Roller Mill Mode Switching via Independent Motor Speed Control
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Solution Overview
Problem
Conventional roller mills face challenges in efficiently switching between different operating modes due to fixed speed ratios, leading to increased production and operating costs, as they require stopping and reorienting rollers to change modes, which is cumbersome and energy-intensive.
Innovation Solution
The roller mill design incorporates two electrical machines with different power ratings and frequency converters, allowing for adjustable speed control during operation, enabling seamless transitions between modes without stopping, and utilizing a power coupler to optimize energy usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional roller mills use fixed speed ratios with a common motor, then the device complexity is reduced, but the adaptability between operating modes (cutting-cutting and back-back) deteriorates
Solution Approach 1:
The common motor is segmented into two separate motors, each independently controlling one roller. This allows independent speed adjustment of each roller, enabling flexible switching between cutting-cutting and back-back operating modes without increasing overall system complexity
Solution Approach 2:
The system transitions from fixed speed ratios to dynamic, independently adjustable speeds. Each motor can be controlled to provide different rotational speeds to each roller, allowing the system to adapt to different operating requirements and grain types in real-time
2Productivity
If roller mills require stopping and reorienting rollers to change operating modes, then the device complexity remains low, but the productivity and loss of time increase
Solution Approach 1:
The roller mill can switch between cutting-cutting and back-back operating modes while continuing to grind grain. The independent motor control allows seamless transition between modes without stopping the rollers, maintaining continuous productive action and eliminating downtime
Solution Approach 2:
The system uses dynamic speed adjustment through independent motors to change operating modes during operation. By varying the rotational speeds of individual rollers, the system can transition between modes without mechanical reorientation or stopping, thus avoiding time loss
3Ease of operation
If roller mills use a common motor with fixed transmission ratio, then the manufacturing cost is reduced, but the ease of operation and speed adjustment capability deteriorate
Solution Approach 1:
The single common motor is segmented into two separate motors with independent control. Each motor can be independently adjusted to provide optimal speeds for different grain types and operating modes, significantly improving ease of operation despite the additional manufacturing component
Solution Approach 2:
The system enables continuous parameter changes in rotational speed for each roller independently. This allows operators to easily adjust speeds to optimize grinding performance for different grains, making the system more versatile and easier to operate across various applications
Data Source
Figure 1a~1b
Figure 2
Figure 3a~3b
AI summary
The invention relates to a roller mill (10) with a first corrugating roller (12) having a plurality of first corrugating edges (32) and first corrugating backs (34), and with a second corrugating roller (14) having a plurality of second corrugating edges (36) and second corrugating backs (38). The roller mill can be operated in an edge-to-edge mode, in which the first edges and the second edges are brought close together, and in a back-to-back mode, in which the first backs and the second backs are brought close together. A change between the edge-to-edge mode and the back-to-back mode can be effected during operation by changing the rotational speed of the first corrugating roller and/or a change in the rotational speed of the second corrugating roller.