Diaphragm mechanical property detection device

Abstract

The invention relates to the technical field of diaphragm performance detection devices, in particular to a diaphragm mechanical performance detection device which comprises a base and a top seat, the base and the top seat are fixedly connected, and a puncture mechanism is arranged on the top seat and used for conducting a puncture test on a diaphragm; and a sample loading mechanism is arranged on the base. By arranging the sample loading mechanism, the puncture mechanism, the stretching mechanism and the air pressure distribution mechanism, when a mechanical property test is carried out on the diaphragm, a tensile test, a puncture test and a puncture and stretching synchronous test can be selected, and the conditions of each test can be controlled; and more detection data which is more in line with practical significance is provided for mechanical detection of the diaphragm, so that more comprehensive and effective test data is provided for evaluating the mechanical property of the diaphragm. Meanwhile, the sample loading mechanism effectively simplifies the disassembly and clamping steps of the diaphragm sample, and avoids the problem that the loading and sampling of the diaphragm sample are time-consuming and labor-consuming.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm performance detection devices, and in particular to a diaphragm mechanical performance detection device. Background Art

[0002] In the structure of lithium batteries, the diaphragm is one of the key internal 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 tests of existing lithium battery separators, the main mechanical properties tests are separator tensile strength tests and separator puncture strength tests. Through mechanical property testing, the physical strength of the separator can be evaluated to ensure that it can maintain stable performance in a complex physical environment and prevent battery short circuits or other safety issues caused by separator damage.

[0004] However, in the existing diaphragm mechanical property testing, the puncture test and the tensile test are currently conducted separately, and the compatibility of the equipment is poor. At the same time, during the test, multiple repetitive tests are required to reduce the error. In each test, the sample needs to be manually replaced or moved, and the sample disassembly and clamping steps are time-consuming and laborious.

[0005] In view of this, we propose a device for testing the mechanical properties of diaphragms. Summary of the invention

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

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A diaphragm mechanical property testing device comprises a base and a top seat, wherein the base and the top seat are fixedly connected, and a puncture mechanism is arranged on the top seat for performing a puncture test on the diaphragm;

[0009] The base is provided with a sample loading mechanism for loading and unloading samples from the diaphragm;

[0010] The base is also provided with a stretching mechanism for performing a stretching test on the diaphragm, and the stretching mechanisms are provided in two or four pieces and are 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 to control the air flow.

[0012] Preferably, the stretching mechanism includes a stretching groove, which is opened at the top of the base, a working plate is slidably installed in the stretching groove, a cylinder is fixedly connected to the working plate, a negative pressure hole is opened on the working plate, and a one-way valve is fixedly installed on the working plate.

[0013] Preferably, a sliding groove is provided on the base, a movable seat is slidably installed in the sliding groove, a clamping plate is installed in the movable seat via a spring, the sliding groove is communicated with the stretching groove, and the movable seat and the working plate are fixedly connected.

[0014] Preferably, a guide groove is further provided on the base, and the guide groove is composed of an arc groove and a straight groove connected together. A guide rod is fixedly mounted on the clamping plate, and the guide rod is adapted to the guide groove.

[0015] Preferably, the loading mechanism includes an inner cavity, which is opened at the center of the top of the base, and sliding rods are fixedly installed on the base at the four corners of the inner cavity, and a movable frame is slidably installed on the sliding rods, and a plurality of loading rollers are rotatably installed on the bottom end of the movable frame.

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

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

[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 with a selection valve 1, the selection valve 1 is fixedly connected to the compression airbag and the support airbag through pipelines, the compression airbag is fixedly connected with a selection valve 2 through a pipeline, and the selection valve 2 is connected to the puncture mechanism through a pipeline.

[0019] Preferably, the support airbag is fixedly connected to a selection valve three via a pipeline, and the selection valve three is fixedly connected to the cylinder via a pipeline.

[0020] Preferably, the selection valve 1 is connected to the selection valve 2 through a pipeline, and a valve is provided on the pipeline between the compression airbag and the selection valve 2.

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

[0022] (1) The present invention provides a sample loading mechanism, a puncture mechanism, a stretching mechanism, and an air pressure distribution mechanism, so that when the mechanical properties of the diaphragm are tested, a selection 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, providing 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 steps of disassembling and clamping the diaphragm sample, avoiding the time-consuming and labor-intensive problem of loading and sampling the diaphragm sample.

[0023] (2) The present invention provides a sample loading mechanism, a puncture mechanism, an air pump, a first selector valve, and a second selector valve, so that when performing a puncture test on the diaphragm, a choice can be made between a standard puncture test and a high-speed puncture test, thereby testing the puncture performance of the diaphragm under normal conditions and more extreme conditions. At the same time, when performing a puncture test on the diaphragm, the diaphragm is automatically clamped by moving the movable frame downward, thereby improving the efficiency and stability of the test.

[0024] (3) The present invention provides a sample loading mechanism, a stretching mechanism, an air pump, a selector valve 1, and a selector valve 3, so that when the diaphragm is subjected to a tensile test, the diaphragm can be selectively subjected to unilateral stretching, unidirectional stretching, and bidirectional stretching, thereby simulating a variety of 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 displacement of the clamping plate automatically cooperates with the working plate to clamp and fix the diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Fig. 1 is a schematic diagram of the structure of the present invention;

[0027] FIG2 is a schematic diagram of a sample loading mechanism of the present invention;

[0028] FIG3 is a schematic diagram of the split structure of FIG2 of the present invention;

[0029] FIG4 is a partially enlarged schematic diagram of FIG3 of the present invention;

[0030] FIG5 is a schematic diagram of a puncture mechanism of the present invention;

[0031] FIG6 is a cross-sectional schematic diagram of the puncture mechanism of the present invention;

[0032] FIG7 is a schematic diagram of a stretching mechanism of the present invention;

[0033] FIG8 is a schematic diagram of a working plate and its connection structure of the present invention;

[0034] FIG9 is a schematic diagram of the disassembly of the pressing plate and the movable seat of the present invention;

[0035] FIG10 is a schematic diagram of the guide groove and the sliding groove structure of the present invention;

[0036] FIG11 is an enlarged schematic diagram of area A in FIG10 of the present invention;

[0037] FIG12 is a schematic diagram of the connection between the cylinder and the pipeline of the present invention;

[0038] FIG13 is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0039] FIG. 14 is a schematic diagram of pipeline connection according to the third embodiment of the present invention.

[0040] In the figure: 1. base; 2. top seat; 3. 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. clamping plate; 55. sliding groove; 56. guide rod; 57. guide groove; 571. arc groove; 572. straight groove; 58. movable seat. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0045] Embodiment 1

[0046] Please refer to Figures 1 to 14, a diaphragm mechanical property testing device includes a base 1 and a top seat 2, the base 1 and the top seat 2 are fixedly connected, a loading mechanism 3 is provided on the base 1, which is used to load and fix the diaphragm, and there is no need to fix the diaphragm before the test, so that the diaphragm is more convenient and stable when being injected and withdrawn.

[0047] The top seat 2 is provided with a puncture mechanism 4 for performing a puncture test on the diaphragm, and can perform a stable puncture test and an instantaneous puncture test according to requirements, and detect the puncture performance of the diaphragm according to the data of the puncture test.

[0048] The base 1 is also provided with a stretching mechanism 5 for performing a stretching test on the diaphragm, and the stretching conditions can be adjusted to obtain a stretching test result that is more in line with reality.

[0049] An air pressure distribution mechanism is provided between the sample loading mechanism 3, the puncture mechanism 4 and the stretching mechanism 5, and is used to control the operation of the sample loading mechanism 3, the puncture mechanism 4 and the stretching mechanism 5, so as to realize the control of the diaphragm mechanical property test items.

[0050] Please refer to Figures 2 to 4. The loading mechanism 3 includes an inner cavity 31, which is opened at the center of the top of the base 1, so that the base 1 will not block the puncture mechanism 4 when the puncture test is performed on the diaphragm, so that the result of the puncture test is 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 rod 32. The movable frame 33 is an internally hollow structure, so that the movable frame 33 will not affect the puncture test of the diaphragm. A plurality of loading rollers 34 are rotatably installed at the bottom end of the movable frame 33. The plurality of loading rollers 34 are distributed in an array, and adjacent loading rollers 34 are connected by a conveyor belt. By rotating one loading roller 34, all the loading rollers 34 can be driven to rotate synchronously, so the diaphragm can be transported by friction, which is used for diaphragm detection sampling and sample replacement after the detection.

[0051] A compression airbag 35 is fixedly installed between the movable frame 33 and the top of the sliding rod 32. The compression airbag 35 is sleeved on the surface of the sliding rod 32. The compression airbag 35 can press down the movable frame 33 when it expands, so that the movable frame 33 can fix the diaphragm during puncture detection. A support airbag 36 is fixedly installed between the movable frame 33 and the base 1. The support airbag 36 is sleeved on the surface of the sliding rod 32. When the support airbag 36 is inflated, it can prop up the movable frame 33 to prevent the movable frame 33 from affecting the tensile test of the diaphragm.

[0052] Please refer to Figures 5-6. The puncture mechanism 4 includes an air cylinder 42, which is fixedly mounted at the bottom end of the top seat 2. The bottom end of the air cylinder 42 is fixedly connected to a syringe 41. A piston 45 is slidably mounted in the syringe 41, and a detection probe 44 is fixedly mounted 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 41, so that the detection probe 44 can perform a puncture test on the diaphragm. An electromagnetic valve 43 is connected between the syringe 41 and the air cylinder 42. The inner diameter of the air cylinder 42 is larger than the inner diameter of the syringe 41. When the electromagnetic valve 43 is normally open, the detection probe 44 can move down steadily and at a uniform speed to perform a puncture test on the diaphragm. When the electromagnetic valve 43 is closed, the air pressure accumulates in the air cylinder 42. When the electromagnetic valve 43 is opened, the air pressure will drive the detection probe 44 to move down quickly, so that the performance of the diaphragm for instantaneous puncture can be detected. A pressure sensor is provided on the piston 45, so that recording can be performed during the puncture test.

[0053] Please refer to Figures 7 to 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 of the base 1. A working plate 52 is slidably installed in the stretching groove 51. The top of the working plate 52 is flush with the top of the base 1. There are two working plates 52 and they are arranged relative to the inner cavity 31. A negative pressure hole 521 is opened at the top of the working plate 52, which is used to adsorb the diaphragm during stretching to prevent the diaphragm from detaching. The working plate 52 is fixedly connected to the output shaft of the cylinder 53, so that the cylinder 53 can drive the working plate 52 to move along the stretching groove 51, thereby performing a stretching test on the diaphragm.

[0054] The base 1 is provided with a sliding groove 55, in which a movable seat 58 is slidably installed, the sliding groove 55 is communicated with the stretching groove 51, and the movable seat 58 is fixedly connected with 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, and a guide rod 56 is fixedly installed on the pressing plate 54. A guide groove 57 is also provided on the base 1, and the guide rod 56 and the guide groove 57 are adapted to each other.

[0055] The guide groove 57 is composed of an arc groove 571 and a straight groove 572, so that when the guide rod 56 moves along the guide groove 57, it will first move down along the arc groove 571, and the guide rod 56 drives the clamping plate 54 to move down, so that the clamping plate 54 and the working plate 52 can clamp the diaphragm, and the automatic clamping does not require manual operation, which is simpler and more convenient.

[0056] Please refer to FIG. 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, and a one-way valve is fixedly installed on the working plate 52, so that when the air pump 6 is started, a certain negative pressure will be generated on the working plate 52, thereby generating a certain adsorption effect on the diaphragm, playing a role in strengthening the fixing of the diaphragm. The existence of the one-way valve ensures that the air intake of the air pump 6 will not be affected and the negative pressure of the working plate 52 is stable.

[0057] The air outlet of the air pump 6 is connected to a selection valve 1 7 through a pipeline, the selection valve 1 7 is respectively connected to a compression airbag 35 and a support airbag 36 through pipelines, the compression airbag 35 is connected to a selection valve 2 8 through a pipeline, and the selection valve 2 8 is connected to a puncture mechanism 4 through a pipeline. When performing a puncture test, air will first pass through the compression airbag 35 to inflate the compression airbag 35, and the compression airbag 35 presses the movable frame 33 downward, thereby fixing the diaphragm without the need for manual fixation, which is simpler and more convenient.

[0058] The support airbag 36 is connected to a plurality of selection valves three 9 through a pipeline, and the selection valve three 9 is connected to a cylinder 53 through a pipeline. Before the tensile test, air will first pass through the support airbag 36 to inflate the support airbag 36, and the support airbag 36 will squeeze the movable frame 33 upward, so that the movable frame 33 is away from the diaphragm, avoiding the contact between the sample loading roller 34 at the bottom end of the movable frame 33 and the diaphragm, which will affect the accuracy of the diaphragm tensile test.

[0059] Embodiment 2

[0060] Please refer to Figure 13, the difference between this embodiment and the first embodiment is that there are four stretching mechanisms 5, and they are arranged vertically relative to the inner cavity 31, so that when the diaphragm is subjected to a stretching test, bidirectional or unidirectional stretching can be selectively achieved. Compared with the first embodiment, the advantage of bidirectional stretching test is achieved.

[0061] Embodiment 3

[0062] Please refer to FIG. 14 . The only difference between this embodiment and the first embodiment is that the selection valve 1 7 and the selection valve 2 8 are connected through a pipeline, and a valve is provided on the pipeline between the compression airbag 35 and the selection valve 2 8. Therefore, when performing the puncture test, air can directly enter the selection valve 2 8 through the selection valve 1 7, and by closing the valve between the compression airbag 35 and the selection valve 2 8, the air can reach the selection valve 2 8 without passing through the compression airbag 35. Therefore, the diaphragm stretching and diaphragm puncture tests can be performed simultaneously, providing more comprehensive data for the mechanical property test of the diaphragm.

[0063] When a diaphragm mechanical property testing device is used, the following operations are performed:

[0064] 1. Placement and replacement of diaphragm samples:

[0065] The membrane is flattened and placed between the working plate 52 and the sample loading roller 34 , and the sample loading roller 34 is rotated to drive the membrane sample to move smoothly, thereby achieving the purpose of placing and removing the membrane.

[0066] 2. Puncture test:

[0067] Start the air pump 6, and the air enters the working plate 52 through the one-way valve, so that the working plate 52 generates a certain negative pressure effect through the negative pressure hole 521, which plays an adsorption effect on the diaphragm. The air enters the compression airbag 35 through the selection valve 7, so that the compression airbag 35 squeezes the movable frame 33, and the movable frame 33 moves downward to drive the sample roller 34 to move downward. The sample roller 34 plays a compression role on the diaphragm, and the four sides of the diaphragm are stably compressed, thereby improving the reliability of the test.

[0068] When the standard puncture test is performed, the electromagnetic valve 43 is normally open, and air is introduced from the top of the air storage cylinder 42 through the selector valve 2 8, thereby squeezing the piston 45 to drive the detection probe 44 to descend along the standard speed until it passes through the diaphragm. When the test is completed, the maximum puncture load of the diaphragm is detected by the pressure sensor. After the puncture is completed, the air inlet is switched to the air storage cylinder 42 through the selector valve 2 8, so that the piston 45 drives the detection probe 44 to move upward and return to the original position.

[0069] When conducting a high-speed puncture test, the solenoid valve 43 is closed first, and air is taken in from the top of the air storage cylinder 42 through the selection valve 8, driving the air pressure in the air storage cylinder 42 to gradually increase. 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 move downward at an accelerated speed and quickly penetrate the diaphragm to simulate the puncture performance of the diaphragm under more extreme conditions. After the test, the detection probe 44 is restored to its original position.

[0070] 3. Tensile test:

[0071] When the air pump 6 is started, the working plate 52 has a certain adsorption effect on the diaphragm to prevent the diaphragm from deviating. The air enters the supporting airbag 36 through the selection valve 2 8, and the supporting airbag 36 is inflated and bulges upward to press the movable frame 33, so that the movable frame 33 moves upward along the sliding rod 32 away from the diaphragm, preventing the sample roller 34 at the bottom of the movable frame 33 from contacting the diaphragm, which affects the accuracy of the diaphragm tensile test.

[0072] The air drives the cylinder 53 to move through the selection valve three 9, and the cylinder 53 drives the working plate 52 to move along the stretching groove 51 away from the inner cavity 31. The working plate 52 will drive the movable seat 58 to move synchronously along the sliding groove 55, and the movable seat 58 drives the clamping plate 54 to move synchronously. The clamping plate 54 drives the guide rod 56 to move synchronously along the guide groove 57. When the guide rod 56 moves along the arc groove 571, it will drive the clamping plate 54 to move downward, so that the clamping plate 54 and the working plate 52 clamp the diaphragm, and the clamping can be performed automatically without operation.

[0073] The cylinder 53 continues to work until the diaphragm is broken, and the maximum tensile strength of the diaphragm can be obtained through the pressure sensor. By controlling the selector valve 3 9, the cylinder 53 can be selectively controlled, so that one-side stretching, one-way stretching and two-way stretching can be selected, thereby simulating the complex situation of the diaphragm under stress in reality as much as possible.

[0074] It is particularly noted that when performing unilateral stretching, it is necessary to first inflate the cylinders 53 on both sides until the guide rod 56 enters the straight groove 572, and after the clamping plate 54 and the working plate 52 clamp and fix the diaphragm, the unilateral stretching test is performed on the cylinder 53 on the disconnected side.

[0075] After the tensile test is completed, the working plate 52 can be reset by resetting the cylinder 53. The working plate 52 drives the movable seat 58, the clamping plate 54 and the guide rod 56 to move synchronously. After the guide rod 56 passes through the arc groove 571, the clamping plate 54 moves upward along the movable seat 58 under the action of the spring to completely separate from the diaphragm.

[0076] 3. Stretching and puncture test at the same time:

[0077] Please refer to FIG. 14 . When the test is performed after stretching and then puncturing, the diaphragm is stretched to a certain extent through the above-mentioned stretching test operation, and then the cylinder 53 is stopped, and the selector valve 1 7 is directly connected to the selector valve 2 8, and then the valve between the compression airbag 35 and the selector valve 2 8 is closed, so that the compression airbag 35 will not be inflated, and the compression airbag 35 is prevented from affecting the diaphragm during the test. Then, the puncture test operation is performed on the diaphragm stretched to a certain extent.

[0078] Please refer to FIG. 14 . When the tensile test and the puncture test are performed simultaneously, the air pump 6 is started, and the working plate 52 has a certain adsorption effect on the diaphragm. Through the selection valve 1 7, the air pump 6 is connected to the support airbag 36 and the selection valve 2 8 at the same time. Then, by closing the valve between the compression airbag 35 and the selection valve 2 8, the compression airbag 35 will not be inflated, so as to avoid the compression airbag 35 affecting the diaphragm test. At this time, the tensile test and the puncture test are performed simultaneously, which can provide more comprehensive data for the mechanical property test of the diaphragm.

[0079] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0080] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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 samples from the diaphragm; The base (1) is also provided with a plurality of stretching mechanisms (5) for performing a stretching test on the diaphragm, and the stretching mechanisms (5) are provided in two or four pieces and are symmetrically arranged along the center of the base (1); An air pressure distribution mechanism is provided between the loading mechanism (3), the puncturing mechanism (4) and the stretching mechanism (5) for controlling the flow of air.

2. A diaphragm mechanical property testing device according to claim 1, characterized in that: The stretching mechanism (5) comprises a stretching groove (51), the stretching groove (51) being provided at the top end of the base (1), a working plate (52) being slidably mounted in the stretching groove (51), a cylinder (53) being fixedly connected to the working plate (52), a negative pressure hole (521) being provided on the working plate (52), and a one-way valve being fixedly mounted on the working plate (52).

3. A diaphragm mechanical property detection device according to claim 2, characterized in that: The base (1) is provided with a sliding groove (55), a movable seat (58) is slidably mounted in the sliding groove (55), a pressing plate (54) is mounted in the movable seat (58) via a spring, the sliding groove (55) and the stretching groove (51) are connected, and the movable seat (58) and the working plate (52) are fixedly connected.

4. A diaphragm mechanical property testing device according to claim 3, characterized in that: The base (1) is also provided with a guide groove (57), the guide groove (57) being composed of an arc groove (571) and a straight groove (572) connected together, and a guide rod (56) is fixedly mounted on the clamping plate (54), the guide rod (56) being adapted to the guide groove (57).

5. A diaphragm mechanical property testing 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).

6. A diaphragm mechanical property testing device according to claim 5, 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).

7. 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).

8. A diaphragm mechanical property testing device according to claim 3, 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.

9. A diaphragm mechanical property testing device according to claim 8, 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.

10. A diaphragm mechanical property testing device according to claim 8 or 9, 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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