We all know that slewing bearings are commonly used bearings in many large mechanical equipment. After long-term use, different noises will appear, such as dust and scars. What methods should be used to solve these noises? In response to such problems, the editor will tell you the countermeasures and solutions for common slewing bearing noise.
1. The sound of dust
There are foreign objects such as dust in the slewing ring, and non-periodic vibration will occur. The so-called dust sound. The magnitude of vibration and noise is uncertain, and there may or may not be.
Countermeasures: Improve the cleaning method of slewing ring/turntable bearings, strictly clean the bearings, shafts, seat holes and matching parts before installation; remove foreign objects in the lubricant; improve the sealing of the bearings; avoid using impure or embedded materials Plastic cage for foreign objects.
2. The sound of scars
If the rolling surface of the slewing bearing has cracks, indentations or corrosion, periodic vibration and noise like riveting rivets will occur. The period may be fixed, but most of them have a fixed correspondence with the speed. The scars will be continuous on the channel. Occurs, the scars are visible on the steel ball from time to time, and this noise varies with the installation and lubrication conditions.
Measures to deal with this type of noise: Do not knock the bearing during installation, prevent the bearing from being skewed when the bearing is assembled with the shaft and then put it into the bearing housing; prevent bearing corrosion during storage and prevent shock and vibration during transportation; use high-viscosity grease .
3. Noise caused by lubrication factors
Wrong selection of lubricants, insufficient lubricants or aging and hardening can cause vibration and noise in the slewing ring/turntable bearing, and there is no fixed law for this noise.
Treatment countermeasures: In this case, only choose a suitable lubricant, adjust the amount of lubricant, extend the life of the lubricant and reasonably determine the replacement cycle.
4. Noise related to the host and countermeasures
This kind of noise is not simply caused by the bearing, so it is impossible to find the cause from the bearing alone. Attention should be paid to the mainframe, and the performance of the mainframe should be improved if necessary. Now we mainly describe the common buzzing sound and frame resonance sound in the motor.
1. The buzzing sound of the motor
The axial vibration of the motor shaft will cause a lot of high-frequency noise-the buzzing sound, the frequency of which is the same as the axial vibration frequency, and it can be constant or variable. The method of preventing buzzing is the same as that of preventing axial vibration.
2, countermeasures for bearing frame resonance sound
When the axial natural vibration of the outer ring mass system causes the axial bending natural vibration of the bearing frame, a kind of noise called resonance sound is generated. The method of increasing the preload can increase the axial natural frequency of the outer ring mass system, destroy the resonance condition and reduce the noise。
The above is the analysis and explanation of the four common slewing ring noise causes and treatment countermeasures. I hope to bring help to everyone. If noise is found during the slewing ring operation, it must be shut down for inspection and reasonable countermeasures are given.