Automatic alignment fixture and positioning method for polishing sheet

Abstract

The present invention discloses an automatic alignment jig for a polishing sheet, comprising a shell, a base being provided below the shell, a fixed block being provided near one end inside the shell, the fixed end being connected to a connecting rod, the other end of the connecting rod being connected to a clamping mechanism, the clamping mechanism comprising a fixing ring connected to the connecting rod, a plurality of centering mechanisms being provided on the fixing ring, the centering mechanisms being arranged through the side walls of the fixing ring, and the plurality of centering mechanisms clamping an optical lens together; during the clamping process, the clamping mechanism realizes automatic centering and positioning of the optical lens.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lens manufacturing equipment, and in particular relates to an automatic alignment fixture and positioning method for a polishing sheet. Background Art

[0002] The manufacturing process of optical lenses is complex and requires multiple rough grinding, fine grinding, precision grinding, grinding, polishing, cleaning, etc. At present, when grinding optical lenses, the optical lenses are generally clamped on the grinding disc by the operator's sense, and manual marking and positioning are required. The operation process is relatively cumbersome, and it is difficult for inexperienced operators to align the center of the optical lens at one time, which will result in a lot of wasted operation time. If the position of the optical lens is not aligned with the grinding disc, it may be ground off, resulting in defective products and affecting the normal use of the optical lens; when grinding, the existing optical lens equipment can only manually adjust the position of the grinding disc for optical lenses of different sizes, or replace grinding discs of different sizes. Especially for grinding optical lenses of larger areas, it is necessary to repeatedly adjust the position of the grinding disc to complete the grinding of the entire optical lens, which has low work efficiency and weak applicability of the equipment.

[0003] Chinese patent application No. 202123200896.2 discloses an optical lens grinding and cleaning machine, including a disc and a driving mechanism for driving the disc to rotate, and a plurality of lens fixing brackets for fixing optical lenses are evenly arranged along the circumference on the circumferential wall of the disc, and the lens fixing bracket includes a bracket body and a rotating body, one end of the bracket body is fixedly arranged on the disc, and the other end is rotatably connected to the rotating body, and a clamping assembly for clamping the optical lens is provided on the rotating body, and a cleaning water tank is provided directly below the disc, and the lower lens fixing bracket can extend into the cleaning water tank, and an edge grinding mechanism that can grind the optical lens on the clamping assembly is provided on one side of the cleaning water tank, and the lens fixing bracket can drive the optical lens of the clamping assembly to pass through the edge grinding mechanism and the cleaning water tank in sequence. In the above-mentioned prior art, the optical lens cannot be fixed by centering, which affects the subsequent grinding accuracy, and the grinding disc needs to be adjusted at all times for grinding during grinding, and the adaptability is low. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an automatic alignment jig and positioning method for a polishing disc. Through the provided clamping mechanism and centering mechanism, the optical lens can be automatically centered and clamped, which is convenient for the subsequent polishing process, reduces polishing errors, improves polishing accuracy, and improves the fixation of the optical lens; through the provided adjustment mechanism, the optical lens can be automatically aligned by controlling the motor, and different positions of the optical lens can be polished with different curvatures, thereby improving the polishing efficiency of the optical lens and reducing the probability of producing defective products.

[0005] The present invention provides the following technical solutions:

[0006] An automatic alignment jig for a polishing sheet comprises a shell, a base is arranged below the shell, a fixed block is arranged near one end of the shell, a connecting rod is connected to the fixed end, a clamping mechanism is connected to the other end of the connecting rod, the clamping mechanism comprises a fixing ring, the fixing ring is connected to the connecting rod, a plurality of centering mechanisms are arranged on the fixing ring, the centering mechanisms penetrate the side wall of the fixing ring, and the plurality of centering mechanisms clamp an optical lens together; during the clamping process, the clamping mechanism realizes automatic centering and positioning of the optical lens;

[0007] An adjustment mechanism is provided on the side of the shell body away from the fixed block, and the adjustment mechanism is connected to the inner wall of the shell body. The adjustment mechanism includes a box body, and the box body is a rectangular structure. A hollow cavity is opened at the center of the box body, and the side walls of the hollow cavity of the box body are opened with through grooves, and a plurality of telescopic parts are provided in the through grooves, and the telescopic parts can form a sliding connection with the through grooves. One end of the plurality of telescopic parts extends into the box body and is connected to a driving mechanism, and the other end of the plurality of telescopic parts is connected to an adjustment block, and the adjustment block can move inside the hollow cavity, and a linear motor is connected to the side of the moving block close to the clamping mechanism, and a servo motor is provided at the other end of the linear motor, and a grinding disc is connected to the output shaft of the servo motor, and the adjustment mechanism adjusts the grinding disc to align with the optical lens.

[0008] Preferably, three sets of centering mechanisms are provided on the fixed ring, and the three sets of centering mechanisms are arranged at an angle of 120° to each other. The centering mechanism includes a telescopic rod, which passes through the fixed ring, and the telescopic rod and the fixed ring form a gap sliding connection. One end of the telescopic rod is connected to a telescopic cylinder, which is arranged on the outside of the fixed ring, and the telescopic cylinder is fixedly connected to the fixed ring; the other end of the telescopic rod is connected to a fixed block, and the first rotating rod and the second rotating rod are symmetrically provided at positions near both ends of the fixed block, and the ends of the first rotating rod and the second rotating rod are both connected to pressure wheels, and the surfaces of the pressure wheels are provided with a rubber layer.

[0009] Preferably, a first sliding groove is provided on the first rotating rod, a second sliding groove is provided on the second rotating rod, a support rod is provided between the first rotating rod and the second rotating rod, both ends of the support rod are connected with fixing bolts, the support rod can form a sliding connection with the first sliding groove and the second sliding groove through the fixing bolts, and the support rod can be fixed to the first rotating rod and the second rotating rod through the fixing bolts.

[0010] Preferably, there are four groups of telescopic parts inside the through groove, and the four telescopic parts are respectively located around the hollow cavity; the four telescopic parts are respectively a first elastic part, a second elastic part, a third elastic part, and a fourth elastic part, the first elastic part and the second elastic part are centrally symmetrically arranged, and the third elastic part and the fourth elastic part are centrally symmetrically arranged.

[0011] Preferably, the telescopic part includes a sliding rod, the sliding rod is arranged in a through groove, the sliding rod and the through groove form a sliding connection, one end of the sliding rod is connected to a driving mechanism, the other end of the sliding rod is connected to a sleeve, the other end of the sleeve is provided with a guide rod, the guide rod is slidably connected to the sleeve, the other end of the guide rod is connected to an adjusting block, the guide rod and the outer side wall of the sleeve are provided with a spring, one end of the spring is connected to the sliding rod, and the other end of the spring is connected to the guide rod.

[0012] Preferably, a first motor is provided at a position near a corner on the outside of the box body, the first motor output shaft is connected to a first rotating shaft, a first bevel gear is provided at one end of the first rotating shaft near the first motor, the first bevel gear is meshingly connected to the second bevel gear, the second bevel gear is connected to a first screw rod, and the other end of the first screw rod is rotatably connected to the inner wall of the box body through a set bearing; a moving block is provided on the first screw rod, an internal threaded hole is opened at the center position of the moving block, the moving block is rotatably connected to the first screw rod through the internal threaded hole, and the outer wall of the moving block is connected to the sliding rod of the first elastic member.

[0013] Preferably, a third bevel gear is provided on the end of the first rotating shaft away from the first motor, the third bevel gear is meshingly connected with a fourth bevel gear, the fourth bevel gear is connected to a second screw rod, the other end of the second screw rod is rotatably connected to the inner wall of the box body through a set bearing, the first screw rod and the second screw rod are arranged corresponding to each other; the moving block on the second screw rod is matched and rotatably connected with the second screw rod, and the outer side wall of the moving block on the second screw rod is connected to the sliding rod of the second elastic member.

[0014] Preferably, a second motor is provided at a diagonal position of the first motor, the output shaft of the second motor is connected to a second rotating shaft, a fifth bevel gear is provided on an end of the second rotating shaft close to the second motor, the fifth bevel gear is meshingly connected to a sixth bevel gear, the sixth bevel gear is connected to a third screw rod, the other end of the third screw rod is rotatably connected to the inner wall of the box body through a set bearing, the moving block on the third screw rod is matched and rotatably connected to the third screw rod, and the outer side wall of the moving block on the third screw rod is connected to the sliding rod of the third elastic member.

[0015] Preferably, a seventh bevel gear is provided on the end of the second rotating shaft away from the second motor, the seventh bevel gear is meshingly connected with the eighth bevel gear, the eighth bevel gear is connected to a fourth screw rod, the other end of the fourth screw rod is rotatably connected to the inner wall of the box body through a set bearing, the moving block on the fourth screw rod is matched and rotatably connected to the fourth screw rod, and the outer side wall of the moving block on the fourth screw rod is connected to the sliding rod of the fourth elastic member.

[0016] Preferably, the first elastic member and the second elastic member are in the same plane, the third elastic member and the fourth elastic member are staggered with the first elastic member and the second elastic member, and the third elastic member and the fourth elastic member are in different planes from the first elastic member and the second elastic member.

[0017] Preferably, the automatic alignment fixture further comprises a control system, the control system comprising a measuring module, a control module, a feedback module, and a driving module, the measuring module comprising an ultrasonic rangefinder and a camera, the ultrasonic rangefinder and the camera being arranged on a linear motor, the ultrasonic rangefinder being used to measure the linear distance between the grinding disc and the optical lens in real time, the measured distance being fed back to the control module, the control module issuing an instruction to the driving module, the driving module completing the movement in the horizontal plane through the first motor and the second motor of the adjustment mechanism, and adjusting the distance between the grinding disc and the optical lens through the servo motor; the feedback module comprising a displacement sensor, the displacement sensor being arranged on the moving block, monitoring the distance moved by the adjustment block at any time. When the control system controls the automatic alignment adjustment of the grinding disc and the optical lens through the adjustment mechanism, the linear distance between the grinding disc and the optical lens is measured by the ultrasonic rangefinder, and inputted into the control module for data analysis and processing, the control module issuing an instruction to control the driving module to adjust the movement position of the grinding disc, and at the same time issuing the next measurement instruction to the measuring module, the driving module adjusting in three-dimensional space according to the control instruction until the grinding disc and the optical lens are fully and automatically aligned, and the feedback module feeding back the movement information of the grinding disc in three-dimensional space to the control module. When measuring the distance between the grinding plate and the optical lens, since there is a cross mark at the center of the optical lens, the optical lens information is captured by a camera and transmitted to the control module for image analysis. The measurement deviation α is obtained by obtaining the scale value change of the cross mark. In order to improve the alignment accuracy of the grinding plate and the optical lens according to the sizes of different optical lenses, the standard distance between the grinding plate and the optical lens is A, and the actual measured distances of the two times are A1 and A2; α is the measurement deviation, and the actual deviation angle θ between the grinding plate and the optical lens satisfies: θ·A=β·cot(A1-A2)±δ; in the above formula, β is the relationship coefficient, and the value range is 0.366-2.653; θ is in degrees; and the distance is in cm. In order to achieve more accurate and faster docking between the grinding disc and the optical lens, the adjustment block is taken as the origin, the extension direction of the first rotating shaft is the x-axis, the extension direction of the second rotating shaft is the y-axis, and the moving direction of the linear motor is the z-axis. The moving position of the grinding disc is expressed as (x, y, z), where x is the distance moved by the moving block on the first rotating shaft, y is the distance moved on the second rotating shaft, and z is the distance moved by the linear motor. In order to further achieve rapid docking between the grinding disc and the optical lens, the standard distance between the grinding disc and the optical lens is A and x, y, and z satisfy: A=λ·(x 2 +y 2 +z 2 ) 1 / 2 / cosθ; λ is the relationship coefficient, ranging from 0.932 to 1.563; the distance unit is cm.

[0018] Preferably, the positioning method of the automatic alignment fixture comprises the following steps: step 1, placing the optical lens between the three centering mechanisms, the fixing bolts are in a loose state in the initial state, the fixing bolts can slide in the first slide groove and the second slide groove, and the telescopic rod is driven by the telescopic cylinder to move close to the optical lens. When the optical lens is pressed, the first rotating rod and the second rotating rod can be rotated and adjusted according to the size of the optical lens, so that the pressing wheel can fit the side wall of the optical lens more closely, thereby helping to automatically realize the center of the optical lens; when the optical lens is relatively stable, the fixing bolts are screwed to fix the support rod to the first rotating rod and the second rotating rod;

[0019] Step 2: When the control system controls the automatic alignment and adjustment of the grinding disc and the optical lens through the adjustment mechanism, the straight-line distance between the grinding disc and the optical lens is measured by the ultrasonic rangefinder, and the distance is input to the control module for data analysis and processing. The control module issues an instruction to control the drive module to adjust the movement position of the grinding disc, and at the same time issues the next measurement instruction to the measurement module. The drive module adjusts in three-dimensional space according to the control instruction until the grinding disc and the optical lens are fully and automatically aligned. The feedback module feeds back the movement information of the grinding disc in three-dimensional space to the control module.

[0020] Step three, when the adjusting mechanism is adjusting, the first motor rotates to drive the first rotating shaft to rotate, and the first rotating shaft drives the first screw rod and the second screw rod to rotate synchronously through the bevel gear at the same time, and the first screw rod and the second screw rod synchronously drive the adjusting block to move axially along the first screw rod, and when the adjusting block moves close to the first rotating shaft, the third elastic member is compressed and the fourth elastic member is extended, and when the adjusting block moves away from the first rotating shaft, the states of the third elastic member and the fourth elastic member are opposite to the above process; the second motor rotates to drive the second rotating shaft to rotate, and the second rotating shaft drives the third screw rod and the fourth screw rod to rotate synchronously through the bevel gear at the same time, and the third screw rod and the fourth screw rod synchronously drive the adjusting block to move axially along the third screw rod, and when the adjusting block moves close to the second rotating shaft, the second elastic member is compressed and the first elastic member is extended, and when the adjusting block moves away from the second rotating shaft, the states of the first elastic member and the second elastic member are opposite to the above process; the distance that the grinding plate moves in the direction perpendicular to the optical lens is directly measured by the linear motor data.

[0021] In the above step 1, in order to improve the accuracy of automatic centering of the center of optical lenses of different sizes, so as to better facilitate the identification and positioning of the grinding disc and its center, the center of the optical lens is r1, the center of the fixing ring is r2, and in the process of fixing the optical lens, the angle between the first rotating rod and the second rotating rod is θ 1The telescopic rod is extended by a distance d, and the lengths of the first rotating rod and the second rotating rod are both L1; the efficiency of automatic alignment is improved, and the angles r1 and r2 and the first rotating rod and the second rotating rod are θ 1 The relationship between satisfies: r2-r1=d+cos(θ 1 / 2)L1.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention discloses an automatic alignment jig and positioning method for a polishing sheet. Through the provided clamping mechanism and centering mechanism, the optical lens can be automatically centered and clamped, which is convenient for the subsequent polishing process, reduces polishing errors, improves polishing accuracy, and improves the fixation of the optical lens. The present invention discloses an automatic alignment jig and positioning method for a polishing sheet. Through the provided adjustment mechanism, the optical lens can be automatically aligned by controlling a motor, different arcs can be ground at different positions of the optical lens, the polishing efficiency of the optical lens can be improved, and the probability of producing defective products can be reduced. By limiting the standard distance between the polishing sheet and the optical lens to A, and the relationship between the two actual measured distances to A1 and A2, the accuracy of the alignment between the polishing sheet and the optical lens can be improved according to the sizes of different optical lenses. By limiting the angles between r1 and r2 and the first rotating rod and the second rotating rod to θ 1 The relationship between them can improve the accuracy of automatic centering of the center of optical lenses of different sizes, thereby making it easier to identify and locate the grinding disc and its center, thereby improving accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the clamping mechanism of the present invention.

[0027] Figure 3 It is a schematic diagram of the centering mechanism of the present invention.

[0028] Figure 4 It is a schematic diagram of the box structure of the present invention.

[0029] Figure 5 It is a schematic diagram of the regulating mechanism of the present invention.

[0030] Figure 6The internal schematic diagram of the regulating mechanism of the present invention Figure 1 .

[0031] Figure 7 The internal schematic diagram of the regulating mechanism of the present invention Figure 2 .

[0032] Figure 8 It is a schematic diagram of the grinding plate connection structure of the present invention.

[0033] Fig. 9 It is a partial enlarged structural schematic diagram of the present invention.

[0034] Fig.10 It is a schematic diagram of the elastic member structure of the present invention.

[0035] Fig.11 It is a control system block diagram of the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1:

[0039] like Figure 1-3 As shown, an automatic alignment fixture for a polishing sheet comprises a shell 1, a base 2 is provided below the shell 1, a fixed block 543 is provided near one end of the shell 1, the fixed end is connected to a connecting rod 4, the other end of the connecting rod 4 is connected to a clamping mechanism 5, the clamping mechanism 5 comprises a fixing ring 51, the fixing ring 51 is connected to the connecting rod 4, a plurality of centering mechanisms 52 are provided on the fixing ring 51, the centering mechanisms 52 penetrate the side wall of the fixing ring 51, and the plurality of centering mechanisms 52 clamp an optical lens 33 together; during the clamping process, the clamping mechanism 5 realizes automatic centering and positioning of the optical lens 33;

[0040] An adjusting mechanism 6 is provided on the side of the shell 1 away from the fixed block 543, and the adjusting mechanism 6 is connected to the inner wall of the shell 1. The adjusting mechanism 6 includes a box body 34, and the box body 34 is a rectangular structure. A hollow cavity is opened at the center of the box body 34, and the side walls of the hollow cavity of the box body 34 are opened with through grooves 10, and a plurality of telescopic parts are provided in the through grooves 10, and the telescopic parts can form a sliding connection with the through grooves 10. One end of the plurality of telescopic parts extends into the box body 34 and is connected to a driving mechanism, and the other end of the plurality of telescopic parts is connected to an adjusting block 15, and the adjusting block 15 can move inside the hollow cavity. A linear motor 7 is connected to the side of the moving block 21 close to the clamping mechanism 5, and a servo motor 8 is provided at the other end of the linear motor 7. A grinding disc 9 is connected to the output shaft of the servo motor 8, and the adjusting mechanism 6 adjusts the grinding disc 9 to align with the optical lens 33.

[0041] A total of three sets of centering mechanisms 52 are provided on the fixed ring 51, and the three sets of centering mechanisms 52 are arranged at an angle of 120° to each other. The centering mechanisms 52 include a telescopic rod 53, which passes through the fixed ring 51, and the telescopic rod 53 and the fixed ring 51 form a gap sliding connection, one end of the telescopic rod 53 is connected to a telescopic cylinder 512, the telescopic cylinder 512 is arranged on the outside of the fixed ring 51, and the telescopic cylinder 512 is fixedly connected to the fixed ring 51; the other end of the telescopic rod 53 is connected to a fixed block 543, and the fixed block 543 is symmetrically provided with a first rotating rod 55 and a second rotating rod 56 near the two ends, and the ends of the first rotating rod 55 and the second rotating rod 56 are both connected to a pressure wheel 511, and the surface of the pressure wheel 511 is provided with a rubber layer.

[0042] A first sliding groove 57 is provided on the first rotating rod 55, a second sliding groove 58 is provided on the second rotating rod 56, a support rod 59 is provided between the first rotating rod 55 and the second rotating rod 56, both ends of the support rod 59 are connected with fixing bolts 510, and the support rod 59 can form a sliding connection with the first sliding groove 57 and the second sliding groove 58 through the fixing bolts 510, and the support rod 59 can be fixed to the first rotating rod 55 and the second rotating rod 56 by the fixing bolts 510.

[0043] Embodiment 2:

[0044] like Figure 4-10 As shown, on the basis of embodiment one, there are four groups of telescopic parts inside the through groove 10, and the four telescopic parts are respectively located around the hollow cavity; the four telescopic parts are respectively a first elastic part 11, a second elastic part 12, a third elastic part 13, and a fourth elastic part 14, the first elastic part 11 and the second elastic part 12 are centrally symmetrically arranged, and the third elastic part 13 and the fourth elastic part 14 are centrally symmetrically arranged.

[0045] The telescopic member includes a sliding rod 111, which is arranged in the through groove 10, and the sliding rod 111 and the through groove 10 are slidably connected. One end of the sliding rod 111 is connected to a driving mechanism, and the other end of the sliding rod 111 is connected to a sleeve 112. The other end of the sleeve 112 is provided with a guide rod 113, and the guide rod 113 is slidably connected to the sleeve 112. The other end of the guide rod 113 is connected to the adjustment block 15. The guide rod 113 and the outer side wall of the sleeve 112 are provided with a spring 114, one end of the spring 114 is connected to the sliding rod 111, and the other end of the spring 114 is connected to the guide rod 113.

[0046] A first motor 16 is provided on the outside of the box body 34 near a corner, and the output shaft of the first motor 16 is connected to a first rotating shaft 17, and an end of the first rotating shaft 17 near the first motor 16 is provided with a first bevel gear 18, and the first bevel gear 18 is meshingly connected with a second bevel gear 19, and the second bevel gear 19 is connected to a first screw rod 20, and the other end of the first screw rod 20 is rotatably connected to the inner wall of the box body 34 through a bearing; a moving block 21 is provided on the first screw rod 20, and an internal threaded hole is opened at the center position of the moving block 21, and the moving block 21 is rotatably connected to the first screw rod 20 through the internal threaded hole, and the outer wall of the moving block 21 is connected to the sliding rod 111 of the first elastic member 11.

[0047] A third bevel gear 22 is provided on the end of the first rotating shaft 17 away from the first motor 16, and the third bevel gear 22 is meshedly connected with a fourth bevel gear 23, and the fourth bevel gear 23 is connected with a second screw rod 24. The other end of the second screw rod 24 is rotatably connected to the inner wall of the box body 34 through a set bearing, and the first screw rod 20 and the second screw rod 24 are arranged corresponding to each other; the moving block 21 on the second screw rod 24 is matched and rotatably connected with the second screw rod 24, and the outer side wall of the moving block 21 on the second screw rod 24 is connected to the sliding rod 111 of the second elastic member 12.

[0048] A second motor 25 is provided at a diagonal position of the first motor 16, and the output shaft of the second motor 25 is connected to a second rotating shaft 26, and an end of the second rotating shaft 26 close to the second motor 25 is provided with a fifth bevel gear 27, and the fifth bevel gear 27 is meshingly connected to a sixth bevel gear 28, and the sixth bevel gear 28 is connected to a third screw rod 31, and the other end of the third screw rod 31 is rotatably connected to the inner wall of the box body 34 through a set bearing, the moving block 21 on the third screw rod 31 is matched and rotatably connected to the third screw rod 31, and the outer wall of the moving block 21 on the third screw rod 31 is connected to the sliding rod 111 of the third elastic member 13.

[0049] A seventh bevel gear 29 is provided on the end of the second rotating shaft 26 away from the second motor 25, and the seventh bevel gear 29 is meshedly connected with the eighth bevel gear 30, and the eighth bevel gear 30 is connected to the fourth screw rod 32, and the other end of the fourth screw rod 32 is rotatably connected to the inner wall of the box body 34 through a provided bearing, and the moving block 21 on the fourth screw rod 32 is matched and rotatably connected to the fourth screw rod 32, and the outer wall of the moving block 21 on the fourth screw rod 32 is connected to the sliding rod 111 of the fourth elastic member 14.

[0050] The first elastic member 11 and the second elastic member 12 are in the same plane, the third elastic member 13 and the fourth elastic member 14 are staggered with the first elastic member 11 and the second elastic member 12, and the third elastic member 13 and the fourth elastic member 14 are in different planes from the first elastic member 11 and the second elastic member 12.

[0051] Embodiment 3

[0052] like Fig.11As shown, on the basis of Example 1, the automatic alignment fixture also includes a control system, which includes a measuring module, a control module, a feedback module, and a driving module. The measuring module includes an ultrasonic rangefinder and a camera, which are arranged on a linear motor 7. The ultrasonic rangefinder measures the linear distance between the grinding disc 9 and the optical lens 33 in real time, and the measured distance is fed back to the control module. The control module sends an instruction to the driving module, and the driving module completes the movement in the horizontal plane through the first motor 16 and the second motor 25 of the adjustment mechanism 6, and adjusts the distance between the grinding disc 9 and the optical lens 33 through the servo motor 8; the feedback module includes a displacement sensor, which is arranged on the moving block 21 to monitor the distance moved by the adjustment block 15 at any time. When the control system controls the automatic alignment and adjustment of the grinding disc 9 and the optical lens 33 through the adjustment mechanism 6, the straight-line distance between the grinding disc 9 and the optical lens 33 is measured by the ultrasonic rangefinder, and input into the control module for data analysis and processing. The control module sends out instructions to control the driving module to adjust the movement position of the grinding disc 9, and sends out the next measurement instruction to the measuring module at the same time. The driving module adjusts in three-dimensional space according to the control instruction until the grinding disc 9 and the optical lens 33 are completely automatically aligned. The feedback module feeds back the movement information of the grinding disc 9 in three-dimensional space to the control module. When measuring the distance between the grinding disc 9 and the optical lens 33, since there is a cross mark at the center of the optical lens 33, the information of the optical lens 33 is captured by a camera and transmitted to the control module for image analysis. The measurement deviation α is obtained by obtaining the change in the scale value of the cross mark. In order to improve the alignment accuracy of the grinding disc 9 and the optical lens 33 according to the sizes of different optical lenses 33, the standard distance between the grinding disc 9 and the optical lens 33 is A, and the actual measured distances of the two times are A1 and A2; α is the measurement deviation, and the actual deviation angle θ between the grinding disc 9 and the optical lens 33 satisfies: θ·A=β·cot(A1-A2)±δ; in the above formula, β is the relationship coefficient, and the value range is 0.366-2.653; θ is in degrees; and the distance is in cm. In order to achieve more accurate and faster docking of the grinding disc 9 and the optical lens 33, the adjustment block 15 is taken as the origin, the extension direction of the first rotating shaft 17 is the x-axis, the extension direction of the second rotating shaft 26 is the y-axis, and the moving direction of the linear motor 7 is the z-axis. The moving position of the grinding disc 9 is expressed as (x, y, z), where x is the distance moved by the moving block 21 on the first rotating shaft 17, y is the distance moved on the second rotating shaft 26, and z is the distance moved by the linear motor 7; in order to further achieve rapid docking of the grinding disc 9 and the optical lens 33, the standard distance between the grinding disc 9 and the optical lens 33 is A and x, y, z satisfy: A=λ·(x 2 +y 2 +z 2 ) 1 / 2 / cosθ; λ is the relationship coefficient, ranging from 0.932 to 1.563; the distance unit is cm.

[0053] Embodiment 4

[0054] On the basis of the first embodiment, the positioning method of the automatic alignment fixture comprises the following steps: step 1, the optical lens 33 is placed between the three centering mechanisms 52, the fixing bolt 510 is in a loose state in the initial state, the fixing bolt 510 can slide in the first slide groove 57 and the second slide groove 58, and the telescopic rod 53 is driven by the telescopic cylinder 512 to move close to the optical lens 33, and when the optical lens 33 is pressed, the first rotating rod 55 and the second rotating rod 56 can be rotated and adjusted according to the size of the optical lens 33, so that the pressing wheel 511 can be more closely fitted with the side wall of the optical lens 33, thereby facilitating the automatic centering of the optical lens 33; when the optical lens 33 is relatively stable, the fixing bolt 510 is screwed to fix the support rod 59 to the first rotating rod 55 and the second rotating rod 56;

[0055] Step 2: When the control system controls the automatic alignment adjustment of the grinding disc 9 and the optical lens 33 through the adjustment mechanism 6, the straight-line distance between the grinding disc 9 and the optical lens 33 is measured by the ultrasonic rangefinder, and input into the control module for data analysis and processing. The control module issues an instruction to control the drive module to adjust the movement position of the grinding disc 9, and at the same time issues the next measurement instruction to the measurement module. The drive module adjusts in three-dimensional space according to the control instruction until the grinding disc 9 and the optical lens 33 are fully automatically aligned. The feedback module feeds back the movement information of the grinding disc 9 in three-dimensional space to the control module;

[0056] Step three, when the adjusting mechanism 6 is adjusted, the first motor 16 rotates to drive the first rotating shaft 17 to rotate, and the first rotating shaft 17 drives the first screw rod 20 and the second screw rod 24 to rotate synchronously through the bevel gear, and the first screw rod 20 and the second screw rod 24 synchronously drive the adjusting block 15 to move axially along the first screw rod 20, when the adjusting block 15 moves close to the first rotating shaft 17, the third elastic member 13 is compressed, and the fourth elastic member 14 is extended, and when the adjusting block 15 moves away from the first rotating shaft 17, the states of the third elastic member 13 and the fourth elastic member 14 are opposite to the above process; the second motor 25 rotates to drive the first screw rod 20 and the second screw rod 24 to drive the adjusting block 15 to move axially along the first screw rod 20, and when the adjusting block 15 moves close to the first rotating shaft 17, the third elastic member 13 and the fourth elastic member 14 are opposite to the above process; The second rotating shaft 26 is driven to rotate, and the second rotating shaft 26 drives the third screw rod 31 and the fourth screw rod 32 to rotate synchronously through the bevel gear. The third screw rod 31 and the fourth screw rod 32 synchronously drive the adjusting block 15 to move axially along the third screw rod 31. When the adjusting block 15 moves close to the second rotating shaft 26, the second elastic member 12 is compressed and the first elastic member 11 is extended. When the adjusting block 15 moves away from the second rotating shaft 26, the states of the first elastic member 11 and the second elastic member 12 are opposite to the above process. The distance that the grinding disc 9 moves in the direction perpendicular to the optical lens 33 is directly measured by the data of the linear motor 7.

[0057] In the above step 1, in order to improve the accuracy of the automatic centering of the center of the optical lens 33 of different sizes, so as to better facilitate the identification and positioning of the grinding plate 9 and its center, the center of the optical lens 33 is r1, the center of the fixing ring 51 is r2, and in the process of fixing the optical lens 33, the angle between the first rotating rod 55 and the second rotating rod 56 is θ 1 The telescopic rod 53 is extended by a distance d, and the lengths of the first rotating rod 55 and the second rotating rod 56 are both L1; the efficiency of automatic alignment is improved, and the angles r1 and r2 and the first rotating rod 55 and the second rotating rod 56 are θ 1 The relationship between satisfies: r2-r1=d+cos(θ 1 / 2)L1.

[0058] The device obtained by the above technical solution is an automatic alignment jig and positioning method for a polishing sheet. Through the provided clamping mechanism and centering mechanism, the optical lens can be automatically centered and clamped, which is convenient for the subsequent polishing process, reduces polishing errors, improves polishing accuracy, and improves the fixation of the optical lens. The automatic alignment jig and positioning method for a polishing sheet of the present invention can automatically align the optical lens by controlling the motor through the provided adjustment mechanism, grind different arcs at different positions of the optical lens, improve the polishing efficiency of the optical lens, and reduce the probability of producing defective products. By limiting the standard distance between the polishing sheet and the optical lens to A, and the relationship between the two actual measured distances A1 and A2, the accuracy of the alignment between the polishing sheet and the optical lens can be improved according to the size of different optical lenses. By limiting the angles between r1 and r2 and the first rotating rod and the second rotating rod to θ 1 The relationship between them can improve the accuracy of automatic centering of the center of optical lenses of different sizes, thereby making it easier to identify and locate the grinding disc and its center, thereby improving accuracy.

[0059] Other technical solutions not elaborated in detail in the present invention are all existing technologies in the field and will not be described in detail here.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic alignment fixture for a polishing disc, It is characterized in that The invention comprises a shell (1), a base (2) is provided below the shell (1), a fixing block (543) is provided near one end of the shell (1), the fixed end is connected to a connecting rod (4), the other end of the connecting rod (4) is connected to a clamping mechanism (5), the clamping mechanism (5) comprises a fixing ring (51), the fixing ring (51) is connected to the connecting rod (4), a plurality of centering mechanisms (52) are provided on the fixing ring (51), the centering mechanisms (52) are arranged through the side wall of the fixing ring (51), and the plurality of centering mechanisms (52) clamp the optical lens (33) together; during the clamping process, the clamping mechanism (5) realizes automatic centering and positioning of the optical lens (33); An adjusting mechanism (6) is provided on a side of the shell (1) away from the fixed block (543), the adjusting mechanism (6) being connected to the inner wall of the shell (1), the adjusting mechanism (6) comprising a box body (34), the box body (34) being a rectangular parallelepiped structure, a hollow cavity being provided at the center of the box body (34), through grooves (10) being provided on the side walls of the hollow cavity of the box body (34), a plurality of telescopic members being provided in the through grooves (10), the telescopic members being capable of forming a sliding connection with the through grooves (10), one end of the plurality of telescopic members extending into the box body (34) and being connected to a driving mechanism, the other ends of the plurality of telescopic members being connected to an adjusting block (15), the adjusting block (15) being capable of moving inside the hollow cavity; A first motor (16) is provided on the outer side of the box body (34) near a corner, the output shaft of the first motor (16) is connected to a first rotating shaft (17), an end of the first rotating shaft (17) near the first motor (16) is provided with a first bevel gear (18), the first bevel gear (18) is meshingly connected to a second bevel gear (19), the second bevel gear (19) is connected to a first screw rod (20), the other end of the first screw rod (20) is rotatably connected to the inner wall of the box body (34) via a bearing; a moving block (21) is provided on the first screw rod (20), an internal threaded hole is provided at the center of the moving block (21), the moving block (21) is rotatably connected to the first screw rod (20) via the internal threaded hole, and the outer wall of the moving block (21) is connected to the sliding rod (111) of the first elastic member (11); A linear motor (7) is connected to one side of the moving block (21) close to the clamping mechanism (5); a servo motor (8) is provided at the other end of the linear motor (7); an output shaft of the servo motor (8) is connected to a grinding disc (9); and the adjustment mechanism (6) adjusts the grinding disc (9) to align with the optical lens (33).

2. An automatic alignment jig for a polishing sheet according to claim 1, It is characterized in that The fixing ring (51) is provided with three sets of centering mechanisms (52) in total. The three sets of centering mechanisms (52) are arranged at an angle of 120 degrees to each other. The centering mechanisms (52) include a telescopic rod (53). The telescopic rod (53) passes through the fixing ring (51). The telescopic rod (53) and the fixing ring (51) are connected in a gap sliding manner. One end of the telescopic rod (53) is connected to a telescopic cylinder (512). The telescopic cylinder (512) is arranged outside the fixing ring (51). The telescopic cylinder (512) is fixedly connected to the fixing ring (51). The other end of the telescopic rod (53) is connected to a fixing block (543). The fixing block (543) is symmetrically provided with a first rotating rod (55) and a second rotating rod (56) at positions near both ends. The ends of the first rotating rod (55) and the second rotating rod (56) are both connected to a pressing wheel (511). The surface of the pressing wheel (511) is provided with a rubber layer.

3. An automatic alignment jig for a polishing sheet according to claim 2, It is characterized in that The first rotating rod (55) is provided with a first sliding groove (57), the second rotating rod (56) is provided with a second sliding groove (58), a support rod (59) is provided between the first rotating rod (55) and the second rotating rod (56), both ends of the support rod (59) are connected with fixing bolts (510), the support rod (59) can be slidably connected with the first sliding groove (57) and the second sliding groove (58) through the fixing bolts (510), and the support rod (59) can be fixed to the first rotating rod (55) and the second rotating rod (56) through the fixing bolts (510).

4. The automatic alignment jig for a polishing sheet according to claim 1, It is characterized in that There are four groups of telescopic parts in the through groove (10), and the four telescopic parts are respectively located around the hollow cavity; the four telescopic parts are respectively a first elastic part (11), a second elastic part (12), a third elastic part (13), and a fourth elastic part (14); the first elastic part (11) and the second elastic part (12) are arranged in a central symmetric manner, and the third elastic part (13) and the fourth elastic part (14) are arranged in a central symmetric manner.

5. An automatic alignment jig for a polishing sheet according to claim 4, It is characterized in that The telescopic member comprises a sliding rod (111), wherein the sliding rod (111) is arranged in a through groove (10), the sliding rod (111) and the through groove (10) are slidably connected, one end of the sliding rod (111) is connected to a driving mechanism, the other end of the sliding rod (111) is connected to a sleeve (112), the other end of the sleeve (112) is provided with a guide rod (113), the guide rod (113) is slidably connected to the sleeve (112), the other end of the guide rod (113) is connected to an adjustment block (15), the guide rod (113) and an outer side wall of the sleeve (112) are provided with a spring (114), one end of the spring (114) is connected to the sliding rod (111), and the other end of the spring (114) is connected to the guide rod (113).

6. An automatic alignment jig for a polishing sheet according to claim 5, It is characterized in that A third bevel gear (22) is provided on the end of the first rotating shaft (17) away from the first motor (16); the third bevel gear (22) is meshingly connected with a fourth bevel gear (23); the fourth bevel gear (23) is connected with a second screw rod (24); the other end of the second screw rod (24) is rotatably connected to the inner wall of the box body (34) via a bearing; the first screw rod (20) and the second screw rod (24) are arranged corresponding to each other; the moving block (21) on the second screw rod (24) is matched and rotatably connected to the second screw rod (24); the outer wall of the moving block (21) on the second screw rod (24) is connected to the sliding rod (111) of the second elastic member (12).

7. An automatic alignment jig for a polishing sheet according to claim 6, It is characterized in that A second motor (25) is provided at a diagonal position of the first motor (16); an output shaft of the second motor (25) is connected to a second rotating shaft (26); an end of the second rotating shaft (26) close to the second motor (25) is provided with a fifth bevel gear (27); the fifth bevel gear (27) is meshingly connected to a sixth bevel gear (28); the sixth bevel gear (28) is connected to a third screw rod (31); the other end of the third screw rod (31) is rotatably connected to an inner side wall of a box body (34) via a bearing; a moving block (21) on the third screw rod (31) is rotatably connected to the third screw rod (31); and an outer side wall of the moving block (21) on the third screw rod (31) is connected to a sliding rod (111) of a third elastic member (13).

8. An automatic alignment jig for a polishing sheet according to claim 7, It is characterized in that A seventh bevel gear (29) is provided at one end of the second rotating shaft (26) away from the second motor (25); the seventh bevel gear (29) is meshingly connected to an eighth bevel gear (30); the eighth bevel gear (30) is connected to a fourth screw rod (32); the other end of the fourth screw rod (32) is rotatably connected to the inner wall of the box body (34) via a bearing; the moving block (21) on the fourth screw rod (32) is rotatably connected to the fourth screw rod (32); and the outer wall of the moving block (21) on the fourth screw rod (32) is connected to the sliding rod (111) of the fourth elastic member (14).

9. The automatic alignment jig for a polishing sheet according to claim 4, It is characterized in that The first elastic member (11) and the second elastic member (12) are located in the same plane, the third elastic member (13) and the fourth elastic member (14) are arranged to be offset from the first elastic member (11) and the second elastic member (12), and the third elastic member (13) and the fourth elastic member (14) are located in different planes from the first elastic member (11) and the second elastic member (12).

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