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1. 发明授权

US3732351A Control system for arc voltage of a plasma arc torch 失效
标题翻译：等离子电弧炉的电弧控制系统
公开(公告)号：US3732351A
公开(公告)日：1973-05-08
申请号：US3732351D
申请日：1972-05-18
申请人： STEEL CORP
发明人： SCHULTZ R
IPC分类号： H05B7/00 , H05B7/148
CPC分类号： H05B7/005 , H05B7/00 , H05B7/148 , Y02P10/256 , Y02P10/259
摘要： A control system for the arc voltage drop in a furnace heated by a plasma arc torch has a voltage transducer providing a signal representative of the arc voltage drop. A function generator, based on the ionizing gas used, alters the signal to provide a constant loop gain. The altered signal is compared to a desired voltage drop and the resulting error signal is used to move the torch towards of away from the furnace.
摘要翻译：用于由等离子体电弧炬加热的炉中的电弧电压降的控制系统具有提供代表电弧电压降的信号的电压换能器。基于所使用的电离气体的函数发生器改变信号以提供恒定的环路增益。将改变的信号与期望的电压降进行比较，并且所得到的误差信号用于将焊枪移动远离炉。

2. 发明授权

US3830282A System for feedback control of casting speed 失效
标题翻译：铸造速度反馈控制系统
公开(公告)号：US3830282A
公开(公告)日：1974-08-20
申请号：US30246672
申请日：1972-10-31
申请人： STEEL CORP
发明人： SCHULTZ R
IPC分类号： B22D11/16 , B22D11/10
CPC分类号： B22D11/16
摘要： A string casting process with vacuum degassing uses vessel repressurization to provide uniform outflow of molten metal to a continuous-casting mold, a first operator initiated signal controls the pump-down of a degassing vessel, the admission of metal to the vessel at a desired pump-down pressure and the rate of degassing. When the degassing of each batch is complete, a second operator initiated signal controls the closing of a sliding gate valve to seal the vessel, the admission of repressurization gas into the vessel and the repressurization of the vessel to provide a uniform flow from the vessel by comparing the actual casting speed with a desired casting speed.
摘要翻译：具有真空脱气的线铸造方法使用容器再加压以将熔融金属均匀地流出到连续铸造模具中，第一操作者启动的信号控制脱气容器的抽空，在期望的泵处进入金属到容器降压和脱气速率。当每个批次的脱气完成时，第二操作者启动的信号控制滑动闸阀的关闭以密封容器，重新加压气体进入容器以及容器的再加压以通过将实际铸造速度与期望的铸造速度进行比较。

3. 发明授权

US3819840A Control system for torch current in a plasma arc furnace 失效
标题翻译：用于在等离子弧炉中转换电流的控制系统
公开(公告)号：US3819840A
公开(公告)日：1974-06-25
申请号：US25458672
申请日：1972-05-18
申请人： STEEL CORP
发明人： SCHULTZ R
IPC分类号： G05F1/147 , H05B7/00
CPC分类号： G05F1/147 , H05B7/00 , H05B7/005
摘要： A CONTROL SYSTEM FOR THE TORCH CURRENT OF A PLASMA ARC TORCH HAS A THERMAL CONVERTER PROVIDING A SIGNAL REPRESENTATIVE OF THE TORCH CURRENT. A FUNCTION GENERATOR, ABSED ON THE IONIZING GAS USED, ALTERS THE SIGNAL TO PROVIDE AN INVERSE TORCH CURRENT CHARACTERISTIC SIGNAL WHICH IS COMPARED TO A DESIRED INVERSE TORCH CHARACTERISTIC SIGNAL AND THE RESULTANT ERROR USED TO CONTROL GAS FLOW TO THE TORCH. WHEN GAS PRESSURE BECOMES TOO HIGH OR TOO LOW, A CONTROLLER ALTERS A REACTANCE IN THE SERIES WITH THE PRIMARY WINDING OF THE POWER SUPPLY TRANSFORMER TO CHANGE THE ELECTRODE VOLTAGE.

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