JP3148302B2 - Control device for resistance welding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a resistance welding machine for welding a work at an electrode by applying a large current to the work under pressure through an electrode.

[0002]

2. Description of the Related Art Conventionally, a control device for a resistance welding machine has generally been installed on a dedicated gantry provided at a place slightly away from an actual welding line. Due to economics such as installation of equipment, signal cables, and power cables, the number of cases where resistance welding control devices are installed near a welding machine is increasing. Further, since there is little extra space around the welding machine, the resistance welding control device itself tends to be downsized. Examples of welding systems designed for such purposes include systems in which the resistance welding control device is designed as small as possible and built into the welding robot control panel,
There is a system that optimizes the combination of a welding transformer and a resistance welding control device and performs input / output with the outside via serial communication.

[0003]

In automobile factories, resistance welding control devices are used in various forms. When these resistance welding control devices are roughly classified, a multi-welding machine, a welding robot, and a portable welding machine are used. , Are classified into stationary welding machines and the like, and the functions required of the welding control device are different for each of these uses. However, designing a control device for each application is not preferable in terms of usability and management. When one multi jig control panel controls a plurality of resistance welding control devices like a multi-welding machine, EIA standard RS
A system in which the input / output of the control device is performed by serial communication using multi-drop type hardware such as that described in US Pat. However, when used as a welding robot, stationary welding machine, or portable welding machine, a device for converting serial communication data to normal input / output is required for each resistance welding control device. There is a problem that the cost is higher than that of the above.

When input / output information, program data, and monitor data are mixed with data on serial communication,
Not only does the transmission time of input / output requiring high speed become slow, but also a dedicated serial data converter is required.
In a welding robot system that welds various plate sets with one unit, a pressure control function of the electrode pressing force is required.
When the pressure control function is built in the resistance welding control, the case itself becomes large. In addition, this is an obstacle to the use in a multi-welding machine that requires no pressure control and has little extra space. In the case of stationary welding machines and portable welding machines, resistance welding machine control devices are often mounted on welding machines and welding transformers, or installed near welding machines. The case is highly likely to be exposed to water, and the water resistance of the case is a necessary condition. Also recently,
In many cases, the control power supply of the resistance welding machine control device is used after stepping down the welding power supply, and although it is for miniaturization, a system requiring a separate control power supply increases the burden on the user and is not preferable in terms of safety.

An object of the present invention is to provide a control device for a resistance welding machine which can be used for various welding machines and can be arranged near a welding line.

[0006]

That is, the present invention provides a work
And a timer unit for welding control for setting and controlling welding data such as a pressing force, a pressurizing time, a current value, and an energizing time in a resistance welding machine that welds the work by energizing the work through the electrodes , and large-current control of the contactor unit which controls the opening and closing of the large current of the welding, the normal input
Contact input / output circuit for output function and electrode force control circuit
And a base unit for connecting a welding power source and a welding transformer to each other in a modularized control unit for a resistance welding machine.

[0007]

In the case of the resistance welding machine control device constructed as described above, the welding control device is different from a welding machine in the form of a resistance welding machine, for example, a multi-welding machine, a welding robot, a portable welding machine, and a stationary welding machine. Alternatively, since it is divided so as to be selectable and combinable into four modules by a common part as a whole, even if the circuit of the welding control device is different for each resistance welding machine, each welding machine having a different form by the combination of modules is selected. A welding control device can be easily formed.

[0008]

As a result, the present invention has an effect that a welding control device for each welding machine having a different form can be easily formed.

[0009]

Next, the configuration of an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the welding control device 1 is divided into a base unit 2, a contactor unit 3, a timer unit 4, and an option unit 5 molded with resin. That is, the base unit 2
Is a unit for connecting a welding power source, and 3
There are a set of cable entry holes 6 and two sets (four) of captyre cable connection bolts 7, and three types of entry methods are possible according to the installation mode of the welding control device 1. FIG. 4b is used for a normal floor-standing, wall-hanging or the like, and is used for mounting the welding control device 1 below a breaker 8 of a welding power source as shown in FIG. 5b. 4c is used for directly attaching the welding control device 1 to the welding transformer 9 as shown in FIG. 5c.

[0010] Base unit 2 and contactor unit 3
Are connected by three copper bolts, and 01, 02, 0
The contactor unit 3 functions as an electrode terminal of the bus bar 3 and can be directly attached to the bus bar without using the base unit 2. The contactor unit 3 includes a thyristor SCR and a thyristor SC for opening and closing the welding current.
Mainly high power such as CR absorber 10 for protecting R, current transformer CT for detecting welding current, ignition circuit 11 for sending ignition signal to thyristor SCR, down transformer 12 for supplying control power and synchronization signal from welding power source. The contactor unit 3 and the timer unit 4 are fixed with four hexagon socket head bolts, and the electric circuit is connected to the contactor unit 3 by the timer unit 4.
Automatically done by attaching to.

The timer unit 4 is a communication circuit 1 for inputting and outputting information such as welding data to and from an external circuit such as a sensor.
3 and a control circuit for controlling welding, a microcomputer 14 for managing and controlling the entire welding control apparatus 1 including data correction in accordance with a preset program, and the like. The communication unit 15 is attached, the timer unit 4 and the option unit 5 are also fixed by four hexagon socket head bolts as described above, and the connection of the electric circuit is automatically performed by attaching the contactor unit 3 to the timer unit 4. Done in

The optional unit 5 supplies an additional function, and can select a contact input / output circuit 16 and an electrode pressing force control circuit 17 for a normal input / output function. If not used, attach a cover on top of timer unit 4. In addition, between each of the base unit 2, the contactor unit 3, the timer unit 4, and the optional unit 5, a concave groove and a convex groove are cut so as to be fitted to each other.
Although it has a simple waterproof structure, the waterproofness can be further improved by inserting a packing between these grooves.

Next, the operation of this embodiment will be described.
When the welding control device 1 for a resistance welding machine configured as described above is used as a multi-welding machine, as shown in FIGS. 6 and 7, a contactor unit 3 and a timer unit connected between a welding power source and a welding transformer 9. 4 SCM is an arbitrary box, for example, a 1-pack box 18 for a single-phase 400V,
In this embodiment, the three-phase 400V two-pack box 19 or the three-pack box 20 is used. In the case of the present embodiment, up to fifteen units are linked and used. And, it is connected to a teaching box or reset box 23 and a repeater 24 connected to another repeater or a host computer.

When the welding control device 1 for a resistance welding machine is used by being incorporated in a robot control panel 25, FIG.
As shown in FIG. 9, the welding control device 1 is mounted in the robot control device panel 25 in a state where the welding control device 1 is mounted on the dedicated mounting panel 26, or placed in the SCM storage box 27 and laid sideways on the robot control device panel 25. In addition, S of the contactor unit 3 and the timer unit 4 of the welding control device 1
The CM is connected to a welding power source and a welding transformer 9 via a GT unit 28 for safety protection.

When the welding control apparatus 1 for a resistance welding machine is used as a portable or stationary type, FIG.
As shown in FIG. 1, the SC of the contactor unit 3 and the timer unit 4 connected between the welding power source and the welding transformer 9
M is used in the SCM storage box 27, and the start switch 29 for starting welding and the pressure control valve 30 are connected to the timer unit 4 via the option unit 5.

As a result, in the case of this embodiment, since the base unit 2 and the contactor unit 3 are fastened by the copper bolts serving also as electrodes, there is no need for a wire connection operation, and the connection between the contactor unit 3 and the timer unit 4 is not required. Has a structure in which the circuit is connected at the same time as the installation of the timer unit 4, so that no special connection work is required, and the connection between the timer unit 4 and the option unit 5 is the same as described above. In addition, an input / output transfer function by serial communication is equipped as standard, and even when multiple resistance welding control devices 1 are used like a multi-welding machine, the input / output signal line is connected by one link cable. Just complete,
The connection part of the link cable is formed as a connector, and is easy to maintain. In addition, it has a normal contact input / output circuit and an electrode pressing force control function as options, and can cope with various welding systems. In addition, when these options are not used, the option unit 5 is not required, so that space efficiency is good. In addition, it has an independent 3 channel serial communication line for each function of input / output, data, central management,
The resistance welding control device 1 can be accessed at high speed as a remote I / O of the sequencer. In addition, since all power is supplied from the welding power source, there is an effect that there is no need to supply a control power from the outside.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram of the entire resistance welding control device 1.

FIG. 2 is a perspective view showing an assembled state of the entire resistance welding control device 1;

FIG. 3 is a perspective view illustrating an entire disassembled state of the resistance welding control device 1.

FIG. 4 is an explanatory diagram showing a connection state of the base unit 2 which differs depending on a use method.

FIG. 5 is a perspective view showing an assembled state of the resistance welding control device 1 corresponding to FIG.

FIG. 6 is a system configuration diagram of the resistance welding control device 1 corresponding to a multi-welding machine.

FIG. 7 is a perspective view showing an exploded state of the resistance welding control device 1 for the multi-welding machine.

FIG. 8 is a system configuration diagram of the resistance welding control device 1 corresponding to a welding robot.

FIG. 9 is a perspective view showing an exploded state of the resistance welding control device 1 for the welding robot.

FIG. 10 is a system configuration diagram of a resistance welding control device 1 corresponding to a portable or stationary resistance welding machine.

FIG. 11 is a perspective view showing an exploded state of the resistance welding control device 1 corresponding to a portable or stationary resistance welding machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding control device 2 Base unit 3 Contactor unit 4 Timer unit 5 Option unit 9 Welding transformer SCR Thyristor CT Current transformer CT 11 Firing circuit 12 Down transformer 13 Communication circuit 14 Microcomputer 15 Communication connector 16 Contact input / output circuit 17 Electrode connection Pressure control circuit 18 Single-pack box for single-phase 400V 19 2-pack box for 3-phase 400V 20 3-pack box for 3-phase 400V 22 General-purpose sequencer 23 Teaching box or reset box 24 Repeater 25 Robot control panel 26 Special mounting panel 27 SCM storage Box 28 GT unit 29 Start switch 30 Pressure control valve

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-58-151964 (JP, A) JP-A-58-176087 (JP, A) JP-A-59-153588 (JP, A) JP-A 64-64 22472 (JP, A) JP-A-4-279286 (JP, A) JP-A-2-6082 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 11/24 H02M 9 / 00

Claims (1)

(57) [Claims] 1. A with pressurized workpiece, via the electrode
In a resistance welding machine that energizes a workpiece and welds the workpiece, a timer unit for welding control that sets and controls welding data such as pressing force and pressurizing time, current value, and energizing time, and open / close control of high-current welding Contactor unit for large current control and contact input / output circuit for normal input / output functions
Control unit for resistance welding machine characterized in that an optional unit with additional functions such as an electrode pressure control circuit and the like, and a base unit for connecting a welding power source and a welding transformer are modularized and provided so that they can be selected and combined with each other. apparatus.