Screw support device and twin-screw extruder with same

Abstract

The invention provides a screw support device and a twin-screw extruder with the same. The screw support device comprises a screw support element or a plurality of screw support elements. The screw support element / screw support elements is / are installed on a screw mandrel. Each screw support element comprises an inner ring and an outer ring, wherein the inner ring is installed on the screw mandrel and rotates along with the screw mandrel; a machine cylinder is provided with a structure limiting the rotation of the outer ring; the axial length of the outer ring is smaller than the axial length of the inner ring; the space between the outer ring, in the radial direction, and the inner wall of the machine cylinder is smaller than the space between a screw flight of a screw and the inner wall of the machine cylinder; the inner ring and the outer ring rotate relatively. Each screw support element is provided with fluid passages. The arrangement form / forms of the screw support elements on the two screws is / are a staggered arrangement or / and a symmetry arrangement. According to the twin-screw extruder with the screw support device, a position or a plurality of different positions of each screw is / are supported, so that the abrasion between the screws and the machine cylinders is eliminated.

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

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