Negative-pressure feeding dense-phase conveying system

The utility model discloses a negative pressure feeding dense phase conveying system which comprises a negative pressure material suction tank, a material source bin, a material suction pipeline and a control device, the top of the negative pressure material suction tank is provided with a negative pressure generator, the inner top face of the negative pressure material suction tank is provided with a level gage, one side of the negative pressure material suction tank is provided with an air inlet valve, and the bottom of the negative pressure material suction tank is provided with a discharging valve. The negative pressure generator is connected with a first gas source through a gas inlet pipeline, the material source bin is arranged on one side of the negative pressure material suction tank, a material suction disc is arranged at the bottom of the material source bin, a plurality of gas injection valves are arranged on the material suction pipeline and connected with a second gas source through gas pipes, a