A mold-in-preform positioning device for a press molded glass aspheric lens

Abstract

The utility model discloses a kind of for moulding glass aspherical lens's mould inner prefabricated part positioning device, the mould inner prefabricated part positioning device includes lifting slide, lifting drive mechanism, mounting mechanism and positioning fixture;The lifting drive mechanism is connected with the lifting slide, to drive the lifting slide to do lifting motion;The mounting mechanism is set on the lifting slide, for installing the positioning fixture;The positioning fixture is set on the mounting mechanism, the bottom of the positioning fixture is equipped with opening, the opening is equipped with the positioning inclined plane for positioning prefabricated part.In the utility model, lifting drive mechanism drives lifting slide to do lifting motion, lifting slide is then driven positioning fixture to do lifting motion by mounting mechanism, positioning fixture drops into mould, until positioning fixture is pressed against prefabricated part, to push prefabricated part to mould center, to realize prefabricated part repositioning in mould, to avoid the problem that aspherical lens produces partial meat bad.

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 positioning device for preforms in a mold 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 positioning device in the mold for molding aspherical glass lenses.

[0005] One of the objectives of this utility model is achieved through the following technical solution:

[0006] A preform positioning device for molding aspherical glass lenses, the preform positioning device comprising a lifting slide plate, a lifting drive mechanism, an installation mechanism, and a positioning fixture;

[0007] The lifting drive mechanism is connected to the lifting slide plate to drive the lifting slide plate to perform lifting and lowering movements;

[0008] The mounting mechanism is mounted on the lifting slide plate and is used to mount the positioning fixture;

[0009] The positioning fixture is mounted on the installation mechanism. The bottom of the positioning fixture has an opening, and the opening has a positioning ramp for positioning the prefabricated component.

[0010] Optionally, the positioning inclined surface is an annular conical surface.

[0011] Optionally, the positioning fixture is elastically mounted on the mounting mechanism.

[0012] Optionally, the mounting mechanism includes a mounting plate, a connector, and a first buffer.

[0013] The mounting plate has a through hole, the connector passes through the through hole and is fitted with the through hole with a clearance. The upper end of the connector is exposed on the upper surface of the mounting plate, and the lower end of the connector is exposed on the lower surface of the mounting plate. The lower end of the connector is connected to the positioning fixture. The first buffer is sleeved on the lower end of the connector and is located between the mounting plate and the positioning fixture. The first buffer applies elastic force to the positioning fixture.

[0014] Optionally, the mounting mechanism further includes a parallelism adjusting plate and a plurality of gap pieces. The parallelism adjusting plate is fixed on the lifting slide plate, the mounting plate is disposed on the lower surface of the parallelism adjusting plate, and the plurality of gap pieces are disposed between the parallelism adjusting plate and the mounting plate and are respectively located at the four corners of the mounting plate.

[0015] Optionally, the connector includes a quick-release head and a quick-release rod. The quick-release head is located on the upper surface of the mounting plate, and the quick-release rod passes through the through hole and slides in the through hole. The upper end of the quick-release rod is quickly connected to the quick-release head, and the lower end of the quick-release rod is connected to the positioning fixture.

[0016] Optionally, the outer diameter of the positioning fixture is adapted to the inner diameter of the mold.

[0017] 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.

[0018] Optionally, the lifting drive mechanism includes a push rod, which is connected to the lifting slide plate.

[0019] Optionally, the lifting slide plate is provided with a connecting block, and the lifting drive mechanism further includes a floating joint, one end of which is connected to the push rod and the other end of which is connected to the connecting block.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 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 an installation mechanism. The positioning fixture descends into the mold until it presses against the preform, thus pushing the preform towards the center of the mold and achieving repositioning of the preform within the mold. Specifically, the preform 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 positioning device to the top of the mold. At this time, the lifting drive mechanism pushes the lifting slide plate down, and the installation mechanism and positioning fixture descend accordingly. The positioning fixture extends into the mold at a set speed until the positioning inclined surface at the bottom of the positioning fixture presses against the preform, moving the preform towards the center of the mold. The positioning fixture repeats this lifting and lowering motion 2-3 times to complete the precise positioning of the preform within the mold, thereby avoiding the problem of poor positioning of aspherical lenses. Attached Figure Description

[0022] Figure 1 This is a front structural schematic diagram of the preform positioning device inside the mold of this utility model;

[0023] Figure 2 This is a side view of the preform positioning device inside the mold according to the present invention.

[0024] Figure 3 This is a cross-sectional view of the elastic connection of the preform positioning device in the mold of this utility model;

[0025] Figure 4 A cross-sectional view of another elastic connection of the preform positioning device in the mold of this utility model;

[0026] Figure 5 This is a cross-sectional view of the preform positioning device in the mold of this utility model.

[0027] Explanation of reference numerals in the attached diagram:

[0028] 1. Lifting slide;

[0029] 2. Lifting drive mechanism; 21. Push rod; 22. Floating joint;

[0030] 3. Mounting mechanism; 31. Mounting plate; 311. Through hole; 32. Connector; 321. Limiting block; 33. First buffer component; 34. Connecting sleeve; 341. Sliding assembly hole; 342. Buffer hole; 35. Second buffer component; 36. Parallelism adjustment plate;

[0031] 4. Positioning fixture; 41. Positioning slope;

[0032] 5. Molds;

[0033] 6. Precast components. Detailed Implementation

[0034] The following will refer to the appendices in the embodiments of this application. Figure 1 To be continued Figure 5 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.

[0035] It should be noted that all directional indicators (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 indicator will also change accordingly.

[0036] 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.

[0037] 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.

[0038] like Figure 1 , Figure 2 and Figure 5 As shown, in order to reposition the preform 6 inside the mold 5, this utility model provides a preform positioning device inside the mold for molding aspherical glass lenses. The preform positioning device inside the mold includes a lifting slide plate 1, a lifting drive mechanism 2, an installation mechanism 3, and a positioning fixture 4.

[0039] The lifting drive mechanism 2 is connected to the lifting slide plate 1 to drive the lifting slide plate 1 to move up and down. The mounting mechanism 3 is set on the lifting slide plate 1 and is used to install the positioning fixture 4. Specifically, the lifting drive mechanism 2 is connected to the upper end of the lifting slide plate 1, and the mounting mechanism 3 is set at the lower end of the lifting slide plate 1. The positioning fixture 4 is set on the mounting mechanism 3, and the bottom of the positioning fixture 4 has an opening with a positioning ramp 41 for positioning the prefabricated part 6.

[0040] 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 through the mounting mechanism 3. The positioning fixture 4 descends into the mold 5 until it presses against the preform 6, thereby pushing the preform 6 towards the center of the mold 5, thus repositioning the preform 6 within the mold 5. Specifically, the preform 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 positioning device within the mold 5 directly above it. At this time, the lifting drive mechanism 2 pushes the lifting slide plate 1 down, and the mounting mechanism 3 and the positioning fixture 4 descend accordingly. The positioning fixture 4 extends into the mold 5 at a set speed until the positioning inclined surface 41 at the bottom of the positioning fixture 4 presses against the preform 6, moving the preform 6 towards the center of the mold 5. The positioning fixture 4 repeats this lifting and lowering motion 2-3 times to complete the positioning of the preform 6 within the mold 5, improving the positional accuracy of the preform and thus avoiding the problem of poor surface coverage in aspherical lenses.

[0041] 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.

[0042] The positioning inclined surface 41 can be a ring-shaped cone. The positioning inclined surface 41 can also be several planes distributed along the circumference, such as four planes forming a quadrangular frustum.

[0043] In addition, the positioning fixture 4 is elastically mounted on the mounting mechanism 3. Thus, when the positioning inclined surface 41 on the positioning fixture 4 presses against the precast part 6, the elastic mounting of the positioning fixture 4 can buffer the pressure between the positioning fixture 4 and the precast part 6, and prevent damage to the precast part 6.

[0044] In one of the resilient mounting embodiments of the positioning fixture 4, such as Figure 2 , Figure 3 , Figure 5 As shown, the mounting mechanism 3 includes a mounting plate 31, a connector 32, and a first buffer 33.

[0045] The mounting plate 31 has a through hole 311. The connector 32 passes through the through hole 311 and is loosely fitted with it. The connector 32 can move along the axis of the through hole 311. The upper end of the connector 32 protrudes from the upper surface of the mounting plate 31, and the lower end of the connector 32 protrudes from the lower surface of the mounting plate 31. The lower end of the connector 32 is connected to the positioning fixture 4. The first buffer 33 is sleeved on the lower end of the connector 32 and is located between the mounting plate 31 and the positioning fixture 4. The first buffer 33 applies elastic force to the positioning fixture 4. When the positioning fixture 4 abuts against the precast part 6, as the lifting slide plate 1 descends, the connector 32 slides in the through hole 311 and rises relative to the through hole 311. The mounting plate 31 compresses the first buffer 33, thereby buffering the pressure and preventing direct hard pressure on the precast part 6, thus preventing the precast part 6 from being crushed.

[0046] The first buffer element 33 can be a spring or a rubber buffer block.

[0047] Furthermore, the connector 32 is a quick-release structure. Specifically, the connector 32 includes a quick-release head and a quick-release rod. The quick-release head is located on the upper surface of the mounting plate 31, and the quick-release rod passes through the through hole 311 and slides in fit with the through hole 311. The upper end of the quick-release rod is quickly connected to the quick-release head, and the lower end of the quick-release rod is connected to the positioning fixture 4. Through the quick-release rod, the positioning fixture 4 can be quickly replaced, facilitating the installation of different prefabricated parts 6.

[0048] The specific structure of quick-release heads and quick-release levers can be referenced from quick-release pipe structures, such as the quick-release structure of a washing machine's water inlet pipe.

[0049] In another flexible mounting embodiment of the positioning fixture 4, such as Figure 2 , Figure 4 As shown, the mounting mechanism 3 includes a mounting plate 31, a connector 32, a connecting sleeve 34, and a second buffer 35.

[0050] Mounting plate 31 is mounted on lifting slide plate 1, and connector 32 is fixed to mounting plate 31, with the lower end of connector 32 protruding from the lower surface of mounting plate 31. Connecting sleeve 34 has a sliding assembly hole 341 and a buffer hole 342. The sliding assembly hole 341 is located at the upper end of connecting sleeve 34, and the buffer hole 342 is located below the sliding assembly hole 341, communicating with it. The diameter of the buffer hole 342 is larger than the diameter of the sliding assembly hole 341. A limiting block 321 is provided at the lower end of connector 32, protruding from the circumferential surface of connector 32. The lower end of connector 32 slides vertically with the sliding assembly hole 341. The limiting block 321 is located within the buffer hole 342 and can move vertically within it. Simultaneously, the limiting block 321 prevents connector 32 from slipping out of the sliding assembly hole 341. Positioning fixture 4 is fixedly connected to the lower end of connecting sleeve 34. The second buffer 35 is disposed within the buffer hole 342. The upper end of the second buffer 35 abuts against the limiting block 321, and the lower end of the second buffer 35 abuts against the connecting sleeve 34 or the positioning fixture 4. In this way, the connecting piece 32 can slide within the sliding assembly hole 341, with the limiting block 321 preventing it from falling off, while the second buffer 35 provides a buffering function, avoiding direct hard pressure on the precast part 6 and preventing the precast part 6 from being crushed.

[0051] Compared to the previous flexible installation embodiment, in this embodiment, the connector 32 is fixedly assembled to the mounting plate 31, and the lower end of the connector 32 is slidably connected to the aforementioned connecting sleeve 34. The second buffer 35 is built into the buffer hole 342. Thus, when the positioning fixture 4 abuts against the precast part 6, as the lifting slide plate 1 descends, the connector 32 compresses the second buffer 35 in the buffer hole 342, thereby buffering the pressure and avoiding direct hard pressure on the precast part 6, thus preventing the precast part 6 from being crushed.

[0052] The sliding mounting hole 341 can be a circular hole, a square hole, or a circular hole with a guide protrusion. The lower end of the connector 32 is adapted to the shape of the sliding mounting hole 341. For example, when the sliding mounting hole 341 is a square hole, the lower end of the connector 32 is also square. In this way, through the specific shape matching, the connector 32 is guided to move up and down and prevented from rotating, thereby compressing or releasing the second buffer 35. Alternatively, if the sliding mounting hole 341 is a circular hole with a guide protrusion, the lower end of the connector 32 is cylindrical and has a guide groove extending vertically 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 matching of the circular hole and the cylinder, the connector 32 is guided to move up and down and prevented from rotating, thereby compressing or releasing the second buffer 35.

[0053] The second buffer 35 can be a spring or a rubber buffer block.

[0054] In a further embodiment of the mounting mechanism 3, such as Figure 2 As shown, the mounting mechanism 3 also includes a parallelism adjusting plate 36 and several gap plates. The parallelism adjusting plate 36 is fixed to the lifting slide plate 1, and the mounting plate 31 is disposed on the lower surface of the parallelism adjusting plate 36. The several gap plates are disposed between the parallelism adjusting plate 36 and the mounting plate 31 and are respectively located at the four corners of the mounting plate 31. In this way, the levelness of the mounting plate 31 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 several gap plates can be 1.01mm, 1.02mm, 1.03mm, 1.04mm, 1.1mm, 1.2mm, 1.3mm, and 1.4mm, respectively.

[0055] Regarding the positioning fixture 4 itself, such as Figure 5 As shown, the outer diameter of the positioning fixture 4 is matched 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 mounting mechanism 3.

[0056] 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.

[0057] For lifting drive mechanism 2, such as 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.

[0058] Furthermore, 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.

[0059] 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 positioning device for molding aspherical glass lenses, characterized in that, The preform positioning device in the mold includes a lifting slide plate, a lifting drive mechanism, an installation mechanism, 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 mounting mechanism is mounted on the lifting slide plate and is used to mount the positioning fixture; The positioning fixture is mounted on the installation mechanism. The bottom of the positioning fixture has an opening, and the opening has a positioning ramp for positioning the prefabricated component.

2. The preform positioning device in the mold for molding aspherical glass lenses as described in claim 1, characterized in that, The positioning inclined surface is an annular conical surface.

3. The preform positioning device in the mold for molding aspherical glass lenses as described in claim 1, characterized in that, The positioning fixture is flexibly mounted on the mounting mechanism.

4. The preform positioning device in the mold for molding aspherical glass lenses as described in claim 3, characterized in that, The installation mechanism includes a mounting plate, a connector, and a first buffer component; The mounting plate has a through hole, the connector passes through the through hole and is fitted with the through hole with a clearance. The upper end of the connector is exposed on the upper surface of the mounting plate, and the lower end of the connector is exposed on the lower surface of the mounting plate. The lower end of the connector is connected to the positioning fixture. The first buffer is sleeved on the lower end of the connector and is located between the mounting plate and the positioning fixture. The first buffer applies elastic force to the positioning fixture.

5. The preform positioning device in the mold for molding aspherical glass lenses as described in claim 4, characterized in that, The mounting mechanism further includes a parallelism adjusting plate and several gap pieces. The parallelism adjusting plate is fixed on the lifting slide plate, the mounting plate is disposed on the lower surface of the parallelism adjusting plate, and the several gap pieces are disposed between the parallelism adjusting plate and the mounting plate and are respectively located at the four corners of the mounting plate.

6. The preform positioning device in the mold for molding aspherical glass lenses as described in claim 4, characterized in that, The connector includes a quick-release head and a quick-release rod. The quick-release head is located on the upper surface of the mounting plate. The quick-release rod passes through the through hole and slides with the through hole. The upper end of the quick-release rod is quickly connected to the quick-release head, and the lower end of the quick-release rod is connected to the positioning fixture.

7. The preform positioning device in a mold for molding aspherical glass lenses as described in claim 1, characterized in that, The outer diameter of the positioning fixture is adapted to the inner diameter of the mold.

8. The preform positioning device in a mold for molding aspherical glass lenses as described in claim 7, 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.

9. The preform positioning device in a mold for molding aspherical glass lenses as described in claim 1, characterized in that, The lifting drive mechanism includes a push rod, which is connected to the lifting slide plate.

10. The preform positioning device in a mold for molding aspherical glass lenses as described in claim 9, characterized in that, The lifting slide plate is provided with a connecting block, and the lifting drive mechanism also includes a floating joint, one end of which is connected to the push rod and the other end of which is connected to the connecting block.

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