四梁六轨铸造起重机金属结构应力仿真分析

采用有限元分析方法,对四梁六轨铸造起重机桥架进行应力和变形分析,并对跨中腹板焊缝采用"板到体子模型"方法进行精细分析,得到焊缝处的应力分布状况。分析结果表明:四梁六轨铸造起重机桥架的内主梁跨中是应力和变形最大的部位,当主小车满载位于桥架跨中时,内主梁跨中腹板及加强筋板与下翼缘板连接处焊缝的最大应力均已超过了焊缝的疲劳极限应力,是桥架的危险部位,应经常检查。

Stress Simulation of Metal Structure in 4-beams-6-tracks Ladle Crane

Stress and distortion of a 4-beams-6-tracks ladle crane are analyzed with finite element method.In order to obtain the welding stress distribution of mid-span web,shell-to-solid sub-model method is introduced to get the accurate results.It is found that stress and deflection of the inside main girder reach the maximum.While the main hook is fully loaded at mid-span,the maximum stress of welding at mid-span web and the strengthening tendon-web joined with the bottom web,which is the dangerous position of the crane and should be checked frequently,has exceeded the fatigue limit.