US 12,220,849 B2
Method and system for operating a fluid actuator
Massimo De Nadai, San Polo di Piave (IT); Massimo Bisetto, San Polo di Piave (IT); and Massimo Rossi, San Polo di Piave (IT)
Assigned to INGLASS S.P.A., San Polo di Piave (IT)
Appl. No. 17/923,961
Filed by INGLASS S.P.A., San Polo di Piave (IT)
PCT Filed Dec. 15, 2021, PCT No. PCT/IB2021/061740
§ 371(c)(1), (2) Date Nov. 8, 2022,
PCT Pub. No. WO2022/189848, PCT Pub. Date Sep. 15, 2022.
Claims priority of application No. 102021000005306 (IT), filed on Mar. 8, 2021.
Prior Publication US 2023/0405893 A1, Dec. 21, 2023
Int. Cl. B29C 45/28 (2006.01); B29C 45/82 (2006.01)
CPC B29C 45/281 (2013.01) [B29C 45/82 (2013.01); B29C 2045/2813 (2013.01); B29C 2045/2848 (2013.01); B29C 2045/824 (2013.01)] 18 Claims
OG exemplary drawing
 
1. 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.