Plastic film winding device
By designing a press roller using wire rope and counterweight weights in the plastic film coiling device, a constant radial force is achieved, which solves the problem of air and friction wear of the film coiling, and improves the winding quality and film material protection effect.
Patent Information
- Application Number
- CN202421303605.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-06-07
Smart Images
Figure CN222573805U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of plastic production equipment, and in particular relates to a plastic film winding device. Background Art
[0002] Plastic film winding devices can be divided into intermittent winding and contact winding. Contact winding uses the contact roller to press on the surface of the film roll and provide friction to drive the film roll to rotate to achieve winding; while intermittent winding mainly uses the power of the winding shaft's rotation to achieve winding. The upstream guide roller of the intermittent winding needs to be close to the film roll, but cannot touch the film roll. The upstream guide roller is generally located diagonally above the film roll.
[0003] The advantage of intermittent winding is that it can prevent friction and wear between the film material and the contact roller, and avoid damage and scratches on the surface of the film material. Plastic films that use intermittent winding are generally delicate and easily damaged. The disadvantage of intermittent winding is that the film roll is easy to be drawn into the air, affecting the film roll density and other winding quality indicators. In order to eliminate the air drawn into the film roll, people generally use a pressure roller to press on the film roll. Since the diameter of the film roll increases from small to large during the winding process, the pressure roller needs to be installed on a swingable swing arm so that the pressure roller will continuously shift as the diameter of the film roll increases.
[0004] The above existing structure still has the following deficiencies: First, the weight of the pressure roller itself will press on the surface of the film roll, and the pressure value is large, which means that the friction force is large, and the risk of friction and wear is high; Second, the force of the pressure roller pressing on the surface of the film roll can be decomposed into tangential force and radial force (tangential and radial refer to the tangential and radial directions of the film roll), and the direction of the effective force to drive away the air is the radial force; during the winding process, as the diameter of the film roll continues to increase and the swing arm gradually swings, the direction of the force of the pressure roller squeezing on the film roll continues to change, causing the radial force (effective force) to change continuously, and because the minimum and maximum values of the film roll diameter differ greatly, it means that the direction of the force of the pressure roller pressing on the surface of the film roll changes greatly, and the radial force fluctuates greatly; Furthermore, if the radial force is too small, it is not enough to effectively drive away the air; on the contrary, if the force is too large, the risk of wear on the surface of the plastic film is unreasonably increased. Utility Model Content
[0005] The utility model aims to overcome the above disadvantages and provide a plastic film winding device, the pressure roller of which can provide a constant radial force and avoid abrasion of the film material.
[0006] Its purpose can be achieved according to the following scheme: a plastic film winding device comprises a winding shaft, the extension direction of the winding shaft is horizontal, and an upstream guide roller for the film to pass around is also provided next to the winding shaft; a pressure roller is also provided behind the winding shaft, characterized in that the central axis of the pressure roller is located directly behind the central axis of the winding shaft; the two ends of the pressure roller are respectively mounted on pressure roller support plates, and the pressure roller support plates on each side can be slidably mounted on a longitudinal guide rail extending longitudinally; a first fixed pulley, a second fixed pulley, and a steel wire rope are also provided next to each longitudinal guide rail, the first fixed pulley is located in front of the second fixed pulley, the steel wire rope passes around the first fixed pulley and the second fixed pulley, the first end of the steel wire rope is connected to the pressure roller support plate, the connection point of the two is located in front of the second fixed pulley and behind the first fixed pulley, and a counterweight is hung on the second end of the steel wire rope.
[0007] The utility model has the following advantages and effects:
[0008] First, the central axis of the pressure roller is located directly in front of the central axis of the winding shaft, so the weight of the pressure roller itself will not press on the film roll at all; on the other hand, the weight of the weight is transmitted to both ends of the pressure roller through the wire rope and the pressure roller support plate, so that the pressure roller is lightly pressed on the film roll, and the direction of the pressure is just the radial direction of the film roll, and it is always radial. The radial pressure (the effective pressure to drive away the air) is always kept equal to the weight of the weight, that is, the pressure is kept small and constant, which is sufficient to exclude the air involved in the film roll and avoid wear of the film material due to the small pressure; furthermore, the weight of the weight can be increased or decreased according to the needs of the film material.
[0009] Second, the installation position of the pressure roller is relatively far away from the upstream guide roller, and the two will not be crowded due to the close distance. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a side structural schematic diagram of a specific embodiment of the utility model when it starts to be rolled up.
[0011] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the embodiment shown.
[0012] Figure 3 yes Figure 1 The illustrated embodiment is a schematic diagram of the changing state when the winding is nearly completed. DETAILED DESCRIPTION
[0013] Figure 1 , Figure 2A plastic film winding device shown in the figure comprises a winding shaft 3, the extension direction of the winding shaft 3 is horizontal, and an upstream guide roller 4 for a film 80 to pass around is provided next to the winding shaft 3; a pressure roller 5 is provided behind the winding shaft 3, and the central axis of the pressure roller 5 is located directly behind the central axis of the winding shaft 3; the two ends of the pressure roller 5 are respectively mounted on a pressure roller support plate 6, and the pressure roller support plate 6 on each side can be slidably mounted on a longitudinal guide rail 7 extending longitudinally; a first fixed pulley 1, a second fixed pulley 2, and a steel wire rope 9 are provided next to each longitudinal guide rail 7, the first fixed pulley 1 is located in front of the second fixed pulley 2, and the steel wire rope 9 passes around the first fixed pulley 1 and the second fixed pulley 2; the first end of the steel wire rope 9 is connected to the pressure roller support plate 6, and the connection point 90 of the two is located in front of the second fixed pulley 2 and behind the first fixed pulley 1; a counterweight 10 is hung on the second end of the steel wire rope 9.
[0014] The usage principle of the above embodiment is as follows:
[0015] During the winding process, the film 80 passes over the upstream guide roller 4 and is wound onto the film roll 8 of the winding shaft 3. The weight of the weight 10 is converted into the tension of the wire rope 9. The wire rope 9 applies a forward tension to the pressure roller 5 through the connection point 90, so that the pressure roller 5 applies a forward pressure to the film roll 8 in the direction of Figure 3 As shown by the arrow F in the middle, the pressure is constant and equal to the weight of the weight 10. During the winding process, as the diameter of the film roll 8 increases, the pressure roller 5 automatically retreats, and the pressure roller support plate 6 retreats along the longitudinal guide rail 7. Figure 1 The state shown evolves to Figure 3 Status shown.
Claims
1. A plastic film winding device, comprising a winding shaft, the winding shaft extending in a horizontal direction, an upstream guide roller for the film to pass around is arranged beside the winding shaft; a pressure roller is arranged behind the winding shaft, characterized in that: The central axis of the pressure roller is located directly behind the central axis of the winding shaft; the two ends of the pressure roller are respectively mounted on the pressure roller support plates, and the pressure roller support plates on each side can be slidably mounted on a longitudinal guide rail extending longitudinally; a first fixed pulley, a second fixed pulley, and a steel wire rope are also provided next to each longitudinal guide rail, the first fixed pulley is located in front of the second fixed pulley, and the steel wire rope passes around the first fixed pulley and the second fixed pulley; the first end of the steel wire rope is connected to the pressure roller support plate, and the connection point of the two is located in front of the second fixed pulley and behind the first fixed pulley; a counterweight is hung on the second end of the steel wire rope.