门座式起重机臂架折断故障树分析与对策

针对门座式起重机折臂事故时有发生的问题,以门机折臂事故为顶事件建立故障树,并对其进行定性分析和定量分析,得到故障树各底事件的结构重要度、概率重要度,最后计算出各底事件的临界重要度.结果显示门机臂架折断的主要风险源为焊缝开裂、长期交变载荷以及设计制造缺陷等,提出严禁超载、定期检验以及严格按照设计要求制造等预防门座式起重机臂架折断故障的对策.

Fault tree analysis and countermeasures of gantry crane arm fold accident

To prevent the accidents of gantry crane arm folding occurring frequently,gantry crane arm fold was used as the top event to set up a fault tree.By qualitative analysis and quantitative analysis,the structure importance and probability importance of the bottom event were obtained,and the critical importance was calculated.The results show that the risk sources of the trouble are weld failure,long-term cyclic load and design flaw etc.We put forward countermeasures of non-overloading,periodic inspection and strictly according to the design requirements for manufacturing.