How to solve the failure of the slewing bearing in use

2019-08-08

The slewing bearing is a large-scale bearing with a special structure that can accept large axial loads, radial loads and overturning moments at the same time, and integrate multiple functions such as support, rotation, transmission, and fixation. The damage of the slewing bearing is relatively messy, and its damage has many forms, and the reasons are also different. In addition to bearing design and production, most of the reasons for damage are improper bearing selection, unreasonable bearing frame design, weak rigidity and poor flatness of the connecting surface, overload operation, improper installation, and poor smoothness. It is related to application factors such as lax sealing.
Analyze the failure of the slewing bearing, find out the cause of the failure, and find the solution. On the one hand, it can be considered that the bearing is correctly designed, selected and used, provided with detailed information, and then the design is improved, the bearing is selected reasonably, and the function of the bearing is fully utilized to improve economic benefits. On the other hand, it is more important to improve operational safety and avoid major accidents. Common failure causes and treatment methods of slewing bearings in use:
1. Damage caused by improper sealing
On the one hand, the seal of the slewing bearing can prevent the leakage of the smoothing agent, and on the other hand, it can also prevent the entry of water, dust, and other impurities when used in the open air. If the seal is not good, the smooth grease is not filled enough or leaks, the intrusion of moist air and water can cause the rolling body and raceway to rust and fall off; if dust and impurities enter the bearing, the rolling surface can be indented after rolling, and the bearing can be enlarged. Work surface roughness, and then shorten the bearing life;
2. Failure caused by insufficient rigidity of the support frame
The rigidity of the slewing bearing itself is not good. If the rigidity of the seat frame is insufficient, the slewing bearing will deform with the deformation of the seat frame, resulting in the unevenness of the original clearance, causing the bearing to run unsteadily during operation and produce abnormal noise. This situation has a particularly significant impact on crossed cylindrical roller bearings, forming multiple parts of the bearing without clearance, and the rollers and the rollers, and the raceways and the rollers are worn out due to mutual extrusion.
3. Failure caused by excessive flatness of the device plane
Because the slewing bearing itself has poor rigidity and weak axial bending resistance, after installation, under the effect of the bolt, the bearing will deform with the processing quality of the device plane, and the amount of deformation will increase as the flatness of the device plane decreases. . After being loaded, the warping deformation will cause partial deformation of the raceway, causing the rolling body to be stuck during rolling or the bearing makes an impact sound when it is reversed. At the same time, stress concentration occurs at the edge of the raceway, resulting in early damage to the bearing.