Stretching device for plastic film production

Abstract

The application relates to the technical field of plastic film extrusion molding processing, in particular to a stretching device for plastic film production, which comprises a rack, a winding roller, a first conveying roller, a second conveying roller, a driving motor, a driving wheel, a transmission wheel, a rotating shaft, a rolling wheel, a cam, a supporting plate, a fixing base, a pneumatic cylinder and a clamping plate. The winding roller is located at the end of the rack to complete the final winding. The first and second conveying rollers cooperatively stably convey the plastic film to the winding station. The driving motor drives the rotating shaft and the cam mechanism through a belt, so that the supporting plate reciprocates along the vertical direction, intermittent jacking and stretching of the plastic film are implemented, overstretching or tearing of the plastic film is avoided, and the plastic film can be slightly adjusted when being relaxed, the stretching uniformity is improved, and the clamping plate driven by the pneumatic cylinder can adapt to different film thicknesses and provide uniform clamping force.

Description

Technical Field

[0001] This application relates to the field of plastic film extrusion molding technology, and in particular to an extension device for plastic film production. Background Technology

[0002] In the field of plastic film production, surface stretching is a critical process that directly affects the film's thickness uniformity, surface smoothness, and mechanical properties. Traditional stretching devices typically employ a simple roller system, where a drive motor continuously rotates multiple conveyor and take-up rollers via a transmission belt or gears to transport and wind the film. However, continuous stretching makes it difficult to achieve precise stretching control of the film, resulting in uneven distribution of stretching force. This can easily lead to localized over-stretching or under-stretching of the film, causing problems such as thickness fluctuations, surface wrinkling, or even cracking. Summary of the Invention

[0003] This application provides an extension apparatus for plastic film production to improve the production quality of plastic film extension forming process.

[0004] This application provides an extension device for producing plastic film, including a frame, a take-up roller, a first conveying roller, a second conveying roller, a drive motor, a drive wheel, a transmission wheel, a rotating shaft, a rolling wheel, a cam, a support plate, a fixed base, a cylinder, and a clamping plate.

[0005] The two ends of the take-up roller are rotatably mounted at the ends of the frame. The take-up roller is used to take up the film.

[0006] Two first conveyor rollers and one second conveyor roller are rotatably connected to the frame. The first and second conveyor rollers are both located on one side of the take-up roller. The first and second conveyor rollers are parallel and spaced apart. The second conveyor roller is located between the two first conveyor rollers. The rotation of the first and second conveyor rollers conveys the film to the take-up roller.

[0007] The drive motor is fixedly mounted at the bottom of the frame. The output end of the drive motor is equipped with a drive wheel. The two ends of the rotating shaft are rotatably connected to the frame. The rotating shaft is located on the side of the first conveyor roller away from the take-up roller. A transmission wheel is fixedly mounted on the rotating shaft. The transmission wheel and the drive wheel are connected by a belt. The rotating shaft is driven to rotate by the operation of the drive motor and the transmission wheel via the belt.

[0008] Rollers are fixed at both ends of the rotating shaft. The cam is connected to the frame. The rollers cooperate with the inside of the cam. The rotation axis of the cam is not collinear with the rotation axis of the rotating shaft. The top support plate of the cam is arranged vertically and extends along the width of the frame.

[0009] The fixed base is fixedly mounted on the frame, and the cylinder is fixedly mounted on the fixed base. The output end of the cylinder is connected to the clamping plate. The cylinder drives the clamping plate to move in the vertical direction to adjust the vertical gap size formed between the clamping plate and the fixed base for clamping the film.

[0010] The top of the pallet is located on the side of the clamping plate close to the first conveying roller. The top surface of the pallet moves vertically under the drive of the cam and intermittently acts on the bottom surface of the film material.

[0011] Furthermore, the rotation axis of the first conveyor roller and the rotation axis of the second conveyor roller are located on the same horizontal plane.

[0012] Furthermore, the highest moving position of the top surface of the pallet exceeds the surface of the fixed seat facing the clamping plate.

[0013] Furthermore, the vertical distance between the highest moving position of the top surface of the pallet and the surface of the fixed seat facing the clamping plate is in the range of 3mm-10mm.

[0014] Furthermore, the vertical distance between the highest moving position of the top surface of the pallet and the surface of the fixed seat facing the clamping plate is 5mm.

[0015] Furthermore, the rotation axis of the rotating shaft is set parallel to the rotation axis of the first conveying roller or the second conveying roller.

[0016] Furthermore, the top surface of the tray is made of rubber.

[0017] Furthermore, multiple cylinders are spaced apart along the width direction of the mounting base.

[0018] Furthermore, the cams are located at both ends of the rotating shaft, and the cams have rotating cavities inside, with rolling wheels connected inside the rotating cavities.

[0019] The beneficial effects of the technical solution provided in this application include: a take-up roller is set at the end of the frame for final film winding, while the first conveyor roller and the second conveyor roller work together to smoothly convey the film to the winding position. The rotation axes of the first conveyor roller and the second conveyor roller are located on the same horizontal plane, ensuring uniform force on the film during conveying, reducing the risk of deviation or wrinkling, and thus guaranteeing the flatness of the film surface.

[0020] The drive motor rotates the shaft via belt drive. Rollers on the shaft engage with the cam. Because the cam's rotation axis is not collinear with the shaft's axis, the cam drives the support plate to reciprocate vertically as it rotates. This allows the support plate to intermittently lift the bottom surface of the film, achieving periodic stretching of the film. Intermittent stretching helps prevent over-stretching or tearing of the film during transport due to continuous tension. It also allows for fine-tuning of the film in a relaxed state, improving the accuracy and uniformity of the stretching. The top surface of the support plate is made of rubber, further reducing frictional damage during contact with the film and protecting the film's surface integrity.

[0021] The cylinders are mounted on the frame via a fixed base, driving the clamping plate to move vertically, thereby adjusting the gap between the clamping plate and the fixed base. This adjustable clamping mechanism allows the device to adapt to films of different thicknesses or materials, ensuring moderate clamping force to prevent film slippage and avoid indentation damage. Multiple cylinders are spaced apart along the width of the fixed base, achieving uniform distribution of clamping force and enhancing overall stability. The highest moving position of the top surface of the support plate exceeds the surface of the fixed base by approximately 5mm, ensuring that the support plate can effectively lift the film and work in conjunction with the clamping system to provide proper support for the film during the stretching interval, preventing sagging or deformation. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of an extension device for producing plastic film provided in an embodiment of this application;

[0024] Figure 2 This is a partial internal structure diagram of an extension device for producing plastic film provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of an extension device for producing plastic film provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the structure of an extension device for producing plastic film, provided in an embodiment of this application. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Please refer to Figure 1 - Figure 4 As shown in the figure, this application provides an extension device for producing plastic film, including a frame 11, a take-up roller 23, a first conveying roller 21, a second conveying roller 22, a drive motor 31, a drive wheel 32, a transmission wheel 33, a rotating shaft 34, a rolling wheel 35, a cam 36, a support plate 37, a fixed base 41, a cylinder 42, and a clamping plate 43.

[0029] The two ends of the take-up roller 23 are rotatably mounted at the ends of the frame 11. The take-up roller 23 is used to take up the film.

[0030] Two first conveying rollers 21 and one second conveying roller 22 are rotatably connected to the frame 11. The first conveying rollers 21 and the second conveying roller 22 are both located on one side of the take-up roller 23. The first conveying rollers 21 and the second conveying roller 22 are parallel and spaced apart. The rotation axis of the first conveying roller 21 and the rotation axis of the second conveying roller 22 are located on the same horizontal plane. The second conveying roller 22 is located between the two first conveying rollers 21. The film is conveyed to the take-up roller 23 by the rotation of the first conveying rollers 21 and the second conveying roller 22.

[0031] The take-up roller 23 is rotatably mounted at both ends of the frame 11. Its purpose is to provide a film winding function, enabling continuous collection of the processed film. By being rotatably mounted on the frame 11, the take-up roller 23 can smoothly wind the film, ensuring that the film maintains uniform tension during the winding process and avoiding slack or wrinkles.

[0032] As the terminal execution component of the device, the take-up roller 23 works in conjunction with the conveyor roller system to receive the stretched film material and maintain a stable take-up speed, thereby ensuring the continuity and efficiency of the entire traction process and helping to improve the product quality of plastic film.

[0033] Two first conveyor rollers 21 and one second conveyor roller 22 are rotatably connected to the frame 11, and are all located on one side of the take-up roller 23, arranged parallel and spaced apart. The second conveyor roller 22 is located between the two first conveyor rollers 21, and the rotation axes of the first conveyor rollers 21 and the second conveyor roller 22 are located on the same horizontal plane. The purpose of this arrangement is to form a smooth conveying path, guiding the film smoothly from the device inlet to the take-up roller 23.

[0034] Through the coordinated rotation of the rollers, the film is evenly conveyed and supported. The central position of the second conveying roller 22 helps to balance the tension distribution of the film and reduce the film's offset or twisting during the conveying process.

[0035] The drive motor 31 is fixedly mounted at the bottom of the frame 11. The output end of the drive motor 31 is equipped with a drive wheel 32. The two ends of the rotating shaft 34 are rotatably connected to the frame 11. The rotating shaft 34 is located on the side of the first conveying roller 21 away from the take-up roller 23. A transmission wheel 33 is fixedly mounted on the rotating shaft 34. The transmission wheel 33 is connected to the drive wheel 32 by a belt. The rotating shaft 34 is driven to rotate by the operation of the drive motor 31 and the transmission of the belt and the transmission wheel 33.

[0036] The drive motor 31 is fixedly mounted at the bottom of the frame 11, and its purpose is to provide a stable and reliable power source for the stretching device used in plastic film production. The output end of the drive motor 31 is equipped with a drive wheel 32, which is connected to a transmission wheel 33 on the rotating shaft 34 via a belt. Both ends of the rotating shaft 34 are rotatably connected to the frame 11, and the rotating shaft 34 is located on the side of the first conveyor roller 21 away from the take-up roller 23. The operation of the drive motor 31, through the belt and transmission wheel 33, drives the rotating shaft 34 to rotate, thereby achieving a smooth power transmission from the motor to the rotating shaft 34.

[0037] The rotation of the shaft 34, through the cooperation of the rolling wheel 35 and the cam 36, causes the cam 36 to move periodically, thereby driving the support plate 37 to move vertically, realizing the intermittent stretching operation of the film material. The shaft 34 is located on the side of the conveyor roller away from the take-up roller 23, ensuring that the stretching mechanism can act in time before the film enters the take-up stage, working in coordination with the conveyor roller system to maintain the tension balance and conveying stability of the film, ultimately improving the uniformity of the film surface stretching and the processing efficiency.

[0038] Rolling wheels 35 are fixedly installed at both ends of the rotating shaft 34. The rotation axis of the rotating shaft 34 is parallel to the rotation axis of the first conveying roller 21 or the second conveying roller 22. The cam 36 is connected to the frame 11. The rolling wheels 35 cooperate with the interior of the cam 36. The rotation axis of the cam 36 is not collinear with the rotation axis of the rotating shaft 34. The top support plate 37 of the cam 36 is arranged vertically and extends along the width of the frame 11. The cam 36 is located at both ends of the rotating shaft 34. The interior of the cam 36 is provided with a rotating cavity, and the rolling wheels 35 are connected to the rotating cavity.

[0039] Roller wheels 35 are fixedly installed at both ends of the rotating shaft 34. The purpose of this arrangement is to effectively transmit the rotational motion of the rotating shaft 34 to the cam 36 mechanism to achieve motion conversion. The rotation axis of the rotating shaft 34 is arranged parallel to the rotation axis of the first conveying roller 21 or the second conveying roller 22 to ensure that the motion of the entire device is coordinated and consistent, avoid interference between components, and maintain the stability of the film conveying path.

[0040] The rolling wheel 35 engages internally with the cam 36, thereby converting the continuous rotation of the shaft 34 into the periodic motion of the cam 36. The rotation axis of the cam 36 is not collinear with the rotation axis of the shaft 34. This eccentric design allows the cam 36 to generate vertical displacement when rotating, thus providing power for the up-and-down movement of the support plate 37.

[0041] A support plate 37 is provided on the top of the cam 36. The support plate 37 is arranged vertically and extends along the width of the frame 11. Its purpose is to provide a wide support surface for the film, ensuring that the film is subjected to uniform force during the extension process and covering the entire width of the film.

[0042] Cams 36 are located at both ends of the rotating shaft 34. This symmetrical arrangement helps to balance the forces on the device during operation, improving operational stability and reliability. A rotating cavity is provided inside the cam 36, and a rolling wheel 35 is connected within the rotating cavity. This reduces friction and wear during movement, extends the service life of the components, and optimizes the smoothness of motion transmission.

[0043] Driven by the rotating shaft 34, the roller 35 and the cam 36 work together to convert the rotational motion into the vertical reciprocating motion of the pallet 37. Driven by the cam 36, the pallet 37 intermittently lifts the bottom surface of the film, thereby applying a periodic stretching force during the film transport process. This stretching operation helps to improve the surface properties of the film, such as improving flatness and reducing internal stress.

[0044] The extension of the support plate 37 along its width ensures a uniform distribution of stretching force, avoiding localized deformation, while the design of the cams 36 at both ends of the rotating shaft 34 ensures balanced operation of the device and reduces vibration. The stretching process is completed before the film enters the winding stage, maintaining film tension control and ultimately improving the production quality and processing efficiency of the plastic film.

[0045] The fixed base 41 is fixedly mounted on the frame 11, and the cylinder 42 is fixedly mounted on the fixed base 41. Multiple cylinders 42 are spaced apart along the width direction of the fixed base 41. The output end of the cylinder 42 is connected to the clamping plate 43. The cylinder 42 drives the clamping plate 43 to move in the vertical direction to adjust the vertical gap size formed between the clamping plate 43 and the fixed base 41 for clamping the film.

[0046] The cylinder 42 is fixedly mounted on the fixed base 41 as a power actuator, driving the clamping plate 43 to move vertically through the linear motion of its output end. Multiple cylinders 42 are spaced apart along the width direction of the fixed base 41 to ensure uniform distribution of clamping force, preventing local stress concentration or deformation of the film during clamping, thereby ensuring the flatness and integrity of the film.

[0047] The output end of the cylinder 42 is connected to the clamping plate 43. The extension and retraction of the cylinder 42 directly controls the lifting and lowering of the clamping plate 43, thereby dynamically adjusting the vertical gap between the clamping plate 43 and the fixed seat 41. This gap is specifically used to clamp the film to adapt to film materials of different thicknesses or materials, thereby improving the adaptability and operational flexibility of the device.

[0048] The top of the pallet 37 is located on the side of the clamping plate 43 close to the first conveying roller 21. The top surface of the pallet 37 moves vertically under the drive of the cam 36 and intermittently acts on the bottom surface of the film material.

[0049] The highest moving position of the top surface of the tray 37 exceeds the surface of the fixed seat 41 facing the clamping plate 43. Specifically, the vertical distance between the highest moving position of the top surface of the tray 37 and the surface of the fixed seat 41 facing the clamping plate 43 is in the range of 3mm-10mm. Preferably, the vertical distance between the highest moving position of the top surface of the tray 37 and the surface of the fixed seat 41 facing the clamping plate 43 is 5mm.

[0050] The top of the support plate 37 is located on the side of the clamping plate 43 near the first conveying roller 21. Its purpose is to ensure timely intervention in the film conveying path, providing support and guidance before the film enters the clamping area, thereby preventing film shifting or loosening during the stretching process. The top surface of the support plate 37 moves vertically under the drive of the cam 36, intermittently acting on the bottom surface of the film material. This intermittent motion is designed to apply periodic stretching forces to the film, improving its surface smoothness and mechanical properties by lifting and releasing it, reducing internal stress, and coordinating with the continuous conveying of the conveying roller to maintain stable film flow.

[0051] The highest point of the top surface of the support plate 37 extends beyond the surface of the fixing seat 41 facing the clamping plate 43. Specifically, the vertical distance between the support plate 37 and the surface of the fixing seat 41 ranges from 3mm to 10mm. This arrangement aims to provide sufficient lifting height to ensure the film can be fully lifted during the extension stage, avoiding interference with the fixing seat 41 or clamping plate 43, while ensuring effective transmission of the extension force. This distance is optimized to achieve sufficient extension without causing excessive deformation or tearing of the film, thereby improving operational accuracy and reliability.

[0052] The top surface of the tray 37 is made of rubber, which is designed to provide a soft contact surface for the film, reducing scratches or damage to the film during intermittent operation. The elasticity and anti-slip properties of the rubber material help to enhance the friction between the film and the tray 37, prevent slippage, and ensure uniform distribution of stretching force.

[0053] The top surface of the tray 37 moves vertically under the drive of the cam 36, intermittently acting on the bottom surface of the film material. Its purpose is to apply a periodic stretching force to the film, improving its surface smoothness and mechanical properties by lifting and releasing it. The tray 37 is located on the side of the clamping plate 43 closest to the first conveying roller 21, ensuring timely intervention before the film enters the clamping area. The rubber top surface provides a soft contact surface, reducing scratching of the film while enhancing friction to prevent slippage during stretching.

[0054] The highest moving position of the top surface of the tray 37 exceeds the surface of the fixed base 41. This design provides sufficient lifting height so that the film can be fully lifted, avoiding interference with the fixed base 41 or the clamping plate 43, thereby ensuring the effective transmission of the stretching force.

[0055] The clamping mechanism consists of a fixed base 41, a cylinder 42, and a clamping plate 43. The fixed base 41 is fixed to the frame 11. The cylinder 42 drives the clamping plate 43 to move vertically, adjusting the gap between the clamping plate 43 and the fixed base 41 to clamp the film. Multiple cylinders 42 are spaced apart along the width of the fixed base 41 to distribute the clamping force evenly and prevent local deformation of the film. When the film is conveyed by the conveyor roller to the vicinity of the take-up roller 23, the clamping mechanism gently clamps the edge of the film, providing necessary restraint to prevent the film from shifting when the pallet 37 is lifted.

[0056] The coordinated operation of the tray 37 and the clamping mechanism improves the stretching performance and quality of the film. During operation, the tray 37 intermittently lifts the bottom surface of the film for stretching, while the clamping mechanism fixes specific parts of the film, ensuring that the stretching force is applied evenly across the entire film width and preventing wrinkles or tears. This coordination maintains the tension balance of the film, making the stretching operation more precise and consistent. The rubber top surface of the tray 37 further protects the film surface and reduces defects.

[0057] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An extension device for producing plastic film, characterized in that, It includes a frame, take-up roller, first conveyor roller, second conveyor roller, drive motor, drive wheel, transmission wheel, shaft, rolling wheel, cam, support plate, fixed seat, cylinder, and clamping plate; The two ends of the take-up roller are rotatably mounted at the ends of the frame, and the take-up roller is used to take up the film; Two first conveying rollers and one second conveying roller are rotatably connected to the frame. The first conveying roller and the second conveying roller are both located on one side of the take-up roller. The first conveying roller and the second conveying roller are parallel and spaced apart. The second conveying roller is located between the two first conveying rollers. The film is conveyed to the take-up roller by the rotation of the first conveying roller and the second conveying roller. The drive motor is fixedly mounted at the bottom of the frame, and the drive wheel is mounted at the output end of the drive motor. The two ends of the rotating shaft are rotatably connected to the frame. The rotating shaft is located on the side of the first conveying roller away from the take-up roller. The transmission wheel is fixedly mounted on the rotating shaft. The transmission wheel and the drive wheel are connected by a belt. The rotating shaft is driven to rotate by the operation of the drive motor and the transmission wheel via the belt. The two ends of the rotating shaft are fixedly provided with the rolling wheels, the cam is connected to the frame, the rolling wheels cooperate with the interior of the cam, the rotation axis of the cam is not collinear with the rotation axis of the rotating shaft, the top of the cam is provided with the support plate, the support plate is arranged in the vertical direction and extends along the width direction of the frame; The fixed base is fixedly mounted on the frame, the cylinder is fixedly mounted on the fixed base, and the output end of the cylinder is connected to the clamping plate. The cylinder drives the clamping plate to move in the vertical direction to adjust the vertical gap size formed between the clamping plate and the fixed base for clamping the film. The top of the pallet is located on the side of the clamping plate close to the first conveying roller. The top surface of the pallet moves vertically under the drive of the cam and intermittently acts on the bottom surface of the film material.

2. The stretching device for plastic film production according to claim 1, characterized in that, The rotation axis of the first conveying roller and the rotation axis of the second conveying roller are located on the same horizontal plane.

3. The stretching device for plastic film production according to claim 2, characterized in that, The highest moving position of the top surface of the tray exceeds the surface of the fixing seat facing the clamping plate.

4. The stretching device for producing plastic film according to claim 3, characterized in that, The vertical distance between the highest moving position of the top surface of the pallet and the surface of the fixing seat facing the clamping plate is in the range of 3mm-10mm.

5. The stretching device for producing plastic film according to claim 4, characterized in that, The vertical distance between the highest moving position of the top surface of the pallet and the surface of the fixing seat facing the clamping plate is 5mm.

6. The stretching device for producing plastic film according to claim 4, characterized in that, The rotation axis of the rotating shaft is parallel to the rotation axis of the first conveying roller or the second conveying roller.

7. The stretching device for producing plastic film according to claim 1, characterized in that, The top surface of the tray is made of rubber.

8. The stretching device for producing plastic film according to claim 1, characterized in that, The cylinders are spaced apart along the width of the mounting base.

9. The stretching device for producing plastic film according to claim 1, characterized in that, The cams are located at both ends of the rotating shaft, and the cams have a rotating cavity inside, with the rolling wheel connected inside the rotating cavity.

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