| 摘要 |
PURPOSE:To always keep stable weighing accuracy, by a method wherein flow speed controllers are respectively provided to a plurality of liquid and powder supply containers while a cumulative weighing detector is provided on the side of a receiving container to control the flow speed controllers on the basis of an actually weighed value and a weighing set value. CONSTITUTION:For example, in a weighing and mixing apparatus for weighing and mixing N-kinds of liquids and one kind of a powder, a weighing set value is set to a weighing control apparatus 44 on the basis of a given manufacturing condition and, when weighing start is indicated, a powder storage hopper 30 is operated at first through a change-over apparatus 46. That is, a screw feeder 32 is rotated in the predetermined number of rotations by the driving of a servo motor 31 and a powder is transferred to a receiving container 40. The load cell 42 of the receiving container 40 detects the wt. of the transferred powder and the value thereof is fed back to a weighing control part 44a which in turn operates the next number-of-rotation order from the deviation with the set value to perform the alteration control of a flow speed. In the same way, liquid tanks are successively controlled by opening degree control valves. |
