Vernier caliper internal measuring claw reading accuracy detection fixture and detection method

Abstract

The invention provides a vernier caliper internal measuring claw reading accuracy detection fixture and detection method, and belongs to the technical field of test and measurement. The vernier caliper internal measuring claw reading accuracy detection fixture comprises a clamp and a standard gauge block. The clamp is composed of at least three sets of clamp units which are different in length. Each set of clamp unit is provided with a base, a fixed reference block, a flexible reference block and a flexible reference block abutting mechanism. The base is provided with a slide groove. One end of the slide groove is provided with the fixed reference block. The flexible reference block is arranged in the slide groove. The flexible reference block can horizontally move in the slide groove. The flexible reference block is abutted and located by the flexible reference block abutting mechanism. With application of the vernier caliper internal measuring claw reading accuracy detection fixture and detection method, the influence of artificial factors and environmental factors on the measurement result can be reduced so that the working efficiency can be enhanced, and the accuracy of vernier caliper internal measuring claw reading accuracy detection can be guaranteed.

Description

technical field [0001] The invention relates to a checking tool and a detection method, in particular to a checking tool and a testing method for detecting the accuracy of the number indication of measuring claws in a vernier caliper, belonging to the technical field of testing and measurement. Background technique [0002] The vernier caliper is a measuring tool for measuring length, inner and outer diameters, and depth. figure 1 Shown, vernier caliper 1 is made of two parts of main ruler 1-1 and the vernier 1-2 that is attached on the main ruler and can slide. There are two pairs of movable claws on the main ruler and vernier of the vernier caliper, which are inner measuring claws 1-3 and outer measuring claws 1-4. The inner measuring claws 1-3 are usually used to measure the inner diameter, and the outer measuring claws 1-4. Usually used to measure length and outer diameter. [0003] According to the requirements of the relevant national verification standards, when per...

AI Technical Summary

Problems solved by technology

At present, for the detection of the accuracy of the measurement claws in the vernier caliper, the "standard ring gauge verification method" is generally used to carry out the repeatability verification test, that is, by comparing the difference between the measured value of the vernier caliper and the inner diameter of the standard ring gauge, to determine the inner diameter of the vernier caliper. Whether the display accuracy of the measuring claw meets the requirements, but the "standard ring gauge verification method" needs to measure the inner diameter of the standard ring gauge multiple times, and there is a deviation in the measurement position, which causes the measurement point of the inner measuring claw to not be on a straight line with the center of the standard ring gauge. The phenomenon that the cutting edge of the measuring claw is not perpendicular to the standard ring gauge, and the line of sight of the human eye is not perpendicular to the plane of the engraved line, etc., not only affects the accuracy of the verification results, but also lowers the work efficiency; at the same time, due to the measurement force applied by different operators Inconsistency in size leads to inappropriate contact pressure, resulting in the excessive extrusion of the inner measuring claw edge in the standard ring gauge, resulting in the problem of large readings; in addition, due to the linear contact between the inner measuring claw edge and the standard ring gauge, when the inner measuring claw If the claw edge and the standard ring gauge are not fully clamped, or if there are iron filings and other debris between the two, the reading will be too small

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