Research and analysis on the usability of slewing bearings

The slewing bearing is a large bearing that can bear large axial load, radial load and overturning moment at the same time. Turntable bearings are generally equipped with mounting holes, internal or external gears, lubricating oil holes and sealing devices, which can make the mainframe structure compact, reliable guidance, and convenient maintenance. It is widely used in large slewing devices such as lifting and transporting machinery, mining machines, construction machinery, port machinery, wind power generation, medical equipment, radar and missile launchers. Today, I will talk to you about the usability of slewing bearings.

Compared with other mechanical parts, slewing bearings have a very unique feature, that is, their life span is very discrete. Due to this characteristic of slewing bearings, there will be such a situation in actual use: some bearings have greatly exceeded their design life and can still work normally, while some bearings are far from reaching their design life. Therefore, if the bearing is regularly repaired according to the design life: on the one hand, it will cause the slewing bearing that has exceeded the design life but is still working to be removed for scrapping, resulting in waste; on the other hand, the bearing that fails to reach the design life and fails It was not discovered in time, and was dismantled and scrapped until regular maintenance. This reduced the accuracy of the machine during the period after the bearing failed and before it was scrapped, or there was a serious failure before the repair time, which caused the entire machine to be paralyzed.

Early detection and fault diagnosis of slewing bearing working status and faults have important practical significance for the safe and stable operation of equipment.

In actual research, we can make preliminary performance status judgments on some phenomena based on experience, such as checking the size and sound quality of the rolling sound of a rotating turntable bearing. Even if there is slight damage such as peeling, abnormal noise and abnormal noise will be emitted. Regular tone. Through the analysis of these sounds, it can be used as one of the basis for judging whether the bearing is running well.

In addition, the judgment of some performance conditions requires the use of related testing tools. The vibration of the slewing bearing is very sensitive to the damage of the bearing, such as peeling, indentation, rust, cracks, wear, etc., will be reflected in the vibration measurement of the slewing bearing. Therefore, the vibration can be measured by using a special slewing bearing vibration measuring device (such as a frequency analyzer, etc.). Through the analysis of the vibration frequency, further infer the abnormal situation. However, since the measured values are different due to the use conditions of the slewing bearing or the installation position of the sensor, it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.