A device for testing the physical and chemical properties of a diaphragm

Abstract

The present invention relates to the technical field of membrane testing equipment, and specifically to a membrane physical and chemical performance testing device, comprising a box; an air pressure testing mechanism for air permeability testing; an aging testing mechanism for aging testing; a clamping mechanism for clamping the membrane; an infiltration mechanism for wettability testing; the air pressure testing mechanism is arranged at the top of the box, the aging testing mechanism and the infiltration mechanism are arranged at the bottom of the box, and the clamping mechanism is arranged between the air pressure testing mechanism and the aging testing mechanism. Through the aging performance test, the membrane can be immersed in a high-temperature electrolyte to simulate the condition of the membrane during long-term use, and the strength of the membrane can be tested by using air pressure after a set time interval, so that the aging performance of the membrane can be tested, and at the same time, the wettability test of the membrane can be performed using the electrolyte before the aging test of the membrane, thereby improving the testing efficiency of different performances of the membrane.

Description

Technical Field

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

[0002] The diaphragm is a thin film used to separate the positive and negative electrodes during the electrolytic reaction to prevent the loss of energy in the electrolytic cell due to direct reaction. In the structure of lithium batteries, the diaphragm is one of the key internal components. The performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the battery's capacity, cycle and safety performance. A diaphragm with excellent performance plays an important role in improving the overall performance of the battery. The diaphragm is immersed in the electrolyte for a long time, and the battery will generate a lot of heat during the charging and discharging process, which will cause the battery and the electrolyte inside the battery to heat up. Therefore, the diaphragm immersed in high-temperature acid for a long time will age, and the strength of the diaphragm will decrease accordingly. The probability of damage when under pressure will increase accordingly, which poses a safety risk. Therefore, the diaphragm should be subjected to various physical and chemical performance tests such as aging performance test and wettability test.

[0003] In the prior art, different testing instruments need to be used for different tests, and the membrane sample needs to be moved to different testing instruments during the test, which makes the test process very complicated and the test efficiency low. In view of this, we propose a membrane physical and chemical property testing device. Summary of the invention

[0004] The object of the present invention is to provide a device for detecting the physical and chemical properties of a diaphragm, which solves the problems mentioned in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A diaphragm physical and chemical performance detection device comprises a box body;

[0007] Air pressure testing mechanism, used for air permeability testing;

[0008] Aging test agency, used for aging test;

[0009] A clamping mechanism for clamping the diaphragm;

[0010] Wetting mechanism, used for wettability test;

[0011] The air pressure test mechanism is arranged at the top of the box, the aging test mechanism and the immersion mechanism are arranged at the bottom of the box, the clamping mechanism is arranged between the air pressure test mechanism and the aging test mechanism, the air pressure test mechanism includes a test tube, the test tube is slidably connected in the middle of the box, and two test tubes are provided and the two test tubes are connected end to end;

[0012] The clamping mechanism includes a support frame, which is connected to the outer end of the test tube, a ventilation tube is fixedly connected to the side of the support frame, a moving rod is slidably connected to the side of the support frame, and an air bag is fixedly connected to the end of the moving rod. When the gas pressure inside the support frame increases, the moving rod moves outward under the action of the internal gas pressure, and the air bag is used to stretch different sides of the diaphragm outward, and the test tube moves downward to clamp the diaphragm tightly.

[0013] Preferably, a sealing gasket is fixedly connected to the end of the test tube, an input assembly is connected to the top of the test tube, a limit ring is rotatably connected to the top of the outer side of the test tube, a limit block is fixedly connected to the outer side of the limit ring, and a limit groove corresponding to the limit block structure is opened at the top of the box body.

[0014] Preferably, a limiting hole corresponding to the test tube structure is opened inside the box body, an operating cavity is opened on one side of the box body, and a protective door is rotatably connected to the operating cavity.

[0015] Preferably, the input assembly comprises a test cylinder, the test cylinder is fixedly connected to the top of the box body, a limit plate is fixedly connected to the middle of the test cylinder, a guide frame is slidably connected to the limit plate, and a piston is fixedly connected to the end of the guide frame.

[0016] Preferably, contact springs are fixedly connected to both ends of the piston, the limit plate and the test cylinder, and a timer is fixedly connected to the outside of the test cylinder. The contact springs are used to control the opening and closing of the timer.

[0017] Preferably, the test tube is sleeved on the outer bottom end of the test cylinder, a sealing ring is fixedly connected between the inner top end of the test tube and the outer bottom end of the test cylinder, a pressure relief valve is connected to the top end of the test cylinder, an air pump is fixedly connected to the top end of the box body, and an output end of the air pump is connected to the inner top end of the test cylinder.

[0018] Preferably, the aging test mechanism includes a liquid storage tank, which is opened at the bottom end of the box body, and a clamping roller is slidably connected to the liquid storage tank, and a positioning tube is slidably connected to the bottom end of the box body, and a driving block is fixedly connected to the side of the positioning tube, and a reciprocating screw is meshingly connected to the driving block, and the bottom end of the reciprocating screw is fixedly connected to a driving assembly.

[0019] Preferably, the infiltration mechanism includes a limiting roller, which is connected to one end of the box body away from the liquid storage tank, an observation window is fixedly connected to the bottom end of the side of the box body, and a reflector is fixedly connected to the bottom end of the inside of the box body.

[0020] Preferably, the driving assembly includes a driving disk, which is rotatably connected to the bottom end of the box body, the top of the driving disk is fixedly connected to a gear ring, the inner side of the gear ring is meshingly connected to a gear, the side of the limiting roller is fixedly connected to a worm wheel, the side of the worm wheel is meshingly connected to a worm, and the gears are respectively fixedly connected to the reciprocating screw and the bottom end of the worm.

[0021] By means of the above technical solution, the present invention provides a membrane physical and chemical properties detection device having at least the following beneficial effects:

[0022] (1) The aging performance test provided by the present invention can immerse the diaphragm in a high-temperature electrolyte to simulate the condition of the diaphragm during long-term use, and use air pressure to test the strength of the diaphragm after a set time interval, so as to detect the aging performance of the diaphragm. At the same time, before the aging test of the diaphragm is performed, the wettability test of the diaphragm can be performed using the electrolyte, thereby improving the testing efficiency of different performances of the diaphragm.

[0023] (2) The present invention can conveniently clamp the diaphragm through the clamping mechanism, and the pneumatic clamping mechanism can automatically clamp and pull the diaphragm, avoiding the tedious operation of the tester fixing multiple sides or multiple corners of the diaphragm on the clamping structure. At the same time, the pressure relief valve on the side of the clamping mechanism can keep the air pressure inside the support frame within a set range, thereby limiting the clamping force of the diaphragm, improving the convenience of loading and avoiding the influence of diaphragm deformation on the air permeability test results of the diaphragm.

[0024] (3) The constant pressure gas permeability detection structure provided in the present invention can utilize the pressure relief valve to keep the gas pressure inside the test tube constant within a set range, thereby avoiding fluctuations in the test gas pressure caused by the test gas passing through the diaphragm during the test, thereby improving the accuracy of the diaphragm gas permeability test. 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] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0027] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0028] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the air pressure testing mechanism of the present invention;

[0030] Figure 5 It is a schematic diagram of the internal structure of the air pressure testing mechanism of the present invention.

[0031] Figure 6 It is a schematic diagram of the structure of the aging test mechanism of the present invention;

[0032] Figure 7 It is a schematic diagram of the internal structure of the support frame of the present invention;

[0033] Figure 8 It is an enlarged schematic diagram of point A of the present invention.

[0034] In the figure: 1, box; 2, air pressure test mechanism; 21, test tube; 22, sealing gasket; 23, input assembly; 231, test tube; 232, limit plate; 233, guide frame; 234, piston; 235, contact spring; 2351, contact spring 1; 2352, contact spring 2; 236, timer; 237, sealing ring; 238, pressure relief valve; 239, air pump; 24, limit ring; 25, limit block; 26, limit groove; 3, aging test Test mechanism; 31. Liquid storage tank; 32. Clamping roller; 35. Positioning tube; 36. Reciprocating screw; 37. Driving assembly; 371. Driving disk; 372. Gear ring; 373. Gear; 374. Worm wheel; 375. Worm; 4. Clamping mechanism; 41. Support frame; 42. Ventilation pipe; 43. Moving rod; 44. Air bag; 45. Limiting hole; 46. Operating chamber; 47. Protective door; 5. Immersion mechanism; 51. Limiting roller; 52. Observation window; 6. Heating rod. DETAILED DESCRIPTION

[0035] 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. Example

[0036] A device for detecting the physical and chemical properties of a diaphragm, such as Figure 1-Figure 5 , Figure 8 As shown, it includes a box body 1; an air pressure testing mechanism 2 is arranged on the top of the box body 1 for air permeability testing. The air pressure testing mechanism 2 can transport a set volume of gas stored inside the gas storage structure to the outside at a constant pressure, thereby testing the air permeability of the diaphragm.

[0037] Specifically, the air pressure testing mechanism 2 includes a test tube 21, which is slidably connected in the middle of the box body 1. The slidably connected test tube 21 can conveniently adjust its own position, so as to open the position where the diaphragm is placed, so as to facilitate the adjustment of the position of the diaphragm and the test operation. The inside of the test tube 21 is divided into four independent tube structures by the tube wall, so that the air permeability test operation can be performed on different positions of the diaphragm at the same time. There are two test tubes 21 and the two test tubes 21 are connected end to end. A sealing gasket 22 is fixedly connected to the end of the test tube 21, and the sealing gasket 22 structure can cooperate with each other to seal the gap between the test tubes 21, so as to ensure the sealing performance between the test tube 21 and the test diaphragm during the test process. An input component 23 is connected to the top of the test tube 21, and the input component 23 can make a quantitative volume of gas flow to the diaphragm at a set air pressure through the test tube 21 to perform an air permeability test operation. The top of the outer side of the test tube 21 is rotatably connected to a limit ring 24 , the outer side of the limit ring 24 is fixedly connected to a limit block 25 , and the top of the box body 1 is provided with a limit groove 26 corresponding to the limit block 25 structure.

[0038] On this basis, the input component 23 includes a test cylinder 231, which is fixedly connected to the top of the box body 1. The test cylinder 231 structure can temporarily store the air to be tested. A limiting plate 232 is fixedly connected to the middle of the test cylinder 231. The limiting plate 232 can separate the space inside the test cylinder 231, so that the test cylinder 231 is divided into two spaces. A guide frame 233 is slidably connected to the limiting plate 232, and a piston 234 is fixedly connected to the end of the guide frame 233. The guide frame 233 structure can guide the piston 234 so that the piston 234 can move smoothly and keep the airflow stable during the test. At the same time, the structure at the end of the guide frame 233 can limit the movement of the piston 234, thereby preventing the piston 234 from moving excessively.

[0039] In addition, contact springs 235 are fixedly connected to both ends of the piston 234, the limit plate 232 and the test cylinder 231. The contact spring 235 structure can detect the position of the piston 234, thereby detecting the time for the piston 234 to move from one end to the other end. A timer 236 is fixedly connected to the outside of the test cylinder 231. The timer 236 structure can display the detected time value. The contact spring 235 is provided with two groups, namely, a contact spring 1 2351 fixedly connected to the bottom end of the limit plate 232 and the top end of the piston 234, and a contact spring 2 2352 fixedly connected to the bottom end of the test cylinder 231 and the bottom end of the piston 234. After the contact springs 235 are separated and disconnected from each other, the timer 236 starts timing accordingly, so that the time recorded by the timer 236 is the time for the piston 234 to move from the top to the bottom.

[0040] On this basis, the test tube 21 is sleeved on the outer bottom end of the test cylinder 231, and a sealing ring 237 is fixedly connected between the inner top end of the test tube 21 and the outer bottom end of the test cylinder 231. The sealing ring 237 structure can seal the gap between the test tube 21 and the test cylinder 231, thereby preventing the test air from leaking from the gap. A pressure relief valve 238 is connected to the top end of the test cylinder 231, and the pressure relief valve 238 can release the pressure inside the test cylinder 231, thereby keeping the air pressure inside the test cylinder 231 within a stable range. An air pump 239 is fixedly connected to the top end of the box body 1, and the output end of the air pump 239 is connected to the inner top end of the test cylinder 231. The air pump 239 structure can continuously pump air into the test cylinder 231 and keep the inside of the test cylinder 231 within a stable pressure range, thereby preventing air pressure fluctuations from affecting the air permeability test of the diaphragm. Example

[0041] like Figure 1 , Figure 2 , Figure 3 , Figure 6 As shown, on the basis of Example 1, an aging test mechanism 3 and an infiltration mechanism 5 are provided at the bottom of the box body 1 for aging test and wettability test; the aging test mechanism 3 can immerse the diaphragm in the electrolyte and perform a permeability test after a set time interval, so as to test the service life of the diaphragm.

[0042] In this embodiment, the aging test mechanism 3 includes a liquid storage tank 31, which is opened at the bottom of the box body 1. The liquid storage tank 31 structure can store electrolyte, so that the diaphragm roll can be soaked with electrolyte. At the same time, before soaking for aging test, one end of the diaphragm can be pulled out from the liquid storage tank 31 and the diaphragm can be kept in a tight state, so that the wettability test operation can be performed simultaneously. At the same time, an inclined mirror is connected to the bottom of the box body 1, and an observation window 52 made of transparent material is fixedly connected to the bottom of the side of the box body 1, so that the tester can observe the wettability test of the diaphragm in real time. In addition, a heating rod 6 is fixedly connected to the side of the storage tank or the inside of the storage tank, so that the electrolyte inside is kept within a set temperature range, so as to perform an accelerated aging test on the diaphragm. A clamping roller 32 is slidably connected to the liquid storage tank 31, and the clamping roller 32 structure can clamp and wrap the diaphragm and place the diaphragm inside the storage tank. One end of the box body 1 away from the liquid storage tank 31 is connected to a limiting roller 51. The limiting roller 51 structure can limit the other end of the diaphragm, so that the diaphragm can be rolled up during the aging test.

[0043] Furthermore, a positioning tube 35 is slidably connected to the bottom of the box body 1, and the positioning tube 35 can conveniently adjust its position. At the same time, a sealing structure is fixedly connected to the top of the positioning tube 35, so that during the test process, the diaphragm can be driven through the top of the positioning tube 35 and the bottom of the test tube 21 can be sealed through the diaphragm, so that the air permeability test of the diaphragm after the aging test can be performed using the input component 23 after the aging test. A driving block is fixedly connected to the side of the positioning tube 35, and a reciprocating screw 36 is meshedly connected to the driving block. The reciprocating screw 36 structure can drive the positioning tube 35 to move reciprocatingly. A driving assembly 37 is fixedly connected to the bottom of the reciprocating screw 36, and the driving assembly 37 can drive the reciprocating screw 36. A reflector is fixedly connected to the bottom of the box body 1.

[0044] On this basis, the driving assembly 37 includes a driving disk 371, which is rotatably connected to the bottom end of the box body 1. The bottom end of the driving disk 371 structure can be connected to a driving device. In this embodiment, the driving device is a motor. A gear ring 372 is fixedly connected to the top of the driving disk 371, and a gear 373 is meshed and connected to the inner side of the gear ring 372. The gear ring 372 can cooperate with the gear 373 to drive the gear 373 through the continuous rotation of the driving disk 371. At the same time, the gear ring 372 is a residual tooth structure, and the two gears 373 can be driven in sequence during the rotation of the driving disk 371. A worm wheel 374 is fixedly connected to the side of the limiting roller 51, and a worm 375 is meshed and connected to the side of the worm wheel 374. The worm wheel 374 can cooperate with the worm 375 to convert the force of the worm 375 rotating in the vertical direction into the force of the worm wheel 374 rotating in the horizontal direction. The gear 373 is fixedly connected to the bottom ends of the reciprocating screw 36 and the worm 375 respectively, and the reciprocating screw 36 and the screw can be driven to rotate by the gear 373. Example

[0045] like Figure 1 , Figure 2 , Figure 3 , Figure 7 As shown, on the basis of Example 2, a clamping mechanism 4 is arranged between the air pressure testing mechanism 2 and the aging testing mechanism 3 for clamping the diaphragm; the clamping mechanism 4 can uniformly clamp the diaphragm so that different sides of the diaphragm are subjected to the same clamping force, thereby improving the clamping effect of the diaphragm and avoiding excessive clamping that causes deformation of the diaphragm and affects the air permeability test effect of the diaphragm.

[0046] In this embodiment, the clamping mechanism 4 includes a support frame 41, which is connected to the outer end of the test tube 21. The support frame 41 is connected to a pressure relief valve 238, and the pressure relief valve 238 can control the gas pressure inside the support frame 41. A vent pipe 42 is fixedly connected to the side of the support frame 41. The support frame 41 is a hollow structure inside and is connected to the vent pipe 42. A one-way valve is fixedly connected inside the vent pipe 42. The tester can manually pump air into the support frame 41 through a syringe, a piston cylinder or an ear washing ball structure. A moving rod 43 is slidably connected to the side of the support frame 41, and an air bag 44 is fixedly connected to the end of the moving rod 43. After the gas pressure inside the support frame 41 increases, the moving rod 43 moves outward under the action of the internal air pressure, and uses the air bag 44 to stretch different sides of the diaphragm outward. At the same time, since the moving rod 43 is subjected to the same force, the driving force on different sides of the diaphragm is the same, so the diaphragm can be kept flat.

[0047] In addition, a limiting hole 45 corresponding to the structure of the test tube 21 is provided inside the box 1, and the limiting hole 45 structure can support and limit the test tube 21, thereby improving the stability of the test tube 21 during the test process. An operating cavity 46 is provided on one side of the box 1, and a protective door 47 is rotatably connected to the operating cavity 46. The operating cavity 46 structure can facilitate the tester to operate the structure inside the box 1.

[0048] When the diaphragm physical and chemical property detection device of the present invention is used, the test tube 21 is first moved upward to move the two test tubes 21 away from each other, and the limit ring 24 is rotated at the same time to make the limit block 25 and the limit groove 26 misaligned with each other, so that the test tube 21 is suspended at the top of the box body 1. Then, the protective door 47 is opened and the diaphragm to be tested is moved to the inside of the operating chamber 46. After the air is continuously pumped into the inside of the support frame 41 through the vent pipe 42, the air pressure inside the support frame 41 continues to increase, and the airbag 44 is pushed outward through the moving rod 43. The airbag 44 then contacts the diaphragm and pushes the diaphragm to move in the direction of the moving rod 43. Since the moving rod 43 is pushed by the air pressure inside the support frame 41, the driving force applied by the airbag 44 to the diaphragm remains the same, so that the diaphragm can be smoothly unfolded. Then, the limit ring 24 is rotated again to make the limit block 25 correspond to the position of the limit groove 26, and the test tube 21 can move downward, and the diaphragm is clamped and tightened by the sealing pad 22 at the end of the test tube 21. During the descent of the test tube 21, the support frame 41 and the moving rod 43 on the side of the support frame 41 are synchronously descended. The airbag 44 and the moving rod 43 are perpendicular to each other, so after the moving rod 43 moves, only the airbag 44 is flattened and deformed, and the clamping state of the diaphragm will not be affected. Then the air pump 239 continues to pump air to the top of the test cylinder 231 until the air pressure at the top of the test cylinder 231 reaches the set value. When the gas pressure inside the test cylinder 231 is too high, the air inside the test cylinder 231 is discharged from the pressure relief valve 238. The air pressure at the upper end of the test cylinder 231 pushes the piston 234 to move downward until the air pressure at both ends of the piston 234 is the same. At this time, the air inside the test cylinder 231 discharges the set volume of air downward at a constant pressure, thereby performing a gas permeability test operation on the diaphragm. When the piston 234 starts to move, the contact spring 235 at the top of the piston 234 and the contact spring 235 at the bottom of the limit plate 232 are separated from each other, and the timer 236 starts timing and displays the time. When the piston 234 moves to the bottom of the test tube 231, the contact spring 235 at the bottom of the piston 234 contacts the contact spring 235 at the bottom of the test tube 231, and the timer 236 stops timing. After the air permeability test operation is completed, the diaphragm can be taken out from the operating chamber 46. The two test tubes 21 are sealed by the sealing gasket 22 at the end.

[0049] When performing a wettability test, the diaphragm is rolled into the liquid storage tank 31 by the clamping roller 32, and one end of the diaphragm is pulled out so that the one end of the diaphragm is fixed on the limiting roller 51. Then, the electrolyte is injected into the liquid storage tank 31, and the electrolyte is infiltrated into the clamping roller 32 and the diaphragm rolled on the clamping roller 32. Then, the infiltration rate of the diaphragm can be observed and timed through the observation window 52 on the side of the box body 1, and the reflector at the bottom of the box body 1 can facilitate the tester to observe the diaphragm.

[0050] When performing the aging performance test, after the wetting rate test operation is completed, the clamping roller 32 and the diaphragm are immersed in the electrolyte for a long time, so that the inner diaphragm wrapped by the clamping roller 32 is soaked. Then the heating rod 6 on the side of the liquid storage tank 31 can be turned on and the electrolyte is heated to a set temperature range to simulate the state of the battery running for a long time, so as to perform an accelerated aging test on the diaphragm. Whenever the preset time interval is reached, the motor starts and drives the driving disk 371 and the gear ring 372 to rotate, and the gear ring 372 then drives the two gears 373 to rotate. Since the gear ring 372 is a residual tooth structure, the gear ring 372 drives the two gears 373 to rotate different numbers of times in turn when rotating one circle. The worm 375 drives the worm wheel 374 to rotate when rotating with the gear 373, and drives the limiting roller 51 to rotate, so that the diaphragm is rolled onto the limiting roller 51. The diaphragm immersed in the electrolyte moves to the bottom of the test tube 21. Then, the reciprocating screw 36 rotates and drives the positioning tube 35 to rise under the drive of the gear 373. The positioning tube 35 then pushes the diaphragm to the bottom of the test tube 21 and seals it through the sealing gasket 22 at the bottom of the test tube 21. Then, the gas pressure inside the test tube 21 is increased again through the input assembly 23, and the strength of the diaphragm is tested by the gas pressure, so as to test the diaphragms with different immersion times, and then test the service life of the diaphragm. During the rotation of the drive disk 371, the positioning tube 35 is first driven downward by the reciprocating screw 36, and then the limiting roller 51 is driven to rotate by the worm 375 and the worm gear 374 to reel and move the diaphragm, and finally, the positioning tube 35 is driven upward by the reciprocating screw 36 to push the diaphragm close to the test tube 21.

[0051] 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.

[0052] 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 device for detecting the physical and chemical properties of a diaphragm, characterized in that: comprising a box body (1); An air pressure testing mechanism (2) for air permeability testing; Aging test organization (3), used for aging test; A clamping mechanism (4) for clamping the diaphragm; A wetting mechanism (5) for wettability testing; The air pressure test mechanism (2) is arranged at the top of the box (1), the aging test mechanism (3) and the immersion mechanism (5) are arranged at the bottom of the box (1), the clamping mechanism (4) is arranged between the air pressure test mechanism (2) and the aging test mechanism (3), the air pressure test mechanism (2) comprises a test tube (21), the test tube (21) is slidably connected in the middle of the box (1), and two test tubes (21) are provided and the two test tubes (21) are connected end to end; The clamping mechanism (4) comprises a support frame (41), the support frame (41) being connected to the outer end of the test tube (21), a ventilation tube (42) being fixedly connected to the side of the support frame (41), a moving rod (43) being slidably connected to the side of the support frame (41), and an air bag (44) being fixedly connected to the end of the moving rod (43), and when the internal gas pressure of the support frame (41) increases, the moving rod (43) moves outward under the action of the internal gas pressure, and the air bag (44) is used to stretch different sides of the diaphragm outward, and the test tube (21) moves downward to clamp and tighten the diaphragm.

2. A membrane physical and chemical properties detection device according to claim 1, characterized in that: The end of the test tube (21) is fixedly connected to a sealing gasket (22), the top of the test tube (21) is connected to an input assembly (23), the top of the outer side of the test tube (21) is rotatably connected to a limit ring (24), the outer side of the limit ring (24) is fixedly connected to a limit block (25), and the top of the box body (1) is provided with a limit groove (26) corresponding to the structure of the limit block (25).

3. A membrane physical and chemical properties detection device according to claim 2, characterized in that: The input assembly (23) comprises a test cylinder (231), the test cylinder (231) being fixedly connected to the top end of the box body (1), a limit plate (232) being fixedly connected to the middle of the test cylinder (231), a guide frame (233) being slidably connected to the limit plate (232), and a piston (234) being fixedly connected to the end of the guide frame (233).

4. The device for detecting the physical and chemical properties of a diaphragm according to claim 1, characterized in that: A limiting hole (45) corresponding to the structure of the test tube (21) is provided inside the box body (1), an operating chamber (46) is provided on one side of the box body (1), and a protective door (47) is rotatably connected to the operating chamber (46).

5. The device for detecting the physical and chemical properties of a diaphragm according to claim 3, characterized in that: Contact springs (235) are fixedly connected to both ends of the piston (234), the limit plate (232) and the test cylinder (231); a timer (236) is fixedly connected to the outside of the test cylinder (231); the contact spring (235) is used to control the opening and closing of the timer (236).

6. A membrane physical and chemical properties testing device according to claim 2, characterized in that: The test tube (21) is sleeved on the outer bottom end of the test cylinder (231); a sealing ring (237) is fixedly connected between the inner top end of the test tube (21) and the outer bottom end of the test cylinder (231); a pressure relief valve (238) is connected to the top end of the test cylinder (231) and the support frame (41); an air pump (239) is fixedly connected to the top end of the box body (1); and an output end of the air pump (239) is communicated with the inner top end of the test cylinder (231).

7. A membrane physical and chemical properties testing device according to claim 1, characterized in that: The aging test mechanism (3) comprises a liquid storage tank (31), the liquid storage tank (31) is disposed at the bottom end of the box body (1), a clamping roller (32) is slidably connected to the liquid storage tank (31), a positioning tube (35) is slidably connected to the bottom end of the box body (1), a driving block is fixedly connected to the side of the positioning tube (35), a reciprocating screw rod (36) is meshingly connected to the driving block, and a driving assembly (37) is fixedly connected to the bottom end of the reciprocating screw rod (36).

8. A membrane physical and chemical properties testing device according to claim 7, characterized in that: The infiltration mechanism (5) comprises a limiting roller (51), the limiting roller (51) being connected to an end of the box body (1) away from the liquid storage tank (31), an observation window (52) being fixedly connected to the bottom end of the side of the box body (1), and a reflector being fixedly connected to the bottom end of the interior of the box body (1).

9. A membrane physical and chemical properties testing device according to claim 8, characterized in that: The driving assembly (37) comprises a driving disk (371), the driving disk (371) being rotatably connected to the bottom end of the box body (1), the top end of the driving disk (371) being fixedly connected to a toothed ring (372), the inner side of the toothed ring (372) being meshingly connected to a gear (373), the side of the limiting roller (51) being fixedly connected to a worm wheel (374), the side of the worm wheel (374) being meshingly connected to a worm (375), and the gear (373) being fixedly connected to the reciprocating screw (36) and the bottom end of the worm (375), respectively.

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