A screw support device and a twin-screw extruder with the same

Abstract

The invention provides a screw support device and a double-screw extruder provided with the screw support device. The screw support device comprises one pair or more pairs of screw support elements, wherein two screw support elements used in pairs are mounted at the same axial positions of two screw spindles; each screw support element comprises an inner ring, an outer ring and a rolling body; two outer rings are limited by each other; the axial length of each outer ring is smaller than that of each inner ring; the clearance between the radial direction of the outer ring and the inner wall of a machine barrel is smaller than the clearance between a screw flight and the inner wall of the machine barrel; the radial clearance between two outer rings is smaller than the radial clearance between two screws; structures capable of keeping certain distance between the rolling bodies and preventing the rolling bodies from moving in the axial direction relative to the inner rings or the outer rings are arranged on the screw support elements. The double-screw extruder provided with the screw support device supports one or more different positions of the screws so as to eliminate the abrasion between the screws and the machine barrel and the abrasion between the screws.

Description

technical field [0001] The invention relates to a screw support device, in particular to a screw support device for a twin-screw extruder, and a twin-screw extruder with the device. Background technique [0002] Twin-screw extruders are widely used in polymer processing such as molding, blending, modification, and reactive extrusion due to the variability and adaptability brought by its building block structure and excellent mixing performance. The twin-screw extruder mainly includes a transmission system, a feeding system, an extrusion system, a heating and cooling system, and a control system. The extrusion system is the core part of the twin-screw extruder, mainly including a screw and a barrel. The material is fed into the barrel by the feeding system, and the rotation of the screw in the barrel produces screw conveying and mixing effects on the material, so that the material undergoes extrusion processes such as solid conveying, melting, exhaust, mixing and melt conveyi...

AI Technical Summary

Problems solved by technology

If the wear occurs in the melting section, it will lead to a decrease in the melting ability, and cause uneven temperature and pressure fluctuations; if the wear occurs in the melt delivery section, it will reduce the melt delivery ability; between the flight of the screw and the inner wall of the barrel The increase of the gap will also reduce the heat transfer efficiency between the barrel and the material

At the same time, the environment of the two screws is not exactly the same, and the flexible deformation of the two screws will also be inconsistent, causing the screw elements on the two screws to contact each other, causing wear, cutting, and resulting in uneven material flow

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