A carton creasing device

Abstract

The utility model discloses a carton creasing device, which relates to the technical field of carton production, including a creasing mechanism, and also includes: a conveying component, the conveying component includes a conveyor belt, the outer surface of the conveyor belt is provided with a transport groove matching the outer contour of the cardboard, and the depth of the transport groove matches the thickness of the cardboard, and the transport groove is provided with a plurality of intervals; a guide conveying roller component, which is arranged at the discharge end of the conveyor belt and can guide and convey the cardboard; the creasing mechanism is arranged at the discharge end of the guide conveying roller component; a limiter component, which is arranged above the feed end of the conveyor belt, the bottom end of the limiter component is in sliding contact with the surface of the conveyor belt, the paper stack is located on the conveyor belt, and the limiter component is in contact with both sides of the paper stack and one side close to the discharge end of the conveyor belt. The utility model provides a carton creasing device, which can improve the accuracy of creasing.

Description

Technical Field

[0001] The utility model relates to the technical field of carton production, in particular to a carton creasing device. Background Art

[0002] During the production process of cartons, corresponding indentations need to be pressed on the cardboard to facilitate processes such as stapling or gluing the cartons, which requires the use of a carton indentation device.

[0003] However, the indentations made by existing indentation devices have low precision, that is, the indentations are often skewed or the actual indentation position is different from the required indentation position. The inventor believes that this is because the cardboard is not positioned or limited during the transmission process, causing the cardboard to deviate.

[0004] For example, the patent with announcement number CN208247581U can adjust the indentation depth of the cardboard conveniently and quickly; the patent with announcement number CN219727356U can collect the cardboard in a unified manner, thereby improving work efficiency; both of the above patents have the defect that the cardboard is not positioned or limited during the transmission process, resulting in skewed indentation or the actual indentation position is different from the required indentation position.

[0005] Therefore, it is necessary to develop a carton creasing device to address the above defects. Utility Model Content

[0006] The utility model aims to provide a carton creasing device which can improve the creasing accuracy.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] The utility model provides a carton creasing device, comprising a creasing mechanism, and further comprising:

[0009] A conveying assembly, the conveying assembly comprises a conveyor belt, the outer surface of the conveyor belt is provided with a conveying groove matching the outer contour of the cardboard, and the depth of the conveying groove matches the thickness of the cardboard, and the conveying groove is provided with a plurality of intervals;

[0010] A guide conveying roller assembly is arranged at the discharge end of the conveyor belt and is capable of guiding and conveying the cardboard; the creasing mechanism is arranged at the discharge end of the guide conveying roller assembly;

[0011] A limit assembly is arranged above the feeding end of the conveyor belt, the bottom end of the limit assembly is in sliding contact with the surface of the conveyor belt, the paper stack is located on the conveyor belt, and the limit assembly is in contact with both sides of the paper stack and one side close to the discharging end of the conveyor belt.

[0012] Furthermore, the conveying assembly also includes a U-shaped frame, a rotating shaft, a first reduction motor and a supporting assembly. The rotating shaft is rotatably mounted in the U-shaped frame, two rotating shafts are provided and are arranged at intervals, and the conveyor belt is mounted on the two rotating shafts. The first reduction motor is fixedly connected to the outer wall of the U-shaped frame, and the output shaft of the first reduction motor is coaxially fixedly connected to one end of any one of the rotating shafts; the supporting assembly is located below the limiting assembly, the supporting assembly is mounted in the U-shaped frame and is located in the inner cavity of the conveyor belt, and the upper surface of the supporting assembly is in contact with the conveyor belt.

[0013] Furthermore, the support assembly includes a support rod, both ends of which are rotatably connected to the side walls of the U-shaped frame, the circumferential surface of the support rod is in sliding contact with the conveyor belt, and a plurality of the support rods are arranged in parallel at intervals.

[0014] Furthermore, the limiting assembly includes a baffle and a sorting assembly, a top plate is arranged above the U-shaped frame, the baffle and the sorting assembly are both fixed on the lower surface of the top plate, the baffle contacts the side of the paper stack close to the discharge end of the conveyor belt, the projections of the sorting assembly and the conveyor belt on the horizontal plane are perpendicular to each other, and the sorting assembly contacts both sides of the paper stack, and the bottom ends of the baffle and the sorting assembly are both in sliding contact with the surface of the conveyor belt.

[0015] Furthermore, the sorting component includes two limit rods and a guide rod, two support plates are symmetrically fixed on the lower surface of the top plate, the guide rod is fixedly mounted between the two support plates, and the projections of the guide rod and the conveyor belt on the horizontal plane are perpendicular to each other, the guide rod slides through the two limit rods, the two limit rods are respectively located on both sides of the paper stack and the opposite surfaces of the two limit rods are respectively in contact with the corresponding side surfaces of the paper stack, and the bottom end of the limit rod is in sliding contact with the surface of the conveyor belt; a driving assembly is installed on the two support plates, and the driving assembly can drive the two limit rods to move away from or towards each other.

[0016] Furthermore, the driving assembly includes a bidirectional screw and a second reduction motor, both ends of the bidirectional screw are provided with threads with opposite rotation directions, the bidirectional screw is rotatably mounted between the two support plates, the threaded segment at one end of the bidirectional screw passes through the corresponding limit rod and is threadedly connected, the threaded segment at the other end of the bidirectional screw passes through the other limit rod and is threadedly connected, the second reduction motor is fixedly connected to any one of the support plates, and the output shaft of the second reduction motor is coaxially fixedly connected to one end of the bidirectional screw.

[0017] Furthermore, the guide conveying roller assembly includes a mounting plate and a roller shaft, two mounting plates are symmetrically arranged at intervals and are respectively fixedly connected to the side walls of the U-shaped frame, the roller shaft is rotatably mounted between the two mounting plates, two roller shafts are arranged at intervals above and below, the gap between the two roller shafts is arranged corresponding to the discharge end of the conveyor belt, and the distance between the opposite surfaces of the two roller shafts is equal to the thickness of the cardboard; a third reduction motor is installed on any of the mounting plates, and the output shaft of the third reduction motor is coaxially fixedly connected to one end of any of the roller shafts, the ends of the two roller shafts away from the third reduction motor both pass through the mounting plate and the ends are fixedly connected with gears, and the two gears are meshed.

[0018] Furthermore, the indentation mechanism includes an upper die shaft and a lower die shaft, the lower die shaft is rotatably mounted between the two mounting plates, a lifting assembly is installed on each mounting plate, the upper die shaft is rotatably mounted between the two lifting assemblies, the upper die shaft is located above the lower die shaft, an upper pressure wheel is coaxially fixedly connected to the upper die shaft, a lower pressure wheel is coaxially fixedly connected to the lower die shaft, the upper pressure wheel and the lower pressure wheel are concavely and convexly matched and the matching portion is arranged corresponding to the gap between the two roller shafts; a fourth reduction motor is fixed on any of the mounting plates, and the output shaft of the fourth reduction motor is coaxially and fixedly connected to one end of the lower die shaft.

[0019] Furthermore, the lifting assembly includes a gantry, a slider and a threaded rod, the gantries are provided with two and are arranged one-to-one with the mounting plates, the gantry is fixedly connected to the corresponding mounting plates, the sliders are provided with two and are arranged one-to-one with the gantry, the sliders are located in the corresponding gantry, and the sliders are vertically slidably connected to the two vertical walls of the gantry, each horizontal wall of the gantry is vertically provided with a threaded through hole, the threaded rods are provided with two and are arranged one-to-one with the gantry, and the threaded rods are threadedly connected to the corresponding threaded through holes on the gantry, a nut is fixed to the top of the threaded rod, and the bottom of the threaded rod is clamped and rotatably engaged with the top of the slider.

[0020] Furthermore, a circular groove is provided at the top of the slider, the diameter of the circular groove is larger than the diameter of the threaded rod, and a circular disc matching the circular groove is integrally formed at the bottom end of the threaded rod, the circular disc is rotatably connected to the circular groove, a flange plate is fixedly connected to the top of the slider, and the threaded rod rotatably passes through the flange plate.

[0021] Compared with the prior art, the beneficial technical effects of the utility model are:

[0022] The utility model provides a carton creasing device. Since the limiting assembly limits the paper stack, the paper stack will not move or shake at will, thereby ensuring that the cardboard at the bottom of the paper stack can correctly enter the transport trough. The transport trough limits the cardboard, and the guiding and conveying function of the guide conveying roller assembly prevents the cardboard from moving at will during the conveying process. In summary, it is ensured that the cardboard will not deviate during the conveying process, effectively avoiding the phenomenon of crooked creasing or the actual creasing position being different from the required creasing position, thereby improving the creasing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0025] Figure 2 It is a three-dimensional structural schematic diagram of the utility model from another angle;

[0026] Figure 3 It is a three-dimensional structural schematic diagram of the utility model from another angle;

[0027] Figure 4 It is a cross-sectional structural schematic diagram of the utility model;

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the conveyor belt of the utility model;

[0029] Figure 6 This is a schematic diagram of the exploded structure of the slider, threaded rod and flange plate of the utility model.

[0030] Explanation of the reference numerals: 1. conveyor belt; 101. transport trough; 2. U-shaped frame; 3. rotating shaft; 4. cardboard; 5. paper stack; 6. first reduction motor; 7. support rod; 8. top plate; 9. baffle; 10. limit rod; 11. guide rod; 12. bidirectional screw; 13. second reduction motor; 14. mounting plate; 15. roller shaft; 16. third reduction motor; 17. gear; 18. upper mold shaft; 19. lower mold shaft; 20. fourth reduction motor; 21. gantry; 22. slider; 23. threaded rod; 24. flange plate. DETAILED DESCRIPTION

[0031] The core of the utility model is to provide a carton creasing device, which can improve the creasing accuracy.

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "middle", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0034] In a specific embodiment of the present invention, Figures 1 to 6 As shown, it includes an indentation mechanism, and also includes a transmission component, a guide conveying roller component and a limit component;

[0035] The conveying assembly includes a conveyor belt 1, the outer surface of the conveyor belt 1 is provided with a conveying groove 101 matching the outer contour of the cardboard 4, and the depth of the conveying groove 101 matches the thickness of the cardboard 4, and the conveying groove 101 is provided with a plurality of intervals;

[0036] The guide conveying roller assembly is arranged at the discharge end of the conveyor belt 1 and is capable of guiding and conveying the cardboard 4; the creasing mechanism is arranged at the discharge end of the guide conveying roller assembly;

[0037] The limiting component is arranged above the feed end of the conveyor belt 1, and the bottom end of the limiting component is in sliding contact with the surface of the conveyor belt 1. The paper stack 5 is located on the conveyor belt 1, and the limiting component is in contact with both sides of the paper stack 5 and the side close to the discharge end of the conveyor belt 1.

[0038] Specifically, when the conveyor belt 1 passes under the paper stack 5, the cardboard 4 at the bottom of the paper stack 5 enters the transport trough 101, and then the cardboard 4 continues to move with the conveyor belt 1 to the guide conveying roller assembly, and the guide conveying roller assembly guides the cardboard 4 to the indentation mechanism, and the indentation mechanism indents the cardboard 4. Since the limiting assembly limits the paper stack 5, the paper stack 5 will not move or shake at will, thereby ensuring that the cardboard 4 at the bottom of the paper stack 5 can correctly enter the transport trough 101, and the transport trough 101 limits the cardboard 4, and the guiding and conveying function of the guide conveying roller assembly prevents the cardboard 4 from moving at will during the conveying process. In summary, it is ensured that the cardboard 4 will not deviate during the conveying process, and the phenomenon of skewed indentation or the actual indentation position being different from the required indentation position is effectively avoided, thereby improving the indentation accuracy.

[0039] The conveying assembly also includes a U-shaped frame 2, a rotating shaft 3, a first reduction motor 6 and a support assembly. The rotating shaft 3 is rotatably mounted in the U-shaped frame 2. Two rotating shafts 3 are provided and are spaced apart. The conveyor belt 1 is sleeved on the two rotating shafts 3. The first reduction motor 6 is fixedly connected to the outer wall of the U-shaped frame 2. The output shaft of the first reduction motor 6 is coaxially fixedly connected to one end of any rotating shaft 3. The support assembly is located below the limit assembly. The support assembly is mounted in the U-shaped frame 2 and is located in the inner cavity of the conveyor belt 1. The upper surface of the support assembly is in contact with the conveyor belt 1. Specifically, the first reduction motor 6 drives the rotating shaft 3 connected thereto to rotate, and the rotating shaft 3 drives the conveyor belt 1 to run. The support assembly is used to support the conveyor belt 1 to prevent the paper stack 5 from bending the conveyor belt 1.

[0040] The support assembly includes a support rod 7, both ends of which are rotatably connected to the side walls of the U-shaped frame 2, the circumferential surface of the support rod 7 is in sliding contact with the conveyor belt 1, and a plurality of support rods 7 are arranged in parallel at intervals. Specifically, the support rod 7 can rotate under the friction of the conveyor belt 1, thereby reducing the wear of the conveyor belt 1.

[0041] The limiting assembly includes a baffle 9 and a sorting assembly. A top plate 8 is mounted above the U-shaped frame 2. The baffle 9 and the sorting assembly are both fixed on the lower surface of the top plate 8. The baffle 9 contacts one side of the paper stack 5 close to the discharge end of the conveyor belt 1. The projections of the sorting assembly and the conveyor belt 1 on the horizontal plane are perpendicular to each other, and the sorting assembly contacts both sides of the paper stack 5. The bottom ends of the baffle 9 and the sorting assembly are both in sliding contact with the surface of the conveyor belt 1.

[0042] The sorting component includes two limit rods 10 and a guide rod 11. Two support plates are symmetrically fixed on the lower surface of the top plate 8. The guide rod 11 is fixedly mounted between the two support plates, and the projections of the guide rod 11 and the conveyor belt 1 on the horizontal plane are perpendicular to each other. The guide rod 11 slides through the two limit rods 10. The two limit rods 10 are respectively located on both sides of the paper stack 5, and the opposite surfaces of the two limit rods 10 are respectively in contact with the corresponding side surfaces of the paper stack 5, and the bottom end of the limit rod 10 is in sliding contact with the surface of the conveyor belt 1; a driving component is installed on the two support plates, and the driving component can drive the two limit rods 10 to move away from or towards each other.

[0043] Specifically, the paper stack 5 is limited by the baffle 9 and the two limiting rods 10, so that the paper stack 5 does not move or shake at will. After replacing the conveyor belt 1 with different transport troughs 101, the relative distance between the two limiting rods 10 is adjusted by the driving assembly to match the width of the transport trough 101, so that the sorting assembly can be suitable for transport troughs 101 of various specifications.

[0044] The driving assembly includes a bidirectional screw 12 and a second reduction motor 13. The two ends of the bidirectional screw 12 are provided with threads with opposite rotation directions. The bidirectional screw 12 is rotatably mounted between the two support plates. The threaded section at one end of the bidirectional screw 12 penetrates the corresponding limiting rod 10 and is threadedly connected. The threaded section at the other end of the bidirectional screw 12 penetrates the other limiting rod 10 and is threadedly connected. The second reduction motor 13 is fixedly connected to any supporting plate, and the output shaft of the second reduction motor 13 is coaxially fixedly connected to one end of the bidirectional screw 12. Specifically, when the second reduction motor 13 drives the bidirectional screw 12 to rotate forward or reverse, the bidirectional screw 12 drives the two limiting rods 10 to move away from or towards each other.

[0045] The guide conveying roller assembly includes a mounting plate 14 and a roller shaft 15. The mounting plates 14 are symmetrically provided with two roller shafts 15 and are fixedly connected to the side walls of the U-shaped frame 2. The roller shaft 15 is rotatably mounted between the two mounting plates 14. Two roller shafts 15 are provided at intervals above and below. The gap between the two roller shafts 15 is arranged corresponding to the discharge end of the conveyor belt 1, and the distance between the opposite surfaces of the two roller shafts 15 is equal to the thickness of the cardboard 4. A third reduction motor 16 is installed on any mounting plate 14. The output shaft of the third reduction motor 16 is coaxially fixedly connected to one end of any roller shaft 15. The ends of the two roller shafts 15 away from the third reduction motor 16 penetrate the mounting plate 14 and the ends are fixedly connected to the gears 17, and the two gears 17 are meshed. Specifically, the third reduction motor 16 drives the roller shaft 15 connected thereto to rotate, and the two roller shafts 15 rotate synchronously under the meshing action of the two gears 17, so that the cardboard 4 is transported from between the two roller shafts 15 to the creasing mechanism.

[0046] The indentation mechanism includes an upper die shaft 18 and a lower die shaft 19. The lower die shaft 19 is rotatably mounted between two mounting plates 14. A lifting assembly is installed on each mounting plate 14. The upper die shaft 18 is rotatably mounted between the two lifting assemblies. The upper die shaft 18 is located above the lower die shaft 19. An upper pressing wheel is coaxially fixedly connected to the upper die shaft 18, and a lower pressing wheel is coaxially fixedly connected to the lower die shaft 19. The upper pressing wheel and the lower pressing wheel are concavely and convexly matched, and the matching portion is arranged corresponding to the gap between the two roller shafts 15. A fourth reduction motor 20 is fixed on any mounting plate 14, and the output shaft of the fourth reduction motor 20 is coaxially and fixedly connected to one end of the lower die shaft 19.

[0047] The lifting assembly includes a gantry 21, a slider 22 and a threaded rod 23. Two gantries 21 are provided and are arranged one-to-one with the mounting plates 14. The gantry 21 is fixedly connected to the corresponding mounting plates 14. Two sliders 22 are provided and are arranged one-to-one with the gantry 21. The slider 22 is located in the corresponding gantry 21, and the slider 22 is vertically slidably connected to the two vertical walls of the gantry 21. A threaded through hole is vertically opened on the horizontal wall of each gantry 21. Two threaded rods 23 are provided and are arranged one-to-one with the gantry 21, and the threaded rods 23 are threadedly connected to the corresponding threaded through holes on the gantry 21. A nut is fixed to the top of the threaded rod 23, and the bottom of the threaded rod 23 is clamped and rotatably engaged with the top of the slider 22. Specifically, the threaded rod 23 and the nut at the top thereof can be welded together. When the nut is turned forward or reversely, the threaded rod 23 rotates synchronously, and the threaded rod 23 rises or falls. The threaded rod 23 drives the slider 22 to rise or fall, and the upper mold shaft 18 rises or falls, and the upper pressure wheel rises or falls synchronously, thereby achieving the purpose of adjusting the distance between the upper pressure wheel and the lower pressure wheel, and then the indentation depth can be adjusted.

[0048] A circular groove is provided at the top of the slider 22, and the diameter of the circular groove is larger than the diameter of the threaded rod 23. A circular disc matching the circular groove is integrally formed at the bottom of the threaded rod 23, and the circular disc is rotatably connected to the circular groove. A flange plate 24 is fixedly connected to the top of the slider 22, and the threaded rod 23 rotatably penetrates the flange plate 24.

[0049] The working principle of a carton creasing device of the utility model is as follows: the first reduction motor 6 drives the rotating shaft 3 connected thereto to rotate, the rotating shaft 3 drives the conveyor belt 1 to run, when the conveyor belt 1 passes under the paper stack 5, the cardboard 4 at the bottom end of the paper stack 5 enters the transport trough 101, and then the cardboard 4 continues to move to the two rollers 15 with the conveyor belt 1, the third reduction motor 16 drives the rollers 15 connected thereto to rotate, and the two rollers 15 rotate synchronously under the meshing action of the two gears 17, and the cardboard 4 is transported from between the two rollers 15 to the creasing mechanism, the fourth reduction motor 20 drives the lower die shaft 19 to rotate, and the lower pressing wheel rotates synchronously and cooperates with the upper pressing wheel to creasing the cardboard 4. The paper stack 5 is limited by the baffle 9 and the two limiting rods 10, so that the paper stack 5 will not move or shake at will, thereby ensuring that the cardboard 4 at the bottom end of the paper stack 5 can correctly enter the transport trough 101, and the transport trough 101 limits the cardboard 4, and the guiding and conveying action of the two rollers 15 makes the cardboard 4 not move at will during the conveying process. In summary, it is ensured that the paperboard 4 will not deviate during the conveying process, and the phenomenon of crooked indentation or the actual indentation position being different from the required indentation position is effectively avoided, thereby improving the indentation accuracy.

[0050] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other, and the embodiments can be combined with each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0051] The above embodiments are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A carton creasing device, comprising a creasing mechanism, characterized in that: Also includes: A conveying assembly, the conveying assembly comprising a conveyor belt (1), the outer surface of the conveyor belt (1) being provided with a conveying groove (101) matching the outer contour of a paperboard (4), and the depth of the conveying groove (101) matching the thickness of the paperboard (4), and the conveying groove (101) being provided with a plurality of spaced-apart grooves; A guide conveying roller assembly is arranged at the discharge end of the conveyor belt (1) and is capable of guiding and conveying the paperboard (4); the indentation mechanism is arranged at the discharge end of the guide conveying roller assembly; A limit assembly is arranged above the feed end of the conveyor belt (1), the bottom end of the limit assembly is in sliding contact with the surface of the conveyor belt (1), the paper stack (5) is located on the conveyor belt (1), and the limit assembly is in contact with both sides of the paper stack (5) and a side close to the discharge end of the conveyor belt (1).

2. The carton creasing device according to claim 1, characterized in that: The conveying assembly also includes a U-shaped frame (2), a rotating shaft (3), a first reduction motor (6) and a support assembly. The rotating shaft (3) is rotatably mounted in the U-shaped frame (2). Two rotating shafts (3) are provided and are spaced apart. The conveyor belt (1) is sleeved on the two rotating shafts (3). The first reduction motor (6) is fixedly connected to the outer wall of the U-shaped frame (2). The output shaft of the first reduction motor (6) is coaxially fixedly connected to one end of any one of the rotating shafts (3). The support assembly is located below the limiting assembly. The support assembly is mounted in the U-shaped frame (2) and is located in the inner cavity of the conveyor belt (1). The upper surface of the support assembly is in contact with the conveyor belt (1).

3. The carton creasing device according to claim 2, characterized in that: The support assembly comprises a support rod (7), both ends of which are rotatably connected to the side walls of the U-shaped frame (2), the circumferential surface of the support rod (7) is in sliding contact with the conveyor belt (1), and a plurality of the support rods (7) are arranged in parallel at intervals.

4. The carton creasing device according to claim 2, characterized in that: The limiting component comprises a baffle (9) and a sorting component. A top plate (8) is arranged above the U-shaped frame (2). The baffle (9) and the sorting component are both fixed on the lower surface of the top plate (8). The baffle (9) contacts the side of the paper stack (5) close to the discharge end of the conveyor belt (1). The projections of the sorting component and the conveyor belt (1) on a horizontal plane are perpendicular to each other, and the sorting component contacts both sides of the paper stack (5). The bottom ends of the baffle (9) and the sorting component are both in sliding contact with the surface of the conveyor belt (1).

5. The carton creasing device according to claim 4, characterized in that: The sorting component comprises two limit rods (10) and a guide rod (11); two support plates are fixed symmetrically on the lower surface of the top plate (8); the guide rod (11) is fixedly mounted between the two support plates, and the projections of the guide rod (11) and the conveyor belt (1) on the horizontal plane are perpendicular to each other; the guide rod (11) slides through the two limit rods (10); the two limit rods (10) are respectively located on both sides of the paper stack (5) and the opposite surfaces of the two limit rods (10) are respectively in contact with the corresponding side surfaces of the paper stack (5); the bottom end of the limit rod (10) is in sliding contact with the surface of the conveyor belt (1); a driving component is installed on the two support plates, and the driving component can drive the two limit rods (10) to move away from or towards each other.

6. The carton creasing device according to claim 5, characterized in that: The driving assembly comprises a bidirectional screw (12) and a second reduction motor (13), wherein both ends of the bidirectional screw (12) are provided with threads with opposite rotation directions, and the bidirectional screw (12) is rotatably mounted between the two support plates, and the threaded section at one end of the bidirectional screw (12) penetrates the corresponding limiting rod (10) and is threadedly connected, and the threaded section at the other end of the bidirectional screw (12) penetrates the other limiting rod (10) and is threadedly connected, and the second reduction motor (13) is fixedly connected to any of the support plates, and the output shaft of the second reduction motor (13) is coaxially fixedly connected to one end of the bidirectional screw (12).

7. The carton creasing device according to claim 2, characterized in that: The guide conveying roller assembly comprises a mounting plate (14) and a roller shaft (15). Two mounting plates (14) are symmetrically arranged at intervals and are respectively fixedly connected to the side walls of the U-shaped frame (2). The roller shaft (15) is rotatably mounted between the two mounting plates (14). Two roller shafts (15) are arranged at intervals above and below. The gap between the two roller shafts (15) is arranged corresponding to the discharge end of the conveyor belt (1), and the distance between the opposite surfaces of the two roller shafts (15) is equal to the thickness of the paperboard (4). A third reduction motor (16) is installed on any of the mounting plates (14). The output shaft of the third reduction motor (16) is coaxially fixedly connected to one end of any of the roller shafts (15). The ends of the two roller shafts (15) away from the third reduction motor (16) both penetrate the mounting plate (14) and the ends are both fixedly connected to gears (17), and the two gears (17) are meshed.

8. The carton creasing device according to claim 7, characterized in that: The indentation mechanism comprises an upper die shaft (18) and a lower die shaft (19), the lower die shaft (19) is rotatably mounted between the two mounting plates (14), each mounting plate (14) is provided with a lifting assembly, the upper die shaft (18) is rotatably mounted between the two lifting assemblies, the upper die shaft (18) is located above the lower die shaft (19), an upper pressing wheel is coaxially fixedly connected to the upper die shaft (18), and a lower pressing wheel is coaxially fixedly connected to the lower die shaft (19), the upper pressing wheel and the lower pressing wheel are concavely matched and the matching part is arranged corresponding to the gap between the two roller shafts (15); a fourth reduction motor (20) is fixedly mounted on any of the mounting plates (14), and the output shaft of the fourth reduction motor (20) is coaxially fixedly connected to one end of the lower die shaft (19).

9. The carton creasing device according to claim 8, characterized in that: The lifting assembly comprises a gantry (21), a slider (22) and a threaded rod (23); the gantry (21) is provided with two and is arranged one-to-one with the mounting plate (14); the gantry (21) is fixedly connected to the corresponding mounting plate (14); the slider (22) is provided with two and is arranged one-to-one with the gantry (21); the slider (22) is located in the corresponding gantry (21); and the slider (22) is vertically slidably connected to two vertical walls of the gantry (21); a threaded through hole is vertically opened on each horizontal wall of the gantry (21); the threaded rod (23) is provided with two and is arranged one-to-one with the gantry (21); and the threaded rod (23) is threadedly connected to the corresponding threaded through hole on the gantry (21); a nut is fixed on the top of the threaded rod (23); and the bottom end of the threaded rod (23) is clamped and rotatably matched with the top of the slider (22).

10. The carton creasing device according to claim 9, characterized in that: A circular groove is formed at the top of the slider (22), the diameter of the circular groove is larger than the diameter of the threaded rod (23), a circular disc matching the circular groove is integrally formed at the bottom of the threaded rod (23), the circular disc is rotatably connected to the circular groove, a flange plate (24) is fixedly connected to the top of the slider (22), and the threaded rod (23) rotatably penetrates the flange plate (24).

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