Automatic powder spraying and feeding device

The utility model discloses an automatic powder spraying and feeding device, which belongs to the technical field of flue gas purification equipment, and comprises a frame body, a powder bin, a weighing mechanism and a powder spraying mechanism, the powder bin is arranged on the frame body, the lower end of the powder bin is provided with a blanking port, and a first blanking valve is arranged at the blanking port; the powder spraying mechanism comprises an air blower, a feeder, a powder spraying pipe and a powder spraying gun, the air outlet end of the air blower is communicated with one end of the powder spraying pipe, the upper end of the feeder is connected with the material weighing mechanism, and the lower end of the feeder is communicated with the side wall, close to one end of the air blower, of the powder spraying pipe; the powder spray gun is arranged at the end, away from the air blower, of the powder spraying pipe and used for stretching into the asphalt smoke header pipe. The powder feeding devic