Bolt crack detection method and thread crack detection device

A technology for crack detection and bolts, applied in measuring devices, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, using sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., to achieve the effect of high detection accuracy

Inactive Publication Date: 2016-11-23
CHINA AIRPLANT STRENGTH RES INST
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Problems solved by technology

[0006] The object of the present invention is to provide a bolt crack detection method and thread...

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  • Bolt crack detection method and thread crack detection device
  • Bolt crack detection method and thread crack detection device
  • Bolt crack detection method and thread crack detection device

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[0036] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below ...

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Abstract

The invention discloses a bolt crack detection method and a bolt crack detection device. The bolt crack detection method includes the following steps: S1, designing and processing a comparison test block containing a standard depth simulated crack; S2, customizing an ultrasonic dual-crystal probe; S3, Adjust the ultrasonic sensitivity on the comparison test block, take 60% of the ultrasonic height as the detection reference wave height; S4, if there is no waveform signal exceeding the reference wave height between the initial wave and the bottom wave, it is determined that the bolt has no cracks; There is a waveform signal exceeding the reference wave height between the wave and the bottom wave, and it is determined that the bolt crack exceeds the standard. The bolt crack detection device includes an ultrasonic flaw detector, an ultrasonic dual-crystal probe, a coupling agent, and a comparison test block; the coupling agent is used to couple the ultrasonic dual-crystal probe to the nail cover of the detected bolt; the ultrasonic dual-crystal probe The crystal probe is connected to the ultrasonic flaw detector through a signal line. The bolt crack detection method and device of the invention can meet the detection of small cracks and has high sensitivity.

Description

technical field [0001] The invention relates to the technical field of crack detection, in particular to a bolt crack detection method and a thread crack detection device. Background technique [0002] Docking bolts are the key load-bearing components on the aircraft. The aircraft fuselage is docked with the central wing, the horizontal stabilizer and vertical stabilizer are docked with the fuselage, the inner and outer pillars of the main landing gear are connected with the fuselage, and the engine mounting bracket is connected with the load-bearing frame. And so on are bolted connections. The safety of these butt bolts is related to the flight and test safety of the whole aircraft. [0003] In the fatigue test of a certain type of aircraft, the flat tail was fixed on the fuselage by connecting bolts. The design life of the whole machine was 14,000 flight hours, and the flat tail connecting bolts broke after 4,500 hours. According to the force analysis of the bolts, the c...

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Application Information

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IPC IPC(8): G01N29/04G01N29/30
CPCG01N29/04G01N29/30G01N2291/2691
Inventor 黄华斌姜跃进徐矛石磊彭智伟
Owner CHINA AIRPLANT STRENGTH RES INST
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