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The structure, performance and working principle of the boom assembly

Release time:

2021/07/12

The boom assembly of a crane generally includes two parts, a main boom and a jib.

The structure, performance and working principle of the boom assembly
The boom assembly of a crane generally includes two parts, a main boom and a jib. There are two main types of crane jib assemblies, one is a truss structure jib assembly made of welded profiles and pipes, and the other is a box-shaped jib assembly with various cross-sections. With the development of truck cranes, most of the boom assemblies of cranes are now box-shaped structures, and only a few are truss structures.
The common cross-sectional shapes of the boom assembly are quadrilateral, pentagonal and hexagonal; due to the infinite functions of the boom, the quadrilateral cross-section is mainly used for some early truck-mounted crane products and truck cranes, and the introduction of the pentagonal interface board It can better solve the problem of the lower part of the boom, and has the flexibility to arrange the thickness of the loading and unloading materials flexibly and reasonably, but it also has the disadvantage of difficulty in forming the structural parts, and it is still used by most manufacturers;
In recent years, some manufacturers have begun to adopt hexagonal arm sections. The hexagonal cross-section can better solve the problem of up and down centering of the boom. The section forming process is also better. However, for the boom telescopic pulley mechanism, the very personalized forming method of the arrangement of the thickness of the material on and off brings inconvenience. The use of pentagonal and hexagonal cross-sections is currently being compared and weighed.
The function of the boom is to connect the boom at the end of the main boom when the height of the main boom cannot meet the needs, so as to achieve the purpose of lifting the object to a higher place. The boom can only lift lighter objects. The jib generally has only one jib, and there are also folding jibs or telescopic jibs with more than two sections. Among them, the folding truss structure jib is more common.
The boom assembly of a truck crane is an important part of the crane. The crane uses the pulley block on the top of the boom assembly to support the lifting wire rope to suspend heavy objects, and uses the length and inclination of the boom assembly to change the lifting height and working radius. Although the function of the boom assembly is to suspend and carry objects, different boom structures and technologies make the performance and efficiency of cranes very different.
The boom assembly is generally made of manganese steel. The manganese steel boom assembly is a high-strength boom assembly. Mainly used to withstand harsh working conditions such as impact, extrusion, and material wear. The main forms of damage are wear, partial fracture and deformation. The boom assembly is one of the main load-bearing parts of the crane. The front end bears the force of the heavy object, and the rear end bears the reaction force of the column and the luffing cylinder; the main body is composed of a multi-section sleeve telescopic arm structure, and the sections are multi-level telescopic through the telescopic cylinder or the cylinder wire rope pulley mechanism to achieve Change the working range or the height of the crane.
The working principle of the boom assembly: sequential telescopic mechanism-each section of the telescopic boom expands and contracts section by section in a certain order; synchronous telescopic mechanism-each section of the telescopic boom expands and contracts at the same relative speed; independent telescopic mechanism-each section boom can expand and contract independently Mechanism; Combination telescopic mechanism--When the telescopic arm exceeds three sections, any two telescopic methods mentioned above can be used for simultaneous expansion and contraction.

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