| Impact crusher is widely used in the crushing of metal and non-metallic minerals due to its strong adaptability to minerals,large crushing ratio,high production capacity and wide product particle size distribution.Its crushing performance is an important measure of the level of crushing technology.Therefore,it is of great significance to analyze and study the crushing performance of the impact crusher to improve the design and application of crushing equipment.Based on the PF1825 impact crusher,a three-dimensional solid model of the impact crusher and a model of the ore particles to be crushed are established through Solid Works and EDEM software.The reliability of the ore model is verified by comparing the maximum crushing force obtained by discrete element simulation analysis with the maximum crushing force calculated by theory.Based on the ore model,the crushing efficiency is measured by the number of broken bonds between small particle spheres,the energy consumption can be measured by the number of broken bonds by a unit of energy,the ratio of the number of collisions to the number of all collisions to measure the speed of wear.According to the crushing efficiency,energy consumption and wear speed,comprehensive evaluation of the crushing performance of the impact crusher.The control variable method is used to analyze the influence factors on the crushing performance such as inclination angle of guide plate,angle of unloading point,inclination angle of striking surface,width of striking surface,shape of striking position,inclination angle of first-stage impact plate,inclination angle of impact tooth surface,distance of impact tooth surface.The angle of the guide plate,the inclination of the striking surface,the inclination of the first-stage impact plate and the inclination of the impact tooth surface were determined to have significant effects on the crushing performance.The response surface method is used to analyze the combined effects of the angle of the guide plate,the inclination of the striking surface,the inclination of the first-stage impact plate,and the inclination of the impact tooth surface.The functions of these four structural parameters and the number of broken bonds,the number of broken bonds per unit energy,and the proportion of collision between ore are obtained.After normalizing the three indicators,a function that reflects the level of crushing performance and four structural parameters is constructed.The optimized structural parameter combination was solved through the optimization algorithm: the inclination of the guide plate is 65°,the inclination of the striking surface is 9.83°,the inclination of the first-stage impact plate is 20°,and the inclination of the impact tooth surface is 0°.Comparing the simulation process of single particle ore crushing by the impact crusher before optimization and the process after optimization,the crushing performance after optimization has been greatly improved.The research results of this paper have a high reference value for the structure optimization of the impact crusher and the improvement of the crushing performance. |
