I. Abnormal operating parameters
1. Sudden flow drop: The feed flow rate decreases significantly (by more than 20% below the design value), and the underflow or overflow discharge volume decreases significantly, possibly accompanied by abnormal fluctuations in the pressure gauge reading.
If the flow rate does not improve after adding water, prioritize troubleshooting the blockage.
2. Pressure fluctuation: A sudden increase (exceeding 15% of the design value) or a continuous decrease in the feed pressure indicates changes in fluid resistance due to blockage.
The normal pressure range is typically 0.3-0.8 MPa (refer to the equipment nameplate for details).
2. Abnormal discharge conditions
1. Abnormal underflow: The underflow discharge is intermittent, clumpy, or completely cut off, rather than the normal "umbrella-shaped" jet.
An abnormally high underflow concentration (e.g., exceeding 30%) may be due to a clogged grit nozzle or excessive feed concentration. 2. Overflow Coarseness
The overflow liquid contains an increase in solid particles (visually increased turbidity). This is because the underflow outlet is clogged, preventing fine particles from settling.
III. Abnormal Equipment Condition
1. Vibration and Noise
When a blockage occurs, abnormal noise (such as a gurgling sound) may be heard inside the cyclone, or the housing may vibrate more.
Inspection Method: Place a stethoscope close to the cyclone tube and compare the sound to normal operation.
2. Temperature Change
The blockage may cause a localized temperature increase due to frictional heating (an infrared thermometer is required for auxiliary testing).
IV. Quick Diagnosis Method
1. Sectional Inspection
Close the feed valve of the suspected clogged cyclone and observe whether the other cyclones return to normal operation.
Disassembly Inspection: Prioritize cleaning the feed inlet, grit nozzle, and overflow pipe (this requires stopping the machine).
2. Auxiliary Tools
Use an endoscope to inspect the inner wall of the cyclone tube to confirm whether there are any starch aggregates or foreign matter.
