Extrusion insulation low-voltage power cable and preparation method thereof

Through real-time monitoring and multi-level judgment mechanism, the problem of uneven thickness of the insulation layer is solved, the uniformity control of the insulation layer is achieved, the service life of the cable is extended, and the production efficiency and cable performance are improved.

CN120656801AActive Publication Date: 2025-09-16JIANGSU HONGNENG CABLE CO LTD
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Patent Information

Application Number
CN202511030421.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-25
Publication Date
2025-09-16
Estimated Expiration
2045-07-25

AI Technical Summary

Technical Problem

In the prior art, the uneven thickness of the insulation layer of extruded insulated low-voltage power cables causes distortion of the electric field distribution, accelerates insulation aging, and affects the long-term electrical performance of the cables.

Method used

The diameter of the insulated wire core is monitored in real time by a laser diameter gauge, cross-sectional grayscale images under non-periodic fluctuations are collected, the eccentricity and void ratio are calculated, a multi-level judgment mechanism is established, and the extrusion process is adjusted according to the comprehensive quality index of the extrusion package and the insulation performance evaluation value, including adjusting the melt temperature and extrusion speed of the insulating material.

Benefits of technology

It achieves uniformity control of insulation layer thickness, delays aging of insulation layer, increases service life and reliability of cables, reduces scrap rate, and improves production efficiency and comprehensive cable performance.

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Abstract

The invention relates to the technical field of cable preparation, in particular to an extruded insulation low-voltage power cable and a preparation method thereof.The preparation method comprises the steps that metal wires are twisted into a conductor according to preset twisting parameters, and the conductor is preprocessed; extruding an insulating layer on the surface of the pretreated conductor by using a screw extruder to obtain an insulated wire core; monitoring the diameter of the insulated wire core in real time by using a laser diameter measuring instrument, and determining the fluctuation characteristic type of the diameter of the wire core under a first preset condition; obtaining the eccentricity of the insulating layer and the void ratio between the insulating layer and the conductor; judging the qualification of the extrusion process according to the extrusion comprehensive quality index; under the condition that the extrusion process is unqualified, the qualification of the extrusion process is secondarily judged according to the insulation performance evaluation value; under the condition that the extrusion process is judged to be unqualified for the second time, an adjustment strategy of the extrusion process is determined; and after the insulated wire cores qualified in the extrusion process are twisted into a cable, an outer protective sleeve is extruded. The production efficiency and the product stability of the cable are improved.
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