Research On Crushing Mechanism And DEM Simulation Method Of Gyratory Crusher

In all aspects of economic construction and construction industry,the gyratory crusher has been favored by people.In the whole crushing process,the gyratory crusher is mainly used in the initial primary crushing,which plays a decisive role in the efficiency of the subsequent process.Because the working environment of the gyratory crusher is bad,the lining plate is worn seriously,and the production efficiency is reduced due to the shutdown and replacement of the lining plate.Material is subject to complex impact in the process of crushing,it is difficult to use the instrument to collect the force data of the material in real time,and it is also impossible to directly detect the wear of the lining plate in the process of crusher.Therefore,it is urgent to study the wear mechanism of the lining plate of crusher.The calculation model of crushing cavity curve was established to study the movement of material and moving cone.The principle of lamination crushing is applied to the gyratory crusher.Based on the layered crushing characteristics and kinematics analysis of materials,a mathematical model of the productivity of the gyratory crusher was proposed to study the effects of the rotating cone speed,eccentricity and the bottom Angle of the moving cone on the productivity.According to the general equilibrium theory,the crushing process of materials is studied,and the particle size distribution of products is calculated by combining the crushing function matrix and the selection function matrix model.Based on the analysis of the crusher’s kinematic characteristics,layered characteristics and the geometric structure of the cavity type,the calculation model of crushing force was established,and the change rule of crushing force with the change of the depth of the crushing cavity was studied.Combined with Evertsson’s research on wear,the calculation model of liner wear is established.The bonding parameters were calibrated by uniaxial compression simulation experiment.The friction coefficient and recovery coefficient between particles were calibrated by three-level and three-factor method.Particle replacement technology was used to complete the simulation of material crushing process,and the wear amount of lining plate was extracted.The effectiveness of the wear amount calculation model was verified by comparing the calculation model with the wear amount obtained from simulation.Based on the principle of fixed mass and the concept of working state Angle,a method to optimize the cavity shape of the worn crusher was proposed,which took the productivity and product size of the crusher as the objective function.The optimized cavity was simulated in EDEM software,and the simulation results were extracted.The wear resistance and product quality of the optimized cavity were significantly improved,which verified the feasibility of the cavity optimization method after wear.It has a certain theoretical significance for the actual production and future research.