Research on characteristics and precision injection angle control system of micro particles blaster cleaning for stone material surface pollutant

For analyzing the injection angle impact of micro particles blaster cleaning system, the numerical twophase flow model of gas-solid is built according to the characteristics of cleaning system, and the injection processes are simulated for different injection angle and soft/hard grinding materials. The simulation results indicate that the injection angle contributes a great influence on average pressure and effective area of cleaning, especially for the soft grinding materials. And concerning the actual operation difficulties of injection angle adjustment, the system is optimized by adding an electrical servo system to control angle of nozzle, which can realize the precise and quick positioning of angle-dimension in the course of cleaning.