Grinding Roller Assembly With Eccentric Stops for Stable Gap Width
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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, especially when dealing with fluctuating mass flow rates.
Innovation Solution
A roll assembly design featuring adjustable bearing bodies with abutment surfaces that counteract roll contact, allowing for precise adjustment of the milling gap width through rotational positioning of eccentric abutment surfaces and pretensioning, while using a tensioning device to maintain consistent force distribution, and incorporating a position indicator and force-measuring sensors to monitor and control forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bearing bodies are made adjustable to control milling gap width, then the milling gap can be precisely controlled, but the device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The bearing bodies are made dynamically adjustable through rotational positioning of the second bearing body relative to the first bearing body. The abutment surfaces are designed with eccentric geometry that converts rotational motion into precise linear positioning of the milling gap, allowing dynamic control without complex mechanical linkages
Solution Approach 2:
The invention changes the geometric parameter of the abutment surfaces by making them eccentric with respect to the rotation axis. This eccentric geometry allows the bearing bodies to maintain precise positional control while simplifying the adjustment mechanism, as the eccentric offset directly determines the milling gap width without requiring additional positioning components
2Stability of the object's composition
If pretensioning force is increased to maintain consistent gap width under varying forces, then material homogeneity improves, but the radial forces between rolls increase
Solution Approach 1:
The abutment surfaces are designed to provide a counteracting force that opposes the radial forces between the rolls. When the rolls experience varying radial forces during operation, the abutment surfaces generate compensating forces through their eccentric geometry and pretensioning arrangement, maintaining constant gap width without requiring excessive pretensioning force
Solution Approach 2:
The pretensioning mechanism creates a feedback system where the bearing bodies automatically adjust their positioning in response to varying radial forces. The eccentric abutment surfaces convert force variations into positional corrections, maintaining consistent milling gap width dynamically without external control
3Stability of the object's composition
If the abutment surfaces are designed to counteract roll contact, then the milling gap stability improves, but the device complexity increases due to additional bearing body components
Solution Approach 1:
The invention merges multiple functions into the bearing bodies: they simultaneously support the rolls, provide adjustable positioning through rotation, and generate counteracting forces through their abutment surfaces. This integration eliminates the need for separate positioning and force-generation mechanisms, reducing overall device complexity while maintaining gap stability
Solution Approach 2:
The bearing bodies are designed as multi-functional components that perform support, positioning, and force counteraction simultaneously. The rotatable design with eccentric abutment surfaces allows a single component to achieve multiple objectives, simplifying the overall structure compared to using separate dedicated components for each function
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 a consistent milling gap width, maintaining homogeneous material properties by adjusting the pretensioning force and minimizing the impact of varying forces within the milling gap, thereby improving the quality of milled materials.
Implementation Method 1
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
Implementation Method 2
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 3
The first abutment body is rotatable about a first axis of rotation. 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
Data Source
AI summary
Roller packages (IO) for grinding devices (70), comprising a first roll (11), which is maintained by at least one first bearing body (13), and a second roll (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 rolls (11, 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 roll assembly (10) and methods for determining the radial force acting between the rolls (11, 12) of a roll assembly (10).