College of Mining, NUST MISIS, Moscow, Russia:

G. I. Babokin, Professor, Doctor of Engineering Sciences

Tula State University, Tula, Russia:
D. M. Shprekher, Professor, Associate Professor, Doctor of Engineering Sciences, shpreher-d@yandex.ru

D. S. Ovsyannikov, Post-Graduate Student

Novomoskovsk Institute–Division, Mendeleev University of Chemical Technology of Russia, Novomoskovsk, Russia:
E. B. Kolesnikov, Associate Professor, Candidate of Engineering Sciences

Mining of gently dipping coal seams 0.9–6 m thick is carried out by narrow-cut cutter–loaders. The power consumption in process flows of coal mining and haulage reaches 12–16 % of the total electric energy demand in coal mines. Aimed to reduce the power consumption of coal transportation and to improve reliability of scraper conveyors, the authors put forward an operation algorithm of a system enabling coordinated speed control of a cutter–loader and a conveyor when operated jointly in a face area. The new mathematical model of the scraper conveyor loading represents a pulling member of a scraper conveyor as a sequence of concentrated masses in the number equal to the number of the conveyor sections. The change in the conveyor load is correlated with the cutter–loader position in a longwall at different feed rates of the cutter–loader in parallel motion and in countermotion of the cutter–loader and the conveyor pull. The designed resource-saving speed control for the scraper conveyor drive ensures the constant load flow on the scraper conveyor. Furthermore, the control system enables the minimized and stabilized specific energy consumption by the scraper conveyor at the rated level, and shortens the distance covered by the pulling member of the scraper conveyor per operating cycle of the cutter–loader, which reduces wear of the pulling chains and pans of the scarper conveyors.

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