CONNECTING DEVICE IN ROTATING FORCE TRANSFERRING PART

PROBLEM TO BE SOLVED: To provide a connecting device in a rotating transferring part, in which the exchanging time of an impeller in a mechanical stirring type desulfurizing device of a molten iron pretreating equipment can drastically be shortened. SOLUTION: Flange joints 5, 3 are integrally arranged respectively at the lower end of a rotation-driving shaft 4 and the upper end of an impeller shaft 1 and plural bolt holes consecutively penetrated on the upper and the lower flange joints 5, 3 are bored at an interval in the circumferential direction and linearly faced upper and the lower one pair of recessed grooves 6, 7 are formed at the positions corresponding to the connecting surfaces of the flange joints 5, 3. A bolt 10 is inserted in the each bolt hole and nuts 17, 18 are screwed onto a screw end part 16a, and a cotter 8 provided with an engaging part 9 engaged with the outer peripheral surfaces of the flange joints 5, 3 at one end part is inserted before fastening the nuts, so as to bridge the faced recessed grooves 6, 7, and also, an opening 8a penetrated in the upper and lower direction is arranged at the other end part of the cotter 8, and a cotter 10 for stopping get-out and inserted in the opening 8a is constituted so as to be engaged with the outer peripheral surfaces of the flange joints 5, 3.