Bidirectional film stretching device
By designing a film bidirectional stretching device, the angles of the guide rail and rotary arm are adjusted by adjusting the inclusion of polypropylene films in different proportions, the problem of differences in film dielectric and energy storage performance in the prior art is solved, and the ability to regulate film performance is improved.
Patent Information
- Application Number
- CN202422060454.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-24
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-24
AI Technical Summary
In the prior art, the proportions of the polypropylene films being elongated in the horizontal and vertical directions are different, the dielectric and energy storage properties are different, and there is a lack of effective stretching devices for regulation.
A thin film bidirectional stretching device is designed, including a circular base, central column, guide rail, rotary arm and slider structure. The slider is driven to move through the power device, and the rotary arm adjusts the angle to achieve horizontal and vertical stretching of different proportions.
The polypropylene film is stretched in different proportions in the horizontal and vertical directions, and its dielectric and energy storage performance is regulated, which improves the performance consistency of the film.
Smart Images
Figure CN223071936U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of film manufacturing equipment, in particular to a film biaxial stretching device. Background Art
[0002] A metallized film capacitor is a capacitor made by using an organic plastic film as a dielectric, evaporating a metal layer on one side of the film as an electrode, and winding it. Commonly used films for metallized film capacitors include polypropylene and polycarbonate, etc. Among them, the polypropylene film is made by biaxially stretching in the horizontal and vertical directions. When the stretching ratios in the horizontal and vertical directions are different, the dielectric and energy storage properties of the polypropylene film will also be different. In order to study the influence of different stretching ratios in the horizontal and vertical directions on the dielectric and energy storage properties of the polypropylene film, the present application provides a film biaxial stretching device, which can stretch the polypropylene film at different stretching ratios in the horizontal and vertical directions in different stretching tests. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a film biaxial stretching device aiming at the above-mentioned existing technical deficiencies.
[0004] To solve the above technical problem, the technical solution adopted by the utility model is: a film biaxial stretching device, including a circular base, a central column coaxially arranged on the base, a first guide rail, a third guide rail, a second guide rail and a fourth guide rail which are radially arranged on the base and symmetrically distributed about the axis of the base, and second sliders are slidably connected to all of them. The second sliders on the first guide rail and the second guide rail are driven by a power device. The middle parts of the first rotating arm and the second rotating arm are rotatably connected to the central column, and first sliders are slidably connected to both sides of the two. The two ends of the first rotating arm and the second rotating arm are respectively located in the four gaps between the four guide rails. The middle part of the pushing plate is connected to the second slider, and guide grooves are arranged on both sides of the pushing plate. The first slider is located in the two adjacent guide grooves. Pressing plates for pressing the film are arranged on the tops of the first slider and the second slider. Fixing devices for fixing their positions are arranged on the first rotating arm and the second rotating arm.
[0005] Further optimizing the technical solution, the power device includes a motor, the rotating shaft of the motor is connected with a screw rod, the screw rod is rotatably connected to the first guide rail or the second guide rail, and screw holes matched with the screw rod are arranged on the second sliders on the first guide rail and the second guide rail.
[0006] Further optimizing the technical solution, the four pushing plates are also respectively slidably connected to the first guide rail, the third guide rail, the second guide rail and the fourth guide rail.
[0007] To further optimize this technical solution, the fixing device includes vertical arms respectively arranged at both ends of the first rotating arm and the second rotating arm. A through first threaded hole is provided at the lower end of the vertical arm, and the positioning bolt is threadedly connected to the first threaded hole so that it can press against the outer circumferential surface of the base to fix the positions of the first rotating arm and the second rotating arm.
[0008] To further optimize this technical solution, a cylindrical portion is provided in the middle of the first slider, and the cylindrical portion is located in the guiding groove.
[0009] The utility model has the following advantages: There are four fixed guide rails and two rotating arms on the base. Second sliders are slidably connected to all four guide rails. The two sides of the two rotating arms are respectively located in four gaps between the four guide rails. First sliders are slidably connected to both sides of the two rotating arms. The middle of the pushing plate is connected to the second slider, and guiding grooves are provided on both sides thereof. The first slider is located in two adjacent guiding grooves. Pressing plates for pressing the film are provided at the tops of the first slider and the second slider. When the second sliders on the first guide rail and the second guide rail move outwards, they will drive the four first sliders and the other two second sliders to move outwards for stretching in the horizontal and vertical directions. The two rotating arms can rotate to adjust the included angle between them, and their positions can be fixed after the adjustment is completed, so that the polypropylene film can be stretched at different ratios of elongation in the horizontal and vertical directions in different tensile tests. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a schematic structural diagram of a film biaxial stretching device.
[0011] Figure 2 It is Figure 1 the enlarged view of part Ⅰ in
[0012] Figure 3 a schematic structural diagram of the base.
[0013] Figure 4 a schematic structural diagram of the first slider.
[0014] In the figure: 1. Base; 11. First guide rail; 12. Second guide rail; 13. Third guide rail; 14. Fourth guide rail; 15. Central column; 2. First rotating arm; 3. Second rotating arm; 31. Vertical arm; 32. First threaded hole; 4. Pushing plate; 41. Guiding groove; 5. Positioning bolt; 6. First slider; 61. Cylindrical portion; 7. Pressing plate; 8. Second slider. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] To make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present utility model. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concepts of the present utility model.
[0016] Specific embodiments: In combination with Figures 1-4As shown in the figure, a biaxial stretching device for a film includes a circular base 1. A central column 15 coaxial with the base 1 is provided on the base 1. Four guide rails, namely a first guide rail 11, a third guide rail 13, a second guide rail 12, and a fourth guide rail 14, which are symmetrically distributed about the axis of the base 1 in a radial manner, are successively arranged on the base 1. Second sliders 8 are slidably connected to all of the four guide rails. The straight lines where the extending directions of the four guide rails are located all pass through the axis of the base 1. The second sliders 8 on the first guide rail 11 and the second guide rail 12 are driven by a power device so that the two second sliders 8 can move along the first guide rail 11 and the second guide rail 12 respectively. The middle parts of a first rotating arm 2 and a second rotating arm 3 are rotatably connected to the central column 15, and first sliders 6 are slidably connected to both sides of the two. The two ends of the first rotating arm 2 and the second rotating arm 3 are respectively located in the four gaps between the four guide rails. The middle part of a pushing plate 4 is connected to the second slider 8, and guide grooves 41 are provided on both sides of the pushing plate 4. The extending directions of the four pushing plates 4 are respectively perpendicular to the four guide rails where they are located. The first slider 6 is located in the two adjacent guide grooves 41 and can slide along the two. Pressing plates 7 for pressing the film are provided on the tops of the first slider 6 and the second slider 8. Threaded holes can be provided on the tops of the first slider 6 and the second slider 8. A through hole is provided on one side of the pressing plate 7. A bolt passes through the through hole and is connected to the threaded hole so that the pressing plate 7 can press a part of the film on the top of the slider. Fixing devices for fixing their positions are provided on the first rotating arm 2 and the second rotating arm 3, so that the two will not be displaced. During use, the four corners of a rectangular polypropylene sheet (hot) are respectively fixed by the four first sliders 6, and the middle parts of the four sides of the polypropylene sheet are fixed by the four second sliders 8. When the second sliders 8 on the first guide rail 11 and the second guide rail 12 move outwards, they will drive the four first sliders 6 and the other two second sliders 8 to move outwards, performing stretching in both the horizontal and vertical directions. When one stretching test is completed and the elongation ratios in the horizontal and vertical directions need to be changed for the next stretching test, the included angle between the first rotating arm 2 and the second rotating arm 3 (the two are symmetric about the plane where the first guide rail 11 and the second guide rail 12 are located) can be changed. Let the extending direction of the first guide rail 11 be the horizontal direction, and the extending direction of the third guide rail 13 be the vertical direction. When the included angle between the first rotating arm 2 and the first guide rail 11 is 45°, the elongation ratios in the horizontal and vertical directions are the same. When the included angle between the first rotating arm 2 and the first guide rail 11 is less than 45° and greater than 0°, the elongation ratio in the horizontal direction is greater than the elongation ratio in the vertical direction. When the included angle between the first rotating arm 2 and the first guide rail 11 is greater than 45° and less than 90°, the elongation ratio in the horizontal direction is less than the elongation ratio in the vertical direction. Different included angles result in different elongation ratios in the horizontal and vertical directions.
[0017] The power device includes a motor, which is fixed on the outer side of the first guide rail 11 or the second guide rail 12. The rotating shaft of the motor is connected with a screw rod, and the screw rod is rotationally connected with the first guide rail 11 or the second guide rail 12. A threaded hole matching with the screw rod is arranged on the second slider 8 on the first guide rail 11 and the second guide rail 12. The two motors operate synchronously.
[0018] The four push plates 4 are also respectively slidably connected with the first guide rail 11, the third guide rail 13, the second guide rail 12 and the fourth guide rail 14, thereby improving the stability of the push plate 4 during the moving process and preventing it from tilting with respect to the guide rail.
[0019] The fixing device includes vertical arms 31 respectively arranged at both ends of the first rotating arm 2 and the second rotating arm 3. A through first threaded hole 32 is arranged at the lower end of the vertical arm 31. The positioning bolt 5 is threadedly connected with the first threaded hole 32 so that it can abut against the outer circumferential surface of the base 1 to fix the positions of the first rotating arm 2 and the second rotating arm 3. By loosening the positioning bolt 5, the included angle between the first rotating arm 2 and the second rotating arm 3 can be adjusted.
[0020] A cylindrical portion 61 is arranged in the middle of the first slider 6, and the cylindrical portion 61 is located in the guide groove 41. At this time, the width of the guide groove 41 can be set to be equal to the diameter of the cylindrical portion 61. When adjusting the included angle between the first rotating arm 2 and the second rotating arm 3, both sides of the cylindrical portion 61 can be in contact with both sides of the guide groove 41. It can also be set that the upper middle part of the first slider 6 is in the shape of a cuboid, and its upper middle part is rotationally connected with its lower part so that the upper middle part can rotate relative to its lower part.
[0021] It should be understood that the above specific embodiments of the present invention are only used for exemplary illustration or explanation of the principle of the present invention, and do not constitute a limitation to the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims or equivalent forms of such scope and boundaries.
Claims
1. A biaxial stretching device for a film, comprising a circular base (1), characterized in that: A central column (15) coaxial with the base (1) is provided on the base (1). First guide rails (11), third guide rails (13), second guide rails (12) and fourth guide rails (14) which are symmetrically distributed about the axis of the base (1) are sequentially arranged on the base (1) in a radial pattern, and second sliders (8) are slidably connected to all of them. The second sliders (8) on the first guide rails (11) and the second guide rails (12) are driven by a power device. The middle parts of the first swing arm (2) and the second swing arm (3) are rotatably connected to the central column (15), and first sliders (6) are slidably connected to both sides of the two. The two sides of the first swing arm (2) and the second swing arm (3) are respectively located in four gaps between the four guide rails. The middle part of the pushing plate (4) is connected to the second slider (8), and guide grooves (41) are provided on both sides of the pushing plate (4). The first slider (6) is located in two adjacent guide grooves (41). Pressing plates (7) for pressing the film are provided on the tops of the first slider (6) and the second slider (8). Fixing devices for fixing their positions are provided on the first swing arm (2) and the second swing arm (3).
2. The biaxial stretching device for thin films according to claim 1, wherein: The power device includes a motor. A screw rod is connected to the rotating shaft of the motor. The screw rod is rotatably connected to the first guide rail (11) or the second guide rail (12). A screw hole cooperating with the screw rod is provided on the second slider (8) on the first guide rail (11) and the second guide rail (12).
3. A biaxial stretching device for a film according to claim 1, characterized in that: The four pushing plates (4) are also respectively slidably connected to the first guide rail (11), the third guide rail (13), the second guide rail (12) and the fourth guide rail (14).
4. A biaxial stretching device for a thin film according to claim 1, characterized in that: The fixing device includes vertical arms (31) respectively arranged at both ends of the first swing arm (2) and the second swing arm (3). A through first threaded hole (32) is provided at the lower end of the vertical arm (31). A positioning bolt (5) is threadedly connected to the first threaded hole (32) so that it can press against the outer circumferential surface of the base (1) to fix the positions of the first swing arm (2) and the second swing arm (3).
5. A biaxial stretching device for a thin film according to any one of claims 1-4, characterized in that: A cylindrical portion (61) is provided in the middle of the first slider (6). The cylindrical portion (61) is located in the guide groove (41).