Load-Sensing Nut Structure for Accurate Fastener Tension
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Solution Overview
Problem
Existing fastening technologies face challenges in accurately determining and monitoring the axial pressure applied, leading to issues of over-tensioning or under-tensioning, which can result in ineffective connections or buckling of fasteners, and are often limited to specific fastening methodologies.
Innovation Solution
A nut device with a deformation measurement device, such as a strain gauge, integrated into its body, which measures deformation to determine the applied load, allowing for precise monitoring of tension and preventing buckling by correlating deformation with axial force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If force is applied to fasten workpieces, then the connection strength is improved, but over-application of force causes buckling of the fastener leading to disengagement
Solution Approach 1:
The patent incorporates a deformation measurement device (such as a strain gauge) that provides real-time feedback on the axial pressure applied to the fastener. This feedback mechanism allows the system to monitor the force level and prevent over-tensioning by alerting operators when the measured deformation corresponds to buckling conditions, thus maintaining both connection strength and fastener integrity
Solution Approach 2:
The patent replaces subjective mechanical judgment of fastening adequacy with an objective measurement system. Instead of relying on operator experience or simple torque control, the system uses deformation measurement devices to directly measure the axial pressure on the fastener, substituting mechanical sensation with precise instrumental measurement to determine when optimal fastening is achieved
2Measurement precision
If deformation measurement device is integrated into the nut body, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the deformation measurement device with the nut body by integrating the measurement sensor directly into the nut structure. The measurement device is positioned to directly measure deformation of the nut body itself, combining the fastening function and measurement function into a single integrated component, thereby achieving high measurement precision without proportionally increasing overall device complexity
Solution Approach 2:
The nut body serves dual purposes: it performs the fastening function while simultaneously serving as the measurement platform. The deformation of the nut body itself is measured, allowing the structure to self-monitor its own stress state without requiring separate external measurement apparatus, thus reducing the complexity burden of adding measurement capabilities
3Productivity
If existing fastening technologies are used, then fastening operations can be performed, but they are limited to certain types of fastening methodologies
Solution Approach 1:
The patent designs the measurement system with universal applicability across different fastening methodologies. The deformation measurement device can be integrated into various fastening components (nuts, bolts, anchors) and works with different fastening techniques including mechanical expansion, chemical bonding, and threaded fastening, making the system versatile and adaptable to multiple fastening applications without requiring methodology-specific modifications
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 accurate and continuous monitoring of the load applied to fastening members, preventing over-tensioning and under-tensioning, and is compatible with various fastening methodologies, enhancing the reliability of fastening operations.
Implementation Method 1
a deformation measurement device being received or formed with the body... measuring deformation of the body and determine the load applied
Data Source
AI summary
The present invention relates to a nut device comprising a body comprising a first surface and second surface connected by an outer wall and by a central threaded aperture with female threads for engaging an elongate fastening member; and a deformation measurement device being received or formed with the body. The present invention allows for more accurate determination of force applied to a fastener.