Cause analysis of deformation of main beam of the
2022-10-13- Detail
Analysis of the causes of the deformation of the main beam of the bridge crane
main beam deformation: under the action of load, the downward plastic deformation (calculated from the original camber) of the main beam of the bridge crane is called the downward deflection of the main beam
reasons for the downward deflection of the main beam: ① accuracy problem. The influence of the structural stress of the main beam is mainly due to the improper welding of the main beam in the manufacturing process, which causes the internal stress of the structure. When it is loaded, it is superimposed with the external stress, so that the local stress of the main beam structure exceeds the yield limit of the metal material. A. select the plastic deformation of the main fixture according to the maximum experimental force of the main machine, so as to produce permanent deformation of the whole main beam, Leading to the disappearance of the upper camber of the main beam and downward deflection; ② Long term overload use always makes the local stress of the main beam in the yield limit state, and multiple bending and stretching deformation reduces the ability of the main beam to resist deformation, resulting in deformation; After the main beam is deformed, if we do not take active and effective repair measures and continue to use it against regulations, the deformation of the main beam will gradually increase, resulting in serious downward deflection or fracture accidents of the main beam; ③ When welding the main beam, the process is improper, and the resulting thermal effect causes it to deflect downward; ④ When the crane is lifting heavy objects, due to collision, improper storage and support position, askew pulling and askew lifting and other bad mechanical and electrical operations are the soul of all components, which will cause deformation of the main beam
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