Single-screw feeding optimization method and system based on discrete element method

Abstract

The invention discloses a single-screw feeding optimization method and system based on a discrete element method, and the method comprises the steps: building an overall assembly model of a screw extruder and a material particle model, carrying out the geometric cleaning and mesh division of the overall assembly model of the screw extruder, and obtaining a finite element mesh model; setting simulation parameters of the overall assembly model of the screw extruder by using the finite element mesh model, simulating the overall assembly model of the screw extruder according to the established material particle model to obtain a simulation result, and adjusting and optimizing structural parameters of a feeding section of the screw extruder in the overall assembly model of the screw extruder. According to the invention, targeted extrusion screw structure design can be carried out aiming at different materials, the stress condition and energy change of the materials in the rotating process of the screw can be analyzed, the structure of a screw feeding section and the spatial arrangement form of a feeding system are improved, the feeding efficiency is improved, and friction, impact and vibration of the materials to a charging barrel are reduced; the screw feeding design efficiency is improved, and the screw extrusion effect and extrusion efficiency are ensured.

Description

technical field [0001] The invention belongs to the field of material transportation, and in particular relates to a single-screw feeding optimization method and system based on a discrete element method. Background technique [0002] Single-screw extruder is one of the most widely used equipment in polymer processing, that is, solid conveying, compaction, melting, shear extrusion molding through external power transmission and heat transfer of external heating elements. Different areas of the extruder have different functions. Generally, the single-screw extrusion system can be divided into three sections: feeding section, compression section and homogenization section. Among them, the screw groove in the feeding section is deep, and its function is to be responsible for preheating and compacting and conveying the plastic solid, forming a solid race to move forward, ensuring that the plastic starts to melt at the end of the feeding section. The solid conveying section play...

AI Technical Summary

Problems solved by technology

Existing design methods have great limitations in the design process of large-scale FDM screw extrusion systems, which are far from meeting engineering needs

The extrusion system of industrial-grade FDM equipment adopts a three-stage long-arm screw design. Different granular materials need to be matched with different screw structures. Especially for the printing of newly developed materials, the extrusion effect and extrusion efficiency of the screw are difficult to guarantee. Sustainability There are problems such as material blockage, accumulation, and insufficient output, which affect the normal operation of the equipment

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