Crane and super-lifting device thereof

Abstract

The invention provides a crane and a super-lifting device thereof. The super-lifting device comprises a super-lifting mast, a front tensioning mechanism and a rear tensioning mechanism, wherein the super-lifting mast comprises a base, rod parts and only one power mechanism; the base is fixed on a lifting arm of the crane; one end of each rod part is hinged with the base; the power mechanism is fixed on the base, and is hinged with the rod parts; the front tensioning mechanism is connected between the super-lifting mast and the head of the lifting arm; and the rear tensioning mechanism is connected between the super-lifting mast and the tail of the lifting arm. Only one power mechanism is arranged in the super-lifting device, and can be used for driving the two rod parts to unfold simultaneously, so that the two mast rod parts can be unfolded at the same time, and unfolding angles of the two mast rod parts are consistent; therefore, steel wire ropes matched with the two mast rod parts are consistently stressed; and an effect of controlling sidewise bending is achieved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a crane super-lifting device and a crane using the same. Background technique [0002] The jib is the core component of the crane and the most important load-bearing structural part of the crane's lifting operation. The technical content of the boom structure is an important symbol of the crane product level. [0003] In order to make the crane have a larger lifting height, the jib of the large-tonnage crane is getting longer and longer, the hoisting weight is getting heavier, and the working conditions are getting worse and worse. Due to the large component force of the hoisted object perpendicular to the downward direction of the boom, the deflection of the boom on the luffing plane and the slewing plane is relatively large, and the deflection makes the stress on the boom relatively large. Poor, thus limiting the lifting capacity and carrying capacity of the crane. In ad...

AI Technical Summary

Problems solved by technology

Since the masts are respectively controlled by two oil cylinders, it is impossible to ensure that the two masts are deployed at the same time, which will lead to inconsistent deployment angles of the two masts, resulting in inconsistent forces on the wire ropes matched with the two masts, thus failing to achieve side bending control. Effect

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