JP2890100B2 - Resistance welding control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistance welding control apparatus capable of coping with a large number of welding schedules with one unit.

[0002]

2. Description of the Related Art FIG. 14 shows a front panel of a conventional resistance welding control apparatus of this kind. This front panel 2
00 is provided with a number of keys and indicators, which are divided by function or setting content into the welding schedule section 202,
Cycle section 204, pressurized N0. Section 206, hit point monitoring section 2
08, a current section 210, a monitor I section 212, a step-up section 214, a program section 216, an operation section 218, a monitor II section 220, and a welding section 222.

In this resistance welding control device, a program key 224 is pressed to input various set values for each welding schedule. This program key 224
Key is pressed to enter the program mode. Then, when the "condition input" key 226 is pressed, the "condition input"
8 flashes and the code of the welding schedule can be set and input. Under this state, the "+1 data input" key 230 or the "-1 data input" key 232 is operated.
Numbers for which welding schedules can be set (for example, 1-1
For example, “13” is set (selected) as shown in FIG.

Then, when a corresponding key ("squeeze" key 234) is pressed to input a desired set value (for example, squeeze time TSQ), a corresponding display element ("squeeze display") immediately above the key is pressed. Since the element 236) blinks, the "+1 data input" key 230 or the "-1 data input" key 232 is operated to input the set value.
Such an operation is repeated, and all desired setting values are input by key.

After the same key input operation as described above is performed for other welding schedules, the operation key 23 is pressed.
Pressing 8 switches from the program mode to the operation mode.

In the operation mode, when a start signal is sent from a resistance welding machine or the like before the execution of the welding schedule, the welding schedule unit 2 is displayed on the front panel 200.
02, the code (number) of the welding schedule to be executed is displayed on the "condition input" display element 228, the set value of the squeeze time TSQ is displayed on the "squeeze" key 234 of the cycle section 204, and the current section is displayed. The first "current" display element 240 of 210 displays the respective set values such that the set values of the maximum current value, the current value I, and the current value II are selectively displayed. Then, when the resistance welding is started, the pressurizing and welding process is displayed on the “pressurizing N0.” Display element 242 of the pressurizing N0. Unit 206, the “weldable” display lamp 244 of the monitor II unit 220, and the like. .

When the resistance welding is normally performed, a predetermined monitor value is displayed on front panel 200, and, for example, maximum current value, current value I, current value are displayed on first “current” display element 240 of current section 210. II measurements are displayed selectively
On the “monitor I” display element 246 of the monitor I section 212, the measured values of the maximum energization angle and the positive and negative current fluctuation values are selectively displayed. Thereafter, in this state, it waits for the next schedule signal.

However, if an abnormal situation occurs, for example, a non-energized situation, the "non-energized" display lamp 248 of the monitor II unit 220 lights up, and the abnormal situation is displayed. In such a case, when the "reset" key 250 is pressed, the lamp 248 is turned off, the abnormal display is released, and the system waits for the next start signal. Then, when the next start signal is sent, the same operation as described above is repeated.

[0009]

As described above, in the conventional resistance welding control device, the program key 224 is first pressed to switch to the program mode, and then, for each of the desired welding conditions, the corresponding setting item selection key ( For example, the user presses a “squeeze” key 234), and then presses a “+1 data input” key 230 or a “−1 data input” key 232 until the set value of the selected setting item (welding condition) becomes a desired value. After ending the setting operation, the operation key 238 is pressed to switch to the execution mode,
It had to wait for an external start signal. In other words, at least four types of keys (the program key 224, the setting item selection key, the data input keys 230 and 232, and the operation key 238) have to be pressed in order to input the setting of the welding condition.

As described above, in the conventional resistance welding control device, the setting and input of the welding conditions require a number of steps, so that the operation is troublesome for the worker in the welding work place. Particularly, a problem in an actual workplace is that a “+1 data input” key 230 or a “−1 data input” key 232 is used.
Press the key to enter the desired setting value.
It is easy to forget the operation of pressing 38. In this case, even if a start signal is sent from the resistance welding machine main body side, the apparatus does not operate, and welding welding is not performed. As a result, there is a problem that the workpiece (work) flows through the line without being resistance-welded to a predetermined location.

In the conventional resistance welding control device, a predetermined measured value or monitor value is displayed on the front panel 200 immediately after one resistance welding is performed.
On the first “current” display element 240 of 0, the measured values of the maximum current value, the current value I, and the current value II are alternatively displayed. Any of these three monitor values (the maximum current value, the current value I, and the current value II are the first “current” display elements 2
40 is displayed depending on which of the corresponding selection keys "maximum current" key 250, "current I" key 252, and "current II" key 254 was selected before the start of the current resistance welding. It depends. For example, "current I" key 2
If 52 has been pressed, the LED lamp 252a on its left shoulder is lit, and after the end of resistance welding, the first
The “current” display element 240 displays the measured value of the current value I.

However, if any other key, for example, the "maximum current" key 250 is pressed in this state, the left shoulder L of the operated "maximum current" key 250
When the ED lamp 250a is turned on, the first “current”
The display contents of the display element 240 are switched to the set value of the maximum current value, and the display contents of all the other display elements are also switched to the set values.

That is, in the conventional resistance welding control device, the display mode of the device automatically switches to the measured value display mode after each resistance welding is completed, but when any key is pressed, the key operation is performed. In response, the mode is switched to the set value display mode, and once the mode is switched to the set value display mode, the mode is not returned to the measured value display mode until the next resistance welding is executed. Therefore, in the case of the above example, even if the operator wants to see the measured value of the current value I again after pressing the "maximum current" key 250, it cannot do so. In addition, in order to monitor not only the measured value of the current value I but also the maximum current value, the resistance welding must be performed again under the same conditions, which consumes time and labor.

Since this kind of resistance welding control apparatus can cope with many welding schedules by one unit, there is a chance that various setting values are input to the apparatus from the operator side, There are many occasions for issuing various abnormality alarms, and simplicity is required on the operation side, and discrimination of individual display contents is required on the display side.

The present invention has been made in view of the above problems, and a first object of the present invention is to make it possible to input a desired set value for a desired welding condition with a minimum necessary key operation, thereby simplifying the operation. Welding control device that, when a start signal is input from the outside, reliably executes resistance welding based on various set values at that time and prevents undesired welding non-energization. Is to provide.

It is a second object of the present invention to provide a resistance welding control apparatus which allows various measured values obtained in the immediately preceding resistance welding to be repeatedly or selectively observed.

A third object of the present invention is to provide a resistance welding control apparatus which, when an abnormal situation is detected in the apparatus, effectively displays the abnormal situation so that a required measure can be taken promptly and reliably. To provide.

A fourth object of the present invention is to make it possible to set a plurality of modes for the counter value of the number of welding points,
Another object of the present invention is to provide a resistance welding control device which, when the counter value of the number of welding points reaches a set value of each mode, informs a nearby worker or the like of that fact.

[0019]

In order to achieve the above first object, a first resistance welding control apparatus of the present invention sets various welding conditions and displays measured values for predetermined welding conditions. In the resistance welding control device described above, one set corresponding to each setting item of the welding schedule or welding condition is set.
Select keys are provided and respond to key operations of the corresponding select keys.
Setting item selecting means for operating and enabling setting input for each setting item , each of which corresponds to any setting item or measurement item, and Display means comprising a number of display elements arranged in a predetermined positional relationship, and first and second means for incrementing and decrementing setting values for setting items for which setting input is enabled by the setting item selecting means, respectively. Data input means comprising data input keys, setting value storage means for storing set values of respective setting items for each set welding schedule, and setting items which are enabled for setting input by the setting item selecting means. Setting for updating the set value in the storage means corresponding to the set item each time a key input from the data input means is made, in accordance with the key input Update means, start signal input means for inputting a start signal specifying one of the welding schedules from an external device, and in response to the start signal input to the start signal input means, Welding control means for executing a welding sequence based on the set value in the storage means corresponding to the specified welding schedule.

In order to achieve the second object, the second resistance welding control device according to the present invention is the first resistance welding control device, wherein the first resistance welding control device performs welding of a predetermined measurement item during execution of the welding sequence. Welding condition measuring means for measuring conditions;
A measured value storage unit that holds a measured value obtained by the welding condition measuring unit in the immediately preceding welding sequence, and the display corresponding to the measured value obtained by the welding condition measuring unit in the immediately preceding resistance welding. A measurement value display control means for displaying on the element, and a measurement value display mode for displaying the measurement value obtained by the welding condition measuring means in the immediately preceding welding schedule on the corresponding display element. And a measurement value display mode selecting means for switching to the mode.

In order to achieve the third object, a third resistance welding control device according to the present invention is the first resistance welding control device, wherein the first resistance welding control device displays a predetermined abnormal state in the device as an alarm. Alarm display means is provided, and when the predetermined abnormal state is detected, only the alarm display means is turned on and at the same time, all other display elements are turned off.

In order to achieve the fourth object, a fourth resistance welding control device according to the present invention, in the first resistance welding control device, sets a plurality of modes for the counter value of the number of welding points in the first resistance welding control device. And a buzzer means for generating a different buzzer sound according to the mode when the counter value of the number of welding points reaches the set value of each mode.

[0023]

In the first resistance welding control apparatus, the set values of the welding conditions are set for one or a plurality of welding schedules only by operating the selection key of the setting item selection means and the data input key of the data input means. Is entered. In this setting input operation, each time the data input key is operated, the set value data stored in the set value storage means is updated, and an external start signal is accepted at any time (that is, the execution mode is switched to the execution mode). Enter) Standby state is taken. When the start signal is input, the set values of the welding conditions of the welding schedule specified by the start signal are read from the set value storage means, and the resistance welding control means executes the welding sequence according to the set values.

In the second resistance welding control device, the welding condition measured values of the predetermined measurement items obtained by the welding condition measuring means are stored in the measured value storage means, and each is controlled by the display control of the measured value display control means. Is displayed on the display element. When any setting item selection key is pressed in the measured value display mode, the mode is switched to the setting input mode, and the set value is displayed on the display element. However, the measured value data in the immediately preceding welding sequence is stored in the measured value storage means, and when the measured value display mode selecting means is operated, the display returns to the measured value display mode again, and each display element is again measured. Displays the value.

In the third resistance welding control device, only the alarm display means is turned on while all other display elements are turned off, so that an operator or the like can see or recognize an abnormal situation at a glance by the contrast effect. Can be.

In the fourth resistance welding control device, when the counter value of the number of welding spots reaches the set value of each mode, a buzzer sound specific to each mode is emitted. Can be recognized.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIGS. 1 and 2 are a front view and a perspective view showing a panel structure of a front portion of a resistance welding control device 10 according to an embodiment of the present invention. 3 to 6 are partially enlarged views showing each part of the front panel of this device.

As shown in FIG.
Is a so-called vertical unit that is long in the vertical direction. A number of keys and indicators arranged on the front panel 12 are divided into the following eight sections (1) to (8) according to functions or setting contents.

(1) Schedule No. setting / display unit 14

The schedule N is located at the top of the front panel 12.
0. A setting / display unit 14 is provided. Here, a "condition input" key 16 for enabling or selecting the setting input of the code (number) of the welding schedule, a "condition" display element 18 for displaying the setting input or the code of the selected welding schedule are provided. Is arranged.

(2) Status display section 20

A status display unit 20 is provided below the schedule No. setting / display unit 14. As shown in FIG. 3 (partially enlarged view), here, a plurality of display elements 22 to 32 formed of LED lamps for displaying various states in the apparatus are arranged. For example, when the energization angle becomes larger than the set energization angle, the energization angle becomes abnormal and the "current attention" display element 30 is turned on.

(3) Welding sequence display section 34

A welding sequence display section 34 is provided below the status display section 20. Fig. 4 (Partial enlarged view)
As shown in FIG. 36, FIG. 36 schematically shows a cycle / current waveform in one welding sequence, and a plurality of display elements composed of LED lamps representing each part of the sequence are shown below FIG. SQ, W1,... Are arranged along the time axis.

That is, in order from the left, the squeeze time T
A "squeeze" display element SQ for displaying SQ, a "weld I" display element W1 for displaying the first weld time TW1, a first
"Cool I" display element C1, which displays cool time TC1,
"Up-slope" to display up-slope time TS1
A display element S1, a "weld II" display element W2 for displaying the second weld time TW2, a "cool II" display element C2 for displaying the second cool time TC2, and a "weld III" display element for displaying the third weld time TW3 W3, a "down slope" display element S2 for displaying the down slope time TS2,
"Hold" display element HD that displays hold time THD
And an "off" display element OF for displaying the off-time TOF.

(4) Cycle setting / display unit 38

Below the welding sequence display section 34, a cycle setting / display section 38 is provided. FIG.
As shown in the (enlarged partial view), here, a “cycle” key 40 for enabling or selecting the setting input of the number of cycles for each part (squeeze, weld I, cool I,...) Of the welding sequence and "Cycle" display element 42
Is arranged. The “cycle” display element 42 is formed of, for example, a 2-digit 7-segment LED.

(5) Welding current setting display / measured value display unit 4
4

A welding current setting / measured value / display unit 44 is provided below the cycle setting / display unit 38. As shown in FIG. 4 (partially enlarged view), the “current” for enabling or selecting the setting input of each welding current value at three welding times (TW1, TW2, TW3) in the welding sequence is included here. "Value" key 46 and "current value" display element 4
8 are arranged. The "current value" key 46 and the "current value" display element 48 are also used to display the measured value of each weld time. "Current value" display element 48
Consists of, for example, a three-digit seven-segment LED.

In FIG. 4, a cursor key 50 is arranged on the left of the cycle setting / display section 38. Each time the cursor key 50 is pressed, the setting inputtable portion in the welding sequence shifts one by one to the right, and the display elements SQ, W1,...

(6) Monitor setting / display unit 52

The welding current setting display / measured value display section 44
A monitor setting section 52 is arranged below and adjacent to the monitor setting section 52. FIG.
As shown in the (enlarged partial view), here, an “energization angle” key 54 for enabling or selecting the setting input of the energization angle monitoring value and the setting of the welding current monitoring value (upper limit value, lower limit value) are set. "+% Setting" to enable or select the input respectively
A key 56, a "-% setting" key 58, and a "monitor value" display element 60 for displaying a set value or a selected monitor value (a conduction angle monitor value, a welding current upper limit value or a lower limit value) are displayed. Have been. LED elements 54a, 58a, and 60a that light up when the keys are pressed are attached to the left shoulders of the keys 54, 58, and 60, respectively. The “monitor value” display element 60 is, for example, a three-digit seven-segment L
It consists of an ED element.

(7) Data counter setting / display unit 62

Below the monitor setting / display section 52,
A data counter setting / display unit 62 is provided.
As shown in FIG. 6 (partially enlarged view), here, seven modes described in the mode table 76: 0: “step-up count”, 1: “step-up rate”, 2: “total counter”, 3: "Rotation point counter", 4: "Production counter", 5: "Transformer turn ratio", 6: "± judgment input /
A “select” key 64 for enabling or selecting a setting input for any one of “OFF”, a “mode” display element 70 for displaying a code (number) of the set and input mode, A "data" display element 72 for displaying the input data selected or selected, and a cursor key 66 for designating or selecting the digit of the data to be input.
A "Step No." key 68 for enabling or selecting the setting input of the step-up No., and a "Step No." display element 74 for displaying the value of the step-up No. set and input. Is arranged. The “mode” display element 70 and the “NO.” Display element 74 are, for example, one-digit seven-segment LED elements, and the “data” display element 72 is, for example, a four-digit seven-segment LED element.

Here, step-up means increasing the welding current stepwise. That is, when resistance welding is repeated, the tip surfaces of the welding electrodes 144A and 144B gradually wear and increase, and the current density of the welding current supplied to the material to be welded 146 decreases. (Step-up count), the welding current is increased at a predetermined ratio (step-up rate) to compensate for electrode wear.

The total counter is a preset value of the total number of hit points. The hit point counter is a preset value of a desired number of hit points, and is normally set as the number of welding hit points for one work (material to be welded) 146. Production counter
Usually, it is set as a preset value of the production quantity relating to welding of the work 146. When the number of hit points reaches each preset value of the total counter, the hit point counter, or the production counter, a counter alarm process described later is performed, and different buzzer sounds are generated.

Below the "Step No." key 68, a "measurement value display" key 78 for switching the display mode of the apparatus to the measurement value display mode is arranged, as will be described later. The left shoulder of the "measurement value display" key 78 is displayed when the key is pressed to switch to the measurement value display mode, or when one welding sequence is completed to switch to the measurement value display mode ( LED lamp 78 that lights up during the measurement value display mode)
a is attached. A “count reset” key 80 for resetting each count value of the total counter, the hit point counter, and the production counter is arranged below the “measurement value display” key 78.

(8) Data input unit 82

At the bottom of the front panel 12, there is provided a data input section 82 for key inputting any data such as set values. As shown in FIGS. 1 and 2, here, a “+1 data input” key 84 for incrementing the value of each setting item enabled or selected by the keys of the above-mentioned setting units by +1 and A "-1 data input" key 86 for decrementing by -1 is arranged. A power-on switch 88 is disposed on the left of the data input unit 82.

As shown in FIG. 2, the front panel 12 has a rotatable dustproof cover 90 made of, for example, a transparent acrylic plate.
Thereby, it is protected from surrounding dust in a substantially sealed state.

In FIG. 1, the lower operation panel 92 provided below the front panel 12 protrudes from the dust cover 90 and is always exposed. On the lower operation panel 92, keys frequently used during a welding operation, for example, a "reset" key 93, a "count" key 94, a "pressure" key 95, and a "weld on / off" key 96 are arranged. Have been. On the left shoulder of the latter three keys 94, 95, 96, LED lamps 94a, which are turned on when the keys are operated,
95a and 96a are respectively attached.

FIG. 7 shows a system configuration of the resistance welding control device 10 of the present invention. The internal bus 100 includes a CPU (Central Processing Unit) 102, a RAM (Random Access Memory) 104, a ROM (Read Only Memory) 106, a reference counter 108, a panel controller 110, and an input / output interface circuit (I / O). ) 112, A / D converter 114
Is connected.

The CPU 102 controls the operation of each component and the entire apparatus in accordance with a control program, a display program, a key input routine, and the like stored in the ROM 106. And various calculations such as comparison judgment of.

The RAM 104 temporarily stores data such as various calculation results and measured values obtained by the CPU 102, and also stores a schedule code and a set value which are set and input from a front panel key (panel key) for each welding schedule. Are stored in a predetermined memory address in association with each other.

The panel controller 110 is a CPU
2 has a buffer memory for storing the set value data or measured value data sent from the device 2, and distributes and displays the data to the corresponding panel display elements.

The reference counter 108 generates a reference clock. The I / O 112 transfers the control signal sent from the CPU 102 to the thyristor firing circuit 116, receives the start signal from the resistance welding machine, and
It operates to send to U102. Further, a buzzer 113 is attached to the back of the apparatus, for example, and the buzzer 113 is connected to the CPU 102 via the I / O 112. The A / D converter 114 is used for the waveform restoration circuit 1
18 or an analog welding measurement signal is input from the waveform amplification circuit 120, and the input analog signal is converted into a digital signal and sent to the CPU 102.

The pressurizing output selecting section 122 supplies the AC power supply voltage (for example, 1) to the pressurizing valve corresponding to the code of the pressure No. sent from the CPU 102 according to the code.
00V). The control power supply unit 124 inputs an AC power supply voltage via the control power supply transformer 126 and supplies a predetermined operation power supply voltage to each unit in the device. Phase detection circuit 1
Reference numeral 28 inputs the secondary voltage of the synchronizing transformer 130 to which the commercial power supply voltage E for welding is input to the primary side, and supplies a synchronization signal or a timing signal synchronized with the commercial frequency to each unit in the system. The power supply voltage detection unit 132 detects a change in the welding power supply voltage E via the synchronization transformer 130 and supplies the A / D converter 114 with a compensation voltage for compensating for the change.

Incidentally, 134A and 134B are a pair of thyristors constituting a contactor, 136 is a welding transformer,
38 is a current transformer for measuring the primary side welding current;
0 is a toroidal coil for measuring the secondary welding current, 142
Is a primary feedback / secondary feedback switching circuit, 144A and 144B are welding electrodes, and 146 is a material to be welded.

Next, the operation of the resistance welding control apparatus according to the present embodiment, particularly
The processing operation of 102 will be described.

FIG. 8 shows the processing operation in the setting input mode. When any setting item selection key on the front panel 12 is pressed, the apparatus switches to the setting input mode. When the mode is switched to the setting input mode, the setting value of each setting item stored (registered) in the memory (RAM 104) at that time is displayed on the display element of each setting item (step [1]).

In this case, one display element corresponding to a plurality of setting items is set to the currently selected setting item, that is, the setting of the corresponding display element or the setting item whose display lamp is lit. Displays the value. For example, when the "weld I" display element W1 is lit on the welding current setting / measurement value display section 44, the "current value" display element 4
8 shows the set value of the welding current value for the first weld time TW1. When the LED lamp 56a at the left shoulder of the “+% setting” key 56 is lit on the monitor setting / display unit 52, the set value of the welding current upper limit value is displayed on the “monitor” display element 60.

In a normal setting input operation, a “condition input” key 1 is used to first set (select) a welding schedule.
6 is pressed. When this key 16 is pressed, the "condition" display element 18 flashes, and a code for the welding schedule can be set and input. When the "+1 data input" key 84 or the "-1 data input" key 86 is pressed in such a state, the code of the welding schedule is incremented or decremented each time (steps [4] and [5]).

After the welding schedule code is determined, the same operation as described above is repeated for each setting item, whereby the set values of all welding conditions for each welding schedule are input or changed (step [1]). ],
[2], [4], [5], [7]). Each time the selected setting item selection key is pressed again, the key 8
The digit of the set value which is the target of the key input (increment, decrement) by 4,86 is shifted by one.

After the setting input operation is completed, when a start signal is sent from the outside (the resistance welding machine body), the operation mode is entered from that point (step [6]).

When the "measurement value display" key 78 is depressed between setting inputs (step ([3])), the mode is switched to a measurement value display mode described later.

FIG. 9 shows the processing operation in the operation mode. In the operation mode, the received start signal is first decoded,
The welding schedule specified by the start signal is read (step [8]). Then, the schedule code and the set value for the welding schedule are stored in the RAM 10.
4 and display them on the corresponding display elements (step [9]).

After each set value is displayed on the front panel 12 as described above, resistance welding (welding sequence) is executed according to the welding schedule specified by the start signal (step [10]). In this resistance welding, the CPU
The control unit 102 controls each welding condition so as to match the set value. For example, regarding the welding current, the power supply voltage fluctuation compensation control based on the voltage detection signal from the power supply voltage detection unit 132, the current transformer 138 and the waveform amplification circuit 14
The primary feedback constant current control based on the primary current detection signal from the second or the secondary feedback constant current control based on the secondary current detection signal from the toroidal coil 140 and the waveform restoration circuit 118 is performed.

When the resistance welding is started, each display element on the front panel 12 is turned off once. However, in the welding sequence display section 34, the display elements SQ, W1,... Sequentially scan and light up as the sequence progresses to display the progress. Further, the CPU 102 calculates each measurement value for the welding condition of each measurement item based on the welding measurement signal from each unit.

When the welding sequence is completed as described above, the CPU 102 determines the welding result of the current resistance welding based on the measured values, the sensor output signals from the respective parts, and the like (step [11]). When the determination is normal, the mode is switched to the measurement value display mode. When the determination is abnormal, an abnormality alarm processing routine (step ([15])) described later is executed.

In the measured value display mode, each measured value obtained this time, that is, the immediately preceding resistance welding is stored in a memory (RAM 104).
And is displayed on each corresponding display element (step [12]). Even in this case, the measured value of the currently selected measurement item is displayed on the display element corresponding to a plurality of measurement value items. For example, as described above, the welding current setting display / measured value display 44
When the "weld I" display element W1 is lit,
The "current value" display element 48 displays the measured value of the welding current value during the first weld time TW1.

If the operator wants to see another current measurement value, for example, the welding current measurement value for the second weld time TW2, he presses the "current" key 46, and then presses the cursor key 50 to display the "current" value. Weld II "display element W2 is turned on. Then, the mode is temporarily switched to the set value input mode (steps [14] and [1]). Then, if the “measurement value display” key 78 is pressed, the mode returns to the measurement value display mode (step [3]). The measured value of the welding current during the second welding time TW2 is displayed on the display element 48 (step [12]).

The number of welding points is one for each resistance welding.
Therefore, each count value of the total counter, the hit point counter, and the production counter is incremented by one. When any of these count values reaches a set value (preset value), a counter alarm processing routine (step [16]) described later is executed.

FIG. 10 shows a counter alarm processing routine. First, it is determined or recognized which of the total counter, the hit point counter, and the production counter has reached the preset value (step [17]).

When the total counter reaches the preset value, the buzzer on the back of the apparatus continuously sounds (eg, beeps), and at the same time, the "data" display element of the data / counter setting / display section 62 of the front panel 12 The preset value of the total counter blinks at 72 (step [18]). Also, although not shown in FIG.
An abnormal output signal is output to the outside via O112. When the "count reset" key 80 on the front panel 12 is pressed, the total counter is reset (step [1]).
9], [20]), and this routine ends.

When the hit point counter reaches the preset value, the buzzer sounds for one second (for example, a short sound) (step [21]), and the hit point counter is automatically reset (step [22]).

When the production counter reaches the preset value, the buzzer intermittently (for example,
At the same time, the preset value of the production counter blinks on the "data" display element 72 of the data / counter setting / display unit 62 of the front panel 12 (step [2]
3]). Also in this case, when an abnormal output signal is output to the outside via the I / O 112 and the "count reset" key 80 on the front panel 12 is pressed, the production counter is reset (steps [24] and [25]). ), This routine ends.

FIG. 11 shows an abnormality alarm processing routine.
The details of the abnormality in the apparatus include, for example, “current setting abnormality” in which the welding current value exceeds the monitoring value, and thyristor 134A, 1
There is a "thyristor short circuit abnormality" in which the short circuit 34B is short-circuited, a "conduction angle abnormality" in which the conduction angle exceeds a set value, and the like.

In this abnormality alarm processing routine, an abnormality signal is output to the outside (step [26]), and FIG.
As shown in FIG. 2, the code of the content of the abnormality blinks on the "data" display element 72 of the data counter setting / display section 62. In addition, the “abnormal” display element 24 or the “current caution” display element 30 of the status display section 20 is also turned on. On the other hand, all other display elements are turned off (step [2]
6]). As a result, workers in the vicinity can use the front panel 12.
It is possible to recognize the abnormal situation and the details of the abnormality simply by glance at, and to take an appropriate action immediately. The “Reset” key 93 on the lower operation panel 92
Is pressed, the abnormal display ends, and this routine ends (steps [28] and [29]).

In the example shown in FIG. 9, the abnormal alarm processing routine is set after the welding sequence is completed. However, when an abnormal situation occurs in the apparatus, an abnormal alarm is generated by interruption at any time (for example, even during the setting input). A processing routine may be performed. After the abnormal alarm processing routine or the counter alarm processing routine is completed, the mode may be automatically switched to the setting input mode (even if any setting item selection key is not pressed).

As described above, in the resistance welding control apparatus according to the present embodiment, any one of the (usually a setting input target) is used.
When the setting item selection key is pressed, the mode switches to the setting input mode (program mode) in response to the key operation.
"+ Data input" key 84, "-data input" key 86
The setting value (registration data) of each setting item is updated each time the key input is performed, and the operation mode is entered at any time in response to a start signal from the outside.

As described above, the desired setting can be input only by operating the two types of keys, the setting item selection key and the data input key. Therefore, the number of keys on the operation (front) panel 12 is required to be a minimum number. Also, the input operation procedure is very simple. Therefore, the burden on the operator at the welding work site can be greatly reduced. Moreover, as described above, the welding sequence can be executed in response to an external start signal at any time (without pressing a special mode selection key for switching to the operation mode such as the conventional operation key 238). In addition, non-execution of welding, non-energization, and the like can be prevented, and defective welding is not required.

Further, in the resistance welding control device of this embodiment,
By simply pressing the "measurement value display" key 78, any of the measurement values of the measurement item in the immediately preceding resistance welding can be switched any number of times, once to the measurement value of another measurement item, or to the setting input mode. However, it can be seen on the front panel 12. Therefore, all the measurement items can be monitored by one resistance welding.

In the resistance welding control device according to the present embodiment,
When an abnormality occurs in the apparatus, the display elements (24, 30, 72) related to the abnormality alarm while all other display elements are turned off.
Since only the light is turned on, the operator can visually recognize or recognize the abnormal situation at a glance by the contrast effect.

In the resistance welding control device according to the present embodiment,
The number of welding spots can be monitored in three modes: a total counter, a spot counter, and a production counter. When a preset value is reached in each mode, only a required alarm is displayed on the front panel 12. Instead, a different buzzer sound was output for each mode from the buzzer 113, so that nearby workers could use the front panel 12
You can know the meaning or content of the counter alarm by hearing without having to look at it.

Although the resistance welding control device of the above-described embodiment is a vertical unit, as shown in FIG. 13, the present invention can be applied to a horizontal resistance welding control device. In the resistance welding control device of FIG. 13, a welding sequence display section 34 'and a cycle setting /
A display section 38 'is provided, and the corresponding display elements Di and setting item selection keys Ki are arranged vertically adjacent to each other. The welding current setting display is displayed on the lower half of the front panel 12 '.
A measurement value display section 44 'and a monitor setting / display section 52' are provided. In these sections 44 'and 52', one display element Dj corresponds to a plurality (for example, three) of setting item selection keys Kj. The vertical lower operation panel 92 has been changed to a horizontal right operation panel 92 '.

This horizontal resistance welding control device has the same keys, display elements, circuit configuration, and software as those of the vertical type, and functions in the same manner. Therefore, the same operation and effect as described above can be obtained.

[0088]

As described above, according to the first resistance welding control apparatus of the present invention, the minimum necessary keys for using only the selection keys of the setting item selection means and the data input keys of the data input means are provided. A desired set value can be input for a desired welding condition by an operation, and the setting input operation can be simplified, and resistance welding can be reliably performed in response to an external start signal, and undesired welding can be performed. Non-energization can be prevented.

Further, according to the second resistance welding control device of the present invention, various measured values obtained by the immediately preceding resistance welding are stored in the measured value storage means, and the measured value display mode selecting means is operated. The various measured values are all or selectively displayed on the display means as many times as necessary, so that a desired measured value can be viewed as many times as possible by one resistance welding.

Further, according to the third resistance welding control apparatus of the present invention, when an abnormal situation is detected in the apparatus, only the abnormal alarm display element is turned on while other display elements are turned off. Therefore, an abnormal situation or contents can be recognized at a glance by an operator or the like by the contrast effect, and appropriate measures can be taken promptly and surely.

Further, according to the fourth resistance welding control device of the present invention, the counter value of the number of welding points can be set in a plurality of modes. Since the buzzer sound peculiar to the counter is emitted, it is possible to make an operator or the like audibly recognize the meaning or content of the counter alarm.

[Brief description of the drawings]

FIG. 1 is a front view showing a panel configuration of a front portion of a vertical resistance welding control device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a panel configuration of a front portion of the resistance welding control device according to the embodiment.

FIG. 3 is a partially enlarged view showing a configuration of a state display unit 20 on a front panel 12 of the resistance welding control device according to the embodiment.

FIG. 4 is a partially enlarged view showing a configuration of a welding sequence display unit, a cycle setting / display unit 38, and a welding current setting display / measured value display unit 44 on the front panel 12 of the resistance welding control apparatus according to the embodiment.

FIG. 5 is a partially enlarged view showing a configuration of a monitor setting / display unit 52 on the front panel 12 of the resistance welding control device according to the embodiment.

FIG. 6 is a partially enlarged view showing a configuration of a data counter setting / display unit 62 on the front panel 12 of the resistance welding control device according to the embodiment.

FIG. 7 is a block diagram illustrating a system configuration of the resistance welding control device according to the embodiment.

FIG. 8 is a flowchart illustrating a CPU processing operation in a setting input mode in the resistance welding control device according to the embodiment.

FIG. 9 is a flowchart showing a CPU processing operation in an operation mode and a measured value display mode in the resistance welding control device according to the embodiment.

FIG. 10 is a flowchart illustrating a counter alarm processing routine in the resistance welding control device according to the embodiment.

FIG. 11 is a flowchart illustrating an abnormality alarm processing routine in the resistance welding control device according to the embodiment.

FIG. 12 is a partially enlarged view showing a display element for displaying an error content in the resistance welding control device according to the embodiment.

FIG. 13 is a perspective view showing a panel configuration of a front part of a horizontal resistance welding control device according to another embodiment.

FIG. 14 is a front view showing a panel configuration of a front part of a conventional resistance welding control device.

[Explanation of symbols]

 Reference Signs List 10 Resistance welding control device 12 Front panel 14 Schedule No. setting / display unit 20 Status display unit 34 Welding sequence display unit 38 Cycle setting / display unit 40 “Cycle” key 42 “Cycle” display element 44 Welding current setting display / measured value Display unit 46 “Current value” key 48 “Current value” display element 52 Monitor setting / display unit 62 Data counter setting / display unit 78 “Measured value display” key 82 Data input unit 84 “+1 data input” key 86 “− “1 data input” key 102 CPU 104 RAM 106 ROM 112 I / O 113 buzzer

Claims (5)

(57) [Claims] 1. A set of various welding conditions, in the resistance welding control apparatus adapted to display the measured values for a given welding conditions, it is corresponding to each setting item of the welding schedule or welding conditions
One selection key, and press the key of the corresponding selection key.
-Setting input for each setting item is possible in response to operation
Number of display elements and setting item selection means, each corresponding to one of the setting items or measurement items, and disposed with respect to the selected key corresponding to the setting item or measurement items in a predetermined positional relationship of A data input means comprising first and second data input keys for respectively incrementing and decrementing a setting value of a setting item for which setting input is enabled by the setting item selecting means; Setting value storage means for storing the setting values of the respective setting items for each of the set welding schedules; each time there is a key input from the data input means for the setting items for which setting input is enabled by the setting item selecting means Setting value updating means for updating the setting value in the storage means corresponding to the setting item in response to the key input; Starting signal input means for inputting a starting signal designating any one of the joules; responding to the starting signal input to the starting signal input means, the starting signal corresponding to the welding schedule specified by the starting signal; A welding control unit for executing a welding sequence based on the set value in a storage unit. 2. A welding condition measuring means for measuring a welding condition of a predetermined measurement item when the welding sequence is executed, and a measured value obtained by the welding condition measuring means in the immediately preceding welding sequence. Measured value storage means, measured value display control means for displaying the measured values obtained by the welding condition measuring means in the immediately preceding welding sequence on the corresponding display elements, and setting the display mode of the device to the immediately preceding display mode. A measurement value display mode selecting means for switching to a measurement value display mode for displaying the measurement values obtained by the welding condition measurement means in the welding sequence on the corresponding display elements. The resistance welding control device according to claim 1. 3. At least one of the display elements is set so as to selectively display one of a plurality of measured values of the welding conditions respectively corresponding to two or more kinds of the measurement items, and the measurement is performed. Each time any one of the plurality of selection keys corresponding to each of the plurality of welding conditions is operated by the key during the measurement value display mode, the value display control means performs the key operation. The resistance welding control device according to claim 2, wherein a measured value of the welding condition corresponding to a key is read from the measured value storage means and displayed on the display element. 4. An alarm display means for alarm display of a predetermined abnormal state in the apparatus, and when the predetermined abnormal state is detected, only the alarm display means is turned on and at the same time all other alarm display means are turned on. The resistance welding control device according to claim 1, wherein the display element is turned off. 5. A welding point number counter setting means for setting a welding point number counter value in a plurality of modes, and according to the mode when the welding point number counter value reaches a set value of each mode. A buzzer means for generating different buzzer sounds.
3. The resistance welding control device according to item 1.