CN114571882A - Method and system for online detection of spray hole state of spray head - Google Patents
Method and system for online detection of spray hole state of spray head Download PDFInfo
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- CN114571882A CN114571882A CN202210295196.6A CN202210295196A CN114571882A CN 114571882 A CN114571882 A CN 114571882A CN 202210295196 A CN202210295196 A CN 202210295196A CN 114571882 A CN114571882 A CN 114571882A
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- 239000007921 spray Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 30
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- 238000012360 testing method Methods 0.000 claims abstract description 55
- 238000007641 inkjet printing Methods 0.000 claims abstract description 8
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- 230000000903 blocking effect Effects 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 description 6
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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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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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
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/46—Applications of alarms, e.g. responsive to approach of end of line
Abstract
The invention discloses a method for detecting the spray hole state of a spray head on line, which relates to the technical field of ink-jet printing and comprises the following steps: when the spray head works, the spray head prints a test chart at the head fixing position of the working paper at normal production speed; acquiring the test chart through image acquisition equipment; processing the acquired test chart through an image acquisition processing system to obtain ink jet state data of the nozzle orifice of the spray head; judging whether the spray hole of the spray head has a fault or not according to the ink jet state data; the problems that the labor intensity of an existing manual detection mode is high, the labor cost is high, the online visual detection is high in cost, large in calculated amount and limited by regular products are solved through the scheme.
Description
Technical Field
The invention relates to the technical field of ink-jet printing, in particular to a method and a system for online detecting the spray hole state of a spray head.
Background
Ink jet printing technology refers to the technology of forming a graphic image that can be recognized by the naked eye by controlling a nozzle to eject ink droplets onto a printing medium, and generally, an ink jet nozzle is composed of a plurality of tiny nozzles, which can be arranged in a horizontal row, multiple horizontal rows, or a diagonal row, or multiple diagonal rows, and some other arrangement. By controlling the timing of firing the ink at these orifices, the desired printed image can be formed. The size of the jet orifice is generally very small, and the jet orifice is from dozens of micrometers to dozens of micrometers, and because the diameter of the jet orifice is small and the number of the jet orifices is large, and ink for ink jet and the using environment are integrated, the phenomena of jet orifice blockage (broken nozzle) or oblique jet (the drop point of ink drops is not vertical to the surface of the jet orifice, but exceeds the allowable angle error) are easy to occur, and the printed image generates defects and deviation. Such deviations can have unpredictable effects in industrial production applications, and can even have a significant impact on production efficiency, with significant direct and indirect losses.
At present, in order to avoid and reduce the influence and loss caused by the blockage and inclined spraying of the spray holes, high-frequency manual sampling inspection or online automatic inspection (such as visual inspection) is generally adopted to identify the defects of the inkjet printing products, and prompt or combine waste removal treatment of the products in time.
Manual spot inspection has the defects that the labor intensity is high, and the spot inspection with higher frequency is needed to reduce defective products; if the productivity is large, manual spot inspection may not be available at all; the problems of easy influence of the technique, experience and mind state of the sampling personnel and high labor cost;
the online vision detection is that the final image formed by ink-jet printing can cover some defects of the jet orifice, a perfect sample library needs to be established, and the system detects according to the sample library to distinguish the defects; the visual detection is suitable for detecting regular products, and is difficult to realize if the products are irregular; the requirement on the algorithm is high by depending on the visual algorithm; the system has a large amount of calculation and needs strong calculation capability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method and a system for online detecting the spray hole state of a spray head, and the problems that the existing online visual detection is high in cost, large in calculation amount and limited by regular products are solved through the method and the system.
The purpose of the invention is realized by the following technical scheme:
a method for online detecting a nozzle hole state of a nozzle, the method comprising:
when the spray head works, the spray head prints a test chart at a normal production speed at a fixed position of the head of the working paper;
acquiring the test chart through image acquisition equipment;
processing the acquired test chart through an image acquisition processing system to obtain ink jet state data of the nozzle orifice of the spray head;
and judging whether the spray hole of the spray head has a fault or not according to the ink jet state data.
Further, the processing the acquired test chart by the image acquisition and processing system comprises: the image acquisition processing system receives the test chart sent by the image acquisition equipment, compares the test chart with a preset spray detection chart, and calculates ink-jet state data according to pixels of the image acquisition equipment.
Further, the ink jet state data comprises a position number of the blocked jet orifice, the size of the ink drop of each jet orifice and the value of the oblique ejection of the ink drop of the jet orifice.
Further, the determining whether a failure exists in a nozzle hole of the nozzle by the inkjet status data includes: when the position number blocking the jet orifice is generated, the image acquisition processing system judges that the jet orifice has a fault, compares the ink droplet size of each jet orifice with a preset ink droplet size threshold value, when the ink droplet size is lower than the ink droplet size threshold value, namely the ink droplet is too small, the image acquisition processing system judges that the jet orifice has the fault, compares the value of the inclined jet of the ink droplet of the jet orifice with a preset inclined jet maximum threshold value, and when the value of the inclined jet of the ink droplet of the jet orifice exceeds the preset inclined jet maximum threshold value, the image acquisition processing system judges that the jet orifice has the fault.
Further, when the image acquisition processing system judges that the spray hole has a fault, the image acquisition processing system sends the serial number of the failed spray hole of the spray head and the fault reason to an alarm processing unit and an upper computer of the spray head, the alarm processing unit stores data sent by the image acquisition processing system, and meanwhile, an alarm device is started to perform early warning.
Further, when the upper computer of the nozzle receives the data sent by the image acquisition and processing system, the upper computer of the nozzle analyzes the data to obtain the number of the failed nozzle hole, and the upper computer of the nozzle increases the ink jetting amount of the adjacent nozzle hole of the failed nozzle hole.
Further, when the upper computer of the nozzle receives the data sent by the image acquisition processing system, the upper computer of the nozzle can control the standby nozzle to perform ink jet operation on the operation paper besides changing the ink jet amount of the adjacent nozzle of the failed nozzle.
The system comprises image acquisition equipment, an image acquisition and processing system, an upper computer of a sprayer, an alarm processing unit and an alarm device, wherein the image acquisition equipment is connected with the image acquisition and processing system, the image acquisition and processing system is respectively connected with the upper computer of the sprayer and the alarm processing unit, and the alarm processing unit is connected with the alarm device.
Furthermore, the image acquisition equipment is arranged behind the ink jet nozzle, one or more cameras are adopted, and the pixels of the cameras are determined by the size of the test chart to be acquired.
The invention has the beneficial effects that:
this application is through before the shower nozzle is printed in operation paper inkjet, print the test chart earlier, handle the test chart through gathering the test chart, judge whether orifice itself has trouble and failure reason, because this application is print the test paper in advance, so can be when being out of order, handle in advance, the current mode of judging orifice trouble through detecting the paper after the paper is printed has been avoided, can practice thrift the operation paper, can also handle the trouble through reserving the scheme in advance, and the calculated amount is little, do not rely on visual algorithm, and because print the test chart before the operation, the pattern of printing with follow-up operation is irrelevant, be not limited to the shape of operation pattern.
Drawings
FIG. 1 is a flow chart illustrating a method for online detection of showerhead orifice conditions in accordance with an exemplary embodiment;
FIG. 2 is a system diagram illustrating a system for online detection of showerhead orifice conditions in accordance with an exemplary embodiment;
FIG. 3 is a schematic view of a nozzle orifice of a showerhead shown in accordance with an exemplary embodiment;
FIG. 4 is a schematic diagram of a test chart shown in accordance with an exemplary embodiment;
in the figure: the method comprises the following steps of 1-image acquisition equipment, 2-image acquisition processing system, 3-upper computer of a spray head, 4-alarm processing unit and 5-alarm device.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other implementations made by those of ordinary skill in the art based on the embodiments of the present invention are obtained without inventive efforts.
In the description of the present invention, it is to be understood that the terms "counterclockwise", "clockwise", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used for convenience of description only, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting.
As shown in fig. 1, a method for online detecting the status of a nozzle hole of a nozzle, the method comprising:
s1, when the spray head works, the spray head prints a test chart at the head fixing position of the working paper sheet at normal production speed;
s2, acquiring the test chart through image acquisition equipment;
s3, processing the acquired test chart through an image acquisition processing system to obtain ink jet state data of the nozzle orifice of the spray head;
s4, judging whether the nozzle hole of the nozzle has a fault or not according to the ink jet state data;
specifically, when the sprayer works, a test chart is printed at normal production speed in an area which does not affect the printing of a product at the head of a piece of operation paper, the test chart is collected by an image collecting device and sent to an image collecting and processing system, the image collecting and processing system processes the test chart according to a preset spray detection chart to obtain ink-jet state data, and whether the spray holes of the sprayer have faults or not is judged according to the ink-jet state data, according to the scheme adopted by the application, the test paper is printed in advance, so that the test paper can be processed in advance when the faults occur, the existing mode that the faults of the spray holes are judged by detecting the paper after the paper is printed is avoided, the operation paper is saved, the faults can be processed in advance through a reserved scheme, the calculated amount is small, the visual algorithm is not depended on, and the test chart is printed before the operation and is unrelated to the patterns printed by the subsequent operation, and is not limited to the shape of the subsequent operation pattern.
Further, the processing the acquired test chart by the image acquisition and processing system comprises: the image acquisition processing system receives the test chart sent by the image acquisition equipment, compares the test chart with a preset spray detection chart, and calculates ink-jet state data according to pixels of the image acquisition equipment;
specifically, as shown in fig. 3, the nozzle is composed of nozzle rows A, B, C, D, the number and the interval of each row of nozzles are consistent, the coordinate positions in the X direction are different, according to the nozzle arrangement of the nozzle, a nozzle test chart is designed, as shown in fig. 4, the test chart is composed of a plurality of short lines (or dots), the length direction of the short lines is the paper feeding direction, each line is printed by one nozzle, and the printing system controls the nozzle to print the test chart. Taking the above nozzle orifice layout chart and test chart as examples, the first row of the test chart is printed by the orifice row A, and so on; each line in the test chart is printed by a corresponding jet orifice, and the state of each jet orifice can be evaluated by identifying and evaluating the lines; the long lines in the test chart are favorable for positioning the serial numbers of the spray holes, the spray holes are conveniently positioned when no spray holes are blocked, even if partial long lines are lost, because three long lines exist, the serial numbers of the spray holes corresponding to the long lines and the short lines in the test chart can be calculated according to the arrangement data of the spray holes of the spray head and the positions of the long lines, and in order to be more feasible, a plurality of sections of long lines can be designed, the collected test chart is analyzed through an image collection processing system, and the serial numbers of the spray holes corresponding to the long lines and the short lines in the test chart are calculated through the image of the pixel position; evaluating the sizes of the ink drops of all the jet holes by measuring and calculating the line widths of the long lines and the short lines in the test chart; evaluating the blocking and inclined spraying conditions of the spray holes by measuring and calculating the adjacent distance between the long line and the short line, for example, if the minimum value of the distance between the two adjacent lines is 2n times (n is equal to a positive integer) of the distance between the spray holes prefabricated by the spray head, blocking the spray holes by n spray holes in the middle, and calculating the serial numbers of the blocked spray holes by the long line for positioning; if the minimum value of the distance between two adjacent lines is smaller than 1 time of the distance between the prefabricated spray orifices of the spray head, judging oblique spraying, and adopting a trigonometric function to evaluate the oblique spraying condition according to the maximum value and the minimum value of the distance between the adjacent lines and the line length; if a plurality of spray heads exist, the test patterns and the spray hole layout data can be input into a system, so that the transfer is convenient;
specifically, the ejection detection pattern is a pattern which is ejected at the same ink ejection frequency of the test pattern under the condition that all the preset ejection holes of the nozzle are normal, that is, no ejection hole is blocked, the size of the ink droplet is smaller than a preset ink droplet size threshold, and the numerical value of the oblique ejection of the ink droplet is smaller than a preset threshold, and meanwhile, the image acquisition and processing system numbers all the ejection holes of the nozzle according to a certain sequence and records the number of each nozzle.
Further, the ink-jet state data comprises a position number for blocking the jet holes, the size of an ink droplet of each jet hole and a numerical value for obliquely jetting the ink droplet from the jet hole;
specifically, comparing the test chart with the ejection chart, it can be found out at which position in the test chart there is no ink drop, i.e. the nozzle corresponding to the ink drop is blocked, and according to the pixels of the image acquisition device, the size of a single ink drop can be calculated, and the value of the oblique ejection of the ink drop in the test chart compared with the ink drop in the ejection chart can be calculated.
Further, the determining whether a failure exists in a nozzle hole of the nozzle by the inkjet status data includes: when a position number blocking an orifice is generated, the image acquisition and processing system judges that the orifice has a fault, compares the size of an ink droplet of each orifice with a preset ink droplet size threshold, when the size of the ink droplet is lower than the ink droplet size threshold, namely the ink droplet is too small, the image acquisition and processing system judges that the orifice has the fault, compares the value of the inclined jet of the ink droplet of the orifice with a preset maximum inclined jet threshold, and when the value of the inclined jet of the ink droplet of the orifice exceeds the preset maximum inclined jet threshold, the image acquisition and processing system judges that the orifice has the fault;
specifically, after comparing the test chart with the ejection chart, the image acquisition processing system records which ejection holes are blocked and the numbers of the blocked ejection holes, compares the size of the ink drops with a preset ink drop size threshold value, when the size of the ink drops is smaller than the preset threshold value, the ink drops are small, in this case, the operation pattern may be left blank, if the size of the ink drops is too large, the influence on the operation pattern is not large, the operation pattern is not processed generally, and the number of the ejection holes with the small size of the ejected ink drops is recorded, and similarly, if the value of the inclined ejection of the ejection holes is too large, the original ink drops are too few or not, the operation pattern is left blank, and when the value of the inclined ejection of the ink drops is larger than the preset threshold value, the image acquisition processing system records the number of the ejection holes.
Further, when the image acquisition processing system judges that the spray hole has a fault, the image acquisition processing system sends the serial number of the spray hole of the failed spray head and the fault reason to an alarm processing unit and an upper computer of the spray head, the alarm processing unit stores data sent by the image acquisition processing system, and meanwhile, an alarm device is started to perform early warning;
specifically, when any fault condition occurs, the image acquisition and processing system sends the serial number and the fault reason of the fault spray hole to the alarm processing unit and the upper computer of the spray head respectively, the alarm processing unit receives and stores the data and sends a control instruction to the alarm device, the alarm device is started to early warn a worker, and the worker can know which spray hole is in fault and what reason is in alarm by looking over the data in the alarm processing unit and process the spray hole in time.
Further, when the upper computer of the nozzle receives the data sent by the image acquisition and processing system, the upper computer of the nozzle analyzes the data to obtain the number of the failed nozzle hole, and the upper computer of the nozzle increases the ink jet amount of the adjacent nozzle hole of the failed nozzle hole.
Further, when the upper computer of the nozzle receives the data sent by the image acquisition processing system, the upper computer of the nozzle can control the standby nozzle to perform ink jet operation on the operation paper besides changing the ink jet amount of the adjacent nozzle of the failed nozzle;
specifically, the host computer of shower nozzle is after receiving the data that image acquisition processing system sent, and the host computer of shower nozzle is analyzed data, acquires the serial number of trouble orifice, and no matter is certain orifice block up, or the ink droplet undersize, also perhaps spouts numerical value to one side too big, and the condition that leads to all probably leaves white in the below of trouble orifice, and to this, this application provides two kinds of solutions, the first: by increasing the ink jet amount of the adjacent jet orifice of the failed jet orifice, because the ink drop is left flat, the adjacent ink drop can cover the blank position left by the failed jet orifice, and the second scheme is as follows: adopt reserve shower nozzle, reserve shower nozzle is out of work at ordinary times, and when former shower nozzle broke down, the host computer of shower nozzle goes the spraying work of accomplishing the operation paper temporarily through reserve shower nozzle, and after former shower nozzle maintenance treatment was accomplished, the former shower nozzle of reuse worked.
As shown in fig. 2, a system for online detecting a nozzle hole state of a nozzle is based on the method for online detecting a nozzle hole state of a nozzle, and the system includes an image acquisition device 1, an image acquisition processing system 2, an upper computer 3 of a nozzle, an alarm processing unit 4 and an alarm device 5, wherein the image acquisition device 1 is connected with the image acquisition processing system 2, the image acquisition processing system 2 is respectively connected with the upper computer 3 of the nozzle and the alarm processing unit 4, and the alarm processing unit 4 is connected with the alarm device 5;
the image acquisition equipment 1 acquires a test chart image and sends the test chart image to the image acquisition and processing system 2, the image acquisition and processing system 2 judges whether the spray holes of the spray head have faults, the serial numbers of the fault spray holes and the reasons of the faults according to a preset spray detection chart and various threshold values, the data are respectively sent to the alarm processing unit 4 and the upper computer 3 of the spray head, the alarm processing unit 4 stores the data and controls the alarm device 5 to start for early warning, and after the upper computer 3 of the spray head receives the data, the ink jet quantity of adjacent spray holes is increased according to the serial numbers of the fault spray holes, or the spare spray head is directly controlled to work, and the spraying work of working paper is completed.
Further, the image acquisition equipment 1 is arranged behind the ink jet nozzle, one or more cameras are adopted, and the pixels of the cameras are determined by the size of a test chart to be acquired;
specifically, the image acquisition device 1 may be one or more cameras, the cameras may be area-array cameras or line-scan cameras, and in this scheme, no limitation is made, and if light is insufficient, illumination needs to be added to ensure that the acquisition cameras acquire clear images; the resolution of the acquisition camera is required to meet the precision requirement of the acquired image, and generally if the minimum ink droplet diameter is 0.04mm, the reference value of each pixel of the camera capable of resolving is 0.01-0.02 mm; the resolution of the cameras needs to meet the size of the image collected by each camera; the lens of gathering camera configuration can satisfy the field of view size that needs. For example, the size of an image to be acquired is 40mm, the selected camera is the line camera 4K, the size acquired by each pixel of the camera is 40/4000-0.01 mm/pixel, and if the size of an orifice ink droplet is 0.04mm, the accuracy requirement is met. In actual use, a single or a plurality of collecting cameras can be used, and the collecting cameras are determined according to factors such as the number of the spray heads, the size of ink drops, the printing width and the like.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, the meaning of "plurality" means at least two unless otherwise specified.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, and further, as used herein, connected may include wirelessly connected; the term "and/or" is used to include any and all combinations of one or more of the associated listed items.
Any process or method descriptions in flow charts or otherwise described herein may be understood as: represents modules, segments or portions of code which include one or more executable instructions for implementing specific logical functions or steps of a process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (9)
1. A method for online detecting the state of a spray hole of a spray head is characterized by comprising the following steps:
when the spray head works, the spray head prints a test chart at the head fixing position of the working paper at normal production speed;
acquiring the test chart through image acquisition equipment;
processing the acquired test chart through an image acquisition processing system to obtain ink jet state data of the nozzle orifice of the spray head;
and judging whether the spray hole of the spray head has a fault or not according to the ink jet state data.
2. The method for on-line detecting the nozzle hole state of the spray head according to claim 1, wherein the processing of the acquired test chart by the image acquisition and processing system comprises: the image acquisition processing system receives the test chart sent by the image acquisition equipment, compares the test chart with a preset spray detection chart, and calculates ink-jet state data according to pixels of the image acquisition equipment.
3. The method of claim 2, wherein the ink ejection status data includes a position number of a blocked nozzle, a droplet size of each nozzle, and a value of an oblique droplet ejection from the nozzle.
4. The method of claim 3, wherein said determining whether there is a failure at a nozzle hole of a nozzle head according to the ink ejection status data comprises: when the position number blocking the jet orifice is generated, the image acquisition processing system judges that the jet orifice has a fault, compares the ink droplet size of each jet orifice with a preset ink droplet size threshold value, when the ink droplet size is lower than the ink droplet size threshold value, namely the ink droplet is too small, the image acquisition processing system judges that the jet orifice has the fault, compares the value of the inclined jet of the ink droplet of the jet orifice with a preset inclined jet maximum threshold value, and when the value of the inclined jet of the ink droplet of the jet orifice exceeds the preset inclined jet maximum threshold value, the image acquisition processing system judges that the jet orifice has the fault.
5. The method for on-line detecting the status of the nozzle holes of the sprinkler according to claim 4, wherein when the image acquisition and processing system determines that the nozzle holes are in failure, the image acquisition and processing system sends the serial number of the failed nozzle holes of the sprinkler and the failure reason to an alarm processing unit and an upper computer of the sprinkler, and the alarm processing unit stores data sent by the image acquisition and processing system and starts an alarm device to perform early warning.
6. The method according to claim 5, wherein when the host computer of the nozzle receives the data sent by the image acquisition and processing system, the host computer of the nozzle analyzes the data to obtain the number of the failed nozzle, and the host computer of the nozzle increases the ink ejection amount of the nozzle adjacent to the failed nozzle.
7. The method according to claim 5, wherein when the host computer of the nozzle receives the data sent by the image acquisition and processing system, in addition to changing the ink-jetting amount of the adjacent nozzle with the failed nozzle, the host computer of the nozzle can control the spare nozzle to perform the ink-jetting operation on the operation paper.
8. A system for on-line detecting the state of spray holes of a spray head is characterized in that the system is based on the method for on-line detecting the state of spray holes of the spray head in claims 1-7, and the system comprises an image acquisition device, an image acquisition processing system, an upper computer of the spray head, an alarm processing unit and an alarm device, wherein the image acquisition device is connected with the image acquisition processing system, the image acquisition processing system is respectively connected with the upper computer of the spray head and the alarm processing unit, and the alarm processing unit is connected with the alarm device.
9. The system for on-line detection of the nozzle hole status of a nozzle according to claim 8, wherein the image capturing device is disposed behind the inkjet nozzle, and one or more cameras are used, and the pixels of the cameras are determined by the size of the test pattern to be captured.
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| Publication number | Priority date | Publication date | Assignee | Title |
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