The effects of impact velocity on energy and size distribution of rock crushing

In order to study the effects of impact velocity on the energy and size distribution of rock crushing,the fracture energy consumption expression of rock impact crushing was established based on fracture mechanics theory,and a Weibull distribution expression for describing the size distribution of rock impact crushing was also developed.Based on these,the effects of impact velocity on energy and size distribution were investigated.Furthermore,the experiments on rock crushing with different impact velocities were performed in the test bed of impact crushing,and the results show that impact velocity has few effects on size distribution;the Weibull distribution expression can adequately characterize the quality cumulative probability of rock crushing under different impact velocities.However,as impact velocity rises,the rock crushing characteristic index(CCI) increases at exponential speed and the rock crushing degree index(CDI) decreases also at exponential function speed.With the increase of impact velocity,the fracture energy consumption and dissipation energy of rock impact crushing all increase,but the efficiency of energy utilization decreases and the dissipative rate of energy increases at an exponential function speed.