Dynamic Performance Simulation And Fatigue Life Prediction Of Eccentric Roll Crusher

Crushing machinery plays a very important role in mining,metallurgy,chemical industry and other fields.With the continuous improvement of modern industrial demand,under the premise of realizing crushing function,began to constantly pursue the excellence of crushing power,crushing productivity and other performance indicators.As a new type of crushing machine,eccentric roll crusher has excellent crushing performance,but also has the possibility of one crushing to complete coarse crushing.However,there are few research results directly related to eccentric roll crusher,and the design theory is not perfect,so it is necessary to explore the dynamic characteristics of eccentric roll crusher and to predict the fatigue life of key components,which can not only fill the gaps in related fields,but also provide guidance for the optimization of eccentric roll crusher structure.This paper takes eccentric roll crusher,a new type of crushing machine,as the research object,aiming at exploring the dynamic characteristics of eccentric roll crusher and predicting the fatigue life of key components.The main research contents of this paper are as follows:This paper introduces the structure and working principle of eccentric roll crusher,emphasizes on the influence of flywheel mechanism on the load uniformity of intermittent work and its general design method,realizes the structure design of eccentric roll crusher and builds the virtual prototype model.According to the calculation of the action load of the rotary part of eccentric roll crusher,the absolute speed calculation formula of roll body and the dynamic equation of eccentric roll crusher are derived.The basic dynamic equation of three-phase induction motor is derived,and the virtual model of the motor is built based on MATLAB/Simulink module.Simulink module of virtual prototype of eccentric roller crusher was established in Recur Dyn,and data transmission between Recur Dyn and Simulink was established.The mechanical and electrical coupling simulation of eccentric roll crusher was completed,and the mechanical and electrical characteristics of roll starting under the mechanical and electrical coupling state and relatively stable working condition were simulated and analyzed,and the dynamic load characteristics of the rotary part were obtained.Finally,the prototype test was carried out on the prototype test platform to verify the correctness of the theory and simulation analysis.In order to analyze the flexible body of roll spindle under load condition,the discrete material is generated in EDEM environment,and the flexible body mesh of eccentric roll crusher and roll spindle are established in Recur Dyn environment.The DEM-MFBD coupling simulation analysis is realized.The stress distribution nebulae of the flexible spindle under load working condition is obtained by simulation,and the stress curve of the maximum stress point of the dangerous section of the roller spindle is analyzed,which provides a reference for the optimization of the roller spindle.The fatigue damage theory and the method for fatigue analysis of components are introduced.By using the calculation results of DEM-MFBD coupling analysis and the Durability module in Recur Dyn,the fatigue life analysis for the roller main shaft is achieved,the cloud diagram for the life of the roller main shaft is obtained,and the fatigue working life of the roller main shaft under working condition is analyzed.In this paper,the research on dynamic characteristics simulation of a new type of crushing machinery-eccentric roll crusher mainly involves the dynamic load of rotating components and rigid-flexible coupling analysis,and the fatigue life prediction of the main components.The research content of this paper provides a reference for the followup research on similar problems.