Automatic mold closing and welding device for contact lens molding mold

Abstract

The present invention discloses an automatic mold closing and welding device for a contact lens molding mold, which is composed of a fixed table panel, a product placement jig, a servo pressing and welding module and a lower mold fixing device. The upper surface of the fixed table panel is provided with a product placement jig, and the lower mold fixing device is provided directly below the product placement jig; the servo pressing and welding module includes a servo pressing and welding module fixing seat, a lifting servo drive mechanism and a pressing and welding mechanism. The servo pressing and welding module fixing seat is arranged on the upper surface of the fixed table panel, and the pressing and welding mechanism is provided directly above the product placement jig, and the pressing and welding mechanism is arranged on the servo pressing and welding module fixing seat through the lifting servo drive mechanism. The present invention integrates the pressing mechanism and the welding mechanism into a set of equipment, so that the mold closing and welding can be carried out simultaneously, and at the same time, a fixed weight counterweight block is used to provide stable pressure to press the upper and lower molds, so as to have a pressure-keeping function, which can effectively improve the stability of the mold closing and the qualified rate of the product.

Description

Technical Field

[0001] The invention belongs to the technical field of automated production and manufacturing of contact lenses, and in particular relates to an automatic mold closing and welding device for a contact lens molding mold. Background Art

[0002] At present, in the manufacturing process of contact lenses, it is necessary to first inject liquid into the contact lens molding mold, then close the upper and lower molds of the molding mold, and then fix the upper and lower molds by welding. Cylinders are usually used to press the upper and lower molds, but the stability of this cylinder pressing method is poor. In addition, the existing welding mechanism is not integrated with the mold closing mechanism, resulting in a relatively low product yield. Summary of the invention

[0003] In view of the defects of the prior art, the present invention provides an automatic mold closing and welding device for a contact lens molding mold to improve the stability of the upper and lower molds when pressing together and improve the product yield.

[0004] In order to solve the above technical problems and achieve the above technical effects, the present invention is implemented through the following technical solutions:

[0005] A contact lens forming mold automatic mold closing and welding device, composed of a fixed table panel, a product placement jig, a servo pressing and welding module and a lower mold fixing device, wherein at least one of the product placement jigs is embedded in the upper surface of the fixed table panel, and a corresponding lower mold fixing device is arranged directly below each of the product placement jigs, and the lower mold fixing device is fixedly connected to the lower surface of the fixed table panel; the servo pressing and welding module comprises a servo pressing and welding module fixing seat, a lifting servo drive mechanism and a pressing and welding mechanism, the servo pressing and welding module fixing seat is fixedly installed on the upper surface of the fixed table panel, and a corresponding pressing and welding mechanism is arranged directly above each of the product placement jigs, and each of the pressing and welding mechanisms is installed on the servo pressing and welding module fixing seat through a corresponding lifting servo drive mechanism, and the pressure head of each of the pressing and welding mechanisms is respectively aligned downward with the corresponding product placement jig.

[0006] Furthermore, the lifting servo drive mechanism is composed of a Z-axis KK linear module, a KK linear module fixing plate and a KK linear module driving motor. The Z-axis KK linear module is fixedly mounted on the front side of the servo pressing and welding module fixing seat through the KK linear module fixing plate. The KK linear module driving motor is arranged at the top of the Z-axis KK linear module and is transmission-connected to the Z-axis KK linear module. The pressing and welding mechanism is mounted on the slider of the Z-axis KK linear module.

[0007] Furthermore, the pressing and welding mechanism includes a pressing and welding mechanism fixing seat, a welding buffer cylinder, a counterweight block connecting rod, a counterweight block slide rail, a counterweight block, a welding plate, a pressing jig and an upper mold suction cup. The welding buffer cylinder is vertically downwardly installed inside the pressing and welding mechanism fixing seat, and the welding buffer cylinder is fixedly connected to the top surface inside the pressing and welding mechanism fixing seat. The lifting rod of the welding buffer cylinder passes downward through the bottom of the pressing and welding mechanism fixing seat and is fixedly connected to the welding plate. A plurality of vertical counterweight block slide rails are arranged between the pressing and welding mechanism fixing seat and the welding plate. The top end of each counterweight block slide rail is fixedly connected to the lower surface of the pressing and welding mechanism fixing seat, and a piece is fixedly installed on the slider of each counterweight block slide rail. The counterweight block; a vertical counterweight connecting rod is fixedly installed on the upper surface of each counterweight block, and the upper part of each counterweight connecting rod is slidably connected to the bottom of the pressing welding mechanism fixing seat up and down; the pressing jig can be slidably passed through the welding plate up and down, the top of the pressing jig is fixedly connected to the lower surface of the counterweight block, and the bottom of the pressing jig is fixedly installed with an upper mold suction nozzle, and all the upper mold suction nozzles constitute the upper mold suction cup, and the air pressure of the welding buffer cylinder is regulated by the pressure regulating valve, and the air pressure of the welding buffer cylinder is regulated by the pressure regulating valve, so that the telescopic rod has the function of slightly retracting when subjected to force and automatically extending and resetting when not subjected to force, so as to provide buffering for the welding needle of the welding plate when the welding needle of the welding plate contacts the upper mold.

[0008] Furthermore, the counterweight slide rail is evenly arranged around the lifting rod of the welding buffer cylinder, the pressing jig is distributed in a ring shape on the welding plate according to the arrangement shape of the counterweight slide rail, and the upper mold suction nozzle is also distributed in a ring shape under the welding plate according to the arrangement shape of the pressing jig, forming the upper mold suction cup.

[0009] Furthermore, the upper part of the counterweight block connecting rod can be slidably inserted up and down on the lower surface of the pressing and welding mechanism fixing seat, and the top of the counterweight block connecting rod is connected to a limit cap for preventing the counterweight block connecting rod from descending excessively after being inserted upward into the interior of the pressing and welding mechanism fixing seat.

[0010] Furthermore, the press-fit welding mechanism fixed seat is formed by a press-fit welding mechanism fixed upper plate, a press-fit welding mechanism fixed lower plate, a press-fit welding mechanism fixed side plate and a press-fit welding mechanism fixed back plate. The internal space of the press-fit welding mechanism fixed seat is used to accommodate the main body of the welding buffer cylinder, the press-fit welding mechanism fixed upper plate is used to fix the main body of the welding buffer cylinder, the press-fit welding mechanism fixed lower plate is used to fix the counterweight block slide rail and the lifting rod slidably connected to the counterweight block connecting rod and the welding buffer cylinder, and the press-fit welding mechanism fixed back plate is used to be connected to the lifting servo drive mechanism.

[0011] Furthermore, the lower mold fixing device includes a lower mold fixing device mounting seat, a lower mold suction cup lifting cylinder and a lower mold suction cup, the upper surface of the lower mold fixing device mounting seat is used to be fixedly connected to the lower surface of the fixed table panel, the lower mold suction cup lifting cylinder is fixedly installed on the front surface of the lower mold fixing device mounting seat, the lower mold suction cup is installed on the top of the lifting rod of the lower mold suction cup lifting cylinder, and the lower mold suction cup is upwardly aligned with the corresponding product placement fixture.

[0012] Furthermore, a vertical smoke collecting dust pipe is fixedly installed on the front surface of the lower mold suction cup lifting cylinder, the top end of the smoke collecting dust pipe is connected to the central through hole on the lower mold suction cup, and the bottom end of the smoke collecting dust pipe is used to connect to the smoke collecting dust device.

[0013] Furthermore, the lower mold suction cup is composed of a lower mold suction cup base and a plurality of lower mold suction nozzles. A central through hole that passes through the upper and lower parts is opened in the center of the lower mold suction cup base. The lower mold suction nozzles are fixedly installed on the upper surface of the lower mold suction cup base and are evenly distributed around the central through hole. A vacuum air path is opened inside the lower mold suction cup base. One end of the vacuum air path is connected to the lower mold suction nozzle, and the other end of the vacuum air path is connected to a vacuum interface arranged on the side of the lower mold suction cup base.

[0014] Furthermore, after welding is completed, the lifting servo drive mechanism drives the welding plate to remain in the lowest position for a certain period of time, and the welding plate is in a power-off state, which maintains the pressure of the upper mold and the lower mold welded together, while allowing the upper mold and the lower mold welded together to cool down, thereby avoiding elastic reset at the welding point due to incomplete cooling, thereby ensuring the stability of welding.

[0015] Furthermore, two of the product placement jigs are embedded on the front side of the upper surface of the fixed table panel, and two of the lower mold fixing devices are provided on the front side of the lower surface of the fixed table panel, and the two product placement jigs correspond to the two lower mold fixing devices one by one up and down respectively; the servo pressing and welding module fixing seat is provided on the rear side of the upper surface of the fixed table panel, and the front surface of the servo pressing and welding module fixing seat is provided with two pressing and welding mechanisms located above the two product placement jigs through two corresponding lifting servo drive mechanisms, and the two pressing and welding mechanisms correspond to the two product placement jigs one by one up and down respectively.

[0016] The beneficial effects of the present invention are:

[0017] 1. The automatic mold closing and welding device for contact lens molding molds provided by the present invention integrates the pressing mechanism and welding mechanism of the upper and lower molds into a set of equipment, so that the mold closing and welding can be carried out simultaneously. At the same time, a fixed weight counterweight block is used to provide stable pressure to press the upper and lower molds. A pressure holding function is added during the pressing and welding process, which can give the welding point a certain cooling time, thereby effectively improving the stability of the mold closing and improving the qualified rate of the product.

[0018] 2. The present invention adds a welding buffer cylinder above the welding plate. The air pressure of the welding buffer cylinder is adjusted by the pressure regulating valve to reach the required value, so that its telescopic rod has the function of slightly retracting when subjected to force and automatically extending and resetting when not subjected to force, so as to provide buffering for the welding pin of the welding plate when it contacts the upper mold to avoid crushing the welding pin. Moreover, compared with the traditional buffering method of spring, the welding buffer cylinder of the present invention adopts air pressure regulation, and the pressure value can remain unchanged, while the spring will produce fatigue damage, the force value will change, and the buffering effect is unstable.

[0019] 3. The present invention adds a lower mold fixing device below the product placement jig, so that when the upper mold is sucked up, the lower mold can be prevented from being lifted up together. At the same time, the present invention adopts a welding method of placing the upper mold and the lower mold together in the product placement jig, and then separating the two for liquid injection and pressing. Compared with the existing welding method of first putting down the mold, then injecting liquid, and then putting the upper mold, the concentricity of the upper and lower molds can be ensured, thereby ensuring the yield of the product.

[0020] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 It is a three-dimensional diagram of the overall structure of the automatic mold closing and welding device for contact lens molding molds of the present invention;

[0023] Figure 2 A three-dimensional diagram of the servo pressing welding module of the present invention;

[0024] Figure 3 A three-dimensional diagram of a pressing welding mechanism of a servo pressing welding module in the present invention;

[0025] Figure 4 It is a three-dimensional diagram of the lower mold fixing device of the present invention.

[0026] Explanation of the numbers in the figure: 1. Fixed table panel; 2. Servo pressing and welding module; 3. Lower mold fixing device; 4. Product placement fixture; 5. Servo pressing module fixing seat; 6. Lifting servo drive mechanism; 7. Pressing and welding mechanism; 8. Pressing and welding mechanism fixing seat; 9. Welding buffer cylinder; 10. Counterweight block connecting rod; 11. Counterweight block slide rail; 12. Counterweight block; 13. Welding plate; 14. Pressing fixture; 15. Upper mold suction cup; 16. Lower mold fixing device mounting seat; 17. Lower mold suction cup lifting cylinder; 18. Smoke dust removal duct; 19. Lower mold suction cup; 20. Z-axis KK linear module; 21. KK linear module fixing plate; 22. KK linear module drive motor; 23. Limiting cap; 24. Lower mold suction cup base; 25. Lower mold suction nozzle; 26. Central through hole. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. The descriptions herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] See also Figure 1-3As shown, an automatic mold closing and welding device for a contact lens molding mold is composed of a fixed table panel 1, a product placement jig 4, a servo pressing and welding module 2 and a lower mold fixing device 3. At least one of the product placement jigs 4 is embedded in the upper surface of the fixed table panel 1, and a corresponding lower mold fixing device 3 is arranged directly below each of the product placement jigs 4, and the lower mold fixing device 3 is fixedly connected to the lower surface of the fixed table panel 1; the servo pressing and welding module 2 includes a servo pressing and welding module fixing seat 5, a lifting servo drive mechanism 6 and a pressing and welding mechanism 7, the servo pressing and welding module fixing seat 5 is fixedly installed on the upper surface of the fixed table panel 1, and a corresponding pressing and welding mechanism 7 is arranged directly above each of the product placement jigs 4, and each of the pressing and welding mechanisms 7 is installed on the servo pressing and welding module fixing seat 5 through a corresponding lifting servo drive mechanism 6, and the pressure heads of each of the pressing and welding mechanisms 7 are respectively aligned downward with the corresponding product placement jigs 4.

[0029] Furthermore, the lifting servo drive mechanism 6 is composed of a Z-axis KK linear module 20, a KK linear module fixing plate 21 and a KK linear module driving motor 22. The Z-axis KK linear module 20 is fixedly mounted on the front side of the servo pressing and welding module fixing seat 5 through the KK linear module fixing plate 21. The KK linear module driving motor 22 is arranged at the top of the Z-axis KK linear module 20 and is transmission-connected to the Z-axis KK linear module 20. The pressing and welding mechanism 7 is mounted on the slider of the Z-axis KK linear module 20.

[0030] For further information, see Figure 3As shown, the pressing and welding mechanism 7 includes a pressing and welding mechanism fixing seat 8, a welding buffer cylinder 9, a counterweight block connecting rod 10, a counterweight block slide rail 11, a counterweight block 12, a welding plate 13, a pressing jig 14 and an upper mold suction cup 15. The welding buffer cylinder 9 is vertically downwardly installed inside the pressing and welding mechanism fixing seat 8, and the welding buffer cylinder 9 is fixedly connected to the top surface inside the pressing and welding mechanism fixing seat 8. The lifting rod of the welding buffer cylinder 9 passes downward through the bottom of the pressing and welding mechanism fixing seat 8 and is fixedly connected to the welding plate 13. A plurality of vertical counterweight block slide rails 11 are arranged between the pressing and welding mechanism fixing seat 8 and the welding plate 13. The top end of each counterweight block slide rail 11 is fixedly connected to the lower surface of the pressing and welding mechanism fixing seat 8, and each of the counterweight block slide rails 11 is fixedly installed with a slider. A counterweight block 12; a vertical counterweight block connecting rod 10 is fixedly installed on the upper surface of each counterweight block 12, and the upper part of each counterweight block connecting rod 10 is slidably connected to the bottom of the pressing welding mechanism fixing seat 8; the pressing fixture 14 is slidably arranged on the welding plate 13, the top of the pressing fixture 14 is fixedly connected to the lower surface of the counterweight block 12, and the bottom of the pressing fixture 14 is fixedly installed with an upper mold suction nozzle, and all the upper mold suction nozzles constitute the upper mold suction cup 15, the air pressure of the welding buffer cylinder 9 is regulated by the pressure regulating valve, and the air pressure of the welding buffer cylinder 9 is regulated by the pressure regulating valve, so that the telescopic rod has the function of slightly retracting when subjected to force, and automatically extending and resetting when not subjected to force, so as to provide buffering for the welding needle of the welding plate 13 when the welding needle of the welding plate 13 contacts the upper mold.

[0031] Furthermore, the counterweight slide rail 11 is evenly arranged around the lifting rod of the welding buffer cylinder 9, and the pressing jig 14 is arranged and distributed in a ring shape on the welding plate 13 according to the arrangement shape of the counterweight slide rail 11, and the upper mold suction nozzle is also arranged and distributed in a ring shape under the welding plate 13 according to the arrangement shape of the pressing jig 14, forming the upper mold suction cup 15.

[0032] Furthermore, the upper portion of the counterweight connecting rod 10 can be slidably inserted up and down on the lower surface of the pressing and welding mechanism fixing seat 8, and the top of the counterweight connecting rod 10 is connected to a limit cap 23 for preventing the counterweight connecting rod 10 from descending excessively after being inserted upward into the interior of the pressing and welding mechanism fixing seat 8.

[0033] Furthermore, the press-welding mechanism fixed seat 8 is formed by a press-welding mechanism fixed upper plate, a press-welding mechanism fixed lower plate, a press-welding mechanism fixed side plate and a press-welding mechanism fixed back plate. The internal space of the press-welding mechanism fixed seat 8 is used to accommodate the main body of the welding buffer cylinder 9. The press-welding mechanism fixed upper plate is used to fix the main body of the welding buffer cylinder 9. The press-welding mechanism fixed lower plate is used to fixedly connect the counterweight block slide rail 11 and the lifting rod slidably connecting the counterweight block connecting rod 10 and the welding buffer cylinder 9. The press-welding mechanism fixed back plate is used to connect to the lifting servo drive mechanism 6.

[0034] For further information, see Figure 4 As shown, the lower mold fixing device 3 includes a lower mold fixing device mounting seat 16, a lower mold suction cup lifting cylinder 17 and a lower mold suction cup 19, the upper surface of the lower mold fixing device mounting seat 16 is used to be fixedly connected to the lower surface of the fixed table panel 1, the lower mold suction cup lifting cylinder 17 is fixedly installed on the front surface of the lower mold fixing device mounting seat 16, the lower mold suction cup 19 is installed on the top of the lifting rod of the lower mold suction cup lifting cylinder 17, and the lower mold suction cup 19 is upwardly aligned with the corresponding product placement fixture 4.

[0035] Furthermore, a vertical smoke collecting dust pipe 18 is fixedly installed on the front surface of the lower mold suction cup lifting cylinder 17, the top end of the smoke collecting dust pipe 18 is connected to the central through hole on the lower mold suction cup 19, and the bottom end of the smoke collecting dust pipe 18 is used to connect to the smoke collecting dust device.

[0036] Furthermore, the lower mold suction cup 19 is composed of a lower mold suction cup base 24 and a plurality of lower mold suction nozzles 25. A central through hole 26 that passes through the upper and lower parts is opened in the center of the lower mold suction cup base 24. The lower mold suction nozzles 25 are fixedly installed on the upper surface of the lower mold suction cup base 24 and are evenly distributed around the central through hole 26. A vacuum air path is opened inside the lower mold suction cup base 24. One end of the vacuum air path is connected to the lower mold suction nozzle 25, and the other end of the vacuum air path is connected to the vacuum interface set on the side of the lower mold suction cup base 24.

[0037] Furthermore, after welding is completed, the lifting servo drive mechanism 6 drives the welding plate 13 to remain in the lowest position for a certain period of time, and the welding plate 13 is in a power-off state, which plays a role in maintaining the pressure of the upper mold and the lower mold welded together, while allowing the upper mold and the lower mold welded together to cool down, thereby avoiding elastic reset at the welding point due to incomplete cooling, thereby ensuring the stability of welding.

[0038] Furthermore, two product placement jigs 4 are embedded on the front side of the upper surface of the fixed table panel 1, and two lower mold fixing devices 3 are provided on the front side of the lower surface of the fixed table panel 1, and the two product placement jigs 4 correspond to the two lower mold fixing devices 3 one by one up and down respectively; the servo pressing and welding module fixing seat 5 is provided on the rear side of the upper surface of the fixed table panel 1, and the front surface of the servo pressing and welding module fixing seat 5 is provided with two pressing and welding mechanisms 7 located above the two product placement jigs 4 through two corresponding lifting servo drive mechanisms 6, and the two pressing and welding mechanisms 7 correspond to the two product placement jigs 4 one by one up and down respectively.

[0039] The working principle and working process of the present invention are as follows:

[0040] During specific work, the robot arm of the previous process automatically places the upper mold and the lower mold for product molding into the product placement jig 4, and first places the combined upper mold and the lower mold into the product placement jig 4 before separating the molds, which can ensure the concentricity of the upper and lower molds, thereby ensuring the yield of the product.

[0041] After the upper and lower molds are in place, the lower mold suction cup lifting cylinder 17 drives the lower mold suction cup 19 to rise together, so that the lower mold suction cup 19 contacts the hole opened on the fixed table panel 1, and then the lower mold suction cup 19 starts to evacuate, thereby sucking and fixing the lower mold located in the product placement fixture 4.

[0042] After the lower mold is sucked and fixed, the lifting servo drive mechanism 6 drives the pressing and welding mechanism 7 to descend together. When the upper mold suction cup 15 contacts the upper mold, the lifting servo drive mechanism 6 stops descending, and then the upper mold suction cup 15 starts to vacuum, thereby sucking and fixing the upper mold on the pressing fixture 14.

[0043] After the upper and lower molds are sucked and fixed at the same time, the lifting servo drive mechanism 6 drives the pressing and welding mechanism 7 to rise together, separating the upper mold from the lower mold. At this time, the injection mechanism of other processes injects liquid into the lower mold, and the injection mechanism withdraws after the injection is completed. Then the lifting servo drive mechanism 6 drives the pressing and welding mechanism 7 and the sucked upper mold to descend together, and put the upper mold back into the lower mold.

[0044] When the upper mold contacts the lower mold, the lifting servo drive mechanism 6 drives the pressing and welding mechanism 7 to continue to descend. During this process, only the pressing and welding mechanism fixed seat 8, the welding buffer cylinder 9, the counterweight slide rail 11 and the welding plate 13 in the pressing and welding mechanism 7 move and descend with the slider of the lifting servo drive mechanism 6. Since the counterweight 12 is in a sliding fit with the counterweight slide rail 11, the counterweight 12 and the pressing fixture 14 and the counterweight connecting rod 10 fixedly connected thereto remain stationary relative to the product placement fixture 4, so that the limiting cap 23 at the top of the counterweight connecting rod 10 is separated from the bottom of the pressing and welding mechanism fixed seat 8. At this time, the upper mold is only subjected to the gravity of the counterweight 12 and the pressing fixture 14, and is not subjected to the thrust of the servo. The gravity presses the upper mold into the lower mold at a fixed pressure each time.

[0045] In the process of the lifting servo drive mechanism 6 driving the pressing welding mechanism 7 to continue to descend, the welding plate 13 in the pressing welding mechanism 7 moves downward relative to the pressing fixture 14, and the power of the welding plate 13 is turned on at the same time. When the welding plate 13 contacts the upper mold, the telescopic rod of the welding buffer cylinder 9 will provide buffering for the welding pin of the welding plate 13 to prevent the welding pin from being crushed. At the same time, the welding of the upper mold and the lower mold begins. The lifting servo drive mechanism 6 will continue to drive the pressing welding mechanism 7 to descend until the welding pin of the welding plate 13 pierces the lower mold. During the welding process, the smoke duct 18 continues to absorb the smoke generated by welding from the central through hole of the lower mold suction cup 19.

[0046] After welding is completed, the welding plate 13 is powered off, and the lifting servo drive mechanism 6 is kept in the lowest position to allow the welded upper and lower molds to cool for a certain period of time. Then the lifting servo drive mechanism 6 drives the pressing and welding mechanism 7 to rise. During the rising process, due to the gravity factor of the counterweight block 12, the pressing jig 14 and the upper mold suction cup 15 remain stationary, and the welding plate 13 first separates from the lower mold and the upper mold. Then, when the pressing and welding mechanism fixing seat 8 rises and drives the limit cap 23, the pressing jig 14 and the upper mold suction cup 15 are separated from the upper mold under the drive of the counterweight block connecting rod 10. This can maintain the pressure on the welded upper and lower molds, so that the weld will not elastically reset due to incomplete cooling, thereby ensuring the stability of the welding.

[0047] When the lifting servo drive mechanism 6 drives the pressing and welding mechanism 7 to return to the initial position, the material taking mechanism of the subsequent process takes out the pressing jig 14 of the product after the pressing and welding.

[0048] The automatic mold closing and welding device for contact lens molding molds provided by the present invention integrates the pressing mechanism and welding mechanism of the upper and lower molds into a set of equipment, so that the mold closing and welding can be carried out simultaneously, and at the same time, a counterweight block with a fixed weight is used to provide stable pressure to press the upper and lower molds, and a pressure holding function is added during the pressing and welding process, thereby effectively improving the stability of the mold closing and improving the qualified rate of products.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An automatic mold closing and welding device for contact lens molding molds, characterized in that: The invention comprises a fixed table panel (1), a product placement jig (4), a servo pressing welding module (2) and a lower mold fixing device (3); at least one of the product placement jigs (4) is embedded in the upper surface of the fixed table panel (1); a corresponding lower mold fixing device (3) is arranged directly below each of the product placement jigs (4); the lower mold fixing device (3) is fixedly connected to the lower surface of the fixed table panel (1); the servo pressing welding module (2) comprises a servo pressing welding module fixing seat (5), a lifting servo drive The servo pressing welding module fixing seat (5) is fixedly mounted on the upper surface of the fixed table panel (1), and a corresponding pressing welding mechanism (7) is arranged directly above each product placement fixture (4). Each pressing welding mechanism (7) is mounted on the servo pressing welding module fixing seat (5) via a corresponding lifting servo driving mechanism (6), and the pressure head of each pressing welding mechanism (7) is respectively directed downwards towards the corresponding product placement fixture (4); The pressing and welding mechanism (7) comprises a pressing and welding mechanism fixing seat (8), a welding buffer cylinder (9), a counterweight block connecting rod (10), a counterweight block slide rail (11), a counterweight block (12), a welding plate (13), a pressing jig (14) and an upper mold suction cup (15). The welding buffer cylinder (9) is vertically downwardly installed inside the pressing and welding mechanism fixing seat (8). The welding buffer cylinder (9) is fixedly connected to the top surface inside the pressing and welding mechanism fixing seat (8). The lifting rod of the welding buffer cylinder (9) passes downward through the bottom of the pressing and welding mechanism fixing seat (8) and is fixedly connected to the welding plate (13). A plurality of vertical counterweight block slide rails (11) are arranged between the pressing and welding mechanism fixing seat (8) and the welding plate (13). The top end of each counterweight block slide rail (11) is fixedly connected to the lower surface of the pressing and welding mechanism fixing seat (8). Each counterweight block A counterweight block (12) is fixedly mounted on the slider of the slide rail (11); a vertical counterweight block connecting rod (10) is fixedly mounted on the upper surface of each counterweight block (12); the upper portion of each counterweight block connecting rod (10) is slidably connected to the bottom of the pressing welding mechanism fixing seat (8); the pressing jig (14) is slidably mounted on the welding plate (13) in an upward and downward manner; the top of the pressing jig (14) is fixedly connected to the lower surface of the counterweight block (12); an upper mold suction nozzle is fixedly mounted on the bottom of the pressing jig (14); all the upper mold suction nozzles constitute the upper mold suction cup (15); the air pressure of the welding buffer cylinder (9) is regulated by a pressure regulating valve, so that the telescopic rod has the function of slightly retracting when subjected to force and automatically extending and resetting when not subjected to force, so as to provide a buffer for the welding needle of the welding plate (13) when the welding needle contacts the upper mold.

2. The automatic mold closing and welding device for contact lens molding mold according to claim 1, characterized in that: The lifting servo drive mechanism (6) is composed of a Z-axis KK linear module (20), a KK linear module fixing plate (21) and a KK linear module drive motor (22); the Z-axis KK linear module (20) is fixedly mounted on the front side of the servo pressing and welding module fixing seat (5) via the KK linear module fixing plate (21); the KK linear module drive motor (22) is arranged at the top end of the Z-axis KK linear module (20) and is transmission-connected to the Z-axis KK linear module (20); the pressing and welding mechanism (7) is mounted on the slider of the Z-axis KK linear module (20).

3. The automatic mold closing and welding device for contact lens molding mold according to claim 1, characterized in that: The counterweight slide rail (11) is evenly arranged around the lifting rod of the welding buffer cylinder (9), and the pressing jig (14) is arranged in a ring shape on the welding plate (13) according to the arrangement shape of the counterweight slide rail (11). The upper mold suction nozzle is also arranged in a ring shape under the welding plate (13) according to the arrangement shape of the pressing jig (14), forming the upper mold suction cup (15).

4. The automatic mold closing and welding device for contact lens molding mold according to claim 1, characterized in that: The upper portion of the counterweight block connecting rod (10) is slidably arranged on the lower surface of the pressing welding mechanism fixing seat (8) up and down, and the top of the counterweight block connecting rod (10) is connected to a limit cap (23) for preventing the counterweight block connecting rod (10) from descending excessively after being inserted upward into the pressing welding mechanism fixing seat (8).

5. The automatic mold closing and welding device for contact lens molding mold according to claim 1, characterized in that: The pressing welding mechanism fixing seat (8) is formed by a pressing welding mechanism fixing upper plate, a pressing welding mechanism fixing lower plate, a pressing welding mechanism fixing side plate and a pressing welding mechanism fixing back plate. The internal space of the pressing welding mechanism fixing seat (8) is used to accommodate the main body of the welding buffer cylinder (9). The pressing welding mechanism fixing upper plate is used to fix the main body of the welding buffer cylinder (9). The pressing welding mechanism fixing lower plate is used to fix the counterweight block slide rail (11) and slidably connect the counterweight block connecting rod (10) and the lifting rod of the welding buffer cylinder (9). The pressing welding mechanism fixing back plate is used to connect to the lifting servo drive mechanism (6).

6. The automatic mold closing and welding device for contact lens molding mold according to claim 1, characterized in that: The lower mold fixing device (3) comprises a lower mold fixing device mounting seat (16), a lower mold suction cup lifting cylinder (17) and a lower mold suction cup (19); the upper surface of the lower mold fixing device mounting seat (16) is used for fixed connection with the lower surface of the fixed table panel (1); the lower mold suction cup lifting cylinder (17) is fixedly mounted on the front surface of the lower mold fixing device mounting seat (16); the lower mold suction cup (19) is mounted on the top of the lifting rod of the lower mold suction cup lifting cylinder (17); and the lower mold suction cup (19) is aligned upward with the corresponding product placement fixture (4).

7. The automatic mold closing and welding device for contact lens molding mold according to claim 6, characterized in that: A vertical dust collecting pipe (18) is fixedly mounted on the front surface of the lower mold suction cup lifting cylinder (17); the top end of the dust collecting pipe (18) is connected to the central through hole on the lower mold suction cup (19); and the bottom end of the dust collecting pipe (18) is used for connecting to a dust collecting device.

8. The automatic mold closing and welding device for contact lens molding mold according to claim 6, characterized in that: The lower mold suction cup (19) is composed of a lower mold suction cup base (24) and a plurality of lower mold suction nozzles (25). A central through hole (26) is provided in the center of the lower mold suction cup base (24) and is passed through from top to bottom. The lower mold suction nozzles (25) are fixedly mounted on the upper surface of the lower mold suction cup base (24) and are evenly distributed around the central through hole (26). A vacuum air path is provided inside the lower mold suction cup base (24). One end of the vacuum air path is connected to the lower mold suction nozzle (25), and the other end of the vacuum air path is connected to a vacuum interface provided on the side of the lower mold suction cup base (24).

9. The contact lens forming mold automatic mold closing and welding device according to claim 1, characterized in that: After welding is completed, the lifting servo drive mechanism (6) drives the welding plate (13) to remain at the lowest position for a certain period of time, and the welding plate (13) is in a power-off state, which plays a role in maintaining the pressure of the welded upper mold and the lower mold, while allowing the welded upper mold and the lower mold to cool down.

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