PE250×400型颚式破碎机机架的模态分析

Modal analysis of frame of PE250×400 jaw crusher

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。

With the frame of PE250×400 jaw crusher serving as the study object, 3D design software SolidWorks was used to establish a 3D model of the frame, and then the model was imported into the finite element software ANSYS Workbench to calculate the fixed modes. The natural frequency and vibration shape of the frame were obtained, which laid foundations for harmonic response analysis, transient response analysis, vibration fault diagnosis and forecast as well as the optimization design of the structural dynamic characteristics. The analysis showed： the exciting frequency caused by operation of the drive motor, main shaft and conveyance belts was far lower than the frame lowest inherent frequency 175.9 Hz, which would not lead to resonance of the frame; the vibration shapes of high-order modes were complex, while the ones of low-order modes was simple, but the amplitude was wider, which had greater influence on intensity and rigidity of the frame, so it should be paid attention to avoid other vibration sources while the crusher working.