Accurate large-diameter pipe inner diameter measuring scale

Abstract

The invention discloses an accurate large-diameter pipe inner diameter measuring scale which comprises a measured pipe and a main measuring stick, wherein an extension bar is clamped on the top of themain measuring stick; the top of the extension bar is linked with a spring type displacement sensor; the upper surface of the spring type displacement sensor is mutually attached to the inner surfacewall of the measured pipe; the surface of the main measuring stick is positioned below a radial supporting leg adjusting center and connected with a radial supporting leg angle fixing plate by virtueof a radial angle fixing bolt; an outer surface on the other side of the main measuring stick is rotationally connected with an axial supporting leg adjusting center; and the surface of the main measuring stick is positioned above the axial supporting leg adjusting center and connected with an axial supporting leg angle fixing plate by virtue of an axial angle fixing bolt. According to the measuring scale disclosed by the invention, the main measuring stick and the inner surface wall of the measured pipe are subjected to zero-error contact from the radial direction and the axial direction, sothat stable installation of the measuring scale is ensured, and the measurement accuracy of the measuring scale is increased.

Description

technical field [0001] The invention relates to the technical field of pipe fitting measurement, in particular to a precision measuring ruler for the inner diameter of a large-diameter pipe. Background technique [0002] Large-diameter pipe fittings usually refer to pipe fittings with a diameter above DN250. Large-diameter pipe fittings mainly include large-diameter elbows, large-diameter flanges, large-diameter reducers, large-diameter official caps, etc., large-diameter pipes (such as concrete pipes, copper The control of the inner diameter of steel pipes, etc.) is related to the installation and construction of pipe fittings, and is an important control index of pipe fittings. [0003] At present, the measuring tools used in the inspection mainly include inner micrometer and precision π ruler. Since the true diameter of the pipe diameter cannot be found when using the inner micrometer to measure, it is troublesome to find a point during the measurement process, and the ac...

AI Technical Summary

Problems solved by technology

[0003] At present, the measuring tools used in the inspection mainly include inner micrometer and precision π ruler. Since the true diameter of the pipe diameter cannot be found when using the inner micrometer to measure, it is troublesome to find a point during the measurement process, and the accuracy of the result is not high. At the same time, π is in the It is troublesome to use, and it also involves the inconvenience of finding the diameter, and requires an intermediate conversion process, so the result is not accurate

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