Oblique Screening Element for Grinding Mill Discharge
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Solution Overview
Problem
Centrifugal grinding mills face blockages at discharge due to high velocity and larger particles, which existing designs struggle to manage effectively, leading to inefficiencies in particle size classification and product discharge.
Innovation Solution
A screening element with obliquely oriented openings is mounted at the discharge passage of the grinding mill, allowing fine particles to pass through while preventing coarse particles and grinding media from discharging, using a combination of annular plates and spacers to control opening sizes and orientations, and potentially flexible materials to facilitate particle deflection and blockage clearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If centrifugal grinding mills operate at high velocity to enhance comminution rate, then productivity is improved, but blockages at discharge occur more frequently
Solution Approach 1:
The discharge passage is segmented into multiple smaller openings rather than a single large opening. This segmentation allows fine particles to pass through while preventing coarse particles and grinding media from blocking the discharge passage, thus maintaining high productivity while reducing blockage issues
Solution Approach 2:
The openings are oriented at an oblique angle relative to the discharge direction rather than being perpendicular or parallel. This angular orientation creates a dimensional change in particle flow paths, allowing particles to pass through more easily while preventing direct impact and blockage of the openings by coarse particles
2Manufacturing precision
If opening size is reduced to prevent coarse particle discharge, then particle size classification is improved, but discharge capacity decreases
Solution Approach 1:
Multiple small openings are provided in the screening element, collectively offering sufficient discharge area for fine particles while preventing coarse particles from passing through. This segmentation achieves effective particle size classification without significantly reducing overall discharge capacity
Solution Approach 2:
The screening element is made flexible and is free to vibrate and deflect in response to particle impact. This dynamic behavior allows the openings to adapt to different particle sizes, maintaining discharge capacity while achieving effective classification of fine particles
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 configuration enhances the discharge of fine ground particles, reduces blockages, and allows for the return of coarse particles to the grinding chamber, improving the efficiency and reliability of the grinding process by optimizing particle size separation and preventing entrapment.
Implementation Method 1
Centrifugal grinding mills impart centrifugal acceleration to the mill contents as a consequence of a gyrating motion, greatly enhancing the rate of comminution
Data Source
AI summary
A screening element can be mounted at a discharge passage of a grinding mill chamber. The discharge passage is positioned in use to receive ground particles moving thereinto in a discharge direction. The screening element comprises one or more openings defined therein which are oriented such that ground particles pass therethrough in a direction that is oblique with respect to the discharge direction. The grinding mill chamber may form part of a centrifugal grinding mill.