Air knife assembly

The utility model discloses an air knife assembly. The air knife assembly comprises an air knife, a connecting spring, an air pipe joint and an air knife cover plate, the two air knives are movably connected through a connecting spring; rectangular sliding grooves are formed in the opposite faces of the air knives. The rectangular chute is used for conveying a material belt; an air outlet inclinedsurface is arranged on the side edge of the air knife; the air outlet slope is provided with an air gathering groove, the air knife is provided with a ventilation channel communicated with the air gathering groove, an air pipe connector is installed at an opening of the ventilation channel, the air outlet slope packages the air knife cover plate, the bottom face of the air knife cover plate is provided with an air outlet groove matched with the air gathering groove, the air outlet groove is obliquely formed like the air outlet slope, and the air outlet groove points to the material belt. By means of the mode, the air