| 摘要 |
PURPOSE:To eliminate remarkably an influence of an error factor of a bunker weighing device by bringing the weight of a raw material which has been measured in advance before throwing it into a bunker, and the total weight of the bunker which has been measured by the bunker weighing device, to an arithmetic processing, determining a relational expression of an output of the bunker weighing device and a load, and weighing the raw material in the bunker, based on its relational expression. CONSTITUTION:An arithmetic processor 17 processes a data from load cells 14-16, and first of all, a relation of an output of the load cell 14 and a load in a point A - a point D is derived and stored. Subsequently, data related to the point A - the point D are processed statitically by the minimum square-law approximation, etc., a load cell characteristic is divided into a load increase time (the point A - the point B) and a load decrease time (the point C - the point D), and its standard approximation curve is derived. a storage arithmetic unit 17 converts the output of the load cell 14 to a load by using the standard approximation curve which has been derived in this way. Accordingly, among errors of the load cell 14, an error related to non- linearity and hysteresis of a load cell characteristic, and a variation of an origin A and a variation of an output caused by a temperature change is eliminated.
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