As an important equipment in modern industrial solid-liquid separation, the decanter centrifuge is widely used in environmental protection, municipal administration, chemical industry, food, pharmaceutical industry, mining, petroleum and other industries. With its advantages of continuous operation, high separation efficiency and high degree of automation, it has become the preferred equipment for many companies to handle high-solid slurry. However, in actual applications, due to factors such as complex equipment operating environment, improper operation and maintenance, or wear and aging of components, the decanter centrifuge will inevitably have various faults, affecting normal production.
Unable to start or difficult to start
1.1 Fault phenomenon
The centrifuge does not respond after pressing the start button;
The motor starts but frequently trips or the starting current is abnormal;
Vibrates violently or there is abnormal noise during the startup process.
1.2 Cause analysis
Insufficient power supply voltage or phase loss;
Loose or damaged control circuit wiring;
The motor is burned or internally short-circuited;
Inverter parameter setting error or failure;
The spindle is stuck and the resistance is too large.
1.3 Troubleshooting method
Check the power supply line to confirm that the voltage and current are normal;
Open the electrical control box to check whether the wiring is loose;
Use a multimeter to measure whether the motor winding resistance is normal;
Check whether the motor is abnormally heated and has no odor;
Whether the drum or spiral is rotated manually is smooth.
1.4 Treatment suggestions
Repair or replace the power cord and contactor;
Replace the damaged motor or control element;
Clean up the stuck foreign matter;
Check and reset the inverter parameters.
The current is too large or the overload protection is activated during operation
2.1 Fault phenomenon
The motor operating current is much higher than the rated value;
The control system alarms and stops frequently;
The motor is overheated.
2.2 Cause analysis
The feed concentration is too high or the feed is too strong at once;
The slag discharge is blocked, making it difficult to push the screw;
The bearing is seriously worn, resulting in increased running resistance;
The gap between the screw and the drum is stuck;
The differential or reducer is faulty.
2.3 Troubleshooting method
Check whether the feed system is stable;
Check whether the slag discharge port is blocked;
Check the bearing temperature and lubrication;
Open the observation window to check whether there is scaling or stuck;
Check whether the differential output shaft makes abnormal noise or shakes.
2.4 Treatment suggestions
Adjust the feed speed and concentration;
Clean the slag discharge channel regularly;
Replace the bearing and add lubricating oil;
Remove foreign matter or replace worn parts;
Repair the differential and reducer.
The slag is too wet and not dry
3.1 Fault phenomenon
The discharged solid has a high moisture content;
The dehydration effect is poor, which makes subsequent processing difficult.
3.2 Cause analysis
The differential speed setting is unreasonable and the spiral speed is too fast;
The centrifugal force in the separation zone is insufficient;
The spiral blades or drum are seriously worn;
The material particle size is too small and the flocculation effect is poor.
3.3 Troubleshooting method
Check the current differential speed;
Check the solid content and particle size of the feed;
Check the wear degree of the spiral blades;
Check the flocculant addition system.
3.4 Treatment suggestions
Reduce the differential speed and increase the solid retention time;
Adjust the drum speed and increase the centrifugal force;
Repair or replace worn parts;
Optimize the type and dosage of flocculants.
The clear liquid is turbid and the separation effect is poor
4.1 Fault phenomenon
The effluent is turbid and has a high solid content;
The liquid phase cannot meet the discharge or reuse standards.
4.2 Cause analysis
The drum speed is too low;
The differential speed is too large, resulting in insufficient sedimentation of solids;
Incomplete flocculation;
Irrational liquid level control.
4.3 Troubleshooting method
Check the current operating parameter settings;
Observe the clarity of the effluent;
Check the coagulation effect of the feed system;
Check the overflow port liquid level setting.
4.4 Treatment suggestions
Increase the drum speed;
Adjust the differential speed to reduce the slag discharge speed;
Optimize the flocculation process;
Adjust the height of the liquid level baffle.
The machine vibrates violently and makes abnormal noise
5.1 Fault phenomenon
The vibration value is too high during operation;
Periodic or sharp noise is generated;
Parts are loose or abnormally worn.
5.2 Cause analysis
The drum or spiral is unbalanced;
Bearing is damaged;
The installation foundation is unstable;
Foreign matter exists in the rotor or internal parts;
The synchronous pulley is eccentric or the belt is worn.
5.3 Troubleshooting method
Use a vibration meter to detect the vibration value of each component;
Check the operating condition of the bearing;
Use manual turning to check whether the rotor has abnormal noise;
Check whether the foundation is firm;
Check the tension and wear of the synchronous belt.
5.4 Treatment suggestions
Dynamically balance the drum or spiral;
Replace damaged bearings;
Fix foundation bolts;
Clean up foreign matter and eliminate interference;
Replace the synchronous belt or adjust the tensioner.
