Head module, large-scale container and method for manufacturing the both

A method for manufacturing a large-scale container, the large-scale container including a cylindrical body with a first end and a second end and a first head module, the method comprising the steps of:

• providing a first head having an annular opening on a first end of the first head, the first head being composed of a plurality of first petals;
• installing an assembling holder and placing the first petals of the first head onto the assembling holder;
• providing a first head cylindrical ring to the annular opening of the first head on the first end of the first head to form the first head module;
• forming the cylindrical body on a first end of the first head module based on a circumferential size of the first head cylindrical ring, wherein the first end of the first head module is connected to the first end of the cylindrical body;
• and
• assembling the first head module and the cylindrical body, the first head module being located at the first end of the cylindrical body in an axial direction of the cylindrical body,
• wherein the cross section of the first head cylindrical ring perpendicular to an axial direction is the same as the cross section of the first end of the cylindrical body perpendicular to the axial direction,
• wherein the step of providing a first head cylindrical ring includes the steps of:
• making an end surface of the annular opening of the first head be consistent with an intersection line of the first head, wherein the intersection line is between the first head cylindrical ring and the first head, and wherein the first head cylindrical ring and the first head intersect each other;
• providing a plurality of first plates;
• and
• connecting in order the plurality of first plates to the end surface of the annular opening of the first head and joining facing sides of all adjacent first plates to form the first head cylindrical ring.