An underground mining axial flow fan must operate smoothly and quietly to ensure proper mine ventilation and worker safety.

However, if unusual noise occurs, several technical issues could be the cause. Identifying and fixing these problems quickly is essential to restore performance and reduce wear.

1. No Soundproofing Layer

If the underground mining axial flow fan lacks a soundproof layer, noise levels will rise. Adding proper soundproofing can significantly reduce this.

2. Weak Silencer Function

When the silencer becomes clogged or the silencing pads deteriorate, the fan’s noise will increase. Clean or replace the silencing materials to regain effectiveness.

3. Fan Operating in the Surge Zone

If the fan operates within the surge zone, it may vibrate or emit loud sounds. Adjust the fan’s working point to a stable operating zone.

4. Loose Components in Duct or Fan

Loose bolts or joints in the fan or ductwork can cause rattling and vibrations. Check and tighten all parts to restore secure operation.

5. Sudden Expansion or Contraction of Air Ducts

Improper duct design, such as abrupt expansion or contraction, leads to airflow turbulence and noise. Redesign the ducts according to engineering standards.

6. Internal Friction Between Moving and Static Parts

If rotating fan blades contact static parts, friction causes loud sounds and damage. Reinstall or adjust components to prevent contact.

Proper maintenance of an underground mining axial flow fan ensures low noise, efficient airflow, and a safer working environment. Always inspect, adjust, and upgrade components as needed to keep the fan running smoothly and reliably.