Foldable device capable of preventing suspension arm from tilting backwards for large luffing crane

Abstract

The invention discloses a foldable device capable of preventing a suspension arm from tilting backwards for a large luffing crane, belonging to the field of cranes. The foldable device comprises a main supporting rod, a rear supporting rod, a hydraulic oil cylinder and relevant hinge pins, wherein one ends of the main supporting rod and the rear supporting rod are hinged with a hinged support of an A-frame respectively through the hinge pins; the other end of the rear supporting rod is connected to a guide groove of the main supporting rod through the hinge pin; connecting lug plates for rod bodies of the main supporting rod and the rear supporting rod are movably connected through the hinge pins; the hydraulic oil cylinder is hinged with the hinged support of the A-frame through the hinge pin; the telescopic rod end of the hydraulic oil cylinder is hinged with a hinged support in the middle of the rear supporting rod through the hinge pin; a suspension arm support is arranged at the front end of the main supporting rod. According to the invention, power is supplied by the hydraulic oil cylinder, the rear supporting rod is controlled by the telescopic motion of the hydraulic oil cylinder to rotate around the hinge pin, the hinge pin of the rear supporting rod can move in the guide groove in the main supporting rod, and accordingly, the main supporting rod is controlled to rotate around the hinge pin at one end, so that the folding function of the device is realized; the foldable device is simple and smart in structure, and simple and safe to operate, and is capable of remarkably improving the operational capability of the luffing crane.

Description

technical field [0001] The invention relates to a foldable boom anti-tilt device for a large luffing crane, which belongs to the field of cranes. Background technique [0002] With the continuous development of various engineering constructions, the requirements for various engineering equipment are getting higher and higher, and the continuous application of new technologies has improved the working ability and work efficiency of engineering equipment. Luffing cranes are more and more used in engineering construction. They have the characteristics of strong lifting capacity, large operating range, and low manufacturing cost. However, due to their strong lifting capacity and large operating range, this type of crane requires boom The structure is very strong, which results in the heavy weight of the boom structure. If the boom tilts backward during work and loses control, it will cause serious safety accidents. Therefore, when the crane is working, the anti-tilt boom device ...

AI Technical Summary

Problems solved by technology

Luffing cranes are more and more used in engineering construction. They have the characteristics of strong lifting capacity, large operating range, and low manufacturing cost. However, due to their strong lifting capacity and large operating range, this type of crane requires boom The structure is very strong, which results in the heavy weight of the boom structure. If the boom tilts backward during work and loses control, it will cause serious safety accidents. Therefore, when the crane is working, the anti-tilt boom device is very important. important

The anti-backward device in the prior art can meet the working requirements under general working conditions, but when the crane needs to pass a bridge with limited height requirements, after the boom and the gable are lowered, the lowering height of the anti-backward device will be One of the important problems to be solved is that the existing anti-bending arm back tilting device cannot meet the requirements due to its fixed structure characteristics, and it is necessary to develop a movable anti-hanging jib back tilting device that can reduce the height to meet the needs of the crane's navigable height limit

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