Crane and super-lifting device thereof

Abstract

Disclosed is a crane and a lifting extension apparatus thereof, characterized by comprising a lifting extension derrick (1), a forward tensioning mechanism (3), and a rear tensioning mechanism (5), wherein the lifting extension derrick (1) comprises a base (11), a mast (12), a jib luffing oil cylinder (15) and a power mechanism. The base (11) is fixed onto the boom (9) of the crane; one end of the mast (12) is hinged to the base (11); the two ends of the jib luffing oil cylinder (15) are respectively hinged to the crane boom (9) and the base (11); there is only one power mechanism; the power mechanism is fixed onto the base (11) and is hinged to the mast (12); the forward tensioning mechanism (3) is connected between the lifting extension derrick (1) and the tip of the crane boom (9); and the rear tensioning mechanism (5) is connected between the lifting extension derrick (1) and the tail end of the crane boom (9). The lifting extension apparatus is only provided with one power mechanism. The power mechanism can simultaneously drive the expansion of two masts and therefore, the simultaneous expansion of two derricks can be guaranteed, making the angle of the expansion of the two derricks consistent, thereby enabling steel cable cooperating with the two derricks to be subject to the same force and thus achieving the effect of side sway control.

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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