Elliptical Separator Drum Agitator Mill
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Solution Overview
Problem
In agitator mills, the accumulation of grinding media on the separation system can prevent the outflow of ground material, leading to reduced efficiency and potential blockages, which can cause operational issues and wear on the separation system.
Innovation Solution
The radial distance between the inner circumferential surface of the basket and the outer circumferential surface of the sieve-like separator drum varies, creating pulsating pressure conditions that prevent grinding media deposition and facilitate their removal, achieved through an elliptical cross-section of the separator drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the radial distance between the basket and separator drum is constant, then the structure is simple and easy to manufacture, but grinding media accumulates on the separator drum causing blockages and reduced efficiency
Solution Approach 1:
The separator drum is designed with an elliptical cross-section instead of a circular one, creating an asymmetric radial distance between the basket and separator drum. This asymmetry generates pulsating pressure conditions that prevent grinding media accumulation and facilitate their discharge, resolving the contradiction between simple structure and effective discharge.
Solution Approach 2:
The radial distance between the basket and separator drum is made variable rather than constant. The elliptical cross-section causes the distance to dynamically change during rotation, creating pulsating pressure conditions that actively discharge grinding media and prevent blockages, thereby improving productivity while accepting increased structural complexity.
2Productivity
If the basket rotates at high speed to improve grinding efficiency, then particle size reduction is enhanced, but grinding media is more likely to accumulate on the separation system
Solution Approach 1:
The centrifugal force that causes grinding media to accumulate on the separator drum at high rotation speeds is converted into a beneficial effect. The elliptical cross-section design uses this centrifugal force to create pulsating pressure conditions that actively discharge grinding media from the separation system, transforming the harmful accumulation effect into a beneficial cleaning mechanism that maintains operational reliability during high-speed operation.
Solution Approach 2:
The elliptical cross-section of the separator drum creates periodic variations in radial distance as the basket rotates, generating pulsating pressure conditions. This periodic action continuously discharges grinding media from the separation system, preventing accumulation and blockages even during high-speed operation, thereby maintaining reliability while preserving high grinding efficiency.
3Manufacturing precision
If a sieve-like separator drum is used to prevent grinding media discharge, then particle size control is improved, but the separation system becomes prone to clogging
Solution Approach 1:
The separator drum employs an elliptical cross-section that creates dynamic, variable radial distance during rotation rather than a constant distance. This dynamic design generates pulsating pressure conditions that continuously clear grinding media from the separation system, preventing clogging of the sieve structure while maintaining effective particle size control through the sieve-like separation.
Solution Approach 2:
The periodic variation in radial distance caused by the elliptical cross-section creates pulsating pressure conditions that regularly clear the separation system. This periodic action prevents cumulative buildup of grinding media on the sieve structure, ensuring operational continuity while maintaining the particle size control function of the separator drum.
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 ensures effective discharge of grinding media, preventing accumulation and maintaining the efficiency of the agitator mill by creating pulsating flows that remove media from the gap between the basket and the separator drum, thus avoiding blockages and wear.
Implementation Method 1
The radial distance, relative to the agitator shaft, between the inner circumferential surface of the basket and the outer circumferential surface of the sieve-like separator drum... is not constant in the circumferential direction
Implementation Method 2
During operation of the agitator mill 1, the basket 9 rotates around the separation system 5. Due to the rotation of the basket 9, the grinding media located on the outer circumferential surface of the basket 9 are accelerated in the direction of rotation of the basket 9 and moved towards the grinding container 6 by the resulting centrifugal force.
Implementation Method 3
Due to the rotation of the basket 9, the grinding media located on the outer circumferential surface of the basket 9 are accelerated in the direction of rotation of the basket 9 and moved towards the grinding container 6 by the resulting centrifugal force.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A stirred mill with a grinding chamber containing a grinding body and a stirring shaft rotating therein around a horizontal stirring shaft axis, which carries several grinding elements, preferably in the form of grinding discs, which are non-rotatably connected to it and spaced apart from each other in the direction of the horizontal axis and which move the grinding bodies, wherein the stirring shaft has a basket on its outer circumference preferably fitted with grinding elements on its outer circumference, which overlaps the outlet carrying a sieve-like separator drum, wherein the radial distance between the inner circumferential surface of the basket and the outer circumferential surface of the sieve-like separator drum is not constant in the circumferential direction, but varies.