EP0212190B1 - Appareil pour couper des pièces - Google Patents

Appareil pour couper des pièces Download PDF

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Publication number
EP0212190B1
EP0212190B1 EP86109217A EP86109217A EP0212190B1 EP 0212190 B1 EP0212190 B1 EP 0212190B1 EP 86109217 A EP86109217 A EP 86109217A EP 86109217 A EP86109217 A EP 86109217A EP 0212190 B1 EP0212190 B1 EP 0212190B1
Authority
EP
European Patent Office
Prior art keywords
cutting
ignition
oxygen
gas
heating
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.)
Expired - Lifetime
Application number
EP86109217A
Other languages
German (de)
English (en)
Other versions
EP0212190A3 (en
EP0212190A2 (fr
Inventor
Karl August Becker
Karl Gollwitz
Traugott Gutermann
Klaus Sonnenborn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to AT86109217T priority Critical patent/ATE60831T1/de
Publication of EP0212190A2 publication Critical patent/EP0212190A2/fr
Publication of EP0212190A3 publication Critical patent/EP0212190A3/de
Application granted granted Critical
Publication of EP0212190B1 publication Critical patent/EP0212190B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/38—Torches, e.g. for brazing or heating
    • F23D14/42—Torches, e.g. for brazing or heating for cutting

Definitions

  • the invention relates to a device for cutting workpieces according to the preamble of claim 1.
  • Such cutting torches are preferably used in NC flame cutting systems for cutting out individual workpieces from large-area plates, the cutting process being carried out with a fuel gas heating oxygen flame and cutting oxygen.
  • the heat emitted by the heating flame and the heat generated during the combustion of the material enables continuous combustion by the cutting oxygen jet.
  • the heating flame must be ignited with an ignition device before the flame cut.
  • the flow velocity in this heating slot is so great that the flame lifts off at the end face of the slot nozzle and disturbs the flow behavior of the immediately adjacent heating flames. Turbulence arises.
  • the specific heating power per unit area decreases in this entire area, which leads to cutting break if, as is the normal case, this area assumes a leading function during flame cutting and the predetermined cutting speed is maintained.
  • the invention has for its object to provide an ignition device in a cutting torch according to the preamble of the main claim, prevents flashbacks in the channel for the fuel gas-heating oxygen mixture, as well as avoid negative influences by the cutting oxygen and one of the setting of the heating gases of the cutting torch independent and uncontrollable amount of ignition gas can be supplied to the ignition point.
  • the fuel gas-oxygen mixture supply opens at an acute angle of preferably 15 to 30 ° into the cutting oxygen channel so that the ignition gas is in the spark range, preferably as a spark plug trained electrical ignition device is directed.
  • the screw-in center electrode of the spark / glow plug is preferably also arranged at an acute angle to the cutting oxygen channel and preferably forms an angle of, for example, 30 ° with the mixture feed.
  • the advantages achieved by the invention consist in particular in the fact that the separate fuel gas / oxygen mixture supply means that flame Setbacks in the heating gas channel can be reliably prevented and, at the same time, influencing the escaping heating gas when cutting oxygen is switched on is reliably avoided.
  • the direct connection of the mixture supply to the supply sources and the interposition of a pilot gas quantity control device advantageously achieves an electrical ignition of the main flame that works independently and cannot be influenced by the setting of the heating gases of the cutting torch.
  • the defined amount of pilot gas per ignition for all fuel gases, such as acetylene, mixed gases, propane, methane (natural gas) can be set on the pilot gas quantity control device independently of the two persons via the NC control.
  • An advantageous injector tuning and an ignition gas distributor assigned to the injector on the output side make it possible to connect several burners to only one ignition gas quantity control device.
  • FIG. 1 The drawing shows a partial section of a cutting torch 10, (FIGS. 1 and 2), preferably a three-hose machine cutting torch, which essentially consists of a valve body 11, a torch head 12 and a guide tube 13 connecting the torch head 12 to the valve body 11 consists.
  • a nozzle not shown, is attached to the burner head 12.
  • the nozzle is preferably designed as a two-part slot nozzle.
  • the heating nozzle is screwed into the internal thread 14 by means of an external thread formed at its upper end and the cutting nozzle is screwed into the internal thread 15 of the burner head 12.
  • heating nozzle and the cutting nozzle in one piece, or to fasten it to the torch head 12 by means of a pressure screw (not shown).
  • the cutting channel arranged in the middle of the cutting nozzle is connected to the cutting oxygen channel 16 of the torch head 12.
  • the cutting nozzle is connected to the cutting oxygen supply source 19 by means of a threaded connector 18 and cutting oxygen line 20 via a connecting bore arranged in the valve body 11.
  • a regulating and / or control device 21 is arranged in the cutting oxygen line 20, with which the amount of cutting oxygen can be regulated and / or controlled.
  • the cutting channel of the cutting nozzle, not shown, the cutting oxygen channel 16 and the cutting oxygen tube 17 as well as the connecting bore, not shown, to the threaded connector 18 are preferably linear within the cutting torch 10 and thus advantageously enable the arrangement of a sensor for flame monitoring in the cutting oxygen tube / channel.
  • the heating nozzle is connected to the fuel gas supply source 24 via threaded connector 23 and fuel gas line 22 and to the heating oxygen source 9 via threaded connector 26 and heating oxygen line 27.
  • the fuel gas or heating oxygen guides arranged within the cutting torch 10 and connected to the threaded connections 23, 26 are not shown for reasons of clarity.
  • Regulation and / or control devices 8, 25 for regulating and / or controlling the fuel gas and the heating oxygen are arranged in the fuel gas line 22 and the heating oxygen line 27.
  • a backflow preventer with flame arrester and gas backflow valve is preferably arranged on the threaded connector 23.
  • the heating nozzle or the heating slots of the nozzle are connected via a fuel gas / heating oxygen mixture supply (heating gas mixture supply), not shown, to an injector, preferably arranged in the valve body 11.
  • the injector is connected to the threaded connector 23, 26 via a fuel gas guide and a heating oxygen guide.
  • An electrical ignition device which is designated 28 in its entirety, is arranged within the cutting torch 10.
  • the electrical ignition device 28 consists of a separate fuel gas-oxygen mixture feed 29 (ignition gas line) and an ignition device 30 designed as a spark / glow plug, which is connected via an ignition cable 31 to an ignition transformer (not shown in more detail).
  • the spark / glow plug has a central electrode 32 which can be screwed into the burner head 12 and which is screwed into the burner head at an acute angle 35 of preferably 9 ° in a gas-tight manner.
  • the center electrode 32 is attached in a gas-tight manner by means of a stuffing box 33 and a pressure screw 34 which can be screwed into the combustion head 12.
  • the center electrode is guided in a bore 36 arranged at an angle 35 to the straight cutting oxygen channel 16.
  • the bore 36 is connected to the cutting oxygen channel 16 and forms an ignition space 37 at the transition point, into which a pin-shaped body electrode 38 projects.
  • the body electrode 38 is preferably 1.5 to 2 mm from the center electrode 32 and is preferably fastened in the burner head 12.
  • the ignition gas line 29 opens out in front of the ignition chamber 37 an acute angle 39 of preferably 21 ° into the cutting oxygen channel 16.
  • the distance between the ignition space 37 and the ignition gas line 29 is designed such that the fuel gas oxygen mixture (ignition mixture) is directed directly into the spark region between the body electrode 38 and the center electrode 32.
  • the other end of the ignition gas line 29 is connected gas-tight to the valve body 11.
  • the pilot gas line 29 is connected to the pilot gas quantity control device 45 via a connecting bore arranged in the valve body 11, the threaded connector 40 and the non-return valve 41 with flame arrester and gas backflow valve as well as line 42.
  • the pilot gas quantity control device consists of a mixing point 46, preferably an injector, which is connected on the output side to a pilot gas distributor pipe 43 to which a plurality of cutting torches 10 can be connected via line 42.
  • the burner shut-off valves 44 are arranged in the line 42, but preferably on the cutting torch 10.
  • four connections 47, 48, 49, 50 for four cutting torches 10 are shown, only one cutting torch 10 being connected to the pilot gas distributor pipe 43 for reasons of clarity. Of course, it is also possible to connect two, three or four burners or more than four burners to the pilot gas distributor pipe 43.
  • fuel gas and oxygen are premixed outside the cutting torch 10 and fed into the distributor pipe 43.
  • the injector 46 can be used for all gases that can be used for flame cutting, such as acetylene, propane, methane (natural gas) in a mixture with oxygen, and enables a sufficient range of pressure-quantity settings.
  • the injector 46 is connected to the heating oxygen supply source 9 and the fuel gas supply source 24 via branch lines 51, 52 and connecting T-pieces 53, 54 arranged in the heating oxygen line 27 and the fuel gas line 22.
  • a pressure regulator 55, 56 is arranged in each of the branch lines 51, 52, at which the pressures for pilot oxygen and pilot gas are set according to operating tables.
  • the ignition gas line 29 it is also possible to connect the ignition gas line 29 to separate ignition gas supply sources (fuel gas and oxygen supply source). This makes it possible to make the ignition gas quantity control device 45 particularly simple, e.g. to be trained as a bypass.
  • the internal ignition device according to the invention described above with reference to the drawing for igniting a fuel gas / heating oxygen mixture emerging from a nozzle of a cutting torch 10 operates as follows:
  • a fuel gas pressure according to the operating table, for example 0.3 bar (when using acetylene as fuel gas), and an associated oxygen pressure of, for example, 1 bar with a flowing gas quantity at the oxygen pressure controller 55, with the solenoid valves 59, 60 switched on and the burner shut-off valves 44 open.
  • the pressure is preferably set with only one cutting torch 10 and a screwed-in nozzle of size 3 to 10 mm or larger.
  • the ignition process is initiated by operating a pressure switch.
  • a first time relay is switched on, which locks the cutting oxygen and releases the ignition oxygen via solenoid valve 59.
  • a second time relay switched on at time 0 delays the fuel gas supply and ignition, for example by 2 seconds.
  • the ignition oxygen is switched on via the first time relay by actuating the solenoid valve 59 and the fuel gas is connected via the second time relay by actuating the solenoid valve 60.
  • the ignition transformer With the activation of the fuel gas, the ignition transformer is switched on, so that ignition sparks between the center electrode 32 and the body electrode 38 arise.
  • the fuel gas-oxygen mixture flows directly via line 42, backflow preventer 41, threaded connector 40 and pilot gas line 29 into the ignition area of the ignition device 30.
  • the ignition takes place in the cutting oxygen channel 16 of the burner head 12 shortly before the cutting nozzle.
  • approximately 0.094 liters of oxygen and 0.045 liters of fuel gas are required per cutting torch.
  • the ignition flame that arises during the ignition process strikes out of the central cutting channel of the nozzle and ignites the heating gas flowing out of the heating gas mixture channel, not shown, so that the heating flame is formed in this way.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Laser Beam Processing (AREA)
  • Arc Welding In General (AREA)

Claims (7)

1. Appareil pour couper des pièces comportant un chalumeau de découpage (10) muni d'un canal pour d'alimentation en oxygène de découpage (16, 17), des alimentations en gaz combustible et oxygène de chauffage, une alimentation (29) débouchant dans le canal d'oxygène de découpage (16) et fournissant le mélange gaz combustible/oxygène ainsi qu'un dispositif d'allumage électrique, à l'intérieur du chalumeau de découpage (10), appareil caractérisé en ce que l'alimentation du mélange gaz combustible/oxygène se fait par une conduite distincte (29) qui est raccordée aux sources d'alimentation (9, 24) par l'intermédiaire d'un dispositif de régulation de débit de gaz d'allumage (45).
2. Appareil selon la revendication 1, caractérisé en ce que l'alimentation en mélange gazeux (29) se fait suivant un angle aigu (35) débouchant dans le canal d'oxygène de découpage (16).
3. Appareil selon la revendication 1 ou 2, caractérisé en ce que le dispositif d'allumage électrique (30) est une bougie d'allumage (33, 38) et l'alimentation en mélange (29) est dirigée dans la zone des étincelles de la bougie.
4. Appareil selon la revendication 3, caractérisé en ce que la bougie d'allumage comporte une électrode centrale (32) qui se visse et fait un angle aigu (39) par rapport au canal d'oxygène de découpage (16) et pénètre dans un volume d'allumage (37) relié au canal d'oxygène de découpage (16), volume dans lequel se trouve l'électrode de masse (38) à une certaine distance de l'électrode centrale (32).
5. Appareil selon la revendication 3 ou 4, caractérisé en ce que l'électrode de masse (38) est fixée dans la tête de chalumeau (12) du chalumeau de découpage (10).
6. Appareil selon la revendication 1, caractérisé en ce que le dispositif de régulation de débit de gaz d'allumage (45) comprend un point de mélange (46) avec des électrovannes (59, 60) en entrée, des dispositifs de sécurité anti-retour avec barrière à flamme et clapet anti-retour (57, 58) et des dispositifs de régulation de pression (55, 56).
7. Appareil selon la revendication 6, caractérisé en ce que le point de mélange (46) est relié en sortie à un répartiteur de gaz d'allumage (43) auquel on peut raccorder plusieurs chalumeaux (10).
EP86109217A 1985-08-03 1986-07-05 Appareil pour couper des pièces Expired - Lifetime EP0212190B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86109217T ATE60831T1 (de) 1985-08-03 1986-07-05 Einrichtung zum schneiden von werkstuecken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853527955 DE3527955A1 (de) 1985-08-03 1985-08-03 Schneidbrenner
DE3527955 1985-08-03

Publications (3)

Publication Number Publication Date
EP0212190A2 EP0212190A2 (fr) 1987-03-04
EP0212190A3 EP0212190A3 (en) 1988-01-13
EP0212190B1 true EP0212190B1 (fr) 1991-02-06

Family

ID=6277659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109217A Expired - Lifetime EP0212190B1 (fr) 1985-08-03 1986-07-05 Appareil pour couper des pièces

Country Status (3)

Country Link
EP (1) EP0212190B1 (fr)
AT (1) ATE60831T1 (fr)
DE (1) DE3527955A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103553008A (zh) * 2013-10-30 2014-02-05 欧萨斯能源环境设备(南京)有限公司 一种氨氧化炉点火装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3803444C1 (en) * 1988-02-05 1989-04-13 Messer Griesheim Gmbh, 6000 Frankfurt, De Gas-cutting or heating torch
DE3827750A1 (de) * 1988-08-16 1990-04-19 Messer Griesheim Gmbh Steuer- oder regelvorrichtung fuer zuendgase
DE3941370A1 (de) * 1989-12-15 1991-06-20 Messer Griesheim Gmbh Verfahren zum zuenden der hauptflammengase von einzelnen schneidbrennern
DE4143144C2 (de) * 1991-12-28 1996-06-13 Gce Rhoena Autogengeraete Gmbh Maschinenschneidbrenner mit Innenzündeinrichtung
DE4420935C1 (de) 1994-06-16 1995-07-20 Messer Griesheim Schweistechni Schneidbrenner
WO2009126631A2 (fr) 2008-04-08 2009-10-15 Victor Equipment Company Chalumeau soudeur perfectionné

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3255803A (en) * 1962-08-23 1966-06-14 Harris Calorific Co Torch with igniter
DD95736A1 (fr) * 1972-03-10 1973-02-12
DE2927695A1 (de) * 1979-07-09 1981-02-05 Messer Griesheim Gmbh Flaemmbrenner
GB2072317B (en) * 1980-03-11 1983-10-12 Hamworthy Engineering Burner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103553008A (zh) * 2013-10-30 2014-02-05 欧萨斯能源环境设备(南京)有限公司 一种氨氧化炉点火装置
CN103553008B (zh) * 2013-10-30 2016-01-20 欧萨斯能源环境设备(南京)有限公司 一种氨氧化炉点火装置

Also Published As

Publication number Publication date
EP0212190A3 (en) 1988-01-13
ATE60831T1 (de) 1991-02-15
DE3527955C2 (fr) 1989-03-30
DE3527955A1 (de) 1987-02-12
EP0212190A2 (fr) 1987-03-04

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