(1) Eliminate air drum imbalance. For a new centrifuge drum, the balance correction is performed by installing the drum on the balancing mandrel. Generally, it must be placed on the dynamic balancing machine for balance correction. When the rotating drum is installed on the actual rotating shaft, its balance accuracy will be significantly reduced, because the matching conditions and concentricity between the rotating drum and the balancing mandrel and between the rotating drum and the actual rotating shaft are different. About 60 percent of the vibration of rotating equipment is caused by the imbalance of the rotor. It is the most effective way to eliminate the vibration caused by the imbalance of the hollow drum by doing the whole motor balance on site.
(2) Vibration isolation. After adopting the elimination measures of empty drum imbalance, the vibration has been reduced, but the static force during unloading cannot be eliminated by the above method. Taking effective vibration isolation measures can achieve the purpose of reducing the vibration transmitted from the foundation. Vibration isolator is a technical means often used in equipment installation and vibration reduction of small and medium-sized rotating separation machinery. It is generally divided into two types: active vibration isolation and passive vibration isolation. According to the vibration isolation theory, the machine can be regarded as an ideal mass body. The vibration isolator is formed by a massless spring and an ideal viscous resistor in parallel, and the foundation is absolutely rigid. To produce the vibration isolation effect, the excitation frequency only needs to be greater than 2 times the natural frequency. Since there is still a large distance between the assumption and the actual situation, the higher the excitation frequency, the greater the difference between them, and it is difficult to obtain vibration reduction above 20db for single-stage vibration isolation. Even if the damping is small, the isolation effect can only stay at a certain level. In the range. Therefore, anti-analytical methods can be used for vibration isolation studies.
(3) Slow down the unevenness of the fabric and the vibration of the sudden excitation force. For the random vibration caused by uneven distribution and sudden excitation force during unloading, two measures can be taken to solve such as dynamic shock absorber and automatic balance. The dynamic shock absorber can transfer the vibration energy to the shock absorber, thereby greatly reducing the vibration of the whole machine and the foundation. However, the dynamic shock absorber cannot fundamentally eliminate the vibration source, and the periodic force on the bearing is not reduced. Automatic balancing is to set a balancing device on the drum, which can quickly feed back the vibration signal generated by uneven cloth or sudden force to the control mechanism before generating a vibration-absorbing force equal to or opposite to the unbalanced centrifugal inertial force. to eliminate the vibration source fundamentally.
