Vacuum Rake Dryer Stirring Shaft Dynamic Response And Numerical Simulation

Vacuum rake dryer can produce high strength gypsum by using low temperature steam heat source of coal power enterprises to dry industrial solid waste desulfurization gypsum.The high-strength gypsum produced with desulfurization gypsum instead of the corresponding cement can not only achieve carbon emission reduction,but also resource utilization of gypsum by-products in industrial solid waste,solving the pollution of solid waste to the ecological environment.With its high adaptability to dry materials,simple operation and high drying efficiency,the vacuum rake dryer has become a more used drying equipment.However,with the development of industry,the requirements for mixing equipment are higher,so the design and optimization of the mixing shaft is increasingly important.The mixing equipment developed at home and abroad have been constantly broken,so the optimization of the performance and design of the mixing shaft is the trend of future development.The design optimization of the stirring shaft is difficult,and the previous design mainly relies on experience.In this paper,the dynamic response analysis and numerical simulation of the stirring shaft of vacuum rake dryer are1.Based on the bending theory of Timoshenko beam,the mathematical model of the vibration of the stirring shaft is established.Because the viscosity of the material will increase the resistance of the stirring blade to the shaft,the differential product method is used to solve the control equation of the stirring shaft deflection,and the conclusion that the radial force of the shaft will increase the stirring shaft deflection.2.Using the differential product method to solve the vibration response model of the vacuum rake dryer stirring shaft,the analysis of the stirring shaft deflection under periodic excitation,obtained in the shaft radius is small,the stirring shaft mid-point deflection value is larger,with the larger shaft radius,the stirring shaft mid-point deflection decreases and then smoothly fluctuates,the maximum value of the stirring shaft mid-point deflection appears in the location of the shaft length is larger conclusion.3.Considering the temperature field condition,the axial temperature field of the stirring shaft is regarded as a one-dimensional steady-state thermal conductivity problem.The stirring shaft thermoelastic vibration model is established,and the stirring shaft deflection is analyzed by solving the fourth-order thermoelastic vibration equation,and it is concluded that the increase of temperature will increase the stirring shaft deflection in the temperature range of 300°C to 700°C.4.A finite element mechanical model of the simplified stirring shaft is established,and the static structural analysis of the stirring shaft is carried out with the help of ANSYS finite element software,and the fatigue life analysis of the stirring shaft under stirring conditions is carried out by combining the S-N curve of the material.