CN106695094B - Plasma cut corner Source Current Control system - Google Patents
Plasma cut corner Source Current Control system Download PDFInfo
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- CN106695094B CN106695094B CN201710022238.8A CN201710022238A CN106695094B CN 106695094 B CN106695094 B CN 106695094B CN 201710022238 A CN201710022238 A CN 201710022238A CN 106695094 B CN106695094 B CN 106695094B
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- resistance
- photoelectric coupler
- cutting
- height
- precision photoelectric
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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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- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention belongs to plasma cutting technique fields, more particularly to a kind of plasma cut corner Source Current Control system, it include: the single-chip microcontroller of Height-adjusting device, precision photoelectric coupler, it covers the current sensor on cutting current line and adjusts resistance R2, R3, one pin of the single-chip microcontroller of Height-adjusting device connects precision photoelectric coupler, resistance R3 is adjusted to connect with after precision photoelectric coupler parallel connection with adjusting resistance R2, the partial pressure value of resistance after adjusting resistance R3 and linear coupler parallel connection is Vref, single-chip microcontroller receives after digital control system is sent to the turning signal of Height-adjusting device, the pin of single-chip microcontroller issues pwm pulse and is loaded into precision photoelectric coupler input terminal, change the resistance of the precision photoelectric coupler output end, to reduce the cutting current of corner's cutting.The beneficial effects of the present invention are: the single-chip microcontroller using Height-adjusting device provides pwm pulse signal to precision photoelectric coupler, turning cutting current is reduced, processes burn phenomenon so as to improve turning.
Description
Technical field
The invention belongs to plasma cutting technique fields, and in particular to a kind of plasma cut corner Source Current Control
System.
Background technique
Plasma cut is applied using plasma arc as the cutting method of the high energy melting cutting of heat source, has cutting speed
The advantages that degree is fast, the heat affected area of notch is narrow, workpiece deformation is small, cutting accuracy is good is widely used in sheet metal automation and cuts
It cuts.But higher and higher today, plasma cut burn surface after turning slows are being required sheet metal cut quality
Expand, since turning acceleration improves and then the tracking altitude of cutting torch is caused to decline, and Height-adjusting device is made to stop height-regulating method to subtract
Few slack-off burn, has been difficult to meet the requirement of cut quality, cutting efficiency.
In cutting process, the control of the height distance of plasma cutting gun and workpiece is critically important, cutting speed and it is equal from
In the case that sub- nozzle of cutting torch size is certain, the electric current and voltage of arc column and effective cutting thickness have proportional relationship.Cause
This, after plasma power supply sets up electric current, arc voltage is directly proportional to cutting thickness, has the spy of constant current in view of plasma power supply
Property, the height of plasma cutting-torch nozzle distance cut board material determines arc voltage, also just determines cutting thickness.Different
Torch height corresponds to different plate cutting thickness, so that control to torch height and tracking become and directly affect plate and cut
Cut the key of quality.The arc voltage of cutting follows the rule of the height change of cutting torch and plate to be under fixed speed: when
When height of the cutting torch away from plate increases, arc voltage rises；When height of the cutting torch away from plate reduces, arc voltage decline.Arc
Voltage height controller is exactly the variation by detecting arc voltage, controlled by controlling the lifting motor of cutting torch cutting torch and plate away from
From remaining unchanged arc voltage, torch height also remains unchanged simultaneously.
But this tracked using arc voltage adjusts current density indirectly, to guarantee the side of joint-cutting size and heat affected area size
Method can cause joint-cutting to become in the case where cutting the needs such as rectangle and turning round due to the presence of turn acceleration and the decline of speed
Big and burn phenomenon, common practice is that corner stops Height-adjusting device operation at present, prevents from drawing since turning acceleration exists
The Height-adjusting device tracking risen is lower to plant phenomenon, but the effect is unsatisfactory.
The circuit diagram of the cutting power supply of plasma cutting machine is as shown in Figure 1, by adjusting slide rheostat Rp pointer at present
Position adjust the resistance value of partial ohmic value R2 and lower partial ohmic value R3 thereon, wherein Vref value is the partial pressure of resistance R3
It is worth, in normal cutting process, the voltage for covering the current sensor both ends on cutting current line is equal to Vref, guarantees that arc voltage is protected
It holds constant.
Summary of the invention
The purpose of the present invention is overcome plasma cut corner existing in the prior art be easy to appear joint-cutting become larger and
The defect of burn provides a kind of Source Current Control system of plasma cut corner that can improve cutting corner burn phenomenon
System.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of plasma cut corner Source Current Control system, it is characterised in that: include: Height-adjusting device single-chip microcontroller,
Precision photoelectric coupler covers the current sensor on cutting current line and adjusts resistance R2, R3, the monolithic of the Height-adjusting device
One pin of machine connects precision photoelectric coupler, after the adjustings resistance R3 is in parallel with precision photoelectric coupler with adjusting resistance
The partial pressure value of R2 series connection, the resistance after adjusting resistance R3 and precision photoelectric coupler parallel connection is Vref, and the single-chip microcontroller receives
After digital control system is sent to the turning signal of Height-adjusting device, the pin of single-chip microcontroller issues pwm pulse and is loaded into precision photoelectric coupler
Input terminal changes the resistance of the precision photoelectric coupler output end, and plasma cutting machine, which moves to, needs turning cut place, is turned up
Device stops being turned up, and the voltage for covering the current sensor both ends on cutting current line is U, and U is compared with Vref, comparison signal t
Comparison signal t is fed back to the pwm pulse generator for generating the main power source of cutting current, and adjusts main power source by=U-Vref
The duty ratio of pwm pulse signal, until the voltage for generating current sensor is equal with Vref, i.e. U=Vref is turned with reducing
The cutting current cut at angle.
Further, the P1.0 pin of the single-chip microcontroller connects digital control system, the P2.0 pin connecting line of the single-chip microcontroller
The light emitting diode of property photoelectrical coupler input terminal is connect after the light emitting diode series limiting resistor R1 with power Vcc；Institute
The triode for stating precision photoelectric coupler output end is connected with after adjusting resistance R3 parallel connection with adjusting resistance R2.
Further, described to adjust two parts that resistance R2 and R3 are the segmentation of a slide rheostat sliding end, the cunning
Move the output end of rheostatic sliding end connection precision photoelectric coupler.
Further, the control system further includes Height-adjusting device man-machine interface, and monolithic is arranged by Height-adjusting device man-machine interface
Width between the pulse width and arteries and veins of the pwm pulse signal that machine generates.
A kind of beneficial effect of plasma cut corner Source Current Control system of the invention is:
1, partial pressure is adjusted a resistance R3 precision photoelectric coupler in parallel by the present invention, is generated using the single-chip microcontroller of Height-adjusting device
Pwm pulse signal powers to precision photoelectric coupler, makes to precision photoelectric coupler for pulse voltage when needing to cut corner
Precision photoelectric coupler has output resistance, makes its partial pressure after adjusting the output resistance of resistance R3 parallel connection precision photoelectric coupler
Value Vref becomes smaller, and the voltage U of the main power source of cutting current passes through the pwm pulse generator tune of main power source compared with Vref
Section adjusts the duty ratio of pwm pulse signal to adjust the voltage U of main power source, until U=Vref.According to the number for generating cutting movement
Control system, to the stopping turning signal of Height-adjusting device, not only stops height-regulating movement in the inside of type automatic height adjusting device in cutting corner,
And cutting current can be reduced during stopping being turned up, burn phenomenon is processed so as to improve turning.
2, width between the pulse width and arteries and veins of the pulse signal generated using the man-machine interface of Height-adjusting device to single-chip microcontroller, to adjust
The size of the output resistance of precision photoelectric coupler is saved, partial pressure value Vref is adjusted, to adjust the cutting current of cutting corner
Size, cost is small, and effect is obvious.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is that plasma current cutting power supply adjusts circuit in the prior art；
Fig. 2 is plasma cut corner Source Current Control system circuit diagram of the invention；
Wherein: 1. digital control systems；2. single-chip microcontroller；3. precision photoelectric coupler.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
The specific embodiment of plasma cut corner Source Current Control system of the invention as shown in Figure 2, comprising:
The single-chip microcontroller 2 of Height-adjusting device, precision photoelectric coupler 3, cover the current sensor on cutting current line and adjust resistance R2,
A pin of R3, the single-chip microcontroller 2 of Height-adjusting device connect precision photoelectric coupler 3, adjust resistance R3 and precision photoelectric coupler 3 simultaneously
It connects after connection with adjusting resistance R2, the partial pressure value of the resistance after adjusting resistance R3 and precision photoelectric coupler parallel connection is Vref, single
Piece machine 2 receives after digital control system 1 is sent to the turning signal of Height-adjusting device, and the pin of single-chip microcontroller 2 issues pwm pulse and is loaded into line
Property 3 input terminal of photoelectrical coupler, changes the resistance of 3 output end of precision photoelectric coupler, plasma cutting machine moves to needs
Turning cut place, Height-adjusting device stop being turned up, and the voltage at current sensor both ends is U, and U is compared with Vref, comparison signal t=
Comparison signal t is fed back to the pwm pulse generator for generating the main power source of cutting current, and adjusts the PWM of main power source by U-Vref
The duty ratio of pulse signal, until making the voltage of current sensor generation equal with Vref, i.e. U=Vref, to reduce turning
Locate the cutting current of cutting.
The P1.0 pin of single-chip microcontroller 2 connects digital control system 1, single-chip microcontroller 2
P2.0 pin connects the light emitting diode of 3 input terminal of precision photoelectric coupler, light emitting diode series limiting resistor
It is connect after R1 with power Vcc；The triode of 3 output end of precision photoelectric coupler with adjust resistance R3 it is in parallel after with adjusting resistance R2
Series connection.
Different cutting currents is needed in order to adapt to the factors such as different steel plate thickness, adjusting resistance R2 and R3 is a cunning
Two parts of dynamic rheostat sliding end segmentation, the output end of the sliding end connection precision photoelectric coupler 3 of slide rheostat, are adjusted
The position of the sliding end slide plate of slide rheostat can adjust the size of Vref, i.e., the electric current being arranged on adjusting cutting current line passes
The size of the voltage of sensor, and then adjust the size of cutting current.
By width between the pulse width and arteries and veins of the pwm pulse signal of the Height-adjusting device man-machine interface setting generation of single-chip microcontroller 2, adjust
The man-machine interface of high device includes display screen and keyboard, inputs width between pwm pulse width and arteries and veins by keyboard.
Specifically, when straight cuts steel plate, single-chip microcontroller does not generate pulse signal, and the output end of precision photoelectric coupler is suitable
In insulation, Vref is the partial pressure value for adjusting resistance R3, when needing to cut turning, digital control system 1 can issue turning signal to
Single-chip microcontroller 2, single-chip microcontroller 2, which controls height-regulating mechanism, to be stopped being turned up, and turning signal simultaneously triggers the sending pwm pulse signal of single-chip microcontroller 2 to line
Property photoelectrical coupler 3, and then change precision photoelectric coupler 3 output end resistance, the output resistance of precision photoelectric coupler
It is less than the value for adjusting resistance R3 with all-in resistance of the adjusting resistance R3 after in parallel, is equivalent to and becomes with the concatenated resistance of adjusting resistance R2
It is small, so that Vref becomes smaller, at this point, t=U-Vref > 0, comparison signal t feed back to the pwm pulse signal generator of main power source, and
The duty ratio for adjusting the pulse signal of the output voltage of main power source, makes it become smaller, to reduce the output voltage U of main power source, repeatedly
Comparison signal is fed back into the pwm pulse signal generator of main power source until comparison signal t=0.
By width between the pulse width and arteries and veins of the pwm pulse signal of keyboard input single-chip microcontroller 2, to adapt to different cutting feelings
Condition or different-thickness steel plate turning need the demand of different cutting current sizes when cutting.
It should be appreciated that described above, the specific embodiments are only for explaining the present invention, is not intended to limit the present invention.By
The obvious changes or variations that spirit of the invention is extended out are still in the protection scope of this invention.
Claims (4)
1. a kind of plasma cut corner Source Current Control system, it is characterised in that: include: Height-adjusting device single-chip microcontroller (2),
Precision photoelectric coupler (3) covers the current sensor on cutting current line and adjusts resistance R2, R3, the Height-adjusting device
One pin of single-chip microcontroller (2) connects precision photoelectric coupler (3), and the adjusting resistance R3 and precision photoelectric coupler (3) are simultaneously
It connects after connection with adjusting resistance R2, the partial pressure value of the resistance after adjusting resistance R3 and precision photoelectric coupler (3) parallel connection is Vref,
The single-chip microcontroller (2) receives after digital control system (1) is sent to the turning signal of Height-adjusting device, and the pin of single-chip microcontroller (2) issues PWM
Pulse is loaded into precision photoelectric coupler (3) input terminal, changes the resistance of precision photoelectric coupler (3) output end, plasma
Cutting machine, which moves to, needs turning cut place, and Height-adjusting device stops being turned up, and covers the electricity at the current sensor both ends on cutting current line
Pressure is U, and U is compared with Vref, comparison signal t=U-Vref, and comparison signal t is fed back to the main power source for generating cutting current
Pwm pulse generator, and the duty ratio of the pwm pulse signal of main power source is adjusted, until the electricity for generating current sensor
, i.e. U=Vref equal with Vref is pressed, to reduce the cutting current of corner's cutting.
2. plasma cut corner Source Current Control system according to claim 1, it is characterised in that: the monolithic
The P1.0 pin of machine (2) connects digital control system (1), and P2.0 pin connection precision photoelectric coupler (3) of the single-chip microcontroller (2) is defeated
Enter the light emitting diode at end, is connect after light emitting diode series limiting resistor R1 with power Vcc；The precision photoelectric coupler
(3) it connects after the triode of output end is in parallel with adjusting resistance R3 with adjusting resistance R2.
3. plasma cut corner Source Current Control system according to claim 2, it is characterised in that: the adjusting
Resistance R2 and R3 are two parts of slide rheostat sliding end segmentation, and the sliding end of the slide rheostat connects linear light
The output end of electric coupler (3).
4. plasma cut corner Source Current Control system according to claim 1-3, it is characterised in that:
The control system further includes Height-adjusting device man-machine interface, and the PWM that the single-chip microcontroller (2) generates is arranged by Height-adjusting device man-machine interface
Width between the pulse width and arteries and veins of pulse signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710022238.8A CN106695094B (en) | 2017-01-12 | 2017-01-12 | Plasma cut corner Source Current Control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710022238.8A CN106695094B (en) | 2017-01-12 | 2017-01-12 | Plasma cut corner Source Current Control system |
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| Publication Number | Publication Date |
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| CN106695094A CN106695094A (en) | 2017-05-24 |
| CN106695094B true CN106695094B (en) | 2019-02-15 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5148001A (en) * | 1986-12-11 | 1992-09-15 | The Lincoln Electric Company | System and method of short circuiting arc welding |
| JPH08132243A (en) * | 1994-11-02 | 1996-05-28 | Komatsu Ltd | Torch height control device in plasma cutting equipment |
| JP2000317639A (en) * | 1999-05-12 | 2000-11-21 | Komatsu Ltd | Method and device for plasma cutting |
| CN201143594Y (en) * | 2007-12-13 | 2008-11-05 | 哈尔滨理工大学 | Inversion type plasma cutting power supply controller based on DSP digitalization |
| CN202106137U (en) * | 2011-06-13 | 2012-01-11 | 常州泛洋电气设备有限公司 | Numerical control controller of plasma cutting machine |
| CN204148709U (en) * | 2014-10-17 | 2015-02-11 | 徐伟 | A kind of arc voltage Height-adjusting device |
| CN205166145U (en) * | 2015-08-04 | 2016-04-20 | 广州奥凌数控科技有限公司 | Numerical control plasma cutting machine's control circuit |
-
2017
- 2017-01-12 CN CN201710022238.8A patent/CN106695094B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5148001A (en) * | 1986-12-11 | 1992-09-15 | The Lincoln Electric Company | System and method of short circuiting arc welding |
| JPH08132243A (en) * | 1994-11-02 | 1996-05-28 | Komatsu Ltd | Torch height control device in plasma cutting equipment |
| JP2000317639A (en) * | 1999-05-12 | 2000-11-21 | Komatsu Ltd | Method and device for plasma cutting |
| CN201143594Y (en) * | 2007-12-13 | 2008-11-05 | 哈尔滨理工大学 | Inversion type plasma cutting power supply controller based on DSP digitalization |
| CN202106137U (en) * | 2011-06-13 | 2012-01-11 | 常州泛洋电气设备有限公司 | Numerical control controller of plasma cutting machine |
| CN204148709U (en) * | 2014-10-17 | 2015-02-11 | 徐伟 | A kind of arc voltage Height-adjusting device |
| CN205166145U (en) * | 2015-08-04 | 2016-04-20 | 广州奥凌数控科技有限公司 | Numerical control plasma cutting machine's control circuit |
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| CN106695094A (en) | 2017-05-24 |
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