Telescopic-boom crane and superlift device thereof

Abstract

The invention provides a superlift device for a telescopic jib. The superlift device for the telescopic jib comprises at least one rotating support, a first tightening member, a second tightening member and a third tightening member, wherein the fixed end of the rotating support is pivoted with a basic boom of the telescopic jib, and the first tightening member is arranged between the movable end of the rotating support and the outer end part of the tail boom section of the telescopic jib; the second tightening member is arranged between the movable end of the rotating support and the root of the basic boom, and one end of the third tightening member is connected with any one section closing to the tail boom section; and the other end of the third tightening member is connected onto the first tightening member. The first tightening member and the second tightening member respectively supply a first pull force and a second pull force to the tail boom section and the basic boom, and the third tightening member supplies a third pull force to an intermediate boom section, so that the magnitude of the first pull force is reduced, and the pressure generated by the first pull force and the second pull force on the telescopic jib is also reduced, and thus the deformation of the intermediate boom section of the telescopic jib is effectively inhibited.

Description

technical field [0001] The invention relates to the technical field of hoisting machinery, in particular to a super-lifting device for a telescopic boom. 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 telescopic boom cranes with long booms, is increasing day by day. [0003] In recent years, construction sites have increasingly higher requirements for the total boom length, lifting height and lifting weight of telescopic boom cranes, so commonly used telescopic boom cranes (such as wheeled telescopic boom cranes) are constantly lengthening toward the total boom length The direction of development; the boom length is an important design goal of the telescopic boom crane. [0004] The total length of the main arm of the existing large-scale tele...

AI Technical Summary

Problems solved by technology

[0012] Although the above method can play the role of resisting side bending and lifting side load to a certain extent, it is only realized by controlling the distal boom, and the middle bending of the telescopic boom cannot be effectively controlled.

[0013] In short, the existing super-lifting device improves the anti-deformation ability of the telescopic boom to a certain extent through the control of the distal boom, but it cannot fundamentally solve the problem, and cannot meet the super-lifting requirements of the long telescopic boom system, let alone Effectively control the deformation of the middle telescopic boom, while the deformation in the middle of the telescopic boom still largely affects the performance of the crane telescopic boom

That is to say, the existing super-lifting device cannot fully improve the carrying capacity of the entire telescopic boom system, and the traditional super-lifting form limits the full play of the crane performance

[0014] According to the current mainstream view, the above-mentioned large-tonnage and long-distance lifting can generally be achieved by a larger-scale crane, but the manufacturing cost of a larger-scale crane is higher, and the cost of use is also higher, and with the increase of tonnage , the assembly of the crane is becoming more and more troublesome, which in turn limits the efficiency of the assembly operation, and the reduction in the efficiency of the assembly operation further reduces the efficiency of the entire operation

[0015] Therefore, according to the existing mainstream thinking, it is difficult to make a major breakthrough in the total arm length, lifting height and lifting weight of the telescopic boom crane; in order to improve the lifting performance of the main boom, another method must be found

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