Inner wall cooling device used during extrusion production of plastic pipe

Abstract

The invention discloses an inner wall cooling device used during extrusion production of a plastic pipe. The device is composed of an air circulation cooling system, a ventilation pipe, a thermal insulating layer and a gas spraying head. The ventilation pipe is arranged inside an extruding machine. The gas spraying head communicates with the front end of the extruding machine and is mounted on a die core rod. The air circulation cooling system communicates with the rear end of the extruding machine and is arranged outside the extruding machine. The portions, making contact with the extruding machine, of the ventilation pipe and the gas spraying head are spaced from the extruding machine through the thermal insulating layer. The gas spraying head sprays gas reversely. The inner wall coolingdevice has the advantages that the outer wall of the extruded plastic pipe is cooled by a cooling device of a traditional extrusion production line, it can be guaranteed that the plastic pipe is quickly molded by additionally arranging an effective cooling device on the inner wall, the inner wall cooling device is particularly suitable for production of thick-walled pipes, the melting sag phenomenon of melted plastic is effectively avoided, and efficient production of products such as nuclear grade polyethylene pipelines and thick-walled high-pressure-resistance plastic pipelines is achieved.

Description

technical field [0001] The invention relates to a mechanical device, in particular to an inner wall cooling device in the extrusion production process of plastic pipes. Background technique [0002] Plastic pipes are widely used due to their non-polluting, recyclable, good hydraulic performance, and long service life. In recent years, with the rapid development of the nuclear power industry, plastic pipes used in the field of nuclear power have also emerged as the times require. However, The requirements for nuclear-grade pipes are very high, especially in terms of pressure resistance, which requires extremely thick walls made of plastic pipes. Plastic pipes generally use advanced plastic pipe extrusion production lines to extrude molten resin through molds of various specifications, and obtain finished pipes through vacuum sizing and cooling. Molten plastics have a certain sag effect, especially for pipes with extremely thick walls. Under the sag effect, it is extremely di...

AI Technical Summary

Problems solved by technology

Molten plastics have a certain sag effect, especially for pipes with extremely thick walls. Under the sag effect, it is extremely difficult to achieve uniform wall thickness pipe preparation, and even the pipes cannot be formed. Therefore, new processes or new materials are urgently needed. , or a new device to change this situation, plastic pipe products are widely used in the field of nuclear power

Images