Agitator Ball Mill Discs with Radial Passage Openings
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Solution Overview
Problem
In agitator ball mills, the large openings in agitating discs lead to uneven distribution of grinding bodies and material, resulting in non-uniform grinding and increased wear, especially at high throughputs and viscosities, causing damage to the grinding material.
Innovation Solution
The agitator ball mill design features small grinding material passage openings arranged close to the agitating shaft, eliminating uncontrolled passage between grinding cells and ensuring uniform distribution of grinding bodies, with power consumption remaining constant across varying throughputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large openings are formed in agitating discs for passage of grinding material and grinding bodies, then throughput is improved, but uniform distribution of grinding bodies is deteriorated
Solution Approach 1:
The agitating discs are segmented into different functional zones: a first zone with no openings for uniform grinding body distribution, and a second zone with openings for controlled material passage. This segmentation allows the system to achieve both high throughput and uniform distribution by separating the functions of material transport and grinding body containment.
2Productivity
If large openings are formed in agitating discs, then material passage between grinding cells is improved, but grinding body control is deteriorated
Solution Approach 1:
Different regions of the agitating discs are given different properties: the first zone has a closed structure to control grinding bodies, while the second zone has openings to facilitate material passage. This local differentiation allows each zone to perform its specific function optimally without interfering with the other.
3Productivity
If grinding bodies are accelerated outwardly at the surface of agitating disc, then grinding effect is improved, but distribution uniformity is deteriorated
Solution Approach 1:
The agitating disc is divided into a first zone without openings that maintains uniform grinding body distribution, and a second zone with openings that enables controlled material passage. The openings are positioned such that they do not interfere with the outward acceleration of grinding bodies at the disc surface, allowing both grinding effect and distribution uniformity to be maintained.
Data Source
AI summary
An agitator ball mill comprises agitating discs (18) on an agitating shaft, wherein two adjacent agitating discs (18) are bounding a grinding cell, respectively. The agitating discs (18) comprise grinding material passage openings (28) which are only arranged in the immediate proximity of a grinding chamber inner boundary (19), which connect adjacent grinding cells, and which have a radially outer boundary that has a distance R28 starting from the grinding chamber inner boundary (19) in the radial direction of the agitating disc (18). For the ratio of the distance R28 of the radially outer boundaries of the grinding material passage openings (28) to a radial extension R18 of the agitating discs (18), the following condition applies: 0.05·R18≤R28≤0.25·R18. Otherwise the agitating discs (18) are closed.