Weightlessness simulation experimental device

Abstract

The application discloses a weightlessness simulation experiment device, and relates to the technical field of animal weightlessness simulation, which comprises a wind tunnel unit and an observation unit. The wind tunnel unit comprises a wind tunnel and a fan. The wind tunnel is provided with an air inlet and an air outlet, and the air outlet is vertically arranged. The fan is used for making airflow flow out of the air outlet. The observation unit comprises a net cage, a support table, a vertical cylinder wall, a camera and an infrared physiological sensor. The lower end of the net cage is connected with the support table. The lower end of the support table is connected with the air outlet. The vertical cylinder wall is detachably connected in the net cage. The support table is provided with vertical through holes which are respectively communicated with the air outlet and the vertical cylinder wall. The camera is used for shooting mice in the vertical cylinder wall, and the infrared physiological sensor is used for monitoring the physiological state of the mice in the vertical cylinder wall. Compared with the prior art, the application can realize the whole-body uniform weightlessness simulation of mice, avoid the interference caused by the tail injury of the mice, and meet the demand of space life science research on high-precision and high-reliability simulation environment.

Description

Technical Field

[0001] This invention relates to the field of animal weightlessness simulation technology, and in particular to a weightlessness simulation experimental device. Background Technology

[0002] In life science research within the aerospace field, the impact of weightlessness on the physiological functions of organisms is one of the core research directions. Constructing ground-based simulation devices that closely resemble the actual weightlessness conditions in space is a fundamental prerequisite for conducting such research. Currently, the most widely used technique in the industry for weightlessness simulation experiments on model organisms such as mice is the tail suspension method. This method involves surgically or non-invasively suspending the mouse's tail, causing the hind limbs to detach from the support surface, thereby simulating the "hind limb deload" effect under weightlessness, and subsequently studying the effects of weightlessness on the mouse's musculoskeletal, cardiovascular, and endocrine systems.

[0003] However, as the requirements for research precision increase, the technical shortcomings of the tail suspension method have gradually become apparent, making it difficult to meet the needs for realism and reliability in weightless environment simulation. The specific problems are mainly reflected in the following aspects.

[0004] First, the tail suspension method only achieves localized de-loading of the mouse's hind limbs, while the head, forelimbs, and trunk remain continuously subjected to gravity. This differs fundamentally from the physical state of uniform de-loading of the entire organism in the weightless environment of space. This localized simulation leads to discrepancies between experimental data and the actual effects of weightlessness. For example, in studying the effects of weightlessness on skeletal muscle atrophy in mice, tail-suspended mice only showed significant atrophy in their hind limb skeletal muscles, while the forelimb and trunk muscles maintained normal physiological states due to continued gravitational stimulation. This contradicts the actual situation in space environments where mice experience atrophy of all their skeletal muscles, significantly impacting the reference value of the experimental results for space missions.

[0005] Secondly, during tail suspension, the mouse's tail needs to withstand continuous tension for a long time. Even if soft fixation materials are used, it can still easily lead to local tissue congestion and blood circulation disorders in the tail, and even cause skin abrasion or inflammatory reaction in the tail, affecting the mouse's physiological state.

[0006] Thirdly, on the one hand, the tail suspension device requires precise fixation of the mouse's tail. Excessive fixation force can cause injury to the mouse, while insufficient force can easily cause the mouse to break free or the suspension position to shift, increasing the difficulty of experimental operation and repeatability error. On the other hand, the range of motion of the mouse in the suspension state is strictly limited, making it difficult for researchers to observe its natural movement patterns in a weightless environment, such as limb coordination ability and suspension posture adjustment. Summary of the Invention

[0007] The purpose of this invention is to provide a weightlessness simulation experimental device to achieve uniform weightlessness simulation of the whole body of mice, avoid interference caused by tail injury of mice, and meet the needs of aerospace life science research for a high-precision and high-reliability simulation environment.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] This invention discloses a weightlessness simulation experimental device, comprising:

[0010] A wind tunnel unit, comprising a wind tunnel and a fan; the wind tunnel has an air inlet and an air outlet, the air outlet being vertically arranged; the fan is used to direct airflow out of the air outlet.

[0011] The observation unit includes a net cage, a support platform, a vertical cylindrical wall, a camera, and an infrared physiological sensor. The lower end of the net cage is connected to the support platform; the lower end of the support platform is connected to the air outlet; the vertical cylindrical wall is detachably connected to the net cage; the support platform has a vertical through hole, which communicates with both the air outlet and the vertical cylindrical wall; the camera is used to photograph mice inside the vertical cylindrical wall, and the infrared physiological sensor is used to monitor the physiological state of the mice inside the vertical cylindrical wall.

[0012] In some examples, the top of the cage is movably connected to the cage wall; the vertical cylindrical wall can enter and exit the cage from the top.

[0013] In some examples, a cushioning pad is connected to the lower side of the top of the wire mesh cage; the upper end of the vertical cylindrical wall abuts against and limits the cushioning pad, and the lower end of the vertical cylindrical wall abuts against and limits the bottom of the wire mesh cage.

[0014] In some examples, the vertical cylindrical wall is made of a transparent material.

[0015] In some examples, the observation unit also includes a protective cover fitted over the outside of the wire mesh cage; the protective cover is made of a transparent material.

[0016] In some examples, a horizontal partition is slidably mounted on the support platform in the horizontal direction; the horizontal partition is used to block the vertical through hole, and the horizontal partition can be pulled away from the support platform; the protective cover is provided with a side door and an operating hole, and the horizontal partition can enter and exit the side door.

[0017] In some examples, the weightlessness simulation experimental device further includes a support unit; the support unit includes a bracket, wheels, and adjustable height feet; the wind tunnel, the support platform, and the protective cover are all connected to the bracket; the wheels and the adjustable height feet are all installed at the lower end of the bracket.

[0018] In some examples, the wind tunnel unit further includes an upper filter and a lower filter; the wind tunnel is vertically arranged; the upper filter and the lower filter are both connected to the inner wall of the wind tunnel and are located above and below the fan, respectively.

[0019] In some examples, the air outlet is a conical structure for concentrating airflow; the bottom of the mesh cage is a honeycomb structure for adjusting the airflow to be vertical.

[0020] In some examples, the weightlessness simulation experimental device further includes an angle adjustment unit; the angle adjustment unit includes a frame, a mounting base, a connecting rod, and a sliding rod; the frame is connected to the support platform; the sliding rod is horizontally positioned and slidably connected to the frame along the vertical direction; the first end of the connecting rod is rotatably connected to the sliding rod and is limited along the axial direction of the sliding rod, the second end of the connecting rod is rotatably connected to the first end of the mounting base, and the second end of the mounting base is connected to the camera or the infrared physiological sensor; the portion of the mounting base located between the first and second ends is rotatably connected to the frame around a horizontal centerline.

[0021] Compared with related technologies, the present invention achieves the following technical effects:

[0022] By combining the net cage with the vertical cylindrical wall, the vertical cylindrical wall can be omitted before the weightlessness simulation experiment, allowing mice to be normally housed in the net cage. During the weightlessness simulation experiment, the vertical cylindrical wall is fixed inside the net cage, thus enabling the observation unit to serve both housing and experimental functions. This eliminates the need for frequent transfers of mice between the housing and experimental devices, allowing the mice to better adapt to the experimental environment and avoiding interference from stress-induced physiological responses caused by sudden environmental changes.

[0023] Before the weightlessness simulation experiment, without the vertical cage walls installed, the fans were turned on periodically each day to allow the mice to gradually adapt to the wind and noise. Then, with the vertical cage walls installed, the fans were turned on at low power periodically each day to allow the mice to adapt to the environment. Finally, with the vertical cage walls installed, the fan power was adjusted to allow the mice to float between the top and bottom of the cage. The mice were filmed using a camera, and their physiological state was monitored using an infrared physiological sensor.

[0024] The above process utilizes the detachable connection between the vertical cylinder wall and the net cage, as well as the cooperation between the observation unit and the wind tunnel unit, to allow the mice to gradually adapt to the experimental environment. This not only enables the simulation of uniform weightlessness throughout the mouse's body, but also avoids interference caused by tail injuries and reduces the stress physiological response caused by the sudden transition from the breeding environment to the experimental environment, thus meeting the needs of aerospace life science research for a high-precision and high-reliability simulation environment. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a weightlessness simulation experimental device from one perspective in some examples of the present invention;

[0027] Figure 2 This is a schematic diagram of the weightlessness simulation experimental device from another perspective in some examples of the present invention;

[0028] Figure 3 This is a cross-sectional view of a weightlessness simulation experimental apparatus from one perspective in some examples of the present invention;

[0029] Figure 4 This is a cross-sectional view of the weightlessness simulation experimental apparatus in some examples of the present invention from another perspective;

[0030] Figure 5 This is a schematic diagram of a local area where the observation unit is located in some examples of the present invention;

[0031] Figure 6 This is a schematic diagram of a portion of the horizontal partition in some examples of the present invention;

[0032] Figure 7 for Figure 5 A schematic diagram of the structure from another perspective.

[0033] In the picture:

[0034] 100-Weight loss simulation experimental apparatus;

[0035] 1-Wind tunnel unit; 11-Wind tunnel; 12-Fan; 13-Upper filter; 14-Lower filter;

[0036] 2-Observation unit; 21. Wire cage; 22. Support platform; 23. Vertical cylinder wall; 24. Camera; 25. Infrared physiological sensor; 26. Protective cover; 27. Horizontal partition; 28. Side door; 29. ​​Operating hole;

[0037] 3-Support unit; 31 Bracket; 32 Traveling wheels; 33 Adjustable height feet;

[0038] 4- Angle adjustment unit; 41 Frame; 42 Mounting base; 43 Linkage rod; 44 Slide rod;

[0039] 5-Control unit; 51 Power plug. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The purpose of this invention is to provide a weightlessness simulation experimental device to achieve uniform weightlessness simulation of the whole body of mice, avoid interference caused by tail injury of mice, and meet the needs of aerospace life science research for a high-precision and high-reliability simulation environment.

[0042] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Unless otherwise specified (such as rotatable connection, rotating connection), in this embodiment, "connection" refers to a fixed connection, which includes detachable fixed connections and non-detachable fixed connections.

[0043] Reference Figures 1-7 This embodiment provides a weightlessness simulation experimental device 100, including a wind tunnel unit 1 and an observation unit 2.

[0044] The wind tunnel unit 1 includes a wind tunnel 11 and a fan 12. The wind tunnel 11 has an air inlet and an air outlet, with the air outlet being vertically arranged. The fan 12 is used to direct the airflow out of the air outlet.

[0045] The observation unit 2 includes a mesh cage 21, a support platform 22, a vertical cylindrical wall 23, a camera 24, and an infrared physiological sensor 25. The lower end of the mesh cage 21 is connected to the support platform 22. The lower end of the support platform 22 is connected to an air outlet. The vertical cylindrical wall 23 is detachably connected to the mesh cage 21. The support platform 22 has vertical through holes that communicate with both the air outlet and the vertical cylindrical wall 23. The camera 24 is used to photograph the mice inside the vertical cylindrical wall, and the infrared physiological sensor 25 is used to monitor the physiological state of the mice inside the vertical cylindrical wall.

[0046] The working principle of the weightlessness simulation experimental device 100 in this embodiment is as follows:

[0047] The mesh cage 21 can be used for routine feeding of mice, but when air is released from the vent, the airflow will dissipate through the cage wall of the mesh cage 21, preventing the mice from obtaining the expected lift. After the vertical cylindrical wall 23 is connected to the inside of the mesh cage 21, it blocks the outer cage wall from the inside, forcing the airflow to flow vertically upward, thereby allowing the mice to obtain greater and more stable lift. However, due to the lateral closure provided by the vertical cylindrical wall 23, it is not possible to feed or sample the mice through the mesh openings in the cage wall.

[0048] By combining the net cage 21 with the vertical cylindrical wall 23, the vertical cylindrical wall 23 can be omitted before the weightlessness simulation experiment, allowing mice to be routinely housed within the net cage 21. During the weightlessness simulation experiment, the vertical cylindrical wall 23 is fixed within the net cage 21, thus enabling the observation unit 2 to serve both housing and experimental functions. This eliminates the need for frequent transfers of mice between the housing and experimental devices, allowing the mice to better adapt to the experimental environment and preventing stress-induced physiological responses caused by sudden environmental changes from interfering with the experimental results.

[0049] Specifically, before the weightlessness simulation experiment, without the vertical cylindrical wall 23 installed, the fan 12 can be turned on periodically each day to allow the mice to gradually adapt to the wind and noise. Then, with the vertical cylindrical wall 23 installed, the fan 12 can be turned on at low power periodically each day to allow the mice to adapt to the environment of the vertical cylindrical wall 23. Finally, with the vertical cylindrical wall 23 installed, the power of the fan 12 is adjusted to allow the mice to float between the top and bottom of the net cage 21. The mice are filmed using the camera 24, and their physiological state is monitored using the infrared physiological sensor 25.

[0050] The above process utilizes the detachable connection between the vertical cylinder wall 23 and the net cage 21, as well as the cooperation between the observation unit 2 and the wind tunnel unit 1, to allow the mice to gradually adapt to the experimental environment. This not only enables the simulation of uniform weightlessness throughout the mouse's body, but also avoids interference caused by tail injuries and reduces the stress physiological response caused by the sudden change from the breeding environment to the experimental environment, thus meeting the needs of aerospace life science research for a high-precision and high-reliability simulation environment.

[0051] In some examples, the top of the cage 21 is movably connected to the cage wall of the cage 21. The vertical cylindrical wall 23 can enter and exit the cage 21 from the top.

[0052] The movable connection of the cage top can be either completely removed from the cage wall or rotatably connected to the cage wall. The above-mentioned method of entering and exiting the vertical cylinder wall 23 is simple and convenient, and there is no need to open an additional cage door on the cage wall.

[0053] In some examples, a cushioning pad is connected to the underside of the top of the wire mesh cage 21. The upper end of the vertical cylindrical wall 23 abuts against the cushioning pad and the lower end of the vertical cylindrical wall 23 abuts against the bottom of the wire mesh cage 21.

[0054] It should be noted that the fan 12 inevitably generates vibration and noise during operation, which can affect the physiological state of mice. By setting a buffer pad on the underside of the cage top to fill the gap between the cage top and the vertical cylindrical wall 23 that is required for assembly, not only can the vertical cylindrical wall 23 be axially positioned, but it can also be radially positioned by friction under axial compression force. This eliminates the vibration and noise generated by the collision between the cage 21 and the vertical cylindrical wall 23, reducing the impact of vibration and noise on the physiological state of mice.

[0055] In some examples, the vertical cylindrical wall 23 is made of transparent material.

[0056] While the camera 24 and infrared physiological sensor 25 can monitor the mouse's condition, their monitoring angle is limited, resulting in blind spots. By selecting a vertical cylindrical wall 23 made of a transparent material, such as acrylic, the mouse can be observed manually from 360°, allowing for a better understanding of its changes.

[0057] In some examples, the observation unit 2 also includes a protective cover 26, which is fitted over the outside of the wire mesh cage 21. The protective cover 26 is made of transparent material.

[0058] Under the influence of high-speed airflow, fine particles near the net cage 21 gain high kinetic energy due to wind acceleration. Direct impact on vulnerable tissues such as the eyes can cause damage. By adding an additional protective shield 26, fine particles can be confined within the shield 26, preventing the airflow and entrained particles from directly impacting the human body and improving experimental safety.

[0059] In some examples, a horizontal partition 27 is slidably mounted on the support platform 22 in the horizontal direction. The horizontal partition 27 is used to block the vertical through hole and can be removed from the support platform 22. The protective cover 26 is provided with a side door 28 and an operating hole 29, and the horizontal partition 27 can enter and exit the side door 28.

[0060] During routine feeding of mice, the horizontal partition 27 closes the vertical opening, allowing it to collect food scraps, mouse feces, mouse hair, and other debris from above, preventing contamination or clogging of the fan 12 and reducing the frequency of fan 12 maintenance. The operating hole 29 can be used to feed food into the cage.

[0061] In some examples, the weightlessness simulation experimental apparatus 100 also includes a support unit 3. The support unit 3 includes a bracket 31, wheels 32, and adjustable height support legs 33. The wind tunnel 11, support platform 22, and protective cover 26 are all connected to the bracket 31. The wheels 32 and adjustable height support legs 33 are both mounted on the lower end of the bracket 31.

[0062] The wheels 32 are preferably omnidirectional wheels to facilitate the movement of the weightlessness simulation experiment device 100 to a designated location. Then, by adjusting the adjustable height support legs 33 until their lower ends are firmly against the ground, the position of the weightlessness simulation experiment device 100 is kept constant through the friction between the adjustable height support legs 33 and the ground.

[0063] For example, the support 31 is a square frame 41 composed of vertical and horizontal bars, with the lengths of the two lowest horizontal bars being greater than the lengths of the remaining horizontal bars. At least some of the height-adjustable feet 33 are mounted on the extensions of the longer lowest horizontal bars. The extension of the lower horizontal bars gives the support 31 a larger turning radius, thereby improving its anti-overturning ability.

[0064] In some examples, a control unit 5 is connected to the bracket 31, and the control unit 5 is connected to mains power via a power plug 51. The control unit 5 is electrically connected to the fan 12, the camera 24, and the infrared physiological sensor 25 for their control and power supply. The camera 24 and the infrared physiological sensor 25 can transmit monitoring data to a host computer via wired or wireless transmission, or they can store the monitoring data in their own built-in storage chip.

[0065] In some examples, the wind tunnel unit 1 also includes an upper filter 13 and a lower filter 14. The wind tunnel 11 is vertically arranged. The upper filter 13 and the lower filter 14 are both connected to the inner wall of the wind tunnel 11 and are located above and below the fan 12, respectively.

[0066] The upper filter 13 and the lower filter 14 can block particulate matter in the airflow, preventing particulate matter from injuring the mice. In addition, the upper filter 13 can also block falling particulate matter, preventing it from entering the fan 12.

[0067] In some examples, the air outlet is a conical structure used to concentrate the airflow. The bottom of the mesh cage 21 is a honeycomb structure used to adjust the airflow to be vertical.

[0068] While converging the airflow through a conical structure can increase wind speed, it also introduces radial disturbances to the airflow. By making the cage bottom a honeycomb structure, the airflow is allowed to pass through while being rectified, allowing the airflow to return to a vertically upward flow direction and preventing mice from frequently impacting the vertical cylinder wall under the action of radial airflow.

[0069] Furthermore, the mesh cage 21 is generally composed of thin, rod-like structures, which are easily grasped by the mouse's hand, preventing the mouse from floating. When the airflow increases to the point that the mouse slips from its grasp, the lift it experiences is far greater than its own weight, causing the mouse to hit the top of the cage and suffer injury. Although the vertical cylindrical wall 23 can prevent the mouse from grasping the cage wall, it cannot prevent the mouse from grasping the bottom of the cage.

[0070] In this embodiment, the bottom of the cage is set as a honeycomb structure with a large depth, which is generally no less than 30 mm, much larger than the length of a mouse's hand. Therefore, the mouse's hand cannot grasp the honeycomb structure by wrapping around it, ensuring that the mouse can float smoothly and avoiding impact injury caused by being forced out of its hand by airflow.

[0071] In some examples, the weightlessness simulation experimental device 100 also includes an angle adjustment unit 4. The angle adjustment unit 4 includes a frame 41, a mounting base 42, a connecting rod 43, and a sliding rod 44. The frame 41 is connected to the support platform 22. The sliding rod 44 is horizontally positioned and slidably connected to the frame 41 vertically. The first end of the connecting rod 43 is rotatably connected to the sliding rod 44 and is axially limited along the sliding rod 44. The second end of the connecting rod 43 is rotatably connected to the first end of the mounting base 42, and the second end of the mounting base 42 is connected to a camera 24 or an infrared physiological sensor 25. The portion of the mounting base 42 located between the first and second ends is rotatably connected to the frame 41 about a horizontal centerline.

[0072] By changing the height of the slide bar 44, the angle of the mounting base 42 can be adjusted, which in turn drives the camera 24 or the infrared physiological sensor 25 to adjust the angle, thereby achieving the adjustment of the monitoring angle.

[0073] After the slide bar 44 is adjusted to the specified height, it must maintain its height to resist the impact of high-speed airflow on the mounting base 42, camera 24, infrared physiological sensor 25, and other structures. There are several ways to lock the height of the slide bar 44, which can be flexibly selected by those skilled in the art. For example, the height of the slide bar 44 can be locked by screwing a screw into the end of the slide bar 44 and pressing the screw tightly against the frame 41.

[0074] There are several ways to limit the first end of the connecting rod 43 along the axial direction of the slide rod 44, and those skilled in the art can choose flexibly. For example, the axial positioning of the first end of the connecting rod 43 can be achieved by providing nuts or positioning shoulders on the slide rod 44 on both sides of the first end of the connecting rod 43.

[0075] In some examples, the cage wall of the wire mesh cage 21 is detachably connected to a feeding trough, which can be removed when installing the vertical cylindrical wall 23 to avoid obstructing the installation of the vertical cylindrical wall 23.

[0076] In some examples, fan 12 is an axial flow fan 12, which uses a DC motor with a DC speed controller, allowing manual adjustment of the wind speed, with an adjustment range of 1~30 m / s. The actual wind speed can be measured using a differential pressure gauge to ensure accuracy.

[0077] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A weightlessness simulation experimental device, characterized in that, include: A wind tunnel unit, comprising a wind tunnel and a fan; the wind tunnel has an air inlet and an air outlet, the air outlet being vertically arranged; the fan is used to direct airflow out of the air outlet. The observation unit includes a mesh cage, a support platform, a vertical cylindrical wall, a camera, and an infrared physiological sensor. The lower end of the mesh cage is connected to the support platform; the lower end of the support platform is connected to the air outlet; the vertical cylindrical wall is detachably connected to the mesh cage; the support platform has a vertical through hole, which communicates with both the air outlet and the vertical cylindrical wall; the camera is used to photograph mice inside the vertical cylindrical wall, and the infrared physiological sensor is used to monitor the physiological state of the mice inside the vertical cylindrical wall. The top of the wire mesh cage is movably connected to the cage wall; the vertical cylindrical wall can enter and exit the wire mesh cage from the top. The observation unit also includes a protective cover, which is fitted over the outside of the wire mesh cage; A horizontal partition is slidably installed on the support platform in the horizontal direction; the horizontal partition is used to block the vertical through hole, and the horizontal partition can be pulled away from the support platform; the protective cover is provided with a side door and an operating hole, and the horizontal partition can enter and exit the side door; The wind tunnel unit also includes an upper filter and a lower filter; the wind tunnel is vertically arranged; the upper filter and the lower filter are both connected to the inner wall of the wind tunnel and are located above and below the fan, respectively; The air outlet is a conical structure for concentrating airflow; the bottom of the mesh cage is a honeycomb structure for adjusting the airflow to be vertical.

2. The weightlessness simulation experimental apparatus according to claim 1, characterized in that: A buffer pad is connected to the lower side of the top of the wire mesh cage; the upper end of the vertical cylindrical wall abuts against the buffer pad and is limited, and the lower end of the vertical cylindrical wall abuts against the bottom of the wire mesh cage and is limited.

3. The weightlessness simulation experimental apparatus according to claim 1, characterized in that: The vertical cylindrical wall is made of a transparent material.

4. The weightlessness simulation experimental apparatus according to claim 3, characterized in that: The protective cover is made of transparent material.

5. The weightlessness simulation experimental apparatus according to claim 4, characterized in that: It also includes a support unit; the support unit includes a bracket, wheels, and adjustable height feet; the wind tunnel, the support platform, and the protective cover are all connected to the bracket; the wheels and the adjustable height feet are all installed at the lower end of the bracket.

6. The weightlessness simulation experimental apparatus according to claim 1, characterized in that: It also includes an angle adjustment unit; the angle adjustment unit includes a frame, a mounting base, a connecting rod, and a sliding rod; the frame is connected to the support platform; the sliding rod is horizontally arranged and slidably connected to the frame along the vertical direction; the first end of the connecting rod is rotatably connected to the sliding rod and is limited along the axial direction of the sliding rod, the second end of the connecting rod is rotatably connected to the first end of the mounting base, and the second end of the mounting base is connected to the camera or the infrared physiological sensor; the portion of the mounting base located between the first end and the second end is rotatably connected to the frame around a horizontal centerline.

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