Separation Screen with Non-Uniform Openings for Particle Size Control
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Solution Overview
Problem
Existing vibratory screeners require frequent changes of separation screens with uniform holes to alter particle size distribution, leading to increased production downtime and costs due to the need for multiple screens and technician involvement.
Innovation Solution
A separation apparatus with a screen featuring fixed, non-uniform openings arranged in a size-based gradient, allowing for adjustment of particle size distribution by changing the deposition location of the feed stream on the screen, and an adjustable feed placement device to direct the feed stream to specific regions of the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform-hole separation screens are used to separate particles by size, then separation effectiveness is improved, but device complexity and operational time increase due to needing multiple screens for different size distributions
Solution Approach 1:
The separation screen features non-uniform openings with varying sizes distributed across different regions of the screen surface. This local variation in opening size allows different size distributions to be achieved by directing feed to different regions, eliminating the need for multiple uniform screens while maintaining effective separation.
Solution Approach 2:
A single separation screen with non-uniform openings performs the function of multiple uniform screens would otherwise be needed. By adjusting the feed placement location on the screen, the same screen can produce different particle size distributions, making it a multi-functional device that reduces overall system complexity.
2Adaptability or versatility
If multiple uniform-hole separation screens are installed to achieve different particle size distributions, then adaptability is improved, but loss of time increases due to screen changes requiring production shutdown
Solution Approach 1:
The screen's non-uniform opening distribution allows different regions to be selected for different separation requirements. Operators can change particle size distributions by adjusting feed placement to different screen regions rather than changing screens entirely, eliminating production downtime associated with screen changes.
Solution Approach 2:
The system introduces dynamic adjustability through variable feed placement on the screen. This dynamic control mechanism allows real-time adaptation to different separation needs without physical screen changes, maintaining continuous production while achieving versatility in particle size distribution.
3Ease of manufacture
If uniform-hole separation screens are used, then manufacturing simplicity is improved, but adaptability worsens requiring frequent screen replacements
Solution Approach 1:
Rather than manufacturing multiple uniform screens with different hole sizes, a single screen is manufactured with a deliberate non-uniform opening pattern. This approach maintains manufacturing simplicity while embedding multiple separation capabilities within one screen through strategic variation of opening sizes across the screen surface.
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 solution reduces the number of screens and technicians needed, minimizes production downtime, and allows for flexible adjustment of particle size distribution without the need for frequent screen changes, thereby increasing efficiency and reducing costs.
Implementation Method 1
Larger particles unable to pass through the holes in the separation screen are removed from the centrifugal screener as a retained product stream. Smaller particles of the feed stream fall through the holes in the screen during agitation are often collected as a pass-through product stream.
Implementation Method 2
separation is achieved by vibrating a separation screen on which the feed stream has been deposited
Implementation Method 3
Currently existing centrifugal screeners use one or more circular screens to separate a feed stream into two or more product streams based on size of particles that form the feed stream.
Data Source
AI summary
A novel separation screen, a separation apparatus utilizing the separation screen, and a method for product separation are disclosed herein. The separation apparatus includes a housing defining a separation chamber having an inlet and a plurality of outlet orifices. A separation screen, which is located within the separation chamber, has a plurality of openings having fixed, non-uniform sizes. The separation apparatus also includes an adjustable feed placement device located upstream from the separation screen to direct a feed stream to a selected region of the separation screen to achieve a desired size distribution in each of the product streams.