The reasons for the large vibration of the grinding mill fan and its solutions
Source:cronus
Posted:2025-12-05 16:28:39
During the operation of the grinding mill, the fan is a crucial component, undertaking key tasks such as material conveying and system ventilation. However, when the fan experiences excessive vibration, it not only affects the working efficiency of the grinding mill but may also lead to equipment damage and even cause safety accidents. Understanding the reasons for the large vibration of the fan and taking effective solutions is the key to ensuring the stable operation of the grinding mill.
One common cause of large vibration in a fan is an unbalanced impeller. During long-term operation, the impeller may experience uneven mass distribution due to factors such as wear, corrosion, and dust accumulation. For instance, a large amount of material dust adheres to the surface of the impeller blades, causing the originally balanced impeller to lose its balance. When rotating at high speed, it generates centrifugal force, thereby triggering severe vibration. To address this issue, the solution is to regularly clean the impeller to remove the accumulated dust and attachments on its surface. If the impeller is severely worn or corroded, it needs to be repaired or replaced. Before installation, a dynamic balance test should be conducted to ensure the balance accuracy of the impeller.
The damage of the fan's bearings is also an important factor causing excessive vibration. Bearings bear huge loads during the operation of the fan. Long-term friction and wear will cause the accuracy of the bearings to decline and the clearance to increase. When the bearings experience fatigue pitting, ball fragmentation and other conditions, abnormal vibration will occur during the operation of the fan. At this point, it is necessary to inspect the bearings in a timely manner. If any damage to the bearings is found, new ones should be replaced immediately. When replacing bearings, it is important to select the appropriate model and precision grade, and install them correctly to ensure the fit accuracy between the bearing and the shaft as well as the bearing housing.
In addition, an unstable foundation or improper installation of the fan can also cause vibration. If the concrete pouring quality of the fan foundation is poor, with problems such as loosening and cracking, or if the fan is not installed strictly in accordance with the installation specifications, resulting in a loose connection between the fan and the foundation, it will cause the fan to vibrate during operation. To solve such problems, it is necessary to inspect and reinforce the fan foundation, and repair the loose and cracked parts. When reinstalling the fan, ensure that the fan is installed horizontally, the anchor bolts are tightened and reliable, and a good connection between the fan and the foundation is guaranteed.
Abnormal operating parameters of the fan, such as excessively high rotational speed or excessive air volume, may also lead to significant vibration. When a fan operates under conditions exceeding its rated parameters, the internal airflow state will change, generating unstable aerodynamic forces and thereby causing vibration. Therefore, when using the grinding mill fan, it is necessary to strictly follow the operating procedures and rated parameters of the equipment to avoid overloading the fan. Once abnormal operating parameters are detected, they should be adjusted in a timely manner to restore the fan to a normal operating state.
