Mitsubishi Jukogyo Kabushiki Kaisha

Tamotsu Oka

Nagio Minami

Hirokazu Wada

A hydraulic blasting apparatus has an abrasive storage tank disposed operatively between an abrasive recovery tank and a hydraulic pressurized tank. The abrasive storage tank is provided with a first valve openable from the inside of the storage tank to the atmospheric pressure, and also with a second valve to open the connection between the storage tank and the recovery tank and with a third valve to open the connection between the storage tank and the pressurized tank. The pressure in the abrasive storage tank will become the same as the atmospheric pressure by opening the first valve. Next the first and second valve are closed, and after that the third valve is opened so as to drop the abrasive only into the pressurized abrasive tank for a recycle use.

Continuously-operable abrasive blasting apparatus

A powdery material supply valve mechanism including a valve means disposed in front of a piston rod means in a longitudinally aligned relationship with each other, a valve housing means incorporating operatively the valve means and the piston rod means therein and a valve cylinder/piston means. This valve cylinder means is disposed shiftably in the longitudinal direction relative to the valve housing means, and a valve piston means disposed slidably in the bore of the cylinder means along the axis thereof to be urged operatively upon a valve seat of the valve housing means against the resilient force of a valve spring means under the effect of operating fluid pressure fed to the valve cylinder means, while the valve means is opened away from its valve seat with the resilient force of the valve spring means, when the operating fluid pressure is opened to the atmosphere. As the valve piston means stops abutting upon the end wall surface of the valve cylinder means, the current position of the cylinder end wall may determine a current degree of opening of the valve means. This position of the cylinder end wall may be set optionally with an adjustable longitudinal shifting of the valve cylinder means relative to the valve housing means.

Growing community of inventors

Hiroshima, Japan

Tamotsu Oka