Scratch-resistant cable extrusion die

Abstract

The utility model discloses a kind of scratch-proof cable extrusion moulds, including mould core and mould cover, the cavity that has through its both ends is in mould cover, mould core is set in cavity, the top end of mould cover is opened with one end opening installation slot, the die opening coaxial with inner die body is opened on inner die body, inner die body is located in installation slot, cover plate is detachably installed in the opening of installation slot, the both end surface of inner die body is equipped with respectively with the convex ring of the flushness of cavity inner wall and cover plate outer surface. The detachable structure of installation slot, inner die body and cover plate is combined with the inner die body of the mould cover of stainless steel and nylon or polytetrafluoroethylene material in the application, so as to improve the durability and heat resistance of the mould cover under the premise of placing extrusion layer trace, and can be replaced when needing to replace, and then the loss of parts is reduced, and the cost of production is reduced;The inner die body of different die opening inner diameter can be selected according to the outer diameter of cable, to adapt to the extrusion of cable of different outer diameter.

Description

Technical Field

[0001] This utility model relates to the field of extrusion molds, and in particular to a scratch-resistant cable extrusion mold. Background Technology

[0002] The cable manufacturing process may involve multiple extrusion steps, where heated raw materials are extruded and coated onto the outside of the cable to provide fire resistance, insulation, and protection. Currently, extrusion dies are typically made of metal, such as stainless steel. However, metal dies have high hardness, while the extruded material is very soft. This can cause marks (scratches or abrasions) to remain on the extruded layer. These marks can affect subsequent cable processing, and if the marks are too deep, they can even affect the cable's insulation performance. Furthermore, the inner wall of the metal extrusion die wears down over time, further deepening the marks. Grinding the inner wall of the metal extrusion die requires high precision, resulting in low efficiency and high cost. To address the shortcomings of metal extrusion dies, nylon is now being used. While nylon is softer than metal and less prone to leaving marks on the extruded layer, its high-temperature resistance and wear resistance are far inferior to metal. This leads to a high replacement frequency for nylon extrusion dies, increasing production and maintenance costs. To address the above issues, an extrusion die is needed that can prevent marks during extrusion and increase durability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a scratch-resistant cable extrusion mold.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model discloses a scratch-resistant cable extrusion die, comprising a die core and a die sleeve. The die sleeve has a cavity extending through both ends. The die core is fitted into the cavity. The die sleeve also includes an inner die body and a cover plate. The top end of the die sleeve has an open mounting groove. The inner die body has a die orifice coaxial with the inner die body and is disposed within the mounting groove. The cover plate is detachably installed at the opening of the mounting groove and has an inner ring coaxially disposed thereon. The two end surfaces of the inner die body have protruding rings that are flush with the inner wall of the cavity and the outer surface of the cover plate, respectively. The two protruding rings communicate with the die orifice and maintain the same inner diameter, so that the extruded cable passes through the die orifice and the protruding rings at both ends.

[0005] As a preferred embodiment of this utility model, the mounting groove is provided with a plurality of threaded sleeves, the inner mold body is provided with a plurality of through holes adapted to the threaded sleeves, and the threaded sleeves can pass through the corresponding through holes. The cover plate is provided with countersunk holes of the same number as the threaded sleeves, and is threadedly connected to the corresponding threaded sleeves by bolts provided in the countersunk holes, so that the cover plate is installed at the opening of the mounting groove and fixes the inner mold body in the mounting groove.

[0006] As a preferred technical solution of this utility model, the mounting groove is provided with a plurality of limiting posts, the inner mold body is provided with a plurality of through holes adapted to the limiting posts, and the limiting posts can pass through the corresponding through holes. The inner side of the outer edge of the cover plate is provided with internal threads, the outer surface of the mold sleeve is provided with internal threads, and the cover plate is threadedly connected to the mold sleeve through internal threads and external threads, and fixes the inner mold body in the mounting groove.

[0007] As a preferred embodiment of this utility model, the mold core, the mold sleeve, and the cover plate are all made of iron or stainless steel, and the inner mold body and the convex ring are all made of nylon or polytetrafluoroethylene.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. The stainless steel mold sleeve and the inner mold body made of nylon or polytetrafluoroethylene are combined by a detachable structure consisting of a mounting groove, an inner mold body and a cover plate. This improves the durability and heat resistance of the mold sleeve without leaving traces of the extrusion layer. When replacement is needed, the inner mold body can be replaced, thereby reducing the wear of parts and lowering the production cost. 2. Inner molds with different inner diameters can be selected according to the outer diameter of the cable to accommodate the extrusion of cables with different outer diameters. Attached Figure Description

[0009] 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 the front view of this utility model; Figure 3 This is a top view of the present invention; Figure 4 This is an exploded view of one embodiment of the present invention; Figure 5 This is an exploded view of another embodiment of the present invention; In the diagram: 1. Mold core; 2. Mold sleeve; 3. Cavity; 4. Inner mold body; 5. Mold opening; 6. Through hole; 7. Convex ring; 8. Mounting groove; 9. Threaded sleeve; 10. Limiting post; 11. Cover plate; 12. Inner ring; 13. Countersunk hole. Detailed Implementation The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0010] In the attached diagram, all identical reference numerals refer to the same components.

[0011] Example 1 like Figure 1-4 As shown, this utility model provides a scratch-resistant cable extrusion mold, including a mold core 1 and a mold sleeve 2. The mold sleeve 2 has a cavity 3 extending through both ends. The mold core 1 is fitted inside the cavity 3. It also includes an inner mold body 4 and a cover plate 11. The top end of the mold sleeve 2 has an open mounting groove 8. The inner mold body 4 has a die orifice 5 coaxial with the inner mold body 4. The inner mold body 4 is located in the mounting groove 8. The cover plate 11 is detachably installed at the opening of the mounting groove 8 and has an inner ring 12 coaxially arranged on it. The two end surfaces of the inner mold body 4 have protruding rings 7 that are flush with the inner wall of the cavity 3 and the outer surface of the cover plate 11, respectively. The two protruding rings 7 communicate with the die orifice 5 and maintain the same inner diameter so that the extruded cable passes through the die orifice 5 and the protruding rings 7 at both ends.

[0012] Furthermore, the mold core 1, mold sleeve 2, and cover plate 11 are all made of iron or stainless steel, while the inner mold body 4 and the convex ring 7 are made of nylon or polytetrafluoroethylene.

[0013] Specifically, mold core 1 and mold sleeve 2 are existing technologies in this field and will not be described in detail here; Using iron or stainless steel for the die core 1, die sleeve 2, and cover plate 11 ensures the overall strength of the extrusion die and provides a longer service life, reducing the cost increase caused by frequent replacements. The inner mold body 4 and the convex ring 7, made of nylon or polytetrafluoroethylene, are relatively soft and can prevent marks (scratches or abrasions) from appearing on the extruded layer of the cable. When the service life is reached, only the inner mold body 4 can be replaced instead of the entire mold sleeve 2, thereby reducing the replacement cost. The cover plate 11 has a certain thickness. After the cover plate 11 is put on, there will be a distance between the surface of the inner mold body 4 and the outer surface of the cover plate 11. Similarly, there is also a distance between the inner mold body 4 and the inner surface of the cavity 3. Therefore, the protruding ring 7 is needed to fill the above distance to prevent the extruded layer from directly contacting the cavity 3 or the cover plate 11.

[0014] Example 2: like Figure 4As shown, further, the mounting groove 8 is provided with multiple threaded sleeves 9, and the inner mold body 4 is provided with multiple through holes 6 that are adapted to the threaded sleeves 9, so that the threaded sleeves 9 can pass through the corresponding through holes 6. The cover plate 11 is provided with countersunk holes 13 in the same number as the threaded sleeves 9, and is threadedly connected to the corresponding threaded sleeves 9 by bolts provided in the countersunk holes 13, so that the cover plate 11 is installed at the opening of the mounting groove 8 and fixes the inner mold body 4 in the mounting groove 8.

[0015] Specifically, in this embodiment, the number of threaded sleeves 9 is preferably 2-4, and the number of through holes 6 is the same as the number of threaded sleeves 9. When the inner mold body 4 is placed into the mounting groove 8, a threaded sleeve 9 passes through each through hole 6 to limit the inner mold body 4 and prevent the inner mold body 4 from shifting during installation. After the cover plate 11 is placed on top, it is connected to the corresponding threaded sleeve 9 by bolts installed in the countersunk hole 13, so that the cover plate 11 covers the opening of the mounting groove 8 and fixes the inner mold body 4 in the mounting groove 8.

[0016] Example 3: like Figure 5 As shown, further, the mounting groove 8 is provided with multiple limiting posts 10, and the inner mold body 4 is provided with multiple through holes 6 that are adapted to the limiting posts 10, so that the limiting posts 10 can pass through the corresponding through holes 6. The inner side of the outer edge of the cover plate 11 is provided with internal threads, and the outer surface of the mold sleeve 2 is provided with internal threads. The cover plate 11 is threadedly connected to the mold sleeve 2 through internal threads and external threads, and fixes the inner mold body 4 in the mounting groove 8.

[0017] Specifically, in this embodiment, the cover plate 11 (similar to the structure of a bottle cap) is threadedly connected to the mold sleeve 2 to fix the inner mold body 4 in the mounting groove 8. This method is simpler and faster than that of embodiment 1. An anti-slip layer can be provided on the outer surface of the cover plate 11 to prevent slipping when tightening or loosening the cover plate 11. It is best to have 2-4 limiting posts 10. The number of through holes 6 is the same as the number of limiting posts 10. When the inner mold body 4 is placed into the mounting groove 8, the limiting post 10 passes through each through hole 6 to limit the inner mold body 4 and prevent the inner mold body 4 from shifting during installation.

[0018] Example 4: Because the outer diameter of the cables is different, different inner diameter mold sleeves 2 are required during the extrusion process. In the existing technology, the entire mold sleeve 2 usually needs to be replaced. Therefore, it is necessary to prepare all the inner diameter mold sleeves 2 required for production, which greatly increases the procurement or manufacturing cost of the mold sleeve 2.

[0019] In this embodiment, inner molds 4 with different inner diameters can be purchased or manufactured as needed, and only the inner molds 4 can be replaced as needed to adapt to the extrusion requirements of cables with different outer diameters, thereby reducing costs.

[0020] Example 5: Since polytetrafluoroethylene (PTFE) is more expensive than nylon, a PTFE layer can be applied to the inner walls of the mold opening 5 and the two protruding rings 7 of the nylon inner mold body 4, thereby reducing the cost of the inner mold body 4.

[0021] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are 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. A scratch-resistant cable extrusion die, comprising a die core (1) and a die sleeve (2), wherein the die sleeve (2) has a cavity (3) extending through both ends thereof, and the die core (1) is fitted within the cavity (3), characterized in that, It also includes an inner mold body (4) and a cover plate (11). The top end of the mold sleeve (2) has an open mounting groove (8). The inner mold body (4) has a die opening (5) coaxial with the inner mold body (4). The inner mold body (4) is located in the mounting groove (8). The cover plate (11) is detachably installed at the opening of the mounting groove (8) and has an inner ring (12) coaxially arranged on it. The two ends of the inner mold body (4) are provided with convex rings (7) that are flush with the inner wall of the cavity (3) and the outer surface of the cover plate (11), respectively. The two convex rings (7) are connected to the die opening (5) and have the same inner diameter so that the extruded cable passes through the die opening (5) and the convex rings (7) at both ends.

2. The anti-scratch cable extrusion die according to claim 1, characterized in that, The mounting groove (8) is provided with a plurality of threaded sleeves (9), and the inner mold body (4) is provided with a plurality of through holes (6) that are adapted to the threaded sleeves (9), so that the threaded sleeves (9) can pass through the corresponding through holes (6). The cover plate (11) is provided with countersunk holes (13) in the same number as the threaded sleeves (9), and is threadedly connected to the corresponding threaded sleeves (9) by bolts provided in the countersunk holes (13), so that the cover plate (11) is installed at the opening of the mounting groove (8) and fixes the inner mold body (4) in the mounting groove (8).

3. The anti-scratch cable extrusion die according to claim 1, characterized in that, The mounting groove (8) is provided with multiple limiting posts (10), and the inner mold body (4) is provided with multiple through holes (6) that are adapted to the limiting posts (10), so that the limiting posts (10) can pass through the corresponding through holes (6). The inner side of the outer edge of the cover plate (11) is provided with internal threads, and the outer surface of the mold sleeve (2) is provided with internal threads. The cover plate (11) is threadedly connected to the mold sleeve (2) through internal and external threads, and fixes the inner mold body (4) in the mounting groove (8).

4. A scratch-resistant cable extrusion die according to any one of claims 1-3, characterized in that, The mold core (1), the mold sleeve (2) and the cover plate (11) are all made of iron or stainless steel, and the inner mold body (4) and the convex ring (7) are both made of nylon or polytetrafluoroethylene.

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