The cylinder screen-mesh of this device is placed inside the base machine. The material enters the net tube with airflow mixed and atomization after passing the screw conveyor system; the material is sprayed through the net and discharged from the fine stuff portal in the effect of centrifugal force and the cyclone propelling power, which are caused by the rotor vane inside the net tube. The material, which cannot cross the net, is discharged from the rough stuff portal along the net tube wall.