The layout of the polishing head depends on the shape of the workpiece. A set of sand blasting gun equipment is composed of one or more polishing heads and other auxiliary mechanisms. Make all parts of the workpiece within the striking range of the abrasive. Generally speaking, the abrasive flow thrown by each throwing head is fan-shaped, and the effective area is about 900mm long and 75 ~ 100mm wide. The number of polishing heads required for sand blasting in Dalian depends on the size, shape and complexity of the workpiece. The efficiency and cleanliness of sand blasting gun cleaning are not only limited by the number and size of polishing head and the type and quality of abrasive, but also related to the characteristics of workpiece material and other factors. So that all surfaces of the workpiece can be exposed to the impact range of the abrasive. Improper abrasive divergence will impact the sandblasting gun chamber body or workpiece conveying device. Each set of sandblasting gun equipment requires a certain length and width of abrasive divergence flow. Reduce the cleaning efficiency of abrasive, cause abnormal damage to the equipment and increase the maintenance cost. In addition, all parts of the cleaned workpiece should be covered by a certain amount of abrasive, otherwise, some parts of the workpiece surface will have incomplete cleaning or abrasive impact transition.