Dismountable truss arm structure and truss-arm-type crane

Abstract

The invention relates to a dismountable truss arm structure, comprising at least two truss arm structure parts, wherein the at least two truss arm structure parts are sequentially connected along a width (B) direction of the dismountable truss arm structure in a dismountable manner. The invention also provides a truss-arm-type crane. The dismountable truss arm structure provided by the invention can be taken as an arm head of a truss arm or an arm joint in an arm body, width of the arm head or arm joint during transportation is reduced, and shipping weight is reduced, thus the problem of transhipment of the truss-arm-type crane is effectively solved, and transportation cost and time are greatly saved for a user. Meanwhile, the dismountable truss arm structure provided by the invention forms a unique connection structure, the connection structure comprises a triple load bearing structure, thus a pressure load, especially a shear load, can be effectively borne and dispersed, and the truss arm structure has obvious and excellent load carrying properties.

Description

technical field [0001] The invention relates to a crane arm, in particular to a detachable lattice arm structure. Furthermore, the invention also relates to a lattice jib crane comprising the lattice jib structure. Background technique [0002] Lattice jib crane is a kind of jib crane, which is widely used in hoisting operations in engineering construction, for example, a large number of rubber-tyred cranes, crawler cranes, tower cranes, etc. Structural design not only affects the lifting performance of these cranes, but also involves the mobility and flexibility of these cranes. [0003] As we all know, the structural parts of the crane truss jib are mainly made of angle steel, steel pipes, special-shaped steel pipes, etc., and the top of the truss jib is usually pulled by flexible wire ropes to achieve luffing. The main structural parts of the lattice boom are known to include the boom root section, the middle boom section and the boom top section, wherein the boom root ...

AI Technical Summary

Problems solved by technology

[0007] Specifically, the truss arm, especially the truss arm head, is mainly a component subject to compression, and the lifting weight of the crane is very heavy. Splitting the arm head of the truss arm in the width direction is likely to destroy the original load-bearing ring of the truss arm. Once the assembled truss arm head bears heavy compressive loads, especially when the assembled two arm heads bear the load If they are inconsistent, the connecting structure of the two arm heads needs to bear a huge shear load, which is likely to cause the two arm heads assembled together to be misaligned or even fall apart, resulting in serious engineering accidents

This kind of force situation has led to the corresponding technical prejudice among those skilled in the art, thinking that the various components of the crane lattice arm can only be assembled along the length direction, and disassembly along other directions, especially along the width direction, is not allowed. The existence of this prejudice makes it impossible for those skilled in the art to think about the possibility of other design schemes, so that as the lattice jib cranes are becoming more and more super-large, at the same time, the transportation of the lattice jib during the transition operation is becoming more and more difficult. This technical problem, which is formed on the basis of technical prejudice and lacks a scientific connection structure, has increasingly become a bottleneck restricting the development of lattice boom cranes.

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