JPS6347123A - Method for covering spiral steel pipe with resin sheet - Google Patents

Method for covering spiral steel pipe with resin sheet

Info

Publication number
JPS6347123A
JPS6347123A JP19168086A JP19168086A JPS6347123A JP S6347123 A JPS6347123 A JP S6347123A JP 19168086 A JP19168086 A JP 19168086A JP 19168086 A JP19168086 A JP 19168086A JP S6347123 A JPS6347123 A JP S6347123A
Authority
JP
Japan
Prior art keywords
bead
resin sheet
weld bead
detector
sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP19168086A
Other languages
Japanese (ja)
Other versions
JPH0733067B2 (en
Inventor
Kazuhiko Miura
美浦　一彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP19168086A priority Critical patent/JPH0733067B2/en
Publication of JPS6347123A publication Critical patent/JPS6347123A/en
Publication of JPH0733067B2 publication Critical patent/JPH0733067B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
    • B29C63/04—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
    • B29C63/048—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like specially adapted for articles having local protrusions, e.g. tubes having a bead weld

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To make the thickness of a covering resin sheet thicker only at its necessary portion by a method wherein the wrapping speed of the sheet is made slower during the period that the resin sheet covers a weld bead by detecting the instant to start to cover the weld bead and that to end to cover the weld bead with two weld bead detectors. CONSTITUTION:Bead detectors 1 and 2 are installed at an interval nearly the same as the width of a resin sheet 3 to wrap with. The resin sheet 3 is extruded from the T-die 4 of an extruder, which extrudes resin in the form of a molten sheet. When a pipe is rotated askew, the weld bead 6 is firstly detected with the bead detector 1. The time, that the bead part 6 detected by the bead detector 1 actually reaches the position to be wrapped with the resin sheet is after TA since the detection of the bead part 6 and set by the control device 8 of a bead detection signal and a control device 9 of a skew roll is set to bring the skew rotation to the predetermined slow speed at that time [at the point (a) in the figure]. Next, the weld bead 6 is detected with the bead detector 2. Further, the control devices 8 and 9 are set to bring the skew rotation to restore its original wrapping speed after the time TB, that the weld bead part detected by the bead detector 2 reaches the position to be wrapped with the resin sheet.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 この発明は、スパイラル鋼管のＴダイ方式による樹脂シ
ートを被覆する方法、特にスパイラル鋼管にＴダイ方式
により樹脂シートを被覆するときに溶接ビードによる凸
部があっても樹脂シート膜厚が一定になるようにしたス
パイラル鋼管の樹脂シート被覆方法に関するものである
。[Detailed Description of the Invention] <Industrial Application Field> This invention relates to a method of coating a spiral steel pipe with a resin sheet using the T-die method, and particularly a method of coating a spiral steel pipe with a resin sheet using the T-die method using a weld bead. The present invention relates to a method of coating a spiral steel pipe with a resin sheet so that the thickness of the resin sheet remains constant even if there are convex portions.

〈従来の技術〉 鋼管表面に部分的な凸部があると、この凸部の個所で樹
脂シート被覆の膜厚が薄くなる。このため、従来、１個
のビード検出器を用いビードを検出して、ビード部を被
覆する瞬間、樹脂シートを巻付ける速度を遅＜シ、シー
ト厚みを厚くして膜厚を確保するという方法が用いられ
ている。<Prior Art> When a steel pipe surface has a partial protrusion, the thickness of the resin sheet coating becomes thinner at the location of the protrusion. For this reason, the conventional method is to detect the bead using a single bead detector, and at the moment the bead is covered, the speed at which the resin sheet is wound is slowed down and the sheet thickness is increased to ensure the film thickness. is used.

（例：特開昭５７−１３３０２７゜） この方法は、ストレートシーム鋼管のようにビード部全
体が同一タイミングで巻かれる場合には有効な方法であ
るが、スパイラル鋼管のようにビード部が斜めに一定時
間を要して通過するような場合には適切な方法でない。(Example: JP-A-57-133027゜) This method is effective when the entire bead part is wound at the same timing, such as in a straight seam steel pipe, but when the bead part is wound diagonally, as in a spiral steel pipe. This is not an appropriate method if it takes a certain amount of time to pass.

すなわち、この方法を強いてスパイラル鋼管に適用する
ためには、ビード検出器にタイマーを組合せて、一定時
間低速度で巻付は続けるようにすることが考えられる。That is, in order to forcefully apply this method to spiral steel pipes, it is conceivable to combine a bead detector with a timer so that the winding continues at a low speed for a certain period of time.

しかし、この方法では、シートの巻付幅１巻付速度、ビ
ードの傾斜角度など種々の条件を考慮して低速巻付の持
続時間を設定する必要があり、極めて煩雑である。However, this method is extremely complicated because it is necessary to set the duration of low-speed winding in consideration of various conditions such as the winding speed per winding width of the sheet and the inclination angle of the bead.

〈発明が解決しようとする問題点〉 この発明は、スパイラル鋼管のビード部の樹脂シート厚
みを厚く巻付けるための低速巻付の持続時間を種々の条
件によって設定し直さなければならない煩雑さを全くな
りシ９条件の変更があっても、自動的に持続時間も変更
されるようなスパイラル鋼管の樹脂シート被覆方法を提
供するためになされたものである。<Problems to be Solved by the Invention> This invention completely eliminates the trouble of having to reset the duration of low-speed winding to increase the thickness of the resin sheet at the bead portion of a spiral steel pipe depending on various conditions. This invention has been made in order to provide a method of coating a spiral steel pipe with a resin sheet in which the duration is automatically changed even if the conditions are changed.

〈問題点を解決するための手段〉 発明者は、スパイラル鋼管の樹脂シート被覆方法につい
て鋭意研究を重ねた結果、２個の溶接ビード検出器を用
いることによって溶接ビード部の凸部にもシート膜厚を
一定に、被覆できるとの知見をえ、この知見にもとづい
てこの発明をなすに至った。<Means for Solving the Problems> As a result of extensive research into the method of coating spiral steel pipes with resin sheets, the inventor discovered that by using two weld bead detectors, a sheet film can be applied to the convex portions of weld beads. It was discovered that the coating can be coated with a constant thickness, and based on this knowledge, the present invention was made.

この発明は、スパイラル鋼管のＴダイ方式による樹脂シ
ート被覆において、２個の溶接ビード検出器を樹脂シー
トの巻付幅と同一間隙で取付け。In this invention, two weld bead detectors are installed with the same gap as the winding width of the resin sheet when coating a spiral steel pipe with a resin sheet using the T-die method.

最初の検出器がビードを検出した信号によってシート巻
付速度を低速にし１次の検出器が検出した信号によって
正規の巻付速度に復帰することを繰返すことによって、
スパイラル鋼管のビード部の樹脂シート厚みを確保する
樹脂シート被覆方法である。By repeating the process of slowing down the sheet winding speed based on the signal detected by the first detector and returning to the normal winding speed based on the signal detected by the primary detector,
This is a resin sheet coating method that ensures the thickness of the resin sheet at the bead portion of a spiral steel pipe.

〈作　用〉 この発明の方法は、２個の溶接ビード検出器を樹脂シー
ト巻付幅と同間隔に設置することによって、溶接ビード
部が被覆され始める瞬間と被覆が終了する瞬間とを自動
的に検出し、溶接ビード部を樹脂シートで被覆する間、
シート巻付速度を低速度にして、シート厚みを厚くする
方法である。<Operation> The method of the present invention automatically detects the moment when the weld bead begins to be covered and the moment when the coating ends by installing two weld bead detectors at the same interval as the resin sheet wrapping width. while the weld bead is covered with a resin sheet.
This method lowers the sheet winding speed and increases the sheet thickness.

〈実施例〉 この発明を第１図および第２図にしたがって説明する。<Example> This invention will be explained with reference to FIGS. 1 and 2.

第１図はスパイラル鋼管のＴダイ方式による樹脂シート
被覆状況およびこの発明を説明する斜視図である。FIG. 1 is a perspective view illustrating the state of coating a spiral steel pipe with a resin sheet using the T-die method and the present invention.

ビード検出器１および２は巻付けている樹脂シート（例
溶融ポリエチレン）３の幅とほぼ同一の間隙で設置され
ている。The bead detectors 1 and 2 are installed with a gap that is approximately the same as the width of the resin sheet (eg, molten polyethylene) 3 wrapped around it.

樹脂シート３は溶融シートとして押出す押出機のＴダイ
４から押出される。溶接ビード６をスパイラルにもった
スパイラル鋼管６はスキュー回転用ロール７によってス
キュー回転される。The resin sheet 3 is extruded as a molten sheet from a T-die 4 of an extruder. A spiral steel pipe 6 having a spiral weld bead 6 is skew-rotated by a skew-rotation roll 7.

第２図は、樹脂シート被覆の状態を示す断面図およびそ
の制御方法を示す説明図である。FIG. 2 is a cross-sectional view showing the state of resin sheet coating and an explanatory view showing a control method thereof.

ビード検出信号制御装置８は、ビード検出器がビードを
検出してから巻付速度を低速にするまでの時間的ずれを
生じさせたり、スパイラル鋼管の溶接部が逆方向の場合
それぞれの検出器の信号を逆にして利用するための制御
装置であり、スキューロール制御装置９は、その制御装
置の信号でスキューロールの回転を変化させるスキュー
ロールの制御装置である。The bead detection signal control device 8 causes a time lag between when the bead detector detects a bead and when the winding speed is reduced to a low speed, or when the welding part of the spiral steel pipe is in the opposite direction, The skew roll control device 9 is a control device for reversing and using signals, and the skew roll control device 9 is a skew roll control device that changes the rotation of the skew roll using signals from the control device.

この発明の原理を第３図及び第４図にしたがって説明す
る。The principle of this invention will be explained with reference to FIGS. 3 and 4.

パイプがスキュー回転していくと、ビード検出器１によ
って溶接ビード６がまず検出される。実際にそのビード
部が樹脂シートの巻付位置に到達するのはＴＡ経った後
であり、これを制御装置８にて設定し、その時スキュー
回転が所定の低速度になるように（図中ａ点）制御装置
９を設定する。As the pipe rotates skewly, the weld bead 6 is first detected by the bead detector 1. The bead actually reaches the resin sheet wrapping position after TA, and this is set by the control device 8 so that the skew rotation is at a predetermined low speed (a in the figure). Point) Set the control device 9.

次に、ビード検出器２によって溶接ビード６が検出され
る。そしてこの溶接ビード部が巻付位置に到着するＴＩ
ｌ経った後にスキュー回転が本来の巻付速度に復帰する
よう制御装置８．９を設定する。Next, weld bead 6 is detected by bead detector 2 . TI where this weld bead reaches the winding position
The control device 8.9 is set so that the skew rotation returns to the original winding speed after l has elapsed.

このようにすることによって被覆された樹脂シートは、
第４図に示すように点ａからシート厚みが増加し点すま
でそれを持続した後本来の厚みに復帰するような被覆と
なり、その内に溶接部を包込むことができる。The resin sheet coated in this way is
As shown in FIG. 4, the sheet thickness increases from point a, maintains this state until point a, and then returns to its original thickness, making it possible to enclose the welded portion within it.

〈発明の効果〉 従来の１個の溶接ビード検出器とタイマーを用いて、ス
パイラル鋼管の樹脂被覆でビード部の被覆膜厚を厚くし
ようとすれば、溶接ビードの傾斜度９巻付幅９巻付速度
等を考慮して低速度で巻付ける時間を複雑に調整する必
要があった。<Effects of the Invention> When trying to increase the thickness of the bead portion of a spiral steel pipe with a resin coating using a single conventional weld bead detector and timer, it is possible to increase the thickness of the weld bead with a resin coating of 9 turns and a width of 9 turns. It was necessary to make complicated adjustments to the winding time at low speed, taking into consideration the winding speed, etc.

この発明の方法を用いれば、溶接ビードの傾斜度９巻付
速度等に関係なく、溶接ビード検出器がビードを検出し
てから実際に低速度に変更するまでの時間をタイマーで
設定するのみで、極めて簡単に必要な部分のみの樹脂シ
ート被覆膜を厚くすることができる。If the method of this invention is used, regardless of the inclination of the weld bead, 9 winding speed, etc., all you need to do is set the time from when the weld bead detector detects the bead to when the speed is actually changed to a low speed using a timer. , it is possible to extremely easily increase the thickness of the resin sheet coating only in the necessary portions.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、この発明に係るスパイラル網管の樹脂シート
被覆方法を示す斜視図、第２図は、第１図のＡＡ断面図
と樹脂シート厚み制御方法を示す説明図、第３図および
第４図は、この発明の詳細な説明図である。 ■・・・ビード検出器 ２・・・同　上 ３・・・溶融樹脂シート ４・・・樹脂シート押出機（Ｔダイ） ５・・・スパイラル鋼管 ６・・・溶接ビード ７・・・スキュー回転用ロールFIG. 1 is a perspective view showing a resin sheet coating method for a spiral net pipe according to the present invention, FIG. 2 is an AA sectional view of FIG. 1 and an explanatory diagram showing a resin sheet thickness control method, and FIGS. The figure is a detailed explanatory diagram of the invention. ■... Bead detector 2... Same as above 3... Molten resin sheet 4... Resin sheet extruder (T die) 5... Spiral steel pipe 6... Weld bead 7... Skew rotation roll for

Claims (1)

【特許請求の範囲】[Claims] スパイラル鋼管のＴダイ方式による樹脂シート被覆にお
いて、２個の溶接ビード検出器を樹脂シートの巻付幅と
同一間隔で取付け、最初の検出器がビードを検出した信
号によってシート巻付速度を低速にし、次の検出器が検
出した信号によって正規の巻付速度に復帰することを繰
返すことによって、スパイラル鋼管のビード部の樹脂シ
ート厚みを確保することを特徴とする樹脂シート被覆方
法。When coating a spiral steel pipe with a resin sheet using the T-die method, two weld bead detectors are installed at the same interval as the wrapping width of the resin sheet, and the sheet wrapping speed is slowed down based on the signal that the first detector detects a bead. A resin sheet coating method characterized in that the thickness of the resin sheet at the bead portion of a spiral steel pipe is ensured by repeating the process of returning to the normal wrapping speed in response to a signal detected by the next detector.
JP19168086A 1986-08-18 1986-08-18 Spiral steel pipe resin sheet coating method Expired - Lifetime JPH0733067B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19168086A JPH0733067B2 (en) 1986-08-18 1986-08-18 Spiral steel pipe resin sheet coating method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19168086A JPH0733067B2 (en) 1986-08-18 1986-08-18 Spiral steel pipe resin sheet coating method

Publications (2)

Publication Number Publication Date
JPS6347123A true JPS6347123A (en) 1988-02-27
JPH0733067B2 JPH0733067B2 (en) 1995-04-12

Family

ID=16278670

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19168086A Expired - Lifetime JPH0733067B2 (en) 1986-08-18 1986-08-18 Spiral steel pipe resin sheet coating method

Country Status (1)

Country Link
JP (1) JPH0733067B2 (en)

Also Published As

Publication number Publication date
JPH0733067B2 (en) 1995-04-12

Similar Documents

Publication Publication Date Title
JPS6347123A (en) Method for covering spiral steel pipe with resin sheet
JP2631034B2 (en) Roll packaging method and device
JP3275573B2 (en) Metal strip winding control method
JPS57133027A (en) Control of film thickness of coated steel pipe
JPS57133026A (en) Polyethylene coating of welded steel pipe
JPS60228129A (en) Film thickness controlling method of coated steel pipe
JP2944381B2 (en) Strip shear condition detector
JPH01299172A (en) Tape guide to tape winder to long-sized object
JPH11319941A (en) Coiling method of down coiler, and coiling control device
JPH1053375A (en) Wire winding method
JPH01123724A (en) Polyolefin covering device of negative frictional force reducing steel pipe pile having uniformly thick covering layer
JPS61273214A (en) Automatic plate turning control method for thick plate rolling mill
JPH04266355A (en) Winder controller
JPH09122751A (en) Strip coiling control device of down coiler
JPH08259067A (en) Web sliding method and its device
JPH07164046A (en) Method for controlling take-up position of take-up reel in axial direction
ES8100628A1 (en) Controlled coating of welded tube seams with polyethylene - using optical or contacting device to retard seam approach speed
JPS6141732Y2 (en)
JPS622535Y2 (en)
JPS6224907A (en) Control device for cutting side edge of roller material
JP2885388B2 (en) Centering method for joining strips
JPS60148626A (en) Plate elongation preventing and controlling method by winder of rolling device
JPS5675827A (en) Coating metal pipe with plastics
JPH0198545A (en) Paper connecting position detecting device
JPH03279150A (en) Long material winder control method and device