Lift pumps play a crucial role in SAG (Semi-Autogenous Grinding) and Ball Mill lubrication systems, ensuring proper oil circulation to bearings, gears, and other critical components. Here’s a breakdown of their function and importance:
1. Role of Lift Pumps in Mill Lubrication Systems
– Oil Circulation: Lift pumps supply lubricating oil from the reservoir to the mill’s trunnion bearings, pinion bearings, and gear spray systems.
– Pressure Maintenance: They ensure consistent oil pressure (typically 1–3 bar) for hydrodynamic bearing lubrication.
– Filtration Support: Oil is often passed through filters and coolers before reaching critical components.
2. Key Components in the Lubrication System
– Gear Spray System: Delivers oil to the girth gear and pinion for cooling and lubrication.
– Trunnion Bearing Lubrication: High-pressure lift pumps ensure an adequate oil film to prevent metal-to-metal contact.
– Back-up Pumps: Redundant lift pumps are often installed for fail-safe operation.
3. Common Lift Pump Types Used
– Gear Pumps – Reliable for high-viscosity oils.
– Centrifugal Pumps – Used in high-flow systems.
– Piston Pumps – For high-pressure applications.
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4. Potential Issues & Solutions
| Issue | Possible Cause | Solution |
|——-|—————|———-|
| Low Oil Pressure | Clogged filters, pump wear | Inspect filters, replace worn parts |
| Pump Cavitation | Low oil level or air ingress | Check reservoir level, bleed air |
| Overheating Oil | Insufficient cooling or excessive load | Verify cooler efficiency, adjust flow |
5. Best Practices for Maintenance
– Regularly check oil levels and cleanliness.
– Monitor pump pressure and temperature trends.
– Schedule preventive maintenance (seals, bearings).
– Ensure backup power supply for critical pumps.
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