Rotary joint for cooling rolls

A rotating joint for cooling roller is characterized in that: a mechanical sealing device6 consists of a moving ring6a, a static ring6b, a compression spring6c, a moving ring seat6d and a static ring seat6e; the moving ring6a is inlayed on the moving ring seat6d; the static ring6b, the static ring seat6e and the compression spring6c are successively arranged at the inner side of the moving ring6a and a support shaft2; the moving ring6a adopts aluminum oxide ceramic ring to replace bronze ring, the static ring6b adopts carbon-graphite ring having been immersed in phenolic and the compression spring6c adopts cylinder compression spring. Compared with the present technology, the utility model has the following advantages: the seal is more reliable, the leaking quantity is small and the service life is long.