High-precision rotary table for testing large-aperture spatial load

Abstract

The invention discloses a high-precision rotary table for testing a large-aperture spatial load, and relates to the technical field of spatial load testing equipment, the high-precision rotary table comprises a base, a driving shaft supporting assembly, a driven shaft supporting assembly and a bearing assembly, the driving shaft supporting assembly is arranged at one end of the top surface of the base; the driven shaft supporting assembly is arranged at the other end of the top face of the base. The two ends of the bearing assembly are connected with the driving shaft supporting assembly and the driven shaft supporting assembly correspondingly. The driving shaft supporting assembly comprises a driving shaft, a direct-current torque motor is installed on a shaft shoulder of the driving shaft, the driving shaft is rotationally arranged on the top of a driving shaft supporting frame, the driving shaft supporting frame is installed on the base, and the output end of the driving shaft is connected with the bearing assembly. The rotary table is directly driven by the direct-current torque motor, intermediate transmission links such as a speed reducer are not needed, and the overall motion precision of the rotary table is relatively high; and a 26-bit high-precision encoder is adopted, and 1000-time subdivision is adopted for feeding back an angular position, so that the positioning precision of the rotary table is relatively high.

Description

Technical Field

[0001] The invention relates to the technical field of space load testing equipment, and in particular to a high-precision turntable for testing large-caliber space loads. Background Art

[0002] Space optical payload refers to the optical equipment carried by spacecraft, which is one of the main payloads of deep space exploration spacecraft, including infrared imaging instruments, infrared spectrometers, visible light imaging instruments, visible light spectrometers, ultraviolet imaging instruments, laser rangefinders, laser radars, etc. For example, the Hubble Telescope (HST), the world's most outstanding astronomical telescope, carries a variety of optical payloads, as well as the "Fengyun" meteorological satellite, "Haiyang No. 1" ocean satellite, "Chang'e No. 1" lunar exploration satellite launched by my country, all carry a variety of space optical payloads.

[0003] Large-aperture optical payloads need to undergo a series of tests before leaving the factory, and some tests require the optical payload to be flipped. Therefore, flip tests for large-aperture optical payloads are often difficult. Turntables that carry large-aperture optical payloads must have the characteristics of large carrying capacity, large overall size, high precision, and high speed stability. However, it is difficult for turntables on the market to take all of the above characteristics into account. The pointing accuracy and speed stability of existing large turntables are often low, and small turntables are difficult to carry large-aperture space payloads.

[0004] Therefore, those skilled in the art provide a high-precision turntable for testing large-caliber space loads to solve the problems raised in the above-mentioned background technology. Summary of the invention

[0005] The invention provides a high-precision turntable for testing a large-aperture space load, which can carry a large-aperture space optical load for flipping test.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A high-precision turntable for testing large-caliber space loads of the present invention comprises:

[0008] Base;

[0009] A driving shaft support assembly, wherein the driving shaft support assembly is arranged at one end of the top surface of the base;

[0010] A driven shaft support assembly, the driven shaft support assembly being arranged at the other end of the top surface of the base;

[0011] A bearing assembly, the two ends of which are respectively connected to the driving shaft support assembly and the driven shaft support assembly;

[0012] The active shaft support assembly includes an active shaft, a DC torque motor is installed on the shoulder of the active shaft, the active shaft is rotatably arranged on the top of the active shaft support frame, the active shaft support frame is installed on the base, and the output end of the active shaft is connected to the bearing assembly.

[0013] Furthermore, one end of the driving shaft close to the bearing assembly is connected to the driving shaft support frame through a tapered roller bearing.

[0014] Furthermore, one end of the driving shaft away from the bearing assembly is connected to the driving shaft support frame through an angular contact bearing.

[0015] Furthermore, the driven shaft support assembly includes a driven shaft, which is rotatably arranged on the top of a driven shaft support frame, the driven shaft support frame is installed on a base, one end of the driven shaft is connected to the bearing assembly, and the other end of the driven shaft is connected to an encoder.

[0016] Furthermore, the end of the driven shaft close to the bearing assembly is connected to the driven shaft support frame through an angular contact bearing.

[0017] Furthermore, the end of the driven shaft close to the encoder is connected to the driven shaft support frame through a deep groove ball bearing.

[0018] Furthermore, the bearing assembly includes a bearing platform, and a driving shaft side plate and a driven shaft side plate are respectively installed at both ends of the bearing platform, and the driving shaft side plate and the driven shaft side plate are both located on the same side of the bearing platform and are both arranged perpendicular to the bearing platform; the end of the driving shaft side plate away from the bearing platform is connected to the driving shaft, and the end of the driven shaft side plate away from the bearing platform is connected to the driven shaft.

[0019] Furthermore, the bottom corners of the base are provided with feet.

[0020] In the above technical solution, the present invention provides a high-precision turntable for testing large-caliber space loads, which has the following beneficial effects:

[0021] 1. The present application is directly driven by a DC torque motor and does not require an intermediate transmission link such as a reducer (intermediate reduction links such as reducers not only reduce transmission efficiency, but also reduce motion accuracy due to the existence of transmission gaps in the mechanical transmission mechanism). Therefore, the motion accuracy of the turntable is relatively high.

[0022] 2. This application uses a 26-bit high-precision encoder with 1000-fold subdivision to feedback the angular position, so the turntable positioning accuracy is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 A front view of a high-precision turntable for testing large-caliber space loads provided by an embodiment of the present invention;

[0025] Figure 2 A top view of a high-precision turntable for testing large-caliber space loads provided in an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 10. Base; 11. Footing;

[0028] 20. Active shaft support assembly; 21. Active shaft; 22. DC torque motor; 23. Active shaft support frame; 24. Tapered roller bearing; 25. Angular contact bearing;

[0029] 30. Driven shaft support assembly; 31. Driven shaft; 32. Driven shaft support frame; 33. Encoder; 34. Angular contact bearing; 35. Deep groove ball bearing;

[0030] 40. Load-bearing assembly; 41. Load-bearing platform; 42. Driving shaft side plate; 43. Driven shaft side plate. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] See also Figure 1-2 As shown;

[0033] A high-precision turntable for testing large-caliber space loads according to an embodiment of the present invention comprises:

[0034] Base 10;

[0035] A driving shaft support assembly 20, wherein the driving shaft support assembly 20 is disposed at one end of the top surface of the base 10;

[0036] A driven shaft support assembly 30, wherein the driven shaft support assembly 30 is disposed at the other end of the top surface of the base 10;

[0037] A bearing assembly 40, wherein two ends of the bearing assembly 40 are respectively connected to the driving shaft support assembly 20 and the driven shaft support assembly 30;

[0038] The active shaft support assembly 20 includes an active shaft 21, a DC torque motor 22 is installed on the shoulder of the active shaft 21, the active shaft 21 is rotatably arranged on the top of an active shaft support frame 23, the active shaft support frame 23 is installed on the base 10, and the output end of the active shaft 21 is connected to the bearing assembly 40.

[0039] The DC torque motor 22 of the present application is directly connected to the driving shaft 21, that is, the DC torque motor 22 directly drives the driving shaft 21 to rotate, and there is no need for an intermediate transmission link such as a reducer (intermediate reduction links such as reducers not only reduce the transmission efficiency, but also the mechanical transmission mechanism has a transmission gap, which will cause the motion accuracy to be reduced). Therefore, the motion accuracy of the turntable is relatively high.

[0040] Furthermore, one end of the driving shaft 21 close to the bearing assembly 40 is connected to the driving shaft support frame 23 through a tapered roller bearing 24 .

[0041] Furthermore, one end of the driving shaft 21 away from the bearing assembly 40 is connected to the driving shaft support frame 23 via an angular contact bearing 25 .

[0042] The two ends of the driving shaft 21 are rotationally connected to the driving shaft support frame 23 through tapered roller bearings 24 and angular contact bearings 25 respectively, so that the DC torque motor 22 can drive the driving shaft 21 to rotate along its own axis on the driving shaft support frame 23.

[0043] Furthermore, the driven shaft support assembly 30 includes a driven shaft 31, which is rotatably arranged on the top of a driven shaft support frame 32, and the driven shaft support frame 32 is installed on the base 10. One end of the driven shaft 31 is connected to the bearing assembly 40, and the other end of the driven shaft 31 is connected to the encoder 33.

[0044] The encoder 33 uses a 26-bit high-precision encoder with 1000 times subdivision to feedback the angular position. When the active shaft 32 drives the driven shaft 31 to rotate through the bearing assembly 40, the encoder 33 can determine the position of the turntable, thereby improving the positioning accuracy of the turntable.

[0045] Furthermore, the end of the driven shaft 31 close to the bearing assembly 40 is connected to the driven shaft support assembly 32 through a pair of angular contact bearings 34 .

[0046] Furthermore, the end of the driven shaft 31 close to the encoder 33 is connected to the driven shaft support frame 32 through a deep groove ball bearing 35 .

[0047] The two ends of the driven shaft 31 are rotationally connected to the driven shaft support frame 32 through deep groove ball bearings 35 and paired angular contact bearings 34, respectively, so that the DC torque motor 22 can drive the driving shaft 21, and then drive the driven shaft 31 to rotate along its own axis on the driven shaft support frame 32 through the bearing assembly 40.

[0048] Furthermore, the bearing assembly 40 includes a bearing platform 41, and a driving shaft side plate 42 and a driven shaft side plate 43 are respectively installed at both ends of the bearing platform 41. The driving shaft side plate 42 and the driven shaft side plate 43 are both located on the same side of the bearing platform 41 and are both arranged perpendicular to the bearing platform 41; the end of the driving shaft side plate 42 away from the bearing platform 41 is connected to the driving shaft 21, and the end of the driven shaft side plate 43 away from the bearing platform 41 is connected to the driven shaft 31.

[0049] Furthermore, the bottom corners of the base 10 are provided with feet 11 .

[0050] The feet 11 are connected to the base 10 by screws to support the entire turntable.

[0051] When in use, the main shaft support assembly 20 and the driven shaft support assembly 30 are connected to the base 10 by screws to form the whole machine frame and carry the whole machine and the load. The angular contact bearing 25, the DC torque motor 22, the tapered roller bearing 24 and the driving shaft 21 together form the driving shaft system, wherein the angular contact bearing 25 and the tapered roller bearing 24 are transitionally matched with the driving shaft 21 and the driving shaft support frame 23 to form a supporting driving shaft system, which is installed by thermal installation. The DC torque motor 22 is connected to the driving shaft 21 by screws to output the motion for the whole machine. The paired angular contact bearings 34, the deep groove ball bearings 35, the driven shaft 31 and the encoder 33 together form the driven shaft system, wherein the paired angular contact bearings 34 and the deep groove ball bearings 35 are transitionally matched with the driven shaft 31 and the driven shaft support frame 32 to form a supporting driven shaft system, which is also installed by thermal installation. The encoder 33 is connected to the driven shaft 31 by screws and is a motion feedback element that feedbacks the angular displacement of the turntable. The carrying platform 41 is an optical load carrying platform, which is connected to the driving shaft 21 and the driven shaft 31 by screws with the main shaft side plate 42 and the driven shaft side plate 43. The carrying platform 41 can also be used as an intermediate bridge for transmitting the motion of the driving shaft 21 to the driven shaft 31.

[0052] This application can be applied to large-aperture optical payloads for field imaging, field of view angle and other tests.

[0053] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-precision turntable for testing large-caliber space loads, characterized in that: include: Base (10); A driving shaft support assembly (20), wherein the driving shaft support assembly (20) is arranged at one end of the top surface of the base (10); A driven shaft support assembly (30), wherein the driven shaft support assembly (30) is arranged at the other end of the top surface of the base (10); A bearing assembly (40), wherein two ends of the bearing assembly (40) are respectively connected to the driving shaft support assembly (20) and the driven shaft support assembly (30); The active shaft support assembly (20) comprises an active shaft (21), a DC torque motor (22) is mounted on the shaft shoulder of the active shaft (21), the active shaft (21) is rotatably arranged on the top of an active shaft support frame (23), the active shaft support frame (23) is mounted on a base (10), and the output end of the active shaft (21) is connected to the bearing assembly (40).

2. A high-precision turntable for testing large-caliber space loads according to claim 1, characterized in that: One end of the driving shaft (21) close to the bearing assembly (40) is connected to the driving shaft support frame (23) via a tapered roller bearing (24).

3. A high-precision turntable for testing large-caliber space loads according to claim 2, characterized in that: One end of the driving shaft (21) away from the bearing assembly (40) is connected to the driving shaft support frame (23) via an angular contact bearing (25).

4. The high-precision turntable for testing large-caliber space loads according to claim 1, characterized in that: The driven shaft support assembly (30) comprises a driven shaft (31), wherein the driven shaft (31) is rotatably arranged on the top of a driven shaft support frame (32), wherein the driven shaft support frame (32) is mounted on a base (10), wherein one end of the driven shaft (31) is connected to a bearing assembly (40), and the other end of the driven shaft (31) is connected to an encoder (33).

5. A high-precision turntable for testing large-caliber space loads according to claim 4, characterized in that: The end of the driven shaft (31) close to the bearing assembly (40) is connected to the driven shaft support frame (32) via a pair of angular contact bearings (34).

6. A high-precision turntable for testing large-caliber space loads according to claim 5, characterized in that: The end of the driven shaft (31) close to the encoder (33) is connected to the driven shaft support frame (32) via a deep groove ball bearing (35).

7. The high-precision turntable for testing large-caliber space loads according to claim 1, characterized in that: The bearing assembly (40) comprises a bearing platform (41), and a driving shaft side plate (42) and a driven shaft side plate (43) are respectively installed at both ends of the bearing platform (41), and the driving shaft side plate (42) and the driven shaft side plate (43) are both located on the same side of the bearing platform (41) and are both arranged perpendicular to the bearing platform (41); the end of the driving shaft side plate (42) away from the bearing platform (41) is connected to the driving shaft (21), and the end of the driven shaft side plate (43) away from the bearing platform (41) is connected to the driven shaft (31).

8. The high-precision turntable for testing large-caliber space loads according to claim 1, characterized in that: The bottom corners of the base (10) are provided with feet (11).

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