Flame retardant fire-resistant track traffic signal flexible cable

Abstract

The invention discloses a flame retardant fire-resistant track traffic signal flexible cable, which comprises at least three shielding line sets wrapped by a first polyester band, wherein each of the shielding line sets comprises at least two twisted single lines formed by twisting seven first tinned copper wires; each of the twisted single lines is provided with a single line insulation layer on the external surface; the at least two twisted single lines are wrapped by a second polyester band provided with a line resistance shielding layer; a line resistance insulation layer is wrapped on the external surface of each line resistance shielding layer; and each single line insulation layer is composed of an external single line insulation layer and an internal single line insulation layer; each external single line insulation layer comprises the following materials: 1%-3% of true crosslinked polyethylene and 97%-99% of plastic color masterbatch; and each external line resistance insulation layer comprises synthetic mica paper, of which both sides are covered by fiberglass cloth through silicon resin adhesive layers. The flexible cable provided by the invention can eliminate influences on the electric field by metal particles in the color masterbatch distributed around a conductor, lower transmission attenuation of the cable, and improve the mechanical performances as well as light and thermal ageing resistance of the insulation layers.

Description

technical field [0001] The invention relates to the field of rail traffic signal cables, in particular to a flame-retardant and fire-resistant rail traffic signal flexible cable. Background technique [0002] In rail transit signal systems such as railways, subways, light rails, etc., the signal cables used to transmit rail traffic signals have single-core copper conductors, cable shielding layers are longitudinally wrapped or wrapped with copper tape, and the armoring method of the cables is double. Steel tape wrapping armor. Conventional signal cables do not have the dual functions of flame retardancy and fire resistance. In the signal cable with the above structure, the conductor becomes hard and brittle due to heat, oxidation and other factors during long-term use, causing the end to be easily broken; the structural limitations of the cable make it poor in bending performance and poor in flame and fire resistance. . Contents of the invention [0003] The object of t...

AI Technical Summary

Problems solved by technology

In the signal cable with the above structure, the conductor becomes hard and brittle due to heat, oxidation and other factors during long-term use, causing the end to be easily broken; the structural limitations of the cable make it poor in bending performance and poor in flame and fire resistance.

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