Reducer pair wheel, also called reducer back wheel, is suitable for coal mine transportation equipment - scraper conveyor, mainly used for the connection of the reducer and motor of the transmission part of the scraper head, 40 type pair of wheels, suitable for SGB620 / 40T and SGB420 / 40 scraper conveyors are divided into thick neck and thin neck, which can be used. The small scraper can be used with the motor wheel, using the wheel pin connection, or can be coupled Instead of the reducer to wheel connection.