Dual-drive multi-screw extruder

Abstract

The invention provides a dual-drive multi-screw extruder, comprising a base as well as a feeding device, a delivering device and a main plasticizing device which are sequentially arranged on the base, wherein a pressurizing and extruding device is arranged at the rear end of the main plasticizing device. The dual-drive multi-screw extruder provided by the invention not only enables plasticized materials to reach an optimal uniform degree but also enables the plasticized materials to be extruded out in a centralized pressure manner, and has the advantages of large output, low energy consumption and higher practical values.

Description

technical field [0001] The invention belongs to the technical field of plastic product processing equipment, and in particular relates to a multi-screw extruder equipped with dual drives for plasticization and pressurization. Background technique [0002] At present, most of the processing of plastic products adopts single-screw extruder, twin-screw extruder or planetary screw extruder. The above-mentioned processing equipments are suitable for different plasticizing requirements, but they all have certain defects: single-screw extruder It can only provide a certain extrusion force for material plasticization. If there are high requirements for material plasticization, it is difficult for a single screw to meet it, because the structure of single screw plasticization only changes in pitch and depth, and the material is not mixed in the screw groove. The effect of shearing force only relies on external heat to extrude and plasticize. In addition, single-screw plasticization c...

AI Technical Summary

Problems solved by technology

[0002] At present, the processing of plastic products mostly adopts single-screw extruder, twin-screw extruder or planetary screw extruder. The above-mentioned processing equipment is suitable for different plasticizing requirements of articles, but there are certain defects: single-screw extruder It can only provide a certain extrusion force for material plasticization. If there are high requirements for material plasticization, it is difficult to meet the single screw, because the structure of single screw plasticization only changes in pitch and depth, and the materials are not mixed in the screw groove. The effect of shear force depends only on external heat extrusion and plasticization. In addition, single-screw plasticization consumes a lot of energy, has low output, and often produces waste products such as black coke; twin-screw extruders are superior to single-screw extruders in many aspects. Screw extruder, but the twin-screw extruder only has one more screw than the single-screw extruder. It still has certain limitations in processing high-quality materials and large-scale production. Due to the twin-screw extruder It's just that there is a shell outside the two screws, and the materials are conveyed and extruded by the two screws. It is difficult to achieve the mixing and kneading effect. The plasticization of the materials is good and bad, and there is no continuous uniformity, which makes the production operation troublesome. The energy consumption is relatively high, and the screw and the shell are greatly worn, the maintenance cost is high, and the screw needs to be dismantled and cleaned when the machine is shut down; the planetary screw extruder is currently an extruder with an ideal plasticizing effect. (Abbreviation: three-piece set) The special performance of the operating structure enables the material to enter the plasticizing section and is driven by a main screw to engage multiple small screws (usually 7-14 small screws). The meshing and rotating internal helical gear type surface, the material can achieve a better uniformity through high-speed rolling, friction, shearing and plasticization, and it does not need to disassemble the screw for cleaning when starting up and stopping, with good self-cleaning performance, low energy consumption and high output. Large, but because it is distributed rolling and friction plasticizing for materials, it cannot produce centralized pressure extrusion for materials, so it has not been used in the plasticization of many materials that require extrusion pressure.

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