Study On Compressive Comminution Model Of Particle Beds And Crushing Process Of The Cone Crusher Based On The Discrete Element Method

Compressive comminution of particle beds is that in the crushing chamber rock or mineral materials performance multi-layered distribution, which is crushed by extrusion force namely a large number of particles gathered together, the external forces acting on particle beds makes contact with each other, interaction between particles that causes compressive comminution of particle beds. With crushing grinding depth theoretical study and the improvement of technology of practical application, it is meaningful that go into of compressive comminution mechanism of particle beds that establish theoretical foundation for the realization of mechanism and technology parameters of it and developing compressing crushing equipment with new type, high efficiency.The motion characteristic of the moving cone and the rock particle in the crushing cavity were analyzed based on the performance principle of cone crusher; Based on compressive comminution mechanism of particle beds, boundary examination theory and fixed mass priciple the breakage process of cone crusher was studied and mathematical model was established. It was further concluded that through it parameters of rock materials, the operating parameters and structural parameters of cone crusher were essence influencing factor of the process and effects of breakage, the mathematical model about these factors was created by it.The bonded particle model of granite is irregular and different size that can be broken and compress smash model of cone crusher were established with structural parameters and working parameters of the PYB900 cone crusher as input by using the discrete element software EDEM and 3D design software Solidworks. By calculating the volume rate of rock material layer in the crushing cavity the way of compressive comminution of particle beds occurs, though the virtual simulation of crushing process of the cone crusher, crushing behavior, strained condition and motion law were revealed in crushing chamber when rock materials were extrude.Based on the compress smash model of cone crushe, simulation experiment was designed. Simulated parameters of different factors which is the rock grain size, paritcle shape,thickness of feed layer, eccentric speed, swing stroke and nip anglein by obtaining information of broken stones, to investigate the influence rules of product size quality andproductivity; at the same time corresponding made the detailed analysis to concluded that: the smaller porosity of the rock material layer in the crushing cavity, the more helpful compressive comminution of particle beds it is to realize, the higher crushing efficiency, but the smaller rock size and the more flat rock shape, the more difficult it is broken. The optimal value of thickness of feed layer is 520 mm to restrain porosity increasing and ensure potimally dense situation in the crushing process. There are optimal parameters compressive comminution of particle beds for PYB900 cone crusher, the optimal eccentric speed of moving cone is 360 r/min, the optimal value of swing stroke is 43 mm, nip angle of crushing chamber there is an optimal range of 23.5°~ 24.7 °, which make the result of compressive comminution of particle beds best.