JP4842604B2 - Display device for arc welding machine - Google Patents

Description

  The present invention relates to a display device that displays each welding condition of an arc welder.

  FIG. 5 is an electrical connection diagram of a display device 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. A main control circuit MC for controlling the power of the main power supply circuit INV, and a welding current value and a welding voltage value (not shown) supplied to the load during welding are displayed. After welding is completed, the welding current set value Ir and the above-mentioned welding current value are displayed. It is formed by a display device WLED that displays a welding voltage set value Vr (for example, using a 7-segment LED) and a display drive circuit ID that has a time function and controls the display device WLED.

  The remote control device RE is formed of a welding current setting device IR, a welding voltage setting device VR and an inching switch IS 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. A welding current set value Ir and an analog welding voltage set value Vr set at a variable terminal of the welding voltage setter VR are output, and the inching switch IS outputs an inching signal Is.

  FIG. 6 is a waveform diagram for explaining the operation of the prior art. In the same figure, (A) shows the start signal Ts, (B) shows the main control signal Ms, (C) shows the welding condition signal Mi, (D). Indicates the display drive signal Id. Next, the operation will be described with reference to the waveform diagram of FIG.

  At time t = t1 shown in FIG. 6, when the activation signal Ts shown in FIG. 6A becomes high level, the main control circuit MC outputs the main power supply drive signal Mc and starts output control of the main power supply circuit INV. At the same time, the main control signal Ms shown in FIG. Subsequently, when the main control signal Ms becomes High level, the display drive circuit ID turns on the display WLED by setting the display drive signal Id shown in FIG.

  At time t = t1 to t2, the main control circuit MC controls the output of the main power supply circuit INV based on the welding current set value Ir and the welding voltage set value Vr and inputs the welding condition signal Mi to the display WLED. . The indicator WLED displays a welding current value, a welding voltage value and a welding process (for example, an initial condition or a main condition) supplied to the load based on the welding condition signal Mi.

  At time t = t2 shown in FIG. 6, when the activation signal Ts shown in FIG. 6A becomes a low level, the main control circuit MC finishes the output control of the main power supply circuit INV, and FIG. The main control signal Ms shown is set to the Low level. Subsequently, when the main control signal Ms becomes the Low level, the display drive circuit ID starts the time period shown in FIG. 4C, and the display drive signal Id shown in FIG. Then, the lighting of the indicator WLED is continued. Subsequently, during a period of time t = t2 to t3, the welding current set value Ir, the welding voltage set value Vr, and the welding mode (for example, a welding method or a wire diameter) are displayed on the display WLED.

  At time t = t3, when the time period T2 ends in FIG. 6C, the display drive signal Id is set to the low level to turn off the display WLED.

  At time t = t4, when the activation signal Ts shown in FIG. 5A is set to a high level for a short period of time, the main control signal Ms shown in FIG. When the signal Ms becomes High level, the display drive circuit ID is set, and the display drive signal Id shown in FIG. 4D becomes High level for a predetermined time to turn on the display WLED.

  During welding standby at time t = t4 to t5, the indicator WLED is turned on, and the welding current set value, welding voltage set value, and welding mode can be confirmed.

  After the time t = t5, when the activation signal Ts shown in FIG. 5A is set to the high level again, the main control circuit MC outputs the main power supply drive signal Mc and restarts the output control of the main power supply circuit INV. Then, the main control signal Ms shown in FIG. At this time, the display drive circuit ID is set again, and the display drive signal Id shown in FIG. 4D continues to be at a high level, the indicator WLED is turned on, and the welding current value, welding voltage value, and welding process are displayed.

  As described above, the indicator WLED that has been turned off remotely can be turned on by the torch switch TS disposed on the welding torch at hand. Further, if the display drive circuit ID is reset by pressing any control switch of the welding power source WG (not shown), the indicator WLED can be turned on. Patent Document 1 discloses the above-described technique.

Japanese Patent Laid-Open No. 9-247772

  In the above-described prior art, after the welding operation is completed with the torch switch turned off and welding is completed, the indicator (7-segment LED) is turned off when a predetermined time has elapsed, thereby extending the life of the indicator (7-segment LED). Was realized. However, when the indicator is turned off and turned on again, the operator must return to the place where the welding power source is located because the indicator will not light up unless some control switch or the like of the welding power source is newly operated. I had to.

  As an improvement measure, there is a method in which the operator presses the torch switch of the welding torch to turn on the indicator that is turned off. However, in the above method, an unnecessary no-load voltage is generated between the wire and the workpiece, and further, the wire is fed to deteriorate the startability at the start of welding.

  Then, in this invention, it is providing the display apparatus of the arc welding machine which solves the subject mentioned above.

In order to solve the above-described problem, the first invention is to predetermine a main power supply circuit for supplying predetermined power to a load, a torch switch for instructing start / stop, and a time for an operator to press the torch switch. discriminated outputs time or more when the start command signal, the determination outputs a display command signal when less than time, stops the output of the start command signal and stops pressing the torch switch after the determination time has elapsed A start / display determination circuit that performs output control of the main power supply circuit and outputs a main control signal when the start command signal is input, and stops the output control and stops the main control when input of the start command signal stops. time and main control circuit for stopping the output of the signal, and a display device for displaying the welding condition, the input of the main control signals to light the indicator and the main control signal is input to stop Starts operation and turns off when a predetermined time period elapses. When the display command signal is input, starts the timed operation and turns on the display until the time period elapses. The main control is performed during the time period. A display drive circuit for an arc welding machine, comprising: a display drive circuit that turns on the display in response to the main control signal when a signal is input again .

According to a second aspect of the present invention, there is provided an inching switch for instructing feeding / stopping, a main power supply circuit for supplying predetermined power to a load, a torch switch for instructing starting / stopping, and a time for an operator to press the inching switch. Inching / display discriminating circuit that outputs an inching command signal when a predetermined discriminating time is exceeded and outputs a display command signal when the discriminating time is less than the discriminating time, and when the start signal is input, the main power supply circuit is output and controlled. When the start signal is output and the input stops, the output control of the main power supply circuit is stopped and the output of the main control signal is stopped. When the inching command signal is input, the output control of the main power supply circuit is controlled. a main control circuit for feeding the wire is stopped, a display for displaying the welding condition, the main control is turned the display and the main control signal is input When the input of the signal is stopped, it starts a timed operation and turns off when a predetermined time limit elapses.When the display command signal is input, the timed operation starts and the display is turned on until the time limit time elapses. A display drive circuit for an arc welding machine, comprising: a display drive circuit that turns on the display in accordance with the main control signal when the main control signal is input again during the time limit .

  According to the first aspect of the invention, no load voltage between the wire and the workpiece does not occur even when the operator presses the torch switch to light the display. Furthermore, since the wire is not fed, the startability can be improved.

  According to the second aspect of the present invention, even if the operator presses the inching switch of the remote control device at hand to turn on the display device, the wire feeding is not performed, so the startability can be improved.

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

  The start / display determination circuit TC shown in FIG. 1 inputs a start command signal To to the main control circuit MC when the start signal Ts output by pressing the torch switch is longer than a predetermined determination time, and the start signal Ts When it is less than the determination time, it is input to the display drive circuit ID as the display command signal Tc.

  The display drive circuit ID has a time limit function, and receives the main control signal Ms, the display command signal Tc, and the reset signal Mr. When the main control signal Ms becomes High level, the display drive signal Id becomes High level, When the control signal Ms becomes Low level, the display drive signal Id is set to Low level and output after a predetermined time period T2 has elapsed. When the display command signal Tc and the reset signal Mr are input, the display drive signal Id is set to a high level.

  FIG. 2 is a waveform diagram for explaining the operation of the first embodiment. In the same figure, (A) shows the start signal Ts, (B) shows the start command signal To, (C) shows the display command signal Tc, (D) Indicates the main control signal Ms, FIG. 5E shows the welding condition signal Mi, and FIG. 4F shows the display drive signal Id. Next, the operation will be described with reference to the waveform diagram of FIG.

  When the activation signal Ts shown in FIG. 6A becomes High level at time t = t1 shown in FIG. 6, the activation / display determination circuit TC determines the time of the high level of the activation signal Ts as a predetermined determination time. It is discriminated whether it is equal to or greater than T1, and when it is equal to or greater than the discriminating time T1, at time t = t2, the activation command signal To shown in FIG. 5B is set to High level and input to the main control circuit MC. To do. When the activation command signal To becomes High level, the main control circuit MC outputs a main power drive signal Mc based on the welding current set value Ir and the welding voltage set value Vr, and starts output control of the main power circuit INV.

  Subsequently, at time t = t2, when the main control signal Ms shown in FIG. 2D becomes High level, the display drive circuit ID sets the display drive signal Id shown in FIG. Lights up.

  At time t = t2 to t3, the main control circuit MC controls the output of the main power supply circuit INV based on the welding current set value Ir and the welding voltage set value Vr, and inputs the welding condition signal Mi to the display WLED. The indicator WLED displays a welding current value, a welding voltage value and a welding process (for example, an initial condition or a main condition) supplied to the load based on the welding condition signal Mi.

  When the start command signal To shown in FIG. 2B becomes low level at time t = t3 shown in FIG. 2, the main control circuit MC stops the output control of the main power supply circuit INV, and FIG. The main control signal Ms shown is set to the Low level. When the main control signal Ms becomes the Low level, the display drive circuit ID starts the time limit, and the display drive signal Id shown in FIG. 4F is set to the High level for the period T2 to keep the display WLED on. Subsequently, during the period from time t = t3 to t4, the welding current set value Ir, the welding voltage set value Vr, and the welding mode (for example, a welding method or a wire diameter) are displayed on the display WLED.

  At time t = t4, when the time period T2 shown in FIG. 2F ends, the display drive signal Id is set to the low level, and the display WLED is turned off.

  At time t = t5 shown in FIG. 2, when the activation signal Ts shown in FIG. 2A becomes a high level, the activation / display determination circuit TC determines whether the activation signal Ts is equal to or longer than the determination time T1. However, when it is less than the discrimination time T1, at time t = t6, it is input to the display drive circuit ID as the display command signal Tc shown in FIG.

  At time t = t6, the display drive circuit ID is reset, and the display drive signal Id shown in FIG. 4F becomes High level, and the display WLED is turned on for the period T2. Subsequently, during welding standby at time t = t6 to t7, the welding current set value Ir, the welding voltage set value Vr, and the welding mode are displayed on the display WLED.

  After the time t = t7, when the activation signal Ts shown in FIG. 5A is again set to the High level, the activation / display determination circuit TC determines whether the activation signal Ts is greater than or less than the determination time T1, When the determination time is equal to or longer than T1, the start command signal To is set to the high level, and thereafter the same operation as described above is repeated.

[Embodiment 2]
FIG. 3 is a connection diagram of the display device 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.

  The inching / display discriminating circuit IC shown in FIG. 3 inputs the inching command signal Io to the main control circuit MC when the inching signal Is output from the inching switch IS is equal to or longer than the discriminating time T1, and the inching signal Is is used as the discriminating time. When it is less than T1, it is input to the display drive circuit ID as the display command signal Ic.

  FIG. 4 is a waveform diagram for explaining the operation of the second embodiment. In the same figure, (A) shows the start signal Ts, (B) shows the inching signal Is, (C) shows the inching command signal Io, and (D) in FIG. The display command signal Ic is shown, FIG. 5E shows the main control signal Ms, FIG. 4F shows the welding condition signal Mi, and FIG. 4G shows the welding drive signal Id. Next, the operation will be described with reference to the waveform diagram of FIG.

  At time t = t1 shown in FIG. 4, when the start signal Ts shown in FIG. 4A is at a high level, the main control circuit MC determines the main power drive signal based on the welding current set value Ir and the welding voltage set value Vr. Mc is output to control the main power supply circuit INV to start output control, and the main control signal Ms shown in FIG. Subsequently, when the main control signal Ms becomes High level, the display driving circuit ID sets the display driving signal Id shown in FIG. 5G to High level to light the display WLED.

  At time t = t1 to t2, the main control circuit MC controls the output of the main power supply circuit based on the welding current set value Ir and the welding voltage set value Vr and inputs the welding condition signal Mi to the display WLED. The indicator WLED displays a welding current value, a welding voltage value and a welding process (for example, an initial condition or a main condition) supplied to the load based on the welding condition signal Mi.

  When the activation signal Ts shown in FIG. 4A becomes low level at time t = t2 shown in FIG. 4, the main control circuit MC stops the output control of the main power supply circuit INV, and shown in FIG. The main control signal Ms is also set to the low level. When the main control signal Ms becomes the Low level, the display drive circuit ID starts the time limit, and the display drive signal Id shown in FIG. 4G is set to the High level for the period of the time T2, and the lighting of the display WLED is continued. Subsequently, during a period of time t = t2 to t3, the welding current set value Ir, the welding voltage set value Vr, and the welding mode (for example, a welding method or a wire diameter) are displayed on the display WLED.

  At time t = t3, when the inching switch IS is pushed and the inching signal Is shown in FIG. 4B becomes high level, the inching / display determination circuit TC determines whether the inching signal Is is greater than or less than the determination time T1. When the determination time is equal to or longer than the determination time T1, the inching command signal Io is set, and at time t = t4, the inching command signal Io is set to High level and input to the main control circuit MC. When the inching command signal Io becomes High level, the main control circuit MC feeds the wire 2 at a predetermined speed.

  When the inching switch IS is pushed again at the time t = t5 shown in FIG. 4 and the inching signal Is shown in FIG. 4B becomes a high level, the inching / display discrimination circuit IC determines that the inching signal Is exceeds the discrimination time T1. When the time is less than the determination time T1, at time t = t6, the display command signal Ic is input to the display drive circuit ID.

  At time t = t6, the display drive circuit ID is reset and the display drive signal Id shown in FIG. 4G becomes High level, and the display WLED is turned on for the period T2. Subsequently, during welding standby at time t = t6 to t7, the welding current set value Ir, the welding voltage set value Vr, and the welding mode are displayed on the display WLED.

  After the time t = t7, when the start signal Ts shown in FIG. 5A becomes high level, the main control circuit MC outputs the main power supply drive signal Mc based on the welding current set value Ir and the welding voltage set value Vr. Then, control of the output of the main power supply circuit INV is started, and thereafter the same operation as described above is repeated.

It is an electrical connection figure of the display apparatus of the arc welder which concerns on Embodiment 1 of this invention. FIG. 6 is a waveform diagram for explaining the operation of the first embodiment. It is an electrical connection figure of the display apparatus of the arc welding machine which concerns on Embodiment 2 of this invention. FIG. 6 is a waveform diagram for explaining the operation of the second embodiment. It is an electrical connection figure of the display apparatus of the arc welding machine of a prior art. It is a wave form diagram explaining operation | movement of a prior art.

Explanation of symbols

1 Welding torch 2 Wire (consumable electrode)
3 Workpiece 4 Feeding Roll AC Commercial Frequency AC Power Supply IC Inching / Display Discrimination Circuit ID Display Drive Circuit IR Welding Current Setter IS Inching Switch INV Main Power Circuit MC Main Control Circuit RE Remote Control Device TC Start / Display Discrimination Circuit TS Torch switch VR Welding voltage setting device WG Welding power supply WLED indicator

Ic, Tc Display command signal Id Display drive signal Io Inching command signal Ir Welding current set value Ts Start signal To Start command signal Vr Welding voltage set value Mc Main power drive signal Mi Welding condition signal Mr Reset signal Ms Main control signal

Claims (2)

A main power supply circuit that supplies predetermined power to the load, a torch switch that commands start / stop, and a start command signal that is output when an operator presses the torch switch for a predetermined determination time or longer. A display command signal is output when the time is less than the time, and when the start command signal is input , the start / display determination circuit stops the output of the start command signal when the pressing of the torch switch is stopped after the determination time has elapsed. Outputs the main power supply circuit and outputs a main control signal. When the input of the start command signal stops, the main control circuit stops the output control and stops outputting the main control signal, and displays welding conditions. a display unit for, when the timed time input a predetermined started timed operation is stopped in the main control signal so that lighting the display by entering the main control signal has elapsed When the display command signal is input, the timed operation is started and the display is turned on until the timed time elapses. When the main control signal is input again during the timed time, the main control signal is A display device for an arc welding machine, comprising: a display drive circuit for lighting the display. Inching switch for instructing feeding / stop, main power supply circuit for supplying predetermined power to the load, torch switch for instructing starting / stopping, and time for the operator to press the inching switch is longer than the predetermined determination time An inching / display discriminating circuit that outputs an inching command signal at the time of less than the discriminating time, and an output control of the main power supply circuit when a start signal is input, and a main control signal is output and the start When the input of the signal is stopped, the output control of the main power supply circuit is stopped and the output of the main control signal is stopped. When the inching command signal is input, the output control of the main power supply circuit is stopped and a wire is sent. a main control circuit for supplying a display for displaying the welding conditions, the input is stopped for the main control signal to light the indicator and the main control signal is input Then, a timed operation is started and turned off when a predetermined time has elapsed, and when the display command signal is input, the timed operation is started and the display is turned on until the timed time elapses. A display device for an arc welding machine, comprising: a display drive circuit that turns on the display in accordance with the main control signal when the main control signal is input again .

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