After the clean cabin with a prescribed number of workpiece, close the door, start the machine, the workpiece is drives the roller, began to flip, and shot blasting machine, high-speed throws the projectile formed fan beam, uniform blow in the workpiece surface, so as to achieve the purpose of cleaning. Projectiles thrown and sand from the small holes on the track, into the bottom of the screw conveyor, by spiral feeder into the elevator, by hoist mentioned separator for separation. Dust containing gas by the blower to filter into the dust collector, into the air, into the atmosphere, the dust by the air back into the dust collector in the bottom of the dust box, the user can be cleaned regularly. Waste sand from the waste pipe outflow, the user can return to use. Pill sand mixture by using tube and recycled into the chamber body, until after the separation and reuse. Shot blasting machine arrangement through 3D dynamic simulation, layout all the angle and position were designed by computer determined. On the basis of care for all the need to clean the workpiece, as far as possible to reduce the empty throw, so as to maximize the use of the projectile, reducing the wear of the cleaning room.