CN111442178A - Lightweight load-bearing structure - Google Patents
Lightweight load-bearing structure Download PDFInfo
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- CN111442178A CN111442178A CN202010258986.8A CN202010258986A CN111442178A CN 111442178 A CN111442178 A CN 111442178A CN 202010258986 A CN202010258986 A CN 202010258986A CN 111442178 A CN111442178 A CN 111442178A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
- F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
- F16S3/06—Assemblies of elongated members
- F16S3/08—Assemblies of elongated members forming frameworks, e.g. gratings
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Abstract
A light-weight bearing structure is characterized by being a multilayer structure consisting of a plurality of bearing units, wherein one bearing unit is of a structure comprising 4 supporting rods with the same shape and a node A, one ends of the 4 supporting rods are connected together without a gap to form the node A, the other ends of the 4 small supporting rods are four vertexes of a square with the composition edge being L, a plane formed by the four vertexes of the square is called a bottom M of the bearing unit, and the distance from the node A to the bottom of the bearing unit is the height h of the bearing unit.
Description
Technical Field
The invention relates to a bearing structure, in particular to a material-saving light-weight bearing structure.
Background
The lattice structure has the excellent characteristics of light weight, high specific stiffness, high specific strength, sound absorption, heat insulation and the like, is considered as the best choice for structure lightweight, and has more and more applications in the fields of automobiles, ships and aerospace. The gradient lattice structure enables the whole structure to have better performance through the design of the lattice unit cell configuration.
The existing lightweight load-bearing structure controls the relative density of the single cell rod pieces by changing the thickness of the single cell rod pieces in each layer of lattice, improves the shock resistance of the structure, and achieves the purpose that macroscopic physical property parameters of the lattice structure are changed in a gradient manner along with the spatial position, and the connection between layers is realized by adding a partition plate or a transition layer. However, when the layers are connected by adding the partition plates, a part of the partition plates are suspended, which is not beneficial to the realization of additive manufacturing, and the existing processing mode is time-consuming and labor-consuming; when the connection between layers is realized by adding the transition layer, a larger connection step is easy to appear between the upper layer lattice structure and the lower layer lattice structure.
Disclosure of Invention
The invention aims to provide a light-weight bearing structure to overcome the defects of poor bearing effect and labor-consuming processing in the prior art.
The light weight bearing structure is characterized by comprising a multilayer structure consisting of a plurality of bearing units, wherein one bearing unit has a structure comprising 4 small support rods with the same shape and a node A, one ends of the 4 small support rods are connected together without a gap to form the node A, the other ends of the 4 small support rods are four vertexes of a square with the composition edge being L, a plane formed by the four vertexes of the square is called a bottom M of the bearing unit, and the distance from the node A to the bottom of the bearing unit is the height h of the bearing unit;
the bearing units are connected in the vertical direction, wherein the node A1 of the first bearing unit is below the bottom M1 of the first bearing unit, the node A2 of the second bearing unit is above the bottom M2 of the second bearing unit, the node A1 of the first bearing unit and the node A2 of the second bearing unit are connected together in a seamless mode to form a node, and the bottom M2 of the second bearing unit is parallel to the bottom M1 of the first bearing unit;
the node A3 of the third bearing unit is arranged below the bottom M3 of the third bearing unit, and the other ends of the 4 small supporting rods of the third bearing unit are seamlessly connected with the other ends of the 4 small supporting rods of the second bearing unit one by one, so that the bottom M3 of the third bearing unit is superposed with the bottom M2 of the second bearing unit;
the fourth bearing unit is connected with the node of the third bearing unit to form a node; the connection mode of the first bearing unit and the second bearing unit is the same as that of the first bearing unit; forming N layers by the analogy;
the first bearing unit, the second bearing unit, the third bearing unit, … and the Nth bearing unit respectively extend to the periphery in the horizontal direction; each layer is formed by a plurality of bearing units to form an array, and the bottoms of the plurality of bearing units of each layer are in the same plane; the other end of one small supporting rod of each bearing unit is connected with the other end of each small supporting rod of 3 adjacent bearing units on the same layer, and is connected with the other end of each small supporting rod of 4 bearing units on the layer superposed with the bottom of the bearing unit;
wherein the height of the load bearing units of the same layer is the same and the square side length L of the bottom of all the load bearing units is the same.
The small supporting rods of the bearing units are cylinders or round tables, and the two ends of each small supporting rod are cut into shapes capable of being connected seamlessly, so that the small supporting rods of all nodes are connected seamlessly.
The included angle α range of the small supporting rods adjacent to each bearing unit is more than or equal to 20 and less than or equal to α and less than or equal to 120.
The included angle α range of the small supporting rods adjacent to each bearing unit is more than or equal to 20 and less than or equal to α and less than or equal to 60.
The heights of the layers are the same.
The heights of the layers are different.
The diameters of the small supporting rods of all the bearing units are the same.
The diameters of the small struts of different load bearing units vary.
And a reinforcing rib is additionally arranged between the nodes of the adjacent bearing units on the same vertical line for connection.
And a layer of skin is added outside all the bearing units, and outermost nodes of all the bearing units are connected with the skin.
The invention has the beneficial effects that:
1. according to the invention, a lightweight load-bearing structure is formed by multiple layers of load-bearing unit arrays, so that the material consumption is reduced, the structure weight is reduced and the mechanical property of the structure is improved under the condition of ensuring the structural strength.
2. The invention can be formed by machining, and is particularly suitable for 3D printing and forming.
3. The array structure has a gradient function, and physical parameters of the structure on a macroscopic scale are changed in a gradient manner along with the spatial position.
4. The invention can realize the change of the sectional area size of the small supporting rod, eliminates the connecting steps between the connected supporting rods and ensures that the whole structure has more reliable performance when stressed. The size of the lightweight bearing structure can be changed at will according to design requirements, and the diameters of the large end and the small end of the small round-table-shaped supporting rod forming the lightweight bearing structure can be changed at will according to the design requirements.
5. The invention realizes the lightweight of the structure, and the structure has excellent mechanical property.
6. The invention realizes the variable density design of the structure by changing the diameter of the small strut, and the whole structure has clear force transmission path, simple configuration and convenient manufacture.
7. Under the same density, the array structure of the invention has larger gaps, and is beneficial to air flow when no skin exists and is beneficial to heat insulation when the skin exists.
8. The base length L of a single load-bearing unit of the invention is between 6 and 20 mm.
9. The sizes of all the unit bottoms are the same, so that the design of the bearing structure suitable for narrow space is facilitated.
Drawings
FIG. 1 is a schematic view of the structure of the load-bearing unit of the present invention;
FIG. 2 is a schematic view of the construction of two load carrying units of the present invention connected together in a vertical orientation;
FIG. 3 is a schematic view of the structure of the present invention with 4 load carrying units connected together in a vertical direction;
FIG. 4 is a schematic diagram of the continuation process of the load bearing unit of the present invention;
FIG. 5 is a schematic view of the present invention with 4 load carrying units connected together in a vertical orientation;
FIG. 6 is a schematic diagram of the overall structure of the present invention;
FIG. 7 is a schematic structural view showing 4 load-bearing units of the present invention connected together in the vertical direction and having reinforcing ribs between vertically adjacent nodes;
FIG. 8 is a schematic structural view of the present invention with reinforcing ribs between nodes;
fig. 9 and 8 are perspective views;
figure 10 is a schematic view of the structure of the load-bearing unit of the present invention.
Detailed Description
The light weight bearing structure is characterized by comprising a multilayer structure consisting of a plurality of bearing units, wherein one bearing unit has a structure comprising 4 small support rods with the same shape and a node A, one ends of the 4 small support rods are connected together without a gap to form the node A, the other ends of the 4 small support rods are four vertexes of a square with the composition edge being L, a plane formed by the four vertexes of the square is called a bottom M of the bearing unit, and the distance from the node A to the bottom of the bearing unit is the height h of the bearing unit;
the bearing units are connected in the vertical direction, wherein the node A1 of the first bearing unit is below the bottom M1 of the first bearing unit, the node A2 of the second bearing unit is above the bottom M2 of the second bearing unit, the node A1 of the first bearing unit and the node A2 of the second bearing unit are connected together in a seamless mode to form a node, and the bottom M2 of the second bearing unit is parallel to the bottom M1 of the first bearing unit;
the node A3 of the third bearing unit is arranged below the bottom M3 of the third bearing unit, and the other ends of the 4 small supporting rods of the third bearing unit are seamlessly connected with the other ends of the 4 small supporting rods of the second bearing unit one by one, so that the bottom M3 of the third bearing unit is superposed with the bottom M2 of the second bearing unit;
the fourth bearing unit is connected with the node of the third bearing unit to form a node; the connection mode of the first bearing unit and the second bearing unit is the same as that of the first bearing unit; forming N layers by the analogy;
the first bearing unit, the second bearing unit, the third bearing unit, … and the Nth bearing unit respectively extend to the periphery in the horizontal direction; each layer is formed by a plurality of bearing units to form an array, and the bottoms of the plurality of bearing units of each layer are in the same plane; the other end of one small supporting rod of each bearing unit is connected with the other end of each small supporting rod of 3 adjacent bearing units on the same layer, and is connected with the other end of each small supporting rod of 4 bearing units on the layer superposed with the bottom of the bearing unit;
wherein the height of the load bearing units of the same layer is the same and the square side length L of the bottom of all the load bearing units is the same.
The small supporting rods of the bearing units are cylinders or round tables, and the two ends of each small supporting rod are cut into shapes capable of being connected seamlessly, so that the small supporting rods of all nodes are connected seamlessly.
The included angle α range of the small supporting rods adjacent to each bearing unit is more than or equal to 20 and less than or equal to α and less than or equal to 120.
The included angle α of the small support rods adjacent to each bearing unit can be within the range of 20- α -60.
The heights of the layers are the same.
The heights of the layers are different.
The diameters of the small supporting rods of all the bearing units are the same.
The diameters of the small struts of different load bearing units vary.
And a reinforcing rib is additionally arranged between the nodes of the adjacent bearing units on the same vertical line for connection.
And a layer of skin is added outside all the bearing units, and outermost nodes of all the bearing units are connected with the skin.
The first embodiment is as follows:
the following examples refer to fig. 1, 2, 3, 4 and 6.
A lightweight load-bearing structure is characterized by comprising N layers of array structures and 4N circular truncated cone-shaped rods, wherein each layer of pyramid lattice structure is formed by extending load-bearing structure units in an XOY plane, unit cells of each layer of pyramid are the same in size and relative density, each lightweight load-bearing structure unit is composed of a rod 1, a rod 2, a rod 3, a rod 4 and a node 5, one ends of 4 supporting rods are connected together in a seamless manner to form a node 5, the other ends of the 4 supporting rods form four vertexes of a square with the side length of L, a plane formed by the four vertexes of the square is called a bottom M of the load-bearing unit, the distance from the node 5 to the bottom of the load-bearing unit is h, the rods 1, 2, 3 and 4 are circular truncated cone-shaped, the diameter of the large end of each rod is D, the diameter of the small end of each rod is D, and the rods 1, 2, 3 and 4 are connected through the node 5 to form the lightweight load-bearing structure unit.
The invention relates to a lightweight load-bearing structure which comprises N layers of array structures and 4N circular truncated cone-shaped rods, wherein each layer of array structure is formed by extending in an XOY plane, load-bearing units in each layer are the same and have the same relative density, the sizes of small load-bearing unit struts in different layers are different, each load-bearing unit comprises a rod 1, a rod 2, a rod 3, a rod 4 and a node 5, one ends of the 4 struts are connected together without a gap to form a node 5, the other ends of the 4 struts form four vertexes of a square with the side length of L, a plane formed by the four vertexes of the square is called the bottom M of the load-bearing unit, the distance from the node 5 to the bottom of the load-bearing unit is the height h of the load-bearing unit, the rods 1, 2, 3 and 4 are circular truncated cone-shaped, the diameter of the large end of each rod is D, the diameter of the small end of each rod 1, the rod 2, the rod 3 and the rod 4 are connected through the node 5 to.
As can be seen from FIG. 4, the array layer A and the array layer B are connected and extended integrally in two directions X, Y to form a gradient lattice structure.
The second implementation:
a lightweight load bearing structure as in the first embodiment, wherein a reinforcing bar is added between the nodes of adjacent load bearing units on the same vertical line.
And (3) implementation:
a lightweight load-bearing structure as in the first embodiment, wherein a layer of skin is added outside all load-bearing units, and outermost nodes of all load-bearing units are connected with the skin.
The invention is particularly suitable for 3D printing, the most common single load bearing unit of the invention having a base width L of 8 mm to 16 mm, in the embodiment L of 10 mm.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Those skilled in the art can make numerous changes and modifications to the disclosed embodiments, or equivalent variations, without departing from the scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the content of the technical solution of the present invention is departed from.
Claims (10)
1. The light weight bearing structure is characterized by comprising a multilayer structure consisting of a plurality of bearing units, wherein one bearing unit has a structure comprising 4 small support rods with the same shape and a node A, one ends of the 4 small support rods are connected together without a gap to form the node A, the other ends of the 4 small support rods are four vertexes of a square with the edge being L, a plane formed by the four vertexes of the square is called the bottom M of the bearing unit, and the distance from the node A to the bottom of the bearing unit is the height h of the bearing unit;
a plurality of bearing units are connected in the vertical direction, wherein the node A1 of the first bearing unit is below the bottom M1 of the first bearing unit, the node A2 of the second bearing unit is above the bottom M2 of the second bearing unit, the node A1 of the first bearing unit and the node A2 of the second bearing unit are connected together in a seamless mode to form a new node, and the bottom M2 of the second bearing unit is parallel to the bottom M1 of the first bearing unit;
the node A3 of the third bearing unit is arranged below the bottom M3 of the third bearing unit, and the other ends of the 4 small supporting rods of the third bearing unit are seamlessly connected with the other ends of the 4 small supporting rods of the second bearing unit one by one, so that the bottom M3 of the third bearing unit is superposed with the bottom M2 of the second bearing unit;
the fourth bearing unit is connected with the node of the third bearing unit to form a node; the connection mode of the first bearing unit and the second bearing unit is the same as that of the first bearing unit; forming N layers by the analogy;
the first bearing unit, the second bearing unit, the third bearing unit, … and the Nth bearing unit which are connected in the vertical direction respectively extend to the periphery in the horizontal direction; forming a plurality of layers, wherein each layer is formed by a plurality of bearing units to form an array, and the bottoms of the plurality of bearing units in each layer are in the same plane; the bottoms of the layers are parallel to each other; the other end of one small supporting rod of each bearing unit is connected with the other end of each small supporting rod of 3 adjacent bearing units on the same layer, and is connected with the other end of each small supporting rod of 4 bearing units on the layer superposed with the bottom of the bearing unit;
wherein the height of the load bearing units in the same layer is the same, and the side length L of the square of the bottom of all the load bearing units is the same.
2. The lightweight load-bearing structure according to claim 1, wherein said small struts of said load-bearing unit are cylindrical or truncated cone, and both ends of said small struts are cut into a shape capable of being seamlessly connected to each other, so that the small struts of all nodes are seamlessly connected.
3. A lightweight load bearing structure according to claim 1 or 2 wherein the angle α between adjacent minor struts of each load bearing unit is in the range 20 ≤ α ≤ 120.
4. A lightweight load bearing structure according to claim 1 or 2 wherein the angle α between adjacent minor struts of each load bearing unit is in the range 20 ≤ α ≤ 60.
5. A lightweight load bearing structure according to claim 1 or 2 or 3 or 4 wherein the height of said layers is the same.
6. A lightweight load bearing structure according to claim 1 or 2 or 3 or 4 or 5 wherein the heights of said layers are different.
7. A lightweight load bearing structure according to claim 5 or 6 wherein the diameter of the minor struts of all load bearing units is the same.
8. A lightweight load bearing structure according to claim 5 or 6 wherein the diameters of the minor struts of different load bearing units are different.
9. A lightweight load bearing structure according to claim 1 or 2 or 7 or 8 wherein a reinforcing bar is added between the nodes of adjacent load bearing units on the same vertical line.
10. A lightweight load bearing structure according to claim 1 or 2 or 7 or 8 or 9, wherein a layer of skin is applied to all load bearing elements, and outermost nodes of all load bearing elements are connected to the skin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010258986.8A CN111442178A (en) | 2020-04-03 | 2020-04-03 | Lightweight load-bearing structure |
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| CN202010258986.8A CN111442178A (en) | 2020-04-03 | 2020-04-03 | Lightweight load-bearing structure |
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Cited By (2)
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| CN112962783A (en) * | 2021-01-31 | 2021-06-15 | 肖登亮 | Bearing structure |
| CN113427850A (en) * | 2021-06-22 | 2021-09-24 | 哈尔滨工程大学 | Simply-assembled pyramid lattice sandwich structure and preparation method thereof |
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Application publication date: 20200724 |