Powder Tank Stirring Mechanism for Free-Flowing 3D Printing Feed

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing three-dimensional object manufacturing processes using powder-based materials face challenges in maintaining a free-flowing state of the powder, leading to compaction and agglomeration, which affects the consistency and quality of the manufacturing process.

Innovation Solution

The use of an agitator and stirring device configured to rotate within the powder flow path and tank, with projections or blades that impart a zero net axial directional force, maintaining the powder in a free-flowing state by lifting and mixing it without compacting it, combined with agitators in the supply and repository tubes to ensure continuous flow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the powder is delivered and deposited continuously in the manufacturing process, then productivity is improved, but the powder tends to compact and agglomerate, worsening manufacturing precision

Engineering Contradiction:

Improvecontinuous powder deliveryVSAvoidpowder flow consistency

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The agitator introduces dynamic motion to the powder system through rotating projections that periodically disturb and redistribute the powder particles. This dynamic action prevents static compaction while maintaining continuous flow, resolving the contradiction between continuous delivery and flow consistency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The rotating projections of the agitator create mechanical vibrations and disturbances in the powder bed that prevent particles from settling into compacted states. This vibration mechanism maintains powder fluidity during continuous delivery operations.

Inventive Principle:

Principle #18Mechanical vibration

2Productivity

If a traditional auger or screw conveyor is used to deliver powder, then productivity is improved through continuous transport, but the powder becomes compacted and agglomerated, worsening ease of operation

Engineering Contradiction:

Improvepowder transport efficiencyVSAvoidpowder flowability

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

Instead of using a traditional auger that pushes powder forward (which causes compaction), the invention inverts the approach by using rotating projections that lift and drop powder particles, allowing them to flow freely under gravity while being transported. This inverted mechanism maintains productivity without compromising flowability.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The design extracts the problematic continuous pushing action from the transport mechanism and replaces it with periodic lifting and dropping actions. The agitator projections take out the compaction effect by avoiding continuous contact and pressure on the powder particles.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If the powder is stored in a repository tube for continuous supply, then productivity is improved through ready availability, but the powder compacts over time, worsening reliability

Engineering Contradiction:

Improvecontinuous powder supplyVSAvoidpowder flow consistency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The agitator ensures continuous useful action by constantly moving and redistributing the powder in the repository tube. This continuous agitation prevents the powder from settling into compacted states over time, maintaining reliability of supply while supporting continuous productivity.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The agitator performs preliminary action by continuously preparing the powder for flow before it is needed. By maintaining the powder in a loose, flowable state in advance, the system ensures reliable delivery when required without compromising productivity.

Inventive Principle:

Principle #10Preliminary action

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

The solution effectively maintains the powder in a free-flowing state, preventing compaction and agglomeration, ensuring consistent and uniform delivery to the build surface for high-quality three-dimensional object production.

Implementation Method 1

an agitator for agitating powder within a powder flow path of an apparatus for manufacturing three-dimensional objects

Methodology Applied

Scientific EffectMechanical agitation: Stirring

Data Source

PatentUS12485614B2Apparatus for the manufacture of three-dimensional objects

Publication Date: 2025.12.02 STRATASYS POWDER PROD LTD

AI summary

A stirring device for a powder tank of an apparatus for manufacturing a three-dimensional object. The stirring device is configured to rotate within the powder tank about an axis of rotation, and comprises a base plate and a strut. The strut extends from the base plate and is arranged to extend into the powder tank forming an obtuse angle with the outer edge of the base plate.