PURPOSE: To perform the weighing and mixing of a powder always with high accuracy, by respectively providing flow speed controllers to a plurality of supply containers and providing a powder amount detector on the side of a receiving container to control the flow speed controllers on the basis of a detected actually weighed value and a weighing set value.
CONSTITUTION: The indication of a storage hopper becoming a mixing object, weighing order, a mixing condition or the like are indicated to a weighing control apparatus 17 and a weighing set value is subsequently set. When weighing start is indicated, for example, the screw feeder 12 of a storage hopper 1 selected by a change-over apparatus 19 is rotate in the set number of rotations to transfer a powder to a weighing hopper 14. The load cell 15 of the weighing hopper 14 detects the wt. of the transferred powder and the value thereof is fed back to a weighing control part. In the weighing control part, the deviation between an actual wt. value and the set value is calculated and the proper number of rotations are indicated to the screw feeder 12 at the next control cycle. In the same way, the amount of the powder from each storage hopper is subjected to weighing control.
MATSUI KEIZO
KOBAYASHI CHUZO
ONISHI HIROSHI
| JP42011194A |
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