Agitator Ball Mill With Variable Outer-Stator Tool Lengths
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Solution Overview
Problem
Conventional agitator ball mills experience reduced product quality and extended processing times due to unfavorable distribution of milling elements, particularly in the lower region, leading to increased power consumption when handling easy-flowing products with low viscosities or low tack.
Innovation Solution
The design features a circular-cylindrical agitator ball mill with extended outer-stator milling tools in the lower region, forming longitudinal and circumferential rows, which improves the distribution and fluidization of milling elements, preventing congregation and enhancing comminution efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional agitator ball mills are used with uniform milling elements, then the structure is simple and easy to manufacture, but the milling elements congregate and compress by gravity in the lower region leading to reduced product quality and extended processing time
Solution Approach 1:
The outer-stator milling tools are designed with varying radial lengths: tools in the lower region (rows 4-6) have a radial length of 15-20 mm, while tools in the upper region (rows 1-3) have a radial length of 10-15 mm. This local differentiation prevents congregation of milling elements in the lower region by creating varying flow patterns, thereby improving product quality without requiring complete redesign of the entire milling chamber
Solution Approach 2:
The outer stator is divided into multiple circumferential rows (at least three rows) of milling tools, with each row containing tools of different radial lengths. This segmentation allows independent optimization of tool length in different regions to control milling element distribution, preventing compression in the lower region while maintaining effective milling throughout the chamber
2Use of energy by moving object
If milling elements are allowed to congregate in the lower region, then the device structure remains simple, but power consumption increases when handling easy-flowing products with low viscosities
Solution Approach 1:
By extending the radial length of outer-stator milling tools specifically in the lower region where congregation occurs, the design creates localized fluidization effects that reduce power consumption for easy-flowing products. The longer tools (15-20 mm) in rows 4-6 generate sufficient shear forces to prevent compression, thereby reducing the energy required to mill low-viscosity materials compared to conventional uniform designs
3Productivity
If uniform milling elements are used throughout the milling chamber, then the device is easier to manufacture, but processing time is extended due to unfavorable distribution of milling elements
Solution Approach 1:
The varying radial lengths of outer-stator milling tools (10-15 mm in upper rows, 15-20 mm in lower rows) create optimized local flow patterns that prevent milling element compression in the lower region. This improves processing efficiency and reduces processing time for easy-flowing products, while the modular row-based structure maintains relative ease of manufacture through standardized tool configurations
Solution Approach 2:
The different radial lengths of milling tools in different rows create dynamic flow patterns that adapt to the material flow, preventing stagnation and congregation in the lower region. This dynamic distribution of milling elements throughout the chamber improves productivity by ensuring continuous effective milling action without requiring complex real-time adjustments
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
This configuration reduces power consumption, improves product quality, and minimizes vibrations caused by milling element congregation, ensuring consistent milling conditions and better comminution results.
Implementation Method 1
the milling elements can congregate and compress by gravity in the lower region of the milling chamber
Implementation Method 2
an improved fluidization and distribution of the milling elements within the agitator ball mill is ensured
Data Source
AI summary
An agitator mill having a circular-cylindrical outer stator and an agitator having a circular-cylindrical rotor. The rotor is arranged within the outer stator, and a milling chamber between the rotor and the outer stator. In the milling chamber, a through-flow direction which extends from a feed channel to a discharge channel. Several rotor milling tools are attached to the rotor, wherein several outer-stator milling tools are attached to the outer stator. The outer-stator milling tools are arranged adjacent to and in the circumferential direction and form rows. These rows are arranged parallel to one another on the outer stator. On the side, facing away from the feed channel the outer-stator milling tools of at least one row have a greater radial length than the other outer-stator milling tools. The outer-stator milling tools of each row in the circumferential direction each have the same length.