Thick-wall pipe production system

Abstract

The invention relates to a thick-wall pipe production system which comprises a mold device. The mold device comprises an outer mold and an inner mold, a blank moving runner is formed between the inner wall of the outer mold and the outer wall of the inner mold, a cooling flow dividing ring is arranged in the blank moving runner, an outer flow dividing runner is formed between the outer wall of the cooling flow dividing ring and the inner wall of the outer mold, an inner flow dividing runner is formed between the inner wall of the cooling flow dividing ring and the outer wall of the inner mold, and a cavity used for containing a cooling medium is formed in the cooling flow dividing ring. According to the production system, double cooling of the inner surface and the outer surface of a pipe is achieved, and therefore the cooling speed is increased; meanwhile, an air cooling device plays a good role in controlling the wall thickness of the pipe, so that the deviation of the wall thickness of the pipe is greatly reduced, and the production speed is increased by 50% or above; and the requirement on the anti-sag performance of the pipe raw material is further greatly reduced.

Description

technical field [0001] The invention relates to the technical field of pipe fitting production, in particular to a thick-wall pipe production system. Background technique [0002] At present, in the actual production of PE molds, the shaping cooling device for plastic pipes with smooth inner and outer walls is a production method for cooling and sizing the pipes through the outer sizing sleeve set in the vacuum calibrating box. Using this production method, the working principle of pipe forming cooling is to first cool the outer surface of the pipe to shape, then gradually inwardly cool and shape, and finally cool the inner wall of the pipe until the entire pipe wall is completely cooled and shaped. When this method is used to produce large-diameter thick-walled plastic pipes, due to the poor thermal conductivity of plastics, the cooling time required for shaping is long, and the cooling and shaping of plastic pipes is often insufficient, which will lead to sagging, that is,...

AI Technical Summary

Problems solved by technology

When this method is used to produce large-diameter thick-walled plastic pipes, due to the poor thermal conductivity of plastics, the cooling time required for shaping is long, and the cooling and shaping of plastic pipes is often insufficient, which will lead to sagging, that is, due to plastic pipes The plastic that is still in molten state before it is fully set, continues to flow to the lowest point of the pipe under the action of gravity, thus forming plastic pipes with different wall thicknesses

The uneven wall thickness of the pipe seriously affects the overall performance of the pipe

At the same time, due to the low cooling and shaping efficiency of this cooling method, it also restricts the improvement of the production speed of plastic pipes.

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