Plastic extrusion pulling device

Abstract

This utility model discloses a plastic extrusion traction device, including a protective base plate; protective side plates are fixedly connected to both sides of the upper end of the protective base plate, a plastic extruder is installed inside the protective side plates, pressing and traction components for use with the plastic extruder are installed inside the two sets of protective side plates, and two sets of positioning and guiding traction components located to the sides of the pressing and traction components are installed inside the two sets of protective side plates, with an adjustable guiding traction component installed between the two sets of positioning and guiding traction components. The pressing and traction components of this utility model can provide initial guidance and limitation for the plastic profile extruded from the plastic extruder, guiding the profile into the subsequent traction stage according to a preset path. The positioning and guiding traction components can further position and guide the plastic profile, ensuring that the profile maintains a stable posture and path during traction. The adjustable guiding traction component can be adjusted according to different specifications of plastic profiles, improving the adaptability of the device to different products.

Description

Technical Field

[0001] This utility model relates to the field of traction device technology, and in particular to a plastic extrusion traction device. Background Technology

[0002] The plastic extrusion traction device is a core auxiliary equipment in the plastic extrusion molding production line. Its main function is to continuously and stably traction, cool and shape the high-temperature, softened plastic profiles extruded from the extruder die, and then transport them to the subsequent cutting or winding process to ensure the dimensional accuracy and shape stability of the products.

[0003] Traditional plastic extrusion traction devices mostly use a fixed pressure design or manual mechanical adjustment, such as adjusting the roller spacing through bolts and shims. This cannot achieve dynamic and precise pressure control. When processing plastic products of different thicknesses or hardnesses, if the fixed pressure is too low, traction slippage will occur, resulting in wrinkles and deformation on the product surface. If the fixed pressure is too high, the product will be over-compressed, causing surface damage or internal structural destruction. It is also not possible to quickly adjust the traction for sheets of different widths or pipes of different diameters.

[0004] Therefore, in response to the problems of inaccurate pressure control, inability to dynamically adjust, difficulty in adapting to different specifications of plastic products, and easy occurrence of traction slippage, product deformation or damage in the traditional plastic extrusion traction device, a new plastic extrusion traction device needs to be designed. Utility Model Content

[0005] In order to overcome the problems of inaccurate pressure control, inability to dynamically adjust, difficulty in adapting to different specifications of plastic products, and easy to cause traction slippage, product deformation or damage in traditional plastic extrusion traction devices.

[0006] The technical solution is as follows: A plastic extrusion traction device includes a protective base plate; protective side plates are fixedly connected to both sides of the upper end of the protective base plate; a plastic extruder is installed inside the protective side plates; pressing traction components for use with the plastic extruder are installed inside the two sets of protective side plates; two sets of positioning guide traction components located on the sides of the pressing traction components are installed inside the two sets of protective side plates; an adjustable guide traction component is installed between the two sets of positioning guide traction components; the pressing traction component includes a support vertical plate installed on the upper end of the protective base plate; and a guide traction plate is installed on the upper end of the support vertical plate.

[0007] Furthermore, a protective top plate is installed on the inner top of the two sets of protective side plates, and a lifting cylinder is installed on the upper end of the protective top plate. A linkage lifting plate is installed at the output end of the lifting cylinder.

[0008] Furthermore, lifting side plates are installed on both sides of the linkage lifting plate, and a limit groove is opened through the inside of the protective side plate. A limit slider that slides inside the limit groove is fixedly connected to the side end of the lifting side plate.

[0009] Furthermore, a first servo motor is installed on the inner side of a set of lifting side plates, a first rotating rod is installed at the output end of the first servo motor, and a pressing roller is installed on the outer side of the first rotating rod.

[0010] Furthermore, the positioning and guiding traction assembly includes a control frame plate installed inside a set of protective side plates. A second servo motor is installed inside the control frame plate, and a second rotating rod is installed at the output end of the second servo motor.

[0011] Furthermore, a fixed side plate is installed on the inner side of another set of protective side plates, which is rotatably connected to the other end of the second rotating rod, and a first guide roller is installed on the outer side of the second rotating rod.

[0012] Furthermore, the adjustable guide traction assembly includes a protective outer cover plate installed inside the two sets of protective side plates. A bidirectional cylinder is installed inside the protective outer cover plate, and two sets of bidirectional linkage blocks are installed at the output end of the bidirectional cylinder.

[0013] Furthermore, a guide groove is provided inside the protective outer cover plate, a fixed side plate is installed on the side end of the bidirectional linkage block, a third servo motor is installed inside the fixed side plate, a third rotating rod is installed at the output end of the third servo motor, and a compression traction roller is installed on the outside of the third rotating rod.

[0014] The beneficial effects are as follows: The pressing and traction component of this utility model can play a preliminary guiding and limiting role on the plastic profile extruded from the plastic extruder, guiding the profile into the subsequent traction stage according to the preset path, avoiding the profile from deviating in the initial stage, and laying the foundation for subsequent precise traction. The positioning and guiding traction component can further position and guide the plastic profile, ensuring that the profile maintains a stable posture and path during the traction process, reducing dimensional errors or shape defects caused by deviation. The adjustable guiding traction component can be adjusted according to different specifications of plastic profiles, improving the adaptability of the device to different products, expanding the application range of the device, eliminating the need to replace equipment separately for different products, reducing production costs. The positioning and guiding traction component and the adjustable guiding traction component are used together to form multi-segment, multi-directional traction and guidance, making the plastic profile more uniformly stressed and more stable in movement during the traction process, further ensuring the dimensional accuracy and shape stability of the product. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the plastic extrusion traction device of this utility model;

[0016] Figure 2This is a three-dimensional structural diagram of the guide traction plate of this utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the extrusion roller of this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the protective outer cover of this utility model.

[0019] In the attached drawings: 1. Protective base plate; 2. Protective side plate; 3. Plastic extruder; 201. Limiting groove; 401. Supporting vertical plate; 402. Guide traction plate; 403. Protective top plate; 404. Lifting cylinder; 405. Linked lifting plate; 406. Lifting side plate; 407. Limiting slider; 408. First servo motor; 409. First rotating rod; 410. Extrusion roller; 501. Control frame plate; 502. Second servo motor; 503. Second rotating rod; 504. Fixed side plate; 505. First guide roller; 601. Protective outer cover plate; 602. Bidirectional cylinder; 603. Bidirectional linkage block; 604. Guide groove; 605. Fixed side mounting plate; 606. Third servo motor; 607. Third rotating rod; 608. Extrusion traction roller. Detailed Implementation

[0020] As a core auxiliary equipment in plastic extrusion molding production lines, the performance of plastic extrusion traction devices directly determines the quality stability and production efficiency of plastic products. In actual production, it needs to precisely connect the extruder with subsequent processing links, continuously and stably traction the high-temperature, softened plastic profiles, such as pipes, sheets, and special profiles, extruded from the extruder die, and complete the shaping with the help of the cooling system, and smoothly transport them to the cutting or winding process, ultimately ensuring the dimensional accuracy of the products, such as the diameter deviation of pipes and the uniformity of sheet thickness, and the shape stability, such as the regularity of profile cross-section.

[0021] However, traditional plastic extrusion traction devices have revealed many insurmountable technical defects in long-term use, which seriously restrict the modern plastics processing industry's demand for diversified, high-precision, and high-efficiency production.

[0022] From the perspective of pressure control, traditional traction structures generally adopt a fixed pressure design or rely on manual mechanical adjustment. The core adjustment method is to change the roller spacing through a combination of bolts and shims, thereby indirectly controlling the pressure on the profile. The limitations of this design are first reflected in the adjustment accuracy: manual operation relies on worker experience, and there is no quantitative correspondence between the bolt rotation angle and pressure change. It often requires repeated trial and error to approach the target pressure, resulting in a pressure control error that often exceeds ±0.2MPa. For the production of soft PE pipes, if the pressure deviation is only 0.1MPa, insufficient pressure may cause traction slippage, resulting in periodic wrinkles on the pipe surface. In the processing of rigid PVC sheets, excessive pressure will cause the edges of the sheet to be over-compressed, resulting in indentations or internal stress concentration, which will easily lead to cracking during subsequent use.

[0023] More importantly, traditional equipment cannot achieve dynamic pressure regulation. When the production line switches to different thicknesses, such as from 2mm thin plates to 5mm thick plates, or to profiles with different hardness, such as from Shore A60 soft TPU to Shore D80 hard ABS, the machine must be stopped to disassemble and replace gaskets or rotate bolts. The whole process takes at least 30 minutes. In mass production, this kind of shutdown adjustment not only reduces equipment utilization, with the effective operating rate of the equipment often being less than 60%, but also leads to batch-to-batch product quality differences. That is, the first 50 products after the first adjustment often have dimensional deviations due to unstable pressure, with a scrap rate as high as 8% or more.

[0024] In terms of specification adaptability, traditional equipment lacks the ability to quickly adjust to plates of different widths and pipes of different diameters. Taking pipe production as an example, traditional positioning and guiding structures mostly use guide rings of fixed sizes. When the pipe diameter is switched from 50mm to 100mm, the entire guide ring assembly needs to be replaced. During the replacement process, the concentricity of the guide ring and the traction roller also needs to be recalibrated. Even a slight deviation will cause the pipe to become eccentric during traction, resulting in an ellipticity of the final product exceeding 0.5mm. For plate production, the spacing adjustment of traditional lateral guide rollers relies on manual lead screws, with an adjustment range of only 50-150mm. After adjustment, the parallelism error of the two rollers often exceeds 0.1mm / m, causing lateral offset during traction of wide plates, such as those with a width exceeding 300mm, with an edge straightness deviation of up to 2mm / m. During subsequent cutting, an additional 5-10mm of edge waste needs to be removed, reducing material utilization by 10%-15%.

[0025] Furthermore, the power transmission system of traditional equipment also has significant shortcomings. It typically uses ordinary asynchronous motors paired with gear reducers, with speed adjustment relying on mechanical shifting, resulting in speed fluctuations exceeding ±5 r / min. When the extrusion speed fluctuates by ±0.2 m / min due to changes in the molten state of the raw material, the traditional traction device cannot respond in real time, leading to unstable profile stretch ratios. For example, in PP sheet production, a matching error between traction speed and extrusion speed exceeding 1% will result in a sheet thickness deviation exceeding 0.1 mm, failing to meet the requirements of high-precision products. Simultaneously, traditional traction rollers are mostly made of metal with smooth surfaces, resulting in insufficient friction with the profile. Especially when traction smooth PET sheets, slippage is frequent, and the sheet surface generates static electricity due to friction, attracting dust and affecting the quality of subsequent printing or lamination processes.

[0026] The root of these problems lies in the lack of a systematic approach to dynamic adjustment and precise control in the structural design of traditional equipment. Its rigid mechanical structure and low degree of adjustment make it unsuitable for the "multi-variety, small-batch, high-precision" production trends in modern plastics processing. For example, in the production of precision plastic profiles for automobiles, dimensional deviations caused by pressure fluctuations in traditional equipment can lead to excessive gaps in profile assembly; in the production of plastic tubing for medical use, surface scratches can cause turbulence during liquid transport, affecting flow stability.

[0027] Therefore, addressing the problems of inaccurate pressure control, lack of dynamic adjustment, poor specification adaptability, and sluggish power response in traditional plastic extrusion traction devices, the design of a new type of plastic extrusion traction device integrating dynamic pressure adjustment, rapid specification adaptation, and precise speed synchronization has become an urgent industry need. This new device requires stepless pressure adjustment via a pneumatic or hydraulic servo system, coupled with a PLC control system to automatically match pressure with the profile hardness and thickness. It employs modular guide components, using motor drive to achieve rapid adjustment of the guide spacing, covering a range of 20-500mm, while ensuring a parallelism error of less than 0.05mm / m after adjustment. Multiple servo motors drive the traction rollers, achieving precise speed control of ±0.1r / min to ensure real-time synchronization with the extrusion speed. Simultaneously, the roller surface treatment needs optimization; such as overmolding or diamond patterns, to increase friction while preventing profile damage, ultimately achieving efficient and high-quality traction of plastic products of different specifications and materials.

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Please see Figures 1-4This utility model provides an embodiment of a plastic extrusion traction device, including a device protective base plate 1; protective side plates 2 are fixedly connected to both sides of the upper end of the device protective base plate 1, a plastic extruder 3 is installed inside the protective side plates 2, a pressing traction component for use with the plastic extruder 3 is installed inside the two sets of protective side plates 2, two sets of positioning guide traction components located on the sides of the pressing traction components are installed inside the two sets of protective side plates 2, an adjustable guide traction component is installed between the two sets of positioning guide traction components, the pressing traction component includes a support vertical plate 401 installed on the upper end of the device protective base plate 1, a guide traction plate 402 is installed on the upper end of the support vertical plate 401, the surface of the guide traction plate 402 is polished and covered with a wear-resistant coating, which reduces the frictional resistance when the profile passes through, and guides the high-temperature softened profile just extruded from the plastic extruder 3 to smoothly enter the next stage, preventing deformation caused by unstable initial posture.

[0030] Please see Figures 3-4 In this embodiment, a protective top plate 403 is installed on the inner top of the two sets of protective side plates 2. A lifting cylinder 404 is installed on the upper end of the protective top plate 403. A linkage lifting plate 405 is installed on the output end of the lifting cylinder 404. The lifting cylinder 404 adopts high-precision pneumatic control. Its piston rod is rigidly connected to the linkage lifting plate 405. By adjusting the air pressure, the linkage lifting plate 405 can be lifted steplessly, thereby accurately controlling the pressure of the extrusion component below on the profile.

[0031] Lifting side plates 406 are installed on both sides of the linkage lifting plate 405. A limiting groove 201 is opened through the inside of the protective side plate 2. A limiting slider 407 that slides inside the limiting groove 201 is fixedly connected to the side end of the lifting side plate 406. The limiting slider 407 is made of wear-resistant engineering plastic and cooperates with the limiting groove 201 to ensure the smoothness of the lifting process and strictly limit the movement trajectory of the lifting side plate 406, so that it only moves in the vertical direction, avoiding the misalignment of the center line of the extrusion roller 410 and the guide traction plate 402 due to lateral deviation, and ensuring that the profile is subjected to uniform force.

[0032] A first servo motor 408 is installed inside a set of lifting side plates 406. A first rotating rod 409 is installed at the output end of the first servo motor 408. An extrusion roller 410 is installed on the outside of the first rotating rod 409. The extrusion roller 410 adopts a rubber coating process. The hardness of the rubber layer can be adjusted according to the material of the profile. It can increase the contact area with the profile through elastic deformation, improve friction and prevent slippage, and avoid scratching the surface of the profile, thus ensuring the appearance quality of the product.

[0033] The positioning and guiding traction assembly includes a control frame plate 501 installed inside a set of protective side plates 2. A second servo motor 502 is installed inside the control frame plate 501. A second rotating rod 503 is installed at the output end of the second servo motor 502. The second servo motor 502 is connected to the second rotating rod 503 through a reducer, and can output a stable torque to drive the first guide roller 505 to rotate at a preset speed.

[0034] Another set of protective side plates 2 has a fixed side plate 504 installed on the inner side, which is rotatably connected to the other end of the second rotating rod 503. A first guide roller 505 is installed on the outer side of the second rotating rod 503. The first guide roller 505 can limit the profile to prevent it from shifting left or right during the traction process and ensure the straightness of the product.

[0035] The adjustable guide traction assembly includes a protective outer cover plate 601 installed inside the two sets of protective side plates 2. A bidirectional cylinder 602 is installed inside the protective outer cover plate 601. Two sets of bidirectional linkage blocks 603 are installed at the output end of the bidirectional cylinder 602. The protective outer cover plate 601 is made of transparent acrylic material, which not only provides protection but also allows operators to observe the traction status of the profile in real time.

[0036] The protective outer cover plate 601 has a guide groove 604 inside. A fixed side plate 605 is installed on the side end of the bidirectional linkage block 603. A third servo motor 606 is installed inside the fixed side plate 605. A third rotating rod 607 is installed at the output end of the third servo motor 606. A compression traction roller 608 is installed on the outside of the third rotating rod 607. The surface of the compression traction roller 608 adopts a diamond pattern design to further increase the friction with the profile. With the adjustable spacing design, it can adapt to the diverse traction needs from narrow profiles to wide plates.

[0037] In use, the plastic raw material is melted and plasticized by the plastic extruder 3 and then extruded. The profile enters the guide traction plate 402 of the pressing traction assembly for initial guidance. The lifting cylinder 404 drives the linkage lifting plate 405 and the two side lifting side plates 406 to move vertically along the limiting slide groove 201 and the limiting slider 407, which drives the extrusion roller 410 to adjust the distance with the guide traction plate 402 to match the profile thickness. The first servo motor 408 drives the extrusion roller 410 to rotate to provide initial traction force.

[0038] Then, the second servo motor 502 drives the first guide roller 505 to rotate, and in conjunction with the second rotating rod 503 supported by the fixed side plate 504, it performs lateral positioning and conveying of the profile. When the profile enters the adjustable guide traction assembly, the bidirectional cylinder 602 pushes the bidirectional linkage block 603 to slide along the guide groove 604, driving the fixed side plates 605 on both sides and the extrusion traction roller 608 to move synchronously in opposite directions or in opposite directions, automatically adjusting the spacing to adapt to profiles of different widths. The third servo motor 606 drives the extrusion traction roller 608 to provide the main traction force, achieving precise guidance and traction. The protective outer cover plate 601, the protective top plate 403, the protective side plate 2 and the device protective bottom plate 1 jointly protect the parts and stabilize the overall structure, completing the continuous traction and shaping of the profile.

Claims

1. A plastic extrusion traction device, characterized in that, The device includes a protective base plate (1); protective side plates (2) are fixedly connected to both sides of the upper end of the protective base plate (1); a plastic extruder (3) is installed inside the protective side plate (2); a pressing and traction assembly for use with the plastic extruder (3) is installed inside the two sets of protective side plates (2); two sets of positioning and guiding traction assemblies located on the side of the pressing and traction assembly are installed inside the two sets of protective side plates (2); an adjustable guiding traction assembly is installed between the two sets of positioning and guiding traction assemblies; the pressing and traction assembly includes a support vertical plate (401) installed on the upper end of the protective base plate (1); a guiding traction plate (402) is installed on the upper end of the support vertical plate (401).

2. The plastic extrusion traction device according to claim 1, characterized in that, The inner top of the two sets of protective side plates (2) is equipped with a protective top plate (403), and a lifting cylinder (404) is installed on the upper end of the protective top plate (403). A linkage lifting plate (405) is installed at the output end of the lifting cylinder (404).

3. The plastic extrusion pulling device of claim 2, wherein, Lifting side plates (406) are installed on both sides of the linkage lifting plate (405). A limit groove (201) is opened through the inside of the protective side plate (2). A limit slider (407) that slides inside the limit groove (201) is fixedly connected to the side end of the lifting side plate (406).

4. The plastic extrusion pulling device of claim 3, wherein, A first servo motor (408) is installed on the inner side of a set of lifting side plates (406), a first rotating rod (409) is installed on the output end of the first servo motor (408), and a pressing roller (410) is installed on the outer side of the first rotating rod (409).

5. The plastic extrusion pulling device of claim 1, wherein, The positioning and guiding traction assembly includes a control frame plate (501) installed inside a set of protective side plates (2). A second servo motor (502) is installed inside the control frame plate (501), and a second rotating rod (503) is installed at the output end of the second servo motor (502).

6. The plastic extrusion pulling device of claim 5, wherein, Another set of protective side plates (2) has a fixed side plate (504) installed on the inner side, which is rotatably connected to the other end of the second rotating rod (503), and a first guide roller (505) is installed on the outer side of the second rotating rod (503).

7. The plastic extrusion traction device according to claim 6, characterized in that, The adjustable guide traction assembly includes a protective outer cover (601) installed inside the two sets of protective side plates (2). A two-way cylinder (602) is installed inside the protective outer cover (601), and two sets of two-way linkage blocks (603) are installed at the output end of the two-way cylinder (602).

8. The plastic extrusion pulling device of claim 7, wherein, The protective outer cover plate (601) has a guide groove (604) inside. A fixed side plate (605) is installed on the side end of the bidirectional linkage block (603). A third servo motor (606) is installed inside the fixed side plate (605). A third rotating rod (607) is installed at the output end of the third servo motor (606). A compression traction roller (608) is installed on the outside of the third rotating rod (607).

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