Study On Optimization Of Performance Parameters Of Crankshaft Connecting Rod Flip-flow Screen

As an important raw coal classification equipment in power coal production process,the screening efficiency of crank connecting rod flip-flow screen will directly affect the quality of power coal products.In view of the influence of the performance parameters of the flip-flow screen on the screening efficiency and screen surface life in the process of power coal production,based on the theory of elasticity and multi-body dynamics of the relaxation screen,the elastic strut model of the flexible screen surface and the discrete catenary model of the screen surface are established,and the influence laws of the three performance parameters of the flip-flow screen on the screening efficiency are studied,In order to seek the highest screening efficiency and reduce the wear of screen surface,the performance parameters of flip-flow screen were optimized.The main research contents of this paper include:(1)The structure and working principle of the flip-flow screen are analyzed,and the dynamic model of the crank connecting rod flip-flow screen is established.According to the structure parameters of the screen surface,the simulation model of the screen surface is built.The influence of the three performance parameters of the flip-flow screen(screen surface inclination,relaxation and relaxation frequency)on the screening efficiency is briefly analyzed,and the evaluation index of the screening effect is determined.The feeding properties of the flip-flow screen are analyzed,which lays a foundation for the later study on the influence of performance parameters on screening efficiency.(2)Based on the theory of elasticity and multi-body dynamics,the flexible screen surface model and discrete screen surface model are established,and the simulation screen surface models are established respectively according to the two theories.By comparing the kinematic parameters of the two models,the feasibility of the discrete screen surface model is verified,which provides a basis for the follow-up simulation experiment of performance parameters on screening efficiency.(3)The MBD-DEM simulation model of the screen surface is established,and the screening process of the relaxation screen is jointly simulated by the multi-body dynamics simulation software Recur Dyn and the discrete element software edem.The influence of single performance parameter on screening efficiency is simulated by control variable method,and the influence law of single performance parameter on screening efficiency is obtained.The simulation experiment is designed through the orthogonal experimental design software Design Expert 13.The functional expressions of screening efficiency and screen surface inclination,relaxation and relaxation frequency are obtained by using the response surface method.The rationality of the model is verified,and the performance parameters with the highest screening efficiency are obtained.(4)By comparing the sensitivity of the performance parameters to the screening efficiency,the relaxation is selected as the adjustment object,and the simulation experiment is designed and the functional relationship between the relaxation and the maximum wear depth of the screen surface is obtained.Through the linear weighting and optimization method,the comprehensive optimal parameter value is obtained.Finally,the screening efficiency and screen wear of the comprehensive optimal parameter value and the highest efficiency performance parameter value are compared through simulation experiments.The results showed that after optimization,the screening efficiency decreased slightly and the wear of screen surface improved significantly.This paper has 56 figures,21 tables and 71 references.