The machine consists of the base, casing, access to materials propulsion, motors and other components, using a cylindrical mesh structure, is being screened material in the barrel scraper constantly flipping, The formation of the material in the cylinder body constantly updated advance fines that fall in the sieve, the coarse material continue to move forward in the mouth of coarse material climbed out. Reliable with technical performance, running flat Stability, low noise, simple operation.