CN111650716A - Surface-shaped high-stability reflector and assembling method thereof - Google Patents
Surface-shaped high-stability reflector and assembling method thereof Download PDFInfo
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- CN111650716A CN111650716A CN202010387133.4A CN202010387133A CN111650716A CN 111650716 A CN111650716 A CN 111650716A CN 202010387133 A CN202010387133 A CN 202010387133A CN 111650716 A CN111650716 A CN 111650716A
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003292 glue Substances 0.000 claims abstract description 26
- 239000011324 bead Substances 0.000 claims abstract description 15
- 239000011521 glass Substances 0.000 claims abstract description 15
- 229920006335 epoxy glue Polymers 0.000 claims abstract description 11
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 229910052738 indium Inorganic materials 0.000 claims description 3
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 14
- 239000012790 adhesive layer Substances 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/183—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors specially adapted for very large mirrors, e.g. for astronomy, or solar concentrators
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Astronomy & Astrophysics (AREA)
- Sustainable Development (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention discloses a surface-shaped high-stability reflector and an assembling method thereof, which overcome the difficulties of complex assembling and debugging processes of the traditional high-precision optical reflector and the problems that the surface shape of the reflector after assembling is easy to change. The mirror includes: reflector main part and flexible connection festival. The reflector main body is fixed in a center supporting mode, the inner wall of the back center supporting cylinder is in a conical design, and the reflector and the flexible connecting joint are bonded through epoxy glue with high strength. And the uniform glue layer is ensured by grinding and matching for multiple times and uniformly mixing micro glass beads with the same diameter as the determined glue layer thickness in the epoxy glue.
Description
Technical Field
The invention belongs to the technical field of space optical remote sensing, and particularly relates to a surface-shaped high-stability reflecting mirror and an assembling method thereof.
Background
High-precision optical equipment is applied more and more in the fields of aerospace, laser communication and the like, wherein the application of the SiC reflector is very common. At present, the SiC reflector in high-precision optical equipment is fixed by a plurality of methods such as central support, back multipoint support and the like. The insert is designed into a cylinder in the common center support, the insert and the gluing surface of the SiC reflector are cylindrical surfaces, and when the two cylindrical surfaces are matched, the gap is difficult to keep consistent, so that the thickness uniformity of the glued glue layer in the circumferential direction is difficult to guarantee, therefore, the assembling and debugging of the SiC reflector are difficult to increase by the cylindrical gluing surface, the surface shape change of the SiC reflector is easy to cause, and the installation and debugging of the whole optical system are influenced.
Disclosure of Invention
The invention aims to solve the problems that the existing SiC reflecting mirror is difficult to assemble and debug and the surface type of the SiC reflecting mirror is easy to change, and provides a surface-shaped high-stability reflecting mirror and an assembling method thereof.
The specific technical scheme of the invention is as follows:
the invention provides a surface-shaped high-stability reflector, which comprises a reflector main body and a flexible connecting joint, wherein the reflector main body is provided with a plurality of reflecting surfaces;
the back of the reflector main body is provided with a central supporting cylinder; the inner wall of the central supporting cylinder is conical;
the flexible connecting joint is positioned in the central supporting cylinder, is made of a material with the same thermal expansion coefficient as the reflector, and comprises an annular chassis and a plurality of flexible connecting arms; a plurality of flexible link arms evenly set up on annular chassis along the circumferencial direction, and flexible link arm comprises horizontal segment and vertical section, horizontal segment one end with annular chassis surface links firmly, and the other end links firmly with vertical section below, and the top of vertical section is equipped with the arch that is used for bonding with a center support section of thick bamboo inner wall, and all archs constitute the conical surface with the surface that a center support section of thick bamboo inner wall bonded jointly, and the tapering of this conical surface is the same with the tapering of a center support section of thick bamboo inner wall, is equipped with a plurality of first screw holes that are used for being connected with exterior structure along the circumferencial direction on the annular chassis.
Furthermore, the flexible connecting joint and the inner wall of the central supporting cylinder are bonded by epoxy glue mixed with micro glass beads, and the diameter of each micro glass bead is the same as the thickness of the adhesive layer.
Furthermore, a plurality of triangular lightening grooves are arranged on the periphery of the central supporting cylinder of the reflector body.
Furthermore, the reflector body is made of SiC, and the flexible connecting joint is made of indium steel.
Furthermore, the top surface of the connecting arm of the flexible connecting joint is provided with a second threaded hole for detachment and a groove for positioning, wherein the center line of at least one groove and the center of the first threaded hole are positioned on the same straight line.
Furthermore, the number of the flexible connecting arms is 6, and the 6 flexible connecting arms are uniformly distributed on the annular chassis.
Further, the diameter of the micro glass beads is 0.1 mm.
Further, the mirror body is elliptical.
Based on the above description of the structure of the reflector, a method for assembling the reflector will now be described:
step 1: according to the taper of the central support cylinder and the thickness of the required glue layer, acquiring a height difference a of the top surface of the flexible connection joint lower than the top surface of the central support cylinder after the flexible connection joint and the central support cylinder are ground and when the flexible connection joint is placed in the central support cylinder and glue is not coated;
the specific calculation formula of a is as follows:wherein H is the thickness of the glue layer, and β is the taper of the central support cylinder;
step 2: coating a proper amount of grinding paste on the inner wall of the central support cylinder and the outer surface of the bulge on the flexible connecting joint for relative grinding;
and step 3: placing the ground flexible connecting joint into a central supporting cylinder for measurement, taking out the flexible connecting joint when the height difference between the top surface of the flexible connecting joint and the top surface of the central supporting cylinder reaches a, and uniformly coating epoxy glue mixed with micro glass beads on the bonding surface of the connecting arm of the flexible connecting joint;
and 4, step 4: placing the flexible connecting joint into the central support cylinder and ensuring that the top surface of the flexible connecting joint is coplanar with the top surface of the central support cylinder;
and 5: and after the placement, curing the glue layer, and finishing the assembly of the reflector.
Further, when the reflector body is elliptical, step 4 is to straighten the silk thread in the long axis direction of the reflector body while ensuring that the top surface of the flexible connecting joint is coplanar with the top surface of the central support cylinder, and to make the silk thread pass through the groove on the top surface of the flexible connecting joint, so as to ensure that the center of the flexible connecting joint and the center of one threaded hole on the annular chassis are located on the long axis of the reflector body.
The invention has the beneficial effects that:
1. the inner wall of the central supporting cylinder of the reflector main body in the reflector provided by the invention is conical, and the flexible connecting joint and the central supporting cylinder adopt a cone-to-cone matching mode, so that the problem that the thickness uniformity of a bonded circumferential glue layer is difficult to ensure because the matching clearance between the reflector central support and the insert is difficult to keep consistent when the reflector central support and the insert are matched by adopting two cylindrical surfaces in the prior art is solved, and the assembling and adjusting precision of the reflector is improved.
2. The flexible connecting joint adopts a structure of a plurality of flexible connecting arms and an annular chassis, the flexible connecting arms are provided with a bulge for bonding, and the bonding design of the bulge can reduce the area of a rubber surface under the condition of ensuring the strength, thereby reducing the generated temperature change stress and reducing the influence on the surface shape of the reflector. In addition, the micro stress generated by the glue layer can be absorbed by the flexible connecting joint. Therefore, after the reflector provided by the invention is verified to realize tests such as random vibration (total root mean square acceleration of 18g), thermal cycle, thermal vacuum and the like, the surface shape data RMS of the reflector is basically stable at lambda/60 and is not changed.
3. The reflector main body and the flexible connecting joint are connected by epoxy glue with high strength, and a proper amount of micro glass beads with the diameter of 0.1mm are mixed in the epoxy glue, so that the thickness of a glue layer after the reflector main body and the flexible connecting joint are connected by the epoxy glue, the reflector main body and the flexible connecting joint are completely uniform and consistent, in addition, the expansion coefficient of the micro glass beads is close to the thermal expansion coefficient of the SiC reflector, and the stress generated after the glue layer is solidified can be ignored.
Drawings
Fig. 1 is a cross-sectional view of a reflector.
FIG. 2 is a schematic view of a rear structure of the reflector body.
Fig. 3 is a side view of the mirror body.
Fig. 4 is a front view of the flexible link.
FIG. 5 is a top view of a flexible link.
The reference numbers are as follows:
the reflector comprises a reflector body 1, a triangular weight reduction groove 12, a central support cylinder 13, a flexible connecting joint 2, an annular chassis 21, a flexible connecting arm 22, a groove 23, a first threaded hole 24, a boss 25, a second threaded hole 26 and a protrusion 27.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a specific structure of a surface-shaped high-stability mirror group, which includes a mirror body 1 and a flexible connecting joint 2, wherein the mirror body 1 (in the present embodiment, the material of the mirror is SiC) is set to be elliptical, and the mirror body may also be circular according to the actual application scenario.
As shown in fig. 2 and 3, a central support cylinder 13 is arranged on the back of the reflector body 1, the inner wall of the central support cylinder 13 is conical, and a plurality of triangular weight-reducing grooves 12 are arranged on the periphery of the central support cylinder 13 because triangular weight-reducing is most beneficial to maintaining the rigidity of the reflector.
As shown in fig. 3 and 4, the number of the flexible connection arms in this embodiment is 6, the flexible connection joint 2 includes an annular base plate 21 and a plurality of flexible connection arms 22, and this six-claw flexible structure design, the small stress generated by the glue layer after the glue joint is absorbed by the flexible joint, and has almost no influence on the reflector, because the material of the reflector main body is SiC, the flexible connection joint 2 is made of indium steel with the same thermal expansion coefficient as that of the reflector main body 1 (if the reflector main body is made of other materials, the flexible connection joint is made of materials with the same thermal expansion coefficient as that of the reflector main body). The 6 flexible connecting arms 22 are uniformly arranged on the outer edge of the annular chassis 21 along the circumferential direction, each flexible connecting arm 22 comprises a horizontal section and a vertical section, one end of the horizontal section is fixedly connected with the outer surface of the annular chassis 21, the other end of the horizontal section is fixedly connected with the lower part of the vertical section, a bulge 27 used for being bonded with the inner wall of the central supporting cylinder is arranged above the vertical section, the surfaces of all the bulges 27 bonded with the inner wall of the central supporting cylinder 13 form a conical surface together, and the conical degree of the conical surface is the same as that of the inner wall of the central supporting cylinder 13; it should be noted that: the specific thickness of the vertical section of the flexible connecting arm 22 is calculated from the specific weight of the reflector by finite element calculation; in this embodiment, the taper of the inner wall of the central support cylinder 13 is 5 °, so that the surfaces of all the protrusions bonded to the inner wall of the central support cylinder 13 together form a taper of 5 °, and the annular base plate 21 is provided with a plurality of first threaded holes 24 along the circumferential direction for connecting with external structures.
On the basis of the above structure, the following optimization design is made in the present embodiment:
1. in order to further ensure the thickness of the adhesive layer, in this embodiment, the flexible connecting joint 2 and the inner wall of the central support cylinder 13 are bonded by epoxy glue mixed with micro glass beads, and the diameter of the micro glass beads is the same as the thickness of the adhesive layer, and in this embodiment, the diameter of the micro glass beads is 0.1mm because the thickness of the adhesive layer needs 0.1 mm.
2. Because the shape of speculum main part 1 is oval, can accurate location when in order to install, all be provided with recess 23 at every flexible link arm 22 up end, align recess 23 and speculum main part 1's major axis during the bonding to satisfy the demand that can be fine when ensureing adapter ring and external equipment butt joint.
3. In addition, in order to facilitate the detachment of the flexible connecting joint 2, a second threaded hole 26 may be formed in the upper end surface of each flexible connecting arm 22.
Based on the structural description of the mirror assembly, the fitting process of the present embodiment will now be described:
step 1: before the reflector 1 is bonded with the flexible connecting joint 2, the height difference that the top surface of the flexible connecting joint 2 is lower than the top surface of the reflector central support cylinder 13 is a when the flexible connecting joint 2 is placed in the central support cylinder after the flexible connecting joint 2 and the central support cylinder 13 are ground and the glue is not coated, according to the taper of the central support cylinder 13 and the required thickness of the glue layer, the thickness of the glue layer after the glue is bonded is completely uniform. In this embodiment, since the taper β of the center support cylinder 13 is 5 ° and the glue layer thickness H is 0.1mm, through the formula:
Step 2: coating a proper amount of grinding paste on the inner wall of the central supporting cylinder 13 and the outer surface of the bulge 27 on the flexible connecting joint 2 for relative grinding;
and step 3: placing the ground flexible connecting joint 2 into a central support cylinder 13 for measurement, taking out the flexible connecting joint 2 until the height difference a between the top surface of the flexible connecting joint 2 and the top surface of the central support cylinder 13 is 2.3mm, wiping the inner wall of the central support cylinder 13 and the outer surface of the bulge 27 on the flexible connecting joint 2 completely, and uniformly coating epoxy glue mixed with 0.1mm micro glass beads on the outer surface of the bulge 27 on the flexible connecting joint 2;
and 4, step 4: finally, the flexible connecting joint 2 is placed in the central support cylinder 13, and the top surface of the flexible connecting joint 2 is ensured to be coplanar with the top surface of the central support cylinder 13, because the whole reflector in the embodiment is oval, the coplanar is ensured, and simultaneously, the silk thread needs to be straightened in the long axis direction of the reflector body 1, and passes through the groove 23 on the top surface of the flexible connecting arm 22, so as to ensure that the center of the flexible connecting joint 2 and the center of one first threaded hole 24 on the annular chassis 21 are positioned on the long axis of the reflector body 1, and ensure that the assembling requirements are met when the reflector is butted with external equipment;
and 5: and (5) erasing the redundant glue, and after the glue layer is solidified after the glue layer is placed, finishing the assembly of the reflector.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a high stable speculum of shape of face, includes the speculum main part, its characterized in that: the flexible connecting joint is also included;
the back of the reflector main body is provided with a central supporting cylinder; the inner wall of the central supporting cylinder is conical;
the flexible connecting joint is positioned in the central supporting cylinder, is made of a material with the same thermal expansion coefficient as the reflector main body, and comprises an annular chassis and a plurality of flexible connecting arms; a plurality of flexible link arms evenly set up on annular chassis along the circumferencial direction, and flexible link arm comprises horizontal segment and vertical section, horizontal segment one end with annular chassis surface links firmly, and the other end links firmly with vertical section below, and the top of vertical section is equipped with the arch that is used for bonding with a center support section of thick bamboo inner wall, and all archs constitute the conical surface with the surface that a center support section of thick bamboo inner wall bonded jointly, and the tapering of this conical surface is the same with the tapering of a center support section of thick bamboo inner wall, is equipped with a plurality of first screw holes that are used for being connected with exterior structure along the circumferencial direction on the annular chassis.
2. The surface-shaped highly stable reflector according to claim 1, characterized in that: the flexible connecting joint and the inner wall of the central supporting cylinder are bonded by epoxy glue mixed with micro glass beads, and the diameter of each micro glass bead is equal to the thickness of the bonding glue layer.
3. The surface-shaped highly stable reflector according to claim 2, characterized in that: the periphery of the central supporting cylinder of the reflector main body is provided with a plurality of triangular weight-reducing grooves.
4. The surface-shaped highly stable reflector according to claim 3, characterized in that: the reflector body is made of SiC, and the flexible connecting joint is made of indium steel.
5. The surface-shaped highly stable reflector according to claim 4, wherein: the top surface of the flexible connecting joint connecting arm is provided with a second threaded hole for detachment and a groove for positioning, wherein the center line of at least one groove and the center of the first threaded hole are positioned on the same straight line.
6. The surface-shaped highly stable reflector according to claim 5, characterized in that: the number of the flexible connecting arms is 6.
7. The surface-shaped highly stable reflector according to claim 6, characterized in that: the diameter of the micro glass beads is 0.1 mm.
8. The surface-shaped highly stable reflector according to claim 7, wherein: the reflector body is elliptical.
9. The assembling method of the surface-shaped high-stability reflector is characterized by comprising the following steps of:
step 1: according to the taper of the central support cylinder and the thickness of the required glue layer, acquiring a height difference a of the top surface of the flexible connection joint lower than the top surface of the central support cylinder after the flexible connection joint and the central support cylinder are ground and when the flexible connection joint is placed in the central support cylinder and glue is not coated;
the specific calculation formula of a is as follows:wherein H is the thickness of the glue layer, and β is the taper of the central support cylinder;
step 2: coating a proper amount of grinding paste on the inner wall of the central support cylinder and the outer surface of the bulge on the flexible connecting joint for relative grinding;
and step 3: placing the ground flexible connecting joint into a central supporting cylinder for measurement, taking out the flexible connecting joint when the height difference between the top surface of the flexible connecting joint and the top surface of the central supporting cylinder reaches a, and uniformly coating epoxy glue mixed with micro glass beads on the bonding surface of the connecting arm of the flexible connecting joint;
and 4, step 4: placing the flexible connecting joint into the central support cylinder and ensuring that the top surface of the flexible connecting joint is coplanar with the top surface of the central support cylinder;
and 5: and after the placement, curing the glue layer, and finishing the assembly of the reflector.
10. The assembling method of the surface-shaped high stable reflector according to claim 9, characterized in that: when the reflector main body is elliptical, step 4 ensures that the top surface of the flexible connecting joint and the top surface of the central supporting cylinder are coplanar, and simultaneously, the silk thread needs to be straightened in the long axis direction of the reflector main body and passes through the groove on the top surface of the flexible connecting joint so as to ensure that the center of the flexible connecting joint and the center of one threaded hole on the annular chassis are positioned on the long axis of the reflector main body.
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CN112882185A (en) * | 2021-01-22 | 2021-06-01 | 西安应用光学研究所 | Glue joint fixing structure and fixing method suitable for adjustable lens group of reflecting system |
CN113031200A (en) * | 2021-03-10 | 2021-06-25 | 中国科学院长春光学精密机械与物理研究所 | Method and structure for connecting main reflector and metal support in astronomical telescope |
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