Superlift device and crane

Abstract

The invention discloses a superlift device and further provides a crane which is provided with the superlift device. The superlift device comprises a telescopic arm, a superlift support, a first tension device, a second tension device and a third tension device, wherein a fixed end of the superlift support is connected with the telescopic arm, the first tension device is arranged between a movable end of the superlift support and the end portion of the telescopic arm, the second tension device is arranged between the movable end of the superlift device and the root portion of the telescopic arm, one end of the third tension device is connected with the telescopic arm, a connecting point of the end of the third tension device and the telescopic arm is located between the end portion of the telescopic arm and a connecting point between the telescopic arm and the fixed end of the superlift support, and the other end of the third tension device is connected with the movable end of the superlift support. By means of the technical scheme, when the crane lifts a too heavy object or an erector arm extends out too long, defects of insufficient support force and unstable erector arm caused by the fact that the telescopic arm bends to one side due to the tension which is endured by the telescopic arm can be overcome, and the lifting performance is improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, more specifically, to a super-lifting device of a crane, and a crane with the super-lifting device. Background technique [0002] With the continuous development of wind power, nuclear power and chemical industries, the hoisting industry has higher and higher requirements for the use of all-terrain cranes, and the required tonnage is also increasing. [0003] At present, large-tonnage all-terrain cranes are designed with super-lifting devices in order to improve the stability of the boom of the whole machine. The super-lifting device is a traction system added to improve the stress state of the telescopic arm, and its existence can greatly improve the lifting capacity of the telescopic arm. With the increase of lifting capacity and working height, the quality and length of the telescopic boom of the crane are getting larger and longer. When working in medium and long ranges, the deformation...

AI Technical Summary

Problems solved by technology

As a result, when the crane is hoisted and the telescopic arm 10 stretches out to a certain length, although the above-mentioned super-lifting device is installed, the telescopic arm 10 still has a certain degree of deflection, and as the weight of the hanging object increases and the extension of the telescopic arm growth, the more severe the deflection, and even affect the lifting stability and safety of telescopic booms and cranes

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