LHB-C coarse powder classifier is a ring air classifier. The innovative grading structure is composed of grading assembly, inner and outer cylinders, inner and outer cones, circulating air and fineness adjustment device. The material enters the inside of the classifier through the feed port, and the air flow rises with the fan under the action of the material throwing plate. Under the action of gravity centrifugal force, the coarse powder slides to the inner cone and is discharged from the coarse powder port. The fine powder is discharged through the fine powder port along the inner wall of the outer cylinder under the centrifugal force of the classification impeller and the fan impeller.