A waste recycling structure and an optical lens injection molding equipment

Abstract

This invention relates to the field of injection molding equipment, and discloses a waste recycling structure and an injection molding equipment for optical lenses. The key technical points are: an injection molding equipment for optical lenses, comprising: an injection platform with a lower mold on the platform and an upper mold above the lower mold; the lower mold having multiple mold openings a, and the upper mold having multiple mold openings b; and an injection box located at the bottom of the injection platform, with cavities a and b formed within the injection box, the latter used to store the melt. This invention has advantages such as strong structural linkage, high degassing efficiency, and stable molding quality. By setting up cavity b, a turntable, and degassing components, the centrifugal force generated by the rotation of the turntable actively removes air bubbles from the melt, significantly improving the purity of the raw materials and solving the problems of low passive venting efficiency and the tendency of residual air bubbles to form refractive defects in traditional molds.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment technology, specifically to a waste recycling structure and an injection molding equipment for optical lenses. Background Technology

[0002] Optical lenses are typically injection molded using high-transparency resin materials. The resin is heated and melted, then injected into a mold cavity, and after pressure holding and cooling, it is molded into the desired lens structure. Because optical lenses have extremely high requirements for transparency, surface smoothness, and refractive uniformity, any tiny air bubbles, impurities, or stress marks can lead to a decrease in optical performance.

[0003] During the injection molding stage, the generation of bubbles is mainly related to factors such as air trapped in the molten material and poor venting of the mold cavity. For example, when the resin particles are not sufficiently dried, the moisture in them will vaporize and form gas in the high-temperature molten state, resulting in tiny bubbles inside the product; at the same time, if the air in the mold cannot be expelled in time during high-speed injection filling, it will also be entrained by the molten material to form bubbles or cavities.

[0004] To address the aforementioned issues, existing technologies primarily reduce air bubbles by improving the structure of venting channels, optimizing injection molding process parameters, or increasing raw material drying efficiency, but these methods still have certain limitations. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a waste recycling structure and an optical lens injection molding equipment, aiming to alleviate the aforementioned problems to at least some extent.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] An optical lens injection molding equipment, comprising:

[0008] An injection molding platform is provided with a lower mold and an upper mold is provided above the lower mold. The lower mold has multiple mold openings a and the upper mold has multiple mold openings b.

[0009] An injection molding box is located at the bottom of the injection molding platform. Cavity a and cavity b are formed inside the injection molding box. Cavity b is used to store melt.

[0010] Multiple turntables are disposed in the cavity a, the turntables are connected to the cavity b, and the turntables are connected to the mold opening a;

[0011] Multiple drain pipes are provided on the upper mold, and the drain pipes are connected to the mold opening b;

[0012] A defoaming component located between the injection molding box and the turntable is used to rotate the turntable when the melt enters the turntable, and use centrifugal force to discharge the air bubbles to the inner wall of the turntable;

[0013] A degassing component located between the injection molding box and the upper mold is used to inject air into the drain pipe when the turntable rotates.

[0014] Preferably, the cavity a is provided with a flow divider pipe, the flow divider pipe is connected to the mold opening a, and the mold opening a is provided with a valve needle.

[0015] Preferably, the cavity b is connected to a connecting pipe a, the top of the connecting pipe a extends upward into the turntable and communicates with the turntable, the connecting pipe a and the turntable are connected by a fixed method, the bottom of the diversion pipe is connected to a connecting pipe b, and the bottom of the connecting pipe b is rotatably connected to the turntable.

[0016] Preferably, the defoaming component includes a motor connected to the bottom of the injection molding platform, and a chain drive mechanism is provided between the drive shaft of the motor and an adjacent connecting pipe a, and a chain drive mechanism is also provided between every two adjacent connecting pipes a.

[0017] Preferably, the upper mold has a connecting channel, the drain pipe is connected to the connecting channel, the connecting channel and the mold opening b are connected by a connecting pipe c, a piston a is slidably connected inside the connecting pipe c, a spring a is connected between the piston a and the connecting pipe c, and an overflow port is opened on the connecting pipe c, located above the piston a.

[0018] Preferably, a disturbance strip a is fixed to the top of the turntable, a spring telescopic rod is connected to the bottom of the diverter, a disturbance strip b is fixed to the telescopic shaft of the spring telescopic rod, and a connecting rod is connected to the top of the diverter.

[0019] Preferably, the defoaming component includes a sleeve connected to one of the upper molds in the middle. The bottom of the sleeve has a communication port that communicates with the connecting channel. A piston b is slidably connected inside the sleeve. A spring b is connected between the piston b and the sleeve. Two stacked elastic plates are provided in the communication port. A sliding rod is slidably connected to the upper mold. The sliding rod extends into the sleeve and is rotatably connected to a connecting rod. The other end of the connecting rod is rotatably connected to the piston b. An air port corresponding to the position of the piston b is provided on the sleeve.

[0020] Preferably, the defoaming component further includes a plurality of bosses connected to the outer wall of the turntable, a connecting plate slidably connected to the injection molding platform, the bottom of the connecting plate extending into the cavity a, a spring c connecting the connecting plate and the injection molding platform, a protruding rod corresponding to the boss connected to one side of the connecting plate, and a sliding rod slidably connected to the connecting plate.

[0021] A waste recycling structure, applicable to any of the above-mentioned optical lens injection molding equipment, includes a cavity c disposed in the injection molding box, a telescopic tube communicating with the cavity c through a connecting channel, the fixed end of the telescopic tube being fixed to the injection molding box and extending to the top of the injection molding platform, and the movable end of the telescopic tube being fixed to the connecting channel.

[0022] In summary, the present invention has the following main beneficial effects:

[0023] This invention boasts advantages such as strong structural linkage, high degassing efficiency, and stable molding quality. By incorporating cavity b, a turntable, and degassing components, the centrifugal force generated by the turntable's rotation actively removes air bubbles from the melt, significantly improving raw material purity and solving the problems of low passive venting efficiency and refractive defects caused by residual air bubbles in traditional molds. Simultaneously, a drain pipe is installed at the top of the mold cavity, working in conjunction with a controllable air intake and degassing structure to assist in the removal of residual air bubbles and excess melt as the mold cavity nears full, further enhancing the optical consistency and edge cleanliness of the molded parts.

[0024] Furthermore, by forming an intermittent mechanical linkage structure between the bosses on the outer wall of the turntable and the connecting plate on the injection platform, the degassing action is highly synchronized with the injection cycle, avoiding melt disturbance or energy waste caused by continuous air intake. This structure relies on the periodic triggering of the slide rod displacement during the turntable rotation to drive the piston to open the air intake path, ensuring that gas is injected only at critical nodes when the mold cavity is close to saturation, forming a pulsed air pressure drive. This not only enhances the degassing driving force but also avoids the risk of air pressure overload in the upper part of the mold, improving degassing accuracy and process stability. Excess melt and bubbles discharged are guided through a flexible telescopic tube into cavity c inside the injection box, forming a closed waste recycling path. This effectively prevents material condensation from clogging the mold or contaminating the work area, improving equipment cleanliness and operational continuity, and meeting the high cleanliness requirements of optical product manufacturing. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a cross-sectional schematic diagram of the overall structure of the present invention;

[0027] Figure 3 This is a structural diagram of the present invention after concealing the injection molding platform and the injection molding box;

[0028] Figure 4 This is a cross-sectional schematic diagram of the upper mold structure of the present invention;

[0029] Figure 5 This is a cross-sectional schematic diagram of the lower mold structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the disturbance strip a and disturbance strip b of the present invention.

[0031] Figure label:

[0032] 100. Injection molding platform; 101. Lower mold; 102. Upper mold; 103. Mold opening a; 104. Mold opening b; 105. Injection molding box; 106. Cavity a; 107. Cavity b; 108. Turntable; 109. Drain pipe;

[0033] 200. Diverter pipe; 201. Valve needle; 202. Connecting pipe a; 203. Connecting pipe b; 204. Motor; 205. Chain drive mechanism;

[0034] 300. Connecting channel; 301. Connecting pipe c; 302. Piston a; 303. Spring a; 304. Overflow outlet; 305. Disturbance bar a; 306. Spring telescopic rod; 307. Disturbance bar b; 308. Connecting rod;

[0035] 400. Sleeve; 401. Connecting port; 402. Piston b; 403. Spring b; 404. Elastic plate; 405. Slide rod; 406. Connecting rod; 407. Air port; 408. Boss; 409. Connecting plate; 410. Spring c; 411. Protruding rod;

[0036] 500, cavity c; 501, telescopic tube. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Example 1

[0039] refer to Figures 1-6An optical lens injection molding equipment includes an injection platform 100, on which an upper mold 102 and a lower mold 101 are fitted together. The lower mold 101 is provided with a plurality of mold openings a103, and the upper mold 102 is provided with a plurality of mold openings b104 at corresponding positions. The mold openings a103 and b104 form a melt forming cavity relative to each other in the mold closed state.

[0040] The injection molding platform 100 has an injection molding box 105 at its bottom. The injection molding box 105 has two cavities: cavity a106 for transfer and cavity b107 for storing the melt. When the equipment is running, the molten resin material first enters the storage cavity b107 within the injection molding box 105 and is temporarily stored there. As the melt gradually accumulates to a set threshold, under the upward pressure of the melt, a portion of the melt is pushed upwards from cavity b107 and sequentially introduced into multiple turntables 108 located inside cavity a106.

[0041] Each turntable 108 is connected to the cavity b107 and the mold opening a103, allowing the melt to be further injected into the lower mold 101 via the turntable 108. To reduce air bubbles in the melt, as the melt flows into the turntable 108, a defoaming component located between the injection molding box 105 and the turntable 108 drives the turntable 108 to rotate at high speed. This causes the melt within the turntable 108 to throw the internal air bubbles towards the inner wall of the turntable 108 under centrifugal force, thereby significantly reducing the air bubble content in the central area of ​​the turntable 108.

[0042] During the continuous rotation and injection process of turntable 108, most of the melt that has been expelled by bubbles will enter the mold opening a103. As the mold cavity gradually fills and the melt is continuously supplied, some of the excess melt will naturally be discharged along the multiple drain pipes 109 in the upper mold 102.

[0043] To prevent the melt in these drain pipes 109 from solidifying and clogging due to cooling, air is injected into the drain pipes 109 by a de-foaming component located between the injection molding box 105 and the upper mold 102 during the rotation of the turntable 108. This forms an auxiliary exhaust airflow, which helps to smoothly carry the overflowing melt out of the mold structure from the drain pipes 109, thereby avoiding melt retention and solidification and improving the continuous injection efficiency of the equipment.

[0044] With the above configuration, the injection molding platform 100 serves as the main mounting base of the equipment, supporting the precise positioning and closing operations of the upper mold 102 and the lower mold 101. The lower mold 101 and the upper mold 102 are respectively provided with multiple mold openings a103 and b104, forming a set of corresponding closed mold cavities in the mold-closed state to receive molten resin and mold it into optical lenses. This structure enables simultaneous molding of multiple cavities, improving production efficiency. Furthermore, the corresponding openings of the upper and lower molds 101 help ensure uniform melt filling, reducing the risk of flow deviation and uneven thickness, thereby improving the dimensional accuracy and optical consistency of the optical lenses.

[0045] In the initial stage of equipment operation, molten resin material is introduced into the injection molding box 105 through the feed end and first enters the storage cavity b107 for buffering and accumulation. As the melt gradually increases, under the combined effect of its own gravity and the pressure from below, the melt is pushed upward from the cavity b107 into the multiple turntables 108 structure located in the cavity a106. After the molten resin material is stored in the cavity b107 to form a stable liquid level, driven by the supply pressure, the melt flows upward in a continuous and stable manner into the cavity a106 and is introduced into the turntables 108. Compared with the complex flow patterns such as melt backflow, pushing, and breakage and reconnection commonly found in traditional "top-in, bottom-out" or "lateral advancement" structures, this "bottom-up" injection path forms a uniform axial flow in the initial stage of flow, avoiding interference from high-pressure sudden changes or reverse disturbances on the flow field.

[0046] After the melt enters the turntable 108, the turntable 108 rotates at high speed driven by the defoaming component. Utilizing the centrifugal force generated by the rotation, the air bubbles originally entrained in the melt are thrown towards the inner wall of the turntable 108, thus significantly reducing the air bubble content in the central region of the turntable 108. Compared to traditional mold degassing methods that rely on venting grooves, this process has a more proactive and thorough air bubble removal effect, making it particularly suitable for applications such as optical lenses that require extremely high transparency and air bubble-free properties, effectively improving the yield of finished products.

[0047] After centrifugal purification, the melt is further injected by turntable 108 into the cavity formed by the merging of mold openings a103 and b104, completing the main molding process. When the mold cavity is nearly saturated or the melt is slightly excessive, the multiple drain pipes 109 provided in the upper mold 102 form an upward channel, allowing some of the excess melt, along with any tiny air bubbles that may remain in the mold cavity, to rise naturally and overflow from the mold. This overflow path not only regulates the injection volume and prevents excessive pressure in the mold cavity, but also removes air bubbles that may remain on the surface or edge of the melt at the end of the molding process, further reducing the risk of residual air bubbles inside the mold cavity. Especially in the later stages of molding, although the mainstream melt has been degassed by turntable 108, due to the complex structure of the mold cavity edge or the presence of a temperature gradient on the mold surface, a very small number of microbubbles may still adhere to the filling front or float to the surface. If not removed in time, these microbubbles will form abnormal refraction or surface defects during the cooling process. This structure keeps the rising channel unobstructed by setting up a drain pipe 109, so that these bubbles are carried into the drain pipe 109 by the overflowing melt during the process of the melt rising, thereby achieving "secondary removal" of residual bubbles.

[0048] During the draining process, to prevent solidification and blockage of the drain pipe 109 due to molten residue during the cooling stage, a defoaming component is installed to inject air into the drain pipe 109 while the turntable 108 rotates. This airflow can form a weak but continuous outward airflow pressure, helping to smoothly carry the overflowing melt out of the draining channel, thereby avoiding blockage of the upper channel of the mold, ensuring continuous and stable operation of the equipment, and improving the mold reuse efficiency.

[0049] In this embodiment, to control the flow of melt into the mold, multiple diversion pipes 200 are provided within the cavity a106, each diversion pipe 200 being connected to a corresponding mold opening a103. The diversion pipes 200 guide the degassed melt from the central region into the diversion pipes 200. At the end of the diversion path, i.e., inside the mold opening a103, a valve needle 201 structure is provided. The valve needle 201 can be switched on and off at different stages of the injection molding process, depending on conditions such as injection pressure and mold cavity filling status. The valve needle 201 structure located within the mold opening a103 plays a crucial role in flow regulation and on / off control throughout the entire injection molding process. In the initial stage of injection molding, when the mold is not yet closed or the pressure is insufficient, the valve needle 201 remains closed to prevent premature melt flow, which could cause partial solidification of the mold cavity, bubble retention, and other molding defects. Once the mold is closed and the pressure meets the set conditions, the valve needle 201 opens, allowing the high-quality degassed melt to be precisely injected into the mold cavity, ensuring optimal melt quality in the initial injection stage. Furthermore, in the later stages of injection molding or when the mold cavity is nearly saturated, the valve needle 201 can be closed again under the action of the control system to avoid problems such as flash and overflow caused by overfilling of the melt. It should be noted that the structure of the valve needle 201 can adopt the mature direct-acting or guided valve needle 201 components in the prior art, and its opening and closing method can be mechanical, electromagnetic or pneumatic control. The specific structure and control method are not the focus of the present invention, and the present invention does not limit the structure of the valve needle 201 body.

[0050] In this embodiment, to ensure the stable introduction of the melt into the turntable 108 from the cavity b107 while satisfying the structural degrees of freedom required for the rotation of the turntable 108, a connecting pipe a202 is provided above the cavity b107. The top of the connecting pipe a202 extends upward and penetrates into the turntable 108, communicating with it. The connecting pipe a202 and the turntable 108 form a stable melt rising channel through a fixed connection, used to guide the melt in the cavity b107 axially into the turntable 108.

[0051] Meanwhile, a connecting pipe b203 is provided at the bottom of the diversion pipe 200. The bottom end of the connecting pipe b203 is rotatably connected to the turntable 108, enabling relative rotation between the diversion pipe 200 and the turntable 108. This structure ensures that the diversion pipe 200 remains stationary while the turntable 108 rotates.

[0052] With the above configuration, one end of the connecting pipe a202 is fixed above the cavity b107, and the other end is inserted into and fixedly connected to the feed port of the turntable 108 to form a stable upward channel for the melt. When the turntable 108 is not rotating, the melt can flow naturally into the central area of ​​the turntable 108 along the connecting pipe a202, maintaining a stable feeding state.

[0053] During the rotation of the turntable 108, since the connecting pipe a202 is fixedly connected to the turntable 108, the turntable 108 can rotate around the axis of the connecting pipe a202, so that the turntable 108 body rotates at high speed while the melt enters the turntable 108. This "center fixed + outer ring rotating" structure ensures the synergy between the continuous feeding and the centrifugal degassing efficiency, and avoids leakage or disturbance caused by loose rotating parts.

[0054] On the other hand, the discharge end of the turntable 108 is connected to the diverter pipe 200 via a connecting pipe b203. The lower end of the connecting pipe b203 is rotatably connected to the turntable 108, allowing the connecting pipe b203 to rotate along with the turntable 108, while the diverter pipe 200 at its upper end remains stationary. This structural design allows the high-quality melt inside the turntable 108 to be smoothly discharged during rotation, avoiding fluid disturbances caused by pipe kinking, shearing, or pulling, while ensuring the stability and flow field integrity of the melt after degassing during transmission.

[0055] In this embodiment, the defoaming component includes a motor 204, which is fixedly installed at the bottom of the injection molding platform 100, and its drive shaft is connected to an adjacent connecting pipe a202 through a chain transmission mechanism 205.

[0056] To ensure the coordinated operation of multiple turntables 108, a chain drive mechanism 205 is also provided between every two adjacent connecting pipes a202, forming a continuous linkage. This structure allows multiple turntables 108 to rotate synchronously with only one motor 204, achieving consistent degassing operation during multi-cavity parallel injection molding.

[0057] With the above configuration, the motor 204 located at the bottom of the injection molding platform 100 serves as a unified power source for multiple turntables 108. The drive shaft of the motor 204 is connected to a connecting pipe a202 via a chain transmission mechanism 205, thereby driving the turntable 108 fixedly connected to the connecting pipe a202 to begin rotating. Since chain transmission structures are also provided between all adjacent connecting pipes a202, a "series linkage" is formed between the turntables 108, achieving synchronous rotation of the entire set of turntables 108.

[0058] In this embodiment, in order to improve the adaptability and stability of the melt discharge process in the upper mold 102, a connecting channel 300 is provided on the upper mold 102, and multiple drain pipes 109 are connected to the connecting channel 300 to uniformly discharge excess melt in the mold cavity.

[0059] The connecting channel 300 is connected to the mold opening b104 via a connecting pipe c301. A piston a302 is slidably connected inside the connecting pipe c301 to adjust the flow path of the melt under different pressure conditions. A spring a303 is provided between the piston a302 and the connecting pipe c301 to maintain the piston in its initial position when there is no external force. An overflow port 304 is provided at the upper part of the connecting pipe c301, located above the piston a302, to discharge excess melt when the piston moves to a specific position.

[0060] With the above settings, during the injection molding process, when the degassed melt enters the mold cavity from the rotating disk 108 through the mold openings a103 and b104 and gradually fills the mold cavity, a small amount of excess melt is generated due to factors such as a slightly larger supply. At this time, some melt will enter the connecting pipe c301 through the mold opening b104 and apply upward pressure to the piston a302 therein. When the melt pressure is less than the preload of the spring a303, the piston remains in the initial position, and the connecting channel 300 remains closed; when the melt pressure continues to increase to exceed the set value of the spring a303, the piston a302 moves upward under the push of the fluid, gradually opening the overflow port 304 set above the connecting pipe c301, so that the excess melt is automatically discharged along the overflow port 304.

[0061] After the pressure stops, since the melt no longer exerts upward force on the piston a302, the spring a303 gradually returns to its original deformation state, pushing the piston a302 back to its initial position. As the piston a302 falls back to its initial position, its lower end re-closes the passage between the connecting pipe c301 and the overflow port 304, thereby keeping the melt discharge channel closed and preventing external air from flowing back or residual melt from flowing back into the mold cavity.

[0062] In this embodiment, to achieve mechanical periodic disturbance during injection molding and enhance bubble removal and local desorption effects, a disturbance strip a305 is fixedly installed on the top of the turntable 108. The disturbance strip a305 is rigidly connected to the turntable 108 and rotates around the central axis as the turntable 108 rotates. A disturbance strip b307 is fixed to the bottom of the diverter pipe 200 by a spring telescopic rod 306.

[0063] With the above configuration, in this embodiment, a disturbance strip a305 is fixedly installed on the top of the turntable 108. As the turntable 108 rotates, the disturbance strip a305 runs periodically along a circular trajectory. When the disturbance strip a305 rotates to a specific angle, its protrusion will intermittently make mechanical contact with the disturbance strip b307 located below the diverter 200, thereby generating a momentary impact force on the disturbance strip b307.

[0064] The disturbance strip b307 is fixed on the telescopic shaft of the spring telescopic rod 306. After being impacted, it moves downward for a short time. After the disturbance strip a305 moves away, the spring telescopic rod 306 drives the disturbance strip b307 to quickly rebound and reset. This impact process generates mechanical vibration in the vertical direction, which can be transmitted to the body of the diverter pipe 200 and to the lower mold 101 area through the connecting rod 308.

[0065] Since the vibration is a local pulse-type disturbance that is mechanically triggered by the rotating turntable 108 and released periodically by the structure, it can cause micro bubbles to peel off from the manifold 200 or the corner of the mold and float up to the drain channel along the fluid during the critical stage of the injection molding process. At the same time, it can alleviate the problem of "dead corner bubbles" caused by structural corners, flow channel bends, etc., thereby further improving the degassing efficiency and melt uniformity in the injection molding process.

[0066] In this embodiment, the defoaming component includes a sleeve 400 connected to an upper mold 102 in the middle. The bottom of the sleeve 400 is provided with a communication port 401 that communicates with the connecting channel 300. Two elastic sheets 404 stacked one above the other are provided in the communication port 401 for one-way sealing.

[0067] A piston b402 is slidably connected inside the sleeve 400. A spring b403 is provided between the piston b402 and the sleeve 400. The spring b403 is used to hold the piston b402 in its initial position when there is no external excitation. To achieve mechanical linkage control, a slide rod 405 is slidably connected to the upper mold 102. The slide rod 405 extends into the sleeve 400 and is connected to a connecting rod 406 by a rotatable connection. The other end of the connecting rod 406 is then rotatably connected to the piston b402, which is used to transmit the displacement of the slide rod 405 to the piston to achieve mechanism control.

[0068] Furthermore, the sleeve 400 has an air port 407 on its side wall. The air port 407 is connected to the outside. The position of the air port 407 corresponds to the upper middle region of the piston b402. The piston b402 only passes through the air port 407 channel when it moves to a specific position driven by the slide rod 405.

[0069] With the above settings, during the injection molding process, when the defoaming opportunity arrives, for example, when the mold cavity is basically filled with melt and degassing begins, the slide rod 405 is controlled to translate while the turntable 108 rotates. Under the action of external force, the slide rod 405 slides along the upper mold 102 and drives the piston b402 to undergo axial displacement through the rotating connecting rod 406. As the slide rod 405 continues to move downward, the connecting rod 406 transmits the motion to the piston b402, causing it to gradually move downward and overcome the preload force of the spring b403.

[0070] When piston b402 moves down to the set height, its top just passes the air port 407, creating a closed space at the bottom of sleeve 400. At this time, the gas continuously injected into the middle region of sleeve 400 by external air source through air port 407 is trapped in the space below piston b402 and is compressed and pressurized as the piston continues to move down, forming a downward driving air pressure. Under the push of this air pressure, the two stacked elastic plates 404 in the connecting port 401 open, and the gas enters the connecting channel 300 through the connecting port 401, thereby pushing the melt and foam in the drain pipe 109 out of the mold, effectively realizing the defoaming function.

[0071] When the slide bar 405 begins to slide back to its original position, the piston b402 gradually returns to its initial position under the elastic force of the spring b403. When the piston b402 moves up to the preset height, its top reaches the air port 407, allowing external gas to enter the space below the sleeve 400. The two elastic plates 404 inside the connecting port 401 automatically reset and close due to their structural elasticity without air pressure, thus resealing the connecting channel and preventing melt or gas in the mold cavity from flowing back into the sleeve 400 system, ensuring the unidirectional control stability of the defoaming system.

[0072] Throughout the entire defoaming cycle, the sliding rod 405 drives the connecting rod 406 to achieve mechanical opening and closing action, which can generate controllable airflow driving force at key defoaming nodes to assist the smooth discharge of melt in the upper part of the mold cavity and avoid the problem of bubble retention caused by uneven pressure or mold temperature difference; the one-way valve structure composed of elastic sheet 404 ensures that the system automatically locks after defoaming to prevent molding interference or material contamination.

[0073] In this embodiment, to achieve periodic opening and closing control of the slide bar 405 during the defoaming process, the defoaming component further includes a set of auxiliary linkage mechanisms. Specifically, the outer wall of the turntable 108 is provided with a plurality of protrusions 408 arranged at intervals along the circumferential direction. Each protrusion 408 is fixedly connected to the outer periphery of the turntable 108 and is used to trigger the response of the external mechanism during the rotation of the turntable 108.

[0074] A connecting plate 409 is slidably connected to the injection molding platform 100. The bottom of the connecting plate 409 extends into the cavity a106, and one side of it is connected to the injection molding platform 100 via a spring c410 to provide a return force and maintain its initial position in a undisturbed state. A plurality of protrusions 411 are connected to one side of the connecting plate 409, and the axial position of each protrusion 411 corresponds to the boss 408 on the turntable 108.

[0075] The slide bar 405 is slidably connected to the connecting plate 409, and the synchronous displacement control of the slide bar 405 is achieved by the horizontal movement of the connecting plate 409.

[0076] With the above settings, during equipment operation, when the mold is closed and enters the injection molding stage, the slide bar 405 moves downward with the upper mold 102 and remains at a preset height, in a linkage state. At this time, the turntable 108 starts to rotate at high speed under the drive of the motor 204 and chain, and the multiple bosses 408 set on its outer periphery move in a circular trajectory with the turntable 108.

[0077] When a protrusion 408 moves to a position coinciding with the corresponding protrusion 411, it will cause a mechanical impact on the protrusion 411, which will cause the connecting plate 409 connected to it to undergo instantaneous displacement in the horizontal direction. Since the slide rod 405 is slidably connected to the connecting plate 409, the horizontal movement of the connecting plate 409 will drive the slide rod 405 to slide synchronously in the horizontal direction.

[0078] The sliding process further drives the piston b402 to undergo axial displacement via the connecting rod 406 structure, causing it to move from its initial position to a working position beyond the vent 407 on the side wall of the sleeve 400. After the piston reaches its maximum stroke, the gas is released into the connecting channel 300 through the connecting port 401 at the bottom of the sleeve 400. The released gas effectively pushes excess melt in the upper connecting channel 300 and drain pipe 109 of the mold, along with residual bubbles, out of the mold, achieving a highly efficient defoaming effect.

[0079] A waste recycling structure, applicable to any of the above-mentioned optical lens injection molding equipment, includes a cavity c500 disposed in an injection molding box 105, a telescopic tube 501 communicating between a connecting channel 300 and the cavity c500, the fixed end of the telescopic tube 501 being fixed to the injection molding box 105 and extending to the top of the injection molding platform 100, and the movable end of the telescopic tube 501 being fixed to the connecting channel 300;

[0080] In this embodiment, the telescopic tube 501 is used to achieve dynamic communication between the connecting channel 300 and the cavity c500 during equipment operation. The fixed end of the telescopic tube 501 is firmly installed on the injection molding box 105, and its movable end is connected to the connecting channel 300, so that when the upper mold 102 moves up and down, the telescopic tube 501 can be stretched or compressed accordingly, always ensuring that the air-liquid flow between the connecting channel 300 and the cavity c500 is not interrupted or twisted.

[0081] With the above structural design, during injection molding or degassing, cavity C500 serves as a specially designed waste buffer and recycling chamber, temporarily accommodating intermittently discharged waste melt and bubbles, and allowing for subsequent extraction, cleaning, or reuse.

[0082] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0083] Example 2

[0084] This embodiment optimizes the parameters based on embodiment 1 by grouping and limiting the geometric dimensions, angles and proportions of the turntable, diversion and connecting pipes, upper mold connection channel and drain pipe, threshold overflow trigger and follow-up recovery path, thereby reducing microbubbles entrained in the melt, suppressing condensation and blockage in the drain pipe section, and improving the consistency of optical components.

[0085] The inner diameter da of the connecting pipe a from cavity b to the turntable is selected as 6-8 mm, and the inner diameter db of the connecting pipe b from the branch pipe to the turntable is selected as 8-10 mm, preferably db / da = 1.25 ± 0.10; the outer diameter Dd of the turntable is 140-160 mm, and the thickness h is 8-10 mm; 8-12 disturbance strips are evenly distributed on the upper surface of the turntable, with a strip height δ of 1.0-1.5 mm and a corner radius r of 0.3-0.5 mm. The specified ratio forms a gentle pressure drop in the injection feedforward section, suppressing local shear peaks and secondary gasification at the inlet; the equivalent centrifugal acceleration ac = ω²R generated by the turntable under the action of angular velocity ω can overcome the Laplace pressure difference ΔP≈2σ / rb for microbubbles with radius r_b≤50 μm, causing the microbubbles to migrate radially outward and be thrown away from the central flow channel, thereby improving the purity of the feed from the source.

[0086] The rotary table speed is controlled in two stages: a pre-degassing stage (n1) of 1000-1200 rpm, lasting 3-6 seconds; and a subsequent steady-feed stage (n2) of 700-900 rpm until the mold cavity is nearly saturated. This timing sequence, combined with the constant values ​​of db / da, forms a flow pattern sequence characterized by low shear penetration, high centrifugal stripping, and stable feed, balancing degassing efficiency with stable material supply.

[0087] The transition section from the end of the manifold to the mold opening a is equipped with an inner edge radius R = 0.6-0.8 mm and a transition half-cone angle α = 6°-10° to suppress jet rewinding and local separation, so that the melt in the central area after degassing can enter the valve needle seat axially and stably, smooth the flow rise edge of the initial opening section of the valve needle, and reduce the risk of initial stress birefringence.

[0088] The drain pipe has an inner diameter dp of 3.0-3.5 mm and a wall thickness t of 1.0-1.2 mm; the drain pipe axis is tilted at an angle β of 12°-18° relative to the vertical direction. A step transition is provided above the overflow outlet in the connecting channel, with a step depth s of 0.4-0.6 mm. β and s form a composite capillary threshold, which can inhibit the backflow of cold material along the upper wall and prevent the formation of solidification plugs during injection and shutdown cooling stages, thus improving liquid carrying efficiency and flowability.

[0089] The piston a / spring a inside the connecting pipe c maintains its original configuration, only limiting the pre-compression amount ΔL1 to 0.8-1.2 mm and the spring stiffness k1=18-24 N / mm, corresponding to the overflow trigger pressure differential window ΔP1=0.02-0.05 MPa, so that the overflow is selectively opened only when the mold cavity is close to saturation, which not only pushes the edge trapped air and excess melt out of the mold, but also avoids excessive disturbance to the main runner, thus taking into account both the consistency of the forming surface and the dimensional accuracy.

[0090] The parameters of the sleeve / piston b / spring b / air port are: spring b stiffness k2 = 6-9 N / mm, piston b stroke S = 1.4-1.6 mm, air port diameter φv = 0.6-0.8 mm; the height of the boss on the outer wall of the turntable h_t = 1.8-2.2 mm; a spring c is installed between the injection platform and the connecting plate, with a preload F0 = 12-16 N. The mechanical cycle of the boss, connecting plate, slide rod, connecting rod, and piston b generates 2-3 pulse air intakes per revolution, with a single pulse duration τ = 120-180 ms and a pulse air flow rate of:

[0091]

[0092] Constrained by the interaction of φv, k2, ht and F0, it is confined to a narrow window that carries out the overflow without causing it to roll back. Together with β and s, it establishes a stable state with micro-positive pressure and outward migration of the film in the drain pipe, which significantly reduces the probability of condensation blockage.

[0093] The closed recovery path uses a telescopic tube with an inner diameter ds = 5.0-6.0 mm, a wall thickness ts = 1.2-1.6 mm, and an effective stroke Ls = 35-55 mm. The material is Shore A 80-85 heat-resistant elastomer, with chamfers of 30°-45° at the upper and lower ends. These parameters ensure sufficient resilience and resistance to flexural fatigue even at high temperatures, allowing for smooth expansion and contraction with the upper mold movement, avoiding dead zones, and matching the instantaneous flow rate of the pulsed liquid-carrying process to ensure a continuous and clean recovery path.

[0094] The coupling between db / da and the rotational speed timing determines the inlet shear spectrum and centrifugal migration efficiency;

[0095] The coupling of ΔP1 with the flow resistance at the end of the valve needle ensures that the overflow triggering timing is consistent with the cavity filling stage;

[0096] The coupling of β, s and Qg / τ forms a dual threshold of capillary and pressure within the drain pipe, achieving a balance between liquid carrying and disturbance suppression.

[0097] The matching of ds, ts, and Ls ensures dynamic sealing and low retention. The above linkage simultaneously reduces the microbubble retention rate, the risk of channel blockage, and the risk of edge flash, thereby improving the transmission uniformity of optical lenses and the consistency of finished products.

[0098] Without altering the component composition, the aforementioned dimensions, angles, and proportions can be engineered and calibrated within ±10%-20% based on material viscosity, injection pressure, and mold temperature. Cross-material adaptation can be achieved through grouped fine-tuning of db / da, n1 / n2, ΔP1, and φv. All equivalent substitutions and variations thereof should fall within the scope of this application.

Claims

1. An optical lens injection molding equipment, characterized in that, include: Injection platform (100), the injection platform (100) is provided with a lower mold (101), an upper mold (102) is provided above the lower mold (101), the lower mold (101) is provided with a plurality of mold openings a (103), and the upper mold (102) is provided with a plurality of mold openings b (104). An injection molding box (105) is provided at the bottom of the injection molding platform (100). Cavity a (106) and cavity b (107) are formed inside the injection molding box (105). Cavity b (107) is used to store melt. A plurality of turntables (108) are provided in the cavity a (106), the turntables (108) are connected to the cavity b (107), and the turntables (108) are connected to the mold opening a (103); A plurality of drain pipes (109) are provided on the upper mold (102), and the drain pipes (109) are connected to the mold opening b (104); A defoaming component located between the injection molding box (105) and the turntable (108) is used to rotate the turntable (108) when the melt enters the turntable (108) and use centrifugal force to discharge the bubbles to the inner wall of the turntable (108); A degassing component located between the injection molding box (105) and the upper mold (102) is used to inject air into the drain pipe (109) when the turntable (108) rotates; The upper mold (102) is provided with a connecting channel (300), the drain pipe (109) is connected to the connecting channel (300), the connecting channel (300) and the mold opening b (104) are connected by a connecting pipe c (301), a piston a (302) is slidably connected in the connecting pipe c (301), a spring a (303) is connected between the piston a (302) and the connecting pipe c (301), and an overflow port (304) is provided on the connecting pipe c (301) above the piston a (302); The defoaming component includes a sleeve (400) connected to an upper mold (102) in the middle. The bottom of the sleeve (400) is provided with a communication port (401) communicating with the connecting channel (300). A piston b (402) is slidably connected inside the sleeve (400). A spring b (403) is connected between the piston b (402) and the sleeve (400). Two stacked elastic plates (404) are provided inside the communication port (401). A sliding rod (405) is slidably connected to the upper mold (102). The sliding rod (405) extends into the sleeve (400) and is rotatably connected to a connecting rod (406). The other end of the connecting rod (406) is rotatably connected to the piston b (402). An air port (407) corresponding to the position of the piston b (407) is provided on the sleeve (400). The defoaming component also includes a plurality of bosses (408) connected to the outer wall of the turntable (108), a connecting plate (409) is slidably connected to the injection platform (100), the bottom of the connecting plate (409) extends into the cavity a (106), a spring c (410) is connected between the connecting plate (409) and the injection platform (100), a protruding rod (411) corresponding to the bosses (408) is connected to one side of the connecting plate (409), and a sliding rod (405) is slidably connected to the connecting plate (409).

2. The optical lens injection molding equipment according to claim 1, characterized in that, The cavity a (106) is provided with a flow divider (200), which is connected to the mold opening a (103). The mold opening a (103) is provided with a valve needle (201).

3. The optical lens injection molding equipment according to claim 2, characterized in that, The cavity b (107) is connected to a connecting pipe a (202), the top of the connecting pipe a (202) extends upward into the turntable (108) and communicates with the turntable (108). The connecting pipe a (202) and the turntable (108) are connected in a fixed manner. The bottom of the diversion pipe (200) is connected to a connecting pipe b (203), and the bottom of the connecting pipe b (203) is rotatably connected to the turntable (108).

4. The optical lens injection molding equipment according to claim 3, characterized in that, The defoaming component includes a motor (204) connected to the bottom of the injection molding platform (100). A chain drive mechanism (205) is provided between the drive shaft of the motor (204) and an adjacent connecting pipe a (202). A chain drive mechanism (205) is also provided between every two adjacent connecting pipes a (202).

5. The optical lens injection molding equipment according to claim 2, characterized in that, The top of the turntable (108) is fixed with a disturbance strip a (305), the bottom of the diversion pipe (200) is connected with a spring telescopic rod (306), the telescopic shaft of the spring telescopic rod (306) is fixed with a disturbance strip b (307), and the top of the diversion pipe (200) is connected with a connecting rod (308).

6. A waste recycling structure, applicable to the optical lens injection molding equipment according to any one of claims 1-5, characterized in that, Includes a cavity c (500) located inside the injection molding box (105), and a telescopic tube (501) connecting the connecting channel (300) and the cavity c (500). The fixed end of the telescopic tube (501) is fixed to the injection molding box (105) and extends to the top of the injection molding platform (100). The movable end of the telescopic tube (501) is fixed to the connecting channel (300).

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