Active-rotation inner-spraying spray head and using method

The invention relates to the field of steel tube quenching, in particular to an active-rotation inner-spraying spray head and a using method. The spray head at least comprises a base frame and a control unit, and further comprises a slide frame, a bearing frame, a first hydraulic cylinder, a second hydraulic cylinder, a motor, a gear, a sealing ring, a spray tube and a connecting tube, wherein thebase frame is of an L-shaped structure; slide slots are separately formed in the inner bottom surface and the side wall of the base frame; the two ends of the slide frame are in sliding connection tothe inner bottom surface and the side wall of the base frame; the first hydraulic cylinder is detachably connected to the inner bottom surface of the base frame; the drive end of the first hydrauliccylinder is movably connected to one end of the bottom surface, positioned in the base frame, of the slide frame; the bearing frame is in sliding connection on the slide frame; and the second hydraulic cylinder is detachably co