CN114910238A - Wind tunnel test device for flat roof eave form multi-working-condition change - Google Patents
Wind tunnel test device for flat roof eave form multi-working-condition change Download PDFInfo
- Publication number
- CN114910238A CN114910238A CN202210502162.XA CN202210502162A CN114910238A CN 114910238 A CN114910238 A CN 114910238A CN 202210502162 A CN202210502162 A CN 202210502162A CN 114910238 A CN114910238 A CN 114910238A
- Authority
- CN
- China
- Prior art keywords
- eave
- model
- wind tunnel
- building
- outer frame
- 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.)
- Granted
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
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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 wind tunnel test device for a flat roof eave form under multiple working conditions. Arranging a building model in a model outer frame, wherein a crack exists between the periphery of the building model and each inner wall surface in the model outer frame, and an eave test assembly is arranged in each crack; and a wind pressure measuring point is arranged at the top of the building model and is connected with a wind pressure acquisition device through a measuring point pipeline. The invention can realize the rapid conversion of the related test working conditions of the low building eave member in the building wind tunnel, can also rapidly realize the test of the influence of the dynamic change of the eave height on the roof wind pressure under the blowing condition, and is suitable for various eave members.
Description
Technical Field
The invention relates to a wind tunnel test device, in particular to a wind tunnel test device with a flat roof eave form and multiple working conditions changing.
Background
Wind disasters are the most common disasters in the natural world, and China is one of the few countries affected most seriously by typhoons in the world. Meanwhile, low houses are most widely distributed and common, and are also most seriously affected by wind disasters. The method has important significance in accurately and reasonably determining the wind load acting on the low-rise building, and the flat roof low-rise building is a type widely existing in the current low-rise buildings. Under the effect of wind load, the flat roof can generate columnar vortex in the direction perpendicular to the wall surface incoming flow, and can generate conical vortex in the direction 45 degrees to the wall surface incoming flow, so that strong negative wind pressure is generated on the head-on roof by the two vortexes, and the main reason for wind-induced damage of the low-rise building roof is realized. In the past, wind tunnel test researches find that columnar vortexes and conical vortexes can be broken by adopting special eave such as rectangular parapet walls, zigzag parapet walls and the like, so that negative wind pressure acting on a flat roof is reduced.
In the wind tunnel test, the influence of special eave forms such as rectangular parapet walls and zigzag parapet walls needs to be frequently considered, and the influence of different eave heights and different eave forms needs to be considered. For example, 10 models need to be manufactured when the wind pressure coefficients of roofs under parapet walls with 10 different heights are to be tested, the models need to be replaced 10 times in the wind tunnel, and meanwhile, the whole process is very complicated along with the 10-time wind tunnel test processes such as removal of a pressure measuring pipeline, installation of the pressure measuring pipeline and the like, and the preparation time for model change occupies most of the time of the total process of the wind tunnel test.
Therefore, the prior art lacks a wind tunnel test device with the multi-working-condition change of the flat roof eave form.
Disclosure of Invention
The invention aims to provide a wind tunnel test device for the eave form multi-working-condition change of a flat roof, which adopts the same test model and test system to realize the roof wind pressure test of the flat roof under the conditions of different eave forms and different eave heights, and simultaneously can realize the test of the influence of the dynamic eave height change on the roof wind pressure under the condition of blowing, thereby quickly realizing the wind pressure test of the flat roof under the conditions of different eave forms and heights.
The technical scheme adopted by the invention for solving the technical problems is as follows:
according to the invention, a building model is arranged in a model outer frame, a crack exists between the periphery of the building model and each inner wall surface in the model outer frame, an eave test component is arranged in each crack, during wind tunnel test, the model outer frame is fixed on a wind tunnel turntable of a building wind tunnel, the building model is arranged in the model outer frame, and one part of the eave test component is inserted into the crack between the building model and the model outer frame; at least one wind pressure measuring point is arranged at the top of the building model and is connected with a wind pressure acquisition device through a measuring point pipeline.
Each eave test assembly comprises a carrying platform, a stepping motor, a lifting platform and an eave member; a carrying platform is arranged on the lower side of each inner wall face of the outer model frame, a stepping motor is mounted on the carrying platform, an output shaft of the stepping motor is horizontally arranged and is coaxially connected with a gear, the gear is meshed with a rack, the rack is vertically arranged and movably mounted in the carrying platform in a lifting mode, a lifting platform is fixedly mounted at the top end of the rack, an eave component is arranged on the lifting platform, and the eave component is inserted into a crack between the inner wall faces of the outer model frame and the building model.
Magnet is installed at the top of the lifting platform, magnet is also arranged at the bottom of the eave component, and the lifting platform and the eave component are connected in an installing mode through magnetic adsorption of the magnet.
The eave component adopts a flat parapet or a sawtooth parapet and the like.
The step motor is electrically connected with the control device, and the control device controls the step motor to operate so as to remotely control the lifting platform to move up and down, so that the eave component is driven to move up and down in the crack.
The vertical distance between the wind pressure measuring point at the top of the building model and the wind tunnel turntable exceeds the thickness of the viscous layer of the wind tunnel, namely the height of the building model is larger than 15 cm.
The stepping motors in the eave test assemblies work synchronously or asynchronously.
The eave component used under different test working conditions is modularized, so that the component can be matched with a test device, and quick plug-in replacement is realized.
The invention has the beneficial effects that:
the invention can realize the rapid conversion of the related test working conditions of the low and medium building eave member in the building wind tunnel, and can also realize the test of the influence of the dynamic change of the eave height on the roof wind pressure under the blowing condition.
The invention adopts the same test model and test system to realize the test of the wind pressure of the flat roof under the conditions of different eave forms and different eave heights, and simultaneously can realize the test of the influence of the dynamic change of the eave height on the wind pressure of the roof under the condition of blowing, thereby quickly realizing the test of the wind pressure of the flat roof under the conditions of different eave forms and heights.
The invention is suitable for various eave components, such as a flat parapet, a sawtooth parapet, a wave parapet and the like.
Drawings
FIG. 1 is a schematic view of the wind tunnel position of the apparatus of the present invention.
FIG. 2 is a schematic view of the overall apparatus of the present invention.
Fig. 3 is a three-dimensional view of a building model.
FIG. 3(a) is a front view of a construction model;
FIG. 3(b) is a top view of the architectural model;
FIG. 3(c) is a side view of the construction model;
fig. 4 is a schematic view of the elevation of the eave member.
Fig. 5 is a top view of the model outer frame.
Fig. 6 is a cross-sectional view of the model outer frame taken along section a-a.
Fig. 7 is a perspective view of the core portion of the device in operation.
FIG. 8 is a partially schematic illustration of an example of an operating condition achievable by the apparatus.
In the figure: 1. the building wind tunnel comprises a model outer frame, 2, a carrying platform, 3, a stepping motor, 4, a lifting platform, 5, a rack, 6, a magnet, 7, an eave component, 8, a building model, 9, a wind pressure measuring point, 10, a measuring point pipeline, 11, a wind tunnel turntable, 12, a wind pressure acquisition device, 13, a building wind tunnel, 14 and a stepping motor control device.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1 and 2, the upper end of the model outer frame 1 is open, a building model 8 as a test object is arranged in the model outer frame 1, a crack exists between the periphery of the building model 8 and each inner wall surface in the model outer frame 1, an eave test component is arranged in each crack, during wind tunnel test, the model outer frame 1 is fixed on a wind tunnel turntable 11 of a building wind tunnel 13, wind power is parallel to a rotating plane of the wind tunnel turntable 11, the building model 8 is arranged in the model outer frame 1, and a part of the eave test component is inserted into the crack between the building model 8 and the model outer frame 1; at least one wind pressure measuring point 9 is arranged at the top of the building model 8, the wind pressure measuring point 9 is connected with a wind pressure acquisition device 12 at the bottom of a wind tunnel turntable 11 through a measuring point pipeline 10, and the wind pressure acquisition device 12 can be arranged in the middle of the bottom of the model outer frame 1.
As shown in fig. 4, 5 and 7, each eave test assembly comprises a carrying platform 2, a stepping motor 3, a lifting platform 4 and an eave member 7; a carrying platform 2 is arranged at the lower side of each inner wall face of the outer frame 1 of the model, a stepping motor 3 is installed on the carrying platform 2, the output shaft of the stepping motor 3 is horizontally arranged and is coaxially connected with a gear below the lifting platform 4, the gear is meshed with a rack 5 to be connected, the rack 5 is vertically arranged and movably installed in the carrying platform 2 in a lifting mode, the lifting platform 4 is fixedly installed at the top end of the rack 5, in specific implementation, the carrying platform 2 is provided with a vertical hole close to the inner wall of the outer frame 1 of the model, and the vertical hole is reserved as a space for the rack 5 to move up and down. An eave member 7 is arranged on the lifting platform 4, and the eave member 7 is driven by the lifting platform 4 to move up and down; the eave component 7 is inserted into a gap between the building model 8 and the inner wall surface of the model outer frame 1.
In the embodiment, as shown in fig. 6, a hole and a groove are formed in the middle-lower portion of each inner wall surface of the model outer frame 1 as a reserved position for the stepping motor 3 and the carrying platform 2.
The eave component 7 is a flat parapet or a sawtooth parapet and the like, and the size is the same as that of the lifting platform 4.
The stepping motor 3 is electrically connected with the control device 14, the control device 14 controls the stepping motor 3 to operate so as to remotely control the lifting platform 4 to move up and down, the eave component 7 is driven to move up and down in the crack, and the eave component can extend out of the model outer frame 1 from the crack. Driving the eave member 7 to move up and down, thereby realizing the conversion of working conditions.
In a specific implementation, the model outer frame 1 is a rectangular frame, and the building model 8 is shown in fig. 3. And eave test assemblies are uniformly distributed in a gap between the periphery of the building model 8 and each inner wall surface of the four side surfaces of the model outer frame 1, and the stepping motors 3 of the four eave test assemblies of the model outer frame 1 work synchronously or asynchronously.
The eave component 7 is driven to move up and down in the crack, the model outer frame 1 is driven to rotate through rotation of the wind tunnel rotary table 11, then a wind pressure test is carried out in the building wind tunnel 13, wind pressure of each wind pressure measuring point 9 is monitored in real time, and then influences of the heights of different eave components 7 on roof wind loads of building models 8 in the model outer frame 1 are obtained through measurement.
And the eave members 7 with different types and sizes are replaced to carry out a plurality of tests, so that the influence of the eave members 7 with different types and sizes on the roof wind load of the building model 8 in the model outer frame 1 can be obtained.
Such as the height variation of parapet wall, see (a), (b), (c) of fig. 8; if the forms of the parapet wall are different, see (c), (d) and (e) of fig. 8; if the parapet wall height gradually changes during the blowing process, see (f) of fig. 8; such as parapet wall, see (e), (g), and (h) of fig. 8.
Example (b):
the method of using the device will now be described by taking a certain wind tunnel test device and test process as examples.
As shown in fig. 1 to 8, the test procedure is as follows:
1) a model outer frame 1 is firstly placed on a wind tunnel turntable 7 with the diameter of 3.5m of a certain ZD-1 building wind tunnel 6, and the peripheral dimension is 64cm multiplied by 43cm multiplied by 42 cm. The model outer frame 1 is composed of a sleeve, a stepping motor 3, a lifting platform 4 and a carrying platform 2.
2) The building model 8 with the station tube is inserted into the sleeve, the model 5 dimensions 63cm x 42 cm. 353 measuring points are arranged at the top of the model 8, and the height of the measuring points exceeds the thickness of the viscous layer of the wind tunnel.
3) And (3) respectively placing the parapet 7 plates into the cracks of the model outer frame 1 and the building model 8, and magnetically connecting the parapet 7 plates with the lifting platform 4.
4) Through controlling step motor 3, adjust parapet 7 and expose the height of architectural model 8, the high operating mode of different parapet is simulated, obtains the wind pressure coefficient of roofing under the different operating modes.
The above-described embodiments are intended to illustrate rather than to limit the invention, and all changes and modifications that come within the spirit of the invention and the scope of the appended claims are intended to be embraced therein.
Claims (7)
1. The utility model provides a wind tunnel test device that many operating modes of flat roofing eave form change which characterized in that: arranging a building model (8) in a model outer frame (1), wherein a crack exists between the periphery of the building model (8) and each inner wall surface in the model outer frame (1), an eave test component is arranged in each crack, the model outer frame (1) is fixed on a wind tunnel turntable (11) of a building wind tunnel (13) during wind tunnel test, the building model (8) is arranged in the model outer frame (1), and one part of the eave test component is inserted into the crack between the building model (8) and the model outer frame (1); at least one wind pressure measuring point (9) is arranged at the top of the building model (8), and the wind pressure measuring point (9) is connected with a wind pressure acquisition device (12) through a measuring point pipeline (10).
2. The wind tunnel test device for the multi-working-condition change of the flat roof eaves form according to claim 1, characterized in that: each eave test assembly comprises a carrying platform (2), a stepping motor (3), a lifting platform (4) and an eave member (7); a carrying platform (2) is arranged on the lower side of each inner wall face of the outer model frame (1), a stepping motor (3) is installed on the carrying platform (2), the output shaft of the stepping motor (3) is horizontally arranged and is coaxially connected with a gear, the gear is meshed with a rack (5) to be connected, the rack (5) is vertically arranged and movably installed in the carrying platform (2) in a lifting mode, a lifting platform (4) is fixedly installed on the top end of the rack (5), an eave component (7) is arranged on the lifting platform (4), and the eave component (7) is inserted into a gap between the inner wall faces of the outer model frame (1) and a building model (8).
3. The wind tunnel test device for the multi-working-condition change of the flat roof eaves form according to claim 1, characterized in that: magnet (6) are installed at lift platform (4) top, magnet (6) are also arranged to eave component (7) bottom, realize erection joint through magnet (6) looks magnetic adsorption between lift platform (4) and eave component (7).
4. The wind tunnel test device for the multi-working-condition change of the flat roof eaves form according to claim 1, characterized in that: the eave component (7) adopts a flat parapet or a sawtooth parapet and the like.
5. The wind tunnel test device for the multi-working-condition change of the flat roof eaves form according to claim 1, characterized in that: the step motor (3) is electrically connected with the control device (14), the control device (14) controls the step motor (3) to operate so as to remotely control the lifting platform (4) to move up and down, and the eave component (7) is driven to move up and down in the crack.
6. The wind tunnel test device for the multi-working-condition change of the flat roof eaves form according to claim 1, characterized in that: the vertical distance between a wind pressure measuring point (9) at the top of the building model (8) and the wind tunnel turntable (11) exceeds the thickness of a viscous layer of the wind tunnel.
7. The wind tunnel test device for the multi-working-condition change of the flat roof eaves form according to claim 1, characterized in that: the stepping motors (3) in the eave test assemblies work synchronously or asynchronously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210502162.XA CN114910238B (en) | 2022-05-09 | 2022-05-09 | Wind tunnel test device for multi-working condition change of flat roof eave form |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210502162.XA CN114910238B (en) | 2022-05-09 | 2022-05-09 | Wind tunnel test device for multi-working condition change of flat roof eave form |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114910238A true CN114910238A (en) | 2022-08-16 |
| CN114910238B CN114910238B (en) | 2023-04-25 |
Family
ID=82766082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210502162.XA Active CN114910238B (en) | 2022-05-09 | 2022-05-09 | Wind tunnel test device for multi-working condition change of flat roof eave form |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114910238B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117969008A (en) * | 2024-03-29 | 2024-05-03 | 中铁建设集团有限公司 | Wind tunnel test method and model for pushing construction of large-span roof crossing existing line |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200985562Y (en) * | 2006-10-18 | 2007-12-05 | 刘杰 | Moveable nested up-down two layers house |
| CN201817912U (en) * | 2010-08-10 | 2011-05-04 | 邓世超 | Combined house adjustable in height |
| CN205333290U (en) * | 2016-01-27 | 2016-06-22 | 中南大学 | Gas bullet model |
| CN107576473A (en) * | 2017-10-10 | 2018-01-12 | 重庆交通大学 | A kind of full size low rise buildings wind load simulation system suitable for field |
| CN207215379U (en) * | 2017-08-22 | 2018-04-10 | 河北宏星检测技术服务有限责任公司 | A kind of curtain wall physical three-property detection device |
| CN108374492A (en) * | 2018-01-08 | 2018-08-07 | 新疆天地集团有限公司 | Automatic glass room and installing type building |
| CN110306738A (en) * | 2019-07-11 | 2019-10-08 | 重庆锦森腾建筑工程咨询有限公司 | A kind of wind load actual measurement room of variable parapet |
| JP2019178870A (en) * | 2018-03-30 | 2019-10-17 | 前田建設工業株式会社 | Model molding device for wind tunnel experiment |
| CN110487504A (en) * | 2019-07-24 | 2019-11-22 | 浙江大学 | Consider the shelter bridge wind load air tunnel testing device of bridge floor and water surface distance |
| CN210375611U (en) * | 2019-09-26 | 2020-04-21 | 西安锐达航空科技有限公司 | Wind tunnel model fixing frame |
| CN210774602U (en) * | 2019-11-15 | 2020-06-16 | 苏州浪潮智能科技有限公司 | Tool convenient to wind-tunnel test |
| CN111929028A (en) * | 2020-09-25 | 2020-11-13 | 海南大学 | On-site actual measurement system and method for measuring wind-blown sand flow field and wind-blown sand load of building |
| CN215910089U (en) * | 2021-09-07 | 2022-02-25 | 昆山众思自动化科技有限公司 | Wind tunnel test auxiliary device with height adjusting function |
-
2022
- 2022-05-09 CN CN202210502162.XA patent/CN114910238B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200985562Y (en) * | 2006-10-18 | 2007-12-05 | 刘杰 | Moveable nested up-down two layers house |
| CN201817912U (en) * | 2010-08-10 | 2011-05-04 | 邓世超 | Combined house adjustable in height |
| CN205333290U (en) * | 2016-01-27 | 2016-06-22 | 中南大学 | Gas bullet model |
| CN207215379U (en) * | 2017-08-22 | 2018-04-10 | 河北宏星检测技术服务有限责任公司 | A kind of curtain wall physical three-property detection device |
| CN107576473A (en) * | 2017-10-10 | 2018-01-12 | 重庆交通大学 | A kind of full size low rise buildings wind load simulation system suitable for field |
| CN108374492A (en) * | 2018-01-08 | 2018-08-07 | 新疆天地集团有限公司 | Automatic glass room and installing type building |
| JP2019178870A (en) * | 2018-03-30 | 2019-10-17 | 前田建設工業株式会社 | Model molding device for wind tunnel experiment |
| CN110306738A (en) * | 2019-07-11 | 2019-10-08 | 重庆锦森腾建筑工程咨询有限公司 | A kind of wind load actual measurement room of variable parapet |
| CN110487504A (en) * | 2019-07-24 | 2019-11-22 | 浙江大学 | Consider the shelter bridge wind load air tunnel testing device of bridge floor and water surface distance |
| CN210375611U (en) * | 2019-09-26 | 2020-04-21 | 西安锐达航空科技有限公司 | Wind tunnel model fixing frame |
| CN210774602U (en) * | 2019-11-15 | 2020-06-16 | 苏州浪潮智能科技有限公司 | Tool convenient to wind-tunnel test |
| CN111929028A (en) * | 2020-09-25 | 2020-11-13 | 海南大学 | On-site actual measurement system and method for measuring wind-blown sand flow field and wind-blown sand load of building |
| CN215910089U (en) * | 2021-09-07 | 2022-02-25 | 昆山众思自动化科技有限公司 | Wind tunnel test auxiliary device with height adjusting function |
Non-Patent Citations (2)
| Title |
|---|
| 李寿科等: "女儿墙对平屋面低矮建筑风荷载特性的影响", 《建筑结构》 * |
| 聂少锋等: "平面L形低矮房屋平均风压分布特性数值模拟", 《结构工程师》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117969008A (en) * | 2024-03-29 | 2024-05-03 | 中铁建设集团有限公司 | Wind tunnel test method and model for pushing construction of large-span roof crossing existing line |
| CN117969008B (en) * | 2024-03-29 | 2024-06-11 | 中铁建设集团有限公司 | Wind tunnel test method and model for pushing construction of large-span roof crossing existing line |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114910238B (en) | 2023-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101598628B (en) | Thunderstorm downburst multifunction experiment simulator | |
| CN114910238A (en) | Wind tunnel test device for flat roof eave form multi-working-condition change | |
| CN105486464A (en) | Substation roof plate rain leakage on-line monitoring system and monitoring method | |
| CN219473334U (en) | Building energy-saving detection equipment | |
| CN211666188U (en) | Wall whitewashes device for building interior decoration | |
| CN114323550B (en) | Driving type wind tunnel test system for simulating actual vibration form of structure | |
| CN218211864U (en) | Testing device for wind resistance field evaluation of metal roof system | |
| CN110823705A (en) | Indoor pressurization test device and method for bidirectional pressurization large-size concrete test block | |
| CN215339646U (en) | Quality detection device for high-rise building | |
| CN113654919B (en) | Self-balancing testing device and testing method for single-cabin pipe gallery joint shearing resistance | |
| CN201464152U (en) | Thunderstorm downburst multifunction test simulation device | |
| CN115156871A (en) | Electrical engineering and automatic dedicated location installation device thereof | |
| CN212271639U (en) | Simple mechanical PC board mounting mechanism | |
| CN113270021A (en) | Transformer substation maintenance operation and accident drilling device and drilling method | |
| CN113340531A (en) | Distribution box sealing performance test device and test method | |
| CN213580132U (en) | Effective smoke exhaust area test platform of natural smoke exhaust facility | |
| CN211527758U (en) | Be used for 1000kV to be qualified for next round of competitions framework anti-seismic testing structure | |
| CN219996925U (en) | Multifunctional steel structure anticorrosion quality inspection robot | |
| CN220139478U (en) | Auxiliary maintenance device for photovoltaic module | |
| CN217702075U (en) | Be applied to four-station platform conversion equipment of lead acid battery casting welding | |
| CN216050020U (en) | Building site environment detection device | |
| CN219115269U (en) | High-reliability auxiliary device for new energy intelligent charging pile system | |
| CN111927720B (en) | Adsorption moving device for ultrasonic nondestructive testing of tower body array of wind driven generator | |
| CN213580133U (en) | Smoke generating device for testing effective smoke exhaust area of natural smoke exhaust facility | |
| CN218029722U (en) | Opening device for multi-leaf electric window |
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 |