Common problems of ball mill and solutions to its failures

1. When the ball mill is running, there is a regular knocking sound, and the sound is very loud. When the ball mill rotates, the liner knocks against the grinding drum of the ball mill. According to the sound, determine the position of the ball mill liner, find the loose bolts and tighten them separately. 

2. The temperature of the ball mill and motor bearings rises and exceeds the requirement. Try to feel the bearings with your hands. If the temperature is too high, check and handle the ball mill from the following points. 

(1) Check the lubrication points of each component of the ball mill and check whether the brand of lubricating oil used is consistent with the factory instructions. 

(2) Check whether the lubricating oil and grease of the ball mill are deteriorated. 

(3) Check whether the lubrication pipeline of the ball mill is blocked, or the lubricating oil does not directly enter the lubrication point, and the insufficient oil volume causes heating. 

(4) The side clearance of the ball mill bearing is too small, the clearance between the bearing and the shaft is too large, and there are too many contact points, forming a uniform oil film on the bearing. 

(5) The ball mill's rolling bearings have too much or too little grease. Too much grease will form rolling elements, stirring the grease and generating heat, which is difficult to dissipate. If there is too little lubrication or poor lubrication, add enough oil as required, generally 1/3 to 1/2 of the bearing clearance.

(6) The sealing device of the hollow shaft at both ends of the ball mill body is too tight, or the iron parts of the sealing body are in direct contact with the shaft.

The above problems should be handled according to local conditions. Only when the bearing side clearance is too small or the bottom contact angle is too large, should the oil jack be used to lift the grinding cylinder, and the bearing should be pulled out from one side of the shaft and scraped separately.

3. Heating of ball mill reducer bearings: In addition to checking the temperature rise of the ball mill bearings, check whether the reducer exhaust holes are blocked and clear the exhaust holes.

4. The ball mill motor with reducer generates vibration after starting. The main reasons are as follows:

(1) The gap between the two wheels of the ball mill coupling is too small to compensate for the displacement caused by the self-centering of the magnetic core when the motor starts.

(2) The ball mill coupling alignment method is incorrect, resulting in the two shafts being out of center.

(3) The ball mill coupling bolts are tightened asymmetrically, and the tightening force is different.

(4) The outer ring of the ball mill bearing moves.

Treatment method: Adjust the gap between the two wheels according to the regulations to make the two shafts concentric. Tighten the coupling bolts symmetrically with the same torque.

When the rotor is unbalanced, the ball mill rotor should be pulled out for static balancing.

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