CN106324793A - Small diameter reflector supporting structure - Google Patents

Abstract

The invention relates to a support structure for a small-diameter reflector, which belongs to the technical field of support structures. The invention solves the problems of non-uniform bonding strength, sensitivity to temperature changes, and the like in the prior art of the adhesive reflector support structure. The supporting structure includes a mandrel, a back plate, a pressing mechanism, a pressing plate, a silicone pad and a backing ring, wherein the front end of the outer wall of the mandrel is provided with an arc-shaped ring, and the reflector can swing two-dimensionally around it. Axial movement and tangential rotation, the pressure plate is fixed in the groove on the front face of the mandrel, the silicone pad is fixed on the rear surface of the pressure plate and pressed on the front ring belt of the reflector, the backing ring is set outside the mandrel, and the front and rear surfaces There are respectively provided front and rear bosses which are in contact with the rear ring belt of the reflector and the front surface of the back plate, and the pressing mechanism presses the backing ring and the back plate onto the shaft shoulder of the mandrel. The support structure can ensure the precise positioning of the reflector, and the surface shape will not be affected under different temperatures and different pitch angles, and it can withstand slight shock and vibration under transportation conditions.

Description

A Supporting Structure for Small Aperture Reflector

technical field

The invention belongs to the technical field of support structures, and in particular relates to a support structure for small-diameter (below 300mm) reflectors, especially suitable for supporting small-diameter meniscus-shaped lightweight reflectors.

Background technique

With the intensification of human space activities, a large number of space targets are distributed in the earth orbit space (space targets mainly refer to satellites, including working satellites and non-working satellites, and also include space debris, such as booster rockets entering space orbit, protection hoods and other objects, as well as various space objects entering the outer space of the earth, such as comets and asteroids), these space objects have seriously affected human space activities. Therefore, we need to know the number, distribution, orbit, and status of space targets to meet the needs of space early warning and information countermeasures. These behaviors of detecting and identifying space targets and obtaining information are space situational awareness. In the prior art, the data sources of space target detection and recognition are mainly through optoelectronic equipment and radio equipment. Among them, optical equipment has the characteristics of high imaging resolution, high sensitivity, and long detection distance due to its short wavelength band and the use of target reflection or radiation information for detection, and plays an important role in supporting space situational awareness.

Optoelectronic equipment used for space target detection is mainly divided into two types: ground-based and space-based. Compared with space-based detection equipment, ground-based detection equipment has the advantages of easy installation, commissioning, maintenance, upgrading and transformation, and relatively low cost under the same caliber, so it is more widely used. In the ground-based detection equipment, there are large-aperture telescopes (main aperture is generally 0.6m ~ 8m) and multiple small-aperture lenses (aperture below 300mm), and the large-aperture telescopes are combined with various terminals to obtain data. Various characteristics of air targets in the background are monitored and measured. Since the mirror surface of a large-aperture telescope and multiple small-aperture lenses is deformed by its own weight at different pitch angles, which affects the detection results, it is necessary to adopt a supporting structure to prevent its mirror surface from being deformed by its own weight. Large-aperture telescopes often use active support structures to correct the mirror surface shape in real time, such as hydraulic and pneumatic drive units. Small-aperture lenses mostly use reflectors as the main mirror (in order to reduce the weight of the equipment, the main mirror is usually designed with a meniscus shape while maintaining sufficient rigidity), and adopt a passive support structure. The common structure is shown in Figure 1-3, including the core Shaft 1 , back plate 3 , first lock nut 4 and second lock nut 5 . Wherein, the front end face of the mandrel 1 is provided with a flange 11, and the outer wall is provided with a first annular belt 12, a second annular belt 13 and a third annular belt 14 sequentially from front to back, and the first annular belt 12 is provided with an adhesive joint. An annular belt 121 and a plurality of glue guide grooves 122, the glue guide grooves 122 are evenly distributed on the circumference, and are arranged to run through the first annular belt 12 in the axial direction, the glue flows into the bonding annular belt 121 from the glue guide grooves 122, and the reflector 2 The inner wall of the through hole is bonded and fixed on the first annular belt 12 by glue, the back plate 3 is set outside the second annular belt 13, the rear annular belt of the reflector 2 is in contact with the front surface of the back plate 3, and the third annular belt 13 There are external threads on the top, and the first lock nut 4 and the second lock nut 5 are screwed on the third ring belt 14 to press the back plate 2 on the shaft shoulder 15 . The dimension A of the first ring belt 12 is 0.3mm longer than the dimension B of the reflector 2, when the first lock nut 4 and the second lock nut 5 press the back plate 3, the reflector 2 can still rotate around the mandrel 1 , to prevent the front end of the mandrel 1 from protecting the flange 11 from exerting pressure on the mirror surface of the reflector 2, thereby affecting the surface shape accuracy. Although this support structure can play the role of supporting the reflector, it still has the following disadvantages: one is that the gap between the mandrel 1 and the inner wall of the through hole of the reflector 2 is very small (generally tens of microns), so it is easy to have bonding The problem of uneven strength, the second is that due to the fluidity of the glue, it often causes glue between the rear surface of the reflector 2 and the back plate 3, and when the support structure of the reflector changes with temperature, it will be unfavorable to the shape of the mirror surface The third is that due to the use of glue to fix, once it fails, it will take a long time to degumming and re-gluing, which is time-consuming and laborious.

Contents of the invention

The purpose of the present invention is to solve technical problems such as uneven adhesive strength, sensitivity to temperature changes, cumbersome operation and the like existing in the support structure of the reflector in the prior art, and to provide a support structure of the reflector with a small diameter.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows.

Small-aperture mirror support structure, including mandrel, back plate and pressing mechanism;

The outer wall of the mandrel is provided with a first annular zone, a second annular zone and a third annular zone with successively decreasing outer diameters from front to back, the reflector is set outside the first annular zone, and the back plate is set on the second annular zone. Outside the ring belt, the pressing mechanism is set on the third ring belt;

Also includes, pressure plate, silicone pad and grommet;

The edge circumference of the front end surface of the mandrel is uniformly provided with a plurality of grooves, and the front end of the outer wall of the first ring is provided with an arc-shaped ring with a section in contact with the inner wall of the through hole of the reflector;

There are multiple pressing plates, and each pressing plate is fixed in a groove;

There are a plurality of silica gel pads, and each silica gel pad is fixed on the rear surface of a pressure plate and pressed against the front ring belt of the reflector;

The front surface of the backing ring is evenly distributed on the circumference and is provided with a plurality of front bosses that are in contact with the rear ring belt of the reflector, and any adjacent two front bosses are provided with a boss that is connected with the front bosses and has the same height. The arc belt, the convex arc belt is in contact with the shaft shoulder, and the outer diameter of the convex arc belt is smaller than the outer diameter of the shaft shoulder;

The rear surface of the backing ring is uniformly distributed on the circumference and provided with a plurality of rear bosses in contact with the front surface of the back plate;

A plurality of front bosses, a plurality of rear bosses and a plurality of pressure plates correspond to the circumferential direction of the mandrel;

The pressing mechanism presses the backing ring and the back plate against the shaft shoulder.

Further, a plurality of threaded holes are provided at the bottom of the groove, and the pressure plate is fixed in the groove by screws.

Further, there are three grooves, and two threaded holes are provided at the bottom of each groove.

Further, the front annular zone of the reflector is stepped and arranged at the front end of the through hole of the reflector, and the rear annular zone of the reflector is arranged on the rear surface of the reflector.

Further, the outer edge of the pressure plate is arc-shaped and the diameter of the outer edge is smaller than the outer diameter of the front ring of the reflector.

Further, a step is provided on the rear surface of the pressing plate, and the silicone pad is fixed in the step.

Further, the central angle corresponding to the front boss is 30°.

Further, the outer wall of the third ring is provided with external threads, and the pressing mechanism is composed of a first lock nut and a second lock nut, and the first lock nut and the second lock nut are screwed sequentially from front to back. Tight on the third ring belt.

Further, the materials of the mandrel, the pressure plate and the backing ring are all made of 4J32 Invar with a coefficient of thermal expansion of 0.07E-6/°C.

Compared with prior art, the beneficial effect of the present invention is:

The mandrel of the supporting structure of the small-diameter reflector of the present invention is provided with a high-precision circular arc-shaped annular band, which can ensure that the reflector performs two-dimensional swing, axial movement and tangential rotation around it; the pressing mechanism The back plate and backing ring are pressed against the shaft shoulder by the pressing force, and the pressing force will not be transmitted to the reflector. By adjusting the gap in the axial dimension, the silicone pad is pre-deformed. The pressing plate in front of the reflector and the back of the reflector The front and rear bosses on the backing ring jointly apply the pressing force and static friction force to constrain the two-dimensional swing, axial movement and tangential rotation of the reflector, and finally realize the precise positioning of the reflector by limiting the six degrees of freedom of the reflector , to ensure that the surface shape of the mirror is not affected at different pitch angles, and can withstand slight shock vibration under transportation conditions;

The support structure of the small-diameter reflector of the present invention, the mandrel, the pressure plate and the backing ring are made of 4J32 Invar material with a thermal expansion coefficient similar to that of the reflector, which reduces the sensitivity of the support structure to temperature and ensures that the support structure can be used in a wide range of temperature changes. use within;

The supporting structure of the small-diameter reflector of the present invention is suitable for the installation of various reflectors, especially suitable for the installation of small-diameter (below 300mm) meniscus light-weight reflectors.

Description of drawings

Fig. 1 is the assembly diagram of the supporting structure of small and medium-diameter mirrors in the prior art;

Fig. 2 is the half-section front view of the mandrel of the support structure of the small-diameter reflector in the prior art;

Fig. 3 is the left side view of the mandrel of the support structure of the small-diameter reflector in the prior art;

Fig. 4 is the assembly diagram of the small-aperture reflector support structure of the present invention;

Fig. 5 is a half-section front view of the mandrel of the small-aperture reflector support structure of the present invention;

Fig. 6 is the left side view of the mandrel of the small-aperture reflector support structure of the present invention;

Fig. 7 is the front view of the backing ring of the small-aperture reflector support structure of the present invention;

Fig. 8 is A-A sectional view of Fig. 7;

Fig. 9 is the rear view of the backing ring of the small-aperture reflector support structure of the present invention;

Fig. 10 is a left view of the assembly structure of the mandrel, pressure plate and backing ring of the small-aperture reflector support structure of the present invention (without the reflector);

Fig. 11 is a left side view (including the mirror) of the assembly structure of the mandrel, the pressure plate and the backing ring of the small-aperture mirror supporting structure of the present invention;

Among the figure: 1, mandrel, 11, flange, 12, first ring belt, 121, bonding ring belt, 122, glue guiding groove, 123, groove, 1231, threaded hole, 124, the section is arc-shaped The ring belt, 13, the second ring belt, 14, the third ring belt, 15, the shoulder, 2, the reflector, 3, the back plate, 4, the first lock nut, 5, the second lock nut, 6 , pressing plate, 7, silica gel pad, 8, backing ring, 81, front boss, 82, convex arc belt, 83, rear boss.

detailed description

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 4 (the symmetrical structure is omitted in the figure), the supporting structure of the small-aperture reflector of the present invention includes a mandrel 1, a back plate 3, a first lock nut 4, a second lock nut 5, a pressure plate 6, and a silica gel Pad 7 and Pad Ring 8.

Wherein, as shown in Fig. 5 and Fig. 6, the outer wall of the mandrel 1 is provided with the first endless belt 12, the second endless belt 13 and the third endless belt 14 successively from front to back, the first endless belt 12, the second annular belt The outer diameters of the belt 13 and the third endless belt 14 decrease successively.

The length of the first annular band 12 is slightly less than the length of the through hole of the reflector 2; the edge circumference of the front end face of the first annular band 12 is uniformly provided with a plurality of grooves 123, generally three, and the groove 123 is provided with There are threaded holes 1231; the front end of the outer wall of the first annular band 12 is provided with a circular arc-shaped annular band 124 in section, and the arc-shaped annular band 124 adopts a high-precision design, and the radian is not particularly limited. The annular belt 124 having a circular arc section performs two-dimensional swing, axial movement and tangential rotation.

The length of the second annular band 13 (including the undercut) is slightly shorter than the sum of the length of the through hole of the back plate 3 and the thickness of the backing ring 8 .

The length of the third annular band 14 (including the undercut) is slightly greater than the sum of the thicknesses of the first locking nut 4 and the second locking nut 5 , and the outer wall of the third annular band 14 is provided with external threads.

The reflecting mirror 2 is sleeved outside the first annular band 12 through its through hole. The structure of the reflector 2 is not particularly limited, and is preferably a meniscus reflector. Usually, the front annular zone of reflector 2 is stepped, and is arranged on the front end of the through hole of reflector 2, and the rear annular zone of reflector 2 is arranged on the rear surface of reflector 2, and the front annular zone of this reflector 2 and the back The structure of the ring is a common structure of the mirror ring in the prior art.

The back plate 3 is sleeved outside the second ring belt 13 through its through hole. The back plate 3 is used to connect the mandrel 1 and the lens housing. The structure is not particularly limited, and the back plate in the prior art is applicable to the present invention.

The outer edge of the pressing plate 6 is arc-shaped and the diameter of the outer edge is smaller than the outer diameter of the front ring of the reflector 2, which can avoid stress concentration due to contact and affect the surface shape accuracy of the reflector 2. The rear surface of the pressing plate 6 is provided with a step. The number of pressing plates 6 is the same as the number of grooves 123 , and one pressing plate 6 is fixed in one groove 123 by screws.

The quantity of the silicone pad 7 is the same as that of the pressing plate 6, and a silicone pad 7 is fixed in the step of a pressing plate 6, and is pressed on the front ring belt of the reflector 2. The shape of the silicone pad 7 preferably matches the step shape of the pressure plate 6 .

As shown in Figures 7-9, the backing ring 8 is an annular spacer, and the front surface of the backing ring 8 is evenly distributed on the circumference and is provided with a plurality of front bosses 81 that are in contact with the rear ring belt of the reflector 2, preferably the front bosses The central angle corresponding to 81 is 30°; between any two adjacent front bosses 81, there is a convex arc belt 82 connected with the front boss 81 and of the same height, the convex arc belt 82 is in contact with the shaft shoulder 15, and the convex arc belt 82 is in contact with the shaft shoulder 15, and the The outer diameter of the arc belt 82 is smaller than the outer diameter of the shaft shoulder 15;

A plurality of rear bosses 83 contacting the front surface of the backboard 2 are evenly distributed on the back surface of the backing ring 8 .

The first lock nut 4 and the second lock nut 5 form a pressing mechanism, and the first lock nut 4 and the second lock nut 5 are screwed on the third ring belt 14 sequentially from front to back, and the backing ring 8 and The backboard 3 is pressed and fixed on the shoulders 15 of the first endless belt 12 and the second endless belt 13 .

As shown in Figures 10-11, in the present invention, in order to realize that the force acting points on the front and back sides of the reflector 2 are the same, a plurality of front bosses 81, a plurality of rear bosses 83 and a plurality of pressure plates 6 are placed on the center of the mandrel 1. corresponding to the circumferential direction.

In the present invention, the thermal expansion coefficient of the microcrystalline material used in the reflector 2 is generally 0.1E-6/°C, and the material of the mandrel 1, the pressure plate 6 and the backing ring 8 is preferably 4J32 Invar with a thermal expansion coefficient of 0.07E-6/°C , so that by rationally adjusting the radial fit clearance, it can be ensured that the support structure does not affect the mirror shape accuracy of the reflector 2 within a wide temperature range.

The assembly process of the small-diameter reflector supporting device of the present invention is as follows: the backing ring 8 and the back plate 3 are assembled with the shoulder 15 of the mandrel 1 from the rear of the mandrel 1 in sequence, and the first lock nut 4 and the second lock nut are assembled. The tightening nut 5 is tightened on the third ring belt 14 by the rear part of the mandrel 1 in turn, the backing ring 8 and the back plate 3 are pressed on the shaft shoulder 15, and then the reflector 2 is inserted from the front part of the mandrel 1, Then fix the pressure plate 6 with the silica gel pad 7 on the threaded hole 1231 of the mandrel 1, and press the reflector 2 on the front surface of the backing ring 8 through the silica gel pad 7.

Claims (9)

1. Small-aperture reflector support structure, including mandrel (1), back plate (3) and pressing mechanism; The outer wall of the mandrel (1) is provided with a first annular zone (12), a second annular zone (13) and a third annular zone (14) with successively decreasing outer diameters from front to back, and a mirror (2 ) is set outside the first endless belt (12), the backboard (3) is set outside the second endless belt (13), and the pressing mechanism is arranged on the third endless belt (14); It is characterized in that it also includes a pressing plate (6), a silica gel pad (7) and a backing ring (8); A plurality of grooves (123) are evenly distributed on the edge of the front end surface of the mandrel (1), and the front end of the outer wall of the first annular zone (12) is provided with a section that contacts the inner wall of the through hole of the reflector (2). It is an arc-shaped annulus (124); There are multiple pressing plates (6), and each pressing plate (6) is fixed in a groove (123); Described silica gel pad (7) is a plurality of, and each silica gel pad (7) is fixed on the rear surface of a pressing plate (6) and is compressed on the front ring belt of reflector (2); The front surface of the backing ring (8) is evenly distributed on the circumference and is provided with a plurality of front bosses (81) that are in contact with the rear ring belt of the reflector (2), and any adjacent two front bosses (81) A convex arc band (82) which is connected with the front boss (81) and is of equal height is provided, and the convex arc band (82) is in contact with the shaft shoulder (15), and the outer circle diameter of the convex arc band (82) is smaller than the shaft shoulder ( 15) the diameter of the outer circle; The rear surface of the backing ring (8) is evenly distributed on the circumference and is provided with a plurality of rear bosses (83) that are in contact with the front surface of the back plate (3); A plurality of front bosses (81), a plurality of rear bosses (83) correspond to a plurality of pressure plates (6) in the circumferential direction of the mandrel (1); The pressing mechanism presses the backing ring (8) and the back plate (3) onto the shaft shoulder (15). 2. The support structure for small-diameter mirrors according to claim 1, characterized in that, the bottom of the groove (123) is provided with a plurality of threaded holes (1231), and the pressure plate (6) is fixed on the groove (123) by screws. )Inside. 3. The supporting structure of the small-aperture mirror according to claim 2, characterized in that there are three grooves (123), and two threaded holes (1231) are provided at the bottom of each groove (123). 4. small-aperture reflecting mirror supporting structure according to claim 1, is characterized in that, the front annular band of described reflecting mirror (2) is stepped, and is arranged on the through hole front end of reflecting mirror (2), described The rear annular band of the reflector (2) is arranged on the rear surface of the reflector (2). 5. The supporting structure of the small-aperture mirror according to claim 1, characterized in that, the outer edge of the pressing plate (6) is arc-shaped and the diameter of the outer edge is smaller than the outer diameter of the front annulus of the mirror (2) . 6. The supporting structure of the small-aperture mirror according to claim 1, characterized in that, a step is provided on the rear surface of the pressing plate (6), and a silicone pad (7) is fixed in the step. 7. The supporting structure of the small-aperture mirror according to claim 1, characterized in that, the central angle corresponding to the front boss (81) is 30°. 8. The support structure for small-diameter mirrors according to claim 1, characterized in that, the outer wall of the third annular band (14) is provided with external threads, and the pressing mechanism consists of the first locking nut (4) and The second lock nut (5) is composed of the first lock nut (4) and the second lock nut (5) which are sequentially screwed on the third ring belt (14) from front to back. 9. The supporting structure of the small-aperture mirror according to claim 1, characterized in that, the materials of the mandrel (1), the pressure plate (6) and the backing ring (8) are all made of materials with a coefficient of thermal expansion of 0.07E-6/ ℃ 4J32 Invar.