Rotating Folding Roll Fluid Valving Arrangement
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Solution Overview
Problem
Elongated rotating rolls in paper processing face challenges with high-speed operation and increased length due to structural limitations, including inadequate support for internal gripping and cutting structures, and slow uniform fluid application, which affects operational speed and product quality.
Innovation Solution
A folding roll apparatus with a rotatable outer tube supported by a non-rotatable inner tube via a fluid valving arrangement, providing angularly controlled fluid transfer and distributed bearing support, eliminating the need for additional bearing elements at the ends and enhancing structural strength and fluid flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If bearings are disposed only at opposite axial ends of the roll, then the structure is simple, but the roll cannot support high speeds and considerable lengths due to inadequate structural strength and stiffness
Solution Approach 1:
The bearing support is segmented into multiple distributed locations along the roll length rather than concentrated at ends. Bearing elements are positioned at multiple axial locations to provide distributed support, increasing structural strength and stiffness while maintaining operational simplicity
Solution Approach 2:
The bearing arrangement transitions from a two-point support system (axial ends only) to a distributed multi-point support system along the axial dimension. This dimensional expansion of bearing locations provides enhanced structural support for high-speed, long-length roll operations
2Ease of operation
If suction or pressure boxes are used to provide fluid to the roll periphery, then fluid application is possible, but the structure lacks sufficient stiffness and strength for high-speed operation
Solution Approach 1:
The fluid valving arrangement is nested within the hollow interior of the roll. The inner tube containing the valving arrangement is positioned concentrically within the outer roll structure, allowing fluid distribution while maintaining the roll's structural integrity and stiffness for high-speed operation
Solution Approach 2:
The inner tube acts as an intermediary structure that carries the fluid valving arrangement and fluid passages. This separate internal structure provides fluid application capability without compromising the outer roll's structural strength, allowing the roll to maintain stiffness while enabling sophisticated fluid control
3Productivity
If the roll length is increased for higher productivity, then more processing capacity is achieved, but fluid application becomes non-uniform and time lag increases
Solution Approach 1:
The fluid distribution system is segmented into multiple axial sections with independently controllable valving. This segmentation allows precise control of fluid application at different axial locations, maintaining uniformity across the entire roll length even as productivity increases
Solution Approach 2:
The fluid valving arrangement is positioned upstream within the roll interior to anticipate and control fluid distribution before it reaches the periphery. This preliminary positioning and control mechanism ensures uniform fluid application across the entire roll length, preventing time lag and non-uniformity even in extended rolls
4Adaptability or versatility
If multiple vacuum positions are required around the roll periphery, then sophisticated control is achieved, but the structure becomes more complex
Solution Approach 1:
The inner tube structure serves multiple functions simultaneously: it provides structural support, contains the fluid valving arrangement, houses fluid passages, and enables sophisticated multi-position vacuum control. This multi-functionality reduces overall system complexity while achieving the required control sophistication
Solution Approach 2:
The valving arrangement and fluid passages are nested within the hollow interior of the roll, utilizing the internal space efficiently. This nesting approach allows complex multi-position vacuum control mechanisms to be integrated without increasing external dimensions or overall structural complexity
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
Enables higher rotational speeds and longer roll lengths with improved fluid flow and vacuum distribution, reducing time lag and increasing operational efficiency and product quality.
Implementation Method 1
The inner tube defines an elongated vacuum plenum therewithin extending along the longitudinal axis beneath the elongated vacuum transfer zone, with the inner tube having at least one vacuum port disposed therein providing fluid communication between the vacuum transfer zone and the vacuum plenum
Implementation Method 2
a bearing arrangement having a plurality of bearing elements disposed along the vacuum transfer zone and angularly affixed to one of the inner and outer tubes providing operative bearing contact between the walls of the inner and outer tubes
Data Source
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AI summary
A processing roll (100; 200) having rotatable outer tube (102; 202) mounted on a non-rotatable inner tube (104; 204) by a fluid valving arrangement (106; 206), is provided. The fluid valving arrangement (106; 206) provides angularly controlled transfer of fluid between a cavity on the inside of the inner tube (104; 204) and ports (120; 220) distributed longitudinally along an outer surface of the outer tube (102; 202), while also providing distributed bearing support of either the outer tube (102; 202) on the inner tube (104; 204), or the inner tube (104; 204) on the outer tube (102; 202), at a plurality of locations along a longitudinal axis (108; 208) of the processing roll (100; 200).