Dynamic Analysis And Calculation Of Shaft-Block Eccentric 3080 Large Vibrating Flip-Flow Screen

Coal has been playing a dominant role in China’s energy consumption structure,which is closely related to the development of China’s national economy.In the face of the sudden epidemic in 2020,China’s energy problems were highlighted.The state plans to promote the epidemic prevention and control and energy reform,putting the energy industry back on the right track.During this period,China’s coal production and manufacturing industry has made great contributions.Vibrating screen is the key equipment of coal preparation,which uses the principle of vibration to complete the separation and cleaning of raw coal.With the construction of modern coal base,in order to improve the market reaction ability and ensure the quality of finished products,the vibrating screen machine is also developing towards the direction of large processing capacity,high efficiency and large-scale.In this paper,the 3080 large-scale vibrating relaxor screen with shaft block eccentricity is taken as the research object.Firstly,the screening principle and the structure of the whole machine and its components are introduced.According to the working characteristics of the flip-flow screen,the key parameters of the screen are selected and calculated.Based on the dynamic principle,the dynamic equation of the vibrating flip-flow screen is established and the numerical solution is carried out,and the third-order natural frequency and vibration coefficient are obtained The amplitude frequency characteristic curve verifies the rationality of the selected parameters;the dynamic equation is numerically simulated by Matlab/Simulink,and the vibration waveform of the frame and the amplitude of stable operation are obtained,which meet the working requirements.Using Workbench software to analyze the static and harmonic response of the simplified vibrating flip-flow screen,get the distribution of stress and deformation of the screen,verify that the structure of the screen body meets the strength requirements;through modal analysis,get the vibration mode and natural frequency of the flip-flow screen,avoiding harmful vibration mode in the design and preventing resonance damage.Based on the approximate differential equation of deflection curve,the expressions of deflection angle and deflection equation of the middle eccentric section of eccentric shaft are solved by superposition method,and the ratio of exciting force between eccentric block and eccentric shaft is determined;the eccentric shaft,eccentric block and other parts are designed and selected.In order to facilitate the design of eccentric shaft,the deflection calculation software of exciting shaft is designed by using Lab VIEW software.Through the finite element simulation of the designed eccentric shaft in Workbench,the distribution of stress and deformation under its working condition is obtained,which proves that its strength meets the requirements.The simulation deflection curve of the eccentric shaft is drawn and compared with the theoretical curve to verify the correctness of the theoretical formula,Based on the harmonic response analysis,the lightweight design is carried out.ADAMS is used to simulate the multi-body dynamics of the flip-flow screen,and the velocity,acceleration,displacement curves at the mass center of the fixed screen frame and the floating screen frame,as well as the space-time trajectory of the screen frame motion are measured to verify the correctness of the theoretical calculation.A test bench was built to simulate the motion of the screen surface and measure the response of the screen surface.The flexible body of eccentric shaft is established,and the load spectrum file of eccentric shaft is obtained by ADAMS rigid-flexible coupling simulation;the static analysis results of eccentric shaft are obtained by workbench,and the S-N curve of eccentric shaft material is modified.Combined with the above data,the appropriate fatigue solver is selected to evaluate the fatigue life of eccentric shaft components,and the results show that the fatigue life meets the use requirements.This paper has 102 pictures,19 tables and 118 references.