Method for detecting abnormality in hydraulic system of molding

Details Method for detecting abnormality in hydraulic system of molding Method for detecting abnormality in hydraulic system of molding

1994-08-18

1995-08-29

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

425136, 425151, 425167, 425169, B29C 4582, B29C 3324

Patent

active

054457734

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.

REFERENCES:
patent: 4252174 (1981-02-01), Miki et al.
patent: 5007817 (1991-04-01), Wallis

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