Study On The Crushing Characteristics Of Large Gyratory Crusher Based On The Discrete Element Method

This paper completed the simulation of the large gyratory crusher based on theDiscrete Element Method (DEM). Through the comparison of many different conditionsamong the different size of the Closed Side Setting (CSS) and the different strength ofrocks, the research obtained many results of the average production capacity, the productsize and the power of the main shaft.The main contents of this paper are as followed.1. Established the models of the spider, mantle and concave, assembled three modelwhich CSS is175mm,215mm and250mm. Established the hopper of the mine car, thematerial diversion slope to ensure the material flow.2. Established the model of the feed size distribution, created the brakeage model ofthe rock within250~1200mm; Simplified the model under250mm with using theunbroken rock model. Divided the compressive strength of material into three group, thelow, the medium and the high, which strength is100MPa,200MPa and300MPa. Thebreakage model is calibrated by the Bonded Particle Model (BPM), and the BPMparameters could be standardized by the uniaxial compression tests.3. According to the differences of the CSS and material strength, nine groups ofsimulation working condition was carried on. Through the analysis of simulation results,and the average productive capacity, transient productivity, material crushing degree andthe crushing power of mantle etc, draw a conclusion that the crushing properties of largegyratory crusher: the average production capacity, material crushing degree are allimproved, output stability and the crushing power of mantle is reduced. when the CSSincreases. However the average production capacity, output stability and materialcrushing degree are all reduced, the crushing power of mantle is increased. when materialstrength is increased4. Verified the reliability of the method in simulating the breakage behavior of therock in crusher based on DEM in this paper, by comparing the simulation data and theactual data of a gyratory crusher which is used widely. Through the simulating of a new cavity design and the reference cavity, evaluated the new design features and providedreferences.