Vertical Roller Mill Scraper Dynamics for Stable Grinding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vertical roller mills experience operational inefficiencies due to the need for frequent stoppages to adjust the scraper height in response to fluctuations in material layer thickness, leading to vibrations and unstable grinding processes.
Innovation Solution
A vertically adjustable scraper system with a mobilizing mechanism allowing the scraper to swing and adjust its height automatically in response to changing layer thickness, incorporating a weight for resistance and adjustable range limits, ensuring optimal contact with the material and minimizing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed scraper is used to uniformize layer thickness, then mill vibration is reduced, but operation efficiency declines due to frequent stoppages for height adjustment
Solution Approach 1:
The scraper is designed with a movable support member that can dynamically adjust its position vertically. The support member includes a movable body that swings about a horizontal axis, allowing the scraper to automatically adapt to changing layer thickness during operation without requiring stoppages for manual adjustment.
Solution Approach 2:
The scraper system uses the material layer itself to drive the adjustment mechanism. When the layer thickness increases, the material pushes the scraper upward, automatically adjusting the scraper height to match the new layer thickness without external intervention or system stoppage.
2Manufacturing precision
If scraper height is manually adjusted to match layer thickness, then grinding stability is improved, but time loss occurs during adjustment operations
Solution Approach 1:
The scraper is pre-configured with a movable support structure that is ready to adjust automatically when layer thickness changes occur. The mobilizing means and resistance adding means are pre-installed to enable immediate response to layer thickness variations without requiring manual intervention.
Solution Approach 2:
The scraper system provides automatic feedback-based adjustment where changes in layer thickness directly cause corresponding adjustments in scraper position. The movable support member responds to the physical state of the material layer, creating a self-regulating system that maintains optimal layer thickness uniformity continuously.
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 system enables continuous operation by automatically adjusting the scraper height, reducing mill vibrations and enhancing grinding efficiency through deaeration and consolidation of the material, thereby stabilizing the grinding process.
Implementation Method 1
incorporating a weight for resistance and adjustable range limits
Implementation Method 2
A vertically adjustable scraper system with a mobilizing mechanism allowing the scraper to swing and adjust its height automatically
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This vertical roller mill is provided with: a rotary table having a grinding surface; a grinding roller (3) for biting and grinding a material between the grinding surface and the same; and a scraper (13) for adjusting a layer thickness of the material supplied to the grinding roller (3). The scraper (13) has: a scraper body (15) separately arranged above the grinding surface of the rotary table; a mobilizing means (16) for allowing the scraper body (15) to move in a direction away from the grinding surface; and a resistance adding means (17) for adding a resistance force to the movement of the scraper body (15) in the direction away from the grinding surface. Even when the layer thickness of the material supplied onto the grinding surface of the rotary table fluctuates, a height position of the scraper is automatically adjusted according to the fluctuation in layer thickness.