Wire structure extrusion discharge device

Abstract

The application relates to a wire material discharging technology field and discloses a wire structure extrusion type discharging device which comprises an extrusion barrel and two extrusion rods, an extrusion space is arranged in the extrusion barrel, the two extrusion rods are adjacently arranged in the extrusion space, a pressure thread is arranged on the extrusion rod, the pressure thread is located on the outer side of the extrusion rod and forms a first stirring section, a second stirring section, a third stirring section and a fourth stirring section, a feeding port and a discharging port are arranged on the extrusion barrel; the plastic particles are pushed and fed and pre-pressed through the feeding small section and the pre-pressing small section on the first stirring section, the plastic particles are rolled and then stirred three times through the rolling small sections and the stirring small sections on the second stirring section, the third stirring section and the fourth stirring section, so that the plastic particles are fully stirred and processed, the mixing efficiency and the extrusion capacity are effectively improved, and the extrusion quality is improved.

Description

Technical Field

[0001] The invention relates to the field of wire feeding technology, and in particular to a wire extrusion feeding device. Background Technology

[0002] In fields such as cable coating, optical fiber coating, and the preparation of 3D printed polymer filaments, extrusion molding technology is a key process for achieving continuous filament production. Among them, melt extrusion is widely used in the production of various thermoplastic filaments due to its mature technology and high production efficiency.

[0003] Currently, the most common equipment in wire rod extrusion production is the single-screw extruder. Single-screw extruders have advantages such as simple structure, low cost, and easy operation, demonstrating good applicability in simple extrusion molding of single materials. However, facing increasingly complex material systems and the production requirements of high-quality wire rods, existing single-screw extrusion equipment has revealed significant shortcomings in several aspects.

[0004] First, insufficient mixing capacity is the most significant inherent drawback of single-screw extruders. Essentially, a single-screw extruder is more of a conveying device than a highly efficient mixing device. Its operating principle relies primarily on a drag flow, resulting in very limited lateral mixing as the material progresses along the helical path, making it difficult to achieve sufficient dispersion and uniform mixing of the melt. When pigments, functional fillers, or other additives need to be added to the wire material, single-screw extruders often fail to effectively promote the uniform dispersion of the filler in the melt. For example, research has reported that in the production of medical sutures using single-screw extruders, due to the short screw stroke and limited mixing effect, pigments cannot be fully mixed with the matrix material, leading to pigment accumulation and color spots in the wire, which can severely affect product performance. As pigments continue to accumulate in the melt, the extrusion pressure continuously increases, exacerbating extrusion bulging, ultimately resulting in a rough wire surface, reduced quality, and the inability to achieve long-term continuous production. In fields requiring efficient dispersion and uniform mixing, such as composite materials, blends, and modified plastics, single-screw extruders often fail to meet process requirements.

[0005] Secondly, poor melt temperature control precision is also a prominent problem faced by existing single-screw extrusion technology. During single-screw extrusion, heat generation is highly dependent on the shear friction between the material and the inner wall of the barrel, easily leading to poor thermal uniformity—the melt temperature near the barrel wall is higher, posing a risk of degradation, while the melt temperature near the screw root is lower. This temperature gradient results in inconsistent melt viscosity, severely affecting the wire diameter uniformity, roundness, and surface quality. For heat-sensitive materials such as low-smoke halogen-free rubber, existing single-screw extrusion devices are also prone to defects such as insufficient plasticization, unstable extrusion pressure due to temperature fluctuations, and non-round appearance during processing.

[0006] Third, the stability of process control is limited. The flow rate of a single-screw extruder is highly sensitive to die pressure; pressure fluctuations directly affect the stability of the extrusion flow rate, leading to fluctuations in wire diameter and inconsistent quality. To suppress pressure fluctuations, existing technologies often employ a series structure of a single screw and a melt pump. However, this not only complicates the equipment but also fails to fundamentally solve the problem of the single screw's inherent sensitivity to pressure fluctuations. Furthermore, when producing wire products with an ultra-wide diameter range, existing single-screw extrusion equipment often requires frequent die changes or adjustments to extrusion process parameters, resulting in low switching efficiency and potential issues with alignment accuracy.

[0007] Fourth, the demand for multi-component materials and multifunctional composite filaments poses greater challenges to existing equipment. In recent years, with the rapid development of FDM 3D printing technology and the widespread application of high-performance engineering plastics (such as PEEK and PEI) in aerospace, biomedicine, and other fields, the demand for composite filaments with high melting points, high mechanical properties, and multifunctional characteristics has been increasing. However, traditional extrusion equipment suffers from significant shortcomings, including limited extrusion raw material selection, inability to perform online material mixing and modification, low extrusion temperature, insufficient extrusion capacity for high-melting-point materials, and poor extrusion quality, which restrict the development and promotion of high-performance composite filaments. Summary of the Invention

[0008] The main objective of the invention is to propose a wire extrusion discharge device, which aims to provide a dual-bar type with strong mixing capability.

[0009] To achieve the above objectives, the invention proposes a wire extrusion discharge device, comprising an extrusion cylinder and two extrusion rods. The extrusion cylinder contains an extrusion space, and the two extrusion rods are arranged adjacent to each other within the extrusion space. Each extrusion rod has an external pressing thread located on its outer side, forming a first stirring section, a second stirring section, a third stirring section, and a fourth stirring section. The extrusion cylinder has an inlet and an outlet, with the inlet located in the first stirring section and the outlet located in the fourth stirring section. The first mixing section includes a feeding section and a pre-compression section. The second, third, and fourth mixing sections each include a grinding section and a mixing section. The feeding section is used to adjust the plastic granules entering from the inlet and deliver them to the pre-compression section. The pre-compression section is used to pre-compress the plastic granules and deliver them to the second mixing section. The second, third, and fourth mixing sections sequentially perform three repeated grinding and mixing operations on the plastic granules through the grinding and mixing sections, and finally extrude them from the outlet.

[0010] Specifically, the external threads of the extrusion bar located on different extrusion bars are staggered with each other.

[0011] Specifically, there is a transition gap between the feeding section and the pre-compression section, and the external thread of the pressing material on the pre-compression section is provided with a pre-compression knife groove.

[0012] Specifically, the grinding section is provided with a number of grinding blades to form the external thread of the pressing material, and each grinding blade is spirally arranged at intervals on the outer surface of the extrusion rod.

[0013] Specifically, the grinding blade includes a blade body and a cutting edge, the blade body and the cutting edge are integrally formed, the blade body is connected to the extrusion rod, the cutting edge is located on the outside of the blade body, and the cutting edge is provided with an inclined cutting surface.

[0014] Specifically, the grinding blade is made of a high-temperature resistant alloy.

[0015] Specifically, the length of the feeding section is greater than the length of the pre-compression section; the length of the grinding section is less than or equal to the length of the mixing section.

[0016] Specifically, the extrusion cylinder includes a first cylinder section, a second cylinder section, a third cylinder section, and a fourth cylinder section. The first cylinder section, the second cylinder section, the third cylinder section, and the fourth cylinder section are connected to each other to form the extrusion space. The feed inlet is located on the first cylinder section, and the discharge outlet is located on the fourth cylinder section.

[0017] Specifically, the extrusion cylinder is provided with a plurality of temperature measuring holes, which are respectively located on the first cylinder section, the second cylinder section, the third cylinder section and the fourth cylinder section.

[0018] The invention's technical solution involves setting two extrusion rods within the extrusion space of the extrusion cylinder. The plastic granules to be processed enter the extrusion space through the feed inlet, and the extrusion rods push and melt the plastic granules. The plastic granules are then pushed, fed, and pre-compressed by the feeding section and pre-compressing section on the first stirring section. Then, the plastic granules undergo three stages of first crushing and then stirring by the grinding section and stirring section on the second, third, and fourth stirring sections. This achieves thorough mixing and processing of the plastic granules, effectively improving mixing efficiency and extrusion capacity, thereby improving extrusion quality. Attached Figure Description

[0019] Figure 1 This is one of the structural schematic diagrams of the assembly state of the invention.

[0020] Figure 2 This is the second structural schematic diagram of the assembly state of the invention.

[0021] Figure 3 This is a three-dimensional structural diagram of the extrusion bar of the invention.

[0022] Figure 4 for Figure 3 An enlarged schematic diagram of point A.

[0023] The reference numerals in the attached drawings include: 10, extrusion cylinder; 11, first cylinder section; 12, second cylinder section; 13, third cylinder section; 14, fourth cylinder section; 15, feed inlet; 16, discharge outlet; 17, temperature measuring hole; 20, extrusion rod; 21, first mixing section; 22, second mixing section; 23, third mixing section; 24, fourth mixing section; 25, feeding section; 26, pre-compression section; 27, grinding section; 28, stirring section; 29, grinding blade. Detailed Implementation

[0024] The technical solutions in the embodiments of the invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, and not all of them. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the invention.

[0025] It should be noted that if the embodiments of the invention involve directional indicators (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of the invention involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by the invention.

[0027] like Figures 1 to 4As shown, a wire extrusion discharge device includes an extrusion cylinder 10 and two extrusion rods 20. The extrusion cylinder 10 has an extrusion space, and the two extrusion rods 20 are arranged adjacent to each other within the extrusion space. Each extrusion rod 20 has an external pressing thread located outside the extrusion rod 20, forming a first stirring section 21, a second stirring section 22, a third stirring section 23, and a fourth stirring section 24. The extrusion cylinder 10 has an inlet 15 and an outlet 16. The inlet 15 is located in the first stirring section 21, and the outlet 16 is located in the fourth stirring section 24. The first stirring section 21 contains… The second mixing section 22 includes a feeding section 25 and a pre-compression section 26. The third mixing section 23 and the fourth mixing section 24 each include a grinding section 27 and a mixing section 28. The feeding section 25 is used to adjust the plastic granules entering from the feed inlet 15 and send them to the pre-compression section 26. The pre-compression section 26 is used to pre-compress the plastic granules and send them to the second mixing section 22. The second mixing section 22, the third mixing section 23 and the fourth mixing section 24 sequentially grind and mix the plastic granules three times through the grinding section 27 and the mixing section 28, and finally extrude them from the discharge outlet 16. During wire extrusion, the plastic granules to be processed enter the extrusion space through the feed inlet 15. The plastic granules first come into contact with the first stirring section 21 of the extrusion bar 20. The feeding section 25 preheats the plastic granules and moves them forward. The preheated plastic granules are pre-pressed by the pre-pressing section 26 and moved forward. The crushing section 27 on the second stirring section 22 crushes the plastic granules and moves them to the mixing section 28. The mixing section 28 then stirs the heated crushed plastic and continues to move it forward to the third stirring section 23. The third stirring section 23 and the fourth stirring section 24 repeatedly crush and stir the plastic granules to ensure that the plastic granules are fully crushed and melted, improve the uniformity of heating of the plastic granules, and thus achieve full mixing and processing of the plastic granules, effectively improving mixing efficiency and extrusion capacity, thereby improving extrusion quality.

[0028] The external threads of the extrusion rods 20 are staggered. In this embodiment, the external threads of the extrusion rods 20 on two adjacent extrusion rods 20 are staggered to improve the crushing and mixing efficiency of the extrusion rods 20, thereby achieving full mixing of the plastic granules and improving the mixing efficiency.

[0029] A transition gap exists between the feeding section 25 and the pre-compression section 26, and a pre-compression knife groove is provided on the external thread of the pressing section 26. In this embodiment, by setting a transition gap between the feeding section 25 and the pre-compression section 26, it is easier to achieve orderly transition of plastic granules, thereby facilitating orderly pre-compression of the plastic granules and further improving pre-compression efficiency.

[0030] The grinding section 27 is provided with a plurality of grinding blades 29 forming a pressing external thread, and the grinding blades 29 are spirally arranged at intervals on the outer surface of the extrusion rod 20. In this embodiment, multiple grinding blades 29 are provided on the grinding section 27, and the size, length, width and inclination angle of each grinding blade 29 are different. The grinding blades 29 are spirally arranged at intervals, which facilitates multi-dimensional grinding of plastic particles and improves grinding efficiency.

[0031] The grinding blade 29 includes a blade body and a cutting edge, which are integrally formed. The blade body is connected to the extrusion rod 20, and the cutting edge is located on the outer side of the blade body, with an inclined cutting surface. In this embodiment, by providing an inclined cutting surface to the cutting edge, it is easier to grind and cut the plastic granules using the grinding blade 29. By using different grinding blades 29 to grind and cut the plastic granules, it is easier to cut plastic granules of different sizes, thereby improving grinding efficiency. In this embodiment, the grinding blade 29 is made of a high-temperature resistant alloy.

[0032] The length of the feeding section 25 is greater than the length of the pre-compression section 26; the length of the grinding section 27 is less than or equal to the length of the mixing section 28. In this embodiment, the length of the feeding section 25 is greater than the length of the pre-compression section 26, which facilitates the sorting of the plastic granules that have just entered the extrusion space, and then pushes them, thus facilitating the orderly entry of the plastic granules into the pre-compression section 26 for pre-compression. At the same time, the length of the grinding section 27 in the second mixing section 22 and the fourth mixing section 24 is less than the length of the mixing section 28, and the length of the grinding section 27 in the third mixing section 23 is greater than the length of the mixing section. By setting the grinding section 27 and the mixing section 28 with different lengths, the grinding time and mixing time of the plastic granules during the processing can be adjusted, thereby improving the mixing efficiency.

[0033] The extrusion cylinder 10 includes a first cylinder section 11, a second cylinder section 12, a third cylinder section 13, and a fourth cylinder section 14. These sections are interconnected to form an extrusion space. An inlet 15 is located on the first cylinder section 11, and an outlet 16 is located on the fourth cylinder section 14. In this embodiment, flanges on the first cylinder section 11, second cylinder section 12, third cylinder section 13, and fourth cylinder section 14 are used to lock the sections together, thus creating an extrusion space within the extrusion cylinder 10 and facilitating the processing of plastic granules.

[0034] The extrusion cylinder 10 is provided with a plurality of temperature measuring holes 17, which are respectively located on the first cylinder section 11, the second cylinder section 12, the third cylinder section 13, and the fourth cylinder section 14. In this embodiment, the extrusion cylinder 10 is provided with temperature measuring holes 17 so as to install temperature measuring probes through the temperature measuring holes 17 to detect the temperature in different cylinder sections, thereby facilitating control and management and improving the mixing and extrusion effect.

[0035] The above description is merely a preferred embodiment of the invention and does not limit the patent scope of the invention. Any equivalent structural transformations made based on the invention concept and the contents of the specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the invention.

Claims

1. A wire extrusion discharge device, comprising an extrusion cylinder and two extrusion rods, characterized in that: The extrusion cylinder has an extrusion space, and two extrusion rods are arranged adjacent to each other in the extrusion space. The extrusion rods are provided with external pressing threads, which are located on the outside of the extrusion rods and form a first mixing section, a second mixing section, a third mixing section, and a fourth mixing section. The extrusion cylinder is provided with an inlet and an outlet. The inlet is located at the first mixing section, and the outlet is located at the fourth mixing section. The first mixing section includes a feeding section and a pre-compression section. The second, third, and fourth mixing sections each include a grinding section and a stirring section. The feeding section is used to adjust the plastic granules entering from the inlet and deliver them to the pre-compression section. The pre-compression section is used to pre-compress the plastic granules and deliver them to the second mixing section. The second, third, and fourth mixing sections sequentially perform three repeated grinding and stirring operations on the plastic granules through the grinding and stirring sections, and finally extrude them from the outlet.

2. The extrusion-type discharge device for wire structure according to claim 1, characterized in that: The external threads of the extrusion bar located on different extrusion bars are staggered with each other.

3. The extrusion-type discharge device for wire structure according to claim 1, characterized in that: There is a transition gap between the feeding section and the pre-compression section, and the external thread of the pressing material on the pre-compression section is provided with a pre-compression knife groove.

4. The extrusion-type discharge device for wire structure according to claim 1, characterized in that: The grinding section is provided with a number of grinding blades to form the external thread of the pressing material, and each grinding blade is spirally arranged at intervals on the outer surface of the extrusion rod.

5. The extrusion-type discharge device for wire structure according to claim 4, characterized in that: The grinding blade includes a blade body and a cutting edge. The blade body and the cutting edge are integrally formed. The blade body is connected to the extrusion rod. The cutting edge is located on the outside of the blade body and has an inclined cutting surface.

6. The extrusion-type discharge device for wire structure according to claim 4, characterized in that: The grinding blade is made of high-temperature resistant alloy.

7. The extrusion-type discharge device for wire structure according to claim 1, characterized in that: The length of the feeding section is greater than the length of the pre-compression section; the length of the grinding section is less than or equal to the length of the mixing section.

8. The extrusion-type discharge device for wire structure according to claim 1, characterized in that: The extrusion cylinder includes a first cylinder section, a second cylinder section, a third cylinder section, and a fourth cylinder section. The first cylinder section, the second cylinder section, the third cylinder section, and the fourth cylinder section are connected to each other to form the extrusion space. The feed inlet is located on the first cylinder section, and the discharge outlet is located on the fourth cylinder section.

9. A wire extrusion discharge device according to claim 8, characterized in that: The extrusion cylinder is provided with a plurality of temperature measuring holes, which are respectively located on the first cylinder section, the second cylinder section, the third cylinder section and the fourth cylinder section.

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