Self-aligning Roller Support for Rotary Kilns
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Solution Overview
Problem
Large rotating bodies, such as rotary kilns, face alignment issues due to wear and tear, distortion, and axial thrust loads, leading to increased stresses and friction, which are difficult to maintain with existing roller support systems, especially with antifriction bearings that do not allow axial shift.
Innovation Solution
A self-aligning support system using a pivot plate mounted between the roller support bearings and the structural frame, where the axial thrust force from misalignment drives the roller assembly towards the neutral position, reducing reactionary force to zero when alignment is achieved, allowing for self-adjustment and minimizing maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fixed roller support systems are used with antifriction bearings, then the bearing structure is simple and easy to manufacture, but the rollers cannot self-adjust alignment and require frequent manual adjustments
Solution Approach 1:
The roller support system is designed to automatically self-align through the pivot plate mechanism. When the roller axis deviates from the neutral position, an axial thrust force is generated that automatically drives the roller back to alignment without requiring manual intervention. This self-correcting mechanism eliminates the need for frequent manual adjustments while maintaining reliable alignment.
Solution Approach 2:
The system incorporates a feedback mechanism where the alignment status of the roller directly influences its position through the pivot plate. The axial thrust force generated by misalignment serves as feedback that automatically corrects the deviation, creating a closed-loop self-regulating system that maintains proper alignment continuously.
2Reliability
If sleeve bearings allowing axial shift are used, then roller alignment can be adjusted, but the device complexity increases and antifriction bearings cannot be used
Solution Approach 1:
The pivot plate serves as an intermediary element between the roller bearing assembly and the fixed support structure. It provides the necessary degrees of freedom for self-alignment while allowing the use of standard antifriction bearings. The pivot plate translates axial thrust forces into rotational movement, enabling alignment adjustment without requiring complex bearing assemblies or axial shift capabilities in the bearings themselves.
3Reliability
If frequent manual alignment checks and adjustments are performed, then proper alignment can be maintained, but loss of time and increased operational complexity occur
Solution Approach 1:
The automatic self-aligning mechanism eliminates the need for manual alignment checks and adjustments. The system continuously maintains proper alignment through the pivot plate's self-correcting action, freeing operators from time-consuming alignment tasks and allowing them to focus on other operational duties.
Solution Approach 2:
The self-aligning mechanism operates continuously without interruption, maintaining proper alignment at all times rather than requiring periodic manual interventions. This continuous automatic alignment ensures consistent operational reliability without downtime or loss of productive time.
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 ensures proper alignment of rollers with the rotating body, reducing friction and wear, extending the life of bearings and tires, and eliminating the need for frequent manual adjustments, thereby enhancing operational reliability and reducing maintenance costs.
Implementation Method 1
the axial thrust force generated by a misaligned or skewed roller drives the roller support assembly towards the aligned or neutral skewed position
Implementation Method 2
The pivot plate is pinned in such fashion that the axial thrust force generated by a misaligned or skewed roller drives the roller support assembly towards the aligned or neutral skewed position
Data Source
AI summary
An apparatus for rotatably supporting a rotating cylindrical body. The apparatus comprises a pair of roller assemblies for supporting an annular bearing surface of a rotating cylindrical body. Each of the roller assemblies comprises a cylindrical roller having a circumferential bearing surface in supporting engagement with the annular bearing surface of the rotating body; first and second shaft extensions extending from the roller; bearings for rotatably supporting the first and second shaft extensions; and a pivot plate for supporting the bearings, the pivot plate being pivotally attached to a base by a pivot pin such that the cylindrical roller self-adjusts to the annular bearing surface of the rotating body.