| 摘要 |
The foregoing invention concerns a rotary crane, especially an offshore crane of the king post type. The rotary crane has a pylon that can be permanently anchored on a floor plate, platform, or similar equipment, a turntable mounted to revolve on the longitudinal axis of the pylon, and rotating gear for rotating the turntable on the pylon, the rotating gear having a ring gear positioned on the pylon and a pinion drive that is connected with the turntable and meshes with the ring gear. According to the invention, the pinion drive is mounted on the turntable so that it can move radially relative to the ring gear, and is linked with the ring gear by means of coupling equipment. Tipping movements of the turntable relative to the pylon as a consequence of support clearance can thereby be equalized, and damage to the rotating gear can be prevented. Preferably the ring gear is multi-sectional and consists of several toothed segments attached to the pylon in such manner that they can be detached.
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