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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：US4585921A
公开(公告)日：1986-04-29
申请号：US515950
申请日：1983-07-20
申请人： Raymond G. Wilkins , Bruce O. Hatch
发明人： Raymond G. Wilkins , Bruce O. Hatch
摘要： The present invention minimizes shock hazard in using a touch start plasma torch. The resistance between the torch tip and the workpiece is compared to a predetermined value set by estimating the resistance between a person's hand to ground under the most unfavorable conditions. In the preferred embodiment, such comparison is performed by supplying an AC voltage to a resistor in series with a torch tip, the resistor having a resistance equal to the predetermined value. The peak voltage at a point in the circuit connection between the resistor and torch tip is sensed and if such peak is less than half of the peak voltage of the AC voltage supplied to the resistor and torch tip, the resistance between the torch tip and ground is less than the predetermined value and a control signal will be generated. A relay will switch on the power supply supplying high voltage between the cathode and the workpiece only when it receives the control signal indicating that the resistance between the torch tip and ground is below the predetermined value.
摘要翻译： 本发明使触摸启动等离子体焰炬中的电击危害最小化。 通过在最不利的条件下估计人的手与地面之间的电阻，将焊炬尖和工件之间的电阻与预定值进行比较。 在优选实施例中，通过向与电极尖端串联的电阻器提供AC电压来执行这种比较，该电阻器具有等于预定值的电阻。 检测电阻器和割炬尖端之间的电路连接点处的峰值电压，如果这样的峰值小于提供给电阻器和割炬尖端的交流电压的峰值电压的一半，则焊炬尖端与地之间的电阻 小于预定值，并且将产生控制信号。 只有当接收到指示割炬尖端和地面之间的电阻低于预定值的控制信号时，继电器将接通供电电压的电源。
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公开(公告)号：US4782210A
公开(公告)日：1988-11-01
申请号：US67017
申请日：1987-06-26
CPC分类号： B23K9/24 , B23K35/0205 , B23K9/296 , H05H1/34 , H05H2001/3442 , H05H2001/3468
摘要： An electrode used in a plasma-arc torch has ridges formed on the side surface thereof for initiating a pilot arc. The required voltage for initiating a pilot arc is substantially reduced by employing this type of electrode. The ridges have much smaller radii of curvature which substantially enhance the local electric field strength responsible for creating the pilot arc discharge. The ridges are oriented substantially along the flow lines of the plasma gas so as to create the least disturbance. In one embodiment with spiral gas flow, this results in helically oriented ridges. In another embodiment with straight gas flow, the ridges are parallel to the longitudinal axis of the electrode.
摘要翻译： 用于等离子体电弧焊炬的电极在其侧表面上形成有用于引发导电弧的脊。 通过使用这种类型的电极，用于引发导电弧的所需电压大大降低。 脊具有更小的曲率半径，其基本上增强了负责产生导电电弧放电的局部电场强度。 脊基本上沿着等离子体气体的流动线定向，以产生最小的扰动。 在具有螺旋气流的一个实施例中，这导致螺旋形定向的脊。 在具有直气流的另一实施例中，脊平行于电极的纵向轴线。
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公开(公告)号：US4225769A
公开(公告)日：1980-09-30
申请号：US836816
申请日：1977-09-26
申请人： Raymond G. Wilkins
发明人： Raymond G. Wilkins
CPC分类号： B23K9/0678 , H05H1/36
摘要： A plasma torch system is provided which creates a pilot arc having high instantaneous power and low average power. The pilot arc ignition circuit reduces the pilot arc duty cycle by pulsing on the pilot arc and then extinguishing it. A plasma torch disclosed also reduces RF noise in the line by eliminating the additional spark gap typically used in the power supply circuit and by placing the triggering circuit on or adjacent the torch handle.
摘要翻译： 提供了一种等离子体焰炬系统，其产生具有高瞬时功率和低平均功率的先导电弧。 先导电弧点火电路通过在引导电弧上脉冲然后熄灭先导电弧工作循环来减少。 公开的等离子体炬还通过消除通常在电源电路中使用的附加火花隙以及通过将触发电路放置在火炬手柄上或其附近来降低线路中的RF噪声。
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