Conical Refiner Blade Geometry for Debris Protection
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Solution Overview
Problem
Refiners with conically shaped refining blades are susceptible to damage from debris in the fibrous material, leading to costly shutdowns and damage to the expensive and delicate surface structures, as existing methods like pre-washing are not entirely effective in preventing debris from reaching the refining blades.
Innovation Solution
The design features inner conical refining blades with bars that extend further along the symmetry axis than the outer conical refining blades, causing debris to be knocked out of its path by the rotating inner blade, preventing it from entering the refining gap and minimizing damage to the refining blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If pre-washing methods are used to remove debris, then the cleanliness of fibrous material is improved, but debris can still reach the refining blades causing damage
Solution Approach 1:
The refiner is designed to handle and remove debris before it can damage the refining blades. The system performs preliminary action by allowing debris to settle or be removed from the fibrous material stream prior to the material contacting the delicate bar structures on the refining blades, thus preventing catastrophic damage
Solution Approach 2:
The design accepts that debris will occasionally contact the refining blades and causes damage. Rather than attempting to completely prevent all debris contact through expensive complex filtration, the system is designed to withstand occasional damage and allows for blade replacement or repair, treating the blades as components that may need periodic replacement
2Loss of substance
If washing processes are implemented to remove debris, then debris removal is improved, but complete prevention of debris contact is not achieved
Solution Approach 1:
The refiner design implements partial action by acknowledging that complete debris removal before refining is difficult and expensive. Instead, the system allows some debris to pass through the washing process and provides a second line of defense through the refiner's structural design, which can handle occasional debris contact without catastrophic failure
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 prevents debris from entering the refining gap while allowing fibrous material to be processed, reducing the risk of blade damage and extending the operational lifespan of the refiner.
Implementation Method 1
the rotating inner blade, preventing it from entering the refining gap
Implementation Method 2
the material will be brought into contact with the surfaces of the refining blades. The refining blades are provided in the refiner in such a way that they can be rotated around an axis. By rotating the refining blades the material present in the refining gap will be ground between the refining surfaces
Implementation Method 3
ground between the two surfaces
Data Source
AI summary
A refiner is disclosed comprising relatively rotatable inner and outer conical refining blades. The refining blades are coaxially arranged around a symmetry axis and are provided with first bars and second bars, respectively, for the grinding of fibrous material. The inner conical refining blade or any of the first bars of the inner conical refining blade extend further along the symmetry axis, in the direction of the tapering of the inner and outer conical refining blades, than the outer conical refining blade or any of the second bars of the counter conical refining blade.