Double-Walled Comminution Housing for High-Throughput Recycling
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Solution Overview
Problem
Existing shredding devices for recovering secondary raw materials face limitations in material throughput due to outlet opening constraints, which hampers efficient processing and dust production.
Innovation Solution
A shredding device with a double-walled second comminution stage equipped with friction sieves on both inner and outer walls, utilizing an air vortex for enhanced comminution, and adjustable suction to optimize material throughput and particle size distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-walled housing with outlet openings is used in the comminution device, then the device structure is simple, but the material throughput is limited
Solution Approach 1:
The housing is divided into a double-walled structure with an inner wall and an outer wall, each equipped with its own outlet openings and screens. This segmentation allows material to be discharged through multiple pathways simultaneously, significantly increasing the overall material throughput while maintaining a manageable structural complexity through modular design
Solution Approach 2:
The outlet openings are arranged in different spatial dimensions - the inner wall outlets are positioned differently from the outer wall outlets, creating multiple discharge directions and pathways. This dimensional arrangement allows material flow to be distributed across different spatial zones, preventing bottlenecks and enhancing throughput capacity
2Productivity
If outlet openings are increased in size or number, then material throughput improves, but particle size control and comminution quality deteriorate
Solution Approach 1:
Different regions of the housing (inner wall vs. outer wall) are equipped with screens having different opening sizes and configurations tailored to local requirements. The inner wall screens can be optimized for finer particle separation while outer wall screens handle coarser material discharge, allowing each zone to maintain particle size control while collectively achieving high throughput
Solution Approach 2:
The screening function is segmented across two separate walls with independent screen configurations. This allows the system to simultaneously perform different separation tasks - fine comminution on one wall and coarser discharge on the other - thereby maintaining particle size control while increasing overall material processing capacity
3Productivity
If a double-walled housing with screens on both walls is implemented, then material throughput significantly improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The double-walled housing structure serves multiple functions simultaneously: it provides structural support, creates multiple discharge pathways for increased throughput, enables differential particle size separation through independent screen configurations, and facilitates easier cleaning and maintenance. This multi-functionality justifies the increased manufacturing complexity by delivering superior operational performance across multiple parameters
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
Significantly improves material throughput and produces finely comminuted secondary raw materials with defined particle sizes, suitable for recycling various materials including fiber composites and wood, while enabling efficient dust production for fuel applications.
Implementation Method 1
a first comminution stage with a percussion tool rotating in a cylindrical housing, to the central area of which a feed channel for the disposed material is led, wherein the percussion tool rotates at high speeds and thereby generates a radial air vortex of high velocity
Implementation Method 2
the double-walled housing of the second comminution stage is provided on the outer wall with a first screen and on the inner wall with a second screen, wherein correspondingly finely ground material fractions pass through these screens into a collection chamber downstream of the respective screen
Implementation Method 3
a first comminution stage with a percussion tool rotating in a cylindrical housing, wherein the percussion tool rotates at high speeds and thereby generates a radial air vortex of high velocity, which in the first comminution stage guides the impact-compressed material fractions
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a comminuting device (1) for reclaiming secondary raw materials (99) from discarded material (90), comprising the following: a first comminuting stage (10) with a supply channel (50) for supplying the discarded material (90) to a first housing (11) with a rotating impact tool (12) for comminuting the discarded material (90) into an impact-comminuted material fraction (91) and for generating an air vortex which passes the impact-comminuted material fractions (91) from the first comminuting stage (10) between the walls of a double-walled second housing (21) of a second comminuting stage (20) mounted downstream of the first comminuting stage (10), wherein the double-walled housing (21) of the second comminuting stage (20) is provided with a first screen on the outer wall (22) and a second screen on the inner wall (23), and finely comminuted material fractions (92, 93) reach a collection chamber (42, 43) mounted downstream of each screen through the corresponding screen. Advantageously, the permeability through the screens arranged on the double-walled housing (21) and the throughput are increased in the second comminuting stage. An embodiment for obtaining different grain size distributions using different screen arrangements is particularly preferred.