Slewing bearing failure and solutions
Slewing bearing failure and solutions
Slewing bearing is a kind of large bearing with special structure that can bear large axial load, radial load and overturning moment and other comprehensive loads at the same time. Slewing bearing is a large bearing that can withstand comprehensive loads. The slewing bearing itself has the characteristics of compact structure, convenient guiding and rotation, simple installation and easy maintenance, etc. It is widely used in large-scale slewing devices such as lifting and transportation machinery, mining machinery, construction machinery, port machinery and launchers. Today, the editor of Luoyang Heng Guan Bearing Technology will talk to you about the failure of slewing bearings and their solutions.
First, Common failure of slewing bearing
1. Inflexible rotation
When the bearing is in use, the rotation may be inflexible. This phenomenon is caused by many reasons, generally because the grease in the raceway of the bearing is viscous, or the host mounting surface and the slewing bearing are not fit during installation. Poor surface fit, lack of grease, damage to the sealing strip, etc. will cause the bearing to rotate inflexibly.
2. Abnormal noise
It is normal if the slewing bearing that has just left the factory makes a uniform sound of steel ball rolling when it is idling. However, if the slewing bearing is accompanied by another abnormal and loud noise during operation after installation, pay attention to it! Generally, the abnormal noise may be caused by the slight deformation of the slewing bearing, or the installation surface does not meet the installation requirements, etc.
3. There is shaking
Shaking will also affect normal use, so you should also pay attention to shaking. Generally, shaking is caused by loose mounting bolts, insufficient rigidity of the steel structure supporting the slewing bearing, or overloaded operation.
4. Broken teeth
If there is a broken tooth, it is more serious. It may be due to quality reasons, or it may be caused by improper installation. In addition, the backlash of the large and small gears is improperly adjusted during installation, which does not meet the requirements, and the axes of the large and small gears are not parallel.
Second, the solution to the failure of the slewing bearing
1. If the rotation is inflexible, the production date of the slewing bearing can be checked. If the time is long (such as more than half a year) and the climate is cold, the grease in the raceway may be viscous for a long time, resulting in poor operation. Next, we will try to run it after afterburning. If it can run normally, it can be used normally. If it is accompanied by abnormal noise, it is necessary to check whether there is any serious injury during transportation and consult with the after-sales service.
2. If the operation is not flexible after installation, it may be because the installation surface of the main engine and the installation surface of the slewing bearing do not cooperate well. At this time, the installation plane of the main engine should be reprocessed to make the installation plane meet the requirements, or the gasket filling method should be used to deal with it. In addition, you can re-adjust the meshing backlash of the large and small gears as required, especially pay attention to the position of the gear jumping, and check to ensure that there is no foreign matter at the meshing position of the large and small gears.
3. If the operation is not flexible during use, it is necessary to add grease appropriately, fill it up as required, and check whether there is foreign matter entering the raceway. In addition, check the meshing condition of the large and small gears, whether there is foreign matter or broken teeth.
4. In the case of abnormal noise, check whether the installation surface is flat and meet the requirements. In addition, when there is abnormal noise, the rotation of the slewing bearing can be stopped to determine whether there is a lack of grease in the raceway, or whether the noise is caused by the collision between the rolling element and the spacer. , this kind of noise can be eliminated after filling in oil in time. In addition, attention should also be paid to whether the sealing strip is damaged, the mounting bolts are loose, resulting in the elastic deformation of the slewing bearing, and the negative clearance at the deformed position.
5. When there is shaking, check all the inner and outer ring mounting bolts in time and tighten them as required. Or increase the strength of the steel structure supporting the slewing bearing, check whether it is overloaded, and operate in strict accordance with the regulations.
6. The broken teeth must meet the installation requirements first, then adjust the side clearance, adjust the meshing clearance, and conduct a trial run after the adjustment. Also, make sure that the axes of the two gears are parallel. and tighten the bolts. When operating, be careful not to operate illegally, and ensure that the large and small gears are clean and checked frequently.
