System and method for measuring section shape and size of heavy caliber steel pipe

Abstract

This invention discloses such a measurement and method of a large caliber steel tube cross-section shape, which belongs to the domain of geometric measurement technique. The measurement system of information processing mode and measurement mode is located in the small moving car, with the small car moving on the datum circular orbit. The input and output mode connect the information processing mode through the serial port. The measurement method is like this: testing a series of the steel tube surface and the radial distance of a certain known datum circular orbit radius in order to get a configuration point coordinates of the steel tube cross-section. When the amount of sampling points is abundant enough, we can get the accurate outline of steel tube. Then the information-processing mode counts the steel tube cross-section shape and dimension parameter.

Description

technical field [0001] The invention belongs to the technical field of geometric quantity measurement, and in particular relates to a large-diameter steel pipe cross-sectional shape dimension measurement system and a measurement method. Background technique [0002] Large-diameter steel pipes refer to steel pipes with a diameter of 0.5 meters to 3 meters. They can be spiral seam steel pipes or straight seam steel pipes. Large-diameter steel pipes are mostly used in oil or natural gas transportation projects. The cross-sectional geometry and size of large-diameter steel pipes are an important inspection parameter in the quality of steel pipe products, mainly including maximum and minimum diameters, roundness errors, etc. The above parameters have an important influence on the pipe end butt welding construction during the pipeline laying process and the stress state of the steel pipe during service. [0003] Most of the current steel pipe production plants manually measure th...

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Problems solved by technology

The main shortcomings of these measurement methods are: the method of calculating the diameter by the circumference is carried out under the condition that the steel pipe section is a default circle, which cannot reflect the roundness error or ellipticity of the section and other parameters; the measurement of the tape measure is not easy to guarantee the actual measurement The cross-section is perpendicular to the busbar of the steel pipe, and if the tape measure is not tightened, the measurement result will be too large; when there are recesses on the steel pipe surface, the measurement of the circumference of the tape measure will be too small; the caliper can only measure a section of the chord length of the steel pipe section, but not The method of measuring the real diameter and calculating the circumference by diameter is affected by the cross-sectional shape of the steel pipe; manual measurement is easily affected by human subjectivity, and the measurement stability and objectivity are poor

However, this system has obvious shortcomings: the measurement principle of the system believes that the cross section of the steel pipe is circular or elliptical, but the real steel pipe cross section is not an ideal circular or elliptical; Measurement of several points on the steel pipe surface cannot fully reflect the size and shape of the entire section

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