EP0573330B1 - Plasma-Schneidbrenner - Google Patents

Plasma-Schneidbrenner Download PDF

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Publication number
EP0573330B1
EP0573330B1 EP93401350A EP93401350A EP0573330B1 EP 0573330 B1 EP0573330 B1 EP 0573330B1 EP 93401350 A EP93401350 A EP 93401350A EP 93401350 A EP93401350 A EP 93401350A EP 0573330 B1 EP0573330 B1 EP 0573330B1
Authority
EP
European Patent Office
Prior art keywords
trigger
torch
torch according
skirt
plasma
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
EP93401350A
Other languages
English (en)
French (fr)
Other versions
EP0573330A1 (de
Inventor
Gérard Marhic
Christian Maocec
Thierry Berlemont
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.)
Lincoln Electric Company France SA
Original Assignee
La Soudure Autogene Francaise
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 La Soudure Autogene Francaise filed Critical La Soudure Autogene Francaise
Publication of EP0573330A1 publication Critical patent/EP0573330A1/de
Application granted granted Critical
Publication of EP0573330B1 publication Critical patent/EP0573330B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the present invention relates to arc plasma cutting torches comprising a torch body enclosing a plasma generating device comprising a plasma ejection nozzle, an insulating skirt surrounding the nozzle and mounted on one end of the body, and a trigger. movable between an inactive position and an active position to implement the torch.
  • Such a torch is known, for example, from documents US-A-5,039,837 and US-A-4,896,016.
  • Such a torch which is generally held in the hand, is connected to a source of plasma generating gas and to a source of direct current to ensure the ignition of the pilot arc and the operation of the cutting arc, the trigger being actuated to request the start of the cycle, which causes the ignition of the arc between the electrode and the nozzle, and to maintain the cutting arc.
  • the increasing use of this type of torch imposes increased measures to protect the operator from the risks of contact with live parts, in particular during the disassembly and replacement of consumable parts of the plasma generator, in particular the nozzle. .
  • the arrangement of the insulating skirt around the nozzle constitutes one of these measures currently widely adopted.
  • the object of the present invention is to propose a torch of simple, robust and reliable design ensuring a high level of security against the electrical risks likely to be run by the operator.
  • the torch comprises blocking means, manually unlockable, normally preventing movement of the trigger towards its active position.
  • the torch comprises electrical means for detecting the correct positioning of the skirt.
  • a torch body 1 typically constituted by the assembly of two half-shells of plastic material and shaped to present an end part 2 forming a housing for a plasma generating device 3 and a main part 4 shaped like a handle for handling the torch.
  • the plasma generating device 3 for example of the type described in document US-A-3,242,305, Kane et al, essentially comprises an electrode or cathode 5 cooperating with a nozzle forming an anode during the formation of the pilot arc, mounted removably on the working end of the plasma generating device 3.
  • the electrode 5 is mounted in an electrode holder block comprising an end part 7 extending, opposite the nozzle 6, outside the plasma generator device 3 for its connection to an electric line connected to the current generator.
  • the active end of the electrode 5, received in a chamber 8 formed by the nozzle 6, is initially in contact with the latter to ignite the arc and is then separated from the latter to maintain the arc by the pressure of a plasma gas, typically pressurized air, supplied by a gas supply pipe 9 and flowing, via the chamber 8, through a central orifice 10 of the nozzle, forming a plasma jet.
  • a plasma gas typically pressurized air
  • a skirt of plastic material 11 comprising an annular ceramic insert 12 is mounted on the end 2 by a bayonet assembly, so that the insert 12 completely surrounds the nozzle 6.
  • the front face of the skirt 11 has a protrusion 13 received in rotation in an arc-shaped groove 14 in the torch body in which extends axially forward a pusher 15 of a contactor 16 connected to the electrical control system of the torch and is closing when the skirt 11 correctly positioned on the end 2 of the torch body 1.
  • the torch comprises a control trigger 17 articulated, at one of its ends, in the torch body and urged towards its inactive or rest position by a spring blade 18 mounted in cantilever in the handle part 4 and transmitting on the other hand the vacuum movement of the trigger 17 to a pusher 19 of a contactor 20 mounted in the body 1 and connected to the electrical control device of the torch.
  • the trigger 17 carries a cursor 21 comprising an internal actuating part 210 and a protrusion extending inwardly 22 and urged in a trigger blocking position by a spring 23 bearing on the free end of the trigger 17.
  • the protuberance 22 is located opposite a stop 24 formed in the torch body 1 and thus preventing any depression of the trigger 17 tending to actuate the switch 20.
  • the operator to actuate the trigger and control the start of the cycle, the operator must first push the slider 21 against the spring 23 to release the protuberance 22 from the stop 24. Once this stop 24 has been crossed, a slight press on the trigger 17 is enough to actuate the contactor 20, the slider 21 being prevented from returning to its blocking position by the edge of the stop 24 which it has previously crossed.
  • the spring 18 brings the latter back to its inactive position and the cursor 21 is brought back forward, under the effect of the spring 23, thereby bringing the protuberance 22 opposite the the stop 24, thus preventing a further sinking of the trigger without having previously pushed the cursor 21.
  • the torch according to the invention has several levels of security. As soon as the trigger is correctly depressed, a rest or safety voltage (less than 24 V) is applied to the terminals of the initially closed circuit electrode 5 - nozzle 6 to measure the electrical continuity of this circuit. If this circuit turns out to be open (the electrode and / or the nozzle are not mounted in the torch body), the continuation of the cycle is prohibited and no power voltage will be delivered. If the circuit turns out to be closed, the voltage from the power source can be applied to the terminals of the electrode-nozzle circuit when the pneumatic circuit is pressurized. The spacing, under the effect of this pressure, of the electrode 5 relative to the nozzle 6, produces a rupture of the power circuit, which causes the initiating spark of the pilot arc.
  • a rest or safety voltage (less than 24 V) is applied to the terminals of the initially closed circuit electrode 5 - nozzle 6 to measure the electrical continuity of this circuit. If this circuit turns out to be open (the electrode and / or the nozzle are not mounted in the torch body), the continuation of the cycle is
  • the contactor 16 also detects whether the skirt is correctly mounted in position on the torch body to allow the start of the cycle described above. As soon as the skirt is removed for intervention on the active parts of the plasma generator circuit, the contactor 16 opens and prohibits any subsequent operation of the cycle.
  • an electrical control is carried out of the sequence for reassembling the skirt: after reassembly of the wearing parts, if the operator keeps the trigger pressed when he puts the insulating skirt back in place, the generator current automatically goes into safety configuration and signals the fault by lighting up of an indicator or by emitting an audible signal.
  • the operator can choose between two solutions: if he is near the current generator, he turns it off to cause the electrical lock to drop, then he returns it to normal service, or, s 'It is at a distance from the generator, it removes the insulating skirt, which brings down the safety, and reassembles it again, this time making sure that the trigger has returned to the inactive position.
  • the trigger security according to the invention with its blocking slider, makes it possible to maintain a flexibility of normal actuation of the trigger highly appreciated by the users. Indeed, if the trigger is too hard, the muscles of the hand become paralyzed quickly and the precision of the work becomes less good.
  • the trigger return spring 18 can have a relatively low force, so that the actuation of the contactor 20 and its holding closed, once the cursor 22 has been retracted, is obtained by lightly pressing the trigger, not causing excessive operator fatigue.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Arc Welding In General (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Plasma Technology (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (8)

  1. Plasma-Schneidbrenner, mit einem Brennerkörper (1), der eine Plasmaerzeugungsvorrichtung (3), die eine Plasma-Ausstoßdüse (6) aufweist, eine Isolierschürze (11), die die Düse umschließt und an einem Ende (2) des Körpers (1) befestigt ist, und einen Drücker (17) umfaßt, der zwischen einer inaktiven und einer aktiven Position zur Inbetriebnahme des Brenners verschiebbar ist, dadurch gekennzeichnet, daß er eine manuell entriegelbare Blockiereinrichtung (21) aufweist, die normalerweise die Verschiebung des Drückers (17) in seine aktive Position verhindert.
  2. Brenner nach Anspruch 1, dadurch gekennzeichnet, daß die Blockiereinrichtung (21) von dem Drücker (17) gehalten wird.
  3. Brenner nach Anspruch 2, dadurch gekennzeichnet, daß die Blockiereinrichtung einen Schieber (21) aufweist, der in der normalen Ruheposition mit einem Anschlag (24) zusammenwirkt, der mit dem Brennerkörper (1) zusammenwirkt.
  4. Brenner nach Anspruch 3, dadurch gekennzeichnet, daß der Schieber (21) mittels einer Feder (23) in seine normale Ruheposition gedrückt wird.
  5. Brenner nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß der Drükker (17) mit einer Rückhol-Blattfeder (18) zusammenwirkt, die bei Verschiebung des Drückers in seine aktive Position einen Schalter (20) betätigt.
  6. Brenner nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß er elektrische Einrichtungen (15, 16) zur Erfassung der Anbringung der Schürze (11) aufweist.
  7. Brenner nach Anspruch 6, dadurch gekennzeichnet, daß die Schürze (11) einen rohrförmigen Mantel aus Kunststoff mit einer keramischen Auskleidung (12) aufweist.
  8. Brenner nach Anspruch 7, dadurch gekennzeichnet, daß die Erfassungseinrichtung einen Arbeitskontakt (16) aufweist, der in dem Körper (1) befestigt ist und mit einem Teil (13) des Mantels (11) zusammenwirkt.
EP93401350A 1992-06-04 1993-05-27 Plasma-Schneidbrenner Expired - Lifetime EP0573330B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9206760A FR2691920B1 (fr) 1992-06-04 1992-06-04 Torche de coupage a plasma.
FR9206760 1992-06-04

Publications (2)

Publication Number Publication Date
EP0573330A1 EP0573330A1 (de) 1993-12-08
EP0573330B1 true EP0573330B1 (de) 1995-12-20

Family

ID=9430423

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93401350A Expired - Lifetime EP0573330B1 (de) 1992-06-04 1993-05-27 Plasma-Schneidbrenner

Country Status (7)

Country Link
EP (1) EP0573330B1 (de)
AT (1) ATE131992T1 (de)
DE (1) DE69301063T2 (de)
DK (1) DK0573330T3 (de)
ES (1) ES2082605T3 (de)
FR (1) FR2691920B1 (de)
GR (1) GR3018503T3 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109746557B (zh) * 2019-03-22 2023-12-01 常州市海宝焊割有限公司 一种等离子切割枪维弧装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3524034A1 (de) * 1985-07-05 1987-01-08 Wilhelm Dinse Vorrichtung zum plasmaschneiden von metallischen werkstuecken
FR2609591B1 (fr) * 1987-01-13 1990-12-07 Soudure Autogene Francaise Coiffe pour torche de travail a l'arc et torche correspondante
US4959520A (en) * 1988-02-15 1990-09-25 Daihen Corporation Detection means for an electric arc torch nozzle
US4896016A (en) * 1989-04-24 1990-01-23 Century Mfg. Co. Plasma arc metal cutting apparatus with actuation spring
US5039837A (en) * 1990-02-23 1991-08-13 Tescom Corporation Plasma torch head, body, handle and control circuitry

Also Published As

Publication number Publication date
EP0573330A1 (de) 1993-12-08
FR2691920A1 (fr) 1993-12-10
ATE131992T1 (de) 1996-01-15
DK0573330T3 (da) 1996-01-29
DE69301063T2 (de) 1996-05-15
GR3018503T3 (en) 1996-03-31
FR2691920B1 (fr) 1994-07-22
DE69301063D1 (de) 1996-02-01
ES2082605T3 (es) 1996-03-16

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