The reasons for the rotten blades of the 18.5 fan are as follows:
1. The rotor is unbalanced, the rotor vibrates, etc. In severe cases, a wheel overspeed accident may even occur.
2. Engine failure. Overcurrent, etc., may burn out the motor in severe cases.
3. Blade wear. With years of fan use, blade wear will gradually increase. In order to ensure the safety of the fan in use, the blades should be replaced in time.