Extrusion device

Abstract

The invention discloses an extrusion device. The extrusion device comprises a material barrel and a screw rod sleeved by the barrel; a material inlet and a material outlet are arranged on wall of the material barrel; a first screw groove is arranged on inner side wall of the material barrel to form a first screw ridge and a second screw groove is arranged on outer side wall of the screw rod to form a second screw ridge, wherein the first screw groove and the second crew groove are opposite in spiral directions; the extrusion device also comprises a one-step screw rod section; the material inlet is located on the side wall of the material barrel and at a position corresponding to a front end or the front of the one-step screw rod section; the material outlet is located on the side wall of the material barrel and at a position corresponding to a rear end or the back of the one-step screw rod section; the first screw ridge and the second screw ridge corresponding to the one-step screw rod section are in cross matching along screw ridge directions to form an annular pulse peak and valley structure, wherein the screw ridges in raised parts of the first and second screw ridges are screw ridge peaks while the screw ridges in sunk parts are screw ridge valleys; the screw ridge peak of the first screw ridge can be matched with the screw ridge valley of the second screw ridge and the screw ridge peak of the second screw ridge can be matched with the screw ridge valley of the first screw ridge. The extrusion device has the advantages such as short material residence time, strong processing capability and good dispersive mixing and distributive mixing effects.

Description

technical field [0001] The invention relates to the field of screw mixing and extrusion, in particular to an extrusion device. Background technique [0002] At present, the equipment with screw is widely used in industrial occasions such as petroleum, chemical industry, household appliances, food processing, polymer filling modification and reaction extrusion. Existing belt screw devices mainly include single-screw extruders, twin-screw extruders and multi-screw extruders. Among them, the twin-screw extruder can be further divided into co-rotating, counter-rotating, meshing, non-meshing forms, staggered, parallel and other forms. Although the emergence of twin-screw and multi-screw extruders can improve the mixing and mixing effect to a certain extent, generally speaking, the existing equipment has five major defects: (1) the mixing and mixing effect is poor; (2) the melting process is long and Uneven; (3) high energy consumption and low energy utilization; (4) low specifi...

AI Technical Summary

Problems solved by technology

Although the emergence of twin-screw and multi-screw extruders can improve the mixing and mixing effect to a certain extent, generally speaking, the existing equipment has five major defects: (1) the mixing and mixing effect is poor; (2) the melting process is long and Uneven; (3) high energy consumption and low energy utilization rate; (4) low specific output; (5) narrow adaptability to processed materials, and time-consuming and laborious replacement of structural components

[0009] South Korean researchers Kim and Kwon proposed a technical scheme of inserting intermittent short flight in a single screw along the development direction of the screw groove to introduce periodic hyperbolic point disturbance, and proposed the concept of chaotic screw. Under the large situation, the mixing effect of polymer melt has been improved; But there is still certain technical defect in this chaotic flip-flop of short flight: (1) Disturbance is discontinuous: be provided with the screw screw disturbance of discontinuous short flight is discontinuous It is only at the discontinuity of the short screw edge as the trigger of chaos that the mixing will be greatly improved, but this will inevitably lead to increased power consumption and lack of continuous dynamics thinking; (2) Difficult to process: as a trigger of chaos The short flight of the device is fixed with the screw, which is similar to the structure of a double-ended screw, which increases the difficulty and cost of screw processing; (3) the improvement of mixing is local, and the dispersion and mixing effect is poor: the short as a trigger of chaos There is no relative movement between the screw edge and the screw channel, which has little effect on the improvement of dispersion mixing, resulting in the mixing effect at the bottom of the screw channel even worse than that of the traditional single-screw extruder, so the improvement of the mixing process is passive, partial and limited

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