Sieving Apparatus Separating Elongated and Spherical Materials
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Solution Overview
Problem
Conventional sieving apparatuses cannot effectively separate granular materials based on differences in cross-sectional diameter and aspect ratio, limiting their ability to distinguish between spherical and non-spherical substances.
Innovation Solution
A sieving apparatus comprising a first sieving portion with elongated holes or slits and a second sieving portion with a porous plate, where the hole diameter of the porous plate is longer than the opening width of the elongated holes, allowing for separation based on cross-sectional diameter and aspect ratio, with the porous plate design preventing elongated substances from passing through unless in an erected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional sieving apparatus uses a single sieve structure, then the device complexity is low, but it cannot separate granular materials based on both cross-sectional diameter and aspect ratio
Solution Approach 1:
The sieving apparatus is divided into two distinct sieving portions: a first sieving portion with elongated holes for separating based on cross-sectional diameter, and a second sieving portion with circular holes for separating based on aspect ratio. This segmentation allows each portion to perform a specific separation function, achieving both separation criteria simultaneously while maintaining reasonable device complexity through modular design
Solution Approach 2:
The invention transitions from a single-plane sieving approach to a multi-stage sequential sieving approach. Materials first pass through the first sieving portion (elongated holes) and then through the second sieving portion (circular holes), adding a dimensional aspect of sequential processing that enables both cross-sectional diameter and aspect ratio separation
2Reliability
If the second sieving portion uses a mesh made by weaving linear members, then the structural strength is high, but the surface roughness causes elongated substances to be inclined and easily pass through the holes
Solution Approach 1:
The second sieving portion uses a porous plate with circular holes instead of a traditional woven mesh. This porous plate provides a flat, smooth surface that prevents elongated substances from being inclined by surface roughness, while the circular hole configuration maintains the required structural strength and provides effective aspect ratio-based separation
3Manufacturing precision
If the hole diameter of the porous plate is shorter than the opening width of the elongated holes, then the separation precision for cross-sectional diameter is improved, but the ability to separate based on aspect ratio is reduced
Solution Approach 1:
The invention applies different hole geometries to different sieving portions according to the specific separation requirements: the first sieving portion uses elongated holes optimized for cross-sectional diameter separation, while the second sieving portion uses circular holes optimized for aspect ratio separation. Each portion has locally optimized geometry for its specific function, achieving overall versatility
Data Source
AI summary
A sieving apparatus includes first and second sieving portions. The first sieving portion includes a sieve with a plurality of elongated holes or slits for separation of an object to be sieved based on difference in cross-sectional diameter. The second sieving portion with a sieve constituted by a porous plate includes round holes for separation of the object that has passed through the elongated holes or slits based on difference in aspect ratio. The second sieving portion is employed after sieving by the first sieving portion. A diameter of the round holes in the porous plate constituting the sieve included in the second sieving portion is longer than an opening width in a shorter direction of the elongated hole or the slit of the sieve included in the first sieving portion.