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为研究大型高频振动筛动态特性及内部应力分布特点,采用与实际工况相似原则,分析建模中关键技术问题,提出一种以简化和实体相结合的有限元模型。经过结构动态有限元分析,结果表明:该大型高频振动筛工作频率(24Hz)在其第6和7阶固有频率之间,且远离其数值,避免工作过程中共振现象的发生;工作过程中各项最大动力响应值远低于许用最大值,筛机结构可靠。最后分析了大型高频振动筛侧板、内外加强板、横梁、加强梁、出入料端梁、橡胶弹簧、支撑头等的Von Mises应力分布特点。研究结果可作为今后高频振动筛动态强度校核和结构改进的依据,也可为其他相似类型的振动设备的结构设计及其结构分析提供参考。
In order to study the dynamic characteristics and internal stress distribution characteristics of large-scale high-frequency vibrating screen, the principle of similarity with actual working conditions is adopted to analyze the key technical problems in modeling and a finite element model combining simplification with solid is proposed. After the dynamic finite element analysis of the structure, the results show that the operating frequency (24Hz) of the large-scale high-frequency vibrating screen is between its 6th and 7th natural frequencies and far away from its value, so as to avoid the resonance phenomenon during the working process. The maximum dynamic response is far below the maximum allowable value, the sieve machine structure is reliable. Finally, the Von Mises stress distribution characteristics of the large-scale high-frequency vibrating screen, the internal and external stiffeners, crossbeams, reinforcing beams, entrance and exit end beams, rubber springs and supporting heads are analyzed. The results can be used as the basis for the dynamic strength check and structural improvement of high-frequency shale shakers in the future, as well as for structural design and structural analysis of other similar types of vibration equipment.