Research On Mixing Process Simulation And Visualization Of Internal Mixer

Rubber mixing is a key part of the rubber processing process.The quality of the rubber compound not only affects the subsequent processing procedures,but also affects the performance and service life of rubber products.In the mixing process,there are distributed mixing and dispersion mixing.The effects of these two types of mixing determine the quality,production efficiency,and unit energy consumption of the compounded rubber.Therefore,it was of great significance to carry out in-depth research on the rubber mixing process and mechanism,whether it was for the study of perfecting rubber mixing theory or the application of rubber processing equipment.The study of the mixing process of the internal mixer was mainly to study the flow mechanism and changes of the rubber material inside the internal mixing chamber.However,the working internal mixing chamber was a closed and opaque structure,and it was difficult to mix the rubber in the internal mixing chamber during the mixing process.Visually observe the flow situation of the oil.Therefore,numerical simulation and visualization technology have an important role in the analysis of the mixing process and mechanism.The application of this technology can intuitively analyze the rubber compound inside the mixing chamber subjected to rotor shear-squeeze-The flow state formed by stretching can better analyze the influence of the rotor structure on the mixing process,which provides theoretical support for the optimal design of the rotor and the optimization of the mixing process.In this paper,the method of joint analysis of finite element and discrete element is used to dynamically simulate the mixing process of the internal mixer,and the flow mechanism and changes of the rubber compound during the mixing process are observed and observed through the self-developed visual internal mixer experimental platform.The analysis was also verified through relevant experiments,which provedthat the numerical simulation technology and visualization research can effectively reflect the flow of rubber during the mixing process.The main work completed in this article is as follows:1.Dynamically simulate the flow characteristics of the mixing process of the internal mixer.Using the same physical model,using two finite element and discrete element numerical simulation analysis methods,the dynamic research of numerical simulation was carried out,combined with the characteristics of the mixing process to achieve a more realistic dynamic simulation characterization of the rubber mixing process,and established the corresponding Transient calculation model;starting from each moment of rotor rotation,the continuous flow of materials in the mixing chamber is studied from the aspects of pressure field,velocity field and shear viscosity field;and then the dispersion state of the discrete model at each moment Observe to understand the speed distribution and distribution of the mixing rubber at various moments,and finally achieve the purpose of computer numerical simulation to dynamically characterize the mixing process.2.Developed a visual mixer experiment platform.Using 3D printing technology to achieve rapid prototyping of the rotor model,a set of rotor libraries that can be applied on the visualization platform has been established;adding colloids with color particles to the visual mixer experiment platform can dynamically show that the rubber is mixing.The axial and circumferential flow conditions in the mixing chamber;intuitively reflects the shear and mixing state of the rubber compound in the mixing chamber;the accuracy of the numerical simulation is further verified by experimental research on the visualization platform.3.Developed the parameter design software for the mixer rotor and the R & D platform for the main components,which can realize the parametric design,numerical simulation and optimization of the tangential rotor,and the 3D printing of the rotor.Verification,followed by the development of the mixer rotor of the mixer experiment machine and the enlargement of the rotor of the pilot machine,and finally the industrial application of the optimized mixer rotor.4.Experimentally studied the mixing effect of asynchronous / synchronous quadrangular rotors and quadrilateral synchronous rotors with different initial phase angles,compared the rubber flow in the mixing process,and studied the mixing ofrubber under different rotor configurations The performance difference of the products indirectly characterizes the mixing situation inside the mixing chamber.At the same time,the results observed by the visual experiment platform are compared with the results of computer numerical simulation and mixing experiments.The results are consistent and show that the flow field and mixing situation of the synchronous rotor compound are better than the asynchronous rotor,and the phase angle of the synchronous rotor is 0.The phase angle reflects the strong feeding ability and the best dispersion uniformity of the mixed carbon black.