Air knife device of coating machine

The utility model provides an air knife device of a coating machine, which comprises a cavity and an air inlet grille arranged in the cavity, one end of the air inlet grille is fixed on the rear side wall of the cavity, the air inlet grille is divided into an upper layer and a lower layer, and a J-shaped air knife guide mechanism is arranged in a gap of the air inlet grille on the lower layer. Each J-shaped air knife guide mechanism is composed of a vertical guide plate and a bent air knife opening formed in the bottom of the vertical guide plate, a sealing ring is further arranged above the vertical guide plate, and the multiple J-shaped air knife guide mechanisms are not equal in length and are arranged in an air inlet grille gap in a stepped mode according to the set length. And a sealing cover plate is arranged on the front side wall of the cavity. According to the device, the acting pressure of pressurized gas can be inclined to the maximum extent, the gas purging uniformity is effectively improved, solu