On-line measuring method and device for outer diameter and ovality of large-diameter steel pipe end

Abstract

The invention relates to the field of steel pipe outer diameter and ovality measurement, particularly to an on-line measuring method and device for the outer diameter and the ovality of a steel pipe end. The on-line measuring method for the outer diameter and the ovality of large-diameter steel pipe end is as follows: obtaining the nominal data of a to-be-measured steel pipe for determining the axis position, setting the interval for an outer diameter laser displacement sensor, enabling a probe of the sensor to be directed at the axis for measurement and then obtaining the diameter D of the to-be-measured steel pipe, rotating the sensor for 180 degrees for measuring the outer diameter in the all peripheral direction, and obtaining the average diameter and ovality of the to-be-measured steel pipe. The on-line measuring device for the outer diameter and the ovality of large-diameter steel pipe end is characterized by including an industrial robot, an outer diameter measuring device and an axis detecting device. The standard industrial robot is adopted for carrying the measuring device and arranged around the to-be-measured steel pipe end, the non-contact measuring technology is adopted for measurement, and the on-line measuring device has high precision and speed, and excellent popularization and application prospect.

Description

technical field [0001] The invention relates to the field of measuring the outer diameter and ellipticity of a steel pipe, in particular to an online measuring method and device for the outer diameter and ellipticity of a steel pipe end. Background technique [0002] The size and shape error of the end of the large-diameter longitudinal welded pipe is one of the important indicators for testing its quality. It is related to whether the steel pipe can successfully complete the pipe welding, and it is of great significance to the construction progress and quality of the pipeline. With the continuous progress of pipeline on-site welding construction technology and the continuous application of semi-automatic and fully automatic welding technology, more and more stringent requirements are put forward for the outer diameter and roundness of the steel pipe end. For example, in the steel pipe technical specifications of the West-to-East Gas Pipeline Project, it is required that the...

AI Technical Summary

Problems solved by technology

[0006] The laser projection method has a high measurement accuracy and a high degree of automation. The disadvantage is that the device is complex and occupies a large area. Corresponding to steel pipes of different specifications, the distance between the two sets of laser sensors needs to be readjusted and calibrated, and the operation requirements are high.

Moreover, factors such as vibration, swaying, and eccentricity that may exist during the rotation of the steel pipe will cause actual measurement errors, which are not easy to overcome

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