PURPOSE: To replace a roll quickly and automatically without using an overhead traveling crane, by rotating a housing of a 3-roll axle mill, so that 3 rolls can be carried out and carried in by a rail.
CONSTITUTION: A spindle 22 of each press-down mechanism 18, 19aW19c is raised, and inner housings 5, 7 are set to a free state. Subsequently, a housing 4 in a fixed housing 2 is rotated and an angle of rotation is set to "0". A fixed device 40 is released, and a housing body 1 is moved and is fixed at a right position. By gears 9, 10, housings 5, 7 are rotated, for instance, clockwise, and 1 roll 13b among 3 rolls is positioned right under a steel pipe pass line. In this case, a rail 11 and 12 of the housings 5, 7 are matched with an external rail 30, and the roll 13b is drawn out to the outside along a rail 30 by wheels 16, 17 of cradles 14, 15. Subsequently, rolls 13a, 13c are drawn out in order by rotating the housings 5, 7. The roll can be carried in by reversing the preceding steps.
HATANAKA MASAYUKI
UEMURA AKIRA
