Method for designing refiner plates with three-stage radial curved bars

A method for designing a refiner plate with three-stage radial curved bars, comprising following steps of:

• 1) designing a first circle arc for 1st stage radial curved bars:
• defining a first angle of inclination, establishing a center circle arc for the 1st stage radial curved bars by the first angle of inclination and a starting position, and establishing a first equation of circle arcs for the 1st stage radial curved bars;
• 2) designing a second circle arc for 2nd stage radial curved bars:
• defining a second angle of inclination and a radius of a circle where the 2nd stage radial curved bars start, dividing the refiner plate into zones, establishing a second equation of circle arcs for the 2nd stage radial curved bars, and uniformly distributing the 2nd stage radial curved bars between the adjacent 1st stage radial curved bars;
• 3) designing a third circle arc for 3rd stage radial curved bars:
• defining a third angle of inclination and a radius of a circle where the 3rd stage radial curved bars start, dividing the refiner plate into zones, establishing a third equation of circle arcs for the 3rd stage radial curved bars, and uniformly distributing the 3rd stage radial curved bars between the 1st stage radial curved bars and the 2nd stage radial curved bars or between the adjacent 2nd stage radial curved bars;
• 4) dividing the refiner plate into a plurality of segments by designing a center angle for each of the segments according to a size of the refiner plate and manufacture requirements and designing a bar shape of each of the segments according to the center angle for each of the segments;
• and
• 5) machining the refiner plate based on design results obtained in steps 1) to 4.