Telescopic arm crane, lifting device and rope pulling and tensioning device thereof

Abstract

The invention discloses a rope pulling and tensioning device, comprising a tensioning hoisting and a tensioning cylinder; the outside of the tensioning hoisting is wound with a pulling rope, and a winding drum thereof is fixedly connected with a ratchet wheel coaxially; the tensioning cylinder can drive the ratchet of the ratchet wheel so as to further tense the pulling rope; the rope pulling andtensioning device further comprises a circumferential location device which prevents a cylinder lever and a cylinder barrel of the tensioning cylinder from generating relative rotation. The inventionalso provides a lifting device of the rope pulling and tensioning device and a telescopic arm crane. The circumferential location device is arranged between the cylinder lever and the cylinder barrelof the tensioning cylinder, which can prevent the cylinder lever generating rotation relative to the cylinder barrel; the driving piece of the tail end of the tensioning cylinder can accurately be clamped into the ratchet wheel outside the tensioning hoist after the tensioning cylinder extends. The technical scheme provided by the invention is simple, has lower cost and more convenient overhaul operation, and is also convenient for improvement of the current lifting device simultaneously.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a stay rope tightening device used for a super-lifting device of a telescopic boom crane. The present invention also relates to a super-lifting device and a telescopic boom crane comprising the above-mentioned stay rope take-up device. Background technique [0002] With the rapid development of my country's economic construction, the market demand for telescopic boom cranes, especially large-tonnage telescopic boom cranes, is increasing, and the construction site has more and more requirements for the total arm length, lifting height and lifting weight of telescopic boom cranes. High, so commonly used telescopic boom cranes (such as wheeled telescopic boom cranes) are developing in the direction of large-scale; large-scale is an important design goal of telescopic boom cranes. [0003] At present, the design ideas such as optimizing the cross-section of the main boo...

AI Technical Summary

Problems solved by technology

However, in the actual operation process, the cylinder rod of the tightening oil cylinder may rotate in the cylinder barrel, so that the transmission member at the end of the cylinder rod will deviate from the predetermined position and no longer maintain the rotating shaft of the tightening winch. Roughly parallel, this will obviously cause the transmission part to be unable to be accurately and simultaneously snapped into the ratchets on both sides of the winch after the cylinder rod is extended, and the tightening cylinder will not work properly

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