Color-changing bolt

Abstract

The invention belongs to the technical field of fixing components, and particularly relates to a color-changing bolt. The color-changing bolt specifically comprises a bolt body, a PC board, a reflective tape, a connecting cap and a pull rod, wherein the bolt body is provided with a mounting hole for enabling a bolt rod and a bolt head of the bolt body to communicate, the pull rod, the connecting cap and the reflective tape and the PC board are arranged in the mounting hole, the pull rod is connected with the bottom of the mounting hole, the connecting cap is used for connecting the pull rod with the PC board, the PC board is connected with the bolt head, and the reflective tape is arranged at the bottom of the PC board. According to the color-changing bolt, the bolt load can be effectivelyand accurately monitored for a long time, the manufacturing cost is low, great significance for the protection and safe operation of equipment using the bolt for connection are achieved, the accurateevaluation of the health condition of a whole engineering structure is achieved, and great social and economic values are achieved.

Description

technical field [0001] The invention belongs to the technical field of fixing components, and in particular relates to a color-changing bolt. Background technique [0002] As one of the most important fasteners, bolts are widely used in engineering practice because of their advantages such as simple construction, good mechanical performance, removable, fatigue resistance, and no loosening under dynamic loads. [0003] Bolts are used for the connection of important machinery, and repeated disassembly or various installation torque methods have extremely high requirements on bolts. Under the action of load, the bolts are subjected to the action of tension and compression cycles. Under the action of alternating tension and compression loads, the thread will undergo plastic deformation and cause relaxation, which in turn will cause the bolt connection to loosen. The loosening of the bolt connection means that with the increase of the use time, the relative circumferential disp...

AI Technical Summary

Problems solved by technology

[0008] According to the US patent US20090092457A1, the principle is that there is a layer of silicone material between the color indicator and the indicator window. When the silicone material is relatively thick, the color cannot be observed through light. When the silicone material is thin, the color can be observed. When the bolt force When changing, rely on the bolt elongation to change the thickness of the silica gel, thereby changing the display color. The disadvantage of this method is that it can only change the color depth, and cannot form a variety of colors, which makes it difficult to quantify the observation.

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