Telescopic Output Shaft Feedback for Axial Force Control
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Solution Overview
Problem
Existing torque delivering power tools lack the ability to effectively control and monitor the axial force applied to a work piece, particularly with telescopic shafts, where the pressure force is dependent on the shaft's position, leading to inconsistent and potentially damaging interactions with the work piece.
Innovation Solution
A torque delivering power tool with a telescopically arranged output shaft, equipped with a sensor to monitor axial position and a resilient member to maintain a desired axial compression force range, allowing for flexible positioning while ensuring consistent axial force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a telescopic output shaft is used to provide flexibility in axial positioning, then adaptability is improved, but control of axial force deteriorates because the pressure force becomes dependent on shaft position
Solution Approach 1:
A sensor monitors the axial position of the output shaft and provides feedback to a control unit, which adjusts the motor's operation to maintain the axial compression force within a desired range, resolving the contradiction between telescopic flexibility and force control reliability
Solution Approach 2:
The system dynamically adjusts the axial force based on the real-time position of the telescopic shaft, allowing the force to be optimized for each position rather than being fixed, thus maintaining both adaptability and control
2Strength
If axial force is increased to ensure good connection between tool implement and work piece, then connection strength is improved, but risk of workpiece damage increases
Solution Approach 1:
The control unit adjusts the axial compression force parameters dynamically based on shaft position and workpiece feedback, maintaining the force within an optimal range that ensures connection strength while preventing damage
Solution Approach 2:
The sensor provides feedback on axial position and compression force, allowing the control unit to prevent excessive force application that could damage the workpiece while maintaining sufficient connection strength
3Ease of operation
If axial force is manually supervised for handheld tools, then operator control is maintained, but productivity deteriorates due to manual intervention requirements
Solution Approach 1:
The system performs self-monitoring and self-adjustment of axial force through the sensor and control unit, eliminating the need for manual supervision while maintaining proper force levels, thus improving productivity without sacrificing operational control
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 continuous control of axial force within a specific range, preventing damage to the work piece and ensuring effective operation by providing real-time feedback through an indication unit, ensuring the axial force remains within acceptable limits during tightening operations.
Implementation Method 1
a resilient member having a known resilience in function of the extension is arranged to urge the output shaft towards the fully extended position
Implementation Method 2
a resilient member having a known resilience in function of the extension is arranged to urge the output shaft towards the fully extended position
Data Source
Figure 1~2
Figure 3~4
AI summary
A torque delivering power tool (10) including: - a motor, - a housing (11-15) - an input shaft (16), which is driven by said motor, - an output shaft (17), which is rotationally connected to the input shaft. A sensor (20) is arranged to monitor an axial compression force acting between the output shaft (17) and the input shaft (16). A resilient member (21) may be arranged to push the output shaft (17) outwards, wherein the sensor (20) may be arranged to monitor the axial extension of the output shaft (17) to thereby deduce the axial compression force.