HIGH SPEED SHUTDOWN DEVICE FOR ELECTRIC ACTUATOR

A high speed, fail-safe device for an electric actuator that can be independently triggered in the event of an emergency shutdown is provided. An electromagnetic brake is attached to the roller nut of the screw actuator. When actuated, the brake prevents rotation of the roller nut, and therefore ena...

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Bibliographische Detailangaben
1. Verfasser:	BEEN, John J
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ACTUATING-FLOATS BLASTING COCKS DEVICES FOR VENTING OR AERATING ENGINEERING ELEMENTS AND UNITS GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MECHANICAL ENGINEERING TAPS THERMAL INSULATION IN GENERAL VALVES WEAPONS
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Beschreibung
Zusammenfassung:	A high speed, fail-safe device for an electric actuator that can be independently triggered in the event of an emergency shutdown is provided. An electromagnetic brake is attached to the roller nut of the screw actuator. When actuated, the brake prevents rotation of the roller nut, and therefore enables linear movement of the roller nut upon rotation of the lead screw to linearly move an output shaft to actuate the valve. During actuation a return spring is compressed to enable retraction of the output shaft upon system failure. During such failure, the electric break is de-energized, which allows the roller nut to rotate and linearly move under force of the return spring to retract the output shaft to its fail-safe condition. A soft-stop/over-travel system is provided to limit the impact loads on the lead screw.