The rotary unit of mandrel on vertical ring rolling mill

Up to now,the mandrels of the ring rolling mill all over the world are rotated passively by the workpiece through the main rolling wheel.For the ordinary vertical mill,the ring blank is sleeved on the mandrel.The friction of the main rolling wheel has to above the rotary inertia and other resistance of ring blank and lower support.Otherwise,the main rolling wheel can't rotate the blank and would damage the surface of the blank,especially for large blank with big inner and outer eccentricity,which is the main reason of restricting the large weight and size of vertical mill.In order to solve the above problem,the mandrel rotary unit with simple structure has been designed,which turns passive rotary into active rotary and creates possibility for the large weight and size of the vertical mill.