Adjustable Roll Assembly for Stable Grinding Gap Control
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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 forces and non-homogeneous milling material properties due to the influence of gap stiffness and fluctuating forces during the milling process.
Innovation Solution
A roll assembly design featuring adjustable bearing bodies with abutment surfaces that counteract roll contact, allowing for precise control of the milling gap width through pretensioning and rotational adjustment of eccentric abutment surfaces, along with a tensioning device and force-measuring sensors to maintain consistent forces and properties of the milled material.
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 structure becomes more complex
Solution Approach 1:
The bearing bodies are made dynamically adjustable through a mechanism allowing relative movement between the first and second bearing bodies. This enables the milling gap width to be changed during operation while maintaining structural integrity, resolving the contradiction between precision control and structural simplicity.
Solution Approach 2:
The bearing assembly is segmented into a first bearing body and a second bearing body that can move independently relative to each other. This segmentation allows precise control of the milling gap while keeping each individual bearing body structurally simple, addressing both precision and complexity concerns.
2Stability of the object's composition
If pretensioning force is increased to maintain gap stiffness, then the milling gap remains stable, but the force between rolls increases
Solution Approach 1:
The system allows dynamic adjustment of the pretensioning force parameter between the bearing bodies. By optimizing this parameter, the milling gap maintains sufficient stability while avoiding excessive radial forces that would damage the rolls or bearings, thus resolving the contradiction between gap stability and force magnitude.
3Manufacturing precision
If the rolls are pressed together with high pretensioning force, then the milling gap remains constant, but the energy consumption increases
Solution Approach 1:
The bearing bodies incorporate a dynamic adjustment mechanism that allows the pretensioning force to be optimized for different operating conditions. This dynamic capability enables maintaining consistent milling gap precision while minimizing energy consumption by avoiding excessive pretensioning force, thus resolving the contradiction between precision and energy efficiency.
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 ensures a consistent milling gap width, resulting in homogeneous milling material properties by adjusting the pretensioning force and minimizing the impact of varying forces, thereby improving the quality of the milled product.
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 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 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).