A low-smoke, halogen-free, anti-interference railway digital signal cable

Abstract

The invention discloses a low-smoke halogen-free anti-interference digital signal cable for a railway. The low-smoke halogen-free anti-interference digital signal cable comprises multiple core wires, wherein each core wire comprises four conductors formed by star-shaped stranding, and single-sided aluminum and plastic composite tapes wrapped outside all the four conductors, plastic layer surfaces of the single-sided aluminum and plastic composite tapes face outwards, aluminum metal layer surface of the single-sided aluminum and plastic composite tapes face inwards, each conductor comprises a wire positioned in the center, and a low-density polyethylene inner skin layer, a physical foaming polyolefin foaming layer and a polypropylene outer skin layer which are sequentially wrapped outside the wire, the multiple core wires are symmetrically and longitudinally arranged in parallel for forming a cable core, a wrapping layer is wrapped outside the cable core, a first armoring layer is wrapped outside the wrapping layer, an isolating layer is wrapped outside the first armoring layer, a second armoring layer is wrapped outside the isolating layer, a sheathing layer is wrapped outside the second armoring layer, the second armoring layer is formed by longitudinally wrapping metal hollow pipes which are densely arranged, the sheathing layer is made of low-smoke halogen-free cross-linked polyolefin, and the first armoring layer and the second armoring layer are made of different kinds of metal. The low-smoke halogen-free anti-interference digital signal cable for the railway provided by the invention is resistant to moisture and corrosive, good in shielding performance and good in tensile strength and bending resistance and has anti-flaming low-smoke environment-protecting effects.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a low-smoke, halogen-free and anti-interference railway digital signal cable. Background technique [0002] For a long time, due to the lack of material and structure, the tensile strength and bending resistance of cables in the railway industry are difficult to meet the requirements of use, and the damage has caused communication failures. [0003] There are two directions for the development of railway locomotives today. One is to use high-speed bullet trains for passenger transportation, and the other is to use long-term marshalling for heavy-duty traction. High-speed trains and heavy-duty traction put forward higher requirements for safety and comfort. In the production process of existing inner shielded railway digital signal cables, the usual low-smoke, halogen-free and anti-interference railway digital signal cables use plastic sheathing. Set of low-smoke, zero-halogen, an...

AI Technical Summary

Problems solved by technology

The shielding is mainly wrapped around or longitudinally. The inner shielded railway digital signal cables produced by these two methods often have quality problems such as copper tape leakage or cracking at the seam of the copper tape. The discontinuity of the shielding body and the non-conductive gap formed at the junction of different parts of the shielding body will cause electromagnetic leakage, which seriously affects the shielding performance of the cable and poses a major safety hazard to railway transportation

Therefore, the shielding of the cable is not ideal, and when the interference is serious, it will cause distortion of signal transmission

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