Dynamic flag display device based on shape memory material

Abstract

The invention relates to the technical field of deep space exploration, in particular to a dynamic flag display device based on a shape memory material, which comprises a flagpole, a flag surface and a shape memory alloy part, one end of the flag surface is connected with the flagpole, the shape memory alloy part is arranged on at least one side surface of the flag surface and extends in the flag surface, and the flag surface is arranged on the flag surface. The shape memory alloy part is used for driving the flag surface to be converted among different flag surface forms through self deformation under the temperature change, the flag surface forms comprise the folded state and the unfolded state, and the unfolded state comprises the state of multiple unfolded forms. According to the invention, dynamic display of the flag in a deep space environment can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of deep space exploration, and in particular to a flag dynamic display device based on shape memory material. BACKGROUND

[0002] The extreme characteristics of deep space environment, such as high vacuum, low air pressure, large temperature difference, and ubiquitous cosmic rays, have put unprecedentedly high requirements on the deployment of a flag and the realization of its dynamic display effect.

[0003] At present, the display of the flag in the deep space environment still mainly relies on mechanical devices. For example, in some related technologies, the flag surface is wound along the flagpole, and then the astronauts operate to deploy the flag surface, further pull the spring wire behind the flag surface, so that the flag floats like a wind on the moon surface without wind. However, the mechanical deployment device has the disadvantages of large mass, complex structure, easy to be damaged by impact, poor reliability and stability in the deep space environment, and cannot realize the dynamic display effect of the flag surface. SUMMARY

[0004] The present application aims to realize the dynamic display of the flag in the deep space environment.

[0005] To solve the above problems, as a first aspect, the present application provides a flag dynamic display device based on shape memory material, comprising a flagpole, a flag surface and a shape memory alloy part, one end of the flag surface is connected with the flagpole, the shape memory alloy part is arranged on at least one side surface of the flag surface and extends in the flag surface, the shape memory alloy part is used to drive the flag surface to convert between different flag surface morphologies by deforming itself under temperature change, the flag surface morphologies include a folded state and an unfolded state, and the unfolded state includes states of multiple unfolded forms.

[0006] Optionally, the material of the flagpole includes shape memory polymer, which is used to drive the flagpole to change from a flagpole folded state to a flagpole unfolded state by deforming itself under temperature change.

[0007] Optionally, the flagpole includes a body layer, a shape memory layer and a heating layer, the shape memory layer is arranged on the surface of the body layer, and the heating layer is arranged on the surface of the shape memory layer.

[0008] Optionally, the material of the body layer includes carbon fiber, and the material of the shape memory layer includes shape memory polymer.

[0009] Optionally, the end surface of the flagpole is in the shape of a pod pole, a “human” shape, a “C” shape or a “V” shape.

[0010] Optionally, the body layer comprises two oppositely arranged clamps, the flag surface is arranged between the two clamps, the flag surface is connected with at least one of the clamps, one end of the two clamps is connected with each other, and the other end of the two clamps has a space for accommodating the flag surface in the folded state.

[0011] Optionally, the distance between the two clamps gradually decreases from the middle to the two ends. Or, the distance between the two clamps gradually increases from the one end connected with each other to the other end. Or, the two clamps are integrally formed to form a "C" shape with the opening facing the flag surface.

[0012] Optionally, at least one of the clamps is provided with a flexible battery for supplying power to the shape memory alloy piece.

[0013] Optionally, the surface of the flag surface has a micro-nano structure layer.

[0014] Optionally, the micro-nano structure layer is made of super-hydrophobic material.

[0015] The beneficial effects of the present application compared with the related art include: The present application combines the shape memory alloy piece with the flag surface, the shape memory alloy piece can drive the unfolding of the flag surface and the conversion between different unfolding states through its own deformation, so as to realize the dynamic display effect of simulating the fluttering of the flag surface with the wind. Specifically, the shape memory alloy piece can extend along the length direction of the flag surface, the flag surface can be folded in the low temperature state of the shape memory alloy piece, then after the shape memory alloy piece is heated for the first time, the shape memory alloy piece returns to the straight state, realizing the unfolding of the flag surface. Then further temperature excitation is applied to the double-way shape memory alloy piece, which will deform to form other forms of unfolded state, and then the deformation will gradually recover, so as to realize the dynamic display of the flag surface through the alternating process. The flag dynamic display device of the present application has high storage ratio and light weight, can complete the horizontal unfolding of the flag surface in vacuum or rarefied atmosphere environment, and realize the dynamic display effect. The active recovery characteristics of the shape memory material make its structure simpler, weight lighter and energy consumption less compared with the motor or magnetic field driving mode; compared with the mechanical elastic driving mode, the unfolding process is controllable and the impact is small. Moreover, the dynamic display of the flag surface in the present application does not depend on the wind power or gravity, is suitable for vacuum and microgravity environment, and can be used in orbiting track. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic diagram of the flag dynamic display device in the unfolded state according to an exemplary embodiment of the present application; Figure 2 FIG. 2 is a structural schematic diagram of the flag dynamic display device in the dynamic display state according to an exemplary embodiment of the present application; Figure 3 Schematic diagram of the deformation principle of the shape memory alloy part in an exemplary embodiment of the present application; Figure 4 Schematic diagram of the low-temperature deployed state of the shape memory alloy part in an exemplary embodiment of the present application; Figure 5 Schematic diagram of the high-temperature deployed state of the shape memory alloy part in an exemplary embodiment of the present application; Figure 6 Schematic diagram of the flagpole structure in the shape of a bean pod in an exemplary embodiment of the present application; Figure 7 Schematic diagram of the end face of the flagpole and flag surface in the shape of a bean pod when being folded in an exemplary embodiment of the present application; Figure 8 Schematic diagram of the flagpole structure in the shape of a "human" in an exemplary embodiment of the present application; Figure 9 Schematic diagram of the end face of the flagpole and flag surface in the shape of a "human" when being deployed in an exemplary embodiment of the present application; Figure 10 Schematic diagram of the folding process of the flag surface in an exemplary embodiment of the present application; Figure 11 Schematic diagram of the folding process of the flagpole in an exemplary embodiment of the present application; Figure 12 Schematic diagram of the structure of the micro-nano structure layer in an exemplary embodiment of the present application; The flagpole; 11, the body layer; 111, the clamping piece; 12, the shape memory layer; 13, the heating layer; 14, the flexible battery; 2, the flag surface; 3, the micro-nano structure layer; 4, the shape memory alloy part. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below.

[0018] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present application; As used herein, the term "includes" and its variants are open-ended, meaning that "includes but is not limited to"; the term "based on" means "based, at least in part, on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optional" means "optional in at least some embodiments". Related definitions are given throughout the description. It is noted that the terms "first", "second", and the like, do not denote any order, quantity, combination or importance, but are used to identify different objects. In addition, the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise stated.

[0019] Shape memory materials are a class of functional materials that realize shape memory effect through thermal elastic martensitic phase transition. Such materials can automatically recover from a temporary shape to a pre-set permanent shape under external stimuli (such as temperature, light, electricity, magnetic field or solution pH change), even if severe plastic deformation has occurred. Shape memory materials mainly include shape memory alloys (such as nickel-titanium alloy) and shape memory polymers.

[0020] Among them, the shape memory characteristics of shape memory alloys are derived from the reversible phase transition of internal austenite and martensite crystal structure. According to different memory effects, the characteristics of shape memory alloys are divided into single, double and full effects. Among them, single effect refers to the shape memory phenomenon that shape memory alloys are deformed at a lower temperature and can recover to the original shape after heating, i.e. only in the heating process; double effect refers to the shape memory phenomenon that shape memory alloys are transformed into high-temperature phase shape when heated, and can recover to low-temperature phase shape when cooled; full effect refers to the shape memory phenomenon that shape memory alloys recover to high-temperature phase shape when heated, and are transformed into low-temperature phase shape with the same shape but opposite orientation when cooled.

[0021] Shape memory polymers are composed of a fixed phase that remembers the original shape and a temporary phase that solidifies or softens with temperature change. The fixed phase of shape memory polymers is determined by the chemical cross-linking (covalent bond) between polymer molecular chains. When the shape memory polymer is heated above its transition temperature, the polymer molecular chain segments become movable, but the chemical cross-linking points still exist. Under the action of external force, the molecular chains are straightened and reoriented. If the external force is maintained, the movement ability of the molecular chain segments is "frozen", and the temporary shape is fixed. When heated again above the transition temperature, the "frozen" molecular chain segments regain the ability to move to recover to the permanent original shape. Generally speaking, shape memory polymers only have single effect.

[0022] The embodiment of the present application provides a flag dynamic display device based on a shape memory material, referring to Figure 1 and Figure 2 , the flag dynamic display device comprises a flagpole 1, a flag surface 2 and a shape memory alloy piece 4, one end of the flag surface 2 is connected with the flagpole 1, the shape memory alloy piece 4 is arranged on at least one side surface of the flag surface 2 and extends in the flag surface 2, the shape memory alloy piece 4 is used for driving the flag surface 2 to convert between different flag surface morphologies by deforming itself under temperature change, the flag surface morphologies comprise a folded state and an unfolded state, and the unfolded state comprises states of multiple unfolded forms.

[0023] Specifically, Figure 1 and Figure 2 , B represents a back surface of the flag, and F represents a front surface of the flag. The embodiment of the present application can be used for dynamic display of the flag in a deep space environment such as the moon or Mars, and the fabric flag surface 2 can be knitted from Kevlar fiber, polyimide fiber, polyether ether ketone fiber, basalt fiber and the like. It should be understood that, referring to Figure 3 , based on the double-pass effect of the shape memory alloy piece 4, it can be changed into a temporary morphology by an external force at low temperature, and the temporary morphology is only a temporary morphology under the action of the external force, and after the next temperature rise / temperature drop, it will restore to the corresponding preset morphology. Therefore, by artificial pre-control, the shape memory alloy can present different set shapes at a specific temperature, thereby driving the flag surface 2 to dynamically convert between different unfolded states. For example, referring to Figure 4 and Figure 5 , the shape memory alloy piece 4 can be artificially pre-controlled to have two morphologies, wherein Figure 4 is a low-temperature unfolded state of the shape memory alloy piece 4, Figure 5 is a high-temperature unfolded state of the shape memory alloy piece 4. With the change of temperature, the shape memory alloy piece 4 can reversibly change between the two waveforms, further driving the flag surface 2 to convert between the two unfolded states, thereby realizing the display effect of the flag surface 2 flying in the wind. It should be noted that the shape memory alloy piece 4 can be in the shape of a wire, a sheet or a strip, and exemplarily, when the shape memory alloy piece 4 is in the shape of a wire, the diameter of the shape memory alloy wire is 0.1mm to 0.5mm. The shape memory alloy piece 4 can extend in a direction parallel to the length of the flag surface 2 or in a direction at an angle to the length direction of the flag surface 2, as long as it can drive the flag surface 2 to deform in three dimensions.

[0024] The embodiment of the present application realizes the dynamic display effect of simulating the flutter of the flag surface 2 by combining the shape memory alloy piece 4 with the flag surface 2, and the shape memory alloy piece 4 can drive the unfolding of the flag surface 2 and convert between different unfolding states by self-deformation. Specifically, the flag surface 2 can be folded in a zigzag or winding manner by an external force in the low-temperature state of the shape memory alloy piece 4, and then the shape memory alloy piece 4 is heated for the first time, and the shape memory alloy piece 4 returns to the straight state, realizing the unfolding of the flag surface 2. Then further temperature excitation is applied to the double-way shape memory alloy piece 4, which will deform, and the deformation will gradually recover after the temperature excitation is removed, so as to realize the dynamic display of the flag surface 2 by the alternating process. The flag dynamic display device of the present application has high storage ratio and light weight, can complete the horizontal unfolding of the flag surface 2 in a vacuum or rarefied atmosphere environment, and realize the dynamic display effect. The active recovery characteristics of the shape memory material make the structure simpler, the weight lighter, and the energy consumption less than the motor or magnetic field driving mode. Compared with the elastic driving mode, the unfolding process is controllable and the impact is small. Moreover, the dynamic display of the flag surface 2 in the present application does not depend on wind power or gravity, is suitable for vacuum and microgravity environment, and can be used in orbiting track.

[0025] In some optional embodiments, the shape memory alloy wire and the flag surface 2 can be connected and fixed by a shape memory alloy fastener, which is usually made of a material compatible with the shape memory alloy piece 4. The shape memory alloy piece 4 can also be fixed on the fabric flag surface 2 by sewing thread. In addition, a channel or sleeve can be sewn on the flag surface 2 in advance, and then the shape memory alloy piece 4 is inserted into the channel or sleeve. This method allows the shape memory alloy piece 4 to move freely and is convenient for further replacement. In addition, the shape memory alloy piece 4 can also be clamped between two layers of flag surface 2, or arranged on the surface of the flag surface 2 according to the designed path, and then fused with the flag surface 2 by heating and pressing. Specifically, a layer of hot melt adhesive film (such as TPU film) can be covered on the surface of the shape memory alloy piece 4, and then a hot press or iron (the temperature needs to be strictly controlled) is used for pressing and ironing to melt the adhesive film. After cooling, the shape memory alloy piece 4 is firmly packaged between the two layers of flag surface 2 or on the surface of the flag surface 2.

[0026] In some optional embodiments, the number of shape memory alloy pieces 4 is at least two groups, and the two groups of shape memory alloy pieces 4 are arranged at intervals along the width direction of the flag surface 2. It should be understood that the at least two groups of shape memory alloy wires can be distributed on the same surface of the flag surface 2, or can be distributed on the two surfaces of the flag surface 2 in an equal or unequal division manner, and the interval between the adjacent two shape memory alloy pieces 4 can be 10mm to 50mm. In an exemplary embodiment, referring to Figure 1 and Figure 2 , Figure 1 and Figure 2Meanwhile, the front and back of the flag surface 2 are shown schematically, and the number of shape memory alloy pieces 4 is two groups, both of which extend parallel to the length direction of the flag surface 2 and are uniformly spaced along the width direction of the flag surface 2. In order not to affect the display effect of the flag, both groups of shape memory alloy pieces 4 can be distributed on the back of the flag surface 2, i.e., the side away from the flag pattern.

[0027] Further, when the number of shape memory alloy pieces 4 is multiple groups, in order to more realistically display the fluttering effect of the flag, the multiple groups of shape memory alloy pieces 4 can be designed to have different lengths and shapes according to their respective positions, i.e., the heating / cooling temperature of each group of shape memory alloy pieces 4 and its corresponding waveform do not have to be the same. Repeated heating and cooling of each group of shape memory alloy pieces 4 can achieve its unique elongation, shortening, and shape change, thereby achieving the fluttering effect of the flag surface 2. For example, for the shape memory alloy pieces 4 at the top of the flag surface 2, the design can be to elongate at high temperature and shorten at low temperature, with an extension / contraction size range of 1 to 20 mm, which can be adjusted according to the fluttering display effect; for the shape memory alloy pieces 4 at other positions, the shapes at high and low temperatures can be similar to the sine wave shown in Figure 4 and Figure 5 The specific waveform pattern can also be adjusted according to the fluttering effect to achieve the best dynamic display effect of the flag surface 2, thereby being closer to the real scene of the ground flag fluttering in the wind.

[0028] In some optional embodiments, the material of the shape memory alloy piece 4 can be ternary nickel-titanium-niobium alloy, which specifically includes the following mass percentages of elements: 43.5% to 46% titanium, 43.5% to 46% nickel, and 8% to 13% niobium.

[0029] In some optional embodiments, the shape memory alloy piece 4 can be heated by being energized. Meanwhile, a small control device can be further provided in the flagpole 1 to control the specific energization and de-energization time of the shape memory alloy piece 4, so as to better control the display effect of the flag surface 2.

[0030] In some optional embodiments, the material of the flagpole 1 includes shape memory polymer, which is used to deform by itself under temperature change to drive the flagpole 1 to change from the flagpole retracted state to the flagpole expanded state.

[0031] Further, in an exemplary embodiment, as Figure 7 and Figure 9As shown, the flagpole 1 comprises a body layer 11, a shape memory layer 12 and a heating layer 13, the shape memory layer 12 is arranged on the surface of the body layer 11, and the heating layer 13 is arranged on the surface of the shape memory layer. It should be noted that the shape memory layer 12 and the heating layer 13 can be distributed only on part of the surface of the body layer 11. The material of the body layer 11 can be selected from carbon fiber particles, chopped carbon fibers or continuous carbon fibers, such as carbon fiber reinforced prepreg, the material of the shape memory layer 12 can be selected from epoxy, cyanate ester or polyaryletherketone and other shape memory polymers; the heating layer 13 can be a temperature-adjustable electric heating element such as PTC heating sheet. The body layer 11 and the shape memory layer 12 can be integrally prepared, and the heating layer 13 can be connected with the body layer 11 and the shape memory layer 12 by high-temperature-resistant adhesive tape.

[0032] It should be noted that the heating temperature of the flagpole 1 should be determined according to the glass transition temperature of the shape memory polymer, and the heating temperature should be higher than the glass transition temperature. For example, when the material of the shape memory layer 12 is epoxy shape memory polymer, the glass transition temperature range is 60-180℃; the glass transition temperature range of cyanate ester shape memory polymer is 180-220℃; the glass transition temperature range of polyaryletherketone shape memory polymer is 130-200℃.

[0033] Specifically, referring to Figures 6 to 9 As shown, the end of the flagpole 1 can be in the shape of a pod-shaped pole, a "human" shaped pole, a "C" shaped pole, a "V" shaped pole, etc. Of course, the flagpole 1 can also be a solid round pole or a solid square pole.

[0034] Referring to Figure 7 As shown, in some optional embodiments, the body layer 11 of the flagpole 1 comprises two oppositely arranged clamping pieces 111, and the flag surface 2 is clamped between the two clamping pieces 111. The flag surface 2 is connected with at least one clamping piece 111, one end of the two clamping pieces 111 is connected with each other, and the other end of the two clamping pieces 111 has a space for accommodating the flag surface 2 in the retracted state.

[0035] Specifically, in actual production and installation, a hole can be reserved on one of the clamping pieces 111 of the flagpole 1, and a hole can also be reserved on the side of the flag surface 2 close to the flagpole 1. Then, the flag surface 2 is clamped between the two clamping pieces, and the flag surface 2 is fixed with the clamping pieces 111 through the flexible locking piece. In the satellite launching stage, the flag surface 2 in the embodiment can be folded into the flagpole 1, further reducing the size of the entire device. At the same time, the clamping pieces 111 of the flagpole 1 can also play a protective role for the flag surface 2 in the folded state, avoiding the pollution of the flag surface 2 by external dust and other impurities. In the flag display stage, the flag surface 2 is released from the inside of the flagpole 1 to the outside space of the flagpole 1 under the action of the shape memory alloy piece 4. Since a part of the end of the flag surface 2 is still in the flagpole 1, the flagpole 1 can limit the flag surface 2, improving the stability of the flag surface 2 in the dynamic display process.

[0036] As an option, the distance between the two clamping pieces 111 can gradually decrease from the middle to both ends, thereby forming a pod-shaped pole. The pod-shaped pole has strong geometric stability and stronger shape recovery capability, which is conducive to making the deformation effect more stable. Of course, the distance between the two clamping pieces 111 can also gradually increase from one end connected to the other end, thereby forming a “human” shape or a “V” shape with the opening facing the flag surface 2. Alternatively, the two clamping pieces 111 can be integrally formed, thereby forming a “C” shape with the opening facing the flag surface 2. The “human” shape, the “V” shape, and the “C” shape of the flagpole 1 have smaller storage volume than the pod-shaped pole.

[0037] In some optional embodiments, at least one clamping piece 111 is also provided with a flexible battery 14, which is used to supply power to the shape memory alloy piece 4. As an option, the flexible battery 14 can be distributed on one of the surfaces of the two clamping pieces 111 close to each other. The flexible battery 14 can also be connected with the clamping piece 111 through a high-temperature-resistant adhesive tape. The flexible battery 14 can form a conductive loop with each shape memory alloy piece 4, respectively, so as to change the temperature of the shape memory alloy piece 4 by supplying power to it.

[0038] As a whole, the flag display device is in a folded state in the satellite launching stage, and the display device is folded and compressed on the satellite cabin plate. Specifically, referring to Figure 10 and Figure 11As shown, in the initial state, the shape memory alloy piece 4 on the surface of the flag surface 2 is straightened at low temperature, so that the flag surface 2 is in a flat and unfolded state, and then the flag surface 2 is folded along the long edge multiple times by an external force until the flag surface 2 abuts against the flagpole 1. Then the flagpole 1 is powered and heated to above its glass transition temperature, and the flagpole 1 is folded in a Z-shaped or coiled manner, thereby driving the flag surface 2 to fold and gather. At this time, the folded state is maintained and the power is turned off until it is cooled to room temperature. After the external force constraint is removed, the shape memory flagpole 1 remains in the folded state, and the flag surface 2 is gathered and folded. After the satellite is launched into orbit, the shape memory flagpole 1 is first heated to restore it from the folded state to the unfolded flat state. Then the shape memory alloy piece 4 is heated, and the shape memory alloy piece 4 starts to transform to the preset high-temperature shape, driving the flag surface 2 to unfold. After cooling to the low-temperature state, the flag surface 2 transforms to the shape corresponding to the low-temperature state. Through repeated heating / cooling, the dynamic display effect of the flag surface 2 is realized.

[0039] In some optional embodiments, with reference to Figure 12 As shown, the surface of the flag surface 2 also has a micro-nano structure layer 3. Specifically, the micro-nano structure layer 3 can include a plurality of protrusions or grooves, the height of the protrusions or grooves is 0.1 to 1 μm, and the distance between two adjacent protrusions or grooves is 1 to 5 μm. The micro-nano structure layer 3 can be prepared by photolithography. For the flag surface 2 with low dust prevention requirements, other methods such as template method, self-assembly method, and deposition method can also be selected.

[0040] Specifically, the micro-nano structure layer 3 can be a transparent super-hydrophobic material located on the surface of the fabric flag surface 2, which can be distributed on the side of the flag surface 2 away from the shape memory alloy piece 4. The surface of the super-hydrophobic micro-nano structure layer 3 has a large contact angle (≥160°), so that the dust adhesion is low and it is not easy to adhere to the flag surface 2, and it is easy to be affected by external force and fall off from the surface, having a strong dust prevention effect. A small number of dust that cannot fall off by itself can also fall off during the dynamic deformation of the flag surface 2, achieving a deep cleaning effect, so that the clear display of the pattern of the flag surface 2 in the extreme deep space environment such as Mars dust can be better achieved.

[0041] In some optional embodiments, the material of the micro-nano structure layer 3 can include nano-silicon dioxide. For example, the micro-nano structure layer 3 can be prepared according to the following process: First, the nano-SiO2 is modified: 1 g of nano-SiO2 is dispersed in 50 ml of anhydrous ethanol, and after a series of uniform stirring, it is raised to 65°C, while a small amount of hexamethyldisilazane (HDMS) and 4 to 5 drops of dibutyltin dilaurate are added, heated to reflux, centrifuged, and finally modified by washing and drying.

[0042] Then the self-cleaning surface coating is prepared: tetraethyl orthosilicate and catalyst are mixed in a mass ratio of 7:3 to prepare a sol, 1 g of modified SiO2 is dispersed in 80 ml of anhydrous ethanol to obtain a dispersion liquid, then 1.5 g of the sol is added to the dispersion liquid to obtain a SiO2 sol; at the same time, 10 g of polydimethylsiloxane (PDMS) is added to 10 ml of anhydrous ethanol and ground to obtain a PDMS dispersion liquid. The PDMS dispersion liquid and the SiO2 sol are mixed in a ratio of 1:6 to obtain a SiO2-PDMS coating solution. Finally, the SiO2-PDMS coating solution is spin-coated on the flag surface 2 to form a self-cleaning surface coating. Preferably, the thickness of the self-cleaning surface coating is not more than 1 μm.

[0043] Formation of micro-nano structure: using a femtosecond laser system, the self-cleaning surface coating is divided into square small grids with a side length of 50 nm in a grid shape, and a 10 nm high inverted triangular trench is cut at the division line using a laser, thereby completing the preparation of the micro-nano structure layer 3.

[0044] The micro-nano structure layer 3 in the embodiment of the present application has good ductility. In the process of heating the shape memory alloy part 4, the micro-nano structure layer 3 has the advantages of small thickness, light transmission, strong coating adhesion, strong wear resistance, strong flexibility and good tensile properties, so that the fabric flag surface 2 will not be damaged in the reciprocating deformation process.

[0045] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A dynamic flag display device based on shape memory material, characterized in that: The invention comprises a flagpole (1), a flag (2) and a shape memory alloy component (4), wherein one end of the flag (2) is connected to the flagpole (1), the shape memory alloy component (4) is arranged on at least one side surface of the flag (2) and extends inside the flag (2), and the shape memory alloy component (4) is used to drive the flag (2) to switch between different flag shapes by deforming itself under temperature changes, wherein the flag shapes include a folded state and an unfolded state, and the unfolded state includes a plurality of unfolded forms.

2. The flag dynamic display device based on shape memory material according to claim 1 is characterized in that: The material of the flagpole (1) includes a shape memory polymer, and the shape memory polymer is used to deform itself under temperature changes to drive the flagpole (1) to change from a folded state to an extended state.

3. The flag dynamic display device based on shape memory material according to claim 2, characterized in that: The flagpole (1) comprises a body layer (11), a shape memory layer (12) and a heating layer (13); the shape memory layer (12) is arranged on the surface of the body layer (11); and the heating layer (13) is arranged on the surface of the shape memory layer (12).

4. The flag dynamic display device based on shape memory material according to claim 3 is characterized in that: The material of the body layer (11) includes carbon fiber, and the material of the shape memory layer (12) includes shape memory polymer.

5. The flag dynamic display device based on shape memory material according to claim 3 is characterized in that: The end face of the flagpole (1) is in the shape of a peapod, a "human", a "C" or a "V".

6. The flag dynamic display device based on shape memory material according to claim 5, characterized in that: The main body layer (11) comprises two oppositely arranged clips (111), the flag (2) is sandwiched between the two clips (111), the flag (2) is connected to at least one of the clips (111), one end of the two clips (111) is connected to each other, and a space for accommodating the flag (2) in a folded state is provided between the other ends of the two clips (111).

7. The flag dynamic display device based on shape memory material according to claim 6, characterized in that: The distance between the two clips (111) gradually decreases from the middle to the two ends; Alternatively, the distance between the two clips (111) gradually increases from one end connected to the other end; Alternatively, the two clips (111) are integrally formed to form a "C" shape with the opening facing the flag (2).

8. The flag dynamic display device based on shape memory material according to claim 6, characterized in that: A flexible battery (14) is provided on at least one of the clips (111), and the flexible battery (14) is used to supply power to the shape memory alloy component (4).

9. The flag dynamic display device based on shape memory material according to claim 1, characterized in that: The surface of the flag (2) has a micro-nano structure layer (3).

10. The flag dynamic display device based on shape memory material according to claim 8, characterized in that: The micro-nano structure layer (3) is made of super-hydrophobic material.

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