Generally, main bearing operation failures mainly include the following situations: (1) The temperature of the lubricating oil gradually increases, forming streaks of Babbitt alloy on the outer surface of the hollow shaft journal. The deep streaks can reach about 2mm, and the density is uneven. The main reason is that the smoothness of the hollow shaft journal is not enough, which causes the contact point of the tile surface to be subjected to shear stress, causing large-area strain (shear damage). Babbitt alloy particles are adhered to the surface of the hollow shaft journal. When the hollow shaft rotates to the upper part, it meets the cold lubricating oil and is cold treated, thereby increasing the hardness. When it rotates downward with the hollow shaft, it strains the tile surface and causes Strip traces with unequal spacing. At the same time, after the hollow shaft with babbitt alloy particles adhered to it undergoes circulation and friction, the temperature of the main bearing lubricating oil gradually increases and generates high temperature. At this time, the bearing shell should be pulled out and the tile surface should be scraped again. If the streaks are too deep, homogeneous babbitt alloy should also be repaired and welded. (2) High temperature appears on one side of the bearing bush. This is caused by the adjustment failure of the tile seat, which causes the tile surface to contact the hollow shaft journal in a small area and the static load increases. At this time, the mill cylinder should be jacked up to check the contact between the spherical tile back and the tile seat. If necessary, the tile seat and tile back should be reground to make them self-aligning. At the same time, it is necessary to re-scrape the tile surface to completely scrape off the oxide layer, and polish the hollow shaft journal with a whetstone. (3) When the temperature rises, sometimes the main shaft has a dark luster and adhesion. This is caused by the local high temperature on the tile surface and the gluing. At this time, the bearing bush should be scraped; sometimes the main shaft is bright, which is due to the oil. It is caused by poor quality and many impurities in the oil, so the oil should be changed. (4) The oil temperature is high, but there is no babbitt adhesion phenomenon. The reasons may be as follows: first, the lubricating oil supply is small and the viscosity is low, and the oil film cannot be formed; second, the oil quality may be poor; third, the grinding pad does not meet the specification requirements, and the gap between the pad openings is too small; fourth, the bearing pad is damaged. Cooling water is not flowing smoothly. Measures such as changing the oil, re-scraping the tiles and unblocking the cooling water can be taken respectively.  

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