JPH07333054A - Crack sensor for rail - Google Patents
Crack sensor for railInfo
- Publication number
- JPH07333054A JPH07333054A JP12356894A JP12356894A JPH07333054A JP H07333054 A JPH07333054 A JP H07333054A JP 12356894 A JP12356894 A JP 12356894A JP 12356894 A JP12356894 A JP 12356894A JP H07333054 A JPH07333054 A JP H07333054A
- Authority
- JP
- Japan
- Prior art keywords
- rail
- vibration
- converter
- crack
- special rail
- 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.)
- Withdrawn
Links
- 238000003745 diagnosis Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 18
- 229910000617 Mangalloy Inorganic materials 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は鉄道用特殊レール、特に
特殊レール（伸縮継ぎ目及び分岐器のレール・クロッシ
ングのき裂検知に適用される診断装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a railway special rail, and more particularly to a special rail (diagnostic device applied to a crack detection of a rail crossing of an expansion joint and a branching device).
【０００２】[0002]
【従来の技術】従来、レールのき裂の検知については、
超音波探傷車や可搬式の超音波探傷器による検査をおこ
なっているが、分岐器、伸縮継ぎ目区間は、き裂の検知
が確実にできない。2. Description of the Related Art Conventionally, regarding the detection of cracks in rails,
Although inspections are performed using ultrasonic flaw detectors and portable ultrasonic flaw detectors, cracks cannot be detected reliably in the branching device and expansion joint sections.
【０００３】トングレール等の断面形状の変化する特殊
レールには、超音波端子が密着せず、深さの変化も多い
ため、超音波探傷では確実に探傷できず、現地で、定期
的に、線路閉鎖工事を行い、列車を止め、人力により解
体検査（浸透探傷法）を行い、表面き裂の有無をみてい
た。Ultrasonic terminals do not adhere to a special rail such as a tongue rail whose cross-sectional shape changes, and the depth often changes. Therefore, ultrasonic flaw detection cannot reliably perform flaw detection, and on-site, regularly, We performed track closure work, stopped the train, and manually inspected it for disassembly (penetration flaw detection) to check for surface cracks.
【０００４】マンガンクロッシングは、マンガン鋼で、
鋳造されており、製造上、部材に小さな空洞が存在し、
そこからき裂が発生するが、マンガン鋼は、超音波の減
衰が大きく、超音波探傷法の適用が出来ず、現地で、定
期的に、線路閉鎖工事を行い、列車を止め、人力により
解体検査（浸透探傷法）を行い、表面き裂の有無をみて
いた。Manganese crossing is manganese steel,
It is cast, and there are small cavities in the member during manufacturing,
Although cracks occur from there, the ultrasonic attenuation of manganese steel is so great that ultrasonic flaw detection cannot be applied.Therefore, on-site periodic track closure work is performed, trains are stopped, and dismantling inspection is performed manually. (Penetration flaw detection method) was performed to check for the presence of surface cracks.
【０００５】また、き裂が進み折損したとき、一般区間
のレールは、軌道回路が切れ、折損を検知することが出
来るが、分岐器、伸縮継ぎ目は絶縁されているため、検
知することが出来ない。When a crack progresses and breaks, the rail circuit in the general section is broken and the breakage can be detected. Absent.
【０００６】特に、トングレールやクロッシングは、折
損するとフリーになり、列車が脱線する可能性があり、
傷検知の必用性が最も高いので、信頼性管理による早め
の交換をしていた。分岐器、伸縮継ぎ目に関しては、現
在のところ、本発明装置のような、可動状態のままで、
レールのき裂検知が可能な装置は現在のところ存在しな
い。[0006] In particular, the tongue rail and the crossing become free when broken, and the train may derail,
Since it was most necessary to detect scratches, we had to replace it early by reliability management. With regard to the turnout device and the expansion joint, at present, as in the device of the present invention, in the movable state,
There are currently no devices that can detect rail cracks.
【０００７】[0007]
【発明が解決しようとする課題】従来技術には次のよう
な問題点がある。 （１）超音波探傷車や可搬式の超音波探傷器では、複雑
な形状のレールのき裂の検知ができない。The prior art has the following problems. (1) An ultrasonic flaw detection vehicle or a portable ultrasonic flaw detector cannot detect a crack in a rail having a complicated shape.
【０００８】（２）マンガンクロッシングでは、マンガ
ン鋼の超音波の減衰性が大きいため、超音波探傷法の適
用が出来ない。 （３）浸透探傷法によって、表面き裂の有無をみるため
には、人力により解体検査をしなければならない。(2) In manganese crossing, the ultrasonic flaw detection method cannot be applied because the attenuation of ultrasonic waves of manganese steel is large. (3) In order to check the presence or absence of surface cracks by the penetrant flaw detection method, a dismantling inspection must be performed manually.
【０００９】（４）分岐器を解体検査するためには、線
路閉鎖工事を行い、列車を止める必要がある。 （５）定期的に検査するために、その間の安全が保証で
きない。(4) In order to inspect the switch for dismantling, it is necessary to perform track closing work and stop the train. (5) Since it is inspected regularly, the safety during that time cannot be guaranteed.
【００１０】（６）信頼性管理による早めの交換をして
いるので、本来の寿命まで使っていない。 （７）安全のために、き裂がはいつても急進行しない靭
性の強い高価なマンガン鋼を使わざるを得ない。(6) Since the replacement is carried out earlier by the reliability management, the original life is not used. (7) For safety, it is unavoidable to use expensive manganese steel with strong toughness that does not cause rapid cracking.
【００１１】本発明は、断面形状の変化する特殊レール
（例えば伸縮継ぎ目、分岐器の斜継ぎ目、トングレー
ル、受レール、クロッシング等、以下特殊レールとい
う）についての、前記の諸問題を解決することができる
装置を提供することを目的とする。The present invention solves the above-mentioned problems regarding a special rail whose cross-sectional shape changes (for example, expansion joint, oblique joint of branching device, tongue rail, receiving rail, crossing, etc., hereinafter referred to as special rail). It is an object of the present invention to provide a device capable of
【００１２】[0012]
（第１の手段）本発明に係る特殊レールのき裂検知装置
は、振動検知器Ａと、振動検知器Ｂと、Ａ／Ｄ変換器６
と、信号解析部３と、診断部４を有し、前記振動検知器
Ａは特殊レール１の下部の１点に、振動検知器Ｂは断面
形状の変化する特殊レール１の下部の他の点にとりつ
け、特殊レール１の異なる２点の振動を振動検知器Ａと
Ｂで検知し、それぞれの検知信号をＡ／Ｄ変換器６に出
力し、前記信号解析部３は、Ａ／Ｄ変換器６を経由して
入力した振動検知器ＡとＢからの信号を解析して信号解
析結果を診断部４に出力し、前記診断部４は、信号解析
部３から入力した信号に基づき、車輌７の稼動状態で特
殊レールのき裂を検知することを特徴とする。(First Means) A crack detecting device for a special rail according to the present invention comprises a vibration detector A, a vibration detector B, and an A / D converter 6.
And a signal analysis unit 3 and a diagnosis unit 4, wherein the vibration detector A is located at one point below the special rail 1 and the vibration detector B is located at another point below the special rail 1 whose cross-sectional shape changes. The vibration detectors A and B detect vibrations at two different points on the special rail 1 and output the respective detection signals to the A / D converter 6, and the signal analysis unit 3 uses the A / D converter. The signals from the vibration detectors A and B input via 6 are analyzed, and the signal analysis result is output to the diagnosis unit 4, and the diagnosis unit 4 receives the signal from the signal analysis unit 3 based on the signal input from the vehicle 7. The feature is that it detects cracks in the special rail in the operating state of.
【００１３】（第２の手段）本発明に係る特殊レールの
き裂検知装置は、第１の手段において、クロッシング１
５の下部の１点に振動検知器Ａを、クロッシング１５の
下部の他の点に振動検知器Ｂをとりつけ、クロッシング
１５の異なる２点の振動を振動検知器ＡとＢで検知し、
それぞれの検知信号をＡ／Ｄ変換器６に出力し、信号解
析部３は、Ａ／Ｄ変換器６を経由して入力した振動検知
器ＡとＢからの信号を解析して信号解析結果を診断部４
に出力し、診断部４は、信号解析部３から入力した信号
に基づき、車輌７の稼動状態でクロッシング１５のき裂
を検知することを特徴とする。(Second Means) In the crack detecting device for a special rail according to the present invention, the crossing 1 is provided in the first means.
The vibration detector A is attached to one point below the crossing 5, and the vibration detector B is attached to another point below the crossing 15, and vibrations at two different points of the crossing 15 are detected by the vibration detectors A and B.
The respective detection signals are output to the A / D converter 6, and the signal analysis unit 3 analyzes the signals from the vibration detectors A and B input via the A / D converter 6 to obtain the signal analysis result. Diagnostic department 4
The diagnostic unit 4 detects the crack of the crossing 15 in the operating state of the vehicle 7 based on the signal input from the signal analysis unit 3.
【００１４】すなわち、特殊レールに振動検知器ＡとＢ
を取付けることにより、き裂発生に伴なう特殊レールの
振動性状の変化を稼動状態で検知可能にし、信号解析
部、診断部を設けることにより、振動検知器の信号を常
時分析、診断可能とし、リアルタイムでき裂の検知およ
びき裂の程度の推定を可能にした。That is, the vibration detectors A and B are attached to the special rail.
By installing the, it is possible to detect changes in the vibration characteristics of the special rail due to the occurrence of cracks in the operating state, and by providing a signal analysis section and a diagnosis section, it is possible to constantly analyze and diagnose the signal of the vibration detector. In real time, it was possible to detect cracks and estimate the degree of cracks.
【００１５】[0015]
【作用】振動検知器ＡとＢは車輌の走行荷重や分岐器の
転換時の衝撃荷重によって発生する振動を、振動の大き
さに応じた電気信号として出力する。解析部３は振動検
知器Ａ，Ｂの出力である電気信号を電子回路又はコンピ
ュータプログラムによって処理し、振動の性状を表わす
特徴量（振動数、振幅など）に変換する。The vibration detectors A and B output the vibration generated by the running load of the vehicle or the impact load when the switch is turned, as an electric signal according to the magnitude of the vibration. The analysis unit 3 processes the electric signals output from the vibration detectors A and B by an electronic circuit or a computer program and converts the electric signals into characteristic quantities (frequency, amplitude, etc.) representing the nature of vibration.
【００１６】診断部４は解析部３から得られた振動の特
徴量と、予めコンピュータプログラムのデータとして記
録されているき裂のない特殊レールにおいて得られた振
動の特徴量の差（図２と図３におけるＴ1 −Ｔ2 やｆ1
−ｆ2 ）を算出する。診断部４のコンピュータプログラ
ムにはき裂の大きさと特徴量の偏差の相関関係を表わす
データが予め用意されており、得られた特徴量の偏差に
応じてき裂の大きさを推定することができる。The diagnosing unit 4 has a difference between the characteristic amount of vibration obtained from the analyzing unit 3 and the characteristic amount of vibration obtained in a crack-free special rail previously recorded as data of a computer program (see FIG. 2). T 1 −T 2 and f 1 in FIG.
-F 2 ) is calculated. Data representing the correlation between the crack size and the deviation of the characteristic amount is prepared in advance in the computer program of the diagnosis unit 4, and the size of the crack can be estimated according to the obtained deviation of the characteristic amount. .
【００１７】[0017]
（第１実施例）図１に特殊レールへの本発明の実施例を
示す。２つの振動検知器Ａ，Ｂで検知した信号はそれぞ
れＡ／Ｄ変換器６に入力され、ディジタル信号として解
析部３へ入力される。解析部３では、図３に示す様に振
動検知器Ａ，Ｂからの信号を比較し、車輌７の通過時に
発生する振動信号時間差Ｔや伝達関数のピーク周波数ｆ
などの特徴量を抽出する。次にこれらの特徴量は診断部
４に入力されて、予め計算機プログラムにデータとして
蓄えられているき裂のない特殊レール（図２）に対する
値Ｔ1 ，ｆ1 と比較する事によりき裂の有無やき裂の大
きさを診断し、必要により警報５を作動させる。(First Embodiment) FIG. 1 shows an embodiment of the present invention for a special rail. The signals detected by the two vibration detectors A and B are input to the A / D converter 6 and are input to the analysis unit 3 as digital signals. In the analysis unit 3, as shown in FIG. 3, the signals from the vibration detectors A and B are compared, and the vibration signal time difference T that occurs when the vehicle 7 passes and the peak frequency f of the transfer function.
The feature amount such as is extracted. Next, these characteristic quantities are input to the diagnostic unit 4 and compared with the values T 1 and f 1 for the crack-free special rail (FIG. 2) stored in advance in the computer program as data to determine the crack The presence or absence and the size of the crack are diagnosed, and the alarm 5 is activated if necessary.
【００１８】図４は、ノーズ可動型クロッシングの可動
ノーズレール１１及びトングレール１４への適用例を示
す。可動ノーズレール１１及びトングレール１４は図４
（Ｂ）に示すように分岐器を本線側と支線側の間で切り
換える際に移動するから、列車通過時の振動のみでな
く、切換え時の振動を利用して診断を行なうことが可能
になる。図４（Ａ）は、クロッシング１５の可動ノーズ
レール１１に振動検知器Ａ、Ｂを設けた適用例を示す。FIG. 4 shows an example of application of the movable nose crossing to the movable nose rail 11 and the tongue rail 14. The movable nose rail 11 and the tongue rail 14 are shown in FIG.
As shown in (B), since the branch device moves when switching between the main line side and the branch line side, it is possible to make a diagnosis using not only the vibration when passing the train but also the vibration when switching. . FIG. 4A shows an application example in which vibration detectors A and B are provided on the movable nose rail 11 of the crossing 15.
【００１９】[0019]
【発明の効果】本発明は前述のように構成されているの
で以下に記載するような効果を奏する。 （１）超音波探傷法では検知できない特殊レールのき裂
を、見落しなく検知することができる。Since the present invention is constructed as described above, it has the following effects. (1) A crack in a special rail that cannot be detected by the ultrasonic flaw detection method can be detected without overlooking.
【００２０】（２）特殊レールの振動性状の変化に着目
しているため、浸透探傷法のように、表面き裂のみでな
く、内部き裂の検知も可能であるため、き裂発生の見落
しがなくなり、車輌等の運行の安全性を確保することが
できる。(2) Since attention is paid to the change in vibration characteristics of the special rail, not only surface cracks but also internal cracks can be detected as in the penetrant flaw detection method. It will not be dropped, and the safety of the operation of vehicles etc. can be secured.
【００２１】（３）振動検知器を用いる事で、解体検査
する必要がなくなるので、列車を止める線路閉鎖工事
や、人手による検査をなくすことができる。 （４）常時監視システムとなるので、き裂の発生と同時
にき裂を検知できるので、列車の安全運行を確保するこ
とができる。(3) The use of the vibration detector eliminates the need for dismantling inspection, so that it is possible to eliminate track closing work for stopping trains and manual inspection. (4) Since it is a constant monitoring system, it is possible to detect cracks at the same time as cracks occur, so it is possible to ensure safe train operation.
【００２２】（５）き裂の発生と同時にき裂を検知でき
るので、交換周期の延伸をはかることが出来る。 （６）き裂の発生と同時にき裂を検知できるので、高価
なマンガン鋼から一般の鋼材に変えることが出来る。そ
のため経費の節減をはかることが出来る。(5) Since the crack can be detected at the same time as the occurrence of the crack, it is possible to extend the replacement cycle. (6) Since cracks can be detected at the same time that cracks occur, expensive manganese steel can be changed to general steel materials. Therefore, the cost can be reduced.
【図１】本発明の第１実施例の構成図。FIG. 1 is a configuration diagram of a first embodiment of the present invention.
【図２】本発明の作用原理（き裂のない場合）図。FIG. 2 is a diagram showing the operation principle of the present invention (when there is no crack).
【図３】本発明の作用原理（き裂のある場合）図。FIG. 3 is a diagram showing the operation principle of the present invention (when there is a crack).
【図４】本発明の第２実施例の構成図。FIG. 4 is a configuration diagram of a second embodiment of the present invention.
１…特殊レール、 ３…解析部、 ４…診断部、 ５…警報、 ６…Ａ／Ｄ変換器、 ７…車輌、 ８…弾性波、 ９…き裂、 １１…可動ノーズレール、 １２…振動検知器Ａ、 １３…振動検知器Ｂ、 １４…トングレール、 １５…クロッシング。 1 ... Special rail, 3 ... Analysis part, 4 ... Diagnostic part, 5 ... Alarm, 6 ... A / D converter, 7 ... Vehicle, 8 ... Elastic wave, 9 ... Crack, 11 ... Moveable nose rail, 12 ... Vibration Detector A, 13 ... Vibration detector B, 14 ... Tongue rail, 15 ... Crossing.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 守 兵庫県高砂市荒井町新浜二丁目１番１号 三菱重工業株式会社高砂研究所内 (72)発明者 舟津 正之 兵庫県神戸市兵庫区和田崎町一丁目１番１ 号 三菱重工業株式会社神戸造船所内 (72)発明者 小桐 雄一郎 兵庫県神戸市兵庫区和田崎町一丁目１番１ 号 三菱重工業株式会社神戸造船所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Mamoru Tanaka Mamoru Tanaka 1-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Takasago Research Institute (72) Masayuki Funazu, Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo 1-1-1 Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (72) Inventor Yuichiro Kogiri 1-1-1 Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Inside Kobe Shipyard Mitsubishi Heavy Industries, Ltd.
Claims (2)
（１３）と、 Ａ／Ｄ変換器（６）と、信号解析部（３）と診断部
（４）を有し、 前記振動検知器Ａは断面形状の変化する特殊レール
（１）の下部の１点に、振動検知器Ｂは断面形状の変化
する特殊レール（１）の下部の他の点にとりつけ、断面
形状の変化する特殊レール（１）の異なる２点の振動を
振動検知器ＡとＢで検知し、それぞれの検知信号をＡ／
Ｄ変換器（６）に出力し、 前記信号解析部（３）は、Ａ／Ｄ変換器（６）を経由し
て入力した振動検知器ＡとＢからの信号を解析して信号
解析結果を診断部（４）に出力し、前記診断部（４）
は、信号解析部（３）から入力した信号に基づき、車輌
（７）の稼動状態で断面形状の変化する特殊レールのき
裂を検知することを特徴とするレールのき裂検知装置。1. A vibration detector A (12) and a vibration detector B
(13) has an A / D converter (6), a signal analysis unit (3) and a diagnosis unit (4), and the vibration detector A has a section below a special rail (1) whose cross-sectional shape changes. At one point, the vibration detector B is attached to another point below the special rail (1) whose cross-sectional shape changes, and vibrations at two different points on the special rail (1) whose cross-sectional shape changes are referred to as the vibration detector A. B is detected, and each detection signal is A /
The signal analysis unit (3) outputs the signal to the D converter (6) and analyzes the signals from the vibration detectors A and B input via the A / D converter (6) to obtain a signal analysis result. Output to the diagnosis unit (4), and the diagnosis unit (4)
Is a rail crack detection device, which detects a crack in a special rail whose cross-sectional shape changes in an operating state of a vehicle (7) based on a signal input from a signal analysis unit (3).
動検知器Ａ（１２）を、クロッシング（１５）の下部の
他の点に振動検知器Ｂ（１３）をとりつけ、クロッシン
グ（１５）の異なる２点の振動を振動検知器ＡとＢで検
知し、それぞれの検知信号をＡ／Ｄ変換器（６）に出力
し、 信号解析部（３）は、Ａ／Ｄ変換器（６）を経由して入
力した振動検知器ＡとＢからの信号を解析して信号解析
結果を診断部（４）に出力し、診断部（４）は信号解析
部（３）から入力した信号に基づき、車輌（７）の稼動
状態でクロッシング（１５）のき裂を検知することを特
徴とする請求項１記載のレールのき裂検知装置。2. A vibration detector A (12) is attached to one point below the crossing (15), and a vibration detector B (13) is attached to another point below the crossing (15), and the vibration detector B (13) is attached to the crossing (15). Vibrations at two different points are detected by the vibration detectors A and B, and the respective detection signals are output to the A / D converter (6). The signal analysis unit (3) outputs the A / D converter (6). The signals from the vibration detectors A and B input via the circuit are analyzed and the signal analysis result is output to the diagnosis unit (4). The diagnosis unit (4) is based on the signal input from the signal analysis unit (3). The rail crack detection device according to claim 1, wherein a crack in the crossing (15) is detected while the vehicle (7) is in an operating state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12356894A JPH07333054A (en) | 1994-06-06 | 1994-06-06 | Crack sensor for rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12356894A JPH07333054A (en) | 1994-06-06 | 1994-06-06 | Crack sensor for rail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07333054A true JPH07333054A (en) | 1995-12-22 |
Family
ID=14863806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12356894A Withdrawn JPH07333054A (en) | 1994-06-06 | 1994-06-06 | Crack sensor for rail |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07333054A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105584501A (en) * | 2014-11-18 | 2016-05-18 | 郭建 | Real-time monitoring system for railway bed |
| WO2017175276A1 (en) * | 2016-04-04 | 2017-10-12 | 三菱電機株式会社 | Rail breakage detection device |
| JP2020183146A (en) * | 2019-05-07 | 2020-11-12 | 株式会社京三製作所 | Change detection method of turnout adhesion degree and monitoring device for the same |
-
1994
- 1994-06-06 JP JP12356894A patent/JPH07333054A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105584501A (en) * | 2014-11-18 | 2016-05-18 | 郭建 | Real-time monitoring system for railway bed |
| WO2017175276A1 (en) * | 2016-04-04 | 2017-10-12 | 三菱電機株式会社 | Rail breakage detection device |
| WO2017175768A1 (en) * | 2016-04-04 | 2017-10-12 | 三菱電機株式会社 | Rail breakage detection device |
| JPWO2017175768A1 (en) * | 2016-04-04 | 2018-08-09 | 三菱電機株式会社 | Rail break detection device |
| US11572088B2 (en) | 2016-04-04 | 2023-02-07 | Mitsubishi Electric Corporation | Rail break detection device |
| JP2020183146A (en) * | 2019-05-07 | 2020-11-12 | 株式会社京三製作所 | Change detection method of turnout adhesion degree and monitoring device for the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010904 |