Shielded data cables for manipulators

Abstract

The invention discloses a shielding type data cable for a mechanical arm. The shielding type data cable for the mechanical arm comprises eight copper conductor units. The eight copper conductor units are twisted pairwise to form four symmetric insulation wire pairs, the outer surfaces of the four symmetric insulation wire pairs are wrapped by first polytetrafluoroethylene bands, and the four symmetric insulation wire pairs are twisted to form a cable core. The outer surface of the cable core is longitudinally wrapped by a second polytetrafluoroethylene layer, and clearances between the second polytetrafluoroethylene layer and the four symmetric insulation wire pairs are filled with a plurality of cotton yarn. A cotton fiber wire is wound on the outer surface of the second polytetrafluoroethylene layer to form a buffer sliding layer, the winding direction of the cotton fiber wire is opposite to the twisting direction of the four symmetric insulation wire pairs, a plurality of metal wires are wound on the outer surface of the buffer sliding layer in parallel to form a metal shielding layer, and the winding direction of the metal wires in the metal shielding layer is opposite to that of the cotton fiber wire. The outer surface of the metal shielding layer is wrapped by a third polytetrafluoroethylene layer. The data cable is small in friction coefficient, flexible, resistant to stretching and free of friction static electricity, and the structure and electrical performance can be kept stable after frequent movement.

Description

technical field [0001] The invention relates to a data cable, in particular to a shielded data cable for a mechanical arm. 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 / EIA568. 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 movement, the cond...

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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