Torque Wrench Calibration Structure for Tangential Force Control
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Solution Overview
Problem
Existing calibration devices for torque wrenches apply force to the wrench handle in a manner that is not tangent to its trajectory, leading to inconsistent measurements due to varying force components during rotation, violating the UNI ISO 6789 standard's requirement for a constant radial force application.
Innovation Solution
A calibration device with a mechanical structure that ensures the force applied to the wrench handle is always tangential to its curved trajectory, using a sliding mechanism with a worm mechanism to maintain a constant radial distance and a pivoted handle attachment, allowing the wrench to rotate while being constrained to a support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a sliding mechanical structure is used to apply force to the wrench handle, then the wrench can be rotated for calibration, but the force application point is not tangent to the trajectory causing measurement inaccuracy
Solution Approach 1:
The patent employs a curved guide rail with a specific arc shape that matches the trajectory of the wrench handle during rotation. This curved geometry ensures that the force application point remains tangential to the wrench trajectory throughout the rotation, resolving the contradiction between enabling wrench rotation and maintaining measurement accuracy.
Solution Approach 2:
The patent introduces an intermediary mechanical linkage system consisting of a slider, guide rail, and connecting arm that mediates between the linear motion of the calibration force and the rotational motion of the wrench. This intermediary mechanism transforms the applied force into a tangential force along the wrench trajectory, ensuring accurate torque measurement while maintaining operational capability.
2Device complexity
If the force application point is not maintained at a constant radial distance, then the mechanical structure is simpler, but the force component varies during movement violating UNI ISO 6789 standard
Solution Approach 1:
The curved guide rail is designed with a specific radius of curvature that maintains a constant radial distance from the wrench rotation center. This geometric constraint ensures that the force application point remains at a constant radius throughout the rotation, satisfying the UNI ISO 6789 standard while managing structural complexity through elegant geometric design.
Solution Approach 2:
The patent employs a dynamic mechanical linkage that automatically adjusts the force application point position during rotation. The slider moves along the curved guide rail in a way that dynamically maintains the constant radial distance requirement, allowing the system to adapt to the rotational motion while ensuring standard compliance.
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
Ensures accurate and consistent torque measurements by maintaining a constant radial force application, adhering to the UNI ISO 6789 standard, thereby improving measurement precision and adherence to quality protocols.
Implementation Method 1
movement means, which can be manual or automatic (motorized). In the embodiment shown, such means are made by means of a worm mechanism in which a crank 6 rotates a worm 61 which penetrates a threaded hole 51 of the support 5.
Data Source
AI summary
A calibration device for dynamometric tools including a sliding mechanical structure associated with a frame of a test bench, which allows to impart a force and a controlled rotation in such a torque tool, said tool having its clamping tool engaged in a brake placed on the bench. The mechanical structure includes a pair of longitudinal bars which can be connected to the bench, on which at least one guide is mounted transversely, on this guide there is a support which slides in the transverse direction and is provided with a constraint for the tool body, so that the tool is pivoted on the brake with its tool head and can rotate to simulate a tightening of the brake F when the support is moved along this guide.