CN113532900A - A gravity compensation device for one-dimensional turntable ground test - Google Patents
A gravity compensation device for one-dimensional turntable ground testDownload PDFInfo
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- CN113532900A CN113532900ACN202110832011.6ACN202110832011ACN113532900ACN 113532900 ACN113532900 ACN 113532900ACN 202110832011 ACN202110832011 ACN 202110832011ACN 113532900 ACN113532900 ACN 113532900A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G7/00—Simulating cosmonautic conditions, e.g. for conditioning crews
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- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
Translated fromChinese
Description
Technical Field
The invention relates to ground test equipment, in particular to a gravity compensation device for a ground test of a one-dimensional rotary table.
Background
The related ground test of the space mechanism is an important assessment process before launching, and in the process of ground test and debugging, the gravity effect can generate great influence on the test result. Therefore, ground tests based on the micro-low gravity simulation technology are important guarantees for the success of the space mission.
At present, gravity compensation methods adopted by ground tests of the micro-low gravity simulation technology mainly comprise a water float method, a suspension method, an air float method and the like.
For a one-dimensional turntable, the limitation of a water floatation method is large, the structure of a suspension method is complex, the air floatation method supports a rotating part through an air floatation bearing to separate the rotating part from a base, the friction force in the rotating process is reduced, and the state of low gravity or zero gravity is realized.
The rotating shaft system of the one-dimensional turntable comprises a stator shell, a rotor and an angular contact bearing arranged between the stator and the rotor; at present, when the ground test of the micro-low gravity simulation technology is carried out by adopting an air floatation method, a stator shell is directly connected with an air bearing, and a rotor is connected with an external load. However, the adoption of the connection mode can cause the angular contact bearing to be influenced by the gravity of an external load, and the service life of the angular contact bearing is greatly shortened.
Disclosure of Invention
The invention provides a gravity compensation device for a ground test of a one-dimensional turntable, aiming at solving the problem that when the ground test of a micro-low gravity simulation technology is carried out by adopting an air floatation method, the service life of an angular contact bearing in the one-dimensional turntable is greatly shortened due to the influence of the gravity of an external load.
The technical scheme adopted by the invention is as follows:
the utility model provides a gravity compensation device for one-dimensional revolving stage ground test which characterized in that: the air floatation bearing comprises a conical coupling, an air floatation bearing, a pressure sensor and an installation platform;
the stator of the air bearing is connected with the mounting platform, the rotor of the air bearing is provided with a pressure sensor, the pressure sensor is connected with the lower end of the rotor of the one-dimensional rotary table through a conical coupler, and the upper end of the rotor of the one-dimensional rotary table is used for mounting an external load.
Further, the mounting platform is a three-dimensional moving platform and comprises a lifting mechanism for adjusting the air bearing to move along the vertical direction and a two-dimensional aligning mechanism for adjusting the air bearing to move on the horizontal plane.
Further, the lifting mechanism comprises a base, supporting legs, a guide rod, a screw rod and a bottom plate;
a plurality of support legs are arranged below the base;
the number of the guide rods is at least three, the upper ends of the at least three guide rods are fixed on the bottom plate, and the lower ends of the at least three guide rods penetrate through the base and are suspended;
the screw rod is in threaded connection with the base, the upper end of the screw rod is in contact with the bottom plate, the lower end of the screw rod is used as a driving part for the screw rod to rotate, and the screw rod is located among the at least three guide rods.
Further, the two-dimensional aligning mechanism comprises a transverse sliding table base, a transverse ball guide rail, a transverse ball sliding block, a longitudinal sliding table base, a longitudinal ball guide rail, a longitudinal ball sliding block and a longitudinal ball sliding table;
the two transverse sliding table bases are fixedly arranged on the bottom plate in parallel;
two transverse ball guide rails are arranged between the two transverse sliding table bases;
the two transverse ball guide rails are respectively provided with a transverse ball sliding block;
each transverse ball sliding block is provided with a longitudinal sliding table base;
a longitudinal ball guide rail is arranged between the two longitudinal sliding table bases;
a longitudinal ball sliding block is arranged on the longitudinal ball guide rail; and a longitudinal ball sliding table is arranged on the longitudinal ball sliding block and is connected with the air bearing stator.
Furthermore, the upper end of the screw rod is a spherical surface.
Further, the lower end of the screw is provided with a driving motor.
Furthermore, the shaft end of the conical coupling is arranged on the pressure sensor, and the base end of the conical coupling is arranged at the lower end of the rotor of the one-dimensional rotary table.
The invention has the beneficial effects that:
1. the rotor of the one-dimensional turntable is connected with the air bearing by the conical coupling, so that the angular contact bearing of the one-dimensional turntable is not influenced by the gravity of an external load any more, the service life of the angular contact bearing is prolonged, the magnitude of the reaction of the air bearing for counteracting the gravity of the one-dimensional turntable can be accurately obtained by utilizing the pressure sensor, and the reliability of a ground test is ensured.
2. The mounting platform for mounting the air bearing, which is composed of the lifting table and the two-dimensional aligning mechanism, realizes the automatic alignment of the air bearing and the one-dimensional turntable, ensures the coaxiality of the assembly of the air bearing and the one-dimensional turntable, and ensures the reliability of a ground test.
Drawings
Fig. 1 is a schematic view of an embodiment of a gravity compensation device provided by the present invention.
The reference numbers are as follows:
1-a conical coupling, 11-a conical coupling seat end and 12-a conical coupling shaft end;
2-a pressure sensor;
3-an air bearing;
4-a two-dimensional aligning mechanism, 41-a transverse sliding table base, 42-a transverse ball guide rail, 43-a transverse ball sliding block, 44-a longitudinal sliding table base, 45-a longitudinal ball guide rail, 46-a longitudinal ball sliding block and 47-a longitudinal ball sliding table;
5-lifting mechanism, 51-base, 52-supporting leg, 53-guide rod, 54-screw rod and 55-bottom plate;
6-rotor, 7-stator, 8-angular contact bearing.
Detailed Description
In order to make the objects, advantages and features of the present invention more clear, the following description will be made in detail with reference to the accompanying drawings, basic implementation principles and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that: the drawings are in simplified form and are not to precise scale, the intention being solely for the convenience and clarity of illustrating embodiments of the invention; secondly, the structures shown in the drawings are often part of the actual structure; again, the drawings may require different emphasis, sometimes on different proportions.
Basic principle of implementation
When the ground test of the micro-low gravity simulation technology is carried out by the existing air floatation method, the stator shell of the one-dimensional turntable is directly connected with the air bearing, and the rotor is connected with an external load, so that the angular contact bearing between the stator shell and the rotor can be influenced by the gravity of the external load, and the service life of the angular contact bearing can be greatly shortened; the stator of the air bearing is connected with the mounting platform, the rotor of the air bearing is provided with a pressure sensor, the pressure sensor is connected with the lower end of the rotor of the one-dimensional rotary table through a conical coupler, and the upper end of the rotor of the one-dimensional rotary table is used for mounting an external load. Just because the rotor directly links to each other with the air supporting bearing, and stator casing does not contact with the air supporting bearing, therefore angular contact bearing can not receive the influence of external load gravity, and angular contact bearing's life can guarantee to owing to adopted pressure sensor can directly obtain the gravity uninstallation state, the practicality strengthens greatly.
Examples
Fig. 1 shows a specific structure of a gravity compensation device for a one-dimensional turntable ground test, which comprises a conical coupling 1, a pressure sensor 2, an air bearing 3, a two-dimensional aligning mechanism 4 and alifting mechanism 5;
the one-dimensional turntable rotating shaft system comprises aninner rotor 6, anouter stator 7 and an angular contact bearing 8 between therotor 6 and thestator 7;
the lower end of arotor 6 of a one-dimensional turntable rotating shaft system is provided with a conical coupling 1 for butting with a pressure sensor 2, the pressure sensor 2 is connected with a rotor of an air bearing 3, a stator of the air bearing 3 is connected with a two-dimensional aligning mechanism 4, and the two-dimensional aligning mechanism 4 is arranged on alifting mechanism 5;
the assembly process of the gravity compensation device is as follows: firstly, a conicalcoupling seat end 11 is arranged on arotor 6 of a one-dimensional rotary table, then a conicalcoupling shaft end 12 is connected with a pressure sensor 2, then the pressure sensor 2 is arranged on a rotor of an air bearing 3, then a stator of the air bearing 3 is connected with a two-dimensional aligning mechanism 4, and finally the two-dimensional aligning mechanism 4 is connected with alifting mechanism 5.
The gravity compensation device is used as follows: firstly, high-pressure gas is introduced into the air bearing 3, thelifting mechanism 5 is started to enable the air bearing 3 to ascend, the conicalcoupling seat end 11 and the conicalcoupling shaft end 12 start to be in butt joint, the load unloading state is judged according to the pressure value collected by the pressure sensor 2, and when the pressure value reaches the gravity needing to be unloaded, thelifting mechanism 5 stops ascending. If the air bearing 3 is not concentric with therotor 6 of the one-dimensional turntable in the rising process of the air bearing 3, theseat end 11 of the conical coupling can generate normal acting force on theshaft end 12 of the conical coupling, so that the position of the air bearing 3 is automatically adjusted under the driving of the two-dimensional aligning mechanism 4, and the air bearing 3 is ensured to be coaxial with therotor 6 of the one-dimensional turntable.
Thelifting mechanism 5 in this embodiment specifically includes abase 51, aleg 52, aguide rod 53, ascrew 54, and abottom plate 55; a plurality oflegs 52 are provided below thebase 51; at least threeguide rods 53 are provided, the upper ends of the at least threeguide rods 53 are fixed on thebottom plate 51, and the lower ends of the at least threeguide rods 53 pass through thebase 51 and are suspended; thescrew 54 is screwed to thebase 51, the upper end of thescrew 54 is in contact with the bottom plate 55 (the upper end of the screw is spherical in order to allow the screw to rotate flexibly), the lower end of thescrew 54 serves as a driving part for rotating thescrew 54, and thescrew 54 is located between at least threeguide rods 53. Thedrive screw 54 may be rotated by pulling the lower end of the screw with a wrench, or may be rotated by providing a drive motor at the lower end of the screw.
The two-dimensional aligning mechanism 4 in the present embodiment includes a transversesliding table base 41, a transverseball guide rail 42, atransverse ball slider 43, a longitudinalsliding table base 44, a longitudinalball guide rail 45, alongitudinal ball slider 46, and a longitudinal ball sliding table 47; two transversesliding table bases 41 are arranged and fixedly mounted on thebottom plate 55 in parallel; two transverseball guide rails 42 are arranged between the two transversesliding table bases 41; the two transverseball guide rails 42 are respectively provided with a transverseball sliding block 43; each transverseball sliding block 43 is provided with a longitudinalsliding table base 44; a longitudinalball guide rail 45 is arranged between the two longitudinalsliding table bases 44; a longitudinalball sliding block 46 is arranged on the longitudinalball guide rail 45; and a longitudinal ball sliding table 47 is arranged on the longitudinalball sliding block 46, and the longitudinal ball sliding table 47 is connected with the air bearing 3 stator.
When thescrew 54 is rotated, the base plate vertically ascends or descends under the guiding action of theguide rod 53, so that the two-dimensional aligning mechanism 4 ascends or descends; when the transverse ball sliding table 44 is subjected to transverse force, the transverseball sliding block 43 fixed on the bottom surface of the transverse ball sliding table is driven to move along the transverseball guide rail 42, so that the aim of eliminating transverse eccentricity is fulfilled. When longitudinal force is applied to the longitudinal ball sliding table 47, the longitudinal ball sliding table 46 fixed on the bottom surface of the longitudinal ball sliding table is driven to move along the longitudinalball guide rail 45, so that the purpose of eliminating longitudinal eccentricity is achieved.
Claims (7)
1. The utility model provides a gravity compensation arrangement for one-dimensional revolving stage ground test which characterized in that: the air floatation bearing comprises a conical coupling, an air floatation bearing, a pressure sensor and an installation platform;
the stator of the air bearing is connected with the mounting platform, the rotor of the air bearing is provided with a pressure sensor, the pressure sensor is connected with the lower end of the rotor of the one-dimensional rotary table through a conical coupler, and the upper end of the rotor of the one-dimensional rotary table is used for mounting an external load.
2. The gravity compensation device for the ground test of the one-dimensional turntable according to claim 1, wherein: the mounting platform is a three-dimensional moving platform and comprises a lifting mechanism for adjusting the air bearing to move along the vertical direction and a two-dimensional aligning mechanism for adjusting the air bearing to move on the horizontal plane.
3. The gravity compensation device for the ground test of the one-dimensional turntable according to claim 2, wherein: the lifting mechanism comprises a base, supporting legs, a guide rod, a screw and a bottom plate;
a plurality of support legs are arranged below the base;
the number of the guide rods is at least three, the upper ends of the at least three guide rods are fixed on the bottom plate, and the lower ends of the at least three guide rods penetrate through the base and are suspended;
the screw rod is in threaded connection with the base, the upper end of the screw rod is in contact with the bottom plate, the lower end of the screw rod is used as a driving part for the screw rod to rotate, and the screw rod is located among the at least three guide rods.
4. The gravity compensation device for the ground test of the one-dimensional turntable according to claim 3, wherein: the two-dimensional aligning mechanism comprises a transverse sliding table base, a transverse ball guide rail, a transverse ball sliding block, a longitudinal sliding table base, a longitudinal ball guide rail, a longitudinal ball sliding block and a longitudinal ball sliding table;
the two transverse sliding table bases are fixedly arranged on the bottom plate in parallel;
two transverse ball guide rails are arranged between the two transverse sliding table bases;
the two transverse ball guide rails are respectively provided with a transverse ball sliding block;
each transverse ball sliding block is provided with a longitudinal sliding table base;
a longitudinal ball guide rail is arranged between the two longitudinal sliding table bases;
a longitudinal ball sliding block is arranged on the longitudinal ball guide rail; and a longitudinal ball sliding table is arranged on the longitudinal ball sliding block and is connected with the air bearing stator.
5. The gravity compensation device for the ground test of the one-dimensional turntable according to claim 4, wherein: the upper end of the screw rod is a spherical surface.
6. The gravity compensation device for the ground test of the one-dimensional turntable according to claim 5, wherein: and the lower end of the screw rod is provided with a driving motor.
7. The gravity compensation device for the ground test of the one-dimensional turntable according to claim 6, wherein: the shaft end of the conical coupling is arranged on the pressure sensor, and the base end of the conical coupling is arranged at the lower end of the rotor of the one-dimensional rotary table.
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| CN202110832011.6ACN113532900B (en) | 2021-07-22 | 2021-07-22 | A gravity compensation device for one-dimensional turntable ground test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110832011.6ACN113532900B (en) | 2021-07-22 | 2021-07-22 | A gravity compensation device for one-dimensional turntable ground test |
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| CN113532900B CN113532900B (en) | 2025-05-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115290303A (en)* | 2022-07-11 | 2022-11-04 | 中国科学院上海技术物理研究所 | Gravity unloading device for telescope turntable test |
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