FR2672529A1 - Method and device for the ignition and the triggering of an oxygen-cutting or descaling reaction - Google Patents

Abstract

The invention relates to a method for simultaneously igniting and triggering an oxygen-cutting reaction and to a device for carrying out the method, comprising a wire and an electrical source giving simultaneously the arc for igniting the flame of the torch, and the rise in temperature of the steel, and allowing the reaction for the oxygen-cutting of the product to be treated.

Description

 The present invention relates to a device for igniting and initiating an oxycutting, cutting, or similar technique.

 It is known for techniques of this type to initiate a combustion reaction of full sheet steel either by direct preheating of the heating flame of a part of the part to the priming temperature or by means of d '' a rod or steel wire preheated faster than the part by the flame of the torch.

 Furthermore, it is known to use flame or electric pilot lights for lighting the heating flame with a torch.

 However, these techniques have certain drawbacks in particular - presence of deformation or crater due to the immobility of the preheating flame, - impossibility of complete and repetitive automation.

 The present invention therefore aims to overcome at least these drawbacks, and consists of an instantaneous and simultaneous ignition and ignition process of the oxygen cutting reaction or the like, and in a device for implementing the method. , device comprising a wire and an electric source giving simultaneously the arc of ignition of the torch flame and the instantaneous rise in the temperature of ignition of the steel allowing in the same instant the reaction of priming of the product to be cut or to treat.

 The advantages of the method and of the device are in particular complete and repetitive automation, gas savings, cleaner work in particular in full-size flame cutting by the absence of the preheating flame.

 The method according to the invention consists in carrying out an oxycutting reaction comprising at least the start-up steps, the initiation of an electric arc for the fusion of a welding wire or similar rod, an ignition of the flame. heating and ignition of the molten wire, characterized in that the start-up order simultaneously causes the ignition of the electric arc, the ignition of the heating flame, the ignition of the molten wire, the advance some thread.

 In addition, the start of the relative flame / room movement is automatic and simultaneous. The device for starting the process is characterized in that it comprises in combination at least - a wire guide tube - a wire reel - a contact tube fixed to the wire guide tube - an electrical substation connected to the contact tube by a conductor - a device for adjusting the opening of the solenoid valves for supplying fuel gas, heating oxygen and oxygen-cutting oxygen respectively - a device for synchronizing the openings of the solenoid valves with the presentation of the end of the wire on the location of the part to be treated and on the relative flame / part displacement.

 The invention will be better understood with the aid of the description which follows, made with reference to the single appended figure which is a block diagram of a device according to the invention.

 The device shown by way of nonlimiting example comprises in combination a cutting torch (1) and a device for preparing and presenting (2) the welding wire.

 The torch (1) is a conventional torch with nozzle (3), main body (4) connected to three fuel gas supplies, heating oxygen, oxygen cutting oxygen by three appropriate solenoid valves (5,6,7).

 The device (2) for preparing-presenting the weld wire is composed at least of - a wire guide tube (8) positioned appropriately to present the end (9) of the weld wire (10) coming from a reel (11) in contact with the part (12) to be treated - a reel (ll) or an equivalent device for advancing the wire (10). The end (9) is thus automatically placed at the precise location where the initiation of the reaction is to take place.

The welding wire (10) is a conventional wire allowing the passage of an electric current such as welding current causing a short circuit arc with the part to be treated - from a contact tube (12), fixed or surrounding the tube wire guide (8) making it possible to pass the electric current through the welding wire (10) - from an electrical station (13) such as a welding current generator capable of causing the electric arc to burst between the end (9) of wire and the part to be treated (12), and connects by a conductor (14) to the contact tube (12) - of a device for adjusting the opening - of the solenoid valves (5,6,7) allowing to synchronize their respective openings with the advance of the wire and the formation of the electric arc - of a device for relative displacement of the torch (ll) and its tip (3) relative to the part (12)
The device operates according to the following process - reception of an order to advance the wire - contact of the end (9) of the wire (10) with the workpiece, automatically causing the welding arc to spring, simultaneously causing the fusion of the wire - simultaneous opening of the solenoid valves (5) and (6) for the ignition of the heating flame, and (7) for the ignition of the molten wire simultaneously causing the initiation of the oxygen cutting reaction of the part - immediate route of the relative torch / piece movement.

 Of course, it will not depart from the scope of protection by replacing elements of the device with technical equivalents, and / or by providing alternative embodiments.

Claims (3)

1. Process for; carrying out an oxycutting reaction or the like comprising at the same time a start-up order, the initiation of an electric arc for the melting of a welding wire or similar rod, an ignition of the heating flame and an ignition of the molten wire characterized in that the start-up order simultaneously causes the ignition of the electric arc, the ignition of the heating flame, the ignition of the molten wire, the advance of the wire.  2. Method according to the preceding claim, characterized in that the order to start the process immediately causes the start of the relative flame / part movement. 3 Device for starting the method according to claim 1, characterized in that it comprises in combination at least - a wire guide tube (8) - a wire feeder (11) (10) - a contact tube ( 12) fixed to the wire guide tube (8) - an electrical station (13) connected to the contact tube (12) by a conductor (14) - a device for adjusting the opening of the supply solenoid valves (5,6,7 ), respectively in fuel gas, in heating oxygen, in oxygen cutting oxygen - a device for synchronizing the openings of the solenoid valves when presenting the end (9) of the wire (10) on the place of the part to be treated and the relative flame / room displacement.