Multi-Bearing Roller Arrangement for Stable Roll Gap Positioning
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Solution Overview
Problem
Conventional roller mills are inadequate for processing materials with varying material properties during continuous production, leading to uneven rolling forces and resulting in inconsistent material thickness and properties due to the inability to effectively manage bearing play and load distribution across multiple rolls.
Innovation Solution
A roll arrangement with axially parallel rolls, where specific bearing configurations generate alternating compressive and tensile stresses between diagonally spaced bearings, allowing for nested force guidance and precise adjustment of roll gaps through a pressure-controlled actuator, enabling effective load distribution and minimizing bearing play.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional single bearing arrangements are used per roller journal, then the structure is simple, but bearing play causes inconsistent roll gap positioning under varying loads
Solution Approach 1:
The bearing support system is segmented into multiple bearings (at least two) arranged axially side by side on each roller journal, replacing a single bearing arrangement. This segmentation allows independent stress management for each bearing, enabling precise control of roll gap positioning by distributing and alternating tensile and compressive stresses across multiple bearing elements.
Solution Approach 2:
Multiple bearings are nested axially on the same roller journal, creating a compact arrangement where bearings support each other in series. The inner and outer bearings of adjacent rollers are arranged to generate alternating stresses that nest together, forming a coordinated stress distribution system that eliminates bearing play while maintaining structural compactness.
2Manufacturing precision
If bearings are pre-tensioned to eliminate play, then roll gap positioning is stable, but bearing clearance increases
Solution Approach 1:
The bearing stress state is made dynamic and alternating rather than statically pre-tensioned. By alternating tensile and compressive stresses between diagonally spaced bearings during operation, the system adapts to varying loads while maintaining stable roll gap positioning. This dynamic stress alternation eliminates the need for permanent pre-tensioning that would increase bearing clearance.
Solution Approach 2:
The stress parameters (tensile/compressive states) of the bearings are changed alternately during operation based on load conditions. This parameter change allows the bearing system to maintain optimal positioning stability without requiring fixed pre-tensioning, thereby avoiding increased bearing clearance while adapting to varying rolling forces.
3Reliability
If multiple bearings are arranged axially side by side, then load distribution is improved, but the bearing arrangement becomes more complex
Solution Approach 1:
The bearing arrangement utilizes asymmetric stress distribution where inner and outer bearings of adjacent rollers are subjected to different stress types (tensile vs. compressive). This asymmetric stress assignment optimizes load distribution across the bearing series while maintaining a relatively simple geometric arrangement, avoiding the need for complex symmetric configurations.
Solution Approach 2:
The bearing arrangement extends into the axial dimension by placing multiple bearings side by side along the roller journal axis. This dimensional extension allows load distribution across multiple bearing elements without increasing radial or lateral complexity, organizing the bearing system along the axial direction to simplify overall configuration.
4Manufacturing precision
If bearing stresses are alternated between diagonally spaced bearings, then roll positioning precision is maintained under varying loads, but the control mechanism becomes more complex
Solution Approach 1:
The bearing system achieves self-regulating stress distribution through its geometric arrangement and load path. The alternating tensile and compressive stresses between diagonally spaced bearings are generated automatically by the rolling process loads themselves, without requiring external active control mechanisms. The structure serves itself by converting applied loads into the required alternating stress pattern.
Solution Approach 2:
The stress control function is merged with the load-bearing function of the same bearing elements. The same bearings that support the roller journals also generate the alternating stresses required for precise positioning control. This merging eliminates the need for separate control mechanisms, reducing overall system complexity while maintaining positioning precision.
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
The invention relates to a first roller arrangement (1) comprising at least two rollers (2, 3) having parallel axes, wherein: a roll gap (5) is formed between adjacent rollers; each of the rollers (2, 3) has a roll journal (7, 8) at each of the two axial ends (6) thereof and each roller (2, 3) is mounted via the two roll journals (7, 8) thereof; at least two bearings (9, 10) are positioned axially adjacent to one another at least on a first roll journal (7) of a first of the rollers (2) and an adjacent first roll journal (7) of a second of the rollers (3); a compressive stress is generated between an inner bearing (9) on the first roll journal (7) of the first roller (2) and an outer bearing (10) on the first roll journal (7) of the second roller (3), and a tensile stress is generated between an outer bearing (10) on the first roll journal (7) of the first roller (2) and an inner bearing (9) on the first roll journal (7) of the second roller (3), or vice versa.