A moisturizing cleaning device and method for a digital printing machine nozzle

Abstract

The application discloses a kind of digital printing machine nozzle's moisturizing cleaning device and method, comprising: water receiving tank, cleaning tank, the scraper that can be driven to rotate upwards is installed in the cleaning tank, the scraper is displaced with cleaning tank sliding;Moisturizing disc, the moisturizing disc is set in water receiving tank, and the upper end of the moisturizing disc is provided with opening and is distributed with sealing ring around opening.In water receiving tank, moisturizing disc and cleaning tank are integrally arranged for moisturizing and cleaning nozzle, to drive the scraper on cleaning tank displacement to carry out automatic scraping and cleaning to nozzle, when it is necessary to moisturize nozzle, moisturizing disc can be driven to rise and is inverted to moisturize nozzle, to realize the integration design of nozzle moisturizing and cleaning, and reduce the occupation of equipment space, and the design structure of moisturizing disc and cleaning tank is reasonable, while improving nozzle automation moisturizing and cleaning, its moisturizing and cleaning cooperation synergy is better, to make digital printing machine more stable and efficient operation.

Description

Technical Field

[0001] This invention relates to the field of digital printing equipment technology, and in particular to a moisturizing and cleaning device and method for the printhead of a digital printing machine. Background Technology

[0002] Digital printing is a digital printing technology that uses printheads to directly spray ink onto the surface of materials to form patterns. In practical use, the printhead needs to be kept clear and clean to ensure the accuracy, consistency, and quality of ink droplet ejection. However, when the printhead is idle for extended periods or operates intermittently, residual ink can easily dry and condense, causing printhead blockage. This can affect normal inkjet printing and even lead to permanent damage to the printhead. Therefore, proper cleaning and moisturizing maintenance can significantly extend the lifespan of the printhead and reduce its replacement frequency and maintenance costs.

[0003] In existing digital printing machines, the moisturizing and cleaning devices are mostly independent, requiring separate installation on either side of the printhead carriage. This results in a complex overall structure and a large footprint, hindering miniaturization and compact design. Furthermore, having two independent moisturizing and cleaning devices necessitates the use of more parts, increasing operating costs and maintenance complexity. The need for separate coordination and control of these two independent devices further complicates the control system, increasing the likelihood of operational inconsistencies, affecting operational continuity, and reducing production efficiency.

[0004] To address the problems existing in the prior art, this invention proposes to integrate the moisturizing device and the cleaning device, and uniformly set them on one side of the moving crossbeam of the printhead carriage. This leads to the objective of this invention: to provide a more compact, easier-to-maintain, and more efficient moisturizing and cleaning device for digital printing machine printheads. By integrating moisturizing and cleaning functions into a single design, the device reduces space occupation, simplifies the structure, and improves the automation and response speed of printhead maintenance, thereby enhancing the overall operating efficiency and stability of the equipment. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a moisturizing and cleaning device and method for the printhead of a digital printing machine.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A moisturizing and cleaning device for a digital printing machine printhead includes: a water receiving tank with an open upper end and a guide shaft installed inside the water receiving tank; a cleaning tank slidably connected to the guide shaft via a cleaning frame, and a scraper that can be driven to rotate upwards is installed inside the cleaning tank, the scraper sliding and moving with the cleaning tank; and a moisturizing tray, which is raised and lowered above the water receiving tank, the cleaning tank being positioned above the moisturizing tray and capable of being driven to slide away from the moisturizing tray, the moisturizing tray having an opening at its upper end and sealing rings distributed around the opening.

[0008] Preferably, a base plate is fixedly installed on the water receiving tank, and the moisturizing tray is slidably connected to the base plate via guide columns, and the moisturizing tray is driven and can move upward relative to the base plate.

[0009] Preferably, the moisturizing tray is provided with a short sensing plate and a long sensing plate, and the base plate is equipped with sensors corresponding to the short sensing plate and the long sensing plate, respectively.

[0010] Preferably, the cleaning box is fixedly installed on the cleaning frame, and the cleaning box is provided with a rotating frame that is driven to rotate. The scrapers are spaced apart on the rotating frame and arranged in two rows, with the two rows of scrapers arranged opposite each other on both sides of the rotating frame.

[0011] Preferably, the water receiving tank is provided with a mounting bracket and a baffle that are distributed in opposite directions. A drive belt is installed on the mounting bracket and the baffle. The drive belt is arranged parallel to the guide shaft. The cleaning rack is provided with a slide seat that is slidably inserted into the guide shaft and a drive fixing plate that is fixed to the drive belt.

[0012] Preferably, the mounting bracket is equipped with a driven drive shaft, the baffle is rotatably mounted with a pulley, and the drive belt is connected to the drive shaft and the pulley.

[0013] Preferably, a passive shaft is rotatably mounted on the mounting bracket and is disposed opposite to the drive shaft. The passive shaft is connected to the drive shaft via a synchronous belt, and the passive shaft and the drive shaft are respectively connected to the drive belt via corresponding pulleys.

[0014] Preferably, the baffle is fixed with a mounting cover for the pulley, and the mounting cover is tensioned with screws to install the pulley.

[0015] Preferably, detection switches are provided on both sides of the cleaning rack along the length of the guide shaft.

[0016] This invention also discloses a moisturizing cleaning method for the printhead of a digital printing machine, comprising:

[0017] S1. When the printhead of the digital printing machine needs to be cleaned, the scraper, which is set downwards in the cleaning box, rotates upwards.

[0018] S2. The scraper moves with the cleaning tank and scrapes away the residual ink on the print head;

[0019] S3. Once the nozzle cleaning is complete, move the cleaning tank away from the humidification tray.

[0020] S4. The scraper rotates downwards and pours clean water into the cleaning tank to clean the scraper;

[0021] S5. The moisturizing disc is driven upward and covers the nozzle, using the evaporation of water in the moisturizing disc to moisturize the nozzle.

[0022] The beneficial effects of this invention are:

[0023] The water tank integrates a moisturizing tray and a cleaning box for hydrating and cleaning the printheads. The cleaning box moves the scraper on it to automatically scrape and clean the printheads. When the printheads need moisturizing, the cleaning box moves away from the moisturizing tray to avoid it, allowing the moisturizing tray to rise and invert to moisturize the printheads. This achieves an integrated design for printhead moisturizing and cleaning, reducing the space occupied by the equipment. The design structure of the moisturizing tray and cleaning box is reasonable, improving the automation of printhead moisturizing and cleaning while ensuring good coordination between moisturizing and cleaning, so that the digital printing machine can operate more stably and efficiently. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a partial structural diagram of the present invention;

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0027] Figure 4 This is a schematic diagram of the cleaning tank of the present invention;

[0028] Figure 5 This is a partial structural schematic diagram of the cleaning tank of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the moisturizing tray of the present invention;

[0030] Figure 7 for Figure 6 Enlarged diagram of point B in the middle.

[0031] In the diagram: Water tank 1, horizontal plate 11, side plate 12, guide shaft 121, connecting seat 122, mounting bracket 13, baffle 14, cleaning tank 2, scraper 21, rotating frame 211, driven gear 212, cleaning frame 22, slide 221, transmission fixing plate 222, rotation drive component 23, active gear 231, transition gear 232, transmission drive component 24, transmission shaft 241, driven shaft 242, synchronous belt 243, idler pulley 244, transmission belt 25, pulley 251, mounting cover 252, screw 253, detection switch 26, switch bracket 261, moisturizing plate 3, sealing ring 31, base plate 32, guide seat 321, guide column 33, lifting drive component 34, screw jack 341, screw 342, sensor 35, mounting plate 351, short sensor plate 36, long sensor plate 37. Detailed Implementation

[0032] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0033] In the description of this invention, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Example 1:

[0036] like Figures 1 to 7 As shown, this embodiment discloses a moisturizing and cleaning device for the printhead of a digital printing machine, including: a water receiving tank 1, a cleaning tank 2, and a moisturizing tray 3. The upper end of the water receiving tank 1 is open. The printhead carriage of the digital printing machine moves on the crossbeam to spray ink. When the printhead carriage stops working, the printhead carriage can move above the water receiving tank 1. At this time, the printhead on the printhead carriage corresponds vertically to the upper opening of the water receiving tank 1.

[0037] The water receiving tank 1 has side plates 12 arranged opposite to each other on both sides. The side plates 12 are equipped with connecting seats 122 that are fixedly connected to the crossbeam, so that the water receiving tank 1 is fixed to the crossbeam through the connecting seats 122.

[0038] The water receiving tank 1 is equipped with a guide shaft 121, which is installed on the side plates 12 on both sides. The cleaning tank 2 is slidably connected to the guide shaft 121 via the cleaning frame 22, and the cleaning tank 2 is fixedly installed on the cleaning frame 22.

[0039] The water receiving tank 1 is provided with a mounting bracket 13 and a baffle 14 that are distributed opposite to each other. The baffle 14 and the mounting bracket 13 are distributed front and back on the water receiving tank 1. The mounting bracket 13 and the baffle 14 are equipped with two drive belts 25 that are distributed opposite to each other on both sides of the cleaning rack 22. The drive belts 25 are arranged parallel to the guide shaft 121.

[0040] The cleaning rack 22 is provided with a slide block 221 that is slidably inserted into the guide shaft 121 and a transmission fixing plate 222 that is fixed to the transmission belt 25. The transmission belt 25 is fixed to the cleaning rack 22 via the transmission fixing plate 222. The cleaning rack 22 slides back and forth along the length direction of the guide shaft 121 via the slide block 221. The cleaning rack 22 is fixedly connected to the transmission belt 25 via the transmission fixing plate 222, and thus the cleaning box 2 on the cleaning rack 22 can be driven to move back and forth via the transmission belt 25.

[0041] The mounting bracket 13 is equipped with a driven transmission shaft 241 and a drive component 24 connected to the transmission shaft 241. The drive component 24 can be a motor. The drive end of the drive component 24 is connected to the transmission shaft 241 to drive the transmission shaft 241 to rotate.

[0042] A pulley 251 is rotatably mounted on the baffle 14. The transmission belt 25 is connected to the transmission shaft 241 and the pulley 251. The transmission belt 25 is tensioned to the transmission shaft 241 and the pulley 251. Specifically, a mounting cover 252 covering the pulley 251 is fixed on the baffle 14. The mounting cover 252 is tensioned to the pulley 251 by screws 253. That is, the screws 253 on the mounting cover 252 adjust the position of the pulley 251 to tension the transmission belt 25.

[0043] A passive shaft 242, which is opposite to the drive shaft 241, is rotatably mounted on the mounting bracket 13. The passive shaft 242 is connected to the drive shaft 241 via a synchronous belt 243. An idler pulley 244 is mounted on the mounting bracket 13 to press and tension the synchronous belt 243, thereby driving the drive shaft 241 and the passive shaft 242 to rotate synchronously through the idler pulley 244 and the synchronous belt 243.

[0044] The passive shaft 242 and the drive shaft 241 are respectively connected to the drive belt 25 via corresponding pulleys 251. That is, in this embodiment, the drive shaft 241 and its corresponding pulley 251 cooperate to drive the drive belt 25 on one side, and the passive shaft 242 and its corresponding pulley 251 cooperate to drive the drive belt 25 on the other side, thereby driving the cleaning rack 22 and the cleaning box 2 to move through the drive belts 25 on both sides.

[0045] The cleaning tank 2 is equipped with a scraper 21 that can be driven to rotate and face upward. The scraper 21 slides and moves with the cleaning tank 2, and then the scraper 21 moves with the cleaning tank 2 and scrapes the nozzle. Specifically, the cleaning tank 2 is provided with a rotating frame 211 that can be driven to rotate and a scraper 21 that is provided on the rotating frame 211 and faces upward. There are multiple scrapers 21 and they are distributed corresponding to the nozzle.

[0046] One end of the rotating frame 211 is fixed with a passive tooth 212, and an active tooth 231 capable of being driven to rotate is meshed on the passive tooth 212. The active tooth 231 is rotatably mounted on the cleaning frame 22. The cleaning frame 22 is equipped with a rotating drive member 23 that is driven to rotate the active tooth 231. The rotating drive member 23 includes a rotary cylinder, and the drive end of the rotary cylinder is connected to the active tooth 231 so as to drive the active tooth 231 to rotate in both directions through the rotating drive member 23.

[0047] Furthermore, a transition tooth 232 is rotatably mounted on the cleaning rack 22. The active tooth 231 is driven to mesh with the passive tooth 212 through the transition tooth 232, so as to increase the rotational inertia by using multiple gears to cooperate with each other, so that the scraper 21 can rotate more stably and smoothly, thereby avoiding ink splashing caused by the rotation of the scraper 21.

[0048] The active tooth 231 drives the scraper 21 to rotate downward and extend into the cleaning tank 2 via the passive tooth 212 and the rotating frame 211. A spray head is provided above the cleaning tank 2 to deliver clean water to the scraper 21.

[0049] After the scraper 21 scrapes the nozzle, it can rotate downwards and extend into the cleaning tank 2. The scraper 21 is then cleaned by the water spray head, allowing the scraper 21 to scrape the nozzle repeatedly. This ensures the cleaning effect of the scraper 21 while avoiding frequent manual cleaning of the scraper 21, making nozzle cleaning simpler, more efficient, and reducing the cleaning cost of the nozzle.

[0050] The scrapers 21 are spaced apart on the rotating frame 211 and arranged in two rows. The two rows of scrapers 21 are arranged opposite each other on both sides of the rotating frame 211. By using the two rows of distributed scrapers 21, the cleaning box 2 can be moved once, and the two rows of scrapers 21 can be used to perform two scraping and cleaning, which greatly improves the cleaning effect and efficiency of the nozzle.

[0051] Detection switches 26 are arranged on both sides of the cleaning frame 22 along the length of the guide shaft 121. A switch bracket 261 for fixing the detection switches 26 is installed on the side plate 12 of the water receiving tank 1. When the cleaning frame 22 moves and is detected by one of the detection switches 26, the scraper 21 is driven to rotate upward. At this time, the scraper 21 can move with the cleaning tank 2 and scrape the cleaning nozzle until the cleaning frame 22 moves to be detected by the other detection switch 26. The cleaning tank 2 stops moving and the scraper 21 is driven to rotate downward. Clean water is delivered through the spray head to clean the scraper 21. The cleaned scraper 21 can then be used to scrape and clean the nozzle repeatedly.

[0052] The moisturizing tray 3 is raised and lowered on the water receiving tank 1. The cleaning tank 2 is located above the moisturizing tray 3 and can be driven to slide away from the moisturizing tray 3 to avoid the cleaning tank 2 interfering with the raising and lowering action of the moisturizing tray 3. A base plate 32 is fixedly installed on the water receiving tank 1. Specifically, a horizontal plate 11 is fixed on the water receiving tank 1, and the base plate 32 is fixed to the water receiving tank 1 via the horizontal plate 11.

[0053] The moisturizing tray 3 is slidably connected to the base plate 32 via the guide post 33. Specifically, the base plate 32 is provided with guide seats 321 that correspond one-to-one with the guide post 33. The guide post 33 is vertically inserted into the guide seat 321 so that the moisturizing tray 3 can move vertically up and down.

[0054] The moisturizing tray 3 is driven and can move upward relative to the base plate 32. Specifically, the base plate 32 is equipped with a lifting drive component 34 and a screw jack 341 connected to the driving end of the lifting drive component 34. The screw jack 342 of the screw jack 341 abuts against the lower end of the moisturizing tray 3. The lifting drive component 34 includes a motor, and the screw jack 341 is driven to the transmission shaft of the motor. Thus, the lifting drive component 34 drives the screw jack 341 to move the screw jack 342 up and down, and the screw jack 342 abuts against the moisturizing tray 3 to drive the moisturizing tray 3 to move upward. When the screw jack 342 moves downward, the moisturizing tray 3 slides downward under the action of gravity.

[0055] The upper end of the moisturizing tray 3 is provided with an opening and sealing rings 31 are distributed around the opening. The sealing rings 31 extend circumferentially along the port of the opening. By placing clean water in the moisturizing tray 3 and driving the moisturizing tray 3 to move upward and invert onto the nozzle, the clean water in the moisturizing tray 3 evaporates to moisturize and maintain the nozzle.

[0056] Furthermore, the moisturizing tray 3 is provided with a short sensing plate 36 and a long sensing plate 37. The short sensing plate 36 and the long sensing plate 37 extend downward and are fixed on the moisturizing tray 3. The base plate 32 is equipped with sensors 35 that correspond to the short sensing plate 36 and the long sensing plate 37 respectively. Specifically, the base plate 32 is equipped with a mounting plate 351 that corresponds to the position of the short sensing plate 36 and the long sensing plate 37. The two sensors 35 are respectively fixed on the mounting plate 351.

[0057] Furthermore, during the process of the moisturizing disc 3 being driven to rise and invert onto the nozzle, both the short sensing plate 36 and the long sensing plate 37 are sensed by their corresponding sensors 35. When the sealing ring 31 of the moisturizing disc 3 is about to invert onto the nozzle, the short sensing plate 35 disconnects from its corresponding sensor 35, thereby slowing down the rising speed of the moisturizing disc 3. This allows the sealing ring 31 to gradually deform and tightly fit around the outer periphery of the nozzle, ensuring the sealing and moisturizing effect of the moisturizing disc 3 on the nozzle. As the moisturizing disc 3 rises further, the long sensing plate 37 disconnects from its corresponding sensor 35, and the moisturizing disc 3 stops rising and remains inverted onto the nozzle, thus achieving automatic moisturizing of the nozzle and greatly improving the moisturizing efficiency of the nozzle.

[0058] This embodiment integrates a moisturizing tray 3 and a cleaning tank 2 for moisturizing and cleaning the nozzles on the water receiving tank 1. The cleaning tank 2 drives the scraper 21 on it to move and automatically scrape and clean the nozzles. When the nozzles need to be moisturized, the cleaning tank 2 moves away from the moisturizing tray 3 to avoid it, so that the moisturizing tray 3 can be driven to rise and invert to moisturize the nozzles. This realizes the integrated design of nozzle moisturizing and cleaning, reduces the space occupied by the equipment, and is more conducive to the miniaturization of the equipment.

[0059] Furthermore, the design structure of the moisturizing tray 3 and the cleaning box 2 is reasonable. While improving the automatic moisturizing and cleaning of the printhead, the coordination between moisturizing and cleaning is good, so that the digital printing machine can operate more stably and efficiently.

[0060] This embodiment also discloses a moisturizing cleaning method for the printhead of a digital printing machine, including:

[0061] S1. When it is necessary to clean the printhead of the digital printing machine, the scraper 21, which is set downward in the cleaning box 2, is rotated upward.

[0062] S2, the scraper 21 moves with the cleaning tank 2 and scrapes off the residual ink on the print head;

[0063] S3. After the nozzle cleaning is complete, move the cleaning tank 2 away from the moisturizing tray 3.

[0064] S4. The scraper 21 rotates downward and conveys clean water into the cleaning tank 2 to clean the scraper 21;

[0065] S5. The moisturizing disc 3 is driven to move upward and cover the nozzle, and the nozzle is moisturized by the evaporation of water in the moisturizing disc 3.

[0066] Example 2:

[0067] The difference between this embodiment and embodiment 1 lies in the installation method of the water tank 1. In this embodiment, the water tank 1 is installed on the robotic arm so that the robotic arm can move the water tank 1 and bring it close to the nozzle for moisturizing and cleaning operations.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A moisturizing cleaning device for a digital printing machine nozzle, characterized in that, include: Water receiving tank (1), the upper end of the water receiving tank (1) is open, and a guide shaft (121) is installed inside the water receiving tank (1). A cleaning box (2) is slidably connected to a guide shaft (121) via a cleaning frame (22). A scraper (21) capable of being driven to rotate upward is installed inside the cleaning box (2). The scraper (21) slides and moves with the cleaning box (2). The moisturizing tray (3) is raised and lowered on the water receiving tank (1). The cleaning tank (2) is located above the moisturizing tray (3) and can be driven to slide away from the moisturizing tray (3). The upper end of the moisturizing tray (3) is provided with an opening and sealing rings (31) are distributed around the opening.

2. The moisture-cleaning device of a digital printing machine nozzle according to claim 1, characterized in that, A base plate (32) is fixedly installed on the water receiving tank (1). The moisturizing tray (3) is slidably connected to the base plate (32) via a guide column (33). The moisturizing tray (3) is driven and can move upward relative to the base plate (32).

3. The moisture-cleaning device of a digital printing machine nozzle according to claim 2, characterized in that, The moisturizing tray (3) is provided with a short sensor plate (36) and a long sensor plate (37), and the base plate (32) is provided with sensors (35) corresponding to the short sensor plate (36) and the long sensor plate (37).

4. The moisture-cleaning device for a digital printing machine nozzle according to claim 1, wherein The cleaning box (2) is fixedly installed on the cleaning frame (22). The cleaning box (2) is provided with a rotating frame (211) that is driven to rotate. The scrapers (21) are spaced apart on the rotating frame (211) and arranged in two rows. The two rows of scrapers (21) are arranged opposite to each other on both sides of the rotating frame (211).

5. The moisture-cleaning device of the digital printing machine nozzle according to claim 1, characterized in that, The water receiving tank (1) is provided with a mounting bracket (13) and a baffle (14) that are relatively distributed. A drive belt (25) driven by the drive belt (25) is installed on the mounting bracket (13) and the baffle (14). The drive belt (25) is arranged parallel to the guide shaft (121). The cleaning rack (22) is provided with a slide (221) that is slidably inserted into the guide shaft (121) and a drive fixing plate (222) that is fixed to the drive belt (25).

6. The moisture-cleaning device of a digital printing machine nozzle according to claim 5, characterized in that, The mounting bracket (13) is equipped with a driven rotating transmission shaft (241), and the baffle (14) is rotatably mounted with a pulley (251). The transmission belt (25) is connected to the transmission shaft (241) and the pulley (251).

7. The moisture-cleaning device of a digital printing machine nozzle according to claim 6, characterized in that, A passive shaft (242) is rotatably mounted on the mounting bracket (13) and is disposed opposite to the drive shaft (241). The passive shaft (242) is connected to the drive shaft (241) via a synchronous belt (243). The passive shaft (242) and the drive shaft (241) are respectively connected to the drive belt (25) via corresponding pulleys (251).

8. The moisture-cleaning device of the digital printing machine nozzle according to claim 6, characterized in that, The baffle (14) is fixed with a mounting cover (252) covering the pulley (251), and the mounting cover (252) is tensioned to the pulley (251) by screws (253).

9. The moisturizing and cleaning device for a digital printing machine printhead as described in claim 1, characterized in that, Detection switches (26) are provided on both sides of the cleaning rack (22) along the length of the guide shaft (121).

10. A method for moisturizing and cleaning the printhead of a digital printing machine, characterized in that, include: S1. When it is necessary to clean the printhead of the digital printing machine, the scraper (21) placed downward in the cleaning box (2) is rotated upward; S2, The scraper (21) moves with the cleaning box (2) and scrapes the ink residue on the print head; S3, when the cleaning of the spray head is completed, the cleaning tank (2) is moved away from the moisturizing disc (3); S4, the scraper (21) is rotated downward and water is delivered into the cleaning tank (2) to clean the scraper (21); S5, the moisturizing disc (3) is driven to displace upward and cover the spray head, and the spray head is moisturized by the evaporation of water in the moisturizing disc (3).

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