CN206598001U - Transfevent plasma arc generating means - Google Patents
Transfevent plasma arc generating means Download PDFInfo
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- CN206598001U CN206598001U CN201720155382.4U CN201720155382U CN206598001U CN 206598001 U CN206598001 U CN 206598001U CN 201720155382 U CN201720155382 U CN 201720155382U CN 206598001 U CN206598001 U CN 206598001U
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Abstract
The utility model discloses a kind of transfevent plasma arc generating means, it includes power supply, nozzle, electrode needle, workpiece, in addition to starting the arc switch, the first current sensor, the second current sensor, control circuit；Nozzle connects positive source through starting the arc switch；Workpiece connects positive source；Electrode needle connects power cathode；Circuit is controlled, controls starting the arc switch to close first and controls power supply to export striking current；Then, if the second current sensor detects the electric current for flowing through workpiece more than the second setting electric current, the control starting the arc is switched off, and controls power supply to export minor arc electric current；Then, if the first current sensor detects the electric current for flowing through nozzle more than the first setting electric current, control power supply stops output current.Transfevent plasma arc generating means of the present utility model, not only can guard electrode pin will not be burnt to nozzle loop because electric current is excessive, and arc transfer speed is fast.
Description
Technical field
The utility model is related to plasma arc technology, more particularly to a kind of transfevent plasma arc generating means.
Background technology
Plasma arc generating means is as shown in figure 1, in electrode needle (be usually tungsten needle) between nozzle or electrode needle and work
Add a high voltage between part, gas ionization is formed free electric arc through the higher-order of oscillation, the electric arc is by following three compression
Form plasma arc.
1. mechanical compress effect (effect) --- electric arc makes electric arc section by inflexible by there is the nozzle passage of certain pore size
Beam, it is impossible to spread.
2. thermo-squeezing effect --- when being passed through the argon gas or nitrogen of certain pressure and flow, cold airflow is equably surrounded
Electric arc, makes electric arc periphery be cooled down strongly, forces charged particle stream (ion and electronics) to be concentrated toward arc column center, arc column is entered
One step is compressed.
3. pinch effect --- the electronics of directed movement, ion stream are exactly the current－carrying conductor being parallel to each other, in arc column
Under the magnetic fields that electric current is produced in itself, the electromagnetic force of generation makes lonely post further shrink.
Electric arc is after three of the above pinch effect, and energy height is concentrated in the arc column of diameter very little, the gas in arc column
Body is ionized into plasma, therefore referred to as plasma arc.
Work as nozzle of small diameter, when big gas flow and increase electric current, the speed that flame passes spray from nozzle is very high, has
There is very big impulsive force, this plasma arc is referred to as " harsh arc ", be mainly used in cutting metal.If conversely, plasma arc is adjusted
When saving into that temperature is relatively low, impulsive force is smaller, the plasma arc is referred to as " flexible arc ", is mainly used in welding.
Plasma arc has two kinds of working methods.One kind is " non-diverting type ", and electric arc burns between electrode needle and nozzle, main
With what plasma spray coating or heating non-conducting material.
Another is " transfevent ", and the plasma arc produced using high frequency is initially formed in electrode needle and plasma nozzle
Between, it is necessary to when welding, then it is transferred on workpiece.Electric arc is after in nozzle with high-frequency arc strike between electrode needle, and electric arc turns
Move on between electrode needle and workpiece and burn, for welding or cutting.
To set up transfevent plasma arc, electrode needle should be connect to power cathode, nozzle and workpiece connect positive source simultaneously, risen
The circuit connected first between electrode needle and nozzle during arc, the electric arc between ignitor pin and nozzle is then rapid to connect electricity
Circuit between pole pin and workpiece, makes arc transfer to directly being burnt between electrode needle and workpiece, while cutting off electrode needle and spray
Circuit between mouth, just formal foundation enters normal operating conditions to transfevent plasma arc.In normal operation, nozzle is not
Plasma arc that is powered, being produced when starting to ignite, is intended only as setting up the intermediary of transfevent plasma arc.
Scheme occurs for a kind of existing transfevent plasma arc as shown in figure 1, in this scheme, after startup, power supply is defeated first
Go out striking current (about 15 arrive 30A) to workpiece and nozzle, electrode needle is monitored to the electricity in workpiece loop using a Hall sensor
Stream, once monitoring that electrode needle has electric current to workpiece loop, then turns off electrode needle to nozzle loop, and power supply is exported to work
The electric current sum of part and nozzle brings up to minor arc electric current (being usually more than 100A), by arc transfer between electrode needle and workpiece
Burning.This scheme cost is low, simple in construction.But due to the moment electrode needle in welding torch or cutting torch contact workpiece to workpiece loop electricity
Shake occurs in stream, arc transfer can be caused to fail.
Scheme occurs for existing another transfevent plasma arc as shown in Fig. 2 in this scheme, after startup, power supply is first
Striking current (about 15 arrive 30A) is exported to workpiece and nozzle, electrode needle is monitored to workpiece loop using a Hall sensor
Electric current, once monitoring that electrode needle has electric current to workpiece loop, then wouldn't turn off electrode needle to nozzle loop, and maintain power supply
It is striking current to export to the electric current sum of workpiece and nozzle, or power supply is exported brought up to the electric current sum of workpiece and nozzle
About 2 times of striking current.Turned off after (such as 100ms to 200ms) after a while, moreover by electrode needle to nozzle loop,
And export power supply to bring up to minor arc electric current to the electric current sum of workpiece and nozzle, by arc transfer between electrode needle and workpiece
Burning.This scheme, will not occur that shaking two leads to workpiece loop current because of the moment electrode needle of welding torch or cutting torch contact workpiece
Arc transfer failure is caused, but the arc transfer time is long, if moreover, electrode needle is to nozzle loop damage (short circuit), minor arc electric current
Electrode needle can be output to simultaneously to nozzle loop, because electrode needle is relatively low to nozzle loop current ability to bear, can cause electrode needle
Burnt to nozzle loop, so that damaging whole transfevent plasma arc generating means.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of transfevent plasma arc generating means, can not only protect
Electrode needle will not burn to nozzle loop because electric current is excessive, and arc transfer speed is fast.
In order to solve the above technical problems, the utility model provide transfevent plasma arc generating means, it include power supply,
Nozzle, electrode needle, workpiece, starting the arc switch, the first current sensor, the second current sensor, control circuit；
The nozzle connects positive source through starting the arc switch；
The workpiece connects positive source；
The electrode needle connects power cathode；
First current sensor, the electric current of the nozzle is flowed through for detecting；
Second current sensor, the electric current of the workpiece is flowed through for detecting；
The control circuit, upon receiving the initiation signal, the control starting the arc start to close and control the power supply defeated
Go out striking current；Then, if the second current sensor detects the electric current for flowing through workpiece more than the second setting electric current, control
The starting the arc is switched off, and controls power supply to export minor arc electric current；Then, if the first current sensor detects the electricity for flowing through nozzle
Stream is more than the first setting electric current, then controls power supply to stop output current；
Minor arc electric current is more than 3 times of striking current, and the first setting electric current and the second setting electric current are respectively less than striking current.
Preferably, striking current is 15A to 30A, minor arc electric current is 90A to 150A.
Preferably, the first current sensor, the second current sensor are Hall current sensor.
Preferably, the nozzle is tubulose and lower ending opening；
The electrode needle is placed in nozzle, and lower end is located at nozzle lower ending opening；
The compressed gas of source of the gas output is injected into nozzle after pressure-reducing valve, air valve.
Preferably, the transfevent plasma arc generating means also includes protective cover；
The protective cover is set in outside the nozzle.
Preferably, the protective cover is with being passed through protection gas between the nozzle.
Preferably, the electrode needle is tungsten needle.
Preferably, the transfevent plasma arc generating means is CUT.
Preferably, the transfevent plasma arc generating means is plasma welding machine.
Transfevent plasma arc generating means of the present utility model, is returned in electrode needle to workpiece loop and electrode needle to nozzle
Road is respectively provided with current sensor, after occurring arc transfer, once monitoring that electrode needle has electric current to nozzle loop, will immediately close
Broken Electrode pin will not burn, simultaneously to workpiece loop current so as to guard electrode pin to nozzle loop because electric current is excessive
Due to electrode needle with after the starting the arc between nozzle if detect power supply during the electric current for flowing through workpiece applies minor arc electric current to work immediately
Part, accelerates arc transfer speed.
Brief description of the drawings
In order to illustrate more clearly of the technical solution of the utility model, the accompanying drawing to being used required for the utility model below
It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present utility model, for ability
For the those of ordinary skill of domain, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other attached
Figure.
Fig. 1 is that scheme schematic diagram occurs for a kind of existing transfevent plasma arc；
Fig. 2 is that scheme schematic diagram occurs for existing another transfevent plasma arc；
Fig. 3 is the example structure schematic diagram of transfevent plasma arc generating means one of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, clear, complete description is carried out to the technical scheme in the utility model, it is clear that retouched
The embodiment stated is a part of embodiment of the present utility model, rather than whole embodiments.Based on the reality in the utility model
Apply example, all other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made, all
Belong to the scope of the utility model protection.
Embodiment one
As shown in figure 3, transfevent plasma arc generating means, including power supply, nozzle 3, electrode needle 1, workpiece 8, the starting the arc are opened
Pass, the first current sensor, the second current sensor, control circuit；
Nozzle 3 connects positive source through starting the arc switch；
Workpiece 8 connects positive source；
Electrode needle 1 connects power cathode；
First current sensor, the electric current of nozzle 3 is flowed through for detecting；
Second current sensor, the electric current of workpiece 8 is flowed through for detecting；
The control circuit, upon receiving the initiation signal, the control starting the arc start to close and control the power supply defeated
Go out striking current；Then, if the second current sensor detects the electric current for flowing through workpiece more than the second setting electric current, control
The starting the arc is switched off, and controls power supply to export minor arc electric current；Then, if the first current sensor detects the electricity for flowing through nozzle
Stream is more than the first setting electric current, then controls power supply to stop output current；Minor arc electric current is more than 3 times of striking current, the first setting
Electric current and the second setting electric current are respectively less than striking current.
Preferably, striking current is about 15A to 30A, minor arc electric current is about 90A to 150A.
Preferably, the first current sensor, the second current sensor are Hall current sensor.
The transfevent plasma arc generating means of embodiment one, nozzle 3 is arrived in electrode needle 1 to workpiece loop 8 and electrode needle 1
Loop is respectively provided with current sensor, after occurring arc transfer, once monitor that electrode needle 1 has electric current to nozzle loop, immediately
Shut-off electrode needle 1 is arrived into the loop current of workpiece 8, will not be because electric current is excessive and burns to the loop of nozzle 3 so as to guard electrode pin 1
Ruin.Simultaneously as after electrode needle 1 is with 3 starting the arc of nozzle, when detecting the electric current for flowing through workpiece 8, power supply applies master immediately
Arc current accelerates arc transfer speed to workpiece 8.
Embodiment two
Transfevent plasma arc generating means based on embodiment one, the nozzle 3 is tubulose and lower ending opening；
The electrode needle 1 is placed in nozzle 3, and lower end is located at the lower ending opening of nozzle 3；
The compressed gas 2 of source of the gas output is injected into after pressure-reducing valve, air valve in nozzle 3；
Preferably, the transfevent plasma arc generating means also includes protective cover 6；
The protective cover 6 is set in outside the nozzle 3.
Preferably, the protective cover 6 be passed through between the nozzle 3 protection gas 5.
Preferably, the electrode needle 1 is tungsten needle.
The transfevent plasma arc generating means of embodiment two, the gas 2 being injected into nozzle 3 is compressed to electric arc 7,
Make electrode 1 with playing electric arc 7 between workpiece 8.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements done etc. should be included in the utility model
Within the scope of protection.
Claims (9)
1. a kind of transfevent plasma arc generating means, including power supply, nozzle, electrode needle, workpiece；Characterized in that, also including
Starting the arc switch, the first current sensor, the second current sensor, control circuit；
The nozzle connects positive source through starting the arc switch；
The workpiece connects positive source；
The electrode needle connects power cathode；
First current sensor, the electric current of the nozzle is flowed through for detecting；
Second current sensor, the electric current of the workpiece is flowed through for detecting；
The control circuit, upon receiving the initiation signal, the control starting the arc start to close and control the power supply to export
Arc current；Then, if the second current sensor detects the electric current for flowing through workpiece more than the second setting electric current, the starting the arc is controlled
Switch off, and control power supply to export minor arc electric current；Then, if the first current sensor detect flow through nozzle electric current it is big
In the first setting electric current, then power supply is controlled to stop output current；
Minor arc electric current is more than 3 times of striking current, and the first setting electric current and the second setting electric current are respectively less than striking current.
2. transfevent plasma arc generating means according to claim 1, it is characterised in that
Striking current is 15A to 30A, and minor arc electric current is 90A to 150A.
3. transfevent plasma arc generating means according to claim 1, it is characterised in that
First current sensor, the second current sensor are Hall current sensor.
4. transfevent plasma arc generating means according to claim 1, it is characterised in that
The nozzle is tubulose and lower ending opening；
The electrode needle is placed in nozzle, and lower end is located at nozzle lower ending opening；
The compressed gas of source of the gas output is injected into nozzle after pressure-reducing valve, air valve.
5. transfevent plasma arc generating means according to claim 4, it is characterised in that
The transfevent plasma arc generating means also includes protective cover；
The protective cover is set in outside the nozzle.
6. transfevent plasma arc generating means according to claim 5, it is characterised in that
The protective cover is with being passed through protection gas between the nozzle.
7. transfevent plasma arc generating means according to claim 1, it is characterised in that
The electrode needle is tungsten needle.
8. transfevent plasma arc generating means according to claim 1, it is characterised in that
The transfevent plasma arc generating means is CUT.
9. transfevent plasma arc generating means according to claim 1, it is characterised in that
The transfevent plasma arc generating means is plasma welding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720155382.4U CN206598001U (en) | 2017-02-21 | 2017-02-21 | Transfevent plasma arc generating means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720155382.4U CN206598001U (en) | 2017-02-21 | 2017-02-21 | Transfevent plasma arc generating means |
Publications (1)
| Publication Number | Publication Date |
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| CN206598001U true CN206598001U (en) | 2017-10-31 |
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ID=60147531
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720155382.4U Active CN206598001U (en) | 2017-02-21 | 2017-02-21 | Transfevent plasma arc generating means |
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| Country | Link |
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| CN (1) | CN206598001U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114406424A (en) * | 2022-01-25 | 2022-04-29 | 常州九圣焊割设备股份有限公司 | Cutting torch protection method and device |
-
2017
- 2017-02-21 CN CN201720155382.4U patent/CN206598001U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114406424A (en) * | 2022-01-25 | 2022-04-29 | 常州九圣焊割设备股份有限公司 | Cutting torch protection method and device |
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