JP7144857B2 - Battery TIG Welder - Google Patents

Description

The present invention relates to a battery TIG welder that has a built-in rechargeable battery and is capable of performing TIG welding based on electric power charged in the battery.

Conventionally, battery welders have been effectively used for welding work in places where there is no AC power source.

In general, a battery welder includes a portable housing, a welding electrode provided in the housing, an AC power connection section provided in the housing, and a plurality of electrodes accommodated in the housing. a battery cell, a charging circuit that is housed in the housing and connected to the AC power supply connection, and controls charging of the plurality of battery cells by an AC power supply connected to the AC power supply connection, and the plurality of batteries. a main control circuit for controlling the output to the welding electrode based on the electric power charged in the cell.

The plurality of battery cells are electrically connected in series, and the overall voltage is monitored (managed).

In addition, Patent Documents 1 and 2, for example, have been published as patent applications relating to battery welders.

JP-A-2000-348778 JP-A-2002-66737

In addition to general arc welding using a hand rod (welding rod), TIG welding using an electrode called a TIG torch is widely used. TIG welding is mainly suitable for welding stainless steel and aluminum.

In TIG welding, the tip of the TIG torch is pressed against the welding base material, and then energization of the TIG torch is started. Start welding. Such a mode is called a touch start method.

However, it has been pointed out that in TIG welding employing the touch start method, tungsten used in the TIG torch is likely to be caught in the welded portion, making it difficult to achieve high welding quality.

On the other hand, in another aspect of TIG welding, a high frequency high voltage (eg, about 4 kV) to initiate welding. Such a mode is called a high frequency high voltage start system.

In TIG welding that employs a high-frequency high-voltage start method, it is difficult for tungsten, which is used in the TIG torch, to get caught in the welded portion, making it possible to achieve high welding quality. However, it has been pointed out that it is difficult to control noise due to the use of high frequency and high voltage.

Here, in the case of an AC-driven TIG welder, the high-frequency transformer has a function of suppressing noise, so it is possible to control noise to such an extent that it does not adversely affect the main control circuit. However, in a battery-driven (DC-driven) TIG welder, simply providing a noise filter circuit near the high-frequency and high-voltage generation circuit does not allow noise to be controlled to the extent that it does not adversely affect the main control circuit. was not

The present invention has been invented based on the above findings. An object of the present invention is to provide a battery TIG welder that enables adoption of a high-frequency high-voltage start method by controlling noise during driving of a high-frequency high-voltage generating circuit to the extent that it does not adversely affect the main control circuit. be.

The present invention provides a portable housing, a TIG torch connection part provided in the housing, an AC power supply connection part provided in the housing, a battery cell housed in the housing, and the housing. a charging circuit housed inside the body and connected to the AC power supply connection portion for controlling charging of the battery cell by the AC power supply connected to the AC power supply connection portion; a high-frequency high-voltage generating circuit for generating a high-frequency high-voltage based on the supplied electric power; and a main control housed in the housing and controlling the output of the high-frequency high-voltage from the high-frequency high-voltage generating circuit to the TIG torch connecting portion. a circuit, wherein the high-frequency high-voltage generating circuit has a high-voltage control board and an induction coil, and the high-voltage control board includes a transformer, a varistor protection circuit, a noise filter circuit, on the same substrate, and an electromagnetic shielding member is provided between the high-voltage control substrate and the main control circuit in the front-rear direction or the left-right direction of the housing. A TIG welder.

According to the present invention, since the transformer, the varistor protection circuit, and the noise filter circuit are collectively arranged on the same high-voltage control board (with substantially shortest wiring to each other), noise when high-frequency high-voltage is generated is reduced. can be effectively absorbed. By installing an electromagnetic shielding member between the high-voltage control board and the main control circuit in the front-rear direction (left-right direction depending on the layout) of the housing, noise when high-frequency high-voltage is generated adversely affects the main control circuit. can be effectively suppressed. Therefore, the battery TIG welder of the present invention can withstand the adoption of the high-frequency high-voltage start method (the risk of malfunction due to noise is remarkably small).

Preferably, a second electromagnetic shielding member is provided on the side opposite to the electromagnetic shielding member with respect to the high voltage control board, and a third electromagnetic shielding member is provided above the high voltage control board. According to this, it is possible to more effectively suppress the adverse effect of noise when high frequency and high voltage is generated on the main control circuit.

In this case, more preferably, the electromagnetic shielding member, the second electromagnetic shielding member and the third electromagnetic shielding member are integrally constructed. According to this, it is easy to manufacture and manage the parts, and it is also easy to assemble the battery TIG welder.

Further, the electromagnetic shielding member, the second electromagnetic shielding member and the third electromagnetic shielding member are made of aluminum. According to this, effective noise shielding can be realized at low cost.

Furthermore, it is preferable that a fourth electromagnetic shielding member is provided below the high voltage control board. According to this, it is possible to more effectively suppress the adverse effect of noise when high frequency and high voltage is generated on the main control circuit.

In addition, the TIG torch connection part can be connected to a hand rod instead of the TIG torch, and the housing is provided with a mode switching part for switching between TIG welding and hand rod welding. The high frequency high voltage generating circuit is adapted to generate the high frequency high voltage when TIG welding is selected in the mode switching unit, and to generate the high frequency high voltage when hand rod welding is selected in the mode switching unit. It is preferably adapted not to generate voltage.

According to this, it is easy to switch between TIG welding and hand-rod welding, and since unnecessary high-frequency high voltage is not generated, the influence of noise can be minimized.

According to the present invention, since the transformer, the varistor protection circuit, and the noise filter circuit are collectively arranged on the same high-voltage control board (with substantially shortest wiring to each other), noise when high-frequency high-voltage is generated is reduced. can be effectively absorbed. By installing an electromagnetic shielding member between the high-voltage control board and the main control circuit in the front-rear direction (left-right direction depending on the layout) of the housing, noise when high-frequency high-voltage is generated adversely affects the main control circuit. can be effectively suppressed. Therefore, the battery TIG welder of the present invention can withstand the adoption of the high-frequency high-voltage start method (the risk of malfunction due to noise is remarkably small).

1 is a schematic circuit diagram of a battery TIG welder according to one embodiment of the present invention; FIG. 1 is a schematic longitudinal sectional view of a battery TIG welder according to this embodiment; FIG. FIG. 3 is a schematic front view of the high voltage control board shown in FIGS. 1 and 2; FIG. FIG. 4 is a schematic side view of the high voltage control board shown in FIGS. 1 to 3; FIG. 1 is a schematic front view of a battery TIG welder according to this embodiment; FIG. It is a dial part of the battery TIG welding machine which concerns on this embodiment. 1 is a schematic diagram showing FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic circuit diagram of a battery TIG welder 100 according to one embodiment of the present invention, FIG. 2 is a schematic longitudinal sectional view of the battery TIG welder 100 according to this embodiment, and FIG. FIG. 4 is a schematic side view of the high voltage control board 32 shown in FIGS. 1 and 2, FIG. 4 is a schematic side view of the high voltage control board 32 shown in FIGS. 1 to 3, and FIG. FIG. 6 is a schematic front view of the battery TIG welder 100, and FIG. 6 is a dial portion of the battery TIG welder 100 according to this embodiment.

Particularly, as shown in FIGS. 2 and 5, the battery TIG welder 100 according to this embodiment includes a housing 20 provided with a handle (not shown) for carrying. Then, as shown in FIGS. 1 and 5, a TIG torch connection part 22 (− side electrode) to which a TIG torch (not shown) is connected to the lower part of the front side (front side) of the housing 20, and welding A welding base metal connection portion (+ side electrode) 24 connected to the base metal is provided.

With the TIG torch connected to the TIG torch connection portion 22 and the welding base material connected to the welding base metal connection portion 24, it is possible to perform a TIG welding operation on the welding base material.

In addition, as shown in FIG. 1, the housing 20 is provided with an AC power connection section 18 . The AC power connection unit 18 is connected to a general 100V commercial AC power supply (outlet) via a cable (not shown).

As shown in FIGS. 1 and 3, 16 battery cells 1 to 16 electrically connected in series are arranged in parallel in the housing 20 . Specifically, the 16 battery cells 1 to 16 are arranged in a three-stage structure, the first stage has six battery cells 1, 4 to 8 arranged in parallel, 6 battery cells 2 to 3 and 9 to 12 are arranged in parallel in the row, and four battery cells 13 to 16 are arranged in parallel in the third row.

Each center of the top surface and bottom surface of each battery cell serves as an electrode, and the electrode arrangement of adjacent battery cells is opposite to each other, and as shown in FIG. The 16 battery cells 1 to 16 are electrically connected by connecting them with conductive plates.

Further, as shown in FIG. 1, the housing 20 is connected to an AC power connection unit 18, and controls charging of the plurality of battery cells 1 to 16 by the AC power connected to the AC power connection unit 18. A charging circuit 19 is provided.

In the battery TIG welder 100 of this embodiment, as shown in FIGS. A high voltage generation circuit 30 is provided.

The high-frequency high-voltage generating circuit 30 has a high-voltage control board 32 and an induction coil 34 . The substrate 32 is arranged vertically, and the induction coil 34 is arranged in the lower front portion of the housing 20 so that the coil axial direction is horizontal.

Furthermore, as shown in FIGS. 3 and 4, the high-voltage control board 32 of this embodiment includes a transformer 32t (in this example, a flyback transformer), a varistor protection circuit 32b, and a noise filter circuit 32n on the same board. have on. As a result, the transformer 32t, the varistor protection circuit 32b, and the noise filter circuit 32n are collectively and electrically connected to each other by substantially shortest wiring. The varistor protection circuit 32b is a circuit for protecting the high voltage control board 32 from a high voltage surge immediately after welding starts.

The high-voltage control board 32 of this embodiment fits within a size of 75 mm×125 mm. Also, the height of the high-voltage control board 32 (maximum height of mounted electric elements (transformer 32t, capacitor, etc.)) is also within 40 mm.

In addition, as shown in FIG. 2, in the housing 20, the output from the high frequency high voltage generation circuit 30 to the TIG torch connection part 22 (negative electrode) and the welding base material connection part 24 (+ side electrode) is controlled. A main control circuit 28 is provided.

An aluminum plate 41 as an electromagnetic shielding member is provided between the high-voltage control board 32 and the main control circuit 28 in the front-rear direction of the housing 20 .

In this embodiment, an aluminum plate 41 having approximately the same size (about 75 mm×125 mm) as the substrate 32 is provided immediately behind the high voltage control substrate 32 and approximately parallel to the substrate 32 . Further, an aluminum plate 42 as a second electromagnetic shielding member is provided substantially parallel to the aluminum plate 41 on the opposite side (that is, the front side) of the aluminum plate 41 with respect to the high voltage control board 32. An aluminum plate 43 as a third electromagnetic shielding member is also provided on the upper side of the substrate 32 . The aluminum plate 42 also has substantially the same size as the high voltage control board 32 (about 75 mm×125 mm).

In this embodiment, three aluminum plates 41 to 43 are integrally connected to form a U-shaped member when viewed from the side.

A noise suppression sheet (not shown) generally available on the market may be provided as a fourth electromagnetic shielding member on the lower side of the high-voltage control board 32 . The noise suppression sheet can be provided substantially parallel to the aluminum plate 43 so as to bridge the lower edge of the aluminum plate 41 and the lower edge of the aluminum plate 42, for example.

The main control circuit 28, for example, according to the adjustment amount of the adjustment knob 51 (see FIGS. 2 and 5) by the user, to the TIG torch connection portion 22 (negative electrode) and welding base metal connection portion 24 (+ side electrode) is designed to control the output of

In addition to the adjustment knob 51, on the front side (front side) of the housing 20 of the battery TIG welder 100 of the present embodiment, as shown in FIGS. The main control circuit 28 is adapted to provide the applied voltage based on the setting information input at the input section.

Specifically, like an AC-driven TIG welder (inverter-type TIG welder), it is possible to make detailed settings for the current value and output waveform after welding starts, for example, setting the pulse waveform frequency. be able to.

Furthermore, the TIG torch connection part 22 of the battery TIG welder 100 of this embodiment can selectively connect the TIG torch and the hand rod, and the input part on the front side (front side) of the housing 20 is , and a mode switching button 52 (an example of a mode switching unit) for switching between TIG welding and manual welding (see FIGS. 5 and 6). The high-frequency high-voltage generating circuit 30 generates a high-frequency high voltage when TIG welding is selected by the mode switching button 52, while manual welding is selected by the mode switching button 52. Sometimes it is designed not to generate high frequency and high voltage.

According to the battery TIG welder 100 of the present embodiment as described above, the transformer 32t, the varistor protection circuit 32b, and the noise filter circuit 32n are collectively mounted on the same high-voltage control board 32 (with substantially shortest wiring to each other). ), the noise when high frequency and high voltage are generated can be effectively absorbed.

Further, according to the battery TIG welder 100 of the present embodiment, the aluminum plate 41 (an example of an electromagnetic shielding member) is provided between the high voltage control board 32 and the main control circuit 28 in the front-rear direction of the housing 20. This effectively suppresses the adverse effect of noise on the main control circuit 28 when high frequency and high voltage is generated.

Combined with the above two effects (effective noise absorption and effective noise shielding), the battery TIG welder 100 of the present embodiment can withstand adoption of the high-frequency high-voltage start method.

Further, according to the battery TIG welder 100 of the present embodiment, the aluminum plate 42 (an example of the second electromagnetic shielding member) is provided on the side opposite to the aluminum plate 41 with respect to the high voltage control board 32, and the high voltage control board Since an aluminum plate 43 (an example of a third electromagnetic shielding member) is also provided on the upper side of 32, adverse effects on the main control circuit 28 caused by noise when high frequency and high voltage are generated are further effectively suppressed. there is

Further, according to the battery TIG welder 100 of the present embodiment, since the three aluminum plates 41 to 43 are integrally connected, manufacturing and management of the parts are easy, and the battery TIG welder 100 Assembly is also easy. Also, by selecting the aluminum plates 41 to 43 as the electromagnetic shielding members, effective noise shielding is realized at low cost.

Furthermore, if a fourth electromagnetic shielding member is also provided on the lower side of the high voltage control board 32, adverse effects on the main control circuit 28 caused by noise when high frequency and high voltage are generated can be more effectively suppressed.

Further, according to the battery TIG welder 100 of the present embodiment, an input section is provided for inputting setting information regarding the current value and the output waveform after welding is started. Since the applied voltage is provided based on the setting information provided, it is possible to make detailed settings for the current value and output waveform after welding starts, like an AC-driven TIG welder. It is possible to finely correspond to the characteristics of welding materials such as differences in thickness.

Furthermore, it is also possible to store a plurality of setting information in advance so that they can be called selectively. According to this, the setting input time before the welding work can be shortened.

Further, according to the battery TIG welder 100 of the present embodiment, the TIG torch connection part 22 can selectively connect the TIG torch and the hand rod, and the housing 20 includes the TIG welding and the hand rod. A mode switching button 52 for switching between welding and welding is provided, and the high frequency high voltage generating circuit 30 generates a high frequency high voltage when TIG welding is selected by the mode switching button 52. When manual welding is selected by the button 52, the high frequency high voltage is not generated. As a result, switching between TIG welding and hand rod welding is easy, and since unnecessary high frequency and high voltage are not generated, the influence of noise can be minimized.

When welding is started with the welding base material and the TIG torch in contact with each other, for example, the main control circuit 28 controls the high frequency and high voltage generation circuit 30 so as not to generate high frequency and high voltage. is preferred. Specifically, when the main control circuit 28 detects that the welding base material and the TIG torch are in contact with each other, the touch start method is adopted instead of the high frequency and high voltage start method (automatically switched to that). is preferred.

1 to 16 battery cell 18 AC power supply connection 19 charging circuit 20 housing 22 TIG torch connection 24 welding base material connection 28 main control circuit 30 high frequency high voltage generation circuit 32 high voltage control board 32b varistor protection circuit 32n noise filter circuit 32t transformer 34 induction coil 41 aluminum plate 42 aluminum plate 43 aluminum plate 51 adjustment knob 52 mode switching button 100 battery TIG welder

Claims (4)

a portable enclosure,
a TIG torch connection part provided in the housing;
an AC power supply connection part provided in the housing;
a battery cell housed in the housing;
a charging circuit housed in the housing and connected to the AC power supply connection for controlling charging of the battery cells by an AC power supply connected to the AC power supply connection;
a high-frequency high-voltage generating circuit that is housed in the housing and generates a high-frequency high voltage based on the electric power charged in the battery cell;
a main control circuit accommodated in the housing and controlling the output of high frequency high voltage from the high frequency high voltage generation circuit to the TIG torch connection part;
with
The high-frequency high-voltage generating circuit has a high-voltage control board and an induction coil,
The high voltage control board has a transformer, a varistor protection circuit, and a noise filter circuit on the same board,
An electromagnetic shielding member is provided between the high-voltage control board and the main control circuit in the front-back direction or the left-right direction of the housing ,
A second electromagnetic shielding member is provided on the side opposite to the electromagnetic shielding member with respect to the high voltage control board,
A third electromagnetic shielding member is provided on the upper side of the high voltage control board,
The electromagnetic shielding member, the second electromagnetic shielding member and the third electromagnetic shielding member are configured integrally.
A battery TIG welder characterized by: 2. The battery TIG welder according to claim 1 , wherein the electromagnetic shielding member, the second electromagnetic shielding member and the third electromagnetic shielding member are made of aluminum. 3. The battery TIG welder according to claim 1, wherein a fourth electromagnetic shielding member is provided below the high voltage control board. The TIG torch connection part can also connect a hand rod instead of the TIG torch,
The housing is provided with a mode switching unit for switching between TIG welding and hand welding,
The high-frequency high-voltage generating circuit is adapted to generate the high-frequency high voltage when TIG welding is selected in the mode switching unit, and to generate the high-frequency high voltage when hand rod welding is selected in the mode switching unit. 4. A battery welder according to any one of claims 1 to 3 , characterized in that it is adapted not to generate high voltage.

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