JP2931871B1 - Arc time measuring device for welding machine - Google Patents

Abstract

The present invention provides an arc time measuring device for a welding machine that can accurately measure an arc time and can grasp an arc time for each worker. SOLUTION: The measuring device 1 is divided into a detection unit 3 previously mounted on the arc welding machine 4 and a main body 2 detachably connected to the detection unit 3 and configured to be portable. The main body 2 is assigned to each worker one by one.
The detection unit 3 outputs a voltage between the output terminals 9 and 10 to which the welding electrode 11 and the connection target material 12 are connected as a detection signal via a current detection circuit 13 provided in the arc welding machine 4 in advance. The current detection circuit 13 includes output terminals 9, 1
This is a circuit that conducts when a current flows between zero. The main body 2 performs a timing operation when the voltage (detection signal) from the detection unit 3 is within a predetermined range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc time measuring apparatus for an arc welding machine capable of accurately measuring the welding time of an arc welding machine, that is, the time during which an arc is actually generated (referred to as "arc time"). It is about.

[0002]

2. Description of the Related Art In order to increase the efficiency of welding work in arc welding, the time during which a worker is actually performing welding within a fixed working time (for example, 8 hours, which is an average working time per day) is occupied. Although it is necessary to increase the ratio, it is necessary to accurately grasp the arc time for each worker. As a method of measuring the arc time for each worker, a method is generally employed in which a measuring person is placed near the worker, and the measuring person uses a measuring device such as a stopwatch.

In the above-described measuring method by a measuring person, the measuring member needs to act together with the worker during working hours, so that the measuring operation requires a great deal of trouble. Further, in order to measure the arc time of a plurality of workers, the same number of measuring persons as the workers are required, so that there is a problem that the cost required for the measurement including labor costs increases.
Therefore, it is not practical to measure and grasp the arc times of all the workers individually and every day. Therefore, a method has been proposed in which an arc time measuring device is built in or connected to a welding machine in advance, and an arc time measured by the measuring device is read by an operator or a person in charge of work and totalized for each operator. .

[0004]

However, what principle the arc time measuring device measures the arc time, that is, what is detected and it is determined that an arc is actually occurring is described. There are some problems. For example, a method in which the supply device that supplies the welding wire is operating and the arc time is measured,
In this method, the time during which the feeding device performs the idle feeding operation is also included in the arc time, which is inaccurate. In addition, a method is considered in which a time during which a voltage is applied between a pair of output terminals connected to a welding electrode and a workpiece to be welded, respectively, is measured to obtain an arc time. Is configured to apply a no-load voltage between the pair of output terminals when pressing.
The time of the state where the welding switch is simply pressed is also included in the arc time, so that it is inaccurate. Furthermore, since an arc current flows through the welding machine when an arc is generated, a method may be considered in which the time during which the current is flowing is used as the arc time, but in this method, the pair of output terminals is short-circuited. The state in which the short-circuit current is flowing, that is, the time during which the short-circuit current flows, is also included in the arc time, which is inaccurate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and an object of the present invention is to provide an arc time measuring device for a welding machine capable of accurately grasping the arc time of each worker. It is in.

[0006]

Therefore, an arc time measuring apparatus for a welding machine according to the present invention comprises a detecting means for outputting a voltage between output terminals as a detection signal when a current flows between output terminals of the welding machine. A time-measuring means for performing a time-measuring operation when a voltage in a specific range including an arc voltage is input, wherein the time-measuring means is detachable from the detection means,
It is characterized by being configured to be portable.

In the arc time measuring apparatus for a welding machine according to the first aspect of the present invention, the time measuring means is separated from the detecting means and is portable, so that one time measuring means can be assigned to all of a plurality of workers. it can. Therefore, the worker can move around the work site with his / her assigned time-measuring means during the working hours of the day, and at each work site, he / she can use his / her own detection means for the welding machine to be used. When the welding is performed by connecting the time-measuring means provided by the device, the time-measuring means automatically performs the time-measuring operation based on the detection signal from the detecting means.

Further, in the above-described arc time measuring device, when a current is flowing through the welding machine, only a voltage in a certain range, that is, an arc voltage generation time is measured.
Therefore, it is possible to accurately measure the arc time except when the no-load voltage is applied and when a short circuit occurs.

According to a second aspect of the present invention, there is provided an arc time measuring device for a welding machine, wherein the welding machine conducts when a current flows between a pair of output terminals respectively connected to a welding electrode and a material to be welded. A circuit is provided, wherein the detection means outputs a voltage between the pair of output terminals via the current detection circuit.

In the arc time measuring device for a welding machine according to the second aspect, the voltage between the pair of output terminals is detected through a current detection circuit which is conducted when a current flows between the pair of output terminals. Output as a signal. Therefore, for example, only when the welding switch is pressed, no detection signal is output in a no-load state where welding is not actually performed,
No timing operation is performed. Further, when a short-circuit current is flowing between the pair of output terminals and a so-called short-circuit current flows, a voltage of almost 0 V is output as a detection signal as a detection signal.
Since the voltage is outside the above-mentioned predetermined range, the timing operation is not performed.

According to a third aspect of the present invention, there is provided a current detection circuit for conducting when a current flows between a pair of output terminals respectively connected to a welding electrode and a material to be welded. And the detection means outputs, via the current detection circuit, a voltage that changes in conjunction with a voltage generated between the pair of output terminals, among control voltages of a control circuit provided in the welding machine. It is characterized by:

In the arc time measuring device for a welding machine according to the third aspect, a specific one of the control voltages of the control circuit is output as a detection signal, but the timing operation of the timing means is the same as that of the second aspect. is there. In this case, when applied to a welding machine in which the current detection circuit is relatively far away from the output terminal but a control circuit is located close to the output terminal, the connection cable can be shortened and the detection means can be made relatively small. Can be configured.

According to a fourth aspect of the present invention, there is provided an arc time measuring apparatus for a welding machine, wherein the detecting means includes a reed switch which closes in an excited state, and a current flows between a pair of output terminals respectively connected to the welding electrode and the workpiece. The above-mentioned reed switch is arranged at a place where it is excited, and a voltage between the pair of output terminals is outputted via the reed switch.

In the arc time measuring apparatus for a welding machine according to the fourth aspect, the voltage between the pair of output terminals is output as a detection signal via a so-called NO type reed switch which closes in an excited state. The timing operation of
Is the same as This device can be easily applied to an arc welding machine not provided with a current detection circuit, so that versatility is improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of an arc time measuring device for a welding machine according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a schematic configuration of an arc time measuring device (hereinafter, simply referred to as a “measuring device”) 1 according to an embodiment of the present invention.
3 is a schematic diagram showing a schematic configuration of a main body 2 of the measuring device 1. FIG.

The measuring device 1 includes a main body 2 serving as a time measuring means,
And a detection unit 3 serving as a detection unit. The detection unit 3 is mounted in advance on the arc welding machine 4 and detects a voltage between terminals in an energized state in the arc welding machine 4,
This voltage is output from the plug 5 as a detection signal. On the other hand, the main body 2 is connected to the detection unit 3 by inserting the plug 6 into the plug 5, receives a detection signal from the detection unit 3, and measures a time when a detection signal (voltage) in a certain range is input. Perform the operation. The main body 2 is separated from the detection unit 3 by pulling out the plug 6 from the plug 5 of the detection unit 3, and is configured so that an operator can carry it in this state.

The arc welding machine 4 has a pair of input terminals 7 and 8.
And a pair of output terminals 9 and 10. Input terminal 7,
8 is connected to a commercial power supply (not shown), one output terminal 9 is connected to the welding electrode 11, and the other output terminal 10 is connected to the workpiece 12. When an operator performs welding, first, the welding switch is pressed to apply a welding voltage between the welding electrode 11 and the workpiece 12.
An arc is generated between the workpiece and the workpiece 12 to perform welding. This state is equivalent to a state in which a load is connected between the output terminals 9 and 10. A current flows between the output terminals 9 and 10. This current is called an arc current. Is referred to as an arc voltage.

In the present invention, the detection unit 3 is configured to output an arc voltage as a detection signal when an arc current is flowing through the arc welding machine 4. Although various circuit configurations for realizing such a function are conceivable, in the embodiment shown in FIG. 1, the current detection circuit 13 provided in the arc welding machine 4 in advance is used. The current detection circuit 13
It includes a pair of terminals 14 and 15 and a switch 16 interposed between the pair of terminals 14 and 15, and includes output terminals 9 and 10.
The switch 16 is configured to turn on when a current flows therebetween. The current detection circuit 13 is provided for automating the welding operation, and for example, various auxiliary devices (for example,
It is used for outputting a control signal for starting a traveling device for moving the arc welding machine 4 in the welding direction).

The specific configuration of the detection unit 3 will be described. One terminal 14 of the current detection circuit 13 is connected to the output terminal 9,
The other terminal 15 is connected to one contact 5a of the plug 5, and the other contact 5b of the plug 5 is connected to the output terminal 10. As a result, the voltage between the pair of output terminals 9 and 10 is changed via the current detection circuit 13 to the pair of contacts 5a and 5a of the plug 5.
5b is output as a detection signal.

On the other hand, the main body 2 is configured to perform a timing operation when the detection signal from the detection section 3 has a voltage value in a predetermined range. Specifically, as shown in FIG.
The main body 2 includes a plug 6, a time counter 17, and a reset switch 18. The time counter 17 includes a pair of count input terminals 19 and 20 and a pair of reset input terminals 21 and 22 and performs a time counting operation only when a voltage in a predetermined range is input to the count input terminals 19 and 20. , And sequentially accumulates the time counting results and stores them in the memory. The range of the voltage includes the arc voltage in the arc welding machine 4, and the vicinity of 0 V is excluded. For example, 24 V to 240 V for AC, and 6 V to DC for DC
Set to 240V. One contact 6a of the plug 6 is connected to the count input terminal 19, and the count input terminal 20
Is connected to the other contact 6b. Therefore, when the plug 6 is connected to the plug 5, a detection signal from the detection unit 3 is input to the count input terminals 19 and 20. Also,
A reset switch 18 is connected between the pair of reset input terminals 21 and 22. When the push button 18a is pressed, the reset switch 18 is turned on, whereby the reset input terminals 21 and 22 are connected and the reset function is performed. Operate. The reset function is to erase the timekeeping result stored in the memory and set it to the initial value “0”. The time counter 17 includes a power switch, a display unit for displaying a result of the time measurement, a changeover switch for switching between AC and DC of the input voltage, and the like.
For example, an H7ET-FBV time counter manufactured by OMRON Corporation can be used.

Here, the relationship between the state of the arc welding machine 4, the voltage value of the detection signal output from the detection unit 3, and the time counting operation of the time counter 17 will be described. First, in a state in which no arc is generated just by the operator pressing the welding switch, a no-load voltage is applied between the output terminals 9 and 10, but no current flows. Detection circuit 1
3 (switch 16) is in the OFF state, no detection signal is output, and therefore, the time counter 17 does not perform the clocking operation. Next, in a state where an arc is generated, an arc current flows, so that the current detection circuit 13 in the detection unit 3 is turned on.
(Switch 16) is turned on, and the arc voltage is output as a detection signal. This arc voltage takes a value greater than 0 V and less than the no-load voltage value. However, since the input voltage range of the time counter 17 is set to a range including the arc voltage range, the arc voltage may be input. Accordingly, the time counter 17 performs a time counting operation.

When the output terminals 9 and 10 are short-circuited, a short-circuit current flows between the output terminals 9 and 10 so that the current detection circuit 13 (switch 16) in the detection unit 3 is turned on. The voltage generated between the output terminals 9 and 10 is output as a detection signal.
Since the voltage generated between 0 and 0 is substantially 0 V and is outside the input voltage range of the time counter 17, the time counter 1
7 does not perform the timing operation.

As described above, according to the present embodiment, the main body 2
Is separated from the detection unit 3 and made portable.
The main body 2 can be assigned to each of a plurality of workers one by one. Therefore, if the detectors 3 are attached to all the arc welding machines 4 to be used in advance, the worker can move the work site while carrying the body 2 allocated to him during the working time of one day. . At each work site, if the user connects his / her own main body 2 to the detection unit 3 of the arc welding machine 4 to be used, and then performs welding, the main body 2 automatically detects the detection signal from the detection unit 3. Perform a timing operation based on.

Accordingly, the arc time during one working day can be accurately measured only by the worker without the need for a measuring person as in the prior art and without imposing an excessive burden on the worker. . By measuring the arc time in this manner, the work efficiency of each worker can be easily grasped, and a work plan and a work target for each worker can be easily set. As a result, the awareness of the welding efficiency of the workers can be changed, and the welding efficiency of each worker can be improved.

Further, since the detecting section 3 outputs the arc voltage as a detection signal when an arc current is flowing through the arc welding machine 4, time measurement is performed only when the arc is on. The arc time can be measured accurately. The principle of detecting the arc-on state of the detection unit 3 can be applied to all types of arc welding machines 4,
One main body 2 can measure the arc times of all types of arc welding machines. As a result, the cost can be reduced as compared with the case where different measuring devices are prepared for each type. Furthermore, since the detection unit 3 is configured using the current detection circuit 13 provided in the arc welding machine 4 in advance, it can be configured relatively easily.

FIG. 3 is a schematic diagram showing another embodiment of the present invention. In FIG. 3, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted. A feature of the present embodiment is that the detection unit 3 is configured to output a control voltage of the control circuit 23 provided in the arc welding machine 4 as a detection signal.

More specifically, one terminal 14 of the current detection circuit 13 is connected to the terminal 24 of the control circuit 23 and the other terminal 1
5 is connected to the other contact 5b of the plug 5;
The terminal 25 of the control circuit 23 is connected to the one contact 5a. As a result, the pair of terminals 24, 2
The voltage between 5 is output as a detection signal to a pair of contacts 5 a and 5 b of the plug 5 via the current detection circuit 13. However, the control voltage generated between the pair of terminals 24 and 25 is within the input voltage range of the time counter 17 of the main body 2 and further changes in conjunction with the voltage change between the output terminals 9 and 10. You need to choose. For example, 24V to 100V for AC voltage and 6V to 100V for DC voltage
The range of V is preferred. This is because when a short-circuit current flows between the output terminals 9 and 10, a voltage of approximately 0 V is output as a detection signal, and time is not measured during this time.

In this embodiment, the same effects as those of the embodiment shown in FIG. 1 can be obtained. Note that the present embodiment is implemented in an arc welding machine 4 in which the current detection circuit 13 is disposed relatively far from the output terminals 9 and 10 and the control circuit 23 is disposed close to the current detection circuit 13. ,
The length of the connection cable in the welding machine can be shortened to configure the detection unit 3, so that the configuration of the detection unit 3 can be reduced in size and the control cost can be reduced.

FIG. 4 is a schematic diagram showing still another embodiment of the present invention. In FIG. 4, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted. This embodiment is characterized in that the output terminals 9, 1
The detection unit 3 outputs a voltage between zero as a detection signal via a NO-type magnet operation type reed switch 26.
That is,

As shown in FIG. 5, the NO type reed switch 26 is in the non-excited state (the state where no magnetic field exists).
Although it is in the FF state, it is in the ON state in the excited state (the state in which a magnetic field exists). Therefore, if the reed switch 26 is arranged, for example, at the output terminal 9 or in the vicinity thereof, when the current flows through the output terminal 9, it is turned on. This is exactly the same as the operation of the current detection circuit 13. Therefore, the configuration shown in FIG. 4 uses a reed switch 26 instead of the current detection circuit 13 in the configuration of FIG.

More specifically, one terminal of the reed switch 26 is connected to the output terminal 9, the other terminal is connected to one contact 5a of the plug 5, and the other terminal 5b of the plug 5 is connected to the output terminal 10. You. As a result, a voltage between the pair of output terminals 9 and 10 is output as a detection signal to the pair of contacts 5 a and 5 b of the plug 5 via the reed switch 26.

In this embodiment, the same effects as those of the embodiment shown in FIG. 1 can be obtained. In particular, this embodiment is
This is particularly effective when the arc welding machine 4 is not provided with the current detection circuit 13 or when the current detection circuit 13 is already used for another purpose. Further, the reed switch 26 may be arranged at or near the output terminal 10, and may be arranged at another place as long as an arc current flows and a magnetic field is generated. is there.

For example, as shown in FIG. 4, the AC arc welding machine 4 has a transformer structure inside. That is, the input terminals 7, 8 are connected to both ends of the primary coil 28 wound around the iron core 27, and the output terminals 9, 10
Are connected to both ends of a secondary coil 29 wound around the iron core 27. In addition, 30 is a movable iron core. In such a configuration, the reed switch 26 may be disposed on the iron core 27 or in the vicinity thereof.

Also, in the configuration shown in FIG. 3, it goes without saying that a reed switch 26 may be used instead of the current detection circuit 13.

[0035]

As described above, according to the arc time measuring device for a welding machine according to the first aspect, it is possible to eliminate the need for the measuring person described in the prior art and to place an excessive burden on the operator. Only the operator can accurately measure the arc time during the working time of one day. By measuring the arc time in this manner, the work efficiency of each worker can be easily grasped, and a work plan and a work target for each worker can be easily set. As a result, the awareness of the welding efficiency of the workers can be changed, and the welding efficiency of each worker can be improved. Further, the principle of detecting the arc-on state by the detecting means can be applied to various types of arc welding machines, so that one time measuring means can measure the arc times of a plurality of types of arc welding machines. As a result, the cost can be reduced as compared with the case where different measuring devices are prepared for each type.

Further, according to the arc time measuring device for a welding machine of claim 2, 3, or 4, when an arc current is flowing between the pair of output terminals, that is, an arc is actually generated. Since the timekeeping operation is performed only when the time is on, the arc time can be accurately measured.

In particular, according to the arc time measuring device for a welding machine according to the second or third aspect, since the detecting means is constituted by using a current detecting circuit provided in advance in the welding machine, it is relatively simple. It can be easily configured.

Further, according to the arc time measuring apparatus for a welding machine of the fourth aspect, the present invention can be applied to an arc welding machine having no current detecting circuit, so that the versatility is expanded.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a measuring device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a schematic configuration of a main body constituting the measuring device.

FIG. 3 is a schematic diagram illustrating a schematic configuration of a measurement device according to another embodiment.

FIG. 4 is a schematic diagram showing a schematic configuration of a measuring device according to still another embodiment.

FIG. 5 is a schematic diagram for explaining the operation of the reed switch shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arc time measuring device 2 Main body 3 Detector 4 Arc welding machine 9 Output terminal 10 Output terminal 11 Welding electrode 12 Workpiece 13 Current detection circuit 23 Control circuit 26 Reed switch

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tetsuo Iwai 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Plant (56) References JP 50-66455 (JP, A) 63-123569 (JP, A) Japanese Utility Model 1-68174 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23K 9/095 515 B23K 9/10 B23K 31/00

Claims (4)

(57) [Claims] 1. A detecting means for outputting a voltage between output terminals as a detection signal when a current flows between output terminals of a welding machine, and a timing operation when a voltage in a specific range including an arc voltage is input. And a time-measuring means for performing the following operations, wherein the time-measuring means is configured to be detachable and portable with respect to the detecting means. 2. The welding machine according to claim 1, further comprising a current detection circuit that conducts when a current flows between a pair of output terminals connected to the welding electrode and the workpiece, respectively. 2. The arc time measuring device for a welding machine according to claim 1, wherein a voltage between said pair of output terminals is output via a current detection circuit. 3. The welding machine further comprises a current detection circuit that conducts when a current flows between a pair of output terminals respectively connected to the welding electrode and the workpiece, and wherein the detection means includes: The welding machine according to claim 1, wherein a voltage that changes in conjunction with a voltage generated between the pair of output terminals is output from a control voltage of a control circuit included in the welding machine via a current detection circuit. Arc time measuring device. 4. The detecting means includes a reed switch that closes in an excited state, and the reed switch is arranged at a place where the current is excited when a current flows between a pair of output terminals respectively connected to the welding electrode and the material to be welded. The arc time measuring device for a welding machine according to claim 1, wherein a voltage between the pair of output terminals is output via the reed switch.