Laser communication terminal vacuum test system and test method thereof

Abstract

The invention discloses a laser communication terminal vacuum test system and a test method thereof, and relates to the technical field of optical detection.The laser communication terminal vacuum test system comprises a supporting mechanism, a blocking mechanism is arranged at the center of the top of the supporting mechanism, a lifting mechanism is arranged at the rear end of the top of the supporting mechanism, and a vacuum forming mechanism is arranged at the top of the front face of the lifting mechanism; a tested terminal bearing mechanism is arranged at the front end of the inner side of the supporting mechanism, and the rear side of the tested terminal bearing mechanism is connected with a push-pull mechanism in transmission connection with the supporting mechanism. No blocking exists in the dismounting and mounting process of the tested terminal, so that the dismounting and mounting difficulty is relatively low, the time consumption is relatively short, in addition, an operation space required for dismounting and mounting does not need to be reserved in the sealing cover in the vacuum forming mechanism, and only a space for the tested terminal to adjust the laser emission direction needs to be reserved, so that the internal space is relatively small, and the working efficiency is relatively high. The required vacuumizing time is shorter, and the test efficiency is 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. 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, a parallel light pipe is fixedly nested on the left side of the sealing cover, the sealing cover and the parallel light pipe are both fixedly nested with a sealed optical window, and a sealing ring is bonded to the bottom of the sealing cover. The measured terminal bearing mechanism comprises a moving seat A arranged outside the two guide rods A through linear bearing sliding sleeve connection, an avoidance 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 at the top corners of the bearing plate.

[0008] 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.

[0009] Preferably, guide rods A parallel to the lead screw A are fixedly arranged on both sides of the inside of the support base, and fixed plates are fixedly arranged at both ends of the two sides of the support base.

[0010] 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 at the top of any one of the guide blocks.

[0011] 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 at the bottom left of the fixed frame, a lead screw B parallel to the guide rod B is rotatably nested at the bottom right of the fixed frame through a bearing, a gear is fixedly sleeved at the outer bottom end of the lead screw B, a lifting frame is jointly sleeved with the guide rod B and the lead screw B outside, 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.

[0012] 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 penetrating the right side top of the sealing cover, and a stop valve is arranged on the pressure relief pipe.

[0013] 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 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.

[0014] 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 two avoiding grooves 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.

[0015] Preferably, the laser communication terminal vacuum test system further comprises a divergence angle test module with the laser input end and the front sealing optical window of the collimator being collinear, and an output power and wave phase difference test module with the laser input end and the front sealing optical window of the sealing cover being collinear.

[0016] The application further discloses a laser communication terminal vacuum test method, which is realized by using the laser communication terminal vacuum test system. S1, the measured terminal is installed on the top center 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; S2, as the moving seat A continuously moves backward, the lifting slope on 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 adjacent locking groove; 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 locking groove, and at this time, the measured terminal is located in the test station below the sealing cover; S4, as the moving seat B continuously moves backward, the moving seat B drives the rack to mesh with the gear through the extension rod, then the rack drives the lead screw B to rotate through the gear, and then the lifting frame guided by the guide rod B continuously moves downward, the sealing cover moves downward synchronously when the lifting frame moves downward, until the sealing cover is pressed on the top of the bearing plate through the sealing ring, at this time, the measured terminal is located in the sealing cover, and only a space for adjusting the laser emission direction of the measured terminal is left between the inner wall of the sealing cover and the measured terminal, and the measured terminal is currently aligned with the collimator. S5, the vacuum pipe is pumped by the negative pressure equipment, so that the vacuum pipe extracts the air inside the sealed cover, so that the inside of the sealed cover is in a vacuum state, and after reaching the set vacuum degree, the negative pressure equipment is stopped; S6, the measured terminal is started, and the measured terminal emits a laser beam to the parallel light pipe, the laser beam is emitted to the divergence angle test module through the sealed optical window on the front of the parallel light pipe, and the emission angle test is completed; S7, the pointing of the measured terminal is adjusted to be aligned with the sealed optical window on the front of the sealed cover, and the measured terminal emits a laser beam again, the laser beam is tested by the output power and wave phase difference test module after passing through the sealed optical window on the front of the sealed cover, and the output power and wave phase difference test are completed; S8, the stop valve is opened, the inner cavity of the sealed cover is balanced with the atmosphere, then the servo motor drives the lead screw A to rotate reversely, at this time, the push-pull mechanism drives the vacuum forming mechanism to move up and reset through the lifting mechanism, then the measured terminal carrying mechanism drives the measured terminal to reset.

[0017] The technical effects and advantages of the present application are as follows:

[0018] The present application is provided with a vacuum forming mechanism and a measured terminal carrying mechanism, which can be installed and fixed by the measured terminal carrying mechanism, and the disassembly process is not blocked, so the disassembly difficulty is low, the time is short, and the internal space of the vacuum forming mechanism is relatively small, so the required vacuum extraction time is shorter, and the test efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the overall structure schematic diagram of the present application; Figure 2 It is the support mechanism and the blocking mechanism structure schematic diagram of the present application; Figure 3 It is the lifting mechanism structure schematic diagram of the present application; Figure 4 It is the vacuum forming mechanism structure schematic diagram of the present application; Figure 5 It is the measured terminal carrying mechanism and the push-pull mechanism structure schematic diagram of the present application.

[0020] In the figure: 1, support mechanism; 11, support base; 12, lead screw A; 13, servo motor; 14, guide rod A; 15, fixed plate; 2, blocking mechanism; 21, blocking beam; 22, guide block; 23, lifting slope; 3, lifting mechanism; 31, fixed frame; 32, guide rod B; 33, lead screw B; 34, gear; 35, lifting frame; 4, vacuum forming mechanism; 41, sealing cover; 42, collimator; 43, sealing ring; 44, vacuum pipe; 45, one-way valve; 46, pressure relief pipe; 47, stop valve; 5, measured terminal bearing mechanism; 51, moving seat A; 52, avoidance channel; 53, bearing plate; 54, mounting screw hole; 55, lower sleeve ring; 56, locking pin; 57, end plate; 58, upper sleeve ring; 59, return spring; 6, push-pull mechanism; 61, moving seat B; 62, avoidance groove; 63, push-pull plate; 64, locking groove; 65, extension rod; 66, rack. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] The present application provides a kind of laser communication terminal vacuum test system as shown in Figures 1-5 The present application provides a kind of laser communication terminal vacuum test system as shown in

[0023] As shown in Figure 2 The support mechanism 1 is used as the bearing base of the whole system, specifically includes the support base 11, adopts the frame structure, the material is high-strength 6061 aluminum alloy, is treated by anodic oxidation, gives consideration to light weight and structural rigidity, can avoid the influence of positioning accuracy due to vibration in the test process, at the same time has good corrosion resistance, the support base 11 inner side middle part is rotationally nested with the lead screw A 12 by bearing, the support base 11 front end is fixedly provided with the servo motor 13, the output shaft of the servo motor 13 is connected with the lead screw A 12 by coupling, the support base 11 inside both sides are fixedly provided with the guide rod A 14 which is parallel to the lead screw A 12, the support base 11 both sides both ends are fixedly provided with the fixed plate 15, for strengthening the overall stability of the support base 11, can resist the air pressure impact in the process of vacuum forming and releasing, guarantees the safety and reliability of the test process.

[0024] By setting the above structure, the servo motor 13 drives the lead screw A12 to rotate after starting, and the lead screw A12 drives the moving seat B61 guided by the guide rod A14 to move forward or backward.

[0025] As shown in Figure 3 The lifting mechanism 3 includes a fixed frame 31 fixedly arranged at the top rear end of the support base 11, made of 6063 aluminum alloy, and formed by extrusion molding process, with regular structure and light weight, and the inside of the frame is additionally provided with a reinforcing rib to improve the deformation resistance. The fixed frame 31 is fixedly nested with a guide rod B32 at the bottom left side, and rotatably nested with a lead screw B33 parallel to the guide rod B32 at the bottom right side. The outer bottom end of the lead screw B33 is fixedly sleeved with a gear 34, and the guide rod B32 and the outer side of the lead screw B33 are jointly sleeved with a lifting frame 35 made of aviation-grade 7075 aluminum alloy, which has high strength and light weight, can effectively reduce the load of the lead screw B33, and improve the lifting response speed. The lifting frame 35 is slidingly connected with the guide rod B32 in the vertical direction through a linear bearing, and the lifting frame 35 is drivingly connected with the lead screw B33.

[0026] By setting the above structure, after the rack 66 is engaged with the gear 34, the gear 34 continuously rotates the lead screw B33 as the rack 66 continues to move backward, thereby continuously driving the lifting frame 35 guided by the guide rod B32 to move downward.

[0027] As shown in Figure 4 The vacuum forming mechanism 4 includes a sealing cover 41 fixedly connected to the front end of the lifting frame 35, made of aviation-grade 5A06 aluminum alloy, and treated by anodizing and sealing on the surface, with excellent airtightness, light weight and high strength, and can withstand the pressure difference (≤0.1MPa) in the vacuum environment without deformation. The sealing cover 41 is adapted to the terminal to be tested, and the left side of the sealing cover 41 is fixedly nested with a parallel light pipe 42. The sealing cover 41 and the parallel light pipe 42 are both fixedly nested with a sealed optical window made of sapphire glass, which has high hardness, strong wear resistance, excellent light transmission and airtightness, can effectively isolate the vacuum environment and the external test module, and has long service life. The bottom of the sealing cover 41 is bonded with a sealing ring 43 made of fluororubber, which is resistant to high and low temperature, aging, and has no air leakage phenomenon in the vacuum environment, with durable and reliable sealing performance. The vacuum forming mechanism 4 further includes an evacuation pipe 44 fixedly penetratingly arranged at the right bottom of the sealing cover 41, and provided with a one-way valve 45 and a negative pressure device connected to the output end of the evacuation pipe 44. A pressure relief pipe 46 is fixedly penetratingly arranged at the right top of the sealing cover 41, and provided with a stop valve 47.

[0028] By setting the above structure, the sealing cover 41 is lowered synchronously when the lifting frame 35 is lowered, until the sealing cover 41 is pressed on the top of the bearing plate 53 by the sealing ring 43. At this time, the measured terminal is located inside the sealing cover 41, and only a space for adjusting the laser emission direction of the measured terminal is left between the inner wall of the sealing cover 41 and the measured terminal. At the same time, the measured terminal is currently aligned with the collimator 42. The vacuum pipe 44 is pumped by the negative pressure equipment, so that the air inside the sealing cover 41 is pumped out, and the inside of the sealing cover 41 is in a vacuum state. After reaching the set vacuum degree, the negative pressure equipment is stopped.

[0029] As shown in Figure 2 The blocking mechanism 2 includes a blocking beam 21 fixedly arranged at the top center of the support base 11. The material is 304 stainless steel, which is strong in rigidity and resistant to corrosion, and can withstand the impact and friction of the end plate for a long time. A plurality of guide blocks 22 are fixedly arranged on the front surface of the blocking beam 21. The material is polytetrafluoroethylene reinforced composite material, the friction coefficient is ≤0.1, and the self-lubricating performance is excellent, which can reduce the resistance when contacting with the end plate 57 and avoid wear caused by metal contact. A lifting inclined surface 23 is formed at the top of any one of the guide blocks 22.

[0030] As shown in Figure 5 The measured terminal bearing mechanism 5 includes a moving seat A51 arranged outside the two guide rods A14 through a linear bearing sliding sleeve. The moving seat A51 is provided with an avoidance channel 52 for avoiding the lead screw A12 in the middle of the front surface. The moving seat A51 is provided with a bearing plate 53 fixedly arranged at the top. The material is 6061 aluminum alloy, and the surface is sandblasted to increase the friction and improve the installation stability of the measured terminal. The bearing plate 53 is provided with a mounting screw hole 54 at the top of each corner. The measured terminal bearing mechanism 5 further includes two lower sleeves 55 fixedly arranged on the back surface of the moving seat A51. The lower sleeve 55 is provided with a locking pin 56 slidingly arranged inside in the vertical direction. The material is 40Cr alloy steel, which is quenched and tempered, high in strength and good in toughness, and can withstand repeated mechanical stress of plugging. The locking pin 56 is fixedly connected with an end plate 57 at the top end. The upper sleeve 58 and the reset spring 59 are sequentially sleeved and arranged outside the end plate 57 from top to bottom. The upper sleeve 58 is fixedly connected with the locking pin 56. The reset spring 59 is fixedly connected between the lower sleeve 55 and the upper sleeve 58.

[0031] By setting the above blocking mechanism 2 and the terminal under test carrying mechanism 5, the terminal under test can be installed on the top center of the carrying plate 53 through four mounting screw holes 54. When the push-pull plate 63 pulls the locking pin 56 through the locking slot 64, the locking pin 56 is driven to move backward by the lower sleeve 55, and the moving seat A51 is driven to continuously move backward by the carrying plate 53. With the continuous backward movement of the moving seat A51, the lifting slope 23 on the top of the guide block 22 contacts the end plate 57. With the continuous backward movement of the moving seat A51, the end plate 57 is guided to rise by the lifting slope 23. The end plate 57 rises to drive the locking pin 56 to rise, and then the bottom end of the locking pin 56 moves upward in the adjacent locking slot 64. 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 extracted from the inside of the locking slot 64. At this time, the terminal under test is located in the test station directly below the sealing cover 41.

[0032] As shown in Figure 5 The push-pull mechanism 6 includes a moving seat B61 which is slidably connected to the outside of the two guide rods A14 and is drivingly connected to the outside of the lead screw A12. The moving seat B61 is provided with avoiding slots 62 on the top of both sides, and the push-pull plates 63 are fixedly arranged on the front sides of both sides of the moving seat B61 and are in contact with the back of the moving seat A51. The material is high-strength engineering plastic, which has high strength and good wear resistance, can reduce the wear when contacting with the moving seat A51, and can reduce the mechanical impact noise. The top of any one of the push-pull plates 63 is provided with a locking slot 64 into which the end of the adjacent locking pin 56 is inserted. The moving seat B61 is fixedly provided with an extension rod 65 on the middle of the back, and the extension rod 65 is fixedly provided with a rack 66 on the right side.

[0033] By setting the above structure, when the lead screw A12 rotates, the moving seat B61 guided by the guide rod A14 continuously moves backward. When the moving seat B61 moves backward, the locking pin 56 is driven to move backward by the push-pull plate 63 and the locking slot 64. With the continuous backward movement of the moving seat B61, the moving seat B61 drives the rack 66 to engage with the gear 34 through the extension rod 65, and then drives the lifting mechanism 3 alone after disconnecting with the terminal under test carrying mechanism 5.

[0034] It should be noted that the present application also includes a divergence angle test module (not shown) whose laser input end is collinear with the front sealing optical window of the parallel light pipe 42, and an output power and wave phase difference test module (not shown) whose laser input end is collinear with the front sealing optical window of the sealing cover 41. The above divergence angle test module and output power and wave phase difference test module belong to the existing scheme disclosed technology, so this application will not be described again.

[0035] By setting the above structure, when the terminal to be measured emits a laser beam to the parallel light tube 42, the laser beam is emitted to the divergence angle test module through the sealed optical window on the front of the parallel light tube 42, and then the emission angle test is completed. Subsequently, the pointing of the terminal to be measured is adjusted to be aligned with the sealed optical window on the front of the sealed cover 41, and the terminal to be measured emits a laser beam again. The laser beam is tested by the output power and wave phase difference test module after passing through the sealed optical window on the front of the sealed cover 41, and then the output power and wave phase difference test is completed.

[0036] The application also discloses a laser communication terminal vacuum test method, which is realized by using the laser communication terminal vacuum test system. S1, install the terminal to be measured on the top center of the bearing plate 53 through the four mounting screw holes 54, drive the lead screw A12 to rotate by the servo motor 13, and drive the moving seat B61 guided by the guide rod A14 to continuously move backward. When the moving seat B61 moves backward, the moving seat B61 drives the locking pin 56 to move backward through the push-pull plate 63 and the locking groove 64, and the locking pin 56 drives the moving seat A51 to move backward through the lower sleeve ring 55, and the moving seat A51 drives the terminal to be measured to continuously move backward through the bearing plate 53. S2, as the moving seat A51 continuously moves backward, the lifting slope 23 on the top of the guide block 22 is in contact with the end plate 57, and as the moving seat A51 continues to move backward, the end plate 57 is guided to rise by the lifting slope 23. The end plate 57 drives the locking pin 56 to rise in the process of rising, and then the bottom end of the locking pin 56 moves upward in the adjacent locking groove 64. S3, when the back of the moving seat A51 is in contact with the front end of the guide block 22, the bottom end of the locking pin 56 is extracted from the inside of the locking groove 64, and at this time, the terminal to be measured is located in the test station directly below the sealed cover 41. S4, as the moving seat B61 continues to move backward, the moving seat B61 drives the rack 66 to engage with the gear 34 through the extension rod 65, and then the rack 66 drives the lead screw B33 to rotate through the gear 34, and then drives the lifting frame 35 guided by the guide rod B32 to continuously move downward. When the lifting frame 35 moves downward, the sealed cover 41 moves downward synchronously, and the sealed cover 41 is pressed on the top of the bearing plate 53 through the sealing ring 43. At this time, the terminal to be measured is located in the sealed cover 41, and only a space for adjusting the laser emission direction of the terminal to be measured is left between the inner wall of the sealed cover 41 and the terminal to be measured, and the current pointing of the terminal to be measured is aligned with the parallel light tube 42. S5, the vacuum pipe 44 is pumped by the negative pressure equipment, so that the air in the sealed cover 41 is pumped out, and the inside of the sealed cover 41 is in a vacuum state. After reaching the set vacuum degree, the negative pressure equipment is stopped. S6, start the terminal to be measured, the terminal to be measured emits laser beam to the parallel light pipe 42, the laser beam is shot to the divergence angle test module through the sealed optical window in front of the parallel light pipe 42, and then the test of emission angle is completed; S7, adjust the pointing of the terminal to be measured to be aligned with the sealed optical window in front of the sealed cover 41, make the terminal to be measured emit laser beam again, the laser beam is tested by the output power and wave phase difference test module after passing through the sealed optical window in front of the sealed cover 41, and then the test of output power and wave phase difference is completed; S8, open the stop valve 47, make the inner cavity of the sealed cover 41 and the atmosphere equal pressure, then make the servo motor 13 drive the lead screw A12 reverse rotation, 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 push the terminal to be measured carrying mechanism 5 to drive the terminal to be measured to reset.

[0037] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can be modified to the technical scheme recorded in the foregoing embodiments, or equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A laser communication terminal vacuum test system, characterized by: The application relates to a support mechanism (1) provided with a blocking mechanism (2) at the top center, a lifting mechanism (3) at the top rear end, a vacuum forming mechanism (4) at the front top, a measured terminal bearing mechanism (5) at the inner side front end, and a push-pull mechanism (6) in transmission connection with the support mechanism (1) at the rear side of the measured terminal bearing mechanism (5). The vacuum forming mechanism (4) comprises a sealing cover (41) fixedly connected to the front end of a lifting frame (35), the sealing cover (41) is matched with a measured terminal, parallel light tubes (42) are fixedly nested at the left side of the sealing cover (41), sealing optical windows are fixedly nested on the sealing cover (41) and the parallel light tubes (42), and sealing rings (43) are bonded to the bottom of the sealing cover (41). The measured terminal bearing mechanism (5) comprises a moving seat A (51) slidably sleeved on the outer sides of two guide rods A (14) through linear bearings, an avoiding channel (52) for avoiding a lead screw A (12) is formed in the front middle part of the moving seat A (51), a bearing plate (53) is fixedly arranged at the top of the moving seat A (51), and mounting screw holes (54) are formed at the top of the four corners of the bearing plate (53).

2. The vacuum test system for a laser communication terminal according to claim 1, wherein: The support mechanism (1) comprises a support base (11), a lead screw A (12) is rotatably nested in the middle of the inner side of the support base (11) through a bearing, and a servo motor (13) in transmission connection with the lead screw A (12) is fixedly arranged at the front end of the support base (11).

3. The vacuum test system for a laser communication terminal according to claim 2, wherein: Linear guide rods A (14) which are parallel to the lead screw A (12) are fixedly arranged at the two sides in the support base (11), and fixed plates (15) are fixedly arranged at the two ends of the two sides of the support base (11).

4. The vacuum test system for a laser communication terminal according to claim 3, wherein: The blocking mechanism (2) comprises a blocking cross beam (21) fixedly arranged at the top center of the support base (11), a plurality of guide blocks (22) are fixedly arranged on the front side of the blocking cross beam (21), and lifting inclined surfaces (23) are formed in the top of any one of the guide blocks (22).

5. The vacuum test system for a laser communication terminal according to claim 4, wherein: The lifting mechanism (3) comprises a fixed frame (31) fixedly arranged at the top rear end of the support base (11), a guide rod B (32) is fixedly nested at the bottom left side of the fixed frame (31), a lead screw B (33) which is parallel to the guide rod B (32) is rotatably nested at the bottom right side of the fixed frame (31) through a bearing, a gear (34) is fixedly sleeved and arranged at the outer bottom end of the lead screw B (33), a lifting frame (35) is jointly sleeved and arranged on the outer sides of the guide rod B (32) and the lead screw B (33), the lifting frame (35) is slidably connected with the guide rod B (32) in the vertical direction through a linear bearing, and the lifting frame (35) is in transmission connection with the lead screw B (33).

6. The vacuum test system for a laser communication terminal according to claim 5, wherein: The vacuum forming mechanism (4) further comprises an evacuation pipe (44) fixedly and penetratingly arranged at the right bottom of the sealing cover (41), a one-way valve (45) is arranged on the evacuation pipe (44), and a negative pressure device is connected to the output end of the evacuation pipe (44); a pressure relief pipe (46) is fixedly and penetratingly arranged at the right top of the sealing cover (41), and a stop valve (47) is arranged on the pressure relief pipe (46).

7. The vacuum test system for a laser communication terminal according to claim 6, wherein: The measured terminal bearing mechanism (5) further comprises two lower sleeves (55) fixedly arranged at the back of the moving seat A (51), lock pins (56) are slidingly arranged inside the lower sleeves (55) in the vertical direction, end plates (57) are fixedly connected to the top ends of the lock pins (56), upper sleeves (58) and return springs (59) are sequentially and sleevedly arranged outside the end plates (57) from top to bottom, the upper sleeves (58) are fixedly connected with the lock pins (56), and the return springs (59) are fixedly connected between the lower sleeves (55) and the upper sleeves (58).

8. The vacuum test system for a laser communication terminal according to claim 7, wherein: The push-pull mechanism (6) comprises a moving seat B (61) slidingly and sleevedly arranged outside the two guide rods A (14) and drivingly and sleevedly arranged outside the lead screw A (12), the top of the moving seat B (61) is provided with two avoiding grooves (62) at both sides, the front of the moving seat B (61) is fixedly provided with two push-pull plates (63) abutting against the back of the moving 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 lock pin (56) is inserted, and the middle of the back of the moving seat B (61) is fixedly provided with an extension rod (65), and the right side of the extension rod (65) is fixedly provided with a rack (66).

9. The vacuum test system for a laser communication terminal according to claim 8, wherein: The system further comprises a divergence angle test module with the laser input end and the front sealing optical window of the collimator (42) being collinear, and an output power and wave phase difference test module with the laser input end and the front sealing optical window of the sealing cover (41) being collinear.

10. A method of vacuum testing a laser communication terminal, the method comprising: The method is implemented by using the laser communication terminal vacuum test system in claim 9, and specifically comprises the following steps: S1, the measured terminal is installed at the top center of the bearing plate (53) through the 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 continuously move backward, the moving seat B (61) moves backward to drive the lock pin (56) to move backward through the push-pull plate (63) and the locking groove (64), the lock pin (56) drives the moving seat A (51) to move backward through the lower sleeve (55), and the moving seat A (51) drives the measured terminal to continuously move backward through the bearing plate (53); S2, as the moving seat A (51) continuously moves backward, the lifting slope (23) at the top of the guide block (22) is in contact with the end plate (57), as the moving seat A (51) continuously moves backward, the end plate (57) is guided to rise by the lifting slope (23), the end plate (57) drives the lock pin (56) to rise in the rising process, and then the bottom end of the lock pin (56) moves upward in the adjacent locking groove (64). S3, when the back of the moving seat A (51) is in contact with the front end of the guide block (22), the bottom end of the locking pin (56) is extracted from the inner side of the locking groove (64), and at this time the measured terminal is located in 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 engage with the gear (34) through the extension rod (65), and then the rack (66) drives the lead screw B (33) to rotate through the gear (34), and in turn drives the lifting frame (35) guided by the guide rod B (32) to continue to move downward, when the lifting frame (35) moves downward, the sealing cover (41) moves downward synchronously, until the sealing cover (41) is pressed on the top of the bearing plate (53) through the sealing ring (43), at this time the measured terminal is located in the sealing cover (41), and only a space for adjusting the laser emission direction of the measured terminal is left between the inner wall of the sealing cover (41) and the measured terminal, and the measured terminal is currently pointing to and parallel to the collimator (42); S5, the vacuumizing pipe (44) is pumped by the negative pressure equipment, and then the air in the sealing cover (41) is pumped out by the vacuumizing pipe (44), so that the inside of the sealing cover (41) is in a vacuum state, and after reaching the set vacuum degree, the negative pressure equipment is stopped; S6, start the measured terminal, the measured terminal emits a laser beam to the collimator (42), and the laser beam is emitted to the divergence angle test module through the sealing optical window in front of the collimator (42), and then the emission angle test is completed; S7, adjust the pointing of the measured terminal to align with the sealing optical window in front of the sealing cover (41), and then emit the laser beam again, and the laser beam is tested by the output power and wave phase difference test module after passing through the sealing optical window in front of the sealing cover (41), and then the output power and wave phase difference test is completed; S8, open the stop valve (47) to equalize the pressure in the sealing cover (41) with the atmosphere, and then drive the lead screw A (12) in reverse by the servo motor (13), at this time the push-pull mechanism (6) drives the vacuum forming mechanism (4) to move upward and reset through the lifting mechanism (3), and then the measured terminal is reset by the measured terminal carrying mechanism (5).

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