A mechanical delivery device for wind tunnel free-drop tests

Abstract

This invention discloses a mechanical deployment device for wind tunnel free-drop tests, comprising: a base component, a drive component, and a trigger component; the base component, drive component, and trigger component are disposed inside the test model; the drive component is installed inside the base component and connected to the external attachment; one end of the trigger component is connected to the drive component, and the other end is installed on the test model. The mechanical deployment device for wind tunnel free-drop tests described in this invention has a stable and compact structure, high reliability, and is easy to use. It can achieve precise and stable deployment of external attachments, can be reused for different tests, and simultaneously improves efficiency and reduces costs.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel free-drop test technology, and particularly relates to a mechanical dropping device for wind tunnel free-drop tests. Background Technology

[0002] When external stores (including missiles, fuel tanks, or internal weapons) of an aircraft are launched or released, in order to avoid collisions between the external stores and the aircraft, it is necessary to analyze and predict the separation trajectory and kinematic characteristics of the external stores after release. Wind tunnel release tests are an important means of predicting and studying the trajectory of external stores. Therefore, the design of test devices that can ensure efficient, accurate and stable release of external stores is of great value.

[0003] In wind tunnel free-drop tests, the traditional process involves mounting the test model onto the wind tunnel testing structure. The external attachment model is typically installed at a corresponding position on the test model using fusible wire or hooks. After the wind tunnel airflow stabilizes, a manual control command is sent to trigger the release device, causing the external attachment to detach from the model. Simultaneously, high-speed cameras or multi-exposure photography are used to capture images of the external attachment's descent. These images are then digitally processed to obtain the trajectory and attitude angle changes over time, determining the parameter range for safe external attachment release and providing data support for aircraft external attachment layout design and release parameters. The drawback of this traditional unlocking method is that unlocking often fails after the wind picks up, or due to poor unlocking stability or slow response between the hook and the external attachment. Furthermore, the motion limitations of the connection method between the external attachment and the model result in poor repeatability, requiring a large number of tests. This not only increases costs and testing time but also significantly increases the difficulty of analyzing wind tunnel drop test data.

[0004] In the design of the release device for wind tunnel free-drop tests, in addition to ensuring the stability of the release process, sufficient precision is also required. Furthermore, the size should be as small as possible, the structure should be simple, and it should be easy to process and install. Therefore, the release device needs to be innovative in its structure. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a mechanical delivery device for wind tunnel free-drop tests. The device has a stable and compact structure, good reliability, and is easy to use. It can achieve accurate and stable delivery of external objects, can be reused for different tests, and at the same time improves efficiency and reduces costs.

[0006] To address the aforementioned technical problems, this invention discloses a mechanical delivery device for wind tunnel free-drop tests, comprising: a base component, a drive component, and a trigger component;

[0007] The base components, drive components, and trigger components are located inside the test model;

[0008] The drive unit is installed inside the base unit and connected to the external attachment;

[0009] One end of the triggering component is connected to the driving component, and the other end is mounted on the test model.

[0010] In the mechanical delivery device used in the aforementioned wind tunnel free-drop test, the base component includes: a lower end plate, an upper end plate, and an end plate connecting seat;

[0011] The lower end plate and the upper end plate are connected by screws via an end plate connector.

[0012] The lower and upper end plates are combined to perform aerodynamic shaping on the outer surface of the test model to achieve wing-body integration.

[0013] In the mechanical delivery device used in the wind tunnel free-drop test, several lower guide rail groups are provided on the lower end plate, and one upper guide rail group is provided on the upper end plate; the lower guide rail groups are parallel to each other and spaced apart; the guide of the lower guide rail groups and the upper guide rail groups is perpendicular to the axis of the external object.

[0014] In the mechanical delivery device used in the aforementioned wind tunnel free-drop test, the lower guide rail assembly includes: lower guide rail A and lower guide rail B; wherein, lower guide rail A and lower guide rail B are symmetrically arranged about the axis of the lower end plate; the upper guide rail assembly includes: upper guide rail A and upper guide rail B; wherein, upper guide rail A and upper guide rail B are symmetrically arranged about the axis of the upper end plate.

[0015] In the mechanical delivery device used in the aforementioned wind tunnel free-drop test, the driving components include: a first clamping arm, a second clamping arm, a push rod assembly, and a spring;

[0016] The first clamping arm and the second clamping arm have the same structure, and the first clamping arm and the second clamping arm are symmetrically arranged in the base component;

[0017] The spring is mounted on the push rod assembly;

[0018] One end of the push rod assembly is limited by the first clamping arm and the second clamping arm, and the other end is connected to the drive component.

[0019] In the mechanical delivery device used in the aforementioned wind tunnel free-drop test...

[0020] The upper surface of the first clamping arm is provided with a first upper slider, and the lower surface is provided with a plurality of first lower sliders; wherein, the position of the first upper slider corresponds to the position of the upper guide rail A, and the number and position of the first lower sliders correspond to the number and position of the lower guide rail A;

[0021] The upper surface of the second clamping arm is provided with a second upper slider, and the lower surface is provided with a number of second lower sliders; wherein, the position of the second upper slider corresponds to the position of the upper guide rail B, and the number and position of the second lower sliders correspond to the number and position of the lower guide rail B;

[0022] The first clamping arm is provided with a first limiting guide rail on its side, and the second clamping arm is provided with a second limiting guide rail on its side; wherein the first limiting guide rail and the second limiting guide rail are arranged facing each other.

[0023] In the mechanical delivery device used in the aforementioned wind tunnel free-drop test, the push rod assembly includes: a horizontal upper push rod, a horizontal lower push rod, and a vertical push rod;

[0024] The horizontal push rod and the vertical push rod are integrated into a single structure, forming a T-shaped structure;

[0025] The two ends of the horizontal push rod are right-angled structures, and are limited by the first upper slider and the second upper slider;

[0026] The horizontal lower push rod is located below the horizontal upper push rod, and the two ends of the horizontal lower push rod are located in the first limit guide rail and the second limit guide rail, respectively.

[0027] The spring is fitted onto the vertical push rod;

[0028] The tail of the vertical push rod is provided with a through hole for connecting to the drive component.

[0029] In the mechanical delivery device used in the aforementioned wind tunnel free-drop test, the triggering components include: an insulating assembly, a conductive post, and a constantan wire;

[0030] Insulating components are installed on the test model;

[0031] The insulating component is connected to one end of the constantan wire via a conductive post; the other end of the constantan wire is connected to a through hole at the tail of the vertical push rod.

[0032] In the mechanical delivery device used in the aforementioned wind tunnel free-drop test, when the mechanical delivery device is in the locked state, the following applies:

[0033] The first upper slider and the second upper slider are located in the upper guide rail A and the upper guide rail B respectively, and the first lower slider and the second lower slider are located in the corresponding lower guide rail A and the lower guide rail B respectively, so as to realize the limiting and fixing of the driving component in the base component;

[0034] One end of the first clamping arm and one end of the second clamping arm are embedded in the mating groove to lock the external object; wherein, the mating groove is installed on the external object;

[0035] Under the pulling force of the triggering component, the push rod assembly causes the right-angle structures at both ends of the horizontal push rod to hook onto the first upper slider and the second upper slider respectively, thereby locking the first clamping arm and the second clamping arm to restrict their movement; at this time, the spring is in a compressed state.

[0036] In the mechanical delivery device used in the aforementioned wind tunnel free-drop test, when the mechanical delivery device delivers external objects, the following applies:

[0037] When the constantan wire is energized, it melts and the spring releases the elastic potential energy stored in the compression, which drives the push rod assembly to move. The horizontal lower push rod moves along the first limit guide rail and the second limit guide rail, which pushes the first clamping arm and the second clamping arm to move to both sides along the guide of the lower guide rail group and the upper guide rail group. One end of the first clamping arm and one end of the second clamping arm disengage from the mating groove, completing the unlocking of the external object, and thus realizing the deployment of the external object.

[0038] The present invention has the following advantages:

[0039] (1) This invention discloses a mechanical delivery device for wind tunnel free delivery tests. By connecting the drive component with the external object, the accuracy of the delivery of the external object is ensured, and the problem of repeatability of the delivery object is effectively improved. It can accurately and stably deliver the external object in the wind tunnel delivery test, overcoming the shortcomings of the prior art.

[0040] (2) This invention discloses a mechanical delivery device for wind tunnel free delivery tests. All components are processed independently and then assembled. The structure is simple and easy to process. At the same time, the size constraints are small. If necessary, the components can be replaced individually to achieve repeated use for different test models, which reduces the test cost.

[0041] (3) The present invention discloses a mechanical delivery device for wind tunnel free delivery test. The entire mechanical delivery device is installed inside the test model and connected to the test model through upper and lower end plates. The end faces of the upper and lower end plates can be designed according to the aerodynamic shape of the corresponding test model to achieve wing-body integration, effectively reduce interference to the test airflow, improve the stability of test data, and make the measurement more accurate.

[0042] (4) This invention discloses a mechanical delivery device for wind tunnel free delivery tests. The drive component adopts a connection method of guide rail and slider, which ensures that the drive component runs in the required direction, improves the shortcomings of the traditional unlocking method in terms of unlocking success rate, and improves the unlocking stability.

[0043] (5) The present invention discloses a mechanical delivery device for wind tunnel free delivery test. The drive component is triggered by the trigger component to run along the guide rail direction. After a single test, the drive component returns to its original position along the guide rail direction, which reduces the installation difficulty of a single test and improves the efficiency of wind tunnel delivery test. Attached Figure Description

[0044] Figure 1 This is a front view of a mechanical delivery device in a wind tunnel free-drop test in an embodiment of the present invention, when the device is in a locked state.

[0045] Figure 2 This is a top view of a mechanical delivery device in a wind tunnel free-drop test in an embodiment of the present invention, when the device is in a locked state.

[0046] Figure 3 This is a front view of a mechanical delivery device in a wind tunnel free-drop test in an embodiment of the present invention, when the device is in the unlocked state.

[0047] Figure 4 This is a top view of a mechanical delivery device in a wind tunnel free-delivery test according to an embodiment of the present invention, when the device is in the unlocked state.

[0048] Figure 5 This is a schematic diagram of the internal structure assembly of a mechanical delivery device in a wind tunnel free-drop test according to an embodiment of the present invention;

[0049] Figure 6 This is a top view of a lower end plate according to an embodiment of the present invention;

[0050] Figure 7 This is a top view of an upper end plate in an embodiment of the present invention;

[0051] Figure 8 This is a three-dimensional view of a clamping arm in an embodiment of the present invention;

[0052] Figure 9 This is a front view of a clamping arm according to an embodiment of the present invention;

[0053] Figure 10 This is a schematic diagram of the structure of a push rod assembly in an embodiment of the present invention. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments disclosed in the present invention will be described in further detail below with reference to the accompanying drawings.

[0055] One of the core ideas of this invention is to address the problems of poor unlocking stability, increased test frequency due to unlocking failures, and increased cost and efficiency associated with traditional unlocking methods; the need to design separate delivery devices for different external attachments, making reuse difficult; and poor data repeatability due to motion limitations. This invention proposes a mechanical delivery device for wind tunnel free-drop tests that is structurally stable and compact, reliable, easy to use, and reusable for different tests. The aim is to achieve accurate and stable delivery of external attachments while improving efficiency and reducing costs.

[0056] like Figures 1-4 In this embodiment, the mechanical delivery device for the wind tunnel free-drop test includes: a base component 1, a drive component 2, and a trigger component 3. The base component 1, drive component 2, and trigger component 3 are disposed inside the test model; the drive component 2 is installed inside the base component 1 and connected to the external attachment 4; one end of the trigger component 3 is connected to the drive component 2, and the other end is installed on the test model. All components of the mechanical delivery device for the wind tunnel free-drop test are independently processed and assembled; the individual parts have simple structural designs, facilitating processing and maintenance.

[0057] In this embodiment, as Figure 1 and Figure 5 The base component 1 may specifically include: a lower end plate 11, an upper end plate 12, and an end plate connecting seat 13. The lower end plate 11 and the upper end plate 12 are connected by screws through the end plate connecting seat 13; the lower end plate 11 and the upper end plate 12 are machined to match the aerodynamic shape of the outer surface of the test model to achieve wing-body blending and reduce interference.

[0058] Preferred, such as Figure 6 and Figure 7 The lower end plate 11 is provided with several lower guide rail groups 14, and the upper end plate 12 is provided with an upper guide rail group 15; wherein the lower guide rail groups 14 are arranged parallel to each other and spaced apart. The guide direction of the lower guide rail groups 14 and the upper guide rail groups 15 is perpendicular to the axis of the external object 4. The base component 1 constrains the movement direction of the drive component 2 through the lower guide rail groups 14 and the upper guide rail groups 15 provided on the lower end plate 11 and the upper end plate 12, so as to ensure that the drive component 2 moves in the required direction.

[0059] Furthermore, the lower guide rail assembly 14 may specifically include a lower guide rail A141 and a lower guide rail B142. The lower guide rails A141 and B142 are symmetrically arranged about the axis of the lower end plate 11. It should be noted that the number of lower guide rail assemblies 14 can be set according to actual conditions, but is generally not less than two. For example, in this embodiment, the number of lower guide rail assemblies 14 is three. The three lower guide rail assemblies 14 constrain and limit each other, ensuring the stability of the movement of the driving component 2.

[0060] Furthermore, the upper guide rail assembly 15 may specifically include: upper guide rail A151 and upper guide rail B152. The upper guide rail A151 and upper guide rail B152 are symmetrically arranged about the axis of the upper end plate 12.

[0061] In this embodiment, as Figure 4The driving component 2 may specifically include: a first clamping arm 211, a second clamping arm 212, a push rod assembly 22, and a spring 23. The first clamping arm 211 and the second clamping arm 212 have identical structures and are symmetrically arranged within the base component 1. The spring 23 is mounted on the push rod assembly 22. One end of the push rod assembly 22 is limited by the first clamping arm 211 and the second clamping arm 212, and the other end is connected to the driving component 2.

[0062] Preferred, such as Figure 8 and Figure 9 The first clamping arm 211 has a first upper slider 241 on its upper surface and a plurality of first lower sliders 251 on its lower surface. The position of the first upper slider 241 corresponds to the position of the upper guide rail A151, and the number and position of the first lower sliders 251 correspond to the number and position of the lower guide rail A141. The second clamping arm 212 has a second upper slider 242 on its upper surface and a plurality of second lower sliders 252 on its lower surface. The position of the second upper slider 242 corresponds to the position of the upper guide rail B152, and the number and position of the second lower sliders 252 correspond to the number and position of the lower guide rail B142. The first clamping arm 211 has a first limiting guide rail 261 on its side, and the second clamping arm 212 has a second limiting guide rail 262 on its side. The first limiting guide rail 261 and the second limiting guide rail 262 are arranged facing each other.

[0063] Preferred, such as Figure 10 The push rod assembly 22 may specifically include: a horizontal upper push rod 221, a horizontal lower push rod 222, and a vertical push rod 223. The horizontal upper push rod 221 and the vertical push rod 223 are an integral structure forming a T-shape. The two ends of the horizontal upper push rod 221 are right-angled structures, limited by a first upper slider 241 and a second upper slider 242. The horizontal lower push rod 222 is located below the horizontal upper push rod 221, with its two ends positioned within a first limiting guide rail 261 and a second limiting guide rail 262, respectively. A spring 23 is fitted onto the vertical push rod 223. The tail of the vertical push rod 223 has a through hole for connection to the drive component 2.

[0064] In this embodiment, as Figure 1 The triggering component 3 specifically includes an insulating assembly 31, a conductive post 32, and a constantan wire 33. The insulating assembly 31 is mounted on the test model; the insulating assembly 31 is connected to one end of the constantan wire 33 via the conductive post 32; the other end of the constantan wire 33 is connected to a through hole at the tail of the vertical push rod 223. During deployment, the constantan wire 33 melts after being energized, and the push rod assembly 22 begins to move along the limiting guide rail, completing the activation of the entire mechanical deployment device. The use of the constantan wire 33 ensures both triggering speed and triggering stability.

[0065] In this embodiment, the working principle of the mechanical delivery device in the wind tunnel free-drop test is as follows:

[0066] When the mechanical dispensing device is in the locked state, we have:

[0067] The first upper slider 241 and the second upper slider 242 are respectively located within the upper guide rail A151 and the upper guide rail B152, and the first lower slider 251 and the second lower slider 252 are respectively located within the corresponding lower guide rail A141 and the lower guide rail B142, thereby limiting and fixing the driving component 2 within the base component 1. One end of the first clamping arm 211 and one end of the second clamping arm 212 are embedded in the mating groove 41 to lock the external object 4. Figure 3 The mating groove 41 is installed on the external object 4. Under the pulling force of the triggering component 3, the push rod assembly 22 causes the right-angle structures at both ends of the horizontal push rod 221 to hook the first upper slider 241 and the second upper slider 242 respectively, thereby locking the first clamping arm 211 and the second clamping arm 212, restricting the movement of the first clamping arm 211 and the second clamping arm 212, and ensuring that one end of the first clamping arm 211 and one end of the second clamping arm 212 are embedded in the mating groove 41, thus completing the locking of the external object 4. At this time, the spring 23 is in a compressed state.

[0068] When the mechanical delivery device delivers external object 4, the following occurs:

[0069] When the constantan wire 33 is energized, it melts and the spring 23 releases the elastic potential energy stored in the compression, which pushes the push rod assembly 22 to move. The horizontal lower push rod 222 moves along the first limiting guide rail 261 and the second limiting guide rail 262, pushing the first clamping arm 211 and the second clamping arm 212 to move to both sides along the guide of the lower guide rail group 14 and the upper guide rail group 15. While unlocking the clamping arms, it pushes the first clamping arm 211 and the second clamping arm 212 to move in a directional manner. One end of the first clamping arm 211 and one end of the second clamping arm 212 disengage from the mating groove 41, completing the unlocking of the external object 4, and thus realizing the deployment of the external object 4.

[0070] In summary, in this embodiment, when locked, the ends of the two clamping arms are embedded in the mating grooves 41 of the external object 4. Simultaneously, the push rod assembly 22 engages with the two upper sliders for limiting their position, ensuring the stability of the external object 4 in a windy environment in the wind tunnel. The push rod assembly 22 is pulled into the initial position by the constantan wire 33, causing the spring 23 to compress and accumulate elastic potential energy. After the test begins, power is manually applied, causing the constantan wire 33 to melt. The push rod assembly 22 receives a restoring force from the spring 23 and moves along the limiting guide rail, releasing the lock on the two upper sliders and simultaneously pushing the two clamping arms along the lower guide rail group 14 and the upper guide rail group 15, thus unlocking and deploying the external object 4. In this embodiment, all components of the mechanical deployment device are independently manufactured. Only some components need to be modified for different test objects with varying aerodynamic shapes, improving efficiency and saving costs. The components move via sliders and guide rails, improving response speed and ensuring triggering stability and success rate.

[0071] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

[0072] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A mechanical delivery device for wind tunnel free-drop tests, characterized in that, include: Base component (1), drive component (2), and trigger component (3); The base component (1), drive component (2), and trigger component (3) are located inside the test model; The drive component (2) is installed inside the base component (1) and connected to the external attachment (4); One end of the triggering component (3) is connected to the driving component (2), and the other end is installed on the test model; The driving component (2) includes: a first clamping arm (211), a second clamping arm (212), a push rod assembly (22), and a spring (23); wherein the first clamping arm (211) and the second clamping arm (212) have the same structure, and the first clamping arm (211) and the second clamping arm (212) are symmetrically arranged in the base component (1); the spring (23) is mounted on the push rod assembly (22); one end of the push rod assembly (22) is limited by the first clamping arm (211) and the second clamping arm (212), and the other end is connected to the driving component (2); The triggering component (3) includes: an insulating component (31), a conductive post (32), and a constantan wire (33); wherein the insulating component (31) is mounted on the test model; the insulating component (31) is connected to one end of the constantan wire (33) through the conductive post (32); the other end of the constantan wire (33) is connected to the through hole at the tail of the vertical push rod (223) in the push rod assembly (22).

2. The mechanical delivery device for wind tunnel free-drop tests according to claim 1, characterized in that, The base component (1) includes: a lower end plate (11), an upper end plate (12), and an end plate connecting seat (13); The lower end plate (11) and the upper end plate (12) are connected by screws through the end plate connecting seat (13); The lower end plate (11) and the upper end plate (12) are combined with the aerodynamic shape processing of the outer surface of the test model to achieve wing-body integration.

3. The mechanical delivery device for wind tunnel free-drop tests according to claim 2, characterized in that, The lower end plate (11) is provided with several lower guide rail groups (14), and the upper end plate (12) is provided with an upper guide rail group (15); wherein, each lower guide rail group (14) is arranged parallel to each other and spaced apart; the guide of the lower guide rail group (14) and the upper guide rail group (15) is: perpendicular to the axis of the external object (4).

4. The mechanical launching device for wind tunnel free-drop tests according to claim 3, characterized in that, The lower guide rail assembly (14) includes: a lower guide rail A (141) and a lower guide rail B (142); wherein the lower guide rail A (141) and the lower guide rail B (142) are symmetrically arranged about the axis of the lower end plate (11); the upper guide rail assembly (15) includes: an upper guide rail A (151) and an upper guide rail B (152); wherein the upper guide rail A (151) and the upper guide rail B (152) are symmetrically arranged about the axis of the upper end plate (12).

5. The mechanical delivery device for wind tunnel free-drop tests according to claim 4, characterized in that, The upper surface of the first clamping arm (211) is provided with a first upper slider (241), and the lower surface is provided with a plurality of first lower sliders (251); wherein, the position of the first upper slider (241) corresponds to the position of the upper guide rail A (151), and the number and position of the first lower sliders (251) correspond to the number and position of the lower guide rail A (141); The upper surface of the second clamping arm (212) is provided with a second upper slider (242), and the lower surface is provided with a plurality of second lower sliders (252); wherein, the position of the second upper slider (242) corresponds to the position of the upper guide rail B (152), and the number and position of the second lower sliders (252) correspond to the number and position of the lower guide rail B (142); The first clamping arm (211) is provided with a first limiting guide rail (261) on its side, and the second clamping arm (212) is provided with a second limiting guide rail (262) on its side; wherein the first limiting guide rail (261) and the second limiting guide rail (262) are arranged facing each other.

6. The mechanical delivery device for wind tunnel free-drop tests according to claim 5, characterized in that, The push rod assembly (22) includes: a horizontal upper push rod (221), a horizontal lower push rod (222), and a vertical push rod (223); The horizontal push rod (221) and the vertical push rod (223) are integrated into a single structure, forming a T-shaped structure; The two ends of the horizontal upper push rod (221) are right-angle structures, which are limited by the first upper slider (241) and the second upper slider (242); The horizontal lower push rod (222) is located below the horizontal upper push rod (221), and the two ends of the horizontal lower push rod (222) are located in the first limiting guide rail (261) and the second limiting guide rail (262) respectively; The spring (23) is fitted onto the vertical push rod (223); The tail of the vertical push rod (223) is provided with a through hole for connecting to the drive component (2).

7. The mechanical delivery device for wind tunnel free-drop tests according to claim 6, characterized in that, When the mechanical dispensing device is in the locked state, we have: The first upper slider (241) and the second upper slider (242) are located in the upper guide rail A (151) and the upper guide rail B (152) respectively, and the first lower slider (251) and the second lower slider (252) are located in the corresponding lower guide rail A (141) and the lower guide rail B (142) respectively, so as to realize the limiting and fixing of the driving component (2) in the base component (1); One end of the first clamping arm (211) and one end of the second clamping arm (212) are embedded in the mating groove (41) to lock the external object (4); wherein, the mating groove (41) is installed on the external object (4); Under the pulling force of the triggering component (3), the push rod assembly (22) causes the right-angle structures at both ends of the horizontal push rod (221) to hook the first upper slider (241) and the second upper slider (242) respectively, thereby locking the first clamping arm (211) and the second clamping arm (212) to restrict the movement of the first clamping arm (211) and the second clamping arm (212); at this time, the spring (23) is in a compressed state.

8. The mechanical delivery device for wind tunnel free-drop tests according to claim 7, characterized in that, When the mechanical delivery device delivers the external object (4), the following occurs: When the constantan wire (33) is energized, it melts and the spring (23) releases the elastic potential energy stored in the compression to push the push rod assembly (22) to move. The horizontal lower push rod (222) moves along the first limit guide rail (261) and the second limit guide rail (262), pushing the first clamping arm (211) and the second clamping arm (212) to move to both sides along the guide of the lower guide rail group (14) and the upper guide rail group (15). One end of the first clamping arm (211) and one end of the second clamping arm (212) disengage from the mating groove (41), completing the unlocking of the external object (4), and thus realizing the deployment of the external object (4).

Images