A PVC film calendering molding equipment and calendering process

Abstract

The present invention discloses a PVC film calendering and forming equipment and a calendering process, which relates to the field of PVC film calendering and forming, and comprises a preset base and a calendering docking reserved roller, wherein the upper end of the preset base is rotatably connected with two calendering docking reserved rollers, and the output end of the calendering docking reserved roller at the upper end is docked by an external motor to form a transmission structure; the outer side of the calendering docking reserved roller at the lower end is docked with an external docking turntable, and the outer side of the external docking turntable is rotatably connected with a movable guide rod. The PVC film calendering and forming equipment and the calendering process are provided with an auxiliary self-pressure relief structure, through which the high temperature pressure borne by the calendering docking reserved roller is processed, and the molding material formed on the outer side of the calendering docking reserved roller is subjected to adaptive constant temperature pressure relief processing, so as to avoid the molding material from being deformed or even broken, and the calendering rate and temperature are adaptively adjusted stably.

Description

Technical Field

[0001] The invention relates to the technical field of PVC film calendering and molding, in particular to a PVC film calendering and molding device and a calendering process. Background Art

[0002] During the processing of PVC film, it needs to go through multiple processing steps, including the calendering process; For example, the patent with publication number CN202462758U discloses a PVC film calendering machine, which includes a frame, wherein the rubber wheel is located directly above the mirror wheel, and the lower wheel surfaces of the warming wheel and the cooling wheel are located on the same horizontal line as the center of the mirror wheel. The original embossing method of the embossing wheel group is changed, and the upper and lower positions of the rubber wheel and the mirror wheel are changed. The air pits formed by the air spots of the PVC film itself are eliminated by utilizing the different final rotation directions of the PVC film, thereby solving the problem of ink absorption; Another example is a calendering system for PVC film production with a patent with publication number CN113942159B, which belongs to the field of mechanical technology. It solves technical problems such as low cleaning efficiency of existing calenders. It includes a frame, on which a number of forming rollers are arranged to rotate horizontally from top to bottom, and is characterized in that a movable table is arranged on the frame, and the movable table is connected to a driving structure that can drive it to move back and forth, and both sides of one end of the movable table have guide grooves, and a movable seat is arranged in the guide groove, and a cleaning shaft is installed horizontally between the two movable seats, and the end of the cleaning shaft is connected to a power structure that can drive it to rotate, and a U-shaped seat is fixed at the other end of the movable table, and a cloth storage shaft is arranged to rotate horizontally between the two U-shaped seats, and the cloth storage shaft is connected to one end of the cloth, and the other end of the cloth is connected to the cleaning shaft; For example, the patented PVC film pre-plasticizing calendering machine with publication number CN217729446U relates to the field of PVC film technology, and includes a support seat, the inner wall of the upright part of the support seat is provided with a guide roller, a calendering structure, a second flattening roller and a first flattening roller from top to bottom, and an adjustable limiter assembly is provided above the calendering structure, and the adjustable limiter assembly limits the PVC film on the calendering structure; through the above method, it is convenient to adjust the processing according to the needs, the flattening effect is good, wrinkles will not occur, and the integrity of the film is guaranteed; Most of the above-mentioned existing technologies improve their overall structure. During the calendering process of the existing PVC film, a large amount of heat will be generated during the calendering process. If the bearing capacity is too large during the heating and calendering, the molded material will become deformed or even cracked, and the calendering rate and temperature cannot be stably and adaptively adjusted, which results in certain limitations in use. Summary of the invention

[0003] The purpose of the present invention is to provide a PVC film calendering molding equipment and calendering process to solve the problem raised in the above background technology that due to the large amount of heat generated during the calendering process, if the bearing capacity is too large during the heating and calendering, the molded material will become deformed or even cracked, and the calendering rate and temperature cannot be stably and adaptively adjusted.

[0004] To achieve the above object, the present invention provides the following technical solution: a PVC film calendering and forming device, comprising a preset base and a calendering docking reserved roller, wherein the upper end of the preset base is rotatably connected with two calendering docking reserved rollers, and the output ends of the calendering docking reserved rollers at the upper end are docked through an external motor to form a transmission structure; The outer side of the calendering docking reserved roller at the lower end is docked with an external docking turntable, and the outer side of the external docking turntable is rotatably connected to a movable guide rod, an air storage tank is opened inside the preset base, and a supply special-shaped tube is docked on the outer side of the air storage tank, an auxiliary self-pressure relief structure is arranged between the supply special-shaped tube and the preset base, and the high-temperature pressure borne by the calendering docking reserved roller is processed by the auxiliary self-pressure relief structure; a resistance friction roller assembly is installed on the surface of the preset base, and an adaptive reverse resistance structure is arranged between the resistance friction roller assembly and the preset base, and the activity speed of the calendering docking reserved roller is adjusted by the adaptive reverse resistance structure.

[0005] Furthermore, the auxiliary self-depressurization structure is provided with a vertical guide groove, and the vertical guide groove is opened on the outer wall of the preset base, and the inner end of the vertical guide groove is nested with a nested movable part, and the nested movable part is rotatably connected to the end of the movable guide rod; the lower end of the nested movable part is docked with a reserved steel wire rope, and the reserved steel wire rope passes through the inner end of the preset base, and the inner side of the air storage tank is nested with a fitting docking piston part, and the upper end outer side of the fitting docking piston part is docked with the end of the reserved steel wire rope. Furthermore, a return spring is fixedly connected to the lower end of the fitting piston member, and the lower end of the return spring is butted against the inner side of the air storage tank, and a bottom reserved through hole is provided on the inner side of the air storage tank.

[0006] Furthermore, the external docking turntable drives the movable guide rod to form a rotating structure, and the movable guide rod cooperates with the nested movable part to form a vertical sliding structure along the vertical guide groove, and cooperates with the nested movable part to drive the fitting docking piston part through the reserved steel wire rope along the inner side of the air storage groove to form a nested fitting structure. The gas inside the air storage groove is supplied to the outside by the supply special-shaped tube through the negative pressure of the fitting docking piston part, and after the fitting docking piston part is reset, the inner side of the air storage groove re-stores air through the reserved through hole at the bottom.

[0007] Furthermore, the adaptive reverse interference structure is provided with a guide bevel gear assembly, and the guide bevel gear assembly is nested and installed on the inner wall of a preset base, the outer side of the built-in thermal conductive airbag is docked with a transverse nested docking piece, and the outer end of the transverse nested docking piece is meshed and docked with a first sprocket guide belt, and the end of the first sprocket guide belt is meshed and docked with the outer side of the guide bevel gear assembly.

[0008] Furthermore, the inner side of the preset base is rotatably connected to two vertically docked preset bevel gear assemblies, and the shaft end of the vertical preset bevel gear assembly is meshed and docked with the second sprocket guide belt, and the upper end of the second sprocket guide belt is meshed and docked with the shaft end of the calender docking reserved roller.

[0009] Furthermore, the calendering docking reserved roller drives the vertical preset bevel gear assembly to mesh and rotate through the second sprocket guide belt. During the long-term heating of the calendering docking reserved roller by the friction roller assembly, the built-in heat-conducting airbag on its inner side expands laterally due to the heat, pushing the laterally nested docking parts and the guide bevel gear assembly to move outward synchronously.

[0010] Furthermore, an electric push rod assembly may be provided on the inner side of the friction roller assembly, and a transversely nested docking piece may be nested and docked at the output end of the electric push rod assembly. The position of the transversely nested docking piece may be adaptively adjusted by cooperating with the electric push rod assembly and a preset temperature sensor.

[0011] A PVC film calendering molding device and a calendering process of the PVC film calendering molding device are disclosed. The specific method steps are as follows: S1: The external docking turntable docked at the outer end of the calender docking reserved roller drives the movable guide rod to rotate back and forth, so that the movable guide rod cooperates with the nested movable parts to interact up and down along the vertical guide groove, so that the gas inside it is supplied to the outside through the negative pressure of the fitting docking piston part through the supply profile pipe, and the molding material formed on the outer side of the calender docking reserved roller is subjected to adaptive constant temperature pressure relief treatment; S2: After the fitting piston member is reset downward along the inner side of the air storage groove, the inner side of the air storage groove re-stores air through the through hole reserved at the bottom, so that the supply profile tube can stably perform reciprocating air supply and constant temperature downward movement processing; S3: The built-in heat-conducting airbag on the inner side of the friction roller assembly expands laterally due to the heat, pushing the laterally nested docking parts and the guide bevel gear assembly to move outward synchronously, allowing the guide bevel gear assembly to engage and rotate with the vertical preset bevel gear assembly, and then stably allowing the friction roller assembly to have reverse friction contact with the calender docking reserved roller. As the temperature rises, the active transmission force friction of the calender docking reserved roller is adaptively decelerated.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The PVC film calendering molding equipment and calendering process are provided with an auxiliary self-pressure relief structure, through which the high-temperature pressure borne by the calendering docking reserved roller is processed. During the process of the calendering docking reserved roller calendering the material, the external docking turntable docked at the outer end thereof will drive the movable guide rod to rotate back and forth, so that the movable guide rod cooperates with the nested movable parts to interact up and down along the vertical guide groove, and the nested movable parts will then drive the fitting docking piston parts to reciprocate outward along the inner side of the air storage groove through the reserved steel wire rope to perform negative pressure treatment, so that the gas inside it is supplied to the outside through the negative pressure of the fitting docking piston parts by the supply profile pipe, so that the molding material formed on the outer side of the calendering docking reserved roller is subjected to adaptive constant temperature pressure relief treatment, so as to avoid the molding material from being deformed or even ruptured, and stably perform adaptive adjustment of the calendering rate and temperature; Furthermore, after the fitting piston member is reset downward along the inner side of the air storage tank, the inner side of the air storage tank re-stores air through the through hole reserved at the bottom, so that the supply profile tube can stably perform a reciprocating air supply and constant temperature downward movement process; Furthermore, an adaptive reverse conflict structure is provided, through which the activity rate of the calendering docking reserved roller is adjusted. During the long-term heating process of the friction roller assembly in contact with the calendering docking reserved roller, the built-in heat-conducting airbag inside is heated and expanded laterally, pushing the transversely nested docking parts and the guide bevel gear assembly to move outward synchronously, thereby allowing the guide bevel gear assembly to mesh with the vertical preset bevel gear assembly and contact and rotate, and then stably allowing the friction roller assembly to have reverse friction contact with the calendering docking reserved roller. Then, as the temperature rises, the friction deceleration of the activity transmission force of the calendering docking reserved roller is adaptively reduced, thereby avoiding the phenomenon of excessively fast conduction of the molding material and uneven molding, thereby improving the molding efficiency of the device; Furthermore, an electric push rod assembly and a temperature sensor can be installed on the inner side of the friction roller assembly to replace the built-in thermal airbag, so that the temperature inside the friction roller assembly can be detected by the temperature sensor. When the temperature exceeds the limit, the electric push rod assembly is driven to push the guide bevel gear assembly to engage, thereby meeting the subsequent pressure relief and speed reduction work, thereby improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of a half-cut three-dimensional structure of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the partially enlarged structure; Figure 3 It is a schematic diagram of a partial three-dimensional structure of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the built-in heat-conducting airbag of the present invention; Figure 5 Provide a schematic diagram of the three-dimensional structure of a special-shaped tube for the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the external docking turntable of the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of the electric push rod assembly of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the butted piston member of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the first sprocket guide belt of the present invention.

[0014] In the figure: 1. Preset base; 2. Reserved roller for calender docking; 3. External docking turntable; 4. Movable guide rod; 5. Nested movable parts; 6. Vertical guide groove; 7. Reserved steel wire rope; 8. Fitting docking piston; 9. Accommodating air storage groove; 10. Reserved through hole at the bottom; 11. Reset spring; 12. Supply of special-shaped tube; 13. Guide bevel gear assembly; 14. Resisting friction roller assembly; 15. Built-in heat-conducting airbag; 16. Laterally nested docking parts; 17. First sprocket guide belt; 18. Preset bevel gear assembly; 19. Second sprocket guide belt; 20. Electric push rod assembly. DETAILED DESCRIPTION

[0015] 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.

[0016] Example 1: Please refer to Figure 1-9The present invention provides the following technical solutions: a PVC film calendering molding equipment and calendering process, including a preset base 1, a calendering docking reserved roller 2, an external docking turntable 3, a movable guide rod 4, a nested movable part 5, a vertical guide groove 6, a reserved steel wire rope 7, a fitting docking piston part 8, a gas storage tank 9, a bottom reserved through hole 10, a reset spring 11, a supply special-shaped tube 12, a guide bevel gear assembly 13, a friction roller assembly 14, a built-in heat-conducting airbag 15, a transversely nested docking part 16, a first sprocket guide belt 17, a preset bevel gear assembly 18, a second sprocket guide belt 19 and an electric push rod assembly 2 0; The upper end of the preset base 1 is rotatably connected with two calendering docking reserved rollers 2, and the output end of the calendering docking reserved roller 2 at the upper end is docked through an external motor to form a transmission structure; the outer side of the calendering docking reserved roller 2 at the lower end is docked with an external docking turntable 3, and the outer side of the external docking turntable 3 is rotatably connected with a movable guide rod 4, and an accommodating air storage tank 9 is provided inside the preset base 1, and the outer side of the accommodating air storage tank 9 is docked with a supply profiled tube 12, and an auxiliary self-pressure relief structure is provided between the supply profiled tube 12 and the preset base 1, and the high temperature pressure borne by the calendering docking reserved roller 2 is processed by the auxiliary self-pressure relief structure; The auxiliary self-decompression structure is provided with a vertical guide groove 6, and the vertical guide groove 6 is opened on the outer wall of the preset base 1, and the inner end of the vertical guide groove 6 is nested with a nested movable member 5, and the nested movable member 5 is rotatably connected to the end of the movable guide rod 4; The lower end of the nested movable part 5 is docked with a reserved steel wire rope 7, and the reserved steel wire rope 7 passes through the inner end of the preset base 1, and a fitting piston part 8 is nested and installed on the inner side of the air storage groove 9, and the outer side of the upper end of the fitting piston part 8 and the end of the reserved steel wire rope 7 are docked with each other, and the lower end of the fitting piston part 8 is fixedly connected with a return spring 11, and the lower end of the return spring 11 is docked with the inner side of the air storage groove 9, and a bottom reserved through hole 10 is opened on the inner side of the air storage groove 9. The external docking turntable 3 drives the movable guide rod 4 to form a rotating structure, and the movable guide rod 4 cooperates with the nested movable part 5 to form a vertical sliding structure along the vertical guide groove 6, and cooperates with the nested movable part 5 to drive the fitting docking piston part 8 through the reserved steel wire rope 7 along the inner side of the accommodating air storage groove 9 to form a nested fitting structure. The gas inside the accommodating air storage groove 9 is supplied to the outside by the supply special-shaped tube 12 through the negative pressure of the fitting docking piston part 8, and after the fitting docking piston part 8 is reset, the inner side of the accommodating air storage groove 9 re-stores air through the reserved through hole 10 at the bottom. During the process of calendering the material by the calendering and docking reserved roller 2, the external docking turntable 3 docked at its outer end will drive the movable guide rod 4 to rotate back and forth, so that the movable guide rod 4 cooperates with the nested movable part 5 to interact reciprocally up and down along the vertical guide groove 6, and the nested movable part 5 will then drive the fitting and docking piston part 8 through the reserved steel wire rope 7 to reciprocate outward along the inner side of the accommodating air storage groove 9 for negative pressure treatment, so that the gas inside it is supplied to the outside by the supply special-shaped tube 12 through the negative pressure of the fitting and docking piston part 8, so that the molding material formed on the outside of the calendering and docking reserved roller 2 is adaptively subjected to constant temperature pressure relief treatment, so as to avoid the molding material from being deformed or even ruptured, and to stably and adaptively adjust the calendering rate and temperature thereof; after the fitting and docking piston part 8 is reset downward along the inner side of the accommodating air storage groove 9, the inner side of the accommodating air storage groove 9 re-accumulates air through the reserved through hole 10 at the bottom, so that the supply special-shaped tube 12 can stably perform reciprocating air supply and constant temperature downward treatment.

[0017] Embodiment 2: Based on Embodiments 1 and 2, an adaptive reverse conflict structure is also disclosed, and its specific contents are as follows; A friction roller assembly 14 is installed on the surface of the preset base 1, and an adaptive reverse friction structure is provided between the friction roller assembly 14 and the preset base 1, and the activity speed of the calendering docking reserved roller 2 is adjusted by the adaptive reverse friction structure.

[0018] The adaptive reverse conflict structure is provided with a guide bevel gear assembly 13, and the guide bevel gear assembly 13 is nested and installed on the inner wall of the preset base 1, and the inner side of the conflict friction roller assembly 14 is docked with a built-in heat-conducting airbag 15, and the outer side of the built-in heat-conducting airbag 15 is docked with a transversely nested docking piece 16, and the outer end of the transversely nested docking piece 16 is meshed and docked with a first sprocket guide belt 17, and the end of the first sprocket guide belt 17 is meshed and docked with the outer side of the guide bevel gear assembly 13. The inner side of the preset base 1 is rotatably connected with two vertically docked preset bevel gear assemblies 18, and the shaft end of the vertical preset bevel gear assembly 18 is meshed and docked with a second sprocket guide belt 19, and the upper end of the second sprocket guide belt 19 is meshed and docked with the shaft end of the calender docking reserved roller 2. The calendering docking reserved roller 2 drives the vertical preset bevel gear assembly 18 to mesh and rotate through the second sprocket guide belt 19. During the long-term heating of the calendering docking reserved roller 2 in contact with the friction roller assembly 14, the built-in heat-conducting air bag 15 on its inner side expands laterally due to the heat, pushing the laterally nested docking piece 16 and the guide bevel gear assembly 13 to move outward synchronously.

[0019] An electric push rod assembly 20 may also be provided inside the friction roller assembly 14, and a transversely nested docking piece 16 is nested and docked at the output end of the electric push rod assembly 20. The electric push rod assembly 20 cooperates with a preset temperature sensor to adaptively adjust the position of the transversely nested docking piece 16. During the long-term heating process of the friction roller assembly 14 in contact with the calender docking reserved roller 2, the built-in heat-conducting airbag 15 inside it expands laterally due to the heat, pushing the transversely nested docking piece 16 and the guide bevel gear assembly 13 to move outward synchronously, thereby allowing the guide bevel gear assembly 13 to mesh with the vertical preset bevel gear assembly 18 and rotate, and then stably allowing the friction roller assembly 14 to have reverse friction contact with the calender docking reserved roller 2, and then as the temperature rises, the active transmission force friction of the calender docking reserved roller 2 is adaptively decelerated, thereby avoiding the phenomenon of uneven molding due to excessively fast conduction of the molding material.

[0020] Embodiment 2: Based on Embodiments 1 and 2, a calendering process of a PVC film calendering molding device is also disclosed, and the specific method steps are as follows: S1: The external docking turntable 3 docked at the outer end of the calendering docking reserved roller 2 drives the movable guide rod 4 to rotate back and forth, so that the movable guide rod 4 cooperates with the nested movable part 5 to interact up and down along the vertical guide groove 6, so that the gas inside it is supplied to the outside through the negative pressure of the fitting docking piston part 8 through the supply special-shaped tube 12, and the molding material molded on the outer side of the calendering docking reserved roller 2 is subjected to adaptive constant temperature pressure relief treatment; S2: After the fitting piston 8 is reset downward along the inner side of the air storage groove 9, the inner side of the air storage groove 9 re-stores air through the through hole 10 reserved at the bottom, so that the supply profiled tube 12 can stably perform a reciprocating air supply and constant temperature downward movement process; S3: The built-in heat-conducting airbag 15 on the inner side of the friction roller assembly 14 expands laterally due to the heat, pushing the laterally nested docking piece 16 and the guide bevel gear assembly 13 to move outward synchronously, allowing the guide bevel gear assembly 13 to engage and rotate with the vertical preset bevel gear assembly 18, thereby stabilizing the reverse friction contact between the friction roller assembly 14 and the calendering docking reserved roller 2, and then as the temperature rises, the active transmission force friction of the calendering docking reserved roller 2 is adaptively decelerated.

[0021] Embodiment 2: Based on Embodiments 1 and 2, an electric push rod assembly 20 is also disclosed, and its specific contents are as follows: An electric push rod assembly 20 can also be installed on the inner side of the friction roller assembly 14 to cooperate with a temperature sensor to replace the built-in heat-conducting airbag 15, so that the temperature inside the friction roller assembly 14 can be detected by the temperature sensor. When the temperature is over, the electric push rod assembly 20 is driven to push the guide bevel gear assembly 13 to engage, thereby meeting the subsequent pressure relief and speed reduction work.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A PVC film calendering and forming device, comprising a preset base (1) and a calendering butt-jointed reserved roller (2), wherein the upper end of the preset base (1) is rotatably connected to two calendering butt-jointed reserved rollers (2), and the output ends of the upper calendering butt-jointed reserved rollers (2) are butt-jointed via an external motor to form a transmission structure; Features: The outer side of the calendering butt-jointing reserved roller (2) at the lower end is butted against an external butt-jointing turntable (3), and the outer side of the external butt-jointing turntable (3) is rotatably connected to a movable guide rod (4), an air storage tank (9) is provided inside the preset base (1), and the outer side of the air storage tank (9) is butt-jointed against a supply profiled tube (12), and an auxiliary self-pressure relief structure is provided between the supply profiled tube (12) and the preset base (1), and the high-temperature pressure borne by the calendering butt-jointing reserved roller (2) is processed by the auxiliary self-pressure relief structure; A friction roller assembly (14) is installed on the surface of the preset base (1), and an adaptive reverse friction structure is provided between the friction roller assembly (14) and the preset base (1), and the activity speed of the calendering butt-jointing reserved roller (2) is adjusted by the adaptive reverse friction structure.

2. A PVC film calendering equipment according to claim 1, characterized in that: The auxiliary self-decompression structure is provided with a vertical guide groove (6), and the vertical guide groove (6) is opened on the outer wall of the preset base (1), and a nesting movable part (5) is nested and installed at the inner end of the vertical guide groove (6), and the nesting movable part (5) is rotatably connected to the end of the movable guide rod (4); The lower end of the nested movable part (5) is butt-jointed with a reserved steel wire rope (7), and the reserved steel wire rope (7) passes through the inner end of the preset base (1); a fitting butt-jointed piston part (8) is nested and installed on the inner side of the air storage tank (9), and the outer side of the upper end of the fitting butt-jointed piston part (8) is butt-jointed with the end of the reserved steel wire rope (7).

3. A PVC film calendering equipment according to claim 2, characterized in that: A return spring (11) is fixedly connected to the lower end of the fitting piston member (8), and the lower end of the return spring (11) is butted against the inner side of the air storage groove (9), and a bottom reserved through hole (10) is provided on the inner side of the air storage groove (9).

4. A PVC film calendering equipment according to claim 3, characterized in that: The external docking turntable (3) drives the movable guide rod (4) to form a rotating structure, and the movable guide rod (4) cooperates with the nested movable part (5) to form a vertical sliding structure along the vertical guide groove (6), and the nested movable part (5) cooperates with the nested movable part (5) through the reserved steel wire rope (7) to drive the fitting docking piston part (8) along the inner side of the accommodating gas storage groove (9) to form a nested fitting structure, and the gas inside the accommodating gas storage groove (9) is supplied to the outside through the supply special-shaped pipe (12) through the negative pressure of the fitting docking piston part (8), and after the fitting docking piston part (8) is reset, the inner side of the accommodating gas storage groove (9) re-accumulates gas through the reserved through hole (10) at the bottom.

5. The PVC film calendering equipment according to claim 3, characterized in that: The adaptive reverse abutment structure is provided with a guide bevel gear assembly (13), and the guide bevel gear assembly (13) is nested and installed on the inner wall of the preset base (1), the inner side of the abutment friction roller assembly (14) is butted with a built-in heat-conducting airbag (15), the outer side of the built-in heat-conducting airbag (15) is butted with a transversely nested abutment piece (16), and the outer end of the transversely nested abutment piece (16) is meshedly butted with a first sprocket guide belt (17), and the end of the first sprocket guide belt (17) is meshedly butted with the outer side of the guide bevel gear assembly (13).

6. A PVC film calendering equipment according to claim 5, characterized in that: The inner side of the preset base (1) is rotatably connected to two vertically docked preset bevel gear assemblies (18), and the shaft end of the vertical preset bevel gear assembly (18) is meshed and docked with a second sprocket guide belt (19), and the upper end of the second sprocket guide belt (19) is meshed and docked with the shaft end of the calender docking reserved roller (2).

7. A PVC film calendering device according to claim 6, characterized in that: The calendering butt joint reserved roller (2) drives the vertical preset bevel gear assembly (18) to mesh and rotate via the second sprocket guide belt (19); when the friction roller assembly (14) contacts the calendering butt joint reserved roller (2) and is heated for a long time, the built-in heat-conducting airbag (15) inside the roller expands laterally due to the heat, pushing the transversely nested butt joint piece (16) and the guide bevel gear assembly (13) to move outward synchronously.

8. A PVC film calendering device according to claim 7, characterized in that: An electric push rod assembly (20) may also be installed on the inner side of the friction roller assembly (14), and a transversely nested docking piece (16) is nested and docked at the output end of the electric push rod assembly (20), and the position of the transversely nested docking piece (16) is adaptively adjusted by cooperating with the electric push rod assembly (20) and a preset temperature sensor.

9. A PVC film calendering device according to claim 8, characterized in that: Also disclosed is a calendering process of a PVC film calendering molding device, and the specific method and steps are as follows: S1: The external docking turntable (3) docked at the outer end of the calender docking reserved roller (2) drives the movable guide rod (4) to rotate back and forth, so that the movable guide rod (4) cooperates with the nested movable part (5) to interact and reciprocate up and down along the vertical guide groove (6), so that the gas inside it is supplied to the outside through the negative pressure of the fitting docking piston part (8) through the supply special-shaped tube (12), and the molding material molded on the outer side of the calender docking reserved roller (2) is subjected to adaptive constant temperature pressure relief treatment; S2: After the fitted piston member (8) is reset downward along the inner side of the air storage groove (9), the inner side of the air storage groove (9) re-stores air through the through hole (10) reserved at the bottom, thereby allowing the supply profile tube (12) to stably perform a reciprocating air supply and constant temperature downward movement process; S3: The built-in heat-conducting airbag (15) on the inner side of the friction roller assembly (14) expands laterally due to heat, pushing the transversely nested docking member (16) and the guide bevel gear assembly (13) to move outward synchronously, allowing the guide bevel gear assembly (13) to mesh with the vertical preset bevel gear assembly (18) and rotate, thereby stabilizing the reverse friction contact between the friction roller assembly (14) and the calender docking reserved roller (2), and then adaptively reducing the frictional speed of the moving transmission force of the calender docking reserved roller (2) as the temperature rises.

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