Proton exchange membrane tensile strength testing device and testing method for fuel cell

Abstract

The present invention discloses a proton exchange membrane tensile strength detection device and a detection method for fuel cells, which relate to detection-related technical fields. The proton exchange membrane tensile strength detection device for fuel cells comprises a movable groove, which is opened on the partition plate. A bearing plate is slidably installed in the movable groove. The bearing plate is connected to a push-pull assembly installed at one end of the movable groove. A plurality of guide rails are fixed on the bearing plate. Two No. 2 sliders are slidably installed on the plurality of guide rails. A No. 1 fixing piece is fixed on each of the two No. 2 sliders. Continuous tensile testing of the proton exchange membrane is achieved through the cooperation of the retracting and extending assembly and the stretching assembly, and the stretching force gradually increases. In the present invention, high-precision transmission can be achieved through the cooperation of the increasing gear and the No. 2 gear, and then gradual adjustment is performed, so that the force during stretching is more accurate.

Description

Technical Field

[0001] The present invention relates to the field of detection-related technical fields, and in particular to a device and method for detecting the tensile strength of a proton exchange membrane for a fuel cell. Background Art

[0002] The proton exchange membrane is the core component of the fuel cell, responsible for conducting protons, isolating gases and supporting electrodes. Tensile strength refers to the ability of a material to resist fracture under tension. High tensile strength means that the membrane is not easily broken or deformed during manufacturing and use.

[0003] The specific role of tensile strength in proton exchange membranes is, first, mechanical stability. During fuel cell operation, the membrane will be affected by pressure and temperature changes. If the tensile strength is insufficient, cracks are likely to occur, leading to gas leakage or short circuit.

[0004] Secondly, durability. During long-term operation, repeated expansion and contraction of the membrane may lead to fatigue failure. High tensile strength can delay this process. In addition, the processing during the manufacturing process, such as high-pressure pressing when assembling membrane electrodes, requires the membrane to have sufficient strength to avoid damage.

[0005] Regarding the tensile testing of films, a photovoltaic EVA film production tensile performance testing device was disclosed through search, with announcement number: CN222353647U;

[0006] Existing membrane stretching testing equipment includes but is not limited to the above-mentioned patents. Most of them achieve pulling by means of motor-driven screw movement / cylinder and other structures. Although high-precision cylinders and motors have relatively high precision, due to structural limitations and the accuracy of debugging, there will be more or less errors, and this error will directly affect the amount of pulling, which will lead to ambiguity in the pulling amount and the inability to obtain the accurate numerical value of the membrane. Especially on the proton exchange membrane, its slight deviation will directly affect the test results. Summary of the Invention

[0007] In response to the deficiencies of the prior art, the present invention provides a device and method for detecting the tensile strength of a proton exchange membrane for a fuel cell, which solves the problem of slight deviations in tensile values.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: A proton exchange membrane tensile strength testing device for a fuel cell includes a testing cabinet, the testing cabinet includes a partition located in the middle, a top box is installed on the top of the partition, and a bottom box is installed on the bottom, and further includes:

[0009] A movable groove is provided on the partition plate, a bearing plate is slidably installed in the movable groove, and the bearing plate is connected to a push-pull assembly installed at one end of the movable groove;

[0010] A plurality of guide rails fixed on the carrying plate, two No. 2 sliders are slidably mounted on the plurality of guide rails, a No. 1 fixing piece is fixed to each of the two No. 2 sliders, a No. 2 fixing piece is relatively slidably mounted on the No. 1 fixing piece, and an anti-slip piece is fixed between the No. 1 fixing piece and the No. 2 fixing piece;

[0011] A retractable assembly is installed on the two second fixing members;

[0012] A stretching mechanism, mounted on the carrier plate, the stretching mechanism being connected to the two first fixing members;

[0013] The feedback component is mounted on the partition.

[0014] Furthermore, the push-pull assembly includes a No. 1 bidirectional lead screw rotatably mounted on the end of the movable groove, both ends of the No. 1 bidirectional lead screw are sleeved with threaded sleeves threadedly matched therewith, and transmission plates are rotatably mounted on the two threaded sleeves, the two transmission plates are cross-rotatably connected, and the ends of the two transmission plates away from the threaded sleeves are rotatably mounted with No. 1 sliders, and the two No. 1 sliders are slidably connected to the bearing plate;

[0015] Among them, a No. 1 motor is also fixed on the partition, and the output shaft of the No. 1 motor is coaxially fixed with the No. 1 bidirectional screw.

[0016] Furthermore, the retracting assembly includes a retracting roller detachably mounted on the two second fixing members, and a guide member is mounted on the two retracting rollers on the sides away from each other;

[0017] Wherein, the guide member includes a positioning frame and a plurality of guide rods installed on the positioning frame.

[0018] Furthermore, the stretching mechanism includes two No. 2 bidirectional screws rotatably mounted on the bearing plate, both ends of the two No. 2 bidirectional screws are sleeved with threaded transmission members threadedly matched therewith, and the threaded transmission members are connected to the No. 1 fixing member through a tightening member;

[0019] An assembly groove is provided on the bearing plate along the length direction, a driving assembly is installed in the assembly groove, and the driving assembly is connected to the two No. 2 bidirectional screws.

[0020] Furthermore, the tensioning member includes a mounting member fixed to the bottom of the No. 1 fixing member, and the mounting member is provided with a receiving groove on the side facing the threaded transmission member, and a guide shaft is fixed in the receiving groove. The guide shaft passes through the threaded transmission member and is slidably connected thereto, and a spring is sleeved on the guide shaft.

[0021] Furthermore, the drive assembly includes a No. 1 transmission rod rotatably mounted in the assembly groove, the No. 1 transmission rod being connected to the two No. 2 bidirectional lead screws via a transmission chain, a No. 2 transmission rod being rotatably mounted in the assembly groove, an increasing gear being axially slidably mounted on the No. 2 transmission rod, the increasing gear cooperating with the No. 2 gear coaxially fixed to the No. 1 transmission rod;

[0022] An adjusting member connected to the increasing gear is installed on one side thereof, and the second transmission rod is connected to a driving member installed in the assembly groove;

[0023] The teeth of the increasing gear have the roller body length as the maximum length and gradually decrease in a single direction.

[0024] Furthermore, the adjusting member includes a screw rod rotatably mounted on one side of the No. 2 transmission rod, and the screw rod is provided with a No. 1 follower threadedly engaged therewith, and the No. 1 follower is also rotatably connected to the increasing gear, and the screw rod is connected to the driving member.

[0025] Further,

[0026] The driving member includes a No. 2 motor fixed in the assembly slot, and the output shaft of the No. 2 motor is coaxially fixed with the No. 2 transmission rod;

[0027] A ratchet disc is slidably mounted on the second transmission rod, and the ratchet disc cooperates with a first limiting strip fixed on the second transmission rod through a first limiting groove provided on the inner wall. A pawl disc is coaxially fixed on the screw rod, and the pawl disc cooperates with the ratchet disc in one direction.

[0028] A third gear and a first gear are coaxially fixed on the pawl plate and the ratchet plate, respectively, and the third gear and the first gear are staggered;

[0029] A No. 2 follower is rotatably mounted on the ratchet disc, and the No. 2 follower is connected to an electromagnet mounted in the assembly slot.

[0030] Further,

[0031] The feedback assembly includes a bracket fixed on the partition, a plurality of guide rods are fixed to the bottom of the bracket, and a test piece No. 1 is slidably mounted on the guide rods;

[0032] A second test piece that matches the first test piece is fixed on the bearing plate;

[0033] A plurality of electric push rods are fixed on the bracket, and movable rods of the electric push rods are fixed to the test piece No. 1. A processing device is also fixed on the bracket, and the processing device is electrically connected to the test piece No. 2 and the test piece No. 1 through wires.

[0034] The present invention also provides a method for detecting the tensile strength of a proton exchange membrane for a fuel cell, which uses the device for detecting the tensile strength of a proton exchange membrane for a fuel cell, comprising the following steps:

[0035] Step 1: Install the proton exchange membrane on the retractable assembly, and use the retractable assembly to reel in and unreel the membrane to continuously provide the proton exchange membrane for stretching testing to the stretching mechanism;

[0036] Step 2: The proton exchange membrane is stretched by the stretching mechanism, and the stretching is repeated in conjunction with the retracting assembly, and the strength of the stretching is gradually increased;

[0037] Step 3: After the proton exchange membrane is stretched, the stretched proton exchange membrane is tested and analyzed through the feedback component, and the test is performed each time it is stretched, thereby obtaining data of the proton exchange membrane when it is stretched to different degrees.

[0038] The present invention has the following beneficial effects:

[0039] (1) The proton exchange membrane tensile strength testing device for fuel cells uses a push-pull assembly to move the support plate toward the door of the testing cabinet, so that the proton exchange membrane can be installed in the retractable assembly.

[0040] (2) The proton exchange membrane tensile strength testing device for fuel cells realizes continuous tensile testing of the proton exchange membrane by cooperating with the retractable assembly and the stretching assembly, and the stretching force gradually increases;

[0041] Among them, in the present invention, by cooperating with the increasing gear and the second gear, a gradual adjustment is performed to achieve high-precision transmission, making the force during stretching more accurate;

[0042] Secondly, the tensioning component integrated in the stretching mechanism can tighten the proton exchange membrane after each stretching and connect to the next stretching to ensure the accuracy of the stretching.

[0043] (3) The proton exchange membrane tensile strength testing device for fuel cells can detect and analyze the proton exchange membrane after each stretching through the feedback component, and obtain data on the proton exchange membrane under different tensile forces.

[0044] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0046] Figure 2 Schematic diagram of the structure inside the detection box of the present invention;

[0047] Figure 3 It is a schematic diagram of the structure above the partition in the present invention;

[0048] Figure 4 Schematic diagram of the structure of the push-pull assembly in the present invention;

[0049] Figure 5 is an exploded view of the stretching mechanism of the present invention;

[0050] Figure 6 Schematic diagram of the structure of the guide shaft and spring in the present invention;

[0051] Figure 7 is a cross-sectional view of the load-bearing plate of the present invention;

[0052] Figure 8 This is a schematic diagram of the structure inside the assembly slot of the present invention;

[0053] Figure 9 For the present invention Figure 8 A magnified view of the local structure at point A;

[0054] Figure 10 For the present invention Figure 8 Structural diagram from another angle;

[0055] Figure 11 It is a structural schematic diagram of the incremental gear in the present invention.

[0056] In the figure: 1. Inspection cabinet; 2. Loading plate; 201. Assembly slot; 3. Bracket; 301. Electric push rod; 302. Handling equipment; 303. Test piece No. 1; 304. Test piece No. 2; 305. Guide rod; 4. Motor No. 1; 401. Threaded sleeve; 402. Bidirectional lead screw No. 1; 403. Drive plate; 404. Slider No. 1; 5. Guide rail; 501. Slider No. 2; 502. Fixing piece No. 1; 503. Fixing piece No. 2; 504. Anti-slip piece; 505. Bidirectional lead screw No. 2; 506. Threaded drive Parts; 507, guide shaft; 508, spring; 6, winding roller; 601, guide part; 7, transmission rod No. 1; 701, transmission chain; 702, screw rod; 703, transmission rod No. 2; 704, increasing gear; 705, follower No. 1; 706, pawl plate; 707, follower No. 2; 708, ratchet plate; 709, gear No. 1; 7010, limit slot No. 1; 7011, limit strip No. 1; 7012, electromagnet; 7013, motor No. 2; 7014, gear No. 2; 7015, gear No. 3. DETAILED DESCRIPTION

[0057] The following is based on Figures 1-11 The present invention describes a proton exchange membrane tensile strength detection device for a fuel cell provided by an embodiment of the present invention.

[0058] See also Figures 1-11 , an embodiment of the present invention provides a technical solution: a proton exchange membrane tensile strength testing device for a fuel cell, comprising a testing cabinet 1, a plurality of guide rails 5 fixed on a supporting plate 2, a retractable assembly mounted on the two second fixing members 503, a stretching mechanism mounted on the supporting plate 2, and a feedback assembly, wherein the testing cabinet 1 comprises a partition located in the middle, a top box being mounted on the top of the partition, a bottom box being mounted on the bottom, and a movable groove being provided on the partition, a supporting plate 2 being slidably mounted in the movable groove, and the supporting plate 2 being connected to a push-pull assembly mounted at one end of the movable groove.

[0059] Multiple guide rails 5 are fixed to the carrier plate 2. Two second sliders 501 are slidably mounted on each of the guide rails 5. A first fixing member 502 is fixed to each of the second sliders 501. A second fixing member 503 is slidably mounted on the first fixing member 502. Anti-slip members 504 are fixed between the first and second fixing members 502, 503. A stretching mechanism is connected to the two first fixing members 502, and a feedback assembly is mounted on the partition.

[0060] In this embodiment of the present invention, the proton exchange membrane is mounted on a retractable assembly, which unwinds and rewinds the membrane. Two fixing members (number one) 502 and two fixing members (number two) 503 clamp the two ends of the proton exchange membrane test portion. The lifting assembly then drives the two fixing members (number one) 502 in opposite directions, thereby applying a lifting force to the proton exchange membrane.

[0061] Among them, the role of the proton exchange membrane in the battery is to provide a channel for proton migration and transmission, separate gas reactants and block the electrolyte. Simply put, protons can pass through, but hydrogen molecules and water molecules cannot pass through.

[0062] When testing the proton exchange membrane by stretching, it is found that when the proton exchange membrane is stretched to a certain extent, it will affect the passage of protons, or when the proton exchange membrane is stretched to a certain extent, it will lose its barrier to hydrogen molecules and water molecules.

[0063] In the present invention, the sliding cooperation between the second slider 501 and the guide rail 5 allows the two first fixing members 502 to move relative / oppositely for guidance, and the anti-slip member 504 can prevent the proton exchange membrane from being clamped and slipping during pulling.

[0064] Secondly, in clamping the proton exchange membrane, the proton exchange membrane between the No. 1 fixing part 502 and the No. 2 fixing part 503 is clamped by driving the No. 2 fixing part 503 to move toward the No. 1 fixing part 502. The present invention does not specifically limit the method of driving the No. 2 fixing part 503 to move, and it can be driven by an electric push rod 301 or a hydraulic cylinder.

[0065] After applying a pulling force to the sub-exchange membrane, a detection test is performed through the feedback component to obtain the stretched data.

[0066] The push-pull assembly includes a first bidirectional lead screw 402 rotatably mounted at the end of a movable slot. Both ends of the first bidirectional lead screw 402 are fitted with threaded sleeves 401 that threadably engage with the lead screw. A transmission plate 403 is rotatably mounted on each of the two threaded sleeves 401. The two transmission plates 403 are rotatably connected at their midpoints. A first slider 404 is rotatably mounted on the ends of the two transmission plates 403 away from the threaded sleeves 401. Both first sliders 404 are slidably connected to the support plate 2. In this embodiment, the threads at both ends of the first bidirectional lead screw 402 have opposite rotation directions and the same pitch.

[0067] Among them, the partition is also fixed on the No. 1 motor 4, and the output shaft of the No. 1 motor 4 is coaxially fixed with the No. 1 bidirectional screw 402.

[0068] In an embodiment of the present invention, when motor No. 1 is working, it drives the bidirectional screw No. 1 402 to rotate through its output shaft. When the bidirectional screw No. 1 402 rotates, it cooperates with the threads of the two threaded sleeves 401 to drive the two threaded sleeves 401 to move relative or oppositely. By driving the two threaded sleeves 401 to move relative or oppositely, the two transmission plates 403 are driven to perform shearing movement, and then the two No. 1 sliders 404 are used to drive the supporting plate 2 to move toward or away from the door of the detection cabinet 1.

[0069] Among them, by driving the carrying plate 2 to move toward the door of the detection cabinet 1, it is more convenient to install the proton exchange membrane on the retractable assembly.

[0070] The retracting and unretracting assembly includes a reeling roller 6 detachably mounted on two No. 2 fixing members 503 , and a guide member 601 is mounted on the side of the two reeling rollers 6 that are away from each other.

[0071] The guide member 601 includes a positioning frame and a plurality of guide rods installed on the positioning frame.

[0072] In an embodiment of the present invention, a winding roller 6 wrapped with a proton exchange membrane is rotatably installed on one of the No. 2 fixing parts 503. The proton exchange membrane on the No. 2 fixing part 503 passes through two guide parts 601 and is fixed to the winding roller 6 installed on the other No. 2 fixing part 503. When the proton exchange membrane passes through the two guide parts 601, it is located between the No. 2 fixing part 503 and the No. 1 fixing part 502.

[0073] A motor is installed on one of the second fixing parts 503, and the output shaft of the motor is coaxially fixed to a winding roller 6 used for winding. When the motor is working, the winding roller 6 used for winding is driven to rotate to wind the proton exchange membrane, and the corresponding other winding roller 6 is unwound.

[0074] The function of this embodiment is that after the first test is completed, a winding roller 6 used for winding is driven to rotate so that the first test part is wound onto the winding roller 6. At this time, the proton exchange membrane between the No. 1 fixing part 502 and the No. 2 fixing part 503 is not tested, and the second test can be performed through the proton exchange membrane of this part. And so on, the test work can be carried out successively.

[0075] It should be noted that the above-mentioned "detachable connection" of the present invention means that both winding rollers 6 can be detached, and when installed on the second fixing member 503, they are rotatably connected to the second fixing member 503. The present invention does not specifically limit the implementation method.

[0076] The stretching mechanism includes two second-order bidirectional screws 505 rotatably mounted on the support plate 2. Each end of the second-order bidirectional screws 505 is fitted with a threaded transmission member 506 that engages with the threaded transmission member. The threaded transmission member 506 is connected to the first fixing member 502 via a tensioning member. The threads at the ends of the second-order bidirectional screws 505 have opposite rotation directions and the same pitch.

[0077] An assembly groove 201 is provided on the bearing plate 2 along the length direction. A driving assembly is installed in the assembly groove 201 . The driving assembly is connected to two No. 2 bidirectional lead screws 505 .

[0078] In an embodiment of the present invention, when the driving component is working, the two No. 2 bidirectional screws 505 are driven to rotate synchronously, so as to drive the two threaded transmission parts 506 to move relative / oppositely through the threaded cooperation with the two threaded transmission parts 506, and then drive the two No. 1 fixing parts 502 to move relative / oppositely through the tensioning part. After the proton exchange membrane is clamped by the No. 1 fixing part 502 and the No. 2 fixing part 503, a tensile force will be applied to the proton exchange membrane when the two No. 1 fixing parts 502 move in opposite directions.

[0079] After the proton exchange membrane completes a specified degree of stretching, it is tested and the test information is fed back through the feedback component.

[0080] The tensioning member includes a mounting member fixed to the bottom of the No. 1 fixing member 502. The mounting member is provided with a receiving groove on the side facing the threaded transmission member 506. A guide shaft 507 is fixed in the receiving groove. The guide shaft 507 passes through the threaded transmission member 506 and is slidably connected thereto. A spring 508 is sleeved on the guide shaft 507.

[0081] In an embodiment of the present invention, when the No. 2 bidirectional screw 505 rotates, the two threaded transmission members 506 are driven to move in opposite directions by cooperating with the threads of the threaded transmission member 506. When the two threaded transmission members 506 move in opposite directions, the initial elastic potential energy of the spring 508 is first used to drive the mounting member and the No. 1 fixing member 502 to follow the movement of the threaded transmission member 506. In this process, the proton exchange membrane clamped by the No. 1 fixing member 502 and the No. 2 fixing member 503 will be pulled. When the proton exchange membrane is tightened, the continued movement of the threaded transmission member 506 will compress the spring 508 until the threaded transmission member 506 abuts against the mounting member of the No. 1 fixing member 502.

[0082] Among them, a trigger switch is installed on the side of the mounting part facing the threaded transmission part 506. When the threaded transmission part 506 abuts against the mounting part of the No. 1 fixing part 502, the trigger switch is pressed. After the trigger switch is pressed, the proton exchange membrane is stretched. After the trigger switch is operated, the continued movement of the threaded transmission part 506 will push the No. 1 fixing part 502 and the mounting part of the No. 1 fixing part 502 to move, thereby applying a tensile force to the proton exchange membrane.

[0083] Through the above-mentioned motion state, ineffective stretching motion can be avoided, ensuring that the proton exchange membrane is stretched and then tension is applied, so that the force applied to the proton exchange membrane can be clearly obtained.

[0084] When the two threaded transmission parts 506 move relative to each other and the tension on the proton exchange membrane is released, the elastic potential energy stored in the spring 508 during compression is released, so that the first fixing part 502 and the mounting part of the first fixing part 502 are reset.

[0085] The driving assembly includes a No. 1 transmission rod 7 rotatably installed in the assembly groove 201, the No. 1 transmission rod 7 is connected to two No. 2 bidirectional screws 505 through a transmission chain 701, a No. 2 transmission rod 703 is rotatably installed in the assembly groove 201, and an increasing gear 704 is axially slidably installed on the No. 2 transmission rod 703, and the increasing gear 704 cooperates with the No. 2 gear 7014 coaxially fixed on the No. 1 transmission rod 7.

[0086] An adjusting member connected to the increasing gear 704 is installed on one side thereof, and the second transmission rod 703 is connected to a driving member installed in the assembly slot 201 .

[0087] The teeth of the increasing gear 704 have a maximum length equal to the roller body length and gradually decrease in a single direction.

[0088] In this embodiment of the present invention, multiple second transmission bars are fixed to the circumference of the second transmission rod 703, and second transmission grooves are equidistantly spaced around the inner wall of the incrementing gear 704, which slideably engage with the second transmission bars. This allows the second transmission bars to drive the incrementing gear 704 to rotate synchronously with the second transmission bars when the second transmission rod 703 rotates. Simultaneously, the incrementing gear 704 can slide axially along the second transmission rod 703 without affecting the synchronous transmission between the two. Specifically, the multiple second transmission bars form external splines on the outer wall of the second transmission rod 703, and the second transmission grooves are provided on the inner wall of the incrementing gear 704 to form internal splines on the inner wall of the incrementing gear 704.

[0089] When the driving member is working, it drives the No. 2 transmission rod 703 to rotate. When the No. 2 transmission rod 703 rotates, the increasing gear 704 is driven to rotate synchronously through the cooperation of the second transmission bar and the second transmission groove. When the increasing gear 704 rotates, the No. 2 gear 7014 and the No. 1 transmission rod 7 are driven to rotate through the cooperation with the No. 2 gear 7014, so that when the No. 1 transmission rod 7 rotates, the two No. 2 bidirectional screws 505 are driven to rotate synchronously through the transmission chain 701.

[0090] In this embodiment, the driving member drives the second transmission rod 703 to rotate in two directions, forward and reverse, and the two directions have different effects:

[0091] 1. Drive the No. 2 transmission rod 703 to rotate clockwise. When the No. 2 transmission rod 703 rotates clockwise, the increasing gear 704 is driven to rotate clockwise, so that the No. 2 gear 7014 and the No. 1 transmission rod 7 are driven to rotate counterclockwise through the cooperation of the increasing gear 704 and the No. 2 gear 7014, so as to drive the No. 2 bidirectional lead screw 505 to rotate counterclockwise through the No. 1 transmission rod 7 and the transmission chain 701. The counterclockwise rotation of the No. 2 bidirectional lead screw 505 corresponds to the relative rotation of the two threaded transmission parts 506. This process is to apply tension to the proton exchange membrane. Although the adjusting part is driven to work at this time, no adjusting movement is performed.

[0092] 2. Drive the No. 2 transmission rod 703 to rotate counterclockwise, and when the No. 2 transmission rod 703 rotates counterclockwise, the increasing gear 704 is synchronously driven to rotate, so as to drive the No. 1 transmission rod 7 and the No. 2 gear 7014 to rotate clockwise through the cooperation of the increasing gear 704 and the No. 2 gear 7014. When the No. 1 transmission rod 7 rotates clockwise, the No. 2 bidirectional lead screw 505 is driven to rotate clockwise through the transmission chain 701. The clockwise rotation of the No. 2 bidirectional lead screw 505 corresponds to the opposite movement of the two threaded transmission parts 506. This process releases the tension on the proton exchange membrane and, at the same time, drives the adjustment component to work and perform the adjustment movement at the same time.

[0093] The above-mentioned clockwise and counterclockwise are only used to distinguish the positive and negative directions during the explanation, and are not intended to be limiting features of the present invention.

[0094] The adjusting member in the present invention is used to adjust the position of the increasing gear 704. Due to the different positions of the increasing gear 704, the number of teeth thereof is different, and the angle / number of rotation of the second gear 7014 is different when the increasing gear 704 cooperates with the second gear 7014.

[0095] It should be noted that the above “the teeth have the roller body length as the maximum length and gradually decrease in one direction” means that the teeth of the increasing gear 704 gradually shorten in one direction.

[0096] For example, the increasing gear 704 has ninety teeth, and the stick body is 18 cm, which is gradually shortened in one direction. Then the first tooth is 18 cm, the second tooth is 17.8 cm... the eighty-ninth tooth is 0.4 cm, and the ninetieth tooth is 0.2 cm. Of course, this description is for illustration only and is only for ease of understanding. The specific size shall be subject to actual production and is not specifically limited in this application.

[0097] See also Figure 11 Because the increasing gear 704 has different positions and different numbers of teeth, the angle / number of turns driven by the second gear 7014 are also different.

[0098] The adjusting member includes a screw rod 702 rotatably mounted on one side of the No. 2 transmission rod 703, and a No. 1 follower 705 threadedly engaged with the screw rod 702 is sleeved on the screw rod 702, and the No. 1 follower 705 is also rotatably connected to the increasing gear 704, and the screw rod 702 is connected to the driving member.

[0099] In the embodiment of the present invention, when the driving assembly is working, it drives the screw rod 702 to rotate, so that when the screw rod 702 rotates, the follower 705 and the increasing gear 704 are driven to move axially along the screw rod 702 through the thread engagement with the follower 705 .

[0100] The driving member includes a No. 2 motor 7013 fixed in the assembly slot 201 , and the output shaft of the No. 2 motor 7013 is coaxially fixed with the No. 2 transmission rod 703 .

[0101] A ratchet disc 708 is slidably mounted on the No. 2 transmission rod 703, and the ratchet disc 708 cooperates with the No. 1 limiting strip 7011 fixed on the No. 2 transmission rod 703 through the No. 1 limiting groove 7010 provided on the inner wall. A pawl disc 706 is coaxially fixed on the screw rod 702, and the pawl disc 706 cooperates with the ratchet disc 708 in one direction.

[0102] A third gear 7015 and a first gear 709 are coaxially fixed on the pawl plate 706 and the ratchet plate 708 respectively. The third gear 7015 and the first gear 709 are staggered.

[0103] A second follower 707 is rotatably mounted on the ratchet disc 708 , and the second follower 707 is connected to an electromagnet 7012 mounted in the assembly slot 201 .

[0104] In an embodiment of the present invention, when the No. 2 motor 7013 is working, it drives the No. 2 transmission rod 703 to rotate through its transmission shaft. The rotation of the No. 2 transmission rod 703 corresponds to applying a tensile force to the proton exchange membrane. At this time, the No. 1 limit groove 7010 of the ratchet disk 708 is in the No. 1 limit bar 7011 part, and then when the No. 2 transmission rod 703 rotates, the No. 1 limit bar 7011 and the No. 1 limit groove 7010 cooperate to drive the ratchet disk 708 to rotate. When the ratchet disk 708 rotates, it does not have a transmission relationship with the pawl disk 706, and thus this process only applies a tensile force to the proton exchange membrane.

[0105] The No. 2 transmission rod 703 is driven to rotate in the opposite direction by the No. 2 motor 7013, and at the same time, the No. 1 limit bar 7011 and the No. 1 limit groove 7010 cooperate to drive the ratchet disk 708 to rotate in the opposite direction. When the ratchet disk 708 rotates in the opposite direction, it cooperates with the pawl disk 706 to drive the pawl disk 706 to rotate. When the pawl disk 706 rotates, it drives the screw rod 702 to rotate, so as to drive the No. 1 follower 705 and the incremental gear 704 to perform axial movement of a specified length through the threaded cooperation between the screw rod 702 and the No. 1 follower 705. In this process, the proton exchange membrane is relieved of the tensile force and the position of the incremental gear 704 is adjusted at the same time.

[0106] In the present invention, the forward and reverse rotation angles / number of revolutions of the second transmission rod 703 are the same.

[0107] When the No. 1 follower 705 and the screw rod 702 are threadedly engaged and move to the end of the stroke, the screw rod 702 cannot be driven to rotate in the reverse direction because the ratchet plate 708 and the pawl plate 706 are in one-way engagement.

[0108] The present invention's solution is to use an electromagnet 7012 to drive the second follower 707 to move, thereby driving the ratchet plate 708 and the first gear 709 fixed to the ratchet plate 708 to move synchronously, so that the first limit bar 7011 and the first limit groove 7010 are misaligned. At the same time, the first gear 709 is engaged with the third gear 7015. At this time, driving the first gear 709 or the third gear 7015 to rotate can drive the screw rod 702 to rotate in the opposite direction, and this process does not drive the second transmission rod 703 to rotate. The electromagnet 7012 can also be replaced by an electric push rod 301.

[0109] As an optional embodiment of the present invention, the output shaft of the No. 2 motor 7013 is set to a telescopic shape, and the connection between the No. 2 motor 7013 and the No. 2 transmission rod 703 is used for power transmission through a rectangular plug-in method. Then, the ratchet disk 708 is fixed on the telescopic conveying shaft of the No. 2 motor 7013, and the No. 2 follower 707 is rotationally connected to the telescopic shaft of the No. 2 motor 7013, and is simultaneously connected to the electromagnet 7012.

[0110] During implementation, the electromagnet 7012 drives the No. 2 follower 707 to move, and the No. 2 follower 707 drives the telescopic output shaft of the No. 2 motor 7013 to retract and disengage the power transmission with the No. 2 transmission rod 703. At the same time, the No. 1 gear 709 is engaged with the No. 3 gear 7015. At this time, the No. 2 motor 7013 works to drive the ratchet plate 708 and the No. 1 gear 709 to rotate, and the engagement of the No. 1 gear 709 with the No. 3 gear 7015 drives the pawl plate 706 and the pawl plate 706 to rotate.

[0111] The above two embodiments can be selected according to actual production. Both implementation methods are to independently drive the screw rod 702 to rotate so that the first follower 705 returns from the end of the stroke to the starting end of the stroke.

[0112] Secondly, the pawl plate 706 and the ratchet plate 708 in the present invention are applications of ratchet mechanisms in the prior art. Since they are prior art and relatively mature, they will not be elaborated on in detail here.

[0113] Finally, through the above description, the effect achieved is that by driving the second transmission rod 703 to rotate back and forth, the proton exchange membrane is repeatedly stretched, and the strength of each stretching increases gradually.

[0114] The feedback assembly includes a bracket 3 fixed on the partition plate. A plurality of guide rods 305 are fixed to the bottom of the bracket 3 , and a No. 1 test piece 303 is slidably mounted on the guide rods 305 .

[0115] A second test piece 304 that matches the first test piece 303 is fixed on the carrying plate 2 .

[0116] A plurality of electric push rods 301 are fixed on the bracket 3, and the movable rods of the electric push rods 301 are fixed to the test piece No. 1 303. A processing device 302 is also fixed on the bracket 3, and the processing device 302 is electrically connected to the test piece No. 2 304 and the test piece No. 1 303 through wires.

[0117] In the embodiment of the present invention, when the electric push rod 301 is in operation, it drives the No. 1 test piece 303 to descend and cooperate with the No. 2 test piece 304 to test the proton exchange membrane.

[0118] The present invention also provides a method for detecting the tensile strength of a proton exchange membrane for a fuel cell, which uses the device for detecting the tensile strength of a proton exchange membrane for a fuel cell, comprising the following steps:

[0119] Step 1: Install the proton exchange membrane on the retractable assembly, and use the retractable assembly to reel in and unreel the membrane to continuously provide the proton exchange membrane for stretching testing to the stretching mechanism;

[0120] Step 2: The proton exchange membrane is stretched by the stretching mechanism, and the stretching is repeated in conjunction with the retracting assembly, and the strength of the stretching is gradually increased;

[0121] Step 3: After the proton exchange membrane is stretched, the stretched proton exchange membrane is tested and analyzed through the feedback component, and the test is performed each time it is stretched, thereby obtaining data of the proton exchange membrane when it is stretched to different degrees.

Claims

1. A proton exchange membrane tensile strength testing device for a fuel cell, comprising a testing cabinet (1), wherein the testing cabinet (1) comprises a partition located in the middle, a top box is installed on the top of the partition, and a bottom box is installed on the bottom, characterized in that: Also includes: A movable groove is provided on the partition plate, a bearing plate (2) is slidably mounted in the movable groove, and the bearing plate (2) is connected to a push-pull assembly mounted on one end of the movable groove; A plurality of guide rails (5) fixed on the carrier plate (2), two No. 2 sliders (501) being slidably mounted on the plurality of guide rails (5), a No. 1 fixing member (502) being fixed on each of the two No. 2 sliders (501), a No. 2 fixing member (503) being relatively slidably mounted on the No. 1 fixing member (502), and an anti-slip member (504) being fixed between the No. 1 fixing member (502) and the No. 2 fixing member (503); A retractable assembly, mounted on the two second fixing members (503); A stretching mechanism, mounted on the supporting plate (2), the stretching mechanism being connected to the two first fixing members (502); a feedback assembly mounted on the partition; The retractable assembly comprises a retractable roller (6) detachably mounted on the two second fixing members (503), and a guide member (601) is mounted on the sides of the two retractable rollers (6) facing away from each other; Wherein, the guide member (601) comprises a positioning frame and a plurality of guide rods mounted on the positioning frame; The stretching mechanism comprises two No. 2 bidirectional screws (505) rotatably mounted on the bearing plate (2), both ends of the two No. 2 bidirectional screws (505) are sleeved with threaded transmission members (506) threadedly matched therewith, and the threaded transmission members (506) are connected to the No. 1 fixing member (502) via a tightening member; An assembly groove (201) is provided on the bearing plate (2) along the length direction, a driving assembly is installed in the assembly groove (201), and the driving assembly is connected to the two second bidirectional screws (505); The tightening member includes a mounting member fixed to the bottom of the first fixing member (502), the mounting member is provided with a receiving groove on the side facing the threaded transmission member (506), a guide shaft (507) is fixed in the receiving groove, the guide shaft (507) passes through the threaded transmission member (506) and is slidably connected thereto, and a spring (508) is sleeved on the guide shaft (507); The driving assembly comprises a No. 1 transmission rod (7) rotatably mounted in the assembly groove (201), the No. 1 transmission rod (7) being connected to the two No. 2 bidirectional lead screws (505) via a transmission chain (701), a No. 2 transmission rod (703) being rotatably mounted in the assembly groove (201), an increasing gear (704) being axially slidably mounted on the No. 2 transmission rod (703), and the increasing gear (704) coaxially coaxially fixed to the No. 1 transmission rod (7); An adjusting member connected to the increasing gear (704) is installed on one side thereof, and the second transmission rod (703) is connected to a driving member installed in the assembly groove (201); The teeth of the increasing gear (704) have a maximum length of the roller body and gradually decrease in a single direction; The adjusting member comprises a screw rod (702) rotatably mounted on one side of the second transmission rod (703), a first follower (705) threadedly engaged with the screw rod (702) is sleeved on the screw rod (702), and the first follower (705) is also rotatably connected to the incremental gear (704), and the screw rod (702) is connected to the driving member; The driving member comprises a No. 2 motor (7013) fixed in the assembly slot (201), and the output shaft of the No. 2 motor (7013) is coaxially fixed with the No. 2 transmission rod (703); A ratchet disc (708) is slidably mounted on the second transmission rod (703), and the ratchet disc (708) cooperates with a first limiting strip (7011) fixed on the second transmission rod (703) through a first limiting groove (7010) provided on the inner wall. A pawl disc (706) is coaxially fixed on the screw rod (702), and the pawl disc (706) and the ratchet disc (708) cooperate in a one-way manner. A third gear (7015) and a first gear (709) are coaxially fixed to the ratchet disc (706) and the ratchet disc (708), respectively, and the third gear (7015) and the first gear (709) are staggered. A second follower (707) is rotatably mounted on the ratchet disc (708), and the second follower (707) is connected to an electromagnet (7012) mounted in the assembly slot (201).

2. The proton exchange membrane tensile strength testing device for fuel cells according to claim 1, characterized in that: The push-pull assembly includes a No. 1 bidirectional screw (402) rotatably mounted on the end of the movable groove, both ends of the No. 1 bidirectional screw (402) are sleeved with a threaded sleeve (401) threadedly matched therewith, and a transmission plate (403) is rotatably mounted on the two threaded sleeves (401), the two transmission plates (403) are cross-rotatably connected, and the ends of the two transmission plates (403) away from the threaded sleeve (401) are rotatably mounted with a No. 1 slider (404), and the two No. 1 sliders (404) are slidably connected to the bearing plate (2); A No. 1 motor (4) is also fixed on the partition, and the output shaft of the No. 1 motor (4) is coaxially fixed with the No. 1 bidirectional lead screw (402).

3. The proton exchange membrane tensile strength testing device for fuel cells according to claim 1, characterized in that: The feedback component comprises a bracket (3) fixed on the partition plate, a plurality of guide rods (305) are fixed on the bottom of the bracket (3), and a No. 1 test piece (303) is slidably mounted on the guide rods (305); A second test piece (304) that matches the first test piece (303) is fixed on the bearing plate (2); A plurality of electric push rods (301) are fixed on the bracket (3), and movable rods of the electric push rods (301) are fixed to the No. 1 test piece (303). A processing device (302) is also fixed on the bracket (3), and the processing device (302) is electrically connected to the No. 2 test piece (304) and the No. 1 test piece (303) via wires.

4. A method for detecting the tensile strength of a proton exchange membrane for a fuel cell according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Install the proton exchange membrane on the retractable assembly, and reel in and out the retractable assembly to continuously provide the proton exchange membrane for stretching testing to the stretching mechanism; Step 2: The proton exchange membrane is stretched by the stretching mechanism, and the stretching is repeated in conjunction with the retracting assembly, and the strength of the stretching is gradually increased; Step 3: After the proton exchange membrane is stretched, the stretched proton exchange membrane is tested and analyzed through the feedback component, and the test is performed each time it is stretched, thereby obtaining data of the proton exchange membrane when it is stretched to different degrees.

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