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以PE250×400型颚式破碎机机架为研究对象,利用三维设计软件SolidWorks对机架进行了三维实体建模,然后导入到有限元软件ANSYS Workbench中对其进行了固定模态计算,得到了机架的固有频率和振型,为后续进行的谐响应分析、瞬态响应分析、振动故障诊断和预报,以及结构动力特性的优化设计奠定了基础。通过分析表明,由驱动电动机、主轴和皮带传动引起的激励频率远远低于机架的最低固有频率175.9Hz,因而不会导致机架共振的产生;机架高阶振型的振动形式较复杂,机架低阶振型的振动形式简单,但振幅较大,对机架的强度和刚度影响较大,工作时应注意使破碎机周围的振源频率与之避开。
Taking PE250 × 400 jaw crusher frame as the research object, a three-dimensional solid modeling of the frame was carried out by using SolidWorks three-dimensional design software and then imported into the finite element software ANSYS Workbench to calculate the fixed modal. The natural frequencies and mode shapes of the racks lay the foundation for the subsequent harmonic response analysis, transient response analysis, vibration fault diagnosis and prediction, as well as the optimal design of structural dynamic characteristics. The analysis shows that the excitation frequency caused by the drive motor, spindle and belt drive is much lower than the minimum natural frequency of 175.9Hz, so it will not cause rack resonance. The high-order vibration mode of rack is more complicated, Low-order vibration mode vibration form is simple, but the larger amplitude, the strength and stiffness of the larger impact on the work should be taken to make the vibration frequency around the crusher and avoid it.