Hinge structure of stereotyped block for plastic extrusion forming die

The utility model discloses a hinge structure of a stereotyped block for a plastic extrusion forming die. A lower stereotyped block and an upper stereotyped block are provided with a hinge matching structure, and the hinge matching structure is arranged inside an appearance range of the lower and the upper stereotyped blocks to be close to the edge of the side surface; the hinge matching structure is that: the upper stereotyped block is provided with a raised hinge shaft structure facing towards the lower stereotyped block, the raised hinge shaft structure is a cylindrical shape, an axis of the cylinder is parallel to the side surfaces of the lower and the upper stereotyped blocks, and the lower stereotyped block is provided with a concave structure which is matched with the raised hinge shaft structure. By adopting the above technical scheme, the overall stability of the stereotyped blocks can be guaranteed during the production process of products, further stereotyping effect can be played on a parison which passes through the dry stereotyping procedure, the overall stereotyping effect of the integral stereotyped block can be reinforced, and deformation internal stress of the stereotyped block can be eliminated, so a product conforming to the quality standard can be obtained. The hinge structure is convenient to install and disassemble, can reduce the processing time and can save the processing cost.