CN201625832U - Inverter plasma cutting machine with lead arc control device - Google Patents
Inverter plasma cutting machine with lead arc control device Download PDFInfo
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- CN201625832U CN201625832U CN2009202608548U CN200920260854U CN201625832U CN 201625832 U CN201625832 U CN 201625832U CN 2009202608548 U CN2009202608548 U CN 2009202608548U CN 200920260854 U CN200920260854 U CN 200920260854U CN 201625832 U CN201625832 U CN 201625832U
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Abstract
The utility model relates to an inverter plasma cutting machine with a lead arc control device, which comprises a cutting gun (1), an air flow control device (2) and a current control device. The air flow control device comprises an air regulator (21), an electromagnetic air inlet valve (22) and an electromagnetic air exhaust valve (23), wherein the air regulator (21) is connected with the air inlet valve (22), and the air exhaust valve (23) is disposed between the air inlet valve (22) and the cutting gun (1). The inverter plasma cutting machine has the advantages that 1, the air inlet valve is used for controlling on and off of air flow, the air exhaust valve is used for controlling flow rate and pressure of air, arc striking can be realized again after the air is cooled in a delay form, the air inlet valve is closed, residual air in the cutting gun can be exhausted via the air exhaust valve quickly so as to completely eliminate pressure in the cutting gun, and an electrode contacts with a nozzle to realize re-arcing, 2, after finishing cutting, the nozzle can be cooled via large air flow, and 3, current can be adjusted and controlled by aid of a PWM pulse width controller, and the control circuit is simple, high in reliability and low in cost.
Description
Technical field the utility model relates to the electric arc cutting technique, particularly relates to the plasma cutting technique field.
The existing general CUT of background technology must rely on the high-frequency and high-voltage cutting plasma arc that ignites.Because main transformer has high frequency when having leakage inductance and striking, so the electromagnetic radiation of cutting machine is very serious, has a strong impact on the quality of electrical network and related work personnel's physical and mental health.In addition, adopt the high-frequency and high-voltage striking, also can produce serious electromagnetic interference other electronic devices and components of periphery.Therefore, the use of the CUT that adopts the high-frequency and high-voltage striking is very restricted, is not useable for environment and automation cutting field the electromagnetic interference sensitivity.Cut the plasma arc control method, can effectively solve the problems of the technologies described above and utilize non-high frequency to ignite.
The leading arc control technology that adopts non-high frequency is that the moment arc transfer of utilizing that electrode separates with nozzle realizes to workpiece.Its control air-flow and electric current are converted to non-short-circuit condition with electrode and nozzle by short-circuit condition, and forming little arc between electrode and the nozzle is leading arc; When nozzle forms the cutting minor arc during near workpiece again.Disclose a kind of CUT double-airflow non-high-frequency arc strike control device that is used for as Chinese patent CN101259564A, the big or small air valve of air-flow control utilization state in parallel is controlled the timesharing air-flow of burning torch, utilizes IGBT chopper control electric current.This technology has the following disadvantages:
Aspect air-flow control, Chinese patent CN101259564A adopts the air valve of two parallel connections, and this can only control gas flow, can't regulate the endotracheal air pressure of cutting gun.As long as gas input cutting gun is arranged, just have air pressure in the cutting gun, even if when cutting finishes, still there is a certain amount of gas to exist in the cutting gun, this is because cutting gun is very long, gas is got rid of automatically in cutting gun and is needed the regular hour.Like this, the electrode of air pressure meeting jack-up cutting gun makes it and can't contact with nozzle in the cutting gun.Must contact with nozzle and be in short-circuit condition and the necessary condition of the starting the arc is an electrode, this requires there is not gas in the cutting gun.So Chinese patent CN101259564A is unfavorable for the starting the arc at any time.When cutting finished, electrode and nozzle still were in the condition of high temperature.Prior art adopts little airflow cooling electrode and nozzle, and cooling velocity is slow, has shortened the life-span of electrode and nozzle.
Current Control in the Chinese patent CN101259564A arc ignition control circuit adopts the IGBT chopper, realizes the control to electric current, the control circuit relative complex, and cost is higher.
The summary of the invention the technical problems to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part and proposes a kind of starting the arc again and inverter CUT with leading arc control device of cooling jet fast can realized at any time.
The utility model solve the technical problem can be by realizing by the following technical solutions:
Design, a kind of inverter CUT of use with leading arc control function, comprise cutting gun, air flow controller and current control device, described air flow controller comprises gas conditioner, electromagnetic intake valve and electromagnetic exhaust valve, described gas conditioner is connected with electromagnetic intake valve, and described air bleeding valve is arranged between described intake valve and the cutting gun.
Described current control device comprises pwm pulse width modulator, comparator and current detection circuit, the arcing current input comparator of the detected cutting gun of described current detection circuit and given current ratio, resulting comparison signal input pwm pulse width modulator is regulated output current.
Be electrically connected with resistance between the nozzle of described cutting gun and the main circuit.
Compare with prior art, technique effect of the present utility model is:
1, adopts the conducting of an intake valve control air-flow, adopt flow and the pressure of another air bleeding valve, realize the switching of minor arc and leading arcuation attitude with electronic switch by exhaust control gas.During leading arcuation attitude, two air valves act on simultaneously, and air bleeding valve is emitted a certain amount of gas, the input cutting gun be little airflow; During the minor arc state, exhaust valve closure, what import cutting gun is air flow; Again during the starting the arc, intake valve cuts out after the gas time-delay cooling, and air bleeding valve is discharged remaining gas in the cutting gun rapidly, no longer includes air pressure in the cutting gun, and electrode contacts with nozzle, can realize at any time the starting the arc again.
2, when cutting finished, electrode and nozzle still were in the condition of high temperature, and the utility model adopts air flow, and cooling jet has fast prolonged life-span of electrode and nozzle, has reduced production cost.
3, utilize adjusting and the control of the integrated pulse width controller realization of PWM to electric current, control circuit is simple, the reliability height, and cost is low.
Description of drawings
Fig. 1 is the circuit block diagram that the utlity model has the inverter CUT of leading arc control device;
Fig. 2 is gas control principle figure of the present utility model.
The specific embodiment is described in further detail below in conjunction with the preferred embodiment shown in the accompanying drawing.
As shown in Figure 1 and Figure 2, a kind of inverter CUT with leading arc control function, comprise cutting gun 1, air flow controller 2 and current control device, described air flow controller comprises gas conditioner 21, electromagnetic intake valve 22 and electromagnetic exhaust valve 23, described gas conditioner 21 is connected with electromagnetic intake valve 22, and described air bleeding valve 23 is arranged between described intake valve 22 and the cutting gun 1.
As shown in Figure 2, described current control device comprises pwm pulse width modulator 31, comparator 32, current detection circuit 33, electronic switch 34, minor arc decision circuitry 35, cutting current given circuit 36 and leading arc current given circuit 37.The arcing current input comparator 32 that described current detection circuit 33 detects cutting gun 1 and the given current ratio of described cutting current given circuit 36 or 37 outputs of leading arc current given circuit, resulting comparison signal input pwm pulse width modulator 31 is regulated output currents.Invert plasma cutter is by the integrated pulse width controller of PWM, and output can be regulated the square-wave pulse of dutycycle width, controls the ON time of electronic switch 34, realizes output current regulating.Dutycycle is that the comparison by the current feedback signal of the given signal of electric current and described current detection circuit output determines.The given signal of electric current is meant gives the leading arc current setting value of constant current regulating circuit 36 outputs or the cutting current setting value that leading arc is given constant current regulating circuit 37 outputs with cutting, control the switching and the input comparator 32 of electronic switches 34 by minor arc decision circuitry 35, thereby realize the automatic conversion between leading arc current and the cutting minor arc electric current.
Be electrically connected with resistance 4 between the nozzle 11 of described cutting gun 1 and the main circuit 5.
The course of work is specific as follows:
As shown in Figure 1 and Figure 2, cutting machine is connected power supply, and when pressing the cutting gun gauge tap, intake valve 22 and air bleeding valve 23 act on simultaneously, and the air-flow of input cutting gun is a little airflow; Owing to just begin electrode 12 and nozzle 11 is in short-circuit condition, electric current constitutes loops by wire resistor 4 and main circuit 5, because the metering function of resistance, the electric current of this moment is very little.And at this moment minor arc decision circuitry 35 is not worked, and what electronic switch 34 was transferred to comparator 32 is leading arc current signal.Under the effect of little airflow, electrode 12 and nozzle 11 are open, and form little electric arc between electrode 12 and the nozzle 11, promptly leading arc, and this stage is the striking stage.
When the nozzle 11 of cutting gun during near workpiece 6, electric current forms the loop by electric arc from workpiece, does not have the obstruction of wire resistor 4, it is big that electric current becomes, 35 work of minor arc decision circuitry, electronic switch 34 actions, given signal becomes the cutting current setting value by leading arc current setting value; The comparison of the current feedback signal by the output of the given signal of electric current and described current detection circuit, pwm pulse width modulator 31 is regulated dutycycles, regulates the cutting current of inverter output; This moment, air bleeding valve 23 was closed, and the air-flow of input cutting gun is an air flow, formed bigger electric arc between cutting gun 1 and the workpiece 6, promptly cut minor arc.
When cutting gun 1 leaves workpiece 6, minor arc decision circuitry 35 quits work, and cutting gun switches to little arc.When cutting gun during, cause minor arc automatically, once more cutting once more near workpiece; Close the gauge tap of cutting gun, little arc stops, exhaust valve closure, and intake valve postpones a period of time shutoff, with air flow cooling electrode and nozzle, closes intake valve at last.
The leading arc control technology of contravariant CUT mainly is made up of Pneumatic controller, current sensing means and PWM (pulse width modulator) integration module.Pneumatic controller is provided with air bleeding valve by the conducting of intake valve control air-flow between intake valve and cutting gun, in order to regulate the size of air-flow.By current sensing means required current signal is fed back to PWM, PWM realizes regulating the output current size by regulating dutycycle.The little electric current that striking is required is wire resistor of series connection between the positive pole of nozzle and power supply, and when connecting power supply, owing to be in short-circuit condition between the electrode of non-high frequency cutting gun and the nozzle, nozzle constitutes the loop by wire resistor and current sensing means.At this moment, import little airflow by Pneumatic controller to burning torch, air-flow separates electrode and short circuit between the nozzle, and making and forming electric arc between nozzle and the electrode is leading arc.Because the metering function of wire resistor, the Current Control of this moment is at about 13-18A, so electric arc is less.When nozzle when directly being connected the workpiece of positive source, wire resistor is by short circuit, electric current is bigger in the circuit, Pneumatic controller is imported air flow to burning torch, forming the bigger electric arc of energy between nozzle and the workpiece is minor arc.
Rational in infrastructure, the high efficiency of the utility model.Adopt the CUT of this striking mode, its arc process is to rely on air-flow to push non-short-circuit condition open by short-circuit condition between electrode and the nozzle, and forms electric arc by the steering circuit electric current between them, thereby forms leading arc (being little arc); When the nozzle of burning torch during near workpiece, form and workpiece between the cutting minor arc.Arc process all has accurate control to air-flow and striking electric current, finishes, when cutting gun leaves workpiece, can realize reducing output current and air-flow rapidly when cutting, and guarantee that leading arc does not extinguish (the smooth starting the arc of cutting next time energy).Thereby avoid principal current to form the loop by nozzle and current-limiting resistance, and scaling loss nozzle and current-limiting resistance.
Claims (3)
1. inverter CUT with leading arc control device, comprise cutting gun (1), air flow controller (2) and current control device, it is characterized in that: described air flow controller comprises gas conditioner (21), electromagnetic intake valve (22) and electromagnetic exhaust valve (23), described gas conditioner (21) is connected with electromagnetic intake valve (22), and described air bleeding valve (23) is arranged between described intake valve (22) and the cutting gun (1).
2. the inverter CUT with leading arc control device as claimed in claim 1, it is characterized in that: described current control device comprises pwm pulse width modulator (31), comparator (32) and current detection circuit (33), the arcing current input comparator (32) of the detected cutting gun of described current detection circuit (33) (1) and given current ratio, resulting comparison signal input pwm pulse width modulator (31) is regulated output current.
3. the inverter CUT with leading arc control device as claimed in claim 1 is characterized in that: be electrically connected with resistance (4) between the nozzle (11) of described cutting gun (1) and the main circuit (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202608548U CN201625832U (en) | 2009-11-23 | 2009-11-23 | Inverter plasma cutting machine with lead arc control device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202608548U CN201625832U (en) | 2009-11-23 | 2009-11-23 | Inverter plasma cutting machine with lead arc control device |
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| CN201625832U true CN201625832U (en) | 2010-11-10 |
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| CN2009202608548U Expired - Lifetime CN201625832U (en) | 2009-11-23 | 2009-11-23 | Inverter plasma cutting machine with lead arc control device |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102126075A (en) * | 2010-11-18 | 2011-07-20 | 上海沪工电焊机(集团)有限公司 | Leading arc circuit controlled by single tube IGBT |
| CN102350579A (en) * | 2011-04-11 | 2012-02-15 | 西安理工大学 | Arc interruption preventing cutting method of air plasma cutter for cutting grid-shaped metal |
| CN103433607A (en) * | 2013-08-12 | 2013-12-11 | 华中科技大学 | Digitalized plasma cutting machine control system |
| CN104969665A (en) * | 2012-12-04 | 2015-10-07 | 欧瑞康美科股份公司，沃伦 | Method and control device for operating a plasma generation device |
| CN104959720A (en) * | 2015-07-24 | 2015-10-07 | 上海沪工焊接集团股份有限公司 | Sequential control method for air plasma cutter |
| CN105618911A (en) * | 2015-11-20 | 2016-06-01 | 唐山松下产业机器有限公司 | Inverter plasma cutter and control method thereof at arc striking stage |
| CN105848398A (en) * | 2015-01-29 | 2016-08-10 | 卡尔伯格-基金会 | Plasma torch |
| CN107398623A (en) * | 2017-08-24 | 2017-11-28 | 共享铸钢有限公司 | A kind of gouge machine automatic control system |
| 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 |
| CN108296616A (en) * | 2017-12-29 | 2018-07-20 | 上海广为焊接设备有限公司 | Repeatable arc strike control device |
| CN111545883A (en) * | 2020-05-14 | 2020-08-18 | 上海气焊机厂有限公司 | Cutting machine control method and control device |
| 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 |
| CN112719543A (en) * | 2020-12-22 | 2021-04-30 | 无锡马斯克焊割设备有限公司 | Low-frequency arc-drawing type arc striking system applied to plasma cutting machine |
| CN115351403A (en) * | 2022-08-11 | 2022-11-18 | 成都华远电器设备有限公司 | Air plasma cutting gun and using method thereof |
-
2009
- 2009-11-23 CN CN2009202608548U patent/CN201625832U/en not_active Expired - Lifetime
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102126075A (en) * | 2010-11-18 | 2011-07-20 | 上海沪工电焊机(集团)有限公司 | Leading arc circuit controlled by single tube IGBT |
| CN102350579A (en) * | 2011-04-11 | 2012-02-15 | 西安理工大学 | Arc interruption preventing cutting method of air plasma cutter for cutting grid-shaped metal |
| CN104969665B (en) * | 2012-12-04 | 2018-04-13 | 欧瑞康美科股份公司，沃伦 | For running the method and control device of plasma generating device |
| CN104969665A (en) * | 2012-12-04 | 2015-10-07 | 欧瑞康美科股份公司，沃伦 | Method and control device for operating a plasma generation device |
| US9756713B2 (en) | 2012-12-04 | 2017-09-05 | Oerliken Metco Ag, Wohlen | Method and control unit for operating a plasma generation apparatus |
| CN103433607B (en) * | 2013-08-12 | 2016-01-13 | 华中科技大学 | A kind of digitlization CUT control system |
| CN103433607A (en) * | 2013-08-12 | 2013-12-11 | 华中科技大学 | Digitalized plasma cutting machine control system |
| CN105848398A (en) * | 2015-01-29 | 2016-08-10 | 卡尔伯格-基金会 | Plasma torch |
| CN104959720A (en) * | 2015-07-24 | 2015-10-07 | 上海沪工焊接集团股份有限公司 | Sequential control method for air plasma cutter |
| CN105618911A (en) * | 2015-11-20 | 2016-06-01 | 唐山松下产业机器有限公司 | Inverter plasma cutter and control method thereof at arc striking stage |
| CN107398623A (en) * | 2017-08-24 | 2017-11-28 | 共享铸钢有限公司 | A kind of gouge machine automatic control system |
| CN108296616A (en) * | 2017-12-29 | 2018-07-20 | 上海广为焊接设备有限公司 | Repeatable arc strike control device |
| CN108296616B (en) * | 2017-12-29 | 2020-05-15 | 上海广为焊接设备有限公司 | Repeatable arc striking control device |
| 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 |
| CN111545883A (en) * | 2020-05-14 | 2020-08-18 | 上海气焊机厂有限公司 | Cutting machine control method and control device |
| 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 |
| CN112719543A (en) * | 2020-12-22 | 2021-04-30 | 无锡马斯克焊割设备有限公司 | Low-frequency arc-drawing type arc striking system applied to plasma cutting machine |
| CN115351403A (en) * | 2022-08-11 | 2022-11-18 | 成都华远电器设备有限公司 | Air plasma cutting gun and using method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101110 |
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| CX01 | Expiry of patent term |