An extruder screw with internal and external spirals

Abstract

The invention discloses an extruder screw rod with inner and outer threads and relates to an extrusion machine. The extruder screw rod with inner and outer threads is characterized by comprising a cylinder (1), a screw rod (2) with inner and outer threads and a central shaft (3), wherein the screw rod (2) and the cylinder (1) are matched with the central shaft (3); the screw rod (2) is hollow and both the inner and outer threads are formed in the screw rod (2); the helical directions of the inner and outer threads are the same; the screw rod (2) and the cylinder (1) form external and internal flow channels together with the central shaft (3); the inner and outer threads of the screw rod (2) are different in shape, but same in section distance. Multiple simulation experiments prove that the extrusion capacity per unit time of a single-screw extruder can be greatly increased and the capacity ratio is increased; the extruder screw rod is reasonable in design and can be popularized and applied on a large scale; the production efficiency is improved and the cost performance of extruder equipment is greatly improved.

Description

technical field [0001] The invention relates to an extrusion machine, in particular to an extruder screw with internal and external spirals. Background technique [0002] The most important core technology in the extruder is the thread shape of the screw. Ordinary single-screw extruders are simple in structure, easy to operate and maintain, and have good pressure building and conveying capabilities, but the mixing effect is not as good as that of twin-screw extruders and triple-screw extruders. Extrusion machine, twin-screw extruder and triple-screw extruder have large volume and high manufacturing cost, and the triple-screw extruder will produce a central area where the back pressure is low, the material conveying speed is slow, and the material residence time is too long , Burning will occur and affect the taste. Contents of the invention [0003] The object of the present invention is to provide an extruder screw with internal and external helixes, the screw is hollow,...

AI Technical Summary

Problems solved by technology

[0002] The most important core technology in the extruder is the thread shape of the screw. Ordinary single-screw extruders are simple in structure, easy to operate and maintain, and have good pressure building and conveying capabilities, but the mixing effect is not as good as that of twin-screw extruders and triple-screw extruders. Extrusion machine, twin-screw extruder and triple-screw extruder have large volume and high manufacturing cost, and the triple-screw extruder will produce a central area where the back pressure is low, the material conveying speed is slow, and the material residence time is too long , will burn and affect the taste

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