Novel aluminum sheath railway signal cable with shielding thermal insulation layer

Abstract

The invention provides a novel aluminum sheath railway signal cable with a shielding thermal insulation layer. The novel aluminum sheath railway signal cable comprises a cable core, and an insulation belt wrapping layer, a conductive shielding thermal insulation layer, an aluminum sheath, an anticorrosive coating, an inner covering, an armored layer and an oversheath which are successively arranged from the inside to the outside outside the cable core. The cable core is formed by intertwisting a plurality of backup insulation single wires, a plurality of twisted pair wires and a plurality of quads; each twisted pair wire is formed by twisting two insulation single wires; each quad is formed by twisting four insulation single wires; the insulation single wires are composed of copper conductors and polyethylene insulation layers which closely wrap the copper conductors; and a flow discharge copper lead is embedded in the conductive shielding thermal insulation layer. According to the railway signal cable provided by the invention, the conductive shielding thermal insulation layer has a thermal insulation effect, at the same time has certain shielding performance, the arranged flow discharge copper lead facilitates construction grounding of the conductive shielding layer, the thickness of the aluminum sheath can be made thinner, the cable realizes a light weight, the bending radius is smaller, and the laying is facilitated.

Description

technical field [0001] The invention belongs to the technical field of cables, in particular to a novel aluminum sheathed railway signal cable with a shielding and heat insulating layer. Background technique [0002] The existing aluminum-sheathed railway signal cable is wrapped with a non-hygroscopic insulation tape layer around the cable core, extruded a layer of vinyl insulation layer outside the insulation tape layer, and the polyethylene heat insulation layer is longitudinally wrapped and sealed by welding. Aluminum sheath, coated with an anti-corrosion layer on the outside of the aluminum sheath and extruded a polyethylene inner liner, the polyethylene inner liner is wrapped with a double steel tape armor layer, and finally a layer is extruded outside the armor layer Polyethylene outer sheath. The aluminum sheath in the aluminum sheathed railway signal cable of this structure generates a lot of heat during the welding process, so a thicker heat insulation layer is set...

AI Technical Summary

Problems solved by technology

The aluminum sheath in the aluminum sheathed railway signal cable of this structure generates a lot of heat during the welding process, so a thicker heat insulation layer is set to play a protective role. At the same time, in order to meet the shielding performance of the cable, the thickness of the aluminum sheath Thicker, the cable has a larger bending radius, and is bulky, making it difficult to lay

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