Rotor Speed Control in Refiners for Short-Fiber Beating
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Solution Overview
Problem
Existing refiners face limitations in adjusting the gap between the stator beating part and the rotor beating part, particularly when dealing with materials having short fibers or no stiffness, leading to inadequate beating performance.
Innovation Solution
The refiner variably controls the rotation of the motor of the rotor beating part using a motor control part, rather than adjusting the gap between the stator and rotor beating parts, to enhance beating efficiency for materials with short fibers or no stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gap between the stator beating part and the rotor beating part is adjusted, then the beating performance is improved for conventional materials, but the refiner cannot handle materials with short fibers or no stiffness
Solution Approach 1:
The patent changes the control parameter from gap size to motor rotation speed. By varying the rotation speed of the motor driving the rotor beating part, the refiner can adapt to different raw materials including those with short fibers or no stiffness, without requiring complex gap adjustment mechanisms.
Solution Approach 2:
The patent introduces dynamic control of the motor rotation speed to replace static gap adjustment. The motor speed can be varied in real-time according to the specific raw material being processed, providing flexibility and adaptability while simplifying the mechanical structure.
2Power
If the gap between the stator beating part and the rotor beating part is reduced, then the beating intensity is increased, but the refiner cannot effectively process materials with short fibers or no stiffness
Solution Approach 1:
The patent changes the control approach from adjusting gap size to controlling motor rotation speed. By increasing the rotation speed, the beating intensity is enhanced while maintaining the ability to process materials with short fibers or no stiffness, which would be difficult with gap reduction alone.
Solution Approach 2:
The high-speed rotation of the rotor beating part creates periodic impact forces on the raw material. This periodic action at varying speeds allows effective beating of short fiber materials and materials with no stiffness, providing both intensity and adaptability.
3Device complexity
If a fixed gap between the stator beating part and the rotor beating part is used, then the device structure is simplified, but the refiner lacks flexibility for different raw materials
Solution Approach 1:
The patent maintains a fixed mechanical gap structure for simplicity but introduces variable motor rotation speed as the control parameter. This allows the refiner to adapt to different raw materials including short fibers and non-stiff materials by changing the rotation speed, not the gap size.
Solution Approach 2:
The motor control system automatically adjusts the rotation speed according to the raw material characteristics, eliminating the need for manual gap adjustment. The system serves itself by adapting to different materials through speed control rather than mechanical reconfiguration.
Data Source
AI summary
A refiner for beating a raw material supplied between a stator beating part and a rotor beating part, and discharging the beaten raw material, the refiner including a rotating shaft, the rotor beating part attached to the rotating shaft, a motor configured to drive the rotating shaft; and a motor control part configured to variably control a rotation of the motor. The rotation of the motor of the rotor beating part is controlled by the motor control part to beat the raw material.