JPH0243576Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrode spacing adjustment mechanism for a two-electrode welding device, and particularly to an electrode spacing adjustment mechanism that can secure a large adjustment distance with a small sliding device.

One of the conditions for effective two-electrode welding is to maintain an optimum electrode spacing (hereinafter simply referred to as "electrode spacing"). In other words, the welding heat input varies depending on the diameter of the wire used, and the state of the molten pool varies accordingly, so in order to form and maintain the desired state (for example, one pool, two pools, etc.) It is absolutely necessary to optimally adjust the distance between poles depending on the wire diameter. In this case, considering the magnitude of the current used, small diameter wires require a small distance between poles (hereinafter simply referred to as "small pole distance"), and thick diameter wires require a large distance between poles (hereinafter simply referred to as "large pole distance"). is often done,
The adjustment range between poles varies depending on the wire diameter.

Now, in order to perform such a distance adjustment, a distance adjustment mechanism as shown in FIG. 1 has conventionally been used. That is, in FIG. 1, the pole spacing adjustment mechanism is
The wire feeding devices 1, 1' and the torches 2, 2' are each integrally constructed, and the wire feeding mechanisms 3, 3' are provided on the output shaft surface of the wire feeding motors 4, 4', and the output shaft They are arranged with their surfaces facing each other, and both or one of these integrated structures is provided on the sliding device 5, so that the pole distance l can be continuously adjusted by, for example, sliding the torch 2. This is what I did.
And the maximum adjustable pole distance in this adjustment mechanism
L ₁ is the difference between the maximum distance between poles l ₁ and the minimum distance between poles l ₂ , and if the torch can be slid left and right by a and b, respectively, the maximum adjustable distance between poles L ₁ is L ₁ = l ₁ − It is expressed as l ₂ =a+b. Therefore, if the adjustment pole distance is required to exceed a+b, the amount of sliding should be adjusted according to the amount that exceeds a+b.
That is, the sliding device had to be made larger, and in that case, there was a problem in that the welding device itself became large.

The present invention was developed in view of these circumstances, and its purpose is to provide a pole spacing adjustment mechanism that uses a small sliding device to enable a large pole spacing adjustment that cannot be achieved with conventional methods. be.

However, the configuration of the present invention that has achieved this purpose is that at least one of the two torches in a two-electrode welding device is arranged so as to be movable in the direction toward or away from the electrode spacing. The gist of the electrode spacing adjustment mechanism in a two-electrode welding device held by a torch holding base is that the torch holding base has a torch holding mechanism on each of the approach direction side and the separation direction side. .

The present invention will be explained below based on the drawings.

In FIG. 2, the pole spacing adjustment mechanism includes a torch holding base 7 that supports two torch holding members 6 and 6';
7' are integrally constructed and disposed in the pole distance adjustment direction, and at least one of them is provided on the sliding device 5, and furthermore, the center of the torch 2 is aligned with the center line of the torch holding base 7. The torch holding member 6 is installed so as to be equidistant from side to side, and the total of the equidistant distances corresponds to 1/2 of the slidable amount of the sliding device.

When actually making adjustments using the pole distance adjustment mechanism configured in this way, as shown in Figure 2, from the minimum value to 1/2 of the required pole distance adjustment section, the above two torch holding bases are used. The torch holding members 6, 6' are arranged adjacent to the electrodes 7, 7' in the electrode spacing direction, and the electrode spacing is adjusted using the sliding device 5 (hereinafter referred to as "small electrode spacing adjustment"). Also, 1/2 of the required pole distance adjustment section
to the maximum value, as shown in FIG. 3, the torch holding member 6 provided on one of the torch holding bases 7 is attached to the opposite side of the electrode separation of the torch holding base 7 while satisfying the above-described structural requirements. In this state, the sliding device 5 adjusts the distance between the poles (hereinafter referred to as "large pole distance adjustment").

Therefore, the maximum adjustable pole distance in this adjustment mechanism is
L ₂ is the difference between the maximum distance between poles l ₁ ′ and the minimum distance between poles l ₂ ′, and if the torch can be slid left and right by a and b, respectively, the maximum adjustable distance between poles L ₂ is L ₂ = l _1' - _l2 '=(a+b)+2C... [C is the distance between the centers of the torch holding base 7 and the torch 2].

On the other hand, from the above-mentioned structural requirements, it can be expressed as C=1/2(a+b)... So, by substituting the formula into the formula, we get L ₂ =2(a+b). That is, the sliding device 5
If the slidable amount in is (a+b), it means that the gap can be adjusted by exactly twice as much as 2(a+b).

Therefore, the conventional gap adjustment mechanism uses a sliding device that can provide a sliding amount corresponding to the gap adjustment amount (a + b) required for welding, but the gap adjustment mechanism of the present invention Since it is sufficient to provide a sliding device capable of sliding by half (a+b), the welding device can be made smaller and lighter.

In the above explanation, switching between the small pole distance adjustment and the large pole distance adjustment was carried out by attaching the torch holding member 6 to the opposite side of the torch holding base 7, but as shown in FIG. The torch holding members 6a and 6b are installed in advance in symmetrical positions that satisfy the above-mentioned structural requirements, and the torch 2
It is also possible to perform this by changing the attachment of the torch 2, and it is also possible to adopt a configuration in which the torch 2 is rotated and moved to a symmetrical position.

It should be noted that this adjustment mechanism can be employed regardless of whether the torch and wire feeding device are integrated into a welding device or a welding device which is a separate device.

Since the present invention is structured as outlined above,
A large amount of adjustment between electrodes can be obtained with a small sliding device, which not only helps in reducing the size and weight of the two-electrode welding device, but also allows for a wider adjustment range of electrodes, which widens the selection range of welding conditions. In particular, it is easy to obtain a device for adjusting the gap between poles that matches the wire diameter and welding current conditions, and its practical value is high.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing a conventional pole spacing adjustment mechanism, FIGS. 2 and 3 are schematic explanatory diagrams illustrating a pole spacing adjustment mechanism according to the present invention, and FIG. 4 is a diagram showing a modified example. . 1, 1'... Wire feeding device, 2, 2'... Torch, 3, 3'... Wire feeding mechanism, 4, 4'... Wire feeding motor, 5... Sliding device, 6, 6'...
Torch holding member, 7, 7'...torch holding base,
l ₁ ′... Maximum distance between poles in the mechanism according to the present invention, l ₂ ′...
...The minimum distance between the poles in the same mechanism as above, L ₂ ...The maximum adjustable distance between the poles in the same mechanism as above.

Claims (1)

[Claims for Utility Model Registration] Two-electrode welding in which at least one of the two torches in an electrode welding device is held by a torch holding base that is movable in the direction toward or away from the electrode gap. An electrode spacing adjustment mechanism in a two-electrode welding device, wherein the torch holding base includes a torch holding mechanism on each of the approach direction side and the separation direction side.