Threaded Member Tension Detection via Sensor Recess
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Solution Overview
Problem
Existing threaded members, such as bolts and nuts, lack precision in detecting axial extension force or tension, which is crucial for high-precision applications and security in construction and scientific instruments, as conventional methods rely on deformation detection that may not accurately reflect tightening force.
Innovation Solution
A threaded member design featuring receiving recesses on the thread surface with integrated sensor members that detect tension in the axial direction, allowing for precise measurement of extension force and enhancing the precision of tightening force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is disposed on the bolt or screw to detect deformation, then the tightening force can be detected, but the measurement precision is insufficient for high-precision applications
Solution Approach 1:
The patent replaces conventional deformation-based sensing with a tension wire mechanism that directly measures axial tension through wire extension. This mechanical substitution provides more precise tension detection by converting the complex deformation measurement into a simple linear extension measurement of the tension wire, thereby improving measurement precision while maintaining manageable device complexity
Solution Approach 2:
The tension wire acts as an intermediary element between the threaded member and the sensor. It transfers the axial tension force from the threaded member to the sensor, enabling precise measurement of the tightening force. This intermediary mechanism isolates the sensor from direct contact with the threaded member, simplifying the overall device structure while enhancing measurement capability
2Reliability
If conventional deformation detection is used, then the tightening force can be estimated, but the detection accuracy does not meet high-security construction requirements
Solution Approach 1:
The patent replaces indirect deformation detection with direct tension wire extension measurement. The tension wire is anchored to the threaded member and extends axially with the member, providing a direct mechanical representation of the axial tension force. This substitution significantly improves detection reliability by eliminating the complexity of interpreting multi-axis deformation data
Solution Approach 2:
The patent changes the measurement parameter from complex multi-dimensional deformation to simple one-dimensional wire extension. By monitoring the length change of the tension wire rather than interpreting strain gauge data from multiple directions, the system achieves more reliable and easier-to-interpret tension measurements that meet high-security construction requirements
Data Source
AI summary
A threaded member has an axial direction. A thread is formed on the threaded member in the axial direction. At least one receiving recess is formed on a circumferential surface of the thread of the threaded member. At least one sensor member is disposed in the receiving recess for detecting tension applied to the threaded member in the axial direction. When a tightened article is tightened by the threaded member, an extension force/tension is applied to the threaded member in the axial direction. The sensor member is positioned in adjacency to the thread of the threaded member so that the sensor member can precisely detect the extension extent of the threaded member for precisely obtaining the tightening force applied to the threaded member.