Fire isolation layer fire-proof digital signal cable

Abstract

This invention relates to a new fireproof digital signal cable with fireproof layer. A skin-foam-skin co-extrusion method is used to extrude a PE insulation layer on an oxygen-free copper wire conductor, four insulation wire cores are twisted into a twist winding to be bound with cotton to become wire windings, several of which take twisted to a cable core, an ALOH sizing material is covered on the cable core to form an internal fire-blocking layer winded with a mica-belt fire-proof layer, AlOH sizing material is extruded on the mica-belt fire-proof layer to form an outer fire-blocking layer winded with flame retardant belting to be extruded to a halogen-free low-smoke frame-retardant polyolefin-inner sheathing to be winded with Al plastic composite belt shield layer to be extruded to a halogen-free low-smoke flame-retardant polyolefin outer sheathing.

Description

technical field [0001] The invention relates to a cable structure, in particular to a fire-resistant signal cable, and belongs to the technical field of cables. Background technique [0002] With the advent of the information age, the vigorous development of information technology and the widespread application of electronic computers have become an important symbol of the modernization of rail transit. The track circuit technology as the main body of track communication has updated its concept and expanded its application scope. Computer control and detection technology is used in the track traffic signal system to realize multi-task and multi-information real-time automatic collection and processing, in order to ensure safety. Under the premise, the level of automation and the efficiency of transportation dispatching and commanding should be improved to better meet the requirements of high-speed, efficient and safe operation of rail transit. [0003] At present, urban rai...

AI Technical Summary

Problems solved by technology

Once a fire breaks out in the subway, the power communication system will be interrupted immediately, and the lighting and communication will all be interrupted. This will not only make it difficult for people in the fire to escape from danger, but also bring inconvenience to firefighters in their rescue efforts.

The ground and underground cannot communicate, which virtually increases the accident loss

[0004] The traditional fire-resistant signal cable is composed of conductor, insulation layer, fire-resistant layer, shielding layer and outer sheath. Big

In addition, when the cable is burning, the refractory layer is intact, but the insulating layer (PE material) is completely burned, and the structure of the cable will change, thereby changing the fixed pitch of the wire pair, and the dielectric constant of the cable will also change. , so that the cable cannot guarantee accurate signal transmission when it is burning

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