Fluent material handling – with receiver or receiver coacting mea – Multiple passage filling means for diverse materials or flows – With baffle – spreader – displacer – drip ring – filter or screen
Patent
1984-09-17
1985-12-17
Bell, Jr., Houston S.
Fluent material handling, with receiver or receiver coacting mea
Multiple passage filling means for diverse materials or flows
With baffle, spreader, displacer, drip ring, filter or screen
141392, 141256, B65B 104
Patent
active
045587248
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of transferring a pulverulent material, for example such materials having a propensity to float in the air such as kaolin clay, lime, starch etc., from a store to a site of use or a container, for example a package in the form of a bag, sack, large sack or the like, and a apparatus for carrying out the method.
THE STATE OF THE ART
The handling of pulverulent materials is beset by great problems inherent in the propensity of the particles of the powder to float in the air, a propensity which is greater the smaller the particles are. The problems are particularly manifest with such materials as kaolin clay, lime, starch and so on. These problems inherent in the propensity of the particles to float in the air occur particularly on the transfer of the material from a store to a site of use, a container or a package, for example from a silo to a normal sack or a large sack. In such cases, the problems result in considerable filling times and the filling efficiency will be relatively slight even though filling of the sacks is effected progressively in as much as a certain amount of material is introduced into the sack, whereupon the sack is placed to one side until the floating particles have come to rest, whereafter a further amount of material is introduced into the sack, and so on. However, it has proved that this further amount of material contains a large portion of floating particles and, moreover, a large amount of the particles already at rest in the sack will be caused once again to float in the air. For filling the sack to an acceptable degree, filling must be effected with extreme caution and with very small amounts of material at a time. Such a filling operation becomes extremely time-consuming and, as a result, occasions very high operational costs.
TECHNICAL PROBLEM
The task forming the basis of the present invention is to facilitate the transfer of pulverulent material from a store to, for example, a sack, while as good as completely obviating the problems inherent in the propensity of the particles of the material to float in the air.
The above-mentioned task is solved according to the present invention in that the method disclosed by way of introduction is characterised in that the material is fed to a nozzle by means of a screw conveyor, that air, in which the material floats during the conveyance through the screw conveyor, is removed by suction by the intermediary of a filter surrounding the screw conveyor, and that the material is urged past a damper arrangement by means of the screw conveyor. The air in the container which is to receive the material is removed by suction while the material is urged past the damper arrangement. The speed of the screw conveyor, the removal of air ahead of the damper arrangement, the opening resistance of the damper arrangement and possibly the removal by suction of air from the package are all regulated in dependence upon the desired reduction of particle floatation. The speed of the screw conveyor, the removal by suction of air ahead of the damper arrangement, the opening resistance of the damper arrangement, and possibly the removal by suction of air from the package are each regulated individually or in relation to one another. The package (the sack) is fixedly clamped on the nozzle and is progressively fed downwardly from the nozzle according as it is filled. An apparatus for carrying out the method according to the present invention is characterised in that at least one end portion of a screw conveyor is surrounded by a filter for allowing the passage essentially only of air, that a damper arrangement is disposed at the end of the screw conveyor and the filter, and that the damper arrangement is operative to be opened by the material fed through the filter by means of the screw conveyor. The filter consists of a suitable filter screen forming a circulate drum and frusto-conical rings disposed on the inside of the drum and directed with the end of smaller diameter in a direction towards the damper arrangemen
REFERENCES:
patent: 4162148 (1979-07-01), Furstenberg
patent: 4185669 (1980-01-01), Jevakohoff
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