A plastic film production traction device

Abstract

A traction device for plastic film production includes: two clamping plates arranged at an angle; multiple linearly arranged guide rollers rotatably disposed within the clamping plates; a fluid piping assembly disposed on both sides of each clamping plate, with the guide rollers connected to the fluid piping assembly and both ends of the guide rollers rotatably disposed on the fluid piping assembly for connecting cooling fluid in the fluid piping assembly; and a traction roller rotatably disposed at the output end of a herringbone plate assembly. This invention achieves active cooling of the roller surface by circulating cold water into each guide roller above the traction roller, removing the heat accumulated on its surface due to contact with the film. This fundamentally avoids problems such as high-temperature film adhesion, surface scratches, or wrinkles caused by excessively high roller surface temperature, effectively improving production stability and film quality.

Description

Technical Field

[0001] This utility model belongs to the field of plastic film technology, specifically referring to a traction device for plastic film production. Background Technology

[0002] In the plastic film blow molding process, the molten plastic preform extruded through the die is blown into a bubble tube and rises under the action of the traction device. It needs to be converged and folded by a herringbone plate before being guided into the traction roller. As a key component that determines the flatness and surface quality of the film, the performance of the herringbone plate directly affects the product grade.

[0003] In actual production processes, especially during high-speed or thick-film production, the film releases a significant amount of heat during the cooling and curing stage. When the still-high-temperature film surface comes into contact with the herringbone sheet, the metal herringbone material commonly used in existing technologies, due to its excellent thermal conductivity, will quickly absorb this heat. However, if this heat cannot be dissipated in a timely and effective manner, it will cause a significant increase in the temperature of the herringbone sheet itself, leading to two major problems: First, when the high-temperature sheet surface comes into contact with the film, it can easily cause localized softening of the film surface, resulting in a sticking phenomenon. This can not only create scratches or "mirror" indentations on the film surface, affecting the appearance quality, but in severe cases, it can even cause the film to break, leading to production line interruption. Second, the abnormal increase in localized temperature can disrupt the uniformity of the film cooling process, potentially causing differences in crystallinity, resulting in uneven physical properties of the film and even wrinkles. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the prior art, this utility model provides a traction device for plastic film production, which at least partially solves the above problems.

[0005] The technical solution adopted by this utility model is as follows: An embodiment of this utility model provides a traction device for plastic film production, comprising: A herringbone panel assembly comprising two panels arranged at an angle to each other; Multiple linearly arranged guide rollers are rotatably disposed within the clamping plate; A fluid piping assembly is provided on both sides of each of the clamps. The guide roller is connected to the fluid piping assembly, and both ends of the guide roller are rotatably mounted on the fluid piping assembly for connecting the cooling fluid in the fluid piping assembly. A traction roller is rotatably located at the output end of the herringbone plate assembly.

[0006] Furthermore, the guide roller includes an outer cylinder, an inner cylinder, and an end shaft. The outer cylinder is sleeved on the inner cylinder and forms a gap space between them. The end shaft is symmetrically arranged at both ends of the outer cylinder and communicates with the gap space. The end shaft communicates with the inner cavity of the fluid pipeline assembly.

[0007] Furthermore, the fluid pipeline assembly is provided with multiple connecting sleeves, and the end shaft is rotatably disposed within the connecting sleeves.

[0008] Furthermore, a one-way valve is provided inside the end shaft located on the cooling fluid return path.

[0009] Furthermore, the traction device for plastic film production proposed in this embodiment of the present invention also includes an angle adjustment mechanism for adjusting the included angle of the herringbone plate assembly; the angle adjustment mechanism includes a fixed frame, a rotating plate, and a sliding rod; The fixed frame is equipped with multiple sets of supports; The rotating plate is rotatably mounted on the support, and its axis of rotation is parallel to the axis of the guide roller; One end of the slide rod is hinged to the side wall of the clamping plate via a flange, and the other end is slidably connected to the rotating plate; by driving the slide rod to slide in the rotating plate, the clamping plate is opened and closed to change the included angle.

[0010] Furthermore, the bottom of the clamping plate is provided with a bottom shaft, which is rotatably mounted on a fixed frame. The side wall of the fixed frame is provided with an angle adjustment motor, which drives the two bottom shafts to rotate synchronously in opposite directions through a gear set, so as to realize the opening and closing of the herringbone plate assembly.

[0011] Furthermore, the traction roller is located at the discharge end of the bottom shaft, the traction roller is rotatably mounted on the fixed frame, and the side wall of the fixed frame is provided with a traction motor. The output end of the traction motor is connected to the traction roller for driving its rotation.

[0012] The beneficial effects achieved by this utility model are as follows: By circulating cold water into each guide roller above the traction roller, the heat accumulated on its surface due to contact with the film can be efficiently removed, thus achieving active cooling of the roller surface; fundamentally avoiding problems such as high-temperature adhesion of film, surface scratches or wrinkles caused by excessive roller surface temperature, effectively improving production stability and film quality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the traction device for producing plastic film according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a traction device for producing plastic film according to an embodiment of the present invention; Figure 3 for Figure 1 Enlarged view of section I; Figure 4 This is a schematic diagram showing the connection relationship between the clamping plate, guide roller, and fluid piping assembly. Figure 5 A broken view of the cross-sectional view of the guide roller; Figure 6This is a fracture view of the fluid piping assembly.

[0014] The components are: 1. Fixed frame, 2. Clamping plate, 3. Guide roller, 4. Fluid pipeline assembly, 5. Angle adjustment motor, 6. Traction motor, 7. Bottom shaft, 8. Traction roller, 9. Support, 10. Turning plate, 11. Slide rod, 12. Flange, 13. Outer cylinder, 14. Inner cylinder, 15. End shaft, 16. One-way valve, 17. Connecting sleeve.

[0015] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0017] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "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 utility model 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 utility model.

[0018] like Figure 1 and Figure 2As shown in the embodiment of this utility model, a traction device for producing plastic film includes a herringbone plate assembly, guide rollers 3, a fluid pipeline assembly 4, and traction rollers 8. The herringbone plate assembly consists of two clamping plates 2 arranged at an angle. The guide rollers 3 are rotatably disposed within the clamping plates 2 and are linearly arranged along the traction direction of the plastic film within the clamping plates 2. During the traction process, the plastic film slides along the guide rollers 3 on the surface of the clamping plates 2. Due to the angle of the clamping plates 2, the plastic film gradually shrinks from a cylindrical shape to a thin, flat shape during the sliding process. The angle of the clamping plates 2 can be adjusted, and the angle can be adjusted according to the characteristics of the plastic film during production. The fluid pipeline assembly 4 is disposed on both sides of each clamping plate 2, and cooling fluid flows through the fluid pipeline assembly 4. One side of the fluid pipeline... Assembly 4 is the input end, and the fluid pipeline assembly 4 on the other side is the output end. The guide roller 3 is connected to the fluid pipeline assembly 4, and both ends of the guide roller 3 are rotatably mounted on the fluid pipeline assembly 4. The guide roller 3 is connected to the cooling fluid in the fluid pipeline assembly 4. During the frictional rotation of the guide roller 3 and the plastic film, the cooling fluid flowing into the guide roller 3 will exchange heat with the plastic film, avoiding problems such as high-temperature adhesion, surface scratches or wrinkles of the film, effectively improving production stability and film quality. The high-temperature fluid that has completed the exchange in the guide roller 3 will flow out from the fluid pipeline assembly 4 at the output end, and the cycle continues in this way. The traction roller 8 is rotatably mounted at the output end of the herringbone plate assembly. The traction roller 8 is driven to rotate, providing the main traction force for the plastic film.

[0019] In some embodiments, such as Figures 4-6 As shown, due to the large number of guide rollers 3 on the herringbone plate assembly, to reduce overall weight, the guide roller 3 includes an outer cylinder 13, an inner cylinder 14, and an end shaft 15. The outer cylinder 13 is coaxially sleeved on the inner cylinder 14, forming a gap space between them. The inner cylinder 14 has a hollow inner cavity. The outer cylinder 13 and the inner cylinder 14 are connected by a connecting column (not shown in the attached figure), which ensures the coaxial fixation of the inner cylinder 14 and the outer cylinder 13 without closing the gap space. The end shaft 15 is symmetrically arranged at both ends of the outer cylinder 13 and communicates with the gap space. The end shaft 15 communicates with the inner cavity of the fluid pipeline assembly 4. This arrangement significantly reduces the overall weight of the guide roller 3, and each structure is a thin-walled cylinder, which also enables... The surface of the guide roller 3 is cooled. During operation, the low-temperature fluid in the fluid pipeline assembly 4 flows into the gap space between the outer cylinder 13 and the inner cylinder 14 through the end shaft 15, which cools the outer wall of the outer cylinder 13 of the guide roller 3 and exchanges heat during the frictional contact with the plastic film, thereby cooling the plastic film. Then the fluid flows out from the end shaft 15 on the other side. In order to keep the guide roller 3 connected to the fluid pipeline assembly 4 during the rotation, multiple connecting sleeves 17 are connected to the fluid pipeline assembly 4. The end shaft 15 is rotatably located in the connecting sleeve 17. The end shaft 15 and the connecting sleeve 17 are sealed and rotatably connected, which not only meets the rotation requirements of the guide roller 3, but also allows the fluid to flow normally.

[0020] In some embodiments, the fluid after heat exchange needs to flow out from the fluid pipeline assembly 4 at the other end. Since the guide rollers 3 are linearly arranged, the connecting sleeves 17 rotatably connected to the guide rollers 3 are also linearly arranged. In order to prevent the fluid in the adjacent connecting sleeves 17 from flowing back, that is, the fluid in the upper output end connecting sleeve 17 flows back into the adjacent lower output end connecting sleeve 17, or the fluid in the lower output end connecting sleeve 17 flows back into the adjacent upper output end connecting sleeve 17, a one-way valve 16 is provided in the end shaft 15 on the cooling fluid return path. The one-way valve 16 makes the fluid in the guide rollers 3 flow only to the output end and will not flow back.

[0021] In some embodiments, such as Figure 1 and Figure 3 As shown, in order to facilitate the adjustment of the included angle between the clamping plates 2, the traction device for plastic film production proposed in this embodiment of the utility model further includes an angle adjustment mechanism for adjusting the included angle of the herringbone plate assembly; the angle adjustment mechanism includes a fixed frame 1, a rotating plate 10 and a sliding rod 11; the fixed frame 1 is provided with multiple sets of supports 9; the rotating plate 10 is rotatably mounted on the supports 9, and its rotation axis is parallel to the axis of the guide roller 3; one end of the sliding rod 11 is hinged to the side wall of the clamping plate 2 through a flange 12, and the other end is slidably connected to the rotating plate 10; by driving the sliding rod 11 to slide in the rotating plate 10, the clamping plates 2 are driven to open and close to change the included angle. Through the action of the rotating plate 10 and the flange 12, the sliding rod 11 keeps the upper part of the clamping plate 2 fixed and provides a certain support force to the upper part of the clamping plate 2, making the angle of the clamping plate 2 more stable.

[0022] In some embodiments, such as Figure 1 and Figure 2 As shown, the bottom of the clamping plate 2 is provided with a bottom shaft 7, which is rotatably mounted on the fixed frame 1. The side wall of the fixed frame 1 is provided with an angle adjustment motor 5. When the angle adjustment motor 5 is working, it drives the two bottom shafts 7 to rotate synchronously in opposite directions through a gear set, and drives the clamping plate 2 to rotate synchronously in opposite directions, so that the two clamping plates 2 rotate towards or away from each other, thereby realizing the angle adjustment. At the same time as the rotation, the slide rod 11 at the top of the clamping plate 2 also makes adaptive changes with the rotating plate 10 and the flange 12.

[0023] In some embodiments, the traction roller 8 is located at the discharge end of the bottom shaft 7, the traction roller 8 is rotatably mounted on the fixed frame 1, and the side wall of the fixed frame 1 is provided with a traction motor 6. The output end of the traction motor 6 is connected to the traction roller 8 for driving its rotation. There are two traction rollers 8, and a certain gap is reserved between the two traction rollers 8. This gap distance is adapted to the thickness of the plastic film. The traction roller 8 squeezes the plastic film and provides friction to it, driving the plastic film to move continuously.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A traction device for plastic film production, characterized in that, include: A herringbone panel assembly, comprising two panels arranged at an angle (2); Multiple linearly arranged guide rollers (3) are rotatably disposed within the clamping plate (2); A fluid piping assembly (4) is provided on both sides of each clamping plate (2). The guide roller (3) is connected to the fluid piping assembly (4), and both ends of the guide roller (3) are rotatably provided on the fluid piping assembly (4) for connecting the cooling fluid in the fluid piping assembly (4). The traction roller (8) is rotatably located at the output end of the herringbone plate assembly.

2. The traction device for plastic film production according to claim 1, characterized in that: The guide roller (3) includes an outer cylinder (13), an inner cylinder (14) and an end shaft (15). The outer cylinder (13) is sleeved on the inner cylinder (14) and forms a gap space between them. The end shaft (15) is symmetrically arranged at both ends of the outer cylinder (13) and communicates with the gap space. The end shaft (15) communicates with the inner cavity of the fluid pipeline assembly (4).

3. The traction device for plastic film production according to claim 2, characterized in that: The fluid pipeline assembly (4) is provided with multiple connecting sleeves (17), and the end shaft (15) is rotatably disposed within the connecting sleeves (17).

4. The traction device for plastic film production according to claim 3, characterized in that: A one-way valve (16) is provided inside the end shaft (15) located on the cooling fluid return path.

5. The traction device for plastic film production according to claim 1, characterized in that: It also includes an angle adjustment mechanism for adjusting the included angle of the herringbone panel assembly; the angle adjustment mechanism includes a fixed frame (1), a rotating plate (10) and a sliding rod (11). The fixed frame (1) is provided with multiple sets of supports (9); The rotating plate (10) is rotatably mounted on the support (9), and its rotation axis is parallel to the axis of the guide roller (3); One end of the slide rod (11) is hinged to the side wall of the clamping plate (2) via a flange (12), and the other end is slidably connected to the rotating plate (10); by driving the slide rod (11) to slide in the rotating plate (10), the clamping plate (2) is driven to open and close to change the included angle.

6. The traction device for plastic film production according to claim 5, characterized in that: The bottom of the clamp (2) is provided with a bottom shaft (7), which is rotatably mounted on the fixed frame (1). The side wall of the fixed frame (1) is provided with an angle adjustment motor (5). The angle adjustment motor (5) drives the two bottom shafts (7) to rotate synchronously in opposite directions through a gear set, so as to realize the opening and closing of the herringbone plate assembly.

7. The traction device for plastic film production according to claim 6, characterized in that: The traction roller (8) is located at the discharge end of the bottom shaft (7). The traction roller (8) is rotatably mounted on the fixed frame (1), and the side wall of the fixed frame (1) is provided with a traction motor (6). The output end of the traction motor (6) is connected to the traction roller (8) for driving its rotation.

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