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Intelligent bolt device for monitoring dynamic stress conditions of bolt connection

A technology of intelligent bolts and bolts, which is used to measure torque/torsion force and screw directions when connecting components and tightening. It can solve problems such as danger, difficulty in judging bolt pretightening force, time-consuming and labor-intensive problems, and achieve low cost and broad promotion market. and application prospects, the effect of fewer parts

Active Publication Date: 2017-02-15
DALIAN UNIV OF TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] For traditional bolt construction, there are many bolts, and it is difficult to judge whether the bolts have reached the proper pre-tightening force during the construction project.
Construction process monitoring is not only time-consuming and labor-intensive, but also has certain risks for the detection of some special structures.

Method used

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  • Intelligent bolt device for monitoring dynamic stress conditions of bolt connection
  • Intelligent bolt device for monitoring dynamic stress conditions of bolt connection
  • Intelligent bolt device for monitoring dynamic stress conditions of bolt connection

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Embodiment Construction

[0019] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0020] The invention provides an intelligent bolt device for monitoring the dynamic stress of bolts, the specific implementation is as follows:

[0021] The bolt 1 and the protective shell 3 of the smart bolt are made of Q235 steel material, which has strong strength and certain toughness. Make the protective shell 3 a ring-shaped piezoelectric ceramic groove 5 slightly larger than the size of the ring-shaped piezoelectric ceramic 2, and make a lead slot for connecting the positive and negative poles of the ring-shaped piezoelectric ceramic 2 on the edge of the protective shell 3 . The annular piezoelectric ceramic 2 needs to be processed in advance as follows: select a piezoelectric ceramic sheet with a thinner thickness and a size slightly smaller than the annular notch of the protective shell, and weld ...

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Abstract

The invention belongs to the field of bolt connection in civil engineering and mechanical engineering, and relates to an intelligent bolt device for monitoring the dynamic stress conditions of bolt connection. A bolt is used for fastening due to mechanical forces during a construction project; the stress conditions of the bolt are different for different mechanical forces. By utilizing the above feature, when a bolt connection interface is loose, the travel path of ultrasonic wave can be affected, and emitted and received signals of the intelligent bolt are changed; the conditions of the bolt connection interface can be speculated in reverse by utilizing the change of energy of the received signal; and methods comprise an active sensing measurement method and bolt impedance change conditions. A simple and feasible method is provided for dynamic stress monitoring for engineering bolt connection by the intelligent bolt device based on piezoelectric ceramics.

Description

technical field [0001] The present invention is mainly used in the fields of bolt connection in civil engineering and mechanical engineering. Specifically, bolts are tightened by mechanical torque in construction engineering, and different mechanical torques are reflected in different stress states on the bolts. Utilizing this feature, when the bolt connection interface becomes loose, the propagation path of the ultrasonic wave will be affected, and the transmission and reception signals of the smart bolt will change, and the change of the received signal energy can in turn infer the location of the bolt connection interface. status, including active monitoring, passive monitoring methods and bolt impedance changes. This intelligent bolt device based on piezoelectric ceramics provides a simple and feasible method for dynamic force monitoring of bolted connections in engineering. Background technique [0002] Bolt connection is one of the most important ways of connection no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B35/00G01L5/24
CPCF16B35/00G01L5/24
Inventor 霍林生陈冬冬宋钢兵
Owner DALIAN UNIV OF TECH
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