Research On The Transfer Mechanism Of Impact Energy And Rotor Optimization Design Of Vertical Shaft Impact Crushe

Vertical shaft impact crusher is an essential and important equipment in the production of manufactured sand,which has the characteristics of simple structure,light weight,high crushing efficiency,and superior product particle shape.However,in the actual production process,the vertical impact crusher generally has problems with high energy consumption during crushing and severe wear of the rotor,which increases the production cost for manufactured sand enterprises,does not meet the social and economic development needs of energy conservation and emission reduction,and seriously affects the production efficiency and service life of the crusher.Although extensive research has been conducted by scholars both domestically and abroad on the crushing mechanism of vertical shaft impact crushers,there has been relatively little research on the energy transfer mechanism within the crushing chamber and the energy dissipation during the crushing process.Additionally,the impact of the structural parameters and operating conditions of the crusher rotor on the energy dissipation mechanism remains unclear.Therefore,this paper utilizes a coupled simulation analysis method of Computational Fluid Dynamics and Discrete Element Method(CFD-DEM)to study the transfer mechanism of impact energy and the wear of easily worn parts of the rotor under the accumulation of impact energy.Based on the analysis of the material particle motion characteristics,the structural parameters of the rotor are optimized.This provides a theoretical reference for the development of efficient and energy-saving vertical shaft impact crushers and the improvement of wear on easily worn parts.Firstly,the PL8500 vertical shaft impact crusher rotor produced by a company in Guizhou was taken as a reference.Based on the working principle of the rotor and a detailed kinematic analysis of the particle motion in the crushing chamber,the rotor was redesigned.The main structural parameters of the rotor were preliminarily determined.According to the redesigned rotor structural parameters,CFD-DEM coupled simulation model of the vertical impact crusher was established.By experimentally measuring the material’s restitution coefficient,rolling friction coefficient,and static friction coefficient,the motion characteristics of the material in the crushing chamber were deeply analyzed,revealing the influence law of the operating parameters and rotor structural parameters on the material’s motion characteristics.Based on the analysis of the movement characteristics of material particles in the crushing chamber,the impact energy dissipation during material collision was calculated and analyzed through CFD-DEM coupled simulation of the crushing chamber.The power consumption of the crusher,impact energy distribution,impact energy dissipation rate,collision frequency,and collision energy spectrum of different collision types were studied in depth under different operating parameters.The study revealed the influence of working parameters on the energy transfer process in the crushing chamber.Finally,based on the analysis of material impact energy dissipation,an Archard wear model was established for the vulnerable component of the rotor-the guide plates,and the wear distribution of the guide plates under accumulated impact energy was analyzed.A multi-objective optimization method was proposed,which combined orthogonal experiments,multiple regression analysis,and genetic algorithms,to optimize the rotor structural parameters that affect guide plate wear,ensuring the crushing performance of the crusher while reducing guide plate wear.