A calender for plastic processing

Abstract

The application relates to a plastic processing calender, which comprises a supporting table, an upper calender roller and a lower calender roller arranged in an up-down mode and rotatingly arranged on the supporting table, a guide mechanism, a base arranged on one side of the supporting table, a fixed guide frame and an adjusting guide frame oppositely arranged on the base, the adjusting guide frame comprising a sliding table arranged on the base, a lifting table arranged on the sliding table, guide rollers arranged in an up-down mode and rotatingly arranged above the lifting table, a height adjusting unit arranged above the lifting table, and a power unit arranged on the base. The application can change the relative position, the relative height and the interval of the guide mechanism, so as to adapt to the guiding requirements of plastic raw materials with different thicknesses and materials, and improve the universality and adaptability of the equipment.

Description

Technical Field

[0001] This application relates to the field of plastic processing technology, and in particular to a calender for plastic processing. Background Technology

[0002] In the plastics processing industry, calenders are a key piece of equipment widely used in the production of plastic films, sheets, and other products. Calenders use calendering rollers arranged vertically to extrude and stretch plastic raw materials, thereby obtaining plastic products of the desired thickness and width.

[0003] However, in existing calendering machine operations, the guiding mechanism typically uses one or more fixed guide rollers to guide the calendered plastic. Since the position, height, and spacing of these guide rollers are preset and difficult to adjust, it's inconvenient to flexibly adjust them according to the different calendering requirements of various plastics. In actual production, different plastic raw materials, different calendering process parameters, and different product requirements may all necessitate precise control of the position, height, and spacing of the guide rollers to ensure the quality and performance of the plastic products.

[0004] Specifically, during the calendering process, if the spacing between the guide rollers is too large, the plastic may become loose or wrinkled during guidance, affecting the flatness and thickness uniformity of the product. Conversely, if the spacing between the guide rollers is too small, it may increase the friction between the plastic and the guide rollers, leading to damage or scratches on the plastic surface. Furthermore, the position and height of the guide rollers also affect the tension of the plastic and the guiding path, thus impacting the overall product quality and production efficiency.

[0005] To address the aforementioned problems, a calendering machine for plastic processing is now designed. Utility Model Content

[0006] This application provides a calender for plastic processing to solve the problem that in the operation of calenders in the related art, the guiding mechanism usually uses one or more fixed guide rollers for guidance. Since the position, height and spacing of the guide rollers are preset, it is inconvenient to adjust them, and therefore it is not convenient to make flexible adjustments according to the different calendering requirements of plastics.

[0007] In a first aspect, a calendering machine for plastic processing is provided, comprising:

[0008] A support platform on which an upper calendering roller and a lower calendering roller are rotatably mounted. A driving component is provided on the support platform for driving the lower calendering roller to rotate. A lifting mechanism is provided on the support platform and is connected to the upper calendering roller for driving the upper calendering roller to rise and fall.

[0009] A guiding mechanism includes a base disposed on one side of a support platform, on which a fixed guide frame and an adjustable guide frame are disposed opposite each other;

[0010] The adjustment guide frame includes a slide table mounted on a base, a lifting platform mounted on the slide table, guide rollers arranged vertically and horizontally rotatably mounted above the lifting platform, and a height adjustment unit mounted above the lifting platform. The height adjustment unit is connected to the guide rollers above and is used to adjust the distance between the upper and lower guide rollers.

[0011] The base is also equipped with a power unit, which is connected to the slide table and is used to drive the slide table to move along the length of the base.

[0012] In some embodiments, two first support columns are arranged opposite each other on the support platform, and the lower calendering roller is rotatably disposed between the two first support columns;

[0013] The first support column has a sliding hole, and a bearing seat is slidably disposed inside the sliding hole. The upper calendering roller is rotatably disposed between the two bearing seats.

[0014] In some embodiments, the lifting mechanism includes an electric push rod disposed on a first support column, the bottom end of the piston rod of the electric push rod being connected to the bearing seat.

[0015] In some embodiments, the driving component includes a drive motor, a reducer, and a housing arranged sequentially on a support platform. The number of lower calendering rollers is two, with one end of each lower calendering roller extending into the interior of the housing. A pulley is provided on one end of each lower calendering roller, and the two pulleys are driven by a belt.

[0016] The output shaft of the drive motor is connected to the input shaft of the reducer, and the output shaft of the reducer is connected to one end of the extension of any of the lower calender rolls.

[0017] In some embodiments, the fixed guide frame is located between the lower calendering roll and the adjusting guide frame;

[0018] The fixed guide frame includes a second support column that is disposed opposite to the base, and two side plates that are disposed opposite to each other on the second support column. A guide roller is rotatably disposed between the two side plates.

[0019] In some embodiments, the slide table includes a slide rail disposed opposite to the base, a plurality of sliders slidably disposed on the slide rail, and a support plate disposed on the top of the plurality of sliders.

[0020] In some embodiments, the lifting platform includes a fixed cylinder disposed opposite to a support plate, the top of the fixed cylinder abutting against a mounting plate, and an electric push rod II disposed inside the fixed cylinder, the top end of the piston rod of the electric push rod II being connected to the mounting plate.

[0021] The mounting plate has two bearing seats 2 arranged opposite each other. The guide roller located below is rotatably arranged between the two bearing seats 2. The mounting plate has a sliding hole 2. A bearing seat 3 is slidably arranged inside the sliding hole 2. The guide roller located above is rotatably arranged between the two bearing seats 3.

[0022] In some embodiments, the height adjustment unit includes an electric push rod three disposed above the mounting plate, the piston rod of the electric push rod being connected to a bearing seat three and driving the bearing seat three to rise and fall.

[0023] In some embodiments, the power unit includes a second drive motor and a second reducer mounted on a base. The base has a cavity inside and one end is open. The base also has a moving hole. The output shaft of the second drive motor is connected to the input shaft of the second reducer. The output shaft of the second reducer passes through the moving hole and extends inward.

[0024] A rack is provided on the inner side of the base, and a gear is provided on the input shaft of the reducer, the gear meshing with the rack.

[0025] This application provides a calendering machine for plastic processing. The distance between the upper and lower guide rollers in the guide frame is adjusted by a height adjustment unit, the relative height between the guide rollers and the fixed guide frame is adjusted by a lifting platform, and the distance between the guide rollers and the fixed guide frame is adjusted by a power unit. This allows for changes in the relative position, relative height, and distance of the guiding mechanism, thus adapting to the guiding needs of plastic raw materials of different thicknesses and materials, improving the versatility and adaptability of the equipment. It helps reduce defects caused by improper gaps or poor guidance, such as uneven thickness and surface roughness, thereby improving the quality of calendered products. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A three-dimensional structural illustration provided for an embodiment of this application. Figure 1 ;

[0028] Figure 2 A three-dimensional structural illustration provided for an embodiment of this application. Figure 2 ;

[0029] Figure 3 A three-dimensional schematic diagram of the adjustment guide frame provided in the embodiments of this application;

[0030] Figure 4 Top sectional view provided for an embodiment of this application;

[0031] Figure 5 This is a front sectional view of the adjustment guide frame provided in an embodiment of this application.

[0032] In the diagram: 1. Support platform; 11. First support column; 12. Bearing seat; 2. Upper calendering roller; 3. Lower calendering roller; 4. Lifting mechanism; 5. Guiding mechanism; 51. Base; 52. Fixed guide frame; 521. Second support column; 522. Side plate; 523. Second guide roller; 53. Adjusting guide frame; 531. Slide table; 5311. Slide rail; 5312. Slider; 5313. Support plate; 532. Lifting platform; 5321. Fixed cylinder; 5322. Mounting plate; 5323. Second electric push rod; 533. Height adjustment unit; 534. Guide roller; 6. Power unit; 61. Second drive motor; 62. Second reducer; 63. Rack; 64. Gear; 7. Drive component; 71. Housing; 72. Pulley. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] This application provides a calender for plastic processing, which solves the problem in the related art where the guiding mechanism of the calender is usually a single or multiple fixed guide rollers. Since the position, height and spacing of the guide rollers are preset, they are inconvenient to adjust, making it difficult to flexibly adjust according to the different calendering requirements of plastics.

[0035] Please see Figures 1-3A calender for plastic processing includes: a support platform 1 on which an upper calendering roller 2 and a lower calendering roller 3 are rotatably arranged vertically; a driving component 7 is provided on the support platform 1 for driving the lower calendering roller 3 to rotate; a lifting mechanism 4 is provided on the support platform 1, the lifting mechanism 4 being connected to the upper calendering roller 2 for driving the upper calendering roller 2 to rise and fall; and a guiding mechanism 5, which includes a base 51 disposed on one side of the support platform 1, on which a fixed guide frame 52 and an adjusting guide frame 53 are disposed opposite each other; the adjusting guide frame 53 includes a... A slide table 531 is placed on a base 51. A lifting platform 532 is provided on the slide table 531. A guide roller 534 arranged vertically is rotatably arranged above the lifting platform 532. A height adjustment unit 533 is provided above the lifting platform 532. The height adjustment unit 533 is connected to the upper guide roller 534 and is used to adjust the distance between the upper and lower guide rollers 534. A power unit 6 is also provided on the base 51. The power unit 6 is connected to the slide table 531 and is used to drive the slide table 531 to move along the length of the base 51.

[0036] The driving component 7 drives the lower calendering roller 3 to rotate. Through the friction between the upper and lower calendering rollers, the upper calendering roller 2 is driven to rotate synchronously. The plastic raw material is fed between the upper and lower calendering rollers and is calendered to the required thickness and width under the squeezing and stretching action of the rotating calendering rollers.

[0037] When it is necessary to adjust the gap between the upper and lower calendering rollers to accommodate plastic raw materials of different thicknesses or materials, the lifting mechanism 4 drives the upper calendering roller 2 to move up and down, thereby changing the gap between the calendering rollers.

[0038] The calendered plastic is first initially guided by the fixed guide frame 52, and then enters the adjusting guide frame 53, where it is guided by two guide rollers 534 arranged vertically.

[0039] The height adjustment unit 533 is connected to the upper guide roller 534. By adjusting the height adjustment unit 533, the distance between the upper and lower guide rollers 534 can be changed, thereby adapting to the guiding needs of plastics with different thicknesses or properties.

[0040] The lifting platform 532 can adjust the relative height between the guide roller 534 and the fixed guide frame 52. The power unit 6 is connected to the slide 531 and drives the slide 531 to move along the length of the base 51, thereby adjusting the position of the guide frame 53 to better guide plastic products, so as to adapt to the tension requirements of different plastic calendering and meet the guidance requirements of products of different lengths or widths.

[0041] The distance between the upper and lower guide rollers 534 in the guide frame 53 is adjusted by the height adjustment unit 533, the relative height between the guide rollers 534 and the fixed guide frame 52 is adjusted by the lifting platform 532, and the distance between the guide rollers 534 and the fixed guide frame 52 is adjusted by the power unit 6. This allows for changes in the relative position, relative height, and distance of the guiding mechanism, thus adapting to the guiding needs of plastic raw materials of different thicknesses and materials, improving the versatility and adaptability of the equipment. It also helps reduce defects caused by improper gaps or poor guidance, such as uneven thickness and surface roughness, thereby improving the quality of calendered products.

[0042] The slide table 531 is moved by the power unit 6, so that the position of the adjustable guide frame 53 can be flexibly adjusted according to production needs, making it convenient for operators to quickly set and adjust according to the guidance requirements of different products.

[0043] like Figure 1 and Figure 2 As shown, specifically, in this embodiment, two first support columns 11 are arranged opposite to each other on the support platform 1, the lower calendering roller 3 is rotatably arranged between the two first support columns 11, the first support column 11 is provided with a sliding hole, the bearing seat 12 is slidably arranged inside the sliding hole, and the upper calendering roller 2 is rotatably arranged between the two bearing seats 12.

[0044] Furthermore, the lifting mechanism 4 includes an electric push rod mounted on the first support column 11, and the bottom end of the piston rod of the electric push rod is connected to the bearing seat 12.

[0045] On the support platform 1, two first support columns 11 are arranged opposite each other, and the lower calendering roller 3 is rotatably arranged between the two first support columns 11 to ensure that it can rotate stably and perform calendering operation.

[0046] Each first support column 11 has a sliding hole, and a bearing seat 12 is slidably arranged inside the sliding hole. The upper calendering roller 2 is rotatably arranged between the two bearing seats 12, so that the upper calendering roller 2 can move vertically on the first support column 11, thereby adjusting the gap between it and the lower calendering roller 3.

[0047] The bottom end of the piston rod of the electric push rod is connected to the bearing seat 12. When the electric push rod is working, the extension and retraction of its piston rod will drive the bearing seat 12 to slide up and down in the sliding hole, thereby realizing the lifting and lowering of the upper calendering roller 2.

[0048] like Figure 4As shown, the driving component 7 further includes a drive motor, a reducer, and a housing 71 arranged sequentially on the support platform 1. There are two lower calendering rollers 3, one end of each of the two lower calendering rollers 3 extends into the housing 71. A pulley 72 is provided on the extended end of each lower calendering roller 3, and the two pulleys 72 are driven by a belt. The output shaft of the drive motor is connected to the input shaft of the reducer, and the output shaft of the reducer is connected to the extended end of any one of the lower calendering rollers 3.

[0049] The output shaft of the drive motor is connected to the input shaft of the reducer, transmitting the motor's power to the reducer. The output shaft of the reducer is connected to one end of any lower calender roll 3 that extends into the housing, transmitting the reduced power to that lower calender roll 3.

[0050] Since the two lower calendering rollers 3 are driven by a belt and pulley, when the drive motor starts, the two lower calendering rollers 3 will rotate synchronously in the same direction to perform calendering operations.

[0051] The transmission method using belts and pulleys ensures the synchronous rotation of the two lower calendering rollers 3, which helps maintain the stability and uniformity of the plastic during the calendering process and improves the calendering quality.

[0052] like Figure 2 As shown, in one embodiment, the fixed guide frame 52 is located between the lower calendering roller 3 and the adjusting guide frame 53; the fixed guide frame 52 includes a second support column 521 disposed opposite to the base 51, and two side plates 522 disposed opposite to each other on the second support column 521, with a guide roller 523 rotatably disposed between the two side plates 522.

[0053] The fixed guide frame 52 is located between the lower calendering roller 3 and the adjusting guide frame 53 to ensure that the calendered plastic products can smoothly transition from the calendering roller to the guiding mechanism.

[0054] The second support column 521 has two side plates 522 arranged opposite to each other, forming a certain space between the side plates for installing and rotating the guide roller 523.

[0055] The second guide roller 523 is rotatably positioned between the two side plates 522. When the calendered plastic product passes by, the second guide roller 523 provides initial guidance and support to the plastic product through its rotation, ensuring that the plastic product can continue to move forward along the predetermined path.

[0056] The rotation of guide roller 2523 can reduce friction and resistance of plastic products during the guiding process, which helps to maintain the flatness and stability of plastic products.

[0057] like Figure 4 and Figure 5As shown, in one embodiment, the slide table 531 includes a slide rail 5311 disposed opposite to the base 51, a plurality of sliders 5312 are slidably disposed on the slide rail 5311, and a support plate 5313 is disposed between the tops of the plurality of sliders 5312.

[0058] The slide rail 5311 provides guidance and support for the movement of the slide table 531, and the cooperation between the slider 5312 and the slide rail 5311 ensures that the slide table 531 can move smoothly and steadily.

[0059] A support plate 5313 is provided on the top of the multiple sliders 5312. The support plate 5313 serves as a load-bearing component of the slide table 531 and is used to install and fix other components such as the lifting table 532.

[0060] like Figure 3 As shown, in one embodiment, the lifting platform 532 includes a fixed cylinder 5321 disposed opposite to the support plate 5313. The top of the fixed cylinder 5321 abuts against the mounting plate 5322. An electric push rod 5323 is disposed inside the fixed cylinder 5321. The piston rod of the electric push rod 5323 is connected to the mounting plate 5322. The mounting plate 5322 is provided with two bearing seats 2 opposite to each other. The guide roller 534 located below is rotatably disposed between the two bearing seats 2. A sliding hole 2 is opened on the mounting plate 5322. A bearing seat 3 is slidably disposed inside the sliding hole 2. The guide roller 534 located above is rotatably disposed between the two bearing seats 3.

[0061] The fixed cylinder 5321 provides a supporting foundation for the lifting platform 532, and the mounting plate 5322 serves as the mounting platform for the guide roller 534.

[0062] The electric push rod 5323 is installed inside the fixed cylinder 5321. When the piston rod of the electric push rod 5323 extends or retracts, it will drive the mounting plate 5322 to move up and down, thereby realizing the height adjustment of the guide roller 534.

[0063] The guide roller 534 located below is rotatably positioned between two bearing seats 2, and its height changes as the mounting plate 5322 is raised or lowered.

[0064] The upper guide roller 534 is rotatably positioned between the two bearing seats 3. By adjusting the position of the bearing seats 3 in the sliding hole 2, the distance between the upper and lower guide rollers 534 can be further fine-tuned.

[0065] like Figure 3 and Figure 5 As shown, the height adjustment unit 533 further includes an electric push rod three disposed above the mounting plate 5322. The piston rod of the electric push rod is connected to the bearing seat three and drives the bearing seat three to rise and fall.

[0066] When the piston rod of the electric push rod three extends or retracts, it will drive the bearing seat three connected to it to move up and down in the sliding hole two on the mounting plate 5322.

[0067] The upper guide roller 534 is rotatably positioned between the two bearing seats 3, so the raising and lowering of the bearing seats 3 will directly cause the height change of the upper guide roller 534.

[0068] By controlling the extension and retraction of the piston rod of the electric push rod three, the distance between the upper and lower guide rollers 534 can be precisely adjusted to meet the guiding needs of plastic products with different thicknesses or properties.

[0069] like Figure 2 and Figure 5 As shown, in one embodiment, the power unit 6 includes a second drive motor 61 and a second reducer 62 mounted on a base 51. The base 51 has an internal cavity and one end is open. A movable hole is also provided on the base 51. The output shaft of the second drive motor 61 is connected to the input shaft of the second reducer 62. The output shaft of the second reducer 62 passes through the movable hole and extends inward. A rack 63 is provided on the inner side of the base 51. A gear 64 is provided on the input shaft of the second reducer 62. The gear 64 meshes with the rack 63.

[0070] A rack 63 is provided on the inner side of the base 51, and the gear 64 meshes with the rack 63.

[0071] When the second drive motor 61 starts, the second reducer 62 reduces the output speed of the second drive motor 61 and increases the output torque through the transmission of the second reducer 62, which drives the gear 64 to rotate and move linearly along the rack 63. The movement of the gear 64 will drive the entire power unit 6 and the slide table 531 connected to it to move linearly on the base 51.

[0072] By controlling the forward and reverse rotation and speed of the drive motor 61, the moving direction and speed of the slide 531 can be precisely controlled.

[0073] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0074] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0075] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A calender for plastic processing, characterized by, include: A support platform (1) is rotatably mounted with an upper calendering roller (2) and a lower calendering roller (3) arranged vertically. A drive unit (7) is mounted on the support platform (1) to drive the lower calendering roller (3) to rotate. A lifting mechanism (4) is mounted on the support platform (1) and is connected to the upper calendering roller (2) to drive the upper calendering roller (2) to rise and fall. A guide mechanism (5) includes a base (51) mounted on one side of the support platform (1) and a fixed guide frame (52) and an adjusting guide frame (53) are mounted opposite each other on the base (51). The adjustment guide frame (53) includes a slide (531) set on the base (51), a lifting platform (532) set on the slide (531), a guide roller (534) arranged vertically and vertically rotatably set above the lifting platform (532), and a height adjustment unit (533) set above the lifting platform (532). The height adjustment unit (533) is connected to the guide roller (534) above and is used to adjust the distance between the two guide rollers (534). A power unit (6) is also provided on the base (51). The power unit (6) is connected to the slide (531) and is used to drive the slide (531) to move along the length of the base (51).

2. The calender for plastic processing as described in claim 1, characterized in that: Two first support columns (11) are arranged opposite each other on the support platform (1), and the lower rolling roller (3) is rotatably arranged between the two first support columns (11); The first support column (11) has a sliding hole, and a bearing seat (12) is slidably arranged inside the sliding hole. The upper calendering roller (2) is rotatably arranged between the two bearing seats (12).

3. A calender for plastic processing as described in claim 2, characterized in that: The lifting mechanism (4) includes an electric push rod mounted on the first support column (11), and the bottom end of the piston rod of the electric push rod is connected to the bearing seat (12).

4. A calender for plastic processing as described in claim 1, characterized in that: The driving component (7) includes a drive motor, a reducer and a housing (71) arranged sequentially on the support platform (1). There are two lower calendering rollers (3). One end of each lower calendering roller (3) extends into the housing (71). A pulley (72) is provided on one end of the lower calendering roller (3). The two pulleys (72) are driven by a belt. The output shaft of the drive motor is connected to the input shaft of the reducer, and the output shaft of the reducer is connected to one end of the extension of any of the lower calendering rolls (3).

5. A calender for plastic processing as described in claim 1, characterized in that: The fixed guide frame (52) is located between the lower calendering roll (3) and the adjusting guide frame (53); The fixed guide frame (52) includes a second support column (521) disposed opposite to the base (51), and two side plates (522) are disposed opposite to each other on the second support column (521), and a guide roller (523) is rotatably disposed between the two side plates (522).

6. A calender for plastic processing as described in claim 1, characterized in that: The slide (531) includes a slide rail (5311) disposed opposite to the base (51), and a plurality of sliders (5312) are slidably disposed on the slide rail (5311), and a support plate (5313) is disposed on the top of the plurality of sliders (5312).

7. A calender for plastic processing as described in claim 6, characterized in that: The lifting platform (532) includes a fixed cylinder (5321) disposed opposite to the support plate (5313), the top of the fixed cylinder (5321) abutting against the mounting plate (5322), and an electric push rod two (5323) disposed inside the fixed cylinder (5321), the top end of the piston rod of the electric push rod two (5323) being connected to the mounting plate (5322); The mounting plate (5322) has two bearing seats two opposite to each other. The guide roller (534) located below is rotatably disposed between the two bearing seats two. The mounting plate (5322) has a sliding hole two. A bearing seat three is slidably disposed inside the sliding hole two. The guide roller (534) located above is rotatably disposed between the two bearing seats three.

8. A calender for plastic processing as described in claim 7, characterized in that: The height adjustment unit (533) includes an electric push rod three disposed above the mounting plate (5322). The piston rod of the electric push rod is connected to the bearing seat three and drives the bearing seat three to rise and fall.

9. A calender for plastic processing as described in claim 1, characterized in that: The power unit (6) includes a second drive motor (61) and a second reducer (62) mounted on a base (51). The base (51) has a cavity inside and one end is open. The base (51) also has a moving hole. The output shaft of the second drive motor (61) is connected to the input shaft of the second reducer (62). The output shaft of the second reducer (62) passes through the moving hole and extends inward. A rack (63) is provided on the inner side of the base (51), and a gear (64) is provided on the input shaft of the reducer (62), and the gear (64) meshes with the rack (63).

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