Probe Holder Radial Motion for Constant Lift-Off
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Solution Overview
Problem
Existing in-line non-destructive testing methods for high-value alloy bars face challenges in maintaining constant lift-off distance due to eccentric rotation and non-perfect roundness, leading to detection errors and costly adjustments for different bar diameters, with prior solutions causing surface damage or rapid spacer wear.
Innovation Solution
A probe holder assembly with rollers and mechanical links that allow radial motion of the probe, using a soft spacer with reduced pressure and increased surface area to maintain constant lift-off, accommodating varying diameters and wear without adjustment, and ensuring inspection to the bar ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a hard spacer is used to maintain constant lift-off, then the lift-off distance is maintained, but the inspected surface is damaged by scratches
Solution Approach 1:
The spacer material is changed from hard to soft, fundamentally altering the material parameter to eliminate surface damage while maintaining lift-off distance through the compliance of the soft material
Solution Approach 2:
A soft intermediary spacer material is introduced between the probe and the inspected surface, allowing the probe to maintain constant lift-off without directly contacting and damaging the surface
2Object-affected harmful factors
If a soft spacer is used to avoid surface damage, then the surface is protected, but the spacer wears rapidly due to high speed relative motion
Solution Approach 1:
The probe holder assembly weight is applied to the roller system rather than the spacer, creating a counterbalancing effect that reduces the pressure and wear on the soft spacer material
Solution Approach 2:
The roller is introduced as an intermediary element that bears the brunt of the probe holder assembly weight, protecting the soft spacer from excessive pressure and wear
3Manufacturing precision
If the probe holder is customized for a particular bar diameter, then the lift-off is accurate for that diameter, but the device must be replaced or re-adjusted when bar size changes, disrupting production
Solution Approach 1:
The probe holder assembly is made dynamically adjustable through the roller mechanism, allowing it to adapt to different bar diameters without replacement or complex re-adjustment, maintaining productivity while ensuring accurate lift-off
Solution Approach 2:
The probe holder assembly is designed with universal compatibility for multiple bar diameters through the roller-based adjustment mechanism, eliminating the need for customized holders for each diameter
4Device complexity
If the probe position is fixed, then the structure is simple, but the probe cannot accommodate eccentric rotation or out-of-round bars, leading to detection errors
Solution Approach 1:
The probe is given dynamic movement capability through the roller mechanism, allowing it to adjust its position radially to accommodate eccentric rotation and out-of-round bars, improving measurement precision without excessive structural complexity
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
The solution maintains consistent lift-off distance without damaging the surface, reduces spacer wear, allows inspection across a range of diameters without adjustment, and ensures accurate detection even with eccentric rotation or out-of-round bars, while enabling inspection to the bar ends.
Implementation Method 1
two attached rollers and with mechanical links attaching a probe to the frame. The weight of the probe holder assembly rests on the rollers which are in contact with the surface of the bar to be inspected, and rotate in counter-rotation to the rotation of the bar
Data Source
AI summary
Disclosed is a probe holder for in-line inspection of the surface of bars of high value alloys. To attain full coverage of the inspected surface, the bar is rotated while either the bar or the probe holder is translated. The probe holder of the invention ensures constant probe lift-off by allowing the probe to move freely under its own weight, while constraining the motion to be only in the radial direction of the bar. The lift-off distance is defined by a spacer which is made of soft material to avoid damaging the inspected surface. Although the spacer is soft, its wear due to friction with the rotating bar is minimized by minimizing the pressure between the spacer and the bar. This is achieved by resting most of the mechanism weight on two rollers, with only the much smaller weight of the probe resting on the spacer.