Magnesium oxide mineral-insulated cable production method

A technology of mineral insulated cables and production methods, which is applied in the direction of cable/conductor manufacturing, conductor/cable insulation, circuits, etc., which can solve the problems of large power consumption, high technical requirements, and large floor space, so as to save electric energy and shorten process, the effect of reducing the number of annealing

Active Publication Date: 2017-02-22
上海胜华电气股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 elec...

Method used

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  • Magnesium oxide mineral-insulated cable production method
  • Magnesium oxide mineral-insulated cable production method
  • Magnesium oxide mineral-insulated cable production method

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] figure 1 It is a schematic diagram of the production process of the magnesium oxide mineral insulated cable of the present invention.

[0024] See figure 1 , The production method of magnesium oxide mineral insulated cables provided by the present invention includes granulation-pressing-sintering-assembly-coating-welding-drawing-on-line annealing-cold rolling-finished product inspection-warehousing.

[0025] 1. Granulation:

[0026]

[0027] Small mesh value and large particles form the skeleton of the molded body; large mesh value and small particles fill the gaps in the green body and increase the density.

[0028] 2) Glue ratio: water: polyvinyl alcohol = 100:2

[0029] The water is heated to 80-90°C, polyvinyl alcohol is incorporated, and kept at about 100°C for 2 hours, and then cooled naturally.

[0030] Polyvinyl alcohol is non-tox...

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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...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B13/06
CPCH01B13/00H01B13/06
Inventor 王建中戴伟国朱吕欧
Owner 上海胜华电气股份有限公司
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