CN202097491U - Plasma cutting pilot arc circuit - Google Patents
Plasma cutting pilot arc circuit Download PDFInfo
- Publication number
- CN202097491U CN202097491U CN2011201755180U CN201120175518U CN202097491U CN 202097491 U CN202097491 U CN 202097491U CN 2011201755180 U CN2011201755180 U CN 2011201755180U CN 201120175518 U CN201120175518 U CN 201120175518U CN 202097491 U CN202097491 U CN 202097491U
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit
- triode
- fet
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model provides a plasma cutting pilot arc circuit which comprises a first detection circuit, a control circuit connected with the first detection circuit, a second detection circuit connected with the control circuit, a signal control circuit connected with the second detection circuit, a given circuit and a signal generating circuit. The plasma cutting pilot arc circuit solves the technical problems that as the current passes through a thermister to cause serious heating when the traditional cutting gun operates, pilot arc cannot pass through continuously, and the repeated pilot arc function is poorer; by adopting the improved circuit, the pilot arc current during cutting is constant, the sprayed electric arc is continuous and the pilot arc is carried repeatedly; and the power consumption is small, the pilot arc current is stable, and the success rate of electric arc transfer is high.
Description
Technical field
The utility model relates to cutting machine control field, is specifically related to a kind of plasma cutting keep-alive circuit.
Background technology
Tradition is the electrode of the cutting gun negative pole of connecting with the mains; Received positive source by sleeve resistance and positive temperature thermistor on the nozzle string; When pressing gunman's switch, electrode and nozzle form high-frequency discharge, and the output voltage of machine forms tiny electric arc through the resistance and the high frequency of series connection simultaneously; Electrode and nozzle form current loop, between nozzle and electrode, have formed the electric arc of a less electric current.This electric arc compresses through compressed air, from nozzle, penetrates.When electric current logical wherein cross thermistor the time, more serious because of electric current through the thermistor heating, back ground current can not be passed through continuously, make and realize that the repetition arc maintenance is relatively poor.
Summary of the invention
In order to solve traditional cutting gun since when work electric current more serious through the thermistor heating, back ground current can not be passed through continuously, make the relatively poor technical problem of repetition arc maintenance function, the utility model provides a kind of plasma cutting keep-alive circuit.
For realizing above-mentioned purpose, the technical scheme of the utility model is following:
A kind of plasma cutting keep-alive circuit comprises first testing circuit, the control circuit that is connected with first testing circuit; Second testing circuit that is connected with control circuit is with the signal control circuit that second testing circuit is connected, given circuit and signal generating circuit.
As the further improvement of technique scheme, said first testing circuit comprises: FET Q601, the comparator U1B that is connected with the grid of FET Q601; The relay J 1A that is connected with the drain electrode of FET Q601; The input of said comparator U1B is provided with capacitor C 601, resistance R 602, resistance R 604, resistance R 603; Be provided with resistance R 605 between said comparator U1B and the FET Q601, be provided with capacitor C 602 between the grid of said FET Q601 and the source electrode, and with capacitor C 602 parallel resistor R606; Be in series with resistance R 630 and parallel diode D604 on the said relay J 1A.
As the further improvement of technique scheme, said control circuit comprises FET Q602, with the resistance R 614 that the grid of FET Q602 is connected successively, and diode D610, resistance R 616, diode D605 and resistance R 615; Be arranged at the capacitor C 612 between FET Q602 grid and the source electrode; With the diode D603 that FET Q602 drain electrode is connected, the relay J 2A parallelly connected with diode D603.
Further improvement as technique scheme; Said second testing circuit comprises triode Q607; The resistance R 627 that is connected with triode Q607 base stage; One end is connected with triode Q607 colelctor electrode, and the other end is connected in the K switch 1 between diode D610 and the resistance R 616, is arranged between the collector and emitter of triode Q607 and diode in series D606 and capacitor C 614 each other.
As the further improvement of technique scheme, said signal control circuit comprises the base stage that is connected in triode Q606 successively and diode D607 and the resistance R 626 between diode D606 and the capacitor C 614; Be arranged at the resistance R 625 between base stage and the emitter stage; Be arranged at resistance R 622 and resistance R 621 on the colelctor electrode.
As the further improvement of technique scheme, said given circuit comprises triode Q605, the triode Q603 that emitter stage is connected with triode Q605 base stage; The adjustable resistance VR1 that is connected with the base stage of triode Q603; The resistance R 619 of connecting with adjustable resistance VR1, the resistance R 620 that is connected with the colelctor electrode of triode Q603; The emitter stage of said triode Q607, capacitor C 614, resistance R 625, and the emitter stage of triode Q605 and triode Q606 is connected the given signal of back output current; Be provided with resistance R 624 between the emitter stage of said triode Q605 and triode Q606.
As the further improvement of technique scheme, said signal generating circuit comprises the adjustable resistance VR2 that adjustable end is connected with resistance R 621, and a wherein end of link is connected with adjustable resistance VR1, and the other end is in series with resistance R 623; The capacitor C 613 parallelly connected with resistance R 623.
Implement the plasma cutting keep-alive circuit of the utility model, have following beneficial effect:
1, through the circuit after improving, back ground current is constant when making cutting, and the electric arc of ejection is continuous, repeatable arc maintenance;
2, power dissipation is little, and back ground current is stable, and the arc transfer success rate is high.
Description of drawings
Fig. 1 is the theory diagram of the utility model;
Fig. 2 is the circuit diagram of the utility model;
Fig. 3 is the oscillogram of the utility model.
Description of reference numerals:
The specific embodiment:
Referring to Fig. 1-shown in Figure 2, the plasma cutting keep-alive circuit that the utility model provides comprises testing circuit 1, the control circuit 2 that is connected with first testing circuit 1; Second testing circuit 3 that is connected with control circuit 2 is with the signal control circuit 4 that second testing circuit 3 is connected, given circuit 5 and signal generating circuit 6.Wherein testing circuit 1 mainly has or not the signal controlling high frequency relay according to output current, and realizing has electric current not have high frequency; Control circuit 2 mainly is that the arc maintenance relay is controlled; The transferred arc signal is a low level when cut workpiece; Do not have back ground current when realizing cutting, second testing circuit 3 is to judge that for tongue tube having or not cutting current, this device to be installed in coil goes into; Become normally off as the cutting current tongue tube, and control the transferred arc signal with the hand switch signal; Signal control circuit 4 switches given signal according to the transferred arc signal; Given circuit 5 mainly be to given signal carry out output signal generating circuit 6 mainly be output arc maintenance and cutting current give decide signal.
Particularly, first testing circuit 1 comprises FET Q601, the comparator U1B that is connected with the grid of FET Q601; The relay J 1A that is connected with the drain electrode of FET Q601; The input of comparator U1B is provided with capacitor C 601, resistance R 602, resistance R 604; Resistance R 603; Be provided with resistance R 605 between comparator U1B and the FET Q601, be provided with capacitor C 602 between the grid of FET Q601 and the source electrode, and with capacitor C 602 parallel resistor R606; Resistance R 630 and parallel diode D604 have been in series with on the relay J 1A.Control circuit 2 comprises FET Q602, with the resistance R 614 that the grid of FET Q602 is connected successively, and diode D610, resistance R 616, diode D605 and resistance R 615; Be arranged at the capacitor C 612 between FET Q602 grid and the source electrode; The diode D603 that is connected with FET Q602 drain electrode; The relay J 2A parallelly connected with diode D603; Draw output cathode end and arc maintenance terminals from relay J 2A, owing to do not have the connecting resistance device from power supply output cathode to arc maintenance terminals, thus the loss of power when having reduced arc maintenance.Second testing circuit 3 comprises triode Q607; Resistance R 627, one ends that are connected with triode Q607 base stage are connected with triode Q607 colelctor electrode, and the other end is connected in the K switch 1 between diode D610 and the resistance R 616; This switching tube K1 is tongue tube; This tongue tube is installed in coil, and when coil had electric current to pass through, tongue tube became normally off from normally open. be arranged between the collector and emitter of triode Q607 and diode in series D606 and capacitor C 614 each other.Signal control circuit 4 comprises the base stage that is connected in triode Q606 successively and diode D607 and the resistance R 626 between diode D606 and the capacitor C 614; Be arranged at the resistance R 625 between base stage and the emitter stage; Be arranged at resistance R 622 and resistance R 621 on the colelctor electrode.Given circuit 5 comprises triode Q605, the triode Q603 that emitter stage is connected with triode Q605 base stage; The adjustable resistance VR1 that is connected with the base stage of triode Q603; The resistance R 619 of connecting with adjustable resistance VR1, the resistance R 620 that is connected with the colelctor electrode of triode Q603; The emitter stage of triode Q607, capacitor C 614, resistance R 625, and the given signal of emitter stage output current of triode Q606; Be provided with resistance R 624 between the emitter stage of triode Q605 and triode Q606.Signal generating circuit 6 comprises the adjustable resistance VR2 that adjustable end is connected with resistance R 621, in the link wherein an end be connected with adjustable resistance VR1, the other end is in series with resistance R 623; The capacitor C 613 parallelly connected with resistance R 623.Cutting gun provides back ground current by circuit when the arc maintenance state, press the rifle switch, high-frequency high-voltage signal work and add to electrode and nozzle on; Add to nozzle on through arc maintenance control relay from positive source this moment, and the power cathode receiving electrode produces electric arc between electrode and the nozzle; Form current loop, this electric current is constant, when arc transfer to workpiece, breaks off high frequency; Cutting current detects by tongue tube control, and tongue tube is installed in the inductance coil, and the action of cutting current tongue tube is arranged; The given conversion with the given signal of cutting current of this signal controlling back ground current; Wherein tongue tube is motionless as the back ground current signal feeding, and breaks off the arc maintenance control relay according to this signal, and the realization cut state does not have back ground current.
Shown in Fig. 2-3; The utility model at first detects output current signal through comparator U1B, and when big electric current was exported, comparator U1B output transferred low level to by high level; FET Q601 carries and ends; Thereby high frequency control relay J1A does not have power supply, breaks off high-frequency signal, realizes having the no high frequency of electric current output.Secondly, the back ground current break-make is controlled, because the tongue tube coil tandem is at positive output end; When the transferred arc workpiece has electric current to pass through; The tongue tube action becomes normally off, and back ground current control relay J2A breaks off, and has realized cut workpiece disconnection back ground current.Then, through 3 pairs of arc transfer input of second testing circuit, when the arc transfer workpiece, a control signal is provided, control inverter continues workpiece.Through 4 pairs of given controls of back ground current of signal control circuit, be the given signal controlling of back ground current under the arc maintenance state then, the transferred arc signal is a high level, the Zener diode conducting, and back ground current is controlled by adjustable resistance VR1.Again through arc maintenance or the given output signal of cutting current; In electric current output given circuit, when cut workpiece, the transferred arc signal is a low level, not conducting of Zener diode, and output current is controlled by adjustable resistance VR2.Because back ground current is given to be to separate control with the given signal of output current, and detects output current through tongue tube, make to be the electric current constant current under the arc maintenance state.
Above embodiment only is that the utility model is described, yet the utility model is not limited thereto.For the one of ordinary skilled in the art, also be regarded as the protection domain of the utility model not breaking away from various improvement outside the utility model thought range.
Claims (7)
1. a plasma cutting keep-alive circuit is characterized in that: comprise first testing circuit, the control circuit that is connected with first testing circuit; Second testing circuit that is connected with control circuit is with the signal control circuit that second testing circuit is connected, given circuit and signal generating circuit.
2. plasma cutting keep-alive circuit according to claim 1, it is characterized in that: said first testing circuit comprises: FET Q601, the comparator U1B that is connected with the grid of FET Q601; The relay J 1A that is connected with the drain electrode of FET Q601; The input of said comparator U1B is provided with capacitor C 601, resistance R 602, resistance R 604, resistance R 603; Be provided with resistance R 605 between said comparator U1B and the FET Q601, be provided with capacitor C 602 between the grid of said FET Q601 and the source electrode, and with capacitor C 602 parallel resistor R606; Be in series with resistance R 630 and parallel diode D604 on the said relay J 1A.
3. plasma cutting keep-alive circuit according to claim 2; It is characterized in that: said control circuit comprises FET Q602, with the resistance R 614 that the grid of FET Q602 is connected successively, diode D610; Resistance R 616, diode D605 and resistance R 615; Be arranged at the capacitor C 612 between FET Q602 grid and the source electrode; With the diode D603 that FET Q602 drain electrode is connected, the relay J 2A parallelly connected with diode D603.
4. plasma cutting keep-alive circuit according to claim 3; It is characterized in that: said second testing circuit comprises triode Q607; The resistance R 627 that is connected with triode Q607 base stage; One end is connected with triode Q607 colelctor electrode, and the other end is connected in the K switch 1 between diode D610 and the resistance R 616, is arranged between the collector and emitter of triode Q607 and diode in series D606 and capacitor C 614 each other.
5. plasma according to claim 4 cutting keep-alive circuit is characterized in that: said signal control circuit comprises the base stage that is connected in triode Q606 successively and diode D607 and the resistance R 626 between diode D606 and the capacitor C 614; Be arranged at the resistance R 625 between base stage and the emitter stage; Be arranged at resistance R 622 and resistance R 621 on the colelctor electrode.
6. plasma cutting keep-alive circuit according to claim 5, it is characterized in that: said given circuit comprises triode Q605, the triode Q603 that emitter stage is connected with triode Q605 base stage; The adjustable resistance VR1 that is connected with the base stage of triode Q603; The resistance R 619 of connecting with adjustable resistance VR1, the resistance R 620 that is connected with the colelctor electrode of triode Q603; The emitter stage of said triode Q607, capacitor C 614, resistance R 625, and the emitter stage of triode Q605 and triode Q606 is connected the given signal of back output current; Be provided with resistance R 624 between the emitter stage of said triode Q605 and triode Q606.
7. plasma cutting keep-alive circuit according to claim 6; It is characterized in that: said signal generating circuit comprises the adjustable resistance VR2 that adjustable end is connected with resistance R 621; A wherein end of link is connected with adjustable resistance VR1, and the other end is in series with resistance R 623; The capacitor C 613 parallelly connected with resistance R 623.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201755180U CN202097491U (en) | 2011-05-26 | 2011-05-26 | Plasma cutting pilot arc circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201755180U CN202097491U (en) | 2011-05-26 | 2011-05-26 | Plasma cutting pilot arc circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202097491U true CN202097491U (en) | 2012-01-04 |
Family
ID=45383524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201755180U Expired - Lifetime CN202097491U (en) | 2011-05-26 | 2011-05-26 | Plasma cutting pilot arc circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202097491U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103386541A (en) * | 2013-07-11 | 2013-11-13 | 哈尔滨工业大学 | Plasma arc method for perforating key hole by current |
| CN106735800A (en) * | 2017-03-17 | 2017-05-31 | 浙江三锋实业股份有限公司 | A kind of CUT arc maintenance electronics current-limiting resistance circuit |
| CN108031960A (en) * | 2017-12-07 | 2018-05-15 | 深圳市佳士科技股份有限公司 | A kind of constant current arc-maintaining device and cutting machine |
| CN108296617A (en) * | 2018-03-07 | 2018-07-20 | 上海威特力焊接设备制造股份有限公司 | Regulating current device and method for plasma cutting machine |
| CN115255582A (en) * | 2022-08-02 | 2022-11-01 | 友力机电有限公司 | Inverter type direct-current plasma double-air-valve cutting machine and control circuit |
-
2011
- 2011-05-26 CN CN2011201755180U patent/CN202097491U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103386541A (en) * | 2013-07-11 | 2013-11-13 | 哈尔滨工业大学 | Plasma arc method for perforating key hole by current |
| CN103386541B (en) * | 2013-07-11 | 2015-05-20 | 哈尔滨工业大学 | Plasma arc method for perforating key hole by current |
| CN106735800A (en) * | 2017-03-17 | 2017-05-31 | 浙江三锋实业股份有限公司 | A kind of CUT arc maintenance electronics current-limiting resistance circuit |
| CN106735800B (en) * | 2017-03-17 | 2022-04-01 | 浙江三锋实业股份有限公司 | Plasma cutting machine pilot arc electron current-limiting resistance circuit |
| CN108031960A (en) * | 2017-12-07 | 2018-05-15 | 深圳市佳士科技股份有限公司 | A kind of constant current arc-maintaining device and cutting machine |
| CN108031960B (en) * | 2017-12-07 | 2023-06-23 | 深圳市佳士科技股份有限公司 | Constant-current arc maintaining device and cutting machine |
| CN108296617A (en) * | 2018-03-07 | 2018-07-20 | 上海威特力焊接设备制造股份有限公司 | Regulating current device and method for plasma cutting machine |
| CN108296617B (en) * | 2018-03-07 | 2023-06-20 | 上海威特力焊接设备制造股份有限公司 | Current regulating device and method for plasma cutting machine |
| CN115255582A (en) * | 2022-08-02 | 2022-11-01 | 友力机电有限公司 | Inverter type direct-current plasma double-air-valve cutting machine and control circuit |
| CN115255582B (en) * | 2022-08-02 | 2023-12-08 | 友力机电有限公司 | Inverter type direct-current plasma double-air-valve cutting machine and control circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202097491U (en) | Plasma cutting pilot arc circuit | |
| CN104377513A (en) | Socket, remote controller and control method of socket | |
| CN103186106B (en) | A kind of high voltage direct current control switch | |
| CN103111719B (en) | High frequency arc ignition circuit with direct current voltage output | |
| CN104625368B (en) | Inversion transferred arc formula cutting machine controls device | |
| CN203245482U (en) | High-frequency arc starting circuit with direct-current voltage output | |
| CN205016421U (en) | Relay switch drive arrangement and domestic appliance | |
| CN104244545A (en) | Triggering pre-burning device with xenon lamp | |
| CN102683112A (en) | Energy-saving controller for coil of relay | |
| CN201967233U (en) | Leading arc circuit controlled by single-tube IGBT | |
| CN209766279U (en) | Timer delay circuit | |
| CN201366574Y (en) | Plasma cutting machine with guide arc switching circuit | |
| CN103308852A (en) | Full-isolation relay contact action detecting circuit | |
| CN207560426U (en) | A kind of novel high-frequency arc ignition control circuit | |
| CN203918180U (en) | A kind of transfer starting the arc control circuit of electric welding machine | |
| CN202564138U (en) | Energy-saving controller of relay coil | |
| CN104376669A (en) | High-frequency capacitive reactance type wireless cable anti-theft alarm | |
| CN208971118U (en) | A kind of overcurrent, short-circuit protection circuit and Switching Power Supply | |
| CN2865278Y (en) | Efficient energy-saving fish-catching device | |
| CN216490430U (en) | Time-delay power supply circuit | |
| CN211727866U (en) | Non-contact arc striking inversion type plasma cutting machine transferred arc control circuit | |
| CN210789625U (en) | Plasma cutting machine circuit of supplying gas in advance | |
| CN108565961A (en) | There is one kind counnter attack to fill power supply automatic switchover without crushing output circuit | |
| CN103094026A (en) | Circuit for improving traveling wave tube amplifier filament service life | |
| CN102126075A (en) | Leading arc circuit controlled by single tube IGBT |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120104 |
|
| CX01 | Expiry of patent term |