JPH0340463Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to an improvement of a lower type flash butt welding device, and is particularly characterized by the mounting structure of the upper electrode portion.

Prior art A welding transformer is mounted on the upper part of the equipment main body, the upper electrode attached to the tip of the clamp arm is used as a current conductor, and the object to be welded is latched and held on the lower electrode side, and the butt ends of the object are connected. A flash butt welding device that performs resistance welding by applying a large current while applying pressure is already known as a so-called underhang type flash butt welding device.

This kind of flash butt welding equipment has a clamp arm and a clamp stand that are separated into left and right sides, and a pair of replacement parts is installed on the tip side of the pair of clamp arms and on the upper end side of the clamp stand. If possible, the lower electrode is attached via a wedge-shaped conductor and wedge for level adjustment.

However, with this type of structure, the wedge-shaped conductor is simply inserted into the insertion groove above the upper electrode so that the insertion position can be adjusted, so the upper electrode wears out. When replacing it, the wedge-shaped conductor also falls off at the same time, and when installing the replaced upper electrode, the wedge-shaped conductor must be reinserted into the insertion groove from the beginning to adjust the level, which is a hassle. It was something that required

Purpose of the invention This invention was created in view of the above circumstances, and is a flash butt welding device that reduces the effort required to replace the upper electrode and also allows the upper electrode to be installed in an appropriate condition. The purpose is to provide

Embodiment Hereinafter, one embodiment will be described in detail with reference to the accompanying drawings.

FIG. 1 is a partially cutaway sectional view of a flash butt welding device to which this invention is applied.

In this figure, a welding device main body 1 has a pair of left and right clamp arms 2, 2 and a clamp stand 3, 3 that constitute an upper and a lower part, respectively, and each clamp arm 2, 2 is connected to a hydraulic cylinder during welding. The mechanism 4 is rotatably connected to the clamp tables 3, 3 by shafts 5, 5 in order to pressurize the welded portion of the workpiece. One of the clamp tables 3, 3 is slid on a guide rail 7 by a driving means including a pressure cylinder 6, and can advance and retreat toward and away from the other clamp table 3. An upper electrode 8 is provided on the tip side of the clamp arms 2, 2.
8, and lower electrodes 9, 9 are attached to the upper end sides of the clamp stands 3, 3 at positions opposite to the upper electrodes 8, 8, respectively, by inserting a wedge-shaped conductor 10 and a wedge 10'.

Further, welding transformers 11, 11 having the same characteristics are mounted above each of the clamp arms 2, 2, and in order to supply welding current from these welding transformers 11, 11 to the upper electrodes 8, 8, the transformer 1
Both the left terminal 12 and the right terminal 13 provided below the clamp arms 2 and 11 are connected to a pair of support conductors 15 attached to the adjacent sides of each clamp arm 2 and 2 via flexible conductors 14 and 14, respectively. , 15.

As shown in FIG. 3, the upper electrode 8 includes a replacement electrode body 81 that is replaced when it wears out, and this replacement electrode body 8.
1 and an electrode stand 82 provided for stably fixing the support conductor 15 to the lower side of the support conductor 15. The structure is a columnar composite structure elongated in the depth direction, and both of these 81 and 82 are replacement electrode bodies. The connecting bolts 16 are screwed in from above and below so that the engaging protrusions 81a of 81 are engaged with the engaging recesses 82a of the electrode stand 82, and the electrode stands 82 and 82 are connected together.
In order to prevent heating during welding, a cooling pipe 82b is provided inside along the longitudinal direction.

Such an upper electrode 8 can be attached to the clamp arm 2 by screwing a plurality of fixing bolts 17 into the electrode stand 82 from the side of the distal end of the clamp arm 2.
The support conductor 15 is provided in an insertion groove 23 that is open downward and on one side at the bottom of the support conductor 15 and extends to the tip of the support conductor 15 .

However, the upper electrode 8 is not limited to a composite structure as shown in the illustrated example, and the replacement electrode body 81 and the electrode stand 82 may be integrally formed.

The other lower electrode 9 is disposed on the upper end side of the clamp base 3 at a position facing the upper electrode 8 with a wedge 10' inserted therebelow.

The wedge-shaped conductor 10 is a tapered columnar body. Further, as shown in FIG. 4, engagement protrusions 10a that protrude upward and engagement protrusions 10b that protrude sideways are formed in the longitudinal direction of the top surface and the longitudinal direction of the side surfaces of the wedge-shaped conductor 10. . Moreover, the wedge-shaped conductor 10 is
A mounting bracket 19 is attached to the rear end surface 10c with bolts 18, and these engaging protrusions 10a, 1
0b into the engagement grooves 15a and 15b formed in the longitudinal direction of the upper surface and the longitudinal direction of the side surface of the support conductor 15, and further screw the adjustment bolt 22 into the support conductor 15 via the mounting bracket 19. Therefore, it is inserted above the upper electrode 8 in the insertion groove 23 of the support conductor 15 . The insertion position of the wedge-shaped conductor 10 is adjusted according to the screwing position of the adjustment bolt 22.

According to such a configuration, even when the upper electrode 8 is removed, the wedge-shaped conductor 10 remains connected to the upper electrode 8.
Since it is hung above the upper electrode 8, when replacing the upper electrode 8, it is only necessary to hold the upper electrode 8, and the replacement work of the upper electrode 8 can be performed extremely easily.

Note that the wedge-shaped conductor, as shown in Figure 8,
It has a shape in which an engagement protrusion 10e is formed in the longitudinal direction of the top surface and an engagement groove 10d is formed in the longitudinal direction of the side surface, and these engagement protrusions 10e are formed on the support conductor 15 side.
and forming an engagement portion corresponding to the engagement groove 10d,
The support conductor 15 may be latched onto the support conductor 15, and engaging protrusions may be formed in the longitudinal direction of the top surface and the longitudinal direction of the side surface of the wedge-shaped conductor, and the longitudinal direction of the top surface of the insertion groove of the support conductor and the longitudinal direction of the insertion groove of the support conductor. Engagement grooves may be formed in the longitudinal direction of the side surfaces.

Moreover, when the upper electrode is formed into a wedge shape with a horizontal working surface formed on the lower side, such a wedge-shaped conductor forms an engaging protrusion, contrary to FIGS. 4 and 8. The upper part may be formed as a horizontal surface, and the lower part may be formed with a tapered slope, and the level may be adjusted by bringing the slopes of both sides into contact with each other.

The holder 20 for holding the upper electrode 8 is made of metal or the like with high rigidity, and the lower end surface of the supporting conductor 15 extends to the lower side of the tip of the clamp arm 2, that is, the lower side of the clamp arm 2. It is attached to.

As shown in detail in the longitudinal section of FIG. 5, this holder 20 is formed into a plate-like body in which receiving parts 20b, 20b are formed at both ends of a flat main body 20a to curve upwardly. Then, the fixing bolt 21 is loosely inserted into the hollow hole 20c drilled in the center of the flat plate body through the spherical washer 24 with a tapered 24a formed on the periphery, and the retaining parts 20b, 20b on both sides are inserted. A part of the upper electrode 8 and a clamp arm 2, respectively.
The fixing bolt 21 is screwed into the lower side of the tip of the clamp arm 2 so as to come into contact with the lower side of the tip of the clamp arm 2.

According to such a holder 20, the fixing bolt 2
When replacing the upper electrode 8 by loosening the upper electrode 1, the holder 20 temporarily holds the upper electrode from below, so that the upper electrode 8 will not fall accidentally.
Therefore, there is no need to hold each upper electrode by hand, which greatly facilitates replacement work.

Further, after the upper electrode 8 is fixed with the fixing bolt 21, the holder 20 acts like a lever, and the receiving part 20b, which curves and protrudes upward, constantly contacts and pushes the upper electrode 8 from below. Since the pressure is applied, there is an advantage that the upper electrode 8 is always kept in close contact with the support conductor 15 without creating a gap and is maintained in an appropriate state.

FIGS. 6 and 7 show other examples of the holder.

That is, the one shown in Fig. 6 has protruding receiving parts 20b formed at the four corners of the flat plate body to receive part of the upper electrode, and the one shown in Fig. 7 has the receiving parts 20b semispherical. In each case, a fixing bolt (not shown) is inserted into a hole 20c drilled at an appropriate interval in the center of each main body 20a, 20a, and attached to the bottom of the tip of the clamp arm 2. It is becoming fixed.

It goes without saying that the holder can be implemented in various ways other than these examples, and it can be fixed to the bottom of the tip of the clamp arm and temporarily held from the bottom when replacing the upper electrode. However, any material may be used as long as it can receive and hold the upper electrode when it is attached.

Effects According to this invention, the upper electrode installed on the tip side of the clamp arm is inserted into the insertion groove that is open downward and on one side and is formed at the bottom of the support conductor. In a flat butt welding device in which a wedge-shaped columnar conductor for level adjustment is interposed between the upper surface of the insertion groove and the upper surface of the upper electrode, the holder for holding the upper electrode from below is attached to the above. An engaging protrusion is provided on one side of the wedge-shaped conductor for level adjustment, which is installed at the bottom of the tip of the clamp arm, and that faces each other in the longitudinal direction of the upper surface of the wedge-shaped conductor and the longitudinal direction of the upper surface of the insertion groove of the support conductor. In addition to forming an engagement groove that engages with the engagement protrusion, engagement protrusions are also formed on one side of the wedge-shaped conductor for level adjustment facing each other in the longitudinal direction of the side surface and the insertion groove of the support conductor in the longitudinal direction of the side surface. Since an engagement groove is formed on the other side of the strip to engage with the engagement protrusion, even if the wedge-shaped conductor is not supported by hand when replacing the upper electrode, the wedge-shaped conductor can be attached to the supporting conductor without falling. This makes work extremely easy. Further, for the same reason, later level adjustment becomes easier.

In addition, since the upper electrode is held from below by the holder, it will not fall or shift even if you do not have to hold it by hand every time you replace it and until you install a new upper electrode. Replacement of the upper electrode becomes extremely easy.

Moreover, since the upper electrode is clamped between the wedge-shaped conductor and the holder after mounting, there is no risk of creating a gap between the upper electrode and the clamp arm, and therefore there is no problem such as electrolytic corrosion.

[Brief explanation of the drawing]

Fig. 1 is a cutaway front view of essential parts showing the overall configuration of the devised device, Fig. 2 is a side view of the devised device shown in Fig. 1, and Fig. 3 is the attachment of the upper electrode of the devised device. FIG. 4 is a partial perspective view showing the structure of the upper electrode mounting portion, FIG. 5 is a vertical side view of the holder, and FIGS. 6 and 7 are the holder. FIG. 8 is a perspective view showing another example of the wedge-shaped conductor. Explanation of symbols, 2... Clamp arm, 8... Upper electrode, 10... Wedge-shaped conductor, 10a, 10
b, 10e...Engaging protrusion, 10d, 15a, 15
b... Engagement groove, 20... Holder.

Claims (1)

[Claims for Utility Model Registration] The upper electrode 8 installed on the tip side of the clamp arm 2 is inserted into the insertion groove 23 that is open downward and on one side and is formed in the lower part of the support conductor 15. In a flash butt welding device in which a wedge-shaped conductor 10 in a columnar shape for level adjustment is interposed between the upper surface of the insertion groove 23 of 15 and the upper surface of the upper electrode 8, the upper electrode 8 is inserted from below. Holder 20 to hold
is installed on the lower side of the tip of the clamp arm 2, and the longitudinal direction of the upper surface of the wedge-shaped conductor 10 for level adjustment facing each other and the insertion groove 23 of the support conductor 15.
In the longitudinal direction of the top surface, one of the engagement protrusions 1
0a is formed on the other side with an engagement groove 15a that engages with the engagement protrusion 10a, and the side surface longitudinal direction of the wedge-shaped conductor 10 for level adjustment and the side surface longitudinal direction of the insertion groove 23 of the support conductor 15 facing each other. Also in the direction, the engagement protrusion 10b on one side and the engagement protrusion 1 on the other side.
A flash butt welding device characterized in that an engagement groove 15b that engages with the welding groove 15b is formed.