JPH01249273A - Clamping gun device - Google Patents

Abstract

PURPOSE:To perform spot welding on a deep welding place of material to be welded by providing electrodes for welding respectively on the tips of first and second arms and providing a supply source of electrification with an ounce copper plate an bus bars as an electric path outward a fixed jig with respect to these electrodes. CONSTITUTION:A piston rod 73 of a pressurizing cylinder device 7 is retreated and the first arm 4 is oscillated in the anticlockwise direction and the second arm 6 is oscillated in the clockwise direction and the material W to be welded is located at a gap between the electrodes 9 for spot welding. Further, the first and second arms 4 and 6 are oscillated in the opposite directions and pressed between the electrodes 9 by extending the piston rod 73. Power receiving chips 15 fitted to the tips of the first and second bus bars 11 and 12 are then pressed and electrified by a portable welding gun 16 arranged outward the fixed jig. By this method, the spot welding can be easily performed on the deep welding place of the material to be welded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a device for spot welding a plurality of steel plates by superimposing them on each other, which fixes and holds the welding location, and which performs spot welding by being supplied with power from the outside. Regarding.

[Prior art] Conventionally, when spot welding a large workpiece (for example, an automobile body) made of a combination of multiple steel plates, the workpiece is fixed with a fixing jig and a portapull spot welding method is used. Welding is performed by a worker directly operating a welding gun, or by attaching a spot welding gun to the arm of an industrial robot.

[Problems to be solved by the invention] However, it is good if the welding gun can directly reach the welding point of the workpiece, but if the welding point is located deep inside the workpiece, pressure cannot be applied. With a normal welding gun equipped with a cylinder and a current-carrying cable, it may not be possible to easily reach the welding gun because it interferes with the jig that fixes the object to be welded or the object to be welded. In such a case, the operator must enter the jig or the object to be welded with the welding gun and carry out the welding work, which poses a problem of poor workability and unfavorable safety.

[Means for Solving the Problems] Therefore, the present invention utilizes a clamp device for fixing and holding a workpiece to be welded, and a spot welding electrode is installed at the tip of an arm of this clamp device that clamps the workpiece. In addition to fixing the electrode, one end of the electrical path for supplying power to this electrode is placed outside the fixing jig, and this end is compressed by a spot welding gun to supply power. This makes it possible to weld difficult and deep welding points.

As a means for this purpose, a support leg is provided upright on a substrate, a first arm is swingably pivoted to the tip of the support leg by a support shaft, and a support leg is provided in correspondence with the first arm. a second arm that is pivotably pivoted to the tip by the support shaft; a cylinder body is pivotably pivoted to the base end of the first arm; and a piston rod tip is attached to the base end of the second arm. a pressurizing cylinder device which is pivotally mounted, a pair of spot welding electrodes which are fixed to opposite ends of the first arm and the second arm, and this pair of "Wb".
'II, each other end of which is connected to one end, and the other end of each of the ounce copper plates is connected to one end, and the other end is arranged so as to protrude outward from the board, The first and second boosters are arranged in parallel and insulated from each other.

[Function] By the means described above, the spot welding electrodes fixed to the ends of the first and second arms directly clamp the welding part of the workpiece to fix and hold the workpiece, and then The outwardly protruding ends of the first and second boosters are pinched by a porta-pull spot welding gun or a spot welding gun attached to the arm of an industrial robot, and the first and second boosters and the ounce copper plate are then compressed. By supplying power to the electrode via the welding device, the workpiece is welded.

Even when the clamping pressure by the spot welding gun is released, the clamping pressure at the welding location by the first arm and the second arm is maintained as it is, and the workpiece to be welded is held.

[Example code] Hereinafter, the present invention will be described in detail based on the drawings.

In the drawing, reference numeral 1 denotes a board fixed on a pedestal 2, and a pair of support legs 3.3 are vertically mounted on this board 1.
An intermediate portion of a first arm 4 is pivotably attached to the upper end of the arm 3 by a support shaft 5. Moreover, at the upper end of this support leg 3.3,
An intermediate portion of the second arm 6 is pivotally connected coaxially with the first arm 4 by the support shaft 5. That is, the first arm 4 and the second arm 6 are held between a pair of support legs 3.3 and pivotably supported around a support shaft 5.

A cylinder body 71 of a pressure clamp device 7 is pivotally attached to the base end of the first arm 4 by a pin 72, and a cylinder body 71 of the pressure cylinder device 7 is pivotally attached to the base end of the second arm 6. The tips of the screws 1 to 73 are pivotally connected by a clevis 74 and a pin 75. These, the first arm 4,
The second arm 6 and the pressurizing cylinder device 7 constitute a clamp device for fixing and holding the welded object 1w.

At the tips of the first arm 4 and the second arm 6,
An electrode holding plate 8.8 is fixed to the mutually opposing surfaces via an insulating plate 81.81, and a spot welding electrode 9.9 is fixed to this electrode holding plate 8.8.

Connecting plates 82.83 projecting to one side of the clamping device are fixed to the electrode holding plates 8.8, respectively, and bendable ounce copper plates 10.83 are attached to the protruding ends of the connecting plates 82.83.
Fix one end of each. Further, the other end of one of the ounce copper plates 1o, 1o is fixed to one end of the first booth spar 11, and the other end of the other ounce copper plate 10 is fixed to one end of the second booth spar 12. Said first booth spar 11
The second booth spar 12 is formed by bending a copper plate made of chrome copper or the like into a two-character shape, and the second booth spar 12 is formed by bending a copper plate made of chrome copper or the like into an L-shape, with the e-ends of each bent in parallel. Thus, it is fixed to the support plate 13 protruding from the one support leg 3. The first booth spar 11 and the second booth spar 12 are interposed between the first booth spar 11 and the support plate 13 and between the first booth spar 11 and the second booth spar 12, respectively. Insulating plate 14
．． It is electrically insulated by 14. Furthermore, a power receiving chip 15.15 is attached to the tips of the first booth spar 11 and the second booth spar 12 that protrude outward from the clamp device.

In addition, in FIG. 1, 16 indicates the tip of the spot welding gun.

Next, the operation of the clamping gun device configured as above will be explained. First, the pressurizing cylinder device 7
The piston rod 73 is moved back, the first arm 4 is swung counterclockwise in FIG. A gap is provided between the two, and the welding point of the workpiece W is positioned in this gap, and the piston rod 73 of the pressurizing cylinder device 7 is extended.
The arm 4 and the second arm 6 are swung in opposite directions, and the pair of electrodes 9 and 9 are pressed together.

As a result, the welding portion of the eIW to be welded is positioned and fixed.

Next, the power receiving chimps 15.15 attached to the tips of the first booth spar 11 and the second booth spar 12 are pinched and energized by the portable spot welding gun 16 operated by the operator. As a result, the welding current from one electrode of the two-spot welding gun 16 flows to the spot welding electrode 9 via the power receiving tip 15, the first booster 11, the ounce copper plate 10, and the electrode holding plate. Further, it passes through the welding target #-W, and from the other spot welding "@pole 9, via the electrode holding plate 8, the ounce copper plate 10, the second booster 12, and the power receiving tip 15, the spot welding gun 16 flows to the other electrode, and welds the object W to be welded. After a predetermined pressurization and energization time has elapsed, the clamping pressure by the spot welding gun 16 is released and welding is completed.

Note that the portable spot welding gun 16 may be operated by an industrial robot rather than by a worker.

Welded! The ivW is fixedly held by the first arm 4 and the second arm 6, and the welding portions of the pond are welded. After all the welding is completed, the piston rod 73 of the pressurized cylinder device 7 is moved back, the tips of the first arm 4 and the second arm 6 are expanded, the workpiece W to be welded is taken out, and the next A new workpiece W to be welded is brought in.

In the above explanation, - number of clamping gun devices are explained, but a plurality of these clamping gun devices are provided to fix and hold the workpiece W to be welded, and power is supplied one after another by the spot welding gun. It is recommended to weld at multiple locations.

[Effects] As explained in detail above, according to the present invention, spot welding electrodes are attached to the tips of the first arm and the second arm of the clamp device that clamps the workpiece W, and By connecting an electrical path using an ounce copper plate to the electrode and a booth spar, and locating the current supply end outside the fixing jig, it is possible to weld deep parts of the workpiece that are difficult to weld with a normal porta-pull spot welding gun. Spot welding can be easily carried out at any point.

Furthermore, when operating a spot welding gun attached to the arm of an industrial robot, it is not necessary to change the direction of the welding gun in a complicated manner, so the movement of the robot can be simplified. Therefore, the energizing cable of the spot welding gun is less likely to be twisted, and the life of the energizing cable can be extended.

Furthermore, as shown in the above embodiment, by fixing a power receiving chip to the protruding end of the booster and supplying power by clamping this power receiving chip with a spot welding gun, the position of the clamped part can be determined by the spot welding gun. In addition, the power receiving chip is the only one that needs to be strained by the pinch pressure, and can be easily replaced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a side view of a clamping gun device according to the invention, and FIG. 2 is a plan view. DESCRIPTION OF SYMBOLS 1... Board, 3... Support leg, 4... First arm, 5... Support shaft, 6... Second arm, 7
... Pressure cylinder device, 71 ... Cylinder body, 73 ... Piston rod, 9 ... Spot welding electrode, 10 ... Ounce copper plate, 11 ... First
Booth bar, 12...Second booth bar.

Claims (1)

[Claims] (1) A support leg erected on a board, a first arm pivotally pivoted to the upper end of the support leg by a support shaft, and a support leg attached to the upper end of the support leg corresponding to the first arm. a second arm pivotably pivoted by the support shaft; a cylinder body pivotably pivoted to the base end of the first arm; and a piston rod tip end mounted to the base end of the second arm. A pressurizing cylinder device pivotably mounted, a pair of spot welding electrodes fixed to opposite ends of each of the first arm and the second arm, and a bending device having one end connected to each of the pair of electrodes. an ounce copper plate; the other end of each of the ounce copper plates is connected to one end, and the other end is arranged so as to protrude outward from the substrate, and first and second plates are electrically insulated and arranged in parallel. A clamping gun device comprising a second booth bar.