Vibrating Screen with Suction for Moisture-Sensitive Material Separation
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Solution Overview
Problem
Existing methods for separating polydisperse feed materials into fine and coarse materials, such as crushed sand, face challenges with high moisture content, leading to inefficient separation and increased energy consumption, particularly in conventional screening and sifting processes.
Innovation Solution
A method involving a conveying surface with openings and a separating element that alternately compresses and stretches, combined with the use of negative pressure to create a pressure differential along the openings, allowing for improved separation of fine and coarse materials by conveying part of the feed material through the openings, reducing energy intensity and maintaining selectivity even at high moisture levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional screening or sifting is used to separate crushed sand, then separation can be achieved, but energy consumption increases and separation efficiency decreases when moisture content is too high
Solution Approach 1:
The screen surface is vibrated in the conveying direction to transport material along the screen while simultaneously allowing fines to pass through openings. This vibration mechanism enables efficient separation with reduced energy consumption compared to conventional screening methods, particularly when moisture content is high
Solution Approach 2:
A suction system creates negative pressure beneath the screen to actively draw fines through the openings. This pneumatic assistance enhances separation efficiency and reduces the energy required for material transport along the screen surface
2Reliability
If moisture content of crushed sand is too high, then sifting cannot be carried out at all, but screening requires larger screen areas and produces unclear separation
Solution Approach 1:
Vibration of the screen surface in the conveying direction prevents material from clogging the openings even when moisture content is high, maintaining reliable separation capability without requiring excessive screen area
Solution Approach 2:
The suction system creates negative pressure that actively removes fines through the openings, ensuring separation capability is maintained even when moisture content would otherwise prevent sifting entirely
3Manufacturing precision
If high moisture content material is processed by conventional screening, then separation occurs, but selectivity decreases and sand losses increase
Solution Approach 1:
The vibration mechanism transports material along the screen surface while maintaining clear separation between oversize and undersize fractions, preserving selectivity and reducing sand losses even when processing high moisture content material
Solution Approach 2:
The suction system selectively removes fines through the openings while leaving coarse material on the screen, maintaining high separation selectivity and minimizing sand losses despite high moisture content in the feed material
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 method achieves sharp separation of fine and coarse materials with reduced energy consumption and increased selectivity, even at high moisture content, and is less sensitive to moisture levels, enhancing the quality of the separation process.
Implementation Method 1
creating a pressure differential along the longitudinal axes of the openings
Implementation Method 2
an oscillating drive being provided on the frame with which the frame is made to oscillate
Implementation Method 3
the at least one separating element is alternately compressed and stretched
Data Source
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AI summary
A method for separating polydisperse feedstock (1) into at least one fine material (2) and at least one coarse material (3), according to which method feedstock (1) is placed on a conveying surface (5) of at least one separator (6), said conveying surface having openings (4), and the feedstock (1) is conveyed in a conveying direction (17) on the conveying surface (5) during simultaneously movement of same for the purposes of redistributing and breaking up the material being conveyed (1). At the same time, a portion of the feedstock (1) is conveyed through the openings (4) onto a side (12) of the at least one separator (6) opposite the conveying surface (5) and the fine material (2) obtained in this way and the coarse material (3) remaining on the conveying surface (5) are each transported onwards separately from the other. According to the invention, the conveying of a portion of the feedstock (1) through the openings (4) is supported by generation of a pressure difference along the longitudinal axes (15) of the openings (4).