Portal crane

Abstract

The invention discloses a portal crane which comprises a crane cross beam and a hoisting beam, wherein three power hoisting points are arranged on the crane cross beam; the hoisting beam is connected with the three power hoisting points; a main hook is mounted at the lower part of the hoisting beam in a rotatable manner and is positioned in a triangular region consisting of the three power hoisting points in the horizontal direction. By adoption of the hoisting beam connected with the three power hoisting points, the hoisting beam can be safely used for joint hoisting, and the main hook can be mounted at the lower part of the hoisting beam in a rotatable manner, so that assembling is facilitated.

Description

Technical field [0001] The invention relates to a gantry crane, in particular to the structure of a gantry crane that is safely combined and hoisted and the suspended object can be rotated and adjusted. Background technique [0002] At present, in order to maximize the use of cranes, the beam 10 of the gantry crane used for the lifting of large structures such as sections in marine engineering is generally equipped with two trolleys 11 and 12 that can move along the beam. The structure is as figure 1 As shown, one of the trolleys 11 is equipped with a hook 13, and the other trolley 12 is equipped with two hooks 14, 15, and the trolley 11 equipped with a hook 13 can be used to lift goods that only require one lifting point. The trolley 12 equipped with two hooks 14, 15 can be used to lift goods that require two lifting points. Since the two trolleys 11 and 12 are installed on the gantry crane beam 10, in order to make the bending moment of the beam 10 reasonable, there should be a...

AI Technical Summary

Problems solved by technology

In many cases, it is impossible to use two trolleys 11 and 12 to lift the same cargo at the same time, so that the total lifting force of the gantry crane is split and cannot be combined effectively, resulting in a great waste of resources

For goods whose weight exceeds the maximum single trolley lifting capacity of the two trolleys 11 and 12, they can only be hoisted together with other gantry cranes, which is not only inefficient, but also causes huge waste in economy

Finally, even if other abnormal means are used to simultaneously use two trolleys 11 and 12 to jointly lift the goods, since the three points determine one side, the lifted goods cannot be rotated and adjusted during the lifting process.

When it is necessary to adjust the posture and cooperate with other corresponding products, since the lifted goods cannot be rotated and adjusted, it is difficult or even impossible to carry out the assembly process, which greatly limits the use of the gantry crane

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