A polytetrafluoroethylene film winding device

Abstract

The application discloses a polytetrafluoroethylene film winding device, which comprises a base, a winding assembly, an extrusion assembly and a tension adjusting assembly. The base is provided with a rack, and the rack is adapted to be moved along the vertical direction. The winding assembly comprises a winding base arranged on the base and a winding roller rotatably arranged on the winding base and used for winding the film into a roll. The extrusion assembly comprises a floating support slidably arranged on the rack along the vertical direction, an adjusting support arranged on the floating support, and a compression roller rotatably arranged on the adjusting support and adapted to compress the film. A first elastic member is arranged between the floating support and the rack. The tension adjusting assembly comprises a driving tension roller, a first driven tension roller and a second driven tension roller. The base is provided with a moving seat slidably arranged along the vertical direction. The driving tension roller is rotatably arranged on the moving seat. The adjustment of the winding tension and the increase of the winding diameter are cooperatively arranged, so that the tension can be more accurately adjusted.

Description

Technical Field

[0001] This invention relates to the field of film winding technology, specifically to a polytetrafluoroethylene (PTFE) film winding device. Background Technology

[0002] Currently, polytetrafluoroethylene (PTFE) films have extremely low coefficients of friction, high transverse shrinkage stress, and are thin, lightweight, and their microporous structure makes them susceptible to deformation under pressure. The control of tension during the winding process directly determines the flatness and end face regularity of the finished roll, and also directly affects the occurrence rate of defects such as edge flanging, interlayer slippage, and roll adhesion. It is the core control link in the film forming process.

[0003] A search revealed a patent with publication number CN213264902U that discloses a stable winding device for a film winding machine. This patent uses a pressure sensor to monitor the pressure generated by the rollers that support the film in real time and adjusts the tension by changing the distance between the rollers. This setup has a fatal flaw: due to the signal delay caused by the sensor monitoring method, it cannot adaptively adjust the tension in real time according to the continuous change of the roll diameter. The roll diameter increases continuously, and the electronic control is segmented, which cannot achieve a smooth gradient tension without interruption. It is difficult to form a relatively ideal roll material that is loose on the inside and tight on the outside or tight on the inside and loose on the outside. The delay in tension adjustment will cause the film to be overstretched. The relatively thin PTFE film will collapse after being overstretched and stretched, and the air permeability and other indicators of the finished product will not meet the standards. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a polytetrafluoroethylene film winding device that coordinates the adjustment of film winding tension with the increase of winding diameter to achieve more accurate tension adjustment.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a polytetrafluoroethylene film winding device, comprising:

[0006] A base, on which a frame is mounted, the frame being adapted to be moved vertically;

[0007] A winding assembly, comprising a winding base disposed on the base and a winding roller rotatably disposed on the winding base for winding a film into a roll;

[0008] An extrusion assembly, comprising a floating support slidably disposed vertically on the frame and an adjusting support disposed on the floating support, and a pressure roller rotatably disposed on the adjusting support and adapted to press a film on a receiving roll, wherein a first elastic element is disposed between the floating support and the frame;

[0009] A tension adjustment assembly includes an active tension roller, a first driven tension roller, and a second driven tension roller. A movable seat is slidably disposed vertically on the base. The active tension roller is rotatably mounted on the movable seat. The first and second driven tension rollers are symmetrically arranged vertically and rotatably mounted on a floating support. The second driven tension roller is located above the first driven tension roller. When the take-up roller is actuated to rotate and take up the film, the film roll diameter on the take-up roller gradually increases, and the floating support moves upward through the pressure roller. Furthermore, the floating support drives the first and second driven tension rollers to move upward synchronously.

[0010] During its movement, the active tension roller has an upper position in the vertical direction that is higher than the second driven tension roller and a lower position in the vertical direction that is lower than the first driven tension roller;

[0011] When the active tension roller is in the upper position, the film passes sequentially around the upper side of the active tension roller, the lower side of the second driven tension roller, and between the pressure roller and the take-up roller;

[0012] When the active tension roller is in the lower position, the film passes sequentially around the lower side of the active tension roller, the upper side of the first driven tension roller, and between the pressure roller and the take-up roller.

[0013] Furthermore, in order to adjust the pre-pressure applied to the film, the base is provided with a height adjustment component connected to the frame, which is adapted to drive the frame to move linearly in the vertical direction.

[0014] Furthermore, to better adjust the position of the active tension roller, a position adjustment mechanism is provided on the base. The position adjustment mechanism is connected to the movable seat to drive the movable seat to move in the vertical direction, thereby driving the active tension roller to move.

[0015] Furthermore, to ensure that the baffle can adaptively generate effective axial end face limiting according to the width of the film to be wound and the size of the roll diameter after winding, two adjustment brackets are provided. The pressure roller includes a replacement roller and a docking roller rotatably mounted on the corresponding adjustment bracket. A replacement station is provided between the two docking rollers. The replacement roller is located at the replacement station. The replacement station is suitable for placing any specified length of the replacement roller. The two docking rollers are suitable for being actuated to dock with the replacement roller located in the replacement station to form a complete pressure roller, so that the length of the pressure roller is adapted to the width of the film.

[0016] The two adjusting brackets are slidably disposed on the floating bracket along the axial direction of the pressure roller. The two adjusting brackets are adapted to be moved to move towards or away from each other, thereby driving the corresponding docking rollers to move towards or away from each other. When the two docking rollers are moved towards each other, the two docking rollers dock with the replacement roller located at the changing station.

[0017] A baffle is vertically slidable downward inside the adjusting bracket. A second elastic element is provided between the baffle and the adjusting bracket. The baffle is adapted to extend partially out of the corresponding adjusting bracket and abut against the outer wall surface of the take-up roller. The two baffles constrain the two axial positions of the film on the take-up roller.

[0018] Furthermore, the floating support is provided with a docking adjustment mechanism, which includes a docking motor mounted on the floating support and a first bidirectional screw rotatably mounted on the floating support. The first bidirectional screw has two oppositely arranged threads, and a first mating nut is respectively connected to the two oppositely arranged threads. The adjustment bracket is mounted on the corresponding first mating nut. The output end of the docking motor is coaxially connected to the first bidirectional screw to drive the first bidirectional screw to rotate, thereby driving the two adjustment brackets to move towards or away from each other along the axial direction of the first bidirectional screw.

[0019] Furthermore, the docking roller has a groove, and an extension plate is provided on the corresponding adjustment bracket. The docking roller is rotatably mounted on the corresponding extension plate through the bottom wall of the groove.

[0020] Furthermore, the baffle includes a lower end portion and a side portion, the lower end portion abutting against the take-up roller, the lower end portion being arc-shaped, and the arc matching the arc of the corresponding take-up roller;

[0021] The side portion is adapted to constrain the axial position of the film on the take-up roller.

[0022] Furthermore, multiple contact rollers are rotatably mounted at the lower end of the baffle, and the multiple contact rollers are arranged along the arc of the lower end.

[0023] Furthermore, to ensure that the baffle can return to its corresponding adjustment bracket regardless of how far it extends, the adjustment bracket is provided with a reset assembly, which includes:

[0024] A movable plate is mounted on the baffle;

[0025] A push plate that is vertically slidable on the adjusting bracket, the push plate having an upper working position and a lower working position;

[0026] A reset drive component is mounted on the adjusting bracket, and the reset drive component is connected to the push plate to move the push plate to either the upper or lower working position; wherein...

[0027] When the push plate is located at the lower station, the push plate is adapted to limit the maximum stroke of the baffle extending out of the adjusting bracket through the second elastic element. When the push plate is located at the maximum stroke of the adjusting bracket, the push plate located at the lower station abuts against the moving plate.

[0028] When the push plate is moved from the lower station to the upper station, the push plate is adapted to contact the moving plate and drive the moving plate to move to the upper station, so that the baffle is completely inserted into the corresponding adjustment bracket.

[0029] Furthermore, the reset drive component includes a reset motor and a reset screw and nut assembly. The reset screw and nut assembly includes a reset threaded rod rotatably mounted on the adjusting bracket and a reset nut connected to the reset threaded rod. The push plate is mounted on the reset nut, and the reset motor is mounted on the adjusting bracket. The output end of the reset motor is coaxially connected to the reset threaded rod to drive the reset threaded rod to rotate, thereby driving the push plate to move linearly along the axis of the reset threaded rod.

[0030] By adopting the above technical solution, the present invention has the following beneficial effects:

[0031] The film end is connected to the take-up roller. The actuating frame moves vertically downward, causing the pressure roller and take-up roller to work together to compress the film between them. Based on this, the frame moves further downward a specified distance. The pre-pressure applied to the film by the pressure roller can be controlled by compressing the first elastic element. After the pre-pressure is adjusted, the actuating take-up roller rotates, allowing for continuous film winding. As the film is continuously wound, the roll diameter gradually increases, pushing the pressure roller and its connected floating support upward. To accommodate different types of PTFE films, a first driven tension roller and a second driven tension roller are provided. When the film to be wound is a film with micropores, a coating, or a composite layer on its surface, the active tension roller... When the tension roller is in the lower position, in order to achieve a loose inner and tight outer winding, as the roll diameter increases, the pressure roller and floating support are moved upward, simultaneously driving the first and second driven tension rollers to move upward synchronously. This gradually increases the height difference between the first driven tension roller and the active tension roller in the lower position, thus gradually increasing the tension. When the film to be wound is a solid film without micropores, coatings, or adhesive backing, the active tension roller is in the upper position. In order to achieve a tight inner and loose outer winding, as the roll diameter increases, the pressure roller and floating support are moved upward, simultaneously driving the first and second driven tension rollers to move upward synchronously. This gradually decreases the height difference between the second driven tension roller and the active tension roller in the upper position, thus gradually decreasing the tension. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a schematic diagram of one of the film winding paths of the present invention;

[0034] Figure 3 This is a schematic diagram of another film winding path according to the present invention;

[0035] Figure 4 This is a schematic diagram of the position adjustment mechanism of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the fixed base and the movable base of the present invention;

[0037] Figure 6 This is a schematic diagram of the pressure roller structure of the present invention;

[0038] Figure 7 This is a schematic diagram of the baffle structure of the present invention;

[0039] Figure 8 This is a schematic diagram of the docking adjustment mechanism of the present invention;

[0040] Figure 9 This is a schematic diagram showing the abutting position relationship between the baffle and the winding roller of the present invention;

[0041] Figure 10 This is a schematic diagram of the structure at the lower end of the baffle of the present invention;

[0042] Figure 11 This is a schematic diagram of the reset component structure of the present invention;

[0043] Figure 12 This is a schematic diagram of the replacement component location for the present invention. Figure 1 ;

[0044] Figure 13 This is a schematic diagram of the replacement component location for the present invention. Figure 2

[0045] Figure 14 This is a schematic diagram of the replacement component structure of the present invention;

[0046] Figure 15 This is a schematic diagram of the structure at the joint between the docking roller and the replacement roller of the present invention;

[0047] In the diagram: 1. Base; 11. Frame; 12. Take-up roller; 13. Height adjustment component; 14. Air shaft; 15. Paper roll; 16. Fixed base; 17. Movable base; 18. Rotary base; 19. Adjustment motor; 110. First threaded rod; 111. First electrically controlled slide rail;

[0048] 2. Floating support; 21. Adjusting support; 22. Pressure roller; 23. First elastic element; 24. Connecting roller; 25. Replacement roller; 26. Changing station; 27. First bidirectional screw; 28. Connecting motor; 29. ​​Groove; 210. Extension plate;

[0049] 3. Active tension roller; 31. First driven tension roller; 32. Second driven tension roller; 33. Movable seat;

[0050] 4. Baffle; 41. Second elastic element; 42. Lower end; 43. Side; 44. Contact roller; 45. Moving plate; 46. Push plate; 47. Reset threaded rod; 48. Reset motor;

[0051] 5. Second electrically controlled slide rail; 51. Sliding base; 52. Moving bracket; 53. Placement plate; 54. Centering plate; 55. Moving motor; 56. Second threaded rod; 57. Centering motor; 58. Second bidirectional screw;

[0052] 6. First magnetic attraction part; 61. Second magnetic attraction part. Detailed Implementation

[0053] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0054] Example 1: As Figure 1-4 As shown, a polytetrafluoroethylene film winding device includes:

[0055] A base 1 is provided, and a frame 11 is provided on the base 1. The frame 11 is adapted to be moved vertically.

[0056] The winding assembly includes a winding base disposed on a base 1 and a winding roller 12 rotatably disposed on the winding base for winding the film into a roll.

[0057] The extrusion assembly includes a floating support 2 that is slidably disposed on the frame 11 along the vertical direction, an adjusting support 21 disposed on the floating support 2, and a pressure roller 22 that is rotatably disposed on the adjusting support 21 and adapted to press the film on the receiving roll 12. A first elastic element 23 is disposed between the floating support 2 and the frame 11.

[0058] The tension adjustment assembly includes an active tension roller 3, a first driven tension roller 31, and a second driven tension roller 32. A movable seat 33 is vertically slidably mounted on the base 1. The active tension roller 3 is rotatably mounted on the movable seat 33. The first driven tension roller 31 and the second driven tension roller 32 are rotatably mounted on a floating support 2 in a symmetrical vertical arrangement. The second driven tension roller 32 is located above the first driven tension roller 31. When the take-up roller 12 is rotated to take up the film, the diameter of the film roll on the take-up roller 12 gradually increases, and the floating support 2 moves upward through the pressure roller 22. This, in turn, causes the first driven tension roller 31 and the second driven tension roller 32 to move upward synchronously.

[0059] During its movement, the active tension roller 3 has an upper position in the vertical direction that is higher than the second driven tension roller 32 and a lower position in the vertical direction that is lower than the first driven tension roller 31;

[0060] When the active tension roller 3 is in the upper position, the film passes sequentially over the upper side of the active tension roller 3, the lower side of the second driven tension roller 32, and between the pressure roller 22 and the winding roller 12.

[0061] When the active tension roller 3 is in the lower position, the film passes sequentially around the lower side of the active tension roller 3, the upper side of the first driven tension roller 31, and between the pressure roller 22 and the winding roller 12.

[0062] In this embodiment, the film end is connected to the take-up roller 12. The actuating frame 11 moves vertically downward, causing the pressure roller 22 and the take-up roller 12 to cooperate in squeezing the film between them. Based on this, the frame 11 moves further downward by a specified distance. The pre-pressure generated by the pressure roller 22 on the film can be controlled by squeezing the first elastic element 23. After the pre-pressure is adjusted, the actuating take-up roller 12 rotates, and the film can be continuously wound up. As the film is continuously wound up, the roll diameter of the film gradually increases, thereby pushing the pressure roller 22 and the floating support 2 connected to it to move upward. To handle the winding of different types of PTFE films, a first driven tension roller 31 and a second driven tension roller 32 are provided. When the film to be wound up is a film with micropores and a coating or composite layer on the surface, etc. When the active tension roller 3 is located in the lower position, in order to achieve a loose inner and tight outer winding, as the roll diameter increases, the pressure roller 22 and the floating support 2 are moved upward, simultaneously driving the first driven tension roller 31 and the second driven tension roller 32 to move upward synchronously, so that the height difference between the first driven tension roller 31 and the active tension roller 3 located in the lower position gradually increases, thereby gradually increasing the tension. When the film to be wound is a solid film without micropores, coatings, or adhesive, etc., when the active tension roller 3 is located in the upper position, in order to achieve a tight inner and loose outer winding, as the roll diameter increases, the pressure roller 22 and the floating support 2 are moved upward, simultaneously driving the first driven tension roller 31 and the second driven tension roller 32 to move upward synchronously, so that the height difference between the second driven tension roller 32 and the active tension roller 3 located in the upper position gradually decreases, thereby gradually decreasing the tension.

[0063] It should be noted that there are many types of PTFE, and different types of PTFE films require different winding methods, which can be used to classify the film substrate structure.

[0064] When the film to be wound is a film with micropores, a coating, or a composite layer on its surface, taking adhesive-backed PTFE film as an example, to avoid excessive pressure between adjacent films after winding, which could cause the adhesive to squeeze through the micropores and cause the adjacent films to stick together, a film winding path with the active tension roller 3 located at the lower position is adopted. Under this winding path, the initial tension is small, reducing the mutual pressure between the films in the early stage of winding and preventing sticking. Subsequently, as the roll diameter increases, the tension gradually increases to constrain the roll and limit the axial movement between adjacent films. Since the pressure on the roll is greater closer to the center of the winding roller (i.e., the inner layer) and less further away from the center of the winding roller (i.e., the outer layer), even if the tension continues to increase, the pressure between adjacent films in the middle and outer layers is still much lower than that in the inner layer, and there will be no excessive seepage of adhesive. The phenomenon of interlayer adhesion occurs in the micropores. The specific winding process is as follows: After being processed by components such as pre-traction, correction and unfolding (not shown in the figure), the film passes under the active tension roller 3 located at the lower position, then passes over the upper side of the first driven tension roller 31, and finally enters between the pressure roller 22 and the winding roller 12. Under the combined squeezing of the pressure roller 22 and the winding roller 12, it is continuously wound up with the rotation of the winding roller 12. As the roll diameter increases, the pressure roller 22 and related components such as the floating support 2 are pushed upward, and the first driven tension roller 31 moves upward synchronously, while the active tension roller 3 remains at the lower position. Under this setting, the height difference between the first driven tension roller 31 and the active tension roller 3 in the vertical direction becomes larger. The increase in height difference causes the wrap angle of the film to increase, the friction to rise, and thus the traction resistance to increase, resulting in the winding tension increasing with the increase of the roll diameter.

[0065] When the film to be wound is a solid film without micropores, coatings, or adhesive, taking a typical dense PTFE film as an example, there is no risk of adjacent films sticking together or micropores collapsing. However, the surface friction coefficient of PTFE film is still relatively low compared to ordinary non-PTFE films. Therefore, a film winding path with the active tension roller 3 located at the upper position is adopted. Under this winding path, the initial tension is high, which restricts the axial movement between adjacent films in the inner layer. Subsequently, as the roll diameter increases, the tension gradually decreases, reducing the continuous squeezing force of the outer film on the inner layer and avoiding the accumulation of a large amount of residual stress in the entire roll, which would cause the roll to deform during storage. The specific winding process is as follows: after being processed by components such as pre-traction, correction, and unfolding (not shown in the figure), the film is wound around the upper position. The film passes over the upper side of the active tension roller 32, then around the lower side of the second driven tension roller 32, and finally enters between the pressure roller 22 and the take-up roller 12. Under the combined pressure of the pressure roller 22 and the take-up roller 12, the film is continuously wound up as the take-up roller 12 rotates. As the roll diameter increases, the pressure roller 22 and related components such as the floating support 2 are pushed upward, and the second driven tension roller 32 moves upward synchronously, while the active tension roller 3 remains in the upper position. This setting reduces the height difference between the second driven tension roller 32 and the active tension roller 3 in the vertical direction. This reduction in height difference reduces the wrap angle of the film between the active tension roller 3 and the second driven tension roller 32, shortens the contact arc length between the film and the roller surface, reduces the friction, and decreases the traction resistance of the film, resulting in a gradual decrease in winding tension as the roll diameter increases.

[0066] Specifically, such as Figure 1 , 4 As shown, a height adjustment component 13 connected to the frame 11 is provided on the base 1. The height adjustment component 13 is adapted to drive the frame 11 to move linearly in the vertical direction.

[0067] In this embodiment, the height adjustment component 13 is a drive cylinder, and the extension end of the drive cylinder is connected to the frame 11, thereby driving the frame 11 to move linearly in the vertical direction.

[0068] In this embodiment, before the winding operation begins, the frame 11 can be moved down by the drive cylinder to change the pre-pressure generated on the film by the pressure roller 22 in conjunction with the winding roller 12.

[0069] Specifically, such as Figure 1 As shown, the take-up roll 12 includes an air shaft 14 and a paper roll 15, with the air shaft 14 located inside the paper roll 15 to support it.

[0070] In this embodiment, the paper roll 15 can be sleeved outside the air expansion shaft 14. The air expansion shaft 14 is existing technology. After air is introduced, it can support the paper roll 15 from the inside. The paper roll 15 is connected to the end of the film. The specific connection method can adopt common technical means such as adhesive.

[0071] Specifically, such as Figure 5 As shown, the winding base includes a fixed base 16 and a movable base 17. A winding motor is installed on the fixed base 16. A rotating seat 18 is installed on both the fixed base 16 and the movable base 17. A docking block is installed on the rotating seat 18. A docking groove that mates with the docking block is opened on the air shaft 14. The rotating seat 18 installed on the fixed base 16 is coaxially connected to the output end of the winding motor. A first electrically controlled slide rail 111 is installed on the base 1. The movable end of the first electrically controlled slide rail 111 is connected to the movable base 17 to drive the movable base 17 to move linearly along the axial direction of the winding roller 12.

[0072] In this embodiment, the movable base 17 is moved away from the fixed base 16 by the first electrically controlled slide rail 111 to increase the distance between the movable base 17 and the fixed base 16. The air shaft 14 is placed between the two, and the docking groove corresponding to the end of the air shaft 14 closest to the fixed base 16 is docked with the corresponding docking block. Then, the movable base 17 is moved to dock with the docking block on it and the docking groove at the other end of the air shaft 14 to complete the installation of the take-up roller 12. When the take-up roller 12 needs to rotate, the take-up motor is started. Of course, other installation methods for the take-up roller 12 can also be used to fix the take-up roller 12 and drive it to rotate.

[0073] like Figure 1 , 2 As shown, a position adjustment mechanism is provided on the base 1. The position adjustment mechanism is connected to the movable seat 33 to drive the movable seat 33 to move in the vertical direction, thereby driving the active tension roller 3 to move.

[0074] In this embodiment, the position adjustment mechanism can drive the active tension roller 3 to switch between the upper and lower positions. It should be noted that the specific positions of the upper and lower positions are not fixed. For example, when the active tension roller 3 is in the lower position, the active tension roller 3 is located below the first driven tension roller 31 in the vertical direction. The position adjustment mechanism can be used to adjust the initial height difference between the first driven tension roller 31 and the active tension roller 3 before the winding operation begins, thereby adjusting the initial tension. The same applies when the active tension roller 3 is in the upper position.

[0075] Specifically, such as Figure 4 As shown, the position adjustment mechanism includes a first lead screw and nut pair and an adjustment motor 19 mounted on the base 1. The first lead screw and nut pair includes a first threaded rod 110 rotatably mounted on the base 1 and a first nut connected to the first threaded rod 110. The movable seat 33 is mounted on the first nut. The output end of the adjustment motor 19 is connected to the first threaded rod 110, thereby driving the first threaded rod 110 to rotate, thereby driving the movable seat 33 and the active tension roller 3 to move linearly along the axial direction of the first threaded rod 110.

[0076] Example 2: Figure 6-8 As shown, this embodiment further includes the following structure based on embodiment one: two adjustment brackets 21 are provided, the pressure roller 22 includes a replacement roller 25 and a docking roller 24 rotatably mounted on the corresponding adjustment bracket 21, a replacement station 26 is provided between the two docking rollers 24, the replacement roller 25 is located at the replacement station 26, the replacement station 26 is suitable for placing any specified length of replacement roller 25, and the two docking rollers 24 are suitable for being moved to dock with the replacement roller 25 located in the replacement station 26 to form a complete pressure roller 22, so that the length of the pressure roller 22 is adapted to the width of the film;

[0077] Two adjusting brackets 21 are slidably mounted on the floating bracket 2 along the axial direction of the pressure roller 22. The two adjusting brackets 21 are adapted to be moved to move towards or away from each other, thereby driving the corresponding docking rollers 24 to move towards or away from each other. When the two docking rollers 24 are moved towards each other, the two docking rollers 24 dock with the replacement roller 25 located at the replacement station 26.

[0078] A baffle 4 is vertically slidable downward inside the adjusting bracket 21. A second elastic element 41 is provided between the baffle 4 and the adjusting bracket 21. The baffle 4 is adapted to extend partially out of the corresponding adjusting bracket 21 and abut against the outer wall of the take-up roller 12. The two baffles 4 constrain the two axial positions of the film on the take-up roller 12.

[0079] In this embodiment, when the diameter of the film roll on the take-up roller 12 increases, the adjusting bracket 21 is moved upward, and the baffle 4 is always pressed against the outer wall surface of the take-up roller 12 under the action of the second elastic member 41, so as to constrain the two axial positions of the film roll on the take-up roller 12.

[0080] In this embodiment, the pressure roller 22 adopts a segmented splicing structure, and the length of the docking roller 24 is fixed. Only the replacement roller 25 of the corresponding length needs to be replaced according to the actual width of the film. When replacing, the replacement roller 25 is placed in the replacement station 26 between the two docking rollers 24. The adjustment brackets on both sides move towards each other, driving the docking roller 24 to dock with the replacement roller 25, so that a complete pressure roller 22 matching the width of the film can be obtained. When the adjustment bracket 21 is axially adjusted, the baffle 4 inside it is axially positioned simultaneously, located on both sides of the selected width of film. Under the action of the second elastic member 41, the baffle 4 partially extends out of the adjustment bracket 21 and abuts against the take-up roller 12. This limits the end face of the film roll formed after the selected width film is wound up, preventing the formation of a severe tower-shaped end face and improving the flatness of the end face. As the roll diameter gradually increases during winding, the adjusting bracket 21 is moved upward. Under the action of the second elastic element 41, the baffle 4 extends continuously beyond the adjusting bracket 21 and always remains in contact with the winding roller. Under this setting, when switching the target finished product roll diameter during continuous production without stopping the machine, the adjusting bracket 21 rises and falls synchronously with the change of the outer diameter of the roll film. The baffle 4 automatically adjusts its extension length by relying on the second elastic element 41, continuously limiting the axial end face of the roll film without the need for manual machine stoppage to adjust the baffle limiting range.

[0081] It should be noted that the replacement roller 25 can be replaced manually or automatically, as long as the docking roller 24 and the replacement roller 25 are docked.

[0082] Specifically, such as Figure 8 As shown, a docking adjustment mechanism is provided on the floating support 2. The docking adjustment mechanism includes a docking motor 28 mounted on the floating support 2 and a first bidirectional screw 27 rotatably mounted on the floating support 2. The first bidirectional screw 27 is provided with two oppositely arranged threads, and a first mating nut is connected to each of the two oppositely arranged threads. The adjustment bracket 21 is mounted on the corresponding first mating nut. The output end of the docking motor 28 is coaxially connected to the first bidirectional screw 27 to drive the first bidirectional screw 27 to rotate, thereby driving the two adjustment brackets 21 to move towards or away from each other along the axial direction of the first bidirectional screw 27.

[0083] Specifically, such as Figure 9 As shown, after the baffle 4 extends, it can abut against the outer surface of the paper roll 15. In this case, the length of the paper roll 15 is greater than the width of the film to be wound.

[0084] Specifically, such as Figure 7 As shown, the docking roller 24 has a groove 29, and the corresponding adjustment bracket 21 has an extension plate 210. The docking roller 24 is rotatably mounted on the corresponding extension plate 210 through the bottom wall of the groove 29.

[0085] like Figure 10As shown, the baffle 4 includes a lower end portion 42 and a side portion 43. The lower end portion 42 abuts against the take-up roller 12. The lower end portion 42 is arc-shaped, and the arc matches the arc of the corresponding take-up roller 12.

[0086] The side portion 43 is adapted to constrain the axial position of the film on the take-up roller 12.

[0087] In this embodiment, the roll diameter expands continuously from small to large, the outer periphery of the roll film is a continuous arc surface, and the lower end 42 adopts an arc shape that matches the curvature of the take-up roller 12, so that the limiting area of ​​the film after the baffle 4 abuts against the take-up roller 12 is increased. The side part 43 corresponds to the axial end face of the roll film on the take-up roller 12, and is used to limit the flatness of the end face.

[0088] like Figure 10 As shown, multiple contact rollers 44 are rotatably mounted at the lower end 42 of the baffle 4, and the multiple contact rollers 44 are arranged along the arc of the lower end 42.

[0089] In this embodiment, a contact roller 44 is provided on the lower end 42 that abuts against the take-up roller 12. By abutting against the take-up roller 12 through the contact roller 44, when the take-up operation is in progress, the surface friction between the take-up roller 12 and the lower end 42 is converted into rolling friction between the take-up roller 12 and the contact roller 44, which can reduce the wear of the take-up roller 12 and the lower end 42 of the baffle 4.

[0090] like Figure 11 As shown, a reset assembly is provided on the adjusting bracket 21. The reset assembly includes:

[0091] A movable plate 45 is mounted on the baffle 4;

[0092] A push plate 46 is vertically slidably mounted on the adjusting bracket 21. The push plate 46 has an upper working position and a lower working position.

[0093] A reset drive component is mounted on the adjusting bracket 21. This reset drive component is connected to the push plate 46 to move the push plate 46 to either the upper or lower work position.

[0094] When the push plate 46 is located at the lower station, the push plate 46 is adapted to limit the maximum stroke of the baffle 4 extending out of the adjusting bracket 21 through the second elastic member 41. When the push plate 46 is located at the maximum stroke of the adjusting bracket 21, the push plate 46 located at the lower station abuts against the moving plate 45.

[0095] When the push plate 46 is moved from the lower station to the upper station, the push plate 46 is adapted to contact the moving plate 45 and drive the moving plate 45 to move to the upper station, so that the baffle 4 is completely inserted into the corresponding adjusting bracket 21.

[0096] In this embodiment, when the winding operation has not started, the push plate 46 is located at the upper station (i.e., the initial position). By restricting the movement of the moving plate 45, the baffle 4 is confined within the adjustment bracket 21. When the winding operation starts, the reset drive component moves the push plate 46 from the upper station to the lower station. The baffle 4 is no longer restricted and extends out of the adjustment bracket 21 through the second elastic member 41, abutting against the winding roller 12. As the film roll diameter increases, it gradually extends out of the adjustment bracket 21. At this time, the push plate 46 located at the lower station is used to restrict the extension of the baffle 4. When the baffle 4 extends to the maximum stroke, and the moving plate 45 abuts against the push plate 46 located at the lower station, the baffle 4 cannot extend further. After the winding work is completed, the reset drive unit starts and drives the push plate 46 from the lower station to the upper station. When the push plate 46 moves, it drives the moving plate 45 to move to the upper station. When the push plate 46 is at the upper station, the baffle 4 is fully retracted into the adjusting bracket 21. After the reset drive unit stops working, the push plate 46 stays at the upper station, so that the baffle 4 stays in the adjusting bracket 21 before the next winding station begins.

[0097] Specifically, such as Figure 11 As shown, the reset drive component includes a reset motor 48 and a reset screw and nut assembly. The reset screw and nut assembly includes a reset threaded rod 47 rotatably mounted on the adjusting bracket 21 and a reset nut mating with the reset threaded rod 47. A push plate 46 is mounted on the reset nut. The reset motor 48 is mounted on the adjusting bracket 21. The output end of the reset motor 48 is coaxially connected to the reset threaded rod 47 to drive the reset threaded rod 47 to rotate, thereby driving the push plate 46 to move linearly along the axis of the reset threaded rod 47.

[0098] Example 3: Figure 12-14 As shown, the polytetrafluoroethylene film winding device also includes a replacement assembly, which includes:

[0099] The second electrically controlled slide rail 5 is provided on one side of the base 1. The sliding base 51 is provided on the moving end of the second electrically controlled slide rail 5. The second electrically controlled slide rail 5 is adapted to drive the sliding base 51 to move longitudinally in the horizontal direction.

[0100] A movable bracket 52 is slidably disposed on a sliding base 51 in the horizontal direction. A placement plate 53 for receiving a replacement roller 25 is provided on the movable bracket 52. The movable bracket 52 is adapted to be moved so that the replacement roller 25 on the movable bracket 52 is located at the replacement station 26.

[0101] Two pairs of center plates 54 are slidably disposed on the sliding base 51 along the axial direction of the take-up roller 12. The two pairs of center plates 54 are symmetrically arranged and located on both sides of the placement plate 53. The two pairs of center plates 54 are adapted to be moved in opposite directions to push the replacement roller 25 located on the placement plate 53 to the center position of the placement plate 53.

[0102] In this embodiment, before the winding operation begins, the frame 11 is moved so that the replacement station 26 between the two docking rollers 24 is moved to a height that matches the placement plate 53. The replacement roller 25 of the required specifications is placed on the placement plate 53. The second electrically controlled slide rail 5 is activated to move the sliding base 51 from one side of the base 1 to directly above the base 1, so that the placement plate 53 is in front of the replacement station 26. The two centering plates 54 are moved towards each other to push the replacement roller 25 on the placement plate 53 to move until the center of the replacement roller 25 is aligned with the center of the placement plate 53. The moving bracket 52 is moved towards the docking roller 24 until the replacement roller 25 on the placement plate 53 is at the replacement work position. The two adjusting brackets 21 are moved towards each other until the corresponding docking roller 24 contacts and docks with the replacement roller 25 at the replacement station 26. The frame 11 is then moved upward to remove the docked replacement roller 25 from the receiving range of the placement plate 53. Finally, the moving bracket 52 and the sliding base 51 are reset.

[0103] Specifically, such as Figure 12-14 As shown, a moving motor 55 is mounted on the sliding base 51, and a second lead screw and nut assembly is provided on the sliding base 51. The second lead screw and nut assembly includes a second threaded rod 56 rotatably mounted on the sliding base 51 and a second nut that is fitted onto the second threaded rod 56. A moving bracket 52 is mounted on the second nut. The output end of the moving motor 55 is coaxially connected to the second threaded rod 56 to drive the second threaded rod 56 to rotate, thereby driving the moving bracket 52 to move linearly in the axial direction of the second threaded rod 56.

[0104] Specifically, such as Figure 14 As shown, a centering motor 57 is provided on the sliding base 51, and a second bidirectional screw 58 is rotatably mounted on the sliding base 51. The second bidirectional screw 58 is provided with two oppositely arranged threads, and a second mating nut is connected to each of the two threads. The centering plate 54 is installed on the corresponding second mating nut. The output end of the centering motor 57 is coaxially connected to the second bidirectional screw 58 to drive the second bidirectional screw 58 to rotate, thereby driving the two pairs of centering plates 54 to move towards or away from each other along the axial direction of the second bidirectional screw 58.

[0105] Specifically, such as Figure 15 As shown, the replacement roller 25 is provided with a first magnetic attraction part 6, and the docking roller 24 is provided with a magnetic attraction groove, and a second magnetic attraction part 61 that cooperates with the first magnetic attraction part 6 is provided in the magnetic attraction groove.

[0106] In this embodiment, when the docking roller 24 is moved towards the replacement roller 25, the first magnetic suction part 6 is inserted into the magnetic suction groove and attracts the second magnetic suction part 61, thereby realizing the docking of the replacement roller 25 and the docking roller 24.

[0107] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A polytetrafluoroethylene film winding device, characterized in that... ,include: A base, on which a frame is mounted, the frame being adapted to be moved vertically; A winding assembly, comprising a winding base disposed on the base and a winding roller rotatably disposed on the winding base for winding a film into a roll; An extrusion assembly, comprising a floating support slidably disposed vertically on the frame and an adjusting support disposed on the floating support, and a pressure roller rotatably disposed on the adjusting support and adapted to press a film on a receiving roll, wherein a first elastic element is disposed between the floating support and the frame; A tension adjustment assembly includes an active tension roller, a first driven tension roller, and a second driven tension roller. A movable seat is slidably disposed vertically on the base. The active tension roller is rotatably mounted on the movable seat. The first and second driven tension rollers are symmetrically arranged vertically and rotatably mounted on a floating support. The second driven tension roller is located above the first driven tension roller. When the take-up roller is actuated to rotate and take up the film, the film roll diameter on the take-up roller gradually increases, and the floating support moves upward through the pressure roller. Furthermore, the floating support drives the first and second driven tension rollers to move upward synchronously. During its movement, the active tension roller has an upper position in the vertical direction that is higher than the second driven tension roller and a lower position in the vertical direction that is lower than the first driven tension roller; When the active tension roller is in the upper position, the film passes sequentially around the upper side of the active tension roller, the lower side of the second driven tension roller, and between the pressure roller and the take-up roller; When the active tension roller is in the lower position, the film passes sequentially around the lower side of the active tension roller, the upper side of the first driven tension roller, and between the pressure roller and the take-up roller.

2. The polytetrafluoroethylene film winding device according to claim 1, characterized in that: The base is provided with a height adjustment component connected to the frame, which is adapted to drive the frame to move linearly in the vertical direction.

3. The polytetrafluoroethylene film winding device according to claim 1, characterized in that: The base is provided with a position adjustment mechanism, which is connected to the movable seat to drive the movable seat to move in the vertical direction, thereby driving the active tension roller to move.

4. The polytetrafluoroethylene film winding device according to claim 1, characterized in that: The adjustment bracket is provided in two parts. The pressure roller includes a replacement roller and a docking roller rotatably mounted on the corresponding adjustment bracket. A replacement station is provided between the two docking rollers. The replacement roller is located at the replacement station. The replacement station is suitable for placing any specified length of the replacement roller. The two docking rollers are suitable for being moved to dock with the replacement roller located at the replacement station to form a complete pressure roller, so that the length of the pressure roller is adapted to the width of the film. The two adjusting brackets are slidably disposed on the floating bracket along the axial direction of the pressure roller. The two adjusting brackets are adapted to be moved to move towards or away from each other, thereby driving the corresponding docking rollers to move towards or away from each other. When the two docking rollers are moved towards each other, the two docking rollers dock with the replacement roller located at the changing station. A baffle is vertically slidable downward inside the adjusting bracket. A second elastic element is provided between the baffle and the adjusting bracket. The baffle is adapted to extend partially out of the corresponding adjusting bracket and abut against the outer wall surface of the take-up roller. The two baffles constrain the two axial positions of the film on the take-up roller.

5. The polytetrafluoroethylene film winding device according to claim 4, characterized in that: The floating support is provided with a docking adjustment mechanism, which includes a docking motor mounted on the floating support and a first bidirectional screw rotatably mounted on the floating support. The first bidirectional screw has two oppositely arranged threads, and a first mating nut is connected to each of the two oppositely arranged threads. The adjustment bracket is mounted on the corresponding first mating nut. The output end of the docking motor is coaxially connected to the first bidirectional screw to drive the first bidirectional screw to rotate, thereby driving the two adjustment brackets to move towards or away from each other along the axial direction of the first bidirectional screw.

6. The polytetrafluoroethylene film winding device according to claim 4, characterized in that: The docking roller has a groove, and an extension plate is provided on the corresponding adjustment bracket. The docking roller is rotatably mounted on the corresponding extension plate through the bottom wall of the groove.

7. The polytetrafluoroethylene film winding device according to claim 4, characterized in that: The baffle includes a lower end and a side end. The lower end abuts against the take-up roller. The lower end is arc-shaped, and the arc matches the arc of the corresponding take-up roller. The side portion is adapted to constrain the axial position of the film on the take-up roller.

8. The polytetrafluoroethylene film winding device according to claim 7, characterized in that: Multiple contact rollers are rotatably mounted at the lower end of the baffle, and the multiple contact rollers are arranged along the arc of the lower end.

9. The polytetrafluoroethylene film winding device according to claim 4, characterized in that: The adjusting bracket is provided with a reset assembly, which includes: A movable plate is mounted on the baffle; A push plate that is vertically slidable on the adjusting bracket, the push plate having an upper working position and a lower working position; A reset drive component is mounted on the adjusting bracket, and the reset drive component is connected to the push plate to move the push plate to either the upper or lower working position; wherein... When the push plate is located at the lower station, the push plate is adapted to limit the maximum stroke of the baffle extending out of the adjusting bracket through the second elastic element. When the push plate is located at the maximum stroke of the adjusting bracket, the push plate located at the lower station abuts against the moving plate. When the push plate is moved from the lower station to the upper station, the push plate is adapted to contact the moving plate and drive the moving plate to move to the upper station, so that the baffle is completely inserted into the corresponding adjustment bracket.

10. The polytetrafluoroethylene film winding device according to claim 9, characterized in that: The reset drive component includes a reset motor and a reset screw and nut assembly. The reset screw and nut assembly includes a reset threaded rod rotatably mounted on the adjusting bracket and a reset nut connected to the reset threaded rod. The push plate is mounted on the reset nut. The reset motor is mounted on the adjusting bracket. The output end of the reset motor is coaxially connected to the reset threaded rod to drive the reset threaded rod to rotate, thereby driving the push plate to move linearly along the axis of the reset threaded rod.

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