Elastic Support Rings for Drum Stress Compensation
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Solution Overview
Problem
Existing drum dryers face challenges in maintaining stability and balanced assembly due to stress from operational and thermal factors, leading to potential material congestion, ignition risks, and increased assembly complexity and costs.
Innovation Solution
The use of statically load-bearing, elastically compensating omega-shaped support rings between the drum internals and wall, which provide flexible attachment points and absorb stresses, allowing for assembly outside the drum and reducing the need for rotating the drum during installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drum is rotated during assembly to avoid constrained positions, then assembly flexibility is improved, but assembly time and safety risks increase due to repeated clearing requirements
Solution Approach 1:
The drum assembly is divided into modular sections that can be assembled in predetermined positions without requiring drum rotation. The support rings and internals are designed as separate assemblies that fit into the drum at specific locations, eliminating the need to rotate the entire drum during assembly operations.
Solution Approach 2:
The support rings are pre-positioned on the drum at predetermined locations before installing the internals. This preliminary positioning allows the drum to remain stationary during assembly, avoiding the need for rotation and repeated clearing operations while maintaining assembly flexibility.
2Stability of the object's composition
If sliding pieces, joints, and spring units are used to compensate for stresses, then stress compensation is improved, but weight increases and material adhesion causes functional failure over time
Solution Approach 1:
The complex stress compensation mechanism involving sliding pieces, joints, and spring units is extracted and replaced with a simpler solution. The support rings are designed to be rigidly attached to the drum, eliminating the need for additional stress compensation components while reducing weight and preventing material adhesion issues.
Solution Approach 2:
The support rings are designed to self-compensate for thermal and mechanical stresses through their rigid attachment to the drum and internals. The structure inherently absorbs stresses through its design, eliminating the need for external compensation mechanisms and preventing functional failure over time.
3Manufacturing precision
If multiple individual parts are assembled inside the drum, then assembly precision is improved, but assembly complexity increases due to constrained positions and repeated drum rotation
Solution Approach 1:
The assembly process is segmented into discrete, predetermined positions for support rings and internals. Each component is designed to be assembled at specific locations without requiring drum rotation, reducing assembly complexity while maintaining precision through fixed positioning.
Solution Approach 2:
The support rings serve as intermediary elements that simplify the assembly process. They are designed to be attached at predetermined positions and provide stable mounting points for the internals, eliminating the need for complex assembly operations and repeated drum rotation while maintaining assembly precision.
4Reliability
If the drum is rotated to clear material and personnel, then safety is improved, but production time increases due to frequent stopping and cleaning
Solution Approach 1:
The drum is rotated to predetermined positions during assembly to clear material and ensure safety, but the assembly process is designed to minimize the number of rotations required. The support rings and internals are positioned to allow assembly at optimal locations, reducing the frequency of drum rotation and associated cleaning operations.
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 enhances stability, reduces assembly errors and time, and prevents material deposition, enabling efficient and safe operation while maintaining optimal heat transfer and material transport.
Implementation Method 1
several support rings (7) are arranged between the internals (8) and the wall of the drum (5), which are designed to be statically load-bearing, but nevertheless elastically compensate for tensile and compressive stresses
Implementation Method 2
it is also important to design and manufacture the drum in such a way that thermal stresses are absorbed and compensated for by different temperatures and different expansion behavior of the internals, the drum shell
Data Source
Figure 1
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AI summary
The drum (5) or drum segment has fixtures arranged in an inner side of the drum, which is rotatable around a middle axis. The fixtures mix and convey fluid materials when a temperature-controlled gaseous transfer fluid is conducted from a drum inlet to a drum outlet. Statically load-bearing support rings (7) elastically compensate tensile and compressive stresses and are positively and/or non-positively connected to the fixtures and/or a mounting frame (14), where the rings are arranged between the fixtures and the drum. An independent claim is also included for a method for manufacturing a drum or a drum segment for a drying system.