An air box and a flattening device applied to a printing paper flattening device

Abstract

The present application provides an air box and a flattening device applied to a printing paper flattening device. The air box includes a box body and a box cover that are connected to each other; an air inlet is provided on a side of the box body away from the box cover, and the air inlet is connected to a first air storage cavity, and the first air storage cavity is arranged inside the box body; an air outlet is provided on the box body, and the air outlet is connected to a second air storage cavity, and the second air storage cavity is arranged inside the box body; the first air storage cavity is connected to the second air storage cavity through a first channel arranged inside the box body; the air outlet includes a first diversion groove and a second diversion groove that are arranged in parallel with each other; a first exhaust hole is arranged inside the first diversion groove; a second exhaust hole is arranged inside the second diversion groove, and the diameter of the first exhaust hole is smaller than the diameter of the second exhaust hole. The cross-sectional dimension of the air box of the present application is small, the shape is regular, the overall structural dimension of the flattening device is small, the space adaptability is high, the on-site layout and adjustment are simple, and the flattening effect on the printing paper is stable.

Description

Technical Field

[0001] The present application relates to the technical field of printing product quality inspection, and particularly relates to an air box and a flattening device applied to a printing paper flattening device for printed matter. Background Art

[0002] With the continuous development of the printing industry, the quality requirements for printing products are getting higher and higher. In the printing industry, a visual inspection system is generally used to detect the quality of printing products in real time. When using a visual inspection system to detect the quality of printing products, it is necessary to ensure the stable movement of the printing products. Printing products generally refer to printing paper. The movement of the printing paper is controlled by the grippers of the printing unit to grip the paper head, thereby driving the movement of the printing paper. When the grippers hold the paper head and move on the rollers and transfer between the rollers, the printing paper will be affected by the combined action of air resistance, centrifugal force, paper head driving force, internal stress of the printing paper itself, etc., resulting in irregular and unstable movements of the printing paper such as up and down undulation, paper edge warping, and left and right yaw, further leading to the instability of the state of the printing paper, that is, the printing paper has local deformation. The instability of the state of the printing paper, that is, the local deformation of the printing paper will seriously affect the imaging quality of the visual inspection system, and further affect the detection accuracy of the visual inspection system for the defects of the printing paper.

[0003] In the prior art, a flattening system is generally used to flatten the locally deformed printing paper to ensure that the imaging quality of the visual inspection system is not affected by the local deformation of the printing paper. As Figure 1 shown, the flattening system specifically includes: a blowing flattening device, an air filter, a turbo fan, and an air duct. When the offset press is working, the impression cylinder will rotate counterclockwise. One end of the printing product, that is, the printing paper, is fixed on the impression cylinder, and the other end is in a free state. Under the action of centrifugal force, the printing product, that is, the printing paper, will deviate from the surface of the impression cylinder. The blowing flattening device is installed at a position close to the impression cylinder of the offset press. When the offset press is running normally, the turbo fan starts to work. Air enters the turbo fan through the air filter, and the strong air flow formed by it enters both ends of the blowing flattening device through air duct a and air duct b, and then blows out from the panel of the blowing flattening device. The strong air flow acts on the surface of the printing product, so that the printing product can be closely attached to the surface of the impression cylinder under the action of the strong air flow, completing the flattening of the printing product, that is, the printing paper.

[0004] However, the air ducts used in the existing flattening system have a large diameter, resulting in a large overall structural size of the flattening system, difficult on-site installation and layout, and poor space adaptability. Summary of the Invention

[0005] The present application provides an air box and a flattening device applied to a printed paper flattening device, so as to solve the problems in the prior art that the diameter of the air duct is relatively large, resulting in a relatively large overall structural size of the flattening system, difficult on-site installation and layout, and poor space adaptability.

[0006] On the one hand, the present application provides an air box applied to a printed paper flattening device. The air box is designed as a rectangular multi-cavity structure, including: a box body and a box cover connected to each other;

[0007] Wherein, at least two air inlets are arranged on the side of the box body away from the box cover. At least two of the air inlets are arranged on the same central axis and are both connected to the first air storage cavity, and the first air storage cavity is arranged inside the box body;

[0008] An air outlet is arranged on the box body, and the air outlet is arranged at one end away from at least two of the air inlets. The air outlet is connected to the second air storage cavity, and the second air storage cavity is arranged inside the box body;

[0009] The first air storage cavity is connected to the second air storage cavity through a first channel arranged inside the box body;

[0010] The air outlet is arranged on the side away from the first channel. The air outlet includes a first diversion groove and a second diversion groove, and the first diversion groove and the second diversion groove are arranged in parallel;

[0011] At least two first exhaust holes are arranged inside the first diversion groove, and the first exhaust holes communicate with each other;

[0012] At least two second exhaust holes are arranged inside the second diversion groove, and the second exhaust holes communicate with each other, and the diameter of the first exhaust hole is smaller than the diameter of the second exhaust hole.

[0013] In the above technical solution, the first exhaust hole and the second exhaust hole are designed with different diameters, which can play different roles in flattening the printed paper. The second exhaust hole is mainly used to resist the upward warping of the printed paper, and the first exhaust hole is used to smooth the printed paper. Moreover, both the first diversion groove and the second diversion groove are designed as long and narrow slits, which can effectively inhibit the airflow jetting forward and backward.

[0014] In a preferred embodiment of the present application, a support surface structure formed by bonding with an adhesive is further included between the first air storage cavity and the second air storage cavity; the support surface structure is arranged inside the box body and the box cover, and is arranged between the first air storage cavity and the second air storage cavity, and is used to partition the plurality of first channels to form an intermittent structure.

[0015] In a preferred embodiment of the present application, at least two of the air inlets are evenly distributed within the area of the first air storage cavity, and the distances between the respective air inlets are equal.

[0016] In a preferred embodiment of the present application, at least two of the first exhaust holes are evenly distributed inside the first diversion groove, and the distances between the respective first exhaust holes are equal.

[0017] In a preferred embodiment of the present application, at least two second exhaust holes are evenly distributed inside the second diversion groove, and the distances between the respective second exhaust holes are equal.

[0018] On the other hand, the present application further provides a flattening device, which includes: an air box, a gas source device, and a main air inlet pipe. One end of the main air inlet pipe is respectively connected to at least two air inlets of the air box through a quick-connect reducing device, and the other end of the main air inlet pipe is connected to the gas source device.

[0019] In the above technical solution, the quick-connect reducing device can adopt a quick-connect reducing tee or a quick-connect reducing cross, so as to convert one main air inlet pipe into multiple sub-air inlet pipes to respectively connect multiple air inlets.

[0020] In a preferred embodiment of the present application, the flattening device further includes a roller. The air box is arranged outside the roller and is arranged parallel to the camera shooting line.

[0021] In a preferred embodiment of the present application, the air box is installed on one side of the printed paper, and the distance between the air box and the printed paper is 6 mm - 15 mm, and the printed paper is attached to the roller.

[0022] In a preferred embodiment of the present application, the distance between the camera shooting line and the air box is set to 2 mm - 10 mm.

[0023] In a preferred embodiment of the present application, the gas source device adopts an air compressor capable of providing compressed air.

[0024] In a preferred embodiment of the present application, the main air inlet pipe includes a hard pipe and a flexible pipe. The hard pipe is used in a flattening device where the linear distance between the gas source device and the air box is greater than 10 m; the flexible pipe is used in a flattening device where the linear distance between the gas source device and the air box is not greater than 10 m.

[0025] The air box and the flattening device provided by the present application and applied to a printed paper flattening device have the following beneficial effects compared with the prior art:

[0026] (1) The air box of the present application is designed with a multi-cavity split structure, which can evenly press the gas entering the air box through the first air storage cavity and the second air storage cavity inside the air box for multiple times, so that the gas maintains consistent pressure in the length direction of the air box, thereby making the air flow pressure near different exhaust holes (including the first exhaust hole and the second exhaust hole) basically the same, ensuring the stability of the air flow discharged from different exhaust holes, and further ensuring a stable flattening effect on the printed paper.

[0027] (2) The first air storage cavity and the second air storage cavity of the present application are set as an intermittent structure, which can greatly reduce the gas pressure area borne by the box cover, thereby ensuring that the box cover will not produce large compressive deformation.

[0028] (3) The connection between the box body and the box cover that make up the air box of the present application combines cementing and threaded connection, which can ensure the reliability of the connection of the air box while ensuring the sealing of the internal cavity structure of the air box.

[0029] (4) When the present application is in use, the long side (i.e., the 80-mm side) is basically vertical, which greatly enhances the lateral stiffness of the part. It is ensured that when the length of the air box exceeds 1 m, only its two ends need to be fixed and there will be no bending in the middle part. The above performance enables the air box to be serially extended in the length direction according to the on-site situation during use to be applicable to different printed paper widths or different on-site situations.

[0030] (5) The diameter of the air inlet pipe used in the air box of the present application is small, and the cross-sectional size of the air box is small, with a regular shape. The overall structural size of the flattening device is small, with high space adaptability, simple on-site layout and adjustment, and stable flattening effect on the printed paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the present application, the accompanying drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other accompanying drawings can also be obtained based on these drawings without creative efforts.

[0032] Figure 1 is a schematic structural diagram of a flattening system in the prior art;

[0033] Figure 2 is a schematic structural diagram of a printed paper blowing and flattening device in the prior art;

[0034] Figure 3 is a schematic overall structural diagram of an air box applied to a printed paper flattening device in Embodiment 1 of the present application;

[0035] Figure 4Schematic diagram of the first cross-sectional structure of an air box applied to a printing paper flattening device in Embodiment 1 of the present application;

[0036] Figure 5 Schematic diagram of the second cross-sectional structure of an air box applied to a printing paper flattening device in Embodiment 1 of the present application;

[0037] Figure 6 Partial bottom view structure diagram of an air box applied to a printing paper flattening device in Embodiment 1 of the present application;

[0038] Figure 7 Schematic diagram of the structure of a flattening device in Embodiment 2 of the present application;

[0039] Explanation of reference numerals:

[0040] Figure 1 : 1-1, blowing and flattening mechanism; 2-1, camera scanning line; 2-2, camera imaging point; 2-3, printed product; 2-4, impression cylinder;

[0041] Figure 2 : 1, air inlet; 2, air duct cavity; 3, air outlet;

[0042] Figures 3 - 7 : 1 - air box, 10 - box body, 11 - box cover, 12 - air inlet, 13 - first air storage cavity, 14 - air outlet, 15 - second air storage cavity, 16 - first channel, 17 - support surface structure, 18 - fixing screw, 19 - first diversion groove, 20 - second diversion groove, 21 - first exhaust hole, 22 - second exhaust hole; 2 - air source device; 3 - main air inlet pipe; 4 - roller; 5 - printing paper; 6 - paper detection point; 7 - camera shooting line. Detailed implementation manners

[0043] To make the objectives, implementation manners and advantages of the present application clearer, the following will clearly and completely describe the exemplary implementation manners of the present application with reference to the accompanying drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0044] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0045] Based on the exemplary embodiments described in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the appended claims of this application. In addition, although the disclosure in this application is introduced according to one or several exemplary instances, it should be understood that each aspect of these disclosures can also separately constitute a complete implementation manner.

[0046] It should be noted that the brief description of the terms in this application is only for the convenience of understanding the following described embodiments, rather than intending to limit the embodiments of this application. Unless otherwise specified, these terms should be understood in their ordinary and general meanings.

[0047] For the convenience of presenting the technical solutions of the application, some concepts involved in this application will be described first below.

[0048] From the time when the printing paper 5 is fed until it is collected, the paper head is clamped by the grippers, that is, during the movement of the printing paper 5, only the state of the paper head is restricted, and other parts of the printing paper 5 are in a free state.

[0049] In this application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Additionally, the terms "comprising", "also comprising", "for", "mainly for" or any other variant are intended to cover non-exclusive inclusion, so that it includes not only the explicitly listed elements but also other elements not explicitly listed. Moreover, the terms for describing directions in this application, such as "inside", "outside", "above", "below", etc., are described based on the positions of the drawings of this application or the orientation of the product during actual use. Therefore, the solutions of this application will not be unclear.

[0050] Except for a flattening system disclosed in the background art of this application, as Figure 2 shown, the prior art also includes a printing paper blowing and flattening device, comprising: an air inlet, an air duct cavity, and more than one air outlet. The inner cross-sectional area of the air duct cavity is greater than or equal to the area of the air inlet, the area of the air inlet is greater than or equal to the total area of the air outlets. All the air outlets are on a plane and have the same area size. The middle air outlet is perpendicular to the air duct cavity, and the other air outlets except the middle air outlet are inclined 0 - 10 degrees to both sides relative to the middle air outlet. However Figure 2A printing paper blowing and flattening device as shown. In actual use, it is necessary to ensure that the middle position of the printing paper coincides with the middle position of the air duct. However, it is impossible to guarantee the flattening effect of the printing paper. When the flattening is not good, it is necessary to increase the number of air ducts in the middle position to increase the density to ensure the flattening effect. Moreover, the arrangement angles of the air ducts at different positions are different, the manufacturing process is complex, the overall structural size of the printing paper blowing and flattening device is large, and the space adaptability is poor.

[0051] Embodiment 1

[0052] See Figures 3 - 6 , this Embodiment 1 provides an air box applied to a printing paper flattening device. As shown in Figure 3 and Figure 4 , the air box 1 is designed as a rectangular multi-cavity structure, including: a box body 10 and a box cover 11 that are connected to each other;

[0053] Among them, as shown in Figure 3 , at least two air inlets 12 are provided on the side of the box body 10 away from the box cover 11. At least two of the air inlets 12 are arranged on the same central axis. As shown in Figure 4 , the air inlets 12 are all connected to a first air storage cavity 13. The first air storage cavity 13 is arranged inside the box body 10. Figure 4 The arrows in

[0054] indicate the flow direction of the compressed air inside the box body 10 of the air box 1. Figure 6 As shown in Figure 4 , an air outlet 14 is provided on the box body 10, and the air outlet 14 is arranged at one end away from at least two of the air inlets 12. As shown in

[0055] As shown in Figure 5 , the air outlet 14 is connected to a second air storage cavity 15. The second air storage cavity 15 is arranged inside the box body 10;

[0056] As shown in Figure 5 , the first air storage cavity 13 is connected to the second air storage cavity 15 through a first channel 16 arranged inside the box body 10. A support surface structure 17 formed by bonding with an adhesive is further included between the first air storage cavity 13 and the second air storage cavity 15. The support surface structure 17 is arranged inside the box body 10 and the box cover 11, and is arranged between the first air storage cavity 13 and the second air storage cavity 15 for partitioning a plurality of the first channels 16 to form a discontinuous structure. The box cover 11 is detachably connected to one side of the box body 10 through a fixing screw 18; Figure 6As shown, the air outlet 14 includes a first diversion groove 19 and a second diversion groove 20, and the first diversion groove 19 and the second diversion groove 20 are arranged in parallel with each other;

[0057] As Figure 6 shown, at least two first exhaust holes 21 are uniformly distributed inside the first diversion groove 19, and the first exhaust holes 21 communicate with each other, and the distances between the first exhaust holes 21 are equal;

[0058] As Figure 6 shown, at least two second exhaust holes 22 are uniformly distributed inside the second diversion groove 20, and the second exhaust holes 22 communicate with each other, and the distances between the second exhaust holes 22 are equal. The diameter of the first exhaust hole 21 is smaller than the diameter of the second exhaust hole 22; it should be noted that in this Embodiment 1, the area of the first exhaust hole 21 is 30%-80% of the area of the second exhaust hole 22.

[0059] In the above technical solution, designing the first exhaust hole 21 and the second exhaust hole 22 with different diameters can play different roles in flattening the printed paper 5. The second exhaust hole 22, that is, the large hole discharges more gas and has greater force, which is mainly used to resist the upward warping of the printed paper 5. The first exhaust hole 21, that is, the small hole discharges less gas and sprays outwards in a conical state. The airflow is stable at a certain range away from the first exhaust hole 21, which is used to smooth the printed paper 5. Moreover, both the first diversion groove 19 and the second diversion groove 20 are designed as long and narrow slits, which can effectively suppress the airflow spraying forward and backward, have higher utilization efficiency of the airflow, better flattening effect, and can shape the conical airflow sprayed out by the first exhaust hole 21 and the second exhaust hole 22 into a fan-shaped spraying airflow. Multiple fan-shaped spraying airflows can form an air curtain, and the two diversion grooves form two air curtains. In addition, those skilled in the art can select the corresponding sizes of the first exhaust hole 21 and the second exhaust hole 22, as well as the specific number of the first exhaust hole 21 and the second exhaust hole 22 and the distances between adjacent two first exhaust holes 21, and the distances between adjacent two second exhaust holes 22 according to the actual exhaust situation. This Embodiment 1 does not make specific limitations on them.

[0060] In another specific implementation manner of this Embodiment 1, the first exhaust hole 21 and the second exhaust hole 22 can also be both set as small holes. However, with this design, it is necessary to shorten the distance between the air outlet 14 of the air box 1 and the printed paper 5. Otherwise, due to the divergence effect of the air, the pressure of the airflow on the printed paper 5 will be insufficient, and the printed paper 5 cannot be flattened, and the flattening effect is poor.

[0061] In another specific implementation manner of this Embodiment 1, the first exhaust hole 21 and the second exhaust hole 22 can also be both set as large holes. However, with this design, when the trailing edge of the printed paper 5 is between the first exhaust hole 21 and the second exhaust hole 22, a large amount of air flow will enter the trailing edge, causing the trailing edge to float and the printed paper 5 unable to be flattened, resulting in a poor flattening effect.

[0062] In another specific implementation manner of this Embodiment 1, only one row of exhaust holes can also be designed. For example, it can be designed as the first exhaust hole 21, which can be designed as a large hole or a small hole. With this design, the exhausted air flow can only form a single air curtain acting on a line of the printed paper 5, and the acting area of the pressure is small, making it easily affected by the characteristics of the printed paper 5, including the leading edge, trailing edge, and paper length, etc., and the flattening effect is unstable.

[0063] Furthermore, as Figure 3 shown, in a specific implementation manner of this Embodiment 1, the number of air inlets 12 is 4, and the 4 air inlets 12 are evenly distributed within the area of the first air storage cavity 13, and the distance between every two adjacent air inlets 12 is equal. Its specific distance can be changed accordingly according to the length of the first air storage cavity 13 or the length of the air box 1 during actual use. The number of air inlets 12 can also be changed accordingly according to the length of the first air storage cavity 13 or the length of the air box 1, so as to achieve a better flattening effect on the printed paper 5.

[0064] Even further, in this Embodiment 1, the diameters of the 4 air inlets 12 are all set to 12 mm. However, those skilled in the art can also change the diameter size of the air inlets 12 during actual use. The diameter size of the air inlets 12 disclosed in the Embodiment 1 of this application is only the optimal diameter size.

[0065] Furthermore, in the first embodiment, the air box 1 is designed as a rectangular multi-chamber structure. The common manufacturing method for the chamber structure is casting. However, the surface of the chamber structure obtained by casting is relatively rough, which is not conducive to the passage of high-speed flowing gas. Therefore, in the technical solution of the first embodiment, one surface of the chamber structure is designed as an assembly structure, that is, the inner surface of the chamber structure becomes the outer surface of the part of the box body 10, which solves the processing problem inside the chamber structure. The box body 10 of the first embodiment is machined by a milling machine, and all machining positions are open to the outside, without machining difficulties. In addition, in order to enable the air box 1 to be used in a narrow space environment, the box cover 11 cannot be too thick. The box cover 11 of the first embodiment is designed as a thin sheet metal structure. However, due to the large gas pressure inside the air box 1, if one surface of the chamber structure is designed as a thin sheet metal structure, the connection between the box body 10 and the box cover 11 has extremely high requirements for the processing and manufacturing process. Therefore, in the first embodiment, a discontinuous structure is designed between the first air storage chamber 13 and the second air storage chamber 15, that is, a part is connected through the first channel 16, and the other part is separated by the support surface structure 17. By adopting this structure, the area of the box cover 11 bearing the gas pressure is greatly reduced, and the box cover 11 transfers the pressure it bears to the box body 10 through a plurality of fixing screws 18, so as to ensure that the box cover 11 does not produce large deformation due to excessive pressure. Further, the contact surface between the box body 10 and the box cover 11 is brushed with glue to ensure the sealing of the air box 1. By adopting the air box 1 structure of the first embodiment, when the chamber bears a gas pressure of 0.6 MPa, the box cover 11 can still be ensured not to deform and the air box 1 does not leak air. At the same time, the structure of the air box 1 of the first embodiment is simpler and has better performance.

[0066] Embodiment 2

[0067] Corresponding to the first embodiment of the air box applied to the printing paper flattening device described above, the present application also provides a second embodiment of the flattening device. As Figure 7 shown, the flattening device includes: an air box 1, a gas source device 2, a main intake pipe 3, and a roller 4. One end of the main intake pipe 3 is respectively connected to at least two air inlets 12 of the air box 1 through a quick-connect reducer device ( Figure 7 not shown in the figure), and the other end of the main intake pipe 3 is connected to the gas source device 2; the air box 1 is arranged outside the roller 4 and is arranged parallel to the camera shooting line 7.

[0068] Furthermore, in the second embodiment, the air box 1 is installed on one side of the printing paper 5, and the distance between the air box 1 and the printing paper 5 is 6 mm - 15 mm, and the printing paper 5 is attached to the roller 4; in addition, Figure 7 the point where the camera shooting line 7 coincides with the roller 4 in the figure is the paper detection point 6; specifically, in the second embodiment, as Figure 7As shown, the distance between the air outlet 14 of the air box 1 and the printing paper 5 is 10 mm.

[0069] Furthermore, in Embodiment 2, the cross-section of the box body 10 of the air box 1 is a rectangle with a width of 20 mm and a height of 80 mm.

[0070] In addition, it should be specifically noted that in Embodiment 2, the quick-connect variable-diameter device ( Figure 7 not shown in the figure) can adopt a quick-connect variable-diameter four-way joint, that is, convert the main inlet pipe 3 into 3 branch inlet pipes with a diameter of 12 mm. The branch inlet pipes are the branch pipes of the main inlet pipe 3, and the 3 branch inlet pipes with a diameter of 12 mm are respectively connected to the 3 air inlets 12; it can also adopt a quick-connect variable-diameter five-way joint, that is, convert the main inlet pipe 3 into 4 branch inlet pipes with a diameter of 12 mm, and the 4 branch inlet pipes with a diameter of 12 mm are respectively connected to the 4 air inlets 12.

[0071] Further, in a specific implementation manner of Embodiment 2, the distance between the camera shooting line 7 and the air box 1 is set to 2 mm - 10 mm; specifically, in Embodiment 2, as Figure 7 shown, the distance between the camera shooting line 7 and the air box 1 is set to 5 mm.

[0072] Further, in a specific implementation manner of Embodiment 2, the air source device 2 adopts an air compressor capable of providing compressed air, and the distance between the air source device 2 and the using end, that is, the air box 1, can be relatively far, and the distance does not affect the normal use of the air source device 2.

[0073] Further, in a specific implementation manner of Embodiment 2, the main inlet pipe 3 includes a hard pipe and a flexible pipe ( Figure 7 not shown in the figure). The hard pipe is used in the flattening device where the linear distance between the air source device 2 and the air box 1 is greater than 10 m; the flexible pipe is used in the flattening device where the linear distance between the air source device 2 and the air box 1 is not greater than 10 m; specifically, in Embodiment 2, when the main inlet pipe 3 is laid with a hard pipe, the hard pipe needs to use a trachea with a diameter greater than 20 mm; when the main inlet pipe 3 is laid with a flexible pipe, the flexible pipe needs to use a trachea with a diameter of about 16 mm.

[0074] It should be specifically noted that in Embodiment 2, each parameter is the best range or the best value for implementing the technical solution of the present application. Those skilled in the art can still make corresponding adjustments according to the specific actual situation during actual use. However, the technical solution obtained after making simple parameter modifications and adjustments according to the technical solution of the present application still falls within the protection scope of the technical solution of the present application.

[0075] In Embodiment 1 and Embodiment 2 of the present application, the working principle of the air box 1 is as follows:

[0076] As Figure 4 shown, first, gas, that is, compressed air, is introduced through the air inlet 12. When the gas, that is, compressed air, reaches the first storage cavity 13 connected to the air inlet 12 after passing through the air inlet 12, a part of the gas, that is, compressed air, is pre-stored in the first storage cavity 13 as a transfer. After the gas flows into the first storage cavity 13, it quickly fills the first storage cavity 13 to ensure the uniformity of the gas pressure inside the first storage cavity 13. The specific process is as follows: When the gas, that is, compressed air, reaches the first storage cavity 13, the movement of the gas is restricted by the cavity wall of the first storage cavity 13, forming a turbulent flow inside the first storage cavity 13 and stirring the gas inside the entire first storage cavity 13. At this time, the high-pressure and high-speed gas quickly flows to the low-pressure and low-speed area, so as to ensure that the gas pressure in the first storage cavity 13 is basically the same;

[0077] Secondly, after the gas is evenly pressured inside the first storage cavity 13, it enters the second storage cavity 15 through the first channel 16 connecting the first storage cavity 13 and the second storage cavity 15, and is evenly pressured for the second time inside the second storage cavity 15;

[0078] Finally, the gas, that is, compressed air, after being evenly pressured twice is discharged from the air box 1 through the air outlet 14. At this time, the air flow at the air outlet 14 is stable, that is, the air flow pressures near the multiple first exhaust holes 21 and the multiple second exhaust holes 22 at the air outlet 14 are basically the same. As Figure 7 shown, the gas discharged from the air box 1 evenly blows on the surface of the printing paper 5, so as to evenly press the printing paper 5 onto the roller 4 arranged below the printing paper 5, complete the flattening of the printing paper 5, and ensure the stability of the flattening effect.

[0079] It should be noted that the markings for the air inlet 12 and the air outlet 14 in Figure 7 are only for the convenience of explaining the solution, but they do not correspond to the specific structures and quantities of the air inlet 12 and the air outlet 14 on the air box 1. The specific structures and quantities of the air inlet 12 and the air outlet 14 can be obtained by referring to other drawings. Therefore, Figure 7 the markings in will not cause the technical solution of the present application to be unclear. Secondly, Figure 7 the gas source device 2 and the main intake pipe 3 in are only simplified schematic diagrams drawn to illustrate the overall structure of the present solution, and do not represent their positions and sizes in actual use, and will not cause the solution of the present application to be unclear. In addition, it should be noted that since the entire structure of the air box 1 is relatively long, therefore, Figure 5 and Figure 6 two air inlets 12 and their corresponding other structural parts in the middle are omitted to show the complete drawings, but it does not affect the implementation of the technical solution of the present application.

Claims

1. An air box applied to a printing paper flattening device, characterized in that, the air box is designed as a rectangular multi-cavity structure, including: a box body and a box cover connected to each other; wherein, at least two air inlets are provided on a side of the box body away from the box cover, the at least two air inlets are arranged on the same central axis and are both connected to a first air storage cavity, and the first air storage cavity is arranged inside the box body; an air outlet is provided on the box body, and the air outlet is arranged at one end away from the at least two air inlets, and the air outlet is connected to a second air storage cavity, and the second air storage cavity is arranged inside the box body; the first air storage cavity is connected to the second air storage cavity through a first channel arranged inside the box body; the air outlet is arranged on a side away from the first channel, and the air outlet includes a first diversion groove and a second diversion groove, and the first diversion groove and the second diversion groove are arranged parallel to each other; at least two first exhaust holes are arranged inside the first diversion groove, and the respective first exhaust holes communicate with each other; at least two second exhaust holes are arranged inside the second diversion groove, the respective second exhaust holes communicate with each other, and the diameter of the first exhaust hole is smaller than the diameter of the second exhaust hole.

2. An air box applied to a printing paper flattening device according to claim 1, characterized in that, a support surface structure formed by bonding with an adhesive is further included between the first air storage cavity and the second air storage cavity; the support surface structure is arranged inside the box body and the box cover, and is arranged between the first air storage cavity and the second air storage cavity, and is used for partitioning the plurality of first channels to form an intermittent structure.

3. An air box applied to a printing paper flattening device according to claim 1, characterized in that, the at least two air inlets are evenly distributed in the area of the first air storage cavity, and the distances between the respective air inlets are equal.

4. An air box applied to a printing paper flattening device according to claim 1, characterized in that, the at least two first exhaust holes are evenly distributed inside the first diversion groove, and the distances between the respective first exhaust holes are equal.

5. An air box applied to a printing paper flattening device according to any one of claims 1-4, characterized in that, the at least two second exhaust holes are evenly distributed inside the second diversion groove, and the distances between the respective second exhaust holes are equal.

6. A flattening device, characterized in that, it adopts an air box applied to a printing paper flattening device according to any one of claims 1-5. The flattening device includes: an air box, a gas source device and a main air inlet pipe. One end of the main air inlet pipe is respectively connected to at least two air inlets of the air box through a quick-insert variable diameter device, and the other end of the main air inlet pipe is connected to the gas source device.

7. A flattening device according to claim 6, characterized in that, the flattening device further includes a roller, and the air box is arranged outside the roller and is arranged parallel to the camera shooting line.

8. A flattening device according to claim 6 or 7, characterized in that, The air box is installed on one side of the printed paper, and the distance between the air box and the printed paper is 6 mm - 15 mm. The printed paper is attached to the roller.

9. A flattening device according to claim 7, wherein, the distance between the camera shooting line and the air box is set to be 2 mm - 10 mm.

10. A flattening device according to claim 6, wherein, the air source device uses an air compressor capable of providing compressed air.

11. A flattening device according to claim 6, wherein, the main air inlet pipe includes a hard pipe and a flexible pipe, the hard pipe is used in the flattening device where the linear distance between the air source device and the air box is greater than 10 m; the flexible pipe is used in the flattening device where the linear distance between the air source device and the air box is not greater than 10 m.

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