L-shaped basic part, octahedral unit cell configuration and discrete assembly mechanical superstructure

Abstract

The invention discloses an L-shaped basic piece, octahedral unit cell configuration and discrete assembly mechanical superstructure, and relates to the technical field of mechanical superstructures, the L-shaped basic piece comprises an L-shaped rod piece body, the corner of the L-shaped rod piece body is a right angle, and the L-shaped rod piece body forms a rod body middle circular bead structure and a rod body end circular bead structure; and the rod body middle shoulder structures and the rod body end shoulder structures corresponding to the six L-shaped rod piece bodies are connected to form an octahedral unit cell configuration body. By adopting the octahedral unit cell configuration, a plurality of octahedral unit cell configuration bodies are mutually connected to form a three-dimensional matrix structure. Three different splicing structures are provided according to different connection forms. The discrete unit cell parts can be prepared on a large scale, the production cost is effectively reduced, the limitation of the machining process and the machining size is further eliminated through the discrete assembly mode, and the problems that the large lattice superstructure cannot be prepared through the integrated forming technology, and discrete assembly parts are complex in structure and troublesome to assemble are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical superstructures, and in particular to a discrete assembly multi-mode mechanical superstructure, and more particularly to an L-shaped basic component and an octahedral unit cell configuration and a discrete assembly mechanical superstructure. Background Art

[0002] As the scale of large space structures such as large space communication antennas, large-aperture infrared telescopes, and space solar power stations continues to expand, the mode of launching components multiple times and assembling them on orbit has shortcomings such as time-consuming, high cost, and poor reliability. The development of space manufacturing technology will achieve a strategic shift from "making on the ground and using it in the sky" to "making in the sky and using it in the sky." How to achieve rapid batch preparation of large-scale, highly reliable space structures is an important issue facing current space manufacturing.

[0003] Mechanical superstructures have excellent mechanical properties such as low density, high specific strength and high specific stiffness. They are currently considered the most promising new generation of advanced lightweight and ultra-tough materials in the world. At the same time, their large void ratio makes it easier to achieve integrated design of load bearing and damping, thermal control and energy absorption, and have broad application prospects in aerospace, marine vessels and other fields. Mechanical superstructures are expected to help space manufacturing achieve a strategic shift from "made on earth and used in the sky" to "made in the sky and used in the sky".

[0004] Mechanical lattice superstructures have excellent mechanical properties, but they still cannot meet the needs of space manufacturing due to complex geometric structures, difficulty in preparing large structures, and time-consuming one-piece molding. At the same time, if a one-piece mechanical superstructure is partially damaged, the entire structure needs to be replaced, and the production and maintenance costs are too high.

[0005] In summary, how to use the discrete assembly design of mechanical lattice superstructures to make full use of space resources, realize the rapid batch production of large-scale space structures, and reduce their maintenance costs is the key problem in realizing the strategic shift of space manufacturing from "making on the earth and using in the sky" to "making in the sky and using in the sky". Summary of the invention

[0006] In view of this, the present invention provides an L-shaped basic component, an octahedral unit cell configuration and a discrete assembly mechanical superstructure, aiming to solve the above technical problems.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] An L-shaped basic member, comprising an L-shaped rod body:

[0009] The corner of the L-shaped rod body is a right angle, and the chamfered angle at the right angle corner forms a right-angle transition section; the upper and lower surfaces of the right-angle transition section are formed with a middle rod body embedding notch, and the middle rod body embedding notch and the stepped parts on both sides thereof form a middle rod body shoulder structure, and rod body end embedding notches are formed at both ends of the L-shaped rod body, and the opening directions of the rod body end embedding notches at both ends of the L-shaped rod body are the same, and the rod body end embedding notch and the stepped part close to the L-shaped rod body form a rod body end shoulder structure.

[0010] Preferably, in the above-mentioned L-shaped basic component, the shoulder structure in the middle of the rod body, the shoulder structure at the end of the rod body and the rod body of the L-shaped rod body are all provided with mounting holes.

[0011] Preferably, in the above-mentioned L-shaped basic component, the shoulder thicknesses of the middle shoulder structure of the rod body and the shoulder structure of the end of the rod body are equal, and are both one third of the thickness of the root of the shoulder.

[0012] The present invention also provides an octahedral unit cell configuration: 6 of the above-mentioned L-shaped basic parts are used for assembly: assuming that a cube model is established in a three-dimensional space, and 6 of the L-shaped rod body bodies are placed in the cube model, so that the middle shoulder structures of the rod bodies of the 6 L-shaped rod body bodies are respectively located at the center points of the 6 faces of the cube model, and the two end shoulder structures of the rod body of each L-shaped rod body are respectively located at the center points of two opposite faces of the cube model, and the rod bodies of the 6 L-shaped rod body bodies do not overlap with each other, and the middle shoulder structures of the rod body and the end shoulder structures of the rod body corresponding to the center points of the 6 faces of the cube model are connected to form an octahedral unit cell configuration body.

[0013] Preferably, in the above-mentioned octahedral unit cell configuration, the middle shoulder structure of each L-shaped rod body is clamped between the end shoulder structures of the two connected L-shaped rod bodies.

[0014] Preferably, in the above-mentioned octahedral unit cell configuration, the interconnected middle shoulder structure of the rod body and the end shoulder structure of the rod body are connected by unit cell connecting bolts.

[0015] Preferably, in the above-mentioned octahedral unit cell configuration, the thickness t of the L-shaped rod body is 1 / 35 to 1 / 15 of the outer length dimension of the octahedral unit cell configuration body; and the thickness of the shoulder is 0.75t to 1.5t.

[0016] The present invention also provides a discrete assembly mechanical superstructure: using the above-mentioned octahedral unit cell configuration, a plurality of the octahedral unit cell configuration bodies are connected to each other to form a three-dimensional matrix structure.

[0017] Preferably, in the above-mentioned discrete assembly mechanical superstructure, for the connection relationship between the multiple octahedral unit cell configuration bodies in the same layer: adjacent octahedral unit cell configuration bodies are connected through the position of the flat angle transition section of the L-shaped rod body; or, adjacent octahedral unit cell configuration bodies are connected through the rod body of the L-shaped rod body.

[0018] Preferably, in the above-mentioned discrete assembly mechanical superstructure, for the connection relationship between the multiple octahedral unit cell configuration bodies of two adjacent layers above and below: the upper and lower adjacent octahedral unit cell configuration bodies are connected through the position of the flat angle transition section of the L-shaped rod body; or, an additional octahedral unit cell configuration body is provided between the upper and lower adjacent octahedral unit cell configuration bodies, and is connected with the rod bodies of other adjacent L-shaped rod bodies through the rod body of the additionally provided L-shaped rod body.

[0019] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses an L-shaped basic component, an octahedral unit cell configuration and a discrete assembly mechanical superstructure, which has the following beneficial effects:

[0020] 1. The present invention designs a new type of discrete assembly mechanical superstructure. The superstructure unit cell is composed of a basic part, and the assembly structure only contains two components, an L-shaped basic part and a bolt group of the same specification. According to the design idea of ​​discrete-assembly, the unit cell is discretized into completely identical basic parts, which are connected and assembled through mortise and tenon structures and bolt groups to form a complete lattice unit cell.

[0021] 2. Compared with the one-piece lattice structure, the present invention can realize the preparation of large-scale lattice structures and has extremely strong repairability. If a unit cell is damaged, it can be quickly replaced and its original mechanical properties can be restored. Compared with other non-one-piece lattice structures, this invention uses a single basic part, which can be assembled flexibly, reducing the scale and technical requirements of space additive manufacturing equipment, making manufacturing more flexible and the assembly process more streamlined.

[0022] 3. The discrete unit cells designed by the present invention can be designed with unit cells of different sizes to form mechanical superstructures of arbitrary sizes and shapes. The limitation of the manufacturing volume of the preparation equipment itself is avoided, and the preparation of large-scale structures of centimeters and meters can be realized. The limitation of the small size of the one-piece molded lattice structure is overcome. According to different space equipment and its performance requirements, the prepared standardized discrete structure can be customized and adjustable in performance according to the matrix material, the topological configuration of the component cell and the assembly scale.

[0023] 4. The present invention can use materials with different thermal expansion coefficients to prepare unit components. Through a certain assembly sequence, negative thermal expansion characteristics can be achieved to form a negative thermal expansion superlattice structure.

[0024] 5. The present invention proposes a method for producing large-scale lattice structures by discrete assembly of basic parts for modular and mass production, and proposes a set of simple, low-cost and highly repeatable preparation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 The accompanying drawing is a schematic diagram of the structure of the L-shaped rod body provided by the present invention;

[0027] Figure 2 The accompanying drawing is a front dimensional diagram of the L-shaped rod body provided by the present invention;

[0028] Figure 3 The accompanying drawing is a top view of the L-shaped rod body provided by the present invention;

[0029] Figure 4 The accompanying drawing is a side dimensional diagram of the L-shaped rod body provided by the present invention;

[0030] Figure 5 The accompanying drawing is a schematic diagram of assembling the L-shaped rod body provided by the present invention;

[0031] Figure 6 The accompanying drawing is a schematic diagram of the main structure of the octahedral unit cell configuration provided by the present invention;

[0032] Figure 7 The accompanying drawing is a schematic diagram of the assembly structure of two discretely assembled superstructure unit cells in Example 1 of the present invention;

[0033] Figure 8 The accompanying drawings are Figure 7 Partial cross-sectional view of the assembly of two discretely assembled superstructure unit cells;

[0034] Fig. 9 The accompanying drawing is a schematic diagram of a 2×2×2 order discrete assembly superstructure in Example 1 of the present invention;

[0035] Fig.10 The accompanying drawing is a schematic diagram of a 4×4×4 order discrete assembly superstructure in Example 1 of the present invention;

[0036] Fig.11 The accompanying drawing is a schematic diagram of the assembly structure of two discretely assembled superstructure unit cells in Example 2 of the present invention;

[0037] Fig.12 The accompanying drawings are Fig.11 Partial cross-sectional view of the assembly of two discretely assembled superstructure unit cells;

[0038] Fig.13 The accompanying drawing is a schematic diagram of a 2×2×2 order discrete assembly superstructure in Example 2 of the present invention;

[0039] Fig.14 The accompanying drawing is a schematic diagram of a 4×4×4 order discrete assembly superstructure in Example 2 of the present invention;

[0040] Fig.15 The accompanying drawing is a schematic diagram of a 2×2×2 order discrete assembly superstructure in Example 3 of the present invention;

[0041] Fig.16 The accompanying drawing is a schematic diagram of a 4×4×4 order discrete assembly superstructure in Example 3 of the present invention;

[0042] Fig.17 The accompanying drawing is a schematic diagram of the axial compression load and constraint setting of the finite element analysis in Example 4 of the present invention;

[0043] Fig.18 The accompanying drawing is a schematic diagram of a force displacement curve of a unit cell in Example 4 of the present invention;

[0044] Fig.19 The accompanying drawing is a stress cloud diagram of a unit cell at peak load in Example 4 of the present invention;

[0045] Fig. 20 The accompanying drawing is a schematic diagram of a force-displacement curve of a 2×2×2 order discrete assembly superstructure in Example 4 of the present invention;

[0046] Fig.21 The attached figure is a stress cloud diagram of the 2×2×2-order structure under peak load in Example 4 of the present invention.

[0047] in:

[0048] 1-L-shaped rod body 1; 2-L-shaped rod body 2; 3-L-shaped rod body 3; 4-L-shaped rod body 4; 5-L-shaped rod body 5; 6-L-shaped rod body 6;

[0049] 10-L-shaped rod body; 101-through hole one; 102-through hole two; 103-through hole three; 104-through hole four; 105-through hole five; 106-through hole six; 107-through hole seven; 108-shoulder structure in the middle of the rod body; 109-shoulder structure at the end of the rod body;

[0050] 201-unit cell connection bolt; 202-structure connection bolt;

[0051] 301-octahedral unit cell configuration entity. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] See attached Figure 1 The embodiment of the present invention discloses an L-shaped basic member, including an L-shaped rod body 10:

[0054] The corner of the L-shaped rod body 10 is a right angle, and the chamfered angle at the right angle corner forms a right-angle transition section; the upper and lower surfaces of the right-angle transition section are formed with a middle rod body embedding notch, and the middle rod body embedding notch and the stepped parts on both sides thereof form a middle rod body shoulder structure 108, and rod body end embedding notches are formed at both ends of the L-shaped rod body 10. The opening directions of the rod body end embedding notches at both ends of the L-shaped rod body 10 are the same, and the rod body end embedding notch and the stepped parts close to the L-shaped rod body 10 form a rod body end shoulder structure 109.

[0055] In order to further optimize the above technical solution, mounting holes are provided on the middle shoulder structure 108 of the rod body, the end shoulder structure 109 of the rod body, and the rod body of the L-shaped rod body 10. Specifically, the L-shaped rod body 10 has 7 mounting holes, through hole 101 and through hole 3 103 are respectively located on the two end shoulder structures 109 of the rod body, through hole 2 102 is located on the middle shoulder structure 108 of the rod body, through hole 4 104 and through hole 5 105 are located on the same long side, and through hole 6 106 and through hole 7 107 are located on the other long side.

[0056] In order to further optimize the above technical solution, the shoulder thicknesses of the middle shoulder structure 108 of the rod body and the shoulder structure 109 at the end of the rod body are equal, and are both one third of the thickness of the root of the shoulder.

[0057] See attached Figure 5 and attached Figure 6The embodiment of the present invention further discloses an octahedral unit cell configuration, which is assembled using six of the above-mentioned L-shaped basic parts: assuming that a cube model is established in a three-dimensional space, and six L-shaped rod bodies 10 are placed in the cube model, so that the middle shoulder structures 108 of the six L-shaped rod bodies 10 are respectively located at the center points of the six faces of the cube model, and the two rod end shoulder structures 109 of each L-shaped rod body 10 are respectively located at the center points of two opposite faces of the cube model, and the rods of the six L-shaped rod bodies 10 do not overlap each other, and the middle shoulder structures 108 and the rod end shoulder structures 109 corresponding to the center points of the six faces of the cube model are connected to form an octahedral unit cell configuration body 301.

[0058] like Figure 5 As shown, each vertex of the octahedral unit cell configuration body 301 is assembled in sequence by the shoulder structures of three L-shaped rod bodies 10 according to the mortise and tenon principle. The entire octahedral unit cell configuration body 301 is assembled in sequence by six L-shaped rod bodies 10 to form a closed loop, thereby forming a complete octahedral basic unit cell and a complete discrete assembly superstructure unit cell.

[0059] In order to further optimize the above technical solution, the middle shoulder structure 108 of each L-shaped rod body 10 is clamped between the end shoulder structures 109 of the two connected L-shaped rod bodies 10 .

[0060] In order to further optimize the above technical solution, the interconnected rod body middle shoulder structure 108 and the rod body end shoulder structure 109 are connected by a unit cell connecting bolt 201.

[0061] See attached Figure 2 To Attachment Figure 4 The thickness t of the L-shaped rod body 10 is 1 / 35 to 1 / 15 of the outer length of the octahedral unit cell configuration body 301; the shoulder thickness b is 0.75t to 1.5t, and the thickness of the shoulder root is 3b. The diameter of the mounting hole is d, the through hole size is generally 1.1 times the outer diameter of the standard bolt, the short side thickness W is generally 2.5d to 5d of the mounting hole diameter, the shoulder size is W×W mm, and the distance between the upper and lower ends of the shoulder of the middle shoulder structure 108 of the rod body is the same as b.

[0062] like Figure 3 As shown in , L is the projected length of the L-shaped rod body 10 in a top view.

[0063] The size of the shoulder is generally determined according to the size of the designed octahedral unit cell configuration body 301 and the size of the bolt, which is generally 2.5d-3d, and the thickness of the shoulder is generally 1 / 2t-4 / 5t.

[0064] The unit cell based on the L-shaped rod body 10 can form a variety of different superstructure configurations:

[0065] Configuration 1 uses the mounting holes on the shoulders of the L-shaped rod body 10 to splice the unit cells, and uses the structural connection 202 to achieve the connection between the unit cells. The unit cells are assembled using unit cell connection bolts 201. Through assembly, a mechanical lattice superstructure of BCC configuration can be formed.

[0066] Configuration 2 uses the mounting holes on the long sides of the unit cells to connect the unit cells, and adopts the connection method of configuration 1 in the direction perpendicular to the long side connection. Configuration 2 uses two assembly methods to achieve expansion in different directions, and proposes a new production and preparation method for anisotropic superstructures.

[0067] Configuration 3 uses the mounting holes on the rod body of the L-shaped rod body 10 to assemble the unit cells, and introduces an additional octahedral unit cell configuration body 301. The mounting holes on the long sides of the additional octahedral unit cell configuration body 301 are used to connect the upper and lower layers of unit cells, thereby replacing the long bolt connection in configuration 2 to achieve the connection between long sides in any direction. The mechanical lattice superstructure of the Octet configuration can be formed by assembly, and the bolts are connected using standard parts.

[0068] The L-shaped rod body 10 is connected by mortise and tenon assembly and bolt groups to form a complete unit cell. Multiple lattice unit cells can be periodically assembled and connected by bolt groups. Discrete unit cell parts can be mass-produced using traditional production processes, which effectively reduces production costs. The discrete assembly method also further eliminates the limitations of processing technology and processing size. In addition, compared with other discrete assembly structures, the designed discrete assembly lattice structure consists of a single basic part, which achieves faster mass production and better repairability. The lattice structure has scalability, versatility, and high reliability.

[0069] The superstructures of discrete assembly design of Configuration 1, Configuration 2 and Configuration 3 can achieve many advantages such as low density, high reliability, repairability, high load-bearing capacity, impact resistance, and easy deployment. The material properties, topological configurations and dimensional parameters of discrete component units can be customized according to different space demand scenarios and payload missions.

[0070] The unit cell is assembled by assembling six L-shaped rod bodies 10 made of different materials to form a multi-material superlattice structure.

[0071] The unit cell volume fraction of the discrete assembly mechanics superstructure can be adjusted by changing the parameters such as L, W, t, etc. of the L-shaped rod body 10 and controlled within the range of 4% to 15%.

[0072] Embodiment 1:

[0073] See also Figure 7-10 In order to realize the production and preparation of large-scale discrete assembly superstructures and expansion in all directions, the unit cells can be connected by assembly, thereby realizing expansion in any size and in any direction.

[0074] Specifically, the unit cell connection bolts 201 are replaced by long structural connection bolts 202, so that two units are assembled together by the long bolts. Figure 7 and Figure 8 shown.

[0075] Through the above method, multiple cells are assembled in three mutually perpendicular directions, such as Fig. 9 As shown. This further enables expansion in any size and direction. Fig.10 This is the first 4×4×4 order discrete assembly superstructure given by the present invention.

[0076] Embodiment 2:

[0077] See also Figure 11-14 ,In order to adapt to different load-bearing requirements and meet different ,performance requirements, the connection between long sides is introduced here to replace the ,connection between some vertices and vertices, and a second assembly method is proposed to ,improve its load-bearing performance.

[0078] On the basis of Example 1, the mounting holes on the long sides are used to achieve the connection between the long sides of the unit cell and the long sides of the adjacent unit cells, such as Fig.11 and Fig.12 shown.

[0079] According to the above method, the plane where the long side is connected to the adjacent side is connected, and the long bolts in Example 1 are used in the vertical direction to achieve expansion in three directions, such as Fig.13 Due to the different extension connection methods in the three directions, the proposed second splicing method can show different mechanical properties in different directions, which can meet the specific needs of some engineering projects and propose a new production method and preparation method for anisotropic discrete assembly superstructures.

[0080] Two assembly methods were used to achieve expansion in different directions, and a new production and preparation method for anisotropic superstructures was proposed. Fig.14 This is the second 4×4×4 order discrete assembly superstructure provided by the present invention.

[0081] Embodiment 3:

[0082] See also Figure 15-16In order to further improve the bearing capacity of the structure and achieve the characteristics of light weight, high load-bearing capacity, impact resistance, and easy deployment, the present invention further proposes a third assembly method. The connection relationship between all unit cells is assembled using the installation holes on the long sides. This method is used to further improve the bearing capacity of the structure.

[0083] As in the connection method adopted in Example 2, the mounting holes on the long sides are used to achieve the connection between the long sides of a single cell and the long sides of an adjacent single cell.

[0084] In the direction perpendicular to the above connection, another unit cell is introduced here to connect the unit cells in the vertical direction, and the mounting holes on the long sides of the additional octahedral unit cell configuration body 301 are used to connect the upper and lower layers of unit cells, thereby replacing the long bolt connection in Example 1 to achieve the connection between the long sides in any direction, such as Fig.15 shown. Fig.16 This is the third 4×4×4 order discrete assembly superstructure proposed by the present invention.

[0085] Embodiment 4:

[0086] See also Figure 17-19 In order to further illustrate the mechanical bearing performance of the superstructure based on discrete assembly of L-shaped basic parts, finite element analysis was performed on the regular octahedral unit cell composed of the L-shaped rod body 10 and the first 2×2×2 order unit cell.

[0087] In the finite element analysis, the given dimensions of the structure are L = 93.9 mm, W = 5 mm, the unit cell volume fraction based on the L-shaped rod body 10 is about 4.9%, and the material of the structure is defined as 316 stainless steel with a density of 7980 kg / m 3 , elastic modulus is 206GPa, and Poisson's ratio is 0.3.

[0088] Fig.17 These are the axial compression and boundary conditions of the regular octahedron unit cell during finite element analysis. The axial compression is applied to the upper surface of the unit cell, the axial compression displacement is 10 mm, and the clamped constraint is applied to the lower surface of the unit cell.

[0089] Furthermore, the unit cell force-displacement curve is plotted, such as Fig.18 As shown in the figure, through finite element analysis, during the compression process of the unit cell, the support reaction force shows a trend of first increasing and then decreasing. Fig.19 It is the stress nephogram corresponding to the peak load.

[0090] Furthermore, a finite element analysis is performed on the 2×2×2 order discrete assembly superstructure in Example 3 to obtain a force displacement curve of the 2×2×2 order (configuration 2) discrete assembly superstructure, as shown in FIG. Fig. 20 shown. Fig.21 It is the stress cloud diagram corresponding to the peak value of the force-displacement curve.

[0091] In summary, the superstructure designed by the present invention based on discrete assembly of L-shaped basic parts has the characteristics and performance of light weight, high load-bearing capacity, impact resistance, and easy deployment.

[0092] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0093] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An L-shaped basic member, comprising an L-shaped rod body (10); characterized in that: The corner of the L-shaped rod body (10) is a right angle, and the right angle corner is chamfered to form a right angle transition section; the upper and lower surfaces of the right angle transition section are both formed with a rod body middle mounting notch, the rod body middle mounting notch and the stepped portions on both sides thereof form a rod body middle shoulder structure (108), and rod body end mounting notches are formed at both ends of the L-shaped rod body (10), the rod body end mounting notches at both ends of the L-shaped rod body (10) are opened in the same direction, and the rod body end mounting notch and the stepped portion close to the L-shaped rod body (10) form a rod body end shoulder structure (109).

2. An L-shaped basic member according to claim 1, characterized in that: The middle shoulder structure (108) of the rod body, the end shoulder structure (109) of the rod body and the rod body of the L-shaped rod member body (10) are all provided with mounting holes.

3. An L-shaped basic member according to claim 1, characterized in that: The shoulder thicknesses of the middle shoulder structure (108) of the rod body and the shoulder structure (109) at the end of the rod body are equal, and are both one third of the thickness of the root of the shoulder.

4. An octahedral unit cell configuration, characterized in that: An L-shaped basic component according to any one of claims 1 to 3 is used for assembly: assuming that a cube model is established in a three-dimensional space, and six L-shaped rod bodies (10) are placed in the cube model, so that the middle shoulder structures (108) of the six L-shaped rod bodies (10) are respectively located at the center points of the six faces of the cube model, and the two end shoulder structures (109) of each L-shaped rod body (10) are respectively located at the center points of two opposite faces of the cube model, and the rods of the six L-shaped rod bodies (10) do not overlap each other, and the middle shoulder structures (108) and the end shoulder structures (109) corresponding to the center points of the six faces of the cube model are connected to form an octahedral unit cell configuration body (301).

5. An octahedral unit cell configuration according to claim 4, characterized in that: The middle shoulder structure (108) of each L-shaped rod body (10) is clamped between the end shoulder structures (109) of the two connected L-shaped rod bodies (10).

6. An octahedral unit cell configuration according to claim 4, characterized in that: The rod body middle shoulder structure (108) and the rod body end shoulder structure (109) that are connected to each other are connected via a unit cell connection bolt (201).

7. An octahedral unit cell configuration according to claim 4, characterized in that: The thickness t of the L-shaped rod body (10) is 1 / 35 to 1 / 15 of the outer length dimension of the octahedral unit cell configuration body (301); and the thickness of the shoulder is 0.75t to 1.5t.

8. A discrete assembly mechanical superstructure, characterized in that: An octahedral unit cell configuration as described in any one of claims 4 to 7 is adopted, and a plurality of said octahedral unit cell configuration bodies (301) are connected to each other to form a three-dimensional matrix structure.

9. A discrete assembly mechanical superstructure according to claim 8, characterized in that: Regarding the connection relationship between the multiple octahedral unit cell configuration bodies (301) in the same layer: the adjacent octahedral unit cell configuration bodies (301) are connected through the positions of the flat angle transition sections of the L-shaped rod body (10); or, the adjacent octahedral unit cell configuration bodies (301) are connected through the rod bodies of the L-shaped rod body (10).

10. A discrete assembly mechanical superstructure according to claim 9, characterized in that: Regarding the connection relationship between the plurality of octahedral unit cell configuration bodies (301) in two adjacent layers: the octahedral unit cell configuration bodies (301) adjacent to each other are connected via the position of the flat angle transition section of the L-shaped rod body (10); or, an additional octahedral unit cell configuration body (301) is provided between the octahedral unit cell configuration bodies (301) adjacent to each other, and is connected to the rod bodies of other adjacent L-shaped rod bodies (10) via the rod body of the additionally provided L-shaped rod body (10).

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