**Cement Mill Main Bearing Lubrication and Maintenance**
Home > Bearing Knowledge > Cement Mill Main Bearing Lubrication
Source: Bearing Network | Date: February 10, 2014
Maintaining the proper lubrication of the main bearing in a cement mill is essential for smooth operation and preventing costly failures. Operators should regularly monitor the oil temperature, oil quality, and oil level in the main bearing. If the bearing temperature is abnormal, it’s important to increase the frequency of inspections and report any issues immediately.
In practice, two common situations can lead to serious damage, such as burning the bearing bush:
1. **Loose Bolts and Misalignment**: If the bolts securing the upper cover of the main bearing loosen, it can cause the scraper and fixed oil ring to shift out of position. This prevents the proper scraping of lubricating oil, leading to oil dripping onto the hollow shaft journal and causing the bearing bush to run dry and eventually burn.
2. **Blocked Oil Return Path**: Dust and impurities can clog the oil return path in the main bearing base, preventing the fixed oil ring from drawing lubricant from the oil chamber. This lack of lubrication can also result in bearing failure.
It's important to follow the recommended oil change intervals and add or replace the lubricant in the correct amount. Proper storage of both new and used oil should also be maintained to ensure quality and environmental compliance.
Choosing the right type of lubricant and adding appropriate additives can significantly improve the performance of the main bearing. The main bearing in a cement mill operates under high load, high speed, and with significant impact and vibration. Additionally, the size and surface finish of the bearing bush and hollow shaft are influenced by manufacturing limitations. As a result, complete liquid lubrication is often not achieved, and the formation of an oil film is critical to reducing friction and wear.
The selection of lubricant depends on factors such as operating temperature, linear speed of the hollow shaft, and the load on the main bearing. In southern regions, for example, a 2.2m x 6.5m cement mill can use N220 or N320 industrial gear oil depending on the season. Since the discharge end of the mill typically operates at a higher temperature than the feeding end, it may be beneficial to use a higher viscosity lubricant there.
Additionally, including a stearic acid polar additive in the lubricant can enhance the strength of the oil film and prevent it from breaking down under stress.
**Related Bearing Knowledge:**
- Causes of fan bearing failure and methods for cleaning sliding bearings
- Details on bearing dimensions and component sizes
- Common knowledge about contact ball bearings
- Analysis of early failure in high-level flat screen drive shaft bearings
This article is sourced from China Bearing Network.
For more information, visit [http://www.chinabearing.net](http://www.chinabearing.net)
Previous: Bearing Seal Types
Next: How to Determine if a Bearing Can Be Reused
LPG Mass Flow Meter
Zhejiang Sealand Technology Co., Ltd. is a trustworthy manufacturer of LPG Mass Flow Meter, LPG Mass Flowmeter, LPG Flow Meter, LPG Flowmeter, LPG meter, ATEX, IECEx & CE approved.
Sealand have DN03 to DN150 size meters and are developing bigger models. Each meter can be connected with your computer through a USB-to-RS485 converter. The detail steps are as follows. Connect the meter and computer with a USB-to-RS485 converter( converter A+ end to transmitter A+ end, B- to B-, and GND to GDN); turn to device manager of the computer to check COM port connected with meter. Start the software, select the right COM port and click Connect; do not change any other parameters (if you do not know the right one, click Automatic options on the left, click Connect, plug & unplug the transmitter, and then check if it is connected). You can click Connect on the tool bar to disconnect or connect again. It will shown Connected/Not Connected at the bottom of this interface.
LPG Mass Flow Meter, LPG Mass Flowmeter, LPG Flow Meter, LPG Flowmeter, LPG meter
Zhejiang Sealand Technology Co., Ltd. , https://www.sealandflowmeter.com