A crane and a boom thereof

Abstract

The invention discloses a crane and a boom thereof. The boom comprises a basic boom; at least one level of a telescopic boom group sleeved in the basic arm in sequence, wherein the telescopic group includes a first telescopic boom and a second telescopic boom sleeved in the first telescopic boom, and the end of the first telescopic boom in the telescopic boom group is provided with a first locking pin hole; at least one rope unwinding mechanism, wherein the rope unwinding mechanism is arranged between the second telescopic boom and the first telescopic boom of all the telescopic groups; and a telescopic cylinder arranged in the boom in an axial direction, wherein the piston rod end of the telescopic cylinder is fixedly connected to the end of the basic boom, and a locking pin cooperated with the first locking pin hole is arranged on the outer wall of the telescopic cylinder. According to the present invention, only one boom is driven out by the rope unwinding mechanism, thus greatly reducing the impact of rope elasticity to the telescopic mechanism, and effectively solving the boom stretching vibration problem due to a plurality of groups of rope unwinding mechanisms.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a crane and its boom. Background technique [0002] At present, the telescoping mechanism of the boom is generally powered by the telescoping of the oil cylinder, and is generally divided into a cylinder rope mechanism and an oil cylinder latch mechanism according to the difference of the driving mechanism. [0003] Among them, the oil cylinder rope row mechanism is divided into a single-cylinder rope row and a double-cylinder rope row structure; specifically, the oil cylinder pushes one section of the arm to extend, and the first section of the arm drives the second section of the arm to extend through the rope row mechanism, and the second section of the arm is extended through the rope. The row structure drives the extension of the three-section boom, and so on, and each section boom is extended synchronously; because the rope row structure occupies a certain space, the s...

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Problems solved by technology

[0003] Among them, the oil cylinder rope row mechanism is divided into a single-cylinder rope row and a double-cylinder rope row structure; specifically, the oil cylinder pushes one section of the arm to extend, and the first section of the arm drives the second section of the arm to extend through the rope row mechanism, and the second section of the arm is extended through the rope. The row structure drives the extension of the three-section boom, and so on, and each section boom is extended synchronously; because the rope row structure occupies a certain space, the section of the boom is limited, so that the lifting performance of the boom cannot be fully exerted; at the same time, the rope row structure It has a certain influence on the problems of jib shake and hoisting retraction

When the oil cylinder is telescopic, it can only control the extension of one section of the boom at a time, and the telescopic efficiency of the boom is low

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