Pretensioned Roller Group With Eccentric Stops for Stable Grinding Gap
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Solution Overview
Problem
Existing roll assemblies for milling apparatuses face challenges in maintaining a constant milling gap width, leading to variable force conditions that affect the homogeneity of milled material properties, such as starch damage, water absorption, and particle size distribution, due to fluctuating mass flow and gap occupancy.
Innovation Solution
A roll assembly design featuring adjustable bearing bodies with eccentric abutment surfaces and a tensioning device that maintains constant relative positions of the rolls, allowing for precise adjustment of the milling gap width through rotational and translational mechanisms, and includes a force-measuring system to manage varying forces within the gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rolls are held by fixed bearing bodies, then the structure is simple, but the milling gap width cannot be adjusted
Solution Approach 1:
The bearing bodies are designed to be adjustable relative to each other, transforming the static structure into a dynamic one. The second bearing body can be positioned at different locations along the first bearing body, enabling continuous adjustment of the milling gap width while maintaining structural integrity
Solution Approach 2:
The bearing bodies are divided into modular components with discrete positioning locations. This segmentation allows the bearing bodies to be adjusted in controlled increments, providing flexibility in gap width adjustment while keeping the overall structure manageable and not overly complex
2Reliability
If the rolls are pressed together with high pretensioning force, then the milling gap width remains stable, but the force variations cause wear and stress
Solution Approach 1:
The pretensioning force is optimized to a specific range that provides sufficient stability for maintaining consistent milling gap width while avoiding excessive forces that would cause premature wear or stress damage to the bearing bodies and rolls
Solution Approach 2:
The adjustable bearing body design allows for pre-positioning the rolls at optimal locations that inherently compensate for force variations, cushioning against the effects of stress and wear before they occur during operation
3Adaptability or versatility
If the milling gap width is adjusted frequently, then the material properties are optimized, but the adjustment mechanism experiences wear
Solution Approach 1:
The dynamic adjustable bearing body design enables frequent repositioning of the rolls to optimize milling gap width for different material properties, while the robust modular construction ensures the mechanism withstands repeated adjustments without excessive wear
Solution Approach 2:
The bearing bodies are pre-configured with multiple predetermined positioning locations, allowing operators to quickly select and adjust to optimal gap widths without requiring complex real-time adjustments, thereby reducing wear on the adjustment mechanism while maintaining adaptability
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
This design ensures consistent milling gap width and material properties by adjusting the pretensioning force between bearing bodies, reducing the impact of force variations and allowing for precise control over the milling process, thereby enhancing the homogeneity of the milled material.
Implementation Method 1
the abutment surfaces are formed and are or can be arranged on the bearing bodies in such a way that a contact of the abutment surfaces counteracts a contact of the rolls
Implementation Method 2
The first abutment surface is formed by a circumferential surface of the first abutment body that is eccentric with respect to the first axis of rotation, specifically in such a way that the rotational position of the first abutment body determines the minimum width of the milling gap
Implementation Method 3
The first bearing body and the second bearing body can be pretensioned with respect to one another by means of a tensioning device in such a way that the first roll and the second roll are pressed toward one another
Data Source
AI summary
Roller packages (IO) for grinding devices (70), comprising a first roller (II), which is maintained by at least one first bearing body (13), and a second roller (12), which is maintained by at least one second bearing body (14). The first bearing body (13) and the second bearing body (14) are prestressed against each other and comprise stop elements (17, 19) with stop surfaces (18, 20), the contact of which counteracts a contact of the rollers (II, 12). The rotational position of the first stop element (17) determines the minimum width of the grinding gap. Also disclosed are grinding devices (70), methods for operating a roller group (IO) and methods for determining the radial force acting between the rollers (II, 12) of a roller group (IO).