CN1188701A - Plasma arc utilizing apparatus - Google Patents
Plasma arc utilizing apparatus Download PDFInfo
- Publication number
- CN1188701A CN1188701A CN97125527A CN97125527A CN1188701A CN 1188701 A CN1188701 A CN 1188701A CN 97125527 A CN97125527 A CN 97125527A CN 97125527 A CN97125527 A CN 97125527A CN 1188701 A CN1188701 A CN 1188701A
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- China
- Prior art keywords
- plasma arc
- torch electrode
- flow velocity
- gas
- spray torch
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- 239000007921 spray Substances 0.000 claims description 55
- 238000010891 electric arc Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 38
- 238000005507 spraying Methods 0.000 description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/006—Control circuits therefor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
- Plasma Technology (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
A DC power circuit, when an opening/closing switch is closed, supplies DC voltage between a torch electrode and a work piece. At the same time, a drive part is driven, a solenoid valve supplies compressed air by a first flow rate from a compressor to between the torch electrode and the work piece. A high frequency voltage generator generates a pilot arc between the torch electrode and a nozzle. When a plasma arc is generated, a plasma arc detector detects the arc and then the opening/ closing switch is closed. By this method, a drive part is driven, compressed air is supplied between the torch electrode and the nozzle from the solenoid valve, as well.
Description
The application is based on Japanese patent application HEI8-354211 number that submitted on December 17th, 1996, and it is used as with reference to incorporating among the application.
The present invention relates to plasma arc utilizing apparatus, for example utilize plasma arc to come the plasma arc welder and the plasma arc cutting cutting mill of processing work.
With a plasma arc cutting cutting mill is example, and it comprises a spray torch electrode that is surrounded by nozzle, has the gap between nozzle and spray torch electrode.The gas that plasma arc generation gas or be used to produces plasma arc is sent to this gap, and is used for producing between spray torch electrode and nozzle a pilot arc.Between the workpiece that spray torch electrode and cutting machine will be processed, added a DC voltage.In order to help the plasma arc that ignites, should between spray torch electrode and nozzle, add a high frequency voltage.Fig. 1 has shown an example of this plasma arc cutting cutting mill.
With reference to Fig. 1, this plasma arc cutting machine comprises a direct current supply line 2, and this circuit is started working when relay contact 4 closures.Closure when relay contact 4 is powered at relay controller 4D.Direct current supply line 2 has been imported an industrial alternating voltage and it has been converted to DC voltage between its input 6,6.This direct current supply line 2 can include one first rectifier, is used for industrial ac voltage rectifier and filtering for importing between its input.Become high frequency voltage from the DC voltage of first rectifier output by a high frequency inverter converts.High frequency voltage that should be synthetic is by an insulating transformer transformation, and reformed voltage is converted to DC voltage by one second rectifier.This DC voltage is by negative (-) of direct current supply line 2 and just exporting between (+) output.Negative terminal links to each other with the spray torch electrode 8 of cutting machine, and anode links to each other with the workpiece 10 that is cut.Owing to have the gap between spray torch electrode 8 and the workpiece 10, make between only add DC voltage and can not between them, produce electric arc.
The plasma arc cutting cutting mill also comprises a nozzle 11, and it surrounds spray torch electrode 8, and has the gap between the two.Pilot arc results between spray torch electrode 8 and the nozzle 11, and this pilot arc is used for spraying the plasma arc that ignites between torch electrode 8 and the workpiece 10.High-frequency voltage generator 12 is connected between the spray torch electrode 8 of the negative terminal of direct current supply line 2 and cutting machine, and this generator has produced a high-frequency pulse voltage for example several kilovolts of sizes.In addition, the current-limiting resistance 14 of series connection and normally closed switch 16 are connected between the anode of nozzle 11 and direct current supply line 2.A current detector 18 is connected between the anode of workpiece 10 and direct current supply line 2.This current detector 18 is used for detecting the plasma current of stream between spray torch electrode 8 and workpiece 10, and the signal of the electric current that representative detected that sends from current detector 18 is fed and is used for controlling the high frequency frequency converter to direct current supply line 2 and makes plasma current keep constant.
Gas source such as air compressor 20 are used to provide gas, it in this example air, to the gap of spraying between torch electrode 8 and the nozzle 11, be used between them producing plasma arc conduit 21 and connected gap between air compressor 20 and spray torch electrode 8 and the nozzle 11.Motor-driven valve such as magnetic valve 22 are among the conduit 21, and it is controlled by driver 22D and opens or closes.Magnetic valve 22 allows compressed air to be sent in the gap of spraying between torch electrode 8 and the nozzle 11 with predetermined flow velocity when opening.Magnetic valve 22 then stops the transmission of air in closure.
Fig. 2 has shown the duty of different piece of the circuit of prior art shown in Figure 1.
Shown in Fig. 2 (a), when switch 24 was operated personnel's closure, electric power offers relay controller 4D and electromagnetic valve driver 22D drives them.When magnetic valve 22 was driven, compressed air was sent in the gap of spraying between torch electrode 8 and the nozzle 11, shown in Fig. 2 (c) by magnetic valve 22 with predetermined speed.
The energising of relay controller 4D makes relay contact 4 closures, thereby the DC voltage that makes direct current supply line 2 provide is added between nozzle 11 and the spray torch electrode 8 by high-frequency voltage generator 12, current-limiting resistance 14 and normally closed switch 16.Simultaneously, a DC voltage is added between workpiece 10 and the spray torch electrode 8 by high-frequency voltage generator 12 and current detector 18.In this state, have the gap owing to exist between gap, spray torch electrode 8 and the nozzle 11 between workpiece 10 and the spray torch electrode 8, electric arc is not according to such generation that illustrates previously.It should be noted that in this state the gap between workpiece 10 and the spray torch electrode 8 is less than the gap between spray torch electrode 8 and the nozzle 11.
With the closed corresponding time points of relay contact 4, high-frequency voltage generator 12 energisings, thus the high frequency voltage that is produced is added between spray torch electrode 8 and the nozzle 11 has produced a pilot arc between them, shown in Fig. 2 (b).In this state, guide current such as 15A flow between nozzle 11 and spray torch electrode 8.Then, spray torch electrode 8 and nozzle 11 are by the gap smaller that makes between spray torch electrode 8 and the workpiece 10 near workpiece 10.Then, pilot arc causes producing plasma arc between spray torch electrode 8 and workpiece 10, and principal current or plasma current begin to flow between them, shown in Fig. 2 (d).
Principal current is detected by current detector 18, and the output of current detector 18 is fed and is used for constant current control supply line to direct current supply line 2 and makes it that a constant principal current such as 70A can be provided.The principal current signal that is detected by current detector 18 makes normally closed switch 16 open, thereby interrupts guide current.Simultaneously, high-frequency voltage generator 12 outages.
The generation of flowing of pilot arc and principal current becomes plasma to compressed air.
In order to stop the plasma arc cutting cutting mill, operating personnel open switch 24, and this just stops to provide electric power for relay controller 4D and electromagnetic valve driver 22D.So relay contact 4 is opened, thereby make direct current supply line 2 quit work.Owing to stop the power supply to driver 22D, magnetic valve 22 is also just closed, and this just causes interrupting transmitting compressed air.
In the plasma arc cutting cutting mill of said structure, produce from pilot arc, by handling cutting machine, compressed air is sent between nozzle 11 and the spray torch electrode 8 continuously.Velocity of compressed air is the speed of desired plasma arc.For example, for principal current or the plasma current of 70A, velocity of compressed air can be 270l/m.This flow velocity is too high sometimes so that can not ignite and keep pilot arc.
Can be with the high-frequency voltage generator that big power output can be provided for a solution of this problem, and with the direct current supply line that high voltage can be provided, make between nozzle 11 and spray torch electrode 8, can add higher voltage, perhaps the current-limiting resistance that passes through with the big guide current of a permission.Yet the shortcoming of using these elements is to increase the size and the cost of plasma arc cutting cutting mill.
Above-mentioned structure also has another shortcoming.In plasma arc utilizing apparatus, inert gas such as argon gas can replace compressed air to be used as plasma arc generation gas.In order to hold these gas, can use cylindrical bottle.Yet the gas flow that bottle can hold is limited.The plasma arc cutting cutting mill of said structure is waste gas when producing pilot arc.
The present invention is used to get rid of and comprises top said these problems.
According to the present invention, plasma arc utilizing apparatus comprises DC power supply apparatus, this device power on signal is reflected at the spray torch electrode of equipment and the workpiece processed by equipment between add a DC voltage.To the generation device of the pilot arc of power on signal reaction make spray torch electrode and be in around it and produce pilot arc at a distance of between the nozzle of certain interval.The gas flow rate adjusting device is used for allowing plasma generation gas to flow into the gap of spraying between torch electrode and the nozzle with one of optional first and second flow velocitys from plasma generation gas source.Wherein second flow velocity is higher than first flow velocity.The plasma arc checkout gear is used for detecting the plasma arc between present spray torch electrode and the workpiece and produces a signal of representing plasma arc.Current velocity controller control gas flow rate adjusting device makes that when power on signal is provided plasma arc generation gas can transmit with first flow velocity, and when the plasma arc detection signal produces, plasma arc generation gas can be transmitted with second flow velocity.
According to the present invention, in order to produce pilot arc, current velocity controller makes the gas flow rate adjusting device allow plasma arc gas to be sent to the gap of spraying between torch electrode and the nozzle from plasma arc generation gas source with first flow velocity.In case produced plasma arc between spray torch electrode and workpiece, this current velocity controller just work makes the gas flow rate adjusting device allow plasma arc generation gas to flow in the gap of spraying between torch electrode and the nozzle with second flow velocity that is higher than first flow velocity.
The gas flow rate adjusting device can comprise first and second flow rate adjustment devices of mutual parallel connection.When power on signal was not provided, first current velocity controller was idle, and when power on signal produced, it was work, and allowed plasma arc generation gas to transmit with first flow velocity.When the signal of representing plasma arc did not produce, second flow rate adjustment device was idle, and when the plasma arc detection signal produced, it was work, and allowed plasma arc generation gas to flow with the speed of the gap that equals first and second flow velocity.
With this structure of gas flow rate adjusting device, when pilot arc produced, only first flow rate adjustment device was work, and it allows plasma arc generation gas to flow in the gap of spraying between torch electrode and the nozzle with first flow velocity.When plasma arc produced, except first flow rate adjustment device, second flow rate adjustment device also was work, and it allows gas not only to be sent in the gap of spraying between torch electrode and the nozzle by first flow rate adjustment device but also by second flow rate adjustment device.Have only when a signal occurs, first and second flow rate adjustment devices all are activated to allow gas to transmit, and then close when blackout.Therefore, current velocity controller can on-off be controlled first and second flow rate adjustment devices and is gone the adjustments of gas flow velocity just enough.
This DC power supply apparatus can be controlled by constant current.The plasma arc checkout gear detects the electric current flow through spray torch electrode and workpiece, and detected electric current is added on the DC power supply apparatus as a control signal, and this signal controlling DC power supply apparatus provides constant current.
Thereby the plasma arc checkout gear not only is used to detect the generation of plasma arc, but also is used for constant current control DC power supply apparatus.
Fig. 1 is the block diagram according to the plasma arc cutting cutting mill of prior art.
Fig. 2 has illustrated the duty of the different piece of plasma arc cutting cutting mill shown in Figure 1.
Fig. 3 is the block diagram of plasma arc cutting cutting mill according to an embodiment of the invention.
Fig. 4 has illustrated the duty of the different piece of plasma arc cutting cutting mill shown in Figure 3.
Describe the present invention in detail with the plasma arc cutting cutting mill shown in Fig. 3,4.About parts and the function shown in Fig. 3,4, used identical reference number to represent, parts shown in these parts and function and Fig. 1,2 and function are similar, thereby do not provide their detailed description.
In an illustrated embodiment, DC power supply apparatus comprises a direct current supply line 2.The plasma arc generating means comprises a high-frequency voltage generator 12, a current-limiting resistance 14 and a normally closed switch 16.Air compressor 20 provides plasma arc generation gas or compressed air.The device that produces power on signal comprises a hand switch 24, and the plasma arc checkout gear comprises a current detector 18.
In a difference between structure shown in Figure 1 and the equipment of the present invention shown in Figure 3 is the gas flow rate adjusting device that is among the conduit 21.Gas flow rate adjusting device in this equipment shown in Figure 3 comprises the magnetic valve 28 and 30 of motor-driven valve such as parallel connection.
When not having electric power to offer driver 28D, magnetic valve 28 is by relative driver 28D closure, and magnetic valve 28 is opened when driver 28D is powered.When magnetic valve 28 is opened, its allow compressed air from air compressor 20 with first flow velocity such as 90l/m by and flow into the nozzle 11 and the gap between the spray torch electrode 8 of this plasma arc cutting machine.The size of first flow velocity can for as from 70l/m to 90l/m.
When not having electric power to offer driver 30D, magnetic valve 30 is by relative driver 30D closure, and magnetic valve 30 is opened when driver 30D is powered.When magnetic valve 30 is opened, its allow compressed air from gas source 20 with flow velocity such as 180l/m by and flow into the gap between spray torch electrode 8 and the nozzle 11.The size of the flow velocity that is provided by magnetic valve 30 can be from 180l/m to 200l/m.So when magnetic valve 28 and 30 was all leaving, compressed air just was sent in the gap of spraying between torch electrode 8 and the nozzle 11 as being approximately 270l/m with second flow velocity.Determine that second flow velocity makes plasma arc produce and keeps satisfactorily, this moment stream between spray torch electrode 8 and workpiece 10 plasma current or the size of principal current be as 70A.Obviously, magnetic valve 30 allows gas with a velocity flow mistake that equals the difference of first and second flow velocity.
The driver 28D that is used for magnetic valve 28 is in parallel with relay controller 4D.Therefore, when switch 24 was operated personnel's closure, driver 28D then switched on and makes magnetic valve 28 open.On the other hand, when switch 24 was operated personnel and opens, driver 28D then cut off the power supply, so magnetic valve 28 closures.
The driver 30D that is used for magnetic valve 30 connects with a switch 32, be connected between the supply lines 25,25 after both series connection, this supply lines is used for from a suitable power supply (not drawing the figure) to they provide electric power, also provides electric power for relay controller 4D and electromagnetic valve driver 28D simultaneously.When current detector 18 was detecting principal current or plasma current, switch 32 remained closed.So when arc-plasma current flows, be used for the driver 30D energising of magnetic valve 30, thereby magnetic valve 30 is opened.
Shown in Fig. 4 (a), when switch 24 closures, electric power offers relay controller 4D and electromagnetic valve driver 28D by supply lines 25,25.The energising of driver 28D makes magnetic valve 28 open, thereby compressed air is sent in the gap of spraying between torch electrode 8 and the nozzle 11, shown in Fig. 4 (c) with first flow velocity.First flow velocity is approximately and produces and keep 1/3 of the required flow velocity of plasma arc.
The energising of relay controller 4D makes relay contact 4 closures, thereby makes direct current supply line 2 between spray torch electrode 8 and the nozzle 11, provide DC voltage between spray torch electrode 8 and workpiece 10.In this state, have the gap owing to exist between gap, spray torch electrode 8 and the workpiece 10 between spray torch electrode 8 and the nozzle 11, pilot arc and plasma arc all can not produce.
With the closed corresponding time points of relay contact 4, high-frequency voltage generator 12 energisings, and provide a high frequency voltage between spray torch electrode 8 and nozzle 11 are shown in Fig. 4 (b).This makes and has produced pilot arc between them, thereby makes guide current flow between them.As mentioned above, the velocity of compressed air under this kind state is lower than the velocity of compressed air that produces plasma arc, so pilot arc can easily produce.Therefore, guide current can be for as 10A, less than the desired guide current of plasma arc cutting cutting mill of prior art shown in Figure 1.Thereby high-frequency voltage generator 12 need not provide big power in order to produce pilot arc, and direct current supply line 2 does not need to provide high voltage yet.And current-limiting resistance 14 need not must be a small resistor for big guide current is provided also.
In case produced pilot arc, spray torch electrode 8 is by close workpiece 10.Pilot arc helps to produce master's (plasma) electric current of plasma arc and stream between between spray torch electrode 8 and workpiece 10, shown in Fig. 4 (d).
Principal current is detected by current detector 18, and makes switch 32 closures.Then this just makes electric power offer electromagnetic valve driver 30D thereby has opened magnetic valve 30, thereby compressed air passes through magnetic valve 30 with the flow velocity from about 180l/m to about 200l/m, shown in Fig. 4 (e).Therefore, because magnetic valve 28 and 30 is all opened, compressed air just flows in the gap of spraying between torch electrode 8 and the nozzle 11, shown in Fig. 4 (f) with an overall flow rate 270l/m.This flow velocity is that the plasma arc that produces and keep between spray torch electrode 8 and the workpiece 10 is desired.
Being fed the frequency converter that is used for controlling in the direct current supply line 2 to direct current supply line 2 by the detected signal of representing plasma current of current detector 18 makes plasma current remain on for example 70A.And, make direct current supply line 2 stop high-frequency voltage generator 12 by the signal of current detector 18 detected principal currents.Simultaneously, switch 16 is opened, thereby pilot arc is disappeared.
When plasma arc was finished the cutting of workpiece 10, switch 24 was operated personnel and opens.This makes the electric power of supplying with relay controller 4D and driver 28D be interrupted.Thereby make relay contact 4 open.Then make direct current supply line 2 stop to produce DC voltage.The interruption of supplying with the electric power of driver 28D also makes magnetic valve 28 closures.Because do not add DC voltage, plasma arc has disappeared, thereby does not have principal current or plasma current to flow.Because current detector 18 detects less than principal current, switch 32 is opened automatically and is made electric power not resupply electromagnetic valve driver 30D, and this makes magnetic valve 30 closures.Thereby magnetic valve 28 and 30 is all closed, thereby makes compressed air no longer be sent in the gap of spraying between torch electrode 8 and the nozzle 11.
When switch 24 is opened and during the work of interrupting device, switch 16 auto-closings.
In the above-described embodiment, magnetic valve 28 that can open and close and 30 is as flow rate adjustment device.Use such valve just to allow the control circuit with a simple structure, it only needs switch driver 28D and 30D to control magnetic valve 28 and 30.In other words, an independent flow control valve can be used to replace two magnetic valves 28 and 30.In such cases, when switch 24 closures, this flow control valve is controlled to be used to provide first flow velocity, and it is used to provide second flow velocity when current detector 18 detects arc-plasma current.
Inert gas, oxygen or similar gas can be used to replace compressed air as the plasma arc generation gas that produces plasma arc.If use such gas, a cylindrical bottle of holding this gas can be used to replace air compressor 20 as plasma arc generation gas source.
With the embodiment in the plasma arc cutting cutting mill the present invention has been described above.Yet the present invention also can be implemented in other the plasma arc utilizing apparatus, as plasma arc welder.
Claims (7)
1. a plasma arc utilizing apparatus comprises:
To the DC power supply apparatus of adding power on signal reaction, this device is used for adding a DC voltage between the spray torch electrode of described plasma arc utilizing apparatus and the workpiece processed by described plasma arc utilizing apparatus;
To the device of adding power on signal reaction, this device is used for producing pilot arc between described spray torch electrode and nozzle, this nozzle be in described spray torch electrode around, and have the gap between the two;
Be used between described spray torch electrode and described workpiece, producing the gas source of plasma arc;
The gas flow rate adjusting device, be used for making described gas alternatively with first and second flow velocitys from described gas source is sent to gap between described spray torch electrode and the described nozzle, described second flow velocity is higher than first flow velocity;
Be used to provide the device of described power on signal;
The plasma arc checkout gear when plasma arc occurs, is used for producing a signal of representing plasma arc between described spray torch electrode and described workpiece; And
Current velocity controller when described power on signal is provided, is used for controlling described gas flow rate adjusting device described first flow velocity is provided, and described second flow velocity is provided when the signal of described representative plasma arc is provided.
2. according to the plasma arc utilizing apparatus of claim 1, wherein said gas flow rate adjusting device comprises:
First flow rate adjustment device, when described power on signal did not add to it, it was closed, and when described power on signal added to it, it was opened, and passed through with described first flow velocity to allow described gas; And
Second flow rate adjustment device in parallel with described first flow rate adjustment device, it is closed when the signal of described representative plasma arc does not add to described second flow rate adjustment device, and when the signal of described representative plasma arc adds to it, it is opened, and passes through with the flow velocity of the difference that equals described first and second flow velocitys to allow described gas.
3. according to the plasma arc utilizing apparatus of claim 1, wherein said DC power supply apparatus is controlled by constant current; And described plasma arc checkout gear detects the electric current that flows through described spray torch electrode and described workpiece, and described detected electric current also is added on the described DC power supply apparatus as a control electric current that is used for its constant current control.
4. a plasma arc utilizing apparatus comprises:
The DC power supply apparatus of a contact-carrying, when the described closing of contact, it is used for adding a DC voltage between the spray torch electrode of described plasma arc utilizing apparatus and the workpiece processed by described plasma arc utilizing apparatus;
A high-frequency voltage generator of working when the described closing of contact is used for striding across the gap and produces a pilot arc between described spray torch electrode and nozzle, this nozzle be in described spray torch electrode around;
A plasma arc generation gas source;
Gas flow rate regulon between described plasma arc generation gas source and described gap, it is used for making described plasma arc generation gas to be sent in the described gap with one of selected first and second flow velocitys, and described second flow velocity is higher than described first flow velocity;
A plasma arc detector is used for detecting the plasma arc that occurs between described spray torch electrode and described workpiece, and produces a signal of representing plasma arc;
A master cock;
A contact driver is used for when described master cock is worked closed described contact;
A flow velocity control module, when described master cock is worked, it is used for controlling described gas flow rate regulon and transmits described plasma arc generation gas with first flow velocity, and when the signal of described representative plasma arc produced, it was used for making described gas flow rate regulon to transmit described plasma arc generation gas with described second flow velocity.
5. according to the plasma arc utilizing apparatus of claim 4, wherein said gas flow rate regulon comprises:
First valve that has first driver, when electric current was provided for described first driver, it was used for allowing described plasma arc generation gas to pass through with described first flow velocity; And
Second valve that has second driver, it and the described first valve parallel connection, when electric current was provided for described second driver, it was used for allowing described plasma arc generation gas to pass through with the 3rd flow velocity, and described the 3rd flow velocity equals the poor of described first and second flow velocitys.
6. according to the plasma arc utilizing apparatus of claim 5, wherein said master cock is one and connects with described contact driver and to be connected across on-off switch between the power supply;
Described first driver is in parallel with described contact driver;
The switch of a closure when the signal of described representative plasma arc produces, connecting with described second driver is connected across between the described power supply.
7. according to the plasma arc utilizing apparatus of claim 4, wherein said first flow velocity is to be required for the flow velocity that produces an electric arc between described spray torch electrode and described nozzle, and described second flow velocity is to be required for the flow velocity that produces an electric arc between described spray torch electrode and described workpiece.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8354211A JPH10175073A (en) | 1996-12-17 | 1996-12-17 | Plasma arc utilizing machine |
| JP354211/96 | 1996-12-17 | ||
| JP354211/1996 | 1996-12-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1188701A true CN1188701A (en) | 1998-07-29 |
| CN1053603C CN1053603C (en) | 2000-06-21 |
Family
ID=18436038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97125527A Expired - Fee Related CN1053603C (en) | 1996-12-17 | 1997-12-17 | Plasma arc utilizing apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH10175073A (en) |
| KR (1) | KR100263363B1 (en) |
| CN (1) | CN1053603C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2882671B1 (en) * | 2005-03-03 | 2007-04-27 | Soudure Autogene Francaise Sa | PLASMA CUTTING STATION WITH INTEGRATED AIR COMPRESSOR |
| JP5103738B2 (en) * | 2006-01-12 | 2012-12-19 | パナソニック株式会社 | Atmospheric pressure plasma processing method and apparatus |
| JP5162828B2 (en) * | 2006-01-12 | 2013-03-13 | パナソニック株式会社 | Atmospheric pressure plasma processing method and apparatus |
| JP2008103141A (en) * | 2006-10-18 | 2008-05-01 | Tohoku Univ | Plasma generating device and plasma generating method |
| CN109807442B (en) * | 2018-12-28 | 2021-04-20 | 上海沪工焊接集团股份有限公司 | Control method of non-high-frequency plasma cutting machine |
| CN110434440B (en) * | 2019-08-29 | 2024-06-07 | 深圳市景布科技发展有限公司 | Control circuit of plasma cutting machine with built-in air compressor |
| CN115815748B (en) * | 2022-12-22 | 2024-06-14 | 中国航天空气动力技术研究院 | Constant-pressure fixed-arc-length arc heater and arc transferring and starting method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1012044B (en) * | 1988-05-12 | 1991-03-20 | 国家机械工业委员会哈尔滨焊接研究所 | Single-power plasma welding method with molten electrode protected by gas |
-
1996
- 1996-12-17 JP JP8354211A patent/JPH10175073A/en active Pending
-
1997
- 1997-12-09 KR KR1019970066886A patent/KR100263363B1/en not_active IP Right Cessation
- 1997-12-17 CN CN97125527A patent/CN1053603C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR100263363B1 (en) | 2000-08-01 |
| CN1053603C (en) | 2000-06-21 |
| KR19980063921A (en) | 1998-10-07 |
| JPH10175073A (en) | 1998-06-30 |
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