초록 ▼

A liquid or powder measurement apparatus, usable also for mixing a plurality of measured materials and for distributing the mixture to a plurality of dispensing containers. A flow control valve having a wide flow rate range and excellent linearity between the degree of valve opening and flow rate is

A liquid or powder measurement apparatus, usable also for mixing a plurality of measured materials and for distributing the mixture to a plurality of dispensing containers. A flow control valve having a wide flow rate range and excellent linearity between the degree of valve opening and flow rate is disposed in each of the liquid flow paths and is adjustable to have a flow rate linearly varying with the stroke of the valve. A mixing container receives the raw material from one or more supply containers and is weighed by a load cell to thereby detect the amount of material flowing into or out of the mixing container. A control unit operating according to fuzzy logic compares the measured weight with a target weight and accordingly adjusts the flow rate of a selected one of the flow regulators. The same load cell and control unit can also control the flows from the mixing containers to the dispensing containers.

대표청구항 ▼

A closed loop measuring apparatus, comprising: a supply tank containing a stock material; a motor; a flow regulating valve attached to an outlet of said tank and having a linear stroke controlled by an operation of said motor, said valve providing a flow rate therethrough of said stock material whic

A closed loop measuring apparatus, comprising: a supply tank containing a stock material; a motor; a flow regulating valve attached to an outlet of said tank and having a linear stroke controlled by an operation of said motor, said valve providing a flow rate therethrough of said stock material which is substantially linear with said stroke and which is finely controlled over an entire range of flow rates between a closed position of said valve to a fully open position; a detector for measuring a quantity of said stock material transferred through said valve; and a control unit receiving an output of said detector and a measurement target value and controlling said motor in a successive closed loop operation cycle.