Extraction of Inclined Exit Ledges in Coal Mines in Presence of Mobile Crushing and Conveyor Complexes

This article presents data on main technological fleet of excavation-loading equipment of mining enterprises of Uzbekistan, which traditionally are consumers of open-pit rope excavators of ECG type. Uzbekistan is traditionally consumer of open-pit rope excavators of ECG type. The data on experience of operation of open-pit hydraulic excavators by mining enterprises of Uzbekistan as of 2022 is given. The methodology of determination of time of working out and productivity of excavator at development of inclined exit ledge in conditions of coal mine Angrensky (Uzbekistan) is given. The calculation of time of working of the exit ledge is made and the average operational productivity of the excavator is determined. The technology of ledge mining by longitudinal drifts with the use of mobile excavator-crushing complexes at the lateral location of the bottom-hole conveyor and the presence of a mobile interstage loader with consecutive mining operations on two horizons is presented. According to the given technological scheme the methodology of determination of the full working cycle of the complex is recommended. The estimation of excavator bucket filling coefficient at different face height and different depth of bucket penetration into the face is carried out. A mathematical model for determining the area of the digging segment of a quarry excavator is developed. The mathematical model of definition of the area of excavation volume for a single digging cycle considering the depth of bucket penetration into the face is proposed for the refined estimation of face parameters.