High-flame-retardancy railway signal cable

Abstract

The invention provides a high-flame-retardancy railway signal cable. The high-flame-retardancy railway signal cable comprises a cable core and a protection layer which wraps the cable core, wherein the cable core comprises at least one wire group; the wire group comprises four insulating single wires which are arranged in a twisted mode in four different colors; each insulating single wire is composed of a conductor, an inner insulating layer, an outer insulating layer, a high-flame-retardant wrapping tape layer and a comprehensive sheath; the periphery of the four insulating single wires belonging to the same wire group is wrapped by a binding yarn, an inner-side non-hygroscopic insulating layer, a first shielding layer and an outer-side non-hygroscopic insulating layer in sequence from inside to outside; and the protection layer comprises a cable core wrapping tape layer, a first buffer layer, a second shielding layer, a second buffer layer, a steel strip armor layer and an outer sheath which are sequentially arranged from inside to outside. The high-flame-retardancy railway signal cable has reliable service life, and excellent thermal stability, moisture resistance, flame retardancy and high temperature resistance and is capable of bearing large radiation dose.

Description

technical field [0001] The invention belongs to the technical field of the cable industry, and in particular relates to a high flame-retardant railway signal cable. Background technique [0002] With the repeated speed-up of railways, cables are required not only to have general characteristics, but also to have the properties of anti-cracking, halogen-free, low-smoke, flame-retardant, and long life, as well as specific environmental resistance. At present, catastrophic natural disasters occur more and more frequently, and the fires and nuclear safety caused by them should arouse people's reflection. [0003] As the central nervous system of the railway, the railway signal cable is generally laid along the track on the edge of the track. The cable has been working in such an occasion for a long time. Most of the cable insulation and sheath cannot withstand the strong radiation requirements, or the cable will be blocked in case of fire after laying. The flame performance can...

AI Technical Summary

Problems solved by technology

[0003] As the central nervous system of the railway, the railway signal cable is generally laid along the track on the edge of the track. The cable has been working in such an occasion for a long time. Most of the cable insulation and sheath cannot withstand the strong radiation requirements, or the cable will be blocked in case of fire after laying. The flame performance cannot meet the requirements of on-site disaster relief, especially the cables with poor flame retardancy will extinguish for a long time after burning, which will bring great difficulties to disaster relief work and cause greater damage and loss.

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