Milk box packaging ink-jet device

Abstract

The utility model relates to milk production and processing technology field, especially a kind of milk box packaging code spraying device, including rack, main conveying belt and laser code spraying mechanism being set on rack, guiding positioning mechanism is equipped at the working station of laser code spraying mechanism on rack, guiding positioning mechanism includes a pair of oppositely arranged guiding conveying belt assembly, the pair of guiding conveying belt assembly is respectively arranged in the width direction of main conveying belt two sides, the conveying direction of guiding conveying belt is consistent with the conveying direction of main conveying belt, and the conveying plane of guiding conveying belt assembly is perpendicular to the conveying plane of main conveying belt, to form a positioning channel suitable for guiding conveying from two sides and restraining milk box, the output end of laser code spraying mechanism is towards positioning channel.

Description

Technical Field

[0001] This utility model relates to the field of milk production and processing technology, and in particular to a milk carton packaging coding device. Background Technology

[0002] In the dairy and liquid food packaging industry, paper-based composite packaging materials such as Tetra Pak and gable-top cartons are widely used due to their excellent protective performance and convenience. On the production lines of these products, the inkjet marking process is a crucial step, used to mark product traceability information such as production date, shelf life, and batch number on the surface of the packaging. Currently, the mainstream inkjet marking method involves placing the packaged milk cartons on a continuously running conveyor belt, allowing them to pass sequentially through the processing area of ​​a laser marking device. When a photoelectric sensor detects that the milk carton has reached the preset processing position, it triggers the laser to emit a laser beam. The system controls the laser to scan the surface of the packaging carton, forming the required characters and patterns.

[0003] However, this existing conveyor belt-based laser marking method has a particularly prominent technical flaw. Due to the long-term high-speed operation of the production line, the transmission mechanism of the conveyor belt inevitably experiences wear, loosening, or uneven tension; at the same time, multiple packaging boxes may squeeze or jam against each other on the conveyor belt. These factors can easily cause varying degrees of vibration or momentary deviation of the conveyor belt during operation, resulting in a deviation between the actual position of the milk carton in the marking area and the preset position. When the laser marking equipment performs marking according to the preset parameters, this positional deviation will directly cause the marked characters or patterns to shift, deform, or even become incomplete, seriously affecting the clarity and accuracy of product marking. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model proposes a milk carton packaging coding device to prevent milk cartons from shaking or shifting.

[0005] This utility model is achieved through the following technical solution: A laser marking device for milk packaging cartons includes a frame, a main conveyor belt mounted on the frame, and a laser marking mechanism. A guiding and positioning mechanism is provided on the frame at the working position of the laser marking mechanism. The guiding and positioning mechanism includes a pair of oppositely arranged guiding conveyor belt assemblies, which are respectively positioned on both sides of the main conveyor belt in the width direction. The conveying direction of the guiding conveyor belts is consistent with the conveying direction of the main conveyor belt, and the conveying plane of the guiding conveyor belt assemblies is perpendicular to the conveying plane of the main conveyor belt, thereby forming a positioning channel suitable for guiding and constraining the milk cartons from both sides. The output end of the laser marking mechanism faces the positioning channel.

[0006] As a further improvement of this utility model, each side of the guide conveyor belt assembly further includes a drive motor, two spaced-apart mounting plates, and a guide conveyor belt disposed between the two mounting plates; the drive motor is disposed above the mounting plates, and its output end extends downward into the space between the two mounting plates and is connected to the guide conveyor belt for transmission.

[0007] As a further improvement of this utility model, the guiding and positioning mechanism also includes a spacing adjustment mechanism for driving the guide conveyor belt assemblies on both sides to move towards or away from each other; the spacing adjustment mechanism includes two mounting rods horizontally arranged on both sides of the frame, a movable seat, a first screw and a first handwheel; The two mounting rods extend along the width of the main conveyor belt, and a fixing seat is provided between their ends; The movable seat is slidably fitted onto the mounting rod; The first screw is threadedly connected to the movable seat, with one end rotatably connected to the side wall of the frame and the other end passing through the fixed seat and connected to the first handwheel.

[0008] As a further improvement of this utility model, the guiding and positioning mechanism also includes a lifting adjustment mechanism for driving the guide conveyor belt assembly to rise and fall; The lifting and adjusting mechanism includes at least two connecting rods, a lifting seat, a second screw, and a second handwheel; The connecting rod is vertically arranged, with its upper end fixedly connected to the lower end face of the mounting plate, and its lower end passing downward through the movable seat; The lifting seat is fixedly connected between the lower ends of the connecting rods of the guide conveyor belt assembly on the same side; The second screw is vertically arranged, with its lower end connected to the second handwheel, and its upper end passing through the lifting seat and the movable seat in sequence, and finally rotatably connected to the lower end face of the mounting plate; The second screw is threadedly connected to the movable seat.

[0009] As a further improvement of this utility model, the laser marking mechanism includes a base, a vertical rod, a clamping seat, a horizontal rod, a laser mounting seat, and a laser marking tube; The base is disposed on one side of the frame, and the vertical rod is fixed to the base; The clamping seat is configured to be fitted onto the vertical rod and can be raised, lowered, and locked along the vertical rod for positioning; The transverse bar is disposed on the clamping seat and can move horizontally and lock in position relative to the clamping seat; The laser mounting base is fitted onto the transverse rod and can slide and lock along the transverse rod for positioning; The laser marking tube is mounted on the laser mounting base.

[0010] As a further improvement of this utility model, both the clamping seat and the laser mounting seat are provided with mounting holes, and one side of the mounting hole is provided with an outwardly extending notch, thereby dividing the mounting hole into two opposing clamping parts 24. The clamping part 24 is provided with a locking screw, which is configured to pass through one of the clamping parts 24 and be threadedly connected to the other clamping part 24.

[0011] As a further improvement of this utility model, the laser mounting base includes a connecting part for connecting with the transverse rod, and a rotating part that can rotate relative to the connecting part, and the laser coding tube is disposed on the rotating part.

[0012] As a further improvement of this utility model, a connecting cylinder is provided on one side of the connecting part, and a connecting groove is provided on the rotating part. The connecting groove is used for the connecting cylinder to pass through and rotate relative to each other. A rotation positioning device is provided between the connecting part and the rotating part.

[0013] As a further improvement of this utility model, multiple arc-shaped positioning grooves are evenly distributed on the periphery of the connecting cylinder; the rotating part is provided with a positioning hole, and an elastic element and a positioning pin are provided in the positioning hole, and the positioning pin is adapted to any one of the arc-shaped positioning grooves under the action of the elastic element.

[0014] As a further improvement of this utility model, a limiting annular groove is provided on the connecting cylinder, and a limiting member is provided on the rotating part that passes through the connecting groove and the limiting groove.

[0015] The beneficial effects of this utility model are as follows: This utility model sets up a positioning channel composed of guide conveyor belt assemblies on both sides at the working position of the laser marking mechanism. The conveying direction of this channel is consistent with that of the main conveyor belt, but perpendicular to the conveying plane of the main conveyor belt. When the milk carton enters this channel, its sides are restrained by the guide conveyor belts, thus limiting its position in the horizontal direction. This effectively counteracts the vibration of the main conveyor belt and prevents the milk carton from shifting laterally during the marking process, ensuring that the laser marking mechanism can always be aligned with the preset marking area of ​​the milk carton. At the same time, the conveying power of the guide conveyor belt assembly itself can assist the milk carton to pass smoothly through the marking station, avoiding slippage or stagnation that may occur due to the main conveyor belt driving alone, further improving the positional stability of the milk carton during marking. Attached Figure Description

[0016] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of this utility model, wherein: Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 Corresponding to the embodiments of this utility model Figure 1 Enlarged view of a section at point A in the middle; Figure 3 Corresponding to the embodiments of this utility model Figure 1 Enlarged view of a section at point B in the middle; Figure 4 This is a schematic diagram of the internal structure of the laser mounting base in an embodiment of this utility model.

[0017] The diagram shows the following components: 1. Frame; 2. Main conveyor belt; 3. Positioning channel; 4. Milk carton; 5. Drive motor; 6. Mounting plate; 7. Guide conveyor belt; 8. Mounting rod; 9. Movable seat; 10. First screw; 11. First handwheel; 12. Fixed seat; 13. Connecting rod; 14. Lifting seat; 15. Second screw; 16. Second handwheel; 17. Base; 18. Vertical rod; 19. Clamping seat; 20. Horizontal rod; 21. Laser mounting seat; 22. Laser coding tube; 23. Locking screw; 24. Clamping part; 211. Connecting part; 212. Rotating part; 213. Connecting cylinder; 214. Connecting groove; 215. Arc-shaped positioning groove; 216. Positioning hole; 217. Elastic element; 218. Positioning pin; 219. Limiting ring groove; 220. Limiting element. Detailed Implementation

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

[0019] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0020] refer to Figures 1 to 4 The present utility model embodiment discloses the following: A milk carton coding device includes a frame 1, a main conveyor belt 2 mounted on the frame 1, and a laser coding mechanism. A guide positioning mechanism is provided on the frame 1 at the working position of the laser coding mechanism. The guide positioning mechanism includes a pair of oppositely arranged guide conveyor belt assemblies, which are respectively located on both sides of the main conveyor belt 2 in the width direction. The conveying direction of the guide conveyor belt 7 is consistent with the conveying direction of the main conveyor belt 2, and the conveying plane of the guide conveyor belt assembly is perpendicular to the conveying plane of the main conveyor belt 2, thereby forming a positioning channel 3 suitable for guiding and constraining the milk carton 4 from both sides. The output end of the laser coding mechanism faces the positioning channel 3. The workstation is equipped with a "positioning channel 3" consisting of guide conveyor belt assemblies on both sides. The conveying direction of this channel is consistent with that of the main conveyor belt 2, but perpendicular to the conveying plane of the main conveyor belt 2. When the milk carton 4 enters this channel, its sides are restrained by the guide conveyor belts 7, thus limiting its position in the horizontal direction. This effectively counteracts the vibration of the main conveyor belt 2, thereby preventing the milk carton 4 from shifting laterally during the coding process and ensuring that the laser coding mechanism can always be aligned with the preset coding area of ​​the milk carton 4. At the same time, the conveying power of the guide conveyor belt assembly itself can assist the milk carton 4 to pass smoothly through the coding station, avoiding slippage or stagnation that may occur due to the main conveyor belt 2 driving alone, further improving the positional stability of the milk carton 4 during coding.

[0021] Each side of the guide conveyor belt assembly also includes a drive motor 5, two spaced-apart mounting plates 6, and a guide conveyor belt 7 disposed between the two mounting plates 6; the drive motor 5 is disposed above the mounting plates 6, and its output end extends downward into the space between the two mounting plates 6 and is connected to the guide conveyor belt 7 for transmission; the guide conveyor belt 7 is driven to rotate by rotating the motor, which has a simple structure, and the drive motor 5 is placed above, saving lateral space and making the transmission connection simpler and more convenient.

[0022] In actual production, milk cartons 4 may have different sizes (widths). Therefore, in this embodiment, the guiding and positioning mechanism also includes a spacing adjustment mechanism for driving the guide conveyor belt assemblies on both sides to move towards or away from each other. The spacing adjustment mechanism includes two mounting rods 8, a movable seat 9, a first screw 10, and a first handwheel 11, which are horizontally arranged on both sides of the frame 1. The two mounting rods 8 extend along the width direction of the main conveyor belt 2, and a fixed seat 12 is provided between their ends. The movable seat 9 is slidably sleeved on the mounting rods 8. The first screw 10 is threadedly connected to the movable seat 9, and one end is rotatably connected to the side wall of the frame 1, while the other end passes through the fixed seat 12 and is connected to the first handwheel 11. When it is necessary to adjust the spacing between the two guide conveyor belt assemblies to accommodate milk cartons 4 of different sizes, the operator can rotate the first handwheel 11 to drive the first screw 10 to rotate. Since the first screw 10 is threadedly connected to the movable seat 9, and the movable seat 9 is sleeved on the mounting rod 8 and cannot rotate, the rotation of the first screw 10 will be converted into the linear movement of the movable seat 9 along the length direction of the mounting rod 8, thereby driving the guide conveyor belt assembly connected to the movable seat 9 to move synchronously, realizing the flexible adjustment of the spacing between the two guide conveyor belt assemblies. The adjustment method has a simple and reliable structure, is easy to operate, and can quickly respond to the production needs of milk cartons 4 of different specifications, thereby improving the versatility and applicability of the equipment.

[0023] Furthermore, different batches of milk cartons 4 may have different heights, or the height of the guide conveyor belt 7 needs to be adjustable to meet the requirements of different coding positions on the same milk carton 4. Therefore, the guide positioning mechanism also includes a lifting adjustment mechanism for driving the guide conveyor belt assembly to rise and fall. The lifting adjustment mechanism includes at least two connecting rods 13, a lifting seat 14, a second screw 15, and a second handwheel 16. The connecting rods 13 are vertically arranged, with their upper ends fixedly connected to the lower end face of the mounting plate 6, and their lower ends passing downwards through the movable seat 9. The lifting seat 14 is fixedly connected between the lower ends of the connecting rods 13 on the same side of the guide conveyor belt assembly. The second screw 15 is vertically arranged, with its lower end connected to the second handwheel 16, and its upper end passing sequentially through the lifting seat 14 and the movable seat 9, ultimately connecting with the lower end of the mounting plate 6. The end face is rotated; the second screw 15 is threadedly connected to the movable seat 9; when the operator rotates the second handwheel 16, the second screw 15 rotates synchronously. Since the second screw 15 is threadedly connected to the movable seat 9, and the position of the movable seat 9 is fixed by the spacing adjustment mechanism, the rotation of the second screw 15 is converted into its own vertical movement, which in turn drives the lifting seat 14 and the connecting rod 13 connected to it to move up and down. The connecting rod 13 pulls the mounting plate 6, which drives the guide conveyor belt assembly to rise and fall synchronously, thereby realizing the adjustment of the height of the guide conveyor belt 7. This allows the equipment to meet the conveying and guiding needs of milk cartons 4 at different heights or different coding positions, thereby improving the adaptability and operational flexibility of the equipment in actual production, ensuring that the milk cartons 4 are always in a stable conveying posture during the coding process, and ensuring the coding quality.

[0024] The laser marking mechanism includes a base 17, a vertical rod 18, a clamping seat 19, a horizontal rod 20, a laser mounting base 21, and a laser marking tube 22. The base 17 is disposed on one side of the frame 1, and the vertical rod 18 is fixed to the base 17. The clamping seat 19 is configured to be fitted onto the vertical rod 18 and can be raised, lowered, and locked along the vertical rod 18. The horizontal rod 20 is disposed on the clamping seat 19 and can move horizontally relative to the clamping seat 19 and be locked. The laser mounting base 21 is fitted onto the horizontal rod 20 and can slide and be locked along the horizontal rod 20. The laser marking tube 22... 2. Installed on the laser mounting base 21; by adjusting the height position of the clamping seat 19 on the vertical rod 18, the vertical height of the laser marking tube 22 can be adjusted; the horizontal movement of the horizontal rod 20 relative to the clamping seat 19 can change the lateral extension distance of the laser marking tube 22; and the sliding of the laser mounting base 21 along the horizontal rod 20 further adjusts the marking position; the operator can flexibly control the position locking of each component according to the actual marking requirements of the milk carton 4, so that the laser marking tube 22 is accurately aligned with the area to be marked, ensuring clear marking and accurate position, thereby effectively adapting to the marking operation requirements of milk carton 4 of different specifications.

[0025] Specifically, both the clamping seat 19 and the laser mounting seat 21 are provided with mounting holes. One side of each mounting hole has an outwardly extending notch, thus dividing the mounting hole into two opposing clamping portions 24. Each clamping portion 24 is provided with a locking screw 23, which is configured to pass through one of the clamping portions 24 and be threadedly connected to the other clamping portion 24 (the clamping seat 19 and the laser mounting seat 21 are made of a deformable material such as plastic, allowing for elastic expansion or contraction). When it is necessary to adjust the position of the clamping seat 19 or the laser mounting seat 21, the operator can loosen the locking screw 23. This increases the distance between the two clamping parts 24, thereby enlarging the diameter of the mounting hole and releasing the clamping fixation on the vertical rod 18 or the horizontal rod 20, allowing the component to slide and adjust along the corresponding rod. After the position is adjusted, the locking screw 23 is tightened in the opposite direction. The thread transmission of the locking screw 23 drives the two clamping parts 24 to move closer to each other, and the friction between the inner wall of the clamping part 24 and the surface of the rod achieves reliable locking. This ensures that during the coding operation, the clamping seat 19 and the laser mounting seat 21 will not shift due to vibration or other factors, thus ensuring that the laser coding tube 22 is always in a precise working position.

[0026] The laser mounting base 21 includes a connecting part 211 for connecting to the horizontal rod 20, and a rotating part 212 that can rotate relative to the connecting part 211. The laser marking tube 22 is disposed on the rotating part 212. By providing the rotating part 212 that can rotate relative to the connecting part 211, the operator can flexibly adjust the spray direction of the laser marking tube 22 according to the marking angle requirements on the surface of the milk carton 4. For example, when the surface of the milk carton 4 is a slope or requires a specific tilt angle for marking, simply rotating the rotating part 212 can keep the light emission direction of the laser marking tube 22 perpendicular to or at a preset angle to the target marking surface, avoiding character deformation or blurring caused by marking angle deviation, and further improving the marking quality.

[0027] Specifically, a connecting cylinder 213 is provided on one side of the connecting part 211, and a connecting groove 214 is provided on the rotating part 212. The connecting groove 214 is used for the connecting cylinder 213 to pass through and rotate relative to it. A rotation positioning device is provided between the connecting part 211 and the rotating part 212. Multiple arc-shaped positioning grooves 215 are evenly distributed on the periphery of the connecting cylinder 213. The rotating part 212 is provided with a positioning hole 216. An elastic element 217 (compression spring) and a positioning pin 218 are provided in the positioning hole 216. The positioning pin 218 is adapted to any one of the arc-shaped positioning grooves 215 under the action of the elastic element 217. In addition, the end of the positioning pin 218 is an arc-shaped end. When the rotating part 212 rotates relative to the connecting part 211, the arc-shaped end of the positioning pin 218 slides along the circumferential surface of the connecting cylinder 213. When it rotates to a preset angle, the positioning pin 218 is embedded in the corresponding arc-shaped positioning groove 215 under the elastic force of the elastic element 217, realizing the rapid positioning of the rotating part 212 and the connecting part 211. If it is necessary to adjust to other angles, it is only necessary to apply external force to overcome the elastic force of the elastic element 217 to make the positioning pin 218 disengage from the current arc-shaped positioning groove 215, and continue to rotate the rotating part 212. This structure, through the combination of mechanical positioning and elastic reset, not only ensures the convenience of angle adjustment, but also ensures the positional stability of the rotating part 212 during the inkjet printing process, avoiding angle deviation caused by vibration.

[0028] The connecting cylinder 213 is provided with a limiting annular groove 219, and the rotating part 212 is provided with a limiting member 220 that passes through the connecting groove 214 and the limiting annular groove 219. The limiting member 220 can slide along the trajectory of the limiting annular groove 219. Its cooperation with the limiting annular groove 219 can effectively limit the relative displacement of the connecting cylinder 213 and the connecting groove 214 in the axial direction, prevent the rotating part 212 from axially moving during rotation, and avoid the connection structure from loosening due to long-term use or uneven force.

[0029] It is worth mentioning that the main conveyor belt 2 in this embodiment is existing equipment and is well known to those skilled in the art. Its specific structure and operating principle will not be described here. Similarly, the laser marking tube 22 is also existing equipment and is well known to those skilled in the art. Its specific structure and operating principle will not be described here.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A milk carton packaging coding device, comprising a frame (1), a main conveyor belt (2) mounted on the frame (1), and a laser coding mechanism, characterized in that: The frame (1) is provided with a guide positioning mechanism at the working position of the laser marking mechanism. The guide positioning mechanism includes a pair of guide conveyor belt assemblies arranged opposite each other. The pair of guide conveyor belt assemblies are respectively arranged on both sides of the width direction of the main conveyor belt (2). The conveying direction of the guide conveyor belt (7) is consistent with the conveying direction of the main conveyor belt (2), and the conveying plane of the guide conveyor belt assembly is perpendicular to the conveying plane of the main conveyor belt (2), thereby forming a positioning channel (3) suitable for guiding and constraining the milk carton (4) from both sides. The output end of the laser marking mechanism faces the positioning channel (3).

2. The milk carton packaging inkjet printing device according to claim 1, characterized in that: Each side of the guide conveyor belt assembly also includes a drive motor (5), two spaced mounting plates (6), and a guide conveyor belt (7) disposed between the two mounting plates (6); the drive motor (5) is disposed above the mounting plate (6), and its output end extends downward between the two mounting plates (6) and is connected to the guide conveyor belt (7) for transmission.

3. The milk carton packaging inkjet printing device according to claim 2, characterized in that: The guiding and positioning mechanism also includes a spacing adjustment mechanism for driving the guide conveyor belt assemblies on both sides to move towards or away from each other; the spacing adjustment mechanism includes two mounting rods (8), a movable seat (9), a first screw (10), and a first handwheel (11) horizontally arranged on both sides of the frame (1); The two mounting rods (8) extend along the width direction of the main conveyor belt (2), and a fixing seat (12) is provided between their ends; The movable seat (9) is slidably fitted onto the mounting rod (8); The first screw (10) is threadedly connected to the movable seat (9), and one end is rotatably connected to the side wall of the frame (1), while the other end passes through the fixed seat (12) and is connected to the first handwheel (11).

4. The milk carton packaging inkjet printing device according to claim 3, characterized in that: The guiding and positioning mechanism also includes a lifting adjustment mechanism for driving the guide conveyor belt assembly to rise and fall; The lifting adjustment mechanism includes at least two connecting rods (13), a lifting seat (14), a second screw (15), and a second handwheel (16); The connecting rod (13) is vertically arranged, with its upper end fixedly connected to the lower end face of the mounting plate (6), and its lower end passing downward through the movable seat (9); The lifting seat (14) is fixedly connected to the lower ends of the connecting rods (13) of the guide conveyor belt assembly on the same side; The second screw (15) is vertically arranged, its lower end is connected to the second handwheel (16), its upper end passes through the lifting seat (14) and the movable seat (9) in sequence, and finally rotatably connects to the lower end face of the mounting plate (6); The second screw (15) is threadedly connected to the movable seat (9).

5. The milk carton packaging inkjet printing device according to claim 1, characterized in that: The laser marking mechanism includes a base (17), a vertical rod (18), a clamping seat (19), a horizontal rod (20), a laser mounting seat (21), and a laser marking tube (22); The base (17) is disposed on one side of the frame (1), and the vertical rod (18) is fixed on the base (17); The clamping seat (19) is configured to be fitted onto the vertical rod (18) and can be raised, lowered and locked along the vertical rod (18); The transverse bar (20) is disposed on the clamping seat (19) and can move horizontally and lock in position relative to the clamping seat (19); The laser mounting base (21) is fitted onto the transverse rod (20) and can slide and lock along the transverse rod (20); The laser marking tube (22) is mounted on the laser mounting base (21).

6. The milk carton packaging coding device according to claim 5, characterized in that: Both the clamping seat (19) and the laser mounting seat (21) are provided with mounting holes, and one side of the mounting hole is provided with an outwardly extending notch, thereby dividing the mounting hole into two opposing clamping parts; The clamping part is provided with a locking screw (23), which is configured to pass through one of the clamping parts and be threadedly connected to the other clamping part.

7. A milk carton packaging coding device according to claim 6, characterized in that: The laser mounting base (21) includes a connecting part (211) for connecting to the transverse rod (20) and a rotating part (212) that can rotate relative to the connecting part (211), and the laser marking tube (22) is disposed on the rotating part (212).

8. A milk carton packaging coding device according to claim 7, characterized in that: A connecting cylinder (213) is provided on one side of the connecting part (211), and a connecting groove (214) is provided on the rotating part (212). The connecting groove (214) is used for the connecting cylinder (213) to pass through and rotate relative to each other. A rotation positioning device is provided between the connecting part (211) and the rotating part (212).

9. A milk carton packaging coding device according to claim 8, characterized in that: The connecting cylinder (213) has a plurality of arc-shaped positioning grooves (215) evenly distributed on its periphery; the rotating part (212) is provided with a positioning hole (216), and an elastic element (217) and a positioning pin (218) are provided in the positioning hole (216). The positioning pin (218) is adapted to any one of the arc-shaped positioning grooves (215) under the action of the elastic element (217).

10. A milk carton packaging coding device according to claim 8, characterized in that: The connecting cylinder (213) is provided with a limiting annular groove (219), and the rotating part (212) is provided with a limiting member (220) that passes through the connecting groove (214) and the limiting annular groove (219).

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