An extrusion die
By introducing structures such as limiting grooves, limiting rods, pull rings, and springs into the extrusion die, the problems of time-consuming and labor-intensive die maintenance and uneven density in the existing technology are solved, achieving rapid installation and uniform density, thus improving the quality of polytetrafluoroethylene film.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LINFLON NEW MATERIAL TECH JIANGSU CO LTD
- Filing Date
- 2025-08-25
- Publication Date
- 2026-07-31
AI Technical Summary
The existing extrusion dies used in the production of polytetrafluoroethylene (PTFE) film require the bolts to be removed one by one during maintenance, which is time-consuming and labor-intensive. In addition, the extrusion dies cause inconsistent density between the middle and the edges of the film, affecting product quality.
An extrusion die head was designed, which adopts a structure of limiting groove, limiting rod, pull ring, spring and other components. The die head can be quickly installed and disassembled with the extruder through the guide protrusion and guide groove. The combination structure of the limiting rod and pull ring ensures connection stability and avoids the trouble of bolt disassembly.
It enables quick installation and disassembly of the extrusion die and extruder, improves operating efficiency, ensures uniformity of film density in the middle and at the edges, and enhances product quality.
Smart Images
Figure CN224576138U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of extrusion molding technology, specifically to an extrusion die. Background Technology
[0002] Polytetrafluoroethylene (PTFE) film is a microporous film made from PTFE through processes such as mixing, curing, preform preparation, extrusion, calendering, degreasing, longitudinal stretching, and transverse stretching. Due to its excellent microporous structure and the superior properties of PTFE, it is widely used in clothing, pharmaceuticals, electronics, and water treatment. In the production of PTFE film, the extrusion process directly determines the quality of the calendered substrate, thus affecting the final performance of the film. Currently, the extrusion dies used in PTFE film production all have circular extrusion nozzles. During extrusion, the preform passes through the nozzle and undergoes subsequent calendering. The preform is most concentrated in the center of the nozzle during extrusion. Therefore, even if the thickness of the PTFE film is uniform after processing, the density in the center of the film will be greater than that at the edges, resulting in inconsistent density and lower product quality.
[0003] Therefore, the extrusion die for producing polytetrafluoroethylene (PTFE) film disclosed in Chinese Patent Publication No. CN 208118382 U has a longitudinal height difference that is smaller than the transverse width difference. As a result, the shape of the extruded preform is also transversely wider than longitudinally thick. Therefore, when the preform is extruded from the body, the amount of preform in the middle of the preform has been homogenized to a certain extent under the shape of the extrusion hole, that is, the amount of preform in the middle and the edge is relatively close. In this way, after subsequent processing, the thickness of the PTFE film produced in the middle and the edge is consistent, and the density of the middle and the edge is also relatively close, which improves the quality of the PTFE film.
[0004] However, most of the existing extrusion dies used in the production of polytetrafluoroethylene films are fixed to the extruder with multiple bolts. During subsequent maintenance of the extrusion die, the staff still need to remove the bolts one by one, which is time-consuming, labor-intensive, and inconvenient to use. Utility Model Content
[0005] The purpose of this invention is to provide an extrusion die to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: An extrusion die includes an extrusion die body connected to an extruder via a connector. The extrusion die body has a preform cavity inside, with an extrusion port connected to one end. A limiting groove is formed on the outer wall of one end of the extrusion die body. Multiple limiting rods are provided on the inner wall of the connector, with one end of each limiting rod penetrating the side wall of the connector and fixedly connected to a pull ring. An installation cavity is formed inside the connector, through which the limiting rods pass. A limiting plate is fixedly installed at the end of each limiting rod inside the installation cavity, and a spring is fixedly installed on the limiting plate.
[0007] In a preferred embodiment, the limiting rod matches the limiting groove, and one end of the limiting rod located in the limiting groove is provided with an arc structure. By inserting the limiting rod into the limiting groove, the connector and the extrusion die body can be limited and fixed. The arc structure at the bottom of the limiting rod facilitates insertion into the limiting groove.
[0008] In a preferred embodiment, a guide protrusion is fixedly provided on the outer side wall of the extrusion die body, and a guide groove is provided on the inner side wall of the connector. The guide protrusion and the guide groove are matched. The arrangement of the guide protrusion and the guide groove facilitates the positioning of the connector and the extrusion die, so that the limiting rod and the limiting groove can be connected.
[0009] In a preferred embodiment, an annular groove is provided on the outer wall of the connector, the pull ring is disposed in the annular groove, and a support plate is fixedly disposed inside the annular groove. The pull ring can move in the annular groove, and the height of the pull ring is not higher than the outer wall of the connector during normal use.
[0010] In a preferred embodiment, a steel wire rope is provided on the support plate. The steel wire rope passes through the pull ring in sequence, through the through hole opened in the support plate, and is set on the steel wire rope double-locking buckle. The steel wire rope double-locking buckle is fixedly set on the support plate. A groove is opened at the bottom of the inner side wall of the pull ring. The groove matches the steel wire rope, so that the steel wire rope can pass through the pull ring and be fixed on the steel wire rope double-locking buckle. The steel wire rope can be used to press down and limit the pull ring to prevent the pull ring from moving.
[0011] In a preferred embodiment, the spring is sleeved on the limiting rod, and the end of the spring away from the limiting plate is fixedly disposed on the inner side wall of the mounting cavity. At least three sets of limiting rods are provided. The spring enables the limiting rod to abut against the limiting groove, and the fact that at least three sets of limiting rods are provided can ensure the stability of the connection between the connector and the extrusion die body.
[0012] In a preferred embodiment, three sets of limiting rods are provided. The limiting rods are evenly distributed circumferentially along the inner sidewall of the connector, that is, the limiting rods are triangularly symmetrically distributed on the circumferential surface. A stable connection can be achieved with only a few limiting rods.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model incorporates structures such as a limiting groove, a limiting rod, a pull ring, a limiting plate, a spring, a guide protrusion, and a guide groove. The extrusion die head body mates with the connector head via the guide protrusion and guide groove, ensuring that the limiting rod on the inner side of the connector head corresponds to the limiting groove on the outer side of the extrusion die head body. Under the action of the spring, the limiting rod is inserted into the limiting groove, thus achieving the installation and fixation of the connector head and the extrusion die head body. The installation of the connector head and the extrusion die head body can be completed without the need for other tools, making the operation simple. 2. This utility model uses a support plate, pull ring, wire rope, wire rope bidirectional lock, and groove structure. The pull ring facilitates the control of the limit rod, while the wire rope can press and limit the pull ring to prevent the limit rod and pull ring from moving and sliding out of the limit groove during use, which would affect the stability of the connection between the connector and the extrusion die head. Attached Figure Description
[0014] The accompanying drawings are provided to further illustrate 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, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial cross-sectional view of the connector of this utility model; Figure 3 This utility model Figure 2 Enlarged schematic diagram of the structure at point B; Figure 4 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the pull ring structure of this utility model.
[0015] In the diagram: 1. Extrusion die head body; 2. Connector; 3. Slot; 4. Extrusion port; 5. Limiting groove; 6. Limiting rod; 7. Pull ring; 8. Mounting cavity; 9. Limiting plate; 10. Spring; 11. Guide protrusion; 12. Guide groove; 13. Annular groove; 14. Support plate; 15. Steel wire rope; 16. Through hole; 17. Steel wire rope two-way lock. 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. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Example 1: Please see Figures 1-3 This utility model provides an extrusion die, the technical solution of which is as follows: An extrusion die includes an extrusion die body 1, which is connected to an extruder via a connector 2. The extrusion die body 1 has a preform cavity inside, with an extrusion port 4 connected to one end. A limiting groove 5 is formed on the outer wall of one end of the extrusion die body 1. Multiple limiting rods 6 are provided on the inner wall of the connector 2, with one end of each limiting rod 6 penetrating the side wall of the connector 2 and fixedly connected to a pull ring 7. An installation cavity 8 is formed inside the connector 2, through which the limiting rods 6 pass. A limiting disc 9 is fixedly provided at one end of the limiting rod 6 inside the installation cavity 8, and a spring 10 is fixedly provided on the limiting disc 9.
[0018] In a preferred embodiment, the limiting rod 6 matches the limiting groove 5, and one end of the limiting rod 6 located in the limiting groove 5 is provided with an arc structure. The limiting rod 6 can be inserted into the limiting groove 5 to realize the installation and fixation of the connector 2 and the extrusion die head body 1. The arc structure facilitates the insertion of the limiting rod 6 into the limiting groove 5.
[0019] In a preferred embodiment, a guide protrusion 11 is fixedly provided on the outer side wall of the extrusion die head body 1, and a guide groove 12 is provided on the inner side wall of the connector head 2. The guide protrusion 11 matches the guide groove 12, and the guide protrusion 11 slides along the guide groove 12 so that the limiting rod 6 on the inner side of the connector head 2 is connected to the limiting groove 5 on the outer side of the extrusion die head body 1.
[0020] In a preferred embodiment, the spring 10 is sleeved on the limiting rod 6, and the end of the spring 10 away from the limiting plate 9 is fixedly set on the inner side wall of the mounting cavity 8. The limiting rod 6 is provided with at least three sets. The setting of the spring 10 enables the limiting rod 6 to automatically spring into the limiting groove 5. The multiple sets of limiting rods 6 can ensure the stability of the connection between the connector 2 and the extrusion die body 1. The working principle of this utility model is as follows: When installing the extrusion die body 1, the guide protrusion 11 on the outer side of the extrusion die body 1 aligns with the guide groove 12 on the inner side of the connector 2, allowing the guide protrusion 11 to move along the guide groove 12. When the guide protrusion 11 moves to the innermost end of the guide groove 12, the limiting rod 6 corresponds to the limiting groove 5. Under the action of the spring 10, the limiting rod 6 is inserted into the limiting groove 5, preventing the extrusion die body 1 from being pulled out from the connector 2. This achieves the installation and fixation of the connector 2 and the extrusion die body 1, simplifying the operation. For disassembly, pull the pull ring 7, causing the pull ring 7 to slide the limiting rod 6 out of the limiting groove 5, thus pulling the extrusion die body 1 out from the connector 2.
[0021] Example 2: Please see Figure 1 and Figures 4-5 The outer side wall of the connector 2 is provided with an annular groove 13, the pull ring 7 is disposed in the annular groove 13, and a support plate 14 is fixedly disposed inside the annular groove 13. A steel wire rope 15 is disposed on the support plate 14. The steel wire rope 15 passes through the pull ring 7 in sequence, passes through the through hole 16 opened on the support plate 14, and is disposed on the steel wire rope double lock buckle 17. The steel wire rope double lock buckle 17 is fixedly disposed on the support plate 14. A slot 3 is provided at the bottom of the inner side wall of the pull ring 7, and the slot 3 matches the steel wire rope 15.
[0022] After the limiting rod 6 is inserted into the limiting groove 5, the wire rope 15 is passed through the pull ring 7 in sequence, and then through the through hole 16 on the support plate 14. After the wire rope 15 is passed through the pull ring 7, the wire rope 15 is tightened and is locked in the groove 3 inside the pull ring 7. The end of the wire rope 15 is placed in the wire rope double lock buckle 17 for locking. The wire rope double lock buckle 17 adopts an 8-shaped double-headed double-sided locking device, which can fix the wire rope 15 and limit the pull ring 7. It can prevent the pull ring 7 and the limiting rod 6 from automatically sliding out of the limiting groove 5, which would affect the installation stability of the extrusion die head body 1. During disassembly, remove the wire rope 15 from the wire rope double-lock 17, then remove the wire rope 15 from the pull ring 7 in sequence, and then pull the pull ring 7 so that the pull ring 7 drives the limit rod 6 to slide out of the limit groove 5, and then pull the extrusion die head body 1 out from the connector 2.
[0023] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An extrusion die comprising an extrusion die body (1) characterised in that: The extrusion die head body (1) is connected to the extruder via a connector (2). The extrusion die head body (1) has a blank cavity inside. One end of the blank cavity is connected to an extrusion port (4). A limiting groove (5) is opened on the outer side wall of one end of the extrusion die head body (1). Multiple limiting rods (6) are provided on the inner side wall of the connector (2). One end of the limiting rod (6) passes through the side wall of the connector (2) and is fixedly connected to a pull ring (7). An installation cavity (8) is opened inside the connector (2). The limiting rod (6) passes through the installation cavity (8). A limiting plate (9) is fixedly provided on one end of the limiting rod (6) inside the installation cavity (8). A spring (10) is fixedly provided on the limiting plate (9).
2. An extrusion die according to claim 1, characterized in that: The limiting rod (6) matches the limiting groove (5), and one end of the limiting rod (6) located in the limiting groove (5) is provided with an arc structure.
3. An extrusion die according to claim 2, wherein: The outer side wall of the extrusion die body (1) is fixedly provided with a guide protrusion (11), and the inner side wall of the connector (2) is provided with a guide groove (12), and the guide protrusion (11) matches the guide groove (12).
4. An extrusion die according to claim 1, characterized in that: The connector (2) has an annular groove (13) on its outer side wall. The pull ring (7) is located in the annular groove (13), and a support plate (14) is fixedly installed inside the annular groove (13).
5. An extrusion die according to claim 4, characterized in that: A steel wire rope (15) is provided on the support plate (14). The steel wire rope (15) passes through the pull ring (7) in sequence, passes through the through hole (16) opened on the support plate (14), and is set on the steel wire rope double lock (17).
6. An extrusion die according to claim 5, characterized in that: The steel wire rope bidirectional lock (17) is fixedly mounted on the support plate (14), and the bottom of the inner side wall of the pull ring (7) is provided with a slot (3), which matches the steel wire rope (15).
7. An extrusion die according to claim 1, characterized in that: The spring (10) is sleeved on the limiting rod (6), and the end of the spring (10) away from the limiting plate (9) is fixedly set on the inner side wall of the mounting cavity (8). The limiting rod (6) is provided with at least three sets.
8. An extrusion die according to claim 7, characterized in that: The limiting rod (6) is provided in 3 sets, and the limiting rod (6) is evenly distributed along the circumference of the inner sidewall of the connector (2).