What is a cat claw structure?

Cat claw pin is mainly used in the nose and the front end of the high-pressure cylinder foundation. Its main function is not to limit the axial expansion, so that the axial stress will not be too great when it expands at high temperature, but to limit the radial position to avoid dynamic and static friction caused by the movement of the nose position. It's a pin, although it's not quite like an ordinary one. It's mainly a big problem of high temperature and high expansion of steam turbines, which must be considered. Cat's paw only plays the role of allowing axial expansion and radial dead center, and the power of radial control is great.