Rotating Grading Wheel for Continuous Wet Ball Mill Discharge

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Solution Overview

Problem

Existing vertical ball mills face issues with intermittent discharging and clogging during the discharge of easily breakable, flammable, or heat-sensitive materials, leading to uneven particle sizes and inefficient screening.

Innovation Solution

A grading discharge module comprising a grading mesh plate and wheel with varying slit sizes and configurations, integrated into a continuous wet ball-milling separation device, allows for continuous milling, mixing, and grading, preventing clogging and ensuring uniform particle size distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a static screen is used for screening discharged material, then the structure is simple, but the screen may be clogged easily and discharging is intermittent

Engineering Contradiction:

Improvescreen structureVSAvoiddischarging continuity

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent transforms the static screen into a rotating grading wheel with variable slit widths. The wheel rotates to continuously discharge graded materials, preventing clogging by maintaining motion and varying the discharge aperture dynamically as different sections of the wheel pass through the discharge point.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The grading wheel is divided into multiple sections with different slit widths arranged circumferentially. Each section handles a specific particle size range, allowing simultaneous grading and discharge of multiple size fractions through a single rotating component, eliminating the need for multiple static screens.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If a vertical ball mill is used for milling easily breakable or heat-sensitive materials, then the milling effect is good, but clogging occurs during discharge

Engineering Contradiction:

Improveparticle size uniformityVSAvoiddischarge reliability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The rotating grading wheel continuously moves the discharge aperture through different positions, preventing material from stagnating and clogging at a fixed discharge point. The dynamic rotation ensures consistent flow of milled material through the classifier.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The continuous rotation of the grading wheel maintains uninterrupted classification and discharge of milled material. Material is constantly fed into the grading zone and continuously discharged through varying slit widths, eliminating intermittent stopping and starting that causes clogging.

Inventive Principle:

Principle #20Continuity of useful action

3Device complexity

If intermittent operation is used, then the ball mill structure is simple, but the discharged material has uneven particle size

Engineering Contradiction:

Improveball mill structureVSAvoidparticle size uniformity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The grading wheel rotates continuously during operation, maintaining constant classification of milled material. Material enters the grading zone and is immediately classified by the rotating slits, ensuring uniform particle size in the discharged product without requiring intermittent operation cycles.

Inventive Principle:

Principle #20Continuity of useful action

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

The solution enables continuous operation with improved milling efficiency, uniform particle size distribution, and avoids clogging, suitable for large-scale production of materials like low-temperature molten insoluble sulfur, with enhanced safety and reduced energy consumption.

Implementation Method 1

a grading discharge module, which comprises a grading mesh plate and a grading wheel, wherein the grading mesh plate is sleeved outside the grading wheel; the grading mesh plate has a cylinder structure... the cylinder wall of the grading mesh plate is provided with a plurality of first slits or holes... the cylinder wall of the grading wheel is provided with a plurality of second slits or holes

Methodology Applied

Scientific EffectMechanical screening: Filter (physical)

Implementation Method 2

the material powder in a particle size greater than the target particle size is thrown out of the grading wheel under the action of rotation of the grading wheel

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS12569857B2Grading discharge module, and continuous wet ball-milling separation device and separation method

Publication Date: 2026.03.10 CHINA PETROLEUM & CHEMICAL CORP

AI summary

A continuous wet ball-milling separation device has a cylinder, which has a feeding section, a shearing section, and a crushing section in sequence from top to bottom. The feeding section is located at the upper portion of the device, and is provided with a liquid inlet, a material inlet, and a material distributor. The shearing section is located in the middle of the device, and is internally provided with shearing blades. The crushing section is located at the lower portion of the device, and is internally provided with stirring rods and crushing balls, and a grading discharge module is provided at the bottom of the crushing section. A grading discharge module is used in the device and a continuous wet ball-milling separation method applying the device. The device implements continuous operations of material crushing and grading by means of the material distributor, wet shearing, wet crushing, and wet grading.