In the process of sand blasting and shot blasting in Dalian, the electrically controlled adjustable speed conveying roller table sends the steel structure or steel into the cleaning machine room, and the shot Di sand passes through the shot blasting machine area. All sides of its body are hit and rubbed by strong dense bullets from different coordinate directions, so that the oxide scale, rust layer and dirt on it fall off quickly, and the steel surface will obtain a smooth surface with a certain roughness, Load and unload workpieces on the inlet and outlet roller tables on both sides of the cleaning room. The shot and rust dust falling on the steel are purged by the purging device, and the scattered shot dust mixture is transported to the chamber funnel by the recovery screw, collected at the lower part of the elevator by the vertical and horizontal screw conveyor, and then lifted to the separator at the upper part of the machine. The separated pure shot falls into the separator hopper for shot blasting. The dust generated during shot blasting is sent to the dust removal system by the exhaust pipe. The purified gas after purification is discharged into the atmosphere, and the granular dust is captured and collected. Generally, it is divided into roller table type and catenary type shot blasting machine.