Automatic detection equipment for ovality of pipeline as well as detection method thereof

Abstract

The invention relates to automatic detection equipment for ovality of a pipeline as well as a detection method thereof. The detection equipment comprises an industrial robot and a V-shaped device usedfor fixing the pipeline, the industrial robot is connected with an industrial control computer in a communication way, the tail end of the industrial robot is connected with a laser ranging device, and the industrial control computer controls the industrial robot to act and receive data acquired by the laser ranging device in the communication way. The detection method comprises the following steps: firstly, automatically adjusting attitude by the industrial robot, so that the laser ranging device can enter the pipeline and is vertical to a measured surface of a vertical pipeline; secondly, inserting the laser ranging device into the pipeline and rotating for one circle by virtue of the tail end of the industrial robot, measuring coordinate values of multiple points in circumferential direction, and storing a calculation result in the industrial control computer; and thirdly, calculating and fitting an elliptical curve by virtue of the industrial control computer, and obtaining lengthdata of a long axis and a short axis of the elliptical curve. The detection equipment provided by the invention fits the elliptical curve for obtaining the ovality in a way of measuring the multiplecoordinate points inside the pipeline, measurement accuracy and efficiency are higher, and operation is simpler.

Description

technical field [0001] The invention relates to the technical field of detection of large-diameter pipelines, in particular to an automatic detection device for pipeline ellipticity and a detection method thereof. Background technique [0002] As we all know, a pipeline is a device connected by pipes, pipe connectors and valves to transport fluids such as gas and liquid. Pipes are widely used, and large pipes are also an important part of pipe products. As an important parameter index of the end of large pipes, ovality is of great significance to ensure the progress and quality of pipeline construction. [0003] With the continuous improvement of pipeline construction technology on site, the requirements for the diameter of large pipelines are also increasing, especially for the pipe ends, the ovality requirements are extremely strict, because when two pipelines are welded in the field or in the ocean, if The ellipticity of the pipe end of the large pipe meets the requireme...

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Problems solved by technology

[0004] At present, traditional manual measuring tools such as calipers and micrometers are greatly affected by the production environment, the accuracy of the measuring tools and the factors of the operator. The measurement accuracy is low, the speed is slow, the efficiency is low, the labor intensity of the workers is high, and the ovality of the pipeline cannot be accurately reflected. The invention patent with the Chinese patent number CN102650516B discloses a method and device for online measurement of the outer diameter and ellipticity of the steel pipe end. First, the nominal data of the steel pipe to be tested is obtained, and then the axis position is measured; then the outer diameter laser displacement sensor is set. Align the probe of the sensor with the center of the shaft, start measuring, get the diameter D of the steel pipe to be tested, and rotate it 180 degrees to get the outer diameter of the full circumference, and get the average diameter and ellipticity of the steel pipe to be tested by calculation; its online measurement The device includes an industrial robot, an outer diameter measuring device and a shaft center detection device

[0005] However, the above-mentioned detection device is only used to detect the outer diameter of the pipeline, and cannot be applied to the detection of the inner diameter of the pipeline or the detection of steps in the pipeline. At the same time, it moves the measurement by identifying the axis of the pipeline, and the accuracy of the axis alignment is also related to the measurement. The accuracy of the center of the axis in the above detection method is obtained by finding the intersection of two vertical lines, which has low accuracy and low efficiency, and the sensor directly measures the maximum and minimum values ​​of the outer diameter of the pipe to obtain the ellipticity. The accuracy is low, the accuracy is poor, the operation is cumbersome, and it takes a long time

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