JPH0615552A - Pipe interior grinder - Google Patents

Abstract

PURPOSE:To enable it to partially grind a pipe interior surface. CONSTITUTION:This grinder is provided with a first eccentric axis O1 and a second eccentric axis O2 successively decentered to an axis O of a base pipe 8. In addition, it is also provided with an operating rod 9 liftable along the axis O. A driving shaft 17 equipped with a grinding wheel 21 at the upper end is set up on the second eccentric axis O2, making it revolvable with the first eccentric axis O1 as the center. In succession, the driving shaft 17 is revolved, adjusting a height position of the grinding wheel 21 via the driving shaft 17, and then this shaft 17 is revolved and a plane position of the grinding wheel 21 is adjusted, thus grinding is conducted by pressing the grinding wheel 21 to the interior surface of a pipe 2.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は原子炉圧力容器の底部を
貫通する小口径管の如き配管の内面を研磨するために用
いる管内面研磨機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe inner surface polishing machine used for polishing the inner surface of a pipe such as a small diameter pipe penetrating the bottom of a reactor pressure vessel.

【０００２】[0002]

【従来の技術】原子力発電プラントにおいては、図３に
一例を示す如く、原子炉圧力容器１の底部に、ＩＣＭ管
の如き小口径の管２が貫通導設されている。かかる管２
の内面には、所定の肉盛溶接等を行う必要があるが、溶
接作業が終了した後に、該溶接個所が部分的に管内面側
に突出しているような場合は、それを研磨整形する必要
がある。2. Description of the Related Art In a nuclear power plant, as shown in FIG. 3, a small-diameter pipe 2 such as an ICM pipe is penetratingly provided at the bottom of a reactor pressure vessel 1. Such a tube 2
It is necessary to perform a certain overlay welding on the inner surface of the pipe, but after the welding work is completed, if the welded part partially protrudes toward the pipe inner surface, it must be ground and shaped. There is.

【０００３】上記管２の内面を研磨する研磨手段として
は、従来、図４の（イ）に示す如く、フラップ状に形成
した多数のサンドペーパー３を、芯軸４に放射状に束ね
てなるフラップホイールと称する研磨具や、あるいは、
図４の（ロ）に示す如く、先端に小砥石５を取り付けた
索状物６を、縒芯７に適宜間隔にて支持させてなるフレ
ックスホーンと称する研磨具が用いられていた。As a polishing means for polishing the inner surface of the tube 2, conventionally, as shown in FIG. 4A, a flap formed by bundling a large number of flap-shaped sandpapers 3 radially on a core shaft 4 is used. A polishing tool called a wheel, or
As shown in (b) of FIG. 4, a polishing tool called a flex horn is used in which a cord 6 having a small grindstone 5 attached to its tip is supported by a spiral core 7 at appropriate intervals.

【０００４】[0004]

【発明が解決しようとする課題】ところが、上記研磨具
の場合、いずれも、管内に挿入して単に回転させるだけ
のものであるので、管内面を周方向で均等に研磨するこ
とはできるが、管内面の一部に溶接部などの突出部があ
っても、その突出部だけを部分的に研磨することはでき
ず、必要のない個所までも研磨してしまうという問題が
ある。However, in the case of the above-mentioned polishing tools, since all of them are simply inserted into the pipe and simply rotated, the inner surface of the pipe can be uniformly polished in the circumferential direction. Even if a part of the inner surface of the pipe has a protruding part such as a welded part, it is not possible to partially polish only the protruding part, and there is a problem that even unnecessary parts are polished.

【０００５】そこで、本発明は、管内面を周方向均等に
研磨できることは勿論のこと、必要な個所を部分的にだ
け研磨することもできるような管内面研磨機を提供しよ
うとするものである。Therefore, the present invention is intended to provide a pipe inner surface polishing machine capable of polishing the inner surface of the pipe evenly in the circumferential direction, and also capable of polishing only a required portion partially. .

【０００６】[0006]

【課題を解決するための手段】本発明は、上記課題を解
決するために、上下方向に延びる基管内に、該基管の軸
芯からずれた第１偏芯軸芯を中心とする偏芯孔部を有す
る操作ロッドを昇降可能に挿入し、該操作ロッドの偏芯
孔部の下端部に、上記第１偏芯軸芯からずれた第２偏芯
軸芯を有する下部偏芯リングを回転可能に支持させ、該
下部偏芯リングと上方の所要高さ位置に対向させて配置
した上部偏芯リングとを、上記第１偏芯軸芯を中心とす
る継手管にて連結し、且つ該継手管の外周部に、上端部
にて上記上部偏芯リングの外周面部を回転自在に支持す
ると共に下端部を上記操作ロッドの上端部に固定したガ
イド管を、上記基管の軸芯を中心として設け、更に、上
下の偏芯リング間に、上記第２偏芯軸芯を中心に回転駆
動可能とした駆動軸を上下方向の位置を定めて貫通配置
し、該駆動軸の上端部に研磨具を取り付けた構成とす
る。SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides an eccentricity centered on a first eccentric shaft center deviated from the shaft center of the base pipe in a vertically extending base pipe. An operation rod having a hole is inserted so that it can be moved up and down, and a lower eccentric ring having a second eccentric shaft center deviated from the first eccentric shaft center is rotated at the lower end of the eccentric hole of the operation rod. The lower eccentric ring and the upper eccentric ring, which is arranged so as to face the upper required height position, by a joint pipe having the first eccentric shaft center as a center, and A guide tube having an upper end portion rotatably supporting the outer peripheral surface portion of the upper eccentric ring and a lower end portion fixed to the upper end portion of the operation rod is attached to the outer peripheral portion of the joint pipe. And a drive capable of being rotationally driven about the second eccentric shaft center between the upper and lower eccentric rings. The penetrating arranged defining a vertical position, a configuration of attaching the abrasive article to the upper end of the drive shaft.

【０００７】[0007]

【作用】管内面を部分的に研磨する場合、研磨具が取り
付けてある上端側を管内に下端側から挿入して基管の位
置を固定する。次に、基管の軸芯に沿わせて操作ロッド
を昇降させると、駆動軸を介して研磨具の高さ位置を調
整することができる。続いて、駆動軸を第１偏芯軸芯を
中心として公転させると、研磨具の平面位置を調整する
ことができ、研磨具を管内面に押し付けることができ
る。したがって、この状態で駆動軸を駆動すると、研磨
具が管内面を部分的に研磨する。When the inner surface of the pipe is partially polished, the upper end side to which the polishing tool is attached is inserted into the pipe from the lower end side to fix the position of the base pipe. Next, when the operating rod is moved up and down along the axis of the base tube, the height position of the polishing tool can be adjusted via the drive shaft. Subsequently, when the drive shaft is revolved around the first eccentric shaft center, the planar position of the polishing tool can be adjusted and the polishing tool can be pressed against the inner surface of the tube. Therefore, when the drive shaft is driven in this state, the polishing tool partially polishes the inner surface of the tube.

【０００８】[0008]

【実施例】以下、本発明の実施例を図面を参照して説明
する。Embodiments of the present invention will be described below with reference to the drawings.

【０００９】図１及び図２の（イ）（ロ）は本発明の一
実施例を示すもので、内面を研磨すべき管２の下端フラ
ンジ２ａへの取付フランジ８ａを上端に有し且つ内ねじ
８ｂを設けた上下方向へ延びる基管８内に、下端部外周
面にハンドル差込穴９ａを有し且つ外ねじ９ｂを設けた
操作ロッド９を、上記基管８の軸芯Ｏと同芯状に挿入配
置して、上記両ねじ８ｂ，９ｂを螺合させ、上記ハンド
ル差込穴９ａに差し込んだハンドル１０の操作で操作ロ
ッド９を回転させることにより、該操作ロッド９が回転
しながら昇降させられるようにする。1 and 2 (a) and (b) show an embodiment of the present invention, which has a mounting flange 8a on the upper end and a lower end flange 2a of the pipe 2 whose inner surface is to be ground. An operating rod 9 having a handle insertion hole 9a on the outer peripheral surface of the lower end and an external screw 9b is provided in the base pipe 8 provided with a screw 8b and extending in the vertical direction. The operation rod 9 is rotated while the operation rod 9 is rotated by operating the handle 10 inserted into the handle insertion hole 9a by screwing the two screws 8b and 9b into the core. Be able to raise and lower.

【００１０】又、上記操作ロッド９内には、上端部に、
軸芯Ｏを中心とする真孔部９ｃを形成すると共に、上端
部を除く範囲に、軸芯Ｏからｅ₁ だけ偏芯させた第１偏
芯軸芯である軸芯Ｏ₁ を中心とする偏芯孔部９ｄを、上
記真孔部９ｃと連通するよう形成し、更に該偏芯孔部９
ｄの下端部位置に内ねじ９ｅを刻設し、該内ねじ９ｅ
に、上記軸芯Ｏ₁ からｅ₂ だけ偏芯させた第２偏芯軸芯
である軸芯Ｏ₂ を中心とする偏芯孔１２ａを有し且つ外
ねじ１２ｂを設けた下部偏芯リング１２を、上記外ねじ
１２ｂが螺合するように挿入し、一方、上記操作ロッド
９の上方所要高さ位置に、上記下部偏芯リング１２と同
様な偏芯孔１１ａを有する上部偏芯リング１１を対向さ
せて配置し、該上部偏芯リング１１と下部偏芯リング１
２との間を、上記軸芯Ｏ₁ と同芯状に配した継手管１３
にて連結し、且つ上記下部偏芯リング１２の下端部外周
面にハンドル差込穴１２ｃを形成して、該ハンドル差込
穴１２ｃに差し込んだハンドル２２の操作で下部偏芯リ
ング１２を回転させることにより、継手管１３を介して
上部偏芯リング１１を回転させられるようにし、更に、
上記上部偏芯リング１１の回転をガイドするように、上
記継手管１３の外周部に、軸芯Ｏと同芯状にガイド管１
４を配置して、該ガイド管１４の下端部を、上記操作ロ
ッド９の真孔部９ｃに固定支持させると共に、上記ガイ
ド管１４の上端部に、外周部をＭＣナイロン１５で被覆
した偏芯したガイドリング１６を設け、該ガイドリング
１６の内周部で上部偏芯リング１１の下部外周面を回転
自在に保持させるようにする。In the operation rod 9, the upper end is
To form a Maana portion 9c around the axial center O, the ranges excluding upper end, around the axial center O ₁ is a first eccentric axis which is eccentric by e ₁ from the axial center O The eccentric hole portion 9d is formed so as to communicate with the true hole portion 9c.
An inner screw 9e is engraved at the position of the lower end of d, and the inner screw 9e
A lower eccentric ring 12 having an eccentric hole 12a centered on an axis O ₂ which is a second eccentric axis which is eccentric from the axis O ₁ by e ₂ and provided with an external screw 12b. Is inserted so that the outer screw 12b is screwed, and the upper eccentric ring 11 having an eccentric hole 11a similar to the lower eccentric ring 12 is provided at a required height position above the operating rod 9. The upper eccentric ring 11 and the lower eccentric ring 1 are arranged so as to face each other.
A joint pipe 13 in which a portion between the two is arranged concentrically with the axis O _1.
And a handle insertion hole 12c is formed on the outer peripheral surface of the lower end portion of the lower eccentric ring 12, and the lower eccentric ring 12 is rotated by operating the handle 22 inserted in the handle insertion hole 12c. As a result, the upper eccentric ring 11 can be rotated via the joint pipe 13, and
In order to guide the rotation of the upper eccentric ring 11, the guide tube 1 is concentrically formed with the axis O on the outer peripheral portion of the joint tube 13.
4 is arranged so that the lower end portion of the guide tube 14 is fixedly supported by the true hole portion 9c of the operation rod 9 and the upper end portion of the guide tube 14 is covered with an MC nylon 15 at the outer peripheral portion. The guide ring 16 is provided, and the inner peripheral portion of the guide ring 16 rotatably holds the lower outer peripheral surface of the upper eccentric ring 11.

【００１１】更に、上記上部偏芯リング１１の偏芯孔１
１ａと下部偏芯リング１２の偏芯孔１２ａの間を貫通さ
せるように、下端部を駆動装置（図示せず）と連結でき
るようにした駆動軸１７を、軸芯Ｏ₂ 上に配置し、該駆
動軸１７の上、下端部外周に、それぞれスラスト軸受１
８及び取付座１９を介してナット２０を螺合させて、駆
動軸１７の上下方向の位置が回転自在に保持されるよう
にし、且つ上部のナット２０と取付座１９との間に、管
２の内面を研磨する研磨具としての砥石２１を取り付け
た構成とする。Further, the eccentric hole 1 of the upper eccentric ring 11
A drive shaft 17 whose lower end portion can be connected to a drive device (not shown) is disposed on the shaft center O ₂ so as to penetrate between the eccentric hole 12a of the lower eccentric ring 12 and 1a. The thrust bearing 1 is provided on the outer circumference of the upper and lower ends of the drive shaft 17, respectively.
8 and the mounting seat 19, the nut 20 is screwed so that the vertical position of the drive shaft 17 is rotatably held, and the pipe 2 is provided between the upper nut 20 and the mounting seat 19. A grindstone 21 as a polishing tool for polishing the inner surface of the is attached.

【００１２】なお、図中２３は駆動軸１７と継手管１３
との間隔を保持するための偏芯スペーサリング、２４は
継手管１３とガイド管１４との間隔を保持するための偏
芯スペーサリングを示す。又、２ｂは管２の内面の部分
的な研摩個所を示す。Reference numeral 23 in the drawing denotes a drive shaft 17 and a joint pipe 13.
An eccentric spacer ring for maintaining the space between the pipe and the reference pipe 24 is an eccentric spacer ring for maintaining the space between the joint pipe 13 and the guide pipe 14. Reference numeral 2b shows a part of the inner surface of the tube 2 which is to be polished.

【００１３】上記構成とした管内面研磨機を用いて管２
の内面にある部分的な研摩個所２ｂを研磨する場合に
は、先ず、砥石２１が取り付けてある先端（上端）側を
管２内に下端側から挿入して、管２の下端フランジ２ａ
に基管８の取付フランジ８ａを取り付け、研磨機全体を
管２側に保持させる。なお、この際、図２の（ロ）に示
す如く、砥石２１は管２内への挿入時に管２の内面に接
触しないように位置させておく。The pipe 2 is formed by using the pipe inner surface polishing machine having the above structure.
In the case of polishing the partial polishing portion 2b on the inner surface of the pipe 2, first, the tip (upper end) side to which the grindstone 21 is attached is inserted into the pipe 2 from the lower end side, and the lower end flange 2a of the pipe 2 is inserted.
The mounting flange 8a of the base pipe 8 is attached to the base pipe 8 to hold the entire polishing machine on the pipe 2 side. At this time, as shown in FIG. 2B, the grindstone 21 is positioned so as not to contact the inner surface of the tube 2 when it is inserted into the tube 2.

【００１４】次に、操作ロッド９の下端部外周面に形成
されているハンドル差込穴９ａにハンドル１０を差し込
み、該ハンドル１０の操作で操作ロッド９を回転させ
て、砥石２１の高さを研磨個所に対応させるようにす
る。すなわち、この場合、操作ロッド９を回転させる
と、操作ロッド９の外ねじ９ｂが基管８の内ねじ８ｂに
螺合しているため、操作ロッド９は回転しながら昇降さ
せられることになり、これに伴って、ガイド管１４、上
下の偏芯リング１１，１２を連結する継手管１３、駆動
軸１７等が一体に回転しながら昇降させられることにな
る。この際、回転中心は基管８の軸芯Ｏであるが、継手
管１３の軸芯Ｏ₁ は軸芯Ｏからｅ₁ だけ偏芯しているた
め、軸芯Ｏ₁ は軸芯Ｏの外周を公転させられることにな
る。したがって、この場合、操作ロッド９の回転により
砥石２１の高さ位置を研磨個所に合わせるようにする
が、このとき、同時に、図２の（ロ）に示す如く、軸芯
Ｏ₁ を軸芯Ｏと研磨個所２ｂの間に位置させるようにし
ておく。なお、この調整は、たとえば、ハンドル差込穴
９ａを操作ロッド９の最も肉厚が厚い位置に設けておく
ことにより容易に実施できる。又、上記砥石２１の高さ
調整時に、ガイド管１４の上端に取り付けてあるガイド
リング１６が管２の内面に対して摺動することになる
が、ガイドリング１６の外周面はＭＣナイロン１５で被
覆してあるため、管２の内面を傷付ける虞はない。Next, the handle 10 is inserted into the handle insertion hole 9a formed on the outer peripheral surface of the lower end portion of the operating rod 9, and the operating rod 9 is rotated by the operation of the handle 10 to adjust the height of the grindstone 21. Make it correspond to the polishing point. That is, in this case, when the operating rod 9 is rotated, the outer screw 9b of the operating rod 9 is screwed into the inner screw 8b of the base pipe 8, so that the operating rod 9 is raised and lowered while rotating. Along with this, the guide tube 14, the joint tube 13 connecting the upper and lower eccentric rings 11 and 12, the drive shaft 17, and the like are raised and lowered while integrally rotating. At this time, the center of rotation is the axis O of the base tube 8, but the axis O ₁ of the joint tube 13 is eccentric from the axis O by e _1, so that the axis O ₁ is the outer periphery of the axis O. Will be revolved around. Therefore, in this case, although to align the height position of the grinding wheel 21 by the rotation of the operating rod 9 to the polishing location, this time, at the same time, as shown in FIG. 2 (b), the axial center O ₁ axial center O And the polishing point 2b. Note that this adjustment can be easily performed, for example, by providing the handle insertion hole 9a at a position where the operation rod 9 has the largest wall thickness. Further, when the height of the grindstone 21 is adjusted, the guide ring 16 attached to the upper end of the guide tube 14 slides on the inner surface of the tube 2, but the outer peripheral surface of the guide ring 16 is made of MC nylon 15. Since it is covered, there is no risk of damaging the inner surface of the tube 2.

【００１５】砥石２１の高さを設定した後、続いて、下
部偏芯リング１２の下端部外周面に形成されているハン
ドル差込穴１２ｃにハンドル２２を差し込み、該ハンド
ル２２の操作で下部偏芯リング１２を回転させて、砥石
２１の平面位置を調整して砥石２１の周面を研磨個所に
押し付けるようにする。すなわち、この場合、下部偏芯
リング１２を回転させると、継手管１３を介して上部偏
芯リング１２が一体に回転させられることになり、更
に、スラスト軸受１８、取付座１９、ナット２０等を介
して駆動軸１７も一体に回転させられることになる。こ
の際、回転中心は操作ロッド９の偏芯孔部９ｄの中心と
なる軸芯Ｏ₁ であるが、駆動軸１７の軸芯Ｏ₂ は軸芯Ｏ
₁ からｅ₂ だけ偏芯しているため、軸芯Ｏ₂ は軸芯Ｏ₁
の外周を公転させられることになる。したがって、図２
の（イ）に示す如く、軸芯Ｏ₂ を軸芯Ｏ₁ と研磨個所２
ｂとの間に位置させるように調整することにより、砥石
２１を研磨個所２ｂに押し付けることができる。なお、
この調整も、たとえば、ハンドル差込穴１２ｃを下部偏
芯リング１２の最も肉厚が厚い位置に設けておくことに
より容易に実施できる。After setting the height of the grindstone 21, the handle 22 is inserted into the handle insertion hole 12c formed on the outer peripheral surface of the lower end portion of the lower eccentric ring 12, and the lower eccentric is operated by operating the handle 22. The core ring 12 is rotated to adjust the plane position of the grindstone 21 so that the peripheral surface of the grindstone 21 is pressed against the polishing point. That is, in this case, when the lower eccentric ring 12 is rotated, the upper eccentric ring 12 is integrally rotated through the joint pipe 13, and further, the thrust bearing 18, the mounting seat 19, the nut 20, etc. The drive shaft 17 can also be rotated integrally therewith. At this time, the center of rotation is the axis O ₁ which is the center of the eccentric hole 9d of the operation rod 9, but the axis O ₂ of the drive shaft 17 is the axis O _{2.
Since the} eccentricity is from ₁ to e ₂ , the axis O ₂ is the axis O ₁
Will be revolved around the outer circumference. Therefore, FIG.
Of, as shown in (a), polishing the axial center O ₂ and the axial center O ₁ point 2
The whetstone 21 can be pressed against the polishing portion 2b by adjusting the position so that it is located between the polishing point 2b and the point b. In addition,
This adjustment can also be easily performed, for example, by providing the handle insertion hole 12c at the position where the lower eccentric ring 12 has the thickest wall thickness.

【００１６】上述した如く、砥石２１の位置を設定した
後、駆動軸１７の下端部に駆動装置を連結して駆動軸１
７を駆動すると、駆動軸１７は上下のスラスト軸受１８
で支承されながら軸芯Ｏ₂ を中心に回転させられるた
め、砥石２１によって管２の内面の部分的な研磨個所２
ｂだけを研磨することができる。As described above, after the position of the grindstone 21 is set, the drive device is connected to the lower end of the drive shaft 17 to connect the drive shaft 1 to the drive shaft 1.
7 drives the drive shaft 17 to move the upper and lower thrust bearings 18
Since it can be rotated around the axis O ₂ while being supported by, the grinding wheel 21 partially polishes the inner surface of the pipe 2 at a part 2
Only b can be polished.

【００１７】一方、管２の内面を周方向に均等に研磨す
る場合には、上記部分的な研磨作業と同状態において、
ハンドル１０の操作で操作ロッド９を回転させるように
する。これにより、駆動軸１７は軸芯Ｏの外周を自転し
ながら公転させられることになり、砥石２１が管２の内
周面に沿い転動させられる如く移動させられる結果、管
２の内面が周方向に均等に研磨される。On the other hand, when the inner surface of the tube 2 is evenly polished in the circumferential direction, in the same state as the above partial polishing work,
The operation rod 9 is rotated by operating the handle 10. As a result, the drive shaft 17 is revolved around the outer periphery of the axis O while rotating, and the grindstone 21 is moved along the inner peripheral surface of the tube 2 so that the inner peripheral surface of the tube 2 is rotated. Direction is evenly ground.

【００１８】なお、本発明は上記実施例のみに限定され
るものではなく、偏芯量ｅ₁ ，ｅ₂の値を適宜選定する
ことにより砥石２１の押付力を任意に設定できること、
その他本発明の要旨を逸脱しない範囲内において種々変
更を加え得ることは勿論である。The present invention is not limited to the above embodiment, but the pressing force of the grindstone 21 can be arbitrarily set by appropriately selecting the values of the eccentricity amounts e ₁ and e ₂ .
Needless to say, various changes can be made without departing from the scope of the present invention.

【００１９】[0019]

【発明の効果】以上述べた如く、本発明の管内面研磨機
によれば、基管の軸芯から順次ずれた第１偏芯軸芯と第
２偏芯軸芯を設定し、基管の軸芯に沿わせて操作ロッド
を昇降させることにより第２偏芯軸芯上の駆動軸を介し
て研磨具の高さ位置調整を行うことができ、且つ第１偏
芯軸芯を中心として駆動軸を公転操作することで研磨具
の平面位置調整を行うことができるようにしたので、研
磨具を管内面の一部に押し付けて部分研磨作業を行わせ
ることができ、更に、部分研磨作業状態において駆動軸
を公転させることにより管内面を周方向に均等に研磨す
ることができる、という優れた効果を発揮する。As described above, according to the pipe inner surface polishing machine of the present invention, the first eccentric shaft center and the second eccentric shaft center which are sequentially displaced from the shaft center of the base pipe are set, and By moving the operating rod up and down along the axis, the height position of the polishing tool can be adjusted via the drive shaft on the second eccentric axis, and the polishing tool is driven about the first eccentric axis. Since the plane position of the polishing tool can be adjusted by revolving the shaft, the polishing tool can be pressed against a part of the inner surface of the pipe to perform partial polishing work. By rotating the drive shaft, the inner surface of the tube can be evenly polished in the circumferential direction, which is an excellent effect.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の管内面研磨機の一実施例を示す切断側
面図である。FIG. 1 is a cut side view showing an embodiment of a pipe inner surface polishing machine of the present invention.

【図２】図１のＩＩ−ＩＩ方向から見た状態を模式的に
示すもので、（イ）は砥石を管内面に当接させた状態
を、又、（ロ）は砥石を管内面に当接させないように位
置させた状態を示す図である。FIG. 2 schematically shows a state as viewed from the direction II-II in FIG. 1, where (a) shows a state in which the grindstone is in contact with the pipe inner surface, and (b) shows the grindstone on the pipe inner surface. It is a figure which shows the state which has been positioned so that it may not contact.

【図３】原子炉圧力容器の概略図である。FIG. 3 is a schematic diagram of a reactor pressure vessel.

【図４】従来用いられていた研磨具の例を示すもので、
（イ）はフラップホイールの概要図、（ロ）はフレック
スホーンの概要図である。FIG. 4 shows an example of a conventional polishing tool,
(A) is a schematic view of a flap wheel, and (B) is a schematic view of a flexhorn.

【符号の説明】[Explanation of symbols]

Ｏ 軸芯 Ｏ₁ 軸芯（第１偏芯軸芯） Ｏ₂ 軸芯（第２偏芯軸芯） ８ 基管 ９ 操作ロッド ９ｄ 偏芯孔部 １１ 上部偏芯リング １２ 下部偏芯リング １３ 継手管 １４ ガイド管 １７ 駆動軸 ２１ 砥石（研磨具）O axis center O ₁ axis center (first eccentric axis center) O ₂ axis center (second eccentric axis center) 8 base tube 9 operating rod 9d eccentric hole 11 upper eccentric ring 12 lower eccentric ring 13 joint Tube 14 Guide tube 17 Drive shaft 21 Grindstone (polishing tool)

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 上下方向に延びる基管内に、該基管の軸
芯からずれた第１偏芯軸芯を中心とする偏芯孔部を有す
る操作ロッドを昇降可能に挿入し、該操作ロッドの偏芯
孔部の下端部に、上記第１偏芯軸芯からずれた第２偏芯
軸芯を有する下部偏芯リングを回転可能に支持させ、該
下部偏芯リングと上方の所要高さ位置に対向させて配置
した上部偏芯リングとを、上記第１偏芯軸芯を中心とす
る継手管にて連結し、且つ該継手管の外周部に、上端部
にて上記上部偏芯リングの外周面部を回転自在に支持す
ると共に下端部を上記操作ロッドの上端部に固定したガ
イド管を、上記基管の軸芯を中心として設け、更に、上
下の偏芯リング間に、上記第２偏芯軸芯を中心に回転駆
動可能とした駆動軸を上下方向の位置を定めて貫通配置
し、該駆動軸の上端部に研磨具を取り付けた構成を有す
ることを特徴とする管内面研磨機。1. An operation rod having an eccentric hole centered on a first eccentric shaft center deviated from the shaft center of the base pipe is inserted into a vertically extending base pipe so as to be able to move up and down. A lower eccentric ring having a second eccentric shaft center deviated from the first eccentric shaft center is rotatably supported at the lower end of the eccentric hole part of the eccentric hole part, and the lower eccentric ring and the required height above And an upper eccentric ring arranged so as to face each other at a position by a joint pipe having the first eccentric shaft center as a center, and the upper eccentric ring at an upper end portion at an outer peripheral portion of the joint pipe. A guide tube, which rotatably supports the outer peripheral surface of the base tube and whose lower end is fixed to the upper end of the operation rod, is provided centering on the axial center of the base tube, and further, between the upper and lower eccentric rings. An eccentric shaft A drive shaft that can be driven to rotate around an eccentric shaft is pierced at a vertically determined position, and the upper end of the drive shaft A pipe inner surface polishing machine having a structure in which a polishing tool is attached to the portion.