CN115371939B - Section adjustable low-speed wind tunnel test section - Google Patents
Section adjustable low-speed wind tunnel test section Download PDFInfo
- Publication number
- CN115371939B CN115371939B CN202210948174.5A CN202210948174A CN115371939B CN 115371939 B CN115371939 B CN 115371939B CN 202210948174 A CN202210948174 A CN 202210948174A CN 115371939 B CN115371939 B CN 115371939B
- Authority
- CN
- China
- Prior art keywords
- groups
- test section
- equal
- wind tunnel
- side walls
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a section-adjustable low-speed wind tunnel test section, which comprises two groups of front equal-straight side walls, two groups of bent structures, two groups of rear equal-straight side wall auxiliary supports, two groups of rear equal-straight side walls, four groups of active push-pull assemblies and four groups of sliding assemblies, wherein when each group of front equal-straight side walls and rear equal-straight side walls are in a straight state, large test section side walls are formed and form large test section configurations with upper and lower wall surfaces of a wind tunnel; when the two groups of front equal-straight side walls are pushed by the four groups of active push-pull assemblies to move oppositely on the four groups of sliding assemblies, and simultaneously the two groups of rear equal-straight side walls rotate along with the inner side, the test section of which the flow channel is rectangular in shape when the large-size section state of the wind tunnel test section is changed into the test section of which the front section is rectangular in shape and the rear section is diffusion-shaped. The invention can realize the rapid switching of the test section size in the wind tunnel, greatly improve the wind tunnel operation and test efficiency and reduce the investment and operation cost.
Description
Technical Field
The invention belongs to the field of wind tunnels, and particularly relates to a wind tunnel test section with an adjustable section and a low speed.
Background
Wind tunnel tests are various, and due to different test purposes, a wind tunnel with a single size cannot complete all wind tunnel test tasks. The existing wind tunnel adopts a test section with fixed size and fixed section. In order to meet the test requirements of models of different types and sizes, a multi-test-section function is generally realized by adopting methods such as a serial test section or a replaceable test section group. Two or more test sections are connected in series in a wind tunnel runner in the serial test section, so that the use is convenient, but the defects of increased wind tunnel length, high construction cost, poor running economy of a large test section and the like exist; the replaceable test section group makes the contraction section, the test section and the diffusion section in the wind tunnel into an integral replaceable section, the test sections with different sizes correspond to different test section groups, the wind tunnel is good in operation economy, more equipment replacement is involved, particularly, the replacement efficiency is greatly reduced when the size of the wind tunnel is increased, the replacement speed of different test sections is low, and the positioning accuracy is low. The two multi-test-section layout methods have the defects of high construction cost, low operation efficiency and the like in different degrees, and influence the wind tunnel test efficiency and the product research and development period.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a low-speed wind tunnel test section with an adjustable section, which solves the problems of low replacement speed and low positioning precision of different test sections in a wind tunnel test; the size of the test section can be rapidly switched in the wind tunnel, and the operation and test efficiency of the wind tunnel are greatly improved.
The technical scheme adopted by the invention is as follows: a section-adjustable low-speed wind tunnel test section comprises two groups of front equal-straight side walls, two groups of bent structures, two groups of rear equal-straight side wall auxiliary supports, two groups of rear equal-straight side walls, four groups of active push-pull assemblies and four groups of sliding assemblies, wherein four upright supports are arranged in the wind tunnel test section and divided into two groups positioned on the front side and the rear side of the wind tunnel test section, each upright support is fixedly connected with one group of active push-pull assemblies, the ground of the wind tunnel test section corresponding to the four groups of active push-pull assemblies is fixedly connected with four groups of sliding assemblies, the four groups of sliding assemblies are mutually vertical to the axis of the wind tunnel test section, the side wall surfaces of the two groups of front equal-straight side walls are respectively and fixedly connected with the execution ends of the four groups of active push-pull assemblies, the tail end of each group of front equal-straight side walls is hinged with the front end of one group of rear equal-straight side walls through the bent structures, the lower plane of each group of front equal-straight side walls is connected with the two groups of sliding assemblies on the same side, the outer side walls of each group of rear equal-straight side walls are hinged with one group of rear equal-straight side walls auxiliary supports, and the lower ends of each group of rear equal-straight side walls are rotatably connected with the ground.
Further, when each group of front equal-straight side walls and rear equal-straight side walls are in a straight state, side walls of a large test section of the wind tunnel are formed, and a large test section configuration of the wind tunnel is formed by the side walls and the upper wall surface and the lower wall surface of the wind tunnel; when the two groups of front equal-straight side walls are pushed by the four groups of active push-pull assemblies to move oppositely on the four groups of sliding assemblies, and simultaneously the two groups of rear equal-straight side walls rotate along with the inner side, the rectangular shape of the flow channel is changed into the wind tunnel test section with the rectangular front section and the diffusion rear section when the wind tunnel test section is in a large-size section state.
Further, initiative push-and-pull subassembly include two screw rods, including a motor, a drive connecting rod, two sets of fixing bases, the reduction gear, two sets of fixing bases are fixed connection respectively in the upper and lower both ends that are close to the stand and support, two screw rods are parallel to each other, the lateral wall fixed connection of flange and anterior equal straight lateral wall is passed through to the one end of every screw rod, the other one end and the fixing base of every screw rod are connected, motor casing is fixed in on a set of fixing base, the output shaft and the retarder connection of motor, threaded connection has drive nut on every screw rod, two drive nut all are connected with the drive connecting rod, drive connecting rod and retarder connection, thereby the motor drives two drive nut of drive connecting rod drive anterior equal straight lateral wall and move on sliding assembly at the screw rod motion through the reduction gear.
Further, the slip subassembly include bottom sliding seat, shock pad, guide rail and guide rail seat, guide rail seat fixed connection subaerial in wind-tunnel test section to perpendicular with the axis of test section, guide rail seat and guide rail sliding connection, the guide rail can move on the guide rail seat, fixedly connected with bottom sliding seat on the guide rail installs the shock pad between guide rail and the bottom sliding seat, the lower plane and the bottom sliding seat fixed connection of anterior equal straight lateral wall.
The invention has the advantages that: the invention can realize the adjustment of the size of the wind tunnel test section in a short time, greatly improves the wind tunnel operation and test efficiency, and has the advantages of improving the actual test efficiency and reducing the investment and operation cost.
Drawings
FIG. 1 is a top view of the structure of the present invention;
FIG. 2 is a left side view of the structure of the present invention;
FIG. 3 is a side view of the structure of the present invention;
FIG. 4 is an enlarged view A of FIG. 2;
fig. 5 is an enlarged view B in fig. 3.
The test device comprises a base, a front part and a rear part, wherein the base comprises 1, a front part equal straight side wall, 2, a front part equal straight side wall after contraction, 3, a bent structure, 4, a variable side wall auxiliary support, 5, a rear part equal straight side wall, 6, a test section support upright post, 7, a driving push-pull assembly, 8, a driving connecting rod, 9, a follow-up push-pull assembly, 10, a lower fixing seat, 11, a screw rod, 12, a motor, 13, an upper fixing seat, 14, a speed reducer, 15, a bottom sliding seat, 16, a shock pad, 17, a guide rail, 18 and a guide rail seat.
Detailed Description
The technical scheme of the invention is further explained by the description of the embodiment.
Example 1
As shown in fig. 1-3, a section-adjustable low-speed wind tunnel test section comprises two groups of front equal-straight side walls 1, two groups of curved structures 3, two groups of rear equal-straight side wall auxiliary supports 4, two groups of rear equal-straight side walls 5, four groups of active push-pull assemblies 7 and four groups of sliding assemblies 10, wherein four upright supports 6 are arranged in the wind tunnel test section and are divided into two groups which are positioned at the front side and the rear side of the wind tunnel test section, each upright support 6 is fixedly connected with one group of active push-pull assemblies 7, the ground of the wind tunnel test section corresponding to the positions of the four groups of active push-pull assemblies 7 is fixedly connected with four groups of sliding assemblies 10, the four groups of sliding assemblies 10 are perpendicular to the axis of the wind tunnel test section, the lower planes of the front equal-straight side walls 1 are respectively and fixedly connected with the execution ends of the four groups of active push-pull assemblies 7, the tail end of each group of front equal-straight side walls 1 is hinged with the front end of one group of rear equal-straight side walls 5 through the curved structures 3, the outer side wall surface of each group of front equal-straight side walls 5 is hinged with the rear equal-straight side walls 4, and the lower ends of each group of rear equal-straight side walls 5 are connected with the ground of the rear equal-straight side walls 4; when each group of the front equal-straight side wall 1 and the rear equal-straight side wall 5 are in a straight state, a wind tunnel large test section side wall is formed, and a wind tunnel large test section configuration is formed by the wind tunnel large test section side wall and the upper wall surface and the lower wall surface of the wind tunnel; when the two groups of front equal-straight side walls 1 are pushed by the four groups of active push-pull assemblies 7 to move oppositely on the four groups of sliding assemblies 10, and meanwhile, the two groups of rear equal-straight side walls 2 rotate inwards in a follow-up manner, so that the front equal-straight side walls of the wind tunnel large test section are changed into the equal-straight side walls of the wind tunnel small test section; the wind tunnel test section with the front section in the rectangular shape and the rear section in the diffusion shape is changed from the wind tunnel test section with the rectangular shape of the flow channel in the large-size section state.
As shown in fig. 2-4, the active push-pull assembly 7 includes two screws 11, a motor 12, a driving connecting rod 8, two sets of fixing seats 13, and a speed reducer 14, where the two sets of fixing seats 13 are respectively and fixedly connected to the upper and lower ends of the upright support 6, the two screws 11 are parallel to each other, one end of each screw is fixedly connected to the outer sidewall of the front equal-straight sidewall 1 through a flange, the other end of each screw is connected to the fixing seat 13, a housing of the motor 12 is fixed to the set of fixing seats 13, an output shaft of the motor 12 is connected to the speed reducer 14, a driving nut is screwed onto each screw 11, both driving nuts are connected to the driving connecting rod 8, the driving connecting rod 8 is connected to the speed reducer 14, the motor 12 drives the driving connecting rod 8 to drive both driving nuts to move on the screws 11, and act on the outer sidewall of the front equal-straight sidewall 1 together through the speed reducer 14, so as to apply thrust in balance, thereby driving the front equal-straight sidewall 1 to move on the sliding assembly 10; through motor speed matching, the application of different thrusts is realized, the movement of the front equal straight side wall 1 is controlled, the driving nut can be self-locked, and the movement positioning and locking are realized.
As shown in fig. 5, the sliding assembly 10 includes a bottom sliding seat 15, a shock absorbing pad 16, a guide rail 17 and a guide rail seat 18, the guide rail seat 18 is fixedly connected to the ground of the wind tunnel test section and is perpendicular to the axis of the test section, the guide rail seat 18 is slidably connected to the guide rail 17, the guide rail 17 can move on the guide rail seat 18, the bottom sliding seat 15 is fixedly connected to the guide rail 17, the shock absorbing pad 16 is installed between the guide rail 17 and the bottom sliding seat 15, and the lower plane of the front equal straight side wall 1 is fixedly connected to the bottom sliding seat 15.
Example 2
The use process of the section-adjustable low-speed wind tunnel test section mainly comprises the following steps:
the method comprises the following steps: the front equal-straight side wall and the rear equal-straight side wall are in a straight state to form a large test section side wall, and a large test section configuration is formed by the large test section side wall and the upper wall surface and the lower wall surface of the wind tunnel test section;
step two: the two groups of front equal straight side walls are driven by a motor to move oppositely;
step three: two groups of rear equal-straight side walls form relative angle contraction and become equal-straight side walls of a small test section, the width of the test section is changed from large to small, and the test section and the upper wall surface and the lower wall surface of the wind tunnel test section form a small test section configuration, so that switching from the large test section to the small test section is realized;
step four: under the outward pulling of the active push-pull assembly, the front equal-straight side walls move outwards, the two groups of rear equal-straight side walls form relative angle expansion until the front equal-straight side walls and the rear equal-straight side walls reach a straight state, and the switching from a small test section to a large test section is realized.
Claims (3)
1. The utility model provides a wind-tunnel test section of adjustable low speed in cross-section, includes that two sets of straight lateral walls such as front portion, two sets of curved structure, two sets of straight lateral walls such as rear portion auxiliary stay, two sets of straight lateral walls such as rear portion, four groups initiative push-pull components and four groups sliding assembly, wind-tunnel test section in have four stands to support, divide into two sets of preceding, the rear portion both sides that are located wind-tunnel test section, its characterized in that: each upright post support is fixedly connected with a group of active push-pull assemblies, the ground of a wind tunnel test section corresponding to the positions of the four groups of active push-pull assemblies is fixedly connected with four groups of sliding assemblies, the four groups of sliding assemblies are mutually vertical to the axis of the wind tunnel test section, the side wall surfaces of two groups of front equal-straight side walls are respectively and fixedly connected with the execution ends of the four groups of active push-pull assemblies, the tail end of each group of front equal-straight side walls is hinged with the front end of a group of rear equal-straight side walls through a bending structure, the lower plane of each group of front equal-straight side walls is connected with the two groups of sliding assemblies on the same side, the outer side wall surface of each group of rear equal-straight side walls close to the middle position is hinged with a group of rear equal-straight side wall auxiliary supports, and the lower end of each group of rear equal-straight side wall auxiliary supports is rotatably connected with the ground of the wind tunnel; when each group of front equal-straight side walls and rear equal-straight side walls are in a straight state, forming side walls of a large test section of the wind tunnel, and forming a large test section configuration of the wind tunnel with the upper wall surface and the lower wall surface of the wind tunnel; when the two groups of front equal-straight side walls are pushed by the four groups of active push-pull assemblies to move oppositely on the four groups of sliding assemblies, and simultaneously the two groups of rear equal-straight side walls rotate along with the inner side, the rectangular shape of the flow channel is changed into the wind tunnel test section with the rectangular front section and the diffusion rear section when the wind tunnel test section is in a large-size section state.
2. The wind tunnel test section with the section adjustable in speed as claimed in claim 1, wherein: the initiative push-and-pull subassembly include two screw rods, including a motor, an end cap, a controller, and a cover plate, the drive connecting rod, two sets of fixing bases, the reduction gear, two sets of fixing bases difference fixed connection in the upper and lower both ends that are close to the stand and support, two screw rods are parallel to each other, the lateral wall fixed connection of flange and anterior equal straight lateral wall is passed through to the one end of every screw rod, the other one end and the fixing base of every screw rod are connected, motor casing is fixed in on a set of fixing base, the output shaft and the retarder connection of motor, threaded connection has drive nut on every screw rod, two drive nut all are connected with the drive connecting rod, drive connecting rod and retarder connection, thereby the motor drives two drive nut of drive connecting rod drive and moves on the screw rod motion drives anterior equal straight lateral wall and moves on sliding assembly through the reduction gear.
3. A section-adjustable low-speed wind tunnel test section according to claim 1 or 2, wherein: the sliding assembly comprises a bottom sliding seat, a shock pad, a guide rail and a guide rail seat, the guide rail seat is fixedly connected to the ground of the wind tunnel test section and is perpendicular to the axis of the test section, the guide rail seat is connected with the guide rail in a sliding mode, the guide rail can move on the guide rail seat, the bottom sliding seat is fixedly connected to the guide rail, the shock pad is installed between the guide rail and the bottom sliding seat, and the lower plane of the front equal-straight side wall is fixedly connected with the bottom sliding seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210948174.5A CN115371939B (en) | 2022-08-09 | 2022-08-09 | Section adjustable low-speed wind tunnel test section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210948174.5A CN115371939B (en) | 2022-08-09 | 2022-08-09 | Section adjustable low-speed wind tunnel test section |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115371939A CN115371939A (en) | 2022-11-22 |
| CN115371939B true CN115371939B (en) | 2023-03-28 |
Family
ID=84064678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210948174.5A Active CN115371939B (en) | 2022-08-09 | 2022-08-09 | Section adjustable low-speed wind tunnel test section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115371939B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117928881B (en) * | 2024-03-22 | 2024-05-28 | 中国空气动力研究与发展中心低速空气动力研究所 | Wind tunnel modularized shrink section system |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1198433A (en) * | 1957-01-15 | 1959-12-07 | Metallbau Semler G M B H | Aerodynamic wind tunnels |
| US3486699A (en) * | 1965-11-22 | 1969-12-30 | Snecma | Adjustable exhaust unit for turbojet propulsion engines |
| JPH09329524A (en) * | 1996-06-06 | 1997-12-22 | Masaru Matsumoto | Wind tunnel experimenting apparatus |
| CN103808486A (en) * | 2014-02-25 | 2014-05-21 | 中国计量学院 | Variable section test segment of air cooling heat radiator test system |
| CN206378267U (en) * | 2016-12-02 | 2017-08-04 | 中国航空工业集团公司沈阳空气动力研究所 | A kind of Mach number governor motion suitable for transonic and supersonic wind tunnel |
| CN108181080A (en) * | 2017-12-29 | 2018-06-19 | 中国航天空气动力技术研究院 | A kind of sub- position feedback and protective device across super wind-tunnel diffuser adjustment sheet |
| CN209230911U (en) * | 2019-01-29 | 2019-08-09 | 吉林大学 | A kind of adjustable wind-tunnel testing stand for the test of car model fluid structurecoupling |
| CN210464864U (en) * | 2019-11-07 | 2020-05-05 | 中国航空工业集团公司哈尔滨空气动力研究所 | Low-speed supercharging wind tunnel slip flow test model attack angle changing device |
| CN112504612A (en) * | 2020-12-29 | 2021-03-16 | 北京航天益森风洞工程技术有限公司 | Two-throat real-time adjustable super-expanding section |
| CN213239407U (en) * | 2020-09-24 | 2021-05-18 | 夏弗纳电磁兼容（上海）有限公司 | Wind tunnel device |
| CN113970418A (en) * | 2021-10-26 | 2022-01-25 | 中国航空工业集团公司哈尔滨空气动力研究所 | Variable attack angle device for wind tunnel test |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6470740B2 (en) * | 2000-12-28 | 2002-10-29 | Industrial Technology Research Institute | Low speed wind tunnel with adjustable moving boundary |
| US20220119256A1 (en) * | 2020-10-15 | 2022-04-21 | Cfd Research Corporation | Nitrous decomposition without catalyst |
-
2022
- 2022-08-09 CN CN202210948174.5A patent/CN115371939B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1198433A (en) * | 1957-01-15 | 1959-12-07 | Metallbau Semler G M B H | Aerodynamic wind tunnels |
| US3486699A (en) * | 1965-11-22 | 1969-12-30 | Snecma | Adjustable exhaust unit for turbojet propulsion engines |
| JPH09329524A (en) * | 1996-06-06 | 1997-12-22 | Masaru Matsumoto | Wind tunnel experimenting apparatus |
| CN103808486A (en) * | 2014-02-25 | 2014-05-21 | 中国计量学院 | Variable section test segment of air cooling heat radiator test system |
| CN206378267U (en) * | 2016-12-02 | 2017-08-04 | 中国航空工业集团公司沈阳空气动力研究所 | A kind of Mach number governor motion suitable for transonic and supersonic wind tunnel |
| CN108181080A (en) * | 2017-12-29 | 2018-06-19 | 中国航天空气动力技术研究院 | A kind of sub- position feedback and protective device across super wind-tunnel diffuser adjustment sheet |
| CN209230911U (en) * | 2019-01-29 | 2019-08-09 | 吉林大学 | A kind of adjustable wind-tunnel testing stand for the test of car model fluid structurecoupling |
| CN210464864U (en) * | 2019-11-07 | 2020-05-05 | 中国航空工业集团公司哈尔滨空气动力研究所 | Low-speed supercharging wind tunnel slip flow test model attack angle changing device |
| CN213239407U (en) * | 2020-09-24 | 2021-05-18 | 夏弗纳电磁兼容（上海）有限公司 | Wind tunnel device |
| CN112504612A (en) * | 2020-12-29 | 2021-03-16 | 北京航天益森风洞工程技术有限公司 | Two-throat real-time adjustable super-expanding section |
| CN113970418A (en) * | 2021-10-26 | 2022-01-25 | 中国航空工业集团公司哈尔滨空气动力研究所 | Variable attack angle device for wind tunnel test |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115371939A (en) | 2022-11-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115371939B (en) | Section adjustable low-speed wind tunnel test section | |
| CN113267315B (en) | Low-speed wind tunnel direct-drive gust generating device | |
| CN112880963B (en) | Double-machine supporting device for double-machine oiling wind tunnel test | |
| CN210426947U (en) | Temporary-flushing type high-speed wind tunnel low supersonic velocity flow field spray pipe device | |
| CN105784316A (en) | High-rigidness embedded device for multi-body separation test of hypersonic wind tunnel | |
| CN114993601A (en) | 2 m 4 wind tunnel groove wall test section | |
| CN112096085B (en) | Concrete pouring vibration device and using method thereof | |
| CN113820090A (en) | Pneumatic wind tunnel test section of long tunnel operation vehicle | |
| CN219124042U (en) | Servo motor capable of being positioned rapidly | |
| CN109556822B (en) | Method for reducing influence of boundary layer air flow of supporting surface and vehicle wind tunnel test platform | |
| CN205534961U (en) | Three -dimensional adjusting device | |
| CN208953233U (en) | A kind of wind tunnel test platform that supporting wheel diameter is variable | |
| CN113911390B (en) | Dynamic synchronous loading test device and method for deformed wing | |
| CN115077846A (en) | Large wind tunnel ground preparation platform | |
| CN112683484B (en) | Half-mode supporting mechanism applied to large continuous transonic wind tunnel | |
| CN209674599U (en) | A kind of bi-motor actively loads steering engine load simulator | |
| CN110610644A (en) | Overhead insulated cable swing simulation device and working method thereof | |
| CN221367515U (en) | Unmanned aerial vehicle's flight structure | |
| CN216902011U (en) | Small wind tunnel experimental device for demonstration | |
| CN112504621B (en) | Wedge device with continuously adjustable blocking ratio | |
| CN220542921U (en) | Rock high slope deformation machine device based on numerical simulation | |
| CN219202596U (en) | Solar simulator for urban planning | |
| CN218927746U (en) | Adjustable engine balance bracket | |
| CN220339631U (en) | Water surface wind simulator | |
| CN219117062U (en) | Automobile chassis dismounting supporting structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |