JP2010038555A - Setting device of circumferential direction start position in oil well pipe screw-thread shape perimeter measurement - Google Patents

Setting device of circumferential direction start position in oil well pipe screw-thread shape perimeter measurement Download PDF

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JP2010038555A
JP2010038555A JP2008198246A JP2008198246A JP2010038555A JP 2010038555 A JP2010038555 A JP 2010038555A JP 2008198246 A JP2008198246 A JP 2008198246A JP 2008198246 A JP2008198246 A JP 2008198246A JP 2010038555 A JP2010038555 A JP 2010038555A
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oil well
image information
well pipe
screw
image
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JP5146181B2 (en
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Hideyuki Yuzawa
秀行 湯澤
Tomomitsu Kimura
智充 木村
Toshibumi Kodama
俊文 児玉
Hiroyuki Matsui
博之 松井
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JFE Steel Corp
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a setting device of a circumferential direction start position in oil well pipe screw-thread shape perimeter measurement. <P>SOLUTION: This device is equipped with an information storage preservation means 6a for storing screw-thread shape perimeter measurement image information acquired by rotating an optical system correlatively with a rotation angle of the optical system when imaging a silhouette image of each image information, by using a circumferential direction position when starting rotation of the optical system as a start point (0 degree); an image information processing means 6b for reading out image information related to a screw-thread part of the oil well pipe W from the information storage preservation means 6a, and extracting information agreeing with a characteristic of registered image information of the silhouette image having as a characteristic, a starting position of a recessed or projecting stripe on the distal end of the screw-thread part from inside the image information related to the screw-thread part of the oil well pipe W; and a start position setting means 6c for setting a rotation angle when imaging the image information having as a characteristic, the starting position of the recessed or projecting stripe at the circumferential direction start position (0 degree) in oil well pipe screw-thread shape perimeter measurement, based on processing by the image information processing means 6b. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、油井管のねじ形状を全周にわたり測定する装置で得られるねじ形状全周測定画像情報を活用するに際し、光源からの光を平行光として測定対象物の油井管のねじ部に照射する照射手段と、測定対象物の周囲を通過した平行光と被測定対象物で遮蔽された平行光とで形成されるシルエット像を撮像する撮像素子を有するカメラとを具備する少なくとも1対の光学系を、油井管のねじ部周りに回転させて得られるシルエット像の画像情報を、目視でも認識できる周方向起点位置に対応させて保存するための、周方向起点位置の設定装置に関する。   The present invention irradiates the thread portion of the oil well pipe of the measurement object as parallel light with the light from the light source when utilizing the screw shape full circumference measurement image information obtained by the apparatus that measures the screw shape of the oil well pipe over the entire circumference. And at least one pair of optics comprising: an illuminating means that performs imaging; and a camera having an imaging device that captures a silhouette image formed by parallel light that has passed around the measurement object and parallel light that is shielded by the measurement object The present invention relates to a setting device for a circumferential starting point position for storing image information of a silhouette image obtained by rotating a system around a threaded portion of an oil well pipe in correspondence with a circumferential starting point position that can be recognized visually.

油井管の管端部に形成されたねじは、ねじ継ぎ手とねじ結合される。ねじ継ぎ手で接続された油井管は厳しい条件下で使用されるので、継ぎ手部でのシール性能は重要である。
そこで、ねじ形状を測定し、ねじ山高さ、テーパ量、シール部径Ｄｓ等を求め、品質保証を実施している（図４参照）。図４（ａ）中のテーパ基準長さは、ねじ部における耐シール性能を示すテーパ量を求める際の基準値であり、シール部径Ｄｓは、シール部における耐シール性能を示す代表値である。図４（ｂ）中のＤは、ねじ山高さを求める際のねじ谷の外径を示す。 The screw formed at the pipe end of the oil well pipe is screwed to the screw joint. Since oil well pipes connected by screw joints are used under severe conditions, the sealing performance at the joints is important.
Therefore, the thread shape is measured to determine the thread height, taper amount, seal portion diameter Ds, etc., and quality assurance is carried out (see FIG. 4). The taper reference length in FIG. 4A is a reference value for obtaining the taper amount indicating the seal resistance performance at the thread portion, and the seal portion diameter Ds is a representative value indicating the seal resistance performance at the seal portion. . D in FIG.4 (b) shows the outer diameter of the thread valley at the time of calculating | requiring thread height.

これらのうち、たとえばシール部径Ｄｓを測定するには、メカゲージを用いて測定員が測定していたが、このような測定器具を用いてねじ形状を全周にわたり測定すると、時間がかかり、測定員も必要となる。このことから、ねじ形状全周測定装置が提案されている（たとえば特許文献１）。
特許文献１に記載のねじ形状全周測定装置は、図５（ａ）に示したように、平行光２ａを被測定対象物のねじ部に照射する照射手段２と、ねじ部を通過した光とねじ部で遮蔽された光とで形成されるねじ部のシルエット像を投影板上に投影し、該シルエット像を撮像する撮像手段であるカメラ１とからなる光学系を４対有し、４対の光学系を前記被測定対象物の外周回りに回転可能な構成とし、撮像手段がＣＣＤ素子を有するラインセンサカメラとされている。このねじ形状全周測定装置によれば、高精細、高分解能のＣＣＤ素子を用いることで、数μm〜数十μmの測定精度を得ることができる。また、カメラ出力として、図５（ｂ）に示した２次元シルエット像14が得られ、図５（ｃ）に示した３次元ねじ形状を短時間でかつ高精度に測定することができる。 Among these, for example, a measurement member measures using a mechanical gauge to measure the seal portion diameter Ds. However, when the screw shape is measured over the entire circumference using such a measuring instrument, it takes time. Personnel are also required. From this, a screw shape all-around measuring device has been proposed (for example, Patent Document 1).
As shown in FIG. 5A, the screw shape all-around measuring apparatus described in Patent Document 1 is configured to irradiate parallel light 2a onto the screw portion of the object to be measured, and light that has passed through the screw portion. And a pair of optical systems including a camera 1 which is an imaging means for projecting a silhouette image of a screw portion formed by the light shielded by the screw portion onto a projection plate and capturing the silhouette image. The pair of optical systems is configured to be rotatable around the outer circumference of the object to be measured, and the imaging means is a line sensor camera having a CCD element. According to this screw shape all-around measuring apparatus, measurement accuracy of several μm to several tens of μm can be obtained by using a high-definition, high-resolution CCD element. Further, the two-dimensional silhouette image 14 shown in FIG. 5B is obtained as the camera output, and the three-dimensional screw shape shown in FIG. 5C can be measured in a short time with high accuracy.

またさらに、1対の光学系を構成する照射手段２、カメラ１の好適例を図６に示した。
光源からの光を平行光２ａとするテレセントリック投光レンズ系２ｂが組み込まれた照射手段２と、受光レンズ１ａ、テレセントリック受光レンズ系１ｂ、撮像素子（リニアアレイＣＣＤ）１ｃ、回転ミラー１ｄが組み込まれたカメラ１とからなり、カメラ１に画像入力装置４、ねじ形状演算装置５が接続されている。
特開2007-10393号公報 Further, FIG. 6 shows a preferred example of the irradiation means 2 and the camera 1 constituting a pair of optical systems.
An illuminating means 2 incorporating a telecentric projection lens system 2b that converts light from a light source into parallel light 2a, a light receiving lens 1a, a telecentric light receiving lens system 1b, an imaging device (linear array CCD) 1c, and a rotating mirror 1d are incorporated. An image input device 4 and a screw shape arithmetic device 5 are connected to the camera 1.
Japanese Unexamined Patent Publication No. 2007-10393

ここで、従来の油井管ねじ形状全周測定においては、光学系の回転開始時点における周方向位置を起点（０度）とし、光学系を搭載した回転架台の回転軸中心周りの角度を検出するセンサ（回転角度センサと以下いう）で検出した回転角度と、ねじ形状全周測定画像情報とを対応させて、ＨＤＤ装置などの情報記憶保存手段に保存していた。このようにする理由は、油井管の管端部に疵を付けてその疵の位置を、光学系の回転開始時点における周方向起点位置としたのでは、継ぎ手部でのシール性能を損なうからである。   Here, in the conventional oil well pipe thread shape all-around measurement, the circumferential position at the start of rotation of the optical system is set as the starting point (0 degree), and the angle around the rotation axis center of the rotary mount on which the optical system is mounted is detected. The rotation angle detected by a sensor (hereinafter referred to as a rotation angle sensor) and the screw shape all-round measurement image information are associated with each other and stored in an information storage unit such as an HDD device. The reason for this is that if a flange is attached to the pipe end of the oil well pipe and the position of the flange is set as the circumferential starting position at the start of rotation of the optical system, the sealing performance at the joint is impaired. is there.

このため、以下のような問題があった。
（１）油井管の使用時に油漏れが生じた場合、ねじ形状全周測定画像情報のうちから、リーク位置での画像情報を特定することができないため、ねじ形状とリーク原因の関係の追跡調査が困難となる。
（２）油井管のユーザがメカゲージなどの測定器具を用い、ある周方向位置でねじ形状を測定した場合に、その測定値と、出荷前に行った油井管ねじ形状全周測定で得られた結果とが一致しないという問い合わせがあると、既に現品がユーザ側にあること、しかも従来の油井管ねじ形状全周測定においては、光学系の回転開始時点における周方向位置を起点（０度）とし、ねじ形状全周測定画像情報とを対応させて情報記憶保存手段に保存しているため、問い合わせに対応するのが困難となる。 For this reason, there were the following problems.
(1) If oil leaks occur during use of an oil well pipe, the image information at the leak position cannot be specified from the screw shape all-around measurement image information. It becomes difficult.
(2) When a user of an oil well pipe uses a measuring instrument such as a mechanical gauge to measure the screw shape at a certain circumferential position, the measured value and the oil well pipe screw shape all-round measurement performed before shipment were obtained. If there is an inquiry that the results do not match, the actual product is already on the user side, and in the conventional oil well pipe thread shape all-round measurement, the circumferential position at the start of rotation of the optical system is the starting point (0 degree). Since the screw shape all-round measurement image information is stored in the information storage storage unit in association with it, it is difficult to respond to the inquiry.

したがって、従来の油井管ねじ形状全周測定においては、上記（１）、（２）を解決することが課題となっていた。
そこで本発明は、上記従来技術の問題点を解消し、少なくとも1対の光学系を油井管のねじ部周りに回転させて得られるねじ形状全周測定画像情報を活用するに際し、目視でも認識できる周方向起点位置に対応させてねじ形状全周測定画像情報を保存することができる、油井管ねじ形状全周測定における周方向起点位置の設定装置を提供することを目的とする。 Therefore, in the conventional oil well pipe thread shape all-around measurement, it has been a problem to solve the above (1) and (2).
Therefore, the present invention solves the above-described problems of the prior art, and can be visually recognized when utilizing the screw shape circumference measurement image information obtained by rotating at least one pair of optical systems around the threaded portion of the oil well pipe. It is an object of the present invention to provide a setting device for a circumferential starting point position in oil well tube screw shape all-round measurement capable of storing screw shape all-round measuring image information in correspondence with a circumferential starting point position.

本発明者は、従来の油井管ねじ形状全周測定における問題点に関し鋭意検討した結果、ねじ部先端に形成されている凹状または凸状の筋の始まり位置を、目視でも認識できる周方向起点位置とすることで、上記課題を解決できることを見出し、この知見に基づいて本発明をなすに至った。
すなわち本発明は、以下のとおりである。
１．光源からの光を平行光として被測定対象物の油井管のねじ部に照射する照射手段と、被測定対象物を挟んで対向配置され、被測定対象物の周囲を通過した平行光と被測定対象物で遮蔽された平行光とで形成されるシルエット像を撮像する撮像素子を有するカメラとを具備する少なくとも1対の光学系を、油井管のねじ部周りに回転させる方式の油井管ねじ形状全周測定において、前記光学系を回転させて得られるねじ形状全周測定画像情報を、前記光学系の回転開始時点における周方向位置を起点（０度）として、各画像情報のシルエット像を撮像したときの前記光学系の回転角に対応させて記憶する情報記憶保存手段と、該情報記憶保存手段から当該油井管のねじ部に関する画像情報を読み出し、当該油井管のねじ部に関する画像情報のうちから前記前記ねじ部の先端に凹状または凸状の筋の始まり位置を特徴にもつシルエット像の登録画像情報の特徴と一致するものを抽出する画像情報処理手段と、該画像情報処理手段での処理に基づき、前記凹状または凸状の筋の始まり位置を特徴にもつ画像情報が撮像されたときの回転角度を、油井管ねじ形状全周測定における周方向起点位置（0度）に設定する起点位置設定手段と、を具備したことを特徴とする油井管ねじ形状全周測定における周方向起点位置の設定装置。
２．前記光学系の回転角を検出するセンサは、光学系を搭載した回転架台の回転軸中心周りの角度を検出する回転角度センサであることを特徴とする上記１．に記載の油井管ねじ形状全周測定における周方向起点位置の設定装置。
３．前記情報記憶保存手段に、予めねじ形状に応じた凹状または凸状の筋の始まり位置を特徴にもつシルエット像の登録画像情報を記憶しておくことを特徴とする上記１．または２．に記載の油井管ねじ形状全周測定における周方向起点位置の設定装置。 As a result of intensive studies on problems in conventional oil well pipe screw shape all-around measurement, the present inventor has found that the starting position of the concave or convex streaks formed at the tip of the threaded portion can be recognized visually. As a result, it was found that the above-mentioned problems can be solved, and the present invention has been made based on this finding.
That is, the present invention is as follows.
1. Irradiation means for irradiating the threaded portion of the oil well pipe of the object to be measured as parallel light with the light from the light source, and the parallel light passing through the periphery of the object to be measured, which are arranged opposite to each other with the object to be measured being measured An oil well pipe thread shape of a system in which at least one optical system including a camera having an image pickup device that captures a silhouette image formed by parallel light shielded by an object is rotated around a thread portion of the oil well pipe In all-round measurement, the screw-shaped all-round measurement image information obtained by rotating the optical system is taken as a silhouette image of each image information starting from the circumferential position at the start of rotation of the optical system (0 degree). Information storage and storage means for storing corresponding to the rotation angle of the optical system, and image information relating to the threaded portion of the oil well pipe from the information storage and saving means, and out of image information relating to the threaded portion of the oil well pipe The image information processing means for extracting the silhouette image having the feature of the registered image information of the silhouette image characterized by the start position of the concave or convex streak at the tip of the screw portion, and the processing by the image information processing means Starting position for setting the rotation angle when image information characterized by the starting position of the concave or convex streaks is taken as the circumferential starting position (0 degree) in the oil well pipe screw shape circumference measurement An apparatus for setting a circumferential starting point position in oil well tube screw-shaped all-round measurement.
2. The sensor for detecting a rotation angle of the optical system is a rotation angle sensor for detecting an angle around a rotation axis center of a rotary mount on which the optical system is mounted. The setting device of the circumferential direction starting position in the oil well pipe thread shape all-around measurement described in 1.
3. 1. The registered image information of a silhouette image characterized by the start position of a concave or convex streak corresponding to the screw shape is stored in the information storage storage means in advance. Or 2. The setting device of the circumferential direction starting position in the oil well pipe thread shape all-around measurement described in 1.

本発明によれば、少なくとも1対の光学系を油井管のねじ部周りに回転させて得られるねじ形状全周測定画像情報を活用するに際し、目視でも認識できる周方向起点位置に対応させてねじ形状全周測定画像情報を記憶した情報を提供することができる。
したがって、前記した課題（１）、（２）を解決できる。 According to the present invention, when utilizing the screw shape full circumference measurement image information obtained by rotating at least one pair of optical systems around the threaded portion of the oil well pipe, the screw is made to correspond to the circumferential starting point position that can be recognized visually. Information storing shape all-round measurement image information can be provided.
Therefore, the above problems (1) and (2) can be solved.

本発明について図を用いて説明する。
図１は、本発明法を実施するための、周方向起点位置の設定装置の構成図であり、図２は、本発明法による効果を示す説明図である。また、図３は、本発明法を実施するための、凹状または凸状の筋の始まり位置を特徴にもつシルエット像の模式図である。図３中、Ｗ２は矩形状の完全ねじを示し、Ｗ３は３角形状の不完全ねじを示す。凸状の筋Ｓ１は、３角形状の不完全ねじＷ３が形成され始める始まり位置から生じ、凹状の筋Ｓ２は、３角形状の不完全ねじＷ３に矩形状の完全ねじＷ２が形成され始める始まり位置から生じる。 The present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a setting device for a circumferential starting point position for carrying out the method of the present invention, and FIG. 2 is an explanatory diagram showing the effect of the method of the present invention. FIG. 3 is a schematic diagram of a silhouette image characterized by the start position of a concave or convex streak for carrying out the method of the present invention. In FIG. 3, W2 represents a rectangular complete screw, and W3 represents a triangular incomplete screw. The convex streak S1 arises from the start position where the triangular incomplete screw W3 begins to be formed, and the concave streak S2 begins from the start of forming the rectangular complete screw W2 on the triangular incomplete screw W3. Arise from position.

ここで、図１に示した、回転架台９に搭載されている1対の光学系３は、回転角度センサ８で回転架台９の回転角を検出しつつ、回転用サーボモータ７で油井管Ｗの管端部における軸芯Ｗ１周りに回転される。この図１には、カメラ１と照射手段２とからなる1対の光学系３を回転架台９に搭載した場合を示したが、複数対の光学系を回転架台９に搭載し、ねじ形状を全周にわたり測定することも本発明に含む。なお、クランプ装置13は、油井管Ｗの搬送設備で搬送されてきた油井管Ｗの、前側である管端部が装置内に収まったときに、その後側をクランプする装置である。   Here, the pair of optical systems 3 mounted on the rotating gantry 9 shown in FIG. 1 detects the rotation angle of the rotating gantry 9 with the rotation angle sensor 8, and the oil well W with the rotating servo motor 7. Is rotated around the axis W1 at the tube end. Although FIG. 1 shows a case where a pair of optical systems 3 composed of a camera 1 and an irradiation means 2 are mounted on a rotating mount 9, a plurality of pairs of optical systems are mounted on the rotating mount 9, and the screw shape is changed. Measuring over the entire circumference is also included in the present invention. The clamping device 13 is a device that clamps the rear side of the oil well pipe W that has been transported by the transport equipment for the oil well pipe W when the pipe end that is the front side is within the apparatus.

本発明の特徴は、少なくとも1対の光学系を油井管Ｗの周りに回転させる方式の油井管ねじ形状全周測定において、情報記憶保存手段６ａと、該情報記憶保存手段６ａから油井管Ｗのねじ部に関する画像情報を読み出し、当該油井管Ｗのねじ部に関する画像情報のうちからねじ部先端に凹状または凸状の筋の始まり位置を特徴にもつシルエット像の登録画像情報の特徴と一致するものを抽出する画像情報処理手段６ｂと、該画像情報処理手段６ｂでの処理に基づき、凹状または凸状の筋の始まり位置を特徴にもつ画像情報が撮像されたときの回転角度を、油井管ねじ形状全周測定における周方向起点位置（0度）に設定する起点位置設定手段６ｃと、を具備したことを特徴とする。   The feature of the present invention is that, in the oil well pipe thread shape all-round measurement in which at least one pair of optical systems is rotated around the oil well pipe W, the information storage storage means 6a and the information storage storage means 6a to the oil well pipe W The image information related to the threaded portion is read, and the image information related to the threaded portion of the oil well pipe W matches the feature of the registered image information of the silhouette image characterized by the start position of the concave or convex streak at the screw tip. An image information processing means 6b for extracting the image, and a rotation angle when image information characterized by the start position of the concave or convex streaks is imaged based on the processing in the image information processing means 6b. And a starting point position setting means 6c for setting the starting point position in the circumferential direction (0 degree) in the measurement of the entire circumference of the shape.

なお、回転架台９は、ベース10上にメインスライド11、４軸駆動の光学系焦点ずれ補正調整機構12を介して載せられている。メインスライド11は油井管Ｗの長手方向にスライドし、光学系焦点ずれ補正調整機構12は上下位置調整、左右位置調整、前後傾斜調整、水平面回転調整であり、カメラ１の受光レンズ１ａから油井管Ｗの軸芯Ｗ１までの距離（ねじ部までの距離に相当）を一定にできる。また、画像入力装置４、ねじ形状演算装置５は、従来と同様に測定用コンピュータ内に設けられている。情報記憶保存手段６ａと、画像情報処理手段６ｂと、起点位置設定手段６ｃとを具備した周方向起点位置の設定装置も、測定用コンピュータ内に設けることができる。   The rotary base 9 is placed on a base 10 via a main slide 11 and a four-axis drive optical system defocus correction adjustment mechanism 12. The main slide 11 slides in the longitudinal direction of the oil well pipe W, and the optical system defocus correction adjustment mechanism 12 performs vertical position adjustment, left and right position adjustment, front and rear tilt adjustment, and horizontal plane rotation adjustment. From the light receiving lens 1a of the camera 1 to the oil well pipe The distance to the axial center W1 of W (corresponding to the distance to the threaded portion) can be made constant. The image input device 4 and the screw shape calculation device 5 are provided in the measurement computer as in the conventional case. A setting device for the circumferential starting point position including the information storage / storing unit 6a, the image information processing unit 6b, and the starting point position setting unit 6c can also be provided in the measurement computer.

まず、情報記憶保存手段６ａについて説明する
（情報記憶保存手段６ａについて）
情報記憶保存手段６ａは、たとえばＨＤＤ装置とされ、画像入力装置４、ねじ形状演算装置５を介してカメラ１と接続されている。この情報記憶保存手段６ａには、1対の光学系を回転させて得られるねじ形状全周測定画像情報が、光学系の回転開始時点における周方向位置を起点（０度）とした、光学系３の回転角と対応させて記憶される。 First, the information storage storage means 6a will be described (information storage storage means 6a).
The information storage / save means 6 a is, for example, an HDD device, and is connected to the camera 1 via the image input device 4 and the screw shape calculation device 5. In this information storage and storage means 6a, the screw-shaped all-round measurement image information obtained by rotating a pair of optical systems is an optical system whose starting position (0 degree) is the circumferential position at the start of rotation of the optical system. 3 corresponding to the rotation angle.

この情報記憶保存手段６ａに記憶される光学系３の回転角は、光学系を搭載した回転架台９の回転軸中心周りの角度を検出する回転角度センサ８で検出される。また、この情報記憶保存手段６ａには、予めねじ形状に応じた凹状または凸状の筋の始まり位置を特徴にもつシルエット像の登録画像情報を記憶しておく。このようにしておくことで、当該油井管Ｗのねじ部に関する画像情報を以下のようにして抽出する。
（画像情報処理手段６ｂについて）
画像情報処理手段６ｂは、情報記憶保存手段６ａに予め登録しておいた凹状または凸状の筋の始まり位置を特徴にもつシルエット像の登録画像情報のうちから、当該ねじ形状と合致した登録画像情報を呼び出す。その登録画像情報のシルエット像の一例を図３に示した。 The rotation angle of the optical system 3 stored in the information storage / save means 6a is detected by a rotation angle sensor 8 that detects an angle around the rotation axis center of the rotary mount 9 on which the optical system is mounted. The information storage / save means 6a stores in advance registered image information of a silhouette image characterized by the start position of a concave or convex line corresponding to the screw shape. By doing in this way, the image information regarding the thread part of the said oil well pipe W is extracted as follows.
(About image information processing means 6b)
The image information processing means 6b is a registered image that matches the screw shape from the registered image information of the silhouette image characterized by the start position of the concave or convex streak registered in advance in the information storage storage means 6a. Recall information. An example of the silhouette image of the registered image information is shown in FIG.

すなわち、図３中の（ａ）または（ｃ）に示したように、凸状の筋Ｓ１の始まり位置、または凹状の筋Ｓ２の始まり位置を特徴にもつシルエット像の登録画像情報が情報記憶保存手段６ａに登録されている。この登録画像情報と、光学系の回転開始時点における周方向位置を起点（０度）として、情報記憶保存手段６ａに記憶した当該油井管Ｗのねじ部に関する画像情報を読み出して対比することで、当該油井管Ｗのねじ部に関する画像情報のうちから、矩形状の完全ねじＷ２が形成される凹状の筋Ｓ２の始まり位置、または３角形状の不完全ねじＷが形成される凸状の筋Ｓ１の始まり位置を特徴にもつシルエット像の登録画像情報の特徴と一致するものを抽出する。
（起点位置設定手段６ｃについて）
起点位置設定手段６ｃは、前記した画像情報処理手段６ｂでの処理に基づき、凹状または凸状の筋の始まり位置を特徴にもつ画像情報が撮像されたときの回転角度を、油井管ねじ形状全周測定における周方向起点位置（0度）に設定する。 That is, as shown in (a) or (c) of FIG. 3, the registered image information of the silhouette image characterized by the start position of the convex streak S1 or the start position of the concave streak S2 is stored as information. It is registered in the means 6a. By reading out and comparing this registered image information with the circumferential position at the start of rotation of the optical system as the starting point (0 degree), the image information relating to the threaded portion of the oil well pipe W stored in the information storage storage means 6a is compared. From the image information regarding the threaded portion of the oil well pipe W, the starting position of the concave line S2 where the rectangular complete screw W2 is formed, or the convex line S1 where the triangular incomplete screw W is formed. The one that matches the feature of the registered image information of the silhouette image having the beginning position of the feature is extracted.
(Starting point setting means 6c)
Based on the processing by the image information processing means 6b described above, the starting position setting means 6c determines the rotation angle when image information characterized by the start position of a concave or convex streak is imaged, Set to the circumferential starting position (0 degree) for circumference measurement.

つまり、情報記憶保存手段６ａにアクセスし、ねじ形状全周測定画像情報が、光学系の回転開始時点における周方向位置を起点（０度）として記憶されている回転角度の書き換えを行う。その結果を図２に示した。
この場合、凹状の筋Ｓ２の始まり位置を、油井管ねじ形状全周測定における周方向起点位置（0度）に設定したが、凸状の筋Ｓ１の始まり位置を周方向起点位置（0度）に設定してもよい。どちらの場合も、情報記憶保存手段６ａには、ねじ形状全周測定画像情報が、ねじ部先端に形成されている凹状または凸状の筋の始まり位置を周方向起点位置として記憶・保存される。 That is, the information storage storage unit 6a is accessed to rewrite the rotation angle stored in the screw shape all-round measurement image information starting from the circumferential position at the start of rotation of the optical system (0 degree). The results are shown in FIG.
In this case, the starting position of the concave streak S2 is set to the circumferential starting point position (0 degree) in the measurement of the entire circumference of the oil well pipe thread shape, but the starting position of the convex streak S1 is set to the circumferential starting position (0 degree). May be set. In either case, in the information storage / save means 6a, the screw shape all-round measurement image information is stored / stored with the start position of the concave or convex streak formed at the tip of the screw portion as the circumferential start point position. .

そこで、少なくとも1対の光学系を回転させて得られるねじ形状全周測定画像情報を活用するに際し、目視でも認識できる周方向起点位置に対応させてねじ形状全周測定画像情報を記憶した情報を提供することができる。
したがって、以下のようなことがあったとしても対応が容易にできる。
（１）油井管の使用時に油漏れが生じた場合、ねじ形状全周測定画像情報のうちから、リーク位置での画像情報を容易に特定することができ、ねじ形状とリーク原因の関係の追跡調査ができる。 Therefore, when utilizing the screw shape all-round measurement image information obtained by rotating at least one pair of optical systems, the information storing the screw shape all-round measurement image information corresponding to the circumferential start point position that can be visually recognized is stored. Can be provided.
Therefore, even if the following occurs, it can be easily handled.
(1) When oil leakage occurs when using an oil well pipe, the image information at the leak position can be easily identified from the screw shape all-around measurement image information, and the relationship between the screw shape and the cause of the leak can be tracked. Can investigate.

（２）油井管のユーザがメカゲージなどの測定器具を用い、ある周方向位置でねじ形状を測定した場合に、その測定値と、出荷前に行った油井管ねじ形状全周測定で得られた結果とが一致しないという問い合わせがあっても、目視でも認識できる周方向起点位置に対応させてねじ形状全周測定画像情報を記憶した情報を提供することができるため、問い合わせに対応するのが容易となる。   (2) When a user of an oil well pipe uses a measuring instrument such as a mechanical gauge to measure the screw shape at a certain circumferential position, the measured value and the oil well pipe screw shape all-round measurement performed before shipment were obtained. Even if there is an inquiry that the result does not match, it is possible to provide information storing screw shape all-round measurement image information corresponding to the circumferential starting point position that can be recognized visually, so it is easy to respond to the inquiry It becomes.

本発明法を実施するための、周方向起点位置の設定装置の構成図である。It is a block diagram of the setting apparatus of the circumferential direction starting point position for implementing this invention method. 本発明法による効果を示す説明図である。It is explanatory drawing which shows the effect by this invention method. 本発明法を実施するための、凹状または凸状の筋の始まり位置を特徴にもつシルエット像の模式図である。It is a schematic diagram of a silhouette image characterized by the start position of a concave or convex line for carrying out the method of the present invention. ねじの形状特性値を示す断面図である。It is sectional drawing which shows the shape characteristic value of a screw. （ａ）は4対の光学系を用いたねじ形状測定装置の構成図、（ｂ）はそれで得られるシルエット像の模式図、（ｃ）はシルエット像に基づいて作成したねじ形状の３次元画像の斜視図である。(A) is a block diagram of a screw shape measuring apparatus using four pairs of optical systems, (b) is a schematic diagram of a silhouette image obtained therefrom, and (c) is a three-dimensional image of a screw shape created based on the silhouette image. FIG. １対の光学系の内部構成を示す構成図である。It is a block diagram which shows the internal structure of a pair of optical system.

符号の説明Explanation of symbols

Ｗ 油井管（被測定対象物）
Ｗ１ 管端部における軸芯
Ｗ２ 完全ねじ
Ｗ３ 不完全ねじ
Ｓ１ 凸状の筋
Ｓ２ 凹状の筋
Ｄ ねじ谷の外径
Ｄｓ シール部径
１ カメラ
１ａ 受光レンズ
１ｂ テレセントリック受光レンズ系
１ｃ 撮像素子（リニアアレイＣＣＤ）
１ｄ 回転ミラー
２ 照射手段
２ａ 平行光
２ｂ テレセントリック投光レンズ系
３ １対の光学系
４ 画像入力装置
５ ねじ形状演算装置
６ａ 情報記憶保存手段
６ｂ 画像情報処理手段
６ｃ 起点位置設定手段
７ 回転用サーボモータ
８ 回転角度センサ
９ 回転架台
10 ベース
11 メインスライド
12 光学系焦点ずれ補正調整機構
13 クランプ装置
14 2次元のシルエット像 W oil well pipe (object to be measured)
W1 Axle at tube end W2 Complete screw W3 Incomplete screw S1 Convex streak S2 Concave streak D Outer diameter of thread valley Ds Seal part diameter 1 Camera 1a Light receiving lens 1b Telecentric light receiving lens system 1c Image sensor (linear array CCD) )
DESCRIPTION OF SYMBOLS 1d Rotating mirror 2 Irradiation means 2a Parallel light 2b Telecentric projection lens system 3 Pair of optical systems 4 Image input device 5 Screw shape arithmetic unit 6a Information storage storage means 6b Image information processing means 6c Starting position setting means 7 Servo motor for rotation 8 Rotation angle sensor 9 Rotation base
10 base
11 Main slide
12 Optical system defocus correction adjustment mechanism
13 Clamping device
14 Two-dimensional silhouette image

Claims (3)

光源からの光を平行光として被測定対象物の油井管のねじ部に照射する照射手段と、被測定対象物を挟んで対向配置され、被測定対象物の周囲を通過した平行光と被測定対象物で遮蔽された平行光とで形成されるシルエット像を撮像する撮像素子を有するカメラとを具備する少なくとも1対の光学系を、油井管のねじ部周りに回転させる方式の油井管ねじ形状全周測定において、
前記光学系を回転させて得られるねじ形状全周測定画像情報を、前記光学系の回転開始時点における周方向位置を起点（０度）として、各画像情報のシルエット像を撮像したときの前記光学系の回転角に対応させて記憶する情報記憶保存手段と、該情報記憶保存手段から当該油井管のねじ部に関する画像情報を読み出し、当該油井管のねじ部に関する画像情報のうちから前記凹状または凸状の筋の始まり位置を特徴にもつシルエット像の登録画像情報の特徴と一致するものを抽出する画像情報処理手段と、該画像情報処理手段での処理に基づき、前記ねじ部の先端に凹状または凸状の筋の始まり位置を特徴にもつ画像情報が撮像されたときの回転角度を、油井管ねじ形状全周測定における周方向起点位置（0度）に設定する起点位置設定手段と、を具備したことを特徴とする油井管ねじ形状全周測定における周方向起点位置の設定装置。 Irradiation means for irradiating the threaded portion of the oil well pipe of the object to be measured as parallel light with the light from the light source, and the parallel light passing through the periphery of the object to be measured, which are arranged opposite to each other with the object to be measured being measured An oil well pipe thread shape of a system in which at least one optical system including a camera having an image pickup device that captures a silhouette image formed by parallel light shielded by an object is rotated around a thread portion of the oil well pipe In all-round measurement,
The optical image obtained when a screw-shaped all-round measurement image information obtained by rotating the optical system is taken as a silhouette image of each image information starting from a circumferential position at the time of starting rotation of the optical system (0 degree). Information storage storage means for storing corresponding to the rotation angle of the system, image information relating to the threaded portion of the oil well pipe is read from the information storage saving means, and the concave or convex shape is read out of the image information relating to the threaded portion of the oil well pipe. An image information processing means for extracting a silhouette image that matches the feature of the registered image information of the silhouette image characterized by the start position of the line-shaped streak, and a concave or Starting position setting means for setting the rotation angle when image information characterized by the starting position of the convex streak is imaged to the circumferential starting position (0 degree) in oil well pipe thread shape circumference measurement; A device for setting a circumferential starting point position in oil well tube screw shape all-around measurement. 前記光学系の回転角を検出するセンサは、光学系を搭載した回転架台の回転軸中心周りの角度を検出する回転角度センサであることを特徴とする請求項１に記載の油井管ねじ形状全周測定における周方向起点位置の設定装置。 2. The oil well pipe screw-shaped all-in-one according to claim 1, wherein the sensor that detects a rotation angle of the optical system is a rotation angle sensor that detects an angle around a rotation axis center of a rotary mount on which the optical system is mounted. A setting device for the circumferential starting position in circumferential measurement. 前記情報記憶保存手段に、予めねじ形状に応じた凹状または凸状の筋の始まり位置を特徴にもつシルエット像の登録画像情報を記憶しておくことを特徴とする請求項１または２に記載の油井管ねじ形状全周測定における周方向起点位置の設定装置。 3. The registered image information of a silhouette image characterized by the start position of a concave or convex line corresponding to the screw shape is stored in the information storage storage unit in advance. A setting device for the position of the starting point in the circumferential direction in the measurement of the oil well pipe thread shape.
JP2008198246A 2008-07-31 2008-07-31 Device for setting the position of the starting point in the circumferential direction in oil well pipe thread shape all-round measurement Expired - Fee Related JP5146181B2 (en)

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JP2013527470A (en) * 2010-06-01 2013-06-27 テナリス・コネクシヨンズ・リミテツド Method for measuring geometric parameters of coated screw joints
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