Single-head spiral double screw

Abstract

The invention relates to the field of extruders, in particular to a single-head spiral double screw which comprises a screw barrel mechanism, a screw rod mechanism, a linkage mechanism, an extrusion mechanism and a clearing mechanism. When materials enter the positions of a first connecting screw rod and a second connecting screw rod, a driving screw rod and a driven screw rod drive the first connecting screw rod and the second connecting screw rod to rotate, and the materials are subjected to finer injection molding. In the rotating process of the driving screw rod, whenever a convex block isrotated to the position of an abutting block, the abutting block extrudes a spring to drive an extrusion connecting rod and an extrusion block to move towards the top, when the convex block rotates away from the position of the abutting block, an extrusion connecting rod drives the extrusion block to continuously extrude the plastic in a thread groove, therefore, the injection molding PET plasticcan be continuously extruded in the injection molding process, the injection molding precision is further enhanced, and the injection molding effect is improved.

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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