Shendong Company 7 m large mining height mating scraper conveyor was from German DBT Company, driving power was 3×1 600 kW, CST soft start was used, Shendong Company made frequency conversion renovation to the driving, underground continuous use time was more than 1 a, with output more than 10 million t and stable running, without big electrical and mechanical failure, the technology effectively improved the equipment reliability, reduced the failure rate.