JP2020132941A - Method of manufacturing galvanized steel pipe and hot-galvanizing device for steel pipe - Google Patents

Method of manufacturing galvanized steel pipe and hot-galvanizing device for steel pipe Download PDF

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JP2020132941A
JP2020132941A JP2019027578A JP2019027578A JP2020132941A JP 2020132941 A JP2020132941 A JP 2020132941A JP 2019027578 A JP2019027578 A JP 2019027578A JP 2019027578 A JP2019027578 A JP 2019027578A JP 2020132941 A JP2020132941 A JP 2020132941A
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steel pipe
hot
screw
galvanized
bath
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JP6973428B2 (en
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佐々木 成人
Shigeto Sasaki
成人 佐々木
貴臣 加藤
Takaomi Kato
貴臣 加藤
絹正 小野
Kinumasa Ono
絹正 小野
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JFE Steel Corp
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Abstract

To provide a method of manufacturing a galvanized steel pipe applied to piping uses, and a hot-galvanizing device.SOLUTION: As a method of manufacturing a galvanized steel pipe that comprises dipping a steel pipe in a hot-galvanizing bath for a constant time and then lifting it from the galvanizing bath thereafter, there is provided a manufacturing method for galvanized steel pipe characterized in dispensing the steel pipe to a lifting device by a dispensing device installed at a spiral surface end part of a rotary shaft. A hot-galvanizing device for steel pipe consists of a plating tank which constitutes the hot-galvanizing bath: a screw which lowers and conveys the steel pipe into the hot-galvanizing bath for dipping, and has a spiral surface on the rotary shaft; a cradle which temporarily receives the steep pipe having passed the spiral surface end part of the screw; the dispensing device for steel pipe which is provided at the spiral surface end part of the rotary shaft; and a lifting device which lifts the steel pipe on the cradle dispensed by the dispensing device.SELECTED DRAWING: Figure 2

Description

本発明は、水、ガス、油等の配管用途に適用される亜鉛めっき鋼管の製造方法およびその装置に係り、より詳しくは鋼管を溶融亜鉛めっき浴中に浸漬し引き揚げて鋼管の内外面に亜鉛めっきを施す方法および装置に関する。 The present invention relates to a method for manufacturing a galvanized steel pipe applied to piping applications such as water, gas, and oil, and an apparatus therefor. Regarding the method and equipment for galvanizing.

亜鉛めっき鋼管は、前処理(脱脂、酸洗および化成処理)を施された鋼管を溶融亜鉛めっき浴に一定時間浸漬して製造する。その後、該めっき浴から引き揚げた鋼管の内外面に空気または蒸気を吹き付けて、鋼管に過剰に付着した溶融亜鉛を吹き飛ばし、溶融亜鉛のたれを切った後、該鋼管は水冷槽に浸漬され冷却処理が施される。従来から溶融亜鉛めっき浴内から引き揚げられた鋼管の内外面の余剰亜鉛を除去する方法については品質を確保しつつ効率的な方法が数多く提案されている。 Galvanized steel pipes are manufactured by immersing pretreated steel pipes (defatting, pickling and chemical conversion treatment) in a hot-dip galvanized bath for a certain period of time. After that, air or steam is blown onto the inner and outer surfaces of the steel pipe pulled up from the plating bath to blow off the molten zinc excessively adhering to the steel pipe, and after cutting the hot-dip zinc dripping, the steel pipe is immersed in a water cooling tank for cooling treatment. Is given. Conventionally, many efficient methods have been proposed for removing excess zinc on the inner and outer surfaces of steel pipes pulled up from the hot-dip galvanizing bath while ensuring quality.

例えば、特許文献1には、引揚げ中の鋼管が外面ブロー装置内を通過する間に、該鋼管内にマンドレル棒を貫通させ、噴射ノズルから圧縮ガスを噴射して鋼管内面の余剰亜鉛を鋼管外に吹き出す方法で、めっき厚さを均一にすることができる技術が開示されている。 For example, in Patent Document 1, while the steel pipe being lifted passes through the outer surface blower, the mandrel rod is passed through the steel pipe, and the compressed gas is injected from the injection nozzle to remove the excess zinc on the inner surface of the steel pipe. A technique is disclosed in which the plating thickness can be made uniform by a method of blowing out.

また、特許文献2に開示の技術では、製造コスト低減の観点から、鋼管を溶融亜鉛浴中に浸漬した後、溶融亜鉛浴中から鋼管を長手方向に引揚げる過程で圧縮ガスにより鋼管外面の余剰亜鉛を除去し、続いて圧縮ガスにより鋼管内面の余剰亜鉛を除去する方法において、溶融亜鉛浴を低温に設定し、該溶融亜鉛浴中から鋼管を長手方向に引上げる過程で圧縮ガスにより鋼管外面の余剰亜鉛を除去した後、当該鋼管を前記溶融亜鉛浴温度より高温に加熱し、圧縮ガスにより鋼管内面余剰亜鉛を除去する方法が提案されている。 Further, in the technique disclosed in Patent Document 2, from the viewpoint of reducing the manufacturing cost, after the steel pipe is immersed in the molten zinc bath, the excess of the outer surface of the steel pipe is generated by the compressed gas in the process of pulling the steel pipe from the molten zinc bath in the longitudinal direction. In the method of removing zinc and then removing excess zinc on the inner surface of the steel pipe with compressed gas, the molten zinc bath is set to a low temperature, and the outer surface of the steel pipe is pulled up from the molten zinc bath in the longitudinal direction by the compressed gas. A method has been proposed in which the steel pipe is heated to a temperature higher than the molten zinc bath temperature after the excess zinc is removed, and the excess zinc on the inner surface of the steel pipe is removed by a compressed gas.

更に、生産性向上の観点から特許文献3には、鋼管を100〜600℃に予熱した後、430〜480℃の溶融亜鉛めっき浴中に20〜100秒浸漬してめっきを施し、次いで、溶融亜鉛めっき浴中のめっき鋼管を引揚げ、めっき鋼管の外面めっき付着量を制御する方法が開示されている。鋼管を予熱することでめっき槽内の浴温維持に必要な熱量を低減できるとしている。 Further, from the viewpoint of improving productivity, Patent Document 3 states that a steel pipe is preheated to 100 to 600 ° C., then immersed in a hot-dip galvanizing bath at 430 to 480 ° C. for 20 to 100 seconds for plating, and then melted. A method of pulling up a plated steel pipe in a galvanized bath and controlling the amount of plating on the outer surface of the plated steel pipe is disclosed. By preheating the steel pipe, the amount of heat required to maintain the bath temperature in the plating tank can be reduced.

特開2011− 63844号公報Japanese Unexamined Patent Publication No. 2011-63844 特開平 5−140722号公報Japanese Unexamined Patent Publication No. 5-140722 特開平11−246959号公報Japanese Unexamined Patent Publication No. 11-246959

しかしながら、上記従来の技術には、未だ解決すべき以下のような問題があった。上記従来技術には、亜鉛めっき鋼管の製造方法として、品質面、生産性に関する様々な技術が開示されているが、鋼管を亜鉛めっき浴に浸漬する際の生産性に関して重要な課題となる操業安定性の詳細については開示されていない。 However, the above-mentioned conventional technique still has the following problems to be solved. In the above-mentioned prior art, various techniques related to quality and productivity are disclosed as a method for manufacturing a galvanized steel pipe, but operational stability is an important issue regarding productivity when the steel pipe is immersed in a galvanized bath. No details of sex are disclosed.

本発明は上記事情に鑑みてなされたものであり、その目的とするところは、鋼管を亜鉛めっき浴に浸漬する際に亜鉛めっき鋼管を安定して製造する方法を提案し、その方法に適した鋼管の亜鉛めっき装置を提供することにある。 The present invention has been made in view of the above circumstances, and an object of the present invention is to propose a method for stably producing a galvanized steel pipe when the steel pipe is immersed in a galvanized bath, and is suitable for the method. The purpose is to provide a galvanizing apparatus for steel pipes.

発明者らは、上記に記した課題を解決するために鋭意検討を重ねた結果、亜鉛めっき鋼管の操業安定方法およびその方法に適した装置を見出した。上記課題を解決し、上記の目的を実現するため開発した本発明は、下記の要旨構成に示すとおりである。即ち、本発明は、第一に、鋼管を溶融亜鉛めっき浴に一定時間浸漬し、その後該めっき浴から引揚げて、亜鉛めっき鋼管を製造する方法において、回転軸に螺旋面を有するスクリューを用いて上記鋼管を溶融亜鉛めっき浴内に下降搬送し浸漬させるとともに、上記回転軸の螺旋面終端部に設置した払出し装置により上記鋼管を引揚げ装置へ払い出すことを特徴とする亜鉛めっき鋼管の製造方法を提案する。 As a result of diligent studies to solve the above-mentioned problems, the inventors have found a method for stabilizing the operation of galvanized steel pipes and a device suitable for the method. The present invention developed to solve the above problems and realize the above object is as shown in the following gist structure. That is, in the present invention, first, in a method of immersing a steel pipe in a hot-dip galvanized bath for a certain period of time and then pulling it out of the galvanized bath to manufacture a galvanized steel pipe, a screw having a spiral surface on a rotating shaft is used. The galvanized steel pipe is manufactured by lowering and transporting the steel pipe into a hot-dip galvanized bath and immersing it in the hot-dip galvanized bath, and discharging the steel pipe to a lifting device by a dispensing device installed at the end of the spiral surface of the rotating shaft. Suggest a method.

なお、本発明に係る亜鉛めっき鋼管の製造方法については、
a.上記払出し装置は、上記回転軸に上記螺旋面の外径から外に張り出して構成され、上記螺旋面終端部とは軸に対し円周方向で異なる位置に設置されていること、
b.上記スクリューが鋼管の長手方向に複数配設されていること、
c.上記スクリューを2列配設し、それぞれ外側の引揚げ装置に鋼管を払い出すこと、
d.亜鉛めっきを施される上記鋼管が溶接鋼管または鍛接鋼管であること、
がより好ましい解決手段になり得るものと考えられる。
Regarding the method for manufacturing a galvanized steel pipe according to the present invention,
a. The payout device is configured to project outward from the outer diameter of the helicoid on the rotating shaft, and is installed at a position different from the end of the helicoid in the circumferential direction with respect to the shaft.
b. Multiple screws are arranged in the longitudinal direction of the steel pipe,
c. Arrange the above screws in two rows and dispense the steel pipes to the outer lifting device.
d. The above steel pipe to be galvanized is a welded steel pipe or a forge welded steel pipe.
Can be a more preferred solution.

本発明は、第二に、溶融亜鉛めっき浴を構成するめっき槽と、該溶融亜鉛めっき浴中に鋼管を下降搬送し、浸漬させる、回転軸に螺旋面を有するスクリューと、該スクリューの螺旋面終端部を通過した上記鋼管を一旦受け止めるためのクレードルと、上記回転軸の螺旋面終端部に設けられた上記鋼管の払出し装置と、該払出し装置によって払い出された上記クレードル上の上記鋼管を引き揚げるための引揚げ装置とからなる鋼管の溶融亜鉛めっき装置を提供する。 Secondly, the present invention comprises a plating tank constituting a hot-dip galvanizing bath, a screw having a spiral surface on a rotating shaft for lowering and transporting a steel pipe into the hot-dip galvanizing bath, and a spiral surface of the screw. The cradle for temporarily receiving the steel pipe that has passed through the end portion, the steel pipe dispensing device provided at the end of the spiral surface of the rotating shaft, and the steel pipe on the cradle that has been dispensed by the dispensing device are pulled up. Provided is a hot dip galvanizing device for a steel pipe, which comprises a lifting device for the purpose.

なお、本発明に係る鋼管の溶融亜鉛めっき装置については、
e.上記払出し装置は、上記回転軸に上記螺旋面の外径から外に張り出して構成され、上記螺旋面終端部とは軸に対し円周方向で異なる位置に設置されていること、
f.上記スクリューが鋼管の長手方向に複数配設されていること、
がより好ましい解決手段になり得るものと考えられる。
Regarding the hot-dip galvanizing apparatus for steel pipes according to the present invention,
e. The payout device is configured to project outward from the outer diameter of the helicoid on the rotating shaft, and is installed at a position different from the end of the helicoid in the circumferential direction with respect to the shaft.
f. Multiple screws are arranged in the longitudinal direction of the steel pipe,
Can be a more preferred solution.

以上説明したように、本発明によれば、めっき浴内に鋼管を浸漬させる装置としてスクリューを用いるとともに、該スクリューにめっき浴内で引揚げ装置へ鋼管を払い出す機能を持たせることで、メンテナンス面で有利である。
対象鋼管の払い出し時を除き、払出し装置がめっき槽内設備や鋼管と接触しないように設置することで操業安定化を図ることが可能となる。
As described above, according to the present invention, a screw is used as a device for immersing a steel pipe in a plating bath, and the screw is provided with a function of discharging the steel pipe to a lifting device in the plating bath for maintenance. It is advantageous in terms of.
Except when the target steel pipe is dispensed, it is possible to stabilize the operation by installing the dispensing device so that it does not come into contact with the equipment in the plating tank or the steel pipe.

本発明の一実施形態を示す製造フロー図である。It is a manufacturing flow diagram which shows one Embodiment of this invention. 本発明の一実施形態を示す鋼管の溶融亜鉛めっき装置の上面図である。It is a top view of the hot dip galvanizing apparatus of a steel pipe which shows one Embodiment of this invention. 本発明の一実施形態を示す鋼管の溶融亜鉛めっき装置のA−A’視側面図である。It is a view side view of AA'of the hot dip galvanizing apparatus of a steel pipe which shows one Embodiment of this invention. 本発明の一実施形態を示す鋼管の溶融亜鉛めっき装置のB−B’視拡大図である。It is a BB'enlarged view of the hot dip galvanizing apparatus of a steel pipe which shows one Embodiment of this invention. 本発明の一実施形態を示す鋼管の溶融亜鉛めっき装置のスクリュー部のB−B’視拡大図である。It is a BB'enlarged view of the screw part of the hot dip galvanizing apparatus of a steel pipe which shows one Embodiment of this invention.

以下、本発明の実施の形態について図を参照しながら詳細に説明する。本発明はこれに限定されるものでなく、その要旨を変更しない範囲で適宜変更して実施することができる。
本発明における処理工程の概要として、一実施形態の製造フローを図1に示す。鋼管は、前処理工程にて脱脂、酸洗、化成処理を施されたのち、乾燥して溶融亜鉛めっき装置のめっき槽内亜鉛めっき浴に一定時間浸漬される。次いで、鋼管は該めっき浴から引き揚げられるが、引揚げた際に鋼管の内外面に空気または蒸気が吹き付けられ、過剰に付着した溶融亜鉛を除去してめっき付着量の調整が行われる。その後、鋼管は冷却槽にて冷却処理が施される。最後に亜鉛めっき鋼管は出荷前検査されることになる。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this, and the present invention can be appropriately modified and implemented without changing the gist thereof.
As an outline of the processing process in the present invention, the manufacturing flow of one embodiment is shown in FIG. The steel pipe is degreased, pickled, and converted in a pretreatment step, then dried and immersed in a galvanizing bath in a galvanizing apparatus of a hot-dip galvanizing apparatus for a certain period of time. Next, the steel pipe is withdrawn from the plating bath, and when it is withdrawn, air or steam is blown onto the inner and outer surfaces of the steel pipe to remove the excessively attached molten zinc and adjust the amount of plating adhesion. After that, the steel pipe is cooled in a cooling tank. Finally, galvanized steel pipes will be inspected before shipping.

本発明の一実施形態を示す鋼管の溶融亜鉛めっき装置の上面図およびA−A’視側面図をそれぞれ図2、図3に、スクリュー下側から見た(図3のB−B’視)拡大図を図4に示す。図2〜4に基づいて、本発明の方法を説明する。前処理後の鋼管2は、めっき槽1のボトム側からトップ側に搬送され、回転軸31に螺旋面32を有するスクリュー3の螺旋面32に懸架される。鋼管2はセンターガイド6とサイドガイド9によりスクリュー3の螺旋面32から外れないように支持されている。鋼管2は同期して回転している複数のスクリュー3の回転によって、めっき槽1下部に下降搬送され、溶融亜鉛めっき浴Zに浸漬されて溶融亜鉛めっき処理が施される。鋼管2はスクリュー3の回転によって下降するだけでなく、払出し位置を固定するために、スキッドプレート8により、めっき槽内での浸漬位置を固定されている。スクリュー3の回転によりめっき槽1内の下部にまで下降搬送された鋼管2は、螺旋面終端部11、12に到達後、クレードル4に着地する。その後、鋼管2は、スクリュー3の回転軸31に設置してある払出し装置10により、引揚げ装置5が設置してある方向(図2では外側)に順次払い出される。
図2の例では、払出し装置10が回転することで鋼管2を外側に押し出している。その後、鋼管2は、引揚げ装置5のフックに載った後、フックが上昇することでめっき槽1から引き揚げられる。鋼管2は引き揚げ時に引揚げ装置5のフックとストッパー7に挟まれてめっき浴中の姿勢が安定して搬送される。図3に示すように、鋼管2はトップ側を低く、ボトム側を高く傾斜させてスクリュー3に保持されており、鋼管2がめっき浴Zに浸漬された際、鋼管内の空気を排気することができるようになっている。また、鋼管2の引き上げの際には、鋼管内の溶融亜鉛の排出が容易になっている。
The top view and the AA'view side view of the hot dip galvanizing apparatus for a steel pipe showing an embodiment of the present invention are shown in FIGS. 2 and 3, respectively, as viewed from the lower side of the screw (BB'view in FIG. 3). An enlarged view is shown in FIG. The method of the present invention will be described with reference to FIGS. 2-4. The steel pipe 2 after the pretreatment is conveyed from the bottom side to the top side of the plating tank 1 and is suspended on the spiral surface 32 of the screw 3 having the spiral surface 32 on the rotating shaft 31. The steel pipe 2 is supported by the center guide 6 and the side guide 9 so as not to come off from the spiral surface 32 of the screw 3. The steel pipe 2 is carried down to the lower part of the plating tank 1 by the rotation of the plurality of screws 3 rotating in synchronization, and is immersed in the hot-dip galvanizing bath Z to be subjected to the hot-dip galvanizing treatment. The steel pipe 2 is not only lowered by the rotation of the screw 3, but also the immersion position in the plating tank is fixed by the skid plate 8 in order to fix the dispensing position. The steel pipe 2 lowered and conveyed to the lower part in the plating tank 1 by the rotation of the screw 3 reaches the spiral surface end portions 11 and 12 and then lands on the cradle 4. After that, the steel pipe 2 is sequentially dispensed in the direction in which the lifting device 5 is installed (outside in FIG. 2) by the dispensing device 10 installed on the rotating shaft 31 of the screw 3.
In the example of FIG. 2, the steel pipe 2 is pushed out by rotating the payout device 10. After that, the steel pipe 2 is placed on the hook of the lifting device 5 and then lifted from the plating tank 1 by raising the hook. The steel pipe 2 is sandwiched between the hook of the lifting device 5 and the stopper 7 at the time of lifting, and the posture in the plating bath is stably conveyed. As shown in FIG. 3, the steel pipe 2 is held by the screw 3 with the top side lowered and the bottom side tilted high, and when the steel pipe 2 is immersed in the plating bath Z, the air in the steel pipe is exhausted. Can be done. Further, when the steel pipe 2 is pulled up, the molten zinc in the steel pipe is easily discharged.

本発明では、スクリュー3の回転軸31の螺旋面終端部11、12に、鋼管2を引揚げ装置5へ払い出す払出し装置10が設置されている。払出し装置10をスクリュー3の回転軸31に設置することで鋼管2のめっき浴Z内への浸漬と払出しを1つの装置で行うことが可能となりメンテナンス性の面でも優位である。 In the present invention, a payout device 10 for paying out the steel pipe 2 to the lifting device 5 is installed at the spiral surface end portions 11 and 12 of the rotating shaft 31 of the screw 3. By installing the dispensing device 10 on the rotating shaft 31 of the screw 3, it is possible to immerse and dispense the steel pipe 2 in the plating bath Z with one device, which is also advantageous in terms of maintainability.

図2の例では、溶融亜鉛めっき装置は鋼管2を同時に2本ずつめっき槽1内に搬送できる装置を示している。また、図2に示すめっき装置において、スクリュー3の本数は鋼管1本に対して、搬送方向(鋼管の長手方向)に3本ずつ設置されている。鋼管2の姿勢の安定のために、鋼管1本あたり少なくとも2本のスクリューを必要とする。めっき処理を施す鋼管の長さによるが、2本の場合、めっき浴Z投入直後の搬送方向の鋼管2の姿勢が不安定となる可能性が高いため、鋼管1本に対しスクリューを3本以上設置するのが望ましい。 In the example of FIG. 2, the hot-dip galvanizing apparatus shows an apparatus capable of simultaneously transporting two steel pipes 2 into the plating tank 1. Further, in the plating apparatus shown in FIG. 2, three screws 3 are installed in the transport direction (longitudinal direction of the steel pipe) with respect to one steel pipe. At least two screws are required for each steel pipe to stabilize the posture of the steel pipe 2. Depending on the length of the steel pipe to be plated, if there are two, there is a high possibility that the posture of the steel pipe 2 in the transport direction immediately after the plating bath Z is put in will be unstable, so three or more screws are used for one steel pipe. It is desirable to install it.

図4には、鋼管2、2’を2列溶融亜鉛めっきする装置をスクリュー下側から見た図を示す。ここで、鋼管2を下降搬送するスクリュー3の回転方向13と鋼管2’を下降搬送するスクリュー3’の回転方向14とは互いに逆回転となっている。図4の例では、鋼管2、2’が螺旋面終端部11、12をそれぞれ通過する時期、および、払出し装置10、10’により引揚げ装置5にそれぞれ払い出される時期は同期している。
また、スクリューを2列に設置する場合、鋼管の払い出し方向をそれぞれ外側とすることで装置全体をコンパクトに収めることができる。
FIG. 4 shows a view of a device for hot-dip galvanizing steel pipes 2 and 2'in two rows from the lower side of the screw. Here, the rotation direction 13 of the screw 3 that carries down the steel pipe 2 and the rotation direction 14 of the screw 3'that carries down the steel pipe 2'are opposite to each other. In the example of FIG. 4, the time when the steel pipes 2 and 2'pass through the spiral surface end portions 11 and 12, respectively, and the time when the steel pipes 2 and 2'are discharged to the lifting device 5 by the payout devices 10 and 10'are synchronized.
Further, when the screws are installed in two rows, the entire device can be compactly accommodated by setting the discharge direction of the steel pipes to the outside.

図4のスクリュー部近傍を更に拡大して図5に示す。払出し装置10はスクリュー3軸にスクリュー外径から張り出して構成し、払出し装置10をスクリュー3の回転軸31へ設置する位置は、螺旋面終端部11と円周方向で異なる位置に設置することが好ましい。図5に基づいて詳細に説明する。ここで、鋼管2の外径をD、スクリュー3の螺旋面外径半径をR、スクリューの回転軸31の外径半径をr、払出し装置10の長さ(スクリュー3の回転軸31中心から払出し装置10先端まで)をAとし、スクリュー3の回転軸31に対し円周方向で螺旋面終端部11から払出し装置10までのスクリュー回転方向の角度をθとする。払出し装置10の長さAは、少なくともスクリュー3の螺旋面外径半径Rより長くし、鋼管2が引揚げ装置5のフックに十分に載るまで払い出せる長さが必要である。また、スクリューの回転時に他のめっき浴内装置に接触しない長さにとどめる必要がある。好ましくは、払出し装置10の張り出し長Aは、鋼管外径Dに対し、4.5D≦A≦9.0Dの範囲である。 The vicinity of the screw portion in FIG. 4 is further enlarged and shown in FIG. The payout device 10 is configured to project from the outer diameter of the screw on the screw 3 shaft, and the position where the payout device 10 is installed on the rotation shaft 31 of the screw 3 may be installed at a position different from that of the helicoid end portion 11 in the circumferential direction. preferable. This will be described in detail with reference to FIG. Here, the outer diameter of the steel pipe 2 is D, the outer diameter radius of the helicoid surface of the screw 3 is R, the outer diameter radius of the rotating shaft 31 of the screw is r, and the length of the dispensing device 10 (dispensing from the center of the rotating shaft 31 of the screw 3). Let A be the tip of the device 10), and let θ A be the angle in the screw rotation direction from the end of the helicoid surface 11 to the payout device 10 in the circumferential direction with respect to the rotation axis 31 of the screw 3. The length A of the payout device 10 needs to be at least longer than the spiral surface outer diameter radius R of the screw 3 and has a length that allows the steel pipe 2 to be sufficiently placed on the hook of the lifting device 5. In addition, it is necessary to keep the length so that it does not come into contact with other plating bath devices when the screw rotates. Preferably, the overhang length A of the payout device 10 is in the range of 4.5D ≦ A ≦ 9.0D with respect to the steel pipe outer diameter D.

さらに、鋼管2の外径Dは、スクリュー3の回転軸31の外径半径rに対し、D<R−rの関係にあることが好ましい。そして、品質の面からスクリュー螺旋面の間隔hを鋼管2の外径Dより大きくしておく必要がある。好ましくは、1.0D≦R≦3.0Dおよび1.8D≦h≦2.6Dの範囲である。いずれも、下限未満では、鋼管がスクリューとの摩擦で傷つくおそれがあり、上限を超えて設計するのは、過大な設備となり、生産性を阻害する。また、スクリュー3の回転軸31の外径半径rについては、スクリューの構造強度と重量のバランスから、0.05D≦r≦0.9Dの範囲にするのが好ましい。また、30A〜80Aの小径鋼管の場合には、2.5D≦R≦3.0D、0.6D≦r≦0.9Dおよび4.5D≦A≦5.5Dの範囲とすることがさらに好ましく、90A〜125Aの範囲の鋼管の場合には、1.05D≦R≦1.1D、0.1D≦r≦0.3Dおよび4.5D≦A≦5.5Dの範囲とすることがさらに好ましく、150A以上の大径鋼管の場合は、スクリューを1列として、1.0D≦R≦1.8D、0.05D≦r≦0.3D、7D≦A≦9Dおよび1.9D≦h≦2.4Dの範囲とすることがさらに好ましい。大径の鋼管は、自重がより大きいので、スクリュー内での揺動を抑えるために、上記範囲とすることが好ましい。
サイドガイド9はスクリューの下端近傍まで延伸されており、鋼管の払い出し方向で鋼管2がスクリュー3からはみ出ないように、スクリューの螺旋面外周の接線に接して配置されていることが好ましい。
Further, it is preferable that the outer diameter D of the steel pipe 2 has a relationship of D <R-r with respect to the outer diameter radius r of the rotating shaft 31 of the screw 3. Then, from the viewpoint of quality, it is necessary to make the distance h between the screw spiral surfaces larger than the outer diameter D of the steel pipe 2. Preferably, it is in the range of 1.0D ≦ R ≦ 3.0D and 1.8D ≦ h ≦ 2.6D. In either case, if the value is less than the lower limit, the steel pipe may be damaged by friction with the screw, and if the design exceeds the upper limit, the equipment will be excessive and productivity will be hindered. Further, the outer radius r of the rotating shaft 31 of the screw 3 is preferably set in the range of 0.05D ≦ r ≦ 0.9D from the balance between the structural strength and the weight of the screw. Further, in the case of a small diameter steel pipe of 30A to 80A, it is more preferable to set the range of 2.5D ≦ R ≦ 3.0D, 0.6D ≦ r ≦ 0.9D and 4.5D ≦ A ≦ 5.5D. In the case of steel pipes in the range of 90A to 125A, it is more preferable to set the range of 1.05D ≦ R ≦ 1.1D, 0.1D ≦ r ≦ 0.3D and 4.5D ≦ A ≦ 5.5D. , In the case of a large diameter steel pipe of 150 A or more, 1.0D ≦ R ≦ 1.8D, 0.05D ≦ r ≦ 0.3D, 7D ≦ A ≦ 9D and 1.9D ≦ h ≦ 2 with one row of screws. It is more preferably in the range of .4D. Since a large-diameter steel pipe has a larger weight, it is preferable to set it within the above range in order to suppress swinging in the screw.
The side guide 9 is extended to the vicinity of the lower end of the screw, and is preferably arranged in contact with the tangent line on the outer periphery of the spiral surface of the screw so that the steel pipe 2 does not protrude from the screw 3 in the discharge direction of the steel pipe.

まず、スクリューが1列の場合の払出し装置10の設置位置を検討する。スクリューの螺旋面終端部11が鋼管長手と直交する方向(基準)からθ1だけ回転し、スクリューの螺旋面終端部11の先端とサイドガイド9とのすき間dが鋼管外径Dより大きくなった時に、該螺旋面終端部11まで搬送された鋼管2はスクリュー3の支持を離れてクレードル4上に着地する。このとき、払出し装置10が鋼管2の落下を妨げないための設置位置(螺旋面終端部11と払出し装置10の間の回転角θA)は、以下の関係にあることが好ましい。
[θ1+θA<90°の場合]
R−d=A×cos(θ1+θA)<R−D ・・・(1)
または、
[270°<θ1+θAの場合]
R−d=A×cos{360°−(θ1+θA)}<R−D ・・・(2)
である。ここで、R−r>d=R×{1−cos(θ1)}>Dである。
展開すると、
cos-1(r/R)>θ1>cos-1{(R−D)/R} ・・・(3)
かつ
360°−cos-1{(R−D)/A}>θ1+θA>cos-1{(R−D)/A}
・・・(4)
である。スクリューが1列の場合には、90°≦θ1+θA≦270°の範囲で払出し装置10が、対象鋼管2の払い出し前に接触する場合はない。
First, the installation position of the payout device 10 when the screws are in one row is examined. The helicoid end portion 11 of the screw rotates by θ 1 from the direction (reference) orthogonal to the length of the steel pipe, and the gap d between the tip of the helicoid end portion 11 of the screw and the side guide 9 becomes larger than the outer diameter D of the steel pipe. Occasionally, the steel pipe 2 conveyed to the end of the helicoid 11 leaves the support of the screw 3 and lands on the cradle 4. At this time, the installation position (rotation angle θ A between the spiral surface end portion 11 and the payout device 10) so that the payout device 10 does not prevent the steel pipe 2 from falling is preferably in the following relationship.
[When θ 1 + θ A <90 °]
Rd = A × cos (θ 1 + θ A ) <RD ・ ・ ・ (1)
Or
[When 270 ° <θ 1 + θ A ]
Rd = A × cos {360 ° − (θ 1 + θ A )} <RD ・ ・ ・ (2)
Is. Here, R-r> d = R × {1-cos (θ 1 )}> D.
When unfolded,
cos -1 (r / R)> θ 1 > cos -1 {(RD) / R} ・ ・ ・ (3)
And 360 ° -cos -1 {(RD) / A}> θ 1 + θ A > cos -1 {(RD) / A}
... (4)
Is. When the screws are in a single row, the dispensing device 10 does not come into contact with the target steel pipe 2 before dispensing in the range of 90 ° ≤ θ 1 + θ A ≤ 270 °.

上記条件を外れた場合、払出し装置10が鋼管2の落下を妨げるとともに、払出し装置10がスクリュー3の回転とともに鋼管表面をこすり、接触キズを発生させる要因になるほか、鋼管2がスクリュー3、払出し装置10およびサイドガイド9の間に挟まれて、鋼管の曲がり発生の要因となるおそれがある。 If the above conditions are not met, the payout device 10 prevents the steel pipe 2 from falling, and the payout device 10 rubs the surface of the steel pipe as the screw 3 rotates, causing contact scratches. In addition, the steel pipe 2 pays out the screw 3. It may be sandwiched between the device 10 and the side guide 9 and cause bending of the steel pipe.

次に、図2,図4および図5に示すスクリューが2列の場合を検討する。ここで、スクリュー3、3’は同期して互いに逆方向に回転しており、鋼管2、2’は同時にスクリューから搬出されるものとし、列間隔をBとする。設備をコンパクトに設計する観点からは、Bを極力小さくすることが好ましいが、2列の鋼管をめっき処理する際、鋼管2が対向するスクリュー3’に接触しないようにB>R−rとすることが好ましい。より好ましくは、2.4D≦B≦2.8Dである。払出し装置10が対向する鋼管2’と干渉しないための設置位置(螺旋面終端部11と払出し装置10の間の回転角θA)は以下の関係を満足することが好ましい。
[90°≦θ1+θA<180°の場合]
R+B−d=A×cos(180−θ1−θA)<R+B−D ・・・(5)
または
[180°<θ1+θA≦270°の場合]
R+B−d=A×cos{(θ1+θA)−180°}<R+B−D ・・・(6)
である。これを展開すると、
180°−cos-1{(R+B−D)/A}>θ1+θA≧90° ・・・(7)
または
270°≧θ1+θA>180°+cos-1{(R+B−D)/A} ・・・(8)
となる。1列の場合の条件と組み合わせて、
cos-1(r/R)>θ1 >cos-1{(R−D)/R} ・・・(3)
かつ
180°−cos-1{(R+B−D)/A}>θ1+θA>cos-1{(R−D)/A} ・・・(9)
または
cos-1(r/R)>θ1 >cos-1{(R−D)/R} ・・・(3)
かつ
360°−cos-1{(R−D)/A}>θ1+θA>180°+cos-1{(R+B−D)/A} ・・・(10)
と計算される。これらの条件を満足する範囲では、鋼管2,2’がスクリューから排出された時点で払出し装置10が鋼管2,2’と接触することはない。ただし、180°>θ1+θAの場合には、本来の払出し装置10が鋼管2を払い出す前に、対向する払出し装置10’が鋼管2を押し出してしまう。したがって、2列のスクリューを設置する場合には、払出し装置10の設置角度θA
cos-1(r/R)>θ1 >cos-1{(R−D)/R} ・・・(3)
かつ
360°−cos-1{(R−D)/A}>θ1+θA>180°+cos-1{(R+B−D)/A} ・・・(10)
を満足することが好ましい。
Next, consider the case where the screws shown in FIGS. 2, 4 and 5 are in two rows. Here, it is assumed that the screws 3 and 3'rotate in opposite directions in synchronization with each other, and the steel pipes 2 and 2'are simultaneously carried out from the screw, and the row spacing is B. From the viewpoint of designing the equipment compactly, it is preferable to make B as small as possible, but when plating the two rows of steel pipes, B> Rr is set so that the steel pipes 2 do not come into contact with the opposing screws 3'. Is preferable. More preferably, 2.4D ≦ B ≦ 2.8D. It is preferable that the installation position (rotation angle θ A between the spiral surface end portion 11 and the payout device 10) so that the payout device 10 does not interfere with the opposing steel pipe 2'satisfies the following relationship.
[When 90 ° ≤ θ 1 + θ A <180 °]
R + BD = A × cos (180 −θ 1 −θ A ) <R + BD ・ ・ ・ (5)
Or [when 180 ° <θ 1 + θ A ≤ 270 °]
R + BD = A × cos {(θ 1 + θ A ) -180 °} <R + BD ... (6)
Is. If you expand this,
180 ° -cos -1 {(R + BD) / A}> θ 1 + θ A ≧ 90 ° ・ ・ ・ (7)
Or 270 ° ≧ θ 1 + θ A > 180 ° + cos -1 {(R + BD) / A} ・ ・ ・ (8)
Will be. In combination with the condition for one row,
cos -1 (r / R)> θ 1 > cos -1 {(RD) / R} ・ ・ ・ (3)
And 180 ° -cos -1 {(R + BD) / A}> θ 1 + θ A > cos -1 {(RD) / A} ... (9)
Or cos -1 (r / R)> θ 1 > cos -1 {(RD) / R} ・ ・ ・ (3)
And 360 ° -cos -1 {(RD) / A}> θ 1 + θ A > 180 ° + cos -1 {(R + BD) / A} ... (10)
Is calculated. As long as these conditions are satisfied, the payout device 10 does not come into contact with the steel pipes 2 and 2'when the steel pipes 2 and 2'are discharged from the screw. However, when 180 °> θ 1 + θ A , the opposing payout device 10'extrudes the steel pipe 2 before the original payout device 10 pays out the steel pipe 2. Therefore, when installing two rows of screws, the installation angle θ A of the payout device 10 is cos -1 (r / R)> θ 1 > cos -1 {(RD) / R} ... ( 3)
And 360 ° -cos -1 {(RD) / A}> θ 1 + θ A > 180 ° + cos -1 {(R + BD) / A} ... (10)
It is preferable to satisfy.

通常、引揚げ装置5のフックの動作はスクリュー3の回転角度と同期して制御しているため、対向する払出し装置10’が本来の払出し装置10の前に鋼管2と接触し、引揚げ装置5側に鋼管2が払い出されると、引揚げ装置5のフックが本来の待機位置ではなく存在することにより、フックを下端の待機位置へ移動すると鋼管2がフックとクレードル4との間に挟まれることになり、鋼管の曲がり発生の要因や、接触キズを発生させる要因となる。 Normally, since the operation of the hook of the lifting device 5 is controlled in synchronization with the rotation angle of the screw 3, the opposing payout device 10'contacts the steel pipe 2 in front of the original payout device 10 and the pulling device When the steel pipe 2 is paid out to the 5 side, the hook of the lifting device 5 exists instead of the original standby position, so that when the hook is moved to the lower end standby position, the steel pipe 2 is sandwiched between the hook and the cradle 4. As a result, it becomes a factor of bending of the steel pipe and a factor of causing contact scratches.

図2〜5では、一例として亜鉛めっき装置内に設置したスクリューの配置を2列の場合について記載しているが、鋼管のサイズによっては1列の場合や2列以上設置することも可能であり、スクリューの配置列数については特に限定しない。 Although FIGS. 2 to 5 show the case where the screws installed in the galvanizing apparatus are arranged in two rows as an example, it is possible to install them in one row or two or more rows depending on the size of the steel pipe. , The number of rows of screws is not particularly limited.

なお、本発明の方法は、素管として、鍛接鋼管や溶接鋼管に好適に適用できる。鍛接鋼管とは、鋼帯素材、例えば熱延鋼帯全体を加熱後、熱間で成形し、シーム部は鍛接によって接合してパイプに成形した鋼管をいう。溶接鋼管とは、いわゆる、電縫鋼管であり、鋼帯素材、例えば熱延鋼帯を成形機で管状に成形し,高周波溶接機でシームの高速溶接を行う。 The method of the present invention can be suitably applied to forge-welded steel pipes and welded steel pipes as raw pipes. The forge-welded steel pipe is a steel pipe in which a steel strip material, for example, the entire hot-rolled steel strip is heated and then hot-formed, and the seam portion is joined by forge welding to form a pipe. The welded steel pipe is a so-called electrosewn steel pipe, and a steel strip material, for example, a hot-rolled steel strip is formed into a tubular shape by a molding machine, and high-speed seams are welded by a high-frequency welder.

図1に示す製造フローにて鋼管の亜鉛めっきを行った。めっき槽内の各装置配置については、図2および図3に示す配置で設置した。ここで、めっき槽は、内法で長さ7m×幅2m×深さ5mのものを用い、鋼管の長さは5mであった。鋼管径50Aの場合のスクリュー回転速度は、約9rpmであり、鋼管のめっき浴への浸漬時間は2〜3分であった。 The steel pipe was galvanized according to the manufacturing flow shown in FIG. The arrangement of each device in the plating tank was the arrangement shown in FIGS. 2 and 3. Here, the plating tank used was an internal plating tank having a length of 7 m, a width of 2 m, and a depth of 5 m, and the length of the steel pipe was 5 m. When the steel pipe diameter was 50 A, the screw rotation speed was about 9 rpm, and the immersion time of the steel pipe in the plating bath was 2 to 3 minutes.

50A(外径D=60.5mm)の鋼管の場合、スクリュー3の回転軸31の外径半径r=0.8D(48.4mm)、スクリューの外径半径R=2.8D(169.4mm)、スクリューピッチh=2.4D(145.2mm)、払出し装置のスクリュー3の回転軸31中心からの張り出し長A=5D(302.5)およびスクリュー列間隔B=2.7D(163.4mm)であった。上記式に従いθ1およびθAを計算すると、(3)式から
73.4°>θ1>44.4°
となり、スクリューが1列の場合には、(4)式から
248°>θA>22°
と、そして、スクリューが2列の場合には(10)式から
248°>θA>154°
と計算され、払出し装置の好適な設置範囲となる。
In the case of a steel pipe of 50A (outer diameter D = 60.5mm), the outer diameter radius r = 0.8D (48.4mm) of the rotating shaft 31 of the screw 3 and the outer diameter radius R = 2.8D (169.4mm) of the screw. ), Screw pitch h = 2.4D (145.2 mm), overhang length A = 5D (302.5) from the center of the rotating shaft 31 of the screw 3 of the payout device, and screw row spacing B = 2.7D (163.4 mm). )Met. When θ 1 and θ A are calculated according to the above equation, 73.4 °> θ 1 > 44.4 ° from equation (3).
When the screws are in one row, 248 °> θ A > 22 ° from equation (4).
And, when there are two rows of screws, from equation (10), 248 °> θ A > 154 °
Is calculated, and it becomes a suitable installation range of the payout device.

表1に本発明の溶融亜鉛めっき装置にて亜鉛めっき処理を実施した場合の引揚げ不良発生率の結果を示す。引揚げ不良発生率は、鋼管の亜鉛めっき処理を施した際に亜鉛めっき装置から引き揚げられた鋼管について、めっき槽内で発生した曲がり、キズ、引揚げトラブルなどの発生本数についてカウントし、総処理本数に対する割合で算出した。併せて、素管である鋼管の種類を示す。 Table 1 shows the results of the occurrence rate of withdrawal defects when the galvanizing treatment is performed by the hot-dip galvanizing apparatus of the present invention. The occurrence rate of defective withdrawal is calculated by counting the number of bends, scratches, and withdrawal troubles that occur in the plating tank for the steel pipes that have been withdrawn from the galvanizing equipment when the steel pipes have been galvanized. Calculated as a ratio to the number. At the same time, the types of steel pipes that are raw pipes are shown.

Figure 2020132941
Figure 2020132941

表1に示すように好適例の処理を行うことにより、鋼管の溶融亜鉛めっき処理における引揚げ不良の発生を軽減することが明らかとなり、生産性が向上した。 As shown in Table 1, it was clarified that the occurrence of repatriation defects in the hot-dip galvanizing treatment of the steel pipe was reduced by performing the treatment of the preferred example, and the productivity was improved.

本発明は、鋼管だけでなく、他の金属管や、長尺の棒材などにも適用可能である。 The present invention can be applied not only to steel pipes, but also to other metal pipes, long rods, and the like.

1 めっき槽
2、2’ 鋼管
3、3’ スクリュー
31 回転軸
32 螺旋面
4 クレードル
5 引揚げ装置
6 センターガイド
7 ストッパー
8 スキッドプレート
9 サイドガイド
10、10’ 払出し装置
11 螺旋面終端部1
12 螺旋面終端部2
13 スクリュー回転方向1
14 スクリュー回転方向2
Z 溶融亜鉛めっき浴
1 Plating tank 2, 2'Steel pipe 3, 3'Screw 31 Rotating shaft 32 Spiral surface 4 Cradle 5 Lifting device 6 Center guide 7 Stopper 8 Skid plate 9 Side guide 10, 10'Dispensing device 11 Spiral surface end 1
12 Helicoid end 2
13 Screw rotation direction 1
14 Screw rotation direction 2
Z Hot-dip galvanizing bath

Claims (8)

鋼管を溶融亜鉛めっき浴に一定時間浸漬し、その後該めっき浴から引揚げて、亜鉛めっき鋼管を製造する方法において、回転軸に螺旋面を有するスクリューを用いて前記鋼管を溶融亜鉛めっき浴内に下降搬送し浸漬させるとともに、前記回転軸の螺旋面終端部に設置した払出し装置により前記鋼管を引揚げ装置へ払い出すことを特徴とする亜鉛めっき鋼管の製造方法。 In a method of manufacturing a galvanized steel pipe by immersing the steel pipe in a hot-dip galvanized bath for a certain period of time and then pulling it out of the galvanized bath, the steel pipe is placed in the hot-dip galvanized bath using a screw having a spiral surface on the rotation axis. A method for manufacturing a galvanized steel pipe, characterized in that the steel pipe is lowered and immersed, and the steel pipe is discharged to a lifting device by a dispensing device installed at the end of the spiral surface of the rotating shaft. 前記払出し装置は、前記回転軸に前記螺旋面の外径から外に張り出して構成され、前記螺旋面終端部とは軸に対し円周方向で異なる位置に設置されていることを特徴とする請求項1に記載の亜鉛めっき鋼管の製造方法。 The payout device is configured to project from the outer diameter of the helicoid surface to the rotating shaft, and is installed at a position different from the end portion of the helicoid surface in the circumferential direction. Item 2. The method for manufacturing a galvanized steel pipe according to Item 1. 前記スクリューが鋼管の長手方向に複数配設されていることを特徴とする請求項1または2に記載の亜鉛めっき鋼管の製造方法。 The method for manufacturing a galvanized steel pipe according to claim 1 or 2, wherein a plurality of the screws are arranged in the longitudinal direction of the steel pipe. 前記スクリューを2列配設し、それぞれ外側の引揚げ装置に鋼管を払い出すことを特徴とする請求項1〜3のいずれか1項に記載の亜鉛めっき鋼管の製造方法。 The method for manufacturing a galvanized steel pipe according to any one of claims 1 to 3, wherein the screws are arranged in two rows, and the steel pipe is dispensed to an outer lifting device. 亜鉛めっきを施される前記鋼管が溶接鋼管または鍛接鋼管であることを特徴とする請求項1〜4のいずれか1項に記載の亜鉛めっき鋼管の製造方法。 The method for producing a galvanized steel pipe according to any one of claims 1 to 4, wherein the galvanized steel pipe is a welded steel pipe or a forge welded steel pipe. 溶融亜鉛めっき浴を構成するめっき槽と、
該溶融亜鉛めっき浴中に鋼管を下降搬送し、浸漬させる、回転軸に螺旋面を有するスクリューと、
該スクリューの螺旋面終端部を通過した前記鋼管を一旦受け止めるためのクレードルと、
前記回転軸の螺旋面終端部に設けられた前記鋼管の払出し装置と、
該払出し装置によって払い出された前記クレードル上の前記鋼管を引き揚げるための引揚げ装置とからなる鋼管の溶融亜鉛めっき装置。
The plating tank that constitutes the hot-dip galvanizing bath and
A screw having a spiral surface on the rotating shaft for lowering and immersing the steel pipe in the hot-dip galvanizing bath.
A cradle for temporarily receiving the steel pipe that has passed through the end of the spiral surface of the screw, and
The steel pipe dispensing device provided at the end of the spiral surface of the rotating shaft, and
A hot-dip galvanizing device for a steel pipe, which comprises a lifting device for lifting the steel pipe on the cradle that has been dispensed by the dispensing device.
前記払出し装置は、前記回転軸に前記螺旋面の外径から外に張り出して構成され、前記螺旋面終端部とは軸に対し円周方向で異なる位置に設置されていることを特徴とする請求項6に記載の鋼管の溶融亜鉛めっき装置。 The payout device is configured such that the rotating shaft projects outward from the outer diameter of the helicoid surface, and is installed at a position different from the end portion of the spiral surface in the circumferential direction. Item 6. The hot-dip galvanizing apparatus for steel pipes according to Item 6. 前記スクリューが鋼管の長手方向に複数配設されていることを特徴とする請求項6または7に記載の鋼管の溶融亜鉛めっき装置。 The hot-dip galvanizing apparatus for a steel pipe according to claim 6 or 7, wherein a plurality of the screws are arranged in the longitudinal direction of the steel pipe.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112981295A (en) * 2021-01-24 2021-06-18 党君英 Surface coating device for aluminum alloy product
CN115404425A (en) * 2022-07-08 2022-11-29 李宁 Device for improving coating quality of hot-dip galvanized steel pipe
CN117845155A (en) * 2024-02-19 2024-04-09 山东华恒新材料有限公司 Zinc-plating hanging device for hot dip galvanizing pipe fitting
JP7484832B2 (en) 2021-07-06 2024-05-16 Jfeスチール株式会社 Metal pipe conveying device and method for manufacturing plated metal pipe

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Publication number Priority date Publication date Assignee Title
US3410200A (en) * 1964-06-15 1968-11-12 Vallourec Automatic equipment for galvanizing tubes
DE1946192A1 (en) * 1968-09-13 1970-03-19 Vallourec Device for electroplating pipes
JP2013100587A (en) * 2011-11-09 2013-05-23 Nippon Steel & Sumitomo Metal Corp Hot-dip galvanized steel pipe

Patent Citations (3)

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US3410200A (en) * 1964-06-15 1968-11-12 Vallourec Automatic equipment for galvanizing tubes
DE1946192A1 (en) * 1968-09-13 1970-03-19 Vallourec Device for electroplating pipes
JP2013100587A (en) * 2011-11-09 2013-05-23 Nippon Steel & Sumitomo Metal Corp Hot-dip galvanized steel pipe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112981295A (en) * 2021-01-24 2021-06-18 党君英 Surface coating device for aluminum alloy product
JP7484832B2 (en) 2021-07-06 2024-05-16 Jfeスチール株式会社 Metal pipe conveying device and method for manufacturing plated metal pipe
CN115404425A (en) * 2022-07-08 2022-11-29 李宁 Device for improving coating quality of hot-dip galvanized steel pipe
CN117845155A (en) * 2024-02-19 2024-04-09 山东华恒新材料有限公司 Zinc-plating hanging device for hot dip galvanizing pipe fitting

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