Leakage coaxial cable of lapped braided outer conductor and production technology thereof

Abstract

The invention relates to a leakage coaxial cable of a lapped braided outer conductor and a production technology thereof. The cable is formed by an internal conductor, an insulating layer, an outer conductor and an outer-coating layer from inside to outside and in a multilayer structure. An inner thin layer, which is used for bonding the internal conductor and the insulating layer and has waterproof and moistureproof functions, is arranged between the internal conductor and the insulating layer. The outer-coating layer is in a double-layer structure and is composed of an inner protection layer and an outer protection layer; more particularly, the inner protection layer is manufactured by continuous enclosed extrusion processing by polymer sheathing compounds with weather ability; and the outer protection layer is manufactured by the continuous enclosed extrusion processing by flame-retardant polymer sheathing compounds. Besides, a water-blocking layer, which is formed by smoothly lapping the outer conductor with a layer of thin polyester film or a water-blocking yarn and has moistureproof and anticorrosion functions, is arranged between the inner protection layer and the outer protection layer of the outer-coating layer; and the outer conductor is formed on the insulating layer by uniformly lapping and braiding a plurality of sparse metal wires along a same direction.

Description

【Technical field】 [0001] The invention relates to a transmission cable in the field of mobile communication, in particular to a leaky coaxial cable with excellent bending performance and a metal wire wrapped braided outer conductor and a production process thereof. 【Background technique】 [0002] In recent years, the country has paid more and more attention to the safety of coal mines. According to the data provided by the State Administration of Work Safety, 90% of coal mines in my country are small coal mines, with problems such as backward production technology and insufficient safety investment. The State Administration of Work Safety has repeatedly issued documents requiring coal mines to be upgraded. Most of the traditional coal mine underground communication is concentrated in the frequency band around 60MHz, and a few use the frequency band around 150MHz, using analog voice communication, which is difficult to meet the growing integrated services such as mine car wir...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional leaky coaxial cable in China is the leaky coaxial cable with corrugated copper tube peak cutting and slotting or copper tape longitudinal wrapping punching outer conductor, but for closed places such as mines, peak cutting slotting or longitudinal wrapping punching are used. The application frequency of such slotting forms is not wide, the weight of the cable is large, the bending performance cannot meet the requirements of the mine, and the cost is very high

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