The slewing bearing can also be called a slewing ring bearing, and most people also call it a slewing ring. Just like the slewing bearing on an excavator, it is often called a slewing bearing. The slewing ring is a large bearing that can bear comprehensive loads, and can bear large axial and radial loads and overturning moments at the same time. Slewing ring bearings generally have mounting holes, internal or external gears, lubricating oil holes and sealing devices, so that the design of the main engine can be compact, easy to guide, and easy to maintain.
The problem now is that the sound of the excavator swing bearing during use is relatively loud, and there are also abnormal noises. What is the reason for this? At first we need to know that when the slewing bearing is idling just after leaving the factory, there will be a uniform sound of steel ball rolling, which is a normal sound; if it is just installed, it does not matter if there is a small abnormal sound, it will generally disappear after a period of rotation and running-in. . What we are talking about today is the louder and more special noises, and you need to pay attention when you hear special noises.
1. The mounting surface of the excavator turntable bearing is uneven and the mounting bolts are loose
When abnormal noise occurs, it is necessary to consider whether it is because of the installation operation. When the unevenness of the installation surface does not meet the requirements, it will cause the raceway to form a negative clearance, resulting in abnormal noise; in addition, when the pinion is poorly meshed In addition, when the mounting bolts are loose, the slewing bearing china will be elastically deformed, and a negative gap will be generated at the deformed position. It is necessary to check immediately and tighten the bolts as required.
2. There are foreign objects in the excavator turntable bearing
When there are foreign objects such as sand particles and iron filings inside the excavator slewing bearing, non-periodic vibration will occur, and at the same time, there will be a failure of inflexible rotation. When this happens, it is necessary to strictly clean the bearings, shafts, seat holes and matching parts before installation, and remove foreign objects in the lubricant in time; remember to avoid using plastic cages with impure materials or embedded foreign objects. This will remove the corresponding abnormal noise.
3. The problem of grease causes abnormal noise of excavator turntable bearing
The slewing bearing of the excavator is lubricated with grease, and the abnormal noise is likely to be caused by the lubrication problem. Common reasons are lack of grease in the raceway, uneven grease filling, poor quality and aging of grease, and wrong selection of lubricants. To solve this problem, just use the appropriate lubricant, fill it in time, and replace it in time.
4. Cracks, indentations or rust cause abnormal sound of excavator turntable bearings
When there are cracks, indentations or rust on the rolling surface of the excavator turntable slewing bearing, periodic vibrations like riveted rivets are also heard, and the scars will occur continuously on the channel, and this noise varies with the installation and lubrication conditions. The change. The liberation method is to not knock the bearing or use a high-viscosity grease during installation.
5. The raceway and rolling elements of the excavator turntable bearing are seriously worn
The abnormal noise of the excavator during the rotation is likely to be caused by the serious wear of the slewing bearing raceway and rolling elements. At this time, the slewing bearing needs to be repaired.
We all know that the working environment of excavators is relatively harsh, and excavator turntable bearings generally work under large loads. Abnormal noise of slewing bearings is a common problem. Don't worry if the slewing bearing makes noise, we only need to find the right cause and fix it accordingly.