JPH0715176U - Spot welding gun suspension fitting device with transformer - Google Patents

Abstract

(57) [Abstract] [Purpose] A hanging metal fitting device that facilitates position adjustment between the center of rotation and the center of weight of a large spot welding gun and enhances the rigidity of the gun arm to prevent misalignment between tips during pressurization. I will provide a. [Structure] A so-called spot welding gun with a transformer, in which a spot welding gun and a welding transformer are integrated, is suspended, and a hanging metal fitting device for rotatably operating the same is provided.
The welding gun is attached to the main body center of gravity through an adjusting means 10 which is movable in a plurality of directions so as to match the axis center line of the rotating shaft by the gun suspension member. Further, means for backing up the bending of the gun arm during pressurization is provided between the transformer and the pressurizing cylinder and / or gun arm of the welding gun.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bail support type hanging device for a portable spot welding gun.

[0002]

[Prior art]

 Conventionally, when welding a large work piece such as a railroad car or car body by hand, a large portable spot welding gun is hung and a human can move it rotatably to change the direction and orientation of the work piece. Welding is performed while changing according to the position of the welding point. In this case, there is a bail-support-type suspending device that suspends the gun body and balances the gun weight so that the electrode can be pressed at right angles to the point where the work is hit and the direction and orientation of the gun can be freely changed. Has been adopted.

As a conventional bail support type hanging metal fitting device, for example, Japanese Utility Model Publication No. 45-30584 “Rotary hanging metal fitting for electric resistance spot welder” is known.

This conventional device is composed of an outer ring pivotally mounted on a hanger and an inner ring inscribed in the outer ring and fixed to a welding gun body. The inner and outer peripheral surfaces of the outer and inner rings respectively correspond to the corresponding side. A guide groove is provided in the ball, and a ball is inserted into the guide groove.

With this, it is said that the force in all directions is always supported by the ball and the gun can be smoothly rotated.

However, this type of conventional device is effective for a small gun, but for example, a so-called trans-attached gun in which a welding gun and a welding transformer are integrated as in recent years, is used for the entire gun. As the structure and weight increase, the conventional bail support type has become unsatisfactory in terms of workability and economy as the structure becomes larger.

Therefore, according to Japanese Patent Application No. 5-286637 “Spot Welding Gun Lifting Metal Fitting Device”, which was previously filed by the same applicant as the present invention to solve the above-mentioned problems, a gun with a transformer is used, for example. As a hanging device for large welding guns, one or more hinges are provided at the center of gravity of the gun to balance the weight of the gun, and the structure is simple and easy to assemble so that there is no manual load, and space is not required. Moreover, it is excellent in improving operability.

[0008]

[Problems to be solved by the device]

 The problem to be solved by the present invention is that it is difficult to assemble the center of rotation exactly at the center of weight as calculated. In addition, in order to prevent core 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 is a bail support type hanging metal fitting device which integrates a spot welding gun and a welding transformer, and hangs a spot welding gun with a so-called transformer and rotatably operates it. (EN) Provided is a spot welding gun suspension fitting device which is attached to a portion through an adjusting means that is movable in the vertical and horizontal directions so as to match the axis center line of the rotating shaft by the gun suspension member.

In the welding gun with a transformer, a means for backing up the bending of the gun arm at the time of pressurization is provided between the transformer and the pressure cylinder and / or the gun arm of the welding gun. A spot welding gun suspension fitting device is provided.

The present invention facilitates the adjustment work for aligning the gun rotation center and the weight center position of the suspension fitting device, and also increases the rigidity of the gun arm without increasing the weight, and the core between the tips at the time of pressurization. The purpose is to prevent misalignment.

[0012]

【Example】

 FIG. 1 is a side view showing an embodiment of a bail support type suspension fitting device of the present invention for suspending a spot welding gun and rotatably supporting the spot welding gun. FIG. 2 is a view on arrow AA. Further, FIG. 3 is a front view thereof.

The spot welding gun in the figure is an example of what is called a transformer-equipped gun in which a C-type spot welding gun 1 and a welding transformer 2 are assembled. As is well known, the basic structure is such that the pressurizing device 4 is provided on the gun arm 3 and the electrode 5 and the electrode part 6 of the pressurizing device pressurize and energize the object to be welded. .

Reference numeral 7 is a ring-shaped bail support. The inner ring 8 supporting the welding gun rotates the inner circumference of the outer ring 9 by the bearing 0 interposed between the inner ring 8 and the outer ring 9. Reference numeral 10 is 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 the rotating portion provided at the lower end of the approximately L-shaped gun suspension member 12. It is what is done.

That is, a rotating portion is provided at the lower end of the gun suspension member, and the rotating shaft 14 thereof has a vertical plate 11 provided at the main body center of gravity of the bail support at the center of the rotating shaft. Thus, it is fixed via the horizontal plate 13. In this case, the plates are arranged and adjusted in the vertical and horizontal directions so that the center of rotation coincides with the center of gravity of the gun.

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

Reference numeral 16 denotes a lock device for fixing the positioning of the gun in the direction and attitude. In this case, the lock device locks by a handle operation, but other means such as a 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, reference numerals 18 and 19 are backup plates for reducing the core misalignment between the chips at the time of pressurization by only abutting or fixing the cylinder body 4 and the gun arm 3 to the welding transformer 2. Is.

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

FIG. 5 shows the horizontal plate 13 moving in the horizontal direction. The plate is provided with a plurality of screw holes d at positions corresponding to the elongated holes so that the bolt tightening position can be moved in the horizontal direction with respect to the rotary shaft 14.

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

The rotating shaft 14 is connected to the housing 22 of the gun suspension member 12 with the point (rotating shaft center line) aligned with the main body center of gravity of the welding gun. Therefore, the rotating shaft 14 and the bail support 7 can rotate the gun body in the two-dimensional direction.

According to the above configuration, the vertical plate and the horizontal plate provided on the rotary shaft of the gun suspension member can be adjusted in the vertical and horizontal points in accordance with the main body center position. Therefore, even if the total weight of the gun, including the weights of parts such as the welding transformer, secondary conductor, and pressure device, exceeds about 300 kilograms, the gun suspension member 12 is placed at the center of gravity of the entire gun. By matching the center lines of the rotary shafts 14, it is possible to effectively balance the weight.

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

When welding is completed, the lock device 16 is released, the gun is returned to the original free state, the gun is moved to the next welding point position and the gun posture is fixed at an arbitrary angle, and the welding operation described above is performed. Will be repeated.

In the embodiment of the present invention, a plurality of rotary shafts are provided between the welding gun and the gun suspension member in the two-dimensional direction via the gun bracket, but the rotary shaft of the gun suspension member is directly attached to the center of gravity of the gun. It may be provided.

[0027]

[Effect of device]

 As described above, according to the bail support type suspension fitting device of the present invention, when the center line of the rotary shaft of the gun suspension member is aligned with the center of gravity of the gun, it can be accurately and easily adjusted by the simple adjustment means provided on the rotary shaft. .

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

[Brief description of drawings]

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

FIG. 2 is a view on arrow AA of FIG.

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 a 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 and (B) is a side view.

[Explanation 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)

[Scope of utility model registration request] 1. A bail support type hanging fitting device for a so-called spot welding gun with a transformer, in which a spot welding gun and a welding transformer are integrated, wherein a rotary shaft formed by a gun hanging member is provided at a main body center of the welding gun. A spot welding gun suspension fitting device mounted via adjusting means that can move in multiple directions to match the axis center lines. 2. The spot welding gun suspension according to claim 1, wherein a means for backing up the deflection of the gun arm at the time of pressurization is provided between the transformer and the pressurizing cylinder and / or the gun arm of the welding gun. Metal fittings device.