Spiral knife roll chopper with air duct structure

The utility model belongs to the technical field of cutters, particularly relates to a spiral knife roll cutter with an air duct structure, and aims to solve the problems of dust removal and screening, and adopts the following scheme that the spiral knife roll cutter comprises a first shell; the upper surface of the first shell is fixedly connected with a protective cover; the rear surface of the first shell is fixedly connected with a second shell; the upper surface of the second shell is fixedly connected with a third shell; the inner bottom surface of the third shell is fixedly connected with a motor; a first spiral knife roll is rotationally mounted on the inner surface of one side of the first shell. When the first spiral knife roll and the second spiral knife roll are started, a fan can be driven to rotate, and the size of air is adjusted by pulling a pull rod, so that crushed materials are screened; and through arrangement of a limiting hole, a sliding groove, a sliding rod and a baffle, the adjusted f