Industrial Grinding Mill Maintenance Standards and Operation Procedures
1. Purpose and Scope
These standards aim to standardize the routine inspection and maintenance of ball mills and grinding mills, clarify operational standards and technical requirements for each maintenance step, identify and eliminate potential failure risks in a timely manner, ensure equipment operates safely, stably, and efficiently, and reduce operation and maintenance costs.
2. Daily Inspection Items
2.1 Feed System
- Check feed quantity and material condition for consistency
- Inspect feed chute for blockages or wear
- Verify feed belt or conveyor operation
- Monitor moisture content of feed material if applicable
2.2 Main Drive System
- Check main motor current draw and temperature
- Inspect drive coupling condition
- Verify gear reducer oil level and temperature
- Check for unusual vibration in the drive train
2.3 Bearing System
- Monitor main bearing temperature (should not exceed 55-60C)
- Check bearing lubrication oil flow and pressure
- Listen for abnormal bearing noise
- Inspect bearing seals for oil leakage
2.4 Mill Shell and Discharge
- Inspect mill shell for cracks or loose bolts
- Check discharge grate condition
- Verify discharge chute is clear
- Monitor product fineness and particle size distribution
3. Common Fault Diagnosis and Troubleshooting
3.1 High Bearing Temperature
- Cause: Insufficient lubrication, contaminated oil, bearing damage, misalignment
- Solution: Check oil flow, replace oil if contaminated, inspect bearing, verify alignment
3.2 Abnormal Vibration
- Cause: Uneven liner wear, loose foundation bolts, unbalanced load, gear damage
- Solution: Inspect liners, tighten bolts, balance load, inspect gearing
3.3 Reduced Grinding Efficiency
- Cause: Worn grinding media, excessive feed moisture, liner wear, feed size too large
- Solution: Replenish media, control feed moisture, replace worn liners, adjust feed size
3.4 Motor Overload
- Cause: Excessive feed rate, high material hardness, mechanical binding
- Solution: Reduce feed rate, check material characteristics, inspect for mechanical issues
- If simple adjustments do not resolve the issue, stop the mill immediately, report to equipment management, and have professional maintenance personnel inspect
3.5 Material Leakage
- Cause: Damaged seals, worn liners with gaps, loose bolts
- Solution: Replace seals, tighten or replace liners, check all fasteners
4. Electrical and Control System Maintenance
- Check motor bearing temperature and lubrication
- Inspect electrical wiring and connections for tightness and insulation integrity
- Test motor protection devices including overload relays
- Verify PLC program and control system parameters
- Clean electrical cabinets to prevent dust accumulation
5. Maintenance Responsibility System
- Establish clear maintenance responsibility assignments for each position
- Define specific duties and work requirements
- Implement a responsibility system for regular inspection, maintenance, and repair
- Document all maintenance activities thoroughly
- Review maintenance records regularly to identify trends
6. Professional Maintenance Requirements
Complex faults or situations where simple corrective actions are ineffective require immediate shutdown. Report to the equipment management department and have professional maintenance personnel conduct thorough inspection and repair. Never attempt major repairs without proper training and authorization.
