JPH087977Y2 - Remote control device for engine-driven semi-automatic welding machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is an engine-driven semi-automatic welding that can perform automatic slow-speed control of an engine without using a cable dedicated to remote control and can prevent electric shock accidents. Relates to a remote control device for a machine.

[Conventional technology]

Generally, arc welding includes a manual method, a semi-automatic method, and a fully automatic method. In the manual method, the welding rod is clamped by the welding holder, and the welding work is performed by manually moving the welding rod. In the semi-automatic system, the feeding of the core wire is automatically performed by a core wire feeding motor, and the welding torch is moved manually. The fully automatic method is
Not only the core wire is fed, but also the welding torch is moved by fully automatic control.

The above-mentioned conventional semi-automatic system is a type in which a welding output is obtained by a transformer or a rectifier using a commercial power source as in JP-A-58-25869 and JP-A-53-125732. It is widely used that it is installed at a position for welding work, and also in Japanese Utility Model Publication No. Sho 62-19406, it is intended to reduce the power loss when there is no load.
Moreover, since the welding power source equipment is connected to the AC power source, it can be understood as a stationary type in a factory that uses a commercial power source. In the stationary type installed in such a factory, the core wire feeding device is pulled out from the welding machine main body installed at a predetermined location with a cable, and the core wire feeding device is moved within a limited range to perform welding work. It is carried out. In the above-mentioned manual method, if the welding rod is removed from the welding holder after the welding is completed, the conductive portion of the welding holder is not exposed to the outside, so that inadvertent arcing or electric shock does not occur. On the other hand, in the semi-automatic method, unless the core wire feeding motor is stopped even when the welding is stopped, the feeding of the core wire is continued and the core wire comes into contact with the welding base metal or a nearby iron plate, etc. Cause electric shock and
When welding is stopped, the welding power supply circuit is cut off by a relay.

[Problems to be solved by the device]

By the way, in recent years, there is a demand for the use of a semi-automatic welding machine driven by an engine even in an outdoor construction site where a commercial power source cannot be used. However, when the semi-automatic welding machine is driven by the engine, the weight increases due to the mounting of the engine,
Also, from the viewpoint of engine noise and exhaust gas, install the engine-driven welding machine main body on a truck parked on the first floor or near the work site, and feed the torch and core wire from the engine-driven welding machine main body by welding power cable. It is necessary to pull out the core wire feeder equipped with the motor and carry it to a welding work site such as a floor at a higher place. In addition, a dedicated cable for preventing electric shock and operating the automatic slowing device must be connected between the engine-driven welding machine main body and the core wire feeder. In particular, in the case of the manual method, since the short-circuit current when the welding machine is short-circuited to the base metal is used as the operation signal source of the automatic slow speed device, a dedicated cable for the automatic slow speed device is not required. However, in the case of the semi-automatic method, the welding power supply circuit must be cut off by a relay so as not to send the welding core wire when the welding is stopped, so the short-circuit current as in the above-mentioned manual method cannot be used as the operation signal source. Therefore, a separate control cable for the automatic slowdown device must be provided. Therefore, when the core wire feeder is moved to another welding work site, particularly a building site, and the floor is different, the cable group is once wound and the core wire feeder is newly moved and then reconnected. But,
In addition to the welding power cable, there is a dedicated cable for preventing electric shock and operating the automatic slowing device, which increases the weight.
In addition, the number of times of winding and connecting work is increased, and a complicated work is forced. On the other hand, after the completion of the welding work, an electric grinder for finishing the welded portion, an electric drill for drilling work, lighting, etc.
An AC power source is required near the work site, but in order to obtain such an AC power source, it is necessary to pull it out from the engine welding machine body with a dedicated cable or install a dedicated engine generator separately. Then, the number of cables and the number of facilities are further increased to promote the above problems. Moreover, when using either the welding power source or the AC power source,
The circuit must be configured in order to prevent the electric shock and to operate the automatic slow speed device reliably, and there are many problems such as a cause of complication of the circuit and an increase in cost.

Therefore, in view of the above circumstances, the present invention uses the current flowing in the AC auxiliary power cable to perform the electric shock prevention and the automatic slow-speed control operations without the need to separately lay a dedicated cable. The circuit structure for automatic slow speed control does not become complicated, it is easy to move to the work place, and the rectifier is effectively used to distinguish the use of the welding power source from the use of the AC auxiliary power source. It is therefore an object of the present invention to provide a remote control device for an engine-driven semi-automatic welding machine, which can separately perform the control operations for preventing electric shock and automatically slowing down.

[Means and Actions for Solving the Problems]

The present invention has been made to achieve the above-mentioned object. An engine-driven semi-automatic welding machine includes an engine-driven welding machine body,
A hand control unit, which has a core wire feeder, an AC auxiliary power outlet, and a torch switch, while the engine-driven welding machine body has a generator and a first
The current transformer using the Hall element, the first relay, the automatic slow speed control device, the second current transformer using the Hall element, and the second relay. Then, when the torch switch is turned on to perform welding work, the DC rectified by the first rectifier is rectified by the first rectifier, the series resistor and the torch switch from the engine drive welding machine main body through the AC auxiliary power cable. An electric current flows. This DC current is detected by the current transformer using the first Hall element to excite the first relay, and the automatic slowing device is operated to switch the engine from the low speed to the rated motion, and the generator to the welding power cable. A welding current is supplied to the core wire feeding motor and the welding core wire via the, and the welding is performed while the welding core wire is fed from the torch by the core wire feeding motor. At this time, the current transformer using the second Hall element does not detect the DC current flowing through the AC auxiliary power cable by the third rectifier, and therefore does not detect it. On the other hand, when the AC auxiliary power source is taken out using the AC auxiliary power outlet, the first current transformer using the hall element detects the AC current flowing through the AC auxiliary power cable, and the above-mentioned first relay is used. The automatic slowdown system switches the engine from low speed to rated operation. At the same time, the second Hall element-using current transformer detects the alternating current flowing through the AC auxiliary power cable to excite the second relay, and welds it from the engine-driven welding machine body to the core wire feeder through the welding power cable. The electric current cuts off irreversibly.

〔Example〕

An embodiment of an engine-driven semi-automatic welding machine according to the present invention will be described below with reference to the drawings. In FIG. 1, 1 is an engine-driven welding machine main body, and 2 is a hand controller. The engine-driven welding machine body 1 includes an engine 3 and the engine 3.
And a generator 4 driven by. The generator 4 is
The AC output can be taken out not only as a power source for lighting equipment and power tools but also as a welding power source. The AC output that is output as the welding power source of the generator 4 is a normally open contact of the three-phase full-wave rectifier 5 and the welding output relay MS described later.
The welding power source cables 6 and 7 are connected to the welding output terminals 8 and 9 via ms. On the other hand, the AC output for the power tool of the generator 4 is the AC auxiliary power output terminals 10 and 11 to which the AC auxiliary power cables 31 and 32 are connected.
Will be provided to A first Hall element-using current transformer 13 in an automatic slowing device 20 is inserted in a connecting line 12 that connects the generator 4 and one output terminal 11 for an AC auxiliary power supply. As shown in FIG. 2, the first Hall element-using current transformer 13 includes a C-shaped iron core 15 having a gap 14 through which the connecting wire 12 is inserted, and a Hall element 16 housed in the gap 14. Consists of, connecting line 12
The magnetic flux Φ whose magnitude changes according to the value of the current I flowing in
It occurs inside the shape iron core 15, and from the Hall element 16 the C-shape iron core 15
It outputs an electromotive force having a value corresponding to the magnitude of the magnetic flux Φ therein, and can detect whether the current I flowing through the connecting line 12 is alternating. The current transformer 13 using the first Hall element is connected to the first relay RA via the amplifier 17 and the switching circuit 18.
Of the solenoid (hereinafter simply referred to as the first relay RA). The first relay RA is excited by the battery 19 by the control operation of the switching circuit 18. When the first relay RA is excited, the normally open contact ra is turned on. The normally open contact point ra turns on. The normally open contact point ra is connected in series to the solenoid of the timer T (hereinafter simply referred to as timer T), and when turned on, the battery 21 energizes and excites the timer T. The normally closed time limit contact rt of the timer T is connected in series with the governor operating solenoid 22, and in the ON state, the battery 21 is energized to excite the governor operating solenoid 22. The governor actuating solenoid 22 is
23 is switched to the low speed side, and when degaussed, the governor 23 is switched to the high speed, high speed operation side. Two second rectifiers 24 connected in parallel to each other in the connection line 12 are arranged in opposite directions.
a and the third rectifier 24b are inserted. The second Hall element-using current transformer 25 is inserted in series with the third rectifier 24b. The second Hall element-using current transformer 25 has exactly the same configuration as the first Hall element-using current transformer 13. The second Hall element-using current transformer 25 is connected to a solenoid of a second relay RB (hereinafter simply referred to as a second relay RB) via an amplifier 26 and a switching circuit 27. The second relay RB is excited by the battery 28 by the control operation of the switching circuit 27 to turn off the normally closed contact rb. Normally closed contact rb is a welding output relay
It is connected in series to an MS solenoid (hereinafter simply referred to as a welding output relay MS). Further, the normally closed contact rb and the welding output relay MS connected in series are connected in parallel to the timer T. The normally open contact ms of the welding output relay MS is inserted between the three-phase full-wave rectifier 5 and the welding output terminal 8. Welding input terminals 29, 30 to which welding power supply cables 6, 7 are connected to the hand control unit 2 and an AC auxiliary power supply cable 31,
AC auxiliary power supply input terminals 33 and 34 to which 32 is connected. A core wire feeding motor 36 in a core wire feeding device 35 is connected in parallel to the welding input terminals 29, 30. Core wire feeding motor 36
Is for rotating the reel 38 around which the welding core wire 37 is wound, and when the reel 38 rotates, the welding core wire 37 is sent out from the torch 39. Further, one welding input terminal 29 is connected to the welding core wire 37. The other welding input terminal 30 is connected to the base material 40. An AC auxiliary power outlet 41 is connected to the AC auxiliary power input terminals 33, 34. Furthermore, input terminals for AC auxiliary power supply 33, 34
Between the first rectifier 42 and the series resistor 43 connected in series.
And a torch switch 44 is connected. The torch switch 44 is attached to the torch 39. The first rectifier 42 and the third rectifier 24b are arranged in opposite directions to prevent the flow of current, and the first rectifier 42 and the second rectifier 24a are arranged so that the current can flow. is there.

Next, the operation of the remote control device for the engine-driven semi-automatic welding machine having the above configuration will be described. The engine-driven welding machine body 1 is installed on the first floor of a construction site or mounted on a truck parked in the vicinity. On the other hand, the hand control unit 2 is to be sequentially carried and installed near the place to be welded, and every time it is installed, welding power supply cables 6 and 7 Connect with auxiliary power cables 31 and 32. In this case, the welding power supply cables 6 and 7 are connected between the welding output terminals 8 and 9 and the welding input terminals 29 and 30, and the AC auxiliary power supply cables 31 and 32 are connected to the AC auxiliary power supply output terminal 10. Of course, it is connected between the input terminals 11 and 11 and the input terminals 33 and 34 for the AC auxiliary power source. Then, the engine 3 is started. Since the timer T is not excited by simply starting the engine 3, the normally closed contact rt is turned on, the governor operating solenoid 22 is excited by the battery 21, and the governor 23 is moved to the low speed side. The engine 3 is operated at a low speed.

When performing welding work next time, the torch switch 44 is turned on. When the torch switch 44 is turned on, the generator 4 and the AC auxiliary power cable 31, the first rectifier 4, the series resistor 43
A direct current rectified by the first rectifier 42 flows so as to reach the torch switch 44 via the above, and further return to the generator 4 via the AC auxiliary power cable 32. At this time, the first Hall element utilizing current transformer 13 detects the direct current flowing through the connection line 12 and causes the switching circuit 18 to operate via the amplifier 17, and the operation of the switching circuit 18 causes the first The relay RA is excited by energization from the battery 19. First relay
When RA is excited, the normally open contact ra turns on and timer T
Is energized, the normally closed contact rt is immediately turned off to demagnetize the governor operating solenoid 22. Therefore, the governor
Demagnetization of the governor actuating solenoid 22 switches to the rated operation side 23, and the engine 3 is brought into the rated operation. Further, the direct current flowing through the connecting line 12 flows only in the second rectifier 24a, and does not flow in the other third rectifier 24b because it is in the opposite direction and is detected by the second Hall element utilizing current transformer 25. It will not be done. Therefore, since the second relay RB is not excited, the normally closed contact rb maintains the ON state, and as described above, the normally open contact ra is maintained.
Is turned on, the welding output relay MS
It is energized and excited at 21. When the welding output relay MS is excited, the normally open contact ms turns on. Since the normally-open contact ms is turned on and the engine 3 is in the rated operation as described above, the generator 4 supplies the rated welding current to the welding core wire 37 and the base metal 40 through the welding power source cables 6 and 7. And the core wire feeding motor 36 at the same time. Therefore, the core feeding motor 36
To rotate the reel 38 from the torch 39 to the welding core wire 37
Welding work is carried out while sending. If the welding operation is stopped, a direct current does not flow through the connection line 12, so the first relay RA is demagnetized without being detected by the first Hall element utilizing current transformer 13. Therefore, the normally open contact ra is turned off, the normally open contact ms is turned off by the demagnetization of the welding output relay MS, the supply of the welding current is interrupted, and the timer T is demagnetized. However, the normally closed time limit contact rt is The governor 23 is kept at the rated operating side by keeping it off until a certain delay time elapses, so that even if there is a temporary arc break, it can be immediately eliminated, that is, a good arc rise can be obtained. I am allowed to do so. After the delay time elapses, the normally closed time limit contact rt turns on and excites the governor operating solenoid 22.
23 is switched to the low speed side and the engine 3 is operated at a low speed. Needless to say, the core wire feeding motor 36 is stopped at the same time as the welding is stopped and the welding core wire 37 is not delivered from the torch 39.

When an electric power tool or the like is used by using the AC auxiliary power outlet 41, the power tool or the like is used from the generator 4 through the AC auxiliary power cables 31, 32 and the AC auxiliary power outlet 41 by using the electric tool or the like. An alternating current is supplied to the load of No. 1, and this alternating current is detected by the first Hall element-using current transformer 13 to excite the first relay RA in the same manner as above to switch the governor 23 to the rated operation side. Thus, the engine 3 is operated at the rated speed, and the rated AC output is supplied from the generator 4 to the load such as the electric power tool. On the other hand, this alternating current flows through the second rectifier 24a and the third rectifier 24b, so
The Hall element-using current transformer 25 detects the AC current, and operates the switching circuit 27 via the amplifier 26. By the operation of the switching circuit 27, the second relay RB is excited and the normally closed contact rb is turned off, so that the welding output relay MS is demagnetized. The deenergization of the welding output relay MS turns off the normally open contact ms, and cuts off the supply of welding current from the three-phase full-wave rectifier 5 to the hand control unit 2.
Therefore, when the AC auxiliary power outlet 41 is used to supply the AC output to the electric power tool or the like, the welding current is not supplied from the engine-driven welding machine main body 1 to the hand control unit 2, and therefore the electric shock is generated. No accidents will occur. If the power supply to the load such as the power tool from the AC auxiliary power outlet 41 is stopped, nothing is detected in the first Hall element-using current transformer 13 and the second Hall element-using current transformer 25, so the first relay Both RA and the second relay RB are demagnetized, and after a certain delay time, the normally closed contact rt closes to excite the governor actuating solenoid 22 and switch the governor 23 to the low speed side in the same manner as described above. Set 3 to low speed operation.

The batteries 19, 21 and 28 also share the engine starting battery.

[Effect of device]

As described above, according to the remote control device for an engine-driven semi-automatic welding machine according to the present invention, as a signal source for controlling the core wire feeding by turning on the torch switch and the rated operation of the engine as well as for electric tools and the like. Since an AC auxiliary power supply is used, there is no need to use a dedicated cable for electric shock prevention and automatic slow speed control, and only the minimum required cable is available to multiple welding work points. It is easy to carry and move. Also, when an AC auxiliary power source is used for power tools, etc., the supply of welding current from the engine-driven welding machine main body to the hand control unit is cut off, so there is no risk of electric shock and it is safe. Be beneficial.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a remote control device for an engine-driven semi-automatic welding machine according to the present invention, and FIG. 2 is a perspective view showing the configuration of a current transformer using a hall element. 1 …… Engine driven welder main body 2 …… Hand control part 3 …… Engine 4 …… Generator 6,7 …… Welding power cable 13 …… First Hall element current transformer 20 …… Automatic slow speed Device, 24a …… Second rectifier 24b …… Third rectifier 31,32 …… AC auxiliary power cable 35 …… Core wire feeder, 36 …… Core wire feeding motor 37 …… Welding core wire, 39 …… Torch 41 …… AC auxiliary power outlet 42 …… First rectifier, 43 …… Series resistance 44 …… Torch switch

Claims (1)

[Scope of utility model registration request] 1. An engine-driven semi-automatic welding machine comprises an engine-driven welding machine main body and a hand control unit, and the hand control unit includes:
A core wire feeding device equipped with a torch and core wire feeding motor that is drawn from the engine-driven welding machine body to the welding power supply cable to supply welding current, and an AC auxiliary power cable drawn from the engine-driven welding machine body It has an AC auxiliary power outlet from which an auxiliary power source can be taken out freely, and a torch switch connected to the AC auxiliary power cable via a first rectifier and a series resistor, while the engine driven welding machine body is driven by the engine. The welding power source and the AC auxiliary power source can be taken out, and the AC current supplied to the hand control unit by the AC auxiliary power cable when the AC auxiliary power outlet is used and the torch switch is turned on, and the first rectifier rectifies the current. The current transformer using the first Hall element that detects the DC current and the detecting operation of the current transformer using the first Hall element A first relay that controls the slow speed device, an automatic slow speed device that switches the engine from a low speed to a rated operation by the operation of the first relay, a second rectifier and a second rectifier that are connected in parallel in opposite directions. Second current transformer using Hall element, which detects only the alternating current supplied to the hand control unit by the AC auxiliary power cable only when the AC auxiliary power outlet is used through the rectifier of No. 3, and the second Hall element A remote of an engine-driven semi-automatic welding machine, characterized in that it has a second relay for interrupting the welding current supplied to the core wire feeding device via the welding power source cable by the detection operation of the current transformer. Control device.