Air suction platform and digital printing equipment

Abstract

The utility model is suitable for the field of digital printing, and provides an air suction platform and digital printing equipment. The air suction platform comprises a platform body internally provided with an air suction cavity, the upper surface of the platform body is provided with a plurality of air suction holes communicating with the air suction cavity, and the interior of the air suction cavity is divided into at least two air suction areas; the air pipe is internally provided with at least two air ducts, the at least two air ducts are in one-to-one correspondence with the at least two air suction areas and are communicated with the at least two air suction areas, the air pipe is provided with first air ports in one-to-one correspondence with the at least two air ducts, and the first air ports are used for inputting negative pressure; the baffles are arranged on the air pipe and correspond to the at least two first air openings in a one-to-one mode, and the baffles close or open the first air openings; and the air door driving assembly comprises at least two driving wheels and can synchronously drive the at least two baffles to move so as to control the air suction areas to be opened one by one until all the air suction areas are opened and close the air suction areas one by one until all the air suction areas are closed after the medium leaves. The adsorption capacity to the medium can be improved, and the phenomenon that ink is absorbed on the spray head, so that ink dripping points are influenced, and the printing effect is influenced can be avoided.

Description

Technical Field

[0001] The utility model belongs to the field of digital printing, and particularly relates to a suction platform and a digital printing device. Background Art

[0002] During the printing process of a digital printing device, a suction platform is used to convey or carry a printing substrate (hereinafter referred to as a printing medium or a medium). The existing suction platform forms a negative pressure area on the surface of the suction platform in the form of negative pressure to adsorb the printing medium to prevent the printing medium from slipping or shifting, which affects the printing effect. The structure of this suction platform has at least the following defects:

[0003] (1) The effective adsorption area of the suction platform is fully open. During the transportation of the printing medium, the air flow will concentrate on the adsorption area not covered by the printing medium, which makes the air flow formed at the position covered by the bottom of the printing medium extremely weak or no adsorption air flow is formed, resulting in a very weak adsorption force of the suction platform on the printing medium or even losing the adsorption ability, and the printing medium is prone to slipping and displacement phenomena;

[0004] (2) Based on point (1), when the print head descends to a preset height and sprays ink on the printing medium, the strong suction force generated in the suction area not covered by the printing medium will cause ink suction on the print head during printing, thereby affecting the landing point of the ink droplets and resulting in poor printing effects. Summary of the Utility Model

[0005] The suction platform provided by the utility model aims to solve the problems that the poor adsorption effect of the existing suction platform easily causes adsorption failure phenomenon and the ink suction phenomenon on the print head affects the landing point of the ink droplets.

[0006] The utility model is realized as follows. A suction platform includes:

[0007] A platform main body, which is internally provided with a suction cavity, and a plurality of suction holes communicating with the suction cavity are provided on the upper surface. The suction cavity is divided into at least two suction areas, and at least two of the suction areas are arranged flat along the medium conveying direction;

[0008] An air duct is arranged outside the platform main body. At least two air channels are provided in the air duct. At least two of the air channels correspond to and communicate with at least two of the suction areas. The air duct is provided with first air outlets corresponding to at least two of the air channels, and the first air outlets are used for inputting negative pressure;

[0009] At least two baffles are arranged on the air duct and correspond to at least two of the first air outlets one by one. The baffles close or open the corresponding first air outlets to close or open the corresponding suction areas;

[0010] The air door driving assembly is provided on the platform body and includes at least two driving wheels that correspond to at least two of the baffles one by one and are rotatably provided on the platform body. At least two of the driving wheels can synchronously drive at least two of the baffles to move to control the suction areas to be opened one by one along the moving direction of the medium until all are opened, and close the suction areas one by one until all are closed after the medium leaves.

[0011] Further, the air door driving assembly further includes at least two driving rods. At least two of the driving rods are movably provided on the platform body and correspond to at least two of the driving wheels and at least two of the baffles one by one. A first arc track and a second arc track that are connected end to end are provided in the rotation direction of each driving wheel. The curvature of the first arc track is smaller than that of the second arc track. One end of the driving rod can move between the first arc track and the second arc track, and the other end is connected to the baffle. When the driving rod moves in the first arc track, the baffle closes the first air port. When the driving rod moves in the second arc track, the baffle opens the first air port;

[0012] At a preset position, the driving rod corresponding to the first driving wheel in a preset direction is placed in the second arc track, and the driving rods corresponding to the remaining driving wheels are placed in the first arc track and are arranged away from the end point of the first arc track in sequence in the moving direction of the driving rod. The first air ports of at least two of the suction areas in the moving direction of the medium correspond to at least two of the driving wheels in the preset direction;

[0013] When at least two of the driving wheels rotate synchronously, the driving rod corresponding to the first driving wheel enters the first arc track from the second arc track, and the driving rods corresponding to the remaining driving wheels enter the second arc track from the first arc track in sequence. At least two of the driving rods control at least two of the baffles to open at least two of the first air ports in sequence until all are opened and then close at least two of the first air ports in sequence until all are closed.

[0014] Further, the first arc track and the second arc track are combined into a gourd-shaped structure. The included angle between the midpoint connection line of the first arc track and the second arc track and the horizontal line is set as α. The included angle α on each driving wheel is set to adjust the preset position of the driving rod on the first arc track or the second arc track.

[0015] Further, it is characterized in that in the medium moving direction, let the included angle on the driving wheel corresponding to the first air suction area be α1, let the included angle on the driving wheel corresponding to the second air suction area be α2..., and let the included angle on the driving wheel corresponding to the nth air suction area be αn. Then, the angular differences Δα1, Δα2... Δαn of the included angles α between adjacent driving wheels are such that Δα1, Δα2... Δαn increase linearly.

[0016] Further, at least two of the driving wheels are coaxially arranged. The preset direction is the axial direction of the driving wheels, and the first arc-shaped track and the second arc-shaped track are arranged on the side surfaces of the driving wheels.

[0017] Optionally, the air door driving assembly further includes a first driving member and a transmission shaft arranged on the platform main body. At least two of the driving wheels are spaced apart and installed on the transmission shaft along the axial direction of the transmission shaft, and the first driving member drives the transmission shaft to rotate.

[0018] Optionally, at least two air expansion shafts are arranged at intervals along the axial direction of the transmission shaft. At least two air expansion shafts are configured one-to-one with at least two of the driving wheels, and the driving wheels are fixed on the transmission shaft through the air expansion shafts.

[0019] Optionally, the outer contour of the driving wheel is adapted to the shape formed by the first arc-shaped track and the second arc-shaped track.

[0020] Optionally, a roller is provided at one end of the driving rod that moves on the first arc-shaped track and the second arc-shaped track, and the roller can move on the first arc-shaped track and the second arc-shaped track.

[0021] Further, the platform main body further includes an adjusting assembly arranged in the air suction cavity for adjusting the width of the air suction area, wherein the width direction is perpendicular to the medium moving direction.

[0022] Further, a bidirectionally telescopic partition assembly is provided between two adjacent air suction areas in the air suction cavity. The adjusting assembly includes two moving plates, which are movably spaced apart in the air suction cavity along a direction perpendicular to the medium moving direction and are connected to the partition assembly. The communication between each air suction area and each air duct is located between the two moving plates. The moving plates can move along a direction perpendicular to the medium moving, and the peripheries of the moving plates are hermetically arranged with the cavity wall of the air suction cavity. The partition assembly and the moving plates enclose at least two air suction areas. When the two moving plates move away from or close to each other, the partition assembly extends or retracts.

[0023] Further, the adjusting assembly further includes a lead screw disposed in the air suction cavity and a second driving member disposed outside the platform body and driving the lead screw to rotate. The lead screw passes through the moving plate and is in threaded cooperation with the moving plate. The lead screw can drive the two moving plates to move away from or close to each other.

[0024] Further, the partition assembly includes a first partition and a second partition movably disposed in the air suction cavity in opposite directions, and an intermediate partition fixedly disposed in the air suction cavity and located between the first partition and the second partition. The first partition and the second partition are respectively connected to one of the moving plates. A sealing arrangement is provided in a bonded manner between the first partition and the intermediate partition, and between the second partition and the intermediate partition. When the two moving plates move away from or close to each other, the first partition and the second partition are driven to extend or retract.

[0025] Optionally, when the first partition and the second partition extend to the maximum stroke, the two moving plates respectively abut against the two side walls of the air suction cavity.

[0026] Optionally, there are at least two first partitions and at least two second partitions. The outermost first partition among the at least two first partitions is connected to one of the moving plates, and the outermost second partition among the at least two second partitions is connected to the other moving plate.

[0027] Optionally, a first limiting portion is provided on the side of the outermost first partition among the at least two first partitions facing the intermediate partition, and the first limiting portion is located at one end away from the moving plate connected thereto. On the side of the innermost first partition among the at least two first partitions facing away from the intermediate partition, second limiting portions are respectively provided at both ends in its moving direction, and a third limiting portion is provided at one end close to the moving plate connected to the first partition on the side facing the intermediate partition. Fourth limiting portions are respectively provided at both ends in the moving direction of the first partition on the opposite sides of the remaining first partitions.

[0028] A fifth limiting portion is provided on the side of the outermost second partition among the at least two second partitions facing the intermediate partition, and the fifth limiting portion is located at one end away from the moving plate connected thereto. On the side of the innermost second partition among the at least two second partitions facing away from the intermediate partition, sixth limiting portions are respectively provided at both ends in its moving direction, and a seventh limiting portion is provided at one end close to the moving plate connected to the second partition on the side facing the intermediate partition. Eighth limiting portions are respectively provided at both ends in the moving direction of the second partition on the adjacent sides of the remaining second partitions.

[0029] The limiting parts on the same side of two adjacent partition plates are collinear and staggered along the moving direction of the partition plates. When the first partition plate and the second partition plate move, the collinear limiting parts can be mutually contacted to pull or push the partition plates to extend or retract;

[0030] Optionally, the air suction cavity is provided with sliding grooves on both the bottom wall and the top wall between two adjacent air suction areas. The partition plate assembly is telescopically arranged in the sliding grooves and can be telescoped in the sliding grooves.

[0031] The present utility model further provides a digital printing device, including the aforementioned air suction platform.

[0032] The beneficial effects achieved by the present utility model are as follows: by dividing the air suction cavity in the platform main body into at least two air suction areas, so that the air suction holes on the platform main body form zoned air suction, and then arranging air ducts to communicate with the air suction cavity and making the air ducts of the air ducts correspond to at least two air suction areas one by one, so that each air suction area forms an independent air flow channel. At least two air suction areas are horizontally laid along the moving direction of the medium and a damper driving assembly is arranged to drive the baffle to move to open or close the air suction areas one by one along the moving direction of the medium. When the medium moves on the platform main body, it can be controlled that the air suction area where the medium is currently located is in the air suction state, while other air suction areas are in the closed state. After the medium leaves the current air suction area, the current air suction area is closed, and other air suction areas still remain in the air suction state, which can ensure that the air flow channel is only formed in the current air suction area covered by the medium. When the power of the negative pressure source is certain, it can improve the adsorption capacity of the air suction area covered by the medium currently, and can avoid that when the medium covers the current air suction area, the wind force in the current air suction area is transferred to other areas due to being covered by the medium, resulting in no adsorption force in the current area covered by the medium on the platform main body, causing the loss of the adsorption ability of the platform main body to the medium. Moreover, it can also avoid the adsorption force generated by other air suction areas not covered by the medium from sucking ink from the nozzle, thereby affecting the landing point of the ink droplets and resulting in affecting the printing effect. Description of the Drawings

[0033] Figure 1 is the external structure schematic diagram of an air suction platform provided by the present utility model;

[0034] Figure 2 is Figure 1 the sectional view at A-A in

[0035] Figure 3 is the state schematic diagram of an air suction platform provided by the present utility model when the nozzle is printing;

[0036] Figure 4 is the structural schematic diagram of the damper driving assembly of an air suction platform provided by the present utility model;

[0037] Figure 5It is a partial exploded view of an air suction platform provided by the present utility model;

[0038] Figure 6 It is another perspective structural schematic diagram of the air door driving assembly of an air suction platform provided by the present utility model;

[0039] Figure 7 It is a state diagram of the path change of the driving rod on the driving wheel during the working process of the air door driving assembly of an air suction platform provided by the present utility model;

[0040] Figure 8 is Figure 5 The enlarged view of part B in

[0041] Figure 9 It is a connection structural schematic diagram of the partition assembly and the moving plate of an air suction platform provided by the present utility model.

[0042] Explanation of the reference numerals in the drawings:

[0043] 1. Platform main body; 1a. Platform panel; 1b. Cavity; 11. Air suction cavity; 111. Air suction area; 112. Second air outlet; 113. Slide groove; 12. Air suction hole; 13. Vertical plate; 131. Fixed seat; 2. Air duct; 21. Air duct; 22. First air outlet; 23. Third air outlet; 3. Baffle; 4. Air door driving assembly; 41. Driving wheel; 411. First arc track; 412. Second arc track; 42. Driving rod; 421. Roller; 43. First driving member; 44. Transmission shaft; 45. Air inflation shaft; 5. Negative pressure cavity; 51. Fourth air outlet; 52. Fifth air outlet; 6. Adjusting assembly; 61. Moving plate; 62. Second seal; 63. Lead screw; 64. Mounting seat; 7. Partition assembly; 7. Partition assembly; 71. First partition; 711. First limiting part; 712. Second limiting part; 713. Third limiting part; 72. Second partition; 721. Fifth limiting part; 722. Sixth limiting part; 723. Seventh limiting part; 73. Intermediate partition; 731. First connecting part; 732. Second connecting part; 8. Slide rail; 10. Medium; 20. Sprinkler head. Detailed implementation manners

[0044] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0045] See Figures 1-4, an embodiment of the present utility model provides a suction platform for adsorbing a single moving medium 10, which includes a platform main body 1, an air duct 2, a baffle 3, and a damper drive assembly 4. Among them, an air suction cavity 11 is provided inside the platform main body 1, and a plurality of air suction holes 12 communicating with the air suction cavity 11 are provided on the upper surface. The air suction cavity 11 is divided into at least two air suction areas 111. The at least two air suction areas 111 are arranged flat along the conveying direction of the medium 10. The air duct 2 is arranged outside the platform main body 1. At least two air ducts 21 are provided inside the air duct 2. The at least two air ducts 21 correspond to and communicate with the at least two air suction areas 111 one by one. A first air outlet 22 corresponding to the at least two air ducts 21 one by one is provided on the air duct 2. The first air outlet 22 is used to input negative pressure. There are at least two baffles 3. The at least two baffles 3 are arranged on the air duct 2 and correspond to the at least two first air outlets 22 one by one. The baffle 3 is used to close or open the corresponding first air outlet 22 to close or open the corresponding air suction area 111. The damper drive assembly 4 is arranged on the platform main body 1 and includes at least two drive wheels 41 corresponding to the at least two baffles 3 one by one and rotatably arranged on the platform main body 1. The at least two drive wheels 41 can synchronously drive the at least two baffles 3 to control the air suction areas 111 to be opened one by one along the moving direction of the medium 10, and close the air suction areas 111 one by one after the medium 10 leaves.

[0046] By dividing the air suction cavity 11 in the platform main body 1 into at least two air suction areas 111, so that the air suction holes 12 on the platform main body 1 form zoned air suction. Then, an air duct 2 is arranged to communicate with the air suction cavity 11 and the air ducts 21 of the air duct 2 correspond to the at least two air suction areas 111 one by one, so that each air suction area 111 forms an independent air flow channel. The at least two air suction areas 111 are horizontally laid along the movement direction of the medium 10 and a damper drive assembly 4 is arranged to drive the baffle 3 to move to open or close the air suction areas 111 one by one along the moving direction of the medium 10. When the medium 10 moves on the platform main body 1, it can be controlled that the air suction area 111 where the medium 10 is currently located is in the air suction state, while the other air suction areas 111 are in the closed state. After the medium 10 leaves the current air suction area 111, the current air suction area 111 is closed, and the other air suction areas 111 still remain in the air suction state. It can ensure that an air flow channel is formed only in the current air suction area 111 covered by the medium 10. When the power of the negative pressure source is certain, the adsorption capacity of the air suction area 111 currently covered by the medium 10 can be improved. It can avoid that when the medium 10 covers the current air suction area 111, the wind force in the current air suction area 111 is transferred to other areas due to being covered by the medium 10, resulting in no adsorption force in the current area covered by the medium 10 on the platform main body 1, causing the loss of the ability of the platform main body 1 to adsorb the medium 10. And it can also avoid the adsorption force generated by the other air suction areas 111 not covered by the medium 10 from sucking ink from the nozzle 20 for printing operation when it drops to the preset height, thus affecting the landing point of the ink droplets and resulting in affecting the printing effect.

[0047] The air suction platform provided by the utility model can improve the adsorption capacity of the medium 10, avoid the loss of adsorption ability of the medium 10 during transportation, so as to avoid phenomena such as slipping and moving of the medium 10. In addition, it can also avoid the ink suction phenomenon on the nozzle, thereby affecting the ink drop point and the printing effect.

[0048] For better understanding, let the number of the air suction areas 111 be n, where n >= 2, that is, the number of the air ducts 21, the first air vents 22, and the baffles 3 are all n. The air damper driving assembly 4 is simultaneously connected to n baffles 3 and synchronously drives the n baffles 3 to move, so as to open n first air vents 22 one by one or close n first air vents 22 one by one. When the medium 10 moves towards the platform main body 1 and moves to the first air suction area 111, the air suction function of the first air suction area 111 is turned on, while other air suction areas 111 are in the closed state. Specifically, when the medium 10 moves onto the first air suction area 111, at least two driving wheels 41 synchronously control the movement of the baffle 3. The baffle 3 corresponding to the first air suction area 111 controls the first air vent 22 to be in the open state, and the baffles 3 corresponding to other air suction areas 111 control the corresponding first air vents 22 to be in the closed state. When the medium 10 moves on the platform main body 1 to the second air suction area 111, the baffle 3 corresponding to the second air suction area 111 opens the corresponding first air vent 22, and at the same time, the baffle 3 of the first air suction area 111 still remains in the state of opening the first air vent 22. When the medium 10 continues to move on the platform main body 1 to the next air suction area 111, the air suction area 111 adjacent to the opened air suction area 111 is correspondingly opened. And at the same time, if after the medium 10 leaves the first air suction area 111, the baffle 3 of the first air suction area 111 closes the corresponding first air vent 22, and so on until the medium 10 leaves the platform main body 1.

[0049] See Figure 5 , specifically, the platform main body 1 includes a cavity 1b and a platform cover plate 1a arranged above the cavity 1b. The air suction cavity 11 is arranged in the cavity 1b, and the air suction holes 12 are opened on the platform cover plate 1a. The air suction holes 12 on the platform cover plate 1a are communicated with the air suction cavity 11 in the cavity 1b.

[0050] See Figure 2 , specifically, at least two second air vents 112 are arranged in the air suction cavity 11. The at least two second air vents 112 correspond to at least two air suction areas 111 and at least two air ducts 21 one by one. The second air vents 112 communicate the air suction areas 111 and the air ducts 21, that is, one second air vent 112 corresponds to one air suction area 111 and one air duct 21 and communicates the corresponding air suction area 111 and air duct 21. In this way, an air flow path can be formed between the air suction area 111 and the corresponding air duct 21.

[0051] See Figure 1, in this embodiment, the air duct 21 can be arranged below the platform main body 1, that is, the air duct 21 and the platform main body 1 are stacked up and down. In this way, the structure of the air suction platform can be reasonably arranged, saving space occupation. Specifically, a third air outlet 23 corresponding to the first air outlet 22 can be opened on the upper surface of the air duct 21, and the first air outlet 22 and the fifth air outlet 52 can connect the air suction area 111 and the air duct 21.

[0052] See Figure 1 , further, vertical plates 13 are respectively arranged at both ends of the platform main body 1 along the moving direction of the vertical medium 10. Both ends of the platform cover plate 1a respectively extend towards the vertical plates 13 and are fixedly connected to the vertical plates 13. One end of the air duct 21 fixed at the bottom of the platform main body 1 and provided with the first air outlet 22 penetrates through one of the vertical plates 13 to further improve the supporting force of the air duct 21 when the following negative pressure cavity 5 is installed on the air duct 21.

[0053] See Figure 4 , further, the platform main body 1 further includes a negative pressure cavity 5. The negative pressure cavity 5 is spliced and arranged at one end of the air duct 21 where the first air outlet 22 is located and is communicated with at least two first air outlets 22. The negative pressure cavity 5 is used to connect to a negative pressure source. Specifically, a fifth air outlet 52 is arranged on the negative pressure cavity 5, and the fifth air outlet 52 is connected to the negative pressure source. By setting the negative pressure cavity 5 to be communicated with at least two first air outlets 22 and connecting a negative pressure source into the negative pressure cavity 5, a negative pressure can be formed in the negative pressure cavity 5 after the negative pressure source is turned on. When the first air outlet 22 communicated with the negative pressure cavity 5 is opened, an air flow path can be formed between the corresponding air duct 21 and the negative pressure cavity 5. In this way, the installation structure of the negative pressure source and at least two first air outlets 22 can be simplified, avoiding the complexity of the structure caused by using too many pipes connected and increasing the installation cost.

[0054] See Figure 4 、 Figure 6 , further, the negative pressure cavity 5 is provided with a fourth air outlet 51 corresponding to the first air outlet 22 one by one. The fourth air outlet 51 is arranged in a fitting manner with the corresponding air outlet. A baffle 3 is arranged on one side of the first air outlet 22 and can move towards the first air outlet 22. The driving rod 42 drives the baffle 3 to translate towards the first air outlet 22 and extend into the space between the first air outlet 22 and the fourth air outlet 51 to close the first air outlet 22. When the baffle 3 moves towards the first air outlet 22, the baffle 3 extends into the space between the first air outlet 22 and the fourth air outlet 51 to close the first air outlet 22. Specifically, a groove (not marked in the figure) for the baffle 3 to extend into is arranged on one side of the first air outlet 22 or the fourth air outlet 51 close to the baffle 3. In this way, when the baffle 3 extends from the groove to close the first air outlet 22, it can still ensure that the first air outlet 22 and the fourth air outlet 51 on the negative pressure cavity 5 are arranged in a fitting manner to avoid air leakage.

[0055] See Figure 4 and Figure 6, in this embodiment, the first air outlet 22 can be larger than the fourth air outlet 51, so that the air flow velocity in the direction from the air suction area 111 to the negative pressure cavity 5 can be increased when the air source is turned on. The baffle 3 can be adapted to the fourth air outlet 51, so as to reduce the material cost of the baffle 3.

[0056] See Figure 4 , Figure 7 , further, the air door driving assembly further includes at least two driving rods 42. The at least two driving rods 42 are movably arranged on the platform main body 1 and correspond to the at least two driving wheels 41 and the at least two baffles 3 one by one. Specifically, the at least two driving rods 42 are movably arranged on the vertical plate 13 of the platform main body 1. A first arc track 411 and a second arc track 412 are arranged end to end in the rotation direction of each driving wheel 41. The curvature of the first arc track 411 is smaller than that of the second arc track 412, that is, the first arc track 411 is farther from the rotation center of the driving wheel 41, while the second arc track is closer to the rotation center of the driving wheel 41. One end of the driving rod 42 can move between the first arc track 411 and the second arc track 412, and the other end is connected to the baffle 3. When the driving rod 42 moves in the first arc track 411, the driving rod 42 drives the baffle 3 to close the first air outlet 22. When the driving rod 42 moves in the second arc track 412, the driving rod 42 drives the baffle 3 to open the first air outlet 22; at the preset position, the driving rod 42 corresponding to the first driving wheel 41 in the preset direction is placed in the second arc track 412, and the driving rods 42 corresponding to the other driving wheels 41 are placed in the first arc track 411 and are arranged in sequence away from the end point of the first arc track 411 in the moving direction of the driving rod 42, that is, among the driving rods 42 on the other driving wheels 41 except the first driving wheel 2 in the preset direction, the time taken for the driving rods 42 to move to the end point of the first arc track 411 in their moving direction increases in sequence. The first air outlets 22 of at least two of the air suction areas 111 in the medium moving direction correspond to at least two of the driving wheels 41 in the preset direction. The moving direction of the said driving rod 42 is shown in Figure 7 , in order to Figure 7Taking the rotation direction of the middle drive wheel 41 as an example, when the drive wheel 41 rotates counterclockwise, the moving direction of the drive rod 42 is clockwise. When at least two drive wheels 41 rotate synchronously, the drive rod 42 corresponding to the first drive wheel 41 enters the first arc track 411 from the second arc track 412, and the drive rods 42 corresponding to the remaining drive wheels 41 enter the second arc track 412 from the first arc track 411 in sequence. At least two drive rods 42 control at least two baffles 3 to open at least two first air vents 22 in sequence until all are opened, and then close at least two first air vents 22 in sequence until all are closed. When the first air vent 22 corresponds to the corresponding air suction area 111, it can open the air suction area 111 one by one until all are opened, and then close them one by one until all are closed.

[0057] It should be noted that during operation, the air door drive assembly 4 can be activated when the medium moves to the set position of the first air suction area 111, so that at least two drive wheels 41 rotate synchronously, and at least two drive rods 42 control the synchronous movement of at least two baffles 3, thereby realizing the closing or opening of the corresponding first air vent 22.

[0058] See Figure 7 Specifically, the air suction areas 111 can be set to 2, 3, 4... n. Correspondingly, the air ducts 21, the first air vents 22, the baffles 3, the drive rods 42, and the drive wheels 41 can be set to 2, 3, 4... n, and can be set according to the specifications of the medium 10, the moving speed of the medium 10, and the actual requirements such as the size of the air suction area 111 of the platform main body 1. In this embodiment, the first arc track 411 and the second arc track 412 are spliced into a gourd-shaped structure. The included angle between the midpoint connection line (hereinafter referred to as "line a") of the first arc track 411 and the second arc track 412 on the drive wheel 41 and the horizontal line is set as α. The included angle α on each drive wheel 41 is set to adjust the preset position of the drive rod 42 on the first arc track 411 or the second arc track 412. Specifically, the air suction areas 111 can be set to 2, 3, 4... n according to the actual application scenario requirements. Correspondingly, the baffles 4, the drive rods 3, and the drive wheels 2 can be set to 2, 3, 4... n, and can be set according to the specifications of the medium 100, the moving speed of the medium 100, and the actual requirements such as the size of the air suction area of the platform main body 10. Then, the same number of drive wheels 41 as the number of air suction areas 111 are set, and the included angle α on each drive wheel 41 is set, so as to control at least two air suction areas 111 to be opened one by one in sequence until all are opened, and then closed one by one in sequence until all are closed.

[0059] Continue to see Figure 7, Further, in the moving direction of the medium 10, the angle between the line a on the driving wheel 41 corresponding to the first air suction area 111 and the horizontal line is α1, the angle between the line a on the driving wheel 41 corresponding to the second air suction area 111 and the horizontal line is α2... the angle between the line a on the driving wheel 41 corresponding to the nth air suction area 111 and the horizontal line is αn. Then, the included angles α between two adjacent driving wheels 41 are Δα1, Δα2,... Δαn, and Δα1, Δα2, Δα3... Δαn increase linearly. Wherein, α1, α2... αn and Δα1, Δα2,... Δαn are determined according to the number of the set air suction areas 111, so as to generate a stroke difference when the driving rods 42 on at least two driving wheels 41 are in the preset positions. After setting the preset angle, the rotation speed of the driving wheel 41 is determined by the moving speed of the medium 10. In this way, when at least two driving wheels 41 rotate synchronously, it can be ensured that the corresponding baffles 3 in the air suction areas 111 are controlled to open one by one until all are opened and then closed one by one until all are closed.

[0060] See Figure 7 , For better understanding, in this embodiment, the air suction area 111 is set to 3 as an example. Correspondingly, there are also 3 driving wheels 41, driving rods 42, baffles 3, air ducts 21, and first air outlets 22, which respectively correspond to the first air suction area 111, the second air suction area 111, and the third air suction area 111 in the moving direction of the medium 10 from left to right. In the initial state, the angle between the line a on the left driving wheel 41 and the horizontal line is set to -10° at the preset position, the angle between the line a on the middle driving wheel 41 and the horizontal line is set to -70° at the preset position, and the angle between the line a on the right driving wheel 41 and the horizontal line is set to -160° at the preset position. Then, Δα1 = 60°, Δα2 = 90°, and Δα1 is greater than Δα2 and increases linearly to ensure that the first air outlets 22 of the three air suction areas 111 corresponding to the three driving wheels 41 are all in the closed state in the initial state. During operation, the three driving wheels 41 rotate synchronously in the counterclockwise direction (in practice, the driving wheels 41 can also be set to rotate synchronously in the clockwise direction. When changing the rotation direction of the driving wheels 41, the angles between the line a on the left, middle, and right driving wheels 41 and the horizontal line change accordingly). The motion state changes of the driving rods 42 on the three driving wheels 41 on the first arc track 411 and the second arc track 412 of the corresponding driving wheels 41 are as Figure 7As shown in the figure, the states change successively from state 1 to state 2, state 3, state 4, state 5, and state 6. In state 1, the medium 10 has not moved in front of the first air suction area 111, and all three driving wheels 41 are in the closed state; state 2 is the state when the medium 10 runs to the first air suction area 111. At this time, the first air suction area 111 is opened to adsorb the medium 10, and the second air suction area 111 and the third air suction area remain closed; state 3 changes from state 2. At this time, the medium 10 runs to the second air suction area 111, the first air suction area 111 remains open, the second air suction area 111 changes from closed to open, and the third air suction area 111 remains closed; state 4 changes from state 3. At this time, the medium 10 runs to the third air suction area 111 and still covers the first air suction area 111. The first air suction area 111 and the second air suction area 111 both remain open, and the third air suction area 111 changes from closed to open; state 5 changes from state 4. At this time, the rear end of the medium 10 leaves the first air suction area 111, the first air suction area 111 changes from open to closed, and the second air suction area 111 and the second air suction area 111 still remain open; state 6 changes from state 5. At this time, the rear end of the medium 10 leaves the second air suction area 111, the first air suction area 111 still remains closed, the second air suction area 111 changes from open to closed, and the third air suction area 111 still remains open; then state 6 changes to state 1. At this time, the rear end of the medium 10 leaves the third air suction area 111, the first and second air suction areas 111 still remain closed, and the third air suction area 111 changes from open to closed. At this time, all three air suction areas 111 are closed, and the adsorption process of one medium 10 is completed. Then it continues to enter the next cycle. The three air suction areas 111 change from state 6 to state 1 and continue to adsorb and convey the next medium 10.

[0061] It should be noted that the specific number of the air suction areas 111 can be set according to actual needs. Then, the curvatures of the first arc track 411 and the second arc track 412 on the driving wheel 41 and the angles of the line a on each driving wheel 41 can be set according to the number of the air suction areas 111. When the number of the air suction areas 111 is small, the difference between Δα1, Δα2, …… Δαn needs to be increased. When the number of the air suction areas 111 increases, the difference between Δα1, Δα2, …… Δαn becomes smaller. For example, in this embodiment, the number of the air suction areas 111 is 3, Δα1 is 60°, Δα2 is 90°, and the difference between Δα1 and Δα2 is 30°. If the number of the air suction areas 111 is 2, the difference between Δα1 and Δα2 needs to be set greater than 30°. If the number of the air suction areas 111 is greater than 3, the difference between Δα1 and Δα2 needs to be set less than 30°. In this way, it can be ensured that all the first air outlets 22 are in the closed state in state 1. Then, the rotation speed of the driving wheel 41 can be determined according to the moving speed of the medium 10. When the driving wheels 41 rotate synchronously, it can be ensured that they are opened in sequence until all are opened and then closed in sequence until all are closed.

[0062] See Figure 4 and Figure 6 , Further, at least two driving wheels 41 are coaxially arranged. The preset direction is the axial direction of the driving wheel 41. The first arc track 411 and the second arc track 412 are arranged on the side surface of the driving wheel 41. In this way, it is convenient for the reasonable layout of the structure of the driving wheel 41 and effectively saves the occupied space.

[0063] See Figures 4-6 , Further, the air door driving assembly 4 further includes a first driving member 43 and a transmission shaft 44. The first driving member 43 and the transmission shaft 44 are both arranged on the above-mentioned vertical plate 13. At least two driving wheels 41 are installed on the transmission shaft 44 at intervals along the axial direction of the transmission shaft 44. The first driving member 43 drives the transmission shaft 44 to rotate. In this way, one first driving member 43 can drive one transmission shaft 44 to drive at least two driving wheels 41 to rotate synchronously, so that the structure can be simplified, the control precision of at least two driving wheels 41 can be improved, and the cost can be reduced.

[0064] Further, at least two air shafts are provided on the transmission shaft 44 at intervals along its axial direction. At least two air shafts 45 are arranged in one-to-one correspondence with at least two driving wheels 41. The driving wheels 41 are fixed on the transmission shaft 44 through the air shafts 45. During installation, after adjusting the angle α between the line a on the driving wheel 41 and the horizontal line, the air shaft is inflated to make the convex part of its surface abut against the driving wheel 41, so that the driving wheel 41 is fixed on the transmission shaft 44. Using the air shaft 45 to fix the driving wheel 41 to the transmission shaft 44 can make the preset angle of the line a on each driving wheel 41 adjustable. Compared with the traditional non-adjustable (such as key structure) fixing method, this design can be compatible with the settings of different numbers of air suction areas 111, and has stronger adaptability.

[0065] See Figure 4 , specifically, the air door driving assembly 4 is arranged on the vertical plate 13 through which the air duct 21 passes. A fixing seat 131 is arranged on the vertical plate 13, and a guiding groove (not marked in the figure) for the driving rod 42 to pass through is arranged on the fixing seat 131. On the one hand, the guiding groove can support and fix the driving rod 42, and on the other hand, it can guide the driving rod 42 when it is driven by the driving wheel 41 to move.

[0066] See Figure 4 , further, a roller 421 is arranged at one end of the driving rod 42 moving on the first arc track 411 and the second arc track 412. The roller 421 can move on the first arc track 411 and the second arc track 412. In this way, the friction generated when the driving rod 42 moves on the first arc track 411 and the second arc track 412 can be reduced, thereby reducing the load of the following first driving member 43, which is beneficial to reducing the cost of the first driving member 43 and improving its service life.

[0067] See Figure 7 , further, the outer contour of the driving wheel 41 is adapted to the shape surrounded by the first arc track 411 and the second arc track 412. In this way, the volume of the driving wheel 41 can be reduced, avoiding excessive space occupation and realizing miniaturization of the structure.

[0068] In this embodiment, the first driving member 43 can be, but is not limited to, a motor.

[0069] See Figure 5 and Figure 8 , further, the platform main body 1 further includes an adjusting assembly 6 arranged in the air suction cavity 11 for adjusting the width of the air suction area 111, wherein the width direction is perpendicular to the moving direction of the medium 10. In this way, the width of the air suction area 111 can be adjusted according to the width of the medium 10 to adapt to the printing of media 10 of different sizes, thereby avoiding energy waste.

[0070] See Figure 8, Further, a bidirectionally telescopic partition assembly 7 is provided between two adjacent air suction areas 111 of the air suction cavity 11. The adjusting assembly 6 includes two moving plates 61. The two moving plates 61 are movably arranged at intervals in the air suction cavity 11 along a direction perpendicular to the moving direction of the medium 10 and are connected to the partition assembly 7. The communication part of each air suction area 111 and each air duct 21 is located between the two moving plates 61 to ensure that an air flow passage is always kept connected between the two moving plates 61 when the moving plates 61 move. The periphery of the moving plates 61 is hermetically arranged with the cavity wall of the air suction cavity 11 to avoid air leakage in the air suction area 111, which may affect the adsorption effect. The partition assembly 7 and the moving plates 61 enclose at least two air suction areas 111. When the two moving plates 61 move away from or close to each other, the partition assembly 7 extends or retracts. By adopting the structure of the bidirectional telescopic arrangement of the partition assembly 7 and stretching or retracting the partition assembly 7 when the moving plates 61 move, a sealed structure can be formed in the air suction area 111 formed between the moving plates 61 and the partition assembly 7. Compared with the structure of using a fixed partition to divide the air suction cavity 11 into a fixed space and then making the fixed partition penetrate through the moving plates 61, the design scheme of the present invention can avoid excessive gaps (for example, when the number of the partition assemblies 7 is larger, the number of areas penetrated by the moving plates 61 is more) between the moving plates 61 and the fixed partition when the moving plates 61 reach the moving purpose, which may affect the sealing performance between the moving plates 61 and the partition assembly 7 and reduce the adsorption capacity of the air suction area 111.

[0071] See Figure 8 , Specifically, sliding grooves 113 are provided on the bottom wall and the top wall of the air suction cavity 11 between two adjacent air suction areas 111. The partition assembly 7 is telescopically arranged in the sliding grooves 113 and can be telescoped in the sliding grooves 113, so as to facilitate the installation of the partition assembly 7. It should be noted that a sealing structure is adopted between the partition assembly 7 and the sliding grooves 113, that is, the partition assembly 7 and the sliding grooves 113 are in a sealed structure during the telescoping process or in a stationary state to avoid air leakage between different air suction areas 111. Specifically, a sealing material or the like can be arranged in the gap between the partition assembly 7 and the sliding grooves 113. For example, it can be but is not limited to a felt piece.

[0072] See Figure 2 、 Figure 8 , Specifically, two slide rails 8 are arranged at intervals on the bottom wall and the top wall of the air suction cavity 11 between two adjacent air suction areas 111. A sliding groove 113 is formed between the two slide rails 8, so that the processing technology of the sliding groove 113 can be simplified and the production efficiency can be improved.

[0073] See Figure 9, Further, a first seal 62 is provided on the moving plate 61, and the periphery of the first seal 62 extends to the cavity wall of the air suction cavity 11, so that the space between the periphery of the moving plate 61 and the cavity wall of the air suction cavity 11 can be sealed, ensuring the tightness between the moving plate 61 and the air suction cavity 11. Specifically, the first seal 62 can be, but is not limited to, a felt piece.

[0074] See Figure 8 , Further, the adjusting assembly 6 further includes a lead screw 63 disposed in the air suction cavity 11 and a second driving member (not shown in the figure) disposed outside the platform body 1 and driving the lead screw 63 to rotate. The lead screw 63 passes through the moving plate 61 and is in threaded cooperation with the moving plate 61. The lead screw 63 can drive the two moving plates 61 to move away from or close to each other, so that the moving plate 61 drives the partition assembly 7 to extend or retract.

[0075] See Figure 8 , Specifically, the lead screw 63 can be one piece. A reverse thread is provided on the lead screw 63 within the moving stroke range of the two moving plates 61 respectively. At least one end of the lead screw 63 passes through the platform body 1 and is connected to the driving end of the second driving member; in addition, two lead screws 63 can also be used. The two lead screws 63 correspond to the two moving plates 61 respectively, and the thread directions of the two lead screws 63 are opposite. One end of each of the two lead screws 63 passes through the platform body 1 respectively and is driven to rotate by the second driving member. In this embodiment, two lead screws 63 are used. Two mounting seats 64 are provided in one of the air suction areas 111 in the air suction cavity 11. One end of the lead screw 63 passes through the platform body 1, and the other end is rotatably fixed to the mounting seat 64.

[0076] See Figure 8 and Figure 9, Specifically, the partition assembly 7 includes a first partition 71 and a second partition 72 that are reversibly movably disposed in the air suction cavity, and an intermediate partition 73 that is fixedly disposed in the air suction cavity and located between the first partition 71 and the second partition 72. That is, the first partition 71, the second partition 72, and the intermediate partition 73 are all disposed in the chute 113. The first partition 71 and the second partition 72 are respectively connected to one of the moving plates. A second sealing member is provided at the connection between the first partition 71 and the intermediate partition 73 and at the connection between the second partition 72 and the intermediate partition 73, but the second sealing member does not affect the movement of the first sealing member and the second sealing member at the same time. When the two moving plates move away from or close to each other, the first partition 71 and the second partition 72 are driven to extend or retract. In this way, the intermediate partition 73 can form a connection between the partition assembly 7 and the air suction cavity to realize the positioning of the partition assembly 7 in the air suction cavity. When the two moving plates drive the first partition 71 and the second partition 72 to move away from each other, the area of the air suction area surrounded by the first partition 71 and the second partition 72 when they extend increases. When the moving plates drive the first partition 71 and the second partition 72 to move close to each other, the area of the air suction area surrounded by the first partition 71 and the second partition 72 when they retract decreases. In this way, the width adjustment of the air suction area can be realized.

[0077] Further, when the first partition 71 and the second partition 72 extend to the maximum stroke, the two moving plates respectively abut against the two side walls of the air suction cavity to prevent the first partition 71 and the second partition 72 from separating from the intermediate partition 73. Similarly, when the first partition 71 and the second partition 72 retract, the moving plates can prevent the first partition 71 and the second partition 72 from retracting excessively and then protruding reversely. In this way, the moving plates can also serve as the positioning for the first partition 71 and the second partition 72 when they extend, which can simplify the structure, eliminate the need for additional limiting structures, and reduce the processing difficulty and production cost.

[0078] See Figure 4 , Further, there are at least two first partitions 71 and at least two second partitions 72 respectively. The outermost first partition 71 among the at least two first partitions 71 is connected to one moving plate, and the outermost second partition 72 among the at least two second partitions 72 is connected to the other moving plate. In this way, the telescopic stroke of the partition assembly 7 can be increased to adapt to the widths of media 10 of different sizes.

[0079] See Figure 4, Further, on one side of the outermost first partition plate 71 among at least two first partition plates 71 facing the middle partition plate 73, a first limiting portion 711 is provided, and the first limiting portion 711 is located at one end away from the moving plate connected thereto. On one side of the innermost first partition plate 71 among at least two first partition plates 71 facing away from the middle partition plate 73, second limiting portions 712 are respectively provided at both ends in its moving direction, and on one side facing the middle partition plate 73, a third limiting portion 713 is provided at one end close to the moving plate connected to the first partition plate 71. That is, the innermost first partition plate 71 is provided with three limiting portions (two second limiting portions 712 and one third limiting portion 713), and on opposite sides of the remaining first partition plates 71, fourth limiting portions (not shown in the figure) are respectively provided at both ends in the moving direction of the first partition plate 71. That is, each of the middle first partition plates 71 is provided with four fourth limiting portions; on one side of the outermost second partition plate 72 among at least two second partition plates 72 facing the middle partition plate 73, a fifth limiting portion 721 is provided, and the fifth limiting portion 721 is located at one end away from the moving plate connected thereto. On one side of the innermost second partition plate 72 among at least two second partition plates 72 facing away from the middle partition plate 73, sixth limiting portions 722 are respectively provided at both ends in its moving direction, and on one side facing the middle partition plate 73, a seventh limiting portion 723 is provided at one end close to the moving plate connected to the second partition plate 72. That is, the innermost second partition plate 72 is provided with three limiting portions (two sixth limiting portions 722 and one seventh limiting portion 723), and on adjacent sides of the remaining second partition plates 72, eighth limiting portions (not shown in the figure) are respectively provided at both ends in the moving direction of the second partition plate 72. That is, each of the middle partition plates is provided with four eighth limiting portions; the limiting portions on the same side of two adjacent partition plates are collinear and staggered along the moving direction of the partition plates. When the first partition plate 71 and the second partition plate 72 move, the collinear limiting portions can abut against each other to pull or push the partition plates to extend or retract. In this way, by providing the first limiting portion 711, the second limiting portion 712, the third limiting portion 713, the fourth limiting portion, the fifth limiting portion 721, the sixth limiting portion 722, the seventh limiting portion 723, and the eighth limiting portion, the extension or retraction of the first partition plate 71 and the second partition plate 72 and the positioning after the expansion and contraction can be realized.

[0080] For the convenience of understanding, the following specific examples are further described.

[0081] See Figure 4, when the number of both the first partition plate 71 and the second partition plate 72 is two, the first limiting part 711 is located in the middle of the two second limiting parts 712 and the three are collinearly arranged. The fifth limiting part 721 is located in the middle of the two sixth limiting parts 722 and the three are collinearly arranged. When the first partition plate 71 and the second partition plate 72 move away from each other, the first limiting part 711 can pull the second limiting part 712 in front of the first limiting part 711 in the moving direction to extend the first partition plate 71. The fifth limiting part 721 can pull the sixth limiting part 722 in front of the fifth limiting part 721 in the moving direction to extend the second partition plate 72. When the first partition plate 71 and the second partition plate 72 move closer to each other, the first limiting part 711 can push the second limiting part 712 in front of the first limiting part 711 in the moving direction to retract the second partition plate 72 until the third limiting part 713 abuts against the end of the middle partition plate 73, then the two first partition plates 71 are retracted to the limit position. The fifth limiting part 721 can push the sixth limiting part 722 in front of the fifth limiting part 721 in the moving direction to retract the second partition plate 72 until the seventh limiting part 723 abuts against the other end of the middle partition plate 73, then the two second partition plates 72 are retracted to the limit position;

[0082] When the number of both the first partition plate 71 and the second partition plate 72 is three, the two fourth limiting parts on the middle first partition plate 71 facing the outermost first partition plate 71 are collinear and staggered with the first limiting part 711. The two fourth limiting parts on the first partition plate 71 facing the innermost first partition plate 71 are collinear and staggered with the two third limiting parts 713 on the innermost first partition plate 71. Similarly, the fifth limiting part 721 is collinear and staggered with the two eighth limiting parts on one side of the middle second partition plate 72. The two sixth limiting parts 722 are collinear and staggered with the two eighth limiting parts on the other side of the middle second partition plate 72. For the extension or retraction of the first partition plate 71 and the second partition plate 72, the functions of each limiting part are the same as those of the two first partition plates 71 and the two second partition plates 72 above, and will not be elaborated here. It can be understood that when the number of the first partition plate 71 and the second partition plate 72 is more than three, the installation structure and the number of the limiting parts are exactly the same as those when there are three, and will not be listed one by one here.

[0083] It should be noted that the first limiting part 711, the second limiting part 712, the third limiting part 713, the fourth limiting part, the fifth limiting part 721, the sixth limiting part 722, the seventh limiting part 723 and the eighth limiting part are all arranged at the same height as the partition plate they are on and are attached to the surface of the adjacent partition plate. In this way, the sealing performance between the partition plates and the sealing performance between the partition plates and the following sliding grooves can be ensured.

[0084] See Figure 4, Further, a first connecting portion 731 is provided on the side of the middle partition plate 73 facing the first partition plate 71. The first connecting portion 731 is located at the bottom or top of the end of the middle partition plate 73 away from the moving plate connected to the first partition plate 71. A second connecting portion 732 is provided on the side of the middle partition plate 73 facing the second partition plate 72. The second connecting portion is located at the bottom or top of the end of the middle partition plate 73 away from the first partition plate 71 connected to the first partition plate 71. Both the first connecting portion 731 and the second connecting portion 732 are fixedly connected to the air suction cavity. Specifically, the first connecting portion 731 and the second connecting portion 732 can be fixedly connected to the following slide rail. By arranging the first connecting portion 731 and the second connecting portion 732 at the top or bottom of the middle partition plate 73, the movement of the first partition plate 71 and the second partition plate 72 can be avoided from being interfered.

[0085] The present invention also provides a digital printing device, including the above-mentioned air suction platform. The digital printing device provided by the present invention can improve the adsorption ability of the medium 10, avoid the loss of the adsorption of the medium 10 during the conveying process, thereby being able to avoid phenomena such as slipping and moving of the medium 10. In addition, it can also avoid the phenomenon of ink suction on the nozzle, thereby affecting the ink droplet landing point and the printing effect.

[0086] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air suction platform, characterized in that, Comprising: A platform main body, which is internally provided with a suction cavity, and a plurality of suction holes communicating with the suction cavity are provided on the upper surface. The suction cavity is partitioned into at least two suction areas, and at least two of the suction areas are arranged in a flat manner along the medium transmission direction; An air duct, which is arranged outside the platform main body. At least two air channels are provided in the air duct, and at least two of the air channels correspond to and communicate with at least two of the suction areas one by one. First air outlets corresponding to at least two of the air channels one by one are provided on the air duct, and the first air outlets are used for inputting negative pressure; At least two baffles, which are arranged on the air duct and correspond to at least two of the first air outlets one by one. The baffles close or open the corresponding first air outlets to close or open the corresponding suction areas; A damper driving assembly, which is arranged on the platform main body and includes at least two driving wheels corresponding to at least two of the baffles one by one and rotatably arranged on the platform main body. At least two of the driving wheels can synchronously drive at least two of the baffles to move to control the suction areas to be opened one by one along the medium moving direction until all are opened, and close the suction areas one by one after the medium leaves until all are closed.

2. The air suction platform according to claim 1, characterized in that, The damper driving assembly further includes at least two driving rods, which are movably arranged on the platform main body and correspond to at least two of the driving wheels and at least two of the baffles one by one. A first arc track and a second arc track connected end to end are arranged in the rotation direction of each driving wheel. The curvature of the first arc track is smaller than that of the second arc track. One end of the driving rod can move between the first arc track and the second arc track, and the other end is connected to the baffle. When the driving rod moves in the first arc track, the baffle closes the first air outlet. When the driving rod moves in the second arc track, the baffle opens the first air outlet; At a preset position, the driving rod corresponding to the first driving wheel in a preset direction is placed in the second arc track, and the driving rods corresponding to the remaining driving wheels are placed in the first arc track and are sequentially arranged away from the end point of the first arc track in the moving direction of the driving rod. The first air outlets of at least two of the suction areas in the medium moving direction correspond to at least two of the driving wheels in the preset direction; When at least two of the driving wheels rotate synchronously, the driving rod corresponding to the first driving wheel enters the first arc track from the second arc track, and the driving rods corresponding to the remaining driving wheels sequentially enter the second arc track from the first arc track. At least two of the driving rods control at least two of the baffles to sequentially open at least two of the first air outlets until all are opened and then sequentially close at least two of the first air outlets until all are closed.

3. The air suction platform according to claim 2, characterized in that, The first arc track and the second arc track are combined into a gourd-shaped structure. The included angle between the midpoint connection line of the first arc track and the second arc track and the horizontal line is set as α. The included angle α on each driving wheel is set to adjust the preset position of the driving rod on the first arc track or the second arc track.

4. The air suction platform according to claim 3, characterized in that, In the medium moving direction, let the included angle on the driving wheel corresponding to the first air suction area be α1, the included angle on the driving wheel corresponding to the second air suction area be α2…, and the included angle on the driving wheel corresponding to the nth air suction area be αn. Then the angular differences Δα1, Δα2…Δαn of the included angles α between adjacent driving wheels are such that Δα1, Δα2…Δαn increase linearly.

5. The air suction platform according to claim 2, characterized in that, At least two of the driving wheels are coaxially arranged, the preset direction is the axial direction of the driving wheels, and the first arc track and the second arc track are arranged on the side surfaces of the driving wheels.

6. The air suction platform according to claim 5, characterized in that, The air door driving assembly further includes a first driving member and a transmission shaft arranged on the platform main body. At least two of the driving wheels are spaced apart and installed on the transmission shaft along the axial direction of the transmission shaft, and the first driving member drives the transmission shaft to rotate.

7. The air suction platform according to claim 6, characterized in that, At least two air expanding shafts are arranged at intervals along the axial direction of the transmission shaft. At least two air expanding shafts are configured one-to-one with at least two of the driving wheels, and the driving wheels are fixed on the transmission shaft through the air expanding shafts.

8. The air suction platform according to claim 2, wherein, The outer contour of the driving wheel is adapted to the shape enclosed by the first arc track and the second arc track.

9. The air suction platform according to claim 2, wherein, A roller is provided at one end of the driving rod that moves on the first arc track and the second arc track, and the roller can move on the first arc track and the second arc track.

10. The air suction platform according to any one of claims 1-9, characterized in that, The platform main body further includes an adjusting assembly arranged in the air suction cavity for adjusting the width of the air suction area, wherein the width direction is perpendicular to the medium moving direction.

11. The air suction platform according to claim 10, characterized in that, A bidirectionally telescopic partition assembly is provided between two adjacent air suction areas in the air suction cavity. The adjusting assembly includes two moving plates, which are movably spaced apart in the air suction cavity along a direction perpendicular to the medium moving direction and are connected to the partition assembly. The communication between each air suction area and each air duct is located between the two moving plates. The moving plates can move along a direction perpendicular to the medium movement. The peripheries of the moving plates are hermetically arranged with the cavity wall of the air suction cavity. The partition assembly and the moving plates enclose at least two air suction areas. When the two moving plates move away from or close to each other, the partition assembly extends or retracts.

12. The air suction platform according to claim 11, wherein, The adjusting assembly further includes a lead screw arranged in the air suction cavity and a second driving member arranged outside the platform main body and driving the lead screw to rotate. The lead screw penetrates through the moving plates and is in threaded cooperation with the moving plates, and the lead screw can drive the two moving plates to move away from or close to each other.

13. The air suction platform according to claim 11, characterized in that, The partition assembly includes a first partition and a second partition that are reversibly movably arranged in the air suction cavity and an intermediate partition fixedly arranged in the air suction cavity and located between the first partition and the second partition. The first partition and the second partition are respectively connected to one of the moving plates. A tight and sealed arrangement is provided between the first partition and the intermediate partition and between the second partition and the intermediate partition. When the two moving plates move away from or close to each other, the first partition and the second partition are driven to extend or retract.

14. The air suction platform according to claim 13, characterized in that When the first partition plate and the second partition plate extend to the maximum stroke, the two moving plates are respectively in contact with the two side walls of the air suction cavity.

15. The air suction platform according to claim 13, characterized in that, The first partition plate and the second partition plate are each at least two pieces. The outermost first partition plate among the at least two first partition plates is connected to one of the moving plates, and the outermost second partition plate among the at least two second partition plates is connected to the other moving plate.

16. The air suction platform according to claim 15, characterized in that, On the side of the outermost first partition plate among the at least two first partition plates facing the middle partition plate, a first limiting portion is provided at one end away from the moving plate connected thereto. On the side of the innermost first partition plate among the at least two first partition plates facing away from the middle partition plate, second limiting portions are respectively provided at both ends in its moving direction, and a third limiting portion is provided at one end close to the moving plate connected to the first partition plate on the side facing the middle partition plate. Fourth limiting portions are respectively provided at both ends of the opposite sides of the remaining first partition plates in the moving direction of the first partition plate; On the side of the outermost second partition plate among the at least two second partition plates facing the middle partition plate, a fifth limiting portion is provided at one end away from the moving plate connected thereto. On the side of the innermost second partition plate among the at least two second partition plates facing away from the middle partition plate, sixth limiting portions are respectively provided at both ends in its moving direction, and a seventh limiting portion is provided at one end close to the moving plate connected to the second partition plate on the side facing the middle partition plate. Eighth limiting portions are respectively provided at both ends of the adjacent sides of the remaining second partition plates in the moving direction of the second partition plate; The limiting portions on the same side of two adjacent partition plates are collinear and staggeredly arranged along the moving direction of the partition plates. When the first partition plate and the second partition plate move, the collinear limiting portions can be in contact with each other to pull or push the partition plates to extend or retract.

17. The air suction platform according to claim 11, wherein, Sliding grooves are provided on both the bottom wall and the top wall of the air suction cavity between two adjacent air suction areas. The partition plate assembly is telescopically arranged in the sliding grooves and can be telescoped in the sliding grooves.

18. A digital printing device, characterized in that, Comprising the air suction platform according to any one of claims 1-17.

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