Film tensioning device based on shape memory polymer composite material and working method

Abstract

The invention discloses a thin film tensioning device based on a shape memory polymer composite material and a working method, and belongs to the technical field of deformation regulation and control of space flexible deployable structures. The film base band is made of a shape memory polymer composite material, the end part is connected with the end, the inner side of the end is provided with the end gum, the film base band and the outer side of the end are connected with the packaging layer, the heating element is arranged between the outer side of the film base band and the inner side of the packaging layer, and the heating element is connected with the power supply. The method comprises the following steps: mounting a tensioning device, and supplying power to a heating element on the ground according to a film loosening state; and after being heated, the film base band shrinks and returns to the initial state to tension the film. By means of the unique shape memory characteristic of the shape memory polymer composite material, the film base band can return to the initial state from the pre-stretching state under the power-on condition, so that the attached film is effectively tensioned, and the task execution precision and reliability are ensured.

Description

Technical Field

[0001] The invention relates to a film tensioning device based on a shape memory polymer composite material and a working method, belonging to the technical field of deformation regulation of a space flexible deployable structure. Background Art

[0002] Flexible deployable structures in space are usually composed of key components such as membranes, support trusses, and ropes. They are designed to remain compact and folded during launch to save space, and to autonomously unfold into large space structures after entering space. Among them, the performance of the membrane, as the main component of such structures, is directly related to the stability of the entire space structure and the accuracy of mission execution.

[0003] However, in practical applications, the membranes of flexible deployable structures in space (such as off-orbit sails and solar wings) often face complex and changeable space environment challenges after experiencing the extreme environment of the launch phase, entering orbit and serving in orbit for a period of time, especially the drastic changes in high and low temperatures and continuous stress. Under the combined effect of these environmental factors, the membrane is prone to relaxation, which is manifested as a significant reduction in the degree of tension. The relaxation of the membrane not only changes the original design of the space structure configuration, but may also cause a series of problems such as structural vibration and deformation accumulation, which in turn seriously affects the realization of key functions such as attitude control and energy collection of the spacecraft, and reduces the accuracy and reliability of mission execution.

[0004] Therefore, developing a device that can autonomously and intelligently sense, evaluate, and implement effective tensioning adjustments on the film in a flexible and deployable structure in space is of great significance for improving the stability of space structures, extending their on-orbit service life, and ensuring mission execution accuracy. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the present invention provides a film tensioning device based on a shape memory polymer composite material and a working method.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a film tensioning device based on shape memory polymer composite material, comprising an end, an end adhesive, a film base, a heating element, a packaging layer and a power supply line; the film base adopts a shape memory polymer composite material, and the ends of the film base are respectively connected to the corresponding end heads, and the inner side of each end head is fixed with the end adhesive, the outer side of the film base head and the outer sides of the two ends are fixedly connected with the packaging layer, and a heating element is fixed between the outer side of the film base head and the inner side of the packaging layer, and the heating element is connected to the power supply through the power supply line.

[0007] The inner side of the film base belt is provided with reinforcing ribs arranged in a crisscross pattern.

[0008] The film base band and the end head are integrally formed.

[0009] The connection between the film base belt and the corresponding end head is provided with a second reinforcing rib with an arc structure.

[0010] The number of the heating elements is 1-15, and the heating elements are connected in series or in parallel.

[0011] The material of the heating element is constantan wire or iron-chromium-aluminum alloy or nickel-chromium alloy or carbon fiber or graphene or carbon fiber or conductive ink.

[0012] The heating element adopts a straight line arrangement, a U-shaped arrangement, a Z-shaped arrangement, a diamond-shaped arrangement or an S-shaped arrangement.

[0013] The film base is a polygonal film structure, the number of sides of the polygon is 3-10, and the film base is correspondingly connected to at least two ends.

[0014] A working method of a film tensioning device based on a shape memory polymer composite material of the present invention comprises the following steps:

[0015] S1: Tensioning device installation

[0016] S101: Powering the heating element, holding the end to pre-stretch the film base tape in the initial state;

[0017] S102: After the film base belt is pre-stretched to the right position, the heating element is powered off, and the film base belt remains in the extended pre-stretched state;

[0018] S103: sticking each end to the surface of the film;

[0019] S2: After the space flexible deployable structure has been working on track for a period of time, the ground determines the relaxation state of the film according to the resistance change of the heating element 4 and supplies power to the corresponding heating element;

[0020] S3: After the film base is heated, it shrinks and returns to its initial state due to the shape memory effect, thereby tensioning the films on both sides to which the ends are attached.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention utilizes the unique shape memory property of the shape memory polymer composite material, which can restore the film base from the pre-stretched state to the initial state under power-on conditions, thereby achieving effective tensioning of the attached film and ensuring the accuracy and reliability of task execution.

[0023] 2. The present invention carefully designs the structural dimensions and materials of the film baseband so that it can be adapted to various tensioning devices with different tensioning force requirements. The highly customizable feature enables the present invention to meet the specific needs of different aerospace projects for the tensioning of space flexible deployable structural films.

[0024] 3. The present invention, through the design of the heating element, enables the heating temperature and heating times to be precisely adjusted according to actual needs, which not only helps to optimize energy utilization, but also effectively avoids damage to the material caused by overheating, ensuring the safety and stability of the tensioning process.

[0025] 4. The present invention monitors the resistance of the heating element to determine the strain of the film, thereby sensing and estimating the state of the film.

[0026] 5. The present invention has a simple structure and is easy to install, which reduces maintenance costs and operating difficulties. At the same time, its lightweight characteristics reduce the overall weight burden of the spacecraft, which is conducive to improving the efficiency and economy of space missions. The film of most space flexible deployable structures in the aerospace field can be tensioned and adjusted using the present invention, which increases the service life of the space flexible deployable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 yes Figure 1 Exploded diagram of

[0029] Figure 3 It is a schematic diagram of the deformation and recovery process of the tensioning device of the present invention;

[0030] Figure 4 It is a schematic diagram of the working process of the tensioning device of the present invention;

[0031] Figure 5 Schematic diagram of the connection relationship between the film base tape and various terminals, where (a) is two terminals, (b) is three terminals, and (c) is four terminals; DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] A film tensioning device based on shape memory polymer composite material, comprising an end 1, an end adhesive 2, a film base 3, a heating element 4, a packaging layer 5 and a power supply line 6; the film base 3 adopts a shape memory polymer composite material, and the ends of the film base 3 are respectively connected to the corresponding end 1, and the inner side of each of the end 1 is fixed with an end adhesive 2, and the end adhesive 2 can stick the tensioning device to the target tensioning position of the film; the outer side of the film base 3 and the outer sides of the two end 1 are fixedly connected to the packaging layer 5, and the heating element 4 is bonded and fixed between the outer side of the film base 3 and the inner side of the packaging layer 5, and the heating element 4 is welded to the power supply line 6 and connected to the power supply through the power supply line 6.

[0034] The inner side of the film base belt 3 is provided with reinforcing ribs 1 arranged in a crisscross pattern.

[0035] The film base band 3 and the terminal 1 are integrally formed.

[0036] The connection between the film base band 3 and the corresponding end head 1 is provided with a reinforcing rib 2 of an arc structure to improve the strength of the material transition.

[0037] The number of the heating elements 4 is 1-15, and the heating elements 4 are connected in series or in parallel and are energized in sequence to achieve multiple step-by-step tensioning of the tensioning device based on the shape memory polymer composite material.

[0038] The material of the heating element 4 is constantan wire or iron-chromium-aluminum alloy or nickel-chromium alloy or carbon fiber or graphene or carbon fiber or conductive ink.

[0039] The heating element 4 adopts a straight line arrangement, a U-shaped arrangement, a Z-shaped arrangement, a diamond-shaped arrangement, or an S-shaped arrangement.

[0040] The film base band 3 is a polygonal film structure, the number of sides of the polygon is 3-10, and the film base band 3 is correspondingly connected to at least two terminals 1.

[0041] A working method of a film tensioning device based on a shape memory polymer composite material of the present invention comprises the following steps:

[0042] S1: Tensioning device installation

[0043] S101: Powering the heating element 4, holding the end head 1 to pre-stretch the film base tape 3 in the initial state, the pre-stretching may be biaxial stretching, triaxial stretching, quadriaxial stretching, pentaaxial stretching, hexaaxial stretching, heptaxial stretching, octaaxial stretching, nine-axis stretching and ten-axis stretching;

[0044] S102: After the film base belt 3 is pre-stretched to the right position, the heating element 4 is powered off, and the film base belt 3 is kept in the extended pre-stretched state;

[0045] S103: sticking each terminal 1 to the surface of the film;

[0046] S2: After the space flexible deployable structure has been working on track for a period of time, the ground determines the relaxation state of the film according to the resistance change of the heating element 4 and supplies power to the corresponding heating element 4;

[0047] S3: After being heated, the film base tape 3 shrinks and returns to its initial state due to the shape memory effect, thereby tensioning the films on both sides to which the end head 1 is attached.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A film tensioning device based on a shape memory polymer composite material, characterized in that: The invention comprises an end (1), an end adhesive (2), a film base (3), a heating element (4), a packaging layer (5) and a power supply line (6); the film base (3) is made of a shape memory polymer composite material, the ends of the film base (3) are respectively connected to the corresponding end (1), the inner side of each end (1) is fixed with the end adhesive (2), the outer side of the film base (3) and the outer sides of the two ends (1) are fixedly connected with the packaging layer (5), and a heating element (4) is fixed between the outer side of the film base (3) and the inner side of the packaging layer (5), and the heating element (4) is connected to a power source via the power supply line (6).

2. A film tensioning device based on a shape memory polymer composite material according to claim 1, characterized in that: The inner side of the film base belt (3) is provided with reinforcing ribs arranged in a crisscross pattern.

3. The film tensioning device based on shape memory polymer composite material according to claim 1, characterized in that: The film base tape (3) and the end head (1) are integrally formed.

4. A film tensioning device based on a shape memory polymer composite material according to claim 1 or 3, characterized in that: A second arc-shaped reinforcing rib is provided at the connection between the film base band (3) and the corresponding end head (1).

5. The film tensioning device based on shape memory polymer composite material according to claim 1, characterized in that: The number of the heating elements (4) is 1-15, and the heating elements (4) are connected in series or in parallel.

6. The film tensioning device based on shape memory polymer composite material according to claim 1, characterized in that: The material of the heating element (4) is constantan wire or iron-chromium-aluminum alloy or nickel-chromium alloy or carbon fiber or graphene or carbon fiber or conductive ink.

7. A film tensioning device based on a shape memory polymer composite material according to claim 5 or 6, characterized in that: The heating element (4) adopts a straight-line routing mode, a U-shaped routing mode, a Z-shaped routing mode, a diamond-shaped routing mode, or an S-shaped routing mode.

8. The film tensioning device based on shape memory polymer composite material according to claim 1, characterized in that: The film base band (3) is a polygonal film structure, the number of sides of the polygon is 3-10, and the film base band (3) is correspondingly connected to at least two end heads (1).

9. A working method of a film tensioning device based on a shape memory polymer composite material according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1: Tensioning device installation S101: Power is supplied to the heating element (4), and the end head (1) is held to pre-stretch the film base tape (3) in an initial state; S102: After the film base belt (3) is pre-stretched to the right position, the heating element (4) is powered off, and the film base belt (3) remains in the extended pre-stretched state; S103: sticking each end (1) to the surface of the film; S2: After the space flexible deployable structure has been operating on track for a period of time, the ground determines the relaxation state of the film according to the resistance change of the heating element 4 and supplies power to the corresponding heating element (4); S3: After being heated, the film base tape (3) shrinks and returns to its initial state due to the shape memory effect, thereby tensioning the films on both sides to which the end head (1) is attached.

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