Ball Mill

Ball Mill Failure Reason And Emergency Plan

The ball mill has frequent failures and the output drops. Common fault causes and emergency plans are all here. Ball mills are widely used in cement, silicate products, new construction materials, refractories, fertilizers, black and non-ferrous metal beneficiation and glass ceramics, etc., and dry or wet grinding of various ores and other abrasive materials. The ball mill is a widely used mineral processing equipment. There will be some common faults during its use. This paper analyzes the causes of failures and hopes to provide better solutions for reference.

One, ball mill bearings overheat or melt, motor overload

Cause Analysis:

  1. 1. Lubrication is not in place, lubricating oil is interrupted or the amount of lubricating oil is insufficient;
  2. 2, bearing or coupling safety is not correct;
  3. 3, the gap between the journal and the bearing shell is too large or too small, and the contact is bad;
  4. 4, oil tank damage caused by oil can not flow into the journal or bearing;
  5. 5, cylinder or transmission shaft has a bend;
  6. 6, the main bearing cooling water or water temperature is high.

Solution:

  1. 1. Stop the machine to find out the reasons and solve specific problems.
  2. 2, check whether the lubrication situation is in place;
  3. 3, the correct installation of bearings or couplings;
  4. 4, adjust the journal and bearing gap, timely inspection of the oil tank;
  5. 5. Trimming barrel and journal;
  6. 6, increase the amount of water supply, reduce water temperature and so on.
ball mill ball mill

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

Cause Analysis:

  1. 1, motor system problems;
  2. 2. There are obstacles in the rotating part;
  3. 3. When the machine stops for a long time, the material and grinding body in the ball mill are not removed in time, and the wet material condenses into a block, and the machine starts;
  4. 4, grinding body does not drop, increase the motor load.

Solution:

  1. 1. Check and repair the motor system;
  2. 2, clear the rotating obstacles;
  3. 3. The material and the grinding body in the ball mill are cleaned, the agglomerated material and part of the grinding body are cleaned out, and the remaining material and the grinding body are agitated and mixed.

Third, the operation sound dull, reduce the amount of discharge, when the production is too low

Cause Analysis:

  1. 1, too much feed or into the abrasive grain hardness;
  2. 2, the material moisture is large, sticky ball paste grinding, scorpion block;
  3. 3, grinding body grade is not appropriate;
  4. 4. Damage to the partition board, grinding of the grinding body, unreasonable length of the warehouse, etc.;
  5. 5, powder separator back more material.

Solution:

  1. 1, timely adjust the amount of feeding and feeding granularity;
  2. 2, reduce the moisture of the material, clean the rake;
  3. 3, adjust the grinding body ratio;
  4. 4, Stop and replace the barrier board and adjust the length of each warehouse.
  5. 5, adjust the cycle load, maintenance separator.

Fourth, cylinder liner bolt hole leakage

Cause Analysis:

  1. 1, loose liner bolts;
  2. 2, sealing gasket wear;
  3. 3, liner bolts broken.

Solution:

  1. 1. Tighten or replace bolts, apply new gaskets, and replace liner if necessary;
  2. 2. After replacing the new bolts, it is better to use the nut belt washer on the outside of the mill barrel instead of the waste belt.

Fifth, gear transmission has a crash

Cause Analysis:

  1. 1, the gear wear too much or poor lubrication
  2. 2, gear pressure or assembly does not meet the quality requirements
  3. 3, loose bearing or bearing anchor bolts

Solution:

Stop the inspection and remove hidden dangers.

Six, the current is too large, the current is unstable

Cause Analysis:

  1. 1, the mill load is too high;
  2. 2, bad bearing lubricants;
  3. 3, excessive wear or failure of the transmission system;
  4. 4, uneven weight around the liner.

Solution:

  1. 1, adjust the load;
  2. 2, increase the amount of oil;
  3. 3, check the bearing shaft or gear and other transmission parts, and repair;
  4. 4, adjust the liner board.

Seven, lubrication system oil pressure is too high or too low

Cause Analysis:

  1. 1. Tubing plugging;
  2. 2. Insufficient oil in the tank;
  3. 3, the oil pump or oil pipe mixed with air or oil spill;
  4. 4, the oil pump fails.

Solution:

  1. 1. Stop grinding, check the tubing for blockage or oil leakage, and promptly repair or replace the tubing;
  2. 2, regular supplementary oil supply;
  3. 3, check whether the oil pump into the air or oil spills, timely processing.

Eight, drive gear tooth wear

Cause Analysis:

  1. 1, long-term operation, material fatigue;
  2. 2, gear vibration, increased gear dynamic load;
  3. 3, loose bolts in the transmission parts;
  4. 4, large bearing clearance;
  5. 5. The drive shaft is bent or the centerline of the transmission site is skewed.

Solution:

  1. 1, wear more than 30%, replace the new gear, wear slightly, flip the size of the gear used;
  2. 2. Find out the cause of the vibration and troubleshoot it;
  3. 3, fastening bolts;

  4. 4, reduce the bearing mat or replace the bearing;
  5. 5, straighten to find.

Nine, after starting the motor with a reducer, the vibration occurs

Cause Analysis:

  1. 1. The two-wheel clearance of the coupling section is too small to compensate for the amount of turbulence caused by its own magnetic center when the motor starts;
  2. 2. The gear couplings of the reducer, motor and transmission shaft do not maintain high coaxiality, resulting in two shafts that are not concentric;
  3. 3, the connecting bolts of the coupling are not symmetrically tightened, and the fastening force is different in size;
  4. 4, the bearing outer ring is not fixed.

Solution:

  1. 1, according to the provisions of the wheel clearance adjustment, so that two axes concentric;
  2. 2. Symmetrically fasten the connecting bolts of the coupling with equal torque;
  3. 3. When the rotor is out of balance, pull out the rotor of the ball mill to find a balance point.

In order to find problems in time to eliminate hidden dangers to ensure the normal operation of the ball mill, in addition to daily maintenance, it is necessary to stop grinding periodically, and regularly check and maintain important components such as hollow shafts, main bearings, cylinders, speed reducers, and large and small gears. . The maintenance and overhaul of the ball mill is a regular work. Correct and reasonable maintenance can effectively improve the operating efficiency and service life of the ball mill.

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