JPS6235591Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electrode device for a spot welding machine, and in particular an electrode adapter that can be detachably attached to an electrode holder, and a stepped electrode that can be inserted into the adapter and replaced at will. The present invention relates to a structure of an insert electrode device comprising a chip.

FIGS. 1, 2, and 3 show the technological progress of conventional electrodes.

The electrode device shown in FIG. 1 is fixed by providing a bolt hole 2 in an electrode block 1, inserting a tightening bolt (not shown) into the bolt hole, and screwing it into an electrode holder 3. be.

However, since the contact area with the workpiece is large, it is not possible to concentrate the current when energizing, and
Replacing the electrodes after use is uneconomical since it is necessary to replace each electrode block.

Next, in the electrode device shown in FIG. 2, the threaded portion 4a of the stepped electrode chip 4 is connected to a detachable electrode adapter
The electrode tip 4 is completely screwed into the electrode tip hole 6 until the stepped portion 4b abuts against the upper surface of the electrode adapter 5. This electrode is more economical than the one shown in FIG. 1 because only the stepped electrode chip 4 needs to be replaced as a consumable item.

However, when using an offset (eccentric) electrode as described below, the tip of the electrode tip at the fully tightened position is unstable and does not necessarily match the dot position on the workpiece. , which is a practical problem.

The electrode device shown in the following Figure 3 has an electrode adapter 5.
The tapered part 4c of the stepped electrode chip 4 is simply inserted into the tapered hole 7 provided in the tapered hole, and a vertical groove 8 is formed in a part of this tapered hole. Therefore, even if there is some variation in the machining accuracy of the taper, the stepped electrode chip 4 can be completely inserted up to its stepped portion 4b, and the upper surface of the electrode adapter 5 and the stepped portion 4b of the electrode chip can be brought into close contact. This makes it easy to align the tip of the offset electrode tip.

However, this taper-fitting electrode
After replacing the electrode tip several times, the tip hole in the electrode adapter gradually becomes loose, and when the electrode tip adheres to the workpiece during welding, it may fall out, often causing work to be interrupted. , multi-spot lines, etc., may cause an emergency situation such as stopping the operating line.

Note that the reason why stepped electrode tips are used in all of these examples is that they are intended for applications where the height of the tip end surface of the electrode tips is strictly regulated.

Unlike the electrodes described above, the present invention achieves all of the above-mentioned problems at once by applying a clamping force to tightly tighten the stepped electrode tip in the direction of closing the tip hole of the electrode adapter. To provide a novel insert electrode device that solves the drawbacks.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 4 is an exploded view of the parts of the electrode of the present invention, and FIG. 5 is a perspective view of the electrode after being assembled.

FIG. 6 shows the right side of FIG. 5, and FIG. 7 is an explanatory diagram of the electrode adapter and clamper.

The insert electrode device 10 of the present invention includes an electrode adapter 11, a stepped electrode tip 12, a clamper 13,
It consists of a tightening bolt 19. The front part A of the electrode adapter 11 has a straight tip hole 11a into which a stepped electrode tip 12 is inserted. Further, a bolt hole 11b into which a tightening bolt 19 is inserted is provided in the rear part B of the adapter. The bolt hole 11
The rear part B of the electrode adapter 11, which also includes the tip hole 11a, is normally one level lower than the height of the front part A, which includes the tip hole 11a, and on both sides of the lowered part, there is a trapezoidal cross section as shown in FIG. slanted walls 14, 14'
is formed.

In addition, there is a bolt hole 11 in the rear part B of the electrode adapter.
A slotted groove 17 is provided that passes through the center of the tip hole 11a and reaches the center of the tip hole 11a.

The clamper 13 has a U-shaped cross section and presses down both sides of the rear part of the electrode adapter to open the tip hole 11.
A clamping force is applied in the direction of closing a. There are bolt holes 1 on the upper wall of this clamper 13.
3b is provided, and this bolt hole 13b is located where it overlaps with the bolt hole 11b of the electrode adapter 11. Inside the clamper 13, inclined walls 15, 15' are provided that face the inclined walls 14, 14' of the electrode adapter 11.

On the other hand, the stem of the stepped electrode tip 12 into which the electrode adapter is inserted is straight, and its diameter is slightly smaller than the tip hole. Note that the stepped electrode chip shown in the drawings of this embodiment is an offset type electrode chip.

With the above configuration, when the insert electrode device 10 according to the present invention is attached to a predetermined position of the electrode holder 18, the stepped electrode tip 12 is inserted into the tip hole 11a of the electrode adapter 11, and the clamper 13 is inserted into the rear part B of the electrode adapter 11. , and insert the tightening bolt 19 from above the clamper 13 into the bolt hole 13.
a, 11b and tighten it, the inclined walls 15, 15' on the inside of the clamper 13 engage with the inclined walls 14, 14' of the electrode adapter 11 and press it from both sides, making the slot groove 17 smaller. However, since a clamping force acts in the direction of closing the tip hole 11a, the insertion portion 12c of the stepped electrode tip 12 inserted into the tip hole 11a is firmly tightened.
Therefore, even with an offset type tip as shown in the figure, the tip portion can be easily aligned, and the stepped portion 12b and insertion portion 12c can be tightly fixed to the electrode adapter 11. Furthermore, when replacing the electrode tip after use, simply loosening the tightening bolt 19 and releasing the clamper 13 allows the electrode tip to be easily inserted and removed.

As is clear from the above explanation, according to the present invention, the stepped electrode tip inserted into the electrode adapter is positively clamped using a tightening bolt for fixing the electrode adapter, so that offset can be achieved. Even if the electrode tip is used, the tip position will not go out of order, and the electrode tip will no longer fall off under any circumstances. Moreover, the tip can be easily replaced after use by simply loosening the tightening bolt, and consumable parts are also easy to process, making it economical.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams showing the evolution of the structure of a conventional electrode device for spot welding machines, Figure 4 is an exploded view of the parts of the insert electrode device according to the present invention, and Figure 5 is the electrode device of the present invention. A perspective view of. Figure 6 is a right side view of Figure 5, and Figure 7 specifically shows the structure of the electrode adapter and clamper of the present invention, where A is a plan view, B is a front view, and C is a right side view. . Explanation of symbols, 10...Insert electrode device, 1
1b... Bolt hole, 11... Electrode adapter, 13
... Clamper, 11a ... Chip hole, 19 ... Tightening bolt, 12 ... Stepped electrode chip, 17 ... Slotted groove, 14, 14' ... Inclined wall.

Claims (1)

[Scope of utility model registration request] The front part of the electrode adapter has a straight tip hole for inserting a stepped electrode tip, and the rear part has a bolt hole for inserting a tightening bolt, and the rear part has an inclined wall with a trapezoidal cross section. Moreover, the rear part has a slotted groove that passes through the center of the bolt hole and reaches the center of the tip hole, and when the tightening bolt is tightened, the slotted groove moves in the direction in which the tip hole closes. An insert electrode device comprising a clamp means installed at the rear of the electrode adapter to press the inclined wall of the electrode adapter so as to make the electrode adapter smaller.