A diaphragm mechanical properties testing device

Abstract

The present invention relates to the technical field of diaphragm performance testing devices, and specifically to a diaphragm mechanical properties testing device, comprising a base and a top seat, wherein the base and the top seat are fixedly connected, and a puncture mechanism is provided on the top seat for performing a puncture test on the diaphragm; and a sample loading mechanism is provided on the base. The present invention provides a sample loading mechanism, a puncture mechanism, a stretching mechanism, and an air pressure distribution mechanism, so that when performing a mechanical properties test on the diaphragm, a choice can be made between a stretching test, a puncture test, and a simultaneous puncture and stretching test, and the conditions of each test can be controlled, so as to provide more and more practical test data for the mechanical testing of the diaphragm, thereby providing more comprehensive and effective test data for evaluating the mechanical properties of the diaphragm. At the same time, the sample loading mechanism effectively simplifies the disassembly and clamping steps of the diaphragm sample, avoiding the time-consuming and labor-intensive problems of loading and sampling the diaphragm sample.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm performance detection devices, and specifically to a diaphragm mechanical property detection device. Background Technique

[0002] In the structure of a lithium battery, the diaphragm is one of the key inner components. The main function of the diaphragm is to separate the positive and negative electrodes of the battery to prevent the two electrodes from contacting and short - circuiting. In addition, the diaphragm also has the function of allowing electrolyte ions to pass through.

[0003] In the performance test of existing lithium - battery diaphragms, in terms of mechanical properties, mainly the diaphragm tensile strength test and the diaphragm puncture strength test are carried out. Through mechanical property detection, the physical strength of the diaphragm can be evaluated to ensure that it can maintain stable performance in a complex physical environment and prevent battery short - circuit or other safety problems caused by diaphragm breakage.

[0004] However, when detecting the mechanical properties of existing diaphragms, the puncture test and the tensile test are currently mostly carried out independently, and the compatibility of the equipment is poor. At the same time, during the detection, multiple repeated tests are required to reduce errors. During each test, the specimen needs to be manually replaced or the position of the specimen needs to be moved, and the disassembly and clamping steps of the specimen are time - consuming and laborious.

[0005] In view of this, we propose a diaphragm mechanical property detection device. Summary of the Invention

[0006] The purpose of the present invention is to provide a diaphragm mechanical property detection device, which solves the problems raised in the above - mentioned background technique.

[0007] To achieve the above - mentioned purpose, the present invention provides the following technical solutions:

[0008] A diaphragm mechanical property detection device includes a base and a top seat, which are fixedly connected between the base and the top seat. A puncture mechanism is arranged on the top seat for performing a puncture test on the diaphragm;

[0009] A sample loading mechanism is arranged on the base for loading and unloading the diaphragm;

[0010] A stretching mechanism is also arranged on the base for performing a stretching test on the diaphragm. The stretching mechanism has two or four and is symmetrically arranged along the center of the base;

[0011] An air pressure distribution mechanism is arranged between the sample loading mechanism, the puncture mechanism, and the stretching mechanism for controlling air flow.

[0012] Preferably, the stretching mechanism includes a stretching groove opened at the top end of the base. A working plate is slidably installed in the stretching groove. A cylinder is fixedly connected to the working plate. Negative pressure holes are opened in the working plate. A one-way valve is fixedly installed on the working plate.

[0013] Preferably, sliding grooves are opened on the base. A movable seat is slidably installed in the sliding grooves. A pressing plate is installed in the movable seat through a spring. The sliding grooves communicate with the stretching groove. A fixed connection is provided between the movable seat and the working plate.

[0014] Preferably, guide grooves are also opened on the base. The guide grooves are formed by connecting an arc-shaped groove and a straight groove. A guide rod is fixedly installed on the pressing plate. The guide rod is adapted to the guide grooves.

[0015] Preferably, the sample loading mechanism includes an inner cavity opened at the center position of the top end of the base. Sliding rods are fixedly installed at the four corner positions of the base where the inner cavity is located. Movable frames are slidably installed on the sliding rods. A plurality of sample loading rollers are rotatably installed at the bottom ends of the movable frames.

[0016] Preferably, a pressing airbag is fixedly installed between the movable frame and the top end of the sliding rod. A supporting airbag is fixedly installed between the movable frame and the base.

[0017] Preferably, the puncturing mechanism includes an air storage cylinder fixedly connected to the top seat. A syringe barrel is fixedly connected to the bottom end of the air storage cylinder. A piston is slidably installed in the syringe barrel. A detection probe is fixedly installed at the bottom end of the piston. An electromagnetic valve is fixedly installed between the air storage cylinder and the syringe barrel.

[0018] Preferably, the air pressure distribution mechanism includes an air pump. The working plate is connected to the air inlet of the air pump. The air outlet of the air pump is fixedly connected to a selection valve I. The selection valve I is fixedly connected to the pressing airbag and the supporting airbag respectively through pipelines. The pressing airbag is fixedly connected to a selection valve II through a pipeline. The selection valve II is connected to the puncturing mechanism through a pipeline.

[0019] Preferably, the supporting airbag is fixedly connected to a selection valve III through a pipeline. The selection valve III is connected to the cylinder through a pipeline.

[0020] Preferably, a communication is provided between the selection valve I and the selection valve II through a pipeline, and a valve is provided on the pipeline between the pressing airbag and the selection valve II.

[0021] By means of the above technical solutions, the present invention provides a diaphragm mechanical property detection device, which at least has the following beneficial effects:

[0022] (1) By providing a sample loading mechanism, a puncture mechanism, a stretching mechanism, and a pneumatic distribution mechanism, the present invention enables the selection between tensile tests, puncture tests, and simultaneous puncture and tensile tests during the mechanical property test of the diaphragm, and can control the conditions of each test, providing more and more practically meaningful test data for the mechanical detection of the diaphragm, thereby providing more comprehensive and effective test data for evaluating the mechanical properties of the diaphragm. At the same time, the sample loading mechanism effectively simplifies the disassembly and clamping steps of the diaphragm sample, avoiding the time-consuming and laborious problems of sample loading and sampling of the diaphragm sample.

[0023] (2) By providing a sample loading mechanism, a puncture mechanism, an air pump, a selection valve 1, and a selection valve 2, the present invention enables the selection between standard puncture tests and high-speed puncture tests during the puncture test of the diaphragm, thereby enabling the detection of the puncture performance of the diaphragm under conventional conditions and more extreme conditions. At the same time, when performing the puncture test on the diaphragm, the diaphragm will be automatically clamped by the downward movement of the movable frame, improving the efficiency and stability of the detection.

[0024] (3) By providing a sample loading mechanism, a stretching mechanism, an air pump, a selection valve 1, and a selection valve 3, the present invention enables the selection between unilateral stretching, unidirectional stretching, and bidirectional stretching of the diaphragm during the tensile test of the diaphragm, thereby simulating various stress states that the diaphragm may encounter in actual applications and providing more comprehensive data to evaluate the performance of the diaphragm. At the same time, when the diaphragm is subjected to a tensile test, the diaphragm is clamped and fixed by the displacement of the pressing plate automatically cooperating with the working plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application:

[0026] Figure 1 is a schematic structural diagram of the present invention;

[0027] Figure 2 is a schematic diagram of the sample loading mechanism of the present invention;

[0028] Figure 3 is of the present invention Figure 2 split structural schematic diagram;

[0029] Figure 4 is of the present invention Figure 3 partial enlarged schematic diagram;

[0030] Figure 5 is a schematic diagram of the puncture mechanism of the present invention;

[0031] Figure 6 is a schematic cross-sectional view of the puncture mechanism of the present invention;

[0032] Figure 7 Schematic diagram of the stretching mechanism of the present invention;

[0033] Figure 8 Schematic diagram of the working plate of the present invention and its connection structure;

[0034] Figure 9 Exploded view of the pressing plate and the movable seat of the present invention;

[0035] Figure 10 Schematic diagram of the guide groove and the sliding groove structure of the present invention;

[0036] Figure 11 of the present invention Figure 10 Enlarged view of area A in;

[0037] Figure 12 Schematic diagram of the cylinder and pipeline connection of the present invention;

[0038] Figure 13 Schematic diagram of the structure of Embodiment 2 of the present invention;

[0039] Figure 14 Schematic diagram of the pipeline connection of Embodiment 3 of the present invention.

[0040] In the figure: 1, base; 2, top seat; 3, sample loading mechanism; 4, puncture mechanism; 5, stretching mechanism; 6, air pump; 7, selector valve 1; 8, selector valve 2; 9, selector valve 3;

[0041] 31, inner cavity; 32, sliding rod; 33, movable frame; 34, sample loading roller; 35, pressing airbag; 36, supporting airbag;

[0042] 41, syringe; 42, air storage cylinder; 43, solenoid valve; 44, detection probe; 45, piston;

[0043] 51, stretching groove; 52, working plate; 521, negative pressure hole; 53, cylinder; 54, pressing plate; 55, sliding groove; 56, guide rod; 57, guide groove; 571, arc groove; 572, straight groove; 58, movable seat. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0045] Please refer to Figures 1-14, A diaphragm mechanical property detection device, including a base 1 and a top seat 2, which are fixedly connected between the base 1 and the top seat 2. A sample loading mechanism 3 is arranged on the base 1 for sample loading and fixing of the diaphragm, and there is no need to fix the diaphragm before the test, making the injection and extraction of the diaphragm more convenient and stable.

[0046] A puncture mechanism 4 is arranged on the top seat 2 for performing puncture tests on the diaphragm, and stable puncture tests and instantaneous puncture tests can be carried out according to requirements, and the puncture performance of the diaphragm can be detected based on the data of the puncture test.

[0047] A stretching mechanism 5 is also arranged on the base 1 for performing stretching tests on the diaphragm, and the stretching conditions can be adjusted to obtain more realistic stretching test results.

[0048] An air pressure distribution mechanism is arranged between the sample loading mechanism 3, the puncture mechanism 4, and the stretching mechanism 5 for controlling the operation of the sample loading mechanism 3, the puncture mechanism 4, and the stretching mechanism 5, thereby realizing the control of the diaphragm mechanical property detection items.

[0049] Please refer to Figures 2-4 , The sample loading mechanism 3 includes an inner cavity 31, and the inner cavity 31 is opened at the center position of the top end of the base 1, so that the base 1 will not block the puncture mechanism 4 during the puncture test of the diaphragm, making the result of the puncture test more accurate. Sliding rods 32 are fixedly installed at the positions around the four corners of the inner cavity 31 on the base 1, and a movable frame 33 is slidably installed on the sliding rods 32. The movable frame 33 is a hollow structure inside, so that the movable frame 33 will not affect the puncture test of the diaphragm. A plurality of sample loading rollers 34 are rotatably installed at the bottom end of the movable frame 33, and the plurality of sample loading rollers 34 are arranged in an array, and adjacent sample loading rollers 34 are connected by a transmission belt. By rotating one sample loading roller 34, all the sample loading rollers 34 can be driven to rotate synchronously, so that the diaphragm can be conveyed by friction for diaphragm detection injection and sample replacement after the detection.

[0050] A pressing airbag 35 is fixedly installed between the movable frame 33 and the top end of the sliding rod 32. The pressing airbag 35 is sleeved on the surface of the sliding rod 32. The pressing airbag 35 can press down the movable frame 33 when inflated, so that the movable frame 33 can fix the diaphragm during the puncture test. A supporting airbag 36 is fixedly installed between the movable frame 33 and the base 1. The supporting airbag 36 is sleeved on the surface of the sliding rod 32. When the supporting airbag 36 is inflated, it can support the movable frame 33 upward to avoid the movable frame 33 affecting the stretching test of the diaphragm.

[0051] Please refer to Figures 5-6, the puncturing mechanism 4 includes an air storage cylinder 42 which is fixedly installed at the bottom end of the top seat 2, and a syringe barrel 41 is fixedly connected to the bottom end of the air storage cylinder 42. A piston 45 is slidably installed in the syringe barrel 41, and a detection probe 44 is fixedly installed at the bottom end of the piston 45. The piston 45 can drive the detection probe 44 to slide along the inside of the syringe barrel 41, so as to facilitate the detection probe 44 to perform a puncture test on the diaphragm. An electromagnetic valve 43 is connected between the syringe barrel 41 and the air storage cylinder 42. The inner diameter of the air storage cylinder 42 is larger than that of the syringe barrel 41. When the electromagnetic valve 43 is normally open, the detection probe 44 can move down smoothly and uniformly to perform a puncture test on the diaphragm. When the electromagnetic valve 43 is closed, the air pressure accumulates in the air storage cylinder 42. When the electromagnetic valve 43 is opened, the air pressure will drive the detection probe 44 to move down quickly, so as to detect the performance of the diaphragm during instantaneous puncture. A pressure sensor is provided on the piston 45 to record during the puncture detection.

[0052] Please refer to Figures 7-11 , there are two stretching mechanisms 5, which are symmetrically arranged on both sides of the inner cavity 31. The stretching mechanism 5 includes a stretching groove 51 which is opened at the top end of the base 1. A working plate 52 is slidably installed in the stretching groove 51. The top end of the working plate 52 is flush with the top end of the base 1. There are two working plates 52 which are arranged relative to the inner cavity 31. Negative pressure holes 521 are opened at the top end of the working plate 52 for adsorbing the diaphragm during stretching to prevent the diaphragm from detaching. The working plate 52 is fixedly connected to the output shaft of the air cylinder 53, so that the air cylinder 53 can drive the working plate 52 to displace along the stretching groove 51, thereby performing a stretching test on the diaphragm.

[0053] A sliding groove 55 is opened on the base 1. A movable seat 58 is slidably installed in the sliding groove 55. The sliding groove 55 is communicated with the stretching groove 51. The movable seat 58 is fixedly connected to the working plate 52, so that the working plate 52 and the movable seat 58 can move synchronously. A pressing plate 54 is installed in the movable seat 58 through a spring. A guide rod 56 is fixedly installed on the pressing plate 54. A guide groove 57 is also opened on the base 1, and the guide rod 56 is adapted to the guide groove 57.

[0054] The guide groove 57 is composed of an arc groove 571 and a straight groove 572 connected. When the guide rod 56 displaces along the guide groove 57, it will first move down along the arc groove 571. The guide rod 56 drives the pressing plate 54 to move down, so that the pressing plate 54 and the working plate 52 can play a clamping role on the diaphragm, and the automatic clamping without manual operation is simpler and more convenient.

[0055] Please refer to Figure 12, the air pressure distribution mechanism includes an air pump 6. The air inlet of the air pump 6 is connected to the working plate 52 through a pipeline. A one-way valve is fixedly installed on the working plate 52. When the air pump 6 starts, it will cause a certain negative pressure on the working plate 52, thereby generating a certain adsorption effect on the diaphragm, strengthening the fixation of the diaphragm. The existence of the one-way valve ensures that the air intake of the air pump 6 is not affected and the negative pressure of the working plate 52 is stable.

[0056] The air outlet of the air pump 6 is connected to a first selection valve 7 through a pipeline. The first selection valve 7 is respectively connected to a pressing airbag 35 and a supporting airbag 36 through pipelines. The pressing airbag 35 is connected to a second selection valve 8 through a pipeline. The second selection valve 8 is connected to a puncture mechanism 4 through a pipeline. During the puncture test, air will first pass through the pressing airbag 35, causing the pressing airbag 35 to inflate. The pressing airbag 35 presses the movable frame 33 downward, thereby playing a role in fixing the diaphragm. There is no need for manual fixation, which is simpler and more convenient.

[0057] The supporting airbag 36 is connected to a plurality of third selection valves 9 through pipelines. The third selection valves 9 are connected to a cylinder 53 through pipelines. Before the tensile test, air will first pass through the supporting airbag 36, causing the supporting airbag 36 to inflate. The supporting airbag 36 presses the movable frame 33 upward, causing the movable frame 33 to move away from the diaphragm, avoiding the contact between the sample roller 34 at the bottom of the movable frame 33 and the diaphragm, and affecting the accuracy of the diaphragm tensile test. Embodiment

[0058] Please refer to Figure 13 , the difference between this embodiment and the first embodiment is only that there are four stretching mechanisms 5, and they are vertically arranged relative to the inner cavity 31, so that when performing a tensile test on the diaphragm, bidirectional or unidirectional stretching can be selectively realized. Compared with the first embodiment, the advantage of bidirectional tensile test can be achieved. Embodiment

[0059] Please refer to Figure 14 , the difference between this embodiment and the first embodiment is only that the first selection valve 7 and the second selection valve 8 are connected through a pipeline, and a valve is provided on the pipeline between the pressing airbag 35 and the second selection valve 8. Therefore, during the puncture test, air can directly enter the second selection valve 8 through the first selection valve 7. By closing the valve between the pressing airbag 35 and the second selection valve 8, air can reach the second selection valve 8 without passing through the pressing airbag 35. Therefore, the diaphragm tensile test and the diaphragm puncture test can be carried out synchronously, providing more comprehensive data for the mechanical property detection of the diaphragm.

[0060] When a diaphragm mechanical property detection device is in use, it is divided into the following operations:

[0061] I. Diaphragm sample placement and replacement:

[0062] Place the diaphragm flat between the working plate 52 and the sample loading roller 34. By rotating the sample loading roller 34, the diaphragm sample is driven to move smoothly, thus playing a role in laying out and removing the diaphragm.

[0063] II. Penetration test:

[0064] Start the air pump 6. Air enters the working plate 52 through the one-way valve, enabling the working plate 52 to generate a certain negative pressure effect through the negative pressure holes 521, playing an adsorption effect on the diaphragm. Air enters the pressing airbag 35 through the selector valve I 7, causing the pressing airbag 35 to squeeze the movable frame 33. The movable frame 33 moves downward to drive the sample loading roller 34 downward. The sample loading roller 34 presses on the diaphragm, and all four sides of the diaphragm are stably pressed, improving the reliability of the test.

[0065] When performing a standard penetration test, the solenoid valve 43 is normally open. Air enters from the upper part of the air storage cylinder 42 through the selector valve II 8, thereby squeezing the piston 45 to drive the detection probe 44 to descend along the standard speed until it penetrates the diaphragm, and the test ends. The maximum penetration load of the diaphragm is detected by the pressure sensor. After the penetration ends, by switching the air inlet to the air storage cylinder 42 through the selector valve II 8, the piston 45 can drive the detection probe 44 to move upward and return to its original position.

[0066] When performing a high-speed penetration test, the solenoid valve 43 is first closed. Air enters from the upper part of the air storage cylinder 42 through the selector valve II 8, and the air pressure in the air storage cylinder 42 gradually increases. After the air pressure increases to a certain intensity, the solenoid valve 43 is opened. Under the impact of the high air pressure, the piston 45 drives the detection probe 44 to accelerate downward and quickly penetrate the diaphragm, used to simulate the penetration performance of the diaphragm under more extreme conditions. After the test ends, the detection probe 44 is restored to its original position.

[0067] III. Tensile test:

[0068] Start the air pump 6. The working plate 52 has a certain adsorption effect on the diaphragm to prevent the diaphragm from deviating. Air enters the support airbag 36 through the selector valve II 8. The support airbag 36 inflates and bulges upward to squeeze the movable frame 33, causing the movable frame 33 to move upward along the sliding rod 32 away from the diaphragm, avoiding the sample loading roller 34 at the bottom of the movable frame 33 from contacting the diaphragm and affecting the accuracy of the diaphragm tensile test.

[0069] Air passes through the selection valve III 9 to drive the displacement of the cylinder 53. The cylinder 53 drives the working plate 52 to displace away from the inner cavity 31 along the stretching groove 51. The working plate 52 will drive the movable seat 58 to displace synchronously along the sliding groove 55. The movable seat 58 drives the pressing plate 54 to displace synchronously. The pressing plate 54 drives the guide rod 56 to displace synchronously along the guide groove 57. When the guide rod 56 displaces along the arc groove 571, it will drive the pressing plate 54 to displace downward, so that the pressing plate 54 and the working plate 52 clamp the diaphragm, and the clamping can be automatically carried out without operation.

[0070] The cylinder 53 continues to work until the diaphragm is broken. The maximum tensile strength of the diaphragm can be obtained through the pressure sensor. By controlling the selection valve III 9, the cylinder 53 can be selectively controlled, so that it can be selected between unilateral stretching, unidirectional stretching and bidirectional stretching, so as to imitate the complex situation when the diaphragm is stressed in reality as much as possible.

[0071] It should be specially noted that when carrying out unilateral stretching, it is necessary to inflate both cylinders 53 on both sides until the guide rod 56 enters the straight groove 572. After the pressing plate 54 and the working plate 52 clamp and fix the diaphragm, the unilateral stretching test is carried out by disconnecting one side of the cylinder 53.

[0072] After the stretching test is completed, by resetting the cylinder 53, the working plate 52 can be driven to reset. The working plate 52 drives the movable seat 58, the pressing plate 54 and the guide rod 56 to displace synchronously. After the guide rod 56 passes through the arc groove 571, under the action of the spring, the pressing plate 54 displaces upward along the movable seat 58 and completely disengages from the diaphragm.

[0073] III. Simultaneous stretching and puncture test:

[0074] Please refer to Figure 14 , when carrying out the test of stretching first and then puncturing, first operate the above stretching test to stretch the diaphragm to a certain extent and then stop the cylinder 53. The selection valve I 7 is directly connected to the selection valve II 8, and then by closing the valve between the pressing air bag 35 and the selection valve II 8, the pressing air bag 35 will not be inflated, so as to avoid the pressing air bag 35 affecting the test of the diaphragm. Then, the stretched diaphragm is subjected to a puncture test through the operation of the puncture test.

[0075] Please refer to Figure 14 , when the stretching test and the puncture test are carried out simultaneously, start the air pump 6, and the working plate 52 has a certain adsorption effect on the diaphragm. Through the selection valve I 7, the air pump 6 is simultaneously connected to the supporting air bag 36 and the selection valve II 8, and then by closing the valve between the pressing air bag 35 and the selection valve II 8, the pressing air bag 35 will not be inflated, so as to avoid the pressing air bag 35 affecting the test of the diaphragm. At this time, the stretching test and the puncture test are carried out simultaneously, which can provide more comprehensive data for the mechanical property detection of the diaphragm.

[0076] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or apparatus.

[0077] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A diaphragm mechanical property testing device, comprising a base (1) and a top seat (2), wherein the base (1) and the top seat (2) are fixedly connected, and characterized in that: The top seat (2) is provided with a puncture mechanism (4) for performing a puncture test on the diaphragm; the base (1) is provided with a sample loading mechanism (3) for loading and unloading the diaphragm; the base (1) is also provided with a plurality of stretching mechanisms (5) for performing a stretching test on the diaphragm, wherein the number of the stretching mechanisms (5) is two or four and the stretching mechanisms (5) are symmetrically arranged along the center of the base (1); an air pressure distribution mechanism is arranged between the sample loading mechanism (3), the puncture mechanism (4) and the stretching mechanism (5) for controlling air flow; the stretching mechanism (5) comprises a stretching groove (51), wherein the stretching groove (51) is provided at the top end of the base (1), wherein a working plate (52) is slidably mounted in the stretching groove (51), and wherein a working plate (52) is fixedly connected to the working plate (52) The cylinder (53) comprises a negative pressure hole (521) on the working plate (52), a one-way valve fixedly mounted on the working plate (52), a sliding groove (55) on the base (1), a movable seat (58) slidably mounted in the sliding groove (55), the sliding groove (55) and the stretching groove (51) are connected, the movable seat (58) and the working plate (52) are fixedly connected, a clamping plate (54) is mounted in the movable seat (58) via a spring, a guide groove (57) is further formed on the base (1), the guide groove (57) is connected by an arc groove (571) and a straight groove (572), a guide rod (56) is fixedly mounted on the clamping plate (54), and the guide rod (56) and the guide groove (57) are adapted to each other.

2. A diaphragm mechanical property detection device according to claim 1, characterized in that: The loading mechanism (3) comprises an inner cavity (31), the inner cavity (31) being opened at the center position of the top end of the base (1), sliding rods (32) being fixedly mounted on the base (1) at the four corners of the inner cavity (31), a movable frame (33) being slidably mounted on the sliding rod (32), and a plurality of loading rollers (34) being rotatably mounted on the bottom end of the movable frame (33).

3. A diaphragm mechanical property detection device according to claim 2, characterized in that: A pressing airbag (35) is fixedly installed between the movable frame (33) and the top end of the sliding rod (32), and a supporting airbag (36) is fixedly installed between the movable frame (33) and the base (1).

4. A diaphragm mechanical property testing device according to claim 1, characterized in that: The puncture mechanism (4) comprises an air storage cylinder (42), the air storage cylinder (42) being fixedly connected to the top seat (2), the bottom end of the air storage cylinder (42) being fixedly connected to a syringe (41), a piston (45) being slidably mounted in the syringe (41), a detection probe (44) being fixedly mounted at the bottom end of the piston (45), and a solenoid valve (43) being fixedly mounted between the air storage cylinder (42) and the syringe (41).

5. A diaphragm mechanical property testing device according to claim 1, characterized in that: The air pressure distribution mechanism comprises an air pump (6), the working plate (52) is connected to the air inlet of the air pump (6), the air outlet of the air pump (6) is fixedly connected to a selection valve 1 (7), the selection valve 1 (7) is fixedly connected to a compression air bag (35) and a support air bag (36) through pipelines, the compression air bag (35) is fixedly connected to a selection valve 2 (8) through a pipeline, and the selection valve 2 (8) is connected to the puncture mechanism (4) through a pipeline.

6. A diaphragm mechanical property testing device according to claim 5, characterized in that: The support airbag (36) is fixedly connected to a selector valve (9) via a pipeline, and the selector valve (9) is fixedly connected to the cylinder (53) via a pipeline.

7. A diaphragm mechanical property testing device according to claim 5 or 6, characterized in that: The selection valve 1 (7) and the selection valve 2 (8) are connected via a pipeline, and a valve is provided on the pipeline between the compression airbag (35) and the selection valve 2 (8).

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