CN211696239U - 3D curved surface glass laser profile tolerance detector - Google Patents

Abstract

The utility model provides a 3D curved surface glass laser profile tolerance detector, the base upper end is equipped with y axle drive arrangement, the z axle drive arrangement is connected with the rotation measuring device, the x axle drive arrangement is connected with the objective table; the rotation measuring device comprises a circular ring fixing plate, a rotating ring, a laser measuring module, an image detecting module, a light source module and a driving module; the middle part of the rotating ring is a large round hole, and the laser working point of the laser measuring module is positioned at the circle center of the large round hole. The utility model discloses a profile tolerance detector compares the tradition and uses motor shaft as center pivoted detection device, and laser measuring module fixes on changeing inboard top of board, changes the inboard lateral surface of board and has driven tooth, uses its measuring head to rotate as the centre of a circle during the detection for the measuring line that laser measuring module sent is unanimous with the normal line of arc surface measuring position all the time, can improve the detection precision of curved surface glass profile tolerance.

Description

3D curved surface glass laser profile tolerance detector

Technical Field

The utility model relates to a CCD advanced measuring equipment's technical field, concretely relates to 3D curved surface glass laser profile degree detector.

Background

3D curved surface glass is the development trend of current smart mobile phone, and market demand rises day by day. The profile of the curved surface is an important precision index of the curved glass, and the production process needs to be controlled in a key way. For the detection of curved glass, in the prior art, the current main detection device is a laser (non-contact) and probe (contact) detector driven by three coordinates, but because the probe (contact) detector has low efficiency and cannot meet the industrialization requirement, the laser (non-contact) becomes the mainstream detector in the current industry, the measurement principle is as shown in fig. 1-2, the laser can only translate in three directions, when the position of the curved glass 10 curved surface is detected, because the reflection and refraction characteristics of the transparent glass material surface determine, the laser detection head can only receive the signal within the angle range of the positive and negative maximum 20 degrees of the glass curved surface normal, therefore, the laser (non-contact) mode of three-axis translation based on three-coordinate driving cannot receive the return signal of the curved glass with the large curved surface (the curved surface normal and the horizontal angle exceed 20 degrees), most of curved glass with the normal direction and the horizontal angle of the cambered surface exceeding 20 degrees cannot be accurately measured in the mode, and can only be judged by the theoretical size of a production mold, so that the improvement and the improvement of the production quality are seriously hindered.

In order to overcome the defects, some manufacturers have introduced a rapid measuring device for 3D curved glass, as disclosed in application No. 201720501332.7, and have added a rotary table on which a non-contact displacement sensor is disposed to enable the non-contact displacement sensor to perform rotation measurement. However, since the non-contact displacement sensor of the device is directly attached to the rotary table, the measurement principle is as shown in fig. 3, the non-contact displacement sensor rotates around the rotary shaft of the rotary table, the arc length of the non-contact displacement sensor sensing end is set as d, the rotation angle is set as n, the distance (corresponding to the radius) between the rotary shaft of the rotary table and the non-contact displacement sensor sensing end is set as r, and d is n pi r/180, that is, when the rotary table rotates a small angle, the arc length of the non-contact displacement sensor sensing end can reach a considerable value, and the precision required for measuring the curved surface profile of the curved glass 10 is high, so that the measurement error is easily secondarily amplified for a common servo motor.

SUMMERY OF THE UTILITY MODEL

To above problem, the utility model provides a 3D curved surface glass laser profile degree detector, the error is little, and it is high to detect the precision, and detection efficiency is high.

In order to achieve the above object, the present invention provides the following technical solutions:

A3D curved surface glass laser profile tolerance detector comprises a case, wherein the case comprises a base and an upper shell, a Y-axis driving device and a supporting seat are arranged at the upper end of the base, the output end of the Y-axis driving device is connected with a mounting frame, a Z-axis driving device is fixed at the top end of the mounting frame, the output end of the Z-axis driving device is connected with a rotation measuring device, an X-axis driving device is arranged on the supporting seat, and the output end of the X-axis driving device is connected with an objective table;

the rotation measuring device comprises a circular ring fixing plate connected to the output end of the Z-axis driving device, a rotating ring positioned on the inner side of the circular ring fixing plate, a laser measuring module fixed at the top end of the inner side of the rotating ring, an image detecting module connected to one end of the laser measuring module, a light source module positioned right below the image detecting module and a driving module used for driving the rotating ring to rotate, wherein the driving module is fixed at the bottom of the circular ring fixing plate, and the light source module is fixed at the upper end of the driving module;

the middle part of the rotating ring is a large round hole, and a laser working point of the laser measuring module is positioned at the circle center of the large round hole;

the objective table is positioned between the laser measurement module and the light source module.

Specifically, the Y-axis driving device comprises a Y-axis servo motor fixed at the upper end of the base, a Y-axis screw rod connected to an output shaft of the Y-axis servo motor, and a Y-axis sliding block connected with the Y-axis screw rod in a sliding manner, wherein the Y-axis sliding block is an output end of the Y-axis driving device.

Specifically, Z axle drive arrangement is including fixing Z axle servo motor on mounting bracket top, connection Z axle lead screw on the Z axle servo motor output shaft and with Z axle lead screw sliding connection's Z axle slider, Z axle slider is Z axle drive arrangement's output.

Specifically, the X-axis driving device comprises an X-axis servo motor fixed on the supporting seat, an X-axis lead screw connected to an output shaft of the X-axis servo motor, and an X-axis slider slidably connected to the X-axis lead screw, wherein the X-axis slider is an output end of the X-axis driving device.

Specifically, the driving module comprises a driving motor fixedly connected with the circular ring fixing plate and a driving gear connected to an output shaft of the driving motor, and driven teeth meshed with the driving gear are arranged on the outer side face of the rotating ring.

Specifically, the image detection module comprises a CCD camera and a first reflector positioned at the front end of the CCD camera, and the first reflector is reflected downwards by 45 degrees.

Specifically, the light source module comprises a light source and a second reflector positioned at the front end of the light source, and the second reflector reflects upwards at 45 degrees.

Specifically, a light-transmitting glass plate is arranged on the objective table.

Specifically, be equipped with power module and control module in the base, the terminal surface is fixed with display panel before the epitheca, the supporting seat outside still overlaps and is equipped with a shield, the shield front end rotates and is connected with a keyboard and places the board.

The utility model has the advantages that:

firstly, the utility model discloses a 3D curved surface glass laser profile tolerance detector, utilize the image detection module to guide the location to curved surface glass position; adopting three-axis linkage differential motion, namely using an X-axis driving device and a Z-axis driving device to realize X, Z coordinate positioning, using a rotation measuring device to realize that a laser measuring module carries out scanning measurement along the normal direction of the curved glass by a contour track method, using a software algorithm to fit and draw a real contour curve of a measured object to be compared with a standard theoretical line through a plurality of points for drawing measurement, and obtaining a measuring result through computer software algorithm analysis, thereby systematically judging the detection result without manual detection and comparison, having high detection efficiency and high detection precision;

second, compare the tradition and use motor shaft as center pivoted detection device, this design has increased a swivel becket that centers on the well rotation, laser survey module fixes on the inboard top of swivel becket, and laser work point of laser survey module is located the centre of a circle position of swivel becket, the swivel becket lateral surface has the driven tooth, drive through motor, gear makes laser survey module use its measuring head to rotate as the centre of a circle, make the measuring line that laser survey module sent unanimous with the normal line of arc surface measuring position all the time, can improve the detection precision of curved surface glass profile tolerance.

Drawings

Fig. 1 is a schematic diagram of a measurement principle of a laser measuring head in the prior art, the measurement range is not limited, and values in the diagram are only used for reference according to actual selection.

Fig. 2 is a schematic diagram of a first prior art laser measuring apparatus.

Fig. 3 is a measurement schematic diagram of a second laser measuring instrument in the prior art.

Fig. 4 is the utility model discloses a 3D curved surface glass laser profile degree detector's schematic structure diagram.

Fig. 5 is a front view of the 3D curved glass laser profile degree detector of the present invention.

Fig. 6 is a cross-sectional view taken along the plane a-a in fig. 5.

Fig. 7 is the utility model discloses a 3D curved surface glass laser profile degree detector's internal structure chart one.

Fig. 8 is the utility model discloses a 3D curved surface glass laser profile degree detector's internal structure chart two.

Fig. 9 is a schematic structural diagram of the middle rotation measuring device of the present invention.

Fig. 10 is a schematic structural diagram of the middle rotation measuring device according to the present invention.

Fig. 11 is a schematic structural view of the middle laser measuring module, the image detecting module, the light source module, and the stage of the present invention.

Fig. 12 is a schematic view of the measurement principle of the present invention.

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

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

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

The reference signs are: the device comprises a base 1, a power supply module 11, a control module 12, a dust cover 13, a keyboard placing plate 14, an upper shell 2, a display panel 21, a Y-axis driving device 3, a Y-axis servo motor 31, a Y-axis screw rod 32, a Y-axis slider 33, a supporting seat 4, a mounting frame 5, a Z-axis driving device 6, a Z-axis servo motor 61, a Z-axis screw rod 62, a Z-axis slider 63, a rotation measuring device 7, a ring fixing plate 71, a rotating ring 72, driven teeth 721, a laser measuring module 73, an image detecting module 74, a CCD camera 741, a first reflecting mirror 742, a light source module 75, a light source 751, a second reflecting mirror 752, a driving module 76, a driving motor 761, a driving gear 762, an X-axis driving device 8, an X-axis servo motor 81, an X-axis screw rod 82, an X-axis slider 83, a stage 9 and curved.

Detailed Description

The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.

Referring to FIGS. 4-12:

A3D curved surface glass laser profile tolerance detector comprises a case, wherein the case comprises a base 1 and an upper shell 2, a Y-axis driving device 3 and a supporting seat 4 are arranged at the upper end of the base 1, the output end of the Y-axis driving device 3 is connected with an installation frame 5, a Z-axis driving device 6 is fixed at the top end of the installation frame 5, the output end of the Z-axis driving device 6 is connected with a rotation measuring device 7, an X-axis driving device 8 is arranged on the supporting seat 4, and the output end of the X-axis driving device 8 is connected with an objective table 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 positioned on the inner side of the circular ring fixing plate 71, a laser measuring module 73 fixed at the top end of the inner side of the rotating ring 72, an image detecting module 74 connected to one end of the laser measuring module 73, a light source module 75 positioned right below the image detecting module 74, and a driving module 76 used for driving the rotating ring 72 to rotate, wherein the driving module 76 is fixed at the bottom of the circular ring frame 71, and the light source module 75 is fixed at the upper end of the driving module 76;

the middle part of the rotating ring 72 is a large round hole, the measuring head of the laser measuring module 73 is positioned at the center of the round hole, the rotating ring 72 indirectly drives the laser measuring module 73 to rotate, and the rotating ring rotates by taking the working point of the measuring head of the laser measuring module 73 as the center of the circle, the radius of the rotating ring 72 is set to be R, the rotating angle of the laser measuring module 73 is N, the rotating radian of the rotating ring 72 is L, and N is 180L/pi R, so that the rotating angle N of the laser measuring module 73 can be reduced by increasing the radius R of the rotating ring 72, the precision of the rotating angle N is improved, namely the measuring precision is improved, and compared with the means of improving the motor precision, the operation is easier, and the cost is low;

the stage 9 is located between the laser measuring module 73 and the light source module 75.

Preferably, the Y-axis driving device 3 is used for driving the mounting frame 5 to move in the Y-axis direction, the Y-axis driving device 3 includes a Y-axis servomotor 31 fixed at the upper end of the base 1, a Y-axis lead screw 32 connected to an output shaft of the Y-axis servomotor 31, and a Y-axis slider 33 slidably connected to the Y-axis lead screw 32, and the Y-axis slider 33 is an output end of the Y-axis driving device 3.

Preferably, the Z-axis driving device 6 is used for moving the rotation measuring device 7 in the Z-axis direction, the Z-axis driving device 6 includes a Z-axis servomotor 61 fixed on the top end of the mounting frame 5, a Z-axis lead screw 62 connected to the output shaft of the Z-axis servomotor 61, and a Z-axis slider 63 slidably connected to the Z-axis lead screw 62, and the Z-axis slider 63 is the output end of the Z-axis driving device 6.

Preferably, the X-axis driving device 8 is used for driving the stage 9 to move in the X-axis direction, the X-axis driving device 8 includes an X-axis servomotor 81 fixed on the supporting seat 4, an X-axis lead screw 82 connected to an output shaft of the X-axis servomotor 81, and an X-axis slider 83 slidably connected to the X-axis lead screw 82, and the X-axis slider 83 is an output end of the X-axis driving device 8.

Preferably, the driving module 76 includes a driving motor 761 fixedly connected to the circular frame 71 and a driving gear 762 connected to an output shaft of the driving motor 761, a driven tooth 721 meshed with the driving gear 762 is provided on an outer side surface of the rotating ring 72, the rotating ring 72 is driven to rotate by the driving motor 761 and the driving gear 762, a radius of the rotating ring 72 is large, a rotation angle of the laser measuring module 73 is easily controlled by controlling a rotation amount of the driving gear 762, a measurement error can be reduced, and a final measurement accuracy is high.

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

Preferably, the light source module 75 includes a light source 751, and a second reflector 752 located at a front end of the light source 751, the second reflector 752 reflecting upward at 45 °.

Preferably, the objective table 9 is provided with a transparent glass plate, which is transparent to light, so that the light source module 75 below can provide brightness for the curved glass 10 on the upper side, and of course, the transparent glass plate can be eliminated, and the objective table 9 is provided with a transparent hole, but in order to adapt to the detection of curved glass 10 with various sizes and ensure the flatness of the placing surface, the transparent glass plate is necessary.

Preferably, a power module 11 and a control module 12 are arranged in the base 1, and a display panel 21 is fixed on the front end face of the upper casing 2.

Preferably, the outer side of the supporting seat 4 is further sleeved with a dust cover 13, the front end of the dust cover 13 is rotatably connected with a keyboard placing plate 14, the keyboard placing plate 14 is used for placing a keyboard, the keyboard is connected with the control module 12, and the display of the display panel 21 is matched, so that the operation is more convenient.

A detection method of a 3D curved surface glass laser profile degree detector comprises the following steps:

s1 calibrating the detector mechanism firmware to zero (i.e., resetting the zero position for each of the X, Z, θ, Y coordinates) by setting the laser operating point at the center of the rotating ring 72 (firmware setup) and perpendicular to the stage 9(X axis), setting X to 0, Z to 0, θ to 0, and Y to 0 (Y may correspond to any given position of the detector Y axis mechanical coordinates); at this time, the image detection module 74The center of the image detection module 74 can be set to be O if there is a fixed offset Bx, By between the center of the laser measurement module 73 and the center of the image detection module 74₂(X-Bx, Y-By); a section is appointed at any position of the curved glass 10 along the Y direction, and the object boundary 1 and the object boundary 2 are scanned by the upper image detection module 74 to form a symmetrical center O₂(X-Bx，Y-By)，O₂The conversion relation between (X-Bx, Y-By) and O (X, Y) is as follows: the detector translates one + Bx unit along the X axis to obtain X-Bx + Bx ═ X, and translates one + By unit along the Y axis to obtain Y-By + By ═ Y;

s2 referring to fig. 13: the method comprises the steps of introducing a theoretical profile curve and a profile tolerance (a theoretical value T) of the curved glass 10 in advance through system software, automatically converting the introduced theoretical curve into theoretical track coordinates of a laser working point through a software algorithm, wherein the theoretical track coordinates of the laser working point are (X, Z and theta), X represents an X-axis coordinate, Z represents a Z-axis coordinate, and theta represents an included angle between a real-time normal line of the theoretical profile curve and an X-axis (namely, a normal rotation angle of a laser measurement module 73 under the corresponding X and Z coordinates);

s3 referring to fig. 14: the system matches and calculates the actual contour coordinate origin O of any appointed section of the curved glass 10₁(X₁， Z₁，θ₁) Completely coinciding with the theoretical track coordinate origin O (X, Z, theta) of the laser working point; placing the curved glass 10 on the stage 9, scanning the object boundary 1 and the object boundary 2 by the upper image detection module 74 to construct the symmetry center O₂(X-Bx, Y-By) and converted to a laser coordinate center O (X, Y), where the shape and posture difference of the curved glass 10 itself or the placement difference of the fixing jig may cause the real sectional profile 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 section of the curved glass 10); the instrument Z-axis drive unit 6 is adjusted so that the origin coordinate Z of the laser operating point of the laser measuring module 73 is Z ₁0; adjusting the X-axis driving device 8 to make the output end objective table 9 drive the curved glass 10 to moveMoving to the origin coordinate X of the center of the profile section of the real object₁The two-dimensional coordinate system is translated by a length L (note: L ≠ 0) along the X-axis relative to the origin coordinate system, and the laser beam is acquired by a length L relative to Z ═ Z₁The height variation value H of 0 can be obtained from the trigonometric function formula △ theta-a-arctan (H/L), at which time the coordinate X₁X + △ X, wherein △ X is X. cos (△ θ); Z₁Z + △ Z, wherein △ Z is Z.sin (△ θ); θ₁θ + △ θ, where θ is 0 when X is 0 and Y is 0;

s4, correcting the shape posture difference of the curved glass 10 or the placing difference of the fixing clamp, and recalculating by the system to determine the coordinates of each point on the actual motion track of the laser working point as follows: o is₁(X₁，Z₁，θ₁) Wherein X is₁＝X+cos(△θ)，Z₁＝Z+Z.sin(△θ)，θ₁＝θ+△θ；

S5, starting to measure, measuring the preset travel and rotation angle of the laser module along X, Z and theta three axes, and measuring the coordinate O of each point on the actual motion track of the laser working point₁(X₁，Z₁，θ₁) Moving a full closed loop differential compensation motion to ensure that three coordinates reach a specified coordinate position at the same time, specifically realizing X of a laser working point by an X-axis driving device 8₁Coordinate positioning, the Z-axis drive device 6 realizes the Z of the laser working point₁Coordinate positioning, theta of the laser working point being effected by the drive module 76₁Rotating and positioning the angle;

s6 referring to fig. 15: fitting and calculating the tolerance of the profile tolerance, and correcting the coordinates O of each point on the actual motion track of the laser working point along the corrected laser working point₁(X₁，Z₁，θ₁) Scanning while walking, collecting and calculating P in the normal direction of the actual contour curve₁......P_nA measurement point, if the actual cross-sectional profile of the curved glass 10 is completely consistent with the theoretical profile, then P is measured₁......P_nAll is 0, T1 is 0, but this state basically does not exist because the actual production process is complex, various errors are generated, and these points are randomly distributed in the positive and negative directions normal to the theoretical profile curve, so that the general operation is performed at this timeThe software algorithm is used for realizing the cyclic comparison, and the actual measurement point P is obtained₁......P_nScreening out maximum value P_maxAnd a minimum value P_minPoint of (a) and P corresponding to the normal line₁......P_nSubtracting, and calculating the profile tolerance value T of the curve actual measurement according to the definition of the national tolerance standard₁Then T is₁＝│P_max-P₀│+│P_min-P₀L, then T at this time₁The software compares the real profile tolerance value of the curved glass 10 with the theoretical profile tolerance T to automatically judge the OK or NG state when T is₁When the T is less than or equal to T, judging the product state to be OK; when T is₁When T is greater than T, the product state is judged to be NG, wherein T₁And T is more than or equal to 0.

The above embodiments only represent one embodiment of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (9)

1. The 3D curved surface glass laser profile tolerance detector comprises a case, wherein the case comprises a base (1) and an upper shell (2), and is characterized in that a Y-axis driving device (3) and a supporting seat (4) are arranged at the upper end of the base (1), the output end of the Y-axis driving device (3) is connected with a mounting frame (5), a Z-axis driving device (6) is fixed at the top end of the mounting frame (5), the output end of the Z-axis driving device (6) is connected with a rotation measuring device (7), an X-axis driving device (8) is arranged on the supporting seat (4), and the output end of the X-axis driving device (8) is connected with a carrying table (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 on the inner side of the circular ring fixing plate (71), a laser measuring module (73) fixed to the top end of the inner side of the rotating ring (72), an image detecting module (74) connected to one end of the laser measuring module (73), a light source module (75) located right below the image detecting module (74), and a driving module (76) used for driving the rotating ring (72) to rotate, 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 part of the rotating ring (72) is a large round hole, and a laser working point of the laser measuring module (73) is positioned at the circle center of the large round hole;

the stage (9) is located between the laser measurement module (73) and the light source module (75).

2. The 3D curved glass laser profile tolerance detector according to claim 1, wherein the Y-axis driving device (3) comprises a Y-axis servo motor (31) fixed at 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 with the Y-axis lead screw (32), and the Y-axis slider (33) is the output end of the Y-axis driving device (3).

3. The 3D curved glass laser profile degree detector according to claim 1, wherein the Z-axis driving device (6) comprises a Z-axis servo motor (61) fixed on the top end of the mounting frame (5), a Z-axis lead screw (62) connected to an output shaft of the Z-axis servo motor (61), and a Z-axis sliding block (63) in sliding connection with the Z-axis lead screw (62), and the Z-axis sliding block (63) is an output end of the Z-axis driving device (6).

4. The 3D curved glass laser profile degree detector according to claim 1, wherein the X-axis driving device (8) comprises an X-axis servo motor (81) fixed on the supporting seat (4), an X-axis lead screw (82) connected to an output shaft of the X-axis servo motor (81), and an X-axis sliding block (83) connected with the X-axis lead screw (82) in a sliding manner, and the X-axis sliding block (83) is an output end of the X-axis driving device (8).

5. The 3D curved glass laser profile degree detector according to claim 1, characterized in that the driving module (76) comprises a driving motor (761) fixedly connected with the circular ring fixing plate (71) and a driving gear (762) connected to an output shaft of the driving motor (761), and the outer side of the rotating ring (72) is provided with a driven tooth (721) engaged with the driving gear (762).

6. The 3D curved glass laser profile degree detector according to claim 1, wherein the image detection module (74) comprises a CCD camera (741) and a first reflector (742) at the front end of the CCD camera (741), and the first reflector (742) reflects downwards at 45 degrees.

7. The 3D curved glass laser profile detector according to claim 1, wherein the light source module (75) comprises a light source (751) and a second reflector (752) at the front end of the light source (751), the second reflector (752) is upwardly reflected at 45 °.

8. The laser profilometry instrument for 3D curved glass according to claim 1, wherein a transparent glass plate is arranged on the stage (9).

9. The laser profilometry instrument for 3D curved glass according to claim 1, wherein a power module (11) and a control module (12) are arranged in the base (1), a display panel (21) is fixed on the front end face of the upper casing (2), a dust cover (13) is further sleeved on the outer side of the supporting seat (4), and a keyboard placing plate (14) is rotatably connected to the front end of the dust cover (13).

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