CN115903170B - Double-shaft flexible supporting structure of large-caliber strip-shaped reflecting mirror - Google Patents
Double-shaft flexible supporting structure of large-caliber strip-shaped reflecting mirror Download PDFInfo
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- CN115903170B CN115903170B CN202211531405.9A CN202211531405A CN115903170B CN 115903170 B CN115903170 B CN 115903170B CN 202211531405 A CN202211531405 A CN 202211531405A CN 115903170 B CN115903170 B CN 115903170B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a double-shaft flexible supporting structure of a large-caliber strip-shaped reflecting mirror, which is characterized in that a plurality of double-shaft flexible spring hinges are uniformly distributed in the inner circumference of a virtual section formed by an invar taper sleeve end of a double-shaft flexible supporting unit, and the double-shaft flexible supporting unit is provided with a horizontal flexible wire slot extending along the virtual section and used for communicating two adjacent double-shaft flexible spring hinges.
Description
Technical Field
The invention relates to the technical field of space optical remote sensing, in particular to a double-shaft flexible supporting structure of a large-caliber long-strip-shaped reflecting mirror.
Background
The space optical remote sensor is widely applied to the aspects of earth relief mapping, earth resource survey, outer space astronomical and planetary observation, national defense information census and the like as a precise optical remote sensing system. The reflector is used as a core component element of the space optical remote sensor, and the installation positioning precision and the supporting surface shape precision of the reflector have great influence on the imaging quality of an optical system. In order to reduce the weight of the reflector, reduce the carrying and transmitting costs and increase the first order natural frequency of the reflector, the primary mirror of the space optical remote sensor must be designed to be lightweight. However, the light weight design of the mirror can reduce the absolute rigidity of the mirror body, and the surface shape accuracy of the mirror surface can be reduced due to the influence of gravity release, thermal load and assembly stress. Therefore, the space reflector must have a supporting structure with good performance to reduce the deterioration of the surface shape precision of the reflector caused by the bad factors and improve the imaging quality of the space optical remote sensor.
Conventional circular mirror supports include perimeter supports, side supports, back center supports, back multipoint supports, and the like. If the periphery support is based on the back or outer edge of the reflector, the surface shape accuracy can be kept better when the periphery support is applied to the reflector, but the surface shape can be seriously deformed when the periphery support is used on a long reflector with a larger caliber. The side supports are commonly used flexible structures which are Bipod supports, the supports are flexible, the axial rigidity and the radial rigidity are high, but the side supports are required to be arranged on the side surfaces of the strip-shaped reflecting mirrors, so that the envelope size of the remote sensor is increased; the back-centered support is only suitable for small mirrors and foundation mirrors, and is not suitable for large-caliber elongated mirrors.
One Chinese patent with publication number of CN102902042A is named as a composite flexible supporting structure of a large-caliber reflector. Referring to fig. 1, the flexible supporting structure comprises a small bonding surface taper sleeve E for bonding with a reflector in a small area and a composite flexible supporting rod D connected with a reflector backboard; the small bonding surface taper sleeve E is connected with the composite flexible supporting rod D through a screw, the composite flexible supporting rod D is provided with an L-shaped groove and an annular groove two-layer flexible structure, 4L-shaped grooves are parallel along the peripheral line of the composite flexible supporting rod D, and the rear section forms an included angle of 60 degrees with the axis; the inner and outer annular grooves F, G are each composed of 4 segments of arc grooves uniformly distributed along the circumference and having the same width and radian. The flexible support effectively reduces the mirror deformation under the influence of gravity and thermal load, and meanwhile, the small bonding surface I ensures the mirror surface shape precision under the bonding residual stress. But has the following disadvantages: the L-shaped groove and the annular groove are not large enough in flexibility, and when the external stress such as the gravity, external vibration and thermal load of the large-caliber reflecting mirror is large, the flexible deformation generated is small, and a part of stress is possibly transmitted to the mirror body to generate serious mirror deformation; on the other hand, the bonding surface I is too small, and the bonding surface of the taper sleeve and the blind hole of the reflecting mirror, which is bonded, is adjusted and enlarged in consideration of the problems that the adhesive is possibly unevenly smeared and volatilized in space.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the double-shaft flexible supporting structure for the large-caliber long-strip-shaped reflecting mirror, which can solve the back supporting problem of the large-caliber long-strip-shaped reflecting mirror of the space optical remote sensor, eliminate the influence of assembly profit and gravity deformation generated in the assembling process of the reflecting mirror on the surface shape precision of the reflecting mirror surface, improve the temperature adaptability and reduce the influence of the positioning precision of the traditional supporting structure on the imaging quality.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention discloses a double-shaft flexible supporting structure of a large-caliber strip-shaped reflecting mirror, which comprises the following components:
the invar cone sleeve is sleeved on the upper part of the double-shaft flexible supporting unit and fixedly connected with the double-shaft flexible supporting unit;
the double-shaft flexible supporting unit is positioned at the invar taper sleeve end to form a virtual section perpendicular to the axis of the double-shaft flexible supporting unit;
the double-shaft flexible supporting unit is located a plurality of double-shaft flexible spring hinges are evenly distributed in the inner circumference of the virtual section, and the double-shaft flexible supporting unit is provided with a horizontal flexible wire slot extending along the virtual section and used for communicating two adjacent double-shaft flexible spring hinges.
Further, each biaxial flexible spring strap hinge comprises two flexible spring strap hinges, the two flexible spring strap hinges are crossed in parallel, and the intersection point is overlapped with the virtual section;
a gap is arranged between the opposite surfaces of two flexible sprung hinges in the same biaxial flexible sprung hinge.
Furthermore, the whole biaxial flexible supporting unit is of a cylindrical structure, and the invar taper sleeve sleeved on the upper part of the biaxial flexible supporting unit is of a cylindrical structure with an open lower end;
four biaxial flexible spring hinges are uniformly distributed in the circumferential direction of the biaxial flexible supporting unit;
the four double-shaft flexible spring belt hinges take the axis of the double-shaft flexible supporting unit as the center to sequentially form two flexible belt loops, and the inclination angles of the flexible spring belt hinges on the same flexible belt loop are the same.
Further, the horizontal flexible wire slot is close to one end of the double-shaft flexible spring belt hinge and is provided with a circular curved slot.
Further, the horizontal flexible wire chase is perpendicular to the biaxial flexible support unit axis.
Further, the dual-shaft flexible supporting structure is integrated in a reflector assembly of the large-caliber long-strip reflector, the reflector assembly comprises a reflector body and a substrate formed on the back of the reflector body, and the dual-shaft flexible supporting structure is assembled between the reflector body and the substrate.
Furthermore, three support blind holes are formed in the back surface of the reflector body, and each support blind hole is embedded with the double-shaft flexible support structure;
the lower end of the double-shaft flexible supporting unit is provided with a flange installation boss which is fixedly connected with the substrate through a fastening bolt;
the invar taper sleeve of the double-shaft flexible supporting structure is adhered in the supporting blind hole through epoxy resin, and the invar taper sleeve and the double-shaft flexible supporting unit are fastened through bolts and positioned through positioning pins.
Further, the upper end of the double-shaft flexible supporting unit is formed into a connecting end connected with the invar taper sleeve, a central hole is formed in the axis of the connecting end, pin holes are symmetrically formed in two sides of the central hole, and a plurality of bolt holes are uniformly distributed on the end face of the connecting end around the central hole;
holes corresponding to the pin holes and the bolt holes are formed in the invar taper sleeve;
the pin hole is used for penetrating the positioning pin;
and the double-shaft flexible supporting unit and the fastening bolt of the invar taper sleeve are assembled at the bolt hole.
Furthermore, the invar taper sleeve is provided with an adhesive surface I adhered and fixed with the support blind hole and a cylindrical surface formed at the top end of the invar taper sleeve;
the bonding surface I is a conical surface with the inclination of 1:18;
the invar taper sleeve is made of 4J36, and the thermal expansion coefficient of the invar taper sleeve is consistent with that of the reflector body.
Further, the material of the double-shaft flexible supporting unit is TC4, and the rough plating of the surface of the cutting part of the horizontal flexible wire groove of the double-shaft flexible supporting unit is better than 0.8.
In the technical scheme, the double-shaft flexible supporting structure of the large-caliber strip-shaped reflecting mirror has the beneficial effects that:
firstly, the invention discloses a double-shaft flexible supporting structure of a large-caliber strip-shaped reflecting mirror, which takes a three-point wheel double-shaft flexible supporting unit as a main stress-relieving component, and is assembled with bolts and positioning pins as main fastening and positioning components, so that the double-shaft flexible supporting unit, an invar taper sleeve, a reflecting mirror body and a substrate can form accurate positioning during installation;
in addition, the double-shaft flexible supporting unit is a double-shaft flexible spring belt hinge which is uniformly distributed along the circumference, the two inclined flexible spring belt hinges of the double-shaft flexible spring belt hinge are mutually angled, meanwhile, a horizontal flexible wire slot is formed between the adjacent double-shaft flexible spring belt hinges, and the horizontal flexible wire slot has flexibility of rotating around the center of the spring belt and simultaneously keeps larger off-axis rigidity. When the external load is applied to generate stress, the horizontal flexible wire slot deforms, absorbs strain energy, prevents the stress from being transferred to the mirror body of the mirror, ensures the surface shape precision of the mirror surface, reduces the stress concentration of the mirror under the action of gravity, and ensures that the surface shape precision of the mirror does not exceed the allowable value of optical design.
Finally, the three double-shaft flexible supporting units in the reflector assembly of the invention form complete kinematic constraint equivalent to three ball hinges on the reflector body without introducing over constraint, thereby realizing precise installation and positioning of the reflector body.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic view of a composite flexible support for a large caliber reflector of the prior art;
FIG. 2 is a front elevational view in full section of a dual-axis flexible support structure for a large caliber elongated reflector of the present disclosure;
FIG. 3 is an isometric view of a dual-axis support unit of a dual-axis flexible support structure for a large-caliber elongated reflector disclosed by the invention;
FIG. 4 is a front view of a dual-axis support unit of a dual-axis flexible support structure for a large-caliber elongated reflector disclosed in the present invention;
FIG. 5 is a cross-sectional view of a dual-axis support unit of a dual-axis flexible support structure for a large-caliber elongated reflector disclosed by the invention;
FIG. 6 is a cross-sectional view of a dual-axis flexible support structure for a large-caliber elongated reflector and reflector assembly according to the present disclosure;
FIG. 7 is an exploded view of a dual-axis flexible support structure for a large-caliber elongated reflector and the assembled state of the reflector body;
FIG. 8 is a cross-sectional view of another assembled state of a dual-axis flexible support structure for a large-caliber elongated mirror and a mirror body of the present invention.
Reference numerals illustrate:
1. a reflecting mirror body; 2. invar taper sleeve; 3. a biaxial flexible support unit; 5. double-shaft flexible spring belt hinge; 4. a substrate; 6. a horizontal flexible wire chase; 7. a circular curved groove; I. an adhesive surface;
a support blind hole 11;
flange mounting boss 31; pin holes 32; bolt holes 33;
51. a first flexible spring strap hinge; 52. a second flexible spring strap hinge; 53. a third flexible spring strap hinge; 54. a fourth flexible spring strap hinge; 55. a fifth flexible spring strap hinge; 56. a sixth flexible spring strap hinge; 57. a seventh flexible spring strap hinge; 58. and an eighth flexible spring belt hinge.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
Embodiment one;
see fig. 2;
the invention discloses a double-shaft flexible supporting structure of a large-caliber strip-shaped reflecting mirror, which comprises the following components:
the double-shaft flexible supporting unit 3 and the invar cone sleeve 2 are sleeved on the upper part of the double-shaft flexible supporting unit 3 and fixedly connected with the double-shaft flexible supporting unit 3;
the biaxial flexible supporting unit 3 is positioned at the end of the invar taper sleeve 2 and is provided with a virtual section perpendicular to the axis of the biaxial flexible supporting unit 3;
the double-shaft flexible supporting unit 3 is located in the virtual section, a plurality of double-shaft flexible spring hinges 5 are evenly distributed in the circumferential direction, and the double-shaft flexible supporting unit 3 is provided with a horizontal flexible wire slot 6 extending along the virtual section and used for communicating two adjacent double-shaft flexible spring hinges 5.
Specifically, the double-shaft flexible supporting structure in the structure takes the double-shaft flexible supporting unit 3 as a main body, and is matched with the double-shaft flexible supporting unit 3, a set of invar taper sleeve 2 arranged at the upper end of the double-shaft flexible supporting unit 3 is arranged, meanwhile, in order to be capable of well eliminating stress when external force is applied to the double-shaft flexible supporting structure, the double-shaft flexible supporting unit 3 is positioned at the invar taper sleeve 2 end, a virtual section perpendicular to the axis of the double-shaft flexible supporting unit 3 is formed, a plurality of double-shaft flexible spring belt hinges 5 and horizontal flexible wire slots 6 communicated with two adjacent double-shaft flexible spring belt hinges 5 are uniformly machined in the virtual section in the circumferential direction of the double-shaft flexible supporting unit 3, when the external force is applied, the force is transmitted to the positions of the double-shaft flexible spring belt hinges 5 and the horizontal flexible wire slots 6, and the stress can be eliminated through deformation of the horizontal flexible wire slots 6, so that the stress is prevented from being transmitted to a device matched with the double-shaft flexible supporting structure.
See fig. 2-5;
preferably, each biaxial flexible spring strap hinge 5 comprises two flexible spring strap hinges, the two flexible spring strap hinges are crossed in parallel, and the intersection point is coincident with the virtual section;
a gap is provided between the opposing surfaces of two of the same biaxial flexible sprung hinges 5.
Specifically, each double-shaft flexible spring belt hinge 5 comprises two flexible spring belt hinges, namely, the two flexible spring belt hinges form a double-shaft flexible spring belt hinge 5, the two flexible spring belt hinges are arranged in parallel and in a crossed mode, the crossing points are formed on the virtual section, opposite surfaces of the two flexible spring belt hinges are not contacted, gaps are formed, and mutual interference between the two flexible spring belt hinges when the two flexible spring belt hinges are deformed by external force is avoided through the gaps;
see fig. 2-5;
preferably, the whole biaxial flexible supporting unit 3 is of a cylindrical structure, and the invar taper sleeve 2 sleeved on the upper part of the biaxial flexible supporting unit 3 is of a cylindrical structure with an open lower end;
four biaxial flexible spring hinges 5 are uniformly distributed on the circumference of the biaxial flexible supporting unit 3;
the four double-shaft flexible spring belt hinges sequentially form two flexible belt loops by taking the axis of the double-shaft flexible supporting unit 3 as the center, and the inclination angles of the flexible spring belt hinges on the same flexible belt loop are the same.
Specifically, the structure is described in further detail with a cylindrical structure of the biaxial flexible supporting unit 3 as the most preferable example: firstly, the biaxial flexible supporting unit 3 is of a cylindrical structure, the invar taper sleeve 2 sleeved at the upper end of the biaxial flexible supporting unit is of a cylindrical structure matched with the cylindrical structure, meanwhile, four biaxial flexible spring band hinges 5 are arranged on the side wall of the top end of the biaxial flexible supporting unit 3 in the embodiment, the four biaxial flexible spring band hinges 5 are formed on the same virtual section and are uniformly distributed in the circumferential direction, and a horizontal flexible wire slot 6 is communicated between two adjacent biaxial flexible spring band hinges 5;
four biaxial flexible sprung hinges 5, each biaxial flexible sprung hinge 5 has two flexible sprung hinges, namely a first flexible sprung hinge 51 and a second flexible sprung hinge 52, a third flexible sprung hinge 53 and a fourth flexible sprung hinge 54, a fifth flexible sprung hinge 55 and a sixth flexible sprung hinge 56, a seventh flexible sprung hinge 507 and an eighth flexible sprung hinge 508, wherein the two flexible sprung hinges 5 of each biaxial flexible sprung hinge 5 are arranged in parallel and intersect, see fig. 5, a gap is formed between the two flexible sprung hinges, preferably, the eight flexible sprung hinges sequentially form two flexible sprung rings on the biaxial flexible support unit 3, and the flexible sprung hinges on the same flexible sprung ring have the same inclination angle, namely the first flexible sprung hinge 51, the third flexible sprung hinge 53, the fifth flexible sprung hinge 55, the seventh flexible sprung hinge 507 are one flexible sprung ring, the second flexible sprung hinge 52, the fourth flexible sprung hinge 54, the sixth flexible sprung hinge 508 are one flexible sprung ring;
preferably, the horizontal flexible wire slot 6 is formed with a circular curved slot 7 near the hinge end of the double-shaft flexible spring belt. Preferably, the horizontal flexible line slot 6 is perpendicular to the axis of the biaxial flexible support unit 3.
Each of the horizontal flexible wire chases 6 described in the above embodiments has a circular curved groove 7 near the biaxial flexible sprung hinge 5. The double-shaft flexible supporting unit 3 designed in the mode of the embodiment is matched with the invar taper sleeve 2 on the double-shaft flexible supporting unit, after the external mechanism is installed, acting force acting on the double-shaft flexible supporting unit can be greatly eliminated, stress is prevented from being transmitted to the external mechanism through deformation of the horizontal flexible wire slot 6, and the service life of the external mechanism is effectively prolonged.
Embodiment two;
see fig. 6-8;
the invention discloses a large-caliber strip-shaped reflecting mirror assembly, which comprises a reflecting mirror body 1 and a substrate 4 formed on the back surface of the reflecting mirror body 1, wherein a plurality of double-shaft flexible supporting structures (see the figures 2 to 5) are assembled between the reflecting mirror body 1 and the substrate 4;
by introducing the double-shaft flexible supporting structure in the first embodiment, the second embodiment takes the large-caliber strip-shaped reflecting mirror with the double-shaft flexible supporting structure as an example, and further describes the large-caliber strip-shaped reflecting mirror. Preferably, in the second embodiment, three support blind holes 11 are formed in the back surface of the reflector body 1, and each support blind hole 11 is embedded with the double-shaft flexible support structure;
the lower end of the double-shaft flexible supporting unit 3 is provided with a flange installation boss 31 fixedly connected with the base plate 4 through a fastening bolt, the invar steel taper sleeve 2 of the double-shaft flexible supporting structure is adhered in the supporting blind hole 11 through epoxy resin, and the invar steel taper sleeve 2 and the double-shaft flexible supporting unit 3 are fastened through bolts and positioned through positioning pins.
Firstly, the dual-shaft flexible support structure disclosed in the first embodiment is integrated in a large-caliber long strip-shaped reflector, a support blind hole 11 for embedding the flexible support structure is required to be formed on the back surface of the reflector body 1, and three support blind holes 11 are formed on the back surface of the reflector body 1 in the second embodiment, so as to form a three-point support structure; secondly, the structure of the reflector body 1 is combined, the above-mentioned dual-shaft flexible supporting structure is further required to have a connection part fixedly connected with the substrate 4 of the reflector body 1, so that the flange mounting boss 31 is designed at the connection part of the dual-shaft flexible supporting structure and the substrate 4, the diameter of the flange mounting boss 31 is required to be larger than that of the dual-shaft flexible supporting unit 3, and the flange mounting boss 31 and the substrate 4 of the embodiment are fastened by bolts, so that the assembly and the disassembly are convenient, and the stability is good.
In addition, in this embodiment, the invar taper sleeve 2 has an adhesion surface I adhered and fixed to the support blind hole 11, and a cylindrical surface formed at the top end of the invar taper sleeve 2; the bonding surface I is a conical surface with the inclination of 1:18;
the material model of the invar taper sleeve 2 is 4J36, and the thermal expansion coefficient of the invar taper sleeve 2 is consistent with that of the reflector body 1. The bonding surface I is bonded to the support blind hole 11 on the back surface of the mirror body 1 by epoxy resin, and glue should be uniformly applied during bonding, so as to ensure the consistency of the thickness of the glue and avoid the generation of bonding stress as much as possible, and the invar taper sleeve 2 needs to be fully aged and stabilized during manufacturing.
Preferably, the upper end of the biaxial flexible supporting unit 3 is formed into a connecting end connected with the invar taper sleeve 2, a central hole is formed in the axis of the connecting end, pin holes 32 are symmetrically formed in two sides of the central hole, and a plurality of bolt holes 33 are uniformly distributed on the end face of the connecting end around the central hole;
holes corresponding to the pin holes 32 and the bolt holes 33 are formed in the invar taper sleeve 2;
the pin holes 32 are used for penetrating the positioning pins;
fastening bolts of the biaxial flexible support unit 3 and the invar taper sleeve 2 are fitted at the bolt holes 33.
Because the second embodiment integrates the double-shaft flexible supporting structure into the large-caliber strip-shaped reflecting mirror component, accurate positioning and good stability after fastening are required to be ensured during installation; in order to meet this requirement, the present embodiment designs the pin holes 32 and the bolt holes 33, where the pin holes 32 are used to pass through positioning pins, and the positioning pins can ensure that the invar taper sleeve 2, the biaxial flexible supporting unit 3, and an external mechanism used in cooperation with the biaxial flexible supporting structure are positioned accurately, ensure that the stress transmitted in the later stage can act on the horizontal flexible wire slot 6 accurately, and eliminate the stress to the maximum extent. The bolt hole 33 is used for fastening the bolt, and will not be described in detail here.
Preferably, the material of the biaxial flexible supporting unit 3 is TC4, and the surface roughness plating of the cut portion of the horizontal flexible wire groove 6 of the biaxial flexible supporting unit 3 is better than 0.8.
The horizontal flexible wire groove 6 of this embodiment is manufactured by a machining method of "wire cutting and slow wire feeding", and the surface of the cutting part has the roughness requirement described above, and in addition, the whole biaxial flexible supporting unit 3 is fully vacuum aged and stabilized.
In combination with the second embodiment, when the biaxial flexible supporting structure in the first embodiment is assembled in the large caliber elongated strip-shaped reflecting mirror assembly, through design and practice, there are some preferred technical schemes:
the thickness of the double-shaft flexible spring belt hinge is generally 2mm or less and 4mm or less, the radius of the circular curved groove 7 is 10mm or less and r or less and 15mm or less, and the width of the horizontal flexible wire groove 6 is 2mm or less and b or less and 5mm or less.
In addition, all the bolts/screws for connection adopt GB/T70.1-2000 standard, the fastening bolts/screws of the invar taper sleeve 2 and the double-shaft flexible supporting unit 3 are hexagon socket head cap screws M5X16, and the locating pins on the fastening bolts/screws are locating pins with phi 3X16, and the locating pins are made of 30CrMnSi.
During assembly, each component part needs to be thoroughly cleaned, dust-free foreign matters are guaranteed, and the assembly is performed in a dust-free workshop during assembly, so that the assembly environment is guaranteed to be clean. Firstly, bonding a reflector body 1 and an invar taper sleeve 2, repairing and grinding the invar taper sleeve 2 and a support blind hole 11 of the corresponding reflector body 1, uniformly coating epoxy resin glue on a bonding surface I of the invar taper sleeve 2, fully contacting with the support blind hole 11 of the reflector body 1, and bonding and curing; the double-shaft flexible supporting unit 3 and the invar steel taper sleeve 2 are assembled, screws are adopted for gluing and fixing during assembly, pins are used for positioning at the same time, and then the bottoms of flange mounting bosses 31 of the assembled three double-shaft flexible supporting structures are integrally polished, so that coplanarity allowance values are ensured; finally, the substrate 4 and the biaxial flexible support structure are assembled: the base plate 4 is connected to the bottoms of the flange mounting bosses 31 of the three repaired biaxial flexible supporting structures through gluing by screws, and after the assembly, the next testing and assembling test is carried out.
The beneficial effects are that:
firstly, the invention discloses a double-shaft flexible supporting structure and a large-caliber long strip-shaped reflecting mirror assembly for eliminating stress by utilizing the flexible supporting structure, the large-caliber long strip-shaped reflecting mirror of the invention takes a three-point double-shaft flexible supporting unit 3 as a main stress eliminating component, and bolts and locating pins are used as main fastening and locating components when being assembled, so that the double-shaft flexible supporting unit 3, an invar steel taper sleeve 2, a reflecting mirror body 1 and a base plate 4 can form accurate positioning during installation;
in addition, the biaxial flexible supporting unit 3 is a biaxial flexible reed hinge 5 which is uniformly distributed along the circumference, the two oblique flexible reed hinges of the biaxial flexible reed hinge 5 are mutually angled, meanwhile, a horizontal flexible wire slot 6 is arranged between the adjacent biaxial flexible reed hinges 5, and the horizontal flexible wire slot 6 is formed by the flexibility of rotating around the center of the reed and simultaneously keeps larger off-axis rigidity. When the external load is applied to generate stress, the horizontal flexible wire slot 6 deforms, absorbs strain energy and prevents the stress from being transmitted to the reflector body 1, so that the surface shape accuracy of the reflector is ensured.
Finally, the three double-shaft flexible supporting units 3 in the reflector assembly form complete kinematic constraint equivalent to three ball hinges on the reflector body 1 without introducing over constraint, so that the precise installation and positioning of the reflector body 1 are realized.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (9)
1. A dual-axis flexible support structure for a large-caliber elongated reflector, comprising:
the device is characterized by comprising a double-shaft flexible supporting unit (3) and an invar taper sleeve (2) sleeved on the upper part of the double-shaft flexible supporting unit (3) and fixedly connected with the double-shaft flexible supporting unit (3);
the end of the double-shaft flexible supporting unit (3) positioned at the invar taper sleeve (2) is provided with a virtual section perpendicular to the axis of the double-shaft flexible supporting unit (3);
the double-shaft flexible supporting unit (3) is positioned in the virtual cross section, a plurality of double-shaft flexible spring belt hinges (5) are uniformly distributed in the circumferential direction, and the double-shaft flexible supporting unit (3) is provided with a horizontal flexible wire slot (6) extending along the virtual cross section and used for communicating two adjacent double-shaft flexible spring belt hinges (5);
each double-shaft flexible spring belt hinge (5) comprises two flexible spring belt hinges, the two flexible spring belt hinges are crossed in parallel, and the intersection point is coincident with the virtual section;
a gap is arranged between the opposite surfaces of two flexible sprung hinges (5) in the same biaxial flexible sprung hinge.
2. The dual-axis flexible support structure of a large-caliber strip-shaped reflecting mirror according to claim 1, wherein the dual-axis flexible support structure comprises a plurality of support plates;
the whole biaxial flexible supporting unit (3) is of a cylindrical structure, and the invar taper sleeve (2) sleeved on the upper part of the biaxial flexible supporting unit (3) is of a cylindrical structure with an open lower end;
four biaxial flexible spring hinges (5) are uniformly distributed in the circumferential direction of the biaxial flexible supporting unit (3);
four biax flexible spring area hinges (5) use biax flexible support unit (3) axis is two flexible area circles of formation in proper order as the center, same flexible area circle flexible spring area hinge inclination is the same.
3. The dual-axis flexible support structure of a large-caliber strip-shaped reflecting mirror according to claim 1, wherein the dual-axis flexible support structure comprises a plurality of support plates;
and one end of the horizontal flexible wire slot (6) close to the double-shaft flexible spring belt hinge (5) is provided with a circular curved slot (7).
4. A dual-axis flexible support structure for a large-caliber elongated reflector as recited in claim 3, wherein;
the horizontal flexible wire slot (6) is perpendicular to the axis of the biaxial flexible supporting unit (3).
5. A dual-axis flexible support structure for a large caliber elongated reflector according to any one of claims 1-4, wherein;
the double-shaft flexible supporting structure is integrated in a reflecting mirror assembly of a large-caliber long-strip-shaped reflecting mirror, the reflecting mirror assembly comprises a reflecting mirror body (1) and a substrate (4) formed on the back surface of the reflecting mirror body (1), and the double-shaft flexible supporting structure is assembled between the reflecting mirror body (1) and the substrate (4).
6. The dual-axis flexible support structure for a large-caliber elongated reflector of claim 5, wherein;
three support blind holes (11) are formed in the back of the reflector body (1), and each support blind hole (11) is embedded with the double-shaft flexible support structure;
the lower end of the double-shaft flexible supporting unit (3) is provided with a flange installation boss (31) fixedly connected with the base plate (4) through a fastening bolt;
the invar taper sleeve (2) of the double-shaft flexible supporting structure is adhered to the inside of the supporting blind hole (11) through epoxy resin, and the invar taper sleeve (2) and the double-shaft flexible supporting unit (3) are fastened through bolts and positioned through positioning pins.
7. The dual-axis flexible support structure of a large-caliber strip-shaped reflecting mirror as claimed in claim 6, wherein the support structure comprises a plurality of support plates;
the upper end of the double-shaft flexible supporting unit (3) is formed into a connecting end connected with the invar taper sleeve (2), a central hole is formed in the axis of the connecting end, pin holes (32) are symmetrically formed in two sides of the central hole, and a plurality of bolt holes (33) are uniformly distributed on the end face of the connecting end around the central hole;
holes corresponding to the pin holes (32) and the bolt holes (33) are formed in the invar taper sleeve (2);
the pin hole (32) is used for penetrating the positioning pin;
the double-shaft flexible supporting unit (3) and the fastening bolt of the invar taper sleeve (2) are assembled at the bolt hole (33).
8. The dual-axis flexible support structure of a large-caliber strip-shaped reflecting mirror as claimed in claim 6, wherein the support structure comprises a plurality of support plates;
the invar taper sleeve (2) is provided with an adhesive surface I adhered and fixed with the support blind hole (11) and a cylindrical surface formed at the top end of the invar taper sleeve (2);
the bonding surface I is a conical surface with the inclination of 1:18;
the invar taper sleeve (2) is made of 4J36, and the thermal expansion coefficient of the invar taper sleeve (2) is consistent with that of the reflecting mirror body (1).
9. The dual-axis flexible support structure for a large-caliber elongated reflector of claim 5, wherein;
the material of the double-shaft flexible supporting unit (3) is TC4, and the surface roughness of the cutting part of the horizontal flexible wire groove (6) of the double-shaft flexible supporting unit (3) is better than 0.8.
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| CN202211531405.9A CN115903170B (en) | 2022-12-01 | 2022-12-01 | Double-shaft flexible supporting structure of large-caliber strip-shaped reflecting mirror |
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| CN115903170B true CN115903170B (en) | 2024-01-26 |
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| CN116736476B (en) * | 2023-08-10 | 2023-10-27 | 中国科学院长春光学精密机械与物理研究所 | Large-caliber long strip-shaped reflecting mirror stress-free assembly structure |
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