A 3D curved glass laser profile detector and detection method thereof

Abstract

The present invention provides a 3D curved glass laser contour detector and a detection method thereof, wherein a y-axis driving device is provided at the upper end of the base, the z-axis driving device is connected to a rotation measuring device, and the x-axis driving device is connected to a stage; the rotation measuring device comprises a circular ring fixing plate, a rotating ring, a laser measuring module, an image detection module, a light source module, and a driving module; the middle portion of the rotating ring is a large circular hole, and the laser working point of the laser measuring module is located at the center of the large circular hole. Compared with the traditional detection device that rotates with the motor shaft as the center, the contour detector and the detection method of the present invention have a laser measuring module fixed at the top inner side of the rotating plate, and the outer side of the rotating plate has a driven tooth. During detection, the measuring head is used as the center of the circle to rotate, so that the measuring line emitted by the laser measuring module is always consistent with the normal line of the arc surface measurement position, which can improve the detection accuracy of the curved glass contour.

Description

Technical Field

[0001] The present invention relates to the technical field of CCD advanced measuring equipment, and in particular to a 3D curved glass laser profile detector and a detection method thereof. Background Art

[0002] 3D curved glass is the current development trend of smart phones, and the market demand is increasing. Surface contour is an important precision indicator of curved glass, which needs to be focused on during the production process. In the existing technology, the main detection devices for curved glass detection are laser (non-contact) and probe (contact) detectors driven by three-coordinates. However, due to the low efficiency of probe (contact) detectors, they cannot meet the needs of industrialization. Therefore, laser (non-contact) has become the mainstream detector in the current industry. Its measurement principle is as follows: Figure 1-2 As shown, the laser can only translate in three directions. When the position of the curved surface of the curved glass 10 is detected, the reflection and refraction characteristics of the transparent glass material surface determine that the laser detection head can only receive signals within the maximum positive and negative angle range of 20° of the normal to the glass curved surface. Therefore, the three-axis translation laser (non-contact) method based on three-coordinate drive cannot receive the return signal of the curved surface of the curved glass that is too large (the angle between the normal to the curved surface and the horizontal angle exceeds 20°). As a result, most of the curved glass with an angle between the normal to the curved surface exceeding 20° and the horizontal angle cannot be accurately measured in this way, and can only be judged by relying on the theoretical size of the production mold, which seriously hinders the improvement of production quality.

[0003] In order to improve the above defects, some manufacturers have launched a device for rapid measurement of 3D curved glass, such as the application number 201720501332.7, which adds a rotary table and sets a non-contact displacement sensor on the rotary table to enable rotation measurement. However, since the non-contact displacement sensor of the device is directly installed on the rotary table, its measurement principle is as follows: Figure 3 As shown, the rotary table rotates around the axis of rotation, and the rotation arc length of the sensing end of the non-contact displacement sensor is set to d, the rotation angle is n, and the distance between the axis of rotation of the rotary table and the sensing end of the non-contact displacement sensor (equivalent to the radius) is r, d = nπr / 180. That is to say, when the rotary table rotates a very small angle, the rotation arc length of the sensing end of the non-contact displacement sensor can reach a considerable value. The surface profile of the curved glass 10 to be measured requires a high accuracy. Therefore, for ordinary servo motors, it is very easy to cause secondary amplification of the measurement error. Summary of the invention

[0004] In view of the above problems, the present invention provides a 3D curved glass laser profile detector and a detection method thereof, which has small error, high detection accuracy and high detection efficiency.

[0005] To achieve the above object, the present invention solves the problem through the following technical solutions:

[0006] A 3D curved glass laser profile detector, comprising a chassis, the chassis comprising a base and an upper shell, the upper end of the base is provided with a Y-axis drive device and a support seat, the output end of the Y-axis drive device is connected to a mounting frame, the top of the mounting frame is fixed with a Z-axis drive device, the output end of the Z-axis drive device is connected to a rotation measuring device, the support seat is provided with an X-axis drive device, the output end of the X-axis drive device is connected to a stage;

[0007] The rotation measuring device comprises a circular ring fixing plate connected to the output end of the Z-axis driving device, a rotating ring located inside the circular ring fixing plate, a laser measuring module fixed to the top inner side of the rotating ring, an image detection module connected to one end of the laser measuring module, a light source module located directly below the image detection module, and a driving module for driving the rotating ring to rotate, wherein the driving module is fixed to the bottom of the circular ring fixing plate, and the light source module is fixed to the upper end of the driving module;

[0008] The middle part of the rotating ring is a large circular hole, and the laser working point of the laser measurement module is located at the center of the large circular hole;

[0009] The stage is located between the laser measurement module and the light source module.

[0010] Specifically, the Y-axis driving device includes a Y-axis servo motor fixed on the upper end of the base, a Y-axis lead screw connected to the output shaft of the Y-axis servo motor, and a Y-axis slider slidably connected to the Y-axis lead screw, and the Y-axis slider is the output end of the Y-axis driving device.

[0011] Specifically, the Z-axis driving device includes a Z-axis servo motor fixed on the top of the mounting frame, a Z-axis screw connected to the output shaft of the Z-axis servo motor, and a Z-axis slider slidably connected to the Z-axis screw, and the Z-axis slider is the output end of the Z-axis driving device.

[0012] Specifically, the X-axis driving device includes an X-axis servo motor fixed on the support seat, an X-axis lead screw connected to the output shaft of the X-axis servo motor, and an X-axis slider slidably connected to the X-axis lead screw, and the X-axis slider is the output end of the X-axis driving device.

[0013] Specifically, the driving module includes a driving motor fixedly connected to the circular ring fixing plate, and a driving gear connected to the output shaft of the driving motor, and the outer side surface of the rotating ring is provided with a driven tooth meshing with the driving gear.

[0014] Specifically, the image detection module includes a CCD camera and a first reflector located at the front end of the CCD camera, and the first reflector reflects downward at 45 degrees.

[0015] Specifically, the light source module includes a light source and a second reflector located at the front end of the light source, and the second reflector reflects upward at an angle of 45°.

[0016] Specifically, a light-transmitting glass plate is provided on the loading platform.

[0017] Specifically, a power module and a control module are arranged in the base, a display panel is fixed on the front end surface of the upper shell, a dust cover is sleeved on the outer side of the support base, and a keyboard placement plate is rotatably connected to the front end of the dust cover.

[0018] A detection method of a 3D curved glass laser profile detector comprises the following steps:

[0019] S1 detector mechanism firmware calibration back to zero: set the laser working point to the center of the rotating ring and perpendicular to the stage, that is, perpendicular to the X-axis, set X=0, Z=0, θ=0, Y=0, where Y can correspond to any specified position of the Y-axis mechanical coordinate of the detector; at this time, there is a fixed offset Bx, By between the center of the image detection module and the center of the laser measurement module, and the center of the image detection module can be set to O2 (X-Bx, Y-By); specify a cross section at any position along the Y direction of the curved glass, and use the image detection module above to scan the physical boundary 1 and the physical boundary 2 to construct the symmetry center O2 (X-Bx, Y-By). At this time, the conversion relationship between O2 (X-Bx, Y-By) and O (X, Y) is: the detector is translated along the X-axis by one +Bx unit, that is, X-Bx+Bx=X, and the detector is translated along the Y-axis by one +By unit, that is, Y-By+By=Y;

[0020] S2 pre-imports the theoretical contour curve and contour tolerance of the curved glass through the system software, and automatically converts the imported theoretical curve into the theoretical trajectory coordinates of the laser working point (X, Z, θ) through the software algorithm, where X represents the X-axis coordinate, Z represents the Z-axis coordinate, and θ represents the angle between the real-time normal of the theoretical contour curve and the X-axis; the center point of the theoretical curve is set to O (X, Z, θ, Y), at which point X = 0, Z = 0, θ = 0, and Y corresponds to any specified position of the Y-axis mechanical coordinate of the instrument, so any cross-section position can be specified according to the detection requirements, and Y = 0 is set;

[0021] The S3 system matches and calculates that the actual contour coordinate origin O1 (X1, Z1, θ1) of any specified cross section of the curved glass is completely coincident with the theoretical trajectory coordinate origin O (X, Z, θ) of the laser working point; the curved glass is placed on the stage, and the image detection module above scans the physical boundary 1 and the physical boundary 2 to construct the symmetry center O2 (X-Bx, Y-By), and converts it into the laser coordinate center O (X, Y); by adjusting the Z-axis drive device of the instrument, the origin coordinate Z=Z1=0 of the laser working point of the laser measurement module; the X-axis drive device is adjusted so that the output end stage drives the curved glass to move to the origin coordinate X=X1=0 of the center of the physical contour section, and then translates a length L along the X-axis relative to this origin coordinate, L≠0, at this time the laser will collect a height change value H relative to Z=Z1=0, and △θ can be calculated according to the trigonometric function formula;

[0022] The S4 system recalculates and establishes the coordinates of each point on the actual motion trajectory of the laser working point as: O1(X1, Z1, θ1), where X1=X+cos(△θ), Z1=Z+Z.sin(△θ), θ1=θ+△θ;

[0023] S5 starts measuring, the laser measuring module follows the preset travel and rotation angle along the three axes of X, Z and θ, and the laser working point follows the coordinates O1 (X1, Z1, θ1) of each point on the actual motion trajectory to perform a full closed-loop difference compensation motion to ensure that the three coordinates reach the specified coordinate position at the same time; specifically, the X-axis drive device realizes the X1 coordinate positioning of the laser working point, the Z-axis drive device realizes the Z1 coordinate positioning of the laser working point, and the drive module realizes the rotation positioning of the θ1 angle of the laser working point;

[0024] Fitting and calculation of S6 profile tolerance. The laser working point scans along the coordinates O1 (X1, Z1, θ1) of each point on the corrected actual motion trajectory, and collects and calculates P1...P n If the actual cross-sectional profile of the curved glass (10) is completely consistent with the theoretical profile, then P1...P n = 0, T1 = 0; if the actual cross-sectional profile of the curved glass (10) is not completely consistent with the theoretical profile, a software algorithm is used to implement a circular comparison, starting from the measured points P1...P n Filter out the maximum value P max and the minimum value P min The point P1...P corresponding to the normal line n Subtract and calculate the measured profile tolerance value T1 of the curve, then T1=│P max -P0│+│P min-P0│, then T1 is the actual profile tolerance value of the curved glass. The software automatically determines the OK or NG status by comparing it with the theoretical profile tolerance T: that is, when T1≤T, the product status is determined to be OK; when T1>T, the product status is determined to be NG, where T1 and T are both ≥0.

[0025] The beneficial effects of the present invention are:

[0026] First, the 3D curved glass laser profile detector and its detection method of the present invention use an image detection module to guide and locate the curved glass position; adopt three-axis linkage difference compensation motion, that is, use an X-axis drive device and a Z-axis drive device to realize X and Z coordinate positioning, use a rotation measurement device to realize the laser measurement module to perform contour trajectory scanning measurement along the normal direction of the curved glass, use a software algorithm to fit and depict the real contour curve of the measured object through multiple depiction measurement points and compare it with the standard theoretical line, and obtain the measurement result through computer software algorithm analysis, so as to systematically determine the detection result, without manual detection and comparison, with high detection efficiency and high detection accuracy;

[0027] Second, compared with the traditional detection device that rotates around the motor shaft, this design adds a rotating ring that rotates around the center. The laser measurement module is fixed on the top of the inner side of the rotating ring, and the laser working point of the laser measurement module is located at the center of the rotating ring. The outer side of the rotating ring is equipped with driven teeth. The laser measurement module is driven by the motor and gears to rotate with its measuring head as the center, so that the measurement line emitted by the laser measurement module is always consistent with the normal of the arc surface measurement position, which can improve the detection accuracy of the curved glass contour. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a measurement principle diagram of a laser measuring head in the prior art. The measurement range is not limited and can be selected according to actual conditions. The values ​​in the figure are for reference only.

[0029] Figure 2 This is a measurement principle diagram of the first laser measuring instrument in the prior art.

[0030] Figure 3 This is a measurement principle diagram of the second laser measuring instrument in the prior art.

[0031] Figure 4 It is a structural schematic diagram of a 3D curved glass laser profile detector of the present invention.

[0032] Figure 5 This is a front view of a 3D curved glass laser profile detector of the present invention.

[0033] Figure 6 for Figure 5 Cross-section view of the AA surface in the middle.

[0034] Figure 7 The internal structure of a 3D curved glass laser profile detector of the present invention Figure 1 .

[0035] Figure 8 The internal structure of a 3D curved glass laser profile detector of the present invention Figure 2 .

[0036] Fig. 9 The structure of the rotation measuring device in the present invention is shown in FIG. Figure 1 .

[0037] Fig.10 The structure of the rotation measuring device in the present invention is shown in FIG. Figure 2 .

[0038] Fig.11 It is a schematic diagram of the structure of the laser measurement module, image detection module, light source module and stage in the present invention.

[0039] Fig.12 It is a schematic diagram of the measurement principle of the present invention.

[0040] Fig.13 It is a schematic diagram of step S2 in a detection method of a 3D curved glass laser profile detector of the present invention.

[0041] Fig.14 It is a schematic diagram of step S3 in the detection method of a 3D curved glass laser profile detector of the present invention.

[0042] Fig.15 It is a schematic diagram of step S6 in the detection method of a 3D curved glass laser profile detector of the present invention.

[0043] The accompanying drawings are marked as: base 1, power module 11, control module 12, dust cover 13, keyboard placement plate 14, upper shell 2, display panel 21, Y-axis driving device 3, Y-axis servo motor 31, Y-axis screw rod 32, Y-axis slider 33, support seat 4, mounting frame 5, Z-axis driving device 6, Z-axis servo motor 61, Z-axis screw rod 62, Z-axis slider 63, rotation measuring device 7, circular ring fixing plate 71, rotating ring 72, driven gear 721, laser measurement module 73, image detection module 74, CCD camera 741, first reflector 742, light source module 75, light source 751, second reflector 752, driving module 76, driving motor 761, driving gear 762, X-axis driving device 8, X-axis servo motor 81, X-axis screw rod 82, X-axis slider 83, stage 9, curved glass 10. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with examples and drawings, but the embodiments of the present invention are not limited thereto.

[0045] Reference Figure 4-12 As shown:

[0046] A 3D curved glass laser profile detector, comprising a chassis, the chassis comprising a base 1 and an upper shell 2, a Y-axis driving device 3 and a support seat 4 are arranged on the upper end of the base 1, an output end of the Y-axis driving device 3 is connected to a mounting frame 5, a Z-axis driving device 6 is fixed to the top of the mounting frame 5, an output end of the Z-axis driving device 6 is connected to a rotation measuring device 7, an X-axis driving device 8 is arranged on the support seat 4, and an output end of the X-axis driving device 8 is connected to a stage 9;

[0047] The rotation measuring device 7 includes a circular ring fixing plate 71 connected to the output end of the Z-axis driving device 6, a rotating ring 72 located inside the circular ring fixing plate 71, a laser measuring module 73 fixed to the top of the inner side of the rotating ring 72, an image detection module 74 connected to one end of the laser measuring module 73, a light source module 75 located directly below the image detection module 74, and a driving module 76 for driving the rotating ring 72 to rotate, wherein the driving module 76 is fixed to the bottom of the circular ring frame 71, and the light source module 75 is fixed to the upper end of the driving module 76;

[0048] The middle of the rotating ring 72 is a large circular hole, and the measuring head of the laser measuring module 73 is located at the center of the circular hole. The rotating ring 72 indirectly drives the laser measuring module 73 to rotate. When rotating, it rotates with the working point of the measuring head of the laser measuring module 73 as the center. The radius of the rotating ring 72 is set to R, the rotation angle of the laser measuring module 73 is set to N, and the rotation arc of the rotating ring 72 is set to L, N = 180L / πR, so the rotation angle N of the laser measuring module 73 can be reduced by increasing the radius R of the rotating ring 72, thereby improving the accuracy of the rotation angle N, that is, improving the accuracy of the measurement. Compared with improving the accuracy of the motor, such a method is easier to operate and has a lower cost;

[0049] The stage 9 is located between the laser measurement module 73 and the light source module 75 .

[0050] Preferably, the Y-axis driving device 3 is used to drive the mounting frame 5 to move in the Y-axis direction. The Y-axis driving device 3 includes a Y-axis servo motor 31 fixed to the upper end of the base 1, a Y-axis screw rod 32 connected to the output shaft of the Y-axis servo motor 31, and a Y-axis slider 33 slidably connected to the Y-axis screw rod 32. The Y-axis slider 33 is the output end of the Y-axis driving device 3.

[0051] Preferably, the Z-axis driving device 6 is used to rotate the measuring device 7 to move in the Z-axis direction. The Z-axis driving device 6 includes a Z-axis servo motor 61 fixed to the top of the mounting frame 5, a Z-axis screw rod 62 connected to the output shaft of the Z-axis servo motor 61, and a Z-axis slider 63 slidably connected to the Z-axis screw rod 62. The Z-axis slider 63 is the output end of the Z-axis driving device 6.

[0052] Preferably, the X-axis drive device 8 is used to drive the movement of the worktable 9 in the X-axis direction. The X-axis drive device 8 includes an X-axis servo motor 81 fixed on the support base 4, an X-axis screw rod 82 connected to the output shaft of the X-axis servo motor 81, and an X-axis slider 83 slidably connected to the X-axis screw rod 82. The X-axis slider 83 is the output end of the X-axis drive device 8.

[0053] Preferably, the driving module 76 includes a driving motor 761 fixedly connected to the circular ring frame 71, and a driving gear 762 connected to the output shaft of the driving motor 761. The outer side of the rotating ring 72 is provided with a driven tooth 721 meshing with the driving gear 762. The driving motor 761 and the driving gear 762 are used to drive the rotating ring 72 to rotate. The radius of the rotating ring 72 is large, and it is easier to control the rotation angle of the laser measurement module 73 by controlling the rotation amount of the driving gear 762, which can reduce measurement errors and achieve high final measurement accuracy.

[0054] Preferably, the image detection module 74 includes a CCD camera 741 and a first reflector 742 located at the front end of the CCD camera 741 , and the first reflector 742 reflects downward at a 45° angle.

[0055] Preferably, the light source module 75 includes a light source 751 and a second reflector 752 located at the front end of the light source 751 , and the second reflector 752 reflects upward at an angle of 45°.

[0056] Preferably, a light-transmitting glass plate is provided on the stage 9, and the light-transmitting glass plate can transmit light, so that the light source module 75 below can provide brightness for the curved glass 10 on the upper side. Of course, the light-transmitting glass plate can also be eliminated and a light-transmitting hole can be opened on the stage 9. However, in order to adapt to the inspection of curved glass 10 of various sizes and to ensure the flatness of the placement surface, a light-transmitting glass plate is necessary.

[0057] Preferably, a power module 11 and a control module 12 are provided in the base 1 , and a display panel 21 is fixed to the front end surface of the upper shell 2 .

[0058] Preferably, a dust cover 13 is also provided on the outside of the support base 4, and a keyboard placement plate 14 is rotatably connected to the front end of the dust cover 13. The keyboard placement plate 14 is used to place the keyboard. The keyboard is connected to the control module 12 and cooperates with the display panel 21 to make the operation more convenient.

[0059] A detection method of a 3D curved glass laser profile detector comprises the following steps:

[0060] S1 Detector mechanism firmware calibration back to zero (i.e., X, Z, θ, Y coordinates reset to zero): Set the laser working point to the center of the rotating ring 72 (firmware assembly setting), and when it is perpendicular to the stage 9 (X axis), set X=0, Z=0, θ=0, Y=0 (Y can correspond to any specified position of the Y axis mechanical coordinate of the detector); at this time, the center of the image detection module 74 and the center of the laser measurement module 73 have a fixed offset Bx, By, then the image detection module 74 can be set The center of is O2(X-Bx, Y-By); a cross section is designated at any position along the Y direction of the curved glass 10, and the image detection module 74 above scans the physical boundary 1 and the physical boundary 2 to construct the symmetry center O2(X-Bx, Y-By), and the conversion relationship between O2(X-Bx, Y-By) and O(X, Y) is: the detector is translated along the X axis by one +Bx unit, that is, X-Bx+Bx=X, and the detector is translated along the Y axis by one +By unit, that is, Y-By+By=Y;

[0061] S2 Reference Fig.13 As shown: the theoretical contour curve and contour tolerance (theoretical value T) of the curved glass 10 are imported in advance through the system software, and the imported theoretical curve is automatically converted into the theoretical trajectory coordinates of the laser working point (X, Z, θ) through the software algorithm, where X represents the X-axis coordinate, Z represents the Z-axis coordinate, and θ represents the angle between the real-time normal of the theoretical contour curve and the X-axis (i.e., the normal rotation angle of the laser measurement module 73 under the corresponding X, Z coordinates; the center point of the theoretical curve is set to O (X, Z, θ, Y), at which time X = 0, Z = 0, θ = 0, and Y corresponds to any specified position of the Y-axis mechanical coordinate of the instrument, and any cross-section position can be specified according to the detection requirements, and Y = 0 is set;

[0062] S3 reference Fig.14As shown: the system matches and calculates the actual contour coordinate origin O1 (X1, Z1, θ1) of any specified cross section of the curved glass 10 and completely coincides with the theoretical trajectory coordinate origin O (X, Z, θ) of the laser working point; the curved glass 10 is placed on the stage 9, and the image detection module 74 above scans the physical boundary 1 and the physical boundary 2 to construct the symmetry center O2 (X-Bx, Y-By), and converts it to the laser coordinate center O (X, Y). Due to the difference in the appearance and posture of the curved glass 10 itself or the placement of the fixing fixture, the physical cross-section contour coordinates X≠0, Z≠0 and the vertical normal angle θ≠0° (Note: any position Y=Y1=0 can be set according to the Y-direction detection cross section of the curved glass 10); by Adjust the Z-axis drive device 6 of the instrument to make the origin coordinate Z=Z1=0 of the laser working point of the laser measurement module 73; adjust the X-axis drive device 8 to make the output end stage 9 drive the curved glass 10 to move to the origin coordinate X=X1=0 of the center of the physical contour section, and then translate along the X-axis for a length L (note: L≠0) relative to this origin coordinate. At this time, the laser will collect a height change value H relative to Z=Z1=0, and according to the trigonometric function formula, it can be calculated: △θ=a=arctan(H / L); at this time, the coordinate X1=X+△X, where △X=X.cos(△θ); Z1=Z+△Z, where △Z=Z.sin(△θ); θ1=θ+△θ, where it is set that when X=0, Y=0, θ=0;

[0063] S4 corrects the difference in the appearance and posture of the curved glass 10 itself or the difference in the placement of the fixing fixture, and the system recalculates and establishes the coordinates of each point on the actual motion trajectory of the laser working point as: O1(X1, Z1, θ1), where X1=X+cos(△θ), Z1=Z+Z.sin(△θ), θ1=θ+△θ;

[0064] S5 starts measuring, the laser measuring module follows the preset travel and rotation angle along the three axes of X, Z and θ, and the laser working point follows the coordinates O1 (X1, Z1, θ1) of each point on the actual motion trajectory to perform a full closed-loop difference compensation motion to ensure that the three coordinates reach the specified coordinate position at the same time. Specifically, the X-axis drive device 8 realizes the X1 coordinate positioning of the laser working point, the Z-axis drive device 6 realizes the Z1 coordinate positioning of the laser working point, and the drive module 76 realizes the rotation positioning of the laser working point at an angle of θ1;

[0065] S6 Reference Fig.15 As shown in the figure: fitting and calculation of profile tolerance, the laser working point scans along the coordinates O1 (X1, Z1, θ1) of each point on the corrected actual motion trajectory, and collects and calculates P1...P in the normal direction of the actual profile curve. n If the actual cross-sectional profile of the curved glass 10 is completely consistent with the theoretical profile, then P1...Pn = 0, T1 = 0, but this state basically does not exist, because the actual production process is complicated, often resulting in various errors, and these points will be randomly distributed in the positive and negative directions of the theoretical contour curve normal, then the software algorithm is used to implement a circular comparison, from the measured point P1 ... P n Filter out the maximum value P max and the minimum value P min The point P1...P corresponding to the normal line n Subtract, according to the national tolerance standard definition, calculate the measured profile tolerance value T1 of the curve, then T1=│P max -P0│+│P min -P0│, then T1 is the actual profile tolerance value of the curved glass 10. The software automatically determines the OK or NG state by comparing it with the theoretical profile tolerance T: that is, when T1≤T, the product state is determined to be OK; when T1>T, the product state is determined to be NG, where T1 and T are both ≥0.

[0066] The above embodiment only expresses one implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A 3D curved glass laser profile detector, comprising a chassis, wherein the chassis comprises a base (1) and an upper shell (2), characterized in that: The upper end of the base (1) is provided with a Y-axis driving device (3) and a supporting seat (4); the output end of the Y-axis driving device (3) is connected to a mounting frame (5); a Z-axis driving device (6) is fixed to the top of the mounting frame (5); the output end of the Z-axis driving device (6) is connected to a rotation measuring device (7); an X-axis driving device (8) is provided on the supporting seat (4); the output end of the X-axis driving device (8) is connected to a stage (9); The rotation measuring device (7) comprises a circular ring fixing plate (71) connected to the output end of the Z-axis driving device (6), a rotating ring (72) located inside the circular ring fixing plate (71), a laser measuring module (73) fixed to the top of the inner side of the rotating ring (72), an image detection module (74) connected to one end of the laser measuring module (73), a light source module (75) located directly below the image detection module (74), and a driving module (76) for driving the rotating ring (72) to rotate, wherein the driving module (76) is fixed to the bottom of the circular ring fixing plate (71), and the light source module (75) is fixed to the upper end of the driving module (76); The middle of the rotating ring (72) is a large circular hole, and the laser working point of the laser measurement module (73) is located at the center of the large circular hole; The object carrier (9) is located between the laser measurement module (73) and the light source module (75); The Y-axis driving device (3) comprises a Y-axis servo motor (31) fixed to the upper end of the base (1), a Y-axis lead screw (32) connected to the output shaft of the Y-axis servo motor (31), and a Y-axis slider (33) slidably connected to the Y-axis lead screw (32), wherein the Y-axis slider (33) is the output end of the Y-axis driving device (3); The Z-axis driving device (6) comprises a Z-axis servo motor (61) fixed to the top end of the mounting frame (5), a Z-axis screw rod (62) connected to the output shaft of the Z-axis servo motor (61), and a Z-axis slider (63) slidably connected to the Z-axis screw rod (62), wherein the Z-axis slider (63) is the output end of the Z-axis driving device (6); The X-axis driving device (8) comprises an X-axis servo motor (81) fixed on the support seat (4), an X-axis lead screw (82) connected to the output shaft of the X-axis servo motor (81), and an X-axis slider (83) slidably connected to the X-axis lead screw (82), wherein the X-axis slider (83) is the output end of the X-axis driving device (8); The driving module (76) comprises a driving motor (761) fixedly connected to the circular ring fixing plate (71), and a driving gear (762) connected to the output shaft of the driving motor (761), and the outer side surface of the rotating ring (72) is provided with a driven tooth (721) meshing with the driving gear (762).

2. A 3D curved glass laser profile detector according to claim 1, characterized in that: The image detection module (74) comprises a CCD camera (741) and a first reflector (742) located at the front end of the CCD camera (741), wherein the first reflector (742) reflects downward at a 45° angle.

3. The 3D curved glass laser profile detector according to claim 1, characterized in that: The light source module (75) comprises a light source (751) and a second reflector (752) located at the front end of the light source (751), wherein the second reflector (752) reflects upward at a 45° angle.

4. The 3D curved glass laser profile detector according to claim 1, characterized in that: The object carrier (9) is provided with a light-transmitting glass plate.

5. The 3D curved glass laser profile detector according to claim 1, characterized in that: The base (1) is provided with a power module (11) and a control module (12); a display panel (21) is fixed to the front end surface of the upper shell (2); a dust cover (13) is also sleeved on the outside of the support base (4); and a keyboard placement plate (14) is rotatably connected to the front end of the dust cover (13).

6. A detection method of the 3D curved glass laser profile detector according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1 Detector mechanism firmware calibration back to zero: Set the laser working point to the center of the rotating ring (72) and perpendicular to the stage (9), that is, perpendicular to the X axis, set X=0, Z=0, θ=0, Y=0, where Y can correspond to any specified position of the Y axis mechanical coordinate of the detector; at this time, the center of the image detection module (74) and the center of the laser measurement module (73) have a fixed offset Bx, By, and the center of the image detection module (74) can be set to O2 (X-Bx , Y-By); specify a cross section at any position along the Y direction of the curved glass (10), and scan the physical boundary 1 and the physical boundary 2 through the upper image detection module (74) to construct the symmetry center O2 (X-Bx, Y-By). At this time, the conversion relationship between O2 (X-Bx, Y-By) and O (X, Y) is: the detector is translated along the X axis by one +Bx unit, that is, X-Bx+Bx=X, and the detector is translated along the Y axis by one +By unit, that is, Y-By+By=Y; S2 pre-imports the theoretical contour curve and contour tolerance of the curved glass (10) through the system software, and automatically converts the imported theoretical curve into the theoretical trajectory coordinates of the laser working point (X, Z, θ) through the software algorithm, where X represents the X-axis coordinate, Z represents the Z-axis coordinate, and θ represents the angle between the real-time normal of the theoretical contour curve and the X-axis; sets the center point of the theoretical curve to O (X, Z, θ, Y), where X=0, Z=0, θ=0, and Y corresponds to any specified position of the Y-axis mechanical coordinate of the instrument, and any cross-section position can be specified according to the detection requirements, and Y=0 is set; The S3 system matches and calculates that the actual contour coordinate origin O1 (X1, Z1, θ1) of any specified cross section of the curved glass (10) completely coincides with the theoretical trajectory coordinate origin O (X, Z, θ) of the laser working point; the curved glass (10) is placed on the stage (9), and the image detection module (74) above is used to scan the physical boundary 1 and the physical boundary 2 to construct the symmetry center O2 (X-Bx, Y-By), and convert it into the laser coordinate center O (X, Y); by adjusting the instrument Z-axis drive device (6), the origin coordinate Z of the laser working point of the laser measurement module (73) is made Z=Z1=0; the X-axis drive device (8) is adjusted so that the output end stage (9) drives the curved glass (10) to move to the origin coordinate X=X1=0 of the center of the physical contour cross section, and then translates a length L along the X-axis relative to this origin coordinate, L≠0, at which time the laser will collect a height change value H relative to Z=Z1=0, and △θ can be calculated according to the trigonometric function formula; The S4 system recalculates and establishes the coordinates of each point on the actual motion trajectory of the laser working point as: O1(X1, Z1, θ1), where X1=X+cos(△θ), Z1=Z+Z.sin(△θ), θ1=θ+△θ; S5 starts measuring, the laser measuring module follows the preset travel and rotation angle along the three axes X, Z and θ, and the laser working point follows the coordinates O1 (X1, Z1, θ1) of each point on the actual motion trajectory to perform a full closed-loop difference compensation motion, ensuring that the three coordinates reach the designated coordinate position at the same time; specifically, the X-axis driving device (8) realizes the X1 coordinate positioning of the laser working point, the Z-axis driving device (6) realizes the Z1 coordinate positioning of the laser working point, and the driving module (76) realizes the rotation positioning of the θ1 angle of the laser working point; Fitting and calculation of S6 profile tolerance. The laser working point scans along the coordinates O1 (X1, Z1, θ1) of each point on the corrected actual motion trajectory, and collects and calculates P1...P n If the actual cross-sectional profile of the curved glass (10) is completely consistent with the theoretical profile, then P1...P n = 0, T1 = 0; if the actual cross-sectional profile of the curved glass (10) is not completely consistent with the theoretical profile, a software algorithm is used to implement a circular comparison, starting from the measured points P1...P n Filter out the maximum value P max and the minimum value P min The point P1...P corresponding to the normal line n Subtract and calculate the measured profile tolerance value T1 of the curve, then T1=│P max -P0│+│P min -P0│, then T1 is the actual profile tolerance value of the curved glass (10), and the software automatically determines the OK or NG state by comparing it with the theoretical profile tolerance T: that is, when T1≤T, the product state is determined to be OK; when T1>T, the product state is determined to be NG, where T1 and T are both ≥0.

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