The common noise of slewing bearing is dust and scar. The methods to solve the noise of slewing bearing are as follows:
1. Noise caused by lubrication factors: Insufficient lubricant, wrong choice of lubricant or aging and hardening can cause vibration and noise of the slewing bearing, and this noise has no certain regularity. In this case, only select the appropriate lubricant, adjust the lubricant quantity, extend the service life of the lubricant and reasonably determine the replacement cycle.
2. Scarring noise control method: If there is a crack, indentation or rust on the rolling surface of the slewing bearing, periodic vibration and noise such as riveted rivet will occur. Its cycle may be fixed, but it is mostly related to the speed of rotation. The scar will occur continuously on the raceway and the scar will appear on the steel ball from time to time, and the noise will vary with the installation and lubrication conditions. Do not knock the bearing during installation and prevent the bearing from tilting when the bearing is assembled with the shaft and then installed in the bearing seat; Prevent bearing corrosion during storage and shock vibration during transportation; Use high viscosity grease.
3. Dust Noise Control Method: If there is dust and other foreign matter in the slewing bearing, non-periodic vibration will occur. The vibration and noise of dust noise may vary and may or may not be present. Improve the cleaning method of the slewing bearing, and strictly clean the bearing, shaft, seat hole and mating parts before installation; remove foreign materials in the lubricant; improve the sealing of the bearings; avoid using plastic cages with impure materials or embedded foreign materials.
4. Noise related to the main engine and its countermeasures: This noise is not caused by the bearing alone, so it is invalid to find the cause from the bearing alone. Full attention should be paid to the main engine, and the performance of the main engine should be improved if necessary.
This paper mainly describes the common engine noise and frame resonance. Engine noise: the axial vibration of the engine shaft will cause large high frequency noise - noise, whose frequency is the same as the axial vibration frequency, which can be constant or variable.The prevention method of noise is the same as that of axial vibration. Bearing frame resonance noise: When the axial natural vibration of the said outer ring mass system causes the axial bending natural vibration of the bearing frame, a noise called resonance noise is generated. Adding preload can improve the axial natural frequency of the outer ring mass system, eliminate the resonance condition and reduce the noise.