Abstract：A three-dimensional model of a PCF1420 hammer crusher rotor system is built with SolidWorks software, and its first 20 order frequencies and vibration modes are comparatively analyzed by finite element modal simulation.We learn that the hammer and pin have a significant impact on rotor natural frequency and vibration mode.The natural frequency of a wear transformed rotor is also analyzed.The results show that the natural frequency changes little after an improvement, and that the improvement can be performed.The computational analysis result provides a reference frame for the structure improvements and optimization design of a crusher rotor.

Keyword：crusher;rotor;modal analysis;