JP2583931Y2 - Cooling system for spot welding gun - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a so-called transformer-equipped gun in which a welding transformer is integrated with an X gun or a C gun. By attaching a water-cooled manifold to the transformer secondary terminal, the welding gun and the welding transformer are connected. And a cooling water piping route formed between the side.

[0002]

2. Description of the Related Art Conventionally, a cooling water pipe for cooling a transformer and a gun in a gun with a transformer is piped to each arm in series from a water-cooled manifold disposed on the side of the transformer by a hose. I was

[0003]

However, in such a cooling water piping, the piping of the cooling water becomes complicated, and there is a problem that the overhang of the piping and the water cooling manifold to the side of the gun occurs.

In order to avoid such a problem, the use of a water-cooled manifold has been abolished (Japanese Utility Model Application Laid- Open No. 4-98).
In the cooling water pipe described in Japanese Patent Application Publication No. 376 , for example, when detecting the electrode chip detachment by the flow switch when the electrode tips of the upper and lower gun arms are welded, the cooling water circuit is divided into two circuits or three circuits. If they are not independent, this detector cannot be mounted on the OUT side of each independent circuit. In other words, as in the past, the cooling water
Even if a water leak can be detected on the OUT side of the pipe,
In some cases, you may not know whether a water leak has occurred.
Could not be treated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. The specific technical means are two gun arms (2) and two gun arms (2) pivotally supported on a gun bracket (5) so as to be able to move about a common hinge pin (4).
A pair of electrodes (6) and (7) facing each other is fitted to the tip of the gun arm (3) , and a pressing device (8) is provided behind the gun arm. An X gun connected to pressurize both electrodes, a welding transformer (10) integrated with the X gun, and a pair of positive and negative bus bars (11a) connected to the secondary terminal of the transformer; And buss
A bar (11b) , a pair of positive and negative busbars (12a) and (12b) connected to the gun arm side,
A shunt (13) connecting the pair of positive and negative busbars
a) and X with a transformer having a shunt (13b)
In a gun, two gun arms (2) and a gun arm
(3) IN and OUT reciprocating cooling water passages are provided respectively, and cooling water passages are also provided on busbars respectively connected to the secondary terminal side and the gun arm side, and IN and OUT are provided on the secondary terminal side. OUT water cooling Maniho - attaching the shield (14) and water cooling manifold (15), one Maniho - field (1
From 4), through the bus bar (11a) on the secondary terminal side, one gun arm (2) and the other bus bar on the gun arm side.
(12b) to IN and the other water-cooled manifold
From (15), the busbar (12
From a) to the bus bar (11b) on the secondary terminal side and the other
From the gun arm (3) of the secondary terminal side to the bus bar (11).
b) A cooling path is arranged for each OUT .

[0006]

According to the cooling device of the present invention, by mounting the water-cooled manifold on the secondary terminal side, the screwing surface of the manifold on the secondary terminal side can be adjusted in the direction of the external piping. Is easy. In addition, since the existing dedicated cooling path can be changed to a plurality of independent cooling paths according to the intended use , a flow switch is provided on the OUT side of each cooling water path.
Can be attached, and water leakage can be easily detected.

[0007]

FIG. 1 is a plan view showing an embodiment in which the present invention is applied to a robot X gun, and is a plan view of the entire welding gun. FIG.
Is a side view of the same.

[0008] X gun 1 has a gun arm 2 and a gun arm 3
Are supported by a gun bracket 5 so as to be able to move about a common spindle 4. An electrode 6 and an electrode 7 are supported at the tip of each gun arm. The stroke of the electrodes 6 and 7 is applied to a pressurizing device 8 connected to the rear of the gun arm.
It opens and closes with the movement of.

The welding transformer 10 is supported by bolts on a transformer support 9 fixed laterally to the gun bracket 5.

A secondary circuit formed between the X gun 1 and the welding transformer 10 includes a pair of positive and negative bus bars 11a and 11b connected to secondary terminals a and b on the transformer side.
A substantially U-shaped flexible shunt 13a and 13b is connected to a pair of positive and negative busbars 12a and 12b connected to each gun arm side of the X gun.

As shown in FIG. 2, the bus bar 11a and the bus bar 11b on the transformer side are composed of an upper bus bar 11a and a lower bus bar 11b, which are vertically symmetrical assembly parts. It is assembled with.
One end of each bus bar is connected to a secondary terminal a or secondary terminal b on the transformer side, and the other end is a shunt 13a.
Alternatively, they are mounted on the shunt 13b side by bolting.

A water passage for circulating cooling water is formed inside each bus bar, and a water cooling manifold 14 and a water cooling manifold 15 for IN and OUT are respectively provided in the water passages for the bus bar 11a and the bus bar 11b. Mounted.

The two gun arms have IN and OU, respectively.
A reciprocating cooling water passage of T is formed, and a bus bar 12a and a bus bar-1 connected to the secondary terminal side and the gun arm side.
2b is also provided with a cooling water passage.

On the secondary terminal side, one of the water-cooled manifolds 14 respectively attached to IN and OUT is connected to the IN side of one of the gun arms 2 via the bus bar 11a on the secondary terminal side. The other is connected to the IN side of the bus bar 12b of the other gun arm 3.

The cooling path from the other manifold 15 to the OUT side of the other gun arm 3 and the OUT side of the bus bar 12a of the other gun arm 2 via the bus bar 11b on the secondary terminal side. It is plumbed.

FIG . 3 shows the structure of the water-cooled manifold 31 and the water-cooled manifold 32. FIG. 4 is a side view thereof. As can be seen from this figure, the main body has a screw portion 33 protruding from one side surface, and has a plurality of branch holes P communicating with the screw portion inner diameter. The water-cooled manifold may be generally made of metal or synthetic resin.

[0017]

[Effects of the Invention] As described in detail above, according to the cooling device of the present invention, by mounting the water-cooled manifold on the secondary terminal side, the screwed surface of the water-cooled manifold to the secondary terminal can be externally mounted. It can be adjusted to the piping direction, and can be replaced with a water-cooled manifold according to the external piping diameter, so the piping work becomes easy.

Further, since it changes the cooling water path dedicated to a plurality of independent cooling water passage according to the purpose, a plurality of cooling
A water leak detector can be placed in each water path, and
Quick response to water leaks due to dropouts or breakage of other cooling water piping.
Can respond quickly.

[Brief description of the drawings]

FIG. 1 is a plan view of an entire welding gun in an embodiment in which the present invention is applied to a robot X gun.

FIG. 2 is a side view of a gun with an X gun transformer for a robot embodying the present invention.

FIG. 3 is a sectional view showing an embodiment of the water-cooled manifold of the present invention.

FIG. 4 is a side view of the water-cooled manifold of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 X gun 2 Gun arm 3 Gun arm 4 Hinge pin 5 Gun bracket 6 Electrode 7 Electrode 8 Pressurizing device 9 Transformer support 10 Welding transformer 11a Trans-side bus bar 11b Trans-side bus bar 12a Gun bus side 12b Busbar on gun arm side 13a Shunt 13b Shunt 14 Water-cooled manifold 15 Water-cooled manifold

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B23K 11/36 B23K 11/11

Claims (1)

(57) [Scope of request for utility model registration] A gun arm (2) and a gun arm (3) pivotally supported by a gun bracket (5) so as to be movable about a common hinge pin (4). Pair of electrodes (6) and electrodes facing each other at the tip of the system
(7) is fitted, and a pressurizing device is provided behind the gun arm.
An X gun that performs a pressurizing operation between both electrodes by connecting (8)
Welding transformer integrated with this X gun (10)
A pair of positive and negative bus bars (11a) and (11b) connected to the secondary terminal of the transformer, and a pair of positive and negative bus bars (12a) and (12a) connected to the gun arm side.
And a busbar (12b) and a shunt (13a) and a shunt (13b) connecting the pair of positive and negative busbars, two gun arms (2) and (3). In addition, a reciprocating cooling water passage for IN and OUT is provided respectively, and a cooling water passage is also provided for a bus bar connected to the secondary terminal side and the gun arm side, respectively. Manifold (14) and water-cooled manifold (1
5) , and one gun arm from one manifold (14) via the busbar (11a) on the secondary terminal side.
(2) and the other gun arm side busbar (12b) to IN and from the other water-cooled manifold (15) to
From the busbar (12a) on one gun arm side to the secondary terminal
To the side busbar (11b) and to the other gun arm
From (3) to OUT of busbar (11b) on the secondary terminal side
A cooling device for spot welding guns, each with a cooling path .