Shielded data cable suitable for repeated bending

Abstract

The invention discloses a shielded data cable suitable for repeated bending, which comprises eight copper conductor units and an aramid fiber reinforcement, the copper conductor unit comprises an aramid fiber at the center, an inner conductive layer and an outer conductor layer; four symmetrical insulated wires The pair is twisted on the outer surface of the aramid fiber reinforcement to form a cable core; a second polytetrafluoroethylene layer longitudinally wraps the outer surface of the cable core, and the gap between the second polytetrafluoroethylene layer and the four symmetrical insulated wire pairs Filled with several cotton yarns; a cotton fiber thread is wound on the outer surface of the second polytetrafluoroethylene layer to form a buffer sliding layer, and the winding direction of the cotton fiber thread is opposite to the twisting direction of the four symmetrical insulated wire pairs. Wrapped side by side on the outer surface of the buffer sliding layer to form a metal shielding layer; several metal wires are wound side by side on the outer surface of the buffer sliding layer to form a metal shielding layer, and the outer surface of the metal wires in the metal shielding layer is wrapped with the first PTFE tape. The data cable of the invention has small friction coefficient, is soft and stretch-resistant, has no frictional static electricity, and can still ensure stable structure and electrical performance after frequent movement.

Description

technical field [0001] The invention relates to a data cable, in particular to a shielded data cable suitable for repeated bending. Background technique [0002] The structure of the traditional shielded data cable is composed of 4 sets of symmetrical signal wire pairs, wrapped with a layer of polyester tape, and then wrapped with a layer of aluminum-plastic composite tape for shielding, and the outer layer is extruded with PVC or other plastic coatings. . Symmetrical signal pairs are formed by the assembly of two copper conductors with an insulated wire covered by a layer of high-density polyethylene. Product performance conforms to the specification requirements of TIA / EIA568B.2. In order to solve the problem of electrical performance attenuation and electromagnetic interference at lower frequencies, some products are designed to braid a layer of copper wire shielding on the outer layer of the aluminum-plastic composite tape. For shielded data cables that require moveme...

AI Technical Summary

Problems solved by technology

However, in environments with frequent movements such as robotic arms and relatively harsh environmental conditions, the performance reliability of this type of product cannot meet the requirements. After hundreds of movements, there will be problems such as conductor breakage, increased attenuation, and decreased anti-interference performance.

In the process of moving, there is friction between the insulation, the insulation and the outer tape, and the shield. On the one hand, it is easy to generate static electricity and cause signal interference. At the same time, frequent friction will also cause the mechanical and physical properties of the insulating material to decline.

A general mechanical arm will require more than 100,000 movements. If the influence of the sliding of the cable core structure cannot be solved, the problems of product fatigue resistance and shielding stability cannot be solved, and the signal transmission requirements of the mechanical arm cannot be guaranteed.

At this point, it is difficult for the traditional cable structure to meet the requirements

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