JPH0349805Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to a remote control device for an engine-driven DC arc welding machine, and in particular, it is capable of automatically selecting appropriate welding conditions from a distance in welding operations under various welding conditions. The present invention relates to a remote control device.

[Prior art]

When performing manual welding using a conventional engine-driven DC arc welding machine, it is necessary to select the appropriate welding current and welding rod depending on the plate thickness of the workpiece, groove conditions, and welding position. It's on.

In this case, if the welding machine is equipped with a voltmeter and an ammeter, using the welding voltage and welding current as a standard, even if you are not an experienced worker, as long as you have a welding manual, you can perform proper welding work. It was possible to do this. However, in the case of remote control, if the remote control device is equipped with a voltmeter and an ammeter, there will be problems with vibration and damage, so most devices are equipped with only a variable resistor. Therefore, when welding is carried out by remote control, the welding current is determined by intuition, and the current situation is that the finish varies depending on the operator, and that good welding results cannot be obtained.

[Problem that the invention attempts to solve]

The present invention has been devised in view of the above drawbacks, and provides a remote control device that automatically sets welding current by simple operation from a distance.

[Means for solving problems]

A remote control device that controls a DC voltage applied to an excitation coil via a single-phase mixed bridge rectifier in which a thyristor and a diode are bridge-connected, the device comprising a pulse generator that controls the phase of the thyristor, and a pulse generator of the pulse generator. The machine has a single-axis multiple variable resistor that finely adjusts the conduction angle of the thyristor by changing the generation phase, and a circuit that selects the welding current depending on the welding conditions, and a changeover switch that sets the welding conditions. It is characterized by being equipped so that it can be extended from the main body to the welding site.

[Effect]

With the above configuration, when welding conditions such as using a welding rod of a predetermined diameter are set using a changeover switch installed in a device extending from the machine body to the work welding site, a uniaxial multiple variable resistor is formed. A desired variable resistor is selected from among the plurality of variable resistors, and the selected variable resistor is used to change the pulse phase of the pulse generator applied to the excitation coil of the welding DC generator. Therefore, by setting the changeover switch provided in the remote control device to the value of the diameter of the welding rod to be used, the welding conditions for the set welding rod can be automatically satisfied.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of an embodiment of the present invention.
In the figure, 1 is an AC 110V power supply, and 2 is a single-phase mixed bridge rectifier circuit formed from thyristors 3a, 3b and diodes 4a, 4b. The output of the rectifier circuit 2 is applied to an excitation coil 6 of a DC generator 5, and the output of the DC generator 5 is connected to a welding rod 7 and a welding base material 8. 9 is a thyristor 3a,
A pulse generator that applies a pulse to the gate of 3b,
Lead wires 10a and 10b are input wires of the power supply for the pulse generator. Reference numeral 11 denotes a single-axis multiple variable resistor for changing the pulse phase of the pulse generator 9, and includes variable resistors 12a to 12f and a motor for selecting these variable resistors. Reference numeral 14 denotes a remote control device, which has a welding rod selection switch 14a, and in FIG. 1, five types can be selected. Reference numeral 15 denotes a welding condition setting device, which includes a welding current setting device corresponding to each type of welding rod, and a calculator for calculating the set welding current and the selected welding current signal sent from the changeover switch 14a. The motor 13 is rotated according to the calculated signal, and the selector switch 1 is selected from among the variable resistors 12a to 12f.
A variable resistor suitable for the selected welding rod 4a is provided with means for connecting the selected variable resistor to the pulse generator 9, and is built into the machine body.

Next, the effect will be explained.

When starting welding work, extend the remote control device 14 from the machine body to the work site using a cable,
A welding rod with a desired diameter is selected from among various welding rods of 6.0 and 8.0 mmφ and attached to the holder, and then the welding rod selection switch 14a in the remote control device 14 is set to the selected value. The welding condition setting device 15 receives the selection signal from the changeover switch 14a, compares it with the setting signals of various welding current setting devices corresponding to the welding rod diameter, and rotates the motor 12 according to the calculated value to perform switching. The switch 14a selects variable resistors 12a to 1 suitable for the welding rod.
Select from 2f. This selected variable resistor changes the phase of the pulse generated by the pulse generator 9 and changes the conduction angle of the thyristors 3a and 3b of the rectifier 2.

FIG. 2 a, b, c, d are the thyristors 3a,
3b is an explanatory diagram of a change in the conduction angle of FIG. In the same figure, βa, βb, βc...βf are each thyristor 3a, 3b.
αa, αb, αc, ...αf indicate the firing end position. The ignition end position is determined by the resistance values of the variable resistors 12a to 12f shown in FIG. Further, the amount of change in the resistance value of the variable resistor 12a determines the conduction phase width of the thyristors 3a and 3b between βa and αa in FIG. 2a. Variable resistor 12b~
12f similarly determines the conduction phase width of the thyristors 3a and 3b.

The thyristors 3a and 3b change the excitation current of the generator 5 by changing the conduction phase width, and the generator 5 sends out a welding current corresponding to the selected welding rod 7.

[Effect of idea]

According to this invention, the welding operator simply sets the welding condition setting switch to the appropriate position from a distance, and the rest is automatically set to the appropriate welding conditions, eliminating the need for the operator to adjust conditions based on intuition. No longer needed.
Furthermore, it is possible to prevent the tendency of excessive current settings based on operator judgment.

In this way, by automatically setting appropriate welding conditions, welding defects such as undercuts due to excessive current, insufficient penetration due to insufficient current, and overlaps are eliminated, welding quality is improved, and welding is improved. It has the effect of improving efficiency.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an embodiment of the present invention, and Fig. 2 is a circuit diagram of an embodiment of the present invention.
It is a voltage control waveform of the example shown in the figure. 1... AC power supply, 2... Single phase mixed bridge rectifier circuit, 3a, 3b... Thyristor, 4a, 4b...
... Diode, 5 ... Generator, 6 ... Excitation coil, 7 ... Welding rod, 8 ... Welding base material, 9 ... Pulse generator, 11 ... Single-axis multiple variable resistor, 12a
~12f...variable resistor, 14...remote control device, 14a...changeover switch, 15...
...Welding condition setting device.

Claims (1)

[Scope of utility model registration request] A remote control device that controls a DC voltage applied to an excitation coil via a single-phase mixed bridge in which a thyristor and a diode are bridge-connected, the device comprising a pulse generator that controls the phase of the thyristor, and a pulse generator for the pulse generator. A single-axis multiple variable resistor that finely adjusts the conduction angle of the thyristor by changing the phase, and a circuit that selects the welding current according to the welding conditions are built into the machine body, and a changeover switch for setting the welding conditions is installed from the machine body. A remote control device that can be extended to the welding site.