Dalian sand blasting and shot blasting processing said that generally, shot blasting is used for regular shapes. How many polishing heads are about the same height, high efficiency and small infection. Shot blasting and sand blasting are widely used in repair and shipbuilding industry. However, both shot blasting and sand blasting are the application of compressed air. Of course, it is not shot blasting that requires a high-speed rotating impeller. In the repair and shipbuilding industry, shot blasting (small steel shot) is generally used in steel plate pretreatment (rust removal before coating); Sand blasting (mineral sand used in repair and shipbuilding) is mostly used in formed ships or sections. Its function is to remove the old paint and rust on the steel plate and paint it again. In the repair and shipbuilding industry, the important role of shot blasting and sand blasting is to increase the adhesion of steel plate coating paint.