A composite centering edge grinding machine

Abstract

The present invention relates to a composite centering and edge grinding machine. The device combines a new centering technology of mechanical centering principle and optical centering principle. The device can monitor the size of the lens center's jump in real time through a display on the mechanical centering and edge grinding machine, and grind the outer circle after adjusting the size of the center's jump to an allowable range, thereby expanding the processing range of the mechanical centering and edge grinding machine, so that lenses with poor centering coefficients can still be processed on the mechanical centering and edge grinding machine. The device includes a traditional mechanical centering and edge grinding machine, a compact reflective eccentric and a connecting part. The eccentric can adjust its horizontal and vertical positions, thereby adjusting the distance from the reflective prism to the lens, and aligning the optical axis of the eccentric with the machine tool spindle. The reflective centering and edge grinding machine greatly increases the accuracy and processing range of the mechanical centering and edge grinding machine, and has strong operability and low cost, effectively saves resources, reduces enterprise costs, and is suitable for promotion and application.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical centering and edge grinding of optical lenses, and in particular to a composite centering and edge grinding machine. Background Art

[0002] Optical lenses are key components of various optical imaging systems. The quality of optical lenses directly affects the performance of the imaging system and even determines its success. Since optical lenses must have various aberration defects in theory, a more complex combination of optical lenses of different shapes and materials is often used in the design of optical lenses. The purpose is to correct the various aberrations of the optical lenses in order to obtain high-quality imaging quality. However, there are still many errors from the completion of the design to the actual manufacturing. In the actual manufacturing process of optical lenses, it is inevitable that there will be various parts manufacturing errors, lens adjustment errors, etc. Although the parts of the optical lens, lens barrel, spacer, etc. that affect the optical imaging quality generally have higher tolerance requirements, even so, these residual tolerances will still affect the imaging quality of the entire lens.

[0003] The quality requirements of modern optical systems are getting higher and higher. For some special high-precision applications, the degradation of optical system quality caused by a lens eccentricity of several microns is intolerable. Therefore, the precise control and adjustment process of lens eccentricity has become a bottleneck in optical lens manufacturing technology.

[0004] As one of the most important edge grinding processes, mechanical centering is to place the lens to be centered between a pair of coaxial chucks with high precision and end faces precisely perpendicular to the axis, and use spring pressure to achieve centering. The entire surface of the lens is in contact with the end face of the joint. At this time, the spherical centers of the two surfaces of the lens are located on the axis of the joint, so that the lens is clamped and the purpose of centering is achieved at the same time. This centering method has high processing dimensional accuracy, high efficiency, and convenient operation. Both the outer circle of the lens and the end face platform size can be accurately controlled, but the centering accuracy is greatly affected by the centering coefficient or the centering angle. The larger the centering coefficient or the centering angle, the higher the centering accuracy, and vice versa. If the mechanical centering method is used, the centering coefficient or the centering angle must be calculated before centering to determine whether this centering method can be used.

[0005] like Fig. 9 As shown, the centering condition of the lens is that the centering force P must be greater than the friction force F. If the curvature radius of the lens R1 = R2 = R, the total centering angle is Indicates that, and the friction coefficient between the glass and the chuck is μ, when the centering condition is met:

[0006]

[0007] and

[0008] Where: R——radius of curvature of the lens

[0009] D'——chuck diameter

[0010] This formula represents the condition of mechanical centration when the radius of curvature of the two surfaces of the lens is the same. When R1≠R2, then Then the centering condition of the lens should satisfy Biconvex and biconcave lenses are marked with a "+" sign, and meniscus lenses are marked with a "-" sign. Use the centering coefficient Z instead of μ. In addition, for single-sided centering and Very small, then available and replace and so Generally, the friction coefficient between the glass lens and the chuck is μ=0.15, so 1) when Z>0.15, it is equivalent to The centering condition is good; 2) When Z = 0.10 ~ 0.15, 30', the centering condition is poor; 3) When Z<0.15, It cannot be centered at all. If the center deviation of the lens is required to be high, it is better to choose a centering angle > 20°. Therefore, the mechanical centering edge grinding machine is only suitable for lens structures with a large centering coefficient, while the centering accuracy is poor for lenses with a small centering coefficient. Summary of the invention

[0011] In view of the above-mentioned problems, the present invention aims to provide a centering and edging grinding device with low cost, strong operability, high precision and wide application range.

[0012] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a composite centering and edge grinding machine, the mechanical centering and edge grinding machine has a symmetrical main shaft that can clamp the lens, a grinding wheel corresponding to the lens in the clamped state and used for grinding the side of the lens is provided on one side of the main shaft, and a reflective optical system for centering and clamping the lens is provided on the other side of the main shaft corresponding to the grinding wheel.

[0013] Preferably, the reflective optical system includes a reflective eccentric meter, a connecting tube, a spectroscopic system and a photographic system connected in sequence, an object system is provided on one side of the spectroscopic system, the reflective eccentric meter is perpendicular to the main axis, and the connecting tube, the spectroscopic system and the photographic system are parallel to the main axis.

[0014] Preferably, a fixing rod is provided on the bed of the mechanical centering edge grinding machine, a fixing plate is provided on the fixing rod which can be adjusted up and down, the light splitting system is horizontally slidably connected to the fixing plate and simultaneously supports the reflective optical system as a whole.

[0015] Preferably, the connection end between the reflective eccentric meter and the connecting tube is provided with a swing mechanism for rotating the reflective eccentric meter about the axis of the connecting tube and making the end of the reflective eccentric meter separate from or approach the main shaft.

[0016] Preferably, the reflective eccentric meter includes a reflective prism, a focus-adjustable objective lens, a collimator objective lens and a 90° optical path turning prism in sequence along the direction from the main axis to the swing mechanism.

[0017] Preferably, a displacement groove is provided on the barrel wall of the reflective eccentric meter corresponding to the adjustable focus objective lens along its length direction, and a displacement screw connected to the adjustable focus objective lens is passed through the displacement groove.

[0018] Preferably, the photographic system includes a CCD and a display, and the object system includes a graticule and an illumination system.

[0019] Preferably, a balancing mechanism for balancing the grinding force of the grinding wheel is provided on the other side of the main shaft and corresponding to the grinding wheel.

[0020] Preferably, the balancing mechanism comprises a balancing wheel corresponding to the grinding wheel and capable of being closely attached to the side of the lens, and the contact pressure between the balancing wheel and the lens is always equal to the grinding pressure of the grinding wheel.

[0021] The beneficial effects of the present invention are as follows: the reflective eccentric meter is provided with a reflective prism system, which can reflect the vertex image and the spherical center image of the lens, fold the optical path, and make it possible to install the eccentric meter without modifying the mechanical edge grinding machine tool; the reflective prism system can also rotate around the optical axis of the eccentric meter, thereby adjusting the position of the spherical reflection image of the lens.

[0022] The focusing of the reflective eccentric is just the movement of the objective lens along the eccentric, which greatly saves space, simplifies the structure and improves operability. At the same time, the optical transmission path composed of multiple reflective prisms greatly shortens the overall length of the optical path and reduces the space occupied by the edge grinder.

[0023] After the reflective eccentric meter is reflected by the lens and centered on the lens, the reflective eccentric meter is completely separated from the contact between the main shaft and the lens through a swing mechanism, thereby solving the interference effect on the edge grinding process.

[0024] For lenses with different thicknesses and sagittal heights, it is necessary to move the overall eccentric to allow a certain space between the lens and the reflective prism. Therefore, the reflective eccentric can move along the positioning plate and the positioning rod, and the range covers the entire spindle clamping space. Therefore, the reflective centering edge grinding machine greatly increases the accuracy and processing range of the mechanical centering edge grinding machine, and has strong operability and low cost, effectively saving resources, reducing enterprise costs, and is suitable for promotion and application.

[0025] After adding a reflective optical system to the mechanical centering edge grinding machine, the eccentric image can be intuitively seen for adjustment to solve the above-mentioned problem. The eccentricity accuracy is not affected by the centering coefficient, and the edge grinding of products with smaller edge thickness differences can be achieved, with higher yield and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the reflective mechanical centering edge grinding machine of the present invention.

[0027] Figure 2 For the present invention Figure 1 Section view.

[0028] Figure 3 It is a schematic diagram of the flipping of the reflective eccentricity meter of the present invention.

[0029] Figure 4 It is a schematic diagram of the overall structure of the spindle, grinding wheel and balancing mechanism of the present invention (unground state).

[0030] Figure 5 For the present invention Figure 4 Schematic diagram of the grinding equilibrium state of the structure.

[0031] Figure 6 It is an overall schematic diagram of the balance wheel structure of the present invention.

[0032] Figure 7 It is an enlarged schematic diagram of the balance wheel structure of the present invention.

[0033] Figure 8 It is a partial schematic diagram of the contact between the lens and the balance wheel of the present invention.

[0034] Fig. 9 Schematic diagram of centering of lens in prior art.

[0035] Among them: 1-reflective eccentric meter; 11-displacement slot; 101-swing mechanism; 1011-reflective prism seat; 1012-adjustable focus objective lens; 1013-collimator objective lens; 1014-90 degree optical path turning prism; 102-connecting tube; 103-object system; 1031-graticule; 1032-illumination system; 104-spectrometric system; 105-photographic system; 1051-CCD; 1052-display; 2-fixed plate; 21-slideway; 3-fixed rod; 4-mechanical centering edge grinder; 402-first spindle; 403-second spindle; 5-reflective prism; 6-grinding wheel; 7-balance wheel; 71-groove; 71a-bottom surface; 71b-side wall; 8-support frame; 9-fixed bracket; 10-lens to be processed; 20-displacement screw; 30-servo motor; 40-screw. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0037] See attached Figure 1-9 A composite centering and edge grinding machine is shown, wherein the mechanical centering and edge grinding machine 4 has a symmetrical main shaft that can clamp the lens. Specifically, the main shaft includes a first main shaft (shown in 402 in the figure) that provides rotational drive and a second main shaft (shown in 402 in the figure) that clamps the lens, and a vacuum adsorption device (including a rotary air valve and an adsorption plate for adsorbing the lens, not shown in the figure) is provided at the end of the first main shaft. The lens is adsorbed on the first main shaft 402 by the vacuum adsorption device, and is pressed against the other side of the lens by the second main shaft 403, and the lens is driven to rotate by the first main shaft 402. A grinding wheel (shown in 6 in the figure) corresponding to the lens in the clamping state and used for grinding the side edge of the lens is provided on one side of the main shaft. In the above-mentioned state where the lens is pressed against and rotated by the first main shaft and the second main shaft, the side edge of the lens is ground by the grinding wheel. In the edge grinding operation, the air pump adsorption device can effectively perform a strong adsorption and tightening effect on the lens with a spherical shape, so that the lens has the advantages of strong firmness and good stability after centering, positioning and clamping. It has a great auxiliary effect on the accuracy of precise centering and edge grinding of the lens, and helps to improve the grinding quality of the lens.

[0038] In order to improve the molding accuracy after grinding during the above-mentioned grinding operation, it is necessary to perform precise centering and clamping operations on the initial state of the lens before grinding, and a reflective optical system for lens centering and clamping is provided on the other side of the spindle corresponding to the grinding wheel. The reflective optical system uses the accuracy of the light source propagation path to provide precise centering reference assistance for the centering and clamping of the lens, so as to improve the accuracy of the lens centering and clamping, and ultimately improve the grinding and molding quality of the lens.

[0039] Specifically, the reflective optical system includes a reflective eccentric 1, a connecting tube 102, a spectroscopic system 104 and a photographic system 105 connected in sequence, an object system 103 is provided on one side of the spectroscopic system 104, the reflective eccentric 1 is perpendicular to the main axis, and the connecting tube 102, the spectroscopic system 104 and the photographic system 105 are parallel to the main axis. The reflective eccentric 1 and the connecting tube 102, the spectroscopic system 104 and the photographic system 105 form a right-angle structure as a whole, so that the centering light source forms a right-angle reflection path and has a right-angle reflection loop. Compared with the direct reflection loop, the complexity of the light source path is increased, which can effectively increase the difficulty of the path loop and further improve the accuracy of the light source reflection loop (the complexity of the light source path can improve the accuracy of the light source reflection adjustment and centering). At the same time, because the reflective optical system is located on one side of the main axis as a whole, the entire eccentric is attached to the edge grinding machine as a whole, does not occupy the operating space, thereby reducing its influence on the lens clamping and center adjustment, and reducing the problem of error accumulation in the lens edge grinding operation.

[0040] Specifically, a fixing rod 3 is provided on the bed of the mechanical centering edge grinding machine 4, and a fixing plate 2 is provided on the fixing rod 3 which can be adjusted up and down. The light splitting system 104 is horizontally slidably connected to the fixing plate 2 and supports the reflective optical system as a whole. Preferably, a slide groove (not shown in the figure) is provided on the fixing rod 3 for the fixing plate 2 to slide up and down, and a tightening screw (not shown in the figure) is penetrated on one side of the slide groove, and the position of the fixing plate 2 to be adjusted up and down is limited by tightening the fixing plate 2 with the tightening screw. Similarly, a slide groove 21 is provided on the fixing plate 2, and the light splitting system slides horizontally along the slide groove, and a tightening bolt (not shown in the figure) is also penetrated on the slide groove at this location to limit the horizontal adjustment position of the light splitting system. Therefore, through the adjustment in the above two directions, the overall position adjustment of the reflective optical system is realized, and finally the adjustment function of the relative position of the end of the reflective eccentric 1 and the main shaft and the lens is realized, and the optical axis of the reflective eccentric 1 is aligned with the main shaft 402 of the machine tool.

[0041] In order to make the reflective eccentric 1 separate from the lens and the main shaft after completing the auxiliary function of centering and clamping the lens, and avoid interference with lens grinding, the connection end of the reflective eccentric 1 and the connecting tube 102 is provided with a swing mechanism 101 for rotating the reflective eccentric 1 around the axis of the connecting tube 102 and making the end of the reflective eccentric 1 separate from or approach the main shaft. On the basis of adjusting the horizontal and vertical positions of the reflective eccentric 1 by the above-mentioned fixing plate and fixing rod, the reflective eccentric 1 is rotated around the axis of the connecting tube 102 again by the swing mechanism 101, so that the end of the reflective eccentric 1 can contact the main shaft and the lens to complete the auxiliary centering operation. Before grinding, the reflective eccentric 1 can be separated from the main shaft and the lens by rotating the swing mechanism 101, avoiding interference with lens grinding. The preferred swing mechanism 101 is specifically that the end of the reflective eccentric 1 is rotatably connected with the end of the connecting tube 102 to realize the overall swing of the reflective eccentric 1, which is convenient for finding the reflected image of the lens.

[0042] Specifically, the interior of the reflective eccentric instrument 1 includes a reflective prism 5 (preferably a 45° prism), an adjustable focus objective lens 1012, a collimator objective lens 1013, and a 90° optical path turning prism 1014 in sequence along the direction from the main axis to the swing mechanism 101. In order to facilitate the reflective prism 5, a reflective prism seat 1011 for mounting the reflective prism 5 is also provided at the end of the reflective eccentric instrument 1. The light source received from the connecting tube 102 is refracted 90° by the 90° optical path turning prism 1014, and sequentially passes through the collimator objective lens 1013, the adjustable focus objective lens 1012, and then passes through the reflective prism 5 so that the light source is refracted again to be coaxial with the main axis and perpendicular to the lens, and the center position of the lens is imaged and detected through the reflected light source.

[0043] In order to realize the focusing function of the adjustable focus objective lens 1012, a displacement groove 11 is opened along the length direction of the reflective eccentric instrument 1 tube wall corresponding to the adjustable focus objective lens 1012, and a displacement screw 20 connected to the adjustable focus objective lens is passed through the displacement groove. The displacement screw moves along the length direction of the reflective eccentric instrument 1 tube wall, thereby realizing the focusing function.

[0044] Specifically, the photographic system 105 includes a CCD 1051 and a display 1052. Preferably, the component connecting the photographic system 105 and the optical splitter system 104 is a CCD connecting ring, and a gap is left between the CCD connecting ring and the optical splitter system 104. The photographic system 105 is preferably fixed to the optical splitter system 104 by four set screws (not shown in the figure), and the position of the CCD 1051 to the optical splitter system 104 can be adjusted by the set screws, thereby adjusting the position of the screen cross image.

[0045] Specifically, the object system includes a graticule 1031 and an illumination system 1032. Preferably, the illumination system 1032 includes an LED light source with adjustable brightness, an LED lens, and a heat sink to provide uniform and sufficiently bright illumination for the graticule 1031. Since the LED light source has the function of adjustable brightness, the aperture of each reflective prism can be reduced on the basis of this function, thereby reducing the size of the reflective prism seat 1011, and reserving operating space for the eccentric adjustment of the lens. When the aperture of the reflective prism is reduced, the brightness of the reflected light is very small, so the adjustable LED light source provides uniform and sufficiently bright illumination as required.

[0046] Preferably, the light splitting system includes a lens barrel, in which are arranged 45° reflective prisms symmetrically spliced ​​into a square structure, which refract the LED light source and project it along the connecting tube 102, and refract it into the reflective eccentric 1 through the 90° optical path turning prism 1014, and refract it again through the reflective prism 5 to be coaxial with the main axis and perpendicular to the grinding lens.

[0047] After adjusting the center of the lens, the lens 10 is adsorbed and fastened by the air pump adsorption device on the first spindle 402, and then the second spindle 403 is used to clamp and fasten the lens together with the first spindle 402 on the other side of the lens, so that the lens does not deflect when it is subjected to the grinding force of the grinding wheel 6 and maintains the edge grinding accuracy. However, in this state, the lens is subjected to the external force on one side of the grinding wheel 6, and in order to prevent the grinding external force from causing displacement of the clamping state of the lens, it is necessary to increase the clamping force of the first spindle 402 and the second spindle 403 to overcome the grinding external force on one side of the grinding wheel 6. In this state, the clamping force of the first spindle 402 and the second spindle 403 on the lens will be too large, which may easily cause the problem of clamping the lens surface or causing the lens to break. At the same time, the unilateral grinding external force will cause the lens to have a relative sliding problem between the first spindle 402 and the second spindle 403, and then there will be a scratch problem. Therefore, in order to solve this problem, a balancing mechanism for balancing the grinding force of the grinding wheel 6 is provided on the other side of the spindle and at a position corresponding to the grinding wheel 6. The balancing mechanism can effectively balance the unilateral grinding pressure of the grinding wheel 6 on the lens when grinding the lens, thereby reducing the clamping force of the first spindle 402 and the second spindle 403 on the lens, thereby avoiding the problem of lens breakage caused by excessive clamping force. At the same time, the balancing of the grinding force can avoid the problem of scratches on the lens surface caused by the relative sliding of the lens relative to the first spindle 402 and the second spindle 403.

[0048] Specifically, Figure 4-5As shown, the balancing mechanism includes a balancing wheel 7 corresponding to the grinding wheel 6 and capable of being tightly attached to the side of the lens, and the contact pressure between the balancing wheel 7 and the lens is always equal to the grinding pressure of the grinding wheel 6. Preferably, a groove 71 is provided on the balancing wheel 7 to match the contact with the side of the lens, and the groove 71 has a bottom surface 71a in contact with the side of the lens, and side walls 71b in contact with both side surfaces of the lens. Through the contact between the side of the lens and the bottom surface 71a of the groove 71, a balancing external force is provided to the lens to overcome the grinding wheel 6. While the lens is being ground, the balancing wheel 7 rotates with the lens. In order to reduce the contact friction between the balancing wheel 7 and the lens, preferably, the two side walls 71b of the groove 71 are set to an oblique structure (the overall groove 71 is a conical open structure) to avoid contact with the lens surface (such as Figure 8 As shown in FIG. 1 , only the bottom surface 71a of the groove 71 is left in contact with the side of the lens to provide a balanced external force. Preferably, the bottom width of the groove 71 is equal to the side width of the lens to prevent the lens from sliding laterally in the groove 71.

[0049] The contact pressure between the balance wheel 7 and the lens is always equal to the grinding pressure of the grinding wheel 6. Its function is: as the grinding depth increases, the grinding wheel 6 will gradually move toward the axis of the lens to grind the lens of the rated outer diameter. During the movement of the grinding wheel 6, there will be a change in the grinding force. In order to avoid the problem of imbalance between the balance force provided by the balance wheel 7 and the change in external force, the contact pressure between the balance wheel 7 and the lens is always equal to the grinding pressure of the grinding wheel, so that the grinding force and the balance force on both sides of the lens are always balanced, and the clamping position of the lens will not be affected. In order to achieve the effect that the contact pressure between the balance wheel 7 and the lens is always equal to the grinding pressure of the grinding wheel 6, the preferred specific structure includes a support frame 8 provided on one side of the balance wheel 7, a fixed support frame 9 is fixedly provided on one side of the support frame 8, and the support frame 8 is slidably provided on the fixed support frame 9 toward the lens, and a servo motor 30 and a screw 40 that controls the sliding of the support frame 8 by the servo motor 30 are provided on the fixed support frame 9. Pressure sensors and control devices are provided on the balancing wheel 7 and the grinding wheel 6 (neither of them is shown in the figure). The principle of the above structure is: the pressure sensors on the balancing wheel 7 and the grinding wheel 6 respectively detect the pressure of the two on the lens body. When the pressure of the grinding wheel 6 is too large or too small, it is fed back to the control device through the pressure sensor and compared with the value of the pressure sensor on the balancing wheel 7. Then, by controlling the servo motor 30 and the screw rod 40, the balancing wheel 7 is driven to approach or move away from the lens to achieve a constant balance between the grinding external force and the balancing force, thereby avoiding the problem of the lens being broken after the first spindle 402 and the second spindle 403 have too large a holding force, and the lens surface being scratched due to the imbalance of the grinding external force, and effectively ensuring the processing quality of the lens with high quality requirements during edge grinding, and further improving it.

[0050] The principle of the present invention is as follows: a lens to be edged is fixed on the first spindle of a machine tool by vacuum adsorption, an eccentric is rotated by a swing mechanism to make the optical axis of a reflective prism coincide with the spindle of the machine tool, an objective lens is moved by a displacement screw to make the eccentric focus on the vertex of the lens surface, a clear cross image appears on the screen at this time, the position reading of the objective lens at this time is recorded, the objective lens is moved again by a distance of a surface radius, a cross image of the spherical center of the surface is found, the spindle of the machine tool is rotated, the cross image on the display rotates with the rotation of the spindle of the machine tool, the suction force is reduced according to the rotation track circle of the cross image, the lens is manually swung to make the cross image move toward the center of the track circle until the cross image does not jump when the spindle of the machine tool is rotated, at this time the rotatable part of the eccentric is turned out of the working area of ​​the machine tool, the other side of the lens is sucked and fixed by an air pump device on the second spindle, a protective cover is covered, and the edge grinding process is carried out.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A composite centering edge grinding machine, comprising a mechanical centering edge grinding machine, wherein the mechanical centering edge grinding machine has a symmetrical main shaft capable of clamping a lens, a grinding wheel corresponding to the lens in a clamped state and used for grinding the side edge of the lens is provided on one side of the main shaft, and a reflective optical system for centering and clamping the lens is provided on the other side of the main shaft corresponding to the grinding wheel; The reflective optical system comprises a reflective eccentric, a connecting tube, a spectroscopic system and a photographic system connected in sequence, an object system is provided on one side of the spectroscopic system, the reflective eccentric is perpendicular to the main axis, and the connecting tube, the spectroscopic system and the photographic system are parallel to the main axis; The connection end between the reflective eccentric meter and the connecting tube is provided with a swing mechanism for rotating the reflective eccentric meter about the axis of the connecting tube and making the end of the reflective eccentric meter separate from or approach the main shaft; The interior of the reflective eccentric instrument includes a reflective prism, a focus-adjustable objective lens, a collimator objective lens and a 90° optical path turning prism in sequence along the direction from the main axis to the swing mechanism; The photographic system includes a CCD and a display, and the object system includes a reticle and an illumination system; A balancing mechanism for balancing the grinding force of the grinding wheel is provided on the other side of the spindle and at a position corresponding to the grinding wheel; The balancing mechanism comprises a balancing wheel corresponding to the grinding wheel and capable of being closely attached to the side of the lens, and the contact pressure between the balancing wheel and the lens is always equal to the grinding pressure of the grinding wheel; The balance wheel is provided with a groove for contacting the side edge of the lens, wherein the groove has a bottom surface for contacting the side edge of the lens and side walls for contacting the two side surfaces of the lens; the two side walls of the groove are arranged as an oblique structure; the bottom width of the groove is equal to the side width of the lens; A support frame is arranged on one side of the balance wheel, a fixed frame is fixedly arranged on one side of the support frame, and the support frame is slidably arranged on the fixed frame toward the lens direction, a servo motor and a screw rod for controlling the sliding of the support frame by the servo motor are arranged on the fixed frame, and pressure sensors and control devices are arranged on both the balance wheel and the grinding wheel.

2. A composite centering edge grinding machine according to claim 1, characterized in that: A fixing rod is arranged on the bed of the mechanical centering edge grinding machine, and a fixing plate is arranged on the fixing rod which can be adjusted up and down. The light splitting system is horizontally slidably connected to the fixing plate and supports the reflective optical system as a whole.

3. A composite centering edge grinding machine according to claim 2, characterized in that: A displacement groove is provided on the barrel wall of the reflective eccentric meter corresponding to the adjustable focus objective lens along its length direction, and a displacement screw connected to the adjustable focus objective lens is passed through the displacement groove.

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