A mold inner preform rotating positioning device for molding glass aspherical lens

Abstract

The utility model discloses a kind of for moulding glass aspherical lens's mould inner prefabricated part rotating positioning device, mould inner prefabricated part rotating positioning device includes lifting slide, lifting drive mechanism, rotating assembly and positioning fixture;Lifting drive mechanism is connected with lifting slide, to drive lifting slide to do lifting motion;Positioning fixture is set on rotating assembly, and the bottom of positioning fixture is equipped with the positioning hole for positioning prefabricated part;Rotating assembly is set on lifting slide, and rotating assembly drives positioning fixture and prefabricated part rotating sleeve joint, to position prefabricated part.The utility model in the middle, lifting drive mechanism drives lifting slide to do lifting motion, and lifting slide is then driven positioning fixture to do lifting motion by rotating assembly, and positioning fixture drops to mould, until positioning fixture and presses prefabricated part, and rotating assembly is then driven positioning fixture counterclockwise or clockwise rotation, to make positioning hole sleeve on prefabricated part, to push prefabricated part to mould center, to realize prefabricated part repositioning in mould.

Description

Technical Field

[0001] This utility model relates to the technical field of positioning equipment for molded glass aspherical lenses, and more particularly to a preform rotation positioning device for molded glass aspherical lenses. Background Technology

[0002] Aspherical lenses have a gradually increasing radius of curvature from the center to the periphery. Compared to traditional spherical lenses, they are lighter, thinner, and flatter, offering a wider field of vision, better image correction, less visual distortion, and more natural and realistic images. Therefore, aspherical lenses provide a superior user experience. However, they also require higher precision in their manufacturing process. One of the molding processes for aspherical lenses is compression molding, which involves using a robotic arm to place the pre-formed component into a mold.

[0003] For some products, the preform material needs to be placed at a relatively high position inside the mold. Although the robotic arm of the molding machine uses positioning grippers outside the mold to precisely position the preform, there is a certain probability that displacement will occur when the robotic arm releases the preform after placing it inside the mold, such as when the preform is picked up by a suction nozzle and the vacuum is broken before being placed into the mold. This displacement can lead to insufficient optical uniformity inside the molded aspherical lens, local refractive index distortion, and thus the problem of poor material properties. Utility Model Content

[0004] In order to solve the technical problem of poor quality caused by displacement of the preform when it is put into the mold during the processing of aspherical lenses in the prior art, one of the objectives of this utility model is to provide a preform rotation positioning device for molding aspherical glass lenses.

[0005] One of the objectives of this utility model is achieved through the following technical solution: A preform rotation positioning device for molding aspherical glass lenses, the preform rotation positioning device comprising a lifting slide plate, a lifting drive mechanism, a rotating assembly and a positioning fixture; The lifting drive mechanism is connected to the lifting slide plate to drive the lifting slide plate to perform lifting and lowering movements; The positioning fixture is disposed on the rotating assembly, and the bottom of the positioning fixture is provided with a positioning hole for positioning the prefabricated part; The rotating component is mounted on the lifting slide plate. The rotating component drives the positioning fixture to rotate and engage with the precast component in order to position the precast component.

[0006] Optionally, the lower end of the positioning hole is provided with a chamfer or rounded corner for guiding the preform into the positioning hole; or The lower opening of the positioning hole has a gradient section, and the inner diameter of the gradient section gradually increases from top to bottom.

[0007] Optionally, the rotating assembly includes a rotating drive element, a mounting mechanism, and a rotating shaft; The mounting mechanism is mounted on the lifting slide plate, and the rotating shaft is rotatably mounted on the mounting mechanism. The upper end of the rotating shaft is connected to a rotation drive element, and the lower end of the rotating shaft is connected to a positioning fixture.

[0008] Optionally, the rotating assembly further includes a buffer mechanism disposed at the lower end of the rotating shaft; The positioning fixture is mounted on the buffer mechanism.

[0009] Optionally, the buffer mechanism includes a connecting sleeve and a buffer member. The connecting sleeve is provided with a sliding assembly hole and a buffer hole. The sliding assembly hole is located at the upper end of the connecting sleeve, and the buffer hole is located below the sliding assembly hole. The buffer hole communicates with the sliding assembly hole, and the diameter of the buffer hole is larger than the diameter of the sliding assembly hole. The lower end of the rotating shaft is provided with a limiting block, which protrudes from the circumferential surface of the rotating shaft. The lower end of the rotating shaft slides up and down with the sliding assembly hole. The limiting block is located in the buffer hole and can move up and down within the buffer hole. The positioning fixture is fixedly connected to the lower end of the connecting sleeve; The buffer is disposed in the buffer hole, with the upper end of the buffer abutting against the limiting block and the lower end of the buffer abutting against the connecting sleeve or positioning fixture.

[0010] Optionally, the mounting mechanism includes a mounting plate, a parallelism adjustment plate, and several gap plates; The parallelism adjustment plate is fixed to the lifting slide plate; The mounting plate is provided with through holes, and the mounting plate is disposed on the lower surface of the parallelism adjustment plate; A plurality of the aforementioned gap plates are disposed between the parallelism adjusting plate and the mounting plate and are respectively located at the four corners of the mounting plate; The rotating shaft passes through the through hole and is fitted with the through hole with a clearance.

[0011] Optionally, the rotating assembly further includes an origin sensor and a sensing plate, the sensing plate being connected to the rotating shaft, and the origin sensor being fixed on the lifting slide plate and located on the rotation trajectory of the sensing plate.

[0012] Optionally, the outer diameter of the positioning fixture is adapted to the inner diameter of the mold.

[0013] Optionally, the clearance fit between the outer diameter of the positioning fixture and the inner diameter of the mold is -0.005 to -0.01 mm.

[0014] Optionally, the lifting slide plate is provided with a connecting block; The lifting drive mechanism includes a push rod and a floating joint. The push rod is connected to the floating joint, and the floating joint is connected to the connecting block.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: In this invention, a lifting drive mechanism drives a lifting slide plate to move up and down. The lifting slide plate, in turn, drives a positioning fixture to move up and down via a rotating component. The positioning fixture descends into the mold until it presses against the preform. The rotating component then rotates the positioning fixture counterclockwise or clockwise, causing the positioning hole to fit onto the preform, thus pushing the preform towards the center of the mold and achieving repositioning of the preform within the mold. Specifically, the preform rotation positioning device within the mold is mounted and fixed on a robotic arm or a moving platform. Taking a robotic arm as an example, the robotic arm moves the preform rotation positioning device within the mold directly above the mold. At this time, the lifting drive mechanism pushes the lifting slide plate down, and the rotating component and positioning fixture descend accordingly. The positioning fixture extends into the mold at a set speed, causing it to move towards the preform. During the contact at the bottom of the positioning fixture or during the descent of the positioning fixture, the rotating component drives the positioning fixture to rotate, so that the positioning hole fits onto the preform and the preform assembly is embedded in the positioning hole. The preform fitted into the positioning hole will be driven to the center of the mold. In this way, the positioning of the preform in the mold can be completed, improving the positional accuracy of the preform and thus avoiding the problem of aspherical lenses having poor camber. Attached Figure Description

[0016] Figure 1 This is a front structural diagram of the preform rotation positioning device in the mold of this utility model; Figure 2 This is a side sectional view of the preform rotation positioning device in the mold of this utility model; Figure 3 This is a cross-sectional schematic diagram of the rotating component and positioning fixture in the preform rotation positioning device in the mold of this utility model. Figure 4 This is a cross-sectional view of the positioning fixture and the mold in the preform rotation positioning device of this utility model.

[0017] Explanation of reference numerals in the attached diagram: 1. Lifting slide plate; 2. Lifting drive mechanism; 21. Push rod; 22. Floating joint; 3. Rotating assembly; 31. Rotating drive element; 32. Mounting mechanism; 321. Mounting plate; 322. Parallelism adjusting plate; 33. Rotating shaft; 331. Limiting block; 34. Buffering mechanism; 341. Connecting sleeve; 3411. Sliding assembly hole; 3412. Buffer hole; 342. Buffer component; 35. Origin sensor; 36. Sensing plate; 4. Positioning fixture; 41. Positioning hole; 411. Chamfer; 5. Molds; 6. Precast components. Detailed Implementation

[0018] The following will refer to the appendices in the embodiments of this application. Figure 1 To be continued Figure 4 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0020] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0021] In the molding process of aspherical lenses, the molding machine typically uses a robotic arm to grip the preform 6, with some robotic arms using suction nozzles to pick up the preform 6. Before the preform 6 is fed in, the robotic arm of the molding machine performs precise positioning of the preform 6 outside the mold 5, including positioning the angle and position of the preform 6 on the robotic arm; then, the robotic arm places the preform 6 inside the mold 5; finally, the robotic arm releases the preform 6, a process in which the suction nozzle breaks the vacuum and detaches from the preform 6. The process of breaking the vacuum involves a certain amount of vibration, which has a certain probability of causing the preform 6 to shift, resulting in a displacement of the preform 6 within the mold 5.

[0022] like Figure 1-4 As shown, in order to reposition the preform 6 inside the mold 5, this utility model provides a preform rotation positioning device for molding aspherical glass lenses. The preform rotation positioning device includes a lifting slide plate 1, a lifting drive mechanism 2, a rotating component 3, and a positioning fixture 4.

[0023] The lifting drive mechanism 2 is connected to the lifting slide plate 1 to drive the lifting slide plate 1 to perform lifting and lowering movements. The positioning fixture 4 is set on the rotating assembly 3, and the bottom of the positioning fixture 4 is provided with a positioning hole 41 for positioning the precast part 6. The rotating assembly 3 is set on the lifting slide plate 1, and the rotating assembly 3 drives the positioning fixture 4 to rotate and engage with the precast part 6 to position the precast part 6.

[0024] In this invention, the lifting drive mechanism 2 drives the lifting slide plate 1 to move up and down. The lifting slide plate 1, in turn, drives the positioning fixture 4 to move up and down via the rotating component 3. The positioning fixture 4 descends into the mold 5 until it presses against the preform 6. The rotating component 3 then drives the positioning fixture 4 to rotate counterclockwise or clockwise, causing the positioning hole 41 to fit onto the preform 6, thereby pushing the preform 6 towards the center of the mold 5 and repositioning the preform 6 within the mold 5. Specifically, the preform rotation positioning device within the mold is installed and fixed on a robotic arm or a moving platform. Taking a robotic arm as an example, the robotic arm moves the preform rotation positioning device within the mold to directly above the mold 5. At this time, the lifting drive mechanism 2 pushes the lifting slide plate 1 down, and the rotating component 3 and the positioning fixture 4 descend accordingly. The positioning fixture 4 extends into the mold 5 at a set speed, causing the positioning fixture 4 to move towards the preform 6. During the contact at the bottom of the positioning fixture 4 or during the descent of the positioning fixture 4, the rotating component 3 drives the positioning fixture 4 to rotate, so that the positioning hole 41 is fitted onto the preform 6, and the preform 6 is embedded in the positioning hole 41. The preform 6 fitted into the positioning hole 41 will be driven to the center of the mold 5. In this way, the positioning of the preform 6 in the mold 5 can be completed, improving the positional accuracy of the preform 6, thereby avoiding the problem of aspherical lens having poor thickness.

[0025] For the rotary connection between the positioning fixture 4 and the prefabricated part 6, compared to the direct connection, the rotary connection can drive... The lifting slide plate 1 is installed on a sliding assembly structure. Specifically, the sliding assembly mechanism includes a guide rail and a slider. The slider is slidably set on the guide rail, and the lifting slide plate 1 is fixed on the slider. In this way, the lifting slide plate 1 can be lifted and lowered freely, stably, and precisely under the drive of the lifting drive mechanism 2.

[0026] In some further embodiments of the positioning hole 41, such as Figure 3As shown, the lower end of the positioning hole 41 is provided with a chamfer 411 or a rounded corner, which is used to guide the preform 6 into the positioning hole 41. Alternatively, a gradient section can be provided at the lower opening of the positioning hole 41, with the inner diameter of the gradient section gradually increasing from top to bottom. In this way, when the positioning fixture 4 rotates, the chamfer 411, rounded corner, or gradient section can guide the preform 6 into the positioning hole 41, thereby improving the convenience of positioning.

[0027] In some embodiments of the rotating component 3, such as Figures 1 to 3 As shown, the rotating assembly 3 includes a rotating drive element 31, a mounting mechanism 32, and a rotating shaft 33. The rotating drive element 31 and the mounting mechanism 32 are mounted on the lifting slide plate 1. The rotating shaft 33 is rotatably mounted on the mounting mechanism 32. The upper end of the rotating shaft 33 is connected to the rotating drive element 31, and the lower end of the rotating shaft 33 is connected to the positioning fixture 4. The rotating drive element 31 outputs rotational motion to the rotating shaft 33, while the rotating shaft 33 is rotatably mounted on the mounting mechanism 32, causing the positioning fixture 4 to rotate.

[0028] The rotary drive element 31 can be a pneumatic motor or an electric motor.

[0029] The rotating shaft 33 is rotatably mounted on the mounting mechanism 32. Specifically, a bearing is provided in the through hole of the mounting plate 321, and the rotating shaft 33 is mounted on the mounting plate 321 through the bearing.

[0030] Furthermore, such as Figure 2 , Figure 3 As shown, the rotating assembly 3 also includes a buffer mechanism 34, which is disposed at the lower end of the rotating shaft 33. A positioning fixture 4 is disposed on the buffer mechanism 34. Thus, when the positioning fixture 4 contacts the preform 6 and the positioning hole 41 is fitted onto the preform 6, the buffer mechanism 34 can buffer the pressure between the positioning fixture 4 and the preform 6, preventing damage to the preform 6. Furthermore, since different molds 5 have height differences, when the positioning fixture 4 descends to the same height, the buffer mechanism 34 helps the positioning fixture 4 adapt to molds 5 of different heights, preventing damage to the mold 5.

[0031] In some embodiments of the buffer mechanism 34, such as Figure 3 As shown, the buffer mechanism 34 includes a connecting sleeve 341 and a buffer member 342. The connecting sleeve 341 is provided with a sliding assembly hole 3411 and a buffer hole 3412. The sliding assembly hole 3411 is located at the upper end of the connecting sleeve 341, and the buffer hole 3412 is located below the sliding assembly hole 3411. The buffer hole 3412 communicates with the sliding assembly hole 3411, and the diameter of the buffer hole 3412 is larger than the diameter of the sliding assembly hole 3411.

[0032] A limiting block 331 is provided at the lower end of the rotating shaft 33. The limiting block 331 protrudes from the circumferential surface of the rotating shaft 33. The lower end of the rotating shaft 33 slides vertically with the sliding assembly hole 3411. The limiting block 331 is located in the buffer hole 3412 and can move up and down within the buffer hole 3412. The positioning fixture 4 is fixedly connected to the lower end of the connecting sleeve 341. The buffer member 342 is disposed in the buffer hole 3412. The upper end of the buffer member 342 abuts against the limiting block 331, and the lower end of the buffer member 342 abuts against the connecting sleeve 341 or the positioning fixture 4.

[0033] In this way, the connector can slide within the sliding assembly hole 3411, and the limiting block 331 prevents it from falling off. At the same time, the limiting block 331 and the positioning fixture 4 compress the buffer 342, and the buffer 342 achieves the buffering function, avoiding direct hard pressure on the precast part 6 and preventing the precast part 6 from being crushed.

[0034] In another flexible mounting embodiment of the positioning fixture 4, such as Figure 2 As shown, the difference is that the buffer 342 is sleeved on the rotating shaft 33 and located between the mounting mechanism 32 and the connecting sleeve 341. The upper end of the buffer 342 abuts against the mounting mechanism 32, and the lower end of the buffer 342 abuts against the connecting sleeve 341.

[0035] Regarding the aforementioned sliding mounting hole 3411, the sliding mounting hole 3411 is specifically a square hole or a circular hole with a guide protrusion. The shape of the lower end of the connector is adapted to the sliding mounting hole 3411. For example, when the sliding mounting hole 3411 is a square hole, the lower end of the connector is square. In this way, through a specific shape fit, the connector is guided to move up and down, and the rotational motion is transmitted to the connecting sleeve 341, thereby compressing or releasing the buffer 342. As another example, the sliding mounting hole 3411 is a circular hole with a guide protrusion, and the lower end of the connector is cylindrical and has a guide groove extending up and down along the axial direction on its surface. In this way, through the limiting fit of the guide protrusion and the guide groove, and the shape fit of the circular hole and the cylinder, the connector is guided to move up and down, and the rotational motion is transmitted to the connecting sleeve 341, thereby compressing or releasing the buffer 342.

[0036] The buffer 342 is specifically a spring or elastic rubber.

[0037] In some embodiments of the mounting mechanism 32, such as Figure 3As shown, the mounting mechanism 32 includes a mounting plate 321, a parallelism adjusting plate 322, and several gap plates. The parallelism adjusting plate 322 is fixed to the lifting slide plate 1. The mounting plate 321 has a through hole and is located on the lower surface of the parallelism adjusting plate 322. Several gap plates are located between the parallelism adjusting plate 322 and the mounting plate 321, respectively at the four corners of the mounting plate 321. The rotating shaft 33 passes through the through hole and is fitted with a clearance fit. Therefore, the levelness of the mounting plate 321 can be adjusted by adding, removing, or replacing the gap plates at the four corners. The gap plates are thin sheet structures, and the thicknesses of the gap plates can be 1.01mm, 1.02mm, 1.03mm, 1.04mm, 1.1mm, 1.2mm, 1.3mm, and 1.4mm, respectively.

[0038] In some further embodiments of the rotating component 3, such as Figure 1 , Figure 2 As shown, the rotating assembly 3 also includes an origin sensor 35 and a sensing plate 36. The sensing plate 36 is connected to the rotating shaft 33, and the origin sensor 35 is fixed on the lifting slide plate 1 and located on the rotation trajectory of the sensing plate 36. By simultaneously setting the origin sensor 35 and the sensing plate 36, the origin sensor 35 senses the position of the sensing plate 36 on the rotating shaft 33, and the origin sensor 35 and the sensing plate 36 work together to locate the origin position of the rotating shaft 33, facilitating the reset of the rotating shaft 33.

[0039] The outer diameter of the positioning fixture 4 is compatible with the inner diameter of the mold 5. When the positioning fixture 4 is inserted into the mold 5, the inner diameter of the mold 5 positions the outer diameter of the positioning fixture 4, thereby avoiding or reducing assembly and driving errors caused by structures such as the lifting slide plate 1, the lifting drive mechanism 2, and the rotating component 3.

[0040] Furthermore, the clearance fit between the outer diameter of the positioning fixture 4 and the inner diameter of the mold 5 is -0.005 to -0.01 mm. This ensures that the mold 5 has good positioning accuracy for the positioning fixture 4, guarantees the positional accuracy of the positioning fixture 4 during the lifting and lowering process, and improves the positioning accuracy of the preform 6.

[0041] For lifting drive mechanism 2, such as Figure 1 , Figure 2 As shown, the lifting drive mechanism 2 includes a push rod 21, which is connected to the lifting slide plate 1. Preferably, the push rod 21 is pneumatic, thus providing a certain buffering effect to prevent hard contact between the positioning fixture 4 and the precast component 6, and to avoid damaging the precast component 6.

[0042] Furthermore, such as Figure 1 , Figure 2As shown, the upper end of the lifting slide plate 1 is provided with a connecting block, and the lifting drive mechanism 2 also includes a floating joint 22, one end of which is connected to the push rod 21 and the other end is connected to the connecting block. The rotating component 3 is located at the lower end of the lifting slide plate 1.

[0043] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A preform rotation positioning device for molding aspherical glass lenses, characterized in that, The preform rotation positioning device in the mold includes a lifting slide plate, a lifting drive mechanism, a rotating component, and a positioning fixture; The lifting drive mechanism is connected to the lifting slide plate to drive the lifting slide plate to perform lifting and lowering movements; The positioning fixture is disposed on the rotating assembly, and the bottom of the positioning fixture is provided with a positioning hole for positioning the prefabricated part; The rotating component is mounted on the lifting slide plate. The rotating component drives the positioning fixture to rotate and engage with the precast component in order to position the precast component.

2. The preform rotation positioning device for molding aspherical glass lenses as described in claim 1, characterized in that, The lower end of the positioning hole is provided with a chamfer or rounded corner for guiding the prefabricated part into the positioning hole; or The lower opening of the positioning hole has a gradient section, and the inner diameter of the gradient section gradually increases from top to bottom.

3. The preform rotation positioning device for molding aspherical glass lenses as described in claim 1, characterized in that, The rotating assembly includes a rotating drive element, a mounting mechanism, and a rotating shaft; The mounting mechanism is mounted on the lifting slide plate, and the rotating shaft is rotatably mounted on the mounting mechanism. The upper end of the rotating shaft is connected to a rotation drive element, and the lower end of the rotating shaft is connected to a positioning fixture.

4. The preform rotation positioning device for molding aspherical glass lenses as described in claim 3, characterized in that, The rotating assembly also includes a buffer mechanism, which is disposed at the lower end of the rotating shaft; The positioning fixture is mounted on the buffer mechanism.

5. The preform rotation positioning device for molding aspherical glass lenses as described in claim 4, characterized in that, The buffer mechanism includes a connecting sleeve and a buffer component. The connecting sleeve has a sliding assembly hole and a buffer hole. The sliding assembly hole is located at the upper end of the connecting sleeve, and the buffer hole is located below the sliding assembly hole. The buffer hole communicates with the sliding assembly hole, and the diameter of the buffer hole is larger than the diameter of the sliding assembly hole. The lower end of the rotating shaft is provided with a limiting block, which protrudes from the circumferential surface of the rotating shaft. The lower end of the rotating shaft slides up and down with the sliding assembly hole. The limiting block is located in the buffer hole and can move up and down within the buffer hole. The positioning fixture is fixedly connected to the lower end of the connecting sleeve; The buffer is disposed in the buffer hole, with the upper end of the buffer abutting against the limiting block and the lower end of the buffer abutting against the connecting sleeve or positioning fixture.

6. The preform rotation positioning device for molding aspherical glass lenses as described in claim 3, characterized in that, The mounting mechanism includes a mounting plate, a parallelism adjustment plate, and several gap plates; The parallelism adjustment plate is fixed to the lifting slide plate; The mounting plate is provided with through holes, and the mounting plate is disposed on the lower surface of the parallelism adjustment plate; A plurality of the aforementioned gap plates are disposed between the parallelism adjusting plate and the mounting plate and are respectively located at the four corners of the mounting plate; The rotating shaft passes through the through hole and is fitted with a clearance in the through hole.

7. The preform rotation positioning device for molding aspherical glass lenses as described in claim 3, characterized in that, The rotating assembly also includes an origin sensor and a sensing plate. The sensing plate is connected to the rotating shaft, and the origin sensor is fixed on the lifting slide plate and located on the rotation trajectory of the sensing plate.

8. The preform rotation positioning device for molding aspherical glass lenses as described in claim 1, characterized in that, The outer diameter of the positioning fixture is compatible with the inner diameter of the mold.

9. The preform rotation positioning device for molded aspherical glass lenses as described in claim 8, characterized in that, The clearance fit between the outer diameter of the positioning fixture and the inner diameter of the mold is -0.005 to -0.01 mm.

10. The preform rotation positioning device for molding aspherical glass lenses as described in claim 1, characterized in that, The lifting slide plate is equipped with a connecting block; The lifting drive mechanism includes a push rod and a floating joint. The push rod is connected to the floating joint, and the floating joint is connected to the connecting block.

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