Conveyors: fluid current – Ambulant or portable
Patent
1992-05-27
1993-08-24
Mitchell, David M.
Conveyors: fluid current
Ambulant or portable
406 39, 406146, 406153, 294 6823, B65G 5318
Patent
active
052383326
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a device for the handling of bulk material comprising a pressure vessel with at least two members for mechanically enclosing a volume of bulk material, and a conduit connected to the pressure vessel for supplying a pressurized gas thereto for conveying the enclosed material by way of a discharge conduit.
Bulk material can be of different kinds, and the loading and unloading thereof raises many problems. Some materials such as cement and powdered coal are dust emitting, and other types of material will issue odors.
Mechanical as well as pneumatic conveyors have been proposed, and also combination of such means. When big volumes of material must be handled at a certain place, it is possible to errect a permanent plant with high efficiency.
For applications in which smaller quantities are involved, which are collected or delivered at different places, or handling of bulb material is only occasionally required, a proper device has not been available up to now, which at reasonable installing costs has been able to perform the necessary handling service.
A common field of use for such handling devices is marine transportation, where a ship may have to deliver part of its cargo at different ports, which lack proper handling devices. Other applications enclose or plant, which is serviced occasionally by ships lacking unloading means, but having to deliver some bulk material.
German published document DE-B-1 280 158 discloses a transport container for bulk material, having three separate chambers, each with an inlet opening and an outlet conduit and pneumatic means for promoting discharge of bulk material from the container. Apart from these openings, the container is closed to the atmosphere.
The object of the present invention is to propose a handling device, which is cheap to manufacture, which is mobile, and which in an advantageous manner can handle dust material.
For pneumatic transportation it is advantageous to enclose the material in a pressure vessel, from which it may be blown out. Several ways of filling the pressure vessel as a first step in the handling have been proposed, but have not worked satisfactorily.
SUMMARY OF THE INVENTION
According to the present invention the pressure vessel is designed as a grabbing means in the form of two interconnecting shovel halves, which itself will collect a quantity of material, suitable for the next step of transportation. The device is characterized by that the members are provided with means for moving them between an open and a closed position, for grabbing an amount of bulk material.
The device is further characterized by the two members, respectively, the pressure vessel, being provided with means for moving them between an open and a closed position for grabbing an amount of bulk material. Furthermore, a discharge conduit connected to the pressure vessel for conveying the volume of bulk material out of said pressure vessel by means of the pressurized gas is provided.
At least one of the members of the pressure vessel is then provided with a permeable, gridlike bottom structure and a conduit for the supply of pressurized gas opens below said bottom structure. The two members are substantially identical halves of the pressure vessel, and the device further comprises a yoke to which the halves are pivotably connected. The means for moving the two members between an open and closed position are pressure fluid activated actuators for pivoting the halves relative to the yoke. The pressure vessel thus preferably comprises two substantially similar halves (shovel halves) which are pivotably carried in a yoke and connected to pressure fluid actuators for swinging the halves in relation to the yoke. Advantageously, each one of the halves is provided with a permeable, grid-like bottom structure and has an end plate, the end plates facing away from one another in the closed position of the pressure vessel. The halves, in the closed position, abut at a plan of division of the pressure vessel. The bottom structure is
REFERENCES:
patent: 2915339 (1959-12-01), Lusted
patent: 4129329 (1978-12-01), Longo
patent: 4385780 (1983-05-01), Grush
patent: 4411388 (1983-10-01), Muck
Aumund Forderebau GmbH Maschinenfabrik
Becker Robert W. & Associates
Hoge Gary C.
Mitchell David M.
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