Grinding Device With Opposing Rotor And Sieve Speeds
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Solution Overview
Problem
Existing grinding devices face challenges in achieving a high throughput rate and variable particle size distribution while preventing temperature increases and sieve clogging, especially when processing fine powders.
Innovation Solution
A grinding device with a rotor and a rotating sieve, where the rotor and sieve have adjustable rotational speeds and orientations, allowing a peripheral speed difference of 100 m/s to 400 m/s and opening widths between 1 mm and 20 mm, reducing particle size by a factor of 5 to 20 and minimizing temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational speed of the rotor is increased to achieve high grinding rate, then productivity increases, but temperature of the crushed matter increases which is detrimental to quality
Solution Approach 1:
The invention makes the sieve rotate in opposition to the rotor rotation, creating a dynamic system where both components are in motion. This dynamic configuration allows for variable peripheral speed differences (100-400 m/s) that optimize grinding efficiency while the continuous motion prevents material stagnation and excessive heat buildup, resolving the contradiction between high productivity and temperature control
Solution Approach 2:
The invention changes the operational parameters by introducing variable rotational speeds for both the rotor and sieve, creating a variable peripheral speed difference (100-400 m/s). This parameter adjustment allows optimization of the grinding process to achieve high throughput while controlling temperature rise through optimized speed combinations
2Manufacturing precision
If the sieve openings are made smaller to achieve finer particle size distribution, then manufacturing precision improves, but the risk of sieve blocking increases
Solution Approach 1:
By making the sieve rotate in opposition to the rotor, the invention creates continuous motion that prevents material from adhering to and blocking the sieve openings. The dynamic configuration with variable peripheral speed differences (100-400 m/s) ensures that even fine particles are continuously moved across the sieve surface, maintaining reliability while achieving fine particle size distribution
Solution Approach 2:
The opposing rotation of the sieve creates a periodic action where material is continuously presented to and removed from the sieve openings. This periodic motion prevents clogging by ensuring that no single location on the sieve remains stationary long enough for material to adhere and block the openings, thus maintaining both fine particle size and sieve reliability
3Productivity
If the rotor speed is increased to reduce particle size faster, then productivity increases, but the temperature increase becomes more significant
Solution Approach 1:
The invention introduces dynamic motion to both the rotor and sieve, creating a system where the relative motion between opposing surfaces provides efficient size reduction. The variable peripheral speed difference (100-400 m/s) allows optimization of grinding intensity while the continuous motion of both components prevents material stagnation, enabling high throughput with controlled temperature rise
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
The solution enables a high grinding rate, variable particle size distribution, and reduced risk of sieve clogging, achieving finer particle sizes and maintaining product quality by adjusting rotational speeds and sieve orientations.
Implementation Method 1
The material to be granulated is smashed by the rotor and/or pressed between the rotor and the sieve
Implementation Method 2
The material to be granulated is smashed by the rotor and/or pressed between the rotor and the sieve
Implementation Method 3
a sieve comprising a plurality of openings and configured for classifying and/or splitting the matter crushed by the rotor
Data Source
AI summary
A grinding device including a rotor, mounted in rotational manner around an axle and having a plurality of blades extending radially relative to the axle. A sieve has a plurality of openings, with the sieve being mounted around the rotor so as to turn around the axle in the direction opposite the direction of rotation of the rotor. The rotor and sieve each has a height extending parallel to the axle and a width extending perpendicular to the axle wherein the width is between 1 mm and 20 mm. The rotation of the rotor and of the sieve is adjustable so as to reach a difference in circumferential speed between the rotor and the sieve between 100 m/s and 400 m/s, so as to reduce the average initial size of the crushed matter by a factor of 5 to 20.