Pressurizing changeable edge thread sleeve of parallel double-screw extruder

Abstract

The invention discloses a pressurizing changeable edge thread sleeve of a parallel double-screw extruder. For 6-26 conventional double-head thread sleeve bodies or conventional single-head thread sleeve bodies of the last section extruded by an extruder, the outer diameter and the inner diameter of the thread sleeve bodies are kept unchangeable, inner diameter splines are kept unchangeable, existing universality and interchangeability of the conventional thread sleeve bodies are kept, changeable edge thread sleeve bodies are arranged, the thread edge width of each added changeable edge threadsleeve body is larger than the thread edge width of the previous changeable edge thread sleeve body by 0.3-3 mm, for the end faces of one ends of the thread sleeve bodies with the increased thread edge width, the two sides of the thread edges are chamfered by 0.15-1.5 mm, the chamfering length ranges from 3 mm to 6 mm, the chamfered thread edge width size is the same with the thread edge width size of the previous thread sleeve body, the two changeable edge thread sleeve bodies are connected together and are in step-free seamless butt joint, the thread edges of the later connected thread sleeve bodies are gradually increased, the thread edges gradually become large, the space of thread grooves is gradually reduced, materials are gradually extruded due to gradual space reduction, the pressure is gradually increased, and the material extrusion pressure is increased to 10 pa or above.

Description

technical field [0001] The invention belongs to the field of chemical machinery extruder industry Background technique [0002] Plastic has become an indispensable material for human beings, and it also reflects the level of national strength of a country. The variety of plastics has grown to tens of thousands of varieties. The extruder is a preliminary equipment for plastic manufacturing. The resin from the chemical plant is added Various formulations, after melting, mixing, vacuum and extruding granulation of the extruder, the manufactured plastic granules can be used for the next step of plastic product manufacturing. The extruder is an essential key equipment for plastic manufacturing. Single screw The extruder has good granulation effect and high extrusion pressure, but its mixing and stirring effects are not good. The parallel twin-screw extruder has good melting, mixing, stirring, exhausting and vacuum effects. , that is, the material is not full between the twin-scr...

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Problems solved by technology

[0003] There is also a cone double extruder on the market, its two screws are all tapered, the effect of producing plastic is better, and the extrusion pressure is also high, the pressure is that the tapered screw squeezes the material forward, and the space is getting bigger and bigger. The smaller the pressure, the higher the pressure will be. The two screws are processed as a whole, and the cost is high. If one part of the screw is damaged, the whole screw will be scrapped. The disassembly and assembly of the conical twin screw is more troublesome at ordinary times, and the length is limited. The screw is set very long and can be deployed forward and backward arbitrarily like a building block, so the share of cone twin extruders in the plastics industry is very low

[0004] The inner diameter of the barrel of the single screw and the outer diameter of the screw flight are the same size before and after. The designed and manufactured screw groove gradually becomes shallower, and the diameter of the screw groove changes from small to large, and the space inside the screw changes from large to small. When extruding forward, the space becomes smaller and smaller, and the pressure of the material naturally increases, but the self-cleaning rate of the single-screw channel is low, and the mixing and stirring of the material is extremely small, so single-screw extruders are rarely used , only used in processing with low material requirements

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