... . 3. easy operation,l Roller Drying machine, rotating drying machine, , Introduction:Roller Drying machine Drum dryer, also known as rotary drum ... , building materials, chemical industry, drying coal, limestone, grain, sand, clay and other materials. Roller Drum dryerThe main part of ... then to the feeding end by hopper of feeding machine through charging pipe .Feeding pipeline slopping angle should max ...