Analysis on the Balance Correction of the Basic Type Diaphragm Coupling without Counterbore of JMⅡ

In order to correct or greatly reduce the unbalance of the JMⅡ non-counterbore basic diaphragm coupling, the appropriate balance level should be selected according to the needs, and after the product is manufactured and installed on the machine, the JMⅡ On the designated balance (correction) plane of the counterbore basic diaphragm coupling, increase or decrease the appropriate mass to meet the balance level requirements.This process is called balance correction, or balance for short.

JMⅡ type non-counterbore basic diaphragm coupling is to install an integral plum-shaped elastic ring between the two half-JMⅡ type non-counterbore basic diaphragm couplings with the same shape. The connection of the semi-JMⅡ type basic diaphragm coupling without counterbore.It is widely used in automobiles, machinery and other industries, because the plum-shaped elastic JMⅡ non-counterbore basic diaphragm coupling only receives the squeezing force in the process of transmitting torque, and is not affected by the torque normally received by the rotating parts. It is not easy to wear during the process and the service life is greatly improved.

JMⅡ type non-counterbore basic diaphragm coupling due to various reasons makes its center of mass or inertial principal axis do not coincide with its axis of rotation. Unbalanced centrifugal inertial force, centrifugal inertial couple force and dynamic deflection (vibration shape) will be generated during operation. This phenomenon is called the unbalance of the rotor. This unbalance 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.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, while the eccentricity e is a value that has nothing to do with the mass of the rotor.的量。 The amount.The former is relatively intuitive and is often used for the balancing operation of a specific given rotor. 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 JMⅡ type non-counterbore basic diaphragm coupling is evaluated by e. .For a flexible rotor, use the mode eccentricity (the nth mode) en=Un/mn, and Un and mn are the nth mode and the first mode quality respectively.