Abstract: In the sorting bed, the material to be sorted enters into the pulsating hot air drying stage, and is dried and upgraded under the effect of air flow and high-temperature hot air, the material enters into the pulsating cold wind sorting stage under the effect of scraper conveyors which are parallely arranged up and down inside. The light products and heavy products sorted and layered are respectively conveyed to fine coal and gangue discharging outlets at both ends of the sorting machine. The float and hypostasis at the corresponding discharging ends are respectively discharged by light product discharging wheel and heavy product discharging wheel. At the discharging ends, the material is removed from the sorted light material and heavy material and the medium is purified and recycled to use through subsequent process. The dry sorted air containing vapor and dust is purified and recycled through a subsequent dust removal process.