JPH03114054U - - Google Patents
Info
- Publication number
- JPH03114054U JPH03114054U JP2325090U JP2325090U JPH03114054U JP H03114054 U JPH03114054 U JP H03114054U JP 2325090 U JP2325090 U JP 2325090U JP 2325090 U JP2325090 U JP 2325090U JP H03114054 U JPH03114054 U JP H03114054U
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- thin steel
- steel strip
- voltage
- flaw detection
- Prior art date
- 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.)
- Granted
Links
- 230000005291 magnetic effect Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000005294 ferromagnetic effect Effects 0.000 claims description 3
- 230000005415 magnetization Effects 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims 2
- 230000007547 defect Effects 0.000 claims 1
- 239000000696 magnetic material Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
Description
第１図ａ，ｂは各々この考案の実施例を示し、
ａは側面断面図、ｂは正面断面図、第２図は上記
実施例の磁気センサを示すブロツク図、第３図、
第４図は上記実施例の磁気センサの原理を示し、
第３図ａ，ｂ，ｃはそれぞれ電圧波形図、第４図
は強磁性体コアの磁化特性図、第５図は上記実施
例の磁気センサの出力特性図、第６図は他の実施
例の中空ロールを示す断面図、第７図は第３の実
施例を示すブロツク図、第８図は第７図に示した
実施例の出力特性図、第９図は第４の実施例を示
すブロツク図、第１０図ａ，ｂは従来例を示し、
ａは側面断面図、ｂは正面断面図、第１１図は従
来例の出力特性図である。
１０……鋼板、１１ａ，１１ｂ……中空ロール
、１５……磁化鉄心、１７……磁化コイル、２０
……磁気センサ、２１……強磁性体コア、２２…
…コイル、２３……交流電力供給手段、２４……
固定インピーダンス、２５……直流電圧検出手段
、２６……磁気検出手段、３１……加算器、３２
……直流電源、３５……差動増幅器、３６……基
準電圧発生器。
Figures 1a and 1b each show an embodiment of this invention,
a is a side sectional view, b is a front sectional view, FIG. 2 is a block diagram showing the magnetic sensor of the above embodiment, FIG.
FIG. 4 shows the principle of the magnetic sensor of the above embodiment,
Figures 3a, b, and c are voltage waveform diagrams, Figure 4 is a magnetization characteristic diagram of the ferromagnetic core, Figure 5 is an output characteristic diagram of the magnetic sensor of the above embodiment, and Figure 6 is another example. 7 is a block diagram showing the third embodiment, FIG. 8 is an output characteristic diagram of the embodiment shown in FIG. 7, and FIG. 9 is a fourth embodiment. The block diagram and FIGS. 10a and 10b show a conventional example,
11 is a side sectional view, b is a front sectional view, and FIG. 11 is an output characteristic diagram of a conventional example. 10... Steel plate, 11a, 11b... Hollow roll, 15... Magnetized iron core, 17... Magnetized coil, 20
...Magnetic sensor, 21...Ferromagnetic core, 22...
...Coil, 23...AC power supply means, 24...
Fixed impedance, 25... DC voltage detection means, 26... Magnetic detection means, 31... Adder, 32
...DC power supply, 35...Differential amplifier, 36...Reference voltage generator.
Claims (1)
らの漏洩磁束を検出して薄鋼帯の欠陥を検出する
薄鋼帯の磁気探傷装置において、 上記走行路の両側に薄鋼帯を挟持するように配
設されるとともに、非磁性材料で形成された一対
の中空ロールと、 該一対の中空ロールの一方の中空ロール内に収
納され、磁界を発生させる磁化器と、 他方の中空ロール内に収納され、強磁性体コア
に巻き回されたコイルと、該コイルに固定インピ
ーダンスを介して一定周波数、一定電圧の交流電
力を供給する交流電力供給手段と、上記コイルの
両端から出力する電圧の正側電圧と負側電圧をそ
れぞれ検出する直流電圧検出手段と、該直流電圧
検出手段で検出した正側電圧と負側電圧の差を演
算し漏洩磁束を検出する磁気検出手段とからなる
磁気センサと、 を備えたことを特徴とする薄鋼帯の磁気探傷装置
。 ２ 上記一対の中空ロールの薄鋼帯と接触する領
域の厚さが非接触領域の厚さより薄く形成された
請求項１記載の薄鋼帯の磁気探傷装置。 ３ 上記磁気センサの交流電力供給手段がパルス
電流を出力し、該パルス電流に直流バイアスを加
算する直流バイアス加算手段を設けた請求項１又
は２記載の薄鋼帯の磁気探傷装置。 ４ 上記磁気検出手段からの磁気検出信号に応じ
て上記直流バイアス加算手段で加算する直流バイ
アスを可変制御する制御手段を設けた請求項３記
載の薄鋼帯の磁気探傷装置。[Scope of Claim for Utility Model Registration] 1. A magnetic flaw detection device for a thin steel strip that is installed along the running path of the thin steel strip and detects defects in the thin steel strip by detecting leakage magnetic flux from the thin steel strip, A pair of hollow rolls formed of a non-magnetic material are disposed on both sides of the running path so as to sandwich a thin steel strip therebetween, and the roller is housed in one of the hollow rolls of the pair of hollow rolls, and is housed in one of the hollow rolls to generate a magnetic field. a magnetizer for generating magnetization, a coil housed in the other hollow roll and wound around a ferromagnetic core, and an AC power supply means for supplying AC power of a constant frequency and constant voltage to the coil via a fixed impedance. and DC voltage detection means for detecting the positive side voltage and negative side voltage of the voltage output from both ends of the coil, respectively, and the leakage magnetic flux is calculated by calculating the difference between the positive side voltage and the negative side voltage detected by the DC voltage detection means. A magnetic flaw detection device for a thin steel strip, comprising: a magnetic sensor comprising a magnetic detection means for detecting; 2. The magnetic flaw detection device for a thin steel strip according to claim 1, wherein the thickness of the region of the pair of hollow rolls that contacts the thin steel strip is formed to be thinner than the thickness of the non-contact region. 3. The magnetic flaw detection apparatus for thin steel strips according to claim 1 or 2, wherein the AC power supply means of the magnetic sensor outputs a pulse current and is provided with a DC bias addition means for adding a DC bias to the pulse current. 4. The magnetic flaw detection apparatus for a thin steel strip according to claim 3, further comprising a control means for variably controlling the DC bias added by the DC bias addition means in accordance with the magnetic detection signal from the magnetic detection means.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2325090U JPH0750711Y2 (en) | 1990-03-09 | 1990-03-09 | Magnetic flaw detector for thin steel strip |
| US07/768,986 US5235275A (en) | 1990-02-22 | 1991-02-22 | Magnetic inspection apparatus for thin steel strip having magnetizer and detection coil within a hollow roller rotated by the steel strip |
| PCT/JP1991/000224 WO1991013347A1 (en) | 1990-02-22 | 1991-02-22 | Magnetic flaw detector for thin steel belt |
| DE69123797T DE69123797T2 (en) | 1990-02-22 | 1991-02-22 | MAGNETIC DEFECT DETECTOR FOR THIN STEEL TAPES |
| KR1019960701203A KR960009762B1 (en) | 1990-02-22 | 1991-02-22 | Magnetic flaw detector for thin steel belt |
| KR1019910701415A KR960005364B1 (en) | 1990-02-22 | 1991-02-22 | Magnetic inspection apparatus for thin steel strip having magnetizer and detection coil |
| EP91904342A EP0469158B1 (en) | 1990-02-22 | 1991-02-22 | Magnetic flaw detector for thin steel belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2325090U JPH0750711Y2 (en) | 1990-03-09 | 1990-03-09 | Magnetic flaw detector for thin steel strip |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03114054U true JPH03114054U (en) | 1991-11-22 |
| JPH0750711Y2 JPH0750711Y2 (en) | 1995-11-15 |
Family
ID=31526240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2325090U Expired - Fee Related JPH0750711Y2 (en) | 1990-02-22 | 1990-03-09 | Magnetic flaw detector for thin steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0750711Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009265008A (en) * | 2008-04-28 | 2009-11-12 | Hitachi Building Systems Co Ltd | Flow detector for wire rope |
| JP2012185026A (en) * | 2011-03-04 | 2012-09-27 | Toshiba Corp | Eddy current flaw detecting device, method and program |
-
1990
- 1990-03-09 JP JP2325090U patent/JPH0750711Y2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009265008A (en) * | 2008-04-28 | 2009-11-12 | Hitachi Building Systems Co Ltd | Flow detector for wire rope |
| JP2012185026A (en) * | 2011-03-04 | 2012-09-27 | Toshiba Corp | Eddy current flaw detecting device, method and program |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0750711Y2 (en) | 1995-11-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |