Adjustment-free extrusion tube type mold for BVVB cable

Abstract

The utility model relates to the technical field of extrusion tube type dies, and discloses an adjustment-free extrusion tube type die for a BVVB cable, which comprises a cable core assembly space, a die sleeve is arranged on the outer wall of the cable core assembly space, the cable core assembly space is connected in the die sleeve in a sliding manner, a tungsten steel core is fixedly connected in the die sleeve, and the tungsten steel core is fixedly connected in the die sleeve. The outer wall of the cable core assembly space is provided with a dividing gap, the outer wall of the cable core assembly space is provided with a tubular bearing diameter, the outer wall of the tubular bearing diameter is provided with a bearing diameter sizing gap, the dividing gap is arranged between the cable core assembly space and the mold core, and the cable core assembly space is internally provided with a plurality of insulating wire cores which are arranged in parallel. According to the BVVB cable extrusion die, through the structure of the separation gap, the tubular bearing diameter, the die sleeve and the like, in the production process, plastic can be evenly extruded at the gap, the relative position of the die core and the die sleeve cannot be affected, the situation that an extrusion layer is eccentric is avoided, and high-quality production of a BVVB cable is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of tube extrusion dies, in particular to an adjustment-free tube extrusion die for a BVVB cable. Background Art

[0002] BVVB cable is a multi-core copper conductor cable commonly used in home and building electrical wiring. It is a stable, safe, reliable and affordable home and building electrical wiring cable. BVVB cable is widely used in home and building electrical wiring for indoor fixed installation. The production of this cable usually requires the use of extrusion molds.

[0003] The traditional tube extrusion mold includes a mold sleeve and a mold core. The extrusion end of the mold core forms a tubular diameter-bearing part. The cable core passes through the tubular diameter-bearing part. A space for plastic extrusion is formed between the mold sleeve and the mold core. Due to the existence of the tubular diameter-bearing part of the mold core, the plastic is not directly pressed on the wire core, but moves forward along the tubular diameter-bearing part, first forming a tube, and then being stretched to be wrapped around the wire core of the wire.

[0004] The inner wall of the diameter-bearing part (inner and outer walls) of the core of this tube extrusion die and the inner wall of the sizing part of the die sleeve are both round. When the BVVB sheath is extruded, a tube is formed, which is round. The round tube will be close to the insulating core through stretching, but the round tube cannot be stretched to a completely horizontal middle part. There will be an arc-shaped bulge in the middle part of the outer sheath, resulting in poor cable surface appearance and large outer diameter. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides an adjustment-free tube extrusion die for BVVB cable, aiming to improve the problem that when the traditional tube extrusion die extrude the BVVB sheath, the middle part of the outer sheath will have an arc-shaped bulge, resulting in poor cable surface appearance and large outer diameter.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a non-adjustable extrusion tube mold for BVVB cable, comprising a cable core assembly space, a mold sleeve is provided on the outer wall of the cable core assembly space, the cable core assembly space is slidably connected to the inside of the mold sleeve, a tungsten steel core is fixedly connected to the inside of the mold sleeve, the outer wall of the cable core assembly space is provided with a partition gap, the outer wall of the cable core assembly space is provided with a tubular bearing diameter, and the outer wall of the tubular bearing diameter is provided with a bearing diameter determining gap.

[0007] Furthermore, the partition gap is arranged between the cable core assembly space and the mold core.

[0008] Furthermore, a plurality of insulating cores are arranged in parallel inside the cable core assembly space.

[0009] Furthermore, the tubular bearing diameter is arranged inside the flat mold core.

[0010] Furthermore, the bearing diameter determining gap is arranged between the tubular bearing diameter of the mold core and the mold sleeve.

[0011] Furthermore, the die sleeve is arranged on the outer wall of the sizing gap.

[0012] Furthermore, the partition gap is arranged on the outer wall of the cable core assembly space.

[0013] Furthermore, the mold sleeve is arranged on the outer wall of the tubular bearing diameter.

[0014] The utility model has the following beneficial effects:

[0015] 1. In the utility model, the mold core and the mold sleeve are first installed in the mold base to form a whole. That is, during the production process, the relative positions of the mold core and the mold sleeve will not be affected, and the eccentricity of the extrusion layer is avoided, thereby ensuring the production quality of the BVVB cable.

[0016] 2. In the utility model, through its adjustment-free tube extrusion structure, the tubular diameter-bearing part of the mold core and the sizing part of the mold sleeve are flat in shape, and the shape of the extruded tube and the BVVB cable are consistent, so that a BVVB cable with good appearance can be obtained by stretching. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic cross-sectional view of a mold sleeve of an adjustment-free tube extrusion mold for a BVVB cable proposed in the utility model;

[0018] Figure 2 The utility model is a side view of a mold sleeve of an adjustment-free tube extrusion mold for a BVVB cable.

[0019] Legend:

[0020] 1. Cable core assembly space; 2. Partition gap; 3. Tubular bearing diameter; 4. Bearing diameter sizing gap; 5. Die sleeve; 6. Tungsten steel core. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Reference Figure 1 and Figure 2The utility model provides an embodiment: a non-adjustable extrusion tube mold for a BVVB cable, comprising a cable core assembly space 1, a mold sleeve 5 is arranged on the outer wall of the cable core assembly space 1, the cable core assembly space 1 is slidably connected inside the mold sleeve 5, a tungsten steel core 6 is fixedly connected inside the mold sleeve 5, a partitioning gap 2 is arranged on the outer wall of the cable core assembly space 1, a tubular bearing diameter 3 is arranged on the outer wall of the cable core assembly space 1, and a bearing diameter sizing gap 4 is arranged on the outer wall of the tubular bearing diameter 3.

[0023] Specifically, the partition gap 2 refers to the gap between the cable core assembly space 1 and the mold core, which is intended to provide sufficient stretching space for plastic stretching. The tubular bearing diameter 3 is designed to be flat, and the bearing diameter sizing gap 4 is the gap between the tubular bearing diameter 3 and the sizing part of the mold sleeve 5, which is used to form a tubular structure of the plastic. This design makes the shape of the stretched plastic sheath consistent with the shape of the cable and has a smooth surface, which solves the problem of poor cable appearance. In addition, a certain distance between the rear part of the mold core bearing diameter and the rear part of the mold sleeve 5 bearing diameter helps to extrude the plastic evenly here without affecting the relative position of the mold core and the mold sleeve 5. This design avoids the eccentricity of the extrusion layer and ensures the high-quality production of BVVB cables during the production process.

[0024] Reference Figure 2 The partitioning gap 2 is arranged between the cable core assembly space 1 and the mold core, a plurality of insulating cores are arranged in parallel inside the cable core assembly space 1, a tubular bearing diameter 3 is arranged inside the flat mold core, a bearing diameter determining gap 4 is arranged between the tubular bearing diameter 3 of the mold core and a mold sleeve 5, the mold sleeve 5 is arranged on the outer wall of the bearing diameter determining gap 4, the partitioning gap 2 is arranged on the outer wall of the cable core assembly space 1, and the mold sleeve 5 is arranged on the outer wall of the tubular bearing diameter 3.

[0025] Specifically, in this structure, the tungsten steel core 6 embedded in the mold sleeve 5 has the characteristics of wear resistance and high smoothness, which improves the durability and appearance quality of the cable. The flat tube extrusion mold is composed of a mold sleeve 5 and a mold core. The tubular bearing diameter 3 in the mold core is provided with a tube hole inside for extruding plastic. During extrusion, the end face of the mold core is kept parallel to the end face of the mold sleeve 5, ensuring the accuracy of the shape and size of the extruded plastic.

[0026] Working principle: the partition gap 2 is the gap between the cable core assembly space 1 and the diameter-bearing part of the mold core, which provides stretching space for plastic stretching. The tubular diameter-bearing 3 is flat. The diameter-bearing sizing gap 4 is the gap between the tubular diameter-bearing 3 part of the mold core and the sizing part of the mold sleeve 5. The plastic is formed into a tube here. The shape of the tube is consistent with the shape of the cable, and the upper and lower surfaces are flat. Therefore, after stretching, the cable sheath is formed. This structure solves the problem of poor cable appearance. At the same time, the tungsten steel core 6 embedded in the mold sleeve 5 has the characteristics of wear resistance and high smoothness. The flat tube extrusion mold includes a mold sleeve 5 and a mold core. The mold core includes a tubular bearing diameter 3, which is a part of the mold core. A tube hole is arranged inside the tubular bearing diameter 3. During tube extrusion, the end face of the mold core is flush with the end face of the mold sleeve 5. There is a certain distance between the rear part of the mold core bearing diameter and the rear part of the mold sleeve 5 bearing diameter, which is convenient for extruding plastic here. This structure will not affect the relative position of the mold core and the mold sleeve 5 during the production process, avoids the eccentricity of the extrusion layer, and ensures the production quality of the BVVB cable.

[0027] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A non-adjustable tube extrusion die for a BVVB cable, comprising a cable core assembly space (1), characterized in that: The outer wall of the cable core assembly space (1) is provided with a mold sleeve (5), the cable core assembly space (1) is slidably connected to the inside of the mold sleeve (5), a tungsten steel core (6) is fixedly connected to the inside of the mold sleeve (5), the outer wall of the cable core assembly space (1) is provided with a partitioning space (2), the partitioning space (2) is arranged between the cable core assembly space (1) and the mold core; the outer wall of the cable core assembly space (1) is provided with a tubular bearing diameter (3) of the mold core, the tubular bearing diameter (3) is flat, and the tubular The outer wall of the diameter bearing (3) is provided with a diameter-determining gap (4), and the diameter-determining gap (4) is provided between the tubular diameter bearing (3) of the mold core and the mold sleeve (5). The diameter-determining gap (4) is the gap between the tubular diameter bearing (3) part of the mold core and the sizing part of the mold sleeve (5). A tube hole is provided inside the tubular diameter bearing (3). During tube extrusion, the end face of the mold core is flush with the end face of the mold sleeve (5), and a distance is provided between the rear part of the diameter bearing of the mold core and the rear part of the diameter bearing of the mold sleeve (5).

2. The adjustment-free tube extrusion die for BVVB cable according to claim 1, characterized in that: A plurality of insulating wire cores are arranged in parallel inside the cable core assembly space (1).

3. The adjustment-free tube extrusion die for BVVB cable according to claim 2, characterized in that: The tubular bearing diameter (3) is arranged inside the flat mold core.

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