| 摘要 |
A gravitational actuator is provided to simplify the structure of an actuator by reducing the number of shafts of the entire speed reduction unit, to be stable structurally and to have economical efficiency, to cut off a waterway safely and instantly by minimizing flood damage, to open and close a waterway safely and instantly by opening or closing a water gate with a manual handle, to prevent vertical vibration of a water gate and to make electromotive operation possible. A gravitational actuator comprises a main speed reduction unit(400) composed of a electromotor unit(410) and a cycloid speed reduction device connected to one end of an electromotor shaft of the electromotor unit and generating driving force increased in inverse proportion to the speed reduction of the rotating speed of the electromotor unit, an auxiliary speed reduction unit(500) connected to the cycloid speed reduction device to reduce the transferred driving force secondarily, a double spindle unit(600) engaged with two sides of a spindle arranged vertically to reciprocate and to open or close a heavy water gate smoothly, to generate pressure to the spindle and to restrain vertical vibration added on the spindle by the water gate, a mechanical braking unit(300) placed to a gravitational unit(250) to control the rotating speed of the gravitational unit and generating mechanical braking force if a shaft rotates fast when the water gate descends, and a manual power connection unit(350) placed between a 1-2 shaft and the other end of the electromotor shaft of the electromotor unit to restrict between the electromotor shaft and the gravitational unit. |
