Bionic tortoise shell protective door and preparation method

Abstract

This invention discloses a biomimetic tortoise shell protective door and its manufacturing method, including a biomimetic tortoise shell door leaf, a door frame, and hinges for connecting the biomimetic tortoise shell door leaf and the door frame. The biomimetic tortoise shell door leaf includes an outer spherical shell panel for connecting the hinges, an inner spherical shell panel concentrically arranged with the outer spherical shell panel, a connecting ring for connecting the outer spherical shell panel and the inner spherical shell panel, and a biomimetic tortoise shell sandwich panel arranged between the outer spherical shell panel and the inner spherical shell panel. The outer spherical shell panel, the inner spherical shell panel, and the connecting ring form a cavity. The biomimetic tortoise shell sandwich panel divides the cavity into multiple filling cavities. A buffer energy-absorbing layer is arranged in the filling cavities. The connecting ring is provided with injection holes and a sealing structure for sealing the injection holes. The structure is stable and reliable, and can effectively absorb the energy of the explosion shock wave, significantly reduce the propagation of the explosion shock wave into the structure, reduce the damage to personnel inside the protective structure, reduce the overall weight of the protective door, and thus reduce the difficulty of opening and closing the door leaf.

Description

Technical Field

[0001] This invention relates to the field of safety protection engineering technology, and in particular, to a biomimetic tortoise shell protective door. Furthermore, this invention also relates to a method for preparing the biomimetic tortoise shell protective door. Background Technology

[0002] As the most important protective equipment at the entrance, safety doors play a decisive role in ensuring the overall safety of personnel and equipment within the project. With the rapid development of modern technology, the performance requirements for safety doors are also increasing. Therefore, developing high-performance, high-efficiency safety door structures is of great significance for maximizing the effectiveness of protective engineering and minimizing overall equipment damage.

[0003] Existing protective doors are mainly constructed of reinforced concrete and steel, and are primarily divided into flat doors or arched doors. For critical locations with high impact resistance requirements, the door thickness needs to be increased to improve the protection level. Using flat doors not only increases the weight of the door but also makes opening and closing more difficult. Increased door thickness also increases transportation costs and places higher demands on manufacturing processes, further increasing production costs. While arched doors can meet the needs in most situations, they are insufficient for dissipating blast waves in specific circumstances, such as when dealing with explosive shockwaves. Summary of the Invention

[0004] This invention provides a biomimetic tortoise shell protective door and its preparation method, in order to solve the technical problems of existing protective doors having large door weight, being difficult to open and close, and being unable to block explosive shock waves.

[0005] According to one aspect of the present invention, a biomimetic tortoise shell protective door is provided, comprising a biomimetic tortoise shell door leaf, a door frame, and a hinge for connecting the biomimetic tortoise shell door leaf and the door frame. The biomimetic tortoise shell door leaf includes an outer spherical shell panel for connecting the hinge, an inner spherical shell panel concentrically arranged with the outer spherical shell panel, a connecting ring for connecting the outer spherical shell panel and the inner spherical shell panel, and a biomimetic tortoise shell sandwich panel disposed between the outer spherical shell panel and the inner spherical shell panel. The outer spherical shell panel, the inner spherical shell panel, and the connecting ring form a cavity. The biomimetic tortoise shell sandwich panel divides the cavity into a plurality of filling cavities. A buffer energy-absorbing layer is disposed in each filling cavity. The connecting ring is provided with an injection hole and a sealing structure for sealing the injection hole.

[0006] Furthermore, the biomimetic turtle shell sandwich panel includes a regular polygonal frame and a connecting plate for connecting the vertices of the regular polygonal frame to the connecting ring, wherein the projection of the connecting plate on the radial plane of the connecting ring is arranged radially along the connecting ring.

[0007] Furthermore, the regular polygonal frame includes a central frame and peripheral frames closely arranged around the central frame, and the vertices of the peripheral frames are connected to the connecting ring through the connecting plate.

[0008] Furthermore, the connecting end of the connecting plate and the connecting ring is provided with corner support members.

[0009] Furthermore, the door frame includes a frame plate for connecting to the wall and a vertical plate supported by the frame plate, the vertical plate having a door opening adapted to the biomimetic tortoise shell door leaf.

[0010] Furthermore, the biomimetic turtle shell sandwich panel has through holes for connecting two adjacent filling cavities.

[0011] According to another aspect of the present invention, a method for preparing a biomimetic tortoise shell protective door is also provided, comprising the following steps:

[0012] S1. Prepare the door frame by stamping and flame cutting steel to obtain the frame plate and the upright plate, weld two adjacent frame plates together, and weld the frame plate and the upright plate together.

[0013] S2. Prepare a biomimetic tortoise shell door leaf. Obtain an outer spherical shell panel and an inner spherical shell panel by stamping and bending steel. Obtain an integrated structure of a biomimetic tortoise shell sandwich panel and a connecting ring by stamping, bending and flame cutting steel. Weld the connecting ring and the biomimetic tortoise shell sandwich panel to the outer spherical shell panel respectively, and weld the inner spherical shell panel to the connecting ring.

[0014] S3. Inject shear-thickening fluid into the filling cavity to form a buffer energy-absorbing layer;

[0015] S4. Weld the hinges to the bionic tortoise shell door leaf; place the door frame horizontally on the ground and weld the hinges connected to the bionic tortoise shell door leaf to the door frame.

[0016] Furthermore, step S3 specifically includes the following steps:

[0017] S31. Place the injection hole on the connecting ring facing upwards;

[0018] S31. Pour the shear thickening fluid into the filling cavity;

[0019] S33. The injection hole is welded and sealed through the encapsulation structure.

[0020] Further, the shear thickening liquid injected in step S3 includes a dispersed phase and a dispersion medium. The mass fraction of the dispersed phase in the shear thickening liquid is 45-55%. The dispersed phase consists of silica with an average particle size of 40-60 nm and zirconium dioxide with an average particle size of 40-60 nm. The mass ratio of zirconium dioxide to silica in the dispersed phase is 1:1. The dispersion medium is polyethylene glycol with an average molecular weight of 380-420 g / mol.

[0021] Furthermore, the door frame prepared in step S1 and / or the biomimetic tortoise shell door leaf prepared in step S2 are subjected to galvanized surface treatment.

[0022] The present invention has the following beneficial effects:

[0023] The biomimetic tortoise shell door leaf of this invention is spherical in shape. The spherical shape provides high structural strength, and the spherical panel ensures more even stress distribution, effectively preventing stress concentration and deformation, thus making the biomimetic tortoise shell door leaf structure more stable and reliable. The door frame is vertically fixed to the wall, and the biomimetic tortoise shell door leaf is connected to the door frame via hinges and can rotate around the hinges. The outer spherical shell panel, inner spherical shell panel, and connecting ring form a cavity, which is divided into multiple filling cavities by a biomimetic tortoise shell sandwich panel. This effectively guides the impact force to be evenly distributed when the biomimetic tortoise shell door leaf is subjected to strong impacts, making the structure more stable and reliable. The biomimetic tortoise shell door panel distributes stress more evenly, which is conducive to the uniform dissipation of energy and prevents stress concentration. It can withstand greater impact and is not easily deformed after being impacted. The filling cavity is equipped with a buffer energy-absorbing layer, which can effectively absorb the energy of the explosion shock wave, significantly reduce the propagation of the explosion shock wave into the interior of the structure, and reduce the damage to personnel inside the protective structure. The biomimetic tortoise shell protective door has a stable and reliable structure, which effectively enhances the strength of the protective door without increasing the thickness of the door panel, thereby avoiding increasing the overall weight of the protective door to improve the protection level and reducing the difficulty of opening and closing the door panel.

[0024] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 This is a front view of a preferred embodiment of the biomimetic tortoise shell protective door of the present invention;

[0027] Figure 2 This is a top view of a preferred embodiment of the biomimetic tortoise shell protective door of the present invention;

[0028] Figure 3This is a schematic diagram of the structure of the biomimetic tortoise shell door leaf of a preferred embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the door frame structure according to a preferred embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the biomimetic tortoise shell sandwich panel of a preferred embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the structure of the buffer energy-absorbing layer in a preferred embodiment of the present invention.

[0032] Legend:

[0033] 1. Bionic turtle shell door leaf; 11. Outer spherical shell panel; 12. Inner spherical shell panel; 13. Connecting ring; 131. Injection hole; 132. Encapsulation structure; 14. Bionic turtle shell sandwich panel; 141. Regular polygonal frame; 1411. Central frame; 142. Connecting plate; 143. Corner support; 144. Through hole; 15. Filling cavity; 16. Buffer energy absorption layer; 2. Door frame; 21. Frame plate; 22. Vertical plate; 23. Frame side plate; 24. Reinforcing rib; 3. Hinge; 31. Base plate; 32. Hinge seat; 33. Support plate; 34. Hinge shaft; 35. Bearing. Detailed Implementation

[0034] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0035] Please refer to the following: Figures 1 to 6 The biomimetic tortoise shell protective door of this embodiment includes a biomimetic tortoise shell door leaf 1, a door frame 2, and a hinge 3 for connecting the biomimetic tortoise shell door leaf 1 and the door frame 2. The biomimetic tortoise shell door leaf 1 includes an outer spherical shell panel 11 for connecting the hinge 3, an inner spherical shell panel 12 arranged concentrically with the outer spherical shell panel 11, a connecting ring 13 for connecting the outer spherical shell panel 11 and the inner spherical shell panel 12, and a biomimetic tortoise shell sandwich plate 14 arranged between the outer spherical shell panel 11 and the inner spherical shell panel 12. The outer spherical shell panel 11, the inner spherical shell panel 12 and the connecting ring 13 form a cavity. The biomimetic tortoise shell sandwich plate 14 divides the cavity into multiple filling cavities 15. A buffer energy-absorbing layer 16 is arranged in the filling cavity 15. An injection hole 131 and a sealing structure 132 for sealing the injection hole 131 are arranged on the connecting ring 13.

[0036] The biomimetic tortoise shell protective door of this embodiment has a spherical door leaf 1. The spherical door leaf structure has high strength, and the spherical panel makes the door leaf more evenly stressed, effectively preventing stress concentration and deformation, thus making the biomimetic tortoise shell door leaf 1 more stable and reliable. The door frame 2 is vertically fixed in the wall. The biomimetic tortoise shell door leaf 1 is connected to the door frame 2 via a hinge 3 and can rotate around the hinge 3. The outer spherical shell panel 11, the inner spherical shell panel 12, and the connecting ring 13 form a cavity. The biomimetic tortoise shell sandwich panel 14 divides the cavity into multiple filling cavities 15, effectively preventing the biomimetic tortoise shell door leaf 1 from being subjected to strong impacts. The uniform distribution of impact force makes the overall force on the bionic tortoise shell door leaf 1 more uniform, which is conducive to the uniform dissipation of energy and prevents stress concentration. It can withstand large impact forces and is not easily deformed after being impacted. The filling cavity 15 is equipped with a buffer energy-absorbing layer 16, which can effectively absorb the energy of the explosion shock wave, greatly reduce the propagation of the explosion shock wave into the structure, and reduce the damage to personnel inside the protective structure. The bionic tortoise shell protective door structure is stable and reliable, effectively enhancing the strength of the protective door without increasing the thickness of the door leaf, thereby avoiding increasing the overall weight of the protective door to improve the protection level and reducing the difficulty of opening and closing the door leaf.

[0037] like Figure 4 , Figure 5 and Figure 6 As shown, the biomimetic turtle shell sandwich panel 14 includes a regular polygonal frame 141 and connecting plates 142 for connecting the vertices of the regular polygonal frame 141 to the connecting ring 13. The projection of the connecting plates 142 on the radial plane of the connecting ring 13 is arranged radially along the connecting ring 13. In this embodiment, the projection of the regular polygonal frame 141 on the radial plane of the connecting ring 13 is a regular hexagon. The two ends of the regular polygonal frame 141 along the axial direction of the connecting ring 13 are respectively connected to the outer spherical shell panel 11 and the inner spherical shell panel 12. The six vertices of the regular hexagonal frame 141 are respectively connected to the connecting ring 13 through six connecting plates 142. The six connecting plates 142 are evenly arranged along the circumference of the connecting ring 13, and the connecting plates 142 are arranged radially along the connecting ring 13. The projection on the surface is arranged radially along the connecting ring 13. The bionic tortoise shell sandwich panel 14 has a simple structure and high strength, which can provide strong and stable support for the outer spherical shell panel 11 and the inner spherical shell panel 12. It can enhance the structural strength of the bionic tortoise shell door leaf 1, so that when the bionic tortoise shell door leaf 1 is subjected to strong impact, it can effectively guide the impact force to be evenly distributed, making the overall force of the bionic tortoise shell door leaf 1 more uniform, which is conducive to the uniform dissipation of energy and effectively enhances the strength of the bionic tortoise shell door leaf 1. It can withstand a large impact force and is not easily deformed after receiving an impact. It can be understood that the regular polygon frame 141 can also be an equilateral triangle, a regular quadrilateral, a regular pentagon, or a regular polygon with more or fewer sides. The number of connecting plates 142 can be increased or decreased accordingly based on the number of vertices of the regular polygon.

[0038] In this embodiment, the regular polygonal frame 141 includes a central frame 1411 and a peripheral frame closely arranged around the central frame 1411. The vertices of the peripheral frame are connected to the connecting ring 13 through the connecting plate 142. Taking the central frame 1411 of a regular hexagon as an example, a first ring of peripheral frames is closely arranged around the central frame 1411 (the central frame 1411 and the peripheral frame share the same side or the adjacent sides of the central frame 1411 and the peripheral frame are closely attached). The vertices of the first ring of peripheral frames away from the central frame 1411 are connected to the connecting ring 13 through the connecting plate 142. It can be understood that a second ring of peripheral frames can also be closely arranged around the first ring of peripheral frames around the central frame 1411. The vertices of the second ring of peripheral frames away from the central frame 1411 are connected to the connecting ring 13 through the connecting plate 142.

[0039] In this embodiment, corner support members 143 are provided at the connection end of the connecting plate 142 and the connecting ring 13 to increase the contact area between the connecting plate 142 and the connecting ring 13, so as to prevent the connecting ring 13 from bulging outward and deforming when it is impacted, which would cause it to be unable to fit the door opening, and ensure that the bionic tortoise shell protective door can be used normally.

[0040] In this embodiment, the door frame 2 includes a frame plate 21 for connecting to the wall and a vertical plate 22 supported by the frame plate 21. The vertical plate 22 has a door opening adapted to the biomimetic tortoise shell door leaf 1. Optionally, the bottom of the door opening is tangent to the bottom edge of the vertical plate 22 to avoid creating a step that could trip people. Optionally, the frame plate 21 is vertically provided with reinforcing ribs 24 for embedding in the wall, which makes the connection between the door frame 2 and the wall more secure and reliable, and provides good support for the overall biomimetic tortoise shell protective door. Optionally, as... Figure 4 As shown, the upper side of the left and right sides of the door frame 2 is provided with side frame plates 23. The side frame plates 21, side frame plates 23 and reinforcing ribs 24 are perpendicularly connected to each other, which can further improve the support strength of the door frame 2. It can be understood that side frame plates 23 can also be provided on the upper and lower sides of the door frame 2, which can be added or removed according to the usage requirements.

[0041] In this embodiment, the hinge 3 includes a base plate 31 mounted on the door frame 2, a hinge seat 32 mounted on the base plate 31, a support plate 33 for connecting the bionic tortoise shell door leaf 1, and a hinge shaft 34 for connecting the support plate 33 and the hinge seat 32. Optionally, a bearing 35 is mounted on the hinge seat 32, and the hinge shaft 34 is embedded in the bearing 35, which can reduce friction and simplify opening and closing. Optionally, the support plate 33 is connected to the outer spherical shell panel 11 or the connecting ring 13.

[0042] In this embodiment, the biomimetic turtle shell sandwich plate 14 is provided with a through hole 144 for connecting two adjacent filling cavities 15. Since the two adjacent filling cavities 15 are connected by the through hole 144, only one injection hole 131 needs to be opened on the connecting ring 13. On the one hand, it can avoid the connection ring 13 from having too many holes and affecting its own strength; on the other hand, it can improve the efficiency of injecting shear thickening liquid.

[0043] The method for preparing the biomimetic tortoise shell protective door in this embodiment includes the following steps:

[0044] S1. Prepare the door frame 2 by stamping and flame cutting steel to obtain the frame plate 21 and the upright plate 22, weld two adjacent frame plates 21, and weld the frame plate 21 and the upright plate 22.

[0045] S2. Prepare the biomimetic tortoise shell door leaf 1. Obtain the outer spherical shell panel 11 and the inner spherical shell panel 12 by stamping and bending steel. Obtain the biomimetic tortoise shell sandwich panel 14 and the connecting ring 13 by stamping, bending and flame cutting steel. Weld the connecting ring 13 and the biomimetic tortoise shell sandwich panel 14 to the outer spherical shell panel 11 respectively, and weld the inner spherical shell panel 12 to the connecting ring 13.

[0046] S3. Inject shear-thickening fluid into the filling cavity 15 to form a buffer energy-absorbing layer 16;

[0047] S4. Weld the hinge 3 to the bionic tortoise shell door leaf 1; place the door frame 2 horizontally on the ground, and weld the hinge 3 connected to the bionic tortoise shell door leaf 1 to the door frame 2.

[0048] The method for preparing the biomimetic turtle shell protective door in this embodiment involves connecting the outer spherical shell panel 11, the inner spherical shell panel 12, the connecting ring 13, and the biomimetic turtle shell sandwich panel 14 to form the biomimetic turtle shell door leaf 1 structure. This structure effectively guides the uniform distribution of impact force when the biomimetic turtle shell door leaf 1 is subjected to strong impact, making the overall force distribution of the biomimetic turtle shell protective door more uniform and facilitating uniform energy dissipation. The shear thickening liquid filled in the filling cavity is a dispersion system composed of a dispersed phase and a dispersion medium, exhibiting different characteristics with different shear rates. The dispersed phase is solid microparticles, and the dispersion medium is a low-molecular-weight organic or inorganic liquid. Alternatively, two or more mixed solvents can be used as the dispersion medium. Under equilibrium conditions, the dispersion... The system exhibits good fluidity; when the shear force exceeds its critical force, the viscosity of the dispersion system increases sharply, resulting in shear thickening, at which point it exhibits a solid-like state; when the shear force disappears, it quickly returns to a flowable state; it can improve the overall structure's impact resistance, effectively absorb the energy of explosive shock waves, significantly reduce the propagation of explosive shock waves into the structure, reduce damage to personnel inside the protective structure, and has recovery capabilities, effectively improving the biomimetic tortoise shell protective door's ability to resist continuous penetration and damage; the soft and hard laminated structure design of the steel spherical shell panel and the shear thickening fluid gives the protective structure excellent impact resistance and a high impact energy absorption ratio. Optionally, Q960 quenched and tempered steel has excellent processing performance, and can be bent and cut, which can meet the welding requirements of large structural parts. Quenching and tempering can greatly adjust the properties and material of steel, and its strength, plasticity and toughness are good, with good comprehensive mechanical properties. Using Q960 quenched and tempered steel to prepare the biomimetic tortoise shell door leaf 1 and door frame 2, the biomimetic tortoise shell protective door has excellent high toughness and impact resistance.

[0049] In this embodiment, step S3 specifically includes the following steps:

[0050] S31. Place the filling hole 131 on the connecting ring 13 upward so that the air in the filling cavity 15 can be completely discharged when filling the shear thickening liquid.

[0051] S32. Pour the shear thickening fluid into the filling cavity 15;

[0052] S33, the injection hole 131 is soldered and encapsulated through the encapsulation structure 132.

[0053] In this embodiment, the shear thickening fluid injected in step S3 includes a dispersed phase and a dispersion medium. The mass fraction of the dispersed phase in the shear thickening fluid is 45-55%, and the dispersed phase consists of silica with an average particle size of 40-60 nm and zirconium dioxide with an average particle size of 40-60 nm. The mass ratio of zirconium dioxide to silica in the dispersed phase is 1:1. The dispersion medium is polyethylene glycol with an average molecular weight of 380-420 g / mol. Hydrophilic fumed silica nanoparticles are selected as the dispersed phase, which consists of spherical primary particles with a particle size of 50 nm. Zirconium dioxide particles with a particle size of 50 nm are used to modify the silicon-based shear thickening fluid. The ratio of zirconium dioxide to silica is 1:1. Nano-zirconia enables the shear thickening fluid to exhibit significant energy dissipation performance in high-stress ranges. Polyethylene glycol (PEG) with an average molecular weight of 400 is used as the dispersion medium. At this molecular weight, PEG is less likely to form hydrogen bonds with nano-silica particles per unit volume. With a large number of nanoparticles unconstrained by hydrogen bonds, the probability of particle collisions increases, enhancing the thickening effect. The mass fraction of the dispersed phase (the sum of the weights of hydrophilic vapor-phase nano-silica and nano-zirconia metal particles) in the shear thickening fluid is 50%. At this mass fraction, the shear thickening fluid exhibits both good fluidity and a good thickening effect.

[0054] When preparing the shear-thickening fluid, first weigh out the required amounts of each raw material by mass percentage. Pour polyethylene glycol 400 into a container and place the container under a stirrer. Add the hydrophilic vapor-phase nano-silica and nano-zirconia particles mixed dispersion phase in small batches to the container containing polyethylene glycol 400, and turn on the stirrer to stir continuously until homogeneous before adding the next batch. During the later addition of silica, as the mass fraction increases, the stirring resistance continuously increases. At this point, add polyethylene glycol in small batches until the dispersed phase is completely dissolved in polyethylene glycol 400. Store in a sealed storage container.

[0055] In this embodiment, the door frame 2 prepared in S1 undergoes galvanizing surface treatment to improve the corrosion resistance and aesthetics of the door frame 2.

[0056] The biomimetic tortoise shell door panel 1 prepared in step S2 is subjected to galvanizing surface treatment. This improves the corrosion resistance and aesthetics of the door panel 1 frame.

[0057] The biomimetic tortoise shell door panel 1 structure of this invention effectively guides the impact force to be evenly distributed when the protective door is subjected to strong impact, making the overall force on the protective door more uniform and conducive to the uniform dissipation of energy, thus effectively enhancing the strength of the protective door in civil defense projects. The shear thickening fluid filled inside the biomimetic tortoise shell door panel 1 improves the impact resistance of the overall structure through impact toughness when subjected to impact, and has recovery ability, effectively improving the protective door's ability to resist continuous penetration damage. The soft and hard laminated structure design of the steel spherical shell panel and the shear thickening fluid ensures that the protective structure has excellent performance in terms of impact resistance and high impact energy absorption ratio.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A biomimetic tortoise shell protective door, characterized in that, It includes a biomimetic tortoise shell door panel (1), a door frame (2), and a hinge (3) for connecting the biomimetic tortoise shell door panel (1) and the door frame (2). The biomimetic tortoise shell door panel (1) includes an outer spherical shell panel (11) for connecting the hinge (3), an inner spherical shell panel (12) concentrically arranged with the outer spherical shell panel (11), a connecting ring (13) for connecting the outer spherical shell panel (11) and the inner spherical shell panel (12), and a biomimetic tortoise shell sandwich panel (14) arranged between the outer spherical shell panel (11) and the inner spherical shell panel (12). The outer spherical shell panel (11), the inner spherical shell panel (12), and the connecting ring (13) form a cavity. The biomimetic turtle shell sandwich panel (14) divides the cavity into multiple filling cavities (15). A buffer energy-absorbing layer (16) is arranged inside each filling cavity (15). The connecting ring (13) is provided with injection holes (131) and a sealing structure (132) for sealing the injection holes (131). The biomimetic turtle shell sandwich panel (14) includes a regular polygonal frame (141) and a connecting plate (142) for connecting the vertices of the regular polygonal frame (141) to the connecting ring (13). The projection of the connecting plate (142) onto the radial plane of the connecting ring (13) is arranged radially along the connecting ring (13). The regular polygonal frame (141) includes a central frame (1411) and peripheral frames closely arranged around the central frame (1411). The vertices of the peripheral frames are connected to the connecting ring (13) through the connecting plate (142). The door frame (2) includes a frame plate (21) for connecting to the wall and a vertical plate (22) supported by the frame plate (21), the vertical plate (22) having a door opening adapted to the biomimetic tortoise shell door leaf (1).

2. The biomimetic turtle shell protective door according to claim 1, characterized in that, Angle support members (143) are provided at the connection end between the connecting plate (142) and the connecting ring (13).

3. The biomimetic tortoise shell protective door according to claim 1, characterized in that, The biomimetic turtle shell sandwich panel (14) has through holes (144) for connecting two adjacent filling cavities (15).

4. A method for preparing a biomimetic tortoise shell protective door, characterized in that, The method for preparing the biomimetic tortoise shell protective door according to any one of claims 1 to 3 includes the following steps: S1. Prepare the door frame (2). Obtain the frame plate (21) and the upright plate (22) by stamping and flame cutting of steel. Weld two adjacent frame plates (21) together. Weld the frame plate (21) and the upright plate (22) together. S2. Prepare a biomimetic tortoise shell door panel (1). Obtain an outer spherical shell panel (11) and an inner spherical shell panel (12) by stamping and bending steel. Obtain an integral structure of a biomimetic tortoise shell sandwich panel (14) and a connecting ring (13) by stamping, bending and flame cutting steel. Weld the connecting ring (13) and the biomimetic tortoise shell sandwich panel (14) to the outer spherical shell panel (11) respectively, and weld the inner spherical shell panel (12) to the connecting ring (13). S3. Inject shear thickening fluid into the filling cavity (15) to form a buffer energy-absorbing layer (16); S4. Weld the hinge (3) to the bionic tortoise shell door leaf (1); place the door frame (2) horizontally on the ground and weld the hinge (3) connected to the bionic tortoise shell door leaf (1) to the door frame (2).

5. The method for preparing the biomimetic tortoise shell protective door according to claim 4, characterized in that, Step S3 specifically includes the following steps: S31. Place the injection hole (131) on the connecting ring (13) facing upwards; S32. Pour the shear thickening fluid into the filling cavity (15); S33, the injection hole (131) is soldered and encapsulated through the encapsulation structure (132).

6. The method for preparing the biomimetic tortoise shell protective door according to claim 4, characterized in that, The shear thickening fluid injected in step S3 comprises a dispersed phase and a dispersion medium, wherein the mass fraction of the dispersed phase in the shear thickening fluid is 45-55%. The dispersed phase consists of silica with an average particle size of 40–60 nm and zirconium dioxide with an average particle size of 40–60 nm, with a zirconium dioxide to silica mass ratio of 1:

1. The dispersion medium is polyethylene glycol with an average molecular weight of 380–420 g / mol.

7. The method for preparing the biomimetic tortoise shell protective door according to claim 4, characterized in that, The door frame (2) prepared in step S1 and / or the biomimetic tortoise shell door leaf (1) prepared in step S2 are subjected to galvanizing surface treatment.

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