Three-layer co-extrusion machine head for low-smoke halogen-free cable

Abstract

The invention provides a low-smoke halogen-free cable three-layer co-extrusion machine head which comprises a machine frame and a machine shell, a conical through hole is formed in the machine shell, a middle-layer feeding port and an inner-layer feeding port are formed in the side wall of the machine shell, an outer die head is connected to the end, penetrating out of a conductor, of the machine shell, an outer-layer die and a forming cavity are inserted into the outer die head, an outer-layer feeding port is formed in the outer circle side of the outer die head, and an inner-layer feeding port is formed in the outer circle side of the outer die head. A middle-layer mold and an inner-layer mold are sequentially inserted in the machine shell, an outer-layer mold is arranged, an outer-layer runner, a middle-layer runner and an inner-layer runner are arranged on the outer sides of the middle-layer mold and the inner-layer mold respectively, and an annular outer-layer discharging port, a middle-layer discharging port and an inner-layer discharging port which are communicated with the forming cavity are formed in the ends, close to the forming cavity, of the outer-layer mold and the inner-layer mold respectively. The outer-layer feed port is communicated with the outer-layer discharge port through an outer-layer runner, the middle-layer feed port is communicated with the middle-layer discharge port through a middle-layer runner, and the inner-layer feed port and the outer-layer feed port are communicated with the inner-layer discharge port through an inner-layer runner. The three-layer co-extrusion machine head for the low-smoke halogen-free cable, provided by the invention, has the function of solving the problem that the production speed of the existing low-smoke halogen-free cable is too slow.

Description

technical field [0001] The invention relates to the technical field of power cable processing, in particular to a three-layer co-extrusion head for low-smoke and halogen-free cables. Background technique [0002] Low-smoke halogen-free cable refers to the halogen material of the insulating layer material of the cable. In the case of burning, no halogen-containing gas is released, and the smoke concentration is low. It is suitable for places with a rated voltage of 450 / 750V and below, where there are requirements for halogen-free, low-smoke, flame-retardant, and high safety and environmental protection requirements. Such as high-rise buildings, stations, subways, airports, hospitals, large libraries, gymnasiums, villas, family homes, hotels, hospitals, office buildings, schools, shopping malls and other crowded places. [0003] The production speed of existing low-smoke halogen-free cables ranges from 80m / min to 200m / min, and the low production and processing speed has becom...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a three-layer co-extrusion head for low-smoke and halogen-free cables,

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