The utility model relates to the technical field of injection molding machines, in particular to a mold closing mechanism of an
injection molding machine, which is characterized in that a
hydraulic cylinder is operated to extend, so that a movable frame drives a movable mold component and a fixed mold to be closed, and then a spiral plastic extruding
machine extrudes molten liquid into an inner cavity of the fixed mold through a feeding hole to process an injection molding part. Then the
hydraulic cylinder is operated to be shortened, so that the movable mold
assembly and the injection molding part are far away from the fixed mold, then the ejector pin
assembly ejects the injection molding part on the movable mold
assembly away from the movable mold assembly, and automatic demolding of the injection molding part is achieved; comprising a supporting frame, a fixed mold, hydraulic cylinders, a
moving frame and a feeding hole, the fixed mold is arranged at the right end of the interior of the supporting frame, the feeding hole is formed in the fixed mold, the two hydraulic cylinders are arranged at the left end of the supporting frame, and the moving ends of the two hydraulic cylinders extend into the supporting frame and are connected with the left end of the
moving frame. A movable mold assembly is arranged on the movable frame, and an ejector pin assembly is arranged on the movable mold assembly.