JP6583614B2 - Electrode breakage prevention device for arc furnace - Google Patents

Electrode breakage prevention device for arc furnace Download PDF

Info

Publication number
JP6583614B2
JP6583614B2 JP2015096179A JP2015096179A JP6583614B2 JP 6583614 B2 JP6583614 B2 JP 6583614B2 JP 2015096179 A JP2015096179 A JP 2015096179A JP 2015096179 A JP2015096179 A JP 2015096179A JP 6583614 B2 JP6583614 B2 JP 6583614B2
Authority
JP
Japan
Prior art keywords
electrode
load
value
breakage
arc furnace
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.)
Active
Application number
JP2015096179A
Other languages
Japanese (ja)
Other versions
JP2016213072A (en
Inventor
保 野村
保 野村
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.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co Ltd
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 Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Priority to JP2015096179A priority Critical patent/JP6583614B2/en
Publication of JP2016213072A publication Critical patent/JP2016213072A/en
Application granted granted Critical
Publication of JP6583614B2 publication Critical patent/JP6583614B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Description

本発明はアーク炉の電極折損防止装置に関し、特に、誤動作を生じることなく確実に電極折損を防止できる電極折損防止装置に関するものである。   The present invention relates to an electrode breakage prevention device for an arc furnace, and more particularly to an electrode breakage prevention device that can reliably prevent electrode breakage without causing malfunction.

電極折損防止装置の一例が特許文献１に記載されており、この装置では、電極を昇降支持する電極支柱を操作するためのワイヤの荷重をロードセルで検出して、当該ロードセルの検出荷重が上限値および下限値のいずれかを越えた時に電極折損のおそれ有りとして電極の昇降を停止している。   An example of an electrode breakage prevention device is described in Patent Document 1, and in this device, a load of a wire for operating an electrode support for supporting an electrode to be raised and lowered is detected by a load cell, and the detected load of the load cell is an upper limit value. And when either of the lower limit values is exceeded, the raising / lowering of the electrode is stopped because there is a possibility of electrode breakage.

実開平７−８９９６Real Kaihei 7-8996

しかし、アーク炉に使用される黒鉛電極は操業中に次第に消耗してその重量が軽くなるため、比較的小さなワイヤ荷重の変動で下限値を越えてしまうことがあり、上記従来の装置では電極折損のおそれを誤検知してその都度電極昇降が中止させられるため操業効率が低下するという問題があった。   However, graphite electrodes used in arc furnaces gradually wear out during operation and lighten their weight, so the lower limit may be exceeded due to relatively small fluctuations in wire load. There is a problem that the operation efficiency is lowered because the raising and lowering of the electrode is stopped each time when the fear of the above is erroneously detected.

そこで、本発明はこのような課題を解決するもので、電極の消耗による誤検出を生じることなく、確実に電極折損のおそれを判定してこれを回避でき、操業効率の低下を招かないアーク炉の電極折損防止装置を提供することを目的とする。   Therefore, the present invention solves such a problem, and it is possible to reliably determine the risk of electrode breakage and avoid this without causing erroneous detection due to electrode wear, and an arc furnace that does not cause a decrease in operation efficiency. An object of the present invention is to provide an electrode breakage prevention device.

上記目的を達成するために、本第１発明では、電極昇降装置（４）によってアーク炉の炉体（１）内を昇降させられる消耗電極（３）と、消耗電極（３）およびこれと一体に昇降する電極昇降装置（４）の昇降部の荷重を検出する荷重検出手段（５）と、消耗電極（３）を所定位置へ上昇させたときに荷重検出手段（５）で検出された荷重値をリセットするリセット手段（６）と、リセットされた荷重値が所定値を越えて上方ないし下方へ変化した時に電極折損のおそれ有りとして電極昇降装置（４）による消耗電極（３）の下降を中止させる第１下降制限手段（６）と、消耗電極の長さを算出する算出手段（６）と、長さ算出値に応じて前記所定値の値を変更する変更手段（６）とを備える。 In order to achieve the above object, according to the first aspect of the present invention, a consumable electrode (3) that can be moved up and down in the furnace body (1) of an arc furnace by an electrode lifting device (4), a consumable electrode (3), and the same The load detection means (5) for detecting the load of the lifting / lowering part of the electrode lifting / lowering device (4) that moves up and down, and the load detected by the load detection means (5) when the consumable electrode (3) is raised to a predetermined position The reset means (6) for resetting the value, and the consumable electrode (3) is lowered by the electrode lifting / lowering device (4) as there is a risk of electrode breakage when the reset load value exceeds the predetermined value and changes upward or downward. First descending limiting means (6) for stopping, calculating means (6) for calculating the length of the consumable electrode, and changing means (6) for changing the value of the predetermined value according to the calculated length value. .

本第１発明においては、消耗電極への通電前に荷重値をリセットしておくから、黒鉛電極が操業中に次第に消耗してその重量が軽くなっても、その影響を受けることはなく、常に適正に電極折損のおそれを判定できる。これにより、無駄な電極昇降操作の中止が回避されて操業効率の低下が防止される。加えて、電極折損は消耗電極にモーメント力が作用する結果であることに鑑み、消耗電極の長さに応じて電極折損の判定のための所定値を変更することによって、無駄な電極昇降の中止が無くなり、操業効率をさらに向上させることができる。 In the first invention, since the load value is reset before energizing the consumable electrode, even if the graphite electrode is gradually consumed during operation and its weight is lightened, it is not affected, and is always The risk of electrode breakage can be determined appropriately. As a result, the useless lifting operation of the electrode is avoided and the reduction of the operation efficiency is prevented. In addition, in view of the fact that electrode breakage is the result of moment force acting on the consumable electrode, by changing the predetermined value for determining electrode breakage according to the length of the consumable electrode, it is possible to cancel useless electrode elevation. And the operational efficiency can be further improved.

本第２発明では、荷重検出手段（６）の検出範囲を、リセットされた荷重値に対して上方ないし下方へ予想される荷重変化範囲に対応させて設定する。   In the second invention, the detection range of the load detection means (6) is set in correspondence with the load change range expected upward or downward with respect to the reset load value.

本第２発明によれば、検出範囲を上記荷重変化範囲に対応させて設定したことにより、検出の分解能を上げることができ、電極折損のおそれをより確実に判定することができる。   According to the second aspect of the present invention, the detection range can be set to correspond to the load change range, so that the resolution of detection can be increased, and the possibility of electrode breakage can be more reliably determined.

本第３発明では、荷重検出手段（５）で検出された荷重の変化速度を算出する変化速度算出手段（６）と、算出された変化速度が他の所定値を越えて上方へ変化した時に電極折損のおそれ有りとして電極昇降装置（４）による消耗電極（３）の下降を中止させる第２下降制限手段（６）とをさらに備える。 In the third aspect of the invention , the change rate calculating means (6) for calculating the change rate of the load detected by the load detecting means (5), and when the calculated change rate exceeds the other predetermined value and changes upward. Second descent restriction means (6) is further provided for stopping the descent of the consumable electrode (3) by the electrode elevating device (4) as there is a possibility of electrode breakage.

本第３発明によれば、溶落した細かいスクラップが黒鉛電極に徐々に寄りかかることによって電極折損を生じることを有効に防止することができる。 According to the third aspect of the present invention , it is possible to effectively prevent breakage of the electrode due to the fine scrap that has fallen gradually leaning against the graphite electrode.

なお、上記カッコ内の符号は、後述する実施形態に記載の具体的手段との対応関係を一例として示すものである。   In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later as an example.

以上のように本発明のアーク炉の電極折損防止装置によれば、電極の消耗による誤検出を生じることなく、確実に電極折損のおそれを判定してこれを回避でき、操業効率の低下を招くことがない。   As described above, according to the electrode breakage prevention apparatus for an arc furnace of the present invention, it is possible to reliably determine the risk of electrode breakage and avoid this without causing erroneous detection due to electrode wear, resulting in a decrease in operation efficiency. There is nothing.

本発明の第１実施形態における、電極折損防止装置を付設したアーク炉の全体構成を示す図である。It is a figure which shows the whole arc furnace structure which attached the electrode breakage prevention apparatus in 1st Embodiment of this invention. 本発明の第２実施形態における、検出スパンの設定範囲を示す図である。It is a figure which shows the setting range of a detection span in 2nd Embodiment of this invention. 本発明の第５実施形態における、電極折損防止装置を付設したアーク炉の全体構成を示す図である。It is a figure which shows the whole arc furnace structure which attached the electrode breakage prevention apparatus in 5th Embodiment of this invention.

なお、以下に説明する実施形態はあくまで一例であり、本発明の要旨を逸脱しない範囲で当業者が行う種々の設計的改良も本発明の範囲に含まれる。   The embodiment described below is merely an example, and various design improvements made by those skilled in the art without departing from the gist of the present invention are also included in the scope of the present invention.

（第１実施形態）
図１には電極折損防止装置を備えたアーク炉の概略断面を示す。図において、アーク炉の炉体１内には、上方開口に覆着された蓋体２を貫通して消耗電極たる黒鉛電極３が挿入されており、その先端と炉体１の底部に装入されたスクラップＳとの間で放電が生じてスクラップＳが加熱溶融される。黒鉛電極３は三相交流アーク炉では複数設けられるが、他の黒鉛電極についても同様である。 (First embodiment)
FIG. 1 shows a schematic cross section of an arc furnace provided with an electrode breakage prevention device. In the figure, a graphite electrode 3 as a consumable electrode is inserted into a furnace body 1 of an arc furnace through a lid body 2 covered with an upper opening, and is inserted into the tip and the bottom of the furnace body 1. A discharge occurs between the scrap S and the scrap S is heated and melted. A plurality of graphite electrodes 3 are provided in a three-phase AC arc furnace, but the same applies to other graphite electrodes.

黒鉛電極３はその上端部外周が電極昇降装置４を構成する把持器４１によって把持され、把持器４１は水平に延びる支腕４２の一端に設けられている。支腕４２は中間部を、起立した支柱４３によって支持されており、この支柱４３には両側面にガイドローラ４３１が当接して、当該支柱４３の上下動を案内している。   The outer periphery of the graphite electrode 3 is gripped by a gripper 41 that constitutes the electrode lifting device 4, and the gripper 41 is provided at one end of a support arm 42 that extends horizontally. An intermediate portion of the support arm 42 is supported by an upright column 43, and guide rollers 431 are in contact with both sides of the column 43 to guide the vertical movement of the column 43.

支柱４３の下端に設けたプーリ４４１の下側外周にはワイヤ４５が懸架され、上方へ延びるワイヤ４５の一端は荷重検出手段たるロードセル５の一端に結合されている。ロードセル５の他端は固定側に結合されている。そして、ロードセル５から出力される荷重信号５ａが制御装置６に入力している。   A wire 45 is suspended on the lower outer periphery of the pulley 441 provided at the lower end of the column 43, and one end of the wire 45 extending upward is coupled to one end of the load cell 5 serving as load detecting means. The other end of the load cell 5 is coupled to the fixed side. A load signal 5 a output from the load cell 5 is input to the control device 6.

上記ワイヤ４５の上方へ延びる他端はアイドルプーリ４４２を経て下方へ向きを変えた後、昇降機構４６に設けられた巻取りドラム４６１に巻回されている。巻取りドラム４６１は昇降機構４６の駆動モータ４６２によって正逆回転駆動され、正転時にはワイヤ４５を巻き取って支柱４３（したがって黒鉛電極３）を上昇移動させ、逆転時にはワイヤ４５を繰り出して支柱４３（したがって黒鉛電極３）を下降移動させる。   The other end of the wire 45 extending upward is turned downward through an idle pulley 442 and then wound around a winding drum 461 provided in the lifting mechanism 46. The take-up drum 461 is driven to rotate forward and backward by a drive motor 462 of the elevating mechanism 46, winds up the wire 45 during forward rotation and moves up the support 43 (and hence the graphite electrode 3), and feeds out the wire 45 during reverse rotation and feeds the support Therefore, the graphite electrode 3 is moved downward.

駆動モータ４６２は制御装置６の出力によってその正逆転と停止が制御されている。制御装置６はロードセル５の荷重信号５ａを常時取り込んでいるが、黒鉛電極３が所定位置（通常は上限位置）へ上昇させられた際に荷重信号５ａの荷重値を内部でリセット（通常は零リセット）する。なお、上限位置は図略のリミットスイッチの作動を検出することで知ることができる。黒鉛電極３が上限位置へ上昇させられるのは通常は蓋体２が開放される操業開始時やスクラップＳの追装時で、この時は黒鉛電極３への通電は行われない。   The forward / reverse rotation and stop of the drive motor 462 are controlled by the output of the control device 6. The control device 6 always takes the load signal 5a of the load cell 5, but when the graphite electrode 3 is raised to a predetermined position (usually the upper limit position), the load value of the load signal 5a is internally reset (usually zero). Reset. The upper limit position can be known by detecting the operation of a limit switch (not shown). The graphite electrode 3 is usually raised to the upper limit position at the start of operation when the lid body 2 is opened or when the scrap S is added. At this time, the graphite electrode 3 is not energized.

黒鉛電極３への通電を開始する際には、制御装置６は、駆動モータ４６２によって黒鉛電極３を下降させ、その後は水冷ケーブル３１を介して黒鉛電極３に通電される電流と電圧を検出して、これらが所望の値になるように黒鉛電極３を適宜昇降させスクラップＳとの間の放電を制御してスクラップＳの加熱溶融を行う。   When starting energization of the graphite electrode 3, the control device 6 lowers the graphite electrode 3 by the drive motor 462, and then detects the current and voltage energized to the graphite electrode 3 via the water-cooled cable 31. Then, the graphite electrode 3 is moved up and down appropriately so that these become desired values, and the discharge between the scrap S and the scrap S is heated and melted.

この際、前回の通電時の消耗によって黒鉛電極３の重量が小さくなっていても、上述のように新たな通電の開始前にはロードセル５の荷重信号５ａの荷重値が零にリセットされるから、黒鉛電極３の消耗による荷重の絶対的な減少はキャンセルされている。   At this time, even if the weight of the graphite electrode 3 is reduced due to consumption during the previous energization, the load value of the load signal 5a of the load cell 5 is reset to zero before the start of new energization as described above. The absolute decrease of the load due to the consumption of the graphite electrode 3 is cancelled.

この状態で、黒鉛電極３が不導体のスクラップＳに乗り上げると、黒鉛電極３の荷重が見かけ上大きく減少し、ロードセル５で検出される荷重値が所定の下限値を越えて下方へ変化する。そこで、この場合は電極折損のおそれがあるとして上記電極３の下降を停止し、あるいは電極３を所定量引き上げて、電極折損を未然に防止する。   In this state, when the graphite electrode 3 rides on the non-conductive scrap S, the load on the graphite electrode 3 apparently decreases greatly, and the load value detected by the load cell 5 changes below a predetermined lower limit value. Therefore, in this case, it is assumed that there is a possibility of electrode breakage, so that the lowering of the electrode 3 is stopped or the electrode 3 is pulled up by a predetermined amount to prevent the electrode breakage.

また、溶落したスクラップＳが黒鉛電極３に寄りかかってロードセル５で検出される荷重値が所定の上限値を越えて上方へ変化した場合にも、電極折損のおそれがあるとして上記電極３の下降を停止し、あるいは電極３を所定量引き上げて、電極折損を未然に防止する。   Further, when the scrap S that has melted leans against the graphite electrode 3 and the load value detected by the load cell 5 changes upward beyond a predetermined upper limit value, it is considered that there is a risk of electrode breakage. The descent is stopped or the electrode 3 is pulled up by a predetermined amount to prevent electrode breakage.

なお、この場合にも通電によって黒鉛電極３は次第に消耗してその荷重（重量）が減少するが、この消耗による荷重減少は小さいから、リセットされた荷重値が上記下限値を越えて下方へ変化することはない。したがって、従来のように電極折損のおそれを誤検知して電極昇降が停止させられて、操業が妨げられるという不具合は生じない。   In this case as well, the graphite electrode 3 is gradually consumed by energization and its load (weight) is reduced. However, since the load decrease due to this consumption is small, the reset load value changes below the lower limit value. Never do. Therefore, unlike the conventional case, there is no problem that the risk of electrode breakage is erroneously detected and the electrode elevation is stopped and operation is hindered.

（第２実施形態）
上記第１実施形態において、ロードセル５の荷重信号５ａに対する制御装置６内の検出スパン（範囲）Ｘを、図２に示すように、リセットされた荷重値Ｒに対して上方ないし下方へ予想される荷重変化範囲Ａに対応させて設定し、この検出スパンＸ内に上記上限値および下限値をそれぞれ設定する。このようにすると、ロードセル５の荷重変化をより高い分解能で検出することができるから、確実な電極折損の防止を図ることができる。なお、図２のＹで示す検出スパンは従来のものであり、Ｅは風袋荷重値、Ｍはロードセル５の許容荷重値である。 (Second Embodiment)
In the first embodiment, the detected span (range) X in the control device 6 for the load signal 5a of the load cell 5 is predicted upward or downward with respect to the reset load value R as shown in FIG. It is set corresponding to the load change range A, and the upper limit value and the lower limit value are set in the detection span X, respectively. In this way, it is possible to detect the load change of the load cell 5 with higher resolution, and thus it is possible to reliably prevent the electrode from being broken. The detection span indicated by Y in FIG. 2 is conventional, E is the tare load value, and M is the allowable load value of the load cell 5.

（第３実施形態）
上記第１実施形態において、黒鉛電極３の折損は多くが把持器４１直下の電極接続部（黒鉛電極３は複数の電極を接続して構成されている）で生じており、これは棒状の黒鉛電極３が斜めのスクラップＳに乗り上げる等によって電極下端に水平力が作用し、黒鉛電極３の長さ（正確には電極下端から把持器４１直下の電極接続部までの長さ）に比例したモーメント力が上記電極接続部に加わるからである。 (Third embodiment)
In the first embodiment, most of the breakage of the graphite electrode 3 occurs at the electrode connection portion directly below the gripper 41 (the graphite electrode 3 is constituted by connecting a plurality of electrodes). A horizontal force acts on the lower end of the electrode, for example, when the electrode 3 rides on the slanted scrap S, and the moment proportional to the length of the graphite electrode 3 (exactly, the length from the lower end of the electrode to the electrode connecting portion directly below the gripper 41). This is because a force is applied to the electrode connecting portion.

黒鉛電極３の断面は一定であるから、リセット前のロードセル５で検出された荷重を、操業開始時の、長さの判明している時の検出荷重と比較すれば、その荷重差（重量差）より、消耗した分短くなった黒鉛電極３の長さを通電前に予想することができる。そこで、黒鉛電極３の長さが長い時は電極折損を防止するための上記上限値および下限値の値を黒鉛電極３の長さが短い時に比して上限値の値は相対的に小さく下限値の値は相対的に大きくし、黒鉛電極３の長さが短くなった時は上記上限値および下限値の値を黒鉛電極３の長さが長い時に比して上限値の値は相対的に大きく下限値の値は相対的に小さくする。このようにすれば、特に黒鉛電極３が短くなった時に電極折損防止のため電極昇降が徒らに止められることが無いから、操業効率がさらに改善される。 Since the cross section of the graphite electrode 3 is constant, if the load detected by the load cell 5 before resetting is compared with the detected load when the length is known at the start of operation, the load difference (weight difference) ), The length of the graphite electrode 3 that has become shorter as it is consumed can be predicted before energization. Therefore, when the length of the graphite electrode 3 is long, the upper limit value and the lower limit value for preventing electrode breakage are relatively smaller than the upper limit value when the length of the graphite electrode 3 is short. When the length of the graphite electrode 3 is shortened, the upper limit value and the lower limit value are compared with the upper limit value when the graphite electrode 3 is long. The lower limit value is relatively small and relatively small . In this way, the operation efficiency is further improved because the electrode elevation is not stopped in order to prevent electrode breakage especially when the graphite electrode 3 is shortened.

（第４実施形態）
上記第１実施形態において、電極折損の他の原因として、溶落した細かいスクラップＳが黒鉛電極３に徐々に寄りかかって当該電極３に荷重が加わることが考えられる。そこで、本実施形態では、制御装置６は、ロードセル５の検出荷重の変化速度が一定の上限値を超えて変化した時には電極折損のおそれがあるとして黒鉛電極３の下降を停止し、あるいは当該電極３を所定量引き上げて、電極折損を未然に防止する。 (Fourth embodiment)
In the first embodiment, as another cause of electrode breakage, it is conceivable that the fine scrap S that has been melted down gradually approaches the graphite electrode 3 and a load is applied to the electrode 3. Therefore, in the present embodiment, the control device 6 stops the descent of the graphite electrode 3 because there is a possibility of electrode breakage when the change speed of the detected load of the load cell 5 changes beyond a certain upper limit value, or the electrode 3 is pulled up by a predetermined amount to prevent electrode breakage.

（第５実施形態）
本発明の対象となるアーク炉は例えば図３に示すような構造のものでも良い。図３において、黒鉛電極３を昇降させる支柱４３は筒状に成形されており、その内部に油圧シリンダ７１が設置されて、当該油圧シリンダ７１によって支柱４３が上下に移動駆動されるようになっている。油圧シリンダ７１の作動は制御装置６の出力信号によって油圧機構７から油圧供給ライン７２を介して行われる。ロードセル５は油圧シリンダ７１とフロアの間に介設されている。他の構造は第１実施形態と同様であり、第１実施形態と同様の制御で電極折損が未然に防止される。 (Fifth embodiment)
The arc furnace which is the subject of the present invention may have a structure as shown in FIG. 3, for example. In FIG. 3, a support column 43 for raising and lowering the graphite electrode 3 is formed in a cylindrical shape, and a hydraulic cylinder 71 is installed therein, and the support column 43 is moved up and down by the hydraulic cylinder 71. Yes. The operation of the hydraulic cylinder 71 is performed from the hydraulic mechanism 7 via the hydraulic pressure supply line 72 by the output signal of the control device 6. The load cell 5 is interposed between the hydraulic cylinder 71 and the floor. The other structure is the same as that of the first embodiment, and electrode breakage is prevented by the same control as that of the first embodiment.

この場合、荷重検出手段として、ロードセル５に代えて、油圧供給ライン７２に圧力センサ７３を設けて、黒鉛電極３の荷重を圧力センサ７３の検出圧力から換算するようにしても良い。   In this case, as a load detection means, a pressure sensor 73 may be provided in the hydraulic pressure supply line 72 instead of the load cell 5, and the load of the graphite electrode 3 may be converted from the detected pressure of the pressure sensor 73.

１…炉体、３…消耗電極、４…電極昇降装置、５…ロードセル（荷重検出手段）、６…制御装置（リセット手段、第１下降制限手段、算出手段、変更手段、変化速度算出手段、第２下降制限手段）、７…油圧機構、７３…圧力センサ（荷重検出手段）。 DESCRIPTION OF SYMBOLS 1 ... Furnace body, 3 ... Consumable electrode, 4 ... Electrode raising / lowering device, 5 ... Load cell (load detection means), 6 ... Control apparatus (Reset means, 1st descent | fall limitation means, calculation means, change means, change speed calculation means, (Second descending limiting means), 7 ... hydraulic mechanism, 73 ... pressure sensor (load detecting means).

Claims (3)

電極昇降装置によってアーク炉の炉体内を昇降させられる消耗電極と、消耗電極およびこれと一体に昇降する電極昇降装置の昇降部の荷重を検出する荷重検出手段と、消耗電極を所定位置へ上昇させたときに荷重検出手段で検出された荷重値をリセットするリセット手段と、リセットされた荷重値が所定値を越えて上方ないし下方へ変化した時に電極折損のおそれ有りとして電極昇降装置による消耗電極の下降を中止させる第１下降制限手段と、前記消耗電極の長さを算出する算出手段と、長さ算出値に応じて前記所定値の値を変更する変更手段とを備えるアーク炉の電極折損防止装置。 A consumable electrode that can be moved up and down in the arc furnace by the electrode lifting device, a load detecting means for detecting the load of the consumable electrode and the lifting portion of the electrode lifting device that moves up and down integrally therewith, and the consumable electrode is lifted to a predetermined position Reset means for resetting the load value detected by the load detection means, and there is a risk of electrode breakage when the reset load value changes upward or downward beyond a predetermined value. Electrode breakage prevention of an arc furnace comprising: first descent restriction means for stopping descent; calculation means for calculating the length of the consumable electrode; and changing means for changing the value of the predetermined value in accordance with the calculated length value apparatus. 前記荷重検出手段の検出範囲を、リセットされた荷重値に対して上方ないし下方へ予想される荷重変化範囲に対応させて設定した請求項１に記載のアーク炉の電極折損防止装置。 The electrode breakage prevention device for an arc furnace according to claim 1, wherein a detection range of the load detection means is set in correspondence with a load change range expected upward or downward with respect to the reset load value. 前記荷重検出手段で検出された荷重の変化速度を算出する変化速度算出手段と、算出された変化速度が他の所定値を越えて上方へ変化した時に電極折損のおそれ有りとして前記電極昇降装置による前記消耗電極の下降を中止させる第２下降制限手段とをさらに備える請求項１又は２に記載のアーク炉の電極折損防止装置。 The change rate calculating means for calculating the rate of change of the load detected by the load detection means, and the electrode lifting / lowering device assuming that there is a possibility of electrode breakage when the calculated change rate exceeds the other predetermined value and changes upward. The apparatus for preventing breakage of an electrode in an arc furnace according to claim 1 or 2, further comprising: a second lowering restricting unit that stops the lowering of the consumable electrode.
JP2015096179A 2015-05-11 2015-05-11 Electrode breakage prevention device for arc furnace Active JP6583614B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015096179A JP6583614B2 (en) 2015-05-11 2015-05-11 Electrode breakage prevention device for arc furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2015096179A JP6583614B2 (en) 2015-05-11 2015-05-11 Electrode breakage prevention device for arc furnace

Publications (2)

Publication Number Publication Date
JP2016213072A JP2016213072A (en) 2016-12-15
JP6583614B2 true JP6583614B2 (en) 2019-10-02

Family

ID=57549771

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2015096179A Active JP6583614B2 (en) 2015-05-11 2015-05-11 Electrode breakage prevention device for arc furnace

Country Status (1)

Country Link
JP (1) JP6583614B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JOP20190073A1 (en) 2016-10-31 2019-04-07 Taiho Pharmaceutical Co Ltd Selective inhibitor of exon 20 insertion mutant egfr
US11701359B2 (en) 2017-09-01 2023-07-18 Taiho Pharmaceutical Co., Ltd. Exon 18 and/or exon 21 mutant EGFR selective inhibitor
CN114659373B (en) * 2022-03-22 2023-08-01 宁夏昌茂祥冶炼有限公司 Submerged arc furnace system with automatic lifting electrode and control method thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02110286A (en) * 1988-10-17 1990-04-23 Fuji Electric Co Ltd Measuring of length of electrode for ac arc furnace
JPH078996U (en) * 1993-06-30 1995-02-07 愛知製鋼株式会社 Electrode breakage prevention device for electric furnace
JP2005008332A (en) * 2003-06-18 2005-01-13 Nippon Sharyo Seizo Kaisha Ltd Wheelchair lift

Also Published As

Publication number Publication date
JP2016213072A (en) 2016-12-15

Similar Documents

Publication Publication Date Title
JP6583614B2 (en) Electrode breakage prevention device for arc furnace
KR102352549B1 (en) break detection device
US20150225218A1 (en) Method Of Operating A Fork-Lift Truck, Computer Program Product, And A Fork-Lift Truck
JP2009154989A (en) Counter clearance adjusting device for elevator
KR100938218B1 (en) The up and down safety device for batten of stage
JP2007039240A (en) Counter clearance measuring device of elevator and its measuring method
US3937869A (en) Force sensing control apparatus and method for electric arc furnaces
JP4872788B2 (en) Bobbin rail lifting device in roving machine
JP2016060550A (en) Life diagnosis method of elevator main rope
KR101379841B1 (en) Winch comprising apparatus of preventing wire rope from deserting
US20120279806A1 (en) Obstruction monitoring method and system for a vertical reciprocating conveyor
JP2014037305A (en) Apparatus and method for lubricating elevator rope
JP5969861B2 (en) Elevator landing detection control device and mechanical parking equipment equipped with the same
JP5558802B2 (en) Elevator control device
JP2016013909A (en) Control device for elevator
JP4898159B2 (en) Electrode lifting control device for arc furnace
US3914526A (en) Force sensing control apparatus and method for electric arc furnaces
KR20140000050U (en) Apparatus of crane preventing wire rope from overly winding down
JP2000118914A (en) Tensile force compensation device of main rope for elevator
JP5742400B2 (en) AC arc furnace electrode lifting device
JP5963623B2 (en) Arc furnace electrode lifting device
KR20100135114A (en) A overspeed governor for elevator
JP5822283B1 (en) Mast device and forklift equipped with the device
JP5686068B2 (en) Emergency lift device for converter exhaust gas treatment skirt
JP5093775B2 (en) elevator

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20180320

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20190122

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20190125

A601 Written request for extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A601

Effective date: 20190320

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20190513

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: 20190807

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20190820

R150 Certificate of patent or registration of utility model

Ref document number: 6583614

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150