Control mechanism for screening charging barrel of jet mill

The utility model provides a control mechanism of an airflow mill screening charging barrel, which comprises a switch valve assembly, a control assembly for controlling the switch valve assembly, and a connecting arm with two ends respectively connected with the switch valve assembly and the control assembly, the switch valve assembly comprises a valve body and a valve plate, the valve body comprises a vertically through cavity, and the valve plate is arranged in the cavity of the valve body. The connecting arm is provided with a cavity penetrating along the central axis of the connecting arm, the control assembly comprises a transmission shaft inserted into the cavity of the connecting arm, a limiting gear fixed to the outer end of the connecting arm and connected to the transmission shaft in a sleeving mode, and a rotating handle fixedly connected with the outer end of the transmission shaft, and the inner end of the transmission shaft is fixedly connected with a valve plate. The rotating handle comprises a