Air knife thickness correcting device for flat pipe brazing

The utility model belongs to the technical field of flat pipe brazing. The air knife thickness correcting device for flat pipe brazing comprises an air knife, the device comprises a flat pipe and an air knife positioning plate, the two air knife bodies are fixed on the air knife positioning plate; air outlets of the two air knife bodies are oppositely arranged; a gap is reserved between the two air knife bodies; the flat pipe vertically penetrates through the distance between the two air knife bodies through the guide wheel set. The included angle between the air outlet directions of the two air knife bodies and the flat pipe is 45 degrees; the air knife body comprises an upper cover plate and a lower cover plate. Wherein the upper cover plate and the lower cover plate are assembled to form an air duct, a middle gasket is assembled between the upper cover plate and the lower cover plate, the middle gasket is in a door shape, the middle gasket, the upper cover plate and the lower coverplate are assembled to fo