Single Screw Extrusion Sprayer for Desktop 3D Printers
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Solution Overview
Problem
Conventional 3D printers are limited by the use of filament materials, have unstable extrusion forces due to piston-like extrusion states, and lack flexibility in handling different materials, especially for desktop printers, where large-scale extruders are not suitable and screw rods are difficult to clean and replace.
Innovation Solution
A single screw extrusion sprayer with a drive mechanism connected to both a stir mechanism and an extrusion mechanism, featuring a double-shaft stepping motor, bevel gears, a heating and heat dissipating assembly, and a spline shaft system that allows for flexible material handling and easy cleaning, suitable for desktop 3D printers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large-scale extruder is used to handle granular and powder materials, then material handling capability is improved, but device size and complexity increase making it unsuitable for desktop 3D printers
Solution Approach 1:
The extruder is divided into modular components including a detachable screw rod, barrel, heating assembly, and drive mechanism. This segmentation allows the system to maintain adequate material handling capability while reducing overall size and enabling desktop application by removing unnecessary components for different material types.
Solution Approach 2:
The screw rod is designed with universal functionality to handle multiple material types (filament, granular, and powder materials) through a single standardized component. This multi-functionality eliminates the need for large-scale specialized extruders for each material type, thereby reducing device size while maintaining adaptability.
2Device complexity
If a fixed-position heat source is used in the extruder, then structural simplicity is improved, but flexibility in handling different printing materials deteriorates
Solution Approach 1:
The heating assembly is designed to be movable and adjustable along the barrel axis rather than fixed. This dynamic positioning capability allows the heat source to be optimized for different material types and processing requirements, providing flexibility while maintaining relatively simple structure through a single adjustable heating element.
3Ease of manufacture
If a conventional screw rod design is used, then manufacturing simplicity is improved, but ease of cleaning and replacement deteriorates
Solution Approach 1:
The screw rod is designed as a detachable component that can be easily separated from the barrel and other parts. This segmentation maintains manufacturing simplicity while dramatically improving ease of cleaning and replacement, as the screw rod can be quickly removed and maintained without disassembling the entire extruder.
Solution Approach 2:
The screw rod is extracted as an independent, easily removable component from the extruder system. This extraction design allows the screw rod to be quickly taken out for cleaning or replacement while keeping the rest of the extruder assembled, resolving the contradiction between manufacturing simplicity and maintenance ease.
4Device complexity
If piston-like extrusion state is used with molten and unmolten filament combination, then extrusion mechanism simplicity is improved, but extrusion force stability deteriorates
Solution Approach 1:
The system controls the thermal state parameter of the material to ensure complete melting before extrusion. By maintaining appropriate temperature parameters in the heating zone, the material achieves uniform molten state, eliminating the unstable piston-like extrusion caused by mixed molten and unmolten filament, while keeping the extrusion mechanism relatively simple.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the use of various particle materials with stable and continuous pressure, facilitating easier cleaning and replacement of components, and accommodating different printing materials through a compact and lightweight design.
Implementation Method 1
a heating and heat dissipating assembly is arranged at a lower side of the barrel
Implementation Method 2
the fan is arranged outside the heat dissipating sleeve and is fixed on the support via a fan base
Implementation Method 3
the screw rod is inserted in the barrel; the nozzle is arranged at a bottom of the barrel
Data Source
AI summary
A single screw extrusion sprayer of a 3D printer includes a drive mechanism, a stir mechanism, and an extrusion mechanism. A side of the drive mechanism is connected to the stir mechanism to drive the stir mechanism to rotate, and another side of the drive mechanism is connected to the extrusion mechanism to drive the extrusion mechanism to rotate. The extrusion mechanism is connected to the stir mechanism to deliver stirred particles to the stir mechanism. The single screw extrusion sprayer has a compact structure and a light weight, and can be used in desktop 3D printers. The particle material can be melted for 3D printing.