Aluminum alloy core light-weight cable for rail transit vehicle

Abstract

The utility model provides an aluminum alloy core light-weight cable for a rail transit vehicle, which belongs to the technical field of cables and comprises a cable body, the cable body comprises a central framework, a plurality of wire cores are arranged in the central framework, and a rebound auxiliary structure layer is arranged on the central framework. The springback auxiliary structure layer comprises a hollow pipe formed by spiral winding and a plurality of hollow marbles in the hollow pipe, a polyethylene insulating layer is arranged on the springback auxiliary structure layer, a metal shielding layer formed by weaving metal wires is arranged on the polyethylene insulating layer, and a halogen-free low-smoke outer sheath is arranged on the metal shielding layer. In the process of laying the cable at the bottom of the track, the cable can be well rebounded by virtue of the toughness of the cable and the internal acting force after the cable is bent, so that the cable can be conveniently bent back by a worker, later laying and binding by a binding belt are facilitated, and the efficiency of cable laying work is improved.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of cables, in particular to an aluminum alloy core lightweight cable for rail transit vehicles. Background Art

[0002] Cables are generally composed of three parts: conductor, insulation layer and protective layer. They are laid underground, in the air, etc. There are usually two types of cables: power cables and control cables. Power cables are mainly used for the transmission and distribution of electric energy, while control cables are mainly used for measurement, protection, control and other lines. Cables have the characteristics of internal power supply and external insulation.

[0003] Aluminum alloy cable is a new type of power cable invented with AA-8000 series aluminum alloy as conductor, using special pressing process, annealing treatment and other advanced technologies. The alloy power cable makes up for the shortcomings of pure aluminum cables in the past, improves the cable's electrical conductivity, bending performance, creep resistance and corrosion resistance, etc., and can ensure that the cable maintains continuous and stable performance when overloaded and overheated for a long time. The conductivity of aluminum alloy is 61.5% of the most commonly used benchmark material copper IACS, and the current carrying capacity is 79% of copper, which is better than the pure aluminum standard, but at the same volume, the actual weight of aluminum alloy is about one-third of copper.

[0004] At present, in the process of laying cables at the bottom of the track, a large force is needed to drive the cables to move, and the cables often need to be bent to pull the cables for laying. Sometimes, due to excessive strength of the workers, the cables cannot be bent back well after being bent, which is not conducive to the subsequent laying and binding with cable ties. It is very inconvenient and reduces the efficiency of cable laying work. Utility Model Content

[0005] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technologies. Specifically, the present invention mainly provides an aluminum alloy core lightweight cable for rail transit vehicles, which is used to solve the technical problem mentioned in the above background technology that during the process of laying cables at the bottom of the track, the cables often need to be bent. If the bending range is too large, the cables cannot be bent back well, which is inconvenient for subsequent laying.

[0006] The technical solution adopted by the utility model to solve the above technical problems is:

[0007] A lightweight rail transit vehicle cable with an aluminum alloy core comprises a cable body, wherein the cable body comprises a central skeleton, a plurality of wire cores are arranged in the central skeleton, a rebound auxiliary structural layer is arranged on the central skeleton, the rebound auxiliary structural layer comprises a hollow tube formed by spiral winding and a plurality of hollow balls in the hollow tube, a polyethylene insulating layer is arranged on the rebound auxiliary structural layer, a metal shielding layer formed by braiding metal wires is arranged on the polyethylene insulating layer, and a halogen-free low-smoke outer sheath is arranged on the metal shielding layer.

[0008] Furthermore, the central skeleton includes a middle portion and two arc-shaped portions, each of the arc-shaped portions is provided with a positioning groove, and the positioning groove and the hollow tube cooperate with each other.

[0009] Furthermore, two through holes are arranged on the middle part, and an anti-torsion wire is arranged in each of the through holes.

[0010] Furthermore, the cross-sectional radius of the rebound auxiliary structural layer is greater than the sum of the cross-sectional radius of the polyethylene insulating layer and the metal shielding layer.

[0011] Furthermore, each of the wire cores comprises an insulating inner sleeve and an aluminum alloy conductor in the insulating inner sleeve.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model realizes that in the process of laying cables at the bottom of the track, after the cables are bent, the cables can rely on their own toughness and the mutual squeezing force between the hollow balls in the hollow tube to promote better rebound of the cables, which is beneficial for workers to bend them back and convenient for later laying and binding with cable ties, thereby improving the efficiency of cable laying work. Moreover, the hollow tubes and hollow balls are hollow inside, which better meets the demand for lightweight aluminum alloy cables. The utility model has a simple structure and is easy to process, and has certain practical value.

[0014] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the overall structure decomposition of the utility model;

[0017] Figure 3 It is a schematic diagram of the internal cross section of the hollow tube of the utility model.

[0018] In the figure: 1. Cable body; 11. Central skeleton; 111. Middle part; 112. Arc-shaped part; 113. Positioning groove; 114. Through hole; 12. Wire core; 121. Insulating inner sleeve; 122. Aluminum alloy conductor; 13. Resilient auxiliary structural layer; 131. Hollow tube; 132. Hollow marble; 14. Polyethylene insulation layer; 15. Metal shielding layer; 16. Halogen-free low-smoke outer sheath; 17. Anti-torsion wire. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the present invention, the present invention will be described in more detail below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0020] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly connected by technicians in the technical field of the present invention. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] Please refer to the attached Figure 1-3 A lightweight rail transit vehicle cable with an aluminum alloy core includes a cable body 1, wherein the cable body 1 includes a central skeleton 11, and the central skeleton 11 is injection molded, wherein a plurality of wire cores 12 are arranged in the central skeleton 11, and a rebound auxiliary structural layer 13 is arranged on the central skeleton 11, wherein the rebound auxiliary structural layer 13 includes a spirally wound hollow tube 131 and a plurality of hollow marbles 132 in the hollow tube 131, a polyethylene insulating layer 14 is arranged on the rebound auxiliary structural layer 13, a metal shielding layer 15 woven from metal wires is arranged on the polyethylene insulating layer 14, and a halogen-free low-smoke outer sheath 16 is arranged on the metal shielding layer 15.

[0023] Through the above structure, it is achieved that in the process of laying cables at the bottom of the track, after bending the cables, the cables can rebound well by virtue of their own toughness and internal force, which is beneficial for the workers to bend them back and facilitate the subsequent laying and binding with cable ties, thereby improving the efficiency of the cable laying work. In addition, the structure is simple, the processing is convenient, and it has certain practical value.

[0024] Please refer to the attached Figure 2 and attached Figure 3 The central skeleton 11 includes a middle portion 111 and two arc-shaped portions 112, each of which is provided with a positioning groove 113, and the positioning groove 113 and the hollow tube 131 cooperate with each other. Through the positioning groove 113, it is convenient to position in the process of wrapping the hollow tube 131, so that each part of the hollow tube 131 has the same spacing, which is convenient for good force rebound when the cable is laid. Two through holes 114 are provided on the middle portion 111, and each of the through holes 114 is provided with a torsion-resistant wire 17. Through the torsion-resistant wire 17, the torsion-resistant rebound effect of the cable is further improved. The cross-sectional radius of the rebound auxiliary structural layer 13 is greater than The sum of the cross-sectional radii of the polyethylene insulation layer 14 and the metal shielding layer 15 is achieved through the polyethylene insulation layer 14 and the metal shielding layer 15 to improve the overall insulation capacity and anti-interference ability of the cable. Each of the cores 12 includes an insulating inner sleeve 121 and an aluminum alloy conductor 122 in the insulating inner sleeve 121. The use of the aluminum alloy conductor 122 to replace the copper cable can reduce the weight of the cable, reduce the installation cost, reduce the wear of equipment and cables, and make the installation work easier. Under the premise of meeting the same electrical performance, the weight of the aluminum alloy cable is half of that of the copper core cable, and its cross-section is 1.1~1.25 times that of the traditional copper core cable, and the price is 30%~50% lower than that of the traditional copper core cable.

[0025] The above description of the utility model in combination with the accompanying drawings is an exemplary description. Obviously, the specific implementation of the utility model is not limited to the above-mentioned method. As long as the non-substantial improvements are made by adopting the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A lightweight rail transit vehicle cable with an aluminum alloy core, comprising a cable body (1), characterized in that: The cable body (1) comprises a central skeleton (11), a plurality of wire cores (12) are arranged in the central skeleton (11), a resilient auxiliary structural layer (13) is arranged on the central skeleton (11), the resilient auxiliary structural layer (13) comprises a hollow tube (131) formed by spiral winding and a plurality of hollow marbles (132) in the hollow tube (131), a polyethylene insulating layer (14) is arranged on the resilient auxiliary structural layer (13), a metal shielding layer (15) formed by braiding metal wires is arranged on the polyethylene insulating layer (14), and a halogen-free low-smoke outer sheath (16) is arranged on the metal shielding layer (15).

2. The aluminum alloy core lightweight rail transit vehicle cable according to claim 1, characterized in that: The central skeleton (11) comprises a middle portion (111) and two arc-shaped portions (112), each of the arc-shaped portions (112) being provided with a positioning groove (113), and the positioning groove (113) and the hollow tube (131) cooperate with each other.

3. The aluminum alloy core lightweight rail transit vehicle cable according to claim 2, characterized in that: Two through holes (114) are provided on the middle portion (111), and an anti-torsion wire (17) is provided in each of the through holes (114).

4. The aluminum alloy core lightweight rail transit vehicle cable according to claim 1, characterized in that: The cross-sectional radius of the rebound auxiliary structural layer (13) is greater than the sum of the cross-sectional radii of the polyethylene insulating layer (14) and the metal shielding layer (15).

5. The aluminum alloy core lightweight rail transit vehicle cable according to claim 1, characterized in that: Each of the wire cores (12) comprises an insulating inner sleeve (121) and an aluminum alloy conductor (122) in the insulating inner sleeve (121).

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