Aluminum oxide ceramic nozzle valve for protecting smelting furnace molten steel nozzle and mounting method

The invention discloses an aluminum oxide ceramic nozzle valve for protecting a smelting furnace molten steel nozzle and a mounting method. The aluminum oxide ceramic nozzle valve comprises a valve body, a connecting base and a rotating rod, wherein the connecting base is arranged at the upper end of the valve body, and the rotating rod is arranged on the connecting base; a supporting rod is arranged at the lower end of the rotating rod, and a valve element is arranged at the lower end of the supporting rod; connecting pipes are arranged at the left end and the right end of the valve body, andmounting rods corresponding to the connecting pipes are arranged at the upper end and the lower end of the valve body; mounting grooves corresponding to the mounting rods are formed in the valve body, and the mounting rods are inserted into the mounting grooves; and transverse plates are arranged on the mounting rods, and the mounting rods penetrate through the transverse plates. When the aluminum oxide ceramic nozzle va