WO1996018071A1 - Oxy-cutting torch - Google Patents

Oxy-cutting torch Download PDF

Info

Publication number
WO1996018071A1
WO1996018071A1 PCT/FR1995/001572 FR9501572W WO9618071A1 WO 1996018071 A1 WO1996018071 A1 WO 1996018071A1 FR 9501572 W FR9501572 W FR 9501572W WO 9618071 A1 WO9618071 A1 WO 9618071A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
heating
torch
oxygen
head
Prior art date
Application number
PCT/FR1995/001572
Other languages
French (fr)
Inventor
Michel Donze
Guy Prioretti
Joseph Scavetta
Original Assignee
Michel Donze
Guy Prioretti
Joseph Scavetta
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 Michel Donze, Guy Prioretti, Joseph Scavetta filed Critical Michel Donze
Priority to AU42650/96A priority Critical patent/AU4265096A/en
Publication of WO1996018071A1 publication Critical patent/WO1996018071A1/en

Links

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
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/52—Nozzles for torches; for blow-pipes
    • F23D14/54—Nozzles for torches; for blow-pipes for cutting or welding metal

Definitions

  • the present invention relates to flame cutting torches.
  • torches known up to now comprise a nozzle having a cutting orifice and several heating orifices.
  • the cutting hole ensures the flow of cutting oxygen to the workpiece.
  • the heating orifices allow the workpiece to be heated by means of the combustion of a combustible gas in heating oxygen.
  • the state of the art is illustrated by the documents DE-A-14 29 136, FR-A-444 349, DE-C-249 170, DE-B-12 09 973 and FR-E-9 375.
  • the different parts required to bring these three gas streams to the nozzle are joined by welding or brazing to form a robust one-piece assembly.
  • the conduits supplying these orifices are in communication with sources of oxygen and gas.
  • the nozzle delimiting the downstream portions of the supply lines and having the aforementioned orifices, is often made in one piece. In some cases, elements have been fitted into one another (see DE-A-14 29 136) or juxtaposed and connected together by a removable collar (see FR-A-444 349).
  • the nozzles are easily deteriorated. In particular, some of the orifices can be blocked by projections of molten liquid. It is generally necessary to completely replace the torch nozzle and replace it with a new nozzle.
  • the invention aims to produce a torch whose maintenance can be ensured in a very short period of time, by means of inexpensive machined parts and having the desired precision so that they can be installed on the torch with a reliable positioning.
  • the invention thus relates to an oxycou ⁇ page torch comprising at least one end forming an oxygen-cutting member which has at least one cutting orifice and heating orifices, at least one supply duct for the communicating cutting orifice with an oxygen source, and supply lines for the heating orifices communicating with the oxygen source and with a source of fuel gas.
  • the cutting orifice and the duct which supplies it are delimited by a cutting element associated with this end, and the heating orifices and the ducts which supply them are delimited by a heating element associated with this end, the cutting element being distinct and separable from the heating element, the cutting and heating elements being secured by means of at least one removable connection and defining at at least in part said end forming an oxycou ⁇ page member.
  • end forming an oxycou ⁇ page member here designates in the broad sense a part of the torch ensuring the functions of heating and supplying cutting oxygen and carrying out the oxycutting of a part.
  • the cutting end comprises several heating orifices and one or more cutting orifices.
  • the torch may include several ends forming an oxycutting member, arranged in a series alignment, for example along an axis.
  • the heating and cutting functions are ensured by dissociable elements, secured to one another directly or by means of a or several other pieces. If one of the torch orifices is defective, it suffices to dismantle the connection ensuring the fixing to the torch of the element having this orifice and to replace this element with a new one. Only the defective part is then replaced, which reduces the cost of maintenance.
  • connection being removable, this replacement can be carried out very quickly, without requiring the production line or cutting to be stopped.
  • This will, for example, be a dog-type connection, an interlocking or a fixing by wedging.
  • the change of the defective element can even be automated.
  • the cutting and heating elements are distinct, they can each be made of materials adapted to their own function and to any manufacturing constraints which result therefrom.
  • the heating element performs the burner function and not the cutting function, it can be made from a heat-resistant material without precise machining tolerances being required
  • the cutting element is relatively little subjected to heat but must be machined to be precisely positioned in order to ensure good cutting precision, so that a easily machinable material will suffice to make this cutting element.
  • the invention makes it possible to choose the materials and the manufacturing methods according to the function of each of the elements concerned and its conditions of use. The manufacturing costs of spare parts are therefore reduced.
  • the cutting and heating elements communicate with their respective sources of oxygen and fuel gas supply by means of removable connectors.
  • the cutting element comprises a cutting head having an oxygen election nozzle, this head defining a portion of the end forming an oxygen cutting member and being secured to the part remaining of the cutting element by means of a removable connection.
  • At least one of the heating elements comprises a heating head having the heating orifices, this head defining a portion of the end forming an oxygen-cutting member and being secured to the remaining part of the heating element by means of 'a removable link.
  • This version provides benefits similar to those of the previous version.
  • the use of an indistinctly machined heating head is no longer penalizing at all, since it can be ensured that this heating head does not perform any function relating to the precision of the cup.
  • the copper heating head will be produced, for example.
  • the heating head has the shape of a crown and is arranged coaxially with the cutting head so that the heating head and the cutting head define respectively peripheral and central portions of the end forming an oxygen cutting member.
  • This version shows that the production of the chalu ⁇ meau by means of a cutting element and a separable heating element is perfectly compatible with obtaining a torch provided with an end forming an oxycutting member of conventional type. , having heating orifices at the periphery of the cutting orifice.
  • the torch in which the torch is designed to be movable during flame cutting in a given direction relative to the workpiece, at least some of the heating orifices are located upstream of the cutting orifices with reference to the aforementioned direction.
  • the heating element here performs its function at least partially upstream of the cutting element.
  • Several cutting openings can be arranged downstream in order to make several cuts, from this common heating of the room. Indeed, it is advantageous to have several cutting orifices for cutting thick pieces and in order to obtain a relatively flat cut edge.
  • At least one of the cutting orifices is then installed so that its oxygen current forms with the vertical current from another orifice an angle in the plane of movement of the torch. The inclined current orifice thus performs the cut in the vertical extension of the cut made by the vertical current orifice.
  • the torch further comprises a separate torch body which can be separated from the cutting and heating elements, the removable links then joining the cutting element to the body and the heating element to the body.
  • a torch body which alone supports a large part of the machining constraints linked to the fixing and positioning of the cutting and heating elements.
  • This body will for example be made of steel, an easily machinable material.
  • the only machining constraints on the cutting and heating elements are then those relating to their connection to the body.
  • the cost of spare parts is therefore further reduced.
  • the body has at least one housing for receiving and supporting a cutting or heating element as mentioned above, this housing ensuring both the positioning and the removable fixing of the element to the body.
  • This device allows particularly quick and easy replacement of the element in question. he can for example be a conical housing.
  • the torch comprises several ends forming an oxygen cutting member, the heating and cutting elements being integral with a single torch body.
  • FIG. 1 is an axial sectional elevation view of a first embodiment of the invention, -
  • FIG. 1 is a bottom view of the torch of Figure 1;
  • FIG. 3 is a schematic view in axial section in elevation of a second embodiment of the invention
  • - - Figure 4 is a view in axial section in elevation of a third embodiment of the invention
  • FIG. 5 is a sectional view of the torch of Figure 4 along the plane V-V;
  • FIG. 6 is an axial sectional elevation view of a fourth embodiment of the invention.
  • FIG. 7 is a sectional view of the torch of Figure 6 along the plane VII-VII without the cutting element 136.
  • FIGS. 1 and 2 show a first embodiment of the flame cutting torch according to the invention, used, like the following, in the steel industry for cutting a steel plate 2.
  • the torch 1 in this case comprises an end forming an oxygen-cutting member 4, in particular visible from below in FIG. 2.
  • This end 4 has a cutting orifice 6 and heating orifices 8.
  • the torch also has a duct supply 10 of the cutting orifice 6.
  • This conduit 10 communicates with a source of oxygen not shown.
  • the torch 1 also has supply conduits 12 and 14 for the heating orifices 8, these conduits communicating respectively with the source of oxygen and with a source of fuel gas which is not shown.
  • the cutting orifice 6 and the conduit 10 which feeds it are delimited by a cutting element 16 associated with the end forming an oxygen-cutting member 4.
  • the cutting element 16 communicates with the power supply in oxygen by means of a removable connection 24.
  • the cutting element 16 comprises a tube 22 delimiting the upstream portion of the conduit 10 and carrying the removable connector 24 for the connection of the cutting element 16 to the oxygen supply source.
  • the cutting element 16 also includes a cutting head 26 having the orifice 6 which is in this case an oxygen ejection nozzle.
  • a conduit 17 of the cutting head 26 puts the nozzle 6 in communication with the tubing 22.
  • the head 26 defines a portion of the end forming an oxy ⁇ cutting member 4.
  • the head 26 is secured to the remaining part of the 'cutting element 16, in this case the conduit 22, by means of a removable connection, for example a screw-nut connection.
  • the duct 22, the head 26 and the nozzle 6 are coaxial with a common axis 28 and preferably have a circular cross section.
  • the nozzle 6 is of conical shape.
  • the cutting head 26 is for example made of ceramic.
  • the heating orifices 8 and the conduits 12, 14 which supply them are delimited by a heating element 18 associated with the end 4.
  • the heating element 18 communicates with its respective sources of oxygen and fuel gas supply to the by means of removable connectors 30 and 32.
  • the removable couplings 24, 30, 32 are for example of the safety quick coupling type.
  • the heating element 18 comprises two pipes 34, 36 delimiting the upstream portions of the conduits 12, 14 for supplying oxygen and fuel gas to the heating element 18. These pipes 34, 36 carry the aforementioned respective removable connectors 30, 32 for the connection of the element 18 to said power sources.
  • the heating element 18 further comprises a heating head 38 having the heating orifices 8. This head 38 defines a portion of the end forming an oxygen cutting member 4. It is secured to the remaining part of the heating element. heats 18, here the pipes 34, 36, by means of a removable connection which is for example a screw-nut connection.
  • the heating head 38 has here the shape of a crown.
  • the orifices 8 form a circle on the underside of the heating head 38, as shown in FIG. 2.
  • the heating head 38 comprises an inner toroidal annular chamber 40, communicating with the pipes 34, 36 for mixing the heating oxygen and fuel gas in the chamber 40 and the mixture supply of the orifices 8.
  • the heating head 38 is preferably made of copper.
  • the cutting element 16 is distinct and separa ⁇ ble from the heating element 18, and the cutting elements 16 and heating element 18 are secured by means of at least one connection removable.
  • the cutting elements 16 and heating elements 18 def ⁇ ne at least partially the end forming an oxygen-cutting member 4.
  • the cutting elements 16 and heating elements 18 define this end 4 alone.
  • the heating head 38 is arranged coaxially with the cutting head 26, so that the heating head and the cutting head define the respectively peripheral and central portions of the end forming an oxygen-cutting member 4
  • the torch 1 further comprises a torch body 46 distinct and separable from the cutting 16 and heating elements 18.
  • the body 46 in this case has a generally annular shape coaxial with the cutting and heating elements.
  • the removable connections securing the cutting element 16 to the heating element 18 are constituted by a removable connection securing the cutting element 16 directly to the body 46 and the heating element 18 directly to the body 46
  • These two removable links are constituted here by crabot ⁇ links.
  • a cylindrical outer face 42 of the cutting head 26 and a cylindrical inner face 44 of the body 46 carry tenons and notches not shown constituting the first connection by dogs, - likewise a conical outer face 48 of the body 46 and a conical inner face 54 of the heating head 38 carry pins and notches not shown constituting the second connection by crabot ⁇ , the two cones in question being coaxial and having the same angle at the top.
  • a conical outer face 50 of the cutting head 26 and a conical inner face 52 of the body 46 abut one against the other, the two cones in question being coaxial and having the same angle at the Mountain peak.
  • the cutting element 16 and the cutting element heaters 18 are secured to each other, via the body 46, via their respective heads 26, 38.
  • the faces 44 and 52 of the body define a housing for receiving and supporting the head 26 of the cutting element 16, this housing ensuring both the positioning and the removable fixing of the cutting element 16 to the body 46.
  • the pipes 34 and 36 pass through the body 46 parallel to the axis 28 passing through channels 56.
  • the torch body 46 extends partly outside the torch to allow the torch 1 to be fixed on a predetermined support 58 via the body 46.
  • This support 58 is for example a conventional tool holder.
  • the torch body 46 is preferably made of steel.
  • blowtorch which has just been described operates in the following manner.
  • the pipes 34 and 36 supply the heating head 38 respectively with heating oxygen and fuel gas. These two fluids mix in the annular chamber 40. The mixture thus produced escapes through the orifices 8 where it is consumed, producing flames orien ⁇ ted towards the workpiece 2, according to the surface of a cone d 'axis 28 of vertex facing part 2.
  • the tubing 22 supplies the cutting head 26 with cutting oxygen. This escapes through the nozzle 6 to be projected towards the part of the part 2 heated by the orifices 8 to make the cut.
  • the assembly of the torch is carried out for example in the following manner.
  • the tubing 22 is connected to the cutting head 26 to constitute the cutting element 16.
  • the heating head 38 is rusted on the body 46.
  • the tubing 34, 36 in the channels 56 those are locked. -this at the heating head 38 to constitute the heating element 18.
  • the locking head is locked section 26 on the body 46 to fix the cutting element to the body 46.
  • the connections 24, 30, 32 are connected to the respective pipes 22, 34, 36 and to the corresponding power sources. If any of the parts constituting the torch 1 is damaged, for example the cutting head 26 or heating head 38, its disassembly and replacement can be carried out immediately. Replacing the only defective part provides a working torch.
  • All the parts, in particular the cutting head 26, the heating head 38 and the body 46, can be produced from the materials and according to the modes best suited to the situation.
  • the heating head 38 does not perform any function relating to the precision of the cut. A loosely dimension tolerance may therefore suffice.
  • the body 46 ensures the fixing and adjustment of the cutting head 26. Its dimension tolerances will therefore be very precise, which does not pose any difficulty in production since the body 46 is here made of steel.
  • the cutting head 26 may have a lateral duct 51, drawn in dotted lines, leading to the end forming an oxygen-cutting member 4 through an orifice 55, and to the upper face of the cutting head 26 to be connected to the fuel gas source there, via a conduit 53 also drawn in dotted lines.
  • the end forming the flame-cutting member 4 is thus provided with a pure fuel gas orifice, the addition of which, in addition to the oxygen mixture of fuel gas heater supplied by the orifices 8, can constitute an advantage in certain applications.
  • FIG. 3 shows a second embodiment very close to the first, in which the identical references designate the same components.
  • the torch 3 comprises several ends forming an oxygen cutting member 4a, 4b, 4c, in this case three. Each end 4a, 4b, 4c is in all points similar to the end 4 of the first embodiment.
  • the only difference between the torch 1 and the torch 3 lies in the fact that the three cutting elements 16 and the three heating elements 18 are integral with a single torch body 60, common to the three ends 4a, 4b, 4c.
  • the cutting and heating elements are connected to the body 60 by removable links identical to those of the previous embodiment.
  • the torch 3 is supported via its body 60 by a tool holder 62.
  • Such a torch allows for example to make several cuts simultaneously in the vertical extension of one another to cut a thick piece more quickly , as explained in the preamble to this application.
  • the axis 28c thus inclined is shown in dotted lines.
  • the end 4c then performs the cut in the extension of the cut made by the end 4b.
  • FIGS. 4 and 5 show a third embodiment of the invention in which the similar elements have the same references.
  • the torch 5 comprises one end forming an oxygen cutting member 64 having a central cutting orifice 66 and a peripheral heating orifice 68.
  • the torch 5 comprises a cutting element 70 comprising a nozzle forming a cutting head 72 which has the cutting orifice 66, and a tube 74 which constitutes the supply conduit for the cutting orifice 66.
  • the torch 5 also includes a heating element 76. This comprises a hollow nozzle forming a heating head 78, the downstream portion 80 has a conical shape and the upstream portion 84 a cylindrical shape.
  • the heating element also comprises a veil 82 arranged transversely to the nozzle 78 and fixed to its upstream cylindrical portion 84.
  • a disc 85 is also fixed transversely to the pipe 74 of the cutting element 70.
  • the heating element 76 also comprises two pipes 86 and 88 parallel to the axis 87, which constitute the supply conduits for the heating orifice 68 in heating oxygen and fuel gas respectively.
  • the downstream end 90 of the pipes 86, 88 passes through the web 82 to open into the nozzle 78.
  • the upstream end 92 of the pipes 86, 88 crosses the disc 85 to open up outside the torch.
  • the pipes 74, 86, 88 carry at their upstream end removable connectors 24, 30, 32 as mentioned above for the connection of the cutting elements 70 and the heating elements 76 to the supply sources of the torch. As shown in FIG. 5, the tubes 74, 86, 88 carry at their upstream end removable connectors 24, 30, 32 as mentioned above for the connection of the cutting elements 70 and the heating elements 76 to the supply sources of the torch. As shown in FIG. 5, the tubes 74, 86, 88 carry at their upstream end removable connectors 24, 30, 32 as mentioned above for the connection of the cutting elements 70 and the heating elements 76 to the supply sources of the torch. As shown in FIG. 5, the tubes 74,
  • the torch 5 also comprises an elongated cylindrical sleeve 100 extending from the disc 85 to the upstream cylindrical portion 84 of the nozzle 78.
  • the web 82 is fixed to the nozzle 78 by tightening inside the portion cylindrical 84.
  • the nozzle 78 is fixed to the sheath 100 by clamping inside the latter.
  • the parts constituting the torch 5 are preferably made of steel, with the exception of the nozzle 78 which is made of copper.
  • the cutting elements 70 and the heating elements 76 alone define said end forming an oxygen cutting member 64, by means of the nozzle 72 and the nozzle 78.
  • the nozzle forming the heating head 78 has the shape of a crown and is arranged coaxially with the nozzle forming the cutting head 72, so that the heating head 78 and the cutting head 72 define respectively peripheral and central portions of the end forming an oxygen cutting member 64.
  • the hollow nozzle 78 delimits an enclosure 79 supplied by the tubes 86 and 88, in which the heating oxygen and the fuel gas are mixed. This mixture is consumed at the heating orifice 68 of the extremity forming an oxygen-cutting member 64 to heat the part to be cut. This heating occurs at the periphery of the orifice 66 for ejecting the cutting oxygen.
  • the tubes 74, 86, 88 are engaged in the corresponding notches 94, 96, 98 of the disc 85.
  • This disc is introduced at the upstream end of the sheath 100 to fix it there by clamping.
  • the nozzle is introduced at the downstream end of the sheath 100 in order to fix it there by tightening, the veil 82 receiving the pipes 74, 86, 88 through its orifices.
  • the torch is dismantled by performing the same operations in reverse order. You can freely change a defective part of the torch without this change being long or expensive. Thanks to its elongated shape, this torch is suitable for making cuts in places that are difficult to access.
  • FIGS. 6 and 7 show a fourth embodiment of the invention.
  • the torch 7 includes a heating element
  • the latter comprises a heating head 112 of generally parallelepiped shape.
  • the heating head has a cylindrical recess 114 opening at the upstream face 116 of the head 112.
  • This recess contains a porous coaxial cylindrical sleeve 118 open at its upstream axial end 120, located on the side of the face 116, and closed at the other axial end 122 of the sleeve 118.
  • the sleeve 118 is connected at its upstream axial end 120 to a conduit 124.
  • This conduit 124 is connected in a manner not shown to a mixing chamber supplied itself by means of removable connectors, similar to those of the previous modes, to a source heating oxygen and a source of fuel gas.
  • the sleeve 118 is thus supplied with an oxygen mixture of fuel gas heaters.
  • the heating head 112 and the sleeve 118 constitute the heating element 110.
  • the heating head 112 has on its lower face 126 two symmetrical rows of heating orifices 130, here eight in number per row. These orifices 130 place the lower face 126 in communication with the porous sleeve 118 which supplies them with an oxygen-fuel gas mixture.
  • the heating head 112 could alternatively include burners of the conventional type, with the oxygen-gas fuel mixture being produced in the burner head.
  • the torch 7 also comprises a body 132 of generally parallelepiped shape, extending in the extension of the heating head 112.
  • the body 132 is fixed to the heating head by means of a removable connection formed here by a projection 133 of the body 132 fits both in a notch 135 of the heating head 112 with a tight fit. We can however use any other type of removable link.
  • the body 132 has three housings 134a, 134b, 134c for receiving and supporting a cutting or heating element, so that each housing ensures both the positioning and the removable fixing of this element to the body 132.
  • these housings 134a , 134b, 134c are intended to receive a cutting element such as that 136 shown in the housing 134a.
  • Each housing has a cone shape with a vertical axis 138 orthogonal to the axis 154 of the sleeve 118, the tip of the cone being oriented downwards.
  • Each housing is extended by a nozzle 140 having the shape of a cone coaxial with the housing and the point of which is turned upwards so that the two cones interpenetrate and are truncated at their point.
  • the cutting element 136 comprises a cutting head 142 of conical outer shape having the same angle at the top as the cone of the housing 134a in order to fit perfectly inside the housing 134a.
  • the cutting element 136 is automatically positioned when it is inserted into the housing 134a.
  • Means for fixing the cutting element 136 to the body 132 may possibly be provided.
  • the cutting head 142 is crossed along the axis of the cone by a conduit 144 ending in pre-nozzle 146 at the downstream end 143 of the head 142.
  • the head 142 is supplied at its upstream end 148 by a tube 150 connected to a oxygen source by means of a removable connection 152 which is here a connection by quick coupling.
  • the pre-nozzle 146 defines a cutting orifice.
  • the end forming an oxygen-cutting member 158 of the torch 7 is therefore constituted by the lower face 126 of the heating head 112, the lower face 156 of the body 132 and the downstream end 143 of the cutting element 136, or cutting elements if several are installed. It is therefore here the body 132 and the cutting elements 136 and the heating elements 110 which define the end forming an oxygen-cutting member 158.
  • the heating head 112 is preferably made of steel, as is the body 132 and the head cutting 142.
  • the torch 7 is designed to be movable during flame cutting in a given direction relative to the workpiece. This direction is indicated in FIG. 6 by the arrow F oriented parallel to the axis 154 of the sleeve 118. Thus, the heating orifices 130 are located upstream of the cutting orifices 146 with reference to the direction of the arrow F.
  • the portion of the part to be cut is therefore heated beforehand by the heating orifices 130. It is then flame cut by the cutting element 136 which projects the cutting oxygen through the nozzle 140.
  • Each housing 134a, 134b, 134c can receive, as required, a cutting or heating element or be left empty.
  • a cutting or heating element can receive, as required, a cutting or heating element or be left empty.
  • heating element and / or the cutting element or elements can be replaced at will if they are defective.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

Oxy-cutting torch comprising at least one end forming an oxy-cutting means, said end including a cutting opening (6), heating apertures (8) and associated feeding channels. According to the invention, the cutting opening (6) and associated feeding channel are delimited by a cutting member (16) while said heating apertures (8) and associated feeding channels are delimited by a heating element (18), said cutting member (16) being discrete and separable therefrom. The cutting member and heating element (16), which define said oxy-cutting end (4), are further attached by a separable connection.

Description

Chalumeau d'oxycoupage Oxygen cutting torch
La présente invention concerne les chalumeaux d'oxycoupage.The present invention relates to flame cutting torches.
La plupart des chalumeaux connus jusqu'à présent comprennent une buse présentant un orifice de coupe et plusieurs orifices de chauffe. L'orifice de coupe assure l'amenée du courant d'oxygène de coupe jusqu'à la pièce. Les orifices de chauffe permettent le chauffage de la pièce à couper au moyen de la combustion d'un gaz combustible dans de l'oxygène de chauffe. L'état de la technique est illustré par les documents DE-A-14 29 136, FR-A-444 349, DE-C-249 170, DE-B-12 09 973 et FR-E-9 375.Most of the torches known up to now comprise a nozzle having a cutting orifice and several heating orifices. The cutting hole ensures the flow of cutting oxygen to the workpiece. The heating orifices allow the workpiece to be heated by means of the combustion of a combustible gas in heating oxygen. The state of the art is illustrated by the documents DE-A-14 29 136, FR-A-444 349, DE-C-249 170, DE-B-12 09 973 and FR-E-9 375.
Les différentes pièces nécessaires à l'amenée de ces trois courants gazeux jusqu'à la buse sont solidarisées par soudure ou brasure pour constituer un ensemble monobloc robuste. Les conduits alimentant ces orifices sont en communication avec des sources d'oxygène et de gaz. La buse, délimitant les portions aval des conduits d'alimen¬ tation et présentant les orifices précités, est souvent constituée d'un seul tenant. Dans certains cas, on a prévu des éléments emboîtés l'un dans l'autre (voir DE-A- 14 29 136) ou juxtaposés et reliés entre eux par un collier démontable (voir FR-A-444 349) .The different parts required to bring these three gas streams to the nozzle are joined by welding or brazing to form a robust one-piece assembly. The conduits supplying these orifices are in communication with sources of oxygen and gas. The nozzle, delimiting the downstream portions of the supply lines and having the aforementioned orifices, is often made in one piece. In some cases, elements have been fitted into one another (see DE-A-14 29 136) or juxtaposed and connected together by a removable collar (see FR-A-444 349).
Dans certaines conditions d'utilisation des chalumeaux telles que celles rencontrées dans les installa¬ tions sidérurgiques, les buses sont facilement détériorées. Notamment, certains des orifices peuvent être bouchés par des projections de liquide en fusion. Il est en général nécessaire de changer en totalité la buse du chalumeau et de la remplacer par une buse neuve.Under certain conditions of use of the torches such as those encountered in steel installations, the nozzles are easily deteriorated. In particular, some of the orifices can be blocked by projections of molten liquid. It is generally necessary to completely replace the torch nozzle and replace it with a new nozzle.
Cela s'avère pénalisant pour plusieurs raisons.This is penalizing for several reasons.
Tout d'abord, la simple obstruction d'un seul des orifices entraîne le changement de l'ensemble de la buse, même si les autres orifices fonctionnent correctement, ce qui alourdit les coûts de maintenance. Ensuite, le changement de buse est long à effectuer si bien qu'il requiert dans certains cas l'arrêt de la ligne de production sur laquelle est installée la buse, ce qui est également coûteux. Enfin, la buse étant exposée à la chaleur et assurant la fonction de brûleur, elle est souvent fabriquée en alliage cuivreux. Ces matériaux ont une mauvaise résistance mécanique et se prêtent très mal à l'usinage. Les buses de rechange coûtent donc cher à fabriquer. En outre, l'impossibilité de respec¬ ter des cotes très fines dans l'usinage des buses peut provoquer des problèmes de coaxialité lors de l'installa¬ tion de la buse sur le chalumeau. Compte tenu des problèmes de tolérance de coupe, un changement de buse peut parfois entraîner le rebut de la pièce subissant la coupe.First of all, the simple obstruction of only one of the orifices leads to the change of the whole of the nozzle, even if the other orifices are functioning correctly, which increases the maintenance costs. Then change nozzle is long to perform so that in some cases it requires stopping the production line on which the nozzle is installed, which is also expensive. Finally, the nozzle being exposed to heat and ensuring the function of burner, it is often made of copper alloy. These materials have poor mechanical strength and are very unsuitable for machining. Replacement nozzles are therefore expensive to manufacture. In addition, the impossibility of respecting very fine dimensions in the machining of the nozzles can cause coaxiality problems during the installation of the nozzle on the torch. Given the tolerance of cutting problems, a change of nozzle can sometimes lead to the reject of the part undergoing cutting.
C'est pourquoi l'invention a pour but de réaliser un chalumeau dont la maintenance puisse être assurée en une période de temps très courte, au moyen de pièces usinées peu coûteuses et présentant la précision souhaitée afin de pouvoir être installées sur le chalumeau avec un position¬ nement fiable. L'invention concerne ainsi un chalumeau d'oxycou¬ page comprenant au moins une extrémité formant organe d'oxycoupage qui présente au moins un orifice de coupe et des orifices de chauffe, au moins un conduit d'alimentation de l'orifice de coupe communiquant avec une source d'oxy- gène, et des conduits d'alimentation des orifices de chauffe communiquant avec la source d'oxygène et avec une source de gaz carburant.This is why the invention aims to produce a torch whose maintenance can be ensured in a very short period of time, by means of inexpensive machined parts and having the desired precision so that they can be installed on the torch with a reliable positioning. The invention thus relates to an oxycou¬ page torch comprising at least one end forming an oxygen-cutting member which has at least one cutting orifice and heating orifices, at least one supply duct for the communicating cutting orifice with an oxygen source, and supply lines for the heating orifices communicating with the oxygen source and with a source of fuel gas.
Selon l'invention, l'orifice de coupe et le conduit qui l'alimente sont délimités par un élément de coupe associé à cette extrémité, et les orifices de chauffe et les conduits qui les alimentent sont délimités par un élément de chauffe associé à cette extrémité, l'élément de coupe étant distinct et separable de l'élément de chauffe, les éléments de coupe et de chauffe étant solidarisés au moyen d'au moins une liaison démontable et définissant au moins en partie ladite extrémité formant organe d'oxycou¬ page.According to the invention, the cutting orifice and the duct which supplies it are delimited by a cutting element associated with this end, and the heating orifices and the ducts which supply them are delimited by a heating element associated with this end, the cutting element being distinct and separable from the heating element, the cutting and heating elements being secured by means of at least one removable connection and defining at at least in part said end forming an oxycou¬ page member.
L'expression "extrémité formant organe d'oxycou¬ page" désigne ici au sens large une partie du chalumeau assurant les fonctions de chauffe et d'apport d'oxygène de coupe et effectuant l'oxycoupage d'une pièce. Par exemple, l'extrémité de coupe comprend plusieurs orifices de chauffe et un ou plusieurs orifices de coupe. Le chalumeau peut comprendre plusieurs extrémités formant organe d'oxycou- page, disposées selon un alignement en série par exemple suivant un axe.The expression "end forming an oxycou¬ page member" here designates in the broad sense a part of the torch ensuring the functions of heating and supplying cutting oxygen and carrying out the oxycutting of a part. For example, the cutting end comprises several heating orifices and one or more cutting orifices. The torch may include several ends forming an oxycutting member, arranged in a series alignment, for example along an axis.
Dans le chalumeau selon l'invention, pour chaque extrémité formant organe d'oxycoupage, les fonctions de chauffe et de coupe sont assurées par des éléments disso- ciables, solidarisés l'un à l'autre directement ou par l'intermédiaire d'une ou plusieurs autres pièces. Si l'un des orifices du chalumeau est défectueux, il suffit donc de démonter la liaison assurant la fixation au chalumeau de l'élément présentant cet orifice et de remplacer cet élément par un élément neuf. On remplace alors seulement la partie défectueuse, ce qui réduit le coût de la maintenan¬ ce.In the torch according to the invention, for each end forming an oxygen cutting member, the heating and cutting functions are ensured by dissociable elements, secured to one another directly or by means of a or several other pieces. If one of the torch orifices is defective, it suffices to dismantle the connection ensuring the fixing to the torch of the element having this orifice and to replace this element with a new one. Only the defective part is then replaced, which reduces the cost of maintenance.
Par ailleurs, la liaison étant démontable, ce remplacement peut être effectué très rapidement, sans nécessiter l'arrêt de la ligne de production ni de la coupe. Il s'agira par exemple d'une liaison par crabots, d'un emboîtement ou d'une fixation par coincement. Le chan¬ gement de l'élément défectueux peut même être automatisé. Enfin, étant donné que les éléments de coupe et de chauffe sont distincts, ils peuvent être chacun fabri¬ qués dans des matériaux adaptés à leur fonction propre et aux éventuelles contraintes de fabrication qui en décou¬ lent. Par exemple, comme l'élément de chauffe assure la fonction de brûleur et non pas la fonction de coupe, on pourra le réaliser dans un matériau résistant à la chaleur sans que des tolérances précises d'usinage soient requises Au contraire, l'élément de coupe est relativement peu soumis à la chaleur mais doit être usiné pour être posi¬ tionné précisément afin d'assurer une bonne précision de coupe, de sorte qu'un matériau facilement usinable suffira pour réaliser cet élément de coupe.In addition, the connection being removable, this replacement can be carried out very quickly, without requiring the production line or cutting to be stopped. This will, for example, be a dog-type connection, an interlocking or a fixing by wedging. The change of the defective element can even be automated. Finally, given that the cutting and heating elements are distinct, they can each be made of materials adapted to their own function and to any manufacturing constraints which result therefrom. For example, as the heating element performs the burner function and not the cutting function, it can be made from a heat-resistant material without precise machining tolerances being required On the contrary, the cutting element is relatively little subjected to heat but must be machined to be precisely positioned in order to ensure good cutting precision, so that a easily machinable material will suffice to make this cutting element.
Ainsi, l'invention permet de choisir les maté¬ riaux et les modes de fabrication suivant la fonction de chacun des éléments concernés et de ses conditions d'utili- sation. Les coûts de fabrication des pièces de rechange sont donc réduits.Thus, the invention makes it possible to choose the materials and the manufacturing methods according to the function of each of the elements concerned and its conditions of use. The manufacturing costs of spare parts are therefore reduced.
Selon une version avantageuse de l'invention, les éléments de coupe et de chauffe communiquent avec leurs sources d'alimentation respectives en oxygène et en gaz carburant au moyen de raccords démontables.According to an advantageous version of the invention, the cutting and heating elements communicate with their respective sources of oxygen and fuel gas supply by means of removable connectors.
Le fait de disposer de raccords démontables permet d'accélérer sensiblement encore le processus de remplacement d'un des éléments de coupe ou de chauffe. Ces raccords peuvent être de type classique, par exemple des raccords rapides de sécurité.The fact of having removable connections makes it possible to considerably speed up the process of replacing one of the cutting or heating elements. These fittings may be of the conventional type, for example quick safety fittings.
Selon une version avantageuse de l'invention, l'élément de coupe comprend une tête de coupe présentant une tuyère d'élection de l'oxygène, cette tête définissant une portion de l'extrémité formant organe d'oxycoupage et étant solidarisée à la partie restante de l'élément de coupe au moyen d'une liaison démontable.According to an advantageous version of the invention, the cutting element comprises a cutting head having an oxygen election nozzle, this head defining a portion of the end forming an oxygen cutting member and being secured to the part remaining of the cutting element by means of a removable connection.
Cette version permet de ne remplacer que la tête de l'élément de coupe si la tuyère qu'elle porte est défectueuse. Cela réduit encore le coût de la maintenance, notamment en diminuant le volume de pièces de rechange nécessaires. On pourra aussi fabriquer la tête de coupe en un matériau bien adapté, tel que la céramique, et utiliser un matériau moins onéreux pour la partie restante de l'élément de coupe, tel que l'acier. Selon une version avantageuse de l'invention, l'un au moins des éléments de chauffe comprend une tête de chauffe présentant les orifices de chauffe, cette tête définissant une portion de l'extrémité formant organe d'oxycoupage et étant solidarisée à la partie restante de l'élément de chauffe au moyen d'une liaison démontable.This version makes it possible to replace only the head of the cutting element if the nozzle which it carries is defective. This further reduces the cost of maintenance, in particular by reducing the volume of spare parts required. It is also possible to manufacture the cutting head from a well-suited material, such as ceramic, and use a less expensive material for the remaining part of the cutting element, such as steel. According to an advantageous version of the invention, at least one of the heating elements comprises a heating head having the heating orifices, this head defining a portion of the end forming an oxygen-cutting member and being secured to the remaining part of the heating element by means of 'a removable link.
Cette version fournit des avantages similaires à ceux de la version précédente. Notamment, avec cette version, l'utilisation d'une tête de chauffe usinée de façon peu précise n'est plus du tout pénalisante, puisqu'on peut faire en sorte que cette tête de chauffe n'assure aucune fonction relative à la précision de la coupe. On réalisera avantageusement la tête de chauffe en cuivre par exemple.This version provides benefits similar to those of the previous version. In particular, with this version, the use of an indistinctly machined heating head is no longer penalizing at all, since it can be ensured that this heating head does not perform any function relating to the precision of the cup. Advantageously, the copper heating head will be produced, for example.
Selon une version préférée de l'invention, la tête de chauffe a la forme d'une couronne et est disposée coaxialement à la tête de coupe de sorte que la tête de chauffe et la tête de coupe définissent des portions respectivement périphérique et centrale de l'extrémité formant organe d'oxycoupage. Cette version montre que la réalisation du chalu¬ meau au moyen d'un élément de coupe et d'un élément de chauffe séparables est parfaitement compatible avec l'obtention d'un chalumeau muni d'une extrémité formant organe d'oxycoupage de type classique, présentant des orifices de chauffe en périphérie de l'orifice de coupe. Selon une autre version préférée de l'invention, dans laquelle le chalumeau est agencé pour être mobile lors de l'oxycoupage suivant une direction donnée relativement à la pièce à couper, certains au moins des orifices de chauffe se trouvent en amont des orifices de coupe en référence à la direction précitée.According to a preferred version of the invention, the heating head has the shape of a crown and is arranged coaxially with the cutting head so that the heating head and the cutting head define respectively peripheral and central portions of the end forming an oxygen cutting member. This version shows that the production of the chalu¬ meau by means of a cutting element and a separable heating element is perfectly compatible with obtaining a torch provided with an end forming an oxycutting member of conventional type. , having heating orifices at the periphery of the cutting orifice. According to another preferred version of the invention, in which the torch is designed to be movable during flame cutting in a given direction relative to the workpiece, at least some of the heating orifices are located upstream of the cutting orifices with reference to the aforementioned direction.
L'élément de chauffe assure ici sa fonction au moins en partie en amont de l'élément de coupe. On peut disposer plusieurs orifices de coupe en aval afin d'effec- tuer plusieurs coupes, à partir de ce chauffage commun de la pièce. En effet, il est intéressant de disposer de plusieurs orifices de coupe pour la coupe de pièces épaisses et en vue d'obtenir un bord coupé relativement plan. L'un au moins des orifices de coupe est alors installé de telle sorte que son courant d'oxygène forme avec le courant vertical d'un autre orifice un angle dans le plan de déplacement du chalumeau. L'orifice à courant incliné effectue ainsi la coupe dans le prolongement vertical de la coupe réalisée par l'orifice à courant vertical .The heating element here performs its function at least partially upstream of the cutting element. Several cutting openings can be arranged downstream in order to make several cuts, from this common heating of the room. Indeed, it is advantageous to have several cutting orifices for cutting thick pieces and in order to obtain a relatively flat cut edge. At least one of the cutting orifices is then installed so that its oxygen current forms with the vertical current from another orifice an angle in the plane of movement of the torch. The inclined current orifice thus performs the cut in the vertical extension of the cut made by the vertical current orifice.
Selon une version avantageuse de l'invention, le chalumeau comprend en outre un corps de chalumeau distinct et separable des éléments de coupe et de chauffe, les liai¬ sons démontables solidarisant alors l'élément de coupe au corps et l'élément de chauffe au corps.According to an advantageous version of the invention, the torch further comprises a separate torch body which can be separated from the cutting and heating elements, the removable links then joining the cutting element to the body and the heating element to the body.
On peut ainsi par exemple disposer d'un corps de chalumeau supportant à lui seul une grande partie des contraintes d'usinage liées à la fixation et au positionne¬ ment des éléments de coupe et de chauffe. Ce corps sera par exemple en acier, matériau facilement usinable. Les seules contraintes d'usinage sur les éléments de coupe et de chauffe sont alors celles relatives à leur liaison au corps . On diminue donc encore le coût des pièces de rechange. On pourra aussi disposer le corps relativement à l'abri des salissures et des projections, de sorte que son coût de fabrication sera amorti par une durée d'utilisation prolongée, plus longue que celle des éléments de coupe et de chauffe.It is thus possible, for example, to have a torch body which alone supports a large part of the machining constraints linked to the fixing and positioning of the cutting and heating elements. This body will for example be made of steel, an easily machinable material. The only machining constraints on the cutting and heating elements are then those relating to their connection to the body. The cost of spare parts is therefore further reduced. We can also arrange the body relatively sheltered from dirt and splashes, so that its manufacturing cost will be amortized by an extended period of use, longer than that of the cutting and heating elements.
Selon une version avantageuse de l'invention, le corps présente au moins un logement pour recevoir et supporter un élément de coupe ou de chauffe tel que précité, ce logement assurant à la fois le positionnement et la fixation amovible de l'élément au corps.According to an advantageous version of the invention, the body has at least one housing for receiving and supporting a cutting or heating element as mentioned above, this housing ensuring both the positioning and the removable fixing of the element to the body.
Ce dispositif permet un remplacement particuliè- rement rapide et facile de l'élément en question. Il peut par exemple s'agir d'un logement conique.This device allows particularly quick and easy replacement of the element in question. he can for example be a conical housing.
De plus, en réalisant un corps présentant plu¬ sieurs logements de ce type, on peut à volonté installer sur le chalumeau le ou les seuls éléments de coupe néces- saires à chaque opération de coupe. Cela préserve les éléments de coupe inutilisés. On peut aussi choisir librement le type d'élément de coupe à mettre en place, par exemple en fonction du diamètre de la tuyère de chaque élément. Selon une version avantageuse de l'invention, le chalumeau comprend plusieurs extrémités formant organe d'oxycoupage, les éléments de chauffe et de coupe étant solidaires d'un unique corps de chalumeau.In addition, by producing a body having several housings of this type, it is possible at will to install on the torch the one or only cutting elements necessary for each cutting operation. This preserves unused cutting elements. One can also freely choose the type of cutting element to be installed, for example depending on the diameter of the nozzle of each element. According to an advantageous version of the invention, the torch comprises several ends forming an oxygen cutting member, the heating and cutting elements being integral with a single torch body.
D'autres caractéristiques et avantages de l'in- vention apparaîtront encore dans la description qui va suivre de plusieurs modes préférés de réalisation de l'invention. Aux dessins annexés donnés à titre d'exemples non limitatifs:Other characteristics and advantages of the invention will become apparent in the description which follows of several preferred embodiments of the invention. In the appended drawings given by way of nonlimiting examples:
- la figure 1 est une vue en coupe axiale en élévation d'un premier mode de réalisation de l'invention,-- Figure 1 is an axial sectional elevation view of a first embodiment of the invention, -
- la figure 2 est une vue de dessous du chalumeau de la figure 1;- Figure 2 is a bottom view of the torch of Figure 1;
- la figure 3 est une vue schématique en coupe axiale en élévation d'un deuxième mode de réalisation de l'invention,- - la figure 4 est une vue en coupe axiale en élévation d'un troisième mode de réalisation de l'invention;- Figure 3 is a schematic view in axial section in elevation of a second embodiment of the invention, - - Figure 4 is a view in axial section in elevation of a third embodiment of the invention;
- la figure 5 est une vue en coupe du chalumeau de la figure 4 suivant le plan V-V;- Figure 5 is a sectional view of the torch of Figure 4 along the plane V-V;
- la figure 6 est une vue en coupe axiale en élévation d'un quatrième mode de réalisation de l'invention; et- Figure 6 is an axial sectional elevation view of a fourth embodiment of the invention; and
- la figure 7 est une vue en coupe du chalumeau de la figure 6 suivant le plan VII-VII sans l'élément de coupe 136.- Figure 7 is a sectional view of the torch of Figure 6 along the plane VII-VII without the cutting element 136.
Les figures 1 et 2 présentent un premier mode de réalisation du chalumeau d'oxycoupage selon l'invention, utilisé, comme les suivants, en sidérurgie pour la coupe d'une plaque d'acier 2.FIGS. 1 and 2 show a first embodiment of the flame cutting torch according to the invention, used, like the following, in the steel industry for cutting a steel plate 2.
Le chalumeau 1 comprend en l'espèce une extrémité formant organe d'oxycoupage 4, notamment visible en vue de dessous sur la figure 2. Cette extrémité 4 présente un orifice de coupe 6 et des orifices de chauffe 8. Le chalumeau présente aussi un conduit d'alimentation 10 de l'orifice de coupe 6. Ce conduit 10 communique avec une source d'oxygène non-représentée. Le chalumeau 1 présente encore des conduits d'alimentation 12 et 14 des orifices de chauffe 8, ces conduits communiquant respectivement avec la source d'oxygène et avec une source de gaz carburant non- représentée.The torch 1 in this case comprises an end forming an oxygen-cutting member 4, in particular visible from below in FIG. 2. This end 4 has a cutting orifice 6 and heating orifices 8. The torch also has a duct supply 10 of the cutting orifice 6. This conduit 10 communicates with a source of oxygen not shown. The torch 1 also has supply conduits 12 and 14 for the heating orifices 8, these conduits communicating respectively with the source of oxygen and with a source of fuel gas which is not shown.
L'orifice de coupe 6 et le conduit 10 qui l'ali- mente sont délimités par un élément de coupe 16 associé à l'extrémité formant organe d'oxycoupage 4. L'élément de coupe 16 communique avec la source d'alimentation en oxygène au moyen d'un raccord démontable 24.The cutting orifice 6 and the conduit 10 which feeds it are delimited by a cutting element 16 associated with the end forming an oxygen-cutting member 4. The cutting element 16 communicates with the power supply in oxygen by means of a removable connection 24.
L'élément de coupe 16 comprend une tubulure 22 délimitant la portion amont du conduit 10 et portant le raccord démontable 24 pour le raccordement de l'élément de coupe 16 à la source d'alimentation en oxygène. L'élément de coupe 16 comprend aussi une tête de coupe 26 présentant l'orifice 6 qui est en l'espèce une tuyère d'éjection de l'oxygène. Un conduit 17 de la tête de coupe 26 met la tuyère 6 en communication avec la tubulure 22. La tête 26 définit une portion de l'extrémité formant organe d'oxy¬ coupage 4. La tête 26 est solidarisée à la partie restante de l'élément de coupe 16, en l'espèce le conduit 22, au moyen d'une liaison démontable, par exemple une liaison vis-écrou.The cutting element 16 comprises a tube 22 delimiting the upstream portion of the conduit 10 and carrying the removable connector 24 for the connection of the cutting element 16 to the oxygen supply source. The cutting element 16 also includes a cutting head 26 having the orifice 6 which is in this case an oxygen ejection nozzle. A conduit 17 of the cutting head 26 puts the nozzle 6 in communication with the tubing 22. The head 26 defines a portion of the end forming an oxy¬ cutting member 4. The head 26 is secured to the remaining part of the 'cutting element 16, in this case the conduit 22, by means of a removable connection, for example a screw-nut connection.
Le conduit 22, la tête 26 et la tuyère 6 sont coaxiaux d'axe commun 28 et ont de préférence une section transversale circulaire. La tuyère 6 est de forme conique. La tête de coupe 26 est par exemple en céramique. Les orifices de chauffe 8 et les conduits 12, 14 qui les alimentent sont délimités par un élément de chauffe 18 associé à l'extrémité 4. L'élément de chauffe 18 communique avec ses sources d'alimentation respectives en oxygène et en gaz carburant au moyen de raccords démonta¬ bles 30 et 32.The duct 22, the head 26 and the nozzle 6 are coaxial with a common axis 28 and preferably have a circular cross section. The nozzle 6 is of conical shape. The cutting head 26 is for example made of ceramic. The heating orifices 8 and the conduits 12, 14 which supply them are delimited by a heating element 18 associated with the end 4. The heating element 18 communicates with its respective sources of oxygen and fuel gas supply to the by means of removable connectors 30 and 32.
Les raccords démontables 24, 30, 32 sont par exemple du type raccord rapide de sécurité.The removable couplings 24, 30, 32 are for example of the safety quick coupling type.
L'élément de chauffe 18 comprend deux tubulures 34, 36 délimitant les portions amont des conduits 12, 14 d'alimentation en oxygène et en gaz carburant de l'élément de chauffe 18 . Ces tubulures 34, 36 portent les raccords démontables respectifs précités 30, 32 pour le raccordement de l'élément 18 auxdites sources d'alimentation. L'élément de chauffe 18 comprend en outre une tête de chauffe 38 présentant les orifices de chauffe 8. Cette tête 38 définit une portion de l'extrémité formant organe d'oxycoupage 4. Elle est solidarisée à la partie restante de l'élément de chauffe 18, ici les tubulures 34, 36, au moyen d'une liaison démontable qui est par exemple une liaison vis- écrou.The heating element 18 comprises two pipes 34, 36 delimiting the upstream portions of the conduits 12, 14 for supplying oxygen and fuel gas to the heating element 18. These pipes 34, 36 carry the aforementioned respective removable connectors 30, 32 for the connection of the element 18 to said power sources. The heating element 18 further comprises a heating head 38 having the heating orifices 8. This head 38 defines a portion of the end forming an oxygen cutting member 4. It is secured to the remaining part of the heating element. heats 18, here the pipes 34, 36, by means of a removable connection which is for example a screw-nut connection.
La tête de chauffe 38 a ici la forme d'une couronne. Les orifices 8 forment un cercle sur la face inférieure de la tête de chauffe 38, comme le montre la figure 2. La tête de chauffe 38 comprend une chambre annulaire torique intérieure 40, communiquant avec les tubulures 34, 36 pour le mélange de l'oxygène de chauffe et du gaz carburant dans la chambre 40 et l'alimentation en mélange des orifices 8. La tête de chauffe 38 est de préférence en cuivre.The heating head 38 has here the shape of a crown. The orifices 8 form a circle on the underside of the heating head 38, as shown in FIG. 2. The heating head 38 comprises an inner toroidal annular chamber 40, communicating with the pipes 34, 36 for mixing the heating oxygen and fuel gas in the chamber 40 and the mixture supply of the orifices 8. The heating head 38 is preferably made of copper.
Conformément à une caractéristique essentielle de l'invention, l'élément de coupe 16 est distinct et separa¬ ble de l'élément de chauffe 18, et les éléments de coupe 16 et de chauffe 18 sont solidarisés au moyen d'au moins une liaison démontable. Les éléments de coupe 16 et de chauffe 18 défi¬ nissent au moins en partie l'extrémité formant organe d'oxycoupage 4. Dans le mode de réalisation illustré aux figures 1 et 2, les éléments de coupe 16 et de chauffe 18 définissent cette extrémité 4 à eux seuls. La tête de chauffe 38 est disposée coaxialement à la tête de coupe 26, de sorte que la tête de chauffe et la tête de coupe définissent les portions respectivement périphérique et centrale de l'extrémité formant organe d'oxycoupage 4 Le chalumeau 1 comprend en outre un corps de chalumeau 46 distinct et separable des éléments de coupe 16 et de chauffe 18. Le corps 46 a en l'espèce une forme générale annulaire coaxiale aux éléments de coupe et de chauffe. Dans le cas présent, les liaisons démontables solidarisant l'élément de coupe 16 à l'élément de chauffe 18 sont constituées par une liaison démontable solidarisant l'élément de coupe 16 directement au corps 46 et l'élément de chauffe 18 directement au corps 46. Ces deux liaisons démontables sont constituées ici par des liaisons par crabotε. Pour cela, une face extérieure cylindrique 42 de la tête de coupe 26 et une face intérieure cylindrique 44 du corps 46 portent des tenons et encoches non-représentés constituant la première liaison par crabots ,- de même une face extérieure conique 48 du corps 46 et une face inté¬ rieure conique 54 de la tête de chauffe 38 portent des tenons et encoches non-représentés constituant la deuxième liaison par crabotε, les deux cônes en question étant coaxiaux et ayant même angle au sommet. Pour l'ajustement des pièces, une face extérieure conique 50 de la tête de coupe 26 et une face intérieure conique 52 du corps 46 viennent en butée l'une contre l'autre, les deux cônes en question étant coaxiaux et ayant même angle au sommet. Ainsi, l'élément de coupe 16 et l'élément de chauffe 18 sont solidarisés l'un à l'autre, via le corps 46, par l'intermédiaire de leurs têtes respectives 26, 38. En outre, grâce à cette disposition, les faces 44 et 52 du corps définissent un logement pour recevoir et supporter la tête 26 de l'élément de coupe 16, ce logement assurant à la fois le positionnement et la fixation amovible de l'élément de coupe 16 au corps 46.In accordance with an essential characteristic of the invention, the cutting element 16 is distinct and separa¬ ble from the heating element 18, and the cutting elements 16 and heating element 18 are secured by means of at least one connection removable. The cutting elements 16 and heating elements 18 def¬ ne at least partially the end forming an oxygen-cutting member 4. In the embodiment illustrated in Figures 1 and 2, the cutting elements 16 and heating elements 18 define this end 4 alone. The heating head 38 is arranged coaxially with the cutting head 26, so that the heating head and the cutting head define the respectively peripheral and central portions of the end forming an oxygen-cutting member 4 The torch 1 further comprises a torch body 46 distinct and separable from the cutting 16 and heating elements 18. The body 46 in this case has a generally annular shape coaxial with the cutting and heating elements. In this case, the removable connections securing the cutting element 16 to the heating element 18 are constituted by a removable connection securing the cutting element 16 directly to the body 46 and the heating element 18 directly to the body 46 These two removable links are constituted here by crabotε links. For this, a cylindrical outer face 42 of the cutting head 26 and a cylindrical inner face 44 of the body 46 carry tenons and notches not shown constituting the first connection by dogs, - likewise a conical outer face 48 of the body 46 and a conical inner face 54 of the heating head 38 carry pins and notches not shown constituting the second connection by crabotε, the two cones in question being coaxial and having the same angle at the top. For the adjustment of the parts, a conical outer face 50 of the cutting head 26 and a conical inner face 52 of the body 46 abut one against the other, the two cones in question being coaxial and having the same angle at the Mountain peak. Thus, the cutting element 16 and the cutting element heaters 18 are secured to each other, via the body 46, via their respective heads 26, 38. In addition, thanks to this arrangement, the faces 44 and 52 of the body define a housing for receiving and supporting the head 26 of the cutting element 16, this housing ensuring both the positioning and the removable fixing of the cutting element 16 to the body 46.
Les tubulures 34 et 36 traversent le corps 46 parallèlement à l'axe 28 en passant par des canaux 56. Le corps de chalumeau 46 s'étend en partie à l'extérieur du chalumeau pour permettre la fixation du chalumeau 1 sur un support prédéterminé 58 par l'intermé¬ diaire du corps 46. Ce support 58 est par exemple un porte- outil classique. Le corps de chalumeau 46 est de préférence en acier.The pipes 34 and 36 pass through the body 46 parallel to the axis 28 passing through channels 56. The torch body 46 extends partly outside the torch to allow the torch 1 to be fixed on a predetermined support 58 via the body 46. This support 58 is for example a conventional tool holder. The torch body 46 is preferably made of steel.
Le chalumeau qui vient d'être décrit fonctionne de la façon suivante.The blowtorch which has just been described operates in the following manner.
Les tubulures 34 et 36 alimentent la tête de chauffe 38 respectivement en oxygène de chauffe et en gaz carburant. Ces deux fluides se mélangent dans la chambre annulaire 40. Le mélange ainsi réalisé s'échappe par les orifices 8 où il se consume, produisant des flammes orien¬ tées en direction de la pièce à couper 2, selon la surface d'un cône d'axe 28 de sommet tourné vers la pièce 2. La tubulure 22 alimente la tête de coupe 26 en oxygène de coupe. Celui-ci s'échappe par la tuyère 6 pour être projeté en direction de la partie de la pièce 2 chauffée par les orifices 8 pour effectuer la coupe.The pipes 34 and 36 supply the heating head 38 respectively with heating oxygen and fuel gas. These two fluids mix in the annular chamber 40. The mixture thus produced escapes through the orifices 8 where it is consumed, producing flames orien¬ ted towards the workpiece 2, according to the surface of a cone d 'axis 28 of vertex facing part 2. The tubing 22 supplies the cutting head 26 with cutting oxygen. This escapes through the nozzle 6 to be projected towards the part of the part 2 heated by the orifices 8 to make the cut.
Le montage du chalumeau s'effectue par exemple de la façon suivante. On raccorde la tubulure 22 à la tête de coupe 26 pour constituer l'élément de coupe 16. On ver¬ rouille la tête de chauffe 38 sur le corps 46. Puis en engageant les tubulures 34, 36 dans les canaux 56, on verrouille celles-ci à la tête de chauffe 38 pour consti- tuer l'élément de chauffe 18. Puis on verrouille la tête de coupe 26 sur le corps 46 pour fixer l'élément de coupe au corps 46. On relie enfin les raccords 24, 30, 32 aux tubulures respectives 22, 34, 36 et aux sources d'alimenta¬ tion correspondantes. Si l'une quelconque des pièces constituant le chalumeau 1 est endommagée, par exemple la tête de coupe 26 ou de chauffe 38, son démontage et son remplacement peuvent être effectués sur le champ sans délai. Le remplacement de la seule pièce défectueuse permet de disposer d'un chalu- meau en état de marche.The assembly of the torch is carried out for example in the following manner. The tubing 22 is connected to the cutting head 26 to constitute the cutting element 16. The heating head 38 is rusted on the body 46. Then, by engaging the tubing 34, 36 in the channels 56, those are locked. -this at the heating head 38 to constitute the heating element 18. Then the locking head is locked section 26 on the body 46 to fix the cutting element to the body 46. Finally, the connections 24, 30, 32 are connected to the respective pipes 22, 34, 36 and to the corresponding power sources. If any of the parts constituting the torch 1 is damaged, for example the cutting head 26 or heating head 38, its disassembly and replacement can be carried out immediately. Replacing the only defective part provides a working torch.
Toutes les pièces, en particulier la tête de coupe 26, la tête de chauffe 38 et le corps 46, peuvent être réalisées dans les matériaux et selon les modes les mieux adaptés à la situation. Dans le présent exemple, la tête de chauffe 38 n'assure aucune fonction relative à la précision de la coupe. Une tolérance de cote peu serrée pourra donc suffire. En revanche, le corps 46 assure la fixation et l'ajustement de la tête de coupe 26. Ses tolérances de cote seront donc très précises, ce qui ne pose pas de difficulté de réalisation car le corps 46 est ici en acier.All the parts, in particular the cutting head 26, the heating head 38 and the body 46, can be produced from the materials and according to the modes best suited to the situation. In the present example, the heating head 38 does not perform any function relating to the precision of the cut. A loosely dimension tolerance may therefore suffice. On the other hand, the body 46 ensures the fixing and adjustment of the cutting head 26. Its dimension tolerances will therefore be very precise, which does not pose any difficulty in production since the body 46 is here made of steel.
Dans une variante de ce premier mode de réalisa¬ tion, la tête de coupe 26 peut présenter un conduit latéral 51, dessiné en traits pointillés, débouchant sur l'extré- mité formant organe d'oxycoupage 4 par un orifice 55, et sur la face supérieure de la tête de coupe 26 pour y être relié à la source de gaz carburant, via un conduit 53 également dessiné en traits pointillés. On munit ainsi l'extrémité formant organe d'oxycoupage 4 d'un orifice de gaz carburant pur dont l'apport, en surplus du mélange oxygène de chauffe-gaz carburant fourni par les orifices 8, peut constituer un avantage dans certaines applications.In a variant of this first embodiment, the cutting head 26 may have a lateral duct 51, drawn in dotted lines, leading to the end forming an oxygen-cutting member 4 through an orifice 55, and to the upper face of the cutting head 26 to be connected to the fuel gas source there, via a conduit 53 also drawn in dotted lines. The end forming the flame-cutting member 4 is thus provided with a pure fuel gas orifice, the addition of which, in addition to the oxygen mixture of fuel gas heater supplied by the orifices 8, can constitute an advantage in certain applications.
La figure 3 présente un deuxième mode de réalisa¬ tion très proche du premier, dans lequel les références identiques désignent les mêmes composants. Pour plus de clarté, les hachures n'ont pas été portées sur la figure 3. Le chalumeau 3 comprend plusieurs extrémités formant organe d'oxycoupage 4a, 4b, 4c, en l'espèce trois. Chaque extrémité 4a, 4b, 4c est en tous points semblable à l'extrémité 4 du premier mode de réalisation. La seule différence entre le chalumeau 1 et le chalumeau 3 réside dans le fait que les trois éléments de coupe 16 et les trois éléments de chauffe 18 sont solidaires d'un unique corps de chalumeau 60, commun aux trois extrémités 4a, 4b, 4c. Les éléments de coupe et de chauffe sont reliés au corps 60 par des liaisons démontables identiques à celles du précédent mode de réalisation. Le chalumeau 3 est supporté par l'intermédiaire de son corps 60 par un porte- outil 62. Un tel chalumeau permet par exemple d'effectuer simultanément plusieurs coupes dans le prolongement vertical l'une de l'autre pour couper plus rapidement une pièce épaisse, comme expliqué dans le préambule de la présente demande. Pour cela, on peut alors incliner l'extrémité 4c de sorte que son axe 28c demeure dans le plan défini par les axes 28a, 28b des extrémités 4a et 4b mais forme un angle avec ceux-ci. L'axe 28c ainsi incliné est représenté en traits pointillés. L'extrémité 4c effectue alors la coupe dans le prolongement de la coupe effectuée par l'extrémité 4b.FIG. 3 shows a second embodiment very close to the first, in which the identical references designate the same components. For more than clarity, the hatching has not been shown in Figure 3. The torch 3 comprises several ends forming an oxygen cutting member 4a, 4b, 4c, in this case three. Each end 4a, 4b, 4c is in all points similar to the end 4 of the first embodiment. The only difference between the torch 1 and the torch 3 lies in the fact that the three cutting elements 16 and the three heating elements 18 are integral with a single torch body 60, common to the three ends 4a, 4b, 4c. The cutting and heating elements are connected to the body 60 by removable links identical to those of the previous embodiment. The torch 3 is supported via its body 60 by a tool holder 62. Such a torch allows for example to make several cuts simultaneously in the vertical extension of one another to cut a thick piece more quickly , as explained in the preamble to this application. For this, one can then tilt the end 4c so that its axis 28c remains in the plane defined by the axes 28a, 28b of the ends 4a and 4b but forms an angle with them. The axis 28c thus inclined is shown in dotted lines. The end 4c then performs the cut in the extension of the cut made by the end 4b.
Les figures 4 et 5 présentent un troisième mode de réalisation de l'invention dans lequel les éléments similaires portent les mêmes références.Figures 4 and 5 show a third embodiment of the invention in which the similar elements have the same references.
Le chalumeau 5 comprend une extrémité formant organe d'oxycoupage 64 présentant un orifice central de coupe 66 et un orifice périphérique de chauffe 68.The torch 5 comprises one end forming an oxygen cutting member 64 having a central cutting orifice 66 and a peripheral heating orifice 68.
Le chalumeau 5 comprend un élément de coupe 70 comprenant une tuyère formant tête de coupe 72 qui présente l'orifice de coupe 66, et une tubulure 74 qui constitue le conduit d'alimentation de l'orifice de coupe 66. Le chalumeau 5 comprend aussi un élément de chauffe 76. Celui-ci comprend une buse creuse formant tête de chauffe 78 dont la portion aval 80 a une forme conique et la portion amont 84 une forme cylindrique. L'élément de chauffe comprend aussi un voile 82 disposé transversalement à la buse 78 et fixé à sa portion cylindrique amont 84. Un disque 85 est en outre fixé transversalement à la tubulure 74 de l'élément de coupe 70. Le voile 82 et le disque 85 sont traversés par la tubulure 74. Toutes les pièces du chalumeau qui viennent d'être décrites sont coaxiales d'axe 87 et à section circulaire.The torch 5 comprises a cutting element 70 comprising a nozzle forming a cutting head 72 which has the cutting orifice 66, and a tube 74 which constitutes the supply conduit for the cutting orifice 66. The torch 5 also includes a heating element 76. This comprises a hollow nozzle forming a heating head 78, the downstream portion 80 has a conical shape and the upstream portion 84 a cylindrical shape. The heating element also comprises a veil 82 arranged transversely to the nozzle 78 and fixed to its upstream cylindrical portion 84. A disc 85 is also fixed transversely to the pipe 74 of the cutting element 70. The veil 82 and the disc 85 are crossed by the tubing 74. All the parts of the torch which have just been described are coaxial with axis 87 and of circular section.
L'élément de chauffe 76 comprend encore deux tubulures 86 et 88 parallèles à l'axe 87, qui constituent les conduits d'alimentation de l'orifice de chauffe 68 respectivement en oxygène de chauffe et en gaz carburant. L'extrémité aval 90 des tubulures 86, 88 traverse le voile 82 pour déboucher dans la buse 78. L'extrémité amont 92 des tubulures 86, 88 traverse le disque 85 pour déboucher à l'extérieur du chalumeau.The heating element 76 also comprises two pipes 86 and 88 parallel to the axis 87, which constitute the supply conduits for the heating orifice 68 in heating oxygen and fuel gas respectively. The downstream end 90 of the pipes 86, 88 passes through the web 82 to open into the nozzle 78. The upstream end 92 of the pipes 86, 88 crosses the disc 85 to open up outside the torch.
Les tubulures 74, 86, 88 portent à leur extrémité amont des raccords démontables 24, 30, 32 tels que précités pour le raccordement des éléments de coupe 70 et de chauffe 76 aux sources d'alimentation du chalumeau. Comme le montre la figure 5, les tubulures 74,The pipes 74, 86, 88 carry at their upstream end removable connectors 24, 30, 32 as mentioned above for the connection of the cutting elements 70 and the heating elements 76 to the supply sources of the torch. As shown in FIG. 5, the tubes 74,
86, 88 sont fixées au disque 85 en étant engagées et serrées dans des encoches radiales respectives 94, 96, 98 de ce disque 85. Ces encoches se terminent par une portion cylindrique d'axe parallèle à l'axe 87 pour épouser la forme extérieure des tubulures 74, 86 et 88 et assurer leur serrage. Le disque 85 de l'élément de chauffe 76 assure la fixation amovible de cet élément à la tubulure 74 de l'élé¬ ment de coupe 70. L'élément de chauffe 76 est donc directe¬ ment solidarisé à l'élément de coupe 70. Les tubulures 74, 86, 88 traversent le voile 82 suivant un ajustement glissant, le voile n'assurant qu'une fonction de positionnement des tubulures.86, 88 are fixed to the disc 85 while being engaged and tightened in respective radial notches 94, 96, 98 of this disc 85. These notches end in a cylindrical portion with an axis parallel to the axis 87 to match the external shape pipes 74, 86 and 88 and ensure their tightening. The disc 85 of the heating element 76 ensures the removable fixing of this element to the tube 74 of the cutting element 70. The heating element 76 is therefore directly secured to the cutting element 70 The tubes 74, 86, 88 pass through the web 82 following a sliding adjustment, the web ensuring only a positioning function of the pipes.
Le chalumeau 5 comprend encore un fourreau cylin¬ drique allongé 100 s'étendant depuis le disque 85 jusqu'à la portion cylindrique amont 84 de la buse 78. Le voile 82 est fixé à la buse 78 par serrage à l'intérieur de la portion cylindrique 84. La buse 78 est fixée au fourreau 100 par serrage à l'intérieur de celui-ci. Les pièces constituant le chalumeau 5 sont de préférence en acier, à l'exception de la buse 78 qui est en cuivre.The torch 5 also comprises an elongated cylindrical sleeve 100 extending from the disc 85 to the upstream cylindrical portion 84 of the nozzle 78. The web 82 is fixed to the nozzle 78 by tightening inside the portion cylindrical 84. The nozzle 78 is fixed to the sheath 100 by clamping inside the latter. The parts constituting the torch 5 are preferably made of steel, with the exception of the nozzle 78 which is made of copper.
Dans ce mode de réalisation, les éléments de coupe 70 et de chauffe 76 définissent à eux seuls ladite extrémité formant organe d'oxycoupage 64, au moyen de la tuyère 72 et de la buse 78. De plus, dans ce mode de réalisation encore, la buse formant tête de chauffe 78 a la forme d'une couronne et est disposée coaxialement à la tuyère formant tête de coupe 72, de sorte que la tête de chauffe 78 et la tête de coupe 72 définissent des portions respectivement périphéri- que et centrale de l'extrémité formant organe d'oxycoupage 64.In this embodiment, the cutting elements 70 and the heating elements 76 alone define said end forming an oxygen cutting member 64, by means of the nozzle 72 and the nozzle 78. In addition, in this embodiment again, the nozzle forming the heating head 78 has the shape of a crown and is arranged coaxially with the nozzle forming the cutting head 72, so that the heating head 78 and the cutting head 72 define respectively peripheral and central portions of the end forming an oxygen cutting member 64.
La buse creuse 78 délimite une enceinte 79 alimentée par les tubulures 86 et 88, dans laquelle se mélangent l'oxygène de chauffe et le gaz carburant. Ce mélange est consumé à l'orifice de chauffe 68 de l'extré¬ mité formant organe d'oxycoupage 64 pour chauffer la pièce à couper. Cette chauffe se produit en périphérie de l'orifice 66 d'éjection de l'oxygène de coupe.The hollow nozzle 78 delimits an enclosure 79 supplied by the tubes 86 and 88, in which the heating oxygen and the fuel gas are mixed. This mixture is consumed at the heating orifice 68 of the extremity forming an oxygen-cutting member 64 to heat the part to be cut. This heating occurs at the periphery of the orifice 66 for ejecting the cutting oxygen.
Pour monter le chalumeau 5, on engage les tubulu- res 74, 86, 88 dans les encoches correspondantes 94, 96, 98 du disque 85. On introduit ce disque à l'extrémité amont du fourreau 100 pour l'y fixer par serrage. Ayant fixé le voile 82 dans la buse 78, on introduit la buse à l'extré¬ mité aval du fourreau 100 pour l'y fixer par serrage, le voile 82 recevant les tubulures 74, 86, 88 à travers ses orifices .To mount the torch 5, the tubes 74, 86, 88 are engaged in the corresponding notches 94, 96, 98 of the disc 85. This disc is introduced at the upstream end of the sheath 100 to fix it there by clamping. Having fixed the veil 82 in the nozzle 78, the nozzle is introduced at the downstream end of the sheath 100 in order to fix it there by tightening, the veil 82 receiving the pipes 74, 86, 88 through its orifices.
On démonte le chalumeau en effectuant les mêmes opérations dans l'ordre inverse. On peut à loisir changer une pièce défectueuse du chalumeau sans que ce changement soit long ou onéreux. Grâce à sa forme allongée, ce chalumeau est adapté pour effectuer des coupes dans des endroits difficiles d'accès.The torch is dismantled by performing the same operations in reverse order. You can freely change a defective part of the torch without this change being long or expensive. Thanks to its elongated shape, this torch is suitable for making cuts in places that are difficult to access.
Les figures 6 et 7 présentent un quatrième mode de réalisation de l'invention. Le chalumeau 7 comprend un élément de chauffeFigures 6 and 7 show a fourth embodiment of the invention. The torch 7 includes a heating element
110. En l'espèce, ce dernier comprend une tête de chauffe 112 de forme générale parallélépipédique. La tête de chauffe présente un évidement cylindrique 114 débouchant au niveau de la face amont 116 de la tête 112. Cet évidement renferme un manchon poreux cylindrique coaxial 118 ouvert à son extrémité axiale amont 120, située du coté de la face 116, et fermé à l'autre extrémité axiale 122 du manchon 118.110. In the present case, the latter comprises a heating head 112 of generally parallelepiped shape. The heating head has a cylindrical recess 114 opening at the upstream face 116 of the head 112. This recess contains a porous coaxial cylindrical sleeve 118 open at its upstream axial end 120, located on the side of the face 116, and closed at the other axial end 122 of the sleeve 118.
Le manchon 118 est raccordé à son extrémité axiale amont 120 à un conduit 124. Ce conduit 124 est raccordé de façon non représentée à une chambre de mélange alimentée elle-même au moyen de raccords démontables, analogues à ceux des précédents modes, à une source d'oxygène de chauffe et une source de gaz carburant. Le manchon 118 est ainsi alimenté en mélange oxygène de chauffe-gaz carburant. La tête de chauffe 112 et le manchon 118 constituent l'élément de chauffe 110.The sleeve 118 is connected at its upstream axial end 120 to a conduit 124. This conduit 124 is connected in a manner not shown to a mixing chamber supplied itself by means of removable connectors, similar to those of the previous modes, to a source heating oxygen and a source of fuel gas. The sleeve 118 is thus supplied with an oxygen mixture of fuel gas heaters. The heating head 112 and the sleeve 118 constitute the heating element 110.
La tête de chauffe 112 présente sur sa face inférieure 126 deux rangées symétriques d'orifices de chauffe 130, ici au nombre de huit par rangée. Ces orifices 130 mettent la face inférieure 126 en communication avec le manchon poreux 118 qui les alimente en mélange oxygène-gaz carburant. La tête de chauffe 112 pourrait en variante comprendre des brûleurs de type classique, avec réalisation dans la tête du brûleur du mélange oxygène - gaz carburant. Le chalumeau 7 comprend aussi un corps 132 de forme générale parallélépipédique, s'étendant dans le prolongement de la tête de chauffe 112. Le corps 132 est fixé à la tête de chauffe au moyen d'une liaison démontable constituée ici par une saillie 133 du corps 132 s'emboî¬ tant dans une encoche 135 de la tête de chauffe 112 avec un ajustement serré. On pourra cependant utiliser tout autre type de liaison démontable.The heating head 112 has on its lower face 126 two symmetrical rows of heating orifices 130, here eight in number per row. These orifices 130 place the lower face 126 in communication with the porous sleeve 118 which supplies them with an oxygen-fuel gas mixture. The heating head 112 could alternatively include burners of the conventional type, with the oxygen-gas fuel mixture being produced in the burner head. The torch 7 also comprises a body 132 of generally parallelepiped shape, extending in the extension of the heating head 112. The body 132 is fixed to the heating head by means of a removable connection formed here by a projection 133 of the body 132 fits both in a notch 135 of the heating head 112 with a tight fit. We can however use any other type of removable link.
Le corps 132 présente trois logements 134a, 134b, 134c pour recevoir et supporter un élément de coupe ou de chauffe, de sorte que chaque logement assure à la fois le positionnement et la fixation amovible de cet élément au corps 132. Ici, ces logements 134a, 134b, 134c sont destinés à recevoir un élément de coupe tel que celui 136 représenté dans le logement 134a.The body 132 has three housings 134a, 134b, 134c for receiving and supporting a cutting or heating element, so that each housing ensures both the positioning and the removable fixing of this element to the body 132. Here, these housings 134a , 134b, 134c are intended to receive a cutting element such as that 136 shown in the housing 134a.
Chaque logement a une forme en cône d'axe 138 vertical orthogonal à l'axe 154 du manchon 118, la pointe du cône étant orientée vers le bas. Chaque logement se prolonge par une tuyère 140 ayant la forme d'un cône coaxial au logement et dont la pointe est tournée vers le haut de sorte que les deux cônes s'interpénétrent et sont tronqués à leur pointe.Each housing has a cone shape with a vertical axis 138 orthogonal to the axis 154 of the sleeve 118, the tip of the cone being oriented downwards. Each housing is extended by a nozzle 140 having the shape of a cone coaxial with the housing and the point of which is turned upwards so that the two cones interpenetrate and are truncated at their point.
L'élément de coupe 136 comprend une tête de coupe 142 de forme extérieure conique ayant même angle au sommet que le cône du logement 134a afin de s'adapter parfaitement à l'intérieur du logement 134a. L'élément de coupe 136 est automatiquement positionné lors de son introduction dans le logement 134a. Des moyens de fixation de l'élément de coupe 136 au corps 132 peuvent éventuellement être prévus. La tête de coupe 142 est traversée suivant l'axe du cône par un conduit 144 se terminant en prétuyère 146 à l'extrémité aval 143 de la tête 142. La tête 142 est alimentée à son extrémité amont 148 par une tubulure 150 raccordée à une source d'oxygène au moyen d'une liaison démontable 152 qui est ici une liaison par raccord rapide. La prétuyère 146 définit un orifice de coupe.The cutting element 136 comprises a cutting head 142 of conical outer shape having the same angle at the top as the cone of the housing 134a in order to fit perfectly inside the housing 134a. The cutting element 136 is automatically positioned when it is inserted into the housing 134a. Means for fixing the cutting element 136 to the body 132 may possibly be provided. The cutting head 142 is crossed along the axis of the cone by a conduit 144 ending in pre-nozzle 146 at the downstream end 143 of the head 142. The head 142 is supplied at its upstream end 148 by a tube 150 connected to a oxygen source by means of a removable connection 152 which is here a connection by quick coupling. The pre-nozzle 146 defines a cutting orifice.
L'extrémité formant organe d'oxycoupage 158 du chalumeau 7 est donc constituée par la face inférieure 126 de la tête de chauffe 112, la face inférieure 156 du corps 132 et l'extrémité aval 143 de l'élément de coupe 136, ou des éléments de coupe si plusieurs sont installés. C'est donc ici le corps 132 et les éléments de coupe 136 et de chauffe 110 qui définissent l'extrémité formant organe d'oxycoupage 158. La tête de chauffe 112 est de préférence en acier, de même que le corps 132 et la tête de coupe 142.The end forming an oxygen-cutting member 158 of the torch 7 is therefore constituted by the lower face 126 of the heating head 112, the lower face 156 of the body 132 and the downstream end 143 of the cutting element 136, or cutting elements if several are installed. It is therefore here the body 132 and the cutting elements 136 and the heating elements 110 which define the end forming an oxygen-cutting member 158. The heating head 112 is preferably made of steel, as is the body 132 and the head cutting 142.
Le chalumeau 7 est agencé pour être mobile lors de l' oxycoupage suivant une direction donnée relativement à la pièce à couper. Cette direction est indiquée sur la figure 6 par la flèche F orientée parallèlement à l'axe 154 du manchon 118. Ainsi, les orifices de chauffe 130 se trouvent en amont des orifices de coupe 146 en référence à la direction de la flèche F.The torch 7 is designed to be movable during flame cutting in a given direction relative to the workpiece. This direction is indicated in FIG. 6 by the arrow F oriented parallel to the axis 154 of the sleeve 118. Thus, the heating orifices 130 are located upstream of the cutting orifices 146 with reference to the direction of the arrow F.
En fonctionnement, la portion de la pièce à couper est donc préalablement chauffée par les orifices de chauffe 130. Elle est ensuite oxycoupée par l'élément de coupe 136 qui projette l'oxygène de coupe à travers la tuyère 140.In operation, the portion of the part to be cut is therefore heated beforehand by the heating orifices 130. It is then flame cut by the cutting element 136 which projects the cutting oxygen through the nozzle 140.
Chaque logement 134a, 134b, 134c peut recevoir suivant les besoins un élément de coupe ou de chauffe ou être laissé vide. Ainsi, on pourra ne disposer qu'un élément de coupe 136 comme sur la figure 6, ou disposer un élément de chauffe dans le logement 134a et un élément de coupe dans le logement 134b. On pourra en outre encore disposer un élément de coupe dans chaque logement. Dans les cas où au moins deux éléments de coupe sont utilisés, il sera avantageux de réaliser un logement dont l'axe 138 est incliné pour obtenir des fronts de coupe dans le prolonge¬ ment l'un de l'autre tel que précité. On pourra donner des sections différentes aux logements afin d'utiliser au choix des éléments de coupe ou de chauffe offrant un débit de fluide plus ou moins important .Each housing 134a, 134b, 134c can receive, as required, a cutting or heating element or be left empty. Thus, it will be possible to have only one cutting element 136 as in FIG. 6, or to have a heating element in the housing 134a and a cutting element in the housing 134b. It is also possible to have a cutting element in each housing. In cases where at least two cutting elements are used, it will be advantageous to produce a housing whose axis 138 is inclined to obtain cutting fronts in the extension of one another as mentioned above. We can give different sections to the housing in order to use as desired cutting or heating elements offering a greater or lesser flow of fluid.
Ici, encore, on peut remplacer à volonté l'élé¬ ment de chauffe et/ou le ou les éléments de coupe s'ils sont défectueux.Here again, the heating element and / or the cutting element or elements can be replaced at will if they are defective.
Bien entendu, on pourra apporter à l'invention de nombreuses modifications et améliorations sans sortir du cadre de celle-ci. On pourra notamment adopter de très nombreuses configurations pour les éléments de coupe et de chauffe. Of course, many modifications and improvements can be made to the invention without departing from the scope thereof. We can in particular adopt many configurations for the cutting and heating elements.

Claims

REVENDICATIONS 1. Chalumeau d'oxycoupage (1; 3; 5; 7) comprenant au moins une extrémité formant organe d'oxycoupage (4; 4a, 4b, 4c,• 64; 158) qui présente au moins un orifice de coupe (6; 66; 146) et des orifices de chauffe (8; 68; 130), au moins un conduit d'alimentation de l'orifice de coupe communiquant avec une source d'oxygène, et des conduits d'alimentation des orifices de chauffe communiquant avec la source d'oxygène et avec une source de gaz carburant, le chalumeau étant caractérisé par le fait que l'orifice de coupe (6; 66; 146) et le conduit qui l'alimente sont délimités par un élément de coupe (16; 70; 136) associé à cette extrémité (4; 4a, 4b, 4c,- 64; 158), et les orifices de chauffe (8; 68; 130) et les conduits qui les alimentent sont délimités par un élément de chauffe (18; 76; 110) associé à cette extrémité, l'élément de coupe (16; 70; 136) étant distinct et separable de l'élément de chauffe (18; 76; 110), les éléments de coupe (16; 70; 136) et de chauffe (18; 76; 110) étant solidarisés au moyen d'au moins une liaison démontable et définissant au moins en partie ladite extrémité formant organe d'oxycoupage (4; 4a, 4b, 4c,- 64; 158) .CLAIMS 1. Oxygen cutting torch (1; 3; 5; 7) comprising at least one end forming an oxy-cutting member (4; 4a, 4b, 4c, • 64; 158) which has at least one cutting orifice (6 ; 66; 146) and heating orifices (8; 68; 130), at least one supply duct for the cutting orifice communicating with an oxygen source, and supply ducts for the heating orifices communicating with the oxygen source and with a source of fuel gas, the torch being characterized in that the cutting orifice (6; 66; 146) and the duct which supplies it are delimited by a cutting element (16 ; 70; 136) associated with this end (4; 4a, 4b, 4c, - 64; 158), and the heating orifices (8; 68; 130) and the conduits which supply them are delimited by a heating element ( 18; 76; 110) associated with this end, the cutting element (16; 70; 136) being distinct and separable from the heating element (18; 76; 110), the cutting elements (16; 70;136) and heater (18; 76; 110) being secured by means of at least one removable connection and defining at least in part said end forming an oxygen cutting member (4; 4a, 4b, 4c, - 64; 158).
2. Chalumeau selon la revendication 1, caracté¬ risé par le fait que les éléments de coupe (16; 70; 136) et de chauffe (18; 76; 110) communiquent avec leurs sources d'alimentation respectives en oxygène et en gaz carburant au moyen de raccords démontables (24, 30, 32; 152).2. Torch according to claim 1, caracté¬ ized in that the cutting elements (16; 70; 136) and heating (18; 76; 110) communicate with their respective sources of oxygen and fuel gas supply by means of removable fittings (24, 30, 32; 152).
3. Chalumeau selon la revendication 2, caracté¬ risé par le fait que l'un au moins des éléments de coupe (16; 70; 136) ou de chauffe (18; 76; 110) comprend une tubulure (22, 34, 36; 74, 86, 88,- 150) délimitant une portion amont d'un desdits conduits et portant l'un desdits raccords démontables pour le raccordement de l'élément à l'une desdites sources d'alimentation. 3. Torch according to claim 2, caracté¬ ized in that at least one of the cutting elements (16; 70; 136) or heating (18; 76; 110) comprises a tube (22, 34, 36 ; 74, 86, 88, - 150) delimiting an upstream portion of one of said conduits and carrying one of said removable connectors for the connection of the element to one of said power sources.
4. Chalumeau selon l'une des revendications précédentes, caractérisé par le fait que l'élément de coupe (16; 70; 136) comprend une tête de coupe (26; 72; 142) présentant une tuyère d'éjection de l'oxygène, cette tête définissant une portion de l'extrémité formant organe d'oxycoupage (4; 4a, 4b, 4c; 64; 158) et étant solidarisée à la partie restante de l'élément de coupe (16; 70; 136) au moyen d'une liaison démontable.4. Torch according to one of claims above, characterized in that the cutting element (16; 70; 136) comprises a cutting head (26; 72; 142) having an oxygen ejection nozzle, this head defining a portion of the end forming an oxygen-cutting member (4; 4a, 4b, 4c; 64; 158) and being secured to the remaining part of the cutting element (16; 70; 136) by means of a removable connection.
5. Chalumeau selon la revendication 4, caracté¬ risé par le fait que la tête de coupe (26) est en cérami- que.5. Torch according to claim 4, caracté¬ ized in that the cutting head (26) is made of ceramic.
6. Chalumeau selon l'une des revendications précédentes, caractérisé par le fait que l'un au moins des éléments de chauffe (18; 76; 110) comprend une tête de chauffe présentant les orifices de chauffe (8; 68; 130) , cette tête définissant une portion de l'extrémité formant organe d'oxycoupage (4; 4a, 4b, 4c,- 64; 158) et étant solidarisée à la partie restante de l'élément de chauffe (18; 76,- 110) au moyen d'une liaison démontable.6. Torch according to one of the preceding claims, characterized in that at least one of the heating elements (18; 76; 110) comprises a heating head having the heating orifices (8; 68; 130), this head defining a portion of the end forming an oxygen cutting member (4; 4a, 4b, 4c, - 64; 158) and being secured to the remaining part of the heating element (18; 76, - 110) at the by means of a removable link.
7. Chalumeau selon l'une des revendications 4 à 6, caractérisé par le fait que l'un au moins des éléments de chauffe (18; 76; 110) ou de coupe (16; 70; 136) est solidarisé à l'autre ou aux autres éléments par l'inter¬ médiaire de sa tête.7. Torch according to one of claims 4 to 6, characterized in that at least one of the heating elements (18; 76; 110) or cutting (16; 70; 136) is secured to the other or other elements through his head.
8. Chalumeau selon l'une des revendications 4 à 7, caractérisé par le fait que la tête de chauffe (38; 78) a la forme d'une couronne et est disposée coaxialement à la tête de coupe (26; 72) de sorte que la tête de chauffe (38; 78) et la tête de coupe (26; 72) définissent des portions respectivement périphérique et centrale de l'extrémité formant organe d'oxycoupage (4; 64) .8. Torch according to one of claims 4 to 7, characterized in that the heating head (38; 78) has the shape of a crown and is arranged coaxially with the cutting head (26; 72) so that the heating head (38; 78) and the cutting head (26; 72) define respectively peripheral and central portions of the end forming an oxygen-cutting member (4; 64).
9. Chalumeau selon l'une des revendications précédentes, agencé pour être mobile lors de l' oxycoupage suivant une direction donnée (F) relativement à la pièce à couper, ledit chalumeau étant caractérisé par le fait que certains au moins des orifices de chauffe (130) se trouvent en amont des orifices de coupe (146) en référence à la direction précitée.9. Torch according to one of the preceding claims, arranged to be movable during flame cutting in a given direction (F) relative to the workpiece, said torch being characterized in that at least some of the heating orifices ( 130) are found upstream of the cutting orifices (146) with reference to the aforementioned direction.
10. Chalumeau selon l'une des revendications précédentes, caractérisé par le fait qu'il comprend en outre un corps de chalumeau (46; 60; 132) distinct et separable des éléments de coupe (16; 136) et de chauffe (18; 110) , lesdites liaisons démontables solidarisant l'élément de coupe (16; 136) au corps et l'élément de chauffe (18; 110) au corps. 10. Torch according to one of the preceding claims, characterized in that it further comprises a torch body (46; 60; 132) distinct and separable from the cutting (16; 136) and heating (18; 110), said removable links securing the cutting element (16; 136) to the body and the heating element (18; 110) to the body.
11. Chalumeau selon la revendication 10, caracté¬ risé par le fait que le corps de chalumeau (46; 60; 132) s'étend au moins en partie à l'extérieur du chalumeau pour permettre la fixation du chalumeau sur un support prédéter¬ miné par l'intermédiaire du corps. 11. The torch according to claim 10, caracté¬ ized in that the torch body (46; 60; 132) extends at least partially outside the torch to allow the fixing of the torch on a predeter¬ undermined through the body.
12. Chalumeau selon l'une des revendications 10 à 11, caractérisé par le fait que le corps (46; 60; 132) présente au moins un logement (44, 52; 134a, 134b, 134c) pour recevoir et supporter un élément de coupe (10; 136) ou de chauffe tel que précité, ce logement assurant à la fois le positionnement et la fixation amovible de l'élément au corps .12. Torch according to one of claims 10 to 11, characterized in that the body (46; 60; 132) has at least one housing (44, 52; 134a, 134b, 134c) for receiving and supporting an element of cup (10; 136) or heating as above, this housing ensuring both the positioning and the removable attachment of the element to the body.
13. Chalumeau selon l'une des revendications 10 à 12, caractérisé par le fait que le corps de chalumeau (46,- 60,- 132) est en acier. 13. Torch according to one of claims 10 to 12, characterized in that the torch body (46, - 60, - 132) is made of steel.
14. Chalumeau selon l'une des revendications précédentes, caractérisé par le fait que les éléments de coupe (16; 70) et de chauffe (18; 76) définissent à eux seuls ladite extrémité formant organe d'oxycoupage (4; 4a,14. Torch according to one of the preceding claims, characterized in that the cutting (16; 70) and heating (18; 76) elements alone define said end forming an oxygen cutting member (4; 4a,
4b, 4c; 64) . 4b, 4c; 64).
15. Chalumeau selon l'une des revendications 10 à 14, caractérisé par le fait que le corps (132) et les éléments de coupe (136) et de chauffe (110) définissent ladite extrémité formant organe d'oxycoupage (158) .15. Torch according to one of claims 10 to 14, characterized in that the body (132) and the cutting elements (136) and heating (110) define said end forming an oxygen cutting member (158).
16. Chalumeau selon l'une des revendications 10 à 14 , caractérisé par le fait qu'il comprend plusieurs extrémités formant organe d'oxycoupage (4a, 4b, 4c), les éléments de chauffe (18) et de coupe (16) étant solidaires d'un unique corps de chalumeau (60) . 16. Torch according to one of claims 10 to 14, characterized in that it comprises several ends forming an oxygen-cutting member (4a, 4b, 4c), the heating (18) and cutting (16) elements being integral with a single torch body (60).
PCT/FR1995/001572 1994-12-08 1995-11-29 Oxy-cutting torch WO1996018071A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42650/96A AU4265096A (en) 1994-12-08 1995-11-29 Oxy-cutting torch

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9414771A FR2727888A1 (en) 1994-12-08 1994-12-08 OXYCOUTING TORCH
FR94/14771 1994-12-08

Publications (1)

Publication Number Publication Date
WO1996018071A1 true WO1996018071A1 (en) 1996-06-13

Family

ID=9469599

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1995/001572 WO1996018071A1 (en) 1994-12-08 1995-11-29 Oxy-cutting torch

Country Status (5)

Country Link
AU (1) AU4265096A (en)
CA (1) CA2207176A1 (en)
FR (1) FR2727888A1 (en)
WO (1) WO1996018071A1 (en)
ZA (1) ZA9510443B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998053250A1 (en) 1997-05-20 1998-11-26 Michel Donze Oxyacetylene cutting apparatus
US7007737B2 (en) 2003-09-30 2006-03-07 Edw. C. Levy Co. Slab handling apparatus
US7378051B2 (en) 2003-09-30 2008-05-27 Edw. C. Levy Co. Method and apparatus for slitting steel slabs

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE249170C (en) * 1906-10-09
FR9375E (en) * 1904-11-19 1908-10-19 Oxhydrique Francaise L Process for cutting sheets, pipes and any metal objects
FR444349A (en) * 1912-05-29 1912-10-15 Joseph Desire Benegent Torch enhancements for welding and metal cutting
DE1209973B (en) * 1961-12-22 1966-02-03 Eberspaecher J Cutting torch
DE1429136A1 (en) * 1963-07-04 1969-02-06 Jakob Christ Cutting torch with exchangeable gas-mixing separate heating and cutting nozzles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR9375E (en) * 1904-11-19 1908-10-19 Oxhydrique Francaise L Process for cutting sheets, pipes and any metal objects
DE249170C (en) * 1906-10-09
FR444349A (en) * 1912-05-29 1912-10-15 Joseph Desire Benegent Torch enhancements for welding and metal cutting
DE1209973B (en) * 1961-12-22 1966-02-03 Eberspaecher J Cutting torch
DE1429136A1 (en) * 1963-07-04 1969-02-06 Jakob Christ Cutting torch with exchangeable gas-mixing separate heating and cutting nozzles

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998053250A1 (en) 1997-05-20 1998-11-26 Michel Donze Oxyacetylene cutting apparatus
FR2763668A1 (en) * 1997-05-20 1998-11-27 Michel Donze OXYCOUTING TORCH
US6261512B1 (en) 1997-05-20 2001-07-17 Michel Donze Oxyacetylene cutting apparatus
US7007737B2 (en) 2003-09-30 2006-03-07 Edw. C. Levy Co. Slab handling apparatus
US7378051B2 (en) 2003-09-30 2008-05-27 Edw. C. Levy Co. Method and apparatus for slitting steel slabs

Also Published As

Publication number Publication date
AU4265096A (en) 1996-06-26
ZA9510443B (en) 1996-07-17
FR2727888A1 (en) 1996-06-14
FR2727888B1 (en) 1997-02-14
CA2207176A1 (en) 1996-06-13

Similar Documents

Publication Publication Date Title
CA2638814C (en) Multipoint injector for turbine engine
EP1873454B1 (en) Arrangement with bayonet-type connection for gas turbine combustion chamber
EP1731839B1 (en) System for fixing an injection system to the dome of turbine combustion chamber and method of fixation
EP2566684B1 (en) Device for assembling two parts made from thermoplastic materials by means of laser-transparent welding, assembly method and associated clamping fitting
FR2755500A1 (en) MODULAR FLAME ATTACHING DEVICE FOR SELF-STABILIZED FLAME BULK MIXTURE BURNER, AND BURNER PROVIDED WITH SUCH A DEVICE
EP0933981A1 (en) Nozzle/nozzle holder arrangement for a plasma torch
WO1996018071A1 (en) Oxy-cutting torch
EP3902650B1 (en) Powder-spraying 3d optical printing head
FR2779805A1 (en) FOG INJECTOR FOR FUEL BURNER AND BURNER PROVIDED WITH SUCH INJECTOR
EP0676024B1 (en) Gas torch nozzle
EP0076188B1 (en) Cutting head, especially for an oxygen-fuel cutting torch
EP3820623A1 (en) Turbine for a fluid-ejecting device, fluid-ejecting device, and assembly comprising such a device and tool
FR2692024A1 (en) Gas burner structure - has air injector connected to Venturi tube mixer by using facing flanges with studs and curved slots which permit relative adjustment
FR2970551A1 (en) Terminal portion for fuel injector of annular combustion chamber of e.g. turbojet of aircraft, has outer pipe for supplying fuel at end, and nose injector mounted on end of outer pipe by threaded ends that are screwed with each other
EP3820627A1 (en) Turbine, fluid-spraying device, associated facility and manufacturing method
FR2814796A1 (en) TRI-TUBE BURNER FOR OVENS ESPECIALLY GLASS AND METAL, AND PROCESS FOR INJECTING FUEL AND FUEL BY SUCH A BURNER
EP0983472B1 (en) Oxyacetylene cutting apparatus
EP0928780B1 (en) Apparatus for butt-welding optical fibre preforms
EP0660039B1 (en) Burner head for gas burner, burner provided with such a head and combustion process
CA3223831A1 (en) Flame-proof and explosion-proof surface combustion gas burner
FR2958371A1 (en) Adapter for thermal cutting torch, comprises a first element and a second element joining each other, where the first element of axis comprises an upstream portion, a downstream portion, and passages of gas crossing the first element
FR2996792A1 (en) Plasma arc torch assembly, useful for cutting metallic workpiece, comprises electrode holder, nozzle holder, electrical insulator block arranged between holders, and shank forming sleeve around part or all of electrode holder and block
FR2735122A1 (en) Combustion unit, esp. for use in glass-making
FR3112591A1 (en) Flue section of the type with two concentric tubes and its method of manufacture
EP0378461A1 (en) Cutting nozzle for iron and steel processing

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AM AU BR BY CA CN CZ EE GE HU JP KG KP KR KZ LT LV MD MX PL RO RU SI SK TJ TM UA US UZ

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
ENP Entry into the national phase

Ref document number: 2207176

Country of ref document: CA

Ref country code: CA

Ref document number: 2207176

Kind code of ref document: A

Format of ref document f/p: F

ENP Entry into the national phase

Ref country code: US

Ref document number: 1997 849127

Date of ref document: 19970717

Kind code of ref document: A

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase