Based on the pickling craft,the author analyzes the different states from thread,tension,running to ending, and builds a PID speed control system by the measurement for quantity of the freestyle accumulation.

According to the particularity of the tailing-in work on 10508 coal-planer working face in Malan Coal Mine,this paper determines the tailing-in technique on the working face,and advances some improving suggestions according to the problems occurring in the course of tailing-in work.

Numerical simulation of surrounding rock stability of finishing cut in fully mechanized top coal caving;