What is the balance correction of the coupling?

Published: 2019-12-25

Due to various reasons, the center of mass or the main shaft does not coincide with the rotation axis, and the unbalance of centrifugal inertia force, centrifugal inertia force and dynamic deflection (vibration mode) during operation, that is, the unbalance of the rotor.This kind of imbalance will inevitably cause shaft vibration, thereby affecting the normal operation and service life of the machine, so it needs to arouse people's attention.

The degree of unbalance U is usually expressed by the product MR of the rotor mass m and the distance of the rotor from the center of mass to the axis of rotation, which is called the product of mass diameter.

It is also expressed by the product of the mass per unit mass and the diameter, which is called eccentricity e (not eccentricity in the geometric sense).The mass diameter product MR is a relative quantity related to the mass of the rotor, and the eccentricity e is a quantity that has nothing to do with the mass of the rotor.The former is intuitive and is often used for balancing operations of a given rotor, while the latter is used to measure the balance of the rotor or check the balance accuracy.Evaluate the balance grade standard of the coupling according to e.For a flexible rotor, the mode shape is eccentric (n-th mode) en=un/Mn, and Un and Mn are the n-th mode and the mass of the first mode, respectively.

In order to correct or reduceCouplingIf the unbalance is unbalanced, the appropriate balance level should be selected according to the needs. After the product is manufactured and installed on the machine, the balance (correction) plane specified by the coupling should be increased or reduced to meet the requirements of the balance level.This process is called balance correction, or balance for short.

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