The universal coupling is an important component that connects the prime mover and the working machine. Its damage will cause the machine to stop and even affect the entire production line. Therefore, the requirement for its reliability is quite high.

The universal coupling is an important component that connects the prime mover and the working machine. Its damage will cause the machine to stop and even affect the entire production line. Therefore, the requirement for its reliability is quite high. However, the conditions in which universal couplings are located often have certain limitations, such as: In the drive of the rolling mill, due to the certain diameter limitations of the connected rolls, the rotational diameter of the coupling is also correspondingly restricted. The actual torque during the rolling process often approaches the fatigue torque of the coupling, and may even exceed it if not handled properly. If this overload phenomenon occurs frequently, it will greatly reduce the fatigue life, leading to premature failure or damage.

In addition, the spatial geometric position requirements for universal couplings are also relatively high. If not properly handled, additional torques will occur, which will also reduce their lifespan and affect their transmission efficiency. For large couplings, due to inadequate maintenance techniques and improper adjustment of the balance system, additional loads equivalent to the torque level or even larger may occur, and in some cases, the cross shaft may even break. Therefore, for such a core device, comprehensive technical control is necessary to ensure its lifespan.

Universal couplings have the advantages of large transmission Angle, high efficiency, smooth transmission, low noise, small clearance impact and large transmission torque. Especially under the correct technical control conditions, a very long service life can be achieved, and thus it has been increasingly adopted by various types of machinery. At present, the adoption rate of domestic rolling mills has reached about 70%, with a large rotation diameter of 1200mm and a transmission torque of 3200kN.m.