A device for magnetic resonance examination in a simulated weightlessness model

Abstract

The application discloses a device suitable for magnetic resonance examination of a simulated weightlessness model and relates to the technical field of simulation experiment devices.The device suitable for magnetic resonance examination of the simulated weightlessness model comprises a base and a support frame rotatably connected to the top of the base, and an angle adjusting mechanism is installed on the support frame.The angle adjusting mechanism is used for binding a biological model and detecting the moving angle of the biological model, and the angle adjusting mechanism can be rotatably folded on the top of the base.The biological model is bound by the angle adjusting mechanism, and the angle deflection of the biological model under the weightlessness state can be detected, so as to simulate the posture change of a human body or an animal under the weightlessness state.The biological model can be bound at different positions of a swing rod, so that the coordinate position of a sample can be adjusted according to experimental requirements;and the precision scale for detecting the angle is optimized, the angle change of the longitudinal swing is converted into the rotating angle of a scale wheel disc, and the precision of the angle detection is accurate to 0.1°.

Description

Technical Field

[0001] This invention relates to the field of simulation experimental device technology, specifically to a device suitable for performing magnetic resonance examinations on a simulated weightlessness model. Background Technology

[0002] With the continuous advancement of space exploration and aerospace technology, an increasing number of researchers are focusing on the physiological effects of weightlessness on organisms. Weightlessness (such as microgravity in space) has a significant impact on the health of organisms, including physiological changes such as decreased bone density, muscle atrophy, and decreased immune system function. Therefore, experimental research simulating weightlessness has become an important research direction in the fields of biomedicine and space medicine.

[0003] Currently, many studies employ simulated weightlessness to explore changes in organisms under weightless conditions. Common simulation methods include buoyancy control in water and angle control. However, these experiments lack a device capable of simultaneously simulating weightlessness and precisely controlling the simulated angle within a magnetic resonance imaging (MRI) unit. MRI technology, with its advantages of high resolution, non-invasive detection, and no radiation, is widely used in biomedical research and disease diagnosis. In weightlessness-related biomedical research, MRI is an ideal tool, providing detailed images of biological tissues and organs, helping researchers understand the effects of weightlessness on various bodily systems.

[0004] However, existing magnetic resonance imaging (MRI) systems cannot directly maintain the specific orientation and angle of samples in weightlessness simulation experiments. Most existing devices only consider changes in the sample's position on the horizontal or vertical plane, lacking fine-grained adjustments for weightlessness simulation. Furthermore, the magnetic compatibility of existing devices often fails to meet the precise magnetic field control requirements of MRI, potentially leading to distortion of MRI results and affecting the accuracy and validity of the experiment. Therefore, designing a device capable of accurately simulating weightlessness during MRI while ensuring magnetic compatibility and stability remains a major technological challenge. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a device suitable for magnetic resonance imaging (MRI) examination of simulated weightlessness models, thus solving the problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device suitable for magnetic resonance imaging (MRI) of a simulated weightlessness model, comprising a base and a support frame rotatably connected to its top, wherein an angle adjustment mechanism is mounted on the support frame. The angle adjustment mechanism is used to bind the biological model and detect the movement angle of the biological model, and the angle adjustment mechanism can be rotatably folded onto the top of the base. The angle adjustment mechanism includes: A column is rotatably connected to the top of the base, and a rotating shaft is rotatably connected to the top front of the column; An arc-shaped scale is provided, with its center coaxial with the rotating shaft. One end of the arc-shaped scale is rotatably connected to the rotating shaft via a swing arm, and a rack is installed on the rear side of the arc-shaped scale. The swing arm is fixedly connected to the middle of the pivot, and a fixed traction rope is wound around the swing arm; A precision scale is slidably connected to the back of the arc-shaped scale and sleeved on the outside of the pendulum rod; The precision scale includes: The sliding base is slidably connected to the back of the arc-shaped scale; The sleeve rotates through the sliding seat and is sleeved on the outside of the rocker arm; The graduated wheel is mounted on the sleeve and located on top of the sliding seat; The gear mechanism, sleeved on the sleeve and meshing with the rack, is used to convert the sliding angle of the sliding seat on the arc-shaped scale into the rotation angle of the scale wheel.

[0007] Preferably, the scale wheel is fixedly connected to the sleeve, the gear mechanism includes a toothed column coaxially fixedly connected to the sleeve, and the toothed column meshes with the rack. The scale wheel has 100 small graduations per revolution, and the scale wheel rotates once when the precision scale gauge slides 10° on the scale wheel.

[0008] Preferably, the gear mechanism includes a gear post coaxially rotatably sleeved on a sleeve, and the gear post meshes with a rack. A rotating tube is rotatably sleeved on the surface of the sleeve above the gear post, and a scale wheel is fixedly sleeved on the rotating tube. A first gear is integrally machined at the bottom of the rotating tube. A second gear is fixedly connected to the bottom of the gear post. A connecting shaft is rotatably connected to one side of the interior of the sliding seat. A third gear and a fourth gear are fixedly connected to the upper and lower ends of the surface of the connecting shaft, respectively. The fourth gear meshes with the second gear, and the third gear meshes with the first gear. The rotational speed of the gear post is amplified tenfold to the scale wheel through the transmission ratio of the four gears. The scale wheel has 10 graduations per revolution. The sliding seat has a through-hole extending to the side for inserting the connecting shaft and the third gear. The bottom end of the connecting shaft is positioned by inserting it into the sliding seat. The top of the sliding seat is threaded with a positioning bolt, and the bottom end of the positioning bolt is inserted into the top end of the connecting shaft to position the connecting shaft.

[0009] Preferably, an indicator cover is fixedly connected to the top of the sliding seat. The indicator cover is positioned outside the scale wheel, and an elliptical groove for displaying the frontmost scale of the scale wheel is provided on the front side of the indicator cover.

[0010] Preferably, a T-shaped slide rail is fixedly connected to the rear side of the arc-shaped scale, the front side of the sliding seat is slidably sleeved on the slide rail, a fixing screw is threaded through the column, and a positioning hole is opened at one end of the rack for the fixing screw to be inserted.

[0011] Preferably, the base is U-shaped and has an internal rotatable balancing system for stabilizing the base. When in use, the balancing system rotates to be perpendicular to the base. When not in use, the balancing system rotates and is stored inside the base. The balancing system stabilizes the base by balancing the center of gravity of the base with its weight or by mechanical support. When the balancing system is stable by weight, the weight at both ends of the balancing system is greater than the weight in the middle part. When the balancing system adopts a mechanical support method, both ends of the balancing system are rotatably connected to support blocks through an axis along the length direction. When the support block rotates to the vertical position, its bottom surface is flush with the bottom surface of the balancing system. When the support block rotates to the horizontal position, its upper and lower surfaces are flush with the upper and lower surfaces of the balancing system. When the balancing system is housed inside the base, the support block located outside the base rotates to the vertical position, so that one end of the support block fits against the end face of the base to lock the balancing system.

[0012] Preferably, the top of the base is fixedly connected to two rotating seats, and the two rotating seats are rotatably connected to the vertical fixing rod and the column respectively by the first bolt and the second bolt. The vertical fixing rod is used to stabilize the column by diagonal pulling when the column is erected, and a notch adapted to the second bolt is opened on one side of the vertical fixing rod.

[0013] Preferably, the movable end of the vertical fixing rod and the column are connected by a through pin, and the vertical fixing rod and the column have corresponding pin holes adapted to the pin.

[0014] Preferably, the movable end of the vertical fixing rod and the column are connected by a third bolt. The surface of the column is provided with a groove for the third bolt to slide. Inside the column, on both sides of the groove away from the second bolt, there are fixed blocks. The surface of the third bolt and inside the column are fitted with a sliding sleeve, and the inside of the sliding sleeve is bonded with a rubber sleeve. When the column is in the upright position, the third bolt moves to the top of the groove, and the third bolt is locked by pushing the sliding sleeve towards the block.

[0015] Preferably, a fixed shaft is fixedly connected to the right side of the column near the top, and a locking tongue is rotatably sleeved on the outside of the fixed shaft. A locking groove is provided at the right end of the base for the locking tongue to be inserted into.

[0016] This invention provides a device suitable for performing magnetic resonance imaging (MRI) scans on simulated weightlessness models. Compared with existing technologies, it has the following advantages: 1. This device, applicable to MRI examinations using simulated weightlessness models, uses an angle adjustment mechanism to attach a biological model and detect its angular deflection in a weightless state. This simulates the posture changes of humans or animals in weightlessness. The biological model can be attached to different positions on a pendulum, allowing for adjustment of the sample's coordinates according to experimental needs. Furthermore, the device optimizes the precision scale for angle detection, converting the longitudinal swing angle change into the rotation angle of the scale wheel, achieving an angle detection accuracy of 0.1°. High-precision detection is achieved purely mechanically without using a precision angle sensor, ensuring the accuracy of experimental data. Compared to the complex structures of other electronic solutions, it also has a competitive market price advantage, and its simple structure reduces electromagnetic interference.

[0017] 2. This device, suitable for MRI examination using a simulated weightlessness model, features a balancing system on its base. When not in use, the system can be folded up to reduce space, and when in use, it can be unfolded to form a cross-shaped structure with the base, effectively improving the stability of the device. The balancing system has two modes: a gravity-balanced structure that is simple and easy to operate, and a mechanical support structure that provides greater stability. Additionally, the support blocks used for auxiliary support can lock the balancing system inside the base after it is folded up, making it easier to store.

[0018] 3. This device, applicable to magnetic resonance imaging (MRI) of simulated weightlessness models, uses a vertical fixing rod to tension the column, providing stable support when the column is erected, thus ensuring its stable standing. There are two connection methods between the vertical fixing rod and the column. The first method uses a pin-type connection, which is simple and convenient to operate, but its disadvantage is that the vertical fixing rod lacks constraint when stored, making it prone to swaying. The second method keeps the vertical fixing rod connected to the column at all times. After erection, a simple sliding sleeve operation locks the vertical fixing rod to the column, preventing it from being laid down. Using this method, after the column is laid down and locked, the vertical fixing rod can also be locked simultaneously, facilitating storage.

[0019] 4. This device, suitable for MRI examination of simulated weightlessness models, has a locking tongue on the side of the column. After the column is laid down, the locking tongue can be rotated to insert into the locking groove to lock the column and the base together, so that it will not fall apart when stored. The operation is simple and convenient. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the invention. Figure 1 ; Figure 2 This is a schematic diagram of the invention. Figure 2 ; Figure 3 This is a schematic diagram of the storage state of the present invention; Figure 4 This is a schematic diagram of the structure of the second embodiment of the present invention; Figure 5 This is a schematic diagram of the second embodiment of the present invention; Figure 6 This is a schematic diagram of the connection method according to the third embodiment of the present invention; Figure 7 This is a schematic diagram of the connection method in the second embodiment of the third embodiment of the present invention; Figure 8 This is a schematic diagram of the sliding sleeve and rubber sleeve of the present invention; Figure 9 This is a bottom view of the invention in its stored state.

[0021] In the diagram: 1. Base, 2. Column, 3. Swing arm, 4. Arc-shaped scale, 5. Swing rod, 6. Precision scale, 61. Sliding seat, 62. Sleeve, 63. Gear column, 64. Scale wheel, 65. Indicator cover, 66. Elliptical groove, 67. First gear, 68. Second gear, 69. Rotating tube, 610. Connecting shaft, 611. Third gear, 612. Fourth gear, 613. Positioning bolt, 7. Fixed traction rope, 8. Fixed screw, 9. Vertical fixing rod, 10. Balance system, 11. Support block, 12. Rotating seat, 13. First bolt, 14. Second bolt, 15. Third bolt, 16. Pin, 17. Notch, 18. Fixed shaft, 19. Locking tongue, 20. Locking groove, 21. Sliding sleeve, 22. Rubber sleeve, 23. Positioning hole, 24. Sliding groove, 25. Stop block, 26. Rotating shaft, 27. Slide rail, 28. Rack. Detailed Implementation

[0022] 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.

[0023] See Figures 1-9 This invention discloses a device suitable for magnetic resonance imaging (MRI) of a simulated weightlessness model, and provides the following four technical solutions: Figures 1-5 The first embodiment is shown: it includes a base 1 and a support frame rotatably connected to its top, and an angle adjustment mechanism is mounted on the support frame. The angle adjustment mechanism is used to bind the biological model and detect the movement angle of the biological model, and the angle adjustment mechanism can be rotatably folded on the top of the base 1. The angle adjustment mechanism includes: The column 2 is rotatably connected to the top of the base 1, and the top front of the column 2 is rotatably connected to the pivot 26; The arc-shaped scale 4 is set with its center coaxial with the rotating shaft 26. One end of the arc-shaped scale 4 is rotatably connected to the rotating shaft 26 through the swing arm 3. A rack 28 is installed on the rear side of the arc-shaped scale 4. The swing arm 5 is fixedly connected to the middle of the rotating shaft 26, and a fixed traction rope 7 is wound around the swing arm 5; The precision scale 6 is slidably connected to the rear side of the arc-shaped scale 4 and is sleeved on the outside of the swing arm 5; Precision scale 6 includes: The sliding seat 61 is slidably connected to the rear side of the arc-shaped scale 4; the rear side of the arc-shaped scale 4 is fixedly connected to a T-shaped slide rail 27, and the front side of the sliding seat 61 is slidably sleeved on the slide rail 27. The column 2 is threaded with a fixing screw 8 through it. One end of the rack 28 is provided with a positioning hole 23 for the fixing screw 8 to be inserted. The fixing screw 8 is used to fix the arc-shaped scale 4 after it is unfolded, keeping the 0 mark of the arc-shaped scale 4 at the bottom. When storing, the fixing screw 8 can be unscrewed to rotate the arc-shaped scale 4. The sleeve 62 rotates through the sliding seat 61 and is sleeved on the outside of the rocker arm 5; A scale wheel 64 is mounted on a sleeve 62 and located on top of a sliding seat 61; an indicator cover 65 is fixedly connected to the top of the sliding seat 61, the indicator cover 65 covers the outside of the scale wheel 64, and an elliptical groove 66 for displaying the frontmost scale of the scale wheel 64 is provided on the front side of the indicator cover 65. The gear mechanism is sleeved on the sleeve 62 and meshes with the rack 28. It is used to convert the sliding angle of the sliding seat 61 on the arc-shaped scale 4 into the rotation angle of the scale wheel 64.

[0024] Gear mechanisms have the following two types: Method 1: The scale wheel 64 is fixedly connected to the sleeve 62. The gear mechanism includes a gear post 63 coaxially fixedly connected to the sleeve 62, and the gear post 63 meshes with the rack 28. The scale wheel 64 has 100 small graduations in one revolution. When the precision scale 6 slides 10° on the scale wheel 64, the scale wheel 64 rotates one revolution.

[0025] Method 2: The gear mechanism includes a gear post 63 coaxially rotatably mounted on a sleeve 62, and the gear post 63 meshes with a rack 28. A rotating tube 69 is rotatably mounted on the surface of the sleeve 62 above the gear post 63, and a scale wheel 64 is fixedly mounted on the rotating tube 69. A first gear 67 is integrally machined at the bottom of the rotating tube 69. A second gear 68 is fixedly connected to the bottom of the gear post 63. A connecting shaft 610 is rotatably connected to one side of the interior of the sliding seat 61. A third gear 611 and a fourth gear 612 are fixedly connected to the upper and lower ends of the surface of the connecting shaft 610, respectively. The fourth gear 612 meshes with the second gear 68, and the third gear 611 meshes with the first gear 67. The rotational speed of the gear post 63 is amplified tenfold to the scale wheel 64 through the transmission ratio of the four gears. The scale wheel 64 has 10 graduations in one revolution. The sliding seat 61 has a slot extending through to the side for inserting the connecting shaft 610 and the third gear 611. The bottom end of the connecting shaft 610 is positioned by inserting it into the sliding seat 61. The top of the sliding seat 61 is threaded with a positioning bolt 613, and the bottom end of the positioning bolt 613 is inserted into the top end of the connecting shaft 610 to position the connecting shaft 610.

[0026] This device uses an angle adjustment mechanism to attach a biological model and detect the angular deflection of the biological model in a weightless state, thereby simulating the posture changes of a human or animal in a weightless state. The biological model can be attached to different positions on the pendulum 5, allowing the coordinate position of the sample to be adjusted according to experimental needs. Furthermore, the device has optimized the precision scale 6 for detecting the angle, converting the change in the longitudinal swing angle into the rotation angle of the scale wheel 64, thus making the angle detection accuracy accurate to 0.1°. Without using a precision angle sensor, high-precision detection is achieved through a purely mechanical method, ensuring the accuracy of experimental data. Compared to the complex structure of other electronic solutions, it also has a competitive advantage in market price, and the simple structure also reduces electromagnetic interference.

[0027] Figures 1-3 The second embodiment is shown. The main difference from the first embodiment is that the base 1 is U-shaped and has a balancing system 10 for stabilizing the base 1 rotatably connected inside. When the balancing system 10 is in use, it rotates to be perpendicular to the base 1. When the balancing system 10 is not in use, it rotates and is stored inside the base 1. The balancing system 10 stabilizes the base 1 by balancing the center of gravity of the base 1 by weight or by mechanical support. When the balance system 10 is stable by weight, the weight at both ends of the balance system 10 is greater than the weight in the middle part. When the balancing system 10 adopts a mechanical support method, both ends of the balancing system 10 are rotatably connected to support blocks 11 through shafts along the length direction. When the support block 11 is rotated to the vertical position, its bottom surface is flush with the bottom surface of the balancing system 10. When the support block 11 is rotated to the horizontal position, its upper and lower surfaces are flush with the upper and lower surfaces of the balancing system 10. When the balancing system 10 is housed inside the base 1, the support block 11 located outside the base 1 is rotated to the vertical position, so that one end of the support block 11 fits against the end face of the base 1 to lock the balancing system 10.

[0028] By setting a balancing system 10 on the base 1, it can be folded up to reduce space when not in use, and unfolded when in use to form a cross-shaped structure with the base 1, which effectively improves the stability of the device. The balancing system 10 has two modes: the gravity balancing structure is simple and easy to operate, while the mechanical support type is more stable. At the same time, the support block 11 used for auxiliary support can lock the balancing system 10 inside the base 1 after it is folded up, making it easier to store.

[0029] Figures 6-8 The third embodiment is shown. The main difference from the first embodiment is that two rotating seats 12 are fixedly connected to the top of the base 1. The two rotating seats 12 are rotatably connected to the vertical fixing rod 9 and the column 2 by the first bolt 13 and the second bolt 14, respectively. The vertical fixing rod 9 is used to stabilize the column 2 by pulling it at an angle when it is erected. A notch 17 adapted to the second bolt 14 is provided on one side of the vertical fixing rod 9.

[0030] Method 1: The movable end of the vertical fixing rod 9 and the column 2 are connected by a through pin 16, and the vertical fixing rod 9 and the column 2 have corresponding pin holes adapted to the pin 16.

[0031] Method 2: The movable end of the vertical fixing rod 9 and the column 2 are connected by a third bolt 15. The surface of the column 2 is provided with a groove 24 for the third bolt 15 to slide. Inside the column 2, on both sides of the groove 24 away from the second bolt 14, there are fixed blocks 25. The surface of the third bolt 15 and inside the column 2 are provided with a sliding sleeve 21, and the inside of the sliding sleeve 21 is bonded with a rubber sleeve 22. When the column 2 is in the upright state, the third bolt 15 moves to the top of the groove 24, and the sliding sleeve 21 is pushed towards the block 25 to lock the third bolt 15.

[0032] By setting a vertical fixing rod 9 to tension the column 2, stable support can be provided when the column 2 is erected, thus ensuring the stable erection of the column 2. There are two ways to connect the vertical fixing rod 9 to the column 2. The first method uses a pin 16 for insertion, which is simple and convenient to operate. The disadvantage is that the vertical fixing rod 9 lacks restraint when stored and is prone to swinging. The second method keeps the vertical fixing rod 9 connected to the column 2 at all times. After being erected, the vertical fixing rod 9 can be locked to the column 2 by simply sliding the sliding sleeve 21, keeping the column 2 from falling down. Using this method, after the column 2 is laid down and locked, the vertical fixing rod 9 can also be locked simultaneously, which is convenient for storage.

[0033] Figure 9 The fourth embodiment is shown. The main difference from the first embodiment is that a fixed shaft 18 is fixedly connected to the right side of the column 2 near the top, and a locking tongue 19 is rotatably sleeved on the outside of the fixed shaft 18. A locking groove 20 is opened at the right end of the base 1 for the locking tongue 19 to be rotatably inserted.

[0034] By setting a locking tongue 19 on the side of the column 2, after the column 2 is laid down, the locking tongue 19 can be rotated to insert into the locking groove 20 to lock the column 2 and the base 1 together, so that it will not fall apart when stored. The operation is simple and convenient.

[0035] All structural components of the device are made of non-magnetic materials, and critical parts are designed with strict electromagnetic shielding to ensure that no electromagnetic interference or magnetic field distortion occurs during magnetic resonance imaging (MRI) examinations. In particular, the support frame and sample platform are constructed from high-strength composite materials, ensuring mechanical strength while minimizing the impact on the magnetic field.

[0036] The device of this invention is applicable to research in fields such as medicine, biology, and space science, and is particularly suitable for biomedical research institutions, animal laboratories, space medicine experimental platforms, and weightlessness biology research. By simulating a weightless environment and performing magnetic resonance imaging, this invention can provide data support for studying the long-term effects of weightlessness on organisms, the mechanisms of weightlessness-induced diseases, and related interventions and treatments.

[0037] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0038] When in use, first turn out the balancing system 10 so that it is perpendicular to the base 1. If there is a support block 11, before turning, first turn the support block 11 located on the outside of the base 1 to be flush with the balancing system 10. Then, after turning out the balancing system 10, turn the support blocks 11 on both sides to a vertical position for support. Then rotate the locking tongue 19 to slide it out of the locking groove 20, and then pull up the column 2. If the pin 16 is used for fixing, rotate the vertical fixing rod 9 to fit on the column 2, and then use the pin 16 to lock the column 2 and the vertical fixing rod 9 through it. If the column 2 and the vertical fixing rod 9 are directly connected, the vertical fixing rod 9 will automatically rotate up during the process of pulling up the column 2. After it is fully erected, the third bolt 15 is located at the top of the slide groove 24. Then slide the sliding sleeve 21 backward so that it is located inside the stop block 25, and then lock the third bolt 15. Next, pull the arc-shaped scale 4 to the right, rotate the fixing screw 8 so that its front end is inserted into the positioning hole 23, lock the arc-shaped scale 4, and then bind the experimental model to the pendulum 5 through the fixed traction rope 7. When the experimental model moves, the pendulum 5 drives the precision scale 6 to slide on the slide rail 27 behind the arc-shaped scale 4. At the same time, the gear 63 rotates due to its meshing with the rack 28. In the first method, the gear 63 directly drives the scale wheel 64 to rotate through the sleeve 62, and then the scale displayed on the front of the scale wheel 64 is observed through the elliptical groove 66. In the second method, when the gear 63 rotates, it drives the second gear 68 to rotate, and then drives the fourth gear 612 that meshes with it to rotate. Then, the connecting shaft 610 drives the third gear 611 to rotate, and drives the first gear 67 that meshes with it to rotate. The rotating tube 69 drives the scale wheel 64 to rotate, and then the scale displayed on the scale wheel 64 is observed. The data read is used for subsequent experimental research.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device suitable for performing magnetic resonance imaging (MRI) on a simulated weightlessness model, characterized in that: The system includes a base and a support frame rotatably connected to its top, with an angle adjustment mechanism mounted on the support frame. The angle adjustment mechanism is used to attach a biological model and detect the movement angle of the biological model. The angle adjustment mechanism is rotatably foldable on top of the base. The angle adjustment mechanism includes: A column is rotatably connected to the top of the base, and a rotating shaft is rotatably connected to the top front of the column; An arc-shaped scale is provided, with its center coaxial with the rotating shaft. One end of the arc-shaped scale is rotatably connected to the rotating shaft via a swing arm, and a rack is installed on the rear side of the arc-shaped scale. The swing arm is fixedly connected to the middle of the pivot, and a fixed traction rope is wound around the swing arm; A precision scale is slidably connected to the back of the arc-shaped scale and sleeved on the outside of the pendulum rod; The precision scale includes: The sliding base is slidably connected to the back of the arc-shaped scale; The sleeve rotates through the sliding seat and is sleeved on the outside of the rocker arm; The graduated wheel is mounted on the sleeve and located on top of the sliding seat; The gear mechanism, sleeved on the sleeve and meshing with the rack, is used to convert the sliding angle of the sliding seat on the arc-shaped scale into the rotation angle of the scale wheel.

2. The device for magnetic resonance imaging (MRI) of a simulated weightlessness model according to claim 1, characterized in that: The graduated wheel is fixedly connected to the sleeve. The gear mechanism includes a toothed column coaxially fixedly connected to the sleeve, and the toothed column meshes with the rack. The graduated wheel has 100 small graduations in one revolution. The precision scale rotates one revolution when the graduated wheel slides 10° on the graduated wheel.

3. The device for magnetic resonance imaging (MRI) of a simulated weightlessness model according to claim 1, characterized in that: The gear mechanism includes a gear column coaxially rotatably mounted on a sleeve, and the gear column meshes with a rack. A rotating tube is rotatably mounted on the surface of the sleeve above the gear column, and a scale wheel is fixedly mounted on the rotating tube. A first gear is integrally machined at the bottom of the rotating tube. A second gear is fixedly connected to the bottom of the gear column. A connecting shaft is rotatably connected to one side of the interior of the sliding seat. A third gear and a fourth gear are fixedly connected to the upper and lower ends of the surface of the connecting shaft, respectively. The fourth gear meshes with the second gear, and the third gear meshes with the first gear. The rotational speed of the gear column is amplified tenfold to the scale wheel through the transmission ratio of the four gears. The scale wheel has 10 graduations per revolution. The sliding seat has a through-hole extending to the side for inserting the connecting shaft and the third gear. The bottom end of the connecting shaft is positioned by inserting it into the sliding seat. The top of the sliding seat is threaded with a positioning bolt, and the bottom end of the positioning bolt is inserted into the top end of the connecting shaft to position the connecting shaft.

4. A device for performing magnetic resonance imaging (MRI) on a simulated weightlessness model according to any one of claims 1-3, characterized in that: An indicator cover is fixedly connected to the top of the sliding seat. The indicator cover is placed outside the scale wheel, and an elliptical groove is opened on the front side of the indicator cover to display the frontmost scale of the scale wheel.

5. The apparatus for magnetic resonance imaging (MRI) of a simulated weightlessness model according to claim 4, characterized in that: The rear side of the arc-shaped scale is fixedly connected to a T-shaped slide rail, the front side of the sliding seat is slidably sleeved on the slide rail, the column is threaded with a fixing screw through it, and one end of the rack is provided with a positioning hole for the fixing screw to be inserted.

6. The apparatus for magnetic resonance imaging (MRI) of a simulated weightlessness model according to claim 1, characterized in that: The base is U-shaped and has an internal rotatable balancing system for stabilizing the base. When in use, the balancing system rotates to be perpendicular to the base. When not in use, the balancing system rotates and is stored inside the base. The balancing system stabilizes the base by balancing the center of gravity of the base with its weight or by mechanical support. When the balancing system is stable by weight, the weight at both ends of the balancing system is greater than the weight in the middle part. When the balancing system adopts a mechanical support method, both ends of the balancing system are rotatably connected to support blocks through an axis along the length direction. When the support block rotates to the vertical position, its bottom surface is flush with the bottom surface of the balancing system. When the support block rotates to the horizontal position, its upper and lower surfaces are flush with the upper and lower surfaces of the balancing system. When the balancing system is housed inside the base, the support block located outside the base rotates to the vertical position, so that one end of the support block fits against the end face of the base to lock the balancing system.

7. The apparatus for magnetic resonance imaging (MRI) of a simulated weightlessness model according to claim 1, characterized in that: Two rotating seats are fixedly connected to the top of the base. The two rotating seats are rotatably connected to the vertical fixing rod and the column by the first bolt and the second bolt, respectively. The vertical fixing rod is used to stabilize the column by pulling it at an angle when it is erected. A notch is provided on one side of the vertical fixing rod to match the second bolt.

8. The apparatus for magnetic resonance imaging (MRI) of a simulated weightlessness model according to claim 7, characterized in that: The movable end of the vertical fixing rod and the column are connected by a through pin, and the vertical fixing rod and the column have corresponding pin holes for the pin to fit.

9. The apparatus for magnetic resonance imaging (MRI) of a simulated weightlessness model according to claim 7, characterized in that: The movable end of the vertical fixing rod and the column are connected by a third bolt. The surface of the column is provided with a groove for the third bolt to slide. Inside the column, on both sides of the groove away from the second bolt, there are fixed blocks. The surface of the third bolt and inside the column are fitted with a sliding sleeve, and the inside of the sliding sleeve is glued with a rubber sleeve. When the column is in the upright position, the third bolt moves to the top of the groove, and the third bolt is locked by pushing the sliding sleeve towards the block.

10. The apparatus for magnetic resonance imaging (MRI) of a simulated weightlessness model according to claim 1, characterized in that: A fixed shaft is fixedly connected to the right side of the column near the top, and a locking tongue is rotatably fitted on the outside of the fixed shaft. A locking groove is opened at the right end of the base for the locking tongue to be inserted into.

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