The average service life of the walking wheel assembly bearing of coal mining machine in a coal mine in Shanxi is only 85 d.Theoretical calculations and statistical analyses show that insufficient lubrication of the bearing is the main reason for the short service life of the bearing,which accounts for 78.1％.For this situation put forward the use of SKF double-side sealed self-lubricating bearings to replace the previous common spherical roller bearing improvement scheme,the practical results show that after the improvement of the coal mining machine walking wheel assembly bearing service life from 85 d to 310 d,greatly reducing the labour intensity of workers,improve the efficiency of mining work,safety and economic benefits are significant.
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