JPS61222682A - Arc welding machine - Google Patents

Abstract

PURPOSE:To increase the working efficiency in welding by providing two terminal type variable constant current controller inside a remote control device and by arranging an output level control circuit inside a welding power source device as well. CONSTITUTION:A two terminals type variable constant current controller 2 is provided inside a portable remote control device 3. Inside a welding power source device 1, a welding power source device driving circuit and output level control circuit are arranged. The output level control circuit is driven by the second power source circuit with the first power source of commercial power source as the common power source of the two terminals type variable constant current controller 2 and welding power source device driving circuit. A proper control of the output current of the variable constant current controller 2 is performed via the opening and closing of a torch switch. Due to the power source device driving circuit and output level controlling circuit being enabled to be driven and controlled by the output current of the controller 2 with this method, the number of control signal cables is reduced and the working efficiency is increased.

Description

Detailed Description of the Invention: 1. Improving color skin ■ Photo-interchangeable color The present invention relates to an improvement of an arc welding machine that performs arc welding by operating a remote control device, and relates to self-shielded welding using welding wire, CO □Welding, MAG welding, MI
In addition to the G method, it is also applicable to the TIG method.

A conventional arc welding machine of this type is shown in FIG. In the figure, 100 is a welding power supply device, 200 is a remote control device containing a welding wire, 300 is a torch switch, and 40
0 is the base material.

In a typical arc welding machine, as shown in the figure, a welding power supply device 100 includes a main transformer lO1, an output control section 102, and a speed control circuit 1 for a welding wire feeding motor.
The remote control device 200 includes a welding wire 201, a welding wire supply roll 202, a supply motor 203, a motor speed iPi regulator 204, and an output regulator 205. In such an arc welding machine, the remote control device 200 and the welding power source value r! ! 100 is connected via many control signal cables, as is clear from the figure. However, since such an arc welding machine is generally used by moving the remote control device 200, if the wiring structure between the welding power supply device 100 and the remote control device 200 becomes complicated, work efficiency will be significantly reduced. <There are problems such as deterioration.

The problem to be solved by the present invention is to provide an arc welding machine with a simplified wiring structure that can eliminate the drawbacks of ridges.

The solution proposed by the present invention for controlling the micrometer is to provide an arc welding machine having the following configuration.

That is, this arc welding machine is an improvement of an arc welding machine equipped with a remote control device that performs arc welding by remotely controlling the output supplied to the welding load from the welding power supply device. ) A two-terminal variable constant current controller is installed in the remote control device; 2) A two-terminal variable constant current controller is installed in the welding power source when the output current of the two-terminal variable constant current controller exceeds a certain level. A welding power supply drive circuit that sometimes drives the welding power supply, and an output level control circuit that variably controls the control output of the welding power supply according to the output signal level of the two-terminal variable constant current controller. According to the device of the present invention, the remote control device includes a two-terminal variable power source configured to be operated by a power source (first power circuit) provided in the welding power source device. A constant current controller is provided, and the output current of this two-terminal type variable constant current controller controls the welding power supply bag 2.
Since the configuration is such that the drive circuit and output level control circuit can be driven and controlled, the drive signal (digital signal) of the welding power supply and the output control signal (analog signal) of the welding power supply can be transmitted via a common control signal cable. Since it can be transmitted using
This has the advantage that the number of control signal cables required for welding work can be simplified, welding work becomes easier, and welding work efficiency can be improved.

In particular, when constructing the device of the present invention, if the two-terminal constant current controller and the welding power source are connected with a one-core or two-core control signal cable, the advantages in such a case can be greatly increased. It is.

In addition, since the wiring structure of the arc welding machine can be simplified in any case, it is not only extremely easy to transport the remote control device and handle it during maintenance, but also the voltage due to the resistance of the welding cable and the welding current. It also has the advantage of being less affected by descent.

Furthermore, in addition to the above configuration, if the first power supply circuit and the second power supply circuit, which is the drive power source for the output level control circuit, are configured to be electrically isolated from each other, the influence of voltage noise can be reduced. This makes it a highly reliable arc welding machine with particularly excellent noise resistance.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the arc welding machine of the present invention will be described below with reference to the attached drawings.

In FIG. 1, 1 is a welding power supply, 2 is a two-terminal variable constant current controller provided in a remote control device 3, 4 is a welding torch, 5 is a welding base material, 6 and 7 are welding cables, and 8 indicates the control signal cable.

As shown in the figure, the remote control device 3 has a portable configuration, and the (+) terminal of the welding power supply device 1 is connected to the remote control device 3 via a welding cable 6 that constitutes a part of the welding circuit. The control terminal (C) of the welding power supply device L is connected to the input terminal (b) of a two-terminal variable constant current controller 2 provided within the control signal cable 8 (the l-core cable is shown in the example). The output terminal (a) of the two-terminal variable constant current controller 2 is connected to the output terminal (a) of the two-terminal variable constant current controller 2 via a

The (-) terminal of the welding power supply l is connected to the welding cable 7.
It is connected to the base material 5 via.

On the other hand, inside the remote control device 3, there is a two-terminal variable constant 'r'.
! In addition to the i-flow controller 2, welding wire feeding means includes a welding wire 31 wound around a wire reel 30, a wire feeding roll 32 for feeding out the welding wire 31, a wire feeding motor 33, and a motor speed regulator. has been established.

FIG. 2 shows the circuit configuration of the welding power supply device 1 and the two-terminal type variable constant current controller 2.

The part surrounded by one point txm is the circuit configuration of the welding power supply device 1 excluding the circuit configuration on the (-) terminal side, and the part surrounded by the one-dot chain line 2 is the circuit configuration of the two-terminal variable constant current controller. The circuit configuration is shown.

The double-ended variable constant current controller 2 is a source type constant current controller in which a constant current diode CHD is provided on the base side of a PNP transistor Tr, and a Zener diode ZD and a temperature compensation diode D3 are provided between the emitter and base. The output current is varied by changing the resistance value of the resistor R12 that constitutes the current regulator 21. Furthermore, a torch switch TS is provided on the collector side of the transistor Tr.

On the other hand, in the welding power supply l, a welding power supply drive circuit 9 is provided.
, an output level control circuit 10 is provided, the first power supply circuit is used as a common power supply for the two-terminal variable constant current circuit 2 and the welding power supply device drive circuit 9, and the second power supply circuit is used to drive the output level control circuit 10. It is used as a power source.

Here, the welding power supply device drive circuit 9 operates the relay RL provided on the first power supply circuit side by the output current from the two-terminal variable constant current controller 2, opens the contact RL, and turns on the welding power source. Drive device l.

In the embodiment, a photocoupler Phc L connected to the control terminal (C) of the welding power source 1 is driven, and the welding power source 1 is driven by activating the relay RL.

To explain this operation based on an example, when the torch and inch TS are open, the output current of the two-terminal variable constant current controller 2 becomes a constant small current - flowing through the constant current diode CHD. At this small current I3, Ph
Unable to drive c l.

However, when the torch switch TS is closed, the output current of the two-terminal variable constant current controller 2 is changed to the constant current diode CR.
Current flowing through D1. and the current ■ flowing through the transistor Tr. and increases dramatically.

Then, the photocoupler Phcl is driven, drives the relay RL, closes its contact RL, and drives the welding power supply device 1. Here, the resistor RIO connected in parallel to the light emitting diode constituting the photocoupler Phcl is connected to the photocoupler P
This is a threshold setting resistor that sets the signal level for driving hcl.

Note that the first power supply circuit connects the commercial AC power supply e to the transformer T.
The extracted voltage is used as a DC power source through a full-wave rectifier circuit SR1 and a smoothing capacitor C1, and the second power supply circuit is a DC power source that drives the output level controller 10.

Further, in the embodiment, the output level control circuit 10 is provided on the output side of the welding power supply device drive circuit 9 via a photocoupler Phc2, and is configured using an operational amplifier OPI.
A /V conversion circuit 101 and a level shift circuit 102 configured using an operational amplifier OP2 are connected in series.

The f/V conversion circuit 101 is configured to e.g.
l.

The configuration is such that the output signal of the differential amplifier 101a provided with Pch3 is amplified by the operational amplifier OP1, and the photocoupler P
hc2 is used to convert the output current of the two-terminal variable constant current controller 2 into a voltage signal, and the output signal of the photocoupler 02 is varied by the output signal of the operational amplifier OPI.

The level shift circuit 102 constitutes an additive inverting amplifier using an operational amplifier OP2, and the T/V conversion circuit 10
Adding the output signal of 1 and the signal from the power supply Vcc2,
The level shift amount is determined by the resistor R3 provided on the power supply VCC2 side.
It can be set by

The output voltage V of this level shift circuit 102 is directly sent to a welding output circuit (not shown) as a reference voltage of the control system, and the output supplied from the welding power supply device 1 to the welding load is variably controlled.

Figure 3 shows the output current of the two-terminal variable constant current controller 2! .

The relationship between and the output voltage V of the output level control circuit is shown together with the ON state of the torch switch.

The connection configuration (polarity) between the welding power supply device and the welding part in the arc welding machine of the present invention is not limited to the above embodiment Connection configuration is possible.

In addition, as an input for electrically isolating the first power supply circuit and the second power supply circuit, it is also possible to use an isolating amplifier A in addition to a photocoupler, and the current circuit configuration diagram can be As shown in the figure.

Furthermore, in the above embodiment, the 2i variable constant current controller 2
One of the two terminals is connected to one terminal of the welding power supply device 1 via a welding cable 6 that constitutes a part of the welding circuit, and the other terminal is connected to one terminal of the welding power supply device 1 via a one-core control cable 8. Although a configuration connected to the control terminal C has been shown as an example, the present invention is not limited to this, and FIGS.
As shown in FIG. 10, a two-terminal variable constant current controller 2
The control cables 81 and 82 each having one core are connected to the control terminal C2 (two-terminal connector) of the welding power source 1, resulting in a total of two-core control signal cables 81 and 82.
2 terminal type variable constant current controller 2 and welding power supply device 1.
A configuration in which they are connected by a core control signal cable may also be used.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of the arc welding machine of the present invention, Fig. 2 is a configuration diagram of the electric circuit of the welding power supply device and remote control device, and Fig. 3 is the output 11 flows and outputs of the output regulator. A diagram showing the relationship between the voltage output of the level controller, Figures 4 to 7 are connection configuration diagrams of wiring examples in the arc welding machine of the present invention, and Figure 8 is a diagram of the output level control circuit. Figure 9 is a diagram showing the wiring configuration of another example of the arc welding machine of the present invention, and Figure 10 is a diagram showing the wiring configuration of the two-terminal variable constant current controller and welding power supply device corresponding to Figure 9. FIG. 11, a diagram showing the wiring configuration, is a configuration diagram of a conventionally known arc welding machine. (Explanation of symbols) In the figure, 1 is a welding power supply device, 2 is a two-terminal variable constant current controller, 3 is a remote control device, 4 is a welding torch, 5 is a welding base material, 6.7 is a welding cable, 8 .81 and 82 are control signal cables, 9 is a welding power supply drive circuit, and IO is an output level control circuit, respectively. Patent Applicant Osaka Electric Co., Ltd. Agent Patent Attorney Hiroyuki Gyudon Figure 4 Figure 6 Figure 5 Figure 7 Figure 8 Figure 3 Figure 11

Claims (1)

[Scope of Claims] (1) In an arc welding machine equipped with a remote control device configured to perform arc welding by remotely controlling the output supplied to a welding load from a welding power source, a , a two-terminal variable constant current controller is provided, and the welding power supply includes a welding power source that drives the welding power supply when the output current of the two-terminal variable constant current controller reaches a predetermined level or higher. An arc welding machine characterized by being provided with a device drive circuit and an output level control circuit that varies the control output of the welding power supply device according to the level value of the output current from the two-terminal type variable constant current controller. . (2) The welding power supply drive circuit uses a first power supply circuit provided in the welding power supply as a driving power source, and the output level control circuit drives a second power supply circuit provided in the welding power supply. 2. The arc welding machine according to claim 1, wherein the two drive circuits and the output level control circuit are electrically isolated from each other. (3) The remote control device includes a torch switch that turns on and off the welding power supply device, and when this switch is turned on, the output current of the two-terminal variable constant current circuit is dramatically increased to perform the welding. The arc welding machine according to claim 1 or 2, characterized in that the arc welding machine is adapted to drive a power supply device. (4) The output level control circuit is connected to the welding power supply drive circuit in an electrically insulated manner via a photocoupler, and the output level control circuit is connected to the welding power supply drive circuit in an electrically insulated manner, and The arc welding machine according to claim 1, 2, or 3, wherein the arc welding machine is configured to vary the control output of the welding power supply device by operation. (5) Claim 1 or 2, characterized in that the output level control circuit is connected to the welding power supply drive circuit via a voltage type isolation amplifier.
The arc welding machine according to item 1 or 3 or 4. (6) The output level control circuit converts the output current from the two-terminal variable constant current controller into a voltage signal.
Claim 1, 2, or 3 comprises a conversion circuit and a level shift circuit that outputs a voltage control signal obtained by shifting the output voltage of the I/V conversion circuit by a predetermined level.
The arc welding machine according to item 4 or 5. (7) Claim 1 or 2 or 3, wherein the two-terminal variable constant current controller and the control terminal of the welding power supply device are connected via a two-core control signal cable. The arc welding machine according to item 1 or 4 or 5 or 6. (8) One terminal of the two-terminal variable constant current controller is
It is connected to one terminal of the welding power supply device via a welding cable that forms part of the welding circuit, and the other terminal is
Claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that the core is connected to a control terminal of a welding power source via a control signal cable. The arc welding machine described in.