The main part of the conical head cone is subjected to internal pressure and a large film stress occurs at the big end. At the junction of the cone and the cylindrical part, due to the geometric discontinuity, the radius of curvature is abrupt, so that a large lateral thrust is generated at this place, causing a large edge stress, which is prone to bending, and therefore needs to be strengthened. For the big end, the axial bending stress is the main control factor and belongs to the secondary stress, so the stress intensity is controlled. For the small end, the stress state at the joint between the small end and the cylinder is mainly the average circumferential tensile stress and average. The radial compressive stress is a local film stress, so the stress intensity can be controlled, but since the local film stress may exceed the distribution range of the edge effect, the stress intensity is controlled for safety. For the big end, the thickness of the reinforcing section in any case shall not be less than the thickness of the connected cone shell, the length of the reinforcing section shall not be less than, and the length of the cylinder reinforcement section shall not be less than. For small ends, the thickness of the reinforcement section shall not be less than the thickness of the connected cone shell in any case, and the length of the cone shell reinforcement section shall not be less than, and the length of the cylinder reinforcement section shall not be less than.