Corneal contact lens base material forming mold

Abstract

The utility model relates to the technical field of manufacturing of corneal contact lenses, in particular to a corneal contact lens base material forming mold which comprises a base, a mold body, a base material pressing plate, a base material pressing plate, a base material pressing plate, a base material pressing plate, a base material pressing plate and a base material pressing plate. The traction hole is used for matched positioning; the forming seat and the material taking seat are both arranged above the mold, forming bosses and traction rods used for being matched with the traction holes to achieve positioning are arranged at the bottoms of the forming seat and the material taking seat, and negative pressure holes used for sucking formed base materials through negative pressure are formed in the surfaces of the forming bosses located at the bottom of the material taking seat; by arranging the mold, the forming base, the material taking base, the corresponding positioning mechanism, the corresponding pressing mechanism and the corresponding heating mechanism, the automatic forming and demolding process of the corneal contact lens base material is achieved.

Description

Technical Field

[0001] This utility model relates to the field of corneal contact lens manufacturing technology, and in particular to a corneal contact lens substrate molding mold. Background Technology

[0002] Currently, contact lenses, as optical corrective devices worn directly on the cornea of ​​the eye, have become an important choice for patients with refractive errors such as myopia, hyperopia, and astigmatism due to their aesthetic appeal, convenience, and advantages in terms of field of vision and optical corrective performance. In the production process of contact lenses, the design and manufacturing of the molding die is one of the key steps.

[0003] Traditional molding dies typically require alignment between the molding head or feed seat and the die when molding corneal contact lens substrates. However, because traditional dies often lack effective limiting and alignment mechanisms, misalignment easily occurs during operation, especially when the molding head or feed seat needs to be precisely aligned with the material groove on the die. This misalignment leads to uneven material distribution, affecting the precise extrusion of the material by the molding boss, and directly impacting the molding quality of the corneal contact lens substrate. This can result in defects such as uneven thickness and shape deviations, making it difficult to meet the consistency and high-quality requirements of modern mass production.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a corneal contact lens substrate molding mold.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a corneal contact lens substrate molding mold, including a base, the top of which is fixedly connected to a top seat via a bracket, and further including:

[0007] A mold is set on top of the base. The mold has a material tank for holding corneal contact lens material and a traction hole for positioning.

[0008] The forming seat and the material taking seat are both located above the mold. The bottom of the forming seat and the material taking seat are provided with forming bosses and traction rods for cooperating with the traction hole to achieve positioning. The surface of the forming boss located at the bottom of the material taking seat is provided with negative pressure holes for sucking up the formed substrate through negative pressure.

[0009] A positioning mechanism, connected to the molding seat and the material taking seat, and connected to the motor shaft of an external motor, is used to selectively move the molding seat or the material taking seat directly above the mold and limit it in the vertical direction;

[0010] A clamping mechanism, disposed on the top seat, is used to apply a downward clamping force to the forming seat or the material taking seat located above the mold;

[0011] A heating mechanism is installed on the forming base and is used to heat the raw material in the material tank.

[0012] Furthermore, the positioning mechanism includes a connecting frame that is connected to the forming seat and the material taking seat. The connecting frame is connected to a motor shaft to drive the forming seat and the material taking seat to rotate horizontally.

[0013] More specifically, the connecting frame is provided with a limiting groove for vertical positioning, and a limiting rod is slidably arranged in the limiting groove. The limiting rod is fixedly connected to the end of the motor shaft.

[0014] Preferably, both the limiting groove and the limiting rod are rectangular.

[0015] Furthermore, a spring is installed between the connecting frame and the motor shaft. The spring is sleeved on the surface of the limiting rod. The spring is used to provide an upward restoring force to the connecting frame and the forming seat or the material taking seat connected to the connecting frame after the clamping mechanism is released.

[0016] Furthermore, the heating mechanism includes a light-transmitting glass, a mounting bracket, and a heating lamp. The light-transmitting glass is disposed in the middle of the molding base, the mounting bracket is disposed on the top of the molding base on one side of the light-transmitting glass, and the heating lamp is mounted on the mounting bracket.

[0017] Furthermore, the negative pressure hole on the material receiving seat is connected to a negative pressure box via a shaped boss, and the negative pressure box is connected to a negative pressure pump installed on the material receiving seat via a three-way connector.

[0018] More specifically, the mold is equipped with two sets of material troughs, and the molding seat and the material taking seat are equipped with two sets of molding bosses and two sets of traction rods. The pipes connecting the two sets of negative pressure boxes of the tee joint are equipped with pressure relief valves to relieve pressure and assist in the removal of corneal contact lenses.

[0019] Furthermore, the support includes at least two vertical rods.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] By setting up a mold, forming seat, material handling seat, and corresponding positioning, clamping, and heating mechanisms, the automated forming and demolding process of corneal contact lens substrates is realized. Addressing the problem of misalignment between the forming seat and the mold in existing technologies, which affects forming quality, this invention effectively solves the problem of misalignment between the forming seat or material handling seat and the mold through the cooperation of traction rods and traction holes on the forming seat and the mold, as well as the vertical limiting provided by the positioning mechanism. This ensures that the forming boss can be precisely aligned with the material groove on the mold, thereby improving the forming accuracy and product quality of the corneal contact lens substrate. Furthermore, the heating mechanism integrated on the forming seat can accelerate the heating of the raw material, improving forming efficiency and promoting uniform heating. The negative pressure system on the material handling seat enables efficient and non-destructive demolding of the substrate after forming, overcoming the shortcomings of traditional manual demolding, which is inefficient and prone to damaging the substrate. Overall, this invention has a compact structure, is easy to operate, and significantly improves the forming efficiency and product quality of corneal contact lens substrates. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of a corneal contact lens substrate molding die.

[0023] Figure 2 This is a schematic diagram of the mold structure for forming a corneal contact lens substrate.

[0024] Figure 3 This is a schematic diagram of the distribution structure of the molding boss and traction rod in a corneal contact lens substrate molding mold.

[0025] Figure 4 This is a schematic diagram of the molding base structure of a corneal contact lens substrate molding die.

[0026] Figure 5 This is a schematic diagram of the negative pressure hole distribution structure of a corneal contact lens substrate molding die.

[0027] Figure 6 This is a schematic diagram of the material feeding seat structure of a corneal contact lens substrate molding die.

[0028] Figure 7 This is a schematic diagram of the connecting frame structure of a corneal contact lens substrate molding die.

[0029] In the diagram: 1. Base; 11. Mold; 12. Material trough; 13. Traction hole; 14. Bracket; 15. Top seat; 16. Electric push rod; 2. Forming seat; 21. Material picking seat; 22. Traction rod; 23. Forming boss; 24. Translucent glass; 25. Mounting bracket; 26. Heating lamp; 27. Top cover; 211. Negative pressure hole; 212. Negative pressure box; 213. Negative pressure pump; 214. T-connector; 3. Connecting bracket; 31. Limiting groove; 32. Limiting rod; 33. Motor shaft; 34. Spring. Detailed Implementation

[0030] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0031] In the manufacturing of corneal contact lenses, the design and performance of the molding die directly affect product quality and production efficiency. Traditional molding dies, in the process of molding raw materials into corneal contact lens substrates, often rely on operator experience for alignment or lack precise mechanical limiting structures, leading to misalignment between the molding seat or material feeder and the material groove on the mold. This misalignment not only affects the uniform distribution and precise molding of the raw material but may also reduce the optical performance and wearing comfort of the final product, making it difficult to meet the demands of modern automated and high-precision production. To overcome the problems of inaccurate alignment, low molding efficiency, and difficult demolding in existing technologies, this invention proposes a corneal contact lens substrate molding die. This die integrates key components such as the mold, molding seat, material feeder, positioning mechanism, clamping mechanism, and heating mechanism, and cleverly designs the cooperation relationships between these components. In particular, the cooperation between the traction rod and the traction hole, as well as the vertical limiting of the positioning mechanism, effectively solves the alignment problem during the molding process, improves molding accuracy and efficiency, and achieves efficient and non-destructive automated demolding.

[0032] like Figures 1 to 7 The corneal contact lens substrate molding mold shown includes a base 1, a top seat 15 fixedly connected to the top of the base 1 via a bracket 14, and further includes:

[0033] Mold 11 is set on the top of base 1. Inside mold 11 is a material trough 12 for holding corneal contact lens material and a traction hole 13 for positioning.

[0034] The molding seat 2 and the material taking seat 21 are both located above the mold 11. The bottom of the molding seat 2 and the material taking seat 21 are provided with molding bosses 23 and traction rods 22 for cooperating with traction holes 13 to achieve positioning. The surface of the molding bosses 23 located at the bottom of the material taking seat 21 is provided with negative pressure holes 211 for sucking up the molded substrate by negative pressure.

[0035] The positioning mechanism is connected to the molding seat 2 and the material take-up seat 21, and is connected to the motor shaft 33 of the external motor. It is used to selectively move the molding seat 2 or the material take-up seat 21 directly above the mold 11 and limit it in the vertical direction.

[0036] A clamping mechanism is provided on the top seat 15 for applying a downward clamping force to the forming seat 2 or the material taking seat 21 located above the mold 11. The clamping mechanism includes an electric push rod 16 fixedly installed on the top of the top seat 15. The piston rod of the electric push rod 16 passes through the top seat 15 and extends downward before being fixedly installed with a clamping plate.

[0037] A heating mechanism is installed on the forming base 2 and is used to heat the raw materials in the material tank 12.

[0038] Compared with existing technologies, the corneal contact lens substrate molding die of this invention has significant advantages. Traditional molds are prone to misalignment between the molding seat and the mold during the molding process, leading to unstable product quality. This invention, by setting a traction rod 22 at the bottom of the molding seat and the material taking seat, and setting a traction hole 13 on the mold 11 to cooperate with the traction rod 22, allows the molding seat 2 or the material taking seat 21 to achieve precise guidance and alignment by inserting the traction rod 22 into the traction hole 13 during descent. At the same time, the vertical limiting provided by the positioning mechanism further ensures that the molding seat 2 or the material taking seat 21 can only move along a predetermined vertical path during the pressing process, effectively preventing horizontal deviation. Thus, this invention can significantly improve the alignment accuracy of the molding process, ensure that the raw material is accurately molded in the material tank 12, thereby improving the molding quality of the corneal contact lens substrate and reducing the scrap rate. In addition, the heating mechanism integrated on the molding seat 2 can accelerate the curing process of the raw material, shorten the molding cycle, and improve production efficiency. The negative pressure demolding system on the material handling seat 21 enables efficient and non-destructive removal of the substrate after molding, avoiding the damage that may be caused by traditional manual demolding, and further improving production efficiency and product qualification rate.

[0039] As one embodiment of this utility model, the positioning mechanism includes a connecting frame 3, which is connected to the forming seat 2 and the material taking seat 21. The connecting frame 3 is connected to the motor shaft 33 to drive the forming seat 2 and the material taking seat 21 to perform horizontal rotation switching.

[0040] In implementation, the connecting frame 3 can be designed with an arm connecting the molding seat 2 and the material take-up seat 21, and a central portion connecting the motor shaft 33. The motor shaft 33 is typically driven by an external motor, which can be a stepper motor or a servo motor, to precisely control the rotation angle and position. By employing a positioning mechanism that connects the connecting frame 3 to the motor shaft 33 to drive the molding seat 2 and the material take-up seat 21 to rotate horizontally, this invention provides a specific and efficient station switching solution. This embodiment clarifies that the switching between molding and material take-up stations is achieved through rotation, resulting in a relatively compact and easy-to-control structure. Therefore, this technical solution ensures that the molding seat and the material take-up seat can move quickly and accurately to the required position above the mold, providing a reliable positioning basis for subsequent pressing and operation, further improving the automation level and working efficiency of the entire molding die.

[0041] As one embodiment of this utility model, the connecting frame 3 is provided with a limiting groove 31 for vertical positioning, and a limiting rod 32 is slidably arranged in the limiting groove 31. The limiting rod 32 is fixedly connected to the end of the motor shaft 33.

[0042] In practice, by setting a limiting groove 31 on the connecting frame 3 and setting a limiting rod 32 that cooperates with the limiting groove 31 at the end of the motor shaft 33, this utility model provides a simple and effective vertical limiting structure. This structure ensures that the movement path of the forming seat 2 or the material taking seat 21 is precisely limited in the vertical direction when it is pressed down by the pressing mechanism.

[0043] In one embodiment of this utility model, both the limiting groove 31 and the limiting rod 32 are rectangular.

[0044] As one embodiment of this utility model, a spring 34 is also installed between the connecting frame 3 and the motor shaft 33. The spring 34 is sleeved on the surface of the limiting rod 32. The spring 34 is used to provide an upward restoring force to the connecting frame 3 and the forming seat 2 or the material taking seat 21 connected thereto after the clamping mechanism is released.

[0045] In practice, the spring 34 is typically a compression spring. When the clamping mechanism applies a downward clamping force to the forming seat 2 or the material take-up seat 21 located above the mold 11, the connecting frame 3 moves downward along with the forming seat 2 or the material take-up seat 21. During this process, the connecting frame 3 compresses the spring 34 downward. When the clamping mechanism releases the pressure, the compressed spring 34 rebounds, generating an upward restoring force. This restoring force acts on the connecting frame 3, thereby causing the forming seat 2 or the material take-up seat 21 connected to the connecting frame 3 to move upward, lifting it from above the mold 11 and returning it to its initial position.

[0046] As one embodiment of this utility model, the heating mechanism includes a light-transmitting glass 24, a mounting frame 25, and a heating lamp 26. The light-transmitting glass 24 is disposed in the middle of the molding base 2, the mounting frame 25 is disposed on the top of the molding base 2 on one side of the light-transmitting glass 24, and the heating lamp 26 is mounted on the mounting frame 25. A top cover 27 is also fixedly installed on the molding base 2, and the top cover 27 is used to protect the heating lamp 26.

[0047] In implementation, the translucent glass 24 acts as a window, allowing heat or light emitted by the heating lamp 26 to penetrate the molding base 2 and directly act on the raw material in the mold 11 below. The translucent glass 24 needs to have good light transmittance and heat resistance. The mounting bracket 25 provides a mounting platform and support structure for the heating lamp 26, ensuring that the heating lamp 26 can be stably fixed on the molding base 2 and positioned above or to one side of the translucent glass 24, so that the heat it emits can be effectively transferred through the translucent glass 24. Compared to solutions without an integrated heating mechanism, this structure can directly apply heat to the raw material in the mold, accelerating the curing process and significantly shortening the molding cycle. Simultaneously, because the heating lamp 26 is close to the raw material, the heat transfer efficiency is high, which helps the raw material to be heated evenly, thereby improving the molding quality. Therefore, this technical solution effectively improves the production efficiency and product quality of corneal contact lens substrates by optimizing the heating method.

[0048] In one embodiment of this utility model, the negative pressure hole 211 on the material taking seat 21 is connected to the negative pressure box 212 by means of the forming boss 23, and the negative pressure box 212 is connected to the negative pressure pump 213 installed on the material taking seat 21 through the three-way connector 214.

[0049] In practice, the negative pressure holes 211 are tiny pores that directly contact the surface of the molded corneal contact lens substrate, used to adsorb the substrate under negative pressure. These negative pressure holes 211 are connected to the negative pressure box 212 through a pre-set flow channel inside the molding boss 23. The negative pressure box 212 acts as a buffer and collects negative pressure, ensuring that the negative pressure can be evenly transmitted to each negative pressure hole 211. The tee connector 214 is used to distribute the negative pressure generated by the negative pressure pump 213 to one or more negative pressure boxes 212. The negative pressure pump 213 is the power source for generating negative pressure, usually installed inside or on top of the pick-up base 21, and connected to the tee connector 214 through a pipe. When the negative pressure pump 213 is working, it draws air from the negative pressure box 212 and the negative pressure holes 211, thereby forming negative pressure on the surface of the negative pressure holes 211, firmly adsorbing the molded corneal contact lens substrate onto the surface of the molding boss 23 of the pick-up base 21.

[0050] As one embodiment of this utility model, the mold 11 is provided with two sets of material grooves 12, the forming seat 2 and the material taking seat 21 are provided with two sets of forming bosses 23 and two sets of traction rods 22, and the pipes connecting the three-way connector 214 to the two sets of negative pressure boxes 212 are provided with pressure relief valves for pressure relief to assist in the removal of corneal contact lenses.

[0051] In practice, the arrangement of the two sets of material troughs 12, two sets of forming bosses 23, and two sets of traction rods 22 means that the mold can process two portions of corneal contact lens material simultaneously, and the forming seat and the material receiving seat can also simultaneously perform forming and receiving operations on two portions of material. This parallel processing capability significantly increases the output per operation. The pressure relief valve is located on the pipeline connecting the tee connector 214 and the two sets of negative pressure boxes 212. The pressure relief valve is used to quickly release the negative pressure inside the negative pressure box 212 when needed. After the negative pressure has adhered to the formed corneal contact lens substrate, if it is necessary to assist in the substrate's detachment from the mold or release from the material receiving seat, the pressure relief valve can be opened to quickly eliminate the negative pressure, reduce the adhesion force, and thus assist in the detachment of the substrate.

[0052] As one embodiment of this utility model, the bracket 14 includes at least two vertical rods.

[0053] Working principle of this utility model:

[0054] When using the corneal contact lens substrate molding mold of this invention for production, a fixed amount of corneal contact lens material is first added to the mold 11 at the top of the base 1, distributed in the material grooves 12 on both sides of the mold 11. Next, an external motor drives the motor shaft 33 and the positioning mechanism to move the molding seat 2 directly above the mold 11. During the descent of the molding seat 2, the traction rod 22 at its bottom inserts into the traction hole 13 on the mold 11, achieving precise alignment. The positioning mechanism also provides vertical limiting, ensuring that the molding seat 2 moves vertically. Then, the pressing mechanism (e.g., an electric push rod 16) on the top seat 15 is driven to press the molding seat 2 downwards. Combined with the sliding between the traction rod 22 and the traction hole 13, the molding seat 2 and the mold 11 are limited, ensuring that the molding boss 23 on the molding seat 2 aligns with the material grooves 12 on both sides of the mold 11. After the molding boss 23 on the molding seat 2 presses the corneal contact lens material in the material grooves 12, the corneal contact lens material can be shaped. During this process, the transparent glass 24 installed through the middle of the molding base 2, and the mounting bracket 25 and heating lamp 26 installed on the other side of the transparent glass 24, can accelerate the molding of the corneal contact lens material in the material tank 12. After the corneal contact lens material in the material tank 12 has been molded, the clamping mechanism is released, and the molding base 2 returns to its original position. Subsequently, the external motor drives the positioning mechanism to move the material take-up base 21 directly above the mold 11. Similarly, during the descent of the material take-up base 21, its bottom traction rod 22 will insert into the traction hole 13 on the mold 11 to achieve precise alignment, and the positioning mechanism provides vertical limit. The driving clamping mechanism presses the material take-up base 21 downward, so that its bottom negative pressure hole 211 contacts the molded substrate. At this time, the negative pressure pump 213, installed on the material-receiving seat 21, delivers negative pressure to the inside of the negative pressure box 212 through the three-way connector 214, so that the multiple sets of negative pressure holes 211 connected to the negative pressure box 212 all form a strong negative pressure, thereby efficiently and conveniently adsorbing and removing the corneal contact lens substrate after molding in the material tank 12. Throughout this process, the frame composed of the base 1, the bracket 14, and the top seat 15 provides stable support; the mold 11 provides the molding cavity and positioning reference; the molding seat 2 is responsible for the extrusion molding and heating of the raw material; the material-receiving seat 21 is responsible for picking up the molded substrate; the positioning mechanism is responsible for the horizontal switching and vertical limiting of the molding seat and the material-receiving seat; the pressing mechanism provides the pressure required for molding and material removal; and the heating mechanism accelerates the curing of the raw material. All components work together to achieve efficient and precise molding and non-destructive demolding of the corneal contact lens substrate.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection claimed by this utility model, which is defined by the appended claims and their equivalents.

Claims

1. A corneal contact lens substrate molding mold, comprising a base (1), wherein a top seat (15) is fixedly connected to the top of the base (1) via a bracket (14), characterized in that, Also includes: A mold (11) is set on the top of the base (1). The mold (11) has a material trough (12) for accommodating corneal contact lens material and a traction hole (13) for positioning. The molding seat (2) and the material taking seat (21) are both located above the mold (11). The bottom of the molding seat (2) and the material taking seat (21) are provided with molding bosses (23) and traction rods (22) for cooperating with the traction hole (13) to achieve positioning. The surface of the molding boss (23) located at the bottom of the material taking seat (21) is provided with negative pressure holes (211) for sucking up the molded substrate by negative pressure. The positioning mechanism is connected to the molding seat (2) and the material taking seat (21), and is connected to the motor shaft (33) of the external motor. It is used to selectively move the molding seat (2) or the material taking seat (21) directly above the mold (11) and limit it in the vertical direction. A clamping mechanism is provided on the top seat (15) for applying a downward clamping force to the forming seat (2) or the material taking seat (21) located above the mold (11); A heating mechanism is provided on the forming seat (2) for heating the raw material in the material tank (12).

2. The corneal contact lens substrate molding die according to claim 1, characterized in that, The positioning mechanism includes a connecting frame (3), which is connected to the forming seat (2) and the material taking seat (21). The connecting frame (3) is connected to the motor shaft (33) to drive the forming seat (2) and the material taking seat (21) to rotate horizontally.

3. The corneal contact lens substrate molding die according to claim 2, characterized in that, The connecting frame (3) is provided with a limiting groove (31) for vertical positioning. A limiting rod (32) is slidably arranged in the limiting groove (31). The limiting rod (32) is fixedly connected to the end of the motor shaft (33).

4. The corneal contact lens substrate molding die according to claim 3, characterized in that, Both the limiting groove (31) and the limiting rod (32) are rectangular.

5. A corneal contact lens substrate molding die according to claim 3, characterized in that, A spring (34) is also installed between the connecting frame (3) and the motor shaft (33). The spring (34) is sleeved on the surface of the limiting rod (32). The spring (34) is used to provide an upward restoring force to the connecting frame (3) and the forming seat (2) or the material taking seat (21) connected thereto after the clamping mechanism is released.

6. The corneal contact lens substrate molding die according to claim 1, characterized in that, The heating mechanism includes a light-transmitting glass (24), a mounting bracket (25), and a heating lamp (26). The light-transmitting glass (24) is located in the middle of the molding base (2), the mounting bracket (25) is located on the top of the molding base (2) on one side of the light-transmitting glass (24), and the heating lamp (26) is mounted on the mounting bracket (25).

7. The corneal contact lens substrate molding die according to claim 1, characterized in that, The negative pressure hole (211) on the material taking seat (21) is connected to the negative pressure box (212) by means of the forming boss (23), and the negative pressure box (212) is connected to the negative pressure pump (213) installed on the material taking seat (21) through the three-way connector (214).

8. A corneal contact lens substrate molding die according to claim 7, characterized in that, The mold (11) is provided with two sets of material troughs (12). The forming seat (2) and the material taking seat (21) are provided with two sets of forming bosses (23) and two sets of traction rods (22). The three-way connector (214) is provided with pressure relief valves on the pipelines connecting the two sets of negative pressure boxes (212) for pressure relief to assist in the removal of the corneal contact lens.

9. A corneal contact lens substrate molding die according to claim 1, characterized in that, The support (14) includes at least two vertical rods.

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