Different-direction differential rotary extrusion device, extruder and material manufacturing method

Abstract

The invention relates to a different-direction differential rotary extrusion device which comprises a machine barrel and a screw mechanism arranged in the machine barrel. The screw mechanism comprisesa first screw and a second screw, the top diameter and the root diameter of the first screw are always meshed with the root diameter and the top diameter of the second screw correspondingly, the first screw and the second screw perform different-direction differential rotation at a fixed rotation speed ratio, at least one first middle arc structure is arranged between the root diameter and the top diameter of the first screw, and a second middle arc structure tangent to the first middle arc structure all the time is arranged between the root diameter and the top diameter of the second screw;and the first middle arc structure is coincident with the top diameter and the root diameter of the first screw in trend, and the second middle arc structure is coincident with the root diameter and the top diameter of the second screw in trend. Through different-direction differential rotation, self-cleaning in the machining process is achieved between the two screws; and an original closed C-shaped chamber is expanded into an 8-shaped chamber through the first middle arc structure and the second middle arc structure, and the pressure building capacity and the extrusion characteristic of thescrew structures can be controlled.

Description

technical field [0001] The invention belongs to the field of multi-screw extruders, and in particular relates to a different-direction differential-speed rotary extrusion device, an extruder and a material production method. Background technique [0002] Co-rotating and counter-rotating multi-screw extruders mainly include a barrel and multiple screws installed in the inner cavity of the barrel. Among them, intermeshing counter-rotating twin-screw extruders are the most widely used counter-rotating multi-screw extruders. The traditional counter-rotating twin-screw extruder adopts the working mode of two screws rotating in opposite directions at the same speed. The material is enclosed in several independent C-shaped chambers and pushed towards the exit direction. It has good pressure building ability, so it is widely used. in the extrusion molding process. [0003] At present, in order to change the mixing and melting efficiency in the meshing zone, a differential twin-scre...

AI Technical Summary

Problems solved by technology

refer to figure 1 , the differential speed counter-rotating twin-screw strengthens the dispersion and mixing effect by introducing a larger speed difference in the meshing area, but the fact that the material is still enclosed in several independent C-shaped chambers has not changed, and the difference between different screws and between the upstream and downstream of the screw There is still no mixing relationship, which results in a limited effect on mixing enhancement

Under such a screw configuration, through the meshing displacement relationship, the C-shaped chamber is pushed from the feed port to the discharge port in the axial direction, and the material is enclosed in the same C-shaped chamber to complete the process of melting, mixing and exhausting. The upstream and downstream lack an adaptive mechanism for the melting process. When the output increases, it is easy to cause unmelted solid materials to block the screw channel, resulting in a significant surge in energy consumption

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