Raw Coal Impurity Automatic Separator This invention relates to a raw coal impurity automatic separator that comprises a rack and a shell, wherein the shell is internally provided with a rotating shaft set on the rack. The rotating shaft is distributed with shift teeth and Archimedes-spiral-shaped scraping plates are fixed on the rack and are symmetrical arranged corresponding to the shift teeth. The shift teeth are correspondingly arranged in shift tooth gaps between the scraping plates, and each shift tooth is sleeved with a slide block. The slide block is provided with upper and lower rollers, between which the scrapping plates are set. A raw coal inlet is provided corresponding to the upper part of an inner cavity of the shell, a raw coal outlet is set on the lower part thereof and an impurity outlet is set corresponding to the tail end of the curved scraping plates. The separator can remove soft impurity in granular materials in industries, such as thermal power (heat) generation, coal mines, raw coal application, ports and wharfs, metallurgy, building materials, and the like. (Fig-1)
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