| 摘要 |
A marine knuckle boom crane includes a crane housing which is rotational relative to a pedestal about a vertical rotation axis and a knuckle boom assembly attached to the crane housing. The knuckle boom assembly includes a main boom, the inner end of which is connected pivotably about a first horizontal pivot axis to the crane housing; and a jib, the inner end of which is connected pivotably about a second horizontal pivot axis to the outer end of the main boom, wherein the jib is pivotable at least between an extended position in which the tip extends mainly forward from the main boom, and a folded position in which the jib is folded back, essentially parallel along the main boom. In order to position the jib with respect to the main boom, a tensioning member is provided extending between the crane housing and a curved extension guide connected to the jib. |
| 主权项 |
1. A marine knuckle boom crane comprising:
a stationary pedestal to be mounted to or formed integral with a vessel; a crane housing having an upper portion, a central portion and a lower portion, the crane housing being rotational relative to the pedestal about a vertical rotation axis; and a knuckle boom assembly attached to the crane housing, the knuckle boom assembly comprising:
a main boom comprising an inner end, a central area and an outer end, the inner end of the main boom being connected pivotably about a first horizontal pivot axis to a lower portion of the crane housing; anda jib comprising an inner end, a central area and a tip opposite the inner end of the jib, the inner end of the jib being connected pivotably about a second horizontal pivot axis to the outer end of the main boom, wherein the jib is pivotable at least between an extended position in which the tip extends mainly forward from the main boom, and a folded position in which the jib is folded back, essentially parallel along the main boom, wherein in order to position the jib with respect to the main boom, a tensioning member and a curved extension guide are provided, the tensioning member extending between the crane housing and the curved extension guide, and the curved extension guide being connected to the jib and being pivotable together with the jib about the second pivot axis, and guiding a portion of the tensioning member, wherein a second winch allows to vary the length of the tensioning member and thus to position the jib; and wherein in order to position the main boom, a luffing cable is provided, extending between the outer end of the main boom and the upper portion of the crane housing, and wherein a third winch allows to vary the length of the luffing cable and thus to position the main boom. |
