Preparation process of rail transit cable

Abstract

The invention discloses a preparation process of a rail transit cable. The preparation process of the rail transit cable comprises the steps of (1) conductor drawing; (2) conductor stranding; (3) insulating layer extrusion; (4) preparation of a metal shielding layer outside an insulating wire core; (5) gap filling; and (6) sheath extrusion. The rail transit cable disclosed by the invention has good low-smoke, halogen-free and flame-retardant performance, and is high in temperature resistance level (125 DEG C) and excellent in environmental aging resistance. The cable shielding layer adopts a double-layer shielding structure, thereby being capable of effectively suppressing the occurrence of crosstalk. Meanwhile, the rail transit cable adopts tinned copper wire and aramid fiber braiding, thereby being capable of bearing influences of strong external tension to a certain extent, and playing a role of protecting core wires. The effect of the tensile strength is more prominent especially for cables with a small cross section in the connecting part. The sheath layer of the cable is made of a nylon sheath, and the high wear resistance of the sheath can effectively prevent cable damages caused by friction.

Description

technical field [0001] The invention relates to the technical field of rail transit cables, in particular to a preparation process for rail transit cables. Background technique [0002] In the 21st century, my country has become the main exporter of rail vehicle technology. As one of the main accessories, the cables for rail vehicles have also fully realized their own autonomy; as an indispensable transmission link in the electrical system of rail vehicles, the cable reliability and The requirements for durability are becoming higher and higher under the trend of technological renewal of rail transit; compared with polyolefin materials, ethylene-propylene rubber has better electrical insulation performance, weather resistance and ozone resistance, and also has softness. It is one of the ideal materials for cable insulation. [0003] Elastomer materials, such as TPV, TPE, TPU, etc., which have both the softness of rubber materials and the processing characteristics of plastics...

AI Technical Summary

Problems solved by technology

[0004] The existing insulated rail transit cables use the continuous steam vulcanization pipeline production process, which not only has complex processes and high energy consumption, but also has high requirements for plant design and manufacturing equipment, and requires a large investment, especially for manufacturing personnel. Very high technical level

Since the sulfur pipeline is closed when starting up, the appearance of the cable cannot be observed intuitively, so the product quality is difficult to control, the yield rate is low, and the manufacturing waste is great. It is even more difficult to produce small-section cables, and the durability The temperature level can only reach 90°C, which is not conducive to the production of insulated rail transit vehicle cables