JP2003166010A - Device and method for removing deposit on kr impeller - Google Patents
Device and method for removing deposit on kr impellerInfo
- Publication number
- JP2003166010A JP2003166010A JP2001363756A JP2001363756A JP2003166010A JP 2003166010 A JP2003166010 A JP 2003166010A JP 2001363756 A JP2001363756 A JP 2001363756A JP 2001363756 A JP2001363756 A JP 2001363756A JP 2003166010 A JP2003166010 A JP 2003166010A
- Authority
- JP
- Japan
- Prior art keywords
- impeller
- deposits
- deposit
- function
- facility
- 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
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、ＫＲ設備の撹拌
用インペラーに付着した精錬剤あるいは地金等の付着物
をオンラインで除去するＫＲインペラー付着物除去装置
及び除去方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a KR impeller deposit removing device and a removing method for online removing deposits such as refining agents or ingots adhering to a stirring impeller of KR equipment.
【０００２】[0002]
【従来の技術】一般にＫＲ設備は主に溶銑の脱硫を目的
として、溶銑鍋等の容器内の溶銑に脱硫材を投入し、図
１に示すような攪拌用インペラー１を用いて溶銑を機械
的に撹拌することにより脱硫反応をさせる設備である。
従って、ＫＲ設備は回転機能を有し、通常はインペラー
を鍋内へ移動するための昇降機能を有している。このイ
ンペラーそのものは、表面に耐火物が施工されており、
処理を重ねると図２に示すような脱硫剤、スラグ、地金
等がインペラーに付着する。このインペラーに付着物が
付くと、脱硫剤巻き込み能力低下を招き、脱硫効率が低
下するためインペラーを交換せざるを得ない状態とな
る。2. Description of the Related Art Generally, in KR equipment, a desulfurizing material is put into hot metal in a container such as a hot metal ladle mainly for the purpose of desulfurizing hot metal, and the hot metal is mechanically fed by using an impeller 1 for stirring as shown in FIG. It is a facility for carrying out a desulfurization reaction by stirring the mixture.
Therefore, the KR equipment has a rotating function and usually has an elevating function for moving the impeller into the pan. This impeller itself has a refractory material on its surface,
When the treatment is repeated, desulfurizing agent, slag, metal and the like as shown in FIG. 2 adhere to the impeller. If deposits adhere to the impeller, the ability to entrain the desulfurizing agent is reduced, and the desulfurization efficiency is reduced, so that the impeller must be replaced.
【０００３】一方、これまでのＫＲ設備は、設備稼働率
向上や脱硫効率向上を目的として、例えば、実開平５−
３７９４９号公報に示されているようなインペラーの交
換を容易にする手段やインペラー羽根形状の改善、特開
平１１−９２８１１号公報に示されているような電磁撹
拌を併用した均一撹拌による脱硫効率向上対策等がなさ
れてきた。On the other hand, the conventional KR equipment, for example, has been developed for the purpose of improving equipment operating rate and desulfurization efficiency.
Improving the means for facilitating the replacement of the impeller and the shape of the impeller blades as disclosed in JP 37949, and improving the desulfurization efficiency by uniform stirring together with the electromagnetic stirring as disclosed in JP-A-11-92811. Measures have been taken.
【０００４】[0004]
【発明が解決しようとする課題】しかし、付着した地金
等の積極的に除去する方法については、付着物原因での
インペラー交換をする必要がなくなり、設備稼働率向上
に繋がるというメリットが大きいにもかかわらず、ほと
んど対策がなされてこなかったのが実状である。そのた
め従来、付着物の除去作業は人力で行なっており、人力
での付着物除去作業は、約１０００℃の熱間状態での作
業となり作業効率が悪く、また、インペラーの冷却後に
作業を行うため、インペラー交換と同様の設備休止時間
を要していた。However, with regard to the method for positively removing the adhered metal etc., it is not necessary to replace the impeller due to the adhered material, and this has a great advantage that it leads to an improvement in the facility operating rate. Nevertheless, the fact is that little measures have been taken. Therefore, conventionally, the work of removing the deposits is performed manually, and the work of removing the deposits manually is performed in a hot state of about 1000 ° C., and the work efficiency is poor, and the work is performed after the impeller is cooled. The same equipment downtime as the impeller replacement was required.
【０００５】また、熱間除去作業を機械化したとしても
インペラー形状が複雑で、しかも、図２に示すように付
着物除去範囲は広く、その除去範囲をカバーしようとす
ると、大掛かりな重機となってしまい、ＫＲ架構内への
設置は困難であるといった問題があった。そこで本発明
は、ＫＲ設備が有している機能を活用し、大掛かりな機
械設備の設置を行わず、インペラーの付着物除去作業を
効率よく行う方法を提供することを目的とする。Further, even if the hot removing work is mechanized, the impeller shape is complicated, and as shown in FIG. 2, the deposit removing range is wide, and when trying to cover the removing range, it becomes a large heavy machine. There was a problem that it was difficult to install in the KR frame. Therefore, an object of the present invention is to provide a method for efficiently removing the deposits on the impeller by utilizing the functions of the KR equipment and without installing large-scale mechanical equipment.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記課題を解
決するものであって、その要旨は次の通りである。
（１）昇降機能を有するインペラーを備えたＫＲ設備に
おけるインペラーの付着物を除去する装置であって、該
インペラーの動きと同調しない架構側に設けられ、か
つ、該インペラーに接近及び退避可能な構造であり、さ
らに、インペラーの先端にブレーカーなどの振動あるい
は打撃機能を備えたことを特徴とするＫＲインペラー付
着物除去装置。The present invention is intended to solve the above-mentioned problems, and its gist is as follows. (1) A device for removing deposits of an impeller in a KR facility equipped with an impeller having a lifting function, the structure being provided on a frame side that does not synchronize with the movement of the impeller, and capable of approaching and retracting from the impeller The KR impeller adhered matter removing device is characterized in that the tip of the impeller is further provided with a vibration or striking function such as a breaker.
【０００７】（２）ＫＲインペラーの回転機能あるいは
昇降機能を利用し、前記（１）記載のKRインペラー付着
物除去装置の位置に付着物を除去したいインペラーの位
置をあわせ、インペラーの付着物を除去することを特徴
とするＫＲインペラー付着物除去方法。
（３）ＫＲ処理する溶湯鍋等の容器をインペラー下に配
置し、除去された付着物を容器内に回収することを特徴
とする前記（２）記載のＫＲインペラー付着物除去方法
である。(2) Using the rotating function or the lifting function of the KR impeller, align the position of the impeller to remove the deposit with the position of the KR impeller deposit removing device described in (1) above, and remove the deposit of the impeller. A method for removing deposits of KR impeller, comprising: (3) The method of removing KR impeller deposits according to (2) above, wherein a container such as a molten metal pot for KR treatment is placed under the impeller, and the removed deposits are collected in the container.
【０００８】[0008]
【発明実施の形態】以下、本発明を図面に従って詳細に
説明する。図１は、ＫＲ設備の溶銑撹拌に用いられる攪
拌用インペラー１を示す。溶湯の撹拌はインペラーの回
転によって行われるが、使用回数が進むにつれ羽根部の
溶損や地金等の付着により脱硫効率低下を招き交換を行
う必要がある。また、図２は、インペラーへの地金等の
付着状況を示す図である。この図に示すように、ＫＲ処
理時にスラグライン付近に当たるインペラー胴部への付
着物１ａ、インペラー羽部上部への付着物１ｂ、および
インペラー羽部周囲への付着物１ｃ、インペラー羽根底
部への付着物１ｄが代表的な付着物位置を示し、それら
が複合して発生し、それぞれが繋がる場合も多々ある。
地金等の付着は、撹拌トルクへの影響や脱硫剤の巻き込
み不良を招き、脱硫反応低下へとつながり、インペラー
の寿命を短くし、最終的には交換となる。DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 1 shows a stirring impeller 1 used for stirring hot metal in a KR facility. The molten metal is agitated by the rotation of the impeller, but as the number of times of use progresses, the desulfurization efficiency is lowered due to the melting damage of the blade portion and the adhesion of metal, etc., and it is necessary to replace it. Further, FIG. 2 is a diagram showing a state of attachment of metal and the like to the impeller. As shown in this figure, during the KR treatment, deposits 1a on the impeller body that hit the vicinity of the slag line, deposits 1b on the upper part of the impeller blades, and deposits 1c on the periphery of the impeller blades, and deposits on the bottom of the impeller blades. There are many cases where the kimono 1d shows a typical position of the adhering matter, and these are combined and generated, and are connected to each other.
The adherence of the metal or the like causes an influence on the stirring torque and a defective inclusion of the desulfurization agent, which leads to a decrease in the desulfurization reaction, shortens the life of the impeller, and eventually replaces it.
【０００９】図３は、ＫＲ設備の全体概略図を示す。撹
拌用インペラー１は、ＫＲ設備架構７内のインペラー昇
降台車３に設置されているインペラー駆動用モーター２
に連結され回転できるようになっている。また、インペ
ラー昇降台車によりインペラーは昇降することができ
る。ＫＲ処理を行う場合には、溶銑・溶鋼鍋等容器４を
台車等によりＫＲ架構内インペラー直下に引き込み、イ
ンペラーを降下させて溶湯に浸漬し、脱硫剤を投入して
インペラーを回転させ脱硫反応を行う。溶銑・溶鋼鍋等
容器４のインペラー直下への移動に当たってはＫＲ設備
側が自走しても良い。符号、５はインペラー仮置き台車
であり、６は集塵フードである。FIG. 3 shows an overall schematic diagram of the KR equipment. The stirring impeller 1 is an impeller drive motor 2 installed on an impeller lift truck 3 in the KR facility frame 7.
It is connected to and can be rotated. Further, the impeller can be moved up and down by the impeller lift truck. When carrying out the KR treatment, the container 4 such as hot metal and molten steel ladle is drawn directly under the KR frame impeller by a trolley, etc., the impeller is lowered and immersed in the molten metal, and a desulfurizing agent is added to rotate the impeller to carry out the desulfurization reaction. To do. When moving the container 4 such as the hot metal and molten steel pot directly below the impeller, the KR facility side may be self-propelled. Reference numeral 5 is an impeller temporary placement trolley, and 6 is a dust collecting hood.
【００１０】図４は、インペラー交換時インペラーを駆
動源より切り離した状態を示す図である。インペラー仮
置き台車５をインペラー直下に引き込み、インペラーを
下降させ、インペラー自重を仮置き台車にあずけ、モー
ター側との連結を切り離した上で、再度仮置き台車を移
動させ、インペラーを運び出す。また、逆の動作により
新しいインペラーの取り込み及び取り付けを行う。この
ようにインペラー交換は多工程の作業を行わなければな
らず、時間を要するため、設備稼動率の低下となる。ま
た、インペラー底部に付着物がある場合、仮置き台車５
にインペラー１を置くときに不安定となり、事前にある
程度付着物を除去する必要があり、さらにＫＲ設備の休
止時間が増長する。FIG. 4 is a view showing a state in which the impeller is separated from the drive source when the impeller is replaced. The temporary impeller temporary trolley 5 is drawn right under the impeller, the impeller is lowered, the impeller's own weight is applied to the temporary trolley trolley, the connection with the motor side is disconnected, and the temporary trolley trolley is moved again to carry out the impeller. In addition, the reverse operation takes in and installs a new impeller. As described above, the replacement of the impeller requires a multi-step work, and it takes time, so that the facility operation rate is reduced. In addition, if there is a deposit on the bottom of the impeller, the temporary storage cart 5
It becomes unstable when the impeller 1 is placed on the surface, it is necessary to remove deposits to some extent in advance, and the downtime of the KR equipment is further increased.
【００１１】本発明は、ＫＲ設備が有している機能を利
用し簡便な設備を用いてオンラインでインペラーを外す
ことなく付着物を除去する方法を提供するものである。
図５は、ＫＲ設備架構内に付着物除去装置を設置した図
である。図２の１ａ〜１ｄに示されているインペラーの
付着物を付着物除去装置８の除去高さにインペラー昇降
機能により位置を合わせることのできる高さに除去装置
を設置する。The present invention provides a method for removing deposits by utilizing the functions of the KR equipment and using a simple equipment online without removing the impeller.
FIG. 5 is a diagram in which the deposit removing device is installed in the KR facility frame. The removing device is installed at a height at which the deposits of the impeller shown in FIGS. 1a to 1d can be aligned with the removal height of the deposit removing device 8 by the impeller lifting function.
【００１２】付着物除去作業においては、除去したい付
着物の位置合わせをインペラーの昇降と回転により行
う。このことにより、除去装置はインペラーの昇降及び
回転に障害とならない位置への退避機能と除去を行うブ
レーカー機能などを最低限有すればよく、簡便な設備構
成でインペラーを取り外すことなくオンラインで付着物
の除去作業を行うことができる。また、インペラー直下
にＫＲ処理する溶湯鍋等の容器を配置し、除去された付
着物を容器内に回収すれば、清掃時間等が必要なくな
り、より設備の休止時間を短縮できる。In the deposit removal work, the deposits to be removed are aligned by raising and lowering and rotating the impeller. As a result, the removal device should have at least a retracting function to a position that does not hinder the lifting and rotation of the impeller and a breaker function that removes the impeller.With a simple equipment configuration, the adhered material can be attached online without removing the impeller. Can be removed. Further, if a container such as a molten metal pot for KR treatment is arranged immediately below the impeller and the removed deposits are collected in the container, cleaning time and the like are not required and the downtime of the equipment can be further shortened.
【００１３】[0013]
【実施例】実機にて本発明を適用した。インペラーの昇
降台車稼動範囲３０００ｍｍ角から退避できるように１
６００ｍｍストロークの水平スライド機能を有する台車
に打撃数５００ｂｐｍ程度の油圧ブレーカーをマウント
し、インペラーの昇降と回転機能で位置合わせを行い、
ＫＲ処理後の熱間状態で付着物を除去を行うことができ
た。その際、インペラー直下は開口となっており、下に
配置された溶銑鍋内に除去された付着物は落下し、問題
なく付着物を回収することができた。EXAMPLE The present invention was applied to an actual machine. To be able to evacuate from the 3000 mm square of the lift truck operating range of the impeller 1
Mount a hydraulic breaker with a striking number of about 500 bpm on a bogie with a horizontal slide function of 600 mm stroke, perform positioning by lifting and rotating the impeller,
It was possible to remove the deposit in the hot state after the KR treatment. At that time, an opening was provided directly below the impeller, and the removed deposits fell into the hot metal ladle disposed below, and the deposits could be collected without any problem.
【００１４】[0014]
【発明の効果】従来は、インペラーの溶損のほかに付着
物による脱硫効率の低下によってインペラーの交換を行
っていたが、ＫＲ処理間の時間を利用しオンラインで付
着物を除去する事によって、インペラーの交換を行う必
要がなくなり、稼動率を向上させることができた。ま
た、インペラーの付着物原因による交換をなくす事がで
き、修繕費を削減する事ができた。EFFECTS OF THE INVENTION Conventionally, the impeller was replaced by a decrease in desulfurization efficiency due to deposits in addition to the melting damage of the impeller, but by removing the deposits online by utilizing the time between KR treatments, It was not necessary to replace the impeller, and the operating rate could be improved. In addition, it was possible to eliminate the replacement due to the cause of the impeller deposits, and it was possible to reduce repair costs.
【図１】ＫＲ設備の溶銑撹拌に用いられる攪拌用インペ
ラーを示す図である。FIG. 1 is a view showing a stirring impeller used for stirring hot metal in a KR facility.
【図２】インペラーへの地金等の付着状況を示す図であ
る。FIG. 2 is a diagram showing a state of adhesion of metal or the like to an impeller.
【図３】ＫＲ設備の全体概略図である。FIG. 3 is an overall schematic diagram of KR equipment.
【図４】インペラー交換時、インペラーを駆動源より切
り離した状態の図である。FIG. 4 is a diagram showing a state in which the impeller is separated from a drive source when the impeller is replaced.
【図５】ＫＲ設備架構内に付着物除去装置を設置した図
である。FIG. 5 is a diagram in which an adhering matter removing device is installed in a KR facility frame.
１ 撹拌用インペラー １ａ インペラー胴部への付着物 １ｂ インペラー羽根上部への付着物 １ｃ インペラー羽部周囲への付着物 １ｄ インペラー羽根底部への付着物 ２ インペラー駆動用モーター ３ インペラー昇降台車 ４ 溶銑・溶鋼鍋等容器 ５ インペラー仮置き台車 ６ 集塵フード ７ ＫＲ設備架構 ８ 付着物除去装置 1 stirring impeller 1a Deposits on the body of the impeller 1b Adhered matter on top of impeller blade 1c Impeller attached around the impeller blade 1d Impeller blade bottom 2 Impeller drive motor 3 Impeller lift truck 4 Containers such as hot metal and molten steel ladle 5 Impeller temporary storage cart 6 Dust collecting hood 7 KR facility frame 8 Adhesion remover
Claims (3)
Ｒ設備におけるインペラーの付着物を除去する装置であ
って、該インペラーの動きと同調しない架構側に設けら
れ、かつ、該インペラーに接近及び退避可能な構造であ
り、さらに、インペラーの先端にブレーカーなどの振動
あるいは打撃機能を備えたことを特徴とするＫＲインペ
ラー付着物除去装置。1. A K provided with an impeller having a lifting function.
A device for removing deposits of an impeller in R equipment, which is provided on a frame side that does not synchronize with the movement of the impeller, and has a structure capable of approaching and retracting from the impeller, and a breaker or the like at the tip of the impeller. KR impeller adhered matter removing device having a vibration or impact function.
機能を利用し、請求項１記載のＫＲインペラー付着物除
去装置の位置に付着物を除去したいインペラーの位置を
あわせ、インペラーの付着物を除去することを特徴とす
るＫＲインペラー付着物除去方法。2. A rotary function or a lifting function of the KR impeller is utilized to align the position of the KR impeller deposit removing device according to claim 1 with the position of the impeller from which the deposit is to be removed, and remove the deposit on the impeller. A method for removing deposits of KR impeller, characterized by:
ー下に配置し、除去された付着物を容器内に回収するこ
とを特徴とする請求項２記載のＫＲインペラー付着物除
去方法。3. The KR impeller deposit removal method according to claim 2, wherein a container such as a molten metal pot for KR treatment is placed under the impeller, and the removed deposit is collected in the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001363756A JP3643553B2 (en) | 2001-11-29 | 2001-11-29 | KR impeller deposit removing apparatus and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001363756A JP3643553B2 (en) | 2001-11-29 | 2001-11-29 | KR impeller deposit removing apparatus and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003166010A true JP2003166010A (en) | 2003-06-13 |
| JP3643553B2 JP3643553B2 (en) | 2005-04-27 |
Family
ID=19174051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001363756A Expired - Fee Related JP3643553B2 (en) | 2001-11-29 | 2001-11-29 | KR impeller deposit removing apparatus and method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3643553B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7910176B2 (en) | 2003-06-05 | 2011-03-22 | Mitsubishi Denki Kabushiki Kaisha | Electrode for discharge surface treatment, manufacturing method and evaluation method for electrode for discharge surface treatment, discharge surface treatment apparatus, and discharge surface treatment method |
| CN102712960A (en) * | 2010-01-07 | 2012-10-03 | 日新制钢株式会社 | Operation method for mechanically stirring chrome-containing molten iron |
| WO2014045710A1 (en) * | 2012-09-21 | 2014-03-27 | 日新製鋼株式会社 | Metal recovery method |
| CN109280746A (en) * | 2018-11-30 | 2019-01-29 | 鞍钢集团工程技术有限公司 | A kind of dynamic control method of KR desulfurization stirring |
| KR101977360B1 (en) * | 2017-11-06 | 2019-05-10 | 주식회사 포스코 | Apparatus and Method for Removing attachment |
| KR20210073118A (en) * | 2019-12-10 | 2021-06-18 | 주식회사 포스코 | Control system for desulfurization apparatus of molten iron and control method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101137439B1 (en) | 2011-09-09 | 2012-04-20 | 김호천 | Impeller of lump steel removing device |
| CN102676741A (en) * | 2012-05-29 | 2012-09-19 | 中天钢铁集团有限公司 | KR (knotted reactor) powder spraying, stirring and desulfurizing device and method |
| CN111321265A (en) * | 2020-03-06 | 2020-06-23 | 大峘集团有限公司 | Automatic slag throwing method for KR-method desulfurization steelmaking stirring paddle |
-
2001
- 2001-11-29 JP JP2001363756A patent/JP3643553B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7910176B2 (en) | 2003-06-05 | 2011-03-22 | Mitsubishi Denki Kabushiki Kaisha | Electrode for discharge surface treatment, manufacturing method and evaluation method for electrode for discharge surface treatment, discharge surface treatment apparatus, and discharge surface treatment method |
| CN102712960A (en) * | 2010-01-07 | 2012-10-03 | 日新制钢株式会社 | Operation method for mechanically stirring chrome-containing molten iron |
| US8753423B2 (en) | 2010-01-07 | 2014-06-17 | Nisshin Steel Co., Ltd. | Operation method for mechanically stirring chrome-containing molten iron |
| WO2014045710A1 (en) * | 2012-09-21 | 2014-03-27 | 日新製鋼株式会社 | Metal recovery method |
| JP2014062298A (en) * | 2012-09-21 | 2014-04-10 | Nisshin Steel Co Ltd | Method for recovering bare metal |
| CN104704132A (en) * | 2012-09-21 | 2015-06-10 | 日新制钢株式会社 | Metal recovery method |
| US9663838B2 (en) | 2012-09-21 | 2017-05-30 | Nisshin Steel Co., Ltd. | Metal recovery method |
| TWI593805B (en) * | 2012-09-21 | 2017-08-01 | 日新製鋼股份有限公司 | Method for recovering scull |
| KR101977360B1 (en) * | 2017-11-06 | 2019-05-10 | 주식회사 포스코 | Apparatus and Method for Removing attachment |
| CN109280746A (en) * | 2018-11-30 | 2019-01-29 | 鞍钢集团工程技术有限公司 | A kind of dynamic control method of KR desulfurization stirring |
| KR20210073118A (en) * | 2019-12-10 | 2021-06-18 | 주식회사 포스코 | Control system for desulfurization apparatus of molten iron and control method thereof |
| KR102268910B1 (en) * | 2019-12-10 | 2021-06-25 | 주식회사 포스코 | Control system for desulfurization apparatus of molten iron and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3643553B2 (en) | 2005-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211866591U (en) | Movable ladle hot repair equipment | |
| JP2003166010A (en) | Device and method for removing deposit on kr impeller | |
| JPH0442453B2 (en) | ||
| JPH0243805B2 (en) | ||
| CA1297273C (en) | Treatment of refractory linings | |
| US4599967A (en) | Vessel nozzle cleaning apparatus and methods | |
| JPH0810938A (en) | Device for removing adhering matter to ladle | |
| CN113182509B (en) | Ladle slag removal device and ladle slag removal method | |
| JP2005002369A (en) | Apparatus for refining molten steel | |
| JPH09314316A (en) | Method for removing stuck material in molten steel ladle | |
| JP5164750B2 (en) | Casting anode removal device and casting anode removal method | |
| JP3435429B2 (en) | Furnace slag removal equipment | |
| JP2568395Y2 (en) | Eccentric hearth tapping removal device for electric furnace | |
| JP3568469B2 (en) | Aluminum dross processing equipment | |
| EP2899284B1 (en) | Metal recovery method | |
| CN213680774U (en) | Quick environmental protection fettling equipment of converter | |
| CN214443053U (en) | Automatic slag dragging device for molten aluminum in casting ladle | |
| JP4078834B2 (en) | Impeller for desulfurization device, its replacement device and impeller replacement method | |
| JPH03202420A (en) | Skimmer for molten steel suction pipe of vacuum degassing equipment | |
| JPH059753U (en) | Noro bullion removal device for molten steel ladle slag line | |
| JPH09209029A (en) | Device for repairing immersion tube and circulating tube in rh vacuum degassing apparatus | |
| JP2006097078A (en) | Method for removing slag | |
| JPH0381062A (en) | Scraper apparatus for ladle for pre-treating molten iron | |
| JPH0564698U (en) | Desmelting equipment for melting furnace | |
| JPH0119040Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20041116 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20041124 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20041224 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20050125 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20050128 |
|
| R151 | Written notification of patent or utility model registration |
Ref document number: 3643553 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R151 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080204 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090204 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090204 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100204 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100204 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110204 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110204 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120204 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120204 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130204 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130204 Year of fee payment: 8 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130204 Year of fee payment: 8 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130204 Year of fee payment: 8 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130204 Year of fee payment: 8 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140204 Year of fee payment: 9 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |