A graphene product mechanical property testing device and method

Abstract

The present invention discloses a graphene product mechanical property testing device and method thereof, and relates to the technical field of graphene product testing. The testing device includes a testing platform, a clamping mechanism, and a flattening mechanism. The testing platform is provided with a driving mechanism for driving automatic loading and a stretching mechanism for performing mechanical property testing, and the driving mechanism is provided with a clamping mechanism, and the clamping mechanism is provided with a flattening mechanism. The device provided by the present invention facilitates accurate testing and loading of graphene films, prevents manual operation of the graphene film to be tested from causing excessive movement when manually clamping the graphene film to be tested, thereby reducing the time of manual contact with the graphene film to be tested and preventing the sample from being contaminated. The graphene film to be tested is fully flattened by cooperating with a central clamping plate, a flattening assembly, and a rolling assembly, ensuring that the sample surface is as flat as possible and avoiding wrinkles or ripples that affect the measurement results.

Description

Technical Field

[0001] The present invention relates to the technical field of graphene product detection, and in particular to a graphene product mechanical property detection device. Background Art

[0002] Graphene has the characteristics of high strength, strong conductivity, high thermal conductivity and good flexibility, so it is used in a variety of products. Common graphene products include: graphene batteries, graphene films, graphene sensors and graphene heat dissipation materials, among which 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. In order to ensure the reliability and performance of graphene film in practical applications, a tensile testing machine is usually used to test the mechanical properties of graphene film.

[0003] When using current tensile testing machines for testing, it is usually necessary to manually hold the prepared graphene film sample and carefully install it into the clamp of the tensile testing machine, and then directly perform the tensile test after the clamp is clamped; however, in order to facilitate and quickly clamp and adjust, the operating space reserved in advance between the clamps is small, which makes it difficult to manually install the graphene film to be tested, and the graphene film to be tested is prone to contamination, distortion and cracking during installation; secondly, since the thickness of the graphene film to be tested is very thin, the surface flatness of the graphene film to be tested cannot be guaranteed if the test is performed directly after the clamp is clamped, and the occurrence of wrinkles or ripples may affect the measurement results; thirdly, the existing tensile testing machine moves unilaterally during testing, and unidirectional stretching may cause local stress concentration, and the accuracy of the test results needs to be improved.

[0004] Therefore, in order to improve the efficiency of sample installation and improve the accuracy of test results, the present invention provides a graphene product mechanical properties testing device. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art and to propose a graphene product mechanical properties testing device.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a graphene product mechanical properties testing device, including a testing platform, a clamping mechanism and a flattening mechanism, the testing platform is provided with a driving mechanism for driving automatic loading and a stretching mechanism for performing mechanical properties testing, and the driving mechanism is provided with a clamping mechanism, and the clamping mechanism is provided with a flattening mechanism.

[0007] The clamping mechanism includes a middle clamping component arranged on the driving mechanism for clamping the middle part of the graphene film to be detected over a large range, and an end clamping component arranged on the middle clamping component for clamping the left and right ends of the graphene film to be detected; the flattening mechanism includes a flattening component arranged on the driving mechanism and the middle clamping component for flattening the graphene film to be detected, and a rolling component arranged on the flattening component for smoothing the graphene film to be detected from the middle to the surrounding areas.

[0008] Through the three-section combination structure of the middle clamping component and the two end clamping components, the flattening mechanism is cooperated to flatten the graphene film to be tested to prevent wrinkles or ripples from affecting the measurement results. The two end clamping components are combined with the stretching mechanism to clamp and test the graphene film to be tested during transfer.

[0009] As a preferred technical solution of the present invention, the driving mechanism includes two support frames fixedly connected to the top wall of the detection platform symmetrically on the left and right sides, and the side walls of the two support frames close to each other are symmetrically provided with a front-to-back facing slide rail 1, and the two corresponding slide rails 1 on the left and right are connected to the front and rear sliding frames through an electric slider for sliding back and forth, and the front and rear sliding frames are provided with a front-to-back symmetrically arranged slide rail 2 facing up and down.

[0010] As a preferred technical solution of the present invention, the middle clamping assembly includes upper and lower sliding frames, and the slide rail 2 is connected to the U-shaped upper and lower sliding frames by an electric slider for sliding up and down. The side walls of the two upper and lower sliding frames corresponding to the front and rear are connected to the middle clamping plate by spring 1 for sliding up and down. The left and right sides of the middle clamping plate are provided with front-to-back facing slide rails 3, and the top wall of the lower middle clamping plate is connected to the positioning bar by spring 2 for sliding up and down symmetrically.

[0011] As a preferred technical solution of the present invention, the end clamping assembly includes end clamping plates arranged on the left and right sides of the middle clamping plate, and the side walls of the end clamping plates close to the middle clamping plate are connected to the upper and lower adjustment strips by spring three for sliding up and down. The upper and lower adjustment strips are connected to the corresponding slide rails three for sliding back and forth. Positioning holes are provided on the sides of the two corresponding upper and lower adjustment strips close to each other, and positioning columns corresponding to the positioning holes are fixedly connected to the end clamping plates.

[0012] As a preferred technical solution of the present invention, the end clamping plates are each connected to a plurality of clamping members for sliding up and down movement via a spring four, and each of the upper and lower corresponding clamping members is fixedly connected to at least one protrusion on a side close to each other, the protrusions on the upper and lower corresponding clamping members are staggered, and a wedge is fixedly connected to a side of the clamping member where no protrusion is provided, the end clamping plate is fixedly connected to a U-shaped member on a side away from the middle clamping plate, and the front of the support frame is fixedly connected to a horizontal plate arranged between the upper and lower corresponding U-shaped members.

[0013] As a preferred technical solution of the present invention, the flattening assembly includes a hydraulic rod, and the hydraulic rods are installed on the sides of the two corresponding front and rear sliding frames that are close to each other through a U-shaped frame. The output end of the hydraulic rod is installed with a spring rod 1, and the telescopic end of the spring rod 1 is fixedly connected to a square pressing plate. The four corners of the square pressing plate are connected to a pressing strip by a spring 5 that slides up and down, and the top wall of the pressing strip is provided with a slide rail 4.

[0014] As a preferred technical solution of the present invention, the rolling assembly includes a connecting rod, and the fixed end side wall of the spring rod one is hinged with four connecting rods along the circumferential direction, the connecting rods and the clamping strips are staggered, the end of the connecting rod away from the spring rod one is hinged with the clamping roller one, and the side walls of the two adjacent connecting rods close to each other are rotatably connected to the rotating seat, and the two adjacent rotating seats are hinged with a double-headed telescopic rod.

[0015] As a preferred technical solution of the present invention, a circular ring is rotatably sleeved on the outer wall of the fixed part of the double-headed telescopic rod, and a spring rod 2 is installed on the side wall of the circular ring. The telescopic end of the spring rod 2 away from the circular ring is hinged with a clamping roller 2, and the clamping roller 2 is slidably connected to the inside of the slide rail 4.

[0016] As a preferred technical solution of the present invention, the stretching mechanism includes a stretching frame, the top wall of the inspection table is provided with a left-right oriented slide rail five, and the slide rail five is symmetrically slidably connected to the stretching frame via an electric slider, the front side wall of the stretching frame is provided with a slot for accommodating the end clamping assembly, and the inner wall of the slot is symmetrically fixed with a snap-fit block corresponding to the U-shaped part and a wedge block two corresponding to the wedge block one, the rear side wall of the wedge block one is inclined, and the front side wall of the wedge block two is inclined to match the wedge block one.

[0017] As a preferred technical solution of the present invention, the present invention also provides a method for testing the mechanical properties of graphene products, which is completed in conjunction with the above-mentioned graphene product mechanical properties testing equipment, and specifically includes the following steps: S1. Preparation: According to the requirements of the tensile testing machine used, cut the graphene film into strip specimens of specific sizes and calibrate the equipment.

[0018] S2. Install the sample: limit the prepared sample through the clamping mechanism.

[0019] S3. Flattening the sample: The sample is flattened and smoothed by the clamping mechanism and the flattening mechanism.

[0020] S4. Tensile test specimen: The driving mechanism drives the clamping mechanism, the flattening mechanism and the specimen to the testing position. The clamping mechanism cooperates with the stretching mechanism to clamp the left and right ends of the specimen. The stretching mechanism maintains a constant stretching rate to perform a tensile test on the specimen until the specimen breaks.

[0021] S5. Data analysis: Calculate the stress-strain curve based on the recorded data, and extract key mechanical parameters from the stress-strain curve.

[0022] Compared with the existing technology, the advantages of the present invention are: 1. By coordinating the middle clamping assembly and the end clamping assembly, the accurate detection and loading of the graphene film is facilitated, and the distortion and cracking of the graphene film to be detected caused by excessive movement when manually clamping the graphene film to be detected is prevented. At the same time, the time of manual contact with the graphene film to be detected is also reduced, and the sample is prevented from being contaminated; the front and back sides of the graphene film to be detected are limited by the positioning strips, the middle clamping plate limits the middle of the graphene film to be detected, and the end clamping plates limit the left and right ends of the graphene film to be detected.

[0023] 2. The graphene film to be tested is fully flattened by cooperating with the middle clamping plate, the flattening assembly and the rolling assembly to ensure that the surface of the sample is as flat as possible to avoid wrinkles or ripples affecting the measurement results; the square pressing plate and the pressing strip flatten the middle of the graphene film to be tested, and multiple pressing rollers 1 and multiple pressing rollers 2 cooperate to synchronously press the middle clamping plate from the middle to the surrounding areas.

[0024] 3. Through the combination of the clamping mechanism and the stretching mechanism, the left and right ends of the graphene film to be tested are properly clamped without being too tight to avoid damaging the graphene film. The stretching mechanism stretches from two directions at the same time to prevent local stress concentration caused by unidirectional stretching; the upper and lower corresponding clamping parts have protrusions that clamp the left and right ends of the graphene film to be tested. The protrusions are staggered to increase the contact area with the graphene film. The surfaces of the protrusions and the end clamping plates that are in contact with the graphene film to be tested are provided with gaskets to disperse the applied pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0026] Figure 1 A schematic diagram of the overall structure.

[0027] Figure 2 This is a structural diagram of the stretching mechanism before stretching.

[0028] Figure 3 This is a structural diagram of the stretching mechanism during stretching.

[0029] Figure 4 It is a partial structural diagram of the driving mechanism, clamping mechanism and flattening mechanism.

[0030] Figure 5 It is a partial structural diagram of the middle clamping assembly and the end clamping assembly.

[0031] Figure 6 It is a partial structural cross-sectional diagram of the end clamping assembly.

[0032] Figure 7 It is a structural diagram of the leveling mechanism.

[0033] Figure 8 Schematic diagram of the changes of the rolling component before and after rolling.

[0034] Figure 9 It is a partial structural diagram of the stretching mechanism and the end clamping assembly.

[0035] Figure 10 Schematic diagram of the cross-sectional structure of the stretching frame.

[0036] Figure 11 for Figure 8 Schematic diagram of the enlarged structure at point A in the middle.

[0037] In the figure: 1. Testing table; 2. Driving mechanism; 21. Support frame; 22. Front and rear sliding frames; 3. Clamping mechanism; 31. Middle clamping assembly; 311. Upper and lower sliding frames; 312. Middle clamping plate; 313. Positioning bar; 32. End clamping assembly; 321. End clamping plate; 322. Upper and lower adjustment bars; 323. Positioning column; 324. Clamping piece; 325. Wedge block 1; 326. U-shaped piece; 4. Leveling mechanism; 41. Flattening assembly; 411. Hydraulic rod; 412. Spring rod 1; 413. Square clamping plate; 414. Clamping bar; 42. Rolling assembly; 421. Connecting rod; 422. Clamping roller 1; 423. Double-head telescopic rod; 424. Spring rod 2; 425. Clamping roller 2; 5. Stretching mechanism; 51. Stretching frame; 52. Engaging block; 53. Wedge block 2. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Reference Figures 1 to 3 A graphene product mechanical properties testing equipment includes a testing platform 1, a clamping mechanism 3 and a leveling mechanism 4. The testing platform 1 is provided with a driving mechanism 2 for driving automatic loading and a stretching mechanism 5 for performing mechanical properties testing. The driving mechanism 2 is provided with a clamping mechanism 3, and the clamping mechanism 3 is provided with a leveling mechanism 4.

[0040] Before testing, the graphene film to be tested is first clamped by the clamping mechanism 3, and then pressure is applied to the clamping mechanism 3 by the flattening mechanism 4 to smooth the graphene film to be tested. The clamping mechanism 3 and the flattening mechanism 4 are driven to move by the driving mechanism 2, and the clamping mechanism 3 cooperates with the stretching mechanism 5 to automatically test and load the film. During testing, the graphene film is stretched simultaneously in two directions by the stretching mechanism 5 to test the mechanical properties of the graphene film. This equipment realizes automatic and continuous operation of loading, flattening, clamping and stretching testing through the combination and cooperation of various mechanisms.

[0041] Reference Figure 1 and Figure 4 The driving mechanism 2 includes two support frames 21 symmetrically fixedly connected to the top wall of the detection platform 1. The side walls of the two support frames 21 close to each other are symmetrically provided with front-to-back facing slide rails 1. The two corresponding slide rails 1 on the left and right are connected to the front and rear sliding frames 22 for sliding back and forth through an electric slider. The front and rear sliding frames 22 are provided with front-to-back symmetrically arranged slide rails 2 facing up and down.

[0042] Reference Figure 1 and Figure 4 The clamping mechanism 3 includes a middle clamping component 31 arranged on the driving mechanism 2 for clamping the middle part of the graphene film to be detected in a large range, and an end clamping component 32 arranged on the middle clamping component 31 for clamping the left and right ends of the graphene film to be detected.

[0043] Reference Figures 4 and 5 The middle clamping assembly 31 includes an upper and lower sliding frame 311. The upper and lower sliding frames 311 are connected to the U-shaped upper and lower sliding frames 311 on the slide rail 2 through an electric slider for sliding up and down. The side walls of the two upper and lower sliding frames 311 corresponding to the front and rear are connected to the middle clamping plate 312 for sliding up and down through spring 1 (not shown in the figure). The left and right sides of the middle clamping plate 312 are provided with front-to-back facing sliding rails 3. The top wall of the lower middle clamping plate 312 is connected to the positioning bar 313 for sliding up and down symmetrically through spring 2 (not shown in the figure).

[0044] Reference Figures 4 to 6The end clamping assembly 32 includes end clamping plates 321 arranged on the left and right sides of the middle clamping plate 312. The end clamping plates 321 are connected to the side walls of the middle clamping plate 312 by sliding up and down through springs three (not shown in the figure). The upper and lower adjustment bars 322 are connected to the corresponding slide rails three for sliding forward and backward. The two upper and lower adjustment bars 322 corresponding to each other are each provided with a positioning hole on one side. The end clamping plate 321 is fixedly connected to a positioning column 323 corresponding to the positioning hole. The holding plate 321 is connected to a plurality of clamping members 324 for sliding up and down movement by spring four. The upper and lower corresponding clamping members 324 are fixedly connected to at least one protrusion on the side close to each other. The protrusions on the upper and lower corresponding clamping members 324 are staggered. The side of the clamping member 324 without a protrusion is fixedly connected to a wedge 325. The end clamping plate 321 is fixedly connected to a U-shaped member 326 on the side away from the middle clamping plate 312. The front part of the support frame 21 is fixedly connected to a horizontal plate arranged between the upper and lower corresponding U-shaped members 326.

[0045] The initial state of the two middle clamping plates 312 is to be away from each other. The graphene film to be detected is manually and gently placed on the top wall of the middle clamping plate 312 on the lower side. The front and rear sides of the graphene film to be detected are limited by the positioning strips 313. The upper and lower sliding frames 311 are driven by the electric slider to slide on the corresponding front and rear sliding frames 22, driving the two middle clamping plates 312 opposite to each other to move closer. The two middle clamping plates 312 opposite to each other gradually limit the middle of the graphene film to be detected in the upper and lower directions. The positioning strips 313 is pushed by the middle clamping plate 312 on the upper side and adaptively slides into the interior of the middle clamping plate 312 on the lower side. At the same time, the two end clamping plates 321 opposite to each other limit the left and right ends of the graphene film to be tested in the upper and lower directions to facilitate accurate detection and loading of the graphene film, and prevent the graphene film to be tested from being twisted and broken due to excessive movements when manually clamping the graphene film to be tested. At the same time, it also reduces the time of manual contact with the graphene film to be tested and prevents the sample from being contaminated.

[0046] Reference Figure 4 and Figure 7 The flattening mechanism 4 includes a flattening component 41 arranged on the driving mechanism 2 and the middle clamping component 31 for flattening the graphene film to be detected, and a rolling component 42 arranged on the flattening component 41 for smoothing the graphene film to be detected from the middle to the surrounding areas.

[0047] Reference Figure 4 、 Figures 7 and 8The flattening assembly 41 includes a hydraulic rod 411. The hydraulic rod 411 is installed on the side of the two corresponding front and rear sliding frames 22 through a U-shaped frame. The output end of the hydraulic rod 411 is installed with a spring rod 412. The telescopic end of the spring rod 412 is fixedly connected to a square clamping plate 413. The four corners of the square clamping plate 413 are connected to a clamping strip 414 for sliding up and down through a spring five (not shown in the figure). The top wall of the clamping strip 414 is provided with a slide rail four.

[0048] Reference Figure 7 、 Figure 8 and Figure 11 The rolling assembly 42 includes a connecting rod 421, and four connecting rods 421 are hinged on the side wall of the fixed end of the spring rod 1 412 along the circumferential direction. The connecting rods 421 are staggered with the pressing strips 414, and the end of the connecting rod 421 away from the spring rod 1 412 is hinged with a pressing roller 1 422. The side walls of the two adjacent connecting rods 421 close to each other are rotatably connected to a rotating seat, and a double-headed telescopic rod 423 is hinged on the two adjacent rotating seats; the outer wall of the fixed part of the double-headed telescopic rod 423 is rotatably sleeved with a circular ring, and the side wall of the circular ring is installed with a spring rod 2 424, and the telescopic end of the spring rod 2 424 away from the circular ring is hinged with a pressing roller 2 425, and the pressing roller 2 425 is slidably connected to the inside of the slide rail 4.

[0049] The bottom wall of the output end of the hydraulic rod 411 moves downward, driving the spring rod 1 412, the square pressure plate 413, the pressure strip 414, and the roller assembly 42 to move downward as a whole. When the square pressure plate 413 and the pressure strip 414 move downward until they are in close contact with the side wall of the middle clamping plate 312, the square pressure plate 413 and the pressure strip 414 apply pressure to the middle clamping plate 312, thereby flattening the middle part of the graphene film to be tested. The bottom wall of the output end of the hydraulic rod 411 continues to move downward, and the telescopic end of the spring rod 1 412 contracts into the fixed end of the spring rod 1 412 to adapt to the changes of the hydraulic rod 411. It should be noted that because the pressure strips 414 are distributed at the four corners of the square pressure plate 413, and the upper and lower sides of the graphene film to be tested are supported by the middle clamping plate 312, the graphene film to be tested will not be damaged by concentrated stress.

[0050] The output end of the hydraulic rod 411 continues to move downward to drive the rolling assembly 42 to change. The initial state of the connecting rod 421 is relatively vertical and close to the spring rod 1 412. The initial state of the pressing roller 1 422 is close to the square pressing plate 413. The initial state of the double-headed telescopic rod 423 is that both ends are retracted. The specific changes of the rolling assembly 42 (such as Figure 8): The connecting rod 421 changes from relatively vertical to relatively horizontal, and the connecting rod 421 drives the clamping roller 422 to roll on the top wall of the middle clamping plate 312 until it is away from the square clamping plate 413. The two ends of the double-headed telescopic rod 423 extend to adapt to the changes of the connecting rod 421. The double-headed telescopic rod 423 is conducive to enhancing the stability of the connecting rod 421 when it changes. Multiple clamping rollers 422 roll the middle clamping plate 312 synchronously from the middle to the surrounding areas.

[0051] The double-headed telescopic rod 423 drives the second pressing roller 425 to slide on the slide rail four of the pressing strip 414 through the second spring rod 424. The circular ring rotates and the second spring rod 424 contracts to adapt to the changes of the double-headed telescopic rod 423. Multiple second pressing rollers 425 synchronously roll the pressing strip 414 from the middle to the surrounding areas. The pressing strip 414 is forced to slide toward the middle clamping plate 312 to press the middle clamping plate 312. The pressing strip 414 and the first pressing roller 422 are staggered and cooperate with each other to fully level the graphene film to be tested, ensuring that the surface of the sample is as flat as possible to avoid wrinkles or ripples affecting the measurement results.

[0052] Reference Figure 1 、 Figure 9 and Figure 10 The stretching mechanism 5 includes a stretching frame 51. The top wall of the inspection platform 1 is provided with a left-right oriented slide rail 5, and the stretching frame 51 is symmetrically slidably connected to the slide rail 5 through an electric slider. The front side wall of the stretching frame 51 is provided with a slot for accommodating the end clamping assembly 32. The inner wall of the slot is symmetrically fixed with a snap-fit block 52 corresponding to the U-shaped piece 326 and a wedge block 2 53 corresponding to the wedge block 1 325. The rear side wall of the wedge block 1 325 is inclined, and the front side wall of the wedge block 2 53 is inclined to match the wedge block 1 325.

[0053] Reference Figures 6 to 8 During the leveling operation, the horizontal plate restricts the upper and lower relative U-shaped parts 326 and the upper and lower relative end clamping plates 321 from moving closer to each other. Therefore, during the leveling process, the height of the end clamping plates 321 remains unchanged, and the middle clamping plate 312 slides up and down a small distance relative to the upper and lower sliding frames 311 to adapt to the rolling of the clamping roller 422 and the clamping strip 414. When the leveling operation is completed, the middle clamping plate 312 moves down to drive the upper and lower adjustment strips 322 to slide to engage with the positioning column 323. When the clamping roller 422 and the clamping strip 414 remain stationary, the positions of the middle clamping plate 312 and the end clamping plate 321 remain relatively fixed.

[0054] The front and rear sliding frames 22 are driven by the electric slider to slide backward, and the clamping mechanism 3 and the leveling mechanism 4 move backward as a whole. When approaching the stretching frame 51, the wedge block 1 325 gradually approaches the corresponding wedge block 2 53 until the inclined surface of the wedge block 1 325 is in contact with the inclined surface of the wedge block 2 53, and the wedge block 2 53 pushes the wedge block 1 325 and the clamping member 324 to move toward the corresponding end clamping plate 321, and the upper and lower corresponding clamping members 324 move close to each other until the protrusions of the upper and lower corresponding clamping members 324 clamp the left and right ends of the graphene film to be detected. The protrusions are staggered to increase the contact area with the graphene film, and the surfaces of the protrusions and the end clamping plate 321 that contact the graphene film to be detected are provided with gaskets, so as to disperse the applied pressure and prevent stress concentration.

[0055] When the upper and lower ends of the cam 324 are in the engagement with each other, the upper and lower ends of the cam 324 are in the engagement with each other, and the upper and lower ends of the cam 324 are in the engagement with each other, so that the cam 324 can be pulled back and the cam 324 is released. Figure 9 ).

[0056] The two stretching frames 51 are driven by an electric slider to slide simultaneously in opposite directions, driving the U-shaped member 326 and the end clamping plate 321 as well as the two ends of the clamped graphene film to be tested to be stretched in the left and right directions at the same time. The actual applied force during the clamping process is monitored by a force sensor (this is a prior art and will not be described in detail here) to realize the detection of the entire stretching process until the graphene film breaks and the experiment is completed.

[0057] The present invention also provides a method for testing the mechanical properties of graphene products using the above-mentioned graphene product mechanical properties testing equipment. The specific testing method includes the following steps: S1. Preparation: According to the requirements of the tensile testing machine used, the graphene film is cut into strip samples of specific sizes and the equipment is calibrated.

[0058] S2. Install the sample: limit the prepared sample through the clamping mechanism 3.

[0059] S3. Flattening the sample: The clamping mechanism 3 and the flattening mechanism 4 cooperate to flatten and smooth the sample.

[0060] S4. Stretch the specimen: The driving mechanism 2 drives the clamping mechanism 3, the flattening mechanism 4, and the specimen to the testing position. The clamping mechanism 3 cooperates with the stretching mechanism 5 to clamp the left and right ends of the specimen. The stretching mechanism 5 maintains a constant stretching rate to perform a stretching test on the specimen until the specimen breaks.

[0061] S5. Data analysis: Calculate the stress-strain curve based on the recorded data, and extract key mechanical parameters from the stress-strain curve.

[0062] It should be noted that the data analysis method used in this application is an existing mature technology.

[0063] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A graphene product mechanical properties testing device, comprising a testing platform, a clamping mechanism and a flattening mechanism, characterized in that: The testing table is provided with a driving mechanism for driving automatic feeding and a stretching mechanism for performing mechanical property testing, and the driving mechanism is provided with a clamping mechanism, and the clamping mechanism is provided with a flattening mechanism; The clamping mechanism includes a middle clamping assembly provided on the driving mechanism for clamping the middle of the graphene film to be detected in a large range, and an end clamping assembly provided on the middle clamping assembly for clamping the left and right ends of the graphene film to be detected; The flattening mechanism includes a flattening component provided on the driving mechanism and the middle clamping component for flattening the graphene film to be detected, and a rolling component provided on the flattening component for smoothing the graphene film to be detected from the middle to the surrounding areas; Through the three-section combination structure of the middle clamping component and the two end clamping components, the flattening mechanism is cooperated with the graphene film to be tested to prevent wrinkles or ripples from affecting the measurement results. The two end clamping components are combined with the stretching mechanism to clamp and test the graphene film to be tested during transfer.

2. A graphene product mechanical properties testing device according to claim 1, characterized in that: The driving mechanism includes two support frames fixedly connected to the top wall of the detection platform symmetrically on the left and right sides. The side walls of the two support frames close to each other are symmetrically provided with slide rails facing forward and backward, and the two corresponding slide rails on the left and right are connected to the front and rear sliding frames through electric sliders for sliding forward and backward. The front and rear sliding frames are provided with slide rails 2 that are symmetrically arranged front and back and facing upward and downward.

3. The graphene product mechanical properties testing equipment according to claim 1, characterized in that: The middle clamping assembly includes an upper and lower sliding frame, and the slide rail 2 is connected to the U-shaped upper and lower sliding frame by an electric slider for sliding up and down. The side walls of the two upper and lower sliding frames corresponding to the front and rear are connected to the middle clamping plate by spring 1 for sliding up and down. The left and right sides of the middle clamping plate are both provided with front-to-back facing slide rails 3, and the top wall of the lower middle clamping plate is connected to the positioning bar by spring 2 for sliding up and down symmetrically.

4. A graphene product mechanical properties testing device according to claim 3, characterized in that: The end clamping assembly includes end clamping plates arranged on the left and right sides of the middle clamping plate, and the side walls of the end clamping plates close to the middle clamping plate are connected to the upper and lower adjustment strips for sliding up and down through spring three, and the upper and lower adjustment strips are connected to the corresponding slide rails three for sliding forward and backward. Positioning holes are provided on the sides of the two corresponding upper and lower adjustment strips close to each other, and positioning columns corresponding to the positioning holes are fixedly connected to the end clamping plates.

5. The graphene product mechanical properties testing equipment according to claim 4, characterized in that: The end clamping plates are connected to multiple clamping parts for sliding up and down through spring four, and the upper and lower corresponding clamping parts are fixedly connected to at least one protrusion on the side close to each other, the protrusions on the upper and lower corresponding clamping parts are staggered, and the side of the clamping part without a protrusion is fixedly connected to a wedge block one, the end clamping plate is fixedly connected to the side away from the middle clamping plate, and the front of the support frame is fixedly connected to a horizontal plate arranged between the upper and lower corresponding U-shaped parts.

6. The graphene product mechanical properties testing equipment according to claim 2, characterized in that: The flattening assembly includes a hydraulic rod, and the hydraulic rod is installed on the side of the two corresponding front and rear sliding frames that are close to each other through a U-shaped frame. The output end of the hydraulic rod is installed with a spring rod 1, and the telescopic end of the spring rod 1 is fixedly connected to a square pressing plate. The four corners of the square pressing plate are connected to the pressing strip by spring 5 for sliding up and down, and the top wall of the pressing strip is provided with a slide rail 4.

7. The graphene product mechanical properties testing device according to claim 6, characterized in that: The rolling assembly includes a connecting rod, and the fixed end side wall of the spring rod 1 is hinged with four connecting rods along the circumferential direction. The connecting rods and the clamping strips are staggered. The end of the connecting rod away from the spring rod 1 is hinged with the clamping roller 1, and the side walls of the two adjacent connecting rods close to each other are rotatably connected to the rotating seat, and the two adjacent rotating seats are hinged with a double-headed telescopic rod.

8. The graphene product mechanical properties testing device according to claim 7, characterized in that: The outer wall of the fixed part of the double-head telescopic rod is rotatably sleeved with a circular ring, and the side wall of the circular ring is installed with a spring rod 2, the telescopic end of the spring rod 2 away from the circular ring is hinged with a clamping roller 2, and the clamping roller 2 is slidably connected to the inside of the slide rail 4.

9. The graphene product mechanical properties testing device according to claim 5, characterized in that: The stretching mechanism includes a stretching frame, a left-right oriented slide rail five is provided on the top wall of the inspection table, and the stretching frame is symmetrically slidably connected to the slide rail five via an electric slider, a slot for accommodating an end clamping assembly is provided on the front side wall of the stretching frame, and a snap-fit block corresponding to the U-shaped piece and a wedge block two corresponding to the wedge block one are fixedly connected symmetrically up and down on the inner wall of the slot, the rear side wall of the wedge block one is inclined, and the front side wall of the wedge block two is inclined to match the wedge block one.

10. A method for testing the mechanical properties of graphene products, using the graphene product mechanical properties testing equipment according to claim 1, characterized in that: The following steps are involved: S1. Preparation: Cut the graphene film into strip specimens of specific size according to the requirements of the tensile testing machine used, and calibrate the equipment; S2. Install the sample: limit the prepared sample through the clamping mechanism; S3. Flattening the sample: The sample is flattened and smoothed by the clamping mechanism and the flattening mechanism; S4. Tensile test specimen: The driving mechanism drives the clamping mechanism, the flattening mechanism, and the specimen to the testing position. The clamping mechanism cooperates with the stretching mechanism to clamp the left and right ends of the specimen. The stretching mechanism maintains a constant stretching rate to perform a tensile test on the specimen until the specimen breaks. S5. Data analysis: Calculate the stress-strain curve based on the recorded data, and extract key mechanical parameters from the stress-strain curve.

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