A single-head helical twin-screw

Abstract

The invention relates to the field of extruders, specifically a single-head helical twin-screw, including a screw barrel mechanism, a screw mechanism, a linkage mechanism, an extrusion mechanism and a cleaning mechanism; when materials enter the first connecting screw and the When the position of the second connecting screw is described, the driving screw and the driven screw drive the first connecting screw and the second connecting screw to rotate, and further finer injection molding is performed on the material; when the driving screw rotates During the process, whenever the bump rotates to the position of the conflicting block, the conflicting block immediately presses the spring, driving the extruding link and the extruding block to move towards the top, when the The protrusion is turned away from the part of the conflicting block, and the extruding connecting rod drives the extruding block to continuously extrude the plastic inside the thread groove, so that the injected PET can be continuously extruded during the injection molding process. The plastic is extruded to further enhance the precision of injection molding and improve the injection molding effect.

Description

technical field [0001] The invention relates to the field of extruders, in particular to a single-head helical twin-screw. Background technique [0002] Extruder, one of the types of plastic machinery, originated in the 18th century. According to the flow direction of the head and the angle between the centerline of the screw, the extruder can divide the head into a right-angle head and an oblique head. The screw extruder relies on the pressure and shear force generated by the rotation of the screw, so that the material can be fully plasticized and evenly mixed, and then formed through the die. Plastic extruders can be basically classified into twin-screw extruders, single-screw extruders, and rare multi-screw extruders and non-screw extruders. Among them, single-screw extruders and twin-screw extruders are the most widely used. Extruder, in the twin-screw extruder, the most important structure is its twin-screw structure, especially the single-head helical twin-screw. ...

AI Technical Summary

Problems solved by technology

[0003] However, when the traditional single-head helical twin-screw is used for injection molding and extrusion of special PET plastics, because PET plastics have excellent heat resistance and have the greatest toughness among thermoplastics, the process of injection molding and extrusion of them In the process, there will be a situation where the molten plastic has a high viscosity to the twin-screw, especially when the preheating device of the extruder is damaged and the preheating effect is not good, which is not conducive to the injection molding process, thus affecting the injection molding effect; at the same time, in the long run During the working process, a lot of dust and impurities will inevitably accumulate on the outer wall of the extruder, which will eventually affect the service life of the device

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