Eccentricity-adjustment-free die device for multi-core cable insulation extrusion and extrusion manufacturing technology

Abstract

The invention provides an eccentricity-adjustment-free die device for multi-core cable insulation extrusion and extrusion manufacturing technology. The device comprises a multihole die core, a die sleeve seat sleeves the multihole die core, and a gap is formed between an inner wall face of the die sleeve seat and an outer wall face of the multihole die core; the front end of the multihole die core is conical, and the rear end of the die core is provided with a die core chamber which radially narrows towards the front end face; one end of the die core chamber extends outwardly, a plurality of die core nozzles are disposed in an extension part; and an end of the die sleeve seat is provided with a circular hole, a die sleeve plate matching the circular hole is installed at the position of the circular hole, the die sleeve plate is provided with a plurality of die sleeve metering holes, the die sleeve metering holes correspond to the die core nozzles, and concentricity is guaranteed by utilizing positioning pins. The eccentricity-adjustment-free die device has the advantages of compact and reasonable structure and convenient operation; one end of the multihole die core is provided with the multiple die core nozzles, the die sleeve seat matching the die core nozzles and the die sleeve plate are installed, and the die sleeve plate is provided with the die sleeve metering holes matching the die core nozzles, so a multi-core cable can be processed at the same time without eccentric adjustments.

Description

technical field [0001] The invention relates to the technical field of cable manufacturing, in particular to an adjustment-free eccentric die device and an extrusion manufacturing process for multi-core cable insulation extrusion. Background technique [0002] With the rapid development of my country's economy, the domestic demand for wire and cable is growing rapidly. At present, the wire and cable industry is the second largest industry in China after the automobile industry. The total output value of China's wire and cable has surpassed that of the United States, becoming the world's largest producer of wire and cable. Usually, the insulation layer of plastic insulated wire and cable is generally produced by extrusion process. The national standards or industry standards of relevant wire and cable have made clear regulations on the insulation thickness of cables, such as GB / T 12706.1-2008 "Rated Voltage 1kV (Um = 1.2kV) to 35kV (Um = 40.5kV) extruded insulated power cabl...

AI Technical Summary

Problems solved by technology

Therefore, for cable insulation extrusion, it is necessary to strictly control the insulation thickness of the cable, and it is necessary to adjust the eccentricity of the insulation to prevent the cable insulation thickness from not meeting the standard and causing potential quality hazards in the cable; at the same time, it is also necessary to control the insulation thickness of the cable. Prevents significant increase in material costs for cables

When extruding single-core cable insulation, the mold sleeve of the cable extrusion mold can usually be adjusted in four directions, up, down, left, and right, so that the cable mold sleeve and the mold core can maintain the same concentricity, and an insulating layer with good eccentricity can be produced; But for multi-core cables, when the insulating layer is extruded on multiple conductors at the same time, it is impossible to maintain the same concentricity between the mold sleeve hole and the mold core hole of the cable mold through the adjustment of the mold sleeve, so it is difficult to produce multiple cables. Cable products with good insulation eccentricity can only meet the requirements of the standard for the average thickness of the cable insulation and the thickness of the thinnest point by thickening the insulation thickness of the cable.

[0003] The cable insulation thickness uniformity produced by common process methods is poor, and the average thickness will seriously exceed the standard, resulting in serious waste of materials and high cost

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