One-dimensional pointing precision-adjustable large-mass optical payload gravity unloading device

Abstract

The present invention discloses a one-dimensional pointing precision-adjustable gravity unloading device for a large-mass optical payload, belonging to the fields of optical engineering and precision machinery technology. It includes a fixed base, on which a fixed frame is arranged, and on the fixed frame, a one-dimensional precision rotation mechanism is arranged. The one-dimensional precision rotation mechanism includes a one-dimensional rotating shaft, the one-dimensional rotating shafts are symmetrically arranged in the fixed frame, and a large-mass optical payload is arranged between the two one-dimensional rotating shafts. By adopting the above-mentioned one-dimensional pointing precision-adjustable gravity unloading device for a large-mass optical payload, while realizing the gravity unloading of the large-mass optical payload, it has no influence on the precision pointing adjustment performance of the large-mass optical payload in the one-dimensional direction, so that it can realize the simulation test of the high-precision pointing adjustment performance of the large-mass optical payload on the ground.

Description

Technical Field

[0001] The present invention relates to the fields of optical engineering and precision machinery technology, and particularly relates to a one-dimensional pointing precision adjustable gravity unloading device for a large-mass optical payload. Background Art

[0002] In some typical space application tasks such as space gravitational wave detection and precision optical remote sensing, precision drivers are required to drive a large-mass optical payload to deflect at an angle around a one-dimensional or two-dimensional precision rotating shaft, so as to achieve precise adjustment of the space pointing of the large-mass optical payload in one-dimensional or two-dimensional directions.

[0003] For example, in a typical space gravitational wave detection task, an inter-satellite laser ranging interferometer needs to be formed between multiple satellites to accurately measure the change in the long-distance inter-satellite distance, and then calculate the gravitational wave data; among them, the measurement optical paths of the inter-satellite laser ranging interferometers on each satellite are fixedly connected as a whole large-mass optical payload of about 80 kg, and the pointing of this large mass as a whole needs to be precisely adjusted in two dimensions to achieve the scanning and capturing function of the inter-satellite laser beam and the precise adjustment of the inter-satellite laser beam pointing during the scientific measurement process. The adjustment range of two-dimensional pointing reaches ±5 mrad, and the adjustment sensitivity is better than 10 nrad. In a typical precision optical remote sensing space application task, it is necessary to adjust the pointing direction of a large-mass optical remote sensing camera weighing dozens of kilograms, accurately align it with the target area and maintain the tracking state, and the requirements for pointing alignment and tracking accuracy reach the micro-radian level.

[0004] In the above-mentioned space tasks, after these large-mass optical payloads are put into orbit with the spacecraft and work in a microgravity environment. Therefore, during the process of using a precision driver to drive the large-mass optical payload to deflect at an angle around a one-dimensional or two-dimensional precision rotating shaft, the precision rotating shaft is only affected by the driving force or torque generated by the driver, and is not affected by the gravity of the large-mass optical payload itself. However, the assembly and testing of this type of large-mass optical payload are carried out in the ground gravity environment. In order to test its high-precision pointing adjustment performance from micro-radians to nano-radians around the precision rotating shaft, it is necessary to unload the gravity of the large-mass optical payload in the ground gravity environment to avoid the gravity acting on the precision rotating shaft, and it is necessary to avoid the influence of the gravity unloading device or mechanism on the pointing adjustment performance, so as to ensure that in the ground environment, the high-precision pointing adjustment performance of the large-mass optical payload in the space microgravity environment can be accurately and reliably tested.

[0005] The current gravity unloading methods are divided into two categories: active gravity compensation and passive gravity compensation. Active gravity compensation monitors and adjusts the telescope structure in real time through sensors and actuators to compensate for the changes caused by gravity. It has high compensation accuracy, but the structure is complex and prone to damage, making it unsuitable for space exploration missions. Passive gravity compensation uses springs, pneumatic devices, suspension wires, etc. to partially offset the influence of gravity on the detector, and can be subdivided into the drop tower method, parabola method, water floating method, air floating method, suspension method, etc. The drop tower method and the parabola method make the experimental device perform free fall or horizontal projectile motion to achieve a microgravity environment, with high construction costs and too short a duration of the microgravity environment. The water floating method uses the buoyancy of water to offset the gravity of the space vehicle and can achieve a microgravity environment at any time. The disadvantage is that the experimental equipment needs to be specially waterproofed. The air floating method uses gas to lift the experimental equipment and requires precise control of the flow rate of the ejected air flow, and the equipment processing and installation debugging are relatively troublesome. The suspension method uses suspension wires to lift the experimental equipment and uses the tension of the suspension wires to balance gravity, which is a commonly used method for microgravity simulation. The suspension method uses the tension of the suspension wires to balance the gravity received by the detector. By accurately calculating the position of the suspension wires, the suspension method can provide precise gravity unloading to ensure that the optical components and structure of the optical load do not deform due to gravity. The more the number of suspension wires, the smaller the stress deformation near the connection point of a single suspension wire, but the more complex the suspension system. In the currently commonly used suspension wire system, the number of suspension wires is less than 10. The suspension wire method is a passive support system that does not involve active mechanical components, reduces possible mechanical vibrations and interference, has a simple structure, high reliability, and low maintenance costs.

[0006] However, in tasks such as space gravitational wave detection and precision optical remote sensing, it is required that while performing gravity unloading on a large-mass optical load, the gravity unloading device or mechanism needs to minimally affect the high-precision pointing adjustment performance of the large-mass optical load at the micro-radian to nano-radian level. Among the above existing gravity unloading methods, when considering gravity unloading, the influence of the gravity unloading device or mechanism on the high-precision pointing adjustment performance is not considered, and it cannot meet the application requirements for ground testing of the precision pointing adjustment performance of large-mass optical loads in tasks such as space gravitational wave detection and precision optical remote sensing. Summary of the Invention

[0007] The purpose of the present invention is to provide a gravity unloading device for a large-mass optical load with precisely adjustable one-dimensional pointing to solve the problems mentioned in the background technology.

[0008] To achieve the above purpose, the present invention provides a gravity unloading device for a large-mass optical load with precisely adjustable one-dimensional pointing that performs gravity unloading through steel wire ropes, including a fixed base, a fixed frame is arranged on the fixed base, a one-dimensional precision rotation mechanism is arranged on the fixed frame, the one-dimensional precision rotation mechanism includes a one-dimensional rotating shaft, the one-dimensional rotating shafts are symmetrically arranged inside the fixed frame, and a large-mass optical load is arranged between the two one-dimensional rotating shafts.

[0009] Preferably, a connecting frame is provided on one side of the fixed frame, a precision driver is provided on the connecting frame, and the precision driver is connected to the large-mass optical payload.

[0010] Preferably, the connecting frame is arranged in a "C" shape.

[0011] Preferably, a gravity unloading fixing seat is provided above the fixed frame, and a precision rotating bearing is fixedly sleeved on the top of the gravity unloading fixing seat.

[0012] Preferably, the precision rotating bearing is coaxially arranged with the one-dimensional rotating shaft.

[0013] Preferably, a first steel wire rope and a second steel wire rope are respectively arranged on both sides of the outer wall of the precision rotating bearing, and the bottom ends of the first steel wire rope and the second steel wire rope are both connected to the large-mass optical payload.

[0014] Preferably, both the first steel wire rope and the second steel wire rope are arranged in the plane formed by the axis of the one-dimensional rotating shaft and the optical axis of the large-mass optical payload.

[0015] Preferably, a support cross bar is fixedly connected to the outer wall of the precision rotating bearing, the other end of the support cross bar is connected with a suspension steel wire rope, and the other end of the suspension steel wire rope is connected to the large-mass optical payload.

[0016] Preferably, the arrangement direction of the support cross bar is parallel to the optical axis direction of the large-mass optical payload.

[0017] Preferably, the suspension steel wire rope is located in the vertical line direction of the centroid of the large-mass optical payload.

[0018] Therefore, by adopting the above one-dimensional pointing precision adjustable large-mass optical payload gravity unloading device, the present invention has the following beneficial effects: while realizing the gravity unloading of the large-mass optical payload, it has no influence on the precision pointing adjustment performance of the large-mass optical payload in the one-dimensional direction, so as to be able to simulate and test the high-precision pointing adjustment performance of the large-mass optical payload on the ground.

[0019] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of Embodiment 1 of the present invention;

[0021] Figure 2 It is a top view of Embodiment 1 of the present invention;

[0022] Figure 3Side view of Embodiment 1 of the present invention;

[0023] Figure 4 Schematic diagram of the angular deflection of Embodiment 1 of the present invention in the horizontal direction;

[0024] Figure 5 Schematic diagram of the structure of Embodiment 2 of the present invention;

[0025] Figure 6 Top view of Embodiment 2 of the present invention;

[0026] Figure 7 Side view of Embodiment 2 of the present invention;

[0027] Figure 8 Schematic diagram of the angular deflection of Embodiment 2 of the present invention in the horizontal direction;

[0028] Reference numerals

[0029] 1. Large-mass optical payload; 2. One-dimensional precision rotation mechanism; 3. Precision driver; 4. Fixed frame; 5. Fixed base; 6. Gravity unloading fixed seat; 7. Steel wire rope 1; 8. Precision rotation bearing; 9. Steel wire rope 2; 10. Support crossbar; 11. Suspension steel wire rope; 12. Center of mass; T1 is the tension of the steel wire rope 1 on the large-mass optical payload; T2 is the tension of the steel wire rope 2 on the large-mass optical payload; G is the gravity of the large-mass optical payload; m is the mass of the large-mass optical payload; g is the acceleration due to gravity; α is the angle of deflection of the gravity unloading device in the horizontal direction; T3 is the tension of the suspension steel wire rope on the large-mass optical payload. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] The present invention provides a gravity unloading device for a one-dimensional pointing precision adjustable large-mass optical load that performs gravity unloading through a wire rope, including a fixed base 5. A fixed frame 4 is arranged on the fixed base 5, and a one-dimensional precision rotation mechanism is arranged on the fixed frame 4. The one-dimensional precision rotation mechanism 2 includes a one-dimensional rotating shaft. The one-dimensional rotating shafts are symmetrically arranged within the fixed frame 4, and a large-mass optical load 1 is arranged between the two one-dimensional rotating shafts. The driving point of the precision driver 3 acts on the large-mass optical load 1, and the precision driver 3 generates a driving force to drive the large-mass optical load 1, so that the pointing direction of the large-mass optical load 1 deflects at a high-precision angle around the one-dimensional rotating shaft of the one-dimensional precision rotation mechanism 2.

[0033] A connecting frame is arranged on one side of the fixed frame 4, and the connecting frame is arranged in a "C" shape structure. The precision driver 3 is arranged on the connecting frame, and the precision driver 3 is connected to the large-mass optical load 1.

[0034] A gravity unloading fixed seat 6 is arranged above the fixed frame 4, and a precision rotating bearing 8 is fixedly sleeved on the top of the gravity unloading fixed seat 6. The precision rotating bearing 8 is coaxially arranged with the one-dimensional rotating shaft.

[0035] Embodiment 1

[0036] As Figure 1-4 shown, a wire rope one 7 and a wire rope two 9 are respectively arranged on both sides of the outer wall of the precision rotating bearing 8. The bottom ends of the wire rope one 7 and the wire rope two 9 are both connected to the large-mass optical load 1. The wire rope one 7 and the wire rope two 9 are both arranged in the plane formed by the axis of the one-dimensional rotating shaft and the optical axis of the large-mass optical load 1. The tensile forces of the wire rope one 7 and the wire rope two 9 on the large-mass optical load 1 are balanced with the gravity of the large-mass optical load 1, realizing gravity unloading at the rotating shaft; and, during the process of precisely adjusting the pointing of the large-mass optical load 1, the wire rope one 7 and the wire rope two 9 rotate synchronously around the axis of the one-dimensional rotating shaft following the change of the pointing of the large-mass optical load 1, so that while the wire rope one 7 and the wire rope two 9 realize gravity unloading, they have no influence on the precision pointing adjustment performance of the large-mass optical load 1 in the one-dimensional direction.

[0037] Embodiment 2

[0038] As Figure 5-8As shown, a support crossbar 10 is fixedly connected to the outer wall of the precision rotating bearing 8. The arrangement direction of the support crossbar 10 is parallel to the optical axis direction of the large-mass optical payload 1. The other end of the support crossbar 10 is connected to a suspension wire rope 11, and the other end of the suspension wire rope 11 is connected to the large-mass optical payload 1. The suspension wire rope 11 is located in the vertical line direction of the centroid 12 of the large-mass optical payload 1. The tension of the suspension wire rope 11 on the large-mass optical payload 1 is balanced with the gravity of the large-mass optical payload 1 to achieve gravity unloading at the rotating shaft. Moreover, during the process of precisely adjusting the pointing of the large-mass optical payload 1, the suspension wire rope 11 and the support crossbar 10 rotate synchronously around the one-dimensional rotating shaft axis following the change of the pointing of the large-mass optical payload 1, so that while the suspension wire rope 11 and the support crossbar 10 achieve gravity unloading, they have no impact on the precise pointing adjustment performance of the large-mass optical payload 1 in the one-dimensional direction.

[0039] Therefore, by adopting the above one-dimensional pointing precisely adjustable large-mass optical payload gravity unloading device, while achieving gravity unloading of the large-mass optical payload, it has no impact on the precise pointing adjustment performance of the large-mass optical payload in the one-dimensional direction, thus enabling the simulation test of the high-precision pointing adjustment performance of the large-mass optical payload on the ground.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements do not make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A one-dimensionally pointing, precisely adjustable, large-mass optical load gravity unloading device, characterized in that: Gravity unloading is carried out by means of steel wire ropes, including a fixed base, a fixed frame is arranged on the fixed base, a one-dimensional precision rotating mechanism is arranged on the fixed frame, the one-dimensional precision rotating mechanism includes a one-dimensional rotating shaft, the one-dimensional rotating shaft is symmetrically arranged in the fixed frame, and a large-mass optical load is arranged between the two one-dimensional rotating shafts; A gravity unloading fixed seat is arranged above the fixed frame, and a precision rotating bearing is fixedly sleeved on the top of the gravity unloading fixed seat; The precision rotating bearing is coaxially arranged with the one-dimensional rotating shaft; Steel wire rope one and steel wire rope two are respectively arranged on both sides of the outer wall of the precision rotating bearing, and the bottom ends of the steel wire rope one and the steel wire rope two are both connected to the large-mass optical load; Both the steel wire rope one and the steel wire rope two are arranged in the plane formed by the axis of the one-dimensional rotating shaft and the axis of the visual axis of the large-mass optical load.

2. A one-dimensionally pointing, precisely adjustable, large-mass optical load gravity unloading device, characterized in that: Gravity unloading is carried out by means of steel wire ropes, including a fixed base, a fixed frame is arranged on the fixed base, a one-dimensional precision rotating mechanism is arranged on the fixed frame, the one-dimensional precision rotating mechanism includes a one-dimensional rotating shaft, the one-dimensional rotating shaft is symmetrically arranged in the fixed frame, and a large-mass optical load is arranged between the two one-dimensional rotating shafts; A gravity unloading fixed seat is arranged above the fixed frame, and a precision rotating bearing is fixedly sleeved on the top of the gravity unloading fixed seat; A support cross bar is fixedly connected to the outer wall of the precision rotating bearing, the other end of the support cross bar is connected with a suspension steel wire rope, and the other end of the suspension steel wire rope is connected to the large-mass optical load; The arrangement direction of the support cross bar is parallel to the visual axis direction of the large-mass optical load; The suspension steel wire rope is located in the direction of the plumb line where the centroid of the large-mass optical load is located.

3. The one-dimensionally pointing precisely adjustable large-mass optical load gravity unloading device according to claim 1 or 2, characterized in that: A connecting frame is arranged on one side of the fixed frame, a precision driver is arranged on the connecting frame, and the precision driver is connected to the large-mass optical load.

4. The one-dimensionally pointing precisely adjustable large-mass optical load gravity unloading device according to claim 3 is characterized by: The connecting frame is arranged in a "C" - shaped structure.

Images