Drum Shredder Trap Design for Density-Based Waste Separation
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Solution Overview
Problem
Existing waste management systems struggle to effectively separate expanded polymeric materials from contaminants like metal, nails, concrete, and cardboard, leading to reduced material purity and quality due to contamination.
Innovation Solution
A drum shredder system with a rotatable drum equipped with ripping means and a trap mechanism, utilizing air flow and gravitational uplift to separate high-density contaminants from low-density expanded polymeric material, enhancing separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual separation of materials is performed at recycling centres, then materials can be placed in different containers, but contamination still occurs and material purity is reduced
Solution Approach 1:
The patent replaces manual mechanical separation with an automated drum shredder system that uses mechanical ripping means and air flow to automatically separate expanded polymeric material from contaminants. The drum with ripping teeth mechanically shreds the material while air flow separates contaminants based on density differences, eliminating the need for manual sorting and significantly improving material purity.
Solution Approach 2:
The patent uses air flow (pneumatics) as the separating medium to divide shredded material into light and heavy fractions. Air flow lifts and transports low-density expanded polymeric material while high-density contaminants fall through or are collected separately, providing automated separation that overcomes the limitations of manual sorting.
2Device complexity
If expanded polymeric material is shredded without separation, then processing is simpler, but the output quality is lowered due to contamination
Solution Approach 1:
The patent segments the shredded material into different density fractions using air flow separation. The shredding process is divided into: (1) mechanical shredding by drum with ripping teeth, (2) air flow separation into light and heavy fractions, and (3) collection of purified expanded polymeric material. This segmentation allows the system to maintain relatively simple operation while achieving high output quality.
3Productivity
If a drum shredder is used to shred expanded polymeric material, then material is divided into smaller parts, but high-density contaminants remain mixed with the shredded material
Solution Approach 1:
The patent introduces air flow as an intermediary medium between the shredding process and the separation outcome. The air flow acts as a mediator that selectively interacts with shredded material based on density, lifting and transporting low-density expanded polymeric material while allowing high-density contaminants to separate naturally, thus achieving effective separation without complicating the shredding mechanism.
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 system achieves a significant increase in the purity of shredded expanded polymeric material by effectively separating contaminants, with up to 90% removal of unwanted materials, resulting in higher-quality output.
Implementation Method 1
When the rotating drum rotates along a rotational direction, then an uplift will be created in the rotating drum in the rotational direction, causing low-density waste material to be lifted relative to high-density material.
Implementation Method 2
an air flow means adapted to provide an air flow from the channel inlet to the channel outlet and/or from the trap towards the channel outlet causing low-density waste material to move towards the channel outlet while the high-density waste material remains in the trap.
Data Source
Figure 1
Figure 2
Figure 3A~3E
AI summary
A drum shredder (10) and a shredder system (100) for shredding low-density waste material such as expanded polymeric material, while separating high-density waste material from said low-density waste material, the drum shredder (10) comprising: a rotatable drum (20) comprising ripping means (22); a shell (30) encompassing at least a part of the rotatable drum (20), thereby defining a channel (40) around the rotatable drum (20), a channel inlet (42) for receiving waste material and a channel outlet (44); and a trap (50) positioned between the channel inlet (42) and the channel outlet (44), the trap (50) comprising a trap chamber (52) for accumulating high-density material and optionally, a trap outlet (54) for removing the accumulating high-density material. The shredder system (100) further comprises a buffer (110) connected to the channel outlet (44).