| This paper mainly aims at the problem that the main beam of 20 tons grab crane had great deflection due to bending and serious vibration in actual running in the filtration workshop of Da Gu Shan concentrating mill. We choose different work conditions, and test stress and vibration signals in each work condition. By analyzing these data and waveforms, the maximum stress and the greatest deformation positions and corresponding work conditions are found out. This is favorable to further analysis.The reasonable finite element model of the main beam is built in ANSYS which is the finite element analysis software, and the difference between the abstract model and the actual situation is furthest reduced. By calculating and analyzing rigidities and intensities of the main beam before consolidation and after Consolidation, the deformation figures, stress figures of the main beam and equivalent stress figures of beam end are gained. By comparing to and analyzing the actual testing result, it proves that this method is correct and feasible. This offers theoretical reference to the second consolidation of the main beam.In order to increase productivity, the technical reconstruction of this grab crane is needed. In this paper, two kinds of consolidation plan of the main beam are put forward. Two plans can both decrease the deformation and stress of the main beam according to the finite element simulation analysis to the main beam. This paper allows for rigidity, intensity and integrative factors, a kind of more reasonable consolidation plan is confirmed by comparing these plans. This offers valuable theoretical reference to the technical reconstruction for the main beam of this grab crane. It has attained fine result after technical reconstruction.
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