JPH04162965A - Remote control method and device for engine welding machine - Google Patents

Abstract

PURPOSE:To facilitate the control of a current controller by a coded high-frequency signal for remote control by bringing the output end of a welding cable superposed with the high frequency for remote control into contact with base metals for welding by as much as a set number of times via a noise filter. CONSTITUTION:The contactor of a holder 29 or the 1st contact terminal of a touch sensor A is first brought into contact with the base material 31 by the set number of times as to the engine start in the case of changing over of a changing over circuit 20 for one person and two persons to one person. The high-frequency signal for remote control outputted from a high-frequency oscillator 39 by this contact flows from the welding cable 33a as if the signal flows to a holder 20, the noise filter 44, the base metal 31 and the welding cable 33b. This signal is detected by a current transformer CT1 for signal detection and is inputted via a 1st amplifier 41 and an amplifier 43 for low level to a CPU. The prescribed processing operation is executed in the CPU.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a remote control method and apparatus for an engine welding machine that can remotely control the welding current of the engine welding machine using a welding cable.

"Prior Art" As conventional remote control methods and devices for this type of engine welding machine, those described in Japanese Utility Model Publication No. 31-1735 and Japanese Utility Model Publication No. 62-27331 have already been proposed. The one described in Utility Model Publication No. 31-1735 is
If you want to increase or decrease the welding current by using a portable impedance device equipped with multiple terminals with different impedances and a welding machine with a movable ring type structure, set the predetermined impedance between the holder and the base metal. Connect the terminals. When a current corresponding to this predetermined impedance flows through the output circuit, a relay corresponding to the current value is activated, and this relay operates to rotate the motor forward or reverse, moving the movable iron core of the welding machine and increasing the welding current. It is made to increase or decrease. On the other hand, in the method described in Japanese Utility Model Publication No. 62-27331, the welding current is increased or decreased depending on the welding time of the welding rod to the base material. That is, when increasing the welding current, the welding rod is welded to the base material for only 2 seconds, and the timer rotates the motor for a set time in response to the output voltage during this welding, increasing the welding current. If the welding rod is welded to the base material for α seconds, which is 2 seconds or more, the motor will reverse for α-2 seconds to reduce the welding current.
The method described in Publication No. 5 treats the impedance difference caused by the portable impedance device as a change in the current value flowing through the welding output circuit, and controls the welding current by operating a relay corresponding to this change value. , there are vibrations that can cause malfunctions, and engine welding machines cannot be used as is.In other words, the welding current can vary greatly depending on the welding conditions, and this fluctuation can cause the motor to malfunction and cause the welding current to be inadvertently reduced. Situations such as changes occur.

Furthermore, since the welding current is supplied from a commercial power source through the movable wire type welding machine, it cannot be used for an engine welding machine that has an automatic slowing device and adjusts the welding current with a thyristor.

On the other hand, the method described in Japanese Utility Model Publication No. 62-27331 increases or decreases the welding current depending on the welding time of the welding rod to the base metal, so there is no possibility that the welding rod will inadvertently weld to the base metal during welding. Often, this can be mistakenly taken as a signal to increase or decrease the welding current and drive the motor.
In this case as well, it seems to be a movable ring type (or movable iron core type) similar to the above, and there is a problem that this type of type cannot be applied as is to an engine welding machine.

Therefore, in view of the above circumstances, the present invention has been devised to provide a system that prevents a signal for controlling a welding current from being mistakenly identified as another welding current itself, ensures reliable control operation, and has a plurality of output circuits. In addition, it is possible to control the welding current independently for each output circuit, and by automatically adjusting it based on the value of the variable resistor for current setting that is set manually, the current can be predicted in advance. Set by variable resistance for setting,
A further object of the present invention is to provide a remote control method and apparatus for an engine welding machine, which provides the convenience of automatic adjustment to the optimum value.

"Means for Solving the Problem" The present invention has been made to achieve the above object, and in claim (1), in addition to the welding current, a high frequency signal for remote control is superimposed on the welding cable, The output end of the welding cable is brought into contact with the welding base material a set number of times through a noise filter to form a control code, and the remote control unit uses the coded high-frequency signal for remote control from this contact to increase or decrease the welding current. A remote control method for an engine welding machine, characterized in that the remote control method for an engine welding machine is characterized in that a plurality of welding outputs are transmitted to each welding cable by a high frequency signal for remote control, and a current controller is controlled by determining either The remote control unit distinguishes the coded high-frequency signal for remote control for each welding output circuit by superimposing it and contacting the output end of the welding cable with the base metal through a noise filter. Claim (1) characterized in that the current controller is independently controlled by
) is in the remote control method for an engine welding machine. In claim (3), the range in which the welding current can be controlled by the current controller is divided into a plurality of stages, and when the remote control unit receives an increase/decrease command by a high frequency signal for remote control, each time the remote control unit receives an increase/decrease command, A remote control method for an engine welding machine according to claim (1) or claim (2), characterized in that a current controller is controlled to increase or decrease the welding current step by step. Claim (4)
Then, the value set by the variable resistor for current setting is read into the remote control unit in advance, and when the remote control unit receives an increase/decrease command by the high frequency signal for remote control, the value set by the variable resistor for current setting is read in by the command from the remote control unit. The engine welding machine according to claim (1), claim (2), or claim (3), wherein the current controller increases or decreases the welding current based on the set value by the variable resistor. There is a remote control method for superimposing a high frequency signal for remote control on the welding cable.In claim (5), there is provided a high frequency oscillator for superimposing a high frequency signal for remote control on the welding cable, a noise filter connected to the output end of the welding cable, and a noise filter for superimposing a high frequency signal for remote control on the welding cable. A remote control unit that receives a high frequency signal for remote control encoded by the number of times the output end of the welding cable contacts the base metal through a noise filter and determines an increase or decrease in the welding current, and from the remote control unit. A remote control device for an engine welding machine is characterized by comprising a current controller that controls a welding current according to a command.

According to claim (6), there is provided a plurality of sets of welding output circuits, and each welding output circuit is provided with a noise filter, a remote control unit, and a current controller, respectively, according to claim (5). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the remote control device for an engine welding machine described in the following, an embodiment of the remote control method for an engine welding machine and the device according to the present invention will be described with reference to the drawings. 1st
In the figure, 1 is an engine, and 2 is a generator driven by the engine. A dynamo 3 and a starter 4 are attached to the engine 1, and the dynamo 3 charges a battery 6 via a regulator 5, and the starter 4 receives power from the battery 6 via a battery switch 7 and a starter switch 8. The method of starting the engine 1 by driving the engine 1 is the same as a well-known method. The starter switch 8 is used to manually switch between preheating, running, and stopping, but if the safety relay 4a is activated, the starter 4 will not start even if the switching operation is performed, and the emergency switch will not start while the engine 1 is running. When relay 9 is activated, stop relay 10 is activated to excite stop solenoid 11, thereby stopping engine l. The emergency relay 9 turns on the oil pressure switch 12 when the lubricating oil reaches an abnormal oil pressure, turns on the water temperature switch 13 when the cooling water temperature reaches an abnormal value, or turns on the pilot lamp 14 when an abnormality occurs in charging the battery 6. It operates when the light is turned on. The starter switch 8 supplies DC power from the battery 6 to the emergency relay 9, stop relay 10, pilot lamp 14, and other devices described below. Dynamo 3
If an abnormality occurs in the charging of the battery 6, the emergency relay 9 is activated via the charge indicator unit 15, and the pilot lamp 1 is activated.
4 is lit. A signal is supplied from a remote control unit 16 including a CPU to a circuit at each switching position of the starter switch 8. The remote control unit 16 is also configured to receive switching position information from a remote control/manual changeover switch 17. The generator 2 is connected to a first output terminal 21a via a first bridge circuit 18, a second bridge circuit 19, and a switching circuit 20 for one person and two inputs.
, 21b and second output terminals 22a, 22b, respectively. The first bridge circuit 18 and the second bridge circuit 19 are composed of diodes Re, , Re, and thyristors S CR+ , S CRt , where the thyristor SCR is the first current controller 23 and the thyristor SCR is the second current controller 23 . Each firing angle is controlled by a current controller 23.

The first current controller 23 is provided with a first current setting variable resistor V R+, and the second current controller 24 is provided with a second current setting variable resistor V Rt. The setting positions of the first current setting variable resistor VR and the second current setting variable resistor Rt are read into the remote control unit 16. The remote control unit 16 reads the first current setting variable resistance VR and the second current setting variable resistance VR.
.

The first current controller 23 and the second current controller 24 are respectively controlled based on the setting positions of the first current setting variable resistor VR and the second current setting variable resistor VR2 during remote control. Based on each read set value, the first current setting variable resistor VR and the second current setting variable resistor VR can be separated and freely controlled thereafter. The switching circuit 20 for one person and for two people includes a changeover switch SW that switches the outputs of the first bridge circuit 1 and the second bridge circuit 19 so that they can be used alone or in parallel. Output terminals 21a, 21b, 22a.

It consists of resistors R, , R2 inserted between 22b and 22b. When the changeover switch S W t is switched, the voltage drop across the resistor R2 becomes zero, so whether the remote control unit 16 is for one person or two people is detected based on the presence or absence of this voltage.

Furthermore, current smoothing actuators 25 and 26 are inserted between the output terminals 21a, 21b, 22a, and 22b and the first bridge circuit 18 and the second bridge circuit 19, respectively.

Welding cables 33a, 33b are connected to the output terminals 21a, 21b, 22a, 22b.

A holder 29.30 that removably holds a welding rod and a base material 31.32 are connected via 34a and 34b. The remote control unit 16 has a first remote control circuit 35 and a second remote control circuit 36, and the first remote control circuit 35 and the second remote control circuit 36 have diode circuits 37 and 38, respectively. Output terminals 21a, 21b via
, 22a.

It is connected to the 22b side. The first remote control circuit 35 and the second remote control circuit 36 have the same circuit configuration as shown in FIG. In FIG. 2, the diode circuits 37 and 38 of FIG.
It is shared with the bridge circuit 19 of. In other words, the first remote control circuit 35 and the second remote control circuit 36 are
A high frequency oscillator 39 whose oscillation operation is controlled by a high frequency oscillator 39 is provided, and a high frequency signal for remote control from the high frequency oscillator 39 passes through an isolation transformer 40 and is output from the generator 2 to the output terminal 21a.

21b, 22a, and 22b. It is also possible to share one high-frequency oscillator 39 with the first remote control circuit 35 and the second remote control circuit 36, in which case the high-frequency signal from one high-frequency oscillator 39 is branched, The first remote control circuit 35 and the second
The remote control circuit 36 and each isolation transformer 40 are supplied with the remote control circuit 36 . A signal detection current transformer C is connected to the line between the generator 2 and the first bridge circuit 18 and the second bridge circuit 19.
The signal detection current transformer CT is connected to the CPU via the noise filter 57, the first amplifier 41 and the high level amplifier 42, and the first amplifier 41 C through the low level amplifier 43.
It is connected to PtJ. On the other hand, each of the holders 29.
30 is attached with noise filters 44 and 45 consisting of a parallel circuit of a capacitor C1 and a resistor R3. The values of the capacitor C+ and the resistor R3 are set to values that allow the high frequency signal outputted from the high frequency oscillator 39 to easily pass therethrough and that make it difficult to pick up noise at other frequencies. noise filter 4
4.45 can be either detachably attached to or built into the holder 29.30.

If the noise filters 44 and 45 are of a removable type, they can also be formed on the touch sensors A and B as shown in FIGS. 3 and 4. That is, capacitor C1 and resistor R3 connected in parallel are housed in insulating case 48, first contact terminal 49 is connected to one connection point of capacitor CI and resistor R1, and capacitor CI and resistor R1 are connected in parallel. A second contact terminal 50 is connected to the other connection point. The first contact terminal 49 and the second contact terminal 50 are made to protrude outward from inside the case 48, and the second contact terminal 50 is held between the holders 29 and 30 during remote control, and when the first contact terminal The terminal 49 is brought into contact with the base material 31, 32. Further, the insulating case 48 is provided with a clip 28 that can be hung on the worker's clothes. Holder 2
9. In the built-in type, the noise filters 44 and 45 are fixed to the insulating cover 27 of each holder 29 and 30, as shown in FIG. and the other ends of noise filters 44 and 45 are connected to contacts 46 and 47, respectively. Each contact 46, 47 is provided to protrude from the insulating cover 27.

The generator 2 has a winding from which a commercial frequency alternating current power source can be taken out, and power can be supplied from the winding to a load via a breaker 51. The output line 52 leading to the breaker 51, and further the pilot winding 13 from the generator 2 to the diode circuit 37 and diode circuit 38! An automatic slow speed current transformer CT is attached to the (auxiliary winding). The automatic slow speed current transformer CT has an automatic slow speed device 5.
Connect 5. When a load current is detected in the automatic slow speed current transformer CT2, the solenoid 56 is deenergized and the engine 1 is controlled to operate at a high speed rated operation. When the automatic speed slowing device 55 performs automatic speed slowing control, it goes without saying that the automatic speed slowing switch SWt must be closed in advance. When a load current is supplied to the load via the breaker 51, this is detected and input to the remote control unit 16.

Further, when the engine 1 is started, a part of the power generation output of the dynamo 3 is taken in by the remote control unit 16 to detect whether or not the engine 1 is started.

Next, a method for remotely controlling an engine welding machine will be explained. In this case, the remote control/manual selector switch 1
Switch 7 to the remote control side in advance (.

First, to explain engine startup when the switching circuit 20 for one person and two people is switched to one for one person, the contact 46 of the holder 29 or the first contact terminal 49 of the touch sensor A is connected to the base material 31. Make contact twice with an interval of seconds between. As a result of experiments, the contact time (pulse width) was found to be about 0.16 m5 to 1 s, and the contact interval (pulse interval) to be about 96 m5 to 18 m was most convenient. This contact causes the high frequency oscillator 3
A high frequency signal for remote control output from 9 is transmitted from welding cable 33a to holder 29, noise filter 44, and base material 3.
1 and welding cable 33b, is detected by the signal detection current transformer CT, and is input to the CPU via the first amplifier 41 and the low-level amplifier 43. CPU
Then, processing operations as shown in FIG. 6 are performed. In other words, if you start in step 1, in step 2 it is determined whether or not the engine start signal as described above has been input, and when it is input, the process advances to step 3. In step 3, the buzzer is activated 2 seconds before the start of preheating. A second-second beep alerts people around the engine to prevent danger. Next, in step 4, preheating is performed. Preheating can be freely set within a range of 0 to 15 seconds depending on conditions such as ambient temperature. After sufficient preheating is performed in step 5, the starter 4 is driven to start the engine 1 in step 6. Step 7
Then, it is determined whether engine l has been started. If the engine 1 is not started, proceed to step 8 and determine whether 5 seconds have elapsed since the starter 4 was driven.
If 5 seconds have not passed, return to step 7; if 5 seconds have passed, turn off all operations including preheating in step 9.
In step 10, the activation control is stopped. Thereafter, to restart engine I, start over from step 1.

If it is determined in step 7 that the engine 1 has been started, the process proceeds to step 11. Whether or not the engine 1 is started is determined by whether or not the dynamo 3 outputs an output. Next, in step 11, the circuit for driving the starter 4 and the circuit for preheating are turned off, and in step 12, starting of the engine 1 is completed. When the engine 1 is started, it becomes a low-speed operation, and the welding rod clamped in the holder 29.30 is short-circuited to the base metal 31.32, and when the AC power source is connected and a load current flows, a current transformer for load detection is connected. The CT detects this, and the automatic speed reduction device 55 operates to deenergize the solenoid 56, causing the engine 1 to operate at a high speed rated and generating a predetermined output from the generator 2.

After a certain period of time has elapsed after the load is used, the automatic slow speed operation device 5
5 causes engine 1 to operate at low speed.

During the engine startup control described above, if a condition in which power is supplied to the load from alternating current occurs within 5 seconds after the engine 1 is started, the remote control unit 16 immediately stops the engine 1. In other words, if the remote control unit 16 detects a load current from the AC power supply within 5 seconds after confirming that the engine 1 has started using the power generation output of the dynamo 3, the remote control unit 16 activates the stop solenoid 11 via the stop relay 10. If the engine 1 is started and the engine 1 is stopped, and the load is connected to the AC power source, the load will suddenly start up, which is dangerous, so this danger is prevented.

Next, remote control for adjusting the value of welding current during welding work will be explained. In this case, as mentioned above, 2
The human changeover switch SWl has been changed to one person,
It is assumed that the remote control unit 16 has detected this fact.

First, as shown in FIG. 7, the process starts in step 1, and in step 2 it is determined whether or not the engine 1 has started. When it is determined that the engine 1 has started, the process proceeds to step 3.

In step 3, the resistance value of the first current setting variable resistor VR is read and stored.

On the other hand, the resistance value of the second current setting variable resistor VR2 is also read, but in the case of the one-use type, the second current controller 24 is not remotely controlled, and the second current setting variable resistor V
The second current controller 24 controls the thyristor of the second bridge circuit 19 with the value of R. That is, the thyristor of the second bridge circuit 19 is controlled only by the value set by the second t-current setting variable resistor VR by manual operation. Next, in step 4, it is determined whether there is a current increase signal. The current increase signal contacts the contactor 46 of the holder 29 or the first contact terminal 49 of the touch sensor A four times. This contact time and contact interval are the same as in the case of activation described above. Due to this contact, a high frequency signal for remote control from the high frequency oscillator 39 is transmitted to the welding cable 33a, the holder 29,
Noise filter 44, base material 31 and welding cable 33b
This pulse-like high frequency signal for remote control is detected by the signal detection current transformer CT, and the first amplifier 4
1. Input to the remote control unit 16 via the roll bell amplifier 43. If it is determined that there is a current increase signal, in step 5, the remote control unit 16 issues an instruction to the first current controller 23 to control the first bridge circuit 8 by the first current controller 23. increase the welding current. In controlling this welding current, the control range from the maximum value to the minimum value is divided into a plurality of equal parts, and each time it is determined that there is a current increase signal, the welding current is increased by one step.

In this case, the value set by the first current setting variable resistor VR read in step 3 above is increased as a reference.

In step 6, the welding current increase control is completed. Conversely, when reducing the value of the welding current, the contact 4 is attached to the base metal 31.
6 or the first welding terminal 49 three times.

The conditions for this contact are also the same as those at the time of activation. Step 7
Then, in the same manner as described above, the remote control unit 16 determines whether or not there is a current reduction signal, and when there is a current reduction signal, the process proceeds to step 8. In step 8, each time it is determined that there is a current reduction signal, the control range is decreased by one step among the values obtained by dividing the control range into multiple equal parts,
In step 9, the welding current reduction control is completed.

Next, when the engine 1 is to be stopped, as shown in FIG. 8, the process is started in step 1, and in step 2 it is determined whether or not there is an engine stop signal. The engine stop signal is generated by a remote control high frequency output from the high frequency oscillator 39 when the contact 46 of the holder 29 or the first contact terminal 49 of the touch sensor A is brought into continuous contact with the base material 31 for 3 seconds or more. Signal detection current transformer C
T.

is detected, the first amplifier 41 and the low level amplifier 4
3 to the remote control unit 16, especially the CP
It is input to U. If in step 2 it is determined that there is an engine stop signal, then in step 3 a buzzer is sounded for about 2 seconds 2 seconds before the engine is stopped. In step 4, the remote control unit 16 turns off the operating circuit, and in step 5, it is determined whether the engine 1 has stopped after 30 seconds, and if the engine 1 has not stopped,
In step 6, the buzzer sounds to issue a warning, and in step 7, only when the starter switch 8 is in the stop position or the remote control/manual changeover switch F is in the manual side, proceed to step 8 and stop the buzzer sounding operation. let When it is determined in step 5 that the engine is to be stopped, the process proceeds to step 9 and the engine stop control is completed. The contact 46 of the holder 29 or the first contact of the touch sensor A is attached to the base material 31.
When an attempt is made to stop the engine 1 by contacting the contact terminal 49 of the engine 1, the remote control unit 16 detects that it is in use while the AC load is being supplied with power from the AC power source, and the engine stop signal is output. Engine 1 will not be stopped even if an input is made. The starter switch 8 is given priority over the remote control unit 16, so that when the starter switch 8 is switched to the stop position, the engine 1 is stopped regardless of the remote control operation.

When welding is performed by two people, the one-person/two-person changeover switch SW1 is switched to the two-person operation side.

With this switching, the fact that the system is for two people is input to the remote control unit 16. Starting or stopping the engine 1 is exactly the same as described above, but remote control of starting or stopping the engine is possible only on one output terminal 21a, 21a side, and not on the other output terminal 22a, 22b side. In other words, on the other output terminal 22a, 22b side, the base material 3
2 with the contact 47 of the holder 30 or the first contact terminal 49 of the touch sensor B so that even if a high frequency signal for remote control from the high frequency oscillator 39 is input to the remote control unit 16, it will not be accepted. . However, the value of the welding current can be determined independently. This remote control method of welding current is carried out in exactly the same manner as shown in FIG. 7 for one person, but
In this case, the thyristor in the first bridge circuit 18 is independently controlled by the first current controller 23, and the thyristor in the second bridge circuit 19 is independently controlled by the second current controller 24.

When the 1-person/2-person switch SW is switched to 1-person mode, the welding current can be adjusted by operating the second current setting variable resistor R2 on the side that is not remotely controlled. The welding current can also be adjusted on the engine welding machine body, which is installed at a distance from the engine, for convenience.

Furthermore, as shown in Fig. 9, even if the remote control high frequency signal P+Pg is input to the CPU within 1 second after welding is completed, the C
PU does not accept it, and equivalent remote control cannot be performed. The pulse interval of the high frequency signal for remote control is set in advance to 0, 96.
Even if the width is narrower than m5 to 1s, the CPU does not accept it as a signal for remote control.

By the way, the above-mentioned high frequency signal for remote control is transmitted to the base material 31.3.
2 and the contact piece 46.47 of each holder 29.30 or the first contact terminal 49 of the touch sensor A, B, the welding cable is superimposed on the welding cables 33a, 33b, 34a, 34b. 33a, 33b, 34a, 3
Since welding current also flows through 4b, it is necessary to distinguish it from this welding current. Current transformer CT + for signal detection shown in Fig. 2
When a welding current is detected, a high level is output from the first amplifier 41 after noise is removed by the noise filter 57, and therefore a high level is output not only from the low level amplifier 43 but also from the high level amplifier 42 and sent to the CPU. Since the signal is input, the CPU determines that it is not a remote control high frequency signal. Since the remote control high frequency signal has a lower level than the welding current, after the noise is removed by the noise filter 57 as described above, it is input to the CPU only through the low level amplifier 43 and processed.

In addition, the base material 31, 32 and each holder 2 are connected to the CPU as described above.
9.30 contacts 46.47 or each touch sensor A,
A pulsed remote control high frequency signal is received by contact with the first contact terminal 49 of B to perform various controls such as starting and stopping. - It is also possible to carry out various controls by first performing integration and then converting the integrated value into a level value and then comparing it with a set level value. When the welding rod clamped in each holder 29.30 contacts the base material 31.31, the contactor 46.47 of each holder 29.30 or the touch sensor A, B Identification when the first contact terminal 49 of is brought into contact with the base material 31, 32 is performed in exactly the same manner as described above.

To manually start or stop the engine 1 by setting the remote control/manual changeover switch 17 to the manual position, after setting the starter switch 8 to the preheating position and performing preheating,
When the engine 1 is set to the starting position, the engine 1 is started, and then the engine 1 enters the normal operating state at the operating position, as is well known.

"Effects of the Invention" As described above, according to the method and device for remote control of an engine welding machine according to the present invention, it is possible to prevent a signal for controlling a welding current from being mistakenly identified as another welding current itself. For models with multiple output circuits, the welding current can be controlled independently for each output circuit, and there is a variable resistor for current setting for manual setting. By automatically adjusting the value based on the value, it is very convenient that it can be predicted in advance to match the welding conditions and set using the variable resistor for current setting, and then automatically adjusted to the optimal value.

[Brief explanation of the drawing]

The drawings show an embodiment of the remote control method and device for an engine welding machine according to the present invention, FIG. 1 is an overall block diagram thereof, and FIG. 2 shows a remote control high frequency signal outputted from a high frequency oscillator to the CPLI A block diagram showing the path to input, Figures 3 and 4 are configuration diagrams showing the touch sensor, Figure 5 is a configuration diagram showing an example where a noise filter is built into the holder, and Figure 6 is a configuration diagram showing the engine startup. 7 is a flowchart showing remote control when increasing or decreasing the welding current, FIG. 8 is a flowchart showing remote control when stopping the engine, and FIG. 9 is a flowchart showing remote control when increasing or decreasing the welding current.
FIG. 3 is a waveform diagram showing a state in which a high frequency signal for remote control cannot be accepted after welding is completed. 1... Engine 2... Generator 16...
Remote control unit 35...First remote control circuit 36...Second remote control circuit 39...High frequency oscillators 44, 45...Noise filters A, B...Touch sensor Fig. 6-37 La- From A to B From B 2'74-

Claims (6)

[Claims] (1) A high-frequency signal for remote control is superimposed on the welding cable in addition to the welding current, and the output end of the welding cable is brought into contact with the welding base material a set number of times to form a control cord through a noise filter. A remote control method for an engine welding machine, characterized in that the remote control unit determines whether the coded high frequency signal for remote control caused by this contact is an increase or decrease of the welding current and controls the current controller. (2) Remotely control multiple welding outputs by superimposing high-frequency signals for remote control on each welding cable and contacting the output end of the welding cable with the base material through a noise filter to remotely control the high-frequency signal for remote control coded. 2. The remote control method for an engine welding machine according to claim 1, wherein the unit discriminates each welding output circuit and independently controls the current controller in each welding output circuit. (3) The range in which the welding current can be controlled by the current controller is divided into multiple stages, and when the remote control unit receives an increase/decrease command by a high-frequency signal for remote control, one step each time an increase/decrease command is received. A method for remotely controlling an engine welding machine according to claim 1 or claim 2, further comprising controlling a current controller to increase or decrease the welding current. (4) The value set by the variable resistor for current setting is read into the remote control unit in advance, and when the remote control unit receives an increase/decrease command from the high frequency signal for remote control, the above current is set by the command from the remote control unit. Engine welding according to claim (1), claim (2), or claim (3), characterized in that the current controller controls the welding current to increase or decrease based on a set value by a variable resistor for engine welding. How to remotely control the machine. (5) A high-frequency oscillator for superimposing a high-frequency signal for remote control on the welding cable, a noise filter connected to the output end of the welding cable, and an output end of the welding cable superimposed on the welding cable and via the noise filter. It consists of a remote control unit that accepts high-frequency signals for remote control coded according to the number of times the welding current contacts the base metal and determines whether the welding current increases or decreases, and a current controller that controls the welding current based on commands from the remote control unit. A remote control device for an engine welding machine characterized by: (6) Engine welding according to claim (5), characterized in that the welding output circuit has a plurality of sets, and each welding output circuit is provided with a noise filter, a remote control unit, and a current controller, respectively. Machine remote control device.