**Analysis of the Causes of Early Failure of High-Square Flat Screen Drive Shaft Bearings**
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Source: Bearing Network | Time: March 29, 2014
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The high-square flat screen is a crucial component in flour mills. From the mid-1980s to the early 1990s, manufacturers faced issues such as cracking, breaking, and powder leakage in these screens. In recent years, many flour mill operators have reported that the drive shaft bearings of high-square flat screens often fail prematurely—leading to production downtime and costly replacements. Some units work well after replacement, while others experience repeated bearing failures within a short period.
Through detailed analysis and calculations, several key factors contributing to early bearing failure have been identified:
1. **Improper Installation**
Many manufacturers use mechanical tapping methods during installation, which can lead to misalignment or uneven force application. This results in improper orientation of the bearing in the housing, causing uneven stress distribution and early damage. According to past data, about 15% of early bearing failures are due to poor installation.
2. **Inadequate Lubrication**
Most high-square flat screens use open spherical roller bearings such as 53620C3, 53B22C3, 22320E, or 22322E. These bearings require regular lubrication with grease. However, improper lubrication practices—such as insufficient, excessive, or no lubrication—can cause serious issues. For example, over-lubrication can increase heat and reduce bearing life, while under-lubrication leads to dry friction and wear. About 35% of early failures are linked to lubrication problems.
3. **Contamination**
Bearings and their grease can become contaminated during installation or operation. Poor sealing of components like the top grid, discharge plate, and sieve door allows flour dust and particles to enter the bearing area, leading to premature wear. Contamination accounts for roughly 20% of early bearing failures.
4. **Overloading and Mechanical Fatigue**
Improper alignment of the drive shaft or overloading the system can cause excessive stress on the bearings. Over time, this leads to fatigue and early failure. About 25% of failures are attributed to mechanical overload and incorrect usage.
5. **Poor Quality Components**
Bearings made from substandard materials or poorly machined bearing housings can also contribute to early failure. This accounts for approximately 5% of all cases.
In conclusion, the main causes of early failure in high-square flat screen drive shaft bearings include improper installation, inadequate lubrication, contamination, mechanical overload, and low-quality components. To improve reliability and reduce downtime, it is essential to enhance production quality, proper installation, and maintenance practices. By addressing these issues, flour mills can achieve better economic performance and operational efficiency.
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This article was originally published on China Bearing Network.
Please cite the source: http://www.chinabearing.net
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