Low friction and high strength flexible cable

Abstract

The invention discloses a low friction and high strength flexible cable. Eight copper conductor units are twisted in a two-to-two manner, forming a first, a second, a third and a fourth symmetrical insulated wire pair, the external surfaces of which are respectively winded by a first polytetrafluoroethylene band. The first, the second, the third and the fourth symmetrical insulated wire pair are twisted to the outer surface of an aramid fiber reinforcing piece, forming a cable core. A second polytetrafluoroethylene layer winds around the external surface of the cable core longitudinally. The gap between the second polytetrafluoroethylene layer and the first, the second, the third and the fourth symmetrical insulated wire pair is filled with a plurality of cotton yarns. A fourth polytetrafluoroethylene band winds around the external surface of a metal shielding layer longitudinally. An oversheath layer coats the external surface of a third polytetrafluoroethylene layer. The diameter ofthe aramid fiber reinforcing piece is 200D. The invention is advantageous in that at the time of bending, the metal wire has adequate moving position without generating stretching to cause broken wires; sliding between adjacent metal wires is easier without generating static interference.

Description

technical field [0001] The invention relates to a data cable, in particular to a low-friction, high-strength flexible cable. 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 co...

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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