Rotary drum dryer is one of the traditional drum dryer drying equipment, reliable equipment operation, operating flexibility, adaptability, large capacity, widely used in metallurgy, building materials, chemicals, coal, fertilizer, ore, sand, clay, kaolin, sugar, etc. field diameter: Φ1000-Φ4000, depending on the length and dried claims. In the center of the drum dryer broken up institutions to avoid the increase, the cylinder body into the dry material is wet drum wall repeatedly took a copy board, Paola, in the process of falling were scattered broken device becomes fine particles, a significant increase in specific area, full contact with the hot air drying.