How to determine if a ball mill is clogged?

1. Abnormal sound
The operating sound is dull or becoming muffled, and the impact and cascading sounds of the steel balls are inaudible.
Severe blockage may cause an abnormal or sudden decrease in current.
2. Changes in current and pressure differential
The mill current increases (may decrease abnormally in severe blockage).
The pressure differential between the mill head and tail increases, and the inlet and outlet air pressure differential increases.
3. Abnormal temperature and ventilation
The outlet temperature decreases, and the primary air duct velocity and temperature decrease.
The system air volume decreases, which may be accompanied by an increase in the demand for cold or warm air.
4. Physical manifestations
Powder oozing from the mill inlet and outlet, or powder escaping from the hollow shaft.
When the separator is clogged, a high positive pressure may occur in the pipeline.
Emergency measures to address blockage
1. Adjust feed and ventilation
Immediately reduce or stop the feed rate to reduce material accumulation in the mill. Increase the amount of cold/warm air, reduce the amount of hot air, and increase ventilation appropriately.
2. Cleaning and Inspection
If the inlet pipe is blocked, unclog or tap the pipe.
Check the lubrication system (such as oil quality and oil pressure) and bearing condition to avoid potential malfunctions caused by blockage.
3. Operations in Case of Severe Blockage
If the above methods are ineffective, shut down the machine and thoroughly clean it to avoid equipment damage.
Suggestions for Preventing Blockages
Regularly monitor current, differential pressure, and temperature parameters and establish an early warning mechanism.
Control the feed rate to avoid overfeeding or underfeeding that can lead to material accumulation or idling.
Increase maintenance of the milling system, such as cleaning the separator and inspecting the liner bolts.