JP2023118629A - Welding device - Google Patents

Abstract

To provide a welding device that is improved in productivity.SOLUTION: An arc-welding device 1 is provided with a determining part 31 that when a detected result of an encoder 13 by a blowing device 10 does not satisfy a predetermined rotation condition and when a detected result by a temperature sensor 22 does not satisfy a predetermined temperature condition, determines that operation of stopping supply of electric power by a power supply circuit 21 and operation at the time of occurrence of an abnormality including operation of outputting an error display image by a display instrument 40, and otherwise, determines that the operation at the time of occurrence of an abnormality is not necessary.SELECTED DRAWING: Figure 2

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding apparatus capable of continuing operation according to temperature conditions even when a cooling fan fails.

Patent Literature 1 discloses a welding device that includes a welding power source section that supplies electric power between a welding electrode and an object to be welded, and a fan that has a plurality of blades. In this welding device, maintenance efficiency is improved by attaching a fan mounting plate for mounting the fan to the fan mounting portion so as to be openable and closable.

JP 2016-198772 A

SUMMARY OF THE INVENTION The present invention provides a welding apparatus capable of continuing operation according to temperature conditions even when a cooling fan fails.

Patent Literature 1 describes improving maintainability by making the fan mounting portion openable and closable. Description not disclosed.

The present invention provides a fan having a plurality of blades, a motor that rotates the fan, a power supply circuit that supplies power between a welding electrode and an object to be welded and that is cooled by air blown by the fan, and the a rotation detector for detecting rotation by the motor; a temperature sensor for detecting the temperature of the power supply circuit; When a predetermined temperature condition is not satisfied, an operation of stopping the power supply by the power supply circuit and an output operation by an output unit that outputs at least one of predetermined sound, image, and light. a determination unit that determines that a predetermined abnormal operation including at least one of the operations is necessary, and otherwise determines that the predetermined abnormal operation is unnecessary.

ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the productivity of a welding apparatus falls.

FIG. 1 is a schematic perspective view of an arc welding apparatus according to Embodiment 1 of the present invention. FIG. 2 is a block diagram showing the configuration of the arc welding apparatus according to Embodiment 1 of the present invention. FIG. 3 is a front view around the fan according to Embodiment 1 of the present invention. FIG. 4 is a perspective view around the power supply circuit according to Embodiment 1 of the present invention. FIG. 5(a) is a timing chart illustrating pulse signals output by the encoder according to the first embodiment of the present invention. FIG. 5(b) is a timing chart illustrating pulse signals output by the encoder according to the first embodiment of the present invention. FIG. 5(c) is a timing chart illustrating pulse signals output by the encoder according to the first embodiment of the present invention. FIG. 6 is an explanatory diagram exemplifying an error display image output by the display device according to the first embodiment of the present invention. FIG. 7 is a flow chart explaining the operation of the control device according to the first embodiment of the present invention. FIG. 8 is a flowchart for explaining the operation of the control device according to Embodiment 2 of the present invention.

(Circumstances leading to the present invention)
Conventionally, in the welding machine disclosed in Patent Document 1, the power supply circuit of the welding machine is cooled by blowing air from a fan. Here, when an abnormality such as broken blades occurs in the fan, it is necessary to stop the power supply from the power supply circuit for maintenance. However, maintenance of the welding machine often requires complicated work such as moving the welding machine from the welding site and takes a long time. Therefore, if the welding work is immediately stopped and maintenance is performed every time an abnormality such as broken blades occurs in the fan, there is a problem that the productivity deteriorates.

On the other hand, the inventors of the present application have found that even if an abnormality such as blade breakage occurs in the fan, the use of the welder can be continued depending on the temperature around the power supply circuit. Therefore, in each of the following embodiments, even if an abnormality such as broken blades has occurred in the fan, if the temperature of the power supply circuit satisfies a predetermined condition, it is determined that the operation of stopping power supply by the power supply circuit is unnecessary. A welding device configured to do so will be described.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a schematic perspective view of an arc welding apparatus 1 according to Embodiment 1. FIG. FIG. 2 is a block diagram showing the configuration of the arc welding device 1 according to Embodiment 1. As shown in FIG. This arc welding device 1 includes a blower device 10 , a power supply circuit 21 , a temperature sensor 22 , a welding electrode 23 , a control device 30 , a display 40 and a housing 50 .

As shown in FIG. 2, the blower 10 includes a fan 11, a motor 12, and an encoder 13 as a rotation detector.

FIG. 3 is a front view around the fan 11 according to the first embodiment. The fan 11, as shown in FIG. 3, has a hub 11a and a plurality of blades 11b projecting from the outer peripheral side of the hub 11a. The fan 11 is arranged in an opening 51 provided in the outer wall surface of the housing 50 so as to face the outside.

Motor 12 rotates fan 11 .

The encoder 13 is an incremental encoder that outputs a pulse signal that rises each time the motor 12 rotates by a predetermined angle as a detection result.

FIG. 4 is a perspective view around the power supply circuit 21 according to the first embodiment. The power supply circuit 21 performs power conversion on AC power sent from an AC power supply (not shown), and supplies the converted power between the welding electrode 23 and the object to be welded. Welding electrode 23 is held by a welding torch (not shown). This welding torch (not shown) is provided with a torch switch (not shown) for operating start/stop of arc welding. The power supply circuit 21 has three semiconductor components 24, as shown in FIG. The semiconductor component 24 has a semiconductor chip (not shown) and a resin package 24a that accommodates the semiconductor chip. Three semiconductor components 24 are attached to a common heat sink 25 . The heat sink 25 is made of metal with high thermal conductivity such as aluminum or copper. The heat sink 25 is composed of a rectangular main plate portion 25a and a plurality of rectangular projecting plate portions 25b projecting from one surface of the main plate portion 25a. The projecting plate portion 25b is formed over the entire longitudinal direction of the main plate portion 25a with its plate surface directed in the lateral direction of the main plate portion 25a. The three semiconductor components 24 are attached to the surface of the main plate portion 25a of the heat sink 25 on which the projecting plate portion 25b is not formed, while being spaced apart from each other in the longitudinal direction of the main plate portion 25a. A temperature sensor 22 is attached to the surface of the main plate portion 25a of the heat sink 25 on which the projecting plate portion 25b is not formed, at a location sandwiched between the two semiconductor components 24 . This temperature sensor 22 detects the temperature of the power supply circuit 21 . The heat sink 25 is accommodated in the housing 50 described above. The heat sink 25 is arranged so that air from the fan 11 flows between the projecting plate portions 25b of the heat sink 25 when the fan 11 rotates. Therefore, the power supply circuit 21 is cooled by the air blown by the fan 11 .

The control device 30 includes a determination section 31 , a display instruction section 32 and a motor control section 33 . The functions of the control device 30 are implemented by, for example, a control board equipped with a microcomputer.

5A to 5C are timing charts illustrating pulse signals output by the encoder 13 according to the first embodiment. In addition, FIG.5(b) is a timing chart when the rotation speed of the fan 11 is lower than FIG.5(a). FIG. 5(c) is a timing chart when eccentricity of the motor 12 occurs due to breakage of the blades of the fan 11 according to the first embodiment.

Based on the pulse signal output from the encoder 13 and the detection result of the temperature sensor 22, the determination unit 31 determines whether or not a predetermined abnormal operation is required. Specifically, the determination unit 31 determines whether the pulse signal output by the encoder 13 does not satisfy the pulse condition as the predetermined rotation condition and the predetermined temperature condition for the detection result of the temperature sensor 22 is satisfied. If not, it is determined that the abnormal operation is necessary. On the other hand, in other cases, the determination unit 31 determines that the abnormal operation is unnecessary. Here, the pulse condition is, for example, a timing interval INT (interval) at which a pulse signal having a waveform as shown in timing charts of FIGS. 5A to 5C is switched between high level and low level. is less than or equal to a predetermined upper threshold, and the condition that the timing interval INT is greater than or equal to a predetermined lower threshold. In other words, when the pulse signal output by the encoder 13 satisfies a predetermined pulse condition, it indicates that the blades of the fan 11 are free from defects and the rotation state of the fan 11 is stable. If the pulse condition is not satisfied, it indicates that the rotational state of the fan 11 is unstable or the amount of blown air is insufficient due to loss of blades of the fan 11 or the like.

Further, the temperature condition is that the temperature detected by the temperature sensor 22 when the arc welding apparatus 1 is started or when a predetermined time has passed after the arc welding apparatus 1 enters a standby state in which welding is not performed is a predetermined temperature threshold. and that the temperature sensed by the temperature sensor 22 when it is determined that the pulse signal does not satisfy the pulse condition is less than or equal to a predetermined operating temperature threshold. The temperature of a portion of the housing 50 that is not directly exposed to the wind of the fan 11 during the welding process is about 20° C. higher than the outside air temperature. For example, when the outside air temperature is 40° C., the power supply circuit 21 is activated to generate an arc between the welding electrode 23 and the object to be welded. It saturates at about °C. In addition, the temperature inside the housing 50 and the temperature detected by the temperature sensor 22 may change after a predetermined time (for example, 30 minutes to 60 minutes) has passed in the standby state even after the power supply circuit 21 is started. The temperature at the installation location of the is approximately the same as the outside air temperature or room temperature. Here, the "standby state" means that the operation of the torch switch (not shown) of the arc welding apparatus 1 by the user is stopped (the torch switch is in an OFF state), and the power supply circuit 21 is connected to the welding electrode 23 for welding. It is a state in which the power supply to the object is stopped. At the moment when the torch switch (not shown) is switched from ON to OFF, the welding process is shifted to the standby state. Since the air blown by the fan 11 promotes the heat dissipation from the heat sink 25, the temperature detected by the temperature sensor 22 drops faster than the temperature of other components.

Although the welding process is shifted to the standby state at the moment when the torch switch (not shown) is switched from ON to OFF, welding in which a plurality of weld beads are intermittently formed can also be treated as a continuous welding process. Then, after a predetermined time (for example, 5 to 20 minutes) has passed after the torch switch (not shown) is switched from ON to OFF, the welding process may be shifted to the standby state.

Also, the determination unit 31 determines at predetermined time intervals whether the temperature detected by the temperature sensor 22 is equal to a predetermined abnormality detection threshold. Then, when the temperature detected by the temperature sensor 22 is equal to the predetermined abnormality detection threshold, the determination section 31 causes the display instruction section 32 to output an image indicating temperature abnormality to the display 40 . The abnormality detection threshold is set about 5° C. higher than the operating temperature threshold.

In the first embodiment, assuming that the arc welding apparatus 1 is used in an environment where the outside temperature is -10°C to 40°C, the temperature threshold is set to 25°C, and the operating temperature threshold is set to 90°C to 100°C. However, the air temperature threshold and the operating temperature threshold may be set to other temperatures. As the outside air temperature (environmental temperature) drops, the temperature detected by the temperature sensor 22 also drops. The determination unit 31 stops the power supply from the power supply circuit 21 when it determines that the abnormal operation, which is the operation to deal with an abnormality, is necessary, and stops the power supply circuit 21 when it determines that the abnormal operation is unnecessary. continue to supply power from

FIG. 6 is an explanatory diagram illustrating an error display image output by the display device 40 according to the first embodiment. The display instruction unit 32 operates based on the determination by the determination unit 31 regarding the necessity of the output operation of the error display image. Specifically, the display instructing unit 32 causes the display 40 to output an error display image as shown in FIG. On the other hand, when the determination unit 31 determines that the abnormal operation is not necessary, the display instruction unit 32 does not cause the display 40 to output the error display image.

The motor control unit 33 controls the motor 12 according to the temperature detected by the temperature sensor 22 before the power supply circuit 21 starts operating. Specifically, when the temperature detected by the temperature sensor 22 before the operation of the power supply circuit 21 is higher than a predetermined temperature upper limit threshold, the motor control unit 33 controls the operation of the fan 11 before the start of welding, compared to when the temperature is lower than the temperature upper limit threshold. The motor 12 is controlled to increase the rotational speed.

The display 40 is an FPD (flat panel display) such as a liquid crystal display, and outputs an error display image as shown in FIG. That is, in the first embodiment, the abnormal operation is an operation of stopping power supply by the power supply circuit 21 and an operation of outputting an error display image by the display 40 . As the display 40, a 7-segment LED display may be used as long as the display contents can be matched.

Next, main operations of the arc welding apparatus 1 configured as described above will be described with reference to the flowchart of FIG. FIG. 7 is a flow chart for explaining the operation of the control device 30 of the first embodiment.

First, the arc welding device 1 is started. At this time, the power supply circuit 21 is in a standby state and has not started supplying power between the welding electrode 23 and the object to be welded. Next, in ( S<b>101 ), the determination unit 31 of the control device 30 stores the temperature detected by the temperature sensor 22 . After that, the determination unit 31 receives the temperature detected by the temperature sensor 22 at predetermined intervals (for example, every second).

When the arc welding apparatus 1 is started, the power supply circuit 21 is in a standby state, and power supply between the welding electrode 23 and the object to be welded is not started, the detection result of the temperature sensor 22 is , the temperature corresponding to the ambient temperature or room temperature of the arc welding apparatus 1 at the location where the arc welding apparatus 1 is used. Further, even after the power supply circuit 21 is started, the temperature detected by the temperature sensor 22 changes from the outside air temperature or Decrease to about the same temperature as room temperature.

Restarting the arc welding device 1 when a predetermined time (for example, one hour) has passed in the standby state corresponds to starting the arc welding device 1 at the start of the operation of the flowchart of FIG.

Next, in (S102), the determination unit 31 determines whether or not the welding process is in progress, in which an arc has started to be generated between the welding electrode 23 and the object to be welded. If it is during the welding process, it proceeds to (S103), and if it is not during the welding process, it executes (S102) again. Here, "during the welding process" means that the user operates the torch switch (not shown) of the arc welding apparatus 1, and power is not supplied between the welding electrode 23 and the object to be welded. It means that it is in a certain state (the torch switch is in the ON state).

In (S103), the determination unit 31 receives the pulse signal output by the encoder 13, determines whether the pulse signal output by the encoder 13 satisfies a predetermined pulse condition, and determines if the pulse signal satisfies a predetermined pulse condition. executes the operation of (S102) again. On the other hand, if the condition is not satisfied, the process proceeds to (S104). Specifically, when the interval INT between the timings at which the pulse signal is switched between the high level and the low level is equal to or less than the predetermined upper threshold and the interval INT is equal to or more than the predetermined lower threshold, again (S102 ). On the other hand, if the interval INT exceeds the predetermined upper limit threshold or is below the predetermined lower limit threshold, the process proceeds to (S104).

In (S104), the determination unit 31 determines that the temperature stored in advance when executing the process of (S101) is less than a predetermined temperature threshold and the current temperature detected by the temperature sensor 22 (specifically, a pulse A determination is made as to whether the temperature condition is met such that the temperature detected by the temperature sensor 22 when the signal is determined not to meet the pulse condition is less than or equal to a predetermined operating temperature threshold. Then, when the temperature condition is satisfied, the power supply circuit 21 continues to supply power between the welding electrode 23 and the object to be welded, and the operation of (S102) is executed again. On the other hand, if the temperature condition is not satisfied, the process proceeds to (S105). That is, in the operation of the flowchart of FIG. 7, when the temperature stored in (S101) is less than the predetermined temperature threshold and the temperature detected by the current temperature sensor 22 is less than or equal to the predetermined operating temperature threshold, , the operation of (S102) is executed again while the power supply circuit 21 continues to operate. On the other hand, if the temperature stored in (S101) is equal to or higher than the predetermined temperature threshold, or if the temperature detected by the current temperature sensor 22 exceeds the predetermined operating temperature threshold, the process proceeds to (S105).

In (S105), the determination unit 31 determines that a predetermined abnormal operation is required. Then, determination unit 31 causes power supply circuit 21 to stop supplying power between welding electrode 23 and the object to be welded. Further, the display instruction unit 32 causes the display device 40 to output an error display image as shown in FIG.

Further, if the recently stored temperature as the outside air temperature for the arc welding apparatus 1 in (S101) is, for example, 25° C. or more and the pulse conditions are not satisfied in (S103) during the welding process, blade breakage occurs. If the temperature condition is not satisfied in (S104), the process of (S105) stops the supply of electric power between the welding electrode 23 and the object to be welded.

Further, when the outside air temperature is, for example, 40° C. in (S101), the temperature sensor 22 provided in the power supply circuit 21 rises to about 80° C. to 90° C. during the welding process. In the first embodiment, when the pulse condition is not satisfied in (S103) during the welding process and the temperature of the temperature sensor 22 exceeds 90° C. in (S104), the welding electrode 23 is and the work piece to be welded.

In addition to the processing of the flowchart of FIG. 7, the determination unit 31 determines whether or not the temperature detected by the temperature sensor 22 is a predetermined abnormality detection threshold value at predetermined time intervals. Then, when the temperature detected by the temperature sensor 22 is equal to the predetermined abnormality detection threshold, the determination section 31 causes the display instruction section 32 to output an image indicating temperature abnormality to the display 40 .

Therefore, according to the first embodiment, the determination unit 31 determines whether or not the abnormal operation is necessary based on the pulse signal output by the encoder 13 and the detection result of the temperature sensor 22 that detects the temperature of the power supply circuit 21. do. The pulse signal output by the encoder 13 of the motor 12 reflects whether or not an abnormality such as broken blades has occurred. Moreover, the detection result of the temperature sensor 22 is the temperature corresponding to the air temperature of the place where the arc welding apparatus 1 is used. When the temperature of the power supply circuit 21 satisfies a predetermined condition, it is determined that the operation of stopping the power supply by the power supply circuit 21 is unnecessary. As a result, even if an abnormality such as blade breakage occurs in the fan 11, that is, even if the detection result of the determination unit 31 does not satisfy the predetermined rotation condition, the detection result of the temperature sensor 22 satisfies the predetermined temperature condition. If so, power supply from the power supply circuit 21 can be continued. Therefore, it is possible to prevent the productivity of the arc welding device 1 from decreasing.

Further, the temperature detected by the temperature sensor 22 when the arc welding apparatus 1 is started, that is, before the operation of the power supply circuit 21 is started, is hardly affected by the operation of the power supply circuit 21 due to arc generation during the welding process. As air temperature, it becomes almost equal to the air temperature at the place where the arc welding apparatus 1 is used. In the embodiment, the determining unit 31 determines whether or not the abnormal operation is necessary based on the temperature detected by the temperature sensor 22 when the arc welding apparatus 1 is started. The temperature of the place where the welding device 1 is used can be reflected more strictly.

Specifically, even if the pulse signal does not satisfy the pulse conditions due to a failure of the fan 11, the temperature sensor 22 is detected when the arc welding apparatus 1 is started or when a predetermined time has elapsed since it was determined that the welding process was not in progress. is less than the predetermined air temperature threshold and the pulse signal does not satisfy the pulse conditions, during the welding process, the temperature detected by the temperature sensor 22 exceeds the predetermined operating temperature When the temperature is equal to or less than the temperature threshold, the power supply circuit 21 does not stop supplying power (operating), and the display 40 does not output an error display image. Therefore, the user can continue welding work.

Further, in the first embodiment, the motor control unit 33 determines whether the temperature detected by the temperature sensor 22 before the operation of the power supply circuit 21 as the outside air temperature or the room temperature is higher than a predetermined air temperature upper limit threshold. In contrast, since the rotation speed of the fan 11 is increased before welding is started, the rotation speed of the fan 11 can be relatively reduced when the outside temperature is relatively low and the temperature is equal to or lower than the predetermined upper limit temperature threshold.

(Embodiment 2)
FIG. 8 is a flowchart for explaining the operation of the control device 30 according to the second embodiment. In the second embodiment, when the determining unit 31 determines that the welding process is in progress in (S102), the process proceeds to (S201). In (S201), the determination unit 31 determines whether or not the welding current is less than a predetermined current threshold. For example, when the rated current of the welding current is 350A, the current threshold is set to 0.25 to 0.3 times the rated current, for example, 90A to 100A. Then, when the welding current is less than the predetermined current threshold, the determination unit 31 proceeds to (S202). On the other hand, when the welding current is equal to or higher than the predetermined current threshold, the process proceeds to (S203). When the welding current is less than the predetermined current threshold, in (S202), determination unit 31 sets the operating temperature threshold to a first threshold higher than the second threshold, and proceeds to (S103). If the welding current is greater than or equal to the predetermined current threshold, in (S203) the determination unit 31 sets the operating temperature threshold to a second threshold lower than the first threshold, and proceeds to (S103). When the heat resistance temperature of the semiconductor component 24 of the power supply circuit 21 is approximately 125° C. or less, for example, the first threshold is set to 95° C. to 105° C., and the second threshold is approximately 10° C. higher than the first threshold. Set at low 85°C-95°C.

Since other operations are the same as those of the first embodiment, common operations are denoted by the same reference numerals and detailed descriptions thereof are omitted.

As described above, in the second embodiment, the operating temperature threshold is set higher when the welding current is less than the predetermined current threshold than when the welding current is equal to or greater than the predetermined current threshold. As a result, when the welding current is less than the predetermined current threshold value, that is, when the temperature rise of the power supply circuit 21 is relatively slow, the abnormal operation is suppressed in a situation where maintenance is not required, thereby reducing maintenance. The number of times can be reduced and productivity can be improved.

In Embodiments 1 and 2, the temperature condition includes (S101), that is, the condition that the temperature detected by the temperature sensor 22 before the start of operation of the power supply circuit 21 is less than the predetermined temperature threshold. Alternatively, the condition may include a condition that the temperature detected by the temperature sensor 22 after a predetermined time has elapsed since the power supply circuit 21 was stopped is less than a predetermined temperature threshold. In addition, in one arc welding apparatus 1, in certain situations, the temperature condition includes a first condition that the temperature detected by the temperature sensor 22 before the start of operation of the power supply circuit 21 is less than a predetermined temperature threshold. In other situations, instead of the first condition, the temperature condition may include a second condition that the temperature detected by the temperature sensor 22 after a predetermined time has elapsed since the power supply circuit 21 was stopped is less than a predetermined temperature threshold. may be included. The temperature detected by the temperature sensor 22 after a predetermined time has passed since the power supply circuit 21 was stopped is approximately the outside temperature of the place where the arc welding apparatus 1 is used when the predetermined time is set to be sufficiently long, for example, 30 to 60 minutes. be equal.

Further, in the second embodiment, in (S201), the determination unit 31 is caused to determine whether or not the welding current is less than the predetermined current threshold. However, instead of this, in (S201), the determination unit 31 is caused to determine whether or not the welding voltage is less than the predetermined voltage threshold. Specifically, the welding voltage is less than the predetermined voltage threshold. If the welding voltage is equal to or higher than a predetermined voltage threshold, the process may proceed to (S203). As a result, when the welding voltage is less than the predetermined voltage threshold, that is, when the temperature rise of the power supply circuit 21 is relatively slow, the abnormal operation is suppressed in a situation in which maintenance is not required, thereby reducing maintenance. The number of times can be reduced and productivity can be improved.

Further, in Embodiments 1 and 2 above, in the flowcharts of FIGS. The operation may be performed even while the power supply circuit 21 is stopped. In the flowcharts of FIGS. 7 and 8, even if the pulse signal does not satisfy the predetermined pulse conditions, if the detection result of the temperature sensor 22 satisfies the predetermined temperature conditions, the abnormal operation is not executed. However, when the pulse signal does not satisfy the predetermined pulse condition, even if the detection result of the temperature sensor 22 satisfies the predetermined temperature condition, if the power supply circuit 21 is stopped, the display 40 indicates the pulse condition You may make it output the error display image with respect to.

Further, in the first and second embodiments, when the determining unit 31 determines that the temperature condition is satisfied in (S104), the operation of the power supply circuit 21 is continued and the operation of (S102) is performed again. I made it However, in (S104), if the determination unit 31 determines that the temperature condition is satisfied, the operation of (S102) is performed again by continuing the operation of the power supply circuit 21, and in addition, output prompting fan replacement is performed. The image may be output to the display 40 . Further, the operation at the time of abnormality may not include the operation of outputting the error display image by the display 40, and may be only the operation of stopping the power supply by the power supply circuit 21, for example. Then, regardless of the detection result of the temperature sensor 22, the determination unit 31 determines that the output operation of the error display image by the display 40 is necessary when the pulse signal does not satisfy the predetermined pulse condition. On the other hand, if the pulse signal satisfies the predetermined pulse condition, it may be further determined that the output operation is unnecessary. Thereby, the user can recognize the abnormality of the fan 11 and perform maintenance of the fan 11 during off-time when the arc welding apparatus 1 is not used.

Also, the operation in the event of an abnormality may be only the output operation of the error display image by the display 40 . For example, the determination unit 31 may not determine whether or not the power supply circuit 21 should stop the power supply, and the user may always determine whether or not the power supply should be stopped.

Further, in the first and second embodiments and the modified examples, the arc welding apparatus 1 is provided with an output unit for outputting at least one of a predetermined sound and light instead of the display 40, and an error display image is displayed. Alternatively, the output unit may output at least one of predetermined sound and light. Also, an output unit for outputting at least one of a predetermined sound and light and a display 40 are provided, and both the output of at least one of the sound and light and the output of the error display image are provided. may cause the user to recognize the abnormality.

Further, in Embodiments 1 and 2 and the modified example, the pulse condition is that the interval INT is equal to or less than the predetermined upper threshold and the interval INT is equal to or more than the predetermined lower threshold. Either the condition that the interval INT is equal to or less than a predetermined upper limit threshold or the condition that the interval INT is equal to or more than a predetermined lower limit threshold may be set.

Further, in the first and second embodiments and the modified example, the indicator 40 is provided as a part of the arc welding apparatus 1 as an output section, but it may be provided separately from the arc welding apparatus 1 .

In the first and second embodiments and the modification, the encoder 13 is provided in the blower device 10 as a rotation detector. Based on this, a fan sensor that detects rotation of the motor 12 through a predetermined angle may be provided as the rotation detector.

INDUSTRIAL APPLICABILITY The present invention is useful as a technology that can improve the productivity of a welding apparatus and that allows a welding apparatus having a fan to continue operation according to temperature conditions even if the fan fails.

1 arc welding equipment
10 blower
11 Fan
11a Hub
11b Feather
12 motor
13 encoder (rotation detector)
21 power circuit
22 temperature sensor
23 welding electrode
24 semiconductor parts
24a package
25 heat sink
25a main plate
25b projecting plate
30 control device
31 decision unit
32 display indicator
33 motor control unit
40 indicator
50 housing
51 opening

Claims (8)

a fan having a plurality of blades;
a motor that rotates the fan;
a power supply circuit that supplies electric power between the welding electrode and the object to be welded and that is cooled by the air blown by the fan;
a rotation detection unit that detects rotation by the motor;
a temperature sensor that detects the temperature of the power supply circuit;
When the detection result of the rotation detection unit does not satisfy a predetermined rotation condition and the predetermined temperature condition of the detection result of the temperature sensor is not satisfied, the power supply circuit stops supplying power. determining that a predetermined abnormal operation including at least one of an operation and an output operation by an output unit that outputs at least one of a predetermined sound, image, and light is necessary; and a determination unit that determines that the predetermined abnormal operation is not necessary in a case other than the above. The temperature condition includes a condition that the temperature detected by the temperature sensor is less than a predetermined temperature threshold before the power supply circuit starts operating or after a predetermined time has passed since the power supply circuit is stopped. The welding device according to claim 1. The temperature condition includes a condition that the temperature detected by the temperature sensor when it is determined that the detection result of the rotation detection unit does not satisfy the predetermined rotation condition is equal to or less than a predetermined operating temperature threshold. The welding device according to claim 1 or 2, characterized in that: The rotation detection unit outputs a pulse signal that rises each time the motor rotates by a predetermined angle,
The pulse conditions include a condition that a timing interval at which the pulse signal is switched between a high level and a low level is equal to or less than a predetermined upper threshold, and a condition that the timing interval is equal to or greater than a predetermined lower threshold. The welding device according to any one of claims 1 to 3, comprising at least one of 5. The welding device according to claim 4, wherein the determination unit determines whether or not the predetermined abnormal operation is necessary based on at least one of welding current and welding voltage. The welding according to any one of claims 1 to 5, further comprising a motor control section that controls the motor according to the temperature detected by the temperature sensor before the power supply circuit starts operating. Device. The motor control unit increases the rotation speed of the fan before starting welding when the temperature detected by the temperature sensor before the operation of the power supply circuit is higher than a predetermined temperature upper limit threshold, compared to when the temperature is lower than when the temperature is lower. 7. The welding device according to claim 6, wherein said motor is controlled so as to the predetermined abnormal operation does not include the output operation,
The determination unit determines that the output operation is necessary when the detection result of the rotation detection unit does not satisfy the predetermined rotation condition, and determines that the output operation is necessary when the detection result of the rotation detection unit does not satisfy the predetermined rotation condition. The welding device according to any one of claims 1 to 7, further determining that the output operation is unnecessary when the condition is satisfied.