JPH0994663A - Welding torch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a welding working more widely by exchanging only a partial part of a welding torch without exchanging the welding torch and an attached cable. SOLUTION: A welding torch is composed of a torch body 10, a cooling nozzle base 4 and a nozzle 13. In the cooling nozzle base 4, a cooling tube 1 arranged on the internal circumference, an introduce side joint 2 connected to the cooling tube 1 and a discharging side joint are installed. The cooling nozzle base 4 has the interchangeablity for attaching a nozzle base (without showing) of an air cooling system welding torch, thereby being easily exchanged in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding torch used for welding work.

[0002]

2. Description of the Related Art In recent years, water-cooled welding torches are often used in addition to the conventional air-cooled welding torches in arc welding operations depending on the welding current and the welding continuous time for the target workpieces.

FIG. 5 is a block diagram of an embodiment in which a conventional water-cooled welding torch is held by a robot device, and FIG. 6 is an external view of an embodiment of the conventional water-cooled welding torch.

As shown, a manipulator 50 has a torch holder 51 attached to its tip, and a water-cooled welding torch 52 is held therein. The water-cooled welding torch 52 has a water supply hose 32 for cooling water and a drain hose 3
3, a gas tube 53 for shield gas, an air tube 54 for passing air for a clamp device (not shown) provided in a water-cooled welding torch 52 for fixing a consumable electrode wire (hereinafter, referred to as wire) 18, A control cable 56 for controlling the clamp device and a torch cable 55 including the wire 18 and the like are connected. Reference numeral 57 denotes a wire feeding device, which feeds the wire 18 held by the wire reel stand 58 to the water-cooled welding torch 52 by driving the motor. A cooling water device 59 manages the amount of cooling water.

Regarding the water-cooled welding torch 52, a nozzle 42 is attached to the nozzle body 41,
Is attached to the torch body 30 by a cap nut 40. Reference numeral 31 is an introduction-side joint, which connects the water supply hose 32 and one end of a main body cooling pipe (not shown) in the main body cooling section 34. Reference numeral 35 denotes an intermediate joint, which connects the other end of the main body cooling pipe and a relay hose 36, and a relay connector 38 is attached to the relay hose 36. Reference numeral 39 is a nozzle connector for connecting the nozzle cooling pipe 37 and the relay hose 36 via the relay connector 38. The nozzle cooling pipe 37 is a cooling unit (not shown) in the nozzle body 41.
, And from the other end to a drain hose 33 via a drain nozzle pipe (not shown) and a connector (not shown).

With the above structure, cooling water is supplied from the water supply hose 32 to the water-cooled welding torch 52 by the cooling water device 59, and the vicinity of the torch body 30 is cooled by the cooling pipe (not shown) inside the body cooling unit 34. Then, the inside of the nozzle body is cooled by the nozzle cooling unit (not shown) in the nozzle body 41 via the relay hose 36 and the nozzle cooling pipe 37, and the cooling water device is passed through the drainage nozzle pipe (not shown) and the drainage hose 33. Go back to 59. Hereinafter, this operation is repeated.

[0007]

When such a conventional water-cooled welding torch 52 has a water-cooled dedicated torch structure, the air-cooled welding torch (not shown) is replaced with the water-cooled welding torch 52. In addition to the installation of the water supply hose 32 and the drain hose 33, the air-cooled welding torch, ancillary cable (not shown) and the like are water-cooled welding torches 52, gas tubes 53, and air tubes that are equivalent to those for water cooling. 54, the control cable 56, and the torch cable 55 had to be replaced, and the replacement work took a lot of time.

The present invention solves the above problems.
The present invention provides a welding torch that can be easily changed from an air cooling type to a water cooling type.

[0009]

In order to achieve this object, the welding torch of the present invention is a cooling pipe that circulates a cooling medium in the inner periphery when the air cooling type is changed to the water cooling type by the welding current and the welding continuous time. A cooling nozzle base having a cooling structure in which an inlet and an outlet of the cooling pipe are provided on the outer periphery is provided,
When air cooling is used, a nozzle base without a cooling structure is attached.

[0010]

According to the present invention, by providing the air-cooling and water-cooling nozzle bases with the above-described structure, it is possible to easily supply the air-cooling type and water-cooling type welding torch without exchanging the welding torch. You can

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
This will be described with reference to 3 and 4.

In FIGS. 1, 2, 3, and 4, reference numeral 4 is a cooling nozzle base, on the inner periphery of which a cooling pipe 1 having a surface area as large as possible is arranged. Reference numeral 2 denotes an introduction side joint, which is connected to the inlet 8 of the cooling pipe 1 and is provided on the outer circumference of the cooling nozzle base 4. A discharge side joint 3 is connected to the outlet 9 of the cooling pipe 1 and is provided on the outer circumference of the cooling nozzle base 4. It should be noted that both joints are provided close to the far side of the torch.

Reference numeral 5 is a water supply hose connected to the introduction side joint 2, and 6 is a drainage hose connected to the discharge side joint 3.
13 is a nozzle, which is attached to the cooling nozzle base 4,
An insulating housing 14 is fixed to the torch body 10 with a cap nut 15. The insulating housing 14 is provided with three mounting holes at equal intervals, and the cooling nozzle base 4 is provided with six mounting screws at equal intervals.
The insulating housing 14 and the cooling nozzle base 4 are attached and fixed by a hexagon socket head cap screw 16.

Further, a pin hole is formed right next to the insulating housing 14 in which three holes are formed at equal intervals for the bolt through holes so as not to come into contact with the insulating housing 14, and the pin of the insulating housing 14 is projected so that the positioning pin 7 projects. It is inserted and fixed in the hole. The torch body 10 is provided with a groove or a hole for receiving the protrusion of the positioning pin 7 inserted and fixed in the insulating housing 14.

Reference numeral 11 is an electrode rod, which is connected to the inside of the torch body 10, and 12 is a contact tip, which is attached to the electrode rod 11. Reference numeral 17 is a cooling nozzle base 4 and an electrode rod 1.
In the space formed between 1 and 1, it becomes a passage for the shield gas. 18 is a consumable electrode wire (hereinafter referred to as a wire),
20 is a target work, and an arc 19 is generated between the two.

The operation of the welding torch constructed as above will be described below. In arc welding, the supplied shield gas is diffused to the tip of the torch through the space 17, and in this state, the similarly supplied wire 18 is contact-powered by the contact tip 12 to form an arc with the target work 20. generate. Wire 18 due to the arc heat
Is melted to join the target works 20, and argon is generally used as a shield gas.

The arc heat generated from the arc 19 heats the contact tip 12, the electrode rod 11 and the like by heat conduction, and is further conducted to the insulating housing 14 and the torch body 10. In addition, the arc 19 causes the nozzle 1 to
3 is heated, and the cooling nozzle base 4 is also heated.

The cooling water flows from the water supply hose 5 through the introduction side joint 2 to one end of the cooling pipe 1, and is discharged from the drain hose 6 through the discharge side joint 3 from the other end. Hereinafter, this is repeated, and the cooling pipe 1 is cooled by cooling water. Then, the cooling nozzle base 4 and the electrode rod 11 heated by the arc heat are cooled. Thereby, the insulating housing 1
4, the heat rise of the torch body 10, the contact tip 12, the nozzle 13, etc. is also suppressed.

When the welding torch is installed in the robot apparatus, the water supply hose 5 and the drain hose 6 of the welding torch may come into contact with the torch body 10 and the both hoses 5, 6 cannot be installed. In this case, the insulating housing 14 and the cooling nozzle base 4 are attached to each other by the three mounting holes of the insulating housing 14 and the six mounting screws of the cooling nozzle base 4.
Can be adjusted to a desired position so that the both hoses 5 and 6 do not come into contact with the torch body 10.

When the nozzle 13 is consumed and needs to be replaced, the positioning pin 7 of the insulating housing 14 allows the nozzle 13 to be replaced smoothly without changing the positions of the inlet side joint 2 and the drain side joint 3 adjusted as described above. be able to.

As described above, according to the welding torch of the embodiment of the present invention, since the cooling nozzle base 4 has the cooling function, efficient welding work can be performed. That is, when the welding torch is changed from the air cooling type to the water cooling type, since the welding torch itself has conventionally been provided with a cooling function, it is necessary to replace the welding torch set. At that time, the torch cable connected to the welding torch and the accompanying cables such as the gas tube had to be replaced at the same time. However, the welding torch of the present embodiment becomes a water-cooled type by simply connecting the water supply hose 5 and the drain hose 6 if only the cooling nozzle base 4 is replaced, and from an air-cooled type to a water-cooled type welding torch in a very short time. A wide range of welding current,
Welding work can be performed smoothly during the welding time.

Further, as described above, the introduction side joint 2 and the discharge side joint 3 can be adjusted to desired positions, and even when the nozzle 13 is replaced, the position of the introduction side joint 2 and the discharge side joint 3 can be adjusted by the positioning pin 7. You can do it smoothly without changing.

In this example, cooling water is used as the cooling medium, but other cooling medium (for example, volatile gas) may be used.

Alternatively, the insulating housing 14 may be provided with 6 mounting holes at equal intervals, and the cooling nozzle base 4 may be processed with 3 mounting screws at equal intervals.

[0025]

As is apparent from the above description, according to the present invention, since the cooling nozzle base of the welding torch has a cooling function, the welding torch and the accompanying cable connected to the welding torch are replaced. In addition, since it can be easily and quickly changed from an air-cooled type to a water-cooled type welding torch, efficient welding work can be performed and maintainability is excellent.

Further, one of the insulating housing and the cooling nozzle base is provided with fixing bolt through holes, and the other is provided with screw holes at equal intervals, which are connected to a cooling water passage provided on the outer periphery of the cooling nozzle base. The introduction side joint and the discharge side joint can be adjusted and fixed at desired positions.

Further, by fixing the torch body and the insulating housing with positioning pins as a detent for the insulating housing, the nozzle can be smoothly replaced with the introduction side joint and the discharge side joint of the cooling nozzle base fixed. Is what you can do.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a welding torch of the present invention.

FIG. 2 is an external view of an embodiment of the welding torch of the present invention.

FIG. 3 is a horizontal sectional view of a cooling pipe of an embodiment of the welding torch of the present invention.

FIG. 4 is an explanatory view of a cooling pipe of an embodiment of the welding torch of the present invention.

FIG. 5 is a configuration diagram of an embodiment in which a conventional water-cooled welding torch is held by a robot device.

FIG. 6 is an external view of an example of a conventional water-cooled welding torch.

[Explanation of symbols]

 1 Cooling Pipe 2 Inlet Side Joint 3 Discharge Side Joint 4 Cooling Nozzle Base 5 Water Supply Hose 7 Positioning Pin 8 Cooling Pipe Inlet 10 Torch Body 11 Electrode Rod 12 Contact Tip 13 Nozzle 14 Insulation Housing 15 Cap Nut 16 Hexagon Socket Head Cap Screw 17 Space (shield gas passage) 18 Consumable electrode wire 19 Arc 20 Target work

Claims (8)

[Claims] 1. A cooling nozzle base provided between a torch body and a nozzle, and a cooling pipe for circulating a cooling medium provided on an inner circumference of the cooling nozzle base, and an outer circumference of the cooling nozzle base. A welding torch provided with an inlet and an outlet for the cooling pipe. 2. The cooling pipe is divided into two in the longitudinal direction of the cooling nozzle base, one end of the divided cooling pipe is connected to an inlet, and the other end of the cooling pipe is connected to an outlet, The inlet and the outlet are provided at one end in the longitudinal direction of the cooling nozzle base, and the other end of each of the cooling pipes divided into two at the other end in the longitudinal direction of the cooling nozzle base is connected.
The welding torch according to claim 1, wherein the cooling pipe is continuous from the introduction port to the discharge port. 3. The welding torch according to claim 1, further comprising fixing means for fixing the introduction port and the discharge port at desired positions on the outer circumference of the cooling nozzle base. 4. The welding torch according to claim 1, wherein the introduction port and the discharge port are close to each other. 5. The welding torch according to claim 1, wherein the introduction port and the discharge port of the cooling nozzle base are provided far from the torch tip. 6. An independent mounting portion for mounting the cooling nozzle base to the torch body is provided between the cooling nozzle base and the torch body, and the cooling nozzle base and the mounting portion are equidistant on either side. The welding torch according to claim 1, wherein N times (N is an integer of 1 or more) mounting screws are provided in the mounting hole and the other. 7. An independent mounting portion for mounting the cooling nozzle base to the torch body is provided between the cooling nozzle base and the torch body, and the cooling nozzle base and the mounting portion are equidistant to each other. The welding torch according to claim 1, wherein N times (N is an integer of 2 or more) mounting holes are provided in the mounting screw and the other. 8. The rotation preventing mechanism is provided in the mounting portion.
Or the welding torch according to 7.