时间：2015-06-25 18:15　作者：admin　点击： 次

Due to various reasons, the center of mass or inertial principal axis of the tire coupling does not coincide with the axis of rotation, and the phenomenon of unbalanced centrifugal inertia, centrifugal inertia couple and dynamic deflection (vibration shape) will occur during operation, which is called the phenomenon of rotor Unbalance phenomenon, this kind of unbalance phenomenon will inevitably cause the vibration of the shaft system, thereby affecting the normal operation and service life of the machine, so it must be paid attention to.
In order to correct or minimize the unbalance of the tire coupling, the appropriate balance level should be selected according to the needs, and after the product is manufactured and installed on the machine, it is on the balance (correction) plane designated by the coupling , By increasing or decreasing the appropriate quality to achieve the balance level requirements, this process is called balance correction, or balance for short.
The degree of unbalance (unbalance U) is usually expressed by the product mr of the mass m of the rotor and the distance r from the center of mass to the axis of rotation of the rotor, which is called the product of mass diameter.It is also expressed by the product of mass diameter per unit mass, called the eccentricity e (not geometrically eccentric.) The product of mass diameter mr is a relative quantity related to the mass of the rotor, and the eccentricity e is a value that has nothing to do with the mass of the rotor. Absolute quantity. The former is more intuitive and is often used for specific balancing operations of a given rotor, while the latter is used to measure the pros and cons of the rotor balance or to check the balance accuracy. The balance grade standard of the tire coupling is evaluated by e.