Ellipticity measuring instrument for tube body and measurement method thereof

Abstract

The invention provides an ellipticity measuring instrument for a tube body and a measurement method thereof. The measuring instrument comprises a rigid semi-sphere, a contact end and a scale micrometer, wherein the contact end and the scale micrometer are arranged at two semicircular ends of the rigid semi-sphere respectively; the measurement directional line of the scale micrometer is on the same straight line as the contact end, and the straight line passes through the center of the rigid semi-sphere; the diameter of the rigid semi-sphere is equal to the sum of the distance between the contact end and the rigid semi-sphere, the distance between a measurement contact of the scale micrometer and the rigid semi-sphere, and the diameter of a tested tube body. The ellipticity measuring instrument is convenient to use, simple in structure, high in precision and measurement efficiency, low in work intensity and wide in detection coverage, can cover the ellipticities of all steel tubes with various specifications and calibers and solves the problem of ellipticity measurement of the tube body.

Description

technical field [0001] The invention relates to the technical field of instruments in the steel pipe manufacturing industry, in particular to a measuring instrument for measuring the ellipticity of a pipe body and a measuring method thereof. Background technique [0002] In the prior art, the ellipticity of the steel pipe body for oil and gas transportation is less than Due to the small diameter of the steel pipe, it is usually difficult to manually drill into the inner wall of the steel pipe, and it is difficult to measure. So far, there is no good measurement method or instrument to solve this problem. For pipe diameters greater than or equal to The steel pipe is usually manually drilled into the inner wall of the steel pipe and measured with an inner diameter micrometer or a tape measure. The labor intensity is high, and the measurement error of the tape measure is relatively large. However, it is difficult to ensure that the two ends of the inner diameter micrometer ar...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the ellipticity of the steel pipe body for oil and gas transportation is less than Due to the small diameter of the steel pipe, it is usually difficult to manually drill into the inner wall of the steel pipe, and it is difficult to measure. So far, there is no good measurement method or instrument to solve this problem. For pipe diameters greater than or equal to The steel pipe is usually manually drilled into the inner wall of the steel pipe and measured with an inner diameter micrometer or a tape measure. The labor intensity is high, and the measurement error of the tape measure is relatively large. However, it is difficult to ensure that the two ends of the inner diameter micrometer are on the same level, which is easy to cause mismeasurement (usually the measurement results too large), low efficiency

Images