Conical hollow single screw extruder

The invention relates to a conical hollow single screw extruder which comprises a motor, a transmission mechanism, a base, a radial thrust bearing pack, a machine barrel, a conical hollow screw, an electric heating coil, an extruder head, a first hopper, a second hopper, a gear and a central shaft. The motor drives the conical hollow screw to rotate through the transmission mechanism and the gear, and the extruder head is arranged at a discharge outlet of the machine barrel. The conical hollow single screw extruder is characterized in that the conical hollow screw is located in the machine barrel, and the central shaft is located in the conical hollow screw; an outer spiral groove is formed in the outer circular surface of the conical hollow screw, and an inner spiral groove is formed in an inner circular hole of the conical hollow screw; the first hopper is communicated with the left end of the outer spiral groove through the machine barrel, and the second hopper is communicated with the left end of the inner spiral groove through the machine barrel; a mixing cavity is formed in the right end of the machine barrel, the right end of the conical hollow screw is located at an inlet of the mixing cavity, and materials from the outer spiral groove and the inner spiral groove are mixed in the mixing cavity and then extruded from the extruder head. The conical hollow single screw extruder has the advantages that the structure is simple, the length of the screw can be greatly reduced, the requirement of a material extrusion molding process for the relative length of a flow channel of the screw can be met sufficiently, and the productivity and the heat efficiency of the machine can be improved significantly.