Refiner Plate Design with Three-Stage Radial Curved Bars
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Solution Overview
Problem
Current designs for refiner plates with curved bars lack a systematic method for defining the angle of inclination and equation of circle arcs, making it complex to design and manufacture three-stage radial curved bars effectively.
Innovation Solution
A method is developed to design refiner plates with three-stage radial curved bars by defining the angle of inclination and starting angle of inclination for each stage, establishing specific curve equations for center and edge circle arcs, and uniformly distributing bars, allowing for flexible and precise design and manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If curved bars are used in refiner plates, then the angular change during bar interaction is reduced, but the design complexity of the curves increases
Solution Approach 1:
The patent applies parameter changes by defining the curved bars through mathematical parameters (polar coordinates, radius R, angle α) rather than free-form curves. The curve equation r = R/(1 + cos(θ - α)) transforms the design from complex geometric shaping to parameter specification, maintaining consistent angular change while simplifying the design process through mathematical formulation.
2Adaptability or versatility
If multi-stage curved bars are introduced, then the refining zones are differentiated, but the design methodology becomes less defined
Solution Approach 1:
The patent applies segmentation by dividing the refiner plate into three distinct stages (coarse refining, medium refining, fine refining) with different bar configurations. Each stage has specific parameters (number of bars, angles, positions) that can be independently designed and manufactured, providing clear methodology for multi-stage differentiation while maintaining ease of manufacture through standardized design procedures.
Solution Approach 2:
The patent applies local quality by assigning different characteristics to different regions of the refiner plate. Each stage has optimized bar parameters (angles, spacing, curvature) tailored to its specific refining function, allowing localized optimization without compromising the overall design methodology.
3Adaptability or versatility
If the bar width varies in the radial direction, then the design flexibility increases, but the manufacturing precision decreases
Solution Approach 1:
The patent applies equipotentiality by maintaining constant bar width across the radial direction through the mathematical formulation. The curve equation and design methodology ensure that all bars at the same stage have consistent width, creating uniform conditions for manufacturing while still providing design flexibility through parameter variation in other aspects (angles, positions, number of bars).
Data Source
AI summary
The present invention discloses a method for designing a refiner plate with three-stage radial curved bars, comprising following steps of: designing a circle arc for 1st stage radial curved bars; designing a circle arc for the 2nd stage radial curved bars; designing a circle arc for 3rd stage radial curved bars; and designing a center angle for the refiner plate according to the size of the refiner plate and the manufacture requirements, to complete the design of the refiner plate. In the present invention, by the establishment of equations for the circle arcs and angles of inclination of the curved bars, it is ensured that the width of the bars will not change in the radial direction, and both the flexibility in designing a curved refiner plate and the uniformity of crushing are improved. This design method provides a theory basis and also instructions for designing multi-stage radial curved bars.