Seal Fin Tip Position Measurement Using Intermediary Jig
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Solution Overview
Problem
Existing methods for measuring the fin tip position of seal fins in steam turbines face challenges in accurately attaching reflectors, leading to impaired measurement accuracy and prolonged work times due to the need for frequent repositioning.
Innovation Solution
A fin tip position measurement method and system that utilize a jig with a flat measurement surface attached to the seal fin, allowing for precise laser scanning and calculation of the fin tip position by adding the jig's radial dimension to the measured distance, enabling easy and accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reflector is attached to the tip of a seal fin for measurement, then the fin tip position can be measured, but the attachment is unstable and measurement accuracy is impaired
Solution Approach 1:
A jig is introduced as an intermediary device between the seal fin and the measurement system. The jig has a holding portion that securely clamps the seal fin tip, and a measurement surface that serves as the laser reflection target. This intermediary structure provides both stable attachment to the fin and a reliable measurement surface, resolving the contradiction between attachment stability and measurement accuracy.
2Measurement precision
If multiple reflectors are repositioned to measure the entire region, then complete coverage is achieved, but work time is prolonged
Solution Approach 1:
The jig is designed as a universal measurement tool that can be applied to multiple seal fins and various measurement positions. The standardized jig design allows operators to quickly attach and measure different fins without needing to reposition multiple specialized reflectors, achieving complete region coverage while significantly reducing measurement time.
3Measurement precision
If a reflector is used for measurement, then the measurement can be performed, but frequent repositioning is required which reduces productivity
Solution Approach 1:
The jig is pre-configured with the measurement surface positioned at a known distance from the seal fin tip. This preliminary setup eliminates the need for frequent repositioning during measurement, as the jig itself provides the reference framework. The pre-established geometric relationship between the holding portion and measurement surface enables efficient measurements while maintaining precision.
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
This approach allows for stable and accurate measurement of fin tip positions, reducing measurement time and improving accuracy by simplifying the attachment process and reducing the need for multiple reflector placements.
Implementation Method 1
measuring a distance from the axis to the measurement surface by scanning the measurement surface with laser
Data Source
AI summary
This fin tip position measurement method comprises: a jig installation step for installing a jig having a flat measurement surface expanded in a circumferential direction and an axial direction to a tip of at least one among a plurality of seal fins that protrude in a radial direction with respect to an axial line, extend in the circumferential direction, and are arranged in a direction in which the axial line extends; a first measurement step for measuring a distance from the axial line to the measurement surface by scanning the measurement surface with a laser beam; and a first calculation step for calculating a distance from the axial line to the tip of the seal fin by adding a radial dimension of the jig to the distance to the measurement surface.