JPS582554Y2 - spot welding equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a spot welding device in which a spot welding gun called a C-type gun is attached to a body such as a robot for welding.

When welding with this type of welding equipment, only the movable electrode of the welding gun is moved relative to the workpiece, so there is a problem that the workpiece is deformed by applying a large force to the fixed electrode side, and the electrode wears out. As a result, the welding point shifts toward the fixed electrode, which is becoming more noticeable.

For this reason, it has been proposed to support the welding gun so that it can slide freely relative to the machine body, but as a result of the movable electrode coming into contact with the workpiece and the reaction force pressing the fixed electrode against the workpiece, this still places an unreasonable force on the workpiece. works, and if the workpiece is thin, the above problem cannot be solved.

This invention was made in view of the above problem, and is designed to prevent deformation of the workpiece with a simple structure.

Examples will be described below based on the drawings.

1 and 2, 1 is a welding gun, a movable electrode 2 is attached to the tip of a piston rod 3a of a cylinder 3, and a movable electrode 2 is attached to the tip of a gun arm 4 connected to a cylinder body 3b of the cylinder 3, facing the movable electrode 2. The fixed electrode 5 is attached so as to.

6 is a robot with a body.

7 is a gun support mechanism, which includes a bracket 8 fixed to the robot 6, two guide rods 9 (only one is shown in the figure) attached parallel to this bracket, and a gun support mechanism fixed to the welding gas 1 and attached to the guide rods 9. The slide member 10 is slidably supported through the slide member 10.

11 is a second cylinder, the cylinder body 11a of which is attached to the lower part of the bracket 8, and the piston rod llb is attached to the lower part of the slide member 10.

A stopper 12 is screwed onto the upper part of the bracket 8 and secured with a nut, and the stopper 12 is disposed so that its tip faces the slide member 10.

The gap A between the stopper 12 and the slide member 10 is set so that the gap A between the stopper 12 and the slide member 10 is equal to the gap created between the fixed electrode 5 and the workpiece W when the welding gun 1 is moved by the robot 6, as shown in FIG. has been adjusted and set.

Among them, 13 is a spring that is attached to the bracket 8 and elastically supports the welding gun 1.

According to this embodiment, after moving the robot 6 and setting the welding gun 1 to the position where the workpiece W is to be welded, the second cylinder 11 is operated to move the slide member 10 to the stopper 1.
2.

As a result, the fixed electrode 5 of the welding gun 1 comes into contact with or approaches the lower surface of the workpiece W, and then, by operating the cylinder 3, the movable electrode 2 is pressurized and energized to the workpiece W to perform welding. It has become.

Moreover, the stopper 12 is not limited to the above-mentioned embodiment, and as shown in FIG. 3, the stopper 12 may be attached to the slide member 10 instead of the bracket 8, and furthermore, as shown in FIG.
While the bracket 8 button and guide rod 9 of the gun support mechanism 7 are attached to the welding gun 1, the slide member 10 may be attached to the robot 6. In addition, the cylinder body 11 of the second cylinder 11 and the slide member 10 of the nibot 6
Alternatively, the piston rods 1 and 1 may be attached to the bracket 8 of the welding gun 1, respectively.

In the case of FIG. 4, the stopper 12 is attached to the lower part of the bracket 8.

And Fig. 3 2. Similarly to the first embodiment, in the embodiment shown in FIG. 4, after moving the welding gun 1 to the welding position of the work W, the second cylinder 11 is operated to move the slide member 10 to the stopper 12. Even if the welding gun 1 is pressurized after that, no unreasonable force is applied to the workpiece W.

In the above three embodiments, the cylinder 3 of the welding gun 1 is activated after the second cylinder 11 is activated, but if the operations of both cylinders 3 and 11 are overlapped, the working time can be reduced. can be shortened.

As is clear from the above, this invention does not deform the workpiece during welding, can cope with electrode wear by simply adjusting the stopper, has a simple structure, and has great practical value.

[Brief explanation of drawings]

The drawings show an embodiment of this invention, and FIG. 1 is a front view of the first embodiment, FIG. 2 is a sectional view taken along the axis of the guide rod in FIG. 1, and FIGS. 3 and 4. FIG. 6 is a front view showing other embodiments. DESCRIPTION OF SYMBOLS 1... Welding gun, 2... Movable electrode, 3... Cylinder, 4... Gun arm, 4... Fixed electrode, 6...
Robot as a body, 7... Gun support mechanism, 8...
- Bracket, 9... Guide rod, 10... Slide member, 11-... Second cylinder (11a... Cylinder body, 11b... Piston rond), 12...
・Stopper.

Claims (1)

[Scope of utility model registration request] A welding gun consisting of a movable electrode attached to the piston rod of the cylinder and a fixed electrode attached to the gun arm opposite the movable electrode, a bracket and a guide rod button for movably attaching this welding gun to the machine body. A gun support mechanism consists of a slide member, a cylinder body is attached to one of the bracket and the slide member, and a piston rod is attached to the other, and when both electrodes of the welding gun are positioned sandwiching the work, the fixed electrode is moved close to the work. The second cylinder is comprised of a second cylinder which is controlled by one drive so that the second cylinder is moved, and a stopper which is adjustably attached to either the bracket or the slide member and which regulates the operating stroke of the fixed electrode. A spot welding device characterized in that a fixed electrode is brought into contact with or close to a workpiece, and at the same time or after that, a movable electrode is pressurized against the workpiece by a cylinder.