What is the balance correction of the coupling?

   CouplingThe balance correction is very important, which plays a very important role in its work quality and efficiency, so do you know what is the balance correction of the coupling?CouplingDue to various reasons, the center of mass or inertial principal axis does not coincide with the axis of rotation. Unbalanced centrifugal inertial force, centrifugal inertial couple force and dynamic deflection (vibration shape) will occur during operation, which is called the unbalanced phenomenon of the rotor. 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.
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 mass-diameter product.It is also expressed by the product of mass diameter per unit mass, which is called 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. The amount of *.The former is relatively intuitive, and is often used for specific balancing operations of a 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 coupling is evaluated by e.For a flexible rotor, the mode eccentricity (the nth mode) en=Un/mn is used, and Un and mn are the nth mode and the mass of the first mode, respectively.
Couplings are mainly used to connect coaxial lines or two parallel shafts to transmit torque.In order for it to work normally, we need to check its input daily. What matters should be paid attention to during the inspection?
(1 pairCouplingThe basic requirements of inspection: the connection of the coupling must be firm, the connecting bolts and connecting keys are not allowed to loosen, the coupling radial and end beating during rotation, there should be no obvious feeling during visual observation, and when measuring with an instrument , Cannot exceed the limit.
(2) * Inspection of the gear coupling: When the gear coupling has increased transmission noise or the equipment is overhauled, it should be disassembled and inspected, focusing on the following items:
① When the coupling bolt hole is severely worn, the mechanism will jump or even cut off the bolt. Therefore, the bolt hole should be scrapped if it is severely worn and cannot be repaired.
② If the tooth thickness wear exceeds 15%-20% of the original tooth thickness, it should be scrapped.Lifting mechanism and unbalanced luffing mechanism are 15%, and other mechanisms are 20%.
③After the flat keyway is worn out, the key is easy to loosen or even fall off.You can reopen a new keyway at the position where the original keyway on the shaft has been rotated 90° or 180°, or add a pad that does not exceed 15% of the pad thickness on the key.Repair welding of the keyway is not allowed, and repairing of the keyway of the lifting mechanism is not allowed.
④ If any part of the coupling has cracks, it should be scrapped, and if there are broken teeth, it should be scrapped.
(3) Inspection of the elastic coupling: When the rubber ring or cowhide pad of the elastic pin coupling is damaged, it should be replaced in time. If the pin and hole are squeezed to produce vibration, the half body should be rotated by an angle to re-drill the hole. , Replace the standard new pin, and it is not allowed to expand the original hole with a new pin.
(4) Whether the coupling oil seal with lubrication device is intact, whether the lubricating oil is deteriorated, whether there is oil leakage or oil leakage.If the above problems occur, the seal or lubricating oil should be replaced. If the lubricating oil is lacking, it should be refilled in time.