Packaging carton printing pre-pressing device

Abstract

The utility model relates to the technical field of packaging carton printing and pre-pressing, in particular to a packaging carton printing and pre-pressing device, which is characterized in that a paperboard is placed on a conveying mechanism, conveyed through the conveying mechanism, flattened through a flattening mechanism, and creased on the paperboard through a creasing mechanism. Then the paperboards are conveyed into the printing device, so that the practicability of the equipment is improved; comprising a conveying mechanism; the device further comprises a flattening mechanism and a creasing mechanism, the flattening mechanism is installed on the conveying mechanism, and the creasing mechanism is installed at the bottom of the conveying mechanism. The conveying mechanism is used for conveying a paperboard, the flattening mechanism is used for flattening the paperboard, and the creasing mechanism is used for creasing the paperboard.

Description

Technical Field

[0001] The utility model relates to the technical field of printing pre-pressing of packaging paper boxes, in particular to a printing pre-pressing device for packaging paper boxes. Background Art

[0002] Packaging cartons are a common packaging form for loading, protecting, displaying and transporting goods. They are made of cardboard, paper or other paper products. The cardboard needs to be printed during the processing of the packaging cartons. Existing printing machines, such as a packaging carton multi-color digital printing mechanism disclosed in the utility model patent with publication number CN220242744U and a packaging carton printing device based on a green and environmentally friendly process disclosed in the utility model patent with publication number CN212796215U, can both realize printing on packaging cartons.

[0003] However, it is found during use that the existing printing device has a relatively simple structure, which is inconvenient for pre-pressing the cardboard before printing, affecting the printing effect and resulting in poor practicality. Therefore, a packaging carton printing pre-pressing device is urgently needed. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a packaging paper box printing pre-pressing device, which places the cardboard on a conveying mechanism, conveys the cardboard through the conveying mechanism, flattens the cardboard through a flattening mechanism, presses creases on the cardboard through a creasing mechanism, and then conveys the cardboard to a printing device, thereby improving the practicality of the equipment.

[0005] The utility model discloses a packaging paper box printing pre-pressing device, comprising a conveying mechanism; a flattening mechanism and a creasing mechanism, wherein the flattening mechanism is installed on the conveying mechanism, and the creasing mechanism is installed at the bottom of the conveying mechanism;

[0006] The conveying mechanism conveys the cardboard, the flattening mechanism flattens the cardboard, and the indentation mechanism indents the cardboard;

[0007] The cardboard is placed on the conveying mechanism, conveyed by the conveying mechanism, flattened by the flattening mechanism, creases are pressed on the cardboard by the creasing mechanism, and then the cardboard is conveyed to the printing device, thereby improving the practicability of the equipment.

[0008] Preferably, the conveying mechanism includes a frame, two groups of first rotating shafts, two groups of second rotating shafts, multiple groups of first conveyor belts, second conveyor belts, a first motor and a second motor, the two groups of first rotating shafts and the two groups of second rotating shafts are rotatably installed on the frame, the multiple groups of first conveyor belts are sleeved on the two groups of first rotating shafts, the second conveyor belts are sleeved on the two groups of second rotating shafts, the first motor and the second motor are fixedly installed on the frame, and the first motor and the second motor provide power for one group of first rotating shafts and one group of second rotating shafts respectively; the cardboard is placed on the multiple groups of first conveyor belts, the first motor is turned on, and the two groups of first rotating shafts are driven to make the multiple groups of first conveyor belts transport the cardboard from right to left, which is convenient for the flattening mechanism and the indentation mechanism to flatten and indent the cardboard, and then the multiple groups of first conveyor belts transport the cardboard to the second conveyor belt, the second motor is turned on, and the two groups of second rotating shafts are driven to make the second conveyor belt send out the flattened and indented cardboard, thereby improving the practicability of the equipment.

[0009] Preferably, the creasing mechanism includes a first rolling mechanism and a second rolling mechanism, the first rolling mechanism is installed below the first conveyor belt, and the second rolling mechanism is installed on the first rolling mechanism; the front and rear parts of the bottom end of the cardboard are rolled by the first rolling mechanism, and the front and rear parts of the bottom end of the cardboard are rolled by the second rolling mechanism, thereby improving the practicability of the equipment.

[0010] Preferably, the first rolling mechanism includes multiple groups of first hydraulic cylinders, a lifting frame, a first slide rail, two groups of first sliders, two groups of first brackets, two groups of rolling wheels, a third motor and a forward and reverse lead screw, the multiple groups of first hydraulic cylinders are installed at the bottom end of the lifting frame, the first slide rail is installed at the top end of the lifting frame, the two groups of first sliders are slidably installed on the first slide rail, the third motor is installed at the front end of the first slide rail, one end of the forward and reverse lead screw is rotatably installed at the rear end of the first slide rail, the front end of the forward and reverse lead screw passes through the two groups of first sliders and is connected to the output shaft of the third motor, and the middle parts of the two groups of first sliders are The two groups of first brackets are respectively installed on the top ends of the two groups of first sliders, and the two groups of rolling wheels are respectively installed on the top ends of the two groups of first brackets, which are threadedly connected to the surfaces of the forward and reverse lead screws. The two groups of first sliders slide toward each other or in opposite directions on the first slide rails by turning on the third motor and are driven by the two groups of forward and reverse lead screws to adjust the positions of the two groups of rolling wheels. After that, the two groups of rolling wheels are extended by multiple groups of first hydraulic cylinders to pass through the gaps between the multiple groups of third motors. The two groups of rolling wheels roll the bottom end of the cardboard to form a crease at the bottom end of the cardboard, thereby improving the practicability of the equipment.

[0011] Preferably, the second rolling mechanism includes a fourth motor, an eccentric wheel, a collar, a second slider, a second bracket, a second rolling wheel, a connecting rod and a second slide rail. The fourth motor and the second slide rail are both installed on the top of the lifting frame. The eccentric wheel is installed on the output shaft of the fourth motor. The collar is rotatably sleeved on the eccentric wheel. The second slider is slidably installed on the second slide rail. The second rolling wheel is installed on the second slider through the second bracket. The second rolling wheel is located between the multiple groups of first conveyor belts and the second conveyor belts. One end of the connecting rod is hinged to the second bracket, and the other end of the connecting rod is hinged to the collar. Turn on the fourth motor to make the eccentric wheel rotate eccentrically, and the collar and the connecting rod cooperate to transmit the second slider, so that the second slider slides on the second slide rail and rolls the bottom end of the cardboard through the second rolling wheel, so that a crease is formed on the bottom end of the cardboard, thereby improving the practicability of the equipment.

[0012] Preferably, the flattening mechanism includes a driving mechanism and multiple groups of rolling shafts, the driving mechanism is installed on the frame, and the multiple groups of rolling shafts are rotatably installed on the driving mechanism; the height of the multiple groups of rolling shafts is adjusted by the driving mechanism, so that the multiple groups of rolling shafts roll the cardboards on the multiple groups of first conveyor belts and the second conveyor belts to flatten the cardboards, and the cardboards are squeezed downward by the multiple groups of rolling shafts, which facilitates the two groups of rolling wheels and the second rolling wheel to indent the bottom end of the cardboard, thereby improving the practicability of the equipment.

[0013] Preferably, the driving mechanism includes multiple groups of second hydraulic cylinders, lifting plates, multiple groups of third slide rails, multiple groups of third sliders and multiple groups of forward and reverse hydraulic cylinders. The lifting plates are installed on the frame through the multiple groups of second hydraulic cylinders. The multiple groups of third slide rails are installed on the bottom end of the lifting plates. The multiple groups of third sliders are respectively slidably installed on the multiple groups of third slide rails. The multiple groups of forward and reverse hydraulic cylinders are respectively installed on the multiple groups of third slide rails. The front ends and rear ends of the multiple groups of forward and reverse hydraulic cylinders are respectively connected to the multiple groups of third sliders. The multiple groups of rolling shafts are respectively rotatably installed on the multiple groups of third sliders. The multiple sets of second hydraulic cylinders are contracted to move the multiple sets of rolling shafts downward to roll the cardboard on the multiple sets of first conveyor belts and the second conveyor belts to flatten the cardboard. When flattening a large area of ​​cardboard, the middle of the cardboard is rolled by the multiple sets of rolling shafts, and then the cardboard with the flattened middle is placed on the multiple sets of first conveyor belts, so that the multiple sets of first conveyor belts and the second conveyor belts convey the cardboard again. At the same time, the multiple sets of positive and negative hydraulic cylinders are extended to roll the front and back of the cardboard by the multiple sets of rolling shafts, thereby improving the practicability of the equipment.

[0014] Compared with the prior art, the utility model has the following beneficial effects: placing the cardboard on the conveying mechanism, conveying the cardboard through the conveying mechanism, flattening the cardboard through the flattening mechanism, pressing creases on the cardboard through the creasing mechanism, and then conveying the cardboard to the printing device, thereby improving the practicability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a first axonometric structural schematic diagram of the utility model;

[0016] Figure 2 It is a second axonometric structural schematic diagram of the utility model;

[0017] Figure 3 It is a front view structural schematic diagram of the utility model;

[0018] Figure 4 It is an axonometric schematic diagram of the conveying mechanism and the flattening mechanism of the utility model;

[0019] Figure 5 It is a first axonometric enlarged structural schematic diagram of the indentation mechanism of the utility model;

[0020] Figure 6 It is a second axonometric enlarged structural schematic diagram of the indentation mechanism of the utility model.

[0021] Markings in the accompanying drawings: 1. frame; 2. first rotating shaft; 3. second rotating shaft; 4. first conveyor belt; 5. second conveyor belt; 6. first motor; 7. second motor; 8. first hydraulic cylinder; 9. lifting frame; 10. first slide rail; 11. first slider; 12. first bracket; 13. rolling wheel; 14. third motor; 15. forward and reverse screw; 16. fourth motor; 17. eccentric wheel; 18. collar; 19. second slider; 20. second bracket; 21. second rolling wheel; 22. connecting rod; 23. second slide rail; 24. rolling shaft; 25. second hydraulic cylinder; 26. lifting plate; 27. third slide rail; 28. third slider; 29. ​​forward and reverse hydraulic cylinder. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0023] Example 1

[0024] A packaging paper box printing pre-pressing device, comprising a conveying mechanism; a flattening mechanism and a creasing mechanism, wherein the flattening mechanism is installed on the conveying mechanism, and the creasing mechanism is installed at the bottom of the conveying mechanism;

[0025] The conveying mechanism conveys the cardboard, the flattening mechanism flattens the cardboard, and the indentation mechanism indents the cardboard;

[0026] The conveying mechanism includes a frame 1, two groups of first rotating shafts 2, two groups of second rotating shafts 3, multiple groups of first conveyor belts 4, second conveyor belts 5, a first motor 6 and a second motor 7, the two groups of first rotating shafts 2 and the two groups of second rotating shafts 3 are rotatably mounted on the frame 1, the multiple groups of first conveyor belts 4 are sleeved on the two groups of first rotating shafts 2, the second conveyor belts 5 are sleeved on the two groups of second rotating shafts 3, the first motor 6 and the second motor 7 are fixedly mounted on the frame 1, and the first motor 6 and the second motor 7 provide power for a group of first rotating shafts 2 and a group of second rotating shafts 3 respectively;

[0027] The indentation mechanism includes a first rolling mechanism and a second rolling mechanism, the first rolling mechanism is installed below the first conveyor belt 4, and the second rolling mechanism is installed on the first rolling mechanism;

[0028] The first rolling mechanism includes multiple groups of first hydraulic cylinders 8, a lifting frame 9, a first slide rail 10, two groups of first sliders 11, two groups of first brackets 12, two groups of rolling wheels 13, a third motor 14 and a forward and reverse screw 15. The multiple groups of first hydraulic cylinders 8 are all installed at the bottom end of the lifting frame 9, the first slide rail 10 is installed at the top end of the lifting frame 9, the two groups of first sliders 11 are all slidably installed on the first slide rail 10, the third motor 14 is installed at the front end of the first slide rail 10, one end of the forward and reverse screw 15 is rotatably installed at the rear end of the first slide rail 10, the front end of the forward and reverse screw 15 passes through the two groups of first sliders 11 and is connected to the output shaft of the third motor 14, and the middle parts of the two groups of first sliders 11 are both threadedly connected to the surface of the forward and reverse screw 15, the two groups of first brackets 12 are respectively installed at the top ends of the two groups of first sliders 11, and the two groups of rolling wheels 13 are respectively installed at the top ends of the two groups of first brackets 12;

[0029] The second rolling mechanism includes a fourth motor 16, an eccentric wheel 17, a collar 18, a second slider 19, a second bracket 20, a second rolling wheel 21, a connecting rod 22 and a second slide rail 23. The fourth motor 16 and the second slide rail 23 are both installed at the top of the lifting frame 9. The eccentric wheel 17 is installed on the output shaft of the fourth motor 16. The collar 18 is rotatably sleeved on the eccentric wheel 17. The second slider 19 is slidably installed on the second slide rail 23. The second rolling wheel 21 is installed on the second slider 19 through the second bracket 20, and the second rolling wheel 21 is located between the multiple groups of first conveyor belts 4 and the second conveyor belts 5. One end of the connecting rod 22 is hinged to the second bracket 20, and the other end of the connecting rod 22 is hinged to the collar 18.

[0030] The cardboard is placed on the multiple groups of first conveyor belts 4, the first motor 6 is turned on, and the multiple groups of first rotating shafts 2 are driven to make the multiple groups of first conveyor belts 4 convey the cardboard from right to left. At the same time, the third motor 14 is turned on, and the two groups of forward and reverse screws 15 are driven to make the two groups of first slide blocks 11 slide towards each other or slide in opposite directions on the first slide rails 10, and the positions of the two groups of rolling wheels 13 are adjusted. After that, the multiple groups of first hydraulic cylinders 8 are extended to make the two groups of rolling wheels 13 pass through the gaps between the multiple groups of third motors 14. , two groups of rolling wheels 13 are used to roll the bottom end of the cardboard, so that creases are formed on the front and rear parts of the bottom end of the cardboard, and then the first conveyor belt 4 is used to convey the cardboard to the second conveyor belt 5, and at the same time, the fourth motor 16 is turned on to make the eccentric wheel 17 rotate eccentrically, and the second slider 19 slides on the second slide rail 23 through the second rolling wheel 21 to roll the bottom end of the cardboard, so that creases are formed on the left and right parts of the bottom end of the cardboard, thereby improving the practicality of the equipment.

[0031] Example 2

[0032] like Figures 1 to 6 As shown, a packaging paper box printing pre-pressing device includes a conveying mechanism; a flattening mechanism and a creasing mechanism, wherein the flattening mechanism is installed on the conveying mechanism, and the creasing mechanism is installed at the bottom of the conveying mechanism;

[0033] The conveying mechanism conveys the cardboard, the flattening mechanism flattens the cardboard, and the indentation mechanism indents the cardboard;

[0034] The conveying mechanism includes a frame 1, two groups of first rotating shafts 2, two groups of second rotating shafts 3, multiple groups of first conveyor belts 4, second conveyor belts 5, a first motor 6 and a second motor 7, the two groups of first rotating shafts 2 and the two groups of second rotating shafts 3 are rotatably mounted on the frame 1, the multiple groups of first conveyor belts 4 are sleeved on the two groups of first rotating shafts 2, the second conveyor belts 5 are sleeved on the two groups of second rotating shafts 3, the first motor 6 and the second motor 7 are fixedly mounted on the frame 1, and the first motor 6 and the second motor 7 provide power for a group of first rotating shafts 2 and a group of second rotating shafts 3 respectively;

[0035] The indentation mechanism includes a first rolling mechanism and a second rolling mechanism, the first rolling mechanism is installed below the first conveyor belt 4, and the second rolling mechanism is installed on the first rolling mechanism;

[0036] The first rolling mechanism includes multiple groups of first hydraulic cylinders 8, a lifting frame 9, a first slide rail 10, two groups of first sliders 11, two groups of first brackets 12, two groups of rolling wheels 13, a third motor 14 and a forward and reverse screw 15. The multiple groups of first hydraulic cylinders 8 are all installed at the bottom end of the lifting frame 9, the first slide rail 10 is installed at the top end of the lifting frame 9, the two groups of first sliders 11 are all slidably installed on the first slide rail 10, the third motor 14 is installed at the front end of the first slide rail 10, one end of the forward and reverse screw 15 is rotatably installed at the rear end of the first slide rail 10, the front end of the forward and reverse screw 15 passes through the two groups of first sliders 11 and is connected to the output shaft of the third motor 14, and the middle parts of the two groups of first sliders 11 are both threadedly connected to the surface of the forward and reverse screw 15, the two groups of first brackets 12 are respectively installed at the top ends of the two groups of first sliders 11, and the two groups of rolling wheels 13 are respectively installed at the top ends of the two groups of first brackets 12;

[0037] The second rolling mechanism includes a fourth motor 16, an eccentric wheel 17, a collar 18, a second slider 19, a second bracket 20, a second rolling wheel 21, a connecting rod 22 and a second slide rail 23. The fourth motor 16 and the second slide rail 23 are both installed at the top of the lifting frame 9. The eccentric wheel 17 is installed on the output shaft of the fourth motor 16. The collar 18 is rotatably sleeved on the eccentric wheel 17. The second slider 19 is slidably installed on the second slide rail 23. The second rolling wheel 21 is installed on the second slider 19 through the second bracket 20, and the second rolling wheel 21 is located between the multiple groups of first conveyor belts 4 and the second conveyor belts 5. One end of the connecting rod 22 is hinged to the second bracket 20, and the other end of the connecting rod 22 is hinged to the collar 18.

[0038] The flattening mechanism includes a driving mechanism and a plurality of rolling shafts 24, the driving mechanism is mounted on the frame 1, and the plurality of rolling shafts 24 are rotatably mounted on the driving mechanism;

[0039] The driving mechanism includes multiple groups of second hydraulic cylinders 25, lifting plates 26, multiple groups of third slide rails 27, multiple groups of third sliders 28 and multiple groups of forward and reverse hydraulic cylinders 29. The lifting plates 26 are mounted on the frame 1 through multiple groups of second hydraulic cylinders 25. Multiple groups of third slide rails 27 are mounted on the bottom of the lifting plates 26. Multiple groups of third sliders 28 are respectively slidably mounted on the multiple groups of third slide rails 27. Multiple groups of forward and reverse hydraulic cylinders 29 are respectively mounted on the multiple groups of third slide rails 27. The front ends and rear ends of the multiple groups of forward and reverse hydraulic cylinders 29 are respectively connected to the multiple groups of third sliders 28. The multiple groups of rolling shafts 24 are respectively rotatably mounted on the multiple groups of third sliders 28.

[0040] The cardboard is placed on the multiple groups of first conveyor belts 4, and the first motor 6 is turned on. The multiple groups of first rotating shafts 2 are driven to make the multiple groups of first conveyor belts 4 transport the cardboard from right to left. At the same time, the multiple groups of second hydraulic cylinders 25 are contracted to make the multiple groups of rolling shafts 24 move downward to roll the cardboard on the multiple groups of first conveyor belts 4 and the second conveyor belts 5 to flatten the cardboard. Then, the third motor 14 is turned on. The two groups of forward and reverse lead screws 15 are driven to make the two groups of first slide blocks 11 slide toward each other or in opposite directions on the first slide rails 10 to adjust the positions of the two groups of rolling wheels 13. After that, the multiple groups of first hydraulic cylinders 8 are extended to make the two groups of rolling wheels 13 pass through the gaps between the multiple groups of third motors 14. The two groups of rolling wheels 13 roll on the bottom end of the cardboard to make the front and the bottom end of the cardboard A crease is formed on the rear part, and then the first conveyor belt 4 is grouped to convey the cardboard to the second conveyor belt 5. At the same time, the fourth motor 16 is turned on to make the eccentric wheel 17 rotate eccentrically, and the second slider 19 slides on the second slide rail 23 through the second rolling wheel 21 to roll the bottom end of the cardboard, so that creases are formed on the left and right parts of the bottom end of the cardboard. When flattening a large area of ​​cardboard, the middle part of the cardboard is rolled by multiple groups of rolling shafts 24, and then the flattened cardboard in the middle is placed on multiple groups of first conveyor belts 4, so that multiple groups of first conveyor belts 4 and second conveyor belts 5 convey the cardboard again, and at the same time, multiple groups of positive and negative hydraulic cylinders 29 are extended to make multiple groups of rolling shafts 24 roll the front and rear of the cardboard, thereby improving the practicality of the equipment.

[0041] The first motor 6, the second motor 7, the first hydraulic cylinder 8, the third motor 14, the fourth motor 16, the second hydraulic cylinder 25 and the forward and reverse hydraulic cylinder 29 of the packaging paper box printing pre-pressing device of the utility model are purchased on the market. The technicians in the industry only need to install and operate them according to the accompanying instruction manual, without the need for the technicians in this field to make creative labor.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A packaging carton printing pre-pressing device, comprising a conveying mechanism; characterized in that: It also includes a flattening mechanism and an indentation mechanism, wherein the flattening mechanism is installed on the conveying mechanism, and the indentation mechanism is installed at the bottom of the conveying mechanism; The conveying mechanism conveys the paperboard, the flattening mechanism flattens the paperboard, and the indentation mechanism indents the paperboard.

2. A packaging carton printing pre-pressing device as claimed in claim 1, characterized in that: The conveying mechanism comprises a frame (1), two groups of first rotating shafts (2), two groups of second rotating shafts (3), multiple groups of first conveyor belts (4), second conveyor belts (5), a first motor (6) and a second motor (7); the two groups of first rotating shafts (2) and the two groups of second rotating shafts (3) are rotatably mounted on the frame (1); the multiple groups of first conveyor belts (4) are sleeved on the two groups of first rotating shafts (2); the second conveyor belts (5) are sleeved on the two groups of second rotating shafts (3); the first motor (6) and the second motor (7) are fixedly mounted on the frame (1); and the first motor (6) and the second motor (7) respectively provide power for one group of first rotating shafts (2) and one group of second rotating shafts (3).

3. A packaging carton printing pre-pressing device as claimed in claim 2, characterized in that: The indentation mechanism comprises a first rolling mechanism and a second rolling mechanism, wherein the first rolling mechanism is installed below the first conveyor belt (4), and the second rolling mechanism is installed on the first rolling mechanism.

4. A packaging carton printing pre-pressing device as claimed in claim 3, characterized in that: The first rolling mechanism comprises a plurality of first hydraulic cylinders (8), a lifting frame (9), a first slide rail (10), two first slide blocks (11), two first brackets (12), two rolling wheels (13), a third motor (14) and a forward and reverse lead screw (15); the plurality of first hydraulic cylinders (8) are mounted on the bottom end of the lifting frame (9); the first slide rail (10) is mounted on the top end of the lifting frame (9); the two first slide blocks (11) are slidably mounted on the first slide rail (10); the third motor (14) is mounted on The front end of the first slide rail (10) and one end of the forward and reverse lead screw (15) are rotatably mounted on the rear end of the first slide rail (10); the front end of the forward and reverse lead screw (15) passes through the two groups of first sliders (11) and is connected to the output shaft of the third motor (14); and the middle parts of the two groups of first sliders (11) are both threadedly connected to the surface of the forward and reverse lead screw (15); the two groups of first brackets (12) are respectively mounted on the top ends of the two groups of first sliders (11); and the two groups of rolling wheels (13) are respectively mounted on the top ends of the two groups of first brackets (12).

5. A packaging carton printing pre-pressing device as claimed in claim 4, characterized in that: The second rolling mechanism comprises a fourth motor (16), an eccentric wheel (17), a collar (18), a second slider (19), a second bracket (20), a second rolling wheel (21), a connecting rod (22) and a second slide rail (23). The fourth motor (16) and the second slide rail (23) are both mounted on the top of the lifting frame (9). The eccentric wheel (17) is mounted on the output shaft of the fourth motor (16). The collar (18) is rotatably mounted on the eccentric wheel (17). The second slider (19) is slidably mounted on the second slide rail (23). The second rolling wheel (21) is mounted on the second slider (19) through the second bracket (20). The second rolling wheel (21) is located between the plurality of first conveyor belts (4) and the second conveyor belts (5). One end of the connecting rod (22) is hinged to the second bracket (20), and the other end of the connecting rod (22) is hinged to the collar (18).

6. A packaging carton printing pre-pressing device as claimed in claim 2, characterized in that: The flattening mechanism comprises a driving mechanism and a plurality of rolling shafts (24); the driving mechanism is mounted on a frame (1); and the plurality of rolling shafts (24) are rotatably mounted on the driving mechanism.

7. A packaging carton printing pre-pressing device as claimed in claim 6, characterized in that: The driving mechanism comprises a plurality of groups of second hydraulic cylinders (25), a lifting plate (26), a plurality of groups of third slide rails (27), a plurality of groups of third sliders (28) and a plurality of groups of forward and reverse hydraulic cylinders (29); the lifting plate (26) is mounted on the frame (1) through the plurality of groups of second hydraulic cylinders (25); the plurality of groups of third slide rails (27) are mounted on the bottom end of the lifting plate (26); the plurality of groups of third sliders (28) are respectively slidably mounted on the plurality of groups of third slide rails (27); the plurality of groups of forward and reverse hydraulic cylinders (29) are respectively mounted on the plurality of groups of third slide rails (27); the front ends and rear ends of the plurality of groups of forward and reverse hydraulic cylinders (29) are respectively connected to the plurality of groups of third sliders (28); and the plurality of groups of rolling shafts (24) are respectively rotatably mounted on the plurality of groups of third sliders (28).

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