JPS632227Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a welding current adjustment unit testing device for an AC arc welding machine that tests whether the welding current adjustment unit that increases or decreases the welding current of an AC arc welding machine operates normally. It is an object of the present invention to make it possible to test the adjustment section easily and in a short time.

Generally, a welding current adjustment section that automatically adjusts the welding current of an AC arc welding machine is configured as follows.

That is, a short circuit consisting of a half-wave rectifier diode connected to one output terminal of an AC arc welding machine so as to be freely connected and disconnected, and a short circuit of the short circuit to the base material connected to the other output terminal of the welding machine. a signal detector that detects the direction of a signal current flowing in a welding cable and outputs a direction detection signal; and a control that outputs a forward and reverse control signal in accordance with the forward and reverse directions of the signal current, respectively, based on the direction detection signal. 1, a transistor that is turned on by each of the control signals, and a relay that drives a current adjustment motor that is excited and operated by turning on both of the transistors.

By the way, when it becomes necessary to increase or decrease the welding current during welding using an AC arc welding machine equipped with such a welding current adjustment section, the welding operator should
At the welding site, the short circuit is attached to, for example, a torch holder and connected to one output terminal of a welding machine, and by shorting the short circuit to the base metal, the transistor of the welding current adjustment section is turned on and the current is adjusted. The welding current is adjusted at the welding site by operating the current adjustment motor and rotating the current adjustment motor in the forward or reverse direction to increase or decrease the welding current.

Conventionally, when determining the quality of the welding current adjustment section, the relays, transistors, and other circuit elements that make up the welding current adjustment section were each inspected using a tester, which took a long time and was very time consuming. The disadvantage is that it is time-consuming and the reliability of the test results is low.

Moreover, since there are many places to be tested by the tester, it will take an extremely long time for those who are not experienced, and requires considerable skill.

This invention was made with the above-mentioned points in mind, and includes a short circuit consisting of a half-wave rectifier diode that is freely connected to one output terminal of an AC arc welding machine, and the other output terminal of the welding machine. a signal detector configured to detect the direction of a signal current flowing through a welding cable by short-circuiting the short circuit to a base material connected to an output terminal and output a direction detection signal; a control unit that outputs a positive control signal and a reverse control signal in response to each of the reverse directions; a transistor that is turned on by each of the control signals; and a relay that is excited and activated when both of the transistors are turned on and drives a current adjustment motor. In an AC arc welding machine welding current adjustment unit test device for testing the operation of the welding current adjustment unit of an AC arc welding machine equipped with a test shunt consisting of a half-wave rectifier diode connected to an AC power source, and a signal generating section configured by a current transformer that outputs an operating signal to the control section according to the direction of the current flowing through the shunt; and an adjusting section that is connected to an output terminal of the adjusting section and receives the operating signal. This is a test device for the welding current adjustment section of an AC arc welding machine, which is equipped with an indicator that operates when the

Therefore, the effects of the testing device for the welding current adjustment section of an AC arc welding machine according to this invention are as follows.

In other words, the welding current adjustment section can be operated on a trial basis by inputting an activation signal similar to the direction detection signal input during actual use to the welding current adjustment section using the signal generation section. It is possible to test whether or not the device is working normally under the same conditions as the actual condition, and if it is normal, the display can indicate that it is normal.
It is possible to easily judge whether the welding current adjustment part is good or bad, and the welding current adjustment section can be tested easily and in a short time without requiring any skill.

Next, this invention will be explained in detail with reference to drawings showing one embodiment thereof.

First, FIGS. 1 to 3 showing one embodiment will be explained.

In the drawing, 1 to 3 are the first to third power supply terminals connected to a 220V AC power source (not shown), and 4 is each power supply terminal 1 to 3 connected via a no-fuse breaker 5.
The first to third connection terminals 4', 4'', 4 connected to
6 and 7 are the fourth and fifth power supply terminals connected to a 110V AC power supply (not shown), and 8 is the fourth and fifth power supply terminals connected to the no-fuse breaker 9. The first and second terminals connected to power supply terminals 6 and 7
A second connection with connection terminals 8', 8'', 10
Both ends of the next winding are connected to both connection terminals 8' of the second connection part 8,
8″ slider, which is a voltage regulator connected to
11 is a first AC voltmeter whose both ends are connected to one end of the secondary winding of the slider 10 and the movable terminal;
12 is a first switch consisting of two interlocking switches each having one end connected to both ends of the first voltmeter 11; 13 is a second switch having one end connected to the other end of one interlocking switch of the first switch 12; , 14
1 is an AC relay to be tested in which both ends of the relay coil are connected to the other end of the second switch 13 and the other end of the other interlocking switch of the first switch 12;
5 is a first lamp which is a first indicator whose one end is connected to the normally open contact of the relay 14; 16 is a second lamp which is a first indicator whose one end is connected to the normally closed contact of the relay 14; and 17 is a This is a third switch consisting of two interlocking switches, and one end of each interlocking switch is connected to the first and second connection terminals 8' and 8' of the second connection section 8, respectively.
8'', the other end of one interlocking switch is connected to the other ends of the first and second lamps 15 and 16, respectively, and the other end of the other interlocking switch is connected to the common terminal of the relay 14. be done.

Reference numeral 18 denotes a fourth switch consisting of two interlocking switches each having one end connected to one end of the secondary winding of the slider 10 and a movable terminal, and 19 the other end of each interlocking switch 18 of the fourth switch 18 having both input ends. diode bridge rectifier circuit connected to, 2
0 is a second DC voltmeter whose both ends are connected to the positive and negative output terminals of the rectifier circuit 19; 21 is a fifth switch whose one end is connected to the positive output terminal of the rectifier circuit 19;
2 is a DC relay to be tested in which both ends of the relay coil are connected to the other end of the fifth switch 21 and the negative output terminal of the rectifier circuit 19; 23 is a first display in which one end is connected to the normally open contact of the relay 22; The third lamp 24 is a first indicator whose one end is connected to the normally closed contact of the relay 22. The sixth switch 25 is a sixth switch consisting of two interlocking switches. One end is connected to the first and second connection terminals 8' and 8'' of the second connection part 8, respectively, and the other end of one interlocking switch is connected to the other end of the third and fourth lamps 23 and 24, respectively. The other end of the other interlocking switch is connected to the common terminal of the relay 22, and the circuit surrounded by the broken line in FIG. 1 determines whether the relays 14 and 22 operate normally. The first auxiliary testing section 26 tests
is configured.

27 is a seventh switch consisting of two interlocking switches each having one end connected to the first and second connection terminals 4' and 4'' of the first connection part 4; 28 and 29 each having one end connected to the first and second connection terminals 4' and 4'' of the seventh switch 27 First and second fuses are connected to the other ends of each interlocking switch; 30 is a first transformer in which both ends of the primary winding are connected to the other ends of the first and second fuses 28 and 29; 31 is one end of each an eighth switch consisting of two interlocking switches connected to both ends of the secondary winding of the first transformer 30;
32 is a third AC voltmeter whose both ends are connected to the other ends of each interlocking switch of the eighth switch 31; 33 is a changeover switch; first and second changeover contacts 34, 3
4' are connected to the third and fourth switching contacts 35 and 35', respectively, and the first and second switching contacts 34 and 3 are connected to the first and second common contacts 36 and 36', respectively.
The first and second switching pieces 37, 37' on the 4' side are interlocked, and the second and first common contacts 36, 36'
third and fourth switching contacts 35, respectively connected to
The third and fourth switching pieces 38 and 38' on the 35' side are interlocked. 39 is a current limiting resistor whose one end is connected to the first common contact 36 of the changeover switch 33; 40 is a current limiting resistor whose anode and cathode are respectively connected to the other end of the first resistor 39 and the second common contact 36' of the changeover switch 33; rectifier diodes that together with the current resistance 39 constitute the test short circuit 41; 42 and 43 are the first and second current transformers respectively provided between the secondary winding of the first transformer 30 and the eighth switch 31; 44 is a ninth switch consisting of three interlocking switches each having one end connected to one end of the secondary coil of the first current transformer 42, an intermediate tap, and the other end, and 45 each having one end connected to the second current transformer 43 This is the 10th switch consisting of two interlocking switches connected to both ends of the secondary coil of the first transformer 30, the changeover switch 33,
Short circuit 41, first and second current transformers 42, 43, eighth
~10th switches 31, 44, 45 and a third voltmeter 32 constitute a signal generating section 46 that generates an operating signal for testing, and the first and second switching pieces 37, 37' or 3rd, 4th
By connecting the switching pieces 38, 38' to the first to fourth switching contacts 34, 34', 35, 35', respectively, the direction of the current flowing through the primary side of each current transformer 42, 43 changes, and the direction of the current flowing through the primary side of each current transformer 42, 43 is changed. A test activation signal, which is a current signal corresponding to the current, is output from the secondary coil of each current transformer 42, 43.

47 and 48 each have one end connected to the seventh switch 27
The third and fourth switches are connected to the other end of each interlocking switch.
Fuse, 49 has 3rd and 4th fuses on both ends 4
7, a pilot lamp connected to the other end of 48;
50 has a primary winding 51 and first and second secondary windings 51', 51'', and both ends of the primary winding 51 have a third winding,
The second fuse connected to the other end of the fourth fuse 47, 48
transformers 52 to 54 are first to third terminals connected to one end of each interlocking switch of the ninth switch 44;
55 and 56 have one end connected to the first and third terminals 5, respectively.
2, 54 connected to the first and second reactors, 5
7 and 58 are first and second backflow prevention diodes whose anodes are connected to the other ends of the first and second reactors 55 and 56, respectively, and 59 and 60 whose one ends are connected to the first and second diodes 57 and 58, respectively. The first and second capacitors 61 and 62, which are connected to the cathode and the other ends are connected to each other, each have one end connected to the first and second capacitors.
The first and second resistors 63 are connected to the cathodes of the diodes 57 and 58, and the first and second resistors 63 are connected to each other at both ends.
The movable terminal connected to the other end of 1, 62 is the second terminal 5.
3, variable resistors 64 and 65 have one end connected to the cathodes of the first and second diodes 57 and 58, and 66 has both ends connected to the cathode of the second diode 58 and the third resistance 64
A third capacitor 67 connected to the other end is a fourth capacitor 68 whose both ends are connected to the cathode of the first diode 57 and the other end of the fourth resistor 65.
Reference numerals 69 denote first and second NPN transistors whose bases and emitters are connected in parallel to third and fourth capacitors 66 and 67, respectively.

At this time, reactors 55, 56, each resistor 61
~65, each capacitor 59, 60, 66, 67,
The transistor 6 is connected by the diodes 57 and 58.
8 and 69 constitute a control section that outputs a control signal.

Reference numerals 70 and 71 indicate first and second current increasing relays and current decreasing relays whose one ends are connected to the collectors of the first and second transistors 68 and 69, respectively.
The anode and cathode of the relay coils 72 and 73 are connected to one end of the first and second secondary windings 51' and 51'' of the second transformer 50 and the other ends of the first and second relay coils 70 and 71, respectively. The third and fourth rectifying diodes 74 have both ends connected to the second and third rectifying diodes.
A fifth capacitor 75 is connected to the cathodes of the diodes 58 and 72, a sixth capacitor 75 is connected to the cathodes of the first and fourth diodes 57 and 73, and 76 and 77 are the first and second relay coils 7.
0 and 71 for relay protection; 78 is an eleventh switch for manual testing whose both ends are connected to the cathode of the second diode 58 and one end of the first relay coil 70;
9 is a twelfth switch for manual testing whose both ends are connected to the cathode of the first diode 57 and one end of the second relay coil 71, and 80 and 81 are second indicators provided in parallel to each relay coil 70 and 71, respectively. are the fourth and fifth voltmeters for DC, and the second
The circuits surrounded by one-dot chain lines in the figure are formed on separate substrates, and the second transformer 50
The welding current adjustment section 82 is constituted by the circuit surrounded by the broken line in the same figure, and when the welding operator short-circuits the actual short circuit to the base metal, the first,
The second transistors 68, 69 are turned on, the first and second relay coils 70, 71 are excited, each relay is operated, the current adjustment motor (not shown) is rotated, and the welding current increases and decreases. The signal generator 46, the 11th and 12th switches 78 and 79, and the 4th and 5th voltmeters 80 and 8
1 constitutes a test device 83 that tests whether the adjustment section 82 operates normally.

84 is a 13th switch consisting of two interlocking switches whose one end is connected to the first and second connection terminals 4' and 4'' of the first connection part 4, and 85 is a 13th switch whose both ends of the primary winding are connected. The third transformers 86 and 87 are connected to the other end of each interlocking switch 84, and the fifth and sixth fuses 86 and 87 each have one end connected to one end of the secondary winding of the third transformer 85 and an intermediate tap.
8 is a seventh rectifying diode whose anode is connected to the other end of the sixth fuse 87; 89 is a fifth current-limiting diode whose one end is connected to the cathode of the seventh diode 88;
90 is an eighth diode whose anode is connected to the other end of the fifth resistor 89; 91 is a fourteenth switch whose one end is connected to the cathode of the eighth diode 90; both ends of 92 are the other ends of the fourteenth switch 91. and a seventh capacitor connected to the other end of the secondary winding of the third transformer 85, which includes the third transformer 85, seventh and eighth diodes 88, 90, and a fifth resistor 89.
A bias signal supply section 93 is constituted by the 14 switch 91 and the seventh capacitor 92.

94 is a ninth current diode whose anode is connected to the other end of the fifth fuse 86; 95 is a seventh lamp which is a third indicator whose one end is connected to the cathode of the ninth diode 94; 96 is a collector and a base. , the emitters are respectively at the other end of the seventh lamp 95,
This is a test transistor connected to the other end of the 14th switch 91 and the other end of the 7th capacitor 92, and the 3rd
The circuit shown in the figure constitutes a second auxiliary test section 97 that tests whether the transistor under test 96 operates normally.

Next, the operation of the embodiment will be explained.

First, the operation of the first auxiliary test section 26 will be explained. When testing each of the current increasing relay and current decreasing relay shown in FIG. 2 and other relays of the control device, the relay coil of each relay is It connects to the connection position of the DC relay 22 of the first auxiliary test section 26 and adjusts the secondary voltage of the slide switch 10 to a predetermined value, and also connects the fourth and sixth switches 18,
Turn on 25. At this time, if the fourth lamp 24 lights up, it means that the normally closed contacts of the connected relays are normally connected.

Next, when the fifth switch 21 is turned on from the above state, if the fourth lamp 24 goes out and the third lamp 23 lights up, the relay coil is energized and normally switched to the normally open contact side. This shows that the relay is operating normally. Note that the relays to be tested are not limited to those mentioned above.

Furthermore, to explain the operation of the second auxiliary test section 97, the first and second transistors 6 in FIG.
When testing transistors 8, 69 and other transistors, connect each transistor to the connection position of the transistor under test 96 of the second auxiliary test section 97, turn on the 14th switch 91, and test the connected transistors 68, 69.
A predetermined bias current is supplied to the base of 69.
At this time, if the seventh lamp 95 lights up, it can be seen that each of the transistors operates normally.

Therefore, the welding current adjustment section 82 is connected as shown in FIG.
By turning on the ninth switch 44 and turning off the ninth switch 44, a predetermined test operation signal is output from the secondary coil of the first current transformer 42, and the first transistor 6
8 or the second transistor 69 is turned on. At this time, by turning on the first transistor 68 or the second transistor 69, the first relay coil 70 or the second relay coil 71 is excited, and the fourth voltmeter 80 or the fifth voltmeter 8 of the second test equipment section 83 is excited.
1 indicates 12V, it can be seen that the welding current adjustment section 82 operates normally. Note that even if the 11th and 12th switches 78 and 79 are turned on, each relay coil 8
It can be tested by applying current to 0.81.

By the way, when the welding current adjustment section 82 does not operate normally, in order to find the abnormality, the relay and transistor are connected to the first and second positions as described above.
Tested by auxiliary testing departments 26 and 97, respectively.
It is sufficient to check whether the relay or transistor itself is good or not, and if the abnormality is in a resistor other than the relay or transistor, the conduction state can be checked using a tester, and even non-experts can easily perform the test.

Therefore, according to the embodiment, the test device,
The test sections 26, 83, and 97 can test whether or not the welding current adjustment section 82 of the AC arc welding machine operates normally under the same conditions as those in which it is actually used. Since the voltmeters 80 and 81 can indicate that the welding current adjustment unit 82 is normal when can.

Note that this invention can be implemented in the same way even if each circuit surrounded by a dashed-dotted line in FIG. 2 is formed on one substrate.

Further, the welding current adjusting section 82 in FIG. 2 includes a plurality of diodes D, resistors R,
Capacitor C, NPN transistor T, relay
Even if the welding current adjustment section 98 is configured by RY, the test can be conducted in the same manner as described above using a test device consisting of the signal generation section 46 and the voltmeter 99 as a display.

[Brief explanation of the drawing]

The drawings show an embodiment of the test device for the welding current adjustment section of an AC arc welding machine of this invention, and FIGS. 1 to 3 show one embodiment, and FIG. 1 is a wiring diagram of the first auxiliary test section; FIG. 2 is a wiring diagram of a test device and a welding current adjustment section, FIG. 3 is a wiring diagram of a second auxiliary testing section, and FIG. 4 is a wiring diagram of a part of another embodiment. 46... Signal generation section, 80, 81, 99... Voltmeter, 82, 98... Welding current adjustment section, 83...
Test equipment.

Claims (1)

[Claims for Utility Model Registration] A short circuit consisting of a half-wave rectifier diode connected to one output terminal of an AC arc welding machine so as to be freely connected to and separated from the base material, and a short circuit consisting of a half-wave rectifier diode connected to the other output terminal of the welding machine. a signal detector that detects the direction of a signal current flowing in the welding cable due to a short circuit of the short circuit element and outputs a direction detection signal; Welding of an AC arc welding machine equipped with a control unit that outputs a control signal, a transistor that is turned on by each of the two control signals, and a relay that is excited and activated when both of the transistors are turned on and drives a current adjustment motor. In the welding current adjustment unit test equipment of an AC arc welding machine that tests the operation of the current adjustment unit, a test short circuit consisting of a half-wave rectifier diode connected to an AC power supply, and a test short circuit consisting of a half-wave rectifier diode connected to an AC power source, and a signal generating section configured by a current transformer that outputs a corresponding operating signal to the control section; and an indicator connected to an output terminal of the adjusting section and activated by normal operation of the adjusting section upon input of the operating signal. A testing device for the welding current adjustment section of an AC arc welding machine.