To prevent hydraulic fluid from overflowing from an oil returning device during power failure work.SOLUTION: A hydraulic elevator 1 includes: a hydraulic jack 4 lifting up and down a car 7; an oil returning device 31 driven by receiving power supply from a power storage device 34 during the power failure work to recover hydraulic fluid overflowing from the hydraulic jack 4 and return it into an oil tank 12; and a control device 21 performing the drive control of the oil returning device 31 during the power failure work. When it is detected that the power supply from commercial power supply facilities 9 is interrupted, the control device 21 drives an oil returning pump by power supply from the power storage device 34 and returns the hydraulic fluid inside a recovery tank to the oil tank 12 until the amount of the hydraulic fluid inside the recovery tank, which is detected by an oil amount detection sensor, becomes equal to or lower than a predetermined amount.SELECTED DRAWING: Figure 1
【課題】停電作業時における油戻し装置からの作動油の溢れ出しを防止する。【解決手段】油圧エレベーター1は、乗りかご7を昇降させる油圧ジャッキ4と、停電作業時に蓄電装置34からの電力供給を受けて駆動し、油圧ジャッキ4から漏れ出した作動油を回収して油タンク12に戻す油戻し装置31と、停電作業時における油戻し装置31の駆動制御を行う制御装置21と、を備える。制御装置21は、商用電源設備9からの電力の供給が遮断されたことを検知したとき、油量検出センサによって検出される回収タンク内の作動油量が所定量以下となるまで、油戻しポンプを蓄電装置34からの給電により駆動し、回収タンク内の作動油を油タンク12に戻す。【選択図】図1
HYDRAULIC ELEVATOR
油圧エレベーター
2019-09-12
Patent
Electronic Resource
Japanese
IPC: | B66B Aufzüge , ELEVATORS |
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