| 摘要 |
PROBLEM TO BE SOLVED: To provide an abrasive grains blasting device to work with air pressure, free of stagnation of abrasive grains or the device being clogged therewith and capable of blasting a proper quantity of abrasive grains continuously at all times. SOLUTION: The abrasive grains blasting device is composed of a reservoir tank having an eject port for abrasive grains, a conduit passage for compressed air, a grain supply controlling means installed at the eject port of the tank, an acceleration chamber whereto the downstream outlets of the supply controlling means and the conduit passage for compressed air are connected, and a blasting nozzle connected with the downstream of the acceleration chamber. The acceleration chamber consists in a conical cylinder whose inner diameter lessens gradually toward the downstream. The controlling means works in controlling the rotation of a valve to allow the grains to fall naturally by opening and closing of the eject port and a screw conveyor able to make forced ejection of the grains through the eject port. The tank may be equipped in the lower part with a gradient for the flow of abrasive grains being directed to the eject port or a device to apply vibrations or impacts. COPYRIGHT: (C)2006,JPO&NCIPI
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