Calender for PVC film production
By introducing heating, speed change and adjustment mechanisms into the calender, the problems of unstable quality and low production efficiency of PVC films in the prior art are solved, and more efficient and stable PVC film production is achieved.
Patent Information
- Application Number
- CN202411425470.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-12
- Publication Date
- 2024-12-24
AI Technical Summary
In the production of PVC films, the existing calenders have unstable film quality and poor thickness and uniformity, which cannot meet high-quality needs, and have low production efficiency and lack stability and reliability.
A calender including heating, speed change and adjustment mechanism is designed. The heating mechanism ensures that the roller sleeve reaches the appropriate temperature, the speed change mechanism quickly adjusts the speed of the roller sleeve, and the adjustment mechanism accurately controls the film thickness, and improves production efficiency and quality.
It improves the finished product quality of PVC films, enhances production efficiency, ensures that the film thickness meets requirements, reduces production costs, and improves the stability and reliability of the equipment.
Smart Images
Figure CN119175830A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field related to calenders, and in particular to a calender used for producing PVC films. Background Art
[0002] PVC film has good flexibility, corrosion resistance, insulation and waterproof properties, and is widely used in many fields such as construction, packaging, printing, medical, and automobiles. With the continuous development of the plastics industry, the quality and production efficiency of PVC film are increasingly required. The transmission calender is mainly composed of two rollers. The rollers are rotated through simple mechanical transmission to calender the PVC material, which cannot meet the increasingly advanced demand for PVC film. Therefore, a calender for PVC film production is particularly needed.
[0003] However, during the use of the existing calender, when the calender calenders the PVC material, due to the simple structure and relatively single function of the calender, the quality of the finished PVC film is affected, resulting in the unstable quality of the calendered film, poor thickness and uniformity, and unable to meet the fields with high requirements for the quality of PVC film. In addition, the transmission calender has low production efficiency, lacks stability and reliability, and may delay the production efficiency of PVC film. Summary of the invention
[0004] The object of the present invention is to provide a calender for PVC film production to solve the problem of the existing calender proposed in the above background technology. During use, when the calender calenders PVC materials, due to the simple structure and relatively single function of the calender, the quality of the finished PVC film is affected, resulting in the calendered film quality is not very stable, the thickness and uniformity are poor, and it cannot meet the field with high requirements for PVC film quality. In addition, the transmission calender has low production efficiency, lacks stability and reliability, and may delay the production efficiency of PVC film.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A calender for PVC film production, comprising a first bracket, a heating mechanism is provided on one side of the first bracket, a speed change mechanism is provided on one side of the heating mechanism, an adjustment mechanism is provided on the other side of the first bracket, a fourth bracket is fixedly connected to the other side of the first bracket, a second transmission shaft is connected to one side of the fourth bracket by a bearing, a third transmission shaft is connected to the other side of the fourth bracket by a bearing, a first transmission roller is fixedly connected to one side of the second transmission shaft, a second transmission roller is fixedly connected to one side of the third transmission shaft, a third driving motor is fixedly connected to the other side of the fourth bracket, a conveyor belt is attached to one side of the first transmission roller, a side plate is fixedly connected to the other side of the first bracket, and a third transmission roller is connected to one side of the side plate by a bearing; The heating mechanism includes a first transmission shaft, a roller cover, a pressure roller sleeve, a cushion layer, a heating wire and a side box, a side bearing of the first bracket is connected to the first transmission shaft, one end of the first transmission shaft is fixedly connected to the roller cover, one side of the roller cover is fixedly connected to the pressure roller sleeve, the inner surface of the pressure roller sleeve is fixedly connected to the cushion layer, the inner surface of the cushion layer is fixedly connected to the heating wire, and a side bearing of the first transmission shaft is connected to the side box.
[0006] Preferably, the pressure roller sleeve, cushion layer, heating wire and side box are all arranged in two groups, and the cushion layer is fixedly connected to the roller cover.
[0007] Preferably, the inner surface of the pressure roller sleeve is provided with a concave structure matching the size of one side of the roller cover.
[0008] Preferably, the speed change mechanism includes a first drive motor, an input shaft, a first gear, a second gear, a synchronous gear, a third gear, a fourth gear, a fifth gear, a countershaft, a sixth gear, a seventh gear, an output shaft, a shift lever, a fixing plate and bolts. The first drive motor is fixedly connected to the surface inside the side box, and the output end of the first drive motor is fixedly connected to the input shaft. One side of the input shaft surface is bearingly connected to the first gear, and the other side of the input shaft surface is bearingly connected to the second gear, and the other side of the input shaft surface is slidingly connected to the synchronous gear. One side of the first gear is meshedly connected to the third gear, and one side of the second gear is meshedly connected to the fourth gear. The inner surface of the fourth gear is fixedly connected to the countershaft, one side of the countershaft surface is fixedly connected to the fifth gear, one side of the fifth gear is meshedly connected to the sixth gear, and one side of the fourth gear is meshedly connected to the seventh gear. One side of the side box is bearingly connected to the output shaft, one side of the side box is rotatably connected to the shift lever, and the other side of the side box is fixedly connected to the fixing plate, and one side of the shift lever is fixedly connected to the bolt.
[0009] Preferably, one side of the input shaft surface is provided with a concave structure matching the inner surface size of the synchronous gear, and one side of the first gear and the second gear surface is provided with a concave structure matching the surface size of one side of the synchronous gear.
[0010] Preferably, the third gear and the fourth gear are both fixedly connected to the secondary shaft, and the gear lever is in contact with the synchronous gear.
[0011] Preferably, the bolt is slidably connected to the fixing plate.
[0012] Preferably, the adjusting mechanism includes a first sliding block, a second sliding block, a second bracket, a connecting block, a third bracket, a second drive motor, a screw and a third sliding block; the first sliding block is fixedly connected to one side of the side box, the second sliding block is fixedly connected to the other side of the side box, the surface of the second sliding block is slidably connected to the second bracket, one side of the second bracket is fixedly connected to the connecting block, one side of the connecting block is fixedly connected to the third bracket, one end of the surface of the second bracket is fixedly connected to the second drive motor, the output end of the second drive motor is fixedly connected to the screw, and one side of the third bracket is fixedly connected to the third sliding block.
[0013] Preferably, the screw rod is threadedly connected to the third bracket, and the third bracket is connected to the first transmission shaft bearing.
[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the calender for PVC film production is provided with a heating mechanism, and when calendering the PVC material, the heating component inside the device can be provided to heat the pressing roller sleeve, so that the surface of the pressing roller sleeve reaches a temperature suitable for calendering the PVC material, thereby ensuring that the PVC material can maintain a suitable temperature and plasticity during the calendering process, thereby greatly improving the quality of the finished PVC film.
[0015] The calender for PVC film production is provided with a speed change mechanism. When calendering the PVC material, the calendering speed can be quickly adjusted according to different production process requirements by accurately controlling the rotation speed of the pressing roller sleeve, so that the pressing roller sleeve can rotate at different speeds. At the same time, the speed change mechanism of the device can realize fast gear shifting, reduce the downtime in the production process, improve the utilization rate of the equipment, and thus improve the production efficiency of the PVC film.
[0016] The calender for PVC film production is provided with an adjustment mechanism. When the PVC material is calendered, the spacing of the pressing roller sleeves can be adjusted through the adjustment mechanism, and the thickness of the PVC film during the calendering process can be accurately controlled. Films of different specifications require different thicknesses. The mechanism can achieve high-precision adjustment to ensure that the film thickness meets the requirements, thereby reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the side appearance structure of the present invention; Figure 2 It is a schematic diagram of the structure of the adjustment mechanism and the conveyor belt cooperating with each other in the present invention; Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle; Figure 4 It is a schematic diagram of the structure of the cooperation between the partial heating mechanism and the first sliding block of the present invention; Figure 5 This is a schematic diagram of the structure of the cooperation between the heating mechanism and the speed change mechanism of the present invention; Figure 6 For the present invention Figure 5 The enlarged structural diagram at B in the middle; Figure 7 This is a schematic diagram of the structure of the cooperation between the heating mechanism and the speed change mechanism of the present invention; Figure 8 For the present invention Figure 7 The enlarged structural diagram at C in the middle; Fig. 9 It is a schematic diagram of the structure of some adjustment mechanisms of the present invention; Fig.10 It is a schematic diagram of the structure of cooperation between a part of the adjustment mechanism and the first bracket of the present invention; Fig.11 It is a schematic diagram of the structure of the cooperation between the partial adjustment mechanism and the pressure roller sleeve of the present invention;.
[0018] In the figure: 1, first bracket; 2, heating mechanism; 201, first transmission shaft; 202, roller cover; 203, roller sleeve; 204, cushion layer; 205, heating wire; 206, side box; 3, speed change mechanism; 301, first drive motor; 302, input shaft; 303, first gear; 304, second gear; 305, synchronous gear; 306, third gear; 307, fourth gear; 308, countershaft; 309, fifth gear; 310, sixth gear; 311, seventh gear; 312, output Shaft; 313, shift rod; 314, fixing plate; 315, bolt; 4, adjusting mechanism; 401, first sliding block; 402, second sliding block; 403, second bracket; 404, connecting block; 405, third bracket; 406, second drive motor; 407, lead screw; 408, third sliding block; 5, fourth bracket; 6, second transmission shaft; 7, third transmission shaft; 8, first transmission roller; 9, second transmission roller; 10, third drive motor; 11, conveyor belt; 12, side plate; 13, third transmission roller. DETAILED DESCRIPTION
[0019] 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.
[0020] See also Figure 1-11 The present invention provides a technical solution: a calender for PVC film production, comprising a first bracket 1, a heating mechanism 2 is arranged on one side of the first bracket 1, a speed change mechanism 3 is arranged on one side of the heating mechanism 2, an adjustment mechanism 4 is arranged on the other side of the first bracket 1, a fourth bracket 5 is fixedly connected to the other side of the first bracket 1, a second transmission shaft 6 is connected to a bearing on one side of the fourth bracket 5, a third transmission shaft 7 is connected to a bearing on the other side of the fourth bracket 5, a first transmission roller 8 is fixedly connected to one side of the second transmission shaft 6, a second transmission roller 9 is fixedly connected to one side of the third transmission shaft 7, a third driving motor 10 is fixedly connected to the other side of the fourth bracket 5, a conveyor belt 11 is attached to one side of the first transmission roller 8, a side plate 12 is fixedly connected to the other side of the first bracket 1, and a third transmission roller 13 is connected to one side of the side plate 12; The heating mechanism 2 includes a first transmission shaft 201, a roller cover 202, a pressure roller sleeve 203, a cushion layer 204, a heating wire 205 and a side box 206. A bearing on one side of the first bracket 1 is connected to the first transmission shaft 201, one end of the first transmission shaft 201 is fixedly connected to the roller cover 202, one side of the roller cover 202 is fixedly connected to the pressure roller sleeve 203, the inner surface of the pressure roller sleeve 203 is fixedly connected to the cushion layer 204, the inner surface of the cushion layer 204 is fixedly connected to the heating wire 205, and a bearing on one side of the first transmission shaft 201 is connected to the side box 206. During use, when calendering the PVC material, the switches of the two groups of heating wires 205 can be turned on, the heating wires 205 will heat the cushion layer 204, and the cushion layer 204 will then evenly transfer the heat to the pressure roller sleeve 203. The mutual cooperation of the two groups of heating wires 205 makes the surfaces of the two groups of pressure roller sleeves 203 reach a temperature suitable for calendering the PVC material, thereby allowing the PVC The material can maintain appropriate temperature and plasticity during the calendering process, which improves the quality of the finished PVC film.
[0021] Furthermore, the pressing roller sleeve 203, the cushion layer 204, the heating wire 205 and the side box 206 are all arranged in two groups, and the cushion layer 204 is fixedly connected to the roller cover 202. Through the setting of the pressing roller sleeve 203, the cushion layer 204, the heating wire 205 and the side box 206, through the setting of two groups of pressing roller sleeves 203, the cushion layer 204, the heating wire 205 and the side box 206, the two groups of pressing roller sleeves 203 can cooperate with each other, so that the calendering of the PVC material is more sufficient. At the same time, the unification of the components is also convenient for maintenance and replacement, which improves the production efficiency of the device. Through the setting of the cushion layer 204 and the roller cover 202, the roller cover 202 can stably drive the pressing roller sleeve 203 to rotate, which is beneficial to improve the stability of the device.
[0022] Furthermore, the inner surface of the pressing roller sleeve 203 is provided with an inner concave structure matching the size of one side of the roller cover 202. Through the arrangement of the pressing roller sleeve 203 and the roller cover 202, the pressing roller sleeve 203 and the roller cover 202 can be tightly connected to prevent the pressing roller sleeve 203 from being displaced during the rotation of the roller cover 202, thereby improving the reliability of the device during operation.
[0023] Furthermore, the speed change mechanism 3 includes a first drive motor 301, an input shaft 302, a first gear 303, a second gear 304, a synchronous gear 305, a third gear 306, a fourth gear 307, a fifth gear 308, a countershaft 309, a sixth gear 310, a seventh gear 311, an output shaft 312, a shift lever 313, a fixing plate 314 and a bolt 315. The first drive motor 301 is fixedly connected to the surface inside the side box 206, the output end of the first drive motor 301 is fixedly connected to the input shaft 302, one side of the surface of the input shaft 302 is connected to the first gear 303 by a bearing, the other side of the surface of the input shaft 302 is connected to the second gear 304 by a bearing, and the other side of the surface of the input shaft 302 is slidably connected to the synchronous gear The first gear 303 is meshed with the third gear 306 on one side, the second gear 304 is meshed with the fourth gear 307 on one side, the inner surface of the fourth gear 307 is fixedly connected to the secondary shaft 308, the surface of the secondary shaft 308 is fixedly connected to the fifth gear 309 on one side, the fifth gear 309 is meshed with the sixth gear 310 on one side, the fourth gear 307 is meshed with the seventh gear 311 on one side, the output shaft 312 is connected to the bearing on one side of the side box 206, the shift rod 313 is rotatably connected to one side of the side box 206, the other side of the side box 206 is fixedly connected to the fixing plate 314, the one side of the shift rod 313 is fixedly connected to the bolt 315, during use, by starting the first drive motor 301, the first The driving motor 301 will drive the input shaft 302 to rotate, and the rotation of the input shaft 302 will drive the synchronous gear 305 to rotate. At this time, by manually rotating the shift lever 313, the shift lever 313 will drive the synchronous gear 305 to slide on the surface of the input shaft 302. When the synchronous gear 305 moves axially to one side of the second gear 304, the synchronous gear 305 rotates rapidly at this time, and the dog gear ring set on one side of the synchronous gear 305 will be engaged with the groove set on one side of the second gear 304. Before this, since the synchronous gear 305 rotates with the input shaft 302, and the first gear 303 and the second gear 304 are both connected to the bearing of the input shaft 302, at this time, the synchronous gear 305 drives the second gear 304 to rotate, and the second gear 304 is rotated. The rotation of the gear 304 will drive the fourth gear 307 to rotate, the rotation of the fourth gear 307 will drive the seventh gear 311 to rotate, the rotation of the seventh gear 311 will drive the output shaft 312 to rotate, similarly, when the synchronous gear 305 moves axially to one side of the first gear 303, the synchronous gear 305 will drive the first gear 303 to rotate, the rotation of the first gear 303 will drive the third gear 306 to rotate, the rotation of the third gear 306 will drive the countershaft 308 to rotate, the rotation of the countershaft 308 will drive the fifth gear 309 to rotate, the rotation of the fifth gear 309 will drive the sixth gear 310 to rotate, and the rotation of the sixth gear 310 will indirectly drive the output shaft 312 to rotate.In addition, the position of the gear lever 313 can be fixed by bolts 315 to prevent the gear lever 313 from being disengaged. Because the transmission ratio between the fourth gear 307 and the seventh gear 311 is greater than the transmission ratio between the fifth gear 309 and the sixth gear 310, the gear lever 313 can be manually operated to change the object driven by the synchronous gear 305 to obtain different transmission ratios, thereby obtaining different speeds of the output shaft 312, thereby achieving the purpose of adjusting the speed of the pressure roller sleeve 203.
[0024] Furthermore, one side of the surface of the input shaft 302 is provided with a concave structure that matches the inner surface size of the synchronous gear 305, and one side of the surface of the first gear 303 and the second gear 304 are both provided with a concave structure that matches the surface size of one side of the synchronous gear 305. Through the setting of the input shaft 302 and the synchronous gear 305, the synchronous gear 305 can rotate smoothly following the input shaft 302, thereby improving the operating efficiency of the device. Through the setting of the first gear 303, the second gear 304 and the synchronous gear 305, the synchronous gear 305 can smoothly drive the first gear 303 or the second gear 304 to rotate, so that the device can provide different rotation speeds according to production needs, thereby improving production efficiency.
[0025] Furthermore, the third gear 306 and the fourth gear 307 are fixedly connected to the secondary shaft 308, and the shift rod 313 is fitted with the synchronous gear 305. Through the setting of the third gear 306, the fourth gear 307 and the secondary shaft 308, the secondary shaft 308 can drive the third gear 306 and the fourth gear 307 to transmit smoothly, thereby improving the stability of the device. Through the setting of the shift rod 313 and the synchronous gear 305, the shift rod 313 can drive the synchronous gear 305 to slide on the surface of the input shaft 302, which is beneficial to adjust the rotation speed of the device.
[0026] Furthermore, the bolt 315 is slidably connected to the fixing plate 314. Through the arrangement of the bolt 315 and the fixing plate 314, the bolt 315 can fix the shift rod 313, thereby improving the reliability of the device.
[0027] Furthermore, the adjustment mechanism 4 includes a first sliding block 401, a second sliding block 402, a second bracket 403, a connecting block 404, a third bracket 405, a second drive motor 406, a screw 407 and a third sliding block 408. One side of the side box 206 is fixedly connected to the first sliding block 401, the other side of the side box 206 is fixedly connected to the second sliding block 402, the surface of the second sliding block 402 is slidably connected to the second bracket 403, one side of the second bracket 403 is fixedly connected to the connecting block 404, one side of the connecting block 404 is fixedly connected to the third bracket 405, one end of the surface of the second bracket 403 is fixedly connected to the second drive motor 406, and the output end of the second drive motor 406 is fixedly connected to the screw 407. 7. A third sliding block 408 is fixedly connected to one side of the third bracket 405. During use, the second drive motor 406 can be started, and the second drive motor 406 will drive the screw rod 407 to rotate. The rotation of the screw rod 407 will drive the third bracket 405 to move. The displacement of the third bracket 405 will drive the first transmission shaft 201 to move. At the same time, the first sliding block 401, the second sliding block 402 and the third sliding block 408 cooperate with each other, so that the third bracket 405 keeps stable with the first bracket 1 and the second bracket 403 during the displacement process. The displacement of the first transmission shaft 201 will indirectly drive the pressure roller sleeve 203 to move, so that the pressure roller sleeve 203 can be adjusted to a certain height to meet the requirement of controlling the thickness of the PVC film, thereby reducing the production cost.
[0028] Furthermore, the screw rod 407 is threadedly connected to the third bracket 405, and the third bracket 405 is connected to the bearing of the first transmission shaft 201. Through the setting of the screw rod 407 and the third bracket 405, the screw rod 407 can smoothly drive the third bracket 405 to move, so as to adjust the spacing of the pressure roller sleeve 203 and improve the production efficiency of the PVC film. Through the setting of the third bracket 405 and the first transmission shaft 201, the third bracket 405 can drive the pressure roller sleeve 203 to move, thereby realizing high-precision adjustment of the spacing of the pressure roller sleeve 203 and ensuring that the thickness of the film meets the requirements.
[0029] Working principle: During use, PVC materials with a certain temperature and plasticity can be placed on the conveyor belt 11, and by starting the third drive motor 10, the third drive motor 10 will indirectly drive the first transmission roller 8 to rotate, and the cooperation between the first transmission roller 8 and the second transmission roller 9 can drive the conveyor belt 11 to rotate, so that the PVC materials with a certain temperature and plasticity will be fed into the gap between the pressure roller sleeves 203 rotating in opposite directions by the conveyor belt 11, and will be strongly squeezed and stretched under the action of friction, so as to form a PVC film with a certain thickness and width. During the calendering process, the temperature of the roller can be turned on by turning on the switches of the two sets of heating wires 205, and the heating wires 205 will heat the cushion layer 204, and the cushion layer 204 will evenly transfer the heat to the pressure roller sleeve 203. The cooperation between the two sets of heating wires 205 makes the surfaces of the two sets of pressure roller sleeves 203 reach a temperature suitable for calendering of the PVC material, so that the PVC material can maintain a suitable temperature and plasticity during the calendering process, thereby improving the quality of the finished PVC film.
[0030] During use, during the calendering process, the object driven by the synchronous gear 305 can be changed by manually operating the shift lever 313 to obtain different transmission ratios, thereby obtaining different rotation speeds of the output shaft 312. The calendering speed can be quickly adjusted according to different production process requirements, so that the pressing roller sleeve 203 can rotate at different speeds, thereby improving the production efficiency of the PVC film.
[0031] During use, during the calendering process, the second drive motor 406 can be started, and the displacement of the first transmission shaft 201 will indirectly drive the pressure roller sleeve 203 to move, so that the pressure roller sleeve 203 can be adjusted to a certain height, and the thickness of the PVC film during the calendering process can be accurately controlled. Different specifications of films require different thicknesses. This mechanism can achieve high-precision adjustment to ensure that the film thickness meets the requirements, thereby reducing production costs.
[0032] 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 calender for producing PVC film, comprising a first bracket (1), characterized in that: A heating mechanism (2) is provided on one side of the first bracket (1), a speed change mechanism (3) is provided on one side of the heating mechanism (2), an adjustment mechanism (4) is provided on the other side of the first bracket (1), a fourth bracket (5) is fixedly connected to the other side of the first bracket (1), a second transmission shaft (6) is connected to one side of the fourth bracket (5) by a bearing, a third transmission shaft (7) is connected to the other side of the fourth bracket (5), a first transmission roller (8) is fixedly connected to one side of the second transmission shaft (6), a second transmission roller (9) is fixedly connected to one side of the third transmission shaft (7), a third drive motor (10) is fixedly connected to the other side of the fourth bracket (5), a conveyor belt (11) is attached to one side of the first transmission roller (8), a side plate (12) is fixedly connected to the other side of the first bracket (1), and a third transmission roller (13) is connected to one side of the side plate (12) by a bearing; The heating mechanism (2) comprises a first transmission shaft (201), a roller cover (202), a pressure roller sleeve (203), a cushion layer (204), a heating wire (205) and a side box (206); a bearing on one side of the first bracket (1) is connected to the first transmission shaft (201); one end of the first transmission shaft (201) is fixedly connected to the roller cover (202); one side of the roller cover (202) is fixedly connected to the pressure roller sleeve (203); the inner surface of the pressure roller sleeve (203) is fixedly connected to the cushion layer (204); the inner surface of the cushion layer (204) is fixedly connected to the heating wire (205); and a bearing on one side of the first transmission shaft (201) is connected to the side box (206).
2. A calender for PVC film production according to claim 1, characterized in that: The pressure roller sleeve (203), cushion layer (204), heating wire (205) and side box (206) are all arranged in two groups, and the cushion layer (204) is fixedly connected to the roller cover (202).
3. A calender for PVC film production according to claim 1, characterized in that: The inner surface of the pressing roller sleeve (203) is provided with an inner concave structure having a size matching that of one side of the roller cover (202).
4. A calender for PVC film production according to claim 1, characterized in that: The speed change mechanism (3) comprises a first drive motor (301), an input shaft (302), a first gear (303), a second gear (304), a synchronous gear (305), a third gear (306), a fourth gear (307), a fifth gear (308), a countershaft (309), a sixth gear (310), a seventh gear (311), an output shaft (312), a shift lever (313), a fixing plate (314) and a bolt (315); the first drive motor (301) is fixedly connected to the surface on the inner side of the side box (206); the output end of the first drive motor (301) is fixedly connected to the input shaft (302); a bearing on one side of the surface of the input shaft (302) is connected to the first gear (303); a bearing on the other side of the surface of the input shaft (302) is connected to the second gear (304); and a bearing on the other side of the surface of the input shaft (302) is connected to the second gear (304). A synchronous gear (305) is slidably connected to the side, a third gear (306) is meshedly connected to one side of the first gear (303), a fourth gear (307) is meshedly connected to one side of the second gear (304), a countershaft (308) is fixedly connected to the inner surface of the fourth gear (307), a fifth gear (309) is fixedly connected to one side of the surface of the countershaft (308), a sixth gear (310) is meshedly connected to one side of the fifth gear (309), a seventh gear (311) is meshedly connected to one side of the fourth gear (307), an output shaft (312) is connected to a bearing on one side of the side box (206), a shift lever (313) is rotatably connected to one side of the side box (206), a fixing plate (314) is fixedly connected to the other side of the side box (206), and a bolt (315) is fixedly connected to one side of the shift lever (313).
5. A calender for PVC film production according to claim 4, characterized in that: One side of the surface of the input shaft (302) is provided with an inner concave structure matching the size of the inner surface of the synchronous gear (305), and one side of the surface of the first gear (303) and the second gear (304) is provided with an inner concave structure matching the size of the surface of one side of the synchronous gear (305).
6. A calender for PVC film production according to claim 4, characterized in that: The third gear (306) and the fourth gear (307) are both fixedly connected to the secondary shaft (308), and the shift rod (313) is in close contact with the synchronous gear (305).
7. A calender for PVC film production according to claim 4, characterized in that: The bolt (315) is slidably connected to the fixing plate (314).
8. A calender for PVC film production according to claim 4, characterized in that: The regulating mechanism (4) comprises a first sliding block (401), a second sliding block (402), a second bracket (403), a connecting block (404), a third bracket (405), a second drive motor (406), a screw rod (407) and a third sliding block (408); one side of the side box (206) is fixedly connected to the first sliding block (401); the other side of the side box (206) is fixedly connected to the second sliding block (402); the surface of the second sliding block (402) is slidably connected to the second bracket (403); one side of the second bracket (403) is fixedly connected to the connecting block (404); one side of the connecting block (404) is fixedly connected to the third bracket (405); one end of the surface of the second bracket (403) is fixedly connected to the second drive motor (406); the output end of the second drive motor (406) is fixedly connected to the screw rod (407); and one side of the third bracket (405) is fixedly connected to the third sliding block (408).
9. A calender for PVC film production according to claim 8, characterized in that: The screw rod (407) is threadedly connected to the third bracket (405), and the third bracket (405) is bearing-connected to the first transmission shaft (201).