Auxiliary sizing device for plastic pipe production

Abstract

The invention discloses an auxiliary sizing device for plastic pipe production. The auxiliary sizing device comprises a frame, wherein the frame is provided with a rotatable left roller and a rotatable right roller by virtue of a left rotating shaft and a right rotating shaft. The left roller and the right roller are in a shape which is gradually thinned down from two ends to the middle. The frame is provided with an upper linear guide rail and a lower linear guide rail, a left moving part and a right moving part are respectively fixed on sliding blocks of the upper linear guide rail and the lower linear guide rail, the left rotating shaft and the right rotating shaft are arranged on the left moving part and the right moving part, and the frame is provided with a propelling device which can push the left moving part and the right moving part to advance / retreat on the upper linear guide rail and the lower linear guide rail. The auxiliary sizing device disclosed by the invention ensures that a plastic pipe can be produced at a high speed, and roundness of the plastic pipe can also be guaranteed; and the auxiliary sizing device has the advantages of simple structure and low manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of plastic pipe production, in particular to a device for auxiliary shaping and deformation correction of incompletely cured plastic pipes. Background technique [0002] The general process of plastic pipe production is: heating extrusion-mold preliminary setting-vacuum sizing-cooling-drawing-cutting, etc., among which "heating extrusion" controls the quality and production speed of plastic extruded per unit time; "mold preliminary setting ", "vacuum sizing" is used to control the diameter, ovality and surface quality of plastic pipes. [0003] The "heated extruded" plastic is transported forward in a semi-molten state, enters the vacuum sizing box, and enters the "mold preliminary shaping" and "vacuum sizing" processes. The plastic pipe coming out of the vacuum sizing box is still in a relatively hot state. State, not fully solidified, need to be cooled by cooling water tank, and once the plastic pipe is o...

AI Technical Summary

Problems solved by technology

[0003] The "heated extruded" plastic is transported forward in a semi-molten state, enters the vacuum sizing box, and enters the "mold preliminary shaping" and "vacuum sizing" processes. The plastic pipe coming out of the vacuum sizing box is still in a relatively hot state. State, not fully solidified, need to be cooled by cooling water tank, and once the plastic pipe is out of the vacuum sizing box, it will lose the shackles of the mold and form a natural gravity state, which will produce certain deformation, especially the larger the diameter and the wall thickness. The thinner the plastic tube, the greater the deformation, and if the deformation is too large, the produced plastic tube will be unqualified and scrapped

In order to ensure that the plastic pipes that are not fully cured are not deformed, the production speed should not be too fast, because once it is too fast, the temperature of the plastic pipes coming out of the vacuum sizing box will be relatively high and easy to deform. The efficiency is low, and the plastic pipes produced per unit time are less. To increase the production speed, the existing method is to increase the cooling power of the vacuum calibrating box, but the cost of doing so is very high

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