Study On The Profiles Design And Experiment For One Novel Twin-Screw Kneader

The twin-screw kneader is a extrusion equipment widely used in the rubber, engineering plastics, medicine and other fields. The twin-screw rotors are the core components of the twin-screw kneader, and the line of the rotor face design has a direct impact on the transmission, and shear properties of twin-screw kneader. Studying the kneaders’core working parts that the twin-screw rotors and the production of material properties on the rotors of the kneader is an important way to improve the the kneaders’working performance, and has great significance to the development of the new twin-screw kneader.Taking the core component twin-screw rotor of the twin-screw kneading machine as the research object. The core component of rotors on the end of the screw rotor profiles of the twin screw kneader is studied applying the functional thinking; twin screw rotors’static mechanical properties is analyzed; based on finite element theory, the kneaders’flow field, twin-screw rotors’structure is analyzed; the impact of the fluid pressure and barrel external heating system and other technical parameters on the screw rotors are studied. These studies will provide basis for the development of the screw rotor kneaders. Here are the main works:1) An overview of the research on development of twin-screw kneader, and the classification of the twin-screw kneader summary are summed up. The development of screw rotor profiles of the twin screw kneader is studied. A brief introduction on the structures of the twin-screw kneader is introduced;2) Taking the design of screw rotor profiles of twin-screw kneader with the conjugate principle method as the foundation, a new method applying generalized functionals thinking to study the design of the screw rotor profiles’is proposed. The thinking of studying the design method of screw rotor profiles will be broaden, and provided the basis for study the best screw rotor best profiles, then the rotor geometric characteristics are studied;3) The finite element model of internal flow field of kneader, the twin-screw rotors’ structure model and multi-field coupling model are established. Fluid dynamics is researched applying numerical simulation. The impact of twin-screw rotors’center distance and speed on the fluid dynamics characteristics is studied. The impact of flow field pressure, external torque and barrel temperature on the rotors structure is also studied. The researches are important to select the appropriate screw rotors clearance and provide basis for the optimization design of the twin-screw rotors.4) The force and torque of twin-screw rotor components are in equilibrium when the twin screw kneader is in stable work states, and these forces have important impact on the power consumption of twin-screw kneader, while its larger axial force plays a decisive role in bearing selected of the kneaders. The static characteristics of the rotors is analyzed, and the changes of force and moment of the rotors is studied when the kneader is working. This provides basis for the selection of the kneader bearings and this has important significance to reduce power consumption.5) Through the design of experimental devices to establish the novel twin-screw kneader system, and to select the low-density polyethylene resin as experimental materials. Arrange the experimental program reasonable combining with orthogonal experimental design method to verify the feasibility of this novel twin-screw rotor profiles design, to detect the rheological properties of the extrusive production and to study the impact of rotors speed and barrel temperature on the extrusive production. The research provides the foundation for improving the performance of the twin-screw kneaders.