JPS6064773A - Arc welding machine - Google Patents

Abstract

PURPOSE:To improve reliability to permit operation on a remote control box side when a remote control box is attached to a welding machine by changing over automatically setting of welding voltage, current, etc. to the remote control box side or the main unit side of the welding machine. CONSTITUTION:When a remote control box 15 is attached to a welding machine, a voltage is generated at both terminals of a resistor 16 and the voltage thereof is detected by an operational amplifier 17, by which the presence or absence of the remote control box is detected. A switch circuit 19 on the remote control side is closed by the output from the amplifier 17 and a set reference signal at the remote control box 15 is obtd. from a terminal 22. When the box 15 is not mounted, no voltage is generated at both terminals of the resistor 16 and therefore the output from the amplifier 17 is off and the output from an inverter 18 is an on signal. A switch circuit 21 on the main unit side is then turned on and the signal at the main unit 20 is selected. The set reference voltage is thus automatically obtd. according to the mounting and dismounting of the remote control box.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an arc welding machine, and more specifically, the present invention relates to an arc welding machine, and more specifically, a main unit panel that connects the voltage, current, etc. of a welding power source, and a remote control box (hereinafter referred to as a remote control box) connected to the main body panel. This relates to an arc welding machine that can be freely adjusted.

[Background of the invention]

In general, in arc welding machines, the torch is often extended to a position quite far from the welding power source, so
In many cases, a remote control box that varies the voltage and current depending on the quality of the base material, the welding location, etc. is extended to the tip of the torch and installed. In this case, the problem is that the values set in advance using the adjustment dial on the main unit are not reset even if the remote control box is fully connected and used. In other words, when a remote control box is connected, it is required that the setting values in the remote control box are completely given priority.

1 and 2 are diagrams for explaining the prior art, in which FIG. 1 is an overall view thereof, and FIG. 2 is a partial view illustrating another example.

In Fig. 1, 1 is a rectifier that converts all DC power from the commercial power supply, 2 is a switching circuit that converts the DC to high-frequency AC, 3 is a bath-connected transformer, 4 is a rectifier, 5 is a reactor, 6 is a current detector, 7 is the load to which the torch is connected. Further, the current detector 6 is amplified by an amplifier 8, and its output is inputted to one input terminal of a differential amplifier 9. The output of the differential amplifier 9 is input to the drive circuit IO, and the switching circuit 2 is controlled by the output. 11 is a regulator attached to the main body/4' wall of the welding machine, and 12 is a remote control box, which has regulators for setting welding current, voltage, etc., and outputs a differential amplifier 90 reference voltage. Adjuster 1
A switch 13 is inserted between the remote control BOX 12 and the remote controller BOX 12 to select one of the outputs.When setting the reference using the regulator 11 attached to the main body panel, a switch circuit is inserted. 13 is left in the state shown in the figure, and when the remote control box 12 is connected, it is done by switching all of the switch circuits 13.

The circuit configuration shown in FIG. 1 not only requires a changeover switch on the panel of the main body, but is also cumbersome to operate and sometimes forgets to switch, resulting in low reliability.

In addition, a short-circuit terminal is provided in the remote control box, and when the remote control box connector is inserted, the subsequent circuits become conductive, and the signal operates a relay or transistor to obtain a reference signal for either the main body panel or the remote control box. There are five methods for identifying the wire, but these methods require an extra number of connector terminals and cable cores, resulting in high costs.

[Purpose of the invention]

The purpose of the present invention is to solve the problems of the prior art described above,
To provide an arc welding machine equipped with a remote control BOX'i which is inexpensive and allows the remote control BOX side to be reliably operated preferentially when the remote control BOX is connected.

[Summary of the invention]

The present invention provides an arc welding machine comprising an arc welding machine main body and a remote control box connected to the main body and provided with setting means for welding voltage, current, etc. similar to the arc welding machine main body. A circuit that detects the signal generated by connecting a remote control box, a circuit that completely determines whether or not a remote control box is attached based on the output from the detection circuit, and a circuit that controls the welding voltage, current, etc. based on the output of the determination circuit. It is characterized by a switch circuit that automatically switches the reference setting circuit between the remote control box side and the welding machine main body side.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4.

In order to simplify the explanation, FIG. 2 shows only the area around the connection circuit of the remote control box of the arc welding machine, and 15 is the remote control box, and a resistor 16 is connected in series. This remote control BOX15. One voltage Vo is applied to the resistor 16. 17 is an operational amplifier that compares and detects the voltage across the resistor 16, and an inverter 18 . A switch circuit 19 is provided.

Further, the output set by the current and voltage setting devices provided on the panel surface of the main body is obtained at the terminal 22 via the switch circuit 2.

According to the same configuration, when the remote control box (resistor) 15 is attached, a voltage is generated across the resistor 16.

By detecting this voltage with the operational amplifier 17, the presence or absence of the remote control box can be detected. That is, the output of the operational amplifier 17 closes the switch circuit 19 on the remote control side,
A setting reference signal for the remote control box 15 is obtained from the terminal 22.

Also, if remote control BOX 15 is not installed, @
Since no voltage is generated across the resistor 16, the output of the operational amplifier 17 is off (1L" level) and the inverter 18
The output becomes an on (S%H level) signal, which turns on the switch circuit 2 on the main body side, and selects the signal in the main body (setting reference voltage generator) 20. In other words, the remote control BOX
15 is connected or not depending on the output of the operational amplifier 17.

Since it is turned off and the corresponding reference voltage is output, the set reference voltage can be automatically obtained in response to attachment or detachment of the remote control box 15.

Note that if a resistor with a predetermined value is not installed in the remote control box 15, a positive voltage may be generated in the resistor 16 due to circuit leakage current, noise, etc., and the amplifier 17 may operate. In order to prevent this, as shown in Figure 3, a small current is passed through a resistor n having a high resistance value from a voltage 1 (higher than the voltage vo), and when the remote control box 15 is not connected, a reverse voltage is generated across the resistor 16. to ensure reliable operation of the amplifier 17.

In the above embodiment, a case was described in which the voltage of the resistor 16 was detected, but as shown in FIG. By detecting the current when the remote control box 15 is connected, the switch circuit 21 is closed by the output of the amplifier, and the full set value of the remote control box 15 is output. In FIG. 5, 26 is a reference voltage setter which becomes one input of the operational amplifier B.

〔Effect of the invention〕

As is clear from the above-described embodiments, according to the present invention, it is possible to automatically switch between inputting set values on the main body panel and inputting set values on the remote control box, and the reliability thereof is extremely high.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram for explaining a conventional device, FIGS. 2 to 4 are diagrams for explaining the present invention, and FIG. 2 shows an example of the connection between the remote control box and the main body. FIG. 3 and FIG. 4 are diagrams showing other embodiments. 15...Remote control box, 16.23...Resistor, 1
7, 25... obeang, 18... inverter,
19, 2]...switch circuit, addition...main body, 22
... Output terminal, Sae ... Current detector, ... Reference voltage setter. Representative Patent Attorney Tadashi Akimoto Diagram 2 Part 4

Claims (1)

[Claims] In an arc welding machine comprising an arc welding machine main body and a remote control box connected to the main body and provided with setting means for welding voltage, current, etc. similar to the arc welding machine main body, connecting the remote control box. A circuit that detects the signal generated by the detection circuit, a circuit that determines whether or not a rotor control box is attached based on the output from the detection circuit, and a circuit that controls the welding voltage, current, etc. based on the output of the determination circuit. This arc welding machine is characterized in that it is equipped with a switch circuit that automatically switches the reference setting circuit between the remote control box side and the welding machine main body side.