CN106513957A - Air plasma cutter - Google Patents
Air plasma cutter Download PDFInfo
- Publication number
- CN106513957A CN106513957A CN201611245676.2A CN201611245676A CN106513957A CN 106513957 A CN106513957 A CN 106513957A CN 201611245676 A CN201611245676 A CN 201611245676A CN 106513957 A CN106513957 A CN 106513957A
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- CN
- China
- Prior art keywords
- electrode
- workpiece
- power supply
- cutting
- plasma cutter
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/006—Control circuits therefor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses an air plasma cutter which comprises a cutting gun, a cutting power supply, a control circuit and an arc voltage feedback circuit. The cutting gun comprises a spray nozzle and an electrode. The spray nozzle is tubular and is provided with an open lower end. The electrode is arranged in the spray nozzle, and the lower end of the electrode is located at an opening of the lower end of the spray nozzle. The positive and negative ends of the cutting power supply are separately used for being connected with a workpiece and the electrode. The arc voltage feedback circuit is used for collecting the arc voltage between the electrode and the workpiece. After the electrode and the workpiece are connected with the cutting power supply and electric arcing is achieved, if the arc voltage between the electrode and the workpiece is lower than the preset voltage, power supply between the cutting power supply and the electrode or the workpiece is controlled to be cut off by the control circuit. According to the air plasma cutter, the phenomenon that the spray nozzle of the cutting gun is damaged due to the fact that the gas pressure is too low is avoided in the using process, a pressure switch does not need to be additionally arranged, and the cost is low.
Description
Technical field
The present invention relates to cutting machine technology, more particularly to a kind of air plasma cutter.
Background technology
Plasma is heated to excessive temperature the gas by highly ionized, and it transfers to arc power on workpiece,
High heat makes workpiece fusing and is blown off, forms the working condition of plasma arc cutting.
The ultimate principle (cutting here generally refers to the cutting of metal material) of air plasma cutting mill, is using superfine
And the plasma arc of high temperature, localized metallic is melted rapidly, then cutting method molten metal blown away with air-flow.Plasma
Arc cutting is as cutting efficiency is high, loss is widely used to the row such as all kinds of engineering constructions, manufacture the advantages of low, applied widely
Industry.
We generally call free arc the electric arc that arc density is (uncompressed) under natural conditions；The conduction of free arc
Gas is not ionized completely, and the temperature of electric arc is between 6000 DEG C to 8000 DEG C.And in the presence of air pressure, voltage and magnetic field
The free arc (column section product is proportional to power) of column can be compressed into plasma arc, the little energy of conductive cross-sectional area of plasma arc
Concentrate.In arc column, gas can almost entirely reach ionic condition.Arc temperature may be up to 15000 DEG C -30000 DEG C.Metal can be made
Melted on object rapidly.Air plasma cutting mill be exactly electric arc is compressed in burning torch using compressed air after the plasma that formed
Arc come complete cut, compressed air enter cutting torch after distribute two-way by air chamber, that is, formed plasma gass and auxiliary gas.Deng
Ionized gas arc plays fusing metal effect, and aids in gas then to cool down all parts of cutting torch and blow molten metal off.
Air plasma cutting mill is mainly made up of following part：(1) main power source, can be traditional single-phase or three phase rectifier
Device, single-phase or three-phase controllable silicon rectifier power source and various satisfactory inverters；(2) the gas circuit control of compressed air is provided
System processed；(3) burning torch；(4) cooling system of cutting mill.
In application process, be maintain air plasma cutting mill can be stable cutting workpiece, it is necessary in cutting process
Maintain the compressed gas of certain pressure.Compressed gas method of supplying in existing cutting process is divided into following two：
It is a kind of then to limit the output gas pressure upper limit through air relief valve as shown in figure 1, compressed gas are provided by source of the gas,
Prevent the gas pressure in cutting workpiece fabrication excessive and make cut quality be deteriorated.This kind of compressed gas method of supplying, it is impossible to limit
Determine compression pressure lower limit, compressed gas effectively can not be compressed to electric arc when compression pressure is too low, can cause electricity
Cutting machine nozzle is burnt out by arc.
Another kind is as shown in Fig. 2 then compressed gas are limited on output gas pressure through air relief valve by source of the gas offer
Limit, prevents the gas pressure in cutting workpiece fabrication excessive and makes cut quality be deteriorated, and the pressure used in cutting process
Switch defines the lower limit of compression pressure.This kind of compressed gas method of supplying, can effectively prevent compression pressure mistake
It is low and burn out cutting machine nozzle, but due to increased pressure switch, increased cutting machine cost.
The content of the invention
The technical problem to be solved is to provide a kind of air plasma cutter, in use will not be because
Gas pressure is too low and damage cutting gun nozzle, and pressure switch need not be increased, cost is relatively low.
For solution above-mentioned technical problem, the air plasma cutter that the present invention is provided, which includes cutting gun, cutting electricity
Source, control circuit, executed arc voltage feedback circuit；
The cutting gun includes nozzle, electrode；
The nozzle is tubulose and lower ending opening；
The electrode is placed in nozzle, and lower end is located at nozzle lower ending opening；
The positive and negative two ends of cutting power supply are respectively used to connect workpiece and the electrode；
The executed arc voltage feedback circuit, for acquisition electrode with the arc voltage between workpiece；
The electrode is with connecting cutting power supply and playing electric arc between workpiece after, if electrode is with the electric arc electricity between workpiece
Force down in setting voltage, then the control circuit control disconnects cutting power supply to the power supply of electrode or workpiece.
Preferably, air plasma cutter also includes source of the gas, air relief valve, air valve；
The compressed gas of source of the gas output are injected in nozzle Jing after air relief valve, air valve.
It is preferably, the setting voltage is more than the 1/16 of cutting power supply idle voltage output, and empty less than cutting power supply
Carry the 2/3 of output voltage.
Preferably, cutting power supply idle voltage output is 320V, the setting voltage is more than 20V and is less than 200V.
Preferably, the cutting gun also includes protective cover；
The protective cover is set in outside the nozzle.
Preferably, the protective cover is passed through shielding gas between the nozzle.
Preferably, the electrode is tungsten electrode.
Preferably, the electrode is with connecting cutting power supply and playing electric arc between workpiece after, if electrode is between workpiece
Arc voltage be less than setting voltage, the control circuit also control close air valve.
Preferably, the electrode is with connecting cutting power supply and playing electric arc between workpiece after, if electrode is between workpiece
Arc voltage be less than setting voltage, the control circuit also controlled output warning signal.
The air plasma cutter of the present invention, executed arc voltage feedback circuit is continual to be adopted to arc cutting voltage
Sample simultaneously feeds back to control circuit, and when the gas pressure being injected in nozzle is too small, gas effectively can not be pressed to electric arc
Contracting, causes arc voltage to diminish, and when arc voltage is less than setting voltage extremely, then control circuit control disconnects cutting power supply to electricity
Pole or the power supply of workpiece, make electrode with playing electric arc between workpiece, so as to avoid air plasma cutter from using process
It is middle to damage cutting gun nozzle because gas pressure is too low, and pressure switch need not be increased, cost is relatively low.
Description of the drawings
Fig. 1 is a kind of existing air plasma cutting mill structural representation；
Fig. 2 is existing another kind of air plasma cutting mill structural representation；
Fig. 3 is one example structure schematic diagram of air plasma cutting mill of the present invention；
Fig. 4 is the one embodiment cutting gun structural representation of air plasma cutting mill of the present invention.
Specific embodiment
Clearly complete description is carried out to the technical scheme in the present invention below in conjunction with accompanying drawing, it is clear that described reality
Apply a part of embodiment that example is the present invention, rather than the embodiment of whole.Based on the embodiment in the present invention, the skill of this area
All other embodiment that art personnel are obtained on the premise of creative work is not made belongs to the model of present invention protection
Enclose.
Embodiment one
As shown in figure 1, air plasma cutter, including cutting gun, cutting power supply, control circuit, executed arc voltage feedback
Circuit；
As shown in figure 4, the cutting gun includes nozzle 3, electrode 1；
The nozzle 3 is tubulose and lower ending opening；
The electrode 1 is placed in nozzle 3, and lower end is located at 3 lower ending opening of nozzle；
The positive and negative two ends of cutting power supply are respectively used to connect workpiece 8 and the electrode 1；
The executed arc voltage feedback circuit, for acquisition electrode 1 with the arc voltage between workpiece 8；
The electrode 1 is with connecting cutting power supply and playing electric arc 7 between workpiece after, if electrode 1 is with the electricity between workpiece
Arc voltage is less than setting voltage, then the control circuit control disconnects cutting power supply to the power supply of electrode or workpiece.
Preferably, air plasma cutter also includes source of the gas, air relief valve, air valve, 2 Jing of compressed gas of source of the gas output subtracts
It is injected into after pressure valve, air valve in nozzle 3.
Difference of the setting voltage according to cutting power supply, cutting current and injector electrode, can be variant.Preferably, institute
Setting voltage is stated more than the 1/16 of cutting power supply idle voltage output, and less than the 2/3 of cutting power supply idle voltage output.
Preferably, cutting power supply idle voltage output is 320V, the setting voltage is more than 20V and is less than 200V.
Preferably, the cutting gun also includes protective cover 6；
The protective cover 6 is set in outside the nozzle 3.
Preferably, the protective cover 6 is with being passed through shielding gas 5 between the nozzle 3.
Preferably, the electrode 1 is tungsten electrode.
The air plasma cutter of embodiment one, executed arc voltage feedback circuit is continual to be carried out to arc cutting voltage
Control circuit is sampled and feeds back to, when 2 pressure of gas being injected in nozzle 3 is too small, gas 2 can not effectively to electric arc 7
It is compressed, causes arc voltage to diminish, when arc voltage is less than setting voltage extremely, then control circuit control disconnects cutting electricity
Power supply of the source to electrode 1 or workpiece 8, makes electrode 1 with playing electric arc 7 between workpiece 8, so as to avoid air plasma cutter
Damage cutting gun nozzle in use because gas pressure is too low, and pressure switch need not be increased, cost is relatively low.
Embodiment two
Based on the air plasma cutter of embodiment one, the electrode is with connection cutting power supply between workpiece and plays electric arc
Afterwards, if electrode is less than setting voltage with the arc voltage between workpiece, the control circuit also controls to close air valve, so as to
Save compressed gas.
Preferably, the electrode is with connecting cutting power supply and playing electric arc between workpiece after, if electrode is between workpiece
Arc voltage be less than setting voltage, the control circuit also controlled output warning signal, point out air plasma cutter work
Make abnormal.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements done etc. are should be included within the scope of protection of the invention.
Claims (9)
1. a kind of air plasma cutter, it is characterised in that anti-including cutting gun, cutting power supply, control circuit, arc voltage
Current feed circuit；
The cutting gun includes nozzle, electrode；
The nozzle is tubulose and lower ending opening；
The electrode is placed in nozzle, and lower end is located at nozzle lower ending opening；
The positive and negative two ends of cutting power supply are respectively used to connect workpiece and the electrode；
The executed arc voltage feedback circuit, for acquisition electrode with the arc voltage between workpiece；
The electrode is with connecting cutting power supply and playing electric arc between workpiece after, if electrode is low with the arc voltage between workpiece
In setting voltage, then the control circuit control disconnects cutting power supply to the power supply of electrode or workpiece.
2. air plasma cutter according to claim 1, it is characterised in that
Air plasma cutter also includes source of the gas, air relief valve, air valve；
The compressed gas of source of the gas output are injected in nozzle Jing after air relief valve, air valve.
3. air plasma cutter according to claim 1, it is characterised in that
The setting voltage more than cutting power supply idle voltage output 1/16, and less than cutting power supply idle voltage output
2/3。
4. air plasma cutter according to claim 3, it is characterised in that
Cutting power supply idle voltage output is 320V, and the setting voltage is more than 20V and is less than 200V.
5. air plasma cutter according to claim 1, it is characterised in that
The cutting gun also includes protective cover；
The protective cover is set in outside the nozzle.
6. air plasma cutter according to claim 5, it is characterised in that
The protective cover is passed through shielding gas between the nozzle.
7. air plasma cutter according to claim 1, it is characterised in that
The electrode is tungsten electrode.
8. air plasma cutter according to claim 1, it is characterised in that
The electrode is with connecting cutting power supply and playing electric arc between workpiece after, if electrode is low with the arc voltage between workpiece
In setting voltage, the control circuit also controls to close air valve.
9. air plasma cutter according to claim 1, it is characterised in that
The electrode is with connecting cutting power supply and playing electric arc between workpiece after, if electrode is low with the arc voltage between workpiece
In setting voltage, the control circuit also controlled output warning signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611245676.2A CN106513957A (en) | 2016-12-29 | 2016-12-29 | Air plasma cutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611245676.2A CN106513957A (en) | 2016-12-29 | 2016-12-29 | Air plasma cutter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106513957A true CN106513957A (en) | 2017-03-22 |
Family
ID=58338396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611245676.2A Pending CN106513957A (en) | 2016-12-29 | 2016-12-29 | Air plasma cutter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106513957A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109604763A (en) * | 2018-12-30 | 2019-04-12 | 上海广为焊接设备有限公司 | A kind of internal pump cutting machine with condensing unit |
| CN115383270A (en) * | 2022-09-27 | 2022-11-25 | 江苏大学 | Gas flow recompression plasma arc welding device and welding process for duplex stainless steel part |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6012276A (en) * | 1983-07-04 | 1985-01-22 | Daihen Corp | Method and device for plasma arc working |
| JPH03110072A (en) * | 1989-09-26 | 1991-05-10 | Origin Electric Co Ltd | Active gas plasma arc machine |
| US20010037996A1 (en) * | 1995-12-15 | 2001-11-08 | Illinois Tool Works Inc. | Method and apparatus for a contact start plasma cutting process |
| CN201581123U (en) * | 2009-09-07 | 2010-09-15 | 上海宝钢设备检修有限公司 | Arc voltage tracking device for plasma spray welding on surface of large-area complicated curve workpiece |
| CN203156212U (en) * | 2012-11-30 | 2013-08-28 | 上海沪工焊接集团股份有限公司 | Pilot-arc control circuit of double-current feedback air plasma cutting machine |
| CN103551716A (en) * | 2013-10-25 | 2014-02-05 | 华南理工大学 | Full-digital high-power plasma arc precise cutting system |
| CN205324961U (en) * | 2015-12-28 | 2016-06-22 | 浙江肯得机电股份有限公司 | Single tube IGBT industrial grade contravariant air plasma arc cutting machine |
| CN206435849U (en) * | 2016-12-29 | 2017-08-25 | 上海通用重工集团有限公司 | Air plasma cutter |
-
2016
- 2016-12-29 CN CN201611245676.2A patent/CN106513957A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6012276A (en) * | 1983-07-04 | 1985-01-22 | Daihen Corp | Method and device for plasma arc working |
| JPH03110072A (en) * | 1989-09-26 | 1991-05-10 | Origin Electric Co Ltd | Active gas plasma arc machine |
| US20010037996A1 (en) * | 1995-12-15 | 2001-11-08 | Illinois Tool Works Inc. | Method and apparatus for a contact start plasma cutting process |
| CN201581123U (en) * | 2009-09-07 | 2010-09-15 | 上海宝钢设备检修有限公司 | Arc voltage tracking device for plasma spray welding on surface of large-area complicated curve workpiece |
| CN203156212U (en) * | 2012-11-30 | 2013-08-28 | 上海沪工焊接集团股份有限公司 | Pilot-arc control circuit of double-current feedback air plasma cutting machine |
| CN103551716A (en) * | 2013-10-25 | 2014-02-05 | 华南理工大学 | Full-digital high-power plasma arc precise cutting system |
| CN205324961U (en) * | 2015-12-28 | 2016-06-22 | 浙江肯得机电股份有限公司 | Single tube IGBT industrial grade contravariant air plasma arc cutting machine |
| CN206435849U (en) * | 2016-12-29 | 2017-08-25 | 上海通用重工集团有限公司 | Air plasma cutter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109604763A (en) * | 2018-12-30 | 2019-04-12 | 上海广为焊接设备有限公司 | A kind of internal pump cutting machine with condensing unit |
| CN115383270A (en) * | 2022-09-27 | 2022-11-25 | 江苏大学 | Gas flow recompression plasma arc welding device and welding process for duplex stainless steel part |
| CN115383270B (en) * | 2022-09-27 | 2024-03-26 | 江苏大学 | Double-phase stainless steel part airflow recompression plasma arc welding device and welding process thereof |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170322 |