HYDRAULIC UNIT FOR ACTUATING QUICK GATE DESCENT WITH A SINGLE PULSE, PROVIDED WITH A LINEAR TRAVEL-MONITORING SYSTEM AND POSITION SENSORS, FOR WORK POSITION CORRECTION

摘要

The invention relates to a hydraulic unit for actuating a quick gate descent, with a single pulse, provided with a linear travel-monitoring system and position sensors for work position correction, equipped with electrically-actuated hydraulic elements, so as to provide, at a single electric pulse, without self-holding, the quick gate descent actuated by a hydraulic cylinder, used in hydroelectric power stations, in case of stopping in normal condition or in case of failure, the work travel being electronically monitored by one linear measure transducer and three position transducers, mounted in block, for monitoring settlements in the holding position, the gate up, without mechanical parts in contact. According to the invention, the hydraulic unit is an assembly consisting of a base plate (1), on which a hydraulic equipment (2) is mounted, to actuate the descent with a single electric pulse, on which three position sensors (4) are mounted, i.e. a travel end-sensor, a settlement sensor I, a settlement sensor II, activated by the magnetic field of a metallic cam (5) fixed on the servomotor (6) piston end, having mounted on the upper side of the unit a travel-monitoring transducer (3) with flexible wire, connected by means of the cam (5) to the piston of the quick gate servomotor cylinder, which electronically monitors the gate position upon descent, lift and hold position, and, in another embodiment, the hydraulic unit may be equipped with a magnetostrictive linear measure transducer, in which case the rod of the hydraulic cylinder on which it is mounted needs to be bored and a magnetic ring to be mounted on the piston to activate the transducer, where the unit may be also mounted directly onto the end flange of the servomotor, or by means of an intermediary support which facilitates the work position to the hydraulic equipment.