A digital printing nozzle and a digital printer having the nozzle

Abstract

The present invention discloses a digital printing nozzle and a digital printer having the nozzle, comprising a housing, an inkjet cavity is arranged in the housing, the inkjet cavity is provided with an inkjet port; an inkjet plate is arranged at the inkjet port, the inkjet plate is provided with an inkjet channel, the inkjet channel is located at the inkjet port, the inkjet channel is divided into a plurality of sections along the length direction, and the aperture of the inkjet channel is gradually reduced in the direction away from the inkjet cavity. The present invention can control the ink output of the nozzle by means of pressure regulation and ensure the uniformity of ink output.

Description

Technical Field

[0001] The present invention relates to the technical field of digital printing, and more specifically, to a digital printing nozzle, and also to a digital printer having the digital printing nozzle. Background Art

[0002] The digital printing nozzle is the most critical component of the digital printing equipment. An inkjet cavity is formed inside the nozzle, which plays the role of storing ink. An inkjet channel is opened at the inkjet position of the nozzle. One end of the inkjet channel is connected to the inkjet cavity, and the other end is the outlet end, which is open to the outside for ink to be ejected. The nozzle usually has multiple inkjet channels. During the printing process, each inkjet channel in the nozzle can be controlled to open and close individually through electrical control, thereby achieving individual control of each point, which can ensure that the nozzle has a higher printing accuracy, making the digital printed image cleaner and suitable for digital printing of fabrics.

[0003] In digitally printed images, there are some large areas of the same color. In the process of inkjet printing, it is equivalent to dyeing only these areas, without fine control of the inkjet point. The current electronically controlled digital printing nozzles can fully realize the printing and dyeing of such areas of the same color. During the printing process, the inkjet channel is controlled by electronic control and switched to a fully open state, which can realize simultaneous inkjet, and can print and dye large areas of the same color.

[0004] The cost of electronically controlled digital printing nozzles is relatively high. Their advantage is that they can individually control the opening and closing of each inkjet channel. In the process of printing and dyeing large areas of the same color, there is a serious waste of performance. However, currently no ordinary nozzles can meet the requirements of digital printing.

[0005] Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a digital printing nozzle, which can control the ink output of the nozzle by pressure regulation and ensure the uniformity of the ink output.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a digital printing nozzle, comprising a shell, an inkjet cavity is arranged in the shell, and the inkjet cavity has an inkjet port; an inkjet plate is arranged at the inkjet port, and the inkjet plate has an inkjet channel, and the inkjet channel is located at the inkjet port, and the inkjet channel is divided into several sections along the length direction, and the aperture of the inkjet channel gradually decreases in the direction away from the inkjet cavity.

[0008] The present invention is further configured such that the inkjet plate is provided with at least two layers, including a first layer of inkjet plates, the first layer of inkjet plates is located on the side of the inkjet plates in each layer farthest from the inkjet cavity, and the first layer of inkjet plates is provided with a first through hole.

[0009] The present invention is further configured such that the aperture of the first through hole is less than 0.05 mm, and the length of the first through hole: the aperture of the first through hole>2.00.

[0010] The present invention is further configured such that the inkjet plate also includes a second layer of inkjet plate, the second layer of inkjet plate is stacked with the first layer of inkjet plate, the second layer of inkjet plate is provided with a second through hole, the second through hole corresponds to the first through hole one by one, and is interconnected to form two sections of the inkjet channel.

[0011] The present invention is further configured such that the aperture of the second through hole is larger than the aperture of the first through hole and smaller than 0.3 mm; and the length of the second through hole is 0.30-1.00 mm.

[0012] The present invention is further configured such that the aperture of the first through hole is the aperture of the outlet end of the inkjet channel, and the length of the inkjet channel: the aperture of the outlet end of the inkjet channel>20.00.

[0013] The present invention is further configured such that the shell has an opening connected to the inkjet chamber, a cover plate is provided at the opening, the cover plate and the shell are sealed by a sealing ring, the cover plate has an ink inlet hole and an ink return hole; and also includes an inkjet sensor for controlling the pressure in the inkjet chamber.

[0014] The present invention is further configured such that the inner wall of the inkjet cavity is provided with a bottom surface, and the inkjet port is opened on the bottom surface; it also includes a pressure block and a sealing ring 1, and the sealing ring 1 is located on the bottom surface of the inkjet cavity and corresponds to the peripheral position of the inkjet port; the pressure block, inkjet plate, sealing ring 1 and the bottom surface of the inkjet cavity are successively abutted to realize the sealing of the inkjet port.

[0015] The present invention is further configured such that the inkjet plate abuts against a plane on one side of the pressing block, the pressing block is provided with a guide hole, each inkjet channel is located within the contour range of the guide hole, and a filter is provided at one end of the guide hole facing away from the inkjet plate;

[0016] The present invention is further configured such that a plurality of inkjet channels are provided and distributed in an array, the shape of the inkjet port is adapted to the distribution shape of each inkjet channel, and each inkjet channel is located in the inkjet port.

[0017] The present invention also provides a digital printer, comprising a plurality of digital printing nozzles as described above, wherein the digital printing nozzles are distributed in an array and are used together to realize inkjet printing.

[0018] In summary, the present invention has the following beneficial effects:

[0019] The inkjet channel of the nozzle is divided into several sections along the length direction, and the aperture of the inkjet channel is gradually reduced towards the outlet end. The aperture of the outlet end of the inkjet channel is small, and the overall length-diameter ratio of the inkjet channel is large, which can improve the fineness and straightness of the inkjet channel when it is discharged, ensuring that each inkjet channel can achieve inkjet printing evenly and stably.

[0020] The inkjet chamber is provided with an ink inlet hole and an ink return hole. Ink can be supplied to the inkjet chamber through the ink inlet hole. The supplied pressure can be converted into the pressure inside the inkjet chamber. The nozzle can realize inkjet control of the inkjet channel according to the pressure conditions. The ink return hole can provide ink reflux in the inkjet chamber, realize the pressure relief treatment inside the inkjet chamber, and provide gas in the nozzle to discharge, so as to keep the nozzle working stably.

[0021] In a digital printer, each digital printing nozzle is installed at the inkjet mechanism of the digital printer to play the role of inkjet printing. Each digital printing nozzle can be connected to different colors of ink to achieve different colors of printing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional diagram of a digital printing nozzle in this embodiment;

[0023] Figure 2 The explosion of a digital printing nozzle in this embodiment Figure 1 ;

[0024] Figure 3 The explosion of a digital printing nozzle in this embodiment Figure 2 ;

[0025] Figure 4 The explosion of a digital printing nozzle in this embodiment Figure 3 ;

[0026] Figure 5 is a cross-sectional view of a digital printing nozzle in this embodiment;

[0027] Figure 6 The structure of the inkjet channel of the two-layer inkjet plate in this embodiment is schematically shown. Figure 1 ;

[0028] Figure 7 The structure of the inkjet channel of the two-layer inkjet plate in this embodiment is schematically shown. Figure 2 .

[0029] Figure numerals: 1. Shell; 11. Inkjet cavity; 12. Bottom surface; 13. Inkjet port; 2. Cover plate; 21. Ink inlet hole; 211. Bump; 212. Extension port; 22. Ink return hole; 3. Press block; 31. Guide hole; 311. Step groove; 4. Sealing ring one; 5. Inkjet plate; 501. Inkjet channel; 502. Outlet end; 51. First layer of inkjet plate; 511. First through hole; 52. Second layer of inkjet plate; 521. Second through hole; 6. Filter plate; 7. Filter pressing plate; 8. Sealing ring two. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] This embodiment discloses a digital printing nozzle, referring to Figure 1-Figure 5 As shown, the shell 1 includes an inkjet cavity 11 , and one side of the shell 1 is used as an inkjet layer and is provided with an inkjet port 13 , through which the ink of the nozzle is ejected.

[0032] An inkjet plate 5 is arranged at the inkjet port 13, and a sealing structure is formed between the inkjet plate 5 and the inkjet port 13. A plurality of inkjet channels 501 are opened at a roughly middle position of the inkjet plate 5. The inkjet channels 501 are connected to the inkjet cavity 11, and an outlet end 502 of the inkjet channel 501 is formed at one end of the inkjet channel 501 away from the inkjet cavity 11, and ink is sprayed out from the outlet end 502.

[0033] Generally, the ink jet port 13 is located at the bottom of the housing 1, an opening is formed at the top of the housing 1, a cover plate 2 is installed at the opening, and the connection between the housing 1 and the cover plate 2 is sealed by a sealing ring 8. The opening allows the components inside the nozzle body to enter and exit, so as to facilitate the assembly of the components inside the ink jet chamber 11.

[0034] An ink inlet hole 21 and an ink return hole 22 are provided on the cover plate 2, wherein the ink inlet hole 21 is connected to the ink inlet tube to supply ink to the inkjet cavity 11; the ink return hole 22 is connected to the ink return tube to allow the ink in the inkjet cavity 11 to flow back and the gas in the nozzle to be discharged to keep the nozzle working stably. A protrusion 211 is formed on the inner side of the cover plate 2 facing the inkjet cavity 11, the ink inlet hole 21 is located at the upper part of the protrusion 211, the lower end of the ink inlet hole 21 extends to the side of the protrusion 211, and an extension port 212 is formed on the side of the protrusion 211, and the extension port 212 extends in a lateral direction, thereby preventing the inkjet port 13 from directly discharging ink toward the inkjet channel 501, and avoiding the inkjet channel 501 from generating fluctuations in ink pressure.

[0035] In addition, an inkjet sensor may be installed in the inkjet cavity 11. The inkjet sensor can detect the ink pressure in the inkjet cavity 11, and the nozzle can be controlled by controlling the ink pressure.

[0036] Since the inkjet cavity is provided with an ink inlet hole and an ink return hole, ink can be supplied to the inkjet cavity through the ink inlet hole, and the supplied pressure can be converted into the pressure inside the inkjet cavity. When the nozzle needs to spray ink, pressure is provided to the inkjet cavity from the ink inlet hole, the internal pressure of the inkjet cavity increases, and the inkjet channel can spray ink outward to realize inkjet printing.

[0037] Since the aperture of the inkjet channel is small and the aspect ratio is angled, the inkjet channel is long and narrow, the inkjet fineness is small, the total amount of ink output is small, and the ink output accounts for a relatively small proportion of the total amount of ink in the inkjet cavity, which is conducive to maintaining the pressure inside the inkjet cavity. During the inkjet process, the pressure inside the inkjet cavity can be basically kept stable. The relatively stable internal pressure in the inkjet cavity can maintain the inkjet channel to output ink stably and evenly throughout the entire process of inkjet.

[0038] The ink return hole can provide ink reflux in the inkjet cavity, can achieve pressure relief inside the inkjet cavity, and can discharge gas in the nozzle to keep the nozzle working stably. When the inkjet needs to stop printing, the ink inlet hole stops supplying pressure, and the ink return hole can relieve the pressure inside the inkjet cavity, so that the inkjet cavity is in a stable pressure state, the inkjet channel can stop spraying ink outward, and the nozzle stops printing.

[0039] Reference Figure 3 , Figure 5 As shown, the inner wall of the bottom of the inkjet cavity 11 is provided with a bottom surface 12, and the inkjet port 13 is opened on the bottom surface 12. The inkjet plate 5 is provided with a plurality of inkjet channels 501, and each inkjet channel is distributed in an array to form a dot structure of inkjet. The shape of the inkjet port 13 is adapted to the distribution shape of each inkjet channel 501, and each inkjet channel 501 is located in the inkjet port 13, so that the ink ejected from each inkjet channel 501 can be ejected from the inkjet channel 501.

[0040] A pressing block 3 and a sealing ring 4 are also provided inside the inkjet cavity 11. The sealing ring 4 is located on the bottom surface 12 of the inkjet cavity 11 and corresponds to the outer peripheral position of the inkjet port 13. The pressing block 3, the inkjet plate 5, the sealing ring 4 and the bottom surface 12 of the inkjet cavity 11 are abutted against each other in sequence, and the sealing ring 4 realizes the sealing at the edge of the inkjet port 13. Specifically, the pressing block 3 can be locked and fixed between the housing 1 by bolts.

[0041] Reference Figure 2 , Figure 3 , Figure 5 As shown, the upper plane of the inkjet plate 5 abuts against the lower plane of the pressing block 3, and the shape of the pressing block 3 matches the inner contour of the inkjet cavity 11. A guide hole 31 is provided in the middle of the pressing block 3, the guide hole 31 passes through the pressing block 3 from top to bottom, and each inkjet channel 501 is located within the contour range of the guide hole 31, and the ink flows to the inkjet channel 501 through the guide hole 31 of the pressing block 3.

[0042] In order to realize the filtering of the ink, the end of the flow guide hole 31 facing away from the inkjet plate 5, that is, the upper side of the pressing block 3, is installed with a filter 6, which can completely cover the upper end of the flow guide hole 31, and then the ink can be filtered through the filter 6 to prevent the impurities that may exist in the ink from clogging the inkjet channel 501. In addition, a stepped groove 311 is provided on the upper side of the pressing block 3, and the filter 6 is embedded in the stepped groove 311 to achieve the limiting effect on the filter 6; and a filter pressing plate 7 is installed on the upper part of the pressing block 3. The filter pressing plate 7 is roughly annular in structure and is connected to the pressing block 3 by bolts, so that the filter pressing plate 7, the filter 6 and the pressing plate are stacked in sequence to achieve the installation and fixation of the filter 6.

[0043] Reference Figure 2 , Figure 3 As shown, the inkjet plate 5 adopts a multi-layer stacked structure, and through holes are provided on each layer of the inkjet plate 5. The positions of the through holes correspond to each other, and the through holes in each layer of the inkjet plate 5 are interconnected, that is, forming an inkjet channel 501. The apertures of the through holes of each layer of the inkjet plate 5 are different, specifically, the aperture in the direction of the outlet end 502 of the inkjet channel 501 is smaller, so that the inkjet channel 501 is divided into several sections along the length direction, and the aperture of the inkjet channel 501 is gradually reduced in the direction away from the inkjet cavity 11. At the end of the inkjet channel 501, that is, the outlet end 502, an ultra-fine hole is formed, so that the fineness of the ejected ink is finer. Generally, the aperture of the outlet end 502 of the inkjet channel 501 is less than 0.05 mm.

[0044] Specifically, the number of layers of the inkjet plate 5 is at least two. Take two layers as an example, specifically including a first inkjet plate 51 and a second inkjet plate 52, wherein the first inkjet plate 51 is located on the side farthest from the inkjet cavity 11 among the inkjet plates 5, and the first inkjet plate 51 is provided with a first through hole 511. The first through hole 511 is the outlet end 502 of the inkjet channel 501, and the aperture of the first through hole 511 is the aperture of the outlet end 502. Generally, the aperture of the first through hole 511 is less than 0.05 mm, and the length of the first through hole 511: the aperture of the first through hole 511>2.00. The larger aspect ratio makes the flow channel of the outlet end 502 of the inkjet channel 501 relatively narrow and long, which can increase the smoothness of ink discharge.

[0045] The second layer of inkjet plate 52 is stacked with the first layer of inkjet plate 51, and the second layer of inkjet plate 52 is located inside the first layer of inkjet plate 51, and they are flatly attached to each other. The second layer of inkjet plate 52 is provided with a second through hole 521, and the second through hole 521 corresponds to the first through hole 511 one by one, and is interconnected. The second through hole 521 and the first through hole 511 form two sections of the inkjet channel 501, and the aperture gradually decreases from the second through hole 521 to the first through hole 511 (exit end 502). Generally, the aperture of the second through hole 521 is larger than the aperture of the first through hole 511, and is less than 0.3 mm, and the length of the second through hole 521 is 0.30-1.00 mm.

[0046] The first through hole 511 serves as an ink outlet, and its smaller aperture can ensure the fineness of the ink when it is sprayed out. The second through hole 521 serves as a guide, and can limit the axial aperture size of the inkjet channel 501, thereby increasing the overall aperture length of the inkjet channel 501, and further greatly increasing the overall long diameter length of the inkjet channel 501, thereby improving the straightness of the ink when it is sprayed out and the accuracy of inkjet from the nozzle.

[0047] Reference Figure 6 As shown, in this embodiment, the overall aspect ratio of the inkjet channel 501 is X, the overall length of the inkjet channel 501 is L, the aperture of the outlet end 502 of the inkjet channel 501 is D, the aperture of the first through hole 511 is d1, the length of the first through hole 511 is a1, the aperture of the second through hole 521 is d2, and the length of the second through hole 521 is a2; then, X=L / D=(a1+a2) / d1. By increasing the length of the second through hole 521, the length of the entire inkjet channel 501 can be increased, and thus the overall aspect ratio of the entire inkjet channel 501 can be significantly increased. In general, the overall aspect ratio of the inkjet channel 501 can reach more than 20.

[0048] Specifically, in this embodiment, the aperture (d1) of the first through hole 511 is 0.02 mm, the length (a1) of the first through hole 511 is 0.05 mm, the aperture (d2) of the second through hole 521 is 0.20 mm, and the length (a2) of the second through hole 521 is 0.49, then the overall aspect ratio of the inkjet channel 501 is X=(0.05+0.49) / 0.02=27. Since the overall aspect ratio of the inkjet channel 501 is relatively large, the overall straightness of the inkjet channel 501 can be greatly increased, the straightness of the ink ejected from the inkjet channel 501 can be improved, and the smoothness of the ink in the inkjet channel 501 can be improved, thereby greatly increasing the inkjet accuracy of the nozzle.

[0049] Since each layer of inkjet plate 5 is a flat plate structure, the length of the through hole of each layer of inkjet plate 5 is the thickness of each layer of inkjet plate 5. By machining through holes of corresponding sizes on inkjet plates 5 of different thicknesses, inkjet plates 5 of corresponding layers can be obtained. Since the aperture of the first through hole 511 of the first layer of inkjet plate 51 is very small, the first through hole 511 is difficult to machine. In this embodiment, by reducing the thickness of the first layer of inkjet plate 51, the smaller thickness can improve the machining accuracy of the first through hole 511 of the first layer of inkjet plate 51, making it easier to machine. The second through hole 521 of the stacked second inkjet plate 5 is used as an auxiliary ink guide hole to guide the water jet before spraying, thereby improving the straightness of the ink jet as a whole and improving the inkjet accuracy of the nozzle.

[0050] Taking the above parameters as an example, the diameter (d1) of the first through hole 511 is 0.02 mm, the length (a1) of the first through hole 511 is 0.05 mm, the diameter (d2) of the second through hole 521 is 0.20 mm, and the length (a2) of the second through hole 521 is 0.49. Figure 7 As shown, when the first through hole 511 and the second through hole 521 are in a coaxial state, the maximum jetting inclination angle A of the inkjet channel 501 is about 6°. If the aperture (d2) of the second through hole 521 is appropriately reduced, the maximum jetting inclination angle A of the inkjet channel 501 will be further reduced. Since the aperture of the second through hole 521 is slightly larger, approximately ten times the aperture of the first through hole 511, its processing difficulty is relatively simple. Therefore, appropriately reducing the aperture of the second through hole 521 will not increase its processing difficulty.

[0051] Alternatively, in this embodiment, the number of layers of the inkjet plate 5 can also adopt a three-layer stacked structure, or a multi-layer stacked structure. The multi-layer structure can extend the length of the guide section in the inkjet channel 501, thereby maintaining the stability of the ink during ejection and further improving the straightness of the ink ejection.

[0052] Comparative Example 1: If the inkjet plate 5 only adopts a single-layer structure, that is, only a single-layer first-layer inkjet plate 51 is used, the inkjet channel 501 also only consists of the first through hole 511. The aperture (d1) of the first through hole 511 is still controlled to be 0.02 mm. At this time, if the overall long diameter of the inkjet channel 501 reaches more than 20, the length a1' of the first through hole 511 needs to reach more than 0.40 mm. Compared with a1=0.05 mm in this embodiment, the required length of the first through hole 511 will be greatly increased, and the difficulty of processing the first through hole 511 will be greatly increased. In addition, the length of the first through hole 511 is longer, and various process parameters such as its runout and eccentricity need to be controlled during the processing, which will double the difficulty of processing the ultra-micro hole.

[0053] Comparative Example 2: If the inkjet plate 5 only adopts a single-layer structure, that is, only a single-layer first-layer inkjet plate 51 is used, and the inkjet channel 501 is also composed of only the first through hole 511. The aperture (d1) of the first through hole 511 is still controlled to be 0.02 mm. At this time, if the maximum jetting inclination angle A of the inkjet channel 501 is to be controlled to be about 6°, the length a1' of the first through hole 511 needs to be about 0.20 mm, which needs to be about four times the length of the first through hole 511 (a1=0.05 mm) in the above embodiment, and the processing difficulty of the first-layer inkjet plate 51 will be increased accordingly, which will also double the processing difficulty of the ultra-fine hole.

[0054] This embodiment also discloses a digital printer, including a plurality of digital printing heads as in the above embodiment, each digital printing head is distributed in an array and installed at the inkjet mechanism of the digital printer, and together plays the role of inkjet printing. Each digital printing head can be connected to ink of different colors, thereby realizing printing operations of different colors.

[0055] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A digital printing nozzle, characterized in that: The invention comprises a shell (1), wherein an inkjet cavity (11) is arranged in the shell (1), and the inkjet cavity (11) is provided with an inkjet port (13); an inkjet plate (5) is arranged at the inkjet port (13), and the inkjet plate (5) is provided with an inkjet channel (501), and the inkjet channel (501) is located at the inkjet port (13); the inkjet channel (501) is divided into a plurality of sections along the length direction, and the aperture of the inkjet channel (501) gradually decreases in the direction away from the inkjet cavity (11); The inkjet plate (5) is provided with at least two layers, including a first layer of inkjet plates (51), the first layer of inkjet plates (51) is located on the side of each layer of the inkjet plates (5) farthest from the inkjet cavity (11), and the first layer of inkjet plates (51) is provided with a first through hole (511); The diameter of the first through hole (511) is less than 0.05 mm, and the length of the first through hole (511):the diameter of the first through hole (511)>2.00; The inkjet plate (5) further comprises a second layer of inkjet plate (52), wherein the second layer of inkjet plate (52) is stacked with the first layer of inkjet plate (51), and the second layer of inkjet plate (52) is provided with a second through hole (521), and the second through hole (521) corresponds to the first through hole (511) one by one and is interconnected to form two sections of the inkjet channel (501); The aperture of the second through hole (521) is larger than the aperture of the first through hole (511) and smaller than 0.3 mm; the length of the second through hole (521) is 0.30-1.00 mm; The aperture of the first through hole (511) is the aperture of the outlet end (502) of the inkjet channel (501), and the length of the inkjet channel (501): the aperture of the outlet end (502) of the inkjet channel (501)>20.00; The inkjet channels (501) are provided in a plurality and distributed in an array. The shape of the inkjet port (13) is adapted to the distribution shape of each inkjet channel (501), and each inkjet channel (501) is located in the inkjet port (13).

2. A digital printing nozzle according to claim 1, characterized in that: The shell (1) is provided with an opening connected to the inkjet chamber (11), a cover plate (2) is arranged at the opening, the cover plate (2) and the shell (1) are sealed by a second sealing ring (8), the cover plate (2) is provided with an ink inlet hole (21) and an ink return hole (22); and an inkjet sensor is also included for controlling the pressure in the inkjet chamber (11).

3. A digital printing nozzle according to claim 1, characterized in that: The inner wall of the inkjet cavity (11) is provided with a bottom surface (12), and the inkjet port (13) is opened on the bottom surface (12); it also includes a pressing block (3) and a sealing ring (4), wherein the sealing ring (4) is located on the bottom surface (12) of the inkjet cavity (11) and corresponds to the peripheral position of the inkjet port (13); the pressing block (3), the inkjet plate (5), the sealing ring (4) and the bottom surface (12) of the inkjet cavity (11) are abutted in sequence to realize the sealing of the inkjet port (13).

4. A digital printing nozzle according to claim 3, characterized in that: The inkjet plate (5) is in contact with a plane on one side of the pressing block (3); the pressing block (3) is provided with a guide hole (31); each inkjet channel (501) is located within the contour of the guide hole (31); and a filter (6) is provided at one end of the guide hole (31) facing away from the inkjet plate (5).

5. A digital printer, characterized in that: It comprises a plurality of digital printing nozzles as claimed in claim 1, each of the digital printing nozzles is distributed in an array and is used together to realize inkjet printing.

Images