A friction limiting filter switching mechanism

Abstract

The application relates to the technical field of space laser communication, in particular to a friction-limiting filter switching mechanism, which comprises a rotary driving mechanism, a filter assembly and a limiting piece; further comprising a friction retaining mechanism, the overall position of the friction retaining mechanism is fixed relative to the overall position of the rotary driving mechanism, and one end of the friction retaining mechanism is in contact with the filter assembly, continuously and stably applying pressure to the filter assembly, so that a stable friction force exists between the friction retaining mechanism and the filter assembly. The friction force should be greater than the load torque generated by the satellite angular acceleration and less than the motor rotation torque, so as to avoid the filter assembly changing the position after switching when the satellite executes the angular acceleration. After the rotary driving mechanism drives the filter assembly to rotate at a low speed and collide with the limiting piece, due to the existence of the friction torque, the filter assembly will not bounce away to other magnetic pole pairs after colliding with the limiting piece, thereby reducing the risk of the filter assembly deviating from the expected position.

Description

Technical Field

[0001] This invention relates to the field of space laser communication technology, and specifically to a friction-limiting filter switching mechanism. Background Technology

[0002] In the field of space laser communication technology, incoherent optical communication systems generally use wavelength splitting to achieve beam splitting in the transmitting and receiving paths. Therefore, the same terminal can only transmit at one fixed wavelength and receive at another fixed wavelength. In coherent optical communication systems, the transmitting and receiving paths use polarization splitting. Therefore, by setting up a laser and using a switchable narrowband bandpass filter, the same terminal can switch between two wavelengths at the transmitting and receiving ends, increasing the flexibility of communication link construction.

[0003] In the past, switching mechanisms such as beam divergence angle and self-calibration only required short-term operation. However, the heat generated by keeping the motor powered on for a long time would affect the temperature distribution of the main frame, thereby damaging the positional relationship of components and affecting communication quality. Therefore, they usually use a structure with springs to keep the motor open most of the time.

[0004] Narrowband bandpass filter switching mechanisms need to maintain their current state long-term after switching to any band, making spring-based structures unsuitable. If the motor is powered down directly without design intervention, the motor's load inertial torque will exceed its holding torque during satellite maneuvers, altering the switched position and affecting its reliability. Furthermore, gravity during ground testing increases the difficulty of maintaining the position after power-down. Additionally, the miniaturization requirements of the terminal necessitate the use of stepper motors, but the stepper motor stator windings are not endless; after a collision with the limiting component, the load will be attracted by the nearby windings with a strong magnetic force, posing a risk of deviating from the expected position. Summary of the Invention

[0005] 1. The problem to be solved

[0006] To address the problem that existing narrowband bandpass filter switching mechanisms are difficult to maintain their position after power-off and pose a risk of deviating from the expected position during switching, this invention provides a friction-limiting filter switching mechanism that can stably maintain its working position after power-off and reduces the risk of deviating from the expected position during switching.

[0007] 2. Technical Solution

[0008] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0009] A friction-limiting filter switching mechanism includes a rotary drive mechanism, a filter assembly, and a limiting member. The rotary drive mechanism is used to drive the filter assembly to rotate and switch, and the limiting member is used to limit the rotation range of the filter assembly and determine its working position.

[0010] It also includes a friction holding mechanism, one end of which abuts against the filter assembly to generate frictional resistance that hinders the rotation of the filter assembly. This frictional resistance is used to prevent the filter assembly from rebounding away from the limiter after it collides with the limiter, and to keep the filter assembly stably in the working position after the rotary drive mechanism is powered off.

[0011] As a preferred embodiment of the present invention, the friction holding mechanism is disposed between the rotary drive mechanism and the filter assembly, with one end mounted on the rotary drive mechanism and the other end abutting against the filter assembly.

[0012] As a preferred embodiment of the present invention, the friction holding mechanism is configured as a spring plunger, and the ball end of the spring plunger abuts against the filter assembly.

[0013] As a preferred embodiment of the present invention, the filter assembly is provided with a wear-resistant slide, and one end of the friction holding mechanism abuts against the wear-resistant slide.

[0014] As a preferred embodiment of the present invention, the wear-resistant slide is configured as an arc-shaped wear-resistant slide, and the center of the arc-shaped wear-resistant slide is the rotation center of the filter assembly.

[0015] As a preferred embodiment of the present invention, two sets of friction retaining mechanisms and arc-shaped wear-resistant slides are provided, and they are centrally symmetrically distributed about the rotation center of the filter.

[0016] As a preferred embodiment of the present invention, the filter assembly is provided with a rotating mounting position, which is connected to the rotating output shaft of the rotating drive mechanism. The vertical distance between the center of gravity of the filter assembly and the axis of the rotating output shaft is less than 5mm, so as to reduce the difficulty of maintaining the position of the filter assembly.

[0017] As a preferred embodiment of the present invention, the filter assembly is located on the axis of the rotating output shaft.

[0018] As a preferred embodiment of the present invention, the limiting member is provided with limiting part one and limiting part two, and the filter assembly is provided with limiting part three and limiting part four; when limiting part one abuts against limiting part three, the filter assembly is in a first working position, and when limiting part two abuts against limiting part four, the filter assembly is in a second working position.

[0019] The limiting component is located between the limiting part three and the limiting part four, and the limiting part one and the limiting part two are respectively located on both sides of the limiting component.

[0020] As a preferred embodiment of the present invention, the filter assembly includes a lens mount;

[0021] Two filters are installed on the lens mount, both of which are filters corresponding to the receiving end; or, four filters are installed on the lens mount, two of which are filters corresponding to the receiving end and the remaining two are filters corresponding to the transmitting end, and the two filters corresponding to the receiving end are installed on the same side of the lens mount, and the two filters corresponding to the transmitting end are installed on the same side of the lens mount.

[0022] As a preferred embodiment of the present invention, the filter is installed in the mounting groove on the lens mount, and the side of the mounting groove is provided with an adhesive injection groove.

[0023] As a preferred embodiment of the present invention, the rotating mounting position is set as the shaft hole of the mirror base, and the rotating output shaft is provided with an axial threaded hole. The mirror base is pressed and fixed on the rotating output shaft by screws.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] (1) In this invention, the friction holding mechanism is fixed in position relative to the rotary drive mechanism, and one end of the friction holding mechanism abuts against the filter assembly, continuously and stably applying pressure to the filter assembly, so that a stable frictional force exists between the friction holding mechanism and the filter assembly. This frictional force should be greater than the load torque generated by the satellite's maneuvering angular acceleration and less than the motor's rotational torque, to prevent the filter assembly from changing its position after switching when the satellite performs maneuvering angular acceleration. When the rotary drive mechanism drives the filter assembly to rotate at low speed and collide with the limiting member, due to the existence of the frictional torque, the filter assembly will not bounce away to other magnetic pole pairs after hitting the limiting member, but will continuously and weakly hit the limiting block until the motion command ends and it stops at the limiting position, reducing the risk of the filter assembly deviating from the expected position.

[0027] (2) In this invention, the filter assembly is provided with a rotating mounting position, which is connected to the rotating output shaft of the rotating drive mechanism. The center of gravity of the filter assembly is located on the axis of the rotating output shaft. At this time, gravity will not cause torque on the filter assembly around the rotating output shaft. The filter assembly will not rotate due to its own gravity at any angle, thus basically eliminating the torque required to counteract the gravitational torque. This is beneficial to maintaining the static balance of the filter assembly and reducing the difficulty of maintaining the position of the filter assembly. When the center of gravity is on the axis of the rotating output shaft, the mass of the filter assembly is also closer to the axis, making the moment of inertia of the filter assembly smaller. This is beneficial to reducing the load torque generated by the satellite maneuvering angular acceleration and further reducing the difficulty of maintaining the position of the filter assembly. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the filter switching and holding device in this invention when two filters are provided;

[0029] Figure 2 This is a schematic diagram of the structure of the filter assembly in this invention when four filters are provided on it;

[0030] Figure 3 for Figure 2 Another structural diagram from a different perspective;

[0031] Figure 4 for Figure 1 Schematic diagram of the middle limiting component;

[0032] Figure 5 for Figure 1 A schematic diagram of the rotating drive mechanism.

[0033] Explanation of the labels in the diagram:

[0034] 100. Rotary drive mechanism; 110. Rotary output shaft; 120. Motor; 130. Motor mount; 140. Limiting interface;

[0035] 200, Filter assembly; 210, Rotating mounting position; 220, Limiting part three; 230, Limiting part four; 240, Lens mount; 250, Filter; 260, Mounting groove; 270, Adhesive injection groove; 280, Wear-resistant slide;

[0036] 300. Limiting component; 310. Limiting part one; 320. Limiting part two;

[0037] 400. Friction retention mechanism. Detailed Implementation

[0038] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0039] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0040] Example 1

[0041] This embodiment provides a friction-limiting filter switching mechanism, such as... Figures 1-5As shown, it includes a rotary drive mechanism 100, a filter assembly 200, a limiting member 300, and a friction holding mechanism 400.

[0042] The filter assembly 200 includes a rotatable mounting position 210, which is connected to the rotation output shaft 110 of the rotary drive mechanism 100. The rotary drive mechanism 100 can drive the filter assembly 200 to rotate and switch. When the filter assembly 200 rotates and switches, the limiting member 300 is used to limit the rotation range of the filter assembly 200 and determine its working position. When the filter assembly 200 rotates to the point of contact with the limiting member 300, it indicates that the filter assembly 200 has reached the working position, and at the same time, the limiting member 300 also prevents the filter assembly 200 from continuing to rotate.

[0043] The friction holding mechanism 400 is fixed in position relative to the rotary drive mechanism 100, and one end of the friction holding mechanism 400 abuts against the filter assembly 200, continuously and stably applying pressure to the filter assembly 200 to ensure a stable frictional force between the friction holding mechanism 400 and the filter assembly 200. This frictional force should be greater than the load torque generated by the satellite's maneuvering angular acceleration to prevent the filter assembly 200 from changing its switched position when the satellite performs maneuvering angular acceleration. That is, after the rotary drive mechanism 100 is powered off, the filter assembly 200 should be stably maintained in its working position. This frictional force should also be less than the torque of the motor 120 to ensure that the rotary drive mechanism 100 can normally drive the filter assembly 200 to rotate and switch positions. When the rotary drive mechanism 100 drives the filter assembly 200 to rotate at low speed and collide with the limiting member 300, due to the existence of frictional torque, the filter assembly 200 will not bounce away to other magnetic pole pairs after hitting the limiting member 300. Instead, it will continuously and weakly hit the limiting block until the motion command ends and stops at the limiting position. Therefore, even if the current position of the filter assembly 200 is unknown, the required position command of the filter 250 can still be executed, reducing the risk of the filter assembly 200 deviating from the expected position.

[0044] In this embodiment, the friction-limiting filter switching mechanism realizes the switching of the narrowband bandpass filter 250 and the power-off position retention function after switching. This reduces the unnecessary waste and pressure caused by the long-term power-on of the motor 120 to the system power consumption and heat dissipation. In turn, it realizes the switching function of two bands at the same terminal transmitter and receiver, and increases the flexibility of communication link construction.

[0045] Example 2

[0046] Based on the above embodiments, in this embodiment, the friction holding mechanism 400 is disposed between the rotary drive mechanism 100 and the filter assembly 200, such as... Figure 5As shown, one end of the filter assembly 400 is mounted on the rotary drive mechanism 100 but does not rotate with the rotary output shaft 110, while the other end abuts against the filter assembly 200. Specifically, the friction holding mechanism 400 is configured as a spring plunger, and the ball end of the spring plunger abuts against the filter assembly 200 under the action of the spring. Since the contact point is a rolling ball, rolling friction can be achieved, reducing wear during the friction process and controlling the friction force, so that the filter assembly 200 is subjected to pressure and static friction when stationary. The spring plunger itself is prior art and will not be described in detail here.

[0047] Furthermore, such as Figure 3 As shown, the filter assembly 200 is provided with a wear-resistant slide 280, and one end of the friction holding mechanism 400 abuts against the wear-resistant slide 280. Specifically, the wear-resistant slide 280 is a stainless steel sheet, embedded in the filter assembly 200, and remains in contact with the spring plunger as the filter assembly 200 moves, receiving pressure and friction from the spring plunger. Preferably, the wear-resistant slide 280 is an arc-shaped wear-resistant slide, with the center of the arc-shaped wear-resistant slide being the rotation center of the filter assembly 200. Two sets of friction holding mechanisms 400 and arc-shaped wear-resistant slides are provided, and they are centrally symmetrically distributed about the rotation center of the filter 250. This helps to reduce the variables in subsequently configuring the filter assembly 200 on the axis of the rotating output shaft 110, reducing the configuration difficulty.

[0048] Example 3

[0049] Based on the above embodiments, in this embodiment, the filter assembly 200 is provided with a rotating mounting position 210, which is connected to the rotating output shaft 110 of the rotating drive mechanism 100. The vertical distance between the center of gravity of the filter assembly 200 and the axis of the rotating output shaft 110 is less than 5mm, for example, it can be 4mm, 3mm, 0.5mm, 0.1mm, etc. Preferably, the center of gravity of the filter assembly 200 is located on the axis of the rotating output shaft 110. At this time, gravity will not cause the filter assembly 200 to generate torque around the rotating output shaft 110. The filter assembly 200 will not rotate due to its own gravity at any angle, thereby basically eliminating the torque required to counteract the gravitational torque, which is beneficial to maintaining the static balance of the filter assembly 200 and reducing the difficulty of maintaining the position of the filter assembly 200. When the center of gravity is on the axis of the rotating output shaft 110, the mass of the filter assembly 200 is also closer to the axis, making the moment of inertia of the filter assembly 200 smaller. This helps to reduce the load torque generated by the satellite maneuvering angular acceleration and further reduces the difficulty of maintaining the position of the filter assembly 200.

[0050] Example 4

[0051] Based on the above embodiments, such as Figure 2 and Figure 3As shown, in this embodiment, the filter assembly 200 includes a lens mount 240, which is used to fix multiple filters 250, each of which passes through a different wavelength band. Specifically, the lens mount 240 is provided with a mounting groove 260 for mounting the filters 250, and a glue injection groove 270 is provided on the side of the mounting groove 260. The glue injection groove 270 is connected to the mounting groove 260. After the filters 250 are placed into the mounting groove 260, glue is injected into the glue injection groove 270 to bond and fix the filters 250 in the mounting groove 260. The lens mount 240 and the multiple filters 250 are designed to be balanced, so that the overall center of gravity of the filter assembly 200 is positioned at the center of the rotating mounting position 210, that is, on the axis of the rotating output shaft 110.

[0052] The rotating mounting position 210 is configured as the shaft hole of the lens mount 240. The rotating output shaft 110 mates with the shaft hole to ensure a certain assembly accuracy, so that the center of gravity of the filter assembly 200 is more reliably placed on the axis of the rotating output shaft 110. The rotating output shaft 110 is provided with an axial threaded hole, and the lens mount 240 is pressed and fixed to the rotating output shaft 110 by screws. Since the pressure provided by the friction holding mechanism 400 increases the pressure on the threaded engagement surface, it is more conducive to the reliability of the connection. Therefore, the continuous pressure of the friction holding mechanism 400 on the filter assembly 200 in the direction of disengagement from the rotating output shaft 110 not only does not make the filter assembly 200 loose, but also makes the filter assembly more securely fixed, while reducing the possibility of screw loosening.

[0053] In practice, filter 250 can be configured as two or four. For example... Figure 1 As shown, when only two filters 250 are configured, both filters 250 are filters 250 corresponding to the receiving end. Preferably, the two filters 250 are located on the same side of the lens mount 240 and are closely adjacent to each other, reducing the difficulty of center of gravity balancing. Figure 2 and Figure 3 As shown, when four filters 250 are configured, two are filters 250 corresponding to the receiving end, and the remaining two are filters 250 corresponding to the transmitting end. Preferably, the two filters 250 corresponding to the receiving end are mounted on the same side of the lens mount 240, and the two filters 250 corresponding to the transmitting end are mounted on the same side of the lens mount 240, with the left and right filters 250 arranged approximately symmetrically. In use, the four filters 250 are arranged in two groups: the lower left filter 250 and the upper right filter 250 form one group, and the upper left filter 250 and the lower right filter 250 form another group. Figure 2In the middle, the filter 250 in the lower left and the filter 250 in the upper right are in the working position. By rotating and switching, the filter 250 in the upper left and the filter 250 in the lower right are switched to the working position, that is, the filter 250 in the upper left moves to the current position of the filter 250 in the lower left, and the filter 250 in the lower right moves to the current position of the filter 250 in the upper right.

[0054] Example 5

[0055] Based on the above embodiments, in this embodiment, the rotary drive mechanism 100 includes a motor 120, the rotation output shaft 110 of the rotary drive mechanism 100 is set as a motor shaft, the motor 120 is provided with a motor base 130 for fixing the motor 120, and the limiting member 300 is fixedly installed on the limiting interface 140 on the motor base 130 by screws.

[0056] The limiting member 300 is provided with a limiting part 310 and a limiting part 320. Preferably, the limiting part 310 and the limiting part 320 are two surfaces of the limiting member 300 itself. The filter assembly 200 is provided with a limiting part 220 and a limiting part 230. Preferably, the limiting part 220 and the limiting part 230 are disposed on the lens mount 240, and the limiting part 220 and the limiting part 230 are two surfaces of the lens mount 240 itself.

[0057] The limiting member 300 is disposed between the limiting part three 220 and the limiting part four 230. The limiting part one 310 and the limiting part two 320 are respectively disposed on both sides of the limiting member 300. All four limiting parts are located on the same rotation radius. When the limiting part one 310 abuts against the limiting part three 220, the filter assembly 200 is in the first working position. When the limiting part two 320 abuts against the limiting part four 230, the filter assembly 200 is in the second working position.

[0058] By placing the limiting member 300 between the limiting part 320 and the limiting part 4230, and placing the limiting part 1 310 and the limiting part 2 320 on both sides of the limiting member 300, the filter assembly 200 can be switched between two working positions by controlling the limiting part 320 and the limiting part 1 310 to collide or the limiting part 4 230 and the limiting part 2 320 to collide by rotating the filter assembly 200 forward and backward.

[0059] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A friction-limiting filter switching mechanism, comprising a rotary drive mechanism (100), a filter assembly (200), and a limiting member (300), wherein the rotary drive mechanism (100) is used to drive the filter assembly (200) to rotate and switch, and the limiting member (300) is used to limit the rotation range of the filter assembly (200) and determine its working position; Its features are: It also includes a friction holding mechanism (400), one end of which abuts against the filter assembly (200) to generate frictional resistance that hinders the rotation of the filter assembly (200). This frictional resistance is used to prevent the filter assembly (200) from rebounding away from the limit member (300) after the filter assembly (200) collides with the limit member (300), and to keep the filter assembly (200) stably in the working position after the rotary drive mechanism (100) is powered off. The friction holding mechanism (400) is disposed between the rotary drive mechanism (100) and the filter assembly (200), with one end mounted on the rotary drive mechanism (100) and the other end abutting against the filter assembly (200); The friction holding mechanism (400) is offset from the rotation axis of the rotary drive mechanism (100), and the friction between the friction holding mechanism (400) and the filter assembly (200) is greater than the load torque generated by the satellite maneuver angular acceleration and less than the motor 120 rpm torque; The filter assembly (200) is provided with a rotating mounting position (210), which is connected to the rotating output shaft (110) of the rotating drive mechanism (100). The center of gravity of the filter assembly (200) is located on the axis of the rotating output shaft (110) to reduce the difficulty of maintaining the position of the filter assembly (200).

2. The friction-limiting filter switching mechanism according to claim 1, characterized in that: The friction holding mechanism (400) is configured as a spring plunger, and the ball end of the spring plunger abuts against the filter assembly (200).

3. The friction-limiting filter switching mechanism according to claim 2, characterized in that: The filter assembly (200) is provided with a wear-resistant slide (280), and one end of the friction holding mechanism (400) abuts against the wear-resistant slide (280).

4. The friction-limiting filter switching mechanism according to claim 3, characterized in that: The wear-resistant slide (280) is set as an arc-shaped wear-resistant slide, and the center of the arc-shaped wear-resistant slide is the rotation center of the filter assembly (200).

5. The friction-limiting filter switching mechanism according to claim 1, characterized in that: The limiting member (300) is provided with a limiting part one (310) and a limiting part two (320), and the filter assembly (200) is provided with a limiting part three (220) and a limiting part four (230); when the limiting part one (310) abuts against the limiting part three (220), the filter assembly (200) is in a first working position, and when the limiting part two (320) abuts against the limiting part four (230), the filter assembly (200) is in a second working position; The limiting member (300) is disposed between the limiting part three (220) and the limiting part four (230), and the limiting part one (310) and the limiting part two (320) are respectively disposed on both sides of the limiting member (300).

6. The friction-limiting filter switching mechanism according to claim 1, characterized in that: The filter assembly (200) includes a lens mount (240); Two filters (250) are installed on the lens mount (240), both filters (250) are filters (250) corresponding to the receiving end; or, four filters (250) are installed on the lens mount (240), two of which are filters (250) corresponding to the receiving end, and the remaining two are filters (250) corresponding to the transmitting end, and the two filters (250) corresponding to the receiving end are installed on the same side of the lens mount (240), and the two filters (250) corresponding to the transmitting end are installed on the same side of the lens mount (240).

7. The friction-limiting filter switching mechanism according to claim 6, characterized in that: The filter (250) is installed in the mounting groove (260) on the lens mount (240), and the mounting groove (260) is provided with a glue injection groove (270) on the side. The rotating mounting position (210) is set as the shaft hole of the mirror base (240), and the rotating output shaft (110) is provided with an axial threaded hole. The mirror base (240) is pressed and fixed on the rotating output shaft (110) by screws.

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