Abstract
The paper deals with certain operation features of «Ural-20R» heading-and-winning machines. It has been proven that the efficient capacity field of such excavation machines is limited by the capacity of the subsequent loading equipment: a worm conveyor and a drag-bar reclaim conveyor. The crushing of potassium rock mass by chisels of the operation devices of «Ural-20R» machines is accompanied by intensive circulation and excessive ore degradation during transportation of the rock mass by single cut worms. Intermittent feeding of the ore to the conveyor stipulates considerable framework vibrations and formation of dynamic loads on the elements of the power drive of the reclaim conveyor. When the winning machine is used in mines with negative inclination angles, the capacity of the drag bar reclaim conveyor is drastically reduced. Based on the analysis of structural features of the worms and the conveyor of «Ural-20R», technical proposals have been made as to the efficiency improvement of potassium ore loading.
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