A packaging paperboard rapid printing device and printing process

Abstract

The application discloses the technical field of paperboard printing and relates to a packaging paperboard rapid printing device and printing process, which aims at solving the problem of slow silk screen printing overall process and low production efficiency caused by the silk screen printing register action in the prior art. A plurality of workbenches are arranged, each of the workbenches is provided with a first opening and a second opening, a first guide plate is arranged on the periphery of the bottom of the first opening, and the second opening is used for discharging the paperboard after printing downwards; a printing mechanism comprises a silk screen printing plate; a transfer mechanism comprises a transfer part and a lifting part, the transfer part can be used for driving the lifting part to convey, and the lifting part comprises a lifting bearing table. The application is used for the assembly line printing work of the hard paperboard, does not need to repeatedly register the paperboard, can effectively save the waiting time of the printing screen plate, helps to improve the printing speed, can improve the printing position accuracy while ensuring the efficient production.

Description

Technical Field

[0001] This invention relates to a rapid printing device and printing process for packaging paperboard, belonging to the field of paperboard printing technology. Background Technology

[0002] Packaging cardboard, due to its thickness and surface roughness, is unsuitable for roller printing and is instead printed using screen printing. When printing color patterns in CMYK mode, the relative position between the printing screen and the substrate (i.e., registration) needs to be adjusted before printing to avoid color differences caused by inaccurate printing positions. In continuous high-speed production, to ensure that the cardboard being printed moves accurately to the corresponding printing screen position on the production line, two methods are usually used to assist the cardboard in moving to a relatively accurate position. One is to use continuous roller conveying after the initial registration to prevent it from being stuck on the conveyor belt. One method involves reducing the positional deviation of the cardboard after movement. Another method utilizes the negative pressure adsorption on the conveyor belt to ensure that the cardboard adheres to the surface of the conveyor belt, thus minimizing the positional deviation from the ideal printing position. Both methods use a conveyor belt to reduce the ideal positional deviation after the cardboard is displaced, thereby achieving the technical effect of high-speed printing. However, these methods can only reduce the positional deviation of the cardboard and cannot completely eliminate it. After a deviation occurs, the cardboard may still need to be re-registered to ensure the printing effect. This seriously delays the production process and is not conducive to the rapid printing of a large number of cardboard products. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a rapid printing device and printing process for packaging cardboard, which is used for the production line printing of cardboard. It eliminates the need for repeated registration of the cardboard, effectively saves the waiting time of the printing screen, helps to improve the printing speed, and can improve the accuracy of the printing position while ensuring efficient production.

[0004] To achieve the above objectives, the present invention employs the following technical solution:

[0005] On one hand, the present invention provides a rapid printing apparatus for packaging paperboard, comprising:

[0006] Several worktables are provided, each of which is provided with a first opening and a second opening. A first guide plate is provided on the periphery of the bottom of the first opening. The first guide plate is used to guide and position the paperboard to be printed stacked at the feeding position toward the surface of the opening. The second opening is used to feed the printed paperboard downwards.

[0007] Printing mechanism, the printing mechanism includes a silk screen plate, and the silk screen plate can move above the first opening and print the cardboard located at the position of the first opening;

[0008] Transfer mechanism, the transfer mechanism includes a transfer part and a lifting part, the transfer part can be used to drive the lifting part to convey between the second opening position of one of the workbenches and the first opening position of the adjacent workbench, and the lifting part includes a liftable carrier for supplying cardboard or receiving stacked cardboard;

[0009] Transfer mechanism, arranged on each workbench, for transferring the printed cardboard located above the first opening to the second opening position for dropping.

[0010] Specifically, the first openings of non-first workbenches are adjacent to the second openings of adjacent workbenches, the transfer mechanism is arranged between the adjacent first opening and second opening, the transfer part includes a rotating table and a first driving mechanism for driving the rotating table to rotate, the rotating table is axially symmetrically arranged, and lifting parts are respectively arranged at the axially symmetric positions at both ends of the rotating table.

[0011] Specifically, the lifting part includes a mounting plate arranged on the rotating table and multiple limiting rods, and the multiple limiting rods are used to enclose a limiting space for receiving cardboard, the carrier is slidably arranged on the mounting plate in the vertical direction, and a second driving mechanism for driving the carrier to lift is further arranged on the mounting plate.

[0012] Specifically, the position of the carrier relative to the first opening or the second opening is partially convexly arranged, and the position height of the convex part is greater than or equal to the depth of the first guide plate.

[0013] Specifically, the transfer mechanism includes a moving module fixedly arranged on the workbench, and the moving module can at least drive its output end to reciprocate between the first opening and the second opening of the workbench, a U-shaped frame is installed at the output end of the moving module, the opening direction of the U-shaped frame is perpendicular to the connection line between the first opening and the second opening of the workbench, and the width on both sides of the U-shaped frame is greater than the width of the first opening.

[0014] Specifically, a "mouth" - shaped second guide plate is arranged below the second opening of the workbench, the second guide plate is used to enclose a limiting space for the cardboard to fall, and an air outlet pipe communicating with the limiting space is arranged on the second guide plate, and the diameter or height of the air inlet of the air outlet pipe is at least greater than the thickness of the cardboard.

[0015] Specifically, a drying mechanism is further included, and the drying unit of the drying mechanism is used to generate ultraviolet rays or hot air acting on the printed cardboard at the second opening position.

[0016] Specifically, when the drying unit is used to generate hot air, the drying mechanism includes:

[0017] A positioning plate is provided, on which a blower pipe is mounted. The positioning plate can be used to adjust the blowing direction of the blower pipe to point towards the printed cardboard at the second opening position. The blower pipe and the air outlet pipe are connected to the same fan. The blower pipe is connected to the air outlet of the fan, and the air outlet pipe is connected to the air inlet of the fan. An electric heating wire for heating the air is provided in the connecting path between the air outlet pipe and the blower pipe.

[0018] On the other hand, the present invention provides a rapid printing process for packaging paperboard, which employs the aforementioned rapid printing device, and the process steps include:

[0019] S1. Supply stacked cardboard to be printed to the workbench and move the stacked cardboard to be printed below the first opening of the workbench;

[0020] S2. Convey the stacked cardboard upwards so that the stacked cardboard can move through the first opening to the upper surface of the workbench;

[0021] S3. The upper surface of the cardboard of the first opening is printed using screen printing.

[0022] S4. The paperboard that has been screen printed is lowered from the second opening position of the workbench, and the support platform at the second opening position receives the material and begins to stack it. At the same time, the paperboard stacked at the first opening position is lifted, and the paperboard is printed one by one by screen printing.

[0023] S5. When there is a shortage of material on the adjacent rear workbench, the transfer mechanism will transport the cardboard that has been stacked on the front workbench to the first opening position of the rear workbench.

[0024] S6. Repeat steps S1-S5 until the stacked cardboard flows out from the second opening of the last workbench.

[0025] Specifically, the steps for receiving materials and starting stacking from the support platform at the second opening include:

[0026] Move the support platform to a position above the inside of the second opening;

[0027] After the printed cardboard is placed down, the support platform is moved down by the thickness of one cardboard. The thickness of the cardboard that is moved down is the estimated thickness of the number of cardboards to be stacked minus the total thickness of the cardboards that have already been stacked.

[0028] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0029] 1. The present invention provides a rapid printing device and printing process for packaging cardboard. The stacked cardboard is supplied from bottom to top by limiting the guide plate on the worktable. The printing cardboard protruding from the surface of the worktable flows away in time after printing and is directly lifted by the cardboard below to continue printing. The feeding method is fast and does not require multiple registrations, which can effectively shorten the waiting time of screen printing registration. Compared with the traditional streamline method, the lifting feeding method has a shorter printing cardboard stroke, which means that the material can be prepared quickly and the waiting time of the printing screen can be shortened, which can help to further improve the printing efficiency of cardboard.

[0030] 2. The present invention provides a rapid printing device and printing process for packaging paperboard. After the screen printing operation is completed, the ink on the surface of the paperboard is dried during the waiting time after the screen printing is completed. This can reduce the occurrence of defects such as color difference caused by ink mixing without affecting the efficiency of the equipment.

[0031] 3. The present invention provides a rapid printing device and printing process for packaging paperboard, which uses air extraction to form a certain balanced negative pressure area below the second opening, so that the paperboard can be quickly and evenly subjected to force and fall onto the support platform from the position of the second opening. At the same time, by simplifying the fan settings, hot air is directly blown out from the air outlet to supply the upper surface of the printed paperboard again, which can quickly dry the surface of the printed product and simplify the mechanism settings. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the rapid printing apparatus provided in an embodiment of the present invention;

[0033] Figure 2 This is the present invention. Figure 1 Enlarged view of the structure at point A of the rapid printing apparatus provided in the embodiment;

[0034] Figure 3 This is a schematic diagram of the overall structure of the transfer mechanism provided in an embodiment of the present invention;

[0035] Figure 4 This is a side view of the rapid printing apparatus provided in an embodiment of the present invention;

[0036] Figure 5 This is the present invention. Figure 4 A cross-sectional view of the rapid printing apparatus provided in the embodiment in the BB direction;

[0037] Figure 6 This is a front view of the rapid printing apparatus provided in an embodiment of the present invention;

[0038] Figure 7 This is the present invention. Figure 6 A cross-sectional view of the rapid printing apparatus provided in the embodiment;

[0039] Reference numerals: 1. Workbench; 101. First guide plate; 102. Second guide plate; 103. Air outlet pipe; 2. Printing mechanism; 3. Transfer mechanism; 31. Transfer section; 3101. Rotary table; 3102. First drive mechanism; 32. Lifting section; 3201. Support platform; 3202. Limiting rod; 3203. Mounting plate; 3204. Second drive mechanism; 4. Transfer mechanism; 401. Moving module; 402. U-shaped frame; 5. Positioning plate; 6. Air outlet pipe. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1:

[0043] This invention provides a rapid printing device for packaging cardboard, used in automated printing operations on cardboard. It eliminates the need for repeated registration of the cardboard, effectively saving waiting time for the printing screen and helping to increase printing speed. It also improves the accuracy of printing position while ensuring efficient production. To achieve the device's structural functions, the device includes the following components:

[0044] Several worktables 1 are provided, each worktable 1 is provided with a first opening and a second opening. A first guide plate 101 is provided on the periphery of the bottom of the first opening. The first guide plate 101 is used to guide and position the paperboard to be printed stacked at the feeding position to the surface of this opening. The size of the first opening can be adapted to the size of the paperboard to be printed, so that the stacked paperboard can be guided and conveyed by the first guide plate 101 and can be located in a relatively accurate printing registration position. The second opening is used to put the printed paperboard downward.

[0045] Printing mechanism 2 is used to screen print on the surface of cardboard, including screen printing screen. The screen printing screen can be moved at least above the first opening and print on the cardboard located at the first opening. The specific driving method is not limited here. For color printing in CMKY mode, it is preferred to have four sets of printing mechanisms. Each set of screen printing screen is used to carry a pigment of a certain color and apply the pigment to the printing surface of the cardboard. By combining different color patterns, a rich color pattern is finally formed.

[0046] Transfer mechanism 3, such as Figure 3 As shown, the transfer mechanism 3 includes a transfer section 31 and a lifting section 32. The transfer section 31 can drive the lifting section 32 to transport materials between the second opening position of one of the worktables 1 and the first opening position of the adjacent worktable 1. Its arrangement position can be referred to Figure 1 As shown, the lifting unit 32 includes a lifting support platform 3201 for supplying cardboard or receiving stacked cardboard. At the first opening position of the worktable 1, the support platform 3201 is used to convey the stacked cardboard upward so that the stacked cardboard can move to the upper surface of the worktable 1 and be printed by the printing mechanism 2. At the second opening position, the same support platform 3201 is provided to receive the cardboard falling from the second opening position. By gradually lowering the cardboard, the drop amplitude is ensured to be not too large, thereby stabilizing the cardboard reception. The cardboard is stacked on the support platform 3201 by continuous descent, waiting for the next printing material supply or the cardboard that has been printed is sent out.

[0047] The transfer mechanism 4 is used to drive the cardboard to be placed at the second opening after printing is completed, so that the cardboard can fall down and be stored normally. The transfer mechanism 4 is set on each worktable 1. The specific method can be driven by a robot or other driving methods, which is not limited here.

[0048] Through the combination of the above-mentioned components, when the device is in use, the front-end transfer mechanism feeds the cardboard, and after the cardboard is transferred to the area below the first opening by the transfer mechanism 3, it is conveyed to the area above the first opening by the lifting action, and then printed by the printing mechanism 2. After printing, the transfer mechanism 4 transfers the printed cardboard, so that the printed cardboard is placed from the position of the first opening into the corresponding second opening, and the bearing platform 3201 below the second opening collects and stacks the printed cardboard. When the cardboard is short of material at the next workstation, the stacked cardboard is conveyed to the first opening position of the next workstation 1. In this way, during the upward movement of the cardboard, the strength of the cardboard itself is used to guide it by the first guide plate 101. The guide allows the conveyed cardboard to be positioned directly at the first opening (automatically limited by the size of the first opening, i.e., a smooth transition between the interior of the first guide plate 101 and the first opening). By setting the cardboard conveying height slightly higher than the surface of the worktable 1, the screen printing process can proceed normally. When using this device, the printing screen does not need to wait for registration in subsequent operations, avoiding the problem of repeatedly adjusting the position of the printing screen or cardboard, which affects production efficiency. In addition, after the cardboard is removed from the first opening, the stacked cardboard can be immediately lifted, allowing the lower cardboard to quickly enter the screen printing step, reducing the waiting time and thus improving the production efficiency of the equipment, which helps to produce quickly and improve the accuracy of pattern printing registration.

[0049] This invention provides a rapid printing apparatus for packaging paperboard, specifically disclosing a transfer mechanism 3 for realizing the transfer of paperboard between two adjacent worktables 1, wherein the first opening of each non-first worktable 1 is adjacent to the second opening of the adjacent worktable 1, such as... Figure 1 As shown, the transfer mechanism 3 is located between adjacent first and second openings. To improve flow efficiency, the transfer section 31 includes a rotating platform 3101 and a first drive mechanism 3102 for driving the rotating platform 3101 to rotate. The rotating platform 3101 is arranged symmetrically along an axis, as shown below. Figure 3As shown, lifting parts 32 are respectively provided at the axisymmetrical positions at both ends of the rotary table 3101. Through this axisymmetrical design, when the rotary table 3101 rotates, taking a 180° rotation as an example, the lifting part 32 located at one of the second opening positions can move to the bottom position of the first opening of the adjacent worktable 1 after rotating 180°, and the position is interchanged with the lifting part 32 at the bottom position of the original first opening. It can automatically move the empty carrier table 3201 to the stacking position and transport the stacked printing paperboard to the bottom of the first opening to wait for the next printing step. This flow method is simple in operation and easy in setting up the mechanism. There is no need to prepare an excessively long flow line to transport the paperboard one by one. The coordination between the various mechanism components is good, and it is possible to troubleshoot the local problem after a local problem occurs without affecting the normal operation of other parts.

[0050] This invention provides a rapid printing device for packaging cardboard, specifically offering a lifting mechanism for a lifting unit 32 to accommodate the irregular structure of a worktable 1. Specifically, the lifting unit 32 includes a mounting plate 3203 mounted on a rotary table 3101 and multiple limiting rods 3202. These limiting rods 3202 form a limiting space for storing the cardboard, preventing the cardboard from drifting elsewhere after falling from the second opening and causing misalignment in the stacking position. The support platform 3201 is slidably mounted vertically on the mounting plate 3203. The mounting plate 3203 also has a second driving mechanism 3204 for driving the lifting of the support platform 3201. Figure 3 As shown, the second drive mechanism 3204 can drive the lifting and lowering of the support platform 3201 by rotating a lead screw driven by a motor. Other embodiments are not limited here. When lifting the support platform 3201 upward, considering that the actual lifting distance is the thickness of a cardboard, although the motor rotation distance can be controlled by an encoder, considering that the actual thickness of the cardboard stack may have deviations, it is preferable to set a limit sensor or photoelectric sensor (not shown in the figure) on the worktable 1. After the cardboard is lifted to the position of the limit sensor, the motor transmission can be stopped. In order to ensure that each cardboard can pass through the first guide plate 101 and be supplied above the worktable 1, the support platform 3201 needs to be set in a protruding shape relative to the position of the first opening or the second opening. That is, the protruding part can pass through the middle position of the first guide plate 101 and transport the cardboard it carries upward. At this time, the height of the protruding part needs to be greater than or equal to the depth of the first guide plate 101. When printing on the cardboard, the upper surface of the cardboard to be printed should be higher than the upper surface of the worktable 1 so that the screen printing ink can be accurately applied to the position of the cardboard.

[0051] A rapid printing device for packaging cardboard provided by an embodiment of the present invention specifically provides a transfer mechanism 4 for moving the printed cardboard from the first opening position to the second opening position. Considering that the control method of using a manipulator is complex and the usage cost is relatively high, the transfer mechanism 4 is provided here to include a moving module 401 fixedly arranged on the workbench 1. As Figure 2 shown, wherein the moving module 401 can at least drive its output end to reciprocate between the first opening and the second opening of the workbench 1. A U-shaped frame 402 is installed at the output end of the moving module 401. The opening direction of the U-shaped frame 402 is perpendicular to the connection line between the first opening and the second opening of the workbench 1. The width of both sides of the U-shaped frame 402 is greater than the width of the first opening. This setting method utilizes the smooth surface of the workbench 1. When driving the cardboard to move, both sides of the U-shaped frame 402 limit both sides of the cardboard. When the topmost cardboard is lifted by the carrier 3201 to a position protruding from the surface of the workbench 1, the U-shaped frame 402 clamps the cardboard and pushes it towards the second opening position, thereby preventing the cardboard from running off and not being able to accurately fall inside the second opening. Considering that when the U-shaped frame 402 returns, the cardboard at the first opening position has been lifted. The carrier 3201 can be controlled to descend by a certain amplitude so that the U-shaped frame 402 can move to the first opening position to clamp the material, or the moving module 401 can also be set to further include a vertical driving part for lifting the U-shaped frame 402 to avoid the cardboard first and then clamping the cardboard after the U-shaped frame 402 drops, and then driving it to move to the second opening position again. This action method is simple in setting, low in control cost, and small in structure, facilitating the automatic pushing of the cardboard to complete continuous printing operations. In order to prevent the cardboard from shifting in the non-moving direction, the U-shaped frame 402 can also be set in a "square" shape, and other specific setting methods are not limited here.

[0052] A rapid printing device for packaging cardboard provided by an embodiment of the present invention, in order to enable the cardboard to be stacked quickly and stably. First, a "square" - shaped second guide plate 102 is provided below the second opening of the workbench 1. The second guide plate 102 is used to enclose a limiting space for the cardboard to fall, avoiding a large - scale position shift of the cardboard. In order to prevent the cardboard from being blocked from descending due to the air flow resistance, an air outlet pipe 103 communicating with the limiting space can be provided on the second guide plate 102. As Figure 5As shown, the diameter or height of the air inlet of the air outlet 103 is at least greater than the thickness of the cardboard. With this arrangement, after the cardboard moves to the position of the second opening, it is quickly and stably drawn into a negative pressure chamber by the air outlet 103 within the limited space where the cardboard falls. This allows the cardboard to fall quickly from the surface position of the second opening with less wind resistance. The uniform negative pressure adsorption also prevents the cardboard from tilting, which is beneficial for accurate stacking of the cardboard. By setting the diameter or height of the air outlet to be greater than the thickness of the cardboard, the cardboard can still form a natural adsorption air chamber after falling, avoiding excessive negative pressure that could cause the cardboard to tilt. After the cardboard is stacked, the corresponding support platform 3201 moves downward by the thickness of one cardboard, thereby ensuring that the falling position of the stack does not change significantly and maintaining the normal negative pressure position of the air outlet 103.

[0053] This invention provides a rapid printing apparatus for packaging paperboard. To quickly dry the printed paperboard, the apparatus includes a drying mechanism. Specifically, the drying unit of the drying mechanism generates ultraviolet light or hot air to act on the printed paperboard at the second opening. When the drying unit generates hot air, the drying mechanism includes:

[0054] Positioning plate 5, on which a blower pipe 6 is installed, such as Figure 2 As shown, the positioning plate 5 can be used to adjust the blowing direction of the air blower 6 towards the printing paperboard at the second opening position. The specific positioning or adjustment method is not limited here. The air blower 6 and the air outlet 103 are connected to the same fan (fan not shown). The air blower 6 is connected to the air outlet of the fan, and the air outlet 103 is connected to the air inlet of the fan. In this way, the air pressure requirements of two workstations can be met using the same fan, simplifying the mechanism setup and saving equipment costs. To improve drying performance, a heating wire for heating the air is installed in the connection between the air outlet 103 and the air blower 6. Hot air is blown out, allowing the printing paperboard to dry quickly. In this method, the surface of the printing paperboard can be dried during the waiting time after printing, making full use of the stacking idle time for drying. The automated process has high consistency and can help shorten the operation time. Example 2:

[0055] The present invention provides a rapid printing process for packaging paperboard, employing a rapid printing apparatus according to any one of the embodiments, and the process steps include:

[0056] S1. Supply stacked cardboard to be printed to workbench 1 and transfer the stacked cardboard to be printed to the area below the first opening of workbench 1; the stacking of the printing cardboard on the first workbench can be done manually and transported by the transfer mechanism 3.

[0057] S2. Convey the stacked cardboard upwards so that the stacked cardboard can move to the upper surface of the workbench 1 through the first opening; the first opening is used to automatically limit the printing position of the cardboard. During printing, the conveying position height of the top cardboard is preferably such that the height of the horizontal plane of the workbench 1 is between the top and bottom surfaces of the top cardboard, so that it has a certain protruding height to be printed, and can be limited by the first opening during the printing process to prevent deviation.

[0058] S3. The upper surface of the cardboard of the first opening is printed using screen printing. This includes actions such as driving the printing screen mechanism to approach and move away from the surface of the cardboard. Since the approaching or moving away methods are conventional, they will not be explained in detail here.

[0059] S4. The paperboard that has been screen printed is lowered from the second opening position of the workbench 1. The carrier 3201 at the second opening position receives the material and begins to stack it. That is, the paperboard that has been printed is received and collected. After a certain amount of material is collected, it is conveyed to the printing station at the rear end. At the same time, the paperboard stacked at the first opening position is lifted and the paperboard is printed one by one using the screen printing method.

[0060] S5. When the adjacent rear workbench 1 is short of material, the transfer mechanism 3 transports the cardboard that has been stacked on the front workbench 1 (that is, the cardboard that has been stacked below the second opening position) to the first opening position of the rear workbench 1. At the same time, the symmetrically designed empty carrier 3201 moves to the lower part of the second opening of the front workbench 1 and waits for the stacking action to be carried out in preparation for the next material supply.

[0061] S6. Repeat steps S1-S5 until the stacked cardboard flows out from the second opening of the last workbench 1. The cardboard at this outlet can be handled manually or by other means to obtain cardboard that has been finished with color printing.

[0062] The rapid printing process for packaging paperboard provided in this embodiment of the invention includes the following steps: receiving material from the carrier platform 3201 at the second opening position and starting stacking.

[0063] Move the support platform 3201 to the upper position inside the second opening;

[0064] After the printed cardboard is placed down, the support platform 3201 is moved downwards by the thickness of one cardboard. This ensures that subsequent cardboards fall at a relatively stable height. To avoid slight deviations in the thickness of individual cardboards, the thickness of the cardboard that is moved down can be defined as the estimated thickness of the number of cardboards to be stacked minus the total thickness of the already stacked cardboards. During the cardboard's descent, as shown in part of the embodiment, air can be drawn in to reduce air resistance, thus preventing the cardboard from tilting due to excessive air resistance. When performing this step, the height of the top surface of the stacked cardboards should be controlled to be no higher than the top surface of the air outlet of the air duct 103.

[0065] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A rapid printing device for packaging paperboard, characterized in that, include: A plurality of workbenches (1), each of the workbenches (1) is provided with a first opening and a second opening, a first guide plate (101) is provided on the periphery of the bottom of the first opening, the first guide plate (101) is used to guide and position the paperboard to be printed stacked at the feeding position to the surface of the opening, and the second opening is used to feed the paperboard that has been printed downwards. The printing mechanism (2) includes a screen printing plate that can be moved above the first opening and print on the cardboard located at the first opening. The transfer mechanism (3) includes a transfer part (31) and a lifting part (32). The transfer part (31) can be used to drive the lifting part (32) to transport at the second opening position of one of the worktables (1) and the first opening position of the adjacent worktable (1). The lifting part (32) includes a lifting support platform (3201) for supplying cardboard or receiving stacked cardboard. The transfer mechanism (4) is set on each workbench (1) to transfer the printed paperboard located above the first opening to the second opening position for placement. The first opening of each non-first workbench (1) is adjacent to the second opening of the adjacent workbench (1). The transfer mechanism (3) is located between the adjacent first and second openings. The transfer part (31) includes a rotary table (3101) and a first drive mechanism (3102) for driving the rotary table (3101) to rotate. The rotary table (3101) is arranged axially symmetrically. Lifting parts (32) are respectively provided at the axially symmetrical positions at both ends of the rotary table (3101). The size of the first opening is adapted to the size of the paperboard to be printed, so that the stacked paperboard can be guided and transported by the first guide plate and placed in a relatively accurate printing registration position.

2. The packaging paperboard rapid printing device according to claim 1, characterized in that, The lifting unit (32) includes a mounting plate (3203) on a rotating platform (3101) and multiple limiting rods (3202). The multiple limiting rods (3202) are used to form a limiting space for storing cardboard. The support platform (3201) is slidably mounted on the mounting plate (3203) in the vertical direction. The mounting plate (3203) is also provided with a second driving mechanism (3204) for driving the support platform (3201) to lift.

3. The packaging paperboard rapid printing device according to claim 2, characterized in that, The support platform (3201) is provided in a raised position relative to the first opening or the second opening, and the height of the raised part is greater than or equal to the depth of the first guide plate (101).

4. The packaging paperboard rapid printing device according to claim 1, characterized in that, The transfer mechanism (4) includes a movable module (401) fixedly mounted on the workbench (1). The movable module (401) is capable of driving its output end to reciprocate between the first opening and the second opening of the workbench (1). The output end of the movable module (401) is equipped with a U-shaped frame (402). The opening direction of the U-shaped frame (402) is perpendicular to the line connecting the first opening and the second opening of the workbench (1). The width of both sides of the U-shaped frame (402) is greater than the width of the first opening.

5. The packaging paperboard rapid printing device according to claim 1, characterized in that, Below the second opening of the workbench (1), there is a second guide plate (102) in the shape of a "mouth", and the second guide plate (102) is used to enclose a limiting space for the cardboard to fall. An air outlet pipe (103) communicating with the limiting space is arranged on the second guide plate (102), and the diameter or height of the air inlet of the air outlet pipe (103) is at least greater than the thickness of the cardboard.

6. The packaging paperboard rapid printing device according to claim 5, characterized in that, It further includes a drying mechanism, and the drying unit of the drying mechanism is used to generate ultraviolet rays or hot air acting on the printed cardboard at the second opening position.

7. A rapid printing device for packaging paperboard according to claim 6, characterized in that, When the drying unit is used to generate hot air, the drying mechanism includes: A positioning plate (5), on which a blowing pipe (6) is installed. The positioning plate (5) can be used to adjust the blowing direction of the blowing pipe (6) to point to the printed cardboard at the second opening position. The blowing pipe (6) and the air outlet pipe (103) are connected to the same fan. The blowing pipe (6) is connected to the air outlet of the fan, and the air outlet pipe (103) is connected to the air inlet of the fan. An electric heating wire for heating the air is arranged on the connecting path between the air outlet pipe (103) and the blowing pipe (6).

8. A rapid printing process for packaging paperboard, employing the rapid printing apparatus as described in any one of claims 1-7, characterized in that, The process steps include: S1. Supply the stacked cardboard to be printed to the workbench (1), and transfer the stacked cardboard to be printed to the lower part of the first opening of the workbench (1). S2. Convey the stacked cardboard upward so that the stacked cardboard can move through the first opening to the upper surface of the workbench (1). S3. Complete the printing of the cardboard on the upper surface of the first opening by screen printing. S4. Put down the cardboard that has completed screen printing from the second opening position of the workbench (1), and the receiving platform (3201) at the second opening position receives the material and starts stacking. At the same time, continue to lift the stacked cardboard at the first opening position, and print each cardboard by screen printing one by one. S5. When the rear workbench (1) is out of material, the transfer mechanism (3) conveys the stacked cardboard at the front workbench (1) to the first opening position of the rear workbench (1). S6. Repeat steps S1 - S5 until the stacked cardboard flows out from the second opening position of the last workbench (1).

9. A rapid printing process for packaging paperboard according to claim 8, characterized in that, The step of the receiving platform (3201) at the second opening position receiving the material and starting stacking includes: Move the receiving platform (3201) to the upper position inside the second opening. After putting down the printed cardboard, move the receiving platform (3201) downward by the thickness of one cardboard, where the corresponding thickness of the downward movement is the estimated thickness of the cardboard to be stacked minus the total thickness of the cardboard that has been stacked.

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