Zhuo Xuanjin Explain - Four Types of Rotor Unbalance and Correction Methods
Published:
2019-10-08 11:18
In modern machinery, the use of the rotor becomes very common, but a small part of the mechanical failure caused by the imbalance of the rotor causes the economic loss of the enterprise and the unit, and the safety hazard is hard to prevent. In solving the rotor imbalance process, we need to have a deep understanding of the rotor imbalance. Today, Zhuo Xuan Jin Xiaobian takes everyone to understand the four imbalances of the rotor.
The unbalanced types of rotors can be divided into four kinds of imbalances: static imbalance, quasi-static imbalance, even imbalance and dynamic imbalance. For different conditions of the rotor, we adopt different dynamic balance correction methods. In general, the first two use static balance correction, and the latter two use dynamic balance correction.
Static imbalance and correction method
Static imbalance is equivalent to adding an unbalanced mass m to the center plane of a balanced rotor of mass M and radius r. At this time, the new center of the rotor is located in the original center of gravity plane from the original center of gravity is e (e = mr / M called eccentricity), the new central inertia main axis and the axis of rotation are always parallel, when the rotor rotates, caused by the eccentricity The centrifugal inertial force causes the bearing to vibrate. If the rotor is balanced, it is only necessary to add an equal mass to the symmetrical position of m in the center plane, and the rotor is balanced.
Quasi-static imbalance and correction method
The quasi-static imbalance is equivalent to adding an unbalanced mass M to any plane other than the center plane, at which time the central inertia main axis intersects the axis of rotation. Balancing such a rotor also requires balancing by adding or removing a certain mass m on a particular plane.
Even imbalance and correction method
The even imbalance is equivalent to 180 degrees plus two equal weight imbalances in one plane of a balanced rotor. The central inertial spindle intersects the axis of rotation through the mass point at an angle a. To balance this rotor, it is not possible to balance with a single force, that is, it cannot be weighted or de-emphasized in one plane, but must be weighted or de-emphasized in two planes to balance the rotor.
Dynamic imbalance and correction method
The dynamic imbalance of the rotor is ubiquitous, equivalent to a combination of static and even imbalance. In the unbalanced rotor, the central inertia main shaft and the rotational axis are neither parallel nor intersect, and the imbalance of the rotor is corrected by precise inspection instruments. Generally, the phase and size of the unbalance amount are detected by a dynamic balancing machine or a dynamic balance meter, and then the weight is added or de-emphasized on the plane where the center of gravity of the rotor is located. If the plane of the center of gravity is not allowed to be de-duided, it will be selected on both sides of the plane where the center of gravity is located. Weighting or de-emphasis on the plane.
If we want to do a good job of rotor dynamic balance, we must understand the imbalance of the rotor in order to make the rotor's dynamic balance faster and more accurate.
Here I recommend Guangzhou Zhuo Xuanjin Testing Machine Factory is a high-tech enterprise integrating research, development and product sales of {balance machine, dynamic balancing machine}, professionally designing and manufacturing various types of balance machines, providing balancing machine calibration technology for various industries. And solutions.
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