| 摘要 |
PROBLEM TO BE SOLVED: To supply a fixed quantity of abrasive material to a spouting nozzle from an abrasive material force-feed tank under a stable condition, and set a desired spouting quantity of abrasive easily and positively in a straight hydraulic blasting machine. SOLUTION: This apparatus supplies air pressure to an abrasive material force-feed tank 11, and feeds an abrasive material 15 in the force-feed tank to an abrasive material quantity adjusting tank through an introducing pipe 16 at the lower part thereof with a structure so as to be consolidated with the adjusting tank 12 on the lower part thereof, and equalize the pressure of an compressed air layer 37 on each of the upper parts of both tanks thereto through a pressure-equalizing pipe 45. A collecting rotary disk 21 is mounted on the inside of the abrasive layer 17 of the adjusting tank 12. When the rotary disk is rotated, the abrasive material entering a recessed part in the circumferential surface of the rotary disk and collected is force-fed from a force-feed opening 24 on the rear end in the abrasive material supply direction of an abrasive material supply pipe 14 mounted so as to be brought into close contact with the circumferential surface of the collecting rotary disk 21, and the fixed quantity of abrasive material, passing through the abrasive material supply pipe 14, is spouted to a workpiece from an injecting nozzle 13. By adjusting the rotational speed of the collecting rotary disk 21, it is possible to set desired abrasive supply quantity easily.
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