Dispensing – With filter – Associated with vent passage
Patent
1982-02-25
1985-04-16
Marmor, Charles A.
Dispensing
With filter
Associated with vent passage
222233, 222241, 198671, B65G 3320
Patent
active
045110662
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention refers to a device used in connection with containers for bulk material such as chipped wood, pellets and similar material; said container including a main part with essentially vertical walls and a converging part for feeding out the material. The device has been developed principally in order to avoid the formation of obstructive bridges or vaults in the container and the device is suitable for containers with square formed or rectangular cross-section, and preferably with a converging part for feeding out the material. A further development of the device can, however, be used as a feeding out device and will in such a case consist of a modified so called tubular feed-out device. A further development of the device is specially adapted to large containers with circular cross-section.
PRESENT ART
Bulk material such as chipped wood, pellets and granulated material has a tendency to agglomerate in form of bridges or vaults in the inside of silos and other containers resulting in an irregular feed-out flow or complete stoppage of the feed-out. Fields of force are built in different formations within the bulk material and they are taken up in the lower parts of the container and specially in the zone of transition between the vertical walls of the container and the converging feed-out part of the container.
Different devices to counteract the building of such vaults are described in a large number of patents, e.g. the Swedish patent descriptions Nos. 352 051 and 390 627. These examples refer to devices in form of cones, which protrude upwards into the bulk material. These devices have, however, certain disadvantages in common. The moving parts of the devices are placed in the lower converging part of the container and can thus not considerably influence the building of vaults, which generally takes place in the transition zone of the container or hereabove. The Swedish patent description No. 394 190 shows a vibration device which is used for loosening the bulk material in the transition zone. This device has, however, the disadvantage that it is highly susceptible of wear and that maintenance- and repair-work is very difficult to carry out. The Swedish patent description No. 409 981 describes a device including a rotating shaft with wings which rotate within the bulk material. One disadvantage of this device is that there is a considerable risk for the rotating arrangement to get stuck. The device requires a huge torque in order to turn the shaft around, which involves considerable risks for the equipment to be damaged. The device is furthermore difficult to reach when it gets stuck and it does not give a reliable loose feeding of material to the feeding-out means in the bottom of the silo, which in this case is essentially flat.
So called tubular feeders are also well known. These devices are formed as a tube or as a drum with holes in its cylindrical surface. The tube is arranged to rotate continuously in a certain direction and a screw feeder is placed coaxially within the tube rotating in an opposite direction in relation to the rotation of the tube. This known device is a very helpful means to feed out bulk material from a container. The rotating movement of the tube requires, however, special transmissions and these transmissions increase the cost of the corresponding devices.
DESCRIPTION OF THE INVENTION
It is an object of the invention to eliminate the above mentioned problems, limitations and disadvantages connected with the use of devices which are known. It is a special object of the invention to offer a device which permits the distribution of the fields of force within the bulk material in the bulk material container thus breaking the tendencies to build vaults and thus permitting the material to reach the bottom of the container in a loose condition and easy to feed out.
Another purpose of the invention is to eliminate the disadvantages and limitations known with the previous so called tubular feeders.
It is another object of the invention to achieve
REFERENCES:
patent: 1038251 (1912-09-01), Wideman
patent: 1566746 (1925-12-01), Herman
patent: 2253945 (1941-08-01), Starrett
patent: 2631969 (1953-03-01), Klueger
patent: 4043488 (1977-08-01), Halvorsen et al.
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