Device and method for generating film folds in thermal environment

Abstract

The invention belongs to the technical field of film wrinkle research, and relates to a film wrinkle generation device and method in a thermal environment. The device comprises a support frame, a displacement loading module and a non-contact heating module, the supporting frame comprises a base and a vertical rod. The displacement loading module comprises a vertical guide rail, a transverse guide rail, a first horizontal supporting rod and a second horizontal supporting rod; a vertical sliding block is arranged on each vertical guide rail and is divided into an upper sliding block and a lower sliding block; the two ends of the first horizontal supporting rod are connected to the two upper sliding blocks correspondingly, and the two ends of the second horizontal supporting rod are connected to the two lower sliding blocks correspondingly. The transverse guide rail is fixed to the first horizontal supporting rod, and a transverse sliding block is arranged on the transverse guide rail. The first horizontal supporting rod and the second horizontal supporting rod are respectively connected with a thin film connecting sheet for clamping a thin film test piece; and a transverse positioning block is arranged on the transverse guide rail and is used for controlling the transverse displacement of the film. The problem that an existing experiment cannot accurately simulate the real situation of film wrinkle generation is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of film wrinkle research, and in particular relates to a device and method for generating film wrinkles in a thermal environment. Background Art

[0002] As an important component of deployable structures in space, membrane structures have attracted widespread attention in recent years due to their light weight, easy folding, low cost, and rapid deployment. However, the bending stiffness of membranes is low, and even small compressive stress will cause membrane wrinkles. For flexible membrane structures in space, wrinkles will not only affect the surface accuracy, but also change the stress distribution in the membrane, and the stiffness matrix will also change accordingly, thereby changing the dynamic characteristics of the structure.

[0003] Temperature changes in the space environment have been identified as one of the factors that affect the shape accuracy of thin film structures. Many scholars have studied the wrinkling characteristics of thin films in thermal environments theoretically and numerically, but few scholars have studied the influence of temperature effects on the wrinkle patterns of thin films experimentally. For example, Blandina et al. studied the wrinkling behavior of Kapton square membranes under tension-thermal loads experimentally and numerically, but did not explain why temperature changes would affect wrinkle deformation. Gao et al. obtained the out-of-plane deformation of square and circular films heated from room temperature to 170°C under fixed boundary conditions through numerical simulation and experimental research. The results showed that the film changed from global buckling to local buckling at the beginning, accompanied by wrinkle formation, and the wrinkle pattern continued to evolve at higher temperatures.

[0004] In summary, the current experimental research on the wrinkling behavior of films under heat is basically carried out on films with tensile loads or fixed effects on the boundaries, and rarely involves films subjected to shear displacement loads. In addition, the methods of applying temperature changes to films in the literature are basically through a separate heating device, and then heating the film from the front or top of the film through a separate heating device at a distance. Since the radiation heating effect decreases rapidly with the increase of distance, if the temperature of the film surface is increased, the temperature of the entire space formed by the film and the heating device will be too high, which will not only make the film loading device easy to deform, but also make it impossible to artificially change the boundary conditions of the film, limiting the application of the film wrinkle generation device. In addition, the method of heating the film from the front or top of the film at a distance will cause the problem of reflection on the wrinkled surface, which is not conducive to the detection of the wrinkle deformation characteristics of the film surface by measuring equipment such as binocular cameras. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for generating film wrinkles in a thermal environment, which can not only apply various displacement loads such as tension and shear, but also simultaneously apply temperature loads, thereby solving the problem that existing experiments cannot accurately simulate the actual situation of film wrinkle generation. The present invention is achieved through the following technical solutions: The present invention also discloses a film wrinkle generating device in a thermal environment, comprising a support frame, a displacement loading module and a non-contact heating module; The displacement loading module is installed on one side of the support frame, and the non-contact heating module is movably installed on the other side of the support frame; The support frame includes a base and two parallel vertical rods, and the vertical rods are fixed on the base; The displacement loading module includes a vertical guide rail, a transverse guide rail, a first horizontal support rod and a second horizontal support rod; two vertical guide rails are provided, which are respectively installed on two vertical rods; a vertical slider is provided on each vertical guide rail, and the vertical slider is divided into an upper slider and a lower slider; The two ends of the first horizontal support rod are respectively connected to the two upper sliders, and the two ends of the second horizontal support rod are respectively connected to the two lower sliders; Slider clamps are provided at both the upper slider and the lower slider; The transverse guide rail is fixed on the first horizontal support rod, and a transverse sliding block is provided on the transverse guide rail; The first horizontal support rod and the second horizontal support rod are respectively connected with film connecting pieces, and the two film connecting pieces are used to clamp the film test piece; A transverse positioning block is provided on the transverse guide rail to limit the horizontal position of the transverse slider and control the transverse displacement of the film.

[0006] Furthermore, a vertical positioning block is provided at the bottom of the front side of the vertical rod, and the vertical positioning block is fixed to the vertical rod by bolts.

[0007] Furthermore, a vertical slider protection plate is arranged on the top of the front side of the vertical rod, and the vertical slider protection plate is fixed to the vertical rod by bolts.

[0008] Furthermore, the non-contact heating module includes a support beam, a support rod and a heating component. The heating component is fixed on two parallel support beams. The two sections of each support beam are connected to the support rod, and the support rod is bolted to the vertical rod.

[0009] Furthermore, the heating assembly is composed of multiple sets of quartz lamp heating modules, each set of quartz lamp heating modules is controlled by a temperature controller, and is individually regulated according to the real-time temperature of the film fed back by the thermocouple module.

[0010] Further, the base includes two Y-direction transverse rods and one X-direction transverse rod; The X-direction transverse rod is located in the horizontal direction, connecting two parallel Y-direction transverse rods, and the two vertical rods are vertically connected to the two Y-direction transverse rods respectively.

[0011] Furthermore, the first horizontal support rod includes a connecting rod in the middle and connecting blocks on both sides, the connecting blocks on both sides are fixed on the vertical sliding blocks, and the transverse guide rails are installed on the connecting rod.

[0012] Further, the transverse positioning block is bolted to the transverse guide rail; A set screw is connected through the upper end of the transverse positioning block, and the set screw is used to drive the transverse positioning block to move horizontally and limit the horizontal position of the transverse sliding block.

[0013] The present invention also discloses a film wrinkle generation method based on the film wrinkle generation device under a thermal environment, comprising the following process: Remove the two film connecting sheets and clamp the film test piece between the two film connecting sheets; Fix one of the film connecting pieces to the transverse slider, and then lock the upper slider position of the vertical slider by using the slider clamp to lock the position of the upper boundary of the film test piece; Fix another film connecting piece to the second horizontal support rod, the position of the lower slider is not locked temporarily, and the lower boundary of the film is in a natural sagging state according to gravity; On the premise of ensuring that the surface of the film test piece is as flat as possible, the lower boundary of the film is locked by fixing the position of the lower slider with a slider clamp; Adjust the position of the lateral positioning block to move the two lateral sliders, thereby driving the upper film connecting piece to produce displacement changes along the X direction, thereby causing the upper boundary of the film to produce lateral shear displacement and generate wrinkles; Turn on the heating component, and when the film reaches the specified temperature, observe the changes in the wrinkles of the film test piece.

[0014] The present invention also discloses a method for measuring the thermal expansion coefficient of a film based on the film wrinkle generating device under a thermal environment, comprising the following process: Remove the two film connecting sheets and clamp the film test piece between the two film connecting sheets; Fix one of the film connecting pieces to the transverse slider, and then lock the upper slider position of the vertical slider by using the slider clamp to lock the position of the upper boundary of the film test piece; Fix another film connecting piece to the second horizontal support rod, and temporarily unlock the position of the lower slider to keep the lower edge of the film in a natural sagging state; Start heating the thin film test piece. When the thin film test piece stabilizes to a specified temperature, stop heating and calculate the vertical displacement cloud diagram of the thin film after thermal expansion. The thermal expansion coefficient of the film is calculated by the formula:

[0015] in, and are the vertical displacements of two points on the film, is the initial distance between two points on the film, is the temperature difference between room temperature and the specified temperature; When taking the points, the two points on the film are located on the same vertical line.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a device for generating film wrinkles in a thermal environment, which combines a loading module with a heating module for the first time. The position of the heating module can be changed with the size and position of the film by adjusting the bolts, thereby ensuring the heating effect. In addition, the loading module can not only apply a tensile displacement load in the vertical direction, but also apply a horizontal displacement load in the X direction to the upper boundary of the film, that is, a shear displacement load. The lateral displacement of the film is controlled by a positioning block + positioning screw, which has a simple structure and is easy to operate, and can meet the adjustment requirements of small displacements.

[0017] Compared with the previous film wrinkle generation device under thermal environment, the guide rail slider mechanism is used as the vertical displacement generation mechanism. When the position of the lower slider is not locked, the film test piece naturally sags and is tensioned due to the gravity of the connecting plate and the second horizontal support rod, and there is no need to ensure the pre-tensioning of the film by applying a tensile load. More importantly, the current literature only considers heating the film wrinkles, and all of them adopt fixed boundaries or consider applying tension to the boundaries, and then heating. There is no way to retain the thermal elongation caused by heating, so these schemes cannot measure the thermal expansion coefficient of the film. In the present invention, when the film expands due to heat, this movement mode can retain the thermal elongation of the film, so that the device can successfully measure the thermal expansion coefficient of the film.

[0018] Furthermore, the heating module is integrally fixed on the vertical rod, and the heating assembly is composed of multiple sets of quartz lamp heating modules, each set of quartz lamp heating modules is controlled by a thermostat, and is individually regulated according to the real-time temperature of the film fed back by the thermocouple module to ensure that the film is heated evenly. It can also adapt to films of different sizes, and the number of quartz lamp heating modules can be flexibly used according to the size of the film.

[0019] The present invention also discloses a method for generating wrinkles in a film under a thermal environment. Compared with the methods in the literature, this method can not only change the boundary conditions and stress state of the film by controlling the stretching, shear displacement and thermal load, but also realize the regulation of the wrinkles of the film.

[0020] In addition, the present invention also discloses a method for testing the thermal expansion coefficient of a film based on the wrinkle generating device. Compared with the traditional measurement method based on a dynamic thermal analyzer, this method is not only simple, but also can more accurately measure the thermal expansion coefficient of the film under the thermal environment provided by the device of the present invention, thereby better understanding the wrinkle behavior of the film under the thermal environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a film wrinkle generating device under a thermal environment of the present invention; Figure 2 It is a schematic diagram of the structure of the support frame part of the generating device of the present invention; Figure 3 It is a schematic diagram of the structure of the displacement loading module of the generating device of the present invention; Figure 4 This is a schematic diagram of the structure of the lateral displacement loading part of the generating device of the present invention. Figure 5 It is a schematic diagram of the first horizontal support rod part of the displacement loading module of the present invention; Figure 6 It is a schematic diagram of the heating module structure of the generating device of the present invention.

[0022] In the figure: 1, support frame; 2, displacement loading module; 3, non-contact heating module; 4, vertical rod; 5, Y-axis horizontal rod; 6, X-axis horizontal rod; 7, vertical positioning block; 8, vertical slider protection plate; 9, support angle code; 10, vertical guide rail; 11, vertical slider; 12, horizontal guide rail; 13, horizontal slider; 14, set screw; 15, horizontal positioning block; 16, first horizontal support rod; 17, second horizontal support rod; 18, slider clamp; 19, film connecting piece; 20, film test piece; 21. Support beam; 22. Support rod; 23. Angle code; 24. Heating assembly; 161. Connecting rod; 162. Connecting block. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, not all embodiments.

[0024] The components described and shown in the drawings and embodiments of the present invention may be arranged and designed in various configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] It should be noted that the terms "comprises", "includes" or any other variants are intended to cover non-exclusive inclusion, so that a process, element, method, article or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to the process, element, method, article or device. In addition, the terms "horizontal" and "vertical" are based on the orientation and positional relationship of the devices or components shown in the drawings, and are only for the purpose of better describing the present invention, rather than requiring the devices, components or equipment shown to have this specific orientation, and therefore cannot be understood as limiting the present invention.

[0026] The features and performances of the present invention are further described in detail below in conjunction with the embodiments.

[0027] The purpose of the present invention is to provide a device that can achieve film heating and wrinkling, which is used to experimentally study the influence of temperature effect on the wrinkling characteristics of the film under shear displacement load, and to provide corresponding technical support for accurately predicting the surface accuracy of the spatially deployable film structure. The specific technical solution is as follows: like Figure 1 As shown, the film wrinkle generating device designed in the present invention under a thermal environment mainly includes three parts, namely a support frame 1, a displacement loading module 2 and a non-contact heating module 3.

[0028] like Figure 2 As shown, the support frame 1 includes two vertical rods 4, two Y-direction transverse rods 5, and one X-direction transverse rod 6. The X-direction transverse rod 6 is located in the horizontal direction, connecting two parallel Y-direction transverse rods 5, and the two vertical rods 4 are respectively vertically connected to the two Y-direction transverse rods 5, forming a support frame 1 with stability.

[0029] Preferably, a displacement loading module 2 is installed on the front of the vertical rod 4, a vertical positioning block 7 is provided at the bottom of the front of the vertical rod 4, a vertical slider protection plate 8 is provided at the top, and the vertical positioning block 7 and the vertical slider protection plate 8 are fixed to the vertical rod 4 by bolts. The vertical positioning block 7 is used to position and support the vertical guide rail 10 to prevent the vertical guide rail 10 from moving downward along the vertical rod 4 due to gravity.

[0030] More preferably, support angle codes 9 are provided at the connection points of the vertical rod 4 , the Y-direction transverse rod 5 , and the X-direction transverse rod 6 , and the vertical rod 4 is fixed together with the Y-direction transverse rod 5 and the X-direction transverse rod 6 by the support angle codes 9 .

[0031] like Figure 3 As shown, the displacement loading module 2 mainly includes two vertical guide rails 10, four vertical sliders 11, a transverse guide rail 12, two transverse sliders 13, two set screws 14, two transverse positioning blocks 15, a first horizontal support rod 16, a second horizontal support rod 17, eight slider clamps 18, two film connecting plates 19 and a film test piece 20.

[0032] The vertical guide rail 10 is fixed to the vertical rod 4 by bolts, and the vertical slider 11 is installed on the vertical guide rail 10 . The positions of all the vertical sliders 11 are locked by the slider clamp 18 installed on the vertical guide rail 10 .

[0033] The connection between the lateral positioning block 15 and the set screw 14 is as follows: Figure 4 As shown, Figure 4 As shown in FIG. 2 , the lateral positioning block 15 is fixed to the lateral guide rail 12 through two threaded holes on the back; the set screws 14 are connected together through the through threaded holes on the lateral positioning block 15. When the set screws 14 are manually rotated, the lateral positioning block 15 can move horizontally along the X direction.

[0034] The specific structure of the first horizontal support rod 16 is as follows Figure 5 As shown, it includes an elongated connecting rod 161 in the middle and connecting blocks 162 on both sides. The connecting blocks 162 on both sides are fixed on the vertical slider 11, while the transverse guide rail 12 is installed on the connecting rod 161, and the transverse slider 13 is installed on the transverse guide rail 12.

[0035] More preferably, transverse positioning blocks 15 are fixed to both ends of the connecting rod 161 by means of set screws 14 to limit the horizontal position of the transverse sliding block 13 .

[0036] The second horizontal support rod 17 is fixed to the lower vertical slider 11 by bolts. The first horizontal support rod 16 is arranged in parallel with the second horizontal support rod 17, and forms a rectangular connection frame with the vertical guide rails 10 on both sides.

[0037] In addition, the upper and lower sides of the film test piece 20 are fixed by two film connecting pieces 19 respectively, and the film connecting pieces 19 are respectively connected to the first horizontal support rod 16 and the second horizontal support rod 17 by bolts.

[0038] The vertical slider 11 drives the upper and lower boundaries of the film test piece 20 to move vertically through the first horizontal support rod 16 and the second horizontal support rod 17. When the vertical slider 11 needs to be stationary, the slider clamp 18 can lock the position of the upper and lower sliders of the motion module. The transverse slider 13 drives the upper boundary of the film to move horizontally along the transverse guide rail 12, and the position of the set screw 14 of the transverse positioning block 15 can be adjusted, so that it does not hinder and can lock the position of the slider relative to the transverse guide rail 12.

[0039] The non-contact heating module 3 is connected to the back of the vertical rod 4 and is located on one side of the thin film test piece 20. Figure 6 As shown, the non-contact heating module 3 specifically includes a support beam 21, a support rod 22, an angle code 23 and a heating component 24. The heating component 24 is fixed on two parallel support beams 21. The two sections of each support beam 21 are connected to the support rod 22 as a whole, and then bolted to the vertical rod 4 through the angle code 23, and the heating component 24 is fixed to the support beam 21 by bolts.

[0040] The heating assembly 24 is specifically composed of a plurality of quartz lamp heating modules, wherein each quartz lamp heating module is controlled by a temperature controller, and can be individually regulated according to the real-time temperature of the film fed back by the thermocouple module, thereby achieving uniform heating of the film.

[0041] Example 1 A method for generating wrinkles in a film under a thermal environment of the present invention is implemented as follows: 1) The upper slider position of the vertical slider 11 is locked by the slider clamp 18, while the lower slider position is temporarily unlocked, and the lower boundary of the film is in a natural drooping state according to gravity.

[0042] 2) Under the premise of ensuring that the surface of the film test piece 20 is as flat as possible, the lower boundary of the film is locked by fixing the position of the lower slider by the slider clamp 18; 3) The left set screw 14 is used to cause the transverse slider 13 to change its displacement in the X direction, thereby causing a transverse shear displacement on the upper boundary of the film and generating wrinkles.

[0043] 4) Turn on the heating assembly 24, and when the film reaches a specified temperature, observe changes in the wrinkles of the film test piece 20.

[0044] Example 2 The present invention also discloses a method for testing the thermal expansion coefficient of a film based on the wrinkle generating device, which includes the following process: 1) The upper slider position of the vertical slider 11 is locked by the slider clamp 18, and the lower slider position is temporarily unlocked to keep the lower edge of the film in a natural drooping state; 2) Start heating the film. When the specimen stabilizes to the specified temperature, stop heating and calculate the vertical displacement cloud diagram of the film after thermal expansion; 3) Calculate the thermal expansion coefficient of the film by the formula:

[0045] in, and are the vertical displacements of two points on the film, is the initial distance between two points on the film, is the temperature difference between room temperature and the specified temperature; When taking the points, the two points on the film are located on the same vertical line.

[0046] The present invention is a film wrinkle generating device that can simultaneously apply force and heat loads, with a simple overall structure and convenient processing, installation and use. The device realizes the application of tensile tension loads when there are no wrinkles on the film surface, and the coupled application of shear loads and heat loads when wrinkles are generated, thereby realizing wrinkle control of the film structure. In addition, another feature of the device is that when the position of the slider under the vertical film group is not locked, when the film expands or contracts due to temperature changes, the device can reflect the thermal elongation of the film, thereby realizing the experimental measurement of the thermal expansion coefficient of the film structure.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A film wrinkle generating device in a thermal environment, characterized in that: It comprises a support frame (1), a displacement loading module (2) and a non-contact heating module (3); The displacement loading module (2) is installed on one side of the support frame (1), and the non-contact heating module (3) is movably installed on the other side of the support frame; The support frame (1) comprises a base and two vertical rods (4) arranged in parallel, wherein the vertical rods (4) are fixed on the base; The displacement loading module (2) comprises a vertical guide rail (10), a transverse guide rail (12), a first horizontal support rod (16) and a second horizontal support rod (17); two vertical guide rails (10) are provided, which are respectively mounted on two vertical rods (4); a vertical sliding block (11) is provided on each vertical guide rail (10), and the vertical sliding block (11) is divided into an upper sliding block and a lower sliding block; The two ends of the first horizontal support rod (16) are respectively connected to the two upper sliding blocks, and the two ends of the second horizontal support rod (17) are respectively connected to the two lower sliding blocks; The upper slider and the lower slider are both provided with a slider clamp (18); The transverse guide rail (12) is fixed on the first horizontal support rod (16), and a transverse sliding block (13) is provided on the transverse guide rail (12); The first horizontal support rod (16) and the second horizontal support rod (17) are respectively connected with film connecting pieces (19), and the two film connecting pieces (19) are used to clamp the film test piece (20); A transverse positioning block (15) is provided on the transverse guide rail (12) and is used to limit the horizontal position of the transverse slider (13) and control the transverse displacement of the film.

2. The device for generating film wrinkles in a thermal environment according to claim 1, characterized in that: A vertical positioning block (7) is provided at the bottom of the front side of the vertical rod (4), and the vertical positioning block (7) is fixed to the vertical rod (4) by means of bolts.

3. The device for generating film wrinkles in a thermal environment according to claim 1, characterized in that: A vertical slider protection plate (8) is provided on the top of the front face of the vertical rod (4), and the vertical slider protection plate (8) is fixed to the vertical rod (4) by means of bolts.

4. The device for generating film wrinkles in a thermal environment according to claim 1, characterized in that: The non-contact heating module (3) comprises a support beam (21), a support rod (22) and a heating assembly (24); the heating assembly (24) is fixed on two support beams (21) arranged in parallel; two sections of each support beam (21) are connected to the support rod (22); and the support rod (22) is bolted to the vertical rod (4).

5. The device for generating film wrinkles in a thermal environment according to claim 4, characterized in that: The heating assembly (24) is composed of a plurality of quartz lamp heating modules, each of which is controlled by a temperature controller and is individually regulated according to the real-time temperature of the film fed back by the thermocouple module.

6. The device for generating film wrinkles in a thermal environment according to claim 1, characterized in that: The base includes two Y-direction transverse rods (5) and one X-direction transverse rod (6); The X-direction transverse rod (6) is located in the horizontal direction and connects two Y-direction transverse rods (5) arranged in parallel, and the two vertical rods (4) are respectively vertically connected to the two Y-direction transverse rods (5).

7. The device for generating film wrinkles in a thermal environment according to claim 1, characterized in that: The first horizontal support rod (16) comprises a connecting rod (161) in the middle and connecting blocks (162) on both sides, the connecting blocks (162) on both sides are fixed on the vertical sliding block (11), and the transverse guide rail (12) is installed on the connecting rod (161).

8. The device for generating film wrinkles in a thermal environment according to claim 7, characterized in that: The transverse positioning block (15) is bolted to the transverse guide rail (12); A set screw (14) is connected through the upper end of the transverse positioning block (15), and the set screw (14) is used to drive the transverse positioning block (15) to move horizontally, thereby limiting the horizontal position of the transverse sliding block (13).

9. A method for generating film wrinkles based on the film wrinkle generating device in a thermal environment according to any one of claims 1 to 8, characterized in that: The process includes: The two film connecting sheets (19) are removed, and the film test piece (20) is clamped between the two film connecting sheets (19); Fixing one of the film connecting pieces (19) to the transverse slider (13), and then locking the upper slider position of the vertical slider (11) by means of a slider clamp (18), thereby locking the position of the upper boundary of the film test piece (20); Another film connecting piece (19) is fixed to the second horizontal support rod (17), the position of the lower slider is not locked temporarily, and the lower edge of the film is in a natural sagging state according to gravity; Under the premise of ensuring that the surface of the thin film test piece (20) is as flat as possible, the lower boundary of the thin film is locked by fixing the position of the lower slider by means of a slider clamp (18); Adjusting the position of the transverse positioning block (15) to move the two transverse sliders (13), thereby driving the upper film connecting piece (19) to produce a displacement change along the X direction, thereby causing a transverse shear displacement on the upper boundary of the film and generating wrinkles; The heating component (24) is turned on, and when the film reaches a specified temperature, changes in the wrinkles of the film test piece (20) are observed.

10. A method for measuring the thermal expansion coefficient of a film based on the film wrinkle generation device under a thermal environment according to any one of claims 1 to 8, characterized in that: The process includes: The two film connecting sheets (19) are removed, and the film test piece (20) is clamped between the two film connecting sheets (19); Fixing one of the film connecting pieces (19) to the transverse slider (13), and then locking the upper slider position of the vertical slider (11) by means of a slider clamp (18), thereby locking the position of the upper boundary of the film test piece (20); Fixing another film connecting piece (19) to the second horizontal support rod (17), temporarily unlocking the position of the lower slider, and keeping the lower edge of the film in a naturally drooping state; Starting to heat the thin film test piece (20), and when the thin film test piece (20) stabilizes to a specified temperature, stopping the heating, and calculating a displacement cloud diagram of the thin film in a vertical direction after thermal expansion; The thermal expansion coefficient of the film is calculated by the formula: in, and are the vertical displacements of two points on the film, is the initial distance between two points on the film, is the temperature difference between room temperature and the specified temperature; When taking the points, the two points on the film are located on the same vertical line.

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