Pipeline inner wall morphology and center axis straightness measuring device and method

Abstract

The invention relates to the technical field of photoelectric detection, and relates to a pipeline inner wall morphology and center axis straightness measuring device and method which can measure the pipeline inner wall 3D morphology and the center axis straightness simultaneously, output and display a result and acquire accurate pipeline inner wall morphology data, thereby accurately restoring the pipeline inner wall morphology, and improving the measurement accuracy of the pipeline inner wall morphology and the center axis straightness. The pipeline inner wall morphology and center axis straightness measuring device and method provided by the invention are implemented by the aid of a pre-conditioning device, a laser scanning module, a position and posture detection module and a driving module, wherein the laser scanning module and the position and posture detection module are in rigid connection, the relative positions are determined, a moderate expansion device is arranged, the two modules form a system detection device which is driven by a crawler to crawl continuously in a contact manner along the pipeline inner wall, and the laser scanning module is composed of a laser probe and a rotating motor; the position and posture detection module is composed of a pipe mouth laser group, a posture detector group and a stay wire displacement sensor; and the driving module comprises a crawler. The pipeline inner wall morphology and center axis straightness measuring device and method mainly applied to occasions of pipeline photoelectric detection.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to the measurement of the shape of the inner wall of a pipeline and the straightness of a central axis. Background technique [0002] With the progress of national economy and science and technology, various pipelines are widely used in many fields, such as military, metallurgy, petroleum and chemical industry. Corrosion, brittle fracture, cracks, creep and other damages may occur to the pipeline during use, and due to the constraints of the production environment and processing technology, some pipeline workpieces have a certain degree of curvature at the beginning of forming. The quality of pipelines is directly related to economic interests, and is even more related to safety issues in related application fields. Therefore, it is particularly important to conduct regular quality inspections on pipelines. [0003] Among them, the 3D shape of the inner wall of the ...

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Problems solved by technology

[0003] Among them, the 3D shape of the inner wall of the pipeline and the straightness of the central axis can most intuitively reflect the quality of the pipeline. However, the current detection system for the inner wall of the pipeline that has been disclosed cannot take into account both functions. It only measures the three-dimensional shape of the inner wall of the pipeline or only the central axis of the pipeline. Straightness, system design often has complex structure but single function

In addition, the data measured by the detection device is directly used as the final result, ignoring the influence of the device's own attitude deviation and local contact error, which makes the entire measurement system incomplete, the measurement method is not rigorous enough, and there are large errors in the measurement results

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