The machine is mainly used for shot blast and rust removal before paint coating of bulldozer ,road machine, loading machine and components to remove welding slag ,roll scale and other feculence and obtain clean metal surface with certain roughness. When using this machine to do shot blast, there are benefits bring new commercial opportunities to manufacturers, the workpiece after shot blast could obtain even clean metal surface with certain roughness to promote erosion resistance of mechanical products and metal material, get rid of welding stress of components and enhance their fatigue strength to obtain permanent use life, strengthen adhesive strength of paint film and improve decoration quality and antisepsis effect of workpiece.