Method of measuring operation characteristic of proportional...

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 21/02 (2006.01) B29C 45/77 (2006.01) B29C 45/82 (2006.01) F15B 19/00 (2006.01) G05D 16/20 (2006.01)

Patent

CA 2228554

The present invention relates to a method by which an operation characteristic of a proportional electromagnetic control valve can be automatically measured in a short period of time. For this purpose, in the operation characteristic measuring method of the present invention, when the proportional electromagnetic control valve to be measured is a proportional electromagnetic pressure control valve, at each step for measuring a pressure of a hydraulic circuit, the pressure is measured with a predetermined interval of time, the pressure is assumed to be stabilized at a point of time when a difference ~P between thus measured pressure value and the previously measured pressure value becomes a predetermined level e or less, and the measured pressure value at this point of time is employed as a pressure corresponding to a load current at this step. The present invention is used at the time when an injection molding machine is inspected at its manufacturing site upon shipping and at the time when the injection molding machine is controlled while being actually operated.

La présente invention a trait à une méthode de mesure automatique rapide du fonctionnement d'une vanne électromagnétique de régulation proportionnelle. Ainsi, à chaque étape du processus de mesure de la pression dans un circuit hydraulique d'une vanne électromagnétique de contrôle proportionnel de la pression en fonctionnement, la pression est mesurée, selon la méthode visée par l'invention, à intervalles prédéterminés, et cette pression est jugée stabilisée lorsque la différence P entre la valeur de pression mesurée à cette étape et la valeur de pression précédemment mesurée correspond au niveau prédéterminé e ou à un niveau inférieur à celui-ci. La valeur de pression mesurée est ensuite utilisée en tant que pression correspondant au courant de charge à cette étape. La méthode faisant l'objet de la présente invention est utilisée au moment où une machine à mouler par injection est inspectée sur les lieux de fabrication avant son expédition et au moment où la machine fait l'objet de contrôles dans des conditions de fonctionnement réelles.

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