CN109932804B - Flexible memory alloy supporting device of small-caliber light reflector - Google Patents
Flexible memory alloy supporting device of small-caliber light reflector Download PDFInfo
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- CN109932804B CN109932804B CN201910160482.XA CN201910160482A CN109932804B CN 109932804 B CN109932804 B CN 109932804B CN 201910160482 A CN201910160482 A CN 201910160482A CN 109932804 B CN109932804 B CN 109932804B
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- 229910001285 shape-memory alloy Inorganic materials 0.000 title claims abstract description 82
- 239000013585 weight reducing agent Substances 0.000 claims description 24
- 230000007704 transition Effects 0.000 claims description 15
- 229910001374 Invar Inorganic materials 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229910010380 TiNi Inorganic materials 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 239000004918 carbon fiber reinforced polymer Substances 0.000 claims description 2
- 230000035882 stress Effects 0.000 description 20
- 239000000463 material Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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Abstract
The invention discloses a flexible memory alloy supporting device of a small-caliber light reflector. The existing reflector supporting mode is difficult to simultaneously ensure the surface shape precision and the assembly requirement of the reflector under the working conditions of self weight, temperature change and the like. The invention is provided with a boss on a support base, and a flexible support unit and a memory alloy fine adjustment unit are arranged on the boss; wire connectors are fixed at two ends of the memory alloy wire of the memory alloy fine adjustment unit; the pressure sensors of all the memory alloy fine adjustment units transmit detected pressure signals to the computer, and the magnitude of the current passing through the wire connectors of all the memory alloy fine adjustment units is controlled by the computer. The invention controls the current passing through each wire joint to heat and deform the memory alloy wires at different supporting points through the computer respectively, and controls the micro-deformation variable of the memory alloy wires, thereby controlling the pressure value of each supporting point and effectively coordinating the influence of the mirror surface shape precision.
Description
Technical Field
The invention belongs to the field of space optical reflector imaging, and particularly relates to a flexible memory alloy supporting device of a small-caliber light reflector.
Background
With the continuous development and innovation of science, the precision requirement of the detection of the reflector is continuously improved, the optical reflector is widely used, and the precision requirement of the small reflector is required to be improved. The diameter and weight of the main reflector, which is the most important optical component in the photoelectric detection device, are affected more and more seriously by dead weight, thermal deformation and the like on the surface shape precision of the reflector, so that the imaging quality of the space remote sensor is reduced.
The small-caliber space optical reflector is generally formed by a reflector component formed by a support structure and then is installed on a main structure of a space remote sensor. Therefore, factors influencing the surface shape precision of the primary mirror play a decisive role in the quality of the primary mirror supporting structure besides the processing error, the self weight and the thermal deformation of the primary mirror surface. Therefore, the supporting structure must have good static and dynamic structural rigidity to meet the requirement of the reflecting mirror for supporting stability. Meanwhile, the supporting structure has certain flexibility and variability so as to enhance the thermal stability of the reflector and reduce the assembling stress, thereby reducing the influence of various complex environmental factors such as gravity, external load, temperature change, vibration and the like on the shape accuracy of the reflector.
Disclosure of Invention
The invention provides a flexible memory alloy supporting device of a small-caliber light reflector, which aims to solve the problem that the prior art is difficult to simultaneously ensure high surface precision and high assembly process requirements of the reflector under the working conditions of dead weight, temperature change and the like.
The technical scheme adopted by the invention is as follows:
the device comprises a flexible supporting unit, a pressure sensor, a memory alloy fine-tuning unit, a supporting base, a fixing unit and a computer. N weight-reducing groove groups are uniformly distributed on the end face of the supporting base in a concentric circle shape, wherein n is more than or equal to 5; the weight reduction groove group comprises k weight reduction grooves which are uniformly distributed along the circumferential direction, and k is more than or equal to 6; the weight reduction grooves of the innermost weight reduction groove group are fan-shaped, and the weight reduction grooves of the other weight reduction groove groups are fan-shaped; transition fillets I are arranged at the joints of two radiuses of the fan-shaped lightening grooves and the joints of the radiuses and the circular arcs; the weight reduction groove centers of the weight reduction groove groups are aligned one by one in the circumferential position; the central angles of all the weight-reducing slots are equal; n +1 circular plates and n spoke groups which are uniformly distributed in a concentric circle shape are formed on the supporting base provided with the n weight-reducing groove groups; every two adjacent circular plates are connected through a spoke plate group; the spoke plate group comprises k spoke plates which are uniformly distributed along the circumferential direction; a first boss group, n-1 second boss groups and a third boss group which are integrally formed are arranged on one end face of the supporting base; except the first and nth circular plates at the innermost sides, the other circular plates are respectively provided with a second boss group; the first boss group and the third boss group are both arranged on the nth circular plate; the first and second innermost boss groups each comprise k second bosses which are arranged on the circular plate and are positioned at the intersection positions of the circular plate and each spoke plate; the ith second boss group comprises k second bosses which are arranged on the circular plate and are positioned at the intersection positions of the circular plate and each radials, and also comprises (i-2) xk fourth bosses which are arranged on the circular plate, wherein (i-2) fourth bosses are arranged between every two adjacent second bosses, all the bosses of the ith second boss group are uniformly distributed along the circumferential direction, and i sequentially takes the value of 3, … and n-1; the first boss group comprises three first bosses uniformly distributed along the circumference, the third boss group comprises k-3 third bosses, and the three first bosses and the k-3 third bosses are all arranged on the circular plate and are respectively positioned at the intersection positions of the circular plate and each radials; n-4 fifth bosses are arranged on the circular plate between each first boss and the third bosses on the two sides; the arc length of each fifth boss is equal to that of the arc between the first boss and the third boss on the two sides; a circular plate is provided with (n-3) xk sixth bosses between every two adjacent third bosses; arc lengths between two adjacent sixth bosses on the (n-1) th circular plate and between the sixth bosses and the third bosses are equal. Each first boss is provided with a flexible supporting unit, and each second boss, each third boss, each fourth boss, each fifth boss and each sixth boss are provided with a memory alloy fine-adjustment unit.
The flexible supporting unit comprises a bottom supporting plate I, a flexible supporting block I and a top plate supporting plate I which are coaxially arranged; one end of the first flexible supporting block is fixed with the first bottom supporting plate, and the other end of the first flexible supporting block is fixed with the first top plate supporting plate; a transition fillet II is arranged at the joint of the first flexible supporting block and the first top plate, and a transition fillet III is arranged at the joint of the first flexible supporting block and the first bottom plate; the lateral part of the top plate supporting plate I is provided with six weight reducing grooves I which are uniformly distributed along the circumference; six threaded holes uniformly distributed along the circumference and three weight reducing grooves two uniformly distributed along the circumference are formed in the end face of the bottom supporting plate I, and the weight reducing grooves two are located on the inner side of the threaded holes. And each threaded hole of the first bottom supporting plate is fixedly connected with the corresponding connecting through hole on the first boss through a fixing unit.
The memory alloy fine adjustment unit comprises a memory alloy wire, a bottom support plate II, a flexible support block II and a top plate support plate II which are coaxially arranged; one end of the second flexible supporting block is fixed with the second bottom supporting plate, and the other end of the second flexible supporting block is fixed with the second top plate supporting plate; six weight-reducing grooves I which are uniformly distributed along the circumference are formed in the two side parts of the top plate supporting plate; the three memory alloy wires are uniformly distributed along the circumferential direction, and two ends of each memory alloy wire are respectively connected with the second bottom supporting plate and the second top supporting plate through the first screws; wire connectors are fixed at two ends of the memory alloy wire; a pressure sensor is arranged in each of the three weight-reducing grooves I corresponding to the circumferential positions of the three memory alloy wires; the second bottom support plate is adhered to the second boss, the third boss, the fourth boss, the fifth boss or the sixth boss.
The pressure sensors of all the memory alloy fine adjustment units transmit detected pressure signals to the computer, and the magnitude of the current passing through the wire connectors of all the memory alloy fine adjustment units is controlled by the computer.
The fixing unit comprises a second screw, a spherical washer, a conical washer, a shaft sleeve and a spring washer; the shaft sleeve is fixedly sleeved in the connecting through hole of the first boss, and the spring washer is arranged between the first boss and the first bottom supporting plate; the spherical washer and the conical washer are both arranged on the back surface of the supporting base, and the conical washer is arranged between the spherical washer and the supporting base; the conical surface of the conical washer is contacted with the spherical surface of the spherical washer; and the second screw penetrates through the spherical washer, the conical washer, the shaft sleeve and the spring washer in sequence and is connected with the threaded hole of the first bottom support plate.
The cementing surfaces of the first bottom supporting plate, the second bottom supporting plate and the second top supporting plate are provided with flow guide grooves, so that the uniform diffusion of the cementing glue is facilitated, uniform glue spots are formed, the surface shape precision is improved, and the influence of the cementing agent and the residual stress of the cementing on the surface shape of the mirror surface is avoided to the maximum extent.
And stress relief grooves are formed in the first bottom supporting plate and the second bottom supporting plate, so that thermal stress between the reflector and the flexible supporting unit is relieved.
The model of the pressure sensor is HX 711.
The pressure sensor is connected with the computer by a data line.
The support base, the first flexible support block and the second flexible support block are made of invar steel, the first top support plate, the second top support plate, the first bottom support plate and the second bottom support plate are made of CFRP, the memory alloy wire is made of TiNi, and the first screw and the second screw are made of TB 3.
The shaft sleeve is provided with a stress relief groove, so that the assembly stress between the second screw and the shaft sleeve is reduced, and the adverse effect on the reflector is avoided.
And the bottom surface of the first bottom supporting plate, the top surface of the first boss, the circumferential surface of the first top supporting plate and the two end surfaces of the spring washer are respectively ground, and the contact surfaces of mutually contacted parts are subjected to lapping processing.
The assembly process is as follows:
1. and respectively grinding the wall of the supporting hole of the reflector, the bottom surface of the bottom supporting plate, the top surface of the first boss, the circumferential surface of the top plate supporting plate and two end surfaces of the spring washer.
2. And respectively gluing the top plate supporting plates I of the three flexible supporting units into the corresponding supporting holes of the reflector.
3. A bottom surface of the bottom support plate and a top surface of the first boss are lapped.
4. Firstly, fixing a memory alloy wire between a bottom supporting plate II and a top plate supporting plate II, and fixing a wire connector on the memory alloy wire to form a memory alloy fine adjustment unit; and then, the bottom supporting plate of each memory alloy fine adjustment unit is adhered to the back of the reflector through an adhesive, and the top supporting plate of each memory alloy fine adjustment unit is adhered to each second boss, each third boss, each fourth boss, each fifth boss and each sixth boss of the supporting base through an adhesive.
5. And connecting each pressure sensor with a computer through a data line.
6. And fixedly connecting each threaded hole of the first bottom supporting plate with the corresponding connecting through hole on the first boss through a fixing unit.
The invention has the beneficial effects that:
1. the memory alloy fine adjustment unit has the same flexibility along any direction, each pressure sensor transmits the pressure value of each supporting point to the computer in real time, the computer integrally compares the built-in database, the magnitude of current passing through each wire joint is respectively controlled to carry out heating deformation on the memory alloy wires of different supporting points, the micro-deformation variable of the memory alloy wires is controlled, automatic intelligent detection and adjustment are realized, the pressure value of each supporting point is controlled to balance the pressure of the supporting device, and the influences of self weight, temperature, external load, assembly stress and the like on the surface shape precision of the mirror surface are effectively coordinated. The real-time monitoring and adjustment of the computer and the pressure sensor realize an intelligent effect.
2. A flexible supporting block of the flexible supporting unit is made of invar steel, and the linear expansion coefficient of the invar steel is matched with that of the reflector material, so that the influence of the flexible supporting part on the surface shape precision of the reflector is reduced as much as possible.
3. The first top supporting plate of the flexible supporting unit is cemented with the reflector, the problems that the mass is large, the assembly difficulty is large, the surface shape precision of the reflector is easy to deteriorate and the like are solved by adopting bonding, and the integral structure of the reflector supporting device is simplified.
4. Stress concentration is effectively avoided by the first transition round angle, the second transition round angle and the third transition round angle. Stress relief grooves are formed in the first bottom supporting plate and the second bottom supporting plate, and the influence of thermal deformation and assembly stress on the reflector surface type is reduced. The bottom supporting plate I, the top plate supporting plate I and the top plate supporting plate II are provided with lightening grooves, so that the weight of the whole device is lightened, and the influence of stress generated by temperature change between the reflector and the top supporting plate on the precision of the reflector is released.
5. The flexible supporting block I and the flexible supporting block II both adopt cylindrical straight round double-shaft flexible hinge structures, the problems that flexible rotation center positions in different directions are different and processing is difficult and the like due to the fact that single-shaft flexible hinges can only be elastically bent along one direction and multi-cutting grooves of rigid structures are easily formed are solved, the cylindrical straight round double-shaft flexible hinges have the same flexible path along any direction, the highest sensitivity and the easiness in processing are realized in all directions, the reflector is guaranteed to be changed in the working direction, the working environment temperature changes, and the surface shape precision of the reflector is kept stable in an allowable range when assembly errors exist.
6. The supporting base is connected with the flexible supporting unit through the fixing unit, the fixing unit comprises a spherical washer and a conical washer, the automatic leveling of the contact surface can be realized, and the influence of assembly stress on the precision of the reflector due to the unevenness of the contact surface is reduced. The fixing unit further comprises a shaft sleeve, wherein an open slot is formed in the shaft sleeve, and assembling stress is eliminated. The fixing unit further comprises a spring washer, and due to stress generated by different thermal expansion coefficients of the supporting base, the first bottom plate supporting plate and the second bottom plate supporting plate, thermal stress and assembly stress can be eliminated through deformation of the spring washer, so that influence on imaging quality of the reflector is avoided.
7. The stress relief groove is formed in the shaft sleeve, so that the assembly stress between the second screw and the shaft sleeve is reduced, and the adverse effect on the reflector is avoided.
8. The boss structure on the supporting base is assembled with the flexible supporting unit and the memory alloy fine adjustment unit, so that the processing difficulty is reduced, and the assembling stress is reduced.
9. The reflecting mirror is made of a reaction sintered SIC material, and the deformation of the reaction sintered SIC material along with the temperature change is extremely small, so that the influence of the ambient temperature on the surface shape precision of the mirror surface is reduced.
Drawings
FIG. 1 is a schematic view of a mirror mounted on the present invention;
FIG. 2 is a perspective view of the overall structure of the present invention;
FIG. 3 is a perspective view of the support base of the present invention;
FIG. 4 is a perspective view of the structure of the flexible support unit of the present invention;
FIG. 5 is a perspective view of the memory alloy trimming unit according to the present invention;
FIG. 6 is a schematic view showing the assembly of the wire terminal of the present invention on the memory alloy wire;
FIG. 7 is a sectional view showing the structure of a fixing unit according to the present invention;
in the figure: 1. the device comprises a reflector, 2, a flexible supporting unit, 3, a supporting hole, 4, a supporting base, 5, a fixing unit, 6, a spring washer, 7-1, a first bottom supporting plate, 7-2, a second bottom supporting plate, 8, a pressure sensor, 9, a first boss, 10-1, a first flexible supporting block, 10-2, a second flexible supporting block, 11-1, a first top supporting plate, 11-2, a second top supporting plate, 12, a threaded hole, 13, a second lightening groove, 14, a second transition fillet, 15, a third transition fillet, 16, a second screw, 17, a spherical washer, 18, a conical washer, 19, a shaft sleeve, 20, a first transition fillet, 21, a first screw, 22, a memory alloy fine adjusting unit, 23, a first lightening groove, 24, a memory alloy wire, 25, a connecting through hole, 26 and a wire connector.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, 2 and 3, the flexible memory alloy supporting device for the small-caliber light reflector comprises a flexible supporting unit 2, a pressure sensor 8, a memory alloy fine-tuning unit 22, a supporting base 4, a fixing unit 5 and a computer. N weight-reducing groove groups are uniformly distributed on the end face of the supporting base 4 in a concentric circle shape, wherein n is more than or equal to 5; the weight reduction groove group comprises k weight reduction grooves which are uniformly distributed along the circumferential direction, and k is more than or equal to 6; the weight reduction grooves of the innermost weight reduction groove group are fan-shaped, and the weight reduction grooves of the other weight reduction groove groups are fan-shaped; transition fillets I20 are arranged at the joints of the two radiuses of the fan-shaped lightening grooves and the joints of the radiuses and the circular arcs; the weight reduction groove centers of the weight reduction groove groups are aligned one by one in the circumferential position; the central angles of all the weight-reducing slots are equal; n +1 circular plates and n spoke groups which are uniformly distributed in a concentric circle shape are formed on the supporting base 4 provided with the n weight-reducing groove groups; every two adjacent circular plates are connected through a spoke plate group; the spoke plate group comprises k spoke plates which are uniformly distributed along the circumferential direction; a first boss group, n-1 second boss groups and a third boss group which are integrally formed are arranged on one end face of the supporting base 4; except the first and nth circular plates at the innermost sides, the other circular plates are respectively provided with a second boss group; the first boss group and the third boss group are both arranged on the nth circular plate; the first and second innermost boss groups each comprise k second bosses which are arranged on the circular plate and are positioned at the intersection positions of the circular plate and each spoke plate; the ith second boss group comprises k second bosses which are arranged on the circular plate and are positioned at the intersection positions of the circular plate and each radials, and also comprises (i-2) xk fourth bosses which are arranged on the circular plate, wherein (i-2) fourth bosses are arranged between every two adjacent second bosses, all the bosses of the ith second boss group are uniformly distributed along the circumferential direction, and i sequentially takes the value of 3, … and n-1; the first boss group comprises three first bosses 9 uniformly distributed along the circumference, the third boss group comprises k-3 third bosses, and the three first bosses and the k-3 third bosses are all arranged on the circular plate and are respectively positioned at the intersection positions of the circular plate and each radial plate; n-4 fifth bosses are arranged on the circular plate between each first boss and the third bosses on the two sides; the arc length of each fifth boss is equal to that of the arc between the first boss and the third boss on the two sides; a circular plate is provided with (n-3) xk sixth bosses between every two adjacent third bosses; arc lengths between two adjacent sixth bosses on the (n-1) th circular plate and between the sixth bosses and the third bosses are equal. Each first boss is provided with a flexible supporting unit 2, and each second boss, third boss, fourth boss, fifth boss and sixth boss is provided with a memory alloy fine adjustment unit 22.
As shown in FIG. 4, the flexible supporting unit 2 comprises a bottom supporting plate I7-1, a flexible supporting block I10-1 and a top supporting plate I11-1 which are coaxially arranged; one end of the flexible supporting block I10-1 is fixed with the bottom supporting plate I7-1, and the other end of the flexible supporting block I10-1 is fixed with the top plate supporting plate I11-1; a transition fillet II 14 is arranged at the joint of the flexible supporting block I10-1 and the top plate supporting plate I11-1, and a transition fillet III 15 is arranged at the joint of the flexible supporting block I10-1 and the bottom supporting plate I7-1; six weight-reducing grooves I23 which are uniformly distributed along the circumference are formed in the side part of the top plate supporting plate I11-1; six threaded holes 12 uniformly distributed along the circumference and three weight-reducing grooves 13 uniformly distributed along the circumference are formed in the end face of the first bottom supporting plate 7-1, and the weight-reducing grooves 13 are located on the inner side of the threaded holes 12. And each threaded hole of the first bottom support plate 7-1 is fixedly connected with the corresponding connecting through hole 25 on the first boss through the fixing unit 5.
As shown in fig. 5 and 6, the memory alloy fine adjustment unit 22 comprises a memory alloy wire 24, and a bottom support plate two 7-2, a flexible support block two 10-2 and a top support plate two 11-2 which are coaxially arranged; one end of the second flexible supporting block 10-2 is fixed with the second bottom supporting plate 7-2, and the other end of the second flexible supporting block is fixed with the second top supporting plate 11-2; six weight-reducing grooves I23 which are uniformly distributed along the circumference are formed in the side part of the top plate supporting plate II 11-2; the three memory alloy wires 24 are uniformly distributed along the circumferential direction, and two ends of each memory alloy wire 24 are respectively connected with the bottom supporting plate II 7-2 and the top plate supporting plate II 11-2 through screws I21; wire connectors 26 are fixed at both ends of the memory alloy wire 24; a pressure sensor 8 is respectively arranged in three weight-reducing grooves I corresponding to the circumferential positions of the three memory alloy wires 24; the second bottom support plate 7-2 is adhered to the second, third, fourth, fifth or sixth boss.
The pressure sensors 8 of all the memory alloy fine adjustment units 22 output detected pressure signals to a computer, and the magnitude of the current passing through the wire connectors 26 of all the memory alloy fine adjustment units 22 is controlled by the computer.
As shown in fig. 7, the fixing unit 5 comprises a second screw 16, a spherical washer 17, a conical washer 18, a bushing 19 and a spring washer 6; the shaft sleeve 19 is fixedly sleeved in the connecting through hole 25 of the first boss, and the spring washer 6 is arranged between the first boss and the bottom support plate I7-1; the spherical washer 17 and the conical washer 18 are both arranged on the back surface of the support base 4, and the conical washer 18 is arranged between the spherical washer 17 and the support base 4; the conical surface of the conical washer 18 is contacted with the spherical surface of the spherical washer 17; the spherical washer and the conical washer realize the automatic leveling of the contact surface and also avoid the internal stress generated after locking due to the uneven joint surface; the second screw 16 penetrates through the spherical washer 17, the conical washer 18, the shaft sleeve 19 and the spring washer 6 in sequence and is connected with a threaded hole of the first bottom support plate 7-1. Stress generated between the first boss and the first bottom supporting plate 7-1 due to different materials can be eliminated through displacement of the spring washer, and the influence on the surface shape precision of the mirror surface is reduced.
The material of the reflector 1 is reaction sintered SIC; the back of the reflector 1 is provided with three support holes 3 which are uniformly distributed along the circumferential direction, and the three support holes 3 and three first bosses of the support base 4 are respectively and coaxially arranged; the top plate supporting plate I11-1 of the three flexible supporting units 2 is respectively adhered to the three supporting holes 3. The clearance between the circumferential surface of the first top plate supporting plate and the supporting hole is 0.1-0.3 mm, so that the influence on the surface shape precision of the reflector caused by different expansion and contraction between the first top plate supporting plate and the supporting hole is avoided.
The wall of a supporting hole of a reflector 1, the bottom surface (the contact surface with a first boss) of a bottom supporting plate I7-1, the top surface of the first boss, the circumferential surface of a top plate supporting plate I11-1 and two end surfaces of a spring washer 6 are respectively ground, and the contact surfaces of mutually contacted parts are ground.
The memory alloy fine adjustment unit 22 has the same flexibility along any direction, each pressure sensor transmits the pressure value of each supporting point to the computer in real time, the computer integrally compares with a built-in database, the magnitude of current passing through each wire joint 26 is respectively controlled to heat and deform the memory alloy wires of different supporting points, the micro-deformation variable of the memory alloy wires is controlled, automatic intelligent detection and adjustment are realized, the pressure value of each supporting point is controlled, the pressure of the supporting device is balanced, and the influence of temperature change and assembly stress of the supporting base on the mirror surface precision of the reflector is reduced.
The assembly process of the invention is as follows:
1. and respectively grinding the wall of the supporting hole of the reflector 1, the bottom surface of the bottom supporting plate I7-1, the top surface of the first boss, the circumferential surface of the top plate supporting plate I11-1 and two end surfaces of the spring washer 6.
2. The top plate supporting plates one 11-1 of the three flexible supporting units 2 are respectively glued into the corresponding supporting holes 3 of the reflector 1.
3. And (4) carrying out lap grinding on the bottom surface of the first bottom support plate (7-1) and the top surface of the first boss until the flatness of the bottom surface of the first bottom support plate (7-1) and the top surface of the first boss meets the required requirement.
4. Firstly, fixing a memory alloy wire between a bottom supporting plate II 7-2 and a top plate supporting plate II 11-2, and fixing a wire connector on the memory alloy wire to form a memory alloy fine adjustment unit; and then, the bottom support plate II 7-2 of each memory alloy fine adjustment unit is adhered to the back surface of the reflector through glue, and the top support plate II 11-2 of each memory alloy fine adjustment unit is adhered to each second boss, each third boss, each fourth boss, each fifth boss and each sixth boss of the support base through glue.
5. And connecting each pressure sensor with a computer through a data line.
6. And fixedly connecting each threaded hole of the first bottom support plate 7-1 with the corresponding connecting through hole 25 on the first boss through the fixing unit 5.
Claims (10)
1. The utility model provides a flexible memory alloy strutting arrangement of light-duty speculum of small-bore, includes pressure sensor, supports base, fixed unit and computer, its characterized in that: the memory alloy micro-adjustment device also comprises a flexible supporting unit and a memory alloy micro-adjustment unit; n weight-reducing groove groups are uniformly distributed on the end face of the supporting base in a concentric circle shape, wherein n is more than or equal to 5; the weight reduction groove group comprises k weight reduction grooves which are uniformly distributed along the circumferential direction, and k is more than or equal to 6; the weight reduction grooves of the innermost weight reduction groove group are fan-shaped, and the weight reduction grooves of the other weight reduction groove groups are fan-shaped; transition fillets I are arranged at the joints of two radiuses of the fan-shaped lightening grooves and the joints of the radiuses and the circular arcs; the weight reduction groove centers of the weight reduction groove groups are aligned one by one in the circumferential position; the central angles of all the weight-reducing slots are equal; n +1 circular plates and n spoke groups which are uniformly distributed in a concentric circle shape are formed on the supporting base provided with the n weight-reducing groove groups; every two adjacent circular plates are connected through a spoke plate group; the spoke plate group comprises k spoke plates which are uniformly distributed along the circumferential direction; a first boss group, n-1 second boss groups and a third boss group which are integrally formed are arranged on one end face of the supporting base; except the first and the (n-1) th round plates at the innermost sides, the other round plates are respectively provided with a second boss group; the first boss group and the third boss group are both arranged on the (n-1) th circular plate; the first and second innermost boss groups each comprise k second bosses which are arranged on the circular plate and are positioned at the intersection positions of the circular plate and each spoke plate; the ith second boss group comprises k second bosses which are arranged on the circular plate and are positioned at the intersection positions of the circular plate and each radial plate, and also comprises (i-2) xk fourth bosses which are arranged on the circular plate, wherein (i-2) fourth bosses are arranged between every two adjacent second bosses, all the bosses of the ith second boss group are uniformly distributed along the circumferential direction, and i takes the value of 3, … and n-2 in sequence and then takes the value of n; the first boss group comprises three first bosses uniformly distributed along the circumference, the third boss group comprises k-3 third bosses, and the three first bosses and the k-3 third bosses are all arranged on the circular plate and are respectively positioned at the intersection positions of the circular plate and each radials; n-4 fifth bosses are arranged on the circular plate between each first boss and the third bosses on the two sides; the arc length of each fifth boss is equal to that of the arc between the first boss and the third boss on the two sides; a circular plate is provided with (n-3) xk sixth bosses between every two adjacent third bosses; arc lengths of arcs clamped between two adjacent sixth bosses on the (n-1) th circular plate and between the sixth bosses and the third bosses are equal; each first boss is provided with a flexible supporting unit, and each second boss, each third boss, each fourth boss, each fifth boss and each sixth boss are provided with a memory alloy fine-tuning unit;
the flexible supporting unit comprises a bottom supporting plate I, a flexible supporting block I and a top plate supporting plate I which are coaxially arranged; one end of the first flexible supporting block is fixed with the first bottom supporting plate, and the other end of the first flexible supporting block is fixed with the first top plate supporting plate; a transition fillet II is arranged at the joint of the first flexible supporting block and the first top plate, and a transition fillet III is arranged at the joint of the first flexible supporting block and the first bottom plate; the lateral part of the top plate supporting plate I is provided with six weight reducing grooves I which are uniformly distributed along the circumference; the end face of the bottom supporting plate I is provided with six threaded holes uniformly distributed along the circumference and three weight reducing grooves II uniformly distributed along the circumference, and the two weight reducing grooves are positioned on the inner sides of the threaded holes; each threaded hole of the first bottom supporting plate is fixedly connected with a corresponding connecting through hole on the first boss through a fixing unit;
the memory alloy fine adjustment unit comprises a memory alloy wire, a bottom support plate II, a flexible support block II and a top plate support plate II which are coaxially arranged; one end of the second flexible supporting block is fixed with the second bottom supporting plate, and the other end of the second flexible supporting block is fixed with the second top plate supporting plate; six weight-reducing grooves I which are uniformly distributed along the circumference are formed in the two side parts of the top plate supporting plate; the three memory alloy wires are uniformly distributed along the circumferential direction, and two ends of each memory alloy wire are respectively connected with the second bottom supporting plate and the second top supporting plate through the first screws; wire connectors are fixed at two ends of the memory alloy wire; a pressure sensor is arranged in each of the three weight-reducing grooves I corresponding to the circumferential positions of the three memory alloy wires; the bottom support plate II is adhered to the second boss, the third boss, the fourth boss, the fifth boss or the sixth boss;
the pressure sensors of all the memory alloy fine adjustment units transmit detected pressure signals to the computer, and the magnitude of the current passing through the wire connectors of all the memory alloy fine adjustment units is controlled by the computer.
2. The flexible memory alloy support device for small-caliber light-weight mirrors according to claim 1, wherein: the fixing unit comprises a second screw, a spherical washer, a conical washer, a shaft sleeve and a spring washer; the shaft sleeve is fixedly sleeved in the connecting through hole of the first boss, and the spring washer is arranged between the first boss and the first bottom supporting plate; the spherical washer and the conical washer are both arranged on the back surface of the supporting base, and the conical washer is arranged between the spherical washer and the supporting base; the conical surface of the conical washer is contacted with the spherical surface of the spherical washer; and the second screw penetrates through the spherical washer, the conical washer, the shaft sleeve and the spring washer in sequence and is connected with the threaded hole of the first bottom support plate.
3. The flexible memory alloy support device for small-caliber light-weight mirrors according to claim 1, wherein: and the cementing surfaces of the first bottom supporting plate, the second bottom supporting plate and the second top supporting plate are provided with flow guide grooves.
4. The flexible memory alloy support device for small-caliber light-weight mirrors according to claim 1, wherein: stress relief grooves are formed in the first bottom supporting plate and the second bottom supporting plate.
5. The flexible memory alloy support device for small-caliber light-weight mirrors according to claim 1, wherein: the model of the pressure sensor is HX 711.
6. The flexible memory alloy support device for small-caliber light-weight mirrors according to claim 1, wherein: the pressure sensor is connected with the computer by a data line.
7. The flexible memory alloy support device for small-caliber light-weight mirrors according to claim 2, wherein: the support base, the first flexible support block and the second flexible support block are made of invar steel, the first top support plate, the second top support plate, the first bottom support plate and the second bottom support plate are made of CFRP, the memory alloy wire is made of TiNi, and the first screw and the second screw are made of TB 3.
8. The flexible memory alloy support device for small-caliber light-weight mirrors according to claim 2, wherein: the shaft sleeve is provided with a stress relief groove.
9. The flexible memory alloy support device for small-caliber light-weight mirrors according to claim 2, 7 or 8, wherein: and the bottom surface of the first bottom supporting plate, the top surface of the first boss, the circumferential surface of the first top supporting plate and the two end surfaces of the spring washer are respectively ground, and the contact surfaces of mutually contacted parts are subjected to lapping processing.
10. The flexible memory alloy support device for small-caliber light-weight mirrors according to claim 2, wherein: the assembly process is as follows:
1. grinding the wall of a supporting hole of the reflector, the bottom surface of the bottom supporting plate I, the top surface of the first boss, the circumferential surface of the top plate supporting plate I and two end surfaces of the spring washer respectively;
2. respectively gluing top plate supporting plates I of the three flexible supporting units into corresponding supporting holes of the reflector;
3. conducting lapping on the bottom surface of the bottom supporting plate and the top surface of the first boss;
4. firstly, fixing a memory alloy wire between a bottom supporting plate II and a top plate supporting plate II, and fixing a wire connector on the memory alloy wire to form a memory alloy fine adjustment unit; secondly, adhering a bottom supporting plate of each memory alloy fine adjustment unit to the back of the reflector through an adhesive, and adhering a top supporting plate of each memory alloy fine adjustment unit to each second boss, each third boss, each fourth boss, each fifth boss and each sixth boss of the supporting base through an adhesive;
5. connecting each pressure sensor with a computer through a data line;
6. and fixedly connecting each threaded hole of the first bottom supporting plate with the corresponding connecting through hole on the first boss through a fixing unit.
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| CN115166933B (en) * | 2022-06-22 | 2024-03-15 | 北京空间机电研究所 | Multi-point thermal control main mirror surface shape adjusting device and adjusting method |
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