CN212599592U - Arc striking device of plasma cutting equipment - Google Patents
Arc striking device of plasma cutting equipment Download PDFInfo
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- CN212599592U CN212599592U CN202021010455.9U CN202021010455U CN212599592U CN 212599592 U CN212599592 U CN 212599592U CN 202021010455 U CN202021010455 U CN 202021010455U CN 212599592 U CN212599592 U CN 212599592U
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Abstract
The utility model discloses an arc striking device of plasma cutting equipment, which comprises a pressure relief type air valve, a control system, a cutting torch and a transfer arc switch, wherein the pressure relief type air valve is connected with the cutting torch through an air pipeline, working gas reaches the cutting torch through the pressure relief type air valve, the control system is connected with the pressure relief type air valve to control the action of the pressure relief type air valve, and the control system is electrically connected with the transfer arc switch; the utility model discloses used pressure release type pneumatic valve, through control system to the control of pressure release type pneumatic valve, the chronogenesis of cooperation plasma cutting equipment striking can effectively reduce the striking current of plasma cutting equipment when guaranteeing striking and transfer electric arc success rate, prolongs the life of cutting torch nozzle.
Description
Technical Field
The utility model relates to a processing equipment in welding cutting field especially relates to a plasma cutting arc striking device.
Background
In the plasma cutting machine industry, the arc striking device of the currently used plasma cutting equipment is usually provided with an arc transferring device, especially in the application of high-current plasma cutting. The transferred arc refers to an electric arc ignited between an electrode and a nozzle, and when a cutting torch approaches a workpiece, the electric arc is transferred between the electrode and the workpiece to burn.
The use of a transferred arc directly affects the life of the nozzle of the torch because the transferred arc burns and generates heat between the nozzle and the electrode of the torch. In the existing plasma cutting equipment, when arc transfer current is small, the service life of a nozzle is considered, but the success rate of arc transfer is not high; in order to ensure the success rate of electric arc transfer, the current setting of the transferred arc is larger, so that the influence of the current of the transferred arc on the service life of the nozzle is larger.
In addition, arc striking devices applied to plasma cutting equipment are high-frequency high-voltage arc striking, and high-frequency high-voltage arc striking has a high arc striking success rate technically, but serious electromagnetic interference caused by high frequency and high voltage cannot be avoided, so that the arc striking devices cannot be applied to occasions with strict electromagnetic interference requirements, such as the field of automatic numerical control cutting.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art, provide a plasma cutting equipment striking device that can reduce the striking current and improve nozzle life.
The utility model adopts the following technical scheme: the arc striking device of the plasma cutting equipment comprises a pressure relief type air valve, a control system, a cutting torch and a transferred arc switch, wherein the pressure relief type air valve is connected with the cutting torch through an air pipeline, working gas reaches the cutting torch through the pressure relief type air valve, the control system is connected with the pressure relief type air valve to control the action of the pressure relief type air valve, and the control system is electrically connected with the transferred arc switch.
Further, the cutting torch is a contact arc-striking cutting torch.
Before the working gas is input, the electrode and nozzle of cutting torch are released, and when the working gas arrives, the electrode is drawn back, and the electrode and nozzle are separated.
And the oil-water separator is connected with the pressure relief type air valve through an air pipeline, and the working gas reaches the pressure relief type air valve after passing through the oil-water separator.
Further, the control system is a single chip microcomputer system.
The single chip microcomputer system can comprise a 51 single chip microcomputer, an ARM single chip microcomputer, a PIC single chip microcomputer or other single chip microcomputers.
The system further comprises a transferred arc current detector and a working loop current detector, wherein the transferred arc current detector and the working loop current detector are respectively electrically conducted with the control system, and the transferred arc current detector and the working loop current detector respectively feed detected current signals back to the control system.
The transferred arc current detector and the working loop current detector can be various sensors or sensing circuits for detecting current, and specifically can be hall sensors or current transformer current.
Further, the transferred arc switch comprises an IGBT.
Further, the transferred arc current detector is a hall current sensor, and the work loop current detector is a hall current sensor.
The utility model has the advantages that: the utility model discloses used pressure release type pneumatic valve, through control system to the control of pressure release type pneumatic valve, the chronogenesis of cooperation plasma cutting equipment striking can effectively reduce the striking current of plasma cutting equipment when guaranteeing striking and transfer electric arc success rate, prolongs the life of cutting torch nozzle.
Furthermore, the contact arc-striking type cutting torch is used for striking an arc through a contact short circuit, so that the high reliability of striking the arc is ensured, and meanwhile, the electromagnetic pollution of high-frequency high-voltage striking can be avoided.
Furthermore, the oil-water separator can effectively remove impurities such as oil and water in the working gas, ensure the purity of the gas and improve the cutting quality.
Furthermore, the single chip microcomputer is widely applied to various fields, is easy to obtain, and has low cost and good reliability.
Furthermore, the transferred arc current detector and the working loop current detector can monitor the transferred arc current and the working loop current in real time, provide feedback signals for the control system, facilitate the control system to improve the adaptability of dynamic adjustment, and improve the use comfort of the equipment.
Furthermore, the IGBT has the characteristics of low power consumption, quick response and high reliability, the use of the IGBT has the characteristics of good reliability and environmental protection, and the IGBT has higher withstand voltage allowance.
Furthermore, the hall current sensor is widely used, and has the characteristics of easy acquisition, low cost and good reliability.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a timing diagram of a particular application of the control system of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an embodiment of an arc striking device of a plasma cutting apparatus according to the present invention. As shown in fig. 1, the embodiment includes a pressure relief type gas valve 1, a control system 2, a cutting torch 3 and a transferred arc switch 4, wherein the pressure relief type gas valve 1 is connected with the cutting torch 3 through a gas pipeline, a working gas reaches the cutting torch 3 through the pressure relief type gas valve 1, the control system 2 is connected with the pressure relief type gas valve 1 to control the action of the pressure relief type gas valve 1, and the control system 2 is electrically connected with the transferred arc switch 4.
The embodiment can be applied to plasma cutting equipment. As shown in fig. 1, when an operator presses a cutting torch switch, a control system 2 starts to respond, the control system 2 outputs a signal and drives a pressure relief type gas valve 1 to open a pressure relief valve for pressure relief, at this time, a part of working gas passing through the pressure relief type gas valve 1 is shunted to the outer side of a pipeline through the pressure relief valve, and the pressure of the working gas in the pipeline is reduced; after the pressure relief type gas valve 1 opens the pressure relief valve, the control system 2 controls the transfer arc switch 4 to be conducted, so that electric arcs are generated between the electrode and the nozzle in the cutting torch 3, and the working gas is ionized under the action of the electric arcs to form plasma arcs.
In a specific embodiment, the arc generated by the electrode and the nozzle in the torch 3 may be conventional non-contact arc starting or contact arc starting. Conventional non-contact arcing employs a high frequency and high voltage to generate an arc between an electrode and a nozzle.
When the gas cutting torch is used, the switch of the cutting torch 3 is pressed, the pressure relief type gas valve 1 is opened, the pressure of working gas is reduced, the arcing voltage of the cutting torch 3 is reduced, and the arcing current is reduced. The arc starting voltage and current are reduced, the influence of the transferred arc on the nozzle of the cutting torch 3 is reduced, and the service life of the nozzle is prolonged.
Further, as a specific embodiment, the torch is 3-position contact with an arc-start torch. The contact arc-striking cutting torch means that an electrode and a nozzle of the cutting torch are released to generate an electric arc, and the electrode and the nozzle of the cutting torch are separated after the electric arc is generated to form an electric arc with a certain length.
In a specific embodiment, the contact arc type cutting torch contacts an electrode of the cutting torch 3 with a nozzle before working gas is introduced, the transfer arc switch 4 is switched on at the moment that the cutting torch 3 is introduced with the working gas, the electrode and the nozzle are short-circuited to form current, the electrode is drawn back under the action of the working gas pressure, a gap is formed between the electrode and the nozzle, and a stable plasma arc is formed between the electrode and the nozzle.
Fig. 2 is a timing chart of the present embodiment applied to a contact arc type plasma cutting apparatus. As shown in fig. 2, in the present embodiment, when the application is performed, the application is divided into five stages, which are a preparation stage, an arc striking process, an arc maintenance process, a cutting process, and an end stage, respectively, and the control system 2 outputs a corresponding control model according to a corresponding time sequence.
In the preparation stage, before the arc striking process, working gas begins to supply gas to the plasma cutting equipment, and the pressure of the working gas can be 0.5 MPa; when a switch of a cutting torch 3 is pressed, an arc striking process starts, a control system 2 firstly closes a transfer arc switch 4, meanwhile, a signal is provided for a pressure relief type air valve 1, the pressure relief type air valve 1 reduces air pressure of an air passage through a pressure relief valve in a short time, and as a specific implementation mode, the time for opening the pressure relief valve by the pressure relief type air valve 1 is in the millisecond level, and can be dozens of milliseconds; at this time, the electrode of the cutting torch 3 and the nozzle are kept in a closed state, and simultaneously the system control 2 outputs a signal, the plasma cutting equipment outputs a transferred arc current, and a short circuit current is formed on the electrode and the nozzle. When the pressure of the electrode in the cutting torch 3 and the nozzle is restored to a set value, the electrode of the cutting torch 3 is pumped back under the action of the working gas, and a gap is formed between the electrode and the nozzle. Specifically, the gas pressure required for separating the electrode from the nozzle may be set to about 0.3 MPa; at the moment, due to the separation of the electrode and the nozzle, the voltage output by the plasma cutting equipment is increased, and particularly, when the cutting torch 3 is short-circuited and arcing occurs, the output voltage of the plasma cutting equipment is less than 10V; after the electrode is separated from the nozzle, the output voltage of the plasma cutting device is increased, specifically, 130V, and at this time, the output voltage of the plasma cutting device is far less than the set inflection point voltage. And if the output voltage is less than the inflection point voltage, the output current of the plasma cutting equipment does not change greatly and is in a constant current section of the plasma equipment with a steep drop characteristic.
After arc striking between the electrode and the nozzle, the maintenance process is carried out, and the transferred arc current has good dynamic allowance in the process because the output voltage of the plasma cutting equipment is lower than the set inflection point voltage. In this case, even if the arc voltage of the transferred arc changes due to the pressure fluctuation of the working gas, specifically, the amount of withdrawal of the electrode can be changed due to the pressure fluctuation of the working gas, and the constant current output can be maintained.
The cutting torch 3 approaches the workpiece, and at the moment, a loop is formed between the electrode and the workpiece, and the electric arc is transferred to the workpiece. At the beginning, the arc between the electrode and the nozzle is transferred and shunted to the space between the electrode and the workpiece, so that the transferred arc current is reduced; as the arc is transferred from between the electrode and the nozzle to between the electrode and the workpiece, the arc length becomes longer, the arc voltage rises, and the output voltage rises. Because the output voltage is far lower than the set inflection point voltage, the stable output of the equipment current can be ensured, and the conditions of arc breaking and arc extinguishing can not be generated. And then, a stable electric arc is established between the electrode and the workpiece to form current, the control system 2 outputs a signal to improve the transferred arc current, and simultaneously, the transferred arc switch is closed. After the transferred arc switch is switched off, the control system 3 regulates the output current to the preset cutting current, at the moment, the output current completely flows from the electrode to the workpiece to form a passage, and the nozzle does not form the passage any more, so that the transition from the transferred arc current to the main arc current is realized, the normal cutting is started, and the cutting process is started.
After cutting, the switch of the cutting torch 3 is loosened, the control system 2 outputs signals, the plasma arc is extinguished, meanwhile, the output voltage and the output current of the plasma cutting equipment return to zero, the pressure relief type air valve 1 continues to supply air to the cutting torch 3 and delays to stop supplying air, and then the electrode and the nozzle are closed again.
When the method is specifically applied, the maintenance current of the transferred arc can be reduced to 10-15A, compared with the maintenance current of 20-30A of common plasma cutting equipment, the method can reduce the maintenance current by 50%, and meanwhile, the successful transfer of the arc is guaranteed; and the knee voltage of the equipment can reach more than 200V, so that the stability of the output current of the equipment is ensured, the success rate of arc transfer is further ensured, and as a specific implementation mode, the knee voltage is set to be 200V.
In a specific embodiment, the transferred arc switch 4 comprises an IGBT, and the IGBT used as a switch has a higher withstand voltage margin, and the transferred arc switch has a longer service life than a conventional contactor after being added with a radiator.
Further, the present embodiment further includes an oil-water separator 5. The oil-water separator 5 is arranged in front of the pressure relief type air valve 1, and the working gas reaches the pressure relief type air valve 1 after passing through the oil-water separator 5.
As a specific implementation manner, pressurization of working gas of plasma cutting equipment by a gas pressurization device is a conventional means, and when the gas passes through the pressurization device, the gas is often influenced by machine equipment and mixed with oil gas and water vapor impurities, so that the gas quality is reduced, and the plasma cutting quality is further influenced. Oil gas, steam impurity in the working gas can be gone out in setting up of oil water separator 5, improves the working gas purity, guarantees the quality of plasma cutting.
Further, the control system 2 of the present embodiment is a single chip microcomputer system. The specific singlechip can be a 51 singlechip, an ARM singlechip, a PIC singlechip or other singlechips.
As a specific implementation manner, the single chip microcomputer is widely used in equipment manufacturing industry, and the single chip microcomputer system not only can be programmed as required, but also has the advantages of reliability, easily available elements, low cost and the like.
Further, the arc transfer circuit control system further comprises a transfer arc current detector 6 and a work loop current detector 7, the control system 2 is electrically conducted with the transfer arc current detector 6 and the work loop current detector 7 respectively, and the control system 2 directly or indirectly receives and adjusts current detection signals detected and sent by the transfer arc current detector 6 and the work loop current detector 7.
In a specific embodiment, the transferred arc current detector 6 is a hall current sensor, and the work loop current detector 7 is a hall current sensor. The transferred arc current detector 6 is used for sampling a plasma arc current signal and transmitting the plasma arc current signal to the control system 2, and detection work is carried out after arc ignition and before the arc is completely transferred to a workpiece. The work-loop current detector 7 performs sampling work after the arc is completely transferred to the workpiece.
Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a plasma cutting equipment arc ignition device, its characterized in that, including pressure release type pneumatic valve (1), control system (2), cutting torch (3) and transfer arc switch (4), pressure release type pneumatic valve (1) passes through the gas piping connection with cutting torch (3), and working gas reaches cutting torch (3) through pressure release type pneumatic valve (1), and control system (2) are connected with pressure release type pneumatic valve (1) and control pressure release type pneumatic valve (1) action, and control system (2) and transfer arc switch (4) electrical connection.
2. The arc ignition device of a plasma cutting apparatus according to claim 1, characterized in that the cutting torch (3) is a contact arc type cutting torch.
3. The arc striking device of the plasma cutting equipment according to claim 1 or 2, further comprising an oil-water separator (5), wherein the oil-water separator (5) is connected with the pressure relief type gas valve (1) through a gas pipeline, and the working gas reaches the pressure relief type gas valve (1) after passing through the oil-water separator (5).
4. The arc ignition device of plasma cutting equipment according to claim 3, characterized in that the control system (2) is a single chip microcomputer system.
5. The arc ignition device of the plasma cutting equipment according to claim 3, characterized by further comprising a transferred arc current detector (6) and a working loop current detector (7), wherein the transferred arc current detector (6) and the working loop current detector (7) are respectively electrically conducted with the control system, and the transferred arc current detector (6) and the working loop current detector (7) respectively feed back the detected current signals to the control system (2).
6. The plasma cutting apparatus arc ignition device according to claim 3, characterized in that the transferred arc switch (4) comprises an IGBT.
7. The arc ignition device of a plasma cutting apparatus according to claim 5, characterized in that the transferred arc current detector (6) is a Hall current sensor and the work loop current detector (7) is a Hall current sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021010455.9U CN212599592U (en) | 2020-06-04 | 2020-06-04 | Arc striking device of plasma cutting equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021010455.9U CN212599592U (en) | 2020-06-04 | 2020-06-04 | Arc striking device of plasma cutting equipment |
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| CN212599592U true CN212599592U (en) | 2021-02-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115255582A (en) * | 2022-08-02 | 2022-11-01 | 友力机电有限公司 | Inverter type direct-current plasma double-air-valve cutting machine and control circuit |
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2020
- 2020-06-04 CN CN202021010455.9U patent/CN212599592U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115255582A (en) * | 2022-08-02 | 2022-11-01 | 友力机电有限公司 | Inverter type direct-current plasma double-air-valve cutting machine and control circuit |
| CN115255582B (en) * | 2022-08-02 | 2023-12-08 | 友力机电有限公司 | Inverter type direct-current plasma double-air-valve cutting machine and control circuit |
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