A contact lens printing machine lens placing disc with negative pressure adsorption function

Abstract

The utility model relates to contact lens production and manufacturing equipment technical field, especially with a kind of contact lens printing machine lens placing tray of negative pressure adsorption function, the contact lens printing machine lens placing tray of negative pressure adsorption function includes shell body, porous adsorption core and negative pressure pipe, the buffer cavity is formed in the shell body inside hollow, the porous adsorption core detachably installed at the top of shell body, the utility model is supported by the support plate of entity by being set in the profiling concave center of porous adsorption core, cooperate the equalizing buffer design of internal buffer cavity, and the mechanical structure of "peripheral adsorption, center support" is constructed.Effective to prevent the soft contact lens from happening center collapse or irreversible deformation under the action of strong negative pressure, ensure the optical performance of lens and the integrity of printed pattern, simultaneously, the uniform negative pressure field formed by buffer cavity avoids the local wrinkling of lens, significantly improves the yield of product.

Description

Technical Field

[0001] This utility model relates to the technical field of contact lens manufacturing equipment, and in particular to a lens placement tray for a contact lens printing machine with negative pressure adsorption function. Background Technology

[0002] During the manufacturing process of contact lenses, it is common to color or print patterns on the lens surface (such as colored contact lenses). Pad printing is currently the most commonly used coloring method. The process involves placing the contact lens on a special placement tray, and then transferring ink to the lens surface using a pad printing nozzle. Because contact lenses are soft, have a high water content, and are extremely thin, the positioning accuracy on the placement tray directly determines the final printing quality and yield rate of the product.

[0003] Existing contact lens trays have the following main technical defects in practical use: It is prone to causing center deformation: Traditional negative pressure placement trays usually have a large through hole at the geometric center of the bearing surface to connect to the negative pressure source. When the negative pressure is turned on, the soft center part of the lens will be forcefully sucked into the through hole, causing irreversible concavity or deformation of the optical center of the lens. This not only affects the integrity of the printed pattern (causing the center of the pattern to collapse), but may also damage the optical performance of the lens.

[0004] Unstable positioning and easy slippage: Contact lenses to be processed usually contain preservation solution. Traditional placement trays have smooth surfaces or only simple frosting, which cannot quickly drain the liquid from the bottom of the lens. Residual liquid forms a "water film" between the lens and the placement tray, causing the lens to "float." When the pad printing head contacts the lens, it can easily cause slight displacement or rotation of the lens, resulting in printing misalignment (misalignment).

[0005] Therefore, it is necessary to provide a new lens placement tray for a contact lens printing machine with negative pressure adsorption function to solve the above-mentioned technical problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a lens placement tray for a contact lens printing machine with negative pressure adsorption function.

[0007] The contact lens printing machine lens placement tray with negative pressure adsorption function provided by this utility model includes: an outer shell, a porous adsorption core, and a negative pressure tube. The inner cavity of the outer shell is hollow to form a buffer cavity. The porous adsorption core is detachably installed on the top of the outer shell. The top surface of the porous adsorption core is a concave surface that conforms to the base curve of the contact lens. A plurality of adsorption holes are opened on the concave surface, extending to the bottom of the porous adsorption core. The adsorption holes are connected to the buffer cavity. A negative pressure tube communicating with the buffer cavity is provided on the side wall of the outer shell.

[0008] Preferably, the top inner wall of the outer shell is provided with an inwardly extending annular positioning plate, and the bottom of the porous adsorption core is provided with a fastening groove that cooperates with the positioning plate. The porous adsorption core is positioned and snapped onto the positioning plate through the fastening groove.

[0009] Preferably, the outer surface of the positioning plate is provided with a sealing ring.

[0010] Preferably, a support plate is fixedly connected to the center of the concave surface of the porous adsorption core, and the adsorption holes are distributed in a multi-ring concentric array around the support plate.

[0011] Preferably, the porous adsorption core has a plurality of liquid guiding grooves formed on its concave surface, and the liquid guiding grooves are distributed radially.

[0012] Preferably, the liquid guiding groove radiates outward from the center of the porous adsorption core, and the depth of the liquid guiding groove is less than the depth of the adsorption pore.

[0013] Preferably, the bottom of the buffer chamber is provided with a microporous sintered filter plate.

[0014] Compared with related technologies, the lens placement tray with negative pressure adsorption function for contact lens color printing machines provided by this utility model has the following beneficial effects: 1. This invention constructs a "peripheral adsorption, central support" mechanical structure by setting a solid support plate at the center of the concave surface of the porous adsorption core, combined with the pressure equalization buffer design of the internal buffer cavity. This effectively prevents the soft contact lens from collapsing or undergoing irreversible deformation under strong negative pressure, ensuring the optical performance of the lens and the integrity of the printed pattern. At the same time, the uniform negative pressure field formed by the buffer cavity avoids localized wrinkling of the lens, significantly improving the product yield.

[0015] 2. This invention solves the positioning and equipment protection problems caused by liquid residue by designing radially distributed liquid guiding grooves on the adsorption surface and embedding a microporous sintered filter plate in the gas path. The liquid guiding grooves utilize fluid dynamics principles to quickly discharge the storage liquid at the bottom of the lens, breaking up the slipping liquid film and achieving friction locking and precise positioning of the lens; while the microporous sintered filter plate achieves gas-liquid separation, effectively intercepting the sucked-in waste liquid and impurities, preventing them from entering the negative pressure pipeline and causing corrosion or blockage, thereby extending the service life of the vacuum equipment and reducing the maintenance frequency. Attached Figure Description

[0016] Figure 1 A schematic diagram of a preferred embodiment of the lens placement tray of a contact lens printing machine with negative pressure adsorption function provided by this utility model; Figure 2 This is a bottom view structural schematic diagram of the porous adsorption core in this utility model; The following are labeled in the diagram: 1. Negative pressure pipe; 2. Outer shell; 3. Positioning plate; 4. Buffer chamber; 5. Porous adsorption core; 6. Adsorption hole; 7. Liquid guiding groove; 8. Support plate; 9. Sealing ring; 10. Microporous sintered filter plate; 11. Fastening groove. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0019] Please see Figures 1 to 2 The present invention provides a lens placement tray for a contact lens printing machine with negative pressure adsorption function, which mainly includes an outer shell 2, a porous adsorption core 5, and a negative pressure tube 1.

[0020] The outer shell 2 serves as the base of the overall structure, and its interior is hollow, forming a buffer cavity 4. A negative pressure tube 1 is located on the side wall of the outer shell 2. One end of the negative pressure tube 1 penetrates the side wall and communicates with the internal buffer cavity 4, while the other end is used to connect to an external negative pressure generating device. A porous adsorption core 5 is detachably mounted on the top of the outer shell 2, and its top surface is designed as a concave surface conforming to the base curve of the contact lens. Several adsorption holes 6 are formed on the concave surface, extending to the bottom of the porous adsorption core 5. The bottom ends of these adsorption holes 6 are directly connected to the buffer cavity 4.

[0021] It should be noted that this split-type structural design facilitates the quick replacement of porous adsorption cores 5 with different radii of curvature during the production of contact lenses of different sizes. It also facilitates the cleaning and maintenance of the buffer chamber 4. The design of the buffer chamber 4 allows the airflow entering from the negative pressure tube 1 to be diffused and buffered within the chamber first, forming a uniform negative pressure field before acting on each adsorption hole 6. This avoids localized wrinkling of the lens due to excessive suction at a single point, effectively improving the flatness of the adsorption.

[0022] To ensure stable installation and sealing of the porous adsorption core 5, an inwardly extending annular positioning plate 3 is provided on the top inner wall of the outer casing 2. Correspondingly, a locking groove 11 matching the shape of the positioning plate 3 is provided at the bottom of the porous adsorption core 5. During installation, the porous adsorption core 5 is positioned and engaged on the positioning plate 3 through the locking groove 11, thereby limiting its radial and axial displacement. Simultaneously, a sealing ring 9 is provided on the outer surface of the positioning plate 3.

[0023] It should be noted that the presence of the sealing ring 9 is crucial for maintaining the negative pressure environment of the system. When the porous adsorption core 5 is pressed against the positioning plate 3, the sealing ring 9 undergoes elastic deformation to fill the gaps, blocking the path of outside air from the connection point into the buffer chamber 4, thus ensuring the efficiency and stability of the negative pressure adsorption.

[0024] To address the issue of lens center deformation, a support plate 8 is fixedly connected to the center of the concave surface of the porous adsorption core 5, and the adsorption holes 6 are distributed in a multi-ring concentric array around the support plate 8.

[0025] It should be noted that the support plate 8 provides solid physical support for the weakest optical center area of ​​the lens. When the negative pressure is turned on, the adsorption holes 6 adsorb the middle and peripheral parts and edges of the lens, while the center of the lens is in close contact with the support plate 8. This mechanical structure of "peripheral adsorption and central support" effectively prevents the center of the lens from sinking or undergoing irreversible deformation due to the negative pressure, thereby ensuring the integrity of the pattern and the optical quality of the lens in the subsequent pad printing process.

[0026] To address the issue of lens slippage due to liquid residue at the bottom in existing technologies, several liquid guiding grooves 7 are formed on the concave surface of the porous adsorption core 5. These grooves 7 are radially distributed, radiating outwards from the center of the porous adsorption core 5 and connecting to the adsorption holes 6 along the path. Furthermore, the depth of the liquid guiding grooves 7 is designed to be less than the depth of the adsorption holes 6.

[0027] It should be noted that, utilizing the principles of fluid dynamics, when a lens containing preservation fluid is placed on the fixture, the liquid guiding groove 7 creates a rapid flow channel. Under negative pressure, the liquid at the bottom of the lens rapidly converges along the radial liquid guiding groove 7 and flows into the adsorption hole 6 to be drawn away, thereby disrupting the liquid film layer that causes the lens to float and slide. This allows the lens to instantly form a stable frictional contact with the surface of the porous adsorption core 5, significantly improving positioning accuracy.

[0028] To protect the external negative pressure equipment, a microporous sintered filter plate 10 is provided at the bottom of the buffer chamber 4. The microporous sintered filter plate 10 is located on the airflow channel and is used to intercept the sucked-in storage liquid, ink residue or other production impurities, preventing them from entering the negative pressure pipe 1 and subsequent pipelines, thereby extending the service life of the equipment and reducing the maintenance frequency.

[0029] In summary, this utility model embodiment provides a lens placement tray for a contact lens printing machine with negative pressure adsorption function, employing a split structure design of the outer shell 2 and the porous adsorption core 5. A buffer cavity 4 is formed inside the outer shell 2, connected to an external negative pressure source via a negative pressure pipe 1. Airflow diffuses within the cavity, creating a uniform negative pressure field, preventing excessive suction at a single point from causing lens wrinkling. The porous adsorption core 5 is positioned and engaged with the annular positioning plate 3 inside the outer shell via a snap-fit ​​groove 11 at the bottom, and an airtight connection is achieved with a sealing ring 9. This ensures negative pressure stability and facilitates quick replacement of molds of different specifications and cleaning and maintenance.

[0030] To address issues related to lens positioning accuracy and product quality, this invention employs a "peripheral adsorption, central support" layout on the top surface of the porous adsorption core 5. A central solid support plate 8 prevents the optical center of the lens from collapsing and deforming due to negative pressure. Simultaneously, radial liquid-guiding grooves 7 connect to the adsorption holes 6, utilizing fluid dynamics principles to quickly guide and discharge the storage liquid at the bottom of the lens, disrupting liquid film slippage and achieving frictional locking of the lens. Furthermore, a microporous sintered filter plate 10 is specially integrated at the bottom of the buffer chamber 4. Its microporous structure effectively intercepts sucked-in liquid and ink impurities, achieving gas-liquid separation, preventing contaminants from entering the negative pressure pipeline, and significantly extending the service life of the vacuum equipment.

[0031] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A lens placement tray for a contact lens printing machine with negative pressure adsorption function, characterized in that, include: The outer shell (2) has a hollow interior forming a buffer cavity (4); A porous adsorption core (5) is detachably installed on the top of the outer shell (2). The top surface of the porous adsorption core (5) is a concave surface adapted to the base curve of the contact lens. Several adsorption holes (6) extending to the bottom of the porous adsorption core (5) are provided on the concave surface. The adsorption holes (6) are connected to the buffer cavity (4). Negative pressure pipe (1): The side wall of the outer shell (2) is provided with a negative pressure pipe (1) that communicates with the buffer cavity (4).

2. The lens placement tray of the contact lens printing machine with negative pressure adsorption function according to claim 1, characterized in that, The top inner wall of the outer shell (2) is provided with an inwardly extending annular positioning plate (3), and the bottom of the porous adsorption core (5) is provided with a fastening groove (11) that cooperates with the positioning plate (3). The porous adsorption core (5) is positioned and fastened to the positioning plate (3) through the fastening groove (11).

3. The lens placement tray of the contact lens printing machine with negative pressure adsorption function according to claim 2, characterized in that, The outer surface of the positioning plate (3) is provided with a sealing ring (9).

4. The lens placement tray of the contact lens printing machine with negative pressure adsorption function according to claim 1, characterized in that, A support plate (8) is fixedly connected to the center of the concave surface of the porous adsorption core (5), and the adsorption holes (6) are distributed in a multi-ring concentric array around the support plate (8).

5. The lens placement tray of the contact lens printing machine with negative pressure adsorption function according to claim 1, characterized in that, The porous adsorption core (5) also has several liquid guiding grooves (7) on its concave surface, and the liquid guiding grooves (7) are radially distributed.

6. The lens placement tray of the contact lens printing machine with negative pressure adsorption function according to claim 5, characterized in that, The liquid guiding groove (7) radiates outward from the center of the porous adsorption core (5), and the depth of the liquid guiding groove (7) is less than the depth of the adsorption hole (6).

7. The lens placement tray of the contact lens printing machine with negative pressure adsorption function according to claim 1, characterized in that, The bottom of the buffer chamber (4) is provided with a microporous sintered filter plate (10).

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