EP1924388A1 - Steam cutting method and torch for it - Google Patents
Steam cutting method and torch for itInfo
- Publication number
- EP1924388A1 EP1924388A1 EP06774755A EP06774755A EP1924388A1 EP 1924388 A1 EP1924388 A1 EP 1924388A1 EP 06774755 A EP06774755 A EP 06774755A EP 06774755 A EP06774755 A EP 06774755A EP 1924388 A1 EP1924388 A1 EP 1924388A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- burner
- liquid
- heating element
- evaporator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/26—Plasma torches
- H05H1/32—Plasma torches using an arc
- H05H1/34—Details, e.g. electrodes, nozzles
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/26—Plasma torches
- H05H1/32—Plasma torches using an arc
- H05H1/34—Details, e.g. electrodes, nozzles
- H05H1/3457—Nozzle protection devices
Definitions
- the invention relates to a method for converting a liquid into a gaseous state for a cutting process with a steam cutting device, and a burner for this purpose, as described in the preambles of claims 1 and 16.
- the prior art discloses methods for converting a liquid to a gaseous state for a cutting process with a steam cutting apparatus in which the evaporation of the liquid by heating a nozzle which returns the heat produced by an arc to an evaporator in the burner , whereby the liquid evaporates to a gas.
- EP 1 050 200 B1 discloses a steam cutting device in which a heating element is arranged in the burner. Furthermore, the burner has an evaporator, a power supply and a supply line for a liquid, wherein a corresponding temperature for the evaporation of the liquid is required. However, this does not deal in detail with the regulation of the temperature in the burner.
- the object of the invention is to provide a method and a device which allows an active control of pressure and temperature of the evaporated liquid.
- the object of the invention is achieved by a method mentioned above, in which the temperature is controlled in operation such that a sensor detects the temperature of the evaporator and transmitted to a control, which supplies the heating element with the necessary energy and of which a required Pressure of the liquid fed into the burner is controlled so that an approximately constant temperature of the evaporated liquid is provided for a cutting process.
- the object of the invention is also achieved by a burner mentioned above, in which a sensor is arranged, which detects the heat generated by the heating element and which is connected to a control for the heating element.
- the advantage here is that a fast response to temperature changes is achieved by combining the control of temperature and pressure. This allows a rapid response to different conditions during a cutting process, regardless of the application. It is also achieved that the wear of the wearing parts can be compensated or compensated, so they can be used longer. Likewise, the wear can be displayed accordingly.
- Another advantage is that a sensor is integrated in the burner, whereby a rapid intervention of the control is possible.
- the measure that the heating element is constantly supplied with energy is achieved in an advantageous manner that the heating element generates a constant temperature in the burner and a response time is omitted in a change in the energy supply.
- a heating element with low power can be used. This can provide more power for the cutting process. Likewise, the size of the burner is significantly reduced by a heating element with low power.
- the heating time causes a constant temperature cutting process to be started faster.
- the heating time depends on the temperature of the burner, resulting in a quick change of the power supply for the steam cutting device results in a short heating time and the cutting process can be started quickly.
- the measure that sudden temperature fluctuations are detected is achieved in an advantageous manner that a cutting process is not abruptly interrupted. This results in a better result of the cutting process.
- the advantage is that the base load is set depending on the heating time, whereby the constant temperature for the cutting process is available faster.
- the wear detection causes the wear parts can be used longer.
- FIG. 1 shows an exemplary representation of a steam cutting device
- FIG. 2 is an exemplary illustration of the cross section of the steam plasma burner
- Fig. 3 shows the schematic behavior of temperature, heat load and Pressure during a cutting operation
- Fig. 4 shows the schematic behavior of temperature and heat load at a sudden temperature change.
- a steam cutting device 1 is shown with a base unit Ia for a steam cutting process.
- the basic device Ia comprises a current source 2, a control device 3 and a blocking element 4 assigned to the control device 3.
- the blocking element 4 is connected to a container 5 and a steam plasma burner 6 via a supply line 7, so that the water vapor plasma burner 6 has a liquid 8 arranged in the container 5 can be supplied.
- the supply of the steam plasma burner 6 with electrical energy via lines 9, 10 from the power source. 2
- the steam plasma burner 6 of this is connected via a cooling circuit 11 at best with the interposition of a flow switch 12 with a liquid container 13.
- the cooling circuit 11 can be started by the control device 3 and thus a cooling of the burner 6 via the cooling circuit 11 can be achieved.
- the burner 6 is connected via cooling lines 14, 15 with the liquid container 13.
- the steam cutting device 1 may have an input and / or display device 16, via which the most varied parameters or operating modes of the steam cutting device 1 can be set and displayed.
- the parameters set via the input and / or display device 16 are forwarded to the control device 3, which controls the individual components of the steam cutting device 1 accordingly.
- the steam plasma burner 6 can have at least one operating element 17, in particular a pushbutton 18. about the operating element 17, in particular the button 18, the user can notify by activating and / or deactivating the button 18 of the control device 3 from the burner 6 that a steam cutting process should be started or performed.
- presettings can be made, for example, on the input and / or display device 16, in particular the material to be cut, the liquid used and, for example, characteristics of the current and the voltage are predefined.
- further operating elements can be arranged on the burner 6, via which one or more operating parameters of the steam cutting device 1 are set by the burner 6.
- these controls can be connected directly via lines or via a bus system with the steam cutting device 1, in particular the control device 3.
- the control device 3 activates after pressing the button 18, the individual components required for the steam cutting process. For example, first a pump (not shown), the blocking element 4 and the current source 2 are driven, whereby a supply of the burner 6 with the liquid 8 and electrical energy is introduced. Subsequently, the control device 3 activates the cooling circuit 11, so that a cooling of the burner 6 is made possible. By supplying the burner 6 with the liquid 8 and with energy, in particular with current and voltage, the liquid 8 is now in the burner 6 in a gas 19, in particular in plasma, converted at high temperature, so that by the burner from the sixth outflowing gas 19, a cutting process on a workpiece 20 can be performed.
- an arc is additionally required.
- the arc is ignited by the control device 4 or by pressing the button 18 and burns between a cathode 21, which is integrated in the burner 6 and preferably connected to the negative pole of the power source 2, and an anode, which is formed by a nozzle 22 and connected to the positive pole of the power source 2.
- the control device 4 When the burner 6 approaches the workpiece 20, the positive pole becomes the current source 2 is switched from the nozzle 22 to the workpiece 20, whereby the arc is driven by the gas 19 through an outlet opening 23 in the nozzle 22 to the outside and thus between the cathode 21 and the workpiece 20 burns.
- the current is increased accordingly by the control device 4, whereby, for example, the workpiece 20 can be separated.
- the control regulates the pressure 34, with which the liquid 8 is conveyed into the burner 6.
- the control ensures an approximately constant temperature of the gas 19.
- a fast response time of the heating element 24 is achieved, since the heating element 24 is constantly supplied with energy, which can be changed or adjusted accordingly by the regulation.
- control is integrated in the control device 3 of the steam cutting device 1 and is divided into a so-called "stand-by mode ⁇ and a" cutting operation ".
- the stand-by mode ⁇ is activated when the steam cutting device 1 is turned on.
- the heating element 24 is supplied by the control with the maximum energy, so 100 percent or full heat load.
- a so-called evaporator 25 is preheated until a certain threshold value 26, for example 190 ° C., for the temperature 27 of the evaporator 25 is reached.
- This threshold value 26 is detected by a sensor 28, which measures the temperature 27 of the evaporator 25.
- the sensor 28 passes the detected value to the controller.
- After reaching the threshold 26 is a predefined heating time started. This causes a heat propagation in the burner 6, whereby a constant temperature of the components involved in the cutting process, such as the cathode 21, is achieved in the burner 6.
- the heating time is determined by the regulation and is dependent on the temperature 27 of the evaporator 25 after switching on the steam cutting device 1. For example, the heating time after reaching the threshold value 26 is shorter, if after a cutting process, the location changed and thus the power supply of the steam cutting device 1 is briefly interrupted. If no cutting process takes place after switching on the steam cutting device 1 for a longer time, the temperature 27 of the evaporator 25 is kept at the threshold value 26. This takes place in such a way that the heating element 24 supplies the full heat load 29 for reaching the threshold value 26 or is switched off by the control after reaching the threshold value 26. Thus, in the "stand-by mode" is a so-called two-point controller for the control of the temperature 27th
- the heating element 24 supplies the full heating load 29. If the temperature 27 is above the threshold value 26, however, the heating element 24 delivers a specific base load 30. This establishes an approximately constant temperature 27 of the evaporator 25 , wherein the temperature 27 substantially corresponds to the temperature of the gas 19.
- a cutting process can be started, wherein the burner 6 is supplied with the liquid 8 via a feed line 31 and the liquid 8 is vaporized by the evaporator 25 to the gas 19.
- the region in which the liquid 8 is converted into the gas 19, that is to say vaporized, is referred to as the so-called evaporation zone 32.
- the gas 19 is an approximately constant temperature should the evaporator zone 32 in the evaporator 25 does not move or migrate. This is achieved in an advantageous manner by the base load 30, as by the base load 30, the heating element 24 is also active above the setpoint 26 and thus a constant temperature 27 of the evaporator 25 is ensured.
- the base load 30 is pulse width modulated and is preferably controlled between ten and ninety percent during the cutting process.
- the starting value for the base load 30, ie the value for the start of a cutting process, depends on the heating time of the burner 6. That is, the burner 6 had a lower temperature when switching on the steam cutting device 1, that is, a long heat-up time, sets a high value for the base load 30 as the starting value. Had the burner ⁇ when switching on the steam cutting device 1, a higher temperature, that is, a short heat-up time, a low value for the base load 30 sets as a starting value. In the further course, the base load 30 adjusts accordingly. So only when switching on a starting value for the base load 30 is specified, the base load 30 is regulated or adjusted during a cutting process.
- the base load 30 is controlled to eighty percent, whereby an optimal operating temperature of the gas 19 between 190 ° C and 240 ° C sets and a cutting process can be started faster.
- sufficient liquid 8 becomes gas for the cutting process
- the 20 burns. This is done by igniting the arc between the cathode 21 and the nozzle 22, the arc being driven by the gas 19 through the outlet opening 23 onto the workpiece 20.
- the burning arc has accordingly a high temperature, whereby in particular the nozzle 22 and the cathode 21 are heated. These in turn give off the heat to the evaporator zone 32, whereby the gas 19 is additionally heated.
- the base load 30 of the heating element 24 and the recirculated heat from the nozzle 22 increases and the cathode 21, the temperature 27 and thus the operating temperature of the gas 19.
- the control accordingly lowers the base load 30 of the heating element 24, for example by ten percent.
- the base load 30 is lowered by a further ten percent, for example.
- this process can be repeated as often until the base load 30 has been lowered to a value of ten percent. Since this control of the base load 30 is basically slow, this temperature control is supported by a pressure control or combined with this.
- the pressure control takes place, for example, via a valve 33 (not shown) integrated in the feed line 31 of the liquid 8 in the steam cutting device 1. It is likewise possible for the pressure control to be controlled directly, for example, via the pump which conveys the liquid 8 to the burner 6 Steam cutting device 1 takes place.
- This valve 33 is regulated by the pressure control accordingly. Basically, the pressure control is preferably in the range between five and seven bar.
- the pressure 34 of the liquid 8 is adjusted accordingly. For example, causes a higher pressure of the liquid 8, that with the current temperature 27 of the evaporator 25, the increased amount of liquid 8 must be evaporated. Thereby, the temperature of the evaporator 25 is lowered.
- the pressure control can also be used so that the temperature of the evaporator 25 is increased rapidly. This is done so that the pressure 34 of the liquid 8 is reduced. As a result, a smaller amount of liquid 8 is heated at the current temperature of the space 25, whereby it is increased. Due to the speed of the pressure control, this is preferably used first, ie before changing the base load 30 by the temperature control, to compensate for temperature fluctuations in the transition from the liquid state of the liquid 8 in the gaseous state of the gas 19.
- the burning arc causes the outlet opening 23 of the nozzle 22 to increase, as a result of which more gas 19 flows out through the outlet opening 23 and the temperature 27 of the evaporator 25 decreases. So that this does not adversely affect the cutting process, the controller 34 regulates or reduces the pressure accordingly after the change in the temperature 27 has been detected. Thus, the outflowing gas 19 reduces, whereby the temperature 27 of the evaporator 25 increases again and is thus kept approximately constant. If the diameter of the outlet opening 23 continues to increase, which in turn causes the temperature 27 of the evaporator 25 to decrease, the pressure 34 must be reduced even further after detecting the temperature change, for example to the minimum value of five bar.
- the control recognizes, on the basis of a low base load and a high pressure, that the nozzle 22 is in a good or very good condition.
- the regulation recognizes by means of a high base load and a low pressure that the nozzle 22 is in a bad condition and therefore needs to be changed. Accordingly, the wear of the nozzle can be displayed on the display device 16, for example.
- Fig. 3 the control of pressure and temperature is shown schematically and exemplarily during a cutting process.
- the temperature 27 fluctuates about the desired value 26 of the temperature 27, the pressure 34 being regulated as a function of the temperature 27 or the temperature difference from the desired value 26.
- the temperature 27 is controlled by the pressure 34.
- the base load 30 is preferably kept constant. In principle, therefore, the pressure 34 increases when the temperature 27 is above the desired value 26 or the pressure 34 drops when the temperature 27 is below the desired value 26.
- the temperature 27 rises continuously, whereby the pressure 34 is increased by the control accordingly to lower the temperature 27 again. If the pressure 34 exceeds an upper threshold value 36 of, for example, 6.5 bar, as can be seen at time 37, in addition the base load 30 is lowered, for example by ten percent. So that the temperature 27 is lowered again to the desired value 26, the pressure 34 remains at the maximum, as can be seen until the time 38. Depending on the time duration between time 37 and 38, ie from exceeding the threshold value 36 until the temperature 27 has reached the set value 26, the base load 30 can be reduced several times by a further ten percent until the minimum of ten percent has been reached.
- an upper threshold value 36 for example, 6.5 bar
- the base load 30 is lowered, for example by ten percent. So that the temperature 27 is lowered again to the desired value 26, the pressure 34 remains at the maximum, as can be seen until the time 38.
- the base load 30 can be reduced several times by a further ten percent until the minimum of ten percent has been reached.
- control according to the invention is extended so that sudden temperature drops are detected and counteracted accordingly.
- the temperature 27 increases continuously up to the time 42 during a cutting process, followed by a sudden temperature drop. This is shown between time 42 and 43.
- This temperature drop of, for example, 40 ° C per second is detected by the controller and responded accordingly, that is, the temperature 27 is controlled by the pressure 34, as already known.
- the base load 30 is increased to the full heat load 29 at time 42.
- the abrupt temperature drop is damped or flattened, and the constant temperature 27 of the evaporator 25 sets in again.
- the full heat load 29 is applied until the temperature drop has been correspondingly damped, as can be seen from time 43.
- the base load 30 is lowered back to the original value.
- the base load 30 is increased over a longer period of time to the full heating load 29, so that the approximately constant temperature 27 of the evaporator 25 sets. This advantageously prevents the threshold 26 of the temperature 27 from being broken by a steep edge. This could cause the regulation to no longer sink the temperature can brake, whereby the temperature 27 falls, for example, below 170 ° C and the steam cutter 1 automatically shuts off. Likewise, this regulation can be omitted, for example, when the temperature 27 is near the maximum temperature of for example 240 ° C.
- the regulation of pressure and temperature preferably takes place by a microcontroller, in particular by the microcontroller of the control device 3 of the steam cutting device 1.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Arc Welding In General (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Treatment Of Fiber Materials (AREA)
- Lubricants (AREA)
- Plasma Technology (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT06774755T ATE419947T1 (en) | 2005-09-09 | 2006-08-30 | WATER STEAM CUTTING PROCESS AND BURNER THEREOF |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0148005A AT502421B1 (en) | 2005-09-09 | 2005-09-09 | Steam cutter pistol for e.g. leather or fabric has steam temperature sensor linked to steam temperature regulator and heater |
PCT/AT2006/000356 WO2007028179A1 (en) | 2005-09-09 | 2006-08-30 | Steam cutting method and torch for it |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1924388A1 true EP1924388A1 (en) | 2008-05-28 |
EP1924388B1 EP1924388B1 (en) | 2009-01-07 |
Family
ID=37487690
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06774755A Not-in-force EP1924388B1 (en) | 2005-09-09 | 2006-08-30 | Steam cutting method and torch for it |
Country Status (8)
Country | Link |
---|---|
US (1) | US7965925B2 (en) |
EP (1) | EP1924388B1 (en) |
JP (1) | JP5500822B2 (en) |
CN (1) | CN101253017A (en) |
AT (2) | AT502421B1 (en) |
DE (1) | DE502006002611D1 (en) |
ES (1) | ES2318774T3 (en) |
WO (1) | WO2007028179A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2922406A1 (en) * | 2007-10-12 | 2009-04-17 | Commissariat Energie Atomique | LIQUID CHARGE INJECTION DEVICE FOR MIXING / CONVERTING WITHIN A DARD PLASMA OR A GASEOUS FLOW |
AT510012B1 (en) | 2010-12-29 | 2012-01-15 | Fronius Int Gmbh | HEATING ELEMENT, WATER VAPOR CUTTING DEVICE AND BURNER OF A POWER GENERATING DEVICE |
KR101484085B1 (en) * | 2013-08-09 | 2015-01-20 | 인하대학교 산학협력단 | Steam supply apparatus for steam plasma torch |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3242305A (en) * | 1963-07-03 | 1966-03-22 | Union Carbide Corp | Pressure retract arc torch |
US3567898A (en) * | 1968-07-01 | 1971-03-02 | Crucible Inc | Plasma arc cutting torch |
CH493183A (en) * | 1969-06-05 | 1970-06-30 | Lonza Ag | Method for regulating the flow in a liquid-stabilized plasma generator |
BE795891A (en) * | 1972-02-23 | 1973-06-18 | Electricity Council | PLASMA TORCH IMPROVEMENTS |
SE446316B (en) * | 1978-07-11 | 1986-09-01 | Gpnii Nikel Kobalt Olov Promy | PLASM TREATMENT PROCEDURE |
JPH0688597B2 (en) * | 1988-09-12 | 1994-11-09 | 松下電器産業株式会社 | Cartridge tank |
IT1225341B (en) * | 1988-11-15 | 1990-11-13 | Cebora Spa | PROTECTION CIRCUIT FOR A PLASMA WELDING OR CUTTING EQUIPMENT WITH NON-TRANSFERRED OR TRANSFERRED ARC |
US5609777A (en) * | 1993-02-23 | 1997-03-11 | Adamas At Ag | Electric-arc plasma steam torch |
JP3390788B2 (en) * | 1993-09-13 | 2003-03-31 | 独立行政法人産業技術総合研究所 | Method of generating high-frequency induction thermal plasma and method of decomposing organic halogen compound |
AUPM470994A0 (en) * | 1994-03-25 | 1994-04-21 | Commonwealth Scientific And Industrial Research Organisation | Plasma torch condition monitoring |
AUPM471094A0 (en) * | 1994-03-25 | 1994-04-21 | Commonwealth Scientific And Industrial Research Organisation | Detecting non-symmetrical nozzle wear in a plasma arc torch |
JP3307820B2 (en) * | 1996-02-07 | 2002-07-24 | 株式会社田中製作所 | Plasma electrode wear detection method |
AT406559B (en) * | 1998-01-23 | 2000-06-26 | Fronius Schweissmasch | BURNER FOR CUTTING PROCESS |
JP2000034572A (en) * | 1998-07-14 | 2000-02-02 | Canon Inc | Apparatus for forming vapor-deposited thin film |
US6133543A (en) * | 1998-11-06 | 2000-10-17 | Hypertherm, Inc. | System and method for dual threshold sensing in a plasma ARC torch |
JP2000288382A (en) * | 1999-04-09 | 2000-10-17 | Mitsubishi Heavy Ind Ltd | Apparatus for decomposing organohalogen compound |
JP2004111137A (en) * | 2002-09-17 | 2004-04-08 | Fujimura Tadamasa | Manufacturing method and manufacturing device of hydrogen by plasma reaction method |
JP4232951B2 (en) * | 2002-11-07 | 2009-03-04 | 独立行政法人産業技術総合研究所 | Inductively coupled plasma torch |
JP3883005B2 (en) * | 2003-03-07 | 2007-02-21 | 株式会社レイテック | Steam plasma torch |
US6992262B2 (en) * | 2003-10-09 | 2006-01-31 | Illinois Tool Works Inc. | Method and apparatus for localized control of a plasma cutter |
WO2006100701A1 (en) | 2005-03-24 | 2006-09-28 | I-Cap Exploitation Ireland, Ltd. | Plasma cutting device |
-
2005
- 2005-09-09 AT AT0148005A patent/AT502421B1/en not_active IP Right Cessation
-
2006
- 2006-08-30 ES ES06774755T patent/ES2318774T3/en active Active
- 2006-08-30 DE DE502006002611T patent/DE502006002611D1/en active Active
- 2006-08-30 WO PCT/AT2006/000356 patent/WO2007028179A1/en active Application Filing
- 2006-08-30 JP JP2008529409A patent/JP5500822B2/en not_active Expired - Fee Related
- 2006-08-30 AT AT06774755T patent/ATE419947T1/en not_active IP Right Cessation
- 2006-08-30 US US11/990,047 patent/US7965925B2/en not_active Expired - Fee Related
- 2006-08-30 CN CNA2006800317871A patent/CN101253017A/en active Pending
- 2006-08-30 EP EP06774755A patent/EP1924388B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2007028179A1 * |
Also Published As
Publication number | Publication date |
---|---|
AT502421A1 (en) | 2007-03-15 |
JP5500822B2 (en) | 2014-05-21 |
AT502421B1 (en) | 2007-06-15 |
US20100166395A1 (en) | 2010-07-01 |
CN101253017A (en) | 2008-08-27 |
JP2009507346A (en) | 2009-02-19 |
WO2007028179A8 (en) | 2007-05-24 |
US7965925B2 (en) | 2011-06-21 |
DE502006002611D1 (en) | 2009-02-26 |
EP1924388B1 (en) | 2009-01-07 |
WO2007028179A1 (en) | 2007-03-15 |
ES2318774T3 (en) | 2009-05-01 |
ATE419947T1 (en) | 2009-01-15 |
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