CN101477352A - Automatic regulation method of numerical control plasma cutting gun - Google Patents
Automatic regulation method of numerical control plasma cutting gun Download PDFInfo
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- CN101477352A CN101477352A CN 200810203838 CN200810203838A CN101477352A CN 101477352 A CN101477352 A CN 101477352A CN 200810203838 CN200810203838 CN 200810203838 CN 200810203838 A CN200810203838 A CN 200810203838A CN 101477352 A CN101477352 A CN 101477352A
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Abstract
The invention relates to a method for automatically adjusting a cutting gun, which is characterized by comprising the following steps: the arc voltage variation is acquired and sent into a singlechip which is effectively isolated from a cutting power supply; the singlechip automatically generates the voltage value of an optimum cutting arc and calculates the cutting upper control voltage U1, the cutting lower control voltage U2 and a sampling voltage signal U3; when the U1 is more than the U3 which is more than the U2, the cutting gun is not adjusted; when the U1 is less than the U3, the cutting gun is descended; and when the U2 is more than the U3, the cutting gun is ascended. The method greatly reduces the labor intensity of field operators, improves the cutting quality, has good control precision, particularly can automatically generate a cutting height control domain according to the field conditions, and realizes control of an optimum cutting domain of a plasma arc.
Description
Technical field
The present invention relates to a kind of cutting gun Automatic adjustment method, relate in particular to a kind of cutting gun Automatic adjustment method of digital controlling plasma.
Background technology
Plasma-arc is a kind of compression arc of high-energy-density, and it is actuating medium with the pressure gas, by being compressed plasma-arc that gas ionization forms high temperature and high speed with metal molten and form bright and clean otch.Wish that from cutting angle cutting gun and workpiece distance is near more good more, guarantee that cutting gun do not run into workpiece simultaneously again.And plasma-arc has the electrical impedance effect, and its impedance determines under the situation at sheet metal thickness and cutting gun and other cutting technique parameters, mainly along with cutting gun and workpiece variable in distance and change.The electric current of this variable effect electric arc and voltage, the electric current of electric arc and change in voltage have influenced effective cutting thickness of electric arc conversely speaking.
And in actual cutting process,, make cutting may be summarized to be upward slope cutting and descending cutting because sheet material inevitably has distortion, in order to guarantee cut quality, cutting gun must be adjusted with stable arc up and down and cut in range of normal value.
Advantages such as the digital controlling plasma cutting is fast with its cutting speed, workpiece deformation is little, cutting accuracy is good, thin metal blank robotization cutting in being widely used for. and very important in the height distance control of cutting process ionic medium cutting gun and workpiece, it not only causes plasma-arc parameter (U, I) variation, and directly influencing cut quality. present domestic digital controlling plasma cutting-height control is generally realized by mimic channel, though its circuit is simple, cost is low, but also exist control accuracy low, the fluctuation of control altitude range is big, often needs the shortcoming of manual adjustments.
Summary of the invention
The objective of the invention is to propose a kind of cutting gun Automatic adjustment method, solve the shortcoming that control accuracy is low in the prior art, the range of control fluctuation is big.
For achieving the above object, the present invention adopts following technical scheme:
A kind of cutting gun Automatic adjustment method comprises the steps:
Gather arc voltage variation and send into single-chip microcomputer, and effectively isolate with cutting power supply;
Single-chip microcomputer generates the magnitude of voltage of optimum cutting arc automatically, and calculates cutting upper control voltage U1, cutting lower control voltage U2, sampled voltage signal U3;
Work as U1〉U3〉U2, cutting gun is not adjusted; As U1＜U3, cutting gun descends; Work as U2〉U3, cutting gun rises.
Further, adopt the pulse width alignment circuit of band direction control to gather arc voltage variation.
Further, described optimum voltage value is calculated by single-chip microcomputer sample mean in initial 1～2 second of normal cutting and is determined.
The present invention has alleviated the execute-in-place working strength of workers greatly, having improved cut quality. control accuracy of the present invention is good, particularly can generate the cutting-height control domain automatically, realize the control of plasma-arc cutting best domain, have very high practical value according to field condition.
Description of drawings
Fig. 1 is a preferred embodiment synoptic diagram of the present invention.
Fig. 2 is the control domain schematic diagram of h of the present invention.
Fig. 3 is the synoptic diagram of drive circuit module in apparatus of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described:
A kind of cutting gun Automatic adjustment method comprises the steps:
1) gathers arc voltage variation and send into single-chip microcomputer, and effectively isolate with cutting power supply;
2) single-chip microcomputer generates the magnitude of voltage of optimum cutting arc automatically, and calculates cutting upper control voltage U1, cutting lower control voltage U2, sampled voltage signal U3;
3) work as U1〉U3〉U2, cutting gun is not adjusted; As U1＜U3, cutting gun descends; Work as U2〉U3, cutting gun rises.
Described step 1 adopts the pulse width alignment circuit of band direction control to gather arc voltage variation.
Optimum voltage value in the described step 2 is calculated by single-chip microcomputer sample mean in initial 1～2 second of normal cutting and is determined.
Electric arc changes the design in allowed band territory, has directly reflected the sensitivity and the precision of designed controlled system with self-regulation. and scope is too little, and sensitivity is too high, can cause cutting gun frequently to adjust in cutting process; The scope territory is too big, it is too blunt that then cutting gun is regulated meeting, cutting gun is run into cut workpiece or easily away from cut workpiece. by δ=λ+h+1 as can be known, λ, the 1st is certain in the cutting, the variation of h depends on that electric arc changes so. in apparatus of the present invention the sampling of power taking arc voltage, and its this control system of control domain accuracy affects precision.
As shown in Figure 1, near the U0 a zonule (U0+ δ U, U0-δ U) for cutting the arc voltage value up and down of best domain correspondence, when regulation and control system detects arc voltage Ui〉during U0+ δ U, start cutting head motor downward modulation cutting gun, rotating speed of motor is changed by the size of n=Ui-(U0+ δ U); Otherwise, when Ui＜U0-δ U, raise cutting gun, rotating speed of motor is changed by the size of n=(U0-δ U)-Ui, until U0+ δ U〉Ui〉U0-δ U. it should be noted that by formula (1) as can be known, under the constant situation of cutting speed, this optimum voltage value U0 is influenced by cutting gun and workpiece distance, power network fluctuation and nozzle mismachining tolerance etc., U0 can change to some extent in each striking cutting process, and therefore, the value of U0 is calculated by single-chip microcomputer sample mean in initial 1～2 second of normal cutting and determined.
On plasma cutting power supply, obtain voltage variety with bleeder circuit, handle through voltage signal, photoelectricity is sent into single-chip microcomputer after isolating, receive the normal cutoff signal of success of the cutting machine PC main frame starting the arc when single-chip microcomputer after, the average back of a plurality of voltage datas of sampling initial cut is as optimum voltage value U0, established δ U in advance according to technology, automatically generate control domain by single-chip microcomputer, on its cutting upper control voltage U=U0+ δ U, under the lower control voltage U=U0-δ U. sampled voltage signal Ui then is a control signal, when under the U＜Ui＜U on, then the cutting head is suitable in real time in explanation, must not adjust; As Ui〉when U was last, cutting gun needed to descend, and its decline rate is by the size control of the last value of δ=Ui-U; When Ui＜U following time, cutting gun needs to rise, its ascending velocity by under δ=U-size of Ui value controls.
As shown in Figure 3, be delivery outlet with the PB of D8255 parallel port, PB1 and PB0 make control bit, when PB mouth output 02H, 4 of 7,4LS,125 four bus buffers
#Triple gate is opened, and makes the K4 closure, in like manner, and 2
#Triple gate output " 0 " makes 1
#Triple gate is also opened, so switching transistor K1 conducting, promptly, the K1 closure. transistor switch K1 and K4 drive two Darlington power tubes respectively, and motor just changes, otherwise, when PB mouth output 01H, K2 and K3 closure, the motor counter-rotating, the reason that impact damper 74LS125 control end connects is not make power supply short circuit when guaranteeing error code.
Because this device is on numerical control plasma cutting machine, suffered interference is many-sided. mainly be the active or passive interference that Disturbance in Power Net, cutting power supply disturb, external environment condition is disturbed and total system is interior. therefore, in system design, take necessary interference protection measure.
1) power configuration: adopt isolating transformer to reduce coupling capacitance between primary and secondary coil, improve its anti-common mode interference; Adopt the low-pass filter elimination to be higher than the higher hamonic wave of civil power first-harmonic to improve power supply wave shape; Adopt the switch integrated power supply to the separately power supply of different parts.
2) signalling channel interference protection measure: all inputs, output interface all adopt the photoelectricity coupled circuit, with the interference of prevention from signalling channel, and computer power supply and interface power supply are separated with ground.
3) preparation of design of Grounding Connections and decoupling capacitance: since numerical control plasma cutting machine methodically, casing ground (the earth), digitally (logically) and simulate etc., to this, these ground wires are separately connect, and strengthen the ground connection area as far as possible. simultaneously, at each key position configuration decoupling capacitance of host printed circuit board.
4) owing to plasma cuts in starting the arc process, power supply has greater impact to electrical network, and the high-frequency electromagnetic interference is very strong, therefore, must disconnect with cutting power supply at starting the arc stage system sample circuit, system is only in the starting the arc later and could devote oneself to work automatically when normally cutting.
The foregoing description provides to those of ordinary skills and realizes or use of the present invention; those of ordinary skills can be without departing from the invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (3)
1, a kind of cutting gun Automatic adjustment method is characterized in that comprising the steps:
1) gathers arc voltage variation and send into single-chip microcomputer, and effectively isolate with cutting power supply;
2) single-chip microcomputer generates the magnitude of voltage of optimum cutting arc automatically, and calculates cutting upper control voltage U1, cutting lower control voltage U2, sampled voltage signal U3;
3) work as U1〉U3〉U2, cutting gun is not adjusted; As U1＜U3, cutting gun descends; Work as U2〉U3, cutting gun rises.
2, a kind of cutting gun Automatic adjustment method as claimed in claim 1 is characterized in that: described step 1 adopts the pulse width alignment circuit of band direction control to gather arc voltage variation.
3, a kind of cutting gun Automatic adjustment method as claimed in claim 1 is characterized in that: the optimum voltage value in the described step 2 is calculated by single-chip microcomputer sample mean in initial 1～2 second of normal cutting and is determined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810203838 CN101477352A (en) | 2008-12-02 | 2008-12-02 | Automatic regulation method of numerical control plasma cutting gun |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810203838 CN101477352A (en) | 2008-12-02 | 2008-12-02 | Automatic regulation method of numerical control plasma cutting gun |
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| CN101477352A true CN101477352A (en) | 2009-07-08 |
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| CN 200810203838 Pending CN101477352A (en) | 2008-12-02 | 2008-12-02 | Automatic regulation method of numerical control plasma cutting gun |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111805066A (en) * | 2020-07-21 | 2020-10-23 | 常州九圣焊割设备股份有限公司 | Plasma arc voltage height adjusting system and using method thereof |
| CN112388103A (en) * | 2020-11-07 | 2021-02-23 | 广东韶钢松山股份有限公司 | Cutting gun control method of flame cutting machine, readable storage medium and flame cutting machine |
-
2008
- 2008-12-02 CN CN 200810203838 patent/CN101477352A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111805066A (en) * | 2020-07-21 | 2020-10-23 | 常州九圣焊割设备股份有限公司 | Plasma arc voltage height adjusting system and using method thereof |
| CN111805066B (en) * | 2020-07-21 | 2022-04-05 | 常州九圣焊割设备股份有限公司 | Plasma arc voltage height adjusting system and using method thereof |
| CN112388103A (en) * | 2020-11-07 | 2021-02-23 | 广东韶钢松山股份有限公司 | Cutting gun control method of flame cutting machine, readable storage medium and flame cutting machine |
| CN112388103B (en) * | 2020-11-07 | 2022-07-29 | 广东韶钢松山股份有限公司 | Flame cutting machine cutting gun control method, readable storage medium and flame cutting machine |
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Open date: 20090708 |