CN202330353U - Conductive metal body non-destructive detection device based on electric leakage field - Google Patents
Conductive metal body non-destructive detection device based on electric leakage field Download PDFInfo
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- CN202330353U CN202330353U CN2011204574543U CN201120457454U CN202330353U CN 202330353 U CN202330353 U CN 202330353U CN 2011204574543 U CN2011204574543 U CN 2011204574543U CN 201120457454 U CN201120457454 U CN 201120457454U CN 202330353 U CN202330353 U CN 202330353U
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Abstract
The utility model discloses a conductive metal body non-destructive detection device based on an electric leakage field. The device comprises a probe, an electrode, a direct current power supply, an amplifier, a filter, an acquisition card and a computer, wherein the probe, the amplifier, the filter, the acquisition card and the computer are electrically connected in sequence. When the device works, the electrode is placed on the surface of a conductive metal body to be detected, the direct current power supply is connected to the electrode, the probe is not contacted with the surface of the conductive metal body to be detected, and the conductive metal body to be detected is in a detection range of the probe; a voltage signal which is detected by the probe is amplified by the amplifier, filtered by the filter, subjected to analog-to-digital (A/D) conversion by the acquisition card and then provided for the computer; and the computer extracts the characteristics of the signal and displays the characteristics of the signal in a form of an oscillograph to obtain the defect information of the conductive metal body to be detected. The device is simple in structure, convenient to operate, safe in use and applicable to automatic flaw detection, particularly to non-ferrous metal such as aluminum, copper and titanium alloy, austenitic stainless steel or a steel material of which the temperature is higher than a Curie point.
Description
Technical field
The present invention relates to a kind of conducting metal body Dynamic Non-Destruction Measurement, particularly based on the electric leakage conducting metal body the cannot-harm-detection device.
Background technology
Non-Destructive Testing is more and more important in the social safety High-efficient Production, but existing lossless detection method can not satisfy numerous growing flaw detection demands.In the existing lossless detection method, magnetic and infiltration are basic to be that manually-operated, efficient are not high; Ultrasound detection exists excitation to limit the problem that sweep velocity improves with detecting frequency matching; EDDY CURRENT detects owing to skin effect and to internal injury and lost efficacy; Ray detection has radiativity and reduces use in principle as far as possible; Magnetic Flux Leakage Inspecting has strong penetrating power and can detect inside and outside wound, but to non-ferrous metal (like copper, aluminium and titanium alloy etc.), austenitic stainless steel and high temperature (cross Curie point and lose magnetism) ferrous metal (like iron and steel etc.) invalid; The magnetic disturbance detection method also is confined to ferrimagnet.Other electromagnetic method has the alternating electric field detection method and exchanges the electromotive force detection method, but equally with eddy current can not detect internal injury because of the vortex flow skin effect; And the DC potential method is based on the probe electricity loop contact of the detection principle of fault location change in voltage and detects, feasibility difference and have the body to be detected of insulation attachment to lose efficacy to the surface when being used for the robotization flaw detection.
Summary of the invention
The present invention provides a kind of conducting metal body the cannot-harm-detection device based on the electric leakage field; The present invention is adapted to the inside and outside wound of conducting metal and detects; Especially the fast detecting of the interior wound of non-ferrous metal and high temperature (loss of excitation property) ferrous metal (like iron and steel etc.); Remedy existing lossless detection method to the above-mentioned material blind spot of detecting a flaw, the social service function that strengthens Non-Destructive Testing.
Conducting metal body the cannot-harm-detection device based on the electric leakage field provided by the invention comprises probe, electrode, direct supply, amplifier, wave filter, capture card and computing machine; Probe, amplifier, wave filter, capture card and computing machine are electrically connected successively; During work; Electrode is positioned over conducting metal to be detected surface, and direct supply is connected on the electrode, and probe does not contact with conducting metal to be detected surface and in the detection range of popping one's head in; Voltage signal that probe detection obtains through amplifier amplify, filter filtering, carry out the A/D conversion through capture card after, offer computing machine and extract signal characteristic and, obtain the defect information of seized conducting metal body with the form demonstration of oscillogram.
It is tan θ that an electric leakage provided by the invention Non-Destructive Testing principle is based on electric field refraction physical action
1/ tan θ
2=σ
1/ σ
2, wherein, σ
1Be metallic object conductivity, σ
2Be air conductivity, θ
1Be the angle of metallic object internal electric field and surface normal, θ
2Angle for electric field in the air and surface normal.Pass to fault location on the galvanic metallic object near air section can produce electric leakage because of refraction.
An electric leakage principle that forms is among the present invention: surface aggregation electric charge when feeding DC current in the conducting metal body; Surface charge is determined by power supply and metallic object jointly; In the metallic object extraneous air, form electric field; When direction of current and metal body surface were not parallel, electric field that forms in the air and metallic object internal electric field satisfied the electric field refraction law; If have defective in the metallic object, defective makes interior electric current of metallic object and Electric Field Distribution change, and meanwhile the metal body surface CHARGE DISTRIBUTION also changes near the defective, is changed by near the electric field outer fault location of electric field refraction law metallic object.In the metallic object extraneous air, form the electric field different like this and be called the electric leakage field with former electric field.
Pick-up unit provided by the invention is that fault location produces an electric leakage phenomenon when utilizing the excitation of metallic object DC electric field; Adopt the contactless detection metallic object of electric-field sensor external electric field; The electric field change that defective causes is detected by sensor; The process signal analysis and processing obtains the defect information of metallic object, can not only detect the metal body surface defective, also can detect the metallic object inherent vice.The characteristics of the device for carrying out said of this method are to adopt low-tension supply to do driving source, and the not contacting metal body of popping one's head in is applicable to that robotization detects, and the device one-piece construction is simple, easy to operate.
Description of drawings
Fig. 1 is a detection method principle schematic of the present invention;
Fig. 2 is the enforcement synoptic diagram of detection method of the present invention;
Fig. 3 is a pick-up unit synoptic diagram of the present invention;
Fig. 4 detects the signal waveforms of defective for detection method of the present invention.
Embodiment
Below in conjunction with accompanying drawing and instance the present invention is done further detailed explanation.
As shown in Figure 1; The inner steady electric field 9 that produces during the perfectly straight stream electric current of conducting metal body to be detected 1; Electric field 9 directions are identical with conducting metal body 1 internal current direction, no current in the conducting metal body 1 near surface air 2 but have electric field 10, and electric field 9 satisfies the electric field refraction law with electric field 10.As if conducting metal body 1 surface or inner defectiveness, its internal electric field 9 changes, and is correspondingly changed by electric field 10 near the air 2 electric field refraction law metal body surface, just produces the electric leakage field near the external air of metallic object fault location like this.
Form principle based on electric leakage field shown in Figure 1; Form electric leakage field detection method as shown in Figure 2: the probe 3 that adopts electric-field sensor to make is positioned in the conducting metal body 1 near surface air 2; Keep certain lifting from conducting metal body 1 surface apart from (in the detection range of probe 3, being 0.2-2mm) like TREKModel325.During detection; Thereby form the electric leakage field to the perfectly straight stream current excitation of metallic object at fault location, probe 3 is along being parallel to the sense of current uniform motion, in order to survey the outer electric field 10 of metallic object and to convert voltage signal into; After the signal analysis and processing if there is unusually then defectiveness, otherwise zero defect.
Be illustrated in figure 3 as the device for carrying out said of this method, device comprises probe 3, electrode 4, direct supply 5, amplifier 6, wave filter 7, capture card 8 and computing machine 11.Electrode 4 is positioned over metal body surface and keeps well contacting with conducting metal body 1 to be detected; Direct supply 5 is connected on the electrode 4; Conductive metallic object 1 feeds DC current and forms electric field excitation conducting metal body 1 to be detected, so that form the electric leakage field at fault location; Probe 3 and conducting metal body 1 surface keep certain lift from apart from but do not contact conducting metal body to be detected; Survey the electric field in the conducting metal body 1 near surface air 2 and be converted into voltage signal; This voltage signal is through amplifier 6 amplifications, wave filter 7 filtering then; After carrying out A/D conversion through capture card 8, offer computing machine 11 and extract signal characteristics and, obtain the defect information of conducting metal body to be detected with the form demonstration of oscillogram.
Oscillogram shown in Figure 4 is on device for carrying out said shown in Figure 3, detects diameter of phi 30mm aluminum tube surfaces 0.5mm (wide) * 0.5mm (deeply) * resulting signal waveforms of the artificial cutting of 10mm (length) with detection method provided by the invention.In the testing process; Probe 3 is lifted from distance with metallic object 1 surface and is 2mm; Probe 3 along direction of current among Fig. 2 with the speed uniform motion of 0.3m/s through near the space defective, repeating motion obtains 3 bimodal signal waveforms among the figure for three times, thereby detects the defective in the aluminum pipe.
The present invention not only is confined to above-mentioned embodiment; Persons skilled in the art are according to embodiment and the disclosed content of accompanying drawing; Can adopt other multiple embodiment embodiment of the present invention, therefore, every employing project organization of the present invention and thinking; Do some simple designs that change or change, all fall into the scope of the present invention's protection.
Claims (1)
1. based on conducting metal body the cannot-harm-detection device of electric leakage field, it is characterized in that: this device comprises probe (3), electrode (4), direct supply (5), amplifier (6), wave filter (7), capture card (8) and computing machine (11); Probe (3), amplifier (6), wave filter (7), capture card (8) and computing machine (11) are electrically connected successively; During work; Electrode (4) is positioned over conducting metal to be detected surface; Direct supply (5) is connected on the electrode (4), and probe (3) does not contact with conducting metal to be detected surface and in the detection range of (3) of popping one's head in; Probe (3) survey the voltage signal obtain through amplifier (6) amplify, after wave filter (7) filtering, carry out the A/D conversion through capture card (8) after, offer computing machine (11) and carry out analyzing and processing, obtain the defect information of seized metallic object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204574543U CN202330353U (en) | 2011-11-17 | 2011-11-17 | Conductive metal body non-destructive detection device based on electric leakage field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204574543U CN202330353U (en) | 2011-11-17 | 2011-11-17 | Conductive metal body non-destructive detection device based on electric leakage field |
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| Publication Number | Publication Date |
|---|---|
| CN202330353U true CN202330353U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204574543U Withdrawn - After Issue CN202330353U (en) | 2011-11-17 | 2011-11-17 | Conductive metal body non-destructive detection device based on electric leakage field |
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| CN (1) | CN202330353U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344694A (en) * | 2013-07-09 | 2013-10-09 | 华北电力大学 | Method for detecting crack defect of in-service strut porcelain insulator |
| CN103995041A (en) * | 2014-05-22 | 2014-08-20 | 中国石油大学(华东) | Non-destructive testing imaging device based on capacitance coupling effect |
-
2011
- 2011-11-17 CN CN2011204574543U patent/CN202330353U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344694A (en) * | 2013-07-09 | 2013-10-09 | 华北电力大学 | Method for detecting crack defect of in-service strut porcelain insulator |
| CN103344694B (en) * | 2013-07-09 | 2015-07-15 | 华北电力大学 | Method for detecting crack defect of in-service strut porcelain insulator |
| CN103995041A (en) * | 2014-05-22 | 2014-08-20 | 中国石油大学(华东) | Non-destructive testing imaging device based on capacitance coupling effect |
| CN103995041B (en) * | 2014-05-22 | 2016-01-13 | 中国石油大学(华东) | Based on the Non-Destructive Testing imaging device of capacitance coupling effect |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120711 Effective date of abandoning: 20130122 |
|
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |