JP2003191079A - Transmission device for welding condition of resistance welding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remarkably decrease the load of maintenance jobs such as replacement of a primary battery and charging of a secondary battery by connecting to a commercially supplied power source, while receiving a merit that data is transmitted to a data output device 70 by a wireless method. <P>SOLUTION: The transmission device for welding condition 40 is used by being attached to a secondary side conductive body 32 of a welding gun 30 of resistance welding machine 10. The device 40 is provided with a secondary battery 60 which stores the power supplied to respective parts, a charging circuit 58 which charges a secondary battery 60 by making use of the welding power of the secondary side of the resistance welding equipment 10. A troidal 42 for charging welding power which is mounted on the secondary side conductive body 32 and connected to the charging circuit 58, a troidal coil 46 for detecting a welding current, and a data transmission and reception circuit 68 which transmits data based on the welding current detected by the troidal coil 46 by the wireless method. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects an index related to a welding state such as a welding current, a pressing force, and a conduction time (including indexes related to these) of a resistance welding machine, and wirelessly outputs data based on the detected index. Regarding transmitting device.

[0002]

2. Description of the Related Art A toroidal coil (an example of a sensor that detects an index related to a welding state) for detecting an index related to a welding state of a resistance welding machine (a differential value of a welding current) and data based on the index detected by the toroidal coil. A welding state detecting device including a data output means for outputting and a toroidal coil and a data output means connected by a long cable is a conventionally known aspect (first prior art). Further, Japanese Patent Laid-Open No. 8-99181 discloses a resistance welding machine,
A device used by being attached to the next side, and a toroidal coil that detects an index relating to the welding state of a resistance welding machine,
There is disclosed a welding state transmitter including a transmitter that wirelessly transmits data based on an index detected by a toroidal coil to a data output device (second prior art).

When using the first prior art device, it is necessary to mount the toroidal coil on the movable welding gun (secondary side conductor or the like) of the resistance welding machine. When the toroidal coil is attached to a movable welding gun, the long cable connected to the toroidal coil may get caught or entangled in the welded member and other parts as the welding gun welds (pressurizes, etc.). Then, there is a problem that the cable is easily broken or the member to be welded and other parts are easily damaged. Also,
When the welding gun is sequentially moved to weld a plurality of parts, the cable is more likely to be caught or entangled. Therefore, when the device of the first prior art is used, the plurality of parts are welded. Therefore, it was difficult to detect the index regarding the welding state in the state where the welding gun was moved sequentially.

The second conventional technique solves the above-mentioned problem due to the existence of a long cable between the toroidal coil and the data output means in the first conventional technique by transmitting the data to the data output device in a wireless manner. It is what In the second prior art device, the toroidal coil and the communication means are not connected by a long cable, but the toroidal coil and the communication means are integrated and used by being mounted on the secondary side of the resistance welding machine. Therefore, the problem that occurs in the first conventional technique does not occur.

[0005]

In the second prior art, it is necessary to supply drive power to each part of the device including a communication means that communicates by a wireless method. In this case, if the welding state transmitter is always connected to a commercial power source or the like by wire and the driving power is obtained from the commercial power source or the like, there is an advantage of transmitting data wirelessly to the data output device (data receiving device). Lost. For this reason, the exchangeable 1
It is necessary to obtain driving power by mounting a secondary battery or a rechargeable secondary battery on the welding state transmitter. In this case, in the second conventional technique, when the primary battery is mounted,
The primary battery had to be replaced every time it was consumed. Two
When the secondary battery is installed, it is necessary to connect to a commercial power source or the like to charge the secondary battery each time the secondary battery is consumed. Further, in the second conventional technique, when changing the setting of the detection condition of the index relating to the welding state or rewriting the execution program of the welding state transmitting device, it is necessary to directly touch the welding state transmitting device and operate it. there were.

However, it has been a heavy burden to perform maintenance work such as replacement of the primary battery and charging of the secondary battery by connecting to a commercial power source each time the battery is consumed. Further, since the secondary side (welding gun) of the resistance welding machine is usually arranged at the tip of the welding robot or the back of the welding jig, touch the welding state transmitting device attached to the secondary side. Alternatively, removing the welding status transmitter from the secondary side and performing maintenance work such as battery replacement / charging, detection condition setting change, and rewriting of the execution program is a troublesome and troublesome work, and a heavy burden. Was there. As described above, in the second conventional technique, the burden of maintenance work is large, and it is desired to significantly reduce the burden.

In the second prior art, the data based on the index relating to the welding state detected each time welding is performed (hereinafter appropriately referred to as "welding data") is transmitted from the welding state transmitter, but the data is output. Device (data receiving device)
The data output device may not be able to receive the welding data because it does not exist in the communicable area. It is practically difficult to receive all of the welding data transmitted from the welding state transmission device because the data output device must be always located within the communicable area.

According to the present invention, in an apparatus for detecting an index relating to a welding state and transmitting data based on the index by a wireless method, the data is wirelessly transmitted to an external device such as a data output apparatus (data receiving apparatus). While enjoying the merits of the above, charging of the replacement of the primary battery, charging of the secondary battery by connecting to a commercial power source, change of detection condition settings,
The first object is to significantly reduce the burden of maintenance work such as rewriting of execution programs. The present invention also makes it possible, even when an external device such as a data output device receives the necessary data from the welding state transmitting device, to easily obtain the data from the welding state transmitting device. This is the second issue. The present invention has been made to solve at least a part of the above problems.

[0009]

Means for Solving the Problems, Actions and Effects The present invention is first embodied in a welding state transmitter. A welding state transmission device of a first aspect embodying the present invention is a device that is used by being attached to a secondary side of a resistance welding machine, and includes a power storage unit that stores electric power supplied to each part of the device and a resistance. Charging means for charging the power storage means by using welding power on the secondary side of the welding machine, a sensor for detecting an index relating to a welding state, and a transmitting means for transmitting data based on the index detected by the sensor by a wireless method. It is provided (Claim 1).
Here, examples of the “wireless system” include a wireless system in which data is transmitted by radio waves and an infrared system in which data is transmitted using infrared rays.

The present invention has the problems of the second prior art (every time the driving power is consumed, it is necessary to replace the primary battery or perform maintenance work such as charging by connecting the secondary battery with a commercial power source). Is effectively solved by making good use of the unique characteristics of the resistance welding machine. That is,
They have found that the welding power generated by the resistance welding machine is used as the driving power for the wireless welding state transmitter. The welding current generated by the resistance welding machine is usually a large current of several thousand amps to several hundreds of thousands amperes. On the other hand, the current required for the communication means of the welding status transmitter is usually several amperes or less. Therefore, even if a part of the welding power generated by the resistance welding machine is used as the driving power for the welding state transmitter, the resistance welding is hardly affected.

On the other hand, according to the aspect of the present invention, there are provided a storage means for storing electric power supplied to each part of the apparatus, and a charging means for charging the storage means by utilizing welding power on the secondary side of the resistance welding machine. As a result, the maintenance work such as replacement of the primary battery and charging by connecting the secondary battery to a commercial power source is unnecessary in principle. In addition, since the device of the aspect of the present invention is used by being attached to the secondary side of the resistance welding machine, there is a problem such as disconnection of the cable in the first prior art or damage to the welded member or other parts due to the cable being caught or entangled. Occurrence of a situation can be avoided. It is also possible to detect the welding gun in a state of being sequentially moved to weld a plurality of parts.

Further, according to the present invention, the welding state transmitting device attached to the secondary side of the resistance welding machine arranged at the tip of the welding robot or the back of the welding jig is touched or the welding state is transmitted. There is also an effect that it is not necessary to remove the device from the secondary side and replace the battery and charge the battery.

As described above, according to the aspect of the present invention, it is possible to remarkably reduce the burden of maintenance work while enjoying the merit of wirelessly transmitting data to the data output device. Is obtained.

In the apparatus of claim 1, it is preferable that the charging means has a coil arranged around a cable for supplying a welding current, and the coil is used to charge the power storage means. 2). According to this aspect, the charging can be effectively performed with a simple configuration in which the coil is arranged around the cable that supplies the welding current.

In the apparatus of claim 1 or 2, it is preferable that the charging means charges the power storage means by using a voltage between cables for supplying a pair of welding currents (claim 3).
According to this aspect, charging can be effectively performed with a simple configuration without using a coil or the like.

A welding state transmitting device of a second aspect embodying the present invention is a device which is used by being attached to a secondary side of a resistance welding machine, and which relates to a sensor for detecting an index relating to the welding state and a welding state. A control unit that controls the index to be detected according to a predetermined detection condition, a transmission unit that wirelessly transmits data based on the index detected by the sensor, and a reception unit that receives data wirelessly transmitted from an external device. Equipped with means. Then, the detection condition used by the control means can be set based on the detection condition setting data received wirelessly from the external device by the receiving means (claim 4). According to the present invention, the welding state transmitting device attached to the secondary side of the resistance welding machine arranged at the tip of the welding robot or the back of the welding jig is touched by the hand, or the welding state transmitting device is attached to the secondary side. Since it is not necessary to perform the troublesome and troublesome work of removing from the side and changing the setting of the detection condition, the burden of maintenance work can be greatly reduced.

A welding state transmitting apparatus of a third aspect embodying the present invention is an apparatus mounted and used on the secondary side of a resistance welding machine, and a storage means for storing an execution program of the apparatus, It is provided with a sensor that detects an index relating to a welding state, a transmitting unit that wirelessly transmits data based on the index detected by the sensor, and a receiving unit that receives data wirelessly transmitted from an external device. The execution program stored in the storage means
Rewriting is possible based on the execution program data wirelessly received from the external device by the receiving means (claim 5). According to the present invention, the welding state transmitting device attached to the secondary side of the resistance welding machine arranged at the tip of the welding robot or the back of the welding jig is touched by the hand, or the welding state transmitting device is attached to the secondary side. The burden of maintenance work can be significantly reduced, since it is not necessary to perform the troublesome and troublesome work of removing it from the side and rewriting the execution program.

A welding condition transmitter of a fourth aspect embodying the present invention is a device which is used by being attached to the secondary side of a resistance welding machine, and which detects a sensor for detecting an index relating to the welding condition and the sensor. Transmitting means for wirelessly transmitting data based on the index, a receiving means for receiving data wirelessly transmitted from an external device, and means for accumulating and storing data based on the index detected by the sensor And a control means for extracting the data stored in the storage means on the basis of the request data received from the external device by the receiving means in a wireless manner and transmitting the extracted data by the transmitting means. 6). According to the present invention, even when an external device such as a data output device receives necessary data from the welding state transmitting device and fails to receive it, the data can be easily acquired from the welding state transmitting device.

In the apparatus according to any one of claims 1 to 6, it is preferable that the sensor is a toroidal coil for detecting a differential value of a welding current (claim 7). According to this aspect, the welding current, which is the most important index indicating the welding state of the resistance welding machine, can be detected with a simple configuration.

The present invention is also embodied in a welding condition detection system. A welding state detection system according to a first aspect of the present invention includes a welding state transmission device according to any one of claims 1 to 7 and a welding state detection system including a data output device. Here, the data output device has a receiving means for receiving the data transmitted by the wireless method, and a computing means for generating the data to be output based on the data from the welding state transmitting device received by the receiving means (claim). 8). According to this aspect, the data output device can output useful data in addition to the data transmitted from the welding state transmission device. Moreover, since the data output device and the welding state transmission device perform wireless communication, the data output device can be moved and used without worrying about the breakage of the cable or the damage or destruction of each part.

A welding state detecting system according to a first aspect of the present invention includes the welding state transmitting device according to any one of claims 1 to 7, a welding state control device, and a resistance welding machine. Here, the welding state control device is a receiving means for receiving the data transmitted by the wireless system, and a control means for controlling the welding state of the resistance welding machine based on the data from the welding state transmitting device received by the receiving means, or It has monitor means for monitoring the welding state (claim 9). According to this aspect, since the welding state of the resistance welding machine can be controlled based on the data fed back from the welding state apparatus that is wirelessly received with the welding state communication apparatus, accurate resistance welding can be realized. It is also possible to simply monitor the welding state.

In the present specification, "means" is not limited to hardware, but includes cases where the function of each means is realized by software. Further, even if the function of one means is realized by two or more hardware or software, or the function of two or more means is one.
It may be realized by one piece of hardware or software. For example, the transmission means and the reception means of claim 4 may be realized by one piece of hardware such as a transmission / reception circuit.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) FIG. 1 shows an explanatory view of a welding state transmission device 40 of a first embodiment and a welding state detection system including this device 40. This system includes a resistance welding machine 10, a welding state transmission device 40 of the resistance welding machine 10, and a data output device 70 that receives data from the welding state transmission device 40.

The resistance welding machine 10 includes a circuit unit 20 and
A welding gun unit 30 is provided. Circuit unit 20
Is a rectifier circuit 23 and an inverter circuit 2 which are connected in order.
4 and a transformer 27 are provided. The circuit unit 20 also includes a drive circuit 25 connected to the inverter circuit 24,
A welding state control device 26 connected to the drive circuit 25 is provided. The rectifier circuit 23 is connected to the commercial three-phase AC power supply 22. The welding gun unit 30 includes a pair of secondary-side conductors 32 connected to the secondary side of the transformer 27 of the circuit unit 20 and a pair of welding electrodes 34 attached to the tips of the respective secondary-side conductors 32. . Welding gun unit 3
The secondary conductor 32 of 0 can be freely moved by an actuator (not shown) in a direction in which the members W1 and W2 to be welded are pressed, a direction in which a welding site of the members W1 and W2 is present, and the like. The welding state control device 26 is a CPU
26a, ROM 26b, RAM 26c, monitor 26d and the like.

The welding state transmitting device 40 includes the circuit unit 5
0, a toroidal coil 46 for detecting the welding current, and a toroidal coil 42 for charging the welding power. Here, the circuit unit 50 and both toroidal coils 46, 42
Are connected and integrated by cables 43 and 47 having a length that does not hinder the operation and movement of the welding gun 30.

The circuit unit 50 includes a gain circuit 52, an integrating circuit 54, an A / D conversion circuit 56 and a CP which are sequentially connected.
A U64 and a data transmission / reception circuit 68 are provided. The toroidal coil 46 for detecting the welding current is connected to the gain circuit 52. The secondary conductor 32 of the welding gun 30 is inserted into the circular hollow portion of the toroidal coil 46, and thus the welding gun unit 30 is mounted. The CPU 64 has a RAM 62 and a ROM
66 is also connected. As the data transmission / reception circuit 68, for example, a short-distance wireless communication module (such as a Bluetooth module) which is being widely used as a wireless communication means.
By using, you can expand the target that can send and receive data.

The CPU 64 controls to detect an index relating to the welding state according to a predetermined detection condition. Specific examples of the detection conditions include the detection time (start time to end time) of an index related to the welding state, the type of resistance welding machine (AC welding machine, inverter welding machine), the detection range (hundred to 1,000 A, 1,000 A). A to 10,000 A, 10,000 A to 100,000 A) and the like.

The ROM (flash memory etc.) 66 has
Execution programs for various operations of the welding state transmitter 40 are stored. This execution program has various contents. A concrete example of this execution program is C
A program for controlling the processing of the PU 64 (for example, new secondary welding data (average value, effective value, etc.) based on the index relating to the welding state detected by the toroidal coil 46)
And a data transmission / reception circuit 68 for generating
Program for controlling the operating conditions of the above), a program for controlling the processing of the charging control unit 58a of the charging circuit 58, and the like.

Further, the ROM 66 can store welding data for the past 10,000 points (average current, average voltage, current value per unit time, voltage value per unit time, etc.). These welding data are detected or generated and stored for each welding. If the stored welding data exceeds 10,000 dots,
The oldest welding data is rewritten to new welding data in order.

The circuit unit 50 further includes a charging circuit 58.
And a secondary battery (storage battery, for example, a lithium ion battery) 60 connected to the charging circuit 58. Charging circuit 5
8 is a toroidal coil 4 for charging the welding power mentioned above.
2 is connected. This toroidal coil 42 is similar to the toroidal coil 46, and the welding gun unit 30.
Is attached to. The toroidal coils 42 and 46 are 1
Two toroidal coils can be shared. Electric power is supplied from the secondary battery 60 to each part of the welding state transmitter 40. The circuit unit 50 also includes a timer (not shown) and is used for storing the detection time of the welding current data.

The charging circuit 58 has a charging controller 58a. The charging control unit 58a performs various controls related to charging. Specifically, for example, (1) control is performed so that a current or voltage of a predetermined value or less is applied to the secondary battery 60 to charge the welding power. According to this aspect, it is possible to prevent overcurrent or overvoltage from being applied to the secondary battery 60. (2) When the amount of electric power stored in the secondary battery 60 exceeds a predetermined value, the secondary battery 60 is controlled to stop charging using welding power. According to this aspect, it is possible to prevent the welding power from being excessively supplied to the secondary battery 60. The modes (1) and (2) are particularly useful as modes that support the feature of the present embodiment that charging is performed by using welding power based on a large current that is the welding current of the resistance welding machine 10.

(3) When the amount of electric power stored in the secondary battery 60 becomes less than a predetermined value, the secondary battery 60 is controlled by using the welding power. According to this aspect,
It is possible to prevent a situation in which the operation of the device 40 is stopped due to an insufficient amount of electric power stored in the secondary battery 60. (4) Control is performed so that the secondary battery 60 is charged using welding power every predetermined time of welding by the resistance welding machine 10. This charging control may be performed, for example, every time welding is performed, may be performed periodically such as once when welding is performed three times, or may be performed irregularly. According to this aspect, the battery is charged every predetermined welding time in the resistance welding machine,
More convenient.

The data output device 70 includes a data transmission / reception circuit 72, a CPU 74, and a data output circuit 80 which are sequentially connected.
Is equipped with. The CPU 74 has a RAM 76 and a ROM 7
8 is also connected. Examples of the data output device 70 include a mobile phone, a personal computer, a PDA (Personal Digital).
Assistants) and the like. While a mobile phone or the like is highly convenient to carry, it generally has low processing performance and a small storage capacity, and is suitable for monitoring received data (welding current value or the like). PC or PD
In consideration of its high processing performance and large storage capacity, A and the like perform waveform display based on the received data group, data analysis, data storage, and setting of conditions based on the data analysis result. Suitable for With a personal computer, PDA, or the like, it is easy to store welding current data for a large number of welding points with thousands of dots. According to the system of the first embodiment, the data detected or processed / analyzed by the welding state transmitter 40 can be used simultaneously by a plurality of data output devices 70 (cell phones, personal computers, PDAs, etc.).

Similar to the welding state transmitter 40, the data transmission / reception circuit 70 is, for example, a short-range wireless communication module (Blueto) which is widely used as a wireless communication means.
oth module) is preferably used. It is expected that a mobile phone equipped with a short-range wireless communication module in advance will become widespread in the future. However, by bringing such a mobile phone near the welding state transmitting device 40, various types can be easily installed. The data can be monitored.

The operation of the welding state detection system of the first embodiment will be described. The rectifier circuit 23 of the resistance welding machine 10 is a commercial 3
The three-phase AC voltage from the phase AC power supply 22 is rectified and a DC voltage is output. The inverter circuit 24 contains a switching element. The inverter circuit 24 intermittently performs high-frequency switching in accordance with a control pulse given from the welding state control device 26 via the drive circuit 25, thereby converting the DC input voltage input from the rectifier circuit 23 into a high-frequency AC pulse. Convert and output. Inverter circuit 24
The AC pulse output from is supplied to the primary coil of the welding transformer 27. As a result, an AC pulse similar to the primary side is output to the secondary side coil of the welding transformer 27. The secondary side AC pulse, that is, the welding current I flows into the pair of welding electrodes 34 through the pair of secondary side conductors 32. In this way, the welding current I flowing into the pair of welding electrodes 34 is supplied to the members to be welded W1 and W2, and the resulting Joule heat causes resistance welding of the members to be welded W1 and W2.

A differential detection type current detection sensor (toroidal coil in this example) 46 is attached to the secondary conductor 32 of the resistance welding machine 10. The toroidal coil 46 is
It constitutes a part of the welding state transmitter 40. While the welding current I is flowing, the toroidal coil 46 outputs a signal representing a differential waveform of the welding current I. Since this signal represents a differential waveform of the welding current I, the welding current I is processed and analyzed as it is (the average value calculation of the welding current, the execution value calculation, the derivation of the maximum and minimum values, etc.). Not suitable for. Therefore, the differentiated signal is first input to the gain circuit 52 of the circuit unit 50 and amplified, and then input to the integration circuit 54 to be integrated and integrated signal representing the waveform of the welding current I (current waveform restoration signal). ) Is output.

The output signal of the integrating circuit 54, which is in a state suitable for processing and analyzing the welding current I, is first input to the A / D conversion circuit 56 and converted into digital data. Then, data processing and analysis useful for inputting to the CPU 64 to show various results of resistance welding and effectively performing future resistance welding are performed. Here, the CPU 64 is R
Necessary data is appropriately acquired from the AM 62 and the ROM 66, and the detected and processed / analyzed data is stored in the RAM 62 and the ROM 66. Various types of detection, processing / analysis data processed by the CPU 64 are wirelessly transmitted from the data transmitting / receiving circuit 68. The CPU 64 also controls the data transmission / reception circuit 68. For example, the timing of transmitting data and the setting of data to be transmitted are set.

This wireless transmission data is output by the data output device 70.
When received by the data transmitting / receiving circuit 72, the data is first input to the CPU 74. The CPU 74 performs data processing / analysis useful for effectively performing resistance welding. Various processing / analysis data processed by the CPU 74 are output (display, print, etc.) by the data output circuit 80.

When the wireless transmission data from the welding condition transmitter 40 is received by the welding condition controller 26,
The wireless transmission data is output to the monitor 26d. With this monitor display, the welding data from the welding state transmitter 40 can be easily recognized. When receiving the wireless transmission data, the CPU 26a controls the drive circuit 25 to output a control signal based on the wireless transmission data. By performing feedback based on such wireless transmission data, accurate and effective resistance welding can be realized. The received wireless transmission data is stored in the ROM 26.
It may be stored in the RAM b or the RAM 26c and saved.

The welding condition transmitter 40 and the data output device 70 both include data transmission / reception circuits 68 and 72, respectively. That is, the welding state transmitter 40 has not only the transmitting function but also the receiving function, and the data output device 70 has not only the receiving function but also the transmitting function.

The data output device 70 sets the data for setting the detection condition (for example, the detection time of the above-mentioned index relating to the welding state) under which the data is to be detected in the data transmission / reception circuit 68 of the welding state transmission device 40. Can be sent to. When this detection condition setting data is transmitted, the CPU 64 of the welding state transmitting device 40 detects the index related to the welding state according to the detection condition based on the transmitted detection condition setting data.

The data output device 70 also outputs execution program data defining how to operate the welding state transmitting device 40 (for example, what kind of processing is performed by the CPU 64 described above). Can be transmitted to the data transmission / reception circuit 68. When this execution program data is transmitted, the CPU 64 causes the ROM 6
The execution program stored in 6 is rewritten. Then, when a new execution program is written in the ROM 66, the new execution program is executed.

Further, the data output device 70 sends a data signal requesting acquisition of past welding data stored in the ROM 66 of the welding state transmitting device 40 to the welding state transmitting device 40.
Can be transmitted to the data transmission / reception circuit 68. When this data request signal is transmitted, CPU 64 extracts necessary data from the past welding data stored in ROM 66. Then, control is performed so that the extracted past welding data is transmitted from the data transmitting / receiving circuit 68.

(Second Embodiment) FIG. 2 shows an explanatory view of a welding state transmitting apparatus 40 of a second embodiment and a welding state detecting system including this apparatus 40. In this system, the charging circuit 58 of the welding state transmitter 40 includes a pair of cables 44.
Are connected. Each cable 44 is connected to each of the pair of secondary side conductors 32. The pair of cables 44 are branched and connected to the A / D conversion circuit 61. The A / D conversion circuit 61 is connected to the CPU 64. As a result, it is possible to perform processing and analysis of voltage data generated between the pair of secondary side conductors 32. These points are the main characteristic points unique to the second embodiment.

Welding state transmitter 4 of the first or second embodiment
According to 0, in addition to the effects described in the above embodiment, the following effects are exhibited. (1) By using the charging toroidal coil 42 (first embodiment) or the cable 44 (second embodiment) and the charging circuit 58, the driving power can be automatically charged in the secondary battery 60. Basically, the maintenance work related to the driving power is only required to replace the secondary battery 60, which has reached the end of its life due to a large number of chargings (usually once every few years). Therefore, maintenance work is extremely easy (maintenance-free).

(2) When a plurality of welding condition transmitters of the second prior art described above are mounted on a resistance welding machine, battery replacement / charging and detection condition setting are performed for each of the plurality of resistance welding machines. Maintenance work such as rewriting the execution program is required, which is very troublesome. In contrast, the first
Alternatively, according to the welding state transmitter 40 of the second embodiment, even if a plurality of welding state transmitters are mounted on the resistance welding machine and the welding current and the like are detected at the same time, the maintenance work related to the driving power is as described above. In addition, since it is only necessary to replace the secondary battery 60 due to the life of the battery, and the setting change of the detection condition and the rewriting of the execution program can be performed by the wireless method from the data output device 70, maintenance work is not troublesome.

(3) The welding state transmitter 40 (the circuit unit 50 and the toroidal coils 42, 46) is integrated,
Since data is transmitted and received between the welding state transmitter 40 and the data output device 70 wirelessly, there is no cable between the toroidal coil and the data output device as in the above-described first conventional technique. Therefore, as the welding operation (pressurizing operation, etc.) of the welding gun 30 is performed, the cable is welded to the member W
No wire breakage of the cable or damage to the welded members W1, W2 or other parts is caused by being caught in or entangled with 1, W2 or other parts. Further, it is possible to easily detect the welding current in the state where the welding gun is sequentially moved to weld a plurality of parts.

(4) As described above, according to the welding state transmitting apparatus 40 of the first or second embodiment, the maintenance work is extremely easy, and there is a fear of a cable breakage or the like accompanying the resistance welding or the welding state detection work. Therefore, the welding state of the resistance welding machine 10 can be detected and controlled much more easily than before.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. Further, the technical elements described in the present specification or the drawings are
The technical usefulness is exerted alone or in various combinations, and is not limited to the combinations described in the claims at the time of filing. In addition, the technique illustrated in the present specification or the drawings can simultaneously achieve a plurality of objects, and achieving the one object among them has technical utility.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a welding state transmission device of a first embodiment and a welding state detection system including this device.

FIG. 2 is an explanatory diagram of a welding state transmission device of a second embodiment and a welding state detection system including this device.

[Explanation of symbols]

20: Resistance welding machine 40: Welding status transmitter 42: Toroidal coil for charging welding power 46: Toroidal coil for detecting welding current 58: charging circuit, 58a: charging control unit 60: Secondary battery 70: Data output device

Claims (9)

[Claims] 1. An apparatus for use by being attached to a secondary side of a resistance welding machine, wherein the electricity storage means stores electric power supplied to each part of the apparatus.
Charging means for charging the power storage means by using the welding power on the secondary side of the resistance welding machine, a sensor for detecting an index relating to the welding state, and a transmission means for transmitting data based on the index detected by the sensor by a wireless method. Welding state transmitting device. 2. The charging means has a coil arranged around a cable for supplying a welding current, and the coil is used to charge the power storage means.
Welding status transmitter. 3. The welding state transmitting device according to claim 1, wherein the charging means charges the power storage means by using a voltage between cables for supplying a pair of welding currents. 4. A device used by being attached to a secondary side of a resistance welding machine, the sensor detecting an index relating to a welding state, and a control means controlling so as to detect the index relating to a welding state according to a predetermined detection condition. And a receiving means for receiving data wirelessly transmitted from an external device and a transmitting means for wirelessly transmitting data based on the index detected by the sensor. A welding state transmitting device, which can be set by means based on detection condition setting data wirelessly received from an external device. 5. A device which is used by being attached to a secondary side of a resistance welding machine, wherein a storage means storing an execution program of the device, a sensor for detecting an index relating to a welding state, and a sensor for detecting the index. The execution program stored in the storage means is wirelessly transmitted from the external device by the reception means, the transmission means transmitting the data based on the index by the wireless method, and the receiving means receiving the data transmitted by the wireless method from the external device. A welding state transmitting device, which is rewritable based on the execution program data received in step 1. 6. A device used by being attached to a secondary side of a resistance welding machine, comprising: a sensor for detecting an index relating to a welding state; and a transmitting means for transmitting data based on the index detected by the sensor in a wireless manner. , Receiving means for receiving data transmitted from an external device in a wireless manner, means for accumulating and storing data based on an index detected by a sensor, and request data received by the receiving means in a wireless manner from an external device. Extract the data stored in the storage means based on
A welding state transmission device comprising control means for controlling the transmission means to transmit the extracted data. 7. The toroidal coil for detecting the differential value of the welding current, wherein the sensor is a toroidal coil.
The welding state transmission device according to any one of 1 to 6. 8. A welding state detection system comprising the welding state transmitting device according to claim 1 and a data output device, wherein the data output device receives data transmitted by a wireless method. And a calculation means for generating data to be output based on the data from the welding status transmission device received by the reception means. 9. A welding state detection system including the welding state transmission device according to claim 1, a welding state control device, and a resistance welding machine, wherein the welding state control device is transmitted wirelessly. And a control means for controlling the welding state of the resistance welding machine or a monitoring means for monitoring the welding state based on the data from the welding state transmitting device received by the receiving means. Welding condition detection system.