JPS628930Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a spot welding machine.

Spot welding machines are widely used in automobile body assembly processes and the like. By the way, conventional spot welding machines are installed upright on the floor of a factory, and not only do they occupy a certain floor area, but when the workpiece, that is, the body, is large like a light bath, the spot welding machine The spot welding machine may be located 2 m or more above the floor, making the spot welding machine large.

The present invention was developed in view of this situation, and its purpose is to be suitable for cases where the spot position is relatively higher than the floor surface, and to eliminate the need for a specific occupied floor area.
Moreover, it is an object of the present invention to provide a spot welding machine that can be downsized.

In order to achieve the above object, the present invention includes a pendulum frame suspended vertically swingably from a beam in a factory, and a pendulum interposed between the pendulum frame and the beam. A frame drive cylinder that swings the frame, an arm that is attached to the pendulum frame so that it can swing laterally, a spot gun that is attached to the tip of this arm and can hold a workpiece in the vertical direction, and a spot gun that drives the same. The gun drive cylinder is configured to include a guide that is assembled to the pendulum frame and comes into contact with the work when the pendulum frame is swung toward the work to position the pendulum frame relative to the work.

The spot welding machine according to the present invention having the above configuration is installed suspended from a beam in a factory, so it is suitable not only for cases where the spot position is relatively higher than the floor level, but also for cases where a specific occupied floor area is not required. First, the space below the spot welding machine can be effectively utilized. Furthermore, the spot welding machine according to the present invention allows the workpiece to be transported by the conveyor or other transport device even when the spot gun is clamping the workpiece and performing spot welding by the swinging motion of the pendulum frame and the arm. , it is possible to automate the operation of the frame drive cylinder and the gun drive cylinder, and to energize the spot gun as appropriate according to the conveyance of the workpiece, without requiring any large-scale copying means, and the spot welding machine Miniaturization can be achieved.

An embodiment of the present invention will be described below based on the drawings. FIG. 1 shows a spot welding machine according to the present invention, which is used for spot welding a roof drip channel to the roof of a light bath. In a spot welding machine, a pendulum frame 10 (hereinafter simply referred to as frame) is attached to a beam 12 in a factory with a shaft 14 and both brackets 1.
6 and 16 so as to be swingable in the vertical direction. A rod 22 of a cylinder 20 is connected to the frame 10 via a bracket 18 to the beam 12 so as to be able to swing vertically.
The rod 22 and the frame 10 are connected by passing the tip of the rod 22 through a hole 10a provided in the frame 10 so that it can move forward and backward, and preventing it from coming off with a pin 24.
It can swing freely when it is not in contact with the

Further, an arm 26 and a pair of guide rollers 28, 28 are assembled to the frame 10. The arm 26 is attached to the rear portion of the lower end of the frame 10 via a shaft 30 so as to be able to swing laterally, and a known spot gun 32 and a cylinder 34 for driving the same are attached to the distal end of the arm 26. The spot gun 32 has a base plate 36 at the tip of the arm 26.
As shown in FIG. 3, the roof W1 of the light bus W and the roof drip channel W2 can be held in the vertical direction. Further, the spot gun 32, together with the arm 26, has a spring 38 interposed between the frame 10 and the base plate 36, as shown in FIG.
The light bus W is biased toward the entrance of the light bus W (upper side in FIG. 2), and is held tilted at an angle θ with respect to the frame 10. Note that the base plate 36 is attached to the arm 26 so as to be slidable in the vertical direction, and the amount of sliding can be adjusted by an adjustment screw 40. On the other hand, the guide rollers 28, 28 are rotatably assembled to the tip of the frame 10 via a shaft 42 and a bracket 44, and the frame 10 is attached to the roof W1.
When the frame 10 swings toward the roof drip channel W2, the frame 10 comes into contact with the roof drip channel W2 as shown in FIG.
1 and the roof drip channel W2.

In the spot welding machine configured as described above, before the light bus W is transported from the loading port to a predetermined loading position by a conveying device such as a conveyor, the frame is 10 etc. are lifted by a predetermined amount by the cylinder 20, and the spot gun 32 is inoperative.

By the way, when the light bus W is transported to a predetermined loading position, the cylinder 20 is actuated by a workpiece loading signal from the conveyor drive unit, the rod 22 is extended, and the frame 10 etc. swing around the shaft 14 due to its own weight. , both guide rollers 28, 28 come into contact with the roof drip channel W2 and stop. Even after the guide rollers 28, 28 come into contact with the roof drip channel W2 and stop, the rod 22 extends by Δl and stops, so the guide rollers 28, 28 are caused by the weight of the frame 10 etc. to cause the roof drip channel W2 to stop. It is pressed against channel W2.
(See FIG. 4) When such a state is reached, pulse signals are transmitted from the conveyor drive section at regular intervals, and the spot gun 32 is operated repeatedly in response to these pulse signals. The spot gun 32 is operated by operating the cylinder 34, causing the spot gun 32 to clamp the roof W1 and the roof drip channel W2, and applying a predetermined voltage to the spot gun 32 for a predetermined time. This is done by applying a current. When this spot gun 32 is activated, the light bus W
Even when the roof W1 and the roof drip channel W2 are being transported, the spot gun 32 can continue to hold the roof W1 and the roof drip channel W2 and perform spot welding. This is the second
As shown in the figure, as the light bus W is transported, the frame 10 swings by ΔL using the shaft 14 as a fulcrum, and the arm 26 and the spot gun 32 move along the shaft 30.
This is guaranteed by swinging at an angle of 2θ using the fulcrum as the fulcrum. Note that during this time, the guide rollers 28,
28 leaves the roof drip channel W2.

In this way, when the light bus W is transported to a predetermined unloading position, the repeated operation of the spot gun 32 is stopped by the unloading signal from the conveyor drive unit, and the cylinder 20 is activated to return to the state shown in FIG. 3. .

As is clear from the above explanation, since the spot welding machine is a hanging type, it is possible to easily weld even when the spot position is relatively higher than the floor level, and it also does not require a specific occupied floor area. First, the space below the spot welding machine can be effectively utilized. Further, the spot welding machine can move the light bus W onto a conveyor, etc. even when the spot gun 32 is gripping and spot welding the roof W1 and the roof drip channel W2 by the swinging motion of the pendulum frame 10 and the arm 26. Because it can be transported by the transport device of cylinder 2
0 and 34 and energizing the spot gun 32 as described above in accordance with the transportation of the light bus W, automation is possible without requiring any large-scale copying means, and the spot welding machine can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a spot welding machine according to the present invention, FIG. 2 is a schematic plan view of the same portion, and FIGS. 3 and 4 are operation explanatory views. Explanation of symbols, 10... Pendulum frame, 12...
Beam, 20...Frame drive cylinder, 26...
... Arm, 28 ... Guide roller, 32 ... Spot gun, 34 ... Gun drive cylinder, W ... Light bus (work).

Claims (1)

[Scope of utility model registration request] A pendulum frame suspended from a beam in the factory so as to be able to swing vertically; a frame drive cylinder that is interposed between the pendulum frame and the beam to swing the pendulum frame; and a frame driving cylinder that swings the pendulum frame laterally. A movably assembled arm, a spot gun that is attached to the tip of this arm and can grip a workpiece in the vertical direction, a gun drive cylinder that drives the gun, and a gun drive cylinder that is attached to the pendulum frame so that the pendulum frame can be used as a workpiece. A spot welding machine comprising a guide that positions the pendulum frame relative to the workpiece by coming into contact with the workpiece when the spot welding machine swings toward the workpiece.