Tape measure for out-of-roundness detection and method of use thereof

Abstract

The invention discloses a tape measure for out-of-roundness detection and a method for using the same, comprising a tape measure housing and a scale stretched inside the tape measure housing, hooks are provided at the end of the scale, a plurality of slots are provided on the scale, and a plurality of clamping slots are provided on the scale. The slots are arranged in parallel, and also include a movable magnet for fixing the tape measure on the surface of the measured object. The beneficial effects of the present invention are: through the slot provided on the scale, when the operator thinks that a certain place is the end point of the ellipse major axis of the pipeline, the hook is stuck in the slot, and the first fixation is realized through the hook; Fix the magnet for the second fixation, eliminating the need for manual fixation, which saves manpower and makes the measurement more accurate; through the setting of the fluorescent layer, the ellipticity of the pipeline can be accurately grasped even in a dark environment .

Description

technical field [0001] The invention relates to out-of-roundness detection of pipelines, in particular to a measuring tape for out-of-roundness detection and a method for using the same. Background technique [0002] For power plant boilers, the detection of out-of-roundness is an important indicator for inspecting the quality of pipe bends or elbows. In practice, the measurement method commonly used at present is caliper measurement: when measuring the maximum diameter, a pliers foot rests on the bend or elbow. On one side of the elbow, the other pincer slides along the circumferential direction of the pipe surface, and stops sliding when the distance between the two pincers reaches the maximum. Keep the opening size of the caliper unchanged, remove it from the pipe, and use a measuring ruler to measure out the two pincers. The distance between the feet is the measured diameter in one direction. The minimum diameter can be measured in the same way, the difference is that t...

AI Technical Summary

Problems solved by technology

[0004] 1) In actual work, when testing in a dark place, it is usually necessary to use an external light source for illumination to perform detection. If there is no external light source or the external light source is weak, it will directly affect the accuracy of the measurement;

[0005] 2) Because the measuring tape measures the pipe, if the diameter of the pipe is large, a worker must not only fix the measuring tape but also operate the snap gauge, which is very inconvenient

[0006] 3) Because the positions of the tape measure and the caliper are not on the same roundness, the measurement accuracy is inaccurate

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