Tensile test device for graphene film manufacturing and method thereof

Abstract

The invention relates to the technical field of graphene film manufacturing, in particular to a tensile test device and method for graphene film manufacturing, and the tensile test device comprises a test board, a tensile mechanism, a die pressing part, an implementation part and a smoothing part. According to the invention, the two film pressing parts exchange positions up and down and the lower side film pressing plate continuously moves downwards to be separated from the implementation strip so as to realize the reassembly action, so that the stretching test action of the graphene film in the graphene film roll can be automatically and randomly carried out, the repeated clamping and disassembling steps are not needed, the convenience and efficiency in the stretching test process are improved, and the production cost is reduced. And secondly, the stretching stress is uniformly distributed on the graphene film through the mutual approaching action of the two corresponding flattening plates in the flattening part, so that an additional stress concentration point is prevented from being introduced by a wrinkled or bent part, the error is reduced, and the data accuracy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of graphene film manufacturing, and particularly to a tensile testing device and method for manufacturing graphene films. Background Art

[0002] A graphene film is a thin film material composed of a single layer or several layers of graphene. Due to its unique electrical, mechanical, thermal, and optical properties, graphene films have broad application prospects in the fields of electronic devices, sensors, energy storage and conversion, composite materials, etc.

[0003] In practical applications, graphene films may be subjected to varying degrees of tensile stress. Therefore, during the manufacturing process of graphene films, it is necessary to evaluate their mechanical properties by means of tensile testing of graphene films, especially for key indicators such as tensile strength and elastic modulus.

[0004] Currently, multiple graphene film strips are usually cut from a graphene film roll, and the strips are sequentially fixed to a tensile testing machine. Tensile force is gradually applied until the material breaks, and the magnitude of the applied tensile force and the corresponding deformation amount are recorded, thereby calculating the above-mentioned required mechanical property parameters. Thus, the tensile test of a single strip is completed. After that, the above process is repeated to conduct tensile tests on multiple strips, and finally multiple groups of strip data are obtained, and the true mechanical properties of the graphene film are reflected through the strip data.

[0005] The following problems exist in the current tensile testing process of graphene films: It is necessary for workers to first cut multiple strips from the graphene film roll and individually clamp them into the tensile testing machine for individual testing. After completing a single test, it is necessary to disassemble the tested strip. The overall steps are cumbersome, which is not conducive to the batch tensile testing of graphene films, and the overall operation efficiency is low. Secondly, during the tensile process, due to the generation of local stress after the graphene film strip is subjected to tensile stress, wrinkles are generated in some areas of the graphene film (see Figure 9 ), which affects the accuracy of the collected data. Summary of the Invention

[0006] Based on this, it is necessary to provide a tensile testing device for manufacturing graphene films, aiming to solve the problems of the above-mentioned prior art.

[0007] The present application provides a tensile testing device for manufacturing graphene films, which is used in cooperation with a monitoring device for monitoring and collecting images of the deformation status of graphene films and data analysis software for analyzing and processing the images. The device includes: a test bench, on which a mounting seat is fixedly arranged. The graphene film roll to be tested is installed above the mounting seat, and a tensile mechanism for conducting multiple tensile tests on the graphene film is arranged on the test bench.

[0008] The stretching mechanism includes a lifting frame. Lifting frames are slidably arranged up and down on the left and right end faces of the mounting base. Pressing film parts are arranged on the opposite faces of the two lifting frames. The pressing film part includes two compaction plates that are symmetrically arranged front and back. Rubber plates are fixedly arranged on the opposite faces corresponding to the two compaction plates. The two pressing film parts are staggered up and down. After the graphene film is compacted by the compaction plates, the lower pressing film part moves downward for stretching.

[0009] An implementation part for driving the corresponding two compaction plates to compact the graphene film is arranged on the test bench. The implementation part includes four implementation bars distributed in a rectangle. When the compaction plate moves to be opposite to the implementation bar front and back, the corresponding two implementation bars move closer to perform the compaction action of the compaction plate. When the lower pressing film part continues to move downward and the compaction plate disengages from the implementation bar, the pressing film part releases the pressing film action.

[0010] Two smoothing parts are arranged on the test bench and are both located between the two pressing film parts. The smoothing part includes two smoothing plates that are symmetrically arranged front and back. The graphene film is kept flat in the stretching area by the two smoothing plates moving closer to each other.

[0011] According to a preferred embodiment, a mounting frame is fixedly arranged on the test bench and is located in front of the mounting base. Moving plates are slidably arranged back and forth on the opposite faces of the mounting frame and the mounting base. Two rotating shafts are rotatably arranged on the moving plate and are distributed up and down. Avoidance frames are fixedly sleeved on the rotating shafts. Connecting plates are rotatably arranged on the avoidance frames. The two implementation bars that are opposite left and right are fixedly arranged on the two connecting plates that are opposite up and down.

[0012] According to a preferred embodiment, a return spring is fixedly arranged between the two mounting blocks on the same lifting frame. When the compaction plate moves downward and disengages from the implementation bar, the corresponding two compaction plates move away from each other through the return spring to release the graphene film.

[0013] According to a preferred embodiment, the pressing film part further includes contact rollers. Four contact rollers arranged in a matrix are rotatably arranged on the opposite faces of the two compaction plates that are opposite front and back. The axis of the contact roller extends from left to right.

[0014] According to a preferred embodiment, the avoidance frame is U-shaped. The horizontal length of the U-shaped area of the avoidance frame is greater than half of the horizontal length of the compaction plate. Deflection motors connected to the rotating shafts one by one are fixedly arranged on the moving plate. The orientation of the U-shaped opening on the avoidance frame is controlled by the deflection motor to avoid the moving process of the corresponding compaction plate.

[0015] According to a preferred embodiment, the implementation part further includes guiding bars. Guiding bars are fixedly arranged on the upper end faces of the implementation bars. The two guiding bars that are opposite front and back are symmetrically arranged front and back. The front guiding bar slopes downward from front to back.

[0016] According to an advantageous embodiment, a locking portion for locking the implementation strip and the compaction plate during the tensile test is provided on the lifting frame. The locking portion includes locking columns. Two locking columns that are distributed front and back and have vertical axes are fixedly provided on the end face of the longitudinal section of the lifting frame facing the implementation strip through a horizontal frame. The locking columns correspond to the adjacent implementation strips. A matching block is rotatably provided on the end face of the implementation strip facing the corresponding locking column. A locking groove is formed on the matching block. A scroll spring is fixedly provided between the matching block and the implementation strip.

[0017] According to an advantageous embodiment, the flattening portion further includes a sliding rod. A sliding rod whose axis extends from front to back is slidably penetrated through the front and back of the moving plate. The flattening plate is fixedly provided at one end of the sliding rod close to the implementation strip. A pressing spring sleeved on the sliding rod is fixedly provided between the flattening plate and the moving plate. A plurality of flattening rollers that are arranged at equal intervals from top to bottom and have axes extending from left to right are rotatably provided on the opposite faces of two adjacent flattening plates. Four plugging cylinders arranged in a matrix are fixedly provided on the front end face of the rear flattening plate. A plugging column that cooperates with the plugging cylinder is fixedly provided on the rear end face of the front flattening plate.

[0018] According to an advantageous embodiment, two horizontal rods that are distributed up and down and have axes extending from left to right are fixedly provided on the end face of the sliding plate away from the implementation strip through a rectangular block. Two V-shaped plates that are symmetric front and back are fixedly provided on the longitudinal section of the lifting frame. The V-shaped openings of the two V-shaped plates that face each other front and back are distributed oppositely.

[0019] In summary, the present invention includes at least one of the following beneficial effects: First, in the present invention, the film pressing portions exchange positions up and down, and the lower pressing template continuously moves down to disengage from the implementation strip to achieve the reloading action. Therefore, the tensile test action of the graphene film in the graphene film roll can be automatically and randomly performed, without repeating the clamping and disassembly steps multiple times, improving the convenience and efficiency during the tensile test, facilitating batch and multiple tensile tests. Secondly, through the mutual approach of the corresponding two flattening plates in the flattening portion, the tensile stress is evenly distributed on the graphene film, avoiding the introduction of additional stress concentration points due to wrinkled or bent parts, reducing errors, and improving the accuracy of the data.

[0020] Second, in the present invention, by inserting the plugging column into the plugging cylinder, the distance between the flattening rollers on the two flattening plates is controlled. While maintaining the flattening effect of the flattening rollers on the graphene film, the problem that the flattening rollers interfere with the tensile test process and affect the test results is avoided. At the same time, the stability of the flattening action during the tensile test is improved by forming an overall frame. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the provided drawings.

[0022] Figure 1 Fig. shows a three-dimensional structural schematic diagram of a tensile test device for manufacturing a graphene film according to an embodiment of the present invention.

[0023] Figure 2 Fig. shows a right view of a tensile test device for manufacturing a graphene film according to an embodiment of the present invention.

[0024] Figure 3 Fig. shows a right view between a compaction plate, an implementation bar, and a contact roller according to an embodiment of the present invention.

[0025] Figure 4 Fig. shows a right view between an implementation bar, a smoothing plate, and a smoothing roller according to an embodiment of the present invention.

[0026] Figure 5 Fig. shows a partially sectional three-dimensional schematic diagram between a moving plate, an implementation bar, and an avoidance frame according to an embodiment of the present invention.

[0027] Figure 6 Fig. shows a schematic diagram of the state change of the up-and-down movement switching of two film pressing parts according to an embodiment of the present invention.

[0028] Figure 7 Fig. shows according to an embodiment of the present invention Figure 6 An enlarged view of part A in.

[0029] Figure 8 Fig. shows according to an embodiment of the present invention Figure 6 An enlarged view of part B in.

[0030] Figure 9 Fig. shows a schematic diagram of the required effect after the smoothing part is smoothed according to an embodiment of the present invention.

[0031] Among them, the above-mentioned drawings include the following reference numerals: 1, test bench; 2, mounting seat; 3, stretching mechanism; 30, lifting frame; 300, lead screw; 301, mounting frame; 31, film pressing part; 310, compaction plate; 311, rubber plate; 312, moving plate; 313, rotating shaft; 314, avoidance frame; 315, connecting plate; 316, return spring; 317, contact roller; 318, deflection motor; 32, implementation part; 320, implementation bar; 321, guiding bar; 33, smoothing part; 330, smoothing plate; 331, sliding rod; 332, abutting spring; 333, smoothing roller; 334, insertion cylinder; 335, insertion column; 336, horizontal bar; 337, V-shaped plate; 34, locking part; 340, locking column; 341, matching block; 342, locking groove; 343, volute spring. Detailed implementation manners

[0032] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0033] As Figure 1 shown, a stretching and testing device for manufacturing graphene films is used in cooperation with a monitoring device for monitoring and collecting images of the deformation conditions of graphene films and data analysis software for analyzing and processing the images, and includes: a test bench 1, on which a mounting seat 2 is fixedly arranged. A scale is provided on the front end face of the mounting seat 2. The graphene film roll to be tested is installed above the mounting seat 2. A stretching mechanism 3 for performing multiple random stretching tests on the graphene film in the graphene film roll is arranged on the test bench 1.

[0034] As Figure 1 、 Figure 2 and Figure 3As shown, the stretching mechanism 3 includes a lifting frame 30. L-shaped lifting frames 30 are slidably arranged up and down on the left and right end faces of the mounting base 2. Pressing film parts 31 are arranged on the opposite faces of the two lifting frames 30. The pressing film part 31 includes two symmetrically arranged compaction plates 310 in the front and back. In order to improve the pressing force of the two compaction plates 310 in the same pressing film part 31 on the graphene film, rubber plates 311 are fixedly arranged on the opposite faces corresponding to the two compaction plates 310. By deforming the rubber plates 311 when pressing the graphene film, the friction force between the compaction plates 310 and the graphene film is increased, facilitating subsequent stretching tests. The compaction plates 310 are slidably arranged on the longitudinal sections of the corresponding lifting frames 30 through mounting blocks. The two pressing film parts 31 are staggered up and down. After the graphene film is compacted by the compaction plates 310, the lower pressing film part 31 moves down for stretching tests.

[0035] As Figure 1 , Figure 2 and Figure 3 shown, an implementation part 32 for driving the two compaction plates 310 in the same pressing film part 31 to compact the graphene film is arranged on the test bench 1. The implementation part 32 includes four implementation bars 320 distributed in a rectangular shape. When the compaction plates 310 in the pressing film part 31 move to be opposite to the implementation bars 320 in the front and back, the compaction action of the compaction plates 310 is implemented by the mutual approach of the implementation bars 320 opposite to each other in the front and back. When the lower pressing film part 31 continuously moves down and the compaction plates 310 are separated from the implementation bars 320, the pressing film part 31 releases the pressing action.

[0036] As Figure 1 , Figure 2 and Figure 4 shown, two smoothing parts 33 are arranged on the test bench 1 and are both located between the two pressing film parts 31. The smoothing part 33 includes two symmetrically arranged smoothing plates 330 in the front and back. The graphene film is kept flat in the stretching area by the mutual approach of the two smoothing plates 330.

[0037] During operation, first, the graphene film roll to be stretched and tested is manually installed on the mounting base 2, and the lower end of the graphene film passes through the two pressing film parts 31 from top to bottom in sequence. The two implementation bars 320 in the implementation part 32 approach each other. The implementation bars 320 contact the adjacent compaction plates 310 and press the compaction plates 310. Finally, the two compaction plates 310 in the same pressing film part 31 are pressed tightly in the front and back, so that the upper and lower ends of a selected section of the graphene film are both tightly clamped. Secondly, during the above pressing process, the two smoothing plates 330 in the same smoothing part 33 also approach each other, contact the graphene film but do not press the graphene film tightly, so as to ensure that the graphene film is in a flat state during subsequent stretching tests, and avoid the problem that stress concentration in some areas (instead of being evenly distributed on the whole sample) affects the authenticity of the test results.

[0038] Secondly, after pressing the graphene film as described above, the upper film pressing part 31 remains stationary. Taking the position where the upper film pressing part 31 is located as the reference position, the lower film pressing part 31 moves downward to pull the graphene film, so that the graphene film is stretched until this section of the graphene film is stretched and broken. Thus, the stretching test of this section of the graphene film is completed.

[0039] After completing the initial stretching test, the lower film pressing part 31 moves downward, and the compaction plate 310 inside it disengages from the contact with the implementation strip 320, so that the compaction plate 310 releases the pressing action on the graphene film, causing one end of the graphene film disconnected during the initial stretching to automatically fall off. At this time, the two compaction plates 310 inside the film pressing part 31 respectively move to the front and back sides of all the implementation strips 320. Then the film pressing part 31 moves upward, and the upper film pressing part 31 continues to move downward while maintaining the pressing state of the graphene film. Finally, the positions of the two film pressing parts 31 are swapped. During the process of swapping positions, the original upper film pressing part 31 pulls the graphene film downward, and after the original lower film pressing part 31 moves upward, the compaction plate 310 inside it re-comes into contact and cooperation with the implementation strip 320, re-pressing the corresponding graphene film, realizing the reinstallation action after the initial stretching detection of the graphene film. After that, the re-stretching detection operation can be carried out without manual repeated clamping many times.

[0040] As Figure 2 shown, sliding blocks are slidably arranged up and down on the left and right end faces of the mounting seat 2, and the lifting frame 30 is fixedly arranged on the corresponding sliding blocks. A lead screw 300 is rotatably arranged on the mounting seat 2 and penetrates through the corresponding sliding blocks. The lead screw 300 is in threaded cooperation with the sliding blocks, and the lead screw 300 is connected to an external servo motor (not shown in the figure).

[0041] During operation, the external servo motor works to drive the lead screw 300 to rotate forward and backward. With the threaded cooperation between the lead screw 300 and the sliding blocks, the sliding blocks can move up and down. The sliding blocks drive the corresponding film pressing parts 31 to move up and down through the lifting frame 30, facilitating the stretching test action and the reinstallation film pressing action. Secondly, precise tensile loading can be achieved through the external servo motor.

[0042] As Figure 1 、 Figure 2 and Figure 5 shown, an installation frame 301 is fixedly arranged on the test bench 1 in front of the mounting seat 2. Moving plates 312 are slidably arranged back and forth on the opposite faces of the installation frame 301 and the mounting seat 2. The moving plates 312 are driven to move back and forth by an external hydraulic cylinder. Two rotating shafts 313 are rotatably arranged on the moving plates 312 and are distributed up and down. Avoidance frames 314 are fixedly sleeved on the rotating shafts 313. Connecting plates 315 are rotatably arranged on the avoidance frames 314. Two left-right opposite implementation strips 320 are fixedly arranged on the two up-down opposite connecting plates 315.

[0043] As Figure 1 , Figure 2 and Figure 3 shown, a reset spring 316 is fixedly arranged between two mounting blocks on the same lifting frame 30. When the compaction plate 310 moves downward and disengages from the implementation strip 320, the corresponding two compaction plates 310 are separated from each other by the reset spring 316, releasing the graphene film.

[0044] As Figure 1 and Figure 3 shown, the film pressing part 31 further includes contact rollers 317. Four contact rollers 317 arranged in a matrix are rotatably arranged on the opposite back surfaces of the two front and rear compaction plates 310. The axis of the contact roller 317 extends from left to right. The rolling contact between the contact roller 317 and the implementation strip 320 replaces the direct sliding contact between the compaction plate 310 and the implementation strip 320, reducing frictional losses.

[0045] As Figure 1 and Figure 5 shown, the avoidance frame 314 is U-shaped. The horizontal length of the U-shaped area of the avoidance frame 314 is greater than half of the horizontal length of the compaction plate 310. A deflection motor 318 connected to the rotating shaft 313 one by one is fixedly arranged on the moving plate 312. The orientation of the U-shaped opening on the avoidance frame 314 is controlled by the deflection motor 318 to avoid the movement process of the corresponding compaction plate 310.

[0046] During operation, during the first tensile test operation, after the lower end of the graphene film passes through the two film pressing parts 31 from top to bottom in sequence, the external hydraulic cylinder works to make the two moving plates 312 approach each other. The moving plate 312 drives the implementation strip 320 thereon to move synchronously. Finally, the implementation strips 320 on both sides of the front side are both abutted against the corresponding compaction plates 310. At this time, the contact rollers 317 on the compaction plates 310 are in contact with the implementation strip 320. By replacing the sliding contact method with the rolling contact method, while the implementation strip 320 applies pressure to the compaction plate 310, it is convenient for the compaction plate 310 to move up and down, that is, while maintaining the pressing of the graphene film, tensile testing and the reinstallation action of the upper film pressing part 31 are carried out.

[0047] After the implementation strip 320 abuts against the compaction plate 310, the lifting frame 30 corresponding to the upper film pressing part 31 stops moving, and the lifting frame 30 corresponding to the lower film pressing part 31 starts to gradually move downward under the action of the corresponding external servo motor. The lower film pressing part 31 pulls the graphene film downward until the test section of the graphene film breaks, thereby performing a tensile test on the graphene film.

[0048] After the initial test is completed, the corresponding lifting frame 30 drives the lower film pressing part 31 to continuously move downward. It should be noted that during the process of pressing and compacting the pressing plate 310 in the above-mentioned embodiment 320, the return spring 316 is compressed. Therefore, when the two pressing plates 310 in the lower film pressing part 31 continuously move downward to release the contact with the implementation strip 320, the elastic force generated by the deformation of the return spring 316 causes the two pressing plates 310 in this film pressing part 31 to bounce away from each other front and back. At this time, the graphene film broken during the tensile test automatically detaches, and the two pressing plates 310 in the lower film pressing part 31 move to directly below the U-shaped area of the avoidance frame 314. The lower film pressing part 31 moves upward, and the corresponding two pressing plates 310 continuously move upward through the U-shaped area of the avoidance frame 314. At the same time, the original upper film pressing part 31 drives the clamped graphene film downward, and the two film pressing parts 31 exchange positions.

[0049] It should be further noted that during the above process, the upward movement of the pressing plate 310 is avoided through the U-shaped area of the avoidance frame 314, and the second tensile test is carried out. After the second tensile test is completed, the reinstallation operation needs to be carried out again. At this time, the other lifting frame 30 needs to drive the film pressing part 31 upward. Then, the two deflection motors 318 operate in sequence, so that the two rotating shafts 313 drive the avoidance frame 314 to rotate 180 degrees in sequence, thereby adjusting the U-shaped area of the avoidance frame 314 to facilitate adapting to the upward reinstallation process of the two film pressing parts 31. Then, the corresponding lifting frame 30 is made to move upward and the reinstallation operation is carried out.

[0050] As Figure 1 、 Figure 2 and Figure 3 shown, the implementation part 32 further includes guiding strips 321. The guiding strips 321 are fixedly arranged on the upper end surface of the implementation strip 320. The two guiding strips 321 opposite to each other front and back are symmetrical. Taking the front guiding strip 321 as an example for description, the front guiding strip 321 slopes downward from front to back. Through the contact and cooperation between the guiding strip 321 and the contact roller 317 on the pressing plate 310, the pressing plate 310 is guided to re-enter between the two implementation strips 320 corresponding to the front and back.

[0051] For the reinstallation process of the graphene film, refer to Figure 6, after the compaction plate 310 in the lower film pressing part 31 detaches from the implementation strip 320, it moves upward. At this time, the corresponding two compaction plates 310 are respectively located below the corresponding guiding strips 321. As the compaction plate 310 continues to move upward, the compaction plate 310 cooperates with the outer inclined surface of the corresponding guiding strip 321, causing the two compaction plates 310 to move away from each other, and the return spring 316 is stretched. After the compaction plate 310 moves above the guiding strip 321, the elastic force generated by the deformation of the return spring 316 causes the two compaction plates 310 to reset and move above the two guiding strips 321. Then, the lifting frame 30 drives the two compaction plates 310 to move downward. Through the cooperation between the compaction plate 310 and the inclined surface on the upper side of the guiding strip 321, the two compaction plates 310 approach each other and continue to move downward. Finally, the two compaction plates 310 move back between the front and rear implementation strips 320. At this time, the two compaction plates 310 re - press the graphene film, and the return spring 316 is compressed, that is, the reinstallation action is completed. Then, the tensile test is carried out again.

[0052] As Figure 1 , Figure 2 , Figure 7 and Figure 8 shown, a locking part 34 for locking the implementation strip 320 and the compaction plate 310 is provided on the lifting frame 30 during the tensile test. The locking part 34 includes a locking column 340. Two locking columns 340 which are distributed front - to - back and have vertical axes are fixedly arranged on the end face of the longitudinal section of the lifting frame 30 facing the implementation strip 320 through a horizontal frame. The upper end face of the locking column 340 is chamfered. The locking column 340 corresponds to the adjacent implementation strip 320. A matching block 341 is rotatably arranged on the end face of the implementation strip 320 facing the corresponding locking column 340. A locking groove 342 is opened on the matching block 341. The lower end opening of the locking groove 342 is chamfered. A scroll spring 343 is fixedly arranged between the matching block 341 and the implementation strip 320.

[0053] After completing the clamping action or reinstallation action, the two film pressing parts 31 move downward synchronously. During the downward movement of the upper compaction plate 310 and the lifting frame 30, the lifting frame 30 drives the horizontal frame and the locking column 340 thereon to move downward synchronously. During the downward movement of the horizontal frame, it squeezes the matching block 341 and causes the matching block 341 to rotate. During this process, the scroll spring 343 deforms. When the horizontal frame and the locking column 340 move below the matching block 341, the elastic force generated by the deformation of the scroll spring 343 causes the matching block 341 to reset to the initial horizontal state. Then, the two film pressing parts 31 move upward, so that the two locking columns 340 on the upper lifting frame 30 are inserted into the corresponding locking grooves 342, thereby locking the implementation strip 320. Then, the subsequent tensile test is carried out, improving the stability during the tensile test.

[0054] It should be further noted that during the reinstallation process of the film pressing part 31, since the compaction plate 310 moves upward from the outside of the implementation strip 320 during this process, the locking column 340 will not contact the locking groove 342 during the upward movement, so there is no problem of the locking column 340 being stuck with the locking groove 342.

[0055] As Figure 1 , Figure 2 , Figure 4 and Figure 5 shown, the flattening part 33 further includes a sliding rod 331. The moving plate 312 is slidably penetrated from front to back by a sliding rod 331 with an axis extending from front to back. The flattening plate 330 is fixedly arranged at one end of the sliding rod 331 close to the implementation strip 320. A pressing spring 332 sleeved on the sliding rod 331 is fixedly arranged between the flattening plate 330 and the moving plate 312. A plurality of flattening rollers 333 are rotatably arranged on the opposite surfaces of two adjacent flattening plates 330 in the front-rear direction, which are arranged at equal intervals from top to bottom and have an axis extending from left to right.

[0056] As Figure 4 shown, four plug-in cylinders 334 arranged in a matrix are fixedly arranged on the front end face of the rear flattening plate 330. A plug-in column 335 matched with the plug-in cylinder 334 is fixedly arranged on the rear end face of the front flattening plate 330. The distance between the two flattening plates 330 is limited by inserting the plug-in column 335 into the corresponding plug-in cylinder 334, and at the same time, the two flattening plates 330 form an integral framework.

[0057] As Figure 4 and Figure 5 shown, two horizontal rods 336 arranged vertically and with an axis extending from left to right are fixedly arranged on the end face of the sliding rod 331 far from the implementation strip 320 through a rectangular block. Two symmetric V-shaped plates 337 are fixedly arranged on the longitudinal section of the lifting frame 30. The V-shaped openings of the two opposite V-shaped plates 337 in the front-rear direction are distributed oppositely.

[0058] Before the stretching operation, during the process of the two moving plates 312 approaching each other, the moving plate 312 drives the flattening plate 330 thereon to move synchronously through the sliding rod 331. Finally, the plug-in column 335 on the front flattening plate 330 is inserted into the corresponding plug-in cylinder 334 on the rear flattening plate 330, controlling the distance between the flattening rollers 333 on the two flattening plates 330, maintaining the flattening effect of the flattening rollers 333 on the graphene film while avoiding the problem that the flattening rollers 333 interfere with the stretching test process and affect the test results. At the same time, the smoothness of the flattening action during the stretching test is improved by forming an integral framework. It should be noted that the flattening action helps to make the stretching stress evenly distributed on the graphene film, avoid introducing additional stress concentration points due to wrinkled or bent parts, reduce errors, and improve the accuracy of the data.

[0059] Secondly, during the process of the lifting frame 30 driving the compaction plate 310 to move upward and reset, and during the process of the lifting frame 30 driving the compaction plate 310 to move downward, the lifting frame 30 drives the V-shaped plate 337 thereon to move synchronously. During the upward movement of the V-shaped plate 337, the upper inclined section thereof cooperates with the corresponding horizontal rod 336. During the downward movement of the V-shaped plate 337, the lower inclined section thereof cooperates with the corresponding horizontal rod 336, so that the horizontal rod 336 drives the screed 330 to move synchronously through the rectangular block, so that the two screeds 330 move out from between the two adjacent implementation strips 320 on the left and right, that is, the two screeds 330 move away from each other, and the abutting spring 332 is continuously compressed, so as to avoid the process of the compaction plate 310 moving up and down. After avoiding the movement of the compaction plate 310, the V-shaped plate 337 is disengaged from the horizontal rod 336, and the screed 330 is reset. Therefore, after the compaction plate 310 moves downward to reinstall the graphene film, the screed 330 re-enters the smoothing state, which is convenient for performing the tensile test again.

[0060] During the evaluation of the tensile properties of the graphene film, first, the deformation condition of the graphene film during the stretching process is accurately monitored and data is collected through the monitoring device, and the images monitored and collected by the monitoring device are analyzed and processed by combining with the data analysis software to obtain the deformation amount. Finally, the tensile mechanical properties of the graphene film are calculated and evaluated through the deformation amount and the magnitude of the tensile force. Among them, both the monitoring device and the data analysis software are existing technologies (not shown in the accompanying drawings of the specification). The monitoring device can be an AFM atomic force microscope, which can capture the morphological changes on the surface of the graphene film in real time at the nanoscale and provide high-resolution image data for the monitoring of the deformation amount; and the data analysis software can adopt ImageJ software and Vicon software, and the ImageJ software and the Vicon software cooperate to calculate the deformation amount of the graphene film.

[0061] In addition, the present invention also provides a tensile test method for manufacturing a graphene film, including the following steps: S1. Install the graphene film: Manually install the graphene film roll to be subjected to the tensile test on the mounting seat 2, and make the lower end of the graphene film pass through the two film pressing parts 31 from top to bottom in sequence, and make the graphene film located between the two compaction plates 310 in the same film pressing part 31.

[0062] S2. Press the graphene film: The external hydraulic cylinder works to make the two moving plates 312 approach each other, and the moving plates 312 drive the implementation strips 320 thereon to move synchronously. Finally, the implementation strips 320 on the front and rear sides are both abutted against the corresponding compaction plates 310, so that the two compaction plates 310 in the film pressing part 31 press the graphene film, and at the same time, the two screeds 330 in the smoothing part 33 are closed to complete the smoothing action.

[0063] S3, locking the film pressing part 31: the external servo motor works to move the two film pressing parts 31 upward, so that the two locking columns 340 on the upper lifting frame 30 are inserted into the corresponding locking grooves 342, thereby locking the implementation bar 320 and indirectly locking the film pressing action of the compacting plates 310 in the two film pressing parts 31.

[0064] S4, initial tensile test: the upper film pressing part 31 stops moving, and the lower film pressing part 31 continues to move downward under the drive of the corresponding external servo motor. The lower film pressing part 31 applies a downward pulling force to the graphene film until the graphene film is broken. The applied pulling force and the corresponding deformation are recorded to complete the initial tensile test.

[0065] S5. Reinstalling the graphene film: the external servo motor works, so that the upper film pressing part 31 moves downward continuously, driving one end of the graphene film to be tested to move downward continuously, and at the same time, the lower film pressing part 31 moves downward first, so that the compacting plate 310 releases the contact with the implementation bar 320, and the graphene film that was broken in the initial tensile test in step S4 automatically detaches. During the up and down movement of the above-mentioned film pressing part 31, the smoothing plate 330 releases the smoothing state and avoids the movement of the compacting plate 310, and the lower film pressing part 31 moves upward to cooperate with the guide bar 321, and re-enters the state of pressing the graphene film between the front and rear implementation bars 320, and at the same time, the smoothing plate 330 re-enters the smoothing state, and the reinstallation action is completed.

[0066] S6. Repeat the tensile test: Repeat the locking action in step S3, then perform the tensile test again, and repeatedly collect the applied tensile force and deformation.

[0067] S7. Collect data: After repeated tensile tests, multiple sets of applied tensile forces and corresponding deformations are obtained, and the real mechanical properties of the graphene film are evaluated based on the obtained data.

[0068] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tensile test device for manufacturing graphene membranes, which is used in conjunction with a monitoring device for monitoring and collecting images of the deformation of graphene membranes and data analysis software for analyzing and processing the images; characterized in that, Including: A test bench, on which a mounting seat is fixedly arranged. The graphene film roll to be tested is installed above the mounting seat. A stretching mechanism for performing multiple stretching tests on the graphene film is arranged on the test bench. The stretching mechanism includes a lifting frame. Lifting frames are slidably arranged up and down on the left and right end faces of the mounting seat. Pressing film parts are arranged on the opposite faces of the two lifting frames. The pressing film part includes two symmetrically arranged compaction plates in the front and back. Rubber plates are fixedly arranged on the opposite faces corresponding to the two compaction plates. The two pressing film parts are staggered up and down. An implementation part for driving the corresponding compaction plate to compact the graphene film is arranged on the test bench. The implementation part includes four implementation bars distributed in a rectangle. When the compaction plate moves to be opposite to the implementation bar in the front and back, the two corresponding implementation bars approach each other to perform the compaction action of the compaction plate. When the lower pressing film part continues to move down and the compaction plate disengages from the implementation bar, the pressing film part releases the pressing film action. Two flattening parts are arranged on the test bench and are both located between the two pressing film parts. The flattening part includes two symmetrically arranged flattening plates in the front and back. The graphene film is kept flat in the stretching area by the two flattening plates approaching each other. A locking part for locking the implementation bar and the compaction plate during the stretching test is arranged on the lifting frame.

2. The tensile testing device for manufacturing a graphene film according to claim 1, wherein: A mounting frame is fixedly arranged on the test bench and is located in front of the mounting seat. Moving plates are slidably arranged back and forth on the opposite faces of the mounting frame and the mounting seat. Two rotating shafts are rotatably arranged on the moving plate and are distributed up and down. Avoidance frames are fixedly sleeved on the rotating shafts. Connecting plates are rotatably arranged on the avoidance frames. The two left-right opposite implementation bars are fixedly arranged on the two up-down opposite connecting plates.

3. The stretching test device for manufacturing graphene film according to claim 1, characterized in that: A return spring is fixedly arranged between the two mounting blocks on the same lifting frame. When the compaction plate moves down and disengages from the implementation bar, the two corresponding compaction plates move away from each other through the return spring to release the graphene film.

4. A tensile testing device for manufacturing a graphene film according to claim 1, wherein: The pressing film part further includes contact rollers. Four contact rollers arranged in a matrix are rotatably arranged on the opposite backs of the two front-back opposite compaction plates. The axis of the contact roller extends from left to right.

5. A tensile test device for manufacturing a graphene film according to claim 2, characterized in that: The avoidance frame is U-shaped. The horizontal length of the U-shaped area of the avoidance frame is greater than half of the horizontal length of the compaction plate. Deflection motors connected to the rotating shafts one by one are fixedly arranged on the moving plate. The orientation of the U-shaped opening on the avoidance frame is controlled by the deflection motor to avoid the moving process of the corresponding compaction plate.

6. The tensile testing device for manufacturing a graphene film according to claim 1, wherein: The implementation part further includes guiding bars. Guiding bars are fixedly arranged on the upper end faces of the implementation bars. The two front-back opposite guiding bars are symmetrically arranged in the front and back. The front guiding bar slopes downward from front to back.

7. The tensile testing device for manufacturing graphene films according to claim 1, wherein: The locking part includes locking columns. Two locking columns with vertical axes and distributed in the front and back are fixedly arranged on the end face of the longitudinal section of the lifting frame facing the implementation bar through a horizontal frame. The locking columns correspond to the adjacent implementation bars. A matching block is rotatably arranged on the end face of the implementation bar facing the corresponding locking column. A locking groove is opened on the matching block. A scroll spring is fixedly arranged between the matching block and the implementation bar.

8. A tensile testing device for manufacturing a graphene film according to claim 2, characterized in that: The smoothing part also includes a sliding rod, and a sliding rod with an axis extending from front to rear is passed through the moving plate for sliding back and forth. The smoothing plate is fixedly arranged at one end of the sliding rod close to the implementation strip, and a clamping spring mounted on the sliding rod is fixedly arranged between the smoothing plate and the moving plate. A plurality of smoothing rollers equidistantly arranged from top to bottom and with axes extending from left to right are rotatably arranged on the opposite surfaces of the two adjacent front and rear smoothing plates. Four plug-in cylinders arranged in a matrix are fixedly arranged on the front end surface of the rear smoothing plate, and a plug-in column cooperating with the plug-in cylinder is fixedly arranged on the rear end surface of the front smoothing plate.

9. The tensile testing device for manufacturing a graphene film according to claim 8, wherein: The end surface of the sliding rod away from the implementation strip is fixedly provided with two horizontal rods distributed up and down and with axes extending from left to right through a rectangular block, and two front-to-back symmetrical V-shaped plates are fixedly provided on the longitudinal section of the lifting frame, and the V-shaped openings of the two front-to-back V-shaped plates are relatively distributed.

10. A tensile test method for manufacturing a graphene film, which is completed in cooperation with a tensile test device for manufacturing a graphene film according to any one of claims 1 to 9, characterized in that, The following steps are involved: S1. Installing the graphene film: manually installing the graphene film roll to be stretched on the mounting seat, and making the lower end of the graphene film pass through the two film pressing parts from top to bottom in sequence, and making the graphene film located between the two compacting plates in the same film pressing part; S2, pressing the graphene film: the implementation bars on the front and rear sides are pressed against the corresponding pressing plates, so that the two pressing plates in the film pressing part press the graphene film, and at the same time, the two smoothing plates in the smoothing part are closed to complete the smoothing action; S3, locking the film pressing part: the two film pressing parts move upward so that the locking part locks the implementation strip and indirectly locks the film pressing action; S4, initial tensile test: the upper film pressing part stops moving, and the lower film pressing part applies a downward pulling force to the graphene film until the graphene film is broken, and the applied pulling force and the corresponding deformation are recorded to complete the initial tensile test; S5, reinstalling the graphene film: the upper film pressing part continuously moves downward, driving one end of the graphene film to be tested to continuously move downward, and at the same time, the lower film pressing part moves downward, so that the pressing plate is released from contact with the implementation bar, and the graphene film that was broken in the initial tensile test in step S4 is automatically detached. During the process of the film pressing part moving up and down, the smoothing plate is released from the smoothing state and avoids the movement of the compacting plate, and the lower film pressing part moves upward to cooperate with the guide bar and re-enters the state where the front and rear implementation bars press the graphene film, and the smoothing plate re-enters the smoothing state, thus completing the reinstallation action; S6, repeat the tensile test: repeat the locking action in step S3, then perform the tensile test again, and repeatedly collect the applied tensile force and deformation; S7. Collect data: After repeated tensile tests, multiple sets of applied tensile forces and corresponding deformations are obtained, and the real mechanical properties of the graphene film are evaluated based on the obtained data.

Images