JP2021028077A - Battery TIG welder - Google Patents

Abstract

To provide a battery TIG welder capable of adopting a high-voltage start method.SOLUTION: A battery TIG welder according to the present invention comprises: a housing 20; a TIG torch connection section 22 provided in the housing 20; an AC power connection section provided in the housing 20; battery cells 1 to 16; a charging circuit; a high frequency high voltage generation circuit for generating high frequency high voltage based on electric power charged in the battery cells 1 to 16; and a main control circuit 28 for controlling output of the high frequency high voltage from the high frequency high voltage generation circuit to the TIG torch connection section 22, wherein the high frequency high voltage generation circuit includes a high voltage control board 32 and an induction coil 34; the high voltage control board 32 includes, on an identical board, a transformer, a varistor protection circuit, and a noise filter circuit; electromagnetic shield members 41 to 43 are provided between the high voltage control board 32 and the main control circuit 28 in the fore-rear direction of the housing 20.SELECTED DRAWING: Figure 2

Description

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

Conventionally, a battery welding machine has been effectively used when performing welding work in a place where there is no AC power supply.

Generally, a battery welding machine includes a portable housing, welding electrodes provided in the housing, an AC power connection portion provided in the housing, and a plurality of batteries housed in the housing. A battery cell, a charging circuit housed in the housing and connected to the AC power supply connection portion, and controlling charging of the plurality of battery cells by an AC power source connected to the AC power supply connection portion, and the plurality of batteries. It includes a main control circuit that controls 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 total voltage thereof is monitored (managed).

In addition, as patent applications relating to battery welding machines, for example, Patent Document 1 and Patent Document 2 have been published.

Japanese Unexamined Patent Publication No. 2000-348778 Japanese Unexamined Patent Publication No. 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, then the TIG torch is energized, and the TIG torch is pulled away from the welding base material while the welding base material and the TIG torch are energized. Start welding. Such an aspect is called a touch start method.

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

On the other hand, in another aspect of TIG welding, a high frequency high voltage (for example, about Welding is started by applying 4 kV). Such an embodiment is called a high frequency high voltage start method.

In TIG welding that employs a high-frequency, high-voltage start method, tungsten used in the TIG torch is less likely to get caught in the welded portion, and high welding quality can be achieved. However, it has been pointed out that noise management is difficult because high frequency and high voltage are used.

Here, in the case of an AC-driven TIG welder, since the high-frequency transformer functions to suppress noise, it is possible to manage noise to the extent that the main control circuit is not adversely affected. However, in a battery-powered (DC-driven) TIG welder, it is possible to manage noise to the extent that the main control circuit is not adversely affected by simply providing a noise filter circuit near the high-frequency high-voltage generation circuit. I wasn't.

The present invention has been devised based on the above findings. An object of the present invention is to provide a battery TIG welder capable of adopting a high-frequency high-voltage start method by controlling noise during driving of a high-frequency high-voltage generation circuit to the extent that the main control circuit is not adversely affected. is there.

In the present invention, a portable housing, a TIG torch connection portion provided in the housing, an AC power supply connection portion provided in the housing, a battery cell housed in the housing, and a housing. A charging circuit housed in the body and connected to the AC power supply connection portion to control charging of the battery cell by the AC power supply connected to the AC power supply connection portion, and a charging circuit housed in the housing and charging the battery cell. A high-frequency high-voltage generation circuit that generates a high-frequency high voltage based on the generated power, and a main control that is housed in the housing and controls the output of the high-frequency high voltage from the high-frequency high-voltage generation circuit to the TIG torch connection portion. The high-voltage high-voltage generation circuit includes a circuit, 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, and the like. A battery characterized in that an electromagnetic shielding member is provided between the high voltage control board and the main control circuit in the front-rear direction or the left-right direction of the housing. It is a TIG welding machine.

According to the present invention, since the transformer, the varistor protection circuit, and the noise filter circuit are centrally arranged on the same high voltage control board (with substantially the shortest wiring to each other), noise when a high frequency high voltage is generated is generated. Can be effectively absorbed. By providing 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 a high-frequency high voltage is generated adversely affects the main control circuit. The effect 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, the second electromagnetic shielding member is provided on the side opposite to the electromagnetic shielding member with respect to the high voltage control board, and the third electromagnetic shielding member is provided on the upper side of the high voltage control board. According to this, it is more effectively suppressed that noise when a high frequency and high voltage is generated adversely affects 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 configured. According to this, the manufacturing and management of the parts are easy, and the assembly of the battery TIG welding machine is also easy.

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.

Further, it is preferable that the fourth electromagnetic shielding member is provided on the lower side of the high voltage control board. According to this, it is more effectively suppressed that noise when a high frequency and high voltage is generated adversely affects the main control circuit.

Further, the TIG torch connection portion can also be connected to a hand rod instead of the TIG torch, and the housing is provided with a mode switching unit for switching between TIG welding and hand rod welding. The high-frequency high-voltage generation circuit is designed to generate the high-frequency high voltage when TIG welding is selected in the mode switching unit, and when hand-bar welding is selected in the mode switching unit, the high-frequency high voltage is generated. It is preferable that no voltage is generated.

According to this, it is easy to switch between TIG welding and hand bar welding, and since unnecessary high frequency and high voltage are 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 centrally arranged on the same high voltage control board (with substantially the shortest wiring to each other), noise when a high frequency high voltage is generated is generated. Can be effectively absorbed. By providing 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 a high-frequency high voltage is generated adversely affects the main control circuit. The effect 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).

It is a schematic circuit diagram of the battery TIG welding machine which concerns on one Embodiment of this invention. It is a schematic vertical sectional view of the battery TIG welding machine which concerns on this embodiment. It is a schematic front view of the high voltage control board shown in FIGS. 1 and 2. It is a schematic side view of the high voltage control board shown in FIGS. 1 to 3. It is a schematic front view of the battery TIG welding machine which concerns on this embodiment. This is the dial portion of the battery TIG welding machine according to the present embodiment. It is a schematic diagram which shows.

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 an embodiment of the present invention, FIG. 2 is a schematic vertical sectional view of the battery TIG welder 100 according to the present embodiment, and FIG. 1 is a schematic front 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. 5 is a schematic side view of the present embodiment. It 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 the present embodiment.

In particular, as shown in FIGS. 2 and 5, the battery TIG welder 100 according to the present embodiment includes a housing 20 provided with a handle (not shown) for carrying. Then, as shown in FIGS. 1 and 5, the TIG torch connecting portion 22 (− side electrode) to which the TIG torch (not shown) is connected is welded to the lower portion on the front side (front side) of the housing 20. A welded base material connecting portion (+ side electrode) 24 connected to the base material is provided.

It is possible to perform TIG welding work on the welding base material in a state where the TIG torch is connected to the TIG torch connecting portion 22 and the welding base material is connected to the welding base material connecting portion 24.

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

Further, 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, and the six battery cells 1, 4 to 8 are arranged in parallel in the first stage, and the second stage. , Six battery cells 2, 3, 9 to 12 are arranged in parallel, and four battery cells 13 to 16 are arranged in parallel in the third stage.

Each center of the top surface and the bottom surface of each battery cell is an electrode, and the electrode arrangements of the adjacent battery cells are opposite to each other, and as shown in FIG. 2, the adjacent electrodes of the adjacent battery cells The 16 battery cells 1 to 16 are electrically connected by being connected by a conductive plate.

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

In the battery TIG welding machine 100 of the present embodiment, as shown in FIGS. 1 to 4, a high frequency high voltage is generated in the housing 20 based on the electric power charged in the plurality of battery cells 1 to 16. A high voltage generation circuit 30 is provided.

The high-frequency high-voltage generation circuit 30 includes a high-voltage control board 32 and an induction coil 34. In the present embodiment, the high-voltage control board 32 is the upper portion on the front side of the housing 20. The substrate 32 is arranged so as to be vertically oriented, and the induction coil 34 is arranged so that the coil axis direction is horizontal in the lower portion on the front side of the housing 20.

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

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

Further, 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 portion 22 (− side electrode) and the welding base material connection portion 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 the present embodiment, an aluminum plate 41 having substantially the same size (about 75 mm × 125 mm) as the substrate 32 is provided immediately behind the high voltage control substrate 32 in substantially parallel to the substrate 32. Further, an aluminum plate 42 as a second electromagnetic shielding member is provided on the side opposite to the aluminum plate 41 (that is, the front side) with respect to the high voltage control board 32 substantially parallel to the aluminum plate 41, and further high voltage control is performed. 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 (about 75 mm × 125 mm) as the high voltage control board 32.

In the present embodiment, the three aluminum plates 41 to 43 are integrally connected to form a U-shaped member in a side view.

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 may be provided substantially parallel to the aluminum plate 43, for example, so as to bridge the lower edge portion of the aluminum plate 41 and the lower edge portion of the aluminum plate 42.

The main control circuit 28 connects to the TIG torch connection portion 22 (− side electrode) and the welding base material connection portion 24 (+ side electrode) according to the adjustment amount of the adjustment knob 51 (see FIGS. 2 and 5) by the user, for example. 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 welding machine 100 of the present embodiment, as shown in FIGS. 5 and 6, the current value and output waveform after the start of welding are displayed. An input unit capable of inputting setting information relating to the above is provided, and the main control circuit 28 provides an applied voltage based on the setting information input in the input unit.

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 the start of welding. For example, the frequency of the pulse waveform is set. be able to.

Further, the TIG torch connection portion 22 of the battery TIG welder 100 of the present embodiment can selectively connect the TIG torch and the hand rod, and the input portion on the front side (front side) of the housing 20 is , Includes a mode switching button 52 (an example of a mode switching unit) for switching between TIG welding and hand bar welding (see FIGS. 5 and 6). The high-frequency high-voltage generation circuit 30 generates a high-frequency high voltage when TIG welding is selected by the mode switching button 52, while the hand bar 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 welding machine 100 of the present embodiment as described above, the transformer 32t, the varistor protection circuit 32b, and the noise filter circuit 32n are integrated on the same high voltage control board 32 (with substantially the shortest wiring to each other). ) Because it is arranged, noise when a high frequency high voltage is generated can be effectively absorbed.

Further, according to the battery TIG welding machine 100 of the present embodiment, an 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. Therefore, it is effectively suppressed that noise when a high frequency and high voltage is generated adversely affects the main control circuit 28.

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

Further, according to the battery TIG welding machine 100 of the present embodiment, an aluminum plate 42 (an example of a second electromagnetic shielding member) is provided on the opposite side of the high voltage control board 32 from the aluminum plate 41, and the high voltage control board is provided. Since the aluminum plate 43 (an example of the third electromagnetic shielding member) is also provided on the upper side of the 32, it is possible to more effectively suppress the adverse effect of noise when a high frequency and high voltage is generated on the main control circuit 28. There is.

Further, according to the battery TIG welding machine 100 of the present embodiment, since the three aluminum plates 41 to 43 are integrally connected, the manufacturing and management of the parts are easy, and the battery TIG welding machine 100 Easy to assemble. Further, by selecting the aluminum plates 41 to 43 as the electromagnetic shielding member, effective noise shielding is realized at low cost.

Further, if the fourth electromagnetic shielding member is also provided on the lower side of the high voltage control board 32, it is possible to more effectively suppress the noise generated when the high frequency high voltage is generated from adversely affecting the main control circuit 28.

Further, according to the battery TIG welding machine 100 of the present embodiment, an input unit capable of inputting setting information regarding the current value and the output waveform after the start of welding is provided, and the main control circuit 28 inputs at the input unit. Since the applied voltage is provided based on the setting information to be applied, it is possible to make detailed settings for the current value and output waveform after the start of welding, as with an AC-driven TIG welder. It is possible to finely respond to the characteristics of welding materials such as differences in thick plates.

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

Further, according to the battery TIG welding machine 100 of the present embodiment, the TIG torch connecting portion 22 can selectively connect the TIG torch and the hand rod, and the housing 20 is connected to 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 generation circuit 30 generates high-frequency high voltage when TIG welding is selected by the mode switching button 52, while mode switching. When hand rod welding is selected by the button 52, high frequency and high voltage are not generated. As a result, it is easy to switch between TIG welding and hand bar welding, and since unnecessary high frequency and high voltage are not generated, the influence of noise can be minimized.

When welding is started in a state where the welding base material and the TIG torch are in contact with each other, for example, the high frequency high voltage generating circuit 30 is prevented from generating the high frequency high voltage by the control of the main control circuit 28. Is preferable. Specifically, when the main control circuit 28 detects a state in which 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 high voltage start method (they automatically switch to such a state). Is preferable.

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 (6)

With a portable housing
With the TIG torch connection part provided in the housing,
With the AC power supply connection part provided in the housing,
The battery cell housed in the housing and
A charging circuit housed in the housing, connected to the AC power supply connection portion, and controlling charging of the battery cell by the AC power supply connected to the AC power supply connection portion.
A high-frequency high-voltage generation circuit housed in the housing and generating a high-frequency high voltage based on the electric power charged in the battery cell,
A main control circuit housed in the housing and controlling a high-frequency high-voltage output from the high-frequency high-voltage generation circuit to the TIG torch connection portion.
With
The high-frequency high-voltage generation circuit includes 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.
A battery TIG welder characterized in that an electromagnetic shielding member is provided between the high voltage control board and the main control circuit in the front-rear direction or the left-right direction of the housing. A second electromagnetic shielding member is provided on the opposite side of the high voltage control board from the electromagnetic shielding member.
The battery TIG welder according to claim 1, wherein a third electromagnetic shielding member is provided on the upper side of the high voltage control board. The battery TIG welder according to claim 2, wherein the electromagnetic shielding member, the second electromagnetic shielding member, and the third electromagnetic shielding member are integrally configured. The battery TIG welder according to claim 2 or 3, wherein the electromagnetic shielding member, the second electromagnetic shielding member, and the third electromagnetic shielding member are made of aluminum. The battery TIG welder according to any one of claims 1 to 4, wherein a fourth electromagnetic shielding member is provided on the lower side of the high voltage control board. The TIG torch connection portion can also connect a hand stick instead of the TIG torch.
The housing is provided with a mode switching unit for switching between TIG welding and hand bar welding.
The high-frequency high-voltage generation circuit is adapted to generate the high-frequency high voltage when TIG welding is selected in the mode switching unit, and the high-frequency high voltage is generated when hand bar welding is selected in the mode switching unit. The battery welding machine according to any one of claims 1 to 5, wherein a high voltage is not generated.

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