A method for detecting the out-of-roundness of the mouth of a large-diameter elbow

Abstract

The invention belongs to the technical field of out-of-roundness detection of the mouth of a large-diameter elbow, and specifically discloses a method for detecting the out-of-roundness of the mouth of a large-diameter elbow: Step 1, taking pictures of the mouth image of the elbow; Step 2, bending Preprocessing of the image of the nozzle of the pipe; Step 3, calculation of the maximum diameter and minimum diameter of the elbow nozzle; Step 4, calculation of the out-of-roundness of the elbow nozzle; Step 5, obtaining the circle calibration suggestion. This method for detecting out-of-roundness of the mouth of a large-diameter elbow greatly improves the detection efficiency of the out-of-roundness of the mouth of the elbow, and at the same time improves the convenience of detecting the out-of-roundness of the mouth of the elbow, reducing the Reduce the number of people employed in the out-of-roundness detection of the bend pipe mouth, improve the accuracy of the out-of-roundness detection of the bend pipe mouth; at the same time provide the specific number of rounding times and reference rounding values ​​for the rounding process of the bend pipe mouth , reducing the rounding times of the bend pipe mouth.

Description

technical field [0001] The invention relates to the technical field of detecting the out-of-roundness of the mouth of a large-diameter elbow, in particular to a method for detecting the out-of-roundness of the mouth of a large-diameter elbow. Background technique [0002] In the pipeline engineering of petroleum, chemical industry, natural gas transmission, metallurgy, nuclear power plant, and heat supply industries, there are a large number of pipe butt welding work such as straight pipes and curved pipes. The out-of-round pipe opening will significantly reduce the welding quality and seriously affect the transmission pipeline. service life. Long-term statistical results at home and abroad show that the failure rate of bent pipes is significantly higher than that of straight pipes. Sustaining and its internal stress will cause the nozzle to be out of round, resulting in unqualified roundness of the nozzle of the elbow. On the other hand, it is related to the pipeline oper...

AI Technical Summary

Problems solved by technology

Under normal circumstances, most of the domestic methods for calibrating the out-of-roundness of large-diameter elbows adopt relatively primitive methods, such as: placing a jack on the edge of the inner wall of the nozzle, and manually operating the top to apply pressure to correct the circle. The out-of-roundness detection method is very simple, mainly using the measuring ruler measurement method, which needs to take different measurement points from the circumference of the nozzle, not only the production efficiency is low, but also the detection results are only qualitative concepts without quantitative conclusions, and the product quality cannot be guaranteed. ensure

The roundness method of this kind of roundness correction method is not only labor-intensive and low in work efficiency, but also directly leads to low production efficiency, cumbersome and complicated procedures, high energy consumption, high labor costs, and low product precision due to backward detection methods. question

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