High-precision parallel measurement and adjustment integrated device integrated with laser interferometer

Abstract

The invention discloses a high-precision parallel measurement and adjustment integrated device integrated with a laser interferometer, and the device comprises an upper platform which is connected with a space optical load; the lower platform is fixed on the main system truss of the space telescope; the rotating parts are distributed at the bottom of the upper platform and the upper end of the lower platform; the supporting leg mechanisms are connected between the upper platform and the lower platform through rotating parts, and the two ends of each supporting leg mechanism can move based on the rotating parts. According to the high-precision parallel measurement and adjustment integrated device integrated with the laser interferometer, the miniature laser interferometer is used for carrying out real-time pose measurement on the parallel pointing device, errors are compensated through the controller, and the high-precision parallel measurement and adjustment integrated device has great application prospects in the field of improving the imaging quality of a space optical load optical-mechanical structure; compared with the prior art, closed-loop control of the mechanism is completed, the motion precision of the parallel connection device is improved, and meanwhile the pose measurement function of the parallel connection device is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical measurement and adjustment, and in particular to a high-precision parallel measurement and adjustment integrated device with an integrated laser interferometer. Background Art

[0002] In recent years, with the development of research fields such as the structure of the outer Milky Way, the search for solar system objects, and near-field cosmology, the technology and requirements of astronomical observations have been continuously improved. Space optical payloads have become a powerful tool for humans to explore space and study the frontiers of space science.

[0003] Space optical payloads have extremely superior space observation capabilities because they are not affected by ground atmospheric disturbances, absorption and scattering. However, due to the limitations of the measurement and adjustment technology of the optical-mechanical structure of space optical payloads, the imaging capabilities of space optical payloads are also affected. The quality of measurement and adjustment plays a vital role in the future application of the entire optical payload system. The measurement and adjustment of optical payloads is the last stage before telescope imaging. If this part is not effective, the previous work will be meaningless.

[0004] Based on the above technical problems, technicians in this field urgently need to develop a high-precision parallel measurement and adjustment integrated device with a laser interferometer that can improve the imaging quality of the optomechanical structure of the space optical payload, improve the accuracy of the parallel device itself, and meet the high-quality imaging requirements of the space optical payload. Summary of the invention

[0005] The purpose of the present invention is to provide a high-precision parallel measurement and adjustment integrated device with a laser interferometer that can improve the imaging quality of the optomechanical structure of a space optical payload, improve the accuracy of the parallel device itself, and meet the high-quality imaging requirements of the space optical payload.

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

[0007] The high-precision parallel measurement and adjustment integrated device integrated with a laser interferometer of the present invention comprises:

[0008] an upper platform, which is connected to the space optical payload; and

[0009] The lower platform is fixed to the main system truss of the space telescope;

[0010] A plurality of rotating parts are distributed at the bottom of the upper platform and the upper end of the lower platform;

[0011] The integrated device also includes:

[0012] A plurality of leg mechanisms are connected between the upper platform and the lower platform through the rotating component, and both ends of the leg mechanisms can move based on the rotating component.

[0013] Specifically, the upper platform is lightweight and has installation and lifting interfaces with the optical payload.

[0014] Preferably, the rotating component is an offset hinge, and the offset hinge can provide two degrees of freedom of rotation and the rotation directions are perpendicular to each other, and the rotation centers of the equivalent models converge at a point.

[0015] Furthermore, the leg mechanism includes a support seat; and

[0016] A driving part fixed on the support seat;

[0017] A circular grating angular displacement encoder and a transmission part connected to the output end of the driving part, wherein one end of the transmission part away from the driving part is connected to a bearing part, and the transmission part includes a pulley sealing cover;

[0018] A lower leg outer cylinder fixed to the support seat by screws;

[0019] An upper leg outer cylinder connected to the lower leg outer cylinder, wherein the lower leg outer cylinder and the upper leg outer cylinder form a receiving cavity, and the bearing portion is located in the receiving cavity;

[0020] A micro laser interferometer and a diffraction mirror fixed on the pulley sealing cover;

[0021] A reflector connected to the upper leg outer tube via a reflector fixing plate;

[0022] An offset hinge shaft pressure plate is connected to the outer tube of the upper leg by screws.

[0023] Furthermore, the driving part includes a stepping motor sealing cover fixed on the supporting seat; and

[0024] A stepper motor sealing cover connected to the stepper motor sealing cover by screws;

[0025] The stepper motor is arranged inside the stepper motor sealing cover and connected to the support seat, and the circular grating angular displacement encoder and the transmission part are both connected to the output shaft of the stepper motor.

[0026] Furthermore, the transmission part further comprises two pulleys, the two pulleys are connected by a belt, and the two pulleys are respectively connected to the driving part and the bearing part;

[0027] A pulley sealing cover is connected to the pulley sealing cover, and one end of the pulley sealing cover away from the pulley sealing cover is connected to the support seat through a screw.

[0028] Furthermore, the bearing portion includes a planetary roller screw connected to the transmission portion, and the planetary roller screw is connected to the support seat through a ball bearing, a bearing gland and a bearing gasket;

[0029] A planetary roller screw nut connected to the outer cylinder of the upper leg via a screw.

[0030] In the above technical solution, the high-precision parallel measurement and adjustment integrated device with integrated laser interferometer provided by the present invention has the following beneficial effects:

[0031] The high-precision parallel measurement and adjustment integrated device with an integrated laser interferometer of the present invention uses a micro laser interferometer to perform real-time posture measurement of a parallel pointing device and compensates for errors through a controller, and has great application prospects in the field of improving the imaging quality of optomechanical structures of space optical loads. Compared with the prior art, it completes the closed-loop control of the mechanism, thereby improving the motion accuracy of the parallel device, and at the same time realizes the posture measurement function of the parallel device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 A schematic diagram of the overall structure of a high-precision parallel measurement and adjustment integrated device integrated with a laser interferometer provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the structure of an offset hinge in a high-precision parallel measurement and adjustment integrated device with an integrated laser interferometer provided in an embodiment of the present invention;

[0035] Figure 3 An equivalent schematic diagram of an offset hinge of a high-precision parallel measurement and adjustment integrated device integrated with a laser interferometer provided in an embodiment of the present invention;

[0036] Figure 4 A cross-sectional view of a leg mechanism in a high-precision parallel measurement and adjustment integrated device integrated with a laser interferometer provided in an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of the principle of the measuring part in the leg mechanism of the high-precision parallel measurement and adjustment integrated device integrated with a laser interferometer provided in an embodiment of the present invention.

[0038] Description of reference numerals:

[0039] 1. Upper platform; 2. Offset hinge; 3. Outrigger mechanism; 4. Lower platform;

[0040] 31. driving part; 32. transmission part; 33. bearing part;

[0041] 3-1, stepper motor sealing cover; 3-2, stepper motor sealing cover; 3-3, stepper motor; 3-4, circular grating angular displacement encoder; 3-5, support seat; 3-6, pulley; 3-7, belt; 3-8, micro laser interferometer; 3-9, pulley sealing cover; 3-10, pulley sealing cover; 3-11, diffraction mirror; 3-12, bearing gasket; 3-13, bearing pressure cover; 3-14, ball bearing; 3-15, lower leg outer cylinder; 3-16, planetary roller screw nut; 3-17, planetary roller screw; 3-18, upper leg outer cylinder; 3-19, reflector; 3-20, reflector fixing plate; 3-21, offset hinge shaft pressure plate. DETAILED DESCRIPTION

[0042] 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.

[0043] See also Figure 1 to Figure 5 As shown;

[0044] The high-precision parallel measurement and adjustment integrated device integrated with a laser interferometer of the present invention comprises:

[0045] The upper platform 1 is connected to the space optical payload. At the same time, the optical payload can penetrate into the adjustment platform and can be integrated with the upper platform 1, thereby reducing the center of mass of the moving parts and improving the rigidity of the moving mechanism, thereby meeting the application of the parallel mechanism in special cases; and

[0046] The lower platform 4 is fixed on the main system truss of the space telescope;

[0047] A plurality of rotating parts are distributed at the bottom of the upper platform 1 and the upper end of the lower platform 4;

[0048] The integrated device also includes:

[0049] The plurality of leg mechanisms 3 are connected between the upper platform 1 and the lower platform 4 via the rotating component, and both ends of the leg mechanisms 3 can move based on the rotating component.

[0050] In order to meet the requirements of high rigidity and large working space of the joint hinge, and as a preferred technical solution of this embodiment, the rotating component is an offset hinge 2, and the offset hinge 2 can provide two degrees of freedom rotation and the rotation directions are perpendicular to each other, and the equivalent model rotation axes are perpendicular but not intersecting.

[0051] As a further introduction to this embodiment, the leg mechanism 3 includes a support seat 3-5; and

[0052] A driving part 31 fixed on the support seat 3-5;

[0053] A circular grating angular displacement encoder 3-4 and a transmission part 32 connected to the output end of the driving part 31, wherein one end of the transmission part 32 away from the driving part 31 is connected to a bearing part 33, and the transmission part 32 includes a pulley sealing cover 3-9;

[0054] A lower leg outer cylinder 3-15 fixed to the support seat 3-5 by screws;

[0055] An upper leg outer cylinder 3-18 connected to the lower leg outer cylinder 3-15, wherein the lower leg outer cylinder 3-15 and the upper leg outer cylinder 3-18 form an accommodating cavity, and the bearing portion 33 is located in the accommodating cavity;

[0056] A micro laser interferometer 3-8 and a diffraction mirror 3-11 fixed on the pulley sealing cover 3-9;

[0057] A reflector 3-19 connected to the upper leg outer tube 3-18 via a reflector fixing plate 3-20;

[0058] An offset hinge shaft pressure plate 3-21 is connected to the upper leg outer tube 3-18 by screws.

[0059] As a further introduction to this embodiment, the driving unit 31 includes a stepping motor sealing cover 3-2 fixed on the supporting seat 3-5; and

[0060] A stepper motor sealing cover 3-1 connected to the stepper motor sealing cover 3-2 by screws;

[0061] The stepper motor 3-3 is arranged inside the stepper motor sealing cover 3-2 and connected to the support seat 3-5, and the circular grating angular displacement encoder 3-4 and the transmission part 32 are both connected to the output shaft of the stepper motor 3-3.

[0062] As a further introduction to this embodiment, the transmission part 32 further includes two pulleys 3-6, the two pulleys 3-6 are connected by a belt 3-7, and the two pulleys 3-6 are respectively connected to the driving part 31 and the bearing part 33;

[0063] The pulley sealing cover 3-10 is connected to the pulley sealing cover 3-9, and one end of the pulley sealing cover 3-10 away from the pulley sealing cover 3-9 is connected to the support seat 3-5 by screws.

[0064] As a further introduction to this embodiment, the bearing portion 33 includes a planetary roller screw 3-17 connected to the transmission portion 32, and the planetary roller screw 3-17 is connected to the support seat 3-5 through a ball bearing 3-14, a bearing gland 3-13 and a bearing gasket 3-12;

[0065] A planetary roller screw nut 3-16 connected to the upper leg outer tube 3-18 by screws.

[0066] In this embodiment, the specific transmission mode of the leg mechanism 3 is as follows:

[0067] The stepper motor 3-3 drives the pulley 3-6 to rotate, and the pulley 3-6 drives another pulley 3-6 to rotate through the belt 3-7, and the rotation of the pulley 3-6 drives the roller screw 3-17 to rotate, and the rotation of the roller screw 3-17 drives the movement of the ball screw nut 3-16, thereby pushing the upper platform 1 to move. Since the ball screw nut 3-16 is fixed to the upper leg outer cylinder 3-18, the rotational movement of the ball screw 3-17 is converted into the rotation of the upper leg outer cylinder 3-18. The mechanism is a guideless roller screw nut mechanism that can realize the motion of rotational and translational coupling, and the transmission relationship of the coupled motion is the lead of the planetary roller screw 3-17. The measurement method of the leg mechanism 3 is that the movement of the upper leg outer cylinder 3-18 drives the movement of the reflector 3-19, so that the micro laser interferometer 3-8 can measure the upper leg movement distance in real time through the diffraction mirror 3-11 and the reflector 3-19.

[0068] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-precision parallel measurement and adjustment integrated device integrated with a laser interferometer, characterized in that: The integrated device includes: an upper platform (1) connected to the space optical payload; and A lower platform (4) is fixed on the main system truss of the space telescope; A plurality of rotating parts are distributed at the bottom of the upper platform (1) and the upper end of the lower platform (4); The integrated device also includes: A plurality of leg mechanisms (3) are connected between the upper platform (1) and the lower platform (4) via the rotating component, and both ends of the leg mechanisms (3) are capable of moving based on the rotating component.

2. The high-precision parallel measurement and adjustment integrated device with integrated laser interferometer according to claim 1, characterized in that: The rotating component is an offset hinge (2), and the offset hinge (2) can provide two degrees of freedom of rotation, and the rotation directions are perpendicular to each other.

3. The high-precision parallel measurement and adjustment integrated device with integrated laser interferometer according to claim 1, characterized in that: The leg support mechanism (3) comprises a support seat (3-5); and A driving part (31) fixed on the supporting seat (3-5); A circular grating angular displacement encoder (3-4) and a transmission part (32) connected to the output end of the driving part (31), wherein one end of the transmission part (32) away from the driving part (31) is connected to a bearing part (33), and the transmission part (32) includes a pulley sealing cover (3-9); A lower leg outer cylinder (3-15) fixed to the support seat (3-5) by screws; an upper leg outer cylinder (3-18) connected to the lower leg outer cylinder (3-15), wherein the lower leg outer cylinder (3-15) and the upper leg outer cylinder (3-18) form an accommodating cavity, and the bearing portion (33) is located in the accommodating cavity; A micro laser interferometer (3-8) and a diffraction mirror (3-11) fixed on the pulley sealing cover (3-9); A reflector (3-19) connected to the upper leg outer cylinder (3-18) via a reflector fixing plate (3-20); An offset hinge shaft pressure plate (3-21) is connected to the upper leg outer tube (3-18) via screws.

4. The high-precision parallel measurement and adjustment integrated device with integrated laser interferometer according to claim 3, characterized in that: The driving part (31) comprises a stepping motor sealing cover (3-2) fixed on the supporting seat (3-5); and A stepper motor sealing cover (3-1) connected to the stepper motor sealing cover (3-2) via screws; A stepper motor (3-3) is arranged inside the stepper motor sealing cover (3-2) and connected to the support seat (3-5), and the circular grating angular displacement encoder (3-4) and the transmission part (32) are both connected to the output shaft of the stepper motor (3-3).

5. The high-precision parallel measurement and adjustment integrated device with integrated laser interferometer according to claim 3, characterized in that: The transmission part (32) further comprises two pulleys (3-6), the two pulleys (3-6) are connected via a belt (3-7), and the two pulleys (3-6) are respectively connected to the driving part (31) and the bearing part (33); A pulley sealing cover (3-10) is connected to the pulley sealing cover (3-9), and one end of the pulley sealing cover (3-10) away from the pulley sealing cover (3-9) is connected to the support seat (3-5) via a screw.

6. The high-precision parallel measurement and adjustment integrated device with integrated laser interferometer according to claim 3, characterized in that: The bearing part (33) comprises a planetary roller screw (3-17) connected to the transmission part (32), and the planetary roller screw (3-17) is connected to the support seat (3-5) via a ball bearing (3-14), a bearing cover (3-13) and a bearing gasket (3-12); A planetary roller screw nut (3-16) connected to the upper leg outer cylinder (3-18) via screws.

Images