Multi-Deck Screening Assembly with Diverter for Four-Grade Separation
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Solution Overview
Problem
Existing triple deck screen assemblies face challenges in arranging screen decks within dimensional constraints while efficiently delivering oversized material onto stockpile conveyors, particularly in producing four different grades of product.
Innovation Solution
A multi-deck screening assembly with vertically stacked decks, each divided into sections with varying aperture sizes, and a diverter member between decks to prevent undersize material from passing through, allowing for four distinct size grades and increased screening area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a triple deck screen assembly is used to produce four different grades of product, then the screening capability is improved, but the assembly height and device complexity increase
Solution Approach 1:
The lower deck is segmented into two distinct sections: a first section with first apertures and a second section with second apertures. This segmentation allows the lower deck to perform multiple screening functions simultaneously, enabling four different grades of product from a twin deck assembly, thereby reducing the need for a triple deck configuration and reducing assembly height
Solution Approach 2:
The lower deck is designed to serve multiple functions by incorporating two different aperture sizes in different sections. The first section screens for one grade while the second section screens for another grade, making the single lower deck universal for multiple screening tasks and eliminating the need for an additional deck
2Volume of moving object
If screen decks are arranged within dimensional constraints of the chassis, then the assembly compactness is improved, but the ability to deliver oversized material onto stockpile conveyors deteriorates
Solution Approach 1:
The screen decks are arranged in a vertical stack configuration, utilizing the vertical dimension to maximize screening area within the horizontal constraints of the chassis. The side walls extend vertically to support the stacked decks, allowing compact horizontal footprint while maintaining adequate space for material discharge operations
3Productivity
If undersize material is allowed to pass through the upper deck directly to the lower deck, then the screening efficiency is improved, but the contamination of oversize material with undersize material increases
Solution Approach 1:
A diverter member is positioned between the upper and lower decks to act as an intermediary. It receives undersize material falling through the upper deck and redirects it to a designated collection point, preventing it from passing through the gap between deck sections and contaminating the oversize material discharged from the lower deck
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
Enables the production of four different size grades of product within a compact twin deck configuration, enhancing screening efficiency and area utilization for finer fractions.
Implementation Method 1
said frame being provided with vibration generating means for imparting vibration to the screen decks
Implementation Method 2
said frame being mounted on a chassis via resilient mounts
Implementation Method 3
Material of a size in excess of the size of the screening apertures of each screen deck is discharged under gravity from the lower or downstream end of the respective deck
Implementation Method 4
a plurality of screen decks, each screen deck having a plurality of grading apertures formed therethrough whereby under-sized material may pass through said apertures while over-sized material passes over
Data Source
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AI summary
A multi-deck screening assembly comprising two vertically stacked screen decks, wherein the upper deck (4) comprises a first deck section (12) having grading apertures of a first size and a second deck section (14) downstream of said first deck section (12), said second deck section (14) having grading apertures of a second size, said second size being larger than said first size, and wherein said lower deck (6) comprises a first deck section (16) having grading apertures of a third size and a second deck section (18), downstream of said first deck section (16) of the lower deck (6), said second deck section (16) of the lower deck (6) having grading apertures of a fourth size, said fourth size being larger than said third size, a gap (20) being defined between said first and second deck sections (16,18) of said lower deck (6) whereby oversize material from the first section (16) of the lower deck (6) may pass through said gap (20) to be received in a first collection region (22), at least one diverter member (24) being provided between the upper and lower decks (4,6) and located over the gap (20) between the first and second sections of the lower deck (6) whereby material from the upper deck (4) collected on the at least one diverter member (24) is passed onto the second section (18) of the lower deck (6) thereby preventing undersize material passing through the upper deck from passing directly through said gap (20).