Crane super-lifting device and all-terrain crane with the crane super-lifting device

Abstract

The invention discloses a crane super-lifting device and an all-terrain crane with the crane super-lifting device. The crane super-lifting device comprises a super-lifting mast (10) and a front pulling steel wire rope (20). The all-terrain crane with the crane super-lifting device comprises a main arm (40) and an auxiliary arm (50). he super-lifting mast (10) is installed on the main arm (40). The super-lifting mast (10) is provided with a winch. One end of the front pulling steel wire rope (20) is connected to the winch. The crane super-lifting device also comprises a support assembly (60). The support assembly (60) is installed on the auxiliary arm (50). The other end of the front pulling steel wire rope (20) is connected to the support assembly (60). The other end of the front pulling steel wire rope (20) is not directly connected to the main arm (40) but is connected to the support assembly (60) so that the moment arm and the moment of a pulling force produced by the front pullingsteel wire rope (20) on the main arm (40) are increased and the stress of the main arm (40) is released, wherein the moment of the pulling force produced by the front pulling steel wire rope (20) andthe moment of a pulling force produced by a load on the main arm (40) are reversed.

Description

technical field [0001] The invention relates to a super-lifting device of a crane, in particular to a super-lifting device of a crane and an all-terrain crane including the super-lifting device. Background technique [0002] With the development of cranes towards large tonnage, the main jib of the crane usually needs to be equipped with various jibs (such as tower jibs, etc.) and superlift masts. Specifically, taking an all-terrain crane as an example, such as figure 1 As shown, the all-terrain crane comprises a main arm 40, an auxiliary arm 50, a super lifting mast 10, a front pulling wire rope 20 and a super lifting plate 30, the super lifting mast 10 is installed on the main arm 40, and the two ends of the super lifting plate 30 Be respectively connected to the super lifting mast 10 and the main arm 40, the super lifting mast 10 is equipped with a hoist (not shown), and one end of the front pulling wire rope 20 is connected to the hoist, and the other end is connected to...

AI Technical Summary

Problems solved by technology

The arm section 40a at the head is relatively the smallest in arm thickness and cross-sectional size, resulting in the smallest section flexural modulus, resulting in relatively large structural stress, which may further lead to local instability at the compressed position with a small arm thickness, so The lifting capacity of the crane may be determined by a certain dangerous section (hereinafter referred to as the dangerous section) of the head jib section 40a that may be unstable, thus limiting the improvement of the lifting capacity of the crane.

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