top frame structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the lifting and maintenance mechanism structure of the present invention;

[0032] Figure 8 This is a schematic diagram of the bent rod, the first spring, and the arc-shaped pressure seat structure of the present invention;

[0033] Figure 9 This is a cross-sectional view of the ash storage box structure of the present invention;

[0034] Figure 10 This is a schematic diagram of the front support plate, the third belt, and the second motor structure of the present invention;

[0035] Figure 11 This is a schematic diagram of the second rotating rod, the third rotating rod, and the second guide roller structure of the present invention.

[0036] In the diagram: 1. Calendering dust removal mechanism; 2. Lifting and maintenance mechanism; 101. Workbench; 102. First rectangular frame; 103. Second rectangular frame; 104. First rotating rod; 105. First guide roller; 106. First pulley; 107. First belt; 108. First motor; 109. Guide slide support; 110. Positioning slide; 111. Load-bearing recess; 112. Vertical threaded rod; 113. Sub-support; 114. Toothed plate; 115. Linkage top frame; 116. Horizontal threaded rod; 117. Second pulley; 118. Second belt; 11 9. Threaded sleeve plate; 120. Adsorption top plate; 121. Lower friction plate; 122. Support plate; 201. Cylinder; 202. T-shaped top plate; 203. Bent rod; 204. Hollow plate; 205. First spring; 206. Arc pressure seat; 207. Front support plate; 208. Second rotating rod; 209. Third rotating rod; 210. Second guide roller; 211. Gear disk; 212. Bent rotating frame; 213. Third pulley; 214. Third belt; 215. Second motor; 216. Ash storage box; 217. Scraper; 218. Second spring. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-11 The present invention provides a technical solution: a calendering device for PET sheets, including a calendering dust removal mechanism 1;

[0039] Please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6The diagram illustrates the overall structure of the calendering dust removal mechanism 1. The mechanism includes a workbench 101. First rectangular frames 102 are fixedly connected to the rear of both sides of the top of the workbench 101, and second rectangular frames 103 are fixedly connected to the front of both sides of the top of the workbench 101. A first rotating rod 104 is rotatably connected to the rear side of the inner cavity of the first rectangular frame 102 via bearings. The front end of the first rotating rod 104 passes through the first rectangular frame 102 and the second rectangular frame 103 sequentially and extends to the front of the second rectangular frame 103. A first guide roller 105 is fixedly connected to the surface of the first rotating rod 104 and between the first rectangular frame 102 and the second rectangular frame 103. The first rotating rods 104 are connected by a first pulley 106 and a first belt 107. A first motor 108, a servo motor, is fixedly connected to the surface of the left first rectangular frame 102 via a bracket. The output shaft of the first motor 108 is fixedly connected to the front end of the left first rotating rod 104. A lifting and maintenance mechanism 2 is installed on the top of the workbench 101. A guide slide bracket 109 is fixedly connected to the surface of the workbench 101 via a fixing block. A positioning slide bracket 110 is slidably installed on the inner side of the guide slide bracket 109. Load-bearing recesses 111 are fixedly connected to both sides of the top of the positioning slide bracket 110 via fixing blocks. The inner side of seat 111 is coated with grease to prevent hard friction with the third rotating rod 209. The top of the guide slide bracket 109 is rotatably connected to a vertical threaded rod 112 through an opening. The front of the positioning slide 110 is fixedly connected to a sub-bracket 113, which is threadedly connected to the vertical threaded rod 112. Both ends of the sub-bracket 113 are fixedly connected to toothed plates 114. A linkage top frame 115 is fixedly connected between the two first rectangular frames 102 through a fixing plate. The rear of the inner cavity of the linkage top frame 115 is rotatably connected to a transverse threaded rod 116 through a bearing. The transverse threaded rod 116 is connected to the right first rotating rod 104 through a second... The pulley 117 is connected to the second belt 118 for transmission. The surface of the transverse threaded rod 116 is threaded with a threaded sleeve 119, and the threaded sleeve 119 is slidably connected to the inner wall of the linkage top frame 115. The front side of the bottom of the threaded sleeve 119 is fixedly connected to the adsorption top plate 120 by a bracket. The adsorption top plate 120 and the lower friction plate 121 are both wrapped with polyester fiber cloth on opposite sides to generate static electricity. The front side of the bottom of the linkage top frame 115 is fixedly connected to the lower friction plate 121, which is used in conjunction with the adsorption top plate 120, by a fixing plate. The front side of the bottom of the lower friction plate 121 is fixedly connected to the support plate 122 by a bracket.

[0040] Please refer to Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11The diagram illustrates the overall structure of the lifting and maintenance mechanism 2. The mechanism includes a cylinder 201, which is fixedly mounted on the rear of the workbench 101. A T-shaped top plate 202 is fixedly connected to the top of the cylinder 201. Bent rods 203 are fixedly connected to both sides of the bottom of the T-shaped top plate 202. A perforated plate 204 is slidably mounted on the surface of the bent rods 203. A first spring 205 is sleeved on the surface of the bent rods 203 between the perforated plate 204 and the T-shaped top plate 202. An arc-pressure seat 206 is fixedly connected to the bottom end of the bent rods 203. The inner side is coated with grease to prevent hard friction with the third rotating rod 209, and the arc pressure seat 206 extends to the inner side of the first rectangular frame 102. A front support plate 207 is fixedly connected between the bottoms of the two hollow plates 204, and the front support plate 207 is located at the front of the workbench 101. The second rotating rod 208 is rotatably connected to both sides of the surface of the front support plate 207 through openings. The rear end of the second rotating rod 208 is rotatably connected to the third rotating rod 209 through a rotating component. The second rotating rod 208 and the third rotating rod 209 are connected by a damping shaft to prevent easy rotation. The second motor... Each time, 215 drives the second rotating rod 208 and the third rotating rod 209 to their initial state, ensuring that the third rotating rod 209 can rotate. A second guide roller 210, which cooperates with the first guide roller 105, is fixedly connected to the surface of the third rotating rod 209. Gear disks 211 are rotatably connected to both sides of the front support plate 207 via bearings. A curved rotating frame 212 is fixedly connected to the rear of the gear disk 211, and the inner side of the curved rotating frame 212 is rotatably connected to the surface of the third rotating rod 209. The two second rotating rods 208 are connected by a third pulley 213 and a third belt 2. 14. Transmission connection: A second motor 215 is fixedly connected to the right side of the surface of the front support plate 207 via a bracket. The second motor 215 is a servo motor, and the output shaft of the second motor 215 is fixedly connected to the second rotating rod 208 on the right side via a coupling. A ash storage box 216 that cooperates with the support plate 122 is fixedly connected to the top of the front support plate 207 via a bracket. A scraping shovel 217 that cooperates with the adsorption top plate 120 is rotatably connected to the rear part of the inner cavity of the ash storage box 216. A second spring 218 is fixedly connected between the scraping shovel 217 and the inner wall of the ash storage box 216.

[0041] This invention also discloses a method for using a calendering device for PET sheets, specifically including the following steps:

[0042] S1. Tilting Maintenance: Before use, use cylinder 201 to lift the entire lifting maintenance mechanism 2 upwards and tilt the second guide roller 210 for maintenance and inspection.

[0043] S2. Spacing adjustment: After the inspection is completed, rotate the vertical threaded rod 112 to drive the load-bearing recess 111 and the toothed plate 114 to rise and adjust the height so that the second guide roller 210 and the first guide roller 105 have the corresponding spacing.

[0044] S3. Dust removal calendering: The dust is adsorbed by rubbing the top adsorption plate 120 against the lower friction plate 121 and reciprocating on the top of the worktable 101.

[0045] The more specific steps of using the above-mentioned PET sheet calendering device are as follows:

[0046] S1. Tilting Maintenance: Before use, start the cylinder 201 to push the T-shaped top plate 202 to drive the bent rod 203 to rise, and at the same time separate the arc pressure seat 206 from the third rotating rod 209. After the bent part of the bent rod 203 contacts the bottom of the hollow plate 204, the bent rod 203 lifts the hollow plate 204 to drive the front support plate 207 to rise. At this time, after the front support plate 207 rises, it drives the ash storage box 216 to separate from the support plate 122. After rising a certain distance, the gear disk 211 meshes with the toothed plate 114. As the cylinder 201 continues to rise, the gear disk 211 rotates counterclockwise, and the bent rotating frame 212 drives the third rotating rod 209 and the second guide roller 210 to rotate. After the second guide roller 210 rotates ninety degrees to a vertical position, stop rising. Then clean and maintain the second guide roller 210 and the first guide roller 105 to ensure stable operation during use.

[0047] S2. Gap Adjustment: After completing the maintenance of the second guide roller 210 and the first guide roller 105, adjust the gap between the second guide roller 210 and the first guide roller 105 after the second guide roller 210 has descended. First, based on the calendering thickness of the PET sheet, rotate the vertical threaded rod 112 to utilize the limiting position between the positioning slide 110 and the guide slide support 109 to push the load-bearing recess 111 and the toothed plate 114 to rise synchronously. Stop when it rises to the specified height. Then, start the cylinder 201 to drive the T-shaped top plate 202 to descend. After the front support plate 207 descends and the gear disk 211 re-engages with the toothed plate 114, use the descending force to drive the second guide roller 210 and the gear disk 211 to rotate clockwise. After the toothed plate 114 is separated, the second guide roller 210 returns to a transverse state. As the front support plate 207 descends, the second rotating rod 208 stops descending after contacting the inner side of the load-bearing recess 111. At this time, the rear end of the third rotating rod 209 is located inside the second rectangular frame 103. As the cylinder 201 drives the T-shaped top plate 202 to continue descending, the first spring 205 will be compressed to position the hollow plate 204. Then the bent rod 203 will continue to be pressed down until the arc pressure seat 206 contacts and installs one end of the third rotating rod 209 inside the second rectangular frame 103. At this time, the second guide roller 210 is completely fixed, and there is a suitable gap between the second guide roller 210 and the first guide roller 105.

[0048] S3. Dust Removal Calendering: After installation, the second motor 215 is started to rotate synchronously with the first motor 108. At this time, the second guide roller 210 and the first guide roller 105 rotate under the transmission of the third pulley 213, the third belt 214, the first pulley 106, and the first belt 107. Then, the PET sheet is drawn through the first guide roller 105 and the second guide roller 210 for calendering. During the calendering process, the first rotating rod 104 drives the transverse threaded rod 116 to rotate through the transmission of the second belt 118 and the second pulley 117. At this time, the adsorption top plate 120 moves back and forth under the limit of the threaded sleeve plate 119. Whenever the adsorption top plate 120 and the lower friction plate 12... When friction occurs, static electricity is generated on the surface. When the adsorption top plate 120 moves from the top of the PET sheet, it can adsorb the lint and dust on the top. When the adsorption top plate 120 moves to the front, it will first press the scraper 217 to flip downward. After the adsorption top plate 120 enters the dust collection box 216, the scraper 217 flips up again with elasticity. Then, when the adsorption top plate 120 moves backward, it will be blocked by the scraper 217. Then the scraper 217 scrapes off the lint at the bottom of the adsorption top plate 120 and accumulates it inside the dust collection box 216. After the work is completed, the force of the cylinder 201 rising will drive the dust collection box 216 to separate from the support plate 122, so as to facilitate the cleaning of lint and dust.

[0049] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

Claims

1. A calendering apparatus for PET sheets, comprising a calendering dust removal mechanism (1), characterized in that: The calendering dust removal mechanism (1) includes a workbench (101). A first rectangular frame (102) is fixedly connected to the rear of both sides of the top of the workbench (101). A second rectangular frame (103) is fixedly connected to the front of both sides of the top of the workbench (101). A first rotating rod (104) is rotatably connected to the rear side of the inner cavity of the first rectangular frame (102) via a bearing. The front end of the first rotating rod (104) passes through the first rectangular frame (102) and the second rectangular frame (103) sequentially and extends to the front of the second rectangular frame (103). A first guide roller (105) is fixedly connected to the surface of (104) and between the first rectangular frame (102) and the second rectangular frame (103). The two first rotating rods (104) are connected by a first pulley (106) and a first belt (107). A first motor (108) is fixedly connected to the surface of the first rectangular frame (102) on the left side by a bracket. The output shaft of the first motor (108) is fixedly connected to the front end of the first rotating rod (104) on the left side. A lifting and maintenance mechanism (2) is installed on the top of the workbench (101). The surface of the workbench (101) is fixedly connected to a guide slide support (109) by a fixing block. A positioning slide (110) is slidably installed on the inner side of the guide slide support (109). Both sides of the top of the positioning slide (110) are fixedly connected to a load-bearing recess (111) by a fixing block. The top of the guide slide support (109) is rotatably connected to a vertical threaded rod (112) through an opening. A sub-support (113) is fixedly connected to the front of the positioning slide (110), and the sub-support (113) is threadedly connected to the vertical threaded rod (112). Both ends of the sub-support (113) are fixedly connected to toothed plates (114). A linkage top frame (115) is fixedly connected between the two first rectangular frames (102) by a fixing plate. The rear part of the inner cavity of the linkage top frame (115) is rotatably connected to a transverse threaded rod (116) through a bearing. The transverse threaded rod (116) and the right first rotating rod (104) are connected by a second pulley (117) and a second belt (118). The surface of the transverse threaded rod (116) is threadedly connected to a threaded sleeve plate (119), and the threaded sleeve plate (119) is slidably connected to the inner wall of the linkage top frame (115). The front side of the bottom of the threaded sleeve plate (119) is fixedly connected to the adsorption top plate (120) by a bracket. The front side of the bottom of the linkage top frame (115) is fixedly connected to the lower friction plate (121) that works in conjunction with the adsorption top plate (120) by a fixing plate. The front side of the bottom of the lower friction plate (121) is fixedly connected to the support plate (122) by a bracket. The lifting and maintenance mechanism (2) includes a cylinder (201), and the cylinder (201) is fixedly installed at the rear of the workbench (101). A T-shaped top plate (202) is fixedly connected to the top of the cylinder (201). A bent rod (203) is fixedly connected to both sides of the bottom of the T-shaped top plate (202). A hollow plate (204) is slidably installed on the surface of the bent rod (203). A first spring (205) is sleeved on the surface of the bent rod (203) and between the hollow plate (204) and the T-shaped top plate (202). An arc pressure seat (206) is fixedly connected to the bottom end of the bent rod (203), and the arc pressure seat (206) extends to the inner side of the first rectangular frame (102). A front support plate (207) is fixedly connected between the bottoms of the two hollow plates (204), and the front support plate (207) is located at the front of the workbench (101). Both sides of the surface of the front support plate (207) are rotatably connected to a second rotating rod (208) through openings. The rear end of the second rotating rod (208) is rotatably connected to a third rotating rod (209) through a rotating component. The surface of the third rotating rod (209) is fixedly connected to a second guide roller (210) that cooperates with the first guide roller (105).

2. The calendering apparatus for PET sheets according to claim 1, characterized in that: Both sides of the front support plate (207) are rotatably connected to a gear disk (211) via bearing components. A curved rotating frame (212) is fixedly connected to the rear of the gear disk (211), and the inner side of the curved rotating frame (212) is rotatably connected to the surface of the third rotating rod (209). The two second rotating rods (208) are connected by a third pulley (213) and a third belt (214). A second motor (215) is fixedly connected to the right side of the surface of the front support plate (207) via a bracket, and the output shaft of the second motor (215) is fixedly connected to the second rotating rod (208) on the right side via a coupling.

3. The calendering apparatus for PET sheets according to claim 2, characterized in that: The top of the front support plate (207) is fixedly connected to a ash storage box (216) that works in conjunction with the support plate (122) via a bracket. The rear part of the inner cavity of the ash storage box (216) is rotatably connected to a scraper (217) that works in conjunction with the adsorption top plate (120). A second spring (218) is fixedly connected between the scraper (217) and the inner wall of the ash storage box (216).

4. The method of using the calendering apparatus for PET sheets according to claim 3, characterized in that: Specifically, the following steps are included: S1. Tilting Maintenance: Before use, use the cylinder (201) to lift the entire lifting maintenance mechanism (2) upwards and tilt the second guide roller (210) for maintenance inspection. S2. Spacing adjustment: After the inspection is completed, rotate the vertical thread rod (112) to drive the load-bearing recess (111) and toothed plate (114) to rise and adjust the height so that the second guide roller (210) and the first guide roller (105) have the corresponding spacing. S3, Dust Removal Calendering: The dust is adsorbed by rubbing the top adsorption plate (120) against the lower friction plate (121) and moving back and forth on the top of the worktable (101).

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