A color-changing bolt

Abstract

The invention belongs to the technical field of fixing components, and in particular relates to a color-changing bolt. It specifically includes a bolt body, a PC board, a reflective tape, a connecting cap and a pull rod. The bolt body has a mounting hole communicating with its bolt shank and a bolt head. The pull rod, the connecting cap, and the reflective tape PC board are arranged in the mounting hole. Inside, the pull rod is connected to the bottom of the mounting hole, the connecting cap is used to connect the pull rod and the PC board, the PC board is connected to the bolt head, and the bottom of the PC board is provided with a reflective tape. The invention can carry out long-term effective and accurate monitoring of the bolt load, and has low manufacturing cost, which is of great significance to the protection and safe operation of the equipment connected by bolts, and it is of great significance to accurately evaluate the health status of the entire engineering structure. important social and economic value.

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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