A method and system for molding contact lenses

Abstract

The present application relates to the technical field of contact lens automation production, in particular to a contact lens color mold liquid injection and mold combining method and system, comprising a feeding and discharging work station, a mold opening treatment work station, a position changing and calibration unit, a visual pad printing unit, a mold plate set unit, a chromatic aberration detection unit, a curing unit, a liquid injection and mold combining work station, a mold combining detection unit and a conveying unit; first, the mold is sent to the mold opening work station by the conveying unit to separate the mold and process the female mold, and the male mold is temporarily stored; then the female mold is transferred to the pad printing work station through the position changing and calibration unit, and the pattern pad printing is completed by cooperating with the visual pad printing unit and the mold plate set unit; then the chromatic aberration detection and pattern curing are sequentially performed, and the mold is combined in the liquid injection and mold combining work station; after the mold combining quality detection, the mold returns to the feeding and discharging work station, and the cycle operation is realized; the present application solves the problems of traditional equipment layout, low integration, reduces the equipment cost and turnover link, simplifies the process, and guarantees the product precision through double quality detection, and takes into account the practicality and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of automated contact lens production technology, specifically to a method and system for liquid injection and mold assembly of colored contact lens molds. Background Technology

[0002] In the production of colored contact lenses, the conventional method of printing lens patterns involves printing the pattern into a mold, then molding the liquid material into the mold to achieve the printing effect. This method is relatively complex and cannot quickly produce colored contact lenses in large quantities. In the manufacturing process of colored contact lenses, there are usually several methods for printing patterns, among which mold (concave or convex mold) transfer printing is a commonly used method.

[0003] Currently, the main purpose of conventional pad printing equipment and liquid injection molding equipment is to achieve mass production of color molds. The design focus of the equipment is to improve efficiency. There is still considerable room for improvement in the layout and compactness of the equipment. Moreover, conventional pad printing and liquid injection molding operations also use different equipment, which are then used in conjunction with related conveyor lines or material handling trolleys for turnover. For production scenarios that do not require large production capacity, such as small-batch production, R&D technology verification, pattern design prototyping, and process optimization, conventional large-scale equipment is costly, has a complex overall layout, and low functional integration. Therefore, there is an urgent need to provide a solution to address these issues. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for liquid injection and molding of colored contact lenses. The overall equipment layout is compact, and through the coordinated scheduling of various functional units, it fully covers the entire process while maintaining a compact process flow. It is especially suitable for new product development, process verification and small-batch customized production scenarios of colored contact lenses. It achieves a flexible match between equipment investment costs and production capacity requirements while ensuring the accuracy of pad printing.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A method for liquid injection and mold closing of contact lens color molds includes a loading and unloading station, a mold opening processing station, a position calibration unit, a visual transfer printing unit, a template assembly unit, a color difference detection unit, a curing unit, a liquid injection and mold closing station, a mold closing detection unit, and a handling unit. The position calibration unit is equipped with loading and unloading stations and a transfer printing station. The template assembly unit is equipped with a pattern transfer printing station. The liquid injection and mold closing station is equipped with a mold closing temporary storage platform. The specific steps are as follows: S10. The mold handling unit moves the mold to be printed from the loading and unloading station to the mold opening processing station. The mold opening processing station separates the male mold and the female mold and performs surface treatment on the female mold. The mold handling unit moves the male mold to the mold closing temporary storage station. S20. The mold handling unit transports the surface-treated master mold to the loading and unloading station of the transposition calibration unit; S30. The positioning and calibration unit moves the surface-treated master mold from the loading and unloading station to the pad printing station; the template assembly unit moves the pattern template to the pattern transfer station as needed. S40. After the visual pad printing unit calibrates the calibration parameters at the transposition calibration unit as needed, it picks up the pattern of the pattern template at the pattern transfer station and transfers it onto the surface-treated master mold at the pad printing station to obtain the pad printing master mold. S50. The shift calibration unit moves the pad printing master mold to the loading and unloading station, and the mold handling unit moves the pad printing master mold from the shift calibration unit to the color difference detection unit for color difference detection. S60. The mold handling unit transports the master mold, after being inspected by the color difference detection unit, to the curing unit for pattern curing; S70. The mold handling unit transports the cured master mold to the liquid injection and mold closing station for liquid injection and mold closing; S80. The mold handling unit transports the mold after mold closing to the mold closing inspection unit for mold quality inspection; S90. The mold handling unit will transport the mold after quality inspection to the loading and unloading station, and then transport the new mold to be separated to the mold opening processing station for the next work cycle. In continuous pad printing, the mold handling unit replaces the mold after pad printing with the mold to be pad printed at the loading and unloading station of the transfer calibration unit; in steps S10 and S70, the mold handling unit participates in the mold handling operation.

[0006] Furthermore, the mold opening processing station includes a mold opening unit and a surface treatment unit; the mold opening unit includes a mold opening base, a mold opening drive device, and a mold opening gripper driven by the execution end of the mold opening drive device; a mold adsorption component is also provided at the mold opening base; the surface treatment unit includes a surface treatment base, a surface treatment drive device, and a corona discharge assembly. The S10 process also includes the following steps: S11. The mold handling unit places the mold to be transferred at the mold opening base, and the mold adsorption component adsorbs and fixes the mold. S12. The mold opening drive device drives the mold opening gripper to separate the male mold from the female mold; S13. The mold handling unit transports the master mold to the surface treatment seat, and the surface treatment drive device drives the corona component to perform corona treatment on the surface of the master mold. S14. During corona treatment, the mold handling unit will transport the separated male mold to the mold closing temporary storage table for temporary storage.

[0007] Furthermore, the visual pad printing unit includes a pad printing visual component, a pattern visual component, a pad driving device, and a pad printing pad connected to the execution end of the pad driving device; the pad printing pad has a built-in pressure sensor. During calibration, the printing head drive device drives the printing head to the transfer calibration unit to calibrate the preset parameters; during operation, the printing head drive device drives the printing head back and forth between the pattern transfer station and the printing station.

[0008] Furthermore, the pad printing vision component is located at the pad printing station of the transposition calibration unit, and the pattern vision component is located at the pattern transfer station of the template assembly unit.

[0009] Furthermore, the transposition calibration unit includes a transposition driving device, a transposition disk that is driven and connected to the execution end of the transposition driving device, a calibration frame plate mounted on the transposition disk, and at least two mold seats. In S30, the shifting drive device drives the shifting disk, which in turn drives multiple mold holders to cyclically shift positions between the loading / unloading station and the pad printing station; when the pad printing operation requires calibration, the vision pad printing unit calibrates the pad printing parameters at the calibration frame.

[0010] Furthermore, the end face of the calibration plate 340 is horizontal, and the end face of the calibration plate 340 is at the same height as the transfer mold placed on the mold base 330.

[0011] Furthermore, the template assembly unit also includes an assembly drive device, an assembly plate for mounting pattern templates, and an ink cartridge drive device mounted on the assembly plate; the actuator of the ink cartridge drive device is connected to a pad printing ink cartridge; the ink cartridge drive device is mounted on the pattern template using an assembly frame. The kit plate is slidably mounted on the kit carriage, and the kit drive device drives the kit plate to slide on the kit carriage so that the corresponding pattern template moves to the pattern transfer station.

[0012] Furthermore, the actuating end of the ink cartridge drive device is provided with an ink cartridge holder, and the pad printing ink cartridge is slidably mounted on the ink cartridge holder using a guide member. A buffer spring is wound around the guide member, with one end of the buffer spring connected to the pad printing ink cartridge and the other end abutting against the ink cartridge holder.

[0013] Furthermore, S30 also includes the following steps: S31. The ink cartridge drive device drives the ink cartridge holder to move, thereby causing the pad printing ink cartridge to slide into contact with the pattern template so that the ink is coated on the pattern template; S32. The kit drive device drives the kit plate to slide on the kit carriage so that the pattern template can be moved to the pattern transfer station as needed, waiting for the visual transfer unit to pick up the color pattern.

[0014] Furthermore, the template assembly unit 500 also includes a glue head cleaning mechanism 570, which allows the visual pad printing unit 400 to clean the pattern ink as needed during the pad printing process.

[0015] Furthermore, the color difference detection unit includes a color difference detection stage, a color difference visual inspection camera, and a color difference driving device for moving the color difference detection stage; S50 also includes the following steps: S51. The color difference driving device drives the color difference detection table to the receiving position, and the mold handling unit places the master mold after pad printing at the color difference detection table; S52. The color difference detection stage moves the pad printing master mold to the detection field of view of the color difference inspection camera, and the color difference inspection camera acquires multi-directional images of the pattern on the surface of the pad printing master mold. S53. The color difference detection unit compares and analyzes the acquired image with the preset standard pattern, calculates the color deviation value, pattern integrity and positional accuracy parameters, and determines whether the master mold after pad printing is qualified.

[0016] Furthermore, the curing unit includes a curing seat, a curing drive for driving the curing seat, and a curing lamp assembly box; step S60 also includes the following steps: S61. The mold handling unit transports the master mold that has passed the color difference test to the curing seat, and the curing seat positions and fixes the master mold. S62. The curing drive device drives the curing seat to move into the curing lamp box, and the curing lamp box cures the pad printing pattern on the surface of the master mold according to the preset power and duration. S63. During the curing process, the curing drive device drives the curing seat to move the master mold according to the set parameters, ensuring that each area of ​​the pattern is evenly exposed to light and eliminating curing dead corners; S64. After curing is completed, the curing drive device drives the curing seat to exit the curing lamp box, and the mold handling unit transports the cured master mold to the liquid injection and mold closing station.

[0017] Furthermore, the injection molding station also includes an injection mechanism, a pressing mechanism, and a mold moving mechanism; step S70 further includes the following steps: S71. The mold handling unit transports the cured master mold to the mold moving mechanism. The mold moving mechanism moves the cured master mold to the liquid injection mechanism. The liquid injection mechanism injects the filling liquid into the mold cavity of the master mold according to the preset metering. S72. After the injection is completed, the mold moving mechanism moves the injection-filled female mold to the location; the mold transport unit transports the male mold from the mold closing temporary storage table to above the injection-filled female mold; the pressing mechanism presses down the male mold to close with the female mold; S73. After the pressure holding is completed, the pressing mechanism is reset, and the mold moving mechanism transfers the mold after mold closing to the discharge position, waiting for the mold handling unit to move it to the mold closing detection unit for subsequent detection.

[0018] Furthermore, the injection mechanism includes an injection pump assembly, an injection drive, and a plurality of injection needle assemblies mounted on the injection drive actuator. The needle tip distribution of the injection needle assembly matches the injection of the master mold; in S71, the injection drive drives the injection needle assembly to descend to a preset distance above the master mold at the mold moving mechanism, and the injection pump assembly injects the filling liquid into the mold cavity through the injection needle assembly according to the preset flow rate and pressure.

[0019] Furthermore, the pressing mechanism includes a pressing drive device and a pressing counterweight connected to the execution end of the pressing drive device. The pressing counterweight is provided with multiple pressing heads adapted to the top surface of the male mold; a female mold support is also provided below the pressing counterweight; in step S72, The pressing drive device drives the pressing counterweight to move downwards, and the pressing head contacts the top surface of the male mold and applies uniform pressure, so that the male mold and the female mold after liquid injection are pressed tightly together; the female mold support component supports and limits the bottom of the female mold during the pressing process.

[0020] Furthermore, the mold moving mechanism includes a mold moving drive device and a mold support plate that is driven and connected to the execution end of the mold moving drive device; the mold support is provided with a positioning hole that matches the bottom surface of the mother mold; In steps S71 to S73, the mold moving drive device drives the mold support plate to move sequentially to the liquid injection mechanism, the mold closing temporary platform and the pressing mechanism; the positioning hole of the mold support plate mates with the positioning pin on the bottom surface of the mother mold.

[0021] Furthermore, the mold closing detection unit includes a detection base, a mold closing detection camera, a detection drive device, and a detection rotation device mounted on the execution end of the detection drive device; the execution end of the detection rotation device is provided with a mold adsorption structure; step S80 also includes the following steps: S81. The detection drive device drives the detection rotation device to move to the receiving position, the mold handling unit places the mold after mold closing at the detection base, and the detection drive device drives the detection rotation device to move to the detection base to perform vacuum adsorption fixation on the mold after mold closing. S82. The detection drive device drives the detection rotary device to move the mold after mold closing to the mold closing detection camera; S83. The detection rotating device drives the mold to rotate around its axis after mold closing so that each mold after mold closing passes through the detection field of view of the mold closing detection camera group in sequence.

[0022] Furthermore, the loading and unloading station includes a loading platform and an unloading platform; the loading platform, mold opening processing station, position calibration unit, template assembly unit, color difference detection unit, curing unit, liquid injection and mold closing station, mold closing detection unit and unloading station are all located within the handling operation range of the mold handling unit; During operation, the mold handling unit drives the handling displacement device to move the mold fixture back and forth between the feeding unit, the position calibration unit, the color difference detection unit, the good product unloading platform, and the defective product unloading platform; the gripper adjustment device drives the mold fixture to move to the predetermined gripping or releasing position.

[0023] This invention also provides a contact lens color mold transfer printing system for implementing the above-mentioned contact lens color mold injection and mold closing method, including a loading and unloading station, a mold opening processing station for surface treatment, a transfer calibration unit for mold repositioning and calibrating transfer printing pressure parameters, a visual transfer printing unit for visual-assisted transfer printing positioning, a template assembly unit for quickly switching pattern templates, a color difference detection unit for detecting color difference, a curing unit for curing patterns, an injection and mold closing station for filling contact lens filling material, a mold closing detection unit for detecting the quality of the mold after mold closing, and a handling unit for handling the mold.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: This contact lens color mold injection and molding method and system modularly integrates key processes such as mold opening, visual transfer printing, color difference detection, pattern curing, injection molding, and molding inspection, forming a highly compact process flow layout. This achieves full-process integration of color mold production, solving the problems of complex layout and low functional integration of conventional equipment. Through precise unit operations such as position calibration and visual transfer printing, it is suitable for low-capacity scenarios such as small-batch production and R&D prototyping, avoiding the high cost of conventional large equipment. It eliminates the need for multiple equipment turnovers, simplifies the process, and improves operational convenience. At the same time, color difference and molding inspection ensure product quality, balancing accuracy and practicality.

[0025] Through the coordinated scheduling of various functional units, while maintaining a compact process flow, it fully covers the entire process flow from mold loading, visual positioning and pad printing, curing, liquid injection and mold closing, online detection and unloading. It is especially suitable for new product development, process verification and small-batch customized production scenarios of colored contact lenses, and achieves flexible matching between equipment investment costs and capacity requirements while ensuring pad printing accuracy. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall planar structure of the present invention.

[0027] Figure 2 This is a three-dimensional structural diagram of the overall structure of the present invention.

[0028] Figure 3 This is a three-dimensional structural diagram of the mold-making processing station of the present invention.

[0029] Figure 4 This is a three-dimensional structural diagram of the transposition calibration unit and the visual transfer printing unit of the present invention.

[0030] Figure 5 This is a three-dimensional structural diagram of the template assembly unit of the present invention.

[0031] Figure 6 This is a schematic diagram of the planar structure of the template sleeve unit of the present invention.

[0032] Figure 7 This is a three-dimensional structural diagram of the color difference detection unit and curing unit of the present invention.

[0033] Figure 8 This is a three-dimensional structural diagram of the liquid injection and molding station of the present invention.

[0034] Figure 9 This is a schematic diagram of the planar structure of the liquid injection and molding station of the present invention. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] refer to Figure 1-9 As shown, a method for liquid injection and mold closing of contact lens color molds includes a loading and unloading station 100, a mold opening processing station 200, a position calibration unit 300, a visual transfer printing unit 400, a template assembly unit 500, a color difference detection unit 600, a curing unit 700, a liquid injection and mold closing station 900, a mold closing detection unit 800, and a handling unit 1000; the position calibration unit 300 is equipped with a loading and unloading station 301 and a transfer printing station 302; the template assembly unit 500 is equipped with a pattern transfer printing station 501; and the liquid injection and mold closing station 900 is equipped with a mold closing temporary storage platform 940. The specific steps are as follows: S10. The mold handling unit 1000 transports the mold to be transferred from the loading / unloading station 100 to the mold opening processing station 200. The mold opening processing station 200 separates the male mold from the female mold and performs surface treatment on the female mold. The mold handling unit 1000 then transports the male mold to the mold closing temporary storage table 940. S20. The mold handling unit 1000 transports the surface-treated female mold to the loading / unloading station 301 of the transfer calibration unit 300. S30. The transposition calibration unit 300 moves the surface-treated master mold from the loading / unloading station 301 to the pad printing station 302; the template assembly unit 500 moves the pattern template 540 to the pattern transfer station 501 as needed; S40. After calibrating the calibration parameters at the transposition calibration unit 300, the visual pad printing unit 400 picks up the pattern from the pattern template 540 at the pattern transfer station 501 and transfers it to the surface-treated master mold at the pad printing station 302. On the master mold, the pad-printed master mold is obtained; S50. The position calibration unit 300 moves the pad-printed master mold to the loading / unloading station 301, and the mold handling unit 1000 handles the pad-printed master mold from the position calibration unit 300 to the color difference detection unit 600 for color difference detection; S60. The mold handling unit 1000 handles the master mold after detection at the color difference detection unit 600 to the curing unit 700 for pattern curing; S70. The mold handling unit 1000 handles the cured master mold to the liquid injection and mold closing station 900 for liquid injection and mold closing; S80. The mold handling unit 1000 handles the mold after mold closing to the mold closing detection unit 800 for mold quality inspection; S90. The mold handling unit 1000 handles the mold after quality inspection to the loading / unloading station 100, and at the loading / unloading station 100, the new mold to be separated is handled to the mold opening processing station 200 for the next work cycle; In continuous pad printing, the mold handling unit 1000 replaces the pad-printed mold with the mold to be pad-printed at the loading / unloading station 301 of the transfer calibration unit 300; in steps S10 and S70, the mold handling unit 1000 participates in the mold handling operation.

[0037] Specifically, the mold handling unit 1000 can use a high-precision servo-driven multi-axis robotic arm with multi-end suction cups to achieve precise transfer and positioning of molds between workstations; the robotic arm has multi-degree-of-freedom motion capability and can complete complex handling trajectory planning within a compact equipment space.

[0038] This contact lens color mold injection and molding method modularly integrates key processes such as mold opening, visual transfer printing, color difference detection, pattern curing, injection molding, and molding inspection, forming a highly compact process flow layout. This achieves full-process integration of color mold production, solving the problems of complex layout and low functional integration of conventional equipment. Through precise unit operations such as position calibration and visual transfer printing, it is suitable for low-capacity scenarios such as small-batch production and R&D prototyping, avoiding the high cost of conventional large equipment. It eliminates the need for multiple equipment turnovers, simplifies the process, and improves operational convenience. At the same time, color difference and molding inspection ensure product quality, balancing accuracy and practicality.

[0039] This method, through the coordinated scheduling of various functional units, fully covers the entire process flow from mold loading, visual positioning and pad printing, curing, liquid injection and mold closing, online detection and unloading while maintaining a compact process flow. It is especially suitable for new product development, process verification and small-batch customized production scenarios of colored contact lenses. It achieves a flexible match between equipment investment costs and production capacity requirements while ensuring pad printing accuracy.

[0040] In this embodiment, the mold opening processing station 200 includes a mold opening unit 210 and a surface treatment unit 220; the mold opening unit 210 includes a mold opening base 211, a mold opening drive device 212, and a mold opening gripper 214 driven by the execution end of the mold opening drive device 212; a mold adsorption component 213 is also provided at the mold opening base 211; the surface treatment unit 220 includes a surface treatment base 221, a surface treatment drive device 222, and a corona discharge assembly 223; S10 further includes the following steps: S11. The mold handling unit 1000 places the mold to be transferred at the mold opening seat 211, and the mold adsorption component 213 adsorbs and fixes the mold; S12. The mold opening drive device 212 drives the mold opening gripper 214 to separate the male mold from the female mold; S13. The mold handling unit 1000 transports the female mold to the surface treatment seat 221, and the surface treatment drive device 222 drives the corona component 223 to perform corona treatment on the surface of the female mold; S14. During the corona treatment, the mold handling unit 1000 transports the separated male mold to the mold closing temporary storage table 940 for temporary storage.

[0041] Specifically, the corona treatment employs a high-frequency, high-voltage discharge method to form a micro-rough structure on the surface of the master mold and introduce polar groups, significantly improving the adhesion of subsequent pad printing inks. The discharge power and processing time of the corona component 223 can be parameterized according to the material characteristics of the master mold, ensuring the consistency and repeatability of the treatment effect. Through the integrated design of the mold opening unit 210 and the surface treatment unit 220, continuous operation of mold separation and master mold surface treatment is achieved, avoiding the mold transfer waiting time caused by traditional separate equipment. The mold opening drive device 212, in conjunction with the precise clamping of the mold opening claw 214, ensures uniform force during the separation of the male and female molds, preventing damage to the mold cavity. The mold adsorption component 213 provides stable adsorption and fixation before and after mold separation, ensuring the stability and repeatability of the mold opening action. The corona component 223 activates the surface of the master mold, significantly improving the adhesion of subsequent pad printing patterns and reducing defects such as pattern detachment or edge blurring caused by surface tension mismatch. The simultaneous temporary storage of the male mold at the mold closing temporary storage platform 940 enables the timing matching management of mold components, laying the foundation for precise docking of subsequent liquid injection and mold closing processes.

[0042] In this embodiment, the visual pad printing unit 400 includes a pad printing visual component 410, a pattern visual component 420, a pad driving device 430, and a pad printing pad 440 driven and connected to the execution end of the pad driving device 430. The pad printing pad 440 has a built-in pressure sensor. During calibration, the pad driving device 430 drives the pad printing pad 440 to the transfer calibration unit 300 to calibrate preset parameters. During operation, the pad driving device 430 drives the pad printing pad 440 back and forth between the pattern transfer station 501 and the pad printing station 302.

[0043] Specifically, the pad printing head drive device 430 can adopt a multi-axis linkage robotic arm structure, which can realize the precise positioning and attitude adjustment of the pad printing head 440 in three-dimensional space. The pressure sensor built into the pad printing head 440 provides real-time feedback of contact pressure data. When the head contacts the pattern template 540 or the mold to be printed, the pressure sensor transmits the detection signal to the control system, forming a closed-loop pressure control to ensure that the ink amount and transfer pressure of each printing are highly consistent. Both the pad printing vision component 410 and the pattern vision component 420 can adopt a high-resolution industrial camera with a coaxial light source or a ring light source imaging scheme. The pad printing vision component 410 is used to capture the reference feature position of the mold to be printed, and the pattern vision component 420 is used to identify the boundary and center positioning point of the pattern on the pattern template 540. The two work together to achieve precise alignment between the pad printing head 440 and the mold and pattern template 540.

[0044] In this embodiment, the pad printing vision component 410 is located at the pad printing station 302 of the transposition calibration unit 300, and the pattern vision component 420 is located at the pattern transfer station 501 of the template assembly unit 500.

[0045] Specifically, both the pad printing vision component 410 and the pattern vision component 420 adopt an adjustable cantilever mounting structure, which can adjust the camera height and pitch angle according to the field of view requirements of different mold sizes. The optical axis of the pad printing vision component 410 is perpendicular to the plane of the pad printing station 302 of the transposition calibration unit 300, ensuring distortion-free imaging. The pattern vision component 420's field of view covers the entire area of ​​the pattern transfer station 501. After the template grouping unit 500 switches to different pattern templates 540, the pattern vision component 420 automatically re-identifies the pattern features of the current template and updates the visual positioning coordinate system without manual recalibration.

[0046] The visual pad printing unit combines built-in pressure sensing feedback with visual positioning compensation to ensure precise and controllable contact pressure between the printing head and the mold, thus solving the problem of pad printing quality fluctuations caused by individual mold differences.

[0047] In this embodiment, the shift calibration unit 300 includes a shift drive device 310, a shift disk 320 driven and connected to the execution end of the shift drive device 310, a calibration frame plate 340 installed on the shift disk 320, and at least two mold seats 330. In S20, the shift drive device 310 drives the shift disk 320, thereby driving multiple mold seats 330 to cyclically shift positions between the loading / unloading station 301 and the pad printing station 302. When calibration is required for the pad printing operation, the visual pad printing unit 400 calibrates the pad printing parameters at the calibration frame plate 340.

[0048] Specifically, the shift drive device 310 adopts a drive scheme of servo motor and high-precision reducer. The shift disk 320 is a disc-shaped or rectangular turntable structure. The mold bases 330 are evenly arranged along the circumference or edge of the shift disk 320. In this embodiment, two mold bases 330 are set, corresponding to the loading / unloading station 301 and the pad printing station 302 respectively. The shift angle between the two stations is 180 degrees or a fixed shift stroke set according to the disk structure. A rotary encoder is set at the bottom of the shift disk 320 to provide real-time feedback on the disk angle position, forming a closed-loop position control with the servo motor. The calibration plate 340 is set independently of the mold base 330 and serves as the reference plane for the pressure calibration of the pad printing head 440 and the zero-point calibration of the vision system.

[0049] In this embodiment, the end face of the calibration plate 340 is horizontal, and the end face of the calibration plate 340 is at the same height as the transfer mold placed on the mold base 330.

[0050] Specifically, the mounting reference surfaces of the calibration plate 340 and the mold base 330 are at the same horizontal height. This design ensures that the Z-axis zero point position calibrated by the pad printing head 440 on the calibration plate 340 coincides with the actual mold printing height, eliminating systematic errors caused by height differences. The surface of the calibration plate 340 can be provided with calibration patterns or cross-shaped engravings for the pad printing vision component 410 to perform pixel coordinate and physical coordinate mapping calibration. It can also serve as a pressure zero-point calibration platform for the pad printing head pressure sensor, ensuring the accuracy of pressure detection.

[0051] In this embodiment, the template kit unit 500 further includes a kit drive device 510, a kit plate 521 for mounting the pattern template 540, and an ink cartridge drive device 560 mounted on the kit plate 521; the execution end of the ink cartridge drive device 560 is driven and connected to a pad printing ink cartridge 550; the ink cartridge drive device 560 is mounted on the pattern template 540 via a kit frame 530; the kit plate 521 is slidably mounted on the kit carriage 520, and the kit drive device 510 drives the kit plate 521 to slide on the kit carriage 520 so that the corresponding pattern template 540 moves to the pattern transfer station 501.

[0052] Specifically, the kit carriage 520 can use a high-precision linear guide as its guiding base. The kit plate 521 cooperates with the linear guide via a slider. The kit drive device 510 is a ball screw mechanism or linear motor driven by a servo motor, driving the kit plate 521 to achieve precise position switching of multiple pattern templates 540. Multiple pattern template 540 mounting positions are arranged in an array along the sliding direction on the kit plate 521, each mounting position corresponding to a pattern. In this embodiment, four to eight pattern templates 540 are set to cover specific trial production, verification, or small-batch production needs as required. The kit frame 530 is a vertical plate structure, with the ink cartridge drive device 560 mounted above the pattern templates 540. The ink cartridge drive device 560 uses multiple sets of cylinders or electric cylinders as actuators for linear and lifting movements. Under the drive of the ink cartridge drive device 560, the bottom of the pad printing ink cartridge 550 forms a controllable pressure contact with the surface of the pattern template 540, completing the quantitative coating of ink.

[0053] In this embodiment, the execution end of the ink cartridge drive device 560 is provided with an ink cartridge holder 561. The pad printing ink cartridge 550 is slidably mounted on the ink cartridge holder 561 using a guide member 551. A buffer spring 552 is wound around the guide member 551. One end of the buffer spring 552 is connected to the pad printing ink cartridge 550 and the other end abuts against the ink cartridge holder 561.

[0054] Specifically, the guide member 551 is a guide post or guide rod structure. The housing of the pad printing ink cartridge 550 is equipped with a linear bearing or sliding sleeve that mates with the guide member 551, allowing the pad printing ink cartridge 550 to float with a limited stroke along the axial direction of the guide member 551. The buffer spring 552 is a compression spring, and its pre-compression amount can be selected and replaced according to the surface characteristics of the pattern template 540 and the viscosity of the ink. When the ink cartridge drive device 560 drives the ink cartridge holder 561 downwards, the pad printing ink cartridge 550 first contacts the pattern template 540. As the ink cartridge holder 561 continues to descend, the buffer spring 552 is compressed, generating gradually increasing elastic pressure. This pressure eventually stabilizes within a set range, ensuring both the uniformity of ink coating and preventing damage to the surface of the pattern template 540 from rigid contact. A limit stop is provided at the end of the guide member 551 to limit the maximum floating stroke of the pad printing ink cartridge 550 and prevent derailment.

[0055] In this embodiment, step S30 further includes the following steps: S31. The ink cartridge driving device 560 drives the ink cartridge holder 561 to move, thereby causing the pad printing ink cartridge 550 to slide into contact with the pattern template 540 so that the ink is coated on the pattern template 540; S32. The sleeve driving device 510 drives the sleeve plate 521 to slide on the sleeve carriage 520 so that the pattern template 540 moves to the pattern transfer station 501 as needed, waiting for the visual pad printing unit 400 to pick up the color mold pattern.

[0056] Specifically, in step S31, the downward movement speed and stroke of the ink cartridge drive device 560 are set by the control system according to the ink characteristic parameters. After coating, the ink cartridge drive device 560 drives the ink cartridge holder 561 to reset and move upward. The pad printing ink cartridge 550 is smoothly separated from the pattern template 540 under the action of the buffer spring 552. In step S32, the kit drive device 510 receives the pattern switching command from the host computer and drives the kit plate 521 to slide until the target pattern template 540 is aligned with the pattern transfer station 501. During the sliding process, the pattern vision component 420 monitors the template position in real time. After it is in place, the servo locking function of the kit drive device 510 keeps the position stable, waiting for the dip action of the vision pad printing unit 400.

[0057] In this embodiment, the template assembly unit 500 also includes a glue head cleaning mechanism 570. During the pad printing process, the visual pad printing unit 400 can clean the pattern ink as needed.

[0058] Specifically, the pad cleaning mechanism 570 is located at the end or side of the sleeve carriage 520, adjacent to the pattern transfer station 501. Its structure includes an adhesive tape unwinding device, a tape drive roller group, and a waste recycling reel. The adhesive tape surface has moderate adhesion, which can remove residual ink or impurities from the surface of the pad printing pad 440. When the continuous pad printing operation reaches the set number of times, or when ink accumulation or blurred patterns appear on the surface of the pad printing pad 440, the pad driving device 430 drives the pad printing pad 440 to move to the pad cleaning mechanism 570. The adhesive tape passes over the surface of the pad printing pad 440 at a constant speed under the drive roller group, completing the pad cleaning. The cleaned tape waste is then rolled into the recycling reel, realizing automated pad maintenance, reducing the frequency of manual intervention, and ensuring the long-term stability of pad printing quality.

[0059] In this embodiment, the color difference detection unit 600 includes a color difference detection stage 620, a color difference visual inspection camera 630, and a color difference driving device 610 for driving the color difference detection stage 620 to move; S50 also includes the following steps: S51. The color difference driving device 610 drives the color difference detection table 620 to move to the receiving position, and the mold handling unit 1000 places the pad printing master mold at the color difference detection table 620. S52. The color difference detection stage 620 moves the pad printing master mold to the detection field of view of the color difference visual inspection camera 630, and the color difference visual inspection camera 630 performs multi-directional image acquisition of the pattern on the surface of the pad printing master mold. S53. Color difference detection unit 600 compares and analyzes the acquired image with the preset standard pattern, calculates the color deviation value, pattern integrity and positional accuracy parameters, and determines whether the master mold after pad printing is qualified. Specifically, the color difference drive device 610 adopts a precision slide module driven by a servo motor, which enables the color difference detection stage 620 to be quickly positioned and moved smoothly in the horizontal direction. Its positioning accuracy reaches ±0.05mm, ensuring the repeatability of the master mold in the inspection field of view after pad printing. The table surface of the color difference detection stage 620 is equipped with a vacuum adsorption hole array, which can flexibly fix master molds of different specifications and avoid image blurring caused by vibration or displacement during the inspection process. The color difference visual inspection camera 630 adopts a high-resolution color industrial camera, combined with a multi-angle ring light source and a coaxial light source combination, which can achieve 360-degree shadowless illumination of the pad printing pattern and eliminate the interference of surface reflection on color acquisition. In step S52, the color difference detection stage 620 can drive the master mold to perform a compound motion of rotation and translation, enabling the color difference visual inspection camera 630 to acquire multi-dimensional image information of the pattern and comprehensively evaluate the color saturation, hue deviation, edge sharpness and geometric position accuracy of the pattern.

[0060] In this embodiment, the curing unit 700 includes a curing base 720, a curing drive for driving the curing base 720, and a curing lamp assembly box 730; step S60 further includes the following steps: S61. The mold handling unit 1000 transports the master mold that has passed the color difference inspection to the curing seat 720, and the curing seat 720 positions and fixes the master mold; S62. The curing drive device 710 drives the curing seat 720 to move into the curing lamp box 730, and the curing lamp box 730 cures the pad printing pattern on the surface of the master mold according to the preset power and duration; S63. During the curing process, the curing drive device 710 drives the curing seat 720 to move the master mold according to the set, ensuring that each area of ​​the pattern is evenly illuminated and eliminating curing dead corners; S64. After curing is completed, the curing drive device 710 drives the curing seat 720 to exit the curing lamp box 730, and the mold handling unit 1000 transports the cured master mold to the liquid injection and mold closing station 900.

[0061] Specifically, the curing holder 720 is made of high-temperature resistant engineering plastic or aluminum alloy. Its platform is equipped with a contour positioning groove that matches the shape of the master mold, enabling rapid positioning and reliable fixation of the master mold and preventing displacement during the curing process. The curing drive device 710 is a precision linear module driven by a servo motor, which carries the curing holder 720 to reciprocate between the entrance of the curing lamp box 730 and the internal curing station. The moving speed can be set in segments according to the curing process requirements to ensure that the master mold smoothly enters and exits the curing area. The curing lamp box 730 is a box structure with multiple UV-LED curing lamp arrays. The movement trajectory of the curing holder 720 inside the curing lamp box 730 can be reciprocating linear motion, rotational motion, or a combination of both.

[0062] In this embodiment, the liquid injection and mold closing station 900 further includes a liquid injection mechanism 910, a pressing mechanism 920, and a mold moving mechanism 930; step S70 further includes the following steps: S71. The mold handling unit 1000 transports the cured master mold to the mold moving mechanism 930. The mold moving mechanism 930 moves the cured master mold to the liquid injection mechanism 910. The liquid injection mechanism 910 injects the filling liquid into the mold cavity of the master mold according to the preset metering. S72. After the injection is completed, the mold moving mechanism 930 moves the injection-filled female mold to the location; the mold transport unit 1000 transports the male mold at the mold closing temporary storage table 940 to the top of the injection-filled female mold; the pressing mechanism 920 presses down the male mold to close with the female mold; S73. After the pressure holding is completed, the pressing mechanism 920 is reset, and the mold moving mechanism 930 transfers the mold after mold closing to the discharge position, waiting for the mold handling unit 1000 to transport it to the mold closing detection unit 800 for subsequent detection.

[0063] Specifically, the precision metering of the injection mechanism 910, the multi-station flow of the mold transfer mechanism 930, and the precise pressing of the pressing mechanism 920 enable automated injection and mold closing operations of the cured master mold. This effectively avoids fluctuations in injection volume and deviations in mold closing position caused by manual operation, significantly improving the yield and consistency of contact lens color mold production. The mold transfer mechanism 930 adopts a linear module structure driven by a servo motor, which enables rapid switching of the cured master mold between workstations. The mold closing temporary storage platform 940 is located to the side of the pressing mechanism 920 and is used to temporarily store the male mold to be used. After receiving the master mold from the curing unit, the injection and mold closing station precisely aligns and closes it with the male mold temporarily stored in the mold closing temporary storage platform. The injection process before mold closing achieves precise filling of lens material through quantitative control.

[0064] In this embodiment, the injection mechanism 910 includes an injection pump group 911, an injection drive 912, and a plurality of injection needle groups 913 installed on the execution end of the injection drive 912; the needle tip distribution of the injection needle group 913 matches the injection of the master mold; in S71, the injection drive 912 drives the injection needle group 913 to descend to a preset distance above the master mold at the mold transfer mechanism 930, and the injection pump group 911 injects the filling liquid into the mold cavity through the injection needle group 913 according to a preset flow rate and pressure.

[0065] Specifically, the injection pump assembly 911 employs a high-precision peristaltic pump and a pressure feedback closed-loop control system to achieve quantitative delivery of the filling liquid, preventing overflow during mold closing due to excessive injection or incomplete lens formation due to insufficient injection. The injection drive 912 is a servo electric cylinder that drives the injection needle assembly 913 precisely downwards to a preset distance above the mold cavity. In S71, the needle tips of the injection needle assembly 913 penetrate deep into the mold cavity but do not contact the inner wall, preventing air bubbles from forming inside the mold cavity due to high-pressure injection, which would affect the lens forming quality. The number and distribution of the needle tips of the injection needle assembly 913 are designed according to the number and layout of the mold cavities, enabling simultaneous injection into multiple cavities and improving operational efficiency.

[0066] In this embodiment, the pressing mechanism 920 includes a pressing drive device 921 and a pressing counterweight 922 driven by the execution end of the pressing drive device 921. The pressing counterweight 922 is provided with a plurality of pressing heads adapted to the top surface of the male mold. A female mold support 923 is also provided below the pressing counterweight 922. In step S72, the pressing drive device 921 drives the pressing counterweight 922 downward, and the pressing heads contact the top surface of the male mold and apply uniform pressure to make the male mold and the female mold after liquid injection tightly pressed together. The female mold support 923 supports and limits the bottom of the female mold during the pressing process.

[0067] The mold moving mechanism 930 includes a mold moving drive device 931 and a mold support plate 932 driven and connected to the execution end of the mold moving drive device 931; the mold support is provided with a positioning hole that mates with the bottom surface of the mother mold; in steps S71 to S73, the mold moving drive device 931 drives the mold support plate 932 to move sequentially to the liquid injection mechanism 910, the mold closing temporary storage platform 940 and the pressing mechanism 920; the positioning hole of the mold support plate 932 mates with the positioning post on the bottom surface of the mother mold.

[0068] Specifically, the pressing drive device 921 of the pressing mechanism 920 adopts a combination of a servo electric cylinder and a pressure sensor, which can achieve precise closed-loop control of pressing force and pressing stroke. The pressing head of the pressing counterweight 922 is made of soft elastic material, and the contact with the top surface of the male mold is flexible, which can effectively disperse the pressing force and prevent the male mold from deforming due to excessive local stress. In S72, the pressing drive device 921 drives the pressing counterweight 922 to slowly descend. After the pressing head contacts the top surface of the male mold, the pressure sensor provides real-time feedback of the pressing force data. The control system adjusts the output of the pressing drive device 921 according to the preset pressing force threshold, so that the male mold presses down with uniform pressure to close with the female mold. At the same time, the female mold support 923 provides upward support from the bottom of the female mold, forming bidirectional positioning to ensure the alignment accuracy of the male and female molds. The holding pressure time after mold closing is preset by the control system according to the rheological characteristics of the filling liquid, usually 3-5 seconds. During the holding pressure process, the pressing force remains constant, so that the filling liquid can be fully spread in the mold cavity and eliminate internal air bubbles. After the pressure holding in S73 is completed, the pressing drive device 921 drives the pressing counterweight 922 to reset and move upward, and the mold moving drive device 931 drives the mold support plate 932 to move to the discharge position, waiting for the mold handling unit 1000 to handle it. The entire liquid injection and mold closing process realizes automated and precise operation, effectively improving the molding quality of contact lens lenses. In this embodiment, the mold closing detection unit 800 includes a detection base 840, a mold closing detection camera 820, a detection drive device 810, and a detection rotation device 830 installed on the execution end of the detection drive device 810; the execution end of the detection rotation device 830 is provided with a mold adsorption structure; step S80 further includes the following steps: S81. The detection drive device 810 drives the detection rotation device 830 to move to the receiving position. The mold handling unit 1000 places the mold after mold closing at the detection base 840. The detection drive device 810 drives the detection rotation device 830 to move to the detection base 840 to perform vacuum adsorption fixation on the mold after mold closing. S82. The detection drive device 810 drives the detection rotation device 830 to move the mold after mold closing to the mold closing detection camera 820. S83. The detection rotation device 830 drives the mold after mold closing to rotate around its axis so that each mold after mold closing passes through the detection field of view of the mold closing detection camera group 820 in sequence.

[0069] Specifically, the detection base 840 of the mold closing detection unit 800 ensures the stability of the detection process. The detection drive device 810 is a multi-axis servo drive mechanism, which can realize the precise movement of the detection rotation device 830 in the X, Y, and Z axes, and can drive the mold after mold closing to the detection position of the mold closing detection camera 820. The mold adsorption structure at the execution end of the detection rotation device 830 is a vacuum suction cup, which can realize the flexible adsorption and fixation of the mold after mold closing. The mold closing detection camera 820 can be a high-resolution line scan camera, and the field of view of the lens covers the mold closing surface of a single mold. In S83, the detection rotation device 830 drives the mold to rotate 360° at a constant speed around its axis. During the rotation of the mold, the mold closing detection camera 820 sequentially collects images of the mold closing surfaces of multiple molds adsorbed in a single operation, realizing the detection of multiple indicators such as mold closing gap, mold closing alignment accuracy, filling liquid overflow, and mold appearance integrity.

[0070] In this embodiment, the loading and unloading station 100 includes a loading platform 110 and an unloading platform 120; the loading platform 110, the mold opening processing station 200, the position calibration unit 300, the template assembly unit 500, the color difference detection unit 600, the curing unit 700, the liquid injection and mold closing station 900, the mold closing detection unit 800, and the unloading station 120 are all located within the handling operation range of the mold handling unit 1000.

[0071] Specifically, the loading and unloading station 100 serves as the logistics hub of the entire system. The loading platform 110 is used to store molds awaiting pad printing and liquid filling, while the unloading platform 120 is used to receive finished molds that have passed or failed the mold closing inspection. The mold handling unit 1000 adopts a multi-axis collaborative robot module, whose operating range covers all the above-mentioned units and stations. Through a preset handling path planning algorithm, it realizes the orderly flow of molds between various stations. During the handling process, operators only need to replenish raw material molds at the loading platform 110 and collect finished products at the unloading platform 120, which greatly reduces the intensity of manual labor and the risk of operational errors.

[0072] A contact lens color mold transfer printing system for implementing the above-mentioned contact lens color mold injection and mold closing method includes a loading and unloading station 100, a mold opening processing station 200 for surface treatment, a mold repositioning and calibration unit 300 for mold repositioning and calibrating transfer printing pressure parameters, a visual transfer printing unit 400 for visual-assisted transfer printing positioning, a template assembly unit 500 for quickly switching pattern templates 540, a color difference detection unit 600 for detecting color difference, a curing unit 700 for curing patterns, an injection and mold closing station 900 for filling contact lens filling material, a mold closing detection unit 800 for detecting the quality of the mold after mold closing, and a handling unit 1000 for handling the mold.

[0073] Specifically, this contact lens color mold pad printing system achieves fully automated production from mold loading, surface treatment, pad printing positioning, pattern curing, liquid injection and mold closing to finished product inspection through modular integration and collaborative operation of various functional units. The system uses a mold handling unit as the core logistics hub, organically connecting the loading and unloading station, mold opening processing station, position calibration unit, visual pad printing unit, template assembly unit, color difference detection unit, curing unit, liquid injection and mold closing station, and mold closing inspection unit to form a closed-loop production chain. Through the coordinated scheduling of various functional units, while maintaining a compact process flow, it fully covers the entire process flow from mold loading, visual positioning and pad printing, curing, liquid injection and mold closing, online inspection, and unloading. It is especially suitable for new product development, process verification, and small-batch customized production scenarios for colored contact lenses, achieving a flexible match between equipment investment costs and production capacity requirements while ensuring pad printing accuracy.

[0074] The specific embodiments described herein are merely illustrative examples illustrating the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the scope defined by the spirit of the invention.

Claims

1. A method for injecting and sealing colored contact lens molds, characterized in that, It includes a loading / unloading station (100), a mold opening processing station (200), a position calibration unit (300), a visual pad printing unit (400), a template assembly unit (500), a color difference detection unit (600), a curing unit (700), a liquid injection and mold closing station (900), a mold closing detection unit (800), and a handling unit (1000); the position calibration unit (300) is equipped with a loading / unloading station (301) and a pad printing station (302); the template assembly unit (500) is equipped with a pattern transfer station (501); the liquid injection and mold closing station (900) is equipped with a mold closing temporary storage platform (940); the specific steps are as follows: S10. The mold handling unit (1000) transports the mold to be transferred from the loading and unloading station (100) to the mold opening processing station (200). The mold opening processing station (200) separates the male mold from the female mold and performs surface treatment on the female mold. The mold handling unit (1000) transports the male mold to the mold closing temporary storage table (940). S20. The mold handling unit (1000) transports the surface-treated master mold to the loading / unloading station (301) of the transposition calibration unit (300); S30. The positioning calibration unit (300) moves the surface-treated master mold from the loading and unloading station (301) to the pad printing station (302); the template assembly unit (500) moves the pattern template (540) to the pattern transfer station (501) as needed; S40. The visual transfer printing unit (400) calibrates the calibration parameters at the transposition calibration unit (300) as needed, and then transfers the pattern of the pattern template (540) to the surface-treated master mold at the pattern transfer printing station (302) at the pattern transfer station (501) to obtain the transfer printing master mold. S50. The shift calibration unit (300) moves the pad printing master mold to the loading and unloading station (301), and the mold handling unit (1000) moves the pad printing master mold from the shift calibration unit (300) to the color difference detection unit (600) for color difference detection; S60. The mold handling unit (1000) transports the master mold after the color difference detection unit (600) to the curing unit (700) for pattern curing; S70. The mold handling unit (1000) transports the cured master mold to the liquid injection and mold closing station (900) for liquid injection and mold closing; S80. The mold handling unit (1000) transports the mold after mold closing to the mold closing inspection unit (800) for mold quality inspection; S90. The mold handling unit (1000) transports the mold after quality inspection to the loading and unloading station (100), and at the loading and unloading station (100), it transports the new mold to be separated to the mold opening processing station (200) for the next work cycle. In continuous pad printing, the mold handling unit (1000) replaces the pad-printed mold with the mold to be printed at the loading / unloading station (301) of the transfer calibration unit (300); in steps S10 and S70, the mold handling unit (1000) participates in the mold handling operation.

2. The method for injection and molding of a colored contact lens mold according to claim 1, characterized in that, The mold opening processing station (200) includes a mold opening unit (210) and a surface treatment unit (220); the mold opening unit (210) includes a mold opening base (211), a mold opening drive device (212), and a mold opening gripper (214) driven by the execution end of the mold opening drive device (212); a mold adsorption component (213) is also provided at the mold opening base (211); the surface treatment unit (220) includes a surface treatment base (221), a surface treatment drive device (222), and a corona discharge assembly (223); The S10 process also includes the following steps: S11. The mold handling unit (1000) places the mold to be transferred at the mold opening base (211), and the mold adsorption component (213) adsorbs and fixes the mold; S12. The mold opening drive device (212) drives the mold opening gripper (214) to separate the male mold from the female mold; S13. The mold handling unit (1000) transports the master mold to the surface treatment seat (221), and the surface treatment drive device (222) drives the corona assembly (223) to perform corona treatment on the surface of the master mold. S14. During corona treatment, the mold handling unit (1000) transports the separated male mold to the mold closing temporary storage table (940) for temporary storage.

3. The method for injection and molding of a colored contact lens mold according to claim 1, characterized in that, The visual pad printing unit (400) includes a pad printing visual component (410), a pattern visual component (420), a pad driving device (430), and a pad printing pad (440) that is driven and connected to the execution end of the pad driving device (430); the pad printing pad (440) has a built-in pressure sensor. During calibration, the printing head drive device (430) drives the pad printing head (440) to the transfer calibration unit (300) to calibrate the preset parameters; during operation, the printing head drive device (430) drives the pad printing head (440) to move back and forth between the pattern transfer station (501) and the pad printing station (302). The pad printing vision component (410) is located at the pad printing station (302) of the transposition calibration unit (300), and the pattern vision component (420) is located at the pattern transfer station (501) of the template assembly unit (500).

4. The method for injection and molding of a colored contact lens mold according to claim 1, characterized in that, The transposition calibration unit (300) includes a transposition drive device (310), a transposition disk (320) driven and connected to the execution end of the transposition drive device (310), a calibration frame plate (340) mounted on the transposition disk (320), and at least two mold seats (330). In S30, the shift drive device (310) drives the shift disk (320) to drive multiple mold holders (330) to cyclically shift between the loading / unloading station (301) and the pad printing station (302); when the pad printing operation requires calibration, the vision pad printing unit (400) calibrates the pad printing parameters at the calibration frame (340).

5. The method for injection and molding of a colored contact lens mold according to claim 1, characterized in that, The template kit unit (500) further includes a kit drive device (510), a kit plate (521) for mounting the pattern template (540), and an ink cartridge drive device (560) mounted on the kit plate (521); the execution end of the ink cartridge drive device (560) is connected to a pad printing ink cartridge (550); the ink cartridge drive device (560) is mounted on the pattern template (540) using a kit frame (530); The kit plate (521) is slidably mounted on the kit carriage (520). The kit drive device (510) drives the kit plate (521) to slide on the kit carriage (520) so that the corresponding pattern template (540) moves to the pattern transfer station (501). The execution end of the ink cartridge drive device (560) is provided with an ink cartridge holder (561). The pad printing ink cartridge (550) is slidably mounted on the ink cartridge holder (561) using a guide member (551). A buffer spring (552) is wound around the guide member (551). One end of the buffer spring (552) is connected to the pad printing ink cartridge (550) and the other end abuts against the ink cartridge holder (561). In S30, the following steps are also included: S31. The ink cartridge drive device (560) drives the ink cartridge holder (561) to move, thereby causing the pad printing ink cartridge (550) to slide into contact with the pattern template (540) so that the ink is coated on the pattern template (540). S32. The kit drive device (510) drives the kit plate (521) to slide on the kit carriage (520) so that the pattern template (540) is moved to the pattern transfer station (501) as needed, waiting for the visual transfer unit (400) to pick up the color pattern.

6. The method for injection and molding of a colored contact lens mold according to claim 1, characterized in that, The color difference detection unit (600) includes a color difference detection stage (620), a color difference visual inspection camera (630), and a color difference driving device (610) for moving the color difference detection stage (620); S50 also includes the following steps: S51. The color difference driving device (610) drives the color difference detection stage (620) to move to the receiving position, and the mold handling unit (1000) places the pad-printed master mold at the color difference detection stage (620); S52. The color difference detection stage (620) moves the pad-printed master mold to the detection field of view of the color difference visual inspection camera (630), and the color difference visual inspection camera (630) performs multi-directional image acquisition of the pattern on the surface of the pad-printed master mold; S53. The color difference detection unit (600) compares and analyzes the acquired image with the preset standard pattern, calculates the color deviation value, pattern integrity and position accuracy parameters, and determines whether the pad-printed master mold is qualified; The curing unit (700) includes a curing drive and a curing lamp assembly box (730) connected to the curing base (720) and the driving curing base (720); in step S60, the following steps are also included: S61. The mold handling unit (1000) transports the qualified master mold to the curing seat (720), and the curing seat (720) positions and fixes the master mold; S62. The curing drive device (710) drives the curing seat (720) to move into the curing lamp box (730), and the curing lamp box (730) cures the transfer pattern on the surface of the master mold according to the preset power and time; S63. During the curing process, the curing drive device (710) drives the curing seat (720) to move the master mold according to the set, ensuring that each area of ​​the pattern is evenly illuminated and eliminating curing dead corners; S64. After curing is completed, the curing drive device (710) drives the curing seat (720) to exit the curing lamp box (730), and the mold handling unit (1000) transports the cured master mold to the liquid injection and mold closing station (900).

7. The method for injection and molding of a colored contact lens mold according to claim 1, characterized in that, The injection molding station (900) further includes an injection mechanism (910), a pressing mechanism (920), and a mold moving mechanism (930); step S70 also includes the following steps: S71. The mold handling unit (1000) transports the cured master mold to the mold moving mechanism (930), the mold moving mechanism (930) moves the cured master mold to the liquid injection mechanism (910), and the liquid injection mechanism (910) injects the filling liquid into the mold cavity of the master mold according to the preset metering. S72. After the injection is completed, the mold moving mechanism (930) moves the injection-filled female mold to the location; the mold handling unit (1000) moves the male mold from the mold closing temporary storage table (940) to the top of the injection-filled female mold; the pressing mechanism (920) presses down the male mold to close with the female mold; S73. After the pressure holding is completed, the pressing mechanism (920) is reset, and the mold moving mechanism (930) transfers the mold after mold closing to the discharge position, waiting for the mold handling unit (1000) to transport it to the mold closing detection unit (800) for subsequent detection.

8. The method for injection and molding of a colored contact lens mold according to claim 7, characterized in that, The injection mechanism (910) includes an injection pump assembly (911), an injection drive (912), and a plurality of injection needle assemblies (913) installed on the execution end of the injection drive (912). The needle tip distribution of the injection needle assembly (913) matches the injection of the master mold; in S71, the injection drive (912) drives the injection needle assembly (913) to descend to a preset distance above the master mold at the mold transfer mechanism (930), and the injection pump assembly (911) injects the filling liquid into the mold cavity through the injection needle assembly (913) according to the preset flow rate and pressure; the mold transfer mechanism (930) includes a mold transfer drive device (931) and a mold support plate (932) driven and connected to the execution end of the mold transfer drive device (931); the mold support is provided with a positioning hole that matches the bottom surface of the master mold; In steps S71 to S73, the mold moving drive device (931) drives the mold support plate (932) to move sequentially to the liquid injection mechanism (910), the mold closing temporary storage platform (940), and the pressing mechanism (920); the positioning hole of the mold support plate (932) cooperates with the positioning pin on the bottom surface of the mother mold.

9. The method for injection and molding of a colored contact lens mold according to claim 1, characterized in that, The mold closing detection unit (800) includes a detection base (840), a mold closing detection camera (820), a detection drive device (810), and a detection rotation device (830) installed on the execution end of the detection drive device (810); the execution end of the detection rotation device (830) is provided with a mold adsorption structure; step S80 also includes the following steps: S81. The detection drive device (810) drives the detection rotation device (830) to move to the receiving position, and the mold handling unit (1000) places the mold after mold closing at the detection base (840). The detection drive device (810) drives the detection rotation device (830) to move to the detection base (840) to perform vacuum adsorption fixation on the mold after mold closing. S82. The detection drive device (810) drives the detection rotation device (830) to move the mold after mold closing to the mold closing detection camera (820); S83. The detection rotation device (830) drives the mold after mold closing to rotate around its axis so that each mold after mold closing passes through the detection field of view of the mold closing detection camera group (820) in sequence.

10. A contact lens color mold transfer system, characterized in that, The method for injecting and closing a colored contact lens mold according to any one of claims 1-9 includes a loading and unloading station (100), a mold opening processing station (200) for surface treatment, a shifting and calibration unit (300) for mold repositioning and calibrating pad printing pressure parameters, a visual pad printing unit (400) for visual-assisted pad printing positioning, a template assembly unit (500) for quickly switching pattern templates (540), a color difference detection unit (600) for detecting color difference, a curing unit (700) for curing patterns, an injection and closing mold station (900) for filling contact lens filling material, a mold closing detection unit (800) for detecting the quality of the mold after closing, and a handling unit (1000) for handling the mold.

Images