Jib structure, jib system and crane

Abstract

The invention relates to a jib structure, a jib system and a crane. The jib structure comprises a jib body which comprises a plurality of side surfaces and two end surfaces, wherein all the side surfaces are welded by a plurality of cross bars, and a roller device is arranged on the cross bar in one side surface. According to the jib structure, the roller device is arranged on the jib body, the jib structure with the small cross section is nested into the jib structure with the large cross section by the roller device, the jib sections with the different cross sections can be nested and assembled, and the quantity of vehicles for transporting the jib structure can be reduced.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a boom structure, a boom system and a crane. Background technique [0002] With the acceleration of my country's urbanization process and rapid economic development, the scale of national infrastructure is getting larger and larger, and the quality, volume and lifting height of objects that need to be hoisted are getting larger and larger. Crawler cranes are increasingly showing their Superiority, crawler cranes have been developed rapidly. The jib system is the key operating part of the crawler crane. The jib lifts the heavy objects to a certain height and range to realize the displacement of the heavy objects. With the increase of domestic petroleum, petrochemical, nuclear power, wind power, steel and other large-scale engineering projects, my country's demand for super-large equipment hoisting is growing rapidly, crawler cranes are also constantly developing in the directi...

AI Technical Summary

Problems solved by technology

Depend on image 3 From the top view of the boom structure, it can be seen that the upper and lower surfaces of the boom structure are arranged with different numbers of horizontal and vertical crossbars. During the nesting and assembly process of the boom, when the Figure 4 In the position shown, due to the interference of the crossbar on the upper surface of the boom, the nesting process cannot continue. At this time, only the Figure 4 Remove the hanging point, select another lifting point or use other auxiliary means for nesting assembly, the nesting assembly efficiency is low, and during the replacement of the hanging point or the embedding process, due to the lack of effective fixation, protection and other means, the inner and outer booms It is very prone to dangers such as collision and friction, which will reduce the service life of the boom; in order to reduce the replacement of lifting points and improve the efficiency of nesting and assembly, it is hoped that the single insertion amount will be as large as possible. Figure 4 It can be seen that the cross-sections of the inner and outer booms are not much different, and the internal space is very limited. The danger brought by a large amount of single embedding is that the boom is more prone to collisions, friction and other dangers.

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