JPH0142796B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding output condition adjusting device that adjusts welding output conditions such as welding current and welding voltage (adjusts output switching).

Conventionally, when adjusting welding output conditions such as welding current and welding voltage by remote control, a remote control device 3 is connected to a welding power supply device 1 via a remote control cable 2, as shown in FIG. This was done by changing the value of the variable resistor of the remote control device 3. In FIG. 1, 4 is a welding torch, 5 is a feeder for feeding a welding wire to the welding torch 4, 6 is a feeder cable, and 7 is a welding base material.

By the way, in actual welding sites where large structures are handled, such as in the shipbuilding industry, work locations are frequently moved, and as a result, it is necessary to carry a welding torch, feeder, and remote control device at the same time. Carrying the equipment was a very troublesome task.

In order to eliminate this inconvenience, as shown in Fig. 2, a small variable resistor 8 is built into the welding torch 4 to make it a welding torch equipped with a remote control device, and the welding torch 4 is connected to the remote control cable 2 for welding. It is possible to integrate the cable 6a that connects the torch switch 9 to the welding torch 4 with the feeder cable that has the power cable 6b, but the welding torch 4 becomes incompatible and the welding torch becomes very expensive. In addition, the degree of occurrence of failure becomes large, which becomes a big problem for welding torches that are highly consumable items.

The present invention solves these problems,
This allows the welding operator to adjust the welding output conditions by hand without special processing on a special remote control device or welding torch.

In the present invention, the output conditions are changed by repeatedly turning on and off the torch switch, which is a push button switch for opening and closing the output of the welding power supply device, intermittently in a short period of time. This will be explained using the drawings of FIGS. 3 to 8 showing examples of the present invention.

FIG. 3 shows a block circuit of a welding output condition adjusting device according to an embodiment of the present invention. In FIG. 3, reference numeral 10 indicates an output switching relay of the welding power supply device, and reference numeral 11 indicates a relay of this output switching relay 10. A driving transistor, 12 a DC power supply, and 13 a push button switch for opening and closing the output of the welding power supply device, which is provided in the welding torch as a torch switch.

Here, the signal from the push button switch 13 for output opening/closing, which is in the hand of the welding worker, is input to the gate circuit 14, and in this gate circuit 14, the push button switch 13 is input to the gate circuit 14.
It is determined from the open/closed state of the push button switch 13 whether the signal from the push button switch 13 is a signal to start welding or a signal to switch output conditions of the welding machine. When switching the welding output conditions, a plurality of pulses from the gate circuit 14 are applied to the zero pulse exclusion circuit 15 and the first push button switch 13 is pressed.
signals are excluded. That is, when the signal of the push button switch 13 is inputted to the zero pulse exclusion circuit 15 n times, the first pulse is excluded and the n-1 pulse is inputted to the counting circuit 16. At this time, the reset circuit 17 generates a minute pulse from the rising edge of the second pulse, and outputs the pulse to the count circuit 16.
The reset signal is obtained. The signal from the count circuit 16 is input to the output switching circuit 18, and the welding output condition can be selected based on the number of times the push button switch 13 is pressed within a certain period of time.

On the other hand, during welding, after a certain period of time after the push button switch 13 is pressed, the output of the gate circuit 14 becomes high level, the transistor 11 is turned on, and the output switching relay 10 is operated.

As described above, according to this embodiment, the welding output conditions can be adjusted using the push button switch 13 for opening and closing the welding output. This is shown in time charts as shown in FIGS. 4 and 5. Note that in FIGS. 4 and 5, T ₀ is the delay time of the gate circuit 14. That is, if the next pulse is input within the time T ₀ , it is regarded as a welding output condition switching signal, and a pulse that lasts longer than the time T ₀ is regarded as a welding start signal. this
The time T ₀ is empirically set to a small value of about 0.3 seconds to 1 second.

Next, a specific circuit of the welding condition adjusting device of the present invention will be explained.

FIG. 6 shows an embodiment of the gate circuit 14 which is a signal discrimination circuit. In FIG. 6, 19 is a time limit setting resistor, 20 is a time limit setting capacitor, 21 is a monostable multivibrator, and 22 and 23 are AND gates. be.

In FIG. 6, the pulses that are repeated within the delay time T ₀ set by the monostable multivibrator 21 go out as an output, and if the pulse continues for more than the time T ₀ , the transistor 11 is activated and the welding machine The output switching relay 10 closes.

FIG. 7 shows an embodiment of the zero pulse exclusion circuit 15 and the reset circuit 17, and in FIG.
5 is a JK flip-flop, 26 and 27 are AND gates, 28 and 29 are inverters, 30 is a resistor, 3
1 is a capacitor.

In this circuit, the first pulse generated by pressing the push button switch 13 for the first time is generated by the two JK flip-flops 24 and 25 and the two JK flip-flops 24 and 25.
The pulses are excluded by AND gates 26 and 27, and the second and subsequent consecutive pulses are output. At this time, take out the second pulse rise and connect the inverters 28, 29, resistor 30, capacitor 31
In addition to the circuit for obtaining narrow pulses, a reset signal for the count circuit 16 is obtained.

Figure 8 shows the count circuit 16 and output switching circuit 18.
8, 32 is a BCD counter, 33 is a decoder, 34, 35, and 36 are analog switches, and 37, 38, and 39 are variable resistors as welding output condition regulators. The pulse generated by the push button switch 13 is sent to the BCD counter 3.
2, once it is input, it is converted to BCD code,
It goes out as output. The output from this BCD counter 32 is received by a decoder 33, and analog switches 34, 35, and 36 corresponding to the input pulse are made conductive. This analog switch 34, 35,
36 is a variable resistor 37, 3 for adjusting the output of the welding machine.
A variable resistor 37 for adjusting the output of the welding machine, which is connected to the analog switches 34, 35, and 36 that are in operation because it is connected to the contacts 8 and 39;
Welding machine output adjustment signals determined by 38 and 39 are applied to the control circuit of the welding power supply device.

As described above, according to the welding output condition adjusting device according to the present invention, the welding output conditions such as welding current and welding voltage of the welding power supply device are adjusted by the number of times the push button switch for opening and closing the output is turned on. You can get an effect like this.

(1) Welding output conditions can be adjusted using only the welding torch without adding a special remote control device.

(2) Since a remote control device is not required, it is easier to move the welding work place, and it is also easier to adjust the welding output conditions in work places where climbing is required.
Able to perform highly safe work.

(3) If the welding workplace is several tens of meters away from the welding power supply, using a remote control device with a long cable often caused failures due to cable breaks, but these problems will no longer occur. At the same time, it is possible to reduce the price.

As described above, according to the present invention, reliability in semi-automatic welding of large structures in the shipbuilding industry, bridge industry, etc. can be increased.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a conventional device for adjusting welding output conditions by remote control; Fig. 2 is a perspective view showing a welding torch of a welding output condition adjusting device for manually adjusting welding output conditions; Fig. 3 is a block circuit diagram of a welding output condition adjusting device according to an embodiment of the present invention, Fig. 4 is a time chart when setting welding output conditions of the same device, Fig. 5 is a time chart when the same device is welding, and Fig. 6 is a time chart when the same device is welding. The figure is a block circuit diagram showing one embodiment of the gate circuit of the same device, FIG. 7 is a block circuit diagram showing one embodiment of the zero pulse exclusion circuit and reset circuit of the same device, and FIG. FIG. 2 is a block circuit diagram showing one embodiment of an output switching circuit. 10... Output opening/closing relay, 13... Push button switch, 14... Gate circuit, 15... Zero pulse exclusion circuit, 16... Count circuit, 18... Output switching circuit, 37, 38, 39... Variable resistor .

Claims (1)

[Claims] 1. A torch switch provided on a welding torch for opening and closing the output of the welding power supply device, and when the time limit interval of this torch switch is longer than a certain time period, it is processed as an output opening/closing command signal of the welding power supply device. and a signal discrimination circuit that processes the signal as a welding output condition adjustment signal when the value is smaller than a certain time period; a control circuit unit that counts the number of times the torch switch is turned on intermittently to determine the welding output condition; A welding output condition adjusting device comprising a plurality of welding output condition adjusters which are selected according to the above conditions and whose welding output conditions can be adjusted.