Influence of the material reverse flow process on the regularities of pressure formation along the length of the screw surface of extruders

In the present work, the problem of describing the law of increase in the internal screw pressure of a solid material along the length of the screw surface of the extruder is posed and analytically solved, depending not only on the distributed friction forces and concentrated resistance forces of th...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2021-03, Vol.699 (1), p.12059
Main Author: Usmanov, I I
Format: Article
Language:English
Subjects:
Complexity
Design parameters
Differential calculus
Energy consumption
Extruders
Extrusion
Grinding mills
Mathematical models
Mechanical properties
Pressure
Pressure distribution
Reversed flow
Stress concentration
Structural members
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Summary:In the present work, the problem of describing the law of increase in the internal screw pressure of a solid material along the length of the screw surface of the extruder is posed and analytically solved, depending not only on the distributed friction forces and concentrated resistance forces of the counter-rotation ribs, made on the inner surface of the extruder body, but also taking into account the process of “sluicing” - backflow of material, which significantly affects the formation of the pressure field. The obtained mathematical model makes it possible to more correctly substantiate the design and technological parameters of extruders and grinders. The complexity of the movement of material in screw aggregates during its transportation, extrusion and cutting is caused not only by the complex screw shape of the channel, but also by the influence of a large number of variable technological parameters, structural elements of the mechanism, as well as many factors of a physical, mechanical and rheodynamic nature. In particular, in this study, the processes in two characteristic zones of the screw space, which are fundamentally different in physical conditions, are structured and analytically described by differential calculus methods. Based on the obtained mathematical model for the law of pressure distribution along the length of the screw surface, the design and technological characteristics of extruders can be optimized to reduce the energy consumption of materials grinding processes.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/699/1/012059