Hunan Chenzhou Grain & Oil Machinery Co., Ltd, was established in 1967, It is specialized in developing the grain processing and storing machinery. In the past thirty years, we have developed nineteen series of machinery, including cleaning machine, suction type dry stoner, gravity paddy separator, thickness grading machine, rice whitener, rice polisher, rice grading machine, indented cylinder, electronic automatic scale, the complete set of rice processing line, the grain stocking equipment and auto-control system, etc. For more than sixty kinds of products we have the Intellectual property pights, and have twenty nationsl patents, especially the vertical double-roller rice whitener and the vertical double-roller rice polisher have won the second places of the nNational scientific and technical Progress prize for their unique structures and leading technical functions in the whole of China.