JPH0437480A - Spot welding equipment - Google Patents

Abstract

PURPOSE:To reduce the cost of equipment and to make the equipment compact by integrating an electric power control element with a welding transformer and integrating a first means to control the electric power control element with a second means to control a robot. CONSTITUTION:Since a contact part 310 and the welding transformer 200 are integrated and a contact part 300 and a controller 400 are integrated, the equipment can be constituted extremely compactly. In addition, only a cable 700 connecting between the welding transformer 200 and a welding power source 500 meets the requirement as a high pressure cable wound externally and besides, water cooling of the contact part 310 and the welding transformer 200 can be carried out by using common piping.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in spot welding equipment.

[Conventional technology]

As shown in FIG. 2, a conventional spot welding device includes a robot 110 equipped with a spot welding gun 11, a welding transformer 20, a timer contactor 30, and a controller 4.
It is equipped with 0.

The timer contactor 30 includes a contactor section 31 formed by connecting thyristors Sl and S2 in antiparallel, and the thyristor S
The output of the welding power source 50 (for example, AC 400 V) is supplied to the primary side of the welding transformer 20 via the contactor section 31.

The controller 40 positions the robot 110, controls the opening and closing of the spot welding gun 11, sends and receives signals to and from the timer section 32, and the like.

[Problem to be solved by the invention]

The welding transformer 20 and timer contactor 30 are
They are water cooled to prevent heat generation, but in the conventional spot welding equipment mentioned above, the two are separated, so water cooling piping must be installed for each, which increases equipment costs. ing.

In addition, since the welding transformer 20 and the timer contactor 30 are arranged separately, the welding transformer 20 and the timer contactor 30, and the timer contactor 30 and the welding power source 5
High-voltage cables 60 and 70 must be laid between the two terminals, respectively, and this is also a factor in increasing equipment costs.

In view of this situation, an object of the present invention is to provide a spot welding device that can reduce equipment costs as much as possible and can be made more compact.

[Means to solve the problem]

The present invention provides a robot equipped with a spot welding gun, a welding transformer connected to the welding gun, a power control element interposed between the welding transformer and a welding power source, and a power control element for controlling the power control element. In a welding apparatus comprising a first control means and a second control means for controlling the robot, the power control element is integrated with the welding transformer,
Further, the first control means is integrated with the second control means.

[Effect]

A power control element integrated with the welding transformer is controlled by a first control means integrated with a second control means.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a spot welding device according to the present invention.

This spot welding device includes a robot 100 having a spot welding gun 101, a welding transformer 200 to which a secondary coil is connected to the welding gun 101, and a contactor section 310 integrally disposed in the welding transformer 200. ,
Controller 400 that controls robot 100
and a timer section 320 that is integrally provided with this controller 400.

The contactor section 310 has a configuration in which thyristors SIO and S20, which are power control elements, are connected in antiparallel, and is disposed inside or on the outer surface of a casing housing the welding transformer 200.

This contactor section 310 is interposed between one end of the primary coil of the welding transformer 200 and the welding power source 500 (for example, AC 400V).

The timer section 320 is a sequence timer that controls opening and closing of the contactor section 310 according to a predetermined sequence,
It is disposed inside or on the outer surface of the casing of the controller 400.

Note that this timer section 320 constitutes a so-called timer contactor together with the contactor section 310.

The controller 400 commands the timer section 320 to control the positioning of the robot 100 and to control the opening and closing of the spot welding gun 101, and to open and close the thyristors SIO and S20 in conjunction with the operation of the welding gun 101. It has the effect of giving a signal.

Now, when the spot welding gun 101 is operated to close,
The output signal of the timer section 320 causes the thyristors SI0,
520 is ignited, so that the output of the welding power source 500 becomes the thyristor S], 0. It is supplied to the primary coil of the welding transformer 200 via S20. As a result, a current flows through the spot welding gun 101, and a workpiece (not shown) is spot welded.

Then, when a signal indicating the passage of a predetermined welding time is output from the timer unit 320, the controller 400 releases the spot welding gun 101 based on this signal, thereby completing spot welding at a certain point. .

Note that the controller 400 is provided with an interlock section, and signals are exchanged between the controller 400 and the robot 100 and between the controller 400 and the timer section 320 via the interlock section.

In addition, the thyristor S10°S20 of the contactor section 310
A water-cooled heat exchange means (not shown) is provided in each of the welding transformer 200 and the welding transformer 200.

In the above embodiment, the contactor section 310 and the welding transformer 20
Since the contactor section 310 and the controller 400 are integrated, the structure can be extremely compact.

In addition, the high voltage cable to be wired externally is connected to the welding transformer 20.
0 and the welding power source 500, and the contactor section 310 and the welding transformer 200 can be water-cooled using a common piping.

Note that in the above embodiment, the welding transformer 200 is connected to the robot 1.
00, but the present invention is also effective when the transformer 200 is placed near the spot welding gun 101 on the robot 100.

〔Effect of the invention〕

In the present invention, a power control element interposed between a welding transformer and a welding power source is integrated with the welding transformer, and a first control means for controlling the power control element is used as a second control means for controlling the robot. Since it is integrated with the means, it can be configured extremely compactly.

In addition, wiring work for high-voltage cables is easy, and the power control element and the welding transformer can be water-cooled using common piping, so equipment costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a spot welding device according to the present invention, and FIG. 2 is a circuit diagram illustrating a conventional spot welding device. 100... Robot, 101... Spot welding gun, 200... Welding transformer 200. '310... Contactor section, 320... Timer section, 400... Controller, 500... Welding power source, 700... High voltage cable.

Claims (1)

[Claims] A robot equipped with a spot welding gun, a welding transformer connected to the welding gun, a power control element interposed between the welding transformer and a welding power source, and controlling the power control element. A welding apparatus comprising a first control means for controlling the robot, and a second control means for controlling the robot, wherein the power control element is integrated with the welding transformer, and the first control means controls the second control means. A spot welding device characterized in that it is integrated with a means.