Lift and superlift device thereof

Abstract

The invention discloses a superlift device used for a lift. The superlift device comprises a superlift mast (2), a front tensioning mechanism (1) and a rear tensioning mechanism (3), wherein the innerend of the superlift mast (2) is articulated on a rotary table (4) or on the tail part of a lifting arm (7), one end of the rear tensioning mechanism is connected to the rotary table (4), and the other end thereof is connected with the outer end of the superlift mast (2). Therefore, when the lifting arm (7) bears load, the axial force of the superlift device along the direction of the superlift mast (2) acts on the rotary table (4) or the tail end of the lifting arm (7), so that the tensile force can be conducted onto the rotary table (4) or the tail part of the lifting arm (7), thereby further improving the stress condition of the lifting arm (7), and further improving the lifting performance and the bearing capacity of the lift as well as the stability of the complete lift during operation.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a super-lifting device for a crane. The invention also relates to a 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 construction machinery, especially various cranes, is increasing. [0003] In order to make the crane have a larger lifting height, the main boom of a large crane is generally longer, and the arm length of the auxiliary boom is correspondingly longer. The component force in the direction (that is, the shear direction) is relatively large, so that the deflection of the boom on the luffing plane and the slewing plane is large, and the deflection makes the force of the boom poor, thus limiting Lifting capacity and carrying capacity of the crane. [0004] In order to solve the above problems, at present, super-lifting devices are provid...

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Problems solved by technology

[0006] However, the above-mentioned super-lifting device is arranged at the arm head of the main boom. When the super-lifting device works, a large axial force will be generated, and this force acts on the boom so that the main boom and the support The oil cylinder bears a large force, which limits the further improvement of the force condition of the boom, which in turn limits the further improvement of the crane's lifting performance and carrying capacity

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