Agitator Ball Mill Entraining Profiles
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Solution Overview
Problem
Conventional agitator ball mills have inefficiencies in grinding processes due to suboptimal entrainment of grinding bodies, leading to poor yield, high energy demand, and non-uniform particle size distribution, especially at high filling degrees and lower rotational speeds.
Innovation Solution
The agitator ball mill design features agitating discs with entraining profiles that start at a right angle to the central axis and bend backward, ending before the disc's edge, creating defined circular flows and reducing secondary vortices, allowing for higher filling degrees and lower rotational speeds while maintaining grinding quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional circular entraining profiles with large radius of curvature are used, then dispersion efficiency is increased without destruction of grinding bodies, but entrainment of grinding bodies in the inner portion of the agitating disc is unsatisfactory and secondary vortices are generated at the outer edge
Solution Approach 1:
The entraining profile is divided into two distinct sections: a first section with a large radius of curvature (0.5R to R) for gentle entrainment and dispersion, and a second section with a small radius of curvature (0.05R to 0.2R) for effective outer edge control. This segmentation allows each section to perform its specific function optimally without interfering with the other.
Solution Approach 2:
Different regions of the entraining profile are given different geometric properties suited to their local functions. The inner portion uses a large radius of curvature to gently accelerate grinding bodies without causing turbulence, while the outer portion uses a small radius of curvature to effectively control the annular gap and prevent secondary vortices.
2Quantity of substance
If the agitator ball mill operates at high filling degrees with conventional designs, then grinding capacity is increased, but energy demand increases and grinding quality deteriorates
Solution Approach 1:
The invention changes the geometric parameters of the entraining profile, specifically the radius of curvature in different sections. This parameter change allows the system to operate efficiently at high filling degrees (60-80%) with reduced energy consumption by optimizing the flow patterns and reducing turbulent losses.
3Area of stationary object
If entraining profiles continue to the disc periphery, then complete coverage is achieved, but secondary vortices are generated in the annulus between the disc and chamber wall
Solution Approach 1:
The harmful second section of the entraining profile is strategically positioned at the outer edge where it can effectively control the annular gap. By extracting and isolating this small-radius section at the periphery, it prevents secondary vortices without interfering with the primary entrainment function of the large-radius inner section.
4Manufacturing precision
If agitating discs rotate at high speed to maintain grinding quality, then particle size distribution is improved, but energy consumption increases and wear increases
Solution Approach 1:
By changing the geometric parameters of the entraining profile (radii of curvature in different sections), the system achieves efficient grinding at lower rotational speeds. The optimized geometry creates better flow patterns that maintain grinding quality without requiring high speeds, thereby reducing energy consumption and wear.
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 design enhances grinding efficiency and productivity with reduced energy demand, achieving a narrower particle size distribution and minimizing wear on discs and chamber walls.
Implementation Method 1
the grinding bodies which are accelerated outwards by the entraining profiles in their radially outer portion
Implementation Method 2
the grinding bodies which are accelerated outwards by the entraining profiles in their radially outer portion are redirected to the upstream grinding cell by the front surface of the respective agitating disc and to the downstream grinding cell by rear surface of the respective agitating disc
Data Source
AI summary
An agitator ball mill that includes agitating discs (18) on an agitating shaft drivable in a spinning direction (38), which are provided with entraining profiles (35). These entraining profiles (35) are formed by a trailing wall of a respective channel of a plurality of channels (36). In relation to the spinning direction (38) the trailing wall (39) of an inner channel section (49) runs radially straight relative to the central longitudinal axis (15) and has a length f, and has an outer bent-off channel section (41), which is bent off counter to the spinning direction (38). The outer channel sections (41) are closed radially to the outside by a peripheral portion (42) of the agitating disc (18) having a radial width e.