PVC hard film production equipment

Abstract

The invention discloses PVC hard film production equipment, and relates to the technical field of plastic calendering equipment.The PVC hard film production equipment comprises a workbench, an extrusion mechanism is arranged above the workbench, a calendering frame is fixedly installed above the workbench, a first servo motor is fixedly installed on the surface of the calendering frame, and a second servo motor is fixedly installed on the surface of the calendering frame; the device further comprises a calendering device and a protection device. Wherein the calendering device comprises a preheating roller, a first pressing roller, a lifting frame, a second pressing roller, a cooling roller, a second servo motor, a rotating rod, a worm gear, a worm and a rotating disc, and the preheating roller is fixedly installed at the output end of the first servo motor. According to the PVC hard film production equipment, the thickness of a film can be conveniently changed by changing the vertical distance between the second pressing roller and the first pressing roller; and meanwhile, the lubricating oil is convenient to replace through the cover plate and the movable plug, the service life of the equipment is prolonged, and the subsequent maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of plastic calendering equipment, in particular to a PVC hard film production equipment. Background Art

[0002] PVC rigid film (also known as polyvinyl chloride rigid film) is widely used in packaging, advertising printing, medical equipment, architectural decoration and other fields. PVC rigid film is produced through mixing, extrusion, cooling and shaping, pulling and winding, cutting and packaging. Through the coordination and operation of these equipment, high-quality PVC rigid film can be produced.

[0003] The patent with the patent announcement number CN207889009U relates to a PVC hard film production equipment, including a calender, a lead-out wheel group, a warming wheel group, a cooling wheel group and a winder; the calender is provided with rollers arranged in an inverted L shape, and a lead-out wheel group is provided in the horizontal direction of the roller at the top; the output end of the lead-out wheel group is provided with a warming wheel group, the output end of the warming wheel group is provided with a cooling wheel group, and the output end of the cooling wheel group is provided with a winder; the calender in the patented PVC hard film production equipment adopts an inverted L shape, allowing the film to move from bottom to top to reduce the influence of gravity on the film when it passes through the calender, and significantly improves the three highs and two lows; by increasing the number of lead-out wheels, the stretching ratio between the rollers is reduced, and the surface temperature of the lead-out wheel is adjusted to reduce the shrinkage of the film during the stretching and thinning process; by adopting a warm water design inside the warming wheel, the horizontal lines and shrinkage on the surface of the film are reduced, and its flatness is also significantly improved.

[0004] In the above patent, the number of lead-out wheels is increased, the stretching ratio between the rollers is reduced, and the surface temperature of the lead-out wheels is adjusted to reduce the shrinkage of the film during the stretching and thinning process; warm water is used inside the warming wheel to reduce the horizontal lines and shrinkage on the surface of the film, and its flatness is also significantly improved. However, in the process of adjusting the film thickness, it may be necessary to correct the preparation, thereby reducing production efficiency. For this reason, a PVC hard film production equipment with adjustment function is designed. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a PVC hard film production device, which solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a PVC hard film production equipment, including a workbench, an extrusion mechanism is arranged above the workbench, a calendering frame is fixedly installed above the workbench, a servo motor 1 is fixedly installed on the surface of the calendering frame, and also includes: a calendering device and a protective device; wherein, the calendering device includes a preheating roller, a pressure roller 1, a lifting frame, a pressure roller 2, a cooling roller, a servo motor 2, a rotating rod, a worm gear, a worm and a turntable, the production raw materials are processed by the extrusion mechanism to hot melt extrude, and then the servo motor 1 and the servo motor 2 are started, the output end of the servo motor 1 rotates to drive the preheating roller to rotate, the rotation of the preheating roller maintains the extruded raw materials at a specific stability to facilitate shaping, and then the raw materials pass through the pressure roller 1 and the pressure roller 2, the preheating roller is fixedly installed at the output end of the servo motor 1, the pressure roller 1 rotates to penetrate the inner and outer walls of the calendering frame, the surface of the calendering frame is provided with a lifting groove, and the lifting frame is slidably installed in the lifting groove The gear train is a gear that is engaged with the gear train and is used to engage with the gear train of the gear train, and the gear train is engaged with the gear train of the gear train, and the gear train is engaged with the gear train of the gear train.

[0007] According to the above technical solution, a limiting groove is opened on the top of the calendering frame, and the worm wheel is arranged inside the limiting groove. Lubricating oil is stored inside the limiting groove. The lubricating oil stored inside the limiting groove can effectively improve the working smoothness of the worm wheel and the worm and reduce the wear of the worm wheel and the worm.

[0008] According to the above technical solution, a scale is provided on the surface of the calendering frame, and an indicator needle is fixedly installed on the surface of the turntable. The thickness of the film can be conveniently adjusted through the indicator needle and the scale by rotating the turntable.

[0009] According to the above technical solution, the bottom of the inner wall of the limiting groove is set as an inclined surface, the inner and outer walls of the limiting groove are provided with drainage holes, a movable plug is provided inside the drainage hole, and a cover plate is slidably installed on the top of the calendering frame. Maintenance personnel can facilitate the replacement of lubricating oil through the cover plate and the movable plug, thereby extending the service life of the equipment and reducing subsequent maintenance costs.

[0010] According to the above technical scheme, the tension control device includes a fixed rod, a swing rod, a stabilizing roller, a support rod, a telescopic elastic rod, a receiving tube, an adjusting rod and a sliding cutting knife tube. The film after calendering and finalization passes through the stabilizing roller and is wound up under the action of the winding mechanism. The film will drive the stabilizing roller to rotate. The fixed rod is fixedly installed on the outer wall of the calendering frame, the swing rod is rotatably installed on the circumferential surface of the fixed rod, the stabilizing roller rotates and passes through the left and right walls of the swing rod, the support rod is fixedly installed on the outer wall of the calendering frame, the telescopic elastic rod is rotatably installed on the circumferential surface of the support rod, the receiving tube is fixedly installed through the left and right walls of the swing rod, the adjusting rod is rotatably installed through the inner and outer walls of the receiving tube, the sliding cutting knife tube is slidably installed on the inner wall of the receiving tube, the telescopic elastic rod will shrink and drive the stabilizing roller to reverse, thereby maintaining the stability of the tension during the film production process and avoiding the film from being too loose during the winding process due to changes in tension.

[0011] According to the above technical solution, a spiral groove II is provided on the circumferential surface of the adjusting rod, and the adjusting rod is connected to the sliding cutter tube by a thread. The adjusting rod rotates through the spiral groove II to drive the sliding cutter tube to move, and the movement of the sliding cutter tube changes the trimming position.

[0012] According to the above technical solution, the free end of the telescopic elastic rod is rotatably connected to the circumferential surface of the stabilizing roller, and an arc groove is provided on the surface of the calendering frame, which facilitates the stabilizing roller to rotate around the fixed rod.

[0013] According to the above technical scheme, the protective device includes a fixed plate, a limit plate, an emergency stop button, a sliding rod, a limit rod and a connecting rod. The receiving tube rotates to contact and squeeze the limit plate to move upward, and the limit plate moves upward to contact and squeeze the emergency stop button. A sliding groove is opened on the surface of the calendering frame, and the fixed plate is fixedly installed inside the sliding groove. The limit plate slides through the upper and lower walls of the fixed plate. The emergency stop button is fixedly installed below the fixed plate, and the sliding rod is slidably installed on the inner wall of the sliding groove. The limit rod is slidably installed inside the sliding groove. The connecting rod is rotatably installed on the surface of the limit rod. The end of the connecting rod away from the limit rod is rotatably connected to the limit plate. Pressing the emergency stop button will stop the operation of the entire equipment.

[0014] According to the above technical solution, the emergency stop button is electrically connected to the extrusion mechanism, the emergency stop button is electrically connected to servo motor one, the emergency stop button is electrically connected to servo motor two, the emergency stop button is electrically connected to the winding mechanism, and a card slot is opened on the surface of the swing rod.

[0015] According to the above technical solution, the lower part of the limit plate is set as an arc surface, the limit plate is slidably connected to the inner wall of the sliding groove, the upper part of the limit rod is set as a bevel surface, the limit rod moves into the slot on the surface of the swing rod and limits it, so that the film remains in a taut state.

[0016] The present invention provides a PVC hard film production device, which has the following beneficial effects: (1) The PVC hard film production equipment, through the coordinated operation between the preheating roller, the first pressure roller, the lifting frame, the second pressure roller, the cooling roller, the second servo motor, the rotating rod, the worm wheel, the worm, the turntable, the lifting groove, the limiting groove, the winding mechanism, the movable plug and the cover plate, can conveniently change the film thickness by changing the vertical distance between the second pressure roller and the first pressure roller, thereby improving the applicability of the equipment. At the same time, the lubricating oil stored in the limiting groove can effectively improve the working smoothness of the worm wheel and the worm, reduce the wear of the worm wheel and the worm, and can facilitate the replacement of the lubricating oil through the cover plate and the movable plug, thereby extending the service life of the equipment and reducing the subsequent maintenance cost.

[0017] (2) The PVC hard film production equipment, through the coordinated operation of the fixed rod, the swing rod, the stabilizing roller, the support rod, the telescopic elastic rod, the receiving tube, the adjusting rod and the sliding cutter tube, enables the telescopic elastic rod to maintain the stability of the tension during the film production process, thereby preventing the film from being too loose during the winding process due to the change in tension. At the same time, by rotating the adjusting rod, the sliding cutter tube moves to change the trimming position, thereby making timely adjustments according to the different positions of the two sides of the film of different thickness during the calendering process, further improving the applicability of the equipment.

[0018] (3) The PVC hard film production equipment, through the coordinated operation of the fixed plate, the limit plate, the emergency stop button, the sliding rod, the limit rod and the connecting rod, can stop the operation of the entire equipment when the emergency stop button is pressed, thereby preventing the film from being torn due to excessive tension during the production process, thereby increasing damage to the raw materials and subsequent maintenance costs. At the same time, the limit rod moves into the slot on the surface of the swing rod and limits it, so that the film remains in a taut state, and effectively avoids the loosening of the film due to the contraction of the telescopic elastic rod after the equipment is stopped suddenly, further reducing subsequent maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the calendering frame of the present invention; Figure 3 For the present invention Figure 2 The enlarged structural diagram of part A in the middle; Figure 4 This is a schematic diagram of the position structure of the lifting frame and the rotating rod of the present invention; Figure 5 It is a schematic diagram of the position structure of the swing rod and the stabilizing roller of the present invention; Figure 6 It is a schematic diagram of the position structure of the adjusting rod and the fixing plate of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram of part B is shown in the figure.

[0020] In the figure: 1, workbench; 2, extrusion mechanism; 3, calendering frame; 4, servo motor 1; 5, preheating roller; 6, pressure roller 1; 7, lifting frame; 8, pressure roller 2; 9, cooling roller; 10, servo motor 2; 11, rotating rod; 12, worm gear; 13, worm; 14, turntable; 15, lifting slot; 16, limiting slot; 17, winding mechanism; 18, movable plug; 19, cover plate; 201, fixed rod; 202, swing rod; 203, stabilizing roller; 204, support rod; 205, telescopic elastic rod; 206, receiving tube; 207, adjusting rod; 208, sliding cutter tube; 211, fixed plate; 212, limit plate; 213, emergency stop button; 214, sliding rod; 216, limit rod; 217, connecting rod; 218, card slot; 219, sliding slot. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of 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 are within the scope of protection of the present invention.

[0022] See also Figure 1-Figure 7One embodiment of the present invention is: a PVC hard film production equipment, including a workbench 1, an extrusion mechanism 2 is arranged above the workbench 1, a calendering frame 3 is fixedly installed above the workbench 1, and a servo motor 1 4 is fixedly installed on the surface of the calendering frame 3, and also includes: a calendering device and a protective device; wherein the calendering device includes a preheating roller 5, a pressure roller 1 6, a lifting frame 7, a pressure roller 2 8, a cooling roller 9, a servo motor 2 10, a rotating rod 11, a worm gear 12, a worm 13 and a turntable 14, and the production raw materials are processed by the extrusion mechanism 2 to be hot-melt extruded Then, the servo motor 14 and the servo motor 2 10 are started. The output end of the servo motor 14 rotates to drive the preheating roller 5 to rotate. The preheating roller 5 rotates to maintain the extruded raw material at a certain stability to facilitate shaping. Then, the raw material passes through the pressing roller 16 and the pressing roller 2 8. The preheating roller 5 is fixedly installed at the output end of the servo motor 14. The pressing roller 16 rotates to penetrate the inner and outer walls of the calendering frame 3. The surface of the calendering frame 3 is provided with a lifting groove 15. The lifting frame 7 is slidably installed in the lifting groove 15. The pressing roller 2 8 rotates to penetrate the inner and outer walls of the lifting frame 7. The cooling roller 9 rotates to penetrate The servo motor 10 is fixedly mounted on the outer wall of the lifting frame 7, the rotating rod 11 is rotatably mounted on the inner wall of the lifting groove 15, the worm wheel 12 is fixedly mounted on the circumferential surface of the rotating rod 11, the worm 13 rotates through the inner and outer walls of the calendering frame 3, the turntable 14 is fixedly mounted on both ends of the worm 13, the worm 13 is meshed with the worm wheel 12, a spiral groove 1 is provided on the surface of the rotating rod 11, the rotating rod 11 is connected to the lifting frame 7 by a threaded connection, and the output end of the servo motor 10 is connected to the pressure roller 2 8 and the cooling roller 9 by a transmission belt transmission. Next, the rotation of the worm gear 12 drives the rotating rod 11 to rotate, and the rotation of the rotating rod 11 drives the lifting frame 7 to move up and down through the spiral groove 1. When the lifting frame 7 moves upward, it will drive the pressure roller 2 8 to move upward. The upward movement of the pressure roller 2 8 will increase the vertical distance between the pressure roller 1 6, thereby facilitating the change of the film thickness by changing the vertical distance between the pressure roller 2 8 and the pressure roller 1 6, thereby improving the applicability of the equipment, wherein a winding mechanism 17 is provided on the surface of the calendering frame 3, and a tension control device for maintaining the stability of the film winding is provided on the surface of the calendering frame 3.

[0023] A limiting groove 16 is provided above the calendering frame 3, and the worm wheel 12 is arranged inside the limiting groove 16. Lubricating oil is stored inside the limiting groove 16. The lubricating oil stored inside the limiting groove 16 can effectively improve the working smoothness of the worm wheel 12 and the worm 13, and reduce the wear of the worm wheel 12 and the worm 13.

[0024] A scale is provided on the surface of the calendering frame 3, and an indicator needle is fixedly installed on the surface of the turntable 14. The thickness of the film can be conveniently adjusted through the indicator needle and the scale by rotating the turntable 14.

[0025] The bottom of the inner wall of the limiting groove 16 is set as an inclined surface, and the inner and outer walls of the limiting groove 16 are provided with drainage holes. A movable plug 18 is arranged inside the drainage hole. A cover plate 19 is slidably installed above the calendering frame 3. Maintenance personnel can conveniently replace the lubricating oil through the cover plate 19 and the movable plug 18, thereby extending the service life of the equipment and reducing subsequent maintenance costs.

[0026] When the present embodiment is working, the production raw material is processed by hot-melt extrusion through the extrusion mechanism 2, and then the servo motor 1 4 and the servo motor 2 10 are started. The output end of the servo motor 1 4 rotates to drive the preheating roller 5 to rotate. The preheating roller 5 rotates to maintain the extruded raw material at a specific stability to facilitate its plasticity. Then the raw material passes through the pressing roller 1 6 and the pressing roller 2 8, and the servo motor 2 10 is started again. The output end of the servo motor 2 10 rotates through the transmission belt to drive the pressing roller 2 8 to rotate. The pressing roller 2 8 rotates to calender the raw material under the action of the pressing roller 1 6, so that it is processed to the required thickness and is cooled and shaped under the action of the subsequent cooling roller 9. When the thickness of the film needs to be changed, the turntable 14 is rotated, and the turntable 14 rotates to drive the worm 13 to rotate, and the rotation of the worm 13 drives the worm wheel 12 to rotate, and the rotation of the worm wheel 12 drives the rotating rod 11 Rotate, the rotating rod 11 rotates through the spiral groove 1 to drive the lifting frame 7 to move up and down. When the lifting frame 7 moves upward, it will drive the pressure roller 2 8 to move upward. The upward movement of the pressure roller 2 8 will increase the vertical distance between the pressure roller 1 6, and then it is convenient to change the vertical distance between the pressure roller 2 8 and the pressure roller 1 6 to achieve the change of the film thickness, thereby improving the applicability of the equipment, and the thickness of the film can be further adjusted by setting the speed difference between the servo motor 2 10 and the servo motor 1 4, thereby improving the accuracy of the film produced by the equipment, and at the same time, the lubricating oil stored in the limiting groove 16 can effectively improve the working smoothness of the worm wheel 12 and the worm 13, and reduce the wear of the worm wheel 12 and the worm 13. At the same time, the maintenance personnel can conveniently replace the lubricating oil through the cover plate 19 and the movable plug 18, thereby extending the service life of the equipment and reducing the subsequent maintenance cost.

[0027] See also Figure 1-Figure 7On the basis of the above embodiment, in another embodiment of the present invention, the tension control device includes a fixed rod 201, a swing rod 202, a stabilizing roller 203, a support rod 204, a telescopic elastic rod 205, a receiving tube 206, an adjusting rod 207 and a sliding cutter tube 208. The film after calendering and finalization passes through the stabilizing roller 203 and is wound under the action of the winding mechanism 17. The film drives the stabilizing roller 203 to rotate. The fixed rod 201 is fixedly mounted on the outer wall of the calendering frame 3, the swing rod 202 is rotatably mounted on the circumferential surface of the fixed rod 201, and the stabilizing roller 203 rotates. The supporting rod 204 is fixedly mounted on the outer wall of the calendering frame 3, the telescopic elastic rod 205 is rotatably mounted on the circumferential surface of the supporting rod 204, the receiving tube 206 is fixedly mounted on the left and right walls of the oscillating rod 202, the adjusting rod 207 is rotatably mounted on the inner and outer walls of the receiving tube 206, the sliding cutter tube 208 is slidably mounted on the inner wall of the receiving tube 206, the telescopic elastic rod 205 will shrink and drive the stabilizing roller 203 to reverse, thereby maintaining the stability of the tension during the film production process and preventing the film from being too loose during the winding process due to changes in the tension.

[0028] A spiral groove II is provided on the circumferential surface of the adjusting rod 207, and the adjusting rod 207 is connected to the sliding cutter tube 208 by a thread. The adjusting rod 207 rotates through the spiral groove II to drive the sliding cutter tube 208 to move, and the sliding cutter tube 208 moves to change the trimming position, thereby being able to make timely adjustments according to the different positions of the two sides of the film with different thicknesses during the calendering process, further improving the applicability of the equipment.

[0029] The free end of the telescopic elastic rod 205 is rotatably connected to the circumferential surface of the stabilizing roller 203 . An arc groove is provided on the surface of the calendering frame 3 , and the arc groove facilitates the stabilizing roller 203 to rotate around the fixed rod 201 .

[0030] The protective device includes a fixed plate 211, a limit plate 212, an emergency stop button 213, a sliding rod 214, a limit rod 216 and a connecting rod 217. The receiving tube 206 rotates to contact and squeeze the limit plate 212 to move upward, and the limit plate 212 moves upward to contact and squeeze the emergency stop button 213. A sliding groove 219 is provided on the surface of the calendering frame 3. The fixed plate 211 is fixedly installed in the sliding groove 219. The limit plate 212 slides through the upper and lower walls of the fixed plate 211. The emergency stop button 213 is fixedly installed in the calendering frame 3. The fixing plate 211 is fixedly installed below the fixing plate 211, the sliding rod 214 is slidably installed on the inner wall of the sliding groove 219, the limiting rod 216 is slidably installed inside the sliding groove 219, the connecting rod 217 is rotatably installed on the surface of the limiting rod 216, and the end of the connecting rod 217 away from the limiting rod 216 is rotatably connected to the limiting plate 212. When the emergency stop button 213 is pressed, the operation of the entire equipment will be stopped to prevent the film from being torn due to excessive tension during the production process, thereby increasing the damage to the raw materials and the subsequent maintenance costs.

[0031] The emergency stop button 213 is electrically connected to the extrusion mechanism 2 , the emergency stop button 213 is electrically connected to the servo motor 1 4 , the emergency stop button 213 is electrically connected to the servo motor 2 10 , the emergency stop button 213 is electrically connected to the winding mechanism 17 , and a slot 218 is provided on the surface of the swing rod 202 .

[0032] The lower part of the limit plate 212 is set as an arc surface, the limit plate 212 is slidably connected to the inner wall of the sliding groove 219, the upper part of the limit rod 216 is set as a bevel surface, the limit rod 216 moves into the slot 218 on the surface of the swing rod 202 and limits it, so that the film maintains a taut state and effectively avoids the loosening of the film caused by the contraction of the telescopic elastic rod 205 after the equipment stops suddenly, further reducing the subsequent maintenance costs.

[0033] When the present embodiment is working, the film after calendering and finalization passes through the stabilizing roller 203 and is wound under the action of the winding mechanism 17. The film will drive the stabilizing roller 203 to rotate. When the tension of the film during the winding process is too large, the stabilizing roller 203 will be squeezed to rotate around the fixed rod 201. The rotation of the stabilizing roller 203 will stretch the telescopic elastic rod 205. When the tension becomes smaller, the telescopic elastic rod 205 will shrink and drive the stabilizing roller 203 to reverse, thereby maintaining the stability of the tension during the film production process, and avoiding the film from being too loose during the winding process due to the change of tension. At the same time, the film will contact the sliding cutter tube 208 during the winding process and perform trimming under its action, effectively making the unevenness on both sides of the film during the calendering process, reducing the subsequent processing cost. At the same time, by rotating the adjusting rod 207, the adjusting rod 207 rotates through the spiral groove 2 to drive the sliding cutter tube 208 to move, and the sliding cutter tube 208 moves to change the trimming position, thereby being able to make timely adjustments according to the different positions of both sides of the film of different thicknesses during the calendering process, further improving the applicability of the equipment.

[0034] When the film is subjected to too much tension, the stabilizing roller 203 continues to rotate, which drives the swing rod 202 to rotate. The swing rod 202 rotates and drives the receiving tube 206 to rotate around the fixed rod 201. The receiving tube 206 rotates to contact and squeeze the limit plate 212 to move upward. The limit plate 212 moves upward to contact and squeeze the emergency stop button 213. When the emergency stop button 213 is pressed, the operation of the entire equipment is stopped to prevent the film from being torn due to excessive tension during the production process, thereby increasing the damage to the raw materials and the subsequent maintenance costs, and maintaining the normal operation of the equipment. At the same time, the limit plate 212 moves upward, driving one end of the connecting rod 217 to move upward. One end of the connecting rod 217 moves upward and drives the sliding rod 214 to move toward the fixed plate 211 through the other end. The sliding rod 214 moves through the oblique surface to drive the limiting rod 216 to move toward the swing rod 202. The limiting rod 216 moves into the slot 218 on the surface of the swing rod 202 and limits the position, so that the film maintains a taut state and effectively avoids the loosening of the film caused by the contraction of the telescopic elastic rod 205 after the equipment stops suddenly, further reducing the subsequent maintenance cost.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PVC hard film production device, comprising a workbench (1), an extrusion mechanism (2) is arranged above the workbench (1), a calendering frame (3) is fixedly installed above the workbench (1), and a servo motor (4) is fixedly installed on the surface of the calendering frame (3), characterized in that: Also includes: Calendering device and protective device; The calendering device comprises a preheating roller (5), a first pressing roller (6), a lifting frame (7), a second pressing roller (8), a cooling roller (9), a second servo motor (10), a rotating rod (11), a worm wheel (12), a worm (13) and a turntable (14); the preheating roller (5) is fixedly mounted on the output end of the first servo motor (4); the first pressing roller (6) rotates to penetrate the inner and outer walls of the calendering frame (3); a lifting groove (15) is provided on the surface of the calendering frame (3); the lifting frame (7) is slidably mounted inside the lifting groove (15); the second pressing roller (8) rotates to penetrate the inner and outer walls of the lifting frame (7); the cooling roller (9) rotates to penetrate the inner and outer walls of the lifting frame (7); The servo motor 2 (10) is fixedly mounted on the outer wall of the lifting frame (7), the rotating rod (11) is rotatably mounted on the inner wall of the lifting groove (15), the worm wheel (12) is fixedly mounted on the circumferential surface of the rotating rod (11), the worm (13) rotates and penetrates the inner and outer walls of the calendering frame (3), the turntable (14) is fixedly mounted on both ends of the worm (13), the worm (13) is meshed with the worm wheel (12), a spiral groove 1 is provided on the surface of the rotating rod (11), the rotating rod (11) is connected to the lifting frame (7) by a threaded connection, and the output end of the servo motor 2 (10) is connected to the pressing roller 2 (8) and the cooling roller (9) by a transmission belt transmission; Wherein, a winding mechanism (17) is arranged on the surface of the calendering frame (3), and a tension control device for maintaining the stability of film winding is arranged on the surface of the calendering frame (3).

2. A PVC hard film production equipment according to claim 1, characterized in that: A limiting groove (16) is provided above the calendering frame (3), the worm gear (12) is arranged inside the limiting groove (16), and lubricating oil is stored inside the limiting groove (16).

3. A PVC hard film production equipment according to claim 2, characterized in that: A scale is provided on the surface of the calendering frame (3), and an indicator needle is fixedly mounted on the surface of the turntable (14).

4. The PVC hard film production equipment according to claim 3, characterized in that: The bottom of the inner wall of the limiting groove (16) is arranged as an inclined surface, the inner and outer walls of the limiting groove (16) are provided with drainage holes, a movable plug (18) is arranged inside the drainage hole, and a cover plate (19) is slidably mounted above the calendering frame (3).

5. The PVC hard film production equipment according to claim 4, characterized in that: The tension control device comprises a fixed rod (201), a swing rod (202), a stabilizing roller (203), a support rod (204), a telescopic elastic rod (205), a receiving tube (206), an adjusting rod (207) and a sliding cutter tube (208); the fixed rod (201) is fixedly mounted on the outer wall of the calendering frame (3); the swing rod (202) is rotatably mounted on the circumferential surface of the fixed rod (201); the stabilizing roller (203) is rotatably mounted to penetrate the left and right walls of the swing rod (202); the support rod (204) is fixedly mounted on the outer wall of the calendering frame (3); the telescopic elastic rod (205) is rotatably mounted on the circumferential surface of the support rod (204); the receiving tube (206) is fixedly mounted to penetrate the left and right walls of the swing rod (202); the adjusting rod (207) is rotatably mounted to penetrate the inner and outer walls of the receiving tube (206); and the sliding cutter tube (208) is slidably mounted on the inner wall of the receiving tube (206).

6. The PVC hard film production equipment according to claim 5, characterized in that: Two spiral grooves are formed on the circumferential surface of the adjusting rod (207), and the adjusting rod (207) is connected to the sliding cutter tube (208) via a thread.

7. The PVC hard film production equipment according to claim 6, characterized in that: The free end of the telescopic elastic rod (205) is rotatably connected to the circumferential surface of the stabilizing roller (203), and an arc groove is provided on the surface of the calendering frame (3).

8. The PVC hard film production equipment according to claim 7, characterized in that: The protective device comprises a fixed plate (211), a limit plate (212), an emergency stop button (213), a sliding rod (214), a limit rod (216) and a connecting rod (217); a sliding groove (219) is provided on the surface of the calendering frame (3); the fixed plate (211) is fixedly mounted inside the sliding groove (219); the limit plate (212) slides through the upper and lower walls of the fixed plate (211); the emergency stop button (213) is fixedly mounted below the fixed plate (211); the sliding rod (214) is slidably mounted on the inner wall of the sliding groove (219); the limit rod (216) is slidably mounted inside the sliding groove (219); the connecting rod (217) is rotatably mounted on the surface of the limit rod (216); and one end of the connecting rod (217) away from the limit rod (216) is rotatably connected to the limit plate (212).

9. The PVC hard film production equipment according to claim 8, characterized in that: The emergency stop button (213) is electrically connected to the extrusion mechanism (2), the emergency stop button (213) is electrically connected to the servo motor 1 (4), the emergency stop button (213) is electrically connected to the servo motor 2 (10), the emergency stop button (213) is electrically connected to the winding mechanism (17), and a slot (218) is provided on the surface of the swing rod (202).

10. The PVC hard film production equipment according to claim 9, characterized in that: The lower part of the limit plate (212) is arranged as a curved surface, the limit plate (212) is slidably connected to the inner wall of the sliding groove (219), and the upper part of the limit rod (216) is arranged as a beveled surface.

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