**Analysis of the Causes of Early Failure of High-Square Flat Screen Drive Shaft Bearings** Home > Bearing Knowledge > Analysis of the Cause of Early Failure of High-Square Flat Screen Drive Shaft Bearing *728*90 created on 2018/5/16* var cpro_id = "u3440131";

Analysis of the Causes of Early Failure of High-Square Flat Screen Drive Shaft Bearings

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The high-square flat screen is a crucial component in flour milling systems. 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 mills have reported that the drive shaft bearings of the high-square flat screen fail prematurely, causing production downtime and requiring frequent replacements. Some screens function well after bearing replacement, while others experience repeated failures within a short time. This issue has been studied extensively, and several factors contributing to early bearing failure have been identified. --- ### 1. Improper Installation Many manufacturers and users in China use mechanical tapping methods when installing or removing the drive shaft bearings and bushings. If the force is uneven, excessive, or improperly applied, it can lead to misalignment of the bearing within the housing. This improper installation causes uneven stress distribution between the upper and lower bearings, resulting in early damage. According to past analysis, improper installation accounts for approximately 15% of all early bearing failures in high-square flat screens. --- ### 2. Lubrication Issues Most high-square flat screens use unsealed spherical roller bearings such as 53620C3, 53B22C3 (GB 288-1987), or 22320E, 22322E (GB/T 288-1994). These bearings require regular lubrication with grease. However, different manufacturers use varying types and qualities of grease, leading to inconsistent performance. Common lubrication problems include: - **Insufficient Grease**: Not following the manufacturer’s guidelines for lubrication intervals or failing to open the exhaust plug during greasing leads to under-lubrication. - **Excessive Grease**: Overfilling the bearing cavity can cause overheating and reduce bearing life. - **Grease Contamination or Loss**: Poor sealing allows dust and particles to enter the bearing, or the grease may leak out, causing dry friction and premature wear. Lubrication issues contribute to about 35% of early bearing failures. --- ### 3. Contamination Contamination of the bearing or its grease is another major cause of failure. During installation or maintenance, poor environmental conditions can introduce foreign particles into the bearing. Additionally, if the seals are not properly maintained, flour dust and other contaminants can enter the bearing chamber, reducing its lifespan. This factor accounts for around 20% of early bearing failures. --- ### 4. Overloading and Mechanical Fatigue Overloading the equipment due to improper use, lack of maintenance, or exceeding design capacity can lead to excessive stress on the bearings. Misalignment, incorrect shaft alignment, or overproduction can cause the bearings to work under abnormal loads, accelerating fatigue and failure. Approximately 25% of early bearing failures are attributed to overload and mechanical fatigue. --- ### 5. Other Factors Poor-quality bearings or substandard machining of the bearing housing can also contribute to early failure. These account for roughly 5% of all cases. --- ### Conclusion In summary, early failure of high-square flat screen drive shaft bearings is primarily caused by improper installation, inadequate lubrication, contamination, mechanical overload, and quality issues. To improve system reliability and reduce downtime, manufacturers and users should focus on better installation practices, proper lubrication schedules, and maintaining clean working environments. By addressing these issues, flour mills can enhance the performance and longevity of their high-square flat screens, ultimately achieving better economic returns.

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