CN216483841U - Magnetic suspension lens centering device - Google Patents

Abstract

The utility model provides a magnetic suspension type lens centering device which greatly improves the detection efficiency. Magnetic levitation formula lens centring means, lower locating platform are fixed on the workstation, top board and sleeve fixed connection, the sleeve lower extreme is provided with screw type magnet, workstation upper end is provided with screw type magnet, just screw type magnet on the sleeve with screw type magnet position on the workstation corresponds and the polarity is the same. The utility model simplifies and unifies the procedures of fixing the measured object, centering and leveling, solves the problem of short service life of the measuring needle caused by shaking of the lens in the measuring process due to low precision of the clamp and unstable placement of the lens, and ensures that the corresponding surface type result can be obtained by only detecting one lens, thereby greatly improving the detection efficiency and increasing the stability and consistency of the measuring result.

Description

Magnetic suspension lens centering device

Technical Field

The utility model relates to an auxiliary detection device for ensuring the positioning and centering of a lens in the surface type detection and measurement process of an aspheric lens product, in particular to a magnetic suspension type lens centering device.

Background

With the rapid development of products such as monitoring, automotive electronics, motion DV, laser televisions, electronic military weaponry and the like, the application of optical glass is becoming wide. Aspheric glass lenses are important because they can effectively reduce image distortion and coma aberration, improve imaging quality, improve system discrimination ability, and simplify instrument structure. Meanwhile, the performance detection technology of the optical aspheric lens is also continuously optimized and improved. Currently, there are many professional aspheric surface detection means and detection devices on the market, for example: when the Talysurf PGI optical equipment is used for surface type quality detection, many steps of equipment operation such as loading of an object to be detected, manual Y-axis center finding and the like are manually operated, and the detection auxiliary clamp has the defects of low precision, large error, low efficiency and poor consistency of detection results, and cannot meet the high-precision detection requirement of precision products.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a magnetic suspension type lens centering device which can greatly improve the detection efficiency.

The technical scheme adopted by the utility model for solving the technical problem is as follows: magnetic levitation formula lens centring means, lower locating platform are fixed on the workstation, top board and sleeve fixed connection, the sleeve lower extreme is provided with screw type magnet, workstation upper end is provided with screw type magnet, just screw type magnet on the sleeve with screw type magnet position on the workstation corresponds and the polarity is the same.

Further, the lower positioning table is fixed on the working base table through M4-50 hexagon socket head cap screws, and the M4-50 hexagon socket head cap screws penetrate through the central hole of the lower positioning table.

Furthermore, the upper end of the side wall of the sleeve is provided with U-shaped openings with different heights and widths.

Further, sleeve lower extreme 90 equipartitions are provided with four screw type magnet, 90 equipartitions in workstation upper end are provided with four screw type magnet, just four screw type magnet on the sleeve with four screw type magnet position one-to-one and polarity on the workstation are the same.

Furthermore, the screw type magnet has an adsorption force of 0.4kg and a magnetic flux value of 4000-4400 gauss.

Furthermore, the workbench of the lower positioning table is of a cylindrical structure and is uniformly provided with rectangular grooves at 90 degrees.

Further, the lower positioning table adopts a Morse taper cylindrical surface with the ratio of 1: 16.

Furthermore, the lower end of the lower positioning table is provided with a 15-degree guide spigot.

Furthermore, a cylindrical horn mouth centering structure corresponding to the position of the workbench is arranged at the center of the lower surface of the upper pressure plate. And cross grooves with certain width are uniformly distributed on the cylindrical bell mouth centering structure for 90 degrees.

The utility model has the beneficial effects that: the method simplifies and unifies the procedures of fixing the measured object, centering and leveling, solves the problem that the service life of the measuring needle is short due to the fact that the lens shakes in the measuring process due to low precision of the clamp and unstable placement of the lens, and ensures that a corresponding surface type result can be obtained by detecting a single lens once, so that the detection efficiency is greatly improved, and the stability and consistency of the measuring result are improved.

Drawings

FIG. 1 is a cross-sectional view of a front view of the device of the present invention.

Fig. 2 is a perspective view of the device of the present invention.

FIG. 3 is a schematic view of the device of the present invention after placement of the lens.

Figure 4 is a perspective view of a sleeve of the device of the present invention.

Fig. 5 is a perspective view of the lower positioning table of the apparatus of the present invention.

Fig. 6 is a perspective view of the upper platen of the apparatus of the present invention.

Detailed Description

As shown in fig. 1-3, the magnetic levitation type lens centering device of the present invention comprises a work base 1, a screw type magnet 2, a sleeve 3, a lower positioning table 4 and an upper pressing plate 6. The screw type magnet 2 is screwed into the working base table 1 and the sleeve 3; the lower positioning table 4 is fixed on the working base table 1 through M4-50 socket head cap screws 5 to form a bearing set, and the M4-50 socket head cap screws 5 penetrate through a central hole of the lower positioning table 4; the upper pressure plate 6 and the sleeve 3 are fixedly connected through an M3-10 hexagon socket head cap screw 7 to form a gland sleeve set.

As shown in fig. 4, the upper end of the sidewall of the sleeve 3 is provided with the U-shaped opening 31 with different heights and widths for the inlet and outlet of the lens to be measured with different outer diameters, the 90 ° uniform distribution of the lower end of the sleeve 3 is provided with four screw type magnets 2, the 90 ° uniform distribution of the upper end of the work base table 1 is provided with four screw type magnets 2, and the four screw type magnets 2 on the sleeve 3 correspond to the four screw type magnets 2 on the work base table 1 one by one and have the same polarity, as follows: the corresponding positions all adopt N poles or S poles, the adsorption force of a single screw type magnet 2 is 0.4kg, the magnetic flux value of the magnetic force is 4000-4400 gauss, the distance between the two screw type magnets 2 at the corresponding positions is adjusted by utilizing the principle that the N pole and the N pole or the S pole and the S pole are mutually exclusive, the repulsive force is close to a single 0.1kg, the buffering effect is achieved, the impact contact between a high-precision lens and the lower positioning table 4 is avoided, and the lens is prevented from being crushed and crushed. The screw type magnet 2 has the same structure as a countersunk head screw, and the only difference is that the end of the screw type magnet 2 is magnetized.

The workbench 41 of the lower positioning table 4 adopts a cylindrical structure and is uniformly provided with rectangular grooves 42 at 90 degrees, the main function of one group of deep and wide rectangular grooves 42 is to facilitate the clamping of the lens, and in addition, the deep and wide rectangular grooves and the other group of shallow and narrow rectangular grooves 42 together reduce too many contact surfaces, thereby improving the positioning precision. The lower positioning table 4 adopts a Morse taper cylindrical surface with the ratio of 1:16 for meeting the centering precision of the high-precision lens, can well guide and position, and ensures that a part matched with the cylindrical surface is fully centered with the high-precision cylindrical surface; the lower end of the lower positioning table 4 is provided with a 15-degree guide spigot 43 which can play a role in auxiliary braking and buffering when in contact, so that the impact on the high-precision lens is reduced, as shown in fig. 5.

The lower surface central point of upper platen 6 puts and is provided with the cylindricality horn mouth centering structure 61 that corresponds with workstation 41 position to correspond the lens of different shapes such as unsmooth, biconvex, biconcave, the last 90 equipartitions of cylindricality horn mouth centering structure 61 are provided with cross groove 62 of certain width, with the reduction contact surface, improve positioning accuracy, reduce the destruction to the lens surface, as shown in fig. 6.

During assembly, a bearing sleeve group consisting of the lower positioning table 4 and the working base table 1 is placed on the reference working table, and a gland sleeve group consisting of the upper pressure plate 6 and the sleeve 3 is sleeved on the bearing sleeve group to complete the assembly of the whole structure. In a non-working state, due to the principle that the positions of the screw type magnets 2 contained in the working base table 1 and the sleeve 3 correspond one to one and the polarities of the screw type magnets are the same, the screw type magnets repel each other, the gland bush set and the bearing bush set are not in complete contact, and a gap exists. Before testing, the gland sleeve set needs to be lifted to a certain height according to the thickness of a lens to be tested, a proper U-shaped opening 31 on the sleeve 3 is selected according to the size of the lens to be tested, a high-precision lens is placed on a workbench 41 of a lower positioning table 4 of a bearing sleeve set by using tweezers, the gland sleeve set is released, a cylindrical horn mouth centering structure 61 on an upper pressure plate 6 in the gland sleeve set and the workbench 41 of the lower positioning table 4 are in full contact with an aspheric lens of a rotary symmetric structure under the mutual action force, the coaxiality of the three parts is infinitely close, and therefore automatic positioning is achieved; after the contact requirement is finished, the cover pressing sleeve set can be lifted for a certain distance according to the principle that like poles of the screw type magnet 2 on the sleeve 3 and the screw type magnet 2 on the working base table 1 repel each other, so that buffer protection is performed.

The device adopts 'lifting' (lifting the gland sleeve group) 'putting' (putting the sample to be detected into the workbench 41), loosens the lifted gland sleeve group, the lens is tightly contacted with the workbench 41 and the gland sleeve group, and the lens is positioned and centered, thereby ensuring that the centering position precision of the lens is infinitely close to the set centering position of the device, increasing the reliability of the detection result, easily and economically realizing the auxiliary detection of the precise aspheric optical part, accurately controlling the lens deviation problem in the detection process and ensuring the surface type precision of the aspheric optical part.

When the sleeve 3 of the device is matched with the lower positioning table 4, under the condition of no external force, the distance is about 10mm, and the dead weight of the sleeve 3 and the repulsive force of the two magnets are balanced and are in a static state. Five lenses with different thicknesses are adopted for experimental measurement, the centering of the lenses can be realized only by downwards using 250-315 g of pressure, after the pressure is removed, the reaction force vertically upwards resets the sleeve 3 to the position of 10mm, and the precision error of manually separating the sleeve 3 from the lower positioning table 4 is avoided.

The device belongs to a high-precision centering device, and is applied to high-precision lenses, and except a screw type magnet 2, other parts are made of stainless steel materials, such as 304 or 316L. The device of the utility model is used in a dust-free workshop, so that the problems of influence on positioning precision, product appearance pollution and the like caused by corrosion of materials are not allowed.

The problems that the existing reason is the precision reason of a detection clamp, the to-be-detected lens is difficult to ensure to be placed perfectly, the lens jumps in the detection process, the results of the detection of the same lens are different and the consistency is poor frequently occur, the time is wasted, and the cost is increased. The leveling platform for auxiliary detection of the lens surface type is a magnetic suspension type lens centering clamp of PGI equipment, and the working table 41 of the lower positioning table 4 is matched with the cylindrical horn mouth centering structure 61 of the upper pressing plate 6, so that automatic centering of the lens under the mutual acting force is realized, and the detection accuracy is improved; due to the ingenious fixing method, the phenomenon that the lens is poor in appearance due to sliding deviation during detection and needs secondary detection due to the fact that the lens is not laid flat and is eccentric can be effectively avoided, the yield of products is improved, and the detection efficiency can be improved by more than three times.

Claims (10)

1. Magnetic levitation formula lens centring means, its characterized in that: lower locating platform (4) is fixed on work base platform (1), top board (6) and sleeve (3) fixed connection, sleeve (3) lower extreme is provided with screw type magnet (2), work base platform (1) upper end is provided with screw type magnet (2), just screw type magnet (2) on sleeve (3) with screw type magnet (2) position on the work base platform (1) corresponds and the polarity is the same.

2. The magnetic levitation lens centering device of claim 1, wherein: the lower positioning table (4) is fixed on the working base table (1) through M4-50 hexagon socket head cap screws (5), and the M4-50 hexagon socket head cap screws (5) penetrate through the central hole of the lower positioning table (4).

3. The magnetic levitation lens centering device of claim 1, wherein: the upper end of the side wall of the sleeve (3) is provided with U-shaped openings (31) with different heights and widths.

4. The magnetic levitation lens centering device of claim 1, wherein: sleeve (3) lower extreme 90 equipartitions are provided with four screw type magnet (2), 90 equipartitions in work base platform (1) upper end are provided with four screw type magnet (2), just four screw type magnet (2) on sleeve (3) with four screw type magnet (2) on the work base platform (1) position one-to-one and polarity are the same.

5. The magnetic levitation lens centering device of claim 1, wherein: the adsorption force of the screw type magnet (2) is 0.4kg, and the magnetic flux value of the magnetic force is 4000-4400 gauss.

6. The magnetic levitation lens centering device of claim 1, wherein: the workbench (41) of the lower positioning table (4) adopts a cylindrical structure and is uniformly provided with rectangular grooves (42) at 90 degrees.

7. The magnetic levitation lens centering device of claim 1, wherein: the lower positioning table (4) adopts a Morse taper cylindrical surface with the ratio of 1: 16.

8. The magnetic levitation lens centering device of claim 1, wherein: the lower end of the lower positioning table (4) is provided with a 15-degree guide spigot (43).

9. The magnetic levitation lens centering device of claim 1, wherein: and a cylindrical horn mouth centering structure (61) corresponding to the position of the workbench (41) is arranged at the center of the lower surface of the upper pressure plate (6).

10. The magnetic-levitation lens centering device of claim 9, wherein: cross grooves (62) with certain width are uniformly distributed on the cylindrical bell mouth centering structure (61) at 90 degrees.

Images