Shot blasting technology is originated in Europe, has a history of over one hundred years, the principle is:  material (metal or non-metallic ) fed to the blast wheel is accelerated, and obtain greater kinetic energy, shock or impact on the workpiece surface with high speed so as to achieve the effect of pretreatment such as derusting deburring, surface hardening and so on. The process is similar  with the centrifugal pump .Abrasive 5 fed by the chute from the axial direction, with the shaft rotating high speed, accelerated by impeller 1, due to the effect of centrifugal force, through the control cage 3 openings and then thrown onto the blade 2 directly, once again being accelerated, and then forms a abrasive stream 4 thrown onto the surface of the workpiece.

As shown in Figure