Double-ball-hinge four-point-supported convertor connecting device

The utility model relates to the field of metallurgical equipment, in particular to a double-ball-hinge four-point-supported convertor connecting device, which is used for connecting a backing ring with a convertor shell and comprises a backing ring hanger, a convertor shell hanger and backing ring trunnion supports. The backing ring hanger is connected to the bottom of the backing ring, the convertor shell hanger is connected to the side wall of the convertor shell, a long connecting rod is connected between the backing ring hanger and the convertor shell hanger, two ends of the long connecting rod are respectively in ball-hinged connection with the backing ring hanger and the convertor shell hanger to form four double-ball-hinge connecting pairs, and the backing ring trunnion supports are arranged among backing ring trunnions on two sides of a tapping hole and the convertor shell. The double-ball-hinge four-point-supported convertor connecting device can be adaptable to unequal relative thermal deformation