Suitable for grading and cleaning fine powdery materials in feed, flour, food and chemical industries. On the principle of rotary centrifugal classification and back-blow sifting etc., the machine can grade fines above 30 meshes, which realizes high capacity, fine performance, simple technology and small area occupying. Features: » Belt driving, stable transmission and low noise. » Screen cylinder is made of stainless steel mesh screen, which improves sifting efficiency. » On two sides,large doors are equipped, ease of installation and maintenance. » Through flat nozzles, back blowing on outside screen cylinder wipes out the overs, thereby screen cleaning is guaranteed and the screen blocking is eleminated. » With using rotated drum, every part of the screen cylinder has the opportunity to contact materials, enlarging effective sifting area. » Applying for sifting and grading fine powdery materials in feed, flour, food, chemical, mining and paper making industries.It is mainly used as a process step following fine grinding or ultra-fine grinding so as to decrease effectively repeated grinding.