CN102357723B - 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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- CN102357723B CN102357723B CN2011103124695A CN201110312469A CN102357723B CN 102357723 B CN102357723 B CN 102357723B CN 2011103124695 A CN2011103124695 A CN 2011103124695A CN 201110312469 A CN201110312469 A CN 201110312469A CN 102357723 B CN102357723 B CN 102357723B
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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 non-HF arc ignition circuit of numerical controlled plasma cutter 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.Although 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 electromagnetic interference strict place.Under this environment, the non-high-frequency arc strike technology appears.
Non-high-frequency arc strike also claims contacting ignition arc, it requires to depend on after cutting torch and the direct contact short circuit of nozzle the pressure separation little arc that ignites, with air ionization, form plasma-arc between cutting torch and nozzle, along with compressed air sprays from nozzle, formation hot flame stream under its effect, forms electric arc between cutting torch and workpiece.When cutting torch and workpiece electric current being detected and reach certain value, cut off cutting torch and nozzle loop, complete plasma-arc to the conversion of 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 coordinating.Such as the size of little arc current, cut off little arc circuit etc. after the striking success.Often all to use the DSP Digital Control, the control circuit complicated design, and this technology is domestic only has 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 deficiencies in the prior art, a kind of non-HF arc ignition circuit of numerical controlled plasma cutter is provided, it is simple in structure, and is easy to install, reduces costs, and reduces the interference to numerical control device, and good stability is safe and reliable.
According to technical scheme provided by the invention, described non-HF arc ignition circuit of numerical controlled plasma cutter comprises plasma cutting main circuit, and described plasma cutting main circuit is electrically connected to cutting torch, described cutting torch comprises nozzle and electrode, and the connection corresponding to nozzle of described electrode coordinates; Described plasma cutting main circuit is connected with master control borad by circuits for triggering, the output of described master control borad is connected with magnetic valve, and the rifle switch that the current sensor of the input of master control borad electric current when working for detection of cutting torch and being used for is controlled CUT main circuit switch state is connected; Described master control borad also is connected with little arc control panel, and described little arc control panel is connected with nozzle by thermistor and high-power resistance; After rifle switch closure, master control borad starts the CUT main circuit by circuits for triggering, described CUT main circuit produces the killer voltage value on electrode, master control borad makes nozzle be connected with the electrode equipotential by little arc control panel, master control borad is opened magnetic valve simultaneously, the compressed air that sprays by magnetic valve makes nozzle and electrode throw off, and the spark that electrode and nozzle transcient short circuit time produce ionizes compressed air, forms plasma-arc between electrode and nozzle; When compressed air sprays from nozzle, form hot flame stream, when the close workpiece of nozzle, under the effect of high-temperature plasma flame stream, form electric arc between electrode and workpiece; When the current setting value that electrode and workpiece detected when current sensor is complementary, master control borad is by little arc panel cutout electrode and nozzle loop, arc extinction between electrode and nozzle keeps the arc stiffness between electric arc and workpiece simultaneously, completes by the conversion of plasma-arc to cutting arc.
Described current sensor is Hall current sensor.Described little arc control panel comprises relay, and the coil of described relay is connected with the output of master control borad, and the contact of relay is connected by thermistor and high-power resistance.
Described thermistor is PTC SY16P.The resistance of described high-power resistance is 32 Ω.Described relay is the DC24V relay.
Advantage of the present invention: the circuit design simple optimizing, safe and reliable, input cost is lower, effectively avoids High-frequency Interference on the impact of numerical control device, has reduced damage and the misoperation of numerical control servomechanism (raising device), ensures the digital control system normal operation; Have in order to reduce the loss of nozzle, except reducing in operating process unnecessary striking, reduction striking electric current is the life-span of prolonging nozzle effectively, guarantees the reliable transfer of electric arc from the nozzle to the workpiece again; Little arc current can be adjusted by the resistance of thermistor, operates very convenient.
Description of drawings
Fig. 1 is 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
The invention will be further described below in conjunction with concrete drawings and Examples.
As shown in Figure 1: described arc ignition circuit comprises the CUT main circuit, described CUT main circuit is connected with cutting torch, and described cutting torch comprises electrode and nozzle, and described electrode is connected with the nozzle corresponding matching, when initial, electrode is connected with the contact of nozzle equipotential.The CUT main circuit is connected with master control borad by circuits for triggering, the input of described master control borad is connected with the current sensor that the rifle switch reaches for detection of the cutting torch operating current, the output of master control borad also is connected with magnetic valve and little arc control panel, and little arc control panel is connected with nozzle by thermistor PTC and high-power resistance R.When the rifle switch was closed, master control borad started by trigger circuit triggers CUT main circuit.The CUT main circuit is by being connected with cutting torch and workpiece by capacitor C 1, capacitor C 2 and capacitor C 3 respectively, and described capacitor C 1, capacitor C 2 and capacitor C 3 are all output protection electric capacity.Magnetic valve is used for controlling the injection of Compressed Gas.Particularly, little arc control panel comprises relay, and described relay is the DC24V relay, and the coil of relay is connected with the output of master control borad, and the contact of relay is connected with nozzle by thermistor PTC and high-power resistance R.
As shown in Figure 2: U is CUT main circuit output voltage; IF is 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 electrode and nozzle transcient short circuit time to produce ionizes compressed air, forms plasma-arc between electrode and nozzle.Along with compressed air sprays from nozzle, form hot flame stream, when the close workpiece of nozzle of cutting torch, under the effect of high-temperature plasma flame stream, form electric arc between electrode and workpiece.After electric current that current sensor IF detects electrode and workpiece reaches setting value, master control borad makes break of contact electrode and the nozzle loop of relay, arc extinction between electrode and nozzle keeps the arc stiffness between electric arc and workpiece simultaneously, completes by the conversion of plasma-arc to cutting arc.
As depicted in figs. 1 and 2: when CUT and digital control system online complete, 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 described CUT main circuit produces voltage on electrode; Simultaneously, master control borad makes the relay coil on little arc control panel charged, and corresponding normally opened contact is closed, and the normally opened contact after closure forms the closed-loop path through resistance R and thermistor PTC SY16P, has little electric current between electrode and nozzle.Magnetic valve gets electronic work simultaneously, and air flow is thrown off electrode and nozzle by plasma cutting gun, is throwing off moment formation plasma arc, when the close workpiece of nozzle of cutting torch, under the effect of high-temperature plasma flame stream, forms electric arc between electrode and workpiece.After the striking success, current sensor IF detects the large electric current on electrode and workpiece, the current signal of sampling is fed back to master control borad, feedback signal process operational amplifier and FET are the DC24V relay that offers on little arc control panel, the normally opened contact of relay is in normally open, and little arc circuit is disconnected.Arc extinction between electrode and nozzle is realized striking; Make the CUT normal operation.
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 appears, electric current by 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 injury are reduced unnecessary loss.
Circuit design simple optimizing of the present invention, safe and reliable, input cost is lower, effectively avoids High-frequency Interference on the impact of numerical control device, has reduced damage and the misoperation of numerical control servomechanism (raising device), ensures the digital control system normal operation; Have again in order to reduce the loss of nozzle, except reducing in operating process unnecessary striking, reduction striking electric current is the life-span of prolonging nozzle effectively, but too low striking electric current can make little arc stbility variation, easily cause current interruption when shifting cutting, choose suitable striking size of current in 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 by the resistance of thermistor, operates very convenient.
Claims (6)
1. a non-HF arc ignition circuit of numerical controlled plasma cutter, comprise the CUT main circuit, and described CUT main circuit is electrically connected to cutting torch, and described cutting torch comprises nozzle and electrode, and the connection corresponding to nozzle of described electrode coordinates; It is characterized in that: described CUT main circuit is connected with master control borad by circuits for triggering, the output of described master control borad is connected with magnetic valve, and the rifle switch that the current sensor of the input of master control borad electric current when working for detection of cutting torch and being used for is controlled CUT main circuit switch state is connected; Described master control borad also is connected with little arc control panel, and the relay on described little arc control panel is connected with nozzle by thermistor (PTC) and high-power resistance (R); After rifle switch closure, master control borad starts the CUT main circuit by circuits for triggering, described CUT main circuit produces the killer voltage value on electrode, master control borad makes nozzle and electrode form the closed-loop path by little arc control panel relay, master control borad is opened magnetic valve simultaneously, the compressed air that sprays by magnetic valve makes nozzle and electrode throw off, and the spark that electrode and nozzle transcient short circuit time produce ionizes compressed air, forms plasma-arc between electrode and nozzle; When compressed air sprays from nozzle, form hot flame stream, when the close workpiece of nozzle, under the effect of high-temperature plasma flame stream, form electric arc between electrode and workpiece; When the current setting value that electrode and workpiece detected when current sensor is complementary, master control borad is by little arc panel cutout electrode and nozzle loop, arc extinction between electrode and nozzle keeps the arc stiffness between electric arc and workpiece simultaneously, completes by the conversion of plasma-arc to cutting arc.
2. non-HF arc ignition circuit of numerical controlled plasma cutter according to claim 1, it is characterized in that: described current sensor is Hall current sensor.
3. non-HF arc ignition circuit of numerical controlled plasma cutter according to claim 1, it is characterized in that: described little arc control panel comprises relay, the coil of described relay is connected with the output of master control borad, and the contact of relay is connected with nozzle by thermistor (PTC) and high-power resistance (R).
4. non-HF arc ignition circuit of numerical controlled plasma cutter according to claim 1, it is characterized in that: described thermistor (PTC) is PTC SY16P.
5. non-HF arc ignition circuit of numerical controlled plasma cutter according to claim 1, it is characterized in that: the resistance of described high-power resistance (R) is 32 Ω.
6. non-HF arc ignition circuit of numerical controlled plasma cutter according to claim 3, it is characterized in that: described relay is the DC24V relay.
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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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| BR102014021846A2 (en) * | 2014-09-03 | 2015-12-01 | Powermig Automação E Soldagem Ltda | plasma torch control and identification circuit |
| 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 |
| 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 |
| CN110899936A (en) * | 2020-01-15 | 2020-03-24 | 上海焊煌电气有限公司 | Circuit for detecting welding current and transferred arc current of 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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| FR1583775A (en) * | 1968-03-19 | 1969-12-05 | ||
| DD97842A1 (en) * | 1972-06-29 | 1973-05-21 | ||
| CN201063956Y (en) * | 2007-05-29 | 2008-05-21 | 赵有生 | Air plasma cutting machine |
| CN101596636B (en) * | 2009-07-08 | 2011-10-05 | 四川电子焊接设备公司 | Split-type high frequency controller |
| 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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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. |