CN202886540U - Middle-frequency band insulation detector of inverter welding machine - Google Patents
Middle-frequency band insulation detector of inverter welding machine Download PDFInfo
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- CN202886540U CN202886540U CN 201220592601 CN201220592601U CN202886540U CN 202886540 U CN202886540 U CN 202886540U CN 201220592601 CN201220592601 CN 201220592601 CN 201220592601 U CN201220592601 U CN 201220592601U CN 202886540 U CN202886540 U CN 202886540U
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Abstract
The utility model relates to a middle-frequency band insulation detector of an inverter welding machine, and belongs to the technical field of electronics. The detector comprises an intermediate relay, a delay relay, a rectifier transformer circuit, and an air switch with earth leakage protection, wherein the input end of the air switch is connected with an alternating current power supply; the output end is connected with the input end of an inverter control cabinet on the welding machine; a normally open contact of the intermediate relay is connected with the input end and the output end of the inverter control cabinet of the inverter welding machine; the input end of the rectifier transformer circuit is connected with the output end of the air switch; two ends of a delay relay coil are respectively connected with the positive electrode output end and the negative electrode output end of the rectifier transformer circuit; the normally closed contact of the delay relay is connected with the coil of the intermediate relay in series to form a first branch circuit; and the first branch circuit is connected with the coil of the delay relay in parallel. The device can detect the middle-frequency band insulation condition of the welding machine when the welding machine is electrified while an operator does not contact the welding machine, and effectively reduces the false alarm rate.
Description
Technical field
The utility model relates to a kind of insulation detection device, and especially a kind of inverter type welder Mid Frequency insulation detection device belongs to electronic technology field.
Background technology
At present, it is a knotty problem that inversion electric resistance welder Mid Frequency insulation both at home and abroad detects, and is with earth leakage protective air switch can only protect welding machine 50/60Hz frequency range parts, to the above Mid Frequency of 400Hz, can not effectively protect.Particularly the IT soldering turret in the inverter type welder is with earth leakage protective air switch can not protect the welding machine Mid Frequency, because operating personnel often touch Mid Frequency cable and transformer, so the earth leakage protection of butt welding machine Mid Frequency is very important.
Understand according to the applicant; the earth leakage protective way of existing butt welding machine Mid Frequency is to pass zero sequence current mutual inductor (ZCT) with two cables that Mid Frequency connects transformer; with the zero-sequence current size; judge Mid Frequency parts insulation situation; when insulation drops to certain value; leakage current reaches alarming value, sends alerting signal.But existing ZCT produces the current value curve of reporting to the police at each frequency band, and is relatively poor with each frequency range human heart palace value curve (each frequency range people physical efficiency is born electric current) consistance of quivering, and can produce wrong report.
As shown in Figure 1, top curve is the current value that different frequency that International Power association demarcates jeopardizes human body, namely causes the harmful heart palace curve that quivers, and wherein jeopardizes the body current value during 50Hz and should be no more than 30mA; Jeopardize the body current value during 1000Hz and should be no more than 420mA.
Curve below among Fig. 1 is the alarm current value curve of normally used ZCT when different frequency, not only the position is lower, the current value of reporting to the police is less than normal, and curve shape and typical curve differ greatly, cause the harmful heart palace alarm current value of curve values much larger than the ZCT warning curve of present use of quivering at Mid Frequency, cause alerting signal inaccurate, more can not be used for sky and open tripping operation.Therefore with zero-sequence current protection, the threshold value of warning is too low, may affect because of the frequent warning of ZCT the normal operation of welding machine.
In addition, it is that welding machine works when production line is worked that traditional ZCT protection is reported to the police, for the hand-held welding machine, because in use equipment and people's close contact also have certain potential threat to human-body safety.
The utility model content
The technical matters that the utility model solves is: proposes a kind of inverter type welder Mid Frequency insulation detection device of effectively false alert reduction, this device can be subjected to electricity and the operating personnel's Mid Frequency of detection welding machine situation that insulate during contact welder not at welding machine.
In order to solve the problems of the technologies described above, the technical scheme that the utility model proposes is: a kind of inverter type welder Mid Frequency insulation detection device comprises auxiliary reclay, timing relay, transformer rectifier circuit and is with earth leakage protective air switch; The input end of described air switch is connected with AC power, and the input end of the inversion control case on its output terminal and the welding machine is connected, and the normally opened contact of described auxiliary reclay is connected with output terminal with the input end of the inversion control case of described inverter type welder; The input end of described transformer rectifier circuit is connected with the output terminal of air switch, the two ends of described timing relay coil are connected with cathode output end with described transformer rectifier circuit cathode output end respectively, the normally closed contact of described timing relay and the series connection of the coil of auxiliary reclay form the first branch road, the coils from parallel connection of coils of described the first branch road and timing relay; The delay time of described timing relay is less than the capacitor charging time in the described inversion control case.
Like this, utilize the capacitor charging time in the described inversion control case, butt welding machine is in the detection of insulating of power frequency section, and leakage current surpasses when human body produced the threshold value of harm to close by air and automatically cuts off welding machine electric power.
To improvement of the technical scheme be: also comprise double throw switch; The coil of described timing relay is connected with the auxiliary normally closed contact of contactor in being arranged on the inversion control case and is formed the second branch road; Anodal node behind described the second branch road and the first branch circuit parallel connection and negative pole node are connected respectively cathode output end and the cathode output end of described transformer rectifier circuit, and the first switch series of described double throw switch is connected between described anodal node and the described cathode output end or between described negative pole node and the described cathode output end; The coil that is used for the master control borad power supply of control contactor coil and contactor in the second switch of described double throw switch, the normally closed contact of auxiliary reclay, the inversion control case is one another in series and forms the loop.Described master control borad is existing master control borad in the inverter type welder.
Only have when second switch connection and auxiliary reclay disconnection, the normally closed contact of auxiliary reclay is in closure state, the coil conducting of the positive pole of described master control borad and contactor and make described contactor work, at this moment, the just adhesive of the main contacts of described contactor, welding machine enters normal operating conditions, and auxiliary normally closed contact disconnects simultaneously.Like this, can prevent power frequency and the mutual interference of intermediate frequency circuit phase.
If needed also can be by the detection of insulating fast of flicking double throw switch when welding machine is worked, and the inversion control case still is in holding state, thus reduced testing cost.
To further improvement in the technical proposal be: the output terminal at the inversion control case is coupled with zero-sequence transformer.
Like this, the leakage current that records when zero-sequence transformer reaches the predetermined value alarm, at this moment just can be by the detection of further insulating of described double throw switch.
To further improving again of technique scheme be: the delay time of described timing relay is less than or equal to 3/50 of the capacitor charging time in the described inversion control case.The interference for fear of intermediate frequency power supply and power frequency supply like this.
The beneficial effects of the utility model are: the utility model utilizes the mistiming of the inversion control case of welding machine in the capacitor charging preparatory stage, butt welding machine is in the detection of insulating of power frequency section, be subjected to electricity and operating personnel do not detect the Mid Frequency insulation situation of welding machine during contact welder at welding machine, make inverter type welder Mid Frequency insulation detection device of the present utility model near the quiver safety requirements of curve of human heart palace, alerting signal is more accurate like this, thereby has reduced the frequency of wrong report; Inverter type welder Mid Frequency insulation detection device of the present utility model also can by the detection of insulating fast of flicking double throw switch, effectively reduce testing cost if needed when welding machine is worked; Inverter type welder Mid Frequency insulation detection device of the present utility model is simple in structure, reliable operation, and cost is low.
Description of drawings
Below in conjunction with accompanying drawing inverter type welder Mid Frequency insulation detection device of the present utility model is described further.
Fig. 1 is the graph of a relation of leakage current and frequency curve.
Fig. 2 is the circuit diagram that the utility model is implemented embodiment one.
Fig. 3 is the circuit diagram that the utility model is implemented embodiment two.
Embodiment
Embodiment one
The inverter type welder Mid Frequency insulation detection device of present embodiment as shown in Figure 2, comprises auxiliary reclay, timing relay, transformer rectifier circuit and is with earth leakage protective air switch ELB; The input end of air switch ELB and AC power (common network electricity) are connected, and the input end of the inversion control case on its output terminal and the welding machine is connected input end and the output terminal of the inversion control case of the normally opened contact ZJ1 connection inverter type welder of described auxiliary reclay; The input end of transformer rectifier circuit is connected with the output terminal of air switch ELB, the two ends of timing relay coil SJ are connected with cathode output end, the cathode output end of transformer rectifier circuit respectively, the normally closed contact SJ1(energising of timing relay is closed, time-delay disconnects) and coil ZJ series connection formation first branch road of auxiliary reclay, this first branch road is in parallel with the coil SJ of timing relay; Wherein the delay time of timing relay is less than the capacitor charging time in the inversion control case.The delay time of timing relay is about 0.3 second in the present embodiment, and the capacitor charging setup time in the inversion control case is about 5 seconds.
The inverter type welder Mid Frequency insulation detection device of present embodiment is when work, after earth leakage circuit-breaker ELB send electricity, auxiliary reclay work, utilize inverter type welder capacitor charging mistiming preparatory stage, detect rapidly the Mid Frequency insulation of inverter type welder with the 380V/50Hz power supply, reach 30mA such as electric leakage, earth leakage circuit-breaker ELB disconnects, and capacitor charging preparation process stops; As it is qualified to insulate; because when earth leakage circuit-breaker ELB send electricity; timing relay work; 0.3 timing relay disconnects after second; the coil ZJ1 of auxiliary reclay disconnects simultaneously, and auxiliary reclay quits work, and the capacitor charging after about 5 seconds in the inversion control case is ready to complete and conducting; the inversion control case enters duty, and welding machine is started working.
Embodiment two
Present embodiment is the improvement on embodiment one basis, and as shown in Figure 3, its difference is: also comprise double throw switch; The coil SJ of timing relay connects with the auxiliary normally closed contact MC31 of contactor in being arranged on the inversion control case and forms the second branch road; Anodal node behind the second branch road and the first branch circuit parallel connection and negative pole node are connected respectively cathode output end and the cathode output end of transformer rectifier circuit, and the first switch series of double throw switch is connected between the cathode output end of anodal node and transformer rectifier circuit or between the cathode output end of negative pole node and transformer rectifier circuit; The coil MC3 that is used for the master control borad power supply of control contactor coil and contactor in the second switch SW52 of double throw switch, the normally closed contact ZJ2 of auxiliary reclay, the inversion control case is one another in series and forms the loop.
In the present embodiment, only have when second switch connection and auxiliary reclay disconnection, the normally closed contact ZJ2 of auxiliary reclay is in closure state, the coil MC3 conducting of the positive pole of master control borad and contactor and make contactor work, at this moment, just adhesive of the main contacts MC32 of contactor, auxiliary normally closed contact MC31 disconnects simultaneously.Like this, can prevent power frequency and the mutual interference of intermediate frequency circuit phase.
The inverter type welder Mid Frequency insulation detection device of present embodiment is when work, after earth leakage circuit-breaker ELB send electricity, the first interrupteur SW 51 of double throw switch is in on-state, the auxiliary normally closed contact MC31 of contactor is in closure state simultaneously, the second branch road conducting, timing relay energising work, disconnect after the first branch road conducting time-delay in about 0.3 second, at this in 0.3, auxiliary reclay coil ZJ energising, normally opened contact ZJ1 adhesive, at this moment, utilize inverter type welder capacitor charging mistiming preparatory stage, insulation detects with 380V/50Hz rapidly to Mid Frequency, reaches 30mA such as electric leakage, and earth leakage circuit-breaker ELB disconnects; As it is qualified to insulate, 0.3 auxiliary reclay quits work after second, the normally opened contact ZJ1 of auxiliary reclay disconnects, and the normally closed contact ZJ2 of auxiliary reclay is closed, capacitor charging behind about 5S in the inversion control case is ready to complete and conducting, and the inversion control case enters duty.In order to guarantee safety, double throw switch need to be toggled it to second switch SW52 and be in conducting state, at this moment, auxiliary reclay normally closed contact ZJ2 board closure state, so coil MC3 conducting of the positive pole of master control borad and contactor, the coil MC3 work of contactor, the main contacts MC32 of contactor is closed, and welding machine enters normal operating conditions.Only have when middle relay to quit work, when the normally opened contact ZJ1 of auxiliary reclay disconnected, welding machine just entered normal operating conditions, can prevent from like this stirring continuously the phase mutual interference of power frequency that double throw switch may cause and intermediate frequency power supply.
Such as the detection of under the welding machine normal operation, insulating, then stir double throw switch, this moment double throw switch the first interrupteur SW 51 closures, and the second switch SW52 of double throw switch disconnects, the coil MC3 of the positive pole of master control borad and contactor disconnects, the coil MC3 of contactor quits work, and main contacts MC32 disconnects, and cuts off intermediate frequency power supply; The auxiliary normally closed contact MC31 of contactor is closed simultaneously, the disconnection of delaying time after the timing relay closure, and like this, insulation detects and automatically begins.Testing process when its testing process is initially sent electricity with earth leakage circuit-breaker ELB is consistent.After finishing, detection reverses double throw switch to second switch SW52 conducting, the coil MC3 of contactor work, and the main contacts MC32 of contactor is closed, and welding machine begins normal operation.
Like this, by the detection of insulating fast of flicking double throw switch, and the inversion control case still is in holding state when welding machine is worked, thereby has reduced testing cost.
Present embodiment can also be done following improvement: the output terminal at the inversion control case is coupled with zero-sequence transformer.Like this, the leakage current that records when zero-sequence transformer reaches the predetermined value alarm, at this moment just can stir the double throw switch detection of further insulating by above-mentioned.
Inverter type welder Mid Frequency insulation detection device of the present utility model is not limited to the described concrete technical scheme of above-described embodiment, and all employings are equal to the technical scheme of replacing formation and are the protection domain that the utility model requires.
Claims (4)
1. an inverter type welder Mid Frequency insulation detection device is characterized in that: comprise auxiliary reclay, timing relay, transformer rectifier circuit and be with earth leakage protective air switch; The input end of described air switch is connected with AC power, and the input end of the inversion control case on its output terminal and the welding machine is connected, and the normally opened contact of described auxiliary reclay is connected with output terminal with the input end of the inversion control case of described inverter type welder; The input end of described transformer rectifier circuit is connected with the output terminal of air switch, the two ends of described timing relay coil are connected with cathode output end with described transformer rectifier circuit cathode output end respectively, the normally closed contact of described timing relay and the series connection of the coil of auxiliary reclay form the first branch road, the coils from parallel connection of coils of described the first branch road and timing relay; The delay time of described timing relay is less than the capacitor charging time in the described inversion control case.
2. inverter type welder Mid Frequency insulation detection device according to claim 1 is characterized in that: also comprise double throw switch; The coil of described timing relay is connected with the auxiliary normally closed contact of contactor in being arranged on the inversion control case and is formed the second branch road; Anodal node behind described the second branch road and the first branch circuit parallel connection and negative pole node are connected respectively cathode output end and the cathode output end of described transformer rectifier circuit, and the first switch series of described double throw switch is connected between described anodal node and the described cathode output end or between described negative pole node and the described cathode output end; The coil that is used for the master control borad power supply of control contactor coil and contactor in the second switch of described double throw switch, the normally closed contact of auxiliary reclay, the inversion control case is one another in series and forms the loop.
3. inverter type welder Mid Frequency insulation detection device according to claim 2, it is characterized in that: the output terminal at the inversion control case is coupled with zero-sequence transformer.
4. according to claim 1,2 or 3 described inverter type welder Mid Frequency insulation detection devices, it is characterized in that: the delay time of described timing relay is less than or equal to 3/50 of the capacitor charging time in the described inversion control case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220592601 CN202886540U (en) | 2012-11-12 | 2012-11-12 | Middle-frequency band insulation detector of inverter welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220592601 CN202886540U (en) | 2012-11-12 | 2012-11-12 | Middle-frequency band insulation detector of inverter welding machine |
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| Publication Number | Publication Date |
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| CN202886540U true CN202886540U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220592601 Withdrawn - After Issue CN202886540U (en) | 2012-11-12 | 2012-11-12 | Middle-frequency band insulation detector of inverter welding machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928753A (en) * | 2012-11-12 | 2013-02-13 | 小原(南京)机电有限公司 | Inverter welding machine middle frequency insulation detection device |
| CN111843302A (en) * | 2020-07-08 | 2020-10-30 | 中建路桥集团有限公司 | Welding machine card inserting and electricity taking system and using method thereof |
-
2012
- 2012-11-12 CN CN 201220592601 patent/CN202886540U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102928753A (en) * | 2012-11-12 | 2013-02-13 | 小原(南京)机电有限公司 | Inverter welding machine middle frequency insulation detection device |
| CN111843302A (en) * | 2020-07-08 | 2020-10-30 | 中建路桥集团有限公司 | Welding machine card inserting and electricity taking system and using method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130417 Effective date of abandoning: 20141008 |
|
| RGAV | Abandon patent right to avoid regrant |