CN113910776B - OLED printer nozzle exhaust device and control method thereof - Google Patents
OLED printer nozzle exhaust device and control method thereof Download PDFInfo
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- CN113910776B CN113910776B CN202111516702.1A CN202111516702A CN113910776B CN 113910776 B CN113910776 B CN 113910776B CN 202111516702 A CN202111516702 A CN 202111516702A CN 113910776 B CN113910776 B CN 113910776B
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- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 abstract description 5
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Images
Classifications
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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
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16517—Cleaning of print head nozzles
- B41J2/1652—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head
- B41J2/16532—Cleaning of print head nozzles by driving a fluid through the nozzles to the outside thereof, e.g. by applying pressure to the inside or vacuum at the outside of the print head by applying vacuum only
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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
- B41J2/135—Nozzles
- B41J2/165—Prevention or detection of nozzle clogging, e.g. cleaning, capping or moistening for nozzles
- B41J2/16517—Cleaning of print head nozzles
- B41J2002/16573—Cleaning process logic, e.g. for determining type or order of cleaning processes
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- Ink Jet (AREA)
Abstract
The invention belongs to the technical field of printers, and discloses an OLED printer nozzle exhaust device and a control method thereof, wherein the OLED printer nozzle exhaust device comprises: the vacuum ink suction head is upwards arranged at the lower side of the ink gun of the OLED printer, and a gap is formed between the upper end of the vacuum ink suction head and the ink gun; the vacuum generating device is connected with the vacuum ink absorbing head through an ink absorbing pipeline and is used for providing vacuum negative pressure for the vacuum ink absorbing head; the ink drop observer comprises an observation light source and an observation camera which are respectively arranged at two sides of the gap, wherein the observation camera is used for shooting an image of the ink drop passing through the gap, and the observation light source is used for providing background light required by the operation of the observation camera; the controller is electrically connected with the vacuum generating device and the ink drop observation instrument; the computer is used for controlling the vacuum generation device and the ink drop observation instrument to work through the controller; the air in the ink gun can be discharged and the automatic blockage cleaning treatment of the ink gun can be realized.
Description
Technical Field
The invention relates to the technical field of printers, in particular to an OLED printer nozzle exhaust device and a control method thereof.
Background
An Organic Light-Emitting Diode (OLED) printer is a device for preparing an Organic Light-Emitting layer on an OLED substrate, mainly uses a high-precision nozzle to directly spray and print materials on the surface of the substrate to form an RGB Organic Light-Emitting layer, and belongs to an ink-jet printer.
In practical use, when the ink of the OLED printer is used up, the ink bottle needs to be replaced, and at the moment, the ink gun of the OLED printer easily enters air, so that the ink jetting effect at the initial starting stage can be influenced when the OLED printer is restarted, and a poor product is generated; in addition, the inkjet head of the OLED printer is sometimes blocked to eject ink effectively (for example, by undissolved solute particles in the ink), and when the situation occurs, the blockage is generally cleared manually, which is inconvenient to use.
Disclosure of Invention
In view of the defects of the prior art, the present application aims to provide an OLED printer nozzle exhaust device and a control method thereof, which can achieve air exhaust in an inkjet head and automatic blockage clearing treatment of the inkjet head.
In a first aspect, the present application provides an OLED printer nozzle exhaust apparatus, including:
the vacuum ink suction head is upwards arranged on the lower side of an ink gun of the OLED printer, a gap is reserved between the upper end of the vacuum ink suction head and the ink gun, and the vacuum ink suction head is used for sucking an ink jetting hole of the ink gun;
the vacuum generating device is connected with the vacuum ink absorbing head through an ink absorbing pipeline and is used for providing vacuum negative pressure for the vacuum ink absorbing head;
the ink droplet observation instrument comprises an observation light source and an observation camera which are respectively arranged at two sides of the gap, the observation camera is used for shooting an image of the ink droplet passing through the gap, and the observation light source is used for providing background light required by the operation of the observation camera;
the controller is electrically connected with the vacuum generating device and the ink drop observation instrument;
and the computer is electrically connected with the controller and is used for controlling the vacuum generation device and the ink drop observation instrument to work through the controller.
When the OLED printer nozzle exhaust device is used, the vacuum ink absorption head is aligned to an ink jetting hole of the ink jet head, then the vacuum generating device works to enable the vacuum ink absorption head to adsorb the ink jetting hole, so that air and blockage in the ink jetting hole can be sucked out, whether the air and the blockage are completely sucked out or not can be determined by detecting the ink jetting condition of the ink jetting hole through the ink droplet observation instrument, and adsorption is stopped when the air and the blockage are completely sucked out; the air in the ink gun can be discharged and the automatic blockage cleaning treatment of the ink gun can be realized.
Preferably, the vacuum generating device comprises a waste ink collecting bottle and a vacuum generator, the waste ink collecting bottle is provided with a suction port at the upper part, the suction port is communicated with the vacuum generator, the top part of the waste ink collecting bottle is provided with a conduit, the lower end of the conduit is inserted into the inner cavity of the waste ink collecting bottle and extends to the lower part of the suction port, and the upper end of the conduit is communicated with the ink absorbing pipeline.
The waste ink sucked out can be collected in a centralized way through the waste ink collecting bottle, and the waste ink is prevented from polluting the surrounding environment.
Preferably, the bottom of the inner cavity of the waste ink collecting bottle is provided with an adsorption sponge.
Preferably, an adsorption bag is arranged at the air suction port, and the adsorption bag is used for adsorbing ink drops in the air flowing into the air suction port.
The ink droplets can be effectively prevented from leaving the waste ink collecting bottle along with the air flow to pollute the environment.
Preferably, the adsorption bag comprises a cylindrical packaging shell, breathable packaging films arranged at two ends of the cylindrical packaging shell and adsorption particles filled in the cylindrical packaging shell, wherein one breathable packaging film is arranged close to the air suction port.
Preferably, the adsorption particles are microporous particles, and the adsorption particles comprise at least one of polylactic acid particles, polyurethane particles, silica gel particles and activated alumina particles.
Preferably, OLED printer shower nozzle exhaust apparatus, still include remove the seat and be used for adjusting remove the horizontal position's of seat biax drive arrangement, vacuum ink suction head with ink droplet visulizer all fixes the setting remove on the seat, biax drive arrangement with controller electric connection.
In a second aspect, the present application provides a method for controlling an OLED printer nozzle exhaust device, which is applied to the aforementioned computer of the OLED printer nozzle exhaust device;
the OLED printer nozzle exhaust device control method comprises the following steps:
A1. sending a starting instruction to the controller to enable the controller to control the vacuum generation device and the ink droplet observation instrument to be started;
A2. acquiring a first image at a gap between the vacuum ink suction head and an ink jet head of an OLED printer acquired by the ink droplet observer;
A3. when the first image is identified to contain ink drops, sending a first pause instruction to the controller to enable the controller to control the vacuum generation device to stop working;
A4. the following steps are cyclically executed until the ink ejection holes of the ink jet head are free from blockages:
acquiring a second image at a gap between the vacuum ink suction head and an ink jet head of an OLED printer acquired by the ink droplet observer;
judging whether the ink jetting holes of the ink jet head are blocked or not according to the distribution condition of the ink drops in the second image;
and when the blockage exists in the ink jetting hole, sending a first restarting instruction to the controller, so that the controller controls the vacuum generation device to restart and stop working after working for a preset time.
The control method can effectively realize the automation of the air exhaust and blockage removal processes.
Preferably, the step of judging whether the ink jetting holes of the ink jet head have the blockage according to the distribution of the ink drops in the second image comprises the following steps:
identifying a distribution width of ink droplets in the second image;
and when the distribution width is not within the standard distribution width range, judging that the ink jet hole is blocked.
Preferably, the step of judging whether the ink jetting holes of the ink jet head have the blockage according to the distribution of the ink drops in the second image comprises the following steps:
detecting whether there is a satellite ink droplet in the second image;
if yes, judging that the ink jet hole is blocked.
Has the advantages that:
when the OLED printer nozzle exhaust device and the control method thereof are used, the vacuum ink absorbing head is aligned to the ink jetting hole of the ink jetting head, then the vacuum generating device works to enable the vacuum ink absorbing head to absorb the ink jetting hole, so that air and blockage in the ink jetting hole can be sucked out, whether the air and the blockage are completely sucked out or not can be determined by detecting the ink jetting condition of the ink jetting hole through the ink droplet observer, and the adsorption is stopped when the air and the blockage are completely sucked out; the air in the ink gun can be discharged and the automatic blockage cleaning treatment of the ink gun can be realized.
Drawings
Fig. 1 is a schematic structural diagram of an OLED printer nozzle exhaust device according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a vacuum generating device of an OLED printer nozzle exhaust device according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an adsorption bag of an OLED printer nozzle exhaust device according to an embodiment of the present invention.
Fig. 4 is a top view of a vacuum generating device of an OLED printer nozzle exhaust device according to an embodiment of the present invention.
Fig. 5 is a flowchart of a method for controlling an OLED printer nozzle exhaust device according to an embodiment of the present invention.
Description of reference numerals: 1. a vacuum ink suction head; 2. a vacuum generating device; 201. a waste ink collection bottle; 202. a vacuum generator; 203. a conduit; 204. adsorbing the sponge; 205. adsorbing the bag; 206. a cylindrical packaging shell; 207. a breathable packaging film; 208. adsorbing the particles; 209. a planar wall surface; 210. a cover body; 3. an ink suction pipeline; 4. observing a light source; 5. observing the camera; 6. a controller; 7. a computer; 90. an ink jet head; 91. a nozzle controller; 92. an ink path controller.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The following disclosure provides embodiments or examples for implementing different configurations of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Referring to fig. 1, an OLED printer nozzle exhaust apparatus provided in the present application includes:
the vacuum ink suction head 1 is arranged on the lower side of an ink gun 90 of the OLED printer in a mode that the vacuum ink suction head 1 faces upwards, a gap is reserved between the upper end of the vacuum ink suction head 1 and the ink gun 90, and the vacuum ink suction head 1 is used for adsorbing ink jetting holes of the ink gun 90;
the vacuum generating device 2 is connected with the vacuum ink suction head 1 through an ink suction pipeline 3 and is used for providing vacuum negative pressure for the vacuum ink suction head 1;
the ink drop observer comprises an observation light source 4 and an observation camera 5 which are respectively arranged at two sides of the gap, the observation camera 5 is used for shooting images of the ink drops passing through the gap, and the observation light source 4 is used for providing background light required by the operation of the observation camera 5;
the controller 6, the controller 6 is electrically connected with the vacuum generating device 2 and the ink drop observer;
and the computer 7 is electrically connected with the controller 6, and is used for controlling the vacuum generation device 2 and the ink drop observation instrument to work through the controller 6.
When the OLED printer nozzle exhaust device is used, the vacuum ink suction head 1 is aligned to an ink jetting hole of the ink jet head 90, then the vacuum generating device 2 works to enable the vacuum ink suction head 1 to adsorb the ink jetting hole, so that air and blockage in the ink jetting hole can be sucked out, whether the air and the blockage are completely sucked out can be determined by detecting the ink jetting condition of the ink jetting hole through an ink droplet observer, and adsorption is stopped when the air and the blockage are completely sucked out; the air discharge in the ink jet head 90 and the automatic blockage removal process of the ink jet head 90 can be realized.
The size of the gap between the upper end of the vacuum ink suction head 1 and the ink jet head 90 can be set according to actual needs, and is related to the actual generated negative pressure of the vacuum generating device 2 and the actual viscosity of the ink, the larger the negative pressure actually generated by the vacuum generating device 2 is, the larger the gap can be set, and the larger the actual viscosity of the ink is, the smaller the gap should be set.
The observation light source 4 is mainly used to provide a monochromatic uniform background light (the color of which can be set according to actual needs, but needs to be different from the color of ink) so that the computer 7 can identify ink droplets in the image captured by the observation camera 5. The shooting frame rate of the observation camera 5 can be set according to actual needs, and the higher the shooting frame rate is, the better the clear ink drop image can be shot.
In some preferred embodiments, referring to fig. 2, the vacuum generating device 2 includes a waste ink collecting bottle 201 and a vacuum generator 202, the waste ink collecting bottle 201 is provided with a suction port at an upper portion thereof, the suction port is communicated with the vacuum generator 202, the waste ink collecting bottle 201 is provided with a conduit 203 at a top portion thereof, a lower end of the conduit 203 is inserted into an inner cavity of the waste ink collecting bottle 201 and extends below the suction port, and an upper end of the conduit 203 is communicated with the ink absorbing pipe 3. The waste ink sucked out can be collected collectively by the waste ink collecting bottle 201, and the waste ink is prevented from contaminating the surrounding environment. Because the height of the lower end of the duct 203 is lower than that of the air suction port, the air flow entering the waste ink collecting bottle 201 from the duct 203 flows downwards and then turns upwards until entering the air suction port, so that ink droplets in the air flow can be separated from the air flow under the action of inertia, and the air flow is prevented from directly carrying a large number of ink droplets to enter the air suction port.
Preferably, referring to fig. 2, the bottom of the inner cavity of waste ink bottle 201 is provided with an adsorption sponge 204. The ink droplets in the fixed air stream are adsorbed by the adsorption sponge 204, thereby further reducing the ink droplet content in the air stream flowing into the suction port.
In some preferred embodiments, referring to fig. 2, an adsorption bag 205 is provided at the suction port, and the adsorption bag 205 is used for adsorbing ink droplets in the air flow flowing into the suction port. In practical applications, the ink used for printing the RGB organic light-emitting layers contains a large amount of harmful substances, and direct discharge may cause serious environmental pollution, and here, the ink droplets can be effectively prevented from leaving the waste ink bottle 201 with the air flow to pollute the environment by the adsorption of the adsorption bag 205.
In this embodiment, referring to fig. 3, the adsorption pack 205 includes a cylindrical packaging case 206, air-permeable packaging films 207 disposed at both ends of the cylindrical packaging case 206, and adsorption particles 208 filled in the cylindrical packaging case 206, wherein one of the air-permeable packaging films 207 is disposed in close contact with the air suction port. During operation, the air flow passes through one air-permeable packaging film 207, the adsorption particles 208 and the other air-permeable packaging film 207 in sequence and then enters the air suction port, and the ink droplets in the air flow can be sufficiently removed through the filtering action of the two air-permeable packaging films 207 and the adsorption action of the adsorption particles 208.
Wherein, this absorption package 205 is preferably through setting up in waste ink collecting bottle 201 by the removable mode to absorption package 205 can directly be changed after using a period of time, in order to guarantee the filter effect. In fig. 3, the cylindrical package case 206 is cylindrical, but is not limited to cylindrical, and may be square or other shapes, for example.
Preferably, the breathable packaging film 207 may be, but is not limited to, a microporous polyurethane film, a microporous silicone film, a microporous resin film, or the like.
Preferably, the adsorbent particles 208 are microporous particles; for example, the adsorbent particles 208 may include, but are not limited to, at least one of polylactic acid particles, polyurethane particles, silica gel particles, activated alumina particles. The material of the adsorbent particles 208 may be selected according to the specific composition of the ink.
In some embodiments, the vacuum generator 202 is directly fixed to the sidewall of the waste ink bottle 201, as shown in fig. 4, the sidewall of the waste ink bottle 201 includes a flat wall 209, and the vacuum generator 202 is fixedly connected to the flat wall 209, so that the vacuum generator 2 has a high compactness.
In some embodiments, the upper end of the waste ink bottle 201 is provided with a removable cap 210 (e.g., the cap 210 is provided with internal threads, the upper end of the waste ink bottle 201 is provided with corresponding external threads, and the cap 210 is connected to the upper end of the waste ink bottle 201 via the internal threads), and the conduit 203 is connected to the cap 210. Thus, the cleaning of the waste ink in the waste ink collecting bottle 201 and the cleaning of the waste ink collecting bottle 201 are facilitated.
In practical application, the ink-jet head 90 will be provided with a plurality of ink-jetting holes, and the position of the vacuum ink-absorbing head 1 can be fixed or movable; for the condition that the position of the vacuum ink suction head 1 is fixed, the position of the ink jet head 90 can be adjusted by the OLED printer to enable the ink jet hole needing to be exhausted or cleaned to be aligned with the vacuum ink suction head 1; in the case that the position of the vacuum ink suction head 1 is movable, so that the vacuum ink suction head 1 is aligned with an ink jetting hole to be exhausted or cleared by adjusting the position of the vacuum ink suction head 1, wherein the vacuum ink suction head 1 can be adjusted manually or automatically.
In some embodiments, the OLED printer head exhaust device further includes a movable base and a biaxial driving device for adjusting the horizontal position of the movable base, the vacuum ink suction head 1 and the ink droplet observation instrument are both fixedly disposed on the movable base, and the biaxial driving device is electrically connected to the controller 6. Therefore, the relative positions of the vacuum ink suction head 1, the observation light source 4 and the observation camera 5 are fixed, image information shot by the observation camera 5 can be directly compared to determine the blocking condition of an ink jetting hole, and when image analysis is carried out, the image is not required to be subjected to standardized processing (such as zooming, rotating, translating, cutting and the like) according to the relative position change of the vacuum ink suction head 1, the observation light source 4 and the observation camera 5, so that the processing efficiency is improved. Further, the vacuum ink suction head 1 can be fixed on the movable seat through detachable connection modes such as buckle connection, magnetic connection and the like, so that the vacuum ink suction head 1 can be taken out of the movable seat, the vacuum ink suction head 1 is held by a user to exhaust or clear the ink jetting hole of the ink jet head 90, the user can select the vacuum ink suction head 1 to be held by the user or fix the vacuum ink suction head 1 on the movable seat to exhaust or clear the ink jetting hole as required, and the flexibility is higher.
In some preferred embodiments, referring to fig. 1, the controller 6 is further electrically connected to a head controller 91 of the inkjet head 90 (the head controller 91 is used for controlling the movement of the inkjet head 90) to obtain the position information of the inkjet head 90 sent by the head controller 91, so that the dual-axis driving device can be controlled to adjust the position of the movable seat according to the position information of the inkjet head 90, and the vacuum inkjet head 1 can be automatically aligned with the inkjet hole requiring air exhaust or blockage removal.
In some preferred embodiments, referring to fig. 1, the controller 6 is further electrically connected to an ink path controller 92 of the OLED printer (the ink path controller 92 is used for controlling the ink ejection process of the inkjet head 90) to obtain the ink ejection timing information of the inkjet head 90, so that the observation light source 4 and the observation camera 5 can be controlled to operate only when the inkjet head 90 ejects ink according to the ink ejection timing information. In fact, the observation light source 4 may be kept normally bright, but generates heat more and has a shorter service life, and the observation light source may be lighted when the inkjet head 90 performs inkjet, thereby avoiding this problem.
Referring to fig. 5, the present application provides a method for controlling an OLED printer nozzle exhaust device, which is applied to the computer 7 of the OLED printer nozzle exhaust device;
the OLED printer nozzle exhaust device control method comprises the following steps:
A1. sending a starting instruction to the controller 6, so that the controller 6 controls the vacuum generation device 2 and the ink drop observation instrument to start;
A2. acquiring a first image at a gap between the vacuum ink-absorbing head 1 and an ink-jet head 90 of the OLED printer, acquired by an ink droplet viewer;
A3. when recognizing that the first image contains ink drops, sending a first pause instruction to the controller 6 to enable the controller 6 to control the vacuum generating device 2 to stop working;
A4. the following steps are cyclically executed until the ink ejection holes of the ink-jet head 90 are free from clogging:
A401. acquiring a second image at the gap between the vacuum ink-absorbing head 1 and the ink-jet head 90 of the OLED printer, acquired by an ink drop viewer;
A402. judging whether the ink jetting holes of the ink jet head 90 have the blockage according to the distribution of the ink drops in the second image;
A403. when the ink jet hole is blocked, a first restart instruction is sent to the controller 6, so that the controller 6 controls the vacuum generating device 2 to restart and stop working after working for a preset time.
If there is air to be removed in the ink-jet holes of the ink-jet head 90, after the vacuum generation device 2 is started, the air is sucked out first, at this time, there is no ink droplet image in the first image collected by the ink droplet observer until the ink droplet image appears in the first image, which indicates that the air is completely discharged, at this time, the vacuum generation device 2 is suspended first, the OLED printer performs ink-jet under its own ink-jet power, if there is a blockage in the ink-jet holes, a phenomenon of abnormal ink droplet distribution (such as too small or too large ink droplet distribution width, satellite ink droplet generation, abnormal size and shape of ink droplet, etc.) may be caused, if there is a blockage according to the ink droplet distribution condition, the vacuum generation device 2 is started again to perform suction and then perform judgment again, and so on until the blockage is completely removed. Therefore, the control method can effectively realize the automation of the air exhaust and blockage removal processes.
Wherein, whether the first image includes ink drops or not can be determined by the pixel values of the pixels in the first image, for example, in some embodiments, step a3 includes:
acquiring a pixel value of each pixel point of a first image;
judging whether the pixel values of the pixel points exceeding a preset number threshold value in the continuous N frames of first images are in a standard pixel value range; wherein, N is a preset positive integer value (which can be set according to actual needs, for example, 5 to 10);
if yes, determining that the first image contains ink drops;
if not, the first image is judged not to contain ink drops.
Wherein the standard pixel value range is preset according to a specific ink color. In fact, if the first image does not contain ink droplets, the pixel values of all the pixel points are the pixel values corresponding to the color of the background light, and when the ink droplets pass through the gap, the pixel values of part of the pixel points are changed, so that whether the first image contains the ink droplets or not can be reliably judged.
In some embodiments, step a402 comprises:
identifying a distribution width of ink droplets in the second image;
when the distribution width is not within the standard distribution width range, it is judged that the ink jetting hole has a clogging.
Wherein, the standard distribution width range can be measured in advance through experiments.
Wherein the step of identifying the distribution width of the ink droplets in the second image comprises:
acquiring pixel coordinates of each ink pixel point; the ink pixel point is a pixel point with a pixel value within a standard pixel value range; the pixel coordinates include an abscissa and an ordinate;
sequencing the ink pixel points in an ascending order according to the size of the abscissa;
calculating the horizontal coordinate mean value of the m sorted last ink pixel points to obtain a first mean value; m is a preset positive integer;
calculating the mean value of the horizontal coordinates of the first m sequenced ink pixel points to obtain a second mean value;
the difference between the first average value and the second average value is calculated as the distribution width of the ink droplets.
The distribution width of the ink droplets herein refers to the width of the ink jet ribbon (the range of the ink droplet concentrated distribution area), the specific value of m can be set according to the actual requirement, and by setting the appropriate value of m, the influence of the presence of individual satellite ink droplets (i.e. discrete ink droplets having a larger distance from the ink jet ribbon) on the accuracy of the calculation result of the distribution width of the ink droplets can be reduced.
In some embodiments, step a402 comprises:
detecting whether the second image has satellite ink drops;
if yes, the ink jet hole is judged to have a blockage.
In some examples, the step of detecting whether there are satellite ink droplets in the second image comprises:
acquiring pixel coordinates of each ink pixel point; the ink pixel point is a pixel point with a pixel value within a standard pixel value range; the pixel coordinates include an abscissa and an ordinate;
sequencing the ink pixel points in an ascending order according to the size of the abscissa;
calculating the horizontal coordinate mean value of the m sorted last ink pixel points to obtain a first mean value; m is a preset positive integer;
calculating the mean value of the horizontal coordinates of the first m sequenced ink pixel points to obtain a second mean value;
acquiring the sum of the points of the first type of ink pixel points and the points of the second type of ink pixel points; the first type of ink pixel points refer to ink pixel points of which the abscissa is larger than a first mean value and the difference between the abscissa and the first mean value is larger than a preset deviation threshold value; the second type of ink pixels are ink pixels with the abscissa smaller than a second mean value and the difference between the second mean value and the abscissa larger than a preset deviation threshold value;
if the sum exceeds a preset total threshold value, judging that the second image has satellite droplets; otherwise, judging that no satellite drop exists in the second image.
Actually, the ink pixel points of each ink droplet can be clustered through a clustering algorithm to obtain the pixel coordinates of the ink pixel points of each ink droplet, then the center coordinates of each ink droplet are calculated according to the pixel coordinates of the ink pixel points of each ink droplet, then the minimum distance value between the center of each ink droplet and other ink droplets (namely the minimum value in the distances between the center of each ink droplet and the centers of other ink droplets) is obtained according to the center coordinates of each ink droplet, if the minimum distance value of each ink droplet exceeds M (a preset positive integer, which can be set according to actual needs) and is greater than a preset distance threshold value, it is determined that a satellite droplet exists in the second image, and if the minimum distance value of each ink droplet exceeds M (a preset positive integer, which can be set according to actual needs) is greater than the preset distance threshold value, it is determined that no satellite droplet exists in the second image. Compared with the previous mode, the mode has larger data processing amount and lower processing efficiency.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, which are substantially the same as the present invention.
Claims (10)
1. An OLED printer nozzle exhaust apparatus, comprising:
the vacuum ink suction head (1) is upwards arranged on the lower side of an ink gun (90) of the OLED printer, a gap is reserved between the upper end of the vacuum ink suction head (1) and the ink gun (90), and the vacuum ink suction head (1) is used for sucking an ink jetting hole of the ink gun (90);
the vacuum generating device (2) is connected with the vacuum ink suction head (1) through an ink suction pipeline (3) and is used for providing vacuum negative pressure for the vacuum ink suction head (1);
the ink droplet observer comprises an observation light source (4) and an observation camera (5) which are respectively arranged at two sides of the gap, the observation camera (5) is used for shooting images of the ink droplets passing through the gap, and the observation light source (4) is used for providing background light required by the operation of the observation camera (5);
a controller (6), wherein the controller (6) is electrically connected with the vacuum generating device (2) and the ink drop observation instrument;
and the computer (7), the computer (7) is electrically connected with the controller (6) and is used for controlling the vacuum generation device (2) and the ink drop observation instrument to work through the controller (6).
2. The OLED printer head exhaust apparatus according to claim 1, wherein the vacuum generating device (2) comprises a waste ink collecting bottle (201) and a vacuum generator (202), the waste ink collecting bottle (201) is provided with a suction port at its upper part, the suction port is communicated with the vacuum generator (202), the waste ink collecting bottle (201) is provided with a conduit (203) at its top part, the lower end of the conduit (203) is inserted into the inner cavity of the waste ink collecting bottle (201) and extends below the suction port, and the upper end of the conduit (203) is communicated with the ink absorbing pipe (3).
3. The OLED printer head vent apparatus of claim 2, wherein the bottom of the waste ink collecting bottle (201) cavity is provided with an adsorption sponge (204).
4. The OLED printer head exhaust apparatus according to claim 2, wherein the suction port is provided with a suction bag (205), and the suction bag (205) is used for sucking ink droplets in the gas flowing into the suction port.
5. The OLED printer nozzle exhaust device according to claim 4, wherein the adsorption bag (205) comprises a cylindrical packaging shell (206), air-permeable packaging films (207) arranged at two ends of the cylindrical packaging shell (206), and adsorption particles (208) filled in the cylindrical packaging shell (206), wherein one of the air-permeable packaging films (207) is arranged close to the air suction port.
6. The OLED printer head vent apparatus of claim 5, wherein the adsorbent particles (208) are microporous particles, the adsorbent particles (208) comprising at least one of polylactic acid particles, polyurethane particles, silica gel particles, activated alumina particles.
7. The OLED printer nozzle exhaust device according to claim 1, further comprising a movable seat and a biaxial driving device for adjusting the horizontal position of the movable seat, wherein the vacuum ink suction head (1) and the ink droplet observation instrument are both fixedly arranged on the movable seat, and the biaxial driving device is electrically connected with the controller (6).
8. A method for controlling an OLED printer nozzle exhaust device, characterized by being applied to a computer (7) of the OLED printer nozzle exhaust device according to any one of claims 1 to 7;
the OLED printer nozzle exhaust device control method comprises the following steps:
A1. sending a starting instruction to the controller (6) to enable the controller (6) to control the vacuum generating device (2) and the ink drop observation instrument to be started;
A2. acquiring a first image at a gap between the vacuum ink suction head (1) and an ink jet head (90) of an OLED printer, acquired by the ink droplet viewer;
A3. when the first image is identified to contain ink drops, sending a first pause instruction to the controller (6) to enable the controller (6) to control the vacuum generating device (2) to stop working;
A4. cyclically executing the following steps until the ink ejection holes of the ink jet head (90) are free of blockages:
acquiring a second image at a gap between the vacuum ink suction head (1) and an ink jet head (90) of the OLED printer acquired by the ink droplet viewer;
judging whether the ink jetting holes of the ink jet head (90) are blocked or not according to the distribution of the ink drops in the second image;
and when the blockage exists in the ink jetting hole, sending a first restarting instruction to the controller (6), so that the controller (6) controls the vacuum generating device (2) to restart and stop working after working for preset time.
9. The OLED printer head vent apparatus control method according to claim 8, wherein the step of determining whether the inkjet holes of the inkjet head (90) have blockages according to the distribution of the ink droplets in the second image comprises:
identifying a distribution width of ink droplets in the second image;
and when the distribution width is not within the standard distribution width range, judging that the ink jet hole is blocked.
10. The OLED printer head vent apparatus control method according to claim 8, wherein the step of determining whether the inkjet holes of the inkjet head (90) have blockages according to the distribution of the ink droplets in the second image comprises:
detecting whether there is a satellite ink droplet in the second image;
if yes, judging that the ink jet hole is blocked.
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