Conveyors: fluid current – With diverse power-driven conveyor – Rotary
Patent
1997-03-24
2000-01-04
Noland, Kenneth
Conveyors: fluid current
With diverse power-driven conveyor
Rotary
406 67, B65G 5308
Patent
active
060102802
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for transferring bulk goods between two successively coupled conveyors, the first being a supplying conveyor and the second a discharging conveyor, a transition housing being arranged between the supplying conveyor and the discharging conveyor.
Such an apparatus is disclosed in Swedish Patent SE-B-406,070. In this case, the transition occurs between two conveyors which can be swung relative to one another by a transition housing being formed between the two conveyors and having a rotationally symmetrical labyrinth seal between two portions in the transition housing, which are rotatable relative to one another. This known apparatus has excellent properties for transferring goods from one screw conveyor to another. When transferring goods from a screw conveyor to a pneumatic conveyor, it has been found that this type of transition housing does not result in the desired function since the transfer must be carried out at a very high material conveying speed and since the air pressure in the pneumatic conveyor acts on the supplied goods in the screw conveyor.
It is per se known from Austrian Patent AT-B-391,675 to transfer bulk goods from a screw conveyor to a pneumatic conveyor, but this prior-art apparatus suffers from several drawbacks. Such a drawback arises by the flow of goods in this apparatus being fed radially into a gas flow which flows at high speed so as to be entrained by the gas flow into the tubing of the pneumatic conveyor. Therefore, this design also has the drawback that the air pressure in the pneumatic conveyor acts directly on the goods supplied by the screw conveyor. This in turn results in an impairment of the function of the screw conveyor and, if it comes to the worst, stoppage in the screw conveyor.
EP-A-0,122,621 discloses another apparatus for transferring bulk goods from a screw conveyor to a pneumatic conveyor. In this prior-art apparatus, a transition housing is arranged at the discharge end of the screw conveyor. Within this transition housing, the screw of the screw conveyor is extended by two discharge screw portions having flights of opposite threading for directing the flow of material towards a radial outlet in the housing. The air required for suspending the bulk goods is supplied at opposite ends of the transition housing to make the air flush the goods along the flights of the discharge screws and discharge the goods through the radial outlet. Also in this known apparatus, the excess pressure in the transition housing will act directly on the bulk goods in the screw conveyor. Thus, also this apparatus suffers from the above-mentioned drawbacks.
A possibility of obviating the problems that arise when the excess pressure in the pneumatic conveyor acts directly on the goods conveyed in the screw conveyor, is to continuously operate the screw conveyor completely filled. This is, however, not always possible or desirable.
It is actually known to use cellular feeders for transferring bulk goods from a feed hopper to a pneumatic conveyor. An example of such a known apparatus is to be found in EP-A-0 086 312. One more example of such a transferring or dosing device is disclosed in U.S. Pat. No. 4,015,754. In these known feeding devices for pneumatic conveyors, it is a matter of transferring goods from a slowly moving storage of material to a rapid air flow.
None of the above-mentioned known apparatus having a cellular feeder aims at transferring goods from a screw conveyor to a pneumatic conveyor. In fact, it would be possible to let the goods from the discharge end of the screw conveyor fall into an inlet hopper of a known cellular feeder as disclosed in GB-A-2,038,751, but such a construction is not very efficient. If the inlet hopper to the cellular feeder is open, this technique may besides cause dust formation. In addition, this solution of the transfer problem could not be used in screw conveyors operating with large, rapid flows of material, for instance 150 tonnes/h or more.
The above-mentioned GB-A-2,038,751 permits the mater
REFERENCES:
patent: 3130879 (1964-04-01), Messing
patent: 3220539 (1965-11-01), Anagnos
patent: 5299888 (1994-04-01), Wysong et al.
patent: 5562366 (1996-10-01), Paulson
BMH Marine AB
Crawford Gene O.
Noland Kenneth
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