An extrusion pipe mold produced by strip color injection molding

Abstract

The utility model relates to an extrusion pipe type mould of strip injection color separation extrusion production, include: inner mould, middle mould and outer mould, the first wire hole is set up along the length axial penetration in the inner mould inside, the second wire hole is set up along the length axial penetration in the middle mould inside, and the inner mould is embedded in the second wire hole, the outside wall of middle mould is set up along the length axial and has introduced the groove, the third wire hole is set up along the length axial penetration in the inner mould inside, and the middle mould is embedded in the third wire hole, and the first wire hole, the second wire hole and the third wire hole are coaxial arrangement, the inner side wall of outer mould and the flow passage are formed between the introduced groove, the injection port is set up along the length axial penetration on the side wall of outer mould, and the injection port is opposite one end of flow passage, and the other end of flow passage is connected with the third wire hole, the utility model combines cable extrusion mould and strip injection color separation mould into a whole, has reduced the cost of mould production, secondly can cooperate movable outer hanging type extrusion machine, has promoted production flexibility, can conveniently produce strip injection color separation plastic layer.

Description

Technical Field

[0001] This utility model relates to the field of power cable manufacturing technology, and in particular to an extrusion die for injection molding of color-separated extrusion tubes. Background Technology

[0002] The color-coded plastic layer on cable strips is crucial for effectively distinguishing phase wires, contributing to the uniformity and standardization of electrical installations. This is important not only during construction but also for subsequent maintenance and repairs.

[0003] In existing technologies, the production of color-separated plastic layers using injection molding requires an injection molding die head and a color-separating ring, along with a fixed auxiliary machine for extrusion. The material is melted and plasticized by the auxiliary machine and injected into the injection molding die head. After being rectified by the color-separating ring, it is fused with the main color material and extruded. In the early stages of production, a dedicated die head and a matching distributor are required. The processing of the die head and distributor is not only time-consuming and costly, but the production process also relies on the fixed auxiliary machine, which is limited by the fixed equipment layout and makes it difficult to flexibly adjust the equipment position. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the shortcomings of high production cost and poor flexibility of the existing injection molding color separation mold.

[0005] To solve the above-mentioned technical problems, this utility model provides an extrusion die for strip color separation extrusion production, comprising:

[0006] The inner mold has a first wire-passing hole that extends through its interior along its length axis;

[0007] The middle mold has a second wire-passing hole that extends through its interior along its length axis, and the inner mold is embedded in the second wire-passing hole; the outer wall of the middle mold has a drainage groove that extends along its length axis.

[0008] An outer mold has a third through hole extending through its length axially. A middle mold is embedded in the third through hole. The first, second, and third through holes are coaxially arranged. A flow channel is formed between the inner sidewall of the outer mold and the flow channel. An injection port is provided through the sidewall of the outer mold, with one end of the injection port facing the flow channel and the other end of the flow channel communicating with the third through hole.

[0009] In one embodiment of this utility model, a first carding platform is provided inside the second wire hole, and the end face of the inner mold abuts against the first carding platform.

[0010] In one embodiment of this utility model, a second carding platform is provided inside the third wire hole, and the end face of the middle mold abuts against the second carding platform.

[0011] In one embodiment of this utility model, a positioning pin is provided inside the third wire hole, and a limiting groove that cooperates with the positioning pin is provided on the outer side of the middle mold.

[0012] In one embodiment of the present invention, the bottom of the drainage channel is provided with a slope along the axial direction, and the depth of the drainage channel at one end near the injection port is greater than the depth of the other end.

[0013] In one embodiment of this utility model, the width of the drainage groove at the end near the injection port is smaller than the width at the other end.

[0014] In one embodiment of this utility model, the input end of the first wire hole is provided with a first taper, the input end of the second wire hole is provided with a second taper, and the input end of the third wire hole is provided with a third taper, and the inclination angles of the first taper, the second taper, and the third taper are all the same.

[0015] In one embodiment of this utility model, the first taper, the second taper, and the third taper are arranged consecutively, and the first taper, the second taper, and the third taper are in the same plane.

[0016] In one embodiment of this utility model, the outer diameter of the inner mold is equal to the inner diameter of the second through hole.

[0017] In one embodiment of this utility model, the outer diameter of the intermediate mold is equal to the inner diameter of the third through hole.

[0018] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0019] The present invention relates to an extrusion die for producing color-separated injection molding strips. This invention integrates the cable extrusion die and the color-separated injection molding strip die into one unit, reducing the cost of die manufacturing. Secondly, it can be used with a mobile external extruder, eliminating the dependence on a fixed auxiliary extruder and injection molding strip die head, greatly improving production flexibility, and enabling convenient and efficient production of color-separated injection molding strip plastic layers. Attached Figure Description

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0021] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0022] Figure 2 for Figure 1 Structural cross-sectional view of the inner mold;

[0023] Figure 3 for Figure 1 Structural sectional view of the middle mold;

[0024] Figure 4 for Figure 1 Top view of the structure of the medium-sized mold;

[0025] Figure 5 for Figure 1 Structural cross-sectional views of the inner and outer molds;

[0026] Figure 6 for Figure 1 Side view of the structure of the inner and outer molds;

[0027] Explanation of reference numerals in the accompanying drawings: 1. Inner mold; 2. Middle mold; 3. Outer mold; 4. Runner; 11. First through hole; 12. First taper; 21. Second through hole; 22. Drain groove; 23. First retaining plate; 24. Second taper; 25. Limiting groove; 31. Third through hole; 32. Injection port; 33. Positioning pin; 34. Second retaining plate; 35. Third taper. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0029] Reference Figures 1-6 As shown, this utility model discloses an extrusion die for color-separated injection molding, comprising:

[0030] Inner mold 1, wherein a first wire-passing hole 11 is provided through the inner mold 1 along its length axis;

[0031] The middle mold 2 has a second wire-passing hole 21 that extends through its interior along its length axis, and the inner mold 1 is embedded in the second wire-passing hole 21; the outer wall of the middle mold 2 has a drainage groove 22 that extends along its length axis.

[0032] The outer mold 3 has a third wire guide hole 31 that extends through its interior along its length axis. The middle mold 2 is embedded in the third wire guide hole 31. The first wire guide hole 11, the second wire guide hole 21, and the third wire guide hole 31 are coaxially arranged. A flow channel 4 is formed between the inner sidewall of the outer mold 3 and the flow channel 22. An injection port 32 is provided through the sidewall of the outer mold 3. The injection port 32 is directly opposite one end of the flow channel 4, and the other end of the flow channel 4 is connected to the third wire guide hole 31.

[0033] The color-separation mold for injection molding in this utility model comprises three parts: an inner mold 1, a middle mold 2, and an outer mold 3. The inner mold 1 is nested inside the middle mold 2, and the middle mold 2 is nested inside the outer mold 3. Specifically, the inner mold 1, the middle mold 2, and the outer mold 3 are all provided with through holes, and the first through hole 11, the second through hole 21, and the third through hole 31 are coaxially arranged for the passage of the cable core during actual use. The inner mold 1 is located on the innermost side as a sizing mold to limit the diameter of the entire wire harness. The flow channel 22 on the middle mold 2 is arranged axially along the entire length of the middle mold 2 to allow molten plastic to pass through. A sealed flow channel 4 is formed between the flow channel 22 and the third through hole 31. The outer mold 3 has an injection port 32 on its side, which facilitates the connection of a movable external extruder during use. After the molten plastic is injected from the injection port 32, it flows through the flow channel 4 into the third through hole 31 and then adheres to the surface of the cable core, forming an injection molding strip on the surface of the cable core.

[0034] This invention integrates the cable extrusion mold and the injection molding color separation mold into one unit, reducing the cost of mold making; secondly, it can be used with a mobile external extruder, eliminating the dependence on a fixed auxiliary extruder and injection molding head, greatly improving production flexibility, and enabling convenient and efficient production of injection molding color separation plastic layers.

[0035] Furthermore, referring to Figure 3 As shown, a first carding platform 23 is provided inside the second wire hole 21, and the end face of the inner mold 1 abuts against the first carding platform 23.

[0036] Specifically, during the actual assembly process, the end face of the inner mold 1 is fitted against the first clamping platform 23 to restrict the axial displacement of the inner mold 1 and to position the inner mold 1. Secondly, the outer diameter of the inner mold 1 is equal to the inner diameter of the second wire-passing hole 21, ensuring a tight fit between the inner mold 1 and the second wire-passing hole 21.

[0037] Similarly, refer to Figure 5 As shown, a second retaining platform 34 is provided inside the third wire-passing hole 31, and the end face of the intermediate mold 2 abuts against the second retaining platform 34. During actual assembly, the end face of the intermediate mold 2 is fitted against the second retaining platform 34 to restrict the axial displacement of the intermediate mold 2 and to position it. Furthermore, the outer diameter of the intermediate mold 2 is equal to the inner diameter of the third wire-passing hole 31, ensuring a tight fit between the intermediate mold 2 and the third wire-passing hole 31.

[0038] Furthermore, referring to Figure 6 As shown, a positioning pin 33 is provided inside the third wire hole 31, and a limiting groove 25 that cooperates with the positioning pin 33 is provided on the outer side of the middle mold 2.

[0039] Specifically, the limiting groove 25 is set along the axial direction of the surface of the middle mold 2. In the actual assembly process, the side of the middle mold 2 with the limiting groove 25 is aligned with the limiting groove 25 in the third through hole 31. Then, the positioning pin 33 is inserted into the limiting groove 25 to restrict the rotation of the middle mold 2 and ensure that the injection port 32 and the runner 4 are in the same position.

[0040] Furthermore, referring to Figure 3 As shown, the bottom of the drainage channel 22 is sloped along the axial direction, and the depth of the drainage channel 22 near the injection port 32 is greater than the depth of the other end.

[0041] Specifically, in the actual injection molding process, the pressure is greater at the end with a larger depth, which can ensure that the molten plastic flows out smoothly from the other end of the runner 4.

[0042] Furthermore, referring to Figure 4 As shown, the width of the drainage groove 22 at one end near the injection port 32 is smaller than the width at the other end.

[0043] Specifically, the widths of the two ends of the entire drainage channel 22 are different. The overall structure is such that the width of one end of the injection port 32 is smaller than the width of the other end. In actual use, the size of the outlet end of the drainage channel 22 can be adjusted according to different injection strip ratios. The larger the size, the larger the proportion of injection strips extruded on the surface of the cable core.

[0044] Furthermore, referring to Figure 1 As shown, the input end of the first wire hole 11 is provided with a first taper 12, the input end of the second wire hole 21 is provided with a second taper 24, and the input end of the third wire hole 31 is provided with a third taper 35, and the tilt angles of the first taper 12, the second taper 24 and the third taper 35 are all the same.

[0045] By observing the axial sectional view of the entire injection molding die, it can be seen that the opening on the input side of the die is larger than the opening on the output side. This allows the material flow direction and pressure to be determined after the die core is fitted. Secondly, the equal taper of the first taper 12, the second taper 24, and the third taper 35 reduces the resistance to material input, preventing melt decomposition or thermal degradation due to excessive local pressure. Furthermore, the dimensional change from the input to the output port creates a pressure gradient, ensuring uniform melt flow within the die.

[0046] Furthermore, the first taper 12, the second taper 24, and the third taper 35 are arranged consecutively, and the first taper 12, the second taper 24, and the third taper 35 are in the same plane.

[0047] Specifically, the first taper 12, the second taper 24, and the third taper 35 are set consecutively to further improve the uniformity of melt flow, ensure that the surface of the product after extrusion is uniform and smooth, and improve product quality.

[0048] In summary, this utility model introduces an extrusion die for producing color-separated injection molding strips. The extrusion die of this utility model is used for producing color-separated injection molding strip plastic layers. The die adopts a unique three-section nested structure design, consisting of an outer die 3, a middle die 2, and an inner die 1. The plastic raw material for injection molding strips is melted using a movable external extruder. The molten plastic is injected into the die through the injection port of the outer die 3, then flows into the runner 4, forming color strips of a specific ratio during this process, perfectly fitting the main color material. Subsequently, after integration and sizing by the inner die 1, the molten plastic is finally transformed into a uniform cross-section. This utility model integrates the cable extrusion die and the color-separated injection molding strip die into a single unit, which can be used with a movable external extruder, eliminating the dependence on a fixed auxiliary extruder and injection molding strip die head, greatly improving production flexibility, and enabling convenient and efficient production of color-separated injection molding strip plastic layers.

[0049] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A type of extrusion mold for color-separated injection molding, characterized in that, include: The inner mold has a first wire-passing hole that extends through its interior along its length axis; The middle mold has a second wire-passing hole that extends through its interior along its length axis, and the inner mold is embedded in the second wire-passing hole; the outer wall of the middle mold has a drainage groove that extends along its length axis. An outer mold has a third through hole extending through its length axially. A middle mold is embedded in the third through hole. The first, second, and third through holes are coaxially arranged. A flow channel is formed between the inner sidewall of the outer mold and the flow channel. An injection port is provided through the sidewall of the outer mold, with one end of the injection port facing the flow channel and the other end of the flow channel communicating with the third through hole.

2. The extrusion die for strip color separation extrusion production according to claim 1, characterized in that: The second wire hole is provided with a first carding platform inside, and the end face of the inner mold abuts against the first carding platform.

3. The extrusion die for strip color separation extrusion production according to claim 1, characterized in that: The third wire hole is provided with a second carding platform inside, and the end face of the middle mold abuts against the second carding platform.

4. The extrusion die for strip color separation extrusion production according to claim 1, characterized in that: The third through hole is provided with a positioning pin inside, and the outer side of the middle mold is provided with a limiting groove that cooperates with the positioning pin.

5. The extrusion die for color separation extrusion production according to claim 1, characterized in that: The bottom of the drainage channel is sloped along the axial direction, and the depth of the drainage channel at the end near the injection port is greater than the depth at the other end.

6. The extrusion die for color separation extrusion production according to claim 1, characterized in that: The width of the drainage channel at the end closest to the injection port is smaller than the width at the other end.

7. The extrusion die for strip color separation extrusion production according to claim 1, characterized in that: The input end of the first wire guide hole is provided with a first taper, the input end of the second wire guide hole is provided with a second taper, and the input end of the third wire guide hole is provided with a third taper, and the inclination angles of the first taper, the second taper, and the third taper are all the same.

8. The extrusion die for color separation extrusion production according to claim 7, characterized in that: The first taper, the second taper, and the third taper are arranged consecutively, and the first taper, the second taper, and the third taper are in the same plane.

9. The extrusion die for color separation extrusion production according to claim 1, characterized in that: The outer diameter of the inner mold is equal to the inner diameter of the second through hole.

10. The extrusion die for color separation extrusion production according to claim 1, characterized in that: The outer diameter of the intermediate mold is equal to the inner diameter of the third through hole.

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