摘要
超深矿井提升机卷筒在钢丝绳多层缠绕时所受钢丝绳的缠绕力错综复杂,在长期作业过程中卷筒结构可能会萌生裂纹进而发生疲劳破坏,所以有必要对卷筒结构在多层缠绕实际工作条件下的疲劳寿命展开研究。基于板壳理论,将超深矿井提升机卷筒视为均匀受压的旋转对称壳体,通过对卷筒结构负荷构成进行分析,建立了钢丝绳对卷筒作用力的数学模型,并根据提升系统动力学原理建立了钢丝绳满载上提和空载下放的动力学模型,确定了卷筒结构的动态载荷。通过对卷筒结构作业过程强度分析得出卷筒结构在整个工作循环中的应力-时间历程曲线。结合不同存活率的S-N曲线和累积损伤理论,分析了卷筒结构在不同负载下的疲劳寿命。研究结果表明:提升机满载上提和空载下放过程中卷筒结构的最大等效应力均出现在等速阶段,且其最大等效应力出现在卷筒内壁支轮与支环的中部;在给定的存活率下卷筒结构的疲劳寿命与工作负载密切相关。研究结果为多层缠绕复杂工况下卷筒的力学分析与科学设计提供了理论支撑。
The winding force of the wire rope exerting on the ultra-deep mine hoist drum is intricate in the multi-layer winding process.During the long-term operation process of the hoist drumstructure,the degradation of materials and structure damage with time will cause fatigue failureof the drum structure.Therefore,it is necessary to carry out the research of fatigue life of the hoist drum structure under the actual working conditions in the multi-layer winding process.On the basis of the theory of plates and shells,the ultra-deep mine hoist drum was regarded as the rotational symmetric shell under uniform pressure.A mathematical model was set up for the force acting on hoist drum structure.Through analyzing load composition of the drum,dynamic models were established for full load lifting and no-load descent of the steel wire rope on the basis of the dynamics principle of hoisting system,and the dynamic load of the drum structure was determined.The stress-time history curves of the drum in the whole working cycle were obtained through the strength analysis of drum structure in the working process.Based on S-N curves with different survival rates and cumulative damage theory,the fatigue life of the drum structure under different load was analyzed.The results indicated that the maximum equivalent stress both occurred in the constant speed stage on the process of full load lifting and no-load descent,and the maximum equivalent stress appeared in the middle part of supporting wheel and supporting ring of inner wall of the drum.The fatigue life of the drum structure at given survival rate was closely related to the workloads.The research provides theoretical support for mechanical analysis and the scientific design of hoist drum under complicated working conditions in the multi-layer winding process.
作者
王刚
黄灵辉
刘劲军
WANG Gang;HUANG Ling-hui;LIU Jin-jun(College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;China International Trust and Investment Corporation)Heavy Industries Co.,Ltd.,Luoyang 471039,China)
出处
《工程设计学报》
CSCD
北大核心
2018年第6期703-710,共8页
Chinese Journal of Engineering Design
基金
国家重点基础研究发展计划(973计划)资助项目(2014CB049402)
