Clamping equipment for optical lens polishing

Abstract

The utility model discloses clamping equipment for optical lens polishing, and belongs to the technical field of optical lens machining. The equipment comprises a machining base, an automatic centering clamping module, a grinding executing mechanism, a cooling liquid nozzle and a waste collecting tank. The automatic centering clamping module realizes automatic centering of the lens through linkage of a limiting sliding block and a flexible clamping unit, and the clamping force is uniform and adjustable; the polishing executing mechanism adopts a crank sliding block mechanism to drive a swing arm to swing periodically, and a multi-degree-of-freedom polishing track is formed by combining synchronous rotation of a rotating platform; the cooling liquid nozzle tangentially sprays to cover the machining area, and efficient cooling and waste recycling are achieved through cooperation of the seepage holes and the inclined flow guide face. The clamping device solves the problems that traditional equipment is low in clamping precision, poor in cooling effect and insufficient in machining flexibility, and is suitable for efficient machining of high-precision optical lenses.

Description

Technical Field

[0001] This utility model relates to the field of optical lens processing technology, specifically to a clamping device for optical lens polishing, which is particularly suitable for automatic centering clamping and cooling waste treatment in high-precision lens processing. Background Technology

[0002] Optical lenses require precision polishing during manufacturing to eliminate surface defects and achieve a predetermined curvature. The stability and precision of the clamping equipment directly affect the quality of the lens processing. Currently, traditional optical lens clamping devices mostly use mechanical clamps or vacuum adsorption to fix the lenses, which still have the following shortcomings:

[0003] 1. Poor clamping adaptability: Mechanical clamps require manual adjustment of the clamping position according to the lens size, which is cumbersome and makes it difficult to guarantee the center positioning accuracy; vacuum adsorption has high requirements for the flatness of the lens surface, and is prone to displacement due to uneven adsorption.

[0004] 2. Low cooling and chip removal efficiency: The chips generated during the grinding process tend to adhere to the lens surface. Traditional equipment often uses single-point coolant spray, which has a limited coverage area and cannot effectively clean the processing area, resulting in chip accumulation and local overheating of the lens.

[0005] 3. Incomplete waste collection: The existing equipment has a simple waste tank design. When waste liquid and debris mix, it is easy to block the flow channel, requiring frequent shutdowns for cleaning, which affects processing efficiency.

[0006] 4. Limited grinding trajectory: Traditional grinding mechanisms mostly rely on linear or fixed-angle movements, which are difficult to adapt to the processing needs of complex curved surfaces, and the feed depth adjustment is not flexible enough.

[0007] To address the aforementioned issues, existing technologies have disclosed some improvement solutions, such as using elastic grippers or pneumatic clamping structures. However, these still suffer from uneven clamping force and low automation levels. Another solution uses a multi-nozzle cooling system to improve heat dissipation, but this is complex and costly. Therefore, there is an urgent need for equipment that integrates automatic centering and clamping, efficient cooling and chip removal, and multi-degree-of-freedom grinding functions to meet the processing requirements of high-precision optical lenses. Utility Model Content

[0008] 1. Technical problem to be solved:

[0009] To address the problems of poor clamping stability, low cooling efficiency, and inconvenient waste recycling in existing technologies, this utility model provides a clamping device for optical lens grinding, which realizes automatic lens centering, flexible clamping, precise cooling, and automatic waste recycling.

[0010] 2. Technical Solution:

[0011] To solve the above problems, the present invention adopts the following technical solution.

[0012] A clamping device for polishing optical lenses includes a processing base, the upper surface of which is provided with a positioning groove, and an automatic centering clamping module is provided at the center of the positioning groove;

[0013] The upper surface of the processing base is provided with a grinding execution mechanism, and the processing end of the grinding execution mechanism is located above the automatic centering clamping module;

[0014] The side of the processing base is provided with a coolant nozzle, and the spray direction of the coolant nozzle covers the processing area of ​​the automatic centering clamping module.

[0015] The bottom of the positioning groove is provided with a waste collection groove, which is located on one side of the bottom of the automatic centering clamping module.

[0016] A further improvement is that the automatic centering and clamping module includes a housing fixed to the bottom of the positioning groove, a sealing cover plate covering the top of the housing, and a flexible clamping unit;

[0017] The inner bottom sidewall of the shell is provided with several seepage holes, and its inner bottom surface is a conical guide surface. The central end of the conical guide surface is rotatably connected to a rotating platform, and a third motor is installed at the bottom center end of the shell.

[0018] The upper end of the sealing cover plate has four rectangular limiting through holes arranged in a cross shape;

[0019] The rotating platform is hinged to the limiting slider by four sets of symmetrically distributed connecting rods, wherein a first electric push rod is provided between the bottom inner sides of two sets of the limiting sliders, and the limiting slider is slidably engaged with the limiting through hole;

[0020] The flexible clamping unit includes three sets of clamping bases and elastic limiting posts. The three sets of clamping bases are fixedly connected by connecting rods. The surface of the elastic limiting posts is covered with a silicone protective layer and is driven to extend and retract by a micro pneumatic actuator embedded in the clamping base.

[0021] A further improvement is that the grinding actuator includes a vertical column, a swing arm, and a grinding head;

[0022] The vertical column is fixed on the processing base, and a first motor is provided on its side. The output end of the first motor is connected to the eccentric turntable.

[0023] The eccentric turntable is hinged to the swing arm via a linkage rod. A second electric push rod is installed at the end of the swing arm. The telescopic end of the second electric push rod extends through to the lower side of the swing arm. A connecting plate is fixedly connected to the bottom end of the telescopic end of the swing arm. A second motor is installed at the bottom end of the connecting plate. The output end of the second motor is connected to the grinding head.

[0024] A further improvement is that the two ends of the linkage rod are respectively connected to the eccentric shaft of the eccentric turntable and the hinge shaft of the swing arm to form a crank-slider mechanism, which is used to convert the rotational motion of the eccentric turntable into the periodic oscillation of the grinding head.

[0025] A further improvement is that the spray direction of the coolant nozzle is tangent to the swing trajectory of the grinding head, and the nozzle flow rate and pressure are adjustable.

[0026] A further improvement is that the bottom of the waste collection tank is provided with an inclined guide surface, and its outlet end is connected to an external waste treatment system.

[0027] A further improvement is that the extension stroke of the elastic limiting post is adjustable to accommodate the clamping requirements of optical lenses of different diameters.

[0028] A further improvement is that the swing angle range of the swing arm is 30° to 120°, and the extension and retraction stroke of the second electric push rod is linked to the feed depth of the grinding head.

[0029] 3. Beneficial effects:

[0030] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0031] (1) High-precision adaptive clamping:

[0032] The automatic centering and clamping module drives the limiting slider to move synchronously through the first electric push rod. In conjunction with the extension and retraction of the elastic limiting posts of the three sets of flexible clamping units, it can achieve rapid and automatic centering of the lens, with uniform and adjustable clamping force to avoid damage to the lens surface.

[0033] The rotating design of the third motor and housing ensures that the lens rotates synchronously during the clamping and polishing process, achieving more efficient polishing operations.

[0034] (2) High-efficiency cooling and waste management:

[0035] The coolant nozzles adopt a tangential spray pattern, covering the swing trajectory of the grinding head. Combined with the seepage holes at the bottom of the housing and the conical guide surface, a circulating coolant flow is formed, which effectively reduces the processing temperature and washes away the debris.

[0036] The inclined guide surface of the waste collection tank is linked with the external treatment system to achieve rapid separation and continuous discharge of waste liquid and debris, reducing the frequency of equipment downtime for cleaning.

[0037] (3) Precision grinding with multiple degrees of freedom:

[0038] The grinding actuator converts the rotational motion of the eccentric turntable into the periodic oscillation of the swing arm through the crank-slider mechanism. Combined with the second electric push rod to control the feed depth of the grinding head, a compound motion trajectory is formed, which can complete the machining of complex curved surfaces.

[0039] The linkage control of the swing angle and feed depth, combined with the high-speed rotation of the grinding head driven by the second motor, significantly improves the surface finish and processing consistency.

[0040] (4) Modularity and scalability:

[0041] The travel of the flexible limit post, the parameters of the coolant nozzle, and the waste collection system can all be adjusted according to the lens size and process requirements, adapting to the processing of lenses of different specifications and offering strong scalability.

[0042] In summary, this solution, through structural optimization and automated control, solves the problems of low clamping accuracy, poor cooling effect, and insufficient processing flexibility of traditional equipment, and has significant application value in the field of optical lens processing.

[0043] It should be noted that the structures not described in this utility model are the same as or can be implemented using existing technology, and will not be elaborated here, as they do not involve the design points and improvement directions of this utility model. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0045] Figure 2 This is an exploded view of the automatic centering and clamping module of this utility model;

[0046] Figure 3 This is a schematic diagram of the flexible clamping unit of this utility model;

[0047] Figure 4 This is a schematic diagram of the grinding actuator of this utility model.

[0048] Explanation of the labels in the diagram:

[0049] 1. Machining the base; 2. Positioning groove;

[0050] 3. Automatic centering and clamping module; 31. Housing; 311. Leakage hole; 32. Sealing cover; 321. Limiting through hole; 33. Rotating platform; 34. Connecting rod; 35. Limiting slider; 36. First electric push rod;

[0051] 37. Flexible clamping unit; 371. Clamping base; 372. Connecting rod; 373. Elastic limiting post;

[0052] 4. Grinding actuator; 41. Vertical column; 42. Swing arm; 43. First motor; 44. Eccentric turntable; 45. Linkage rod; 46. Second electric push rod; 47. Connecting plate; 48. Second motor; 49. Grinding head;

[0053] 5. Coolant nozzle; 6. Waste collection tank. Detailed Implementation

[0054] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0055] I. Component Installation

[0056] 1. Installation of machining base and positioning groove

[0057] Fix the processing base 1 to the worktable surface, ensuring that its levelness error is ≤0.1mm.

[0058] A circular positioning groove 2 is machined on the upper surface of the processing base 1. The groove is 15mm deep and the inner diameter of the groove is slightly larger than the maximum diameter of the lens to be processed.

[0059] A through hole is made at the center of the bottom of the positioning groove 2 for installing the housing 31 of the automatic centering clamping module 3, and fixing it with bolts.

[0060] 2. Automatic centering and clamping module assembly

[0061] The housing 31 is embedded in the bottom of the positioning groove 2, and multiple seepage holes 311 with a diameter of 3mm are evenly opened on its bottom side wall for coolant return.

[0062] A tapered guide surface with a cone angle of 30° is machined on the bottom surface inside the housing 31, and a rotating platform 33 is installed in the center and rotated through a bearing.

[0063] A sealing cover plate 32 is placed on the top of the housing 31. Four rectangular limiting through holes 321 with a cross distribution are opened on the cover plate. The holes are 10mm wide and slide with the limiting slider 35.

[0064] One end of the four sets of connecting rods 34 is hinged to the edge of the rotating platform 33, and the other end is connected to the limiting slider 35. The inner sides of two sets of sliders are driven to move synchronously by the first electric push rod 36.

[0065] Three sets of flexible clamping units 37 are installed above the sealing cover plate 32:

[0066] The clamping base 371 is fixed to the upper side of the limiting slider 35 via the connecting rod 372. A micro pneumatic actuator is embedded inside the base to drive the elastic limiting column 373 to extend and retract. The surface of the column is covered with a 2mm thick silicone layer.

[0067] 3. Grinding and installing the actuator

[0068] A column 41 is vertically fixed at the upper end of the processing base 1, and a swing arm 42 is connected to its side via a rotating shaft.

[0069] The first drive motor 43 is installed on the side of the column 41, and the output end is connected to the eccentric turntable 44 with an eccentricity of 20mm.

[0070] The two ends of the linkage rod 45 are respectively hinged to the hinge shafts of the eccentric turntable 44 and the swing arm 42, forming a crank-slider mechanism.

[0071] A second electric push rod 46 is installed at the end of the swing arm 42. Its telescopic end extends through to the bottom of the swing arm and is connected to the second motor 48 and the grinding head 49 through the connecting plate 47.

[0072] 4. Auxiliary system installation

[0073] A coolant nozzle 5 is installed on the side wall of the machining base 1. The nozzle angle is adjusted to be tangent to the swing trajectory of the grinding head 49, and the spray pressure is set to 0.3-0.5MPa.

[0074] A waste collection trough is opened on one side of the bottom of the positioning trough. The angle of the inclined guide surface inside the trough is 15°, and the outlet is connected to an external negative pressure waste treatment pipeline.

[0075] II. Operating Steps and Process

[0076] 1. Lens clamping and centering

[0077] Place the lens to be processed in the center of the sealing cover plate 32, start the first electric push rod 36, push the two sets of limit sliders 35 to move towards the center, and drive the rotating platform 33 to fine adjust its position through the connecting rod 34.

[0078] The elastic limiting posts 373 of the three sets of flexible clamping units 37 are extended synchronously by the pneumatic actuator. After contacting the edge of the lens, a constant force of 5-10N is applied to achieve automatic centering and fixation of the lens.

[0079] 2. Grinding trajectory control

[0080] The first motor 43 is started, and the eccentric turntable 44 rotates at 60 r / min, driving the swing arm 42 to swing periodically at an angle of 30°-120° through the linkage rod 45.

[0081] The second electric push rod 46 extends and retracts according to a preset program, controlling the grinding head 49 to feed to a depth of 0.01-0.1 mm / time, while the second motor 48 drives the grinding head to rotate at a high speed of 8000 r / min.

[0082] The third motor drives the housing 31 to rotate the lens synchronously.

[0083] 3. Cooling and waste disposal

[0084] Coolant nozzle 5 sprays water-based coolant into the processing area at a flow rate of 5L / min. The liquid flow covers the oscillation trajectory of the grinding head, reducing the lens temperature and flushing away debris.

[0085] Waste liquid and debris flow into the bottom of the shell 31 through the seepage hole 311, converge into the waste collection tank 6 along the conical guide surface, and are discharged into the external treatment system through the inclined guide surface.

[0086] 4. Processing completion and resetting

[0087] After polishing is completed, the second electric push rod 46 retracts, and the polishing head 49 is lifted away from the lens surface.

[0088] The first electric push rod 36 resets, the elastic limit post 373 retracts, the lens is removed and residual debris is cleaned.

[0089] III. Operational Results

[0090] 1. Adaptive clamping effect

[0091] The automatic centering module 3, through linkage and elastic clamping of the limit slider 35, controls the centering accuracy of the lens within ±0.05mm with a diameter error of ±2mm, avoiding processing errors caused by clamping offset.

[0092] 2. Composite motion polishing effect

[0093] The periodic oscillation of the swing arm 42 and the rotation of the grinding head 49 superimpose to form a spiral grinding trajectory, reducing the surface roughness of the lens from Ra1.6μm to Ra0.2μm. At the same time, the third motor drives the housing 31 to rotate synchronously, improving the processing efficiency by 40%.

[0094] 3. Optimized cooling and chip removal effects

[0095] Tangential coolant spray covers more than 90% of the processing area, the lens temperature is stabilized at 25±2℃, the amount of debris residue is reduced by 70%, and the waste collection system can operate continuously for 8 hours without clogging.

[0096] IV. Key Points of Implementation Steps

[0097] 1. Debugging and Calibration

[0098] Use a standard calibration block to adjust the extension stroke of the elastic limit post 373 to ensure that it matches the lens diameter, such as a 15mm stroke for a Φ50mm lens.

[0099] The grinding parameters are set via PLC: oscillation frequency 2Hz, feed rate 0.05mm / time, and coolant pressure 0.4MPa.

[0100] 2. Processing flow example

[0101] Step 1: Clamp the Φ60mm lens, start the automatic centering program, and complete the centering in 3 seconds.

[0102] Step 2: Perform two-stage processing with a rough grinding feed of 0.1 mm and a fine grinding feed of 0.02 mm, with a total processing time of 120 seconds.

[0103] Step 3: Coolant is used for simultaneous rinsing, and waste is discharged through the guide channel. After processing, the lens surface is free of scratches and the curvature error is ≤0.01mm.

[0104] 3. Safety and Maintenance

[0105] Check the seepage hole 311 for blockage daily, lubricate the rotating platform bearing 33 weekly, and replace the silicone protective layer quarterly.

[0106] The above-described embodiments are merely illustrative of certain implementations of this utility model, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A clamping device for polishing optical lenses, comprising a processing base (1), characterized in that: The upper surface of the processing base (1) is provided with a positioning groove (2), and the center of the positioning groove (2) is provided with an automatic centering clamping module (3). The upper surface of the processing base (1) is provided with a grinding execution mechanism (4), and the processing end of the grinding execution mechanism (4) is located above the automatic centering clamping module (3); The processing base (1) is provided with a coolant nozzle (5) on its side, and the spray direction of the coolant nozzle (5) covers the processing area of ​​the automatic centering clamping module (3). The bottom of the positioning groove (2) is provided with a waste collection groove (6), which is located on one side of the bottom of the automatic centering clamping module (3).

2. The clamping device for optical lens polishing according to claim 1, characterized in that: The automatic centering clamping module (3) includes a housing (31) fixed to the bottom of the positioning groove (2), a sealing cover plate (32) covering the top of the housing (31), and a flexible clamping unit (37). The inner bottom sidewall of the housing (31) is provided with several seepage holes (311), and its inner bottom surface is a conical guide surface. The center end of the conical guide surface is rotatably connected to a rotating platform (33). A third motor is installed at the bottom center end of the housing (31) to drive the housing (31) to rotate. The upper end of the sealing cover (32) is provided with four rectangular limiting through holes (321) arranged in a cross shape. The rotating platform (33) is hinged to the limiting slider (35) by four sets of symmetrically distributed connecting rods (34), wherein a first electric push rod (36) is provided between the bottom inner sides of two sets of the limiting sliders (35), and the limiting slider (35) is slidably engaged with the limiting through hole (321). The flexible clamping unit (37) includes three sets of clamping bases (371) and elastic limiting posts (373). The three sets of clamping bases (371) are fixedly connected by connecting rods (372). The surface of the elastic limiting post (373) is covered with a silicone protective layer and is driven to extend and retract by a micro pneumatic actuator embedded in the clamping base (371).

3. The clamping device for optical lens polishing according to claim 2, characterized in that: The grinding actuator (4) includes a vertical column (41), a swing arm (42), and a grinding head (49). The vertical column (41) is fixed on the processing base (1), and a first motor (43) is provided on its side. The output end of the first motor (43) is connected to the eccentric turntable (44). The eccentric turntable (44) is hinged to the swing arm (42) via a linkage rod (45). A second electric push rod (46) is installed at the end of the swing arm (42). The telescopic end of the second electric push rod (46) extends through to the lower side of the swing arm (42). A connecting plate (47) is fixedly connected to the bottom end of the telescopic end of the swing arm (42). A second motor (48) is installed at the bottom end of the connecting plate (47). The output end of the second motor (48) is connected to the grinding head (49).

4. The clamping device for optical lens polishing according to claim 3, characterized in that: The two ends of the linkage rod (45) are respectively connected to the eccentric shaft of the eccentric turntable (44) and the hinge shaft of the swing arm (42). The length of the linkage rod (45) matches the eccentricity of the eccentric turntable (44) to form a crank-slider mechanism, which is used to convert the rotational motion of the eccentric turntable (44) into the periodic oscillation of the grinding head (49).

5. The clamping device for optical lens polishing according to claim 1, characterized in that: The spray direction of the coolant nozzle (5) is tangent to the swing trajectory of the grinding head (49).

6. The clamping device for optical lens polishing according to claim 1, characterized in that: The bottom of the waste collection tank (6) is provided with an inclined guide surface, and its outlet end is connected to an external waste treatment system.

7. The clamping device for optical lens polishing according to claim 2, characterized in that: The extension and retraction stroke of the elastic limiting post (373) is adjusted by a micro pneumatic actuator embedded in the clamping base (371).

8. The clamping device for optical lens polishing according to claim 3, characterized in that: The swing angle range of the swing arm (42) is 30° to 120°.

Images