JP2525401Y2 - Engine welder with built-in battery - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to an engine welding machine with a built-in battery used outdoors, especially as a chopper control circuit power supply that freely adjusts welding current depending on welding use conditions. The output winding for the welding power source and the battery are used separately to improve the output of the AC power source when welding and the electric tool (lighting) are used at the same time, to reduce the size of the engine when using a large current, and to reduce fuel consumption and noise. It relates to a possible engine welding machine with a built-in battery.

2. Description of the Related Art Generally, when welding work is performed outdoors, an engine welding machine using an engine as a driving source is widely used. The engine welding machine is used as a welding power source for light steel frame construction, pipeline laying construction, heavy steel frame construction, bridge dyeing, highway construction, etc., and is widely used in various other construction sites. Used in In addition, an AC power supply is required to use an electric tool for performing a finishing operation of a welding portion in addition to the welding operation, and to use a submersible motor, an illumination lamp, and the like. For this reason, as shown in FIG. 12, the conventional engine welding machine uses the welding power source armature winding and the AC power source armature winding on the welding generator 1 so that the AC power source can be used simultaneously with the welding operation. Is wound, and a welding output can be taken out from the welding power supply armature winding through the control rectifier circuit 2 and the welding power supply terminal 3, while a welding output can be taken out from the AC power supply armature winding through the AC power supply terminal 4. It has become. The welding generator 1 is configured such that the load capacity of the AC power supply is limited based on the welding capacity in use. In FIG. 12, reference numeral 5 denotes a field coil, and reference numeral 6 denotes an excitation power supply. For example, when an engine welding machine having a rated current of 240 A uses both a welding power source and an AC power source at the same time, the usable capacity of the AC power source is as shown in the following table.

Usually, in an outdoor welding operation, a welding rod of φ3.2 is most often used. On the other hand, as for an AC power source, an engine welding machine capable of simultaneously using a 3.5 KVA power tool is demanded. In recent years, the number of welding operations in the field has increased, and a welding machine capable of simultaneously welding two persons with one engine welding machine has been used. Even in such a welding machine that can be used at the same time, an engine welding machine that can take out an AC output of 4 KVA from an AC power supply at the same time as the above welding work when two φ3.2 welding rods are used at the same time is desired. .

"Problems to be solved by the present invention" However, with the conventional engine welding machine described above, when using a φ3.2 welding rod, the capacity of the AC power supply that can be used simultaneously is less than 2KVA, which is about the same as the power supply for lighting. Can be used only, and cannot be used for power tools having a larger capacity. In particular, when two people perform welding work simultaneously using a φ3.2 welding rod with one engine welding machine, only AC power of 1 KVA or less can be used at the same time, and night lighting cannot be used. In such a case, it is necessary to operate the engine generator separately at the same time, which is not only uneconomical but also has a problem that the noise becomes loud. On the other hand, in welding work, engine welding machines are also used for repairing various industrial machines used at construction work sites, but iron plates that need to repair power shovel buckets etc. as industrial machines Because of the large thickness, a welding rod of 6φ or more is required, and a welding machine having an output of about 400 A must be used to satisfy this requirement. When welding only steel for construction, a welding machine with an output of about 260A is sufficient, but in order to use it as a power supply for repairing industrial machinery as described above, a welding machine with an output of about 400A must be provided. In particular, industrial machines are not frequently repaired, and they are used very few times.If a large engine is used as a drive source to obtain an output of 400 A for repairing industrial machines, welding The whole machine becomes large, and the noise is increased, as well as the economical problem of fuel consumption, which causes noise pollution in the vicinity, which is not preferable.

Therefore, in view of the above circumstances, the present invention uses an engine welding machine and a battery together for repairing industrial machinery, or when large output is required, such as when welding is performed by two people at the same time and AC power is also taken out at the same time. In the case of other small-capacity welding work, the use of only an engine welding machine enables two-person welding and increases the capacity when using an AC power source, and also enables engine welding. It is an object of the present invention to provide an engine welding machine with a built-in battery capable of suppressing an increase in the output capacity of the machine, reducing engine noise and reducing the size of the entire apparatus.

"Means and Actions for Solving the Problems" The present invention has been made to achieve the above object, and in claim (1), comprises an output winding for an AC power supply and an output winding for a welding power supply. In the engine welding machine, the output winding for welding power supply is provided with output characteristic switching means for switching output characteristics in several stages, and in each stage of the output characteristic switching means, a chopper control circuit for freely adjusting the output current is provided. The welding power supply output winding and the battery are used as the power supply for the chopper control circuit, and the power supply can be switched according to welding conditions, and the welding power supply output winding is connected to the chopper in a weak current range and a medium current range. As a power source, a battery is used in a strong current region.

In claim (2), the welding power supply output winding is divided into two, one of the welding power supply output windings is used for a weak current range / medium current range, and the other is used for a strong current range and a power supply for a chopper control circuit.
Through the switch, the welding power supply output winding for the high current range and the battery are connected in parallel, and in the weak current range and the middle current range, the welding power supply output winding for the high current range is used as the power supply for chopper control,
In the high current range, the battery is switched to the chopper control power supply.

According to the third aspect of the present invention, an independent chopper control circuit is provided for each of the welding power supply output windings for the weak current range and the middle current range and the welding power supply output winding for the high current range, and welding is performed on each welding power supply output winding. An output terminal for a power supply is provided to enable two-person welding and large-output welding via a switch.

Hereinafter, an embodiment of the battery-equipped engine welding machine according to the present invention will be described with reference to the drawings. 1 to 4 show a first embodiment. In FIG. 1, reference numeral 11 denotes an engine welding generator driven by an engine (not shown) as a drive source, and 12 denotes a battery of a power source for a chopper control circuit described later. . The generator 11 for engine welding is supplied with a field coil 15 by a separate excitation power supply 14.
An AC power supply output winding 17 and a welding power supply output winding 18 are provided.
The AC power supply output winding 17 is connected to the AC power supply output terminals 20 to 22 via the no-phase breaker 19 so that the AC power supply can be taken out from the AC power supply output terminals 20 to 22. The welding power supply output winding 18 is connected to welding power supply output terminals 26 and 27 via a reactor 23, a changeover switch 24, and a three-phase full-wave rectifier 25. Further, the welding power supply output winding 18 is configured to obtain a DC output through a three-phase full-wave rectifier 28 as a power supply for the welding current adjusting chopper control circuit 13. Switch 29 to the positive terminal of the three-phase full-wave rectifier 28, a switching transistor Tr, DC reactor 30 and the current above through the detection resistor R ₁ welding power supply output terminal 26
The negative terminal of the second three-phase full-wave rectifier 28 is connected to a battery.
Connected to the-terminal of 12. The switching transistor Tr is the welding current adjustment chopper control circuit 13 is the welding power source output terminal from the switching transistor Tr controls the pulse width based on the current value detected by the current detection resistor R ₁
Based on the welding current supplied to the two-phase full-wave rectifier 25 and supplied to the two-phase full-wave rectifier 25, the welding current superimposed by the second three-phase full-wave rectifier 28 can be linearly adjusted by the current setter VR. ing. The power of the chopper control circuit 13 can be switched to a battery power by the switch 29.

The reactor 23 is provided with taps for switching in three stages, and the changeover switch 24 switches the range of the welding current to a strong, medium, and weak current range.

Note In FIG. 1, C ₁ is a capacitor, D ₁ is a flywheel diode. Next, the simultaneous usable capacity of the AC power supply for each welding current range in the first embodiment will be described with reference to FIGS.

(1) Low current range Engine welder with built-in battery shown in FIG.
When the changeover switch 24 is set to the weak position in the example of an engine welding machine for 260A), the output winding 18 for the welding power source is set.
Is output from the welding power source output terminals 26 and 27 through the reactor 23, the changeover switch 24 and the three-phase full-wave rectifier 25, and a patent curve 31 shown in FIG. 2 is obtained. That is, 33 is an arc characteristic curve, and a welding current of 30 A is output.

In the weak current range, the changeover switch 29 is set to the a side. Accordingly, the power supply of the chopper control circuit 13 is a DC power supply in which the output winding 18 for the welding power supply is rectified by the second three-phase full-wave rectifier 28. The capacity of the chopper control circuit 13 is 30 to 14
The range up to 0A can be adjusted.

Therefore, as shown in the characteristic curve of FIG.
Welding rectification indicated by the characteristic curve 31 output from 25 (30A)
The power supply (140 A) of the chopper control circuit 13 using the second three-phase full-wave rectifier 28 as a power supply is superimposed thereon, and the characteristic curve between the characteristic curves 31 to 32 can be freely selected by the current setting device VR. ing.

Since the rated welding current of the generator for engine welding is designed to be 260A, when welding with 3.2φ welding rod (welding current 130A), it is about 50
Because of the light load of 3%, it is possible to use up to 3.2KW for single phase and 4KVA for three phase even if AC power is used at the same time.

(2) Medium current range When the changeover switch 24 is set to the middle position, the output of the welding power supply output winding 18 is set to the reactor 23 and the changeover switch 24.
And through the three-phase full-wave rectifier 25, the output terminals 26 and 2 for the welding power source.
From FIG. 7, the characteristic curve 34 shown in FIG. 3 is obtained. That is, 33
This means that a welding current of 120 A is output for the arc characteristic curve.

In the middle current range, the changeover switch 29 is set to the b side. Therefore, as the power source of the chopper control circuit 13, a welding current of 140 A is superimposed using the battery as the power source.

Therefore, as shown in FIG.
The welding current up to 0A can be freely selected by the current setting device VR.

In this case, it is sufficient for the engine welding machine to output a welding current of 120 A, and the rest is supplemented by the battery output.
Conventionally, when welding was performed using a φ welding rod, the capacity that could be used simultaneously with an AC power supply was about 300 W,
Up to 4.8KW single-phase and 6KVA three-phase can be used simultaneously.

(3) Strong current range When the changeover switch 24 is set to the strong position, the output of the welding power supply output winding 18 passes through the reactor 23, the changeover switch 24, and the three-phase full-wave rectifier 25, and the output terminals 26, 27 for welding power supply. From this, a characteristic curve 36 shown in FIG. 4 is obtained. That is, a welding current of 260 A is output for the 33 arc characteristic curves.

In the high current range, keep the changeover switch 29 in the middle current range.
When set to the side, the power supply of the chopper control circuit 13 is superimposed with a welding current of up to 140 A using a battery as a power supply.

Therefore, as shown in FIG.
The welding current up to 400A can be freely selected by the current setting device VR.

In this case, the rated output of 260A is used uniformly as the engine welding machine, the battery output is also used to the maximum, and welding work for repairing industrial machinery is performed using a large diameter welding rod with a maximum current of 8φ. Can do it.

Although it is not possible to use the auxiliary power supply at the same time, the engine output can be 260 A and the noise and fuel consumption can be greatly reduced as compared with the conventional 400 A welding machine.

 In FIG. 1, cont is a constant current control circuit.

5 to 8 show a second embodiment, which has two independent sets of output windings 38 and 39 for a welding power source. First
The welding power source output winding 38 is connected to the welding power source output terminals 26 and 27 via a changeover switch 44 for switching between a weak current region and a medium current region via a reactor 40 and a three-phase full-wave rectifier 25a. . The second welding power supply output winding 39 is connected to the three-phase full-wave rectifier 25b via a reactor 41 that is magnetically coupled to the reactor 40. The changeover switch 44 is connected to the + terminal of the three-phase full-wave rectifier 25b via the open / close switch 42 which is closed when the changeover switch 44 is in the middle current range and is set to the higher current range. Furthermore, to connect the same switching transistor Tr ₁ and the first embodiment through the second changeover switch 43 which switches in response to the opening and closing switch 42 to open and close the positive terminal of the three-phase full-wave rectifier 25b, the the switching transistor Tr ₁ connects the first embodiment and the same DC reactor 30 and the current detection resistor R ₁ output terminal 27 for the welding power source on one side through. Switching transistor
Tr ₁ is a welding current set in advance by controlling the duty cycle of the switching transistor Tr ₁ based on the value of the welding current detected by the welding current adjusting chopper control circuit 13 by the current detecting resistor R ₁ , as in the first embodiment. Is adjusted to obtain The battery 12 is connected to the other switch terminal of the second switch 43 in the same manner as in the first embodiment. Other configurations are the same as those of the first embodiment.

In the second embodiment, (1) in the state where the weak current range changeover switch 44 is switched to the weak current range, the output from the first welding power supply output winding 38 is the reactor 40, the changeover switch 44, and the three-phase full-wave rectifier 25a. To the output terminals 26 and 27 for welding power supply. On the other hand, open / close switch 4
2 is opened, and the second switch 43 is switched to the + terminal side of the three-phase full-wave rectifier 25b. Accordingly, the output of the second welding power supply output winding 39 is supplied to the reactor 41 and the three-phase full-wave rectifier 25.
b, and it is provided to the switching transistor Tr ₁ via the second changeover switch 43, in the switching transistor Tr ₁ is adjusted to the current in the first embodiment similarly to a preset value, the three-phase full-wave It is provided to welding power output terminals 26 and 27 so as to be superimposed on the output of the rectifier 25a. From the first welding power supply output winding 38 to the welding power supply output terminal
The welding power applied to the welding power supply terminals 26 and 27 from the second welding power supply output winding 39 is shown in FIG. A characteristic curve 46 shown in FIG. Thus from the characteristic curves 45, 46 and arc characteristic curve 33,. 30A to the control operation of the switching transistor Tr ₁ by the welding current for adjusting chopper control circuit 13
It can be varied by the current setting device VR within the range of 170A.

(2) Middle current range To switch the welding output that can be taken out from the welding power source output terminals 26 and 27 to the middle current range, the changeover switch 44 is switched to the middle current range. The other open / close switch 42 and the second changeover switch 43 are set at the same position as the weak current range of the welding output. Accordingly, the welding output applied from the first welding power supply output winding 38 to the welding power supply output terminals 26 and 27 via the reactor 40, the changeover switch 43 and the three-phase full-wave rectifier 25a is represented by the characteristic curve 47 shown in FIG. It increases as compared to the weak current region. The output of the second welding power supply output winding 39 is superimposed on the output the same manner as in the case the switching transistor Tr ₁ in a controlled and welding power supply output terminals 26 and 27 to the three-phase full-wave rectifier 25a of the weak position The welding power exhibits a characteristic curve 48 shown in FIG. Therefore, the variable within the range of 120~260A by the switching transistor Tr ₁ as determined from the characteristic curves 47, 48 and the arc characteristic curve 33. When the second welding power supply output winding 39 is used as the power supply for the welding current adjustment chopper control circuit 13, the AC power supply cannot be used at the same time. This is the same as in the first embodiment.

(3) High current range To switch the welding output to the high current range, select the switch.
Set 44 to the middle current range, close the open / close switch 42,
The second switch 43 is switched to the battery 12 side. For this reason, the output of the first welding power supply output winding 38 is
40, through the changeover switch 44 and the three-phase full-wave rectifier 25a in the middle current range state, are applied to the welding power supply output terminals 26 and 27,
The output of the second welding power supply output winding 39 is applied to the welding power supply output terminals 26 and 27 via the reactor 41, the three-phase full-wave rectifier 25b and the on / off switch 42, and the characteristics of these welding outputs are determined by the second power supply. A characteristic curve 49 shown in FIG. While the second selector switch 43 the output of the battery 12, the switching transistor Tr, but applied to the welding power supply output terminals 26 and 27 via the reactor 30 and the current detection resistor R _1, the battery 12 by the switching transistor Tr ₁ Are freely varied to exhibit a characteristic curve 50 shown in FIG. Therefore,
When the welding output is in the strong current range state, the output value of 260A which is the sum of the outputs of the first welding power supply output winding 38 and the second welding power supply output winding 39, which cannot be changed, is superimposed on this. The output value of 400 A, which is the maximum value that can be varied by the current setting device VR from the battery 12, can be set freely as desired.
The open / close switch 42 and the changeover switches 43 and 44 operate in conjunction with each other.

FIG. 9 to FIG. 11 show a third embodiment, in which two persons can perform a welding operation at the same time. In the third embodiment, the form in which welding work is performed by one person and the welding output is used by switching from low to medium to strong is performed in the same manner as in the above-described second embodiment. in case of,
The circuit configuration for obtaining a welding output from the first welding power supply output winding 38 is the same as that of the first embodiment with the switch 29 being switched to the + terminal side of the second three-phase full-wave rectifier 28, instead of the switch 29 is inserted between the opening and closing switch 51 and the second three-phase full wave rectifier 28 and the switching transistor Tr _2, so it may retrieve welding output from the first welding power supply output terminals 52 I do. The reactor 40 has a changeover switch 44 for switching between a weak current region and a medium current region in the same manner as in the second embodiment. On the other hand, the circuit configuration for obtaining a welding output from the second welding power supply output winding 39 is the same as the circuit configuration in which the switch 29 is switched to the battery 12 in the first embodiment. The output from the power supply output winding 39 and the battery 12 can be taken out from the second welding power supply output terminals 54 and 55. The output from this time battery 12 are then adapted to freely set the switching transistor Tr ₃ by the same manner as described above welding current adjustment chopper control circuit 13b. Between the first welding power supply output terminals 52 and 53 and the second welding power supply output terminals 54 and 55, a third changeover switch 56 for selecting one person or two persons is provided. Connect with intervening.

Then, when the welding work is performed by two persons at the same time, the third changeover switch 56 is opened. When welding output is taken out using the first welding power supply output terminals 52 and 53 and welding is performed, a part of the output of the first welding power supply output winding 38 is supplied to the reactor 40 and the changeover switch 44. , And three-phase full-wave rectifier
The output is supplied to the first welding power supply output terminals 52 and 53 via the switch 25a. When the changeover switch 44 is switched from the weak current range to the middle current range, the welding output is increased or decreased in the same manner as in the second embodiment. In the weak current region, a characteristic curve 59 shown in FIG. 10 is exhibited. Another output of the first welding power supply for the output winding 38, the second three-phase full wave rectifier 28 is provided to the switching transistor Tr ₂ via the opening and closing switch 51, the switching transistor according to the welding current for adjusting chopper control circuit 13a freely variable by a DC reactor 30a to the value preset in the control operation of the tr _2, is supplied to the first welding power supply output terminals 52 via the current detection resistor R _2, the welding output is 10
A characteristic curve 60 shown in FIG. Therefore, as shown in FIG. 10, from the characteristic curves 59 and 60 and the arc characteristic curve 33, it can be varied within the range of 30 A to 170 A in the weak current range, and 120 A in the medium current range as in the second embodiment. It can vary within the range of ~ 260A. The welding output that can be taken out from the second welding power supply output terminals 54 and 55 is supplied from the second welding power supply output winding 39 indicated by the characteristic curve 61 in FIG. 11 to the reactor 41 and the three-phase full-wave rectifier 25b.
And a welding output obtained through the switching transistor Tr ₃ for varying the current value from the battery 12 by the welding current adjusting chopper control circuit 13 b, the DC reactor 30 b, and the current detecting resistor R _3. The output value is the sum of the welding output and a characteristic such as a characteristic curve 62 shown in FIG. That is, as shown in FIG. 11, the welding output obtained from the second welding power source output terminals 54, 55
An output that can be varied within the range of 30 A to 170 A as determined from 2 and the arc characteristic curve 33 can be used. Therefore, the capacity of the engine generator when two persons are simultaneously welded in the middle current range is as follows. Then, the output terminals 54 and 55 for the second welding power source are 30 (A), and the total is 160 (A).
Therefore, an AC power supply of about 3KW can be used at the same time.
In FIG. 9, C ₂ and C ₃ are capacitors and D ₂ and D ₃ flywheel diodes.

[Effects of the Invention] As described above, according to the engine welding machine with a built-in battery according to the present invention, in the weak current range, even when welding is performed using a welding rod of 2.6φ to 3.2φ, the AC power source side is also simultaneously operated. The use of power tools of about 3.4KVA is possible.

Even when two people use welding rods of 2.6φ to 3.2φ in the weak current range at the same time, they can use a power tool of about 3KVA at the same time even when performing welding work.

When performing welding work using a large-diameter welding rod of 8φ for repairing large-capacity industrial equipment, for example, a battery power supply is superimposed on the engine generator, and the engine body outputs a welding current of 260A. 400A welding is possible with
The engine output can be greatly reduced and the size and weight can be reduced, and the noise and fuel consumption can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of an engine welding machine with a built-in battery according to the present invention, FIG. 2 is a characteristic curve diagram in the range where the welding output of FIG. 1 is in a weak current range, and FIG. FIG. 4 is a characteristic curve diagram when the welding output is in the middle current range, FIG. 4 is a characteristic curve diagram when the welding output is in the strong current range in FIG. 1, FIG. 5 is a circuit diagram showing the second embodiment, and FIG. 7 is a characteristic curve when the welding output is in the weak current range, FIG. 7 is a characteristic curve when the welding output is in the middle current range in FIG. 5, and FIG. 8 is a characteristic curve when the welding output is in the strong current range in FIG. FIG. 9, FIG. 9 is a circuit diagram of the third embodiment, FIG. 10 is a characteristic curve diagram of the welding output of one of the welding power source output windings in FIG. 9 in a weak current range, and FIG. FIG. 12 is a characteristic curve diagram of the welding output of the other output winding for a welding power source, and FIG. 12 is a circuit diagram of a conventional engine welding machine. 11 ... generator for engine welding, 12 ... battery 13,13a, 13b ... chopper control circuit for welding current adjustment 17 ... output winding for AC power supply 18 ... output winding for welding power supply 23,23a, 23b, 30,40, 41 ... Reactor 24,44 ... Changeover switch 26,27 ... Output terminal for welding power supply 29 ... Switch 38 ... Output winding for first welding power supply 39 ... Output winding for second welding power supply 42,51 ... Open / close switch 43 ... second changeover switch 52 ... first welding power supply output terminal 56 ... third selector switch Tr ₁ to Tr ₃ ... switching transistor

Claims (3)

(57) [Scope of request for utility model registration] In an engine welding machine provided with an output winding for an AC power supply and an output winding for a welding power supply, welding is performed via output characteristic switching means for switching output characteristics to the output winding for the welding power supply in several stages. A power supply terminal is connected and a welding current adjusting chopper control circuit is connected in parallel with the welding power supply terminal, and the power supply of the chopper control circuit is the welding power supply output winding;
An engine welding machine with a built-in battery, wherein the welding machine is connected via a switch so as to be switchable with a battery. 2. An output winding for a welding power source is divided into two parts, one output winding for a welding power source is used for a weak current region and a medium current region, and the other output winding is used for a high current region and a chopper control circuit power source. 3. The engine welding machine with a built-in battery according to claim 1, wherein the switch is connected to a chopper control circuit via a switch. 3. An independent chopper control circuit is provided for each welding power output winding, a welding power output terminal is provided for each welding power output winding, and two welding power output terminals are connected to each other. The engine welding machine with a built-in battery according to claim 2, wherein the welding machine and the high output welding are connected via a switch.