Magnesium oxide mineral-insulated cable production method

Abstract

The invention discloses a magnesium oxide mineral-insulated cable production method, which comprises the following steps: S1) carrying out magnesium oxide powder granulation to obtain magnesium oxide particles; S2) inputting the magnesium oxide particles into a forming machine and carrying out pressing to form a half-cylindrical embryo body; S3) carrying out sintering on the half-cylindrical embryo body to form magnesium oxide porcelain bodies; S4) selecting two magnesium oxide porcelain bodies to cover a copper rod conductor, and longitudinally wrapping copper strips outside the merged cylindrical magnesium oxide porcelain body to form a cable embryo body; and S5) carrying out drawing, on-line annealing and cold rolling on the cable embryo body to form a magnesium oxide mineral-insulated cable. The provided magnesium oxide mineral-insulated cable production method not only can improve cable reducing continuous rolling technology, reduces annealing frequency, improves cable production process length and reduces process, but also improves work efficient greatly, saves power and reduces production energy consumption.

Description

technical field [0001] The invention relates to a cable production method, in particular to a magnesium oxide mineral insulated cable production method, which can be continuously produced to make the cable infinitely long. Background technique [0002] MI cable is called magnesium oxide mineral insulated cable in China. At present, there are two kinds of MI cable production processes in the world, the insulating layer magnesium oxide powder filling method and the insulating layer magnesium oxide porcelain column method. The former is to put a considerable height of copper sheath Stand upright, keep the conductor copper rod in the center and ensure that they do not touch each other, fill the magnesium oxide powder and tamp it. Features: Equivalent operating height, large space occupation; difficult to operate; difficult to control dust; difficult to control quality. The latter is a short type of magnesium oxide porcelain column, which is assembled segment by segment. Featur...

AI Technical Summary

Problems solved by technology

Features: complex process, large footprint, high technical requirements

The common characteristics of the two: ① Repeated annealing for many times, the power consumption is large, and the electricity cost accounts for 5% of the sales volume and 30% of the production cost

②The length is limited, and many intermediate joints are required during laying, which is prone to operational failures

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