Study On Dynamic Characteristics Of Continuous Mixer

With the rapid development of economy, china has become the largest producer of cement concrete and the production number of mixer are leading the world. However, compared with developed countries, Chinese industrial base is weak, not only on concrete mixing but also on manufacturing of mixing equipment. The reality directly results to have big gap with the developed countries. The ready-mixed concrete is an important sign of construction of modernization, the proportion of ready-mixed concrete in the total production of concrete largely reflects the industrial level of concrete. The ready-mixed concrete are produced by the forced continuous mixer, which is a kind of new-type mode of production, concrete. But due to the line speed of conventional double horizontal shaft mixer presents linear distribution from the inner wall of the mixer to the mixing shaft, when the location is closer to mixing shaft, the line speed there would be the lower. When the mixing speed is too low, it will not only easily bring the phenomenon like enclasping shaft in the mixing shaft, but also reduce the mixing quality and mixing efficiency.In order to solve the above problems, beginning from the concept of concrete mixing and application of the new mixing technology, the concrete stirring process was describing by determined equation, stochastic equation and smooth curves, so we further understand the relationship among variables during stirring concrete. The paper brings forward the vibratory mixing technology, tests have proved that the mixer designed using this new technology can improve the mixing efficiency of concrete. This paper also brings forward a new method that increase mixing efficiency, it can detect the internal situation when mixer stirring concrete.The paper borrowed design technique from other mixers and combined the related results that task group have been researched about small continuous mixer, we not only design and manufacture the ordinary continuous mixer, but also optimise parameters of mixer.On the completion of the main parts design, 3d-design software and simulation software are applied to the virtual assembly and simulation analysis of the stirring device. In this article, according to the two kinds of loads, the structure design and strength calculation are done for the mixing arm of stirring device. We use the ansys to make the strength simulation analysis and modal analysis on the stirring device at the same time. The strength simulation analyses the stress condition of the real simulation of mixing device in the actual work process, then the dangerous section area is found. The modal analysis obtains the first 30 order natural frequency of mixing device, and provides a reference for the selection of the exciter excitation frequency.Finally, according to crushing and attrition of material on mixer blade, the mechanical model of material on blade is established. According to nonlinear vibration and the basic theory of rotor dynamics, Mechanical model of vibration system and differential equations of motion are established. This paper has adopted the arithmetic of fourth-order Runge-Kutta, analyzing wave forms graph, chart of axis track, phase plane plot of system movement. Analysis results show that mixer system appears chaotic motion under some certain design parameters. This state of motion on mixers can better destroy cement coagulation group, increasing the number of effective collision of concrete particle, which can effectively improve the microscopic homogeneity of concrete and improve efficiency of concrete mixing.