Sheath low-retraction cable for rail transit

Abstract

The invention discloses a sheath low-retraction cable for rail transit. The cable comprises a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a copper wire shielding layer, a waterproof layer and an armor layer, wherein the conductor is sleeved with the conductor shielding layer, the insulation layer, the insulation shielding layer, the copper wire shielding layer, the waterproof layer and the armor layer in sequence from inside to outside. A friction increasing and retraction resisting layer formed by extruding thermoplastic materials is additionally arranged between the insulation shielding layer and the waterproof layer, so that shielding copper wires wrapped in a spiral shape at intervals are embedded into the friction increasing and retraction resisting layer to be a whole, the shielding function of the copper wire layer is not affected, the friction force between the copper wires and the surface of the insulation shielding layer of the cable is increased greatly, the sliding frequency of a sheath of the cable on the copper wire shielding layer is reduced, and therefore the retraction of the sheath of the cable is reduced when temperature changes.

Description

technical field [0001] The invention belongs to the technical field of cables, and in particular relates to a sheathed low-retraction cable for urban rail transit. Background technique [0002] As an important part of the urban public transportation system, there are currently many types of urban rail transit, such as subways, light rails, suburban railways, trams, and suspension trains. With the rapid delivery of my country's economy and the acceleration of urbanization, the urban rail transit industry has entered a period of great development, and the total amount of wires and cables used for urban rail transit is also increasing. At present, cables for rail transit are required to have low-smoke, halogen-free and flame-retardant properties in order to reduce fire losses and injuries to personnel. In order to enable the cable to withstand a large short-circuit current, it is required to use copper wire shielding. When using copper wire shielding, the surface friction betw...

AI Technical Summary

Problems solved by technology

At the same time, in order to make the cable reach the Class A flame retardant level, a large amount of low-smoke and halogen-free organic materials must be used for the sheath. Shrinkage, which adversely affects the use of cables

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