Low-smoke halogen-free locomotive cable

Abstract

The utility model discloses a low-smoke halogen-free locomotive cable, which comprises at least three copper conductors formed by twisting a plurality of copper conductors, the surface of each copper conductor is coated with an insulating layer, a wrapping tape is wrapped on the outer surface of the copper conductor, a copper wire braid layer is wrapped on the outer surface of the wrapping layer, and an inner sheath layer is wrapped on the outer surface of a shielding layer. The surface, opposite to the shielding layer, of the inner sheath layer is coated with a low-smoke halogen-free outer sheath layer. A plurality of raised lines are arranged on the outer surface of the insulating layer of each copper conductor at intervals along the circumferential direction, the plurality of raised lines are arranged on the outer surface of the insulating layer in parallel, and the end surface of each raised line is an arc-shaped surface. According to the low-smoke halogen-free locomotive cable, mutual twisting among the copper conductors in the cable laying, dragging and bending processes can be effectively improved, and internal twisting force in the cable is reduced, so that the service life of the cable is prolonged.

Description

Technical Field

[0001] This utility model relates to a locomotive cable, and more particularly to a low-smoke halogen-free locomotive cable. Background Technology

[0002] With the rapid development of high-speed railways and urban rail transit in my country, the working environment and safety requirements of locomotive and rolling stock cables used in high-speed railways and urban rail vehicles dictate the special characteristics of the cables used. These requirements are often limited to properties such as halogen-free, low-smoke, flame-retardant, low-toxicity, oil-resistant, high and low temperature resistant, and environmentally friendly. Existing locomotive cables often experience significant torque on their copper conductors during laying, dragging, and bending, which affects the cable's service life. Summary of the Invention

[0003] This utility model provides a low-smoke halogen-free locomotive cable, which can effectively improve the mutual torsion between multiple copper conductors during cable laying, dragging and bending, reduce the internal torsion of the cable, and thus help extend the service life of the cable.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a low-smoke halogen-free locomotive cable, comprising at least three copper conductors formed by twisting together several copper wires, the surface of which is covered with an insulating layer, a wrapping tape wrapped around the outer surface of the copper conductor, a copper wire braided layer wrapped around the outer surface of the wrapping layer, and an inner sheath layer wrapped around the outer surface of the shielding layer. The surface of the inner sheath layer opposite to the shielding layer is covered with a low-smoke halogen-free outer sheath layer. Several protrusions are arranged circumferentially at intervals on the outer surface of the insulating layer of each copper conductor, and the protrusions are arranged parallel to each other on the outer surface of the insulating layer. The end face of the protrusions is an arc-shaped surface.

[0005] The relevant content in the above technical solution is explained as follows:

[0006] 1. In the above scheme, the plurality of protrusions are arranged at equal intervals.

[0007] 2. In the above scheme, the number of protrusions on the insulating layer is 6 to 12.

[0008] 3. In the above scheme, the surface of the copper wire is plated with a tin layer.

[0009] 4. In the above scheme, the thickness of the low-smoke halogen-free outer sheath layer is 3 to 5 times the thickness of the inner sheath layer.

[0010] 5. In the above scheme, the number of copper conductors is 3.

[0011] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0012] This utility model relates to a low-smoke halogen-free locomotive cable, wherein each of the copper conductors has a plurality of raised strips arranged circumferentially on the outer surface of the insulation layer. The raised strips are arranged in parallel on the outer surface of the insulation layer, and the end face of the raised strips is an arc-shaped surface. This effectively improves the mutual torsion between multiple copper conductors during cable laying, dragging and bending, reduces the internal torsion of the cable, and thus helps to extend the service life of the cable. Attached Figure Description

[0013] Appendix Figure 1 This is a schematic diagram of the structure of the low-smoke halogen-free locomotive cable of this utility model.

[0014] In the above attached diagram: 1. Copper conductor; 2. Insulation layer; 3. Wrapping layer; 4. Copper wire braided layer; 5. Inner sheath layer; 6. Copper wire; 7. Low smoke halogen-free outer sheath layer; 8. Shielding layer; 9. Raised strip. Detailed Implementation

[0015] The present invention will be further described below with reference to embodiments:

[0016] Example 1: A low-smoke halogen-free locomotive cable includes at least three copper conductors 1 formed by twisting together several copper wires 6. The surface of the copper conductor 1 is covered with an insulation layer 2, a wrapping tape 3 is wrapped around the outer surface of the copper conductor 1, a copper wire braided layer 4 is covered around the outer surface of the wrapping layer 3, and an inner sheath layer 5 is covered around the outer surface of the shielding layer 8. The surface of the inner sheath layer 5 opposite to the shielding layer 8 is covered with a low-smoke halogen-free outer sheath layer 7. This low-smoke halogen-free outer sheath layer is formed by extruding existing cable material through a screw extruder.

[0017] The outer surface of the insulation layer 2 of each copper conductor 1 is provided with a plurality of protrusions 9 spaced apart along the circumference. The plurality of protrusions 9 are arranged in parallel on the outer surface of the insulation layer 2, and the end face of the protrusions 9 is an arc-shaped surface.

[0018] The number of raised strips 9 on the above-mentioned insulating layer 2 is 8.

[0019] The surface of the copper conductor 6 is plated with a tin layer.

[0020] The thickness of the aforementioned low-smoke halogen-free outer sheath layer 10 is 3.5 times the thickness of the inner sheath layer 5.

[0021] Example 2: A low-smoke halogen-free locomotive cable includes at least three copper conductors 1 formed by twisting together several copper wires 6. The surface of the copper conductor 1 is covered with an insulation layer 2, a wrapping tape 3 is wrapped around the outer surface of the copper conductor 1, a copper wire braided layer 4 is covered around the outer surface of the wrapping layer 3, and an inner sheath layer 5 is covered around the outer surface of the shielding layer 8. The surface of the inner sheath layer 5 opposite to the shielding layer 8 is covered with a low-smoke halogen-free outer sheath layer 7. This low-smoke halogen-free outer sheath layer 7 is formed by extruding existing cable material through a screw extruder.

[0022] The outer surface of the insulation layer 2 of each copper conductor 1 is provided with a plurality of protrusions 9 spaced apart along the circumference. The plurality of protrusions 9 are arranged in parallel on the outer surface of the insulation layer 2, and the end face of the protrusions 9 is an arc-shaped surface.

[0023] The aforementioned protrusions 9 are arranged at equal intervals.

[0024] The number of raised strips 9 on the above-mentioned insulating layer 2 is 10.

[0025] The surface of the copper conductor 6 is plated with a tin layer.

[0026] The thickness of the aforementioned low-smoke halogen-free outer sheath layer 10 is four times the thickness of the inner sheath layer 5.

[0027] The number of copper conductors 1 mentioned above is 3.

[0028] When using the above-mentioned low-smoke halogen-free locomotive cable, a number of raised strips are arranged circumferentially on the outer surface of the insulation layer of each copper conductor. The raised strips are arranged parallel to each other on the outer surface of the insulation layer. The end face of the raised strip is an arc-shaped surface, which can effectively improve the mutual torsion between multiple copper conductors during cable laying, dragging and bending, reduce the internal torsion of the cable, and thus help extend the service life of the cable.

[0029] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A low-smoke halogen-free locomotive cable, characterized in that: It includes at least three copper conductors (1) formed by twisting together several copper wires (6). The surface of the copper conductor (1) is covered with an insulating layer (2), a wrapping tape (3) is wrapped around the outer surface of the copper conductor (1), a copper wire braided layer (4) is covered on the outer surface of the wrapping layer (3), and an inner sheath layer (5) is covered on the outer surface of the shielding layer (8). The surface of the inner sheath layer (5) opposite to the shielding layer (8) is covered with a low-smoke halogen-free outer sheath layer (7). The outer surface of the insulating layer (2) of each copper conductor (1) is provided with several protrusions (9) spaced apart circumferentially. The protrusions (9) are arranged in parallel on the outer surface of the insulating layer (2), and the end face of the protrusions (9) is an arc-shaped surface.

2. The low-smoke halogen-free locomotive cable according to claim 1, characterized in that: The plurality of protrusions (9) are arranged at equal intervals.

3. The low-smoke halogen-free locomotive cable according to claim 1, characterized in that: The number of raised strips (9) on the insulating layer (2) is 6 to 12.

4. The low-smoke halogen-free locomotive cable according to claim 1, characterized in that: The surface of the copper conductor (6) is plated with a tin layer.

5. The low-smoke halogen-free locomotive cable according to claim 1, characterized in that: The thickness of the low-smoke halogen-free outer sheath (10) is 3 to 5 times the thickness of the inner sheath (5).

6. The low-smoke halogen-free locomotive cable according to claim 1, characterized in that: The number of copper conductors (1) is 3.

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