Protection method for camera lens of RH refining furnace top gun

The invention relates to the technical field of metallurgical RH refining furnace top gun systems, and particularly discloses an RH refining furnace top gun camera lens protection method, which comprises the following steps: 1) manufacturing a camera protection sleeve, and arranging a plurality of nitrogen spray holes in the camera protection sleeve; 2) a protective sleeve lens hole in the camera protective sleeve is reduced to half of an original lens hole, and a lens of the camera is arranged in the camera protective sleeve; (3) an electric valve and a pressure sensor are installed on a nitrogen pipeline connected with the nitrogen spraying hole, and the blowing-in pressure of nitrogen is controlled; the stable operation of the camera in a high-temperature environment is met, the reaction condition in the groove can be checked in real time, the shielding gas can prevent the camera lens from splashing during oxygen blowing in the furnace, and the lens is prevented from being blocked; a camera can be protecte