Sand blasting is also a mechanical cleaning method, but it is not shot blasting. Sand particles such as quartz sand are used for sand blasting, and metal bullets are used for shot blasting. Among the existing workpiece surface treatment methods, the best cleaning effect is sand blasting. Sand blasting is suitable for cleaning the workpiece surface with high requirements. Dalian sanding and derusting, but at present, most of the general sand blasting equipment in China are composed of original heavy sand conveying machinery such as hinged dragon, scraper and bucket elevator. Users need to build a deep pit and make a waterproof layer to install machinery. The construction cost is high, and the maintenance workload and maintenance cost are huge.