Plastic sheet calender

Abstract

A calendering mechanism of the plastic sheet calender comprises a front roller device, a middle roller device and a rear roller device, a land wheel device of a debugging mechanism is arranged on a longitudinal ground rail, the front roller device comprises a front calendering roller, a front supporting seat and a front roller driving part, and the middle roller device comprises a middle calendering roller, a middle supporting seat and a middle roller driving part. The rear roller device comprises a rear calendering roller, a rear supporting seat and a rear roller driving component, the middle supporting seat is arranged on the memorial archway, a front displacement guide rail and a rear displacement guide rail are further arranged on the memorial archway, the front supporting seat is arranged on the front displacement guide rail, the rear supporting seat is arranged on the rear displacement guide rail, and the middle calendering roller is arranged between the front calendering roller and the rear calendering roller. A front seat shifting transmission device and a rear seat shifting transmission device are further arranged on the memorial archway. And a front-middle-rear three-roller calendering structure is arranged in the calendering mechanism, so that the coiled plastic sheets can be conveniently penetrated and arranged, and the thickness of the calendered sheets can be adjusted in a matched manner. And the debugging mechanism enables the whole rack memorial archway to be matched on the longitudinal ground rail to adjust the position by utilizing the ground wheel device.

Description

Technical Field

[0001] This invention relates to plastic sheet calendering machines. Background Technology

[0002] Plastic sheet calendering machines are the main equipment for producing plastic sheets. They can be used to produce continuous rolls of plastic sheets as materials and can be integrated into production lines for molding disposable plastic cups, plastic boxes, and other plastic products (including plastic product thermoforming machines).

[0003] As a material, continuously rolled plastic sheets are extruded from a sheet extruder and then enter a plastic sheet calender. The material is clamped by the corresponding calendering rollers of the plastic sheet calender, and the sheets are calendered by the rollers working together. A corresponding winding device can be configured for winding. The structural layout of the calendering rollers of the plastic sheet calender is crucial. It is necessary to control the pressure between the calendering rollers to regulate the thickness specifications of the calendered sheets to meet the molding requirements of different plastic products. In addition, it is necessary to improve the stability of the plastic sheet calender during operation to avoid shaking and indentation on the smooth surface of the material, which would affect the quality of the sheets. Summary of the Invention

[0004] In view of the technical problems existing in the background art, the present invention aims to provide a plastic sheet calender that is better adapted to production.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a plastic sheet calendering machine, comprising a calendering mechanism and an adjustment mechanism. The calendering mechanism includes a front roller assembly, a middle roller assembly, and a rear roller assembly. The adjustment mechanism includes longitudinal ground rails below the left and right arches. The machine is characterized in that: ground wheel assemblies are respectively provided in the lower areas before and after each arch, and the ground wheel assemblies are configured on the longitudinal ground rails. The front roller assembly includes a front calendering roller, a front support seat, and a front roller drive component. The front calendering roller is configured on the front support seat, and the front roller drive component is connected to the front support seat. The front calendering roller and the front roller drive component are connected in a driving connection. The middle roller assembly includes a middle calendering roller, a middle support seat, and a middle roller drive component. The middle calendering roller is configured on the middle support seat, and the middle roller drive component is connected to the middle support seat. The upper part of the assembly includes a middle calendering roll connected to a middle roll drive component. The rear roll assembly includes a rear calendering roll, a rear support seat, and a rear roll drive component. The rear calendering roll is mounted on the rear support seat, and the rear roll drive component is connected to the rear support seat. The rear calendering roll is connected to the rear roll drive component. The middle support seat is mounted on a gate, which is also equipped with a front shift guide rail and a rear shift guide rail. The front support seat is mounted on the front shift guide rail, and the rear support seat is mounted on the rear shift guide rail. The front support seat and the rear support seat are located in front of and behind the middle support seat, respectively. The middle calendering roll is positioned between the front calendering roll and the rear calendering roll. The gate is also equipped with a front seat shift transmission device and a rear seat shift transmission device. The front seat shift transmission device is connected to the front support seat, and the rear seat shift transmission device is connected to the rear support seat.

[0006] The following optimizations or supplementary explanations can be made to the above technical solutions.

[0007] For example, the ground wheel device includes a support frame and a ground wheel body. The ground wheel body is installed and connected to the support frame and is arranged on the longitudinal ground rail. A lifting guide pair is provided between the support frame and the archway. The support frame is also equipped with a lifting transmission device, which is connected to the archway. The front and rear of each archway are respectively erected on the corresponding support frame through the lifting transmission device.

[0008] Further optimization includes a horizontal connecting plate connecting the left and right archways; the longitudinal ground rails are arranged side by side, with the longitudinal ground rails running longitudinally front and back; the ground wheel devices are arranged in double rows front and back, and the left and right ground wheel devices are arranged side by side; the ground wheel devices that are relatively in front and / or relatively behind also include a drive shaft, which is mounted on the support frame and is connected to the ground wheel body for transmission. The ground wheel body is connected to the ground wheel axle, the ground wheel axle is set on the support frame, the ground wheel body is connected to the transmission wheel, the transmission wheel is set on the same axis as the ground wheel body, the drive shaft is equipped with a drive wheel, and the drive wheel is connected to the transmission wheel for transmission.

[0009] In addition, the support frame includes a housing, a ground wheel axle mounted on the housing, a drive shaft mounted on the housing, the ground wheel body located inside the housing, a transmission wheel located inside the housing, and a drive wheel located inside the housing. The drive shafts of the left and right parallel ground wheel devices are arranged laterally, and the drive shafts of the left and right parallel ground wheel devices are connected to each other by a first synchronous shaft. The first synchronous shaft is connected to the left and right drive shafts respectively through a first coupling. The drive shaft on the left or right side is connected to a drive component, which includes a reducer equipped with a drive motor or a manual drive operating component. The lifting guide pair includes a vertical guide rail and a slider that are connected in a mating manner. The vertical guide rail is mounted on the archway, and the slider is mounted on the support frame. The lifting transmission device includes a worm gear screw jack. The screw of the screw jack is vertically arranged; the axis of the worm of the screw jack is horizontally arranged. The worms of the left and right screw jacks are connected to each other by a second synchronous shaft, and the second synchronous shaft is connected to the left and right worms by a second coupling. One of the left and right screw jacks has a power motor connected to its worm, while the other screw has a manual drive mechanism. The top of the support frame is equipped with a first fixed seat, and the screw of the screw jack is connected to the first fixed seat. A second fixed seat is provided on the archway, located above the first fixed seat. The body of the screw jack is connected to the second fixed seat, and the screw jack is positioned between the first and second fixed seats.

[0010] For example, the front and rear shift guides are both linear guides, and are positioned at the front and rear of the central support. The front and rear calendering rolls are arranged with the front lower than the rear. The front shift guides are arranged horizontally longitudinally, while the rear shift guides are arranged at varying heights. The central support is fixedly installed on the archway. The line connecting the center of the front calendering roll and the center of the middle calendering roll is parallel to the front shift guide, and the line connecting the center of the middle calendering roll and the center of the rear calendering roll is parallel to the rear shift guide. The front and rear shift guides are mounted on the upper edge of the archway, and the central support is mounted on the upper edge of the archway.

[0011] For example, the front seat shifting transmission device includes a front seat shifting drive component, which is connected and installed on the archway. The front seat shifting drive component is connected to the front part of the front support seat, and a front seat rearward movement and approach limit adjustment device is provided between the rear part of the front support seat and the archway or the middle support seat. The rear seat shifting transmission device includes a rear seat shifting drive component, which is connected and installed on the archway. The rear seat shifting drive component is connected to the rear part of the rear support seat, and a rear seat forward movement and approach limit adjustment device is provided between the front part of the rear support seat and the archway or the middle support seat.

[0012] For example, the front seat rearward movement and the rear seat forward movement and the corresponding limit adjustment device both employ inclined block adjustment devices. The inclined block adjustment device includes a displacement adjustment block with an inclined surface and a pressing component facing the inclined surface; the pressing component adopts a pressing block, and corresponding pressing components are respectively set at the rear of the front support and the front of the rear support. The archway on the front side of the rear support and the front side of the middle support are respectively set with displacement adjustment blocks, and the displacement adjustment blocks are connected to the lifting and shifting drive component.

[0013] For example, the front seat rearward movement and engagement limiting adjustment device includes a first displacement adjusting block and a first pressing component. The first displacement adjusting block is disposed on the archway or the middle support base, and the first pressing component is disposed at the rear of the front support base. The first displacement adjusting block is disposed behind the first pressing component, and the first pressing component faces the inclined surface of the first displacement adjusting block. The rear seat forward movement and engagement limiting adjustment device includes a second displacement adjusting block and a second pressing component. The second displacement adjusting block is disposed on the archway or the middle support base, and the second pressing component is disposed at the front of the rear support base. The second displacement adjusting block is disposed in front of the second pressing component, and the second displacement adjusting block faces the inclined surface of the second pressing component.

[0014] Supplementary explanation: A first slide rail and a second slide rail are distributed on the archway and / or the central support base. A first displacement adjusting block is configured on the first slide rail, and a second displacement adjusting block is configured on the second slide rail. The first displacement adjusting block is configured for lifting and shifting adjustment, and the second displacement adjusting block is configured for lifting and shifting adjustment. The first slide rail is orthogonal to the front displacement guide rail, and the second slide rail is orthogonal to the rear displacement guide rail. The first displacement adjusting block is drivenly connected to the first lifting and shifting adjustment device, and the second displacement adjusting block is drivenly connected to the second lifting and shifting adjustment device. The first lifting and shifting adjustment device and the second lifting and shifting adjustment device are respectively selected as worm gear screw jacks.

[0015] In addition, a first bearing is provided between the front support and the front calendering roll. The front roll drive component includes a first motor, a first reducer, and a front connecting flange plate. The first motor is driven and mounted on the first reducer. The front connecting flange plate has a first flange ring. The output port of the first reducer is connected to the first flange ring. The front connecting flange plate is connected to the front support. The front connecting flange plate also has a first lower extension, which is located below the first flange ring. The first lower extension is connected to the housing of the first reducer by a first connecting rod. The first motor is located outside the first connecting rod. A second bearing is provided between the middle support and the middle calendering roll. The middle roll drive component includes a second motor and a second reducer. The second motor is driven and mounted on the second reducer. The output port of the second reducer... The port is connected to the input port of the middle support. A second connecting rod is also connected between the archway and the housing of the second reducer. The second connecting rod is located below the middle support, and the second motor is located outside the second connecting rod. A third bearing is provided between the rear support and the rear calendering roll. The rear roll drive component includes a third motor, a third reducer, and a rear connecting flange plate. The third motor is driven and installed on the third reducer. The rear connecting flange plate has a second flange ring. The output port of the third reducer is connected to the second flange ring. The rear connecting flange plate is connected to the rear support. The rear connecting flange plate also has a second lower extension. The second lower extension is located below the second flange ring. The second lower extension is connected to the housing of the third reducer by the third connecting rod. The third motor is located outside the third connecting rod.

[0016] The beneficial effects of this invention are as follows: the plastic sheet calender has a calendering mechanism and an adjustment mechanism. The calendering mechanism has a front, middle, and rear three-roll calendering structure on the arch, which has a reasonable structural layout, facilitates the feeding and arrangement of continuously rolled plastic sheets, and can also be used to adjust the thickness of the calendered sheet. The gap between the front calendering roll and the middle calendering roll is used for the first calendering, and the gap between the middle calendering roll and the rear calendering roll is used for the second calendering. The front calendering roll and the rear calendering roll can be moved forward and backward respectively, which not only separates them from the middle calendering roll to facilitate the feeding and arrangement of the sheet, but also allows for adjustment of the gap between them, thereby adjusting the calendering pressure (between the rolls) to adjust the thickness of the calendered sheet, which can meet the requirements of different sheet thicknesses when making cups from plastic products. Furthermore, its adjustment mechanism allows the entire frame archway to be adjusted in position on the longitudinal ground rail using the ground wheel device. This enables the longitudinal and rear-to-rear relative position adjustment of the left and right archways and the entire plastic sheet calender. This allows for rearward movement to make room for sheet extruder adjustments, manual cleaning, and other operations. After the operation is completed, it can be moved forward to receive the extruded sheet material below the sheet extruder's discharge end, allowing for adjustment of the longitudinal and rear-to-rear relative position of the left and right archways and the entire plastic sheet calender. After adjustment, the sheet material from the sheet extruder can be accurately positioned between the front and middle calender rollers. With further optimization, the left and right archways and the entire plastic sheet calender can also be raised and lowered on the ground wheel device to meet different production needs. For example, the distance between the archway and the preceding sheet extruder can be adjusted, or the relative height of the entire plastic sheet calender can be adjusted. These adjustments allow for better adaptation to production and can meet the needs of sheet material specification adjustments (such as width). Attached Figure Description

[0017] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of the plastic sheet calendering machine of the present invention.

[0019] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure.

[0020] Figure 3 for Figure 1 Rear view.

[0021] Figure 4 This is a three-dimensional structural diagram of the middle roller drive component and the middle support base in this invention.

[0022] Figure 5 This is a three-dimensional schematic diagram of the cooperation structure between the front roller drive component and the front support seat or the rear roller drive component and the rear support seat in this invention.

[0023] Figure 6 for Figure 5 Another exploded view of the structure.

[0024] Figure 7 for Figure 6 Another structural diagram from a different angle.

[0025] Figure 8 This is a schematic diagram of the structure of a plastic sheet calender, in which the box structure of the rear support frame is hidden.

[0026] Figure 9 for Figure 8 A schematic diagram of the three-dimensional structure from another angle.

[0027] Figure 10 for Figure 8 A side front view.

[0028] In the picture: 1. Front roll assembly; 10. Front calendering roll; 11. Front support seat; 12. Front roll drive assembly; 13. First motor; 14. First reducer; 15. Front connecting flange plate; 16. First flange ring; 17. First lower extension; 18. First connecting rod; 2. Intermediate roll assembly; 20. Intermediate calendering roll; 21. Intermediate support base; 22. Intermediate roll drive unit; 23. Second motor; 24. Second reducer; 28. Second connecting rod; 3. Rear roll assembly; 30. Rear calendering roll; 31. Rear support seat; 32. Rear roll drive assembly; 33. Third motor; 34. Third reducer; 35. Rear connecting flange plate; 36. Second flange ring; 37. Second lower extension; 38. Third connecting rod; 4. Archway; 41. Forward shift guide rail; 42. Rear shift guide rail; 43. Longitudinal ground rail; 44. Lifting guide pair; 46. Groove; 45. Lifting transmission device; 47. Horizontal connecting plate; 48. Vertical guide rail; 49. Slider; 5. Front seat shifting transmission device; 50. Front seat shifting drive component; 51. Front drive mounting base; 52. Front connecting base; 53. Front seat rearward movement and approach limit adjustment device; 55. First shifting adjustment block; 56. First pressing component; 57. Inclined surface; 58. First slide groove; 59. First lifting and shifting adjustment device; 6. Rear seat shifting transmission device; 60. Rear seat shifting drive component; 61. Rear drive mounting base; 62. Rear connecting base; 63. Rear seat forward movement and approach limit adjustment device; 65. Second shifting adjustment block; 66. Second pressing component; 67. Inclined surface; 68. Second slide groove; 69. Second lifting and shifting adjustment device; 7. Ground wheel assembly; 70. Ground wheel body; 71. Support frame; 72. Drive shaft; 73. Ground wheel axle; 74. Transmission wheel; 75. Drive wheel; 76. First synchronous shaft; 77. First coupling; 78. Drive component; 79. Reducer; 80. Lead screw; 81. Worm gear; 82. Second synchronous shaft; 83. Second coupling; 84. Power motor; 85. Manual drive unit; 86. First fixed seat; 87. Second fixed seat; 91. Box body; 92. Side panel. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the implementation of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Referring to the accompanying drawings, the plastic sheet calender in this embodiment includes a calendering mechanism and a debugging mechanism.

[0031] The adjustment mechanism includes a longitudinal ground rail 43 below the left and right archways 4. The lower areas in front and behind each archway 4 are respectively equipped with ground wheel devices 7. The ground wheel devices 7 are arranged on the longitudinal ground rail 43 so that the entire frame archway can be adjusted in position on the longitudinal ground rail using the ground wheel devices. This enables the adjustment of the longitudinal front and rear relative positions of the left and right archways and the entire plastic sheet calender. After adjustment, the sheet material from the sheet extruder can be lowered relatively accurately and fall between the front calender roll 10 and the middle calender roll 20.

[0032] The calendering mechanism of the plastic sheet calendering machine includes a front roller assembly 1, a middle roller assembly 2, and a rear roller assembly 3; The front roller assembly 1 includes a front calendering roller 10, a front support seat 11, and a front roller drive component 12. The front calendering roller 10 is disposed on the front support seat 11 and is supported by the front support seat 11 to rotate. The front roller drive component 12 is connected to the front support seat 11 and is connected to the front roller drive component 12 for transmission. The front roller drive component 12 is used to drive the front calendering roller 10 on the front support seat 11 to rotate. The intermediate roll device 2 includes an intermediate calendering roll 20, an intermediate support base 21, and an intermediate roll drive component 22. The intermediate calendering roll 20 is disposed on the intermediate support base 21, and the intermediate support base 21 supports the intermediate calendering roll 20 to roll and rotate. The intermediate roll drive component 22 is connected to the intermediate support base 21, and the intermediate calendering roll 20 is connected to the intermediate roll drive component 22 for transmission. The intermediate roll drive component 22 is used to drive the intermediate calendering roll 20 on the intermediate support base 21 to roll and rotate. The rear roll assembly 3 includes a rear calendering roll 30, a rear support seat 31, and a rear roll drive component 32. The rear calendering roll 30 is disposed on the rear support seat 31 and is supported by the rear support seat 31 to roll and rotate. The rear roll drive component 32 is connected to the rear support seat 31 and is connected to the rear roll drive component 32 for transmission. The rear roll drive component 32 is used to drive the rear calendering roll 30 on the rear support seat 31 to roll and rotate. The middle support seat 21 is set on the frame 4 (i.e., the frame support plate). The frame 4 is also equipped with a front shift guide rail 41 and a rear shift guide rail 42. The front support seat 11 is arranged on the front shift guide rail 41, which is used to support the front support seat 11 to move and adjust its position on the frame 4. The rear support seat 31 is arranged on the rear shift guide rail 42, which is used to support the rear support seat 31 to move and adjust its position on the frame 4. The front support seat 11 and the rear support seat 31 are respectively arranged in front of and behind the middle support seat 21. The middle calendering roll 20 is arranged between the front calendering roll 10 and the rear calendering roll 30, forming a front, middle and rear three-roll calendering structure. The archway 4 is also equipped with a front seat shifting transmission device 5 and a rear seat shifting transmission device 6. The front seat shifting transmission device 5 is connected to the front support seat 11 configured on the front shifting guide rail 41 so as to drive the front support seat 11 to move and adjust its position on the front shifting guide rail 41. The front calendering roller 10 on the front support seat 11 moves and adjusts its position along the front shifting guide rail 41 (back and forth). The rear seat shifting transmission device 6 is connected to the rear support seat 31 configured on the rear shifting guide rail 42 so as to drive the rear support seat 31 to move and adjust its position on the rear shifting guide rail 42. The rear calendering roller 30 on the rear support seat 31 moves and adjusts its position along the rear shifting guide rail 42 (back and forth).

[0033] The working principle is as follows: the material of the continuously rolled plastic sheet (such as output from a sheet extruder) is fed through the gap between the front calender roll 10 and the middle calender roll 20 for the first calendering. After the first calendering, the material is arranged around the roll surface of the middle calender roll 20, and then passes through the gap between the middle calender roll 20 and the rear calender roll 30 for the second calendering. After that, it can be output along the roll surface of the rear calender roll 30. During the calendering process, the gap between the front calender roll 10 and the middle calender roll 20 is used for the first calendering, and the gap between the middle calender roll 20 and the rear calender roll 30 is used for the second calendering. The front calender roll 10 and the rear calender roll 30 can be moved forward and backward respectively, which not only separates them from the middle calender roll 20 to facilitate the arrangement and feeding of the sheet, but also allows for relatively convenient adjustment of the gap size between them and the centrally located middle calender roll 20, thereby adjusting the calendering pressure (between the rolls) to control the thickness of the calendered sheet.

[0034] The calendering mechanism of this plastic sheet calendering machine has a front, middle and rear three-roll calendering structure on the archway 4. The structure layout is reasonable, which facilitates the feeding and arrangement of continuously rolled plastic sheets and can also be used to control the thickness of the calendered sheet, making it relatively practical.

[0035] Based on the above embodiments, the following optimizations or further explanations can be made.

[0036] For example, the forward shift guide rail 41 and the backward shift guide rail 42 are both linear guide rails, and the forward shift guide rail 41 and the backward shift guide rail 42 are respectively located at the front and rear of the middle support 21.

[0037] Further optimization involves arranging the front calender roll 10 and the rear calender roll 30 with the front roll lower than the rear roll. This three-roll calendering structure not only facilitates the vertical drop (hanging) of the extruded sheet into the gap between the front and middle calender rolls (from above into the gap), making it easier to observe its operating status, but also allows for easier connection of the calendered sheet to the subsequent forming machine due to the higher rear roll. Furthermore, the longer length of the sheet around the surface of the middle calender roll helps with initial shaping and flattening. Correspondingly, the front shift guide rail 41 is arranged horizontally longitudinally, while the rear shift guide rail 42 is arranged with varying heights. The middle support 21 can be fixedly mounted on the archway 4. Cooling water can be circulated within each calender roll to accelerate cooling and facilitate calendering and shaping, or air cooling can be used.

[0038] The design can be further optimized. The line connecting the center of the front calendering roll 10 and the center of the intermediate calendering roll 20 is parallel to the front shift guide rail 41. This means that during the movement and position adjustment of the front calendering roll 10 along the front shift guide rail 41 on the front support 11, the center of the front calendering roll 10 and the center of the intermediate calendering roll 20 always remain corresponding. Similarly, the line connecting the center of the intermediate calendering roll 20 and the center of the rear calendering roll 30 is parallel to the rear shift guide rail 42. This means that during the movement and position adjustment of the rear calendering roll 30 along the rear shift guide rail 42 on the rear support 31, the center of the rear calendering roll 30 and the center of the intermediate calendering roll 20 always remain corresponding. In this optimized structure, the relative positions of the front calendering roll 10 and the rear calendering roll 30 in cooperation with the intermediate calendering roll 20 are more uniform, resulting in more stable adjustment of the calendering pressure (between the rolls) and avoiding the influence of positional changes.

[0039] It can be further optimized. The forward shift guide rail 41 and the rear shift guide rail 42 are mounted on the upper edge of the archway 4 (i.e., the frame support plate), and the middle support base 21 is mounted on the upper edge of the archway 4. By making full use of the position of the upper edge of the archway 4 for the installation, the archway 4 provides better support for them.

[0040] For example, the front seat shifting transmission device 5 includes a front seat shifting drive component 50, which is connected and installed on the archway 4. The front seat shifting drive component 50 is connected to the front part of the front support seat 11, that is, the front seat shifting drive component acts on the front part of the front support seat 11, and the front seat shifting drive component 50 cooperates to drive the front support seat 11 to move back and forth on the archway 4 along the front shifting guide rail 41; a front seat rearward movement and approach limiting adjustment device 53 is provided between the rear part of the front support seat 11 and the archway 4 or the middle support seat 21, which is used by... The front seat backward movement and approach limit adjustment device 53 works in conjunction with the front support seat 11 to limit the stop position (i.e., the final position) when it moves backward and approaches. It can also adjust the relative front and back position of the stop position, so as to realize the limit of the stop position of the front calendering roller 10 when it moves backward and approaches with the front support seat 11, and to adjust the relative front and back position of the stop position. This is so as to cooperate with the front seat shift transmission device 5 to conveniently and stably control the gap between the front calendering roller 10 and the middle calendering roller 20 when they approach each other, thereby achieving the purpose of adjusting the calendering pressure and the thickness of the sheet.

[0041] Similarly, the rear seat shifting transmission device 6 includes a rear seat shifting drive component 60, which is connected and installed on the archway 4. The rear seat shifting drive component 60 is connected to the rear part of the rear support seat 31, that is, the rear seat shifting drive component acts on the rear part of the rear support seat 31, and the rear seat shifting drive component 60 cooperates to drive the rear support seat 31 to move back and forth on the archway 4 along the rear shifting guide rail 42; a rear seat forward movement and approach limit adjustment device 63 is provided between the front part of the rear support seat 31 and the archway 4 or the middle support seat 21, which is controlled by... The rear seat forward movement and approach limit adjustment device 63 works in conjunction with the rear support seat 31 to limit the stop position (i.e., the final position) when it moves forward and approaches. It can also adjust the relative front and back of the stop position, so as to limit the stop position when the rear calendering roller 30 moves forward and approaches the support seat 31, and adjust the relative front and back of the stop position. This is so as to cooperate with the rear seat shift transmission device 6 to conveniently and stably control the gap between the rear calendering roller 30 and the intermediate calendering roller 20 when they approach each other, and can achieve the purpose of adjusting the calendering pressure and the thickness of the sheet.

[0042] There are various configurations for the front seat shifting drive component 50 and the rear seat shifting drive component 60, which can use motors or other power sources. For example, the front seat shifting drive component 50 can be a pneumatic or hydraulic cylinder, connected to the archway 4 via a front drive mounting base 51. The rear seat shifting drive component 60 can also be a pneumatic or hydraulic cylinder, connected to the archway 4 via a rear drive mounting base 61. A front connecting base 52 is provided on the front side of the front support base 11, and the piston rod of the front seat shifting drive component 50 (such as the piston rod of a pneumatic or hydraulic cylinder) is connected to the front connecting base 52. A rear connecting base 62 is provided on the rear side of the rear support base 31, and the piston rod of the rear seat shifting drive component 60 (such as the piston rod of a pneumatic or hydraulic cylinder) is connected to the rear connecting base 62. This structure maintains the structural integrity of the front support base 11 and the rear support base 31, facilitating maintenance and assembly.

[0043] For example, the front seat rearward movement and proximity limit adjustment device 53 and the rear seat forward movement and proximity limit adjustment device 63 respectively adopt inclined block adjustment devices. The inclined block adjustment device includes a displacement adjustment block and a pressing component. The displacement adjustment block has an inclined surface, meaning it moves with the displacement adjustment block to adjust its relative position. The pressing component faces this inclined surface, and when they come together, the pressing component presses against the inclined surface of the displacement adjustment block for limiting. The displacement adjustment block can also be pre-moved to adjust its relative position, thereby adjusting the relative position of the inclined surface. The point where the pressing component presses against the inclined surface will be adjusted to regulate the relative front-to-back position of the stop point. For example, the pressing component can be a pressing block. In the structural distribution, the rear of the front support 11 and the front of the rear support 31 are respectively equipped with corresponding pressing components, and the front of the archway 4 on the front side of the rear support 31 and the front of the middle support 21 are respectively equipped with displacement adjustment blocks. Furthermore, the displacement adjustment block is connected to a lifting and shifting drive component, which drives the displacement adjustment block to move up and down to adjust its relative position. The lifting and shifting drive component can be a worm gear screw jack, etc.

[0044] Specifically, the front seat rearward movement and engagement limiting adjustment device 53 includes a first displacement adjustment block 55 and a first pressing component 56. The first displacement adjustment block 55 is disposed on the archway 4 or the middle support 21, and the first pressing component 56 is disposed at the rear of the front support 11. The first displacement adjustment block 55 is disposed behind the first pressing component 56, and the first pressing component 56 faces the inclined surface 57 of the first displacement adjustment block 55. The rear seat forward movement and engagement limiting adjustment device 63 includes a second displacement adjustment block 65 and a second pressing component 66. The second displacement adjustment block 65 is disposed on the archway 4 or the middle support 21, and the second pressing component 66 is disposed at the front of the rear support 31. The second displacement adjustment block 65 is disposed in front of the second pressing component 66, and the second displacement adjustment block 65 faces the inclined surface 67 of the second pressing component 66. The archway 4 and / or the central support 21 are provided with a first slide groove 58 and a second slide groove 68. A first displacement adjusting block 55 is disposed on the first slide groove 58, and a second displacement adjusting block 65 is disposed on the second slide groove 68. The first displacement adjusting block 55 and the second displacement adjusting block 65 are configured for lifting and shifting. The lifting and shifting can be vertical or oblique. The first slide groove 58 is orthogonal to the front displacement guide rail 41, and the second slide groove 68 is orthogonal to the rear displacement guide rail 42. The first displacement adjusting block 55 is driven by a first lifting and shifting adjusting device 59. The first lifting and shifting adjusting device 59 works in conjunction with the first displacement adjusting block 55 to adjust its relative position by lifting and shifting. The second displacement adjusting block 65 is driven by a second lifting and shifting adjusting device 69. The second lifting and shifting adjusting device 69 works in conjunction with the second displacement adjusting block 65 to adjust its relative position by lifting and shifting. The first lifting and shifting adjustment device 59 and the second lifting and shifting adjustment device 69 are respectively selected from worm gear screw jacks (as corresponding lifting and shifting drive components). The first and second shifting adjustment blocks can also be pre-moved and adjusted to adjust their relative positions, thereby adjusting the relative positions of the inclined surfaces 57 and 67. The points where the first and second pressing components press on the inclined surfaces 57 and 67 will be adjusted so as to adjust the relative front and rear positions of the stop points, thereby achieving the purpose of adjusting the calendering pressure and adjusting the sheet thickness.

[0045] The connection methods between each support base and the corresponding calendering roll and drive component are relatively mature. This invention further optimizes its structure. For example, a first bearing is provided between the front support base 11 and the front calendering roll 10 to allow the front calendering roll 10 to roll smoothly on the front support base 11. The front roll drive component 12 includes a first motor 13, a first reducer 14, and a front connecting flange plate 15. The front connecting flange plate 15 has a first flange ring 16. The transmission connection of the first motor 13 to the first reducer 14 is a mature technology (usually the first reducer 14 is directly connected to the front support base 11). In this embodiment, a front connecting flange plate 15 is added between them for a mating connection. The (power) output port of the first reducer 14 is correspondingly connected to the first flange ring 16 on the front connecting flange plate 15. Fasteners such as screws can be used to fix the first reducer 14 to the first flange ring 16 on the front connecting flange plate 15. The power transmission part can pass through the first flange ring 16 for corresponding connections (e.g., the output shaft of the first reducer 14 is connected to the front calendering roll 10). (Connected to the spindle drive), in addition, the front connecting flange plate 15 also has a first lower extension 17, which is located below the first flange ring 16, that is, the first lower extension 17 is located on the lower side of the first flange ring 16 of the front connecting flange plate 15. The first lower extension 17 is connected to the housing of the first reducer 14 by the first connecting rod 18. The first motor 13 is located outside the first connecting rod 18, which can additionally connect the first reducer 14 to the front connecting flange plate 15. In the front support seat 11 running on the front shift guide rail 41 of the archway 4, the addition of the front connecting flange plate 15 and the first connecting rod 18 cooperates in the connection between the front support seat 11 and the first reducer 14, reducing the impact of the front support seat 11 shifting and the front calendering roller 10 shaking during operation. It can also play the role of fixing the first reducer 14 and preventing it from shifting during the rolling rotation of the front calendering roller 10. The first connecting rod 18 can adopt a screw, nut or other structure for connection and installation.

[0046] In this embodiment, a second bearing is provided between the intermediate support 21 and the intermediate calendering roll 20 to facilitate the smooth rolling and rotation of the intermediate calendering roll 20 on the intermediate support 21. The intermediate roll drive component 22 includes a second motor 23 and a second reducer 24. The transmission connection of the second motor 23 to the second reducer 24 is a mature technology. The (power) output port of the second reducer 24 is connected to the input port of the intermediate support 21. Fasteners such as screws can be used to fix the second reducer 24 to the intermediate support 21. A second connecting rod 28 is also connected between the archway 4 and the housing of the second reducer 24. The second connecting rod 28 is located below the intermediate support 21, and the second motor 23 is located outside the second connecting rod 28. This reduces the impact of shaking during the operation of the intermediate calendering roll 20 and also serves to fix the second reducer 24 and prevent it from shifting during the rolling and rotation of the intermediate calendering roll 20. The second connecting rod 28 can be a screw, nut, or other structure for easy connection and fixing.

[0047] For example, a third bearing is provided between the rear support 31 and the rear calendering roll 30 to facilitate the smooth rolling and rotation of the rear calendering roll 30 on the rear support 31. The rear roll drive component 32 includes a third motor 33, a third reducer 34, and a rear connecting flange plate 35. The transmission connection of the third motor 33 to the third reducer 34 is a mature technology (usually the third reducer 34 is directly connected to the rear support 31). In this embodiment, a rear connecting flange plate 35 is added between them for mating connection. The rear connecting flange plate 35 has a second flange ring 36. The (power) output port of the third reducer 34 is correspondingly connected to the second flange ring 36 on the rear connecting flange plate 35. Fasteners such as screws can be used to fix the third reducer 34 to the second flange ring 36 on the rear connecting flange plate 35. The power transmission part can pass through the second flange ring 36 for corresponding connection (e.g., the output shaft of the third reducer 34 is connected to the spindle of the rear calendering roll 30). In addition, the rear connecting flange plate 35 also has a second lower extension 37, which is located below the second flange ring 36. That is, the second lower extension 37 is located below the second flange ring 36 of the rear connecting flange plate 35. The second lower extension 37 is connected to the housing of the third reducer 34 by the third connecting rod 38. The third motor 33 is located outside the third connecting rod 38, which can connect the third reducer 34 to the rear connecting flange plate 35. In the rear support seat 31 running on the rear shift guide rail 42 of the archway 4, the rear connecting flange plate 35 and the third connecting rod 38 are added to cooperate in the connection between the rear support seat 31 and the third reducer 34, which reduces the impact of the rear support seat 31 shifting and the shaking caused by the rear calendering roller 30 during operation. It can also play a role in fixing the third reducer 34 and preventing it from shifting during the rolling and rotating process of the rear calendering roller 30. The third connecting rod 38 can adopt a screw, nut or other structure for connection and installation.

[0048] Furthermore, the debugging mechanism will be explained in more detail.

[0049] The debugging mechanism of the plastic sheet calender in this embodiment includes a longitudinal ground rail 43 under the left and right archways 4 (i.e., the left archway 4 and the right archway 4), the calendering mechanism is set on the archways 4, and the lower area in front of and behind each archway 4 is respectively provided with a ground wheel device 7.

[0050] The ground wheel device 7 includes a support frame 71 and a ground wheel body 70. The ground wheel body 70 is installed and connected to the support frame 71 and is arranged on the longitudinal ground rail 43. The ground wheel body 70 moves longitudinally on the longitudinal ground rail 43. The ground wheel body 70 of the ground wheel device 7 rolls on the longitudinal ground rail 43, driving the archway 4 and the entire plastic sheet calender to move longitudinally and adjust their relative positions.

[0051] In addition, a lifting guide pair 44 is provided between the support frame 71 and the archway 4, that is, the archway 4 can be lifted and lowered relative to the support frame 71 of the ground wheel device 7. The support frame 71 is also provided with a lifting transmission device 45, which is connected to the archway 4. The lifting transmission device 45 drives the archway 4 to be lifted and lowered on the support frame 71. The front and rear of each archway 4 (i.e., the left archway 4 and the right archway 4, i.e., the machine frame support plate) are respectively mounted on the corresponding support frame 71 through the lifting transmission device 45, forming a four-corner support. The ground wheel device 7 distributed at the four corners supports the left and right archways 4 and the entire plastic sheet calender. In parallel, the ground wheel device 7 can be driven to move forward and backward longitudinally on the longitudinal ground rail 43 to adjust the relative position. Furthermore, the lifting transmission device 45 on the support frame 71 of the ground wheel device 7 will also cooperate to realize the lifting and lowering adjustment of the left and right archways 4 and the entire plastic sheet calender on the ground wheel device 7.

[0052] The adjustment mechanism of this plastic sheet calender is equipped with a corresponding ground wheel device 7, longitudinal ground rail 43, and corresponding lifting transmission device 45. It can realize the longitudinal front-back relative position adjustment of the left and right arches 4 and the entire plastic sheet calender, so as to move backward to make room for the sheet extruder adjustment, manual cleaning and other operations. After the operation is completed, it can be moved forward back to the bottom of the sheet extruder discharge end to receive the extruded sheet between its calendering rollers. It can also realize the lifting and adjustment of the left and right arches 4 and the entire plastic sheet calender on the ground wheel device 7, so as to meet different production needs. For example, the distance between it and the sheet extruder of the previous process (such as the vertical distance) can be adjusted. For example, the relative height of the entire plastic sheet calender can be adjusted. Through adjustment, it can be better adapted to production and meet the sheet specification adjustment needs.

[0053] Based on the above embodiments, the following optimizations or further explanations can be made.

[0054] Each archway 4 is equipped with a corresponding ground wheel device 7 at its front and rear positions. For example, each archway 4 has a recessed area on its lower side at the front and rear. The lifting transmission device 45 and the ground wheel device 7 are located in the recessed area. The lifting transmission device 45 and the ground wheel device 7 can be hidden in the recessed area. The ground wheel device 7 provides high support for the archway 4 and hardly affects the original front and rear length of the archway 4. For example, the ground wheel device 7 can be directly installed in the lower area.

[0055] A transverse connecting plate 47 connects the left and right archways 4, fixing them together and making the frame structure of the plastic sheet calender more stable. The longitudinal ground rails 43 are arranged side-by-side, running longitudinally forward and backward. These rails, supported by corresponding ground wheel devices 7, support the left and right archways 4 and the entire plastic sheet calender. The ground wheel devices 7 are arranged in two rows, with the left and right wheels side-by-side, forming a four-corner support structure. Located at the four corners of the plastic sheet calender, these ground wheel devices offer more stable operation and a more rational support structure.

[0056] The ground wheel device 7, which is located in front and / or behind, also includes a drive shaft 72. That is, the ground wheel device 7 in the front row and / or rear row has a drive shaft 72. The drive shaft 72 is mounted on the support frame 71 and is connected to the ground wheel body 70. When the drive shaft 72 rotates on the support frame 71 (a bearing can be installed between the support frame 71 and the drive shaft 72), the drive shaft 72 drives the ground wheel body 70 to rotate, so that the ground wheel body 70 actively rolls on the longitudinal ground rail 43, thereby enabling the archway 4 and the entire plastic sheet calender to be driven to move longitudinally on the longitudinal ground rail 43 to adjust their relative front and rear positions.

[0057] For example, the ground wheel body 70 is connected to the ground wheel axle 73, which is mounted on the support frame 71. The ground wheel axle 73 supports the ground wheel body 70 to rotate and roll on the support frame 71. For instance, the ground wheel axle 73 can be fixed to the support frame 71, and a corresponding bearing can be configured between the ground wheel axle 73 and the ground wheel body 70. Of course, other structural methods can also be used. The ground wheel body 70 is connected to a transmission wheel 74, which is coaxial with the ground wheel body 70. The transmission wheel 74 can be fixed to the side (such as the inner side) of the ground wheel body 70 by fasteners. The transmission wheel 74 and the ground wheel body 70 will rotate together. The drive shaft 72 is equipped with a drive wheel 75, which is connected to the transmission wheel 74. For example, the drive wheel 75 and the transmission wheel 74 adopt a gear meshing transmission structure. The drive shaft 72 drives the drive wheel 75 to rotate, and the drive wheel 75 drives the transmission wheel 74 to rotate, thereby driving the ground wheel body 70 to rotate.

[0058] The support frame 71 includes a housing 91. The support frame 71 adopts a housing 91 structure for more stable support and can house the corresponding structure inside it, making it less susceptible to influence. The housing 91 is mainly formed by connecting and combining side plates 92 (such as side plates 92 in the front, back, left, right and top directions). The ground wheel axle 73 is set on the housing 91, the drive shaft 72 is set on the housing 91, the ground wheel body 70 is located inside the housing 91, the transmission wheel 74 is set inside the housing 91, and the drive wheel 75 is set inside the housing 91.

[0059] Among them, the drive shafts 72 of the left and right side-by-side ground wheel devices 7 are arranged horizontally (i.e., arranged in a left-right direction). The drive shafts 72 of the left and right side-by-side ground wheel devices 7 are connected to each other by a first synchronous shaft 76. The first synchronous shaft 76 drives the drive shafts 72 of the left and right ground wheel devices 7 to rotate synchronously. The synchronicity between the left and right sides is well guaranteed, which makes the longitudinal movement of the archway 4 and the entire plastic sheet calender more stable in adjusting the relative position before and after. The first synchronous shaft 76 is connected to the left and right drive shafts 72 via first couplings 77, a relatively mature connection method. In this invention, both ends of the first synchronous shaft 76 are connected to the (left and right) drive shafts 72 via corresponding first couplings 77. The left and right drive shafts 72 can not only rotate in conjunction with the first synchronous shaft 76 and the first couplings 77, but also are relatively easy to disassemble and assemble. Furthermore, the first couplings 77 can be removed to achieve independent fine-tuning of the left or right drive shaft 72 before reconnecting the first couplings 77. The left or right drive shaft 72 is connected to a drive component 78, which drives the drive shaft 72 to rotate. The drive component 78 includes a reducer 79 (such as a gearbox), making it relatively easy to rotate the drive shaft 72. In addition, the reducer 79 is equipped with a drive motor or a manual drive operation component.

[0060] The lifting guide pair 44 includes a vertical guide rail 48 and a slider 49 that are connected in a mating manner. The vertical guide rail 48 is set on the archway 4, and the slider 49 is set on the support frame 71 (such as the side plate 92 of the housing 91). The lifting transmission device 45 includes a worm gear screw jack. The worm gear screw jack is a mature technology. The screw 80 of the worm gear screw jack is set vertically (i.e., up-down direction), and the axis of the worm 81 of the worm gear screw jack is set horizontally (i.e., left-right direction). The worms 81 of the left and right worm gear screw jacks are connected to each other by a second synchronous rotating shaft 82. The second synchronous rotating shaft 82 is connected to the left and right worms 81 respectively through a second coupling 83, which can realize the synchronous linkage operation of the left and right worm gear screw jacks. The left and right lifting is relatively synchronized, and the disassembly and assembly are relatively convenient. Moreover, the second coupling 83 can be used to... After disassembly, the worm 81 on the left or right side can be independently fine-tuned and rotated before the second coupling 83 is reconnected, which can adjust the left and right lifting balance. In the worm gear screw jacks located on the left and right, the worm 81 of one worm gear screw jack is connected to the power motor 84, while the worm 81 of the other worm gear screw jack has a manual drive part 85 (such as a wrench mating part, handwheel, etc.). The power motor 84 is used to drive the worm 81, the second synchronous rotating shaft 82, and the other worm 81 to rotate together. The manual drive part 85 is used to drive the worm 81 on one side of the left or right side to rotate independently when the second coupling 83 is removed.

[0061] In addition, the top of the support frame 71 is provided with a first fixed seat 86 (such as a fixed plate), and the screw 80 of the worm gear screw jack is connected to the first fixed seat 86. The first fixed seat 86 is used to fix the screw 80. The archway 4 is provided with a second fixed seat 87 (such as a fixed plate). The second fixed seat 87 is located above the first fixed seat 86. The worm gear screw jack is configured between the first fixed seat 86 and the second fixed seat 87. The body (or shell) of the worm gear screw jack is connected to the second fixed seat 87. This fixed installation structure is relatively stable. Alternatively, a groove 46 can be provided on the archway 4, such as an upward-facing groove 46 provided on the basis of the recess for the screw 80 to move relatively telescopically. The second fixed seat 87 has a channel for the screw 80 to pass through.

Claims

1. A plastic sheet calender, comprising a calendering mechanism and an adjustment mechanism, wherein the calendering mechanism comprises a front roller assembly (1), a middle roller assembly (2), and a rear roller assembly (3), and the adjustment mechanism comprises a longitudinal ground rail (43) below left and right arches (4), characterized in that: Each archway (4) has a ground wheel device (7) installed in the lower area in front of and behind it. The ground wheel device (7) is arranged on the longitudinal ground rail (43). The front roll assembly (1) includes a front calendering roll (10), a front support seat (11), and a front roll drive unit (12). The front calendering roll (10) is mounted on the front support (11), and the front roll drive unit (12) is connected to the front support (11). The front calendering roll (10) and the front roll drive unit (12) are connected in a transmission manner. The intermediate roll assembly (2) includes an intermediate calendering roll (20), an intermediate support seat (21), and an intermediate roll drive component (22). The intermediate calendering roll (20) is mounted on the intermediate support base (21), and the intermediate roll drive component (22) is connected to the intermediate support base (21). The intermediate calendering roll (20) and the intermediate roll drive component (22) are connected in a transmission manner. The rear roll assembly (3) includes a rear calendering roll (30), a rear support (31), and a rear roll drive assembly (32). The rear calendering roll (30) is mounted on the rear support (31), and the rear roll drive unit (32) is connected to the rear support (31). The rear calendering roll (30) is connected to the rear roll drive unit (32) in a transmission connection. The central support base (21) is set on the archway (4), and the archway (4) is also equipped with a forward shift guide rail (41) and a rear shift guide rail (42). The front support (11) is mounted on the front shift guide (41), and the rear support (31) is mounted on the rear shift guide (42). The front support (11) and the rear support (31) are respectively located at the front and rear of the middle support (21), and the middle calendering roll (20) is arranged between the front calendering roll (10) and the rear calendering roll (30). The archway (4) is also equipped with a front seat shifting transmission device (5) and a rear seat shifting transmission device (6). The front seat shifting transmission device (5) is connected to the front support seat (11) in a transmission connection. The rear seat shift transmission device (6) is connected to the rear support seat (31) in a transmission connection.

2. The plastic sheet calender as described in claim 1, characterized in that: The ground wheel device (7) includes a support frame (71) and a ground wheel body (70). The ground wheel body (70) is mounted on the support frame (71) and is arranged on the longitudinal ground rail (43). A lifting guide pair (44) is provided between the support frame (71) and the archway (4). The support frame (71) is also equipped with a lifting transmission device (45), which is connected to the archway (4) for transmission. Each archway (4) is mounted on a corresponding support frame (71) via a lifting transmission device (45) at the front and back.

3. The plastic sheet calender as described in claim 2, characterized in that: A horizontal connecting plate (47) is also connected between the left and right archways (4). The longitudinal rails (43) are arranged side by side, and the longitudinal rails (43) are arranged longitudinally front to back. The ground wheel device (7) is arranged in two rows at the front and rear, and the left and right ground wheel devices (7) are arranged side by side; The ground wheel assembly (7) that is located in front and / or behind also includes a drive shaft (72). The drive shaft (72) is mounted on the support frame (71), and the drive shaft (72) is connected to the ground wheel body (70) for transmission. The ground wheel body (70) is connected to the ground wheel axle (73), the ground wheel axle (73) is mounted on the support frame (71), and the ground wheel body (70) is connected to a transmission wheel (74). The transmission wheel (74) is coaxially arranged with the ground wheel body (70). A drive wheel (75) is provided on the drive shaft (72), and the drive wheel (75) is connected to the transmission wheel (74) for transmission.

4. The plastic sheet calender as described in claim 3, characterized in that: The support frame (71) includes a housing (91). The ground wheel axle (73) is mounted on the housing (91), and the drive shaft (72) is mounted on the housing (91). The ground wheel body (70) is located inside the housing (91), the transmission wheel (74) is located inside the housing (91), and the drive wheel (75) is located inside the housing (91); The drive shafts (72) of the side-by-side ground wheel devices (7) are arranged horizontally, and the drive shafts (72) of the side-by-side ground wheel devices (7) are connected to each other by a first synchronous shaft (76). The first synchronous rotating shaft (76) is connected to the left and right drive rotating shafts (72) respectively through the first coupling (77); The drive shaft (72) on the left or right side is connected to a drive component (78), which includes a reducer (79). The reducer (79) is equipped with a drive motor or a manual drive mechanism; The lifting guide pair (44) includes a vertical guide rail (48) and a slider (49) that are connected in a mating manner. The vertical guide rail (48) is set on the archway (4), and the slider (49) is set on the support frame (71). The lifting transmission device (45) includes a worm gear screw jack, wherein the screw (80) of the worm gear screw jack is vertically arranged; The axis of the worm (81) in the worm gear screw jack is set laterally. The worms (81) of the left and right worm gear screw jacks are connected to each other by a second synchronous shaft (82). The second synchronous shaft (82) is connected to the left and right worm gears (81) respectively via the second coupling (83); In one of the worm gear screw jacks located on the left and right, the worm (81) of the worm gear screw jack is connected to a power motor (84). One of the other worm gears (81) and screws (80) of the elevator has a manual drive part (85). The top of the support frame (71) is provided with a first fixed seat (86). The screw (80) of the worm gear screw jack is connected to the first fixed seat (86). The archway (4) is equipped with a second fixed seat (87). The second fixed seat (87) is located above the first fixed seat (86), and the body of the worm gear screw jack is connected to the second fixed seat (87). The worm gear screw jack is configured between the first fixed seat (86) and the second fixed seat (87).

5. The plastic sheet calender as described in claim 1, characterized in that: The front shift guide (41) and the rear shift guide (42) are both linear guides. The front shift guide (41) and the rear shift guide (42) are respectively located at the front and rear of the middle support (21); the front calendering roll (10) and the rear calendering roll (30) are arranged opposite each other with the front lower and the rear higher; the front shift guide (41) is arranged horizontally longitudinally at the front and rear, and the rear shift guide (42) is arranged with the front and rear higher and lower inclined. The central support base (21) is fixedly installed on the archway (4); The line connecting the center of the front calendering roll (10) and the center of the middle calendering roll (20) is parallel to the front shift guide rail (41). The line connecting the center of the intermediate calendering roll (20) and the center of the rear calendering roll (30) is set parallel to the rear shift guide rail (42); The forward shift guide rail (41) and the rear shift guide rail (42) are mounted on the upper edge of the archway (4), and the middle support base (21) is mounted on the upper edge of the archway (4).

6. The plastic sheet calender as described in claim 1, characterized in that: The front seat shifting transmission device (5) includes a front seat shifting drive component (50), which is connected and installed on the archway (4). The front seat shift drive component (50) is connected to the front part of the front support (11). A front seat rearward movement and approach limit adjustment device (53) is provided between the rear of the front support seat (11) and the archway (4) or the middle support seat (21). The rear seat shifting transmission device (6) includes a rear seat shifting drive component (60), which is connected and installed on the archway (4). The rear seat shift drive component (60) is connected to the rear of the rear support (31). A rear seat forward movement and limiting adjustment device (63) is provided between the front part of the rear support seat (31) and the archway (4) or the middle support seat (21).

7. The plastic sheet calender as described in claim 6, characterized in that: The front seat rearward movement and proximity limit adjustment device (53) and the rear seat forward movement and proximity limit adjustment device (63) respectively adopt inclined block adjustment devices. The inclined block adjustment device includes a displacement adjustment block with an inclined surface and a pressing component facing the inclined surface; The pressing component adopts a pressing block, and the rear part of the front support (11) and the front part of the rear support (31) are respectively provided with corresponding pressing components. The archway (4) on the front side of the rear support (31) and the front side of the middle support (21) are respectively provided with displacement adjustment blocks, which are connected to the lifting and shifting drive components.

8. The plastic sheet calender as described in claim 6, characterized in that: The front seat rearward movement and proximity limiting adjustment device (53) includes a first displacement adjustment block (55) and a first pressing component (56). The first displacement adjustment block (55) is disposed on the archway (4) or the central support base (21). The first pressing component (56) is located at the rear of the front support (11). The first shift adjustment block (55) is positioned behind the first pressing component (56), with the first pressing component (56) facing the inclined surface of the first shift adjustment block (55). The rear seat forward movement and proximity limiting adjustment device (63) includes a second displacement adjustment block (65) and a second pressing component (66). The second displacement adjustment block (65) is disposed on the archway (4) or the central support base (21). The second pressing component (66) is located at the front of the rear support (31). The second shift adjustment block (65) is positioned in front of the second pressing component (66), with the second shift adjustment block (65) facing the inclined surface of the second pressing component (66).

9. The plastic sheet calender as described in claim 8, characterized in that: The archway (4) and / or the central support base (21) are provided with a first sliding groove (58) and a second sliding groove (68). The first shift adjustment block (55) is disposed on the first slide groove (58). The second shift adjustment block (65) is disposed on the second slide (68). The first displacement adjustment block (55) has a lifting and shifting adjustment setting. The second displacement adjustment block (65) is configured for lifting and lowering displacement adjustment. The first slide (58) is orthogonally arranged to the forward shift guide rail (41). The second slide (68) is orthogonally arranged to the rear shift guide rail (42). The first shift adjustment block (55) is connected to the first lifting and shift adjustment device (59) via a transmission connection. The second shift adjustment block (65) is connected to the second lifting shift adjustment device (69) in a transmission connection; The first lifting and shifting adjustment device (59) and the second lifting and shifting adjustment device (69) are respectively selected as worm gear screw jacks.

10. The plastic sheet calender as described in claim 1, characterized in that: A first bearing is provided between the front support seat (11) and the front calendering roll (10). The front roller drive component (12) includes a first motor (13), a first reducer (14) and a front connecting flange plate (15). The first motor (13) is driven and mounted on the first reducer (14), and the front connecting flange plate (15) has a first flange ring (16). The output port of the first reducer (14) is connected to the first flange ring (16). The front connecting flange plate (15) is connected to the front support base (11). The front connecting flange plate (15) also has a first lower extension (17), which is located below the first flange ring (16). The first lower extension (17) is connected to the housing of the first reducer (14) by a first connecting rod (18), and the first motor (13) is located outside the first connecting rod (18). A second bearing is provided between the intermediate support (21) and the intermediate calendering roll (20). The intermediate roller drive component (22) includes a second motor (23) and a second reducer (24), with the second motor (23) being driven and mounted on the second reducer (24). The output port of the second reducer (24) is connected to the input port of the middle support (21). A second connecting rod (28) is also connected between the housing of the archway (4) and the second reducer (24). The second connecting rod (28) is located below the middle support (21), and the second motor (23) is located outside the second connecting rod (28). A third bearing is provided between the rear support (31) and the rear calendering roll (30). The rear roller drive component (32) includes a third motor (33), a third reducer (34) and a rear connecting flange plate (35). The third motor (33) is driven and mounted on the third reducer (34), and the rear connecting flange plate (35) has a second flange ring (36). The output port of the third reducer (34) is connected to the second flange ring (36). The rear connecting flange plate (35) is connected to the rear support base (31). The rear connecting flange plate (35) also has a second lower extension (37), which is located below the second flange ring (36). The second lower extension (37) is connected to the housing of the third reducer (34) by a third connecting rod (38), and the third motor (33) is located outside the third connecting rod (38).

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