... variable speed case 2) No need for lubrication 3) No oil leakage SFJY series Rotary vibration sieveFunction ... 2. Changer is easy, simple, easy to clean. 3. Mesh does not block, powder is not flying, ... design, screen using a long time, for only 3-5 minutes faster network. 6. Small size, less ... , its low noise, high efficiency, quick changer take 3-5 minutes, totally enclosed structure for grain, flour, ...