Negative Poisson's ratio honeycomb type anti-explosion tank with gradient thickness

Abstract

The invention discloses a thickness gradient negative Poisson's ratio honeycomb type anti-explosion tank which comprises a cylindrical outer wall, a cylindrical inner wall installed in the cylindrical outer wall, a thickness gradient honeycomb core arranged between the cylindrical outer wall and the cylindrical inner wall, a cover installed at the upper end of the cylindrical outer wall and barrel wall handrails arranged on the two sides of the cylindrical outer wall. The thickness gradient honeycomb core is a three-layer cylindrical honeycomb core which is made of an aluminum alloy material and forms a thickness gradient, and a Q413m type polyurea coating is sprayed on the cylindrical inner wall. When explosion occurs in the tank, impact energy generated by explosives is absorbed mainly through plastic deformation of the honeycomb core forming the thickness gradient, so that the cylindrical outer wall generates small deflection; compared with the prior art, the high-strength anti-explosion cable has the advantages of being light in structural design weight, still high in strength, high in anti-explosion capacity, low in cost, good in applicability and convenient to popularize.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof tanks, and particularly relates to a negative Poisson's ratio honeycomb explosion-proof tank with a thickness gradient. Background Art

[0002] As an explosion-proof device for maintaining public safety and reducing the damage of explosive items, an explosion-proof tank needs to achieve both an anti-explosion effect and be conducive to movement and handling. Currently, explosion-proof tanks are mainly made of thick high-strength special steel plates, or are made by compounding thin steel plates with organic materials such as rubber plates, resins, and porous fiber bundles. The former has strong anti-explosion ability, but is expensive and too heavy; the latter has a reduced weight, but its anti-explosion characteristics are poor; their common disadvantage is that they cannot be reused.

[0003] Therefore, designing an explosion-proof tank with light weight, strong anti-explosion ability, and low cost has become an urgent need in the field of public safety. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention designs a negative Poisson's ratio honeycomb explosion-proof tank with a thickness gradient.

[0005] In order to achieve the above technical effects, the present invention is realized through the following technical solutions: A negative Poisson's ratio honeycomb explosion-proof tank with a thickness gradient, comprising a tank body and a lid installed at the upper end of the tank body, characterized in that the tank body includes a cylindrical outer wall, a cylindrical inner wall installed inside the cylindrical outer wall, a thickness gradient honeycomb core arranged between the cylindrical outer wall and the cylindrical inner wall, barrel wall handrails arranged on both sides of the cylindrical outer wall, and universal wheels installed at the lower end of the cylindrical outer wall;

[0006] The thickness gradient honeycomb core is a three-layer cylindrical honeycomb core made of aluminum alloy material, and the cylindrical inner wall is sprayed with a 4-mm-thick polyurea coating of type Q413m.

[0007] Further, the three-layer cylindrical honeycomb core is installed in a positive gradient or a reverse gradient.

[0008] Further, the thickness gradient honeycomb core is 1.2 m high, has three layers in the radial direction, the radial thickness of each layer is 8 cm, and the central diameters are 0.8 m, 0.96 m, and 1.12 m respectively;

[0009] When installed in a positive gradient, the thickness of the respective cell trunks increases sequentially from the inside to the outside, being 1.2 mm, 1.6 mm, and 2 mm respectively, and a honeycomb sandwich with a thickness gradient is formed as a whole;

[0010] When installed in a reverse gradient, the thickness of the respective cell trunks decreases sequentially from the inside to the outside, being 2 mm, 1.6 mm, and 1.2 mm respectively, and a honeycomb sandwich with a thickness gradient is formed as a whole.

[0011] Furthermore, the cells of the thickness-gradient honeycomb core are improved on the basis of the butterfly-shaped cells. The structure of the outer cells remains unchanged, and scaled-down butterfly-shaped cells are added inside, forming a novel and stable-deformation-mode secondary load-bearing cell.

[0012] Furthermore, the equal-proportion value for the equal-proportion reduction, i.e., the value of L2 / L1, ranges from 0.2 to 0.4, and the secondary dry thickness t2 of the cell is 1 mm.

[0013] Furthermore, both the cylindrical outer wall and the cylindrical inner wall are made of B280 material.

[0014] Furthermore, the universal wheels used are existing universal wheels with brakes.

[0015] The beneficial effects of the present invention are as follows:

[0016] The present invention adopts a multi-level energy dissipation mechanism to achieve efficient attenuation of explosion shock loads; its innovative structure is manifested as a three-level honeycomb core layer with a gradient distribution along the thickness direction, and the honeycomb cells at each level exhibit a gradually changing negative Poisson's ratio characteristic through parametric design; when subjected to an explosion shock wave, the tank can absorb a relatively high amount of energy and have a relatively small deflection; compared with a solid explosion-proof tank of the same mass, this structure has excellent anti-explosion performance, with significantly increased absorbed energy and a relatively small radial deformation of the cylindrical outer wall; when dealing with various explosion loads, effective protection can be achieved by adjusting the structural parameters; this structure has good anti-explosion ability and lightweight characteristics, and can be adjusted accordingly according to actual working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0018] Figure 1 It is a schematic diagram of the structure of the negative Poisson's ratio honeycomb explosion-proof tank with a thickness gradient according to the present invention;

[0019] Figure 2 For the present invention Figure 1 It is a schematic cross-sectional view along line A-A in the present invention;

[0020] Figure 3 It is a schematic diagram of the secondary negative Poisson's ratio double-arc cell according to the present invention;

[0021] Figure 4Schematic diagram of the energy absorbed by Embodiment 1, Embodiment 2 of the present invention and an equal-mass solid structure under three explosion loads.

[0022] Figure 5 Schematic diagram of the maximum radial displacement of Embodiment 1, Embodiment 2 of the present invention and an equal-mass solid structure under three explosion loads.

[0023] In the drawings, the list of components represented by each reference numeral is as follows:

[0024] 1. Lid; 2. Tank body; 2-1. Cylindrical outer wall; 2-2. Thickness-gradient honeycomb core; 2-3. Cylindrical inner wall; 2-4. Polyurea coating; 2-5. Handrail on the barrel wall; 3. Universal wheel. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1

[0027] This embodiment describes the positive gradient installation of a three-layer cylindrical honeycomb core, specifically as follows:

[0028] Refer to Figures 1 to 3 As shown, a honeycomb explosion-proof tank with a negative Poisson's ratio and a thickness gradient includes a tank body 2 and a lid 1 installed at the upper end of the tank body 2. It is characterized in that the tank body 2 includes a cylindrical outer wall 2-1, a cylindrical inner wall 2-3 installed inside the cylindrical outer wall 2-1, a thickness-gradient honeycomb core 2-2 arranged between the cylindrical outer wall 2-1 and the cylindrical inner wall 2-3, handrails 2-4 on both sides of the cylindrical outer wall 2-1, and universal wheels 3 installed at the lower end of the cylindrical outer wall 2-1;

[0029] The thickness-gradient honeycomb core 2-2 is a three-layer cylindrical honeycomb core made of aluminum alloy material. The cylindrical inner wall 2-3 is sprayed with a 4-mm-thick polyurea coating of type Q413m; the three-layer cylindrical honeycomb core is installed in a positive gradient, and the cell thickness increases sequentially from the inside to the outside.

[0030] The thickness-gradient honeycomb core 2-2 is 1.2 m high. The honeycomb core has three layers in the radial direction, and the radial thickness of each layer is 8 cm. The central diameters are 0.8 m, 0.96 m, and 1.12 m respectively; the main thickness t1 of each cell increases sequentially from the inside to the outside, being 1.2 mm, 1.6 mm, and 2 mm respectively, forming a honeycomb sandwich with a thickness gradient as a whole;

[0031] The cell of the gradient honeycomb core with thickness H is improved based on the imitation butterfly-shaped cell. The structure of the outer cell remains unchanged, and imitation butterfly-shaped cells scaled down in equal proportion are added inside, forming a novel secondary load-bearing cell with a stable deformation mode. The equal proportion value of the equal proportion reduction, i.e., L2 / L1, ranges from 0.2 to 0.4, and the secondary stem thickness t2 of the cell is 1 mm. The arc radius r2 of the imitation butterfly-shaped cell added inside is scaled down in equal proportion with the arc radius r1 of the original imitation butterfly-shaped cell, and the reduction ratio is the same as that of the imitation butterfly-shaped cell.

[0032] Both the cylindrical outer wall 2-1 and the cylindrical inner wall 2-3 are made of B280 material.

[0033] The universal wheel 3 used is an existing universal wheel with a brake. The universal wheel 3 is arranged at the bottom of the cylindrical outer wall 2-1, and the 4 arranged universal wheels 3 are centrosymmetric.

[0034] Embodiment 2

[0035] This embodiment describes the reverse gradient installation of the three-layer cylindrical honeycomb core as follows:

[0036] Refer to Figures 1 to 3 As shown, a honeycomb explosion-proof tank with a negative Poisson's ratio and thickness gradient includes a tank body 2 and a lid 1 installed at the upper end of the tank body. It is characterized in that the tank body 2 includes a cylindrical outer wall 2-1, a cylindrical inner wall 2-3 installed inside the cylindrical outer wall 2-1, a thickness gradient honeycomb core 2-2 arranged between the cylindrical outer wall 2-1 and the cylindrical inner wall 2-3, barrel wall handrails 2-4 arranged on both sides of the cylindrical outer wall 2-1, and universal wheels 3 installed at the lower end of the cylindrical outer wall 2-1;

[0037] The thickness gradient honeycomb core 2-2 is a three-layer cylindrical honeycomb core made of aluminum alloy material. The cylindrical inner wall 2-3 is sprayed with a 4-mm-thick polyurea coating of type Q413m. The three-layer cylindrical honeycomb core is installed in reverse gradient, and the cell thickness decreases successively from the inside to the outside.

[0038] The thickness gradient honeycomb core 2-2 is 1.2 m high. The honeycomb core has three layers in the radial direction, and the radial thickness of each layer is 8 cm. The central diameters are 0.8 m, 0.96 m, and 1.12 m respectively. The main thickness t1 of each cell decreases successively from the inside to the outside, being 2 mm, 1.6 mm, and 1.2 mm respectively, forming a honeycomb sandwich with a thickness gradient as a whole.

[0039] The cell of the gradient honeycomb core with a thickness of H is improved on the basis of the butterfly-like cell. The outer cell structure remains unchanged, and the butterfly-like cell that is proportionally reduced is added to the inner side, forming a novel secondary load-bearing cell with a stable deformation mode; the proportional value of the proportional reduction, i.e., L2 / L1, or the value range is between 0.2 and 0.4, and the cell secondary trunk thickness t2 is 1 mm; the arc radius r2 of the butterfly-like cell added to the inner side is proportionally reduced by the arc radius r1 of the original butterfly-like cell, and its reduction ratio is the same as the reduction ratio of the butterfly-like cell.

[0040] The cylindrical outer wall 2-1 and the cylindrical inner wall 2-3 are both made of B280 material.

[0041] The universal wheel 3 adopts the existing universal wheel with brake. The universal wheel 3 is arranged at the bottom of the cylindrical outer wall, and the four universal wheels are arranged in a central symmetric manner.

[0042] Example 3

[0043] See also Figure 4 and Figure 5 It can be seen that the present invention can achieve quasi-perfect protection when subjected to various explosion loads; the explosion-proof properties of the structure can be improved by designing the gradient parameters of the honeycomb core; secondly, the present invention designs the size of the honeycomb cells to make the structure have a more significant negative Poisson's ratio characteristic; when subjected to explosion loads, the structural deformation is more stable and more energy is absorbed.

[0044] See also Figure 4 It can be seen that the energy absorbed by the honeycomb sandwich explosion-proof tank with a positive gradient and a negative Poisson's ratio in Example 1 under 3kg, 6kg and 9kg TNT explosive loads is 52.35kJ, 210.52kJ and 469.96kJ respectively; its energy absorption effect is equivalent to that of a solid explosion-proof tank of the same mass, which is increased by 10.04, 11.54 and 9.71 times respectively. It can be found that the energy absorption effect is improved more significantly under a 6kg TNT explosive load.

[0045] See also Figure 5 It can be seen that the radial displacement of the center point of Example 1 is 0.61mm, 0.88mm and 1.14mm under 3kg, 6kg and 9kg TNT explosive loads respectively; under the three explosion loads, the radial displacement of the center point is only 20.2%, 16.4% and 15.2% of the solid explosion-proof tank of the same mass.

[0046] See also Figure 4It can be seen that the energy absorption of the negative Poisson's ratio honeycomb sandwich explosion-proof tank with a negative gradient in Example 2 is also significantly higher than that of an equal-mass solid explosion-proof tank. Compared with the structure of Example 1, the energy absorption decreases by 45.7%, 26.8%, and 20.4% under 3 kg, 6 kg, and 9 kg of TNT explosive loads, respectively.

[0047] Refer to Figure 5 It can be seen that the radial displacement of the center point in Example 2 is less than that in Example 1 under 3 kg and 6 kg of TNT explosive loads, but greater than that in Example 1 under 9 kg of TNT explosive load.

[0048] In summary, it can be seen from the energy absorption and the radial displacement curve of the center point that the present invention has excellent protective performance under 3 - 9 kg of TNT explosive loads, and can be used in different situations by exchanging the gradient form of the honeycomb core.

[0049] Applying the above technical solutions, the advantages of the present invention are as follows:

[0050] It has excellent protective performance under 3 - 9 kg of TNT explosive loads. The energy absorption effect of the present invention under the three explosion loads is 5.41 - 10.04 times that of an equal-mass solid explosion-proof tank, while the radial displacement of the center point is only between 0.152 and 0.202 times that of an equal-mass solid explosion-proof tank. The energy absorption effect of the honeycomb sandwich explosion-proof tank structure with a positive gradient is better than that of the negative gradient structure, especially under 3 kg of TNT explosive load, and the energy absorption effect is increased by 84.1%.

[0051] Compared with the structure composed of traditional solid plates, the present invention has better load-bearing performance and lightweight performance, improves the material utilization efficiency, has good economic benefits, and has good bending resistance and energy absorption effect. In addition, materials such as ethylene propylene diene monomer rubber with high temperature resistance and corrosion resistance can be provided on the wall surface of the sandwich layer of the honeycomb sandwich panel to further improve the sound insulation, noise reduction, and heat insulation performance of the sandwich panel structure.

[0052] Compared with the structure composed of traditional solid plates, the structure of the present invention is simple, has low manufacturing cost, has better load-bearing capacity and lightweight characteristics, improves the material utilization efficiency, realizes good economic benefits, and at the same time, it also has a stable deformation mode and excellent bending resistance; in addition, the wall surface of the gradient honeycomb core layer can adopt materials such as ethylene propylene diene monomer rubber with high temperature resistance and corrosion resistance to further enhance the sound insulation, noise reduction, and heat insulation performance of the sandwich panel.

[0053] The parameters and structures have a large design space; the geometric dimensions of the honeycomb core cells, the values of L2 / L, the radial gradient thickness value of the honeycomb core, and the parameters of the cylindrical inner and outer walls and the polyurea coating thickness in the present invention can all be adjusted. At the same time, there are two options for the gradient form of the honeycomb core, positive gradient and negative gradient, which can be reasonably adjusted according to specific usage scenarios, such as specific requirements for the protection performance under specific explosion loads or requirements for the bearing capacity.

[0054] The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A thickness gradient negative Poisson's ratio honeycomb explosion-proof tank, comprising a tank body and a cover installed on the upper end of the tank body, characterized in that: The tank body comprises a cylindrical outer wall, a cylindrical inner wall installed inside the cylindrical outer wall, a thickness gradient honeycomb core arranged between the cylindrical outer wall and the cylindrical inner wall, a barrel wall handrail arranged on both sides of the cylindrical outer wall, and a universal wheel installed at the lower end of the cylindrical outer wall; The thickness gradient honeycomb core is a three-layer cylindrical honeycomb core made of aluminum alloy material, and the inner wall of the column is sprayed with a 4mm thick Q413m type polyurea coating.

2. The thickness gradient negative Poisson's ratio honeycomb explosion-proof tank according to claim 1, characterized in that: The three-layer columnar honeycomb core is installed in a positive gradient or a reverse gradient.

3. The thickness gradient negative Poisson's ratio honeycomb explosion-proof tank according to claim 1, characterized in that: The thickness gradient honeycomb core is 1.2m high, and has three layers in the radial direction, each layer has a radial thickness of 8cm, and the center diameters are 0.8m, 0.96m, and 1.12m respectively; When the positive gradient is installed, the thickness of each cell trunk increases from the inside to the outside, which are 1.2mm, 1.6mm, and 2mm respectively, forming a honeycomb sandwich with a thickness gradient as a whole; During the reverse gradient installation, the thickness of each cell trunk decreases from the inside to the outside, which are 2mm, 1.6mm, and 1.2mm respectively, forming a honeycomb core with a thickness gradient as a whole.

4. The thickness gradient negative Poisson's ratio honeycomb explosion-proof tank according to claim 1, characterized in that: The cell of the thickness gradient honeycomb core is improved on the basis of the butterfly-like cell. The outer cell structure remains unchanged, and the butterfly-like cell reduced in proportion is added inside to form a novel secondary load-bearing cell with stable deformation mode.

5. The thickness gradient negative Poisson's ratio honeycomb explosion-proof tank according to claim 4, characterized in that: The proportional value of the proportional reduction, ie, L2 / L1, ranges from 0.2 to 0.4, and the secondary trunk thickness t2 of the cell is 1 mm.

6. The thickness gradient negative Poisson's ratio honeycomb explosion-proof tank according to claim 1, characterized in that: The cylindrical outer wall and the cylindrical inner wall are both made of B280 material.

7. The thickness gradient negative Poisson's ratio honeycomb explosion-proof tank according to claim 1, characterized in that: The universal wheel adopts the existing universal wheel with brake.

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