Causes and Solutions of Vibration in Decanter Centrifuge

Reasons for Vibration of Decanter Centrifuge

Poor rotor dynamic balance

The main factor causing unbalanced rotor in equipment is the unsatisfactory quality and installation requirements of the rotor. Analysis of the equipment manual shows that the required deviation of rotor dynamic balance should be less than 3g. If the quality deviation of a certain area on the drum is 4g, with a diameter of 600mm and a rated speed of 2000r/min, the resulting eccentricity force is approximately 52.58kg. This means that any small mass deviation on the rotor will generate a large eccentric force after the equipment is operated, which is the root cause of the excessive vibration of the equipment.

Blockage inside the drum

Decanter centrifuges generally operate continuously, providing solid-liquid separation operations for industrial processes. After long-term operation, some media gradually accumulate on the inner wall of the spiral and drum due to the viscosity of the medium used or the filtered items, which will cause channel blockage, imbalance, and vibration problems. If the equipment operates intermittently, this situation is even more prominent. Therefore, technicians need to disassemble and clean the equipment regularly, and carry out maintenance work.

Wear and deformation inside the drum

After a long-term operation of the centrifuge, certain components will gradually show signs of wear. If wear occurs inside the drum, the rotor will exhibit an uneven mass deviation, leading to large vibration problems, as described above.

Bend and deformation of various shafts

If the shaft is bent and deformed, it will cause a large eccentric force during rotation of the rotor, leading to a large vibration problem, which is one of the main reasons for the excessive vibration of the decanter centrifuge machine. This situation can be divided into three categories: short-axis bending of the liquid-phase end of the drum, with a radial circular run-out of 0.16-0.17mm, while the standard requirement is ≤0.02mm; key shaft bending of the differential, with a maximum bending degree of over 1mm, while the standard requirement is ≤0.04mm; short-axis bending of the solid-phase end of the drum, with a radial circular run-out of 0.06-0.08mm, while the standard requirement is ≤0.02mm.

Bearing wear

Bearings are critical components supporting the operation of the equipment. If there is wear or excessive clearance between the bearings, the vibration displacement will increase, resulting in more serious vibration problems. When the bearing seat and the outer surface of the bearing are severely worn, the clearance between the bearings reaches 0.50mm, while the industry standard is 0.08-0.10mm.

Treatment Methods for Vibration of Decanter Centrifuge

Scientific investigation

Because vibration is quite common in decanter centrifuge machine and there is already an intelligent system for controlling the operation of the centrifuge, if vibration exceeds the normal range, the vibrating part needs to be observed and analyzed to identify the cause of abnormal vibration and take appropriate measures.

Targeted treatment

If the operating speed of the equipment changes or other parameters suddenly change, resulting in vibration problems, the corresponding parameters need to be controlled, and the performance of the equipment parts needs to be checked, including thermal expansion, temperature difference, etc. The rotor needs to undergo dynamic balance verification, controlling the dynamic balance quality deviation below 3g. Because the components of the equipment will wear under long-term operation and increase frictional resistance, regular lubrication is necessary. Technicians also need to regularly check the pressure and temperature of the lubricant used and adjust them if they are not within the normal range. The technician can listen directly to the sound of the equipment running. If there is metal friction noise, the equipment should be stopped immediately for inspection.

Maintenance and inspection

Enterprises need to raise their management awareness and improve the construction of rules and regulations to ensure the normal operation of the decanter centrifuge machine. Staff should first check the operation status of the centrifuge operation and management system, equipment performance changes, etc., and keep detailed records. We should strengthen real-time monitoring of the decanter centrifuge machine, establish a remote control system, and use advanced sensors and other equipment to achieve dynamic detection of equipment operation.

Safety analysis

Enterprises should also strengthen safety analysis of the decanter separator. By utilizing cloud computing and other technologies, advanced computing tools are introduced to perform virtual simulation and calculation of the operation of the decanter separator to ensure understanding of the safe operating range and the existence of unsafe factors. Technicians can assess and investigate potential safety hazards and establish emergency treatment plans.

It is common for the decanter centrifuge to vibrate during operation, but excessive vibration can cause equipment failure issues, affecting its use. Therefore, enterprise technical personnel need to clearly identify the reasons for the equipment vibration and maintain and manage it during use, eliminating relevant causes beforehand to ensure the stable operation of the decanter centrifuge.

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