In addition to the frame transmission parts, the rest are 304 stainless steel sanitary production, screen first punch, after mechanical volume processing, so that does not hurt in the course material, mesh aperture can be designed according to user requirements, product by upgrade technology to the grading machine inside, due to the driving role of the drum in a non-stop operation, the material from small to large grading out. The raw materials can be divided into 3-8 grade, suitable for mushrooms, water chestnuts, grapes, longan and other round materials products were graded according to different size specifications.