Roller Mill Distributor Device for Material Segregation
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Solution Overview
Problem
Conventional roller mills experience inefficiencies due to separation phenomena in the delivery chute, leading to coarser material being crushed in edge regions rather than the more energy-efficient middle region, resulting in increased energy consumption.
Innovation Solution
A distributor device is placed above the middle region of the grinding gap in the delivery chute, covering a portion of its cross-section, to deflect coarser material into the middle region, reversing the grain size distribution and utilizing the more efficient crushing zone for coarser particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If material is fed into the delivery chute with a predetermined filling level, then wear of the grinding rollers is avoided, but separation phenomena occur causing coarser material to accumulate in edge regions and finer material in the middle region
Solution Approach 1:
The delivery chute is divided into multiple delivery chute cells with different outlet opening positions, segmenting the material flow paths to achieve different grain size distributions in different regions of the grinding gap
Solution Approach 2:
Different regions of the delivery chute are given different functions: the middle region delivers finer material while edge regions deliver coarser material, matching the local crushing efficiency characteristics of different grinding gap regions
2Productivity
If the delivery chute is divided into multiple delivery chute cells with different outlet positions, then grain size distribution is improved, but device complexity increases
Solution Approach 1:
The delivery chute structure serves multiple functions simultaneously: it maintains predetermined filling level for roller protection, distributes material to different regions, and achieves grain size separation without requiring external separation devices
3Duration of action of stationary object
If coarser material is crushed in edge regions and finer material in middle region, then roller wear is protected, but energy consumption increases
Solution Approach 1:
The conventional grain size distribution pattern is inverted: finer material is delivered to the middle region and coarser material to the edge regions, reversing the typical arrangement to match the inverted crushing efficiency characteristics of different gap regions
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 approach achieves an energy savings of up to 20% by ensuring coarser material is crushed in the more energy-efficient middle region of the grinding gap, improving overall mill efficiency.
Implementation Method 1
the material for grinding is introduced into the delivery chute or is deflected in the delivery chute in such a manner that, based on the longitudinal extent of the grinding gap, coarser material for grinding accumulates in a middle region of the grinding gap than in the edge regions
Data Source
AI summary
A roller mill for crushing brittle material has two grinding rollers forming a grinding gap, and provides a delivery chute for feeding the material to the grinding gap. In the delivery chute at least one distributor device is arranged above a middle region of the grinding gap and extends above the grinding gap transversely to the longitudinal extent of the grinding gap and covers from 5 to 70% of the cross-section of the delivery chute. The material is delivered to the delivery chute and is crushed in the grinding gap, wherein the material is introduced into the delivery chute or is deflected in the delivery chute in such a manner that, based on the longitudinal extent of the grinding gap, coarser material accumulates in a middle region of the grinding gap than in the edge regions.