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Ultrasonic sensor for measuring axial force of bolt

A bolt shaft and ultrasonic technology, applied in the field of sensors, can solve the problems of low ultrasonic measurement accuracy

Active Publication Date: 2020-10-16
零声科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low precision of ultrasonic measurement using couplant, and to provide an ultrasonic sensor for bolt axial force measurement

Method used

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  • Ultrasonic sensor for measuring axial force of bolt
  • Ultrasonic sensor for measuring axial force of bolt
  • Ultrasonic sensor for measuring axial force of bolt

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Experimental program
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Effect test

specific Embodiment approach 1

[0024] Specific implementation mode one, the following combination figure 1 Describe this embodiment, an ultrasonic sensor for bolt axial force measurement described in this embodiment includes a metal pole plate 4, a dielectric layer 5, a liquid film 6 and a bolt test piece 7 to be tested; the metal pole plate 4 and the dielectric layer 5 Parallel to the upper surface of the tested bolt test piece 7, the lower surface of the metal plate 4 is fixed on the upper surface of the dielectric layer 5; the liquid film 6 is coated on the lower surface of the dielectric layer 5 and the upper surface of the tested bolt test piece 7.

[0025] The tested bolt test piece 7 is at zero potential. The effect of the metal plate 4 is to guide the spatial distribution of the electric field as a conductor; the dielectric layer 5 plays the role of transmitting the electric field to the tested bolt test piece 7; The effect of electric field strength; the metal plate 4, the dielectric layer 5, the ...

Embodiment 1

[0036] Embodiment 1: An ultrasonic sensor for bolt axial force measurement includes a metal pole plate 4 , a dielectric layer 5 , a liquid film 6 and a bolt specimen 7 to be tested.

[0037] In this embodiment, the metal pole plate 4 is a circle with a radius of 10 mm, a thickness of 2 mm, and the material is pure copper; the dielectric layer 5 is barium titanate ceramics, with a thickness of 0.15 mm and a dielectric constant of about 25000; the metal pole plate 4 and the dielectric The layer 5 is closely combined through the vacuum coating process; the liquid film 6 is pure water; since the relative dielectric constant of pure water is 81, which is much larger than other common liquids, and it is non-toxic and harmless, it can eliminate the medium layer 5 and the measured The effect of the air between the bolt test piece 7 can greatly increase the equivalent capacitance C1 of the sensor, thereby increasing the electrostatic force and increasing the excitation intensity of the ...

Embodiment 2

[0039] Embodiment 2: The difference from Embodiment 1 is that this embodiment adopts the structure of two concentric metal plates for exciting and receiving ultrasonic waves respectively, so as to replace the duplexer and simplify the measuring device. The rest of the design is consistent with Embodiment 1.

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Abstract

The invention discloses an ultrasonic sensor for measuring the axial force of a bolt, belongs to the field of sensors, and aims to solve the problem of low ultrasonic measurement precision by adoptinga coupling agent. The ultrasonic sensor for measuring the axial force of the bolt comprises a metal polar plate, a dielectric layer, a liquid film and a measured bolt test piece. The metal polar plate and the dielectric layer are arranged on the upper surface of the tested bolt test piece in parallel. The lower surface of the metal polar plate is fixed on the upper surface of the dielectric layer, and the liquid film is coated on the lower surface of the dielectric layer and the upper surface of the tested bolt test piece. The method is different from a conventional ultrasonic technology in which the vibration of a sensor is transmitted to the test piece by using a coupling agent by making the test piece as the polar plate of the capacitor and directly triggering mechanical vibration on the surface of the test piece under the action of electrostatic force between the capacitance plates. Therefore, the ultrasonic wave only exists in the test piece, and the sound velocity can be measured with high precision.

Description

technical field [0001] The invention belongs to the field of sensors and relates to a sensor structure for measuring bolt axial force. Background technique [0002] Bolts are extremely important parts in industrial sites, and they are also one of the weakest links in industrial equipment safety. The axial force measurement of bolts is an important means to ensure the health and long-term service of industrial equipment. At present, the axial force measurement of bolts mainly relies on ultrasonic method. The basic principle of the measurement is the acoustoelastic effect, ie the effect of stress on the speed of sound. However, the acoustoelastic effect is a weak effect, and the sound velocity changes very little under the action of stress (the relative rate of change is less than one thousandth). This requires measuring equipment capable of measuring sound velocity with high precision. [0003] At present, the main ultrasonic methods all require couplant, and the thicknes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/24
CPCG01L5/246
Inventor 蒋川流杨冉李策李展鹏刘玥怡赵超凡汪开灿
Owner 零声科技(苏州)有限公司