A packaging color box surface printing device and method

Abstract

The present application relates to the field of printing device, specifically to a kind of packaging color box surface printing device and method, including conveying structure, conveying structure is equipped with several groups of positioning structure for clamping color box body, the top of conveying structure is equipped with several groups of printing structure, printing structure side is equipped with drying structure, the below of printing structure is equipped with several groups of ramp structure for extruding color box body on moving;Conveying structure moves positioning structure by chain and sprocket, so that color box body sequentially passes printing structure and drying structure, realizes the continuous operation of color box multicolor step printing, is convenient for multilevel overprint to complex graphics and text, compared with manual silk screen printing, without manual operation one by one, substantially improve printing efficiency, meet mass production demand.

Description

Technical Field

[0001] This invention relates to the field of printing apparatus, and more specifically to an apparatus and method for printing on the surface of packaging color boxes. Background Technology

[0002] In the manufacturing of packaging boxes, the basic patterns and text are usually printed on the flat plates of the box first. After the printing is completed, the three-dimensional box is formed through processes such as die cutting, folding, and gluing. With the increasing demand in the market for product anti-counterfeiting, personalized brand display and real-time information updates, after the color box is formed into a box, it is often necessary to print on its surface a second time, such as adding special printing content such as anti-counterfeiting marks, variable QR codes, and promotional information. Currently, the industry mostly uses manual screen printing for secondary printing on the surface of finished color boxes. However, manual screen printing has significant drawbacks. Manual operation relies heavily on the experience and skill of the printing workers, resulting in low printing efficiency and difficulty in meeting the demands of mass production. Furthermore, the instability of manual operation easily leads to quality problems such as misregistration of printed patterns and uneven ink layer thickness. With the continuous rise in labor costs, manual screen printing requires a significant amount of manpower. Therefore, this paper proposes a printing device and method for the surface of packaging color boxes to facilitate secondary printing on the box body, improving printing efficiency and convenience. Summary of the Invention

[0003] To address the problems in the prior art, the present invention provides a packaging box surface printing apparatus and method to facilitate secondary printing on the box body, thereby improving the printing efficiency and convenience of the box body.

[0004] The technical solution adopted by the present invention to solve its technical problem is a packaging color box surface printing device, including a conveying structure, a number of positioning structures for clamping the color box body on the conveying structure, a number of printing structures above the conveying structure, a drying structure on one side of each printing structure, and a number of ramp structures for squeezing the color box body upward below each printing structure.

[0005] Specifically, the positioning structure includes a positioning frame, a horizontally positioned lifting plate inside the positioning frame, several sets of vertically positioned sliding grooves inside the positioning frame, a slider that is slidably connected to the sliding grooves on the outer side of the lifting plate, a horizontally positioned adjusting plate on the upper surface of the lifting plate, a vertically positioned adjusting bolt that is rotatably connected to the adjusting plate, and the lower end of the adjusting bolt passing through the lifting plate and threadedly connected to the lifting plate.

[0006] Two sets of symmetrically arranged first positioning plates are provided above the adjustment plate. A second positioning plate is provided between the two ends of the two sets of first positioning plates. The first and second positioning plates are rotatably connected to the fixing bolts on the side away from the center of the positioning frame. One end of the fixing bolt passes through the positioning frame and is threadedly connected to the positioning frame. A moving groove is provided on the inner side of the positioning frame. A moving block is provided on the end face of the first positioning plate and is slidably connected to the moving groove.

[0007] Specifically, the ramp structure includes a horizontally arranged trapezoidal extrusion plate, a mounting plate below the trapezoidal extrusion plate, a first hydraulic telescopic rod and a compression spring connecting the trapezoidal extrusion plate and the mounting plate, a support member fixedly connected to the lower surface of the mounting plate, and a first support leg fixedly connected to both ends of the support member, and a wedge-shaped extrusion surface on the lower edge of the positioning frame that is in extrusion contact with the trapezoidal extrusion plate.

[0008] Specifically, the printing structure includes a fixed frame set above the trapezoidal extrusion plate, a printing screen set horizontally at the bottom of the inner side of the fixed frame, a vertically set scraper and a spreading plate on the upper surface of the printing screen, and a horizontally set drive rod fixedly connected to the upper surface of the scraper. Both ends of the drive rod are connected to a vertical second hydraulic telescopic rod. The lower end of the second hydraulic telescopic rod is connected to a slide block. The two sets of slide blocks are connected to the material spreading plate by brackets. The positioning frame is provided with horizontally set positioning grooves on both sides near the slide block. A positioning block that is slidably connected to the positioning groove is provided on one side of the slide block. The first hydraulic telescopic rod is connected to the inside of the second hydraulic telescopic rod through a pipeline.

[0009] Specifically, a first horizontal bar is provided on one side of the fixed frame, and a cylinder is connected between the slide and the first horizontal bar. A second horizontal bar is provided on the side of the fixed frame away from the first horizontal bar, and a connecting rod is fixedly connected between the fixed frame and the second horizontal bar. Several sets of vertically arranged second legs are fixedly connected to the lower surfaces of both the first and second horizontal bars.

[0010] Specifically, both the first and second positioning plates have slots on the side away from the fixing bolts, and a pressing block is slidably connected in the slot. A return spring is fixedly connected between the pressing block and the slot. A pneumatic telescopic rod is connected between the slider and the bottom of the slide groove. Both the first and second positioning plates have joints connected to the slots on the side away from the pressing block. The fixed end of the pneumatic telescopic rod is connected to the joint through a pipeline.

[0011] Specifically, the drying structure includes an electric heating plate horizontally set on one side of the fixed frame, and the first and second crossbars are fixedly connected to one side of the electric heating plate through a support plate.

[0012] Specifically, the conveying structure includes two sets of symmetrically arranged chains, with sprockets meshing and driving on the inner side of the chains. Fixed rods and elastic rods are fixedly connected to both sides of the positioning frame, and the ends of the fixed rods and elastic rods away from the positioning frame are fixedly connected to one side of the chain. The side of the sprocket away from the positioning frame is rotatably connected to a vertically arranged bracket, and a drive motor for driving the sprocket to rotate is provided on one side of the bracket.

[0013] A method for printing on the surface of a packaging color box, using the aforementioned packaging color box surface printing apparatus, specifically includes the following steps: S1. Adjust the positioning structure and place the color box body into the positioning structure; S2. The conveying structure drives the positioning structure to move, and after moving the color box body to the top of the ramp structure, it stops, and the ramp structure lifts the color box. S3. The printing structure prints on the raised color box body; S4. After the color box body is printed, the conveying structure drives the positioning structure to move, moving the color box to the bottom of the drying structure for drying, completing one layer of printing. S5. Repeat steps S2 to S4 to complete the multi-layer overprinting on the surface of the color box.

[0014] The beneficial effects of this invention are: The present invention discloses a packaging color box surface printing device and method, in which the conveying structure drives the positioning structure to move through the chain and sprocket, so that the color box body passes through the printing structure and the drying structure in sequence, realizing the continuous operation of multi-color level printing of color boxes, which is convenient for multi-layer overprinting of complex graphics and text. Compared with manual screen printing, it eliminates the need for manual operation one by one, greatly improving printing efficiency and meeting the needs of mass production.

[0015] The packaging box surface printing device and method of the present invention, during the movement of the positioning frame, is connected by the pipeline of the first hydraulic telescopic rod and the second hydraulic telescopic rod, so that when the squeegee moves up after printing, the spreading plate simultaneously spreads ink on the printing screen, thus overlapping the spreading time with the conveying time, further shortening the single printing cycle and improving production efficiency.

[0016] The present invention discloses a packaging color box surface printing device and method. When the lifting plate moves up, the slider squeezes the pneumatic telescopic rod. The gas pushes the squeezing block out through the pipeline and closely fits the side of the color box to form a multi-point clamping. This not only fixes the color box body, but also offsets part of the lateral force during printing, avoids deformation of the box body due to uneven force, and ensures the stability of color boxes of different specifications during the printing process.

[0017] The present invention discloses a packaging color box surface printing device and method, wherein the trapezoidal extrusion plate in the ramp structure cooperates with the wedge-shaped extrusion surface of the positioning frame. When the positioning frame moves above the trapezoidal extrusion plate, the trapezoidal extrusion plate pushes the lifting plate upward under the action of the extrusion spring and the first hydraulic telescopic rod, so that the upper surface of the color box is precisely attached to the printing screen, ensuring the positional accuracy during printing and avoiding the problem of registration accuracy deviation caused by positional deviation. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is an isometric view of the present invention; Figure 2 This is a side view of the present invention; Figure 3 for Figure 2 Enlarged view of region A; Figure 4 This is an isometric view of the positioning frame of the present invention; Figure 5 This is a schematic cross-sectional view of the positioning frame structure of the present invention; Figure 6 for Figure 5 Enlarged view of region B; Figure 7 This is an isometric view of the ramp structure of the present invention; Figure 8 This is a schematic cross-sectional view of the fixed frame structure of the present invention; Figure 9 for Figure 8 Enlarged view of region C; Figure 10 for Figure 8 Enlarged view of region D; In the diagram: 1. Positioning frame; 2. Lifting plate; 3. Slide groove; 4. Slider; 5. Adjusting plate; 6. Adjusting bolt; 7. First positioning plate; 8. Second positioning plate; 9. Fixing bolt; 10. Moving groove; 11. Moving block; 12. Trapezoidal extrusion plate; 13. Mounting plate; 14. First hydraulic telescopic rod; 15. Extrusion spring; 16. Support component; 17. First support leg; 18. Wedge-shaped extrusion surface; 19. Fixing frame; 20. Printing screen; 21. Scraper; 22. Spreading plate; 3. Drive rod; 24. Second hydraulic telescopic rod; 25. Slide; 26. Bracket; 27. Positioning slot; 28. First crossbar; 29. ​​Cylinder; 30. Second crossbar; 31. Connecting rod; 32. Second support leg; 33. Slot; 34. Extrusion block; 35. Return spring; 36. Pneumatic telescopic rod; 37. Connector; 38. Electric heating plate; 39. Support plate; 40. Chain; 41. Sprocket; 42. Fixed rod; 43. Elastic rod; 44. Bracket; 45. Drive motor. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] To facilitate secondary printing on the color box body and improve the printing efficiency and convenience of the color box body, as an embodiment of the present invention, a packaging color box surface printing device and method is provided, including a conveying structure, a plurality of positioning structures for clamping the color box body on the conveying structure, a plurality of printing structures above the conveying structure, a drying structure on one side of each printing structure, and a plurality of ramp structures for squeezing the color box body upward below each printing structure.

[0022] During use, the positioning structure is adjusted according to the specifications and dimensions of the 3D color box to ensure the positioning of the color box to be processed, thus guaranteeing the accuracy of subsequent printing operations. The color box is loaded into the positioning structure, and the conveying structure is started. The driving force of the conveying structure drives the positioning structure to move towards the printing structure along the preset path. When the positioning structure reaches the designated position, the bottom forms a squeezing contact with the ramp structure. As the positioning structure continues to move, when the ramp structure moves below the positioning structure, the ramp structure pushes the color box in the positioning structure to move vertically upward. At this time, the operation of the conveying structure is paused. After the color box rises to the predetermined height, the upper surface is attached to the printing structure. The printing structure then performs printing operations on the upper surface of the color box, realizing the secondary printing of the color box, which significantly improves printing efficiency and ease of operation. After the first round of printing is completed, the conveying structure is reactivated, driving the positioning structure to continue moving forward. As the positioning structure moves, it disengages from the corresponding ramp structure, and the ramp structure no longer applies lifting force to the color box. The color box falls back to its initial position under the action of gravity. Driven by the conveying structure, the positioning structure continues to move forward. When it reaches a set of drying structures, the drying structure quickly dries the ink from the first printing, preparing it for subsequent printing processes. The positioning structure continues to move to a specific point and re-establishes a correspondence with the next set of ramp structures. The ramp structures then push the color box upward again, precisely aligning it with another set of printing structures. This set of printing structures completes the second layer of printing on the color box, realizing continuous multi-color printing of the color box, improving printing convenience, and facilitating multi-layer overprinting of complex graphics.

[0023] To facilitate the positioning of color box bodies of different sizes, for example, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6As shown, the present invention also includes a positioning frame 1, a horizontally arranged lifting plate 2 on the inner side of the positioning frame 1, a plurality of vertically arranged sliding grooves 3 on the inner side of the positioning frame 1, a slider 4 slidably connected to the sliding grooves 3 on the outer side of the lifting plate 2, a horizontally arranged adjusting plate 5 on the upper surface of the lifting plate 2, a vertically arranged adjusting bolt 6 rotatably connected to the adjusting plate 5, and the lower end of the adjusting bolt 6 passing through the lifting plate 2 and threadedly connected to the lifting plate 2.

[0024] Two sets of symmetrically arranged first positioning plates 7 are provided above the adjustment plate 5. A second positioning plate 8 is provided between the two ends of the two sets of first positioning plates 7. The first positioning plate 7 and the second positioning plate 8 are rotatably connected to the side away from the center of the positioning frame 1 by a fixing bolt 9. One end of the fixing bolt 9 passes through the positioning frame 1 and is threadedly connected to the positioning frame 1. A moving groove 10 is provided on the inner side of the positioning frame 1. A moving block 11 is provided on the end face of the first positioning plate 7 and is slidably connected to the moving groove 10.

[0025] When in use, the adjusting bolt 6 is threadedly connected to the lifting plate 2. When the adjusting bolt 6 is rotated, the adjusting plate 5 can be moved up and down in the vertical direction. This allows the position of the adjusting plate 5 to be adjusted according to the height of the color box body, ensuring that color boxes of different thicknesses are at a suitable height during the printing process, and avoiding the impact on printing accuracy due to unsuitable height. When it is necessary to accommodate color box bodies of different lengths and widths, the first positioning plate 7 is adjusted in position by rotating the fixing bolt 9 on one side of the first positioning plate 7 and the second positioning plate 8, allowing the first positioning plate 7 to slide within the moving groove 10 on the inner side of the positioning frame 1 via the moving block 11 on its end face. At the same time, the position of the second positioning plate 8 can be adjusted by rotating the fixing bolt 9, thereby adjusting the clamping space formed by the two sets of first positioning plates 7 and second positioning plates 8 in the length and width directions. After being adjusted to the appropriate position, the positioning structure can then position color box bodies of different sizes, improving the adaptability of the device to color box bodies of different specifications, ensuring that the color box body will not shake or shift during the printing process, and guaranteeing the stability and accuracy of the printing operation.

[0026] To facilitate lifting the color box body and ensuring the upper surface of the color box fits the printing structure, thus aiding subsequent printing operations, for example, such as... Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 As shown, the present invention also includes a ramp structure comprising a horizontally arranged trapezoidal extrusion plate 12, an mounting plate 13 below the trapezoidal extrusion plate 12, a first hydraulic telescopic rod 14 and a compression spring 15 connecting the trapezoidal extrusion plate 12 and the mounting plate 13, a support member 16 fixedly connected to the lower surface of the mounting plate 13, and a first support leg 17 fixedly connected to both ends of the support member 16, and a wedge-shaped extrusion surface 18 on the lower edge of the positioning frame 1 that is in extrusion contact with the trapezoidal extrusion plate 12.

[0027] In use, when the positioning frame 1 moves with the conveying structure above the trapezoidal extrusion plate 12, the wedge-shaped extrusion surface 18 at the lower edge of the positioning frame 1 contacts and applies pressure to the trapezoidal extrusion plate 12, pushing the trapezoidal extrusion plate 12 downward. At this time, the trapezoidal extrusion plate 12 compresses the compression spring 15 between itself and the mounting plate 13, and simultaneously the first hydraulic telescopic rod 14 is compressed. As the positioning frame 1 continues to move, the lower part of one side of the positioning frame 1 passes over the trapezoidal extrusion plate 12, so that the trapezoidal extrusion plate 12 is located directly below the inner side of the positioning frame 1. At this time, the conveying structure temporarily... When the operation stops, the trapezoidal extrusion plate 12 is no longer squeezed by the positioning frame 1. The compression spring 15 releases its elastic potential energy, pushing the trapezoidal extrusion plate 12 to reset upward. After the trapezoidal extrusion plate 12 moves upward, the top surface of the trapezoidal extrusion plate 12 contacts the lower surface of the lifting plate 2 and continues to apply force, causing the lifting plate 2 to slide upward along the slide groove 3 on the inner side of the positioning frame 1. The outer slider 4 of the lifting plate 2 maintains a sliding connection with the slide groove 3. When the lifting plate 2 moves upward, the color box body is simultaneously lifted by the adjusting plate 5, so that the upper surface of the color box fits the printing structure, which facilitates subsequent printing operations.

[0028] For ease of printing operations, for example, such as Figure 1 , Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown, the present invention also includes a printing structure comprising a fixed frame 19 disposed above the trapezoidal extrusion plate 12, a printing screen 20 horizontally disposed at the bottom of the inner side of the fixed frame 19, a vertically disposed scraper 21 and a spreading plate 22 disposed on the upper surface of the printing screen 20, and a horizontally disposed drive rod 23 fixedly connected to the upper surface of the scraper 21. Both ends of the drive rod 23 are connected to vertical second hydraulic telescopic rods 24. The lower end of the second hydraulic telescopic rod 24 is connected to a slide block 25. The two sets of slide blocks 25 are connected to the material spreading plate 22 by brackets 26. The positioning frame 1 is provided with horizontally arranged positioning grooves 27 on both sides near the slide block 25. A positioning block that is slidably connected to the positioning groove 27 is provided on one side of the slide block 25. The first hydraulic telescopic rod 14 is connected to the inside of the second hydraulic telescopic rod 24 through a pipeline.

[0029] In use, when the color box body moves up with the lifting plate 2, the top surface of the color box body fits against the lower surface of the printing screen 20 in the fixed frame 19, completing the position calibration before printing. Then, the drive slide 25 slides smoothly along the positioning grooves 27 on both sides of the positioning frame 1, and the positioning block on one side of the slide 25 is slidably connected to the positioning groove 27. When the slide 25 moves, it synchronously drives the scraper 21 on the second hydraulic telescopic rods 24 at both ends and the spreading plate 22 on the bracket 26 to move together. During the movement, the scraper 21 applies uniform pressure to the printing screen 20, so that the ink is accurately transferred to the upper surface of the color box through the screen holes, completing the high-precision printing operation. After printing, the conveying structure drives the positioning frame 1 to move. The wedge-shaped extrusion surface 18 at the bottom of the positioning frame 1 extrudes the trapezoidal extrusion plate 12 again. The trapezoidal extrusion plate 12 moves downward under pressure and simultaneously extrudes the first hydraulic telescopic rod 14. Since the first hydraulic telescopic rod 14 and the second hydraulic telescopic rod 24 are connected by a pipeline, the output end of the second hydraulic telescopic rod 24 extends, driving the scraper 21 to move upward to a safe height and detach from the printing screen 20. Subsequently, the slide 25 moves in the opposite direction, and the spreading plate 22 moves synchronously with the scraper 21. The spreading plate 22 moves on the surface of the printing screen 20. The ink is spread evenly on the surface. At this time, the squeegee 21 and the screen remain in a non-contact state, effectively avoiding interference with the ink spreading process. When the positioning frame 1 completely passes the trapezoidal extrusion plate 12, the pressure of the first hydraulic telescopic rod 14 is released, and the extrusion spring 15 is reset. The second hydraulic telescopic rod 24 quickly resets and retracts, driving the squeegee 21 down to the initial working position, and extruding and contacting the printing screen 20 again, preparing for the printing of the next set of color boxes. The ink spreading is completed synchronously when the positioning frame 1 moves, overlapping the ink spreading and conveying time, further improving printing efficiency.

[0030] For example, such as Figure 8 , Figure 9 , Figure 10 As shown, the present invention also includes a first horizontal bar 28 horizontally arranged on one side of the fixed frame 19, a cylinder 29 connecting the slide 25 and the first horizontal bar 28, a second horizontal bar 30 horizontally arranged on the side of the fixed frame 19 away from the first horizontal bar 28, a connecting rod 31 fixedly connected between the fixed frame 19 and the second horizontal bar 30, and several sets of vertically arranged second support legs 32 fixedly connected to the lower surfaces of the first horizontal bar 28 and the second horizontal bar 30.

[0031] In use, the cylinder 29 connects the slide 25 and the first crossbar 28. The slide 25 is driven by air pressure to move back and forth along the positioning groove 27, which can control the printing stroke and material laying trajectory of the scraper 21. During printing, the cylinder 29 provides driving force to make the scraper 21 squeeze the screen. During material laying, the drive slide 25 drives the material laying plate 22 to spread the ink evenly, which is suitable for high-speed printing requirements. The first crossbar 28 and the second crossbar 30 are fixed to the fixed frame 19 by the connecting rod 31 to form a rigid frame structure. Together with the vertical support of the second support leg 32, the fixed frame 19 and the cylinder 29 are kept stable, ensuring the uniformity of the ink layer and the accuracy of pattern registration.

[0032] To further ensure the stability of the color box body, for example, such as Figure 4 , Figure 5 , Figure 6As shown, the present invention also includes a slot 33 on the side of the first positioning plate 7 and the second positioning plate 8 away from the fixing bolt 9. A pressing block 34 is slidably connected in the slot 33. A return spring 35 is fixedly connected between the pressing block 34 and the slot 33. A pneumatic telescopic rod 36 is connected between the slider 4 and the bottom of the slide groove 3. A connector 37 communicating with the slot 33 is provided on the side of the first positioning plate 7 and the second positioning plate 8 away from the pressing block 34. The fixed end of the pneumatic telescopic rod 36 is connected to the connector 37 through a pipeline.

[0033] During use, when the positioning frame 1 moves with the conveying structure to above the trapezoidal extrusion plate 12, the trapezoidal extrusion plate 12 is located directly below the inner side of the positioning frame 1. At this time, the conveying structure stops operating, and the trapezoidal extrusion plate 12 is no longer squeezed by the positioning frame 1. The extrusion spring 15 releases its elastic potential energy, pushing the lifting plate 2 to move upward along the slide 3. The slider 4 on the outer side of the lifting plate 2 moves upward synchronously, squeezing the pneumatic telescopic rod 36 between the slider 4 and the bottom of the slide 3. After the pneumatic telescopic rod 36 is compressed, the internal gas is injected into the slots 33 of the first positioning plate 7 and the second positioning plate 8 through the pipe and connector 37, pushing the extrusion block 34 to slide outward against the resistance of the return spring 35. The extrusion block 34 moves outward from the slot. After the groove 33 extends, it fits tightly against the long and wide sides of the color box body, forming a multi-point clamping to ensure that the color box body does not shift during the printing process. When the scraper 21 moves down to squeeze the printing screen 20, the clamping force of the extrusion block 34 on the outside of the box body can offset part of the lateral force, avoiding deformation of the upper part of the box body due to uneven force, such as corner collapse or surface bulging. After the printing operation is completed, the positioning frame 1 continues to move past the trapezoidal extrusion plate 12, the lifting plate 2 falls back under the action of gravity, the slider 4 releases the pressure on the pneumatic telescopic rod 36, the gas in the pneumatic telescopic rod 36 flows back through the pipeline, and the extrusion block 34 retracts into the groove 33 under the action of the return spring 35, releasing the clamping of the color box.

[0034] For example, such as Figure 8 As shown, the present invention also includes an electric heating plate 38 horizontally arranged on one side of the fixed frame 19 in the drying structure, and the first crossbar 28 and the second crossbar 30 are fixedly connected to one side of the electric heating plate 38 through the support plate 39.

[0035] During use, after the color box is printed, it moves forward with the positioning frame 1 by the conveying structure to the drying station directly below the electric heating plate 38. The electric heating plate 38 is turned on in advance to form a uniform heat radiation area. When the color box moves under the electric heating plate 38, the ink printed on the surface absorbs the heat radiation energy, and the solvent evaporates and solidifies quickly. After the color box leaves the area of ​​the electric heating plate 38, the ink has been initially solidified, which can avoid problems such as smudging and smudging during subsequent conveying or secondary printing.

[0036] For example, such as Figure 1 , Figure 2As shown, the present invention also includes a conveying structure comprising two sets of symmetrically arranged chains 40, with sprockets 41 meshing and driving on the inner side of the chains 40. Fixed rods 42 and elastic rods 43 are fixedly connected to both sides of the positioning frame 1, with the ends of the fixed rods 42 and elastic rods 43 away from the positioning frame 1 being fixedly connected to one side of the chains 40. The side of the sprockets 41 away from the positioning frame 1 is rotatably connected to a vertically arranged bracket 44, and a drive motor 45 for driving the sprockets 41 to rotate is provided on one side of the bracket 44.

[0037] In use, the drive motor 45 outputs torque to drive the sprocket 41 to rotate. The sprocket 41 and the chain 40 are connected by a meshing structure. The fixed rod 42 on the chain 40 provides stable support. The elastic rod 43 uses deformation to compensate for the trajectory difference of the sprocket 41 when turning, ensuring that the positioning frame 1 smoothly transitions to below the chain 40 at the turning position. After the color box completes the printing, drying and other processes, it moves along the chain 40 with the positioning frame 1 to the preset flipping position. The elastic rod 43 drives the positioning frame 1 to flip around the center of the sprocket 41 due to the change in the trajectory of the chain 40 at the flipping station, so that the positioning frame 1 changes from the horizontal conveying state to the downward tilting state. After the positioning frame 1 tilts, the color box slides down the inclined surface due to gravity, completing the automatic unloading. There is no need for manual material handling. The unloading process is linked with the conveyor chain, which effectively reduces labor costs.

[0038] The present invention also provides a method for printing on the surface of a packaging color box, using the above-mentioned packaging color box surface printing apparatus, specifically including the following steps: S1. Adjust the positioning structure and place the color box body into the positioning structure; S2. The conveying structure drives the positioning structure to move, and after moving the color box body to the top of the ramp structure, it stops, and the ramp structure lifts the color box. S3. The printing structure prints on the raised color box body; S4. After the color box body is printed, the conveying structure drives the positioning structure to move, moving the color box to the bottom of the drying structure for drying, completing one layer of printing. S5. Repeat steps S2 to S4 to complete the multi-layer overprinting on the surface of the color box.

[0039] When using this invention, rotating the adjusting bolt 6 according to the specifications and dimensions of the three-dimensional color box body can drive the adjusting plate 5 to move up and down in the vertical direction. This allows the position of the adjusting plate 5 to be adjusted according to the height of the color box body, ensuring that color boxes of different thicknesses can be at a suitable height during the printing process, thus avoiding the impact on printing accuracy due to unsuitable height. When it is necessary to accommodate color box bodies of different lengths and widths, the first positioning plate 7 is adjusted in position by rotating the fixing bolt 9 on one side of the first positioning plate 7 and the second positioning plate 8, allowing the first positioning plate 7 to slide within the moving groove 10 on the inner side of the positioning frame 1 via the moving block 11 on its end face. At the same time, the position of the second positioning plate 8 can be adjusted by rotating the fixing bolt 9, thereby adjusting the clamping space formed by the two sets of first positioning plates 7 and second positioning plates 8 in the length and width directions. After being adjusted to the appropriate position, the positioning structure can then position color box bodies of different sizes, improving the adaptability of the device to color box bodies of different specifications. The drive motor 45 outputs torque to drive the sprocket 41 to rotate. The sprocket 41 and the chain 40 are meshed together, driving the positioning frame 1 to move along a preset path toward the printing structure. When the positioning frame 1 moves with the conveying structure above the trapezoidal extrusion plate 12, the wedge-shaped extrusion surface 18 at the lower edge of the positioning frame 1 contacts the trapezoidal extrusion plate 12 and applies pressure, pushing the trapezoidal extrusion plate 12 downward. At this time, the trapezoidal extrusion plate 12 squeezes the compression spring 15 between itself and the mounting plate 13, and at the same time, the first hydraulic telescopic rod 14 is compressed. As the positioning frame 1 continues to move, the lower part of one side of the positioning frame 1 passes over the trapezoidal extrusion plate. 12. Position the trapezoidal extrusion plate 12 directly below the inner side of the positioning frame 1. At this time, the conveying structure stops operating, and the trapezoidal extrusion plate 12 is no longer squeezed by the positioning frame 1. The extrusion spring 15 releases its elastic potential energy and pushes the trapezoidal extrusion plate 12 to reset upward. After the trapezoidal extrusion plate 12 moves upward, the top surface of the trapezoidal extrusion plate 12 contacts the lower surface of the lifting plate 2 and continues to apply force, causing the lifting plate 2 to slide upward along the slide groove 3 inside the positioning frame 1. The outer slider 4 of the lifting plate 2 maintains a sliding connection with the slide groove 3. When the lifting plate 2 moves upward, the color box body is simultaneously lifted by the adjusting plate 5 so that the upper surface of the color box fits the printing structure. The slider 4 on the outside of the lifting plate 2 moves upward synchronously, squeezing the pneumatic telescopic rod 36 between the slider 4 and the bottom of the slide groove 3. After the pneumatic telescopic rod 36 is compressed, the internal gas is injected into the slot 33 of the first positioning plate 7 and the second positioning plate 8 through the pipe and the connector 37, pushing the extrusion block 34 to overcome the resistance of the return spring 35 and slide outward. After the extrusion block 34 extends out of the slot 33, it fits tightly against the long and wide sides of the color box body, forming a multi-point clamping to ensure that the color box body does not shift during the printing process. When the scraper 21 moves down to squeeze the printing screen 20, the clamping force of the extrusion block 34 on the outside of the box body can offset part of the lateral force, avoiding deformation of the upper part of the box body due to uneven force, such as corner collapse and surface bulging. As the color box body moves upward with the lifting plate 2, the top surface of the color box body fits against the lower surface of the printing screen 20 inside the fixed frame 19, completing the position calibration before printing. Then, the cylinder 29 drives the slide 25 to slide smoothly along the positioning grooves 27 on both sides of the positioning frame 1. The positioning block on one side of the slide 25 is slidably connected to the positioning groove 27. When the slide 25 moves, it synchronously drives the scraper 21 on the second hydraulic telescopic rods 24 at both ends and the spreading plate 22 on the bracket 26 to move together. During the movement, the scraper 21 applies uniform pressure to the printing screen 20, so that the ink is accurately transferred to the upper surface of the color box through the screen holes, completing the high-precision printing operation. After printing, the conveying structure drives the positioning frame 1 to move. The wedge-shaped extrusion surface 18 at the bottom of the positioning frame 1 extrudes the trapezoidal extrusion plate 12 again. The trapezoidal extrusion plate 12 moves downward under pressure and simultaneously extrudes the first hydraulic telescopic rod 14. Since the first hydraulic telescopic rod 14 and the second hydraulic telescopic rod 24 are connected by a pipeline, the output end of the second hydraulic telescopic rod 24 extends, driving the scraper 21 to move upward to a safe height and detach from the printing screen 20. Subsequently, the slide 25 moves in the opposite direction, and the spreading plate 22 moves synchronously with the scraper 21. The spreading plate 22 moves on the surface of the printing screen 20. The ink is spread evenly on the surface. At this time, the squeegee 21 and the screen remain in a non-contact state, effectively avoiding interference with the ink spreading process. When the positioning frame 1 completely passes the trapezoidal extrusion plate 12, the pressure of the first hydraulic telescopic rod 14 is released, and the extrusion spring 15 is reset. The second hydraulic telescopic rod 24 quickly resets and retracts, driving the squeegee 21 to move down to the initial working position and press against the printing screen 20 again, preparing for the printing of the next set of color boxes. The ink spreading is completed synchronously when the positioning frame 1 moves, overlapping the ink spreading and conveying time, further improving printing efficiency. When the positioning frame 1 moves past the trapezoidal extrusion plate 12, the lifting plate 2 falls back under the action of gravity, the slider 4 releases the extrusion of the pneumatic telescopic rod 36, the gas in the pneumatic telescopic rod 36 flows back through the pipeline, and the extrusion block 34 retracts into the slot 33 under the action of the reset spring 35, releasing the clamping of the color box. Driven by the conveying structure, the positioning frame 1 continues to move forward. When it reaches a set of electric heating plates 38, the electric heating plates 38 dry the ink of the first printing to prepare for the subsequent printing process. The positioning frame 1 continues to move to a specific point and re-establishes a correspondence with the next set of trapezoidal extrusion plates 12. The trapezoidal extrusion plates 12 push the color box body upward again and align it with another set of printing screens 20. The second layer of printing of the color box body is completed by the printing screens 20, realizing the continuous operation of multi-color printing of color boxes, improving printing convenience, and facilitating multi-layer overprinting of complex graphics. After the color box completes all processes such as printing and drying, it moves along the chain 40 with the positioning frame 1 to the preset flipping position. The elastic rod 43 drives the positioning frame 1 to flip around the center of the sprocket 41 due to the change in the trajectory of the chain 40 at the flipping station, so that the positioning frame 1 changes from a horizontal conveying state to a downward tilting state. After the positioning frame 1 tilts, the color box slides down the inclined surface due to gravity, completing the automatic unloading. No manual material handling is required. The unloading process is linked with the conveyor chain, which effectively reduces labor costs.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A packaging box surface printing device, characterized in that, It includes a conveying structure, which is equipped with several sets of positioning structures for clamping the color box body. Above the conveying structure, there are several sets of printing structures. Each side of the printing structure is equipped with a drying structure. Below the printing structure, there are several sets of ramp structures for squeezing the color box body upward. The positioning structure includes a positioning frame (1), a horizontally arranged lifting plate (2) is provided inside the positioning frame (1), a number of vertically arranged sliding grooves (3) are provided inside the positioning frame (1), a slider (4) is provided on the outside of the lifting plate (2) and is slidably connected to the sliding grooves (3), a horizontally arranged adjusting plate (5) is provided on the upper surface of the lifting plate (2), and a vertically arranged adjusting bolt (6) is rotatably connected on the adjusting plate (5). The lower end of the adjusting bolt (6) passes through the lifting plate (2) and is threadedly connected to the lifting plate (2). Two sets of symmetrically arranged first positioning plates (7) are provided above the adjustment plate (5). A second positioning plate (8) is provided between the two ends of the two sets of first positioning plates (7). The first positioning plate (7) and the second positioning plate (8) are rotatably connected to the fixing bolt (9) on the side away from the center of the positioning frame (1). The ramp structure includes a horizontally arranged trapezoidal extrusion plate (12), a mounting plate (13) is provided below the trapezoidal extrusion plate (12), a first hydraulic telescopic rod (14) and a compression spring (15) are connected between the trapezoidal extrusion plate (12) and the mounting plate (13), a support member (16) is fixedly connected to the lower surface of the mounting plate (13), and a first support leg (17) is fixedly connected to both ends of the support member (16). The lower edge of the positioning frame (1) is provided with a wedge-shaped extrusion surface (18) that is in extrusion contact with the trapezoidal extrusion plate (12). The printing structure includes a fixed frame (19) set above the trapezoidal extrusion plate (12), a printing screen (20) is horizontally set at the bottom of the inner side of the fixed frame (19), a vertically set scraper (21) and a spreading plate (22) are provided on the upper surface of the printing screen (20), and a horizontally set drive rod (23) is fixedly connected to the upper surface of the scraper (21). Both ends of the drive rod (23) are connected to the vertical second hydraulic telescopic rod (24). The lower end of the second hydraulic telescopic rod (24) is connected to the slide (25). The two sets of slides (25) are connected to the material plate (22) by the bracket (26). The positioning frame (1) is provided with horizontally arranged positioning grooves (27) on both sides near the slide (25). The slide (25) is provided with a positioning block that is slidably connected to the positioning groove (27) on one side. The first hydraulic telescopic rod (14) is connected to the inside of the second hydraulic telescopic rod (24) through the pipeline. The first positioning plate (7) and the second positioning plate (8) are provided with a slot (33) on the side away from the fixing bolt (9). A pressing block (34) is sealed and slidably connected in the slot (33). A return spring (35) is fixedly connected between the pressing block (34) and the slot (33). A pneumatic telescopic rod (36) is connected between the slider (4) and the bottom of the slide (3). The first positioning plate (7) and the second positioning plate (8) are provided with a connector (37) connected to the slot (33) on the side away from the pressing block (34). The fixed end of the pneumatic telescopic rod (36) is connected to the connector (37) through a pipeline.

2. The packaging color box surface printing device according to claim 1, characterized in that, One end of the fixing bolt (9) passes through the positioning frame (1) and is threaded to the positioning frame (1). The inner side of the positioning frame (1) is provided with a moving groove (10), and the end face of the first positioning plate (7) is provided with a moving block (11) that is slidably connected to the moving groove (10).

3. The packaging color box surface printing device according to claim 1, characterized in that, A first horizontal bar (28) is provided on one side of the fixed frame (19), and a cylinder (29) is connected between the slide (25) and the first horizontal bar (28). A second horizontal bar (30) is provided on the side of the fixed frame (19) away from the first horizontal bar (28). A connecting rod (31) is fixedly connected between the fixed frame (19) and the second horizontal bar (30). Several sets of vertically arranged second legs (32) are fixedly connected to the lower surfaces of the first horizontal bar (28) and the second horizontal bar (30).

4. The packaging color box surface printing device according to claim 3, characterized in that, The drying structure includes an electric heating plate (38) horizontally set on one side of the fixed frame (19), and the first crossbar (28) and the second crossbar (30) are fixedly connected to one side of the electric heating plate (38) through the support plate (39).

5. The packaging color box surface printing device according to claim 4, characterized in that, The conveying structure includes two sets of symmetrically arranged chains (40). The inner side of the chains (40) is meshed with sprockets (41). The two sides of the positioning frame (1) are respectively fixedly connected to a fixed rod (42) and an elastic rod (43). The ends of the fixed rods (42) and elastic rods (43) away from the positioning frame (1) are fixedly connected to one side of the chains (40). The side of the sprocket (41) away from the positioning frame (1) is rotatably connected to a vertically arranged bracket (44). A drive motor (45) for driving the sprocket (41) to rotate is provided on one side of the bracket (44).

6. A method for printing on the surface of a packaging color box, characterized in that, The packaging box surface printing apparatus according to any one of claims 1 to 5 specifically includes the following steps: S1. Adjust the positioning structure and place the color box body into the positioning structure; S2. The conveying structure drives the positioning structure to move, and after moving the color box body to the top of the ramp structure, it stops, and the ramp structure lifts the color box. S3. The printing structure prints on the raised color box body; S4. After the color box body is printed, the conveying structure drives the positioning structure to move, moving the color box to the bottom of the drying structure for drying, completing one layer of printing. S5. Repeat steps S2 to S4 to complete the multi-layer overprinting on the surface of the color box.

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