Device and method for detecting tensile strength of proton exchange membrane for fuel cell

Abstract

The invention discloses a device and method for detecting the tensile strength of a proton exchange membrane for a fuel cell, and relates to the related technical field of detection.The device for detecting the tensile strength of the proton exchange membrane for the fuel cell comprises a movable groove formed in a partition plate, and a bearing plate arranged in the movable groove in a sliding mode; the bearing plate is connected with a push-pull assembly installed at one end of the movable groove, the guide rails are fixed to the bearing plate, two second sliding blocks are installed on each guide rail in a sliding mode, first fixing pieces are fixed to the two second sliding blocks, and the first fixing pieces are connected with the push-pull assembly. The continuous stretching test of the proton exchange membrane is realized through the cooperation of the retracting and releasing assembly and the stretching assembly, the stretching force is gradually increased, and the high-precision transmission can be realized through the cooperation of the progressive increase gear and the second gear and then gradual adjustment, so that the stretching force is more accurate.

Description

Technical Field

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

[0002] The proton exchange membrane is a core component of a fuel cell, responsible for conducting protons, isolating gases, and supporting electrodes. Tensile strength refers to the ability of a material to resist fracture under tensile conditions. 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 the proton exchange membrane is as follows. First, mechanical stability. During the operation of a fuel cell, the membrane is affected by pressure and temperature changes. If the tensile strength is insufficient, cracks are likely to occur, leading to gas leakage or short circuits. Secondly, durability. During long-term operation, the repeated expansion and contraction of the membrane may lead to fatigue failure. High tensile strength can delay this process. In addition, during processing in the manufacturing process, such as high-pressure pressing when assembling the membrane electrode, the membrane needs to have sufficient strength to avoid damage.

[0004] For the tensile detection of membranes, a tensile performance detection device for the production of photovoltaic EVA membranes has been disclosed through retrieval, with the publication number: CN222353647U. Existing membrane tensile detection devices include, but are not limited to, the above patent. Most of them achieve stretching through structures such as a motor driving a lead screw or a cylinder. 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 stretching, thereby leading to ambiguity in the pulling amount and unable to obtain accurate values of the membrane. Especially for proton exchange membranes, its slight deviation will directly affect the detection results. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a tensile strength detection device and method for a proton exchange membrane used in a fuel cell, which solves the problem of slight deviation in the tensile value.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A tensile strength detection device for a proton exchange membrane used in a fuel cell, including a detection cabinet, the detection cabinet includes a partition in the middle, a top box is installed on the top of the partition, and a bottom box is installed at the bottom, and further includes: A movable groove is opened on the partition, 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; A plurality of guide rails fixed on the bearing plate, two second sliders are slidably mounted on each of the plurality of guide rails, a first fixing member is fixed on each of the two second sliders, a second fixing member is slidably mounted relative to the first fixing member, and an anti-slip member is fixed between the first fixing member and the second fixing member; A retracting and deploying assembly is mounted on the two second fixing members; A stretching mechanism is mounted on the bearing plate, and the stretching mechanism is connected to the two first fixing members; A feedback assembly is mounted on the partition plate.

[0007] Further, the pushing and pulling assembly includes a first bidirectional lead screw rotatably mounted at the end of the movable groove, threaded sleeves are sleeved at both ends of the first bidirectional lead screw, a transmission plate is rotatably mounted on each of the two threaded sleeves, the two transmission plates are cross-rotatably connected, and a first slider is rotatably mounted at one end of each of the two transmission plates away from the threaded sleeve, and the two first sliders are both slidably connected to the bearing plate; Wherein, a first motor is further fixed on the partition plate, and the output shaft of the first motor is coaxially fixed to the first bidirectional lead screw.

[0008] Further, the retracting and deploying assembly includes a winding roller detachably mounted on the two second fixing members, and a guiding member is mounted on one side of each of the two winding rollers away from each other; Wherein, the guiding member includes a positioning frame and a plurality of guiding rollers mounted on the positioning frame.

[0009] Further, the stretching mechanism includes two second bidirectional lead screws rotatably mounted on the bearing plate, threaded transmission members are sleeved at both ends of the two second bidirectional lead screws, and the threaded transmission members are connected to the first fixing member through a tensioning member; An assembly groove is formed in the bearing plate along the length direction, a driving assembly is mounted in the assembly groove, and the driving assembly is connected to the two second bidirectional lead screws.

[0010] Further, the tensioning member includes a mounting member fixed to the bottom of the first fixing member, a receiving groove is provided on one side of the mounting member facing the threaded transmission member, a guiding shaft is fixed in the receiving groove, the guiding shaft penetrates through the threaded transmission member and is slidably connected thereto, and a spring is sleeved on the guiding shaft.

[0011] Further, the driving assembly includes a first transmission rod rotatably mounted in the assembly groove, the first transmission rod is connected to the two second bidirectional lead screws through a transmission chain, a second transmission rod is rotatably mounted in the assembly groove, an increasing gear is axially slidably mounted on the second transmission rod, and the increasing gear is engaged with a second gear coaxially fixed to the first transmission rod; One side of the increasing gear is provided with an adjusting member connected thereto, and the second transmission rod is connected to a driving member installed in the assembly groove; The teeth of the increasing gear have the maximum length along the length of the roller body and gradually decrease in one direction.

[0012] Further, the adjusting member includes a lead screw rotatably installed on one side of the second transmission rod. A first follower is sleeved on the lead screw and is in threaded cooperation with the lead screw. The first follower is also rotatably connected to the increasing gear, and the lead screw is connected to the driving member.

[0013] Further, The driving member includes a second motor fixed in the assembly groove, and the output shaft of the second motor is coaxially fixed to the second transmission rod; A ratchet disc is slidably installed on the second transmission rod. The ratchet disc is matched with a first limiting strip fixed on the second transmission rod through a first limiting groove opened on the inner wall. A pawl disc is coaxially fixed on the lead screw, and the pawl disc is in one-way cooperation with the ratchet disc; A third gear and a first gear are coaxially fixed on the pawl disc and the ratchet disc respectively. The third gear and the first gear are arranged in a staggered manner; A second follower is rotatably installed on the ratchet disc, and the second follower is connected to an electromagnet installed in the assembly groove.

[0014] Further, The feedback assembly includes a bracket fixed on the partition board. A plurality of guide rods are fixed at the bottom of the bracket, and a first test piece is slidably installed on the guide rods; A second test piece cooperating with the first test piece is fixed on the bearing plate; A plurality of electric push rods are fixed on the bracket. The movable rods of the electric push rods are fixed to the first test piece, and a processing device is also fixed on the bracket. The processing device is electrically connected to the second test piece and the first test piece through wires.

[0015] The present invention also provides a method for detecting the tensile strength of a proton exchange membrane for a fuel cell. Using the device for detecting the tensile strength of a proton exchange membrane for a fuel cell, the method includes the following steps: Step 1: Install the proton exchange membrane on the winding and unwinding assembly, and wind and unwind through the winding and unwinding assembly to continuously provide the proton exchange membrane for tensile detection to the stretching mechanism; Step 2: Stretch the proton exchange membrane through the stretching mechanism, and cooperate with the winding and unwinding assembly to perform repeated stretching, and the stretching strength gradually increases; Step 3: After stretching the proton exchange membrane, use the feedback component to detect and analyze the stretched proton exchange membrane, and perform the detection each time it is stretched, so as to obtain the data of the proton exchange membrane when it is stretched to different degrees.

[0016] The present invention has the following beneficial effects: (1) For the tensile strength detection device of the proton exchange membrane for fuel cells, the push-pull component is used to move the bearing plate towards the direction of the inspection cabinet door, so as to facilitate the installation of the proton exchange membrane onto the winding and unwinding component.

[0017] (2) For the tensile strength detection device of the proton exchange membrane for fuel cells, through the cooperation of the winding and unwinding component and the stretching component, continuous tensile testing of the proton exchange membrane is achieved, and the stretching force gradually increases; Among them, in the present invention, through the cooperation of the increasing gear and the second gear, step-by-step adjustment is carried out, high-precision transmission can be achieved, and the force during stretching is more accurate; Secondly, the tensioning component integrated in the stretching mechanism can tension the proton exchange membrane during the next stretching after each stretching, so as to ensure the accuracy of stretching.

[0018] (3) For the tensile strength detection device of the proton exchange membrane for fuel cells, the feedback component can detect and analyze the proton exchange membrane after each stretching, and obtain the data of the proton exchange membrane under different stretching forces.

[0019] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. Description of the Drawings

[0020] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram inside the detection box of the present invention; Figure 3 is the structural schematic diagram above the partition of the present invention; Figure 4 is the structural schematic diagram of the push-pull component of the present invention; Figure 5 is the exploded view of the stretching mechanism of the present invention; Figure 6 is the structural schematic diagram of the guide shaft and the spring of the present invention; Figure 7 is the cross-sectional view of the bearing plate of the present invention; Figure 8 is the structural schematic diagram inside the assembly groove of the present invention; Figure 9 For the present invention Figure 8 is the enlarged partial structural view of part A; Figure 10 For the present invention Figure 8 Schematic structural diagram from another angle; Figure 11 Schematic structural diagram of the increasing gear in the present invention.

[0021] In the figure: 1, detection cabinet; 2, bearing plate; 201, assembly groove; 3, bracket; 301, electric push rod; 302, processing device; 303, first test piece; 304, second test piece; 305, guide rod; 4, first motor; 401, threaded sleeve; 402, first bidirectional lead screw; 403, drive plate; 404, first slider; 5, guide rail; 501, second slider; 502, first fixing member; 503, second fixing member; 504, anti-slip member; 505, second bidirectional lead screw; 506, threaded transmission member; 507, guide shaft; 508, spring; 6, winding roller; 601, guiding member; 7, first transmission rod; 701, transmission chain; 702, lead screw; 703, second transmission rod; 704, increasing gear; 705, first follower; 706, ratchet pawl disc; 707, second follower; 708, ratchet disc; 709, first gear; 7010, first limiting groove; 7011, first limiting strip; 7012, electromagnet; 7013, second motor; 7014, second gear; 7015, third gear. Specific embodiments

[0022] Next, according to Figures 1 - 11 Describe the tensile strength detection device for proton exchange membranes used in fuel cells provided by the embodiments of the present invention.

[0023] Please refer to Figures 1 - 11 , the embodiments of the present invention provide a technical solution: a tensile strength detection device for proton exchange membranes used in fuel cells, including a detection cabinet 1, a plurality of guide rails 5 fixed on a bearing plate 2, a winding and unwinding assembly installed on two of the second fixing members 503, a stretching mechanism installed on the bearing plate 2, and a feedback assembly. The detection cabinet 1 includes a partition in the middle, a top box is installed on the top of the partition, a bottom box is installed at the bottom, and further includes a movable groove, the movable groove is opened on the partition, a bearing plate 2 is slidably installed in the movable groove, and the bearing plate 2 is connected to a push-pull assembly installed at one end of the movable groove.

[0024] A plurality of guide rails 5 fixed on the bearing plate 2, two second sliders 501 are slidably installed on each of the plurality of guide rails 5, a first fixing member 502 is fixed on each of the two second sliders 501, a second fixing member 503 is slidably installed relative to the first fixing member 502, and an anti-slip member 504 is fixed between the first fixing member 502 and the second fixing member 503. The stretching mechanism is connected to the two first fixing members 502, and the feedback assembly is installed on the partition.

[0025] In an embodiment of the present invention, the sub-exchange membrane is installed on the winding and unwinding assembly. The unwinding and winding of the proton exchange membrane are realized through the winding and unwinding assembly. The two first fixing members 502 and the second fixing member 503 are used to clamp and fix both ends of the test part of the proton exchange membrane. Then, the stretching assembly is used to drive the two first fixing members 502 to move in opposite directions, thereby applying a stretching force to the proton exchange membrane.

[0026] Among them, the function 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, while hydrogen molecules and water molecules cannot pass through.

[0027] When the proton exchange membrane is tested by stretching, the proton exchange membrane will affect the passage of protons when stretched to a certain extent, or the proton exchange membrane will lose the ability to block hydrogen molecules and water molecules when stretched to a certain extent.

[0028] In the present invention, the sliding cooperation between the second slider 501 and the guide rail 5 is used to guide the relative / opposite movement of the two first fixing members 502, and the anti-slip member 504 can prevent the proton exchange membrane from being clamped and slipping during stretching.

[0029] Secondly, when clamping the proton exchange membrane, the second fixing member 503 is driven to move towards the first fixing member 502 to clamp the proton exchange membrane between the first fixing member 502 and the second fixing member 503. The way to drive the second fixing member 503 is not specifically limited in the present invention. Specifically, an electric push rod 301 or a hydraulic cylinder can be used to drive it.

[0030] After applying a stretching force to the sub-exchange membrane, the feedback assembly is used for detection and testing to obtain the data after stretching.

[0031] The push-pull assembly includes a first bidirectional lead screw 402 rotatably installed at the end of the movable groove. Threaded sleeves 401 are sleeved on both ends of the first bidirectional lead screw 402 and are in threaded cooperation with it. Transmission plates 403 are rotatably installed on both threaded sleeves 401. The middle parts of the two transmission plates 403 are cross-rotatably connected, and a first slider 404 is rotatably installed at one end of each of the two transmission plates 403 away from the threaded sleeve 401. Both first sliders 404 are slidably connected to the carrier plate 2. In this embodiment, the threads at both ends of the first bidirectional lead screw 402 have opposite helix directions and the same pitch.

[0032] Among them, a first motor 4 is also fixed on the partition plate, and the output shaft of the first motor 4 is coaxially fixed with the first bidirectional lead screw 402.

[0033] In an embodiment of the present invention, when the first motor 4 operates, its output shaft drives the first bidirectional lead screw 402 to rotate. When the first bidirectional lead screw 402 rotates, through the thread engagement with the two thread sleeves 401, the two thread sleeves 401 are driven to move relatively or in opposite directions. By driving the relative or opposite movement of the two thread sleeves 401, the two drive plates 403 are driven to perform a shearing movement, and then the bearing plate 2 is driven to move towards or away from the door of the detection cabinet 1 by the two first sliders 404.

[0034] Among them, by driving the bearing plate 2 to move towards the door of the detection cabinet 1, it is more convenient to install the proton exchange membrane onto the winding and unwinding assembly.

[0035] The winding and unwinding assembly includes a winding rod 6 detachably installed on two second fixing members 503, and guide members 601 are installed on one side of the two winding rods 6 away from each other.

[0036] Among them, the guide member 601 includes a positioning frame and a plurality of guide rods installed on the positioning frame.

[0037] In an embodiment of the present invention, a winding rod 6 around which the proton exchange membrane is wound is rotatably installed on one of the second fixing members 503. The proton exchange membrane on this second fixing member 503 passes through the two guide members 601 and is then fixed to the winding rod 6 installed on the other second fixing member 503. When the proton exchange membrane passes through the two guide members 601, it is between the second fixing member 503 and the first fixing member 502.

[0038] A motor is installed on one of the second fixing members 503. The output shaft of the motor is coaxially fixed to a winding rod 6 for winding. When the motor operates, it drives the winding rod 6 for winding to rotate, winds the proton exchange membrane, and the corresponding other winding rod 6 unwinds.

[0039] The function of this embodiment is that after the first test is completed, by driving a winding rod 6 for winding to rotate, the first test part is wound onto this winding rod 6. At this time, the proton exchange membrane between the first fixing member 502 and the second fixing member 503 has not been tested, and the second test can be carried out through this part of the proton exchange membrane, and so on, successive test work can be carried out.

[0040] It should be noted that the above-mentioned "detachable connection" in the present invention means that both of the two winding rods 6 can be detached, and when installed on the second fixing member 503, they are rotatably connected to the second fixing member 503, and the implementation method thereof is not specifically limited in the present invention.

[0041] The stretching mechanism includes two second bidirectional lead screws 505 rotatably mounted on the bearing plate 2. Threaded transmission members 506 are sleeved at both ends of the two second bidirectional lead screws 505 and are in threaded cooperation therewith. The threaded transmission members 506 are connected to the first fixing member 502 through tension members. The threads at both ends of the second bidirectional lead screw 505 have opposite helix directions and the same pitch.

[0042] An assembly groove 201 is formed in 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 lead screws 505.

[0043] In the embodiment of the present invention, when the driving assembly works, the two second bidirectional lead screws 505 are driven to rotate synchronously, so as to drive the two threaded transmission members 506 to move relatively / oppositely through the threaded cooperation with the two threaded transmission members 506, and then drive the two first fixing members 502 to move relatively / oppositely through the tension members. When the proton exchange membrane is clamped by the first fixing member 502 and the second fixing member 503, a tensile force will be applied to the proton exchange membrane when the two first fixing members 502 move in opposite directions.

[0044] After the proton exchange membrane is stretched to a specified degree, it is tested by the feedback assembly and the test information is fed back.

[0045] The tension member includes a mounting member fixed to the bottom of the first fixing member 502. A receiving groove is provided on the side of the mounting member facing the threaded transmission member 506. A guide shaft 507 is fixed in the receiving groove. The guide shaft 507 penetrates through the threaded transmission member 506 and is slidably connected thereto. A spring 508 is sleeved on the guide shaft 507.

[0046] In the embodiment of the present invention, when the second bidirectional lead screw 505 rotates, the two threaded transmission members 506 are driven to move oppositely through the threaded cooperation with the threaded transmission members 506. When the two threaded transmission members 506 move oppositely, first, the initial elastic potential energy of the spring 508 is used to drive the mounting member and the first fixing member 502 to move along with the threaded transmission member 506. In this process, the proton exchange membrane clamped by the first fixing member 502 and the second fixing member 503 will be pulled. When the proton exchange membrane is tightened, the continuous 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 first fixing member 502.

[0047] Wherein, a trigger switch is installed on the side of the mounting member facing the threaded transmission member 506. When the threaded transmission member 506 abuts against the mounting member of the first fixing member 502, the trigger switch is pressed. After the trigger switch is pressed, it means that the proton exchange membrane is stretched. After the trigger switch works, the continuous movement of the threaded transmission member 506 will push the first fixing member 502 and the mounting member of the first fixing member 502 to move, thereby applying a tensile force to the proton exchange membrane.

[0048] Through the above-mentioned motion state, ineffective stretching motion can be avoided, ensuring that the proton exchange membrane is under tension after being tightened, and the force received by the proton exchange membrane can be clearly obtained.

[0049] Among them, when the two threaded transmission members 506 move relative to each other and the tension on the proton exchange membrane is released, the elastic potential energy stored when the spring 508 is compressed is released, so that the first fixing member 502 and the mounting member of the first fixing member 502 are reset.

[0050] The driving assembly includes a first driving rod 7 rotatably installed in the assembly groove 201. The first driving rod 7 is connected to two second bidirectional lead screws 505 through a transmission chain 701. A second driving rod 703 is rotatably installed in the assembly groove 201. An increasing gear 704 is axially slidably installed on the second driving rod 703. The increasing gear 704 is engaged with a second gear 7014 coaxially fixed on the first driving rod 7.

[0051] One side of the increasing gear 704 is provided with an adjusting member connected thereto, and the second driving rod 703 is connected to a driving member installed in the assembly groove 201.

[0052] The tooth profile of the increasing gear 704 has the maximum length along the length of the roller body and gradually decreases in one direction.

[0053] In the embodiment of the present invention, a plurality of second transmission strips are circumferentially fixed on the second driving rod 703. Second transmission grooves slidably engaged with the second transmission strips are equidistantly formed on the inner circumference of the increasing gear 704, so that when the second driving rod 703 rotates, the increasing gear 704 can be driven to rotate synchronously through the second transmission strips. At the same time, the increasing gear 704 can axially slide along the second driving rod 703 without affecting the synchronous transmission between the two. That is, the plurality of second transmission strips form an external spline on the outer wall of the second driving rod 703, and the second transmission grooves are provided on the inner wall of the increasing gear 704 to form an internal spline on the inner wall of the increasing gear 704.

[0054] When the driving member works, it drives the second driving rod 703 to rotate. When the second driving rod 703 rotates, the increasing gear 704 is driven to rotate synchronously through the cooperation of the second transmission strips and the second transmission grooves. When the increasing gear 704 rotates, the second gear 7014 and the first driving rod 7 are driven to rotate through the cooperation with the second gear 7014, so that when the first driving rod 7 rotates, the two second bidirectional lead screws 505 are synchronously driven to rotate through the transmission chain 701.

[0055] Among them, the driving member of this embodiment drives the second driving rod 703 to rotate in two opposite directions, and the effects of the two directions are different: 1. Drive the second transmission rod 703 to rotate clockwise. When the second transmission rod 703 rotates clockwise, it drives the increasing gear 704 to rotate clockwise, so as to drive the second gear 7014 and the first transmission rod 7 to rotate counterclockwise through the cooperation of the increasing gear 704 and the second gear 7014. Then, drive the second bidirectional lead screw 505 to rotate counterclockwise through the first transmission rod 7 and the transmission chain 701. The counterclockwise rotation of the second bidirectional lead screw 505 corresponds to the relative rotation of the two threaded transmission parts 506. This process is to apply a tensile force to the proton exchange membrane. Although it drives the adjusting part to work at this time, no adjustment movement is performed.

[0056] 2. Drive the second transmission rod 703 to rotate counterclockwise. When the second transmission rod 703 rotates counterclockwise, it synchronously drives the increasing gear 704 to rotate, so as to drive the first transmission rod 7 and the second gear 7014 to rotate clockwise through the cooperation of the increasing gear 704 and the second gear 7014. When the first transmission rod 7 rotates clockwise, it drives the second bidirectional lead screw 505 to rotate clockwise through the transmission chain 701. The clockwise rotation of the second bidirectional lead screw 505 corresponds to the reverse movement of the two threaded transmission parts 506. This process relieves the tensile force on the proton exchange membrane. At the same time, it drives the adjusting component to work and performs adjustment movement at the same time.

[0057] Among them, the above-mentioned clockwise and counterclockwise are only used to distinguish the positive and negative directions during the description and are not defining features of the present invention.

[0058] The adjusting part 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, its number of teeth is different, and the angle / number of turns that drive the second gear 7014 to rotate when cooperating with the second gear 7014 is different.

[0059] It should be noted that the above-mentioned "the tooth is the longest along the length of the roller body and gradually decreases in one direction" means that the teeth of the increasing gear 704 gradually shorten in one direction.

[0060] For example, if the increasing gear 704 has ninety teeth and the roller body is 18 cm, and it gradually shortens 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 illustrative purposes only and is only for easy understanding. The specific dimensions shall be subject to actual production, and the present application does not make specific limitations.

[0061] Please refer to Figure 11 , due to the different positions of the increasing gear 704, the number of teeth is different, and the angle / number of turns that drive the second gear 7014 to rotate is also different.

[0062] The adjusting member includes a lead screw 702 rotatably mounted on one side of the second transmission rod 703. A first follower 705 that is in threaded engagement with the lead screw 702 is sleeved on the lead screw 702, and the first follower 705 is also rotatably connected to an increasing gear 704. The lead screw 702 is connected to a driving member.

[0063] In an embodiment of the present invention, when the driving assembly operates, it drives the lead screw 702 to rotate, so that when the lead screw 702 rotates, the first follower 705 and the increasing gear 704 are driven to move along the axial direction of the lead screw 702 through the threaded engagement with the first follower 705.

[0064] The driving member includes a second motor 7013 fixed in the assembly groove 201, and the output shaft of the second motor 7013 is coaxially fixed to the second transmission rod 703.

[0065] A ratchet disc 708 is slidably mounted on the second transmission rod 703. The ratchet disc 708 is engaged with a first limiting strip 7011 fixed on the second transmission rod 703 through a first limiting groove 7010 opened on the inner wall. A ratchet pawl disc 706 is coaxially fixed on the lead screw 702, and the ratchet pawl disc 706 is in one-way cooperation with the ratchet disc 708.

[0066] A third gear 7015 and a first gear 709 are coaxially fixed on the ratchet pawl disc 706 and the ratchet disc 708 respectively, and the third gear 7015 and the first gear 709 are arranged in a staggered manner.

[0067] A second follower 707 is rotatably mounted on the ratchet disc 708, and the second follower 707 is connected to an electromagnet 7012 installed in the assembly groove 201.

[0068] In an embodiment of the present invention, when the second motor 7013 operates, it drives the second transmission rod 703 to rotate through its transmission shaft. The rotation of the second transmission rod 703 corresponds to applying a tensile force to the proton exchange membrane. At this time, the first limiting groove 7010 of the ratchet disc 708 is in a part of the first limiting strip 7011. Then, when the second transmission rod 703 rotates, the ratchet disc 708 is driven to rotate through the cooperation between the first limiting strip 7011 and the first limiting groove 7010. When the ratchet disc 708 rotates, there is no transmission relationship with the ratchet pawl disc 706. Therefore, in this process, only a tensile force is applied to the proton exchange membrane.

[0069] Drive the second drive rod 703 to rotate in the reverse direction by the second motor 7013. At the same time, cooperate with each first limiting strip 7011 and the first limiting groove 7010 to drive the ratchet wheel disc 708 to rotate in the reverse direction. When the ratchet wheel disc 708 rotates in the reverse direction, cooperate with the pawl disc 706 to drive the pawl disc 706 to rotate. When the pawl disc 706 rotates, drive the lead screw 702 to rotate, so as to drive the first follower 705 and the increasing gear 704 to perform an axial movement of a specified length through the thread fit between the lead screw 702 and the first follower 705. In this process, the tensile force on the proton exchange membrane is released and the position of the increasing gear 704 is adjusted simultaneously.

[0070] Among them, in the present invention, the forward and reverse rotation angles / revolutions of the second drive rod 703 are the same.

[0071] When the first follower 705 moves to the end of the stroke in the thread fit with the lead screw 702, since the ratchet wheel disc 708 and the pawl disc 706 are in one-way cooperation, the lead screw 702 cannot be driven to rotate in the reverse direction.

[0072] The solution of the present invention is to drive the second follower 707 to move through the electromagnet 7012, so as to drive the ratchet wheel disc 708 and the first gear 709 fixed on the ratchet wheel disc 708 to move synchronously through the second follower 707, so that the first limiting strip 7011 and the first limiting groove 7010 are misaligned. At the same time, the first gear 709 meshes with the third gear 7015. At this time, driving the first gear 709 or the third gear 7015 to rotate can drive the lead screw 702 to rotate in the reverse direction, and this process will not drive the second drive rod 703 to rotate. The electromagnet 7012 can also be replaced by an electric push rod 301.

[0073] As an optional embodiment of the present invention, the output shaft of the second motor 7013 is set to be telescopic, and the connection between the second motor 7013 and the second drive rod 703 performs power transmission through a rectangular plug-in connection. Then, the ratchet wheel disc 708 is fixed on the telescopic output shaft of the second motor 7013, and the second follower 707 is rotationally connected to the telescopic shaft of the second motor 7013 and is simultaneously connected to the electromagnet 7012.

[0074] During implementation, drive the second follower 707 to move through the electromagnet 7012, drive the telescopic output shaft of the second motor 7013 to retract and disconnect the power transmission from the second drive rod 703 through the second follower 707. At the same time, the first gear 709 meshes with the third gear 7015. At this time, when the second motor 7013 works, it drives the ratchet wheel disc 708 and the first gear 709 to rotate, and drives the pawl disc 706 and the pawl disc 706 to rotate through the meshing of the first gear 709 and the third gear 7015.

[0075] The above two embodiments can be selected according to actual production. The implementation methods of both are to separately 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.

[0076] Secondly, the ratchet pawl disc 706 and the ratchet wheel disc 708 in the present invention are the applications of the ratchet mechanism in the prior art. Since they are in the prior art and are relatively mature, no specific elaboration will be made here.

[0077] Finally, through the above description, the achieved effect is that by driving the reciprocating rotation of the second transmission rod 703, the repeated stretching of the proton exchange membrane is realized, and the stretching force increases each time.

[0078] The feedback component includes a bracket 3 fixed to the partition plate. A plurality of guide rods 305 are fixed to the bottom of the bracket 3, and a first test piece 303 is slidably mounted on the guide rods 305.

[0079] A second test piece 304 cooperating with the first test piece 303 is fixed on the bearing plate 2.

[0080] A plurality of electric push rods 301 are fixed on the bracket 3. The movable rod of the electric push rod 301 is fixed to the first test piece 303, and a processing device 302 is also fixed on the bracket 3. The processing device 302 is electrically connected to the second test piece 304 and the first test piece 303 through wires.

[0081] In the embodiment of the present invention, when the electric push rod 301 works, it drives the first test piece 303 to descend and cooperate with the second test piece 304 to detect the proton exchange membrane.

[0082] The present invention also provides a method for detecting the tensile strength of a proton exchange membrane for a fuel cell, using the device for detecting the tensile strength of a proton exchange membrane for a fuel cell, including the following steps: Step 1: Install the proton exchange membrane on the winding and unwinding component, and wind and unwind through the winding and unwinding component to continuously provide the proton exchange membrane for tensile detection to the stretching mechanism; Step 2: Perform stretching treatment on the proton exchange membrane through the stretching mechanism, and cooperate with the winding and unwinding component for repeated stretching, and the stretching strength gradually increases; Step 3: After stretching the proton exchange membrane, detect and analyze the stretched proton exchange membrane through the feedback component, and perform detection each time stretching is performed, so as to obtain the data of the proton exchange membrane when it is stretched to different degrees.

Claims

1. Tensile strength detection device for proton exchange membrane used in fuel cell, comprising a detection cabinet (1), wherein the detection cabinet (1) includes a partition plate located in the middle, a top box is installed on the top of the partition plate, and a bottom box is installed at the bottom, and it is characterized in that, It further includes: An activity slot is opened on the partition board. A carrier plate (2) is slidably installed in the activity slot, and the carrier plate (2) is connected to a push-pull assembly installed at one end of the activity slot; A plurality of guide rails (5) fixed on the carrier plate (2). Two second sliders (501) are slidably installed on each of the plurality of guide rails (5). A first fixing member (502) is fixed on each of the two second sliders (501). A second fixing member (503) is slidably installed relative to the first fixing member (502). An anti-slip member (504) is fixed between the first fixing member (502) and the second fixing member (503); A retracting and releasing assembly is installed on the two second fixing members (503); A stretching mechanism is installed on the carrier plate (2), and the stretching mechanism is connected to the two first fixing members (502); A feedback assembly is installed on the partition board.

2. The tensile strength detection device for the proton exchange membrane used in a fuel cell according to claim 1, wherein: The push-pull assembly includes a first bidirectional lead screw (402) rotatably installed at the end of the activity slot. Threaded sleeves (401) that are threadedly engaged therewith are sleeved at both ends of the first bidirectional lead screw (402). A transmission plate (403) is rotatably installed on each of the two threaded sleeves (401). The two transmission plates (403) are cross-rotatably connected, and a first slider (404) is rotatably installed at one end of each of the two transmission plates (403) away from the threaded sleeve (401). The two first sliders (404) are both slidably connected to the carrier plate (2); Among them, a first motor (4) is further fixed on the partition board, and the output shaft of the first motor (4) is coaxially fixed to the first bidirectional lead screw (402).

3. The tensile strength detection device for a proton exchange membrane used in a fuel cell according to claim 1, wherein: The retracting and releasing assembly includes a winding rod (6) detachably installed on the two second fixing members (503). Guide members (601) are installed on one side of the two winding rods (6) away from each other; Among them, the guide member (601) includes a positioning frame and a plurality of guide rods installed on the positioning frame.

4. The tensile strength detection device for a proton exchange membrane used in a fuel cell according to claim 3, characterized in that: The stretching mechanism includes two second bidirectional lead screws (505) rotatably installed on the carrier plate (2). Threaded transmission members (506) that are threadedly engaged therewith are sleeved at both ends of the two second bidirectional lead screws (505). The threaded transmission member (506) is connected to the first fixing member (502) through a tensioning member; An assembly groove (201) is opened on the carrier 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 lead screws (505).

5. The tensile strength detection device for a proton exchange membrane used in a fuel cell according to claim 4, characterized in that: The tensioning member includes a mounting member fixed to the bottom of the first fixing member (502). A receiving groove is provided on one side of the mounting member facing the threaded transmission member (506). A guide shaft (507) is fixed in the receiving groove. The guide shaft (507) penetrates through the threaded transmission member (506) and is slidably connected thereto. A spring (508) is sleeved on the guide shaft (507).

6. The tensile strength detection device for a proton exchange membrane used in a fuel cell according to claim 5, wherein: The driving component includes a first transmission rod (7) rotatably installed in the assembly groove (201). The first transmission rod (7) is connected to two second bidirectional lead screws (505) through a transmission chain (701). A second transmission rod (703) is rotatably installed in the assembly groove (201). An increasing gear (704) is axially slidably installed on the second transmission rod (703). The increasing gear (704) cooperates with a second gear (7014) coaxially fixed on the first transmission rod (7). One side of the increasing gear (704) is provided with an adjusting member connected thereto. 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 the maximum length along the length of the roller body and gradually decrease in one direction.

7. The tensile strength detection device for a proton exchange membrane used in a fuel cell according to claim 6, characterized in that: The adjusting member includes a lead screw (702) rotatably installed on one side of the second transmission rod (703). A first follower (705) threadedly engaged with the lead screw (702) is sleeved on the lead screw (702). The first follower (705) is also rotatably connected to the increasing gear (704). The lead screw (702) is connected to the driving member.

8. The tensile strength detection device for a proton exchange membrane used in a fuel cell according to claim 7, wherein: The driving member includes a second motor (7013) fixed in the assembly groove (201). The output shaft of the second motor (7013) is coaxially fixed to the second transmission rod (703). A ratchet disc (708) is slidably installed on the second transmission rod (703). The ratchet disc (708) cooperates with a first limiting strip (7011) fixed on the second transmission rod (703) through a first limiting groove (7010) formed in the inner wall. A ratchet pawl disc (706) is coaxially fixed on the lead screw (702). The ratchet pawl disc (706) is in one-way cooperation with the ratchet disc (708). A third gear (7015) and a first gear (709) are coaxially fixed on the ratchet pawl disc (706) and the ratchet disc (708) respectively. The third gear (7015) and the first gear (709) are arranged in a staggered manner. A second follower (707) is rotatably installed on the ratchet disc (708). The second follower (707) is connected to an electromagnet (7012) installed in the assembly groove (201).

9. The tensile strength detection device for a proton exchange membrane used in a fuel cell according to claim 4, characterized in that: The feedback component includes a bracket (3) fixed on the partition plate. A plurality of guide rods (305) are fixed at the bottom of the bracket (3). A first test piece (303) is slidably installed on the guide rods (305). A second test piece (304) cooperating with 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). The movable rod of the electric push rod (301) is fixed to the first test piece (303). A processing device (302) is also fixed on the bracket (3). The processing device (302) is electrically connected to the second test piece (304) and the first test piece (303) through wires.

10. A detection method for a fuel cell proton exchange membrane tensile strength detection device according to any one of claims 1-9, characterized in that: Including the following steps: Step 1: Install the proton exchange membrane on the retractable assembly, and reel in and out the proton exchange membrane through the retractable assembly to continuously provide the stretching mechanism with the proton exchange membrane for stretching detection; Step 2: The proton exchange membrane is stretched by the stretching mechanism, and the stretching is repeated in cooperation with the retracting and releasing 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 a feedback component, and the test is performed each time the proton exchange membrane is stretched, thereby obtaining data of the proton exchange membrane when it is stretched to different degrees.

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