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Ultrasonic bolt fastening force measuring devcie

A test device and fastening force technology, applied in the field of force or stress measurement, can solve the problems of small spot check area, time-consuming and troublesome, etc., and achieve the effect of less detection time

Inactive Publication Date: 2004-07-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only is it time-consuming and troublesome, but also the spot check area is very small
There is no mature method for this abroad

Method used

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  • Ultrasonic bolt fastening force measuring devcie
  • Ultrasonic bolt fastening force measuring devcie
  • Ultrasonic bolt fastening force measuring devcie

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] 1. The theoretical basis of testing of the present invention

[0032] When the bolt is not stressed, the sound speed of longitudinal and transverse waves propagating in it is:

[0033] C l 0 = ( λ + 2 μ ) ρ 0 - - - ( 1 )

[0034] C t 0 = μ / ρ 0

[0035] In the above formula: C l0 , C t0 ——the sound speeds of the longitudinal and transverse waves propagating in the solid material, respectively;

[0036] ρ 0 - the density of the material;

[0037] λ, μ——Lame constants.

...

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PUM

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Abstract

An ultrasonic tester of the fastening force for screw bolt is composed of longitudinal wave transducer connected serially to ultrasonic emitter, longitudinal wave receiver and amplifer, transverse wave transducer connected serially to ultrasonic emitter, transverse wave receiver and amplifier, displacement sensor connected serially with thickness measuring circuit, A / D converter and DSP, temp sensor connected serially to temp measuring circuit, A / D converter and DSP, main oscillator, time pulse generator, and ROM. Its feature is use of sono-elasticity principle.

Description

technical field [0001] The invention relates to the measurement of force or stress, and is an ultrasonic bolt fastening force testing device. Background technique [0002] Architectural steel structure has many factors such as lower cost than concrete structure, higher effective use area than concrete structure, less pollution than concrete structure, good seismic performance, and my country's steel output has leapt to the first in the world, and national policies encourage the use of steel in buildings. And developed rapidly. The proportion of residential steel structures in Japan, South Korea, Western Europe and other regions is as high as 20-50%, while in our country it is still less than 1%. Therefore, there is still a lot of room for development of steel structure buildings in our country. [0003] A large number of high-strength bolts are used in steel structures. Therefore, its construction quality directly affects the quality of constructio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H5/00G01L1/26G01L5/00
Inventor 顾临怡张俊钱筱林侯兆欣周玮琦
Owner ZHEJIANG UNIV
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