Inspection and maintenance of fans

2025-07-22

Daily inspection and maintenance of fans should include the following items:

1. Changes in the sound of the fan during operation

2. Vibration and noise of the fan bearings and motor bearings

3. Vibration of the fan (including impeller and coupling)

4. Temperature rise of various bearings (absolute temperature rise should be less than 40°C)

5. Condition of the fan belt

These items should be inspected daily and recorded. Regular inspections help familiarize oneself with the normal state of the fan, allowing for quick detection of abnormalities.

Daily maintenance includes

a. Regularly adding lubricating grease (users should strictly designatedesignated personnel to add grease regularly and quantitatively, forming a system)

b. The amount of oil added is generally 30 grams to 50 grams, with an interval of 2500 to 3000 hours (operating time). Experience from a certain A factory's re-drying workshop in Yunnan suggests using an oil gun to add oil until there is a pressure sensation, then add a few more times. Another experience from a certain B factory's re-drying workshop in Yunnan is to avoid regular oiling, open the bearing housing every three months, clean out all internal grease with diesel, and refill the grease on both sides of the bearings and the bearing chamber. Over-oiling can cause higher bearing temperatures, but this is a normal condition that will return to normal after some operating time.

Periodic maintenance of fans should be conducted once or twice a year. Preparation for periodic maintenance should be based on daily maintenance records to determine key maintenance items, and necessary spare parts and easily worn components should be prepared.

Periodic maintenance projects include

a. Inspection and replacement of the impeller. Open the fan observation hole or air inlet for cleaning, and check for cracks or excessive wear on the blades.

b. Inspection, replacement, and oiling of the fan bearings.

c. Inspection, replacement of vulnerable parts, and checking the pins and elastic sleeves of the coupling. Before starting, carefully check the concentricity of the left and right couplings with a straightedge at different positions, adjusting until completely concentric.

d. Inspection, replacement, and oiling of the motor bearings.

e. Inspection and replacement of the belt. Both pulleys must be aligned, and the belt must not be twisted. Belt tension should be moderate. When removing the belt, first reduce the center distance of the pulleys, and avoid forcibly installing or removing the belt.

Before trial operation, manually rotate the shaft to check for friction or other abnormalities. If everything is normal, power can be supplied for trial operation. During trial operation with the air inlet or outlet open, monitor the current to prevent motor overload.