Optical automatic inner diameter measuring system and method for heat transfer tube expanding area

The optical automatic inner diameter measurement system solves the problem of cumbersome measurement of the inner diameter of the heat transfer tube expansion joint area, realizes efficient and accurate judgment of expansion joint quality, supports multi-probe collaborative detection and full-coverage measurement, and reduces human error and installation difficulty.

CN122149348APending Publication Date: 2026-06-05CHINA NUCLEAR POWER OPERATION TECH CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NUCLEAR POWER OPERATION TECH CORP
Filing Date
2026-01-20
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In the existing technology, measuring the inner diameter of the expansion joint between the heat transfer tube and the tube sheet of the steam generator is cumbersome, time-consuming and labor-intensive. The manual measurement method is greatly affected by human factors and it is difficult to efficiently and accurately judge the quality of the expansion joint.

Method used

An automatic optical inner diameter measurement system is adopted, including an optical probe, an optical probe pusher, a robotic arm, and a host computer. The automatic inner diameter measurement of the expansion zone of the heat transfer tube is realized through the positioning of the robotic arm and the pusher of the optical probe. Combined with the control and data management of the host computer, multi-probe collaborative detection and full-area inner diameter measurement are realized.

Benefits of technology

It enables efficient and accurate inner diameter measurement of the expansion zone of heat transfer tubes, reduces human error, improves measurement efficiency, can automatically determine whether there are defects in the expansion zone, supports modular quick-connect installation and real-time recording, and covers all tube holes.

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Abstract

The present disclosure belongs to the technical field of nuclear power and particularly relates to an optical automatic inner diameter measuring system and method for a heat pipe expansion zone. The system of the present disclosure is compact in structure and convenient to install, integrates a mechanical arm, a tube plate positioning seat and a motion controller, and can realize cooperative detection of double probes or multiple optical probes. The optical probe can complete full-depth and multi-direction inner diameter measurement of the expansion zone at one time, automatically judge defects and record the tube number. The guide sleeve is self-adaptive to different pipe diameters, ensuring the concentricity of the probe and the pipe hole. By replacing the positioning seat, all pipe holes of the tube plate can be covered, and the system has a coordinate calibration function to avoid cumulative errors. The system supports modular quick connection installation, and the upper computer records hole information in real time, distinguishes detection states, and efficiently positions and measures the line of sight.
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