Common Issues to Check Before Overhauling a Decanter Centrifuge

Decanter centrifuges often have some common faults, which are generally manifested as difficult startup and strong vibration during idle operation. The following is a summary of the troubleshooting problems for the decanter centrifuge machine:

Problem one: The decanter centrifuge cannot run

  • The starting current of the centrifugal dehydrator is large and the time is long, which leads to the maintenance posture of the electrical switch;

  • There are too many stored materials in the drum storage device, which causes the screw to be blocked;

  • The air pressure is too low, or the pressure controller is not working properly.

Problem two: The decanter centrifuge vibrates strongly during aviation transportation

  • During the maintenance and installation process, the drum scale is not aligned at both ends, which harms the precision of rotor dynamic balance;

  • The lubricating grease has deteriorated;

  • The bearings are invalid;

  • The inner hole of the main bearing is loosened with the shaft;

  • The common fault of the helical conveyor bearing;

  • The foot bolts of the ash discharge port are not tightened or the rigid connection of the pipe is not good;

  • The engine flange plate is loose, causing the differential to vibrate;

  • The differential is damaged (usually due to lack of oil);

  • After stopping the gas, the feeding gate valve is not tightly closed, causing material leakage in the drum and causing bias;

  • Loosening and deformation occur at the joint of the rotating parts;

  • The rotor dynamic balance of the newly replaced components is poor;

  • Serious damage to relevant components;

  • Raw materials deposited inside the shell rub against the outer drum.

Problem three: the decanter separator has a high current rating for air switch

  • The V-belt and drum (especially the main roller shaft) roll under the influence of oil stains, causing waste of frictional kinetic energy;

  • Common faults of the differential (usually caused by lack of oil), when the differential housing sub-pulley and the keyed shaft are burned.

Problem four: The bearing seat temperature of the decanter centrifuge machine running without load exceeds 70℃ or the temperature rises more than 35℃

  • The oil is affected and loses lubrication;

  • The bearing is damaged or the clearance is too small;

  • The transmission belt is too tight, which enlarges the frictional output power of the main bearing and heats up;

  • Insufficient oil supply or engine flameout.

Problem five: The temperature of the differential of the decanter centrifuge machine is too high (exceeding 85℃)

  • Insufficient diesel fuel in the differential;

  • Heavy load burden;

  • Differences in heat dissipation;

  • The differential bearings or components are damaged;

  • New differentials.

Problem six: The decanter separator is unable to discharge

  • The suspension solid concentration value is too low or too little is added;

  • The proportion of solid and liquid is too close;

  • The rotation direction of the device is reversed;

  • The differential is damaged;

  • The discharge port of the drum blocked by blockage or internal raw material accumulation;

  • The deposition of raw materials between the shell and the drum.

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