I. Quick Diagnosis of the Blockage Location
1. Feed Inlet Blockage
Symptom: A sudden drop in feed flow and an abnormal pressure gauge reading (e.g., a sudden drop in pressure).
Remedy: Close the feed valve and disassemble the feed inlet to clean out debris (e.g., fibers, clumped starch).
2. Underflow Outlet Blockage
Symptom: Underflow is interrupted or the discharge is lumpy, with an abnormally high overflow concentration.
Remedy: Remove the underflow flange and clean the sand trap with a soft brush or compressed air.
3. Overflow Pipe Blockage
Symptom: Reduced overflow flow and increased cyclone vibration.
Remedy: Remove the overflow pipe and inspect the center pipe for impurities.
II. Emergency Procedures
1. Backflush
Close the feed valve and backflush the underflow outlet with high-pressure water or compressed air (pressure ≤ 0.5 MPa).
This method is suitable for minor blockages and avoids equipment disassembly. 2. Disassembly and Cleaning
If flushing is ineffective, disassemble the cyclone assembly in the following order:
First, loosen the ferrule, remove the grit nozzle, and clean it;
Inspect the inner wall of the cyclone for scale and remove it with a nylon brush.
3. Preventive Maintenance
After cleaning, inspect worn parts (such as the grit nozzle). If the diameter has expanded by more than 10%, replace it.
It is recommended to flush the cyclone after each shift to prevent starch residue from solidifying.
III. Operating Precautions
Do not use force to block the cyclone: Sharp tools may damage the inner wall of the cyclone and increase wear.
Pressure Control: Maintain a stable pressure during flushing to avoid high-pressure shock that may cause seal failure.
Automated Monitoring: Install a torque sensor for real-time monitoring and provide early warning before blockage (e.g., a sudden increase in torque of 20%).
