3-phase Horizontal Decanter Centrifuge III

Common Issues and Solutions

  • Difficulty in Centrifuge Startup
Root Cause Analysis:

A. Excessive startup current leading to electrical switch protection;

B. Residual material accumulation in the drum causing blockage of the screw filter mesh;

C. Low oil pressure or pressure relay failure.


A. Adjust time relay;

B. Utilize pressurized water for flushing, rotate the screw manually during flushing, and use manual discharging;

C. Replace or adjust pressure gauge and relay components.


  • Vibration During Operation
Root Cause Analysis and Solutions:

A. Drum misalignment during maintenance assembly, disrupting dynamic balance accuracy;

Solution: Realign markings.

B. Deteriorated lubricating oil;

Solution: Replace the oil following the instructions in the operation manual.

C. Failure of main bearings;

Solution: Replace the bearings.

D. Loosening of the inner race of the main bearings with the shaft;

Solution: Replace the bearings.

E. Hard connection of the drain outlet flange;

Solution: Use a hose for connection at the joint.

F. Damaged differential (usually caused by oil shortage);

Solution: Replace differential parts.

G. Failure to close valves after shutdown leading to material accumulation in the drum;

Solution: Rinse with clean water. In severe cases, use the differential with counterclockwise rotation to assist in discharging materials from the pulley. Materials can only be put into use after being discharged from accumulation.

H. Loose or deformed parts at the joints of rotating components;

Solution: Inspect and repair.

I. Failure to perform dynamic balancing on newly installed drum components;

Solution: Adjust or replace.

J. Severe wear of screw components;

Solution: Repair.

K. Friction between accumulated material in the casing and the outer drum;

Solution: Clean or flush regularly.


  • High Idle Current
Root Cause Analysis and Solutions:

A. Slipping of V-belts and pulleys (especially the main pulley), causing frictional energy loss (resulting in overheating of the main differential pulley and pulleys);

Solution: Remove oil stains.

B. Increased current due to differential failure (usually due to oil shortage), resulting in overheating of the differential housing, secondary pulleys, and input shaft.

Solution: Replace or repair, and promptly replace lubricating oil.


  • High Bearing Temperature
Root Cause Analysis and Solutions:

A. Deterioration of machine oil and loss of lubricating effect. Reasons include foreign objects (such as vapor, water, material liquid, etc.) entering the bearing seat; deterioration after prolonged use; poor oil quality itself.

Solution: Replace lubricating oil.

B. Bearing damage or excessive clearance;

Solution: Replace bearings.

C. Excessive belt tension increases frictional energy consumption of the main bearing, causing overheating;

Solution: Loosen the belt appropriately.

D. Insufficient or interrupted oil supply.

Solution: Check oil pressure, oil volume, and oil delivery pipelines.


  • Excessive Differential Temperature (exceeding 85°C)
Root Cause Analysis and Solutions:

A. Oil shortage in the differential;

Solution: Check and add grease to the differential.

B. Excessive load;

Solution: Adjust the load.

C. Poor heat dissipation.

Solution: Optimize the working environment temperature.

D. Damage to internal bearings or components of the differential.

Solution: Overhaul the differential.

E. New differential.

Solution: Run under light load during the running-in period.


  • Frequent Synchronization between Drum and Screw
Root Cause Analysis and Solutions:

A. Excessive feed and heavy load;

Solution: Adjust the feed quantity.

B. Jamming between the screw and the drum;

Solution: Inspect the drum and screw.

C. Differential damage;

Solution: Replace.

D. Entry of other coarse particles into the horizontal decanter centrifuge;

Solution: Inspect the filtration device.

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