CN102896402A - AC welder - Google Patents
AC welder Download PDFInfo
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- CN102896402A CN102896402A CN2011102152753A CN201110215275A CN102896402A CN 102896402 A CN102896402 A CN 102896402A CN 2011102152753 A CN2011102152753 A CN 2011102152753A CN 201110215275 A CN201110215275 A CN 201110215275A CN 102896402 A CN102896402 A CN 102896402A
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- 238000003466 welding Methods 0.000 claims abstract description 118
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 108091064702 1 family Proteins 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses an AC welder which comprises a switch, a first fuse, a second fuse, a welder transformer, a transformer, an AC contactor, a time relay, a sensitive relay and a resistor. By the aid of an additional no-load automatic stop protection circuit, the AC welder can operate normally when a welding electrode contacts with a workpiece to power the AC contactor, and can stop operating when the welding electrode does not contact with the workpiece to fail the AC contactor. Therefore, no-load automatic stop of the AC welder is achieved, electric shock can be prevented, no-load loss can also be reduced greatly, and safety and energy conservation of the AC welder are improved.
Description
Technical Field
The invention relates to the technology of alternating current welding machines, in particular to an alternating current welding machine with a no-load automatic stop protection circuit.
Background
As is well known, an AC welder is a welder for converting AC electric energy into welding energy, the circuit control principle of which is shown in FIG. 1, and comprises a switch 1, fuses 2 and 3, a welder transformer 4, an electric welding rod 5 and a workpiece 6, wherein the switch 1 is connected with a power supply side terminal 4 of the welder transformer 4 through the fuses 2 and 3 respectively1、42 Output terminal 4 of transformer 4 of connecting and welding machine3 A connecting workpiece 6 connected to and grounded together with the output terminal 44Connected with the welding electrode 5. Output terminal 4 after switch 1 is closed3、44With welding voltage therebetween, thereby electrically operating the welding electrode 5. The alternating current welding machine is widely applied to various fields due to the advantages of small size, simple operation, convenient use, high speed, firm welding line after welding and the like.
Although such an ac welder has the above-mentioned advantages, it still has the following disadvantages:
1. the working frequency and the working voltage of the alternating current welding machine are respectively 50Hz and 380V, and the alternating current of 40Hz-60Hz is extremely harmful to human if passing through the brain or the heart of the human body. The welding rod is frequently replaced in the welding operation process, and at the moment, if the welding rod is electrified, electric shock accidents are easily caused due to irregular operation or improper protection. In addition, if the ac welder is operated continuously, the internal circuit and various circuit components thereof are prone to malfunction or get wet, which may cause the ac welder housing to become live, and thus, may cause electric shock.
2. The manual welding work is generally intermittent welding, and when the alternating current welding machine is in idle load, no-load current still passes through a coil, so that great no-load loss is caused. For example, assuming that the idle load loss of an ac welding machine is 400W, the usage rate of the ac welding machine in welding operation is 50%, the ac welding machine works for 8 hours every day, and works for 25 days in 1 month, the idle load loss in 1 year can be up to 480KW, which is equivalent to 5-6 years of power consumption of 1 family, and the power loss is quite serious. In addition, if the power supply is cut off in the intermittent welding process to achieve the purpose of saving power, the power supply is switched on and off too frequently, so that the working efficiency is low, and potential safety hazards are brought to welders.
Disclosure of Invention
The invention provides an alternating current welding machine which is used for realizing automatic power-off when the alternating current welding machine is in no-load.
The invention provides an alternating current welding machine, which comprises a switch, a first fuse, a second fuse and a welding machine transformer, and further comprises a transformer, an alternating current contactor, a time relay, a sensitive relay and a resistor;
wherein,
a first primary terminal and a second primary terminal of the transformer are respectively connected with the lower ends of the first fuse and the second fuse, a first secondary terminal of the transformer is connected with a second output terminal of the welding machine transformer through the resistor and a normally closed contact of the alternating current contactor, a second secondary terminal of the transformer is connected with an iron core of the transformer and is grounded, and a first output terminal of the welding machine transformer is grounded;
a normally open contact of the alternating current contactor is connected with a normally closed contact of the sensitive relay in parallel and is sequentially connected with the normally closed contact of the time relay and a coil of the alternating current contactor in series, and two ends of a branch obtained by series connection are respectively connected with a first primary wiring end and a second primary wiring end of the transformer; one ends of a first main contact and a second main contact of the alternating current contactor are respectively connected with the lower ends of the first fuse and the second fuse, and the other ends of the first main contact and the second main contact are respectively connected with a first power supply side binding post and a second power supply side binding post of the welding machine transformer;
one end of a coil of the time relay is connected with a second output terminal wiring terminal of the welding machine transformer and a normally closed contact of the alternating current contactor, and the other end of the coil of the time relay is grounded;
and one end of a coil of the sensitive relay is connected with the normally closed contact of the alternating current contactor and the connection point of the first secondary terminal of the transformer, and the other end of the coil is grounded.
According to the technical scheme, the no-load automatic stop protection circuit is additionally arranged on the basis of the original circuit, so that the alternating current electric welding machine does not work due to the fact that the alternating current contactor does not have power when the welding electrode is not in contact with a workpiece, and the alternating current electric welding machine normally works due to the fact that the alternating current contactor is powered again when the welding electrode is in contact with the workpiece, therefore, the no-load automatic stop function of the alternating current electric welding machine is achieved, electric shock accidents can be prevented, no-load loss can be greatly reduced, and safety and energy conservation in the working process of the alternating current electric welding machine are improved.
Drawings
Fig. 1 is a circuit control schematic diagram of an ac welding machine in the prior art.
Fig. 2 is a circuit control schematic diagram of the ac welding machine with no-load automatic stop protection circuit according to the present invention.
The reference numbers are as follows:
| a-original circuit; | b-no-load automatic stop protection circuit; |
| 1-a switch; | 2. 3-a fuse; |
| 4-welding machine transformer; | 5-welding electrode; |
| 6-a workpiece; | 7-a transformer; |
| 8-an alternating current contactor; | 9-time relay; |
| 10-sensitive relay; | 11-resistance; |
| 41、42-welder transformer power side terminal; | 43、44-a welder transformer output terminal stud; |
| 71、72-a transformer primary terminal; | 73、74-a transformer secondary terminal; |
| 81、82-an ac contactor main contact; | 83-an ac contactor normally open contact; |
| 84-an ac contactor normally closed contact; | 91-a time relay normally closed contact; |
| 101-sensitive relay normally closed contacts. |
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It should be noted that in the drawings or the specification, similar or identical elements are provided with the same reference signs.
Referring first to fig. 2, fig. 2 is a schematic circuit control diagram of an ac welding machine with an idle-load automatic stop protection circuit according to the present invention, and in fig. 2, the ac welding machine includes an original circuit a and an idle-load automatic stop protection circuit B. As can be seen from fig. 2, the original circuit a includes a switch 1, fuses 2 and 3 and a welder transformer 4, and the no-load automatic stop protection circuit B includes a transformer 7, an ac contactor 8, a time relay 9, a sensitive relay 10 and a resistor 11. In addition, fig. 2 also includes a welding electrode 5 and a workpiece 6 to be welded.
Specifically, the switch 1 passes through the fuses 2, 3 and the main contact 8 of the ac contactor 8, respectively1、82Power supply side connection with welder transformer 4Column 41、42 Output terminal 4 of transformer 4 of connecting and welding machine3A terminal 4 at the output end of the transformer 4 of the welding machine for connecting and grounding the workpiece 64Connected with the welding electrode 5.
The AC contactor 8 has a coil and a main contact 81And 82Normally open contact 83And a normally closed contact 84Said normally open contact 83Normally closed contact 10 with sensitive relay 101In parallel with the normally closed contact 9 of the time relay 91And the coil of the alternating current contactor 8 are sequentially connected in series, and two ends of a branch obtained by the series connection are respectively connected with the primary wiring terminal 7 of the transformer 71、72Connecting, main contact 81、82One end of the transformer is respectively connected with the lower ends of the fuses 2 and 3, and the other end of the transformer is respectively connected with a power supply wiring terminal 4 of a transformer 4 of the welding machine1、42And (4) connecting.
The time relay 9 has a coil and a normally closed contact 91One end of the coil of the time relay 9 is connected with an output terminal 4 of the welding machine transformer 44And a normally closed contact 8 of an AC contactor 84And the other end is grounded.
When the ac welder shown in fig. 2 is used, an ac voltage, usually 380V, is applied to the ac welder, and after the switch 1 is closed, the two situations of the sensitive relay 10 getting power first and the ac contactor 8 getting power first are generally included in the present embodiment, and then the circuit control principle of the ac welder with the no-load self-stop protection circuit in the present embodiment is described in detail in the two situations.
(1) Sensitive relay 10 first gets electricity
Specifically, when the switch 1 is closed, the sensitive relay 10 is powered first through the transformer 7, and the normally closed contact 10 thereof1Open, so that the ac contactor 8 is in the open circuit and cannot get power, the main contact 8 of the ac contactor 81、82Cannot be closed, so that the power supply side terminal 4 of the transformer 4 of the welding machine1、42The two ends are not electrified, and the alternating current welding machine does not work. In addition, since the ac contactor 8 is not energized, its normally open contact 83Open, normally closed contact 84And (5) closing.
It should be noted here that, in order to ensure that the sensitive relay 10 can be powered by the transformer 7 after the switch 1 is closed, the induced voltage of the transformer 7 may be set to be not less than the pull-in voltage of the sensitive relay 10, for example, in the present embodiment, the induced voltage of the transformer 7 may be set to be 12V, and since the sensitive relay 10 shares the induced voltage of the transformer 7 with the resistor 11, the sensitive relay 10 with a rated voltage of 12V and a pull-in voltage of 6V may be selected. The reason why the resistance is provided here will be described later in detail.
As described above, although the switch 1 is turned on before the welder needs to perform the welding operation, the ac electric welder still has no power and does not work, thereby achieving the purpose of safety and energy saving.
When the welder needs to perform a welding operation, the welding electrode 5 is brought into contact with the workpiece 6, due to the normally closed contact 8 of the ac contactor 84Closed, thus normally closed contact 84 Output terminal 44The welding electrode 5 and the workpiece 6 form a loop, so that the sensitive relay 10 is short-circuited and is powered off, and the normally closed contact 10 of the sensitive relay1Closed, in which the ac contactor 8 is in the closed state by means of a time relay 9Normally closed contact 91And the normally closed contact 101Is energized and then the main contact 8 of the AC contactor 81、82Closed to make the welding machine transformer 4 powered and the output terminal 43、44And working voltage is generated between the two, so that the alternating current welding machine works normally. In addition, since the AC contactor 8 is energized, its normally open contact 83Closed, normally closed contact 84Open to ensure that the sensitive relay 10 does not short out again during the welding operation.
In addition, since the workpiece 6 usually has rust, so that when the welding electrode 5 contacts the workpiece 6, there may be no absolute short circuit to the sensitive relay 10, as shown in fig. 2, by providing the resistor 11, the voltage across the coil of the sensitive relay 10 can be properly reduced, so as to strike arc and improve the working reliability of the ac welder. In the present embodiment, the resistance value of the resistor 11 may be set to 15 Ω.
It should also be mentioned here that the normally closed contact 9 of the time relay 9 is ensured1Closed so that the ac contactor 8 can pass through the normally closed contact 9 when the welding electrode 5 is in contact with the workpiece 61And a normally closed contact 101If energized, the induced voltage of the transformer 7 may be set to be less than the pull-in voltage of the time relay 9 so that the time relay 9 is not energized by the transformer 7, for example in this embodiment the induced voltage of the transformer 7 may be set to 12V, whereas considering that the welding voltage generated by the transformer 4 of the welding machine is typically about 65V-80V and still typically about 35V when the welding electrode 5 is in contact with the workpiece 6, the time relay 9 with a pull-in voltage of 60V may be selected so that, on the one hand, the time relay 9 is not energized so that its normally closed contact 9 is closed during contact of the welding electrode 5 with the workpiece 61Open, on the other hand, to energize the time relay 9 when stopping the welding operation, the circuit control principle with respect to when stopping the welding operation will be described in detail below. Further, the withstand voltage of the time relay 9 may be more than 100V.
When the welder needs to stop the welding operation, the welding electrode 5 is separated from the workpiece 6, and the time is shortenedThe relay 9 passes through the output terminal 44When power is on, after actuation delay, the normally closed contact 9 of the time relay 91Open to cut off the circuit of the AC contactor 8 again, the AC contactor 8 loses power and the main contact 8 thereof1、82And (4) switching on to cut off the power of the transformer 4 of the welding machine, and stopping the work of the alternating current welding machine. In addition, the normally closed contact 8 of the ac contactor 84Closed, normally open contact 83Open to ensure against output terminal 43、44The two ends are not electrified to cause the power failure of the time relay 9, so that the normally closed contact 9 is enabled1And is closed again, and the ac contactor 8 is powered again. In the present embodiment, the pull-in delay time of the time relay 9 is generally 3s to 10 s.
When the welder again needs to perform the welding operation, the welding electrode 5 may be brought into contact with the workpiece 6 again, and the above process is repeated, which will not be described again.
(2) Ac contactor 8 getting electricity first
Specifically, when the switch 1 is closed, the AC contactor 8 passes through the normally closed contact 9 of the time relay 91And a normally closed contact 10 of the sensitive relay 101When the electricity is firstly obtained, the normally open contact 8 of the AC contactor 83Closed, normally closed contact 84Open, main contact 81、82When the welding machine transformer 4 is closed, the welding machine transformer 4 is electrified to generate welding voltage, the time relay 9 is electrified through the welding machine transformer 4, and after actuation delay, the normally closed contact 9 of the time relay 91Open to cut off the loop of the AC contactor 8 and then to make the AC welder power-off inoperative, the normally open contact 8 of the AC contactor 83Open, normally closed contact 84Closed, main contact 81、82And (4) opening. The sensitive relay 10 can be electrified through the transformer 7, so that the normally closed contact 10 of the sensitive relay is enabled to be normally closed1And (4) opening. In the present embodiment, the rated current of the ac contactor 8 may be 20A, and the rated voltage may be 380V.
When the welder needs to perform welding operation, the welding electrode 5 is contacted with the workpiece 6, and at the moment, the time relay 9 is powered off, so that the normally closed contact of the time relay is closed91Closed again, and, in addition, due to the normally closed contact 8 of the previous ac contactor 84Closed, thus normally closed contact 84 Output terminal 44The welding electrode 5 and the workpiece 6 form a loop, so that the sensitive relay 10 is short-circuited and loses power, and the normally closed contact 10 of the sensitive relay is closed1Closed, and then the ac contactor 8 passes through the normally closed contact 91And a normally closed contact 101Energized, its main contact 81、82And closing the transformer 4 of the welding machine to be electrified, so that the alternating current welding machine works normally. In addition, since the AC contactor 8 is energized, its normally open contact 83Closed, normally closed contact 84Open to ensure that the sensitive relay 10 does not short out again during the welding operation.
When the welder needs to stop the welding operation, the welding electrode 5 is separated from the workpiece 6, and the time relay 9 passes through the output terminal 44When power is on, after actuation delay, the normally closed contact 9 of the time relay 91Open to cut off the circuit of the AC contactor 8 again, the AC contactor 8 loses power and the main contact 8 thereof1、82And (4) switching on to cut off the power of the transformer 4 of the welding machine, and stopping the work of the alternating current welding machine. In addition, the normally closed contact 8 of the ac contactor 84Closed, normally open contact 83Open to ensure against output terminal 43、44The two ends are not electrified to cause the power failure of the time relay 9, so that the normally closed contact 9 is enabled1And is closed again, and the ac contactor 8 is powered again.
When the welder again needs to perform the welding operation, the welding electrode 5 may be brought into contact with the workpiece 6 again, and the above process is repeated, which will not be described again.
In this embodiment, the illustrated voltage value, current value or resistance value is not limited thereto, and may be floated up and down based on this, which is determined according to the actual situation and is not described herein again.
In summary, no matter the sensitive relay 10 is powered first or the ac contactor 8 is powered first, the no-load self of the ac welding machine of the present inventionThe stop protection circuit can ensure that the alternating current welding machine does not work due to the fact that the alternating current contactor 8 does not have electricity when welding operation is not performed (namely the welding electrode 5 is not in contact with the workpiece 6), the alternating current welding machine can work normally due to the fact that the alternating current contactor 8 is powered on when welding operation is performed (namely the welding electrode 5 is in contact with the workpiece 6), and the alternating current welding machine can stop working due to the fact that the alternating current contactor 8 is powered off when the welding electrode 5 is separated from the workpiece 6 again, so that the no-load automatic stop function of the alternating current welding machine is achieved. In addition, the AC welder of the present invention is operated only at the secondary terminal 7 of the transformer 7 when not in operation3、74The voltage of the transformer 7 is only 12V, so that compared with the electric energy consumed by the existing alternating current welding machine when the alternating current welding machine is in no load, the electricity-saving efficiency of the alternating current welding machine with the no-load automatic stop protection circuit is greatly improved, and the purposes of safety and energy saving are achieved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. An alternating current welding machine comprises a switch, a first fuse, a second fuse and a welding machine transformer, and is characterized by further comprising a transformer, an alternating current contactor, a time relay, a sensitive relay and a resistor; wherein,
a first primary terminal and a second primary terminal of the transformer are respectively connected with the lower ends of the first fuse and the second fuse, a first secondary terminal of the transformer is connected with a second output terminal of the welding machine transformer through the resistor and a normally closed contact of the alternating current contactor, a second secondary terminal of the transformer is connected with an iron core of the transformer and is grounded, and a first output terminal of the welding machine transformer is grounded;
a normally open contact of the alternating current contactor is connected with a normally closed contact of the sensitive relay in parallel and is sequentially connected with the normally closed contact of the time relay and a coil of the alternating current contactor in series, and two ends of a branch obtained by series connection are respectively connected with a first primary wiring end and a second primary wiring end of the transformer; one ends of a first main contact and a second main contact of the alternating current contactor are respectively connected with the lower ends of the first fuse and the second fuse, and the other ends of the first main contact and the second main contact are respectively connected with a first power supply side binding post and a second power supply side binding post of the welding machine transformer;
one end of a coil of the time relay is connected with a second output terminal wiring terminal of the welding machine transformer and a normally closed contact of the alternating current contactor, and the other end of the coil of the time relay is grounded;
and one end of a coil of the sensitive relay is connected with the normally closed contact of the alternating current contactor and the connection point of the first secondary terminal of the transformer, and the other end of the coil is grounded.
2. The alternating current electric welding machine of claim 1 wherein the second output terminal of the welding machine transformer is connected to the welding electrode.
3. An alternating current electric welding machine as claimed in claim 1, characterized in that the induced voltage of said transformer is 12V.
4. The ac electric welding machine according to claim 1, wherein the ac contactor has a rated current of 20A and a rated voltage of 380V.
5. An AC electric welding machine as set forth in claim 1 wherein said pull-in voltage of said time relay is 60V.
6. An alternating current electric welding machine as claimed in claim 1, characterized in that the sensitive relay has a rated voltage of 12V and a pull-in voltage of 6V.
7. The alternating current electric welding machine according to claim 1, wherein the resistance value of the resistor is 15 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110215275.3A CN102896402B (en) | 2011-07-29 | 2011-07-29 | AC welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110215275.3A CN102896402B (en) | 2011-07-29 | 2011-07-29 | AC welding machine |
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| Publication Number | Publication Date |
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| CN102896402A true CN102896402A (en) | 2013-01-30 |
| CN102896402B CN102896402B (en) | 2014-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110215275.3A Active CN102896402B (en) | 2011-07-29 | 2011-07-29 | AC welding machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104416294A (en) * | 2013-09-05 | 2015-03-18 | 信义汽车玻璃(深圳)有限公司 | Welding machine |
| US11305369B2 (en) | 2018-08-29 | 2022-04-19 | Lincoln Global, Inc. | Engine-based welder with auto-start feature |
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|---|---|---|---|---|
| SU1169793A1 (en) * | 1983-09-15 | 1985-07-30 | Mark M Moroshek | Device for automatic control of welding circuit in arc welding |
| CN88100985A (en) * | 1988-02-16 | 1988-08-24 | 江西省崇仁节能电器厂 | AC arc welding machine no-load power saving device |
| CN201300275Y (en) * | 2008-08-12 | 2009-09-02 | 中建三局第三建设工程有限责任公司 | An idle-load automatic stop power saving device for ac welding machine |
| CN201471062U (en) * | 2009-04-01 | 2010-05-19 | 杨津 | Full-automatic no-load energy-saving welding machine |
| CN201735933U (en) * | 2010-06-12 | 2011-02-09 | 禹州市电力工业公司 | Delay controller circuit of electric welder |
| CN202240074U (en) * | 2011-07-29 | 2012-05-30 | 淮南矿业(集团)有限责任公司 | AC electric welder |
-
2011
- 2011-07-29 CN CN201110215275.3A patent/CN102896402B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1169793A1 (en) * | 1983-09-15 | 1985-07-30 | Mark M Moroshek | Device for automatic control of welding circuit in arc welding |
| CN88100985A (en) * | 1988-02-16 | 1988-08-24 | 江西省崇仁节能电器厂 | AC arc welding machine no-load power saving device |
| CN201300275Y (en) * | 2008-08-12 | 2009-09-02 | 中建三局第三建设工程有限责任公司 | An idle-load automatic stop power saving device for ac welding machine |
| CN201471062U (en) * | 2009-04-01 | 2010-05-19 | 杨津 | Full-automatic no-load energy-saving welding machine |
| CN201735933U (en) * | 2010-06-12 | 2011-02-09 | 禹州市电力工业公司 | Delay controller circuit of electric welder |
| CN202240074U (en) * | 2011-07-29 | 2012-05-30 | 淮南矿业(集团)有限责任公司 | AC electric welder |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104416294A (en) * | 2013-09-05 | 2015-03-18 | 信义汽车玻璃(深圳)有限公司 | Welding machine |
| US11305369B2 (en) | 2018-08-29 | 2022-04-19 | Lincoln Global, Inc. | Engine-based welder with auto-start feature |
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| Publication number | Publication date |
|---|---|
| CN102896402B (en) | 2014-09-03 |
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