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Fiber bragg grating stress, strain and temperature measuring bolt

A fiber grating and stress monitoring technology, applied in the field of connecting bolts, can solve the problems of low accuracy of strain gauges and reduced monitoring accuracy, and achieve the effects of high sensitivity, strong anti-electromagnetic interference, and easy connection.

Inactive Publication Date: 2015-10-07
HENAN LANXIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual environment, the level of temperature also has a certain impact on the magnitude of the stress, and the accuracy of the strain gauge is not high, which reduces the accuracy of monitoring

Method used

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  • Fiber bragg grating stress, strain and temperature measuring bolt
  • Fiber bragg grating stress, strain and temperature measuring bolt
  • Fiber bragg grating stress, strain and temperature measuring bolt

Examples

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Embodiment Construction

[0016] The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] like Figure 1 to Figure 4 As shown, the present invention includes a bolt 4, one end of the bolt 4 has a monitoring hole 19 along its axial direction, and one end of a stress monitoring fiber grating 102 and one end of a temperature monitoring fiber grating 101 are fixed in the monitoring hole 19, and the stress monitoring fiber The other ends of the grating 102 and the temperature monitoring fiber grating 101 extend out of the monitoring hole 19 and both are fixed at two points in the monitoring hole 19, and the part between the two fixed points of the stress monitoring fiber grating 102 is straightened. shape, the temperature monitoring fiber grating 101 is bent between two fixed points.

[0018] The stress monitoring fiber grating 102 and the temperature monitoring fiber grating 101 are respectively fixed in ...

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Abstract

The invention provides a fiber bragg grating stress, strain and temperature measuring bolt. According to the technical schemes of the invention, the fiber bragg grating stress, strain and temperature measuring bolt comprises a bolt; a monitoring hole along the axial direction of the bolt is formed in one end of the bolt; one end of a strain monitoring fiber bragg grating and one end of a temperature monitoring fiber bragg grating are fixed in the monitoring hole; the other end of the strain monitoring fiber bragg grating and the other end of the temperature monitoring fiber bragg grating both extend out from the through hole; the strain monitoring fiber bragg grating and the temperature monitoring fiber bragg grating are both of a two-point fixed structure; the middle portion of the strain monitoring fiber bragg grating is fixed in the through hole and is in a straightened state; and the temperature monitoring fiber bragg grating is in a bent state. The fiber bragg grating stress, strain and temperature measuring bolt of the invention has the advantages of excellent electric insulation performance, strong anti-electromagnetic interference ability, non-invasive property, high sensitivity, easiness in realizing remote monitoring on measured signals, corrosion resistance, explosion resistance, flexibility of a light path and convenience in connection with a computer.

Description

technical field [0001] The invention relates to a connecting bolt, in particular to a bolt capable of simultaneously measuring double parameters of connecting stress and temperature. Background technique [0002] Bolt is a basic connection device for various structural parts, and it is an essential device for many large-scale equipment such as fan bases, shield equipment, and high-speed rail equipment. Due to various reasons, the bolts may loosen or break and fail, resulting in serious accidents. The stress state is different, and the effective form of the bolt is also different. The damage of tension bolts is mostly plastic deformation and fracture; the variable load bolts are mostly fatigue fracture, and the shear bolts are mostly sheared. If the installation torque is not enough, loosening will occur, and if the torque is too high, the bolt will break under overload conditions. Therefore, it is of great significance to find loose bolts in time and monitor the stress of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D21/02
Inventor 郭向辉许允杰
Owner HENAN LANXIN TECH
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