| 摘要 |
PURPOSE: To widen the width of a working pattern, making improvements in blasting work efficiency, and to uniformize the work depth of a blasting work surface as well as to improve the extent of quality in this blasting work surface. CONSTITUTION: An abradant in an abradant inductive chamber 12 is guide into a circumferential ring clearance part lying between a conical inner surface 16 and an air injection pipe 13, riding on an air flow of this air injection pipe 13, and it is sprayed as being conically diffused to the outside from a main nozzle 42. However, this air flow to be sprayed out of two sub nozzles 43 and 43 is sprayed toward almost the same position to this center lineαfrom this side being symmetrized to the center lineαof an abradant injection flow of the main nozzle 42. Therefore, since the conical abradant injection flow of the main nozzle 42 is pressurized in a state that it is made so as to be pinched with injection pressure of this air flow from this side, it is deformed to a fluid section being narrow and slender.
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