Rotor dynamic balance process and method
Published:
2019-10-25 10:31
The dynamic balancing machine is a high-precision instrument that measures and corrects the imbalance of the rotor to eliminate the imbalance of the rotor, that is, the rotor balancing process, also known as the balance test. It is an important process in rotor production and processing. The following describes the balancing process and method of the dynamic balancing machine:
1, the choice of calibration surface
The operation of eliminating the rotor imbalance and balancing it is called balance correction. Balance correction is performed on the plane of the rotor shaft, and the plane to be corrected is referred to as a correction plane. The method of correcting the balance on a correction plane is called one-sided or static balance. The way of correcting on two or more correction planes is called double-sided balancing or multi-face balancing or weighing balancing.
For rotors with large initial imbalance and excessive vibration during rotation, one-sided balancing must be performed prior to dynamic balance measurement to reduce static imbalance. Sometimes due to improper selection of the corrected surface position (ie, the center of gravity is not within the selected correction plane), correcting the static balance increases the imbalance of the rotor. Therefore, the correction surface selection is made in the plane of gravity center to reduce the imbalance of the rotor. If repeated gravity is not allowed, it should normally be done on two planes on either side of the plane where the center of gravity is located.
There are static imbalances and even dynamic imbalances in rigid rotors. In order to achieve equilibrium, the imbalance can be corrected on any two correction planes perpendicular to the axis, the so-called double-sided balance. The calibration method is generally performed in the form of weighting (such as a weight) or weight removal (such as drilling). The position of the correction surface is generally determined by the structure of the rotor.
2, the verification method
The rotor imbalance is caused by the center main inertia axis and the rotating shaft not coincident. Balance correction is to improve the mass distribution of the rotor so that the central main inertia axis coincides with the rotating axis to achieve equilibrium. Commonly used calibration methods are aggravated or de-emphasized.
Through threaded connection, riveting and welding, the rotor achieves better balance and higher balance accuracy, which is convenient and safe.
Drilling, grinding, boring, milling and other methods are used to grind and reduce the weight of the rotor components and impellers of the pump, or to weigh on the coupling.
Which calibration method is used depends on the rotor structure and process requirements, as well as the geometry of the calibration plane. Typically, the rotor is designed to take into account the location of weighting or de-emphasis.
3, correction error
In the balancing process, in addition to the measurement error of the balancing machine, there is an error caused by inaccurate balance correction (including the magnitude and position of the correction amount), which is called a correction error. It can be divided into correction angle error, correction amplitude error, correction radius error and correction plane position error.
In the actual revision, most of the above four errors are comprehensive and should be considered comprehensively in the analysis. In addition, the ratio between the initial imbalance and the residual imbalance should be considered, as well as the effect of the unbalanced weight loss rate of the dynamic balancing machine.
Through the above understanding, you should have more knowledge of the balancing machine. If you have other questions, you may wish to contact us Guangzhou Zhuoxuanjin Machinery Equipment Co., Ltd.
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