Bidirectionally-pressed extrusion barrel of banded extruder

The utility model discloses a bidirectionally-pressed extrusion barrel of a banded extruder. Wherein the extrusion cavity is internally provided with a structure, and the forming holes are distributedin the side wall of one end of the cylinder body. A module is mounted at the forming hole of the extrusion cavity in a sliding manner; the module is the same as the cross section of the extrusion cavity in shape and is coaxially and tightly combined with the cavity; the module is connected with a back pressure system capable of applying back pressure opposite to the feeding extrusion force to themodule; when the module is not subjected to extrusion force or at the beginning of the extrusion force and back pressure, the module is located between the feeding hole and the forming hole to prevent materials from entering the forming hole, and when the module further moves in the direction of the extrusion force, the forming hole is exposed on the material side. According to the utility model,the extrusion pressure in