The long-term experiments and the factors that we have encountered in after-sales service that cause high-speed centrifuge vibrations are many. The vibration of the centrifuge is one of the important signs to balance the performance of the centrifuge. Generally, vibration damping can take the two methods of active vibration reduction and passive vibration reduction. Active damping is designed to keep the operating speed of the centrifuge far from the critical speed of the rotating system (the high-speed centrifuges in the laboratory generally design the critical speed to be much lower than the operating speed). In addition, dynamic balancing must be stopped during rotor machining. Passive damping is the separation of possible vibrations from the frame and the base with various types of dampers.
In the design of the common centrifuge, the active vibration reduction and the passive vibration reduction are simultaneously applied to the high-speed centrifuge. Generally, the vibration reduction can be considered in three parts; (1) the main shaft bearing housing is designed as a flexible damping type; (2) Flexible connection between the main shaft and the motor; (3) The entire drive system is flexibly coupled to the frame.
Rubber dampers usually meet the vibration damping requirements of high speed centrifuges. Under the condition that the damper structure is fixed, the greater the rubber hardness, the higher the critical speed of the system. The damper with too low hardness cannot meet the requirements and is easily damaged.
In addition to the above three parts using the flexible damping type, the elastic joint can also be used between the rotating head and the main shaft. In addition to the vibration isolation effect, various vibration damping measures also reduce the critical speed of the rotating system, thus making the working speed Far away from the critical speed. This is why some high-speed centrifuge spindles are thick and not very long, and the entire system is still operating above the critical speed.
There are two types of shafts for laboratory high speed centrifuges. A kind of shaft is slender and has a large flexibility, so it can automatically adjust the heart. The other type of shaft is shorter and shorter, and the bending deflection of the shaft itself is small, but the layer damper still makes the operating speed of the system above the critical speed, so the system is still a flexible system. Although the same is a flexible system, the difference between the slender flexible shaft and the more rigid shaft is that the automatic centering of the elongated flexible shaft is mainly through the bending of the shaft to complete the rotation of the rotor about its center of mass. The more rigid shaft is automatically centered through the flexible relative displacement of the various components of the entire rotating system.
Based on this, we think that the slender shaft should be made of spring steel, and the shorter and thicker shaft should be more reasonable.
The diameter and length of the spindle depend on the power required by the centrifuge's rotating system and the configuration of the instrument, but primarily depends on the power request. Because the shafting structure of the laboratory high-speed centrifuge is similar. Therefore, a shaft that is thick and short and has a large sag is selected.
After the spindle is affirmed, the lack of flexibility of the rotating system can be compensated by the vibrator. Therefore, it does not make sense to say whether the spindle itself is rigid or flexible in isolation. Whether the system itself is flexible depends not only on the flexibility of the shaft itself, but also on the flexibility and means of installation of the various vibration-damping installations. Therefore, it is stern to say that in high-speed centrifuges, the concept of a flexible shaft and a rigid shaft seems to be inappropriate, but should be distinguished by a flexible rotating system.
In the design of the common centrifuge, the active vibration reduction and the passive vibration reduction are simultaneously applied to the high-speed centrifuge. Generally, the vibration reduction can be considered in three parts; (1) the main shaft bearing housing is designed as a flexible damping type; (2) Flexible connection between the main shaft and the motor; (3) The entire drive system is flexibly coupled to the frame.
Rubber dampers usually meet the vibration damping requirements of high speed centrifuges. Under the condition that the damper structure is fixed, the greater the rubber hardness, the higher the critical speed of the system. The damper with too low hardness cannot meet the requirements and is easily damaged.
In addition to the above three parts using the flexible damping type, the elastic joint can also be used between the rotating head and the main shaft. In addition to the vibration isolation effect, various vibration damping measures also reduce the critical speed of the rotating system, thus making the working speed Far away from the critical speed. This is why some high-speed centrifuge spindles are thick and not very long, and the entire system is still operating above the critical speed.
There are two types of shafts for laboratory high speed centrifuges. A kind of shaft is slender and has a large flexibility, so it can automatically adjust the heart. The other type of shaft is shorter and shorter, and the bending deflection of the shaft itself is small, but the layer damper still makes the operating speed of the system above the critical speed, so the system is still a flexible system. Although the same is a flexible system, the difference between the slender flexible shaft and the more rigid shaft is that the automatic centering of the elongated flexible shaft is mainly through the bending of the shaft to complete the rotation of the rotor about its center of mass. The more rigid shaft is automatically centered through the flexible relative displacement of the various components of the entire rotating system.
Based on this, we think that the slender shaft should be made of spring steel, and the shorter and thicker shaft should be more reasonable.
The diameter and length of the spindle depend on the power required by the centrifuge's rotating system and the configuration of the instrument, but primarily depends on the power request. Because the shafting structure of the laboratory high-speed centrifuge is similar. Therefore, a shaft that is thick and short and has a large sag is selected.
After the spindle is affirmed, the lack of flexibility of the rotating system can be compensated by the vibrator. Therefore, it does not make sense to say whether the spindle itself is rigid or flexible in isolation. Whether the system itself is flexible depends not only on the flexibility of the shaft itself, but also on the flexibility and means of installation of the various vibration-damping installations. Therefore, it is stern to say that in high-speed centrifuges, the concept of a flexible shaft and a rigid shaft seems to be inappropriate, but should be distinguished by a flexible rotating system.
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