Bolt with tensile stress and defect self-testing functions

A technology of self-testing and tensile stress, which is applied in the direction of specially improved connectors, screws, threaded fasteners, etc. for tensile load, can solve the problems of poor coupling conditions and low operating efficiency, and achieve simplified operation process, Effects of improving measurement efficiency and improving measurement accuracy

Inactive Publication Date: 2013-01-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide a bolt with the function of tensile stress and defect self-detection, which mainly aims at the problems of poor coupling conditions and low operating efficiency in the traditional bolt axial stress measurement process

Method used

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  • Bolt with tensile stress and defect self-testing functions

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Embodiment Construction

[0011] The specific embodiment of the present invention is described in detail below:

[0012] figure 1 Among them, a circular counterbore is opened on the head of the bolt 1, and the piezoelectric wafer 2 is bonded on the protrusion in the counterbore through conductive epoxy resin, and the back of the piezoelectric wafer 2 is attached with a backing 4, and the L5 joint 5 is pressed tightly on the Backing 4 on top. The lower surface of the piezoelectric wafer 2 is connected to the outer wall of the L5 joint 5 through the connecting wire 3 , and the upper surface of the piezoelectric wafer 2 is connected to the anode of the L5 joint 5 through the welding process with the connecting wire 3 . Finally, the compression end cover 6 is fastened to the round hole at the head of the bolt 1 to achieve the overall sealing effect. When in use, it is only necessary to connect the L5 joint 5 to the measurement system to achieve the purpose of measuring the axial stress of the bolt. Sinc...

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Abstract

The invention relates to a bolt with tensile stress and defect self-testing functions. The bolt mainly aims to solve problems of inconsistency of measured values of the thickness of a coupling layer, low measurement efficiency, incapability of realizing online measurement and the like of a traditional bolt for ultrasonically measuring axial stress, and a piezoelectric transducer is arranged in a bolt head of the intelligent bolt. The bolt is convenient to use and simple in operation, measured values of the thickness of a coupling layer can be consistent assuredly, measurement precision is improved, an operation procedure is simplified, measurement efficiency is enhanced, and the bolt can be widely applied to online monitoring or random sampling inspection tasks for bolt axial stress at various joints of key components.

Description

1. Technical field [0001] The invention relates to a bolt with the functions of tensile stress and defect self-detection. The device is small in size and simple in manufacturing process, and can realize the on-line monitoring and sampling inspection tasks of the axial stress of the bolts, solve the measurement error caused by the inconsistent thickness of the coupling layer when measuring the axial stress of the bolts, and the measurement results are more accurate. It can be widely used for on-line monitoring or random sampling inspection of bolt axial stress at key component connections. 2. Background technology [0002] The traditional bolt stress measurement technology is mainly based on the principle of acoustoelasticity, and calculates the axial stress by measuring the time difference of the ultrasonic longitudinal wave propagation time in the axial direction of the bolt. Due to the different shapes of transducers, the different proficiency of operators, and the need t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B31/02F16B35/00
Inventor 徐春广潘勤学李骁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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