Irradiation cross-linking polyethylene insulated low-voltage power cable preparing method

Abstract

The invention discloses an irradiation cross-linking polyethylene insulated low-voltage power cable preparing method and belongs to the technical field of cable manufacturing. A cable comprises a conductor, an insulation wire core which is formed in an insulation mode and is extruded on the outer edge of the conductor, a cable core formed by the insulation wire core, filling materials at a gap of the cable core, a cable forming wrapping belt layer wrapped outside the cable core, an inner protecting layer extruded outside the cable forming wrapping belt, a wrapped metal armoring layer and an extruded outer protecting sleeve from inside to outside. The cable is prepared through the following steps of material selecting, wire drawing, annealing, conductor intertwisting, insulation layer extruding and irradiation, cable forming intertwisting and cable forming wrapping belt wrapping, inner protecting layer extruding, metal armoring layer wrapping and outer protecting sleeve layer extruding in sequence. According to the novel irradiation cross-linking polyethylene insulated low-voltage power cable preparing method, energy loss can be lowered, and production cost can be lowered.

Description

technical field [0001] The invention belongs to the technical field of cable manufacture. Background technique [0002] The production process of traditional XLPE insulated low-voltage power cables generally includes the following steps: drawing and stranding of conductors, extruding XLPE insulation, crosslinking the insulated cores by boiling or steam heating, and using filling The material and tape are cabled, the inner sheath is extruded, the metal armor is wrapped, and the outer sheath is finally extruded. [0003] The current low-voltage cross-linked cables are divided into two types: warm water cross-linking and radiation cross-linking. The silane crosslinking process has a long production cycle (two-step crosslinking requires several hours of water boiling, and natural crosslinking silane cables need several days to crosslink), occupies a large production site, and the melt viscosity of silane crosslinking materials is high. Poor fluidity, a small amount of pre-cros...

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Problems solved by technology

The silane crosslinking process has a long production cycle (two-step crosslinking requires several hours of water boiling, and natural crosslinking silane cables need several days to crosslink), occupies a large production site, and the melt viscosity of silane crosslinking materials is high. Poor fluidity, a small amount of pre-crosslinking is easy to occur during production, the screw and machine head need to be cleaned after shutdown, labor intensity and material waste are large, and the conductor is easily oxidized after boiling; the electron beam irradiation crosslinking process requires one-time production equipment Large investment, complex operation and maintenance, high safety protection requirements, uneven irradiation of cables with large cross-sections, low operating rate of equipment, low utilization rate, and increased costs

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