JPS5856064Y2 - Welding strip electrode energizing device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an energizing device that ensures uniformity of energization to a welding strip electrode and does not damage the strip electrode.

The automatic welding method using a strip electrode is widely used mainly in the field of overlay welding because of its advantage in that a wide weld bead can be obtained in one pass.

Therefore, when using a strip-shaped electrode, it is naturally required to provide a bead of uniform width and thickness, and it is extremely important to ensure uniformity of current supply to the electrode.

However, the conventional energization methods are roughly as shown in FIGS. 1 and 2, and both have the following drawbacks.

That is, FIG. 1 is a sectional view showing a mechanism for slightly bending the arm of the band-shaped electrode 1 and pressing the current-carrying bodies 2, 2' held by the holding members 5, 5' from both sides thereof. The spring 3 may be placed on the holding member 5' side, and if necessary, it may be provided on both sides to apply strong pressure.

However, with this method, the current carrying body 2゜2' wears out severely,
The disadvantage is that if localized wear occurs, uniform current flow is impaired.

Furthermore, since the size of the current-carrying body is as large as the width of the strip electrode, the cost increases, and if the current-carrying body is replaced every time the local wear occurs, the cost will further increase.

Figure 2 shows multiple small current-carrying chip pieces 4 (4a in the figure).
It is a sectional view showing a mechanism for pinching 8 pieces of 4h) from both sides of the strip electrode 1 so as to face each other.

However, with this method, the current flows intensively, for example from 4a to 4b and from 4C to 4d of the current-carrying chip pieces, and the current density is extremely higher than that in FIG.

Presumably, as a result of the combined influence of these factors, an accident occurs in which the strip electrode 1 is cut in the longitudinal direction, and an arc and a weld bead are disturbed.

In addition, despite such a partial energization method, since the energizing tip pieces 4 are strongly pressed against each other, local wear such as one-sided wear is inevitable in the case of Fig. 1, even if it is not everywhere. difficult,
After long-term use, the energization state could become uneven.

The present invention was developed in view of these circumstances, and aims to establish an energization method that is less likely to cause local abrasion of the energizing tip piece and that does not cause an accident of cutting the strip electrode.

The inventors of the present invention have proposed that if electricity is distributed to the strip electrodes in a distributed manner by using a current-carrying device as described below,
The present invention was completed after realizing that the above objects are conveniently distantly related.

That is, the gist of the configuration of the current-carrying device according to the present invention is that the current-carrying tips that are press-contacted from both sides of the strip electrode are arranged so as to deviate from the positions facing each other and occupy alternate positions.

Therefore, the flow of current is not concentrated, and cutting of the strip electrode is prevented, and since the clamping force originally acts in an oblique direction, even if local wear occurs, uneven current flow will not develop.

The configuration and effects of the present invention will be described below based on drawings showing embodiments, but as with the embodiments described in the claims for utility model registration, the following description is not intended to limit the present invention.

Therefore, all changes and implementations in accordance with the above and below intentions are included in the present invention.

FIG. 3 is a sectional view showing a basic embodiment that satisfies the above-mentioned structural requirements.
a, 40, and 4d are arranged, and two current-carrying chip pieces 4b and 4e are arranged on the other side.

That is, in the present invention, it is not necessary that the number of current-carrying chips disposed opposite to each other is the same, and as will be seen in the embodiments described later, it is often the case that the number of current-carrying chips is different.

What is more important in the present invention is the positional relationship between the current-carrying chip pieces 4a, 4c, and 4d and the current-carrying chip pieces 4b and 4e, which are arranged in a □-like pattern in which they occupy staggered positions away from facing each other.

With this arrangement, the direction of the current is more diffuse than in the case of FIG. 2, and the cutting accident described above will not occur.

Furthermore, since the current-carrying tip pieces are not pushed together from the front as shown in FIG. 2, but the pushing force tends to be dispersed, local wear is less likely to occur.

Even if local wear such as one-sided wear occurs, since the way in which force is applied is originally dispersive, it will easily adapt and will not cause poor or uneven current flow.

In this example, the positions of the current-carrying tip pieces 4a...4e are line symmetrical (left-right symmetrical in the figure) with respect to the longitudinal center vertical line X of the strip electrode 1. A symmetrical relationship such as
The figure shows an example of these relationships.

On the other hand, in Fig. 4, one current-carrying tip piece (4a and 4b) is provided on both sides of the strip electrode 1, and the width is slightly wider to prevent the current density from becoming excessive. Chip pieces are used.

Moreover, this example is not an example of line symmetry, but a point symmetrical position with respect to the center point P of the cross section of the strip electrode 1, and FIG. 8, which will be described later, also shows an example of point symmetry.

The modification shown in FIG. 5 includes chip pieces 4a and 4b.

In this example, 4C is considered as one pair, chip pieces 4d, 4e, and 4f are considered as one pair, and chip pieces 4g, 4h, and 4i are considered as one pair.
The tip pieces of each pair are staggered to meet the requirements of the present invention.

Also, Figure 6 is a modification of the example in Figure 5, with the central pair 4d, 4e,
4f are replaced respectively.

The idea of "pairs" in these examples is to place one item with a width approximately equal to the sum of the two items with smaller widths, but in the examples in Figures 7 and 8, two items with the same width are arranged. The chip pieces form a "pair".

Figure 9 shows an example in which the current-carrying chip pieces 4a...4g are arranged randomly, taking into consideration only the essential requirement of alternating them, abandoning the idea of ``one symmetry''. This satisfies the present invention.

The above shows the basic embodiment of the present invention, and the holding member 5
, 5', a clamping method using a pressing spring, etc. can be designed and implemented as desired.

By the way, Figures 10 and 11 are cross-sectional views of the main parts showing the holding method, and Figure 10 shows an example in which the screw 4' is screwed into the holding member 5 for attachment to the chip piece 4. A simple protruding rod may be fitted and held.

Further, FIG. 11 shows an example in which the root portion of the chip piece 4 is screwed into a screw punch 5a formed protrudingly from the holding member 5 using a butt cap nut 6.

Although the chip piece 4 is shown to have a circular cross-section in FIG. 10.11, it goes without saying that there is no limit to the cross-sectional shape.

Since the present invention is constructed as described above, it is possible to ensure uniform energization over a long period of time without damaging the strip electrode.

This uniform energization can be maintained even when local wear occurs on the energizing tip piece, and is extremely significant from the viewpoints of welding stability and economical efficiency.

[Brief explanation of drawings]

Figures 1 and 2 are sectional views showing the conventional energization method, Figures 3 to 9 are sectional views showing the embodiment of the present invention, and Figures 10 and 11 are sectional views of essential parts showing an example of how the energizing chip is attached. It is. 1... Band-shaped electrode, 4... Current-carrying chip piece.

Claims (4)

[Scope of utility model registration request] (1) An energizing device for a welding strip electrode, characterized in that the energizing tip pieces facing each other with the welding strip electrode sandwiched therebetween are arranged so as to deviate from the positions facing each other and occupy alternate positions. (2) Utility Model Registration Claim 1: The energizing device according to claim 1, wherein there are a plurality of energizing tip pieces provided on both sides of the welding strip electrode. (3) In paragraph 1 or 2 of claims for utility model registration,
An energizing device in which the positions of the energizing tip pieces provided on both sides of a welding strip electrode are symmetrical with respect to the longitudinal center vertical line of the strip electrode. (4) In paragraph 1 or 2 of claims for utility model registration,
An energizing device in which the positions of energizing tips provided on both sides of a welding strip electrode are symmetrical with respect to the center point of the transverse cross section of the strip electrode.