CN108031960A - A kind of constant current arc-maintaining device and cutting machine - Google Patents
A kind of constant current arc-maintaining device and cutting machine Download PDFInfo
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- CN108031960A CN108031960A CN201711283224.8A CN201711283224A CN108031960A CN 108031960 A CN108031960 A CN 108031960A CN 201711283224 A CN201711283224 A CN 201711283224A CN 108031960 A CN108031960 A CN 108031960A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The present invention is suitable for cutting machine technical field, there is provided a kind of constant current arc-maintaining device and cutting machine, including：Rectification module, isolation drive module, arc maintenance module, arc maintenance line；The output cathode of the rectification module connects the collector of the arc maintenance module and the workpiece of the cutting machine；The grid of the arc maintenance module connects the first output terminal of the isolation drive module, and the emitter of the arc maintenance module connects the second output terminal of the isolation drive module, and the emitter of the arc maintenance module connects the arc maintenance line；The arc maintenance line is adapted to the burning torch nozzle of the cutting machine；The output negative pole of the rectification module is adapted to the burning torch electrode of the cutting machine；Using turning on and off for arc maintenance mould insulated gate bipolar transistor in the block, to control the break-make of back ground current, the failure rate in keep-alive circuit make and break process is greatly reduced.
Description
Technical field
The invention belongs to cutting machine technical field, more particularly to a kind of constant current arc-maintaining device and cutting machine.
Background technology
Air low-temperature plasma technology has the various aspects such as cut quality, cutting speed, operating cost, cutting metal species
Comprehensive advantage, increasingly approved be subject to industry, the popularity rate in mechanical processing is higher and higher.
In the keep-alive circuit of conventional air plasma cutting machine, high-power current-limiting resistance of typically connecting after rectification output
Adjust back ground current, and the high failure rate during control back ground current turns on and off.
The content of the invention
In view of this, an embodiment of the present invention provides a kind of constant current arc-maintaining device and cutting machine, to solve in the prior art
In back ground current make and break process the problem of high failure rate.
The first aspect of the embodiment of the present invention provides a kind of constant current arc-maintaining device, including：
Rectification module, isolation drive module, arc maintenance module, arc maintenance line；
The output cathode of the rectification module connects the collector of the arc maintenance module and the workpiece of the cutting machine；It is described
The grid of arc maintenance module connects the first output terminal of the isolation drive module, the emitter connection of the arc maintenance module it is described every
From the second output terminal of drive module, the emitter of the arc maintenance module connects the arc maintenance line；The arc maintenance line is adapted to
The burning torch nozzle of the cutting machine；The output negative pole of the rectification module is adapted to the burning torch electrode of the cutting machine；
The input terminal of the rectification module is suitable for receiving back ground current, and will be exported after the back ground current rectification of reception, institute
Stating isolation drive module controls the arc maintenance module to turn on and off；When the arc maintenance module is opened, the arc maintenance module is from institute
The output cathode for stating rectification module receives the back ground current after rectification, and the back ground current after the rectification is sent to the dimension
Through excessive between the burning torch electrode of camber line, the burning torch nozzle for connecting the arc maintenance line and the output negative pole for connecting the rectification module
Frequency electric discharge produces electric arc；During the arc maintenance module shut-off, the output cathode of the back ground current from the rectification module flows to institute
The workpiece of cutting machine is stated, between the burning torch electrode for connecting the workpiece of the cutting machine and the output negative pole of the connection rectification module
Produce electric arc.
Optionally, the rectification module includes：
PI adjustment units, inversion unit, main transformer coupling rectification unit；
The output terminal of the PI adjustment units connects the input terminal of the inversion unit, and the output terminal of the inversion unit connects
The input terminal of the main transformer coupling unit is connect, the output cathode of the main transformer coupling rectification unit connects the collection of the arc maintenance module
Electrode, the output negative pole of the main transformer coupling rectification unit are adapted to the burning torch electrode of the cutting machine；
After the back ground current received is amplified, filtered by the PI adjustment units, the inversion unit is inputted,
The inversion unit will be received inputs the main transformer coupling rectification list after amplification, filtered back ground current inversion
The back ground current by inversion received is carried out the dimension after coupling isolation obtains rectification by member, the main transformer coupling rectification unit
Arc current.
Optionally, the rectification module further includes：
Primary side feedback unit；
The input terminal of the primary side feedback unit connects the output terminal of the inversion unit, and it is whole to connect the main transformer coupling
Flow the input terminal of unit；The output terminal of the primary side feedback unit connects the input terminal of the PI adjustment units；
Back ground current after the inversion received is fed back to the PI adjustment units, the PI by the primary side feedback unit
The back ground current of the received primary side feedback unit feedback of adjustment unit docking is adjusted.
Optionally, the PI adjustment units include amplification subelement；
The amplification subelement includes：
First resistor, the first capacitance, zener diode, the first operational amplifier；
The first end of the first resistor connects the reverse input end of first operational amplifier, the first resistor
Second end connects the first end of first capacitance；
The second end of first capacitance connects the output terminal of first operational amplifier；
The cathode of the zener diode connects the reverse input end of first operational amplifier, the zener diode
Anode connect the output terminal of first operational amplifier；
The positive input ground connection of first operational amplifier；
The back ground current received is amplified by the amplification subelement, obtains amplified back ground current.
Optionally, the PI adjustment units further include：
Partial pressure subelement, signal follow subelement, first-order filtering subelement, pwm chip；
The amplification subelement, partial pressure subelement, signal follow subelement, first-order filtering subelement, pwm chip according to
Secondary electric connection；
The partial pressure subelement includes：
Second resistance, 3rd resistor, the second capacitance；
The output terminal of first end connection first operational amplifier of the second resistance, the second of the second resistance
End connects the first end of the 3rd resistor, and connects the first end of second capacitance；
The second end of the 3rd resistor, the second end of second capacitance are grounded respectively；
The signal follows subelement to include the second operational amplifier；
The positive input of second operational amplifier connects the second end of the second resistance, and second computing is put
The reverse input end of big device connects the output terminal of second operational amplifier；
The first-order filtering subelement includes：
4th resistance, the 3rd capacitance；
The output terminal of first end connection second operational amplifier of 4th resistance, the second of the 4th resistance
End connects the first end of the 3rd capacitance, and the first end of the 3rd capacitance connects the pwm chip；
The second end ground connection of 3rd capacitance；
What the partial pressure subelement will receive carries out partial pressure by the amplified back ground current of amplification subelement, and will divide
Back ground current after pressure inputs the signal and follows subelement, and the signal follows subelement to the back ground current after the partial pressure
Carry out signal to follow, and the back ground current that signal is followed inputs the first-order filtering subelement, first-order filtering
The back ground current received is carried out first-order filtering processing by unit, and the back ground current after processing is inputted the PWM and controls core
Piece, the pwm chip control the pulsewidth of pwm signal by the back ground current received, and using described in pwm signal driving
Inversion unit.
Optionally, the arc maintenance module includes：
First insulated gate bipolar transistor, the second insulated gate bipolar transistor；
The output cathode of the collector connection rectification module of first insulated gate bipolar transistor, described first
The grid of insulated gate bipolar transistor connects the first output terminal of the isolation drive module, first insulated gate bipolar
The emitter of transistor connects the second output terminal of the isolation drive module, the hair of first insulated gate bipolar transistor
Emitter-base bandgap grading connects the arc maintenance line；
The output cathode of the collector connection rectification module of second insulated gate bipolar transistor, described second
The grid of insulated gate bipolar transistor connects the 3rd output terminal of the isolation drive module, second insulated gate bipolar
The emitter of transistor connects the second output terminal of the isolation drive module, the hair of second insulated gate bipolar transistor
Emitter-base bandgap grading connects the arc maintenance line.
Optionally, the constant current arc-maintaining device further includes：
Absorption module, high-frequency coupling coil；
The input terminal of the absorption module connects the output cathode of the rectification module, and connects the collection of the arc maintenance module
Electrode, the output terminal of the absorption module connects the arc maintenance line, and connects the emitter of the arc maintenance module；The high frequency coupling
The first end of zygonema circle connects the output negative pole of the rectification module, and the second end of the high-frequency coupling coil is adapted to described
The burning torch electrode of cutting machine；
When the arc maintenance module turns off, the absorption module absorbs due to voltage spikes.
Optionally, the absorption module includes：
5th resistance, the 6th resistance, the 4th capacitance, diode；
The first end of 5th resistance connects the output cathode of the rectification module, and the second end of the 5th resistance connects
Connect the first end of the 6th resistance；
The second end of 6th resistance connects the arc maintenance line；
The cathode of the diode connects the output cathode of the rectification module, the anode connection of the diode described the
The first end of four capacitances；
The second end of 4th capacitance connects the arc maintenance line；
The anode of the diode connects the second end of the 5th resistance.
The second aspect of the embodiment of the present invention provides a kind of cutting machine, including：Any one of burning torch, such as claim 1 to 8
The constant current arc-maintaining device.
Optionally, the burning torch includes：
Nozzle, electrode；
The nozzle of the burning torch connects the arc maintenance line；
The electrode of the burning torch connects the second end of the high-frequency coupling coil；
The electrode of the nozzle for connecting the burning torch of the arc maintenance line and the burning torch for the second end for connecting the high-frequency coupling coil
Between by high-frequency discharge produce electric arc.
Existing beneficial effect is the embodiment of the present invention compared with prior art：
The output cathode of the rectification module is connected the collector of the arc maintenance module and the cutting machine by the present invention
Workpiece；The grid of the arc maintenance module connects the first output terminal of the isolation drive module, the emitter of the arc maintenance module
The second output terminal of the isolation drive module is connected, the emitter of the arc maintenance module connects the arc maintenance line；The arc maintenance
Line is adapted to the burning torch nozzle of the cutting machine；The output negative pole of the rectification module is adapted to the burning torch of the cutting machine
Electrode；Using turning on and off for arc maintenance mould insulated gate bipolar transistor in the block, to control the break-make of back ground current, significantly
Reduce the failure rate in keep-alive circuit make and break process.
Brief description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the schematic diagram of constant current arc-maintaining device provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram for the constant current arc-maintaining device that another embodiment of the present invention provides；
Fig. 3 is the schematic diagram for the constant current arc-maintaining device that another embodiment of the present invention provides；
Fig. 4 is the schematic diagram of PI adjustment units provided in an embodiment of the present invention；
Embodiment
In being described below, in order to illustrate rather than in order to limit, it is proposed that such as tool of particular system structure, technology etc
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that these are specific
The present invention can also be realized in the other embodiments of details.In other situations, omit to well-known system, device, electricity
Road and the detailed description of method, in case unnecessary details hinders description of the invention.
It should be appreciated that ought be special described by the instruction of term " comprising " use in this specification and in the appended claims
Sign, entirety, step, operation, the presence of element and/or component, but be not precluded from one or more of the other feature, entirety, step,
Operation, element, component and/or its presence or addition for gathering.
It is also understood that the term used in this description of the invention is merely for the sake of the mesh for describing specific embodiment
And be not intended to limit the present invention.As description of the invention and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise " one " of singulative, "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in description of the invention and the appended claims is
Refer to any combinations and all possible combinations of one or more of the associated item listed, and including these combinations.
As used in this specification and in the appended claims, term " if " can be according to context quilt
Be construed to " when ... " or " once " or " in response to determining " or " in response to detecting ".Similarly, phrase " if it is determined that " or
" if detecting [described condition or event] " can be interpreted to mean according to context " once it is determined that " or " in response to true
It is fixed " or " once detecting [described condition or event] " or " in response to detecting [described condition or event] ".
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.
Fig. 1 is the schematic diagram of constant current arc-maintaining device provided in an embodiment of the present invention, as shown in the figure, the constant current arc-maintaining device
Including：
Rectification module 100, isolation drive module 200, arc maintenance module 300, arc maintenance line；
The output cathode of the rectification module 100 connects the collector of the arc maintenance module 300 and the work of the cutting machine
Part；The grid of the arc maintenance module 300 connects the first output terminal of the isolation drive module 200, the arc maintenance module 300
Emitter connects the second output terminal of the isolation drive module 200, and the emitter of the arc maintenance module 300 connects the arc maintenance
Line；The arc maintenance line is adapted to the burning torch nozzle of the cutting machine；The output negative pole of the rectification module 100 is adapted to institute
State the burning torch electrode of cutting machine；
The input terminal of the rectification module 100 is suitable for receiving back ground current, and will be exported after the back ground current rectification of reception,
The isolation drive module 200 controls the arc maintenance module 300 to turn on and off；When the arc maintenance module 300 is opened, the dimension
Arc module 300 receives the back ground current after rectification from the output cathode of the rectification module 100, and by the arc maintenance after the rectification
Electric current is sent to the arc maintenance line, connects the burning torch nozzle of the arc maintenance line and connects the output negative pole of the rectification module 100
Burning torch electrode between by high-frequency discharge produce electric arc；During arc maintenance module shut-off, the back ground current is from the rectification
The output cathode of module 100 flows to the workpiece of the cutting machine, connects the workpiece of the cutting machine and connects the rectification module
Electric arc is produced between the burning torch electrode of 100 output negative pole.
In practical applications, when isolation drive module 200 controls arc maintenance module 300 to open, back ground current is from rectification mould
The output cathode of block 100 flows to arc maintenance module 300, and flows to arc maintenance line by arc maintenance module 300, is cut by arc maintenance line flow direction
The burning torch nozzle of cutting mill, at this time, between the burning torch nozzle of cutting machine and the burning torch electrode of output negative pole for connecting rectification module 100
Electric arc is produced by high-frequency discharge, which can be used as the electric arc that ignites；When isolation drive module 200 controls arc maintenance module 300 to close
When disconnected, the output cathode of back ground current from rectification module 100 flows to the workpiece of cutting machine, at this time, the workpiece of cutting machine and connection
Electric arc is produced between the burning torch electrode of the output negative pole of rectification module 100, which is used for the normal work of cutting machine.
The output cathode of the rectification module is connected the collector of the arc maintenance module, the arc maintenance module by the present embodiment
Collector be adapted to the workpiece of the cutting machine；The grid of the arc maintenance module connects the first of the isolation drive module
Output terminal, the emitter of the arc maintenance module connect the second output terminal of the isolation drive module, the hair of the arc maintenance module
Emitter-base bandgap grading connects the arc maintenance line；The arc maintenance line is adapted to the burning torch nozzle of the cutting machine；The output of the rectification module
Anode is adapted to the burning torch electrode of the cutting machine；Using turning on and off for arc maintenance mould transistor in the block, to control dimension
The break-make of arc current, greatly reduces the failure rate in keep-alive circuit make and break process.
Fig. 2 is the schematic diagram for the constant current arc-maintaining device that further embodiment of this invention provides, on the basis of embodiment illustrated in fig. 1
On, shown constant current arc-maintaining device further includes：
Optionally, the arc maintenance module 100 includes：
First insulated gate bipolar transistor G1, the second insulated gate bipolar transistor G2；
The collector of the first insulated gate bipolar transistor G1 connects the output cathode of the rectification module 100, institute
The grid for stating the first insulated gate bipolar transistor G1 connects the first output terminal of the isolation drive module 200, and described first
The emitter of insulated gate bipolar transistor G1 connects the second output terminal of the isolation drive module 200, first insulation
The emitter of grid bipolar transistor G1 connects the arc maintenance line；
The collector of the second insulated gate bipolar transistor G2 connects the output cathode of the rectification module 100, institute
The grid for stating the second insulated gate bipolar transistor G2 connects the 3rd output terminal of the isolation drive module 200, and described second
The emitter of insulated gate bipolar transistor G2 connects the second output terminal of the isolation drive module 200, second insulation
The emitter of grid bipolar transistor G2 connects the arc maintenance line.
Wherein, insulated gate bipolar transistor, also referred to as IGBT (Insulated Gate Bipolar Transistor),
The compound full-control type voltage driven type power half being made of BJT (double pole triode) and MOS (insulating gate type field effect tube)
Conductor device, has the high input impedance of MOSFET (metal-oxide half field effect transistor) and the low conducting pressure of GTR (power transistor) concurrently
Advantage of both drop, i.e. driving power are small, saturation pressure reduces, and are often suitable for the converter system of more than DC voltage 600V, such as
Alternating current generator, frequency converter, Switching Power Supply etc..The on-off action of IGBT is by adding positive grid voltage to form raceway groove, gives PNP crystalline substances
Body pipe provides grid current, turns on IGBT；Conversely, plus reverse grid voltage eliminate raceway groove, cut off grid current, close IGBT
It is disconnected.Preferably, the insulated gate bipolar transistor in the present embodiment can select fairchild 60A/600V.
Optionally, the constant current arc-maintaining device further includes：
Absorption module 400, high-frequency coupling coil T1；
The input terminal of the absorption module 400 connects the output cathode of the rectification module 100, and connects the arc maintenance mould
The collector of block 300, the output terminal of the absorption module 400 connects the arc maintenance line, and connects the hair of the arc maintenance module 300
Emitter-base bandgap grading；The first end of the high-frequency coupling coil T1 connects the output negative pole of the rectification module 100, the high-frequency coupling coil
The second end of T1 is adapted to the burning torch electrode of the cutting machine；
When the arc maintenance module 300 turns off, the absorption module 400 absorbs due to voltage spikes.
In practical applications, absorption module is connected with arc maintenance wired in parallel.When arc maintenance module turns off, to pass through arc maintenance mould
The back ground current of block is blocked, and be cannot pass through arc maintenance module and is flowed to arc maintenance line, so as to produce due to voltage spikes.At this time, with arc maintenance mould
The absorption module of block parallel connection absorbs this due to voltage spikes, to ensure the reliability in the constant current arc-maintaining device course of work.
Optionally, the absorption module 400 includes：
5th resistance R1, the 6th resistance R2, the 4th capacitance C1, diode D1；
The first end of the 5th resistance R1 connects the output cathode of the rectification module 100, the 5th resistance R1's
Second end connects the first end of the 6th resistance R2；
The second end of the 6th resistance R2 connects the arc maintenance line；
The cathode of the diode D1 connects the output cathode of the rectification module 100, and the anode of the diode D1 connects
Connect the first end of the 4th capacitance C1；
The second end of the 4th capacitance C1 connects the arc maintenance line；
The anode of the diode D1 connects the second end of the 5th resistance R1.
This implementation connects and composes arc maintenance module using insulated gate bipolar transistor, with the profit in conventional constant current arc-maintaining device
Compared with the break-make of mechanical contact relay control back ground current, greatly reduce the failure in keep-alive circuit make and break process
Rate；And it is connected absorption module with arc maintenance wired in parallel so that can absorb due to voltage spikes when arc maintenance module turns off, ensure that
Reliability in arc maintenance module routine.
Fig. 3 is the schematic diagram for the constant current arc-maintaining device that further embodiment of this invention provides, on the basis of embodiment illustrated in fig. 2
On, it can also include：
Optionally, the rectification module 100 includes：
PI adjustment units 101, inversion unit 102, main transformer coupling unit 103；
The output terminal of the PI adjustment units 101 connects the input terminal of the inversion unit 102, the inversion unit 102
Output terminal connect the input terminal of the main transformer coupling unit 103, described in the output cathode connection of the main transformer coupling unit 103
The collector of arc maintenance module 300, the output negative pole of the main transformer coupling unit 103 are adapted to the burning torch electricity of the cutting machine
Pole；
After the back ground current received is amplified, filtered by the PI adjustment units 101, the inversion list is inputted
Member, the inversion unit 102 will be received inputs the main transformer coupling list after amplification, filtered back ground current inversion
Member 103, the main transformer coupling unit 103 by the back ground current by inversion received carry out coupling isolation obtain rectification after
Back ground current.
Optionally, the rectification module 100 further includes：
Primary side feedback unit；
The input terminal of the primary side feedback unit connects the output terminal of the inversion unit 102, and connects the main transformer coupling
Close the input terminal of unit 103；The output terminal of the primary side feedback unit connects the input terminal of the PI adjustment units 101；
Back ground current after the inversion received is fed back to the PI adjustment units 101, institute by the primary side feedback unit
State PI adjustment units 101 and dock the back ground current of received primary side feedback unit feedback and be adjusted.
The present embodiment adds PI adjustment units in rectification module, for adjusting to be amplified, filtered to back ground current, and
Increase primary side feedback unit, for the back ground current after inversion to be fed back to PI adjustment units；Realize and back ground current is put down
Steady control, and compared with the current-limiting mode for high-power small resistor of connecting in traditional arc-maintaining device, greatly reduce circuit loss.
Fig. 4 is the schematic diagram that PI provided in an embodiment of the present invention adjusts circuit, as shown in the figure, the PI adjustment units 101
Including amplifying subelement 1011；
The amplification subelement 1011 includes：
First resistor R13, the first capacitance C11, zener diode Z11, the first operational amplifier IC1B；
The first end of the first resistor R13 connects the reverse input end of the first operational amplifier IC1B, and described the
The second end of one resistance R13 connects the first end of the first capacitance C11；
The second end of the first capacitance C11 connects the output terminal of the first operational amplifier IC1B；
The cathode of the zener diode Z11 connects the reverse input end of the first operational amplifier IC1B, described steady
The anode of diode Z11 is pressed to connect the output terminal of the first operational amplifier IC1B；
The positive input ground connection of the first operational amplifier IC1B；
The back ground current received is amplified by the amplification subelement 1011, obtains amplified arc maintenance electricity
Stream.
Optionally, the PI adjustment units 101 further include：
Partial pressure subelement 1012, signal follow subelement 1013, first-order filtering subelement 1014, pwm chip；
The amplification subelement 1011, partial pressure subelement 1012, signal follow subelement 1013, first-order filtering subelement
1014th, pwm chip is electrically connected successively；
The partial pressure subelement 1012 includes：
Second resistance R14,3rd resistor R15, the second capacitance C12；
The first end of the second resistance R14 connects the output terminal of the first operational amplifier IC1B, second electricity
The second end for hindering R14 connects the first end of the 3rd resistor R15, and connects the first end of the second capacitance C12；
The second end of the 3rd resistor R15, the second end of the second capacitance C12 are grounded respectively；
The signal follows subelement 1013 to include the second operational amplifier IC1A；
The positive input of the second operational amplifier IC1A connects the second end of the second resistance R14, and described the
The reverse input end of two operational amplifier IC1A connects the output terminal of the second operational amplifier IC1A；
The first-order filtering subelement 1014 includes：
4th resistance R16, the 3rd capacitance C13；
The first end of the 4th resistance R16 connects the output terminal IC1A of second operational amplifier, the 4th electricity
The second end for hindering R16 connects the first end of the 3rd capacitance C13, and the first end of the 3rd capacitance C13 connects the PWM controls
Coremaking piece；
The second end ground connection of the 3rd capacitance C13；
The partial pressure subelement 1012 will be received carries out partial pressure by the amplified back ground current of amplification subelement, and
Back ground current after partial pressure is inputted into the signal and follows subelement 1013, the signal follows subelement 1013 to the partial pressure
Back ground current afterwards carries out signal and follows, and the back ground current that signal is followed inputs the first-order filtering subelement
1014, the back ground current received is carried out first-order filtering processing by the first-order filtering subelement 1014, and by the dimension after processing
Arc current inputs the pwm chip, and the pwm chip controls the arteries and veins of pwm signal by the back ground current received
Width, and drive the inversion unit using pwm signal.
In practical applications, it is preferred that pwm chip can select UC3846.The 3rd electricity in first-order filtering unit
The 5th foot of the first end connection UC3846 of appearance.UC3846 controls the pulsewidth of output pwm signal by the height of the 5th foot voltage,
The pulsewidth of pwm signal can control the size of cutting machine output power, so as to achieve the purpose that to control back ground current size.
Amplification subelement in PI adjustment units, partial pressure subelement, signal are followed subelement, first-order filtering by the present embodiment
Subelement, pwm chip are electrically connected successively；The amplification to back ground current, partial pressure are realized, follows, filter and size control
System, it is achieved thereby that the steady control to back ground current.
An embodiment of the present invention provides a kind of cutting machine, including：Burning torch, such as constant current of claim 1 to 8 any one of them
Arc-maintaining device.
Optionally, the burning torch includes：
Nozzle, electrode；
The nozzle of the burning torch connects the arc maintenance line；
The electrode of the burning torch connects the second end of the high-frequency coupling coil；
The electrode of the nozzle for connecting the burning torch of the arc maintenance line and the burning torch for the second end for connecting the high-frequency coupling coil
Between by high-frequency discharge produce electric arc.
In practical applications, cutting machine includes air plasma cutter.When arc maintenance module is opened, the burning torch of cutting machine
Electric arc is produced by high-frequency discharge between nozzle and burning torch electrode, which can be used as the electric arc that ignites；When arc maintenance module turns off,
Electric arc is produced between the workpiece and burning torch electrode of cutting machine, which is used for the normal work of cutting machine.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each work(
Can unit, module division progress for example, in practical application, can be as needed and by above-mentioned function distribution by different
Functional unit, module are completed, i.e., the internal structure of described device are divided into different functional units or module, more than completion
The all or part of function of description.Each functional unit, module in embodiment can be integrated in a processing unit, also may be used
To be that unit is individually physically present, can also two or more units integrate in a unit, it is above-mentioned integrated
Unit can both be realized in the form of hardware, can also be realized in the form of SFU software functional unit.In addition, each function list
Member, the specific name of module are not limited to the protection domain of the application also only to facilitate mutually distinguish.Said system
The specific work process of middle unit, module, may be referred to the corresponding process in preceding method embodiment, details are not described herein.
In the above-described embodiments, the description to each embodiment all emphasizes particularly on different fields, and is not described in detail or remembers in some embodiment
The part of load, may refer to the associated description of other embodiments.
In embodiment provided by the present invention, it should be understood that disclosed device, can be real by another way
It is existing.For example, device embodiment described above is only schematical, for example, the division of the module or unit, is only
A kind of division of logic function, can there is an other dividing mode when actually realizing, for example, multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be by some interfaces, the INDIRECT COUPLING or communication of device or unit connect
Connect, can be electrical, machinery or other forms.
The unit illustrated as separating component may or may not be physically separate, be shown as unit
The component shown may or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
In network unit.Some or all of unit therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, can also
That unit is individually physically present, can also two or more units integrate in a unit.Above-mentioned integrated list
Member can both be realized in the form of hardware, can also be realized in the form of SFU software functional unit.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although with reference to foregoing reality
Example is applied the present invention is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to foregoing each
Technical solution described in embodiment is modified, or carries out equivalent substitution to which part technical characteristic；And these are changed
Or replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical solution, should all
Within protection scope of the present invention.
Claims (10)
- A kind of 1. constant current arc-maintaining device, it is characterised in that applied to cutting machine, including：Rectification module, isolation drive module, arc maintenance module, arc maintenance line；The output cathode of the rectification module connects the collector of the arc maintenance module and the workpiece of the cutting machine；The arc maintenance The grid of module connects the first output terminal of the isolation drive module, and the emitter connection isolation of the arc maintenance module is driven Second output terminal of dynamic model block, the emitter of the arc maintenance module connect the arc maintenance line；The arc maintenance line is adapted to described The burning torch nozzle of cutting machine；The output negative pole of the rectification module is adapted to the burning torch electrode of the cutting machine；The input terminal of the rectification module is suitable for receiving back ground current, and will be exported after the back ground current rectification of reception, it is described every The arc maintenance module is controlled to turn on and off from drive module；When the arc maintenance module is opened, the arc maintenance module is from described whole The output cathode of flow module receives the back ground current after rectification, and the back ground current after the rectification is sent to the arc maintenance Pass through high frequency between the burning torch electrode of line, the burning torch nozzle for connecting the arc maintenance line and the output negative pole for connecting the rectification module Electric discharge produces electric arc；During the arc maintenance module shut-off, described in output cathode flow direction of the back ground current from the rectification module Produced between the burning torch electrode of the workpiece of cutting machine, the workpiece for connecting the cutting machine and the output negative pole for connecting the rectification module Raw electric arc.
- 2. constant current arc-maintaining device as claimed in claim 1, it is characterised in that the rectification module includes：PI adjustment units, inversion unit, main transformer coupling rectification unit；The output terminal of the PI adjustment units connects the input terminal of the inversion unit, the output terminal connection institute of the inversion unit The input terminal of main transformer coupling unit is stated, the output cathode of the main transformer coupling rectification unit connects the current collection of the arc maintenance module Pole, the output negative pole of the main transformer coupling rectification unit are adapted to the burning torch electrode of the cutting machine；After the back ground current received is amplified, filtered by the PI adjustment units, the inversion unit is inputted, it is described Inversion unit will be received inputs the main transformer coupling rectification unit, institute after amplification, filtered back ground current inversion Main transformer coupling rectification unit is stated to carry out the back ground current by inversion received to obtain arc maintenance electricity after rectification again is isolated in coupling Stream.
- 3. constant current arc-maintaining device as claimed in claim 2, it is characterised in that the rectification module further includes：Primary side feedback unit；The input terminal of the primary side feedback unit connects the output terminal of the inversion unit, and connects the main transformer coupling rectification list The input terminal of member；The output terminal of the primary side feedback unit connects the input terminal of the PI adjustment units；Back ground current after the inversion received is fed back to the PI adjustment units by the primary side feedback unit, and the PI is adjusted The back ground current of the received primary side feedback unit feedback of unit docking is adjusted.
- 4. constant current arc-maintaining device as claimed in claim 3, it is characterised in that the PI adjustment units include amplification subelement；The amplification subelement includes：First resistor, the first capacitance, zener diode, the first operational amplifier；The reverse input end of first end connection first operational amplifier of the first resistor, the second of the first resistor End connects the first end of first capacitance；The second end of first capacitance connects the output terminal of first operational amplifier；The cathode of the zener diode connects the reverse input end of first operational amplifier, and the zener diode is born Pole connects the output terminal of first operational amplifier；The positive input ground connection of first operational amplifier；The back ground current received is amplified by the amplification subelement, obtains amplified back ground current.
- 5. constant current arc-maintaining device as claimed in claim 4, it is characterised in that the PI adjustment units further include：Partial pressure subelement, signal follow subelement, first-order filtering subelement, pwm chip；The amplification subelement, partial pressure subelement, signal follow subelement, first-order filtering subelement, pwm chip electric successively Property connection；The partial pressure subelement includes：Second resistance, 3rd resistor, the second capacitance；The first end of the second resistance connects the output terminal of first operational amplifier, and the second end of the second resistance connects The first end of the 3rd resistor is connect, and connects the first end of second capacitance；The second end of the 3rd resistor, the second end of second capacitance are grounded respectively；The signal follows subelement to include the second operational amplifier；The positive input of second operational amplifier connects the second end of the second resistance, second operational amplifier Reverse input end connect the output terminal of second operational amplifier；The first-order filtering subelement includes：4th resistance, the 3rd capacitance；The first end of 4th resistance connects the output terminal of second operational amplifier, and the second end of the 4th resistance connects The first end of the 3rd capacitance is connect, the first end of the 3rd capacitance connects the pwm chip；The second end ground connection of 3rd capacitance；The partial pressure subelement will be received carries out partial pressure by the amplified back ground current of amplification subelement, and by after partial pressure Back ground current input the signal and follow subelement, the signal follows subelement to carry out the back ground current after the partial pressure Signal follows, and the back ground current that signal is followed inputs the first-order filtering subelement, the first-order filtering subelement The back ground current received is subjected to first-order filtering processing, and the back ground current after processing is inputted into the pwm chip, institute The pulsewidth that pwm chip controls pwm signal by the back ground current received is stated, and the inversion is driven using pwm signal Unit.
- 6. constant current arc-maintaining device as claimed in claim 1, it is characterised in that the arc maintenance module includes：First insulated gate bipolar transistor, the second insulated gate bipolar transistor；The collector of first insulated gate bipolar transistor connects the output cathode of the rectification module, first insulation The grid of grid bipolar transistor connects the first output terminal of the isolation drive module, the first insulated gate bipolar crystal The emitter of pipe connects the second output terminal of the isolation drive module, the emitter of first insulated gate bipolar transistor Connect the arc maintenance line；The collector of second insulated gate bipolar transistor connects the output cathode of the rectification module, second insulation The grid of grid bipolar transistor connects the 3rd output terminal of the isolation drive module, the second insulated gate bipolar crystal The emitter of pipe connects the second output terminal of the isolation drive module, the emitter of second insulated gate bipolar transistor Connect the arc maintenance line.
- 7. constant current arc-maintaining device as claimed in claim 1, it is characterised in that the constant current arc-maintaining device further includes：Absorption module, high-frequency coupling coil；The input terminal of the absorption module connects the output cathode of the rectification module, and connects the current collection of the arc maintenance module Pole, the output terminal of the absorption module connects the arc maintenance line, and connects the emitter of the arc maintenance module；The high-frequency coupling The first end of coil connects the output negative pole of the rectification module, and the second end of the high-frequency coupling coil is adapted to described cut The burning torch electrode of cutting mill；When the arc maintenance module turns off, the absorption module absorbs due to voltage spikes.
- 8. constant current arc-maintaining device as claimed in claim 7, it is characterised in that the absorption module includes：5th resistance, the 6th resistance, the 4th capacitance, diode；The first end of 5th resistance connects the output cathode of the rectification module, the second end connection institute of the 5th resistance State the first end of the 6th resistance；The second end of 6th resistance connects the arc maintenance line；The cathode of the diode connects the output cathode of the rectification module, anode connection the 4th electricity of the diode The first end of appearance；The second end of 4th capacitance connects the arc maintenance line；The anode of the diode connects the second end of the 5th resistance.
- A kind of 9. cutting machine, it is characterised in that including：Burning torch, such as claim 1 to 8 any one of them constant current arc-maintaining device.
- 10. cutting machine as claimed in claim 9, it is characterised in that the burning torch includes：Nozzle, electrode；The nozzle of the burning torch connects the arc maintenance line；The electrode of the burning torch connects the second end of the high-frequency coupling coil；Between the electrode for connecting the nozzle of the burning torch of the arc maintenance line and the burning torch of the second end of the connection high-frequency coupling coil Electric arc is produced by high-frequency discharge.
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| CN201711283224.8A CN108031960B (en) | 2017-12-07 | 2017-12-07 | Constant-current arc maintaining device and cutting machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711283224.8A CN108031960B (en) | 2017-12-07 | 2017-12-07 | Constant-current arc maintaining device and cutting machine |
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| CN108031960A true CN108031960A (en) | 2018-05-15 |
| CN108031960B CN108031960B (en) | 2023-06-23 |
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| CN108031960B (en) | 2023-06-23 |
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