Film biaxial stretching device

Abstract

The present invention relates to the field of film stretching technology, and provides a film biaxial stretching device, comprising a frame, two fixed clamps, two movable clamps, two displacement assemblies, and two tension detection assemblies; the frame is provided with a hollow area, two fixed clamps are arranged on two adjacent sides of the hollow area, and two movable clamps are arranged on two adjacent sides of the hollow area; the movable clamps are connected to the frame via their corresponding tension detection assemblies and displacement assemblies, and the two ends of the tension detection assemblies are respectively connected to the corresponding movable clamps and displacement assemblies. The film biaxial stretching device provided by the present invention utilizes two displacement assemblies to adjust the force applied to the film in different directions, and detects the force condition via the tension detection assembly, so that after adjusting to the target load value, the film biaxial stretching device can keep the internal force of the film in a constant state, so as to facilitate testing parameter changes of the film in a long-term prestressed state and vibration modal testing and other experimental requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of film stretching, in particular to a film biaxial stretching device. Background Art

[0002] With the rapid development of aerostat application research, modern composite membrane materials have gained widespread application due to their high strength, lightweight, and chemical stability. Furthermore, composite membrane materials are widely used in fields such as biotechnology, chemical engineering, emerging architecture, and oil exploration. Membrane structures generally exhibit large deformations and low-frequency vibrations, which has garnered widespread attention regarding their dynamics, leading to extensive research on their natural vibration characteristics. Membrane structure applications are relatively large, and analyzing the in-situ stress and vibration characteristics of these systems is not only time-consuming and labor-intensive, requiring high-quality sites, but also extremely costly. The results are also highly susceptible to environmental variables such as temperature, wind speed, and sunlight. Therefore, most studies focus on simulating the in-situ mechanical conditions of the localized membrane structure.

[0003] Existing film stretching devices are mainly designed for film structures in the packaging, semiconductor and other industries. The destructive strength of these films is very different from the destructive strength of the high-strength composite film used in airships. In addition, the design function of the existing film stretching device is mainly to ensure that the film has good thickness uniformity during the production process. The application scenario is mainly assembly line operation, and it is not very applicable to quality inspection and laboratory testing of high-strength composite films.

[0004] In view of this, in order to overcome the above technical problems, the present invention proposes a film stretching device suitable for the destructive strength verification and prestressed condition vibration modal verification of high-strength fabric films with bidirectional mixed loading, so as to solve the above problems. Summary of the Invention

[0005] The invention provides a film biaxial stretching device, which is used to solve the problems of existing film stretching devices, such as low applied load, inapplicability of high-strength fabric films, and inconvenience in laboratory application.

[0006] An embodiment of the present invention provides a biaxial film stretching device, comprising:

[0007] Frame, two fixed fixtures, two movable fixtures, two displacement components and two tension detection components;

[0008] The frame is provided with a hollow area, the two fixing clamps are arranged on two adjacent sides of the hollow area and connected to the frame, and the two movable clamps are arranged on two adjacent sides of the hollow area and opposite to the fixing clamps;

[0009] The movable clamp is connected to the frame through the corresponding tension detection component and the displacement component. The two fixed clamps and the two movable clamps are respectively used to clamp the four sides of the film. The two ends of the tension detection component are respectively connected to the corresponding movable clamp and the displacement component to adjust the pressure on the film in different directions through the displacement component.

[0010] According to a biaxial film stretching device provided by the present invention, the two fixed clamps are respectively a first fixed clamp and a second fixed clamp, and the two movable clamps are respectively a first movable clamp and a second movable clamp;

[0011] The first fixed clamp is arranged at the top of the hollow area, the second fixed clamp is arranged at the right side of the hollow area, the first movable clamp is arranged at the bottom of the hollow area, and the second movable clamp is arranged at the left side of the hollow area.

[0012] According to a biaxial film stretching device provided by the present invention, the two displacement assemblies are respectively a first displacement assembly and a second displacement assembly, and the two tension detection assemblies are respectively a first tension detection assembly and a second tension detection assembly;

[0013] Two ends of the first tension detection component are connected to the first movable clamp and the first displacement component respectively, and two ends of the second tension detection component are connected to the second movable clamp and the second displacement component respectively.

[0014] According to a film biaxial stretching device provided by the present invention, the first tension detection assembly and the second tension detection assembly both include a plurality of tension sensors arranged in parallel.

[0015] According to a film biaxial stretching device provided by the present invention, the fixed fixture and the movable fixture both include: a bracket, a connecting piece and a supporting piece;

[0016] The bracket of the fixed clamp is connected to the frame, and the bracket of the movable clamp is connected to the displacement component through the tension detection component. The side of the bracket close to the film is provided with the connecting member and the supporting member in sequence, the connecting member is used to connect to one side of the film, and the supporting member is used to support the film.

[0017] According to a film biaxial stretching device provided by the present invention, the displacement assembly includes: a first knob, a transmission screw and a connecting rod;

[0018] The transmission screw is rotatably disposed in the frame, one end of the transmission screw is connected to the first knob, and the other end of the transmission screw is rotatably connected to the connecting rod, and the tension detection component is connected to the connecting rod;

[0019] During the rotation of the transmission screw, the connecting rod moves in a direction approaching or away from the film.

[0020] According to a film biaxial stretching device provided by the present invention, the displacement assembly further comprises: a second knob and a reduction box;

[0021] The transmission screw and the gear set are provided in the reduction box, and the second knob is transmission-connected to the transmission screw through the gear set.

[0022] According to a biaxial stretching device for a film provided by the present invention, the displacement assembly also includes: a limit member, a limit hole is provided in the connecting rod, the limit hole extends in a direction close to or away from the film, one end of the limit member is connected to the reduction box or frame, and the other end of the limit member is slidably disposed in the limit hole.

[0023] According to a biaxial film stretching device provided by the present invention, the frame includes: a reinforcement and a plurality of metal blocks connected end to end in sequence, the hollow area is provided at the center of the frame formed by connecting the plurality of metal blocks, and the reinforcement is connected between adjacent metal blocks.

[0024] According to a biaxial film stretching device provided by the present invention, the biaxial film stretching device further includes: a mounting base, the mounting base is provided with a mounting position with an adjustable clamping space, and the frame is detachably arranged at the mounting position.

[0025] The film biaxial stretching device provided by the present invention is provided with a frame, two fixed clamps, two movable clamps, two displacement components and two tension detection components. The frame is provided with a hollow area. The two fixed clamps are arranged on two adjacent sides of the hollow area and are connected to the frame. The two movable clamps are arranged on two adjacent sides of the hollow area and are arranged opposite to the fixed clamps. The movable clamps are connected to the frame through their corresponding tension detection components and displacement components. The two fixed clamps and the two movable clamps are respectively used to clamp the four sides of the film. The two ends of the tension detection component are respectively connected to the corresponding movable clamps and displacement components to adjust the pressure on the film in different directions through the displacement components. During use, the two displacement components are used to adjust the force on the film in different directions, and the tension detection component is used to detect the force condition, so that after adjusting to the target load value, the film biaxial stretching device can keep the internal force of the film in a constant state, so as to facilitate the test requirements such as parameter changes and vibration modal testing of the film in a long-term prestressed state. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is one of the schematic diagrams of the film biaxial stretching device provided by the present invention;

[0028] Figure 2 This is the second schematic diagram of the film biaxial stretching device provided by the present invention;

[0029] Figure 3 This is the third schematic diagram of the film biaxial stretching device provided by the present invention

[0030] Reference numerals:

[0031] 10. Frame; 101. Metal block; 102. Reinforcement; 20. Fixing fixture; 201. First fixing fixture; 202. Second fixing fixture; 30. Movable fixture; 301. First movable fixture; 302. Second movable fixture; 40. Displacement assembly; 401. First displacement assembly; 402. Second displacement assembly; 403. First knob; 404. Drive screw; 405. Connecting rod; 406. Second knob; 407. Reducer; 50. Tension detection assembly; 501. First tension detection assembly; 502. Second tension detection assembly; 60. Limiting member; 70. Mounting base; 701. Vise. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0033] In the description of the embodiments of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0035] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0036] The following combination Figures 1 to 3 The film biaxial stretching device provided by an embodiment of the present invention is described. The film biaxial stretching device includes: a frame 10 , two fixed clamps 20 , two movable clamps 30 , two displacement assemblies 40 and two tension detection assemblies 50 .

[0037] In this embodiment, the frame 10 serves as the main body of the entire film biaxial stretching device, and is used to accommodate two fixed clamps 20, two movable clamps 30, two displacement assemblies 40 and two tension detection assemblies 50. A hollow area is provided on the frame 10, and the two fixed clamps 20 are arranged on adjacent sides of the hollow area, and the two fixed clamps 20 are fixedly connected to the frame 10. The two movable clamps 30 are arranged on adjacent sides of the hollow area, and the two movable clamps 30 are arranged opposite to the fixed clamps 20. The movable clamps 30 are connected to the frame 10 through their corresponding tension detection assemblies 50 and displacement assemblies 40. The movable clamps 30 move with the loading of the load. The two ends of the tension detection assembly 50 are respectively connected to the corresponding movable clamps 30 and displacement assemblies 40 to adjust the pressure on the film in different directions through the displacement assembly 40.

[0038] The shape of the film can be square, cross, mesh, or lace-shaped. The two fixed clamps 20 and the two movable clamps 30 are respectively used to clamp the four sides of the film. For example, in this embodiment, the upper and lower relative fixed clamps 20 and movable clamps 30 are used to apply vertical loads to the film, while the left and right relative fixed clamps 20 and movable clamps 30 are used to apply lateral loads to the film.

[0039] When biaxial film stretching is required, the film is first secured by two fixed clamps 20 and two movable clamps 30. These clamps then apply a load to the film. The vertically opposed fixed clamps 20 and movable clamps 30 apply a vertical load, while the horizontally opposed fixed clamps 20 and movable clamps 30 apply a lateral load. The displacement assembly 40 adjusts the pressure applied to the film in different directions, and the tension detection assembly 50 monitors the pressure.

[0040] When the biaxial film stretching apparatus only requires uniaxial stretching, it only requires a fixed fixture 20, a movable fixture 30, and a tension detection assembly 50. The film is secured by the fixed fixture 20 and the movable fixture 30. The film is then loaded horizontally or vertically to the desired tension, with the horizontal and vertical loads independently of each other. The displacement assembly 40 adjusts the pressure applied to the film in different directions, and the tension detection assembly 50 monitors the pressure.

[0041] The tension detection component 50 obtains the tension in real time. After being adjusted to the target load value, in an environment without drastic temperature changes, the film biaxial stretching device can keep the internal force of the film in a constant state, so as to facilitate testing of parameter changes of the long-term prestressed film and vibration modal testing and other test requirements.

[0042] The film biaxial stretching device provided by the present invention utilizes two displacement components 40 to adjust the forces on the film in different directions, and detects the forces through a tension detection component 50, so that after adjusting to the target load value, the film biaxial stretching device can keep the internal force of the film in a constant state, so as to facilitate testing parameter changes of the film in a long-term prestressed state and vibration modal testing and other experimental requirements.

[0043] In one embodiment, Figures 1 to 3 As shown, the two fixed clamps 20 are respectively a first fixed clamp 201 and a second fixed clamp 202, and the two movable clamps 30 are respectively a first movable clamp 301 and a second movable clamp 302. The first fixed clamp 201 is arranged at the top of the hollow area, the second fixed clamp 202 is arranged at the right side of the hollow area, the first movable clamp 301 is arranged at the bottom of the hollow area, and the second movable clamp 302 is arranged at the left side of the hollow area.

[0044] In this embodiment, the first fixed clamp 201 is used to connect the top of the film, the second fixed clamp 202 is used to connect the right side of the film, the first movable clamp 301 is used to connect the bottom of the film, and the second movable clamp 302 is used to connect the left side of the film.

[0045] During operation, the film is first fixed by the first fixed clamp 201, the second fixed clamp 202, the first movable clamp 301 and the second movable clamp 302. A certain load is applied to the film using the first fixed clamp 201, the second fixed clamp 202, the first movable clamp 301 and the second movable clamp 302. The first fixed clamp 201 and the first movable clamp 301 corresponding to each other are used to apply a vertical load to the film, while the second fixed clamp 202 and the second movable clamp 302 opposite to each other are used to apply a lateral load to the film. The displacement component 40 can adjust the movement of the first movable clamp 301 and the second movable clamp 302 to adjust the pressure on the film in different directions, and the tension detection component 50 is used to detect the value. The tension detection component 50 obtains the tension in real time. When adjusted to the target load value, in an environment without rapid temperature changes, the biaxial stretching device for the film can keep the internal force of the film in a constant state, so as to facilitate the testing of parameter changes of the film in a long-term prestressed state and vibration modal testing and other test requirements.

[0046] To facilitate control of the first movable clamp 301 and the second movable clamp 302, the two displacement assemblies 40 are further configured as a first displacement assembly 401 and a second displacement assembly 402, and the two tension detection assemblies 50 are configured as a first tension detection assembly 501 and a second tension detection assembly 502. The first tension detection assembly 501 is connected at both ends to the first movable clamp 301 and the first displacement assembly 401, respectively. The second tension detection assembly 502 is connected at both ends to the second movable clamp 302 and the second displacement assembly 402, respectively. The first tension detection assembly 501 is used to detect the vertical load on the film, while the second tension detection assembly 502 is used to detect the horizontal load on the film.

[0047] Specifically, the first tension detection assembly 501 and the second tension detection assembly 502 each include a plurality of tension sensors arranged in parallel. In this embodiment, the first tension detection assembly 501 includes two tension sensors arranged in parallel in the vertical direction, and the second tension detection assembly 502 includes two tension sensors arranged in parallel in the horizontal direction.

[0048] During operation, the values ​​of two groups of four tension sensors in two directions are observed, and the readings of the two tension sensors in each direction are adjusted to the same value range, so that the stress in the film can be uniform and the measurement accuracy can be improved.

[0049] It should be noted that, according to actual use requirements, the entire film biaxial stretching device can be placed horizontally or vertically.

[0050] When the entire film biaxial stretching device is placed vertically, Figures 1 to 3As shown, the first fixed clamp 201 is used to connect to the top of the film, the second fixed clamp 202 is used to connect to the right side of the film, the first movable clamp 301 is used to connect to the bottom of the film, and the second movable clamp 302 is used to connect to the left side of the film. The first fixed clamp 201 and the first movable clamp 301, which correspond to each other in the vertical direction, are used to apply a vertical load to the film, while the second fixed clamp 202 and the second movable clamp 302, which correspond to each other in the left and right directions, are used to apply a lateral load to the film.

[0051] When the entire biaxial film stretching apparatus is positioned horizontally, the first fixed clamp 201 is connected to the top of the film, the second fixed clamp 202 is connected to the right side of the film, the first movable clamp 301 is connected to the bottom of the film, and the second movable clamp 302 is connected to the left side of the film. The first fixed clamp 201 and the first movable clamp 301, which correspond to each other vertically, apply a load to the film in a first horizontal direction, while the second fixed clamp 202 and the second movable clamp 302, which correspond to each other horizontally, apply a load to the film in a second horizontal direction. The first and second horizontal directions are perpendicular.

[0052] Based on the above embodiments, in one embodiment, Figures 1 to 3 As shown, the structures of the fixed clamp 20 and the movable clamp 30 are similar, and both the fixed clamp 20 and the movable clamp 30 include: a bracket, a connecting member and a supporting member; the bracket of the fixed clamp 20 is connected to the frame 10, and the bracket of the movable clamp 30 is connected to the displacement component 40 through the tension detection component 50, and the side of the bracket close to the film is provided with a connecting member and a supporting member in sequence, the connecting member is used to connect to one side of the film, and the supporting member is used to support the film.

[0053] Specifically, the perimeter of the film connecting to the fixed fixture 20 and the movable fixture 30 must be sleeve-shaped, while the connecting and supporting members are metal rods. The rod in the fixed fixture 20 or movable fixture 30, which is farther from the film, passes through the sleeve of the film, while the other rod provides support for the film. Connecting the film with the metal rods ensures stability during connection, while the support provided by the metal rods maintains the direction of force applied to the film.

[0054] Based on the above embodiments, in one embodiment, Figures 1 to 3 As shown, the displacement assembly 40 includes a first knob 403, a drive screw 404, and a connecting rod 405. The drive screw 404 is rotatably disposed within the frame 10. One end of the drive screw 404 is connected to the first knob 403, and the other end of the drive screw 404 is rotatably connected to the connecting rod 405. The connecting rod 405 is connected to the tension detection assembly 50, that is, two tension sensors are connected to the connecting rod 405. When the drive screw 404 is rotated by the first knob 403, the connecting rod 405 moves toward or away from the film.

[0055] The first displacement assembly 401 and the second displacement assembly 402 have the same structure, both including a first knob 403 , a transmission screw 404 and a connecting rod 405 .

[0056] When the load on the film in the vertical direction needs to be adjusted, the first knob 403 of the first displacement assembly 401 is used to control the transmission screw 404 to rotate, and the connecting rod 405 of the first displacement assembly 401 can move in a direction close to or away from the film.

[0057] When the load on the film in the horizontal direction needs to be adjusted, the first knob 403 of the second displacement assembly 402 is used to control the transmission screw 404 to rotate, and the connecting rod 405 of the second displacement assembly 402 can move in a direction close to or away from the film.

[0058] To achieve more precise load control, displacement assembly 40 also includes a second knob 406 and a reduction gearbox 407. The reduction gearbox 407 houses a drive screw 404 and a gear train, with the second knob 406 being connected to the drive screw 404 via the gear train. The reduction gearbox 407 effectively increases the load application stroke, enabling more precise load control and amplifying the load applied by the operator turning the second knob 406.

[0059] The first displacement assembly 401 and the second displacement assembly 402 have the same structure, both including a second knob 406 and a reduction box 407 .

[0060] To roughly adjust the vertical load on the film, the first knob 403 of the first displacement assembly 401 controls the rotation of the drive screw 404, allowing the connecting rod 405 of the first displacement assembly 401 to move vertically toward or away from the film. To finely adjust the vertical load on the film, the second knob 406 of the first displacement assembly 401 controls the rotation of the drive screw 404 via the gear train. The gear train effectively increases the load application stroke, allowing the connecting rod 405 of the first displacement assembly 401 to move vertically toward or away from the film.

[0061] To adjust the horizontal load on the film, the first knob 403 of the second displacement assembly 402 controls the rotation of the drive screw 404, allowing the connecting rod 405 of the second displacement assembly 402 to move horizontally toward or away from the film. To fine-tune the horizontal load on the film, the second knob 406 of the second displacement assembly 402 controls the rotation of the drive screw 404 via the gear train. The gear train effectively increases the travel of the applied load, allowing the connecting rod 405 of the second displacement assembly 402 to move horizontally toward or away from the film.

[0062] At the same time, the reduction box 407 has a self-locking function. After being adjusted to the target load value, in an environment without rapid temperature changes, the film biaxial stretching device can keep the internal force of the film at a constant state.

[0063] To prevent the torque applied by the drive screw 404 from causing the movable clamp 30 to rotate about the drive screw axis, thereby causing the film to twist and lose its flatness, thus affecting the final test results, the displacement assembly also includes a stopper 60. A stopper hole is provided in the connecting rod 405, extending in a direction toward or away from the film. One end of the stopper 60 is connected to the reduction gear box 407 or the frame 10, and the other end of the stopper 60 is slidably disposed in the stopper hole. Therefore, during the rotation of the drive screw 404, the drive screw 404 can only control the connecting rod 405 to move in a straight line, ensuring that the film is subjected to force.

[0064] Based on the above embodiments, in one embodiment, Figures 1 to 3 As shown, the frame 10 includes: a reinforcement 102 and a plurality of metal blocks 101 connected end to end in sequence. The frame 10 formed by connecting the plurality of metal blocks 101 has a hollow area at its center, and reinforcements 102 are connected between adjacent metal blocks 101.

[0065] Specifically, the frame 10 comprises a rectangular metal frame composed of four slender, high-strength metal blocks 101. The frame includes hollowed-out areas for accommodating two fixed fixtures 20, two movable fixtures 30, two displacement assemblies 40, and two tension detection assemblies 50. To ensure sufficient structural strength for conducting tensile failure tests on high-strength fabric films, four triangular reinforcements 102 are designed within the rectangular metal frame. The two sides of each reinforcement 102 are connected to two adjacent metal blocks 101.

[0066] To facilitate laboratory use, the biaxial film stretching apparatus also includes a mounting base 70, which has a mounting position with adjustable clamping space, and the frame 10 is removably mounted in the mounting position. Specifically, the mounting base 70 is a vise 701. To ensure effective fixation, two vises 701 are provided, which can vertically secure the frame 10.

[0067] In summary, the film biaxial stretching device provided in this application has the following beneficial effects:

[0068] (1) A manual mechanical loading method is adopted to reduce the complexity, volume and cost of the device. At the same time, the transmission is smooth and accurate by utilizing the cooperation of the reduction box 407 and the transmission screw 404. The transmission force can be adjusted in a wide and accurate range. After adjusting to the target load value, the reduction box 407 can self-lock, so that the film always maintains a constant stress state.

[0069] (2) To ensure that the applied load is evenly transferred to the film, the movable clamp 30 is connected to the connecting rod 405 through two tension sensors, which receive the displacement changes caused by the rotation of the transmission screw 404 and adjust the tension values ​​of the two tension sensors to the same tension value range to ensure that the force-bearing edge of the film is perpendicular to the force transmission direction, so that the film is evenly stressed.

[0070] (3) The film clamp design is easy to operate, has high structural strength and high compatibility, so that the stretching device can be compatible with various shapes of films such as quadrilateral, cross, mesh, lace, etc., while ensuring that the load applied by the device can reach the destructive strength of high-strength fabric films.

[0071] (4) Thanks to the manual mechanical control, the device is small in size and occupies a small space, making it convenient for operators to move and clamp it.

[0072] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A film biaxial stretching device, characterized in that: include: Frame, two fixed fixtures, two movable fixtures, two displacement components and two tension detection components; The frame is provided with a hollow area, the two fixing clamps are arranged on two adjacent sides of the hollow area and connected to the frame, and the two movable clamps are arranged on two adjacent sides of the hollow area and opposite to the fixing clamps; The movable clamp is connected to the frame via the corresponding tension detection assembly and the displacement assembly. The two fixed clamps and the two movable clamps are respectively used to clamp the four sides of the film. The two ends of the tension detection assembly are respectively connected to the corresponding movable clamp and the displacement assembly, so as to adjust the tension borne by the film in different directions through the displacement assembly. The two fixed clamps are respectively a first fixed clamp and a second fixed clamp, and the two movable clamps are respectively a first movable clamp and a second movable clamp; the first fixed clamp is arranged at the top of the hollow area, the second fixed clamp is arranged at the right side of the hollow area, the first movable clamp is arranged at the bottom of the hollow area, and the second movable clamp is arranged at the left side of the hollow area; The two displacement assemblies are respectively a first displacement assembly and a second displacement assembly, and the two tension detection assemblies are respectively a first tension detection assembly and a second tension detection assembly; two ends of the first tension detection assembly are respectively connected to the first movable clamp and the first displacement assembly, and two ends of the second tension detection assembly are respectively connected to the second movable clamp and the second displacement assembly; The first tension detection assembly and the second tension detection assembly each include a plurality of tension sensors arranged in parallel; The fixed fixture and the movable fixture each include: a bracket, a connecting piece, and a supporting piece; the bracket of the fixed fixture is connected to the frame, and the bracket of the movable fixture is connected to the displacement component via the tension detection component; the connecting piece and the supporting piece are sequentially provided on a side of the bracket close to the film, the connecting piece is used to connect to one side of the film, and the supporting piece is used to support the film; The displacement assembly includes: a first knob, a transmission screw, and a connecting rod; the transmission screw is rotatably disposed in the frame, one end of the transmission screw is connected to the first knob, and the other end of the transmission screw is rotatably connected to the connecting rod, and the tension detection assembly is connected to the connecting rod; during the rotation of the transmission screw, the connecting rod moves in a direction close to or away from the film; The displacement assembly further includes: a second knob and a reduction box; the transmission screw and the gear set are provided in the reduction box, and the second knob is transmission-connected to the transmission screw via the gear set.

2. The film biaxial stretching device according to claim 1, characterized in that: The displacement assembly also includes: a limit member, a limit hole is provided in the connecting rod, the limit hole extends in a direction close to or away from the film, one end of the limit member is connected to the reduction box or frame, and the other end of the limit member is slidably disposed in the limit hole.

3. The film biaxial stretching device according to claim 1 or 2, characterized in that: The frame includes: a reinforcement piece and a plurality of metal blocks connected end to end in sequence. The center of the frame formed by connecting the plurality of metal blocks is provided with the hollow area, and the reinforcement piece is connected between adjacent metal blocks.

4. The film biaxial stretching device according to claim 1 or 2, characterized in that: The film biaxial stretching device further comprises: a mounting base, wherein the mounting base is provided with a mounting position with an adjustable clamping space, and the frame is detachably arranged at the mounting position.

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