Ball mill 5 kinds of fault judgment and solution

The failure of the ball mill in the grinding operation may affect the output of the mill and even the progress of the operation, which is a very urgent matter. Once the failure occurs, a solution should be developed as soon as possible, and the fault should be eliminated as soon as possible, so that the ball mill can resume production, so as to ensure that the interlinked production line is completed within the specified time and smoothly meets the standard. Therefore, the ball mill failure should not be underestimated, Xiaobian sorted out the ball mill fault complete, and classified the judgment method for different types of faults, easy to find, hope to help you!

First, judge the fault from the sound
When the ball mill is running normally, the grinding sound is clear and loud, and there is no rattling sound of the steel ball coming out of the liner, accompanied by not too strong impact sound. If the sound is abnormal, the noise of the ball mill is too large, it may be that the ball mill is faulty.

1, when the ball mill is running, there is a regular knocking sound, and the sound is very large

The reason is that part of the liner bolt is not tightened, and when the ball mill rotates, the liner strikes the ball mill cylinder. According to the sound judge the ball mill liner parts, find loose bolts, tighten.

2, the ball mill reducer running sound abnormal

The sound of the normal operation of the ball mill reducer should be uniform and smooth. If the gear has a slight knocking sound, hoarse friction sound, no obvious change in operation, you can continue to observe, find out the cause, the ball mill stop for processing, such as the sound is getting louder, should immediately stop the ball mill for inspection.

3, the running sound is dull, the discharge volume is reduced, and the hourly production is too low

The solution is to adjust the feeding amount and feeding particle size in time, reduce the material moisture, clean the grate, adjust the ratio of the grinding body, stop and replace the silo board, adjust the length of each silo, adjust the cycle load, and overhaul the powder separator.

4, the ball mill after a long time of operation, due to serious wear of the lining or loosening of the connection bolt, the lining often falls off, affecting the normal operation of the equipment.

The specific process is as follows: abnormal sound appears in the mill, and the noise is larger; The impact sound of the grinding medium at the lining plate is too loud and crisp. If the above situation is found, the ball mill should be stopped immediately, replace the liner or replace the liner with a better quality.

Second, judging the ball mill fault from the temperature

1, ball mill bearing overheating or melting, motor overload

Check whether the lubricating oil is sufficient, whether the bearing or coupling is installed correctly, whether the clearance between the journal and the bearing bush is proper, whether the oil groove is damaged, resulting in the oil cannot flow into the journal or the bearing bush, the cylinder or the drive shaft is bent, whether the main bearing cooling water is sufficient or whether the water temperature is normal; If the problem is found, it should be dealt with promptly and repaired properly.

2, the main bearing tile failure

If there is a main bearing tile failure, the ball mill should be improved, the specific improvement measures are as follows:

The main bearing type structure is replaced, the rocker type structure is adopted, the adjustment space is increased, the contact frequency is reduced, the aligning is more flexible and convenient, and the installation is efficient and fast. The contact surface between the grinding plate and the tile body is replaced with a large circular arc surface, which increases the activity range of the tile body and eliminates friction and sticking. The mill lubrication system adopts static pressure lubrication to ensure the normal operation of the high pressure system in the mill production, so that there is always a certain oil film thickness between the hollow shaft and the bearing shell, which not only reduces the bearing temperature, but also has a larger oil film thickness between the hollow shaft and the bearing in this lubrication state, and the friction in the operation of the main bearing is smaller and safer. Ensure the cooling water system smooth, and regularly clean the cooling water system.

Third, judging from the abnormal vibration of the ball mill fault after the ball mill motor with reducer starts, vibration occurs, the main reasons are:

1, bearing outer ring activity

Treatment method: Adjust the clearance of the wheel according to the provisions, so that the two axes are concentric. Tighten the coupling bolts symmetrically with equal torque.

2, when the rotor is unbalanced, the ball mill rotor is drawn out to find a static balance

The large ball mill is large in volume and heavy in weight, which makes the foundation sink. A shift occurs. A monitoring settlement point is set beside the foundation; Observations are made and adjustments are made when subsidence is found.

Fourth, judging the fault of the ball mill from the material leakage, string material and running rough

1, cylinder liner bolt hole leakage

The reasons for this are: the liner bolt is loose, the seal washer is worn, and the liner bolt is broken; It can be solved by tightening and replacing the bolts, putting on a new sealing gasket, and changing the nut point ring of the whole body of the mill to a waste belt.

2, bearing feed slurry failure

The bearing of the ball mill has a string of materials, and the slurry has penetrated into the bearing at the discharge end, destroying the bearing seal, and the seal has been seriously damaged. The production practice has proved that the main reason for the bearing feed slurry in the dynamic production process of ball mill is the unreasonable factors in the structure design of the discharge end of ball mill.

Improvement measures:

The corresponding sealing device is selected according to the actual situation, and the bearing hot loading process on the discharge end is completed according to the process conditions and parameters. There is no relative movement between the discharge end, the slag discharge port and the maze ring, and there is no gap, which effectively controls the problem that the slurry often enters the bearing. The diameter of the inner hole should be increased to a certain diameter, and the position of the discharge port should be extended to ensure that the distance between the position of the discharge port and the position of the discharge port is between 120 ~ 122mm, so as to avoid the gap between the discharge port and the discharge port from flowing into the slurry. A fender is welded at the corresponding position between the discharge port and the slag discharge port, and a reflux device is added to the slag discharge port and the fender, and another round steel is welded to realize that the slurry does not enter the bearing during normal production.

3, compartment board failure

After the ball mill runs for a period of time, the silo plate is destroyed by the steel ball and fails, resulting in coarse materials, unqualified pulp products, short replacement cycle of equipment spare parts, which does not belong to normal wear and failure.

Improvement measures:

It is recommended to replace the single compartment structure with a double compartment structure. The steel structure frame material is used to increase the internal lifting plate, so that the material can effectively enter the second warehouse, reduce the impact force of the material on the compartment plate, and protect the frame body. T-shaped or L-shaped fixed structure is selected, so that the steel structure compartment plate and the barrel are bolted together to increase the service cycle of the compartment plate and maintain the rigidity and stability of the steel structure.

Fifth, other failures

1， The feeder bolt is broken

The ball mill uses multi-head combined feeder to feed, and 16-M30 bolts are connected with the feed port. The bolts often break during the operation of the ball mill.

Improvement measures: Check the bolts at the discharge port regularly, and tighten and replace the bolts in time when the bolts are broken.

2，the ball mill can not start or start the motor overload

The reasons for this failure may be: there are problems in the motor system, there are obstacles in the rotating part, long-term shutdown, the material and the grinding body in the ball mill are not removed in time, the wet material condenses into a block, the grinding body is not thrown off when the machine starts, and the motor load is increased.

Solution: Check and repair the motor system, clean up the obstacles in the rotating part, clean up the materials and grinding body in the ball mill, clean up the caked materials and part of the grinding body, and stir the remaining materials and grinding body.

3，the current is too large, the current is unstable

The reasons for the current instability are: the mill load is too high, the bearing lubricating oil is poor, the transmission system is excessive wear or failure, and the weight around the liner is uneven. Solution: Adjust the load, increase the oil supply, check the bearing shaft or gear and other transmission parts, and repair, adjust the liner.

4， The oil pressure of the lubrication system is too high or too low

The causes are: oil pipe blockage, insufficient oil in the tank, oil pump or oil pipe mixed with air or oil leakage, oil pump failure.

Solution: Stop grinding, check whether the oil pipe is blocked or leaking oil, timely repair or replace the oil pipe, regularly supplement the oil supply, check whether the oil pump enters the air or leaks oil, and deal with it in time.

5，transmission gear tooth thickness wear

Failure causes: long-term operation, material fatigue, gear vibration, increased gear dynamic load, loose bolts in the transmission part, large bearing clearance, bending of the transmission shaft or the center line of the transmission part is skewed.

Solution: Wear more than 30%, replace the new gear, wear slight, turn the size of the gear to use, find out the cause of vibration, troubleshooting, tightening bolts, reduce the bearing pad or replace the bearing, straightening.