Vertical Ball Mill Internal Flow Conduit for Uniform Pulverization
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Solution Overview
Problem
Conventional vertical grinding mills, particularly ball mills, face the challenge of input materials not residing in the lower regions for sufficient time to achieve desired size reduction/pulverization, leading to coarser materials being prematurely included in the output slurry, which can adversely affect subsequent manufacturing processes.
Innovation Solution
A vertical grinding mill with a rotatable impeller assembly and an internal flow guide conduit system that directs input materials downward into the mixing chamber, utilizing a helically extending vane mixing blade and an impeller assembly with angled blades to ensure complete pulverization, and optionally includes a scraper blade to prevent slurry accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional vertical grinding mills are used without internal flow guides, then the structure is simple, but input materials do not reside in the lower region for sufficient time to achieve desired pulverization
Solution Approach 1:
An internal flow guide conduit is introduced as an intermediary component within the grinding mill to direct and control material flow. The conduit acts as a mediator between the material feed point and the grinding zone, ensuring materials are properly directed to the lower region where they can reside for sufficient time to achieve desired pulverization, thereby improving manufacturing precision without excessive complexity
Solution Approach 2:
The flow guide conduit extends vertically into the grinding mill, utilizing the vertical dimension to control material flow paths. By positioning the conduit to extend from the upper region down into the lower grinding zone, the invention uses spatial dimensionality to ensure materials traverse the necessary path and residence time for effective pulverization
2Productivity
If materials are ground with higher input material to solution ratios, then productivity increases, but coarser ground materials tend to flow outwardly from the grinding tank prematurely
Solution Approach 1:
The internal flow guide conduit serves as an intermediary that separates and controls the flow paths of ground materials. It prevents coarser particles from prematurely exiting by directing them through a controlled path that ensures they remain in the grinding zone long enough to achieve the desired particle size, thus maintaining manufacturing precision even at higher productivity levels
Solution Approach 2:
The flow guide conduit performs preliminary action by pre-directing materials into the lower grinding region before actual grinding occurs. This preliminary positioning ensures that even coarser materials are properly situated in the grinding zone and subjected to sufficient grinding action before exiting, preventing premature discharge of undersized particles
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 ensures more effective and uniform pulverization of input materials, preventing coarser particles from prematurely exiting the mill and improving the quality of the output slurry by ensuring materials spend sufficient time in the grinding zone.
Implementation Method 1
an impeller assembly coupled to the shaft at a position spaced below the scraper arm for rotation therewith, the impeller assembly including at least one agitator blade having a pitch orientation selected whereby the rotation of the at least one agitator blade with the shaft effects the downward movement of the materials from the first conduit portion and through the second conduit portion towards the mixing blade
Implementation Method 2
An impeller assembly is provided with a mixing or grinding blade which is positioned in a lower region of the grinding tank. When rotated, the mixing blade effects the mixing and physical abrasion of the solution and input material to form a slurry
Implementation Method 3
which then flows or is pumped from the grinding tank for further processing
Data Source
AI summary
A vertical ball mill for grinding a solid input material to form a slurry, and includes a grinding tank which defines a mixing chamber, rotatable main auger assembly having mixing blade in a lower portion of the mixing chamber and a materials flow guide. The flow conduit is provided within the grinding tank interior, and includes one or more conduit segments configured to direct input material downwardly in the grinding tank towards the lower mixing chamber and auger mixing blade. An impeller is provided within the flow conduit, with a blade configuration selected to effect the downward flow of input material through the conduit segments and outwardly therefrom adjacent to the mixing blade as the auger assembly is rotated.