Connecting rod coupling type pyramid lattice structure

Abstract

The connecting rod coupling type pyramid lattice structure comprises a core body and a connecting assembly, the core body comprises a plurality of first unit cells and a plurality of second unit cells, each first unit cell comprises a first truss, a second truss, a first straight connecting rod and a first curved connecting rod, and the first trusses and the second trusses are connected in an inserted mode to form a rectangular pyramid structure; the first unit cell comprises a first truss, a second truss, a first straight connecting rod and a first curved connecting rod, the first straight connecting rod is arranged between two inclined rods of the first truss, the first curved connecting rod is arranged between two inclined rods of the second truss, and the second unit cell comprises a third truss, a fourth truss, a second straight connecting rod and a second curved connecting rod; the second curved connecting rod is arranged between the two inclined rods of the fourth truss; the connecting assembly comprises a top frame and a bottom frame which are arranged in a checkerboard shape, the top frame is provided with a plurality of first mounting parts, and the bottom frame is provided with a plurality of second mounting parts; in this way, the energy absorption effect is better, the good shape and integrity are kept, and expandability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of space lattice structures, and particularly to a link-coupled pyramid lattice structure. Background Art

[0002] As a new type of lightweight structure, the pyramid lattice structure has attracted much attention in the fields of aerospace, transportation, etc. due to its excellent energy absorption ability, high specific strength and high specific stiffness. However, the traditional pyramid lattice structure has defects in structural design. For example, in the traditional four-bar symmetric unit cell, there is an obvious stress concentration phenomenon, and the compressive strength and energy absorption efficiency are relatively low, which is prone to geometric mutation, thus reducing the service life of the component; most of the existing modular designs require external connectors or use fixing methods such as gluing and welding, which are not only time-consuming and laborious, but also increase the weight of the component, making it difficult to meet the lightweight requirements of the lattice structure; it is difficult to replace the traditional integral formed lattice after local damage, and the maintenance cost is relatively high. Summary of the Invention

[0003] The main object of the present invention is to propose a link-coupled pyramid lattice structure to solve the above problems.

[0004] To achieve the above object, a link-coupled pyramid lattice structure proposed by the present invention includes:

[0005] A core body, including a plurality of first unit cells and a plurality of second unit cells connected to each other. The first unit cells and the second unit cells are respectively arranged in a pyramid shape. The first unit cell includes a first truss, a second truss, a first straight link and a first curved link. The first truss and the second truss are respectively triangular trusses and are inserted into each other to form a quadrangular pyramid structure. The first straight link is arranged between the two inclined bars of the first truss. The first curved link is arranged between the two inclined bars of the second truss and is located below the first straight link. The second unit cell includes a third truss, a fourth truss, a second straight link and a second curved link. The third truss and the fourth truss are respectively triangular trusses and are inserted into each other to form a quadrangular pyramid structure. The second straight link is arranged between the two inclined bars of the third truss. The second curved link is arranged between the two inclined bars of the fourth truss and is located below the second straight link; and,

[0006] A connection assembly, including a top frame and a bottom frame spaced apart in the up and down direction. The top frame and the bottom frame are respectively arranged in a checkerboard pattern. The top frame has a plurality of first mounting parts spaced apart. The first mounting parts are clamped with the tops of the first unit cells and the tops of the second unit cells. The bottom frame has a plurality of second mounting parts spaced apart. The second mounting parts are clamped with the bottoms of the first unit cells and the bottoms of the second unit cells.

[0007] Optionally, the first unit cell further includes a first connecting frame, which is disposed within the quadrangular pyramid structure formed by the insertion of the first truss and the second truss, and is sleeved outside the first curved connecting rod. A first fastening structure is provided between the first connecting frame and the first truss and the second truss. The first fastening structure includes at least two first card slots and at least two first fasteners. The two first card slots and the two first fasteners are in one-to-one correspondence and are adapted to be snap-connected. One of the first card slot and the first fastener is disposed on the first connecting frame, and the other is disposed on the diagonal bar of the first truss and / or the diagonal bar of the second truss;

[0008] The second unit cell further includes a second connecting frame, which is disposed within the quadrangular pyramid structure formed by the insertion of the third truss and the fourth truss, and is sleeved outside the second curved connecting rod. A second fastening structure is provided between the second connecting frame and the third truss and the fourth truss. The second fastening structure includes at least two second card slots and at least two second fasteners. The two second card slots and the two second fasteners are in one-to-one correspondence and are adapted to be snap-connected. One of the second card slot and the second fastener is disposed on the second connecting frame, and the other is disposed on the diagonal bar of the third truss and / or the diagonal bar of the fourth truss.

[0009] Optionally, a first installation groove is formed in the first installation portion of the top frame, and the first installation groove is a cross groove;

[0010] A first convex is provided at the top of the first unit cell in a cross shape, and a second convex is provided at the top of the second unit cell in a cross shape. The first convex and the second convex are respectively adapted to be snap-connected with the first installation groove.

[0011] Optionally, a first upper insertion groove with an upward opening is formed at the top of the first truss, and a first lower insertion groove with a downward opening is formed at the top of the second truss, so that the first upper insertion groove and the first truss are correspondingly inserted to form the first convex;

[0012] A second upper insertion groove with an upward opening is formed at the top of the third truss, and a second lower insertion groove with a downward opening is formed at the top of the fourth truss, so that the second upper insertion groove and the third truss are correspondingly inserted to form the second convex.

[0013] Optionally, a second installation groove is formed in the second installation portion of the bottom frame, and the second installation groove is a cross groove;

[0014] Third convexes are respectively provided at the bottom ends of the two diagonal bars of the first truss, and the third convexes are clamped in the second installation groove;

[0015] The bottom ends of the two diagonal rods of the second truss are respectively provided with fourth clamping protrusions, and the fourth clamping protrusions are clamped in the second installation groove;

[0016] The bottom ends of the two diagonal rods of the third truss are respectively provided with fifth clamping protrusions, and the fifth clamping protrusions are clamped in the second installation groove;

[0017] The bottom ends of the two diagonal rods of the fourth truss are respectively provided with sixth clamping protrusions, and the sixth clamping protrusions are clamped in the second installation groove.

[0018] Optionally, the width of the third clamping protrusion is 1 / 2 of the width of the diagonal rod of the first truss, and the two third clamping protrusions of the first truss are arranged staggeredly;

[0019] The width of the fourth clamping protrusion is 1 / 2 of the width of the diagonal rod of the second truss, and the two fourth clamping protrusions of the second truss are arranged staggeredly;

[0020] The width of the fifth clamping protrusion is 1 / 2 of the width of the diagonal rod of the third truss, and the two fifth clamping protrusions of the third truss are arranged staggeredly;

[0021] The width of the sixth clamping protrusion is 1 / 2 of the width of the diagonal rod of the fourth truss, and the two sixth clamping protrusions of the fourth truss are arranged staggeredly.

[0022] Optionally, the groove width of the second installation groove is greater than or equal to the width of the diagonal rod;

[0023] The third clamping protrusions / fourth clamping protrusions of any two adjacent first unit cells in the core body can be clamped in the second installation groove side by side along the width direction of the diagonal rod;

[0024] The fifth clamping protrusions / sixth clamping protrusions of any two adjacent second unit cells in the core body can be clamped in the second installation groove side by side along the width direction of the diagonal rod;

[0025] The third clamping protrusion of any adjacent first unit cell and the sixth clamping protrusion of the second unit cell in the core body can be clamped in the second installation groove side by side along the width direction of the diagonal rod;

[0026] The fourth clamping protrusion of any adjacent first unit cell and the fifth clamping protrusion of the second unit cell in the core body can be clamped in the second installation groove side by side along the width direction of the diagonal rod.

[0027] Optionally, the third clamping protrusion is provided with a first upper groove with the notch facing upward, and the fourth clamping protrusion is provided with a first lower groove with the notch facing downward;

[0028] The fifth card projection is provided with a second lower groove with a downward notch, and the second lower groove is adapted to the first upper groove so that the third card projection and the fifth card projection can be adaptively clamped. The sixth card projection is provided with a second upper groove with an upward notch, and the second upper groove is adapted to the first lower groove so that the fourth card projection and the sixth card projection can be adaptively clamped;

[0029] Any adjacent first unit cell and second unit cell in the core can be clamped by the third card projection and the fifth card projection and then clamped in the second installation groove;

[0030] Any adjacent first unit cell and second unit cell in the core can be clamped by the fourth card projection and the sixth card projection and then clamped in the second installation groove.

[0031] Optionally, the first truss, the second truss, the third truss, and the fourth truss are respectively prepared by using fiber-reinforced composite materials;

[0032] The top frame and the bottom frame are respectively prepared by using composite materials, metal materials, or polymer materials.

[0033] Optionally, the first truss, the second truss, the third truss, and the fourth truss are respectively prepared by using 3D printing methods, molding methods, or hot pressing methods;

[0034] The top frame and the bottom frame are respectively prepared by using 3D printing methods, molding methods, or hot pressing methods.

[0035] In the technical solution of the present invention, by setting the straight connecting rod and the curved connecting rod, the two trusses in each unit cell are connected in a connecting rod coupling manner, which not only enables the first unit cell and the second unit cell to bear greater loads in the vertical and horizontal directions, has a better energy absorption effect, and can maintain a better shape and integrity; at the same time, the modular design of the first unit cell, the second unit cell, the top frame, and the bottom frame can effectively reduce the manufacturing cost and transportation cost, and the assembly is carried out by plugging and clamping methods, which is convenient to operate and has a low maintenance cost, and can adjust the structural specifications according to actual needs, and has high scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0037] Figure 1Schematic diagram of a structure of an embodiment of the connecting rod-coupled pyramid lattice structure provided by the present invention;

[0038] Figure 2 For Figure 1 Schematic diagram of the structure of the first unit cell in;

[0039] Figure 3 For Figure 2 Partial schematic diagram of the structure of the first unit cell in;

[0040] Figure 4 For Figure 2 Partial schematic diagram of the structure of the first unit cell in;

[0041] Figure 5 For Figure 2 Partial schematic diagram of the structure of the first unit cell in;

[0042] Figure 6 For Figure 1 Schematic diagram of the structure of the second unit cell in;

[0043] Figure 7 For Figure 6 Partial schematic diagram of the structure of the second unit cell in;

[0044] Figure 8 For Figure 6 Partial schematic diagram of the structure of the second unit cell in;

[0045] Figure 9 For Figure 6 Partial schematic diagram of the structure of the second unit cell in;

[0046] Figure 10 For Figure 1 Schematic diagram of the structure of the top frame / bottom frame in;

[0047] Figure 11 For Figure 1 Schematic diagram of the connection of multiple first unit cells in;

[0048] Figure 12 For Figure 1 Schematic diagram of the connection of the first unit cell and the second unit cell (one embodiment);

[0049] Figure 13 For Figure 1 Schematic diagram of the connection of the first unit cell and the second unit cell (another embodiment);

[0050] Figure 14 For Figure 1 Schematic diagram of the connection of multiple second unit cells in;

[0051] Figure 15This is a comparison test chart of the compression load-compression displacement curves of the first unit cell of the connecting rod-coupled pyramid lattice structure provided by the present invention with the existing pyramid unit cell I structure and pyramid unit cell II structure.

[0052] Explanation of the reference numerals in the drawings:

[0053]

[0054]

[0055] The realization of the purpose of the present invention, its functional characteristics and advantages will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0056] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0057] It should be noted that if there are directional indications (such as up, down, left, right, front, back,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0058] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0059] As a new type of lightweight structure, the pyramid lattice structure has attracted much attention in the fields of aerospace, transportation, etc. due to its excellent energy absorption ability, high specific strength, and high specific stiffness. However, the traditional pyramid lattice structure has defects in structural design. For example, in the traditional four-bar symmetric unit cell, there is an obvious stress concentration phenomenon, and the compressive strength and energy absorption efficiency are relatively low, which is prone to geometric mutation, thus reducing the service life of the component; most of the existing modular designs require external connectors or use fixing methods such as gluing and welding, which are not only time-consuming and laborious, but also increase the weight of the component, making it difficult to meet the lightweight requirements of the lattice structure; it is difficult to replace the traditional integral formed lattice after local damage, and the maintenance cost is relatively high.

[0060] In view of this, the present invention provides a link-coupled pyramid lattice structure 100, Figures 1 to 14 which is an embodiment of the link-coupled pyramid lattice structure 100 provided by the present invention.

[0061] Please refer to Figures 1 to 10 , the link-coupled pyramid lattice structure 100 includes a core body 1 and a connection assembly 2. The core body 1 includes a plurality of first unit cells 11 and a plurality of second unit cells 12 connected to each other. The first unit cells 11 and the second unit cells 12 are respectively arranged in a pyramid shape. The first unit cell 11 includes a first truss 111, a second truss 112, a first straight link 113, and a first curved link 114. The first truss 111 and the second truss 112 are respectively triangular trusses and are inserted into each other to form a quadrangular pyramid structure. The first straight link 113 is arranged between the two inclined bars of the first truss 111. The first curved link 114 is arranged between the two inclined bars of the second truss 112 and is located below the first straight link 113. The second unit cell 12 includes a third truss 121, a fourth truss 122, a second straight link 123, and a second curved link 124. The third truss 121 and the fourth truss 122 are respectively triangular trusses and are inserted into each other to form a quadrangular pyramid structure. The second straight link 123 is arranged between the two inclined bars of the third truss 121. The second curved link 124 is arranged between the two inclined bars of the fourth truss 122 and is located below the second straight link 123. The connection assembly 2 includes a top frame 21 and a bottom frame 22 spaced apart in the up and down direction. The top frame 21 and the bottom frame 22 are respectively arranged in a checkerboard pattern. The top frame 21 has a plurality of first mounting parts 211 spaced apart. The first mounting parts 211 are clamped with the tops of the first unit cells 11 and the tops of the second unit cells 12. The bottom frame 22 has a plurality of second mounting parts 221 spaced apart. The second mounting parts 221 are clamped with the bottoms of the first unit cells 11 and the bottoms of the second unit cells 12.

[0062] In the technical solution of the present invention, by providing a straight connecting rod and a curved connecting rod, the two trusses in each unit cell are connected by a connecting rod coupling method, which not only enables the first unit cell 11 and the second unit cell 12 to bear greater loads in the vertical and horizontal directions, has a better energy absorption effect, and can maintain a better shape and integrity; at the same time, the first unit cell 11, the second unit cell 12, the top frame 21 and the bottom frame 22 are modularly designed, which can effectively reduce the manufacturing cost and transportation cost, and are assembled by plugging and clamping methods, with convenient operation, low maintenance cost, and can adjust the structural specifications according to actual needs, and have high scalability.

[0063] It should be noted that in the present invention, the curved connecting rod is arranged below the straight connecting rod, that is, the distance from the bottom end of the curved connecting rod to the top end of the truss is greater than the distance from the straight connecting rod to the top end of the truss. In this way, the space between the bottom end of the curved connecting rod and the top end of the truss can be crossed by the first truss 111, so that the straight connecting rod can be inserted into the second truss 112, which is convenient for the assembly of the first truss 111 and the second truss 112.

[0064] Further, please refer to Figure 2 and Figure 5 , the first unit cell 11 further includes a first connecting frame 115. The first connecting frame 115 is arranged inside the quadrangular pyramid structure formed by the plugging of the first truss 111 and the second truss 112, and is sleeved outside the first curved connecting rod 114. A first fastening structure 116 is provided between the first connecting frame 115 and the first truss 111 and the second truss 112. The first fastening structure 116 includes at least two first card slots 1161 and at least two first clasps 1162. The two first card slots 1161 and the two first clasps 1162 correspond to each other and are adaptively clamped. One of the first card slots 1161 and the first clasps 1162 is arranged on the first connecting frame 115, and the other is arranged on the inclined rod of the first truss 111 and / or the inclined rod of the second truss 112; in this way, the structural stability of the first unit cell 11 is improved through the first connecting frame 115.

[0065] Please refer to Figure 6 and Figure 9, the second unit cell 12 further includes a second connection frame 125. The second connection frame 125 is disposed within the pyramid structure formed by the insertion of the third truss 121 and the fourth truss 122, and is sleeved outside the second curved link 124. A second fastening structure 126 is provided between the second connection frame 125 and the third truss 121 and the fourth truss 122. The second fastening structure 126 includes at least two second card slots 1261 and at least two second latches 1262. The two second card slots 1261 and the two second latches 1262 correspond to each other and are adaptively clamped. One of the second card slots 1261 and the second latches 1262 is disposed on the second connection frame 125, and the other is disposed on the inclined rod of the third truss 121 and / or the inclined rod of the fourth truss 122. Thus, the structural stability of the second unit cell 12 is improved through the second connection frame 125.

[0066] It should be noted that in the present invention, the setting forms of the first connection frame 115 and the second connection frame 125 are not limited. They can be arranged in a triangular shape, an elliptical shape, a polygonal shape, etc. Similarly, the number of the first latches 1162 and the second latches 1262 is not limited either. It can be two, three, four, etc. Specifically, please refer to Figure 5 and Figure 9 . In an embodiment of the present invention, the first connection frame 115 and the second connection frame 125 are both arranged in a rhombus shape, and card slots are provided at the four sharp corners of each connection frame, that is, the first card slot 1161 and the second card slot 1261. Correspondingly, convex portions are provided on the inner sides of the two inclined rods of the first truss 111, the inclined rod of the second truss 112, the two inclined rods of the third truss 121, and the two inclined rods of the fourth truss 122 to form latches with the inclined rods, that is, four latches are provided in each unit cell to be adaptively clamped with the card slots of the connection frame.

[0067] Furthermore, please refer to Figure 2 , Figure 6 and Figure 10 . A first installation groove 2111 is provided in the first installation portion 211 of the top frame 21. The first installation groove 2111 is a cross groove. A first card projection 117 arranged in a cross shape is provided at the top end of the first unit cell 11, and a second card projection 127 arranged in a cross shape is provided at the top end of the second unit cell 12. The first card projection 117 and the second card projection 127 are respectively used to be adaptively clamped with the first installation groove 2111.

[0068] Furthermore, please refer to Figures 2 to 4 , Figures 6 to 8, a first upper insertion groove 1111 with an upward opening is formed at the top of the first truss 111, and a first lower insertion groove 1121 with a downward opening is formed at the top of the second truss 112 to be correspondingly inserted and mated with the first upper insertion groove 1111 and the first truss 111 to form the first convex 117; a second upper insertion groove 1211 with an upward opening is formed at the top of the third truss 121, and a second lower insertion groove 1221 with a downward opening is formed at the top of the fourth truss 122 to be correspondingly inserted and mated with the second upper insertion groove 1211 and the third truss 121 to form the second convex 127. In this way, the assembly of the two trusses in the first unit cell 11 and the two trusses in the second unit cell 12 is simple, easy to disassemble and replace, and the maintenance cost is reduced.

[0069] Thus, the assembly process of the first unit cell 11 is as follows: First, the first truss 111 is passed through between the top of the second truss 112 and the top of the first curved link 114, so that the first straight link 113 is inserted into the second truss 112 until the first upper insertion groove 1111 and the first lower insertion groove 1121 correspond to each other, and then the second truss 112 is pushed downward to realize the insertion connection between the first truss 111 and the second truss 112, thereby forming a pyramid structure; then the first connection frame 115 is placed into the pyramid structure, so that the first card slot 1161 of the first connection frame 115 and the first buckle 1162 on the truss are adaptively clamped. In this way, the assembly of the first unit cell 11 is completed.

[0070] It should be noted that the assembly process of the second unit cell 12 is similar to that of the first unit cell 11 and will not be elaborated here one by one.

[0071] Specifically, please refer to Figures 1 to 10 , a second installation groove 2211 is formed in the second installation part 221 of the bottom frame 22, and the second installation groove 2211 is a cross groove; third convexes 118 are respectively arranged at the bottom ends of the two inclined rods of the first truss 111, and the third convexes 118 are clamped in the second installation groove 2211; fourth convexes 119 are respectively arranged at the bottom ends of the two inclined rods of the second truss 112, and the fourth convexes 119 are clamped in the second installation groove 2211; fifth convexes 128 are respectively arranged at the bottom ends of the two inclined rods of the third truss 121, and the fifth convexes 128 are clamped in the second installation groove 2211; sixth convexes 129 are respectively arranged at the bottom ends of the two inclined rods of the fourth truss 122, and the sixth convexes 129 are clamped in the second installation groove 2211. In this way, it is convenient to quickly assemble the bottom frame 22 and each truss.

[0072] Furthermore, please refer to Figures 2 to 4 、 Figures 6 to 8, the width of the third clamping projection 118 is 1 / 2 of the width of the diagonal bar of the first truss 111, and the two third clamping projections 118 of the first truss 111 are arranged staggeredly; the width of the fourth clamping projection 119 is 1 / 2 of the width of the diagonal bar of the second truss 112, and the two fourth clamping projections 119 of the second truss 112 are arranged staggeredly; the width of the fifth clamping projection 128 is 1 / 2 of the width of the diagonal bar of the third truss 121, and the two fifth clamping projections 128 of the third truss 121 are arranged staggeredly; the width of the sixth clamping projection 129 is 1 / 2 of the width of the diagonal bar of the fourth truss 122, and the two sixth clamping projections 129 of the fourth truss 122 are arranged staggeredly. In this way, the two clamping projections on each truss are arranged staggeredly, which can not only ensure the stability of the unit cell but also realize the lightweight design.

[0073] Further, the groove width of the second installation groove 2211 is greater than or equal to the width of the diagonal bar; any two adjacent third clamping projections 118 / fourth clamping projections 119 of the first unit cells 11 in the core body 1 can be arranged side by side along the width direction of the diagonal bar and clamped in the second installation groove 2211 (as Figure 1 and Figure 11 shown); any two adjacent fifth clamping projections 128 / sixth clamping projections 129 of the second unit cells 12 in the core body 1 can be arranged side by side along the width direction of the diagonal bar and clamped in the second installation groove 2211 (as Figure 1 and Figure 14 shown); any adjacent third clamping projection 118 of the first unit cell 11 and sixth clamping projection 129 of the second unit cell 12 in the core body 1 can be arranged side by side along the width direction of the diagonal bar and clamped in the second installation groove 2211 (as Figure 1 and Figure 12 shown); any adjacent fourth clamping projection 119 of the first unit cell 11 and fifth clamping projection 128 of the second unit cell 12 in the core body 1 can be arranged side by side along the width direction of the diagonal bar and clamped in the second installation groove 2211 (as Figure 1 and Figure 12 shown). In this way, in the core body 1, two adjacent unit cells can be fixedly installed by two clamping projections arranged side by side and clamped in the second installation groove 2211, and the installation is stable and the operation is quick and convenient.

[0074] Specifically, please refer to Figures 1 to 4 、 Figures 6 to 8As shown, the third clamping projection 118 is provided with a first upper groove 1181 with an upwardly opening notch, and the fourth clamping projection 119 is provided with a first lower groove 1191 with a downwardly opening notch; the fifth clamping projection 128 is provided with a second lower groove 1281 with a downwardly opening notch, and the second lower groove 1281 is adapted to the first upper groove 1181 so that the third clamping projection 118 and the fifth clamping projection 128 can be adaptively clamped; the sixth clamping projection 129 is provided with a second upper groove 1291 with an upwardly opening notch, and the second upper groove 1291 is adapted to the first lower groove 1191 so that the fourth clamping projection 119 and the sixth clamping projection 129 can be adaptively clamped; any adjacent first unit cell 11 and second unit cell 12 in the core body 1 can be clamped in the second installation groove 2211 after being clamped by the third clamping projection 118 and the fifth clamping projection 128 (as Figure 1 and Figure 13 shown); any adjacent first unit cell 11 and second unit cell 12 in the core body 1 can be clamped in the second installation groove 2211 after being clamped by the fourth clamping projection 119 and the sixth clamping projection 129 (as Figure 1 and Figure 13 shown). The installation is stable and the operation is quick and convenient.

[0075] Furthermore, based on the above-mentioned embodiment of "the groove width of the second installation groove 2211 is greater than or equal to the width of the diagonal rod; the third clamping projections 118 / fourth clamping projections 119 of any two adjacent first unit cells 11 in the core body 1 can be arranged side by side in the width direction of the diagonal rod and clamped in the second installation groove 2211; the fifth clamping projections 128 / sixth clamping projections 129 of any two adjacent second unit cells 12 in the core body 1 can be arranged side by side in the width direction of the diagonal rod and clamped in the second installation groove 2211", when any two adjacent first unit cells 11 and a second unit cell 12 in the core body 1 are connected, the third clamping projections 118 / fourth clamping projections 119 of the two first unit cells 11 can be arranged side by side in the width direction of the diagonal rod and clamped in the second installation groove 2211, and the fifth clamping projections 128 / sixth clamping projections 129 of the second unit cell 12 are correspondingly clamped to the third clamping projections 118 / fourth clamping projections 119 of the two first unit cells 11 and clamped in the second installation groove 2211; when any two adjacent second unit cells 12 and a first unit cell 11 in the core body 1 are connected, the fifth clamping projections 128 / sixth clamping projections 129 of the two second unit cells 12 can be arranged side by side in the width direction of the diagonal rod and clamped in the second installation groove 2211, and the third clamping projections 118 / fourth clamping projections 119 of the first unit cell 11 are correspondingly clamped to the fifth clamping projections 128 / sixth clamping projections 129 of the two second unit cells 12 and clamped in the second installation groove 2211. The installation is stable and the operation is quick and convenient.

[0076] Specifically, in the present invention, the first truss 111, the second truss 112, the third truss 121, and the fourth truss 122 can be made of any material respectively. More specifically, in an embodiment of the present invention, the first truss 111, the second truss 112, the third truss 121, and the fourth truss 122 are made of fiber-reinforced composite materials respectively; the top frame 21 and the bottom frame 22 are made of composite materials, metal materials, or polymer materials respectively.

[0077] More specifically, the fiber-reinforced composite material is a continuous fiber or short fiber-reinforced composite material such as glass fiber, basalt fiber, carbon fiber, or aramid fiber.

[0078] Specifically, in the present invention, the first truss 111, the second truss 112, the third truss 121, and the fourth truss 122 are prepared by 3D printing, molding, or hot pressing respectively; the top frame 21 and the bottom frame 22 are prepared by 3D printing, molding, or hot pressing respectively.

[0079] A link-coupled pyramid lattice structure 100 provided by the present invention, under the same experimental conditions and experimental materials, the first unit cell 11 is compared with the existing pyramid-shaped unit cell I structure and pyramid-shaped unit cell II structure. Through the comparison test of the compression load-compression displacement curve, it shows that (as Figure 15 shown), it has significant performance advantages: the link-coupled pyramid lattice structure 100 provided by the present invention is improved by 23% compared with the pyramid-shaped unit cell I structure and 12% compared with the pyramid-shaped unit cell II structure; the energy absorption efficiency is 2.59 times and 1.61 times that of the pyramid-shaped unit cell I structure and pyramid-shaped unit cell II structure respectively. The above data verify the significant progress of the structure of the present invention in compressive performance and energy absorption capacity.

[0080] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A connecting rod coupling type pyramid lattice structure, characterized in that: include: A core body, comprising a plurality of first unit cells and a plurality of second unit cells connected to each other, wherein the first unit cells and the second unit cells are respectively arranged in a pyramid shape, the first unit cell comprises a first truss, a second truss, a first straight link and a first curved link, the first truss and the second truss are respectively triangular trusses, and are plugged into each other to form a quadrangular pyramid structure, the first straight link is arranged between two oblique rods of the first truss, the first curved link is arranged between two oblique rods of the second truss, and is located below the first straight link, the second unit cell comprises a third truss, a fourth truss, a second straight link and a second curved link, the third truss and the fourth truss are respectively triangular trusses, and are plugged into each other to form a quadrangular pyramid structure, the second straight link is arranged between two oblique rods of the third truss, the second curved link is arranged between two oblique rods of the fourth truss, and is located below the second straight link; and, A connecting component includes a top frame and a bottom frame spaced apart in the up-down direction, wherein the top frame and the bottom frame are arranged in a checkerboard shape, the top frame has a plurality of first mounting portions spaced apart, the first mounting portions are snap-fitted with the top end of the first unit cell and the top end of the second unit cell, and the bottom frame has a plurality of second mounting portions spaced apart, the second mounting portions are snap-fitted with the bottom end of the first unit cell and the bottom end of the second unit cell.

2. A connecting rod coupling type pyramid lattice structure as claimed in claim 1, characterized in that: The first unit cell further includes a first connecting frame, the first connecting frame is arranged in a quadrangular pyramid structure formed by plugging the first truss and the second truss, and is sleeved outside the first curved connecting rod, a first buckling structure is arranged between the first connecting frame and the first truss and the second truss, the first buckling structure includes at least two first slots and at least two first buckles, the two first slots and the two first buckles correspond to each other one by one and are adapted to be buckled, one of the first slot and the first buckle is arranged in the first connecting frame, and the other is arranged in the oblique rod of the first truss and / or the oblique rod of the second truss; The second unit cell also includes a second connecting frame, which is arranged in a four-sided pyramid structure formed by plugging the third truss and the fourth truss, and is sleeved on the outside of the second curved connecting rod. A second buckling structure is provided between the second connecting frame and the third truss and the fourth truss. The second buckling structure includes at least two second slots and at least two second buckles. The two second slots and the two second buckles correspond to each other one by one and are adapted to be snapped together. One of the second slot and the second buckle is arranged on the second connecting frame, and the other is arranged on the diagonal rod of the third truss and / or the diagonal rod of the fourth truss.

3. A connecting rod coupling type pyramid lattice structure as claimed in claim 2, characterized in that: The first mounting portion of the top frame is provided with a first mounting groove, and the first mounting groove is a cross groove; A first latching protrusion arranged in a cross shape is provided at the top of the first unit cell, and a second latching protrusion arranged in a cross shape is provided at the top of the second unit cell. The first latching protrusion and the second latching protrusion are respectively used for adapting and engaging with the first mounting groove.

4. A connecting rod coupling type pyramid lattice structure as claimed in claim 3, characterized in that: The top of the first truss is provided with a first upper embedding groove opening upward, and the top of the second truss is provided with a first lower embedding groove opening downward, so that the first upper embedding groove is adapted to be plugged with the first truss to form the first clamping protrusion; The top of the third truss is provided with a second upper embedding groove opening upward, and the top of the fourth truss is provided with a second lower embedding groove opening downward, so that the second upper embedding groove corresponds to the third truss and is adapted to be plugged into the second latching protrusion.

5. A connecting rod coupling type pyramid lattice structure as claimed in claim 2, characterized in that: The second mounting portion of the bottom frame is provided with a second mounting groove, and the second mounting groove is a cross groove; The bottom ends of the two oblique rods of the first truss are respectively provided with third locking protrusions, and the third locking protrusions are locked in the second installation grooves; The bottom ends of the two oblique rods of the second truss are respectively provided with fourth locking protrusions, and the fourth locking protrusions are locked in the second installation grooves; The bottom ends of the two oblique rods of the third truss are respectively provided with fifth locking protrusions, and the fifth locking protrusions are locked in the second mounting grooves; The bottom ends of the two oblique rods of the fourth truss are respectively provided with sixth latching protrusions, and the sixth latching protrusions are latched in the second installation grooves.

6. A connecting rod coupling type pyramid lattice structure as claimed in claim 5, characterized in that: The width of the third clamping protrusion is 1 / 2 of the width of the diagonal rod of the first truss, and the two third clamping protrusions of the first truss are staggered; The width of the fourth clamping protrusion is 1 / 2 of the width of the oblique rod of the second truss, and the two fourth clamping protrusions of the second truss are staggered; The width of the fifth clamping protrusion is 1 / 2 of the width of the diagonal rod of the third truss, and the two fifth clamping protrusions of the third truss are staggered; The width of the sixth latching protrusion is 1 / 2 of the width of the oblique rod of the fourth truss, and the two sixth latching protrusions of the fourth truss are staggered.

7. A connecting rod coupling type pyramid lattice structure as claimed in claim 6, characterized in that: The width of the second mounting groove is greater than or equal to the width of the diagonal rod; The third locking protrusions / fourth locking protrusions of any two adjacent first unit cells in the core body can be arranged side by side along the width direction of the oblique rod and locked in the second installation groove; The fifth locking protrusions / sixth locking protrusions of any two adjacent second unit cells in the core body can be arranged side by side along the width direction of the oblique rod and locked in the second installation groove; Any adjacent third locking protrusions of the first unit cell and the sixth locking protrusions of the second unit cell in the core body can be arranged side by side along the width direction of the oblique rod and locked in the second installation groove; Any adjacent fourth latching protrusions of the first unit cell and the fifth latching protrusions of the second unit cell in the core body can be arranged side by side along the width direction of the oblique rod and latched in the second installation groove.

8. A connecting rod coupling type pyramid lattice structure as claimed in claim 6 or 7, characterized in that: The third clamping protrusion is provided with a first upper groove with a notch upwardly disposed, and the fourth clamping protrusion is provided with a first lower groove with a notch downwardly disposed; The fifth clamping protrusion is provided with a second lower groove with a notch set downward, and the second lower groove is adapted to the first upper groove, so that the third clamping protrusion and the fifth clamping protrusion can be adapted to be engaged, and the sixth clamping protrusion is provided with a second upper groove with a notch set upward, and the second upper groove is adapted to the first lower groove, so that the fourth clamping protrusion and the sixth clamping protrusion can be adapted to be engaged; Any adjacent first unit cell and second unit cell in the core body can be clamped in the second installation groove after being clamped by the third clamping protrusion and the fifth clamping protrusion; Any adjacent first unit cell and second unit cell in the core body can be clamped in the second installation groove after being clamped by the fourth clamping protrusion and the sixth clamping protrusion.

9. The connecting rod coupling type pyramid lattice structure according to claim 1, characterized in that: The first truss, the second truss, the third truss and the fourth truss are respectively made of fiber-reinforced composite materials; The top frame and the bottom frame are respectively made of composite materials, metal materials or polymer materials.

10. The connecting rod coupling type pyramid lattice structure according to claim 1, characterized in that: The first truss, the second truss, the third truss and the fourth truss are respectively prepared by a 3D printing method, a molding method or a hot pressing method; The top frame and the bottom frame are respectively prepared by a 3D printing method, a molding method or a hot pressing method.

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