Common failures of limestone vertical mills and their countermeasures
Vertical mill is one of the main beneficiation equipment at present. There will always be some faults in the process of use. Some users have no way to start when facing the fault. Therefore, we will come from the following perspective (fault->cause->solution) Summarize the common failures and corresponding methods of vertical mills.

limestone vertical mill

1. The bearing of limestone vertical mill is overheated and the motor is overloaded.

Reasons: Inadequate lubrication, interruption of lubricating oil or insufficient amount of lubricating oil; the bearing or coupling is not properly rotated; the gap between the journal and the bearing bush is too large or too small, and the contact is poor; the oil groove is damaged and the oil cannot flow into the journal or the bearing bush Wait.
Solution: stop the machine to find out the cause, and solve the specific problems in detail. Check whether the lubrication is in place; install the bearing or coupling correctly; adjust the gap between the journal and the bearing bush, and check the oil groove in time.

2. The running sound of the limestone vertical mill is dull, the reading of the ammeter drops, and the output is small

Reasons: Too much filling material and large particle size; material moisture is large, sticky ball grinding, grate clogging; improper filling of grinding body, or misalignment due to channeling, unreasonable length of each silo, etc.
Solution: reduce the filling material and reduce the particle size of the mill; reduce the moisture of the material and clean the grate; adjust the proportion of the grinding body and the length of each bin.

3. The reducer bearing heats up and the running sound is abnormal

Reason: The exhaust hole of the reducer is blocked; the balance wheel and the intermediate wheel of the reducer are not installed according to the specified meshing teeth.
Solution: Check the temperature of the reducer bearing and clear the exhaust hole; the balance wheel and the intermediate wheel are installed according to the specified meshing teeth.

4. Partial abrasion of the cylinder

Reason: The liner is not installed in a wrong position; the liner continues to run after it falls off; there is material scouring between the liner and the cylinder.
Solution: stagger the liner; repair or replace the liner; make the liner closely fit the cylinder.

5. The oil pressure of the lubrication system is too high or too low

Reasons: oil pipes are blocked or leaking; insufficient oil supply; oil pump problems.
Solution: Check whether the oil pipe is blocked or leaking, repair or replace the oil pipe in time; add oil regularly; check whether the oil pump enters air or leaks, and deal with it in time.

6. The limestone vertical mill cannot be started or the motor is overloaded when starting

Cause: The motor system has a problem; there are obstacles in the rotating part; the material and grinding body in the limestone vertical mill are not removed in time when the limestone vertical mill is stopped for a long time, and the damp material condenses into blocks. When the machine starts, the grinding body does not fall off, which increases the load of the motor.
Solution: Check and repair the motor system; clean up the obstacles in the rotating part; clean up the materials and grinding bodies in the limestone vertical mill, remove the agglomerated materials and part of the grinding bodies, and stir and mix the remaining materials and grinding bodies.

7. After starting the motor with reducer, vibration occurs

Reason: The gap between the two wheels of the coupling is too small, and it is difficult to compensate for the amount of movement caused by the magnetic center of the motor when the motor starts; the transmission coupling of the reducer, the motor and the drive shaft does not maintain high coaxiality, resulting in two shafts Not concentric; the connecting bolts of the coupling are not tightened symmetrically, and the tightening force is different; the outer ring of the bearing is not fixed.
Solution: Adjust the wheel clearance according to the regulations to make the two shafts concentric; symmetrically tighten the connecting bolts of the coupling with the same torque; when the rotor is unbalanced, pull out the limestone vertical mill rotor to find the balance point again.

8. Mill vibration, abnormal axial movement

Reason: local sinking of the foundation ground at the bottom of the machine caused the installation of the mill to be uneven; the bottom of the foundation was eroded due to oil leakage, and the bottom bolts were loose.
Solution: You can stop the machine for processing, add pads to adjust the sinking part to make the ground level at the bottom of the machine; knock off the secondary grouting layer eroded by the oil, and re-bury the anchor bolts, then adjust the mill, and then tighten the anchor bolts .

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