A tensile testing device and method for graphene film manufacturing

Abstract

The present invention relates to the technical field of graphene film manufacturing, specifically a tensile testing device and method for graphene film manufacturing, comprising a test bench, a stretching mechanism, a die portion, an implementation portion, and a smoothing portion. In the present invention, the two die portions are exchanged up and down, and the lower die plate is continuously moved downward to separate from the implementation bar to achieve the reassembly action, thereby being able to automatically and randomly perform the tensile testing action of the graphene film in the graphene film roll, without the need to repeat the clamping and disassembly steps multiple times, thereby improving the convenience and efficiency of the tensile testing process and facilitating batch multiple tensile tests. Secondly, the tensile stress is evenly distributed on the graphene film by the mutual approaching action of the corresponding two smoothing plates in the smoothing portion, thereby avoiding the introduction of additional stress concentration points due to wrinkles or bent parts, reducing errors, and improving the accuracy of the data.

Description

Technical Field

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

[0002] 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 film has broad application prospects in electronic devices, sensors, energy storage and conversion, composite materials and other fields.

[0003] Graphene membranes may be subjected to varying degrees of tensile stress in practical applications. Therefore, during the manufacturing process of graphene membranes, it is necessary to evaluate their mechanical properties by performing tensile tests on the graphene membranes, especially key indicators such as tensile strength and elastic modulus.

[0004] Currently, multiple graphene film splines are usually cut from a graphene film roll, and the splines are fixed to a tensile testing machine in turn. Tensile force is gradually applied until the material breaks, and the applied tensile force and the corresponding deformation are recorded to calculate the required mechanical performance parameters. At this point, the tensile test of a single spline is completed. The above process is then repeated to perform tensile tests on multiple splines, and finally multiple sets of spline data are obtained, and the spline data reflects the true mechanical properties of the graphene film.

[0005] The current tensile testing process for graphene membranes has the following problems: 1. It is necessary to manually cut multiple strips from the graphene membrane roll and clamp them one by one into the tensile testing machine for testing. 2. After completing a single test, the tested strips need to be disassembled. The overall process is cumbersome and not conducive to batch tensile testing of graphene membranes. The overall operation efficiency is low. 3. In addition, during the stretching process, the graphene membrane strips will generate local stress after being subjected to tensile stress, causing wrinkles in some areas of the graphene membrane (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 graphene film manufacturing, aiming to solve the problems of the above-mentioned prior art.

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

[0008] The stretching mechanism includes a lifting frame, and the left and right end surfaces of the mounting seat are both provided with lifting frames for sliding up and down. The opposite surfaces of the two lifting frames are provided with film pressing parts, and the film pressing parts include two front-to-back symmetrical compacting plates, and the opposite surfaces of the two compacting plates are fixedly provided with rubber plates. The two film pressing parts are staggered up and down. After the graphene film is compacted by the compacting plates, the lower side film pressing part moves downward for stretching.

[0009] The test bench is provided with an implementation part for driving the corresponding two compacting plates to compact the graphene film. The implementation part includes four rectangularly distributed implementation bars. When the compacting plate moves to be relative to the front and back of the implementation bars, the corresponding two implementation bars approach each other to perform the compacting action of the compacting plate. When the lower side film pressing part continues to move downward so that the compacting plate is separated from the implementation bar, the film pressing part releases the film pressing action.

[0010] The test bench is provided with two smoothing parts, both located between the two film pressing parts, and the smoothing parts include two front-to-back symmetrical smoothing plates. The two smoothing plates are close to each other so that the graphene film remains straight in the stretching area.

[0011] According to a favorable embodiment, the test bench is fixedly provided with a mounting bracket located in front of the mounting seat, and movable plates are provided on the opposite surfaces of the mounting bracket and the mounting seat for sliding back and forth. Two rotating shafts distributed up and down are rotatably provided on the movable plate, and an avoidance bracket is fixedly sleeved on the rotating shaft. A connecting plate is rotatably provided on the avoidance bracket, and two implementation bars opposite to each other on the left and right are fixedly provided on two connecting plates opposite to each other up and down.

[0012] According to a favorable embodiment, a reset spring is fixedly provided between the two mounting blocks on the same lifting frame. When the compacting plate moves downward and disengages from the implementation bar, the reset spring moves the corresponding two compacting plates away from each other, loosening the graphene membrane.

[0013] According to an advantageous embodiment, the laminating section further comprises contact rollers, and four contact rollers arranged in a matrix are rotatably provided on opposite back surfaces of the two front and rear pressing plates, with axes of the contact rollers extending from left to right.

[0014] According to a favorable embodiment, the avoidance frame is U-shaped, and the horizontal length of the U-shaped area of ​​the avoidance frame is greater than half of the horizontal length of the compaction plate. A deflection motor is fixedly provided on the movable plate and is connected to the rotating shaft in a one-to-one correspondence. The direction of the U-shaped opening on the avoidance frame is controlled by the deflection motor to avoid the movement process of the corresponding compaction plate.

[0015] According to an advantageous embodiment, the implementation portion further comprises a guide bar, the upper end surface of the implementation bar is fixedly provided with a guide bar, the two front and rear opposite guide bars are symmetrical, and the front guide bar is inclined downward from front to back.

[0016] According to a favorable embodiment, the lifting frame is provided with a locking portion for locking the implementation bar and the compaction plate during the tensile test, the locking portion including a locking column, and two locking columns distributed front and back and with vertical axes are fixedly provided on the longitudinal section of the lifting frame toward the end surface of the implementation bar through a horizontal frame, the locking columns correspond to adjacent implementation bars, and the implementation bar is provided with a mating block that is rotated toward the end surface of the corresponding locking column, the mating block is provided with a locking groove, and a spiral spring is fixedly provided between the mating block and the implementation bar.

[0017] According to a favorable embodiment, the smoothing part also includes a sliding rod, and a sliding rod with an axis extending from front to rear is passed through the movable plate for sliding back and forth. The smoothing plate is fixedly arranged on one end of the sliding rod close to the implementation bar, and a tightening spring mounted on the sliding rod is fixedly arranged between the smoothing plate and the movable plate. The opposite surfaces of the two adjacent front and rear smoothing plates are rotatably provided with a plurality of smoothing rollers arranged equidistantly from top to bottom and with axes extending from left to right. The front end surface of the rear smoothing plate is fixedly provided with four plug-in cylinders arranged in a matrix, and the rear end surface of the front smoothing plate is fixedly provided with a plug-in column cooperating with the plug-in cylinder.

[0018] According to a preferred embodiment, the end surface of the sliding plate 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.

[0019] In summary, the present invention includes at least one of the following beneficial effects: First, in the present invention, the reassembly action is achieved by exchanging the positions of the two film pressing parts up and down and continuously moving the lower side pressure plate downward to separate from the implementation bar, so that 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, thereby improving the convenience and efficiency of the tensile test process and facilitating batch multiple tensile tests. Secondly, through the mutual approach of the corresponding two smoothing plates in the smoothing part, the tensile stress is evenly distributed on the graphene film, avoiding the introduction of additional stress concentration points due to wrinkles or bent parts, reducing errors, and improving the accuracy of the data.

[0020] 2. In the present invention, the plug-in column is inserted into the plug-in tube to control the distance between the smoothing rollers on the two smoothing plates, thereby maintaining the smoothing effect of the smoothing rollers on the graphene film and avoiding the problem of the smoothing rollers interfering with the tensile test process and affecting the test results. At the same time, the smoothness of the smoothing action during the tensile test is improved by forming an overall frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the three-dimensional structure of a tensile testing device for graphene film manufacturing provided according to an embodiment of the present invention is shown.

[0023] Figure 2 A right side view of a tensile testing device for graphene film manufacturing provided according to an embodiment of the present invention is shown.

[0024] Figure 3 A right side view is shown between a compacting plate, an implementing bar and a contact roller according to an embodiment of the present invention.

[0025] Figure 4 A right side view of the implementation bar, the smoothing plate and the smoothing roller provided according to an embodiment of the present invention is shown.

[0026] Figure 5 A partial cross-sectional perspective diagram of the movable plate, the implementation bar and the avoidance frame provided according to an embodiment of the present invention is shown.

[0027] Figure 6 A schematic diagram showing the state change of the two film pressing parts moving up and down and switching according to an embodiment of the present invention is shown.

[0028] Figure 7 The embodiment of the present invention provides Figure 6 Enlarged view of point A in the middle.

[0029] Figure 8 The embodiment of the present invention provides Figure 6 Enlarged view of point B in the middle.

[0030] Figure 9 A schematic diagram showing the desired effect after smoothing by the smoothing portion provided in an embodiment of the present invention is shown.

[0031] 3. The above drawings include the following reference numerals: 1. test bench; 2. mounting seat; 3. stretching mechanism; 30. lifting frame; 300. screw rod; 301. mounting frame; 31. film pressing part; 310. compacting plate; 311. rubber plate; 312. moving plate; 313. rotating shaft; 314. avoidance frame; 315. connecting plate; 316. reset spring; 317. contact roller; 318. deflection motor; 32. implementation part; 320. implementation bar; 321. guide bar; 33. smoothing part; 330. smoothing plate; 331. sliding rod; 332. pressing spring; 333. smoothing roller; 334. plug-in cylinder; 335. plug-in column; 336. horizontal rod; 337. V-shaped plate; 34. locking part; 340. locking column; 341. matching block; 342. locking groove; 343. scroll spring. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

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

[0034] like Figure 1 、 Figure 2 and Figure 3As shown, the stretching mechanism 3 includes a lifting frame 30, and L-shaped lifting frames 30 are provided on the left and right end surfaces of the mounting seat 2 for sliding up and down. The opposite surfaces of the two lifting frames 30 are provided with a film pressing part 31, and the film pressing part 31 includes two front-to-back symmetrical compacting plates 310. In order to improve the compacting force of the two compacting plates 310 on the graphene film in the same film pressing part 31, rubber plates 311 are fixedly provided on the opposite surfaces of the corresponding two compacting plates 310. By deforming the rubber plates 311 when compacting the graphene film, the friction between the compacting plates 310 and the graphene film is increased, which is convenient for subsequent tensile testing. The compacting plates 310 are set on the longitudinal section of the corresponding lifting frame 30 by sliding back and forth through the mounting block. The two film pressing parts 31 are staggered up and down. After the graphene film is compacted by the compacting plates 310, the lower side film pressing part 31 moves down for tensile testing.

[0035] like Figure 1 、 Figure 2 and Figure 3 As shown, the test bench 1 is provided with an implementation unit 32 for driving two compacting plates 310 within the same film pressing unit 31 to compact the graphene film. The implementation unit 32 includes four rectangularly arranged implementation bars 320. When the compacting plates 310 within the film pressing unit 31 move to a position facing the implementation bars 320, the front and rear facing implementation bars 320 approach each other to implement the compacting action of the compacting plates 310. When the lower film pressing unit 31 continues to move downward, causing the compacting plates 310 to separate from the implementation bars 320, the film pressing unit 31 stops the film pressing action.

[0036] like Figure 1 、 Figure 2 and Figure 4 As shown, the test bench 1 is provided with two smoothing parts 33 located between the two film pressing parts 31. The smoothing part 33 includes two front-to-back symmetrical smoothing plates 330. The two smoothing plates 330 are close to each other so that the graphene film remains straight in the stretching area.

[0037] During operation, the graphene film roll that needs to be tensile tested is first manually installed on the mounting seat 2, and the lower end of the graphene film is passed through the two film pressing parts 31 from top to bottom in sequence, and the two implementation bars 320 in the implementation part 32 are close to each other, and the implementation bars 320 contact the adjacent compacting plates 310 and press the compacting plates 310, and finally the two compacting plates 310 in the same film pressing part 31 are pressed front and back, so that the upper and lower ends of the selected graphene film are both pressed and clamped. Secondly, in the above-mentioned pressing process, the two smoothing plates 330 in the same smoothing part 33 are also made close to each other, contacting the graphene film but not pressing the graphene film, so as to ensure that the graphene film is in a flat state during the subsequent tensile test, and avoid the problem of stress concentration in certain areas (and failure to be evenly distributed on the entire sample) affecting the authenticity of the test results.

[0038] Secondly, after the graphene film is compressed as described above, the upper pressing portion 31 remains stationary, and with the position of the upper pressing portion 31 as the reference position, the lower pressing portion 31 moves downward to pull the graphene film, thereby stretching the graphene film until the section of the graphene film is stretched and broken, thereby completing the tensile test of the section of the graphene film.

[0039] After the initial stretching test is completed, the above-mentioned lower side film pressing part 31 moves downward, and the compacting plate 310 therein is separated from the contact with the implementation bar 320, thereby causing the compacting plate 310 to release the pressing action on the graphene film, so that the graphene film at one end that was broken during the initial stretching automatically falls off, and at this time, the two compacting plates 310 in the film pressing part 31 move to the front and rear sides of all the implementation bars 320 respectively, and then the film pressing part 31 moves upward, and the upper film pressing part 31 continues to move downward while maintaining the pressing state on the graphene film, and finally the positions of the two film pressing parts 31 are exchanged, and in the process of exchanging positions, the original upper film pressing part 31 pulls the graphene film downward, and after the original lower side film pressing part 31 moves upward, the compacting plate 310 inside it contacts and cooperates with the implementation bar 320 again, and re-compacts the corresponding graphene film, realizing the re-installation action of the graphene film after the initial stretching test, and then the stretching test operation can be carried out again without the need for manual repeated clamping.

[0040] like Figure 2 As shown, sliding blocks are provided on both left and right end surfaces of the mounting seat 2 for sliding up and down movement, and the lifting frame 30 is fixedly provided on the corresponding sliding blocks. A screw rod 300 corresponding to the sliding blocks is rotatably provided on the mounting seat 2, and the screw rod 300 is threadedly matched with the sliding block, and the screw rod 300 is connected to an external servo motor (not shown in the figure).

[0041] During operation, the external servo motor drives the screw rod 300 to rotate forward and reverse, and cooperates with the thread between the screw rod 300 and the sliding block to enable the sliding block to move up and down. The sliding block drives the corresponding film pressing part 31 to move up and down through the lifting frame 30, which is convenient for tensile testing and re-installing film pressing. Secondly, the external servo motor can achieve precise tensile loading.

[0042] like Figure 1 、 Figure 2 and Figure 5 As shown, the test bench 1 is fixedly provided with a mounting frame 301 located in front of the mounting seat 2, and movable plates 312 are provided on the opposite surfaces of the mounting frame 301 and the mounting seat 2 for sliding back and forth. The movable plate 312 is driven by an external hydraulic cylinder to move back and forth, and two rotating shafts 313 distributed vertically are rotatably provided on the movable plate 312. A avoidance frame 314 is fixedly sleeved on the rotating shaft 313, and a connecting plate 315 is rotatably provided on the avoidance frame 314. Two left and right opposite implementation bars 320 are fixedly provided on the two upper and lower opposite connecting plates 315.

[0043] like Figure 1 、 Figure 2 and Figure 3 As shown, a reset spring 316 is fixedly provided between the two mounting blocks on the same lifting frame 30. When the compacting plate 310 moves downward and disengages from the implementation bar 320, the reset spring 316 moves the corresponding two compacting plates 310 away from each other, loosening the graphene membrane.

[0044] like Figure 1 and Figure 3 As shown, the film pressing part 31 also includes a contact roller 317. Four contact rollers 317 arranged in a matrix are rotatably provided on the opposite back surfaces of the two front and rear compacting plates 310. The axis of the contact roller 317 extends from left to right. The contact roller 317 and the implementation bar 320 are in rolling contact instead of the compacting plate 310 directly sliding in contact with the implementation bar 320, thereby reducing friction loss.

[0045] like Figure 1 and Figure 5 As shown, the avoidance frame 314 is U-shaped, and 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 is fixedly provided on the movable plate 312 and is connected to the rotating shaft 313 in a one-to-one correspondence. The deflection motor 318 controls the direction of the U-shaped opening on the avoidance frame 314 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 membrane passes through the two film pressing parts 31 from top to bottom in sequence, the external hydraulic cylinder works to make the two movable plates 312 approach each other, and the movable plates 312 drive the implementation bars 320 thereon to move synchronously. Finally, the implementation bars 320 on both sides of the front side are pressed against the corresponding compacting plates 310. At this time, the contact roller 317 on the compacting plate 310 contacts the implementation bar 320, and the sliding contact is replaced by rolling contact. While the implementation bar 320 applies pressure to the compacting plate 310, it facilitates the compacting plate 310 to move up and down, that is, while maintaining the pressure on the graphene membrane, the tensile test and the reinstallation of the upper film pressing part 31 are performed.

[0047] After the implementation bar 320 is pressed against the compacting 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 begins to move downward gradually 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 continue to move downward. It should be noted that in the process of the above-mentioned implementation bar 320 pressing the compacting plate 310, the return spring 316 is compressed. Therefore, when the two compacting plates 310 in the lower film pressing part 31 continue to move downward to release the contact with the implementation bar 320, the elastic force generated by the deformation of the return spring 316 causes the two compacting plates 310 in the film pressing part 31 to bounce away from each other. At this time, the graphene film that was broken during the tensile test automatically detaches, and the two compacting plates 310 in the lower film pressing part 31 move to just below the U-shaped area of ​​the avoidance frame 314, and the lower film pressing part 31 moves upward, and the corresponding two compacting plates 310 continue to 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 graphene film clamped thereon to move downward, and the two film pressing parts 31 exchange positions.

[0049] It should be additionally explained that, in the above process, the U-shaped area of ​​the avoidance frame 314 is used to avoid the upward movement of the compaction plate 310, and then a second tensile test is carried out. After completing the second tensile test, the reinstallation action needs to be performed again. At this time, the lifting frame 30 on the other side needs to drive the film pressing part 31 to move upward, and 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 turn, thereby adjusting the U-shaped area of ​​the avoidance frame 314 to facilitate the upward movement and reinstallation process of the two film pressing parts 31, and then the corresponding lifting frame 30 is moved upward and the reinstallation action is performed.

[0050] like Figure 1 、 Figure 2 and Figure 3 As shown, the implementation part 32 also includes a guide bar 321. The upper end surface of the implementation bar 320 is fixedly provided with a guide bar 321. The two guide bars 321 opposite to each other are symmetrical front to back. Taking the front guide bar 321 as an example, the front guide bar 321 is inclined downward from front to back. Through the contact and cooperation between the guide bar 321 and the contact roller 317 on the compaction plate 310, the compaction plate 310 is guided to re-enter between the two corresponding implementation bars 320 in the front and rear.

[0051] The graphene membrane reassembly process is shown in Figure 6The pressing plate 310 in the lower side pressing film part 31 moves upward after being separated from the implementation bar 320. At this time, the corresponding two pressing plates 310 are respectively located under the corresponding guide bars 321. As the pressing plate 310 continues to move upward, the pressing plate 310 cooperates with the outer inclined surface of the corresponding guide bar 321, so that the two pressing plates 310 move away from each other, and the return spring 316 is stretched. As the pressing plate 310 moves to the top of the guide bar 321, the elastic force generated by the deformation of the return spring 316 causes the two pressing plates 310 to move away from each other. 310 is reset and moved to the top of the two guide bars 321, and then the lifting frame 30 drives the two compacting plates 310 to move downward. Through the cooperation between the compacting plates 310 and the inclined surfaces on the upper sides of the guide bars 321, the two compacting plates 310 are close to each other and continue to move downward. Finally, the two compacting plates 310 are moved back to between the front and rear implementation bars 320. At this time, the two compacting plates 310 re-press the graphene membrane, and the reset spring 316 is compressed, that is, the reassembly action is completed, and then the tensile test is carried out again.

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

[0053] After the clamping action or the reinstalling action is completed, the two film pressing parts 31 move down synchronously. During the downward movement of the upper compacting plate 310 and the lifting frame 30, the lifting frame 30 drives the horizontal frame and the locking column 340 thereon to move down synchronously. During the downward movement of the horizontal frame, the matching block 341 is squeezed and the matching block 341 is rotated. During this process, the spiral spring 343 is deformed. When the horizontal frame and the locking column 340 move down to the bottom of the matching block 341, the elastic force generated by the deformation of the spiral spring 343 causes the matching block 341 to return to its initial horizontal state. Then the two film pressing parts 31 move up, so that the two locking columns 340 on the upper lifting frame 30 are stuck in the corresponding locking grooves 342, thereby locking the implementation bar 320, and then performing subsequent tensile tests, thereby improving the stability during the tensile test.

[0054] It should be additionally explained that during the upward movement and reinstallation of the film pressing part 31, since the compacting plate 310 moves upward from the outside of the implementation bar 320 during this process, the locking column 340 does not contact the locking groove 342 during the upward movement, so there is no problem of the locking column 340 and the locking groove 342 being stuck.

[0055] like Figure 1 、 Figure 2 、 Figure 4 and Figure 5 As shown, the smoothing portion 33 also includes a sliding rod 331, and the sliding rod 331 with an axis extending from front to back slides through the movable plate 312. The smoothing plate 330 is fixedly arranged on one end of the sliding rod 331 close to the implementation bar 320. A tightening spring 332 mounted on the sliding rod 331 is fixedly arranged between the smoothing plate 330 and the movable plate 312. The opposite surfaces of the two adjacent smoothing plates 330 are rotatably provided with a plurality of smoothing rollers 333 arranged equidistantly from top to bottom and with an axis extending from left to right.

[0056] like Figure 4 As shown, the front end surface of the rear side caressing plate 330 is fixedly provided with four plug-in tubes 334 arranged in a matrix, and the rear end surface of the front side caressing plate 330 is fixedly provided with plug-in columns 335 that cooperate with the plug-in tubes 334. The plug-in columns 335 are inserted into the corresponding plug-in tubes 334 to limit the distance between the two caressing plates 330, and at the same time, the two caressing plates 330 form an overall frame.

[0057] like Figure 4 and Figure 5 As shown, the end surface of the sliding rod 331 away from the implementation bar 320 is fixed with two horizontal rods 336 distributed up and down and with the axis extending from left to right through a rectangular block, and two front-to-back symmetrical V-shaped plates 337 are fixedly provided on the longitudinal section of the lifting frame 30, and the V-shaped openings of the two front-to-back V-shaped plates 337 are relatively distributed.

[0058] Before the stretching operation, when the two movable plates 312 approach each other, the movable plate 312 drives the smoothing plate 330 thereon to move synchronously through the sliding rod 331, and finally the plug-in column 335 on the front smoothing plate 330 is inserted into the plug-in cylinder 334 on the corresponding rear smoothing plate 330, thereby controlling the spacing between the smoothing rollers 333 on the two smoothing plates 330, maintaining the smoothing effect of the smoothing rollers 333 on the graphene film while avoiding the problem that the smoothing rollers 333 interfere with the stretching test process and affect the test results. At the same time, the smoothness of the smoothing action during the stretching test is improved by forming an overall frame. It should be noted that the smoothing action helps to evenly distribute the tensile stress on the graphene film, avoids the introduction of additional stress concentration points due to wrinkles or bent parts, reduces errors, and improves the accuracy of the data.

[0059] When the cam 330 is in the process of being moved up and down, the cam 330 of the present invention is in the process of being moved up and down, and the cam 330 of the present invention is in the process of being moved up and down, and the cam 330 of the present invention is in the process of being moved up and down, and the cam 330 of the present invention is in the process of being moved down and down.

[0060] In the process of evaluating the tensile properties of the graphene film, the deformation status of the graphene film during the stretching process is first accurately monitored and data is collected by monitoring equipment, and the images collected by the monitoring equipment are analyzed and processed in combination with data analysis software to obtain the deformation. Finally, the tensile mechanical properties of the graphene film are evaluated by calculating the deformation and the tensile force. The monitoring equipment and the data analysis software are both existing technologies (not shown in the drawings of the specification). The monitoring equipment can use an AFM atomic force microscope, which can capture the morphological changes of the surface of the graphene film in real time at the nanoscale, providing high-resolution image data for deformation monitoring; and the data analysis software can use ImageJ software and Vicon software. ImageJ software and Vicon software work together to calculate the deformation of the graphene film.

[0061] In addition, the present invention also provides a tensile testing method for graphene film manufacturing, comprising the following steps: S1, installing the graphene film: manually installing the graphene film roll that needs to be tensile tested on the mounting seat 2, and making the lower end of the graphene film pass through the two pressing parts 31 from top to bottom in sequence, and making the graphene film located between the two compacting plates 310 in the same pressing part 31.

[0062] S2. Compressing the graphene film: The external hydraulic cylinder works to make the two movable plates 312 approach each other, and the movable plates 312 drive the implementation bars 320 thereon to move synchronously. Finally, the implementation bars 320 on the front and rear sides are pressed against the corresponding compacting plates 310, so that the two compacting plates 310 in the film pressing part 31 compress the graphene film, and at the same time, the two smoothing plates 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 locked in 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 continues to move downward, driving one end of the graphene film to be tested to move continuously downward, 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, thus completing the reinstallation action.

[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. Data collection: After repeated tensile tests, multiple sets of applied tensile forces and corresponding deformations are obtained, and the actual mechanical properties of the graphene membrane 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 scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tensile testing device for graphene film manufacturing, used in conjunction with a monitoring device for monitoring and collecting images of graphene film deformation and data analysis software for analyzing and processing the images; characterized in that: include: A test bench, wherein a mounting seat is fixedly provided on the test bench, a graphene film roll to be tested is mounted above the mounting seat, and a stretching mechanism for performing multiple stretching tests on the graphene film is provided on the test bench; The stretching mechanism includes a lifting frame. The left and right end surfaces of the mounting seat are both provided with lifting frames for sliding up and down. The opposite surfaces of the two lifting frames are provided with a film pressing part. The film pressing part includes two front-to-back symmetrical pressing plates. The opposite surfaces of the two pressing plates are fixedly provided with rubber plates. The two film pressing parts are staggered up and down. The test bench is provided with an implementation part for driving the corresponding compacting plate to compact the graphene film. The implementation part includes four rectangularly distributed implementation bars. When the compacting plate moves to the front and rear of the implementation bars, the corresponding two implementation bars approach each other to perform the compacting action of the compacting plate. When the lower side of the film pressing part continues to move downward so that the compacting plate is separated from the implementation bars, the film pressing part stops the film pressing action. The test bench is provided with two smoothing parts, both located between the two film pressing parts. The smoothing parts include two front-to-back symmetrical smoothing plates. The two smoothing plates are close to each other so that the graphene film remains flat in the stretching area. The lifting frame is provided with a locking portion for locking the implementation bar and the compaction plate during the tensile test; A return spring is fixedly provided between the two mounting blocks on the same lifting frame. When the compacting plate moves downward and separates from the implementing bar, the return spring causes the corresponding two compacting plates to move away from each other, thereby releasing the graphene film. The implementation portion further includes a guide bar, the upper end surface of the implementation bar is fixedly provided with a guide bar; the two guide bars facing each other are symmetrical, and the front guide bar is inclined downward from front to back; The front end surface of the rear side caressing plate is fixedly provided with four plug-in sleeves arranged in a matrix, and the rear end surface of the front side caressing plate is fixedly provided with plug-in posts matched with the plug-in sleeves.

2. A tensile testing device for graphene film production according to claim 1, characterized in that: The test bench is fixedly provided with a mounting bracket located in front of the mounting seat, and movable plates are provided on the opposite surfaces of the mounting bracket and the mounting seat for sliding back and forth. Two rotating shafts distributed up and down are rotatably provided on the movable plate, and an avoidance bracket is fixedly sleeved on the rotating shaft. A connecting plate is rotatably provided on the avoidance bracket, and two implementation bars opposite to each other on the left and right are fixedly provided on the two connecting plates opposite to each other up and down.

3. The tensile testing device for graphene film production according to claim 1, characterized in that: The film pressing part also includes contact rollers. Four contact rollers arranged in a matrix are rotatably provided on the opposite back surfaces of the two front and rear pressing plates, and the axes of the contact rollers extend from left to right.

4. A tensile testing device for graphene film production according to claim 2, characterized in that: The avoidance frame is U-shaped, and the horizontal length of the U-shaped area of ​​the avoidance frame is greater than half of the horizontal length of the compaction plate. A deflection motor connected to the rotating shaft in a one-to-one correspondence is fixedly arranged on the movable plate. The deflection motor controls the direction of the U-shaped opening on the avoidance frame to avoid the movement process of the corresponding compaction plate.

5. The tensile testing device for graphene film production according to claim 1, characterized in that: The locking part includes a locking column. Two locking columns distributed front and back and with vertical axes are fixedly provided on the end surface of the longitudinal section of the lifting frame facing the implementation bar through a horizontal frame. The locking columns correspond to adjacent implementation bars. The implementation bar is rotated toward the end surface of the corresponding locking column and is provided with a matching block. A locking groove is provided on the matching block, and a spiral spring is fixed between the matching block and the implementation bar.

6. A tensile testing device for graphene film production 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 back is passed through the movable plate and slides back and forth. The smoothing plate is fixedly arranged on one end of the sliding rod close to the implementation bar. A tightening spring mounted on the sliding rod is fixedly arranged between the smoothing plate and the movable plate. The opposite surfaces of the two adjacent smoothing plates in the front and rear are rotatably provided with multiple smoothing rollers arranged equidistantly from top to bottom and with axes extending from left to right.

7. A tensile testing device for graphene film production according to claim 6, characterized in that: The end surface of the sliding rod away from the implementation bar is fixed with two horizontal rods distributed up and down and with axes extending from left to right through a rectangular block. Two front-to-back symmetrical V-shaped plates are fixed 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.

8. A tensile testing method for graphene film manufacturing, accomplished by using a tensile testing device for graphene film manufacturing according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Installing the graphene film: Manually install the graphene film roll that needs to be tensile tested on the mounting seat, and make the lower end of the graphene film pass through the two film pressing parts from top to bottom, and make the graphene film be located between the two compacting plates in the same film pressing part; S2. Compressing the graphene film: The implementing bars on the front and rear sides press against the corresponding compacting plates, so that the two compacting plates in the film pressing part compress the graphene film, and at the same time, the two smoothing plates in the smoothing part close together 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 tensile force to the graphene film until the graphene film is broken. The applied tensile force and the corresponding deformation are recorded, and the initial tensile test is completed; S5, reinstalling the graphene film: the upper film pressing part continues to move downward, driving one end of the graphene film to be tested to move downward continuously, 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. 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. The smoothing plate re-enters the smoothing state, and the reinstallation action is completed. 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. Data collection: After repeated tensile tests, multiple sets of applied tensile forces and corresponding deformations are obtained, and the actual mechanical properties of the graphene membrane are evaluated based on the obtained data.

Images