Safety protection device for biological experiment

Abstract

The invention relates to a safety protection device for biological experiments, which comprises a rotor and a rotating shaft which are arranged in a casing, a mounting cavity for mounting the rotor and the rotating shaft is arranged in the casing, a universal joint positioned between the rotor and the rotating shaft is arranged in the mounting cavity, the rotor and the rotating shaft are connected through the universal joint, and a dynamic support assembly is arranged between the rotor and the casing. The dynamic supporting assembly is used for providing supporting force opposite to the deflection direction when the rotor deflects. Due to the non-rigid connection between the rotor and the rotating shaft and the characteristic of the universal joint structure, the rotor can deflect within a certain range in the biological experiment process of the centrifugal machine, direct abrasion of deflection stress generated by balancing errors of the rotor to the rotating shaft is reduced, and therefore the risk of fatigue fracture of the rotating shaft is reduced; meanwhile, when the rotor deflects, active correction force opposite to the deflection direction can be generated in real time through dynamic supporting, the deflection amplitude of the rotor is actively restrained, the vibration risk during high-speed rotation is reduced, and safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of biological experiment safety, and particularly to a safety protection device for biological experiments. Background Art

[0002] During the teaching process of biology, centrifugation experiments for solid-liquid separation and liquid-liquid separation are often encountered. At this time, a centrifuge is required. A centrifuge is a key device for separating mixed solid-liquids or solutions, purifying biological macromolecules (such as proteins, DNA), and preparing nanomaterials. Its core principle is to achieve layered sedimentation of different density components in the sample through the centrifugal force generated by high-speed rotation.

[0003] However, the rotor and the rotating shaft of the traditional centrifuge are rigidly connected. When the rotor is used without being balanced, the torques received by the rotating shaft are different, and the rotor will cause significant wear to the rotating shaft. Prolonged wear will reduce the service life of the centrifuge, and even the rotor may be damaged and fly out of the centrifuge housing, posing a safety hazard. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a safety protection device for biological experiments to solve the problems that the rotor and the rotating shaft of the existing centrifuge are rigidly connected. When the centrifuge is used without being balanced, the torques received by the rotating shaft are different, the rotor will cause significant wear to the rotating shaft, prolonged wear will reduce the service life of the centrifuge, and even the rotor may be damaged and fly out of the centrifuge, posing a safety hazard.

[0005] The present invention is achieved through the following technical solutions:

[0006] A safety protection device for biological experiments includes a rotor and a rotating shaft disposed within a housing. An installation cavity for installing the rotor and the rotating shaft is provided within the housing. A universal joint is disposed within the installation cavity between the rotor and the rotating shaft. The rotor and the rotating shaft are connected through the universal joint. A dynamic support assembly is disposed between the rotor and the housing. The dynamic support assembly is configured to provide a support force in the direction opposite to the deflection direction when the rotor deflects.

[0007] Further defined, the dynamic support assembly includes a mounting plate, a first magnet, and a second magnet. The first magnet and the second magnet are opposite to each other vertically, and the polarities of the opposite surfaces are the same. A plurality of the first magnets and the second magnets are evenly distributed along the circumferential direction of the rotating shaft. The first magnet and the second magnet are respectively disposed on the mounting plate and the inner wall of the installation cavity. The mounting plate is connected to the universal joint.

[0008] Further defined, the dynamic support assembly further includes a third magnet disposed on the inner wall of the installation cavity. The third magnet is opposite to the first magnet vertically, and the polarities of the opposite surfaces are the same. The polarity of the end of the third magnet opposite to the first magnet is the same. A plurality of the third magnets are evenly distributed along the circumferential direction of the rotating shaft.

[0009] Further defined, the dynamic support assembly includes a housing for storing fluid and a support member. The housing is rotationally engaged with the installation cavity and is located below the rotor. A through hole communicating with its interior is provided on the top surface of the housing. The through hole extends in the direction of the support member. The through hole is in interference fit with the support member. One end of the support member away from the through hole is spherically connected to the rotor.

[0010] Further defined, the support member includes a first rack, a second rack, a gear, and a piston plate located in the through hole. Opposite sides of the first rack and the second rack are respectively engaged with both sides of the gear. One end of the first rack away from the through hole is spherically connected to the bottom surface of the rotor. The second rack is connected to the piston plate. The piston plate is in interference fit with the through hole.

[0011] Further defined, a sealing ring is provided between the piston plate and the through hole. Opposite sides of the sealing ring are respectively in contact with the piston plate and the through hole. The sealing ring is sleeved on the piston plate and is fixedly connected to it.

[0012] Further defined, the universal joint includes a hemispherical body, a hemispherical cover, a first rod body, and a second rod body. The hemispherical body is embedded in the hemispherical cover and the two can rotate relative to each other. Opposite sides of the hemispherical body and the hemispherical cover are respectively connected to the first rod body and the second rod body. The first rod body and the second rod body are respectively coaxially connected to the rotor and the rotating shaft.

[0013] Further defined, the universal joint further includes a ball. First chutes and second chutes are respectively provided on the outer wall of the hemispherical body and the inner wall of the hemispherical cover. The ball is located between the first chute and the second chute. Opposite sides of the ball are respectively in rolling fit with the first chute and the second chute. Both the first chute and the second chute are longitudinally arranged. The first chute and the second chute respectively extend along the circumferential direction of the hemispherical body and the hemispherical cover. A plurality of the first chutes and the second chutes are evenly distributed along the circumferential direction of the rotating shaft. The plurality of first chutes and the second chutes are opposite to each other one by one.

[0014] Further defined, a protective plate located on the deflection track of the rotor is provided on the inner wall of the installation cavity. The protective plate is of a cylindrical structure. A protective pad is provided on the side of the protective plate close to the rotor.

[0015] Further defined, the protective plate is rotationally engaged with the installation cavity.

[0016] The beneficial effects of the present invention are as follows:

[0017] Compared with traditional centrifuges, when the safety protection device for biological experiments in this application performs centrifugation operations on centrifuge tubes, since the rotor and the rotating shaft are not rigidly connected, and due to the characteristics of the universal joint structure, the rotor can be deflected within a certain range, reducing the direct wear of the rotating shaft caused by the deflection stress generated by the balancing error of the rotor, thereby reducing the risk of fatigue fracture of the rotating shaft; at the same time, when the rotor deflects, an active correction force opposite to the deflection direction can be generated in real time through dynamic support, actively suppressing the deflection amplitude of the rotor and reducing the vibration risk during high-speed rotation, improving safety.

[0018] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 is a cross-sectional view of Embodiment 1 of the present invention;

[0021] Figure 3 is a three-dimensional structural schematic diagram of Embodiment 1 of the present invention;

[0022] Figure 4 is a cross-sectional view of Embodiment 2 of the present invention;

[0023] Figure 5 is a three-dimensional structural schematic diagram of Embodiment 2 of the present invention;

[0024] Figure 6 is a structural schematic diagram of the dynamic support assembly in Embodiment 2 of the present invention;

[0025] Figure 7 is a structural schematic diagram of the universal joint in Embodiment 1 and Embodiment 2 of the present invention.

[0026] In the figure:

[0027] 1, housing; 101, rotor; 102, rotating shaft; 2, universal joint; 201, hemispherical body; 2011, first chute; 202, hemispherical cover; 2021, second chute; 203, first rod; 204, second rod; 205, ball; 3, mounting plate; 301, first magnet; 302, second magnet; 303, third magnet; 4, housing; 401, first rack; 402, second rack; 403, gear; 404, piston plate; 5, protective plate. DETAILED DESCRIPTION OF THE INVENTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings below is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0030] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the above description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "one side" and "the other side" is based on the orientation or positional relationship shown in the accompanying drawings or the orientation or positional relationship in which the product of the present invention is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, terms such as "first" and "second" are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0032] In addition, terms such as "the same" do not mean that the components are absolutely the same, but there may be slight differences. The term "vertical" only means that the positional relationship between components is more vertical relative to "parallel", and does not mean that the structure must be completely vertical, but can be slightly inclined.

[0033] Please refer to Figure 1-7 , the present invention provides the following technical solutions:

[0034] Embodiment 1: A safety protection device for biological experiments, including a rotor 101 and a rotating shaft 102 disposed in a casing 1. An installation cavity for installing the rotor 101 and the rotating shaft 102 is provided in the casing 1. A universal joint 2 is disposed in the installation cavity between the rotor 101 and the rotating shaft 102. The rotor 101 and the rotating shaft 102 are connected through the universal joint 2. A dynamic support assembly is disposed between the rotor 101 and the casing 1. The dynamic support assembly is used to provide a support force opposite to the deflection direction when the rotor 101 deflects.

[0035] In this solution, the rotor 101 and the rotating shaft 102 are connected by a universal joint 2. While enabling the rotating shaft 102 to drive the rotor 101 to rotate through the universal joint 2, the structural characteristics of the universal joint 2 (realizing variable-angle power transmission) allow the rotor 101 to adaptively deflect within the range of ±5°.

[0036] During specific use, a dynamic support assembly provides a supporting force for the rotor 101, enabling the rotor 101 to maintain a perpendicular state with the rotating shaft 102 when not in use and during normal use. Through the transmission of the universal joint 2 and the rotating shaft 102, the rotor 101 is prompted to rotate to achieve centrifugal operation.

[0037] When the rotor 101 is deflected during rotation due to external factors (for example, the rotor 101 and the centrifuge tube are not balanced before use), the dynamic support assembly will change adaptively with the degree of deflection. In this state, the supporting force of the dynamic support assembly on the upward-tilting and downward-tilting ends of the rotor 101 changes. The supporting force on the upward-tilting end of the rotor 101 decreases, and the supporting force on the downward-tilting end of the rotor 101 increases.

[0038] That is, compared with traditional centrifuges, when the safety protection device for biological experiments in this application performs centrifugal operation on centrifuge tubes, due to the non-rigid connection between the rotor 101 and the rotating shaft 102 and the characteristics of the universal joint 2 structure, the rotor 101 can be deflected within a certain range, reducing the direct wear of the rotating shaft 102 caused by the deflection stress generated by the balancing error of the rotor 101, thereby reducing the risk of fatigue fracture of the rotating shaft 102. At the same time, when the rotor 101 deflects, an active correction force opposite to the deflection direction can be generated in real time through dynamic support, actively suppressing the deflection amplitude of the rotor 101 and reducing the vibration risk during high-speed rotation, improving safety.

[0039] Among them, a motor for driving the rotation of the rotating shaft 102 and a cover plate located above the casing 1 are also provided inside the casing 1. The specific usage method is already a mature existing technology, so it will not be elaborated in this application.

[0040] In this embodiment, the dynamic support assembly includes a mounting plate 3, a first magnet 301, and a second magnet 302. The first magnet 301 and the second magnet 302 are opposite to each other up and down, and the polarities of the opposite surfaces are the same. A plurality of the first magnets 301 and the second magnets 302 are evenly distributed along the circumferential direction of the rotating shaft 102. The first magnet 301 and the second magnet 302 are respectively arranged on the mounting plate 3 and the inner wall of the mounting cavity, and the mounting plate 3 is connected to the universal joint 2.

[0041] In this solution, since the first magnet 301 and the second magnet 302 are opposite to each other and the polarities of their opposite ends are the same, the second magnet 302 fixed on the housing 1 generates a repulsive force on the first magnet 301 on the rotor 101. Multiple repulsive forces generated by a plurality of first magnets 301 and second magnets 302 that are circumferentially and evenly distributed support the bottom of the rotor 101 from multiple angles, forming a supporting force for the rotor 101 to maintain the balance state of the rotor 101 when it is not in use and during normal operation. Compared with the rigid connection of the traditional centrifuge rotor 101, this application uses the repulsive force of like-pole magnets to provide a supporting force for the rotor 101, which can reduce the mechanical friction loss suffered by the rotor 101;

[0042] When the rotor 101 deflects, the first magnet 301 at the upwardly inclined part approaches the second magnet 302 as the rotor 101 tilts. As the distance between the two decreases, the repulsive force received by the first magnet 301 close to the second magnet 302 increases;

[0043] The first magnet 301 at the upwardly inclined part gradually moves away from the second magnet 302 as the rotor 101 tilts. As the distance between the two increases, the repulsive force received by the first magnet 301 away from the second magnet 302 decreases.

[0044] That is, when the rotor 101 deflects, the supporting forces received at the upper and lower ends of the tilt will adaptively decrease and increase. Through this change, a greater supporting force is provided to the upwardly inclined end. On the one hand, the resistance suffered by the deflected rotor 101 is increased, and on the other hand, a corrective force for the deflected rotor 101 is formed.

[0045] At the same time, compared with the traditional centrifuge, after use, the rotor 101 will continue to rotate under the action of inertia. However, in this application, through the magnetic connection of multiple first magnets 301 and multiple second magnets 302, the influence of inertia on the rotor 101 can be reduced after use, thereby shortening the rotation time of the rotor 101.

[0046] In this embodiment, the dynamic support assembly further includes a third magnet 303 disposed on the inner wall of the installation cavity. The third magnet 303 is vertically opposite to the first magnet 301, and the polarities of the opposite faces are the same. The end of the third magnet 303 opposite to the first magnet 301 has the same polarity, and a plurality of third magnets 303 are evenly distributed along the circumference of the rotating shaft 102.

[0047] In this solution, since the first magnet 301 and the third magnet 303 are opposite to each other and the polarities of their opposite ends are the same, the third magnet 303 fixed on the housing 1 generates a repulsive force on the first magnet 301 on the rotor 101. Through the arrangement of the third magnet 303, the third magnet 303 and the second magnet 302 are respectively located at the upper and lower ends of the first magnet 301, forming an upper and lower double repulsive force on the first magnet 301. The upper and lower clamping forces on the mounting plate 3 are formed through the double repulsive force, further enhancing the supporting force received by the rotor 101.

[0048] During specific use, when the rotor 101 deflects, its inclined lower end approaches in the direction of the second magnet 302, and its inclined upper end approaches in the direction of the third magnet 303, prompting the second magnet 302 and the third magnet 303 to respectively generate greater repulsive forces on the inclined upper and lower ends. The two ends of the inclined rotor 101 are respectively corrected through the two repulsive forces with opposite acting directions, thereby further enhancing the correction force received by the rotor 101 during deflection.

[0049] In this embodiment, the universal joint 2 includes a hemisphere 201, a hemispherical cover 202, a first rod 203, and a second rod 204. The hemisphere 201 is embedded in the hemispherical cover 202 and the two can rotate relative to each other. The opposite sides of the hemisphere 201 and the hemispherical cover 202 are respectively connected to the first rod 203 and the second rod 204. The first rod 203 and the second rod 204 are respectively coaxially connected to the rotor 101 and the rotating shaft 102.

[0050] In this solution, through the spherical surface cooperation between the hemisphere 201 and the hemispherical cover 202, it is prompted that the first rod 203 and the second rod 204 can achieve multi-degree-of-freedom deflection when they are connected. And the rotor 101 can also achieve multi-degree-of-freedom deflection by connecting with the first rod 203. Through the connection of the first rod 203 and the second rod 204 to the rotor 101 and the rotating shaft 102 respectively, a non-rigid connection between the rotor 101 and the rotating shaft 102 is achieved.

[0051] In this embodiment, the universal joint 2 further includes a ball 205. First chutes 2011 and second chutes 2021 are respectively formed on the outer wall of the hemisphere 201 and the inner wall of the hemispherical cover 202. The ball 205 is located between the first chute 2011 and the second chute 2021. The opposite two sides of the ball 205 are respectively in rolling cooperation with the first chute 2011 and the second chute 2021. The first chute 2011 and the second chute 2021 are both longitudinally arranged, and the first chute 2011 and the second chute 2021 respectively extend along the circumferential direction of the hemisphere 201 and the hemispherical cover 202. A plurality of the first chutes 2011 and the second chutes 2021 are uniformly distributed along the circumferential direction of the rotating shaft 102, and the plurality of the first chutes 2011 and the second chutes 2021 are opposite to each other one by one.

[0052] Among them, the opening ends of the first slide groove 2011 and the second slide groove 2021 are respectively provided with radially inwardly protruding limit ribs, the width of the limit ribs is less than 1 / 3 of the diameter of the ball 205, and an interference fit is formed between the ball 205 and the slide groove. Through the setting of the limit ribs, the rolling range of the ball 205 is limited to prevent the ball 205 from escaping from the first slide groove 2011 and the second slide groove 2021.

[0053] In this solution, the cooperation between the ball 205 and the first sliding groove 2011 and the second sliding groove 2021 enables the hemispherical body 201 and the hemispherical cover 202 to be connected while having a certain degree of freedom.

[0054] The first and second chute grooves 2011 and 2021 distribute centrifugal force to the circumferential array of balls 205, preventing localized stress concentration and potential damage to the hemispherical joint. Furthermore, the first and second chute grooves 2011 and 2021 prevent balls 205 from disengaging during high-speed rotation, improving the reliability of the universal joint 2.

[0055] In this embodiment, a protective plate 5 located on the deflection trajectory of the rotor 101 is provided on the inner wall of the installation cavity. The protective plate 5 is a cylindrical structure, and a protective pad is provided on a side of the protective plate 5 close to the rotor 101 .

[0056] In this solution, when the rotor 101 is in a balanced state, the protective plate 5 is located on the periphery of the rotor 101. When the rotor 101 deflects and deflects to a certain extent, the rotor 101 and the protective plate 5 come into contact, and the protective pad absorbs part of the kinetic energy generated by the rotation and collision of the rotor 101, thereby reducing the collision damage between the rotor 101 and the casing 1. At the same time, the protective pad can also reduce the risk of secondary damage to the fragments when the centrifuge tube is broken.

[0057] The protective plate 5 is made of a rigid wear-resistant material, and the protective pad is made of an elastic material.

[0058] In this embodiment, the protective plate 5 is rotatably engaged with the installation cavity.

[0059] In this solution, since the protective plate 5 is rotated in conjunction with the mounting cavity, it can rotate coaxially with the rotating shaft 102. When the rotor 101 is deflected and contacts the protective plate 5, since the rotor 101 is in a rotating state, the rotor 101 is in contact with the protective pad and transfers part of the rotational kinetic energy to the protective plate 5, causing the protective plate 5 to rotate synchronously. Through the rotation of the two, a force unloading effect can be achieved on part of the impact force, thereby reducing the peak value of the loss impact.

[0060] Embodiment 2: The difference from Embodiment 1 is that in this embodiment, the dynamic support assembly includes a housing 4 for storing fluid and a support member. The housing 4 is rotatably fitted with the installation cavity and is located below the rotor 101. A through hole communicating with its interior is provided on the top surface of the housing 4, and the through hole extends in the direction of the support member. The through hole is in interference fit with the support member, and one end of the support member away from the through hole is ball-connected to the rotor 101.

[0061] In this solution, a plurality of through holes and support members are uniformly distributed in a ring with the rotor 101 as the axis;

[0062] Among them, the housing 4 stores incompressible fluid. One end of the support member is ball-connected to the rotor 101, so that when the rotor 101 deflects, the support member can move up and down in the through hole. By the cooperation of the support member and the through hole, the fluid in the housing 4 is extruded.

[0063] Through the characteristics of the fluid, a flexible support force is formed on the rotor 101 through the connection of the support member, so that the rotor 101 maintains a balanced state when not in use or during normal operation.

[0064] When the rotor 101 deflects, it pushes the support member to slide in the through hole. The support member connected to the upwardly inclined end of the rotor 101 will extrude the fluid. Under the reaction force of the fluid, a certain resistance and corrective force are formed on the deflection of the rotor 101 through the support member.

[0065] Among them, the rotor and the support member achieve multi-degree-of-freedom deflection through a ball joint.

[0066] In this embodiment, the support member includes a first rack 401, a second rack 402, a gear 403 and a piston plate 404 located in the through hole. The opposite sides of the first rack 401 and the second rack 402 are respectively engaged with both sides of the gear 403. One end of the first rack 401 away from the through hole is ball-connected to the bottom surface of the rotor 101, the second rack 402 is connected to the piston plate 404, and the piston plate 404 is in interference fit with the through hole.

[0067] In this solution, through the cooperation of the first rack 401, the gear 403 and the second rack 402, the displacement when the rotor 101 deflects is converted into the axial movement of the piston plate 404 in the through hole;

[0068] Therefore, when the rotor 101 deflects, the upwardly inclined and upwardly inclined ends respectively drive the relative two groups of piston plates 404 to move axially in the through hole. Under the meshing action of the first rack 401, the gear 403 and the second rack 402, the movement directions of the first rack 401 and the second rack 402 are opposite.

[0069] Taking the upwardly inclined end of the rotor 101 as an example, when the rotor 101 deflects, the upwardly inclined end drives the first rack 401 connected thereto to move upward synchronously. Since the first rack 401 and the second rack 402 are engaged by a gear 403 located therebetween, while the first rack 401 is urged to move upward, the second rack 402 moves downward synchronously, and then the piston plate 404 connected to the second rack 402 moves downward synchronously.

[0070] As the piston plate 404 moves downward within the through-hole, on the one hand, the fluid forms a reaction force on the piston plate 404, and on the other hand, the internal pressure of the through-hole in interference fit with the piston plate 404 increases, thereby pushing the fluid to flow into the through-hole where the downwardly inclined end of the rotor 101 is located, and then forming an enhanced supporting force on the downwardly inclined end of the rotor 101. Thus, through the cooperation of the characteristics of the fluid and the piston plate 404, relative supporting forces are formed on the relatively inclined ends of the rotor 101 to serve as a correcting force when the rotor 101 deflects.

[0071] By this means, an active correcting force opposite to the deflection direction is generated in real time, actively suppressing the yaw amplitude of the rotor 101, reducing the vibration risk during high-speed rotation, and enhancing safety.

[0072] In this embodiment, a sealing ring is provided between the piston plate 404 and the through-hole. The opposite sides of the sealing ring are respectively in contact with the piston plate 404 and the through-hole. The sealing ring is sleeved on the piston plate and is fixedly connected thereto.

[0073] In this solution, through the setting of the sealing ring, the interference fit between the piston plate 404 and the through-hole is effectively strengthened to ensure the pressure change within the through-hole when the piston plate 404 moves.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A safety protection device for biological experiments, comprising a rotor (101) and a rotating shaft (102) arranged in a casing (1), characterized in that: An installation cavity for installing a rotor (101) and a rotating shaft (102) is provided inside the housing (1). A universal joint (2) located between the rotor (101) and the rotating shaft (102) is provided in the installation cavity. The rotor (101) and the rotating shaft (102) are connected by the universal joint (2). A dynamic support assembly is provided between the rotor (101) and the housing (1). The dynamic support assembly is used to provide a support force in the direction opposite to the deflection direction when the rotor (101) deflects.

2. The safety protection device for biological experiments according to claim 1, wherein: The dynamic support assembly includes a mounting plate (3), a first magnet (301), and a second magnet (302). The first magnet (301) and the second magnet (302) face each other vertically, and the polarities of the opposite faces are the same. A plurality of the first magnets (301) and the second magnets (302) are evenly distributed along the circumferential direction of the rotating shaft (102). The first magnet (301) and the second magnet (302) are respectively arranged on the mounting plate (3) and the inner wall of the installation cavity. The mounting plate (3) is connected to the universal joint (2).

3. The safety protection device for biological experiments according to claim 1 or 2, characterized in that: The dynamic support assembly further includes a third magnet (303) arranged on the inner wall of the installation cavity. The third magnet (303) faces the first magnet (301) vertically, and the polarities of the opposite faces are the same. The polarity of one end of the third magnet (303) opposite to the first magnet (301) is the same. A plurality of the third magnets (303) are evenly distributed along the circumferential direction of the rotating shaft (102).

4. The safety protection device for biological experiments according to claim 1, wherein: The dynamic support assembly includes a housing (4) for storing fluid and a support member. The housing (4) is rotatably fitted with the installation cavity and is located below the rotor (101). A through hole communicating with its interior is provided on the top surface of the housing (4). The through hole extends in the direction of the support member. The through hole is in interference fit with the support member. One end of the support member away from the through hole is spherically connected to the rotor (101).

5. The safety protection device for biological experiments according to claim 4, wherein: The support member includes a first rack (401), a second rack (402), a gear (403), and a piston plate (404) located in the through hole. The opposite surfaces of the first rack (401) and the second rack (402) are respectively engaged with both sides of the gear (403). One end of the first rack (401) away from the through hole is spherically connected to the bottom surface of the rotor (101). The second rack (402) is connected to the piston plate (404). The piston plate (404) is in interference fit with the through hole.

6. The safety protection device for biological experiments according to claim 5, wherein: A sealing ring is provided between the piston plate (404) and the through hole. The opposite sides of the sealing ring are respectively in contact with the piston plate (404) and the through hole. The sealing ring is sleeved on the piston plate (404) and the two are fixedly connected.

7. The safety protection device for biological experiments according to claim 1, characterized in that: The universal joint (2) includes a hemispherical body (201), a hemispherical cover (202), a first rod body (203) and a second rod body (204). The hemispherical body (201) is embedded in the hemispherical cover (202) and the two can rotate relative to each other. Opposite sides of the hemispherical body (201) and the hemispherical cover (202) are respectively connected to the first rod body (203) and the second rod body (204). The first rod body (203) and the second rod body (204) are coaxially connected to the rotor (101) and the rotating shaft (102) respectively.

8. The safety protection device for biological experiments according to claim 7, wherein: The universal joint (2) further includes a ball (205). First chutes (2011) and second chutes (2021) are respectively formed on the outer wall of the hemispherical body (201) and the inner wall of the hemispherical cover (202). The ball (205) is located between the first chute (2011) and the second chute (2021). Opposite sides of the ball (205) are respectively in rolling fit with the first chute (2011) and the second chute (2021). Both the first chute (2011) and the second chute (2021) are longitudinally arranged. The first chute (2011) and the second chute (2021) respectively extend along the circumferential direction of the hemispherical body (201) and the hemispherical cover (202). A plurality of the first chutes (2011) and the second chutes (2021) are evenly distributed along the circumferential direction of the rotating shaft (102), and the plurality of the first chutes (2011) and the second chutes (2021) are opposite to each other one by one.

9. The safety protection device for biological experiments according to claim 1, wherein: A protective plate (5) located on the deflection track of the rotor (101) is provided on the inner wall of the installation cavity. The protective plate (5) is of a cylindrical structure, and a protective pad is provided on the side of the protective plate (5) close to the rotor (101).

10. The safety protection device for biological experiments according to claim 9, wherein: The protective plate (5) is in rotational fit with the installation cavity.

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