Sieve Wall Frame Extension for Waste Separation
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Solution Overview
Problem
Material accumulation against the upright wall in waste processing systems hinders separation and operation efficiency, as it prevents materials from being discharged through sieve openings.
Innovation Solution
The system features a chamber with a wall comprising multiple sections, including a sieve section with a frame section extending into the chamber by less than 2 mm, and air guiding elements that define a tapered passage to prevent material sticking and facilitate separation, allowing for efficient discharging of materials through sieve openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If material is discharged through sieve openings in the upright wall, then separation efficiency is improved, but material accumulates against the wall and hinders further operation
Solution Approach 1:
The patent inverts the traditional sieve design by extending the sieve section beyond the wall surface into the chamber lumen. This reversal of the normal configuration (sieve inside vs. sieve outside) allows material to be discharged more effectively while preventing accumulation against the wall, as the extended sieve creates a protective overlap that guides material flow away from the wall surface.
Solution Approach 2:
The patent transitions from a two-dimensional sieve plane embedded in the wall to a three-dimensional extended sieve structure that protrudes into the chamber. This dimensional change creates an additional spatial dimension for material flow control, allowing material to be discharged through the sieve while the extended portion prevents wall accumulation by creating a protective overlap zone.
2Strength
If the frame section extends beyond the sieve section by a larger distance, then structural support is improved, but material gets caught in the sieve section and accumulation increases
Solution Approach 1:
The patent optimizes the extension distance parameter of the frame section to be less than 2 mm beyond the sieve section. This precise parameter control balances structural support requirements with the prevention of material accumulation. The small extension distance provides sufficient structural strength while minimizing the risk of material catching on the frame, thus preventing harmful accumulation.
3Ease of manufacture
If the downstream edge of the sieve section is flush with the wall, then manufacturing simplicity is improved, but material accumulation against the wall increases and hinders separation
Solution Approach 1:
Instead of embedding the sieve flush with the wall surface, the patent inverts the design by extending the sieve section beyond the wall into the chamber lumen. This reversal prevents material accumulation against the wall by creating a protective overlap, thereby maintaining high separation efficiency while the extension is minimized to less than 2 mm to balance manufacturing complexity.
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 effectively reduces material accumulation, ensuring that materials are properly separated and discharged, enhancing the processing efficiency of waste objects with varying densities and surface-to-weight ratios.
Implementation Method 1
plastic foil will swirl up due to the turbulence
Implementation Method 2
the direction of rotation of an upright shaft defines a flow direction for air above said rotational volume
Implementation Method 3
small parts (cardboard fibers) leave the chamber via the sieve openings while large parts (foil) are stopped by the wall
Implementation Method 4
said frame section - if said frame section is present at said downstream edge of said sieve section - extends into the lumen of said chamber with respect to said first sieve section side by a distance R of less than 2 mm beyond said first sieve section side
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
Method and arrangement for unraveling the waste objects, said arrangement comprising - a chamber comprising an upright wall, said upright wall provided with sieve openings, and - at least two upright shafts, provided with at least an arm extending transversely of the respective axis and into the chamber. For preventing problems due to accumulation of material against the wall, the wall is arranged as wall sections, a wall section comprising a frame section and a sieve section. The frame section, - if the frame section is present at a downstream edge of the sieve section, extends less than 2 mm into the lumen of the chamber beyond a first sieve section side facing the lumen. Furthermore, at the downstream edge of the sieve sheet, the second sieve section side facing away from the lumen extends deeper into the lumen than the upstream part of a downstream adjacent wall section.