A mold for a toric surface of a multifocal contact lens

Abstract

The utility model belongs to contact lens mold technical field especially a kind of for multifocal contact lens ring curved surface mould, including base, the base top outer wall is welded with top frame, and the top frame top outer wall is fixedly connected with electric push rod by screw, the electric push rod piston rod is fixedly connected with top die, and the both sides outer wall of top die is welded with side pull piece, the base top outer wall is fixedly connected with bottom die by screw, and the bottom die bottom inner wall is slidably connected with the top pin of array distribution, the top pin bottom outer wall is welded with connecting disc, and spring is fixedly connected between connecting disc and base. The utility model does not need artificial manual to pick, avoids the extrusion deformation caused by artificial operation to lens, simultaneously saves the time of manual material taking, greatly improves production efficiency, entire material moving process does not need artificial intervention, simultaneously, the positioning of chuck driven by pneumatic cylinder is accurate, guarantees the consistency of material moving position, provides safeguard for the smooth performance of subsequent procedure.

Description

Technical Field

[0001] This utility model relates to the field of contact lens mold technology, and in particular to a mold for the torus surface of multifocal contact lenses. Background Technology

[0002] Multifocal contact lenses are optical lenses that can simultaneously correct multiple vision problems such as myopia, hyperopia, and astigmatism. Their torus surface design is crucial to their optical performance and requires precise molding using specialized molds. These molds typically consist of core components such as a top mold, a bottom mold, and a cavity. Lens production is completed through processes such as mold closing, raw material injection, and curing. These molds are key equipment for the large-scale manufacturing of multifocal contact lenses.

[0003] In actual production, existing molds have some shortcomings: First, after the mold is opened, the lens is easy to stick to the inner wall of the bottom mold and needs to be removed manually. This is not only inefficient, but also easy to cause lens deformation or contamination due to improper operation, which affects the product qualification rate. In addition, the lack of an automatic material transfer structure is not conducive to the efficient connection of subsequent processes. Utility Model Content

[0004] In view of the shortcomings of the prior art, this utility model provides a mold for the torus surface of multifocal contact lenses, which overcomes the shortcomings of the prior art and effectively solves the problems of low efficiency and easy damage to lenses caused by the need for manual material handling after mold opening.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A mold for the torus surface of multifocal contact lenses includes a base, a top frame welded to the top outer wall of the base, and an electric push rod fixedly connected to the top outer wall of the top frame by screws. The piston rod of the electric push rod is fixedly connected to a top mold, and side pull tabs are welded to both outer walls of the top mold. A bottom mold is fixedly connected to the top outer wall of the base by screws, and an array of ejector pins is slidably connected to the bottom inner wall of the bottom mold. A connecting plate is welded to the bottom outer wall of the ejector pins, and a spring is fixedly connected between the connecting plate and the base. U-shaped rods are welded to both ends of the top outer wall of the connecting plate, and the U-shaped rods are inserted through the inner wall of the side pull tabs.

[0006] Preferably, the bottom outer wall of the base is welded with symmetrically distributed L-shaped limiting plates, and the L-shaped limiting plates are tightly attached to the bottom outer wall of the connecting plate.

[0007] Preferably, a cavity is provided between the top mold and the bottom mold, and a feed pipe is fixedly connected to the center of the bottom outer wall of the bottom mold, and the feed pipe and the cavity are interconnected.

[0008] Preferably, a corner bracket is installed on the top outer wall of the base on one side of the bottom mold, and a cylinder is fixedly connected to the top outer wall of the corner bracket by screws, and a clamp is fixedly connected to the piston rod of the cylinder.

[0009] Preferably, guide rods are provided at the four corners of the bottom outer wall of the top mold, and positioning holes are provided at the four corners of the top outer wall of the bottom mold, with the guide rods and positioning holes corresponding one-to-one.

[0010] Preferably, a control cabinet is provided on the bottom outer wall of the base, and a sub-control switch is provided on one side of the outer wall of the control cabinet. The sub-control switch is connected to the electric push rod and the cylinder through a signal line.

[0011] Preferably, the spring, connecting plate, ejector pin, and L-shaped limiting plate are all located inside the control cabinet.

[0012] The beneficial effects of this utility model are as follows: 1. The mold designed for the toroidal surface of multifocal contact lenses has the following characteristics: When the electric push rod moves the top mold upward, the side pull tabs on both sides of the top mold rise accordingly. Through cooperation with the U-shaped rod, the connecting plate moves upward, and the connecting plate moves the ejector pin upward synchronously. The ejector pin can directly push the formed lens out of the cavity of the bottom mold without manual removal, avoiding the squeezing and deformation of the lens caused by manual operation. At the same time, it saves the time of manual material removal and greatly improves production efficiency. 2. The mold designed for the torus surface of multifocal contact lenses has a cylinder piston rod that pushes the chuck to the lens position after the ejector pin pushes the lens out. The chuck can accurately hold the lens and transfer it to the designated position. The entire material transfer process does not require manual intervention. At the same time, the cylinder-driven chuck is accurately positioned, ensuring the consistency of the material transfer position and providing a guarantee for the smooth progress of subsequent processes. Attached Figure Description

[0013] Figure 1 This is an overall schematic diagram of the top and bottom molds of a mold for a toroidal surface of a multifocal contact lens proposed in this utility model when closed; Figure 2 This is an overall schematic diagram of the top mold and bottom mold when separating a mold for the torus surface of a multifocal contact lens according to the present invention; Figure 3 This is an overall schematic diagram of the ejector pin of a mold for a multifocal contact lens torus surface proposed in this utility model when ejecting the lens. Figure 1 ; Figure 4 This is an overall schematic diagram of the ejector pin of a mold for a multifocal contact lens torus surface proposed in this utility model when ejecting the lens. Figure 2 ; Figure 5This is an overall schematic diagram of a cylinder-driven chuck for removing a lens from a mold for a toroidal surface of a multifocal contact lens, as proposed in this utility model. Figure 6 This is a schematic diagram of the base connection structure of a mold for a toroidal surface of a multifocal contact lens proposed in this utility model.

[0014] In the diagram: 1. Base; 2. Electric push rod; 3. Top mold; 4. Side pull plate; 5. Bottom mold; 6. Spring; 7. Connecting plate; 8. Ejector pin; 9. U-shaped rod; 10. L-shaped limit plate; 11. Feed pipe; 12. Cavity; 13. Angle code; 14. Cylinder; 15. Chuck; 16. Guide rod; 17. Positioning hole; 18. Control cabinet; 19. Sub-control switch; 20. Top frame. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] Reference Figures 1-6 Example 1: A mold for the toroidal surface of a multifocal contact lens includes a base 1. A top frame 20 is welded to the top outer wall of the base 1, and an electric push rod 2 is fixedly connected to the top outer wall of the top frame 20 by screws. A top mold 3 is fixedly connected to the piston rod of the electric push rod 2, and side pull tabs 4 are welded to both outer walls of the top mold 3. A bottom mold 5 is fixedly connected to the top outer wall of the base 1 by screws, and an array of ejector pins 8 are slidably connected to the bottom inner wall of the bottom mold 5. A connecting plate 7 is welded to the bottom outer wall of the ejector pins 8, and a spring 6 is fixedly connected between the connecting plate 7 and the base 1. U-shaped rods 9 are welded to both ends of the top outer wall of the connecting plate 7, and the U-shaped rods 9 are inserted through the inner wall of the side pull tabs 4.

[0017] Through the above scheme, the top frame 20 is fixed to the base 1 by welding to ensure that the electric push rod 2 is firmly installed. The electric push rod 2 is used to control the lifting and lowering of the top mold 3 to realize the opening and closing of the mold. The cooperation design of the side pull plate 4 and the U-shaped rod 9 can convert the lifting and lowering motion of the top mold 3 into the up and down movement of the connecting plate 7, which in turn drives the ejector pin 8 to move. The array of ejector pins 8 can act evenly on the bottom of the lens to ensure that the lens is under balanced force when ejected. When the top mold 3 is lowered and the mold is closed, the spring 6 drives the connecting plate 7 and the ejector pin 8 to reset through its own elasticity to ensure that the next molding process is carried out normally.

[0018] In embodiment 2, a corner bracket 13 is installed on the top outer wall of the base 1 on one side of the bottom mold 5, and a cylinder 14 is fixedly connected to the top outer wall of the corner bracket 13 by screws, and a chuck 15 is fixedly connected to the piston rod of the cylinder 14.

[0019] Through the above scheme, the extension and retraction of the piston rod of cylinder 14 can control the movement of chuck 15. When chuck 15 is holding the lens, it realizes the safe transfer of the formed lens, replacing manual material transfer.

[0020] The base 1 has symmetrically distributed L-shaped limiting plates 10 welded to its bottom outer wall, and the L-shaped limiting plates 10 are tightly attached to the bottom outer wall of the connecting plate 7.

[0021] Through the above solution, the L-shaped limiting plate 10 is fixed to the bottom of the base 1 by welding. Its tight fit with the bottom of the connecting plate 7 can accurately limit the downward position of the connecting plate 7, preventing the connecting plate 7 and the ejector pin 8 from moving too far down due to the excessive reset of the spring 6. This ensures that the ejector pin 8 can be completely retracted into the bottom mold 5 in the mold closing state, without affecting the molding space of the cavity 12, thereby ensuring the dimensional accuracy of the lens.

[0022] A cavity 12 is provided between the top mold 3 and the bottom mold 5, and a feed pipe 11 is fixedly connected to the center of the bottom outer wall of the bottom mold 5. The feed pipe 11 and the cavity 12 are interconnected.

[0023] Through the above-described scheme, the shape of cavity 12 perfectly matches the torus structure of multifocal contact lenses, making it the core area for lens molding. The feed tube 11 is connected to cavity 12, facilitating the precise injection of molten lens material into cavity 12.

[0024] Guide rods 16 are provided at the four corners of the bottom outer wall of the top mold 3, and positioning holes 17 are provided at the four corners of the top outer wall of the bottom mold 5. The guide rods 16 and the positioning holes 17 correspond one-to-one.

[0025] Through the above-described design, the one-to-one correspondence between the guide rod 16 and the positioning hole 17 serves as a guide and positioner during the descent and closing of the top mold 3. The insertion of the guide rod 16 into the positioning hole 17 ensures precise alignment between the top mold 3 and the bottom mold 5, preventing misalignment during mold closing and thus guaranteeing the sealing of the cavity 12 and the accuracy of the molding dimensions.

[0026] A control cabinet 18 is installed on the bottom outer wall of the base 1, and a sub-control switch 19 is installed on one side of the outer wall of the control cabinet 18. The sub-control switch 19 is connected to the electric push rod 2 and the cylinder 14 through a signal line. The spring 6, the connecting plate 7, the ejector pin 8 and the L-shaped limit plate 10 are all located inside the control cabinet 18.

[0027] Through the above-described scheme, the control cabinet 18 provides protection for internal components such as the spring 6 and connecting plate 7, preventing external dust and impurities from entering and affecting the movement accuracy of the components. It also provides some sound insulation and safety protection. The individual control switch 19 is connected to the electric push rod 2 and cylinder 14 via signal lines. Operators can control the opening and closing of the mold and the material transfer action through the individual control switch 19, ensuring the orderly progress of the process.

[0028] Working Principle: The operation of this mold mainly consists of four stages: mold closing, material feeding and forming, mold opening and ejection, and material transfer. First, the electric push rod 2 is activated by the sub-control switch 19 on the control cabinet 18. The piston rod of the electric push rod 2 pushes the top mold 3 downward. The guide rod 16 at the bottom of the top mold 3 is aligned with the positioning hole 17 of the bottom mold 5 and inserted, achieving precise mold closing between the top mold 3 and the bottom mold 5. After mold closing is completed, the lens material is injected into the cavity 12 through the feed pipe 11 at the bottom of the bottom mold 5. After the material solidifies and forms in the cavity 12, the mold opening and ejection stage begins.

[0029] Next, the piston rod of the electric push rod 2 rises, driving the top mold 3 to move upward. The side pull plates 4 on both sides of the top mold 3 rise synchronously, pulling the connecting plate 7 upward through the through U-shaped rod 9. The connecting plate 7 drives the array of ejector pins 8 to move upward, ejecting the lens formed in the cavity 12.

[0030] Finally, the piston rod of cylinder 14 pushes the chuck 15 to move to the ejected lens. After the chuck 15 holds the lens, it transfers the lens to the designated position, completing the material transfer.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A mold for the torus surface of a multifocal contact lens, comprising a base (1), characterized in that, The base (1) has a top frame (20) welded to its top outer wall, and an electric push rod (2) is fixedly connected to the top outer wall of the top frame (20) by screws. The piston rod of the electric push rod (2) is fixedly connected to the top mold (3), and side pull plates (4) are welded to both outer walls of the top mold (3). The base (1) has a bottom mold (5) fixedly connected to its top outer wall by screws, and an array of ejector pins (8) are slidably connected to the bottom inner wall of the bottom mold (5). A connecting plate (7) is welded to the bottom outer wall of the ejector pins (8), and a spring (6) is fixedly connected between the connecting plate (7) and the base (1). U-shaped rods (9) are welded to both ends of the top outer wall of the connecting plate (7), and the U-shaped rods (9) are inserted through the inner wall of the side pull plates (4).

2. The mold for the torus surface of a multifocal contact lens according to claim 1, characterized in that, The base (1) has symmetrically distributed L-shaped limiting plates (10) welded to its bottom outer wall, and the L-shaped limiting plates (10) are tightly attached to the bottom outer wall of the connecting plate (7).

3. A mold for the torus surface of a multifocal contact lens according to claim 1, characterized in that, A cavity (12) is provided between the top mold (3) and the bottom mold (5), and a feed pipe (11) is fixedly connected to the center of the bottom outer wall of the bottom mold (5). The feed pipe (11) and the cavity (12) are interconnected.

4. A mold for the torus surface of a multifocal contact lens according to claim 1, characterized in that, An angle bracket (13) is installed on the top outer wall of the base (1) on one side of the bottom mold (5), and a cylinder (14) is fixedly connected to the top outer wall of the angle bracket (13) by screws. The piston rod of the cylinder (14) is fixedly connected to a chuck (15).

5. A mold for the torus surface of a multifocal contact lens according to claim 1, characterized in that, The top mold (3) has guide rods (16) at the four corners of its bottom outer wall, and the bottom mold (5) has positioning holes (17) at the four corners of its top outer wall. The guide rods (16) and positioning holes (17) correspond one-to-one.

6. A mold for the torus surface of a multifocal contact lens according to claim 1, characterized in that, The base (1) has a control cabinet (18) on its bottom outer wall, and a sub-control switch (19) is provided on one side of the outer wall of the control cabinet (18). The sub-control switch (19) is connected to the electric push rod (2) and the cylinder (14) via a signal line.

7. A mold for the torus surface of a multifocal contact lens according to claim 2, characterized in that, The spring (6), connecting plate (7), ejector pin (8) and L-shaped limiting plate (10) are all located inside the control cabinet (18).

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