Vacuum Roll Rotary Valve for Dynamic Profile Control
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Solution Overview
Problem
Existing vacuum rolls cannot dynamically change their vacuum profile while handling materials at high line speeds, limiting their ability to precisely control and handle flexible materials effectively.
Innovation Solution
A vacuum roll design featuring an inner rotor, intermediate stator, and outer shell roll with concentric axes, where the outer shell roll can oscillate and the vacuum can be selectively applied to different portions, allowing for dynamic adjustment of the vacuum profile through the use of drive mechanisms and fluid isolation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional vacuum rolls with stationary or simply rotatable manifolds are used, then the structure is simple and reliable, but the vacuum profile cannot be dynamically changed while handling materials at high line speeds
Solution Approach 1:
The patent implements a nested structure where an inner rotor containing vacuum manifolds is positioned within an outer shell roll. The inner rotor can rotate independently within the outer shell, allowing dynamic reconfiguration of vacuum aperture positions without changing the overall roll structure. This nested arrangement enables complex vacuum profiling capabilities while maintaining a relatively compact and integrated device design.
Solution Approach 2:
The patent introduces dynamic elements by making the inner rotor rotatable within the outer shell roll. This rotation capability allows the vacuum manifolds to dynamically change their angular position relative to the material being processed, enabling real-time adjustment of the vacuum profile. The dynamic mechanism includes drive means for rotating the inner rotor and control systems for adjusting rotation speed and position, transforming a static vacuum roll into an adaptable system.
2Manufacturing precision
If vacuum is applied to the entire circumference of the roll, then material handling is stable, but precise control and handling of flexible materials is limited
Solution Approach 1:
The patent applies local quality by providing different vacuum conditions at different circumferential positions of the roll. The outer shell roll includes circumferentially spaced aperture rows that can be selectively activated, and the rotatable inner rotor allows specific vacuum manifolds to be positioned at desired locations. This enables localized vacuum application to specific portions of the material, providing precise control for folding, shaping, or positioning operations while maintaining ease of operation through automated control systems.
Solution Approach 2:
The patent segments the vacuum system into multiple independent manifolds and aperture rows distributed around the roll circumference. Each manifold can be independently controlled for vacuum application, and the aperture rows are divided into multiple circumferential zones. This segmentation allows the operator to activate only the necessary vacuum zones for a given operation, improving precision while simplifying control by breaking down the complex vacuum profiling task into manageable independent segments.
3Productivity
If high line speeds are used for material handling, then productivity increases, but the ability to change vacuum profile dynamically is reduced
Solution Approach 1:
The patent replaces traditional mechanical vacuum control mechanisms (such as multiple stationary manifolds requiring physical repositioning or complex valve systems) with a rotating inner rotor system. The rotation of the inner rotor can be precisely controlled through drive means, allowing rapid reconfiguration of vacuum profiles without mechanical repositioning of entire manifold assemblies. This substitution enables dynamic vacuum profiling that keeps pace with high line speeds, maintaining both productivity and adaptability.
Solution Approach 2:
The patent utilizes periodic rotation of the inner rotor to dynamically adjust vacuum profiles during material processing. By controlling the rotation speed and position of the inner rotor, the system can periodically apply vacuum to different circumferential zones in a controlled sequence. This periodic action allows the vacuum profile to be dynamically changed multiple times during a single material pass, maintaining adaptability even at high line speeds where rapid reconfiguration is needed.
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 precise control and handling of materials at high line speeds, reducing material damage and deformation by allowing for real-time adjustments in vacuum pressure, thereby improving the accuracy and repeatability of folding processes.
Implementation Method 1
One or more stationary vacuum manifolds are disposed within the interior space and operatively connected to a vacuum source. Vacuum can be selectively applied to one or more of the vacuum manifolds by operating the vacuum source.
Implementation Method 2
The inner rotor defines an open portion and a closed portion and is adapted to rotate within the intermediate stator. The rotation of the inner rotor operates to alternatingly align the open portion of the inner rotor with the open portion of the intermediate stator and to alternatingly block fluid communication between the interior chamber and the open portion of the intermediate stator.
Data Source
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AI summary
A vacuum roll includes an inner rotor, an intermediate stator, and an outer shell roll. The inner rotor has open and closed portions and is adapted to rotate within the intermediate stator which is rotationally fixed and also has open and closed portions. The outer shell roll has open and closed portions and is adapted to move around the intermediate stator. Together the inner rotor and the intermediate stator define an internal rotary valve interface adapted to control fluid communication between the interior chamber and the outer shell.