Laser communication terminal vacuum test system and test method thereof

Abstract

The application discloses a kind of laser communication terminal vacuum test system and its testing method, it is related to optical detection technical field, including support mechanism, the support mechanism top center is provided with blocking mechanism, the support mechanism top rear end is provided with lifting mechanism, the lifting mechanism front top is provided with vacuum forming mechanism, the support mechanism inside front end is provided with the terminal bearing mechanism of being measured, the terminal bearing mechanism rear side of being measured is connected with the push-pull mechanism of transmission connection with support mechanism.The application does not exist in the dismounting process of terminal being measured Block, therefore, dismounting difficulty is lower, time consumption is shorter, in addition, because the space required for operation is not needed in the sealing cover inside vacuum forming mechanism when dismounting, only need to reserve the space for terminal being measured to adjust laser emission direction, therefore, internal space is relatively less, the time required for vacuumizing is shorter, for test efficiency has obviously improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical detection, in particular to a laser communication terminal vacuum test system and a test method thereof. BACKGROUND

[0002] With the development of space remote sensing technology, various types of payloads such as satellites will obtain a large amount of space exploration data, which needs to be transmitted to the ground in real time for analysis by relevant technical personnel. At present, the commonly used microwave bandwidth on the satellite is about 100 megabytes and has reached a bottleneck, and the data transmission speed is relatively slow. The optical fiber laser communication transmission rate is as high as 40G / s, so using laser as the medium for communication can well solve the communication bandwidth bottleneck problem. As an effective payload, the space laser communication system needs to be strictly tested for its main technical indicators before it is developed and launched.

[0003] In the prior art, when a laser communication terminal is tested in a vacuum, the measured terminal needs to be installed in a vacuum tank first, and then the vacuum tank and the parallel light pipe connected to the vacuum tank are subjected to vacuumizing treatment to simulate the actual application environment, such as the scheme disclosed in the authorized patent CN107655659B.

[0004] However, in order to facilitate the installation and fixation of the measured terminal, the vacuum tank needs to have a relatively large operating space inside to avoid being blocked by the inner wall of the vacuum tank during the installation and fixation of the measured terminal. This results in a long time-consuming vacuumizing operation after the installation of the measured terminal, and the pre-step is time-consuming, which greatly affects the test efficiency.

[0005] Therefore, it is necessary to invent a laser communication terminal vacuum test system and a test method thereof to solve the above problems. SUMMARY

[0006] The present application aims to provide a laser communication terminal vacuum test system and a test method thereof, which can install and fix the measured terminal by using a measured terminal bearing mechanism. Since there is no obstruction during disassembly and assembly, the disassembly and assembly difficulty is low and the time-consuming is short. In addition, since the inner space of the sealing cover in the vacuum forming mechanism does not need to reserve the operating space required during disassembly and assembly, only the space for adjusting the laser emission direction of the measured terminal needs to be reserved, the inner space is relatively small, the required vacuumizing time is shorter, and the test efficiency is obviously improved. The present application solves the problem that the prior art needs to have a relatively large space inside the vacuum tank to facilitate the installation of the measured terminal in the vacuum tank, which results in a long time-consuming vacuumizing operation after the installation of the measured terminal, and the pre-step is time-consuming, which greatly affects the test efficiency.

[0007] In order to achieve the above object, the present application provides the following technical scheme: a laser communication terminal vacuum test system, comprising a support mechanism, a blocking mechanism is arranged at the top center of the support mechanism, a lifting mechanism is arranged at the top rear end of the support mechanism, a vacuum forming mechanism is arranged at the front top of the lifting mechanism, a measured terminal bearing mechanism is arranged at the front end of the inner side of the support mechanism, and a push-pull mechanism is connected with the support mechanism and is in transmission connection.

[0008] The vacuum forming mechanism comprises a sealing cover fixedly connected to the front end of the lifting frame, the sealing cover is matched with the measured terminal, parallel light pipes are fixedly nested on the left side of the sealing cover, sealing optical windows are fixedly nested on the sealing cover and the parallel light pipes, and a sealing ring is bonded to the bottom of the sealing cover.

[0009] The measured terminal bearing mechanism comprises a moving seat A which is slidably sleeved on the outer sides of two guide rods A through linear bearings, an avoiding channel for avoiding the lead screw A is formed in the front middle part of the moving seat A, a bearing plate is fixedly arranged at the top of the moving seat A, and mounting screw holes are formed in the top corners of the bearing plate.

[0010] Preferably, the support mechanism comprises a support base, a lead screw A is rotatably nested in the middle of the inner side of the support base through a bearing, and a servo motor in transmission connection with the lead screw A is fixedly arranged at the front end of the support base.

[0011] Preferably, guide rods A which are parallel to each other and the lead screw A are fixedly arranged on both sides of the inner side of the support base, and fixed plates are fixedly arranged at both ends of the two sides of the support base.

[0012] Preferably, the blocking mechanism comprises a blocking cross beam fixedly arranged at the top center of the support base, a plurality of guide blocks are fixedly arranged on the front of the blocking cross beam, and lifting inclined surfaces are formed in the top of any one of the guide blocks.

[0013] Preferably, the lifting mechanism comprises a fixed frame fixedly arranged at the top rear end of the support base, a guide rod B is fixedly nested on the left side of the bottom of the fixed frame, a lead screw B which is parallel to the guide rod B is rotatably nested on the right side of the bottom of the fixed frame through a bearing, a gear is fixedly sleeved on the outer bottom end of the lead screw B, a lifting frame is jointly sleeved on the outer sides of the guide rod B and the lead screw B, the lifting frame is slidably connected with the guide rod B in the vertical direction through a linear bearing, and the lifting frame is in transmission connection with the lead screw B.

[0014] Preferably, the vacuum forming mechanism further comprises an evacuation pipe fixedly penetrating the right side bottom of the sealing cover, a one-way valve is arranged on the evacuation pipe, a negative pressure device is connected to the output end of the evacuation pipe, a pressure relief pipe is fixedly penetrated on the right side top of the sealing cover, and a stop valve is arranged on the pressure relief pipe.

[0015] Preferably, the measured terminal bearing mechanism further comprises two lower sleeves fixedly arranged on the back of the moving seat A, a locking pin is slidably arranged in the inner side of the lower sleeve in the vertical direction, the top end of the locking pin is fixedly connected with an end plate, an upper sleeve and a return spring are sequentially and sleevedly arranged on the outer side of the end plate from top to bottom, the upper sleeve is fixedly connected with the locking pin, and the return spring is fixedly connected between the lower sleeve and the upper sleeve.

[0016] Preferably, the push-pull mechanism comprises a moving seat B which is slidably and sleevedly arranged on the outer side of the two guide rods A and is drivingly and sleevedly arranged on the outer side of the lead screw A, the top of the moving seat B is provided with an avoiding groove on both sides, the front of the moving seat B is fixedly provided with a push-pull plate which is attached to the back of the moving seat A, the top of any one of the push-pull plates is provided with a locking groove in which the end part of the adjacent locking pin is inserted, the rear middle part of the moving seat B is fixedly provided with an extension rod, and the right side of the extension rod is fixedly provided with a rack.

[0017] Preferably, the laser communication terminal vacuum test system further comprises a divergence angle test module in which the laser input end is collinear with the front sealing optical window of the collimator and an output power and wave phase difference test module in which the laser input end is collinear with the front sealing optical window of the sealing cover.

[0018] The application further discloses a laser communication terminal vacuum test method, which is realized by using the laser communication terminal vacuum test system.

[0019] S1, the measured terminal is installed at the top center position of the bearing plate through the four mounting screw holes, the servo motor drives the lead screw A to rotate, the lead screw A drives the moving seat B guided by the guide rod A to continuously move backward, the moving seat B moves backward to drive the locking pin to move backward through the push-pull plate and the locking groove, the locking pin drives the moving seat A to move backward through the lower sleeve, and the moving seat A drives the measured terminal to continuously move backward through the bearing plate;

[0020] S2, as the moving seat A continuously moves backward, the lifting slope at the top of the guide block is in contact with the end plate, as the moving seat A continuously moves backward, the end plate is guided to rise by the lifting slope, the end plate drives the locking pin to rise in the process of rising, and then the bottom end of the locking pin moves upward in the inner side of the adjacent locking groove;

[0021] S3, when the back of the moving seat A is in contact with the front end of the guide block, the bottom end of the locking pin is extracted from the inner side of the locking groove, and at this time, the measured terminal is located at the test station directly below the sealing cover.

[0022] S4. As the moving base B continues to move backward, the moving base B drives the rack and gear to mesh through the extension rod. Then the rack drives the lead screw B to rotate through the gear, which in turn drives the lifting frame guided by the guide rod B to move downward continuously. When the lifting frame moves downward, it drives the sealing cover to move downward synchronously until the sealing cover is pressed against the top of the bearing plate by the sealing ring. At this time, the terminal under test is located inside the sealing cover, and there is only space between the inner wall of the sealing cover and the terminal under test for the terminal under test to adjust the laser emission direction. At the same time, the current direction of the terminal under test is aligned with the collimator.

[0023] S5. The vacuum tube is evacuated by the negative pressure device, which then evacuates the air inside the sealing cover, creating a vacuum inside the sealing cover. Once the set vacuum level is reached, the negative pressure device is stopped.

[0024] S6. Start the terminal under test. The terminal under test emits a laser beam into the collimator. The laser beam passes through the sealed optical window on the front of the collimator and is directed to the divergence angle test module, thereby completing the emission angle test.

[0025] S7. Adjust the direction of the terminal under test so that it is aligned with the sealed optical window on the front of the sealing cover. Make the terminal under test emit a laser beam again. After the laser beam passes through the sealed optical window on the front of the sealing cover, it is tested by the output power and wave phase difference test module, thereby completing the test of output power and wave phase difference.

[0026] S8. Open the shut-off valve to equalize the pressure inside the sealing cover with the atmosphere. Then, the servo motor drives the lead screw A to rotate in the opposite direction. At this time, the push-pull mechanism drives the vacuum forming mechanism to move up and reset through the lifting mechanism. Then, it pushes the test terminal bearing mechanism to reset the test terminal.

[0027] The technical effects and advantages of this invention are as follows:

[0028] This invention features a separate vacuum forming mechanism and a test terminal support mechanism, which allows the test terminal to be installed and fixed using the test terminal support mechanism. Since there are no obstructions during the installation and removal process, the installation and removal are less difficult and less time-consuming. In addition, since the sealed cover of the vacuum forming mechanism does not need to reserve the operating space required for installation and removal, only the space for the test terminal to adjust the laser emission direction needs to be reserved, the internal space is relatively small, the required vacuuming time is shorter, and the testing efficiency is significantly improved. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the support mechanism and blocking mechanism of the present invention;

[0031] Figure 3This is a schematic diagram of the lifting mechanism structure of the present invention;

[0032] Figure 4 This is a schematic diagram of the vacuum forming mechanism of the present invention;

[0033] Figure 5 This is a schematic diagram of the test terminal bearing mechanism and push-pull mechanism of the present invention.

[0034] In the diagram: 1. Support mechanism; 11. Support base; 12. Lead screw A; 13. Servo motor; 14. Guide rod A; 15. Fixing plate; 2. Blocking mechanism; 21. Blocking beam; 22. Guide block; 23. Lifting ramp; 3. Lifting mechanism; 31. Fixing frame; 32. Guide rod B; 33. Lead screw B; 34. Gear; 35. Lifting frame; 4. Vacuum forming mechanism; 41. Sealing cover; 42. Parallel light tube; 43. Sealing ring; 44. 45. Vacuum tube; 46. One-way valve; 47. Pressure relief tube; 58. Shut-off valve; 59. Test terminal bearing mechanism; 50. Moving seat A; 51. Clearance channel; 52. Bearing plate; 53. Mounting screw hole; 54. Lower collar; 55. Locking pin; 56. End plate; 57. Upper collar; 58. Return spring; 69. Push-pull mechanism; 60. Moving seat B; 61. Clearance groove; 62. Push-pull plate; 63. Locking groove; 64. Extension rod; 65. Rack. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] This invention provides, for example Figures 1-5 The laser communication terminal vacuum testing system shown includes a support mechanism 1, a blocking mechanism 2 at the top center of the support mechanism 1, a lifting mechanism 3 at the top rear end of the support mechanism 1, a vacuum forming mechanism 4 at the top front of the lifting mechanism 3, a terminal under test carrying mechanism 5 at the inner front end of the support mechanism 1, and a push-pull mechanism 6 connected to the rear side of the terminal under test carrying mechanism 5 and driven by the support mechanism 1.

[0037] like Figure 2As shown, the support mechanism 1 serves as the load-bearing foundation of the entire system, specifically including a support base 11. It adopts a frame structure, is made of high-strength 6061 aluminum alloy, and undergoes anodizing treatment, balancing lightweight design with structural rigidity. This prevents vibration from affecting positioning accuracy during testing and also provides excellent corrosion resistance. A lead screw A12 is nested within the support base 11 via a bearing. A servo motor 13 is fixedly mounted at the front end of the support base 11, and its output shaft is connected to the lead screw A12 via a coupling. Guide rods A14, parallel to the lead screw A12, are fixedly mounted on both sides of the support base 11. Fixing plates 15 are fixedly mounted at both ends of the support base 11 to enhance its overall stability, resisting pressure shocks during vacuum formation and release, and ensuring a safe and reliable testing process.

[0038] By setting up the above structure, the servo motor 13 can drive the lead screw A12 to rotate after starting, and the lead screw A12 can then drive the moving seat B61, which is guided by the guide rod A14, to move forward or backward.

[0039] like Figure 3 As shown, the lifting mechanism 3 includes a fixed frame 31 fixedly mounted on the top rear end of the support base 11. The frame is made of 6063 aluminum alloy and is manufactured using an extrusion molding process. It has a regular and lightweight structure. The frame is reinforced with internal reinforcing ribs to improve its resistance to deformation. A guide rod B32 is fixedly nested on the bottom left side of the fixed frame 31. A lead screw B33, parallel to the guide rod B32, is rotatably nested on the bottom right side of the fixed frame 31 via a bearing. A gear 34 is fixedly sleeved on the outer bottom end of the lead screw B33. A lifting frame 35 is sleeved on the outer sides of the guide rod B32 and the lead screw B33. The lifting frame 35 is made of aerospace-grade 7075 aluminum alloy, which is high in strength and lightweight. It can effectively reduce the load on the lead screw B33 and improve the lifting response speed. The lifting frame 35 is slidably connected to the guide rod B32 in the vertical direction via a linear bearing. The lifting frame 35 is also connected to the lead screw B33 via a transmission connection.

[0040] By setting up the above structure, after the rack 66 meshes with the gear 34, as the rack 66 continues to move backward, the gear 34 drives the lead screw B33 to rotate continuously, which in turn drives the lifting frame 35, which is guided by the guide rod B32, to move continuously downward.

[0041] like Figure 4As shown, the vacuum forming mechanism 4 includes a sealing cover 41 fixedly connected to the front end of the lifting frame 35. The sealing cover 41 is made of aerospace-grade 5A06 aluminum alloy, with anodized and sealed surfaces, exhibiting excellent airtightness, light weight, and high strength. It can withstand pressure differences (≤0.1MPa) in a vacuum environment without deformation. The sealing cover 41 is adapted to the terminal under test. A collimator 42 is fixedly nested on the left side of the sealing cover 41. Both the sealing cover 41 and the collimator 42 are fixedly nested with sealed optical windows made of sapphire glass, which has high hardness, strong wear resistance, and excellent light transmission. The sealing cover 41 has good airtightness and can effectively isolate the vacuum environment from the external test module. The bottom of the sealing cover 41 is bonded with a sealing ring 43 made of fluororubber, which is resistant to high and low temperatures and aging. There is no gas release in the vacuum environment, the sealing performance is durable and reliable, and the service life is long. The vacuum forming mechanism 4 also includes a vacuum tube 44 fixedly installed through the bottom right side of the sealing cover 41. A one-way valve 45 is installed on the vacuum tube 44 and the output end of the vacuum tube 44 is connected to a negative pressure device. A pressure relief pipe 46 is fixedly installed through the top right side of the sealing cover 41 and a shut-off valve 47 is installed on the pressure relief pipe 46.

[0042] By setting the above structure, the sealing cover 41 can be moved down synchronously when the lifting frame 35 moves down, until the sealing cover 41 is pressed against the top of the bearing plate 53 by the sealing ring 43. At this time, the terminal under test is located inside the sealing cover 41, and there is only space between the inner wall of the sealing cover 41 and the terminal under test for the terminal under test to adjust the laser emission direction. At the same time, the current direction of the terminal under test is aligned with the collimator 42. The vacuum tube 44 is evacuated by the negative pressure device, thereby causing the vacuum tube 44 to extract the air inside the sealing cover 41, so that the inside of the sealing cover 41 is in a vacuum state. After the set vacuum degree is reached, the negative pressure device is stopped.

[0043] like Figure 2 As shown, the blocking mechanism 2 includes a blocking beam 21 fixedly installed at the top center of the support base 11. The beam is made of 304 stainless steel, which is rigid and corrosion resistant and can withstand the impact and friction of the end plate for a long time. Multiple guide blocks 22 are fixedly installed on the front of the blocking beam 21. The guide blocks are made of polytetrafluoroethylene reinforced composite material with a friction coefficient ≤0.1 and excellent self-lubricating properties. They can reduce the resistance when in contact with the end plate 57 and avoid wear caused by metal-to-metal contact. Each guide block 22 has a lifting slope 23 on its top.

[0044] like Figure 5As shown, the test terminal support mechanism 5 includes a movable seat A51 slidably sleeved on the outside of two guide rods A14 via linear bearings. A clearance channel 52 for avoiding the lead screw A12 is provided in the center of the front of the movable seat A51. A support plate 53, made of 6061 aluminum alloy, is fixedly mounted on the top of the movable seat A51. The surface is sandblasted to increase friction and improve the installation stability of the test terminal. Mounting screw holes 54 are provided at the four corners of the top of the support plate 53. The test terminal support mechanism 5 also includes a fixed... Two lower collars 55 are located on the back of the movable base A51. A locking pin 56 is slidably provided on the inner side of the lower collar 55 in the vertical direction. The pin is made of 40Cr alloy steel, which has been heat treated to have high strength and good toughness and can withstand the mechanical stress of repeated insertion and removal. An end plate 57 is fixedly connected to the top of the locking pin 56. An upper collar 58 and a return spring 59 are sequentially sleeved on the outer side of the end plate 57 from top to bottom. The upper collar 58 is fixedly connected to the locking pin 56, and the return spring 59 is fixedly connected between the lower collar 55 and the upper collar 58.

[0045] By setting up the aforementioned blocking mechanism 2 and the terminal under test carrying mechanism 5, the terminal under test can be installed at the top center of the carrying plate 53 through the four mounting screw holes 54. Subsequently, when the push-pull plate 63 pulls the locking pin 56 through the locking groove 64, the locking pin 56 drives the moving seat A51 to move backward through the lower collar 55. The moving seat A51 then drives the terminal under test to move backward through the carrying plate 53. As the moving seat A51 moves backward, the lifting slope 23 at the top of the guide block 22 contacts the end plate 57. As the moving seat A51 continues to move backward, the end plate 57 is guided upward by the lifting slope 23. During the upward movement of the end plate 57, the locking pin 56 is driven upward, thereby causing the bottom end of the locking pin 56 to move upward inside the adjacent locking groove 64 until the back of the moving seat A51 contacts the front end of the guide block 22. At this time, the bottom end of the locking pin 56 is pulled out from the inside of the locking groove 64. At this time, the terminal under test is located at the test position directly below the sealing cover 41.

[0046] like Figure 5 As shown, the push-pull mechanism 6 includes a movable seat B61 that is slidably sleeved on the outside of two guide rods A14 via linear bearings and drive sleeved on the outside of the lead screw A12. Both sides of the top of the movable seat B61 are provided with clearance grooves 62. Both sides of the front of the movable seat B61 are fixedly provided with push-pull plates 63 that fit against the back of the movable seat A51. The plates are made of high-strength engineering plastic, which has high strength and good wear resistance, reducing wear when in contact with the movable seat A51 and reducing mechanical impact noise. Each push-pull plate 63 has a locking groove 64 on its top where the end of an adjacent locking pin 56 is inserted. An extension rod 65 is fixedly provided in the middle of the rear side of the movable seat B61, and a rack 66 is fixedly provided on the right side of the extension rod 65.

[0047] By setting the above structure, when the lead screw A12 rotates, it drives the movable seat B61, which is guided by the guide rod A14, to move backward continuously. When the movable seat B61 moves backward, it drives the locking pin 56 to move backward through the push-pull plate 63 and the locking groove 64. As the movable seat B61 moves backward continuously, the movable seat B61 drives the rack 66 to mesh with the gear 34 through the extension rod 65, and then drives the lifting mechanism 3 independently after disconnecting from the test terminal bearing mechanism 5.

[0048] It should also be noted that the present invention further includes a divergence angle testing module (not shown) in which the laser input end is collinear with the front sealed optical window of the collimator 42, and an output power and wave phase difference testing module (not shown) in which the laser input end is collinear with the front sealed optical window of the sealing cover 41. The above-mentioned divergence angle testing module and output power and wave phase difference testing module are all technologies disclosed in the prior art, so they will not be described in detail in this application.

[0049] By setting up the above structure, when the terminal under test emits a laser beam to the collimator 42, the laser beam passes through the sealed optical window on the front of the collimator 42 and is directed to the divergence angle test module, thereby completing the emission angle test. Then, the direction of the terminal under test is adjusted so that it is aligned with the sealed optical window on the front of the sealing cover 41, and the terminal under test emits a laser beam again. After the laser beam passes through the sealed optical window on the front of the sealing cover 41, it is tested by the output power and phase difference test module, thereby completing the output power and phase difference test.

[0050] This invention also discloses a vacuum testing method for a laser communication terminal, implemented using the aforementioned vacuum testing system for a laser communication terminal. The method specifically includes the following steps:

[0051] S1. The terminal under test is installed at the top center of the support plate 53 through four mounting screw holes 54. The servo motor 13 drives the lead screw A12 to rotate. The lead screw A12 drives the moving seat B61, which is guided by the guide rod A14, to move backward continuously. When the moving seat B61 moves backward, the locking pin 56 moves backward through the push-pull plate 63 and the locking groove 64. The locking pin 56 drives the moving seat A51 to move backward through the lower collar 55. The moving seat A51 drives the terminal under test to move backward continuously through the support plate 53.

[0052] S2. As the movable seat A51 moves backward, the lifting ramp 23 at the top of the guide block 22 contacts the end plate 57. As the movable seat A51 continues to move backward, the end plate 57 is guided upward by the lifting ramp 23. During the upward movement of the end plate 57, the locking pin 56 is driven upward, thereby causing the bottom end of the locking pin 56 to move upward inside the adjacent locking groove 64.

[0053] S3. When the back of the moving seat A51 contacts the front end of the guide block 22, the bottom end of the locking pin 56 is pulled out from the inside of the locking groove 64. At this time, the terminal under test is located at the test station directly below the sealing cover 41.

[0054] S4. As the moving base B61 continues to move backward, the moving base B61 drives the rack 66 to mesh with the gear 34 through the extension rod 65. Then, the rack 66 drives the lead screw B33 to rotate through the gear 34, which in turn drives the lifting frame 35, which is guided by the guide rod B32, to move downward continuously. When the lifting frame 35 moves downward, it drives the sealing cover 41 to move downward synchronously until the sealing cover 41 is pressed against the top of the bearing plate 53 by the sealing ring 43. At this time, the terminal under test is located inside the sealing cover 41, and there is only space between the inner wall of the sealing cover 41 and the terminal under test for the terminal under test to adjust the laser emission direction. At the same time, the current direction of the terminal under test is aligned with the parallel light tube 42.

[0055] S5. The vacuum tube 44 is evacuated by the negative pressure device, thereby evacuating the air inside the sealing cover 41 and making the inside of the sealing cover 41 a vacuum. After the set vacuum level is reached, the negative pressure device is stopped.

[0056] S6. Start the terminal under test. The terminal under test emits a laser beam into the collimator 42. The laser beam passes through the sealed optical window on the front of the collimator 42 and is directed towards the divergence angle test module, thereby completing the emission angle test.

[0057] S7. Adjust the direction of the terminal under test so that it is aligned with the sealing optical window on the front of the sealing cover 41. Make the terminal under test emit a laser beam again. After the laser beam passes through the sealing optical window on the front of the sealing cover 41, it is tested by the output power and wave phase difference test module, thereby completing the test of output power and wave phase difference.

[0058] S8. Open the shut-off valve 47 to equalize the pressure inside the sealing cover 41 with the atmosphere. Then, the servo motor 13 drives the lead screw A12 to rotate in the opposite direction. At this time, the push-pull mechanism 6 drives the vacuum forming mechanism 4 to move up and reset through the lifting mechanism 3. Then, it pushes the test terminal bearing mechanism 5 to reset the test terminal.

[0059] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vacuum testing system for a laser communication terminal, characterized in that: It includes a support mechanism (1), a blocking mechanism (2) is provided at the top center of the support mechanism (1), a lifting mechanism (3) is provided at the top rear end of the support mechanism (1), a vacuum forming mechanism (4) is provided at the top front of the lifting mechanism (3), a test terminal bearing mechanism (5) is provided at the front end of the inner side of the support mechanism (1), and a push-pull mechanism (6) that is connected to the support mechanism (1) for transmission is connected to the rear side of the test terminal bearing mechanism (5). The blocking mechanism (2) includes a blocking beam (21) fixedly installed at the top center of the support base (11). Multiple guide blocks (22) are fixedly installed on the front of the blocking beam (21), and a lifting slope (23) is opened on the top of any one of the guide blocks (22). The lifting mechanism (3) includes a fixed frame (31) fixedly installed at the top rear end of the support base (11). A guide rod B (32) is fixedly nested on the bottom left side of the fixed frame (31). A lead screw B (33) parallel to the guide rod B (32) is rotatably nested on the bottom right side of the fixed frame (31) through a bearing. A gear (34) is fixedly sleeved on the bottom outer side of the lead screw B (33). A lifting frame (35) is sleeved on the outer side of the guide rod B (32) and the lead screw B (33). The lifting frame (35) is slidably connected to the guide rod B (32) in the vertical direction through a linear bearing. The lifting frame (35) is connected to the lead screw B (33) in a transmission connection. The vacuum forming mechanism (4) includes a sealing cover (41) fixedly connected to the front end of the lifting frame (35). The test terminal bearing mechanism (5) includes a movable seat A (51) which is slidably sleeved on the outside of two guide rods A (14) via a linear bearing. The movable seat A (51) has a clearance channel (52) in the center of its front for avoiding the lead screw A (12). A bearing plate (53) is fixedly installed on the top of the movable seat A (51). The bearing plate (53) has mounting screw holes (54) at the four corners of its top. The test terminal bearing mechanism (5) further includes two lower collars (55) fixedly disposed on the back of the movable seat A (51). A locking pin (56) is slidably disposed on the inner side of the lower collar (55) in the vertical direction. An end plate (57) is fixedly connected to the top of the locking pin (56). An upper collar (58) and a return spring (59) are sequentially sleeved on the outer side of the end plate (57) from top to bottom. The upper collar (58) is fixedly connected to the locking pin (56). The return spring (59) is fixedly connected between the lower collar (55) and the upper collar (58). The push-pull mechanism (6) includes a movable seat B (61) which is slidably sleeved on the outside of two guide rods A (14) via linear bearings and is drive-sleeved on the outside of lead screw A (12). Both sides of the top of the movable seat B (61) are provided with clearance grooves (62). Both sides of the front of the movable seat B (61) are fixedly provided with push-pull plates (63) that fit against the back of the movable seat A (51). The top of any one of the push-pull plates (63) is provided with a locking groove (64) into which the end of an adjacent locking pin (56) is inserted. An extension rod (65) is fixedly installed in the middle of the rear side of the movable seat B (61), and a rack (66) is fixedly installed on the right side of the extension rod (65). When the back of the movable seat A (51) contacts the front end of the guide block (22), the bottom end of the locking pin (56) is pulled out from the inside of the locking groove (64). At this time, the terminal under test is located in the test position directly below the sealing cover (41). As the movable seat B (61) continues to move backward, the movable seat B (61) drives the rack (66) to mesh with the gear (34) through the extension rod (65).

2. The vacuum testing system for a laser communication terminal according to claim 1, characterized in that: The support mechanism (1) includes a support base (11), and a lead screw A (12) is rotatably nested in the middle of the inner side of the support base (11) via a bearing. A servo motor (13) is fixedly installed at the front end of the support base (11) and is connected to the lead screw A (12) for transmission.

3. The vacuum testing system for a laser communication terminal according to claim 2, characterized in that: The support base (11) has guide rods A (14) that are parallel to the lead screw A (12) fixedly installed on both sides inside, and fixing plates (15) are fixedly installed at both ends of both sides of the support base (11).

4. The vacuum testing system for a laser communication terminal according to claim 3, characterized in that: The sealing cover (41) is adapted to the terminal under test. A parallel light tube (42) is fixedly nested on the left side of the sealing cover (41). Both the sealing cover (41) and the parallel light tube (42) are fixedly nested with a sealing optical window. A sealing ring (43) is glued to the bottom of the sealing cover (41).

5. The vacuum testing system for a laser communication terminal according to claim 4, characterized in that: The vacuum forming mechanism (4) further includes a vacuum tube (44) fixedly installed through the bottom right side of the sealing cover (41). A one-way valve (45) is provided on the vacuum tube (44) and a negative pressure device is connected to the output end of the vacuum tube (44). A pressure relief pipe (46) is fixedly installed through the top right side of the sealing cover (41) and a shut-off valve (47) is provided on the pressure relief pipe (46).

6. The vacuum testing system for a laser communication terminal according to claim 5, characterized in that: It also includes a divergence angle testing module where the laser input end is collinear with the front sealed optical window of the collimator (42) and an output power and wave phase difference testing module where the laser input end is collinear with the front sealed optical window of the sealing cover (41).

7. A vacuum testing method for a laser communication terminal, characterized in that, The method is implemented using a laser communication terminal vacuum testing system as described in claim 6 above, and specifically includes the following steps: S1. The terminal under test is installed at the top center of the support plate (53) through four mounting screw holes (54). The servo motor (13) drives the lead screw A (12) to rotate. The lead screw A (12) drives the moving seat B (61) guided by the guide rod A (14) to move backward continuously. When the moving seat B (61) moves backward, the locking pin (56) is driven to move backward through the push-pull plate (63) and the locking groove (64). The locking pin (56) drives the moving seat A (51) to move backward through the lower collar (55). The moving seat A (51) drives the terminal under test to move backward continuously through the support plate (53). S2. As the moving seat A (51) moves backward, the lifting ramp (23) on the top of the guide block (22) contacts the end plate (57). As the moving seat A (51) continues to move backward, the end plate (57) is guided to rise by the lifting ramp (23). During the rise of the end plate (57), the locking pin (56) is driven to rise, thereby causing the bottom end of the locking pin (56) to move upward inside the adjacent locking groove (64). S3. When the back of the movable seat A (51) contacts the front end of the guide block (22), the bottom end of the locking pin (56) is pulled out from the inside of the locking groove (64). At this time, the terminal under test is located at the test station directly below the sealing cover (41). S4. As the moving seat B (61) continues to move backward, the moving seat B (61) drives the rack (66) to mesh with the gear (34) through the extension rod (65). Then the rack (66) drives the lead screw B (33) to rotate through the gear (34), which in turn drives the lifting frame (35) guided by the guide rod B (32) to move downward continuously. When the lifting frame (35) moves downward, it drives the sealing cover (41) to move downward synchronously until the sealing cover (41) is pressed against the top of the bearing plate (53) through the sealing ring (43). At this time, the terminal under test is located inside the sealing cover (41), and there is only space between the inner wall of the sealing cover (41) and the terminal under test for the terminal under test to adjust the laser emission direction. At the same time, the current direction of the terminal under test is aligned with the parallel light tube (42). S5. The vacuum tube (44) is evacuated by the negative pressure device, thereby causing the vacuum tube (44) to extract the air inside the sealing cover (41) and make the sealing cover (41) a vacuum state. After the set vacuum degree is reached, the negative pressure device is stopped. S6. Start the terminal under test. The terminal under test emits a laser beam into the collimator (42). The laser beam passes through the sealed optical window on the front of the collimator (42) and is directed to the divergence angle test module, thereby completing the emission angle test. S7. Adjust the direction of the terminal under test so that it is aligned with the sealed optical window on the front of the sealing cover (41). Make the terminal under test emit a laser beam again. After the laser beam passes through the sealed optical window on the front of the sealing cover (41), it is tested by the output power and wave phase difference test module, thereby completing the test of output power and wave phase difference. S8. Open the shut-off valve (47) to make the inner cavity of the sealing cover (41) equalize with the atmospheric pressure. Then, the servo motor (13) drives the lead screw A (12) to rotate in the opposite direction. At this time, the push-pull mechanism (6) drives the vacuum forming mechanism (4) to move up and reset through the lifting mechanism (3). Then, the test terminal bearing mechanism (5) is pushed to reset the test terminal.

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