Belt drive is essential for centrifugal fans, impacting their efficiency and lifespan. A standard system includes a drive motor, driving wheel, driven wheel, belt, and tensioning device. Research indicates that 70% of belt failures result from improper tension and wear, while regular maintenance can triple belt life and cut fan energy consumption by 5%-15%.

Wear type and judgment criteria

Inspection tools and methods

Visual inspection:

Inspect suspicious areas on the belt's surfaces using a strong flashlight and a 5x magnifying glass, and measure wear depth with a vernier caliper.

Non contact detection:

Infrared thermal imager detects belt temperature; alert if rise exceeds 15℃. Ultrasonic detector captures abnormal noise from belt-wheel friction; pay attention if frequency exceeds 20kHz.

Deep detection:

Belt section analysis: After sampling, observe the fracture of the core wire with a metallographic microscope. Hardness testing: Use a Shore hardness tester, and if the hardness drops by more than 15%, it needs to be replaced.

Adjusting tools and steps

Tool selection:

Spring scale: accuracy ± 2%, suitable for rapid on-site testing

Laser alignment instrument: detects axis alignment with an error of ≤ 0.1mm.

Belt tension meter: piezoelectric sensor, directly displays tension value

Adjustment process:

Step 1: Loosen the fixing bolts of the motor base and reserve adjustment space

Step 2: Use a tension meter to apply a vertical force at the belt midpoint and record the value.

Step 3: Adjust the motor position using the screw or gasket, with adjustments ≤ 0.5mm.

Step 4: Retest tension force until it is within ± 5% of the target value.

Step 5: Tighten bolts and verify alignment and tension force.

Key control points:

For every 10 ℃ change in temperature, adjust tension force by ± 3% due to thermal expansion and contraction.

After 24-48 hours of operation, the new belt requires re-tensioning.

Centrifugal fan belt drive maintenance should adhere to the "three precision principles": precision adjustment, fine inspection, and precise management. Proper tensioning, systematic wear checks, and data management can enhance transmission efficiency and reduce unplanned downtime. Maintenance strategies should be dynamically optimized according to equipment conditions, shifting from passive maintenance to active prevention.