Hollow single screw extruder with spiral grooves in double sides

Abstract

The invention relates to a hollow single screw extruder with spiral grooves in double sides. The hollow single screw extruder comprises a motor, a transmission mechanism, a base, a radial thrust bearing pack, a machine barrel, a hollow screw, an electric heating coil, an extruder head, a hopper, a gear and a central shaft. The motor drives the hollow screw to rotate through the transmission mechanism and the gear, and the extruder head is arranged at the discharge end of the machine barrel. The hollow single screw extruder is characterized in that the hollow screw is located in the machine barrel, and the central shaft is located in the hollow screw; the hollow screw is coaxial with the machine barrel and the central shaft and can rotate relative to the machine barrel and the central shaft; the outer spiral groove is formed in the outer circular surface of the hollow screw, and the inner spiral groove is formed in an inner circular hole of the hollow screw; a first discharge outlet and a second discharge outlet of the hopper are communicated with the left end of the inner spiral groove and the left end of the outer spiral groove respectively, and the right end of the outer spiral groove and the right end of the inner spiral groove are communicated with the extruder head. According to the hollow single screw extruder provided with the hollow screw, 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, the residence time of materials in the spiral grooves is shortened, decomposition of the high molecular materials is reduced, and product quality is guaranteed; besides, the service life of the machine can be prolonged, the productivity of the machine can be improved significantly, and the heat efficiency is improved.

Description

technical field [0001] The invention relates to a novel hollow single-screw extruder with double-sided screw grooves, which is mainly used for mixing, plasticizing and extruding polymer materials, and belongs to the technical field of polymer material molding equipment. Background technique [0002] Plastic extrusion molding machine is an important equipment for processing polymers. After polymers (granules, powders, etc.) enter the barrel and screw groove space through the hopper, they move forward under the push of the screw flight. Every time the screw rotates, The material moves forward by a lead, and the material has to go through a series of processes such as plasticizing and melting in the screw groove. Its shape changes from the initial solid state to the molten state through many links such as plug flow, molten film, circulation and solid phase crushing. state, and then molded into plastic products through machine heads, molds and other equipment. [0003] Obviousl...

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Problems solved by technology

[0005] Example 1, the patent "Coaxial Multi-screw Extruder" (publication number CN1059151C) discloses an extruder with multi-screw and multi-sleeve. The extruder described in this patent has two screws, two sleeve, but its two screw rods only have screw grooves on its outer circular surface, and its inner profile has no screw grooves, while its two sleeves have no screw grooves on its inner and outer circular surfaces. Said extruder is equipped with coaxial multi-layer material cylinder and screw rod, can extrude the material of the multi-layer different composition of wrapping simultaneously, and the technology described in the present invention is quite different, and its structure is complicated

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