DE1629940A1 - Autogenous welding torch - Google Patents

Description

Priority France 17.6.66.

COMMISSARIAT AL ¹ ENERGY ATOMIQUE,
Paris, France.

Oxy-fuel welding torch "

With the oxy-fuel welding torches used today, the supply device generates both when igniting and when it is ignited carbon deposits when the flame is extinguished,

The improvements to the oxy-fuel welding torches naoh dor invention consist in a supply with combustible Qas and oxygen carriers in fixed and adjustable Proportions and electrical spark ignition of the combustible mixture inside the feed nozzle, synchronized with the progressive inflow of the mixture to accomplish.

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Such an oxy-fuel welding torch according to the invention allows instant ignition without generating soot of a pre-mixed flame that is hard and has a high temperature.

The carbonaceous deposits are avoided in this way both when igniting and when extinguishing the flame by the progressive flare-up and disappearance of the flame, which is determined beforehand by a mixture, whose concentration is precisely determined and stable.

The improved device according to the invention also allows a variable speed of execution of opening and closing, complete independence of regulation in the delivery of the flammable Media and oxygen carriers, a controlled adjustment to achieve each of the media during opening and closing, these adjustments without Disassembly are accessible. These features allow an immediate and reproducible ignition of a previously to achieve the mixture obtained.

According to the invention, the control needles are for the Supply line of the Qase firmly connected to a bracket that is actuated by a drive element and with a Contactor organ cooperates, which controls the electrical ignition device of the combustible mixture, wherein

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Regulatory bodies on the one hand the position of the Ensure needles opposite the bracket and, on the other hand, the control of the inlet opening of the gases.

Further features and advantages of the invention result from the following description of an embodiment shown in the accompanying schematic drawings.

Fig. 1 is a schematic view of the feed line and Ignition device of an oxy-fuel welding torch according to the invention,

Fig. 2 is a top plan view of an embodiment of a Supply and ignition device for an oxy-fuel welding torch according to the invention,

Fig. 3 is a sectional view along the line HI-III of Fig. 2,

Fig. 4 is a sectional view along the line IV-IB of Fig. 2,

Fig. 5 is a sectional view taken along line V-V of Fig. 2;

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Pig. β is a front view showing in detail the contactor member and its control device shows, and

Figure 7 is a sectional view of an embodiment a seal.

The supply and ignition device shown schematically in Fig. 1 has a pneumatic drive organ. 1, which consists of a piston 2 which moves in a cylinder 2 and is acted upon on both surfaces by a medium which is introduced into the cylinder through lines 4 and 5 which are connected to a five-way valve 6 which allows the lines 4 and 5 to be alternately connected to a source of compressed medium through a line 7 and a vent 8. In this way, one of the surfaces of the piston 2 is exposed to the pressure of the medium, while the other surface is in communication with the outside air. The piston 2 is connected by a hollow rod 9 to a bracket, which has holes 11, 12, 1J> with internal thread, into which the threaded heads 14, 15, 16 of needles I7, 18, I9 engage, which in this way are firmly attached to the bracket 10 are connected. The needles I7 and I9 are slidably mounted in guide sleeves 20, 21, the lower parts 22, 25 of which, forming a bush, are rotatably mounted in cylindrical bearings 24 bored into a valve body 26

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are. The needle 18 is slidable inside the hollow rod 9 of the piston and arranged in an extension 27 of the cylinder 3, which is in a bearing 28 of the Valve body 26 engages.

The needle 17 controls through its end 29, which forms a tip, the delivery of the acetylene through a feed line 30a and a discharge line 30b flows, the needle '18 controls the release of the operating air through its end jjl, which flows through a supply line 32a and a discharge line 32b and the end 33 'of the needle I9 controls the oxygen, which flows through a supply line 34a and a discharge line 34b.

The 'PUhrungshUlsen 20 and 21 have at their lower end 22, 23, which form a socket, an opening 35, J> 6 , which ensures the connection between the supply line of the oasis and the discharge. By rotating the sleeves 20 and after a certain angle, the opening width of the feed line opening and, accordingly, the delivery of the gas is changed.

A first adjustment of the needles I7, 18, I9 in the depth given by screwing the heads 11, 12 and on the bracket 10 with the help of the knurled buttons 37, and 39 and a second regulation through the guide sleeves 20, 21, which are shifted by rotation to a certain opening width of the openings of the supply lines 30a and 34a.

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These two adjustments make it possible to determine the corresponding outputs of the media that are used in the simultaneous Displacement of the three needles I7, 18, I9 under the action of the pneumatic drive element 1 are retained.

After the device shown in Fig. 1 is in In the closed position of the lines and the aforementioned adjustments have been made, the line will be closed in connection with the compressed air source and the line 4 connected to the vent opening, so that the piston is moved in the direction of arrow A and at the same time the bracket 10 and the needles 17, 18, I9 raises the Openings of the supply lines 30a, 52a and 34a for supplying of the flammable gases and the oxygen carrier in the oxy-fuel soap burner release.

At a certain position of the needles I7, 18, I9, the corresponds to the ignition of the oxy-fuel welding torch the piston 2, which is controlled by the electric tap 6, is stopped and at the same time the bracket 10 comes into contact with a contact member 40, which in a known manner, the electrical ignition device of the oxy-fuel welding torch controls.

For the loosening of the flame of the oxy-fuel welding torch, the supply of the lines 4 and 5 is reversed so that the piston 2 in the reverse direction of the arrow A

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and also, the bracket 10 and the needles I7, 18, I9 taken which close the openings of the supply lines JOa, 32a and 34a.

In Figs. 2, 3, 4 and 5 there is an embodiment of the improved Device according to the invention shown in which the main elements described in Fig. 1 can be found again are. The cylinder 3 consists of a body 41, which at its lower end by a screw cap 42 below Intermediate connection of a seal 43 is closed, wherein a seal 44 is also arranged between the piston rod 9 and the through opening in the screw cap 42. The body 41 of the cylinder is attached to the valve body by screws 45 »

The upper end of the needles I7 and I9 is in a sleeve 46, held by means of adjusting screws 48, 49, wherein the sleeves 46, 47 have an external thread to nuts 50, 50a and 51, 51a to include the attachment of the sleeves 46, 47 and accordingly the needles I7, I9 on the Ensure bracket 10. By adjusting the sleeves and the nuts it is possible to change the position of the needles.

The needle 18, which is mounted in the hollow rod 9 of the piston, is on a sleeve by an adjusting screw 52 attached, which in turn on the threaded end 54 of the hollow rod 9 together with a lock nut

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is screwed. The bracket 10 is between the sleeve 53 and the nut 55 clamped in such a way that the needle 18 is displaced in relation to the bracket 10 and the hollow rod 9.

To adjust the angle of the guide sleeves 20, 21, they are provided with lugs 56 at their lower end; 57, which have openings 58, 59, into which screws 60, 61 engage, which are fastened in the body 26 of the oxy-fuel welding torch.

On the lower part 29, .Jl and 33 of the needles I7, 18, I9, the Form a point, the seals 62, 62 a are arranged, which are separated by a spacer 63. These seals are arranged in a bearing point 64, which is in the guide sleeves 20, 21 and in the extension 27 of the Cylinder 3 are provided. The top seal 62 ensures the seal around the needle to prevent leakage to prevent outside, and the lower seal 62a represents the seat of the tip.

The bracket 10 is laterally extended by a claw 65 on which a rod 71 with a cam 72 is fastened by sleeves 70, 70a, said rod 7I being guided at its lower part by a bearing 73. The rod 72 cooperates with a roller "Jk of a micro -contact 66 of a well-known type. When the cam 72 is displaced, it comes into contact with it

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the roller 74, which acts on the microcontact 66 in such a way that that the electrical ignition device of the oxy-fuel welding torch is activated.

In Pig. 6 is shown in section a preferred embodiment of a seal used in the device according to the invention, this seal consisting of a ring 6j of elastic material, in particular of rubber, which on one of its faces in contact with a movable surface 68 with a set made of a self-lubricating material, in particular "Teflon", which ensures a satisfactory sliding of the parts and prevents sticking, any lubrication being unnecessary so as to meet the safety requirements.

Of course, the invention is not limited to the illustrated and described in detail embodiment, since various changes may be made without departing from the scope of the invention e _r

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Claims (1)

JO Claims. 1.) Oxy-fuel welding torch with at least one supply ' with combustible gas, at least one feed with an oxygen carrier and at least one feed with operating gas, which are each controlled by a needle, during which one with a pointed end can adjust the passage opening of the gas, and with an electrical ignition device for the combustible mixture, characterized in that the gas supply control needles (I7, 18, I9) are firmly connected to a bracket (10) which is actuated by a drive element and cooperates with a contact body that the electric igniter of the combustible. Mixing controls, with adjusting devices on the one hand the adjustment of the needles opposite the bracket and, on the other hand, the control of the inlet opening of the gases. 2.) Oxy-fuel ^ welding torch naoh Anspruoh 1, thereby characterized in that the drive member actuating the bracket consists of a piston (2) whose piston rod (9) is fixed is connected to the bracket (10), the piston (2) being arranged in a cylinder (}) resting on its surfaces exposed to the action of a medium whose supply line i "0 9 ~ 81 1/00 21 MDORB.NAL is controlled by a multi-way valve (6). j5.) Oxy-fuel welding torch according to claim 1, characterized in that characterized in that the adjusting device, which adjusts the setting of the needles (I7, 18, I9) with respect to the bracket (lo) ensures from a threaded head (14, 15, 16) of the needles which is inserted into a hole with an internal thread (11, 12, I5) of the Bracket is screwed in, with a set screw securing the locking of each needle on the bracket. 4.) Oxy-fuel welding torch according to claim 1, characterized in that the regulating device which the Adjustment of the needles (17, 18, I9) in relation to the bracket (10) ensures, consists of a sleeve (46, 47, 53), wherein the needle is fixed by a set screw (48, 49, 52), said sleeve being screwed into a hole in the bracket (lO) and having a thread on the outside onto which two nuts clamping the bracket are screwed on. 5.) Oxy-fuel welding torch according to claim 1, characterized in that the control device of the gas supply line opening consists of a socket (22, 23, 28), which is rotatably mounted at a certain angle in the body of the oxy-fuel welding torch (26), the Bushing has a central bore in which the needles (17, 18, I9) are slidably mounted and on the one hand is connected to the discharge opening and on the other hand through a lateral opening with the supply opening. M 1/0021 ^8ÄD Hi 6.) Oxy-fuel welding torch according to claims 1 to 5, characterized in that the seals consist of a ring made of elastic material (67), which on one of its surfaces in contact with the moving part with a seal (69) made of self-lubricating Material is in contact. -12- 10 9 8 11/0021