Magnetic Ejector Capping Head for Aseptic Contamination Control
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Solution Overview
Problem
Existing capping heads face contamination risks and increased complexity due to ejection rods passing through the moving assembly, leading to wear and unwanted cap ejections, while solutions like confined ejector members increase weight and moment of inertia, complicating the structure and performance.
Innovation Solution
A capping head with a magnetic ejector member housed inside the gripping assembly, using magnetic elements with the same polarity at different axial heights to transfer axial thrust without contact, reducing wear and moment of inertia, and eliminating the need for external abutments, thus maintaining aseptic conditions and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ejection rod is used to eject caps from the gripping assembly, then caps can be removed when capping operation is not performed, but the ejection rod passes through the moving assembly causing contamination risk between the aseptic gripping assembly and the non-aseptic moving assembly
Solution Approach 1:
The invention extracts the ejection function from the moving assembly by providing a dedicated ejection assembly that is hermetically separated from the gripping assembly. The ejection rod is now contained within the ejection assembly rather than passing through the gripping assembly, eliminating the contamination pathway while maintaining the cap ejection function.
Solution Approach 2:
The capping head is segmented into distinct hermetic zones: the gripping assembly housing containing the cap receiving seat and gripping elements, and the ejection assembly containing the ejection rod. This segmentation allows independent control of aseptic conditions in each zone while maintaining functional integration.
2Reliability
If a confined ejector member is used within the gripping assembly to avoid contamination, then aseptic conditions are maintained, but the gripping assembly weight and moment of inertia increase considerably
Solution Approach 1:
The ejection function is extracted from the gripping assembly and placed in a separate ejection assembly. This removes the weight of the ejection mechanism from the rotating gripping assembly, reducing its moment of inertia and improving dynamic performance while maintaining aseptic separation.
3Ease of operation
If an ejection rod passes through the moving assembly to eject caps, then caps can be removed, but wear occurs on the ejection rod and surrounding assemblies
Solution Approach 1:
The ejection rod and its wear-prone contact points are extracted from the gripping assembly and placed in a separate ejection assembly. This isolates the wear mechanism to a dedicated component that can be independently maintained or replaced, extending the service life of the gripping assembly.
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 magnetic ejector system effectively ejects caps without contaminating the gripping assembly, reducing wear and unwanted ejections, while maintaining a compact and lightweight design that improves operational performance and adheres to aseptic conditions.
Implementation Method 1
magnetic elements with the same polarity at different axial heights to transfer axial thrust without contact
Data Source
AI summary
A capping head for applying caps on containers or bottles and a capping assembly are provided. The capping head comprises a gripping assembly having a hollow body longitudinally extending along a vertical axis and internally defining a seat for the cap, the seat being delimited at its lower end by an inlet mouth for the introduction of the cap. A moving assembly is connected to the gripping assembly for controlling the movements thereof and is hermetically separated therefrom, and an ejector member is housed inside the hollow body of the gripping assembly, in such a manner that it is free to axially slide. The ejector member carries first and second magnetic elements such that a relative axial approach of the second magnetic element towards the first magnetic element results in a translation of the ejector member towards the lower inlet mouth of the gripping assembly.