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Aluminum alloy multilayer composite plate bolt hole crack defect in-service electromagnetic detection device

An electromagnetic detection and composite board technology, applied in the direction of material magnetic variables, etc., can solve problems such as time-consuming detection and recovery, disassembly is not allowed, false alarms, etc., and achieve the effects of eliminating interference, avoiding missed detection, and fast speed

Inactive Publication Date: 2013-04-03
EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in aviation non-destructive testing, the electromagnetic eddy current non-destructive testing method is usually used to detect crack defects around the bolt holes. Since most of the bolts for locking and fixing aluminum alloy multilayer composite panels are hexagon head bolts, and the bolts are generally ferromagnetic, conventional eddy current sensors are used During scanning along the periphery of the hexagonal head of the bolt, the hexagonal head will interfere with the eddy current detection sensor to generate irregular interference signals. The real defect signal is easily submerged in the interference signal, resulting in missed detection or false alarm
In order to avoid missed inspections, it is necessary for inspectors to scan carefully and slowly, which requires high quality and experience of inspectors, but even so, it is difficult to avoid missed inspections, leaving a safety hazard; if the bolts are disassembled Direct detection of surface defects around the bolt holes of aluminum alloy multilayer boards, although this can avoid missed detection, but it takes a lot of time for detection and recovery, and disassembly is not allowed in some occasions

Method used

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  • Aluminum alloy multilayer composite plate bolt hole crack defect in-service electromagnetic detection device
  • Aluminum alloy multilayer composite plate bolt hole crack defect in-service electromagnetic detection device
  • Aluminum alloy multilayer composite plate bolt hole crack defect in-service electromagnetic detection device

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Embodiment Construction

[0018] figure 1 , figure 2 , image 3 , Figure 4 In the first embodiment shown, the in-service electromagnetic detection device for bolt hole crack defects in aluminum alloy multilayer composite plates includes a sensor skeleton (1), a steel ring (2), a detection coil (3), a coil winding skeleton ( 4), sensor top cover (5), sensor output port (6). The steel ring (2) is embedded and fixed in the lower flat-bottomed hole (10) at the center of the bottom surface of the sensor frame (1); the detection coil (3) is evenly wound and fixed on the outer surface of the coil winding frame (4), and the detection coil (3) outputs The port is electrically connected to the sensor output interface (6); the detection coil (3) and the coil winding skeleton (4) are embedded into the upper flat-bottomed hole (11) on the upper surface of the sensor skeleton (1) off-center; the sensor top cover (5) is fixed on the upper surface of the sensor frame (1); the sensor output port (6) is fixed on t...

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Abstract

The invention discloses an aluminum alloy multilayer composite plate bolt hole crack defect in-service electromagnetic detection device, which comprises a sensor frame, a steel ring, a detecting coil, a coil winding frame, a sensor head cover, and a sensor output end interface. The device provided in the invention adopts a ferromagnetic metal shielding ring method, and effectively shields and eliminates the interference of a bolt hexagon head. The detection effect is good, and the speed is fast. If double or more detecting coils are designed, the efficiency can be further improved. The device does not have high experience requirements on the detection staff. And most importantly, without the influence of an interference signal, the device can well display a defect signal and give an alarm, thus really avoiding omission detection.

Description

[0001] technical field [0002] The invention relates to a nondestructive testing device, in particular to an in-service electromagnetic testing device for bolt hole crack defects of an aluminum alloy multilayer composite plate. Background technique [0003] Aluminum alloy multi-layer composite panels are superimposed by multi-layer aluminum alloy plates. Although they are riveted with aluminum alloys, they are mostly made of bolts and fixed, and have a wide range of applications. Taking the aluminum alloy multilayer composite plate structure of an aircraft as an example, crack defects will occur around the bolt holes during use. These crack defects need to be discovered in time by non-destructive testing methods to ensure the safe operation of the aircraft. At present, in aviation non-destructive testing, the electromagnetic eddy current non-destructive testing method is usually used to detect crack defects around the bolt holes. Since most of the bolts for locking and fixi...

Claims

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Application Information

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IPC IPC(8): G01N27/90
Inventor 林俊明
Owner EDDYSUN (XIAMEN) ELECTRONICS CO LTD
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