Reflector back three-point supporting and positioning device and bonding method thereof

Abstract

The invention relates to the technical field of optical reflectors, in particular to a reflector back three-point supporting and positioning device and a bonding method thereof, and the positioning device comprises a positioning plate, a positioning adjusting mechanism and a supporting group; three mounting seats and a positioning reference are uniformly distributed on the positioning plate; each positioning adjusting mechanism comprises a manual adjusting assembly and an electric adjusting assembly, and in the electric mode, the electric adjusting assemblies drive the manual adjusting assemblies to rotate so that the positioning parts can be aligned with the positioning reference; in the manual mode, the manual adjusting assembly performs fine adjustment through the rotating rod, so that the positioning part is aligned with the positioning reference; the supporting assembly comprises a flexible joint and a nesting sleeve, a cross-shaped groove is formed in the upper surface of the flexible joint, the flexible joint is connected with the manual adjusting assembly through the cross-shaped groove, and the positioning adjusting mechanism drives the flexible joint to rotate. The device has the advantages that the relative positions of the flexible joint, the nesting and the reflecting mirror are controlled through the manual adjusting assembly and the electric adjusting assembly, and it is ensured that the position and design of the flexible structure of the flexible joint are the same.

Description

Technical Field

[0001] The present invention relates to the technical field of optical mirrors, and particularly relates to a three-point support and positioning device for the back of a mirror and a bonding method thereof. Background Art

[0002] Large-aperture mirrors are one of the most important optical components in space cameras. Their surface shape accuracy and spatial position change amount seriously affect the imaging quality of the whole machine. Silicon carbide (SiC) has now become a commonly used material for the mirrors of optical devices. It has excellent mechanical properties, thermophysical properties, and optical processing properties, etc., and is commonly used in the research and development and production of large-aperture mirrors. However, the silicon carbide material is extremely hard and brittle, and cannot be processed with threaded holes for connection and application like metal materials. At the same time, due to the small linear expansion coefficient of the silicon carbide material, a nesting made of an invar (4J36) material with a matched linear expansion coefficient is widely used and bonded to the silicon carbide mirror. The glue between the two is a two-component epoxy glue. Since the linear expansion coefficients of the nesting and the silicon carbide mirror are similar, when the ambient temperature changes, due to their synchronous thermal expansion and contraction, the thermal stress on the mirror can be effectively reduced, thereby improving the surface shape accuracy of the mirror and improving the imaging quality of the space camera.

[0003] Connected to the invar nesting is a titanium alloy (TC4) flexure. Multiple flexible grooves made by wire cutting processes in a specific direction are machined on it, which reduces the stiffness of the structure and improves the flexibility. It can effectively reduce the assembly stress when the flexure is connected to structures such as the nesting, and offset a part of the thermal stress when the temperature changes, which can improve the surface shape accuracy of the mirror. The mirror assembly consists of a mirror, a nesting, and a flexure. Three-point support on the back is a commonly used back support method for large-aperture mirrors. With the geometric center of the mirror as the center of the circle, three groups of nestings and flexures are evenly distributed on a certain dividing circle at intervals of 120°. Usually, the flexure and the nesting are first assembled together, and then the epoxy glue is evenly applied to the inner wall of the bonding hole between the mirror and the nesting and the outer wall of the nesting. After the glue between the nesting and the mirror is cured, it is connected to the backplane through multiple mounting holes on the three groups of flexures. However, after the flexure and the nesting are installed together, an assembly body that can freely rotate in the mounting hole on the back of the mirror is formed, and it can freely rotate around the z-axis. It is impossible for manual operation to determine the relative position between the assembly body of the three groups of flexures and the nesting and the mirror. On the one hand, due to the flexible structure with a specific direction machined on the flexure, the flexure needs to be rotated to a certain determined position. On the other hand, if the direction of the flexure is not controlled and allowed to cure freely, it is easy to cause the flexure to be unable to be smoothly connected to the mounting hole of the backplane, resulting in incorrect assembly. Summary of the Invention

[0004] In view of this, the present invention aims at a three-point support positioning device for the back of a mirror and its bonding method. By means of a manual adjustment component and an electric adjustment component, the positioning part is aligned with the positioning reference, so as to realize the positioning in a specific direction of the flexible joint.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows: A three-point support positioning device for the back of a mirror, comprising: a positioning plate, on which three mounting seats and a positioning reference are evenly arranged; a positioning adjustment mechanism, there are three positioning adjustment mechanisms, and each positioning adjustment mechanism includes a manual adjustment component and an electric adjustment component. The manual adjustment component is connected to the mounting seat, and the electric adjustment component is arranged on the upper surface of the positioning plate; the electric adjustment component is connected to the manual adjustment component; a positioning part is provided at a preset position of the manual adjustment component. In the electric mode, the electric adjustment component drives the manual adjustment component to rotate so that the positioning part aligns with the positioning reference; in the manual mode, the manual adjustment component is finely adjusted through a rotating rod to align the positioning part with the positioning reference; a support component, the support component includes a flexible joint and a nested part, the flexible joint is connected to the nested part, and the nested part is connected to the mirror; a cross groove is provided on the upper surface of the flexible joint, and the lengths of the horizontal section and the vertical section of the cross groove are not equal; the fixed end of the flexible joint is connected to the positioning plate, the flexible joint is connected to the manual adjustment component through the cross groove, and the positioning adjustment mechanism drives the flexible joint to rotate.

[0006] Further, the manual adjustment component includes a connecting seat, an adjustment rod and a rotating rod; the connecting seat is connected to the mounting seat through a bearing; the lower end surface of the adjustment rod is connected to the upper end surface of the connecting seat. A through hole penetrating radially along the adjustment rod is provided near the upper end of the adjustment rod, and a set screw hole is provided on the top surface of the adjustment rod. The rotating rod passes through the through hole, and the set screw passes through the set screw hole to fix the rotating rod; a cross boss adapted to the cross groove is provided on the lower end surface of the connecting seat.

[0007] Further, the positioning part is a boss, and the boss is arranged at a preset position of the connecting seat. A receiving groove is provided at the position of the adjustment rod corresponding to the boss for receiving the boss.

[0008] Further, the positioning part is a plane, and the plane is arranged at a preset position on the outer circumferential surface of the connecting seat.

[0009] Further, the electric adjustment component includes a motor, a motor seat, a first gear and a second gear. The motor is connected to the positioning plate through the motor seat. The first gear is connected to the output shaft of the motor. The first gear meshes with the second gear, and the second gear is connected to the adjustment rod; the motor drives the second gear to rotate through the first gear, thereby driving the adjustment rod to rotate.

[0010] Further, an observation port is also provided at the position of the motor seat corresponding to the positioning part for observing whether the positioning part is aligned with the positioning reference.

[0011] A three-point support bonding method for the back of a mirror, which is realized by using the above-mentioned three-point support positioning device for the back of the mirror, includes the following steps: S1. Fix the flexible joint and the nested part with bolts.

[0012] S2. Apply epoxy glue evenly on the outer surface of the nested part and the inner surface of the mounting hole of the mirror, and put the flexible joint and the nested part into the mounting hole.

[0013] S3. Manually adjust the adjusting rod so that the cross-shaped boss of the adjusting rod matches the cross-shaped groove.

[0014] S4. Start the motor to make the flexible joint and the nested part rotate a preset number of turns in the mounting hole.

[0015] S5. Rotate the rotating rod, and then drive the flexible joint and the nested part to rotate by the adjusting rod until the positioning part is aligned with the positioning reference.

[0016] S6. Fix the flexible joint on the positioning plate with positioning screws until the epoxy glue in step S2 cures.

[0017] Compared with the prior art, the present invention can achieve the following beneficial effects: The present invention controls the relative bonding and curing position of the flexible joint and the nested assembly with the mirror through the manual adjustment component and the electric adjustment component, ensuring that the position of the flexible structure of the flexible joint is the same as the design. It can also realize the rotation of the flexible joint and the nested assembly in the mounting hole on the back of the mirror. When the flexible joint rotates to the optimal position, fix the flexible joint and the positioning plate with positioning screws until the curing is completed. On the one hand, it can make the actual curing position of the flexible joint the same as the design position, and at the same time ensure that multiple mounting holes at the ends of the three flexible joints can be smoothly connected to the back plate. Description of the Drawings

[0018] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 is a schematic structural diagram of the three-point support positioning device for the back of the mirror provided by the embodiment of the present invention; Figure 2 is a sectional view of the three-point support positioning device for the back of the mirror provided by the embodiment of the present invention; Figure 3 is a schematic structural diagram of the three-point support positioning device for the back of the mirror without the mirror provided by the embodiment of the present invention; Figure 4 is a schematic structural diagram of the positioning plate provided by the embodiment of the present invention; Figure 5It is a schematic structural diagram of a positioning adjustment mechanism provided according to an embodiment of the present invention; Figure 6 It is a schematic structural diagram of a manual adjustment component with a positioning part as a boss provided according to an embodiment of the present invention; Figure 7 It is a schematic structural diagram of a manual adjustment component with a positioning part as a plane provided according to an embodiment of the present invention; Figure 8 It is a schematic structural diagram of a motor base provided according to an embodiment of the present invention.

[0019] The reference numerals include: 1, positioning plate; 11, mounting seat; 2, positioning adjustment mechanism; 21, manual adjustment component; 211, connecting seat; 212, adjusting rod; 213, rotating rod; 214, positioning part; 215, through hole; 216, setscrew hole; 217, setscrew; 218, cross boss; 22, electric adjustment component; 221, motor; 222, motor base; 2221, vertical plate; 2222, upper plate; 2223, lower plate; 2224, rib plate; 2225, observation port; 223, first gear; 224, second gear; 3, support component; 31, flexible joint; 32, nesting; 33, cross groove; 4, mirror. Detailed implementation manners

[0020] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention.

[0021] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0023] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0025] As Figures 1 - 5 shown, a three-point support and positioning device for the back of a reflector provided by an embodiment of the present invention includes: a positioning plate 1, a positioning and adjusting mechanism 2, and a support assembly 3. Three mounting seats 11 and a positioning reference are evenly arranged on the positioning plate 1. There are three positioning and adjusting mechanisms 2, corresponding to the three mounting seats 11 respectively. Each positioning and adjusting mechanism 2 includes a manual adjusting component 21 and an electric adjusting component 22.

[0026] In this embodiment, the structure of the positioning plate 1 is composed of an equilateral triangular plate and three mounting seats 11. The three mounting seats 11 are respectively located at positions close to the three corners of the triangular plate, and the three mounting seats 11 are distributed at 120° to each other. A through hole is also provided at the geometric center of the triangular plate, that is, the geometric center of the positioning plate 1. The center of the through hole coincides with the geometric center of the reflector 4, and thus the geometric center of the positioning plate 1 is set as the positioning reference.

[0027] As Figures 5 - 7 shown, the manual adjusting component 21 includes a connecting seat 211, an adjusting rod 212, a rotating rod 213, and a positioning portion 214. The connecting seat 211 is connected to the mounting seat 11 through a bearing. The lower end surface of the adjusting rod 212 is connected to the upper end surface of the connecting seat 211. A through hole 215 is provided radially through the adjusting rod 212 near the upper end of the adjusting rod 212, and a set screw hole 216 is provided on the top surface of the adjusting rod 212. The rotating rod 213 passes through the through hole 215, and the set screw 217 passes through the set screw hole 216 to fix the rotating rod 213. A cross-shaped boss 218 adapted to the cross-shaped groove 33 is also provided on the lower end surface of the connecting seat 211. Manually rotating the rotating rod 213 drives the adjusting rod 212 to rotate so that the positioning portion 214 is aligned with the positioning reference.

[0028] When the positioning portion 214 is a boss, the boss is provided on the upper end surface of the first flange and is located at the edge of the first flange. The axis of the boss coincides with the projection of the axis of the long side of the cross of the cross-shaped boss 218 on the first flange. A receiving groove is provided at the position of the adjusting rod 212 corresponding to the boss for receiving the boss.

[0029] When the positioning portion 214 is a plane, the plane is a cut surface formed by cutting a part of the outer circumferential surface of the connecting seat 211, and the position of the plane is on one side of the long side of the cross of the cross boss 218.

[0030] By adopting the cross-shaped structure of the cross groove 33 and the cross boss 218 that can only be assembled in one direction, when the cross boss 218 cooperates with the cross groove 33, the axis of the positioning portion 214 of the connecting seat 211 is the direction of the double holes of the flexible groove of the flexible joint 31, ensuring the position accuracy of the installation of the flexible joint 31. Since after the flexible joint 31 and the nested 32 are installed together, the outer surface of the nested 32 has rotational symmetry, it is impossible to determine the accurate position around the z-axis by the human eye in the mounting hole on the back of the mirror 4. On the other hand, due to the flexible groove with a specific direction of the flexible joint 31, the structural form of the flexible groove and the relative position relationship with the mirror 4, the double holes of the flexible groove should point to the geometric center of the mirror 4. By setting the positional relationship between the cross of the cross groove 33 and the double holes of the flexible groove, and using the cooperation of the cross boss 218 and the cross groove 33, and the positioning portion 214, it is ensured that the double holes of the flexible groove of the flexible joint 31 point to the geometric center of the mirror 4.

[0031] The adjusting rod 212 includes a cylinder and a second flange. A step for limiting the second gear 224 is also provided on the cylinder. When the positioning portion 214 is a boss, the second flange is provided with a receiving groove.

[0032] In this embodiment, the bearing used is a double-row angular contact ball bearing. The upper end opening of the mounting seat 11 is provided with an internal thread. First, three groups of double-row angular contact ball bearings are placed into the three mounting seats 11, and the double-row angular contact ball bearings are fixed by applying a threaded retaining ring and the threaded connection of the mounting seat 11. The connecting seat 211 and the adjusting support rod are fixed by 6 M5x10 socket head cap screws. The connecting seat 211 connected with the adjusting rod 212 is passed through the double-row angular contact ball bearing, and the lower end surface of the first flange is abutted against the upper end surface of the double-row angular contact ball bearing. Then the rotating rod 213 is passed through the adjusting rod 212, and when the lengths on both sides of the adjusting rod 212 are approximately equal, it is fixed with an M6 set screw. When the electric adjusting component 22 is not provided in the present invention, it can also be adjusted by the manual adjusting component 21. When the electric adjusting component 22 is provided, the rotating rod 213 should be assembled with the adjusting rod 212 after the electric adjusting component 22 and the adjusting rod 212 are assembled.

[0033] The electric adjusting component 22 is arranged on the positioning plate 1 and is configured to drive the adjusting rod 212 to rotate by a preset number of turns to roughly adjust the position of the positioning portion 214 relative to the positioning reference.

[0034] The electric adjustment assembly 22 includes a motor 221, a motor base 222, a first gear 223 and a second gear 224. The motor base 222 is fixed on the positioning plate 1. The fixed end of the motor 221 is connected to the motor base 222. The first gear 223 is connected to the output shaft of the motor 221. The first gear 223 meshes with the second gear 224. The second gear 224 is sleeved on the adjustment rod 212. The motor 221 drives the second gear 224 to rotate through the first gear 223, thereby driving the adjustment rod 212 to rotate.

[0035] In this embodiment, the motor 221 is a stepping motor, the first gear 223 is a small gear, and the second gear 224 is a large gear. The connecting seat 211 includes a cylinder and a first flange. The cylinder has a structure with one end open and one end closed. The first flange is provided at the open end of the cylinder. The cross-shaped boss 218 is provided on the plane at the closed end of the cylinder.

[0036] The support assembly 3 includes a flexible joint 31 and a nest 32. The flexible joint 31 is connected to the nest 32, and the nest 32 is connected to the mirror 4. The upper surface of the flexible joint 31 is provided with a cross-shaped groove 33, and the lengths of the horizontal section and the vertical section of the cross-shaped groove 33 are not equal. The flexible joint 31 is connected to the manual adjustment assembly 21 through the cross-shaped groove 33 and rotates with the rotation of the manual adjustment assembly 21. The fixed end of the flexible joint 31 is connected to the positioning plate 1, and the free end of the flexible joint 31 is connected to the nest 32. The nest 32 provides stable rotational support for the mirror 4. The position of the longer section in the cross-shaped groove 33 is the position of the positioning portion 214 on the connecting seat 211.

[0037] When the mirror 4, the flexible joint 31 and the nest 32 are assembled, the double holes of the flexible groove of the flexible joint 31 point to the geometric center of the mirror 4. Therefore, in the present invention, the geometric center of the positioning plate 1 coincides with the geometric center of the mirror 4, and the geometric center of the positioning plate 1 is set as the positioning reference.

[0038] The present invention adopts a combination of electric control and manual control. The electric control method can make the assembly of the flexible joint 31 and the nest 32 rotate uniformly in the mounting hole of the mirror 4, which can make the epoxy glue on the outer surface of the nest 32 and the inner mounting hole of the back of the mirror 4 mix better and discharge the internal air bubbles, and perform rough adjustment on the flexible joint 31. Manual control can make a small adjustment to the rotation of the flexible joint 31 on the basis of electric control, determine the relative bonding and curing position of the assembly of the flexible joint 31 and the nest 32 and the mirror 4, and ensure that the position of the flexible structure of the flexible joint 31 is the same as the design. The present invention can realize the rotation of the assembly of the flexible joint 31 and the nest 32 around the z-axis in the back mounting hole of the mirror 4. When the flexible joint 31 rotates to the optimal position, the flexible joint 31 is fixed to the positioning plate 1 with positioning screws until the curing is completed.

[0039] During the bonding process, a certain amount of epoxy glue is applied to the outer surface of the nest 32 and the mounting holes on the back of the mirror 4. It is necessary for the assembly of the flexible joint 31 and the nest 32 to rotate a certain number of turns in the mounting holes to make the epoxy glue mix more evenly and remove the internal air bubbles. Therefore, the positioning and adjustment mechanism 2 is designed into a structure with manual adjustment and electric adjustment. The electric adjustment component 22 drives the flexible joint 31 and the nest 32 to rotate, enabling the removal of internal air bubbles and reducing the work intensity of the staff.

[0040] As Figure 8 shown, the motor base 222 includes a vertical plate 2221, an upper plate 2222 and a lower plate 2223. The upper plate 2222 and the lower plate 2223 are respectively connected to both ends of the vertical plate 2221, and the orientations of the upper plate 2222 and the lower plate 2223 are opposite, forming a motor base 222 similar to a Z shape. Rib plates 2224 are also provided on both sides of the upper plate 2222 and the vertical plate 2221 and on both sides of the lower plate 2223 and the vertical plate 2221 respectively. An observation port 2225 is also provided at the position corresponding to the positioning portion 214 on the plane of the vertical plate 2221 for observing whether the positioning portion 214 is aligned with the positioning reference. A kidney-shaped hole is also provided on the lower plate 2223 for adjusting the position of the motor 221.

[0041] The motor 221 is installed on the upper plate 2222. The output shaft of the motor 221 passes through the upper plate 2222 and is connected to the first gear 223. The second gear 224 passes through the adjusting rod 212 and abuts against the step of the adjusting rod 212, and it can be fixed by a set screw 217 or also by key connection. By adjusting the motor base 222, the position of the motor 221 is finely adjusted to make the first gear 223 and the second gear 224 mesh better.

[0042] When the motor 221 drives the adjusting rod 212 through the first gear 223 and the second gear 224 to make the flexible joint 31 reach the preset position, since the electric adjustment component 22 will block the staff's line of sight, a rectangular observation port 2225 is opened on the vertical plate 2221. Through this observation port 2225, the position state of the positioning portion 214 can be confirmed. If it is found that the positioning portion 214 is deviated (i.e., the position of the flexible joint 31 is inaccurate) and the motor 221 cannot complete precise adjustment, the rotating rod 213 can be inserted into the adjusting rod 212 for manual fine adjustment until the flexible joint 31 reaches the accurate position.

[0043] A three-point support bonding method for the back of a mirror is realized by using the above-mentioned three-point support positioning device for the back of the mirror, and includes the following specific steps: S1. Fix the flexible joint 31 and the nest 32 with bolts.

[0044] S2. Apply epoxy glue evenly to the outer surface of the nest 32 and the inner surface of the mounting hole of the mirror 4, and place the flexible joint 31 and the nest 32 into the mounting hole.

[0045] S3. Manually rotate the adjusting rod 212 so that the cross-shaped boss 218 of the adjusting rod 212 mates with the cross-shaped groove 33.

[0046] S4. Start the motor 221 to rotate the flexible joint 31 and the nest 32 a preset number of turns within the mounting hole.

[0047] S5. Rotate the rotating rod 213, and then drive the flexible joint 31 and the nest 32 to rotate by the adjusting rod 212 until the positioning portion 214 is aligned with the positioning reference.

[0048] S6. Fix the flexible joint 31 to the positioning plate 1 with positioning screws until the epoxy adhesive in step S2 cures.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

[0050] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A three-point support positioning device for the back of a reflector, characterized in that: include: A positioning plate, on which three mounting seats and a positioning reference are evenly arranged; Positioning adjustment mechanism, there are three positioning adjustment mechanisms, corresponding to the three mounting seats respectively; each positioning adjustment mechanism comprises a manual adjustment component and an electric adjustment component, the manual adjustment component is connected to the mounting seat, the manual adjustment component comprises a positioning part and an adjustment rod, the adjustment rod is manually rotated to align the positioning part with the positioning reference; the electric adjustment component is arranged on the positioning plate, and is configured to drive the adjustment rod to rotate according to a preset number of circles to roughly adjust the position of the positioning part relative to the positioning reference; A support assembly, the support assembly includes a flexible joint and a nesting, the upper surface of the flexible joint is provided with a cross groove, the horizontal section and the vertical section of the cross groove have unequal lengths; the cross groove is connected to the manual adjustment assembly and rotates with the rotation of the manual adjustment assembly; the fixed end of the flexible joint is connected to the positioning plate, and the free end of the flexible joint is connected to the nesting, and the nesting provides stable rotational support for the reflector.

2. The three-point support positioning device for the back of the reflector according to claim 1, characterized in that: The manual adjustment assembly also includes a connecting seat and a rotating rod; the connecting seat is connected to the mounting seat through a bearing, and a cross boss matched with the cross groove is provided on the lower end surface of the connecting seat; the adjusting rod is located above the connecting seat, and the lower end surface of the adjusting rod is connected to the upper end surface of the connecting seat, and a through hole radially penetrating the adjusting rod is provided at a position near the upper end of the adjusting rod, and a top screw hole is provided on the top surface of the adjusting rod, and the rotating rod passes through the through hole and is fixed in the top screw hole by a top screw.

3. The three-point support positioning device for the back of the reflector according to claim 2, characterized in that: The positioning portion is a boss, and the boss is arranged at a preset position of the connecting seat. A receiving groove is provided at a position of the adjusting rod corresponding to the boss, and the receiving groove is used to receive the boss.

4. The three-point support positioning device for the back of the reflector according to claim 2, characterized in that: The positioning portion is a plane, and the plane is arranged at a preset position on the outer circumferential surface of the connecting seat.

5. The three-point support positioning device for the back of the reflector according to claim 2, characterized in that: The electric adjustment component includes a motor, a motor seat, a first gear and a second gear. The motor seat is fixed on the positioning plate, and the fixed end of the motor is connected to the motor seat; the first gear is connected to the output shaft of the motor, the first gear is meshed with the second gear, and the second gear is connected to the adjustment rod; the motor drives the second gear to rotate through the first gear and then drives the adjustment rod to rotate.

6. The three-point support positioning device for the back of the reflector according to claim 5, characterized in that: An observation port is also provided at a position of the motor seat corresponding to the positioning portion, for observing whether the positioning portion is aligned with the positioning reference.

7. A method for bonding the back of a reflector with three points of support, implemented by using the three-point support positioning device for the back of a reflector according to any one of claims 1 to 6, characterized in that: The steps include: S1. The flexible section and the nest are fixed by bolts; S2. The outer surface of the nest and the inner surface of the mounting hole of the reflector are evenly coated with epoxy glue, and the flexible section and the nest are placed in the mounting hole; S3. Manually adjust the adjustment rod so that the cross boss of the adjustment rod matches the cross groove of the flexible section; S4. Start the motor of the electric adjustment assembly to rotate the flexible joint and the nested portion in the mounting hole a preset number of turns; S5. Rotate the rotating rod of the manual adjustment assembly so that the adjustment rod drives the flexible joint and the nested joint to rotate until the positioning portion is aligned with the positioning reference; S6. Fix the flexible joint to the positioning plate by means of positioning screws until the epoxy adhesive in step S2 is cured.

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