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Ball mill test run and common fault handling

 

  1, The ball mill in the trial run, often problems and treatments


  1) Ball mill during operation, there is a regular tapping sound and the sound is loud. Some of the lining bolts are not tightened. When the ball mill rotates, the lining plate strikes the ball mill to grind the cylinder body. Determine the part of the ball mill lining according to the sound, find the loosen bolt and tighten it separately.

  2 Ball mill and motor bearing temperature rise, exceeding the regulations. If you try to test the bearing by hand or the temperature is too high, check the ball mill from the following items.


  (1) Check the lubrication points of each part of the ball mill. The lubricating oil grade used is consistent with the factory manual.

  (2) Check if the ball mill lubricant and grease are deteriorated.

  (3) Check if the lubrication line of the ball mill is clogged, or the lubricating oil does not directly enter the lubrication point, and the oil quantity is sufficient to cause heat.

  (4) The side clearance of the ball mill bush is too small, the gap between the bush and the shaft is too large, and t eh contact points are too much to form a uniform oil film on the bearing bush.

  (5) The ball mill rolling bearing has too much or too little grease, and excessively formed rolling elements agitate the grease to generate heat, and the heat is not easily dissipated. Too little lubrication, the amount of oil should be increased according to the regulations, generally 1/3~1/2 of the bearing clearance is more appropriate.

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

  3, Ball mill reducer bearing heat:


  In addition to checking the temperature rise of the ball mill bearing, check whether the vent hole of the reducer is blocked, and clear the vent hole.

  4, After the ball mill motor is started with the reducer, vibration occurs. The main reasons are:


  (1) The two-wheel clearance of the ball mill coupling is too small to compensate for the amount of turbulence caused by the self-seeking magnetic center when the motor is started.

  (2) The correcting method of the ball mill coupling section is incorrect, causing the two axes to be different.

  (3) The coupling bolts of the ball mill coupling have no symmetrical tightening and the degree of tightening force is different.

  (4) Ball mill bearing outer ring activities.

  Treatment method: Adjust the wheel gap according to the specified, so that the two axes are concentric. Tighten the coupling bolts of the coupling symmetrically with the same torque.

  5, When the ball mill reducer drives the mill, huge vibration occurs:


  (1) The balance shaft of the ball mill and the reducer, the axis is not in line, the reason is:

  When the mill is installed with the lining, no secondary grouting is performed, or the anchor bolts after the secondary grouting are not fastened, and the grinding cylinder is rotated by the hoisting machine, so that one end of the grinding cylinder is displace, and the two axes are not in a straight line. The vibration is generated after the reducer drives the mill.

  (2) The large ball mill is bulky and heavy, causing the foundation to sink; displacement occurs. Monitoring settlement points are set up next to the foundation; observations are made and adjustments are made when there is sinking.

  6, The ball mill reducer operates abnormally:


  The sound of the ball mill reducer running normally should be even and stable. If the gear has a slight knocking sound, the hoarse friction sound, there is no obvious change during the operation, you can continue to observe, find out the reason, the ball mill stops for processing, if the sound is getting louder, you should immediately stop the ball mill for inspection.
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