Eccentrically adjustable multi-cavity plastic optical lens mold

Abstract

The utility model relates to optical lens technical field discloses eccentric adjustable multi -cavity plastic optical lens mould, including lower mould seat, be provided with four groups of mould groove in the lower mould seat, rotate and connect with outer mould in every group mould groove, the lower mould seat outside wall all welds with outer rotary seat, the outer rotary seat outside rotation is connected with outer screw handle, the outer screw handle is fixedly connected with outer mould, every group outer mould inner wall fixedly connected with inner rotary seat, the outer mould rotates and is connected with inner mould. The utility model discloses be provided with outer mould, inner mould, inner screw handle, outer screw handle, inner rotary seat and outer rotary seat, realized the precision adjustable of mould cavity in horizontal and vertical two directions, make every group lens forming position under the multi -cavity structure can be independently fine -tuning, thereby compensates the position deviation because of mould manufacturing error, thermal expansion and cold shrink or lens asymmetric structure brings to improve the forming precision of optical lens and mould adjustment flexibility, adapts more complex lens structure design.

Description

Technical Field

[0001] This utility model relates to the field of optical lens technology, specifically to an eccentric adjustable multi-cavity plastic optical lens mold. Background Technology

[0002] Plastic optical lenses are widely used in imaging, lighting, automotive HUDs, cameras, and other fields. To improve production efficiency, industrial manufacturers typically use multi-cavity injection molds to mold multiple lenses at once. However, optical lenses have extremely high requirements for molding precision, especially the optical center, shape symmetry, and thickness consistency of the lens. Even slight deviations can lead to a decrease in optical performance.

[0003] Most common optical lens injection molds currently use a fixed cavity structure. When the symmetry of the structure or the assembly precision is limited, it is difficult to independently fine-tune the position of each cavity. Once there are mold processing errors, thermal expansion and contraction deformation, or the lens itself is an eccentric / asymmetrical structure, the molding positions between the cavities may be inconsistent, affecting the alignment accuracy of the optical center.

[0004] Therefore, there is an urgent need for a multi-cavity optical lens mold with adjustable cavity eccentricity, which can finely adjust the position of each cavity in the horizontal and vertical directions, thereby improving the mold adjustment flexibility and optical forming accuracy, and adapting to more complex lens structure designs. Utility Model Content

[0005] The purpose of this invention is to provide an eccentric adjustable multi-cavity plastic optical lens mold to solve the problem mentioned in the background art of difficulty in independently fine-tuning the position of each cavity.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an eccentric adjustable multi-cavity plastic optical lens mold, comprising a lower mold base, wherein four sets of mold slots are provided in the lower mold base, and an outer mold is rotatably connected in each set of mold slots. An outer rotating seat is welded to the outer side wall of the lower mold base, and an outer rotating handle is rotatably connected to the outer rotating seat. The outer rotating handle is fixedly connected to the outer mold. An inner rotating seat is fixedly connected to the inner wall of each set of outer molds, and an inner mold is rotatably connected to the outer mold. An inner rotating handle is fixedly connected to the inner rotating seat of the inner mold, and a concave mold cavity is provided in the inner mold.

[0007] As a further technical solution of this utility model, the outer mold is provided with four sets in the lower mold base, and the lower mold base is provided with a gate in the middle position, and the gate divides into four sets of flow channels.

[0008] As a further technical solution of this utility model, the rotation directions of the outer mold and the inner mold are perpendicular.

[0009] As a further technical solution of this utility model, four sets of ring frames are welded to the outer wall of the lower mold base, and a rotating block is fixedly connected to one end of the outer rotating handle near the ring frame. The rotating block is embedded in the ring frame and rotates.

[0010] As a further technical solution of this utility model, the lower mold base is provided with four sets of cylinder slots, each set of cylinder slots corresponds to a set of outer molds, and both the outer mold and the lower mold base are provided with top slots.

[0011] As a further technical solution of this utility model, a top material cylinder is fixedly connected in the cylinder groove, and a top rod is fixedly connected to the top of the top material cylinder through a piston rod. The top rod extends through the top groove to the bottom of the inner mold.

[0012] As a further technical solution of this utility model, the top of the ejector pin is machined into an arc shape, and the ejector pin is located on one side below the inner mold.

[0013] As a further technical solution of this utility model, an upper mold base is installed on the top of the lower mold base, and guide rods are fixed on the front and rear ends of the upper mold base.

[0014] Compared with the prior art, the beneficial effects of this utility model are: by setting an outer mold, an inner mold, an inner rotating handle, an outer rotating handle, an inner rotating seat, and an outer rotating seat, the mold cavity is precisely adjustable in both the horizontal and vertical directions, so that the forming position of each group of lenses in the multi-cavity structure can be independently fine-tuned, thereby compensating for the positional deviation caused by mold manufacturing errors, thermal expansion and contraction, or asymmetrical structure of the lens, thus improving the forming accuracy of optical lenses and the flexibility of mold adjustment, and adapting to more complex lens structure designs. Attached Figure Description

[0015] Figure 1 This is a top view of the lower mold base structure of this utility model;

[0016] Figure 2 This is a frontal cross-sectional view of the present invention.

[0017] Figure 3 This is a front view structural diagram of the inner mold of this utility model;

[0018] Figure 4 This is a front view cross-sectional structural diagram of the external rotating handle of this utility model.

[0019] In the diagram: 1. Lower mold base; 2. Mold groove; 3. Outer mold; 4. Inner mold; 5. Mold cavity; 6. Inner rotating handle; 7. Inner rotating seat; 8. Outer rotating handle; 9. Outer rotating seat; 10. Upper mold base; 11. Guide rod; 12. Rotating block; 13. Ring frame; 14. Cylinder groove; 15. Ejector cylinder; 16. Ejector rod; 17. Ejector groove; 18. Gate; 19. Runner. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 An embodiment of this utility model provides an eccentric adjustable multi-cavity plastic optical lens mold, including a lower mold base 1, four sets of mold slots 2 are provided in the lower mold base 1, an outer mold 3 is rotatably connected in each set of mold slots 2, an outer rotating seat 9 is welded to the outer side wall of the lower mold base 1, an outer rotating handle 8 is rotatably connected to the outer rotating seat 9, the outer rotating handle 8 is fixedly connected to the outer mold 3, an inner rotating seat 7 is fixedly connected to the inner wall of each set of outer mold 3, an inner mold 4 is rotatably connected in the outer mold 3, an inner rotating handle 6 is fixedly connected to the inner rotating seat 7 in the inner mold 4, a concave mold cavity 5 is provided in the inner mold 4, four sets of outer mold 3 are provided in the lower mold base 1, a gate 18 is provided in the middle position of the lower mold base 1, the gate 18 divides the flow into four sets of flow channels 19, and the rotation directions of the outer mold 3 and the inner mold 4 are perpendicular.

[0022] Specifically, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the mold has four sets of mold slots 2, and each set of mold slots 2 has an outer mold 3. The outer mold 3 can be rotated and adjusted in the horizontal direction for overall eccentric positioning. Each outer mold 3 has an inner mold 4. The inner mold 4 and the outer mold 3 can rotate relative to each other in the vertical direction. The inner mold 4 is connected to the inner rotating seat 7 at its bottom through the inner rotating handle 6. The outer mold 3 is fixedly connected to the outer rotating seat 9 through the outer rotating handle 8. During operation, the outer rotating handle 8 and the inner rotating handle 6 can be rotated respectively to drive the outer mold 3 and the inner mold 4 to rotate eccentrically, so as to realize the fine position adjustment of the mold cavity 5 in the horizontal and vertical directions, thereby enabling the injection molded optical lens to have higher center alignment accuracy and adapt to asymmetric or eccentric mirror surface design.

[0023] Furthermore, the outer rotating handle 8 and the inner rotating handle 6 are respectively connected to an external drive source. The drive source can be a micro stepper motor, a servo motor, or a pneumatic rotary cylinder, which is installed on the outside of the mold and connected to the outer rotating handle 8 and the inner rotating handle 6 through a coupling. The coupling structure can adopt a cross shaft type flexible connection, with slight deviation in the rotation direction and controllable precision. The drive source is integrated with the control system and is uniformly controlled by an external PLC or control panel, so that the position of each set of outer mold 3 and inner mold 4 can be adjusted independently or in conjunction, improving the mold adjustment efficiency of the entire mold. Since the external drive source is not a specific component of this mold, it will not be described in detail here.

[0024] Four sets of ring frames 13 are welded to the outer wall of the lower mold base 1. A rotating block 12 is fixedly connected to one end of the outer rotating handle 8 near the ring frame 13. The rotating block 12 is embedded in the ring frame 13 and rotates.

[0025] Specifically, such as Figure 1 , Figure 3 and Figure 4 As shown, to ensure the stability of the outer mold 3 during the eccentric rotation adjustment process, four sets of ring frames 13 are provided on the outer wall of the mold lower mold base 1. Each set of ring frames 13 is embedded with a rotating block 12. The rotating block 12 is fixedly connected to one end of the outer rotating handle 8. When the outer rotating handle 8 rotates and drives the outer mold 3 to adjust eccentrically, the rotating block 12 slides and rotates in the ring frame 13 to play a limiting and guiding role, so as to prevent the outer rotating handle 8 from shaking or deviating during the rotation process, ensuring that the overall rotation process of the outer mold 3 is stable and smooth, improving the adjustment accuracy, and is especially suitable for lenses with high requirements for the polarization center.

[0026] The lower mold base 1 is provided with four sets of cylinder slots 14, each set of cylinder slots 14 corresponds to a set of outer molds 3. Both the outer molds 3 and the lower mold base 1 are provided with top slots 17. An ejector cylinder 15 is fixedly connected in the cylinder slots 14. An ejector rod 16 is fixedly connected to the top of the ejector cylinder 15 through a piston rod. The ejector rod 16 extends through the top slot 17 to the bottom of the inner mold 4. The top of the ejector rod 16 is machined into an arc shape. The ejector rod 16 is located on the side below the inner mold 4. An upper mold base 10 is installed on the top of the lower mold base 1. Guide rods 11 are fixed on the front and rear edges of the upper mold base 10.

[0027] Specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, in order to achieve reliable demolding of the inner mold 4 in an eccentric state, four sets of cylinder slots 14 are provided inside the lower mold base 1. Each set of cylinder slots 14 is equipped with an ejector cylinder 15. The top of the ejector cylinder 15 is fixedly connected to an ejector rod 16. The ejector rod 16 passes through the top groove 17. The inner diameter of the top groove 17 is larger than the maximum deflection radius of the inner mold 4. Even if the inner mold 4 has been eccentrically rotated during use, the ejector rod 16 can still be ejected from the top groove 17, forming a fulcrum with the inner rotating seat 7, pushing the inner mold 4 to flip upward and demold out of the mold cavity 5. The top of the ejector rod 16 is machined into an arc-shaped structure, which fits the bottom surface of the inner mold 4 to ensure uniform force and smooth movement during demolding, which helps to quickly demold products of each cavity in a multi-cavity structure.

[0028] Furthermore, the top-loading cylinder 15 includes a cylinder barrel, end cap, piston, piston rod, and seals. The solenoid valve, air pump, and air passage that are used with the cylinder are technologies known to those skilled in the art and are not improvements of this application. The improvements of this application should be the interaction relationships between the functional modules of each entity.

[0029] Working principle: First, the upper mold base 10 and the lower mold base 1 are closed. The guide rod 11 achieves precise alignment of the upper and lower molds. An outer mold 3 is installed in each mold slot 2. An inner mold 4 is rotatably connected to the outer mold 3. The inner mold 4 and the outer mold 3 are independently adjustable via an inner rotating handle 6 and an outer rotating handle 8, respectively. The outer rotating handle 8 is connected to the lower mold base 1 via an outer rotating seat 9. The outer rotating handle 8 can drive the outer mold 3 to rotate eccentrically in the horizontal direction for positioning. The inner rotating handle 6 is connected to the inner mold 4 via an inner rotating seat 7. It can drive the inner mold 4 to rotate vertically to fine-tune the cavity 5. The positioning allows for bidirectional eccentric adjustment of the mold cavity 5, thereby correcting deviations during optical lens forming and ensuring optical center accuracy. During adjustment, the outer rotating handle 8 and the inner rotating handle 6 are controlled by external drive sources, including micro stepper motors, servo motors, or pneumatic rotary cylinders. The drive sources are connected to the handles via couplings, which employ a cross-shaft flexible structure to absorb minute angular errors and maintain rotational accuracy. The external control system uses a PLC or control panel for centralized control, allowing for independent or coordinated adjustment of each set of outer molds 3 and inner molds 4. Adjustment is performed to automatically correct the eccentricity of the mold cavity 5, ensuring the dimensions during synchronous molding of the multi-cavity lens. During the eccentric rotation of the outer mold 3, the rotating block 12 at the end of the outer rotating arm 8 near the ring frame 13 slides within the ring frame 13, forming a limiting and guiding function to prevent shaking or offset during rotation, ensuring smooth and reliable rotation of the outer mold 3. After adjustment, the molten plastic flow is evenly distributed to the four sets of mold cavities 5 through the flow-dividing structure of the gate 18 and the runner 19, ensuring balanced filling of the multi-cavity injection molding. After injection molding is completed, the ejector cylinder 15 is activated, driving... The piston rod pushes the ejector rod 16 upward, and the ejector rod 16 passes through the top groove 17 and extends into the bottom of the inner mold 4. Under the fulcrum of the inner rotating seat 7, the inner mold 4 is slightly rotated in the eccentric direction to achieve smooth demolding of the molded lens. Since the inner diameter of the top groove 17 is larger than the deflection range of the inner mold 4, the inner mold 4 can be ejected smoothly even in an eccentric state. The top of the ejector rod 16 is machined into an arc surface to fit with the bottom of the inner mold 4, ensuring uniform force during the ejection process and preventing lens deformation or scratches. After demolding, the ejector cylinder 15 returns to its original position, and the mold closes again to enter the next injection cycle.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An eccentric adjustable multi-cavity plastic optical lens mold, comprising a lower mold base (1), characterized in that: The lower mold base (1) is provided with four sets of mold slots (2), and an outer mold (3) is rotatably connected in each set of mold slots (2). An outer rotating seat (9) is welded to the outer side wall of the lower mold base (1). An outer rotating handle (8) is rotatably connected to the outside of the outer rotating seat (9). The outer rotating handle (8) is fixedly connected to the outer mold (3). An inner rotating seat (7) is fixedly connected to the inner wall of each set of outer molds (3). An inner mold (4) is rotatably connected in the outer mold (3). An inner rotating handle (6) is fixedly connected to the inner rotating seat (7) in the inner mold (4). A concave mold cavity (5) is provided in the inner mold (4).

2. The eccentric adjustable multi-cavity plastic optical lens mold according to claim 1, characterized in that: The outer mold (3) has four sets of gates in the lower mold base (1). The lower mold base (1) has a gate (18) in the middle position, and the gate (18) divides the flow into four sets of flow channels (19).

3. The eccentric adjustable multi-cavity plastic optical lens mold according to claim 1, characterized in that: The outer mold (3) and the inner mold (4) rotate in directions perpendicular to each other.

4. The eccentric adjustable multi-cavity plastic optical lens mold according to claim 1, characterized in that: The lower mold base (1) has four sets of ring frames (13) welded to its outer wall. The outer rotating handle (8) is fixedly connected to a rotating block (12) at one end near the ring frame (13). The rotating block (12) is embedded in the ring frame (13) and rotates.

5. The eccentric adjustable multi-cavity plastic optical lens mold according to claim 1, characterized in that: The lower mold base (1) is provided with four sets of cylinder grooves (14), each set of cylinder grooves (14) corresponds to a set of outer molds (3), and the outer molds (3) and the lower mold base (1) are both provided with top grooves (17).

6. The eccentric adjustable multi-cavity plastic optical lens mold according to claim 5, characterized in that: A top-loading cylinder (15) is fixedly connected inside the cylinder groove (14). A top rod (16) is fixedly connected to the top of the top-loading cylinder (15) through a piston rod. The top rod (16) extends through the top groove (17) to the bottom of the inner mold (4).

7. The eccentric adjustable multi-cavity plastic optical lens mold according to claim 6, characterized in that: The top of the push rod (16) is machined into an arc shape, and the push rod (16) is located on one side below the inner mold (4).

8. The eccentric adjustable multi-cavity plastic optical lens mold according to claim 1, characterized in that: The upper mold base (10) is installed on the top of the lower mold base (1), and guide rods (11) are fixed on the front and rear ends of the upper mold base (10).

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