Air Classifier Settling Box for Laminar Graphite Separation
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Solution Overview
Problem
Existing air classifiers face challenges in consistently sorting and grading flake graphite particles due to the shape and size of these particles, which often enter as a curtain, blocking airflow and leading to defective separation, with smaller particles being misplaced with larger ones.
Innovation Solution
An air classifier with a settling box and laminar airflow, combined with a material diffuser column and vibratory receptacles, separates and sorts particles based on aerodynamic properties, using gravity and airflow to direct particles into specific receptacles for secondary separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If particles are fed as a thin stream transverse to the flowing air, then the air flow is blocked by the feed curtain, but individual particle introduction into the airflow is achieved
Solution Approach 1:
The patent applies preliminary action by introducing particles vertically into the airflow direction before they enter the main classification zone. The feed system positions particles to fall parallel to the airflow rather than transverse to it, preventing the formation of a blocking curtain and ensuring smooth integration into the air stream for accurate separation.
2Productivity
If particles fall as a curtain at operational feed rates, then feed rate is maintained, but air flow is blocked and particles are not separated during fall
Solution Approach 1:
The feed system performs preliminary action by orienting particle introduction vertically along the airflow direction before particles enter the classification zone. This prevents curtain formation that would block airflow, while maintaining operational feed rates and enabling proper aerodynamic separation.
3Manufacturing precision
If flake graphite particles are introduced into the airflow, then separation and grading is improved, but consistent sorting is difficult due to particle shape and size
Solution Approach 1:
The patent applies parameter changes by utilizing aerodynamic properties (density, surface area, drag coefficient) as the classification parameter instead of relying solely on particle size. This allows consistent sorting of flake graphite particles with varied morphology by their response to airflow forces, achieving reliable separation despite shape variations.
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
Improves the separation and grading of flake graphite particles by ensuring individual introduction into the airflow, resulting in accurate sorting and collection of particles based on size and weight.
Implementation Method 1
A fan is positioned at the outlet for generating and drawing an airflow through the settling box in a direction from the inlet to the outlet
Implementation Method 2
a material diffuser column gravity feeds particles into the airflow, wherein the airflow and gravity separates and sorts the particles
Implementation Method 3
wherein the airflow and gravity separates and sorts the particles towards one of the vibratory receptacles
Implementation Method 4
vibratory receptacles secondarily separate and sort the particles
Data Source
AI summary
An air classifier for classifying a mixture of fine and coarse particles by size or aerodynamic shape, wherein the air classifier generally comprises a settling box through which a laminar airflow passes that improves introduction of particles into the airflow and thus improves separation and grading of particles by the air classifier.