Screw Driving Torque Release for Axial Force Estimation
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Solution Overview
Problem
Existing technologies do not provide a method for determining screw driving failures by estimating the axial force of a screw.
Innovation Solution
A screw driving device that includes a rotary tool, a first motor, and a control part to apply and release torque, estimating the axial force based on the change in rotation position of the first motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If axial force measurement is implemented directly, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary approach by using rotation position change as a mediator to indirectly measure axial force. Instead of directly measuring the axial force with complex sensors, the system measures the rotation position change of the first motor during torque release, which correlates with the axial force generated by the screw. This intermediary measurement method achieves accurate axial force determination while avoiding the complexity of direct force measurement devices.
Solution Approach 2:
The patent replaces a direct mechanical force measurement system with a rotational position measurement system. By substituting the mechanical force sensor with an encoder or rotation detection mechanism that measures the rotation position change of the motor shaft during torque release, the system achieves axial force measurement through rotational dynamics rather than direct mechanical force sensing, thereby reducing device complexity.
2Ease of operation
If axial force estimation method is implemented, then ease of operation is improved, but measurement precision may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where the control part continuously monitors the rotation position of the first motor during the torque release step and uses this feedback information to estimate the axial force. The system applies predetermined torque to drive the screw, then releases the torque and measures the resulting rotation position change, using this feedback to determine the axial force generated during screw driving operations.
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 estimation of the axial force of the screw without directly measuring it, facilitating easy determination of screw driving quality.
Implementation Method 1
a first motor that drives the rotary tool to rotate
Implementation Method 2
applies a predetermined torque generated by the first motor to the screw in a rotation direction where the screw is driven, then performs a step of releasing the torque, and estimates an axial force of the driven screw based on a change of a rotation position of the first motor in the step of releasing the torque
Data Source
AI summary
According to the present invention, an axial force of a screw which is generated by screw driving is estimated. A control part applies a predetermined torque generated by a rotation axis servomotor to a screw in a rotation direction where a screw is driven, and thereafter releases the torque. The control part then estimates an axial force of the driven screw based on fluctuation of a rotation position of the rotation axis servomotor which occurs due to the release of the torque.