CN221415322U - Auxiliary superposition arc striking circuit for plasma cutting torch - Google Patents
Auxiliary superposition arc striking circuit for plasma cutting torch Download PDFInfo
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- CN221415322U CN221415322U CN202322879505.7U CN202322879505U CN221415322U CN 221415322 U CN221415322 U CN 221415322U CN 202322879505 U CN202322879505 U CN 202322879505U CN 221415322 U CN221415322 U CN 221415322U
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- 238000005520 cutting process Methods 0.000 title claims abstract description 68
- 238000012544 monitoring process Methods 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 14
- 238000010891 electric arc Methods 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000005684 electric field Effects 0.000 claims description 4
- 230000000977 initiatory effect Effects 0.000 claims 7
- 238000003466 welding Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
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- 238000010276 construction Methods 0.000 description 2
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- 238000002955 isolation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
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- 239000012141 concentrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 238000002844 melting Methods 0.000 description 1
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- 239000007769 metal material Substances 0.000 description 1
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Abstract
The utility model relates to the technical field of plasma cutting torch welding and cutting, in particular to an auxiliary superposition arc striking circuit for a plasma cutting torch, which comprises the following components: the controller is used for monitoring and adjusting the current and the voltage in the arc striking circuit; the rectification circuit is controlled by the controller and is used for converting alternating current into direct current; and the inverter circuit is controlled by the controller, coupled with the rectifying circuit and used for converting direct current into alternating current. The utility model has the effect of improving the stability of the output current of the arc striking circuit so as to ensure the accuracy of the welding and cutting process.
Description
Technical Field
The application relates to the technical field of plasma cutting torch welding and cutting, in particular to an auxiliary superposition arc striking circuit for a plasma cutting torch.
Background
The plasma cutting technology is a technology for cutting a material using high temperature plasma, which is to cut and process the material by generating high temperature plasma by arc discharge, heating and melting the material using high energy and high temperature of the plasma, and then blowing the melted material away by gas injection. The plasma cutting has the advantages of high cutting speed and high precision, is suitable for cutting metal materials, and meanwhile, the plasma cutting technology can also be used for cutting complex shapes such as multi-axis cutting, three-dimensional cutting and the like, and is widely applied to various fields such as metal processing, construction, automobile construction, aerospace and the like.
In the plasma cutting process, a plasma cutting torch is a front end metal cutting piece generating an arc, and the plasma cutting torch is a special flame nozzle generating a high-temperature plasma arc between an electrode and a workpiece and maintaining the plasma arc required in the cutting process. The plasma torch needs to be connected to an arc striking circuit by a cable to generate an arc.
The arc striking circuit can provide required current and voltage in the cutting process, ensures that an electric arc can stably work, is an important component of a plasma cutting torch system, and ensures cutting quality and efficiency. However, the technical personnel have low requirements on the arc striking circuit, and the arc striking circuit only can generate an electric arc, so that the traditional arc striking circuit is mainly low in cost in design.
Based on this, traditional striking circuit only is as a subordinate circuit of control circuit when the design, and the electric current of plasma arc is influenced by former control circuit electric current variation, and the accuracy is not high, and the improvement of present science and technology level is very high to the accuracy requirement of metal manufacturing industry gradually, and traditional striking circuit's accuracy is difficult to satisfy market demand.
Aiming at the related technology, the traditional arc striking circuit is improved to be independent of the main control circuit, so that the stability of the output current of the arc striking circuit is improved, and the accuracy of a welding and cutting process is ensured.
Disclosure of utility model
In order to improve the stability of the output current of the arc striking circuit and ensure the accuracy of a welding and cutting process, the utility model provides an auxiliary superposition arc striking circuit for a plasma cutting torch.
The utility model provides an auxiliary superposition arc striking circuit for a plasma cutting torch, which adopts the following technical scheme:
An auxiliary superimposed arc striking circuit for a plasma torch, comprising;
The controller is used for monitoring and adjusting the current and the voltage in the arc striking circuit;
The rectification circuit is controlled by the controller and is used for converting alternating current into direct current;
and the inverter circuit is controlled by the controller, coupled with the rectifying circuit and used for converting direct current into alternating current.
By adopting the technical scheme, compared with the traditional arc striking circuit, the arc striking circuit is independent of the main control circuit, and the controller is connected with the control terminal, so that the terminal management component can detect the current stability condition of the arc striking circuit in the automatic production line in real time, and technicians can control the current and the voltage in the arc striking circuit through the terminal management component, thereby providing convenience for welding and cutting production of welding and cutting parts; the inverter circuit is arranged in the scheme and is communicated with the high-voltage direct-current power supply at the front end, and the high-voltage direct-current power supply at the front end converts high-voltage direct-current into high-frequency alternating current through filtering, so that arcing is realized, the inverter circuit has the characteristic of small interference compared with the traditional high-voltage arcing, and the plasma arc stability in the production welding and cutting process is improved from the angle of arc generation; based on the arcing effect of the inverter circuit, the rectifier circuit is coupled, the rectification effect of the rectifier circuit is utilized to convert an alternating current power supply into a direct current power supply, stable current is provided for the arcing circuit to use, the inverter circuit and the rectifier circuit are coupled and operate simultaneously in the scheme, are respectively responsible for arcing and rectifying output, and are controlled by the controller to form an independent stable arcing circuit separated from the main control circuit, so that the main control circuit is prevented from interfering the arcing circuit, and the stability of electric arc and the welding and cutting accuracy in the plasma welding and cutting process are improved.
Optionally, the rectifying circuit consists of a rectifying bridge and magnetic rings arranged on the bridge arms;
And the direct current rectified by the rectifier bridge flows through the magnetic ring to store electric energy so as to stabilize direct current output.
By adopting the technical scheme, the rectifier bridge has the advantages that the alternating current used for arcing at the front end is rectified into direct current, but the direct current has pulsation phenomenon in the rectifying output process of the rectifier bridge and is unstable, and the magnetic ring is additionally arranged in a form of storing electric energy and releasing electric energy, so that the pulsation of the direct current is reduced, the direct current is more stable, and the stability and the reliability of the arcing process are further ensured.
Optionally, the inverter circuit is connected in series between the rectifying circuit and a power supply, and further includes;
The main transformer, the inverter circuit and the rectifying circuit are coupled through the main transformer, and the number of turns at one end of the rectifying circuit of the main transformer is smaller than that at one end of the inverter circuit.
Through adopting above-mentioned technical scheme, main transformer is arranged in stepping down, because in the inverter circuit of front end, the alternating current electrical frequency and the voltage that are used for the striking are too high, need reduce rectifier circuit input's alternating voltage to the voltage range who is fit for rectifier work through the transformer, reduce rectifier circuit's power loss and heat production, improve rectifier circuit's efficiency and reliability, in addition, the transformer can also provide electrical apparatus isolation, prevent high voltage and high current alternating current direct transfer to rectifier and other circuits in, protection front end welding and cutting equipment and personnel's safety, reduce the influence of grid voltage fluctuation to rectifier circuit.
Optionally, the output end of the rectifying circuit is coupled with the inverter circuit through the main transformer, the output end of the rectifying circuit is directly connected with the metal cutting piece, and correspondingly, the tail end of the rectifying circuit is provided with a magnetic ring.
Through adopting above-mentioned technical scheme, the main transformer realizes the circuit reposition of redundant personnel through the bleeder to inverter circuit output voltage, and inverter circuit most output voltage supplies rectifier circuit, outputs to plasma cutting torch end and forms electric arc, and the output of rectifier circuit is given to the little output, and the integration through rectifier circuit directly links the metal cutting part, makes metal cutting part surface switch on, makes electric arc stably exist between metal cutting part and plasma cutting torch.
Optionally, the inverter circuit is coupled to a plurality of rectifier bridges at different bridge arm contacts.
By adopting the technical scheme, the method aims at providing the current characteristics suitable for the operation of the cutting torch, only one rectifier bridge is used, the unbalance of the current among different branches of the rectifier bridge leads to unstable arc or unbalanced arc load, and a plurality of rectifier bridges can uniformly distribute the current into each bridge circuit, so that better current balance is realized, and the stability and the load balance of the arc are improved; in addition, the dispersion of rectifier bridge current can make the heat that produces among a plurality of rectification processes disperse to different bridge circuits, lightens the heat dissipation burden of single rectifier bridge, improves holistic heat dispersion, prevents the trouble and the damage that overheat causes.
Optionally, an inductor is connected in series with the front end part of the coupling point of each rectifier bridge and the inverter circuit.
By adopting the technical scheme, the inductor can inhibit high-frequency noise of current and protect the rectifier bridge, in the inversion current, high-frequency noise is generated along with the rapid and switching and change of the current, a stable direct-current power supply needs to be provided for a subsequent rectifier circuit, and the inductor is arranged at a coupling point to prevent the high-frequency noise from affecting the output stability of the direct-current power supply, so that the filter effect is achieved, the propagation of the high-frequency noise is inhibited, and the rectifier circuit obtains a more stable direct-current power supply; the alternating current power supply in the inverter circuit can generate higher voltage and current peaks in the switching process, damage is caused to elements in the rectifier bridge, the change speed of current is limited by arranging an inductor at a coupling point, the rising and falling speeds of the voltage and the current are simplified, and the rectifier bridge at the rear end part is protected from over-high voltage and current impact.
Optionally, further comprising;
the oscillating circuit is connected in parallel with the rear end of the arc striking resistor and is directly connected with a nozzle of the plasma cutting torch, and an electric arc is stabilized by generating an alternating electric field of a high-frequency oscillating signal;
The oscillating circuit is connected with a direct current power supply.
By adopting the technical scheme, since the oscillating circuit is generally composed of the inductor and the capacitor, when the capacitor and the inductor in the circuit are charged and discharged, alternating current and alternating voltage can be generated, an alternating electric field is formed at the front end nozzle of the plasma cutting torch, and the stability of an electric arc generated by the plasma cutting torch is maintained; based on the above, the inverter circuit and the rectifier circuit of the plasma cutting torch are connected at the front end as main arc striking circuits, and the direct current circuit and the oscillator circuit of the plasma cutting torch are arc maintaining circuits, which are overlapped to form a stable arc striking circuit.
Optionally, further comprising;
The arc striking resistor consists of a plurality of fixed resistors which are connected in series and is used for limiting output current.
By adopting the technical scheme, the arc striking resistor plays a role in limiting output current and prevents the output direct current from damaging the nozzle welded at the front end.
The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is an overall circuit diagram of an arc striking circuit in an embodiment of the application.
Fig. 2 is a circuit diagram of a main circuit and an auxiliary circuit constituting an arc striking circuit in the present embodiment.
Fig. 3 is a circuit diagram of a superimposed circuit constituting an arc striking circuit in the present embodiment.
Reference numerals illustrate: 1. a main circuit; 11. an inverter circuit; 12. a rectifying main circuit; 13. a rectification auxiliary circuit; 2. a superimposing circuit; 21. an oscillating circuit; 3. an auxiliary circuit.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Referring to fig. 1, an auxiliary superimposed arc striking circuit for a plasma torch includes a main circuit 1, an auxiliary circuit 3, and a superimposed circuit 2, the main circuit 1 being connected to a main body of the plasma torch by a cable for striking an arc; the superposition circuit 2 is connected with a nozzle of the plasma cutting torch through a cable and is used for maintaining an arc; the auxiliary circuit 3 is used as a branch of the main circuit 1 and is connected with the metal cutting piece for electrifying the metal cutting piece to form a complete current path so as to further maintain the stability of the electric arc; the front end of the arc striking circuit is provided with a high-voltage direct-current power supply (not shown in the figure) for supplying power to the whole arc striking circuit.
Referring to fig. 1 and 2, the main circuit 1 is composed of an inverter circuit 11 and a rectifying main circuit 121, in this embodiment, the inverter circuit 11 is a common bridge inverter circuit 11, and is composed of four transistor switching devices connected with a high-voltage dc power supply at the front end, and different inversion modes are realized by controlling the switching states of the four switches, so that the high-voltage dc current is changed into a high-frequency ac current, so in this embodiment, the inverter circuit 11 is used as an ac circuit for high-frequency arcing.
Referring to fig. 1 and 2, an inverter circuit 11 is provided with a rectifying main circuit 121 at the rear end direction of the current flow direction, and the output end of the rectifying main circuit 121 is connected with a plasma cutting torch through a cable; the rectifying main circuit 121 is composed of a rectifying bridge and a magnetic ring arranged on each rectifying bridge arm, and the rectifying main circuit 121 rectifies the alternating current output current of the front-end inverter circuit 11 into direct current to provide continuous energy supply in the plasma arc cutting process and maintain continuous operation of the arc. In order to avoid the pulse affecting the stable output of direct current, a magnetic ring is arranged for buffering, and the pulsation is reduced in a mode of storing electric energy and releasing electric energy, so that the output of direct current is more stable.
Referring to fig. 1 and 2, since the ac voltage in the inverter circuit 11 is too high and exceeds the voltage range suitable for rectification of the rectifying main circuit 121, the present embodiment provides a main transformer between the inverter circuit 11 and the rectifying main circuit 121 for reducing the voltage drop between the inverter circuit 11 and the rectifying main circuit 121, relieving the operating pressure of each rectifier in the rectifying main circuit 121, and reducing the power loss and heat generation in the rectifying main circuit 121. In addition, the transformer can provide electrical isolation, preventing high voltage, high current alternating current from being directly transferred into the rectifying main circuit 121 to damage the rectifier.
Referring to fig. 1 and 2, the main circuit 1 additionally includes a rectifying auxiliary circuit 13 on the other bridge arm of the inverter circuit 11, and the rectifying auxiliary circuit 13 adopts a conventional rectifying bridge composed of four diodes. Correspondingly, an inductor is connected in series with the front end of the rectifying auxiliary circuit 13. The inverter circuit 11 is coupled with a rectifying auxiliary circuit 13 at the bridge arm branch outside the coupling rectifying main circuit 121, so that high-voltage alternating current is uniformly distributed, better current balance is realized, and the stability of an arc and the uniformity of a load are improved.
It should be noted that, in the embodiment of the present application, an inductor is additionally connected in series to the front end of the auxiliary rectifying circuit 13, in order to reduce the cost, the auxiliary rectifying circuit 13 is used as the auxiliary rectifying circuit 3, and the scale of the auxiliary rectifying circuit is smaller than that of the main rectifying circuit 121, based on which the magnetic ring for maintaining stability on each bridge arm of the main rectifying circuit 121 is changed to be an inductor disposed at the front end of the whole auxiliary rectifying circuit 13.
Referring to fig. 1 and 2, in a main circuit 1 according to an embodiment of the present application, an auxiliary circuit 3 is separately provided, and the auxiliary circuit 3 is disposed at the same end of a rectifying main circuit 121, and is coupled to an inverter circuit 11 through a main transformer; the auxiliary circuit 3 is connected with the current flow of the rectifying main circuit 121 to the rear end, namely the output end, and the auxiliary circuit 3 is directly connected with the metal cutting piece. The auxiliary circuit 3 in this embodiment is directly connected to the metal cutting member, and corresponds to the communication of the rectifying main circuit 121 with the plasma cutting torch, so that a complete current loop is formed between the plasma cutting torch end and the metal cutting member while the plasma arc process is performed, thereby ensuring and further stabilizing the maintenance of the arc.
Referring to fig. 1 and 3, a superposition circuit 2 is connected in parallel with the whole main circuit 1, the superposition circuit 2 is communicated with a high-voltage direct-current power supply at the front end of an arc striking circuit, and the output end of the superposition circuit 2 is communicated with a nozzle of a plasma cutting torch; the superposition circuit 2 comprises an arc striking resistor and an oscillating circuit 21 which are arranged at the rear end of the current flow, wherein the arc striking resistor consists of a plurality of fixed resistors which are connected in series and is used for limiting high-voltage current, so that the oscillating circuit 21 behind the damage caused by overlarge current is avoided, and the cutting work of the plasma cutting torch nozzle is influenced.
In this embodiment, the oscillating circuit 21 is a common RLC oscillating circuit 21 for generating a high-frequency oscillating signal, so as to form an alternating electric field between the nozzle of the plasma torch and the metal cutting member, thereby forming a stable arc.
Referring back to fig. 1, in this embodiment, a controller is disposed between the rectifying main circuit 121 and the plasma cutting torch, and the controller generally adopts a single-chip microcomputer, and in consideration of the complexity of the arc striking circuit and the control of a technician on the circuit, the embodiment concentrates on the single-chip microcomputer to adopt an ARM Cortex-M series single-chip microcomputer. In practical application, the required performance, peripheral interfaces, cost and other factors should be determined according to the requirement of the arc striking circuit, for example, a PIC singlechip can be used for controlling the arc striking circuit with medium complexity; the simpler arc striking circuit control can adopt an AVR singlechip.
To sum up, in this embodiment, the main circuit 1 connected to the main body of the plasma cutting torch and the superposition circuit 2 connected to the nozzle of the plasma cutting torch are used to cooperate, so that stable operation of the arc is maintained on the basis of generating the arc, and the singlechip is provided as the main control, so that the arc striking circuit independent of the main control circuit can complete the processes of control, arcing, maintenance and the like.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (8)
1. An auxiliary superposition arc striking circuit for a plasma cutting torch is characterized in that: comprises the following steps of;
The controller is used for monitoring and adjusting the current and the voltage in the arc striking circuit;
The rectification circuit is controlled by the controller and is used for converting alternating current into direct current;
And the inverter circuit (11) is controlled by the controller, is coupled with the rectifying circuit and is used for converting direct current into alternating current.
2. The auxiliary superimposed arc initiation circuit for a plasma torch of claim 1, wherein: the rectifying circuit consists of a rectifying bridge and magnetic rings arranged on the bridge arms;
And the direct current rectified by the rectifier bridge flows through the magnetic ring to store electric energy so as to stabilize direct current output.
3. The auxiliary overlap arc initiation circuit for a plasma torch of claim 1, further comprising:
The main transformer, the inverter circuit (11) is coupled with the rectifying circuit through the main transformer, and the number of turns at one end of the rectifying circuit of the main transformer is smaller than that at one end of the inverter circuit (11);
The inverter circuit (11) is connected in series between the rectifier circuit and the power supply.
4. An auxiliary superimposed arc initiation circuit for a plasma torch as claimed in claim 3, wherein: the output end of the rectifying circuit is coupled with the inverter circuit (11) through the main transformer, the output end of the rectifying circuit is directly connected with the metal cutting piece, and correspondingly, the tail end of the rectifying circuit is provided with a magnetic ring.
5. The auxiliary superimposed arc initiation circuit for a plasma torch of claim 1, wherein: the inverter circuit (11) is coupled to a plurality of rectifier bridges at different bridge arm contacts.
6. The auxiliary overlap arc initiation circuit for a plasma torch of claim 5, wherein: an inductor is connected in series with the front end part of the coupling point of each rectifier bridge and the inverter circuit (11).
7. The auxiliary superimposed arc initiation circuit for a plasma torch of claim 1, wherein: also comprises;
The oscillating circuit (21) is connected in parallel with the rear end of the arc striking resistor and is directly connected with a nozzle of the plasma cutting torch, and an electric arc is stabilized by generating an alternating electric field of a high-frequency oscillating signal;
the oscillating circuit (21) is connected with a direct current power supply.
8. The auxiliary superimposed arc initiation circuit for a plasma torch of claim 1, wherein: also comprises;
The arc striking resistor consists of a plurality of fixed resistors which are connected in series and is used for limiting output current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322879505.7U CN221415322U (en) | 2023-10-25 | 2023-10-25 | Auxiliary superposition arc striking circuit for plasma cutting torch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322879505.7U CN221415322U (en) | 2023-10-25 | 2023-10-25 | Auxiliary superposition arc striking circuit for plasma cutting torch |
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| Publication Number | Publication Date |
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| CN221415322U true CN221415322U (en) | 2024-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322879505.7U Active CN221415322U (en) | 2023-10-25 | 2023-10-25 | Auxiliary superposition arc striking circuit for plasma cutting torch |
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| CN (1) | CN221415322U (en) |
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2023
- 2023-10-25 CN CN202322879505.7U patent/CN221415322U/en active Active
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