Mineral insulated cable pair twist production technology in same metal sleeve

Abstract

A mineral insulated cable pair twist production technology in a same metal sleeve belongs to the power cable technology field. A key technology in the invention is a wring pulling process. A torsion apparatus and a disc pulling machine are connected in series so as to carry out linkage production. The torsion apparatus makes the cable be twisted and deformed gradually along a center line so that two parallel wires in the cable are gradually twisted. And then the disc pulling machine is used to carry out hole shrinkage and remove twisted marks of a cable metal sleeve. Finally, annealing is performed, wring pulling is performed again, through several times of wring pulling, a predetermined twist pitch is reached, and the two leads can not touch each other and are wrapped by magnesium oxide in an insulation mode. The technology is advanced and simple and operation is convenient. The cable possesses performance that a work temperature is high; a shielding property is excellent; a radiation resistance capability is high; anti-disturbance performance is good; bending performance is good too; mechanical strength is high; the structure is compact; an external diameter is small; a service life is long; flexibility is good and so on. On-site construction installation technology is simple.

Description

technical field [0001] The invention relates to a production process of pair twisting of mineral insulated cables in the same metal sheath, and belongs to the technical field of power cables. Background technique [0002] Mineral insulated cables are composed of high-conductivity copper conductors, inorganic mineral insulation (usually magnesium oxide powder), and copper sheaths. Because the components of the cable do not contain organic materials, its excellent fire resistance has been recognized by the industry, and it has been widely used in fire-fighting power transmission systems and high-temperature places. [0003] However, there are new problems in solving the detection and control system transmission of electronic monitoring systems in fire-fighting or high-temperature places. The mineral insulated cable structure for transmission is two wires in the same metal sheath. Using the traditional mineral insulated cable production process, two wires Can only be placed pa...

AI Technical Summary

Problems solved by technology

[0003] However, new problems have arisen when solving the detection and control system transmission of electronic monitoring systems in fire-fighting or high-temperature places. The structure of the mineral insulated cable for transmission is two wires in the same metal sheath. Using the traditional mineral insulated cable production process, two wires Can only be placed parallel in the metal sleeve

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