Multi-group synchronous inkjet printer based on single-dose eye drop packaging and method of use

Abstract

The present application relates to single dose eye drop packaging technical field, especially for based on single dose eye drop packaging's multiple group synchronization ink-jet printer and use method, including fixed base, ultraviolet laser head and driving motor, the middle fixed connection has driving motor in fixed base, the upper end one side of fixed base is fixedly connected with the top column, the driving motor main shaft top is fixedly connected with the material assembly, the material assembly upper end is installed with the four groups of material bearing assembly that is annular equidistance distribution, the eye drop packaging box is placed in material bearing assembly upper end, the side of fixed base is fixedly connected with elastic base, the one end of elastic base is connected with the movable bending plate through spring, the other end of bending plate is connected with the arrangement mechanism through the connecting frame. In the present application, the output per unit time is greatly improved, the slope of trapezoidal block is used to drive the bending plate to move down when the material rotating disc rotates, the two-stage elastic positioning plate is used to drive the flexible clamping and calibration of the two ends of the hose, and the consistency of multiple hoses can be arranged without additional power.

Description

Technical Field

[0001] This invention relates to a multi-group synchronous inkjet printer for single-dose eye drop packaging and its usage method, belonging to the field of single-dose eye drop packaging technology. Background Technology

[0002] Single-dose eye drops are typically packaged in thin, long tubes made of low-density polyethylene or polypropylene. They are preservative-free and require independent traceability. During production, the production batch number, expiration date, and traceability code must be printed on the surface of the tube.

[0003] Existing coding equipment mostly uses a conveyor belt with a single laser head for sequential coding, or multiple laser heads side-by-side for synchronous coding. The multi-group synchronous coding method often relies on a V-groove on the conveyor belt to position a flexible tube, and an external cylinder or motor-driven flattening mechanism flattens the tube surface before the laser head prints the code. For example, in a common solution, the tube falls into the V-groove by gravity and is directly conveyed to the area below the laser head, where an independent pressure plate device presses down on the upper surface of the tube while the laser head prints the code.

[0004] However, in existing technologies, the tubing is positioned solely by gravity within the V-groove. During transport, it is prone to rolling and axial displacement due to vibration or inertia. Furthermore, the flattening action is driven by an independent power source, making it difficult to precisely coordinate with the tubing's transport and lifting actions. This results in inconsistent flattening positions and uneven surfaces when multiple tubings are simultaneously printed, leading to UV laser focusing deviations, causing blurred or missing characters in the printed code, and affecting the reliability of product traceability. Therefore, there is an urgent need to improve the multi-group synchronous inkjet printer and its usage method based on single-dose eye drop packaging to solve the aforementioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-group synchronous inkjet printer and its usage method based on single-dose eye drop packaging, in order to solve the problems in the prior art where the tubing is positioned solely by gravity in the V-groove, and is prone to rolling and axial displacement due to vibration or inertia during transportation. Furthermore, the flattening action is driven by an independent power source, making it difficult to precisely coordinate with the transportation and lifting actions of the tubing. This results in inconsistent flattening positions and uneven surfaces of the tubing when multiple tubings are printed simultaneously, which in turn causes ultraviolet laser focusing deviation, leading to blurred or missing characters in the printed code and affecting the reliability of product traceability.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A multi-unit synchronous inkjet printer for single-dose eye drop packaging and its usage method are described, including a fixed base, an ultraviolet laser head, and a drive motor. The drive motor is fixedly connected to the middle of the fixed base, and a lifting column is fixedly connected to one side of the upper end of the fixed base. A material transfer assembly is fixedly connected to the top of the drive motor's main shaft. Four sets of equally spaced, annularly distributed material-bearing components are installed on the upper end of the material transfer assembly. An eye drop packaging box is placed on the upper end of each material-bearing component. An elastic base is fixedly connected to one side of the fixed base, and one end of the elastic base is connected to a vertically movable curved plate via a spring. The other end of the curved plate is connected to a sorting mechanism via a connecting frame. Multiple ultraviolet laser heads for printing codes on eye drop packaging boxes are installed above the fixed base. Flattening frames with hollowed-out centers are installed on the outer sides of the multiple ultraviolet laser heads. The material receiving assembly includes a material receiving tray. Multiple V-shaped grooves are opened on the inner side of the upper end of the material receiving tray. A first air hole is opened at the bottom end of the V-shaped groove. A V-shaped plate is installed on the inner side of the upper end of the V-shaped groove. Anti-slip grooves are opened on both sides of the upper end of the V-shaped plate. A second air hole is opened at the bottom end of the V-shaped plate. A movable column is fixedly connected to the middle of the bottom end of the material receiving tray.

[0008] Furthermore, the V-shaped plate has an arc-shaped bend in the middle, and the arc-shaped bend in the middle of the V-shaped plate is adapted to the eye drop packaging box. An arc-shaped sealing gasket is installed on the upper edge of the second air hole.

[0009] Furthermore, the material transfer assembly includes a material transfer disk with a vertically projected circular shape. Four material slots are provided on the inner side of the upper end of the material transfer disk. A first spring is fixedly connected to the four corners of the bottom of each material slot. A circular hole penetrating the material transfer disk is provided in the middle of the bottom of the material slot.

[0010] Furthermore, both the bottom end of the moving column and the top end of the lifting column are arc-shaped. The lifting column is positioned below the ultraviolet laser head, and the moving column is slidably connected to the transfer tray via a sealing ring and a circular hole.

[0011] Furthermore, the top of the first spring installed inside the material trough is fixedly connected to the bottom of the material receiving plate, the side of the material receiving plate is slidably connected to the material trough through a sealing ring, the bottom of the material receiving plate and the lower part of the material trough form a sealed cavity, and the sealed cavity is connected to the first air hole and the second air hole.

[0012] Furthermore, the sorting mechanism includes a positioning plate, which is configured in two sections. Each section of the positioning plate has a positioning groove that matches both ends of the eye drop packaging box. Both ends of one section of the positioning plate are fixedly connected to a sliding plate, and both ends of the other section of the positioning plate have a sliding groove. A second spring is installed inside the sliding groove. The second spring is fixedly connected to the sliding plate, and one end of the sliding plate is slidably connected inside the sliding groove.

[0013] Furthermore, one end of the positioning plate and the sliding plate is fixedly connected to the connecting frame, and the other end of the positioning plate is slidably connected to the connecting frame.

[0014] Furthermore, the material transfer assembly has four inverted second trapezoidal blocks fixedly connected in a ring at equal intervals around the material transfer disc. The bending plate is L-shaped, and a first trapezoidal block is fixedly connected to one side of the bending plate. The center point of the first trapezoidal block is located below the second trapezoidal block.

[0015] Furthermore, the fixed base, the rotating disc, and the drive motor are coaxially arranged, and the edge of the fixed base is connected to the worktable by bolts.

[0016] Furthermore, it includes the following steps:

[0017] S10: Place the slender, tubular eye drop packaging box made of low-density polyethylene or polypropylene that needs to be inkjet printed on the upper end of the V-shaped plate on the corresponding side of the sorting mechanism.

[0018] The material can be fed by a robotic arm, manually, or by a vibratory feeder, and then placed into the V-shaped plate by gravity.

[0019] S20: After placement, the drive motor drives the material receiving component containing the eye drop packaging box to rotate. When the eye drop packaging box rotates to the position of the sorting mechanism, the second trapezoidal block set at the corresponding position contacts the first trapezoidal block and pushes the bending plate to move down as a whole. During the process of the bending plate moving down as a whole, the sorting mechanism is driven to move down through the connecting frame.

[0020] During the downward movement of the sorting mechanism, the position of the eye drop packaging box placed on the upper part of the V-shaped plate is calibrated by the positioning grooves opened inside the two positioning plates.

[0021] S30: After completing the position calibration, the eye drop packaging box moves towards the position of the ultraviolet laser head under the further drive of the drive motor;

[0022] S40: When the eye drop packaging box is completely moved to the position below the ultraviolet laser head, the lifting column contacts the moving column, the moving column pushes the material tray to move upward, and the upper end of the eye drop packaging box placed on the upper end of the V-shaped plate contacts the flattening frame and is flattened. Then the ultraviolet laser head prints the flattened position.

[0023] During this process, the sealed cavity formed by the bottom of the receiving tray and the lower part of the material trough is under negative pressure. The anti-slip groove is designed to prevent displacement during the flattening of the eye drop packaging box.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention achieves simultaneous rotation of multiple flexible tubes and synchronous coding of multiple ultraviolet laser heads through the cooperation of a ring-shaped transfer disc and four sets of material-bearing components, which greatly increases the output per unit time. At the same time, when the transfer disc rotates, the inclined plate of the trapezoidal block moves downward, driving the two-section elastic positioning plate to automatically perform flexible clamping and calibration of both ends of the flexible tube. The consistency of multiple sets of flexible tubes can be completed without additional power, which significantly reduces position deviation and missing code rate.

[0026] 2. This invention forms a sealed negative pressure cavity between the material receiving tray and the material trough. The adsorption force is transmitted to the anti-slip groove and arc-shaped sealing gasket on the surface of the V-shaped plate through the first and second air holes. This provides a stable adsorption force throughout the process of the hose being flattened, effectively preventing the hose from rolling or shifting. In addition, after the material receiving tray is lifted by the lifting column, the upper surface of the hose contacts the flattening frame with the hollow center and forms a locally flat area, ensuring that the ultraviolet laser focal length is constant and the inkjet characters are clear and sharp.

[0027] 3. The sorting, lifting, and flattening actions of this invention rely entirely on the rotational power of the transfer tray itself and the linkage of fixed lifting columns, trapezoidal blocks, and other mechanical components. No additional cylinders, motors, or sensors are required, which greatly simplifies the electrical control logic and equipment structure and is beneficial for maintaining a sterile environment. At the same time, each module is independently detachable, which facilitates quick replacement and cleaning and adapts to the production needs of hoses of different specifications. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the installation position of the lifting column of the present invention;

[0030] Figure 3 This is a schematic diagram of the installation position of the material-bearing component of the present invention;

[0031] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0032] Figure 5 This is a schematic diagram of the structure for the location of the circular hole in this invention;

[0033] Figure 6 This is a schematic diagram of the installation position structure of the drive motor of the present invention;

[0034] Figure 7 This is a schematic diagram of the material support component structure of the present invention;

[0035] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point C;

[0036] Figure 9 This is a schematic diagram of the material transfer assembly structure of the present invention;

[0037] Figure 10 This is a schematic diagram of the mechanism structure of the present invention;

[0038] Figure 11 For the present invention Figure 10 Enlarged structural diagram at point B.

[0039] In the diagram: 1. Fixed base; 2. Material transfer assembly; 21. Material transfer tray; 22. Material trough; 23. First spring; 24. Round hole; 3. Bending plate; 4. Material support assembly; 41. Material support tray; 42. V-groove; 43. First air hole; 44. V-shaped plate; 45. Anti-slip groove; 46. Second air hole; 47. Moving column; 5. Ultraviolet laser head; 6. Connecting frame; 7. Sorting mechanism; 71. Positioning plate; 72. Positioning groove; 73. Sliding plate; 74. Slide groove; 75. Second spring; 8. First trapezoidal block; 9. Elastic base; 10. Lifting column; 11. Eye drop packaging box; 12. Second trapezoidal block; 13. Drive motor; 14. Flattening frame. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figures 1-11As shown, the multi-group synchronous inkjet printer based on single-dose eye drop packaging provided in this embodiment includes a fixed base 1, an ultraviolet laser head 5, and a drive motor 13. The drive motor 13 is fixedly connected to the middle of the fixed base 1, and a lifting column 10 is fixedly connected to one side of the upper end of the fixed base 1. A material transfer assembly 2 is fixedly connected to the top of the main shaft of the drive motor 13. Four sets of material receiving assemblies 4 are installed on the upper end of the material transfer assembly 2 in a ring-shaped and equidistant arrangement. An eye drop packaging box 11 is placed on the upper end of the material receiving assembly 4. An elastic base 9 is fixedly connected to one side of the fixed base 1. One end of the elastic base 9 is connected to a movable curved plate 3 via a spring. The other end of the curved plate 3 is connected to a sorting mechanism 7 via a connecting frame 6. Multiple ultraviolet laser heads 5 for inkjet printing on the eye drop packaging box 11 are installed above the fixed base 1. A flattening frame 14 with a hollow center is installed on the outside of the ultraviolet laser head 5; the material receiving component 4 includes a material receiving tray 41, with multiple V-shaped grooves 42 on the inner side of the upper end of the material receiving tray 41, a first air hole 43 at the bottom end of the V-shaped grooves 42, a V-shaped plate 44 installed on the inner side of the upper end of the V-shaped grooves 42, anti-slip grooves 45 on both sides of the upper end of the V-shaped plate 44, a second air hole 46 at the bottom end of the V-shaped plate 44, and a moving column 47 fixedly connected to the middle of the bottom end of the material receiving tray 41. The material receiving component is driven by the material transfer component to achieve intermittent rotation of the ring-shaped material receiving component. With the coordinated action of the lifting column, the sorting mechanism and the flattening frame, multiple sets of single-dose eye drop packaging boxes can be automatically sorted, flattened and ultraviolet laser printed at the same time, which greatly improves the efficiency and positional consistency of multi-channel synchronous printing and reduces manual intervention.

[0042] In one possible embodiment, the V-shaped plate 44 has an arc-shaped bend in the middle, and the arc-shaped part of the V-shaped plate 44 is adapted to the eye drop packaging box 11. An arc-shaped sealing gasket is installed on the upper edge of the second air hole 46. The arc-shaped structure in the middle of the V-shaped plate fits perfectly with the shape of the eye drop tube, increasing the contact area and preventing rolling during printing. The arc-shaped sealing gasket can fit tightly against the bottom of the tube during negative pressure adsorption, ensuring airtightness, making the adsorption force uniform and stable, and preventing the tube from tilting.

[0043] In one possible embodiment, the material transfer assembly 2 includes a rotating disk 21 with a vertically circular projection. Four material slots 22 are provided on the inner side of the upper end of the rotating disk 21. Each of the four corners of the bottom of each material slot 22 is fixedly connected to a first spring 23. A circular hole 24 penetrating the rotating disk 21 is provided in the middle of the bottom of the material slot 22. The four material slots realize the rotation of the work position. The first spring at the bottom provides elastic support for the material support assembly, so that the material support disk maintains a stable sinking position when it is not subjected to the lifting force, which facilitates material loading and sorting. The circular hole provides a guide channel for the moving column to ensure that the lifting action is accurate and vertical.

[0044] In one possible embodiment, the bottom end of the moving column 47 and the upper end of the lifting column 10 are both arc-shaped. The lifting column 10 is positioned below the ultraviolet laser head 5. The moving column 47 is slidably connected to the transfer plate 21 through a sealing ring, a circular hole 24, and the arc-shaped contact surface reduces the sliding friction between the moving column and the lifting column, preventing jamming and ensuring a smooth lifting action. The sealing ring maintains the air passage seal while sliding, preventing negative pressure leakage and ensuring that the adsorption function remains effective throughout the lifting process.

[0045] In one possible embodiment, the top of the first spring 23 installed inside the material trough 22 is fixedly connected to the bottom of the material receiving tray 41, and the side of the material receiving tray 41 is slidably connected to the material trough 22 through a sealing ring. The bottom of the material receiving tray 41 and the lower part of the material trough 22 form a sealed cavity. The sealed cavity is connected to the first air hole 43 and the second air hole 46. The sliding sealing structure between the material receiving tray and the material trough uses the sealed cavity as a negative pressure air chamber, eliminating the need for an external rotary air connector and simplifying the structure. When the material receiving tray is lifted, the volume change of the sealed cavity can still maintain negative pressure, achieving dynamic adsorption and effectively preventing the packaging box from shifting during the inkjet printing flattening process.

[0046] In one possible embodiment, the sorting mechanism 7 includes a positioning plate 71, which is configured in two sections. Each section of the positioning plate 71 has a positioning groove 72 that fits both ends of the eye drop packaging box 11. Sliding plates 73 are fixedly connected to both ends of one section of the positioning plate 71, while sliding grooves 74 are provided at both ends of the other section. A second spring 75 is installed inside the sliding groove 74, and the second spring 75 is fixedly connected to the sliding plate 73. One end of the sliding plate 73 is slidably connected inside the sliding groove 74. This two-section retractable positioning plate can automatically adapt to different lengths of eye drop soft packaging boxes. The tube, with a spring providing flexible clamping force, accurately centers while avoiding hard squeezing that could damage the packaging; the sliding structure ensures smooth handling and is suitable for rapid specification changes in continuous production; one end of the positioning plate 71 and the sliding plate 73 is fixedly connected to the connecting frame 6, while the other end of the positioning plate 71 is slidably connected to the connecting frame 6. This installation method, with one end fixed and the other sliding, allows the two positioning plates to automatically open or retract to adapt to the actual position of the packaging box when the handling mechanism moves downward. At the same time, a constant centering force is provided by the second spring to avoid positioning failure due to manufacturing errors or gaps.

[0047] In one possible embodiment, the material transfer assembly 2 has four inverted second trapezoidal blocks 12 fixedly connected in a ring at equal intervals around the material transfer disk 21. The bending plate 3 is L-shaped, and a first trapezoidal block 8 is fixedly connected to one side of the bending plate 3. The center point of the first trapezoidal block 8 is located below the second trapezoidal block 12. By utilizing the rotational power of the material transfer disk itself, the bending plate is automatically driven to move downward through the cooperation of the inclined surfaces of the first and second trapezoidal blocks. The sorting mechanism can be linked without an additional power source, realizing precise synchronization between workstation switching and sorting, and reducing the complexity and cost of electrical control.

[0048] In one possible embodiment, the fixed base 1, the transfer tray 21, and the drive motor 13 are arranged coaxially. The edge of the fixed base 1 is connected to the worktable by bolts. The coaxial design ensures dynamic balance during the transfer process, reduces centrifugal vibration, and is conducive to the high-precision inkjet printing of the ultraviolet laser head on the micro-tube. The base is rigidly fixed to the worktable by bolts, and the whole machine operates stably, which is suitable for long-term high-speed continuous operation.

[0049] like Figures 1-11 As shown in this embodiment, the principle of using multiple synchronous inkjet printers based on single-dose eye drop packaging is as follows:

[0050] Includes the following steps:

[0051] S10: Place the slender, tubular eye drop packaging box 11, made of low-density polyethylene or polypropylene, which needs to be inkjet printed, on the upper end of the V-shaped plate 44 on the corresponding side of the sorting mechanism 7.

[0052] The material can be fed by a robotic arm, manually, or by a vibratory feeder into the V-shaped plate 44, where it sinks into the groove by gravity.

[0053] S20: After placement, the drive motor 13 drives the material-bearing component 4 containing the eye drop packaging box 11 to rotate. When the eye drop packaging box 11 rotates to the position of the sorting mechanism 7, the second trapezoidal block 12 set at the corresponding position contacts the first trapezoidal block 8 and pushes the bending plate 3 to move down as a whole. During the process of the bending plate 3 moving down as a whole, the sorting mechanism 7 is driven to move down through the connecting frame 6.

[0054] During the downward movement of the sorting mechanism 7, the position of the eye drop packaging box 11 placed on the upper end of the V-shaped plate 44 is calibrated by the positioning grooves 72 opened inside the two positioning plates 71.

[0055] S30: After completing the position calibration, the eye drop packaging box 11 moves towards the position of the ultraviolet laser head 5 under the further drive of the drive motor 11;

[0056] S40: When the eye drop packaging box 11 is completely moved to the position below the ultraviolet laser head 5, the lifting column 10 contacts the moving column 47, the moving column 47 pushes the material tray 41 to move upward, and the upper end of the eye drop packaging box 11 placed on the upper end of the V-shaped plate 44 contacts the flattening frame 14 and is flattened. Then the ultraviolet laser head 5 prints the flattened position.

[0057] During this process, the sealed cavity formed by the bottom of the material tray 41 and the lower part of the material trough 22 is under negative pressure. The anti-slip groove 45 is provided to prevent displacement during the flattening of the eye drop packaging box 11.

[0058] The process integrates feeding, automatic sorting, rotation, lifting and flattening, negative pressure adsorption, and multi-laser head marking into a fully automated cycle, which is especially suitable for mass production of single-dose tubing. Sorting and flattening are achieved through mechanical linkage, eliminating the need for additional sensors and complex logic control, greatly reducing the difficulty of equipment debugging, while ensuring the consistency and clarity of the marking position on each tubing.

[0059] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0060] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-group synchronous inkjet printer based on single-dose eye drop packaging, comprising a fixed base (1), an ultraviolet laser head (5), and a drive motor (13), characterized in that: A drive motor (13) is fixedly connected in the middle of the fixed base (1). A lifting column (10) is fixedly connected to one side of the upper end of the fixed base (1). A material transfer assembly (2) is fixedly connected to the top of the main shaft of the drive motor (13). Four sets of material support assemblies (4) are installed on the upper end of the material transfer assembly (2) in a ring. An eye drop packaging box (11) is placed on the upper end of the material support assembly (4). An elastic base (9) is fixedly connected to one side of the fixed base (1). One end of the elastic base (9) is connected to a bending plate (3) that can move up and down by a spring. The other end of the bending plate (3) is connected to a sorting mechanism (7) by a connecting frame (6). Multiple ultraviolet laser heads (5) for printing on the eye drop packaging box (11) are installed above the fixed base (1). A flattening frame (14) with a hollowed-out middle is installed on the outside of the multiple ultraviolet laser heads (5). The material receiving assembly (4) includes a material receiving tray (41), with multiple V-shaped grooves (42) on the inner side of the upper end of the material receiving tray (41), a first air hole (43) at the bottom end of the V-shaped groove (42), a V-shaped plate (44) installed on the inner side of the upper end of the V-shaped groove (42), anti-slip grooves (45) on both sides of the upper end of the V-shaped plate (44), a second air hole (46) at the bottom end of the V-shaped plate (44), and a movable column (47) fixedly connected to the middle of the bottom end of the material receiving tray (41).

2. The multi-group synchronous inkjet printer based on single-dose eye drop packaging according to claim 1, characterized in that: The V-shaped plate (44) has an arc-shaped bend in the middle, and the arc-shaped bend in the middle of the V-shaped plate (44) is adapted to the eye drop packaging box (11). An arc-shaped sealing gasket is installed on the upper edge of the second air hole (46).

3. The multi-group synchronous inkjet printer based on single-dose eye drop packaging according to claim 1, characterized in that: The material transfer assembly (2) includes a material transfer disk (21) with a vertical projection of a circle. Four material grooves (22) are opened on the inner side of the upper end of the material transfer disk (21). A first spring (23) is fixedly connected to the four corners of the bottom of any material groove (22). A circular hole (24) penetrating the material transfer disk (21) is opened in the middle of the bottom of the material groove (22).

4. The multi-group synchronous inkjet printer based on single-dose eye drop packaging according to claim 1, characterized in that: The bottom end of the moving column (47) and the top end of the lifting column (10) are both arc-shaped. The lifting column (10) is located below the ultraviolet laser head (5). The moving column (47) is slidably connected to the transfer plate (21) through the sealing ring, the round hole (24).

5. The multi-group synchronous inkjet printer based on single-dose eye drop packaging according to claim 3, characterized in that: The top of the first spring (23) installed inside the material trough (22) is fixedly connected to the bottom of the material receiving plate (41). The side of the material receiving plate (41) is slidably connected to the material trough (22) through a sealing ring. The bottom of the material receiving plate (41) and the lower part of the material trough (22) form a sealed cavity. The sealed cavity is connected to the first air hole (43) and the second air hole (46).

6. The multi-group synchronous inkjet printer based on single-dose eye drop packaging according to claim 1, characterized in that: The sorting mechanism (7) includes a positioning plate (71), which is set in two sections. Each section of the positioning plate (71) has a positioning groove (72) that is adapted to both ends of the eye drop packaging box (11). One section of the positioning plate (71) has a sliding plate (73) fixedly connected to both ends, and the other section of the positioning plate (71) has a sliding groove (74) opened at both ends. A second spring (75) is installed inside the sliding groove (74). The second spring (75) is fixedly connected to the sliding plate (73), and one end of the sliding plate (73) is slidably connected inside the sliding groove (74).

7. The multi-group synchronous inkjet printer based on single-dose eye drop packaging according to claim 6, characterized in that: One end of the positioning plate (71) and the sliding plate (73) is fixedly connected to the connecting frame (6), and the other end of the positioning plate (71) is slidably connected to the connecting frame (6).

8. The multi-group synchronous inkjet printer based on single-dose eye drop packaging according to claim 1, characterized in that: The material transfer assembly (2) has four inverted second trapezoidal blocks (12) fixedly connected in a ring at equal intervals around the material transfer disk (21) inside. The bending plate (3) is L-shaped and a first trapezoidal block (8) is fixedly connected to one side of the bending plate (3). The center point of the first trapezoidal block (8) is located below the second trapezoidal block (12).

9. The multi-group synchronous inkjet printer based on single-dose eye drop packaging according to claim 1, characterized in that: The fixed base (1), the transfer plate (21) and the drive motor (13) are coaxially arranged, and the edge of the fixed base (1) is connected to the worktable by bolts.

10. A method of using a multi-group synchronous inkjet printer based on a single-dose eye drop packaging as described in any one of claims 1-9, characterized in that: Includes the following steps: S10: Place the slender, tubular eye drop packaging box (11) made of low-density polyethylene or polypropylene that needs to be printed on the upper end of the V-shaped plate (44) on the corresponding side of the sorting mechanism (7). The material can be fed by a robotic arm, manually, or by a vibratory feeder into the V-shaped plate (44), where it sinks into the groove by gravity. S20: After placement, the drive motor (13) drives the material receiving component (4) containing the eye drop packaging box (11) to rotate. When the eye drop packaging box (11) rotates to the position of the sorting mechanism (7), the second trapezoidal block (12) set at the corresponding position contacts the first trapezoidal block (8) and pushes the bending plate (3) to move down as a whole. During the process of the bending plate (3) moving down as a whole, the sorting mechanism (7) is driven down through the connecting frame (6). During the downward movement of the sorting mechanism (7), the position of the eye drop packaging box (11) placed on the upper end of the V-shaped plate (44) is calibrated by the positioning groove (72) opened inside the two positioning plates (71); S30: After completing the position calibration, the eye drop packaging box (11) moves towards the position of the ultraviolet laser head (5) under the further drive of the drive motor (11); S40: When the eye drop packaging box (11) is completely moved to the position below the ultraviolet laser head (5), the lifting column (10) contacts the moving column (47), the moving column (47) pushes the material tray (41) to move upward, and the upper end of the eye drop packaging box (11) placed on the upper end of the V-shaped plate (44) contacts the flattening frame (14) and is flattened. Then the ultraviolet laser head (5) prints the flattened position. During this process, the sealed cavity formed by the bottom of the material tray (41) and the lower part of the material trough (22) is under negative pressure. The anti-slip groove (45) is provided to prevent displacement during the flattening of the eye drop packaging box (11).

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