Polyester film extrusion die with cleaning structure

Abstract

This utility model discloses a polyester film extrusion die with a cleaning structure, belonging to the field of plastic processing machinery. Addressing the problem of incomplete cleaning of residues on the inner wall of existing die exits, the following solution is provided: The die body features a gradient cavity structure, with grooves on the side walls and trapezoidal cross-section scrapers. The bottom end of the scraper is connected to the inner cavity of the main rod via a threaded rod. Rotating the threaded rod adjusts the scraper position to ensure a tight fit against the gradient inner wall. A sliding seat and sliding frame are installed on the outer wall of the main rod to achieve lateral movement. An external protective sleeve covers the operating side hole, and the sleeve is connected to the sliding seat via a tension spring. A sealing plate with a compression spring is installed at the top of the inner cavity; the sealing plate remains in contact with the scraper during movement to prevent foreign objects from entering. This device, through scraper shape adaptation and position adjustment mechanisms, more effectively cleans residues from the inner wall. The protective sleeve structure prevents accidental contact with operating parts, ensuring the reliability and convenience of cleaning operations.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing machinery technology, and in particular to a polyester film extrusion die with a cleaning structure. Background Technology

[0002] During the production of polyester film, molten resin residue easily adheres to the inner wall of the die head outlet. Traditional cleaning methods rely on manual operation using a handheld scraper inserted into the die head. However, because the die head flow channel typically employs a gradient structure that is wider at the inside and narrower at the outside, ordinary scrapers cannot completely adhere to the inner wall, making cleaning inconvenient and affecting the quality of the film product. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of incomplete cleaning in existing technologies by proposing a polyester film extrusion die with a cleaning structure.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A polyester film extrusion die with a cleaning structure includes a die body having a gradient cavity structure inside;

[0006] The sliding frame has brackets fixedly connected to both sides of the mold head body, and the two ends of the sliding frame are respectively fixedly connected to the two brackets;

[0007] A cleaning mechanism includes a scraper and a main rod. The side wall of the mold head body is provided with a groove. The scraper is located in the groove and is set with a trapezoidal cross section to adapt to the gradient inner wall at the exit of the mold head body. The main rod is provided with an inner cavity. The bottom end of the scraper slides into the inner cavity. A threaded rod is threaded in the inner cavity. The top end of the threaded rod is rotatably connected to the bottom end of the scraper.

[0008] The scraper is positioned by rotating the threaded rod to ensure it fits tightly against the inner wall of the die head outlet, thereby removing residue.

[0009] In one possible design, a sliding seat is fixedly connected to the top of the outer wall of the main rod, and the sliding seat is slidably sleeved on the outer wall of the sliding frame.

[0010] In one possible design, the outer wall of the main rod has a side hole that communicates with the inner cavity, and a polygonal block is fixedly sleeved on the outer wall of the threaded rod, with the polygonal block located within the range of the side hole.

[0011] In one possible design, a protective sleeve is slidably fitted onto the outer wall of the main rod, and the protective sleeve covers the side hole. A limiting rod is fixedly connected to the outer wall of the protective sleeve. A limiting cylinder is fixedly connected to the outer wall of the bracket, and the limiting rod is inserted into the interior of the limiting cylinder. A tension spring is fitted onto the outer wall of the main rod, and the two ends of the tension spring are connected to the sliding seat and the protective sleeve respectively through hooks.

[0012] In one possible design, a limit block is fixedly connected to the bottom end of the main rod.

[0013] In one possible design, the top of the inner walls on both sides of the inner cavity are fixedly connected to a limiting shaft, the outer wall of the limiting shaft is slidably sleeved with a sealing plate, and the sealing plate is in contact with the scraper. The outer wall of the limiting shaft is sleeved with a compression spring, and the two ends of the compression spring are connected to the sealing plate and the inner cavity side wall respectively through spring seats.

[0014] When the scraper is adjusted, the sealing plate remains in contact with the scraper under the action of the compression spring to prevent foreign objects from entering the inner cavity.

[0015] In one possible design, the top of the scraper is wider than the bottom to adapt to the gradient inner wall of the mold head body.

[0016] In this application, during actual use, the operator slides the protective sleeve downwards, causing the limiting rod to disengage from the inside of the limiting sleeve, thus releasing the limiting state of the main rod. Then, it is moved to the outlet of the mold head body. When the protective sleeve is moved downwards, the side hole will also be exposed. At this point, the polygonal block can be manually rotated, causing the internal threaded rod to rotate, thereby displacing the top scraper so that the scraper fits against the inner wall of the mold head body opening. The main rod can then be grasped and moved to scrape the residue from the inner wall to the end, which can then be removed. After this, the main rod is moved back to its original position, and the protective sleeve covers the side hole again, ensuring that the internal threaded rod is not accidentally touched, facilitating continued use even if the outlet width has not been adjusted. The limiting rod is also reinserted into the limiting sleeve to limit the main rod and prevent movement during use.

[0017] In this utility model, the polyester film extrusion die with a cleaning structure can be adapted to the gradient inner wall of the die through a trapezoidal scraper, so that it can better fit the inner wall and thus perform the scraping cleaning operation.

[0018] In this utility model, the polyester film extrusion die head with a cleaning structure can cover the side hole used for operation through the protective sleeve, thereby avoiding accidental contact and ensuring that it can be used directly next time. At the same time, it can limit the main rod to ensure that it will not be displaced during the operation of the die head.

[0019] In this invention, during use, the scraper can fit snugly against the inner wall of the gradient channel at the outlet, thereby facilitating the removal of residues remaining on the inner wall and achieving the cleaning operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of a polyester film extrusion die with a cleaning structure proposed in this utility model;

[0021] Figure 2 This utility model Figure 1 Enlarged view of the structure of section A;

[0022] Figure 3 This is a cross-sectional structural diagram of a polyester film extrusion die with a cleaning structure proposed in this utility model;

[0023] Figure 4 This utility model Figure 3 Enlarged view of the structure of part B.

[0024] In the diagram: 1. Die head body; 2. Sliding frame; 3. Support; 4. Sliding seat; 5. Tension spring; 6. Protective sleeve; 7. Main rod; 8. Limiting rod; 9. Limiting cylinder; 10. Scraper; 11. Inner cavity; 12. Polygonal block; 13. Side hole; 14. Limiting block; 15. Threaded rod; 16. Sealing plate; 17. Compression spring; 18. Limiting shaft. Detailed Implementation

[0025] 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.

[0026] In one embodiment: Reference Figure 1-2 An extrusion die includes: a die body 1, which has a gradient cavity structure inside, cooperating with a scraper 10 with a trapezoidal cross-section; molten polyester resin enters from the inlet, is evenly distributed along the internal flow channel of the die, and is finally extruded from the lip outlet to form a film. Symmetrically distributed supports 3 are fixed to the outer wall of its sub-plate by bolts, and the two ends of the sliding frame 2 are rigidly connected to the supports 3 by welding.

[0027] In the cleaning mechanism, a sliding seat 4 is fixedly installed on the outer wall of the main rod 7, and the sliding seat 4 is slidably sleeved on the outer wall of the sliding frame 2. The protective sleeve 6 is slidably sleeved on the outer wall of the main rod 7 to cover the through hole 13 opened on the outer wall of the main rod 7. The top of the protective sleeve 6 is elastically connected to the sliding seat 4 through a tension spring 5, and the limiting rod 8 fixedly installed on the outer wall is inserted into the limiting cylinder 9 on the side wall of the bracket 3 to form an insertion fit.

[0028] refer to Figure 2-3The scraper 10 adopts a trapezoidal cross-section design, with its top width being greater than its bottom width, and is embedded in the matching groove on the inner wall of the die head body 1. The bottom end of the scraper 10 slides into the inner cavity 11 of the main rod 7, and the threaded rod 15 with threads inside the inner cavity 11 is rotatably connected to the bottom end of the scraper 10 through a bearing. By rotating the threaded rod 15, the position of the scraper 10 is controlled. A polygonal block 12 is fixedly sleeved on the outer wall of the threaded rod 15, and the polygonal block 12 is located in the area of ​​the side hole 13, so that when the protective sleeve 6 slides down, the side hole 13 can be exposed, thereby facilitating the operator to rotate the threaded rod 15 through the polygonal block 12.

[0029] In actual operation, first slide the protective sleeve 6 downwards along the outer wall of the main rod 7, causing the limiting rod 8 to disengage from the limiting cylinder 9, thus releasing the limiting state of the main rod 7. At this time, the scraper 10 can be moved to the outlet of the die head 1. Then, manually rotate the polygonal block 12 through the side hole 13, driving the threaded rod 15 to rotate, causing the scraper 10 to move along the inner cavity 11 until its outer wall is tightly fitted with the inner wall of the die head outlet. Then push the main rod 7 along the sliding frame 2, and the scraper 10 scrapes the residue to the end of the die head. After cleaning, release the protective sleeve 6, which resets under the action of the tension spring 5. The limiting rod 8 is reinserted into the limiting cylinder 9, and the side hole 13 is completely covered, making it convenient to continue using it next time when the outlet width is not adjusted.

[0030] This application can be used in the field of plastic processing machinery, or in other fields applicable to this application.

[0031] In another embodiment: Reference Figure 4 A polyester film extrusion die with a cleaning structure is applied in the field of plastic processing machinery. Limiting shafts 18 are fixedly installed on the top of the inner walls on both sides of the inner cavity 11. A sealing plate 16 is slidably sleeved on the outer wall of the limiting shaft 18, and the sealing plate 16 is in contact with the scraper 10. A compression spring 17 is sleeved on the outer wall of the limiting shaft 18, and the two ends of the compression spring 17 are connected to the sealing plate 16 and the side wall of the inner cavity 11 respectively through spring seats.

[0032] Specifically, when the screw rod 15 is rotated to control the movement of the scraper 10, the sealing plate 16 will be kept in contact with the side wall of the scraper 10 under the action of the spring, thereby preventing the scraped foreign objects from falling into the inner cavity 11.

[0033] refer to Figure 3 The limiting block 14 fixed at the bottom of the main rod 7 is used to prevent the protective sleeve 6 from detaching from the surface of the main rod 7.

[0034] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A polyester film extrusion die with a cleaning structure, characterized in that, include: The main body of the mold head (1) has a gradually changing cavity structure inside; The sliding frame (2) has brackets (3) fixedly connected to both sides of the mold head body (1), and the two ends of the sliding frame (2) are fixedly connected to the two brackets (3) respectively. The cleaning mechanism includes a scraper (10) and a main rod (7). The side wall of the mold body (1) is provided with a groove. The scraper (10) is located in the groove and is set with a trapezoidal cross section to adapt to the gradient inner wall at the outlet of the mold body (1). The main rod (7) is provided with an inner cavity (11). The bottom end of the scraper (10) slides into the inner cavity (11). A threaded rod (15) is threaded in the inner cavity (11). The top end of the threaded rod (15) is rotatably connected to the bottom end of the scraper (10). The position of the scraper (10) is adjusted by rotating the threaded rod (15) so that it fits tightly against the inner wall of the outlet of the die head body (1), thereby scraping away the residue.

2. The polyester film extrusion die with a cleaning structure according to claim 1, characterized in that, The top of the outer wall of the main rod (7) is fixedly connected to a sliding seat (4), and the sliding seat (4) is slidably sleeved on the outer wall of the sliding frame (2).

3. The polyester film extrusion die with a cleaning structure according to claim 1, characterized in that, The outer wall of the main rod (7) is provided with a side hole (13) that communicates with the inner cavity (11). The outer wall of the threaded rod (15) is fixedly sleeved with a polygonal block (12), and the polygonal block (12) is located within the range of the side hole (13).

4. The polyester film extrusion die with a cleaning structure according to claim 3, characterized in that, The outer wall of the main rod (7) is slidably fitted with a protective sleeve (6), and the protective sleeve (6) covers the side hole (13). The outer wall of the protective sleeve (6) is fixedly connected with a limiting rod (8), and the outer wall of the bracket (3) is fixedly connected with a limiting cylinder (9). The limiting rod (8) is inserted into the inside of the limiting cylinder (9). The outer wall of the main rod (7) is fitted with a tension spring (5), and the two ends of the tension spring (5) are connected to the sliding seat (4) and the protective sleeve (6) respectively through hooks.

5. A polyester film extrusion die with a cleaning structure according to claim 4, characterized in that, The bottom end of the main rod (7) is fixedly connected to a limiting block (14).

6. A polyester film extrusion die with a cleaning structure according to claim 1, characterized in that, The top of the inner walls on both sides of the inner cavity (11) are fixedly connected to a limiting shaft (18). The outer wall of the limiting shaft (18) is slidably sleeved with a sealing plate (16), and the sealing plate (16) is in contact with the scraper (10). The outer wall of the limiting shaft (18) is sleeved with a compression spring (17), and the two ends of the compression spring (17) are connected to the sealing plate (16) and the side wall of the inner cavity (11) respectively through spring seats. When the scraper (10) is adjusted, the sealing plate (16) is always in contact with the scraper (10) under the action of the compression spring (17) to prevent foreign objects from entering the inner cavity (11).

7. A polyester film extrusion die with a cleaning structure according to any one of claims 1-6, characterized in that, The top width of the scraper (10) is greater than that of the bottom width to achieve adaptation to the gradient inner wall of the mold head body (1).

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