DD238557A1

DD238557A1 - METHOD AND DEVICE FOR BRENNER SUPPLY TO CUTTING MACHINES

Info

Publication number: DD238557A1
Application number: DD27760585A
Authority: DD
Inventors: Hans-Joachim Telzer; Hans Froehlich; Volker Schauder; Thomas Madl; Hans-Joachim Roloff; Bernd Bauerfeind
Original assignee: Zentralinstitut Schweiss
Priority date: 1985-06-21
Filing date: 1985-06-21
Publication date: 1986-08-27

Abstract

Die Erfindung bezieht sich insbesondere auf das Zuenden eines Gasbrenners fuer Brennschneidmaschinen und -automaten. Ziel ist, die Leistungsfaehigkeit von Gasflammenbearbeitungseinrichtungen zu erhoehen. Nach der Aufgabe sind Massnahmen vorzusehen, die ein sicheres Zuenden von Gasbrennern gewaehrleisten. Erfindungsgemaess wird zwischen dem Gasbrenner und einem diesem gegenueber vorzugsweise isolierten elektrisch leitenden, insbesondere feilen- oder buerstenaehnlichen metallischen Gegenstand eine Niederspannung angelegt, wonach der elektrisch leitende Gegenstand mittels geringer Anpresskraft mit der Duesenmuendung des Gasbrenners in Beruehrung gebracht wird. Vorrichtungsmaessig ist ein Gasbrenner und ein elektrisch leitender Gegenstand miteinander so gekoppelt, dass ein mit dem elektrisch leitenden Gegenstand verbundener Mitnehmer mit einem Anschlag am Gasbrenner im Eingriff steht und der elektrisch leitende Gegenstand ueber mechanische Elemente verfuegt, die ihn bei Betaetigung des Mitnehmers an die Duesenmuendung fuehren, wobei prallel zu einer Niederspannungsquelle zwischen Gasbrenner und elektrisch leitendem Gegenstand vorzugsweise ein Kondensator geschaltet ist. Fig. 1The invention relates in particular to the Zuenden a gas burner for flame cutting machines and machines. The aim is to increase the performance of gas flame processing equipment. After the task, measures must be taken to ensure safe ignition of gas burners. According to the invention, a low voltage is applied between the gas burner and an electrically conductive, in particular filament or brush-like metallic object, which is preferably insulated therefrom, after which the electrically conductive object is brought into contact with the nozzle of the gas burner by means of a low contact pressure. In terms of apparatus, a gas burner and an electrically conductive object are coupled together such that a driver connected to the electrically conductive object is engaged with a stop on the gas burner and the electrically conductive object has mechanical elements which guide it to the engine when the driver is activated in which a capacitor is preferably connected in parallel to a low-voltage source between gas burner and electrically conductive object. Fig. 1

Description

Eine Vorrichtung zur Ausführung des Verfahrens, insbesondere für stationäre Brennschneidmaschinen ist vorzugsweise so gebaut, daß der Gasbrenner oder die Brennerhalterung oder der Brennersupport und der elektrisch leitende Gegenstand mechanisch miteinander gekoppelt sind, wobei diese Kopplung so ausgebildet ist, daß der elektrisch leitende Gegenstand mit einem Mitnehmer verbunden ist, der mit einem Anschlag oder einer Einrastung am Gasbrenner, an der Brennerhalterung oder am Brennersupport in Eingriff steht und daß die Betätigungsrichtung des Mitnehmers vertikal oder horizontal ausgerichtet ist und daß am elektrisch leitenden Gegenstand mechanische Elemente, wie z. B. Gelenke und/oder Schraubengewinde, angeordnet sind, durch die der elektrisch leitende Gegenstand bei Betätigung des Mitnehmers an die Düsenmündung führbar ist und daß parallel zur Niederspannungsquelle zwischen dem Gasbrenners und dem elektrisch leitenden Gegenstand ein elektrischer Energiespeicher, vorzugsweise ein Kondensator oder eine Batterie, geschaltet ist. Die Vorteile der Erfindung bestehen darin, daß mit einfachen mit geringem Aufwand ein sicheres Zünden der Brennerflamme gewährleistet wird, daß der Zündprozeß nicht durch Rußbildung oder die Gefahr von Nebenschlüssen gestört wird und daß Funktionsstörungen elektronischer Geräte in der Umgebung des Gasbrenner nicht auftreten, wobei gleichzeitig bei jedem Zündvorgang die Düsenmündung von technologisch hervorgerufenen Zunder- oder Schlackesatz gereinigt wird durch das Überstreifen des elektrisch leitenden Gegenstandes über die Düsenmündung. Ein weiterer Vorteil der Erfindung ist, daß sich das Zündelement (elektrisch leitfähiger Gegenstand) nicht im Arbeitsbereich des Gasbrenners befindet.An apparatus for carrying out the method, in particular for stationary flame cutting machines is preferably constructed so that the gas burner or the burner holder or the burner support and the electrically conductive object are mechanically coupled to each other, wherein this coupling is formed so that the electrically conductive object with a driver is connected, which is engaged with a stop or a catch on the gas burner, the burner holder or the burner support and that the actuating direction of the driver is aligned vertically or horizontally and that the electrically conductive object mechanical elements, such as. B. joints and / or screw thread, are arranged, through which the electrically conductive object can be guided on actuation of the driver to the nozzle orifice and that parallel to the low-voltage source between the gas burner and the electrically conductive object, an electrical energy storage, preferably a capacitor or a battery is switched. The advantages of the invention are that with simple low-cost safe ignition of the burner flame is ensured that the ignition process is not disturbed by soot or the risk of shunts and that malfunction of electronic devices in the vicinity of the gas burner does not occur, at the same time at Each ignition of the nozzle mouth of technologically induced scale or slag set is cleaned by the stripping of the electrically conductive object via the nozzle orifice. Another advantage of the invention is that the ignition element (electrically conductive object) is not in the working range of the gas burner.

Ausführungsbeispielembodiment

Die Erfindung soll nachstehend an einem Ausführungsbeispiel näher erläutert werden. In der zugehörigen Zeichnung zeigen:The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing show:

Fig. 1: die Ausgangsstellung der Vorrichtung Fig. 2: dieZünstellung der Vorrichtung.Fig. 1: the initial position of the device Fig. 2: the device's opening.

Der Bewegungsablauf des Zündprozesses wird eingeleitet, indem durch einen Befehl der Gasbrenner 1 durch die Supporthubstange 2 über die normale obere Endposition hinausgefahren wird. Dabei wird der Anschlag 3 an der Supporthubstange 2 gegen den Mitnehmer 4 bewegt und bewegt seinerseits in der Hülse 5 die angeordnete Zugstange 6. Durch den im Schlitz 7 der Hülse 5 angeordneten Stift 8 wird der Drehstab 9 zwangsgeführt, so daß gegen die Kraft der Feder 10 der bürstenförmig ausgebildete elektrisch leitende Gegenstand 11 über die Düsenmündung 12 geführt wird in dem mit einer Isolierhalterung 13 an der Supporthubstange 2 befestigten Gasbrenner 1 ist der Pluspol einer Gleichspannungsquelle 14 und 42V angeschlossen. Der Minuspol der Gleichspannungsquelle 14 ist über die Masse von Support 15, Hülse 5, Stift 8, Drehstab 9 mit dem elektrisch leitenden Gegenstand 11 verbunden. Zwischen Plus- und Minuspol der Spannungsquelle 14 ist der Kondensator 16 parallelgeschaltet.The sequence of movements of the ignition process is initiated by driving the gas burner 1 through the support stroke rod 2 beyond the normal upper end position by a command. In this case, the stopper 3 is moved to the support lifting rod 2 against the driver 4 and moves in turn in the sleeve 5, the arranged pull rod 6. By arranged in the slot 7 of the sleeve 5 pin 8 of the torsion bar 9 is positively driven, so that against the force of the spring 10 of the brush-shaped electrically conductive object 11 is guided over the nozzle orifice 12 in the attached with an insulating holder 13 to the support rod 2 gas burner 1, the positive pole of a DC voltage source 14 and 42V is connected. The negative pole of the DC voltage source 14 is connected to the electrically conductive object 11 via the mass of support 15, sleeve 5, pin 8, torsion bar 9. Between plus and minus pole of the voltage source 14, the capacitor 16 is connected in parallel.

Sobald der elektrisch leitende Gegenstand 11 die Düsenmündung 12 berührt, wird hauptsächlich durch die schlagartige Entladung des Kondensators 16 ein Zündfunke an der Berührungsstelle erzeugt, der das Flammengasgemisch, das vor dem Berührungszeitpunkt zugeschaltet wurde, zündet.As soon as the electrically conductive object 11 touches the nozzle orifice 12, a spark is generated at the point of contact, mainly due to the sudden discharge of the capacitor 16, which ignites the mixture of flame gases that was switched on before the contact time.

Claims

Invention claim:

1. A method for burner ignition for flame cutting machines and machines, in particular for igniting a gas burner in fully automatic cutting of sheet metal parts, characterized in that between a gas burner (1) and a preferably electrically insulated, in particular filament or brush-like metallic object (11 ) A low voltage is applied, and that thereafter the electrically conductive object (11) by a relatively small contact force with the nozzle orifice (12) of the gas burner (1) is brought into contact.

2. Apparatus for carrying out the method according to 1, characterized in that the gas burner (1) or the burner holder or the burner support (15) and the electrically conductive object (11) are mechanically coupled together, wherein this coupling is formed so that the electrically conductive object (11) is connected to a driver (4) which is in engagement with a stop (3) or a catch on the gas burner (1), on the burner holder or on the burner support (15) and in that the actuating direction of the driver ( 4) is oriented vertically or horizontally and that the electrically conductive object (11) mechanical elements, such. B. joints and / or screw thread, are arranged, through which the electrically conductive object (11) is guided upon actuation of the driver (4) to the nozzle orifice and that parallel to the low voltage source between the gas burner (1) and the electrically conductive article (11 ) An electrical energy storage, preferably a capacitor (16) or a battery is connected.

For this 2 pages drawings

Field of application of the invention

The invention relates to a method and apparatus for burner ignition for burner cutting machines and machines, in particular for igniting a gas burner in the fully automatic cutting of sheet metal parts.

Characteristic of the known technical solutions

It is known that the ignition of fuel gases by pilot burners, which are operated by means of glow or spark plugs, the pilot burner is attached to the machine cutting torch and thus disadvantageously restricts its working space (DD-PS 95736; 132768; DE-AS 2819108) , The low life of a glow plug adversely affects the reliability of the entire ignition device. The ignition by means of high voltage or high frequency spark plugs is also prone to failure, since by the high degree of contamination during flame cutting and by the pilot burner itself the shunt resistance to the ignition cable decreases, so that a reliable ignition of the gas mixture is no longer guaranteed by outflowing sidestreams. In addition, by the field emission of high frequency or high voltage discharges, the function of electronic devices, e.g. NC controllers, disturbed. This disadvantage is not eliminated by a so-called firing head, which ignites a gas mixture, preferably used in city gas burner. The effluent gas from the gas burner is partially passed through the firing head and should be ignited by flashover of a high voltage in the ignition chamber (DE-OS 1800487).

Furthermore, igniter devices and safety ignition devices of complicated design are known in which the gas mixture is likewise ignited by means of a filament (DE-PS 411271, DE-AS 1955483). It is also known that the nozzles of gas welding and gas cutting burners are soiled during their work process by soot, scale, slag and metal spatter from the material to be processed, so that they must be removed and cleaned at certain intervals and replaced with new ones. The technologically caused and time-increasing pollution affects the processing performance and quality. The nozzle change reduces the effective service life of the flame processing equipment, d. H. especially the flame cutting machines.

Object of the invention

The invention is intended to increase the performance of gas flame processing devices, in particular of methods and devices for gas welding and cutting.

The essence of the invention

The invention has for its object to provide a method and apparatus to develop and provide measures to ensure a safe ignition of gas burners for welding, cutting and similar work, the cost of cleaning the burner nozzles is to be reduced so that previous performance losses such Gas burner devices are largely excluded.

According to the invention the object has been achieved in that between the gas burner and this compared to otherwise insulated electrically conductive preferably filament or brush-like metallic object low voltage is applied and that then brought this electrically conductive object preferably by means of relatively low contact force with the nozzle orifice of the gas burner in touch becomes.