CN106808798B - A kind of ink droplet spray regime for piezoelectric type printing head adjusts system and method - Google Patents
A kind of ink droplet spray regime for piezoelectric type printing head adjusts system and method Download PDFInfo
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- CN106808798B CN106808798B CN201610370832.1A CN201610370832A CN106808798B CN 106808798 B CN106808798 B CN 106808798B CN 201610370832 A CN201610370832 A CN 201610370832A CN 106808798 B CN106808798 B CN 106808798B
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- ink droplet
- printing head
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- type printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/12—Ink jet characterised by jet control testing or correcting charge or deflection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/125—Sensors, e.g. deflection sensors
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- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Ink Jet (AREA)
Abstract
The present invention provides a kind of ink droplet spray regimes for piezoelectric type printing head to adjust system and method, belongs to inkjet printing technology field.The system includes computer computing platform, nozzle drive control device, piezoelectric type printing head and CCD camera；Nozzle drive control device one end is connect with computer computing platform, and the other end is connect with the piezoelectric type printing head；The CCD camera is connect with computer computing platform；The nozzle drive control device generates the drive signal being suitable for needed for piezoelectric type printing head, is carried out at the same time the timing control of drive signal；The piezoelectric type printing head generates fluctuation under the action of the drive signal that nozzle drive control device provides in black chamber, and wave propagation to spray orifice forms ink droplet；The state for the ink droplet that the CCD camera capture piezoelectric type printing head ejects.
Description
Technical field
The invention belongs to inkjet printing technology fields, and in particular to a kind of ink droplet spurting for piezoelectric type printing head
State adjusts system and method.
Background technology
Inkjet printing technology be it is a kind of under the control of the computer, by the way that the drop of picoliters magnitude is injected in a variety of printing bases
On material, high speed, the dot matrix of high quality, patterned no plate printing technology are realized.Technique, which has, pollutes small, energy consumption
Low, processing technology is simple, it is not necessary that the processed edges such as product of the processing with stereochemical structure are contacted, be suitable for base material.Currently, can
Can also have certain physical characteristic, chemical characteristic for the ink of printing.Different from traditional document print, inkjet printing technology
Nowadays have become the technological means of a low-cost and high-precision in small scale in circuitry retrofit, and be considered as not sending a telegram here
One important channel of road processing industry industry development.Currently, in commercial Application, it is the widest to the use of piezoelectric type printing head
It is general.Since inkjet printing technology is various in technology field applicable cases, piezoelectric type nozzle must under different working conditions with
Meet different application demands.For this purpose, industrial most common method is according to selected piezoelectric type printing head parameter, institute
The ink characteristics that use and parameter in the adjustment nozzle drive waveforms such as conditions dictate is dripped to jet ink, to meet different printings point
The requirement of resolution, printing effect and print quality.
But due to including many adjustable parameters, the tune based on artificial experience or based on grid in the drive waveforms of nozzle
Perfect square formula is not only time-consuming and laborious, but also during the use of nozzle, (is mainly that piezoelectric ceramics is tired with the drift of nozzle state
Caused by labor phenomenon), nozzle state is difficult to be consistent for a long time, significantly limits the application of inkjet printing technology.
Invention content
It is an object of the invention to solve above-mentioned problem existing in the prior art, provide a kind of for piezoelectric type printing spray
Head ink droplet spray regime adjust system and method, overcome to piezoelectric type printing head adjustment it is time-consuming it is long, can not print
Nozzle state drift situation is quickly tracked in journey, realization quick and precisely adjusts piezoelectric type printing head, while can realize pair
The function of printing head real-time tracking adjustment.
The present invention is achieved by the following technical solutions：
A kind of ink droplet spray regime for piezoelectric type printing head adjusts system, including computer computing platform, nozzle
Drive control device, piezoelectric type printing head and CCD camera；
Nozzle drive control device one end is connect with computer computing platform, the other end and the piezoelectric type printing head
Connection；
The CCD camera is connect with computer computing platform；
The nozzle drive control device generates the drive signal being suitable for needed for piezoelectric type printing head, is carried out at the same time driving
The timing control of signal；
The piezoelectric type printing head generates under the action of the drive signal that nozzle drive control device provides in black chamber
Fluctuation, wave propagation to spray orifice form ink droplet；
The state for the ink droplet that the CCD camera capture piezoelectric type printing head ejects；
The computer computing platform carries out the ink droplet that CCD camera captures the characterization ginseng that parameter extraction obtains ink droplet
Number, is calculated the ink droplet drive waveforms characterization parameter of optimization, the ink droplet drive waveforms characterization parameter of the optimization is passed to spray
Head drive control device controls piezoelectric type printing head by nozzle drive control device and squeezes out ink droplet, realizes to print piezoelectric type and spray
The real-time adjustment of head.
The CCD camera is beaten mounted on the front of piezoelectric type printing head position on the lower side with piezoelectric type
The horizontal distance for printing nozzle is 0.5-0.6 meters, and the vertical range with piezoelectric type printing head is at 0.3-0.5 meters.
The CCD camera uses high-speed industrial CCD camera, and minimum exposure time is in musec order or following；
The amplification factor of the front end object lens of the CCD camera is at 120 times or more.
The computer computing platform include ink droplet state parameter extraction unit, drive waveforms characterization parameter extraction unit and
Adjustment unit with feedback mechanism, it is specific as follows：
The ink droplet state parameter extraction unit uses the gray level image that Threshold Segmentation Algorithm is obtained from the CCD camera
In extract the profile of ink droplet, the physical distance corresponding to each pixel is determined, based on the absolute axial symmetry of ink droplet it is assumed that calculating
The quantity of ink drop size, trailing length and satellite ink droplet；
The drive waveforms characterization parameter extraction unit is according to the quantity of the ink drop size, trailing length and satellite ink droplet
And piezoelectric type printing head operation principle, record the drive waveforms characterization parameter corresponding to the ink droplet；
The adjustment unit with feedback mechanism is according to the corresponding drive waveforms characterization parameter of current ink droplet and phase
The gap for hoping the drive waveforms characterization parameter of ink droplet, is optimized using artificial bee colony algorithm, show that the ink droplet of an optimization drives
Dynamic waveform characterization parameter, nozzle drive control device is passed to by the ink droplet drive waveforms characterization parameter of the optimization.
The nozzle drive control device includes shell, and being equipped with driver CAN bus in the top of the shell communicates groove
Groove is exported with piezoelectric type printing head signal wire；
Driver control module is housed in the shell, which includes microcontroller circuit, CAN total
Circuit and power circuit occur for line telecommunication circuit, drive signal；
The microcontroller circuit includes STC12C5A microcontrollers and its peripheral circuit, is received and is calculated by CAN bus
The voltage and timing control of drive waveforms driving parameter and piezoelectric type printing head that machine computing platform is sent；
The CAN bus telecommunication circuit includes TJA1050 and its peripheral circuit, realizes the string of the STC12C5A microcontrollers
The physical transformation of row communication interface and CAN bus communication interface；
It is equipped with CAN bus communication interface in the CAN bus telecommunication circuit, passes through the CAN bus and computer
Computing platform is connected, and it is recessed which is located at the communication of the driver CAN bus above nozzle drive control device shell
At slot；
It includes bipolarity serial digital-analog conversion chip AD5752 and its peripheral circuit that circuit, which occurs, for the drive signal, is generated
It is suitable for the required voltage signal of piezoelectric type printing head；
Occur to be equipped with piezoelectric type printing head signal wire output interface on circuit in the drive signal, passes through piezoelectric type
Printing head signal wire is connected with piezoelectric type printing head, which is located at nozzle driving
Piezoelectric type printing head signal wire above controller housing exports groove；
The power circuit includes LM2940 and its peripheral circuit, and system+24V DC power supplies are depressured to+5V, is micro-control
Device circuit, CAN bus telecommunication circuit, drive signal generation circuit and other+5V system power supplies processed.
The time t of Maximum Forward Voltage is risen to by no-voltage when driver control module is receivedrP, Maximum Forward Voltage
VP, Maximum Forward Voltage duration tdP：, drop to by Maximum Forward Voltage the time t of no-voltagefP, no-voltage it is lasting
Time tiWhen, the analog-digital chip AD5752 generates required positive polarity trapezoidal wave；
Drop to the time t of inverse peak voltage by no-voltage when driver control module is receivedrN, inverse peak voltage
VN, inverse peak voltage duration tdN, rise to by inverse peak voltage the time t of no-voltagefN：When, the digital-to-analogue turns
It changes chip AD5752 and generates required negative polarity trapezoidal wave.
The ink droplet spray regime method of adjustment for piezoelectric type printing head realized using the system, including：
(1), the drive waveforms characterization parameter t of ink droplet it is expected in settingrP,VP,tdP,tfP,ti,trN,VN,tdN,tfN；
(2), the ink droplet that piezoelectric type printing head ejects is captured by CCD camera；
(3), ink droplet state parameter is extracted, the ink droplet state parameter includes ink drop size, trailing length and satellite ink droplet
Quantity；
(4), the drive waveforms characterization parameter of current ink droplet is extracted；
(5), the drive waveforms characterization parameter of current ink droplet and the drive waveforms characterization parameter of desired ink droplet are carried out one by one
Compare, if the error of each drive waveforms characterization parameter is receiving in range, by the drive waveforms table of current ink droplet
The drive waveforms characterization parameter of parameter as an optimization is levied, into (7) step；If gap is not receiving in range, into (6)
Step；
(6), the drive waveforms characterization parameter of current ink droplet is optimized using artificial bee colony algorithm, obtains the ink of optimization
Drip drive waveforms characterization parameter；
(7), the drive waveforms characterization parameter of optimization is output to nozzle drive control device；
(8), judge whether to need to it is expected that the drive waveforms characterization parameter of ink droplet is updated, if update, enters
(9) step；It does not update, then returns to (2) step；
(9), it using the drive waveforms characterization parameter of current ink droplet as the drive waveforms characterization parameter of desired ink droplet, then returns
Return (2) step.
In the step (4) during extracting drive waveforms characterization parameter, the evaluation function of setting is as follows,
Wherein, w (1) and w (2) is setting coefficient, and V is current ink drop size, and Vt is it is expected droplet volume, and Ns is satellite ink
Drip quantity.
The drive waveforms characterization parameter needs to meet following conditions：
trP+tdP+tfP+ti+trN+tdN+tfN≤Ts-20us
ti≤2(trP+tdP+tfP)
VP≥VN
VP+VN≤28V
VP,VN≥5V
trP,tdP,tfP,ti,trN,tdN,tfN≥0.1us
trP,tfP,trN,tfN≤0.5us
Wherein, Ts is the work period of piezoelectric type printing head.
Within receiving ranging from positive and negative 5% in the step (5).
Compared with prior art, the beneficial effects of the invention are as follows：The present invention is by high speed CCD camera and combines ink droplet shape
State parameter extraction algorithm, drive waveforms characterization parameter extraction algorithm realize and carry out quick, real-time, standard to ink droplet state of flight
Really calibration；By adjustment algorithm of the foundation with feedback mechanism, adjustment full-automatic to ink droplet state, accurate is realized, is had
Manual operation and invalid operation are reduced to effect, is avoided and is adjusted based on artificial experience or inaccuracy is adjusted based on grid；Together
When, the present invention can quickly track nozzle state drift situation, and be directed to each nozzle fine tune drive waveforms parameter accordingly,
Ensure print quality.
Description of the drawings
Fig. 1 is the structure diagram of present system.
Fig. 2 is nozzle drive control device wiring schematic diagram of the present invention.
Fig. 3 is nozzle drive control device electrical block diagram of the present invention.
Fig. 4 is nozzle drive control device circuit diagram of the present invention.
Fig. 5 is the structural schematic diagram of piezoelectric type printing head.
The schematic diagram of Fig. 6 piezoelectric type printing head drive waveforms.
Fig. 7 is that ink droplet spray regime of the present invention adjusts working-flow figure.
In figure：1 is computer computing platform, and 2 be nozzle drive control device, and 3 be piezoelectric type printing head, and 4 image for CCD
Machine, 5 be ink droplet, and 6 be CAN bus, and 7 be piezoelectric type printing head signal wire, and 8 communicate groove for driver CAN bus, and 9 be pressure
Electric-type printing head signal wire exports groove, and 10 be nozzle drive control device shell.
Specific implementation mode
Present invention is further described in detail below in conjunction with the accompanying drawings：
See Fig. 1, the present invention by the ink droplet spray regime of piezoelectric type printing head adjustment system include CCD camera 4, based on
Calculation machine computing platform 1, nozzle drive control device 2, piezoelectric type printing head 3.
Computer computing platform 1 captures the ink droplet state that piezoelectric type printing head ejects by CCD camera, passes through figure
As processing method acquisition ink droplet state parameter, the characterization corresponding to the ink droplet is extracted according to piezoelectric type printing head operation principle
Parameter.According to the gap of current ink droplet characterization parameter and desired ink droplet characterization parameter, is optimized, obtained using artificial bee colony algorithm
Go out an expected drive waveforms driving parameter, controlling piezoelectric type printing head by nozzle drive control device squeezes out ink droplet, real
Now to the quick and precisely adjustment of piezoelectric type printing head.Meanwhile it can be according to the ink drop formation characteristic after optimization, to it is expected that ink droplet drives
Dynamic waveform parameter is modified, and realizes the purpose adjusted to printing head real-time tracking.
CCD camera 4 is responsible for the ink droplet state that capture piezoelectric type printing head ejects.Computer computing platform 1 is responsible for
Parameter extraction is carried out to collected ink droplet, and then dynamic is realized by the ink-jet parameter intelligent adjustment algorithm with feedback mechanism
Adjustment ink-jet shape in real time.Nozzle drive control device 3, which is responsible for generating, is suitable for voltage signal needed for piezoelectric type printing head, simultaneously
Into the timing control of horizontal-drive signal.Piezoelectric type printing head 3 generates fluctuation, fluctuation under the action of drive waveforms in black chamber
Spray orifice is traveled to, ink droplet is formed.
Specifically, the CCD camera 4 uses high-speed industrial CCD camera, and minimum exposure time will be in musec order
Or hereinafter, in order to avoid causing persistence of vision, influence the identification of ink droplet profile.And front end object lens need to meet amplification factor at 120 times
More than.In actual use, CCD camera should be mounted on position on the lower side immediately ahead of nozzle, from nozzle horizontal distance 0.5-0.6
Rice, the vertical range with piezoelectric type printing head are at 0.3-0.5 meters.
The computer computing platform 1 is ink droplet spray regime adjustment system core part comprising ink droplet state parameter
Extraction unit, drive waveforms characterization parameter extraction unit, the adjustment unit with feedback mechanism, it is specific as follows：
The ink droplet state parameter extraction unit (is directly obtained from CCD camera 4 using Threshold Segmentation Algorithm from gray level image
) in extract the profile of ink droplet, determine that the physical distance corresponding to each pixel (shoots scale under this enlargement ratio first
(1 millimeter of scale has two kinds of 50 deciles and 100 deciles), sees the pixel of a millimeter or half millimeter of corresponding how many image,
It is divided by and is assured that the physical length of a pixel), based on the absolute axial symmetry of ink droplet it is assumed that calculating ink drop size, hangover
Length, these status informations of the quantity of satellite ink droplet (the small ink droplet i.e. around the ink droplet).
The drive waveforms characterization parameter extraction unit according to ink droplet state parameter information, (drag by i.e. above-mentioned ink drop size
The quantity of tail length degree and satellite ink droplet) and piezoelectric type printing head operation principle, extract the drive waveforms corresponding to the ink droplet
Characterization parameter, i.e. 9 characterization parameters, extraction are exactly to record the size of this 9 parameters, this 9 values be by be manually set or
It is arrived by algorithm search.Piezoelectric type printing head can generate fluctuation, wave propagation under the action of drive waveforms in black chamber
To spray orifice, ink droplet is formed.
The adjustment unit with feedback mechanism is according to current ink droplet drive waveforms characterization parameter and expectation ink
The gap for dripping drive waveforms characterization parameter, is optimized using artificial bee colony algorithm, obtains the ink droplet drive waveforms of an optimization
Characterization parameter controls piezoelectric type printing head 3 by nozzle drive control device 2 and squeezes out ink droplet 5.Meanwhile can be according to optimization after
Ink drop formation characteristic (repeats above-mentioned " according to current ink droplet driving wave to it is expected that ink droplet drive waveforms characterization parameter is modified
The gap of shape characterization parameter and desired ink droplet drive waveforms characterization parameter, is optimized using artificial bee colony algorithm, obtains one
The ink droplet drive waveforms characterization parameter of optimization controls piezoelectric type printing head 3 by nozzle drive control device 2 and squeezes out ink droplet 5),
Realize the purpose adjusted to printing head real-time tracking.
As shown in Figure 2, Figure 3 and Figure 4, the ink droplet after the nozzle drive control device 2 optimizes according to computer computing platform 1
Drive waveforms characterization parameter, carries out signal conversion, and generation is suitable for (the i.e. driving letter of voltage signal needed for piezoelectric type printing head 3
Number, drive waveforms characterization parameter refers to the parameters of this voltage signal.), it is carried out at the same time the timing control of drive signal.
There are one rectangle shells 10 for nozzle drive control device 2, and 1 driver is equipped with above the shell 10 of nozzle drive control device 2
CAN bus communicates groove 8 and 1 piezoelectric type printing head signal wire exports groove 9.In the shell 10 of nozzle drive control device 2
Interior that driver control module is housed, which includes microcontroller circuit, CAN bus telecommunication circuit, driving letter
Number circuit and power circuit (as shown in Figure 3) occurs.The microcontroller circuit is by STC12C5A microcontrollers and its peripheral circuit
Composition, the drive waveforms for being responsible for receiving 1 transmission of computer computing platform by CAN bus 6 drive parameter and piezoelectric type printing spray
The voltage and timing control of head.The CAN bus telecommunication circuit is made of TJA1050 and its peripheral circuit, is responsible for realization
The physical transformation of the serial communication interface and CAN bus communication interface of STC12C5A microcontrollers.In the driver control module
CAN bus telecommunication circuit is equipped with 1 CAN bus communication interface (interface being connect with the CAN bus in Fig. 3), passes through CAN
Bus 6 is connected with computer computing platform 1, which is located at the drive of 10 top of nozzle drive control device shell
At dynamic device CAN bus communication groove 8.
Drive signal in the driver control module occur circuit by bipolarity serial digital-analog conversion chip AD5752 and
Its peripheral circuit forms, and responsible generation is suitable for voltage signal needed for piezoelectric type printing head 3.Detailed process is as shown in fig. 6, work as
Driver control module receives the time t that Maximum Forward Voltage is risen to by no-voltagerP, Maximum Forward Voltage VP, it is maximum just
To voltage duration tdP：, drop to by Maximum Forward Voltage the time t of no-voltagefP, no-voltage duration tiWhen,
Analog-digital chip AD5752 generates required positive polarity trapezoidal wave.
Drop to the time t of inverse peak voltage by no-voltage when driver control module is receivedrN, inverse peak voltage
VN, inverse peak voltage duration tdN, rise to by inverse peak voltage the time t of no-voltagefN：When, digital-to-analogue conversion core
Piece AD5752 generates required negative polarity trapezoidal wave.
The drive signal occurs circuit and is equipped with 1 piezoelectric type printing head signal wire output interface, passes through piezoelectric type
Printing head signal wire 7 is connected with piezoelectric type printing head 3, which is located at nozzle drive
At the piezoelectric type printing head signal wire output groove 9 of 10 top of movement controller shell.The power circuit by LM2940 and its
Peripheral circuit forms, and is responsible for system+24V DC power supplies being depressured to+5V, be microcontroller circuit, CAN bus telecommunication circuit,
Circuit and other+5V system power supplies occur for drive signal.
As shown in figure 5, the piezoelectric type printing head 3 is in drive waveforms voltage, (i.e. drive signal occurs what circuit generated
Voltage signal) under the action of can in black chamber generate fluctuation, wave propagation to spray orifice, formation ink droplet.When drive waveforms rising edge
Ink chamber is expanded when acting on piezoelectric ceramics, and when drive waveforms failing edge acts on piezoelectric ceramics, ink chamber is shunk, and so may be used
Reach a crushing failure at high speed effect.Using pressure superposition principle of wave, it is superimposed an acting in opposition behind, reaches and inhibits black chamber
Big ups and downs effect.
As shown in fig. 6, in order to more accurately control ink-jet ink-droplet shape, 9 characterization parameters of drive waveforms are established.I.e.
Drive waveforms can be characterized as nine parameter vector [trP,VP,tdP,tfP,ti,trN,VN,tdN,tfN], meaning difference is as follows：
trP：The time of Maximum Forward Voltage is risen to by no-voltage；
VP：Maximum Forward Voltage；
tdP：Maximum Forward Voltage duration；
tfP：Drop to the time of no-voltage by Maximum Forward Voltage；
ti：No-voltage duration
trN：Drop to the time of inverse peak voltage by no-voltage
VN：Inverse peak voltage
tdN：Inverse peak voltage duration；
tfN：The time of no-voltage is risen to by inverse peak voltage.
In establishing characteristic present parametric procedure, evaluation function need to be set, establishment principle using normalization forms of characterization (under
V and N in formulaS, all measured after this 9 parameter settings),
Wherein, w (1) and w (2) is setting coefficient, and V is current ink drop size, and Vt is it is expected droplet volume, and Ns is satellite ink
Drip quantity.
In the adjustment unit with feedback mechanism, current ink droplet is gradually reduced by artificial bee colony optimization algorithm and is driven
The gap of dynamic waveform characterization parameter and desired ink droplet drive waveforms characterization parameter.It needs to set adjustable parameter in optimization process
Mobility scale cannot make its break bounds, otherwise can not obtain printing effect.In the present embodiment, characterization parameter meets following conditions
(under the premise of meeting following conditions, ink droplet drive waveforms characterization parameter that user's worker bee colony optimization algorithm is optimized)：
trP+tdP+tfP+ti+trN+tdN+tfN≤Ts-20us
ti≤2(trP+tdP+tfP)
VP≥VN
VP+VN≤28V
VP,VN≥5V
trP,tdP,tfP,ti,trN,tdN,tfN≥0.1us
trP,tfP,trN,tfN≤0.5us
Wherein, Ts is the work period of piezoelectric type printing head.
As shown in fig. 7, ink droplet spray regime adjustment working-flow of the present invention is as follows：
(1), setting it is expected ink droplet drive waveforms characterization parameters (before authenticated suitable driving parameter (9 parameters),
The ink droplet of intended shape can be squeezed out according to this 9 parameters.；
(2), the ink droplet that piezoelectric type printing head ejects is captured by CCD camera；
(3), ink droplet state parameter extracts；
(4), drive waveforms characterization parameter extracts；
(5), current ink droplet drive waveforms characterization parameter is compared with desired ink droplet drive waveforms characterization parameter and (it is expected
9 parameters of ink droplet and 9 parameters of current ink droplet are made the difference one by one), if gap is receiving range, (it is every to receive range
The error of one parameter is within positive and negative 5%) in, into (7) step；If gap is not receiving in range, into
(6) step；
(6), artificial bee colony algorithm optimizes current ink droplet drive waveforms characterization parameter and (starts with feedback mechanism
Adjustment cell operation)；
(7), drive waveforms characterization parameter is output to nozzle drive control device；
(8), judge whether to need to it is expected that ink droplet drive waveforms characterization parameter is updated, if update, enter the
(9) step；It does not update, then returns to (2) step, that is, carry out next round acquisition adjustment；
(9), update it is expected that (ink droplet squeezed out before is allowed in desired ink droplet error to ink droplet drive waveforms characterization parameter
Ink droplet in range, but sometimes, according to actual conditions difference, it is possible to which current ink droplet is more suitable for, so at this point, just will current ink
9 parameters of drop are used as desired ink droplet parameter, behind the ink droplet that squeezes out again just using 9 parameters of current ink droplet as standard.), it returns
(2) step is returned, that is, carries out next round acquisition adjustment.
Above-mentioned technical proposal is one embodiment of the present invention, for those skilled in the art, at this
On the basis of disclosure of the invention application process and principle, it is easy to make various types of improvement or deformation, be not limited solely to this
Invent method described in above-mentioned specific implementation mode, therefore previously described mode is only preferred, and and without limitation
The meaning of property.
Claims (8)
1. a kind of ink droplet spray regime for piezoelectric type printing head adjusts system, it is characterised in that：It is described to be used for piezoelectric type
The ink droplet spray regime adjustment system of printing head includes computer computing platform, nozzle drive control device, piezoelectric type printing spray
Head and CCD camera；
Nozzle drive control device one end is connect with computer computing platform, and the other end connects with the piezoelectric type printing head
It connects；
The CCD camera is connect with computer computing platform；
The nozzle drive control device generates the drive signal being suitable for needed for piezoelectric type printing head, is carried out at the same time drive signal
Timing control；
The piezoelectric type printing head generates fluctuation under the action of the drive signal that nozzle drive control device provides in black chamber,
Wave propagation forms ink droplet to spray orifice；
The state for the ink droplet that the CCD camera capture piezoelectric type printing head ejects；
The computer computing platform carries out the ink droplet that CCD camera captures the state parameter that parameter extraction obtains ink droplet,
The ink droplet drive waveforms characterization parameter of optimization is calculated, the ink droplet drive waveforms characterization parameter of the optimization, which is passed to nozzle, to be driven
Movement controller controls piezoelectric type printing head by nozzle drive control device and squeezes out ink droplet, realizes to piezoelectric type printing head
Adjustment in real time；
The computer computing platform includes ink droplet state parameter extraction unit, drive waveforms characterization parameter extraction unit and has
The adjustment unit of feedback mechanism, it is specific as follows：
The ink droplet state parameter extraction unit is carried using Threshold Segmentation Algorithm from the gray level image that the CCD camera obtains
The profile for taking out ink droplet, determines the physical distance corresponding to each pixel, based on the absolute axial symmetry of ink droplet it is assumed that calculating ink droplet
The quantity of size, trailing length and satellite ink droplet；
The drive waveforms characterization parameter extraction unit according to the quantity of the ink drop size, trailing length and satellite ink droplet and
Piezoelectric type printing head operation principle records the drive waveforms characterization parameter corresponding to the ink droplet；
The adjustment unit with feedback mechanism is according to the corresponding drive waveforms characterization parameter of current ink droplet and expectation ink
The gap of the drive waveforms characterization parameter of drop, is optimized using artificial bee colony algorithm, obtains the ink droplet driving wave of an optimization
The ink droplet drive waveforms characterization parameter of the optimization is passed to nozzle drive control device by shape characterization parameter；
The drive waveforms characterization parameter includes：
The time t of Maximum Forward Voltage is risen to by no-voltage when driver control module is receivedrP, Maximum Forward Voltage VP、
Maximum Forward Voltage duration tdP：, drop to by Maximum Forward Voltage the time t of no-voltagefP, no-voltage it is lasting when
Between tiWhen, the analog-digital chip AD5752 generates required positive polarity trapezoidal wave；
Drop to the time t of inverse peak voltage by no-voltage when driver control module is receivedrN, inverse peak voltage VN、
Inverse peak voltage duration tdN, rise to by inverse peak voltage the time t of no-voltagefN：When, the digital-to-analogue conversion
Chip AD5752 generates required negative polarity trapezoidal wave.
2. the ink droplet spray regime according to claim 1 for piezoelectric type printing head adjusts system, it is characterised in that：
The CCD camera is mounted on the front of piezoelectric type printing head position on the lower side, with piezoelectric type printing head
Horizontal distance is 0.5-0.6 meters, and the vertical range with piezoelectric type printing head is at 0.3-0.5 meters.
3. the ink droplet spray regime according to claim 2 for piezoelectric type printing head adjusts system, it is characterised in that：
The CCD camera uses high-speed industrial CCD camera, and minimum exposure time is in musec order or following；
The amplification factor of the front end object lens of the CCD camera is at 120 times or more.
4. the ink droplet spray regime according to claim 3 for piezoelectric type printing head adjusts system, it is characterised in that：
The nozzle drive control device includes shell, and driver CAN bus communication groove and piezoelectric type are equipped in the top of the shell
Printing head signal wire exports groove；
Driver control module is housed in the shell, which includes that microcontroller circuit, CAN bus are logical
Believe that circuit and power circuit occur for circuit, drive signal；
The microcontroller circuit includes STC12C5A microcontrollers and its peripheral circuit, and computer meter is received by CAN bus
Calculate the voltage and timing control of drive waveforms driving parameter and piezoelectric type printing head that platform is sent；
The CAN bus telecommunication circuit includes TJA1050 and its peripheral circuit, realizes the serial logical of the STC12C5A microcontrollers
Believe the physical transformation of interface and CAN bus communication interface；
It is equipped with CAN bus communication interface in the CAN bus telecommunication circuit, is calculated by the CAN bus and computer
Platform is connected, which is located at the communication groove of the driver CAN bus above nozzle drive control device shell
Place；
It includes bipolarity serial digital-analog conversion chip AD5752 and its peripheral circuit that circuit, which occurs, for the drive signal, generates and is suitble to
In the required voltage signal of piezoelectric type printing head；
Occur to be equipped with piezoelectric type printing head signal wire output interface on circuit in the drive signal, be printed by piezoelectric type
Spout signal line is connected with piezoelectric type printing head, which is located at nozzle drive control
Piezoelectric type printing head signal wire above device shell exports groove；
The power circuit includes LM2940 and its peripheral circuit, and system+24V DC power supplies are depressured to+5V, is microcontroller
Circuit and other+5V system power supplies occur for circuit, CAN bus telecommunication circuit, drive signal.
5. any ink droplet spray regime adjustment system for piezoelectric type printing head of Claims 1-4 4 is utilized to realize
The ink droplet spray regime method of adjustment for piezoelectric type printing head, it is characterised in that：The method includes：
(1), the drive waveforms characterization parameter t of ink droplet it is expected in settingrP,VP,tdP,tfP,ti,trN,VN,tdN,tfN；
(2), the ink droplet that piezoelectric type printing head ejects is captured by CCD camera；
(3), ink droplet state parameter is extracted, the ink droplet state parameter includes the number of ink drop size, trailing length and satellite ink droplet
Amount；
(4), the drive waveforms characterization parameter of current ink droplet is extracted；
(5), the drive waveforms characterization parameter of current ink droplet and the drive waveforms characterization parameter of desired ink droplet are compared one by one,
If the error of each drive waveforms characterization parameter is receiving in range, by the drive waveforms characterization parameter of current ink droplet
Drive waveforms characterization parameter as an optimization, into (7) step；If gap is not receiving in range, into (6) step；
(6), the drive waveforms characterization parameter of current ink droplet is optimized using artificial bee colony algorithm, show that the ink droplet of optimization drives
Dynamic waveform characterization parameter；
(7), the drive waveforms characterization parameter of optimization is output to nozzle drive control device；
(8), judge whether to need to it is expected that the drive waveforms characterization parameter of ink droplet is updated, if update, enter (9)
Step；It does not update, then returns to (2) step；
(9), using the drive waveforms characterization parameter of current ink droplet as the drive waveforms characterization parameter of desired ink droplet, it is then back to
(2) step.
6. the ink droplet spray regime method of adjustment according to claim 5 for piezoelectric type printing head, it is characterised in that：
In the step (4) during extracting drive waveforms characterization parameter, the evaluation function of setting is as follows,
Wherein, w (1) and w (2) is setting coefficient, and V is current ink drop size, and Vt is it is expected droplet volume, and Ns is satellite ink droplet number
Amount.
7. the ink droplet spray regime method of adjustment according to claim 6 for piezoelectric type printing head, it is characterised in that：
The drive waveforms characterization parameter needs to meet following conditions：
trP+tdP+tfP+ti+trN+tdN+tfN≤Ts-20us
ti≤2(trP+tdP+tfP)
VP≥VN
VP+VN≤28V
VP,VN≥5V
trP,tdP,tfP,ti,trN,tdN,tfN≥0.1us
trP,tfP,trN,tfN≤0.5us
Wherein, Ts is the work period of piezoelectric type printing head.
8. the ink droplet spray regime method of adjustment according to claim 7 for piezoelectric type printing head, it is characterised in that：
Within receiving ranging from positive and negative 5% in the step (5).
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| CN109927291B (en) * | 2017-12-15 | 2020-11-03 | 中国科学院沈阳自动化研究所 | 3D printing head driving device and method suitable for high-viscosity biological material |
| CN109703196B (en) * | 2018-03-13 | 2020-05-05 | 广东聚华印刷显示技术有限公司 | Method for detecting printing head ink drop condition correction result and ink drop titration analysis system |
| CN108528050A (en) * | 2018-04-14 | 2018-09-14 | 大丰鑫源达化工有限公司 | The system and method for fluency is printed using ink droplet observation instrument tested inks |
| CN113211983B (en) * | 2021-04-15 | 2022-07-26 | 华南理工大学 | Piezoelectric ink-jet system applied to printing ink drops and optimization method thereof |
| CN113211979B (en) * | 2021-04-21 | 2022-04-22 | 华南理工大学 | Ink piezoelectric control system capable of improving printing precision and optimization method |
| CN113547844B (en) * | 2021-07-21 | 2022-08-12 | 深圳圣德京粤科技有限公司 | Ink jet ink amount control method for starch food material and printing equipment |
| CN114603996B (en) * | 2022-02-11 | 2024-02-13 | 大连理工大学 | Method for determining driving voltage waveform of piezoelectric ink-jet printing head |
| CN117734314A (en) * | 2022-09-13 | 2024-03-22 | 杜文华 | Method for controlling ink drop shape and ink jet printer |
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| JP5384598B2 (en) * | 2011-09-09 | 2014-01-08 | シャープ株式会社 | Capacitive touch sensor panel, capacitive touch sensor system using the same, and information input / output device |
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