JPH0819874A - Spot welding use auxiliary gun device - Google Patents

Abstract

PURPOSE:To provide a spot welding use auxiliary gun device which can effectively use the energizing function and the pressurizing function of a welding gun of a spot welding robot. CONSTITUTION:A pair of gun arms 16 are pivotally supported on a body frame 10 through a pivot supporting mechanism 30 freely openably and closably, a cylinder 42 to drive these gun arms 16 to a welding position is provided, spot welding electrodes 17 are attached on top ends of both gun arms 16, a pair of pressurizing and energizing parts 19 are provided on middle parts of both gun arms 16, and the spot welding is executed with a pair of electrodes 17 by pressurizing and energizing a pair of pressurizing and energizing parts 19 with the welding guns of the welding robot.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spot welding auxiliary gun device for performing spot welding in cooperation with a welding gun of a welding robot for spot welding.

[0002]

2. Description of the Related Art Conventionally, in automobile manufacturing factories and other various manufacturing factories, work is conveyed on pallets while
Spot welding is often performed on each part of the workpiece by a spot welding gun attached to the hand part of the welding robot.
When there is a part that cannot be welded due to the hand posture and space of the welding robot, it is often the case that the welding robot at the next station welds it, or the welding gun of the hand is exchanged for welding. .

On the other hand, in order to weld a portion that cannot be welded by a welding robot, a dedicated automated spot welding device may be provided on a pallet or a pallet transport path.
This spot welding apparatus is provided with at least a pair of spot welding electrodes so as to face each other at the tip end portions of a pair of gun arms, and these spot welding electrodes can be energized from a welding power supply device. An air cylinder for driving the pair of gun arms to the welding position is provided, and at the time of welding, spot welding is performed by driving the pair of gun arms to the welding position and energizing the spot welding electrodes.

[0004]

The spot welding device for exclusive use is the same as the spot welding gun of the welding robot.
It is installed independently and configured to supply power from its own welding power source device, and because it is configured not to be controlled by the control unit of the welding robot but to be controlled by another control device. It is very disadvantageous in terms of cost and installation space. An object of the present invention is to provide an auxiliary gun device for spot welding which can effectively utilize the energizing function and pressurizing function of the spot welding gun of the welding robot for spot welding.

[0005]

An auxiliary gun device for spot welding according to claim 1 is an auxiliary gun device for spot welding for performing spot welding in cooperation with a welding gun of a welding robot for spot welding. And the body frame,
Spot welding electrodes are provided at the tips facing each other 1
A pair of gun arms and a welding position in which the pair of gun arms are close to each other with electrodes for spot welding separated from each other;
A pressure is applied from the welding gun of the welding robot to the pivotal support mechanism that pivotally supports the main body frame so as to be openable and closable over the non-welding position where the spot welding electrodes are separated from each other, and the pair of gun arms. In addition, in order to energize, a pair of pressurizing / energizing portions formed on a pair of gun arms is provided.

[0006] Here, driving means for pressurizing and driving the pair of gun arms to a welding position may be provided (claim 2 dependent on claim 1). In addition, a spring member that elastically biases the pair of gun arms to a non-welding position may be provided (claim 3 dependent on claim 1). In addition, the pair of gun arms may be formed in a straight shape in a side view (claim 4 dependent on claim 2 or claim 3). The above 1
The pair of gun arms may be formed in an L shape in side view (claim 5 dependent on claim 2 or claim 3).

[0007]

According to the auxiliary gun device for spot welding of the first aspect of the present invention, the pair of gun arms have the spot welding electrodes respectively at the tips facing each other, and the pair of gun arms are pivotally supported. Due to the mechanism, both spot welding electrodes are pivotally supported on the main body frame so as to be openable and closable between a welding position where the spot welding electrodes are close to each other across the workpiece and a non-welding position where the spot welding electrodes are separated from each other. The pair of gun arms is provided with a pair of pressurizing / current-carrying portions for applying pressure to the gun arms of the welding robot and energizing the gun arms.

Accordingly, in a state where the pair of gun arms are opened to the non-welding position and the work is set between the spot welding electrodes of the pair of gun arms, the welding robot is applied to the pair of pressurizing / energizing portions. When a pressure is applied from the welding gun and the current is applied, the pair of gun arms are closed to the welding position and are energized, so that the spot welding electrodes of the pair of gun arms can perform spot welding.

Thus, the pressurizing function and the energizing function of the welding gun of the welding robot can be effectively utilized, which is very advantageous in terms of equipment cost and installation space. In addition, the welding gun of the welding robot can reach a part that is distant from the pair of pressurizing / current-carrying parts, so that the welding robot can be used more efficiently. Furthermore, with the body frame,
It has a simple structure consisting mainly of a pair of gun arms, a pair of spot welding electrodes, a pivot support mechanism, and a pair of pressurizing and energizing parts, so it is small, lightweight, easy to handle, and inexpensive to manufacture. it can.

In the spot welding auxiliary gun device according to the present invention, the driving means for pressurizing and driving the pair of gun arms to the welding position is provided. Therefore, at the time of welding, the pressing force of the driving means and the welding robot are used. The required pressure can be generated by the pressure applied by the welding gun. In the auxiliary gun device for spot welding according to claim 3, since a spring member for elastically biasing the pair of gun arms to the non-welding position is provided, after the welding, the pair of gun arms are automatically moved to the non-welding position. Can be switched to each other.

In the spot welding auxiliary gun device of the fourth aspect, the pair of gun arms are formed straight in a side view, but in this case, the structure of the pair of gun arms is simplified. In the spot welding auxiliary gun device according to the fifth aspect of the present invention, the pair of gun arms is formed in an L shape in a side view, but in this case, it is suitable for welding a work having a complicated structure.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the spot welding auxiliary gun device 1 is fixedly mounted on a pallet 9 for setting and transporting a work W in advance, and in this embodiment, is mounted in a vertical orientation, and welding is performed. In order to weld a part which cannot be directly welded by the spot welder 5 of the robot, a predetermined welding point of the work W is set in advance so that it can be welded by the spot welding auxiliary gun device 1, and the work W is set on the pallet. 9 is carried along the pallet carrying line, and spot welding is carried out in cooperation with the spot welding auxiliary gun device 1 and the spot welding machine 5 at a predetermined station.

The spot welding machine 5 is mounted on the hand portion 4 of the articulated robot 2 which is the robot body of the welding robot. The spot welding machine 5 is composed of a spot welding gun 6 and an air cylinder 8 and the like. A pair of electrodes 7 are exchangeably attached to the output tip of the welding gun 6 so as to face each other. The spot welding gun 6 is driven to open and close by an air cylinder 8, and the pair of electrodes 7 pressurize and energize the pressurizing / energizing portion 19 of the spot welding auxiliary gun device 1 to provide an auxiliary gun for spot welding. Device 1
Then, spot welding is performed on the work W. The spot welding gun 6 and the air cylinder 8 of the spot welding machine 5 are connected to the control unit 3 via an energizing cable, a control signal line, a pressurized air supply hose, etc. The drive is controlled by the unit 3.

As shown in FIGS. 2 to 4, the spot welding auxiliary gun device 1 comprises a body frame 10 and a pair of gun arms 15 each having an electrode 17 for spot welding at its tip end facing each other. Therefore, a pair of gun arms 15 having a pair of pressurizing and energizing portions 19 for applying a pressure from the spot welding gun 6 of the spot welding machine 5 and for energizing,
A pair of electrodes 17 for spot welding a pair of gun arms 15
A pivotal support mechanism 30 that pivotally supports the main body frame 10 so as to be openable and closable between a position where the two are close to each other with a work W and a non-welding position where a pair of electrodes 17 for spot welding are separated from each other. ,
The pair of gun arms 15 is composed of an opening / closing drive mechanism 41 for opening / closing the welding position and the non-welding position.

First, the main body frame 10 will be described (see FIGS. 2 to 6). The main body frame 10 is a plate-shaped base plate 11 having a rectangular shape in a plan view, a pivot bracket 12 having a U-shape in a front view, and a plate-shaped support member 13 for fixing the pivot bracket 12 to the base plate 11. It consists of and. The pivot bracket 12 has its upper wall portion 12u and lower wall portion 12w parallel to the base plate 11 and is fixedly supported by the base plate 11 via a support member 13. Upper wall 12u and lower wall 1
A pair of pivot holes 12a are formed in 2w so as to penetrate in a plane orthogonal direction and face each other, and a locking hole 12b is formed in the upper wall 12u.
Is concentric with the pivot hole 12a and has a large diameter.
It is formed at a depth of about 1/3 of the depth of a.
A pivot shaft 31 described later is rotatably attached to the 2a.

Next, the pair of gun arms 15 will be described (see FIGS. 2 and 3). The pair of gun arms 15 are made of a copper alloy having excellent electrical conductivity, and are arranged in parallel to each other and in a state of facing each other. The pair of gun arms 15 are symmetrical to each other. Because it is formed, the gun arm 15 on the left side
The gun arm 15 has an output tip portion 16 having a spot welding electrode 17, and a pressurizing / energizing portion 1.
A wide portion 18 having a base portion 9 and a base end portion 20 fixed to a pivotal support portion described later are provided.

The inner surface of the output tip portion 16 is formed in a taper shape, and the output tip portion 16 has an electrode 17 made of a copper alloy.
Is installed. This electrode 17 has an electrode base portion 17a.
And an electrode tip 17b, and an electrode base 17a
Is fixedly attached to the output tip 16 by fitting, and the electrode tip 17b is replaceably attached to the electrode base 17a. The wide portion 18 is formed with a concave portion 18a whose outer side and upper side are open, and the inner wall portion of the wide portion 18 located inside the concave portion 18a is configured to include a pressure-carrying and energizing member which is detachably mounted. A section 19 is provided.

As shown in FIG. 6, the left gun arm 15
The base end portion 20 of the above is fixed to the first pivotal support portion 33 of the first opening / closing body 32 via the insulating plate 22, and the insulating plate 23 is also provided on the outer surface of the base end portion 20. The base end portion 15 of the fifteen is fixed to the first pivotal support portion 33 by four bolts 24 together with the two insulating plates 22 and 23 and the pressing plate 21. In addition, these bolts 24 are insulated sleeves 25.
Is insulated with. The right gun arm 15 is also fixed to the second pivot portion 37, similarly to the left gun arm 15. The first opening / closing body 32 includes a first pivotally supporting portion 33 and a first cylinder arm 34 integrally formed with the first pivotally supporting portion 33.
The second opening / closing body 36 includes a second pivotally supporting portion 37 and a second cylinder arm 38 formed integrally with the second pivotally supporting portion 37.

Next, the pivotal support mechanism 30 will be described (see FIGS. 2, 3, and 6). The pivot mechanism 30 includes a pair of gun arms 15 at a welding position where both spot welding electrodes 17 are close to each other with a work W, and both spot welding electrodes 17.
Are pivotally supported on the main body frame 10 so as to be openable and closable over a non-welding position where the phases are separated from each other.
The upper wall portion 12u, the lower wall portion 12w, the pivot shaft 31, and the first
The first pivot part 33 of the opening / closing body 32 and the second pivoting part of the second opening / closing body 36
It is composed of a pivot 37 and the like. The first pivotal support portion 33 is U-shaped when viewed from the rear and is formed in a U-shape smaller than the pivotal support bracket 12. A pair of insulating sleeves 35 are fitted in the holes of the upper and lower wall portions of the first pivotal support portion 33. Then, a pair of upper and lower pivot holes 33a are formed, and the inner diameter of the insulating sleeve 35 is formed to be substantially the same as that of the pivot shaft 31.

The second pivot portion 37 is formed in a rectangular parallelepiped shape,
An insulating plate sleeve 39 is fitted in the hole of the second pivotally supporting portion 37 in a plane orthogonal manner to form a pivotally supporting hole 37a.
The inner diameter of the bush 39 is formed to be substantially the same as that of the pivot shaft 31. The first pivot portion 33 is rotatably mounted between the upper wall portion 12u and the lower wall portion 12w of the pivot bracket 12 in an inverted U-shape with respect to the pivot bracket 12, and the second pivot portion 37 is provided.
Is rotatably mounted between the upper and lower wall portions of the first pivot portion 33, and the pivot shaft 31 has a vertical pivot hole 27 (consisting of pivot holes 12a, 33a, 37a). It is inserted and attached. Then, the first pivot portion 33 and the second pivot portion 37
Is rotatably attached to the pivot shaft 31 via insulating sleeves 35 and 39.

The large diameter portion of the upper end of the pivot 31 is the locking hole 12.
The pivot shaft 31 is locked by being fitted in b, and the key plate 40 mounted on the upper surface of the pivot bracket 12 regulates the pivot shaft 31 so as not to move upward. The base end portion 20 of the gun arm 15 on the left side is fixed to the side portion of the first pivotal support portion 33 via an insulating plate 22.
The base end portion 20 of the right gun arm 15 is fixed to the side portion of the pivot portion 37 via an insulating plate 22.

Next, the opening / closing drive mechanism 41 will be described (see FIGS. 2 to 5). The opening / closing drive mechanism 41 is for opening and closing the pair of gun arms 15 between the welding position and the non-welding position, and includes a first opening / closing body 32, a second opening / closing body 36, an air cylinder 42, and It is composed of a piston rod 43 and the like extending from the air cylinder 42. The first cylinder arm 34 of the first opening / closing body 32 is formed in a U shape in a side view, and is integrally formed with the first pivotally supporting portion 33. A pair of first connecting portions 34a are formed on the upper and lower wall portions of the first cylinder arm 34.
And the air cylinder 42 includes a pair of first connecting portions 3
4a is rotatably connected via a pivot piece 44. Inside the air cylinder 42, a spring is installed to urge the piston in the piston rod retracting direction.

The second cylinder arm 38 is formed in the shape of a square rod and is integrally formed with the second pivotal support portion 37. The second cylinder arm 38 is provided with a second connecting portion 38a, and the second connecting portion 38a is formed with a connecting recess. The tip of the piston rod 43 of the air cylinder 42 is mounted in the connecting recess. The joint pin 42b is horizontally rotatably connected to the second connecting portion 38a. Further, in order to adjust the distance between the pair of electrodes 17 at the non-welding position, the first cylinder arm 34 and the second cylinder arm 34 are arranged.
A locking plate 45 for restricting the position of the frame 38 is provided,
The locking plate 45 is fixed to the base plate 11, and the first cylinder arm 34 and the second cylinder arm 38 are
In each non-welded state, a locking bolt 46 that abuts the locking plate 45 is mounted so that its position can be adjusted.

Next, the operation of the spot welding auxiliary gun device 1 will be described. With the work W set between the electrodes 17 of the spot welding auxiliary gun device 1, the spot welding gun 6 of the spot welding machine 5 causes the pressurizing / energizing portion 19 of the spot welding auxiliary gun device 1 to A pressing force is applied in the same manner as in the case of normal spot welding, but the lever length from the pivot 31 to the pressurizing / current-carrying portion 19 is the pivot 3
Since it is about 1/2 of the lever length from 1 to the electrode 17,
About half of the pressure applied to the pressurizing / energizing unit 19 acts on the pair of electrodes 17.

Therefore, the opening / closing drive mechanism 41 is constructed so as to generate an insufficient amount of pressing force, and the air cylinder 4 of the opening / closing drive mechanism 41 is executed at the time of performing the spot welding.
When pressurized air is supplied to 2, the piston rod 43 is driven forward. As a result, the first cylinder arm 34 and the second cylinder arm 34
The cylinder arm 38 horizontally oscillates in the direction of phase separation, and the pair of left and right output tips 16 horizontally oscillate in the direction of phase proximity.
The pressing force acts on the pair of left and right electrodes 17 at the same time.

In this way, due to the pressure applied by the spot welding gun 6 of the spot welding machine 5 and the pressure generated by the opening / closing drive mechanism 41, the pressure required for spot welding (for example, about 250 kg) is generated. At the same time that the work W is pressed between the pair of electrodes 17 by acting on the pair of electrodes 17, the welding current supplied from the spot welding gun 6 of the spot welding machine 5 is applied to one of the pressurizations. Combined energizing portion 19, one output tip portion 16, one electrode 17, work W, the other electrode 17, the other output tip portion 16, the other pressurizing and energizing portion 19
In this order, spot welding of the welding target portion of the work W is performed.

When the spot welding is completed, the spot welding gun 6 of the spot welding machine 5 separates from the pressurizing / energizing portion 19, but at the same time, the pressurized air of the air cylinder 42 is discharged and the inside of the air cylinder 42 is discharged. The piston rod 43 is driven to move back and forth by the spring. as a result,
The first cylinder arm 34 and the second cylinder arm 38 are driven toward each other, and the pair of gun arms 15 are
It is rockingly driven in the phase separation direction and switched to the non-welding position. At this time, the first cylinder arm 34 and the second cylinder arm 34
The rocking position of the cylinder arm 38, that is, the rocking position of the pair of gun arms 15 is determined by the locking plate 45 and the locking bolt 4.
It is regulated by 6.

According to this spot welding auxiliary gun device 1, a pair of pressurizing / cumulating arms 15 are opened in the non-welding position and a work W is set between the electrodes 17 so that a pair of pressurizing / cumulating arms can be used. In parallel with applying and energizing the energizing portion 19 from the spot welding gun 6 of the spot welding machine 5, a pair of gun arms 15 are opened by the opening / closing drive mechanism 41.
Spot welding can be performed by applying a pressing force to. As described above, since the spot welding auxiliary gun device 1 having a simple structure can perform spot welding by effectively utilizing the pressurizing function and the energizing function of the spot welding gun 6 of the spot welding machine 5, the equipment cost and the installation space can be reduced. It is very advantageous in terms of Further, since the opening / closing drive mechanism 41 applies a shortage of pressurizing force to the pair of gun arms 15 so that the desired pressurizing force can be applied, the welding quality can be ensured. In addition, since the spot welding gun 6 of the spot welding machine 5 can reach a portion distant from the pair of pressurizing / current-carrying portions 19 which can be reached, the efficiency of use of the spot welding machine 5 can be improved.

Another Embodiment ... Refer to FIGS. 7 and 8 Next, another embodiment will be briefly described with reference to FIGS. This spot welding auxiliary gun device 1A is formed into a body frame 50 and a straight side view 1
A pair of gun arms 53, a pair of spot welding electrodes 55 mounted on the tip of the pair of gun arms 53, a spring 61 mounted on the pair of gun arms 53, and a pair of The gun arm 53 is provided with a pair of spot welding electrodes 55.
It is composed of a pivot support mechanism 59 and the like that pivotally supports the main body frame 50 so as to be openable and closable between a position where the spot W electrodes are close to each other and a non-welding position where the pair of spot welding electrodes 55 are separated from each other. .

First, the body frame 50 will be described. The main body frame 50 is a base plate 51 having a rectangular shape in plan view.
And a pivot bracket 52 having a front view portal shape. A pivot hole 51a is formed in the base plate 51, and a pivot hole 52a opposed to the pivot hole 51a is formed in the upper wall portion of the pivot bracket 52 so as to extend in a plane orthogonal manner. Support shaft 6
0 is rotatably mounted in the pivot holes 51a and 52a. The gun arm 53 and the body frame 50 are insulated from each other by an insulating member (not shown) as in the case of the front part.

Next, the pair of gun arms 53 and the pivot support mechanism 59 will be described. The pair of gun arms 53 are substantially bilaterally symmetric, formed in a side view straight shape, and made of a copper alloy having excellent electrical conductivity. These gun arms 53 are provided parallel to the base plate 51 so as to face each other. An output tip portion 54 having a spot welding electrode 55 and a pressurizing / energizing portion 58 are provided in each gun arm 53. A base end portion 57 and a pivotal support portion 56 are provided, and an electrode 55 similar to that of the above embodiment is attached to the output tip end portion 54.

The pivotal support portion 56 of the upper gun arm 53 has a structure in which the lower half is removed, and the pivotal support portion 56 of the lower gun arm 53 has a structure in which the upper half is removed. The pair of pivotal support portions 56 are overlapped with each other so as to intersect each other in an X shape in a plan view. These pair of pivots 56
The pivot shaft 60 is inserted through vertical pivot holes formed in the pivot portions 56, which are disposed between the base plate 51 and the pivot bracket 52, and the gun arms 53 are pivoted to each other. The gun arms 53 are rotatably and horizontally pivotally supported via a support shaft 60. These gun arms 53 have a welding position where their electrodes 55 are close to each other across a work W and a non-welding position where the electrodes 55 are separated from each other. It can be opened and closed freely.

The base end portion 57 of the pair of gun arms 53 is provided with a pressurizing / energizing portion 58 composed of an energizing piece, and these energizing pieces are replaceably mounted. Furthermore, the pivot 5
A compression spring 61 for elastically urging the gun arms 53 to a non-welding position is attached to the pair of gun arms 53 approximately in the middle of 6 and the base end portion 57.

According to the auxiliary gun device 1A for spot welding, since the pair of gun arms 53 are formed in the shape of a straight side view, the structure of these gun arms 53 is simplified and the main body frame is formed. 50 is also a simple two-component,
The structure is small and lightweight, and the pivot support mechanism 59 is also a simple structure, which is advantageous in manufacturing cost. Further, since the pressurizing / energizing portion 58 is formed at the base end portions of the pair of gun arms 53, the distance between the electrode 55 and the pressurizing / energizing portion 58 becomes long,
It is suitable for welding a portion that is difficult to weld with the welding gun 6. Moreover, the distance from the pivot shaft 60 to the pressurizing / current-carrying portion 58 is made longer than the distance from the pivot shaft 60 to the electrode 55, and an additional pressing force that is canceled by the urging force of the spring 61 is generated. By doing so, a pressing force equal to the pressing force input from the welding gun 6 can be generated in the electrode 55, so that an air cylinder or the like for generating the pressing force can be omitted, and the structure is simplified, small in size, and lightweight. It is advantageous in terms of conversion.

For example, as shown in FIG. 7, various dimensions a,
b and c are set and the input pressure from the welding gun 6 is F,
When the pressing force required to pressurize the electrode 55 is F and the elastic force of the spring 61 when the gun arm 53 is located at the welding position is S, the following equation is obtained. Fxc-Sxb = F
× a, therefore S = F (c−a) / b. In this way, by setting the elastic force of the spring 61, a pressure equal to the input pressure F can be applied to the electrode 55.

Here, a modified mode in which the spot auxiliary gun device 1A of the another embodiment is partially modified will be described with reference to FIGS. However, the same components are designated by the same reference numerals and the description thereof will be omitted. In this spot auxiliary gun device 1B, a pair of gun arms 53A
Is formed in an L shape in a side view, and an output tip portion 54A that rises parallel to the pivot shaft 60 is integrally formed at a tip portion of each of the gun arms 53A. These output tips 54
A spot welding electrode 55 is attached to the upper end of A. The length of the output tip portion 54A is appropriately set according to the application. This spot auxiliary gun device 1B
It is suitable for welding a hidden part of the work W having a complicated structure.

The spot auxiliary gun device according to the present invention may be used while being mounted on the pallet 9, may be mounted on the work W on the pallet, and may be used on the pallet transport path. It may be provided. Furthermore, depending on the shape and structure of the work W, etc., within the scope not departing from the gist of the present invention,
It is needless to say that the spot auxiliary gun device of the above-described embodiment can be implemented in various modifications.

[Brief description of drawings]

FIG. 1 is a perspective view of an auxiliary gun device for spot welding, a welding robot, and the like according to an embodiment of the present invention.

FIG. 2 is a perspective view of the spot welding auxiliary gun device.

FIG. 3 is a plan view of the spot welding auxiliary gun device.

FIG. 4 is a right side view of the auxiliary gun device for spot welding.

FIG. 5 is a rear view of the auxiliary gun device for spot welding.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a plan view of an auxiliary gun device for spot welding according to another embodiment.

8 is a front view of the spot welding auxiliary gun device of FIG. 8. FIG.

FIG. 9 is a plan view of a spot welding auxiliary gun device according to a modification.

10 is a right side view of the spot welding auxiliary gun device of FIG. 9. FIG.

[Explanation of symbols]

 1,1A, 1B Auxiliary gun device for spot welding 10,50 Body frame 15,53 Gun arm 16,54,54A Output tip 17,55 Electrode 18 Wide part 19,58 Pressurizing / current carrying part 20,57 Base end Part 30,59 Pivot mechanism 31,60 Pivot shaft 32 First opening / closing body 36 Second opening / closing body 41 Opening / closing drive mechanism

Claims (5)

[Claims] 1. A spot welding auxiliary gun device for performing spot welding in cooperation with a welding gun of a welding robot for spot welding, comprising: a main body frame; With electrodes 1
The pair of gun arms and the pair of gun arms can be opened and closed freely between a welding position where both spot welding electrodes are close to each other across a workpiece and a non-welding position where both spot welding electrodes are separated from each other. A pair of pressurizing and energizing members formed on a pair of gun arms in order to apply a pressing force from a welding gun of a welding robot to the pair of gun arms and to energize the pair of gun arms. An auxiliary gun device for spot welding, characterized in that 2. A driving means for pressurizing and driving the pair of gun arms to a welding position is provided.
Auxiliary gun device for spot welding described in. 3. The auxiliary gun device for spot welding according to claim 1, wherein a spring member that elastically biases the pair of gun arms to a non-welding position is provided. 4. The spot welding auxiliary gun device according to claim 2, wherein the pair of gun arms are formed in a straight shape in a side view. 5. The spot welding auxiliary gun device according to claim 2, wherein the pair of gun arms are formed in an L shape in a side view.