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公开(公告)号：US5189277A
公开(公告)日：1993-02-23
申请号：US682727
申请日：1991-04-08
CPC分类号： B23K10/006 , H05H1/36 , H05K5/0021
摘要： Plasma cutting apparatus (10) for use in cutting a material (M). A torch (12) cuts the material. A control unit (14) controls the cutting operation performed by the torch and includes a control module (16) in which the control unit is housed. At least one power unit (18) supplies power to the cutting torch, the application of this power being controlled by the control unit. Each power unit includes a power module (24) in which the power unit is housed. A cooling unit (54) for cooling the torch is also available. The cooling unit includes a cooling module (56). The control module, power module(s), and coolant module are removably stackable one on top of the other.
摘要翻译： 用于切割材料（M）的等离子切割装置（10）。 手电筒（12）切割材料。 控制单元（14）控制由割炬执行的切割操作，并且包括容纳控制单元的控制模块（16）。 至少一个动力单元（18）向割炬供电，该功率的应用由控制单元控制。 每个动力单元包括其中容纳动力单元的功率模块（24）。 也可以使用用于冷却割炬的冷却单元（54）。 冷却单元包括冷却模块（56）。 控制模块，电源模块和冷却剂模块可拆卸地叠放在一起。
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公开(公告)号：USRE37608E1
公开(公告)日：2002-03-26
申请号：US08352389
申请日：1994-12-08
申请人： Dennis J. Solley , David A. Tatham
发明人： Dennis J. Solley , David A. Tatham
IPC分类号： B23K900
CPC分类号： B23K10/006 , H05H1/36 , H05K5/0021
摘要： A plasma arc torch having new electronic circuit concepts wherein main current regulated power means regulates the pilot current prior to main arc transfer. Further, the circuit may contain two inductors to which DC current initially flows but is interrupted upon main arc transfer such that one inductor maintains the pilot arc while the current in the second inductor forces the establishment of the transferred arc. Also, advantages are presented in pulsing the cutting arc as well as pulsing the pilot arc.
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公开(公告)号：US5170030A
公开(公告)日：1992-12-08
申请号：US762852
申请日：1991-09-18
申请人： Dennis J. Solley , David A. Tatham
发明人： Dennis J. Solley , David A. Tatham
CPC分类号： B23K10/006 , H05H1/36
摘要： A plasma arc torch having new electronic circuit concepts wherein main current regulated power means regulates the pilot current prior to main arc transfer. Further, the circuit may contain two inductors to which DC current initially flows but is interrupted upon main arc transfer such that one inductor maintains the pilot arc while the current in the second inductor forces the establishment of the transferred arc. Also, advantages are presented in pulsing the cutting arc as well as pulsing the pilot arc.
摘要翻译： 具有新的电子电路概念的等离子弧焊炬，其中主电流调节功率装置在主电弧传输之前调节导频电流。 此外，电路可以包含两个电感器，DC电流最初流过该电感器，但是在主电弧转移时中断，使得一个电感器保持引导电弧，同时第二电感器中的电流迫使建立传输的电弧。 此外，在脉冲切割电弧以及脉冲导向电弧中呈现优点。
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公开(公告)号：US5990443A
公开(公告)日：1999-11-23
申请号：US41202
申请日：1998-03-12
摘要： A pilot arc circuit for a plasma torch establishes a pilot arc current in the channel between the torch electrode and torch tip at a first target level which is greater than a predetermined minimum current sufficient to maintain a stable pilot arc. After a period of time following pilot arc initiation, the pilot arc current is reduced to a second target level which is greater than or equal to the predetermined minimum current so that damage to the torch is reduced by minimizing wear on the parts. The pilot arc current is established and maintained as a function of a pilot arc reference signal. Pulsing the pilot arc current assists in main arc transfer and enhances pilot arc stability.
摘要翻译： 用于等离子体焰炬的先导电弧在第一目标水平下在炬电极和割炬尖之间的通道中建立一个先导电弧电流，该第一目标电平大于足以维持稳定导频电弧的预定最小电流。 在先导电弧启动之后的一段时间后，先导电弧电流减小到大于或等于预定最小电流的第二目标电平，从而通过最小化部件上的磨损来减少割炬的损坏。 作为导频电弧参考信号的函数，建立和维持导频电弧电流。 脉冲导电电弧有助于主电弧转移，提高了先导电弧的稳定性。
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公开(公告)号：US06670572B2
公开(公告)日：2003-12-30
申请号：US10090212
申请日：2002-03-04
IPC分类号： B23K1000
CPC分类号： H05H1/36 , H05H2001/3473
摘要： A solenoid control and safety circuit suitable for use in connection with contact start, plasma-arc torches. The system monitors a voltage to determine when to open an air control solenoid as part of a contact starting process. If a proper voltage is sensed, a gas solenoid is opened to allow airflow to separate the contact starting elements. The system also includes a circuit that monitors a gas pressure switch to determine whether sufficient pressure exists to separate the contact start elements after a contact start process has been initiated. The circuit removes power if it senses insufficient pressure. Also disclosed is a circuit that monitors a differential voltage between the electrode and the tip to determine if the elements remain in contact after airflow has been provided to the torch head.
摘要翻译： 电磁控制和安全电路，适用于接触起动，等离子弧焊炬。 系统监视电压，以确定何时打开空气控制电磁阀作为联系人启动过程的一部分。 如果检测到适当的电压，则打开气体螺线管以允许气流分离接触起始元件。 该系统还包括监测气体压力开关的电路，以确定是否存在足够的压力以在触发启动过程开始之后分离触点启动元件。 如果检测到压力不足，电路就会断电。 还公开了一种电路，其监测电极和尖端之间的差分电压，以确定在气流被提供到割炬头之后元件是否保持接触。
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公开(公告)号：US06960737B2
公开(公告)日：2005-11-01
申请号：US10652755
申请日：2003-08-29
申请人： David A. Tatham
发明人： David A. Tatham
CPC分类号： B23K10/006 , H05H1/34
摘要： A system for controlling gas flow from a gas source, through a gas conduit, and to a plasma arc torch during a transition from a cold flow when no arc is present to a hot flow when an arc is provided by the present invention. The system comprises a first solenoid in communication with the gas source, a second solenoid disposed proximate the plasma arc torch, and a bypass circuit in communication with the gas source and the second solenoid. The bypass circuit comprises a bypass solenoid that controls the gas pressure within the gas conduit to reduce gas flow fluctuations when transitioning from cold flow to hot flow. Additional gas control systems and methods are also provided that cause the gas pressure to be higher during cold flow, prior to arc ignition, which overcomes the rapid drop in flow that typically occurs during the transition to hot flow.
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公开(公告)号：US5530220A
公开(公告)日：1996-06-25
申请号：US225881
申请日：1994-04-11
申请人： David A. Tatham
发明人： David A. Tatham
CPC分类号： H05H1/36
摘要： An electronic circuit for a plasma arc torch that initiates the transfer of a pilot arc into an operating arc before operating current is sensed in a workpiece. The electronic circuit includes a power circuit output inductor, and a pilot circuit having a disconnect in series with the pilot electrode of the plasma torch. An oscillator is coupled to the disconnect to periodically open-circuit the pilot circuit before current is detected in the workpiece by a current sensor. The periodic cessation of current caused by the disconnect causes the output inductor to create a voltage spike that assists in the transfer by attempting to establish the operating arc between the electrode and the workpiece. Optionally, a pilot inductor in the pilot circuit provides transitory power to sustain the pilot arc during the time the pilot current source is ceased, should arc transfer not occur. If transfer occurs, the pilot circuit is kept open-circuited, else the pilot circuit is closed until current is sensed in the workpiece indicative of arc transfer or the oscillator again open-circuits the pilot regulator disconnect.
摘要翻译： 在工件中检测用于等离子体电弧炬的电子电路，该等离子弧炬在工作电流之前启动导向电弧转移到工作电弧。 电子电路包括电源电路输出电感器和具有与等离子体焰炬的引导电极串联断开的导频电路。 在通过电流传感器在工件中检测到电流之前，将振荡器耦合到断开器以周期性地使导通电路断开。 由断开导致的电流的周期性停止导致输出电感器产生电压尖峰，其通过试图在电极和工件之间建立工作电弧来帮助传输。 可选地，如果不发生电弧转移，导频电路中的导频电感器提供暂时功率以在导频电流源停止的时间期间维持导频电弧。 如果发生转换，则导通电路保持开路，否则导通电路关闭，直到在工件中检测到电流，表示电弧转移，或者振荡器再次使先导调节器断开。
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