CN102357723A - Non-high-frequency arc ignition circuit of computer numerical control (CNC) plasma cutting machine - Google Patents
Non-high-frequency arc ignition circuit of computer numerical control (CNC) plasma cutting machine Download PDFInfo
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- CN102357723A CN102357723A CN2011103124695A CN201110312469A CN102357723A CN 102357723 A CN102357723 A CN 102357723A CN 2011103124695 A CN2011103124695 A CN 2011103124695A CN 201110312469 A CN201110312469 A CN 201110312469A CN 102357723 A CN102357723 A CN 102357723A
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Abstract
The invention relates to a non-high-frequency arc ignition circuit of a computer numerical control (CNC) plasma cutting machine. The non-high-frequency arc ignition circuit comprises a plasma-cutting main circuit, wherein, the plasma-cutting main circuit is connected with a master control board through a trigger circuit; the master control board is connected with a solenoid valve, a current sensor, a spray gun switch and a minor arc control board; and the minor arc control board is connected with a nozzle through a thermistor and a high-power resistor. In the invention, the nozzle is separated from an electrode by adopting the compressed air sprayed by the solenoid valve, and sparks which are generated during the short circuit between the electrode and the nozzle ionize the compressed air so as to form a plasma arc between the electrode and the nozzle; when the compressed air is sprayed out of the nozzle to form a high-temperature flame flow and the nozzle is close to a workpiece, an arc is formed between the electrode and the workpiece under the action of the high-temperature plasma flame flow; and when the current sensor detects that the electrode is matched with a set current value of the workpiece, the arc between the electrode and the nozzle is extinguished. The non-high-frequency arc ignition circuit of the CNC plasma cutting machine has the advantages of simple structure, lowered cost, fewer interferences on the NC equipment, good stability, and safety and reliability.
Description
Technical field
The present invention relates to a kind of arc ignition circuit, especially a kind of numerical control plasma cutting machine non-high-frequency arc strike circuit belongs to the technical field of cutting machine striking.
Background technology
Numerical control plasma cutting machine is efficient, and is quick, extensively promoted and uses in the welding industry.Though because traditional high-frequency and high-voltage striking technology has higher arcing initiation success rate, the serious electromagnetic interference that can't avoid high-frequency and high-voltage to cause can't be used in automatic numerical control cutting and the strict place of electromagnetic interference.Under this environment, the non-high-frequency arc strike technology appears.
Non-high-frequency arc strike is also claimed contacting ignition arc; It requires to separate and the little arc that ignites by air pressure behind the direct contact short circuit of cutting torch and nozzle, with air ionization, between cutting torch and nozzle, forms plasma-arc; Along with compressed air sprays from nozzle; Formation hot flame stream under its effect, forms electric arc between cutting torch and the workpiece.When detecting cutting torch and workpiece electric current and reach certain value, cut off cutting torch and nozzle loop, completion has the conversion of plasma-arc to cutting arc.
This striking mode is except very high to cutting torch structure requirement on machining accuracy, and circuit also has very high requirement on cooperating.Such as the size of little arc current, striking success back cuts off little arc circuit etc.Often all to use the DSP Digital Control, the control circuit complicated design, and this technology is domestic has only minority R&D team to grasp also in continuous research and development and improving.
Summary of the invention
The objective of the invention is to overcome the deficiency that exists in the prior art, a kind of numerical control plasma cutting machine non-high-frequency arc strike circuit is provided, it is simple in structure, and is easy to install, reduces cost, and reduces the interference to numerical control device, and good stability is safe and reliable.
According to technical scheme provided by the invention; Said numerical control plasma cutting machine non-high-frequency arc strike circuit comprises plasma cutting main circuit, and said plasma cutting main circuit is electrically connected with cutting torch; Said cutting torch comprises nozzle and electrode, and the corresponding connection with nozzle of said electrode cooperates; Said plasma cutting main circuit links to each other with master control borad through circuits for triggering; The output of said master control borad links to each other with magnetic valve, and the rifle switch that the current sensor of the input of master control borad electric current when being used to detect cutting torch work and being used to is controlled CUT main circuit switch state links to each other; Said master control borad also links to each other with little arc control panel, and said little arc control panel links to each other with nozzle through thermistor and high-power resistance; Behind the rifle switch closure; Master control borad starts the CUT main circuit through circuits for triggering, and said CUT main circuit produces the killer voltage value on electrode, and master control borad makes nozzle be connected with the electrode equipotential through little arc control panel; Master control borad is opened magnetic valve simultaneously; Compressed air through the magnetic valve ejection makes nozzle and electrode throw off, and the spark that electrode and nozzle transcient short circuit time produce forms plasma-arc with compressed air ionization between electrode and nozzle; When compressed air sprays from nozzle, form hot flame stream, during near workpiece, under the effect of high-temperature plasma flame stream, form electric arc between electrode and the workpiece at nozzle; When current sensor senses when the current setting value of electrode and workpiece is complementary; Master control borad is through little arc panel cutout electrode and nozzle loop; Arc extinction between electrode and the nozzle keeps the arc stiffness between electric arc and workpiece simultaneously, accomplishes by the conversion of plasma-arc to cutting arc.
Said current sensor is a Hall current sensor.Said little arc control panel comprises relay, and the coil of said relay links to each other with the output of master control borad, and the contact of relay links to each other through thermistor and high-power resistance.
Said thermistor is PTC SY16P.The resistance of said high-power resistance is 32 Ω.Said relay is the DC24V relay.
Advantage of the present invention: the circuit design simple optimizing, safe and reliable, input cost is lower, avoids the influence of High-frequency Interference to numerical control device effectively, has reduced the damage and the misoperation of numerical control servomechanism (raising device), ensures the digital control system operate as normal; Have again in order to reduce the loss of nozzle,, reduce the life-span that the striking electric current can effectively prolong nozzle, guarantee the reliable transfer of electric arc from the nozzle to the workpiece except in operating process, reducing the unnecessary striking; Little arc current can be adjusted through the resistance of thermistor, and it is very convenient to operate.
Description of drawings
Fig. 1 is a structure principle chart of the present invention.
Fig. 2 is the schematic diagram of electrode of the present invention and nozzle corresponding matching.
The specific embodiment
Below in conjunction with concrete accompanying drawing and embodiment the present invention is described further.
As shown in Figure 1: said arc ignition circuit comprises the CUT main circuit; Said CUT main circuit links to each other with cutting torch, and said cutting torch comprises electrode and nozzle, and said electrode is connected with the nozzle corresponding matching; When initial, electrode is connected with the contact of nozzle equipotential.The CUT main circuit links to each other with master control borad through circuits for triggering; The input of said master control borad with the rifle switch and the current sensor that is used to detect the cutting torch operating current link to each other; The output of master control borad also links to each other with magnetic valve and little arc control panel, and little arc control panel links to each other with nozzle through thermistor PTC and high-power resistance R.When the rifle switch closure, master control borad starts through trigger circuit triggers CUT main circuit.The CUT main circuit is through linking to each other with cutting torch and workpiece through capacitor C 1, capacitor C 2 and capacitor C 3 respectively, and said capacitor C 1, capacitor C 2 and capacitor C 3 all are output protection electric capacity.Magnetic valve is used to control the injection of Compressed Gas.Particularly, little arc control panel comprises relay, and said relay is the DC24V relay, and the coil of relay links to each other with the output of master control borad, and the contact of relay links to each other with nozzle through thermistor PTC and high-power resistance R.
As shown in Figure 2: U is a CUT main circuit output voltage; IF is a Hall current sensor; R (50W/32 Ω) is high-power resistance and thermistor PTC (PTC SY16P).When welding machine work was initial, electrode and nozzle were in short-circuit condition, and process high-power resistance R and thermistor PTC and DC24V relay contact form little current loop.Forming the loop simultaneously, the action of the magnetic valve of welding machine, air flow is thrown off electrode and nozzle, and the spark that utilizes the generation of electrode and nozzle transcient short circuit time forms plasma-arc with compressed air ionization between electrode and nozzle.Along with compressed air sprays from nozzle, form hot flame stream, during near workpiece, under the effect of high-temperature plasma flame stream, form electric arc between electrode and the workpiece at the nozzle of cutting torch.After electric current that current sensor IF detects electrode and workpiece reaches setting value; Master control borad makes the break of contact electrode and the nozzle loop of relay; Arc extinction between electrode and the nozzle keeps the arc stiffness between electric arc and workpiece simultaneously, accomplishes by the conversion of plasma-arc to cutting arc.
As depicted in figs. 1 and 2: when CUT with digital control system is online finishes, set cutting current, and some parameters such as digital control system Height-adjusting device arc voltage.Press the rifle switch, the master control borad control triggering electric circuit makes the work of CUT main circuit, and said CUT main circuit produces voltage on electrode; Simultaneously, master control borad makes that the relay coil on the little arc control panel is charged, and corresponding normally opened contact is closed, and the normally opened contact after the closure forms the closed-loop path through resistance R and thermistor PTC SY16P, between electrode and nozzle, has little electric current.Simultaneously magnetic valve gets electronic work, and air flow is thrown off through plasma cutting small of the stock electrode and nozzle, forms plasma arc throwing off moment, during near workpiece, under the effect that the high-temperature plasma flame flows, forms electric arc between electrode and the workpiece at the nozzle of cutting torch.After the striking success; Current sensor IF detects the big electric current on electrode and the workpiece; Feed back to master control borad to the current signal of sampling; Feedback signal process operational amplifier and FET are offering the DC24V relay on the little arc control panel, and the normally opened contact of relay is in normally open, and little arc circuit is broken off.Arc extinction between electrode and nozzle is realized striking; Make the CUT operate as normal.
The present invention is mainly used in the arc ignition circuit of CUT, as in arc process, the short circuit phenomenon that electrode and nozzle do not have disengagement or other reasons occurs; Electric current through thermistor PTC is long, reaches its Curie point, and resistance can be doubled and redoubled; Make little arc current become very little; After problem was got rid of, thermistor also had self-recovering function, can also work on.Simultaneously also avoid electrode and nozzle are caused damage, reduce unnecessary loss.
Circuit design simple optimizing of the present invention, safe and reliable, input cost is lower, avoids the influence of High-frequency Interference to numerical control device effectively, has reduced the damage and the misoperation of numerical control servomechanism (raising device), ensures the digital control system operate as normal; Have again in order to reduce the loss of nozzle; Except in operating process, reducing the unnecessary striking; Reduction striking electric current can effectively prolong the life-span of nozzle, but low excessively striking electric current can make little arc stbility variation, causes current interruption when shifting cutting easily; Choose suitable striking size of current in the actual product, guarantee the reliable transfer of electric arc from the nozzle to the workpiece.Little arc current of the present invention can be adjusted through the resistance of thermistor, and it is very convenient to operate.
Claims (6)
1. a numerical control plasma cutting machine non-high-frequency arc strike circuit comprises plasma cutting main circuit, and said plasma cutting main circuit is electrically connected with cutting torch, and said cutting torch comprises nozzle and electrode, and the corresponding connection with nozzle of said electrode cooperates; It is characterized in that: said plasma cutting main circuit links to each other with master control borad through circuits for triggering; The output of said master control borad links to each other with magnetic valve, and the rifle switch that the current sensor of the input of master control borad electric current when being used to detect cutting torch work and being used to is controlled CUT main circuit switch state links to each other; Said master control borad also links to each other with little arc control panel, and the relay on the said little arc control panel links to each other with nozzle through thermistor (PTC) and high-power resistance (R); Behind the rifle switch closure; Master control borad starts the CUT main circuit through circuits for triggering, and said CUT main circuit produces the killer voltage value on electrode, and master control borad makes nozzle and electrode form the closed-loop path through little arc control panel relay; Master control borad is opened magnetic valve simultaneously; Compressed air through the magnetic valve ejection makes nozzle and electrode throw off, and the spark that electrode and nozzle transcient short circuit time produce forms plasma-arc with compressed air ionization between electrode and nozzle; When compressed air sprays from nozzle, form hot flame stream, during near workpiece, under the effect of high-temperature plasma flame stream, form electric arc between electrode and the workpiece at nozzle; When current sensor senses when the current setting value of electrode and workpiece is complementary; Master control borad is through little arc panel cutout electrode and nozzle loop; Arc extinction between electrode and the nozzle keeps the arc stiffness between electric arc and workpiece simultaneously, accomplishes by the conversion of plasma-arc to cutting arc.
2. numerical control plasma cutting machine non-high-frequency arc strike circuit according to claim 1 is characterized in that: said current sensor is a Hall current sensor.
3. numerical control plasma cutting machine non-high-frequency arc strike circuit according to claim 1; It is characterized in that: said little arc control panel comprises relay; The coil of said relay links to each other with the output of master control borad, and the contact of relay links to each other through thermistor (PTC) and high-power resistance (R).
4. numerical control plasma cutting machine non-high-frequency arc strike circuit according to claim 1 is characterized in that: said thermistor (PTC) is PTC SY16P.
5. numerical control plasma cutting machine non-high-frequency arc strike circuit according to claim 1 is characterized in that: the resistance of said high-power resistance (R) is 32 Ω.
6. numerical control plasma cutting machine non-high-frequency arc strike circuit according to claim 3 is characterized in that: said relay is the DC24V relay.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103124695A CN102357723B (en) | 2011-10-17 | 2011-10-17 | Non-high-frequency arc ignition circuit of computer numerical control (CNC) plasma cutting machine |
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| CN2011103124695A CN102357723B (en) | 2011-10-17 | 2011-10-17 | Non-high-frequency arc ignition circuit of computer numerical control (CNC) plasma cutting machine |
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| CN102357723B CN102357723B (en) | 2013-06-12 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106794534A (en) * | 2014-09-03 | 2017-05-31 | 自动化及焊接机股份有限公司 | Plasmatorch is controlled and identification circuit |
| CN109807442A (en) * | 2018-12-28 | 2019-05-28 | 上海沪工焊接集团股份有限公司 | A kind of control method of non-high frequency plasma cutting machine |
| CN110181154A (en) * | 2019-05-30 | 2019-08-30 | 上海米勒焊接设备有限公司 | A kind of control circuit of plasma cutting machine striking line anti-High-frequency Interference automatically |
| CN111872532A (en) * | 2020-08-20 | 2020-11-03 | 深圳市佳士科技股份有限公司 | Cutting machine control device and low-frequency arc striking plasma cutting machine |
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| CN201455506U (en) * | 2009-07-08 | 2010-05-12 | 四川电子焊接设备公司 | Split high-frequency controller |
| CN202271092U (en) * | 2011-10-17 | 2012-06-13 | 无锡市南方电器制造有限公司 | Non-HF arc ignition circuit of numerical controlled plasma cutter |
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2011
- 2011-10-17 CN CN2011103124695A patent/CN102357723B/en active Active
Patent Citations (6)
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| FR1583775A (en) * | 1968-03-19 | 1969-12-05 | ||
| GB1430248A (en) * | 1972-06-29 | 1976-03-31 | Zentralinstitut Schweiss | Apparatus and a method for controlling plasma torches |
| CN201063956Y (en) * | 2007-05-29 | 2008-05-21 | 赵有生 | Air plasma cutting machine |
| CN101596636A (en) * | 2009-07-08 | 2009-12-09 | 四川电子焊接设备公司 | A kind of split-type high frequency controller |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106794534A (en) * | 2014-09-03 | 2017-05-31 | 自动化及焊接机股份有限公司 | Plasmatorch is controlled and identification circuit |
| CN109807442A (en) * | 2018-12-28 | 2019-05-28 | 上海沪工焊接集团股份有限公司 | A kind of control method of non-high frequency plasma cutting machine |
| CN109807442B (en) * | 2018-12-28 | 2021-04-20 | 上海沪工焊接集团股份有限公司 | Control method of non-high-frequency plasma cutting machine |
| CN110181154A (en) * | 2019-05-30 | 2019-08-30 | 上海米勒焊接设备有限公司 | A kind of control circuit of plasma cutting machine striking line anti-High-frequency Interference automatically |
| CN110181154B (en) * | 2019-05-30 | 2024-03-22 | 上海米勒焊接设备有限公司 | Control circuit for automatically resisting high-frequency interference of arc line of plasma cutting machine |
| CN111872532A (en) * | 2020-08-20 | 2020-11-03 | 深圳市佳士科技股份有限公司 | Cutting machine control device and low-frequency arc striking plasma cutting machine |
| CN111872532B (en) * | 2020-08-20 | 2022-03-11 | 深圳市佳士科技股份有限公司 | Cutting machine control device and low-frequency arc striking plasma cutting machine |
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| CN102357723B (en) | 2013-06-12 |
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Effective date of registration: 20150921 Address after: 214196 Sunshine Industrial Park, Donggang Town, Xishan District, Jiangsu, Wuxi, 8 Patentee after: Jiangsu Dade Heavy Industry Co., Ltd. Address before: 214196, Donggang Town, Xishan District, Jiangsu City, East Lake Province, Wuxi Tong Tin West Road Patentee before: Wuxi Nanfang Electric Appliance Manufacturing Co., Ltd. |
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Address after: 214196 No. 28 South Garden Road, Xishan District, Jiangsu, Wuxi, Donggang Patentee after: Jiangsu Dade heavy industry Limited by Share Ltd Address before: 214196 Sunshine Industrial Park, Donggang Town, Xishan District, Jiangsu, Wuxi, 8 Patentee before: Jiangsu Dade Heavy Industry Co., Ltd. |