冶金起重机主梁性能退化研究及加固设计

Research and Design on Performance Degradation and Reinforcement of Main Beams of Metallurgical Cranes

冶金起重机作为冶炼、浇筑车间熔融金属的关键搬运设备,使用中启停频繁,主要承载结构常满载吊运铁水,且承受间断性的高温辐射,容易发生疲劳失效现象,威胁人身、财产安全,因此有必要对其主梁进行加固研究。通过建立缩尺模型准确分析主梁力学性能,总结其失效退化模式,提出采用粘贴CFRP布方式对缩尺模型进行加固,并进行试验测试。结果表明,经加固设计的主梁结构刚度提升了17.4%,挠度变形减小了16.7%,该加固方案具有良好的应用价值。

Metallurgical cranes,as key handling equipment for molten metal in smelting and pouring workshops,are frequently started and stopped during use.Their main load-bearing structure is often fully loaded to lift molten iron,and they withstand intermittent high temperature radiation,which is prone to fatigue failure and poses a threat to personal and property safety.Therefore,it is necessary to conduct reinforcement research on their main beams.By establishing a scaled model to accurately analyze the mechanical properties of the main beam,summarizing its failure degradation modes,it is proposed to reinforce the scaled model by pasting CFRP cloth,and conduct experimental testing.The results show stiffness of the main beam structure after reinforcement design has been increased by 17.4%,and the deflection deformation has been reduced by 16.7%,indicating that the reinforcement scheme has good application value.