JPS6031033Y2 - spot welding equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a spot welding device.The purpose of the invention is to integrate the work clamp positioning mechanism with the gun body in a pincher type spot welding gun, thereby simplifying the structure and reducing the installation space. The aim is to make it possible to make dots even at the edges of the workpiece.

Conventionally, when positioning the workpiece in a spot welding device using a pincher-type spot welding gun,
The clamp positioning device was installed separately and parallel to the spot welding gun.

This conventional device will be explained with reference to FIGS. 1 to 3.

1 is a pincher type spot welding gun.

That is, a pair of gun arms 3 and 4 are pivoted to the fixed frame 2 by pivots 2a so as to be openable and closable in the shape of scissors, and have electrode tips 5 and 6 facing each other at their tips.

The gun arms 3 and 4 are mutually operated to open and close by a cylinder 7.

lla and llb are secondary cables connected to the respective gun arms 3 and 4.

On the other hand, a clamp positioning device 14 for a workpiece W, which is separately installed in parallel with the spot welding gun 1, has a fixed receiving piece 8 that abuts the inner surface of the workpiece W, and a cylinder 10 that rotates the clamp positioning device 14 to It is composed of a movable pressing arm 9 that comes into contact with the receiving piece 8 and the pressing arm 9, and has a structure in which the workpiece W is held between the receiving piece 8 and the pressing arm 9 for clamp positioning.

In this case, the spot welding gun 1 and the clamp positioning device 14 are installed side by side, which requires a large installation space l between them, and when the end of the workpiece is to be welded, the effect of the clamp positioning device 14 cannot be obtained and There was a problem in that it was difficult to reliably hit the ball in the correct position.

Furthermore, the configuration is complicated by the equipment cost of the separately placed clamp positioning device 14 itself, fluid pressure piping equipment to the cylinder 10, and ancillary equipment of the control device.

Furthermore, since the clamp positioning portion of the workpiece W is located further away from the welding point position of the spot welding gun, there is also the drawback that reliable positioning action is lacking.

The present invention is an improved structure that eliminates the above-mentioned conventional drawbacks, and examples thereof will be described below with reference to FIGS. 4 to 6.

1 is a pincher type spot welding gun, and 2 is a fixed frame.

One gun arm 4 of the pair of gun arms 3 and 4 whose tip electrode tip 6 contacts the inner surface of the workpiece W is fixed to this fixed frame 2, and the tip electrode tip 5 contacts the outer surface of the workpiece W. The other gun arm 3 on the abutting side is rotatably supported by a pivot 2a.

This movable gun arm 3 is connected to a rotation cylinder 7.

Further, on both sides of the electrode tip 6 of the gun arm 4 on the fixed side, positioning pieces 12 that come into contact with the inner surface of the workpiece W are provided.

11a is a secondary cable connected to the gun arm 4 on the fixed side; 13 is a secondary cable connected at one end to the gun arm 3 on the movable side;
It is an ounce copper plate whose other end is connected to the connection point of the secondary cable lla.

According to the present invention having the above structure, the receiving piece 12 provided on the fixed side gun arm 4 comes into contact with the hitting point position on the inner surface of the workpiece W,
By rotationally pressurizing the movable gun arm 3 by the pressurizing cylinder 7, spot welding can be achieved simultaneously with clamp positioning of the workpiece W.

Therefore, there is no need to install the clamp positioning device in parallel with the spot welding gun, and the space is within 1□ of the width of the spot welding gun itself, making it possible to perform dots even at the edges of the workpiece, and the clamp positioning part is located at the dot position. This position is closest to the position, and positioning can be reliably obtained and spot welding can be performed correctly at a predetermined position.

Furthermore, the clamp positioning operation of the workpiece is performed by the spot welding gun itself, and unlike the conventional method, a dedicated cylinder is not required, which has the advantage of simplifying the equipment and saving energy.

Additionally, by connecting an ounce copper plate to the gun arm on the movable side, it has the effect of preventing breakage and reducing power consumption.

[Brief explanation of drawings]

Fig. 1 is a plan view of the conventional device, Fig. 2 is a side view of the spot welding gun, Fig. 3 is a side view of the clamp positioning device, Fig. 4 is a side view of the device of the present invention, Fig. 5 is a plan view, FIG. 6 is a perspective view of the main parts. 1... Spot welding gun, 3, 4...
Gun arm, 5, 6... Electrode tip, 7...
...Pressure cylinder, 12...Receipt piece.

Claims (1)

[Scope of utility model registration request] A gun arm having an electrode tip at its tip that contacts the inner surface of the workpiece is fixed to a fixed frame, and a gun arm whose tip has an electrode tip that contacts the outer surface of the workpiece and is pressurized by a pressure cylinder is pivotally supported. A spot welding device characterized in that positioning pieces are provided on both sides of the electrode tip of the fixed gun arm for abutting against the inner surface of the workpiece.