Printing device and printing method

Abstract

The invention belongs to the technical field of solar energy manufacturing, and particularly provides a printing device and a printing method. The screen frame is arranged on the printing screen, a fixing structure is arranged outside the screen frame, and the fixing structure is used for positioning and fixing the printing screen; the printing cylinder is used for storing slurry and is movably arranged in the screen frame up and down, and a plurality of leakage holes are formed in the bottom of the printing cylinder; the air pump is arranged on the printing cylinder and is used for applying positive pressure to the interior of the printing cylinder, so that the printing screen plate is uniformly filled with the slurry through the leakage holes; wherein in the upward and downward movement process of the printing cylinder, the outer wall of the printing cylinder and the inner wall of the screen frame are always kept in a sealed state. The printing complexity can be reduced, the slurry is not influenced by the external environment, the problem of blocking of the screen printing plate is avoided, the usage amount of the slurry can be remarkably controlled, the cost is reduced, and the metallization productivity of the solar cell is improved.

Description

Technical Field

[0001] The present application relates to the technical field of solar energy manufacturing, and particularly to a printing device and a printing method. Background Art

[0002] In the process of manufacturing solar cells, the electrode paste is usually printed onto a predetermined position of the cell by means of screen printing, and electrodes are formed after sintering. The conventional screen printing mode relies on a squeegee to apply a sufficient amount of paste laid on the screen plate under a certain pressure through a certain movement path, so that the paste penetrates through a preset pattern on the screen plate, and finally a metal paste with a corresponding pattern is left on the surface of the carrier, that is, a metal grid line is obtained.

[0003] However, the above printing method requires repeated adjustment of the printing parameters on the printing machine table to maintain the grid line pattern position, grid line appearance, etc. In addition, the paste is exposed to the air environment on the screen plate for a long time, and the organic components are easily volatilized, which easily causes the paste to block the screen plate, resulting in broken grid phenomenon and affecting the production capacity; and it is also easily contaminated by impurities in the air, affecting the line resistance of the grid line itself and the effective collection of carriers by the device. More importantly, if the paste needs to be diluted, all the paste needs to be recovered, but in reality, there will inevitably be waste during recovery, which will undoubtedly increase the cost. Moreover, after the service life of the squeegee rubber strip and the screen plate reaches the limit, they also need to be replaced, and the paste will also be wasted during this period.

[0004] Therefore, there is an urgent need to provide a printing device and a printing method to solve the above-mentioned technical problems. Summary of the Invention

[0005] Based on this, in order to overcome the defects of the prior art, the present application provides a printing device and a printing method. The printing device cancels the squeegee structural member of the traditional screen printing, can greatly reduce the complexity caused by printing parameters, can significantly control the usage amount of the paste, reduce the manufacturing cost, and greatly improve the metallization production capacity of solar cells.

[0006] To achieve the above object, the present application adopts the following technical solutions:

[0007] On the one hand, the present application provides a printing device, which includes: a printing screen; a screen frame placed on the printing screen, and the outside of the screen frame has a fixing structure for positioning and fixing the printing screen; a printing cylinder for storing slurry, and the printing cylinder is movably arranged up and down in the screen frame, and the bottom of the printing cylinder has a plurality of slurry leakage holes; an air pump arranged on the printing cylinder for applying positive pressure to the inside of the printing cylinder to make the slurry uniformly pass through the leakage holes and fill the printing screen; wherein, during the upward and downward movement of the printing cylinder, a sealed state is always maintained between the outer wall of the printing cylinder and the inner wall of the screen frame.

[0008] Preferably, the printing device further includes a driving member; the driving member is arranged outside the screen frame and is used to control the lifting or lowering of the printing cylinder in the screen frame.

[0009] Preferably, two or more first lug structures are symmetrically arranged on the outer wall of the screen frame along the circumferential direction; the outer wall of the printing cylinder has a second lug structure corresponding to the first lug structure; the driving member is arranged between the first lug structure and the second lug structure for driving the printing cylinder to move vertically relative to the screen frame.

[0010] Preferably, the bottom of the screen frame is closely attached to the surface of the printing screen; a first gap is left between the outer wall of the screen frame and the inner wall of the printing screen.

[0011] Preferably, the range of the first gap is between 0 mm and 50 mm.

[0012] Preferably, the lower limit of the movement of the printing cylinder is the upper surface of the printing screen; the upper limit of the movement of the printing cylinder is lower than the height of the screen frame; wherein, the upper surface of the printing screen is the initial position of the movement of the printing cylinder.

[0013] Preferably, a second gap is left between the outer wall of the printing cylinder and the inner wall of the screen frame; a sealing rubber strip is arranged in a circumferential circle on the outer wall of the printing cylinder, and the outside of the sealing rubber strip is closely attached to the inner wall of the screen frame.

[0014] Preferably, the range of the second gap is between 0 mm and 10 mm.

[0015] Preferably, the printing device further includes a stirring member arranged in the printing cylinder for stirring the slurry in the printing cylinder.

[0016] A preferred solution is that the air pump is arranged at the exact center of the top of the printing cylinder, and the internal rotating member is connected to the stirring member via a connecting shaft to drive the stirring member to stir.

[0017] A preferred solution is that the fixing structure includes a pin shaft; a pin hole is provided on the outer wall of the screen frame; a through hole corresponding to the pin hole is provided on the outer wall of the printing screen; the pin shaft extends into the pin hole through the through hole to fix and position the printing screen and the screen frame.

[0018] On the other hand, the present invention also provides a printing method, which uses the above-mentioned printing device to perform printing.

[0019] Beneficial effects of this application:

[0020] The principle of the printing device of the present application is mainly to use air pressure combined with mechanical movement to squeeze so that the slurry and other substances placed in a certain closed space can leak out smoothly. It mainly includes key devices such as a printing screen, a screen frame, a printing cylinder, and an air pump. The device uses the screen frame to limit the position of the printing cylinder and the printing screen, wherein the printing cylinder is used to place the slurry, and the bottom of the printing cylinder has leakage holes of a certain density, size and shape for leaking ink; the air pump is placed above the printing cylinder to provide a certain release pressure to the slurry inside the printing cylinder, so that the slurry can better leak out from the leakage holes at the bottom of the printing cylinder, and cooperate with the printing screen to complete the final deposition of the slurry on the carrier. Therefore, by relying on such a device to replace The printing is completed by the scraper, which can avoid the repeated adjustment of the printing parameters corresponding to the scraper and reduce the complexity of printing. At the same time, the device places the slurry in the printing cylinder, which can better protect the slurry from the influence of the external environment and avoid the problem of screen clogging caused by the volatilization of organic components in the slurry. More importantly, the device uses an air pump as the discharge power source, and cooperates with the movement of the printing cylinder up and down, which can not only control the ink output well, but also reduce the time of single-piece printing to a great extent, and can greatly increase production capacity. Then, the device is used to complete screen printing, which can significantly control the use of slurry, reduce production costs, reduce tedious steps in the printing process, and greatly increase the metallization capacity of solar cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the state when the printing cylinder of the printing device in this embodiment is not lifted;

[0022] Figure 2 This is a schematic diagram of the state in which the printing cylinder of the printing device in this embodiment is lifted;

[0023] Figure 3 This is a schematic diagram of the structure of the printing cylinder in this embodiment without the stirring device after the printing cylinder is cut open;

[0024] Figure 4 This is a schematic diagram of the structure of the printing cylinder including the stirring device after being cut open in this embodiment;

[0025] Figure 5 It is a schematic diagram of the structure of the driving component installed in the printing device in this embodiment.

[0026] Description of labels:

[0027] 1. Printing device; 10. Printing screen; 11. Longitudinal edge; 12. Through hole; 20. Screen frame; 21. First lug structure; 22. Pin hole; 30. Printing cylinder; 31. Bottom plate; 311. Leakage hole; 32. Cover; 33. Inlet; 34. Sealing cover; 35. Second lug structure; 40. Air pump; 50. Driving member; 60. Fixing structure; 61. Pin shaft; 70. Sealing strip; 80. Stirring member. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] The present application embodiment provides a printing device, please refer to Figures 1 - 3 As shown, the printing device 1 includes: a printing screen 10, a screen frame 20, a printing cylinder 30 and an air pump 40, the screen frame 20 is above the printing screen 10, and the outside of the screen frame 20 has a fixing structure 60, and the fixing structure 60 is used to position and fix the printing screen 10; the printing cylinder 30 is used to store slurry, and the printing cylinder 30 is movably arranged in the screen frame 20 up and down, and a plurality of leakage holes 311 are arranged at the bottom of the printing cylinder 30; the air pump 40 is arranged on the printing cylinder 30, and is used to apply positive pressure to the inside of the printing cylinder 30, so that the slurry flows into the printing screen 10 through the leakage holes 311; wherein, when the printing cylinder 30 moves upward and downward, the outer wall of the printing cylinder 30 and the inner wall of the screen frame 20 are always kept in a sealed state.

[0030] In this embodiment, the function of the screen frame 20 is to assist in fixing the printing screen 10. The printing cylinder 30 is movably arranged in the screen frame 20. The movement track of the printing cylinder 30 and the position of the printing screen 10 are limited by the screen frame 20. By lifting the printing cylinder 30, the slurry flows out and fills the space formed by the bottom of the printing screen 10, the screen frame 20 and the printing cylinder 30. Subsequently, the printing cylinder 30 makes a certain downward displacement relative to the screen frame 20 to extrude the slurry, so that the slurry adheres to the surface of the carrier through the preset pattern on the printing screen 10. The air pump 40 is used to provide a certain release pressure for the slurry inside the printing cylinder 30, so that the slurry can leak out better from the leakage holes 311 at the bottom of the printing cylinder 30. Such a device is used to replace the conventional screen printing machine, reduce the input cost of auxiliary materials such as scrapers, greatly reduce the complexity caused by printing parameters, and improve the overall production capacity of the preparation of metallized grid electrodes; at the same time, the slurry is placed in the printing cylinder 30, which can better protect the slurry from the influence of the external environment and avoid the problem of screen blockage caused by the volatilization of the organic components of the slurry. More importantly, through the above printing device to complete the preparation of the electrode, the ink output of the slurry can be better controlled, the possibility of silver paste loss accidents can be reduced, so as to reduce the silver consumption in the printing production process, and at the same time reduce the incidence of abnormal grid conditions, such as broken grids and ghost printing.

[0031] Please refer to Figures 1 - 3 As shown, in this embodiment, it should be noted that a longitudinal edge 11 is provided on the outer edge of the printing screen 10. A screen frame 20 is provided on the upper surface of the printing screen 10. The screen frame 20 is set to be annular and open at both the upper and lower surfaces. The bottom of the screen frame 20 is closely attached to the upper surface of the printing screen 10, so as to prevent the slurry from leaking out from the gap between the bottom of the screen frame 20 and the surface of the printing screen 10; in addition, the size of the screen frame 20 needs to match the size of the printing screen 10, so that it can be placed inside the printing screen 10. Therefore, a first gap is left between the outer wall of the screen frame 20 and the inner wall of the printing screen 10, that is, the inner side of the longitudinal edge 11. Preferably, the first gap is greater than 0 mm and less than 50 mm, such as 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, etc.

[0032] In some embodiments, since the bottom of the screen frame 20 is closely attached to the printing screen 10, the fixing structure 60 can be used to maintain the close attachment state between the two. The fixing structure 60 includes a pin shaft 61. A through hole 12 is provided on the longitudinal edge 11 of the printing screen 10, and a pin hole 22 corresponding to the through hole 12 is provided on the outer wall of the screen frame 20. The pin shaft 61 extends into the pin hole 22 through the through hole 12 to fix and position the printing screen 10 and the screen frame 20. Thus, the printing screen 10 and the screen frame 20 are kept in a relatively fixed position, which is convenient for printing. Of course, other methods can also be used to fix and position the screen frame 20 and the printing screen 10, and other fixing methods are not limited.

[0033] In some embodiments, the outer wall size of the printing cylinder 30 is close to the inner wall size of the screen frame 20, and a second gap is left between the two. The second gap is set to be greater than 0 mm and less than 10 mm, such as 2 mm, 4 mm, 5 mm, 6 mm, 8 mm, etc. By reserving the second gap, it is convenient for the printing cylinder 30 to be placed in the screen frame 20 and move up and down at the same time. When the printing cylinder 30 is lifted for discharging, the slurry fills the space formed by the upper surface of the printing screen 10, the inner wall of the screen frame 20, and the bottom of the printing cylinder 30. At this time, due to the existence of the second gap, the slurry cannot reach a sealed state. Therefore, a sealing rubber strip 70 is provided between the outer wall of the printing cylinder 30 and the inner wall of the screen frame 20. The inner side of the sealing rubber strip 70 is closely attached to and fixed to the outer wall of the printing cylinder 30 without relative displacement, and the outer side of the sealing rubber strip 70 is closely attached to the inner wall of the screen frame 20, ensuring that when the printing cylinder 30 and the screen frame 20 make relative displacement, the slurry in the space formed by the upper surface of the printing screen 10, the inner wall of the screen frame 20, and the bottom of the printing cylinder 30 will not leak from the second gap between the printing cylinder 30 and the screen frame 20.

[0034] It should also be noted that since the bottom of the screen frame 20 is closely attached to the upper surface of the printing screen 10, the position of the upper surface of the printing screen 10 is the lower limit of the movement of the printing cylinder 30, that is, the printing cylinder 30 will not be lower than the lower limit of the movement during the movement process, and the upper limit of the movement of the printing cylinder 30 is lower than the height of the screen frame 20; among them, the upper surface of the printing screen 10 is the initial position of the movement of the printing cylinder 30.

[0035] Please refer to Figure 3 and Figure 4As shown, in this embodiment, it should also be noted that the printing cylinder 30 can adopt various shapes, and preferably a cylindrical shape. The bottom of the printing cylinder 30 is composed of a bottom plate 31, and a plurality of material leakage holes 311 are provided on the bottom plate 31. The shape of the material leakage holes 311 can be any figure. The specific design concept is to enable the slurry to leak out better. The size of the material leakage holes 311 is comprehensively designed according to requirements such as the characteristics of the slurry, the setting of printing parameters, the size of the silicon wafer, the height and width of the grid lines, etc. The bottom plate 31 is designed with material leakage holes 311 of different densities, shapes and sizes, aiming to enable different slurries to leak out smoothly from the material leakage holes 311 under the action of internal air pressure. Thus, the bottom plate 31 with material leakage holes 311 of different densities, shapes and sizes can be replaced, or material leakage holes 311 of different densities, shapes and sizes can be set on the bottom plate 31 according to requirements. How to set it specifically is not specifically limited in the embodiments of the present application. The top of the printing cylinder 30 is composed of a cover 32, and the cover 32 is used to form a closed space inside the printing cylinder 30 to prevent the slurry from being contaminated. An injection port 33 is provided on the cover 32, and the injection port 33 is used to inject the slurry into the printing cylinder 30. To ensure the sealing performance inside the printing cylinder 30, the injection port 33 is also equipped with a sealing cover 34 for sealing. In addition, the slurry can also be replenished into the printing cylinder 30 by connecting a conduit to the injection port 33 and setting a one-way valve on the conduit, reducing the time for the slurry to contact the air.

[0036] In some embodiments, an air pump 40 is provided on the cover 32. The air pump 40 is used to blow gas into the printing cylinder 30 to provide a release pressure for the slurry in the printing cylinder 30, so that the slurry in the printing cylinder 30 flows out from the lower material leakage holes 311. Therefore, the design of the air pump 40 needs to be able to apply pressure evenly within a certain range, so as to ensure that the ink leakage performance of the material leakage holes 311 in different areas at the bottom of the printing cylinder 30 is consistent, and better ensure the uniformity of ink leakage. In addition, the flow rate and the outflow volume of the slurry can also be adjusted by adjusting the amount of gas blown by the air pump 40. The air pump 40 in the present application can be an independent air pump device or a device linked with the printing machine. The air source of the air pump 40 can be air, but other gases need to be selected according to the actual situation to ensure the cleanliness of the slurry and the cleanliness of the entire device, including but not limited to gases such as nitrogen. Preferably, the air pump 40 is provided at the center of the cover 32, so that the slurry in the printing cylinder 30 is evenly pressurized.

[0037] Please refer to Figures 3 - 5As shown, in this embodiment, it should also be noted that the printing device 1 further includes a driving member 50. The driving member 50 is used to lift the printing cylinder 30 upward or retract it downward. By controlling the lifting height of the printing cylinder 30, the amount of slurry flowing into the printing screen 10 is controlled. Since when the printing cylinder 30 is not lifted, the bottom plate 31 of the printing cylinder 30 is in close contact with the printing screen 10, and after the driving member 50 lifts the printing cylinder 30, due to the action of the air pump 40, the slurry flows out from the printing cylinder 30 through the leakage holes 311 onto the printing screen 10. Therefore, the height to which the printing cylinder 30 is lifted determines the volume between the printing screen 10, the screen frame 20, and the bottom of the printing cylinder 30, and thus determines the amount of slurry flowing out. When the driving member 50 pulls the printing cylinder 30 downward, the bottom plate 31 squeezes out the slurry in the above space through the preset pattern on the lower printing screen 10 and adheres it to the carrier. The remaining slurry in the space will be replenished in the next cycle, and the above actions are repeated to complete the printing process. During the downward pull, due to the positive pressure of the air pump 40, the slurry will not flow back into the printing cylinder 30 through the leakage holes 311. In this application, after the driving member 50 lifts the printing cylinder 30 to a certain height, the downward pull can be until the bottom plate 31 of the printing cylinder 30 touches the printing screen 10, or it can be pulled downward to a certain height from the printing screen 10. The specific lifting height or downward pull degree can be set according to the specific situation, and the height difference between the upward and downward movements determines the amount of slurry squeezed out. Therefore, in this application, the slurry is extruded from the printing screen 10 by using the driving member 50 to lift and retract the printing cylinder 30 upward and downward to achieve printing, replacing the conventional screen printing mode in which a squeegee presses a sufficient amount of slurry laid on the screen under a certain pressure through a certain movement path, causing the slurry to pass through the preset pattern on the screen, and finally leaving the corresponding pattern of metal slurry on the surface of the carrier, that is, obtaining the metal grid line solution. And since the bottom of the screen frame 20 is in close contact with the surface of the printing screen 10, the outer wall of the screen frame 20 and the inner wall of the printing cylinder 30 always remain in a sealed state, and the top of the printing cylinder 30 has a cover 32 to isolate the printing cylinder 30 from the outside world. Thus, during the entire printing process, the slurry is in a sealed state and will not be contaminated. At the same time, it also avoids the phenomenon that the organic components of the slurry are prone to volatilization when the slurry is exposed to the air environment on the printing screen 10 for a long time, resulting in the slurry clogging the screen and causing broken grids.

[0038] In some embodiments, two or more first lug structures 21 are symmetrically distributed in the circumferential direction on the outer wall of the screen frame 20; a second lug structure 35 corresponding to the first lug structure 21 is provided on the outer wall of the printing cylinder 30, and the second lug structure 35 is directly above the first lug structure 21; a driving member 50 is disposed between the first lug structure 21 and the second lug structure 35 and is used to drive the printing cylinder 30 to move relative to the screen frame 20 in the vertical direction. Preferably, the driving member 50 here can be an oil cylinder or an electric push rod or other power-generating devices.

[0039] Please refer to Figure 1 and Figure 4 As shown, in this embodiment, it should also be noted that the printing device 1 further includes a stirring member 80. The stirring member 80 is disposed inside the printing cylinder 30 and is used to stir the slurry inside the printing cylinder 30. By the stirring member 80 disposed inside the printing cylinder 30, such as a propeller-type stirring device, the slurry is stirred to keep the slurry in a good solid-liquid homogeneous paste state, so that it can leak out more uniformly from the leakage holes 311 at the bottom of the printing cylinder 30 and cooperate with the printing screen 10 to complete the final deposition of the slurry on the carrier. The stirring member 80 in this application can be an independent stirring device or a stirring device linked with the air pump 40. For example, when the stirring member 80 is an independent stirring device, a motor can be added separately at the top of the printing cylinder 30. A connecting shaft is connected between the output shaft of the motor and the stirring member 80, and then the motor can drive the stirring member 80 to stir through the connecting shaft; the stirring member 80 can also be driven by the air pump 40. Generally, a rotating member is provided inside the air pump 40, and the kinetic energy of the rotating member can be transmitted out through a shaft or a gear for utilization. For example, the rotating member is connected to the stirring member 80 through a connecting shaft to drive the stirring member 80 to stir. Most of the rotating members inside the air pump 40 are rotating blades to realize the input of gas. The rotating blades can be integrally connected with a connecting shaft, and the stirring member 80 is connected to the connecting shaft provided by the air pump 40. Then the air pump 40 can also drive the stirring member 80 to rotate through the connecting shaft, realizing the utilization of kinetic energy. At the same time, the number of components of the printing device 1 can be reduced. Using the existing air pump 40 to drive the stirring member 80 can reduce the cost of the printing device 1.

[0040] In this application, the air pump 40 and the stirring member 80 can also be adjusted by setting a control device. For example, according to the consistency of the slurry, the air intake of the air pump 40 and the rotation speed of the stirring member 80 are controlled. Specifically, the thicker the slurry, the greater the stirring speed and the greater the air intake of the air pump 40. The height difference of the lifting and lowering of the printing cylinder 30 and the air intake of the air pump 40 can also be controlled according to the amount of slurry required for each printing. Of course, the air pump 40, the stirring member 80, and the printing cylinder 30 can also be controlled by comprehensively considering the consistency of the slurry and the amount of slurry used each time to achieve intelligent printing.

[0041] Implementation principle of this embodiment: The printing device includes key components such as a printing screen 10, a screen frame 20, a printing cylinder 30, and an air pump 40. The function of these components is to enable substances such as slurry placed in a certain closed space to leak out smoothly by using air pressure in combination with mechanical movement to apply extrusion. The specific mechanical movement is that the printing screen 10 is fixed on the screen frame 20. When the driving member 50 controls the printing cylinder 30 to move upward by a certain displacement relative to the screen frame 20 from the zero position, the slurry uniformly overflows from the material leakage hole 311 at the bottom of the printing cylinder 30 under the cooperation of the air pump 40 and the stirring member 80 such as a propeller-type stirring device, and fills the space formed by the bottom of the printing cylinder 30, the inner wall of the screen frame 20, and above the printing screen 10. Subsequently, the driving member 50 controls the printing cylinder 30 to move downward by a certain displacement relative to the screen frame 20, so that the slurry adheres to the surface of the carrier through the preset pattern on the printing screen 10. Here, the bottom surface of the printing cylinder 30 replaces the traditional squeegee structure. Although there is a material leakage hole 311 for slurry leakage at the bottom of the printing cylinder 30, under the condition of the internal positive pressure given by the air pump 40, the slurry will not flow back into the printing cylinder 30. More specifically, the size of the above space is determined by the upward movement position of the printing cylinder 30. At the same time, the positive internal pressure of the printing cylinder 30 will change when the printing cylinder 30 moves upward, so that the slurry can be timely filled into the formed above space. At the same time, due to the existence of the sealing strip 70, the slurry can only be uniformly filled in the above space until the printing cylinder 30 moves downward, and the slurry in the above space is extruded through the preset pattern on the lower printing screen 10 and adheres to the carrier. The remaining slurry in the space will be replenished in the next cycle. Repeat the above actions to complete the printing process.

[0042] On the other hand, the present application also provides a printing method and the application of this printing method in the production process of metal grid lines of solar panels. The above printing device is used in this printing method.

[0043] Specifically, the method steps of printing using the printing device of the present application include (some orders can be adjusted):

[0044] S1. Place the screen frame 20 on the printing screen 10, adjust the position between the two to align the pin holes 22 on the screen frame 20 with the through holes 12 on the longitudinal plate edge 11 of the printing screen 10, and then insert a pin shaft 61 between the pin holes 22 and the through holes 12.

[0045] S2. Place the printing cylinder 30 in the screen frame 20 and adjust the relative position of the printing cylinder 30 according to the type of driving device adopted. For example, when the technical solution of directly setting the driving member 50 on the printing device 1 is adopted, it is necessary to adjust the position of the printing cylinder 30 so that the second lug structure 35 provided on the outer wall of the printing cylinder 30 corresponds to the first lug structure 21 on the screen frame 20, and the driving member 50 is arranged between the first lug structure 21 and the second lug structure 35.

[0046] S3. Determine the method of adding the slurry into the printing cylinder 30 according to the structure of the printing cylinder 30. For example, inject the slurry into the printing cylinder 30 through the injection port 33 on the cover 32 of the printing cylinder 30.

[0047] S4. Turn on the air pump 40 or turn on the air pump 40 and the stirring member 80 to apply pressure or apply pressure and stir the slurry.

[0048] S5. Turn on the driving member 50 to perform printing.

[0049] During the assembly process of the above printing device 1, when it is necessary to set the sealant strip 70 or other accessory facilities, the operation can be carried out in appropriate steps.

[0050] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A printing device, characterized in that: The printing device (1) comprises: Printing screen (10); A screen frame (20), the screen frame (20) being placed on the printing screen (10), and the outside of the screen frame (20) having a fixing structure (60), the fixing structure (60) being used to position and fix the printing screen (10); A printing cylinder (30), the printing cylinder (30) is used to store slurry, and the printing cylinder (30) is movably arranged in the screen frame (20) up and down, and the bottom of the printing cylinder (30) has a plurality of material leakage holes (311); an air pump (40), the air pump (40) being arranged on the printing cylinder (30) and being used for applying positive pressure to the interior of the printing cylinder (30) so that the slurry is filled into the printing screen (10) through the leakage holes (311); Wherein, during the upward and downward movement of the printing cylinder (30), the outer wall of the printing cylinder (30) and the inner wall of the screen frame (20) are always kept in a sealed state.

2. The printing device according to claim 1, characterized in that The printing device (1) further comprises a driving member (50); The driving member (50) is arranged outside the screen frame (20) and is used to control the printing cylinder (30) to be lifted or lowered in the screen frame (20).

3. The printing device according to claim 2, characterized in that The outer wall of the screen frame (20) has two or more first lug structures (21) symmetrically arranged along the circumferential direction; The outer wall of the printing cylinder (30) is provided with a second lug structure (35) corresponding to the first lug structure (21); The driving member (50) is arranged between the first lug structure (21) and the second lug structure (35), and is used to drive the printing cylinder (30) to move in a vertical direction relative to the screen frame (20).

4. The printing device according to any one of claims 1 to 3, characterized in that: The bottom of the screen frame (20) is tightly fitted to the surface of the printing screen (10); A first gap is left between the outer wall of the screen frame (20) and the inner wall of the printing screen (10); Preferably, the first gap ranges from 0 mm to 50 mm.

5. The printing device according to claim 4, characterized in that The lower limit of movement of the printing cylinder (30) is the upper surface of the printing screen (10); The upper limit of movement of the printing cylinder (30) is lower than the height of the screen frame (20); The upper surface of the printing screen (10) is the initial position of the movement of the printing cylinder (30).

6. The printing device according to any one of claims 1 to 3, characterized in that: A second gap is left between the outer wall of the printing cylinder (30) and the inner wall of the screen frame (20); A sealing strip (70) is arranged around the outer wall of the printing cylinder (30), and the outer side of the sealing strip (70) is tightly attached to the inner wall of the screen frame (20); Preferably, the second gap ranges from 0 mm to 10 mm.

7. The printing device according to any one of claims 1 to 3, characterized in that: The printing device (1) further comprises a stirring member (80), wherein the stirring member (80) is arranged in the printing cylinder (30) and is used to stir the slurry in the printing cylinder (30).

8. The printing device according to claim 7, characterized in that: The air pump (40) is arranged at the exact center of the top of the printing cylinder (30), and the internal rotating member is connected to the stirring member (80) via a connecting shaft to drive the stirring member (80) to stir.

9. The printing device according to claim 1, characterized in that: The fixing structure (60) comprises a pin (61); The outer wall of the screen frame (20) is provided with a pin hole (22); A through hole (12) corresponding to the pin hole (22) is provided on the outer wall of the printing screen (10); The pin shaft (61) extends into the pin hole (22) through the through hole (12), thereby fixing and positioning the printing screen (10) and the screen frame (20).

10. A printing method, characterized in that: Printing is performed using a printing device (1) as described in any one of claims 1 to 9.

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