| 摘要 |
PURPOSE:To reduce the frictional resistance between the wall surface of a hopper and a granular material to enhance the discharge ability thereof, by previously classifying particles in the material to be reserved in a hopper, with the use of a classifying device, so that large size particles is fed in the hopper in the vicinity of the wall surface thereof while the small size particles is fed thereinto at the center thereof. CONSTITUTION:Granular material are fed in the vicinity of the center of the upper surface of a rotary disc 7 by means of granular material supply ducts 10, 10'. Then, large size particles is scattered toward the wall surface of a hopper 2 away from the center thereof while small size particles are scattered around the center of the hopper 2. It is well-known that the frictional coefficient of large size particles is small with respect to a wall surface in comparison with that of small size particles. Accordingly, when a granular material is fed into the hopper 2 as in the above-mentioned process, the frictional resistance between the granular material and the wall surface of the hopper may be reduced, thereby it is possible to enhance the discharge ability of the granular material.
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