High-precision optical lens upper and lower cover pressing tooling equipment

Abstract

The utility model relates to a kind of high-precision optical lens upper and lower cover compression tooling equipment, belong to optical device manufacturing equipment technical field. Mainly including base, lifting pressure head subassembly, stage subassembly, annular flexible limit baffle ring and mechanical linkage retraction mechanism. Stage subassembly is fixed on base, and stage body top is equipped with positioning recess and annular mounting groove. Annular flexible limit baffle ring is embedded in annular mounting groove, and it is opened under normal state. Lifting pressure head subassembly is installed on the top of base by vertical guide frame, and lower end is equipped with pressure plate. Mechanical linkage retraction mechanism includes inclined wedge block, radial slider and reset tension spring, realize the radial contraction of annular flexible limit baffle ring when pressure head is pressed down, prevent lateral deviation. The utility model solves the technical problems that lens body occurs lateral displacement or inclination in compression process due to lack of dynamic radial constraint in existing compression tooling, and rigid clamping mechanism is easily damaged lens surface, improves product coaxial precision and yield.

Description

Technical Field

[0001] This utility model belongs to the technical field of optical device manufacturing equipment, specifically relating to a high-precision optical lens upper and lower cover pressing tooling equipment. Background Technology

[0002] In the manufacturing process of high-precision optical lenses, the pressing of the lens body with the upper and lower covers is one of the key steps. This process must ensure the airtightness or dustproofness between the upper and lower covers and the lens barrel, while also ensuring that the optical axis of the optical element is highly aligned with the mechanical axis after pressing to avoid image shift or distortion. Currently, the industry commonly uses a simple pressing fixture for this operation, the typical structure of which includes a fixed base, a positioning stage, and a rigid pressing head. During operation, the lens body is placed in the groove of the stage, and the pressing head is manually or pneumatically driven to press down, so that the upper and lower covers are embedded into the end face of the lens barrel.

[0003] However, such traditional tooling has significant drawbacks: (1) The lens body is initially positioned by the bottom groove during the pressing process. When the pressure head applies vertical pressure, if there is a small assembly gap or the pressure head is slightly off-center, the lens body is very likely to undergo micron-level lateral displacement or tilting, resulting in optical axis deviation of the final product. (2) Some improved solutions use rigid lateral grippers to clamp the outer wall of the lens before pressing, but the clamping force is difficult to control precisely, and the contact surface between the gripper and the lens is hard metal, which can easily scratch the coating on the outer surface of the lens or the plastic lens barrel, resulting in poor appearance or stress concentration. (3) In existing equipment, clamping and pressing are mostly two independent actions, requiring additional cylinders or motors for control. This not only increases the complexity of the equipment, but may also cause clamping delay or premature release due to asynchronous timing, affecting the pressing stability. (4) For lens models with different outer diameters, the entire set of stage and fixtures needs to be replaced, which is time-consuming and difficult to meet the flexible production needs of small batches and multiple varieties. Therefore, there is an urgent need for a pressing fixture that is simple in structure, requires no external control, and can automatically achieve flexible dynamic clamping during the pressing process. Utility Model Content

[0004] In order to overcome the problems in the prior art, this utility model provides a high-precision optical lens upper and lower cover pressing fixture, which solves the technical problems of the lens body being laterally displaced or tilted during the pressing process due to the lack of dynamic radial constraint in the existing pressing fixture, and the lens surface being easily damaged due to the use of rigid clamping mechanism.

[0005] To solve the above problems, this utility model adopts the following technical solution: A high-precision optical lens upper and lower cover pressing fixture mainly includes a base, a lifting pressure head assembly, a stage assembly, an annular flexible limiting ring, and a mechanical linkage retraction mechanism; the base is a rigid platform structure, and the stage assembly is fixedly installed in the center of its upper surface; the stage assembly includes a stage body, the top of the stage body is provided with a positioning groove for placing the optical lens body, and an annular mounting groove is opened around the positioning groove; the annular flexible limiting ring is embedded in the annular mounting groove, and its inner diameter is larger than the outer diameter of the lens to be pressed, and under normal conditions... In the open state; the lifting pressure head assembly is mounted above the base via a vertical guide frame and can move up and down in the vertical direction, with a pressure plate at its lower end; the mechanical linkage retraction mechanism includes multiple inclined wedge protrusions arranged circumferentially on the side wall of the lifting pressure head assembly, multiple radial sliders correspondingly arranged on the outer side of the annular mounting groove of the platform body, and a reset spring; the inner end of the radial slider is fixedly connected to the outer wall of the annular flexible limiting ring, and the outer end is provided with an inclined surface matching the inclined wedge protrusion; the reset spring is installed in the platform body and connected to the outer side of the inclined wedge protrusion, and is used to drive the radial slider to reset after the pressure head rises.

[0006] Furthermore, the annular flexible limiting ring is made of highly elastic silicone material or nickel-titanium shape memory alloy thin-walled tube, and its inner surface is coated with polytetrafluoroethylene or silicone soft film.

[0007] Furthermore, the inner diameter of the annular flexible limiting ring is 0.2 mm larger than the outer diameter of the lens to be pressed, and the wall thickness is 1 mm.

[0008] Furthermore, the number of the wedge protrusions is three to four, and they are evenly distributed circumferentially along the side wall of the lifting pressure head assembly.

[0009] Furthermore, the wedge protrusion is a truncated pyramid or a block structure with a specific bevel, precision machined from high-hardness tool steel, with its bevel facing the center of the platform assembly.

[0010] Furthermore, the number of radial sliders corresponds to the number of wedge protrusions, and they are evenly distributed along the circumference of the platform body.

[0011] Furthermore, the reset spring is a helical tension spring made of high-elasticity alloy steel wire, with one end fixed to the outer end face of the radial slider and the other end fixed to the tension spring seat provided in the body of the platform.

[0012] Furthermore, the platform body has multiple radial slides evenly distributed on its radial outer circumference. These radial slides are opened radially to guide the radial sliding of the radial slider.

[0013] Furthermore, the lifting head assembly is driven by a cylinder or a manual knob.

[0014] Furthermore, the pressure plate is made of rigid polyurethane material, and its lower surface is flat or designed to be slightly concave according to the shape of the optical lens cover to be pressed, with a concavity depth of 0.1-0.3mm and a radius of curvature matching the outer edge of the lens cover.

[0015] The beneficial effects of this utility model are: This invention utilizes a mechanically linked shrinkage mechanism to automatically trigger the radial shrinkage of the annular flexible retaining ring during the pressing process, achieving dynamic and synchronous clamping of the lens body. This structure effectively prevents lateral displacement during the pressing process, improving product coaxial accuracy and yield. The annular retaining ring, made of highly elastic material, provides uniform and gentle clamping force, avoiding hard contact that could damage the lens surface. Furthermore, by simply replacing the annular flexible retaining ring module with one of different inner diameters, it can be adapted to various lens models, reducing fixture costs. The entire device has a simple and reliable structure, requiring no additional drive source, significantly improving the stability and efficiency of the pressing process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a three-dimensional schematic diagram showing the connection between the platform assembly and the mechanical linkage retraction mechanism.

[0018] Figure 3 For the present utility model in Figure 2 A magnified view of a portion of point A in the middle.

[0019] Figure 4 This is a cross-sectional view showing the connection between the platform assembly and the radial slider.

[0020] Figure 5 This is a three-dimensional schematic diagram showing the connection between the wedge protrusion and the lifting pressure head assembly.

[0021] Figure 6 This is an exploded structural diagram of the lifting pressure head assembly, the wedge protrusion, and the pressure plate.

[0022] Figure 7 This is a schematic diagram of the working state of the mechanical linkage retraction mechanism.

[0023] Figure 8 For the present utility model in Figure 7 A magnified view of a section at point B in the middle.

[0024] Figure 9 This is an exploded structural diagram of the platform body, radial slider, and annular flexible limiting ring.

[0025] Explanation of reference numerals in the attached drawings: 1. Base; 2. Lifting pressure head assembly; 3. Platform assembly; 4. Annular flexible limiting retaining ring; 5. Mechanical linkage retraction mechanism; 6. Vertical guide frame; 7. Pressure plate; 8. Platform body; 9. Positioning groove; 10. Annular mounting groove; 11. Wedge protrusion; 12. Radial slider; 13. Reset tension spring; 14. Tension spring seat; 15. Radial slide rail. Detailed Implementation

[0026] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0027] Please see Figures 1 to 9 As shown, this utility model provides a high-precision optical lens upper and lower cover pressing fixture. The fixture mainly includes a base 1, a lifting pressure head assembly 2, a platform assembly 3, an annular flexible limiting ring 4, and a mechanical linkage retraction mechanism 5. The base 1 forms the support platform for the entire device, with the platform assembly 3 fixedly connected to the central area of ​​its upper surface. The lifting pressure head assembly 2 is mounted above the base 1 via a vertical guide frame 6, which guides the lifting pressure head assembly 2 to move vertically up and down, thus achieving the pressing operation of the optical lens. The mechanical linkage retraction mechanism 5 cleverly transforms the vertical movement of the lifting pressure head assembly 2 into a radial retraction drive for the annular flexible limiting ring 4, thereby simultaneously achieving dynamic flexible clamping of the optical lens body during the pressing process.

[0028] The base 1 is a rigid, integrally molded platform structure, with a rectangular body, precision-machined from high-strength alloy steel or cast iron. The upper surface of the base 1 is precision-ground to achieve extremely high flatness, serving as the mounting reference for all upper components of the equipment. A set of threaded holes is pre-drilled in the central area of ​​the upper surface of the base 1 for securely fixing the platform assembly 3 to the base 1 using bolts. The sides and bottom of the base 1 can be machined with structural features for equipment handling or connection to the production line, such as mounting feet or positioning grooves. The overall design of the base 1 ensures the stability and shock resistance of the equipment during high-speed pressing operations.

[0029] The stage assembly 3 includes a stage body 8. The stage body 8 is a hollow cylindrical or square block, precision-machined from high-strength aluminum alloy, and its upper surface is also precision-ground. The lower surface of the stage body 8 is fixedly connected to the base 1 by precision-fitting positioning pins and bolts, ensuring its precise positioning and rigid connection relative to the base 1. A positioning groove 9 for placing the optical lens body to be pressed is machined in the center of the top of the stage body 8. The positioning groove 9 is circular, and its depth is precisely controlled to 0.5 mm to ensure that the bottom plane of the optical lens body is flush with or slightly lower than the upper surface of the stage body 8, while providing stable support. The inner diameter of the positioning groove 9 is slightly larger than the outer diameter of the optical lens body, allowing the optical lens body to be freely inserted before pressing. A concentric annular mounting groove 10 is formed on the periphery of the positioning groove 9, i.e., on the top surface of the stage body 8. The annular mounting groove 10 is annular groove with a width of 3 mm and a depth of 2 mm. The inner and outer walls of the annular mounting groove 10 are precision machined to ensure that the annular flexible retaining ring 4 can be accurately fitted into it. The bottom of the annular mounting groove 10 is flat, providing a stable support surface for the annular flexible retaining ring 4. Multiple radial slides 15 are evenly distributed circumferentially on the radial outer side of the platform body 8. These radial slides 15 are radially opened to guide the radial sliding of the radial sliders 12. The number of radial slides 15 corresponds to the number of radial sliders 12 in the mechanical linkage retraction mechanism 5, ensuring that each radial slider 12 can perform precise radial movement within an independent slide. The platform body 8 also has multiple tension spring seats 14 at the outer end of the radial slides 15. These tension spring seats 14 are groove-shaped or through-hole-shaped to accommodate the reset tension springs 13.

[0030] The annular flexible retaining ring 4 has a complete annular structure and is made of high-elasticity silicone material (Shore hardness A 50-70, elastic recovery rate ≥95%) or nickel-titanium shape memory alloy thin-walled tube (phase transition temperature 20-30°C, hyperelastic strain 8%). If high-elasticity silicone material is used, it is injection molded using a precision mold; if nickel-titanium shape memory alloy thin-walled tube is used, it is formed by precise winding or welding. The outer diameter of the annular flexible retaining ring 4 is tightly fitted with the inner diameter of the annular mounting groove 10, and its wall thickness is 1 mm. Under normal conditions (i.e., when not subjected to radial compression), the inner diameter of the annular flexible retaining ring 4 is 0.2 mm larger than the outer diameter of the optical lens body to be pressed, thus allowing the optical lens body to be placed freely in the non-working state. The inner surface of the annular flexible retaining ring 4 is covered with a layer of polytetrafluoroethylene or silicone soft film. This covering layer is integrated with the annular flexible retaining ring 4 body through chemical bonding or co-extrusion process. The coating layer has an extremely low coefficient of friction and good surface flexibility, ensuring that no scratches or damage are caused to the surface of the optical lens body when it is clamped. The outer wall of the annular flexible limiting ring 4 is fixedly connected to the inner ends of multiple radial sliders 12. This fixed connection can be achieved by precision adhesive, small-sized embedded fasteners, or riveting after pre-made protrusions on the outer wall of the annular flexible limiting ring 4 mate with the grooves of the radial sliders 12, so as to ensure that the annular flexible limiting ring 4 can synchronously and uniformly contract and expand radially when the radial sliders 12 move. When the annular flexible limiting ring 4 is not subjected to radial force, its elasticity keeps it in an open state with its inner diameter at its maximum value. When subjected to external radial compression, it can uniformly contract in the inner diameter direction and provide a uniform radial clamping force.

[0031] The mechanical linkage retraction mechanism 5 is the core component for achieving dynamic flexible clamping. It includes multiple wedge protrusions 11, multiple radial sliders 12, and multiple return springs 13. The number of wedge protrusions 11 is three to four, evenly distributed circumferentially along the sidewall of the lifting pressure head assembly 2. Each wedge protrusion 11 is a truncated pyramid or a block structure with a specific bevel, precision machined from high-hardness tool steel, and its surface is hardened and finely ground to ensure its wear resistance and smooth fit with the bevel of the radial slider 12. The outer wall of the wedge protrusion 11 is fixedly connected to the sidewall of the lifting pressure head assembly 2 by precision threads or pins, with its bevel facing the center of the pressure plate 7 and corresponding to the bevel of the radial slider 12. When the lifting pressure head assembly 2 moves downwards vertically, the bevel of the wedge protrusion 11 contacts the bevel of the radial slider 12 and generates an interacting radial force.

[0032] The number of radial sliders 12 corresponds to the number of wedge protrusions 11, and they are evenly distributed circumferentially along the outer side of the annular mounting groove 10 of the platform body 8. Each radial slider 12 is a cuboid block, precision machined from stainless steel. Its outer end has a bevel that precisely matches the bevel of the wedge protrusion 11, ensuring effective radial thrust when they contact each other. The inner end of the radial slider 12 is fixedly connected to the outer wall of the annular flexible retaining ring 4; as mentioned earlier, this connection must be robust and able to uniformly transmit radial force. The body of the radial slider 12 is precisely machined along its length, allowing it to slide smoothly in a straight line within the radial slide rail 15 opened within the platform body 8. A precision clearance fit is used between the radial slider 12 and the radial slide rail 15 to ensure sliding accuracy and reduce friction. The outer end face of the radial slider 12 is provided with a connector for connecting the return spring 13.

[0033] The reset spring 13 is a helical tension spring made of high-elasticity alloy steel wire, exhibiting excellent fatigue life. One end of the reset spring 13 is fixed to the outer end face of the radial slider 12, and the other end is fixed to the spring seat 14 provided inside the platform body 8. The spring seat 14 is a cylindrical blind hole or a stepped hole, with its inner diameter closely matching the outer diameter of the reset spring 13, providing stable support and guidance for the reset spring 13. Each reset spring 13 has a pre-tension of 1 mm during installation. Each reset spring 13 is stretched to 1 mm longer than its free length during installation and then fixed to the spring seat 14, ensuring that when the mechanical linkage retraction mechanism 5 is deactivated, the radial slider 12 can reliably reset outward, thereby restoring the annular flexible limiting ring 4 to its normal open state.

[0034] The lifting pressure head assembly 2 mainly includes a pressing body and a pressure plate 7 installed at its lower end. The pressing body has a hollow columnar structure and is precision machined from high-strength aluminum alloy or steel. Multiple wedge protrusions 11 are distributed circumferentially on the sidewalls of the lifting pressure head assembly 2. These wedge protrusions 11 are integrally formed with the pressing body of the lifting pressure head assembly 2 through precision machining, or are fixedly connected by high-strength bolts and locating pins. The pressing body of the lifting pressure head assembly 2 slides against a linear bearing on the inner support plate of the vertical guide frame 6 through its outer circumferential surface, ensuring stable and low-friction movement in the vertical direction. A drive mechanism with a cylinder or manual knob is installed on the top of the vertical guide frame 6. The lifting pressure head assembly 2 can be driven by a cylinder or a manual knob. If a cylinder is used, the piston rod of the cylinder is connected to the top of the pressing body, and precise vertical movement and the application of pressing force are achieved through air pressure control. If a manual knob is used, the manual knob drives the pressing body up and down through a threaded screw or rack and pinion mechanism. The lower end of the lifting pressure head assembly 2 is fixedly connected to a pressure plate 7. The pressure plate 7 is circular and is precision molded or machined from rigid polyurethane material. The lower surface of the pressure plate 7 is either flat or designed to be slightly concave according to the shape of the optical lens cover to be pressed, with a concavity depth of 0.1-0.3mm and a radius of curvature matching the outer edge of the lens cover. This is achieved through 3D scanning reverse modeling to ensure a uniform contact surface is formed between the pressure plate and the optical lens cover during the pressing process, and to provide a flexible pressing force to avoid damage to the optical lens cover. The pressure plate 7 is detachably connected to the lower end face of the lifting pressure head assembly 2 by multiple countersunk screws or locating pins for easy replacement or maintenance.

[0035] The vertical guide frame 6 consists of two or four parallel guide columns or a U-shaped frame structure, precision-machined from high-strength structural steel or hard aluminum alloy. The vertical guide frame 6 is fixedly connected to both sides of the base 1 by high-strength bolts, ensuring a rigid connection and precise positioning between them. Inside the vertical guide frame 6, specifically on the support plate at the top of the guide columns or the vertical arm of the U-shaped frame, high-precision linear bearings are installed. These linear bearings are either rolling or sliding linear bearings, with their internal rolling elements or sliding surfaces tightly engaging with the outer circumference or side surface of the lifting pressure head assembly 2. The linear bearings effectively restrict the horizontal degree of freedom of the lifting pressure head assembly 2, allowing only smooth, low-friction up-and-down movement in the vertical direction. The rigidity and precision of the vertical guide frame 6 directly affect the vertical movement trajectory of the lifting pressure head assembly 2, thereby ensuring coaxiality and pressing stability during the pressing process.

[0036] The working process of this utility model is as follows: Before pressing, the optical lens body to be pressed is placed in the positioning groove 9 of the stage assembly 3. At this time, the annular flexible limiting ring 4 is in an open state under the action of the reset spring 13, and its inner diameter is larger than the outer diameter of the optical lens body, so it does not interfere with the placement of the optical lens body. Subsequently, the operator starts the lowering action of the lifting pressure head assembly 2. Whether driven by a cylinder or a manual knob, the lifting pressure head assembly 2 is guided by the linear bearing of the vertical guide frame 6 and moves smoothly downward. As the lifting pressure head assembly 2 descends, the multiple inclined wedge protrusions 11 on its side wall gradually contact the inclined surfaces of the outer ends of the radially distributed sliders 12 on the stage body 8. The vertical downward movement of the wedge protrusion 11 generates a radial force pointing towards the center of the platform body 8 through the interaction between the inclined surfaces (the inclined surface angle of the wedge protrusion 11 is 15-20 degrees, the length is 10mm, and after contacting the matching inclined surface of the radial slider 12, each millimeter of vertical displacement generates a radial force of 0.3-0.5mm radial displacement), pushing multiple radial sliders 12 to slide inward along their respective radial slideways 15. The inward sliding action of the radial slider 12, through its fixed connection with the outer wall of the annular flexible limiting ring 4, causes the annular flexible limiting ring 4 to synchronously and uniformly contract in the inward diameter direction. When the annular flexible limiting ring 4 contracts until its inner diameter is in close contact with the outer peripheral surface of the optical lens body, the polytetrafluoroethylene or silicone soft film covering its inner surface applies a uniform and gentle circumferential clamping force to the optical lens body, thereby accurately positioning the optical lens body at the center of the positioning groove 9 and effectively restraining its lateral displacement and tilting during the pressing process. While the annular flexible retaining ring 4 dynamically clamps the optical lens body, the lifting pressure head assembly 2 continues to descend until its lower end pressure plate 7 contacts the upper cover placed above the optical lens body, applying a preset pressing force to complete the pressing of the upper and lower covers. After pressing, the lifting pressure head assembly 2 rises upward under the action of the drive mechanism. As the lifting pressure head assembly 2 rises, the inclined wedge protrusion 11 separates from the inclined surface of the radial slider 12. At this time, under the pulling force of the reset spring 13, the radial slider 12 slides outward along the radial slide 15, causing the annular flexible retaining ring 4 to expand evenly in the outer diameter direction, restoring it to its normal open state, releasing the clamping of the optical lens body, and making it convenient for the operator to remove the pressed optical lens.

[0037] In another embodiment of this utility model, the driving method of the lifting pressure head assembly 2 can be further refined. For example, the cylinder can be replaced by a precision electric push rod, and the precise position control and pressing force adjustment of the lifting pressure head assembly 2 can be achieved by a servo motor driving the lead screw. The electric push rod is connected to the pressing body of the lifting pressure head assembly 2 by a threaded connection or a pin connection. Its structure is basically the same as that of the first embodiment, and will not be described again here.

[0038] In another embodiment of this utility model, the connection between the annular flexible retaining ring 4 and the radial slider 12 can be an integrated design. Specifically, the outer wall of the annular flexible retaining ring 4 can be pre-molded with multiple radially extending connecting protrusions. These connecting protrusions are precisely fitted with the inner end of the radial slider 12, and then seamlessly connected by ultrasonic welding or hot riveting. The radial slider 12 is still made of stainless steel, but its inner end structure is optimized to match the connecting protrusions of the annular flexible retaining ring 4. This integrated connection eliminates errors that may be caused by adhesives or fasteners, further improving the uniformity and accuracy of radial shrinkage. Its structure is basically the same as that of the first embodiment, and will not be described again here.

[0039] In another embodiment of this utility model, the number of the wedge protrusions 11 can be adjusted according to the actual size of the pressing part and the pressing accuracy requirements, for example, increased to six, to provide a more uniform radial driving force. When the number of wedge protrusions 11 increases, the corresponding number of radial sliders 12 and return springs 13 also increases, and are evenly distributed along the circumference of the lifting pressure head assembly 2 and the platform body 8. This design of increasing the number, while maintaining a compact structure, further improves the radial driving uniformity of the annular flexible limiting ring 4, thereby enhancing the clamping stability and coaxiality of the optical lens body. Its structure is basically the same as that of the first embodiment, and will not be described again here.

[0040] In another embodiment of this invention, the depth of the positioning groove 9 can be adjusted according to the bottom structure of the optical lens body to ensure placement stability. For example, when the bottom of the optical lens body has a complex structure, the positioning groove 9 can be designed as an irregularly shaped groove with a corresponding contour, whose depth and shape precisely match the bottom of the optical lens body to achieve more stable positioning. The inner wall of the positioning groove 9 can also be precision ground or polished to reduce friction with the optical lens body and avoid surface damage to the optical lens body. Its structure is basically the same as that of the first embodiment, and will not be described again here.

[0041] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A high-precision optical lens upper and lower cover pressing fixture, comprising a base (1), characterized in that: It also includes a lifting pressure head assembly (2), a platform assembly (3), an annular flexible limiting ring (4), and a mechanical linkage retraction mechanism (5); the base (1) is a rigid platform structure, and the platform assembly (3) is fixedly installed in the center of its upper surface; the platform assembly (3) includes a platform body (8), the top of the platform body (8) is provided with a positioning groove (9) for placing the optical lens body, and an annular mounting groove (10) is opened around the positioning groove (9); the annular flexible limiting ring (4) is embedded in the annular mounting groove (10), its inner diameter is larger than the outer diameter of the lens to be pressed, and it is normally in an open state; the lifting pressure head assembly (2) is installed on the platform through a vertical guide frame (6). Above the base (1), it can move up and down in the vertical direction, and its lower end is provided with a pressure plate (7); the mechanical linkage retraction mechanism (5) includes a plurality of inclined wedge protrusions (11) arranged in the circumferential direction of the side wall of the lifting pressure head assembly (2), a plurality of radial sliders (12) correspondingly arranged on the outside of the annular mounting groove (10) of the platform body (8), and a reset spring (13); the inner end of the radial slider (12) is fixedly connected to the outer wall of the annular flexible limiting ring (4), and the outer end is provided with an inclined surface matching the inclined wedge protrusion (11); the reset spring (13) is installed in the platform body (8) and connected to the outside of the inclined wedge protrusion (11), and is used to drive the radial slider (12) to reset after the pressure head rises.

2. The high-precision optical lens upper and lower cover pressing fixture according to claim 1, characterized in that: The annular flexible limiting ring (4) is made of high elastic silicone material or nickel-titanium memory alloy thin-walled tube, and its inner surface is covered with polytetrafluoroethylene or silicone soft film.

3. The high-precision optical lens upper and lower cover pressing fixture according to claim 1, characterized in that: The inner diameter of the annular flexible limiting ring (4) is 0.2 mm larger than the outer diameter of the lens to be pressed, and the wall thickness is 1 mm.

4. The high-precision optical lens upper and lower cover pressing fixture according to claim 1, characterized in that: The number of the wedge protrusions (11) is three to four, and they are evenly distributed along the circumferential direction of the side wall of the lifting head assembly (2).

5. The high-precision optical lens upper and lower cover pressing fixture according to claim 4, characterized in that: The wedge protrusion (11) is a truncated pyramid or a block structure with a specific bevel, and is precision machined from high-hardness tool steel, with its bevel facing the center of the platform assembly (3).

6. The high-precision optical lens upper and lower cover pressing fixture according to claim 1, characterized in that: The number of radial sliders (12) corresponds to the number of wedge protrusions (11), and they are evenly distributed circumferentially along the platform body (8).

7. The high-precision optical lens upper and lower cover pressing fixture according to claim 1, characterized in that: The reset spring (13) is a helical tension spring made of high elasticity alloy steel wire. One end of it is fixed to the outer end face of the radial slider (12), and the other end is fixed in the spring seat (14) provided in the platform body (8).

8. The high-precision optical lens upper and lower cover pressing fixture according to claim 1, characterized in that: The platform body (8) has a plurality of radial slides (15) evenly distributed on its radial outer circumference. The radial slides (15) are opened radially to guide the radial sliding of the radial slider (12).

9. The high-precision optical lens upper and lower cover pressing fixture according to claim 1, characterized in that: The lifting head assembly (2) is driven by a cylinder or a manual knob.

10. The high-precision optical lens upper and lower cover pressing fixture according to claim 1, characterized in that: The pressure plate (7) is made of rigid polyurethane material. Its lower surface is flat or designed to be slightly concave according to the shape of the optical lens cover to be pressed. The concavity depth is 0.1-0.3mm and the radius of curvature matches the outer edge of the lens cover.

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