Lower turntable door for wind tunnel test

Abstract

The utility model provides a lower turntable door for a wind tunnel test, and relates to the technical field of wind tunnel tests. Comprising a lower turntable door bracket and a lower turntable door, the lower turntable door is sleeved with a positioning steel sleeve, the positioning steel sleeve is sleeved with a plane bearing and a plane bearing supporting table, and the plane bearing is arranged at the top of the plane bearing supporting table; the automatic opening and closing device further comprises a lower rotating disc door driving device and an automatic opening and closing device body. The lower rotating disc door driving device comprises a rotating servo motor and a first worm. The plane bearing is fixedly sleeved with a first worm wheel, and the first worm wheel is meshed with the first worm. By the adoption of the lower rotating disc door, high rotating angle precision and rotating angle repeatability precision can be achieved, it is guaranteed that the lower rotating disc door rotates stably and conveniently, and better concentricity and sealing performance are achieved; and the automatic opening and closing device has the advantages of simple structure, quick response, accurate positioning and the like, and can realize the opening and closing automation of the lower turntable door, so that the replacement and maintenance of the lower turntable door are more convenient and quicker, and the efficiency of test preparation work is improved.

Description

Technical Field

[0001] This utility model relates to the field of wind tunnel testing technology, and more specifically, to a lower rotary door for wind tunnel testing. Background Technology

[0002] The lower turntable door of the NF-3 wind tunnel's binary test section supports the model and, driven by the lower turntable door drive device, allows the model to change various angles within the wind tunnel to meet various test requirements. Current testing requires the lower turntable door to rotate and automatically open and close for replacement and maintenance. However, the existing device has poor angular accuracy and repeatability when driving the lower turntable door, and the rotation is not smooth enough. Furthermore, replacing and maintaining the lower turntable door is cumbersome, time-consuming, and labor-intensive. Utility Model Content

[0003] The purpose of this invention is to provide a lower rotary door for wind tunnel testing, which can achieve high angular accuracy and repeatability, ensuring smooth and easy rotation of the lower rotary door, as well as better concentricity and sealing, thereby guaranteeing the accuracy and repeatability of the binary model test. Moreover, the automatic opening and closing device has the advantages of simple structure, fast response, and accurate positioning, which can realize the automation of the opening and closing of the lower rotary door, making the replacement and maintenance of the lower rotary door more convenient and quick, and improving the efficiency of test preparation.

[0004] The technical solution adopted in this utility model is as follows:

[0005] This application provides a lower rotary door for wind tunnel testing, including a lower rotary door bracket and a lower rotary door located on top of the lower rotary door bracket. A positioning steel sleeve is fitted around the lower rotary door, and a plane bearing and a plane bearing support are fitted on the positioning steel sleeve. The plane bearing is located on top of the plane bearing support. The application also includes a lower rotary door drive device and automatic opening and closing devices located on the east and west sides of the lower rotary door bracket. The lower rotary door drive device includes a rotary servo motor and a first worm gear located at the drive end of the rotary servo motor. A first worm wheel is fixedly fitted on the plane bearing, and the first worm wheel meshes with the first worm gear.

[0006] Furthermore, in some embodiments of this utility model, the automatic opening and closing device includes a lifting mechanism, a translation mechanism one, and a translation mechanism two, with the translation mechanism one and the translation mechanism two spaced apart, and the lower turntable door located between the translation mechanism one and the translation mechanism two; the number of lifting mechanisms is two and they are respectively located at the bottom of the translation mechanism one and the translation mechanism two;

[0007] Each lifting mechanism includes two vertically arranged lifting screws and a threaded lifting block threaded onto the lifting screws. A crossbeam is connected between the threaded lifting blocks on both sides. The crossbeam is located below the translation mechanism one and the translation mechanism two. The threaded lifting block is rotatably mounted on the crossbeam. It also includes a lifting servo motor and a second worm gear located at the drive end of the lifting servo motor. The threaded lifting block is fixedly fitted with a second worm wheel, and the second worm wheel meshes with the second worm gear.

[0008] Furthermore, in some embodiments of this utility model, the translation mechanism includes a translation transmission screw, a push rod, and two parallel slide rail bases. The translation transmission screw and the push rod are parallel to each other and perpendicular to the slide rail bases. The translation transmission screw is threaded with two sliding nuts, and the push rod is slidably fitted with two sliding sleeves. It also includes two rotatably arranged thrust connecting rods, which are arranged in an X-shape. One end of the thrust connecting rod is rotatably connected to the sliding nut, and the other end of the thrust connecting rod is rotatably connected to the sliding sleeve.

[0009] Both slide rail bases have a slider 1 slidably mounted on their bottoms via dovetail grooves, and the two ends of the push rod 1 are respectively connected to the slider 1; the lifting screw corresponding to the lifting mechanism located at the bottom of the translation mechanism 1 is fixed to the bottom of the slider 1.

[0010] Furthermore, in some embodiments of this utility model, the translation mechanism one also includes a translation servo motor one and an active bevel gear disposed at the drive end of the translation servo motor one, and a passive bevel gear is fixedly sleeved on the translation transmission screw one, and the translation servo motor one and the translation transmission screw one are connected by bevel gear transmission.

[0011] Furthermore, in some embodiments of this utility model, the translation mechanism two includes a push rod two, a translation transmission screw two, and a translation servo motor two. The translation transmission screw two passes through the push rod two and is threadedly connected to the push rod two. The driving end of the translation servo motor two is provided with an active bevel gear, and the translation transmission screw two is fixedly sleeved with a passive bevel gear. The translation servo motor two and the translation transmission screw two are connected by bevel gear transmission.

[0012] It also includes two parallel slide rail bases, each with a slider 2 slidably mounted on its bottom via a dovetail groove. The two ends of the push rod 2 are respectively connected to the slider 2. The lifting screw corresponding to the lifting mechanism located at the bottom of the translation mechanism 2 is fixed to the bottom of the slider 2.

[0013] Furthermore, in some embodiments of this utility model, the automatic opening and closing device also includes a hoisting mechanism. The crossbeam is provided with an extension plate. The hoisting mechanism includes a hoisting slider that is slidably disposed on the extension plate through a dovetail groove. The hoisting slider is threadedly connected to a hoisting transmission screw. The crossbeam is provided with a hoisting servo motor. The drive end of the hoisting servo motor is provided with an active bevel gear. The hoisting transmission screw is fixedly sleeved with a passive bevel gear. The hoisting servo motor and the hoisting transmission screw are connected by bevel gear transmission.

[0014] Furthermore, in some embodiments of this utility model, the automatic opening and closing device further includes a positioning and locking mechanism. The positioning and locking mechanism includes a positioning and locking servo motor one, a positioning and locking servo motor two, a positioning pin, and a positioning and locking slide rail. The positioning and locking slide rail is slidably provided with a positioning and locking slider through a dovetail groove. The positioning and locking slider is threadedly connected to a positioning and locking transmission screw. One end of the positioning and locking transmission screw is connected to the drive end of the positioning and locking servo motor one through a bevel gear transmission. The positioning and locking servo motor two is located below the positioning and locking slider. The drive end of the positioning and locking servo motor two is provided with a positioning and locking threaded shaft. The positioning pin is sleeved on the end of the positioning and locking threaded shaft away from the positioning and locking servo motor two, and the positioning pin is threadedly connected to the positioning and locking threaded shaft.

[0015] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:

[0016] This utility model provides a lower rotary door for wind tunnel testing, including a lower rotary door bracket and a lower rotary door located on top of the bracket. A positioning steel sleeve is fitted around the lower rotary door, and the positioning steel sleeve houses a planar bearing and a planar bearing support. The planar bearing is located on top of the planar bearing support. The system also includes a lower rotary door drive device and automatic opening and closing devices located on the east and west sides of the lower rotary door bracket. The lower rotary door drive device includes a rotary servo motor and a first worm gear located at the drive end of the rotary servo motor. A first worm wheel is fixedly fitted onto the planar bearing, and the first worm wheel meshes with the first worm gear. This design achieves high angular accuracy and repeatability, ensuring smooth and easy rotation of the lower rotary door, as well as better concentricity and sealing, thereby guaranteeing the accuracy and data repeatability of the binary model test. Furthermore, the automatic opening and closing device has advantages such as simple structure, fast response, and accurate positioning, enabling automated opening and closing of the lower rotary door, making replacement and maintenance of the lower rotary door more convenient and faster, and improving the efficiency of test preparation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A bottom view of the lower rotary door for wind tunnel testing provided in an embodiment of this utility model;

[0019] Figure 2 A longitudinal partial sectional view of the lower rotary door for wind tunnel testing provided in an embodiment of this utility model;

[0020] Figure 3 A bottom view showing the position of the lower turntable door drive device according to an embodiment of this utility model;

[0021] Figure 4 A bottom view of a position of the translation mechanism provided in an embodiment of this utility model;

[0022] Figure 5 A partial cross-sectional view of the position of slider 1 in a translation mechanism provided in an embodiment of this utility model;

[0023] Figure 6 A bottom view of the second position of the translation mechanism provided in this embodiment of the utility model;

[0024] Figure 7 A partial cross-sectional view of the position of slider two in the translation mechanism two provided in this embodiment of the utility model;

[0025] Figure 8 A bottom view of the hoisting mechanism provided in an embodiment of this utility model;

[0026] Figure 9 A front view of the positioning and locking mechanism provided in an embodiment of this utility model;

[0027] Figure 10 A bottom view of the positioning and locking mechanism provided in an embodiment of this utility model.

[0028] Icons: 1-Lower turntable door bracket; 2-Lower turntable door; 3-Positioning steel sleeve; 4-Plane bearing; 5-Plane bearing support; 6-Rotary servo motor; 7-First worm gear; 8-First worm wheel; 9-Lifting screw; 10-Threaded lifting block; 11-Crossbeam; 12-Lifting servo motor; 13-Second worm gear; 14-Second worm wheel; 15-Translation transmission screw one; 16-Push rod one; 17-Slide rail base one; 18-Sliding nut; 19-Sliding sleeve; 20-Thrust connecting rod; 21-Slider one ; 22-Translation servo motor one; 23-Push rod two; 24-Translation transmission screw two; 25-Translation servo motor two; 26-Slide rail base two; 27-Slider two; 28-Extension plate; 29-Lifting slider; 30-Lifting transmission screw; 31-Lifting servo motor; 32-Positioning locking servo motor one; 33-Positioning locking servo motor two; 34-Positioning pin; 35-Positioning locking transmission screw; 36-Positioning locking slide rail; 37-Positioning locking slider; 38-Positioning locking threaded shaft. Detailed Implementation

[0029] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0030] Example

[0031] Please refer to Figures 1-10 This embodiment provides a lower rotary door for wind tunnel testing, including a lower rotary door bracket 1 and a lower rotary door 2 located on top of the lower rotary door bracket 1. A positioning steel sleeve 3 is fitted around the lower rotary door 2, and a plane bearing 4 and a plane bearing support 5 are fitted onto the positioning steel sleeve 3. The plane bearing 4 is located on top of the plane bearing support 5. The embodiment also includes a lower rotary door drive device and automatic opening and closing devices located on the east and west sides of the lower rotary door bracket 1. The automatic opening and closing devices are used for the automatic opening and closing operation of the lower rotary door 2, and are connected to the lower rotary door 2 through the lower rotary door bracket 1. The lower rotary door drive device includes a rotary servo motor 6 and a first worm gear 7 located at the drive end of the rotary servo motor 6. A first worm wheel 8 is fixedly fitted onto the plane bearing 4, and the first worm wheel 8 meshes with the first worm gear 7. In this embodiment, the rotary servo motor 6 drives the first worm gear 7 to rotate, and the rotating first worm gear 7 drives the first worm wheel 8, the plane bearing 4, the positioning steel sleeve 3, and the lower rotary door 2 to rotate, adjusting the angle of the lower rotary door 2.

[0032] In this embodiment, the wind tunnel axis of the lower turntable door drive device is located on the north side of the lower turntable door 2. The planar bearing 4 is a 90000ZS type double-row tapered roller bearing with tapered rings; this bearing has an upper and lower two-piece structure. The outer circumference of the upper piece of the planar bearing is shaped like a turbine, and the installation method is that the lower piece is fixed while the upper piece rotates. The positioning steel sleeve 3 is fixedly connected to the upper bearing piece, leaving a 1.5mm gap with the lower bearing piece. The outer ring of the lower turntable door 2 and the inner ring of the positioning steel sleeve 3 have a tapered fit for easy opening and closing.

[0033] After the first worm gear 8 meshes with the first worm 7, a worm gear transmission is formed. The rotary servo motor 6 drives the first worm 7 to rotate, and the first worm 7 drives the first worm gear 8 to rotate, thereby driving the lower turntable door 2 to rotate.

[0034] In this embodiment, the thickness of the lower rotary door 2 is 330mm. Inside the rotary door cavity, two reinforcing plates of 750mm and 1500mm are made centered on the center line to increase the strength and rigidity of the rotary door. These two reinforcing plates extend beyond the lower wall panel of the rotary door, serving as support pillars for the bracket. Two steel plates extend beyond the lower wall panel of the rotary door at radii of 800mm and 950mm from the center line, serving as support pillars for the bracket. The support pillars extend into and are welded to the top surface of the rotary door, and are also welded to the lower surface of the rotary door. A support disc is mounted on the top of the support bracket, with an outer diameter slightly larger than the outer diameter of the rotary door. The edges of the support disc are double-layered to allow for the insertion of a lifting slider during installation and opening of the rotary door. A 0.5mm gap is maintained between the thickness of the telescopic slider of the lifting mechanism and the double-layered edges of the support disc.

[0035] In this embodiment, the outer diameter of the flat bearing support 5 is 2800 mm, the inner diameter is 2200 mm, and the thickness is 70 mm. It is welded together and made of 45# steel. The support is installed at the bottom of the binary test section with M20 bolts to support the slewing bearing and the turntable door. Since the support is fixed to the bottom of the test section with bolts, it is detachable, facilitating the maintenance of the slewing bearing.

[0036] like Figures 1-10 As shown, in some embodiments, the automatic opening and closing device includes a lifting mechanism, a translation mechanism one, and a translation mechanism two, with the translation mechanism one and the translation mechanism two spaced apart, and the lower turntable door 2 located between the translation mechanism one and the translation mechanism two; the number of lifting mechanisms is two and they are respectively located at the bottom of the translation mechanism one and the translation mechanism two;

[0037] Each lifting mechanism includes two vertically arranged lifting screws 9 and threaded lifting blocks 10 threadedly sleeved on the lifting screws 9. A crossbeam 11 is connected between the threaded lifting blocks 10 on both sides. The crossbeam 11 is located below the translation mechanism one and the translation mechanism two. The threaded lifting blocks 10 are rotatably mounted on the crossbeam 11. It also includes a lifting servo motor 12 and a second worm gear 13 located at the drive end of the lifting servo motor 12. The threaded lifting blocks 10 are fixedly sleeved with a second worm wheel 14, and the second worm wheel 14 meshes with the second worm gear 13.

[0038] The lifting mechanism in this embodiment is used to drive the lower turntable door 2 to rise and fall. The lifting servo motor 12 drives the second worm wheel 14 and the threaded lifting block 10 to rotate through the second worm 13. At this time, the threaded lifting block 10 can move vertically along the lifting screw 9 to adjust its position. The moving threaded lifting block 10 drives the crossbeam 11 to rise or fall to adjust its position.

[0039] In this embodiment, the lifting mechanism is located at the bottom of the wind tunnel and is connected to the slider of the translation mechanism via a spline joint. There are two sets of lifting mechanisms, located on the east and west sides of the turntable door, respectively. Each set of lifting mechanisms includes two sets of equipment. Each set of equipment consists of a spline joint, pins, lifting screws, threaded lifting blocks, a second worm gear, a second worm, a lifting beam, a connecting beam, a worm support, and a reducer support. The lifting screws of each set of lifting mechanisms are 3100mm apart. Before the lifting mechanism operates, the translation mechanism is first operated to move the lifting mechanism to a fixed position next to the lower turntable door. Then, the lifting mechanism is operated to align the lifting slider 29 of the hoisting mechanism with the double-layered edge of the lower turntable door bracket 1. Then, the hoisting mechanism is operated to insert the hoisting slider into the double-layered edge of the supporting disc. At this point, two situations arise:

[0040] The first method is to loosen the positioning locking mechanism and then operate the lifting mechanism when the lower turntable door needs maintenance after the test. The lifting mechanism will then descend to lower the lower turntable door.

[0041] The second method involves the lower turntable door being in a separated state and requiring installation. The lifting mechanism moves upward, lifting the lower turntable door and placing it in a fixed position. It is then installed in conjunction with the tapered positioning steel sleeve. The positioning locking mechanism is then activated, driving the positioning pins into the positioning holes of the positioning steel sleeve 3 and the lower turntable door 2. The positioning pins secure the lower turntable door and the positioning steel sleeve, at which point the lower turntable door installation is complete.

[0042] like Figures 1-10 As shown, in some embodiments, the translation mechanism includes a translation transmission screw 15, a push rod 16, and two parallel slide rail bases 17. The translation transmission screw 15 and the push rod 16 are parallel to each other and perpendicular to the slide rail bases 17. The translation transmission screw 15 is threaded with two sliding nuts 18, and the push rod 16 is slidably fitted with two sliding sleeves 19. It also includes two rotatably arranged thrust connecting rods 20, which are arranged in an X-shape. One end of the thrust connecting rod 20 is rotatably connected to the sliding nut 18, and the other end of the thrust connecting rod 20 is rotatably connected to the sliding sleeve 19.

[0043] Both slide rail bases 17 have sliders 21 slidably mounted on their bottoms via dovetail grooves, and the two ends of push rod 16 are respectively connected to sliders 21; the lifting screw 9 of the lifting mechanism located at the bottom of the translation mechanism is fixed to the bottom of slider 21.

[0044] The translation mechanism also includes a translation servo motor 22 and an active bevel gear located at the drive end of the translation servo motor 22. A passive bevel gear is fixedly sleeved on the translation transmission screw 15. The translation servo motor 22 and the translation transmission screw 15 are connected by bevel gear transmission.

[0045] This utility model incorporates a translation mechanism, which drives a lifting mechanism below it to adjust its position. In use, a translation servo motor 22 drives a translation transmission screw 15 to rotate. The rotating screw 15 drives two sliding nuts 18 to move closer together or further apart. The two sliding nuts 18 then rotate relative to each other via two thrust rods 20. These two thrust rods 20 push a push rod 16 to move horizontally. The moving push rod 16 causes two sliders 21 to slide, which in turn causes the lifting mechanism connected to its bottom to move horizontally and adjust its position.

[0046] In this embodiment, the translation mechanism is located at the bottom of the binary test section. Two long bases are embedded in the bottom channel steel and welded to the bottom of the test section. Two dovetail grooves are fixed on the bases and are evenly distributed on both sides of the wind tunnel axis, parallel to the center line, with a spacing of 3100. The machining accuracy and straightness of the dovetail grooves and sliders are all 0.01, and the parallelism and levelness of the dovetail groove installation are both 0.03.

[0047] like Figures 1-10As shown, in some embodiments, the translation mechanism two includes a push rod two 23, a translation transmission screw two 24, and a translation servo motor two 25. The translation transmission screw two 24 passes through the push rod two 23 and is threadedly connected to the push rod two 23. The driving end of the translation servo motor two 25 is provided with an active bevel gear, and the translation transmission screw two 24 is fixedly sleeved with a passive bevel gear. The translation servo motor two 25 and the translation transmission screw two 24 are connected by bevel gear transmission. It also includes two parallel slide rail bases two 26. The bottom of each slide rail base two 26 is slidably provided with a slider two 27 through a dovetail groove. The two ends of the push rod two 23 are respectively connected to the slider two 27. The lifting mechanism corresponding to the lifting screw 9 located at the bottom of the translation mechanism two is fixed to the bottom of the slider two 27.

[0048] This utility model incorporates a second translation mechanism, which drives a lower lifting mechanism to adjust its position. In use, a second translation servo motor 25 drives a second translation transmission screw 24 to rotate. The rotating screw 24 drives a second push rod 23 to move horizontally. This push rod 23 then drives two sliders 27 at its ends to slide, and the two sliders 27 cause the lifting mechanism connected to its bottom to move horizontally to adjust its position.

[0049] In this embodiment, the translation mechanism 2 is located at the bottom of the binary test section. Two long bases are embedded in the bottom channel steel and welded to the bottom of the test section. Two dovetail grooves are fixed on the bases and are evenly distributed on both sides of the wind tunnel axis, parallel to the center line, with a spacing of 3100. The machining accuracy and straightness of the dovetail grooves and sliders are all 0.01, and the parallelism and levelness of the dovetail groove installation are both 0.03.

[0050] like Figure 1 and Figure 8 As shown, in some embodiments, the automatic opening and closing device further includes a hoisting mechanism. The crossbeam 11 is provided with an extension plate 28. The hoisting mechanism includes a hoisting slider 29 that is slidably disposed on the extension plate 28 through a dovetail groove. The hoisting slider 29 is threadedly connected to a hoisting transmission screw 30. The crossbeam 11 is provided with a hoisting servo motor 31. The drive end of the hoisting servo motor 31 is provided with an active bevel gear. The hoisting transmission screw 30 is fixedly sleeved with a passive bevel gear. The hoisting servo motor 31 and the hoisting transmission screw 30 are connected by bevel gear transmission.

[0051] The hoisting mechanism in this embodiment is used for hoisting the lower turntable door 2. The hoisting servo motor 31 drives the hoisting transmission screw 30 to rotate, and the rotating hoisting transmission screw 30 drives the hoisting slider 29 to slide.

[0052] In this embodiment, the hoisting mechanism is concealed within the connecting beam and the extension plate. When hoisting the lower turntable door, the translation and lifting mechanisms are first activated to align the dovetail slider with the center of the double-layered edge of the supporting disc. Then, the hoisting mechanism is activated to extend the dovetail slider and insert it into the center of the double-layered edge of the supporting disc. The hoisting operation is then complete. When the lower turntable door does not require hoisting, the servo motor is activated, and the dovetail slider retracts without affecting the operation of the lower turntable door.

[0053] like Figure 9 and Figure 10 As shown, in some embodiments, the automatic opening and closing device further includes a positioning and locking mechanism. The positioning and locking mechanism includes a positioning and locking servo motor 32, a positioning and locking servo motor 33, a positioning pin 34, and a positioning and locking slide rail 36. The positioning and locking slide rail 36 is slidably provided with a positioning and locking slider 37 through a dovetail groove. The positioning and locking slider 37 is threadedly connected to a positioning and locking transmission screw 35. One end of the positioning and locking transmission screw 35 is connected to the drive end of the positioning and locking servo motor 32 through a bevel gear transmission. The positioning and locking servo motor 33 is located on the positioning and locking slider 37. The drive end of the positioning and locking servo motor 33 is provided with a positioning and locking threaded shaft 38. The positioning pin 34 is sleeved on the end of the positioning and locking threaded shaft 38 away from the positioning and locking servo motor 33, and the positioning pin 34 is threadedly connected to the positioning and locking threaded shaft 38.

[0054] The positioning and locking mechanism in this embodiment has two working states;

[0055] Method 1: a) Drive in the positioning pin; b) Move away from the positioning steel sleeve.

[0056] The second method: a) Pull out the positioning pin; b) Move away from the positioning steel sleeve.

[0057] The specific steps are as follows:

[0058] Method 1: When installing the lower turntable door, after the lower turntable door and positioning steel sleeve are in place, the positioning locking mechanism is activated: a) Positioning locking servo motor 1 32 reverses, controlling the positioning locking slider 37 to move linearly. The positioning locking slider 37 drives the positioning locking threaded shaft 38 on it to also move linearly (at this time, the positioning pin 34 is connected to the positioning locking threaded shaft 38). The positioning pin 34 is sent to the positioning hole between the positioning steel sleeve and the lower turntable door. When the positioning pin abuts against the positioning hole, positioning locking servo motor 1 32 stops, and positioning locking servo motor 2 33 reverses, pushing the positioning pin into the positioning hole. Then, the two servo motors cooperate to send the positioning pin completely into the positioning hole. b) The two sets of motors simultaneously rotate forward, the positioning locking threaded shaft 38 retracts the positioning pin 34, and the positioning locking slider 37 also moves back, driving the positioning locking threaded shaft 38 away from the positioning steel sleeve.

[0059] The second method involves activating the positioning and locking mechanism when the turntable door needs to be disassembled: a) Positioning and locking servo motor 1 (32) reverses, controlling the positioning and locking slider 37 to move forward, sending the positioning and locking threaded shaft 38 to the threaded hole of the positioning steel sleeve. When the positioning and locking threaded shaft 38 abuts against the positioning hole, positioning and locking servo motor 2 (33) rotates forward, and the front thread of the positioning and locking threaded shaft 38 enters the internal thread of the positioning pin. b) Positioning and locking servo motor 1 (32) pauses, while positioning and locking servo motor 2 (33) continues to rotate forward, pulling out part of the positioning pin. Then, both servo motors rotate forward simultaneously, pulling out all the positioning pins and moving the positioning and locking slider 37 and the positioning and locking threaded shaft 38 away from the positioning steel sleeve.

[0060] In summary, when installing the lower turntable door 2, first move the lower turntable door 2 on the ground flatbed truck to directly below the plane bearing 4. Then, simultaneously control the translation mechanism one, translation mechanism two, and lifting mechanism to adjust the height between the lifting mechanism beam 11 and the lower turntable door bracket 1, so that the lifting slider 29 of the hoisting mechanism is inserted into the hollow position of the double-layer edge of the lower turntable door bracket 1. Then, control the lifting servo motor 12 of the lifting mechanism to drive forward, raise the lower turntable door 2, and let the lower turntable door 2 be embedded in the positioning steel sleeve 3, aligning the positioning steel sleeve 3 and the positioning hole of the lower turntable door 2. Finally, control the positioning locking mechanism to drive the positioning pin of the positioning locking mechanism into the positioning hole, and the lower turntable door 2 is fixed. Control the positioning locking mechanism again to retract the threaded shaft and the hoisting slider, moving them away from the positioning steel sleeve. The installation of the lower turntable door is now complete. When finishing, first control the hoisting mechanism to retract the hoisting slider, then control the servo motor of the translation mechanism to reverse, and the translation slider will drive the lifting mechanism away from the turntable door position to make room for the test preparation work.

[0061] When the wind tunnel binary test section is not working, or when the lower turntable door 2 needs replacement or maintenance: a) Control the servo motors of translation mechanism one and translation mechanism two to drive forward, so that translation mechanism one and translation mechanism two respectively push out slider one 21 and slider two 27, thereby driving the lifting mechanism closer to the lower turntable door 2; b) Simultaneously adjust the horizontal distance between slider one 21 and slider two 27 of the two translation mechanisms and the lower turntable door 2, and the height of the lifting mechanism, so that the lifting slider 29 of the lifting mechanism hidden in the lifting mechanism connecting beam 11 is close to the lower turntable door. c. The hollow positions of the double-layered edges of bracket 1 can be aligned; d. The hoisting servo motor 31 of the hoisting mechanism drives the hoisting slider 29 to extend and insert into the hollow position of the double-layered edges of the lower turntable door bracket 1, gently contacting the upper edge of the double-layered edges. Then, the lifting servo motor 12 of the lifting mechanism is controlled to slightly raise the crossbeam 11 of the lifting mechanism, so that the lifting mechanism is stressed, reducing the load on the positioning pin and making it easier to pull out; e. The servo motor of the positioning locking mechanism is controlled to pull out the positioning pin, moving it away from the positioning steel sleeve; f. The servo motor of the lifting mechanism is controlled to reverse, the lifting mechanism descends, and the lower turntable door is lowered and placed on a flatbed cart on the ground for maintenance or replacement of the lower turntable door.

[0062] Effects of the utility model:

[0063] This utility model can achieve the following effects:

[0064] 1. Lower turntable door and lower turntable door drive device:

[0065] (1) Improved the turning accuracy and repeatability of the lower rotary door;

[0066] (2) Improved the smoothness and ease of rotation of the lower rotary door;

[0067] (3) Reduced the operating noise of the dual-element rotary door during the test.

[0068] 2. Automatic opening and closing device for the lower rotary table door:

[0069] (1) Improved the efficiency of experimental preparation;

[0070] (2) Improved the safety of experimental preparation;

[0071] (3) It has the advantages of simple structure, fast response and accurate positioning.

[0072] This invention aims to achieve high angular accuracy and repeatability, ensuring smooth and easy rotation of the lower turntable door, as well as better concentricity and sealing, thereby guaranteeing the experimental accuracy and data repeatability of the binary model. The automatic opening and closing device features simple structure, rapid response, and accurate positioning, automating the opening and closing of the turntable door and making the replacement and maintenance of the lower turntable door more convenient and efficient.

[0073] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0074] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A lower rotary gate for wind tunnel testing, characterized in that: The device includes a lower rotary door bracket and a lower rotary door located on top of the lower rotary door bracket. A positioning steel sleeve is fitted around the lower rotary door, and a planar bearing and a planar bearing support are fitted within the positioning steel sleeve. The planar bearing is located on top of the planar bearing support. The device also includes a lower rotary door drive mechanism and an automatic opening and closing mechanism located on the lower rotary door bracket. The lower rotary door drive mechanism includes a rotary servo motor and a first worm gear located at the drive end of the rotary servo motor. A first worm wheel is fixedly fitted around the planar bearing, and the first worm wheel meshes with the first worm gear.

2. The lower rotary gate for wind tunnel testing according to claim 1, characterized in that: The automatic opening and closing device includes a lifting mechanism, a translation mechanism one, and a translation mechanism two. The translation mechanism one and the translation mechanism two are arranged at intervals, and the lower turntable door is located between the translation mechanism one and the translation mechanism two. There are two lifting mechanisms, which are located at the bottom of the translation mechanism one and the translation mechanism two, respectively. Each of the lifting mechanisms includes two vertically arranged lifting screws and a threaded lifting block threaded onto the lifting screws. A crossbeam is connected between the threaded lifting blocks on both sides. The crossbeam is located below the first translation mechanism and the second translation mechanism. The threaded lifting block is rotatably mounted on the crossbeam. The mechanism also includes a lifting servo motor and a second worm gear located at the drive end of the lifting servo motor. A second worm wheel is fixedly mounted on the threaded lifting block, and the second worm wheel meshes with the second worm gear.

3. The lower rotary gate for wind tunnel testing according to claim 2, characterized in that: The translation mechanism includes a translation transmission screw, a push rod, and two parallel slide rail bases. The translation transmission screw and the push rod are parallel to each other and perpendicular to the slide rail bases. The translation transmission screw is threaded with two sliding nuts, and the push rod is slidably fitted with two sliding sleeves. It also includes two rotatably arranged thrust connecting rods, which are arranged in an X-shape. One end of each thrust connecting rod is rotatably connected to the sliding nut, and the other end of each thrust connecting rod is rotatably connected to the sliding sleeve. Both of the slide rail bases have a slider slidably mounted on their bottoms via dovetail grooves, and the two ends of the push rod are respectively connected to the slider; the lifting screw of the lifting mechanism located at the bottom of the translation mechanism is fixed to the bottom of the slider.

4. The lower rotary gate for wind tunnel testing according to claim 3, characterized in that: The translation mechanism 1 also includes a translation servo motor 1 and an active bevel gear located at the drive end of the translation servo motor 1. The translation transmission screw 1 is fixedly sleeved with a passive bevel gear. The translation servo motor 1 and the translation transmission screw 1 are connected by bevel gear transmission.

5. A lower rotary gate for wind tunnel testing according to claim 3, characterized in that: The translation mechanism 2 includes a push rod 2, a translation transmission screw 2, and a translation servo motor 2. The translation transmission screw 2 passes through the push rod 2 and is threadedly connected to the push rod 2. The drive end of the translation servo motor 2 is provided with an active bevel gear, and the translation transmission screw 2 is fixedly sleeved with a passive bevel gear. The translation servo motor 2 and the translation transmission screw 2 are connected by bevel gear transmission. It also includes two parallel slide rail bases, each with a slider 2 slidably mounted on its bottom via a dovetail groove. The two ends of the push rod 2 are respectively connected to the slider 2. The lifting screw corresponding to the lifting mechanism located at the bottom of the translation mechanism 2 is fixed to the bottom of the slider 2.

6. A lower rotary gate for wind tunnel testing according to claim 2, characterized in that: The automatic opening and closing device also includes a hoisting mechanism. The crossbeam is provided with an extension plate. The hoisting mechanism includes a hoisting slider that is slidably disposed on the extension plate through a dovetail groove. The hoisting slider is threadedly connected to a hoisting transmission screw. The crossbeam is provided with a hoisting servo motor. The drive end of the hoisting servo motor is provided with an active bevel gear. The hoisting transmission screw is fixedly sleeved with a passive bevel gear. The hoisting servo motor and the hoisting transmission screw are connected by bevel gear transmission.

7. A lower rotary gate for wind tunnel testing according to claim 2, characterized in that: The automatic opening and closing device also includes a positioning and locking mechanism, which includes a positioning and locking servo motor one, a positioning and locking servo motor two, a positioning pin, and a positioning and locking slide rail. The positioning and locking slide rail is slidably provided with a positioning and locking slider through a dovetail groove. The positioning and locking slider is threadedly connected to a positioning and locking transmission screw. One end of the positioning and locking transmission screw is connected to the drive end of the positioning and locking servo motor one through a bevel gear transmission. The second positioning and locking servo motor is located on the positioning and locking slider, and the driving end of the second positioning and locking servo motor is provided with a positioning and locking threaded shaft; the positioning pin is sleeved on the end of the positioning and locking threaded shaft away from the second positioning and locking servo motor, and the positioning pin is threadedly connected to the positioning and locking threaded shaft.

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