How can we maintain the slewing bearings?

Slewing ring is widely used. Construction machinery is the first and most widely used place of slewing ring, such as earth moving machinery, excavator, disintegrator, stacker reclaimer, grader, roller, dynamic compactor, rock drilling machinery, roadheader, etc.

• Why pay attention to the maintenance of slewing bearings?

• What causes the abnormal noise of the slewing bearing of the coal mine roadheader, and how to troubleshoot it?

• What are the effects of the structural rigidity of the turntable on the slewing bearing?

Why pay attention to the maintenance of slewing bearings?

The work that the excavator is engaged in can be described as difficult and dangerous, but many people have a misunderstanding that the excavator is invincible, so when the machine has some signs of failure, it is directly ignored in order to catch up with the project, such as excavating when lifting the boom. The machine is always 'pushing its ass'.

In fact, it is not surprising that this phenomenon is easy to be ignored, because the upper frame of the excavator will shake up and down during normal operation, but this situation is not taken seriously, and once it is serious, it will break and cause it to fail to work or even cause major accidents.

What causes the abnormal noise of the slewing bearing of the coal mine roadheader, and how to troubleshoot it?

First of all, it needs to be clear that when the slewing bearing just leaves the factory, when the slewing bearing is idling, there will be a sound of steel balls rolling evenly, which is a normal sound; if it is installed soon, it does not matter if there is a small abnormal sound, it will generally disappear after a period of rotation and running-in. Therefore, the important content mentioned today is the louder and more special sound.

What are the effects of the structural rigidity of the turntable on the slewing bearing?

The slewing bearing is an important component that transmits various loads between the turntable and the chassis. Its rigidity is not large, and it mainly depends on the structural rigidity of the chassis and the turntable supporting it. Theoretically, the ideal structure of the turntable is a cylindrical shape with high rigidity, so that the load on the turntable can be evenly distributed, but it is impossible to achieve due to the height limitation of the whole machine. The finite element analysis results of the turntable show that the deformation of the base plate connected to the turntable and the slewing bearing is larger, and it is more serious under the condition of large eccentric load, which causes the load to concentrate on a small part of the rollers, thereby increasing the load of a single roller. In particular, the deformation of the turntable structure will change the contact between the rollers and the raceway, greatly reducing the contact length and causing a significant increase in contact stress. However, the calculation methods of contact stress and static capacity that are widely used at present are based on the premise that the slewing bearing is uniformly stressed and the effective contact length of the roller is 80% of the length of the roller. Obviously, this premise is not in line with the actual situation. This is another reason why the slewing bearing is prone to damage.

That is the information about slewing bearing. If you want want get more information, please connect LYXQL slewing bearing Co., Ltd.