Installing a mining underground axial flow fan correctly is crucial for ensuring efficient airflow, stable operation, and long service life. Improper installation can cause vibration, noise, energy loss, and safety risks. This guide provides a comprehensive, step-by-step approach for installing an axial flow fan in underground mining environments.

1. Preparation Before Installation

Thorough preparation is key to a successful axial flow fan installation. This stage ensures a smooth process without interruptions or mistakes.

1.1 Site Survey and Planning

Inspect the installation site and verify that it matches design drawings.

Confirm the fan’s designated location, including wall openings or foundation positions.

Determine airflow direction (supply or exhaust) and duct connections.

1.2 Equipment and Material Inspection

Check the fan body, motor, impeller, brackets, bolts, and vibration dampers for any transport damage.

Verify fan parameters such as airflow, pressure, power, and rotation speed against design specifications.

Prepare installation materials: angle steel, channel steel, expansion bolts, sealant, and cable conduits.

1.3 Tools and Safety Measures

Ensure all tools are ready: level, tape measure, electric drill, wrench, welding machine (if needed), and lifting equipment.

Prioritize safety: workers must wear helmets, gloves, and other protective gear, and scaffolding or platforms must be stable.

2. Foundation and Bracket Installation

The foundation and bracket form the “root” of a mining underground axial flow fan, directly affecting its stability and longevity.

2.1 Foundation Construction

For large fans, pour a concrete foundation according to design dimensions and bolt layout.

Ensure concrete reaches full strength before proceeding to fan installation.

2.2 Bracket Installation

For wall or column-mounted fans, construct a sturdy metal bracket using angle or channel steel.

Precisely mark the bracket position, drill holes, and install high-strength expansion bolts.

Level the bracket carefully and tighten all bolts after confirming horizontal and vertical alignment.

Apply corrosion protection on the bracket surface to extend service life.

3. Fan Body Positioning and Fixing

Proper alignment ensures vibration-free and low-noise operation.

3.1 Lifting and Placement

Use a hoist or suitable lifting method to place the fan body onto the bracket or foundation.

A guide person should direct the movement to prevent collisions with surrounding structures.

3.2 Alignment and Bolting

Insert vibration-damping pads between the fan base and bracket.

Use a level to adjust the fan’s shaft axis according to design requirements.

Gradually tighten bolts in a cross pattern to prevent distortion.

4. Electrical Connection

Electrical installation must follow safety regulations and be performed by a qualified electrician.

4.1 Cable Routing

Lay power cables in conduits leading to the fan motor junction box.

Secure conduits and seal all joints to prevent dust and moisture ingress.

4.2 Wiring

Disconnect the main power supply before wiring.

Connect the motor according to wiring diagrams, ensuring correct phase sequence and secure grounding.

Cover junction boxes with dustproof and waterproof lids.

5. Ducts and Protective Installations

Installing ducts and protective devices ensures smooth airflow and operational safety.

5.1 Duct or Louver Installation

Connect the fan outlet to ducts using flanges and sealant to minimize leakage.

Install rain louvers outside the fan outlet, ensuring proper airflow direction and rain prevention.

5.2 Safety Grilles

Install metal safety grilles at the fan inlet and outlet to prevent debris or personnel from contacting the rotating impeller.

6. Commissioning and Acceptance

6.1 Manual Rotation

Rotate the fan impeller manually to ensure smooth movement without obstruction.

6.2 Jog Test

Apply short-duration power to confirm motor rotation direction and correct airflow.

6.3 No-Load Test

Run the fan for at least 30 minutes under no-load.

Monitor vibration, noise, current, and bearing temperature.

6.4 Load Test and Final Acceptance

Gradually connect the fan to the ventilation system and operate under design load.

Recheck all operational parameters before completing final acceptance.

Conclusion

Installing a mining underground axial flow fan is a precise process combining mechanical, electrical, and civil engineering knowledge. Proper preparation, accurate foundation and bracket installation, careful fan positioning, safe electrical connections, and systematic commissioning ensure the fan operates efficiently, quietly, and safely for years. Following this guide guarantees a high-quality installation that maximizes airflow performance and protects your underground mining environment.