Gas tightness detection mechanism for membrane electrode and gas tightness integrated machine using the same

Abstract

The utility model belongs to mechanical or structure part static balance test technical field, concretely relates to airtightness detection mechanism for membrane electrode and airtight integrated machine using it, include: hydraulic drive position, detection position, pull rod guide pillar, pressure head traction plate, main hydraulic cylinder, upper pressure head, lower pressure plate seat, lower pressure plate, track assembly, pressure head traction plate swing joint in pull rod guide pillar, upper pressure head is connected in the downside of pressure head traction plate. The utility model through setting in pressure head traction plate, will main hydraulic cylinder and upper pressure head change into indirect connection, will lower pressure plate and multiple lower pressure plate seat contact fit, and track assembly sets up between two lower pressure plate seats, can maximize increase lower pressure plate and lower pressure plate seat contact area, reduce the pressure intensity of lower pressure plate bottom, make it can adapt 5Mpa's high pressure airtightness test, through the way of upper pressure head and lower pressure plate cover pressure to membrane electrode fixed, through blowing gas and detecting air flow fluctuation to judge whether there is gas leakage and then acquire airtightness.

Description

Technical Field

[0001] This utility model belongs to the field of static balance testing technology for mechanical or structural components, specifically relating to the field of airtightness testing technology, and particularly to an airtightness testing mechanism for membrane electrodes and an integrated airtightness testing machine using the same. Background Technology

[0002] The membrane electrode assembly (MEA) is one of the most critical components of a hydrogen fuel cell. If it is not subjected to airtightness testing after production, it poses a safety risk, impacting the fuel cell's efficiency and lifespan, and rendering it unusable in a fuel cell stack. Therefore, airtightness testing is required before it can be removed from the production line.

[0003] The existing detection method for membrane electrodes is usually the differential pressure method. Specifically, test gas is first introduced into the cavity sealed between the pressure plate and the membrane electrode assembly to a preset pressure value. Then, after waiting for a certain period of time, the pressure change is detected, and the airtightness of the membrane electrode is judged based on the pressure change value.

[0004] Patent specification CN212409991U discloses a fuel cell membrane electrode assembly (MEA) airtightness testing device. In this design, the upper closing seat is directly connected to an upper closing cylinder and moves up and down in conjunction with a guide column, while the lower closing seat is directly connected to a lower closing seat horizontal drive mechanism. During airtightness testing, as the air pressure increases, higher air pressure is applied to the MEA assembly, simultaneously exerting a significant reaction force on the upper and lower closing seats of the airtightness testing device. The upper closing cylinder, directly connected to the upper closing seat, and the lower closing seat horizontal drive mechanism, connected to the lower closing seat, also bear substantial reaction forces. This leads to instability in the entire airtightness testing device, resulting in inaccurate measurement precision and unreliable results. This design is only suitable for detecting air pressures around 1 MPa under normal atmospheric pressure, making high-pressure airtightness testing impossible.

[0005] Therefore, it is urgent to modify the existing equipment mechanism to adapt it to airtightness testing operations under high pressure.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0007] This disclosure provides at least one airtightness testing mechanism for membrane electrodes and an integrated airtightness testing machine using the same.

[0008] In a first aspect, embodiments of this disclosure provide an airtightness testing mechanism for a membrane electrode assembly (MEA) for airtightness testing of a product under test, comprising: a hydraulic drive position and a testing position, wherein a plurality of pull rod guide posts are fixedly connected between the hydraulic drive position and the testing position; a pressure head traction plate, movably connected to the pull rod guide posts and located between the hydraulic drive position and the testing position; a main hydraulic cylinder, connected between the hydraulic drive position and the pressure head traction plate, for driving the pressure head traction plate to move along the pull rod guide posts; an upper pressure head, located on the lower side of the pressure head traction plate, driven by the pressure head traction plate to move downward to seal and fit against the upper side of the product under test; a plurality of lower pressure plate seats, equidistantly connected to the testing position; a lower pressure plate, located above the lower pressure plate seats, for fitting and sealing against the lower side of the product under test; and a track assembly, located between two lower pressure plate seats, the track assembly for moving the lower pressure plate out or in.

[0009] In one alternative embodiment, several auxiliary hydraulic cylinders are included, connected between the hydraulic drive position and the pressure head traction plate, with their circumference located outside the main hydraulic cylinder.

[0010] In one alternative embodiment, the track assembly includes: two conveying tracks located between two lower pressure plate seats, which are lower than the height of the lower pressure plate seats on both sides when at rest; and a plurality of lifting cylinders for lifting the conveying tracks so that they contact and drive the lower pressure plates away from the lower pressure plate seats.

[0011] In an optional embodiment, a lower pressure plate displacement driving assembly is further included. The lower pressure plate displacement driving assembly includes: a lower pressure plate displacement driving cylinder connected to the detection position; and a movable block fixedly connected to the lower pressure plate. The lower pressure plate displacement driving cylinder is used to fix the lower pressure plate horizontally via the movable block when the lower pressure plate is located on the lower pressure plate seat; or to drive the lower pressure plate to move along the conveying track via the movable block when the lower pressure plate leaves the lower pressure plate seat.

[0012] In one optional embodiment, a limiting plate is provided on the side of the lower pressure plate seat away from the movable block, the limiting plate being used to limit the excessive displacement of the lower pressure plate; the limiting plate is connected to a buffer spring, the buffer spring being used to buffer the displacement of the lower pressure plate.

[0013] In one optional embodiment, the lower pressure plate displacement drive assembly further includes: a cylinder connector connected to the piston rod of the lower pressure plate displacement drive cylinder, wherein the cylinder connector is connected to a cylinder connector guide wheel; the movable block is provided with a movable block groove; wherein the cylinder connector is movably connected to the movable block groove through the cylinder connector guide wheel.

[0014] In one optional embodiment, the conveying track has an L-shaped cross-section; the lower side of the lower pressure plate is connected to: a first lower pressure plate roller, which is correspondingly engaged with the horizontal surface of the conveying track, and a second lower pressure plate roller, which is correspondingly engaged with the vertical surface of the conveying track.

[0015] In one alternative embodiment, the track assembly further includes: a lifting cylinder connecting plate connected between the two lifting cylinders; and a lifting sensor corresponding to the lifting cylinder connecting plate is connected to the detection position.

[0016] In one optional embodiment, the upper pressure head includes: an upper pressure head connecting plate, fixedly connected to the pressure head traction plate; an upper pressure head plate, connected to the upper pressure head connecting plate, for sealing and fitting the upper side of the product to be tested; and a spoke sensor for detecting pressure.

[0017] Secondly, this disclosure also provides an airtight integrated machine, including: an airtightness detection mechanism for membrane electrodes as described above; and a secondary conveying track correspondingly connected to the track assembly.

[0018] The beneficial effects of this utility model are as follows: the airtightness testing mechanism for membrane electrodes and the integrated airtightness testing machine using it, through the pressure head traction plate set between the hydraulic drive position and the testing position, indirectly connect the main hydraulic cylinder and the upper pressure head. This has two advantages: First, the concentrated force can be distributed into a surface load and transmitted to the upper pressure head through the pressure head traction plate, avoiding local deformation and sealing failure of the membrane electrode due to single-point force, which is especially suitable for testing large-size membrane electrodes with a width ≥ 500mm. Second, it can isolate hydraulic shocks and protect the membrane electrode product under test. The start and stop of the hydraulic system will generate instantaneous pressure fluctuations. The indirect connection structure can buffer the impact load and prevent micro-cracks from appearing in the catalyst layer and proton exchange membrane of the membrane electrode due to instantaneous high pressure, thereby reducing the scrap rate. The lower pressure plate and multiple lower pressure plate seats are in contact and fitted together, and the track assembly is set between two lower pressure plate seats. Without affecting the movement of the lower pressure plate in and out, the contact area between the lower pressure plate and the lower pressure plate seat can be maximized, and the pressure intensity on the bottom of the lower pressure plate can be reduced. This allows it to adapt to the high pressure air tightness test of 5 MPa. The membrane electrode is fixed by pressing the upper pressure head and the lower pressure plate cover. Then, gas is blown out and the airflow fluctuation is detected to determine whether there is gas leakage and thus obtain the air tightness.

[0019] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A perspective view of an airtightness detection mechanism for a membrane electrode provided in an embodiment of this disclosure;

[0023] Figure 2 for Figure 1 A rear-view stereoscopic view;

[0024] Figure 3 for Figure 1 Schematic diagram of some components;

[0025] Figure 4 for Figure 3 Enlarged diagram of A in the middle;

[0026] Figure 5 A perspective view of an airtight integrated machine provided for an embodiment of this disclosure;

[0027] Figure 6 This is a schematic diagram of the upper pressure head.

[0028] In the picture:

[0029] Product under test 100

[0030] Hydraulic drive position 11, detection position 12, lifting sensor 121, pull rod guide column 13, pressure head traction plate 14.

[0031] Main hydraulic cylinder 2, auxiliary hydraulic cylinder 21

[0032] Upper pressure head 3, upper pressure head connecting plate 31, upper pressure head pressure plate 32, wheel spoke sensor 33

[0033] Lower pressure plate seat 4, limit plate 41, buffer spring 42

[0034] Lower pressure plate 5, first lower pressure plate roller 51, second lower pressure plate roller 52

[0035] Track assembly 6, conveyor track 61, lifting cylinder 62, lifting cylinder connecting plate 63

[0036] Lower pressure plate displacement drive assembly 7, lower pressure plate displacement drive cylinder 71, movable block 72, cylinder connector 73, cylinder connector guide wheel 74, movable block slide groove 75.

[0037] Auxiliary conveyor track 8. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] Research has found that existing airtightness testing equipment typically operates at pressures below 1 MPa for membrane electrode assembly airtightness testing, making it unsuitable for ultra-high pressure airtightness testing. In particular, the increased air pressure applied to the product under test creates a significant reaction force on the airtightness testing equipment, leading to instability and inaccurate measurement results. This can result in unreliable outcomes, potentially causing misjudgments and misleading information.

[0040] Based on the above research, this disclosure provides an airtightness testing mechanism for membrane electrodes and an integrated airtightness testing machine using the same. By using a pressure head traction plate positioned between the hydraulic drive position and the testing position, the main hydraulic cylinder and the upper pressure head are indirectly connected. The lower pressure plate and multiple lower pressure plate seats are in contact and engaged, and a track assembly is positioned between two lower pressure plate seats. Without affecting the movement of the lower pressure plate in and out, the contact area between the lower pressure plate and the lower pressure plate seat can be maximized, and the pressure intensity on the bottom of the lower pressure plate can be reduced. This allows it to adapt to high-pressure airtightness testing at 5 MPa. The membrane electrode is fixed by the upper pressure head and the lower pressure plate covering the membrane electrode. Then, by blowing out gas and detecting the airflow fluctuation, the airtightness can be determined to determine whether there is a gas leak.

[0041] The shortcomings of the above solutions are the result of the inventors' practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as contributions made by the inventors to this disclosure.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0044] For example: see Figure 1 , Figure 2 At least one embodiment illustrates an airtightness testing mechanism for a membrane electrode assembly (MEA) for airtightness testing of a product 100 under test. The mechanism includes: a hydraulic drive position 11 and a detection position 12, wherein a plurality of pull rod guide posts 13 are fixedly connected between the hydraulic drive position 11 and the detection position 12; a pressure head traction plate 14, movably connected to the pull rod guide posts 13 and located between the hydraulic drive position 11 and the detection position 12; and a main hydraulic cylinder 2, connected between the hydraulic drive position 11 and the pressure head traction plate 14, for driving the pressure head traction plate. The head traction plate 14 is displaced along the pull rod guide post 13; the upper pressure head 3, located on the lower side of the pressure head traction plate 14, is driven by the pressure head traction plate 14 to move downward to seal and adhere to the upper side of the product to be tested 100; several lower pressure plate seats 4 are equidistantly connected to the detection position 12; the lower pressure plate 5, located above the lower pressure plate seats 4, is used to adhere to and seal the lower side of the product to be tested 100; the track assembly 6 is located between two lower pressure plate seats 4, and the track assembly 6 is used to move the lower pressure plate 5 out or in.

[0045] In short, to be suitable for high-pressure (generally considered to be around 5 MPa) airtightness testing, the main hydraulic cylinder 2 can, but is not limited to, a size with a cylinder diameter of 560 mm, a rod diameter of 460 mm, and a stroke of 300 mm, enabling it to provide stronger pressure and thrust. Simultaneously, the dimensions of key components such as the hydraulic drive position 11, the detection position 12, the pull rod guide post 13, and the pressure head traction plate 14 are increased. Structurally, the pressure head traction plate 14 is positioned between the hydraulic drive position 11 and the detection position 12 via the pull rod guide post 13. The main hydraulic cylinder 2 and the upper pressure head 3 are connected to the upper and lower sides of the pressure head traction plate 14, respectively, ensuring that the piston rod of the main hydraulic cylinder 2 and the upper pressure head 3 do not directly contact each other. The purpose of this design is twofold: first, to achieve a more uniform pressure distribution and reduce localized overpressure. The concentrated force is dispersed into a surface load and transferred to the upper pressure head 3 via the pressure head traction plate 14, preventing localized deformation and sealing failure of the membrane electrode due to single-point stress. This is particularly suitable for testing large-size membrane electrodes with a width ≥ 500mm. Second, to isolate hydraulic shocks and protect the membrane electrode product under test. The start and stop of the hydraulic system generates instantaneous pressure fluctuations, and the indirect connection structure buffers the impact load, preventing micro-cracks in the catalyst layer and proton exchange membrane of the membrane electrode due to instantaneous high pressure, thus reducing the scrap rate. Multiple lower pressure plate seats 4 are connected above the large-size testing position 12, and the track assembly 6 is positioned between two lower pressure plate seats 4. This maximizes the contact area between the lower pressure plate 5 and the lower pressure plate seat 4 without affecting the movement of the lower pressure plate 5, reducing the pressure intensity on the bottom of the lower pressure plate. Both the upper pressure head 3 and the lower pressure plate 5 are equipped with corresponding air holes (not shown in the figure), sealing rings, and other conventional airtightness testing components (not shown in the figure). In use, the track assembly 6 moves the lower pressure plate 5, carrying the product under test 100, below the upper pressure head 3. The product under test 100 (membrane electrode assembly) is fixed by the upper pressure head 3 and the lower pressure plate 5 pressing against it. Then, gas is blown out and the airflow fluctuation within the sealing ring cavity is detected to determine if there is any gas leakage and thus obtain the airtightness. The track assembly 6 then removes the tested product under test 100 and the lower pressure plate 5. It is understood that the lower pressure plate 5 and the conveying track 61 can be connected, but are not limited to, a slider-rail connection, a rolling connection, etc.

[0046] See Figure 1 , Figure 2 In some embodiments, several auxiliary hydraulic cylinders 21 are included, connected between the hydraulic drive position 11 and the pressure head traction plate 14, with their circumference located outside the main hydraulic cylinder 2. Two are shown in the figure, simultaneously pushing and pulling the pressure head traction plate 14 to assist the main hydraulic cylinder 2 and further enhance pressure and thrust.

[0047] See Figure 3 , Figure 4In some embodiments, the track assembly 6 includes: two conveying tracks 61 located between two lower pressure plate seats 4, which are lower than the height of the lower pressure plate seats 4 on both sides when at rest; and a plurality of lifting cylinders 62 for lifting the conveying tracks 61 so that they abut against and drive the lower pressure plates 5 away from the lower pressure plate seats 4.

[0048] In short, multiple lifting cylinders 62 can lift the conveyor track 61 up and down. When the equipment undergoes an airtightness test, the lifting cylinders 62 lower the conveyor track 61 to a height below the lower pressure plate seats 4 on both sides, with the lower pressure plate 5 contacting the lower pressure plate seats 4. After the airtightness test is completed, the lifting cylinders 62 raise the conveyor track 61 to a height above the lower pressure plate seats 4 on both sides, with the lower pressure plate 5 directly contacting the conveyor track 61, allowing it to be removed by the conveyor track 61. It is understood that the lower pressure plate 5 and the conveyor track 61 can be connected, but are not limited to, a slider-rail connection, a rolling connection, etc.

[0049] See Figure 3 , Figure 4 In some embodiments, a lower pressure plate displacement drive assembly 7 is also included. The lower pressure plate displacement drive assembly 7 includes: a lower pressure plate displacement drive cylinder 71 connected to the detection position 12; and a movable block 72 fixedly connected to the lower pressure plate 5. The lower pressure plate displacement drive cylinder 71 is used to fix the lower pressure plate 5 in the horizontal direction through the movable block 72 when the lower pressure plate 5 is located on the lower pressure plate seat 4; or to drive the lower pressure plate 5 to move along the conveying track 61 through the movable block 72 when the lower pressure plate 5 leaves the lower pressure plate seat 4.

[0050] In short, when an airtightness test is required, the lower pressure plate 5 abuts against the lower pressure plate seat 4. At this time, the lower pressure plate displacement drive cylinder 71 provides a fixing force for the lower pressure plate 5. The piston rod of the lower pressure plate displacement drive cylinder 71 will keep the movable block 72 stationary, thereby keeping the lower pressure plate 5 stationary.

[0051] Simultaneously, after the airtightness test is completed, in order to move the lower pressure plate 5 in and out after it comes into contact with the conveyor track 61, the lower pressure plate displacement drive cylinder 71 provides a pushing and pulling force to the lower pressure plate 5. When the piston rod of the lower pressure plate displacement drive cylinder 71 extends or retracts, its piston rod pushes and pulls the movable block 72, and the movable block 72 drives the lower pressure plate 5 to move in or out along the conveyor track 61. It can be understood that the lower pressure plate 5 and the conveyor track 61 can be connected by, but are not limited to, a slider-rail connection, a rolling connection, etc.

[0052] See Figure 3 , Figure 4 In some embodiments, a limiting plate 41 is provided on the side of the lower pressure plate seat 4 away from the movable block 72. The limiting plate 41 is used to limit the excessive displacement of the lower pressure plate 5. The limiting plate 41 is connected to a buffer spring 42, which is used to buffer the displacement of the lower pressure plate 5.

[0053] In short, when an airtightness test is required, the lower pressure plate 5 abuts against the lower pressure plate seat 4. At this time, the lower pressure plate displacement drive cylinder 71 provides a fixing force on one side of the lower pressure plate 5, while the limiting plate 41 fixes and holds the other side of the lower pressure plate 5. The buffer spring 42 is used to buffer the displacement of the lower pressure plate 5 towards the limiting plate 41. The compression force of the buffer spring 42 and the holding force of the lower pressure plate displacement drive cylinder 71 together keep the lower pressure plate 5 stationary during high-pressure airtightness testing.

[0054] See Figure 3 , Figure 4 In some embodiments, the lower pressure plate displacement drive assembly 7 further includes: a cylinder connector 73 connected to the piston rod of the lower pressure plate displacement drive cylinder 71, wherein the cylinder connector 73 is connected to a cylinder connector guide wheel 74; the movable block 72 is provided with a movable block groove 75; wherein the cylinder connector 73 is movably connected to the movable block groove 75 through the cylinder connector guide wheel 74.

[0055] See Figure 3 , Figure 4 In some embodiments, the conveying track 61 has an L-shaped cross-section; the lower side of the lower pressure plate 5 is connected to: a first lower pressure plate roller 51, which corresponds to the horizontal surface of the conveying track 61, and a second lower pressure plate roller 52, which corresponds to the vertical surface of the conveying track 61. In short, in this embodiment, the lower pressure plate 5 and the conveying track 61 are connected by a rolling connection.

[0056] See Figure 3 , Figure 4 In some embodiments, the track assembly 6 further includes: a lifting cylinder connecting plate 63 connected between two lifting cylinders 62; and a detection position 12 connected to a lifting sensor 121 corresponding to the lifting cylinder connecting plate 63.

[0057] In short, the two ends of the lifting cylinder connecting plate 63 can be used to place the conveying track 61. Thus, as the two lifting cylinders 62 lift synchronously, the lifting cylinder connecting plate 63 will synchronously drive the conveying track 61 to rise. At the same time, only one lifting sensor 121 corresponding to the lifting cylinder connecting plate 63 is needed to monitor the lifting and lowering of the entire track assembly 6.

[0058] See Figure 6 In some embodiments, the upper pressure head 3 includes: an upper pressure head connecting plate 31, fixedly connected to the pressure head traction plate 14; an upper pressure head plate 32, connected to the upper pressure head connecting plate 31, for sealing and adhering to the upper side of the product to be tested 100; and a spoke sensor 33 for detecting pressure.

[0059] In short, the wheel spoke sensor 33 allows for better monitoring of the entire airtight mechanism during high-pressure airtightness testing.

[0060] See Figure 5 At least one embodiment also provides an airtight integrated machine, including: an airtight detection mechanism for membrane electrodes as described above; and a secondary conveying track 8, correspondingly connected to the track assembly 6.

[0061] In short, when the equipment performs an airtightness test, the lifting cylinder 62 lowers the conveyor track 61 to a height lower than the lower pressure plate seats 4 on both sides, creating a height difference between the conveyor track 61 and the auxiliary conveyor track 8. After the airtightness test, the lifting cylinder 62 raises the conveyor track 61 to a height higher than the lower pressure plate seats 4 on both sides, at which point the conveyor track 61 and the auxiliary conveyor track 8 are horizontally aligned. This allows the lower pressure plate 5, carrying the tested membrane electrode, to move out along the conveyor track 61 and the auxiliary conveyor track 8. Then, the manual station of the machine removes the tested membrane electrode, places the product to be tested 100 on it, and moves it along the auxiliary conveyor track 8 and the conveyor track 61 into the membrane electrode airtightness testing mechanism for testing.

[0062] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0063] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0064] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0065] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0066] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0067] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0068] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0069] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0070] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0071] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A membrane electrode airtightness testing mechanism for performing airtightness testing on a product (100) to be tested, characterized in that, include: A hydraulic drive position (11) and a detection position (12), wherein a plurality of pull rod guide posts (13) are fixedly connected between the hydraulic drive position (11) and the detection position (12). The pressure head traction plate (14) is movably connected to the pull rod guide post (13) and is located between the hydraulic drive position (11) and the detection position (12); The main hydraulic cylinder (2) is connected between the hydraulic drive position (11) and the pressure head traction plate (14) to drive the pressure head traction plate (14) to move along the pull rod guide column (13); The upper pressure head (3) is located on the lower side of the pressure head traction plate (14), and is driven by the pressure head traction plate (14) to move downward to seal and fit the upper side of the product to be tested (100); Several pressure plate seats (4) are equidistantly connected to the detection position (12); The lower pressure plate (5) is located above the lower pressure plate seat (4) and is used to fit and seal the lower side of the product to be tested (100); A track assembly (6) is located between two lower pressure plate seats (4) for moving the lower pressure plate (5) out or in. The track assembly (6) includes: Two conveying tracks (61) are located between two lower pressure plate seats (4) and are lower than the height of the lower pressure plate seats (4) on both sides when stationary; Multiple lifting cylinders (62) are used to lift the conveying track (61) so that it contacts and drives the lower pressure plate (5) away from the lower pressure plate seat (4). The lower pressure plate displacement drive assembly (7) includes: The lower pressure plate displacement drive cylinder (71) is connected to the detection position (12). The movable block (72) is fixedly connected to the lower pressure plate (5); The lower pressure plate displacement drive cylinder (71) is used to fix the lower pressure plate (5) in the horizontal direction by means of the movable block (72) when the lower pressure plate (5) is located on the lower pressure plate seat (4). or When the lower pressure plate (5) leaves the lower pressure plate seat (4), the movable block (72) drives the lower pressure plate (5) to move along the conveying track (61).

2. The airtightness detection mechanism for membrane electrodes according to claim 1, characterized in that, include: Several auxiliary hydraulic cylinders (21) are connected between the hydraulic drive position (11) and the pressure head traction plate (14), with their circumference located outside the main hydraulic cylinder (2).

3. The airtightness detection mechanism for membrane electrodes according to claim 1, characterized in that, The lower pressure plate seat (4) is provided with a limiting plate (41) on the side away from the movable block (72), and the limiting plate (41) is used to limit the excessive displacement of the lower pressure plate (5). The limiting plate (41) is connected to a buffer spring (42), which is used to buffer the displacement of the lower pressure plate (5).

4. The airtightness detection mechanism for membrane electrodes according to claim 1, characterized in that, The lower pressure plate displacement drive assembly (7) also includes: A cylinder connector (73) is connected to the piston rod of the lower pressure plate displacement drive cylinder (71), wherein the cylinder connector (73) is connected to a cylinder connector guide wheel (74). The movable block (72) is provided with a movable block groove (75); The cylinder connector (73) is movably connected to the movable block groove (75) via the cylinder connector guide wheel (74).

5. The airtightness detection mechanism for membrane electrodes according to claim 1, characterized in that, The cross-section of the conveying track (61) is L-shaped; The lower side of the lower pressure plate (5) is connected to: The first lower pressure plate roller (51) is correspondingly fitted to the horizontal plane of the conveying track (61). The second lower pressure plate roller (52) is correspondingly fitted to the vertical surface of the conveying track (61).

6. The airtightness detection mechanism for membrane electrodes according to claim 1, characterized in that, The track assembly (6) also includes: A lifting cylinder connecting plate (63) is connected between the two lifting cylinders (62); The detection position (12) is connected to a lifting sensor (121) corresponding to the lifting cylinder connecting plate (63).

7. The airtightness detection mechanism for membrane electrodes according to claim 1, characterized in that, The upper pressure head (3) includes: The upper pressure head connecting plate (31) is fixedly connected to the pressure head traction plate (14). Upper pressure head plate (32) is connected to the upper pressure head connecting plate (31) to seal and fit the upper side of the product to be tested (100); A spoke sensor (33) is used to detect pressure.

8. An airtight integrated machine, characterized in that, include: The airtightness detection mechanism for membrane electrodes as described in any one of claims 1-7; The auxiliary conveyor track (8) is connected to the track assembly (6).

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