Telescopic boom of marine crane

Abstract

The invention discloses a telescopic boom of a marine crane, which comprises a base boom, an oil cylinder telescopic boom and a steel wire rope telescopic boom, wherein a boom pulley is fixed on a head of an oil cylinder through a boom pulley shaft; two sides of the boom pulley shaft are fixed with rollers; a guide rail is fixedly connected in a boom rack; the rollers are pressed on the guide rail; two ends of the boom pulley shaft are fixed with lateral cushion blocks; a guide location device composed of rollers, the guide rail and the lateral cushion blocks can effectively support the head of the oil cylinder; when sea waves roll to produce larger load, the device can effectively limit vertical and horizontal displacements of the oil cylinder and prevent the friction between the oil cylinder and inner wall of the boom rack to influence normal flexibility of the boom rack, as well as protect structures of the oil cylinder and the boom rack from being destroyed; the guide location device is particularly suitable for the telescopic boom of the marine crane.

Description

technical field [0001] The invention relates to a telescopic arm of a crane, in particular to a telescopic arm used for a marine crane, and belongs to the technical field of cranes. This technology is a patented technology of the project funded by the National High-tech Research and Development Program (863 Program). Background technique [0002] Offshore cranes generally adopt a multi-section telescopic boom structure to save the space occupied by the crane on the deck, and at the same time meet the requirements of the crane's operating range. At the same time, the offshore crane is limited by the conditions of use of the ship, requiring the jib to have a smaller jib section size to reduce its own weight, and for the situation that the ship is subject to waves and the crane is susceptible to greater lateral loads, it is required that the offshore crane, especially the jib The frame has higher rigidity and stability, which puts forward higher requirements on the structure o...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that in the telescopic arm of the existing marine crane, the outrigger pulley is fixed on the head of the oil cylinder so that the head of the oil cylinder is a cantilever structure. Defects and deficiencies such as large deformation, affecting the normal expansion and contraction of the boom frame, and easy damage to the boom frame structure, provide a telescopic boom of a marine crane. The cantilever structure becomes a beam structure with two-point support, which can effectively support and fix the head of the oil cylinder, avoid excessive deformation and displacement of the oil cylinder and affect the normal expansion and contraction of the arm frame, and protect the arm frame structure from damage due to friction during expansion and contraction

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