Spiral airflow sorting machine for fine coal

The invention belongs to the technical field of fine coal dry separation, and solves the problems of difficult density control and complex process of fine coal dry separation on the premise of ensuring the separation precision. According to the fine coal spiral airflow sorting machine, an inner cavity of a spiral airflow sorting groove is separated through a plurality of air distribution plates in the groove height direction, a cavity formed by the air distribution plates, an inner edge plate, an outer edge plate and a groove top of the spiral airflow sorting groove serves as a sorting chamber, and a cavity formed by the air distribution plates, the inner edge plate, the outer edge plate and the groove bottom of the spiral airflow sorting groove serves as a blast chamber. A plurality of groove bottom airflow nozzles for providing vertical pulse airflow for the sorting chamber are arranged at the bottom of the blast chamber at intervals in the spiral line direction of the spiral airflow sorting groove, and a p