Abstract: An extruding die structure is used for a plunger molding machine. The extruding die structure comprises an extruding die structure body detachably mounted on an extruding die mounting portion of the plunger molding machine and having an extruding die at its front end and grooves in an outer circumference for positioning and fixing the extruding die structure body to the extruding die mounting portion, keys engaging the grooves for positioning and fixing the extruding die structure body, and hydraulic cylinders as key driving means provided in the extruding die mounting portion for engaging and disengaging the keys from the grooves of the extruding die structure body. After the extruding die structure body is positioned by the positioning key, the fixing keys are engaged with the grooves to fix the extruding die structure body to the extruding die mounting portion, without requiring manual troublesome operation, shorten the time required for mounting the extruding die structure.

Abstract: A kneader includes a vessel having an upper cover, at least one mixing blade provided in the vessel for mixing or kneading a powder material supplied in the vessel, sealing means for sealing between the vessel and ends of a shaft of the mixing blade extending through the vessel, bearings for supporting the shaft of the mixing blade on both the sides, blade driving means provided at one end of the shaft of the mixing blade. Each of the sealing means is provided on a side of the vessel with at least one air purge opening through which air is caused to flow toward the shaft of the mixing blade or into an interior of the vessel to form the sealing means as an air sealing construction, thereby completely preventing the powder material to be mixed from leaking through clearances between the vessel and the shaft by jetting air from the air sealing construction into the vessel.

Abstract: A plunger molding machine includes a material cylinder having at one end an extending die for extruding a blank therethrough and pivotally movable about a pivotal axis on a side of the extending die by means of a cylinder tilting mechanism, a piston having a size engageable in the material cylinder, and a hydraulic plunger for driving the piston. The plunger molding machine comprises a blank loading device arranged in parallel with moving directions of the piston for molding. The blank loading device comprises a blank receiving platform for receiving the blank to be molded, a chuck mechanism for preventing the blank on the platform from being dislodged therefrom, a platform tilting mechanism for tilting the platform, and a platform traversing mechanism for moving the platform in translational motion onto a side of the material cylinder to bring an axis of said blank receiving platform into alignment with that of said material cylinder.