Vibrated Hopper Dispensing Uniform Particulate Layers
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Solution Overview
Problem
Existing methods for dispensing particulate matter in thin layers, especially with agglomerating powders or finely grained materials, face challenges in achieving uniformity due to lumping and shearing issues, leading to non-uniform layers, increased maintenance costs, and inefficiencies in compaction and waste management.
Innovation Solution
A method and apparatus utilizing a vibrated hopper with a bottom outlet and a blade that imparts rotary vibrations to dispense particulate matter, ensuring lower shear strains and efficient compaction, with a metering system that maintains uniform particle flow and reduces waste by allowing overfilling without the need for complex lifting mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a counter rotating roller is used to deposit particulate matter, then the powder can be spread across the surface, but the powder tends to lump and cling to the roller, resulting in non-uniform layers
Solution Approach 1:
The patent applies mechanical vibration to the container holding the particulate matter through a cam mechanism. This vibration fluidizes the powder, preventing it from lumping and clinging to the dispensing surface, thereby achieving uniform layer deposition without the roller clumping problem
2Quantity of substance
If a counter rotating roller is used to deposit particulate matter, then the powder can be spread across the surface, but all parts that come in contact with the particulate matter become severely soiled, requiring frequent maintenance
Solution Approach 1:
The patent extracts the particulate matter from direct contact with the roller by using a container-based dispensing system with a cam-actuated outlet. The powder is vibrated and deposited without the roller surface becoming contaminated, significantly reducing maintenance requirements
3Manufacturing precision
If a blade imparts vibrations to compact the powder, then the powder bed can be compacted to a greater degree, but the blade must push a quantity of particulate matter ahead of itself that is sufficient to coat the entire surface, leading to waste or complex lifting mechanisms
Solution Approach 1:
The patent uses a cam mechanism to dynamically control the dispensing of particulate matter. The cam converts rotational motion into reciprocating motion that precisely controls when and how much powder is released, allowing the vibrating blade to compact only the required amount of material without excess waste
Solution Approach 2:
The cam mechanism provides periodic activation of the powder dispensing. Powder is released in controlled cycles synchronized with the blade's movement, ensuring that only the necessary amount of material is supplied for compaction without requiring complex lifting or reverse-sweep mechanisms
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 achieves a more uniform and compact particulate layer with reduced waste and maintenance needs, enabling faster and cheaper rapid prototyping by ensuring consistent particle distribution and preventing damage to preceding layers.
Implementation Method 1
A method and apparatus for dispensing fluids on to a surface to be coated, with a blade traversing along the surface, and a metering device situated in front of the blade and arranged as a container with a bottom outlet, which is vibrated
Implementation Method 2
the blade is swept across the dispensed fluid such that it imparts vibrations in the form of a rotary motion. The blade vibrates while sweeping over the surface to be coated
Data Source
AI summary
This invention relates to a method for use in dispensing fluids especially particulate matter on to a surface to be coated, comprising a blade traversing along said surface, whereby the fluid is dispensed in front of said blade on to said surface, whereafter said blade is swept across the dispensed fluid such that it imparts vibrations. The fluid (5) is fed on to said surface through the bottom outlet of a container (3) vibrated cooperatively with the blade (7).