A three-dimensional pattern forming and pressing device and process for a packaging box

Abstract

The application discloses a packaging box three-dimensional pattern forming and pressing device and relates to the packaging box processing technical field.The application comprises a bottom frame, the surface of the bottom frame is fixedly connected with an L-shaped support, the top of the support is fixedly connected with an air cylinder, one end of the air cylinder piston rod is slidably penetrated through the top of the support, the circumference of the air cylinder piston rod is fixedly connected with a pressing plate, the bottom of the pressing plate is provided with a negative pressure box, a plurality of connecting assemblies are arranged between the negative pressure box and the pressing plate, and one end of the air cylinder piston rod is fixedly connected with an upper die.The application can reduce the air in the negative pressure box, thereby reducing the air in the three-dimensional pattern after the paperboard is pressed, improving the pressing effect and the three-dimensional pattern keeping time, positioning the two sides of the paperboard through the first positioning plate and the second positioning plate, improving the accuracy of the paperboard placement, and adsorbing the paperboard through the suction cup to keep the stability of the paperboard.

Description

Technical Field

[0001] This invention belongs to the field of packaging box processing technology, and in particular relates to a packaging box three-dimensional pattern forming and pressing device and process. Background Technology

[0002] Packaging boxes, as the name suggests, are boxes used to package products. They are widely used in various industries and are an indispensable part of the industry. Packaging boxes can ensure the safety of products during transportation and enhance the product's quality. With the rapid development of modern industry and the continuous improvement of people's living standards, the demand for packaging boxes will continue to increase. Among them, paper packaging boxes are inexpensive, easy to process, and recyclable, making them more popular.

[0003] To enhance the aesthetics of packaging boxes, three-dimensional patterns are typically pressed onto the raw cardboard before the boxes are formed. This requires the use of a pressing device. However, existing pressing devices use a direct pressing method, and since cardboard is usually multi-layered, incomplete air removal after pressing affects the retention time of the three-dimensional appearance. Therefore, a three-dimensional pattern forming pressing device and process for packaging boxes is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a packaging box three-dimensional pattern forming and pressing device and process, which can reduce the air in the negative pressure box, thereby reducing the air in the three-dimensional pattern after the cardboard is pressed, improving the pressing effect and the retention time of the three-dimensional pattern. At the same time, it can position the two sides of the cardboard through the first positioning plate and the second positioning plate to improve the accuracy of cardboard placement. It can also use suction cups to adsorb the cardboard to maintain the stability of the cardboard, thus solving the existing technical problems.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] A three-dimensional pattern forming and pressing device for packaging boxes includes:

[0007] The base frame has an L-shaped bracket fixedly connected to its surface. A cylinder is fixedly connected to the top of the bracket. One end of the cylinder piston rod slides through the top of the bracket. A pressure plate is fixedly connected to the circumference of the cylinder piston rod. A negative pressure box is installed at the bottom of the pressure plate. The negative pressure box reduces the air in the box, thereby reducing the air in the three-dimensional pattern after the cardboard is pressed, improving the pressing effect and the retention time of the three-dimensional pattern. Multiple connecting components are provided between the negative pressure box and the pressure plate.

[0008] One end of the cylinder piston rod is fixedly connected to an upper mold, and the upper surface of the base frame is fixedly connected to a lower mold that cooperates with the upper mold.

[0009] A ventilation mechanism is provided at the top of the negative pressure box to ventilate the negative pressure box.

[0010] A fixing mechanism is provided on one side of the base frame to fix the cardboard.

[0011] Furthermore, the connecting assembly includes a guide rod, which is fixedly connected to the top of the negative pressure box. The guide rod slides through the pressure plate, and a first spring is sleeved on the circumference of the guide rod. The top and bottom of the first spring are fixed to the pressure plate and the negative pressure box, respectively. The negative pressure box can be moved by the first spring, and the negative pressure box can be reset after it moves.

[0012] Furthermore, the ventilation mechanism includes a negative pressure tube and a U-shaped positioning frame. The negative pressure tube is fixedly connected to the top of the negative pressure box. A ventilation cavity is provided around the circumference of the negative pressure tube. A guide frame is fixedly connected to the inner wall of the ventilation cavity. A through slide rod is slidably connected to the top of the guide frame. A first piston is fixedly connected to the bottom of the slide rod. The first piston is slidably connected to the negative pressure tube. A second spring is sleeved around the circumference of the slide rod. The top and bottom of the second spring are fixed to the guide frame and the first piston, respectively. The positioning frame is fixedly connected to the surface of the base frame. A top rod is fixedly connected to the top of the positioning frame. The top rod is located below the first piston and pushes the first piston. By using the ventilation mechanism, ventilation can be carried out in the negative pressure box, thereby making the ventilation of the negative pressure box more automated.

[0013] Furthermore, the ventilation mechanism also includes a fixing rod and an air inlet. The fixing rod is fixedly connected to the top of the upper mold, and a thin rod is fixedly connected to the top of the fixing rod. A plug is fixedly connected to the top of the thin rod. The air inlet is opened on the top of the negative pressure box and works in conjunction with the plug. The diameter of the thin rod is smaller than the diameter of the air inlet. By using the cooperation of the air inlet and the plug, air can be replenished to the negative pressure box, which facilitates the reset of the negative pressure box.

[0014] Furthermore, a slider is fixedly connected to one side of the negative pressure box, and a through slide is provided on one side of the bracket. The slider is slidably connected to the slide, thereby increasing the stability of the movement of the negative pressure box.

[0015] Furthermore, the fixing mechanism includes an air pipe that is fixedly penetrates the surface of the base frame. A second piston is slidably connected to the inner circumference of the air pipe. A third spring is fixedly connected between the bottom of the second piston and the bottom of the air pipe. A pressure rod is fixedly connected to the top of the second piston. The top of the pressure rod slidably penetrates the top of the air pipe. The pressure rod is located below the slider and works in conjunction with the slider. A multi-port pipe is fixedly connected to one side of the air pipe. Multiple air outlets of the multi-port pipe are fixedly connected to connecting pipes. The top of each connecting pipe is fixedly connected to a suction cup. The surface of the lower mold has multiple perforations that work with the suction cups. The suction cups are located within the perforations. Auxiliary air holes are provided around the circumference of the air pipe. By setting up the suction cups, after the slider contacts the pressure rod, the pressure rod pushes the second piston downward, thereby creating a negative pressure above the second piston. The pressure enters the suction cups through the multi-port pipes and connecting pipes, and the suction cups adsorb the cardboard, maintaining the stability of the cardboard.

[0016] Furthermore, a first positioning plate for positioning the side of the cardboard is fixedly connected to one side of the positioning frame, and a threaded rod is threadedly connected to one side of the bracket. A second positioning plate is rotatably connected to the end of the threaded rod near the lower mold. Rotating the threaded rod can adjust the position of the second positioning plate, thereby improving the flexibility of positioning the cardboard.

[0017] Furthermore, a set of storage boxes is provided at the bottom of the base frame.

[0018] This invention also proposes a processing technology for a packaging box three-dimensional pattern forming and pressing device, including the following steps:

[0019] S1: The negative pressure pipe is connected to the external negative pressure tank through a flexible pipe. Rotate the threaded rod, which drives the second positioning plate to move. Then, place the cardboard to be processed on the lower mold, keeping one side of the cardboard in contact with the first positioning plate and the other side in contact with the second positioning plate. Then start the cylinder.

[0020] S2: The cylinder drives the pressure plate, negative pressure box and upper mold to move downward. The negative pressure box first contacts the surface of the base frame, and at the same time, the push rod abuts against the bottom of the first piston, pushing the first piston into the ventilation chamber, thereby drawing out the air in the negative pressure box. As the cylinder continues to start, the negative pressure box remains stationary and the upper mold continues to move downward. It also drives the plug to move downward through the fixed rod and thin rod to block the air inlet, so that the air in the negative pressure box is under negative pressure. Then, the upper mold and lower mold cooperate to press and form the cardboard.

[0021] S3: When the cylinder piston rod is reset, the upper mold first drives the plug to disengage from the air inlet, releasing the negative pressure state in the negative pressure box. Then the negative pressure box is reset along with the cylinder piston rod, while the first piston remains to block the negative pressure pipe under the push of the second spring.

[0022] S4: When the negative pressure box moves downward, it drives the slider to move downward. After the slider contacts the pressure rod, it pushes the second piston downward through the pressure rod, thereby creating a negative pressure above the second piston. The pressure enters the suction cup through the multi-port pipe and connecting pipe, and the suction cup adsorbs the cardboard to maintain its stability. When the cardboard is pressed, air enters the air pipe through the auxiliary air hole. When the second piston returns to its original position, the air is sprayed out through the multi-port pipe and suction cup, which blows the cardboard up, making it easier for people to collect the cardboard.

[0023] The embodiments of the present invention have the following beneficial effects:

[0024] In this invention, by setting up a space for vacuuming before pressing the cardboard, the air in the negative pressure box is reduced before pressing, thereby reducing the air in the three-dimensional pattern after pressing, improving the pressing effect and the retention time of the three-dimensional pattern.

[0025] In this invention, the first positioning plate and the second positioning plate work together to position the two sides of the cardboard when it is placed on the lower mold, thereby improving the accuracy of cardboard placement.

[0026] In this invention, the suction cup allows the slider to contact the pressure rod, which then pushes the second piston downward, creating a negative pressure above the second piston. This pressure enters the suction cup through the multi-port pipe and connecting pipe, allowing the suction cup to adhere to the cardboard and maintain its stability.

[0027] In this invention, when the cardboard is pressed, air enters the air pipe through the auxiliary air hole, and when the second piston is reset, the air is sprayed out through the multi-port pipe and suction cup, thereby blowing the cardboard up, making it convenient for people to collect the cardboard.

[0028] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a three-dimensional structural diagram of a first perspective according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of a two-dimensional structure from a second perspective according to an embodiment of the present invention;

[0032] Figure 3 This is a partial cross-sectional structural schematic diagram of an embodiment of the present invention;

[0033] Figure 4 This is a cross-sectional view of a negative pressure pipe according to an embodiment of the present invention;

[0034] Figure 5 This is a cross-sectional view of a negative pressure box according to an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the trachea cross-sectional structure according to an embodiment of the present invention.

[0036] In the diagram: 1. Base frame; 2. Lower mold; 3. Support; 4. Cylinder; 5. Positioning frame; 6. Push rod; 7. First positioning plate; 8. Storage box; 9. Slide rail; 10. Slider; 11. Threaded rod; 12. Second positioning plate; 13. Pressure plate; 14. Guide rod; 15. First spring; 16. Negative pressure box; 17. Upper mold; 18. Negative pressure pipe; 19. Vent chamber; 20. Guide frame; 21. Slide rod; 22. First piston; 23. Second spring; 24. Fixing rod; 25. Thin rod; 26. Plug; 27. Air inlet; 28. Air pipe; 29. ​​Multi-port pipe; 30. Connecting pipe; 31. Suction cup; 32. Pressure rod; 33. Second piston; 34. Third spring; 35. Auxiliary air hole. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0039] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0040] Example 1

[0041] Please see Figures 1-6As shown, this embodiment provides a packaging box three-dimensional pattern forming and pressing device, including: a base frame 1, and conveyors for conveying on both sides of the base frame 1, which can cooperate with a robot to complete automatic production. An L-shaped bracket 3 is fixedly connected to the surface of the base frame 1, and a cylinder 4 is fixedly connected to the top of the bracket 3. One end of the piston rod of the cylinder 4 slides through the top of the bracket 3. A pressure plate 13 is fixedly connected to the circumference of the piston rod of the cylinder 4. A negative pressure box 16 is installed at the bottom of the pressure plate 13. Before the cardboard is pressed, the air in the negative pressure box 16 is reduced, so that after the cardboard is pressed, the air in the three-dimensional pattern is reduced, thereby improving the pressing effect and the holding time of the three-dimensional pattern. Multiple connecting components are provided between the negative pressure box 16 and the pressure plate 13.

[0042] One end of the piston rod of cylinder 4 is fixedly connected to an upper mold 17, and the upper surface of the base frame 1 is fixedly connected to a lower mold 2 that works with the upper mold 17. The upper mold 17 and the lower mold 2 work together to press the cardboard into shape.

[0043] A ventilation mechanism is provided at the top of the negative pressure box 16 to ventilate the negative pressure box 16.

[0044] The fixing mechanism is set on one side of the base frame 1 to fix the cardboard.

[0045] Example 2

[0046] Improvements based on Example 1: See Appendix Figures 1-6 ,include:

[0047] The base frame 1 has an L-shaped bracket 3 fixedly connected to its surface. A cylinder 4 is fixedly connected to the top of the bracket 3. One end of the piston rod of the cylinder 4 slides through the top of the bracket 3. A protective shell is also fixedly connected to the top of the bracket 3. The cylinder 4 is located inside the protective shell and is protected by the protective shell. A pressure plate 13 is fixedly connected to the circumference of the piston rod of the cylinder 4. A negative pressure box 16 is installed at the bottom of the pressure plate 13. Before the cardboard is pressed, the air in the negative pressure box 16 is reduced, thereby reducing the air in the three-dimensional pattern after the cardboard is pressed, improving the pressing effect and the retention time of the three-dimensional pattern. Multiple connecting components are provided between the negative pressure box 16 and the pressure plate 13. A set of storage boxes 8 is provided at the bottom of the base frame 1 for collecting tools.

[0048] One end of the piston rod of cylinder 4 is fixedly connected to an upper mold 17, and the upper surface of the base frame 1 is fixedly connected to a lower mold 2 that works with the upper mold 17. The upper mold 17 and the lower mold 2 work together to press the cardboard into shape.

[0049] A ventilation mechanism is provided at the top of the negative pressure box 16 to ventilate the negative pressure box 16.

[0050] The fixing mechanism is set on one side of the base frame 1 to fix the cardboard.

[0051] Reference Figure 3 The connecting assembly includes a guide rod 14, which is fixedly connected to the top of the negative pressure box 16. The guide rod 14 slides through the pressure plate 13. A first spring 15 is sleeved on the circumference of the guide rod 14. The top and bottom of the first spring 15 are fixed to the pressure plate 13 and the negative pressure box 16, respectively. The first spring 15 can reset the negative pressure box 16 after it has been moved.

[0052] Reference Figure 4 The ventilation mechanism includes a negative pressure pipe 18 and a U-shaped positioning frame 5. The negative pressure pipe 18 is fixedly connected to the top of the negative pressure box 16. A ventilation chamber 19 is provided around the circumference of the negative pressure pipe 18. A guide frame 20 is fixedly connected to the inner wall of the ventilation chamber 19. A through slide rod 21 is slidably connected to the top of the guide frame 20. A first piston 22 is fixedly connected to the bottom of the slide rod 21. The first piston 22 is slidably connected to the negative pressure pipe 18. A second spring 23 is sleeved around the circumference of the slide rod 21. The top and bottom of the second spring 23 are fixed to the guide frame 20 and the first piston 22, respectively. The positioning frame 5 is fixedly connected to the surface of the base frame 1. A push rod 6 is fixedly connected to the top of the positioning frame 5. The push rod 6 is located below the first piston 22 and pushes the first piston 22. After the negative pressure box 16 contacts the surface of the base frame 1, the push rod 6 abuts against the bottom of the first piston 22, pushing the first piston 22 into the ventilation chamber 19, thereby drawing out the air in the negative pressure box 16.

[0053] Reference Figure 5 The ventilation mechanism also includes a fixing rod 24 and an air inlet 27. The fixing rod 24 is fixedly connected to the top of the upper mold 17. A thin rod 25 is fixedly connected to the top of the fixing rod 24. A plug 26 is fixedly connected to the top of the thin rod 25. The air inlet 27 is opened on the top of the negative pressure box 16 and works in conjunction with the plug 26. The diameter of the thin rod 25 is smaller than the diameter of the air inlet 27. The plug 26 can be used to seal the air inlet 27. At the same time, when the upper mold 17 is reset, the air inlet 27 can be opened to facilitate the movement of the negative pressure box 16.

[0054] Reference Figure 2 A slider 10 is fixedly connected to one side of the negative pressure box 16, and a through slide 9 is provided on one side of the bracket 3. The slider 10 is slidably connected to the slide 9, and the stability of the movement of the negative pressure box 16 is improved by the slider 10.

[0055] Reference Figure 6The fixing mechanism includes an air tube 28, which is fixedly penetrates the surface of the base frame 1. A second piston 33 is slidably connected to the inner circumference of the air tube 28. A third spring 34 is fixedly connected between the bottom of the second piston 33 and the bottom of the air tube 28. A pressure rod 32 is fixedly connected to the top of the second piston 33. The top of the pressure rod 32 slides through the top of the air tube 28. The pressure rod 32 is located below the slider 10 and works in conjunction with the slider 10. A multi-port pipe 29 is fixedly connected to one side of the air tube 28. Multiple air outlets of the multi-port pipe 29 are all fixedly connected. A connecting pipe 30 is fixedly connected to the top of the connecting pipe 30, and a suction cup 31 is fixedly connected to the top of the connecting pipe 30. The surface of the lower mold 2 has multiple through holes that cooperate with the suction cup 31. The suction cup 31 is located in the through holes. After the slider 10 contacts the pressure rod 32, the pressure rod 32 pushes the second piston 33 to move downward, thereby creating a negative pressure above the second piston 33. The pressure enters the suction cup 31 through the multi-port pipe 29 and the connecting pipe 30. The suction cup 31 adsorbs the cardboard and maintains the stability of the cardboard. The air pipe 28 has auxiliary air holes 35 on its circumference.

[0056] Reference Figure 3 The positioning frame 5 is fixedly connected to a first positioning plate 7 for positioning the side of the cardboard. The bracket 3 is threadedly connected to a threaded rod 11. The end of the threaded rod 11 near the lower mold 2 is rotatably connected to a second positioning plate 12. Rotating the threaded rod 11 can move the second positioning plate 12, improving the flexibility of positioning the cardboard.

[0057] This invention also proposes a processing technology for a packaging box three-dimensional pattern forming and pressing device, including the following steps:

[0058] S1: The negative pressure pipe 18 is connected to the external negative pressure tank through a flexible pipe. Rotate the threaded rod 11, which drives the second positioning plate 12 to move. Then, place the cardboard to be processed on the lower mold 2, keeping one side of the cardboard in contact with the first positioning plate 7 and the other side in contact with the second positioning plate 12. Then start the cylinder 4.

[0059] S2: Cylinder 4 drives the pressure plate 13, negative pressure box 16 and upper mold 17 to move downward. The negative pressure box 16 first contacts the surface of the base frame 1, and at the same time, the push rod 6 abuts against the bottom of the first piston 22, pushing the first piston 22 into the ventilation chamber 19, thereby drawing out the air in the negative pressure box 16. As cylinder 4 continues to start, the negative pressure box 16 remains stationary. The upper mold 17 continues to move downward, and through the fixed rod 24 and the thin rod 25, it drives the plug 26 to move downward, blocking the air inlet 27, so that the air in the negative pressure box 16 is under negative pressure. Then, the upper mold 17 cooperates with the lower mold 2 to press and form the cardboard.

[0060] S3: When the piston rod of cylinder 4 is reset, the upper mold 17 first drives the plug 26 to disengage from the air inlet 27, releasing the negative pressure state in the negative pressure box 16. Then the negative pressure box 16 is reset along with the piston rod of cylinder 4, while the first piston 22 remains to block the negative pressure pipe 18 under the push of the second spring 23.

[0061] S4: When the negative pressure box 16 moves downward, it drives the slider 10 to move downward. After the slider 10 contacts the pressure rod 32, the pressure rod 32 pushes the second piston 33 downward, thereby creating a negative pressure above the second piston 33. The pressure enters the suction cup 31 through the multi-port pipe 29 and the connecting pipe 30. The suction cup 31 adsorbs the cardboard and maintains the stability of the cardboard. When the cardboard is pressed, air enters the air pipe 28 through the auxiliary air hole 35. When the second piston 33 is reset, the air is sprayed out through the multi-port pipe 29 and the suction cup 31, thereby blowing the cardboard up, making it convenient for people to collect the cardboard.

[0062] It should be noted that in the description of this specification, descriptions such as "first" and "second" are only used to distinguish the features and do not have any actual order or directional meaning. This application is not limited to this.

[0063] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for forming and pressing three-dimensional patterns on packaging boxes, characterized in that, include: A base frame (1) is fixedly connected to an L-shaped bracket (3) on its surface. A cylinder (4) is fixedly connected to the top of the bracket (3). One end of the piston rod of the cylinder (4) slides through the top of the bracket (3). A pressure plate (13) is fixedly connected to the circumference of the piston rod of the cylinder (4). A negative pressure box (16) is installed at the bottom of the pressure plate (13). Multiple connecting components are provided between the negative pressure box (16) and the pressure plate (13). One end of the piston rod of the cylinder (4) is fixedly connected to the upper mold (17), and the upper surface of the base frame (1) is fixedly connected to the lower mold (2) that cooperates with the upper mold (17). A ventilation mechanism is provided on the top of the negative pressure box (16) to ventilate the negative pressure box (16); A fixing mechanism is provided on one side of the base frame (1) to fix the cardboard; The connecting assembly includes a guide rod (14), which is fixedly connected to the top of the negative pressure box (16). The guide rod (14) slides through the pressure plate (13). A first spring (15) is sleeved around the circumference of the guide rod (14). The top and bottom of the first spring (15) are fixed to the pressure plate (13) and the negative pressure box (16) respectively. The ventilation mechanism includes a negative pressure pipe (18) and a U-shaped positioning frame (5). The negative pressure pipe (18) is fixedly connected to the top of the negative pressure box (16). A ventilation chamber (19) is provided around the circumference of the negative pressure pipe (18). A guide frame (20) is fixedly connected to the inner wall of the ventilation chamber (19). A through slide rod (21) is slidably connected to the top of the guide frame (20). A first piston (22) is fixedly connected to the bottom of the slide rod (21). The first piston (22) is slidably connected to the negative pressure pipe (18). A second spring (23) is sleeved around the circumference of the slide rod (21). The top and bottom of the second spring (23) are fixed to the guide frame (20) and the first piston (22) respectively. The positioning frame (5) is fixedly connected to the surface of the base frame (1). A top rod (6) is fixedly connected to the top of the positioning frame (5). The top rod (6) is located below the first piston (22) and pushes the first piston (22).

2. The packaging box three-dimensional pattern forming and pressing device as described in claim 1, characterized in that, The ventilation mechanism also includes a fixed rod (24) and an air inlet (27). The fixed rod (24) is fixedly connected to the top of the upper mold (17). A thin rod (25) is fixedly connected to the top of the fixed rod (24). A plug (26) is fixedly connected to the top of the thin rod (25). The air inlet (27) is opened on the top of the negative pressure box (16) and works in conjunction with the plug (26). The diameter of the thin rod (25) is smaller than the diameter of the air inlet (27).

3. The packaging box three-dimensional pattern forming and pressing device as described in claim 2, characterized in that, A slider (10) is fixedly connected to one side of the negative pressure box (16), and a through slide (9) is provided on one side of the bracket (3). The slider (10) is slidably connected to the slide (9).

4. The packaging box three-dimensional pattern forming and pressing device as described in claim 3, characterized in that, The fixing mechanism includes an air pipe (28), which is fixedly penetrated through the surface of the base frame (1). A second piston (33) is slidably connected to the inner circumference of the air pipe (28). A third spring (34) is fixedly connected between the bottom of the second piston (33) and the bottom of the air pipe (28). A pressure rod (32) is fixedly connected to the top of the second piston (33). The top of the pressure rod (32) slides through the top of the air pipe (28). The pressure rod (32) is located below the slider (10) and works in cooperation with the slider (10). A multi-port pipe (29) is fixedly connected to one side of the air pipe (28). A connecting pipe (30) is fixedly connected to multiple air outlets of the multi-port pipe (29). A suction cup (31) is fixedly connected to the top of the connecting pipe (30). A plurality of perforations are opened on the surface of the lower mold (2) to cooperate with the suction cup (31). The suction cup (31) is located in the perforations. An auxiliary air hole (35) is opened on the circumference of the air pipe (28).

5. The packaging box three-dimensional pattern forming and pressing device as described in claim 4, characterized in that, The positioning frame (5) is fixedly connected to a first positioning plate (7) for positioning the side of the cardboard, and the bracket (3) is threadedly connected to a threaded rod (11) that passes through it. The end of the threaded rod (11) near the lower mold (2) is rotatably connected to a second positioning plate (12).

6. The packaging box three-dimensional pattern forming and pressing device as described in claim 5, characterized in that, The bottom of the base frame (1) is provided with a set of storage boxes (8).

7. The processing technology of the packaging box three-dimensional pattern forming and pressing device as described in claim 6, characterized in that, Includes the following steps: S1: The negative pressure pipe (18) is connected to the external negative pressure tank through a flexible pipe. Rotate the threaded rod (11), and the threaded rod (11) drives the second positioning plate (12) to move. Then, place the cardboard to be processed on the lower mold (2), keeping one side of the cardboard in contact with the first positioning plate (7) and the other side in contact with the second positioning plate (12). Then start the cylinder (4). S2: The cylinder (4) drives the pressure plate (13), negative pressure box (16) and upper mold (17) to move downward. The negative pressure box (16) first contacts the surface of the base frame (1), and at the same time, the push rod (6) abuts against the bottom of the first piston (22), pushing the first piston (22) into the ventilation chamber (19), thereby drawing out the air in the negative pressure box (16). As the cylinder (4) continues to start, the negative pressure box (16) remains stationary, and the upper mold (17) continues to move downward. It also drives the plug (26) to move downward through the fixed rod (24) and the thin rod (25) to block the air inlet (27), so that the air in the negative pressure box (16) is under negative pressure. Then, the upper mold (17) and the lower mold (2) cooperate to press and form the cardboard. S3: When the piston rod of the cylinder (4) is reset, the plug (26) is first driven away from the air inlet (27) by the upper mold (17) to release the negative pressure state in the negative pressure box (16). Then the negative pressure box (16) is reset with the piston rod of the cylinder (4), and the first piston (22) is kept blocking the negative pressure pipe (18) by the push of the second spring (23). S4: When the negative pressure box (16) moves downward, it drives the slider (10) to move downward. After the slider (10) contacts the pressure rod (32), it pushes the second piston (33) downward through the pressure rod (32), thereby creating a negative pressure above the second piston (33). The pressure enters the suction cup (31) through the multi-port pipe (29) and the connecting pipe (30). The suction cup (31) adsorbs the cardboard and maintains the stability of the cardboard. When the cardboard is pressed, air enters the air pipe (28) through the auxiliary air hole (35). When the second piston (33) is reset, the air is sprayed out through the multi-port pipe (29) and the suction cup (31), thereby blowing the cardboard up and making it convenient for people to collect the cardboard.

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