Analysis and Treatment of Bearing Faults of Cement Machinery
One, fault principle
Bearing failures include failures of rolling elements and raceways, as well as failures of cages and seals. According to the characteristics of bearing failures and the nature of faults, it can be divided into 6 categories: noise, heating, abrasion, corrosion, vibration and assembly accidents.
Below we will discuss the causes and solutions of common bearing faults.
1. Noise
The cause of the bearing noise is due to the damage of the raceway surface or rolling body surface (impact, hammering, peeling, rust spots, etc.) and interference caused by incorrect assembly. Bearing noise is divided into two categories: impact noise and running noise. Impact noise usually occurs when the bearing is loaded for the first time or suddenly loaded, and will disappear after the rotation is stabilized. This kind of noise is caused by the impact of rolling body and raceway or rolling body and cage.
?Solution:
(1) Machining the bearing or replacement (when severe).
(2) anti-interference treatment at installation.
(3) Tighten the overall clearance or replace the bearing of a similar size, depending on the source of the interference.
2. Heating
Heating is caused by bearing tight fit and inadequate lubrication.
?Solution:
(1) Check the lubricant and determine whether it is the right lubricant.
(2) Change the size of the bearing and follow the recommendation of the bearing manufacturer.
(3) Check to see if the interior of the bearing is dry, due to lack of lubrication.
(4) Adjust the overall clearance of the bearing and keep it within the specified range.
3. Abrasion
Abrasion occurs when the bearing has incorrect preload and excessive clearance. It is also caused by poor quality lubricants, dirt, dust and lack of lubricant.
?Solution:
(1) Clean up the bearings and determine if there is any dirt inside.
(2) Select the correct preload and clearance.
(3) Use good quality lubricating oil and replace regularly.
(4) Maintain a good sealing environment for bearings.
4. corrosion
Cement machinery bearings are mostly made of carbon steel materials, and corrosion is caused by the lack of air, oil and water.
?Solution:
(1) Select antirust or corrosion resistant bearing materials.
(2) Apply grease to the bearings regularly.
(3) Install good seal and adjust air cooling system.
5. vibration
?Vibration is caused by defect of inner ring and outer ring, bad lubrication, dirt and so on.
?Solution:
(1) Clean bearing and tire to check whether there is any crack or change of shape.
(2) Replace the bearing with the same type of bearing.
(3) Replace grease regularly.
(4) Replace the outer ring and inner ring.
6. assembly accident
The common assembly accident of cement machinery bearing is the skew of inner ring and outer ring.
?Solution:
(1) Dismantle the bearing to check whether the outer ring and inner ring are skewed or damaged.
(2) Redo the assembly of the bearing.
(3) Install the bearing correctly and tighten bolts.
Second, conclusion
Cement machinery bearings are of great significance to the normal operation of cement plants. In order to ensure the performance and lifespan of cement machinery bearings, the operators of cement plants should pay close attention to bearing faults. According to the causes of common bearing failures, they should choose timely and correct methods to eliminate them. This can play an important role in improving the efficiency and reducing costs of cement machinery bearings.
