公开(公告)号：US10051694B2

公开(公告)日：2018-08-14

申请号：US14512807

申请日：2014-10-13

申请人： SGL Carbon SE

发明人： Billy Bryant

IPC分类号： H05B7/156 ,  H05B7/148 ,  C21C5/52 ,  F27B3/28 ,  G05B13/02

摘要： An electric arc furnace (EAF) including a set of mast hydraulics, a current transformer, a voltage transformer, a legacy control system and a set-point modifier. The legacy control system is in control of the set of mast hydraulics of the EAF, and receives information from the current transformer relative to current being supplied to the EAF and from the voltage transformer relative to voltage being applied to the EAF. The legacy control system using a set of set-points for the control of the set of mast hydraulics, the voltage and the current of the EAF. The set-point modifier communicates with the legacy control system, and executes the steps of: evaluating a cost function of key performance indicators of a previous heat of the EAF, the key performance indicators including electrical energy use and/or electrode consumption; and altering the set of set-points dependent upon the cost function.

公开(公告)号：US5375053A

公开(公告)日：1994-12-20

申请号：US117070

申请日：1993-10-08

申请人： Jaan Jarvik ,  Kuno Janson

发明人： Jaan Jarvik ,  Kuno Janson

IPC分类号： B23K9/073 ,  G05F1/02 ,  H02M1/14 ,  H02M7/04 ,  H02M7/08 ,  H02M9/00 ,  H05B7/144 ,  H05B7/156 ,  H02M7/06

CPC分类号： H05B7/156 ,  H02M1/14 ,  H02M7/08 ,  Y02P10/256 ,  Y02P10/259

摘要： A controlled power supply in which an electric arc is used as a loading element. A single phase ac-to-dc invertor is provided with a matching transformer and a main rectifier and diodes which form the bridge and are connected to the matching transformer. The invertor has a controllable output. The bridge has a diagonal corresponding to an output of the rectifier and electrodes between which an electric arc can be initiated. a circuit for controlling the voltage across the electrodes includes a comparator to compare an actual rectified voltage with a reference value. The comparator provides for changing positions of the electrodes relative to each other. The single-phase ac-to-dc invertor is provided with two phase-shifting circuits that are connected in series and to the matching transformer. One of these phase-shifting circuits is a choke, whereas the other phase-shifting circuit is a capacitor. Each phase-shifting circuit is connected to a corresponding input of the main rectifier. The phase-shifting circuits are connected to an output of the main rectifier in the same polarity with diodes of the main rectifier connected to the electrodes.

摘要翻译： PCT No.PCT / EP93 / 00023 Sec。 371日期：1993年10月8日 102（e）日期1993年10月8日PCT 1993年1月8日PCT公布。 公开号WO93 / 14557 日期：1993年7月22日。其中使用电弧作为加载元件的受控电源。 单相交直流逆变器配备有匹配的变压器和主整流器以及形成桥并连接到匹配变压器的二极管。 逆变器具有可控输出。 该桥具有对应于整流器的输出的对角线和可以启动电弧的电极。 用于控制电极两端的电压的电路包括比较器，用于将实际整流电压与参考值进行比较。 比较器提供电极相对于彼此改变的位置。 单相交直流逆变器配有两个串联连接到匹配变压器的移相电路。 这些移相电路中的一个是扼流圈，而另一个移相电路是电容器。 每个移相电路连接到主整流器的相应输入端。 移相电路以与主电极连接的电极的二极管相同的极性连接到主整流器的输出端。

公开(公告)号：US5255285A

公开(公告)日：1993-10-19

申请号：US801012

申请日：1991-12-02

申请人： Heinrich Aberl ,  Franz Rubenzucker

发明人： Heinrich Aberl ,  Franz Rubenzucker

IPC分类号： F27B3/08 ,  F27B3/28 ,  F27D1/00 ,  F27D11/08 ,  F27D19/00 ,  F27D99/00 ,  H05B7/156 ,  H05B7/148

CPC分类号： F27B3/085 ,  F27D19/00 ,  H05B7/156 ,  F27D2001/0066 ,  F27D2019/0037 ,  F27D2099/0021 ,  Y02P10/256 ,  Y02P10/259

摘要： A feedback control system for the impedance control of an electric arc furnace having at least one electrode, a hydraulic electrode actuator for adjusting the electrode. The actuator is adapted to be supplied with hydraulic fluid through a control valve. The furnace further includes a controller, which is connected to the valve actuator for the control valve, and impedance signal generator for delivering impedance signals to one input of the controller and a setpoint signal generator for delivering a setpoint signal representing a desired impedance to another input of the controller. In order to prevent non-permissible electrode oscillations in such a feedback control system it is proposed to provide a correcting stage for correcting the controller gain and to provide a correcting signal generator for delivering to the correcting stage a signal which represents the controlled-system gain and which causes the correcting stage to change the controller gain in a sense which is opposite to a detected change of the controlled-system gain.

摘要翻译： 一种用于具有至少一个电极的电弧炉的阻抗控制的反馈控制系统，用于调节电极的液压电极致动器。 致动器适于通过控制阀提供液压流体。 该炉还包括连接到用于控制阀的阀致动器的控制器和用于将阻抗信号传递到控制器的一个输入端的阻抗信号发生器和用于将表示期望阻抗的设定点信号传送到另一输入端的设定点信号发生器 的控制器。 为了防止这种反馈控制系统中的不允许的电极振荡，提出了提供用于校正控制器增益的校正级，并提供校正信号发生器，用于将表示受控系统增益的信号传送到校正级 并且这导致校正级在与检测到的受控系统增益的变化相反的意义上改变控制器增益。

公开(公告)号：US4292460A

公开(公告)日：1981-09-29

申请号：US42339

申请日：1979-05-25

申请人： Jury F. Frolov ,  Nariman A. Sukoian ,  Ivan T. Proshkin ,  Anany M. Basalaev

发明人： Jury F. Frolov ,  Nariman A. Sukoian ,  Ivan T. Proshkin ,  Anany M. Basalaev

IPC分类号： H05B7/109 ,  H05B7/148 ,  H05B7/156 ,  H05B7/10

CPC分类号： H05B7/156 ,  Y02P10/256 ,  Y02P10/259

摘要： An electrode-slipping apparatus for electric furnaces comprises an electrode, a hydraulic hoist with electrode-slipping hydraulic mechanisms mounted thereon, a locking ring, contact shoes with a clamp and hydraulic clamping mechanisms, a locking ring control valve, a slide valve for controlling the electrode-slipping hydraulic mechanisms, a hydraulic fluid pressure control unit and a programming unit. According to the invention, there is provided between the electrode-slipping mechanisms and the slide valve in the hydraulic fluid pressure and drain line a sliding spool flow control valve for continuously effecting the meter-out flow control in the electrode-slipping hydraulic mechanisms coupled to the programming unit.

摘要翻译： 用于电炉的电极滑动装置包括电极，其上安装有电极滑动液压机构的液压起重机，锁定环，具有夹具的接触鞋和液压夹紧机构，锁定环控制阀，用于控制 电极滑动液压机构，液压流体压力控制单元和编程单元。 根据本发明，在液压流体压力和排出管线中的电极滑动机构和滑阀之间设置有滑动阀芯流量控制阀，用于连续地实现电极滑动液压机构中的流出流量控制， 编程单元。

公开(公告)号：US3617595A

公开(公告)日：1971-11-02

申请号：US3617595D

申请日：1970-09-17

申请人： LAKE ONTARIO STEEL CO LTD

发明人： MULCAHY JOSEPH ALOYSIUS

IPC分类号： H05B7/156 ,  F27D11/10

CPC分类号： H05B7/156 ,  Y02P10/256 ,  Y02P10/259

摘要： A method and apparatus for regulating the arc of an electrode in an electric arc melting furnace, in which the voltage drop across the bus bar feeding the electrode is transformed into a comparator signal which is used to regulate the vertical position of the electrode in the furnace to bring the comparator signal to a predetermined value.

公开(公告)号：US2864339A

公开(公告)日：1958-12-16

申请号：US64280157

申请日：1957-02-27

申请人： GPE CONTROLS INC

发明人： SAZAVSKY JAROMIR K

IPC分类号： H05B7/156

CPC分类号： H05B7/156 ,  Y02P10/256 ,  Y02P10/259 ,  Y10T137/2322 ,  Y10T137/2409

公开(公告)号：US2201483A

公开(公告)日：1940-05-21

申请号：US20766338

申请日：1938-05-13

申请人： ASEA AB

发明人： TORSTEN EKLUND

IPC分类号： H05B7/156

CPC分类号： H05B7/156 ,  Y02P10/256 ,  Y02P10/259

公开(公告)号：US1646048A

公开(公告)日：1927-10-18

申请号：US2485925

申请日：1925-04-21

申请人： BBC BROWN BOVERI & CIE

发明人： ERNST WIRZ

IPC分类号： H05B7/156

CPC分类号： H05B7/156 ,  Y02P10/256 ,  Y02P10/259 ,  Y10T137/8667

公开(公告)号：US5590152A

公开(公告)日：1996-12-31

申请号：US331555

申请日：1994-11-15

申请人： Shinobu Nakajima ,  Kunji Maebou

发明人： Shinobu Nakajima ,  Kunji Maebou

IPC分类号： C21B11/10 ,  C21C5/52 ,  F27B3/08 ,  F27D11/08 ,  F27D99/00 ,  H05B7/11 ,  H05B7/156

CPC分类号： H05B7/11 ,  C21B11/10 ,  C21C5/5229 ,  F27B3/085 ,  H05B7/156 ,  F27D2099/0023 ,  Y02P10/216 ,  Y02P10/256 ,  Y02P10/259

摘要： Two upper electrodes 16 and 17 are horizontally spaced apart from each other with a predetermined distance and vertically extend through a furnace roof 3 of a furnace shell 2. Upper conductors 20 and 21 are connected to the upper electrodes 16 and 17 and extend in a direction away from the upper electrodes 17 and 16, respectively. Two lower conductors 22 and 23 are connected to a lower electrode 1 and extend in directions along which the upper conductors 20 and 21, respectively. Power source circuits 24 and 25 are arranged between extension ends of the upper and lower conductors 20 and 22 and 21 and 23, respectively. Arcs 12a and 12b generated between the upper electrodes 16 and 17 and the lower electrode 1 are directed to a center of the furnace shell 2.

摘要翻译： PCT No.PCT / JP94 / 00616 Sec。 371日期：1994年11月15日 102（e）1994年11月15日日期PCT 1994年4月14日PCT PCT。 WO94 / 24504 PCT公开号 日期1994年10月27日两个上部电极16和17以预定距离彼此水平间隔开，并垂直延伸穿过炉壳2的炉顶3.上部导体20和21连接到上部电极16和17 并且分别沿远离上电极17和16的方向延伸。 两个下导体22和23分别连接到下电极1并沿着上导体20和21的方向延伸。 电源电路24和25分别布置在上导体20和下导体22和21和23之间的延伸端之间。 在上部电极16,17和下部电极1之间产生的电弧12a和12b被引导到炉壳2的中心。

公开(公告)号：US5533044A

公开(公告)日：1996-07-02

申请号：US365958

申请日：1994-12-29

申请人： Eduard Strebel

发明人： Eduard Strebel

IPC分类号： H05B7/148 ,  H05B7/156

CPC分类号： H05B7/156 ,  Y02P10/256 ,  Y02P10/259

摘要： DC arc furnaces have a current regulator for maintaining the current of an arc constant and an electrode regulator for affecting the position of an electrode of the arc furnace and thus the length of the are. Adjustment of the position of the electrode takes place by a hydraulic electrode adjustment device, which is controlled as a function of the difference between a predeterminable electrode regulator command variable signal and a voltage actual signal. The arc length is adjusted in such a way that a rectifier operates on the average with a deflection of, for example, 35.degree. el., independently of the secondary voltage of a furnace transformer and a set current set value. To be able to better protect the wall of the arc furnace and to better utilize the fed-in energy during operation with foaming slag, the arc length is automatically adapted to a slag height. The electrode regulator set value signal is calculated by a computer as a function of an arc field strength and a loudness signal which was detected by a loudness detector.

摘要翻译： 直流电弧炉具有用于保持电弧恒定的电流的电流调节器和用于影响电弧炉的电极的位置以及因此的长度的电极调节器。 通过液压电极调节装置来调节电极的位置，液压电极调节装置根据可预定的电极调节器命令可变信号和电压实际信号之间的差异来控制。 调整电弧长度，使得整流器平均工作，具有例如35度的偏转，独立于炉式变压器的次级电压和设定的电流设定值。 为了能够更好地保护电弧炉的壁并且在运行期间利用发泡炉渣更好地利用所馈入的能量，电弧长度自动适应炉渣高度。 电极调节器设定值信号由计算机根据电弧场强度和由响度检测器检测到的响度信号来计算。