Main shaft sealing part of steel seamless gas cylinder spinning roller necking machine

The invention discloses a main shaft sealing part of a steel seamless gas cylinder spinning roller necking machine, and the sealing part comprises a sealing ring and an end cover; the sealing ring isof an annular structure, a step part is arranged on the surface of one side of the sealing ring, and a through hole along the axial direction of the sealing ring is arranged on the step; a sealing groove is formed in the surface of the other side, opposite to the step part, of the sealing ring and surrounds the sealing ring; a first baffle and a second baffle perpendicular to the bottom face of the groove are arranged on the two sides of the sealing groove. The surface where the sealing groove is located is further provided with a protruding installation part. The oil return face of the sealing groove of the sealing piece is designed to be in a sawtooth trapezoid shape, the sawtooth slope faces away from the circle center, and accumulated oil can quickly flow back to the oil collecting position along the slope fac