Maintenance mechanism of elliptical digital printing machine

Abstract

This application relates to the field of digital printing machine technology, specifically a maintenance mechanism for an elliptical digital printing machine. The mechanism includes a frame, a print head assembly mounted on the frame, and a cleaning and moisturizing assembly. The cleaning and moisturizing assembly includes a moisturizing tray and a cleaning tray. The moisturizing tray is mounted on a moisturizing support plate, and its bottom has an inlet and an outlet. A scraper seat is installed at the open end of the cleaning tray, and both ends of the scraper seat are fixedly connected to the cleaning tray via scraper seat fixing plates. A waste liquid pipe is sealed to the bottom of the cleaning tray. The lifting mechanism at the bottom of the cleaning and moisturizing assembly includes a moisturizing cylinder seat. The moisturizing tray is connected to a floating connector at the output end of a corresponding moisturizing cylinder via a moisturizing tray fixing plate, and the cleaning tray is also connected to the floating connector at the output end of a corresponding moisturizing cylinder via a cleaning tray fixing plate. A fixed support structure is provided between the moisturizing cylinder seat and the frame. This application features a compact overall structure, convenient operation, and strong adaptability, effectively extending the service life of the print head and reducing equipment maintenance costs.

Description

Technical Field

[0001] This application relates to the field of digital printing machine technology, and in particular to a maintenance mechanism for an oval digital printing machine. Background Technology

[0002] With the rapid development of digital printing technology, oval digital printing machines, with their advantages of high printing efficiency, wide material compatibility, and high printing precision, are widely used in various industries such as textiles, advertising, and packaging. The print head assembly of an oval digital printing machine, as a core working component, directly determines the quality of the printed products. However, the nozzles of the print head are susceptible to factors such as ink residue, dust adhesion, and moisture loss, leading to problems such as nozzle clogging, uneven ink output, and blurry printing. These issues severely affect printing quality and production efficiency, and may even shorten the lifespan of the print head, increasing equipment maintenance costs. Chinese patent CN207523238U discloses an elliptical digital printer, including a frame and a conveyor mounted on the frame for transporting the material to be printed. The elliptical digital printer also includes a first digital printing body mounted on the frame for spraying base ink onto the material and a second digital printing body for spraying color ink onto the material. The first and second digital printing bodies have the same structure. The first digital printing body includes an inkjet carriage with a printhead and a maintenance mechanism for maintaining the printhead. This utility model provides an elliptical digital printer that solves the technical problem of print quality being affected by printhead clogging by separately setting up a first digital printing body and a second digital printing body, both of which are equipped with maintenance mechanisms.

[0003] In existing technologies, the maintenance mechanisms on oval digital printers specifically moisturize and clean the printheads through a moisturizing section and a cleaning section. Both aim to prevent ink drying and thus avoid printhead clogging that could affect printing quality. However, current oval digital printer maintenance devices on the market are prone to shaking during the cleaning or moisturizing process, leading to misalignment with the printhead. This not only affects the maintenance effect but may also cause collision damage to the printhead. Furthermore, the waste ink discharge path after cleaning is poorly designed, easily resulting in ink leakage, contaminating the internal environment of the equipment, and increasing the difficulty of subsequent cleaning. These problems severely restrict the user experience and production efficiency of oval digital printers. Therefore, developing a compact, thorough, stable, easy-to-operate, and highly adaptable maintenance mechanism for oval digital printers has become an urgent technical problem to be solved in this field. Utility Model Content

[0004] In order to overcome the problems existing in the prior art, this application provides a maintenance mechanism for an oval digital printing machine.

[0005] The maintenance mechanism for an oval digital printing machine provided in this application adopts the following technical solution: A maintenance mechanism for an elliptical digital printing machine includes a frame, a head assembly mounted on the frame, and a cleaning and moisturizing assembly located below the head assembly and fixed to the frame. The cleaning and moisturizing assembly is used to clean and moisturize the head of the head assembly, and includes a moisturizing tray and a cleaning tray. The moisturizing tray is mounted on a moisturizing support plate, and has an inlet and an outlet at its bottom. A scraper seat is installed at the open end of the cleaning tray, and the two ends of the scraper seat are fixedly connected to the cleaning tray through scraper seat fixing plates. A waste liquid pipe is sealed to the bottom of the cleaning tray. The bottom of the cleaning and moisturizing assembly is provided with a lifting mechanism for driving its stable lifting and lowering. The lifting mechanism includes a moisturizing cylinder seat, on which several sets of moisturizing cylinders are evenly installed along its length. The moisturizing tray is connected to the output end floating connector of the corresponding moisturizing cylinder through a moisturizing tray fixing plate, and the cleaning tray is connected to the output end floating connector of the corresponding moisturizing cylinder through a cleaning tray fixing plate. A fixed support structure is provided between the moisturizing cylinder seat and the frame.

[0006] Furthermore, several sets of guide shafts are vertically installed at the bottom of both the moisturizing tray fixing plate and the cleaning tray fixing plate. These guide shafts slide in conjunction with the moisturizing cylinder seat and the cleaning tray guide plate, respectively, to limit the lifting and lowering displacement of the moisturizing tray fixing plate and the cleaning tray fixing plate. The moisturizing cylinder seat is horizontally arranged along the length of the moisturizing tray. The bottom of the cleaning tray guide plate is fixed to the moisturizing cylinder seat with bolts. The bottom of the moisturizing cylinder seat is fixedly installed on the cleaning and moisturizing bracket, which is detachably installed on the frame using fasteners. The moisturizing tray includes a tank body and a mounting plate annularly surrounding the tank body. The mounting plate is fixedly connected to the moisturizing support plate with bolts. A ring of moisturizing tray sealing strips is fitted to the top surface of the mounting plate. These sealing strips are used to seal against the bottom of the machine head assembly, preventing the moisturizing liquid from evaporating or leaking. The bottom of the tank body has a conical structure, low in the center and high around the edges. The liquid outlet is located at the center of the bottom of the tank body, and the liquid inlet is located on the side wall of the tank body, with its height higher than the liquid outlet. Both the liquid inlet and outlet are connected to an external moisturizing liquid circulation mechanism to realize the circulation supply and discharge of the moisturizing liquid.

[0007] Furthermore, the scraper holder is horizontally arranged along the length of the cleaning disc, and the opening ends of the cleaning disc on both sides of the scraper holder are provided with inclined guide surfaces that slope inwards into the tank; the waste liquid pipe at the bottom of the cleaning disc is sealed and connected to the waste ink tank; several scrapers are arrayed along the length of the scraper holder, and the scrapers are detachably installed on the scraper holder by bolts or snap-fit ​​structures, and the top surface of the scrapers is adapted to fit the nozzle surface of the print head. On the side of the frame away from the printing end, there are mutually isolated moisturizing and maintenance sections, which are separated by an L-shaped partition plate; the moisturizing section is provided with a moisturizing disc sheet metal, and the moisturizing disc sheet metal has an opening adapted to the cleaning and moisturizing components, the upper part of the cleaning and moisturizing components extends through the opening to the bottom of the print head components; the waste ink tank is detachably installed in the maintenance section, and the end of the waste liquid pipe away from the cleaning disc passes through the L-shaped partition plate and is sealed and connected to the waste ink tank, and the waste liquid pipe is provided with a shut-off valve for controlling the discharge of waste ink.

[0008] In summary, this application includes at least one of the following beneficial technical effects: 1. This application sets up a lifting mechanism consisting of several sets of moisturizing cylinders, floating joints and fixed support structures, and is equipped with a sliding fit structure between the guide shaft and the corresponding guide plate. This effectively avoids the shaking problem of the cleaning disc and moisturizing disc during the lifting process, greatly improves the alignment accuracy with the machine head, ensures the cleaning and moisturizing maintenance effect, and prevents collision damage to the machine head caused by alignment deviation. 2. The bottom of the cleaning tray in this application is sealed to the waste liquid pipe, and the waste liquid pipe passes through the L-shaped isolation plate and is sealed to the waste ink tank in the maintenance department. With the setting of the shut-off valve, the waste ink discharge path is optimized, the problem of waste ink leakage is completely solved, the pollution of the internal environment of the equipment is avoided, and the difficulty of subsequent cleaning is reduced. 3. The moisturizing tray in this application adopts a conical groove structure and is designed to connect the liquid inlet and outlet with the external moisturizing liquid circulation mechanism, so as to realize the circulation supply and discharge of moisturizing liquid. Combined with the ring-shaped distributed sealing strip of the moisturizing tray, it can effectively prevent the moisturizing liquid from evaporating or leaking, and improve the moisturizing stability. 4. The detachable scraper on the scraper seat of this application fits and adapts to the nozzle surface of the machine head, and the guide slope at the opening end of the cleaning disc enables scraping and cleaning of the machine head. The overall structure is compact, easy to operate and highly adaptable, which can significantly improve the user experience of the oval digital printing machine, increase production efficiency, extend the service life of the machine head and reduce equipment maintenance costs. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the cleaning and moisturizing components in the maintenance mechanism of an oval digital printing machine; Figure 2 yes Figure 1 A schematic diagram of the bottom side structure; Figure 3This is a schematic diagram of the overall structure of the maintenance mechanism of an oval digital printing machine.

[0010] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Humidification section; 111. Sheet metal for humidification tray; 12. Inspection section; 13. L-shaped isolation plate; 2. Cleaning and humidification assembly; 21. Cleaning and humidification bracket; 3. Humidification tray; 31. Humidification support plate; 32. Liquid inlet; 33. Liquid outlet; 34. Humidification tray fixing plate; 35. Tank; 351. Mounting plate; 352. Humidification tray sealing strip; 4. Cleaning tray; 41. Scraper seat; 411. Scraper; 42. Scraper seat fixing plate; 43. Waste liquid pipe; 431. Waste ink bucket; 432. Shut-off valve; 44. Cleaning tray fixing plate; 45. Guide slope; 5. Lifting mechanism; 51. Humidification cylinder seat; 511. Cleaning tray guide plate; 52. Humidification cylinder; 53. Floating joint; 54. Guide shaft. Detailed Implementation

[0011] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0012] This application discloses a maintenance mechanism for an oval digital printing machine.

[0013] Reference Figure 1 , Figure 2 and Figure 3A maintenance mechanism for an elliptical digital printing machine includes a frame 1, a head assembly mounted on the frame 1, and a cleaning and moisturizing assembly 2 located below the head assembly and fixed to the frame 1. The cleaning and moisturizing assembly 2 is used to clean and moisturize the head of the head assembly, and includes a moisturizing tray 3 and a cleaning tray 4. The moisturizing tray 3 is mounted on a moisturizing support plate 31, and its bottom has an inlet 32 ​​and an outlet 33. A scraper seat 41 is installed at the open end of the cleaning tray 4, and both ends of the scraper seat 41 are fixedly connected to the cleaning tray 4 via scraper seat fixing plates 42. The bottom of the washing plate 4 is sealed with a waste liquid pipe 43; the bottom of the cleaning and moisturizing component 2 is provided with a lifting mechanism 5 for driving its stable lifting and lowering. The lifting mechanism 5 includes a moisturizing cylinder seat 51, on which several sets of moisturizing cylinders 52 are evenly installed along its length. The moisturizing plate 3 is connected to the output end floating connector 53 of the corresponding moisturizing cylinder 52 through the moisturizing plate fixing plate 34. The washing plate 4 is connected to the output end floating connector 53 of the corresponding moisturizing cylinder 52 through the washing plate fixing plate 44. A fixed support structure is provided between the moisturizing cylinder seat 51 and the frame 1. During operation, the lifting mechanism 5 drives the cleaning and moisturizing component 2 to lift and lower. Specifically, several sets of moisturizing cylinders 52, evenly arranged along the length of the moisturizing cylinder seat 51, operate. Through the floating connector 53 at the output end, the moisturizing plate fixing plate 34 connected to the moisturizing plate 3 and the cleaning plate fixing plate 44 connected to the cleaning plate 4 can be raised or lowered respectively. The fixed support structure between the moisturizing cylinder seat 51 and the frame 1 can ensure the overall stability of the lifting mechanism 5. When the machine head needs to be cleaned, the cleaning plate 4 rises to the corresponding position with the drive, and the moving machine head cooperates with the scraper seat 41 to complete the cleaning action. The waste liquid generated during cleaning is discharged through the waste liquid pipe 43 at the bottom of the cleaning plate 4. When the machine head needs to be moisturized, the moisturizing plate 3 rises to the corresponding position with the drive, and the external moisturizing liquid enters through the liquid inlet 32 ​​at the bottom of the moisturizing plate 3. The used liquid is discharged through the liquid outlet 33, thereby circulating the moisturizing liquid and completing the cleaning or moisturizing operation of the machine head.

[0014] Reference Figure 1 , Figure 2 and Figure 3The bottom of both the moisturizing tray fixing plate 34 and the cleaning tray fixing plate 44 are vertically mounted with several sets of guide shafts 54. The guide shafts 54 are slidably engaged with the moisturizing cylinder seat 51 and the cleaning tray guide plate 511, respectively, to limit the lifting and lowering displacement of the moisturizing tray fixing plate 34 and the cleaning tray fixing plate 44. The moisturizing cylinder seat 51 is horizontally arranged along the length of the moisturizing tray 3. The bottom of the cleaning tray guide plate 511 is fixed to the moisturizing cylinder seat 51 with bolts. The bottom of the moisturizing cylinder seat 51 is fixedly mounted on the cleaning and moisturizing bracket 21. The cleaning and moisturizing bracket 21 is detachably mounted on the frame 1 with fasteners. The moisturizing tray 3 includes a tank 35 and a mounting plate 351 that surrounds the tank 35. The mounting plate 351 is fixedly connected to the moisturizing support plate 31 with bolts. The top surface of the mounting plate 351 is fitted with a ring of moisturizing tray sealing strips 352. The moisturizing tray sealing strips 352 are used to fit and seal with the bottom of the machine head assembly to prevent the moisturizing liquid from evaporating or leaking. The bottom of the tank 35 has a conical structure with a low center and high sides. The liquid outlet 33 is located at the center of the bottom of the tank 35, and the liquid inlet 32 ​​is located on the side wall of the tank 35 and its height is higher than that of the liquid outlet 33. Both the liquid inlet 32 ​​and the liquid outlet 33 are connected to the external moisturizing liquid circulation mechanism to realize the circulation supply and discharge of moisturizing liquid. During the lifting process of the lifting mechanism 5 driving the moisturizing tray fixing plate 34 and the cleaning tray fixing plate 44 to rise and fall, several sets of guide shafts 54 vertically installed at the bottom of the two will slide with the moisturizing cylinder seat 51 and the cleaning tray guide plate 511 respectively, thereby effectively limiting the lifting and falling offset of the moisturizing tray fixing plate 34 and the cleaning tray fixing plate 44, and further ensuring the alignment accuracy of the moisturizing tray 3 and the cleaning tray 4 with the machine head; when the moisturizing tray 3 is working, the external moisturizing liquid circulation mechanism inputs the moisturizing liquid into the tank 35 through the liquid inlet 32 ​​on the side wall of the tank 35. Since the bottom of the tank 35 is a conical structure with a low center and high perimeter, the moisturizing liquid can evenly cover the inside of the tank 35. At the same time, the annular moisturizing tray sealing strip 352 on the top surface of the mounting plate 351 is in close contact with the bottom of the machine head assembly to prevent the moisturizing liquid from evaporating or leaking. The moisturizing liquid in the tank 35 will flow back to the external moisturizing liquid circulation mechanism through the liquid outlet 33 at the bottom center, realizing the circulation supply and discharge of the moisturizing liquid, and continuously providing a stable moisturizing environment for the machine head.

[0015] Reference Figure 1 , Figure 2 and Figure 3The scraper seat 41 is horizontally arranged along the length of the cleaning disc 4. The opening ends of the cleaning disc 4 on both sides of the scraper seat 41 are provided with guide slopes 45 that are inclined towards the groove. The waste liquid pipe 43 at the bottom of the cleaning disc 4 is sealed and connected to the waste ink tank 431. Several scraper blades 411 are arranged in an array along the length of the scraper seat 41. The scraper blades 411 are detachably installed on the scraper seat 41 by bolts or snap-fit ​​structure, and the top surface of the scraper blades 411 is adapted to fit the nozzle surface of the machine head. The frame 1 has a moisturizing section 11 and a maintenance section 12 that are isolated from each other on the side away from the printing end. The moisturizing section 11 and the maintenance section 12 are separated by an L-shaped partition plate 13. The moisturizing section 11 has a moisturizing plate sheet metal 111 with an opening adapted to the cleaning and moisturizing component 2. The upper part of the cleaning and moisturizing component 2 extends through the opening to the bottom of the head assembly. The waste ink tank 431 is detachably installed in the maintenance section 12. The end of the waste liquid pipe 43 away from the cleaning plate 4 passes through the L-shaped partition plate 13 and is sealed to the waste ink tank 431. The waste liquid pipe 43 is equipped with a shut-off valve 432 for controlling the discharge of waste ink. When cleaning the printer head, the cleaning disc 4 rises to the scraper 411 on the scraper holder 41, which fits and adheres to the nozzle surface of the printer head. The scraper 411 scrapes away ink residue and dust from the nozzle surface as the printer head moves. The resulting waste ink flows into the cleaning disc 4 through the guide slope 45 at the opening of the cleaning disc 4 on both sides of the scraper holder 41. Then, the shut-off valve 432 on the waste liquid pipe 43 is opened, and the waste ink passes through the waste liquid pipe 43 sealed at the bottom of the cleaning disc 4, through the L-shaped isolation plate 13, and into the waste ink tank 431 in the maintenance section 12, thus achieving... Waste ink is collected in a sealed manner; the moisturizing part 11 of the frame 1, which is away from the printing end, is isolated from the maintenance part 12. The upper part of the cleaning and moisturizing component 2 extends through the opening on the sheet metal 111 of the moisturizing plate of the moisturizing part 11 to the bottom of the head assembly. This can ensure that maintenance work can be carried out smoothly while avoiding contamination of the printing end by waste ink. Moreover, the staff can enter the maintenance part 12 to move the waste ink bucket 431 and perform maintenance and repair on the head. The scraper 411 is detachably installed on the scraper seat 41 by bolts or snap-fit ​​structure, which is convenient for replacement and maintenance as needed.

[0016] Working Principle: When the maintenance mechanism of this elliptical digital printing machine is working, the lifting mechanism 5 first drives the cleaning and moisturizing component 2 to rise. Specifically, several sets of moisturizing cylinders 52 on the moisturizing cylinder seat 51 move synchronously, driving the moisturizing plate fixing plate 34 and the cleaning plate fixing plate 44 to rise respectively through the floating joint 53. During the process, the guide shafts 54 at the bottom of the moisturizing plate fixing plate 34 and the cleaning plate fixing plate 44 slide and cooperate with the moisturizing cylinder seat 51 and the cleaning plate guide plate 511 respectively, limiting the lifting and lowering offset and ensuring that the cleaning plate 4 and the moisturizing plate 3 are accurately aligned with the machine head assembly. When the machine head needs to be cleaned, the cleaning plate 4 rises to be in contact with the nozzle surface of the machine head. The machine head is moved, and the scraper 411 on the scraper seat 41 is adapted to fit against the nozzle surface to scrape off ink residue and dust. The waste generated during cleaning is removed. Ink flows into the tank through the guide slope 45 at the open end of the cleaning disc 4, and then through the waste liquid pipe 43 connected to the bottom seal. After being controlled by the shut-off valve 432, it passes through the L-shaped isolation plate 13 and enters the waste ink tank 431 in the maintenance section 12. When the printer head needs to be moisturized, the moisturizing disc 3 rises to fit against the bottom of the printer head assembly. The ring-shaped sealing strips 352 of the moisturizing disc achieve a seal. The external moisturizing liquid circulation mechanism supplies moisturizing liquid into the conical tank 35 through the liquid inlet 32 ​​on the side wall of the moisturizing disc 3. The moisturizing liquid in the tank flows back to the external moisturizing liquid circulation mechanism through the liquid outlet 33 at the bottom center, realizing the circulation supply and discharge of moisturizing liquid and preventing the moisturizing liquid from evaporating or leaking. After maintenance is completed, the moisturizing cylinder 52 drives the cleaning and moisturizing component 2 to descend and reset, completing one maintenance operation.

[0017] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A maintenance mechanism for an oval digital printing machine, characterized in that: It includes a frame (1), a head assembly mounted on the frame (1), and a cleaning and moisturizing assembly (2) located below the head assembly and fixed on the frame (1); the cleaning and moisturizing assembly (2) is used to clean and moisturize the head of the head assembly, and includes a moisturizing tray (3) and a cleaning tray (4). The moisturizing tray (3) is installed on the moisturizing support plate (31), and the bottom of the moisturizing tray (3) is provided with an inlet (32) and an outlet (33). The cleaning tray (4) has a scraper seat (41) installed at the open end. The two ends of the scraper seat (41) are fixedly connected to the cleaning tray (4) through the scraper seat fixing plate (42). The bottom of the cleaning tray (4) is sealed with a waste liquid pipe (43). The bottom of the cleaning and moisturizing component (2) is provided with a lifting mechanism (5) for driving its stable lifting and lowering. The lifting mechanism (5) includes a moisturizing cylinder seat (51). Several sets of moisturizing cylinders (52) are evenly installed on the moisturizing cylinder seat (51) along its length direction. The moisturizing plate (3) is connected to the output end floating connector (53) of the corresponding moisturizing cylinder (52) through the moisturizing plate fixing plate (34). The cleaning plate (4) is connected to the output end floating connector (53) of the corresponding moisturizing cylinder (52) through the cleaning plate fixing plate (44). A fixed support structure is provided between the moisturizing cylinder seat (51) and the frame (1).

2. The maintenance mechanism for an oval digital printing machine according to claim 1, characterized in that: The bottom of the moisturizing tray fixing plate (34) and the cleaning tray fixing plate (44) are vertically mounted with several sets of guide shafts (54). The guide shafts (54) are slidably engaged with the moisturizing cylinder seat (51) and the cleaning tray guide plate (511) respectively to limit the lifting and lowering offset of the moisturizing tray fixing plate (34) and the cleaning tray fixing plate (44). The moisturizing cylinder seat (51) is horizontally arranged along the length direction of the moisturizing tray (3). The bottom of the cleaning tray guide plate (511) is fixed to the moisturizing cylinder seat (51) by bolts. The bottom of the moisturizing cylinder seat (51) is fixedly installed on the cleaning and moisturizing bracket (21). The cleaning and moisturizing bracket (21) is detachably installed on the frame (1) by fasteners.

3. The maintenance mechanism for an oval digital printing machine according to claim 2, characterized in that: The moisturizing tray (3) includes a tank (35) and an mounting plate (351) that surrounds the tank (35) in an annular shape. The mounting plate (351) is fixedly connected to the moisturizing support plate (31) by bolts. The top surface of the mounting plate (351) is fitted with an annularly distributed moisturizing tray sealing strip (352). The moisturizing tray sealing strip (352) is used to fit and seal with the bottom of the machine head assembly to prevent the moisturizing liquid from evaporating or leaking.

4. The maintenance mechanism for an oval digital printing machine according to claim 3, characterized in that: The bottom of the tank (35) is a conical structure with a low center and high sides. The liquid outlet (33) is located at the center of the bottom of the tank (35), and the liquid inlet (32) is located on the side wall of the tank (35) and its height is higher than that of the liquid outlet (33). The liquid inlet (32) and the liquid outlet (33) are both connected to the external moisturizing liquid circulation mechanism to realize the circulation supply and discharge of moisturizing liquid.

5. The maintenance mechanism for an oval digital printing machine according to claim 1, characterized in that: The scraper seat (41) is horizontally arranged along the length of the cleaning disc (4). The opening ends of the cleaning disc (4) on both sides of the scraper seat (41) are provided with guide slopes (45) that are inclined towards the groove. The waste liquid pipe (43) at the bottom of the cleaning disc (4) is sealed and connected to the waste ink bucket (431). Several scraper blades (411) are arranged in an array along the length of the scraper seat (41). The scraper blades (411) are detachably installed on the scraper seat (41) by bolts or snap-fit ​​structure, and the top surface of the scraper blades (411) is adapted to fit the nozzle surface of the machine head.

6. The maintenance mechanism for an oval digital printing machine according to claim 5, characterized in that: The frame (1) has a moisturizing part (11) and a maintenance part (12) that are isolated from each other on the side away from the printing end. The moisturizing part (11) and the maintenance part (12) are separated by an L-shaped partition plate (13). The moisturizing part (11) has a moisturizing plate sheet metal (111). The moisturizing plate sheet metal (111) has an opening that is adapted to the cleaning and moisturizing component (2). The upper part of the cleaning and moisturizing component (2) extends through the opening to the bottom of the head assembly. The waste ink tank (431) is detachably installed in the maintenance part (12). The end of the waste liquid pipe (43) away from the cleaning plate (4) passes through the L-shaped partition plate (13) and is sealed to the waste ink tank (431). The waste liquid pipe (43) is provided with a shut-off valve (432) for controlling the discharge of waste ink.

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