Involute rotor of internal mixer

Abstract

The invention discloses an involute rotor of an internal mixer. The involute rotor comprises a rotor substrate (1), wherein a long spiral rib (2) and a short spiral rib (3) are formed on the surface of the rotor substrate one time. An outer contour line of a cross section in any position of the rotor composed of the rotor substrate, the long spiral rib and the short spiral rib is composed of a circular arc of a rotor base circle (9), an involute rotor rib working surface (5), a straight line or a concave curve rotor rib non-working surface (7) and a circular arc transition line (6). The involute rotor is suitable for mixing, stirring and crushing of various materials in not only rubber and plastics industries but also a light industry, a chemical industry and the industries such as building materials and cyclic utilization, and particularly is significant in technical advantage when being used for high filling reinforcing materials, especially high filling silicon dioxide materials.

Description

Technical field [0001] The invention relates to an internal mixer rotor, in particular to an internal mixer involute rotor for high polymer processing, belonging to the technical field of high polymer processing machinery. Background technique [0002] The mixing of materials refers to the process in which various compounding agents and fillers are uniformly dispersed in the polymer, which is an important link in the processing of the polymer. After the materials are added to the mixing chamber, the materials are strongly squeezed, sheared and stirred in the mixing space formed by the mixing chamber and the rotor to complete the mixing and uniform dispersion of various compounding agents and fillers in the polymer. [0003] Generally speaking, the material mixing process is divided into two stages: mixing and dispersion. The mixing is mainly related to the shear deformation; the dispersion is mainly related to the magnitude of the shear stress. Good and uniform dispersion is more...

AI Technical Summary

Problems solved by technology

[0004] At present, the technical defects of the curvature shape of the elliptical rotor ribs of internal mixers are mainly reflected in: the pressure direction of most of the arc segments on the working surface of the rotor ribs in the "meniscus sickle" area acts on the material relative to the normal line of the mixing chamber The angle is always greater than the friction angle between the material and the mixing chamber, so that the material is driven to slide along the mixing chamber, and the sliding friction consumes energy and heat in vain, which is not beneficial to mixing and dispersion, resulting in little mixing effect in the "meniscus sickle"; In the "meniscus sickle" area, the wedging angle formed by the arc curve of the rotor convex rib working surface at the entrance of the "high shear" area at the top of the rib is too large, and the material cannot be smoothly and stably wedged into the "high shear" area. Therefore, the largest and most effective shearing stress cannot be obtained; the "flat top" shape of the rotor rib top makes a sudden change in the corrugation angle at the intersection of the arc of the rib working surface and the top of the rib, which is not only not conducive to eating materials, but also affects The continuity of the flow of the rubber material is prone to cracking or sliding, and the material will heat up too quickly due to the rapid increase of the instantaneous local shear stress and shear rate; the "flat top" on the top of the rotor rib and the mixing chamber form The "high shear" area of ​​the slit flow channel with equal front and rear clearances is three times lower than the shear stress generated by the trumpet-shaped gap; the capacity of the "high shear" area of ​​the slit flow channel provided by the elliptical rotor is too low, which affects Mixing efficiency and quality of mixed material

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