Lens edge grinding fixture and calibration method thereof

Abstract

The present application relates to the field of lens grinding, and in particular to a lens edge grinding fixture and its calibration method. It comprises a fixed seat and a circular disc, wherein the circular disc is located above the fixed seat, and a flange is fixedly connected to the lower end of the fixed seat, and the flange is used to be fastened to the turntable via bolts; a first reference cone and a second reference cone are provided on the inner side of the fixed seat; a connecting shaft is fixedly connected to the center of the lower surface of the circular disc, and a third reference cone and a fourth reference cone are provided on the connecting shaft; the taper of the first reference cone, the taper of the second reference cone, and the taper of the third reference cone are the same; the first reference cone is in contact with the third reference cone, and the second reference cone is in contact with the fourth reference cone; the third reference cone can move in the vertical direction relative to the connecting shaft to adjust the vertical distance between the third and fourth reference cones. It can reduce the amount of wear on the mating surfaces during the switching of the grinding tools and facilitate calibration.

Description

Technical Field

[0001] The present application relates to the field of lens grinding, and in particular to a lens edge grinding fixture and a calibration method thereof. Background Art

[0002] Lenses usually need to go through processing steps such as cutting, edging, polishing, and coating. Compared with polishing, edging requires lower grinding accuracy.

[0003] In the prior art, the lens is typically fixed to a turntable, and then sandpaper is manually pressed against the corners of the lens to polish them, remove burrs from the corners, and passivate the corners to eliminate stress concentration areas at the corners. In the prior art, a positioning mold is typically used to fix the lens to the polishing station. The positioning mold is usually disc-shaped with a positioning groove in the center of the upper surface. The positioning mold is fastened to the turntable with bolts, and the lens is placed in the positioning groove. Due to the different diameters and thicknesses of different lenses, a positioning mold needs to be customized for each model of lens. Furthermore, multiple disassembly and assembly between the same positioning mold and the turntable will cause wear and extrusion deformation between the fastening mating surfaces, resulting in reduced mating accuracy and affecting polishing accuracy. Summary of the Invention

[0004] In view of this, a lens edging fixture and a calibration method thereof are proposed to reduce the wear and extrusion deformation of the mating surface during the switching of the grinding tool, and facilitate calibration to eliminate the fitting error caused by wear and deformation.

[0005] One aspect of the present application provides a lens edging fixture, comprising a fixing seat and a circular disc, wherein the circular disc is located above the fixing seat, a flange is fixedly connected to the lower end of the fixing seat, and the flange is used to be fastened to a turntable via bolts, the fixing seat is cylindrical in shape, and the central axis of the fixing seat is vertically arranged and coincides with the central axis of the turntable;

[0006] A first reference conical surface and a second reference conical surface are provided on the inner side of the fixing seat. The first reference conical surface and the second reference conical surface are spaced apart in the vertical direction. The first reference conical surface is located above the second reference conical surface. The central axes of the first reference conical surface and the second reference conical surface coincide with the central axis of the turntable.

[0007] A connecting shaft is fixedly connected to the center of the lower surface of the disk, the connecting shaft is vertically arranged and located inside the fixing seat, a third reference conical surface and a fourth reference conical surface are provided on the connecting shaft, the third reference conical surface and the fourth reference conical surface are spaced apart in the vertical direction, the third reference conical surface is located above the fourth reference conical surface, and the central axes of the third and fourth reference conical surfaces coincide with the central axis of the connecting shaft;

[0008] The taper of the first reference conical surface, the taper of the second reference conical surface, and the taper of the third reference conical surface are the same;

[0009] The first reference conical surface is in contact with the third reference conical surface, the second reference conical surface is in contact with the fourth reference conical surface, the first reference conical surface and the second reference conical surface are arranged around the connecting shaft, the ends with larger inner diameters of the first reference conical surface and the second reference conical surface are arranged upward, and the lower surface of the disc is spaced from the upper end surface of the fixing seat;

[0010] The third reference conical surface can move relative to the connecting shaft in a vertical direction to adjust the vertical distance between the third reference conical surface and the fourth reference conical surface;

[0011] A circular positioning groove is provided on the upper surface of the disc, and the central axis of the positioning groove coincides with the central axis of the connecting shaft;

[0012] The upper end surface of the fixing seat is provided with a first pin hole, the lower surface of the disc is provided with a second pin hole, and the lens edge grinding fixture also includes a pin, the lower end of the pin is inserted into the first pin hole, the upper end of the pin is inserted into the second pin hole, and the pin is vertically arranged.

[0013] In some embodiments of the above-mentioned lens edging fixture, a first counterweight positioning ring is provided on the connecting shaft, the first counterweight positioning ring is sleeved on the connecting shaft, the inner side surface of the first counterweight positioning ring is threadedly connected to the outer side surface of the connecting shaft, and the third reference cone surface is arranged on the outer side surface of the first counterweight positioning ring.

[0014] In some embodiments of the above-mentioned lens edge grinding fixture, a window is provided on the side wall of the fixing seat, and the window passes through the side wall of the fixing seat along the radial direction of the fixing seat, and the window is located between the third reference cone surface and the fourth reference cone surface. The upper surface of the first counterweight positioning ring is provided with a stop hole, and the stop hole passes through the first counterweight positioning ring in the vertical direction. The lens edge grinding fixture also includes an auxiliary stop rod, and the auxiliary stop rod is L-shaped. One end of the auxiliary stop rod is suitable for extending from the outside of the window into the inner side of the fixing seat and inserting into the stop hole from bottom to top. A reflector is fixedly connected to the lower surface of the inner side of the window, and the reflector is used to observe the light leakage under the first reference cone surface from the outside of the window.

[0015] In some embodiments of the above-mentioned lens edging fixture, a second counterweight positioning ring is provided on the connecting shaft, the second counterweight positioning ring is sleeved on the connecting shaft, the inner side surface of the second counterweight positioning ring is threadedly connected to the outer side surface of the connecting shaft, and the fourth reference cone surface is arranged on the outer side surface of the second counterweight positioning ring.

[0016] In some embodiments of the lens edging fixture described above, a diameter of the first counterweight positioning ring is greater than a diameter of the second counterweight positioning ring.

[0017] In some embodiments of the lens edging fixture, a first support and positioning ring is welded to the inner side of the fixing seat, the first support and positioning ring is arranged around the connecting shaft, and the first reference cone is arranged on the inner side of the first support and positioning ring.

[0018] In some embodiments of the above-mentioned lens edging fixture, a second support and positioning ring is welded to the inner side surface of the fixing seat, the second support and positioning ring is arranged around the connecting shaft, and the second reference cone surface is arranged on the inner side surface of the second support and positioning ring.

[0019] In some embodiments of the above-mentioned lens edging fixture, a groove is provided on the bottom surface of the positioning groove, and the groove is arranged around the center of the positioning groove. The outer ring diameter of the groove is smaller than the diameter of the positioning groove. The groove separates the bottom surface of the positioning groove into two parts, an inner and an outer part. The upper surfaces of the inner and outer parts constitute a first reference plane and a second reference plane respectively. The first reference plane and the second reference plane are located on the same plane. The side wall of the positioning groove constitutes a reference cylinder, and the reference cylinder is perpendicular to the first reference plane. An avoidance groove is provided at the intersection of the reference cylinder and the second reference plane. The cross-sectional shape of the avoidance groove is rectangular, and the angle between the opening direction of the avoidance groove and the central axis of the positioning groove is 45 degrees.

[0020] In some embodiments of the above-mentioned lens edging fixture, an air supply channel is provided in the center of the disc and the connecting shaft, and the air supply channel vertically penetrates the connecting shaft and the disc, the inner boundary of the first reference plane is formed by the top edge of the air supply channel, and the outer boundary of the first reference plane is formed by the top inner edge of the groove.

[0021] Another aspect of the present application provides a calibration method for a lens edging fixture, which is applied to the above-mentioned lens edging fixture and includes the following steps:

[0022] Rotate the first counterweight positioning ring upward to the uppermost end of the connecting shaft, rotate the second counterweight positioning ring to the lower end of the connecting shaft, and insert the connecting shaft into the fixing seat from top to bottom, so that the fourth reference conical surface contacts and fits with the second reference conical surface;

[0023] Use the auxiliary stop rod to extend into the interior of the fixing seat from the outside of the window, rotate the auxiliary stop rod so that the end of the auxiliary stop rod located inside the fixing seat is vertically facing upward, rotate the disc so that the stop through hole is located above the end of the auxiliary stop rod located inside the fixing seat, move the auxiliary stop rod so that the end of the auxiliary stop rod located inside the fixing seat is aligned with the stop through hole in the vertical direction, and move the auxiliary stop rod upward so that the end of the auxiliary stop rod located inside the fixing seat is inserted into the stop through hole;

[0024] Shine a light inward from the space between the lower surface of the disc and the upper end surface of the fixed seat, and observe the light leakage below the first reference cone through the reflector. Rotate the disc to move the first counterweight positioning ring downward relative to the connecting shaft until there is no more light leakage below the first reference cone.

[0025] Remove the auxiliary stop rod, lift the disc and the connecting shaft, insert the lower end of the pin into the first pin hole, move the disc downward and rotate it so that the upper end of the pin is inserted into the second pin hole, loosen the disc, and let the disc and the connecting shaft fall naturally under the action of gravity;

[0026] Manually rotate the turntable several times. Each time the turntable stops, observe the light leakage under the first reference cone through the reflector. If there is no light leakage under the first reference cone, it means that the calibration is completed. Otherwise, repeat the above steps.

[0027] Effects of the Invention

[0028] The first reference cone surface and the second reference cone surface, as well as the third reference cone surface and the fourth reference cone surface are arranged at intervals in the vertical direction, which can reduce the processing amount of the reference cone surface, and at the same time reduce the area of the reference surface, reduce the fitting error caused by processing error, and improve the coaxiality of the connecting shaft and the fixed seat. Once the fixed seat is installed, it does not need to be disassembled to avoid reducing the coaxiality of the fixed seat and the turntable. For lenses to be ground of different sizes, it is sufficient to replace the disc with the corresponding size of positioning groove and the connecting shaft. Each time the disc is replaced, the coaxiality between the disc and the fixed seat needs to be calibrated.

[0029] Before calibration, the second reference conical surface is in contact with the fourth reference conical surface, which can keep the connecting shaft and the fixed seat statically coaxial. Calibration until the first reference conical surface is in contact with the third reference conical surface can improve the dynamic coaxiality of the connecting shaft and the fixed seat during the grinding process, that is, keep the connecting shaft and the fixed seat dynamically coaxial.

[0030] On the one hand, the connecting shaft provides radial support for the disc so that the disc and the fixed seat remain coaxial, and at the same time generates a downward pulling force on the center of the disc. Under the centering effect of the reference cone surface, the disc can remain in a horizontal state, thereby improving the stability of the disc. During the grinding process, the disc is not prone to tilting or tipping over. Since each time the positioning groove specifications are switched, only the disc needs to be switched and the fixed seat does not need to be disassembled and reassembled, and there is no large friction between the reference cone surfaces, there is no wear or extrusion deformation between the mating surfaces, thereby reducing the amount of wear and extrusion deformation on the mating surfaces during the switching of the grinding tools, and facilitating calibration to eliminate the fitting errors caused by wear and deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

[0032] Figure 1 This is a schematic structural diagram of a lens edge grinding fixture according to an embodiment of the present application;

[0033] Figure 2 This is a schematic structural diagram of a fixing base in an embodiment of the present application;

[0034] Figure 3 This is a schematic structural diagram of the disc and the connecting shaft in an embodiment of the present application;

[0035] Figure 4 is a top view of the lens edging fixture in an embodiment of the present application;

[0036] Figure 5 It is along Figure 4 Cross-sectional view along line AA;

[0037] Figure 6 yes Figure 5 A partial enlarged view of point B in the middle;

[0038] Figure 7 is a schematic structural diagram of the lens edging fixture during calibration in an embodiment of the present application;

[0039] Figure 8 This is a schematic structural diagram of another disc in an embodiment of the present application;

[0040] Figure 9 It is a structural diagram of the connection between the fixing seat, the first supporting positioning ring and the second supporting positioning ring in an embodiment of the present application.

[0041] Description of Reference Numerals

[0042] 100. Fixing seat; 102. Disc; 104. Flange; 106. First reference cone; 108. Second reference cone; 110. Connecting shaft; 112. Third reference cone; 114. Fourth reference cone; 116. Positioning groove; 118. First pin hole; 120. Second pin hole; 122. Pin; 124. First counterweight positioning ring; 126. Window; 128. Stop hole; 130. Auxiliary stop rod; 132. Reflector; 134. Second counterweight positioning ring; 136. First support positioning ring; 138. Second support positioning ring; 140. Groove; 142. First reference plane; 144. Second reference plane; 146. Reference cylinder; 148. Avoidance groove; 150. Air supply channel; 152. Lens to be ground. DETAILED DESCRIPTION

[0043] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated. The special word "exemplary" here means "used as an example, embodiment or illustrative". Any embodiment described here as "exemplary" is not necessarily interpreted as being superior or better than other embodiments. In addition, in order to better illustrate the present application, those skilled in the art will understand that numerous specific details are given in each embodiment below. The present application can also be implemented without certain specific details. In some embodiments, methods, means and elements well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0044] Combine Figures 1 to 9As shown, embodiment 1 of the present application provides a lens edging fixture, comprising a fixing seat 100 and a disc 102. The disc 102 is located above the fixing seat 100. A flange 104 is fixedly connected to the lower end of the fixing seat 100. The flange 104 is used to be fastened to a turntable (not shown) by bolts. The fixing seat 100 is cylindrical in shape, and the central axis of the fixing seat 100 is vertically arranged and coincides with the central axis of the turntable. A first reference conical surface 106 and a second reference conical surface 108 are provided on the inner side of the fixing seat 100. The first reference conical surface 106 and the second reference conical surface 108 are arranged at intervals in the vertical direction. The first reference conical surface 106 and the second reference conical surface 108 are arranged at intervals in the vertical direction. The reference conical surface 106 is located above the second reference conical surface 108, and the central axes of the first reference conical surface 106 and the second reference conical surface 108 coincide with the central axis of the turntable; a connecting shaft 110 is fixedly connected to the center position of the lower surface of the disk 102, and the connecting shaft 110 is vertically arranged and located inside the fixed seat 100, and a third reference conical surface 112 and a fourth reference conical surface 114 are provided on the connecting shaft 110, and the third reference conical surface 112 and the fourth reference conical surface 114 are arranged at intervals in the vertical direction, and the third reference conical surface 112 is located above the fourth reference conical surface 114, and the centers of the third reference conical surface 112 and the fourth reference conical surface 114 are The axis coincides with the central axis of the connecting shaft 110; the taper of the first reference conical surface 106, the taper of the second reference conical surface 108, and the taper of the third reference conical surface 112 are the same; the first reference conical surface 106 contacts and cooperates with the third reference conical surface 112, and the second reference conical surface 108 contacts and cooperates with the fourth reference conical surface 114. The first reference conical surface 106 and the second reference conical surface 108 are arranged around the connecting shaft 110, and the ends with larger inner diameters of the first reference conical surface 106 and the second reference conical surface 108 are arranged upward, and a gap is set between the lower surface of the disk 102 and the upper end surface of the fixing seat 100; The third reference cone surface 112 can move in the vertical direction relative to the connecting shaft 110 to adjust the vertical distance between the third reference cone surface 112 and the fourth reference cone surface 114; the upper surface of the disk 102 is provided with a circular positioning groove 116, and the central axis of the positioning groove 116 coincides with the central axis of the connecting shaft 110; the upper end surface of the fixing seat 100 is provided with a first pin hole 118, and the lower surface of the disk 102 is provided with a second pin hole 120. The lens edge grinding fixture also includes a pin 122, the lower end of the pin 122 is inserted into the first pin hole 118, and the upper end of the pin 122 is inserted into the second pin hole 120, and the pin 122 is vertically arranged.

[0045] The first reference cone surface 106 and the second reference cone surface 108, as well as the third reference cone surface 112 and the fourth reference cone surface 114 are spaced apart in the vertical direction, which can reduce the processing amount of the reference cone surface and the area of the reference surface, thereby reducing the matching error caused by the processing error and improving the coaxiality of the connecting shaft 110 and the fixed seat 100. The fixed seat 100 is fastened to the turntable through the flange 104 (fastened with bolts). The rotation center axis of the fixed seat 100 and the turntable is measured using a measuring tool. The coaxiality between the two is measured, and the fixed position of the fixing base 100 relative to the turntable is fine-tuned until the fixing base 100 and the turntable remain coaxial. Once the fixing base 100 is installed, it does not need to be disassembled to avoid reducing the coaxiality between the fixing base 100 and the turntable. For lenses 152 to be ground of different sizes, the disc 102 with the corresponding locating groove 116 and the connecting shaft 110 can be replaced. Each time the disc 102 is replaced, the coaxiality between the disc 102 and the fixing base 100 needs to be calibrated. The calibration method is as follows: adjust the third reference cone surface 112 to the uppermost end of the connecting shaft 110, insert the connecting shaft 110 from top to bottom into the fixing base 100, so that the fourth reference cone surface 114 contacts and mates with the second reference cone surface 108; readjust the third reference cone surface 112 so that the third reference cone surface 112 moves downward until the third reference cone surface 112 contacts and mates with the first reference cone surface 106, and the calibration is completed. Before calibration, the second reference conical surface 108 is in contact with the fourth reference conical surface 114, which can keep the connecting shaft 110 and the fixed seat 100 statically coaxial. Calibration until the first reference conical surface 106 is in contact with the third reference conical surface 112 can improve the dynamic coaxiality of the connecting shaft 110 and the fixed seat 100 during the grinding process, that is, keep the connecting shaft 110 and the fixed seat 100 dynamically coaxial. On the one hand, the connecting shaft 110 provides radial support for the disc 102 so that the disc 102 remains coaxial with the fixed seat 100, and at the same time generates a downward pulling force on the center of the disc 102. Under the centering effect of the reference cone surface, the disc 102 can remain in a horizontal state, thereby improving the stability of the disc 102. During the grinding process, the disc 102 is not prone to tilting or tipping. Preferably, the angles between the cone surfaces of the first reference cone surface 106, the second reference cone surface 108, the third reference cone surface 112, and the fourth reference cone surface 114 and the central axis are less than 30 degrees, which can provide a more stable radial support force for the connecting shaft 110. Since each time the specifications of the positioning groove 116 are switched, only the disc 102 needs to be switched, and there is no need to re-disassemble the fixing seat 100, and there is no large friction between the reference cone surfaces, there is no wear or extrusion deformation between the mating surfaces (there is only the extrusion force caused by the weight of the disc 102 and the connecting shaft 110, which is very small and will not cause extrusion deformation), thereby reducing the amount of wear and extrusion deformation on the mating surfaces during the switching of the mold, and facilitating calibration to eliminate the mating errors caused by wear and deformation.

[0046] In some exemplary embodiments, a first counterweight positioning ring 124 is provided on the connecting shaft 110, and the first counterweight positioning ring 124 is sleeved on the connecting shaft 110. The inner surface of the first counterweight positioning ring 124 is threadedly connected to the outer surface of the connecting shaft 110, and the third reference cone surface 112 is arranged on the outer surface of the first counterweight positioning ring 124.

[0047] The first counterweight positioning ring 124 increases the downward pulling force of the connecting shaft 110 on the center of the disk 102, lowers the overall center of gravity of the disk 102 and the connecting shaft 110, and improves the stability of the disk 102. The first counterweight positioning ring 124 is threadedly connected to the connecting shaft 110, which is convenient for rotating and adjusting the position of the third reference cone surface 112 along the axial direction of the connecting shaft 110, and is convenient for calibration until the first reference cone surface 106 is in contact with the third reference cone surface 112.

[0048] In some exemplary embodiments, a window 126 is provided on the side wall of the fixing seat 100, and the window 126 penetrates the side wall of the fixing seat 100 along the radial direction of the fixing seat 100, and the window 126 is located between the third reference cone surface 112 and the fourth reference cone surface 114. A stop hole 128 is provided on the upper surface of the first counterweight positioning ring 124, and the stop hole 128 penetrates the first counterweight positioning ring 124 in the vertical direction. The lens edge grinding fixture also includes an auxiliary stop rod 130, and the auxiliary stop rod 130 is L-shaped. One end of the auxiliary stop rod 130 is suitable for extending from the outside of the window 126 into the inside of the fixing seat 100 and inserting into the stop hole 128 from bottom to top. A reflector 132 is fixedly connected to the lower surface of the inner side of the window 126, and the reflector 132 is used to observe the light leakage below the first reference cone surface 106 from the outside of the window 126.

[0049] The function and working principle of the auxiliary stop rod 130 refer to Example 2.

[0050] In some exemplary embodiments, a second counterweight positioning ring 134 is provided on the connecting shaft 110, and the second counterweight positioning ring 134 is sleeved on the connecting shaft 110. The inner surface of the second counterweight positioning ring 134 is threadedly connected to the outer surface of the connecting shaft 110, and the fourth reference cone surface 114 is arranged on the outer surface of the second counterweight positioning ring 134.

[0051] The second counterweight positioning ring 134 increases the downward pulling force of the connecting shaft 110 on the center of the disc 102, lowers the overall center of gravity of the disc 102 and the connecting shaft 110, and improves the stability of the disc 102. The second counterweight positioning ring 134 is threadedly connected to the connecting shaft 110, which facilitates the disassembly and assembly of the second counterweight positioning ring 134. The first counterweight positioning ring 124 and the second counterweight positioning ring 134 are both universal parts that can be matched with each connecting shaft 110, that is, the diameter and pitch of each connecting shaft 110 are consistent. Therefore, there is no need to replace the first counterweight positioning ring 124 and the second counterweight positioning ring 134 when switching the mold, which not only reduces the cost, but also reduces the fitting error of each reference cone surface.

[0052] In some exemplary embodiments, the diameter of the first counterweight locating ring 124 is greater than the diameter of the second counterweight locating ring 134 .

[0053] The larger the diameter and area of the reference cone surface, the greater the processing error and the greater the fitting error. By reducing the diameter of the second counterweight positioning ring 134, the diameter and area of the fourth reference cone surface 114 are reduced, and the fitting accuracy between the second reference cone surface 108 and the fourth reference cone surface 114 is improved. When there is no calibration, a higher static coaxiality can be maintained between the connecting shaft 110 and the fixed seat 100.

[0054] In some exemplary embodiments, a first support and positioning ring 136 is welded to the inner side of the fixing seat 100 . The first support and positioning ring 136 is disposed around the connecting shaft 110 , and the first reference cone surface 106 is disposed on the inner side of the first support and positioning ring 136 .

[0055] In some exemplary embodiments, a second support and positioning ring 138 is welded to the inner side of the fixing seat 100 . The second support and positioning ring 138 is disposed around the connecting shaft 110 , and the second reference conical surface 108 is disposed on the inner side of the second support and positioning ring 138 .

[0056] The first support positioning ring 136 and the second support positioning ring 138 are welded to the inner wall of the fixing seat 100 by an annular component, and then the annular component is cut to obtain a first support positioning ring 136 with a first reference cone surface 106 and a second support positioning ring 138 with a second reference cone surface 108. There is no need to cut the entire inner wall of the fixing seat 100, so the processing area is small and the cost is low.

[0057] In some exemplary embodiments, a groove 140 is provided on the bottom surface of the positioning groove 116, and the groove 140 is arranged around the center of the positioning groove 116. The outer ring diameter of the groove 140 is smaller than the diameter of the positioning groove 116. The groove 140 divides the bottom surface of the positioning groove 116 into two parts, an inner and outer part. The upper surfaces of the inner and outer parts respectively constitute a first reference plane 142 and a second reference plane 144. The first reference plane 142 and the second reference plane 144 are located on the same plane. The side wall of the positioning groove 116 constitutes a reference cylinder 146. The reference cylinder 146 is perpendicular to the first reference plane 142. An avoidance groove 148 is provided at the intersection of the reference cylinder 146 and the second reference plane 144. The cross-sectional shape of the avoidance groove 148 is rectangular, and the angle between the opening direction of the avoidance groove 148 and the central axis of the positioning groove 116 is 45 degrees.

[0058] Each datum cone is primarily used to horizontally position the central axis of the connecting shaft 110 and the positioning groove 116, while also providing vertical support for the disk 102. The datum planes (including the first datum plane 142 and the second datum plane 144) provide a clamping reference for the lens 152 to be ground, ensuring a higher levelness. The datum cylinder 146 positions the lens laterally, aligning its center with the central axis of the positioning groove 116. The provision of the groove 140 reduces the finishing area of the datum planes and the support area for the lens 152 to be ground, thereby lowering processing costs, minimizing fit errors caused by machining errors, and improving edge grinding accuracy. The avoidance groove 148 prevents burrs on the lower edge of the lens 152 from contacting the datum cylinder 146 or the second datum plane 144, potentially affecting positioning accuracy.

[0059] In some exemplary embodiments, a gas delivery channel 150 is provided in the center of the disc 102 and the connecting shaft 110. The gas delivery channel 150 vertically penetrates the connecting shaft 110 and the disc 102. The inner boundary of the first reference plane 142 is formed by the top edge of the gas delivery channel 150, and the outer boundary of the first reference plane 142 is formed by the top inner edge of the groove 140.

[0060] The air supply channel 150 is used for the air pump to draw air, so as to firmly suck the lens 152 to be ground into the positioning groove 116 and prevent the lens 152 from moving relative to the disc 102 during the edging process.

[0061] Embodiment 2 of the present application provides a calibration method for a lens edging fixture, which is applied to the lens edging fixture in Embodiment 1 and includes the following steps:

[0062] Rotate the first counterweight positioning ring 124 upward to the uppermost end of the connecting shaft 110, rotate the second counterweight positioning ring 134 to the lower end of the connecting shaft 110, and insert the connecting shaft 110 from top to bottom into the fixing seat 100 so that the fourth reference conical surface 114 contacts and mates with the second reference conical surface 108;

[0063] The auxiliary stop rod 130 is extended from the outside of the window 126 into the interior of the fixing base 100. The auxiliary stop rod 130 is rotated so that the end of the auxiliary stop rod 130 located inside the fixing base 100 is vertically facing upward. The disc 102 is rotated so that the stop hole 128 is located above the end of the auxiliary stop rod 130 located inside the fixing base 100. The auxiliary stop rod 130 is moved so that the end of the auxiliary stop rod 130 located inside the fixing base 100 is aligned with the stop hole 128 in the vertical direction. The auxiliary stop rod 130 is moved upward so that the end of the auxiliary stop rod 130 located inside the fixing base 100 is inserted into the stop hole 128.

[0064] Combine Figure 7 and Figure 9 As shown (the dotted line in the figure indicates the reflection path of light), light is shone inward from the space between the lower surface of the disk 102 and the upper end surface of the fixing base 100. The light leakage below the first reference cone surface 106 is observed through the reflector 132. The disk 102 is rotated to move the first counterweight positioning ring 124 downward relative to the connecting shaft 110 until light leakage below the first reference cone surface 106 stops.

[0065] Remove the auxiliary stopper rod 130, lift the disc 102 and the connecting shaft 110, insert the lower end of the pin 122 into the first pin hole 118, move the disc 102 downward and rotate it so that the upper end of the pin 122 is inserted into the second pin hole 120, release the disc 102, and allow the disc 102 and the connecting shaft 110 to naturally descend under the action of gravity;

[0066] Manually rotate the turntable several times. Each time the turntable stops, observe the light leakage below the first reference cone surface 106 through the reflective mirror 132. If there is no light leakage below the first reference cone surface 106, it means that the calibration is completed. Otherwise, repeat the above steps.

[0067] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A lens edging fixture, characterized in that: The fixing base comprises a fixed seat and a disc, wherein the disc is located above the fixed seat, a flange is fixedly connected to the lower end of the fixed seat, and the flange is used to be fastened to the turntable by bolts. The fixing base is cylindrical in shape, and the central axis of the fixing base is vertically arranged and coincides with the central axis of the turntable; A first reference conical surface and a second reference conical surface are provided on the inner side of the fixing seat. The first reference conical surface and the second reference conical surface are spaced apart in the vertical direction. The first reference conical surface is located above the second reference conical surface. The central axes of the first reference conical surface and the second reference conical surface coincide with the central axis of the turntable. A connecting shaft is fixedly connected to the center of the lower surface of the disk, the connecting shaft is vertically arranged and located inside the fixing seat, a third reference conical surface and a fourth reference conical surface are provided on the connecting shaft, the third reference conical surface and the fourth reference conical surface are spaced apart in the vertical direction, the third reference conical surface is located above the fourth reference conical surface, and the central axes of the third and fourth reference conical surfaces coincide with the central axis of the connecting shaft; The taper of the first reference conical surface, the taper of the second reference conical surface, the taper of the third reference conical surface, and the taper of the fourth reference conical surface are the same; The first reference conical surface is in contact with the third reference conical surface, the second reference conical surface is in contact with the fourth reference conical surface, the first reference conical surface and the second reference conical surface are arranged around the connecting shaft, the ends with larger inner diameters of the first reference conical surface and the second reference conical surface are arranged upward, and the lower surface of the disc is spaced from the upper end surface of the fixing seat; The third reference conical surface can move relative to the connecting shaft in a vertical direction to adjust the vertical distance between the third reference conical surface and the fourth reference conical surface; A circular positioning groove is provided on the upper surface of the disc, and the central axis of the positioning groove coincides with the central axis of the connecting shaft; The upper end surface of the fixing seat is provided with a first pin hole, the lower surface of the disc is provided with a second pin hole, the lens edge grinding fixture further comprises a pin, the lower end of the pin is inserted into the first pin hole, the upper end of the pin is inserted into the second pin hole, and the pin is vertically arranged; The connecting shaft is provided with a first counterweight positioning ring, which is sleeved on the connecting shaft. The inner side of the first counterweight positioning ring is threadedly connected to the outer side of the connecting shaft, and the third reference conical surface is provided on the outer side of the first counterweight positioning ring; A window is provided on the side wall of the fixing seat, and the window passes through the side wall of the fixing seat in the radial direction of the fixing seat, and the window is located between the third reference cone surface and the fourth reference cone surface. A stop through hole is provided on the upper surface of the first counterweight positioning ring, and the stop through hole passes through the first counterweight positioning ring in the vertical direction. The lens edge grinding fixture also includes an auxiliary stop rod, and the auxiliary stop rod is L-shaped. One end of the auxiliary stop rod is suitable for extending from the outside of the window into the inside of the fixing seat and inserting into the stop through hole from bottom to top. A reflector is fixedly connected to the lower surface of the inner side of the window, and the reflector is used to observe the light leakage under the first reference cone surface from the outside of the window.

2. The lens edge grinding fixture according to claim 1, characterized in that: A second counterweight positioning ring is provided on the connecting shaft, and the second counterweight positioning ring is sleeved on the connecting shaft. The inner side surface of the second counterweight positioning ring is threadedly connected to the outer side surface of the connecting shaft, and the fourth reference cone surface is provided on the outer side surface of the second counterweight positioning ring.

3. The lens edge grinding fixture according to claim 1 or 2, characterized in that: A first supporting and positioning ring is welded to the inner side surface of the fixing seat. The first supporting and positioning ring is arranged around the connecting shaft. The first reference conical surface is arranged on the inner side surface of the first supporting and positioning ring.

4. The lens edge grinding fixture according to claim 3, characterized in that: A second supporting and positioning ring is welded to the inner side surface of the fixing seat. The second supporting and positioning ring is arranged around the connecting shaft. The second reference conical surface is arranged on the inner side surface of the second supporting and positioning ring.

5. A calibration method for a lens edge grinding fixture, applied to the lens edge grinding fixture according to claim 2, characterized in that: The steps include: Rotate the first counterweight positioning ring upward to the uppermost end of the connecting shaft, rotate the second counterweight positioning ring to the lower end of the connecting shaft, and insert the connecting shaft into the fixing seat from top to bottom, so that the fourth reference conical surface contacts and fits with the second reference conical surface; Use the auxiliary stop rod to extend into the interior of the fixing seat from the outside of the window, rotate the auxiliary stop rod so that the end of the auxiliary stop rod located inside the fixing seat is vertically facing upward, rotate the disc so that the stop through hole is located above the end of the auxiliary stop rod located inside the fixing seat, move the auxiliary stop rod so that the end of the auxiliary stop rod located inside the fixing seat is aligned with the stop through hole in the vertical direction, and move the auxiliary stop rod upward so that the end of the auxiliary stop rod located inside the fixing seat is inserted into the stop through hole; Shine a light inward from the space between the lower surface of the disc and the upper end surface of the fixed seat, and observe the light leakage below the first reference cone through the reflector. Rotate the disc to move the first counterweight positioning ring downward relative to the connecting shaft until there is no more light leakage below the first reference cone. Remove the auxiliary stop rod, lift the disc and the connecting shaft, insert the lower end of the pin into the first pin hole, move the disc downward and rotate it so that the upper end of the pin is inserted into the second pin hole, loosen the disc, and let the disc and the connecting shaft fall naturally under the action of gravity; Manually rotate the turntable several times. Each time the turntable stops, observe the light leakage under the first reference cone through the reflector. If there is no light leakage under the first reference cone, it means that the calibration is completed. Otherwise, repeat the above steps.

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