CN115343331A - Efficient membrane electrode defect detection device - Google Patents
Efficient membrane electrode defect detection device Download PDFInfo
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- CN115343331A CN115343331A CN202210967075.1A CN202210967075A CN115343331A CN 115343331 A CN115343331 A CN 115343331A CN 202210967075 A CN202210967075 A CN 202210967075A CN 115343331 A CN115343331 A CN 115343331A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0066—Radiation pyrometry, e.g. infrared or optical thermometry for hot spots detection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
- G01J5/485—Temperature profile
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention discloses a high-efficiency membrane electrode defect detection device, which adopts the technical scheme that: the device comprises a protective cover, wherein a detection mechanism is arranged in the protective cover; detection mechanism is including connecting the shell, and connecting the shell is fixed to be located protection casing one side, and connecting shell has inside offered the connection spout, connects the inside link block that is equipped with of spout, and the link block both sides are all fixed and are equipped with a plurality of slip subassemblies, and the slip subassembly includes two connection curb plates, and two connection curb plates all with link block fixed connection, are connected with the pulley through the bearing between two connection curb plates, and beneficial effect is: by observing the local hot spot distribution, whether the membrane electrode has defects (membrane perforation, uneven thickness, uneven catalyst layer, air holes, cracks, degradation of a gas diffusion layer and the like) is judged at any time, the defects are confirmed to be fast and easy to observe by matching with an optical radiation target, the time is saved, the membrane electrode can operate under different operation environment settings, the defect forming time is observed and determined at any time, and the defect forming process is convenient to analyze.
Description
Technical Field
The invention relates to the technical field of membrane electrode detection, in particular to a high-efficiency membrane electrode defect detection device.
Background
A fuel cell is a device that can convert chemical energy of hydrogen and oxygen into electric energy, and is mainly characterized by including: environmental protection, high efficiency, large energy density, high output power, wide application range and the like. The main components of the fuel cell comprise an end plate, a flow field plate, a current collecting plate and a membrane electrode. The membrane electrode is a place where electrochemical reaction occurs, and comprises components such as a proton exchange membrane, a catalytic layer, a gas diffusion layer and the like.
The existing online diagnosis is installed at the rear end of production equipment, the sample in the factory production process is evaluated for a plurality of times, the damage of a membrane electrode can not be detected in real time in the operation process, the online detection process is used for detecting the tiny defect, the amplification factor of a detecting instrument is required to be high, the rapid and accurate detection is required, the investment cost is high, the detection time is long, a large amount of manpower and time cost are consumed, the production efficiency is low, the manual detection resolution is low, the missing detection is easy to occur, the false detection and other conditions occur, the membrane electrode is detached from the inside of a fuel cell after operation, the shooting is carried out after the detachment is needed, however, the damage of the membrane electrode in the detachment process can not be judged by the later analysis.
Disclosure of Invention
Therefore, the invention provides an efficient membrane electrode defect detection device, aiming at the following problems: the performance of product is carried out to the sample that the factory production obtained and is carried out the product and property aassessment, the membrane electrode damage appears in the unable real-time check operation in-process, on-line testing process, when detecting small defect, require detecting instrument magnification, and quick accurate detection, the input cost is big and the check-out time is long, consume a large amount of manpowers and time cost, production efficiency is low, and artifical detection resolution is low, the easy hourglass is examined and appears, the emergence of condition such as false retrieval, the membrane electrode is after the operation, demolish membrane electrode from fuel cell inside, it shoots after needing to dismantle more, however dismantle in-process membrane electrode fragile leads to the unable defect formation reason of judging of later stage analysis.
In order to solve the above problems, the present invention provides the following technical solutions: the high-efficiency membrane electrode defect detection device comprises a protective cover, wherein a detection mechanism is arranged inside the protective cover;
the detection mechanism comprises a connecting shell, the connecting shell is fixedly arranged on one side of the protective cover, a connecting chute is formed in the connecting shell, a connecting sliding block is arranged in the connecting chute, a plurality of sliding assemblies are fixedly arranged on two sides of the connecting sliding block, each sliding assembly comprises two connecting side plates, the two connecting side plates are fixedly connected with the connecting sliding block, the two connecting side plates are connected with pulleys through bearings, the pulleys are in contact with the side walls of the connecting chute, a fixing plate is fixedly connected to the top of the connecting sliding block, a bottom end plate is fixedly connected to the top of the fixing plate, a bottom flow field plate and a bottom flow collecting plate are embedded in the bottom end plate respectively, the bottom flow field plate is arranged at the bottom of the bottom flow field plate, a frame plate is arranged at the top of the bottom end plate, the bottom end plate and the frame plate are fixed through bolts, a membrane electrode body is arranged in the frame plate, through holes are formed in two sides of the top of the frame plate, and a sealing cover assembly is arranged at the top of the frame plate.
Preferably, the closing cap subassembly includes the top end plate, the frame board top is located to the top end plate, top end plate both sides all are equipped with spacing unit, spacing unit is including the fluting, the fluting is seted up inside the top end plate, the inside first side groove that has seted up of fluting, the inside first top slider that is equipped with of first side groove, first side groove and first top slider sliding connection, first top slider bottom fixedly connected with first pinion rack, first pinion rack bottom fixedly connected with fixed pin, fixed pin one end extends the top end plate bottom, fixed pin one end extends into inside the through-hole, first pinion rack one side is equipped with the connecting axle, the connecting axle both ends are connected through the bearing with the fluting lateral wall, the fixed cover of connecting axle outside is equipped with the membrane electrode, the gear meshes with first pinion rack mutually, gear one side meshing is connected with the second pinion rack, second pinion rack one end extends the top end plate outside, second pinion rack bottom fixedly connected with seals up the pad, sealed pad contacts with the membrane electrode body.
Preferably, a second top slider is fixedly connected to one side of the second toothed plate, a second side groove is formed in one side of the groove, the second top slider extends into the interior of the second side groove and is in sliding connection with the second side groove, a telescopic rod is fixedly connected to the bottom of the second top slider, a spring is sleeved on the outer portion of the telescopic rod, and the bottom of the telescopic rod is fixedly connected with the bottom of the groove.
Preferably, the fixed slide rail that is equipped with in link block bottom, the inside slide rail slider that is equipped with of slide rail, slide rail and slide rail slider sliding connection, slide rail slider one side is connected with the fixed axle through the bearing, fixed axle one end is connected with the driving plate through the bearing, driving plate one side fixedly connected with transmission shaft, the transmission shaft runs through the protection casing bottom and is connected through the bearing with the protection casing bottom, the fixed second motor that is equipped with in protection casing bottom, second motor output and transmission shaft fixed connection.
Preferably, the bottom of the connecting shell is fixedly connected with a supporting plate, and the supporting plate is fixedly connected with the protective cover.
Preferably, the spout has been seted up to protection casing one side, protection casing one side is the first even board of fixedly connected with and the second even board respectively, first board one side is connected with the lead screw through the bearing, the lead screw other end runs through the second even board and is connected through the bearing with the second even board, the second is even fixed third motor that is equipped with in board one side, third motor output and lead screw fixed connection, the outside cover of lead screw is equipped with the slider, the lead screw passes through threaded connection with the slider, the slider locate inside and with spout sliding connection of spout, slider one side fixedly connected with link, the first motor of link top fixedly connected with, the link is inside to be connected with the threaded rod through the bearing, first motor output and threaded rod fixed connection, the threaded rod outside is equipped with the screw block through the thread bush, two gag lever posts of the inside fixedly connected with of link, two gag lever posts run through the screw block and with screw block sliding connection, screw block one side fixedly connected with connecting plate, connecting plate and top end plate fixed connection. The top end plate is manufactured by integrally forming the flow collecting plate and the flow field plate on the top.
Preferably, four corners of the bottom of the protective cover are fixedly connected with supporting legs.
Preferably, a radiation light source and a CCD high-speed camera assembly are fixedly arranged inside the protective cover.
Preferably, the top of the flow field plate and the bottom of the open flow field plate are both fixedly provided with two air charging holes.
The embodiment of the invention has the following advantages:
1. move up and drive gear revolve through first pinion rack, gear revolve and drive the second pinion rack and move down, the second top slider of second pinion rack one side slides in second side inslot simultaneously, make the spring and the telescopic link compression of second top slider bottom, the second pinion rack moves down and drives sealed the pad and move down, make sealed pad compress tightly membrane electrode body, avoid membrane electrode body to take place the displacement in the testing process, design fuel cell anchor clamps to open, after the top end plate is putd aside, whether the membrane electrode produces the defect conveniently to observe at any time, cooperation light radiation target confirms fast, easy observation, time saving.
2. By removing the top end plate, the membrane electrode body after reaction is exposed at the bottom of the radiation light source and the CCD high-speed camera integration, the distribution condition of hot spots can be seen through the radiation light source and the CCD high-speed camera integration, the defect detection of the membrane electrode body is convenient, the state of the membrane electrode can be observed at any time, the defect forming process is convenient to analyze, and meanwhile, the top end plate is movable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary and that other implementation drawings may be derived from the provided drawings by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic view of the overall structure provided by the present invention;
FIG. 2 is a front view provided by the present invention;
FIG. 3 is a cross-sectional view of the overall structure provided by the present invention;
FIG. 4 is a perspective view of a coupling housing provided in accordance with the present invention;
FIG. 5 is an exploded view of a component of the detection mechanism provided by the present invention;
FIG. 6 is a cross-sectional view of a sensing mechanism provided by the present invention;
FIG. 7 is an enlarged view of the portion A of FIG. 3 according to the present invention;
FIG. 8 is an enlarged view of the portion B of FIG. 6 according to the present invention;
fig. 9 is a schematic view of the invention with the top endplate removed.
In the figure: 1. a protective cover; 2. integrating a radiation light source and a CCD high-speed camera; 3. a top end plate; 4. a connecting plate; 5. a frame plate; 6. a bottom end plate; 7. a connecting shell; 8. a support plate; 9. supporting legs; 10. a slide rail; 11. a first motor; 12. a connecting frame; 13. a slider; 14. a chute; 15. a screw rod; 16. a first connecting plate; 17. a second motor; 18. a drive shaft; 19. a drive plate; 20. a thread block; 21. a fixing plate; 22. connecting the side plates; 23. a pulley; 24. a slide rail slider; 25. connecting the sliding block; 26. connecting the sliding chute; 27. a fixed shaft; 28. a membrane electrode body; 29. a bottom flow field plate; 30. a bottom collector plate; 31. a second connecting plate; 32. a third motor; 33. a first top slider; 34. a first side groove; 35. a connecting shaft; 36. a gear; 37. a first toothed plate; 38. a through hole; 39. a fixing pin; 40. grooving; 41. a second side groove; 42. a second top slider; 43. a spring; 44. a telescopic rod; 45. a second toothed plate; 46. a gasket; 47. a limiting rod; 48. a threaded rod.
Detailed Description
The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-9, the present invention provides a high-efficiency membrane electrode defect detecting apparatus, which includes a protective cover 1, wherein a detecting mechanism is arranged inside the protective cover 1;
the detection mechanism comprises a connecting shell 7, the connecting shell 7 is fixedly arranged on one side of a protective cover 1, a connecting sliding groove 26 is formed in the connecting shell 7, a connecting sliding block 25 is arranged in the connecting sliding groove 26, a plurality of sliding assemblies are fixedly arranged on two sides of the connecting sliding block 25, each sliding assembly comprises two connecting side plates 22, two connecting side plates 22 are fixedly connected with the connecting sliding block 25, a pulley 23 is connected between the two connecting side plates 22 through a bearing, the pulley 23 is in contact with the side wall of the connecting sliding groove 26, a fixed plate 21 is fixedly connected to the top of the connecting sliding block 25, a bottom end plate 6 is fixedly connected to the top of the fixed plate 21, a bottom flow field plate 29 and a bottom flow field plate 30 are respectively embedded in the bottom end plate 6, the bottom flow field plate 30 is arranged at the bottom of the bottom 29, a frame plate 5 is arranged at the top of the bottom end plate 6, the bottom end plate 6 and the side frame plate 5 are fixed through bolts, a membrane electrode body 28 is arranged in the side frame plate 5, through holes 38 are formed in two sides of the top of the side frame plate 5, a sealing cover assembly is fixedly arranged at the top of the side plate, a sliding block 10 is connected with a sliding shaft 19, and a sliding shaft 18 is connected with a motor, and a second sliding shaft 18 is connected with a motor, the protective cover 17, short circuit is prevented;
in this embodiment, the second motor 17 is started and drives the transmission shaft 18 to rotate, the transmission shaft 18 rotates and drives the transmission plate 19 to rotate, the transmission plate 19 rotates and drives the fixed shaft 27 to rotate, the fixed shaft 27 rotates and drives the slide rail slider 24 to rotate, so that the slide rail slider 24 slides in the slide rail 10, so that the slide rail slider 24 drives the slide rail 10 to move, the slide rail 10 moves and drives the connecting slider 25 to move, so that the pulleys 23 on the sliding components at two sides of the connecting slider 25 slide in the connecting sliding grooves 26, and at the same time, the connecting slider 25 drives the fixed plate 21 to move, the fixed plate 21 drives the bottom end plate 6 to move, so that the frame plate 5 mounted with the bottom end plate 6 moves together, and the frame plate 5 moves close to the outermost portion of the protective cover 1 through the movement of the frame plate 5, so that the membrane electrode body 28 can be conveniently placed into the frame plate 5, and the frame plate 5 can retract into the protective cover 1 along with the start of the second motor 17.
Wherein, in order to realize spacing fixed purpose, this device adopts following technical scheme to realize: the sealing cover assembly comprises a top end plate 3, the top end plate 3 is arranged at the top of a frame plate 5, the top end plate 3 is manufactured by integrally forming a flow collecting plate and a flow field plate on one side of the top, limiting units are arranged on two sides of the top end plate 3 and comprise grooves 40, the grooves 40 are formed in the top end plate 3, first side grooves 34 are formed in the grooves 40, first top sliding blocks 33 are arranged in the first side grooves 34, the first side grooves 34 are in sliding connection with the first top sliding blocks 33, first toothed plates 37 are fixedly connected to the bottoms of the first top sliding blocks 33, fixing pins 39 are fixedly connected to the bottoms of the first toothed plates 37, one ends of the fixing pins 39 extend out of the bottom of the top end plate 3, one ends of the fixing pins 39 extend into through holes 38, and connecting shafts 35 are arranged on one sides of the first toothed plates 37, the two ends of the connecting shaft 35 are connected with the side walls of the open groove 40 through bearings, a gear 36 is fixedly sleeved outside the connecting shaft 35, the gear 36 is meshed with the first toothed plate 37, one side of the gear 36 is meshed with a second toothed plate 45, one end of the second toothed plate 45 extends out of the top end plate 3, a sealing gasket 46 is fixedly connected to the bottom of the second toothed plate 45, the sealing gasket 46 is in contact with the membrane electrode body 28, a second top slider 42 is fixedly connected to one side of the second toothed plate 45, a second side groove 41 is formed in one side of the open groove 40, the second top slider 42 extends into the second side groove 41 and is in sliding connection with the second side groove 41, a telescopic rod 44 is fixedly connected to the bottom of the second top slider 42, a spring 43 is sleeved outside the telescopic rod 44, the bottom of the telescopic rod 44 is fixedly connected to the bottom of the open groove 40, and when the top end plate 3 covers the frame plate 5, the fixing pin 39 at the bottom of the top end plate 3 enters the through hole 38 at the top of the frame plate 5, meanwhile, the fixing pin 39 moves upwards and drives the first toothed plate 37 to move upwards, the first top slider 33 at one side of the first toothed plate 37 slides in the first side groove 34, the first toothed plate 37 moves upwards and drives the gear 36 to rotate, the gear 36 rotates and drives the second toothed plate 45 to move downwards, meanwhile, the second top slider 42 at one side of the second toothed plate 45 slides in the second side groove 41, so that the spring 43 and the telescopic rod 44 at the bottom of the second top slider 42 are compressed, the second toothed plate 45 moves downwards and drives the sealing gasket 46 to move downwards, and the sealing gasket 46 is enabled to compress the membrane electrode body 28.
Wherein, in order to realize the purpose of supporting, this device adopts following technical scheme to realize: the bottom of the connecting shell 7 is fixedly connected with a supporting plate 8, the supporting plate 8 is fixedly connected with the protective cover 1, and the supporting plate 8 has a supporting function;
wherein, in order to realize the purpose of moving, this device adopts the following technical scheme to realize: one side of the protective cover 1 is provided with a chute 14, one side of the protective cover 1 is fixedly connected with a first connecting plate 16 and a second connecting plate 31 respectively, one side of the first connecting plate 16 is connected with a screw rod 15 through a bearing, the other end of the screw rod 15 penetrates through the second connecting plate 31 and is connected with the second connecting plate 31 through a bearing, a third motor 32 is fixedly arranged on one side of the second connecting plate 31, the output end of the third motor 32 is fixedly connected with the screw rod 15, the outer part of the screw rod 15 is sleeved with a slide block 13, the screw rod 15 is connected with the slide block 13 through threads, the sliding block 13 is arranged inside the sliding groove 14 and is connected with the sliding groove 14 in a sliding way, one side of the sliding block 13 is fixedly connected with a connecting frame 12, the top of the connecting frame 12 is fixedly connected with a first motor 11, the inside of the connecting frame 12 is connected with a threaded rod 48 through a bearing, the output end of the first motor 11 is fixedly connected with a threaded rod 48, a threaded block 20 is sleeved outside the threaded rod 48 through threads, two limiting rods 47 are fixedly connected inside the connecting frame 12, the two limiting rods 47 penetrate through the thread block 20 and are connected with the thread block 20 in a sliding manner, one side of the thread block 20 is fixedly connected with a connecting plate 4, the connecting plate 4 is fixedly connected with the top end plate 3, a third motor 32 is started, the third motor 32 is started and drives a screw rod 15 to rotate, the screw rod 15 rotates and drives a sliding block 13 to slide in a sliding groove 14, the sliding block 13 moves and drives a connecting frame 12 to move, meanwhile, the first motor 11 on the top of the connecting frame 12 is started and drives the threaded rod 48 to rotate, the threaded rod 48 rotates and drives the threaded block 20 to move, the threaded block 20 moves and drives the connecting plate 4 to move, so that the connecting plate 4 drives the top end plate 3 to move, thereby enabling the top end plate 3 to move back and forth and up and down so that the top end plate 3 covers and uncovers the bezel plates 5.
Wherein, in order to realize the purpose of propping up, this device adopts following technical scheme to realize: four corners of the bottom of the protective cover 1 are fixedly connected with supporting legs 9, and the supporting legs 9 have a supporting function;
wherein, in order to realize the purpose that detects, this device adopts the following technical scheme to realize: a radiation light source and a CCD high-speed camera assembly 2 are fixedly arranged in the protective cover 1, and the radiation light source and the CCD high-speed camera assembly 2 facilitate detection;
wherein, in order to realize the purpose of detecting and inflating, the device adopts the following technical scheme: the top end plate 3 and the bottom end plate 6 are both fixedly provided with two inflation holes, when the membrane electrode body 28 is placed, the top of the membrane electrode body 28 is a cathode, the bottom of the membrane electrode body 28 is an anode, air or oxygen is introduced through one inflation hole in the bottom of the top end plate 3, the top end plate 3 is formed by integrating a current collecting plate and an open flow field plate (the open flow field plate means that the top end plate 3 can be removed, namely the flow field plate on the top can be removed), so that the air or the oxygen is introduced through uniform distribution on the open flow field plate, meanwhile, hydrogen passes through one inflation hole in the bottom end plate 6, so that the hydrogen passes through the bottom current collecting plate 30, and the hydrogen is introduced through the bottom flow field plate 29 uniformly, and the bottom flow field plate 29, the bottom current collecting plate 30 and the bottom end plate 6 are wrapped by insulating materials to prevent short circuit; when hydrogen firstly contacts the membrane electrode body 28, when the membrane electrode body 28 has defects, the hydrogen passes through the defect position and contacts with air or oxygen on the other side, the contact position of the hydrogen and the air (oxygen) of the membrane electrode body 28 generates a chemical reaction to generate water (the membrane electrode contains a platinum carbon catalyst which catalyzes the hydrogen and the oxygen to generate water), the reaction site releases heat, the other inflation hole at the bottom of the bottom end plate 6 exhausts residual gas, after a period of operation, the hot spot distribution can be seen through the radiation light source and the CCD high-speed camera assembly 2 by removing the top end plate 3, the defect detection of the membrane electrode body 28 is convenient, meanwhile, the top end plate 3 can be directly removed to enable the top of the membrane electrode body 28 to be directly exposed in the air, the hydrogen passes through one inflation hole of the bottom end plate 6 and is uniformly introduced through the bottom flow field plate 29, so that after the hydrogen contacts with the membrane electrode body 28, the hydrogen passes through the defect position and contacts with the air on the other side, the reaction site releases heat, and the radiation light source and the CCD high-speed camera assembly 2 can directly see the hot spot distribution.
The using process of the invention is as follows: when the invention is used, the second motor 17 is started and drives the transmission shaft 18 to rotate, the transmission shaft 18 rotates and drives the transmission plate 19 to rotate, the transmission plate 19 rotates and drives the fixed shaft 27 to rotate, the fixed shaft 27 rotates and drives the slide rail slide block 24 to rotate, so that the slide rail slide block 24 slides in the slide rail 10, so that the slide rail slide block 24 drives the slide rail 10 to move, the slide rail 10 moves and drives the connecting slide block 25 to move, so that the pulleys 23 on the sliding components at two sides of the connecting slide block 25 slide in the connecting slide grooves 26, meanwhile, the connecting slide block 25 drives the fixed plate 21 to move, the fixed plate 21 drives the bottom end plate 6 to move, so that the frame plate 5 mounted with the bottom end plate 6 moves together, the frame plate 5 moves close to the outermost part of the protective cover 1 through the movement of the frame plate 5, the membrane electrode body 28 is conveniently placed in the frame plate 5, and the frame plate 5 retracts into the protective cover 1 along with the start of the second motor 17, simultaneously, the third motor 32 is started and drives the screw rod 15 to rotate, the screw rod 15 rotates and drives the sliding block 13 to slide in the sliding groove 14, the sliding block 13 moves and drives the connecting frame 12 to move, simultaneously, the first motor 11 at the top of the connecting frame 12 is started and drives the threaded rod 48 to rotate, the threaded rod 48 rotates and drives the threaded block 20 to move, the threaded block 20 moves and drives the connecting plate 4 to move, the connecting plate 4 drives the top end plate 3 to move, the top end plate 3 can move back and forth and up and down, the top end plate 3 covers the frame plate 5, when the top end plate 3 covers the frame plate 5, the fixing pin 39 at the bottom of the top end plate 3 enters the through hole 38 at the top of the frame plate 5, simultaneously, the fixing pin 39 moves upwards and drives the first toothed plate 37 to move upwards, the first top sliding block 33 at one side of the first toothed plate 37 slides in the first side groove 34, the first toothed plate 37 moves upwards and drives the gear 36 to rotate, the gear 36 rotates and drives the second toothed plate 45 to move downwards, meanwhile, the second top sliding block 42 on one side of the second toothed plate 45 slides in the second side groove 41, so that the spring 43 and the telescopic rod 44 at the bottom of the second top sliding block 42 are compressed, the second toothed plate 45 moves downwards and drives the sealing gasket 46 to move downwards, so that the sealing gasket 46 tightly presses the membrane electrode body 28, the membrane electrode body 28 is fixed and limited, the top end plate 3 and the frame plate are fixed and limited, when the membrane electrode body 28 is placed, the top of the membrane electrode body 28 is a cathode, the bottom of the membrane electrode body 28 is an anode, air or oxygen is introduced through one of the inflation holes at the bottom of the top end plate 3, the current collecting plate in the top end plate 3 is made into an integral with the opening, so that the air or oxygen is introduced through uniform distribution on the opening flow field plate, and hydrogen passes through one of the inflation holes in the bottom end plate 6, hydrogen is enabled to penetrate through the bottom collector plate 30, meanwhile, hydrogen is evenly introduced through the bottom flow field plate 29, air or oxygen and hydrogen are respectively contacted with the membrane electrode body 28 at two sides of the membrane electrode body 28, when the membrane electrode body 28 has defects after the hydrogen is contacted with the membrane electrode body 28, the hydrogen penetrates through the defect position and is contacted with the air or oxygen at the other side, the hydrogen air or oxygen contact position of the membrane electrode body 28 is subjected to chemical reaction under the action of a catalyst to generate water, the reaction site releases heat, the other inflation hole at the bottom of the bottom end plate 6 exhausts residual gas, after the operation is carried out for a period of time, the third motor 32 is started and drives the screw rod 15 to rotate, the screw rod 15 rotates and drives the sliding block 13 to slide in the sliding groove 14, the sliding block 13 moves and drives the connecting frame 12 to move, and simultaneously the first motor 11 at the top of the connecting frame 12 is started and drives the threaded rod 48 to rotate, the threaded rod 48 rotates and drives the threaded block 20 to move, the threaded block 20 moves and drives the connecting plate 4 to move, so that the connecting plate 4 drives the top end plate 3 to move, the top end plate 3 is removed, the membrane electrode body 28 after reaction is exposed at the bottom of the radiation light source and CCD high-speed camera assembly 2, the hot spot distribution condition can be seen through the radiation light source and CCD high-speed camera assembly 2, and the defect detection of the membrane electrode body 28 is facilitated;
in addition, the top end plate 3 and the integration therein can be directly removed, so that the top of the membrane electrode body 28 is directly exposed in air or oxygen, hydrogen passes through the bottom current collecting plate 30 by passing through one of the gas charging holes of the bottom end plate 6, and is uniformly distributed and introduced by the bottom current field plate 29, so that after the hydrogen contacts with the membrane electrode body 28, when the membrane electrode body 28 has a defect, the hydrogen passes through the defect position and contacts with the air or oxygen on the other side, so that the reaction site releases heat, and the distribution condition of hot spots can be directly seen by the radiation light source and the CCD high-speed camera assembly 2.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solution described above. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.
Claims (9)
1. An efficient membrane electrode defect detection device comprises a protective cover (1), and is characterized in that: a detection mechanism is arranged inside the protective cover (1);
the detection mechanism comprises a connecting shell (7), the connecting shell (7) is fixedly arranged on one side of the protective cover (1), a connecting sliding groove (26) is arranged in the connecting shell (7), a connecting sliding block (25) is arranged in the connecting sliding groove (26), a plurality of sliding assemblies are fixedly arranged on both sides of the connecting sliding block (25), each sliding assembly comprises two connecting side plates (22), the two connecting side plates (22) are fixedly connected with the connecting sliding block (25), a pulley (23) is connected between the two connecting side plates (22) through a bearing, the pulley (23) is contacted with the side wall of the connecting chute (26), the top of the connecting slide block (25) is fixedly connected with a fixed plate (21), the top of the fixed plate (21) is fixedly connected with a bottom end plate (6), a bottom flow field plate (29) and a bottom current collecting plate (30) are respectively embedded in the bottom end plate (6), the bottom flow collecting plate (30) is arranged at the bottom of the bottom flow field plate (29), the top of the bottom end plate (6) is provided with a frame plate (5), the bottom end plate (6) and the frame plate (5) are fixed by bolts, a membrane electrode body (28) is arranged in the frame plate (5), through-holes (38) are formed in the two sides of the top of the frame plate (5), and a sealing cover assembly is arranged on the top of the frame plate (5).
2. A highly efficient membrane electrode defect detecting device according to claim 1, wherein: the sealing cover assembly comprises a top end plate (3), the top end plate (3) is arranged at the top of a frame plate (5), limiting units are arranged on two sides of the top end plate (3), each limiting unit comprises a groove (40), the groove (40) is arranged inside the top end plate (3), a first side groove (34) is formed inside the groove (40), a first top sliding block (33) is arranged inside the first side groove (34), the first side groove (34) is connected with the first top sliding block (33) in a sliding manner, the first top sliding block (33) is fixedly connected with a first toothed plate (37) at the bottom, a fixed pin (39) is fixedly connected with the bottom of the first toothed plate (37), one end of the fixed pin (39) extends out of the bottom of the top end plate (3), one end of the fixed pin (39) extends into a through hole (38), one side of the first toothed plate (37) is provided with a connecting shaft (35), two ends of the connecting shaft (35) are connected with side walls of the groove (40) through bearings, a gear (35) is externally connected with a gear (36), one end plate (36), a second toothed plate (45) is meshed with a second toothed plate (45), and a second toothed plate (36) is arranged on one side of the second toothed plate (45), the seal gasket (46) is in contact with the membrane electrode body (28).
3. A highly efficient membrane electrode defect detecting device according to claim 2, wherein: second pinion rack (45) one side fixedly connected with second top slider (42), second side channel (41) have been seted up to fluting (40) one side, second top slider (42) extend into second side channel (41) inside and with second side channel (41) sliding connection, second top slider (42) bottom fixedly connected with telescopic link (44), outside cover of telescopic link (44) is equipped with spring (43), telescopic link (44) bottom and fluting (40) bottom fixed connection.
4. A highly efficient membrane electrode defect detecting device according to claim 1, wherein: connecting block (25) bottom is fixed and is equipped with slide rail (10), slide rail (10) inside is equipped with slide rail slider (24), slide rail (10) and slide rail slider (24) sliding connection, slide rail slider (24) one side is connected with fixed axle (27) through the bearing, fixed axle (27) one end is connected with driving plate (19) through the bearing, driving plate (19) one side fixedly connected with transmission shaft (18), transmission shaft (18) run through protection casing (1) bottom and are connected through the bearing with protection casing (1) bottom, protection casing (1) bottom is fixed and is equipped with second motor (17), second motor (17) output and transmission shaft (18) fixed connection.
5. A highly efficient membrane electrode defect detecting device according to claim 1, wherein: connect shell (7) bottom fixedly connected with backup pad (8), backup pad (8) and protection casing (1) fixed connection.
6. A highly efficient membrane electrode defect detecting device according to claim 1, wherein: the protection cover is characterized in that a sliding groove (14) is formed in one side of the protection cover (1), one side of the protection cover (1) is respectively fixedly connected with a first connecting plate (16) and a second connecting plate (31), one side of the first connecting plate (16) is connected with a lead screw (15) through a bearing, the other end of the lead screw (15) penetrates through the second connecting plate (31) and is connected with the second connecting plate (31) through a bearing, the second connecting plate (31) is fixedly provided with a third motor (32) in one side, an output end of the third motor (32) is fixedly connected with the lead screw (15), a sliding block (13) is sleeved outside the lead screw (15), the lead screw (15) is connected with the sliding block (13) through a thread, the sliding block (13) is arranged inside the sliding groove (14) and is connected with the sliding groove (14), a connecting frame (12) is fixedly connected with one side of the sliding block (13), a first motor (11) is fixedly connected with the top of the connecting frame (12), the connecting frame (12) is internally connected with a threaded rod (48) through a bearing, an output end of the first motor (11) is fixedly connected with a threaded rod (48) and is connected with a threaded rod (48), and two limiting blocks (20) are sleeved outside the threaded rod (47), one side of the thread block (20) is fixedly connected with a connecting plate (4), and the connecting plate (4) is fixedly connected with the top end plate (3).
7. A highly efficient membrane electrode defect detecting device according to claim 1, wherein: the protection casing (1) bottom four corners all fixedly connected with supporting leg (9).
8. A highly efficient membrane electrode defect detecting device according to claim 1, wherein: the protective cover (1) is internally and fixedly provided with a radiation light source and a CCD high-speed camera assembly (2).
9. A highly efficient membrane electrode defect detecting device according to claim 2, wherein: the top end plate (3) top and bottom end plate (6) bottom all fixedly are equipped with two and aerify the hole.
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| CN202210967075.1A CN115343331A (en) | 2022-08-11 | 2022-08-11 | Efficient membrane electrode defect detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116068024A (en) * | 2022-11-24 | 2023-05-05 | 中国石油大学(华东) | Membrane electrode on-line detection system applied to reel-to-reel production line |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040048113A1 (en) * | 2002-09-06 | 2004-03-11 | Murphy Michael W. | Method for detecting electrical defects in membrane electrode assemblies |
| RU66540U1 (en) * | 2007-05-14 | 2007-09-10 | Институт органической и физической химии им. А.Е. Арбузова Казанского научного центра РАН (ИОФХ им. А.Е. Арбузова КазНЦ РАН) | FUEL CELL FOR EPR |
| CA2691988A1 (en) * | 2007-07-09 | 2009-01-15 | Kabushiki Kaisha Atsumitec | Method and apparatus for examining ion-conductive electrolyte membrane |
| CN102486464A (en) * | 2010-12-02 | 2012-06-06 | 现代自动车株式会社 | System for detecting pin hole of fuel cell stack parts |
| CN202471354U (en) * | 2012-01-19 | 2012-10-03 | 武汉理工新能源有限公司 | Membrane electrode leak detection device utilizing infrared thermal imaging technology |
| DE102011050171A1 (en) * | 2011-05-06 | 2012-11-08 | Heinrich-Heine-Universität Düsseldorf | Method and arrangement for detecting a first gas in a gas mixture comprising at least one further gas |
| KR20160022027A (en) * | 2014-08-19 | 2016-02-29 | 현대자동차주식회사 | Membrane defect detection apparatus using hydrogen sensor array |
| KR20180070394A (en) * | 2016-12-16 | 2018-06-26 | 현대자동차주식회사 | Method and apparatus for detecting the defect of a fuel cell membrane-electrode assembly |
| US20190145913A1 (en) * | 2016-04-19 | 2019-05-16 | Toray Industries, Inc. | Method and device for continuous non-destructive inspection of membrane-electrode assembly |
| CN210347486U (en) * | 2019-07-17 | 2020-04-17 | 佛山市清极能源科技有限公司 | Online membrane electrode defect detection equipment |
| CN210572003U (en) * | 2019-07-17 | 2020-05-19 | 佛山市清极能源科技有限公司 | Quick screening equipment for membrane electrode defects |
| CN114100810A (en) * | 2021-11-06 | 2022-03-01 | 哈尔滨学院 | Sample crushing device for food safety inspection |
-
2022
- 2022-08-11 CN CN202210967075.1A patent/CN115343331A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040048113A1 (en) * | 2002-09-06 | 2004-03-11 | Murphy Michael W. | Method for detecting electrical defects in membrane electrode assemblies |
| CN1695071A (en) * | 2002-09-06 | 2005-11-09 | 通用汽车公司 | Method for detecting electrical defects in membrane electrode assemblies |
| RU66540U1 (en) * | 2007-05-14 | 2007-09-10 | Институт органической и физической химии им. А.Е. Арбузова Казанского научного центра РАН (ИОФХ им. А.Е. Арбузова КазНЦ РАН) | FUEL CELL FOR EPR |
| CA2691988A1 (en) * | 2007-07-09 | 2009-01-15 | Kabushiki Kaisha Atsumitec | Method and apparatus for examining ion-conductive electrolyte membrane |
| CN102486464A (en) * | 2010-12-02 | 2012-06-06 | 现代自动车株式会社 | System for detecting pin hole of fuel cell stack parts |
| DE102011050171A1 (en) * | 2011-05-06 | 2012-11-08 | Heinrich-Heine-Universität Düsseldorf | Method and arrangement for detecting a first gas in a gas mixture comprising at least one further gas |
| CN202471354U (en) * | 2012-01-19 | 2012-10-03 | 武汉理工新能源有限公司 | Membrane electrode leak detection device utilizing infrared thermal imaging technology |
| KR20160022027A (en) * | 2014-08-19 | 2016-02-29 | 현대자동차주식회사 | Membrane defect detection apparatus using hydrogen sensor array |
| US20190145913A1 (en) * | 2016-04-19 | 2019-05-16 | Toray Industries, Inc. | Method and device for continuous non-destructive inspection of membrane-electrode assembly |
| KR20180070394A (en) * | 2016-12-16 | 2018-06-26 | 현대자동차주식회사 | Method and apparatus for detecting the defect of a fuel cell membrane-electrode assembly |
| CN210347486U (en) * | 2019-07-17 | 2020-04-17 | 佛山市清极能源科技有限公司 | Online membrane electrode defect detection equipment |
| CN210572003U (en) * | 2019-07-17 | 2020-05-19 | 佛山市清极能源科技有限公司 | Quick screening equipment for membrane electrode defects |
| CN114100810A (en) * | 2021-11-06 | 2022-03-01 | 哈尔滨学院 | Sample crushing device for food safety inspection |
Non-Patent Citations (5)
| Title |
|---|
| 张宇峰等: "微型直接甲醇燃料电池的研究进展", 《北京工业大学学报》, vol. 44, no. 6, 24 April 2017 (2017-04-24), pages 801 - 811 * |
| 张梦迪等: "石墨烯作为硫载体在锂硫电池中的研究进展", 《物理化学学报》, vol. 38, no. 2, 10 February 2021 (2021-02-10), pages 55 - 67 * |
| 谢光有等: "催化层裂纹对燃料电池膜电极耐久性的影响研究", 《东方电气评论》, vol. 35, no. 1, 25 March 2021 (2021-03-25), pages 9 - 16 * |
| 谢声洛等: "《离子选择电极分析技术》", vol. 1, 31 December 1985, 化学工业出版社, pages: 54 - 58 * |
| 马永胜等: "播磨缺陷研究进展综述", 《表面技术》, vol. 50, no. 3, 20 March 2021 (2021-03-20), pages 91 - 100 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116068024A (en) * | 2022-11-24 | 2023-05-05 | 中国石油大学(华东) | Membrane electrode on-line detection system applied to reel-to-reel production line |
| CN116068024B (en) * | 2022-11-24 | 2023-07-07 | 中国石油大学(华东) | Membrane electrode on-line detection system applied to reel-to-reel production line |
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