Agitator Bead Mill Grinding Disc with Structured End Faces

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Solution Overview

Problem

Conventional agitator ball mills face inefficiencies due to imbalance and insufficient activation of grinding media, leading to reduced comminution effectiveness and increased vibrations, with existing designs failing to optimize axial impact and media distribution.

Innovation Solution

The agitator ball mill features mirror-image arranged grinding disks with elevations and depressions on their end faces, forming flow channels that create alternating axial impulses and pressure differences, enhancing axial impact frequency and active surface area for improved comminution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If conventional smooth grinding disks are used, then the structure is simple and easy to manufacture, but axial impact effects are insufficient and grinding media activation is inadequate

Engineering Contradiction:

Improveaxial impact effectVSAvoidgrinding disk structure

Core Design Contradiction:

ForceVSDevice complexity

Solution Approach 1:

The grinding disk surface is segmented into multiple elevations and depressions rather than being smooth, creating distinct flow channels that direct grinding media in specific patterns to enhance axial impact

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention adds axial dimensionality to the grinding disk surface with elevations and depressions, transforming the traditional two-dimensional smooth surface into a three-dimensional structured surface that generates axial impulses

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If grinding disks with activation elements are used, then grinding media activation is improved, but imbalance and vibrations increase

Engineering Contradiction:

Improvecomminution effectivenessVSAvoidagitator balance

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The grinding disk features asymmetric elevations and depressions that create controlled imbalance for media activation while maintaining overall rotational stability through strategic positioning

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The elevations and depressions are arranged in periodic patterns around the disk circumference, creating rhythmic axial impulses that activate grinding media consistently without causing chaotic vibrations

Inventive Principle:

Principle #19Periodic action

3Force

If grinding media are strongly displaced into the separation area, then comminution intensity increases, but grinding media concentration in the grinding zone decreases

Engineering Contradiction:

Improvecomminution intensityVSAvoidgrinding media concentration

Core Design Contradiction:

ForceVSQuantity of substance

Solution Approach 1:

The elevations and depressions create localized zones of high media concentration and high impact intensity in specific areas, while maintaining adequate media concentration in other zones through controlled flow channel design

Inventive Principle:

Principle #3Local quality

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 increases the impact frequency and active surface area of grinding media, leading to more effective comminution and reduced vibrations, resulting in enhanced processing efficiency and material stress.

Implementation Method 1

The elevations of the respective end faces each form flow channels for the product flow of ground material and grinding bodies. The flow of product is directed away from the face planes of the grinding disk through the flow channels... The flow channels formed by the elevations cause alternating axial impulses on the grinding media and the formation of so-called relief and compression zones.

Methodology Applied

Scientific EffectPressure difference: Pressure Gradient

Implementation Method 2

The flow channels formed by the elevations cause alternating axial impulses on the grinding media and the formation of so-called relief and compression zones. This leads to vibrations or turbulence and thus an increased impact frequency between the grinding media.

Methodology Applied

Scientific EffectImpact force: Impact Force

Implementation Method 3

Methodology Applied

Scientific EffectVibration: Vibration

Data Source

PatentEP3050628B1Agitator bead mill and grinding disc for agitator bead mills

Publication Date: 2018.12.26 NETZSCH FEINMAHL TECHNIK GMBH

Figure 1(A)~1(D)
Figure 2(A)~3
Figure 4(A)~4(D)

AI summary

The invention relates to a stirred ball mill for processing and, in particular, comminuting material using grinding media. The stirred ball mill comprises an agitator with a rotatable axial agitator shaft and at least one grinding disc arranged substantially perpendicular to the axial agitator shaft. The grinding disc has two end faces with end face planes formed substantially orthogonal to the axial agitator shaft of the agitator. According to the invention, the grinding disc includes areas in which a first of the two end faces has first protrusions and/or first depressions relative to the first end face plane. Furthermore, the grinding disc includes areas in which a second of the two end faces has second protrusions and/or second depressions relative to the second end face plane. Flow channels for a product flow comprising the material to be ground and the grinding media are formed by the protrusions and/or depressions on each end face.The invention further relates to a grinding disc for a stirred ball mill.