Aluminum-plastic composite film tensile testing device and method

Abstract

The application discloses an aluminum-plastic composite film tensile testing device and method, and belongs to the technical field of film strength testing tensile mechanisms, and comprises a workbench. According to the scheme, the clamping plate is arranged, the magnetic block drives the clamping plate to clamp the film through the mounting plate and the vertical rod after the electric puller is electrified, the second fixed roller is slowly pulled by the electric puller to move away from the first fixed roller, the film can be stretched in the movement process of the second fixed roller, and multiple groups of tests can be simultaneously performed, so that different batches of films can be simultaneously tested, the use personnel can compare the stretching effects of different batches of films, the two ends of the film are wound on the first fixed roller and the second fixed roller respectively, that is, the film is subjected to uniform tangential tension of the first fixed roller and the second fixed roller in the process of being stretched, the stress concentration of the film clamping point is effectively avoided, the test efficiency is affected, and the test efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of tensile testing mechanisms for thin films, and more specifically, to a tensile testing device and method for aluminum-plastic composite films. Background Technology

[0002] Tensile testing of aluminum-plastic composite films is a key means of evaluating their mechanical properties (such as tensile strength, elongation at break, and modulus of elasticity), and is crucial for product quality control, process optimization, and application reliability.

[0003] Early mechanical property testing of composite films was based on manual methods. Testers used simple tools, such as scissors and tensile testers, to perform tensile and shear tests. Although simple and crude, these methods could still provide some basic test data. As the performance requirements of composite films increased, traditional testing equipment began to be used for mechanical property testing. Existing devices for mechanical property testing of composite films include tensile testing machines, which clamp the composite film and stretch it before obtaining the results. Such machines can only test one composite film at a time and cannot test multiple composite films simultaneously, which severely affects testing efficiency if multiple composite films need to be tested.

[0004] To address the aforementioned issues, some solutions have been proposed in the prior art. For example, Chinese invention application CN117629729A discloses a mechanical property testing device for composite films. This device, by setting up multiple testing devices, facilitates tensile testing of multiple composite films, greatly reducing testing time and improving the accuracy of test data. However, most existing technologies fix the film by horizontal clamping, but horizontal clamping may result in uneven force distribution. If the force point is too small, the film may easily break at the force point, requiring time to replace the film and retest, which seriously affects testing efficiency. Summary of the Invention

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide a tensile testing device and method for aluminum-plastic composite films, which can improve testing efficiency.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A tensile testing device for aluminum-plastic composite films includes a worktable on which a fixing component for fixing the film is fixedly installed.

[0008] The fixing assembly includes a mounting bracket fixedly installed on the top wall of the workbench. A horizontal bar is fixedly installed on the mounting bracket. A first fixing roller is evenly fixedly installed on the horizontal bar. A support rod is fixedly installed on the top wall of the workbench. A slide rail is fixedly installed on the top wall of the support rod. A slider is horizontally slidably installed in the slide rail. A second fixing roller is fixedly installed on the slider. A mounting frame is fixedly installed on the second fixing roller. Vertical cylinders are fixedly installed on the top walls of both the workbench and the mounting frame. A mounting plate is vertically slidably installed in the vertical cylinder. A vertical rod is fixedly installed on the top wall of the mounting plate. A clamping plate is fixedly installed at the top end of the vertical rod. A drive assembly that cooperates with the mounting plate is provided on the workbench.

[0009] Furthermore, the drive assembly includes a vertical plate fixedly mounted on the top wall of the workbench, an electric tensioner fixedly mounted above the side wall of the vertical plate, a connecting frame fixedly mounted on the second fixed roller, and the output end of the electric tensioner fixedly connected to the connecting frame. A first spring is installed between the slider and the slide rail. An electromagnet electrically connected to the electric tensioner is embedded in the vertical cylinder. A magnetic block cooperating with the electromagnet is embedded in the mounting plate, and a second spring is fixedly mounted on the top wall of the mounting plate.

[0010] Furthermore, both the first fixed roller and the second fixed roller have limit grooves, and a pressure block is horizontally slidably installed in the limit groove. A limit spring is also installed between the pressure block and the first fixed roller.

[0011] Furthermore, the clamping plate has a slot, and the slot has a uniformly spaced connecting groove. A first air pipe is inserted into the mounting plate, and a linkage component is provided on the vertical rod. The first air pipe is connected to the slot through the linkage component.

[0012] Furthermore, the linkage assembly includes a slide groove on a vertical rod, a linkage rod extending into a hollow slot is slidably installed in the slide groove, a third spring is installed between the bottom wall of the linkage rod and the slide groove, a connecting hole is provided on the vertical rod, and the first air pipe is connected to the hollow slot through the connecting hole, and an exhaust valve with its output end connected to the hollow slot is inserted into the first air pipe.

[0013] Furthermore, a horizontal plate is provided on the top wall of the workbench, and limit plates are evenly installed on the top wall of the horizontal plate.

[0014] Furthermore, a pneumatic telescopic rod is fixedly installed on the workbench, and a second air pipe connected to the vertical cylinder is inserted into the input end of the pneumatic telescopic rod.

[0015] The present invention also provides a test method applicable to the above-mentioned aluminum-plastic composite film tensile testing device, comprising the following steps:

[0016] S1. When in use, wrap both ends of the film around the first fixed roller and the second fixed roller respectively. When the electric tensioner is started, the electromagnet is energized and generates a magnetic field. Under the action of the electromagnetic field, the magnetic block drives the clamping plate to clamp the film through the mounting plate and the vertical rod.

[0017] S2. Then, the electric tensioner slowly pulls the second fixed roller away from the first fixed roller. During the movement of the second fixed roller, the slider slides along the slide rail and stretches the first spring. During the movement of the second fixed roller, the film can be stretched and multiple tests can be performed at the same time. This allows for simultaneous testing of different batches of film, making it convenient for users to compare the stretching effect of different batches of film. Since the two ends of the film are wrapped around the first fixed roller and the second fixed roller respectively, the film is subjected to uniform tangential tension from the first fixed roller and the second fixed roller during the stretching process.

[0018] S3. During the upward movement of the mounting plate, the pressure in the space below the mounting plate in the vertical cylinder decreases. After the clamping plate clamps the film, the space below the mounting plate in the vertical cylinder draws air from the empty slot through the first air pipe and the linkage assembly, which reduces the pressure in the empty slot. Since the film is in contact with the connecting slot on the empty slot at this time, the clamping plate and the film are tightly attracted together under the action of pressure.

[0019] S4. When the user fixes the film onto the first fixed roller and the second fixed roller respectively, the limiting plate can limit the side wall of the film, thereby ensuring that the film on the first fixed roller and the second fixed roller is in a straight line. When the mounting plate moves upward, the airflow above the mounting plate in the vertical cylinder is compressed and flows into the pneumatic telescopic rod through the second air pipe. Then, the output end of the pneumatic telescopic rod retracts and drives the horizontal plate to move downward. During the downward movement of the horizontal plate, the limiting plate moves downward and gradually loses contact with the film.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] (1) This solution sets up a clamping plate. After the electric tensioner is powered on, the magnetic block drives the clamping plate to clamp the film through the mounting plate and vertical rod. The electric tensioner slowly pulls the second fixed roller to move away from the first fixed roller. During the movement of the second fixed roller, the film can be stretched and multiple tests can be performed at the same time. This allows for simultaneous testing of different batches of film, making it convenient for users to compare the stretching effect of different batches of film. Since the two ends of the film are wrapped around the first fixed roller and the second fixed roller respectively, the film is subjected to uniform tangential tension from the first fixed roller and the second fixed roller during the stretching process. This effectively avoids the film clamping point from being stressed and breaking, which affects the testing efficiency and improves the testing efficiency.

[0022] (2) By setting up an empty slot, the pressure in the space below the mounting plate in the vertical cylinder decreases during the upward movement of the mounting plate. When the clamping plate clamps the film, the space below the mounting plate in the vertical cylinder draws air from the empty slot through the first air pipe and the linkage component, which reduces the pressure in the empty slot. Since the film is in contact with the connecting groove on the empty slot at this time, the clamping plate and the film are tightly attracted together under the action of pressure, thereby avoiding the slippage between the film and the clamping plate that affects the test efficiency and further improving the test efficiency.

[0023] (3) By setting a limiting plate, when the user fixes the film on the first fixed roller and the second fixed roller respectively, the limiting plate can limit the side wall of the film, thereby ensuring that the film on the first fixed roller and the second fixed roller is on a straight line. This avoids the film from tilting during the fixing process, which would cause uneven stress on the film during the test and require time to be spent on retesting. Also, during the upward movement of the mounting plate, the airflow above the mounting plate in the vertical cylinder is compressed and flows into the pneumatic telescopic rod through the second air pipe. Then the output end of the pneumatic telescopic rod retracts and drives the limiting plate downward through the horizontal plate. During the downward movement of the limiting plate, it gradually disengages from the film, thereby avoiding the side wall of the limiting plate from affecting the test effect during the stretching process and requiring multiple tests, thus further improving the test efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 This is a cross-sectional view of the vertical cylinder and mounting plate of the present invention;

[0027] Figure 4 This is a cross-sectional view of the clamping plate and vertical rod of the present invention;

[0028] Figure 5 This is a combined diagram of the vertical cylinder, vertical rod, and clamping plate of the present invention;

[0029] Figure 6 This is a diagram showing the combination of the first fixed roller, the second fixed roller, and the pressure block of the present invention.

[0030] Figure 7 This is a combination diagram of the second fixed roller, pressure block, and limiting spring of the present invention;

[0031] Figure 8 This is a cross-sectional view of the pneumatic telescopic rod of the present invention.

[0032] Explanation of the labels in the diagram:

[0033] 1. Workbench;

[0034] 2. Fixing components; 201. Mounting bracket; 202. Horizontal bar; 203. First fixed roller; 204. Support rod; 205. Slide rail; 206. Slider; 207. Second fixed roller; 208. Mounting frame; 209. Vertical cylinder; 210. Mounting plate; 211. Vertical bar; 212. Clamping plate;

[0035] 3. Drive assembly; 301. Vertical plate; 302. Electric tensioner; 303. Connecting frame; 304. First spring; 305. Electromagnet; 306. Magnetic block; 307. Second spring;

[0036] 401. Pressure block; 402. Limit spring;

[0037] 501. Empty slot; 502. Connecting slot; 503. First air pipe; 504. Linkage assembly; 5041. Linkage rod; 5042. Third spring; 5044. Connecting hole; 5045. Exhaust valve;

[0038] 601. Horizontal plate; 602. Limiting plate; 603. Pneumatic telescopic rod; 604. Second air pipe. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] Please see Figures 1 to 8 A tensile testing device for aluminum-plastic composite film includes a worktable 1, on which a fixing component 2 for fixing the film is fixedly installed;

[0041] The fixing component 2 includes a mounting bracket 201 fixedly installed on the top wall of the workbench 1. A horizontal rod 202 is fixedly installed on the mounting bracket 201. A first fixing roller 203 is evenly fixedly installed on the horizontal rod 202. A support rod 204 is fixedly installed on the top wall of the workbench 1. A slide rail 205 is fixedly installed on the top wall of the support rod 204. A slider 206 is horizontally slidably installed in the slide rail 205. A second fixing roller 207 is fixedly installed on the slider 206. A mounting frame 208 is fixedly installed on the second fixing roller 207. A vertical cylinder 209 is fixedly installed on the top wall of both the workbench 1 and the mounting frame 208. A mounting plate 210 is vertically slidably installed in the vertical cylinder 209. A vertical rod 211 is fixedly installed on the top wall of the mounting plate 210. A clamping plate 212 is fixedly installed at the top end of the vertical rod 211. A driving component 3 that cooperates with the mounting plate 210 is provided on the workbench 1.

[0042] The drive assembly 3 includes a vertical plate 301 fixedly mounted on the top wall of the workbench 1. An electric tensioner 302 is fixedly mounted on the upper side wall of the vertical plate 301. A connecting frame 303 is fixedly mounted on the second fixed roller 207, and the output end of the electric tensioner 302 is fixedly connected to the connecting frame 303. A first spring 304 is installed between the slider 206 and the slide rail 205. An electromagnet 305 electrically connected to the electric tensioner 302 is embedded in the vertical cylinder 209. A magnetic block 306 cooperating with the electromagnet 305 is embedded in the mounting plate 210, and a second spring 307 is fixedly mounted on the top wall of the mounting plate 210.

[0043] Both the first fixed roller 203 and the second fixed roller 207 have limit grooves, and a pressure block 401 is horizontally slidably installed in the limit groove. A limit spring 402 is installed between the pressure block 401 and the first fixed roller 203.

[0044] In use, first, one end of the film is wrapped counterclockwise around the first fixed roller 203, and the other end of the film is placed clockwise on the second fixed roller 207. Then, the electric tensioner 302 is energized, at which point the electromagnet 305 is energized and generates a magnetic field. Under the action of the magnetic field, the magnetic block 306 drives the corresponding mounting plate 210 to move upward. At this time, the second spring 307 is compressed and has a tendency to return to its original position. During the upward movement of the mounting plate 210, the vertical rod 211 drives the clamping plate 212 to fix the film on the first fixed roller 203 and the second fixed roller 207 respectively. Then, the electric tensioner 302 slowly pulls the second fixed roller 207 towards the connecting frame 303. The film moves away from the first fixed roller 203, and during the movement of the second fixed roller 207, it drives the slider 206 to slide along the slide rail 205 and stretch the first spring 304. During the movement of the second fixed roller 207, the film can be stretched, thereby achieving the purpose of stretching the film and performing multiple tests at the same time. This allows for simultaneous testing of different batches of film, making it convenient for users to compare the stretching effects of different batches of film. Since the two ends of the film are respectively wrapped around the first fixed roller 203 and the second fixed roller 207, the film is subjected to a uniform tangential tension from the first fixed roller 203 and the second fixed roller 207 during the stretching process.

[0045] During use, the user can move the tension block. At this time, the limit spring 402 is stretched and tends to return to its original position. Then, after the film is placed on the first fixed roller 203 and the second fixed roller 207 respectively, the limit spring 402 contracts and drives the pressure block 401 to initially clamp the film, thereby preventing the film from slipping and affecting the testing efficiency, and further improving the testing efficiency.

[0046] like Figure 3 , Figure 4 As shown, the clamping plate 212 has a slot 501, and the slot 501 has a connecting slot 502 evenly distributed. The mounting plate 210 has a first air pipe 503 inserted into it, and the vertical rod 211 has a linkage component 504. The first air pipe 503 is connected to the slot 501 through the linkage component 504.

[0047] The linkage assembly 504 includes a groove formed on the vertical rod 211. A linkage rod 5041 extending into the empty slot 501 is slidably installed in the groove. A third spring 5042 is installed between the bottom wall of the linkage rod 5041 and the groove. A connecting hole 5044 is formed on the vertical rod 211, and the first air pipe 503 is connected to the empty slot 501 through the connecting hole 5044. An exhaust valve 5045 with its output end connected to the empty slot 501 is inserted into the first air pipe 503.

[0048] By adopting the above technical solution, the pressure in the space below the mounting plate 210 in the vertical cylinder 209 decreases during the upward movement of the mounting plate 210. After the clamping plate 212 clamps the film, the space below the mounting plate 210 in the vertical cylinder 209 draws air from the empty groove 501 through the first air pipe 503 and the linkage component 504, which reduces the pressure in the empty groove 501. Since the film is in contact with the connecting groove 502 on the empty groove 501 at this time, the clamping plate 212 and the film are tightly attracted together under the action of pressure, thereby avoiding the slippage between the film and the clamping plate 212 that affects the testing efficiency and further improving the testing efficiency.

[0049] During the clamping process of the clamping plate 212 clamping the film, the connecting rod 5041 gradually comes into contact with the film, and a reaction force is applied to the connecting rod 5041. Under the action of the reaction force, the connecting rod 5041 slides along the slide groove and squeezes the third spring 5042. When the clamping plate 212 clamps the film, the connecting rod 5041 drives the connecting hole 5044 to connect with the first air pipe 503. At this time, the space in the vertical cylinder 209 located below the mounting plate 210 can normally draw air through the first air pipe 503, connecting hole 5044, empty groove 501, and connecting groove 502. That is, only after the clamping plate 212 clamps the film can the space in the vertical cylinder 209 located below the mounting plate 210 normally draw air through the first air pipe 503, connecting hole 5044, empty groove 501, and connecting groove 502, thereby ensuring that the clamping plate 212 and the film can be attracted together, thereby improving the film's fixing effect, effectively preventing the film from moving during the stretching process, and further improving the testing efficiency.

[0050] like Figure 1 , Figure 3 , Figure 8 As shown, a horizontal plate 601 is provided on the top wall of the workbench 1, and limit plates 602 are evenly installed on the top wall of the horizontal plate 601.

[0051] A pneumatic telescopic rod 603 is fixedly installed on the workbench 1, and a second air pipe 604 connected to the vertical cylinder 209 is inserted into the input end of the pneumatic telescopic rod 603.

[0052] By adopting the above technical solution, when the user fixes the film on the first fixed roller 203 and the second fixed roller 207 respectively, the limiting plate 602 can limit the side wall of the film, thereby ensuring that the film on the first fixed roller 203 and the second fixed roller 207 is on a straight line, thus avoiding the film from tilting during the fixing process, which would cause uneven force on the film during the test and require time to be spent on retesting, further improving the testing efficiency.

[0053] As the mounting plate 210 moves upward, the airflow above the mounting plate 210 in the vertical cylinder 209 is compressed and flows through the second air pipe 604 into the pneumatic telescopic rod 603. Then, the output end of the pneumatic telescopic rod 603 retracts and drives the horizontal plate 601 to move downward. During the downward movement of the horizontal plate 601, the limiting plate 602 is also driven to move downward. As the limiting plate 602 moves downward, it gradually loses contact with the film, thereby avoiding the side wall of the limiting plate 602 from affecting the test results during the stretching process and requiring multiple tests, thus further improving the test efficiency.

[0054] After the test, as the electric tensioner 302 is de-energized, the electromagnet 305 is also de-energized. Then, the second spring 307 contracts and drives the clamping plate 212 to reset via the mounting plate 210 and the vertical rod 211. During the reset of the clamping plate 212, the third spring 5042 drives the connecting rod 5041 to reset upward. Then, during the downward reset of the mounting plate 210, the space above the mounting plate 210 in the vertical cylinder 209 draws air from the pneumatic telescopic rod 603 through the second air pipe 604, causing the pneumatic telescopic rod 603 to drive the limiting plate 602 to reset upward via the horizontal plate 601. At the same time, the first spring 304 drives the second fixed roller 207 to reset via the slider 206, which serves to prepare for the next operation.

[0055] The present invention also provides a test method applicable to the above-mentioned aluminum-plastic composite film tensile testing device, comprising the following steps:

[0056] S1. When in use, the two ends of the film are wound around the first fixed roller 203 and the second fixed roller 207 respectively. When the electric tensioner 302 is started, the electromagnet 305 is energized and generates a magnetic field. Then, under the action of the electromagnetic field, the magnetic block 306 drives the clamping plate 212 to clamp the film through the mounting plate 210 and the vertical rod 211.

[0057] S2. Then, the electric tensioner 302 slowly pulls the second fixed roller 207 away from the first fixed roller 203. During the movement of the second fixed roller 207, the slider 206 slides along the slide rail 205 and stretches the first spring 304. During the movement of the second fixed roller 207, the film can be stretched and multiple tests can be performed at the same time. This allows for simultaneous testing of different batches of film, making it convenient for users to compare the stretching effect of different batches of film. Since the two ends of the film are respectively wrapped around the first fixed roller 203 and the second fixed roller 207, the film is subjected to a uniform tangential tension from the first fixed roller 203 and the second fixed roller 207 during the stretching process.

[0058] S3. During the upward movement of the mounting plate 210, the pressure in the space below the mounting plate 210 in the vertical cylinder 209 decreases. After the clamping plate 212 clamps the film, the space below the mounting plate 210 in the vertical cylinder 209 draws air from the empty groove 501 through the first air pipe 503 and the linkage component 504, which reduces the pressure in the empty groove 501. Since the film is attached to the connecting groove 502 on the empty groove 501 at this time, the clamping plate 212 and the film are tightly attracted together under the action of pressure.

[0059] S4. When the user fixes the film onto the first fixed roller 203 and the second fixed roller 207 respectively, the limiting plate 602 can limit the side wall of the film, thereby ensuring that the film on the first fixed roller 203 and the second fixed roller 207 is in a straight line. When the mounting plate 210 moves upward, the airflow in the vertical cylinder 209 above the mounting plate 210 is compressed and flows into the pneumatic telescopic rod 603 through the second air pipe 604. Then, the output end of the pneumatic telescopic rod 603 retracts and drives the horizontal plate 601 to move downward. During the downward movement of the horizontal plate 601, the limiting plate 602 moves downward. Then, during the downward movement of the limiting plate 602, it gradually loses contact with the film.

[0060] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A tensile testing device for aluminum-plastic composite films, comprising a worktable (1), characterized in that: A fixing component (2) for fixing the film is fixedly installed on the worktable (1); The fixing assembly (2) includes a mounting bracket (201) fixedly installed on the top wall of the workbench (1). A horizontal rod (202) is fixedly installed on the mounting bracket (201). A first fixing roller (203) is evenly fixedly installed on the horizontal rod (202). A support rod (204) is fixedly installed on the top wall of the workbench (1). A slide rail (205) is fixedly installed on the top wall of the support rod (204). A slider (206) is horizontally slidably installed inside the slide rail (205), and a second fixing roller (203) is fixedly installed on the slider (206). A fixed roller (207) is fixedly mounted on the second fixed roller (207), and a mounting frame (208) is fixedly mounted on the top wall of the worktable (1) and the mounting frame (208). A vertical cylinder (209) is fixedly mounted on the top wall of the worktable (1) and the mounting frame (208). A mounting plate (210) is vertically slidably mounted inside the vertical cylinder (209). A vertical rod (211) is fixedly mounted on the top wall of the mounting plate (210). A clamping plate (212) is fixedly mounted on the top end of the vertical rod (211). A drive assembly (3) that cooperates with the mounting plate (210) is provided on the worktable (1). The drive assembly (3) includes a vertical plate (301) fixedly mounted on the top wall of the workbench (1), an electric tensioner (302) fixedly mounted on the upper side wall of the vertical plate (301), a connecting frame (303) fixedly mounted on the second fixed roller (207), and the output end of the electric tensioner (302) fixedly connected to the connecting frame (303). A first spring (304) is installed between the slider (206) and the slide rail (205). An electromagnet (305) electrically connected to the electric tensioner (302) is embedded in the vertical cylinder (209). A magnetic block (306) cooperating with the electromagnet (305) is embedded on the mounting plate (210), and a second spring (307) is fixedly mounted on the top wall of the mounting plate (210).

2. The aluminum-plastic composite film tensile testing device according to claim 1, characterized in that: Both the first fixed roller (203) and the second fixed roller (207) have limit grooves, and a pressure block (401) is horizontally slidably installed in the limit groove. A limit spring (402) is installed between the pressure block (401) and the first fixed roller (203).

3. The aluminum-plastic composite film tensile testing device according to claim 2, characterized in that: The clamping plate (212) has a slot (501) and a connecting slot (502) is evenly provided on the slot (501). A first air pipe (503) is inserted into the mounting plate (210), and a linkage component (504) is provided on the vertical rod (211). The first air pipe (503) is connected to the slot (501) through the linkage component (504).

4. The aluminum-plastic composite film tensile testing device according to claim 3, characterized in that: The linkage assembly (504) includes a groove on a vertical rod (211), a linkage rod (5041) extending into a slot (501) is slidably installed in the groove, a third spring (5042) is installed between the bottom wall of the linkage rod (5041) and the groove, a connecting hole (5044) is provided on the vertical rod (211), and the first air pipe (503) is connected to the slot (501) through the connecting hole (5044), and an exhaust valve (5045) with its output end connected to the slot (501) is inserted into the first air pipe (503).

5. The aluminum-plastic composite film tensile testing device according to claim 4, characterized in that: The workbench (1) has a horizontal plate (601) on its top wall, and limit plates (602) are evenly installed on the top wall of the horizontal plate (601).

6. The aluminum-plastic composite film tensile testing device according to claim 5, characterized in that: A pneumatic telescopic rod (603) is fixedly installed on the workbench (1), and a second air pipe (604) connected to the vertical cylinder (209) is inserted into the input end of the pneumatic telescopic rod (603).

7. A test method applicable to the aluminum-plastic composite film tensile testing device according to any one of claims 1-6, characterized in that, Includes the following steps: S1. When in use, the two ends of the film are wound around the first fixed roller (203) and the second fixed roller (207) respectively. When the electric tensioner (302) is started, the electromagnet (305) is energized and generates a magnetic field. Then, under the action of the electromagnetic field, the magnetic block (306) drives the clamping plate (212) to clamp the film through the mounting plate (210) and the vertical rod (211). S2. Then the electric tensioner (302) slowly pulls the second fixed roller (207) away from the first fixed roller (203). During the movement of the second fixed roller (207), the slider (206) slides along the slide rail (205) and stretches the first spring (304). During the movement of the second fixed roller (207), the film is stretched. At the same time, multiple tests are performed to test different batches of film simultaneously, so that users can compare the stretching effect of different batches of film. Since the two ends of the film are wrapped around the first fixed roller (203) and the second fixed roller (207) respectively, the film is subjected to uniform tangential tension from the first fixed roller (203) and the second fixed roller (207) during the stretching process. S3. During the upward movement of the mounting plate (210), the pressure in the space below the mounting plate (210) in the vertical cylinder (209) decreases. After the clamping plate (212) clamps the film, the space below the mounting plate (210) in the vertical cylinder (209) draws air from the empty groove (501) through the first air pipe (503) and the linkage component (504), which reduces the pressure in the empty groove (501). Since the film is attached to the connecting groove (502) on the empty groove (501) at this time, the clamping plate (212) and the film are tightly attracted together under the action of pressure. S4. When the user fixes the film on the first fixed roller (203) and the second fixed roller (207) respectively, the limiting plate (602) limits the side wall of the film, thereby ensuring that the film on the first fixed roller (203) and the second fixed roller (207) is in a straight line. When the mounting plate (210) moves upward, the airflow above the mounting plate (210) in the vertical cylinder (209) is squeezed and flows into the pneumatic telescopic rod (603) through the second air pipe (604). Then the output end of the pneumatic telescopic rod (603) retracts and drives the horizontal plate (601) to move downward. During the downward movement of the horizontal plate (601), the limiting plate (602) moves downward. Then, during the downward movement of the limiting plate (602), it gradually disengages from the film.

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