| 摘要 |
PROBLEM TO BE SOLVED: To supply fine powder and granular material to an injection nozzle in a direct pressure type blast processing device without causing it to aggregate.SOLUTION: In a direct pressure type blast processing device 1 provided with a pressure tank 11, a granular material acceleration passage 12 where granular material in the pressure tank 11 is introduced, a granular material supply pipe 13 for communicating the granular material acceleration passage 12 and an injection nozzle 40, a compressed gas supply source (not illustrated) for introducing compressed gas 2 to the pressure tank 11 and the granular material acceleration passage 12, the pressure of the compressed gas introduced to the pressure tank 11 and the granular material acceleration passage 12 is caused to be changed repeatedly by a predetermined pressure difference or more. The gas present in a gap between the granular materials repeats compression and expansion by this pressure change, thereby preventing the aggregation of the granular material, and securing fluidity. |
