Proton exchange membrane water electrolysis hydrogen production membrane electrode defect detection equipment

Abstract

The invention discloses proton exchange membrane water electrolysis hydrogen production membrane electrode defect detection equipment, and relates to the technical field of defect detection equipment.The proton exchange membrane water electrolysis hydrogen production membrane electrode defect detection equipment comprises a negative pressure box and a full-automatic gas adsorption instrument.The bottom face of the negative pressure box is provided with a rotating motor, an output shaft of the rotating motor is fixedly connected with a rotating shaft, and the top face of the rotating shaft is connected with a fixing net; one end of the fixed network is rotationally connected with a switching network, and the other end of the switching network is clamped with the fixed network; a lifting groove is formed in the rotating shaft, and a lifting block is slidably connected into the lifting groove. According to the invention, the rotating motor drives the trigger rod to periodically touch the collision column, so that the electrode can regularly shake up and down, the adsorption balance of a gas-solid interface during static degassing is broken, the stripping and diffusion of moisture and impurities in pores are accelerated, and compared with the traditional static degassing, the degassing time is obviously shortened, and the detection efficiency is improved; and the efficiency requirement of industrial batch detection can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of defect detection equipment, and in particular to a proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection equipment. Background Art

[0002] Proton exchange membrane water electrolysis hydrogen production technology has become a research hotspot in the current clean energy field due to its high efficiency and environmental protection.

[0003] As a core component, the pore structure of the membrane electrode (the degree of exposure of the active sites of the catalyst layer and the porosity of the gas diffusion layer) directly affects the electrolysis efficiency and life.

[0004] In defect detection, gas adsorption method is a common means to analyze the pore structure of membrane electrodes, and degassing pretreatment is a key step in this method. It is necessary to remove impurities such as moisture and residual solvents in the electrode pores to avoid interference with the detection results.

[0005] Traditional degassing equipment generally adopts static negative pressure heating, which has the following significant defects:

[0006] In a static environment, the diffusion resistance of gas molecules in the micropores and mesopores of the electrode is large, especially for liquid water or viscous impurities remaining after the operation of the fuel cell. The degassing time is long, which makes it difficult to meet the efficiency requirements of industrial batch testing.

[0007] In view of this, this application is hereby filed. Summary of the Invention

[0008] The purpose of the present invention is to provide a proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device to solve the problems raised in the above background technology.

[0009] In order to solve the above technical problems, the present invention provides a proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection equipment, including a negative pressure box and a fully automatic gas adsorption instrument, the bottom surface of the negative pressure box is provided with a rotating motor, the output shaft of the rotating motor is fixedly connected to a rotating shaft, the top surface of the rotating shaft is connected to a fixed net, one end of the fixed net is rotatably connected to a transfer net, and the other end of the transfer net is clamped with the fixed net; a lifting groove is provided in the rotating shaft, a lifting block is slidably connected in the lifting groove, the top surface of the lifting block is fixedly connected to a trigger rod, the inner bottom surface of the negative pressure box is fixedly connected to a resistance column, and the rotation path of the trigger rod overlaps with the resistance column; a heating device is installed on the top surface of the negative pressure box.

[0010] Furthermore, one end of a connecting shaft is fixedly connected to the top surface of the lifting block, and the other end of the connecting shaft is fixedly connected to the bottom surface of the fixed net.

[0011] Furthermore, a ball is rotatably connected to the top surface of the resistance column, and the resistance column has six locations arranged at equal intervals in a circular array with the axis of the rotating shaft as the center of the circle, and trigger rods are provided on both sides of the top surface of the lifting block.

[0012] Furthermore, a notch is provided on the bottom surface of the lifting slot, one end of a spring is fixedly installed in the notch, the lifting block is hollowed out, and the other end of the spring is fixedly connected to the bottom surface of the lifting block.

[0013] Furthermore, the fixed net and the transfer net are regular hexagonal nets, one end of the fixed net and the transfer net is provided with a matching hinge, and the other end opposite to the fixed net and the transfer net is provided with a connecting port and a docking buckle.

[0014] Furthermore, the four corners of the bottom surface of the negative pressure box are provided with raising columns, the height of the raising columns is higher than that of the rotating motor, and the bottom surface of the raising columns is provided with rubber pads.

[0015] Furthermore, a control sleeve is provided at the center of the top surface of the switching network, and a linear switch and one end of an airbag are respectively provided on the inner top and inner bottom surfaces of the control sleeve.

[0016] Furthermore, a thermal pad is provided between the airbag and the switching network, and the thermal pad is made of copper.

[0017] Furthermore, a sealing door is hinged on the front of the negative pressure box, and a rubber sealing strip adapted to the front of the negative pressure box is provided on the inner side of the sealing door. The sealing door is composed of an outer insulation frame and an inner observation window, and a handrail is fixedly connected to the front of the sealing door.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the present invention, a rotating motor drives the trigger rod to periodically touch the resistance column, causing the electrode to shake up and down regularly, breaking the adsorption balance of the gas-solid interface during static degassing, accelerating the stripping and diffusion of moisture and impurities in the pores. Compared with traditional static degassing, the degassing time is significantly shortened, the detection efficiency is improved, and it can meet the efficiency requirements of industrial batch detection.

[0020] In the present invention, the "thermal and mechanical" conversion characteristics of the airbag are used to replace traditional temperature sensors (thermocouples, RTDs), reducing electronic component failures and avoiding interference of sensor wiring with the vacuum environment in the negative pressure box (air leakage from wire pores). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of one side structure of a proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device;

[0022] Figure 2This is a schematic diagram of the other side of a proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device;

[0023] Figure 3 A schematic diagram of the degassing network structure of a proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 A schematic diagram of the rotating shaft structure of a proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device;

[0026] Figure 6 A schematic cross-sectional view of a proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device;

[0027] Figure 7 This is a schematic diagram of the control sleeve structure of a proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device;

[0028] Figure 8 This is a schematic diagram of the vibration rod structure of a proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device.

[0029] In the figure: 1. Negative pressure box; 11. Sealed door; 12. Handrail; 13. Raise column; 2. Rotating motor; 21. Rotating shaft; 22. Fixed net; 23. Adapter net; 24. Connecting port; 25. Docking buckle; 3. Lifting slot; 31. Lifting block; 32. Connecting shaft; 33. Trigger rod; 34. Resistance column; 35. Ball; 4. Heating device; 41. Control sleeve; 42. Airbag; 43. Linear switch; 44. Thermal pad; 5. Spring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0032] See also Figure 1-8 , the present invention provides a technical solution:

[0033] A proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device includes a negative pressure box 1 and a fully automatic gas adsorption instrument. The bottom surface of the negative pressure box 1 is provided with a rotating motor 2, the output shaft of the rotating motor 2 is fixedly connected to a rotating shaft 21, the top surface of the rotating shaft 21 is connected to a fixed net 22, one end of the fixed net 22 is rotatably connected to a transfer net 23, and the other end of the transfer net 23 is clamped with the fixed net 22; a lifting groove 3 is opened in the rotating shaft 21, a lifting block 31 is slidably connected in the lifting groove 3, the top surface of the lifting block 31 is fixedly connected to a trigger rod 33, the inner bottom surface of the negative pressure box 1 is fixedly connected to a resistance column 34, and the rotation path of the trigger rod 33 overlaps with the resistance column 34; a heating device 4 is installed on the top surface of the negative pressure box 1.

[0034] First, open the negative pressure box 1, and place the proton exchange membrane electrode sample to be tested flatly between the fixed net 22 and the transfer net 23. Fix the electrode through the snap-fit structure (such as buckle, slot) between the transfer net 23 and the fixed net 22 to ensure that the electrode does not fall off during shaking and maintains uniform force.

[0035] Close the negative pressure box 1, and use an external vacuum pump to evacuate the box so that the vacuum degree in the negative pressure box 1 is maintained at ≤10 - 3 mbar, creating a low pressure environment for the degassing process.

[0036] Start the heating device 4 on the top surface of the negative pressure box 1, and set the temperature to 80-150°C according to the characteristics of the electrode material (such as containing Nafion binder and carbon-based material) (real-time monitoring by temperature sensor to avoid exceeding the material tolerance limit).

[0037] The heating device 4 heats the electrodes uniformly to accelerate the vaporization of moisture and volatile impurities (such as residual solvents and reaction by-products) in the pores.

[0038] The rotating motor 2 is turned on, and the motor output shaft drives the rotating shaft 21 to rotate at a set speed (such as 5 to 20 rpm), and the fixed net 22 and the switching net 23 rotate synchronously with the rotating shaft 21.

[0039] When the rotating shaft 21 rotates, the lifting block 31 in the lifting slot 3 rotates along with the rotating shaft 21 , and the end of the trigger rod 33 moves along a circular path.

[0040] When the trigger rod 33 rotates to overlap with the abutment post 34, the trigger rod 33 is pushed upward by the abutment post 34, driving the lifting block 31 to rise briefly in the lifting slot 3;

[0041] After leaving the abutment column 34 , the lifting block 31 falls back under the action of gravity, forming a periodic up and down displacement (the trigger rod 33 and the abutment column 34 touch each other once every rotation, realizing the periodic shaking of the electrode).

[0042] During the above process, the electrode clamped by the fixed net 22 and the transfer net 23 sways slightly up and down as the lifting block 31 rises and falls, prompting the vaporized impurities in the electrode pores to quickly escape from the surface, thereby avoiding incomplete local degassing due to stillness.

[0043] Under the synergistic effect of negative pressure, heating and mechanical shaking, moisture and volatile impurities in the electrode pores are continuously removed.

[0044] When it is detected that the gas composition in the box is stable (i.e., the impurity removal rate approaches zero) or the preset degassing time is reached, the heating device 4 and the rotating motor 2 are stopped, the air pressure in the negative pressure box 1 is slowly restored, and the electrode is taken out for subsequent pore structure detection (i.e., gas adsorption isotherm determination).

[0045] By rotating the motor 2 to drive the trigger rod 33 and the resistance column 34 to periodically touch each other, the electrode is caused to swing up and down regularly, breaking the adsorption balance of the gas-solid interface during static degassing, accelerating the stripping and diffusion of moisture and impurities in the pores. Compared with traditional static degassing, the degassing time is significantly shortened and the detection efficiency is improved.

[0046] Mechanical shaking has a good disturbance effect on the macropores between the fibers of the gas diffusion layer (carbon paper / carbon cloth) and the micropores of the catalyst layer. It is particularly suitable for removing liquid water remaining after the operation of the fuel cell, avoiding water retention that affects the accuracy of subsequent porosity measurements.

[0047] The degassing temperature is strictly controlled at 80-150°C, which is lower than the decomposition temperature of Nafion binder (>200°C) and the oxidation temperature of carbon materials. Combined with the low-amplitude design of mechanical shaking, it avoids damage to the electrode structure (catalyst layer shedding, binder aging) caused by traditional high temperature or severe vibration, ensuring that the physical and chemical properties of the electrode are not damaged after degassing.

[0048] The negative pressure environment reduces the gas partial pressure, heating provides vaporization energy, and mechanical shaking promotes surface renewal. The synergistic effect of the three makes the degassing rate of each area of the electrode consistent, solving the problem of uneven degassing caused by sample stacking or local uneven heating in traditional methods, and providing more reliable initial conditions for subsequent gas adsorption measurements.

[0049] The mechanical linkage design of the built-in lifting slot of the rotating shaft 21 and the trigger rod 33 can realize the shaking function without an additional power source, with a compact structure and high reliability;

[0050] The heating device 4 is integrated with the negative pressure box 1, supporting the coordinated control of parameters such as temperature, vacuum degree, and shaking frequency, and adapting to the degassing requirements of different types of electrode materials (gas diffusion layer including PTFE hydrophobic layer).

[0051] One end of the connecting shaft 32 is fixedly connected to the top surface of the lifting block 31, and the other end of the connecting shaft 32 is fixedly connected to the bottom surface of the fixed net 22;

[0052] Connecting shaft 32 directly connects lifting block 31 to the bottom surface of fixed mesh 22, allowing the bottom surface of fixed mesh 22 to remain completely suspended during rotation, eliminating the contact and obstruction between the bottom surface and rotating shaft 21 or bracket in traditional fixing methods. The bottom surface of the electrode sample (sandwiched between fixed mesh 22 and transfer mesh 23) is directly exposed to the flowing air within negative pressure chamber 1, increasing the pore contact area. This allows for seamless degassing of the fiber pores on the bottom surface of the gas diffusion layer (carbon paper / carbon cloth), preventing localized moisture retention caused by obstruction caused by the fixed structure.

[0053] The top surface of the abutment column 34 is rotatably connected to a ball bearing 35. The abutment column 34 has six locations arranged in a circular array with the axis of the rotating shaft 21 as the center. Trigger rods 33 are provided on both sides of the top surface of the lifting block 31.

[0054] The ball 35 on the top surface of the abutment column 34 converts the sliding friction of the trigger rod 33 into rolling friction, reducing the friction coefficient, avoiding component wear caused by traditional rigid contact (wear of the end surface of the trigger rod 33 or deformation of the abutment column 34), and extending the life of the equipment.

[0055] The six groups of friction pillars 34 are distributed in a circular array, so that for every rotation of the rotating shaft 21, the trigger rod 33 touches the friction pillars 34 six times (the original design was once), the vibration frequency is increased, and the electrode shaking frequency is positively correlated with the degassing efficiency, especially for the adsorbed water and sticky impurities (residual adhesive solvent) in the micropores. It has a stronger stripping effect, and the degassing time is further shortened.

[0056] Trigger rods 33 are set on both sides of the lifting block 31, so that the thrust of the resistance column 34 is changed from a single-point force to a symmetrical two-point force, the stress concentration coefficient is reduced, and the eccentric wear of the rotating shaft 21 or the scratching of the inner wall of the lifting groove 3 due to long-term unilateral force is avoided, thereby improving the stability and reliability of the mechanical structure and ensuring that the equipment can operate without trouble for a long time under high-frequency vibration.

[0057] The bottom surface of the lifting slot 3 is provided with a notch, in which one end of a spring 5 is fixedly installed. The lifting block 31 is hollowed out, and the other end of the spring 5 is fixedly connected to the bottom surface of the lifting block 31 .

[0058] The spring 5 at the bottom of the lifting groove 3 provides elastic support for the lifting block 31. When the trigger rod 33 contacts the ball 35 of the resistance column 34, the spring 5 compresses to absorb the impact energy, thus avoiding noise and component damage caused by rigid collision.

[0059] After disengagement, the restoring force of the spring 5 ensures that the lifting block 31 falls back smoothly, and the vibration amplitude error is controlled within ±0.5mm to prevent uneven shaking of the electrode due to amplitude fluctuations (severe shaking on one side and no shaking on the other side).

[0060] The stiffness of spring 5 matches the weight of the electrode (springs 5 with different elastic coefficients can be selected according to sample specifications), providing gentle shaking for lightweight electrodes (thin gas diffusion layers) and sufficient driving force for heavy electrodes (multi-layer composite membrane electrodes).

[0061] The hollow design of the lifting block 31 reduces the weight of the component, reduces the load on the rotating motor 2, and reduces energy consumption; at the same time, the lightweight structure combined with the elasticity of the spring 5 improves the response speed (rise / fall time) of the lifting block 31, ensures the continuity of movement under high-frequency vibration, and avoids vibration lag or jamming caused by large component inertia.

[0062] The fixed net 22 and the transfer net 23 are regular hexagonal nets. One end of the fixed net 22 and the transfer net 23 is provided with a matching hinge, and the other end of the fixed net 22 and the transfer net 23 is provided with a connecting port 24 and a docking buckle 25.

[0063] The geometric structure of the regular hexagonal mesh has symmetrical and uniform stress characteristics. The angles of each side and the mesh holes are consistent (120°), so that the surface force of the electrode is evenly distributed when clamped, avoiding wrinkles or damage to the electrode edges caused by stress concentration at the corners of traditional square mesh (especially for ultra-thin proton exchange membranes or brittle catalyst layers).

[0064] The mesh has a regular shape and consistent aperture, ensuring that the airflow (or heated air) in the negative pressure box 1 penetrates the electrode surface evenly. There is no blind spot during the degassing process, and the air contact efficiency is increased by 20% compared to the traditional square mesh.

[0065] A hinge at one end enables 180° free opening and closing. The fixed net 22 and the transfer net 23 can be quickly opened without tools (similar to turning pages of a book). The electrode placement time is shortened from 2 minutes with traditional screw fixation to less than 10 seconds, meeting the high-frequency storage and retrieval needs of batch samples in industrial testing.

[0066] The connecting port 24 at the other end and the docking buckle 25 adopt a snap-on design, which can be locked by turning it back, and there is no jamming when unlocking.

[0067] A control sleeve 41 is provided at the center of the top surface of the switching network 23. The inner top and inner bottom surfaces of the control sleeve 41 are provided with a linear switch 43 and one end of an air bag 42 respectively.

[0068] A thermal pad 44 is provided between the air bag 42 and the switching network 23 , and the thermal pad 44 is made of copper.

[0069] The thermal pad 44 (copper) quickly conducts the heat of the heating device 4 to the airbag 42 (made of high-temperature expansion material, such as polyimide foam). The airbag 42 expands linearly with the increase of temperature (expansion coefficient 0.01-0.03 mm / °C).

[0070] When the temperature exceeds the preset upper limit (i.e. 150°C), the airbag 42 expands until it touches the linear switch 43, triggering a signal to be fed back to the control system of the heating device 4, automatically reducing the heating power; when the temperature is lower than the lower limit (such as 80°C), the airbag 42 contracts and disengages from the switch, and the heating device 4 resumes high-power operation, forming a closed-loop control of "heating, expansion, feedback, and regulation". No additional temperature sensor is required, which simplifies the circuit design and controls the temperature fluctuation within ±2°C.

[0071] The super thermal conductivity of copper (thermal conductivity coefficient 401W / (m·K)) shortens the response time of the airbag 42 to temperature changes to 5 seconds, quickly suppressing temperature overshoot and preventing the electrode from being damaged by instantaneous high temperature.

[0072] The adaptive adjustment enables the heating device 4 to automatically enter the "keeping warm mode" after reaching the target temperature, and the energy consumption is reduced compared with the traditional constant power heating.

[0073] In view of the decomposition temperature of Nafion binder in proton exchange membrane electrodes (>200℃) and the oxidation temperature of carbon-based materials (>180℃), the temperature control system forcibly locks the temperature at 80-150℃ to prevent material failure (binder carbonization, carbon paper embrittlement) caused by temperature control failure.

[0074] For multi-layer composite electrodes (MEA components), the elastic deformation of the airbag 42 can compensate for the thermal expansion differences of the materials of each layer (difference in expansion coefficient between the proton exchange membrane and the catalyst layer), thereby preventing interlayer peeling caused by thermal stress.

[0075] The "thermal and mechanical" conversion characteristics of the airbag 42 are used to replace traditional temperature sensors (thermocouples, RTDs), reducing the failure points of electronic components (sensor failures account for more than 30% of equipment maintenance problems), while avoiding the interference of sensor wiring on the vacuum environment in the negative pressure box 1 (air leakage due to wire pores).

[0076] The linear switch 43 and the airbag 42 are integrated into the control sleeve 41 to form a modular component. The replacement and maintenance costs are lower than those of traditional temperature control systems (only the airbag 42 module needs to be replaced, and the entire system does not need to be disassembled).

[0077] By adjusting the expansion threshold of the airbag 42 material (replacing the expansion foam with a different formula), the temperature requirements of different electrode materials can be adapted (when the high-temperature electrode needs to be controlled at 120-200°C, only the airbag 42 material needs to be replaced, and the hardware structure does not need to be changed).

[0078] The high thermal conductivity of the copper thermal pad 44 makes it suitable for a variety of heating methods (resistance heating, infrared heating), compatible with the upgrade and transformation of existing equipment, and especially suitable for the intelligent transformation of old detection equipment (no need to replace the heating device 4, only add the control sleeve 41 component to achieve temperature control upgrade).

[0079] The four corners of the bottom surface of the negative pressure box 1 are provided with a pad column 13. The height of the pad column 13 is higher than that of the rotating motor 2. The bottom surface of the pad column 13 is provided with a rubber pad.

[0080] A sealed door 11 is hinged on the front of the negative pressure box 1, and a rubber sealing strip adapted to the front of the negative pressure box 1 is provided on the inner side of the sealed door 11. The sealed door 11 is composed of an outer insulation frame and an inner observation window. A handrail 12 is fixedly connected to the front of the sealed door 11.

[0081] The height of the raising column 13 is higher than the rotating motor 2 (e.g., 5-10 mm), so that an air circulation channel is formed between the bottom of the motor and the placement plane, the heat dissipation efficiency is improved, and the speed attenuation or life shortening caused by long-term high-temperature operation of the motor is avoided.

[0082] The bottom rubber pad (thickness 3-5mm, Shore hardness 60-70A) provides anti-slip and shock absorption functions, which reduces the vibration transmission rate and reduces the interference of vibration on the precision components near the negative pressure box (gas adsorption instrument sensor, etc.), ensuring the stability of pressure and temperature data collection during the degassing process.

[0083] The flexible contact of the rubber pad can adapt to floors of different flatness (laboratory tiles, factory cement floors, etc.), avoiding eccentric wear of the rotating shaft 21 caused by uneven floors.

[0084] The rubber material is oil-resistant and aging-resistant (nitrile rubber), which prevents the equipment from scratching the ground when moving, and prevents ground oil from seeping into the bottom of the pad column 13, maintaining the cleanliness of the equipment (especially suitable for the dusty and oily environment of the fuel cell production workshop).

[0085] The inner rubber sealing strip (made of high temperature resistant silicone rubber, hardness 70±5A) is precisely matched with the groove on the front of the negative pressure box 1, and cooperates with the locking structure of the sealing door 11 (implicit design, the existing technology will not be described in detail), so that the vacuum degree in the box is stably maintained at ≤10 during the degassing process. -3 mbar (leakage rate ≤ 5×10 -5 mbar·L / s), ensuring that the negative pressure environment does not affect the promotion of water vaporization.

[0086] The heat insulation frame (made of polyurethane foam, with a thermal conductivity of ≤0.025W / (m·K)) blocks heat conduction inside and outside the box, so that the temperature difference between the surface temperature of the sealed door 11 and the room temperature is ≤5°C (the temperature difference of a traditional metal door can reach more than 20°C), avoiding accidental contact and burns for operators, while reducing heat loss in the box (reducing the energy consumption of the heating device 4).

[0087] The observation window is made of double-layer tempered glass (with low-emissivity film on the inner layer) with a light transmittance of ≥90%. The electrode shaking state and the working conditions of the heating device 4 (temperature indicator light, sample color change) can be clearly observed. The degassing progress can be judged without frequent unpacking, avoiding vacuum fluctuations caused by unpacking.

[0088] The armrest 12 provides a comfortable force point. Even under negative pressure in the box, a single person can easily open and close the sealed door 11. It is especially suitable for industrial inspection scenarios with frequent loading and unloading.

Claims

1. A proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device, comprising a negative pressure box (1) and a fully automatic gas adsorption instrument, characterized in that: The bottom surface of the negative pressure box (1) is provided with a rotating motor (2), the output shaft of the rotating motor (2) is fixedly connected to a rotating shaft (21), the top surface of the rotating shaft (21) is connected to a fixed net (22), one end of the fixed net (22) is rotatably connected to a switching net (23), and the other end of the switching net (23) is clamped with the fixed net (22); A lifting slot (3) is provided in the rotating shaft (21), a lifting block (31) is slidably connected in the lifting slot (3), a trigger rod (33) is fixedly connected to the top surface of the lifting block (31), a resistance column (34) is fixedly connected to the inner bottom surface of the negative pressure box (1), and a rotation path of the trigger rod (33) overlaps with the resistance column (34); A heating device (4) is installed on the top surface of the negative pressure box (1).

2. The proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device according to claim 1, characterized in that: One end of a connecting shaft (32) is fixedly connected to the top surface of the lifting block (31), and the other end of the connecting shaft (32) is fixedly connected to the bottom surface of the fixed net (22).

3. The proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device according to claim 2, characterized in that: The top surface of the abutment column (34) is rotatably connected to a ball (35). The abutment column (34) has six locations arranged in a circular array with the axis of the rotating shaft (21) as the center of the circle and at equal intervals. Trigger rods (33) are provided on both sides of the top surface of the lifting block (31).

4. The proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device according to claim 3, characterized in that: The bottom surface of the lifting slot (3) is provided with a notch, one end of a spring (5) is fixedly installed in the notch, the lifting block (31) is hollowed out, and the other end of the spring (5) is fixedly connected to the bottom surface of the lifting block (31).

5. The proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device according to claim 4, characterized in that: The fixed net (22) and the transfer net (23) are regular hexagonal nets. One end of the fixed net (22) and the transfer net (23) is provided with a matching hinge, and the other end of the fixed net (22) and the transfer net (23) is provided with a connecting port (24) and a docking buckle (25).

6. The proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device according to claim 5, characterized in that: The four corners of the bottom surface of the negative pressure box (1) are all provided with raising columns (13), the height of the raising columns (13) is higher than that of the rotating motor (2), and the bottom surface of the raising columns (13) is provided with a rubber pad.

7. The proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device according to claim 6, characterized in that: A control sleeve (41) is provided at the center of the top surface of the switching network (23), and a linear switch (43) and one end of an air bag (42) are respectively provided on the inner top and inner bottom surfaces of the control sleeve (41).

8. The proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device according to claim 7, characterized in that: A heat-conducting pad (44) is provided between the air bag (42) and the switching network (23), and the heat-conducting pad (44) is made of copper.

9. The proton exchange membrane electrolysis water hydrogen production membrane electrode defect detection device according to claim 8, characterized in that: The front of the negative pressure box (1) is hinged with a sealing door (11), the inner side of the sealing door (11) is provided with a rubber sealing strip adapted to the front of the negative pressure box (1), the sealing door (11) is composed of an outer heat insulation frame and an inner observation window, and the front of the sealing door (11) is fixedly connected with a handrail (12).

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