High-speed extrusion die for silicon core pipe
By using a high-speed extrusion die with a multi-layer flow channel and multiple compression structure, the problems of delamination and uneven inner wall in the high-speed production of silicon core tubes have been solved, achieving high-speed and stable production and the molding of high-quality silicon core tubes.
Patent Information
- Application Number
- CN202422718807.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-08
AI Technical Summary
Existing silicon core tube extrusion molds are prone to separation of the silicon core layer from the high-density polyethylene pipe wall, uneven inner wall, and flow phenomena during high-speed production, resulting in poor product quality.
It adopts a multi-layer flow channel design and a multi-compression structure, including a core layer flow channel, an outer layer flow channel, a confluence flow channel, a release section, a compression section, and a forming section. Combined with the protruding structure on the spiral body, it achieves uniform distribution and multiple compression of materials, and stabilizes the melt flow.
This technology enables high-speed and stable molding of silicon core tubes, eliminating the problems of inner wall spiral lines and delamination, and ensuring the smoothness and sealing performance of the inner wall of the product.
Smart Images
Figure CN223520159U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to the technical field of plastic forming, in particular to a high-speed extrusion die for a silicon core pipe. BACKGROUND
[0002] The silicon core pipe is a new type of composite pipe with a silicon gel solid lubricant on the inner wall, has excellent sealing performance and chemical corrosion resistance, and is widely applied to optical cable communication network systems of highways and railways.
[0003] The main raw material of the silicon core pipe is high-density polyethylene, and the core layer is a solid lubricant silicon gel with a low friction coefficient. The speed of the production line is not very fast if the traditional silicon core pipe extrusion die is used. If the extrusion speed is increased, a plurality of problems will occur: first, the silicon core pipe product is layered, and the silicon core layer and the high-density polyethylene pipe wall are separated; second, the inner wall of the silicon core pipe product produces a spiral line, so that the inner wall of the pipe product is uneven and rough, and the internal communication cable is easily damaged; and third, the inner wall temperature is high during high-speed extrusion, and the silicon core pipe product cannot be formed due to the flow phenomenon. SUMMARY
[0004] The application aims to solve the problem of slow extrusion speed of the silicon core pipe in the prior art. The application provides a high-speed extrusion die for a silicon core pipe.
[0005] To achieve the above-mentioned purpose, the application adopts the following technical scheme:
[0006] The application provides a high-speed extrusion die for a silicon core pipe, which comprises a first spiral body, a second spiral body and an outer die sleeve. The front end of the outer die sleeve is further provided with a front die sleeve and a die orifice. The die orifice is provided with a core die connected to the front part of the first spiral body. The first spiral body and the second spiral body form a core layer flow channel for conveying the core layer material of the silicon core pipe. The outer die sleeve and the second spiral body form an outer layer flow channel for conveying the outer layer of the silicon core pipe. The outer die sleeve and the first spiral body, the front die sleeve and the first spiral body and the die orifice and the core die form a confluence flow channel. The confluence flow channel is sequentially provided with a release section, a first compression section, a second compression section and a forming section from upstream to downstream. The cross-sectional area of the release section, the first compression section, the second compression section and the forming section decreases in sequence, and the cross-sectional area of the release section is greater than the sum of the cross-sectional areas of the core layer flow channel and the outer layer flow channel. The cross-sectional areas of the first compression section and the second compression section gradually decrease from upstream to downstream.
[0007] In a possible implementation, the rear end of the outer sleeve is further provided with a distributor, the distributor is provided with a core material distribution channel, and the rear end of the first spiral body is provided with a plurality of distribution channels communicated with the spiral groove.
[0008] In a possible implementation, the first spiral body is provided with a first protrusion, and the first protrusion is located at the outlet of the core layer channel.
[0009] In a possible implementation, the second spiral body is provided with a second protrusion, and the second protrusion is located at the outlet of the outer layer channel.
[0010] In a possible implementation, the core mold comprises a conical part connected with the front end of the first spiral body, a flat part located at the front side of the conical part, and a neck part located between the flat part and the conical part.
[0011] In a possible implementation, the cross-sectional area of the forming section is equal.
[0012] In a possible implementation, a transition section with equal cross-sectional area is further arranged between the first compression section and the second compression section. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 A structure schematic diagram of a high-speed extrusion die for a silicon core tube is provided for an embodiment of the present application;
[0014] Figure 2 A structure schematic diagram of a high-speed extrusion die for a silicon core tube is provided for an embodiment of the present application; Figure 1 A local enlarged view of A in FIG. 4;
[0015] Figure 3 A structure schematic diagram of a high-speed extrusion die for a silicon core tube is provided for an embodiment of the present application;
[0016] Figure 4 A structure schematic diagram of a high-speed extrusion die for a silicon core tube is provided for an embodiment of the present application;
[0017] 1. Core material channel; 2. Distribution channel; 3. Core layer channel; 4. Outer layer channel; 5. Release section; 6. First compression section; 7. Second compression section; 8. Forming section; 10. Distributor; 20. First spiral body; 21. Spiral groove; 22. First protrusion; 30. Second spiral body; 31. Second protrusion; 40. Outer sleeve; 50. Front sleeve; 60. Die; 70. Core mold; 71. Conical part; 72. Neck part; 73. Third protrusion. DETAILED DESCRIPTION
[0018] In order to explain the technical content, structural features, purposes and effects of the utility model, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. In the following description, for the purpose of explanation, a number of specific details are set forth in order to provide a thorough understanding of various exemplary embodiments or implementations of the present application. However, various exemplary embodiments can also be practiced without these specific details or with one or more equivalent arrangements. In addition, various exemplary embodiments can be different, but not necessarily mutually exclusive. For example, the specific shape, structure and characteristics of an exemplary embodiment can be used or implemented in another exemplary embodiment without departing from the inventive concept.
[0019] Hereinafter, the terms "first", "second", and the like are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.
[0020] In the present application, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through an intermediate medium.
[0021] Referring to Figure 1 As shown in the drawings, the embodiments of the present application give a kind of silicon core tube high-speed extrusion die for silicon core tube production. The extrusion die includes: first spiral body 20, second spiral body 30, outer die sleeve 40, distributor 10, front die sleeve 50 and die head 60 and core die 70. The rear of first spiral body 20 and second spiral body 30 are provided with spiral groove 21, and the core layer flow channel 3 for conveying silicon core tube core layer material is formed between first spiral body 20 and second spiral body 30, and the outer layer flow channel 4 for conveying silicon core tube outer layer is formed between outer die sleeve 40 and second spiral body 30.
[0022] The distributor 10 is located at the rear end of the outer die sleeve 40, and the core layer material flow channel 1 is formed on the distributor 10, and the rear end of the first spiral body 20 is provided with a plurality of distribution flow channels 2 communicating with the spiral groove 21. In some embodiments, a plurality of distributors can also be provided, or the core layer material flow channel and the outer layer material flow channel are provided on the distributor at the same time, and the outer layer material flow channel communicates with the spiral groove on the second spiral body through the distribution flow channel. The material billet of the spiral extruder is evenly distributed into the spiral groove of the first and second spiral bodies through the distributor, and the material is evenly pushed forward through the spiral groove, which can effectively solve the problem of uniformity of product layering.
[0023] Referring to Figure 2 As shown, the first spiral body 20 is provided with a first protrusion 22, and the first protrusion 22 is located at the outlet of the core layer flow channel 3. The second spiral body 30 is provided with a second protrusion 31, and the second protrusion 31 is located at the outlet of the outer layer flow channel 4. When the melt passes through the irregular velocity distribution area between the spiral bodies, it will be subjected to different shear forces, and the material is compressed for the first time at the first protrusion 22 and the second protrusion 31 (i.e. the outlet end of the core layer flow channel 3 and the outer layer flow channel 4) to improve the compactness of the material.
[0024] Referring to Figure 3 , 4 As shown, the core layer material and the outer layer material pass through the core layer flow channel 3 and the outer layer flow channel 4 respectively, and then converge at the front end of the second spiral body and enter the converging flow channel. The converging flow channel is provided with a release section 5, a first compression section 6, a second compression section 7 and a forming section 8 in sequence from upstream to downstream.
[0025] Please continue to refer to Figure 1 The outer sleeve 40 and the front sleeve 50 and the first spiral body 20 define a release section 5 with a substantially constant cross-sectional area, and the width of the release section 5 increases rapidly relative to the width of the converging flow channel at the inlet. The material entering the converging flow channel from upstream releases internal stress at this location. The release section 5 extends horizontally in the axial direction for a distance, so that the material after mixing by the spiral body can enter a relatively long melt release area. The release section 5 can reduce the internal stress caused by the elastic deformation of the melt, stabilize the axial flow of the fluid, and provide sufficient time and space for the melt to recover the deformation, fully fuse and release the internal stress, and thus stabilize the product forming quality.
[0026] The front sleeve 50 and the front part of the first spiral body 20 form a first compression section 6 with a gradually decreasing cross-sectional area from upstream to downstream, and the maximum cross-sectional area of the first compression section is less than or equal to the cross-sectional area of the release section 5. The melt is compressed for the second time in the first compression section 6. Then it enters the transition section between the first compression section 6 and the second compression section 7, and the cross-sectional area of each part of the transition section is equal.
[0027] Referring to Figure 3 As shown, the core die 70 is located in the mouth die 60, and the core die 70 is connected to the front part of the first spiral body 20. The core die 70 includes a conical part 71 connected to the front end of the first spiral body 20, a flat part 73 with a constant outer diameter located on the front side of the conical part 71, and a neck part 72 located between the flat part 73 and the conical part 71. The cross-sectional area of each part of the forming section 8 is equal.
[0028] The second compression section 7 is formed between the die 60 and the conical part 71 of the core 70, and has a cross-sectional area gradually decreasing from upstream to downstream, and the maximum cross-sectional area of the second compression section 7 is less than or equal to the cross-sectional area of the first compression section 6 and the transition section. The melt is compressed for the third time in the second compression section 7. The die 60 and the flat part 73 of the core 70 form the forming section 8, and the cross-sectional area of the forming section 8 is constant, so that the melt can form a stable pipe blank.
[0029] The silicon core pipe extrusion die can compress the material for three times, and can effectively eliminate the spiral line on the inner wall of the silicon core pipe. From the flow characteristics, the speed difference between the core layer melt and the outer layer melt in the compression section is large, the speed gradient is obvious, but the pressure drop is weak. In the relatively flat release section, the transition section and the forming section, the speed difference between the core layer melt and the outer layer melt is small, but the shear effect on the core layer melt and the outer layer melt is different, the shear effect on the outer layer melt is serious, and the shear effect on the inner layer melt is relatively weak. The melt expands radially after flowing out of the die, can realize the appropriate shrinkage and compaction of the melt, overcome the problem of delamination of the silicon core layer and the polyethylene outer layer, and the forming section is arranged at the die, so that the silicon core pipe can be well formed. Therefore, the application can be adapted to high-speed extrusion production.
[0030] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and the scope of protection of the present application is defined by the appended claims, the specification and its equivalents.
Claims
1. A silicon core tube high speed extrusion die comprising a first spiral body (20), a second spiral body (30) and an outer die jacket (40), characterized in that: The front end of the outer sleeve (40) is provided with a front sleeve (50) and a die (60), the die (60) is provided with a core die (70) connected to the front of the first spiral body (20), the first spiral body (20) and the second spiral body (30) form a core layer flow channel (3) for conveying the core layer material of the silicon tube, the outer sleeve (40) and the second spiral body (30) form an outer layer flow channel (4) for conveying the outer layer of the silicon tube, the outer sleeve (40) and the first spiral body (20), the front sleeve (50) and the first spiral body (20), and the die (60) and the core die (70) form a confluence flow channel, wherein the confluence flow channel is sequentially provided with a release section (5), a first compression section (6), a second compression section (7) and a forming section (8) from upstream to downstream, the cross-sectional area of the release section (5), the first compression section (6), the second compression section (7) and the forming section (8) decreases in turn, and the cross-sectional area of the release section (5) is greater than the sum of the cross-sectional areas of the core layer flow channel (3) and the outer layer flow channel (4), and the cross-sectional areas of the first compression section (6) and the second compression section (7) gradually decrease from upstream to downstream.
2. The high speed extrusion die for silicon core tubes according to claim 1, characterized in that, The rear end of the outer sleeve (40) is provided with a distributor (10), the distributor (10) is provided with a core layer material flow channel (1), the rear of the first spiral body (20) and the second spiral body (30) are provided with spiral grooves (21), and the rear end of the first spiral body (20) is provided with a plurality of distribution flow channels (2) communicated with the spiral grooves (21).
3. The high speed extrusion die for silicon core tubes according to claim 1, characterized in that, The first spiral body (20) is provided with a first protrusion (22), and the first protrusion (22) is located at the outlet of the core layer flow channel (3).
4. The silicon core tube high speed extrusion die of claim 1, wherein, The second spiral body (30) is provided with a second protrusion (31), and the second protrusion (31) is located at the outlet of the outer layer flow channel (4).
5. The silicon core tube high speed extrusion die of claim 1, wherein, The core die (70) comprises a conical part (71) connected to the front end of the first spiral body (20), a flat part (73) located on the front side of the conical part (71), and a neck part (72) located between the flat part (73) and the conical part (71).
6. The silicon core tube high speed extrusion die of claim 1, wherein, The cross-sectional area of the forming section (8) is equal.
7. The high speed extrusion die for silicon core tubes according to claim 1, characterized in that, A transition section with equal cross-sectional area is arranged between the first compression section (6) and the second compression section (7).