A device for measuring the flatness of large-size optical glass

Abstract

The present invention discloses a device for measuring the flatness of large-scale optical glass, which relates to the field of optical glass flatness measurement. The device includes a positioning platform, a bearing assembly and a direction-changing assembly fixedly mounted on the upper surface of the positioning platform, the direction-changing assembly being perpendicular to the bearing assembly, and a scanning assembly movably connected to the top of the direction-changing assembly. The scanning assembly includes a support rod, a connecting block fixedly mounted on the bottom of the support rod, and a tri-fold plate rotatably connected to the bottom of the connecting block. The present invention achieves horizontal feeding through a rack and pinion transmission, utilizes a spiral groove mechanism to convert rotational motion into compound motion in a vertical plane, and combines the angle and position control of the light emitter by a servo motor to ultimately achieve high-precision, full-area scanning of large-scale optical glass surfaces. Its core advantage lies in the simplification of two-dimensional motion control through mechanical structure design, which improves measurement efficiency and stability and is suitable for large-scale flatness detection scenarios.

Description

Technical Field

[0001] The present invention relates to the technical field of optical glass flatness measurement, and in particular to a device for measuring the flatness of large-size optical glass. Background Art

[0002] Optical glass flatness measurement refers to the technical process of accurately measuring and evaluating the flatness of the optical glass surface.

[0003] However, in existing technologies, when inspecting the flatness of large-sized optical glass, it is impossible to directly obtain full-surface data because the single effective measurement area of ​​conventional high-precision measuring instruments is much smaller than the size of the glass being measured. In particular, laser scanning profilometers obtain surface profiles through linear scanning, and their probe arm length is limited (conventional models ≤1.5 meters), which cannot meet the needs of large-scale rapid inspection. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for measuring the flatness of large-scale optical glass to solve the problem that the laser scanning profilometer proposed in the above background technology obtains the surface profile through linear scanning, and its probe arm length is limited (conventional models ≤1.5 meters), which cannot meet the needs of large-scale rapid detection.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a device for measuring the flatness of large-scale optical glass, comprising a positioning platform, a bearing assembly and a direction-changing assembly fixedly mounted on the upper surface of the positioning platform, the direction-changing assembly being perpendicular to the bearing assembly, and a scanning assembly being movably connected to the top of the direction-changing assembly;

[0006] The scanning assembly includes a support rod, a connecting block is fixedly installed at the bottom of the support rod, a three-fold plate is rotatably connected to the bottom of the connecting block, connecting rods are fixedly installed on the lower surfaces of both ends of the three-fold plate, a first servo motor is fixedly installed on the top of the support rod, the output end of the first servo motor is fixedly connected to the connecting plate, an arc-shaped gear rod is slidably connected to one side of the connecting plate, and a light emitter is fixedly installed on one end of the arc-shaped gear rod;

[0007] The direction-changing component comprises a cylinder, the surface of which is provided with staggered and interconnected spiral grooves, and a connecting rod is slidably connected to the inner side of the spiral grooves.

[0008] Preferably, the bearing assembly includes positioning blocks, which are fixedly mounted on both ends of the upper surface of the positioning platform, a first guide rod is fixedly mounted between the two positioning blocks, a bearing plate is sleeved on the outer wall of the first guide rod, and a rack is fixedly mounted on the lower surface of the bearing plate.

[0009] Preferably, the direction-changing assembly includes an arch bracket and a reduction motor, the reduction motor is located at one end of the arch bracket, the output shaft of the reduction motor is fixedly connected to a transmission rod, a limiting cylinder is fixedly installed on the upper surface of the positioning platform, and the transmission rod is rotatably installed inside the limiting cylinder.

[0010] Preferably, gears are fixedly mounted on the outer wall and end of the transmission rod body, the transmission rod is located at the bottom of the arch bracket, and the transmission rod is meshed with the rack on the lower surface of the supporting plate through the provided gears.

[0011] Preferably, a limit block is fixedly installed on the other end of the arch bracket, a double-headed gear shaft is rotatably installed inside the limit block, and one end of the double-headed gear shaft is meshed with the gear at the end of the transmission rod.

[0012] Preferably, the cylinder is rotatably mounted on the top of the arch bracket, a bevel gear is fixedly mounted on one end of the cylinder, and one end of the bevel gear is meshedly connected with the double-headed gear shaft.

[0013] Preferably, a second guide rod is fixedly mounted on the top of the arch bracket, the second guide rod is slidably connected to the connecting block, and the second guide rod is located above the cylinder.

[0014] Preferably, a second servo motor is fixedly mounted on the other side of the connecting plate, and an output end of the second servo motor is fixedly connected to a connecting gear, which is meshed with the arc-shaped gear rod.

[0015] Preferably, a blocking plate is fixedly mounted on the other end of the arc-shaped gear rod, a limiting rod is fixedly mounted on the bottom of the connecting plate, and the arc-shaped gear rod is overlapped on the upper surface of the limiting rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, horizontal feeding is achieved through gear rack transmission, and the spiral groove mechanism is used to convert the rotational motion into a compound motion in the vertical plane. Combined with the angle and position control of the light emitter by the servo motor, high-precision, full-area scanning of large-scale optical glass surfaces is finally achieved. Its core advantage is that the mechanical structure design simplifies the two-dimensional motion control, improves the measurement efficiency and stability, and is suitable for large-scale flatness detection scenarios.

[0018] 2. In this invention, the scanning assembly adopts a "dual servo motor + curved gear" structure. The first servo motor precisely adjusts the horizontal scanning angle of the light emitter, and the second servo motor drives the light emitter to slide radially along an arc trajectory through gear meshing, achieving dynamic calibration of the irradiation position and focal length, ensuring that light is always projected onto the glass surface at the optimal angle. Combined with the vertical height adaptability of the spiral groove of the direction-changing assembly, the scanning assembly can automatically adapt to the height changes of the glass edge or curved surface, completing full-surface height difference measurement without the need for additional sensors. The design of the limit rod and blocking plate restricts the range of motion, avoids mechanical collisions, and further ensures the accuracy of angle and position adjustment.

[0019] 3. In the present invention, the horizontal movement of the carrier assembly is combined with the spiral motion of the deflection assembly, allowing the light emitter to form a "line-by-line spiral scanning" trajectory on the glass surface, covering large-scale surfaces without blind spots, avoiding the repetitive or blind spot problems of traditional raster scanning. The transmission ratio of the reduction motor and servo motor is precisely matched through the gear set, ensuring uniform scanning speed and consistent line spacing, improving the regularity and repeatability of data acquisition. After the measurement is completed, each component automatically resets to its initial state, reducing manual intervention and being suitable for assembly line batch testing. The overall structure is compact, the mechanical transmission components are highly integrated, and the anti-interference ability is strong. It can operate stably in industrial environments, significantly improving the efficiency and automation level of flatness inspection of large-scale optical glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a device for measuring the flatness of large-size optical glass according to the present invention;

[0021] Figure 2 This is a schematic diagram of the planar structure of a device for measuring the flatness of large-size optical glass according to the present invention;

[0022] Figure 3 This is a top view of a device for measuring the flatness of large-size optical glass according to the present invention;

[0023] Figure 4 This is a schematic diagram of the planar structure of a bearing assembly and a direction-changing assembly based on a large-size optical glass flatness measuring device of the present invention;

[0024] Figure 5 This is a schematic diagram of the lower surface structure of a supporting plate based on a large-size optical glass flatness measurement device of the present invention;

[0025] Figure 6 This is a schematic diagram of the connection and structure of the direction-changing component and the scanning component of a large-size optical glass flatness measurement device based on the present invention;

[0026] Figure 7This is a schematic diagram of the three-dimensional structure of a scanning component based on a large-size optical glass flatness measurement device of the present invention;

[0027] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure of part A.

[0028] In the figure: 1. Positioning platform; 2. Carrying assembly; 3. Direction-changing assembly; 4. Scanning assembly; 21. Positioning block; 22. First guide rod; 23. Carrying plate; 24. Rack; 31. Arched bracket; 32. Reducer motor; 33. Limit block; 34. Transmission rod; 35. Double-headed gear shaft; 36. Cylinder; 37. Bevel gear; 38. Limit cylinder; 39. Spiral groove; 310. Second guide rod; 41. Support rod; 42. First servo motor; 43. Connecting plate; 44. Connecting block; 45. Arc gear rod; 46. Trifold plate; 47. Connecting rod; 48. Light emitter; 49. Blocking plate; 410. Limit rod; 411. Second servo motor; 412. Connecting gear. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] Example 1: Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 Shown: A device for measuring the flatness of large-size optical glass. 1. Overall structure and transmission relationship

[0031] Carrying assembly 2: used to fix and move the optical glass to be measured, and is set as the X-axis linear motion along the horizontal direction of the positioning stage 1;

[0032] Direction-changing component 3: The Y-axis direction is perpendicular to the carrier component 2, driving the scanning component 4 to move in a spiral trajectory in the vertical plane, while realizing the linkage of the X / Y axes;

[0033] Scanning component 4: equipped with a light emitter 48, which adjusts the light angle and position through mechanical transmission to scan the glass surface;

[0034] Power transmission path: The power source is the reduction motor 32, which synchronously drives the linear motion of the carrying component 2 and the rotational motion of the direction-changing component 3 through the transmission rod 34, and finally converts it into the composite motion of the scanning component 4;

[0035] 2. Horizontal movement of bearing assembly 2 in the X-axis direction

[0036] Structure: The positioning block 21 fixes the first guide rod 22, and the carrying plate 23 is engaged with the gear at the end of the transmission rod 34 through the rack 24.

[0037] Movement principle: The reduction motor 32 drives the transmission rod 34 to rotate, the gear engages with the rack 24, and drives the carrying plate 23 to slide horizontally along the first guide rod 22, thereby achieving linear feeding of the measured glass in the X-axis direction.

[0038] 3. The spiral trajectory of the direction-changing component 3 drives the Y axis to be linked with the vertical direction

[0039] The transmission rod 34 is engaged with the gears of the double-headed gear shaft 35: the gear in the middle of the transmission rod 34 drives the carrier plate 23 to move, and the end gear is engaged with the double-headed gear shaft 35 to transmit the rotational motion to the cylinder 36. The bevel gear 37 at one end of the cylinder 36 is engaged with the double-headed gear shaft 35 to ensure that the cylinder 36 rotates synchronously with the transmission rod 34.

[0040] The guiding function of the spiral groove 39: The spiral groove 39 on the surface of the cylinder 36 is slidably connected to the connecting rod 47 of the scanning component 4. When the cylinder 36 rotates, the spiral groove 39 forces the connecting rod 47 to move along the spiral path of the groove, driving the scanning component 4 to perform a spiral ascent / descent motion in the vertical plane, achieving both Y-axis horizontal movement and vertical height change. In conjunction with the sliding limit of the connecting block 44 by the second guide rod 310, the scanning component 4 is ensured to move stably along the Y-axis direction.

[0041] 4. Angle Adjustment and Optical Measurement of Scanning Component 4

[0042] Position adjustment of the light emitter 48: The first servo motor 42 drives the connecting plate 43 to rotate, driving the arc-shaped gear rod 45 and the light emitter 48 to rotate around the central axis of the support rod 41 to adjust the scanning angle. The second servo motor 411 engages with the arc-shaped gear rod 45 through the connecting gear, driving the light emitter 48 to slide along the arc trajectory to accurately control the irradiation position. The limit rod 410 and the blocking plate 49 limit the movement range of the arc-shaped gear rod 45 to ensure movement accuracy.

[0043] Measurement principle: The light emitter 48 emits laser light to the glass surface. By receiving the reflected light or the deformation of the projected light spot, combined with triangulation or interference principle, the height difference of each point on the glass surface is calculated, and finally the flatness data is fitted. The spiral trajectory of the scanning component 4 is combined with the horizontal movement of the supporting component 2 to achieve full-area coverage scanning of the glass surface.

[0044] V. Motion Coordination and Trajectory Synthesis

[0045] Composite motion trajectory: The X-axis linear motion of the carrier component 2 + the Y-axis spiral motion of the direction-changing component 3 enable the light emitter 48 to form a spiral or grid-like scanning trajectory on the glass surface, ensuring measurement without blind spots;

[0046] Transmission ratio and precision control: The speed and torque of the reduction motor 32 and the servo motor are precisely matched through the transmission ratio of the gear, rack 24 and spiral groove 39 to ensure uniform scanning speed and qualified position accuracy.

[0047] Example 2: According to Figure 1 、 Figure 2 、 Figure 4 、 Figure 6 、 Figure 7 and Figure 8 As shown, the scanning assembly 4 includes a support rod 41, a connecting block 44 is fixedly installed at the bottom of the support rod 41, and a three-fold plate 46 is rotatably connected to the bottom of the connecting block 44, and a connecting rod 47 is fixedly installed on the lower surface of both ends of the three-fold plate 46, and a first servo motor 42 is fixedly installed on the top of the support rod 41, and the output end of the first servo motor 42 is fixedly connected to the connecting plate 43, and an arc-shaped gear rod 45 is slidably connected to one side of the connecting plate 43, and a light emitter 48 is fixedly installed on one end of the arc-shaped gear rod 45, and a second servo motor 411 is fixedly installed on the other side of the connecting plate 43, and the output end of the second servo motor 411 is fixedly connected to a connecting gear, which is meshed with the arc-shaped gear rod 45, and a blocking plate 49 is fixedly installed on the other end of the arc-shaped gear rod 45, and a limiting rod 410 is fixedly installed on the bottom of the connecting plate 43, and the arc-shaped gear rod 45 overlaps the upper surface of the limiting rod 410.

[0048] In this embodiment, the support rod 41 is slidably connected to the second guide rod 310 of the changing component 3 through the bottom connecting block 44, ensuring that the scanning component 4 can move along the Y-axis direction. The three-fold plate 46 is installed at the bottom of the connecting block 44 through a rotating connection, and the connecting rods 47 at both ends are embedded in the spiral groove 39 of the cylinder 36 of the changing component 3 to form a spiral motion guide.

[0049] Initial position calibration: Start the first servo motor 42 and the second servo motor 411 to drive the connecting plate 43 and the arc-shaped gear rod 45 to reset. The first servo motor 42 drives the connecting plate 43 to rotate, so that the light emitter 48 is aligned with the starting measurement point of the glass edge. The second servo motor 411 drives the arc-shaped gear rod 45 to slide on the limit rod 410 through the connecting gear, adjusting the radial position of the light emitter 48 to the initial scanning distance;

[0050] 2. Angle adjustment:

[0051] Horizontal angle rotation: The output shaft of the first servo motor 42 drives the connecting plate 43 to rotate clockwise / counterclockwise around the central axis of the support rod 41, synchronously driving the arc-shaped gear rod 45 and the light emitter 48 to rotate around the axis of the support rod 41, adjusting the horizontal angle of the light projection and scanning the angle along the width of the glass. The tri-fold plate 46 slides on the second guide rod 310 with the connecting block 44, maintaining coordination with the movement of the direction-changing assembly 3;

[0052] Angle precision control: The limit rod 410 supports the arc-shaped gear rod 45 to prevent shaking during rotation, and the blocking plate 49 limits the sliding limit position of the arc-shaped gear rod 45 to avoid over-limit angle adjustment;

[0053] 3. Position Fine Adjustment: The second servo motor 411 engages with the arc-shaped gear rod 45 via a connecting gear, driving the light emitter 48 to slide along the arc trajectory of the arc-shaped gear rod 45. When the connecting gear rotates clockwise or counterclockwise, the arc-shaped gear rod 45 moves radially toward or away from the center of the support rod 41 on the limiting rod 410, achieving precise adjustment of the distance between the light emitter 48 and the glass surface and vertical focal length calibration. In conjunction with the vertical height change of the spiral groove 39, this ensures that the light emitter 48 can be accurately focused at different heights.

[0054] Limitation and stability: The limit rod 410 serves as a support track for the arc-shaped gear rod 45, restricting it to slide only along a preset arc path. The blocking plate 49 prevents the arc-shaped gear rod 45 from sliding excessively and protects the light emitter 48 from colliding with other components.

[0055] 4. Spiral motion coordination: linkage with direction change component 3

[0056] The direction-changing assembly 3 drives the scanning trajectory: When the cylinder 36 of the direction-changing assembly 3 rotates due to the meshing of the gears between the transmission rod 34 and the double-headed gear shaft 35, the spiral groove 39 forces the connecting rod 47 to move along a spiral path. The tri-fold plate 46 drives the connecting block 44 to slide horizontally along the Y-axis on the second guide rod 310. Simultaneously, due to the lifting and lowering characteristics of the spiral groove 39, the scanning assembly 4 simultaneously changes its height in the vertical Z-axis, forming a combined spiral ascending / descending motion. The support rod 41 moves with the connecting block 44, ensuring that the angle and position adjustment of the light emitter 48 are synchronized with the spiral trajectory.

[0057] Motion coupling relationship: The X-axis horizontal movement of the gear rack 24 of the carrier assembly 2 is combined with the Y-axis spiral motion of the scanning assembly 4, so that the light emitter 48 forms a "line-by-line spiral scanning" trajectory on the glass surface, covering the entire area without blind spots;

[0058] 5. Optical Scanning and Data Collection

[0059] Light projection and feedback: The light projector 48 transmits measurement light, such as laser or infrared light, to the glass surface. After the light is reflected by the glass, the position of the reflected light or interference fringes is captured by the receiving device. Based on the principle of triangulation, the height value of each point on the glass surface is calculated by the emission angle, reception angle and optical path difference, or the flatness error is analyzed by the deformation of the interference fringes.

[0060] Dynamic adjustment and scanning: During the scanning process, if fluctuations in the glass surface are detected, the control system drives the first / second servo motor 411 in real time to fine-tune the angle and position of the light emitter 48 to ensure that the light is always projected vertically or at a preset angle to the measurement point. The continuous sliding of the connecting rod 47 in the spiral groove 39 enables the light emitter 48 to automatically adapt to the height changes of the glass edge or curved surface in the vertical plane;

[0061] 6. Cycle Scan and Reset

[0062] Area coverage scanning: When the carrier plate 23 moves to the end along the X-axis, the reduction motor 32 reverses, the carrier plate 23 moves in the opposite direction, and the cylinder 36 continues to rotate. The scanning component 4 returns to the starting position of the next row through the spiral groove 39, and the angle adjustment and scanning actions are repeated until the entire glass surface is measured;

[0063] Reset after measurement: The second servo motor 411 drives the arc-shaped gear rod 45 to reset to the initial radial position, and the light emitter 48 returns to a safe distance. The first servo motor 42 drives the connecting plate 43 to rotate, so that the axis of the light emitter 48 is aligned with the axis of the support rod 41 to prevent the components from being stressed during long-term static operation. The connecting block 44 slides along the second guide rod 310 to the initial end of the direction-changing assembly 3, waiting for the next measurement task;

[0064] Summary of the core operating logic: Angle adjustment by the first servo motor 42 → radial fine-tuning by the second servo motor 411 → spiral trajectory linkage change-of-direction component 3 → optical scanning emitter 48 operates → cyclically covers the entire surface → reset and standby. Through the design of "dual servo motors controlling angle and position + spiral groove 39 guiding compound motion", the scanning component 4 achieves high-precision, full-area scanning of large-size optical glass surfaces, ensuring the efficiency and accuracy of flatness measurement.

[0065] Example 3: According to Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 6As shown, the bearing assembly 2 includes a positioning block 21, which is fixedly mounted at both ends of the upper surface of the positioning platform 1, and a first guide rod 22 is fixedly mounted between the two positioning blocks 21. A bearing plate 23 is sleeved on the outer wall of the first guide rod 22, and a rack 24 is fixedly mounted on the lower surface of the bearing plate 23. The direction-changing assembly 3 includes an arch bracket 31 and a reduction motor 32. The reduction motor 32 is located at one end of the arch bracket 31, and the output shaft of the reduction motor 32 is fixedly connected to a transmission rod 34. A limiting cylinder 38 is fixedly mounted on the upper surface of the positioning platform 1, and the transmission rod 34 is rotatably mounted inside the limiting cylinder 38. Gears are fixedly mounted on the outer wall and end of the rod body of the transmission rod 34, and the transmission rod 34 is located at the arch At the bottom of the bracket 31, the transmission rod 34 is meshed with the rack 24 on the lower surface of the supporting plate 23 through a set gear. The other end of the arch bracket 31 is fixedly installed with a limit block 33. The inside of the limit block 33 is rotatably installed with a double-headed gear shaft 35. One end of the double-headed gear shaft 35 is meshed with the gear at the end of the transmission rod 34. The cylinder 36 is rotatably installed on the top of the arch bracket 31. One end of the cylinder 36 is fixedly installed with a bevel gear 37. One end of the bevel gear 37 is meshed with the double-headed gear shaft 35. A second guide rod 310 is fixedly installed on the top of the arch bracket 31. The second guide rod 310 is slidably connected to the connecting block 44. The second guide rod 310 is located above the cylinder 36.

[0066] In this embodiment, 1. Carrying assembly 2: Horizontal movement X-axis direction feed

[0067] Structural positioning and initial installation: The positioning blocks 21 are fixed to both ends of the positioning platform 1, supporting the first guide rod 22 to form a horizontal guide rail. The bearing plate 23 is sleeved on the first guide rod 22 and can slide along the X-axis direction.

[0068] The optical glass to be measured is placed on the carrier plate 23 and fixed by a positioning structure fixture to ensure stability and no displacement during measurement;

[0069] Power input and gear rack 24 transmission: After the reduction motor 32 is started, the output shaft drives the transmission rod 34 to rotate in the limiting cylinder 38. The limiting cylinder 38 provides axial support to prevent the transmission rod 34 from deflecting;

[0070] The gear on the outer wall of the transmission rod 34 engages with the rack 24 on the lower surface of the carrier plate 23, converting the rotational motion of the motor into linear motion of the carrier plate 23. When the transmission rod 34 rotates clockwise, the gear drives the rack 24 to move to the right, and the carrier plate 23 slides to the right along the first guide rod 22. When it rotates counterclockwise, the carrier plate 23 resets to the left, realizing reciprocating feeding in the X-axis direction.

[0071] Functional realization: The horizontal movement of the carrier plate 23 drives the glass to be tested to pass through the scanning area row by row, and cooperates with the vertical movement of the scanning component 4 to achieve full-width coverage scanning of the glass surface. The gear rack 24 transmission has high precision and high torque characteristics, which is suitable for the stable movement of large-sized glass;

[0072] 2. Direction change component 3: spiral trajectory drives the Y axis and vertical direction linkage

[0073] Power branch and gear transmission chain: The gear at the end of the transmission rod 34 meshes with the gear at one end of the double-headed gear shaft 35, dividing the power of the reduction motor 32 into two paths. One path drives the carrier component 2 to move horizontally along the X axis, and the other path is transmitted to the bevel gear 37 through the double-headed gear shaft 35, driving the cylinder 36 at the top of the arch bracket 31 to rotate the bevel gear 37 to change the transmission direction, thereby realizing vertical power transmission;

[0074] The spiral groove 39 guides and links the scanning assembly 4: The spiral groove 39 on the surface of the cylinder 36 is slidably connected to the connecting rod 47 of the scanning assembly 4. When the cylinder 36 rotates, the spiral line of the spiral groove 39 forces the connecting rod 47 to move along the groove. The connecting rod 47 is connected to the connecting block 44 of the scanning assembly 4 via the tri-fold plate 46, driving the scanning assembly 4 to slide horizontally in the Y-axis direction on the second guide rod 310. At the same time, the lifting characteristics of the spiral groove 39 produce a vertical height change in the Z-axis, forming a spiral ascending / descending compound motion trajectory. The second guide rod 310 limits the movement direction of the connecting block 44, ensuring that the scanning assembly 4 moves stably only in the Y-axis direction, avoiding rotation or shaking.

[0075] The transmission ratio is synchronized with the movement: The speed of the reduction motor 32 is precisely matched to the rotation speed of the cylinder 36 through the gear train transmission rod 34 → double-headed gear shaft 35 → bevel gear 37, ensuring that the X-axis movement of the carrier assembly 2 is synchronized with the spiral movement of the scanning assembly 4, forming a uniform scanning spacing. For each rotation of the carrier plate 23, the carrier plate moves one scanning line width. The limit block 33 supports the double-headed gear shaft 35, ensuring the stability of the gear meshing and preventing axial movement during the transmission process.

[0076] 3. Two-component collaborative workflow

[0077] Power startup and initialization: Start the reduction motor 32, the transmission rod 34 begins to rotate, and simultaneously drives the X-axis of the carrier assembly 2 and the cylinder 36 of the direction-changing assembly 3 to rotate. The connecting rod 47 of the scanning assembly 4 initially rotates with the cylinder 36 and enters the starting point of the spiral groove 39. The connecting block 44 is located at the left or right edge of one end of the second guide rod 310, and the light emitter 48 is aligned with the starting measurement point of the glass edge;

[0078] Composite motion trajectory synthesis: In the X-axis direction, the carrier plate 23 moves horizontally along the first guide rod 22, driving the glass surface to pass through the scanning area line by line. In the Y-axis and vertical direction, when the cylinder 36 rotates, the spiral groove 39 drives the scanning assembly 4 to move horizontally along the Y-axis. At the same time, due to the height change caused by the helical rise angle, it gradually rises or falls when scanning from one end of the glass to the other, forming a spiral scanning trajectory.

[0079] The combination of the two enables the light emitter 48 to form a "row-by-row spiral coverage" on the glass surface, ensuring measurement without blind spots;

[0080] Limit and reset: When the carrier plate 23 moves to the right limit position of the X-axis end, the reduction motor 32 reverses, the carrier plate 23 moves in the opposite direction, and the cylinder 36 continues to rotate. The scanning component 4 returns to the starting position of the next row through the spiral groove 39 and moves in the opposite direction of the Y-axis, and the height is adjusted synchronously;

[0081] The limiting cylinder 38 and the limiting block 33 ensure the rotation accuracy of the transmission rod 34 and the double-headed gear shaft 35, and prevent mechanical collision caused by excessive rotation.

[0082] 4. Summary of Core Functions

[0083] The carrier assembly 2 achieves horizontal feeding of the glass through the gear rack 24, covering a large size range in the X-axis direction. The direction-changing assembly 3 converts the single rotational power into a compound motion of the Y-axis horizontal movement and vertical height change of the scanning assembly 4 through the gear set and spiral groove 39 mechanism. The two work together to enable the emitter 48 to scan the glass surface along a spiral trajectory. Combined with the angle and position adjustment servo motor control of the scanning assembly 4, efficient and high-precision flatness measurement of large-scale optical glass is ultimately achieved.

[0084] The device is used in accordance with its operating principle. A reduction motor 32 is used as the core power source. Its output shaft drives the transmission rod 34 to rotate within the limiting cylinder 38, dividing the power into two paths: one path is through the outer wall gear of the transmission rod 34, which engages with the rack 24 of the carrier assembly 2, driving the carrier plate 23 to slide horizontally along the first guide rod 22, thereby achieving linear feed of the glass being measured in the X-axis direction; the other path is through the end gear of the transmission rod 34, the double-headed gear shaft 35, and the bevel gear 37, which drives the cylinder 36 to rotate on the top of the arch bracket 31. The cylinder 36 is slidably connected to the connecting rod 47 of the scanning assembly 4 through the spiral groove 39 on the surface of the cylinder 36, forcing the scanning assembly 4 to slide horizontally along the second guide rod 310 in the Y-axis direction. Due to the lifting characteristics of the spiral groove 39, a vertical height change in the Z-axis is generated, forming a "spiral rise / fall" compound motion trajectory. In the scanning assembly 4, a first servo motor 42 drives the connecting plate 43 to rotate about the support rod 41, driving the curved gear rod 45 and the light projector 48 to adjust the horizontal scanning angle. A second servo motor 411, meshing with the curved gear rod 45 via a connecting gear, drives the light projector 48 to slide radially along an arc trajectory to precisely control its distance from the glass surface. A limit rod 410 and a blocking plate 49 ensure motion accuracy and safety. The light projector 48 projects light onto the glass surface. By receiving reflected light or interference fringes, it calculates the height difference at each point and fits the flatness data using triangulation or interferometry. The X-axis linear motion of the carrier assembly 2 combined with the Y-axis spiral motion of the direction-changing assembly 3 enables the light projector 48 to form a "line-by-line spiral scanning" trajectory, covering the glass surface without blind spots. When the carrier plate 23 reaches the end of the X-axis, the reduction motor 32 reverses and resets, and the scanning assembly 4 switches to the starting position of the next row via the spiral groove 39 to repeat the scan. Mechanical structures such as the gear rack 24 and spiral groove 39, combined with high-precision control by a servo motor, ensure uniform scanning speed and controllable positional errors. Upon completion of measurement, all components return to their initial state. This device utilizes a coordinated mechanism: a reduction motor 32 drives a composite transmission chain, gear rack 24 provides horizontal feed, spiral groove 39 generates composite vertical motion, dual servo motors fine-tune the angle and position of the reflector 48, and optical flatness measurement is employed. This device transforms large-scale glass flatness measurement into a combination of mechanical trajectory motion and optical signal processing. This delivers both high efficiency and precision, making it suitable for industrial-grade quality inspection of large-scale optical components.

[0085] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for measuring the flatness of large-size optical glass, comprising a positioning table (1), characterized in that: A bearing assembly (2) and a direction-changing assembly (3) are fixedly mounted on the upper surface of the positioning platform (1); the direction-changing assembly (3) is perpendicular to the bearing assembly (2); and a scanning assembly (4) is movably connected to the top of the direction-changing assembly (3); The scanning assembly (4) includes a support rod (41), a connecting block (44) is fixedly installed at the bottom of the support rod (41), a three-fold plate (46) is rotatably connected to the bottom of the connecting block (44), connecting rods (47) are fixedly installed on the lower surfaces of both ends of the three-fold plate (46), a first servo motor (42) is fixedly installed on the top of the support rod (41), an output end of the first servo motor (42) is fixedly connected to the connecting plate (43), a side of the connecting plate (43) is slidably connected to an arc-shaped gear rod (45), and a light emitter (48) is fixedly installed on one end of the arc-shaped gear rod (45); The direction-changing assembly (3) includes a cylinder (36), an arched bracket (31) and a reduction motor (32). The surface of the cylinder (36) is provided with staggered and interconnected spiral grooves (39), and the connecting rod (47) is slidably connected to the inner side of the spiral groove (39). The reduction motor (32) is located at one end of the arch bracket (31), and the output shaft of the reduction motor (32) is fixedly connected to the transmission rod (34). The upper surface of the positioning platform (1) is fixedly installed with a limit cylinder (38), and the transmission rod (34) is rotatably installed inside the limit cylinder (38). The other end of the arch bracket (31) is fixedly installed with a limit block (33), and the inside of the limit block (33) is rotatably installed with a double-headed gear shaft (35), and one end of the double-headed gear shaft (35) is engaged with the gear at the end of the transmission rod (34). The cylinder (36) is rotatably mounted on the top of the arch bracket (31). A bevel gear (37) is fixedly mounted on one end of the cylinder (36). One end of the bevel gear (37) is meshed with the double-headed gear shaft (35). The transmission rod (34) is meshed with the gear of the double-headed gear shaft (35) to transmit the rotational motion to the cylinder (36). When the cylinder (36) rotates, the spiral groove (39) forces the connecting rod (47) to move along the spiral path of the groove, driving the scanning component (4) to perform a composite motion of spiral rise / descent in the vertical plane with both Y-axis horizontal movement and vertical height change, thereby realizing the linkage of the X / Y axes.

2. The large-scale optical glass flatness measuring device according to claim 1, characterized in that: The bearing assembly (2) includes positioning blocks (21), the positioning blocks (21) are fixedly mounted on both ends of the upper surface of the positioning platform (1), a first guide rod (22) is fixedly mounted between the two positioning blocks (21), a bearing plate (23) is sleeved on the outer wall of the first guide rod (22), and a rack (24) is fixedly mounted on the lower surface of the bearing plate (23).

3. The device for measuring the flatness of large-size optical glass according to claim 1, characterized in that: Gears are fixedly mounted on the outer wall and end of the rod body of the transmission rod (34). The transmission rod (34) is located at the bottom of the arch bracket (31). The transmission rod (34) is meshed with the rack (24) on the lower surface of the bearing plate (23) through the provided gear.

4. The device for measuring the flatness of large-size optical glass according to claim 1, characterized in that: A second guide rod (310) is fixedly mounted on the top of the arch support (31), the second guide rod (310) is slidably connected to the connecting block (44), and the second guide rod (310) is located above the cylinder (36).

5. The device for measuring the flatness of large-size optical glass according to claim 1, characterized in that: A second servo motor (411) is fixedly mounted on the other side of the connecting plate (43), and an output end of the second servo motor (411) is fixedly connected to a connecting gear (412), which is meshedly connected to the arc-shaped gear rod (45).

6. The large-scale optical glass flatness measuring device according to claim 1, characterized in that: A blocking plate (49) is fixedly mounted on the other end of the arc-shaped gear rod (45), a limiting rod (410) is fixedly mounted on the bottom of the connecting plate (43), and the arc-shaped gear rod (45) is overlapped on the upper surface of the limiting rod (410).

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