Method for detecting abnormality in hydraulic system of molding machine and apparatus therefor
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United States of America Patent
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Aug 29, 1995
Grant Date -
N/A
app pub date -
Aug 18, 1994
filing date -
Sep 8, 1993
priority date (Note) -
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Abstract
A method for detecting an abnormality of a hydraulic system in a molding machine which comprises a hydraulic cylinder for reciprocating a movable member of the molding machine, a valve for controlling a hydraulic fluid which is supplied into the hydraulic cylinder, and a pair of pressure sensors attached to the hydraulic cylinder, for detecting the pressures in a pair of pressure chambers of the hydraulic cylinder, is disclosed. The method comprises the steps of: holding the valve at a neutral position, and comparing the pressures in the pair of pressure chambers with a preset range of pressure on the basis of detecting signals from the pair of pressure sensors, when the movable member is inoperative; and outputting an abnormality signal when at least one of the pressures in the pair of pressure chambers is out of the preset range of pressure.
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