PECULIARITIES OF COAL SEAMS DESTRUCTION BY EXECUTIVE ORGANS OF MINING MACHINES

When excavating coal seams of complex structure containing strong rock layers and large solid inclusions, the peculiarities of functioning of executive bodies have a great influence on the productivity of mining machines and coal grade. Their design parameters depend on the characteristics of coal mass destructibility, which are random in nature, and on the parameters of cutting tool arrangement schemes, which change in the process of exhausting the resource of the actuator. In this connection the researches were carried out, the purpose of which was to reveal the main features of coal seams destruction by executive bodies of mining machines and how they influence the efficiency of mining machines functioning. It was shown that the task of selecting the parameters of actuators should be solved by achieving the optimum at various combinations of influencing factors, which predetermines the choice of a generalized optimization criterion (target function), allowing to choose the best design of the actuator during operation or to choose its optimal parameters during design. Considerable attention in the study is paid to predicting the reliability of the actuator in the process of exhausting its resource due to toolholder failures. In this connection influencing the process of coal destruction, is the change of parameters of schemes of arrangement of cutters in the process of exhausting the resource of the executive body.