Before starting an underground long-distance axial flow fan, you must complete strict checks to ensure safe operation and long-term performance.

Pre-Start Inspection of Underground Long-Distance Axial Flow Fan

Lubrication: Confirm the oil type, quantity, and performance meet technical standards.

Support Systems: Start the lubrication, sealing, and cooling systems before running the underground long-distance axial flow fan.

Electrical Check: Verify wiring and power supply meet all electrical safety requirements.

Clean the Fan: Ensure no water, debris, or objects are inside the fan or ducts.

Bolt Tightness: Tighten all foundation bolts with the correct torque to avoid excess vibration.

Manual Rotation: Turn the impeller manually to confirm no blockage or rubbing.

Motor Rotation Check: Jog the motor and ensure the fan rotates in the correct direction.

Safety Guards: Inspect protective covers on rotating parts for proper installation.

Dampers: For axial fans, ensure the inlet and outlet dampers are fully open before starting.

Operator Training: Train staff and establish emergency response plans before operation.

Key Points During Startup

Monitor oil flow, temperature, and cooling water supply.

Release the brake system, if equipped.

After startup, check for unusual noise, high vibration, and abnormal current.

If testing with the system closed, slightly open the inlet damper to avoid overheating.

Watch motor current while opening dampers to prevent overload.

Operating Guidelines

Closely monitor bearing temperature and fan vibration.

Listen for abnormal sounds, such as stalling or bearing damage.

Ensure bearing temperatures stay below the alarm limit and avoid sudden changes.

Check shaft seals for leaks, overheating, or noise to maintain proper sealing.

Shutdown Procedure

Stop the underground long-distance axial flow fan at low load. Close the inlet damper.

Keep the oil station running until the shaft fully stops.

Set variable blades (if any) to the closed position before shutdown.

For corrosive gases, maintain sealing even after shutdown.

Run the fan until the casing cools below 100°C for high-temperature gases.

For long-term shutdown, apply grease to parts and rotate the shaft periodically.

Drain water from coolers and pipes to avoid freezing.

Schedule regular maintenance for the underground long-distance axial flow fan.

In conclusion, following detailed procedures is essential for safely running and maintaining an underground long-distance axial flow fan. Regular checks, correct startup, and proper shutdown help ensure efficiency and safety in underground operations.