JP4176239B2

JP4176239B2 - Wire inspection device

Info

Publication number: JP4176239B2
Application number: JP18002899A
Authority: JP
Inventors: 喜英出口; 雅之武石; 悦雄永岡
Original assignee: Chubu Electric Power Co Inc; Mitsubishi Heavy Industries Ltd
Current assignee: Chubu Electric Power Co Inc; Mitsubishi Heavy Industries Ltd
Priority date: 1999-06-25
Filing date: 1999-06-25
Publication date: 2008-11-05
Anticipated expiration: 2019-06-25
Also published as: JP2001016730A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば、架空されている活線状態の電線を非破壊検査する電線検査装置に関する。
【０００２】
【従来の技術】
架空されている活線状態の電線を、その使用を中断することなく、電線の外部から非破壊検査できる、電線検査装置として、例えば、実開平３−１１３１４号公報、特公平４−３９６２２号公報、および特公平７−３６６５６号公報などが知られている。これらの電線検査装置は、電線の内部における応力腐食などによる断線の有無、もしくは錆の発生の有無のいずれか一方のみを検知するための単一の検査目的のコイル形センサを、どちらか１つ備えている。これらの電線検査装置は、架空されている活線状態の電線にその外部から取り付けるとともに、電線の長手方向に沿って移動させつつ非破壊検査を行なう。
【０００３】
【発明が解決しようとする課題】
近年、架空されている活線状態の電線を、その外部から非破壊検査することにより、電線の内部における応力腐食などによる断線の有無、および錆の発生の有無を、迅速かつ円滑に、また電線を構成している素線ごとに検知して、電線全体の断線事故などを未然に防ぐことが要求されつつある。ところが、前述した電線検査装置による非破壊検査では、それらのうちの１つの電線検査装置による１回の検査につき、電線の内部における断線している箇所、もしくは錆が発生している箇所のどちらか一方しか検知できない。このため、異なる検査目的のコイル形センサを有する電線検査装置を、順次使い分けて検査作業をする必要がある。
【０００４】
また、前述した特公平７−３６６５６号公報の発明の電線検査装置は、電線検査装置がその進行方向の前方にある電線の表面上の障害物と接触したときには、検査作業を一時中断し、一旦電線から電線検査装置を取り外してその障害物を除け、再び電線に電線検査装置を装着した後、検査作業を開始するという作業を行なわなければならないおそれがある。
【０００５】
よって、本発明が解決しようとする課題は、架空されている活線状態の電線に容易に装着できて、電線の断線の有無および錆の発生の有無を、同時に検知できる電線検査装置を得ることにある。
【０００６】
【課題を解決するための手段】
前記課題を解決するために、本発明に係る電線検査装置は、架空されている活線状態の電線にその外側から装着するとともに、前記電線の長手方向に沿って移動させつつ前記電線を非破壊検査により検査する電線検査装置であって、前記電線をその周方向に沿って囲むように前記電線に対して着脱可能に装着される複数の開閉可能な分割本体部を有し、各分割本体部はスプリングにより閉じる方向に付勢され、かつ前記電線に装着された際に、筒形をなす検査装置本体と、前記各分割本体部にその内周面に露出して取り付けられて、前記検査装置本体が前記電線に装着された際に、前記電線をその周方向に沿って囲むように配置されて、前記電線の断線の有無を検知する断線検知装置と、この断線検知装置とは前記電線の長手方向に位置をずらして、前記各分割本体部にその内周面に露出して取り付けられるとともに、前記検査装置本体が前記電線に装着された際に、前記電線をその周方向に沿って囲むように配置されて、前記電線の錆の有無を検知する錆検知装置とを具備し、前記検査装置本体の進行方向前側に位置する各分割本体部の端部にはそれぞれ障害物除き部材を設け、各障害物除き部材には対向する障害物除き部材がＶ字型の空間を形成するテーパ状面を設けて、この端部が前記電線上の障害物と接触したときに、前記テーパ状面により、前記各分割本体部を前記スプリングの閉じ力に抗して前記検査装置本体を開かせる力を前記各分割本体部に与えて、前記障害物の通過を許すように構成してなることを特徴とするものである。
【０００７】
また、本発明を実施するにあたり、前記断線検知装置が、前記電線の径方向に移動可能であって、前記電線の表面に当接する複数の検知素子と、前記各分割本体部において前記各検知素子を前記電線に向けて押圧する弾性体製の検知素子付勢体とを有している構成とするとよい。
【０００９】
さらに、本発明を実施するにあたり、前記各分割本体部の接合縁部に、これら接合縁部が互いに合わさったときに、互いに引き付け合う磁石を取り付けた構成とするとよい。
【００１０】
【発明の実施の形態】
以下、本発明の一実施形態に係る電線検査装置１を、図１〜図５に基づいて説明する。
【００１１】
本発明の電線検査装置１は、架空されている活線状態の電線２にその外部から着脱可能に装着する検査装置本体３、この検査装置本体３に取り付けられて、電線２の断線の有無を検知する断線検知装置４、および同じく検査装置本体３に取り付けられて、電線２の錆の発生の有無を検知する錆検知装置５などを備えている。
【００１２】
検査装置本体３は、図１、図２、および図５に示すように、その内径が電線２の直径よりも僅かに大きく設定されている略円筒形に形成されているとともに、複数、例えば、一対のヒンジ部材９，１０を有している。これらのヒンジ部材９，１０以外の筒状部分は、図４に示すように、検査装置本体３が装着される電線２の径方向に沿って互いに２つに分割可能な、したがって半割り円筒形の第１分割本体部３ａと、第２分割本体部３ｂとから構成されている。
【００１３】
第１分割本体部３ａと、第２分割本体部３ｂとは、図１に示すように、互いに２箇所の分割面６で接合されて略円筒形をなす。第１分割本体部３ａの外周面上には、第１ヒンジ部材９が一体に設けられ、第２分割本体部３ｂの外周面上にも、第２ヒンジ部材１０が一体に設けられている。これら両ヒンジ部材９，１０は、本体開閉支点用の枢軸８によって、互いに回動可能に連結されている。また、第１ヒンジ部材９には、第１本体開閉用リンク部材１１の一端が枢着され、この第１本体開閉用リンク部材１１の他端は本体開閉駆動軸１２に枢軸１２ａを介して枢着されている。同様に、第２ヒンジ部材１０には、第２本体開閉用リンク部材１３の一端が枢着され、この第２本体開閉用リンク部材１３の他端は本体開閉駆動軸１２に枢軸１２ａを介して枢着されている。これらの部材を備える本体開閉機構は、図示しないが両リンク部材１１，１２を閉じ方向に付勢するスプリングを有している。
【００１４】
本体開閉駆動軸１２を、図１中矢印Ｘで示すように、検査装置本体３の径方向に沿って検査装置本体３から遠ざける向きに動かすと、本体開閉支点用枢軸８を回動中心として、分割面６が互いに離れるように検査装置本体３は、図１中破線矢印Ｘａで示す向きに回動して、第１分割本体部３ａと第２分割本体部３ｂとに２分割するように開く。これとは逆に、本体開閉駆動軸１２を、図１中矢印Ｙで示すように、検査装置本体３の径方向に沿って検査装置本体３に近づける向きに動かすと、本体開閉支点用枢軸８を回動中心として、かつ離れている分割面６が互いに接合するように、開いている第１分割本体部３ａと第２分割本体部３ｂとは、図１中破線矢印Ｙａで示す向きに回動して閉じ、ともに接合して略円筒形状の検査装置本体３をなす。なお、第１分割本体部３ａと第２分割本体部３ｂとが合体した閉じ状態は、本体開閉機構が有する図示しないスプリングの力で保持されるようになっている。
【００１５】
検査装置本体３の電線の長手方向に沿った両端部には、図２および図５に示すように、電線２の非破壊検査の作業中に、電線検査装置１が電線２上のスリーブや水抜きなどの障害物１４と接触しても、電線２の非破壊検査の作業を続行することができるようにするための第１障害物回避手段としての障害物除き部材１５が設けられている。この障害物除き部材１５は、検査装置本体３が有している２箇所の分割面６うち、本体開閉支点用枢軸８が設けられている側とは反対側に、その分割面６に連続して設けられている。詳しく説明すると、障害物除き部材１５は、図5に示すように、前記分割面６に対して段差を設けることなく、連続して斜めに張り出されている。そして、前記分割面６の両側に位置している障害物除き部材１５同士は、電線の長手方向に沿ったそれらの先端から、分割面１６に向かって互いの間隔が狭くなるように、相対向して形成されている。したがって、本実施形態においては、対向している障害物除き部材１５の対向する面同士でＶ字形をなすように、それぞれの障害物除き部材１５は傾斜が形成されたテーパ状面１５ａを有している。
【００１６】
電線検査装置１がその進行方向の前方にある電線２上の障害物１４と接触するのに先だって、障害物１４が障害物除き部材１５同士が形成するＶ字形の空間に進入するように、地上からの遠隔操作などにより、電線検査装置１の姿勢を調整する。その後、電線検査装置１を電線２の長手方向に沿って前進させる。障害物１４は、これに対向する障害物除き部材１５のテーパ状面１５ａに沿って分割面６に誘導される。この過程で、障害物１４と障害物除き部材１５とが互いに押し合うことによって、少なくとも一方の分割面６は開く力を受けるので、前記スプリングの閉じ力に抗して開かれる。これによって、第1分割本体部３ａおよび第２分割本体部３ｂのそれぞれの分割面６が開かれて、これら分割面６同士の間を障害物１４が通過する。障害物１４が両分割面６間を通過すると、互いに離れている第１分割本体部３ａと第２分割本体部３ｂとは、本体開閉駆動軸１２の前記スプリングによって押圧されて再び合体するように閉じる。よって、障害物除き部材１５を有している電線検査装置１は、電線２上にある障害物１４を通過して電線２の非破壊検査の作業を連続して行なうことができる。
【００１７】
また、検査装置本体３の内周面１７には、図２および図５に示すように、電線２の長手方向に沿った検査装置本体３の両端に設けられているそれぞれの開口部１８の付近に、第２障害物回避手段としてのテーパ面１９が形成されている。これらのテーパ面１９は、検査装置本体３の内側に格納される電線２との間隔が、検査装置本体３の中間部分から、２つの開口部１８のそれぞれに向かうにしたがって、次第に広がるように形成されている。
【００１８】
このようなテーパ面１９が形成されている開口部１８を有する検査装置本体３によれば、電線２上の障害物１４が、電線２の直径と検査装置本体３の内径との間隔以下の大きさの場合、電線検査装置１の進行方向の前方側の開口部１８から検査装置本体３の内部に、障害物１４を、容易に、かつ円滑に取り込むことができる。それとともに、検査装置本体３の内部に取り込んだ障害物１４を、前記間隔に通過させて電線検査装置１の進行方向の後方側の開口部１８から検査装置本体３の外部に、障害物１４を容易に、かつ円滑に導き出すことができる。また、この場合、前述したように障害物除き部材１５間による障害物回避動作とは異なり、電線検査装置１の姿勢を調整する必要はない。
【００１９】
第１分割本体部３ａおよび第２分割本体部３ｂのそれぞれの、前述した障害物除き部材１５が設けられている側の分割面６を有する接合縁部７には、互いに引力を及ぼし合う吸着手段としてのピン形の磁石２０が取り付けられている。第１分割本体部３ａに取り付けられている磁石２０ａは、分割面６から凹まされて取り付けられている。また、第２分割本体部３ｂに取り付けられている磁石２０ｂは、磁石２０ａが分割面６から凹んでいる深さだけ、分割面６から突出して取り付けられている。それとともに、磁石２０ａおよび磁石２０ｂは、互いに対向する位置に取り付けられている。
【００２０】
前述のように両分割面６のそれぞれに磁石２０ａおよび磁石２０ｂを取り付けることによって、第１分割本体部３ａと第２分割本体部３ｂとが合体しているときには、磁石２０ａおよび磁石２０ｂの吸着により、第１分割本体部３ａおよび第２分割本体部３ｂの合体（閉じ）状態を積極的に保持できる。また、このとき、磁石２０ａの取り付け穴に磁石２０ｂが嵌合するので、電線検査装置１の電線２への装着を確実に行なうことができるとともに、第１分割本体部３ａと第２分割本体部３ｂとを、互いに電線２の長手方向にずれることなく、正確に位置合わせをして合体させることができる。ひいては、後述する断線検知装置４および錆検知装置５による電線２の非破壊検査の作業を、円滑に、かつ高い精度で行なうことができる。
【００２１】
なお、検査装置本体３および磁石２０を除く検査装置本体３の各構成部品は、後述する断線検知装置４および錆検知装置５の検知精度を低下させないように、非磁性材料で作られることが好ましい。また、磁石２０は、断線検知装置４および錆検知装置５のそれぞれと互いに干渉し合わない位置に取り付けられることが好ましい。そのために、本実施形態においては、開口部１８の端部付近に取り付けている。
【００２２】
断線検知装置４は、図１〜図５に示すように、検査装置本体３の両端部に設けられている２つの開口部１８のうちの、一方の開口部１８の付近に、検査装置本体３の周方向に沿って、かつ検査装置本体３の径方向に沿って分割可能に取り付けられている。この断線検知装置４は、図４および図５に示すように、電線２の表面と互いに当接し合う検知素子２１を遇数個、例えば、１２個有している。これらの検知素子２１には、例えば、電線２に流れる電流が作る磁界の変化を、ホール効果により検知することによって、電線２の内部の断線を検知するホール素子を用いることが好ましい。
【００２３】
それとともに、この断線検知装置４は、図４および図５中実線矢印で示すように、検査装置本体３の中心から放射方向に沿って摺動可能な検知素子支持体２２を１２個有している。これら１２個の検知素子支持体２２は、６個ずつに分けられて、第１分割本体部３ａおよび第２分割本体部３ｂのそれぞれに分配されて、それらの周方向に沿って互いに略等間隔に取り付けられている。これら１２個の検知素子支持体２２のそれぞれは、検査装置本体３の外周面７と内周面１７と貫通して設けられている１２の支持体移動孔２６の内部に、外れ止めを施されて、１つずつ保持されている。これによって、１２個の検知素子支持体２２のそれぞれは、内周面１７を通って、検査装置本体３の径方向に沿って、検査装置本体３の内部から突没するように自在に動くことができる。第１分割本体部３ａおよび第２分割本体部３ｂに略等間隔に配置された各断線検知素子２１および各検知素子支持体２２は、電線２をその直径を含む径方向から２つ一組みで挟み込むように対向して取り付けられている。
【００２４】
これら１２個の検知素子支持体２２のそれぞれに、１２個の検知素子２１がそれぞれ１つずつ一体に取り付けられる。このとき、図２に示すように、１２個の検知素子２１のそれぞれの検知側端面２１ａが、１２個の検知素子支持体２２それぞれの電線２と対向する側の端面から露出するように１２個の検知素子支持体２２のそれぞれに、１２個の検知素子２１をそれぞれ１つずつ一体に取り付ける。１２個の検知素子支持体２２のそれぞれの外周側の、検査装置本体３の長手方向に沿った中央部には、１２個の検知素子２１のそれぞれを、図示しない外部電気回路および同じく図示しない制御回路などに接続するための、接続ケーブル格納溝２５が、検査装置本体３の周方向に沿って設けられている。
【００２５】
また、これらの検知素子支持体２２のそれぞれは、図４に示すように、第１分割本体部３ａおよび第２分割本体部３ｂのそれぞれに、それらの周方向に沿って取り付けられている、検知素子付勢体としての半円弧形の弾性部材２３と互いに係合し合っている。これら２つの弾性部材２３は、第１分割本体部３ａおよび第２分割本体部３ｂのそれぞれの内部で、分割面６の内側に止め金具２７によって、それぞれの両端を固定している。検知素子支持体２２のそれぞれは、図２および図５に示すように、検査装置本体３の長手方向に沿ったそれらの外周側両端部に、弾性部材２３を係合させるための弾性部材係合溝２４を検査装置本体３の周方向に沿って有している。これらの弾性部材係合溝２４に、検査装置本体の径方向外側から弾性部材を係合させることによって、１２個の検知素子支持体２２のそれぞれは、検査装置本体３の径方向に沿って、その内側に向けて常時押圧されている。また、１２個の検知素子支持体２２のそれぞれは、検査装置本体３の長手方向に沿ったそれらの内周側両端部に、支持体テーパ面２８を有している。これらの支持体テーパ面２８は、検知素子支持体２２の検査装置本体３の長手方向に沿った中間部分から、両端部に向かうにしたがって、電線２との間隔が広がるように形成されている。
【００２６】
このような構成および形状の検知素子支持体２２によれば、前述した検査装置本体３が有する、テーパ面１９が形成されている開口部１８がその内部に取り込める程度の大きさの障害物１４であれば、検知素子支持体２２は、電線２の表面と当接しつつ障害物１４を乗り越えることができる。なお、検知素子自体２２と電線２との間に発生する互いに押し合う力は、前記本体開閉機構のスプリングによる２つの分割面６を合体させようとする力および磁石２０同士の吸引力を上回ることがないので、検査装置本体３が不用意に分割してしまうおそれは殆どない。
【００２７】
以上説明した電線検知装置４においては、１２個の検知素子２１を、電線２の周方向に沿って互いに略等間隔に、かつ電線２の径方向に沿って互いに対向させて配置している。また、電線２の表面上の凹凸に拘わらずに、電線２の非破壊検査中は、検知素子２１はその検知側端面２１ａを電線２の表面に当接させていることができる。よって、電線２の周方向に沿って、その全周のわたって、電線２の内部における素線ごとの断線の有無を高い精度で検知することができる。
【００２８】
この検出は、例えば、以下のようにして行われる。
【００２９】
活線状態では、電線としての絶縁電線２の導体中に電流が流れるため、絶縁電線２の外周に商用周波数で変動する磁界が発生する。絶縁電線２の導体中に断線がある場合、絶縁電線２の外周に発生する磁界が、健全な場合と比較して変化する。この磁界の変化を検出することによって、絶縁電線２の導体に発生した断線を検出する。
【００３０】
（第１実施例）
断線検知素子としてホール素子２１を採用した場合の、電線２をなす素線の断線の検出性試験を説明する。この第１実施例においては、前記断線を検出するために、ホール素子２１を１個使用する。
【００３１】
電線２をなす素線の断線の検出性試験には、断線状態を模擬した絶縁電線サンプルに、３０Ａｐ−ｐ（６０Ｈｚ）の電流を通電した。ホール素子２１を絶縁電線サンプルの周方向に９０°ピッチで回転させて検出電圧を測定した結果を表１に示す。表１に示すようにホール素子２１による検出電圧は絶縁電線２の断線部近傍（表１の０°）で小さくなり、それ以外の位置では、検出電圧が大きくなる傾向が認められた。よって、素線の断線を検出できる。絶縁電線２の周方向の検出電圧の最大値―最小値を変動値として表１に示す。
【００３２】
【表１】

【００３３】
（第２実施例）
前述の第１実施例の電線２の断線の検出試験から、断線本数が多くなることによって、検出電圧の変動値が大きくなる傾向が認められる。素線の断線をより明確に判断するために、この変動値をさらに大きくして検出する。すなわち、ホール素子２１による素線の断線の検出感度を向上させる。そのために、前述の本実施形態のように配置した１２個のホール素子２１のうち、電線２の直径方向において互いに対向しているホール素子２１同士を組み合わせる。そのような一対のホール素子２１を、絶縁電線２の周方向に沿って、順次選択することによって、絶縁電線２をその全周にわたって検査する。それらの各組みのホール素子２１が互いに独立に検出する変動値の差を抽出する差動方式を用いる。この差動方式による、差動電圧を用いた検出性の試験結果を図６に示す。
【００３４】
図６に示すように、健全なサンプルでは、差動電圧は小さく、いずれの角度でも電圧変化は小さい。１本断線のサンプルでは、健全な場合に比べ、差動電圧は大きくなっていることが分かる。断線が２本以上の場合には、電圧の変動が顕著に現れ、健全な場合と比較して断線を明確に判断できる。
【００３５】
本実施形態によれば、電線２の全周にわたって略等間隔に配置した１２個のホール素子２１を全て同時に作動させることができる。このため、第２実施例のように、電線２の周方向に沿った所定の検査角度ごとの検査結果を１度に収集して、解析することができる。よって、差動電圧の変動をより明確に検出することができる。
【００３６】
錆検知装置５は、図２に示すように、検査装置本体３の周方向に沿って、かつ検査装置本体３の径方向に沿って開閉可能に、検査装置本体３が有する２つの開口部１８のうちの、断線検知装置４が取り付けられていない側の開口部１８の付近に、固定されて一体に取り付けられている。この錆検知装置５は、検査装置本体３の径方向に沿った断面がコ字形をしているとともに、半割りのリング形に形成されているコア部２９およびこのコア部２９に巻回される錆検出コイル３０などから構成されている。この錆検知装置５は、その内径が検査装置本体３の内径と同じ大きさ形成されている。この錆検知装置５には、自己誘導方式を採用した渦電流探傷法を用いることが好ましい。この渦電流探傷法は、電線２の外表面に渦電流を発生させ、この渦電流によって生じた磁束を、錆検知装置としての渦電流探傷センサ（もしくはＥＣＴセンサ）５が有する錆検出コイル３０によって検出する方法である。また、コア部２９は、永久磁石、例えば、フェライト磁石で作ることが好ましい。
【００３７】
これにより、電線２の非破壊検査の作業中は、検査装置本体３が一体に合体している状態においては、電線２の表面上の凹凸に拘わらずに、電線２をその周方向に沿って全周にわたって、電線２と非接触状態で、電線２の素線ごとの錆の発生の有無を高い精度で検知することができる。
【００３８】
以上説明した本実施形態の電線検査装置１によれば、これが備える検査装置本体３を電線２に、その外部から容易に、かつ殆どずれることなく装着することができる。それとともに、電線２の長手方向に沿って電線検査装置１を移動させつつ電線２の内部における断線の有無および錆の発生の有無を、非破壊検査によって、ともに迅速かつ円滑に、また高い精度で検知することができる。
【００３９】
次に、本実施形態の電線検査装置１を用いた、電線２の内部における素線の断線の有無および錆の発生の有無を、非破壊検査によって検知する作業の一例について、その概略を説明する。
【００４０】
検査作業に先だって、架空されている活線状態の電線２に電線検査装置１を装着する。まず、例えば、地上において作業員などの人手によって、本体開閉駆動軸１２を検査装置本体３から引き離す向きに動かす。これによって、検査装置本体３を、第１分割本体部３ａと、第２分割本体部３ｂとに分割する。この分割状態を保持しつつ、図示しない竿などを用いて電線検査装置１全体を目的の電線２の上方に配置する。このとき、検査装置本体３は自分自身の重量が、本体開閉駆動軸１２が前述の分割状態を閉じようとする力に勝っているので、前述の分割状態は保持されたままである。次に、分割した状態の第１分割本体部３ａと第２分割本体部３ｂとの間に電線２が収まるように、電線検査装置１を目的の電線２にその上方から降ろす。電線検査装置１が電線２と当接し、その降下が押し止められると、本体開閉駆動軸１２の検査装置本体３の分割を閉じようとする力および磁石２０ａと磁石２０ｂとの吸引力の両方の作用によって、第１分割本体部３ａと第２分割本体部３ｂとは、互いに合体して一体になる。これで架空されている活線状態の電線２への電線検査装置１の装着は完了する。
【００４１】
次に、電線２の内部の非破壊検査を開始する。まず、断線検知装置４および錆検知装置５を、例えば、地上から遠隔操作することによって作動させる。断線検知装置４および錆検知装置５の作動状態を、これらに接続されている図示しないメータおよびモニタなどを用いて、検査するとともに、正常な作動状態で安定するように調整する。断線検知装置４および錆検知装置５がともに正常な作動状態で安定した後、電線検査装置１が備えている図示しない自走用駆動装置を、地上から遠隔操作することによって始動させる。この後、地上の作業員が、電線検査装置１の動きを目視により監視するとともに、メータおよびモニタなどを用いて電気的かつ機械的に監視しつつ、電線検査装置１の移動速度を、地上から遠隔操作することにより、随時、任意の非破壊検査に適した速度に設定する。この後、所望する検査データが得られるまで、地上から遠隔操作することにより、電線２の長手方向に沿って、電線検査装置１を往復移動させて検査データを収集する。このデータを収集している間の電線検査装置１およびその各構成部分の動作、および作用などは、既述したので、ここではその説明を省略する。
【００４２】
断線検知装置４および錆検知装置５により、電線２の所定の検査区間を検査して所望するデータを収集し終わった後、地上から遠隔操作することにより、自走用駆動装置の作動を停止させる。その後、同様に地上から遠隔操作することにより、断線検知装置４および錆検知装置５の作動を停止させる。この後、地上から作業員が竿などを用いて本体開閉駆動軸１２を引っ掛けて、電線検査装置１を上方に吊り上げる。これによって、本体開閉駆動軸１２は検査装置本体３を分割する向きに動き、検査装置本体３は第１分割本体部３ａと第２分割本体部３ｂとに分割する。その分割状態を保持したまま、電線検査装置１をさらに上方に吊上げることによって、電線２から分割状態の第１分割本体部３ａと第２分割本体部３ｂとを取り外す。以上で、本実施形態の電線検査装置１を用いた、非破壊検査による電線２の内部の検査作業は終了とする。収集したデータを解析することによって、電線２の内部における断線の有無および錆の発生の有無を素線ごとに検討することができる。
【００４３】
なお、本発明は前記一実施形態には制約されない。例えば、電線検査装置１の移動する向きが、電線２の長手方向に沿って、予め一つの向きに決まっている場合には、障害物除き部材１５および開口部１８のテーパ面１９は、検査装置本体３に、その進行方向の前方の側にだけ設けておけばよい。また、断線検知装置４および錆検知装置５のそれぞれに用いられる検知方法は、それらを同時に併用した場合に、互いに干渉し合うことなく、かつそれぞれが電線２の素線ごとに高い精度で検知結果を得られるものであれば、前述のホール効果および渦電流を利用する方法でなくてもよい。また、第１および第２の前記障害物回避手段は、断線検知装置４および錆検知装置５のうちの少なくとも一方を備えた電線検査装置１にも適用できるのは勿論である。
【００４４】
【発明の効果】
本発明に係る電線検査装置によれば、電線の径方向に沿って開閉可能な筒形の検査装置本体を備えているので、この検査装置本体を開閉することにより、架空されている電線に容易に装着できる。そして、この検査装置本体を構成する各分割本体部のそれぞれに、断線検知装置および錆検知装置を分配して取り付け、検査装置本体を電線に取り付けたときに、断線検知装置および錆検知装置がいずれも電線の全周にわたって配置されるようにしたので、電線の軸方向に本検査装置本体を移動させることによって、電線の断線の有無および錆の発生の有無を、電線の全周にわたってその外部から非破壊検査により、同時に検知することができる。しかも、電線上の障害物を乗り越えるために、スプリングにより閉じる方向に付勢された各分割本体部を障害物との接触によってスプリングによる閉じ力に抗して開かせるテーパ状面が設けられた障害物除き部材を各分割本体部の端部に設けたので、電線検査装置がその進行方向の前方にある電線上の障害物に接触するのに先だって、障害物除き部材のテーパ状面が形成するＶ字型空間に障害物を侵入させ、障害物と障害物除き部材とが互いに押し合うことでスプリングによる閉じ力に抗して各本体分割部を開いてそれらの間に障害物を通過させることができるため、この電線検査装置は、電線上の障害物を容易に乗り越えて、電線の長手方向に沿って移動しつつ電線の非破壊検査を継続することができる。
【００４５】
また、検査装置本体の内周面から突没自在に摺動可能である複数の検知素子を、それぞれ検知素子付勢体によって電線の求心方向に弾性的に押し付けるようにした電線検査装置によれば、電線の非破壊検査中においては、複数の検知素子のそれぞれを、電線の撓み具合、あるいはその表面の凹凸などに追従させて、電線の表面に接触させることができる。これによって、この断線検知装置を有する電線検査装置は、電線の断線の有無を高い精度で検知できる。
【００４７】
また、検査装置本体を構成する各本体分割部の接合縁部に磁石を取り付けた電線検査装置によれば、検査装置本体の各本体分割部を閉じた状態に確実に保持できるので、非破壊検査中において、不用意に各本体分割部が開くことがなくなり、非破壊検査の信頼性を向上できる。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る電線検査装置を示す正面図。
【図２】図１の電線検査装置を、図１中Ａ−Ａ線に沿って示す断面図。
【図３】図１の電線検査装置を、図２中Ｂ−Ｂ線に沿って示す断面図。
【図４】図１の電線検査装置を、図２中Ｃ−Ｃ線に沿って示す断面図。
【図５】図１の電線検査装置を、図１中Ｚ方向から見て示す図。
【図６】図１の電線検査装置による断線検知の測定結果を示す図。
【符号の説明】
１…電線検査装置
２…電線
３…検査装置本体
３ａ…第１分割本体部（分割本体部）
３ｂ…第２分割本体部（分割本体部）
４…断線検知装置
５…渦電流探傷センサ、ＥＣＴセンサ（錆検知装置）
７…接合縁部
１４…障害物
１７…内周面
１９…テーパ状面
２０，２０ａ，２０ｂ…磁石
２１…ホール素子（検知素子）
２３…検知素子付勢体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric wire inspection apparatus that performs non-destructive inspection of a live wire in an imaginary state, for example.
[0002]
[Prior art]
For example, Japanese Utility Model Publication No. 3-11314 and Japanese Patent Publication No. 4-39622 can be used as an electric wire inspection apparatus capable of performing non-destructive inspection from the outside of an electric wire without interrupting the use of a live electric wire in an imaginary state. And Japanese Patent Publication No. 7-36656 are known. These electric wire inspection devices include either one single coil-type sensor for inspection purposes for detecting only the presence or absence of disconnection due to stress corrosion inside the electric wire or the occurrence of rust. I have. These electric wire inspection devices are attached to an imaginary live electric wire from the outside and perform nondestructive inspection while moving along the longitudinal direction of the electric wire.
[0003]
[Problems to be solved by the invention]
In recent years, non-destructive inspection of live electric wires that have been installed over the air from the outside makes it possible to quickly and smoothly check for the presence or absence of disconnection due to stress corrosion inside the wires and the occurrence of rust. It is being demanded to detect for each of the strands constituting the wire to prevent a disconnection accident of the entire electric wire. However, in the non-destructive inspection by the electric wire inspection device described above, either one of the broken wire inside the electric wire or the portion where rust is generated per one inspection by one of the electric wire inspection devices. Only one can be detected. For this reason, it is necessary to carry out the inspection work by sequentially using electric wire inspection apparatuses having coil-type sensors for different inspection purposes.
[0004]
In addition, the wire inspection device according to the invention of the above-mentioned Japanese Patent Publication No. 7-36656 temporarily suspends the inspection work when the wire inspection device contacts an obstacle on the front surface of the wire in the traveling direction. There is a possibility that an operation of removing the electric wire inspection device from the electric wire to remove the obstacle, attaching the electric wire inspection device to the electric wire again, and starting the inspection work may be performed.
[0005]
Therefore, the problem to be solved by the present invention is to obtain an electric wire inspection apparatus that can be easily attached to an aerial live wire and can simultaneously detect the presence or absence of wire breakage and the occurrence of rust. It is in.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problem, an electric wire inspection apparatus according to the present invention is attached to an aerial live electric wire from the outside, and is moved along the longitudinal direction of the electric wire while the electric wire is not destructed. a wire inspection apparatus for inspecting the inspection, the electric wire removably a plurality of openable split body portion which is attached to the wire so as to surround along the circumferential direction, each of the divided main body Is energized in a closing direction by a spring and is attached to the electric wire , and has a cylindrical inspection device main body, and is attached to each of the divided main body portions so as to be exposed on the inner peripheral surface thereof. When the main body is attached to the electric wire, it is arranged so as to surround the electric wire along its circumferential direction, and a disconnection detecting device for detecting the presence or absence of the disconnection of the electric wire, No position in the longitudinal direction In addition, it is attached to each of the divided main body parts so as to be exposed on the inner peripheral surface thereof, and when the inspection apparatus main body is attached to the electric wire, it is arranged so as to surround the electric wire along its circumferential direction. A rust detecting device for detecting the presence or absence of rust of the electric wire, and provided with an obstacle removing member at each end of each divided main body located on the front side in the traveling direction of the inspection device main body, and removing each obstacle The member is provided with a tapered surface that forms a V-shaped space with the obstacle-excluding member facing the member, and when the end portion comes into contact with the obstacle on the electric wire , each of the divided portions is formed by the tapered surface. The main body is configured to allow each of the divided main bodies to pass through the obstacle by giving a force to open the inspection apparatus main body against the closing force of the spring. is there.
[0007]
Further, in carrying out the present invention, the disconnection detection device is movable in the radial direction of the electric wire, and a plurality of detection elements that come into contact with the surface of the electric wire, and each detection element in each divided main body portion It is good to set it as the structure which has the detection element biasing body made from an elastic body which presses toward the said electric wire.
[0009]
Furthermore , when implementing this invention, it is good to set it as the structure which attached the magnet which attracts | sucks each other to the joining edge part of each said division | segmentation main-body part when these joining edge parts mutually match | combined.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the electric wire inspection apparatus 1 which concerns on one Embodiment of this invention is demonstrated based on FIGS.
[0011]
The electric wire inspection apparatus 1 of the present invention is attached to the inspection apparatus main body 3, which is detachably attached to an imaginary live electric wire 2 from the outside, and whether or not the electric wire 2 is disconnected. A disconnection detection device 4 to detect, and a rust detection device 5 that is attached to the inspection device body 3 and detects the presence or absence of rust of the electric wire 2 are provided.
[0012]
As shown in FIGS. 1, 2, and 5, the inspection apparatus body 3 is formed in a substantially cylindrical shape whose inner diameter is set slightly larger than the diameter of the electric wire 2, and a plurality of, for example, A pair of

hinge members

9 and 10 are provided. As shown in FIG. 4, the cylindrical portions other than these

hinge members

9 and 10 can be divided into two along the radial direction of the electric wire 2 to which the inspection apparatus main body 3 is attached. The first divided main body portion 3a and the second divided main body portion 3b.
[0013]
As shown in FIG. 1, the 1st division | segmentation main-body part 3a and the 2nd division | segmentation main-body part 3b are mutually joined by the division surface 6 of two places, and make a substantially cylindrical shape. A first hinge member 9 is integrally provided on the outer peripheral surface of the first divided main body portion 3a, and a second hinge member 10 is also integrally provided on the outer peripheral surface of the second divided main body portion 3b. Both the

hinge members

9 and 10 are connected to each other by a pivot 8 for a main body opening / closing fulcrum so as to be rotatable. One end of a first body opening / closing link member 11 is pivotally attached to the first hinge member 9, and the other end of the first body opening / closing link member 11 is pivoted to the body opening / closing drive shaft 12 via a pivot 12a. It is worn. Similarly, one end of a second main body opening / closing link member 13 is pivotally attached to the second hinge member 10, and the other end of the second main body opening / closing link member 13 is connected to the main body opening / closing drive shaft 12 via a pivot 12a. It is pivotally attached. Although not shown, the main body opening / closing mechanism having these members includes a spring that biases both link members 11 and 12 in the closing direction.
[0014]
When the main body opening / closing drive shaft 12 is moved in the direction away from the inspection apparatus main body 3 along the radial direction of the inspection apparatus main body 3 as indicated by an arrow X in FIG. The inspection apparatus main body 3 is rotated in the direction indicated by the broken line arrow Xa in FIG. 1 so that the divided surfaces 6 are separated from each other, and is opened so as to be divided into two divided into a first divided main body 3a and a second divided main body 3b. . On the contrary, when the main body opening / closing drive shaft 12 is moved in the direction approaching the inspection apparatus body 3 along the radial direction of the inspection apparatus body 3 as indicated by an arrow Y in FIG. The first divided main body 3a and the second divided main body 3b are rotated in the direction indicated by the broken line arrow Ya in FIG. 1 so that the separated dividing surfaces 6 are joined to each other. It is moved and closed, and joined together to form a substantially cylindrical inspection device body 3. The closed state where the first divided main body portion 3a and the second divided main body portion 3b are combined is held by a spring force (not shown) of the main body opening / closing mechanism.
[0015]
As shown in FIGS. 2 and 5, at both ends of the inspection apparatus main body 3 along the longitudinal direction of the electric wire, the electric wire inspection apparatus 1 performs a sleeve or water on the electric wire 2 during a nondestructive inspection operation. An obstacle removing member 15 is provided as a first obstacle avoiding means for allowing the operation of the non-destructive inspection of the electric wire 2 to continue even if it comes into contact with the obstacle 14 such as unplugging. The obstacle removing member 15 is connected to the divided surface 6 on the opposite side of the two divided surfaces 6 of the inspection apparatus main body 3 from the side on which the main body opening / closing fulcrum pivot 8 is provided. Is provided. More specifically, as shown in FIG. 5, the obstacle removing member 15 is continuously and obliquely projected without providing a step with respect to the dividing surface 6. The obstacle-excluding members 15 located on both sides of the dividing surface 6 are opposed to each other so that the distance between the leading ends along the longitudinal direction of the electric wire decreases toward the dividing surface 16. Is formed. Therefore, in this embodiment, each obstacle removing member 15 has a tapered surface 15a formed with an inclination so that the opposing surfaces of the obstacle removing member 15 facing each other form a V shape. ing.
[0016]
Before the electric wire inspection apparatus 1 comes into contact with the obstacle 14 on the electric wire 2 ahead in the traveling direction, the obstacle 14 enters the V-shaped space formed by the obstacle removing members 15 so as to enter the ground. The posture of the electric wire inspection apparatus 1 is adjusted by remote control from the outside. Thereafter, the wire inspection device 1 is advanced along the longitudinal direction of the wire 2. The obstacle 14 is guided to the dividing surface 6 along the tapered surface 15a of the obstacle removing member 15 facing the obstacle 14. In this process, when the obstacle 14 and the obstacle removing member 15 are pressed against each other, at least one of the dividing surfaces 6 receives an opening force, so that it is opened against the closing force of the spring. Thereby, the divided surfaces 6 of the first divided main body portion 3a and the second divided main body portion 3b are opened, and the obstacle 14 passes between the divided surfaces 6. When the obstacle 14 passes between the two divided surfaces 6, the first divided main body 3 a and the second divided main body 3 b that are separated from each other are pressed by the spring of the main body opening / closing drive shaft 12 so as to merge again. close. Therefore, the wire inspection apparatus 1 having the obstacle removing member 15 can continuously perform the nondestructive inspection work of the wire 2 through the obstacle 14 on the wire 2.
[0017]
Further, on the inner peripheral surface 17 of the inspection apparatus main body 3, as shown in FIGS. 2 and 5, in the vicinity of the respective opening portions 18 provided at both ends of the inspection apparatus main body 3 along the longitudinal direction of the electric wire 2. In addition, a tapered surface 19 is formed as a second obstacle avoiding means. These tapered surfaces 19 are formed so that the distance from the electric wire 2 stored inside the inspection apparatus body 3 gradually increases from the intermediate portion of the inspection apparatus body 3 toward each of the two openings 18. Has been.
[0018]
According to the inspection apparatus main body 3 having the opening 18 in which such a tapered surface 19 is formed, the obstacle 14 on the electric wire 2 is not larger than the distance between the diameter of the electric wire 2 and the inner diameter of the inspection apparatus main body 3. In this case, the obstacle 14 can be easily and smoothly taken into the inspection apparatus main body 3 from the opening 18 on the front side in the traveling direction of the wire inspection apparatus 1. At the same time, the obstacle 14 taken into the inspection apparatus main body 3 is passed through the gap and the obstacle 14 is passed from the opening 18 on the rear side in the traveling direction of the wire inspection apparatus 1 to the outside of the inspection apparatus main body 3. It can be derived easily and smoothly. Further, in this case, unlike the obstacle avoiding operation between the obstacle removing members 15 as described above, it is not necessary to adjust the posture of the wire inspection apparatus 1.
[0019]
Adsorption means that exerts an attractive force on the joining edge portion 7 having the dividing surface 6 on the side where the obstacle removing member 15 described above is provided on each of the first divided main body portion 3a and the second divided main body portion 3b. A pin-shaped magnet 20 is attached. The magnet 20a attached to the first split main body 3a is recessed from the split surface 6 and attached. Further, the magnet 20 b attached to the second divided main body portion 3 b is attached so as to protrude from the divided surface 6 by a depth that the magnet 20 a is recessed from the divided surface 6. At the same time, the magnet 20a and the magnet 20b are attached to positions facing each other.
[0020]
As described above, by attaching the magnet 20a and the magnet 20b to each of the two divided surfaces 6, when the first divided main body 3a and the second divided main body 3b are combined, the magnet 20a and the magnet 20b are attracted. The united (closed) state of the first divided main body 3a and the second divided main body 3b can be positively maintained. At this time, since the magnet 20b is fitted into the mounting hole of the magnet 20a, the electric wire inspection apparatus 1 can be securely attached to the electric wire 2, and the first divided main body portion 3a and the second divided main body portion. 3b can be accurately aligned and merged without shifting from each other in the longitudinal direction of the electric wire 2. As a result, the work of nondestructive inspection of the electric wire 2 by the disconnection detector 4 and the rust detector 5 described later can be performed smoothly and with high accuracy.
[0021]
In addition, it is preferable that each component of the inspection apparatus main body 3 excluding the inspection apparatus main body 3 and the magnet 20 is made of a nonmagnetic material so as not to lower the detection accuracy of the disconnection detection apparatus 4 and the rust detection apparatus 5 described later. . Moreover, it is preferable that the magnet 20 is attached in the position which does not mutually interfere with each of the disconnection detection apparatus 4 and the rust detection apparatus 5. FIG. Therefore, in this embodiment, it attaches to the edge part vicinity of the opening part 18. As shown in FIG.
[0022]
As shown in FIGS. 1 to 5, the disconnection detection device 4 is located near one of the two openings 18 provided at both ends of the inspection apparatus body 3. Are attached in such a manner that they can be divided along the circumferential direction and along the radial direction of the inspection apparatus main body 3. As shown in FIGS. 4 and 5, the disconnection detection device 4 has an even number, for example, twelve detection elements 21 that come into contact with the surface of the electric wire 2. For these detection elements 21, for example, it is preferable to use a Hall element that detects a disconnection inside the electric wire 2 by detecting a change in the magnetic field generated by the current flowing through the electric wire 2 by the Hall effect.
[0023]
At the same time, the disconnection detection device 4 has twelve detection element supports 22 slidable in the radial direction from the center of the inspection device body 3 as indicated by solid arrows in FIGS. 4 and 5. Yes. These twelve sensing element supports 22 are divided into six parts and distributed to each of the first divided main body part 3a and the second divided main body part 3b, and are substantially equidistant from each other along their circumferential direction. Is attached. Each of the twelve detection element supports 22 is prevented from coming off inside the twelve support moving holes 26 provided through the outer peripheral surface 7 and the inner peripheral surface 17 of the inspection apparatus body 3. Are held one by one. Accordingly, each of the twelve sensing element supports 22 can freely move so as to protrude from the inside of the inspection apparatus body 3 along the radial direction of the inspection apparatus body 3 through the inner peripheral surface 17. Can do. Each disconnection detecting element 21 and each detecting element support 22 arranged at substantially equal intervals on the first divided main body portion 3a and the second divided main body portion 3b are a set of two electric wires 2 from the radial direction including the diameter thereof. It is attached so as to be sandwiched.
[0024]
Each of the twelve sensing elements 21 is integrally attached to each of the twelve sensing element supports 22. At this time, as shown in FIG. 2, 12 detection side end faces 21a of the 12 detection elements 21 are exposed from the end faces on the side facing the electric wires 2 of the 12 detection element support bodies 22 respectively. Each of the twelve detection elements 21 is integrally attached to each of the detection element supports 22. At the center of the outer periphery of each of the twelve sensing element supports 22 along the longitudinal direction of the inspection apparatus body 3, each of the twelve sensing elements 21 is connected to an external electric circuit (not shown) and a control (not shown). A connection cable storage groove 25 for connection to a circuit or the like is provided along the circumferential direction of the inspection apparatus body 3.
[0025]
Further, as shown in FIG. 4, each of these sensing element supports 22 is attached to each of the first divided main body portion 3a and the second divided main body portion 3b along the circumferential direction thereof. A semicircular elastic member 23 as an element biasing body is engaged with each other. These two elastic members 23 are fixed to both ends of each of the first divided main body portion 3a and the second divided main body portion 3b by fasteners 27 on the inner side of the divided surface 6. As shown in FIGS. 2 and 5, each of the detection element supports 22 is an elastic member engagement for engaging an elastic member 23 with both ends on the outer peripheral side along the longitudinal direction of the inspection apparatus main body 3. A groove 24 is provided along the circumferential direction of the inspection apparatus main body 3. By engaging the elastic member with these elastic member engaging grooves 24 from the outside in the radial direction of the inspection apparatus main body, each of the twelve detection element supports 22 extends along the radial direction of the inspection apparatus main body 3. It is always pressed toward the inside. Each of the twelve detection element supports 22 has support taper surfaces 28 at both inner peripheral ends along the longitudinal direction of the inspection apparatus body 3. These support body taper surfaces 28 are formed such that the distance from the electric wire 2 increases from the intermediate portion of the detection element support body 22 along the longitudinal direction of the inspection apparatus body 3 toward both ends.
[0026]
According to the detection element support body 22 having such a configuration and shape, the obstacle 14 having such a size that the opening 18 formed with the tapered surface 19 of the inspection apparatus main body 3 can be taken into the inside thereof. If present, the detection element support 22 can get over the obstacle 14 while being in contact with the surface of the electric wire 2. It should be noted that the pressing force generated between the detection element 22 and the electric wire 2 exceeds the force for combining the two split surfaces 6 by the spring of the main body opening / closing mechanism and the attractive force between the magnets 20. Therefore, there is almost no possibility that the inspection apparatus main body 3 will be inadvertently divided.
[0027]
In the electric wire detection device 4 described above, twelve detection elements 21 are arranged at substantially equal intervals along the circumferential direction of the electric wire 2 and opposed to each other along the radial direction of the electric wire 2. In addition, regardless of the irregularities on the surface of the electric wire 2, the detection element 21 can make its detection-side end surface 21 a abut on the surface of the electric wire 2 during the nondestructive inspection of the electric wire 2. Therefore, along the circumferential direction of the electric wire 2, it is possible to detect the presence or absence of disconnection for each element wire inside the electric wire 2 with high accuracy over the entire circumference.
[0028]
This detection is performed as follows, for example.
[0029]
In a live line state, since a current flows in the conductor of the insulated wire 2 as an electric wire, a magnetic field that varies at the commercial frequency is generated on the outer periphery of the insulated wire 2. When there is a break in the conductor of the insulated wire 2, the magnetic field generated on the outer periphery of the insulated wire 2 changes as compared with a healthy case. By detecting the change in the magnetic field, the disconnection generated in the conductor of the insulated wire 2 is detected.
[0030]
(First embodiment)
A description will be given of a wire breakage detectability test of the wire 2 in the case where the Hall element 21 is employed as the breakage detection element. In the first embodiment, one Hall element 21 is used to detect the disconnection.
[0031]
In the detectability test of the breakage of the wire forming the electric wire 2, a current of 30 Ap-p (60 Hz) was applied to the insulated wire sample simulating the disconnected state. Table 1 shows the results of measuring the detection voltage by rotating the Hall element 21 at a 90 ° pitch in the circumferential direction of the insulated wire sample. As shown in Table 1, the detected voltage by the Hall element 21 decreased near the broken portion of the insulated wire 2 (0 ° in Table 1), and the detected voltage tended to increase at other positions. Therefore, the disconnection of the strand can be detected. The maximum value-minimum value of the detected voltage in the circumferential direction of the insulated wire 2 is shown in Table 1 as the fluctuation value.
[0032]
[Table 1]

[0033]
(Second embodiment)
From the above-described disconnection detection test of the electric wire 2 of the first embodiment, it is recognized that the fluctuation value of the detection voltage tends to increase as the number of disconnections increases. In order to judge the disconnection of the strand more clearly, this fluctuation value is further increased and detected. That is, the detection sensitivity of the wire breakage by the Hall element 21 is improved. For this purpose, among the 12 Hall elements 21 arranged as in the above-described embodiment, the Hall elements 21 facing each other in the diameter direction of the electric wire 2 are combined. By sequentially selecting such a pair of Hall elements 21 along the circumferential direction of the insulated wire 2, the insulated wire 2 is inspected over its entire circumference. A differential method is used for extracting the difference between the fluctuation values detected by each of these sets of Hall elements 21 independently of each other. FIG. 6 shows a test result of detectability using a differential voltage by this differential method.
[0034]
As shown in FIG. 6, in the healthy sample, the differential voltage is small, and the voltage change is small at any angle. It can be seen that the differential voltage is larger in the single broken sample than in the healthy case. When the number of disconnections is two or more, voltage fluctuations remarkably appear and the disconnection can be clearly determined as compared with a healthy case.
[0035]
According to this embodiment, it is possible to simultaneously operate all the twelve Hall elements 21 arranged at substantially equal intervals over the entire circumference of the electric wire 2. For this reason, as in the second embodiment, the inspection results for each predetermined inspection angle along the circumferential direction of the electric wire 2 can be collected and analyzed at a time. Therefore, it is possible to detect the fluctuation of the differential voltage more clearly.
[0036]
As shown in FIG. 2, the rust detection device 5 has two openings 18 included in the inspection device body 3 that can be opened and closed along the circumferential direction of the inspection device body 3 and along the radial direction of the inspection device body 3. Of these, it is fixed and integrally attached in the vicinity of the opening 18 on the side where the disconnection detecting device 4 is not attached. The rust detection device 5 has a U-shaped cross section along the radial direction of the inspection device main body 3 and is wound around the core portion 29 formed in a half ring shape and the core portion 29. It is composed of a rust detection coil 30 and the like. The rust detection device 5 has an inner diameter that is the same as the inner diameter of the inspection device body 3. It is preferable to use an eddy current flaw detection method employing a self-induction method for the rust detection device 5. In this eddy current flaw detection method, an eddy current is generated on the outer surface of the electric wire 2, and the magnetic flux generated by the eddy current is generated by a rust detection coil 30 included in an eddy current flaw detection sensor (or ECT sensor) 5 as a rust detection device. It is a method of detection. Moreover, it is preferable to make the core part 29 with a permanent magnet, for example, a ferrite magnet.
[0037]
Thereby, during the operation of the non-destructive inspection of the electric wire 2, in the state where the inspection apparatus main body 3 is united integrally, the electric wire 2 is moved along the circumferential direction regardless of the unevenness on the surface of the electric wire 2. The presence / absence of rust for each strand of the electric wire 2 can be detected with high accuracy in a non-contact state with the electric wire 2 over the entire circumference.
[0038]
According to the electric wire inspection apparatus 1 of the present embodiment described above, the inspection apparatus main body 3 included in the electric wire inspection apparatus 1 can be easily attached to the electric wire 2 from the outside thereof with almost no deviation. At the same time, while moving the wire inspection device 1 along the longitudinal direction of the wire 2, the presence or absence of disconnection and the occurrence of rust inside the wire 2 are both quickly and smoothly and highly accurate by nondestructive inspection. Can be detected.
[0039]
Next, an outline of an example of an operation for detecting the presence or absence of a broken wire inside the electric wire 2 and the presence or absence of rust using the non-destructive inspection using the electric wire inspection apparatus 1 of the present embodiment will be described. .
[0040]
Prior to the inspection work, the electric wire inspection device 1 is mounted on the imaginary live wire 2. First, for example, the main body opening / closing drive shaft 12 is moved in a direction to be pulled away from the inspection apparatus main body 3 by a hand such as an operator on the ground. Thereby, the inspection apparatus main body 3 is divided into a first divided main body portion 3a and a second divided main body portion 3b. While maintaining this divided state, the entire wire inspection device 1 is arranged above the target wire 2 using a hook or the like (not shown). At this time, since the weight of the inspection apparatus main body 3 is greater than the force with which the main body opening / closing drive shaft 12 attempts to close the above-described divided state, the above-described divided state is maintained. Next, the electric wire inspection apparatus 1 is lowered onto the target electric wire 2 from above so that the electric wire 2 is accommodated between the divided first main body portion 3a and the second divided main body portion 3b. When the electric wire inspection device 1 comes into contact with the electric wire 2 and its lowering is prevented, both the force for closing the division of the inspection device main body 3 of the main body opening / closing drive shaft 12 and the attraction force between the magnet 20a and the magnet 20b. By the action, the first divided main body portion 3a and the second divided main body portion 3b are united with each other. This completes the mounting of the wire inspection device 1 to the live wire 2 that is imaginary.
[0041]
Next, the nondestructive inspection inside the electric wire 2 is started. First, the disconnection detection device 4 and the rust detection device 5 are operated, for example, by remote operation from the ground. The operating states of the disconnection detecting device 4 and the rust detecting device 5 are inspected by using a meter and a monitor (not shown) connected thereto, and adjusted so as to be stable in a normal operating state. After both the disconnection detection device 4 and the rust detection device 5 are stabilized in a normal operating state, a self-propelled drive device (not shown) provided in the electric wire inspection device 1 is started by being remotely operated from the ground. Thereafter, an operator on the ground visually monitors the movement of the wire inspection device 1 and monitors the movement speed of the wire inspection device 1 from the ground while monitoring it electrically and mechanically using a meter and a monitor. By remote control, the speed suitable for any nondestructive inspection is set at any time. Thereafter, until the desired inspection data is obtained, the wire inspection device 1 is reciprocated along the longitudinal direction of the electric wire 2 by remote control from the ground, and the inspection data is collected. Since the operation | movement of the electric wire inspection apparatus 1 and its each component part during this data collection, the effect | action, etc. were already stated, the description is abbreviate | omitted here.
[0042]
After the disconnection detection device 4 and the rust detection device 5 have inspected a predetermined inspection section of the electric wire 2 and collected desired data, the operation of the self-propelled drive device is stopped by remotely operating from the ground. . Thereafter, similarly, the disconnection detection device 4 and the rust detection device 5 are stopped by remote control from the ground. Thereafter, an operator hooks the main body opening / closing drive shaft 12 from the ground using a scissors or the like, and lifts the electric wire inspection apparatus 1 upward. Accordingly, the main body opening / closing drive shaft 12 moves in a direction to divide the inspection apparatus main body 3, and the inspection apparatus main body 3 is divided into a first divided main body portion 3a and a second divided main body portion 3b. The electric wire inspection apparatus 1 is further lifted upward while maintaining the divided state, whereby the first divided main body portion 3a and the second divided main body portion 3b in the divided state are removed from the electric wire 2. Above, the inspection work inside the electric wire 2 by the nondestructive inspection using the electric wire inspection apparatus 1 of this embodiment is complete | finished. By analyzing the collected data, the presence or absence of disconnection and the presence or absence of rust inside the electric wire 2 can be examined for each element wire.
[0043]
The present invention is not limited to the one embodiment. For example, when the moving direction of the electric wire inspection device 1 is determined in advance in one direction along the longitudinal direction of the electric wire 2, the obstacle removing member 15 and the taper surface 19 of the opening 18 are formed on the inspection device. The main body 3 may be provided only on the front side in the traveling direction. Moreover, the detection method used for each of the disconnection detection device 4 and the rust detection device 5 is a detection result with high accuracy for each strand of the electric wire 2 without interfering with each other when they are used simultaneously. As long as the above-described Hall effect and eddy current are used. Of course, the first and second obstacle avoidance means can also be applied to the wire inspection device 1 including at least one of the disconnection detection device 4 and the rust detection device 5.
[0044]
【The invention's effect】
The electric wire inspection apparatus according to the present invention includes a cylindrical inspection apparatus main body that can be opened and closed along the radial direction of the electric wire. Can be attached to. Then, the disconnection detection device and the rust detection device are distributed and attached to each of the divided main body portions constituting the inspection device main body, and when the inspection device main body is attached to the electric wire, the disconnection detection device and the rust detection device are either Since the inspection device itself is moved in the axial direction of the electric wire, the presence or absence of rupture of the electric wire and the occurrence of rust can be checked from the outside over the entire circumference of the electric wire. Can be detected simultaneously by non-destructive inspection. Moreover, in order to get over the obstacle on the electric wire, the obstacle provided with a tapered surface that opens each divided body portion biased in the closing direction by the spring against the closing force by the spring by contact with the obstacle. since things except member provided on an end portion of each divided main body, the wire inspection apparatus I'm above for contacting the obstacle on the wire in front of the traveling direction, the tapered surface of the obstacle except member The obstacle is invaded into the V-shaped space formed by the obstacle, and the obstacle and the obstacle removing member are pressed against each other, so that the main body divided portions are opened against the closing force by the spring, and the obstacle is placed between them. Since it can be passed, this wire inspection device can easily get over obstacles on the wire and continue non-destructive inspection of the wire while moving along the longitudinal direction of the wire.
[0045]
In addition, according to the wire inspection apparatus, a plurality of detection elements that can slide freely from the inner peripheral surface of the inspection apparatus main body are elastically pressed in the centripetal direction of the electric wires by the detection element biasing bodies, respectively. During the non-destructive inspection of the electric wire, each of the plurality of detection elements can be brought into contact with the surface of the electric wire by following the bending state of the electric wire or the unevenness of the surface thereof. Thereby, the electric wire inspection apparatus which has this disconnection detection apparatus can detect the presence or absence of the disconnection of an electric wire with high precision.
[0047]
In addition, according to the wire inspection device in which the magnet is attached to the joining edge portion of each main body dividing portion constituting the inspection device main body, each main body divided portion of the inspection device main body can be securely held in the closed state, so that the nondestructive inspection is performed. In the middle, the main body dividing portions are not opened carelessly, and the reliability of the nondestructive inspection can be improved.
[Brief description of the drawings]
FIG. 1 is a front view showing an electric wire inspection apparatus according to an embodiment of the present invention.
2 is a cross-sectional view showing the wire inspection apparatus of FIG. 1 along the line AA in FIG. 1;
3 is a cross-sectional view showing the wire inspection apparatus of FIG. 1 along the line BB in FIG. 2;
4 is a cross-sectional view showing the wire inspection apparatus of FIG. 1 along the line CC in FIG. 2;
5 is a diagram showing the wire inspection apparatus of FIG. 1 as viewed from the Z direction in FIG.
6 is a diagram showing a measurement result of disconnection detection by the electric wire inspection apparatus of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electric wire inspection apparatus 2 ... Electric wire 3 ... Inspection apparatus main body 3a ... 1st division | segmentation main-body part (divided main-body part)
3b ... second divided main body (divided main body)
4 ... Disconnection detection device 5 ... Eddy current flaw detection sensor, ECT sensor (rust detection device)
7 ... Joining edge 14 ... Obstacle 17 ... Inner peripheral surface 19 ... Tapered surface 20, 20a, 20b ... Magnet 21 ... Hall element (detecting element)
23 ... Sensing element biasing body

Claims

An electric wire inspection device that inspects the electric wire by non-destructive inspection while being mounted along the longitudinal direction of the electric wire while being attached to the imaginary live electric wire from the outside,
A plurality of openable and closable divided main body portions that are detachably attached to the electric wires so as to surround the electric wires along a circumferential direction thereof, and each divided main body portion is biased in a closing direction by a spring; and When mounted on the electric wire, a cylindrical inspection device body,
It is attached to each of the divided main body portions so as to be exposed on the inner peripheral surface thereof, and when the inspection apparatus main body is attached to the electric wire, the electric wire is arranged so as to surround the electric wire along a circumferential direction thereof. A disconnection detection device for detecting the presence or absence of disconnection,
The disconnection detection device is shifted in the longitudinal direction of the electric wire, and is attached to each divided main body portion so as to be exposed on the inner peripheral surface thereof, and when the inspection device main body is attached to the electric wire, It is arranged so as to surround the electric wire along its circumferential direction, and comprises a rust detection device that detects the presence or absence of rust of the electric wire,
An obstacle removing member is provided at an end of each divided body portion located on the front side in the traveling direction of the inspection apparatus body, and the obstacle removing member that faces the obstacle forming member forms a V-shaped space. A tapered surface is provided, and when the end portion comes into contact with an obstacle on the electric wire, the inspection device main body is opened against the closing force of the spring by the tapered surface. The electric wire inspection apparatus is configured to apply a force to the divided main body portions to allow the obstacle to pass therethrough.

The disconnection detection device is movable in the radial direction of the electric wire, and a plurality of detection elements that contact the surface of the electric wire, and detection that presses the detection elements toward the electric wire in the divided main body portions. The electric wire inspection apparatus according to claim 1, further comprising an element biasing body.

The wire inspection apparatus according to claim 1 or 2, wherein magnets that attract each other when the joining edge portions are joined to each other are attached to the joining edge portions of the divided main body portions.