JPS61111771A - Arc welder - Google Patents

Abstract

PURPOSE:To make a remote controller and an extension cable unnecessary, and to improve the mobility and the work efficiency by constituting a titled arc welder so that a remote control of an output of the welder is executed by a model of a welding work by using a signal line for opening and closing a welding output. CONSTITUTION:When a welding output opening and closing operation switch 11 is turned on, a voltage is generated in an output of an operational amplifier 18, and a resistance variation quantity of a variable resistor 10 for adjusting the welding output is changed to a voltage and can be fetched at a welding power source side. As a result, in accordance with the fetched output voltage of the operational amplifier, a welding current and a welding voltage can be brought to a remote control operational. Also, when the welding output opening and closing operation switch 11 is turned on, an output of an operational amplifier 19 becomes a level which is enough for turning on a transistor 20, the transistor 20 is turned on, a welding output opening and closing relay 21 is driven, and the welding output is started.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an arc welding machine that remotely controls the adjustment of welding voltage and welding current at the hands of a welding operator.

BACKGROUND ART When performing arc welding, it is necessary to change welding conditions, that is, welding voltage and welding current, depending on the welding posture and the shape of the object to be welded. When welding large structures such as shipbuilding and steel frames, the welder and the welding power source are often separated, and the welding conditions are adjusted by the welder using a remote controller. .

In such a conventional remote controller, as shown in FIG. 5, a variable resistor 2 for adjusting welding conditions is housed in a strong case 1, and a multicore cabtire cable 3 is used.

Further, the welding torch in the hand of a welding worker has a built-in operation switch 4 for opening and closing the welding output, as shown in FIG. 6, and controls starting and stopping of the welding output.

These conventional remote controllers are shown in FIGS. 7 and 8.

The electric circuit diagram of the welding torch section is shown. In the figure, 5 is a signal line of the cabtyre cable.

Problems to be Solved by the Invention 3. In the past, a large number of extension cables were stretched between the welding power source and the welding operator, which impeded the mobility of the welding operation. Furthermore, the large number of cable cores in the extension cable causes problems such as disconnection.

The present invention aims to reduce the number of extension cables and to reduce the number of cable cores included in the extension cable.

Means for Solving the Problem In order to solve this problem, the present invention includes a voltage variable element connected in series to the welding output opening/closing switch, and a welding power source that determines the open/closed state of the welding output opening/closing operation switch. A circuit for determining the voltage value of the voltage variable element, and a circuit for setting the welding output condition based on the detected voltage value are provided.

Function: Using two wires connected to the welding output opening/closing operation switch at hand of the welding worker, attach an impedance element or a constant voltage diode and a changeover switch in series to the welding output opening/closing operation switch. The impedance value or voltage value between the two wires is detected on the welding power source side, and the welding power source is started/stopped, the output conditions are adjusted, and the wire feeding speed is adjusted. , the number of extension cables can be reduced, and the number of cable cores in the extension cable can still be greatly reduced.

Embodiment In an embodiment of the present invention, a system will be described in which a variable resistor is used as an impedance element to continuously vary the output.

A circuit according to an embodiment of the present invention is shown in FIGS. 1 and 2.

FIG. 1 is a wiring diagram of electrical components placed in or near a welding torch or wire feeding device;
The figure is an electric circuit diagram arranged at or near the welding power source.

10 is a variable resistor for adjusting welding output, 11 is an operation switch for opening and closing welding output, 12 is a constant voltage power source, 13, 14, 15
, 16.17 is a resistor, 18°19 is an operational amplifier, 20
is a signal line that connects the relay drive transistor 5 vane and the welding power source.

The operation of the embodiment of the present invention will be described below. When this welding output opening/closing operation switch 11 is turned on, the operational amplifier 1
The following voltage is generated at the output of 8.

However, v0 = output voltage of operational amplifier 6 in Figure 2 VR1 =
Resistance value v4 of the variable resistor for adjusting welding output conditions in 1 in Fig. 1 = Resistance value E of the resistor in 4 in Fig. 2 = Potential of the constant voltage power supply in 3 in Fig. 2, that is, the variable resistor for adjusting the welding output The amount of change in resistance of 1o can be converted into voltage and taken out on the welding power source side.

And as a result of this, the output voltage of the operational amplifier taken out■. The welding current (wire feeding speed) and welding voltage (welding power output) can be adjusted remotely. It's a moat, the output of the operational amplifier 19 is the welding output opening/closing operation switch 11.
When the voltage is turned on, the level becomes sufficient to turn on the transistor 20, the transistor 20 is turned on, the welding output switching relay 21 is driven, and the welding output is activated.

Further, when the welding output opening/closing operation switch 11 is not turned on, the potential of the signal line B is at zero level, no voltage is generated at the output of the operational amplifier 19, and neither the transistor 20 nor the relay 21 operates. As a result, it becomes possible to remotely control the adjustment of the welding current and welding voltage and the start and stop of welding at the same time.

As described above, in the present invention, the welding output opening/closing operation switch and the welding output condition adjustment variable resistor are connected in series, and the welding power supply section includes a circuit for determining the ON state of the welding output opening/closing operation switch, and a circuit for determining the ON state of the welding output opening/closing operation switch, and the welding output A circuit is provided to convert the resistance of the variable resistor for condition adjustment into voltage, and two signal lines are used to determine the on state of the welding output opening/closing operation switch and to start and stop the welding output. , it is possible to remotely control the output of the welding machine by setting the variable resistor for adjusting the welding output conditions.

In the explanation of the above embodiment, the output condition of the welding machine is remotely controlled by converting the resistance of the variable resistor connected in series to the welding output opening/closing operation switch into voltage.
As shown in the figure, the voltage across the variable resistor may be taken out directly.

In FIG. 3, 10 is a variable resistor for adjusting welding output conditions, 11 is an operation switch for opening and closing the welding output, 22 is a resistor, and 23 is a constant voltage power source.

When the welding output opening/closing operation switch 11 is closed, the signal line A
, H between the two lines is a value obtained by dividing the constant voltage E by the variable resistor 10 and the resistor 22. This ■. It is also possible to adjust the welding output conditions using the voltage.

Further, the same applies when a transistor, a variable capacitor, etc. other than a variable resistor is used as an impedance element.

In the above description of the embodiment, we have explained the method of connecting a variable resistor in series with the welding output opening/closing operation switch to continuously vary the welding output conditions. The same function can be achieved by using the changeover switch 25 of the constant voltage diode 24 instead of the resistor.

In the method shown in Fig. 1, the n-th constant voltage diode 24
is selected and the welding output opening/closing operation switch 11 is turned on, a constant voltage diode 24 is connected between the signal lines A and B.
The voltage determined by In this embodiment, the output of the welding machine is set using this voltage, and the opening/closing state of the welding output opening/closing operation switch 11 is determined in the same manner as in the previous embodiment to start and stop the welding output.

As described above, even if a changeover switch and a constant voltage diode are used, it is possible to simultaneously remotely control the opening and closing of the welding output and the adjustment of the welding output conditions using two signal lines.

Effects of the Invention As described above, according to the present invention, the output of a welding machine can be remotely controlled using a signal line for opening and closing the welding output, without using a dedicated remote controller as in the conventional example. , which can be done at the hands of the welding operator, has the following advantages:

(1) It is lighter because a remote controller and extension cable are not required.

(2) Since there are fewer extension cables, mobility is improved when working while moving, and work efficiency is increased.

(3) Since there are fewer extension cables, there are fewer problems related to disconnection and contact.

[Brief explanation of the drawing]

FIGS. 1 and 2 are circuit diagrams of the electric parts of the welding torch of an arc welding machine according to an embodiment of the present invention, which are arranged near the wire feeding device, and FIG. 3 shows the welding output opening/closing operation switch and FIG. 4 is a circuit diagram showing a circuit for taking out the voltage value across the variable resistors connected in series, and is arranged near the welding torch or wire feeding device of an arc welding machine according to another embodiment of the present invention. The circuit diagrams of electrical parts, Figures 5 and 6 are perspective views showing the appearance of a conventional remote controller and a welding torch, respectively, and Figures 7 and 8 are Figures 5 and 6, respectively. It is a circuit diagram of the shown part. 1o... Variable resistor for welding output adjustment, 11. Operation switch for welding output opening/closing, 12... Constant voltage power supply, 13, 14.15, 16.17.・Resistor, 18.19... River ・Operational amplifier, 20...
Relay driving transistor, 21... Output switching relay, 24... Constant voltage diode, 26...
River... selector switch. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) A voltage variable element connected in series to the welding output opening/closing operation switch, a circuit in the welding power source that determines the open/closed state of the welding output opening/closing operation switch, and a circuit that detects the voltage value of the voltage variable element. and a circuit for setting welding output conditions based on the detected voltage value. (2) The arc welding machine according to claim 1, which uses a variable resistor as the voltage variable element. (3) The arc welding machine according to claim 1, which uses a plurality of constant voltage diodes and a changeover switch for selecting the constant voltage diodes as voltage variable elements.