Abstract: Coal unloading coal operations automation to improve the efficiency of coal production has important significance, but large capacity skip using curved rail unloading way exists large impact force, serious damage phenomenon, in order to solve this problem, this paper selects 50 tons of shaft large coal skip on curved rail automatic unloading, from the dump rail theory analysis of forecasting the loading and unloading time. To solve handling coordination problems and provide basis; and through design and adjustment of skip parameters, get the desired curve, to meet the coal unloading stress changes in demand.