Research on Vibration Characteristic of Flotation Machine Lower Shaft

摘要

According to the lower shaft structure feature of a pneumatic and mechanical agitation flotation machine in the practical application, a finite element model is established on the basis of modality analytical theory of vibration structure. Through analyzing the modality characteristics of the lower shaft, the vibration mode of lower shaft is obtained. Moreover, through analyzing the modal characteristics of the lower shaft in condition of different impellers material and lower hollow shaft wall thickness, the conclusion is obtained that more lighter the impeller' material is, more great the difference between natural frequencies and vibration excitation frequencies is. Another conclusion is that the lower shaft still do not resonate when the wall thickness of lower shaft thin appropriately. The conclusions of this paper have great theoretical and practical significance of further optimization of the flotation machine lower shaft structure.