CN112313027A - Arc welding machine - Google Patents
Arc welding machine Download PDFInfo
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- CN112313027A CN112313027A CN201980042005.1A CN201980042005A CN112313027A CN 112313027 A CN112313027 A CN 112313027A CN 201980042005 A CN201980042005 A CN 201980042005A CN 112313027 A CN112313027 A CN 112313027A
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- load
- power
- unit
- arc welding
- temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding Control (AREA)
Abstract
A power calculation unit (41) calculates power consumption consumed in a predetermined unit time, based on a load current detected by a load current detection unit (31) and a load voltage detected by a load voltage detection unit (32). A comparison unit (42) compares the power consumption with a predetermined power threshold. When the power consumption is greater than the power threshold, the abnormality determination unit (40) determines that the output of the load power is abnormal.
Description
Technical Field
The invention relates to an electric arc welding machine.
Background
Conventionally, in a power supply device used for an arc welding machine or the like, an output power is adjusted by controlling a switching operation of a switching element constituting an inverter circuit (for example, see patent document 1).
Patent document 1 discloses a configuration in which a temperature sensor is disposed in the vicinity of an inverter circuit in order to protect a switching element from overheating, and a switching operation is stopped based on detection of an overheated state of the switching element by the temperature sensor.
Prior art documents
Patent document
Patent document 1: japanese patent No. 5897381
Disclosure of Invention
Problems to be solved by the invention
However, in the conventional welding power supply device, depending on the welding method and welding conditions, when a high load equal to or higher than the rated load of the equipment is generated, there is a possibility that the internal temperature of the power supply device exceeds the allowable value.
Specifically, in the welding power supply, as the rated load, for example, a load current is 350A, a load voltage is 36V, and a usage rate is 60%. However, depending on the welding method and welding conditions, a high load having a load current of 520A and a load voltage of about 40V may be generated for 2ms under a condition of low usage rate (or instantaneous), for example, during pulse welding.
At this time, a rapid heat concentration occurs due to a high load exceeding the rated load, and the internal temperature of the power supply device becomes high. Therefore, the switching operation of the switching element is not stopped, and the temperature of each component inside the device is exceeded, which may cause the welding power supply to break.
The present invention has been made in view of the above circumstances, and an object thereof is to enable overheat protection of a device when a high load equal to or higher than the rating of the device is generated.
Means for solving the problems
The present disclosure is directed to an arc welding machine for performing arc welding by supplying a load power to a machining load including an electrode for arc welding and a base material, and adopts the following solution.
That is, the 1 st aspect is characterized by including:
a load current detection unit that detects a load current supplied to the machining load;
a load voltage detection unit that detects a load voltage supplied to the machining load;
a power calculation unit that calculates power consumption consumed in a predetermined unit time, based on the load current and the load voltage; and
and an abnormality determination unit that determines that the output of the load power is abnormal when the power consumption is greater than a predetermined power threshold.
In the 1 st mode, the consumed power consumed in a given unit time is calculated from the load current and the load voltage. When the power consumption is greater than a predetermined power threshold, it is determined that the output of the load power is abnormal.
Specifically, in the power supply of the arc welding machine, as the rated load, for example, the load current is 350A, the load voltage is 36V (or, in the specification, the load current is 350A, the load voltage is 31.5V), and the usage rate is 60%. Here, the so-called usage rate indicates a ratio of time during which an arc is actually generated to time during which an arc welder is used. For example, in the case of using a welder for 10 minutes, the arc generation time is 6 minutes and the rest time is 4 minutes.
However, under a condition of low usage rate (or instantaneous rate), for example, in pulse welding, a high load with a load current of 520A and a load voltage of about 40V may occur for 2 ms.
Therefore, when the cumulative value of the load power per unit time (for example, 10 minutes), that is, the consumed power consumed per unit time becomes larger than a predetermined power threshold value while the state of the load power of the arc welding machine is constantly monitored, it is determined that the output of the load power is abnormal, and, for example, the arc welding machine may be stopped urgently or an operator may be warned by an alarm or an error message. The unit time may be, for example, 1 minute or 5 minutes, as long as it can be arbitrarily set.
Here, the power threshold for abnormality determination may be set, for example, in accordance with an allowable temperature of the main semiconductor in the device. Further, the rated load may be set to 12.6kW at (350 × 36)/1000.
Thus, even in the case where a transient high load exceeding the rated standard load characteristic of the arc welding machine is generated, the arc welding machine can be protected from overheating.
The feature of the 2 nd aspect is that, in the 1 st aspect,
the disclosed device is provided with: an output control unit for controlling the supply operation of the load power to the machining load,
the output control unit stops the supply operation of the load power when the abnormality determination unit determines that the load power is abnormal.
In the case of the 2 nd aspect, when it is determined that the output of the load power is abnormal, the supply operation of the load power is stopped, and thereby the temperature in the equipment is suppressed from further increasing, and the equipment can be protected so that each component in the equipment does not exceed the allowable temperature value.
The feature of the 3 rd embodiment is that, in the 1 st or 2 nd embodiment,
the disclosed device is provided with: a temperature detection unit for detecting the temperature around the device,
the abnormality determination unit calculates a difference value between the detected temperature detected by the temperature detection unit and a predetermined temperature threshold, and changes the power threshold based on the difference value.
In the 3 rd aspect, the power threshold value used for abnormality determination is changed based on the difference between the detected temperature around the device and the predetermined temperature threshold value. Thus, the device can be protected in accordance with the temperature around the device.
Specifically, when the temperature around the equipment is low, for example, when the equipment is used in a cold district or the like, even if a high load equal to or higher than the rating of the equipment occurs and a switch unit or the like in the equipment generates heat, the heat generating component is cooled and the temperature drops, and therefore, there is a margin before the allowable temperature value of the equipment is exceeded.
Therefore, by changing the power threshold value for abnormality determination to be larger as the difference value between the detected temperature around the device and the temperature threshold value is larger, it is possible to suppress determination as an abnormality despite the temperature allowable value of the device being surplus. This makes it possible to protect the device while stabilizing the output of the load power.
Effects of the invention
According to the aspect of the present disclosure, when a high load equal to or higher than the rated load of the equipment occurs, the equipment can be protected from overheating.
Drawings
Fig. 1 is a schematic diagram showing the structure of an arc welding machine according to embodiment 1.
Fig. 2 is a schematic diagram showing the structure of an arc welding machine according to embodiment 2.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
EXAMPLE 1
As shown in fig. 1, an arc welding machine 10 performs arc welding by supplying load power to a processing load 13 including an electrode 11 for arc welding and a base material 12. An ac power supply 15 is connected to an input terminal 16 of the arc welding machine 10. The arc welding machine 10 includes a power converter 20 that converts ac power from the ac power supply 15 into load power.
The power conversion unit 20 includes: an input rectifying unit 21 for rectifying ac power of the ac power supply 15 into dc power; a switch unit 22 for converting the output power of the input rectifying unit 21 into ac power of a predetermined frequency; a transformer unit 23 for stepping down the output voltage of the switching unit 22; an output rectifying unit 24 for rectifying the output power of the transformer unit 23 into a direct-current load power to be supplied to the electrode 11; and a reactor 25 for suppressing harmonics of the output power of the output rectifier 24.
A cable 26 connected to the base material 12 is connected to the output side of the output rectifying unit 24. A cable 26 connected to the electrode 11 is connected to the output side of the dc reactor 25.
The arc welding machine 10 is provided with a load current detection unit 31 that detects a load current supplied to the machining load 13 and a load voltage detection unit 32 that detects a load voltage supplied to the machining load 13.
The load current detection unit 31 is connected to the output side of the output rectifying unit 24. Load voltage detection lines 33 wired from the vicinity of electrode 11 and the vicinity of base material 12 are connected to load voltage detection unit 32.
The load current detected by the load current detection unit 31 and the load voltage detected by the load voltage detection unit 32 are input to the output control unit 34. The output control unit 34 outputs a control signal to the switching unit 22 based on the load current and the load voltage, and performs feedback control on the operation of the switching unit 22 so that load power for performing arc welding appropriately can be obtained.
A temperature sensor 35 is disposed around the switch unit 22. The temperature detected by the temperature sensor 35 is input to the output control unit 34. When the detected temperature exceeds the allowable temperature value of each member, the output control unit 34 stops the operation of the switch unit 22.
However, in the conventional arc welding machine, depending on the welding method and welding conditions, when a high load equal to or higher than the rated load of the equipment is generated, the internal temperature of the equipment may exceed the allowable value.
Specifically, although a rapid heat concentration occurs due to a high load exceeding the rated load, the internal temperature of the equipment becomes high, but it is difficult to detect the rapid temperature change sensitively by the temperature sensor 35. Therefore, the switching operation of the switching unit 22 is not stopped, and the temperature of each component inside the apparatus exceeds the allowable temperature, and the arc welding machine 10 may be damaged.
Therefore, in the present embodiment, it is made possible to determine an abnormality in the output of the load power from the accumulated value of the load power consumed by the machining load 13.
Specifically, the arc welding machine 10 is provided with an abnormality determination unit 40. The abnormality determination unit 40 includes a power calculation unit 41 and a comparison unit 42. The abnormality determination unit 40 receives a signal indicating the load current detected by the load current detection unit 31 and a signal indicating the load voltage detected by the load voltage detection unit 32.
The power calculation unit 41 calculates the load power consumed by the machining load 13 by multiplying the load current and the load voltage. Here, the power calculation unit 41 calculates a power consumption consumed in a unit time, which is an accumulated value of the load power per a predetermined unit time (for example, 10 minutes).
The comparison unit 42 compares the power consumption calculated by the power calculation unit 41 with a predetermined power threshold. The given power threshold may be set, for example, according to an allowable temperature of the main semiconductor inside the device. Further, the load may be set to 12.6kW (350 × 36)/1000 according to the rated load of the arc welding machine 10 (for example, the load current is 350A and the load voltage is 36V).
The abnormality determination unit 40 determines an abnormality in the output of the load power based on the comparison result of the comparison unit 42. Specifically, in the abnormality determination unit 40, when the power consumption consumed in a given unit time is larger than a given power threshold value, it is determined that an overload or the like occurs due to instantaneous exceeding of the rating, and it is determined that the output of the load power is abnormal.
When determining that the output of the load power is abnormal, the abnormality determination unit 40 outputs an abnormality signal to the output control unit 34. The output control unit 34 stops the supply operation of the load power to emergency stop the arc welding machine 10 or warns the operator with an alarm or an error message, for example, based on the determination result of the abnormality determination unit 40.
As described above, according to the arc welding machine 10 of the present embodiment, even when a transient high load exceeding the rated standard load characteristic is generated, the arc welding machine 10 can be protected from overheating.
EXAMPLE 2
Fig. 2 is a schematic diagram showing the structure of an arc welding machine according to embodiment 2. Hereinafter, the same portions as those in embodiment 1 are denoted by the same reference numerals, and only different points will be described.
As shown in fig. 2, the arc welding machine 10 includes a temperature detection unit 43 that detects the temperature around the equipment. A signal indicating the detected temperature detected by the temperature detector 43 is input to the abnormality determination unit 40.
The abnormality determination unit 40 calculates a difference value between the detected temperature detected by the temperature detection unit 43 and a predetermined temperature threshold value. The temperature threshold may be set to a rated temperature (for example, 40 ℃) around the device. The abnormality determination unit 40 changes the power threshold for abnormality determination based on the difference between the detected temperature and the temperature threshold.
Specifically, when the temperature around the equipment is low, for example, when the equipment is used in a cold district or the like, even if a high load equal to or higher than the rated load of the equipment occurs and the switch unit 22 in the equipment generates heat, the switch unit 22 is cooled and the temperature drops, and therefore, there is a margin before the temperature of the equipment exceeds the allowable temperature value.
Therefore, the abnormality determination unit 40 changes such that the power threshold value used for abnormality determination is increased as the difference value between the detected temperature around the device and the temperature threshold value is increased.
For example, when the temperature threshold is 40 ℃ and the temperature around the device is 30 ℃, the difference value becomes 10 ℃, but when the temperature around the device is 0 ℃, the difference value becomes 40 ℃. Therefore, when the differential value is 40 ℃, the power threshold value is changed to be larger than when the differential value is 10 ℃, thereby suppressing the determination as an abnormality despite the temperature allowable value of the device being more abundant. This makes it possible to protect the device while stabilizing the output of the load power.
Industrial applicability
As described above, the present invention is extremely useful and has high industrial applicability because it can provide a highly practical effect of enabling overheat protection of equipment when a high load equal to or higher than the rated load of the equipment is generated.
Description of the reference numerals
10: an arc welding machine;
11: an electrode;
12: a base material;
13: processing load;
31: a load current detection unit;
32: a load voltage detection unit;
34: an output control section;
40: an abnormality determination unit;
41: a power calculation unit;
43: a temperature detection unit.
Claims (3)
1. An arc welding machine for performing arc welding by supplying a load power to a machining load including an electrode for arc welding and a base material, the arc welding machine comprising:
a load current detection unit that detects a load current supplied to the machining load;
a load voltage detection unit that detects a load voltage supplied to the machining load;
a power calculation unit that calculates power consumption consumed in a predetermined unit time, based on the load current and the load voltage; and
and an abnormality determination unit that determines that the output of the load power is abnormal when the power consumption is greater than a predetermined power threshold.
2. The arc welding machine of claim 1,
the disclosed device is provided with: an output control unit for controlling the supply operation of the load power to the machining load,
the output control unit stops the supply operation of the load power when the abnormality determination unit determines that the load power is abnormal.
3. The arc welding machine of claim 1 or 2,
the disclosed device is provided with: a temperature detection unit for detecting the temperature around the device,
the abnormality determination unit calculates a difference value between the detected temperature detected by the temperature detection unit and a predetermined temperature threshold, and changes the power threshold based on the difference value.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018126070 | 2018-07-02 | ||
| JP2018-126070 | 2018-07-02 | ||
| PCT/JP2019/007596 WO2020008679A1 (en) | 2018-07-02 | 2019-02-27 | Arc welder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112313027A true CN112313027A (en) | 2021-02-02 |
Family
ID=69059575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980042005.1A Pending CN112313027A (en) | 2018-07-02 | 2019-02-27 | Arc welding machine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2020008679A1 (en) |
| CN (1) | CN112313027A (en) |
| WO (1) | WO2020008679A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10143257A (en) * | 1996-11-08 | 1998-05-29 | Sansha Electric Mfg Co Ltd | Electric power unit |
| JP2008113477A (en) * | 2006-10-30 | 2008-05-15 | Fujitsu Access Ltd | Electronic thermal device |
| JP2016140885A (en) * | 2015-02-02 | 2016-08-08 | 株式会社ダイヘン | Power supply device, and welding power supply device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7126051B2 (en) * | 2017-07-25 | 2022-08-26 | パナソニックＩｐマネジメント株式会社 | arc welder |
-
2019
- 2019-02-27 CN CN201980042005.1A patent/CN112313027A/en active Pending
- 2019-02-27 JP JP2020528684A patent/JPWO2020008679A1/en active Pending
- 2019-02-27 WO PCT/JP2019/007596 patent/WO2020008679A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10143257A (en) * | 1996-11-08 | 1998-05-29 | Sansha Electric Mfg Co Ltd | Electric power unit |
| JP2008113477A (en) * | 2006-10-30 | 2008-05-15 | Fujitsu Access Ltd | Electronic thermal device |
| JP2016140885A (en) * | 2015-02-02 | 2016-08-08 | 株式会社ダイヘン | Power supply device, and welding power supply device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2020008679A1 (en) | 2021-07-15 |
| WO2020008679A1 (en) | 2020-01-09 |
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