Method and system for operating a fluid actuator
AssigneeINGLASS S.p.A.
InventorsMassimo De Nadai, Massimo Bisetto, Massimo Rossi
Life of this patent
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Abstract
A method is described for operating an actuator adapted to move via a pressurized fluid circuit a valve pin of an injection nozzle for molten material within a mold, wherein the valve pin moves from a closing position, where no molten material passes through the nozzle, to an opening position, where molten material passes through the nozzle, and the actuator comprises a chamber and a piston that is movably mounted in the chamber, linearly displaced by the thrust of the fluid and connected to the valve pin to move it. The valve pin is moved by injecting or extracting a predetermined amount of fluid into/from the chamber.
Claims18
Method for operating an actuator via a pressurized fluid circuit to move a valve pin of an injection nozzle for molten material within a mold,
- wherein the valve pin moves from a closing position, where no molten material passes through the nozzle, to an opening position, where molten material passes through the nozzle, and vice versa,
- wherein the actuator comprises
- a chamber and
- a piston that is movably mounted in the chamber, linearly displaced by the thrust of the fluid and connected to the valve pin to move it,
- wherein at least one auxiliary tank comprising two fluid chambers separated by a movable wall is connected to the chamber of the actuator,
- a chamber of the auxiliary tank being fluidically connected to the actuator chamber, so that
- the displacement of the movable wall results in a predetermined amount of fluid being sent from the first chamber of the auxiliary tank to the chamber of the actuator, or vice versa with a reverse displacement of the movable wall, and
- the second chamber of the auxiliary tank is connectable to a pressurized fluid source to move the movable wall and bring the valve pin to the closing position,
- with the steps of
- detecting an event which is external to the two chambers of the auxiliary tank and indicative of the condition that the valve pin is traveling toward the closing position, and
- making said two chambers communicable with each other only if and when the event is detected.
System for operating an actuator via a pressurized fluid circuit to move a valve pin of an injection nozzle for molten material within a mold, the system comprising:
- an actuator comprising
- a chamber and
- a piston which is movably mounted within the chamber, linearly displaceable by the thrust of the fluid and connected to the valve pin to move it from a closing position, where there is no passage of molten material through the nozzle, to an opening position, where there is passage of molten material through the nozzle, and vice versa;
- an auxiliary tank that is connected to the chamber of the actuator and comprises two chambers for fluid separated by a movable wall,
- the first chamber of the auxiliary tank being fluidically connected with the actuator chamber, so that
- the displacement of the movable wall results in a predetermined amount of fluid being sent from the auxiliary tank chamber to the actuator chamber, or vice versa with a reverse displacement of the movable wall, and
- the second chamber of the auxiliary tank is connectable to a pressurized fluid source to displace the movable wall and thus move the valve pin toward the closing position,
- the system comprising:
- means for detecting an event external to the chambers of the auxiliary tank and indicative of the condition that the valve pin is traveling toward the closing position, and
- means for making the two chambers of the auxiliary tank communicable with each other only if and when the event is detected.
Dependencies are inferred from the claim text.