Telescopic crane and superlift device thereof

Abstract

The invention discloses a superlift device, which is used for a telescopic crane, and comprises at least one rotary support, a derricking oil cylinder, a first tension device, and a second tension device, wherein a fixed end of the rotary support is pivoted with a basic boom of the telescopic crane; the derricking oil cylinder is arranged between the rotary support and the basic boom; the first tension device is arranged between a movable end of the rotary support and the outer end of any telescopic boom of the telescopic crane; and the second tension device is arranged between the movable end of the rotary support and the root of the basic boom. The first tension device applies a first tension force between the telescopic boom and the movable end of the rotary support, and the component force of the first tension force can balance the partial component force of a heavy object in a sheared direction of a main boom, so the stress state of the main boom is obviously improved, the deflection of the main boom is remarkably reduced under equal loading conditions, and performances of the telescopic crane such as total boom length, lifting height and lifting weight are remarkably promoted.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a super-lifting device for a telescopic boom crane. In addition, the present invention also relates to a telescopic boom crane comprising the above-mentioned super-lifting device. Background technique [0002] With the rapid development of my country's economic construction, the market demand for telescopic boom cranes, especially large-tonnage telescopic boom cranes, is increasing day by day. [0003] In recent years, construction sites have increasingly higher requirements for the total arm length, lifting height and lifting weight of telescopic boom cranes, so commonly used telescopic boom cranes (such as wheeled telescopic boom cranes) are developing in the direction of large-scale ;Massification is an important design goal of the telescopic boom crane. [0004] The total length of the main arm of the existing large-scale telescopic boom crane is longer (usual...

AI Technical Summary

Problems solved by technology

The use of high-strength plates will improve the lifting performance of the main boom to a certain extent; however, although the allowable stress of high-strength plates is relatively high, their ability to resist local instability has not been significantly improved, which restricts the lifting performance of the boom. Further improvements in heavy performance

In addition, restricted by the development speed of science and technology, the speed of increasing the strength of the plate is slow, and it is difficult to quickly meet the requirements

[0008]Therefore, according to the existing mainstream ideas, it is difficult to make a major breakthrough in the total arm length, lifting height and lifting weight of the retractable boom crane; The lifting performance of the jib had to find another way

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