Shot blasting is used for regular shapes, and several heads are used together, with high efficiency and low pollution. Shot blasting and sandblasting are commonly used in the shipbuilding industry. However, whether it is shot blasting or sandblasting, compressed air is used. Of course, high-speed rotating impellers are not necessary for shot blasting. In the repair and shipbuilding industry, shot blasting (small steel shot) is generally used for steel plate pretreatment (rust removal before painting); Sandblasting (used in the shipbuilding industry as mineral sand) is often used in formed ships or sections to remove old paint and rust from steel plates and repaint them. In repair, shipbuilding, shot blasting, and sandblasting are mainly used to increase the adhesion of steel plate coating paint Shot blasting is a method of cleaning the surface of a part by using a high-speed rotating impeller to throw small steel or iron balls out and impact the surface of the part at high speed, thus removing the oxide layer on the surface of the part. At the same time, the steel or iron balls collide with the surface of the part at high speed, causing lattice distortion and deformation on the surface of the part, increasing surface hardness. Shot blasting is commonly used for cleaning the surface of castings or strengthening the surface of parts.