The roller screen is suitable for screening materials with various properties, as well as wet and easily blocked materials such as coal, coke and lime, stone yards and other industries, so it is also called mine roller screen. The maximum size of the products under the screen is 1mm, the middle is 1 ~ 5 mm, and the thinnest can be less than or equal to 3 mm. First, the quarry is used for grading large and small stones, and separating soil and stone powder; Second, the use of sand and gravel is separated from sand and gravel; Three, the coal industry for lump coal and pulverized coal separation and coal washing (part of coal washing machinery); Four, chemical industry, mineral processing industry is used to classify large and small blocks and separate powdery substances.