EP1363479A2 - Plasmaschneidbrennervorrichtung mit auswechselbaren Elementen für pneumatische und elektrische Bogenentzündung - Google Patents

Plasmaschneidbrennervorrichtung mit auswechselbaren Elementen für pneumatische und elektrische Bogenentzündung Download PDF

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Publication number
EP1363479A2
EP1363479A2 EP03010685A EP03010685A EP1363479A2 EP 1363479 A2 EP1363479 A2 EP 1363479A2 EP 03010685 A EP03010685 A EP 03010685A EP 03010685 A EP03010685 A EP 03010685A EP 1363479 A2 EP1363479 A2 EP 1363479A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
interchangeable
bush
electrode
support means
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.)
Withdrawn
Application number
EP03010685A
Other languages
English (en)
French (fr)
Inventor
Massimo Santini
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.)
Tecmo SRL
Original Assignee
Tecmo SRL
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 Tecmo SRL filed Critical Tecmo SRL
Publication of EP1363479A2 publication Critical patent/EP1363479A2/de
Withdrawn legal-status Critical Current

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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
    • H05H1/3489—Means for contact starting

Definitions

  • the present invention relates to devices for cutting metallic elements and particularly refers to a plasma cutting torch device with interchangeable elements for pneumatic and electric arc striking.
  • the main drawback of known torches consists in that they can work only with particular apparatuses capable to activate the respective striking devices.
  • An object of the present invention is to propose a plasma cutting torch device with pneumatic and electric arc striking capable to operate with apparatuses having electric and pneumatic arc striking by simply substituting some modular elements.
  • a torch also provided with support means for supporting the element to be cut and provided with an efficient cooling system whose fluid flow does not perturb the plasma jet.
  • numeral 1 indicates the device of the present invention including a body 2, first interchangeable bush members 3, first interchangeable electrode members 4, second interchangeable bush members 5 and second interchangeable electrode members 6.
  • the interchangeable bush members 3,5 are usually also indicated with the term "diffuser”.
  • the interchangeable members, first 3, 4 and second 5, 6, are alternatively fixed to the body 2 to allow striking conditions, respectively pneumatic striking condition P and electric striking condition E, of the plasma jet.
  • the body 2 has a mobile element 7 sliding inside a tubular element 8 to which a plasma jet outlet nozzle 9 is removably fixed, by means of a ring nut 24.
  • the mobile element 7 is elastically pushed towards the nozzle 9 by means of a helical spring and it is moved in the opposed direction by means of a pneumatic actuator, fed by the cooling and feeding compressed fluid of device 1.
  • connection means 10 consisting of a nut screw carried out in an end portion of a cavity 12 of the mobile element 7, fit for alternatively fixing the interchangeable electrode members 4, 6.
  • the pneumatic striking working condition P of device 1 is achieved by fixing the first electrode member 4 to the connection means 10 and by locking the first bush member 3 between the tubular element 8 and the nozzle 9.
  • the first electrode member 4 is slidably driven by the mobile element 7 inside the first bush member 3, between two conditions, a condition of contact C and a condition of maximum distance D with respect to the nozzle 9.
  • the second bush member 5 and the second electrode member 6, fixed to the connection means 10 are rigidly blocked to the tubular element 8 by stopping the mobile element 7 in a respective condition of maximum distance DD from the nozzle 9.
  • An end of the tubular element 8 has a first abutment means 11 for mating a first stop means 14 of the first electrode member 4 in the maximum distance condition in the pneumatic striking operation P, and a second stop means 15 of the second electrode member 6 in the electric striking working condition E.
  • Said end of the tubular element 8 is further provided with a first seat 13 for the end of the first bush member 3 which is opposed to the nozzle 9 and the latter has a second seat 16 for the corresponding end of the bush members 3, 5.
  • the second electrode member 6 has a third stop means 17 for the end of the second bush member 5, which is opposed to the nozzle 9.
  • the electrode members 4, 6 are provided with respective pluralities of first radial holes 18 in flow communication with the cavity 12 through respective ducts 19 of the electrode members 4, 6, for the flow of the cooling and feeding fluid of the device 1.
  • the bush members 3, 5 are provided with respective pluralities of second through radial holes 20 in flow communication with an interspace between the respective electrode members 4, 6 and the nozzle 9.
  • the first radial holes 18 of the first electrode member 4 flow outside the latter in correspondence of an annular groove 21 facing third radial holes 22 of the first bush member 3 in every pneumatic striking working condition.
  • the first electrode member 4 has an annular housing 30 for a seal means 31 fit to slidably mate the inner surface of the first bush member 3, interposed between the respective radial holes second 20 and third 22.
  • the ring nut 24 has a plurality of radial openings 26 for the fluid flow and in communication with an interspace 27 interposed between the sleeve 25 and a surface extending at the side of the ring nut 24 and the nozzle 9.
  • the ring nut has a plurality of inclined openings 28 for the fluid flow, each opening having a cylindrical tapered shape, with the wider diameter portion having an outlet facing the nozzle 9.
  • the electrode member 6 of the variant of figure 10 is provided, at the end facing the nozzle 9, with a plurality of grooves 23 fit to support the strike of the plasma jet.
  • the device can be provided with further interchangeable electrode and bush members having such dimensions and shapes to operate with power supplies and/or fluid flows having different values and characteristics.
  • the operation of the device and of the variants simply requires the assemblage of the second interchangeable electrode 6 and bush 5 members on the body 2, in order to operate in the electric striking condition E, in association with apparatuses, which provide suitable supply power impulses at high energy for striking the plasma jet.
  • the device By disassembling from the body 2 the second interchangeable electrode 6 and bush 5 members and replacing them with the first interchangeable electrode 4 and bush 3 members, the device works in the pneumatic striking working condition P, in association with a respective apparatus.
  • the device activation involves the entry of the pressured fluid into a cylinder of the pneumatic actuator associated with the mobile element 7, which thus is moved together with the first electrode member 4 that, sliding inside the first bush member 3, progressively translates from the condition of contact C with the nozzle 9 to the condition of maximum distance D from the latter.
  • the first electrode member 4 and the nozzle 9 are subject by the apparatus to an electric potential difference, which causes, thanks to said progressive mutual spacing, the formation of a voltaic arc between them, fit to strike the plasma jet.
  • the device 1 includes a support means 40 with tubular shaped form, having and end fixing portion 41 to the sleeve 25.
  • the end fixing portion 41 includes an inner thread 49 for a corresponding thread 33 of the sleeve 25.
  • the support means 40 made of high thermal conductivity material, has a tapered shape and the diameter of the end, which is opposed to the end fixing portion 41, is smaller than the diameter thereof.
  • the end of the support means 40 having the smaller diameter is provided with a window 42 facing the outlet of the plasma jet of the nozzle 9 and with a plurality of indentations 43 positioned almost radially around the external end of the window 42.
  • the window 42 allows the exit of the plasma and the evacuation of part of the fluid flow coming from the radial openings 26 of the ring nut 24 through the interspace 27.
  • the support means 40 further has a plurality of almost axial through holes 44 which set in flow communication the inner portion of the support means 40 with the outside, for evacuating the remaining part of the fluid flow coming from the interspace 27.
  • the support means 40 is provided with baffle means 45 consisting of an almost conical annular wall having a solid angle ranging between 20° and 60°, preferably around 45°, and whose geometric vertex is inside the device.
  • the baffle means 45 faces the ends of the outlet through holes 44, which flow outwards.
  • the indentations 43 allow the almost radial exit of the portion of the fluid flow spurting through the window 42 and of the vapors, smokes or gas produced by the cut, avoiding to perturb the plasma jet.
  • the outlet through holes 44 in association with the baffle means 45, allow to the remaining portion of the fluid flow to cool the support means 40 and particularly the portion thereof opposed to the end connection portion 41.
  • the baffle means 45 divert said flow, removing it from the cutting area in order to avoid perturbations of the plasma jet.
  • the variant of figures 14 to 16 differs from the variant of figures 11 to 13 in that the support means 40 is constituted by a wall 47 with almost constant thickness and has a set of spacer borders 46 in correspondence of its free end.
  • the end portion 41 of the support means 40 is fixed to the sleeve 25 through an elastic fixed joint carried out by a longitudinal slot 48 of said support means.
  • the main advantage of the present invention is to provide a plasma cutting torch device with pneumatic and electric arc striking capable to operate with apparatuses having electric and pneumatic arc striking by simply replacing some modular elements.
  • a torch also provided with a support means for supporting the element to be cut and provided with an efficient cooling system whose flow does not perturb the plasma jet.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Arc Welding In General (AREA)
EP03010685A 2002-05-14 2003-05-13 Plasmaschneidbrennervorrichtung mit auswechselbaren Elementen für pneumatische und elektrische Bogenentzündung Withdrawn EP1363479A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2002BO000298A ITBO20020298A1 (it) 2002-05-14 2002-05-14 Dispositivo a torcia per taglio al plasma con elementi intercambiabili per innesco pneumatico ed elettrico
ITBO20020298 2002-05-14

Publications (1)

Publication Number Publication Date
EP1363479A2 true EP1363479A2 (de) 2003-11-19

Family

ID=11440144

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03010685A Withdrawn EP1363479A2 (de) 2002-05-14 2003-05-13 Plasmaschneidbrennervorrichtung mit auswechselbaren Elementen für pneumatische und elektrische Bogenentzündung

Country Status (2)

Country Link
EP (1) EP1363479A2 (de)
IT (1) ITBO20020298A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1732368A2 (de) * 2005-06-07 2006-12-13 The Esab Group, Inc. Plasmabrenner mit wechselbaren Elektrodensytemen
KR20190127336A (ko) * 2018-05-04 2019-11-13 황원규 에어 플라즈마 토치

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1732368A2 (de) * 2005-06-07 2006-12-13 The Esab Group, Inc. Plasmabrenner mit wechselbaren Elektrodensytemen
EP1732368A3 (de) * 2005-06-07 2011-04-27 The Esab Group, Inc. Plasmabrenner mit wechselbaren Elektrodensytemen
KR20190127336A (ko) * 2018-05-04 2019-11-13 황원규 에어 플라즈마 토치

Also Published As

Publication number Publication date
ITBO20020298A0 (it) 2002-05-14
ITBO20020298A1 (it) 2003-11-14

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