Double-color extrusion die for wires and cables

Abstract

The utility model discloses an electric wire and cable double-color extrusion die which comprises a die core and a die sleeve, the die sleeve is provided with a feeding channel in the radial direction, the inner end of the feeding channel is in a horn shape with the narrow upper portion and the wide lower portion, the die sleeve is provided with a feeding port, the feeding port is communicated with the feeding channel, a valve is installed on the feeding port, and the outer end of the feeding channel is a cylindrical hole. The feeding channel is provided with a feeding port, the middle of the feeding channel is provided with a cylindrical step, the inner end of the feeding channel is provided with a flat horn mouth, the die core is of a cone frustum structure, the top end of the feeding port is integrally provided with a flange plate, and the flange plate is provided with a plurality of through holes. Therefore, the size of the flat horn mouth of the feeding channel can be changed, the flow of the flat horn mouth of the feeding channel can be dynamically changed according to the outer diameter of the cable core, the extruded double-color cable core can meet the national standard requirement, the use is more flexible, the die sleeve does not need to be replaced, and the universality is high.

Description

Technical Field

[0001] The utility model relates to the technical field of wire and cable extrusion dies, and particularly relates to a two-color extrusion die for wires and cables. Background Art

[0002] It is stipulated in the national standard GB 5023 that for the two-color cores of wires and cables, at least 30% but not more than 70% of the surface of the insulated core should be covered by one color, and the other color should cover the remaining part of the insulated core. At present, one of the two-color extrusion methods for wires and cables is the form of a strip injection machine plus a single machine. The strip injection machine injects the auxiliary color material, and the single machine extrudes the main color material. The die consists of a die core, a die sleeve and a feeding channel. However, due to the limitation of the aperture size of the feeding channel connecting the die sleeve of the strip injection machine, when producing cores of different specifications, the coverage of the auxiliary color on the surface of the insulated core is often less than 30%, especially when the core specification is large, it is even less than 15%, which does not meet the national standard requirements.

[0003] The Chinese utility model patent with the publication number CN201340763Y discloses a two-color extrusion die for wires and cables, including a die core and a die sleeve, characterized in that: the die sleeve is radially provided with a feeding channel, and the inner end of the feeding channel is in the shape of a trumpet with a narrow upper part and a wide lower part. The outer end of the feeding channel is a cylindrical hole, the middle is a cylindrical step, and the inner end is a flat trumpet m. The main color material is extruded from the gap between the die core and the die sleeve, and the auxiliary color material is extruded from the feeding channel. The die core is in the shape of a frustum of a cone.

[0004] The above patent has the following deficiencies:

[0005] Although the coverage of the auxiliary color on the surface of the insulated core can reach 30% and 50%, the aperture of the feeding channel is fixed. Therefore, when different coverage ratios of the auxiliary color on the surface of the insulated core are required, the die sleeve with a different feeding channel aperture needs to be replaced, so the versatility of the die is poor. Content of the Utility Model

[0006] In view of the problems existing in the existing two-color extrusion die for wires and cables, the present utility model is proposed.

[0007] Therefore, the purpose of the present utility model is to provide a two-color extrusion die for wires and cables, which solves the problem that although the coverage of the auxiliary color on the surface of the insulated core can reach 30% and 50%, the aperture of the feeding channel is fixed. Therefore, when different coverage ratios of the auxiliary color on the surface of the insulated core are required, the die sleeve with a different feeding channel aperture needs to be replaced, so the versatility of the die is poor.

[0008] To solve the above technical problems, according to one aspect of the present utility model, the following technical solutions are provided:

[0009] A two-color extrusion die for wire and cable, comprising a die core and a die sleeve. The die sleeve is radially provided with a feeding channel, and the inner end of the feeding channel is in the shape of a trumpet with a narrow upper part and a wide lower part. The die sleeve is provided with a feeding port, the feeding port is communicated with the feeding channel, and a valve is installed on the feeding port.

[0010] As a preferred scheme of the two-color extrusion die for wire and cable of the present utility model, wherein: the outer end of the feeding channel is a cylindrical hole, the middle is a cylindrical step, and the inner end is a flat trumpet-shaped opening.

[0011] As a preferred scheme of the two-color extrusion die for wire and cable of the present utility model, wherein: the die core is in the structure of a frustum of a cone.

[0012] As a preferred scheme of the two-color extrusion die for wire and cable of the present utility model, wherein: a flange is integrally provided at the top end of the feeding port, and a plurality of through holes are provided on the flange.

[0013] As a preferred scheme of the two-color extrusion die for wire and cable of the present utility model, wherein: the width of the flat trumpet-shaped opening is at least set to 12.8 mm.

[0014] Compared with the prior art:

[0015] By providing a feeding port on the feeding channel and a valve on the feeding port, the flow rate of the feeding channel can be changed, so that the size of the flat trumpet-shaped opening of the feeding channel can be dynamically changed according to the outer diameter of the wire core, so as to ensure that the extruded two-color wire core meets the national standard requirements. Therefore, it is more flexible to use and does not require replacement of the die sleeve, so it has strong versatility. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram provided by the present utility model;

[0017] Figure 2 is provided by the present utility model Figure 1 front elevation sectional view;

[0018] Figure 3 is a top view of the feeding port provided by the present utility model;

[0019] Figure 4 is a schematic diagram of the existing wire and cable extrusion die provided by the present utility model.

[0020] In the figure: die core 1, die sleeve 2, feeding channel 3, feeding port 4, flange 41, valve 42. Detailed Embodiment

[0021] To make the purpose, technical solution and advantages of the present utility model clearer, the following will further describe the embodiments of the present utility model in detail with reference to the drawings.

[0022] The present utility model provides a two-color extrusion die for wire and cable. Please refer to Figures 1-3 , which includes a die core 1 and a die sleeve 2. The die sleeve 2 is radially provided with a feeding channel 3. The inner end of the feeding channel 3 is in a trumpet shape with a narrower upper part and a wider lower part. The die sleeve 2 is provided with a feeding port 4. The feeding port 4 is coaxially distributed with the feeding channel 3, and the feeding port 4 is communicated with the feeding channel 3. A valve 42 is installed on the feeding port 4 to adjust the size of the flat trumpet opening of the feeding channel 3, so as to dynamically change the flow rate of the flat trumpet opening of the feeding channel according to the outer diameter of the wire core, thereby ensuring that the extruded two-color wire core meets the national standard requirements, and thus it is more flexible to use.

[0023] The outer end of the feeding channel 3 is a cylindrical hole, the middle is a cylindrical step, and the inner end is a flat trumpet opening. The width of the flat trumpet opening is at least set to 12.8 mm.

[0024] The die core 1 is in a frustum of a cone structure.

[0025] The top end of the feeding port 4 is integrally provided with a flange 41, and a plurality of through holes are provided on the flange 41.

[0026] The surface of the secondary color covering the insulating wire core is 30%:

[0027] The two-color extrusion die for wire and cable is composed of a die core 1 and a die sleeve 2. The die core 1 is in a frustum of a cone structure and is fitted with the die sleeve 2. The die sleeve 2 is radially provided with a feeding channel 3. The outer end of the feeding channel 3 is a cylindrical hole, there is a cylindrical step in the middle, and the inner end is a flat trumpet opening; it is known that the outer diameter of the conductor before extrusion is 10.0 mm and the insulation thickness is 1.4 mm. Then the outer diameter of the wire core after extrusion is 12.8 mm, and the surface of the secondary color material covering the insulating wire core is 30%, that is, the included angle between the center of the wire core and both sides of the trumpet opening is 108°. Through trigonometric calculation, the width of the trumpet opening is 10.4 mm, and actually 10.0 mm can be taken.

[0028] Example 2: The surface of the secondary color covering the insulating wire core is 50%:

[0029] The two-color extrusion die for wire and cable is composed of a die core 1 and a die sleeve 2. The die core 1 is in a frustum of a cone structure and is fitted with the die sleeve 2. The die sleeve 2 is radially provided with a feeding channel 3. The outer end of the feeding channel 3 is a cylindrical hole, there is a cylindrical step in the middle, and the inner end is a flat trumpet opening; it is known that the outer diameter of the conductor before extrusion is 10.0 mm and the insulation thickness is 1.4 mm. Then the outer diameter of the wire core after extrusion is 12.8 mm, and the surface of the secondary color material covering the insulating wire core is 50%, that is, the included angle between the center of the wire core and both sides of the trumpet opening is 180°. Through trigonometric calculation, the width of the trumpet opening is 12.8 mm, and actually 12.0 mm can be taken.

[0030] Although the present utility model has been described above with reference to the embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present utility model. In particular, as long as there is no structural conflict, the various features in the disclosed embodiments of the present utility model can be combined with each other in any way, and the exhaustive description of these combinations is not given in this specification only for the consideration of saving space and resources. Therefore, the present utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A two-color extrusion die for wire and cable, comprising a die core (1) and a die sleeve (2). The die sleeve (2) is radially provided with a feeding channel (3), and the inner end of the feeding channel (3) is in a horn shape with a narrow upper part and a wide lower part. It is characterized in that: The die sleeve (2) is provided with a feed inlet (4), the feed inlet (4) is communicated with the feeding channel (3), and a valve (42) is installed on the feed inlet (4).

2. The two-color extrusion die for wire and cable according to claim 1, characterized in that, The outer end of the feeding channel (3) is a cylindrical hole, the middle is a cylindrical step, and the inner end is a flat flaring opening.

3. The two-color extrusion die for wire and cable according to claim 1, wherein, The die core (1) is of a frustum of a cone structure.

4. A two-color extrusion die for wire and cable according to claim 1, characterized in that, The top end of the feed inlet (4) is integrally provided with a flange (41), and a plurality of through holes are provided on the flange (41).

5. A two-color extrusion die for wire and cable according to claim 2, characterized in that, The width of the flat flaring opening is at least set to 12.8 mm.

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