Optical axis parallelism alignment device of laser communication system

Abstract

The invention discloses an optical axis parallelism alignment device for a laser communication system, and relates to the technical field of laser communication, the optical axis parallelism alignment device comprises a tripod and a mounting platform, a camera supporting shaft is fixedly mounted on the top surface of the tripod, and a first communication camera and a second communication camera are fixedly mounted on the two sides of the camera supporting shaft respectively; the rear end of the first communication camera is fixedly connected with a first image plane detector, the rear end of the second communication camera is fixedly connected with a second image plane detector, a moving plate is arranged on the top surface of the mounting platform, and a rotatable rotating disc is mounted on the top surface of the moving plate; according to the invention, only the photoelectric theodolite and the pentaprism are needed to complete twice optical axis reference transfer, the method is simple, the two optical axes can be rapidly adjusted to be parallel, a large-aperture collimator is not needed, outdoor alignment can be carried out, and the application scene is wide.

Description

Technical Field

[0001] The invention relates to the technical field of laser communication, and in particular to an optical axis parallelism alignment device for a laser communication system. Background Art

[0002] In the transceiver equipment in the field of laser communication or some dual-axis optoelectronic systems, since they are aimed at the same target system, in order to ensure that the signal can be received with maximum efficiency, the optical axes of the multi-axis system are required to be parallel to each other. Therefore, the optical axis parallelism detection and adjustment are carried out during the final installation and calibration of the system and the debugging of the whole system.

[0003] At present, the method of adjusting the parallelism of dual optical axes requires the construction of a complex optical path, and the detection accuracy is easily reduced after too many reference transmissions. Alternatively, the parallel light tube method is used to simultaneously inject two beams of light into the parallel light tube, and a detector is placed at the image plane of the parallel light tube to obtain the image points of the two beams of light. When the two image points are adjusted to coincide, it means that the two optical axes are parallel. However, when the paraxial distance is far from the main axis, or when the distance between the two systems is large, a large-diameter parallel light tube is required for detection. Large-diameter light tubes are expensive and may not be available at any time. In addition, for some tasks that require optical axis parallelism adjustment outdoors, the conditions for parallel light tubes are not available. Therefore, a more convenient method with a wider range of application scenarios that can also ensure detection accuracy is needed.

[0004] In view of this, a laser communication system optical axis parallelism alignment device is provided to overcome the above-mentioned defects. Summary of the invention

[0005] The purpose of the present invention is to provide a laser communication system optical axis parallelism alignment device to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides a laser communication system optical axis parallelism alignment device, including a tripod and a mounting platform, a camera support shaft is fixedly installed on the top surface of the tripod, a first communication camera and a second communication camera are fixedly installed on both sides of the camera support shaft, a first image plane detector is fixedly connected to the rear end of the first communication camera, and a second image plane detector is fixedly connected to the rear end of the second communication camera. A movable plate is arranged on the top surface of the mounting platform, a rotatable rotating disk is installed on the top surface of the movable plate, a photoelectric theodolite is fixedly installed on the top surface of the rotating disk, the specific number of the movable plates is two, and a pentaprism is fixedly installed on the top surface of the other movable plate.

[0007] Furthermore, a square groove is opened on the top surface of the mounting platform, a rotatable bidirectional screw is installed on the side wall of the square groove, two square first moving blocks are threadedly connected on the outer wall of the bidirectional screw, and the two moving plates are respectively fixedly installed on the top surfaces of the two first moving blocks.

[0008] Furthermore, a pointing block is integrally formed at the edge of the rotating disk, and two limit blocks adapted to the pointing block are fixedly installed on the top surface of the movable plate. The specific shape of the two limit blocks is an inverted "L" shape, and the angle between the two limit blocks is ninety degrees.

[0009] Furthermore, a torsion plate is provided at the edge of the mounting platform, and the torsion plate is fixedly connected to the bidirectional lead screw.

[0010] Furthermore, a first square rod is fixedly installed at the edge of the mounting platform, a rectangular slot is opened inside the first square rod, a rotatable threaded rod is installed inside the slot, a rectangular second movable block is threadedly connected to the outer wall of the threaded rod, and a sunshade is hinged at the edge of the second movable block.

[0011] Furthermore, the shading plate is composed of a plurality of rectangular plates, and the plurality of rectangular plates are hinged to each other.

[0012] Furthermore, the specific number of the first square rods is two, the two first square rods are symmetrically arranged, a motor is fixedly mounted on the top surface of the first square rod on one side, and the bottom of the motor is transmission-connected to a threaded rod.

[0013] Furthermore, a first bevel gear is fixedly connected to the bottom of the threaded rod, a mounting block is fixedly installed at the bottom of the mounting platform, a rotatable round rod is installed inside the mounting block, and second bevel gears are fixedly connected to both sides of the round rod, and the second bevel gear is meshed with the first bevel gear.

[0014] Furthermore, a second square rod is fixedly installed at the edge of the mounting platform, a guide rod is fixedly installed inside the second square rod, a slidable square block is sleeved on the outer wall of the guide rod, and one end of the shading plate away from the first square rod is hinged on the side wall of the square block.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention only requires a photoelectric theodolite and a pentaprism to complete two optical axis reference transfers. The method is simple and can be quickly adjusted to achieve parallelism of the two optical axes. At the same time, a large-aperture parallel light tube is not required, and alignment can be performed outdoors, which has a wide range of application scenarios.

[0017] By providing a shading plate and coordinating related lifting components, the influence of external light sources on the device can be reduced when the device is used in a strong light environment, thereby making the use of the device easier.

[0018] A square groove is provided, and a bidirectional screw rod is provided in the square groove. Finally, two square first moving blocks are threadedly connected on the outer wall of the limit block, and the two moving plates are respectively installed on the top surfaces of the two first moving blocks, so that the user can drive the bidirectional screw rod to rotate by rotating the torsion disk, so that the photoelectric theodolite and the pentaprism installed above the two first moving blocks can be moved closer to or farther away from each other under the thrust of the thread of the bidirectional screw rod, thereby realizing the adjustment of the distance between the photoelectric theodolite and the pentaprism. This adjustable distance makes the device suitable for different laser communication systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the overall view of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the front side of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the rear side of the present invention;

[0022] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 5 It is a first working principle diagram of the present invention;

[0024] Figure 6 This is a second working principle diagram of the present invention.

[0025] In the figure: 1, first communication camera; 2, first image plane detector; 3, second communication camera; 4, second image plane detector; 5, camera support shaft; 6, photoelectric theodolite;

[0026] 7. pentaprism; 71. first refractive surface; 72. second refractive surface;

[0027] 8. Laser; 9. Tripod; 10. Mounting platform; 11. First square rod; 12. Second square rod; 13. Threaded rod; 14. Motor; 15. Guide rod; 16. Mounting block; 17. First bevel gear; 18. Second bevel gear; 19. Sunshade; 20. Bidirectional lead screw; 21. Torsion plate; 22. Moving plate; 23. Rotating plate; 24. Pointing block; 25. Limit block; 26. First moving block; 27. Second moving block. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1

[0030] See also Figure 1-5 A laser communication system optical axis parallelism alignment device includes a tripod 9 and a mounting platform 10. A camera support shaft 5 is fixedly installed on the top surface of the tripod 9. A first communication camera 1 and a second communication camera 3 are fixedly installed on both sides of the camera support shaft 5. A first image plane detector 2 is fixedly connected to the rear end of the first communication camera 1, and a second image plane detector 4 is fixedly connected to the rear end of the second communication camera 3. A moving plate 22 is arranged on the top surface of the mounting platform 10. A rotatable rotating disk 23 is installed on the top surface of the moving plate 22. A photoelectric theodolite 6 is fixedly installed on the top surface of the rotating disk 23. The specific number of the moving plates 22 is two, and a pentaprism 7 is fixedly installed on the top surface of another moving plate 22.

[0031] Furthermore, a square groove is opened on the top surface of the mounting platform 10, and a rotatable bidirectional screw 20 is installed on the side wall of the square groove. Two square first moving blocks 26 are threadedly connected on the outer wall of the bidirectional screw 20, and two moving plates 22 are fixedly installed on the top surfaces of the two first moving blocks 26 respectively. A torsion disk 21 is arranged at the edge position of the mounting platform 10, and the torsion disk 21 is fixedly connected to the bidirectional screw 20.

[0032] By setting a square groove, and setting a bidirectional screw rod 20 in the square groove, and finally setting two square first moving blocks 26 threadedly connected on the outer wall of the bidirectional screw rod 20, and its two moving plates 22 are respectively installed on the top surfaces of the two first moving blocks 26, the user can drive the bidirectional screw rod 20 to rotate by rotating the torsion plate 21, so that the photoelectric theodolite 6 and the pentaprism 7 installed above the two first moving blocks 26 can be moved closer to or away from each other under the thrust of the thread of the bidirectional screw rod 20, thereby realizing the adjustment of the distance between the photoelectric theodolite 6 and the pentaprism 7. This adjustable distance makes the device suitable for different laser communication systems.

[0033] Furthermore, a pointing block 24 is integrally formed at the edge of the rotating disk 23, and two limit blocks 25 adapted to the pointing block 24 are fixedly installed on the top surface of the movable plate 22. The specific shape of the two limit blocks 25 is an inverted "L" shape, and the angle between the two limit blocks 25 is ninety degrees.

[0034] The horizontal direction of the photoelectric theodolite 6 is set to zero in advance to keep the photoelectric theodolite 6 in a horizontal and stable state. Then, a pointing block 24 is set, and two limit blocks 25 adapted to the pointing block 24 are installed on the top surface of the movable plate 22. Finally, the angle between the two pointing blocks 24 is set to ninety degrees, so that the photoelectric theodolite 6 can rotate ninety degrees under the rotation angle limit of the rotating disk, thereby reducing the difficulty of adjusting the angle of the photoelectric theodolite 6 and making it easier to rotate the photoelectric theodolite 6.

[0035] In addition, a first square rod 11 is fixedly installed at the edge of the mounting platform 10, a rectangular slot is opened inside the first square rod 11, a rotatable threaded rod 13 is installed inside the slot, a rectangular second movable block 27 is threadedly connected to the outer wall of the threaded rod 13, and a shading plate 19 is hinged at the edge of the second movable block 27. The shading plate 19 is composed of a plurality of rectangular plates, and the plurality of rectangular plates are hinged to each other.

[0036] By setting a threaded rod 13, and setting a rectangular second moving block 27 threadedly connected to the outer wall of the threaded rod 13, and hingedly connected to the edge of the second moving block 27 with a shading plate 19, the threaded rod 13 can drive the second moving block 27 to rise or fall after rotation, and can drive the shading plate 19 to move upward during the rising process of the second moving block 27. The combination of multiple shading plates 19 can cover the side of the entire device. This arrangement can reduce the impact of external light sources on the device when the device is used in a strong light environment, thereby making the device easier to use.

[0037] It should be noted that the specific number of the first square rods 11 is two, and the two first square rods 11 are symmetrically arranged. A motor 14 is fixedly installed on the top surface of the first square rod 11 on one side, and the bottom of the motor 14 is transmission-connected to the threaded rod 13, and the bottom of the threaded rod 13 is fixedly connected to the first bevel gear 17, and a mounting block 16 is fixedly installed on the bottom of the mounting platform 10, and a rotatable round rod is installed inside the mounting block 16, and second bevel gears 18 are fixedly connected on both sides of the round rod, and the second bevel gear 18 is meshed with the first bevel gear 17.

[0038] By setting a round rod, and fixing the second bevel gear 18 on both sides of the round rod, and finally setting the second bevel gear 18 to mesh with the first bevel gear 17 fixedly connected to the bottom of the threaded rod 13, when one threaded rod 13 in the device rotates, the threaded rod 13 on the other side will rotate synchronously. This arrangement allows the user to drive one threaded rod 13 to rotate and simultaneously drive the two second moving blocks 27 to rise.

[0039] In addition, a second square rod 12 is fixedly installed at the edge of the mounting platform 10, a guide rod 15 is fixedly installed inside the second square rod 12, a slidable square block is sleeved on the outer wall of the guide rod 15, and the end of the shading plate 19 away from the first square rod 11 is hinged on the side wall of the square block.

[0040] By setting a guide rod 15, and setting a slidable square block on the outer wall of the guide rod 15, and the end of the shading plate 19 away from the first square rod 11 is hinged on the side wall of the square block, the rising process of the shading plate 19 is guided by the square block, and it will not easily deflect, while increasing the service life of the device.

[0041] In specific implementation, the first communication camera 1 and the first image plane detector 2 are connected to both ends of the camera support shaft 5 to form a system. The optical axes of the two cameras need to be adjusted to a parallel state. The adjustment method is as follows:

[0042] (1) First, place the photoelectric theodolite 6 to be used at the front end of the first communication camera 1, and level it according to the built-in level gauge of the photoelectric theodolite 6, and adjust the photoelectric theodolite 6 to be consistent with the horizontal reference of the earth. After the horizontal reference is adjusted, the photoelectric theodolite 6 is no longer lifted or pushed;

[0043] (2) Aim the light outlet of the photoelectric theodolite 6 toward the inside of the first communication camera 1, adjust the horizontal angle and the pitch angle of the photoelectric theodolite 6 until a cross image emitted by the photoelectric theodolite 6 is observed on the first image plane detector 2 of the first communication camera 1, then fine-tune the horizontal adjustment knob and the pitch adjustment knob of the photoelectric theodolite 6 to adjust the image formed on the first image plane detector 2 to the middle of the detector, and record the vertical angle θy of the photoelectric theodolite 6 at this time. At this time, the optical axis of the first communication camera 1 is consistent with the optical axis of the photoelectric theodolite 6, and the optical axis reference of the first communication camera 1 is transferred to the optical axis of the photoelectric theodolite 6;

[0044] (3) The photoelectric theodolite 6 is rotated horizontally by 90 degrees, and a pentaprism 7 is placed in front of the light outlet of the photoelectric theodolite 6 and in front of the first image plane detector 2. The pentaprism 7 is placed on an adjustment table, which can be adjusted in the horizontal direction and the pitch direction. The horizontal and pitch directions of the pentaprism 7 are adjusted until a cross image reflected by the first refractive surface 71 can be seen in the photoelectric theodolite 6, and then the pitch of the pentaprism 7 is adjusted to adjust the vertical angle in the photoelectric theodolite 6 to θy, and the pentaprism 7 is kept from moving;

[0045] According to the optical characteristics of the pentaprism 7, the light incident from the first refractive surface 71 will be emitted from the second refractive surface 72. No matter what the incident angle is, the emitted light will be deflected by ninety degrees. At this time, the light emitted from the photoelectric theodolite 6 is deflected by ninety degrees and incident on the second communication camera 3. The overall horizontal angle and pitch angle of the second communication camera 3 are adjusted until a cross image emitted by the photoelectric theodolite 6 appears in the second image plane detector 4. Then, fine-tuning is performed to adjust the cross image to the middle of the second image plane detector 4. At this time, the optical axis of the second communication camera 3 is consistent with the optical axis of the photoelectric theodolite 6 after ninety degrees of horizontal rotation at the current azimuth, and the optical axis of the second communication camera 3 is parallel to the optical axis of the first communication camera 1.

[0046] The present invention only requires a photoelectric theodolite 6 and a pentaprism 7 to complete two optical axis reference transfers. The method is simple and can be quickly adjusted to achieve parallelism of the two optical axes. It does not require a large-aperture collimator and can be aligned outdoors, and has a wide range of application scenarios.

[0047] By providing the shading plate 19 and cooperating with related lifting components, the influence of external light sources on the device can be reduced when the device is used in a strong light environment, thereby making the use of the device easier.

[0048] By setting a square groove, and setting a bidirectional screw rod 20 in the square groove, and finally setting a limit block 25 on the outer wall of which two square first moving blocks 26 are threadedly connected, and its two moving plates 22 are respectively installed on the top surfaces of the two first moving blocks 26, the user can drive the bidirectional screw rod 20 to rotate by rotating the torsion plate 21, so that the photoelectric theodolite 6 and the pentaprism 7 installed above the two first moving blocks 26 can be moved closer to or away from each other under the thrust of the thread of the bidirectional screw rod 20, thereby realizing the adjustment of the distance between the photoelectric theodolite 6 and the pentaprism 7. This adjustable distance makes the device suitable for different laser communication systems.

[0049] Embodiment 2

[0050] Based on Example 1, please refer to Figure 6 , a laser communication system optical axis parallelism alignment device is different from the first embodiment in that this embodiment has only one device for tracking communication cameras, the device has a first communication camera 1, a laser 8 is installed next to the first communication camera 1 to transmit a handshake signal, and the optical axis of the laser 8 needs to be adjusted to be consistent with the first communication camera 1. The specific usage is as follows:

[0051] Wherein, steps (1) to (3) are consistent with those in Example 1;

[0052] When the laser 8 emits laser light to the second refractive surface 72 and then emits it through the first refractive surface 71, the laser 8 is adjusted so that the laser light emitted from the first refractive surface 71 can be incident on the photoelectric theodolite 6. When the laser light emitted by the laser 8 can be seen in the photoelectric theodolite 6, the horizontal angle and the pitch angle of the laser 8 are adjusted so that the laser light spot in the photoelectric theodolite 6 coincides with the center of the cross image reflected back by the first refractive surface 71. At this time, the optical axis of the laser 8 is consistent with the optical axis of the photoelectric theodolite 6 after the current azimuth horizontal rotation position is ninety degrees, that is, the optical axis of the laser 8 is parallel to the optical axis of the photoelectric theodolite 6 after step (2) is completed, and the optical axis of the laser 8 is parallel to the optical axis of the first communication camera 1.

[0053] Working principle: The first communication camera 1 and the second communication camera 3 are connected at both ends of the camera support shaft 5 to form a system. The optical axes of the two cameras need to be adjusted to a parallel state. The adjustment method is as follows:

[0054] (1) First, place the photoelectric theodolite 6 to be used at the front end of the first communication camera 1, and level it according to the built-in level gauge of the photoelectric theodolite 6, and adjust the photoelectric theodolite 6 to be consistent with the horizontal reference of the earth. After the horizontal reference is adjusted, the photoelectric theodolite 6 is no longer lifted or pushed;

[0055] (2) Aim the light outlet of the photoelectric theodolite 6 toward the inside of the first communication camera 1, adjust the horizontal angle and the pitch angle of the photoelectric theodolite 6 until a cross image emitted by the photoelectric theodolite 6 is observed on the first image plane detector 2 of the first communication camera 1, then fine-tune the horizontal adjustment knob and the pitch adjustment knob of the photoelectric theodolite 6 to adjust the image formed on the first image plane detector 2 to the middle of the detector, and record the vertical angle θy of the photoelectric theodolite 6 at this time. At this time, the optical axis of the first communication camera 1 is consistent with the optical axis of the photoelectric theodolite 6, and the optical axis reference of the first communication camera 1 is transferred to the optical axis of the photoelectric theodolite 6;

[0056] (3) The photoelectric theodolite 6 is rotated horizontally by 90 degrees, and a pentaprism 7 is placed in front of the light outlet of the photoelectric theodolite 6 and in front of the first image plane detector 2. The pentaprism 7 is placed on an adjustment table, which can be adjusted in the horizontal and elevation directions. The horizontal and elevation positions of the pentaprism 7 are adjusted until a cross image reflected by the first refractive surface 71 can be seen in the photoelectric theodolite 6. Then, the elevation of the pentaprism 7 is adjusted to make the elevation angle of the pentaprism 7 consistent with the vertical angle θy of the theodolite, and the pentaprism 7 is kept from moving.

[0057] According to the optical characteristics of the pentaprism 7, the light incident from the first refractive surface 71 will be emitted from the second refractive surface 72. No matter what the incident angle is, the emitted light will be deflected by ninety degrees. At this time, the light emitted from the photoelectric theodolite 6 is deflected by ninety degrees and incident on the second communication camera 3. The horizontal angle and the pitch angle of the second communication camera 3 are adjusted until a cross image emitted by the photoelectric theodolite 6 appears in the second image plane detector 4. Then, fine-tuning is performed to adjust the cross image to the middle of the second image plane detector 4. At this time, the optical axis of the second communication camera 3 is consistent with the optical axis of the photoelectric theodolite 6 after ninety degrees of horizontal rotation at the current azimuth, and the optical axis of the second communication camera 3 is parallel to the optical axis of the first communication camera 1.

[0058] The present invention only requires a photoelectric theodolite 6 and a pentaprism 7 to complete two optical axis reference transfers. The method is simple and can be quickly adjusted to achieve parallelism of the two optical axes. It does not require a large-aperture collimator and can be aligned outdoors, and has a wide range of application scenarios.

[0059] By providing the shading plate 19 and cooperating with related lifting components, the influence of external light sources on the device can be reduced when the device is used in a strong light environment, thereby making the use of the device easier.

[0060] By setting a square groove, and setting a bidirectional screw rod 20 in the square groove, and finally setting a limit block 25 on the outer wall of which two square first moving blocks 26 are threadedly connected, and its two moving plates 22 are respectively installed on the top surfaces of the two first moving blocks 26, the user can drive the bidirectional screw rod 20 to rotate by rotating the torsion plate 21, so that the photoelectric theodolite 6 and the pentaprism 7 installed above the two first moving blocks 26 can be moved closer to or away from each other under the thrust of the thread of the bidirectional screw rod 20, thereby realizing the adjustment of the distance between the photoelectric theodolite 6 and the pentaprism 7. This adjustable distance makes the device suitable for different laser communication systems.

[0061] When the laser 8 emits laser light to the second refractive surface 72 and then emits it through the first refractive surface 71, the laser 8 is adjusted so that the laser light emitted from the first refractive surface 71 can be incident on the photoelectric theodolite 6. When the laser light emitted by the laser 8 can be seen in the photoelectric theodolite 6, the horizontal angle and the pitch angle of the laser 8 are adjusted so that the laser light spot in the photoelectric theodolite 6 coincides with the center of the cross image reflected back by the first refractive surface 71. At this time, the optical axis of the laser 8 is consistent with the optical axis of the photoelectric theodolite 6 after the current azimuth horizontal rotation position is ninety degrees, that is, the optical axis of the laser 8 is parallel to the optical axis of the photoelectric theodolite 6 after step (2) is completed, and the optical axis of the laser 8 is parallel to the optical axis of the first communication camera 1.

Claims

1. A laser communication system optical axis parallelism alignment device, comprising a tripod (9) and a mounting platform (10), wherein a camera support shaft (5) is fixedly mounted on the top surface of the tripod (9), a first communication camera (1) and a second communication camera (3) are fixedly mounted on both sides of the camera support shaft (5), a first image plane detector (2) is fixedly connected to the rear end of the first communication camera (1), and a second image plane detector (4) is fixedly connected to the rear end of the second communication camera (3), wherein: A movable plate (22) is arranged on the top surface of the installation platform (10), a rotatable rotating disk (23) is mounted on the top surface of the movable plate (22), a photoelectric theodolite (6) is fixedly mounted on the top surface of the rotating disk (23), the specific number of the movable plates (22) is two, and a pentaprism (7) is fixedly mounted on the top surface of another movable plate (22).

2. The optical axis parallelism alignment device for a laser communication system according to claim 1, characterized in that: A square groove is provided on the top surface of the installation platform (10), a rotatable bidirectional screw rod (20) is installed on the side wall of the square groove, two square first moving blocks (26) are threadedly connected on the outer wall of the bidirectional screw rod (20), and the two moving plates (22) are respectively fixedly installed on the top surfaces of the two first moving blocks (26).

3. The optical axis parallelism alignment device for a laser communication system according to claim 2, characterized in that: A pointing block (24) is integrally formed at the edge of the rotating disk (23), and two limit blocks (25) adapted to the pointing block (24) are fixedly mounted on the top surface of the movable plate (22), wherein the specific shape of the two limit blocks (25) is an inverted "L" shape, and the angle between the two limit blocks (25) is ninety degrees.

4. The optical axis parallelism alignment device for a laser communication system according to claim 3, characterized in that: A torsion plate (21) is provided at the edge of the installation platform (10), and the torsion plate (21) is fixedly connected to the bidirectional screw rod (20).

5. The optical axis parallelism alignment device for a laser communication system according to claim 1, characterized in that: A first square rod (11) is fixedly mounted at the edge of the mounting platform (10); a rectangular notch is provided inside the first square rod (11); a rotatable threaded rod (13) is mounted inside the notch; a rectangular second moving block (27) is threadedly connected to the outer wall of the threaded rod (13); and a shading plate (19) is hingedly mounted at the edge of the second moving block (27).

6. The optical axis parallelism alignment device for a laser communication system according to claim 5, characterized in that: The shading plate (19) is composed of a plurality of rectangular plates, and the plurality of rectangular plates are hinged to each other.

7. The optical axis parallelism alignment device for a laser communication system according to claim 5, characterized in that: The specific number of the first square rods (11) is two, and the two first square rods (11) are symmetrically arranged. A motor (14) is fixedly mounted on the top surface of one side of the first square rod (11), and the bottom of the motor (14) is transmission-connected to the threaded rod (13).

8. The optical axis parallelism alignment device for a laser communication system according to claim 7, characterized in that: A first bevel gear (17) is fixedly connected to the bottom of the threaded rod (13), a mounting block (16) is fixedly installed to the bottom of the mounting platform (10), a rotatable round rod is installed inside the mounting block (16), and second bevel gears (18) are fixedly connected to both sides of the round rod, and the second bevel gear (18) is meshed with the first bevel gear (17).

9. The optical axis parallelism alignment device for a laser communication system according to claim 8, characterized in that: A second square rod (12) is fixedly mounted on the edge of the mounting platform (10), a guide rod (15) is fixedly mounted inside the second square rod (12), a slidable square block is sleeved on the outer wall of the guide rod (15), and one end of the shading plate (19) away from the first square rod (11) is hinged on the side wall of the square block.

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