A film pulling device and winding apparatus

Abstract

This invention provides a film stretching device, comprising: a base adapted to be fixedly connected to the equipment containing the film; and a clamping device disposed opposite to both sides of the film and fixedly connected to the base. The clamping device includes: a fixed base fixedly connected to the base; a first roller shaft connected to the fixed base; a first clamping roller rotatably connected to the first roller shaft; a second roller shaft oscillatingly connected to the fixed base; a second clamping roller rotatably connected to the second roller shaft; and a driving device for clamping the first and second clamping rollers. When the first and second clamping rollers are clamped, the rotation axes of the second and first clamping rollers are parallel, and the film passes between the second and first clamping rollers. This device overcomes the problem in the prior art where the film is not easily flattened, causing production quality defects. This invention also provides a winding device with this film stretching device.

Description

Technical Field

[0001] This invention relates to the field of film production equipment technology, specifically to a film stretching device and a winding device. Background Technology

[0002] In the film production process, there are many steps that require the film to be flattened, especially during film winding. If the film is not fully flattened, wrinkles are very likely to occur. Current technology only places rollers under the film to support it when flattening is required. However, due to the gap between the rollers, the film will sag slightly due to its own weight, preventing the film from being fully flattened and ultimately affecting the production quality of the corresponding steps, such as causing wrinkles during winding. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the problem of production quality defects caused by the film not being able to be fully flattened in the prior art.

[0004] To solve the above-mentioned technical problems, this application provides a film stretching device, comprising:

[0005] The base is adapted to be fixedly connected to the device containing the film;

[0006] The clamping devices are disposed opposite to each other on both sides of the film and are fixedly connected to the base;

[0007] The clamping device includes:

[0008] Fixed base, which is fixedly connected to the base;

[0009] The first roller shaft is connected to the fixed base;

[0010] The first clamping roller is rotatably connected to the first roller shaft;

[0011] The second roller shaft forms a swing connection with the fixed base;

[0012] The second clamping roller is rotatably connected to the second roller shaft;

[0013] The driving device causes the first clamping roller and the second clamping roller to perform a clamping action; when the first clamping roller and the second clamping roller are clamped, the rotation axes of the second clamping roller and the first clamping roller are parallel, and the film passes between the second clamping roller and the first clamping roller.

[0014] Optionally, the film is a moving film. When viewed from a direction perpendicular to the film, the first roller shaft deflects toward the direction of the film's movement, so that when the first clamping roller and the second clamping roller clamp together, the rotation axis of the first clamping roller forms an angle with the direction of the film's movement.

[0015] Optionally, the deflection angle is less than 90° and greater than or equal to 70°.

[0016] Optionally, the fixing seat and the base are connected by fastening bolts, and at least one of the fixing seat and the base is provided with an arc-shaped hole; the fastening bolt passes through the arc-shaped hole, so that the relative angle between the fixing seat and the base is adjustable.

[0017] Optionally, an arc-shaped hole is provided on the fixed seat, and a sliding groove is provided on the base, with the fastening bolts passing through the sliding groove and the arc-shaped hole in sequence; the direction of the sliding groove is consistent with the relative orientation of the clamping device.

[0018] Optionally, the base includes:

[0019] Connecting block, suitable for fixed connection with the device containing the film;

[0020] The base plate is fixedly connected to the connecting block and is provided with a sliding groove that runs through both the front and back sides;

[0021] The clamping plate is set on the base plate and is parallel to the slide groove; the nuts of the fastening bolts are polygonal, and one edge of the fastening bolt nut is in contact with the side of the clamping plate.

[0022] Optionally, the first roller shaft is fixedly connected to the fixed base; the driving device is a push cylinder, which pushes the second roller shaft to swing so that the second clamping roller clamps towards the first clamping roller.

[0023] Optionally, a pin is inserted through the middle of the second roller shaft, and a through groove is provided on the fixed seat. The second roller shaft is located in the through groove, and the pin is rotatably connected to the two side walls of the through groove. The end of the second roller shaft away from the second clamping roller is pushed by a push cylinder.

[0024] Optionally, elongated holes are provided on both sides of the through groove, and the direction of the elongated holes is consistent with the pushing direction of the push cylinder. The pin is located in the elongated hole, and a positioning device for limiting the pin is provided in the elongated hole.

[0025] This application provides a winding device, including:

[0026] A roll, driven by a power unit, is suitable for rolling up film;

[0027] The film pulling device, as described above, is disposed on the movement path of the film and is located in front of the movement path relative to the roll.

[0028] By adopting the above technical solution, the present invention has the following technical effects:

[0029] 1. The film stretching device provided by this invention, by incorporating two clamping rollers, fixes the film between them, allowing it to move only by rotating the rollers and preventing slippage. The clamping action, driven by the drive device, increases the clamping force, thus increasing the resistance to roller rotation. Given the film's relatively light weight, it is difficult for it to rotate on its own unless pulled by downstream equipment. This resistance forces the film to overcome the rollers' resistance and rotate, resulting in displacement. Under this resistance, the stretched film is completely flattened and straightened, improving the production quality of subsequent processes. Furthermore, this device employs clamping devices on both sides of the film, rather than using two continuous rollers for clamping. This facilitates film installation, especially when the film needs to be stretched temporarily during production; the interrupted clamping device makes it much easier to clamp films for continuous production. On the other hand, the clamping rollers on both sides have less weight and therefore less inertia compared to continuous rollers. When the film needs to pull the rollers to rotate, the required driving force is not excessive, thus reducing energy loss due to excessive resistance and preventing the film from breaking due to excessive tension. Similarly, when the film needs to pause its movement, it will not be difficult to stop in time due to the large rotational inertia of the rollers. Additionally, the use of oscillating clamping is more suitable for film insertion than translational clamping. Only a small opening angle is needed to create a relatively large opening distance at the end of the roller, allowing the film to be inserted. A smaller opening angle means less time consumption, thereby improving operational efficiency.

[0030] 2. The film stretching device provided by the present invention causes the clamping roller to deflect toward the film, so that the clamping roller will generate a pulling and supporting effect toward the center of the film. In addition, during the movement of the film, the clamping roller, which is deflected outward relative to the direction of film movement, will generate an resistance force toward the outside of the film during the rolling process. This resistance force causes the film to generate a component of movement to both sides during the passing process, and finally the center of the film is also pulled and flattened.

[0031] 3. The film-pulling device provided by the present invention can always ensure that the fastening bolt is locked from the circumference by making one edge of the fastening bolt nut fit against the side of the clamping plate, without the need to use tools for holding, which facilitates the disassembly and assembly operation.

[0032] 4. The film stretching device provided by the present invention, by setting a positioning device and a corresponding elongated hole, can adjust the parallelism of the two shafts when the first clamping roller and the second clamping roller are clamped. As the usage time goes by, especially under the long-term clamping force, the first roller shaft or the second roller shaft may experience axial bending. At this time, the positioning device can be adjusted to restore the two shafts to parallelism, thereby extending the service life of the equipment.

[0033] 5. The winding equipment provided by the present invention, by employing the above-mentioned film stretching device, ensures that the film remains flat before winding, thereby avoiding the generation of winding wrinkles and improving the yield of film products. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0036] Figure 2 This is a schematic diagram of the connection structure between the clamping device and the base in Embodiment 1 of the present invention from a first perspective.

[0037] Figure 3 This is a schematic diagram of the connection structure between the clamping device and the base in Embodiment 1 of the present invention from a second perspective.

[0038] Figure 4 This is a schematic diagram of the clamping device of Embodiment 1 of the present invention from a first perspective;

[0039] Figure 5 This is a schematic diagram of the clamping device of Embodiment 1 of the present invention from a second perspective;

[0040] Figure 6 for Figure 5 A magnified view of part A;

[0041] Figure 7 This is a schematic diagram of the base structure of Embodiment 1 of the present invention.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1-Clamping device, 2-Base, 3-Base plate, 4-Slide groove, 5-Clamping plate, 6-Fasting bolt, 7-Fixing seat, 8-Adjusting bolt, 9-Locking nut, 10-Through groove, 11-Second clamping roller, 12-First clamping roller, 13-Arc-shaped hole, 14-Upright plate, 15-Connecting plate, 16-Support plate, 17-Cylinder body, 18-Cylinder rod, 19-Pushing cylinder, 20-Second roller shaft, 21-Elongated hole, 22-Pin shaft, 23-Connecting block. Detailed Implementation

[0044] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] It should be noted in the description of this invention that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] Example 1

[0049] This embodiment provides a film stretching device for flattening thin films.

[0050] In one implementation, such as Figures 1 to 7As shown, it includes a base 2 and a clamping device 1. The base 2 is adapted to be fixedly connected to the equipment containing the film. The clamping device 1 is disposed opposite to both sides of the film and is fixedly connected to the base 2. The clamping device 1 includes: a fixed seat 7, a first roller shaft, a first clamping roller 12, a second roller shaft 20, a second clamping roller 11, and a driving device. The fixed seat 7 is fixedly connected to the base 2. Specifically, in this embodiment, it includes a connecting plate 15 and a vertical plate 14, but the fixed seat 7 can be manufactured in other forms such as block parts. The first roller shaft is connected to the fixed seat 7. The first clamping roller 12 is rotatably connected to the first roller shaft. The second roller shaft 20 is oscillatingly connected to the fixed seat 7. The second clamping roller 11 is rotatably connected to the second roller shaft 20. Under the action of the driving device, the first clamping roller 12 and the second clamping roller 11 perform a clamping action. When the first clamping roller 12 and the second clamping roller 11 are clamped, the rotation axes of the second clamping roller 11 and the first clamping roller 12 are parallel. The film passes between the second clamping roller 11 and the first clamping roller 12.

[0051] It should be noted that the first roller and the second roller 20 can both swing and finally be clamped under the joint action of the drive device, or the first roller can be fixed while the second roller 20 swings, and the drive device only drives the second clamping roller 11 to move for clamping.

[0052] This device features two clamping rollers that hold the film in place. This ensures the film can only move by rotating the rollers, preventing slippage. The clamping force, driven by the drive mechanism, increases the resistance to the rollers' rotation. Given the film's relatively light weight, it cannot easily move the rollers on its own. Only when pulled by downstream equipment will the film overcome this resistance and move the rollers. Under this resistance, the stretched film is completely flattened and straightened, improving the quality of subsequent processes. Furthermore, this device employs clamping devices on both sides of the film, rather than using two continuous rollers for clamping. This facilitates film installation, especially when the film needs to be stretched temporarily during production; the interrupted clamping device makes it much easier to clamp films for continuous production. On the other hand, the clamping rollers on both sides have less weight and therefore less inertia compared to continuous rollers. When the film needs to pull the rollers to rotate, the required driving force is not excessive, thus reducing energy loss due to excessive resistance and preventing the film from breaking due to excessive tension. Similarly, when the film needs to pause its movement, it will not be difficult to stop in time due to the large rotational inertia of the rollers. Additionally, the use of oscillating clamping is more suitable for film insertion than translational clamping. Only a small opening angle is needed to create a relatively large opening distance at the end of the roller, allowing the film to be inserted. A smaller opening angle means less time consumption, thereby improving operational efficiency.

[0053] Based on the above embodiments, in an optional embodiment, the film is a moving film. Viewed from a direction perpendicular to the film, the rotation axis of the first roller, or first clamping roller 12, is deflected towards the direction of the film's movement, so that when the first clamping roller 12 and the second clamping roller 11 are clamped, an angle is formed between the rotation axis of the first clamping roller 12 and the direction of movement of the film. That is, Figure 2 To illustrate, assuming the film moves from the lower right to the upper left in the diagram, the clamping device 1 is first rotated clockwise during installation, causing the first clamping roller 12 to deflect towards the direction the film is coming from, i.e., the lower right in the diagram, thus forming an angle, before being fixed. This is because, relative to the rollers that are the entire width of the film, this device lacks sufficient support in the middle of the film. If the film is misaligned on both sides, the middle section is prone to collapse. By deflecting the clamping roller towards the direction the film is coming from, the clamping roller will generate a pulling support effect towards the middle of the film. Furthermore, during the movement of the film, the clamping roller, which is deflected outward relative to the direction of film movement, will generate an impedance component towards the outside of the film during rolling. This impedance force causes the film to move to both sides during its passage, ultimately causing the middle section of the film to be pulled and flattened.

[0054] Based on the above embodiments, in an optional embodiment, because the first clamping roller 12 is deflected towards the direction of the film's arrival, an angle is formed between the rotation axis of the first clamping roller 12 and the direction of the film's movement. This angle must be less than 90°, and preferably greater than or equal to 70°. The formed angle should not be too small; if it is too small, the clamping roller will be excessively pointed towards the direction of the film's arrival, causing its rolling direction to deviate too much from the direction of the film's movement, resulting in the clamping roller losing its rolling performance. The film will mainly rely on slippage to pass through the clamping roller, which will cause problems such as film tearing. An angle greater than or equal to 70° can effectively avoid the above problems.

[0055] Based on the above embodiments, in an optional embodiment, such as Figures 2 to 5 As shown, the fixed seat 7 and the base 2 are connected by fastening bolts 6. At least one of the fixed seat 7 and the base 2 is provided with an arc-shaped hole 13. The fastening bolts 6 pass through the arc-shaped hole 13, so that the relative angle between the fixed seat 7 and the base 2 is adjustable. That is, the two clamping rollers can swing to a certain extent relative to the length direction of the film, which facilitates the installation and adjustment of the clamping rollers.

[0056] Based on the above embodiments, in an optional embodiment, such as Figures 2 to 7 As shown, an arc-shaped hole 13 is provided on the fixed base 7, and a sliding groove 4 is provided on the base 2. The fastening bolt 6 passes through the sliding groove 4 and the arc-shaped hole 13 in sequence. The direction of the sliding groove 4 is consistent with the relative setting direction of the clamping device 1, that is, the direction of the sliding groove 4 is set along the width direction of the film. In this way, the clamping device 1 can be adjusted according to the width of the film, improving the adaptability of the device.

[0057] Based on the above embodiments, in an optional embodiment, such as Figure 7 As shown, the base 2 includes a connecting block 23, a base plate 3, and a retaining plate 5. The connecting block 23 is adapted to be fixedly connected to the device containing the film. The base plate 3 is fixedly connected to the connecting block 23 and is provided with a sliding groove 4 that runs through both sides. The retaining plate 5 is disposed on the base plate 3 and is arranged parallel to the sliding groove 4. Figure 3 As shown, the nut of the fastening bolt 6 is polygonal, such as an external hexagonal or square head, and one edge of the nut of the fastening bolt 6 is in contact with the side of the clamping plate 5. The operation of moving the fastening bolt along the slide groove 4 and tightening or loosening it involves both sides of the base 2. During the disassembly and assembly process, it is difficult for the human eye to simultaneously observe whether the disassembly and assembly tools on both sides are properly engaged. Therefore, after the base 2 is equipped with the clamping plate 5, and one edge of the nut of the fastening bolt 6 is in contact with it, it can always be ensured that the fastening bolt 6 is engaged from the circumference, eliminating the need for tools to hold it in place and facilitating the disassembly and assembly operation.

[0058] Based on the above embodiments, in an optional embodiment, such as Figure 4 As shown, the first roller shaft is fixedly connected to the fixed base 7; the driving device is a push cylinder 19, the cylinder body 17 of the push cylinder 19 is fixedly connected to the fixed base 7 through the support plate 16, and the cylinder rod 18 of the push cylinder 19 pushes the second roller shaft 20 to swing, so that the second clamping roller 11 clamps towards the first clamping roller 12. The push cylinder 19 can be either a hydraulic cylinder or a pneumatic cylinder, but a pneumatic cylinder is preferred because its clamping force is relatively moderate. This scheme, which uses the linear pushing motion of the push cylinder 19 to convert it into clamping motion, has the advantages of simple and compact structure compared to the scheme that uses a motor and gears to achieve rotational clamping. Moreover, the clamping force is easy to calculate based on the lever principle, which is beneficial for the structural design of the product according to specific conditions.

[0059] Based on the above embodiments, in an optional embodiment, such as Figure 4 As shown, a pin 22 is inserted through the middle of the second roller 20, and a through groove 10 is provided on the fixed seat 7. The second roller 20 is located in the through groove 10, and the pin 22 is rotatably connected to the two side walls of the through groove 10. The end of the second roller 20 away from the second clamping roller 11 is pushed by the push cylinder 19. This seesaw-like structure makes the clamping swing direction of the second roller 20 opposite to the force direction of the push cylinder 19. Therefore, the relatively slender push cylinder 19 and the first clamping roller 12 can be set at approximately the same horizontal position, making the entire clamping device 1 compact and reducing the space occupied.

[0060] Based on the above embodiments, in an optional embodiment, such as Figure 6As shown, elongated holes 21 are provided on both side walls of the through groove 10. The orientation of the elongated holes 21 is consistent with the pushing direction of the push cylinder 19, and the pin 22 is located inside the elongated holes 21. A positioning device for limiting the pin 22 is provided inside the elongated holes 21, such as a snap-fit ​​positioning device, but preferably a positioning device that limits the pin 22. Figure 6 As shown, a bolt hole leading to the elongated hole 21 is provided at one end of the vertical plate 14, and an adjusting bolt 8 is screwed in. The adjusting bolt 8 is aligned with the direction of the elongated hole 21. The pin shaft 22 is limited by adjusting the screw-in length of the adjusting bolt 8. A lock nut 9 can also be provided to prevent loosening. After this setting, the parallelism of the two shafts when the first clamping roller 12 and the second clamping roller 11 are clamped can be adjusted. As time goes by, especially under long-term clamping force, the first roller shaft or the second roller shaft 20 may experience axial bending. At this time, the positioning device can be adjusted to restore the two shafts to parallelism, thereby extending the service life of the equipment.

[0061] Example 2

[0062] This embodiment provides a winding device.

[0063] In one embodiment, it includes a roll and a film-pulling device. The roll is driven by a power unit and is adapted to roll the film. The film-pulling device, as described in Embodiment 1, is disposed on the movement path of the film and is located in front of the movement path relative to the roll. Because this device has the film-pulling device of Embodiment 1, the film remains flat before winding, avoiding wrinkles during winding and improving the yield of the film product.

[0064] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A film stretching device for flattening a film, characterized in that, include: The base (2) is adapted to be fixedly connected to the device where the film is located; The clamping device (1) is disposed opposite to both sides of the film and is fixedly connected to the base (2); The clamping device (1) includes: The fixed base (7) is fixedly connected to the base (2); The first roller shaft is fixedly connected to the fixed base (7); The first clamping roller (12) is rotatably connected to the first roller shaft; The second roller shaft (20) forms a swing connection with the fixed seat (7); The second clamping roller (11) is rotatably connected to the second roller shaft (20); The driving device causes the first clamping roller (12) and the second clamping roller (11) to perform a clamping action; when the first clamping roller (12) and the second clamping roller (11) are clamped, the rotation axes of the second clamping roller (11) and the first clamping roller (12) are parallel, and the film passes between the second clamping roller (11) and the first clamping roller (12); The film is a moving film. When viewed from a direction perpendicular to the film, the first roller shaft deflects toward the direction of the film, so that when the first clamping roller (12) and the second clamping roller (11) clamp each other, the rotation axis of the first clamping roller (12) forms an angle with the direction of movement of the film. The fixed seat (7) and the base (2) are connected by fastening bolts (6). At least one of the fixed seat (7) and the base (2) is provided with an arc-shaped hole (13). The fastening bolts (6) pass through the arc-shaped hole (13) so that the relative angle between the fixed seat (7) and the base (2) is adjustable. The driving device is a push cylinder (19), which pushes the second roller shaft (20) to swing so that the second clamping roller (11) clamps towards the first clamping roller (12); A pin (22) is inserted through the middle of the second roller (20), and a through groove (10) is opened on the fixed seat (7). The second roller (20) is located in the through groove (10), and the pin (22) is rotatably connected to the two side walls of the through groove (10). The end of the second roller (20) away from the second clamping roller (11) is pushed by the push cylinder (19). The two side walls of the through groove (10) are provided with elongated holes (21). The direction of the elongated holes (21) is consistent with the pushing direction of the push cylinder (19). The pin (22) is located in the elongated holes (21). A positioning device for limiting the pin (22) is provided in the elongated holes (21).

2. The film stretching device according to claim 1, characterized in that, The deflection angle is less than 90° and greater than or equal to 70°.

3. The film stretching device according to claim 1, characterized in that, An arc-shaped hole (13) is provided on the fixed seat (7), and a sliding groove (4) is provided on the base (2). The fastening bolt (6) passes through the sliding groove (4) and the arc-shaped hole (13) in sequence. The direction of the sliding groove (4) is consistent with the relative setting direction of the clamping device (1).

4. The film stretching device according to claim 3, characterized in that, The base (2) includes: Connecting block (23) is adapted to be fixedly connected to the device where the film is located; The base plate (3) is fixedly connected to the connecting block (23) and is provided with a sliding groove (4) that runs through both sides. The card plate (5) is set on the base plate (3) and is parallel to the slide groove (4); the nuts of the fastening bolts (6) are polygonal, and one edge of the fastening bolt (6) nuts is in contact with the side of the card plate (5).

5. A winding device, characterized in that, include: A roll, driven by a power unit, is suitable for rolling up film; The film pulling device, as described in any one of claims 1 to 4, is disposed on the movement path of the film and is located in front of the movement path relative to the roll.

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