Performance-based design: Case study of conveyor belt idlers

Autor(es): Cousseau,Tiago; Borges, Bruna K.; Pritzelwitz, Philip V.; Fonseca, Felipe R. da
Resumo: (EN) Life span of similar idlers designed for the same application varies from months to decades. The main causes of idler premature failures reported in the literature are related to rolling bearing failure due to: contamination, inadequate lubrication and misalignment. In order to understand and postpone / overcome such failures, four types of used idlers were analysed from the structural and tribological point of view. The structural analysis was performed using the finite element method (FEM) and
aimed to define bearing misalignment during operation (shaft and bearing house deflection). The tribological analysis was performed using: i) ICP - Inductively coupled plasma atomic emission spectroscopy to evaluate the amount of contaminants in the lubricating greases the rolling bearings; ii) FTIR - Fourier-transform infrared spectroscopy to evaluate grease oxidation, oil loss and water absorption; iii) rheometry to evaluate grease apparent viscosity, which was then used to predict rolling
bearing friction torque. The results showed that rolling bearing misalignment due to shaft & housing deflection along with inappropriate dimensional and geometrical tolerances of bearing housing are the main cause of idlers premature failure. Rolling bearing contamination and lubricant selection were secondary issues.
Periódico: International Conference on Bulk Materials Storage, Handling and Transportation
Ano: 2019
Volume: 13
Páginas: p. 1-10