Experimental study on impact wear characteristics of the skip liner under different impact velocities and coal types

Abstract

The skip liner is a primary wearing component that is subjected to direct impacts and friction from coal in the mineshaft hoisting system. In this research, a skip tester was designed to investigate the impact wear characteristics of liner such as the wear quantity, impact load, and wear morphology under different impact velocities and coal types. The discrete element method (DEM) simulation was used to predict the wear distribution and load behavior for different coal particle sizes. The experimental results show that the wear failure of the liner is due to impact wear and abrasive wear. The impact velocity has significant effects on all three evaluation indices, and a larger impact velocity causes a greater wear degree. Three evaluation indices show that the coking coal causes a higher impact wear. In addition, the DEM simulation results show that the coal particle size has a significant influence on the impact load of the liner, the normal cumulative contact energy increases with the increase of the coal particle size, but the tangential cumulative contact energy decreases with the increase of the coal particle size. The use of a DEM simulation can predict the regions subjected to wear in the skip and the dynamic behavior of the coal particles, which provide a method for optimizing the parameters of coal particles and for improving the service life of the skip liner.