A fixture for optical lens surface detection

Abstract

The application relates to the technical field of optical lenses and discloses a fixing device for optical lens surface detection, which comprises a box body, a bearing seat fixedly connected to the inner bottom surface of the box body, a main shaft vertically penetrating the inside of the bearing seat, a clamping disc fixedly installed at the top end of the main shaft, a flange plate fixedly connected to the outer wall of the main shaft, an arc blank placed on the top surface of the clamping disc, a weight adjusting unit connected to the bottom surface of the clamping disc, and the weight adjusting unit being coaxially fixed to the flange plate with the main shaft. The weight adjusting unit comprises a liquid counterweight wheel fixedly connected to the bottom surface of the clamping disc, and a plurality of radial partition plates fixedly connected to the inside of the liquid counterweight wheel. The multiple independent counterweight cavities of the weight adjusting unit selectively fill the counterweight liquid through a micro gear pump, the overall gravity center of the counterweight liquid is adjusted to any azimuth angle in the rotary plane, and the imbalance caused by the gravity center of the rigid counterweight block deviating from the rotary axis under high-speed rotation is avoided.

Description

Technical Field

[0001] This invention belongs to the field of optical lens technology, and specifically relates to a fixing device for surface inspection of optical lenses. Background Technology

[0002] After the grinding process, optical-grade thin-walled curved blanks require surface quality inspection of the outer curved surface to identify radial microcracks with a width of only a few micrometers. Existing inspection devices use a rotary spindle to drive a three-jaw chuck to hold the blank in rotation, while a side-view array camera acquires images of the unfolded outer curved surface under front illumination.

[0003] Existing defect detection devices for thin-walled curved blanks mainly consist of a light source module, an image acquisition unit, and a single radial rigid slider counterweight mechanism. They typically employ frontal transmission or reflection modes for microcrack detection. Before detection, the light source provides frontal illumination at a fixed angle. During detection, the basic illumination is maintained primarily by ambient light or a fixed light source. There is a lack of active, high-contrast optical excitation methods specifically for the characteristics of curved surface microcracks. Because there is almost no contrast between the microcracks and the curved surface body in the frontal illumination mode, the crack signal is submerged in the background light, leading to missed detections, resulting in low detection yield and system misjudgments. Furthermore, a single radial rigid slider is typically used in the rotating detection station. Since the center of gravity of the curved blank is significantly deviated from the geometric center, periodic vibrations occur during rotation. The single radial rigid slider can only compensate along a fixed radial line and cannot compensate for the eccentricity at any azimuth angle. Moreover, the rigid slider itself generates secondary imbalance under high-speed rotation, exacerbating system vibration and easily causing stripe artifacts and false alarms in dark field progressive stitched images. Summary of the Invention

[0004] This invention provides a fixing device for the inspection of optical lens surfaces, which solves the technical problems in related technologies, such as the periodic vibration caused by eccentricity during the rotational inspection of thin-walled arc-shaped blanks, resulting in dark-field imaging artifacts, and the lack of contrast in micron-level microcracks under front illumination, leading to missed detection.

[0005] This invention provides a fixing device for inspecting the surface of optical lenses, comprising: a housing. The bearing housing is fixedly connected to the inner bottom surface of the housing; The main shaft is vertically inserted inside the bearing housing; The clamping plate is fixedly installed on the top of the spindle. A flange is fixedly connected to the outer wall of the spindle, and a clamping unit is connected inside the clamping plate. The curved blank is placed on the top surface of the clamping plate; The bottom surface of the clamping plate is connected to a weight adjustment unit. The weight adjustment unit is coaxially fixed to the flange with the main shaft. The weight adjustment unit includes a liquid counterweight wheel. The liquid counterweight wheel is fixedly connected to the bottom surface of the clamping plate. Multiple radial baffles are fixedly connected inside the liquid counterweight wheel. The six radial baffles are equidistant from each other. The liquid counterweight wheel has six counterweight cavities opened through the radial baffles. The box is connected to an annular oblique projection unit, which is coaxially arranged with the main shaft. The optical axis of the light source is evenly distributed around the circumference, pointing to the center of rotation and forming a downward angle with the horizontal plane. A horizontal cantilever is fixedly connected to the inside of the housing. A line scan camera is fixedly connected to one end of the horizontal cantilever near the main shaft. The lens axis of the line scan camera is vertically oriented towards the center of rotation.

[0006] In a preferred embodiment, a micro gear pump is connected to the inner wall of the counterweight chamber via a pipeline, the output end of the micro gear pump is connected to a micro pipeline, and a sealed liquid storage tank is fixedly connected to the end of the micro pipeline away from the micro gear pump. A drive unit is connected to the inner bottom surface of the housing. The drive unit includes a servo motor, which is fixedly connected to the inner bottom surface of the housing by bolts. The servo motor is offset to one side of the spindle. The output end of the servo motor is fixedly connected to a drive wheel. A driven wheel is fixedly connected to the outer wall of the spindle. A synchronous belt is sleeved between the outer walls of the drive wheel and the driven wheel. The drive wheel and the driven wheel form a circular transmission circuit in the horizontal direction through the synchronous belt, which transmits the rotational torque of the servo motor to the spindle.

[0007] In a preferred embodiment, the clamping unit includes a worm gear rotatably connected to the inside of a clamping disk. The inside of the clamping disk has three radially evenly distributed guide rails, and jaws are slidably connected inside the radial guide rails. The inside of the clamping disk has a spiral groove rotatably connected to the inside, with the spiral groove located on one side of the worm gear and the input end of the spiral groove located on the circumferential side of the clamping disk. The top surface of the worm gear has three spiral grooves, and the bottom surface of the jaws is fixedly connected to pins. The pins of the three jaws, each pendant, are constrained by the spiral grooves. When the worm gear rotates, the spiral grooves push the three pins to move synchronously radially, causing the three jaws to synchronously close or open radially.

[0008] In a preferred embodiment, a silicone pad is fixedly connected to one side of each of the three grippers, and the silicone pad contacts the surface of the curved blank in a flexible fit to disperse the clamping force.

[0009] In a preferred embodiment, the center of the main shaft has an axially penetrating inner hole, and a sealed liquid storage tank is fixed to the inner hole wall by a retaining ring, and the sealed liquid storage tank stores counterweight liquid. Multiple micro gear pumps are connected to a sealed liquid storage tank via a radial micro-pipeline. The micro-pipeline extends radially from the side wall of the counterweight chamber toward the center of the linear array camera and connects to the sealed liquid storage tank. The micro gear pump is fixed to the boss on the outer wall of the liquid counterweight wheel and rotates as a whole with the main shaft. When the micro gear pump rotates forward, it draws the counterweight liquid in the micro pipeline into the corresponding counterweight chamber. When it rotates in reverse, it draws the counterweight liquid in the counterweight chamber back into the micro pipeline.

[0010] In a preferred embodiment, the liquid counterweight wheel is divided into six independent counterweight chambers along the axial direction by six radial baffles, and six micro gear pumps are evenly distributed and fixed on the outer wall protrusions of the liquid counterweight wheel in the circumferential direction, with the center angle between adjacent counterweight chambers being 60 degrees.

[0011] In a preferred embodiment, the annular oblique projection unit includes radial connecting arms. Three radial connecting arms are fixedly connected to the inner wall of the housing. The three radial connecting arms are evenly distributed along the circumference. An annular bracket is fixedly connected between the three radial connecting arms. The annular bracket is arranged coaxially with the main shaft. The inner diameter of the annular bracket is larger than the outer diameter of the rotational envelope of the arc-shaped blank. Multiple sets of LED light groups are fixedly connected to the inner wall of the annular bracket.

[0012] In a preferred embodiment, the downward tilt angle between the optical axis of the LED light group and the horizontal plane is an acute angle, and the angle between the optical axis of the line scan camera and the optical axis of the LED light group is greater than an acute angle.

[0013] In a preferred embodiment, a rotating cover is rotatably connected to the top surface of the housing, and an electric rod is connected between the housing and the rotating cover. The electric rod and the housing or the electric rod and the rotating cover are rotatably connected by a shaft.

[0014] In a preferred embodiment, a triaxial acceleration sensor is fixedly connected to the end face of the flange. The signal line of the triaxial acceleration sensor and the power line of the micro gear pump are led out along the central inner hole of the main shaft towards the bearing seat. A conductive slip ring is provided at one end of the main shaft near the bearing seat. A control cabinet is fixedly connected to the right side of the housing. The rotor ring of the bearing seat is fixed to the main shaft and rotates with it. The stator ring is fixedly connected to the control cabinet through a bracket.

[0015] The beneficial effects of this invention are as follows: 1. This invention selectively fills multiple independent counterweight chambers of the weight adjustment unit with counterweight liquid via a micro gear pump, which can adjust the overall center of gravity of the counterweight liquid to any azimuth angle within the plane of rotation, thereby achieving two-dimensional vector compensation for the eccentricity of the arc-shaped blank in any direction. The counterweight liquid is a flowable liquid medium that is uniformly distributed in the cavity space within each counterweight chamber. During the compensation process, no rigid slider-type local mass concentration is introduced, thus avoiding the secondary imbalance caused by the rigid counterweight block deviating from the axis of rotation under high-speed rotation. 2. In this invention, the light is incident at a small angle onto the outer surface of the arc surface through an annular oblique projection unit. The angle between the specular reflection direction of the oblique light on the smooth surface and the optical axis of the line scan camera is greater than 75°. The specular reflected light does not enter the field of view of the line scan camera, forming a dark background. Due to the microscopic discontinuity, the microcrack interface scatters the oblique light into multi-directional signals. The scattering component towards the line scan camera is received by the line scan camera, making the crack appear as a bright line against the dark background. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a front view sectional structural schematic diagram of the present invention.

[0018] Figure 3 This is the present invention. Figure 2 A schematic diagram of the structure viewed in section AA.

[0019] Figure 4 This is the present invention. Figure 2 Enlarged structural diagram at point B.

[0020] Figure 5 This is a schematic diagram of the cross-sectional structure of the present invention (right view).

[0021] Figure 6 This is the present invention. Figure 5 Enlarged structural diagram at point C.

[0022] Figure 7 This is a schematic diagram of the clamping disk connection structure of the present invention.

[0023] Figure 8 This is a schematic diagram of the connection structure of the drive unit of the present invention.

[0024] Figure 9 This is a schematic diagram of the weight adjustment unit structure of the present invention.

[0025] Figure 10 This is a schematic diagram of the synchronous clamping unit structure of the present invention.

[0026] In the diagram: 1. Housing; 2. Rotating cover; 3. Electric rod; 4. Horizontal cantilever; 5. Linear scan camera; 6. Spindle; 7. Clamping unit; 71. Worm gear; 72. Pin; 73. Worm; 74. Spiral groove; 75. Gripper; 76. Silicone pad; 77. Radial guide rail; 8. Clamping plate; 9. Curved blank; 10. Control cabinet; 11. Conductive slip ring; 12. Weight adjustment unit; 121. Liquid counterweight wheel; 122. Radial... 123. Baffle plate; 124. Counterweight chamber; 125. Miniature gear pump; 126. Miniature pipeline; 127. Sealed liquid storage tank; 13. Annular oblique injection unit; 131. Annular bracket; 132. LED light group; 133. Radial connecting arm; 14. Flange; 15. Bearing housing; 16. Drive unit; 161. Servo motor; 162. Drive wheel; 163. Synchronous belt; 164. Driven wheel; 17. Triaxial acceleration sensor. Detailed Implementation

[0027] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0028] like Figure 1-10 As shown, a fixing device for inspecting the surface of an optical lens, housing 1 The bearing housing 15 is fixedly connected to the inner bottom surface of the housing 1; The main shaft 6 is vertically inserted inside the bearing housing 15; The clamping plate 8 is fixedly installed on the top of the spindle 6. The outer wall of the spindle 6 is fixedly connected to the flange 14, and the clamping unit 7 is connected inside the clamping plate 8. The curved blank 9 is placed on the top surface of the clamping plate 8; The bottom surface of the clamping plate 8 is connected to a weight adjustment unit 12. The weight adjustment unit 12 is coaxially fixed to the flange 14 with the main shaft 6. The weight adjustment unit 12 includes a liquid counterweight wheel 121. The liquid counterweight wheel 121 is fixedly connected to the bottom surface of the clamping plate 8. Multiple radial partitions 122 are fixedly connected inside the liquid counterweight wheel 121. The six radial partitions 122 are equidistant from each other. Six counterweight cavities 123 are opened inside the liquid counterweight wheel 121 through the radial partitions 122. The interior of the housing 1 is connected to an annular oblique projection unit 13, and the annular oblique projection unit 13 is arranged coaxially with the main shaft 6. The optical axis of the light source is evenly distributed around the circumference, pointing to the center of rotation and forming a downward angle with the horizontal plane. A horizontal cantilever 4 is fixedly connected to the inside of the housing 1. A line scan camera 5 is fixedly connected to one end of the horizontal cantilever 4 near the main shaft 6. The lens axis of the line scan camera 5 is vertically oriented towards the rotation center. It should be noted that the housing 1 provides an overall support reference. The main shaft 6 is vertically inserted into the bearing seat 15 of the housing 1. The flange 14 is used for the fixed connection between the main shaft 6 and the clamping plate 8. The clamping unit 7 is set inside the clamping plate 8 to fix the curved blank 9, which facilitates the stability test of the curved blank 9 by the testing structure. The interior of the weight adjustment unit 12 is divided into multiple independent counterweight cavities 123 along the circumference by multiple radial partitions 122. Each radial partition 122 is welded and fixed to the inner wall of the weight adjustment unit 12. Extending radially to the inner ring wall of the weight adjustment unit 12, a counterweight cavity 123 is set inside the liquid counterweight wheel 121 to store counterweight material and to keep the clamping disk 8 stable during rotation. An annular oblique illumination unit 13 is set as a dark field annular oblique illumination light source. The dark field annular oblique illumination light source is obliquely incident on the outer surface of the arc surface at a small angle, so that the crack appears as a bright line against the dark background. Due to the microscopic discontinuity of the microcrack interface, the oblique illumination light is scattered into multi-directional signals, among which the scattering component toward the direction of the line scan camera 5 is received by the line scan camera 5.

[0029] like Figure 3 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, a micro gear pump 124 is connected to the inner wall of the counterweight chamber 123 via a pipeline. The output end of the micro gear pump 124 is connected to a micro pipeline 125. A sealed liquid storage tank 126 is fixedly connected to the end of the micro pipeline 125 away from the micro gear pump 124. A drive unit 16 is connected to the inner bottom surface of the housing 1. The drive unit 16 includes a servo motor 161. The servo motor 161 is fixedly connected to the inner bottom surface of the housing 1 by bolts. The servo motor 161 is offset to one side of the spindle 6. The output end of the servo motor 161 is fixedly connected to a drive wheel 162. The outer wall of the spindle 6 is fixedly connected to a driven wheel 164. A synchronous belt 163 is sleeved between the outer walls of the drive wheel 162 and the driven wheel 164. The drive wheel 162 and the driven wheel 164 form a circular transmission circuit in the horizontal direction through the synchronous belt 163, which transmits the rotational torque of the servo motor 161 to the spindle 6. It should be noted that by selectively injecting counterweight liquid into the counterweight chamber 123 at a specific orientation and withdrawing the counterweight liquid from the counterweight chamber 123 at the opposite orientation, the mass distribution of the counterweight liquid in each counterweight chamber 123 is changed, causing the overall center of gravity of the counterweight liquid to deviate towards a specified azimuth angle in the plane of rotation. This generates a reverse compensating torque on the eccentricity of the arc-shaped blank 9. The servo motor 161 is securely mounted on the inner bottom surface of the housing 1 with bolts. When the equipment is running, the servo motor 161 starts, and its output end begins to rotate, driving the drive wheel 162 to rotate synchronously. A synchronous belt 163 is fitted between the drive wheel 162 and the driven wheel 164 mounted on the outer wall of the main shaft 6. The two form a closed annular transmission circuit in the horizontal plane through the synchronous belt. When the drive wheel 162 rotates, the synchronous belt 163 smoothly transmits the rotational torque to the driven wheel 164. After receiving the torque, the driven wheel 164 starts to rotate. Since the driven wheel 164 is fixedly connected to the outer wall of the main shaft 6, the driven wheel 164 drives the main shaft 6 to rotate synchronously, thereby completing the drive of the core components inside the housing.

[0030] like Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 10 As shown, the clamping unit 7 includes a worm gear 71, which is rotatably connected to the inside of the clamping disk 8. The inside of the clamping disk 8 is provided with three radial guide rails 77 evenly distributed along the circumference. The inside of the radial guide rails 77 is slidably connected with jaws 75. The inside of the clamping disk 8 is rotatably connected with a spiral groove 74, which is located on one side of the worm gear 71. The input end of the spiral groove 74 is located on the circumferential side of the clamping disk 8. The top surface of the worm gear 71 is provided with three spiral grooves 74. The bottom surface of the jaws 75 is fixedly connected with pins 72. The pins 72 of the three jaws 75 are each inserted into the corresponding spiral grooves 74 and are constrained by the spiral grooves 74. When the worm gear 71 rotates, the spiral grooves 74 push the three pins 72 to move synchronously along the radial direction, so that the three jaws 75 synchronously close or open along the radial direction. It should be noted that the clamping disc 8 is fixed to the end face of the flange 14 away from the bearing seat 15 by bolts. The disc surface of the clamping disc 8 is provided with three radial guide rails 77 evenly distributed circumferentially. The three jaws 75 are respectively slidably disposed in the three radial guide rails 77, and each jaw 75 slides linearly along its respective radial guide rail 77. The clamping disc 8 is provided with a worm gear synchronization mechanism, which includes a worm 73 and a worm wheel 71. The input end of the worm 73 is located on the circumferential side of the clamping disc 8. The worm 73 rotates... When the worm gear 71 rotates, it drives the worm wheel 71 to rotate. The worm wheel 71 has three spiral grooves 74 on its disc surface. The pins 72 of the three jaws 75 extend into the corresponding spiral grooves 74 and are constrained by the spiral grooves 74. When the worm wheel 71 rotates, the spiral grooves 74 push the three pins 72 to move synchronously in the radial direction, so that the three jaws 75 synchronously close or open in the radial direction, clamping or releasing the two short sides of the arc blank 9. The worm wheel and worm gear pair has a self-locking characteristic. After the jaws 75 close, they will not loosen in the opposite direction due to external force during rotation.

[0031] like Figure 7 As shown, silicone pads 76 are fixedly connected to one side of each of the three grippers 75. The silicone pads 76 contact the surface of the curved blank 9 in a flexible fit to disperse the clamping force. It should be noted that each gripper 75 has a silicone pad 76 attached to its end. The silicone pad 76 contacts the surface of the curved blank 9 in a flexible manner, dispersing the clamping force and avoiding damage to the surface of the blank from rigid contact.

[0032] like Figure 4 , Figure 6 and Figure 9 As shown, the center of the main shaft 6 has an inner hole that runs through it along the axial direction. The sealed liquid storage tank 126 is fixed to the inner hole wall by a retaining ring. The sealed liquid storage tank 126 stores counterweight liquid. Multiple micro gear pumps 124 are respectively connected to the sealed liquid storage tank 126 via a radial micro pipeline 125. The micro pipeline 125 extends radially from the side wall of the counterweight chamber 123 toward the center of the linear array camera 5 and connects to the sealed liquid storage tank 126. The micro gear pump 124 is fixed to the outer wall boss of the liquid counterweight wheel 121 and rotates as a whole with the main shaft 6. When the micro gear pump 124 rotates forward, it draws the counterweight liquid in the micro pipeline 125 into the corresponding counterweight chamber 123. When it rotates in reverse, it draws the counterweight liquid in the counterweight chamber 123 back into the micro pipeline 125. It should be noted that by setting a retaining ring to fix the sealed liquid storage tank 126 to the inner wall of the main shaft 6, the stability of the sealed liquid storage tank 126 during the rotation of the main shaft 6 is maintained, preventing the sealed liquid storage tank 126 from sliding up and down due to centrifugal force. This prevents the sealed liquid storage tank 126 from compressing the micro-tube 125 and reducing the liquid transfer speed when sliding up and down. By setting the micro gear pump 124 to the outer wall boss of the liquid counterweight wheel 121, it is easy to install and to conduct regular inspection and maintenance of the micro gear pump 124. By matching the number and position of the micro gear pump 124, micro-tube 125 and counterweight chamber 123, the path length of the micro-tube 125 is consistent, and the speed is the same when dispensing liquid. This ensures that when liquid needs to be delivered into the counterweight chamber 123, it can respond quickly and synchronously, improving the accuracy of the weight adjustment unit 12.

[0033] like Figure 4 and Figure 9 As shown, the liquid counterweight wheel 121 is divided into six independent counterweight chambers 123 along the axial direction by six radial baffles 122. Six micro gear pumps 124 are evenly distributed and fixed on the outer wall protrusion of the liquid counterweight wheel 121 along the circumference. The center angle interval between adjacent counterweight chambers 123 is sixty degrees. It should be noted that the weight adjustment unit 12 is divided into six independent counterweight chambers 123 along the circumference by six radial partitions 122. Six micro gear pumps 124 are evenly distributed and fixed on the outer wall protrusions of the weight adjustment unit 12 along the circumference. The inlet of each micro gear pump 124 is connected to the sealed liquid storage tank 126 via a pipeline, and the outlet is connected to the corresponding counterweight chamber 123 via a micro pipeline 125. The six counterweight chambers 123 cover a complete 360° range in the circumference. The central angle interval between adjacent counterweight chambers 123 is 60°, so that by combining and adjusting the liquid volume of adjacent counterweight chambers 123, a compensation eccentric vector with any azimuth angle can be synthesized in the plane of rotation.

[0034] like Figure 1 , Figure 6 and Figure 7 As shown, the annular oblique projection unit 13 includes radial connecting arms 133. Three radial connecting arms 133 are fixedly connected to the inner wall of the housing 1. The three radial connecting arms 133 are evenly distributed along the circumference. An annular bracket 131 is fixedly connected between the three radial connecting arms 133. The annular bracket 131 is coaxially arranged with the main shaft 6. The inner diameter of the annular bracket 131 is larger than the outer diameter of the rotational envelope of the arc-shaped blank 9. Multiple sets of LED light groups 132 are fixedly connected to the inner wall of the annular bracket 131. It should be noted that the optical axis of each LED light group 132 points to the center of rotation and forms a downward tilt angle with the horizontal plane, so that the beam enters the outer surface of the clamped curved blank 9 at a small angle. By setting multiple sets of LED light groups 132 and the interior of the ring bracket 131, the illumination range and illumination quality of the multiple sets of LED light groups 132 are guaranteed. Three radial connecting arms 133 are set to fix the ring bracket 131, ensuring the stability of the ring bracket 131 and preventing the ring bracket 131 from shifting due to external force during use due to weight, which would cause the illumination angle to fail to achieve the desired effect.

[0035] like Figure 1 , Figure 6 and Figure 7 As shown, the angle between the optical axis of LED light group 132 and the downward tilt of the horizontal plane is an acute angle, and the angle between the optical axis of line scan camera 5 and the optical axis of LED light group 132 is greater than the acute angle. It should be noted that the downward tilt angle between the optical axis of the LED light assembly 132 and the horizontal plane is 15°, and a radial safety clearance of not less than 10mm is maintained between the inner diameter of the annular bracket 131 and the outer diameter of the rotating envelope of the clamping disk 8 to avoid interference between the rotating parts and the fixed annular bracket 131. like Figure 1 and Figure 2 As shown, a rotating cover 2 is rotatably connected to the top surface of the box 1, and an electric rod 3 is connected between the box 1 and the rotating cover 2. The electric rod 3 and the box 1 or the electric rod 3 and the rotating cover 2 are rotatably connected by a shaft. It should be noted that when this device is needed, the electric lever 3 needs to be activated to push the rotating cover 2 so that the rotating cover 2 is separated from the box 1, which makes it easier for the staff to place the curved blank 9 on the surface of the clamping plate 8 for testing.

[0036] like Figure 1 , Figure 8 and Figure 9 As shown, a triaxial acceleration sensor 17 is fixedly connected to the end face of the flange 14. The signal line of the triaxial acceleration sensor 17 and the power line of the micro gear pump 124 are led out along the central inner hole of the main shaft 6 towards the bearing seat 15. A conductive slip ring 11 is provided at one end of the main shaft 6 near the bearing seat 15. A control cabinet 10 is fixedly connected to the right side of the housing 1. The rotor ring of the bearing seat 15 is fixed to the main shaft 6 and rotates with it. The stator ring is fixedly connected to the control cabinet 10 through a bracket. It should be noted that, in order to achieve real-time detection and dynamic compensation of the unbalance vector under rotation, a triaxial accelerometer 17 is embedded in the end face of the flange 14. The signal line of the triaxial accelerometer 17 and the power line of each micro gear pump 124 are led out along the central inner hole of the main shaft 6 towards the bearing seat 15. At the end of the main shaft 6 near the bearing seat 15, it is transferred to the control cabinet 10 fixed outside the housing 1 through a conductive slip ring 11. The rotor ring of the conductive slip ring 11 is fixed to the main shaft 6 and rotates with it, while the stator ring is fixed to the housing 1 by a bracket to remain stationary, thereby realizing the transmission of electrical signals and power between the rotating and stationary parts. The control cabinet 10 receives the vibration signal fed back by the triaxial accelerometer 17, calculates the amplitude and phase angle of the unbalance vector, and drives the micro gear pump 124 in the corresponding position to pump the counterweight liquid, thereby realizing closed-loop dynamic balance compensation.

[0037] Working principle: When it is necessary to inspect the surface of an optical lens, first start the electric lever 3 to push the rotating cover 2 to separate from the box 1, open the top of the equipment, and then the staff will place the curved blank 9 to be inspected on the top surface of the clamping plate 8 to complete the loading preparation work. The worm gear 73 is driven to rotate by the input end on the side of the clamping disk 8, which in turn drives the worm wheel 71 inside the clamping disk 8 to rotate. When the worm wheel 71 rotates, the three spiral grooves 74 on its disk surface push the pins 72 at the bottom of the three jaws 75 to move synchronously in the radial direction, so that the three jaws 75 can retract synchronously along the radial guide rail 77. The silicone pads 76 at the ends of the jaws 75 contact and clamp the arc-shaped blank 9 in a flexible fit. The self-locking characteristics of the worm gear ensure that the clamping is stable and does not damage the surface of the blank. The servo motor 161 is started, and its output drives the drive wheel 162 to rotate. The rotational torque is smoothly transmitted to the driven wheel 164 through the synchronous belt 163, which in turn drives the main shaft 6 and the clamping plate 8 to rotate synchronously. During the rotation, multiple sets of LED lights 132 on the annular oblique projection unit 13 project beams into the outer surface of the arc-shaped blank 9 at a small angle, forming dark field illumination. Defects such as microcracks appear as bright lines due to scattering, which are received by the linear array camera 5 that is vertically oriented towards the center of rotation, completing the scanning and detection of surface quality. During the high-speed rotation of the main shaft 6, the vibration caused by the eccentricity of the arc-shaped blank 9 is detected in real time by the triaxial acceleration sensor 17. This signal is transmitted to the control cabinet 10 through the line led out from the central inner hole of the main shaft 6 and the conductive slip ring 11 (the rotor ring rotates with the main shaft, while the stator ring remains stationary). The control cabinet 10 processes the vibration signal and drives the micro gear pump 124 in the corresponding position to work according to the vibration signal. When the micro gear pump 124 rotates forward, it draws the counterweight liquid in the sealed storage tank 126 into the counterweight cavity 123 in a specific position through the micro pipeline 125. At the same time, it draws the counterweight liquid in the counterweight cavity 123 in the opposite position back to the sealed storage tank 126, changing the weight distribution of the counterweight liquid in each counterweight cavity 123 and generating a reverse compensation torque for the eccentricity of the arc-shaped blank 9. This achieves closed-loop dynamic balance compensation in the rotation state and ensures the stability of the detection process.

[0038] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A fixing device for inspecting the surface of an optical lens, characterized in that, include: Box (1) The bearing housing (15) is fixedly connected to the inner bottom surface of the housing (1); The main shaft (6) is vertically inserted inside the bearing housing (15); A clamping disc (8) is fixedly installed on the top of the spindle (6). A flange (14) is fixedly connected to the outer wall of the spindle (6). A clamping unit (7) is connected inside the clamping disc (8). The curved blank (9) is placed on the top surface of the clamping plate (8); The bottom surface of the clamping plate (8) is connected to a weight adjustment unit (12). The weight adjustment unit (12) is coaxially fixed to the flange (14) with the main shaft (6). The weight adjustment unit (12) includes a liquid counterweight wheel (121). The liquid counterweight wheel (121) is fixedly connected to the bottom surface of the clamping plate (8). Multiple radial partitions (122) are fixedly connected inside the liquid counterweight wheel (121). The six radial partitions (122) are equidistant from each other. Six counterweight cavities (123) are opened inside the liquid counterweight wheel (121) through the radial partitions (122). The box (1) is connected to an annular oblique projection unit (13), and the annular oblique projection unit (13) is arranged coaxially with the main shaft (6). The optical axis of the light source is evenly distributed around the circumference, pointing to the center of rotation and forming a downward angle with the horizontal plane. A horizontal cantilever (4) is fixedly connected to the inside of the housing (1). A line array camera (5) is fixedly connected to one end of the horizontal cantilever (4) near the main shaft (6). The lens axis of the line array camera (5) is vertically oriented toward the rotation center.

2. The fixing device for optical lens surface inspection according to claim 1, characterized in that: The inner wall of the counterweight chamber (123) is connected to a micro gear pump (124) via a pipeline. The output end of the micro gear pump (124) is connected to a micro pipeline (125). The end of the micro pipeline (125) away from the micro gear pump (124) is fixedly connected to a sealed liquid storage tank (126). The inner bottom surface of the housing (1) is connected to a drive unit (16), which includes a servo motor (161). The servo motor (161) is fixedly connected to the inner bottom surface of the housing (1) by bolts. The servo motor (161) is offset to one side of the main shaft (6). The output end of the servo motor (161) is fixedly connected to a drive wheel (162). The outer wall of the main shaft (6) is fixedly connected to a driven wheel (164). A synchronous belt (163) is sleeved between the outer walls of the drive wheel (162) and the driven wheel (164). The drive wheel (162) and the driven wheel (164) form a circular transmission circuit in the horizontal direction through the synchronous belt (163) to transmit the rotational torque of the servo motor (161) to the main shaft (6).

3. The fixing device for optical lens surface inspection according to claim 1, characterized in that: The clamping unit (7) includes a worm gear (71), which is rotatably connected to the inside of the clamping disk (8). The clamping disk (8) has three radially evenly distributed guide rails (77) inside. Grippers (75) are slidably connected inside the radial guide rails (77). A spiral groove (74) is rotatably connected inside the clamping disk (8). The spiral groove (74) is located on one side of the worm gear (71), and the input end of the spiral groove (74) is located at... On the circumferential side of the clamping disc (8), the top surface of the worm gear (71) is provided with three spiral grooves (74), and the bottom surface of the gripper (75) is fixedly connected with pins (72). The pins (72) of the three grippers (75) are each inserted into the corresponding spiral grooves (74) and are constrained by the spiral grooves (74). When the worm gear (71) rotates, the spiral grooves (74) push the three pins (72) to move synchronously in the radial direction, so that the three grippers (75) synchronously close or open in the radial direction.

4. The fixing device for optical lens surface inspection according to claim 3, characterized in that: A silicone pad (76) is fixedly connected to one side of each of the three grippers (75). The silicone pad (76) contacts the surface of the curved blank (9) in a flexible fit to disperse the clamping force.

5. A fixing device for inspecting the surface of an optical lens according to claim 2, characterized in that: The main shaft (6) has an axially penetrating inner hole at its center. The sealed liquid storage tank (126) is fixed to the inner hole wall by a retaining ring. The sealed liquid storage tank (126) stores counterweight liquid. Multiple micro gear pumps (124) are respectively connected to a sealed liquid storage tank (126) via a radial micro pipeline (125). The micro pipeline (125) extends radially from the side wall of the counterweight chamber (123) towards the center of the linear array camera (5) and connects to the sealed liquid storage tank (126). The micro gear pump (124) is fixed to the outer wall boss of the liquid counterweight wheel (121) and rotates as a whole with the main shaft (6). When the micro gear pump (124) rotates forward, it draws the counterweight liquid in the micro pipeline (125) into the corresponding counterweight chamber (123). When it rotates in reverse, it draws the counterweight liquid in the counterweight chamber (123) back into the micro pipeline (125).

6. The fixing device for optical lens surface inspection according to claim 5, characterized in that: The liquid counterweight wheel (121) is divided into six independent counterweight chambers (123) along the axial direction by six radial partitions (122). Six micro gear pumps (124) are evenly distributed and fixed on the outer wall protrusion of the liquid counterweight wheel (121) along the circumference. The center angle interval between adjacent counterweight chambers (123) is sixty degrees.

7. The fixing device for optical lens surface inspection according to claim 1, characterized in that: The annular oblique projection unit (13) includes radial connecting arms (133). Three radial connecting arms (133) are fixedly connected to the inner wall of the housing (1). The three radial connecting arms (133) are evenly distributed along the circumference. An annular bracket (131) is fixedly connected between the three radial connecting arms (133). The annular bracket (131) is coaxially arranged with the main shaft (6). The inner diameter of the annular bracket (131) is larger than the outer diameter of the rotational envelope of the arc-shaped blank (9). Multiple sets of LED light groups (132) are fixedly connected to the inner wall of the annular bracket (131).

8. A fixing device for inspecting the surface of an optical lens according to claim 7, characterized in that, The angle between the optical axis of the LED light group (132) and the downward tilt of the horizontal plane is an acute angle, and the angle between the optical axis of the line array camera (5) and the optical axis of the LED light group (132) is greater than an acute angle.

9. A fixing device for inspecting the surface of an optical lens according to claim 8, characterized in that, The top surface of the box (1) is rotatably connected to a rotating cover (2), and an electric rod (3) is connected between the box (1) and the rotating cover (2). The electric rod (3) and the box (1) or the electric rod (3) and the rotating cover (2) are rotatably connected by a shaft.

10. A fixing device for inspecting the surface of an optical lens according to claim 1, characterized in that: A triaxial acceleration sensor (17) is fixedly connected to the end face of the flange (14). The signal line of the triaxial acceleration sensor (17) and the power line of the micro gear pump (124) are led out along the central inner hole of the main shaft (6) towards the bearing seat (15). A conductive slip ring (11) is provided at one end of the main shaft (6) near the bearing seat (15). A control cabinet (10) is fixedly connected to the right side of the housing (1). The rotor ring of the bearing seat (15) is fixed to the main shaft (6) and rotates with it. The stator ring is fixedly connected to the control cabinet (10) through a bracket.

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