Preparation method of a foldable / unfoldable honeycomb structure lunar module

Abstract

A preparation method of a foldable / unfoldable honeycomb structure lunar module can meet the requirements of astronauts living on extraterrestrial bodies, liquid transportation, pressure-resistant containers, etc. In the present invention, a planar circular ring sheet material is equally divided and marked, misaligned and connected, axially stretched, and then glued and cured at a specified position to obtain a foldable and telescopic hollow honeycomb structure; the structure shaping of the honeycomb structure lunar module is realized by stepwise curing of the resin coating on the honeycomb surface. The present invention proposes a new hollow honeycomb structure as the skeleton structure of the lunar module. The planar honeycomb structure has the advantages of low density and strong pressure resistance, and is applied to the sandwich of anti-theft doors, airplanes, corrugated cardboard, etc. When the planar honeycomb is bent, the honeycomb will be deformed, seriously affecting its mechanical properties. The novel hollow honeycomb structure not only has the advantages of the planar honeycomb, but also solves the problem that the planar honeycomb is difficult to be applied to curved surfaces.

Description

Technical Field

[0001] The present invention belongs to the technical field of lunar module preparation, and particularly relates to a preparation method for a foldable / unfoldable honeycomb structure lunar module. Background Art

[0002] In the construction of lunar bases, accommodation is an important factor. For the advance construction team, a temporary accommodation that can be quickly erected, does not need to have a long lifespan, and can meet the storage of construction equipment and the rest of personnel is completely sufficient. Since the moon does not have an atmospheric environment like the earth, it is entirely exposed to the universe and will be irradiated by a large amount of cosmic rays. Moreover, the moon does not emit light, and its light and heat entirely come from sunlight. Therefore, the temperature difference is huge when there is sunlight or not. To ensure the safety of personnel and equipment, the accommodation should block the irradiation of cosmic rays and also have the effect of heat insulation and heat preservation.

[0003] Currently, the research schemes for lunar module bases mainly include the following: directly sending the module body to land as a lunar module, 3D printing to manufacture a lunar module, using lunar soil bags filled with lunar soil to build a base, sintering lunar soil to make bricks to build a base, transporting a framework combined with lunar soil to build a base, etc. Currently, the main problems faced by lunar module bases are complex construction and high transportation costs. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of complex construction of existing lunar module bases and high transportation costs, and provide a preparation method for a foldable / unfoldable honeycomb structure lunar module. The hollow honeycomb structure lunar module prepared by this method belongs to the scheme of transporting a framework combined with lunar soil to build a base, and has a special axial layer connection and radial seamless honeycomb structure. The honeycomb holes are evenly arranged with their vertical surfaces facing the radial direction. This honeycomb structure has strong radial pressure-bearing capacity, can be flexibly folded and unfolded, and the obtained lunar module is a pressure-resistant structure and is applied to pressure-resistant components.

[0005] To achieve the above purpose, the technical solutions adopted by the present invention are as follows:

[0006] A preparation method for a foldable / unfoldable honeycomb structure lunar module, and the method is as follows:

[0007] Step 1: Prepare a ring structure honeycomb element with a sheet material as the base, and perform precise equal division and marking on it; according to the honeycomb forming principle, perform misaligned connection on the equally divided honeycomb elements to obtain a hollow honeycomb structure;

[0008] Step 2: Arrange heating resistance wires on the surface of the hollow honeycomb, and reserve a power supply access port;

[0009] Step 3: Spray viscous pre-cured epoxy resin on the surface of the hollow honeycomb structure, and cover an isolation film on the surface of the resin layer to obtain a lunar module skeleton;

[0010] Step 4: Bond a flexible inflatable inner membrane to the inner surface of the fully deployed lunar module skeleton, and fold the honeycomb to obtain the honeycomb-structured lunar module in the launch state;

[0011] Step 5: After launching the lunar module to the predetermined position, inflate the flexible inner membrane to deploy the lunar module, energize it through the power inlet reserved by the honeycomb structure, and heat it to perform secondary curing of the pre-cured epoxy resin to complete the curing and shaping of the honeycomb-structured lunar module;

[0012] Step 6: Fill the honeycombs on the surface of the cured honeycomb-structured lunar module with lunar soil to form a cosmic ray shielding layer and a thermal insulation layer, and complete the overall construction of the lunar module.

[0013] Further, in Step 1, the sheet material is one of aluminum sheet, stainless steel sheet, PET sheet, HTPE sheet, PC sheet, PVC sheet, PP sheet, PS sheet, ABS sheet, rubber sheet, polymer film, paper or aramid paper; the ring-structured honeycomb unit is a planar ring sheet, as Figure 1 shown.

[0014] Further, in Step 1, the equal division mainly refers to the equal division of the planar sheet in the honeycomb unit. The shape of the planar sheet is a planar ring, and the planar ring is equally divided into 12 (multiples of 4 such as 16, 20, 24, 28, 32, and the minimum is 12) parts; the marking mainly refers to the marking of the planar sheet in the honeycomb unit; the marking process is as follows: Take one of the equal division lines as the starting line, and starting from the starting line, number and mark the equally divided fan-shaped surfaces in a clockwise direction, as Figure 1 and 2 shown, and mark them as 1, 2, 3... respectively; the staggered connection means: Ensure that the numbers and fan-shaped surfaces of each planar sheet are aligned. The connection positions of the odd layers and the next layer are numbered 1, 5, 9, 13... respectively, as Figure 1 and 2 the black positions, and the connection positions of the even layers and the next layer are 3, 7, 11, 15... respectively, as Figures 1 to 3 the gray parts; the connection is one or more of bonding, welding, fusion, riveting, and sewing.

[0015] Further, in Step 2, the hollow honeycomb surface refers to the six inner wall surfaces of each hexagonal columnar hole, as Figure 4 shown; the laying means bending the resistance wire into a snake shape and pasting it on the hollow honeycomb surface. The density of the resistance wire is determined by the power of the resistance wire to ensure complete curing in the subsequent process.

[0016] Further, in Step 3, the sticky pre-cured epoxy resin is a high-temperature curing epoxy system resin. Without reaching the target temperature, the curing of this system is very slow. It is pre-cured to a relatively high viscosity but does not harden. The surface of the resin layer refers to the surface of the hollow honeycomb after spraying the resin. The isolation film is a polymer film with a smooth surface, such as a PET release film, etc. The main purpose is to prevent the opposing resin layers from sticking to each other.

[0017] Further, in Step 4, the flexible inflatable inner membrane is a polymer membrane with good flexibility and airtightness, such as a silicone resin membrane. After inflation, its shape is a cylindrical shape that fits and unfolds along the inner wall of the lunar module. The folding is along the axial direction, as Figure 5 shown in the axial direction.

[0018] Further, in Step 5, the secondary curing means heating and curing until complete curing.

[0019] Further, in Step 5, the honeycomb on the surface of the lunar module refers to the hexagonal columnar holes formed by the lunar module skeleton and the flexible inner membrane. As Figure 6 shown, lunar soil is filled into this space.

[0020] The beneficial effects of the present invention compared with the prior art are as follows: The present invention proposes a new hollow honeycomb structure as the lunar module skeleton structure. The planar honeycomb structure has advantages such as low density and strong pressure resistance, and is applied to anti-theft door interlayers, airplanes, corrugated cardboard, etc. When the planar honeycomb is bent, it will cause honeycomb deformation, seriously affecting its mechanical properties. This new hollow honeycomb structure combines the advantages of the planar honeycomb and also solves the problem that the planar honeycomb is difficult to be applied to curved surfaces. Moreover, this honeycomb structure will be scalable, foldable during transportation to save space and facilitate transportation, and can be stretched and assembled during use to obtain a finished product, which is convenient and fast. This honeycomb structure has a small solid phase volume, saves costs, and has economic benefits. The conveying framework of this invention has advantages such as foldability and automatic erection, and is suitable for serving as a temporary residence in the early stage of base construction. The foldable framework saves volume, a large number of frameworks can be sent to the moon at one time, the transportation cost is reduced, it can be automatically erected, and it is convenient and fast. Description of the Drawings

[0021] Figure 1 is a schematic diagram of a planar circular ring sheet with numbers;

[0022] Figure 2 is a three-dimensional shape schematic diagram of the circular ring sheet with numbers shown in the hollow honeycomb;

[0023] Figure 3 is a schematic diagram of the connection positions of different layers;

[0024] Figure 4 is a schematic diagram of arranging resistance wires on the six inner walls of the hexagonal columnar holes;

[0025] Figure 5 It is a diagram of the axial direction and radial direction of a foldable honeycomb structure;

[0026] Figure 6 It is a diagram of a hexagonal columnar hole formed by a flexible inner membrane and honeycomb pore walls;

[0027] Figure 7 It is the front view and left view of a hollow honeycomb structure model;

[0028] Figure 8 It is the top view of a hollow honeycomb structure model;

[0029] Figure 9 It is the three-dimensional view of a hollow honeycomb structure model. Specific implementation manners

[0030] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific implementation manners. It should be understood that the specific implementation manners described herein are only used to explain the present invention and do not limit the protection scope of the present invention.

[0031] For the construction of a temporary residence, reference is made to the idea of ancient humans using natural caves for living. An artificial "cave" is built on the lunar surface. This lunar module uses lunar regolith on the moon as a covering. Utilizing the characteristics of lunar regolith in blocking cosmic rays, insulating temperature changes, and being abundant and easily obtainable, it is used as a filler to fill the honeycomb pores, thus forming the structure of an "artificial cave", which can be used as a temporary residence. The honeycomb skeleton provides a supporting role, and the lunar regolith and the flexible inner membrane provide the functions of blocking cosmic rays and heat preservation.

[0032] The present invention adopts a foldable hollow honeycomb structure, which is in a foldable shape during launch. Folding it up can greatly reduce the space occupied, making more space available for personnel and equipment, saving costs. After curing, it has the characteristics of being light in weight and high in strength, can withstand large pressures, and can ensure the safety of internal personnel and equipment. At the same time, heating and curing are carried out using heating resistance wires, which is convenient for curing. During assembly, only need to place the compressed lunar module at the location where the base needs to be placed. First, inflate to make the flexible inner membrane expand into a cylindrical shape, driving the honeycomb skeleton to expand. Then, power on through the power supply reserved port of the heating resistance wire to heat the resistance wire. At this time, the resin layer on the honeycomb skeleton will be cured by heat. When it is completely cured, disconnect the circuit, and the honeycomb skeleton is cured. After that, lunar regolith is filled into the honeycomb pores manually or by machine, and thus the construction of the lunar module is completed and it can be put into use.

[0033] The advantages of this lunar module are as follows: (1) It saves space during launch and can carry a relatively large number of lunar modules for use at one time; (2) It is convenient and fast to set up, only requiring simple steps such as inflating, connecting power, and filling lunar soil; (3) It adopts a lightweight and high-strength honeycomb structure, which saves materials compared to a solid structure and has a lower cost; (4) It uses local materials, utilizing lunar soil to solve the problems of cosmic rays and heat insulation; (5) It has a relatively large internal space and high flexibility. In the face of other situations such as solar flares or meteorite impacts, reinforcement equipment can be added inside the lunar module.

[0034] Existing curved honeycomb structures are basically formed by unfolding a planar honeycomb along the circumferential direction and connecting both ends to form a cylinder. The differences from the present invention are as follows: First, the hollow honeycomb of the present invention is continuous in the circumferential direction without connections, which can ensure uniform stress in the circumferential direction and no defects caused by connections. Second, the present invention is initially annular. Since the existing curved honeycomb structure needs to be unfolded along the annular shape, there are requirements for the number of honeycomb layers. If the number of honeycomb layers is small, it cannot be unfolded into a complete circle. The number of layers of the present invention determines the axial height of the hollow honeycomb structure. Third, when the existing curved honeycomb is unfolded, the degree of unfolding of the honeycomb holes in different parts is different. The honeycomb holes inside are less unfolded, while those outside are more unfolded, and the honeycomb hole walls are deformed during unfolding, with the honeycomb hole walls closer to the outer wall being more deformed. The honeycomb structure of the present invention has a similar degree of unfolding in each part, and the size and shape of each circle of honeycomb holes are basically the same, without defects and with more uniform stress-bearing capacity.

[0035] The present invention can meet the needs of astronauts living on extraterrestrial bodies, liquid transportation, and pressure-resistant containers, etc. The present invention uses a planar circular ring-shaped sheet material, which is equally divided, marked, misaligned and connected, axially stretched, and then glued and cured at designated positions to obtain a foldable and telescopic hollow honeycomb structure; the structural shaping of the honeycomb structure lunar module is realized by stepwise curing of the resin coating on the honeycomb surface. The invention has the characteristics of being telescopic, convenient for transportation when folded, and simple to unfold. The innovation lies in solving the problem of rapid prototyping of the cabin body when astronauts land on the moon.

[0036] Example 1:

[0037] (1) Prepare a honeycomb element with a ring structure having an outer diameter of 1 m and an inner diameter of 0.8 m using aramid paper as the base, and perform precise 32 equal divisions and number markings on it;

[0038] (2) Coat epoxy glue at positions 1, 5, 9, 13, 17, …, 25, 29 of the first layer;

[0039] (3) On the premise of ensuring that the fan surfaces and numbers of the next layer are aligned with this layer, closely attach the next layer to this layer to ensure that the glued parts can be bonded.

[0040] (4) Apply epoxy glue to positions 3, 7, 11, 15, …, 27, 31 of the second layer. On the premise of ensuring that the fan surface and number of the lower layer are aligned with this layer, bond the lower layer well.

[0041] (5) The glue application positions of the odd-numbered layers and even-numbered layers are the same as those of the first layer and the second layer respectively. Repeat step (3) to obtain a hollow honeycomb structure of a certain length.

[0042] (6) Paste suitable serpentine thermal resistance wires at each marked position and reserve power inlets.

[0043] (7) Use a stretching tool to stretch the hollow honeycomb structure. After unfolding, first evenly spray pre-cured epoxy resin, and then stick a release film on each resin surface after coating.

[0044] (8) Add a matching cylindrical flexible inflatable inner membrane to the fully unfolded lunar module skeleton and bond the places where the inflatable inner membrane contacts the lunar module skeleton.

[0045] (9) Fold it along the axial direction to obtain the honeycomb-structured lunar module in the launch state.

[0046] (10) After launching to the moon, place the compressed lunar module at the location where the base needs to be placed. First, inflate it to make the flexible inner membrane unfold into a cylindrical shape, driving the honeycomb skeleton to unfold.

[0047] (11) Power on through the power reserve port of the heating resistance wire to heat the resistance wire, so that the resin layer will be cured by heat. Wait until it is completely cured, then disconnect the circuit, and the honeycomb skeleton will be cured.

[0048] (12) Fill the honeycomb holes with lunar soil manually or by machine, and the construction of the lunar module is completed and it can be put into use.

Claims

1. A preparation method of a foldable / unfoldable honeycomb structure lunar module, characterized in that: The method is as follows: Step 1: Prepare a ring-structured honeycomb element with a sheet as the base, and precisely divide and mark it; According to the honeycomb forming principle, connect the equally divided honeycomb elements with dislocation to obtain a hollow honeycomb structure; Step 2: Arrange heating resistance wires on the surface of the hollow honeycomb and reserve a power supply access port; Step 3: Spray viscous pre-cured epoxy resin on the surface of the hollow honeycomb structure, and cover an isolation film on the resin layer surface to obtain the lunar module skeleton; Step 4: Bond a flexible inflatable inner membrane to the inner surface of the fully deployed lunar module skeleton, and fold the honeycomb to obtain a honeycomb-structured lunar module in the launch state; Step 5: After launching the lunar module to a predetermined position, inflate the flexible inner membrane, deploy the lunar module, and energize it through the power supply inlet reserved in the honeycomb structure. Heat to cause the pre-cured epoxy resin to undergo secondary curing to complete the curing and shaping of the honeycomb-structured lunar module; Step 6: Fill the honeycombs on the surface of the cured honeycomb-structured lunar module with lunar soil to form a cosmic ray shielding layer and a heat insulation layer to complete the overall construction of the lunar module.

2. The preparation method of a foldable / unfoldable honeycomb structure lunar module according to claim 1, characterized in that: In Step 1, the sheet is one of an aluminum sheet, a stainless steel sheet, a PET sheet, an HTPE sheet, a PC sheet, a PVC sheet, a PP sheet, a PS sheet, an ABS sheet, a rubber sheet, a polymer film, paper, or an aramid paper; the ring-structured honeycomb element is a planar ring sheet.

3. The preparation method of a foldable / unfoldable honeycomb structure lunar module according to claim 1, characterized in that: In Step 1, the equal division mainly refers to the equal division of the planar sheet in the honeycomb element, and the marking mainly refers to the marking of the planar sheet in the honeycomb element; the connection is one or more of bonding, welding, fusion, riveting, and sewing.

4. The preparation method of a foldable / unfoldable honeycomb structure lunar module according to claim 1, characterized in that: In Step 2, the surface of the hollow honeycomb refers to the six inner wall surfaces of each hexagonal columnar hole; The arrangement refers to bending the resistance wire into a snake shape and pasting it on the surface of the hollow honeycomb.

5. The preparation method of a foldable / unfoldable honeycomb structure lunar module according to claim 1, characterized in that: In Step 3, the viscous pre-cured epoxy resin is a high-temperature curing epoxy system resin; the surface of the resin layer refers to the surface of the hollow honeycomb after spraying the resin; the isolation film is a polymer film with a smooth surface.

6. The preparation method of a foldable / unfoldable honeycomb structure lunar module according to claim 1, characterized in that: In Step 4, the flexible inflatable inner membrane is a polymer film with good flexibility and airtightness, and the folding is along the axial direction.

7. A method for preparing a foldable / unfoldable honeycomb structure lunar module according to claim 1, characterized in that: In Step 5, the secondary curing refers to heating and curing until complete curing.

8. The preparation method of a foldable / unfoldable honeycomb structure lunar module according to claim 1, characterized in that: In Step 5, the honeycombs on the surface of the lunar module refer to the hexagonal columnar holes formed by the lunar module skeleton and the flexible inner membrane, and lunar soil is filled into this space.

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