Shielded flexible cables for robots

Abstract

The invention discloses a shielded flexible cable for a robot. The cable comprises eight copper conductor units and an aramid reinforcer, wherein the copper conductor units comprise aramid fibers located in the centers, internal conductive layers and external conductive layers; four symmetric insulated wire pairs are twisted on the external surface of the aramid reinforcer to form a cable core; a second polytetrafluoroethylene layer longitudinally wraps the external surface of the cable core; a plurality of cotton yarns are filled in gaps between the second polytetrafluoroethylene layer and the four symmetric insulated wire pairs; a cotton fiber wire is wound on the external surface of the second polytetrafluoroethylene layer to form a buffer sliding layer; a winding direction of the cotton fiber wire is opposite to twisting directions of the four symmetric insulated wire pairs; a plurality of metal wires are wound on the external surface of the buffer sliding layer side by side to form a metal shielding layer; winding of the metal wires in the metal shielding layer is opposite to that of the cotton fiber wire; and a third polytetrafluoroethylene layer wraps the external surface of the metal shielding layer. The flexible cable is small in friction coefficient, soft and anti-tensile, does not generate friction static, 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 flexible cable for a robot. 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 movement, the conduc...

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