Production method for stranding pre-twisted conductor into cable and conductor pre-twisting device

Abstract

The invention discloses a production method for stranding a pre-twisted conductor into a cable, which comprises the following steps: firstly, pre-twisting and standing a plurality of conductor cores into a sector or tile-shaped conductor core according to a cable forming pitch; then extruding an insulating layer outside the sector or tile-shaped conductor core; carrying out cable forming and stranding on the sector or tile-shaped core extruded with the insulating layer to form a cable core; and finally, extruding an outer sheath outside the cable core. A conductor pre-twisting device used in the method comprises a frame stranding body and a pre-twisting frame. A plurality of conductor wire coils are arranged on the frame stranding body; the axis of each conductor wire coil is vertical to that of the frame stranding body; a compressing die is arranged on the pre-twisting frame; the frame stranding body and the pre-twisting frame respectively rotate by taking the respective axes as the centers; the rotating speed of the frame stranding body is greater than that of the pre-twisting frame; and conductor wires led out from a plurality of conductor wire coils protrude together after being compressed by the compressing die. Due to the adoption of the technical scheme, the phenomenon of cracking on the insulating layer of the cable, which is caused by stress, is completely eliminated,so that the process quality in cable production is further ensured and the reliable quality guarantee is provided for the subsequent process production.

Description

technical field [0001] The invention relates to a production method and a conductor pre-twisting device for stranding a pre-twisted conductor into a cable. Background technique [0002] The existing large-section fan-shaped or tile-shaped conductors are stranded using a conventional stranded method, which is generally suitable for four-plus-one or three-plus-two five-core cables and four-core or three-plus-one four-core cables. cable. When the company conducts insulated cores of special-shaped conductors into cables, most of them use disk-type cable-forming machines, cage-type cable-forming machines, etc. To ensure the roundness of the cables, fan-shaped or tile-shaped wires must be ensured during the cable-forming process. The sharp corner apex of the core is always aligned with the center of the cable, and the non-back-twisting cable is mostly used. That is to say, the cable must rotate at the center of the cable while moving forward at the line speed to ensure the round...

AI Technical Summary

Problems solved by technology

[0003] The main defect is that the XLPE insulated large cross-section cable is prone to serious distortion due to the stress of XLPE insulation at the end of cable formation to the last ten meters, and sometimes large-scale low-voltage XLPE cable insulation layer Serious quality problems caused by cracking of the insulation layer due to torsion

If the cable is seriously twisted or the insulation is cracked at the user site, the impact will be more serious

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