... .good performance. 3. easy operation,l Roller Drying machine, rotating drying machine, , Introduction:Roller Drying machine Drum dryer, also known as ... , drying coal, limestone, grain, sand, clay and other materials. Roller Drum dryerThe main part of the drum dryer for a ... of gravity flow to the lower end . Due to the dryer were under the negative pressure working conditions, feeding and discharging ...