The size of the cardan coupling as well as the number of bolts are affected, and the larger the size, the greater the axial offset that can be withheld. The rolling steel temperature of the unit is low, the rolling load becomes larger, the upper fork flange on the inner side of the universal coupling is broken, and the inspection section has fatigue crack points at the root of the keyway on the flange end face, and the rest of the fracture is a continuous crack, and obvious stress tear marks will also occur in the later stage.
Universal couplings
It has a great impact on the normal production organization, and also causes a large increase in equipment maintenance costs. The fracture of the upper flange fork frame of the universal coupling was improved from the two aspects of rolling mill load and spare parts quality; Universal coupling alignment has always been a key part of the installation and maintenance of centrifugal compressors, and low alignment has a great impact on the stability and service life of equipment operation.
Universal couplings
Before the intermediate coupling is connected and installed with the drive end, the half coupling at the tail of the rotor is prone to warping, and if no measures are taken to align it directly, the result is easy to change. The half-coupling is a spherical ball joint that is connected with the power input end and the power output end respectively, and the front hemisphere surface of the ball joint is processed with a plurality of convex arc teeth, and the inner concave arc teeth are processed in the spherical grooves at both ends of the intermediate connecting shaft.
Universal couplings
The inner cavity of the end cover is a spherical groove corresponding to the spherical surface of the rear spherical surface of the ball joint, the ball joint is movably installed in the spherical inner cavity formed by the end cover and the intermediate connection shaft through the end cover, the arc teeth on the two spherical surfaces are used to mesh each other to transmit torque, the contact stress of the stressed surface is reduced, and the end cover and the intermediate connection shaft form a well-sealed spherical inner cavity, and the lubrication effect is also relatively good.