CN114895460B

CN114895460B - Protective door mechanism for space optical system

Info

Publication number: CN114895460B
Application number: CN202210536961.9A
Authority: CN
Inventors: 唐德栋; 刘浩; 程超
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2023-09-19
Anticipated expiration: 2042-05-18
Also published as: CN114895460A

Abstract

The invention discloses a protection door mechanism for a space optical system, and belongs to the technical field of space optics. The device comprises an opening and closing mechanism, a protective door and a light shield cylinder body, wherein the opening and closing mechanism comprises a spring connecting seat, a spring, a first motor mounting seat, a sliding seat, an electric cylinder, a first connecting rod, an electric cylinder rod, a fork-shaped joint, a supporting shaft, a second connecting rod, a second motor, a tensioning rope, a sliding block, a guide rail, a wheel shaft, a brake, a limiting base and a second motor mounting seat. The opening and closing mechanism can realize the opening and closing functions of the protection door under the normal condition and the fault condition of the device. The invention has the characteristics of high reliability, compact structure, stable operation and the like.

Description

Protective door mechanism for space optical system

Technical Field

The invention belongs to the technical field of spacecraft control and structure, and particularly relates to a protection door mechanism for a space optical system.

Background

The navigation sensor is a high-precision detector applied to satellite navigation, is a key device for measuring the attitude of a spacecraft, and the imaging quality of an optical system is a key factor for determining the navigation detection precision. The severe environment in the space, including direct sunlight, space radiation, dust, etc., can seriously affect the imaging quality once entering the inside of the optical system. In order to prevent various adverse external factors from affecting the imaging quality of the optical system, the prior art designs a cylindrical or expandable light shield in the optical system, and improves the imaging quality of the optical system by adding a stray light eliminating coating on the inner wall of the light shield. However, the cylindrical or expandable light shield designed in the prior art cannot block all stray light or dust from entering the optical system. In addition, as the on-orbit running time increases, a large amount of dust is adsorbed on the inner wall of the light shield, so that the light absorptivity of the stray light eliminating coating on the inner wall of the light shield is reduced, and the imaging quality of the optical system is still affected. There are few solutions to this problem in the presently disclosed technology.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to design a protective door mechanism for a space optical system, which is covered by a baffle plate when the optical system does not work, so that dust and stray light are prevented from entering the inner wall of a light shield, and the imaging quality of the space optical system is ensured.

In order to achieve the above purpose, the technical scheme of the invention is as follows:

a protection door mechanism for a space optical system comprises an opening and closing mechanism, a protection door and a light shield cylinder. The opening and closing mechanism comprises a spring connecting seat, a spring, a first motor mounting seat, a sliding seat, an electric cylinder, a first connecting rod, an electric cylinder rod, a fork-shaped joint, a supporting shaft, a second connecting rod, a second motor, a tensioning rope, a sliding block, a guide rail, a wheel shaft, a brake, a limiting base and a second motor mounting seat.

The spring connecting seat is fixedly connected with the mounting base, the spring is a hook spring, one end of the spring hooks the spring connecting seat, and the other end of the spring hooks a spring connecting hole of the sliding seat. The first motor is fixedly connected with the first motor mounting seat, the first motor mounting seat is of a U-shaped structure, the first motor mounting seat is hinged with the sliding seat, the sliding seat is fixedly connected with the sliding blocks, the number of the guide rails is two and symmetrically arranged on the mounting base, two sliding blocks are arranged on each guide rail, the sliding blocks and the guide rails form a moving pair, and the guide rails are fixedly connected with the mounting base.

The electric cylinder rod is hinged to the supporting shaft through a fork-shaped connector, the number of the first connecting rods is two, one end of the first connecting rods is hinged to the supporting lug base II, the other end of the first connecting rods is hinged to the supporting shaft, the number of the second connecting rods is two, one end of the second connecting rods is hinged to the connecting lug base II, and the other end of the second connecting rods is hinged to the supporting shaft.

The number of the limiting bases is two, the number of the motors is two, each limiting base is fixedly connected with the supporting lug seat I through a bolt, the installation angle of the limiting base is adjusted, the maximum opening angle value of the protection door can be limited, each motor is fixedly connected with the motor mounting seat, the motor mounting seat is fixedly connected with the limiting base, the output shaft of the motor is coaxially connected with the wheel shaft, the tensioning rope is wound on the wheel shaft, the extending end of the tensioning rope is fixed on the rope penetrating hole of the sliding seat, the sliding seat is tensioned through the tensioning rope, the brake is fixedly connected with the limiting base, and the two rope penetrating holes are symmetrically arranged on the sliding seat.

The protection door includes: the novel connecting device comprises a cover body, two pairs of connecting lug seats I and two pairs of connecting lug seats II, wherein the connecting lug seats I and the connecting lug seats II are fixedly connected with the cover body. The protection door is made of aluminum alloy materials with smaller density, and the surface of the cover body is sprayed with black paint with high absorptivity, so that stray light radiation can be reduced.

The lens hood barrel includes: the novel portable electric power tool comprises a barrel body, a mounting base, supporting ear seats I and supporting ear seats II, wherein the number of the supporting ear seats I is two, the number of the supporting ear seats II is two, and the mounting base, the supporting ear seats I and the supporting ear seats II are fixedly connected with the barrel body.

The beneficial effects of the invention are as follows:

the invention has compact structure, stable operation and convenient control, and effectively ensures the imaging quality of the space optical system. The invention can effectively ensure the opening and closing of the protection door under the normal condition of the device and under the fault condition caused by the damage of the electric cylinder and the like. The situation that the space optical system cannot work normally due to the fact that the protective door cannot be opened when faults occur is avoided, and the working reliability of the protective door mechanism is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is an isometric view of the present invention in a closed position;

FIG. 3 is a front view of the present invention in a closed position;

FIG. 4 is a top view of the present invention in a closed position;

FIG. 5 is an enlarged view of a portion of FIG. 4A in accordance with the present invention;

FIG. 6 is a schematic view of a sliding seat according to the present invention;

FIG. 7 is a schematic view of a lens hood barrel structure according to the present invention;

FIG. 8 is a schematic view of a protective door according to the present invention;

FIG. 9 is a schematic view of a half-open state of a protection door under normal conditions of the present invention;

FIG. 10 is a schematic view of a fully opened state of a door under normal conditions of the present invention;

FIG. 11 is a schematic view of a half-open state of a protection door in the event of a failure in accordance with the present invention;

FIG. 12 is a schematic view showing the fully opened state of the protection door in the case of failure according to the present invention

Reference numerals illustrate:

1-opening and closing mechanism, 2-protection door, 3-light shield cylinder, 101-spring connecting seat, 102-spring, 103-motor one, 104-motor one installation seat, 105-sliding seat, 105-1-rope threading hole, 105-2-spring connecting hole, 106-electric cylinder, 107-connecting rod one, 108-electric cylinder rod, 109-fork type joint, 110-supporting shaft, 111-connecting rod two, 112-motor two, 113-tensioning rope, 114-sliding block, 115-guide rail, 116-wheel axle, 117-brake, 118-limit base, 119-motor two installation seat, 21-cover body, 22-connecting lug seat I, 23-connecting lug seat II, 31-supporting lug seat I, 32-supporting lug seat II, 33-cylinder body and 34-installation base

Detailed Description

The specific structure and operation of the present invention will be described in detail below with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.

As shown in fig. 1 to 8, a protection door mechanism for a space optical system includes an opening and closing mechanism 1, a protection door 2 and a hood cylinder 3, wherein the opening and closing mechanism 1 includes a spring connection seat 101, a spring 102, a motor one 103, a motor one mounting seat 104, a sliding seat 105, an electric cylinder 106, a link one 107, an electric cylinder rod 108, a fork joint 109, a support shaft 110, a link two 111, a motor two 112, a tension rope 113, a slider 114, a guide rail 115, a wheel shaft 116, a brake 117, a limit base 118 and a motor two mounting seat 119.

The spring connecting seat 101 is fixedly connected with the mounting base 34, the spring 102 is a hook spring, one end of the spring 102 hooks the spring connecting seat 101, and the other end of the spring 102 hooks the spring connecting hole 105-2 of the sliding seat 105. The first motor 103 is fixedly connected with the first motor mounting seat 104, the first motor mounting seat 104 is of a U-shaped structure, the first motor mounting seat 104 is hinged to the sliding seat 105, the sliding seat 105 is fixedly connected with the sliding blocks 114, the number of the guide rails 115 is two and symmetrically arranged on the mounting base 34, two sliding blocks 114 are arranged on each guide rail 115, the sliding blocks 114 and the guide rails 115 form a moving pair, and the guide rails 115 are fixedly connected with the mounting base 34.

The electric cylinder rod 108 is hinged to the supporting shaft 110 through a fork-shaped connector 109, the number of the first connecting rods 107 is two, one end of the first connecting rod 107 is hinged to the supporting ear seat II 32, and the other end of the first connecting rod 107 is hinged to the supporting shaft 110; the number of the second connecting rods 111 is two, one end of the second connecting rod 111 is hinged to the connecting lug seat II 23, and the other end of the second connecting rod 111 is hinged to the supporting shaft 110.

The number of the limiting bases 118 is two, each limiting base 118 is fixedly connected with the supporting lug base I31 through bolts, each motor 112 is fixedly connected with the motor mounting base 119, the motor mounting base 119 is fixedly connected with the limiting bases 118, an output shaft of the motor 112 is coaxially connected with the wheel shaft 116, the tensioning rope 113 is wound on the wheel shaft 116, the extending end of the tensioning rope 113 is fixed on the rope penetrating hole 105-1 of the sliding base 105, the sliding base 105 is tensioned through the tensioning rope 113, the brake 117 is fixedly connected with the limiting bases 118, and the sliding base 105 is symmetrically provided with the two rope penetrating holes 105-1.

The protection door 2 comprises a cover body 21, two connecting lug seats I22 and two connecting lug seats II 23, wherein the number of the connecting lug seats I22 is two, the number of the connecting lug seats II 23 is two, and the connecting lug seats I22 and II 23 are fixedly connected with the cover body 21. The protection door 2 is made of aluminum alloy materials with smaller density, and the surface of the cover body 21 is sprayed with black paint with high absorptivity, so that stray light radiation can be reduced.

The light shield cylinder 3 comprises a cylinder body 33, a mounting base 34, supporting ear seats I31 and supporting ear seats II 32, wherein the number of the supporting ear seats I31 is two, the number of the supporting ear seats II 32 is two, and the mounting base 34, the supporting ear seats I31 and the supporting ear seats II 32 are fixedly connected with the cylinder body 33.

The invention has two working modes, namely the opening and closing of the normal condition of the device and the opening and closing of the fault condition of the device, and the two working modes are described below with reference to the specific embodiment:

example 1

As shown in fig. 9 to 10, in the case of normal operation of the device, the opening and closing process of the protection door mechanism is as follows:

one end of the spring 102 hooks the spring connecting seat 101, and the other end of the spring 102 hooks the spring connecting hole 105-2 of the sliding seat 105, and the spring 102 is in a stretching state and has a certain pretightening force. The second motor 112 is in a power-off state, the brake 117 is electrically locked to the axle 116, and the tightening rope 113 wound around the axle 116 is fixed on the rope hole 105-1 of the sliding seat 105 and exerts a certain tightening force on the sliding seat 105, and the tightening force and the pulling force of the spring 102 on the sliding seat 105 are balanced, so that the sliding seat 105 is kept in a static state relative to the guide rail 115.

Further, the motor one 103 is controlled to rotate forward, the electric cylinder rod 108 of the electric cylinder 106 is driven to retract, the connecting rod one 107 and the connecting rod two 111 are driven to rotate, the connecting rod two 111 drives the connecting lug seat II 23 hinged with the connecting lug seat I to rotate clockwise, meanwhile, the connecting lug seat I22 rotates relative to the supporting lug seat I31, and the protection door 2 is opened.

Further, when the protection door 2 is opened to a set angle, the connection lug I22 is limited by the limiting base 118 and cannot rotate continuously, and at this time, the protection door 2 is in a fully opened state. It should be noted that, the maximum opening angle of the protection door 2 may be adjusted according to the actual situation, so as to achieve the design requirement by adjusting the installation angle of the limit base 118 on the support ear seat I31.

Further, the motor one 103 is controlled to rotate reversely, the electric cylinder rod 108 of the electric cylinder 106 is driven to extend, the connecting rod one 107 and the connecting rod two 111 are driven to rotate, the connecting rod two 111 drives the connecting lug seat II 23 hinged with the connecting rod two to rotate anticlockwise, and the protection door 2 is closed.

Example two

As shown in fig. 11 to 12, when the electric cylinder 106 cannot normally operate due to the damage of the first motor 103 or other reasons, the opening and closing process of the protection door mechanism is as follows:

the brake 117 is powered off to release the wheel axle 116, at this time, the wheel axle 116 can rotate, the tightening rope 113 wound on the wheel axle 116 is released, the sliding seat 105 starts to move rightwards under the pretightening force of the spring 102, meanwhile, the motor first mounting seat 104 hinged on the sliding seat 105 drives the electric cylinder 106 to move, the connecting rod first 107 and the connecting rod second 111 are pulled to rotate, the connecting rod second 111 drives the connecting lug II 23 hinged with the connecting rod second to rotate clockwise, meanwhile, the connecting lug I22 rotates relative to the supporting lug I31, and the protection door 2 is opened. During this process, the tightening rope 113 wound around the wheel shaft 116 is gradually elongated, and the sliding seat 105 is gradually reduced in tension by the spring 102.

Further, when the length of the spring 102 is changed to the initial state, the connection lug I22 is limited by the limit base 118, and the protection door 2 is in the completely opened state, and the brake 117 is energized to lock the wheel shaft, so that the tension rope 113 cannot be further lengthened. The pre-tightening force applied to the spring 102 in advance can ensure that the protection door 2 is completely opened, and the tightening rope 113 is made of a material with high enough tensile strength, so that the protection door is not broken in the whole process.

Further, when the protection door 2 needs to be closed, the brake 117 is powered off to loosen the wheel shaft 116, the second motor 112 is powered on to drive the wheel shaft 116 which is coaxially connected to rotate, so that the tensioning rope 113 wound on the wheel shaft 116 is retracted, and since the extending end of the tensioning rope 113 is fixed on the rope threading hole 105-1 of the sliding seat 105, the sliding seat 105 moves leftwards under the pulling force of the tensioning rope 113, and further drives the opening and closing mechanism 3 to move, so that the protection door 2 is closed. During this process, the spring 102 connected to the slide base 105 is gradually stretched, and the pre-tightening force is gradually increased to a predetermined value.

The above process can be repeatedly performed, so that the repeated opening and closing of the protection door 2 can be effectively ensured, the recycling rate of the protection door mechanism is greatly improved, and the cost is effectively reduced.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and descriptions above are illustrative in nature and should not be construed as limiting the scope of the invention as claimed, any modifications or equivalent substitutions that fall within the scope of the invention are intended to be within the scope of the invention.

Claims

1. A protection door mechanism for space optical system, includes opening and shutting mechanism (1), protection door (2) and lens hood barrel (3), its characterized in that:

the opening and closing mechanism (1) comprises a spring connecting seat (101), a spring (102), a motor I (103), a motor I mounting seat (104), a sliding seat (105), an electric cylinder (106), a connecting rod I (107), an electric cylinder rod (108), a fork-shaped joint (109), a supporting shaft (110), a connecting rod II (111), a motor II (112), a tensioning rope (113), a sliding block (114), a guide rail (115), a wheel shaft (116), a brake (117), a limiting base (118) and a motor II mounting seat (119), the spring connecting seat (101) is fixedly connected with the mounting base (34), the spring (102) is a hook spring, one end of the spring (102) hooks the spring connecting seat (101), and the other end of the spring (102) hooks a spring connecting hole (105-2) of the sliding seat (105);

the motor I (103) is fixedly connected with the motor I mounting seat (104), the motor I mounting seat (104) is of a U-shaped structure, the motor I mounting seat (104) is hinged with the sliding seat (105), the sliding seat (105) is fixedly connected with the sliding blocks (114), the number of the guide rails (115) is two and symmetrically arranged on the mounting base (34), two sliding blocks (114) are arranged on each guide rail (115), the sliding blocks (114) and the guide rails (115) form a moving pair, and the guide rails (115) are fixedly connected with the mounting base (34);

the electric cylinder rod (108) is hinged to the supporting shaft (110) through a fork-shaped connector (109), the number of the first connecting rods (107) is two, one end of the first connecting rods (107) is hinged to the supporting lug seat II (32), the other end of the first connecting rods (107) is hinged to the supporting shaft (110), the number of the second connecting rods (111) is two, one end of the second connecting rods (111) is hinged to the connecting lug seat II (23), and the other end of the second connecting rods (111) is hinged to the supporting shaft (110);

the number of the limiting bases (118) is two, the number of the motor two (112) is two, each limiting base (118) is fixedly connected with the supporting ear seat I (31) through bolts, each motor two (112) is fixedly connected with the motor two mounting seats (119), the motor two mounting seats (119) are fixedly connected with the limiting bases (118), an output shaft of the motor two (112) is coaxially connected with the wheel shaft (116), the tensioning rope (113) is wound on the wheel shaft (116), the extending end of the tensioning rope (113) is fixed on a rope threading hole (105-1) of the sliding seat (105), the sliding seat (105) is tensioned through the tensioning rope (113), and the brake (117) is fixedly connected with the limiting bases (118).

2. A protection door mechanism for a space optical system according to claim 1, characterized in that the protection door (2) comprises: the novel connecting device comprises a cover body (21), connecting lug seats I (22) and connecting lug seats II (23), wherein the number of the connecting lug seats I (22) is two pairs, the number of the connecting lug seats II (23) is two, and the connecting lug seats I (22) and II (23) are fixedly connected with the cover body (21).

3. A protection door mechanism for a space optical system according to claim 1, wherein the light shield cylinder (3) comprises: the novel portable electronic device comprises a barrel body (33), a mounting base (34), supporting ear seats I (31) and supporting ear seats II (32), wherein the number of the supporting ear seats I (31) is two, the number of the supporting ear seats II (32) is two, and the mounting base (34), the supporting ear seats I (31) and the supporting ear seats II (32) are fixedly connected with the barrel body (33).

4. A protection door mechanism for a space optical system according to claim 1, characterized in that the sliding seat (105) is symmetrically arranged with two rope holes (105-1).

5. A protective door mechanism for a space optical system according to claim 2, wherein the protective door (2) is made of aluminum alloy material with smaller density, and the surface of the cover body (21) is sprayed with black paint with high absorptivity.