曲轴连杆式大型弛张筛关键部件动态特性  

Vibration characteristics of key components of large crank connecting rod type flip-flow screen

作　　者：赵光辉 施长玉 李志军 王维楠 段晨龙[2] ZHAO Guanghui;SHI Changyu;LI Zhijun;WANG Weinan;DUAN Chenlong(GuonengZhunneng Group Co.,Ltd.,Ordos Inner Mongolia 010300,China;China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]国家能源集团准格尔能源有限责任公司,内蒙古自治区鄂尔多斯010300 [2]中国矿业大学,江苏徐州221116

出　　处：《洁净煤技术》2024年第S01期672-677,共6页Clean Coal Technology

基　　金：国家杰出青年科学基金资助项目(52125403);国能准能集团科技创新资助项目(ZNKJ-22-24)

摘　　要：弛张筛作为选煤厂原煤干法深度筛分的关键装备,尤其曲轴连杆式弛张筛稳定性较好,在大型动力煤选煤厂得到广泛应用。曲轴连杆机构为该大型弛张筛的核心关键部件,其可靠性对筛分效果与后续分选环节均有重要影响。基于此,采用有限元仿真计算,聚焦曲轴连杆机构的动态特性,围绕哈尔乌素大型动力煤选煤厂大型弛张筛,构建曲轴连杆结构有限元模型并进行模态分析,进而基于模态叠加法进行简谐载荷作用下的谐响应分析,最后通过边界条件模拟其在筛机运行下的运动状态,对其进行了动力学分析。结果表明,其固有频率均远大于系统工作时的激振频率,曲轴连杆结构无共振风险;工作状态下曲轴连杆产生的应力集中在曲轴表面以及连杆的轴承处,最大应变为1.10×10^(-4),满足设计要求;同时,确定了连杆与曲轴间的机械碰撞是结构产生材料变形的主要原因。本研究结果为大型曲轴连杆式弛张筛的选型设计、结构优化以及工程实践提供了理论与技术参考。As a key equipment for deep dry coal screening in coal preparation plants,the flip-flow screen,especially the crankshaft connecting rod type,has good stability and is widely used in large power coal preparation plants.The crankshaft connecting rod mechanism is the core and key component of the large flip-flow screen,and its reliability has a significant impact on the screening effect and subsequent sorting processes.Therefore,this study adopted finite element simulation calculation,focusing on the dynamic characteristics of the crankshaft connecting rod mechanism.Based on the LF301008 large-scale flip-flow screen,a finite element model of the crankshaft connecting rod structure was constructed and modal analysis was conducted.Then,the harmonic response analysis under simple harmonic load was carried out using the modal superposition method.Finally,the motion state of the screen machine was simulated through boundary conditions and dynamic analysis was conducted.The results indicate that their natural frequencies are higher than the excitation frequency during system operation,and there is no risk of resonance in the crankshaft connecting rod structure.The stress generates by the crankshaft connecting rod under working conditions is concentrated on the surface of the crankshaft and the bearings of the connecting rod,with a maximum strain of 1.10×10^(-4),which meet the design requirements.At the same time,it is determined that the mechanical collision between the connecting rod and the crankshaft is the main cause of material deformation in the structure.The results of this study provide a theoretical and technical reference for the selection,design,structural optimization and engineering practice of large-scale crankshaft connecting rod type flip-flow screens.

关 键 词：原煤筛分 大型弛张筛 曲轴连杆 动态特性 有限元方法 

分 类 号：TD94[矿业工程—选矿] TD452