Digital jet printing equipment

Abstract

The utility model provides digital jet printing equipment which comprises a printing trolley which comprises a spray head assembly. The first moisturizing device is provided with a first moisturizing cavity, the first moisturizing cavity is opened, and the first moisturizing cavity is used for containing liquid so that the spray head assembly can be soaked in the liquid; the second moisturizing device is provided with a second moisturizing cavity, and the second moisturizing cavity is used for being connected with a nozzle bottom plate of the printing trolley in an abutting mode to form a closed cavity for containing the nozzle assembly; the driving part is used for driving the spray head assembly to descend or driving the first moisturizing device to ascend, so that the spray head assembly is soaked in the liquid; the driving part is further used for driving the spray head assembly to descend or driving the second moisturizing device to ascend so that the spray head assembly can be contained in the closed cavity. According to the digital jet printing equipment, through the arrangement of the first moisturizing device and the second moisturizing device, the printing spray head can be moisturized according to different blocking degrees of the printing spray head, and a better moisturizing effect can be achieved aiming at different blocking conditions.

Description

Technical Field

[0001] This application belongs to the field of digital printing technology, and more specifically, relates to a digital inkjet printing device. Background Technology

[0002] During the operation of digital inkjet printing equipment, the ink inside the printhead is easily dried and forms particles that remain inside the printhead due to prolonged exposure to air. This can cause the nozzles to become clogged, affecting print quality and even preventing normal printing. Therefore, it is necessary to keep the printhead moist.

[0003] Existing digital inkjet printing equipment typically has a humidification tray at one end of the printing platform to moisturize the printhead. However, when the printhead is idle for varying periods, the degree of clogging also varies, and the humidification tray cannot achieve optimal moisturizing effects for printheads with different levels of clogging. Utility Model Content

[0004] The purpose of this application is to provide a digital inkjet printing device to solve the technical problem that existing moisturizing discs cannot achieve a good moisturizing effect on printheads with different degrees of clogging.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a digital inkjet printing device, comprising:

[0006] Printing carriage, including printhead assembly;

[0007] A first moisturizing device, the first moisturizing device having a first moisturizing chamber, the first moisturizing chamber being open, the first moisturizing chamber being used to hold liquid for the nozzle assembly to be immersed in the liquid;

[0008] The second moisturizing device has a second moisturizing chamber, which is used to abut against the nozzle base plate of the printing carriage to form a sealed cavity for accommodating the nozzle assembly.

[0009] A driving component is provided to drive the nozzle assembly to descend or drive the first moisturizing device to rise, so that the nozzle assembly is immersed in the liquid; the driving component is also used to drive the nozzle assembly to descend or drive the second moisturizing device to rise, so that the nozzle assembly can be accommodated in the sealed cavity.

[0010] In some embodiments, the drive member is disposed on the printing carriage, and the drive member drives the printhead assembly to descend a first preset distance so that the printhead assembly is immersed in the liquid; the drive member also drives the printhead assembly to descend a second preset distance so that the printhead assembly is accommodated in the sealed cavity.

[0011] In some embodiments, the digital inkjet printing device further includes a printing platform, and the printing carriage is slidably disposed above the printing platform along a first direction;

[0012] The first moisturizing device and the second moisturizing device are respectively located at opposite ends of the printing platform along the first direction.

[0013] In some embodiments, the digital inkjet printing equipment further includes a frame, the printing carriage is slidably disposed on the frame, and the first moisturizing device is detachably mounted on the frame.

[0014] In some embodiments, the first moisturizing device is mounted to the frame by means of fastener locking or snap-fit.

[0015] In some embodiments, the first moisturizing device includes a first moisturizing tray, the first moisturizing tray including a tray body and a flange formed on the top side edge of the tray body, the flange overlapping the crossbeam of the frame and locked by fasteners.

[0016] In some embodiments, the frame has a first space, in which the first moisturizing device and the protective plate are sequentially disposed. The protective plate and the first moisturizing device divide the first space from top to bottom into a first cavity, a second cavity and a third cavity sequentially disposed. The first cavity is used to accommodate the printing carriage, the third cavity is used to install circuit components, and the second cavity provides maintenance space for the printing carriage when the first moisturizing device is removed.

[0017] In some embodiments, the protective plate is connected to the opposite ends of the frame along the second direction at opposite ends;

[0018] The protective plate is flush with the opposite sides of the first moisturizing device along the first direction on both sides of the first direction.

[0019] Alternatively, the protective plate extends outward from opposite sides of the first moisturizing device along the first direction.

[0020] In some embodiments, the digital inkjet printing equipment further includes an electrical control cabinet, which is mounted on the inner side wall of the frame.

[0021] In some embodiments, the orthographic projection of the electrical control cabinet is located outside the orthographic projection of the printing carriage in the vertical direction.

[0022] The beneficial effects of the digital inkjet printing equipment provided in this application are as follows: by setting up a first moisturizing device and a second moisturizing device, the printhead can be moisturized daily through the second moisturizing device under normal printing operation; when long-term shutdown is required, the printhead can be moisturized for a long period of time through the first moisturizing device. In general, the digital inkjet printing equipment of this application can moisturize the printhead according to its usage, that is, it can moisturize the printhead according to different degrees of clogging, thus achieving a better moisturizing effect for different clogging conditions. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A three-dimensional structural diagram of the printing carriage in a moisturized state in the digital inkjet printing equipment provided in the embodiments of this application;

[0025] Figure 2 A three-dimensional structural diagram of the printing carriage after it has risen in the digital inkjet printing equipment provided in this application embodiment;

[0026] Figure 3 This is a schematic diagram of the structure of the first moisturizing device and the printhead assembly in a moisturizing state in the digital inkjet printing equipment provided in the embodiments of this application;

[0027] Figure 4 This is a schematic diagram of the second moisturizing device and printhead assembly in a moisturizing state in the digital inkjet printing equipment provided in the embodiments of this application.

[0028] Figure 5 This is a schematic diagram of the structure of the first space corresponding to the digital inkjet printing equipment provided in the embodiments of this application;

[0029] Figure 6 for Figure 5 A magnified structural diagram of part A in the middle;

[0030] Figure 7 A schematic diagram of the structure of the digital inkjet printing equipment provided in the embodiments of this application after setting the first maintenance door, the second maintenance door and the third maintenance door.

[0031] The following are the labeling elements in the figure:

[0032] 100. Frame; 110. Front side panel; 120. Rear side panel; 130. Top side panel; 140. Bottom side panel; 150. Crossbeam; 151. Second mounting hole; 160. Protective plate; 170. First maintenance door; 180. Second maintenance door; 190. Third maintenance door; 101. First space; 1011. First cavity; 1012. Second cavity; 1013. Third cavity; 102. Second space; 103. Third space; 20 0. Printing platform; 300. Printing carriage; 310. Nozzle assembly; 400. First humidification device; 410. First humidification disc; 411. Disc body; 412. Flange; 4121. First mounting hole; 413. First humidification chamber; 500. Second humidification device; 510. Second humidification chamber; 520. Sealing ring; 600. Circuit assembly; 700. Electrical control cabinet; 800. Guide rail; X, first direction; Y, second direction. Detailed Implementation

[0033] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0034] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0035] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0037] Please see Figures 1 to 4The digital inkjet printing device provided in the embodiments of this application will now be described. The digital inkjet printing device includes a printing carriage 300, a first moisturizing device 400, a second moisturizing device 500, and a driving component. The printing carriage 300 includes a printhead assembly 310. The first moisturizing device 400 has a first moisturizing cavity 413, which is open and used to hold liquid for immersing the printhead assembly 310 in the liquid. The second moisturizing device 500 has a second moisturizing cavity 510, which abuts against the printhead base plate of the printing carriage 300 to form a sealed cavity for accommodating the printhead assembly 310. The driving component is used to drive the printhead assembly 310 to descend or drive the first moisturizing device 400 to rise, so that the printhead assembly 310 is immersed in the liquid. The driving component is also used to drive the printhead assembly 310 to descend or drive the second moisturizing device 500 to rise, so that the printhead assembly 310 can be accommodated in the sealed cavity.

[0038] The liquid in the first moisturizing chamber 413 can be clean water or cleaning fluid. During normal operation of the printing carriage 300, the first moisturizing chamber 413 can be empty to avoid excessive liquid causing sloshing when the printing carriage 300 moves. When the printing carriage 300 needs to be shut down for an extended period, clean water can be injected into the first moisturizing chamber 413 to immerse the printhead assembly 310. When a thorough cleaning of the printhead assembly 310 is required, cleaning fluid can also be injected into the first moisturizing chamber 413. The cleaning fluid can be a liquid with dissolving properties. Immersing the printhead assembly 310 in the cleaning fluid can dissolve hard-to-clean solidified substances on the printhead, thereby achieving a deep cleaning of the printhead assembly 310.

[0039] The second moisturizing chamber 510 abuts against the printhead base plate of the printing carriage 300 to form a sealed cavity for accommodating the printhead assembly 310. When routine moisturizing maintenance of the printhead assembly 310 is required, the printhead assembly 310 can be lowered or the second moisturizing device 500 can be raised by a drive component, so that the printhead assembly 310 can be accommodated in the sealed cavity. The sealed cavity provides a closed environment for the printhead assembly 310, preventing the printhead from drying out and affecting printing. Furthermore, to better moisturize the printhead assembly 310, liquid can be injected into the second moisturizing chamber 510 or the liquid can be atomized to increase the air humidity inside the second moisturizing chamber 510. Even further, absorbent cotton can be placed inside the second moisturizing chamber 510. After absorbing the liquid, the absorbent cotton can better store the liquid, allowing the second moisturizing chamber 510 to maintain a more durable moist environment.

[0040] In this application, the second moisturizing device 500 is mainly used to moisturize the printhead assembly 310 under normal use. For example, during a short pause in continuous printing, the print carriage 300 can be moved to the second moisturizing chamber 510 so that the printhead base plate of the printhead assembly 310 abuts against the second moisturizing chamber 510, allowing the printhead assembly 310 to be housed within the sealed chamber, thus providing short-term moisturization and preventing the ink on the printhead of the printhead assembly 310 from drying out. When the print carriage 300 needs to be shut down for an extended period (e.g., production is suspended), the printhead assembly 310 can be immersed in the first moisturizing chamber 413 for moisturization. In this way, moisturization can be achieved through both the first moisturizing device 400 and the second moisturizing device 500 depending on the usage of the print carriage 300, ensuring the moisturizing effect on the printhead assembly 310.

[0041] The digital inkjet printing device in this embodiment, by setting up a first moisturizing device 400 and a second moisturizing device 500, allows the printhead to be moisturized daily through the second moisturizing device 500 during normal printing operations; and when long-term shutdown is required, the printhead can be moisturized for an extended period through the first moisturizing device 400. In general, the digital inkjet printing device of this application can moisturize the printhead according to its usage, that is, it can moisturize the printhead according to different degrees of clogging, thus achieving a better moisturizing effect for different clogging conditions.

[0042] In some embodiments, please refer to Figure 4 A sealing ring 520 can be installed at the top opening of the second moisturizing chamber 510. When the printhead assembly 310 descends, the printhead base plate of the printing carriage 300 can abut against the sealing ring 520 to ensure the sealing of the sealed cavity formed by the printhead base plate and the second moisturizing chamber 510, thereby achieving moisturization of the printhead assembly 310 and ensuring the moisturizing effect. Furthermore, since the second moisturizing device 500 is a conventional existing moisturizing device, it will not be described in detail here.

[0043] In some embodiments, a drive unit is mounted on the printing carriage 300. The drive unit drives the printhead assembly 310 to descend a first preset distance, immersing the printhead assembly 310 in liquid. The drive unit also drives the printhead assembly 310 to descend a second preset distance, allowing the printhead assembly 310 to be accommodated in a sealed cavity. This configuration effectively utilizes the drive unit that lowers the printhead assembly 310 during operation. By controlling the printhead assembly 310 to the first and second preset distances via a program, different hydration methods can be achieved, simplifying the structure and saving costs.

[0044] The first preset distance and the second preset distance can be set according to the distance between the first moisturizing cavity 413 and the second moisturizing cavity 510 and the nozzle assembly 310. In this embodiment, the first preset distance and the second preset distance can be unequal. For example, the first preset distance is greater than the second preset distance, so that the nozzle assembly 310 can be immersed in the first moisturizing cavity 413.

[0045] It is understood that in other embodiments, driving members may also be provided for the first moisturizing device 400 and the second moisturizing device 500 to raise and lower the first moisturizing device 400 and the second moisturizing device 500 respectively, and this is not the only one.

[0046] In some embodiments, please refer to Figure 1 and Figure 2 The digital inkjet printing equipment also includes a printing platform 200, a printing carriage 300 which is slidably disposed above the printing platform 200 along the first direction X; a first moisturizing device 400 and a second moisturizing device 500 are respectively disposed on the outside of opposite ends of the printing platform 200 along the first direction X.

[0047] Wherein, the first direction X is the printing direction of the printing carriage 300. When printing, the printing medium is first laid on the printing platform 200, and then the printing carriage 300 is moved above the printing medium. During the printing process, the printing carriage 300 can move along the first direction X so that the image can be printed at each position of the printing medium.

[0048] It should be noted that the printing platform 200 is located outside the two opposite ends along the first direction X, where the two opposite ends refer to the positions outside the ends of the printing platform 200. When the printing carriage 300 is in a stopped state, the printing carriage 300 can be moved to a position outside the two opposite ends of the printing platform 200 for moisturizing, so as to avoid structural interference between the first moisturizing device 400 and the second moisturizing device 500 and the printing work of the printing carriage 300.

[0049] The above configuration allows the printhead assembly 310 to be moisturized simply by moving the print carriage 300 along the first direction X to the opposite ends of the print platform 200. This utilizes the space at the opposite ends of the print platform 200 along the first direction X, and the drive device used to move the print carriage 300 can also be used to move the print carriage 300 to the two moisturizing positions. At the same time, the sliding guide rail 800 of the print carriage 300 can be used, simplifying the driving, guiding, and space requirements for moisturizing the print carriage 300. Understandably, in other embodiments of this application, the first moisturizing device 400 and the second moisturizing device 500 may also be disposed at the same end of the printing platform 200 along the first direction X. For example, the first moisturizing device 400 may be disposed between the second moisturizing device 500 and the printing platform 200, or the second moisturizing device 500 may be disposed between the first moisturizing device 400 and the printing platform 200. Furthermore, if the internal cavity allows, the first moisturizing device 400 and the second moisturizing device 500 may also be disposed at opposite ends of the printing platform 200 along the second direction Y, wherein the second direction Y is perpendicular to the first direction X and perpendicular to the vertical direction.

[0050] In some embodiments, please refer to Figure 1 and Figure 2 The digital inkjet printing equipment also includes a frame 100, a printing carriage 300 slidably mounted on the frame 100, and a first moisturizing device 400 detachably mounted on the frame 100. This arrangement allows the first moisturizing device 400 to be disassembled, maintained, or replaced after prolonged use. Furthermore, when maintenance is required on other parts of the digital inkjet printing equipment, the first moisturizing device 400 can be disassembled to provide more maintenance space and facilitate operator access. For example, when it is necessary to observe or maintain the printhead assembly 310, the printing carriage 300 can be moved directly above the first moisturizing device 400, and the first moisturizing device 400 can be disassembled to increase maintenance space, thereby enabling maintenance and repair of the printhead assembly 310.

[0051] In some embodiments, please refer to Figure 5 and Figure 6 The first moisturizing device 400 is mounted to the frame 100 by fasteners. Specifically, the first moisturizing device 400 has a first mounting hole 4121, and the frame 100 has a second mounting hole 151. Fasteners pass through the first mounting hole 4121 and the second mounting hole 151 respectively, locking the first moisturizing device 400 to the frame 100. Disassembly and assembly are simple; the first moisturizing device 400 can be removed by rotating the fasteners. Disassembly is convenient, and the reliability of the first moisturizing device 400 after assembly is guaranteed.

[0052] In some embodiments, please refer to Figure 2 , Figure 5 and Figure 6 The frame 100 includes a front side plate 110, a rear side plate 120, a top side plate 130, and a bottom side plate 140. The front side plate 110 and the rear side plate 120 are arranged opposite each other in the front-rear direction, and the top side plate 130 and the bottom side plate 140 are arranged opposite each other in the vertical direction. The top and bottom ends of the front side plate 110 are connected to the top side plate 130 and the bottom side plate 140, respectively, and the top and bottom ends of the rear side plate 120 are connected to the top side plate 130 and the bottom side plate 140, respectively. Corresponding to the position of the first moisturizing device 400, at least two crossbeams 150 are connected between the front side plate 110 and the rear side plate 120. The first moisturizing device 400 is locked and fixed to the two crossbeams 150 on opposite sides along the first direction X by fasteners.

[0053] For details, please refer to Figure 3 and Figure 6 The first moisturizing device 400 includes a first moisturizing disc 410, a first moisturizing cavity 413 formed in the first moisturizing disc 410, and the first moisturizing disc 410 includes a disc body 411 and a flange 412 formed on the top edge of the disc body 411. The opposite flanges 412 along the first direction X respectively overlap two crossbeams 150 and are locked together by fasteners. The disc body 411 is located between the two crossbeams 150. This arrangement ensures that the structure of the crossbeams 150 does not interfere with the structure of the disc body 411, and allows the disc body 411 to hold enough liquid to immerse the nozzle assembly 310.

[0054] In other embodiments of this application, the first moisturizing device 400 can also be installed on the frame 100 by a snap-fit ​​mechanism. For example, the first moisturizing device 400 may have a first snap-fit ​​portion, and the frame 100 may have a second snap-fit ​​portion. The first snap-fit ​​portion and the second snap-fit ​​portion snap together, thereby enabling the first moisturizing device 400 to be installed on the frame 100, and facilitating easy assembly and disassembly. Furthermore, in other embodiments, the first moisturizing device 400 can also be installed by a pin mechanism.

[0055] In some embodiments, please refer to Figure 2 and Figure 5The frame 100 has a first space 101, in which a first moisturizing device 400 and a protective plate 160 are sequentially arranged. The protective plate 160 and the first moisturizing device 400 divide the first space 101 from top to bottom into a first cavity 1011, a second cavity 1012 and a third cavity 1013 arranged sequentially. The first cavity 1011 is used to accommodate the printing carriage 300, the third cavity 1013 is used to install the circuit assembly 600, and the second cavity 1012 provides maintenance space for the printing carriage 300 when the first moisturizing device 400 is removed. The protective plate 160 protects the circuit assembly 600 in the third cavity 1013. Furthermore, since the circuit assembly 600 is installed in the third cavity 1013, which is relatively far away from the printing carriage 300, and the second cavity 1012 does not have the circuit assembly 600 installed, the first moisturizing device 400 can be removed from the second cavity 1012 when the printing carriage 300 needs maintenance, making it convenient for staff to start maintenance of the printing carriage 300 from the second cavity 1012.

[0056] Optionally, the circuit assembly 600 may include a computer host and other electronic components, wherein the computer host is the control center of the digital inkjet printing equipment.

[0057] In some embodiments, please refer to Figure 5 The protective plate 160 is connected to the inner walls of the frame 100 at its opposite ends along the second direction Y; the protective plate 160 is flush with the opposite sides of the first moisturizing device 400 along the first direction X on its opposite sides; or, the protective plate 160 extends outward relative to the opposite sides of the first moisturizing device 400 along the first direction X on its opposite sides. This arrangement allows the protective plate 160 to provide all-around protection for the circuit assembly 600 installed in the third cavity 1013, preventing liquid from the first moisturizing device 400 and the printing carriage 300 from dripping onto the circuit assembly 600 and corroding it.

[0058] Optionally, the first direction X is the left-right direction of the frame 100, the second direction Y is the front-back direction of the frame 100, the first cavity 1011, the second cavity 1012 and the third cavity 1013 are distributed in sequence along the vertical direction, the printing carriage 300, the first moisturizing device 400, the protective plate 160 and the circuit assembly 600 are distributed in sequence along the vertical direction, and the second cavity 1012 is located between the first moisturizing device 400 and the protective plate 160.

[0059] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 5The digital inkjet printing equipment also includes an electrical control cabinet 700, which is installed on the inner wall of the frame 100. In this embodiment, by installing the electrical control cabinet 700 on the inner wall of the frame 100, the electrical control cabinet 700 does not occupy the space of the second cavity 1012, thereby providing the second cavity 1012 for the staff to perform maintenance on the printhead assembly 310.

[0060] In some embodiments, please refer to Figure 5 The electrical control cabinet 700 has a first dimension along the first direction X, a second dimension along the second direction Y, and a third dimension along the vertical direction. The electrical control cabinet 700 is installed on one side of the inner wall of the frame 100 along the second direction Y, for example, on the rear inner wall of the frame 100. The first dimension of the electrical control cabinet 700 is larger than the third dimension, and the third dimension is larger than the second dimension. This arrangement minimizes the volume occupied by the electrical control cabinet 700 in the second cavity 1012 along the second direction Y, thereby reducing the impact of the electrical control cabinet 700 on the maintenance of the printing carriage 300.

[0061] In some embodiments, please refer to Figure 5 In the vertical direction, the orthographic projection of the electrical control cabinet 700 is located outside the orthographic projection of the printing carriage 300. That is, the electrical control cabinet 700 and the printing carriage 300 do not overlap in the vertical direction, so that the setting of the electrical control cabinet 700 will not affect the maintenance of the printing carriage 300.

[0062] For details, please refer to Figure 5 A guide rail 800 is installed on the rear inner wall of the frame 100. The printing carriage 300 is slidably mounted on the guide rail 800. The electrical control cabinet 700 is installed below the guide rail 800, and the front side of the guide rail 800 protrudes from the front side of the electrical control cabinet 700, so that the printing carriage 300 is located in the space outside the electrical control cabinet 700.

[0063] In some embodiments, please refer to Figure 2 The frame 100 also has a second space 102 and a third space 103. The first space 101, the second space 102, and the third space 103 are distributed sequentially along the first direction X. The printing platform 200 is located in the second space 102, and the second humidification device 500 is located in the third space 103. The printing carriage 300 is slidably disposed in the first space 101, the second space 102, and the third space 103 sequentially along the first direction X.

[0064] Please combine Figure 2 and Figure 7The first space 101 has a first opening on one side along the first direction X, the first opening being directly opposite the first humidification device 400, and a first maintenance door 170 is installed at the first opening. When maintenance of the printing carriage 300 is required, or when liquid needs to be added to the first humidification device 400, the first maintenance door 170 can be opened.

[0065] Please combine Figure 2 and Figure 7 The third space 103 has a second opening on the front side, and a second maintenance door 180 is installed at the second opening. The second humidification device 500 can be maintained by opening the second maintenance door 180.

[0066] Please combine Figure 2 and Figure 7 The second space 102 has a third opening on the front side facing the printing platform 200. A third maintenance door 190 is installed at the third opening to facilitate the staff to lay the printing media on the printing platform 200 or to remove the printed media after printing.

[0067] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A digital inkjet printing apparatus characterized by comprising: The application relates to a digital inkjet printing device. The digital inkjet printing device comprises a printing trolley and a print head assembly; A first moisturizing device is provided with a first moisturizing cavity which is open and used to contain liquid for the print head assembly to soak in the liquid; A second moisturizing device is provided with a second moisturizing cavity which is used to abut against a print head bottom plate of the printing trolley to form a closed cavity containing the print head assembly; A driving member is used to drive the print head assembly to descend or drive the first moisturizing device to ascend so that the print head assembly can soak in the liquid; the driving member is also used to drive the print head assembly to descend or drive the second moisturizing device to ascend so that the print head assembly can be contained in the closed cavity.

2. The apparatus of claim 1, wherein, The driving member is arranged on the printing trolley and drives the print head assembly to descend by a first preset distance so that the print head assembly can soak in the liquid; the driving member also drives the print head assembly to descend by a second preset distance so that the print head assembly can be contained in the closed cavity.

3. The apparatus of claim 1, wherein, The digital inkjet printing device further comprises a printing platform, and the printing trolley is arranged above the printing platform and slides in a first direction; The first moisturizing device and the second moisturizing device are respectively arranged outside opposite ends of the printing platform along the first direction.

4. The digital jet printing apparatus according to any one of claims 1 to 3, wherein The digital inkjet printing device further comprises a rack, and the printing trolley is arranged to slide on the rack; the first moisturizing device is detachably mounted on the rack.

5. The apparatus of claim 4, wherein the controller is further configured to: The first moisturizing device is mounted on the rack by locking or clamping through fasteners.

6. The apparatus of claim 4, wherein the controller is further configured to: The first moisturizing device comprises a first moisturizing disc which comprises a disc body and a flange formed on a top side edge of the disc body; the flange is overlapped on a cross beam of the rack and locked through fasteners.

7. The apparatus of claim 4, wherein the controller is further configured to: The rack is provided with a first space which is sequentially provided with the first moisturizing device and a protection plate; the protection plate and the first moisturizing device divide the first space into a first cavity, a second cavity and a third cavity from top to bottom; the first cavity is used to contain the printing trolley; the third cavity is used to mount a circuit assembly; and the second cavity provides a maintenance space for the printing trolley when the first moisturizing device is removed.

8. The apparatus of claim 7, wherein the controller is further configured to: The protection plate is connected with opposite inner walls of the rack along a second direction; The protection plate is flush with opposite sides of the first moisturizing device along a first direction; or the protection plate protrudes outward relative to the opposite sides of the first moisturizing device along the first direction. The digital inkjet printing device further comprises an electrical control cabinet which is mounted on an inner side wall of the rack.

9. The apparatus of claim 7, wherein the controller is further configured to: In a vertical direction, the projection of the electrical control cabinet is located outside the projection of the printing trolley.

10. The apparatus of claim 9, wherein the controller is further configured to: ​

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