CN114441132A - Side wall plate pulling device for large wind tunnel jet pipe section and pulling method thereof - Google Patents
Side wall plate pulling device for large wind tunnel jet pipe section and pulling method thereof Download PDFInfo
- Publication number
- CN114441132A CN114441132A CN202210362564.4A CN202210362564A CN114441132A CN 114441132 A CN114441132 A CN 114441132A CN 202210362564 A CN202210362564 A CN 202210362564A CN 114441132 A CN114441132 A CN 114441132A
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- side wall
- wall plate
- pin shaft
- wind tunnel
- connecting rod
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- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the field of wind tunnel equipment, and discloses a side wall plate pulling device for a large wind tunnel jet pipe section and a pulling method thereof, wherein the side wall plate pulling device comprises a main frame, a plurality of connecting rods and triangular support connecting rods, wherein the main frame is a wind tunnel frame and is fixed on the ground or in a tunnel body; one end of the connecting rod is connected with the main frame through a pin shaft II, and the other end of the connecting rod is rotatably connected with a side wall plate of the wind tunnel through a pin shaft I; the triangular support connecting rod is provided with a vertical connecting edge and a transverse convex edge, wherein the connecting edge is connected with the main frame through a pin shaft III and a pin shaft IV, and the convex edge is rotatably connected with the side wall plate through a pin shaft V; the side wall plate pulling method is realized through the pulling device, the fixing and pulling of the side wall plate are realized by adopting a plurality of groups of parallelogram link mechanisms, and the side wall plate is pulled quickly and conveniently without a driving mechanism and a control system under the action of the gravity of the side wall plate, so that the motion rule is simple.
Description
Technical Field
The invention belongs to the technical field of wind tunnel equipment, relates to a side wall pulling structure of wind tunnel equipment, and particularly relates to a side wall plate pulling device for a large wind tunnel and a pulling method thereof.
Background
The large wind tunnel equipment wall plate often needs to adjust the angle or the shape to adapt to the flow field requirement, and the side wall needs to be pulled open for realizing the maintenance of the wall plate. In the prior art, a large wind tunnel plane side wall is pulled open by arranging a guide rail sliding block or a walking wheel at the bottom of the side wall, and when the side wall needs to be pulled open, the side wall is pulled open by a hydraulic or electric actuating mechanism.
However, for the large-scale wind tunnel side wall plate, the size is often larger, the length direction of the large-scale wind tunnel side wall plate even reaches tens of meters, the traditional side wall pulling mechanism needs to be arranged in a large number, and the construction cost is greatly increased. Meanwhile, the requirement on control synchronization is high, and once the movement is asynchronous, the guide structure is blocked. And a plurality of specialties such as structure, control, detection are related to, the system is complicated, the equipment construction cost and the maintenance difficulty are increased, and the experiment efficiency is reduced.
Disclosure of Invention
Therefore, aiming at the problems of complex side wall plate pulling structure system, high requirements on processing and assembly, high construction cost and the like in the prior art, the side wall plate pulling device for the large wind tunnel is provided, and concretely comprises
The main frame is a wind tunnel frame and is fixed on the ground or inside the tunnel body;
one end of each connecting rod is connected with the main frame through a pin shaft II, and the other end of each connecting rod is rotatably connected with a side wall plate of the wind tunnel through a pin shaft I; and
the triangular support connecting rod is provided with a vertical connecting edge and a transverse convex edge, wherein the connecting edge is connected with the main frame through a pin shaft III and a pin shaft IV, and the convex edge is rotatably connected with the side wall plate through a pin shaft V.
Furthermore, set up the several on the lateral wall board and be used for installing the hinge ear seat of connecting rod or triangular supports connecting rod, the main frame is provided with the hinge ear seat that is used for connecting the connecting rod and is used for connecting the double hinge ear seat of triangular supports connecting rod. Preferably, the side wall plate comprises a wall plate, a reinforcing rib plate, hinge lug seats and the like, one side of the wall plate is an airflow channel, the other side of the wall plate is provided with a plurality of hinge lug seats for mounting a sliding bearing I and a pin shaft I, and then the wall plate is fixed on the main frame through a plurality of connecting rods and triangular support connecting rods.
Furthermore, the pin shaft I and the pin shaft II are respectively arranged on the hinge lug seat through a sliding bearing I and a sliding bearing II.
Furthermore, a restraint device convenient for an operator to disassemble the pin shaft III is arranged at the upper end or the lower end of the side wall plate.
Furthermore, restraint device is jack or hand block or electric block, through restraint device can make things convenient for the staff to dismantle the round pin axle when pulling open the lateral wall board, also makes things convenient for the installation of staff at the equipment part round pin axle.
Further, the number of the connecting rods is N, wherein N is more than 1 and less than 100; the arrangement aims at improving the stability of the whole device and ensuring that the side wall plates can be smoothly opened and closed; on the basis of guaranteeing the function of pulling apart the side wall board, also reduce manufacturing cost and installation degree of difficulty.
The side wall plates of the wind tunnel can be pulled open through the side wall plate pulling device, the fixing and pulling of the side wall plates are realized through a plurality of groups of parallelogram link mechanisms, and a driving mechanism and a control system are not needed under the action of gravity of the side wall plates, so that the complexity of the system is greatly reduced, and the construction cost is reduced; meanwhile, the wallboard is connected with the frame through the connecting rod, when the side wall is required to be pulled open, the pin shaft is pulled off, the side wall is put down to be pulled open, and the system is simpler, safer and more reliable.
Meanwhile, the invention also provides a side wall plate pulling method based on the side wall plate pulling device, which comprises the following steps:
arranging a jack at the bottom of the side wall plate or installing a handle hoist at the top of the side wall plate to constrain the side wall plate along the vertical direction;
pulling out the pin shaft in the triangular support connecting rod, then releasing the jack or the handle block, and putting down the side wall plate along the gravity direction;
because the connecting rod and the triangular support connecting rod rotate around the pin shaft on the main frame, the side wall plate can move horizontally while descending, and the pulling-open is completed.
The method realizes the fixation and the pulling-open of the side wall plates through a plurality of groups of parallelogram link mechanisms, does not need a driving mechanism and a control system under the action of the gravity of the side wall plates, ensures that the side wall plates are pulled open quickly and conveniently, can realize the pulling-open distance with larger stroke by the pulling-open mode, and has simple motion law.
Drawings
FIG. 1 is a schematic view of the working state of a side wall plate pulling device for a large wind tunnel nozzle segment according to the present invention;
FIG. 2 is a schematic drawing showing the side wall plate pulling device for a large wind tunnel nozzle segment according to the present invention in a pulled-out state;
FIG. 3 is a partial enlarged view of a side wall plate pulling device for a large wind tunnel nozzle segment according to the present invention;
FIG. 4 is a schematic view of the triangular support link of the present invention;
in the figure: 1. a side wall panel; 2. a pin shaft I; 3. a connecting rod; 4. a pin shaft II; 5. a main frame; 6. a pin shaft III; 7. a triangular support connecting rod; 71. a connecting edge; 72. a convex edge; 8. a pin shaft IV; 9. a pin shaft V; 10. a sliding bearing I; 11. and a sliding bearing II.
Detailed Description
The present invention will be described in detail below with reference to the attached drawings, and the technical solutions in the embodiments of the present invention will be clearly and completely described. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in figures 1, 2, 3 and 4, the invention provides a side wall plate pulling device for a large wind tunnel nozzle section, which comprises
The main frame 5 is a wind tunnel frame and is fixed on the ground or inside a hole body;
one end of each connecting rod 3 is connected with the main frame 5 through a pin shaft II 4, and the other end of each connecting rod 3 is rotatably connected with the side wall plate 1 of the wind tunnel through a pin shaft I2; and
the triangular support connecting rod 7 is provided with a vertical connecting edge 71 and a transverse convex edge 72 (shown in figure 4), wherein the connecting edge 71 is connected with the main frame 5 through a pin shaft III 6 and a pin shaft IV 8, and the convex edge 72 is rotatably connected with the side wall plate 1 through a pin shaft V9.
In this embodiment, a plurality of hinge ear seats for mounting the connecting rod or the triangular support connecting rod are disposed on the side wall plate 1, and a hinge ear seat for connecting the connecting rod and a double-seat hinge ear seat for connecting the triangular support connecting rod are disposed on one side of the main frame 5 close to the side wall plate.
In this embodiment, as shown in fig. 3, the pin I2 and the pin ii 4 are mounted on the hinge ear via a sliding bearing I10 and a sliding bearing ii 11, respectively.
In this embodiment, a restraining device for facilitating the removal of the pin shaft iii 6 by an operator is provided at the upper end or the lower end of the side wall plate 1.
In this embodiment, the restraining device is a jack or a hand or electric hoist.
In this embodiment, the number of said connecting rods 3 is N, wherein 1 < N < 100.
In the implementation, the side wall plate 1 and the main frame 5 are made of 304 stainless steel materials, the side wall plate 1 comprises a wall plate, a wall plate frame and a plurality of hinge seats connected with the wall plate frame, and pin shafts are arranged in the hinge seats;
the pin shaft I, the connecting rod, the pin shaft II, the pin shaft III, the triangular support connecting rod, the pin shaft IV and the pin shaft V are made of S03 stainless steel; the sliding bearing I and the sliding bearing II are made of aluminum bronze.
All the pin shafts are installed in place in the working state, and when the side wall plates need to be pulled open, the side wall plates are restrained in the vertical direction in a mode that jacks are arranged at the bottoms of the side wall plates or a pull block is arranged at the top of the side wall plates. And pulling out the pin shaft in the triangular support connecting rod, then releasing the jack or the chain block, and putting down the side wall plate along the gravity direction. Because the connecting rod and the triangular support connecting rod rotate around the pin shaft on the main frame, the side wall plate can be pulled open in the horizontal direction while descending.
Meanwhile, the side wall plate pulling device provided by the embodiment can realize the pulling amount of the connecting rod with the length being more than 50% by reasonably selecting the length and the space size of the connecting rod, meet the maintenance requirement of the sealing strip and achieve the technical index of a certain large wind tunnel.
Example two:
a side wall panel pulling method using the side wall panel pulling apparatus according to the first embodiment, comprising the steps of:
arranging a jack at the bottom of the side wall plate 1 or installing a handle block at the top of the side wall plate 1 to constrain the side wall plate 1 along the vertical direction;
pulling out the pin shaft III 6 in the triangular support connecting rod 7, then releasing the jack or the handle block, and putting down the side wall plate 1 along the gravity direction;
since the connecting rod 3 and the triangular support connecting rod 7 both rotate around the pin shaft on the main frame 5 (as shown in fig. 2), the side wall plate 1 is moved horizontally while descending, and the pulling-open is completed.
The method is based on the side wall plate pulling method of the side wall plate pulling device, the fixing and pulling of the side wall plates are realized through a plurality of groups of parallelogram link mechanisms, the side wall plates are pulled quickly and conveniently under the action of gravity of the side wall plates without a driving mechanism and a control system, the pulling mode can realize the pulling distance of a larger stroke, and the motion rule is simple.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The utility model provides a side wall board pulling device for large-scale wind-tunnel spout section which characterized in that: comprises that
The main frame (5) is a wind tunnel frame and is fixed on the ground or inside the hole body;
one end of each connecting rod (3) is connected with the main frame (5) through a pin shaft II (4), and the other end of each connecting rod (3) is rotatably connected with the side wall plate (1) of the wind tunnel through a pin shaft I (2); and
the triangular support connecting rod (7) is provided with a vertical connecting edge (71) and a transverse convex edge (72), wherein the connecting edge (71) is connected with the main frame (5) through a pin shaft III (6) and a pin shaft IV (8), and the convex edge (72) is rotatably connected with the side wall plate (1) through a pin shaft V (9).
2. The side wall plate pulling device for the large wind tunnel nozzle segment according to claim 1, characterized in that: the hinge device is characterized in that a plurality of hinge lug seats used for installing connecting rods or triangular support connecting rods are arranged on the side wall plate (1), and the main frame (5) is provided with the hinge lug seats used for connecting the connecting rods (3) and double-seat hinge lug seats used for connecting the triangular support connecting rods (7).
3. The side wall plate pulling device for the large wind tunnel nozzle section according to claim 2, characterized in that: and the pin shaft I (2) and the pin shaft II (4) are respectively arranged on the hinge lug seat through a sliding bearing I (10) and a sliding bearing II (11).
4. The side wall plate pulling device for the large wind tunnel nozzle section according to claim 1, characterized in that: and a restraint device convenient for an operator to disassemble the pin shaft III (6) is arranged at the upper end or the lower end of the side wall plate (1).
5. The side wall plate pulling device for the large wind tunnel nozzle section according to claim 4, wherein: the restraint device is a jack or a manual hoist or an electric hoist.
6. The side wall plate pulling device for the large wind tunnel nozzle section according to claim 1, characterized in that: the number of the connecting rods (3) is N, wherein N is more than 1 and less than 100.
7. A method for pulling apart a side wall plate of a side wall plate pulling device for a large wind tunnel nozzle section according to any one of claims 1 to 6, comprising the steps of:
arranging a jack at the bottom of the side wall plate (1) or installing a pull-handle hoist at the top of the side wall plate to constrain the side wall plate (1) along the vertical direction;
pulling out a pin shaft III (6) in the triangular support connecting rod (7), then releasing the jack or the chain block, and putting down the side wall plate (1) along the gravity direction;
because the connecting rod (3) and the triangular support connecting rod (7) rotate around the pin shaft on the main frame (5), the side wall plate (1) can move horizontally while descending, and the pulling-open is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210362564.4A CN114441132B (en) | 2022-04-08 | 2022-04-08 | Side wall plate pulling device for large wind tunnel jet pipe section and pulling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210362564.4A CN114441132B (en) | 2022-04-08 | 2022-04-08 | Side wall plate pulling device for large wind tunnel jet pipe section and pulling method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114441132A true CN114441132A (en) | 2022-05-06 |
| CN114441132B CN114441132B (en) | 2022-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210362564.4A Active CN114441132B (en) | 2022-04-08 | 2022-04-08 | Side wall plate pulling device for large wind tunnel jet pipe section and pulling method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117232771A (en) * | 2023-11-10 | 2023-12-15 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Device and method for adjusting outlet angle of flexible wall jet pipe of large wind tunnel |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2676815A1 (en) * | 1991-05-24 | 1992-11-27 | Serv Souffleries In Et Const | IMPROVEMENT FOR AERODYNAMIC BLOWERS WITH A DEVICE FOR SIMULATING FLOWING SOILS. |
| CN201133870Y (en) * | 2007-12-11 | 2008-10-15 | 华南理工大学 | Slope adjustable tunnel fire hazard wind tunnel experimental device |
| JP2012180209A (en) * | 2011-03-02 | 2012-09-20 | Toshiba Elevator Co Ltd | Elevator door device adapting measures against draft |
| CN203350016U (en) * | 2013-07-18 | 2013-12-18 | 中国航天空气动力技术研究院 | Rapidly-replaceable wallboard for sub-transonic speed wind tunnel |
| CN103487228A (en) * | 2013-08-30 | 2014-01-01 | 北京航天益森风洞工程技术有限公司 | Side door opening/closing mechanism for hypersonic velocity wind tunnel test section |
| CN103487229A (en) * | 2013-08-30 | 2014-01-01 | 北京航天益森风洞工程技术有限公司 | Trisonics wind tunnel test section expansion angle adjusting mechanism |
| CN103487230A (en) * | 2013-09-24 | 2014-01-01 | 北京航天益森风洞工程技术有限公司 | Side door device of high vacuum test chamber |
| CN104614147A (en) * | 2015-01-29 | 2015-05-13 | 天津三电汽车空调有限公司 | Movable environment test chamber for automobile environment wind tunnel laboratory |
| CN105217513A (en) * | 2015-10-30 | 2016-01-06 | 吉林市长久专用车有限公司 | Portable double leval jib vehicle lift structure |
| CN205224918U (en) * | 2015-12-09 | 2016-05-11 | 中国航天空气动力技术研究院 | Be used for hatch door opening device on experimental cabin |
| CN106525382A (en) * | 2016-12-20 | 2017-03-22 | 中国航天空气动力技术研究院 | Push rod and wind tunnel test section side door device |
| CN110274744A (en) * | 2019-07-04 | 2019-09-24 | 中建六局建设发展有限公司 | A kind of demoulding method for wind-tunnel diffuser internal model support system |
| CN110984793A (en) * | 2019-12-09 | 2020-04-10 | 中国航天空气动力技术研究院 | But two-way moving's vertical hinged door |
| CN111005644A (en) * | 2019-12-10 | 2020-04-14 | 北京航天益森风洞工程技术有限公司 | High-vacuum test chamber side door device and opening and closing method |
| CN112098036A (en) * | 2020-11-23 | 2020-12-18 | 中国空气动力研究与发展中心高速空气动力研究所 | Interference force calibration device and method for wind tunnel test blade supporting device |
-
2022
- 2022-04-08 CN CN202210362564.4A patent/CN114441132B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2676815A1 (en) * | 1991-05-24 | 1992-11-27 | Serv Souffleries In Et Const | IMPROVEMENT FOR AERODYNAMIC BLOWERS WITH A DEVICE FOR SIMULATING FLOWING SOILS. |
| CN201133870Y (en) * | 2007-12-11 | 2008-10-15 | 华南理工大学 | Slope adjustable tunnel fire hazard wind tunnel experimental device |
| JP2012180209A (en) * | 2011-03-02 | 2012-09-20 | Toshiba Elevator Co Ltd | Elevator door device adapting measures against draft |
| CN203350016U (en) * | 2013-07-18 | 2013-12-18 | 中国航天空气动力技术研究院 | Rapidly-replaceable wallboard for sub-transonic speed wind tunnel |
| CN103487228A (en) * | 2013-08-30 | 2014-01-01 | 北京航天益森风洞工程技术有限公司 | Side door opening/closing mechanism for hypersonic velocity wind tunnel test section |
| CN103487229A (en) * | 2013-08-30 | 2014-01-01 | 北京航天益森风洞工程技术有限公司 | Trisonics wind tunnel test section expansion angle adjusting mechanism |
| CN103487230A (en) * | 2013-09-24 | 2014-01-01 | 北京航天益森风洞工程技术有限公司 | Side door device of high vacuum test chamber |
| CN104614147A (en) * | 2015-01-29 | 2015-05-13 | 天津三电汽车空调有限公司 | Movable environment test chamber for automobile environment wind tunnel laboratory |
| CN105217513A (en) * | 2015-10-30 | 2016-01-06 | 吉林市长久专用车有限公司 | Portable double leval jib vehicle lift structure |
| CN205224918U (en) * | 2015-12-09 | 2016-05-11 | 中国航天空气动力技术研究院 | Be used for hatch door opening device on experimental cabin |
| CN106525382A (en) * | 2016-12-20 | 2017-03-22 | 中国航天空气动力技术研究院 | Push rod and wind tunnel test section side door device |
| CN110274744A (en) * | 2019-07-04 | 2019-09-24 | 中建六局建设发展有限公司 | A kind of demoulding method for wind-tunnel diffuser internal model support system |
| CN110984793A (en) * | 2019-12-09 | 2020-04-10 | 中国航天空气动力技术研究院 | But two-way moving's vertical hinged door |
| CN111005644A (en) * | 2019-12-10 | 2020-04-14 | 北京航天益森风洞工程技术有限公司 | High-vacuum test chamber side door device and opening and closing method |
| CN112098036A (en) * | 2020-11-23 | 2020-12-18 | 中国空气动力研究与发展中心高速空气动力研究所 | Interference force calibration device and method for wind tunnel test blade supporting device |
Non-Patent Citations (2)
| Title |
|---|
| 张效融: "《电力机车总体及走行部》", 31 August 2011, 北京：中国铁道出版社 * |
| 王翼: "高超声速进气道启动问题研究", 《国防科学技术大学》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117232771A (en) * | 2023-11-10 | 2023-12-15 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Device and method for adjusting outlet angle of flexible wall jet pipe of large wind tunnel |
| CN117232771B (en) * | 2023-11-10 | 2024-01-23 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Device and method for adjusting outlet angle of flexible wall jet pipe of large wind tunnel |
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| CN114441132B (en) | 2022-06-17 |
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