JP2013180365A - Negative-pressure suction blast method of pipe inner surface and device - Google Patents
Negative-pressure suction blast method of pipe inner surface and device Download PDFInfo
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- JP2013180365A JP2013180365A JP2012045645A JP2012045645A JP2013180365A JP 2013180365 A JP2013180365 A JP 2013180365A JP 2012045645 A JP2012045645 A JP 2012045645A JP 2012045645 A JP2012045645 A JP 2012045645A JP 2013180365 A JP2013180365 A JP 2013180365A
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Abstract
Description
本発明は、管内面の負圧吸引ブラスト方法及び装置に関する。 The present invention relates to a negative pressure suction blasting method and apparatus for an inner surface of a pipe.
従来、図2に示す様に、被処理管10の一端側に開放端側を接続されて水平に延びた円筒状体1の閉鎖端側に縦偏心型(縦型であって該縦型の軸心が円筒状体の軸心を外れるものを意味する。以下同じ)の吸気道2を設けて空気供給部4となし、被処理管10の他端側から管内空気吸引7を行い、吸気道2から下方に向かう負圧吸引空気流6中へ、研掃材ホッパ8から、前記円筒状体1の軸心Cからずれた方向に研掃材5を落下させるという、管内面の負圧吸引ブラスト方法が知られている(特許文献1参照)。
Conventionally, as shown in FIG. 2, a vertical eccentric type (vertical type and vertical type) is provided on the closed end side of a
これによれば、被処理管内の空気及び研掃材の流れを乱流状態とする事ができ、被処理管の内面全体を迅速かつ均一にブラスト処理する事が可能であるとされている。 According to this, it is said that the flow of the air and the cleaning material in the pipe to be processed can be made into a turbulent state, and the entire inner surface of the pipe to be processed can be blasted quickly and uniformly.
然しながら、前記従来技術では、図2に示す如く、空気供給部4において、吸気道下方の円筒状体底部30及び円筒状体閉鎖端部31並びに吸気道下部の邪魔板部32といった近吸気道部は、吸気道2から下方に向かう負圧吸引空気流6に巻き込まれて下向きに強く付勢された研掃材(例えばアルミナ粒子)5からの衝突衝撃力をまともに受けて、損耗の進行度合いが大きく、数日程度の短期間で穴が開き、その都度修繕を余儀なくされるという課題があった。
However, in the prior art, as shown in FIG. 2, in the
前記課題を解決する為になされた本発明は以下の通りである。
(1)被処理管の一端側に開放端側を接続されて水平に延びた円筒状体の閉鎖端側に縦偏心型の吸気道を設けて空気供給部となし、被処理管の他端側から管内空気吸引を行い、吸気道から下方に吸引された後、被処理管内に向かって円筒状体内を流れつつある負圧吸引空気流中へ、円筒状体内と直結させた縦偏心型の研掃材ホッパ内から、円筒状体の軸心からずれた方向に研掃材を落下させることを特徴とする管内面の負圧吸引ブラスト方法。
(2)被処理管の一端側に開放端側を接続されて水平に延びた円筒状体と、該円筒状体の閉鎖端側に設けられた縦偏心型の吸気道と、該吸気道から被処理管までの間の円筒状体内と直結された縦偏心型の研掃材ホッパとを具備した空気供給部と、被処理管の他端側に接続されて管内空気吸引を行う管内空気吸引部とを有することを特徴とする管内面の負圧吸引ブラスト装置。
The present invention made to solve the above problems is as follows.
(1) A longitudinally eccentric intake passage is provided on the closed end side of a cylindrical body which is connected to one end side of the pipe to be processed and extends horizontally, and serves as an air supply unit. The other end of the pipe to be processed A vertical eccentric type that is directly connected to the cylindrical body, into the negative pressure suction air flow that is flowing through the cylindrical body toward the inside of the pipe after being sucked down from the intake passage and sucked downward from the intake passage. A negative pressure suction blasting method for an inner surface of a tube, wherein the abrasive is dropped from the inside of the abrasive hopper in a direction deviated from the axis of the cylindrical body.
(2) A cylindrical body that is connected to one end side of the pipe to be processed and has an open end side that extends horizontally, a longitudinally eccentric intake passage that is provided on the closed end side of the cylindrical body, An air supply unit having a longitudinal eccentric type scouring material hopper directly connected to the cylindrical body between the pipes to be treated and an air suction inside the pipes connected to the other end of the pipe to be sucked. A negative pressure suction blasting device for the inner surface of the tube.
本発明によれば、空気供給部の長寿命化が達成できて、設備修繕費を削減できると共に、管内面の負圧吸引ブラスト処理の生産性が向上する。 According to the present invention, it is possible to extend the life of the air supply unit, reduce equipment repair costs, and improve the productivity of the negative pressure suction blasting process on the inner surface of the pipe.
図1は、本発明の1例を示す概略図であり、(a)は空気供給部9の縦断面図、(b)は近吸気道部の横断面図、(c)は近研掃材ホッパ部の横断面図である。
図1に示される様に、本発明に係る管内面の負圧吸引ブラスト方法は、被処理管10の一端側に開放端側を接続されて水平に延びた円筒状体1の閉鎖端側に縦偏心型の吸気道2を設けて空気供給部9となし、被処理管10の他端側から管内空気吸引7を行い、吸気道2から下方に吸引された後、被処理管10内に向かって円筒状体1内を流れつつある負圧吸引空気流6中へ、円筒状体1内と直結させた縦偏心型の研掃材ホッパ8内から、円筒状体1の軸心Cからずれた方向に研掃材5を落下させるというものである。
1A and 1B are schematic views showing an example of the present invention, in which FIG. 1A is a longitudinal sectional view of an air supply unit 9, FIG. 1B is a transverse sectional view of a near intake passage portion, and FIG. It is a cross-sectional view of a hopper part.
As shown in FIG. 1, the negative pressure suction blasting method for the inner surface of a pipe according to the present invention is performed on the closed end side of a
空気供給部9は、被処理管10の一端側に開放端側を接続されて水平に延びた円筒状体1と、該円筒状体1の閉鎖端側に設けられた縦偏心型の吸気道2と、該吸気道2から被処理管10までの間の円筒状体1内と直結された縦偏心型の研掃材ホッパ8とを具備している。
空気供給部9において、吸気道2(の下流側端)から円筒状体1の開放端(被処理管10との接続端)までの長さL1は、必要且つ十分な螺旋状乱流化助走距離を稼ぐ為に、被処理管10の内径サイズによりL1=500mm〜3000mm程度とすると良い。研掃材ホッパ8を円筒状体1内と直結させる位置は、吸気道2から下流側に距離L(L≦L1)の位置とされている。
The air supply unit 9 includes a
In the air supply section 9, the length L1 from the intake passage 2 (the downstream end thereof) to the open end of the cylindrical body 1 (the connection end with the pipe to be processed 10) is a necessary and sufficient spiral turbulent run. In order to increase the distance, it is preferable that L1 = about 500 mm to about 3000 mm depending on the inner diameter size of the tube to be processed 10. The position where the
被処理管10の他端側には、管内空気吸引7を行う管内空気吸引部(図示省略)が接続されている。該管内空気吸引部は、排風機、サイクロン式集塵機、研掃材回収タンク等を組み合わせた構成とされ、該構成は従来と同様である(例えば、特許文献1[0084]〜[0092]参照)。
本発明に係る管内面の負圧吸引ブラスト装置は前記空気供給部9及び前記管内空気吸引部を有するものである。
An in-tube air suction portion (not shown) for performing in-
The negative pressure suction blasting device for the pipe inner surface according to the present invention has the air supply part 9 and the pipe air suction part.
縦偏心型の研掃材ホッパ8を吸気道2から下流側に距離Lだけ離れた位置で円筒状体1内と直結させた事により、研掃材5は、吸気道2付近の下降流が主体となっている負圧吸引空気流6には巻き込まれず、吸気道2から下流側に発達する螺旋状乱流が主体となった負圧吸引空気流6に乗って円筒状体1内を流れる。従って、研掃材5が近吸気道部の円筒状体内面と激しく衝突して該衝突箇所を損耗させるという事は無くなる。
Since the longitudinally eccentric type
吸気道2から下流側の円筒状体1内への研掃材ホッパ8の直結位置までの距離Lに関しては、距離Lが短すぎると落下した研掃材5は、吸気道2からの下降気流が円筒状体1底部乃至側部を経由した1次回り込み気流(未だ勢力は強い)に巻き込まれて吸気道2下部の邪魔板部32に強く衝突し、これを損耗させ易くなる。一方、距離Lが長すぎると落下した研掃材5が未だ螺旋状乱流に十分乗りきらないうちに被処理管10内に届いてしまい、被処理管10の空気流入側端部内面に対するブラスト処理が不均一な仕上がりとなり易い。これらの点を考慮して距離Lの好適範囲を実験で調査した結果によると、距離L=200mm〜(L1−200)mmとするのが好ましい。
Regarding the distance L from the
外径φ2-3/8〜16inch(φ60.3〜φ406.4mm)の継目無鋼管の管内面の負圧吸引ブラスト工程において図1の形態の本発明例を実施し、従来例(図2の形態)と比較した。研掃材はアルミナ粒子(粒径1〜3mm程度)を使用した。その結果、本発明例の空気供給部9の耐用寿命は、従来例の空気供給部4のそれと比べて約10倍に延び、設備修繕費の大幅な削減並びに前記ブラスト工程の生産性の大幅な向上が達成された。
In the negative pressure suction blasting process of the inner surface of a seamless steel pipe having an outer diameter of φ2-3 / 8 to 16 inch (φ60.3 to φ406.4 mm), the embodiment of the present invention in the form of FIG. Form). As the polishing material, alumina particles (particle size of about 1 to 3 mm) were used. As a result, the useful life of the air supply unit 9 of the present invention is about 10 times longer than that of the
1 円筒状体
2 吸気道
4 空気供給部(従来)
5 研掃材(例えばアルミナ粒子)
6 負圧吸引空気流
7 管内空気吸引
8 研掃材ホッパ
9 空気供給部(本発明)
10 被処理管
30 吸気道下方の円筒状体底部
31 吸気道下方の円筒状体閉鎖端部
32 吸気道下部の邪魔板部
DESCRIPTION OF
5 Abrasives (eg alumina particles)
6 Negative pressure
DESCRIPTION OF
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016092975A1 (en) * | 2014-12-08 | 2016-06-16 | 新東工業株式会社 | Burr removal device and burr removal method |
WO2016092976A1 (en) * | 2014-12-08 | 2016-06-16 | 新東工業株式会社 | Polishing device and polishing method |
JP2018089748A (en) * | 2016-12-06 | 2018-06-14 | 三共理化学株式会社 | Blasting method and device for internal surface of tube |
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US3914815A (en) * | 1974-09-20 | 1975-10-28 | Fuji Seiki Machine Works | Pipe inside cleaning device |
JPH05228842A (en) * | 1992-02-21 | 1993-09-07 | Takashi Sato | Method and device for negative pressure suction-blasting of pipe inner surface |
JPH0890418A (en) * | 1994-09-22 | 1996-04-09 | Kawasaki Steel Corp | Pipe interior blasting device |
JP2008055572A (en) * | 2006-09-01 | 2008-03-13 | Sumitomo Metal Ind Ltd | Steel pipe inner face blast device, steel pipe inner face blast method, and method for manufacturing steel pipe with excellent inner surface property |
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Patent Citations (4)
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US3914815A (en) * | 1974-09-20 | 1975-10-28 | Fuji Seiki Machine Works | Pipe inside cleaning device |
JPH05228842A (en) * | 1992-02-21 | 1993-09-07 | Takashi Sato | Method and device for negative pressure suction-blasting of pipe inner surface |
JPH0890418A (en) * | 1994-09-22 | 1996-04-09 | Kawasaki Steel Corp | Pipe interior blasting device |
JP2008055572A (en) * | 2006-09-01 | 2008-03-13 | Sumitomo Metal Ind Ltd | Steel pipe inner face blast device, steel pipe inner face blast method, and method for manufacturing steel pipe with excellent inner surface property |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016092975A1 (en) * | 2014-12-08 | 2016-06-16 | 新東工業株式会社 | Burr removal device and burr removal method |
WO2016092976A1 (en) * | 2014-12-08 | 2016-06-16 | 新東工業株式会社 | Polishing device and polishing method |
JPWO2016092975A1 (en) * | 2014-12-08 | 2017-09-14 | 新東工業株式会社 | Deburring device and deburring method |
JPWO2016092976A1 (en) * | 2014-12-08 | 2017-09-14 | 新東工業株式会社 | Polishing apparatus and polishing method |
EP3202534A4 (en) * | 2014-12-08 | 2018-05-23 | Sintokogio, Ltd. | Polishing device and polishing method |
US10384328B2 (en) | 2014-12-08 | 2019-08-20 | Sintokogio, Ltd. | Polishing device and polishing method |
JP2018089748A (en) * | 2016-12-06 | 2018-06-14 | 三共理化学株式会社 | Blasting method and device for internal surface of tube |
JP7007087B2 (en) | 2016-12-06 | 2022-01-24 | 三共理化学株式会社 | Blasting method and equipment for the inner surface of the pipe |
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