JP4850463B2 - Arc welding machine - Google Patents

Description

  The present invention relates to a technique for storing a plurality of predetermined welding conditions in a welding power source, and remotely selecting and reproducing one of the stored plurality of welding conditions by a remote control device.

  FIG. 5 is an electrical connection diagram of a conventional arc welder. In the figure, the welding power source WG is based on the main power source circuit INV for supplying power between the wire 2 and the workpiece 3, the predetermined welding current set value Ir and the predetermined welding voltage set value Vr. The output of the main power supply circuit INV is controlled, and one of a plurality of welding conditions consisting of the combination of the welding current set value Ir and the welding voltage set value Vr stored is reproduced to generate the power of the main power supply circuit INV. And a main control circuit SC to be controlled.

  The remote control device RE is formed by a welding current setting device IR and a welding voltage setting device VR using a variable resistor, and is connected to the welding power source WG using wiring. The welding current setter IR and the welding voltage setter VR are supplied with control power from the welding power source WG via a wiring (not shown), and have an analog value set in the variable terminal of the welding current setter IR. The welding current set value Ir and the welding voltage set value Vr as an analog value set at the variable terminal of the welding voltage setter VR are output.

  The welding condition changeover switch WR is a rotary switch disposed in the welding torch 1 shown in FIG. 5, and a scale (1 to 10 and a remote controller) is attached to the welding condition changeover switch WR. When the knob is set at a position of 1 to 10, one of a plurality of welding conditions stored in advance in the main control circuit SC is selected and reproduced based on the set numbers of 1 to 10, and the main power supply is selected. When the power of the circuit INV is controlled and the knob of the welding condition changeover switch WR is set to the position of the remote controller, the main control circuit SC is based on the welding current set value Ir and the welding voltage set value Vr set by the remote control device RE. To control the output of the main power supply circuit INV. When the welding condition setting signal Wc is input from the welding condition selection circuit WC to the main control circuit SC with the knob set to the remote control, the main control circuit SC stores the welding condition setting signal Wc based on the welding condition setting signal Wc. One of the plurality of welding conditions is selected and reproduced to control the power of the main power supply circuit INV.

  As described above, since the operator can easily select one of a plurality of welding conditions stored in the welding power source WG from a remote location by a welding condition changeover switch WR (rotary switch) disposed on the welding torch at hand. There is no need for the operator to return to the welding power source WG and make a selection every time one welding condition ends. Patent Document 1 discloses the above-described technique.

JP 59-165178 A

  In general, when an operator completes one welding with a welding torch and performs the next welding, the operator returns to the place where the welding power source is placed and stores a plurality of stored welding conditions. One must be selected. On the other hand, in the above-described prior art, the welding condition changeover switch (rotary switch) is arranged on the welding torch, and the welding condition stored remotely is selected by using the rotary switch, so that the trouble of returning to the welding power source can be saved. However, in the method of selecting the stored welding conditions using the rotary switch described above, the number of wirings is determined according to the number of stored welding conditions, and the number of stored welding conditions increases, the welding torch As a result, the number of wires from the welding power source increases, the structure becomes complicated, and reliability is lacking.

  In addition, the remote control device is equipped with a microprocessor, and has a function of performing digital communication between the welding power source and the remote control device, and among the plurality of welding conditions stored in the welding power source by the digital communication. Some remote control devices select and play one. However, the microprocessor mounted on the remote control device is expensive, and the microprocessor is liable to malfunction due to noise generated during welding and lacks reliability.

  Therefore, an object of the present invention is to provide an arc welder that solves the above-described problems.

In order to solve the above-described problem, the first invention is formed by a welding current setting device, a welding voltage setting device, and a setting / selection switch, and the welding current setting device outputs a predetermined analog welding current setting value. The welding voltage setting device outputs a predetermined analog welding voltage setting value, the setting / selection switch outputs a setting / selection signal, and a main power circuit for supplying predetermined power to the load And input the welding current set value, the welding voltage set value, and a setting / selection signal, and when the setting / selection signal is in a setting mode, the main power supply is based on the welding current setting value and the welding voltage setting value. controls power circuit, when the set-selection signal selection mode, the welding electricity on the basis of the welding current setting value corresponding to the position of the welding condition number provided on the welding current setting device The welding current setting corresponding to the position of the welding condition number provided in the welding current setting device by selecting one of a plurality of pre-stored welding conditions consisting of a combination of a setting value and the welding voltage setting value One of the plurality of welding conditions is selected based on the value and the welding voltage setting value corresponding to the position of the welding condition number provided in the welding voltage setting device, and the main voltage is selected based on the selected welding condition. An arc welding machine comprising a main control circuit for controlling power of a power supply circuit.

  According to the first aspect of the invention, since the welding current setting device or the welding voltage setting device is also used as a welding condition selector, it is stored in advance in the welding power source only by adding only a setting / selection switch to the remote control device. One welding condition can be selected from a plurality of welding conditions consisting of a combination of a welding current set value and a welding voltage set value. Further, if one of a plurality of pre-stored welding conditions is selected based on the two setting values of the welding current setting value and the welding voltage setting value, it is more than selecting the welding condition based on one setting value. One of the stored welding conditions can be selected. In addition, the number of components and the number of wirings can be reduced, malfunctions are less likely to occur due to noise generated during welding, reliability is improved, and further, no expensive parts are required, so low cost can be realized. .

[Embodiment 1]
FIG. 1 is a connection diagram of an arc welder according to Embodiment 1 of the present invention. In the figure, the same reference numerals as those in the electrical connection diagram of the arc welding machine of the prior art shown in FIG.

  The remote control device REC shown in FIG. 1 is formed by a welding current setting device IR, a welding voltage setting device VR, and a single contact setting / selecting switch SW5. The welding current setting device IR sets a welding current with a predetermined analog value. The value Ir is set and output, the welding voltage setting device VR sets and outputs a predetermined analog welding voltage setting value Vr, and the setting / selection switch sets and sets the setting mode and selection mode. -It outputs as selection signal Sw5.

  The welding condition setting / selection circuit WS is formed by a welding current setting switch SW1, a welding voltage setting switch SW2, a welding condition selection switch SW3, and an inverting circuit NT, and the setting / selecting switch SW5 of the remote control device REC is set to a setting mode (open). Then, the selection / setting signal Sw5 becomes a high level, the welding current setting switch SW1 and the welding voltage setting switch SW2 are in a conductive state, and the welding current setting value Ir and the welding current set by the welding current setting device IR are set to the analog value. An analog welding voltage set value Vr set by the voltage setter VR is input to the main control circuit SC.

  When the main control circuit SC enters the setting mode, the main control circuit SC controls the power of the main power supply circuit INV based on the input welding current set value Ir and welding voltage set value Vr. When the welding condition setting signal Wc is input to the main control circuit SC from the welding condition selection circuit WC shown in FIG. 1 while the main control circuit SC is in the setting mode, the main control circuit SC One of the plurality of welding conditions stored based on the setting signal Wc is selected and reproduced to control the power of the main power supply circuit INV.

  Subsequently, when the setting / selection switch SW5 of the remote control device REC is set to the selection mode (closed), the setting / selection signal Sw5 becomes low level, and the welding current setting switch SW1 and the welding voltage setting switch SW2 are cut off. The welding condition selection switch SW3 is turned on, and the welding current set value Ir corresponding to the welding condition numbers 1 to 10 on the scale provided in the welding current setting device IR shown in FIG. 3 is input to the main control circuit SC.

  When the main control circuit SC enters the selection mode, the main control circuit SC is based on the welding current set value Ir corresponding to the positions 0 to 9 of the welding condition number (screen diagram) provided in the welding current setting device IR of the remote control device shown in FIG. The power of the main power supply circuit INV is controlled by selecting and reproducing one of a plurality of welding conditions including a combination of the stored welding current set value Ir and welding voltage set value Vr. Further, the welding voltage set value Vr may be used instead of the welding current set value Ir.

  FIG. 2 is a waveform diagram for explaining the operation of the first embodiment. In the same figure, (A) shows the activation signal Ts, (B) shows the setting / selection signal Sw5, (C) shows the inverted signal Nt, (D) Indicates a welding current setting signal Ir. Next, the operation will be described with reference to the waveform diagram of FIG.

  At time t = t1 shown in FIG. 2, when the setting / selection switch SW5 shown in FIG. 2 (B) is set to the setting mode (open) and the setting / selection signal Sw5 becomes the high level, the main control circuit SC changes to the setting mode. recognize. Subsequently, the welding current setting switch SW1 and the welding voltage setting switch SW2 shown in FIG. 1 are turned on and the welding condition selection switch SW3 is turned off.

  At time t = t1 to t2, an analog welding current set value Ir set by the welding current setter IR and an analog welding voltage set value Vr set by the welding voltage setter VR are input to the main control circuit SC. Is done.

  When the activation signal Ts shown in FIG. 2A becomes High level at time t = t2, the main control circuit SC sets the main power supply circuit INV based on the input welding current set value Ir and welding voltage set value Vr. Input to start power control.

  During the period of time t = t2 to t3, the main control circuit SC inputs the main power supply circuit INV based on the input welding current set value Ir and the welding voltage set value Vr and continues the power control.

  At time t = t3, when the activation signal Ts shown in FIG. 2A becomes a low level, the main control circuit SC stops the power control of the main power supply circuit INV. Subsequently, at time t = t4, when the setting / selection signal Sw5 shown in FIG. 5B is at the low level (selection mode), the main control circuit SC recognizes that it has changed to the selection mode, and the welding current setting switch SW1 and welding voltage setting switch SW2 are cut off and welding condition selection switch SW3 is turned on.

At time t = t4 to t5, when the setting / selection signal Sw5 shown in FIG. 2A becomes low level, the inversion signal Nt of the inverting circuit NT shown in FIG. The welding condition number (screen diagram) provided in the welding current setting device IR of the remote control device shown in FIG. 3, for example, the welding condition number (screen diagram) shown in FIG. The current set value Ir is input to the main control circuit SC.

  When the start signal Ts shown in FIG. 2A becomes High level at time t = t5, the main control circuit SC determines the stored welding current based on the welding current set value Ir corresponding to the welding condition number 2. One of a plurality of welding conditions consisting of a combination of the set value Ir and the welding voltage set value Vr is selected and reproduced to start the power control of the main power supply circuit INV.

  After time t = t5, the main control circuit SC continues power control of the main power supply circuit INV based on the regenerated welding conditions.

[Embodiment 2]
FIG. 4 is an electrical connection diagram of the arc welder according to the second embodiment of the present invention. In the figure, the same reference numerals as those in the electrical connection diagram of the first embodiment of the present invention shown in FIG. 1 perform the same operations, and thus the description thereof will be omitted and only different operations will be described.

  In the electrical connection diagram of the arc welder of the second embodiment shown in FIG. 4, a second welding condition selection switch SW4 is newly provided in addition to the welding condition selection switch SW3, and is arranged in the remote control device. When the setting / selection switch SW5 is set to the selection mode (closed) and the setting / selection signal Sw5 shown in FIG. 2B is at the low level (selection mode), the main control circuit SC recognizes the selection mode.

  Subsequently, when the setting / selection signal Sw5 becomes a low level (selection mode), the welding current setting switch SW1 and the welding voltage setting switch SW2 shown in FIG. 4 are cut off and the welding condition selection switch SW3 and the second welding condition are set. When the selection switch SW4 is turned on and the welding condition selection switch SW3 is turned on, a knob is set to, for example, 2 in the welding condition number (screen diagram) provided in the welding current setting device IR of the remote control device shown in FIG. Then, when the welding current set value Ir corresponding to 2 is input to the main control circuit SC and the second welding condition selection switch SW4 is turned on, the welding condition number (screen diagram) provided in the welding voltage setting device VR is displayed. For example, when 5 is set, the welding voltage set value Vr corresponding to 5 is input to the main control circuit SC, and the two A welding condition selection number is calculated by multiplying and adding a constant value (for example, (2 × 10) + 5 = 25), and one of a plurality of welding conditions stored in advance based on the calculated welding condition selection number. Is selected and reproduced to start the power control of the main power supply circuit INV.

It is an electrical connection diagram of the arc welder according to Embodiment 1 of the present invention. It is a timing diagram for demonstrating operation | movement of this invention of FIG. It is a screen figure of a remote control device with a selection function. It is an electrical connection diagram of the arc welder of Embodiment 2 of the present invention. It is an electrical connection figure of the arc welding machine of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Welding torch 2 Consumable electrode 3 Work piece 4 Feeding roll AC Commercial frequency AC power supply NT Inversion circuit INV Main power supply circuit IR Welding current setting device RE Remote control device REC Remote control device R Resistor SC Main control circuit SW1 Welding Current setting switch SW2 Welding voltage setting switch SW3 Welding condition selection switch SW4 Second welding condition selection switch SW5 Setting / selection switch VR Welding voltage setting device WC Welding condition selection circuit WG Welding power supply WR Welding condition changeover switch WS Welding condition setting / selection Circuit Nt Inversion signal Ir Welding current set value (Analog value)
Ts Start signal Vr Welding voltage setting value (analog value)
Wc Welding condition selection signal Sw5 Setting / selection signal

Claims (1)

A welding current setting device, a welding voltage setting device, and a setting / selection switch are formed, and the welding current setting device outputs a predetermined analog welding current setting value, and the welding voltage setting device sets a predetermined analog welding voltage setting. A remote control device that outputs a value and the setting / selection switch outputs a setting / selection signal, a main power supply circuit that supplies a predetermined power to a load, the welding current setting value, the welding voltage setting value, and the setting When a selection signal is input and the setting / selection signal is in the setting mode, the power of the main power circuit is controlled based on the welding current setting value and the welding voltage setting value, and the setting / selection signal is in the selection mode. when, formed from the combination of the welding current the welding current set value based on the welding current setting value corresponding to the position of the welding condition number provided in the setter and the welding voltage set value One of a plurality of welding conditions stored in advance, or the welding current set value corresponding to the position of the welding condition number provided in the welding current setting device and the welding condition provided in the welding voltage setting device A main control circuit that selects one of the plurality of welding conditions based on the welding voltage setting value corresponding to the position of the number, and controls the power of the main power supply circuit based on the selected welding condition ; An arc welding machine comprising:

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