Anti-film shrinkage floating edge clamp device and method of using same

Abstract

This invention discloses a floating edge-pressing device for preventing film shrinkage and its usage method. The device is located on the left side of the discharge roller of a calender and includes a front vertical lifting mechanism and a rear vertical lifting mechanism arranged symmetrically. A horizontal shaft is fixed between the front and rear vertical lifting mechanisms, and a lever-type rubber edge-pressing wheel assembly is provided on the front and rear sides of the horizontal shaft, respectively. This invention lowers the movable take-up wheels on both sides to facilitate pulling the film out of the discharge roller, and then raises the two movable take-up wheels and two rubber edge-pressing wheels. The film smoothly passes around the three take-up wheels, achieving anti-shrinkage edge pressing, which greatly improves the efficiency of the end-removal and edge-pressing work after calendering. Furthermore, this invention can adjust the edge-pressing position and pressure according to different film parameters such as temperature and thickness. More importantly, it maintains a floating state with the take-up wheels during the rolling edge-pressing process, thereby greatly improving the effect of edge pressing to prevent film shrinkage.

Description

Technical Field

[0001] This invention belongs to the field of PVC calendering production technology, specifically relating to a floating edge pressing device for preventing film shrinkage and its usage method. Background Technology

[0002] PVC calendered film is peeled from the discharge roller (lower roller) of the calender by a take-up roller assembly. The film is thinned by the longitudinal stretching of the take-up roller assembly and simultaneously guided to the subsequent embossing stage. The take-up roller assembly typically consists of three, five, or seven take-up rollers. Taking three take-up rollers as an example, the film passes over the three take-up rollers sequentially. However, due to the longitudinal (left-right) tension on the film, it is easily stretched (contracts in width) as it passes through the take-up roller assembly. Therefore, an edge-pressing device is needed on the take-up rollers. Currently, the edge-pressing device is generally installed on one of the take-up rollers. The edge-pressing device includes rubber edge-pressing wheels installed on both the front and rear sides of the take-up wheel. The rubber edge-pressing wheels are adjusted to apply appropriate pressure to the film, and then their positions are fixed. If the longitudinal position of the rubber edge-pressing wheels or the pressure on the film is not suitable after operation, it needs to be readjusted. In addition, due to changes in film temperature and thickness, as well as the runout of the outer ring of the take-up wheel surface, the pressure of the rubber edge-pressing wheels on the film needs to fluctuate slightly. That is, the rubber edge-pressing wheels cannot firmly press the film against the take-up wheel. The pressure of the rubber edge-pressing wheels on the film needs to be elastic and floating, which traditional edge-pressing devices cannot achieve. Summary of the Invention

[0003] The purpose of this invention is to provide a floating edge-pressing device and its method of use that prevents film shrinkage, is easy to adjust, allows for adjustable pressure on the film, and ensures that the film remains in contact with the take-up wheel during the edge-pressing process.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: a floating edge pressing device for preventing film shrinkage, which is set on the left side of the discharge roller of the calender, including a front vertical lifting mechanism and a rear vertical lifting mechanism arranged symmetrically. A horizontal shaft is fixed between the front vertical lifting mechanism and the rear vertical lifting mechanism, and a lever-type rubber edge pressing wheel assembly is respectively provided on the front side and the rear side of the horizontal shaft.

[0005] Two lever-type rubber pressing wheel assemblies are symmetrically arranged front and rear. The front lever-type rubber pressing wheel assembly includes a rocker arm, a rubber pressing wheel, a guide key, a rectangular pressing base, and a fixed cylinder. The rocker arm is inclined with the left side lower than the right side. The rectangular pressing base is oriented along the left-right direction in its length direction. A connecting cylinder is integrally provided at the right end of the rectangular pressing base. The inner circle of the rear side of the connecting cylinder has a stepped hole. The front end of the fixed cylinder is integrally provided with a positioning cylinder that extends into the stepped hole. The outer circle of the positioning cylinder has an annular groove. A guide screw is radially threaded to the rear side of the outer circle of the connecting cylinder. The inner end of the guide screw... The connecting cylinder and the fixed cylinder are inserted into the annular groove and are sleeved on the horizontal shaft. The guide key is fixedly installed on the top of the horizontal shaft along the axial direction of the horizontal shaft. The inner circles of the fixed cylinder and the connecting cylinder are provided with keyways that mate with the guide key. The width of the keyway on the connecting cylinder is greater than the width of the guide key. A locking screw is connected to the fixed cylinder along the radial thread. The inner end of the locking screw is pressed against the outer circle of the horizontal shaft. The left end of the rocker arm is fixedly connected to the right end of the connecting cylinder. The angle formed by the rocker arm and the rectangular pressure seat is an obtuse angle. The rubber pressure wheel is rotatably connected to the right end of the rocker arm through a bolt assembly.

[0006] The bolt assembly includes a screw shaft, a fastening nut, and a bearing. A rubber pressure wheel has a central hole along its centerline. The outer circle of the bearing is interference-fitted into the central hole. One end of the screw shaft extends into and is interference-fitted into the inner circle of the bearing. The other end of the screw shaft passes through the rocker arm and is fastened to the rocker arm through the fastening nut.

[0007] The front or rear side of the rectangular pressure base is integrally provided with a slide rail with a height smaller than that of the rectangular pressure base. A counterweight pressure block in the shape of a "U" is slidably connected on the slide rail. A fastening screw is threaded on the upper part of the counterweight pressure block. The lower end of the fastening screw is pressed against the upper surface of the slide rail. A scale is provided on the side of the slide rail along the length direction.

[0008] The guide key is 10mm wide, the keyway on the inner circle of the fixed cylinder is clearance-fitted with the guide key, and the keyway on the connecting cylinder is 20-30mm wide.

[0009] The guide key has several through countersunk holes along its length, and each countersunk hole is fixedly connected to the horizontal shaft by a countersunk bolt with an internal hex wrench head.

[0010] Both the front and rear vertical lifting mechanisms include a screw jack, two guide rails, a mounting frame, and a support base. The upper end of the screw jack is connected to the lower side of the mounting frame via a hinge. The two guide rails are arranged alternately on the left and right and are both vertically set. A sliding sleeve that is slidably connected to the guide rail is fixed on the mounting frame. The support base is fixed on the mounting frame, and the end of the horizontal shaft is fixedly connected to the support base. The top of the mounting frame of the front vertical lifting mechanism and the top of the mounting frame of the rear vertical lifting mechanism are provided with two movable take-up wheels, which are arranged alternately on the left and right. A fixed take-up wheel is provided between the two movable take-up wheels on the calender, and the rubber pressing wheel is located below the fixed take-up wheel.

[0011] The method of using the anti-film shrinkage floating edge pressing device includes the following steps:

[0012] (1) Film drawing: The film is taken out from the bottom of the discharge roller of the calender and pulled out from the take-up roller group to the left;

[0013] (2) Lifting wheel: Operate the front vertical lifting mechanism and the rear vertical lifting mechanism to lift the two movable lifting wheels and the two lever-type rubber pressing wheel assemblies to the preset height;

[0014] (3) Adjust the axial position of the rubber pressure roller and the pressure of the film.

[0015] Step (1) is as follows: The front vertical lifting mechanism and the rear vertical lifting mechanism are operated to move the mounting frame, two movable guide wheels and two lever-type rubber edge pressing wheel assemblies downward along the guide rail. The fixed guide wheel and the two movable guide wheels are arranged in a triangular shape, with a large space in the middle for easy head removal. The film after trimming is manually guided from the bottom of the discharge wheel to the left. The film is removed to the left below the fixed guide wheel and above the two movable guide wheels.

[0016] Step (2) is as follows: The screw jacks of the front and rear vertical lifting mechanisms drive the mounting frame to move upward along the guide rail. The two movable take-up wheels and the two lever-type rubber edge pressing wheel assemblies move upward together. The two movable take-up wheels lift the film upward and make the film wrap around the lower part of the outer circle of the fixed take-up wheel. After the center line of the movable take-up wheel and the center line of the fixed take-up wheel are at the same height, the screw jack is closed. At this time, the rubber edge pressing wheel presses the film at the bottom of the fixed take-up wheel, and there is a certain gap between the left side of the guide key and the left side wall of the keyway of the inner circle of the connecting cylinder.

[0017] Step (3) is as follows: First, loosen the locking screw on the fixed cylinder, move the fixed cylinder and connecting cylinder along the horizontal axis, and move the rubber pressure wheel at the right end of the rocker arm. After adjusting the axial position appropriately, tighten the locking screw to fix the fixed cylinder and the horizontal axis as one unit. Then, loosen the fastening screw on the counterweight pressure block, move the counterweight pressure block along the slide rail, and adjust the pressure of the rubber pressure wheel on the fixed guide wheel according to the distance of the counterweight pressure block from the center line of the horizontal axis based on the lever principle. Adjust the position of the counterweight pressure block according to the scale on the ruler to accurately calculate the pressure of the rubber pressure wheel on the fixed guide wheel. After adjusting the position of the small rubber edge pressing rollers, tighten the fastening screws. The lower end of the fastening screws presses against the top surface of the slide rail, and the counterweight pressure block is connected to the rectangular pressure seat as a whole. As the film passes through the discharge rollers and successively around the upper part of the right movable guide wheel, the lower part of the fixed guide wheel, and the upper part of the left movable guide wheel, the two rubber edge pressing rollers press the film firmly against the lower part of the fixed guide wheel with constant pressure. Due to changes in film temperature and thickness, as well as the runout of the outer ring of the fixed guide wheel, the rubber edge pressing rollers will also have slight fluctuations. At this time, the annular groove and the guide screw move relative to each other, and the keyway in the connecting cylinder moves relative to the guide key.

[0018] By adopting the above technical solution, compared with the prior art, the present invention has the following technical effects:

[0019] 1) By raising and lowering two lever-type rubber edge pressing roller assemblies and two movable take-up rollers, a convenient operating space is provided for taking up the calendered film, which improves the working efficiency of the take-up film head.

[0020] 2) After the head is removed, the two lever-type rubber edge pressing wheel assemblies and two movable take-up wheels on the lifting mounting frame are used to directly and smoothly pass the film around the outer circle of the three take-up wheels, without having to pass the film through from right to left and cause the film to wrinkle.

[0021] 3) The connecting cylinder and the fixed cylinder are fixed together in the axial direction by the guide screw extending into the annular groove. In the circumferential direction, there can be a certain amount of reciprocating relative rotation (the guide key moves in the left and right directions in the keyway). This allows the rubber pressure roller to float freely when following the movement of the fixed take-up roller, thereby ensuring that the rubber pressure roller maintains a basically constant pressure on the film.

[0022] 4) Using the lever principle, with the horizontal axis as the fulcrum, the weight of the rectangular pressure block and the counterweight pressure block is used to press the edge of the film by the rubber pressing wheel. According to the changes in film temperature and thickness, the pressure of the rubber pressing wheel on the film is adjusted by adjusting the distance of the counterweight pressure block from the center line of the horizontal axis, so as to prevent the film after calendering from being pulled to the left and shrinking in the width direction.

[0023] 5) The position of the rubber pressure roller pressing the film (the distance from the side of the film) is adjusted by moving the fixed cylinder in the axial position of the horizontal axis. Loosening the locking screw allows the fixed cylinder and connecting cylinder to move back and forth along the guide key. After they are in place, tightening the locking screw to press the horizontal axis positions the fixed cylinder and connecting cylinder. The inner end of the guide screw extends into the annular groove, which not only guides the connecting cylinder to move back and forth slightly in the circumferential direction, but also keeps the connecting cylinder and the fixed cylinder fixedly connected in the axial direction.

[0024] In summary, this invention first lowers the movable take-up rollers on both sides to facilitate pulling the film out of the discharge roller, and then raises the two movable take-up rollers and two rubber edge-pressing rollers. The film smoothly passes around the three take-up rollers and achieves anti-shrinkage edge pressing, greatly improving the efficiency of the end-removal and edge-pressing work after calendering. Furthermore, this invention can adjust the edge-pressing position and pressure according to different film parameters such as temperature and thickness. More importantly, it maintains a floating state along with the take-up rollers during the rolling edge-pressing process, thereby greatly improving the effect of edge pressing to prevent film shrinkage. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the invention installed on a calender;

[0026] Figure 2 This is a schematic diagram of the structure of the present invention when the screw jack is in its lowest position before film insertion;

[0027] Figure 3 This is a schematic diagram of the structure of the screw jack when the lifting wheel is in its highest position.

[0028] Figure 4 This is a schematic diagram of the assembly structure of the horizontal shaft and two lever-type rubber pressure rollers;

[0029] Figure 5 yes Figure 4 Enlarged view of the assembly between the connecting cylinder and the fixed cylinder;

[0030] Figure 6 yes Figure 4 Side view of the lever-type rubber pressure wheel assembly;

[0031] Figure 7 yes Figure 6 Sectional view of AA;

[0032] Figure 8 This is a schematic diagram of the guide key. Detailed Implementation

[0033] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0034] like Figures 1-8As shown, the anti-film shrinkage floating edge pressing device of the present invention is located on the left side of the discharge roller 5 of the calender 30, including a front vertical lifting mechanism 31 and a rear vertical lifting mechanism (not shown) arranged symmetrically. A horizontal shaft 32 is fixed between the front vertical lifting mechanism 31 and the rear vertical lifting mechanism. A lever-type rubber edge pressing wheel assembly 59 is provided on the front side and the rear side of the horizontal shaft 32, respectively.

[0035] Two lever-type rubber pressing wheel assemblies 59 are symmetrically arranged front and rear. The front lever-type rubber pressing wheel assembly 59 includes a rocker arm 33, a rubber pressing wheel 34, a guide key 35, a rectangular pressing seat 36, and a fixing cylinder 37. The rocker arm 33 is inclined with the left side lower than the right side. The rectangular pressing seat 36 is arranged along the left and right directions in its length direction. A connecting cylinder 38 is integrally provided at the right end of the rectangular pressing seat 36. The inner circle of the rear side of the connecting cylinder 38 has a stepped hole. The front end of the fixing cylinder 37 is integrally provided with a positioning cylinder 39 that extends into the stepped hole. The outer circle of the positioning cylinder 39 has an annular groove 40. A guide screw 41 is radially threaded to the rear side of the outer circle of the connecting cylinder 38. The inner end of the guide screw 41 extends into the annular groove. Inside the groove 40, the connecting cylinder 38 and the fixed cylinder 37 are sleeved on the horizontal shaft 32. The guide key 35 is fixedly installed on the top of the horizontal shaft 32 along the axial direction of the horizontal shaft 32. The inner circle of the fixed cylinder 37 and the inner circle of the connecting cylinder 38 are provided with keyways 42 that mate with the guide key 35. The width of the keyway 42 on the connecting cylinder 38 is greater than the width of the guide key 35. A locking screw 43 is connected to the fixed cylinder 37 radially. The inner end of the locking screw 43 is pressed against the outer circle of the horizontal shaft 32. The left end of the rocker arm 33 is fixedly connected to the right end of the connecting cylinder 38. The angle formed by the rocker arm 33 and the rectangular pressure seat 36 is an obtuse angle. The rubber pressure wheel 34 is rotatably connected to the right end of the rocker arm 33 through a bolt assembly.

[0036] The bolt assembly includes a screw shaft 44, a fastening nut 45, and a bearing 46. The rubber pressure wheel 34 has a central hole along the center line. The outer circle of the bearing 46 is interference-fitted into the central hole. One end of the screw shaft 44 extends into and is interference-fitted into the inner circle of the bearing 46. The other end of the screw shaft 44 passes through the rocker arm 33 and is fastened to the rocker arm 33 through the fastening nut 45.

[0037] The rectangular pressure base 36 has an integral slide rail 47 with a height smaller than that of the rectangular pressure base 36 on its front or rear side. A counterweight pressure block 48 in the shape of a "U" is slidably connected to the slide rail 47. A fastening screw 49 is threadedly connected to the upper part of the counterweight pressure block 48. The lower end of the fastening screw 49 is pressed against the upper surface of the slide rail 47. A scale 50 is provided on the side of the slide rail 47 along the length direction.

[0038] The guide key 35 has a width of 10mm, the keyway 42 on the inner circle of the fixed cylinder 37 is clearance-fitted with the guide key 35, and the keyway 42 on the connecting cylinder 38 has a width of 20-30mm.

[0039] The guide key 35 has several through countersunk holes 51 along its length. Each countersunk hole 51 is fixedly connected to the horizontal shaft 32 by a countersunk bolt with an internal hexagonal wrench head.

[0040] Both the front vertical lifting mechanism 31 and the rear vertical lifting mechanism include a screw jack 52, two guide rails 53, a mounting frame 54, and a support base 55. The upper end of the screw jack 52 is connected to the lower side of the mounting frame 54 via a hinge. The two guide rails 53 are arranged at intervals on the left and right and are both vertically set. A sliding sleeve 56 is fixedly provided on the mounting frame 54 and slidably connected to the guide rails 53. The support base 55 is fixedly set on the mounting frame 54, and the end of the horizontal shaft 32 is fixedly connected to the support base 55. The top of the mounting frame 54 of the front vertical lifting mechanism 31 and the top of the mounting frame 54 of the rear vertical lifting mechanism are provided with two movable take-up wheels 57. The two movable take-up wheels 57 are arranged at intervals on the left and right. A fixed take-up wheel 58 is provided between the two movable take-up wheels 57 on the calender 30. The rubber pressing wheel 34 is located below the fixed take-up wheel 58.

[0041] The method of using the anti-film shrinkage floating edge pressing device includes the following steps:

[0042] (1) Film drawing: The film is taken out from the bottom of the discharge roller 5 of the calender 30 and pulled out from the take-up roller group to the left;

[0043] (2) Lifting wheel: Operate the front vertical lifting mechanism 31 and the rear vertical lifting mechanism to lift the two movable lifting wheels 57 and the two lever-type rubber pressing wheels 34 to the preset height;

[0044] (3) Adjust the axial position of the rubber pressure roller 34 and the pressure of the film.

[0045] Step (1) is as follows: The front vertical lifting mechanism 31 and the rear vertical lifting mechanism are operated to move the mounting frame 54, the two movable take-up wheels 57 and the two lever-type rubber edge pressing wheels 34 assembly downward along the guide rail 53. The fixed take-up wheel 58 and the two movable take-up wheels 57 are arranged in a triangular shape, with a large space in the middle for easy head removal. The film 60 after trimming is manually taken from the bottom of the discharge wheel to the left. The film 60 is removed to the left below the fixed take-up wheel 58 and above the two movable take-up wheels 57.

[0046] Step (2) is as follows: The screw jacks 52 of the front vertical lifting mechanism 31 and the rear vertical lifting mechanism drive the mounting frame 54 to move upward along the guide rail 53. The two movable take-up wheels 57 and the two lever-type rubber pressing wheels 34 move upward together. The two movable take-up wheels 57 lift the film 60 upward and make the film 60 wrap around the lower part of the outer circle of the fixed take-up wheel 58 until the center line of the movable take-up wheel 57 and the center line of the fixed take-up wheel 58 are at the same height. Then the screw jack 52 is closed. At this time, the rubber pressing wheel 34 presses the film 60 at the bottom of the fixed take-up wheel 58. There is a certain gap between the left side of the guide key 35 and the left side wall of the keyway 42 of the inner circle of the connecting cylinder 38.

[0047] Step (3) is as follows: First, loosen the locking screw 43 on the fixed cylinder 37, move the fixed cylinder 37 and the connecting cylinder 38 along the horizontal axis 32, and move the rubber pressure wheel 34 at the right end of the rocker arm 33. After the axial position is properly adjusted, tighten the locking screw 43 to fix the fixed cylinder 37 and the horizontal axis 32 into one unit. Then, loosen the fastening screw 49 on the counterweight pressure block 48, move the counterweight pressure block 48 along the slide rail 47, and adjust the pressure of the rubber pressure wheel 34 on the fixed guide wheel 58 according to the distance of the counterweight pressure block 48 from the center line of the horizontal axis 32 based on the lever principle. Adjust the position of the counterweight pressure block 48 according to the scale on the scale 50 to accurately calculate the pressure of the rubber pressure wheel 34 on the fixed guide wheel 58. After adjusting the size and position of the rubber edge pressing wheel 34, tighten the fastening screw 49. The lower end of the fastening screw 49 presses against the top surface of the slide rail 47. The counterweight pressure block 48 is connected to the rectangular pressure seat 36 as a whole. As the film 60 passes through the discharge roller 5 in sequence around the upper part of the right movable guide wheel 57, the lower part of the fixed guide wheel 58, and the upper part of the left movable guide wheel 57, the two rubber edge pressing wheels 34 press the film 60 tightly against the lower part of the fixed guide wheel 58 with constant pressure. Due to the changes in the temperature and thickness of the film 60, as well as the jump of the outer ring of the fixed guide wheel 58, the rubber edge pressing wheel 34 will also have a slight floating. At this time, the annular groove 40 moves relative to the guide screw 41, and the keyway 42 in the connecting cylinder 38 moves relative to the guide key 35.

[0048] The above embodiments illustrate the basic principles and features of the present invention, but are merely preferred embodiments and are not limited to these embodiments. Those skilled in the art, inspired by this patent, can make many modifications and improvements without departing from the spirit and scope of the claims, all of which fall within the scope of protection of the present invention. Therefore, the scope of this patent and its protection should be determined by the appended claims.

Claims

1. A floating edge-pressing device for preventing film shrinkage, located on the left side of the discharge roller of a calender, characterized in that: It includes a front vertical lifting mechanism and a rear vertical lifting mechanism arranged symmetrically. A horizontal shaft is fixed between the front vertical lifting mechanism and the rear vertical lifting mechanism. A lever-type rubber pressure wheel assembly is provided on the front side and the rear side of the horizontal shaft, respectively. Two lever-type rubber pressing wheel assemblies are symmetrically arranged front and rear. The front lever-type rubber pressing wheel assembly includes a rocker arm, a rubber pressing wheel, a guide key, a rectangular pressing base, and a fixed cylinder. The rocker arm is inclined with the left side lower than the right side. The rectangular pressing base is oriented along the left-right direction in its length direction. A connecting cylinder is integrally provided at the right end of the rectangular pressing base. The inner circle of the rear side of the connecting cylinder has a stepped hole. The front end of the fixed cylinder is integrally provided with a positioning cylinder that extends into the stepped hole. The outer circle of the positioning cylinder has an annular groove. A guide screw is radially threaded to the rear side of the outer circle of the connecting cylinder. The inner end of the guide screw... The connecting cylinder and the fixed cylinder are inserted into the annular groove and are sleeved on the horizontal shaft. The guide key is fixedly installed on the top of the horizontal shaft along the axis of the horizontal shaft. The inner circles of the fixed cylinder and the connecting cylinder are provided with keyways that mate with the guide key. The width of the keyway on the connecting cylinder is greater than the width of the guide key. A locking screw is connected to the fixed cylinder along the radial thread. The inner end of the locking screw is pressed against the outer circle of the horizontal shaft. The left end of the rocker arm is fixedly connected to the right end of the connecting cylinder. The angle formed by the rocker arm and the rectangular pressure seat is an obtuse angle. The rubber pressure wheel is rotatably connected to the right end of the rocker arm through a bolt assembly. The front or rear side of the rectangular pressure base is integrally provided with a slide rail with a height smaller than that of the rectangular pressure base. A counterweight pressure block in the shape of a "U" is slidably connected on the slide rail. A fastening screw is threaded on the upper part of the counterweight pressure block. The lower end of the fastening screw is pressed against the upper surface of the slide rail. A scale is provided on the side of the slide rail along the length direction. The guide key is 10mm wide, and the keyway on the inner circle of the fixed cylinder is clearance-fitted with the guide key. The keyway on the connecting cylinder is 20-30mm wide. The guide key has several through countersunk holes along its length. Each countersunk hole is fixedly connected to the horizontal shaft by a countersunk bolt with an internal hexagonal wrench head.

2. The anti-film shrinkage floating edge pressing device according to claim 1, characterized in that: The bolt assembly includes a screw shaft, a fastening nut, and a bearing. A rubber pressure wheel has a central hole along its centerline. The outer circle of the bearing is interference-fitted into the central hole. One end of the screw shaft extends into and is interference-fitted into the inner circle of the bearing. The other end of the screw shaft passes through the rocker arm and is fastened to the rocker arm through the fastening nut.

3. The anti-film shrinkage floating edge pressing device according to claim 2, characterized in that: Both the front and rear vertical lifting mechanisms include a screw jack, two guide rails, a mounting frame, and a support base. The upper end of the screw jack is connected to the lower side of the mounting frame via a hinge. The two guide rails are arranged alternately on the left and right and are both vertically set. A sliding sleeve that is slidably connected to the guide rail is fixed on the mounting frame. The support base is fixed on the mounting frame, and the end of the horizontal shaft is fixedly connected to the support base. The top of the mounting frame of the front vertical lifting mechanism and the top of the mounting frame of the rear vertical lifting mechanism are provided with two movable take-up wheels, which are arranged alternately on the left and right. A fixed take-up wheel is provided between the two movable take-up wheels on the calender, and the rubber pressing wheel is located below the fixed take-up wheel.

4. The method of using the anti-film shrinkage floating edge pressing device as described in claim 3, characterized in that: Includes the following steps: (1) Film drawing: The film is taken out from the bottom of the discharge roller of the calender and pulled out from the take-up roller group to the left; (2) Lifting wheel: Operate the front vertical lifting mechanism and the rear vertical lifting mechanism to lift the two movable lifting wheels and the two lever-type rubber pressing wheel assemblies to the preset height; (3) Adjust the axial position of the rubber pressure roller and the pressure of the film.

5. The method of using the anti-film shrinkage floating edge pressing device according to claim 4, characterized in that: Step (1) is as follows: The front vertical lifting mechanism and the rear vertical lifting mechanism are operated to move the mounting frame, two movable guide wheels and two lever-type rubber edge pressing wheel assemblies downward along the guide rail. The fixed guide wheel and the two movable guide wheels are arranged in a triangular shape, with a large space in the middle for easy head removal. The film after trimming is manually guided from the bottom of the discharge wheel to the left. The film is removed to the left below the fixed guide wheel and above the two movable guide wheels.

6. The method of using the anti-film shrinkage floating edge pressing device according to claim 5, characterized in that: Step (2) is as follows: The screw jacks of the front and rear vertical lifting mechanisms drive the mounting frame to move upward along the guide rail. The two movable take-up wheels and the two lever-type rubber edge pressing wheel assemblies move upward together. The two movable take-up wheels lift the film upward and make the film wrap around the lower part of the outer circle of the fixed take-up wheel. After the center line of the movable take-up wheel and the center line of the fixed take-up wheel are at the same height, the screw jack is closed. At this time, the rubber edge pressing wheel presses the film at the bottom of the fixed take-up wheel, and there is a certain gap between the left side of the guide key and the left side wall of the keyway of the inner circle of the connecting cylinder.

7. The method of using the anti-film shrinkage floating edge pressing device according to claim 6, characterized in that: Step (3) is as follows: First, loosen the locking screw on the fixed cylinder, move the fixed cylinder and connecting cylinder along the horizontal axis, and move the rubber pressure wheel at the right end of the rocker arm. After adjusting the axial position appropriately, tighten the locking screw to fix the fixed cylinder and the horizontal axis as one unit. Then, loosen the fastening screw on the counterweight pressure block, move the counterweight pressure block along the slide rail, and adjust the pressure of the rubber pressure wheel on the fixed guide wheel according to the distance of the counterweight pressure block from the center line of the horizontal axis based on the lever principle. Adjust the position of the counterweight pressure block according to the scale on the ruler to accurately calculate the pressure of the rubber pressure wheel on the fixed guide wheel. After adjusting the position of the small rubber edge pressing rollers, tighten the fastening screws. The lower end of the fastening screws presses against the top surface of the slide rail, and the counterweight pressure block is connected to the rectangular pressure seat as a whole. As the film passes through the discharge rollers and successively around the upper part of the right movable guide wheel, the lower part of the fixed guide wheel, and the upper part of the left movable guide wheel, the two rubber edge pressing rollers press the film firmly against the lower part of the fixed guide wheel with constant pressure. Due to changes in film temperature and thickness, as well as the runout of the outer ring of the fixed guide wheel, the rubber edge pressing rollers will also have slight fluctuations. At this time, the annular groove and the guide screw move relative to each other, and the keyway in the connecting cylinder moves relative to the guide key.

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