Small supporting structure with deep inner cavity and ejector sleeve

The utility model relates to the technical field of injection molding processing, and discloses a small-sized supporting structure with a deep inner cavity, which is arranged in a product shell, the small-sized supporting structure with the deep inner cavity is connected with the shell, the other end of the small-sized supporting structure with the deep inner cavity extends towards the direction far away from the shell, and the small-sized supporting structure with the deep inner cavity is provided with a cylindrical inner cavity. An annular boss which protrudes in the radial direction and extends in the circumferential direction is arranged on the inner wall of the inner cavity, the annular boss is located in the inner cavity, and a cylindrical groove coaxial with the inner cavity is defined by the inner wall of the annular boss; the diameter of the groove is smaller than that of the inner cavity; the annular boss extends to the middle of the inner cavity from the shell, and the inner cavity and the groove f