CN117704245B - Gravity unloading device for large-caliber space camera - Google Patents
Gravity unloading device for large-caliber space camera Download PDFInfo
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- CN117704245B CN117704245B CN202410166427.2A CN202410166427A CN117704245B CN 117704245 B CN117704245 B CN 117704245B CN 202410166427 A CN202410166427 A CN 202410166427A CN 117704245 B CN117704245 B CN 117704245B
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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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- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention relates to the technical field of space gravity unloading, in particular to a gravity unloading device for a large-caliber space camera, which comprises a bottom support connected with an adjustment tool and an upper support connected with the space camera, wherein a sliding unit, a sensor unit, a rotary driving unit, a rotary adjusting unit, a height telescoping unit and a flexible unloading unit are sequentially arranged between the bottom support and the upper support, adjusting pieces matched with each other are arranged on the height telescoping unit and the rotary adjusting unit, an unloading force fine adjusting unit is formed, the flexible unloading unit comprises an elastic supporting seat, a sectional elastic assembly is arranged between the elastic supporting seat and the upper support, the sectional elastic assembly comprises an elastic supporting unloading section and an elastic suspending unloading section, and a locking assembly and a limiting assembly are further arranged between the rotary driving unit and the rotary adjusting unit. The gravity unloading device in the scheme can provide supporting unloading force and hanging unloading force, and can improve the ground adjustment precision of the space camera system while reducing the adjustment difficulty of the device.
Description
Technical Field
The invention relates to the technical field of space gravity unloading, and particularly provides a gravity unloading device for a large-caliber space camera.
Background
With the continuous development of space technology, the space camera is widely applied to various fields such as forestry monitoring, agricultural investigation, weather forecast, ocean observation, disaster prevention, topography and topography observation and the like. With the continuous upgrading of the use requirement, people are increasingly demanding space cameras with larger calibers, stronger light collecting capability and higher resolution, and with the increase of the caliber of the space cameras, the weight of the space cameras is greatly increased, the rigidity is sharply reduced, the whole machine of the space cameras is in a cantilever state when the integrated adjustment is carried out on the ground, so that structural deformation caused by gravity also participates in the adjustment process of the whole machine, when the space cameras are in a microgravity state after being lifted off, key structures of the space cameras, such as a force cylinder, each reflecting mirror component and the like, are subjected to rebound deformation due to the change of gravity environment, so that the relative positions and the surface shape precision of each reflecting mirror component are also slightly changed, and the imaging quality of the space cameras is finally influenced. Therefore, a reasonable gravity unloading device is required to be introduced when the ground adjustment of the large-caliber space camera is carried out, so that errors caused by insufficient static rigidity of the camera structure are compensated, and the ground adjustment precision of the whole system is improved.
The gravity unloading devices commonly used for space camera adjustment at present are various, and the common gravity unloading devices comprise a multi-point support method and a single-degree-of-freedom support method:
1. for the multipoint support based method: the scheme has the advantages that the unloading precision is higher, the application is more flexible, but the key point of the realization of the method is that a complex multipoint support system is needed, a plurality of proper gravity unloading points are selected outside the space camera body, a certain unloading force is provided through a complex coarse adjustment and fine adjustment belt lifting rope pulley block system, and the effect of counteracting the gravity on the whole machine assembly and adjustment is realized; the method also needs to carry out repeated iterative simulation analysis, and determines the space position of the unloading point and the magnitude of the unloading force by comparing the relative position relation of each space camera body with key indexes such as the surface shape of each space camera body, and the unloading force is provided by adopting a lifting rope hanging mechanism with a counterweight and a pulley assembly.
The plurality of unloading points and the different unloading points correspond to different unloading forces, so that the whole device is very complex in adjustment process, the requirement on the assembly precision of the whole gravity unloading device is higher, and the plurality of unloading device connectors are required to be reserved on the space camera body due to the fact that the unloading points are more, so that the camera body structure becomes more complex. The method has over-constraint phenomenon, and usually, the provision or adjustment of unloading force at a plurality of unloading points requires the manual increase and decrease of counterweight weights for operation, so that the labor intensity is high and mistakes are easy to occur.
2. For the single degree of freedom support method: compared with a multipoint support scheme, the method has the advantages that the structure is simpler, the operation is easy, only a small number of connectors of the unloading device are needed to be reserved on the camera body, only the unloading force opposite to the gravity direction can be provided at a certain key position of the space camera, the size of the unloading force is determined through simulation calculation, the relative position of each space camera body and the surface shape of each space camera body are guaranteed to meet the design requirements, the freedom degree of restricting the gravity direction only can be realized, the translational freedom degrees of the two directions in the plane are released, the manual operation strength is small, and the error is relatively difficult.
However, most single-degree-of-freedom support gravity unloading devices can only realize support unloading and can not realize suspension unloading, namely, only can provide a certain support force but can not provide the pulling force required by the space camera suspension, and can not provide the suspension unloading force after the camera is turned 180 degrees.
In summary, how to design a gravity unloading device suitable for a space camera, which can provide a supporting unloading force and a hanging unloading force, reduce the difficulty of assembling and adjusting, and improve the accuracy of assembling and adjusting the ground, on the basis of fully considering the advantages and disadvantages of the two unloading devices is a problem to be solved.
Disclosure of Invention
The invention aims to solve the problems, and provides the gravity unloading device for the large-caliber space camera, which has the advantages of simple structure, easy operation, capability of simultaneously providing supporting unloading force and hanging unloading force, low assembling and adjusting difficulty and high assembling and adjusting precision.
The invention provides a gravity unloading device for a large-caliber space camera, which particularly comprises a bottom support connected with an assembling and adjusting tool and an upper support connected with the space camera; a sliding unit, a sensor unit, a rotary driving unit, a rotary adjusting unit, a height telescopic unit and a flexible unloading unit are sequentially arranged between the bottom support and the upper support, the sliding unit is connected to the bottom support, and the flexible unloading unit is connected to the upper support; the height expansion unit and the rotation adjusting unit are provided with adjusting pieces which are matched with each other and form an unloading force fine adjusting unit; the rotation adjusting unit is driven to rotate by the rotation driving unit, the height telescoping unit and the rotation adjusting unit form linkage through the unloading force fine adjustment unit, and the flexible unloading unit and the height telescoping unit are linked; the flexible unloading unit comprises an elastic supporting seat connected to one side of the height telescopic unit, which is close to the upper support, a sectional elastic assembly is arranged between the elastic supporting seat and the upper support, and the sectional elastic assembly comprises a supporting unloading section elastic piece and a hanging unloading section elastic piece; and a locking component and a limiting component are further arranged between the rotary driving unit and the rotary adjusting unit.
Further, the rotary driving unit comprises a driving support and a driving piece arranged on the driving support; the height expansion unit and the rotation adjusting unit are connected to the driving support through an upper bearing assembly and a lower bearing assembly respectively; the sensor unit is connected between the driving support and the sliding unit.
Further, the rotation adjusting unit and the height telescoping unit respectively comprise an adjusting seat and an adjusting screw rod which are connected with the driving support, the unloading force fine-tuning unit comprises an adjusting piece I arranged on the adjusting seat and an adjusting piece II arranged on the adjusting screw rod, and the adjusting piece I can be abutted with the adjusting piece II and drive the adjusting piece II and the adjusting screw rod to rotate; the adjusting screw is connected with an adjusting nut in a threaded manner and is connected with the elastic supporting seat.
Further, the driving support comprises a supporting frame and a connecting frame positioned at the upper end of the supporting frame; the limiting assembly comprises a limiting ring groove and a limiting ball positioned in the limiting ring groove, wherein the limiting ring groove consists of a first ring groove matched with the outer wall of the connecting frame and a second ring groove matched with the inner wall of the adjusting seat; the adjusting seat is provided with a limiting hole communicated with the limiting ring groove, and a limiting rod is arranged in the limiting hole; the locking component is arranged on the adjusting seat and is staggered with the limiting hole and the second annular groove.
Further, the sectional type elastic component comprises a connecting column which is connected to the elastic supporting seat and can stretch up and down along with the elastic supporting seat, the supporting unloading section elastic piece and the hanging unloading section elastic piece are both sleeved on the connecting column, the supporting unloading section elastic piece is located at one end, close to the elastic supporting seat, of the connecting column, and the hanging unloading section elastic piece is located at one end, far away from the elastic supporting seat, of the connecting column.
Further, the upper support comprises an upper top plate connected with the space camera and a lower top plate positioned between the upper top plate and the elastic support seat, a plurality of upper through holes and lower through holes are respectively uniformly distributed on the upper top plate and the lower top plate, and the connecting column penetrates through the lower through holes and can stretch out and draw back in the upper through holes; the upper end and the lower end of the supporting unloading section elastic piece are respectively connected between the elastic supporting seat and the lower top plate, and the upper end and the lower end of the hanging unloading section elastic piece are respectively connected between the end part of the connecting column, which is far away from one end of the lower top plate, and the lower top plate.
Further, the upper end of the adjusting seat is provided with a connecting table in an upward extending way, the first adjusting piece is an adjusting knob arranged on the connecting table, the second adjusting piece is an adjusting block fixedly connected to the adjusting screw rod, and the adjusting block is positioned above the adjusting seat; the adjusting block is provided with a contact area which is abutted with the head of the adjusting knob.
Further, the lower bearing component is a deep groove ball bearing arranged among the adjusting seat, the connecting frame and the supporting frame; the upper bearing assembly comprises an angular contact ball bearing positioned between the lower part of the adjusting screw rod and the inner wall of the connecting frame; a linear bearing is also arranged between the upper part of the adjusting screw rod and the elastic supporting seat.
Further, the sliding unit comprises a guide rail arranged at the upper end of the bottom support and a sliding block connected to the guide rail in a sliding manner; the sensor unit comprises a mounting seat connected to the sliding block and a pressure sensor connected between the mounting seat and the supporting frame.
Further, the driving piece is a stepping motor, and a power output end of the stepping motor is connected with a driving gear positioned above the supporting frame; the outer wall of the adjusting seat is provided with an executing gear meshed with the driving gear, and the adjusting seat rotates along with the executing gear.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention fully considers the advantages and disadvantages of two gravity unloading methods based on a multi-point supporting method and a single-degree-of-freedom supporting method, adopts a scheme design based on the single-degree-of-freedom supporting method to finish the gravity unloading device, adopts a plurality of structures such as a stepping motor, a pressure sensor, an adjusting screw adjusting nut component, a deep groove ball bearing, an angular contact ball bearing, a linear bearing, an adjusting knob, a hanging unloading section elastic piece, a supporting unloading section elastic piece and the like, can simultaneously provide the space camera supporting unloading force and the hanging unloading force, and provides the unloading force opposite to the gravity direction by combining the stepping motor and the adjusting knob, so that the adjustment process of the whole device can be combined with rough adjustment and fine adjustment, and the size of the unloading force is determined according to the indication number of the pressure sensor.
2. Compared with a gravity unloading device based on a multipoint supporting method, the gravity unloading device is simpler in structural form and easy to operate, only a certain unloading force opposite to the gravity direction is provided at a certain key position of a space camera, the space positions of a plurality of unloading points and the unloading force of different unloading points are not required to be determined, the stepping motor and the miniature adjusting knob are used for combined adjustment to provide the unloading force, continuous adjustment of the unloading force can be approximately realized, the problems that a plurality of counterweight weights with different masses are required by the multipoint supporting scheme and continuous adjustment of the unloading force cannot be realized can be avoided, in comparison, the manual operation strength of the scheme is small, the adjustment is convenient, errors are not easy to occur, meanwhile, the flexible unloading unit and the sliding unit are used for realizing only a single degree of freedom for restraining the gravity direction of the unloading points, the rest degrees of freedom of the unloading points are released, the unloading force can be determined by using the high-precision pressure sensor through reading the numerical value of a display, and the unloading force is more accurate and reliable than the unloading force provided by a lifting rope pulley block system with the counterweight.
Drawings
Fig. 1 is a schematic view (perspective view) of the overall structure of a gravity unloading device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the overall structure of a gravity unloading device according to an embodiment of the present invention (front view);
FIG. 3 is a cross-sectional view taken in the direction B-B in FIG. 2;
FIG. 4 is a schematic view of the structure of an adjusting seat according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a rotary driving unit provided according to an embodiment of the present invention;
FIG. 6 is a schematic view of the installation of a gravity discharge device according to an embodiment of the present invention when supporting gravity discharge;
fig. 7 is a schematic view of the installation of the gravity unloading device when hanging gravity unloading according to the embodiment of the invention.
Wherein reference numerals include: the device comprises a bottom support 1, an upper support 2, a sliding unit 3, a sensor unit 4, a rotary driving unit 5, a rotary adjusting unit 6, a height telescoping unit 7, a flexible unloading unit 8, an unloading force fine adjusting unit 9, a mounting hole 10, an elastic supporting seat 11, a supporting unloading section elastic piece 12, a hanging unloading section elastic piece 13, a limiting block 14, a driving support 15, a driving piece 16, an adjusting seat 17, an adjusting screw 18, an adjusting piece one 19, an adjusting piece two 20, an adjusting nut 21, a supporting frame 22, a connecting frame 23, a limiting ball 24, a ring groove one 25, a ring groove two 26, a limiting hole 27, a limiting rod 28, a connecting column 29, an upper top plate 30, a lower top plate 31, an upper through hole 32, a connecting table 33, a contact area 34, a deep groove ball bearing 35, an angular contact ball bearing 36, a linear bearing 37, a guide rail 38, a sliding block 39, a mounting seat 40, a pressure sensor 41, a driving gear 42, a carrying gear 43, a bearing pressing ring 44, a force bearing cylinder 45, a mounting and adjusting tool 46, a mounting and adjusting platform 47, a turnover adjusting frame 48, and a driver 49.
Detailed Description
Hereinafter, an embodiment of the present invention will be described with reference to fig. 1 to 7. In the following description, like modules are denoted by like reference numerals. In the case of the same reference numerals, their names and functions are also the same. Therefore, a detailed description thereof will not be repeated.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to fig. 1 to 7 and the specific embodiments thereof. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limiting the invention.
The utility model provides a heavy-calibre space camera gravity uninstallation device, as shown in fig. 1, including bottom support 1 and upper bracket 2, be equipped with sliding unit 3, sensor unit 4, rotation driving unit 5, rotation adjustment unit 6, high telescoping unit 7 and flexible uninstallation unit 8 in proper order between bottom support 1 and the upper bracket 2, sliding unit 3 connects on bottom support 1, flexible uninstallation unit 8 connects on upper bracket 2, high telescoping unit 7 is equipped with the regulating part that matches each other on with rotation adjustment unit 6 and forms uninstallation power fine setting unit 9. The rotation adjusting unit 6 is driven to rotate by the rotation driving unit 5, the height telescoping unit 7 and the rotation adjusting unit 6 form linkage through the unloading force fine adjusting unit 9, the flexible unloading unit 8 and the height telescoping unit 7 are linked, coarse adjustment is carried out through the rotation driving unit 5, the rotation adjusting unit 6, the height telescoping unit 7 and the flexible unloading unit 8, and fine adjustment is carried out through the unloading force fine adjusting unit 9.
As shown in fig. 1 to 3, the rotation driving unit 5 includes a driving support 15 and a driving member 16 provided on the driving support 15, the driving member 16 includes a driver 49, the height expansion unit 7 and the rotation adjusting unit 6 are connected to the driving support 15 through an upper bearing assembly and a lower bearing assembly, respectively, and the sensor unit 4 is connected between the driving support 15 and the sliding unit 3. The driving support 15 comprises a supporting frame 22 and a connecting frame 23 positioned at the upper end of the supporting frame 22, the driving piece 16 is a stepping motor, the driving piece 16 is connected below the supporting frame 22, and a power output end of the stepping motor is connected with a driving gear 42 positioned above the supporting frame 22.
The rotation adjusting unit 6 and the height telescoping unit 7 respectively comprise an adjusting seat 17 and an adjusting screw 18 connected with the connecting frame 23 in the driving support 15, an executing gear 43 meshed with the driving gear 42 is arranged on the outer wall of the adjusting seat 17, the executing gear 43 is integrally formed on the adjusting seat 17, and the adjusting seat 17 rotates along with the executing gear 43. Still be equipped with locking subassembly and spacing subassembly between rotatory drive unit 5 and the rotatory adjusting unit 6, as shown in fig. 4, 5, spacing subassembly includes spacing annular and the spacing ball 24 that is located spacing annular, spacing annular comprises the annular one 25 that matches on the link 23 outer wall and the annular two 26 on the adjusting seat 17 inner wall together, set up on the adjusting seat 17 with spacing hole 27 of spacing annular intercommunication, be equipped with the gag lever post 28 in the spacing hole 27, spacing ball 24 is put into spacing annular in spacing hole 27 department, the gag lever post 28 can prevent spacing ball 24 from coming off in the spacing annular, can guarantee through spacing annular, spacing ball 24 and gag lever post 27 that adjusting seat 17 still remains to be connected with drive support 15 when hanging the uninstallation, spacing ball 24 here is 2.5 mm's steel ball.
The locking component is arranged on the adjusting seat 17 and staggered with the limiting hole 27 and the second annular groove 26, and specifically comprises a plurality of mounting holes 10 which are formed in the adjusting seat 17 along the circumferential direction, the mounting holes 10 are located above the second annular groove 26 and the limiting hole 27, jackscrews are arranged in the mounting holes 10, and the mounting holes 10 and jackscrews are used for fixing the adjusting seat 17 and the driving support 15 after the device is roughly adjusted so as to enable the adjusting seat 17 and the driving support 15 to be locked and positioned when fine adjustment is performed.
The flexible unloading unit 8 comprises an elastic supporting seat 11 connected to one side, close to the upper support 2, of the height telescopic unit 7, an adjusting nut 21 is connected to the adjusting screw rod 18 in a threaded mode, the adjusting nut 21 is connected with the elastic supporting seat 11, a linear bearing 37 is further arranged between the upper portion of the adjusting screw rod 18 and the elastic supporting seat 11, and the linear bearing 37 can ensure that the adjusting screw rod 18 and the adjusting nut 21 move along the axis when in relative movement.
The unloading force fine adjustment unit 9 comprises a first adjusting piece 19 arranged on the adjusting seat 17 and a second adjusting piece 20 arranged on the adjusting screw 18, wherein the first adjusting piece 19 can be abutted with the second adjusting piece 20 and drive the second adjusting piece 20 and the adjusting screw 18 to rotate. The upward extension of regulating seat 17 upper end is equipped with connecting bench 33, and regulating part one 19 is the miniature adjust knob of locating on connecting bench 33, and regulating part two 20 is fixed connection's regulating block on adjusting screw 18, and the regulating block is located regulating seat 17 top, is equipped with the contact zone 34 with miniature adjust knob's head butt on the regulating block, and miniature adjust knob's head is the bulb form, and contact zone 34 is the curved surface form with miniature adjust knob's head matching butt, and miniature adjust knob's head is the point contact form with contact zone 34 to miniature adjust knob contacts when promoting the regulating block better. The adjusting block is fixed with the adjusting screw rod 18 through the M3 jackscrew, so that no relative movement occurs between the adjusting block and the adjusting seat, and the miniature adjusting knob is contacted with the adjusting block through adjusting the relative position of the adjusting seat 17 and the adjusting block.
The sectional type elastic component is arranged between the elastic supporting seat 11 and the upper support seat 2, and comprises a supporting unloading section elastic piece 12, a hanging unloading section elastic piece 13 and a connecting column 29 connected to the elastic supporting seat 11, wherein the connecting column 29 can stretch up and down along with the elastic supporting seat 11, the supporting unloading section elastic piece 12 and the hanging unloading section elastic piece 13 are sleeved on the connecting column 29, the supporting unloading section elastic piece 12 is positioned at one end, close to the elastic supporting seat 11, of the connecting column 29, the hanging unloading section elastic piece 13 is positioned at one end, far away from the elastic supporting seat 11, of the connecting column 29, and the supporting unloading section elastic piece 12 and the hanging unloading section elastic piece 13 are telescopic springs.
The upper support 2 comprises an upper top plate 30 and a lower top plate 31, the upper top plate 30 is connected with the space camera, the lower top plate 31 is located between the upper top plate 30 and the elastic supporting seat 11, a plurality of upper through holes 32 and lower through holes are respectively and uniformly distributed on the upper top plate 30 and the lower top plate 31, and the connecting column 29 is arranged in the lower through holes in a penetrating mode and can stretch out and draw back in the upper through holes 32. The upper and lower ends of the supporting unloading section elastic piece 12 are respectively connected between the elastic supporting seat 11 and the lower top plate 31, the upper and lower ends of the hanging unloading section elastic piece 13 are respectively connected between the end part of the connecting column 29, which is far away from one end of the lower top plate 31, and the lower top plate 31, a limiting block 14 is arranged at one end of the connecting column 29, which is far away from the lower top plate 31, the upper end of the hanging unloading section elastic piece 13 is connected on the limiting block 14, and the diameter of the limiting block 14 is not larger than that of the upper through hole 32.
The lower bearing assembly is a deep groove ball bearing 35 arranged among the adjusting seat 17, the connecting frame 23 and the supporting frame 22, and the adjusting seat 17 can smoothly rotate on the driving support 15 through the deep groove ball bearing 35. The upper bearing assembly comprises an angular contact ball bearing 36 positioned between the lower part of the adjusting screw rod 18 and the inner wall of the connecting frame 23, wherein a bearing pressing ring 44 is arranged on the angular contact ball bearing 36, and the angular contact ball bearing is pressed and fixed through the bearing pressing ring 44. The slide unit 3 comprises a guide rail 38 provided at the upper end of the foot rest 1 and a slide 39 slidably connected to the guide rail 38, the gravity unloading device being free to move along the guide rail 38 by means of the guide rail 38 and the slide 39. The sensor unit 4 includes a mount 40 connected to the slider 39 and a pressure sensor 41 connected between the mount 40 and the support 22, the pressure sensor 41 being screwed between the mount 40 and the support 22.
Because the rigidity of the large-caliber space camera is lower, structural deformation occurs under the action of gravity when the ground is assembled and adjusted, and the deformation is mainly the coupling deformation of the gravity direction and the direction along the optical axis, but not the single deformation along the gravity direction, so that only one degree of freedom in the gravity direction needs to be considered when the gravity unloading device is designed, the rest degrees of freedom of the unloading point are released, the phenomenon of over-constraint on the space camera is avoided, the structure above the mounting seat 40 can be ensured to smoothly move along the moving direction of the guide rail 38 by the guide rail 38 and the sliding block 39, meanwhile, the flexible unloading unit 8 is integrally designed by adopting a flexible structure, the flexible unloading unit 8 can elastically deform when the unloading force is applied by simulation analysis, so that the space camera moves in the horizontal plane of the unloading point and is perpendicular to the moving direction of the guide rail 38, and the gravity unloading device can be ensured to be limited by the guide rail 38, the sliding block 39 and the flexible unloading unit 8, namely the unloading force opposite to the gravity direction is only provided, and the over-constraint phenomenon is avoided, and the ground assembling and adjusting precision can be ensured.
In use, the base support is connected with the adjustment tool 46 and the upper support 2 is connected with the space camera. Before the unloading force adjustment, the adjusting piece two 20 is adjusted up and down and in the circumferential direction, so that the head position of the adjusting piece two 20 and the adjusting piece one 19, namely the miniature adjusting knob, just contacts the contact area 34 of the adjusting piece two 20.
When the support is unloaded, as shown in fig. 6, the gravity unloading device shown at P is connected to the adjustment tool 46, and specifically connected between the adjustment table 47 and the bearing cylinder 45 at the secondary mirror end of the space camera, wherein the upper support 2 is connected with the bearing cylinder 45, and the bottom support 1 is connected with the adjustment table 47. Because the main mirror of the space camera is positioned at one side of the adjusting tool 46, the rigidity is high, the deformation caused by gravity is smaller, the distance between the main mirror and the secondary mirror is longer, the secondary mirror end is in a cantilever state, and meanwhile, the relative position between the main mirror and the secondary mirror has the greatest influence on the imaging quality of the whole camera, so that the gravity unloading device is placed at the bottom of the bearing cylinder 45 at the secondary mirror end of the space camera, and the relative position of the main mirror and the secondary mirror is ensured to be consistent with the state before and after the emission by providing a certain unloading force.
The theoretical unloading force F is determined according to the simulation result of the whole machine, and the adjustment scheme of the gravity unloading device is determined by comparing the indication F1 of the pressure sensor 41 with the theoretical unloading force F. The coarse adjustment process is to adjust the rotation of the stepping motor, the driving gear 42 is meshed with the execution gear 43 to drive the adjusting seat 17 to rotate, the deep groove ball bearing 35 is arranged between the adjusting seat 17 and the driving support 15, the relative movement between the adjusting seat 17 and the adjusting seat can be ensured, the adjusting seat 17 drives the micro adjusting knob on the adjusting seat to rotate, the head of the micro adjusting knob pushes the adjusting piece II 20 to rotate, the adjusting piece II 20 drives the adjusting screw 18 to rotate, the adjusting nut 21 drives the elastic support seat 11 to upwards press the elastic support unloading section 12, and the elastic support unloading section 12 is pressed and transmits unloading force to an unloading point on the space camera.
Because the working characteristics of the stepper motor cannot make the indication F1 of the pressure sensor 41 equal to the theoretical unloading force F by only adjusting the stepper motor, when the indication F1 of the pressure sensor 41 has a smaller value difference from the theoretical unloading force F, jackscrews circumferentially distributed in the mounting holes 10 on the screw adjusting seat 17 fix the adjusting seat 17 and the driving support 15, so that no relative movement occurs between the adjusting seat and the driving support, and fine adjustment is performed.
The fine adjustment process mainly comprises the steps of adjusting a micro adjusting knob, namely an adjusting piece I19, wherein the indexing value of the micro adjusting knob is 0.001mm, the precision is high, the fine adjustment process after coarse adjustment can be met, specifically, the micro adjusting knob is screwed to drive the adjusting piece II 20 to rotate by a small amount through comparing the value of the index F1 of the pressure sensor 41 with the value of the theoretical unloading force F, further, the relative movement of an adjusting screw 18 and an adjusting nut 21 is pressed against an elastic piece 12 of the supporting unloading section, the fine adjustment of the unloading force is achieved, when the index F1 of the pressure sensor 41 is equal to the theoretical unloading force F, screwing of the micro adjusting knob is stopped, the adjustment process of the gravity unloading device is completed, whether the index F1 of the pressure sensor 41 is equal to the theoretical unloading force F is observed when the whole machine is installed and adjusted on the ground, and if the index F1 of the pressure sensor 41 is not equal to the theoretical unloading force F is not equal, the micro adjusting knob can be adjusted until the two values are equal.
When the whole machine is turned 180 degrees to carry out suspension unloading, as shown in fig. 7, the gravity unloading device turns over along with the whole machine, at this time, the bottom support 1 is located above and connected with the turning adjustment frame 48, the upper support 2 is located below and still connected with the bearing cylinder 45, the height of the gravity unloading device is changed by adjusting the stepping motor to enable the bottom support 1 to be connected with the upper part connected with the turning adjustment frame 48, and the adjustment process of the unloading force during suspension unloading is consistent with the adjustment process during supporting unloading, which is not repeated herein, and it is worth noting that the elastic piece 13 of the suspension unloading section is compressed during suspension unloading.
While embodiments of the present invention have been illustrated and described above, it will be appreciated that the above described embodiments are illustrative and should not be construed as limiting the invention. Variations, modifications, alternatives and variations of the above-described embodiments may be made by those of ordinary skill in the art within the scope of the present invention.
The above embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (8)
1. The gravity unloading device for the large-caliber space camera is characterized by comprising a bottom support (1) connected with an assembling and adjusting tool (46) and an upper support (2) connected with the space camera; a sliding unit (3), a sensor unit (4), a rotary driving unit (5), a rotary adjusting unit (6), a height telescopic unit (7) and a flexible unloading unit (8) are sequentially arranged between the bottom support (1) and the upper support (2), the sliding unit (3) is connected to the bottom support (1), and the flexible unloading unit (8) is connected to the upper support (2); the height telescopic unit (7) and the rotation adjusting unit (6) are provided with adjusting pieces which are matched with each other and form an unloading force fine adjusting unit (9); the rotation adjusting unit (6) is driven to rotate by the rotation driving unit (5), the height telescopic unit (7) and the rotation adjusting unit (6) are in linkage through the unloading force fine adjustment unit (9), and the flexible unloading unit (8) is in linkage with the height telescopic unit (7); the flexible unloading unit (8) comprises an elastic supporting seat (11) connected to one side, close to the upper support (2), of the height telescopic unit (7), and a sectional elastic assembly is arranged between the elastic supporting seat (11) and the upper support (2) and comprises an elastic supporting unloading section (12) and an elastic hanging unloading section (13); a locking component and a limiting component are also arranged between the rotary driving unit (5) and the rotary adjusting unit (6);
the rotary driving unit (5) comprises a driving support (15) and a driving piece (16) arranged on the driving support (15); the height telescopic unit (7) and the rotation adjusting unit (6) are connected to the driving support (15) through an upper bearing assembly and a lower bearing assembly respectively; the sensor unit (4) is connected between the driving support (15) and the sliding unit (3);
the rotation adjusting unit (6) and the height telescoping unit (7) respectively comprise an adjusting seat (17) and an adjusting screw (18) which are connected with the driving support (15), the unloading force fine adjusting unit (9) comprises an adjusting piece I (19) arranged on the adjusting seat (17) and an adjusting piece II (20) arranged on the adjusting screw (18), and the adjusting piece I (19) can be abutted with the adjusting piece II (20) and drive the adjusting piece II (20) and the adjusting screw (18) to rotate; an adjusting nut (21) is connected to the adjusting screw (18) in a threaded manner, and the adjusting nut (21) is connected with the elastic supporting seat (11).
2. The gravity unloading device for the large-caliber space camera according to claim 1, wherein the driving support (15) comprises a supporting frame (22) and a connecting frame (23) positioned at the upper end of the supporting frame (22); the limiting assembly comprises a limiting ring groove and a limiting ball (24) positioned in the limiting ring groove, wherein the limiting ring groove consists of a first ring groove (25) matched with the outer wall of the connecting frame (23) and a second ring groove (26) matched with the inner wall of the adjusting seat (17); a limiting hole (27) communicated with the limiting ring groove is formed in the adjusting seat (17), and a limiting rod (28) is arranged in the limiting hole (27); the locking component is arranged on the adjusting seat (17) and staggered with the limiting hole (27) and the second ring groove (26).
3. The gravity unloading device for the large-caliber space camera according to claim 2, wherein the sectional elastic assembly comprises a connecting column (29) which is connected to the elastic supporting seat (11) and can stretch up and down along with the elastic supporting seat (11), the supporting unloading section elastic piece (12) and the hanging unloading section elastic piece (13) are sleeved on the connecting column (29), the supporting unloading section elastic piece (12) is positioned at one end, close to the elastic supporting seat (11), of the connecting column (29), and the hanging unloading section elastic piece (13) is positioned at one end, far away from the elastic supporting seat (11), of the connecting column (29).
4. A heavy caliber space camera gravity unloading device according to claim 3, wherein the upper support (2) comprises an upper top plate (30) connected with the space camera and a lower top plate (31) positioned between the upper top plate (30) and the elastic supporting seat (11), a plurality of upper through holes (32) and lower through holes are respectively uniformly distributed on the upper top plate (30) and the lower top plate (31), and the connecting column (29) is arranged in the lower through holes in a penetrating manner and can stretch in the upper through holes (32); the upper end and the lower end of the supporting unloading section elastic piece (12) are respectively connected between the elastic supporting seat (11) and the lower top plate (31), and the upper end and the lower end of the hanging unloading section elastic piece (13) are respectively connected between the end part of the connecting column (29) far away from one end of the lower top plate (31) and the lower top plate (31).
5. The gravity unloading device for the large-caliber space camera according to claim 4, wherein a connecting table (33) is arranged at the upper end of the adjusting seat (17) in an upward extending mode, the first adjusting piece (19) is an adjusting knob arranged on the connecting table (33), the second adjusting piece (20) is an adjusting block fixedly connected to the adjusting screw rod (18), and the adjusting block is located above the adjusting seat (17); the adjusting block is provided with a contact area (34) which is abutted with the head of the adjusting knob.
6. The gravity unloading device for a large-caliber space camera according to claim 5, wherein the lower bearing assembly is a deep groove ball bearing (35) arranged among an adjusting seat (17), a connecting frame (23) and a supporting frame (22); the upper bearing assembly comprises an angular contact ball bearing (36) positioned between the lower part of the adjusting screw rod (18) and the inner wall of the connecting frame (23); a linear bearing (37) is also arranged between the upper part of the adjusting screw rod (18) and the elastic supporting seat (11).
7. The gravity unloading device for a large-caliber space camera according to claim 6, wherein the sliding unit (3) comprises a guide rail (38) arranged at the upper end of the bottom support (1) and a sliding block (39) connected to the guide rail (38) in a sliding manner; the sensor unit (4) comprises a mounting seat (40) connected to the sliding block (39) and a pressure sensor (41) connected between the mounting seat (40) and the supporting frame (22).
8. The gravity unloading device of the large-caliber space camera according to claim 7, wherein the driving piece (16) is a stepping motor, and a driving gear (42) positioned above the supporting frame (22) is connected to a power output end of the stepping motor; an execution gear (43) meshed with the driving gear (42) is arranged on the outer wall of the adjusting seat (17), and the adjusting seat (17) rotates along with the execution gear (43).
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| CN202410166427.2A CN117704245B (en) | 2024-02-06 | 2024-02-06 | Gravity unloading device for large-caliber space camera |
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| CN202410166427.2A CN117704245B (en) | 2024-02-06 | 2024-02-06 | Gravity unloading device for large-caliber space camera |
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| CN117704245B true CN117704245B (en) | 2024-04-09 |
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| CN115676674A (en) * | 2022-10-31 | 2023-02-03 | 中国科学院长春光学精密机械与物理研究所 | Magnetic-gas mixed suspension gravity unloading device and system |
| CN219013887U (en) * | 2022-11-16 | 2023-05-12 | 成都微精控科技有限公司 | Supporting mechanism and gravity unloading device |
| CN116500748A (en) * | 2023-04-28 | 2023-07-28 | 中国科学院长春光学精密机械与物理研究所 | Gravity unloading mechanism for reflecting mirror |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2088959C1 (en) * | 1994-03-14 | 1997-08-27 | Акционерное общество "ЛОМО" | Device for unloading of optical instrument mirror |
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| CN112255868A (en) * | 2020-10-30 | 2021-01-22 | 长光卫星技术有限公司 | Gravity unloading device for large off-axis three-mirror space camera |
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| CN219013887U (en) * | 2022-11-16 | 2023-05-12 | 成都微精控科技有限公司 | Supporting mechanism and gravity unloading device |
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| CN117704245A (en) | 2024-03-15 |
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