Automatic feeder of pneumatic conveyer

The invention discloses an automatic feeder of a pneumatic conveyer. The automatic feeder comprises a Roots blower, an air pipe, a transmitting tank, a feed port, a discharge port, rotary blades, an upper flange and a lower flange. Materials enter the transmitting tank through the feed port and rotate to the lower flange together with the rotating blades to fall. The automatic feeder is characterized in that an air nozzle is arranged on the outer side wall of the transmitting tank, and a connecting pipe is arranged below the discharge port; wind power provided by the Roots blower of the pneumatic conveyer is divided into two parts through the air pipe, one part of the wind power is connected with the air nozzle and passes through a pneumatic pipeline to drive the conveying blades of the feeder to rotate, and the other part of the wind power is connected with the connecting pipe and conveys the materials falling down from the discharge port. By means of the automatic feeder, the wind power resources of the air source Roots blower of the pneumatic conveyer are fully utilized without independently providing another transmission device, the occupied space is reduced, the use requirements of a user are met, and the automatic feeding is achieved.