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Intelligent gasket device based on fiber bragg grating for monitoring loosening of bolts

A fiber grating and bolt loosening technology, which is applied in the direction of measuring device, measuring the change force of the optical properties of the material when it is under stress, gaskets, etc., can solve the problems of bolt loosening, and achieve convenient maintenance, simple manufacturing and installation process , the effect of simple structure

Pending Publication Date: 2017-09-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the problem of quantitative monitoring of bolt looseness, the present invention provides an intelligent gasket device with an embedded fiber grating for monitoring bolt looseness

Method used

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  • Intelligent gasket device based on fiber bragg grating for monitoring loosening of bolts
  • Intelligent gasket device based on fiber bragg grating for monitoring loosening of bolts
  • Intelligent gasket device based on fiber bragg grating for monitoring loosening of bolts

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Embodiment Construction

[0033] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0034] The present invention provides an intelligent gasket device for monitoring bolt looseness based on fiber grating, the specific implementation is as follows:

[0035] The gasket 1 is made of Q235 steel material, which has strong strength and certain toughness. The gasket 1 is grooved in the circumferential direction, and the circumferential groove size is 1mm deep and 1mm wide. The fiber grating is buried in the groove, and the fiber grating needs to be pre-stretched to a certain extent after being embedded, and it can be stretched by hanging weights with a certain mass at both ends. Keep the pre-stretched state of the fiber grating and heat-cure it with 353 glue. After the glue fixes the fiber grating, fill it with 704 glue for protection, and keep it in a pre-stretched state until the 704 glue is a...

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Abstract

The invention belongs to the technical field of bolt connection state monitoring of civil engineering and mechanical engineering, and provides an intelligent gasket device based on fiber bragg grating for monitoring loosening of bolts. When a bolt is loose, pressure of the bolt on a gasket is reduced, according to a Poisson principle, the gasket can shrink correspondingly, the wavelength of a fiber bragg grating sensor inlaid in the gasket can be changed, the connection state of the bolt can be speculated reversely by change of the received wavelength, and therefore, by the intelligent gasket based on fiber bragg grating, a simple, convenient and feasible method for monitoring connection loosening of bolts on engineering is provided.

Description

technical field [0001] The present invention is mainly used in the field of bolt connection state monitoring in civil engineering and mechanical engineering. Specifically, when the bolts loosen, the pressure of the bolts on the gasket will decrease, and according to Poisson's principle, the gasket will correspondingly Shrinkage, the wavelength of the fiber grating sensor embedded in the gasket will change, and the state of the bolt connection can be inferred by using the wavelength change received. This smart gasket based on the grating fiber provides a method for monitoring the loosening of the bolt connection in engineering. Simple and feasible method. Background technique [0002] In modern large-scale civil structures, such as long-span steel bridges, super high-rise buildings, and large-scale transmission towers, bolted connections are an important connection method, and their reliability is the basis for ensuring project quality and normal service of structures. There...

Claims

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Application Information

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IPC IPC(8): F16B43/00G01L1/24
CPCF16B43/00G01L1/242
Inventor 霍林生陈冬冬宋钢兵张建仁
Owner DALIAN UNIV OF TECH