Adjustable Spring Foot for Chromatography Vibration Stability
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Solution Overview
Problem
Existing vibration isolation methods for vibration-sensitive instruments, such as chromatography separation instruments, fail to effectively dampen vibrations when lightly loaded while maintaining stability when heavily loaded, leading to instability and potential safety issues.
Innovation Solution
A spring foot assembly with an adjustable configuration that includes an upper housing, lower housing, shoulder bolt, and adjustment washer, allowing for a switch between spring-loaded and solid-loaded configurations based on weight, providing consistent spacing and a weight-based stop to stabilize the instrument.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If soft vibration isolation feet are used, then vibration damping is improved when lightly loaded, but stability deteriorates when heavily loaded
Solution Approach 1:
The foot assembly dynamically transitions between two configurations: a spring-loaded configuration for light loads that provides vibration isolation, and a solid-loaded configuration for heavy loads that provides stability. The system automatically adapts its mechanical properties based on the applied load weight.
Solution Approach 2:
The system changes its mechanical parameter (from compliant spring behavior to rigid solid behavior) based on the load weight. The adjustable spring constant and pre-load force allow the system to optimize its parameters for different loading conditions, transitioning from vibration isolation mode to stability mode.
2Stability of the object's composition
If hard vibration isolation feet are used, then stability is improved when heavily loaded, but vibration damping deteriorates when lightly loaded
Solution Approach 1:
The foot assembly dynamically transitions between two configurations: a spring-loaded configuration for light loads that provides vibration isolation, and a solid-loaded configuration for heavy loads that provides stability. The system automatically adapts its mechanical properties based on the applied load weight.
Solution Approach 2:
The system changes its mechanical parameter (from compliant spring behavior to rigid solid behavior) based on the load weight. The adjustable spring constant and pre-load force allow the system to optimize its parameters for different loading conditions, transitioning from vibration isolation mode to stability mode.
3Adaptability or versatility
If adjustable spring configuration is implemented, then adaptability is improved for different load weights, but device complexity increases
Solution Approach 1:
The foot assembly is segmented into distinct functional components: spring element, pre-load mechanism, adjustment mechanism, and housing. This segmentation allows for independent optimization of each component while maintaining overall simplicity and adjustability.
Solution Approach 2:
The system uses the applied load weight itself as the control signal to trigger the configuration transition. The weight-based stop and pre-load force create an automatic self-regulating system that requires minimal external control or complex sensing mechanisms.
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 solution effectively attenuates vibrations by up to four times and ensures stability by transitioning from a floating to a rigid state based on load, maintaining instrument balance and safety.
Implementation Method 1
a spring having a predetermined spring constant between the upper housing and the lower housing, the spring compressing when the force is applied to the upper housing
Implementation Method 2
The solution effectively attenuates vibrations by up to four times and ensures stability by transitioning from a floating to a rigid state based on load
Implementation Method 3
a lower housing constructed and arranged for positioning on a surface... comprising an anti-slip friction pad
Data Source
AI summary
An apparatus comprises a spring foot comprising an upper housing, a lower housing comprising an anti-slip friction pad, a shoulder bolt to provide consistent spacing, and an adjustment washer to adjust a weight-set point for switching between a spring-loaded configuration and a solid-loaded configuration. The upper housing cylinder is positioned a stop-distance from a flange of the lower housing in a spring-loaded configuration, resulting in a weight-based stop. The adjustment washer is adjustable between spring-loaded configuration to a solid-loaded configuration, based on the spring constant.