JP2598990Y2 - Spot welding gun hanging bracket device with transformer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bail support type hanging device for a portable spot welding gun.

[0002]

2. Description of the Related Art Conventionally, when welding a manual work portion of a large work such as a railway car or a car body, a large portable spot welding gun is suspended, and this is manually moved by a human to rotate the gun. Welding is performed while changing the orientation of the workpiece according to the hitting position of the workpiece. In this case, a bail support type hanging bracket device that suspends the gun body and balances the gun weight so that the direction of the gun can be freely changed so that the electrode can be pressed at right angles to the hit point of the workpiece is used. Has been adopted.

[0003] As a conventional bail support type suspender, there is known, for example, Japanese Utility Model Publication No. 45-30584, "A rotatable suspender for an electric resistance point welder".

This conventional apparatus comprises an outer ring pivoted on a suspender and an inner ring which is inscribed in the outer ring and which fixes the welding gun body. The inner and outer peripheral surfaces of the outer and inner rings respectively correspond to corresponding side surfaces. Are provided with a guide groove, and a pole is inserted into the guide groove.

[0005] Thereby, the force in all directions is always supported by the pole, and the gun can be rotated smoothly.

However, this type of conventional apparatus is effective for a small-sized gun, but for example, the structure of the entire gun is, for example, a so-called transformer-equipped gun in which a welding gun and a welding transformer are integrated recently. As the weight and the weight increase, the conventional bail support type cannot be worked in terms of workability and economy due to an increase in the size of the structure.

Therefore, in order to solve the above-mentioned problem, Japanese Patent Application No. Hei 5-28637 filed earlier by the same applicant as the present invention has filed.
According to No. “Spot Welding Bracket Apparatus”, one or more hinges are provided at the center of gravity of the gun to balance the weight of the gun. However, the structure is simple, easy to assemble, and takes up little space so that no burden is applied.
Moreover, it is excellent in improving operability.

[0008]

[Problems to be Solved by the Invention] The problem to be solved by the present invention is that it is difficult to assemble the rotation center exactly at the position of the center of weight as calculated. In addition, in order to prevent misalignment between the electrode tips during pressurization, an increase in weight was unavoidable in order to increase the rigidity of the gun arm.

[0009]

Means for Solving the Problems The present invention has an inner ring.
Transformer integrating pot welding gun and welding transformer
The spot welding gun is fixed to the inner ring and the inner ring is
The outer ring is rotatably supported along the circumference, and the outer ring is
At the lower end of the gun suspension member to match the center of gravity of the gun
Bail support type suspension fitting connected to the rotating part
At the position of the center of gravity of the outer ring,
In multiple directions to match the axis of the rotating axis of the material
The movable adjusting means is the main body of gravity of the rotating part and the outer ring.
It is characterized by being mounted between the position .

Further, in the welding gun with a transformer, means for backing up the deflection of the gun arm during pressurization is provided between the transformer and the pressurizing cylinder and / or the gun arm of the welding gun. Tran
Scan with to provide a spot welding gun hanger device.

According to the present invention, it is possible to facilitate the adjustment work for matching the center of rotation of the hanging bracket device with the center of the weight, and to increase the rigidity of the gun arm without increasing the weight.
An object is to prevent misalignment between chips during pressurization.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing an embodiment of a bail support type suspension fitting device according to the present invention for suspending a spot welding gun and supporting the same in a rotatable manner. FIG. 2 is a view taken in the direction of arrows AA. FIG. 3 is a front view thereof.

The spot welding gun shown in the figure is an example of a so-called transformer gun in which a C type spot welding gun 1 and a welding transformer 2 are assembled. The basic structure is such that a pressurizing device 4 is provided on a gun arm 3 as is well known, and an object to be welded is pressurized and pressed by an electrode portion 5 provided on the gun arm and an electrode portion 6 of the pressurizing device.

Reference numeral 7 denotes a ring-shaped bail support. The inner ring 8 supporting the welding gun rotates around the inner periphery of the outer ring 9 by the bearing 0 interposed between the inner ring 8 and the outer ring 9. 1
Numeral 0 denotes an adjusting means which is assembled from a vertical plate 11 fixed to the outer ring corresponding to the position of the center of gravity of the gun and a horizontal plate 13 attached to a rotating part provided at the lower end of a substantially L-shaped gun hanging member 12. Things.

That is, a rotating portion is provided at the lower end of the gun hanging member, and a vertical plate 11 provided at the center of gravity of the gun of the bail support is aligned with the rotating shaft 14 so that the center of the rotating shaft coincides. Is fixed via a horizontal plate 13. In this case, the respective plates are arranged and adjusted in the vertical direction and the horizontal direction so that the center of rotation coincides with the position of the center of gravity of the gun.

Reference numeral 15 denotes a hook fixed to an upper portion of the gun suspending member, which is suspended by a wire of a balancer (not shown) moving on a rail provided on the ceiling.

Reference numeral 16 denotes a lock device for fixing the position of the gun in the directional orientation. In this case, the lock device is locked by operating the handle, but other means such as cylinder operation may be used. Reference numeral 17 denotes a secondary conductor connected between the electrodes of the welding transformer and the welding gun.

Next, 18 and 19 are backup plates.
For the welding transformer 2, the cylinder body 4 and the gun arm 3
Is used to reduce the misalignment between chips during pressurization.

Next, an example of the configuration of the adjusting means will be described.
FIG. 4 shows a vertical plate 11 that moves in the vertical direction as the adjusting means 10. As shown in FIGS. 4A to 4C, this shape is provided with a screw hole b on a surface fixed to the bail support side, and a vertical direction on a surface fixed to the gun suspension member side. Two parallel long holes c are formed so that the movement can be adjusted.

FIG. 5 shows a horizontal plate 1 moving horizontally.
3 is shown. The plate is provided with a plurality of screw holes d at positions corresponding to the long holes so that the bolt tightening position can be moved in the horizontal direction with respect to the rotating shaft 14.

FIG. 6 shows the rotating shaft 14. The rotating shaft is rotatably inserted into a rotating bearing 20 of a housing 22 of the gun suspension member 12, as shown in FIGS. An elongated hole e for fastening the horizontal plate 13 with bolts is provided in the seating surface 21 of the rotating shaft.

The rotating shaft 14 is a main body of the outer ring welding gun.
A point connected to the position of the center of gravity , point (rotation axis center line)
And connected to the housing 22 of the gun suspension member 12
Is done. Therefore, the gun body can be rotated in two directions by the rotating shaft 14 and the bail support 7.

According to the above configuration, the rotation of the gun suspension member
The horizontal plate 13 provided on the shaft 14 and the vertical plate provided on the outer ring
With the straight plate 11 , the point can be adjusted in the vertical and horizontal directions in accordance with the position of the center of gravity. Therefore, even if the total weight of the gun including the components of the welding transformer, the secondary conductor, the pressurizing device and the like exceeds about 300 kg, the gun suspension member 12 is attached to the center of gravity of the entire gun. The weight balance can be effectively obtained by matching the axis center lines of the rotating shaft 14.

When performing a welding operation, the direction of the gun is moved two-dimensionally at an arbitrary angle with respect to the workpiece, and when the state of the appropriate posture is determined, the gun posture is locked. After locking, the welding operation is repeated in the same position.

When the welding is completed, the locking device 16
Is released, the gun is returned to the original free state, the gun is moved to the next welding point, the gun attitude is fixed at an arbitrary angle, and the above-described welding operation is repeated.

In the embodiment of the present invention, a plurality of rotating shafts are provided in a two-dimensional direction between the welding gun and the gun suspending member via the gun bracket, but the rotating shaft of the gun suspending member is directly connected to the center of gravity of the gun. May be provided.

[0027]

[Effect of the Invention] As described above, according to the present invention, the
Bail support that supports the rotary welding gun biaxially
Type heavy-duty bracket, suspending a heavy gun body
In order to balance the gun weight, the center of the rotation axis of the gun suspension should be aligned with the center of gravity of the gun.
The centerline of the rotation axis should be aligned vertically and
It can be accurately and easily adjusted by simple adjusting means movable in the horizontal direction . Therefore, a gun with a transformer
Even if the overall structure and weight of the gun increases,
Workability can be sufficiently improved with a port type.

Further, according to the present invention, by adding a simple backup plate, the rigidity of the pressurizing device and the gun arm can be increased and the misalignment between the chips during pressurization can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a front view of the device of the present invention.

FIG. 4 shows a vertical plate of the adjusting means in the device of the present invention. (A) is a front view, (B) is a side view, and (C) is a plan view.

FIG. 5 is a plan view showing the horizontal plate of the adjusting means in the device of the present invention.

FIG. 6 shows a rotating shaft in the device of the present invention. (A) is a plan view, (B) is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spot welding gun with transformer 2 Welding transformer 3 Gun arm 4 Pressurizing device 5 Electrode part 6 Electrode part 7 Bail support 8 Inner ring 9 Outer ring 10 Adjusting means 11 Vertical plate 12 Gun suspension member 13 Horizontal plate 14 Rotating shaft 15 Hook 16 Locking device 17 Secondary conductor 18 Backup plate 19 Backup plate 20 Bearing

Claims (2)

(57) [Scope of request for utility model registration] A spot welding gun and a welding tiger are provided in an inner ring.
A spot welding gun with a transformer that integrates the
The inner ring is rotatably supported along the inner circumference of the outer ring
The outer ring is aligned with the center of gravity of the welding gun.
Connected to the rotating part provided at the lower end of the gun hanging member
In the bail support type hanging bracket device, the outer ring book
Align the center line of the rotation axis of the gun suspension member with the center of gravity.
Adjusting means that can be moved in multiple directions for matching
Being mounted between the rotating part and the true center of gravity of the outer ring
And a spot welding gun hanging bracket device with a transformer. 2. The spot welding gun according to claim 1, further comprising means for backing up the deflection of the gun arm during pressurization between the transformer and a pressurizing cylinder and / or a gun arm of the welding gun. Hanging bracket device.