Laser 3D Printer Pneumatic Powder Recirculation
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Solution Overview
Problem
Laser 3D printers require manual operator intervention for emptying the collection chamber, which is hazardous due to volatile and thin powder material, and existing recirculation systems are complex, expensive, and prone to powder dispersion and friction.
Innovation Solution
A laser 3D printer with a pneumatic recirculation system that automatically collects and recirculates powder material using a dense phase pneumatic transport system, eliminating the need for manual intervention and reducing friction and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual emptying of the collection chamber is used, then the system is simple and cheap to produce, but operator safety is compromised due to powder dispersion and inhalation risks
Solution Approach 1:
The patent replaces manual mechanical emptying operations with an automated pneumatic system. A fan creates a controlled airflow that draws powder from the collection chamber through a filter and back into the working compartment, eliminating direct operator contact with the powder and automating the previously manual task.
Solution Approach 2:
The patent introduces a filter as an intermediary element between the collection chamber and the working compartment. This filter captures dispersed powder particles in the airflow, preventing them from reaching the operator while allowing the automated emptying process to continue efficiently.
2Extent of automation
If mechanical recirculation systems are used, then powder recirculation is automated, but the system becomes complex and expensive with increased friction and air gaps
Solution Approach 1:
The patent employs a pneumatic recirculation system where a fan generates airflow to transport powder through a filter and back into the working compartment. This pneumatic approach replaces complex mechanical recirculation mechanisms with a simpler airflow-based system that reduces friction and eliminates mechanical air gaps.
Solution Approach 2:
The patent extracts the recirculation function from complex mechanical systems and implements it through a simplified pneumatic flow path. By removing intermediary mechanical components and using direct airflow, the system achieves automation while reducing complexity and cost.
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 safe, automated powder management, reducing the risk of dispersion and explosion, and simplifies maintenance, while being more economical and compact compared to mechanical systems.
Implementation Method 1
A laser 3D printer (1) with a pneumatic recirculation system that automatically collects and recirculates powder material using a dense phase pneumatic transport system
Data Source
AI summary
Laser 3D printer having a compartment, which has a longitudinal axis substantially vertical with respect to a supporting plane, and is delimited by a side wall extending around the longitudinal axis; and a platform, which is engaged in a sliding manner in the compartment; a feeding assembly to feed a powder material onto the platform; and a laser printing head to sinter the powder material disposed on the platform itself; the printer having a chamber configured to collect, in use, the non-sintered powder material falling from the platform; wherein the printer has a pneumatic recirculation system configured to pneumatically transport the powdered material from the chamber to the feeding assembly.