UNDERWATER LIFTING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an underwater lifting device capable of performing maintenance of a sonar during underwater levitation of a main ship.SOLUTION: An underwater lifting device 100 capable of lifting up and down a sonar 2 from a bottom of a ship 3, comprises: a storage box 10 capable of storing the sonar 2 and disposed so as to be opened to the bottom; a lifting rod 20 for lifting the sonar 2 to be coupled to a lower end between a storage position where the sonar 2 is stored in the storage box 10 and a work position where the sonar 2 is protruding in water from the bottom of ship; and a shut-off valve 30 interposed between the storage box 10 and the bottom of the ship 3, and capable of shutting off communication between the storage box 10 and water. The storage box 10 comprises: a drain passage 13 capable of draining water in the storage box 10 when the shut-off valve 30 shuts off communication between the storage box 10 and water; and a lid body 12 disposed on an opening 11 disposed on a side surface of the storage box 10 and capable of being detached.