JPS6350078Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a welding torch applied to narrow gap welding, and more specifically to a consumable electrode feeding guide and shield that are inserted deeply into the narrow gap welding line. Install the gas nozzles so that their relative positions can be changed freely.
This invention relates to a welding torch configured to be freely movable even within a narrow gap.

[Conventional technology]

For example, when welding a narrow gap formed by a thick plate, a welding apparatus using a shield gas nozzle inserted into the groove as shown in FIG. 1 is widely used. That is, in such a welding device, the welding torch 5
In order to insert the tip end into the narrow gap welding line 1, the shielding gas nozzle 3 and the consumable electrode feeding guide 2 are each formed flat, and are arranged integrally in one row along the welding line 1 (Fig. Then, place the shield gas nozzle 3 in front and rear with the guide 2 in between),
Care is taken to prevent a part of the welding torch 5 from coming into contact with the base metals on both sides within the narrow gap, and the shielding gas jetted from the shielding gas nozzle 3 is sufficiently supplied before and after the arc to stabilize the arc.

[The problem that the idea aims to solve]

By the way, in the case of the conventional welding method in which the shielding gas nozzle 3 is not inserted into the groove, a circular cross section is usually used, and the shielding gas nozzle 3 is fixed to the consumable electrode feeding guide 2 by screwing. However, if the welding torch is formed to be elongated in the direction of welding progress as described above in order to enable insertion into the groove, the shield gas nozzle 3 cannot be attached by screwing, which makes it impossible to specify the direction. It cannot be positioned and fixed in a position where it can be inserted reliably into a narrow gap.

Also, as welding progresses and several layers of buses are formed and the groove becomes shallow, the shielding effect of the welding base metal from both sides decreases and outside air is drawn in from around the torch. It is required to convert the shielding gas nozzle into a box-shaped shielding gas nozzle to ensure the shielding effect, but in order to do so, it is necessary to easily remove the groove-inserted shielding gas nozzle from the consumable electrode feeding guide. There is a need.

Furthermore, if the welding line is curved in a certain curve, as shown in Figure 2, with a conventional narrow gap welding torch in which the consumable electrode feeding guide and the shielding gas nozzle are integrally formed, the holding Even if the direction of the shield gas nozzle is adjusted at part 8a, it cannot be aligned with the welding line, so the nozzle may collide with the base metal on both sides and be damaged, or in extreme cases, it may not be inserted into the groove itself. Sometimes it is possible.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to easily attach and detach a shield gas nozzle applied to narrow gap welding and insert it into a narrow gap. The purpose of this project is to provide a welding torch that can perform the following tasks.

[Means to solve the problem]

The configuration of the present invention that has achieved this objective is that, in a welding torch that moves while performing gas-shielded arc welding on a narrow gap weld line, welding is performed forward and backward in the welding direction across the consumable electrode feeding guide. A pair of shield gas nozzles each configured as an independent separate body is provided, and each shield gas nozzle is rotated through a pair of clamping and holding mechanisms that are independently rotatable about the consumable electrode feeding guide. The gist is that it is detachably attached to the feeding guide.

[Function and Examples]

The configuration and effects of the present invention will be explained below based on the drawings. However, the following embodiments are merely representative examples, and the shapes of the consumable electrode feeding guide and the shielding gas nozzle may be changed in order to achieve the above and later purposes. All of these are included within the technical scope of the present invention.

FIG. 3 is a side view showing the welding torch 5 according to the present invention, FIG. 4 is a plan view, and FIG. 5 is an explanatory view showing how the torch 5 is attached. It is held in a pinching manner. The welding torch 5 has a pair of shield gas nozzles 3a and 3b on both sides of the consumable electrode feeding guide 2.
These gas nozzles 3a, 3
The top of b is the header base 13a, 13, respectively.
attached to b. Also, the header base 1
3a, 13b are attached to the upper part of the consumable electrode feeding guide 2 so as to be able to rotate independently, and are provided with an inlet 9 for shielding gas to be introduced into the gas nozzles 3a, 3b, and a connecting port 10 for circulating cooling water. The inlet 9 and connection port 10 are connected to the gas nozzle 3 via the header bases 13a and 13b.
It communicates with a and 3b. 9a is a gas outlet formed in the gas nozzle 3.

On the other hand, as shown in FIG. 5, the torch 5 has a cylindrical portion 2a formed at its upper portion, and a flange portion 2c formed at the lower portion of the cylindrical portion 2a. Then, the header bases 13a and 13b are attached to the cylindrical portion 2a.
When attaching these, as shown in FIG. 4, a bay part is formed on one side of the header bases 13a, 13b along the outer peripheral surface of the cylindrical part 2a, and
Similar bays are provided on pressure contact plates 14a and 14b provided opposite to the bay, and these bays are opposed to embrace the cylindrical portion 2a, and the tightening bolts 14c and 14c are
(one of which is not shown) is pressed against and clamped with these. Therefore, in this example, the header bases 13a, 1
The curved portion 3b is combined with the pressing plates 14a, 14b and the tightening bolts 14c, 14c to form a pair of clamping and holding mechanisms. Then, when the bolt 14c is loosened, the header bases 13a and 13b are attached to the flange 2.
Since it is supported by c,
Each can be freely rotated and positioned independently. Further, although the consumable electrode feeding guide 2 is shown as having a flat shape, it may be of a cylindrical shape similar to the conventional one. On the other hand, consumable electrode feeding guide 2
The upper portion of the cylindrical portion 11 of the cylindrical portion 2a is held by a gripper 12 provided at the tip of the holding arm 8. Furthermore, gas nozzles 3a and 3b are shown as being installed on both sides of the consumable electrode feeding guide 2, but if the start or end of the groove is a dead end, it is recommended to remove either the front or the rear. . In addition, when installing the header bases 13a, 13b, pressure contact plates 14a, 14b are shown, but clamping plates 15a, 15b (one is not shown in the drawing) as shown in FIG. 6 (plan view) are shown. (not shown) may be attached to both sides of the bay parts of the header bases 13a, 13b, and may be press-fitted and held so as to slide on the outer peripheral surface of the cylindrical part 2a. In this way, pressure contact plate 1
4a and 14b are no longer necessary, and it can be freely rotated and held in any direction. Therefore, the clamping and holding mechanism in this case is based on the header base 13.
It is composed of the bay parts a and 13b and the clamping bullet plates 15a and 15b.

The header pipe 16, which is formed across the header bases 13a and 13b, has nozzles 3a and 13b.
3b needs to be bent at an arbitrary angle by adjusting the displacement thereof, for example, a flexible pipe 21 (a flexible north or the like may be used) as shown in the figure is disposed in the header pipe 16. Therefore, as shown in FIGS. 7 and 8, the header bases 13a, 1
Even if 3b is bent from a straight shape to a dogleg shape, the flow of the shielding gas and cooling circulating water passing through the pipe 16 is not obstructed. In this way, in the present invention, the nozzles 3a and 3b attached to the front and back with the consumable electrode feeding guide 2 in between can be bent, so they can be moved along the curved welding line 1'. Not only can it be applied to a curved narrow-gap welding line 1', which was conventionally considered impossible, but there is no possibility that parts of the nozzles 3, 3 would come into contact with the inner wall surface of the narrow-gap and be damaged. Furthermore, in the present invention, the nozzles 3a and 3b can be separated from the guide 2 simply by removing the pressure contact plates 14a and 14b, so conversion to the box-shaped shield gas nozzle described above can be carried out extremely easily, and in this case, the consumable electrode feeding is unnecessary. There is no need to remove the feed guide 2 from the holding arm 8 one by one. An insulating piece 17 is interposed on the outer surface of the cylindrical portion 2a of the consumable electrode feeding guide 2 held between the header bases 13a, 13b and pressure contact plates 14a, 14b to prevent leakage of the current flowing through the consumable electrode feeding guide 2. It is desirable to prevent this.

On the other hand, it would be more convenient if these bending changes could be made freely by loosening the tightening bolts 14a, 14b and using thumbscrews.
As a means for this purpose, for example, a configuration as shown in FIG. 9 is adopted. That is, a fan-shaped worm gear 18 is provided concentrically with the cylindrical portion 2a on one header base side.
A worm is attached to a bracket 20 extending from the gripper 12 or other fixing member and engaged with the worm gear 18. Numeral 19 is a knob provided on the worm, and when the worm gear 18 is rotated by rotation of the knob 19, the header bases 13a and 13b attached thereto are rotated in a free direction. With this construction, the welding head can be bent very easily and can be aligned along the curved welding line 1' (FIG. 8). Furthermore, even if the curvature of the weld line changes midway, the displacement angle of the nozzle can be adjusted even during welding by simply operating the knob 19, so welding workability will not be degraded.

[Effect of idea]

Since the present invention is constructed as described above, it is extremely easy to attach and detach the guide and nozzle, and to adjust the position.

Even if the weld line is curved, the displacement can be adjusted along the curved state.

Since contact with the inner surface of the groove can be prevented, the nozzle will not be damaged.

Only the nozzle can be replaced without removing the guide.

Various effects can be obtained.

[Brief explanation of the drawing]

Figure 1 is a side view illustrating a conventional welding device, Figure 2 is a schematic view of the welding line seen from above, and Figures 3, 4, and 5
The drawings illustrate the welding torch of the present invention; Fig. 3 is a side view, Fig. 4 is a plan view, Fig. 5 is a perspective view, and Fig. 6 is a plan view showing another embodiment of the invention; 7,
FIG. 8 is a perspective view showing the case where the present invention is applied to a narrow gap weld line, and FIG. 9 is a perspective explanatory view illustrating a header base turning mechanism. 1... Narrow gap welding line, 2... Consumable electrode feeding guide, 3... Shield gas nozzle, 5... Welding torch, 6... Welding cart, 8... Holding arm.

Claims (1)

[Scope of utility model registration request] As the welding torch moves while performing gas-shielded arc welding on a narrow gap welding line, the welding torch moves forward and backward in the welding direction across the consumable electrode feeding guide.
A pair of shield gas nozzles each configured as an independent separate body is provided, and each shield gas nozzle is rotated through a pair of clamping and holding mechanisms that are independently rotatable about the consumable electrode feeding guide. A welding torch for narrow gap welding, characterized in that it is detachably attached to the feeding guide.