| 摘要 |
<p>A twin-type slewing crane comprising an upright foundation with a ring gear secured thereon and having a generally vertical axis. A generally horizontal base plate is mounted on the foundation. Two individual cranes, each having a luffing jib with means including a hoisting rope running from a winch of that crane to a jib thereof for raising and lowering the jib, are also provided. A support is provided for each crane, each mounting a respective crane for rotation about the central axis at the same distance from the central axis as one another. A rotating mechanism is provided for each crane and projects therefrom into meshing relationship with the ring gear, whereby operation of the rotating mechanism of at least one of the cranes propels at least that respective crane about the said central axis. A central axle is coaxially disposed on the central axis and extends upwards from the base plate. Also provided are two axially intercalated sets of two axially spaced bearings. Each bearing has an inner race mounted on the axle and one set has an outer race of each bearing thereof mounted on the support of one of the cranes and the other set has an outer race of each bearing thereof mounted on the support of the other of the cranes. An anti-tipping roller is provided between the supporting means of each of the cranes and the base plate.</p> |
