CN2041043U - Portable lf magnetic flaw detector - Google Patents
Portable lf magnetic flaw detector Download PDFInfo
- Publication number
- CN2041043U CN2041043U CN 88215755 CN88215755U CN2041043U CN 2041043 U CN2041043 U CN 2041043U CN 88215755 CN88215755 CN 88215755 CN 88215755 U CN88215755 U CN 88215755U CN 2041043 U CN2041043 U CN 2041043U
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- China
- Prior art keywords
- magnetic
- low frequency
- frequency
- probe
- flaw detection
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 239000010703 silicon Substances 0.000 claims abstract description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000523 sample Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 3
- 210000005239 tubule Anatomy 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims 1
- 230000009977 dual effect Effects 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 241001481828 Glyptocephalus cynoglossus Species 0.000 abstract 1
- 230000001066 destructive effect Effects 0.000 abstract 1
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 description 8
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 description 8
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 description 6
- 101150105073 SCR1 gene Proteins 0.000 description 6
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 description 6
- 238000007689 inspection Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000002950 deficient Effects 0.000 description 5
- 230000005347 demagnetization Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000005415 magnetization Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The utility model belongs to the extent of magnetic flaw detection in non-destructive flaw detection, witch mainly solves the shortcoming of flaw detection of shallow depth in alternating current of the magnetizing current and low speed in direct current and the demagnetizing after flaw detection. The utility model is characterized in that a low frequency portable magnetic flaw detector composed of the loop composed of a rectifying, a triggering, a silicon controlled frequency conversion, etc., converts the alternating current of 220v, 50 hz 220v, 50 hz to the low frequency magnetizing current of 20 hz, 36V, 10A. The flaw detection depth is improved to one time comparing with the power alternating current. The volume of the detector is 300*200*150 mm. The total weight is 7 kg. The utility model is suitable for the flaw detection of the steel in field and high altitude site.
Description
The invention belongs to extent of MT in the nondestructive examination
The magnetization current that adopts in the portable set of magnetic-field test has industrial frequency AC, direct current, pulse current etc. at present.（JB3965－85 JB741－80 GB3721－83）
Industrial frequency AC: advantage (1), the continuous conversion of magnetic direction, the magnetic perturbation is good.
(2), probe walking freely, inspection speed is fast.
(3), because magnetic field constantly changes, do not need to demagnetize so detect a flaw.
Shortcoming (1), because kelvin effect, can only check the piece surface defective, when frequency was 50Hz, the degree of depth that magnetic field penetrates in the steel was about 2.5mm.
Direct current: advantage (1), the magnetization degree of depth are dark, can check the defective below surperficial.
Shortcoming: (1), magnetic perturbation are poor.
(2), probe walking motionless (must turn off power supply just can walk about), inspection speed is slow.
(3), detected a flaw need the demagnetization.
Pulse: advantage (1), the magnetization degree of depth darker.
(2), the magnetic perturbation is better.
Shortcoming (1), probe are walked slow, and inspection speed is not high.
(2), need demagnetization after the flaw detection.
The objective of the invention is to overcome the shortcoming of above several magnetization currents.
Theory can prove that the magnetic permeability of the penetration depth of alternating current and the frequency of electric current and material and conductivity three's square root are inversely proportional to, so adopt the method that reduces frequency to increase its flaw detection degree of depth, improves sensitivity.The method that obtains low frequency has three kinds:
(1), Wen's bridge vibration produces a sine wave, amplify through power amplifier.
(2), controllable silicon frequency conversion.
(3), drive a small generators by a small size motor and produce low-frequency current.
Above (1) electric current that method produced little, magnetic field intensity is little.(3) the method volume is big, and is heavy, cost is high.(2) though some distortion of method waveform influences not quite concerning magnetic-field test, so decision adopts the controllable silicon frequency conversion to reduce frequency, its principle is seen accompanying drawing 1.
Through a large amount of experiments, comprehensive each side is as the flaw detection degree of depth, magnetic disturbance situation, and inspection speed, factors such as demagnetization and lifting force, experiment analysis results is: its frequency is more satisfactory at 15～20Hz.
Advantage of the present invention: (1), the magnetic field penetration degree of depth are dark, can find inherent vice (electric current is big more, and the degree of depth is dark more), exceed the 50Hz industrial-frequency alternating current under the same current condition more than one times.
(2), magnetic field constantly changes, the magnetic perturbation is good, magnetic is easy to be adsorbed on above the defective.
(3), probe walking freely, inspection speed is fast.
(4), do not need demagnetization after the flaw detection.
(5), cost is only used about 200 yuan.
(6), volume is 300 * 200 * 150mm.
(7), weight has only 7kg.
(8), output adopts safe voltage 36v, electric current maximum can reach 10A.
(9), mix dedicated probe, magnetic field can penetrate little tube walls such as boiler economizer, superheater, find internal defects, and dedicated probe can be placed on apace on the pipe whole circumference.
The special statement a bit, there are frequency changer and frequency converter in market now, still, first does not also apply in the portable magnetic defectoscope, and the second expense height is minimum more than 5000 yuan, three volumes is big, is not suitable for field and work high above the ground, and concrete form of the present invention will elaborate.
Figure one: circuit theory diagrams
Figure two: shape assumption diagram, wherein 1, rectification silicon bridge, 2, electric capacity, 3, controllable silicon frequency conversion part, 4, trigger circuit, 5, transformer, 6, switch, 7, pilot lamp, 8, frequency adjustment turn-knob, 9, out splice going splice, 10, the indication of output current voltage.
A, probe band pin one end, b, the probe end of usheing to seat, c, spiral pipe lead, are the output line at d, and plug 1 communicates with socket 1 among the figure, and plug 1 inserts socket 2, and the rest may be inferred, the composition spiral pipe, x, y are input adapter.
Figure three: pipe synoptic diagram such as flaw detection superheater:
Wherein 11, superheater tube, 12, the magnetic line of force, 13, dedicated probe, 14, weld seam, 15, defective shows.
The low frequency magnetic crack detector is mainly partly formed by five: rectification part, controllable silicon frequency conversion, triggering loop, transformation, probe.Referring to figure one, figure two.
(1), rectifying part: the 220v voltage commutation is obtained a DC voltage, be input to controllable silicon frequency conversion part, be pressed onto 40v through resistance drop in addition and supply with trigger circuit.
(2), the frequency conversion part: give earlier pulse of SCR1, therefore then SCR1 conducting, and SCR2 is subjected to the forward voltage effect, but do not have trigger pip remains disconnection, when adding a trigger pip to SCR2, conducting immediately.At this moment capacitor C plays the role of changing, when the SCR1 conducting, and the elementary winding 2-1 of electric current by transformer, the electric potential direction of Chan Shenging is " 2 " end for just thereon, and " 1 " end is to bear, and size equals supply voltage E.Because the mutual inductance effect of primary, then transformer 2-3 part also induction size be the voltage of E, its polarity is " 3 " end for just, hold " 2 " is to bear.The voltage that is added on the commutation capacitor C is 2E, polarity is that " 3 " end is for just, " 1 " end is for negative, when pulse signal is added in SCR2, the SCR2 conducting, electric capacity discharges through SCR2, and the cathode potential of SCR2 equals the current potential of " 3 " end, and the SCR1 effect that is subjected to the 2E reverse voltage is just held out immediately, at this moment the electric capacity that commutates charges in the opposite direction, promptly " 1 " end just is, " 3 " end is negative, when so just being SCR1 conducting once again, disconnected immediately SCR2 gets ready, therefore can conduct electricity in turn, output AC voltage, its frequency depends on pulse signal frequency.
(3), trigger the loop: synchronous pair of employing goes out single-transistor and opens the pond oscillator, and wherein pulsed frequency is by R4, R5, R6 and C4, C5 decision.
Regulate R5 and change frequency, regulate R1 and change relative spacing between the pulse, power supply by rectification after the DC voltage about 40v is supplied with in resistance R 2 step-downs.
(4), transformation: the transformer adopting input end has center tap, and no-load voltage ratio is 11, and output voltage is 36v, and electric current is 10A to the maximum, and power is at the miniature transformer of 500vA.
This device can separate transformation and controllable silicon frequency conversion part separately, mixes ready-made transformer again, such as, can use with the compact illumination transformer that 380V, 220V input is arranged.Like this rectification, frequency conversion, triggering are fitted together, weight is less than 1Kg, and volume is littler, and cost is less than 100 yuan.
(5), probe: this device can be joined various magnetic force probes, if (its structure is seen figure two to mix the dedicated probe of tubule flaw detection usefulness, a is inserted b form spiral pipe, the material of c is with enameled wire or other lead, select its line warp according to size of current, select its radical according to the magnetic field that workpiece requires) can penetrate tube wall, find inherent vice, its operation chart is seen figure three, flaw detection plays an important role this failure detector to complex parts such as the economizer of boiler, superheaters, implements one of method of the present invention to be: component parameters shown in the figure:
D1～D4:2CZ56F or 600V, 5A silicon bridge, D5～D6:2CZ56J,
SCR1～SCR2：3CT5，C1：40uF、600V，C2：0.2uF、800V
L1：15mH、2A，R1、R5、R4、R6、R9：100K，
R3、R7：470Ω，R8、R10：180Ω，C3：0.1uF、63V，
C4、C5：0.33uF、63V，R2：25k、25W。
Attaching plug is inserted in the 220V supply socket, become DC voltage through rectifying and wave-filtering, wherein one one supply with to be triggered the loop through the resistance step-down, another part is defeated by the alternating current of popping one's head in about 36V, 20Hz, 10A through the controllable silicon frequency conversion, probe becomes alternating magnetic field with it, workpiece has the leakage field trace at defective position, defect inspection can be come out like this.
Claims (8)
1, low frequency portable magnetic defectoscope of forming by rectification, frequency conversion, triggering, transformer, probe five parts, the invention is characterized in alternating current with 220V, 50Hz, through the controllable silicon frequency conversion, its frequency is by triggering the loop decision, transformer becomes low-voltage, high-current with it and is defeated by probe, and the direct contact workpiece of popping one's head in produces the AC magnetic field about a 20Hz, if join dedicated probe, place it in by the pipe weld bond, form spiral pipe magnetic field.
2, the low frequency portable magnetic defectoscope that requires according to right 1, tubules such as the superheater that it is characterized in that detecting a flaw can be used dedicated probe.
3, the dedicated probe that requires according to right 1 and right 2, a that it is characterized in that popping one's head in forms spiral pipe magnetic field after inserting b.
4, the dedicated probe that requires according to right 1 and right 2 is characterized in that the material of dedicated probe C part can be enameled wire or other lead, selects its line footpath according to size of current, selects its radical according to the magnetic field that workpiece requires.
5, the low frequency portable magnetic defectoscope that requires according to right 1 is characterized in that frequency is best to flaw detection each side factor at 15～20Hz.
6, the low frequency portable magnetic defectoscope that requires according to right 1 it is characterized in that can be rectification, controllable silicon frequency conversion, trigger the loop and be fitted together with transformer and separate, its weight is less than 1kg, mixing ready-madely has centre tapped miniature transformer to use.
7, the low frequency magnetic crack detector that requires according to right 1 is characterized in that weight is 7kg, and volume is 300 * 200 * 150mm.
8, the low frequency magnetic crack detector that requires according to right 1 is characterized in that triggering the loop and has adopted simple synchronization dual output single crystals Guan Zhangchi oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88215755 CN2041043U (en) | 1988-11-10 | 1988-11-10 | Portable lf magnetic flaw detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88215755 CN2041043U (en) | 1988-11-10 | 1988-11-10 | Portable lf magnetic flaw detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2041043U true CN2041043U (en) | 1989-07-12 |
Family
ID=4848493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88215755 Expired - Lifetime CN2041043U (en) | 1988-11-10 | 1988-11-10 | Portable lf magnetic flaw detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2041043U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135553A (en) * | 2010-12-24 | 2011-07-27 | 费金华 | Oscilloscope with magnetic sail |
| CN109884129A (en) * | 2019-03-27 | 2019-06-14 | 爱德森（厦门）电子有限公司 | A kind of device and method of rail aluminum weld quality testing |
-
1988
- 1988-11-10 CN CN 88215755 patent/CN2041043U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135553A (en) * | 2010-12-24 | 2011-07-27 | 费金华 | Oscilloscope with magnetic sail |
| CN102135553B (en) * | 2010-12-24 | 2013-09-11 | 费金华 | Oscilloscope with magnetic sail |
| CN109884129A (en) * | 2019-03-27 | 2019-06-14 | 爱德森（厦门）电子有限公司 | A kind of device and method of rail aluminum weld quality testing |
| CN109884129B (en) * | 2019-03-27 | 2021-11-23 | 爱德森（厦门）电子有限公司 | Device and method for detecting thermite welding quality of steel rail |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C44 | Succession or assignment of patent right | ||
| TR01 | Transfer of patent right |
Address after: Datong Datong, Shanxi Province Datong first thermal power plant Applicant after: Shanxi Electric Power Company Datong No.1 Thermal Power Plant Address before: Metal room of Datong No.1 Thermal Power Plant, Datong, Datong, Shanxi Applicant before: Liu Bin |
|
| ASS | Succession or assignment of patent right |
Owner name: ASSIGNEE JINCHENG CITY, SHANXI PROVINCE SHANXI JIN Free format text: FORMER OWNER: APPLICANT LIU BIN |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |