A device for measuring the variation of bolt length and its application method

Abstract

The invention discloses a bolt length variation measurement device and a using method thereof. The bolt length variation measurement device comprises a base, a length meter, a meter clamping block, asupporting block and a centre; an outer frame of the base is of a nearly trapezoid shape and is provided with an upper bottom plate, a lower bottom plate and an inclined plate; a horizontal slide is formed on the upper bottom plate; the meter clamping block and the supporting block are distributed in a slideable mode on the horizontal slide; a centre fixing block is also arranged at one end of theupper bottom plate; a vertical slide is also formed on the centre fixing block; the centre is fixed in a slideable mode on the vertical slide; the tail end of the centre and the tail end of a meter hand of the length meter are tip ends; the supporting block is distributed between the meter clamping block and the centre; the length meter is distributed on the meter clamping block; and both the lower bottom plate and the inclined plate can be used as supporting bottom surfaces for placing the base on the ground. The detection method disclosed by the invention is simple and convenient to operate, high in measurement accuracy, high in credibility and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of fastener detection, in particular to a bolt length variation measuring device and a method for using the same. Background technique [0002] Bolt-type fasteners may have slight length changes after use, and the service life of the bolts can be judged by detecting the length changes of the bolts before and after use. In order to measure the change in length, it is necessary to measure once before use and repeat the measurement after use. Because the change in the length of the bolt after use is at the micron level, in order to ensure the accuracy of the measurement, it is necessary to reduce the interference of related factors during the two repeated measurements, such as the measurement pressure. [0003] The currently used detection method is a vernier caliper. When measuring the length of the bolt, the two ends of the bolt are used for measurement. After the bolt is used, the edge of the end surface wi...

AI Technical Summary

Problems solved by technology

[0003] The currently used detection method is a vernier caliper. When measuring the length of the bolt, the two ends of the bolt are used for measurement. After the bolt is used, the edge of the end surface will appear irregular distortion due to the influence of tension, extrusion and other forces. , so this measurement method will accumulate the shape error of the end face of the bolt into the length measurement result, which will affect the accuracy of the measurement

In order to avoid the impact of the shape error of the bolt end surface on the length measurement, another method is to process a positioning taper hole at both ends of the bolt, and then inlay steel balls at both ends of the bolt, so that the deformation of the bolt during use will cause the inlaid The steel ball has fallen off and has changed the characteristics of the bolt, so this measurement method has low success rate, low reliability and complicated operation

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