Causes and treatment methods of ball mill bearing damage

This problem of ball mill bearings is generally repaired in the following ways:

1. The replacement of new parts is restricted by factors such as disassembly, time, spare parts and the value of spare parts, and it is difficult to meet the production needs of enterprises at the first time.

2. The overall effect of surfacing repair is not ideal through practical application. There are two main reasons: one is the difference in materials; The second is the influence of high temperature damage and thermal stress of repair welding.

4. The use of polymer composite materials for repair, such as 2211F metal repair materials, this material is the best solution for repairing the wear of shafts by using the unique mechanical properties of polymer materials and targeted repair processes. Its advantages are good material adhesion, good compressive performance and comprehensive mechanical properties to achieve first-class repair, high repair efficiency, no need to disassemble a large number of equipment, under normal circumstances, repair within 8 hours. The material is similar to a cold welding technology, which does not produce high temperature during the repair process, which protects the equipment body from damage and is not limited by the unilateral wear of the shaft during the repair process.

Under the premise of normal maintenance of the equipment, the service life after repair is even higher than the service life of new components, with high repair efficiency, which can be repaired and repaired, providing a powerful solution for enterprise equipment maintenance.

From the above four technologies, it can be seen that the use of polymer composite materials for repair is the most cost-effective, and the repair effect is good; **Repair, no need to dismantle and dismantle; Short repair time, suitable for short downtime; The repair process is easy to learn and master, and the maintenance cost can be greatly reduced after mastering the technology.

Causes of heat generation of rolling bearings in ball mills:

1) Excessive grease;

2) The gap between the roller and the inner and outer coat is too large, the bearing body is pitted or peeled, the inner and outer coat rotates, and the cage is damaged;

3) The bearing scraping is not good, and the bearing contact surface is small;

4) The gap between the bearing pad and the journal is too small or too large;

5) The oil is cut off or the oil ring is not flexible, and it cannot bring enough lubricating oil;

6) The lubricating grease grade is incorrect or there are impurities in the oil that destroy the formation of the oil film;

7) The implementation of forced mechanical oil supply may also be due to the leakage of the water cooler to mix oil and water, and the physical properties of the oil will be damaged.

Treatment method of heat generation of rolling bearings of ball mill:

1) Rolling bearings must be cleaned with gasoline or diesel oil when newly installed or cleaned and oiled, and can be filled with qualified grease of the specified grade only after drying, and the filling of grease should not be overfilled, and the two-stage motor fills the cavity of 1 2, and the motor above the second level fills the cavity of 1 2-1 3. The rolling bearing should be checked regularly, and the above abnormal symptoms should be replaced in time, and at the same time, the seal should be strengthened in daily maintenance, the oil should be changed regularly, and the bearing cover and motor end cover should be installed in place.

2) For rolling bearings with large journals, they can be boiled in oil less than 110 and then hot-installed to prevent damage to the bearing and strain the journal.

3) For the unexplained increase in tile temperature, it is necessary to check the wear of the alloy tile in time to ensure that the oil line is unblocked, the contact point shall not be less than 6 points per square centimeter, the contact surface between the journal and the bearing shall not be less than 80%, and the left and right along the radial vertical line of the tile shall not be less than 35°.

Here are the most common causes of early bearing failure; There are many reasons for early bearing failure, but the following are the main considerations, sometimes a combination of them. If the bearing is selected accurately, the installation method is accurate, the lubrication method and lubricant selection are accurate, the bearing can work normally for a long time.

1. Improper installation (about 16%)

1. Use brute force during installation, and directly hit the bearing with a hammer to cause the greatest damage to the bearing; It is the main cause of deformation.

2. The installation is not in place, the installation is deviated or not installed to the bearing position, resulting in the bearing clearance passing through the inner and outer rings of the school is not in a unified rotation, resulting in a small ball mill with different centers.

Suggestion: Choose appropriate or professional bearing installation tools, and use special instruments to test after installation.

2. Poor lubrication (about 50%)

According to the investigation, poor lubrication is one of the main causes of premature failure of bearings in gangue crushers. The main reasons include: not filling the lubricant or oil in time; The lubricant or oil is not filled in place; Improper selection of lubricants or lubricating oils; Inaccurate lubrication and so on.

Suggestion: Choose the right lubricant or oil, use the correct lubrication filling method ball mill manufacturer.

3. Pollution (about 14%)

Premature bearing damage can also be caused by contamination, which means that sand, dust, metal shavings, etc. enter the bearing. The main reasons include: contamination caused by opening the bearing package too early before use; The working environment is not clean during installation, causing pollution; The working environment of the bearing is not clean, and the working medium is polluted.

Suggestion: It is best not to unpack the bearing before use; Keep the installation environment clean during installation and clean the bearings to be used; Strengthens the sealing device of the bearing.

4. Fatigue (about 34%)

Exhaustion damage is a common way to damage the bearing, spiral sand washer. Common causes of fatigue damage may be: long-term overload operation of bearings; Failure to repair in a timely manner; improper maintenance; equipment aging, etc.

Suggestion: Select the appropriate bearing type and replace the tired bearing on time.

Common faults and troubleshooting methods of ball mills.

The temperature of the main bearing is too high, resulting in pitting or melting, which may be caused by one of the following reasons:

If the lubricating oil is interrupted or the oil quantity is insufficient, if the oil is found to be cut off, the feeding water should be stopped immediately, the observation hole cover on the bearing should be opened, and the bearing temperature should be checked by probing with your hand (pay attention to prevent the handle from being burned). If the bearing has not been overheated, it can be stopped to deal with the oil circuit failure; If the temperature of the bearing is quite high, when the hand is close to the hollow journal and feels hot and smoking, do not stop, and cool it with artificial oil from the bearing until the bearing temperature returns to normal. If the car is stopped without taking cooling measures, not only can not avoid the bearing burning, but also will cause a serious accident of the hollow shaft and the large tile "locking".

The lubricating oil is too thick or too thin, and the elimination method is as follows: the lubricating oil model can be re-selected; Stop using cooling water or heating with resistance.

1. Poor lubrication or lubricating oil mixed with impurities, dates, metals, etc.;

2. The meshing gap is too large or too small, and the contact is poor;

3. The quality of gear processing does not meet the requirements;

4. The material is not good, and the hardness of the tooth surface key ant is not enough;

5. Poor assembly;

6. Mineral sand and other abrasive grains enter between the teeth.

Treatment method: 1. Strengthen lubrication or replace lubricating oil;

2. Adjustment; 3. Repair and improve;

4. Quenching and tempering treatment;

5. Readjustment;

6. Cleaning. This information is available in:

Causes of failure: 1. The coupling of the transmission shaft is installed incorrectly and the deviation is too large; 2. The load on the transmission shaft is too large; 3. The strength of the transmission shaft is not enough or the material is not good; 4. The meshing of large and small gears is poor, especially the tooth surface is seriously worn and the vibration is strong; 5. The bearing is not installed properly, or its connecting bolts are loose (or too tight).

Solution: 1. Re-install and adjust the coupling; 2. Prevent overload; 3. Replace the transmission shaft of ***; 4. Install the gear correctly, and repair or replace it in time when the gear surface is worn to a certain extent; 5. Adjust the bearing installation, replace the bolts, and tighten it appropriately.

If you are a customer of ball mills, or have any problems in the use of ball mills, we will provide you with professional solutions for ball mill applications for free! Call now to learn more, and I believe that communication with "emerging" people will definitely help you choose! You can also log in to our factory**:

Gongyi Xinxing Machinery Factory.

During the working process of the ball mill, the main bearing temperature is too high due to the following reasons.

1) Lubricating oil interruption or oil deficiency is the most severe. For the reasons and treatment methods of oil cut-off or oil shortage, please refer to the "Fault Diagnosis and Treatment Methods for Main Bearing Oil Breakage in Ball Mill".

2) The lubricating oil is too thick or too thin. Except for a small part of the heat generated by the main bearing, it is conducted by the metal. A large amount of it is carried away by lubricating oil.

When the lubricating oil is too thick, the fluidity is very poor, and the heat cannot be taken away in time, causing the main bearing to heat up. When the lubricating oil is too thin, it cannot form the oil film of liquid magic rubbing, and the metal is directly rubbed, so it heats up quickly.

The lubricating oil is too thick or too thin because the oil type is not properly selected, or the oil type is basically suitable, but the temperature is too low to increase the viscosity of the oil and the fluidity is poor. The solution is to re-select the lubricating oil, or stop the supply of cooling water or heat it with a heater.

3) Deterioration of lubricating oil. Deterioration of the lubricating oil will lose its lubricating properties, causing the bearing to heat up. In addition to replacing the lubricating oil, the lubrication parts, oil pipes, oil tanks, etc. should also be cleaned.

4) The scraping of the ball mill bearing does not meet the requirements. When the bearing is scraped and grinded, if the tile mouth scraping is not enough. Too tight fit with hollow journals; There are too many contact points between the tile surface and the journal; If the oil groove is not scraped on the pad surface, etc., it will cause the bearing to heat up.

This is because the weight of the entire rotating part of the mill is pressed on the bearings. The pressure of the journal on the bearing is very large, when the bearing and the journal fit too tightly, or the contact point between the bearing surface and the journal is too much or there is no oil groove, the lubricating oil can not enter the contact surface, and can not play a lubricating role. The solution is to check the quality of the bearing scraping

Re-scratch. until the technical requirements are met.

5) Fall into debris. When the slurry or mud and other debris enter the friction surface between the journal and the bearing, the coordination between the bearing and the journal will be seriously damaged, and the surface of the bearing and the journal will be grooved, and the friction will be aggravated. Causes fever. The solution is to remove debris and re-grind the bearings.

Analysis and treatment methods of the causes of vibration of gear or bearing of ball mill: Cause analysis: 1. Serious gear wear; 2. Poor gear meshing, large gear ring runout deviation is too large; 3. The gear machining accuracy does not meet the requirements; 4. The fixing bolt or the connecting bolt of the large gear is loose; 5. Serious wear of bearing pads; 6. The connecting bolts of the bearing seat are loose; 7. The bearing is not installed properly.

The processor imitates the method: stop the car for inspection, and take corresponding measures to eliminate, repair, adjust or replace the gear according to the specific situation of the fault; repair and research bearing bearings; aligning bearings; Tighten all sock bolts. If you are a customer of the ball mill, or have any problems with the use of the ball mill, we will provide you with a professional solution for the ball mill application free of charge!

Gongyi Xinxing Machinery Factory.

The ellipticism error of the hollow journal is too large or the cylindricity error is too large, and there are deep concave and convex marks on the surface, resulting in cracks or holes.

The hollow shaft is axially cracked, and the crack extends from the center position to both ends along the axial direction at the same time, and penetrates the shaft wall in severe cases. Typically, the crack is not perpendicular to the center, but is an irregular diagonal line.

The inner bore of the hollow shaft is seriously worn, and the diameter of the bore becomes larger, and the maximum wear of some is more than 50%.

Reason analysis: after long-term operation, the hollow shaft will naturally bring the wear of the hollow shaft due to material fatigue, but the occasional poor maintenance will also aggravate the wear of the hollow shaft, if a small amount of material enters the inner hole of the hollow shaft at the feeding end and the spiral cylinder, it will cause serious wear and tear of the hollow shaft inner hole. If it is worn to a certain extent and not found and repaired in time, it will cause cracks, holes, etc., which will affect the continuous operation of the ball mill and must be repaired.