Fuel cell diffusion layer feeding device with adjustable adsorption force

Abstract

The invention relates to the technical field of fuel cell automatic production equipment, in particular to an adsorption-force-adjustable fuel cell diffusion layer feeding device which comprises a mounting support and a plurality of suction assemblies. A friction assembly, a driving mechanism and a plurality of sliding rails are arranged on the mounting bracket; the driving mechanism is configured to drive the friction assembly to extend outwards to abut against the diffusion layer and drive the suction assembly to slide outwards along the sliding rail to apply tensile force to the diffusion layer, and the originally loose and flexible diffusion layer is leveled and tightened towards the periphery through the arrangement of the suction assembly and the friction assembly. The mechanical property of the flexible breathable material is instantly hardened into a rigid plane with pretension, so that the static friction force and the normal constraint force between the diffusion layer and the suction cup are increased, and the problem that the flexible breathable material is easy to wrinkle and slip in the high-speed transfer process of a robot is solved.

Description

Technical Field

[0001] This invention relates to the field of automated fuel cell production equipment technology, specifically to a fuel cell diffusion layer feeding device with adjustable adsorption force. Background Technology

[0002] In the production of fuel cell membrane electrode (MEA), the gas diffusion layer (GDL, usually carbon paper) is a key basic material. Because the diffusion layer is a porous, permeable, and fragile sheet material, and its surface is usually coated with a microporous layer (MPL), its gripping and transfer process has always been a challenge for automation.

[0003] Existing technology, such as Chinese Patent Publication No. CN212412092U, discloses a gas diffusion layer cutting device for fuel cell membrane electrode assemblies. This device employs a carbon paper feeding mechanism, whose suction components include a suction cup frame and Bernoulli suction cups. Specifically, the suction cup frame includes an X-shaped frame part one and a frame part two, with multiple Bernoulli suction cups fixedly disposed below the four ends of the X-shaped frame and below the center of the frame part two. This technical solution utilizes Bernoulli's principle to achieve contactless adsorption of porous carbon paper. By using multi-point distributed fixed suction cups, it solves to some extent the problem of low efficiency in manual feeding and attempts to prevent the carbon paper from bending at the edges and corners and sinking in the middle through multi-point adsorption.

[0004] However, in actual high-speed automated production lines, relying solely on Bernoulli's pneumatic adsorption is insufficient to resist the inertial forces during high-speed transfer. Due to the high permeability of the diffusion layer, generating sufficient adsorption force to resist the enormous inertial forces during sudden stops or high-speed turns of the robotic arm requires a significant increase in compressed air flow or pressure. This not only leads to high energy consumption, but the strong airflow can also easily damage the fragile microporous layer or cause localized adsorption perforation. Conversely, if the airflow is reduced to protect the material, the lateral constraint force between the suction cup and the diffusion layer will be insufficient, causing material slippage or aerodynamic vibration during transport, thus reducing the positioning accuracy of the unloading and failing to meet the demands of high-cycle production. Furthermore, fixed multi-point adsorption cannot eliminate wrinkles in the material itself. When adsorbing diffusion layers with poor surface flatness or those already slightly wrinkled during stacking, the fixed-position suction cup can only lift the diffusion layer in its original shape, unable to stretch and flatten it. This results in the diffusion layer retaining wrinkles when placed at the cutting or hot-pressing station, severely affecting the bonding quality and electrochemical performance of the membrane electrode. Summary of the Invention

[0005] To address the aforementioned issues, a fuel cell diffusion layer feeding device with adjustable adsorption force is provided. By setting up suction components and friction components, the originally loose and flexible diffusion layer is stretched and tightened in all directions, instantly hardening it into a rigid plane with pre-tension in terms of mechanical properties. This increases the static friction and normal constraint force between the diffusion layer and the suction cup, solving the problem of flexible breathable materials being prone to wrinkling and slippage during high-speed robot transfer.

[0006] To address the problems of existing technologies, this invention provides a fuel cell diffusion layer feeding device with adjustable adsorption force, comprising a mounting bracket and multiple suction components disposed on the mounting bracket; the mounting bracket is provided with multiple radially extending slide rails; the suction components are configured to perform expansion or contraction movements along the corresponding slide rails; the mounting bracket is also provided with friction components and a driving mechanism; the friction components are configured to perform extension or retraction movements in the vertical direction; the driving mechanism is located above the friction components, and both the suction components and the friction components are drively connected to the driving mechanism; the driving mechanism is configured to drive the friction components to extend outward to abut against the diffusion layer, and drive the suction components to slide outward along the slide rails to apply tension force to the diffusion layer.

[0007] Preferably, the driving mechanism includes a linear actuator and a driving frame disposed on the top of the mounting bracket and capable of sliding along the vertical direction of the mounting bracket; a plurality of driving rods are disposed on the periphery of the driving frame, the number of driving rods corresponding to the number of suction components; the suction components and the driving rods are hingedly connected by connecting rods.

[0008] Preferably, the suction assembly includes a mounting block slidably disposed on the slide rail, the mounting block having a groove extending along the slide rail; one end of the connecting rod is hinged to the drive rod, and the other end is slidably disposed in the groove; a reset elastic element is connected between the mounting block and the mounting bracket; the reset elastic element is configured to apply an inward biasing force to the mounting block, such that during the initial stage of the drive frame moving downward, the mounting block remains stationary, while the connecting rod slides relative to the drive rod within the groove.

[0009] Preferably, the slide rail is further provided with an adjusting seat that slides with it, the two ends of the reset elastic member are respectively connected to the mounting block and the adjusting seat, and the bottom of the adjusting seat is provided with a locking member that fixes it to different positions on the slide rail.

[0010] Preferably, a support frame is provided below the drive frame, and a plurality of guide rods are fixedly connected to the support frame. The guide rods are slidably sleeved on the drive frame and pass through the mounting bracket. The friction assembly includes a friction pad fixedly connected to the bottom of the guide rod. A buffer spring is sleeved on the guide rod, and the two ends of the buffer spring are respectively connected to the drive frame and the support frame. The drive frame is configured to drive the support frame and the friction pad to move downward synchronously during the downward movement through the buffer spring.

[0011] Preferably, the support frame is configured to make a limiting contact with the mounting bracket, and the vertical distance between the support frame and the mounting bracket is configured to be less than the maximum relative sliding distance of the connecting rod in the slide groove; so that after the friction pad moves to a set depth and stops descending, the drive frame continues to move down to compress the buffer spring, and simultaneously drives the connecting rod to eliminate the remaining slide groove stroke, so as to push the mounting block to slide along the slide rail.

[0012] Preferably, the suction assembly further includes a suction cup body; the top of the suction cup body is provided with a universal ball head, and the suction cup body is rotatably connected to the underside of the mounting block through the universal ball head to adaptively conform to the surface of the diffusion layer.

[0013] Preferably, the contact surface of the friction pad is made of a porous foamed polymer material, and the surface of the friction pad is provided with an anti-slip texture.

[0014] Preferably, the mounting bracket is further provided with a sensor; the drive mechanism is electrically connected to the sensor and configured to adjust the output pressure of the drive mechanism according to the suspension height of the diffusion layer or the acceleration signal during movement.

[0015] Preferably, the linear actuator is a cylinder or linear motor with adjustable stroke; by adjusting the extension stroke length of the linear actuator, the displacement of the connecting rod driving the mounting block to slide outward along the slide rail is controlled, thereby achieving stepless adjustment of the tension of the diffusion layer.

[0016] The advantages of this invention compared to the prior art are:

[0017] 1. This invention, through the arrangement of the suction and friction components, stretches and tightens the originally loose and flexible diffusion layer in all directions, instantly hardening it into a rigid plane with pre-tension in terms of mechanical properties. This adjustment of tension increases the static friction and normal constraint force between the diffusion layer and the suction cup, thus macroscopically manifesting as adjustable material adsorption and gripping capabilities of the device. It effectively solves the problems of wrinkling and slippage of flexible breathable materials during high-speed robotic transfer, ensuring the flatness and positional accuracy of the diffusion layer at the material feeding location.

[0018] 2. This invention uses a single linear actuator in conjunction with a connecting rod to simultaneously convert the vertical unidirectional motion of the drive source into the lifting motion of the friction assembly and the horizontal expansion motion of the suction assembly. This not only reduces hardware costs but also ensures absolute synchronization of the actions of the four suction components from a purely mechanical structure perspective. Furthermore, by creating a sliding groove on the mounting block and incorporating a reset elastic element, a hardware delay mechanism for the mechanical transmission is constructed. This ensures that the suction cup remains stationary during the initial downward movement of the drive frame, thus reserving a time window for the manually set action sequence. This guarantees that the friction assembly must first descend and complete its anchoring before the suction assembly begins its expansion, completely eliminating the risk of material being pulled away instead of straightened due to timing discrepancies at the physical level.

[0019] 3. This invention introduces a universal ball joint structure between the suction cup body and the mounting block, giving the suction cup body a slight angle self-adaptive capability, enabling it to automatically find the optimal fitting angle, maintain a stable negative pressure airflow field, and prevent material falling accidents caused by local air leakage. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of a fuel cell diffusion layer feeding device with adjustable adsorption force when it absorbs the diffusion layer.

[0021] Figure 2 This is a front view of a fuel cell diffusion layer feeding device with adjustable adsorption force when it is absorbing the diffusion layer.

[0022] Figure 3 This is a top view of a fuel cell diffusion layer feeding device with adjustable adsorption force when it is absorbing the diffusion layer.

[0023] Figure 4 This is a three-dimensional structural diagram of a fuel cell diffusion layer feeding device with adjustable adsorption force.

[0024] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0025] Figure 6 yes Figure 4 Enlarged view of point B in the middle.

[0026] Figure 7 This is a three-dimensional structural diagram of the adsorption component in a fuel cell diffusion layer feeding device with adjustable adsorption force.

[0027] Figure 8 This is a three-dimensional structural diagram of the mounting bracket and suction assembly in a fuel cell diffusion layer feeding device with adjustable adsorption force. Figure 1 .

[0028] Figure 9 This is a three-dimensional structural diagram of the mounting bracket and suction assembly in a fuel cell diffusion layer feeding device with adjustable adsorption force. Figure 2 .

[0029] Figure 10 This is an exploded view of a fuel cell diffusion layer feeding device with adjustable adsorption force.

[0030] The following are the labels in the diagram: 1. Mounting bracket; 11. Slide rail; 111. Adjusting seat; 1111. Locking element; 12. Suction assembly; 121. Mounting block; 1211. Slide groove; 122. Reset elastic element; 123. Suction cup body; 1231. Universal ball head; 13. Friction assembly; 131. Support frame; 1311. Guide rod; 1312. Friction pad; 1313. Buffer spring; 14. Drive mechanism; 141. Linear actuator; 142. Drive frame; 1421. Connecting rod; 1422. Drive rod; 2. Diffusion layer. Detailed Implementation

[0031] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0032] like Figures 1 to 5 and Figure 10 As shown: A fuel cell diffusion layer feeding device with adjustable adsorption force includes a mounting bracket 1 and a plurality of suction components 12 disposed on the mounting bracket 1; the mounting bracket 1 is provided with a plurality of radially extending slide rails 11; the suction components 12 are configured to perform expansion or contraction movements along the corresponding slide rails 11; the mounting bracket 1 is also provided with a friction component 13 and a drive mechanism 14; the friction component 13 is configured to perform extension or retraction movements in the vertical direction; the drive mechanism 14 is located above the friction component 13, and the suction components 12 and the friction components 13 are both drively connected to the drive mechanism 14; the drive mechanism 14 is configured to drive the friction component 13 to extend outward to abut against the diffusion layer 2, and drive the suction component 12 to slide outward along the slide rails 11 to apply tension force to the diffusion layer 2.

[0033] In existing technologies, for porous, permeable, and flexible sheet materials like the gas diffusion layer 2 in fuel cells, the adsorption force is typically changed solely by adjusting the negative pressure of the vacuum generator. However, due to the high permeability of the diffusion layer 2, simply increasing the negative pressure not only leads to high energy consumption but also easily causes localized adsorption breakdown or aerodynamic flutter during high-speed transfer. This embodiment proposes a fully mechanical tension-type adsorption force adjustment logic. The device mainly consists of a mounting bracket 1, a radially sliding suction component 12 (such as a Bernoulli suction cup), a centrally adjustable friction component 13, and a drive mechanism 14. During operation, the drive mechanism 14 first drives the central friction component 13 to extend along the height direction of the mounting bracket 1, using friction to press the central area of ​​the diffusion layer 2 onto the worktable, thereby establishing an anchor point; then, the drive mechanism 14 drives the surrounding suction components 12 to expand outward along the slide rails 11. Since the center has been anchored, the outward expansion of the suction components 12 will pull the loose diffusion layer 2 flat and tighten it in all directions. This tension causes the originally flexible carbon paper to harden instantly in terms of mechanical properties, turning it into a rigid plane with pre-tension.

[0034] This invention is not limited to the traditional adjustment of vacuum negative pressure, but introduces a mechanical tensioning mechanism. It should be noted that the adsorption force described in this invention refers to the overall holding force of the device on the diffusion layer 2. By adjusting the tension of the diffusion layer 2, the static friction force (preventing horizontal slippage) and normal constraint force (preventing vertical vibration) between the diffusion layer 2 and the suction cup are effectively increased, thus macroscopically manifesting as an adjustable ability of the device to adsorb and grasp materials. This design effectively solves the problem of wrinkling and slippage of flexible breathable materials during high-speed robotic transfer, ensuring the flatness and positional accuracy of the diffusion layer 2 at the material feeding position.

[0035] like Figures 1 to 4 , Figures 8 to 10 As shown: The drive mechanism 14 includes a linear actuator 141 and a drive frame 142 disposed on the top of the mounting bracket 1 and capable of sliding along the vertical direction of the mounting bracket 1; a plurality of drive rods 1422 are disposed on the periphery of the drive frame 142, and the number of drive rods 1422 corresponds to the number of suction components 12; the suction components 12 and the drive rods 1422 are hingedly connected by a connecting rod 1421.

[0036] To achieve the combined action of the suction component 12 and the friction component 13, existing technologies may require multiple sets of motors to drive them separately, resulting in a heavy end effector, complex control, and difficulty in ensuring synchronization. As a preferred embodiment of the present invention, a single linear actuator 141 is used in conjunction with a connecting rod 1421 to achieve the combined drive. Specifically, the linear actuator 141 drives a drive frame 142 to perform vertical reciprocating motion on the mounting bracket 1. Multiple drive rods 1422 are arranged around the periphery of the drive frame 142, and each drive rod 1422 is hinged to the suction component 12 on the slide rail 11 via an inclined connecting rod 1421. Thus, when the drive frame 142 moves downward, the angle of the connecting rod 1421 gradually flattens, causing the connecting rod 1421 to apply a horizontal outward thrust to the suction component 12, forcing the suction component 12 to slide outward along the slide rail 11; conversely, when the drive frame 142 moves upward, the connecting rod 1421 pulls the suction component 12 inward. This transforms the vertical unidirectional motion of the drive source into the lifting motion of the friction component 13 and the horizontal expansion motion of the suction component 12, thereby reducing the hardware cost and complexity of the control system. It also ensures the absolute synchronicity of the actions of multiple suction components 12 around the device from a purely mechanical perspective, avoiding the risk of asynchrony caused by multi-motor control.

[0037] like Figures 4 to 10 As shown: The suction assembly 12 includes a mounting block 121 slidably disposed on the slide rail 11, and the mounting block 121 has a groove 1211 disposed along the extension direction of the slide rail 11; one end of the connecting rod 1421 is hinged to the drive rod 1422, and the other end is slidably disposed in the groove 1211; a reset elastic element 122 is connected between the mounting block 121 and the mounting bracket 1; the reset elastic element 122 is configured to apply an inward biasing force to the mounting block 121, so that in the initial stage of the drive frame 142 moving downward, the mounting block 121 remains stationary, while the connecting rod 1421 slides relative to the drive rod 1421 in the groove 1211.

[0038] When the drive frame 142 descends, the connecting rod 1421 immediately pushes the suction cup outward. At this time, the central friction component 13 may not yet have contacted the diffusion layer 2, which will cause the diffusion layer 2 to be pulled away directly instead of straightened. To solve this problem, this embodiment has a groove 1211 along the direction of the slide rail 11 on the mounting block 121 of the suction component 12. The end pin of the connecting rod 1421 is not fixed to the mounting block 121, but is slidably disposed in the groove 1211. At the same time, a reset elastic element 122 is provided between the mounting block 121 and the bracket. In the initial stage of the drive frame 142 moving downward, although the connecting rod 1421 will push outward, the mounting block 121 remains stationary due to the pulling force of the reset elastic element 122. At this time, the pin of the connecting rod 1421 is just running in the groove 1211, which is the idle stroke. This stage not only does not consume driving force, but also reserves a time window for the manually set action sequence.

[0039] By creating a groove 1211 on the mounting block 121 and using a reset elastic element 122, a hardware delay device for the mechanical transmission is constructed. This allows the suction cup to remain stationary during the initial downward movement of the drive frame 142, thus providing crucial time for the friction assembly 13 to descend first and complete its anchoring action. This ensures that the timing logic of starting the friction assembly 13 first and then driving the suction assembly 12 is realized at the mechanical level.

[0040] like Figures 4 to 10 As shown: The slide rail 11 is also provided with an adjusting seat 111 that slides with it. The two ends of the reset elastic member 122 are respectively connected to the mounting block 121 and the adjusting seat 111. The bottom of the adjusting seat 111 is provided with a locking member 1111 that fixes it to different positions on the slide rail 11.

[0041] For diffusion layers 2 of different sizes and specifications, the initial gripping position of the suction cup needs to be adjusted. In this embodiment, a movable adjusting seat 111 is provided on the slide rail 11. One end of the reset elastic element 122 is hung on the mounting block 121, and the other end is hung on this adjusting seat 111. The bottom of the adjusting seat 111 is provided with a locking element 1111, which can fix it at any position on the slide rail 11. When the operator moves the adjusting seat 111 and locks it, the anchor point position of the reset elastic element 122 is actually changed, thereby forcing the mounting block 121 to stay in the new initial position, thus changing the initial opening diameter of the suction cup.

[0042] The user can easily adjust the initial position of the suction assembly 12 using the movable and lockable adjustment seat 111. This allows the same tooling to be quickly adapted to diffusion layers 2 of different sizes and specifications without replacing the entire end fixture, improving the equipment's versatility, changeover efficiency, and economy.

[0043] like Figures 4 to 10As shown: A support frame 131 is provided below the drive frame 142. A plurality of guide rods 1311 are fixedly connected to the support frame 131. The guide rods 1311 are slidably sleeved on the drive frame 142 and pass through the mounting bracket 1. The friction assembly 13 includes a friction pad 1312 fixedly connected to the bottom of the guide rod 1311. A buffer spring 1313 is sleeved on the guide rod 1311. The two ends of the buffer spring 1313 are respectively connected to the drive frame 142 and the support frame 131. The drive frame 142 is configured to drive the support frame 131 and the friction pad 1312 to move downward synchronously during the downward movement through the buffer spring 1313.

[0044] To prevent rigid actuation from damaging the fragile microporous layer 2 of the diffusion layer, the friction assembly 13 must possess flexible contact capability. In this embodiment, a floating support frame 131 is provided below the drive frame 142. The support frame 131 is fitted onto the drive frame 142 via a guide rod 1311, and the friction pad 1312 is fixed to the bottom of the guide rod 1311. A buffer spring 1313 on the guide rod 1311 is used to clamp the drive frame 142 and the support frame 131. When the drive frame 142 moves downward, it pushes the support frame 131 and the friction pad 1312 downward by compressing the buffer spring 1313. When the friction pad 1312 contacts the surface of the diffusion layer 2, it stops descending. At this time, the drive mechanism 14 does not stop but continues to descend. This continued downward movement is absorbed by the compression deformation of the buffer spring 1313, thereby achieving flexible decoupling between the drive source and the execution end. This allows the friction pad 1312 to stop automatically after contacting the diffusion layer 2 without damaging the drive mechanism 14 due to overload. On the other hand, by utilizing the linear characteristics of the buffer spring 1313, position control is converted into pressure control, applying a constant and gentle clamping force to the center of the diffusion layer 2, effectively protecting the fragile microporous layer structure on the diffusion layer 2.

[0045] like Figures 4 to 10 As shown: The support frame 131 is configured to make a limiting contact with the mounting bracket 1, and the vertical distance between the support frame 131 and the mounting bracket 1 is configured to be less than the maximum relative sliding distance of the connecting rod 1421 in the slide groove 1211; so that after the friction pad 1312 moves to a set depth and stops descending, the drive frame 142 continues to move down to compress the buffer spring 1313, and simultaneously drives the connecting rod 1421 to eliminate the remaining slide groove 1211 stroke, so as to push the mounting block 121 to slide along the slide rail 11.

[0046] This embodiment aims to lock the timing of anchoring followed by tensioning through a mechanical structure. The vertical distance between the support frame 131 and the mounting bracket 1 must be less than the maximum free travel distance of the connecting rod 1421 within the slide groove 1211. When the drive frame 142 descends, the friction pad 1312 contacts and presses against the diffusion layer 2. At this time, the connecting rod 1421 is still running free within the slide groove 1211, and the suction cup remains stationary. Then, the drive frame 142 continues to descend, compressing the buffer spring 1313 to maintain the clamping force. Simultaneously, the connecting rod 1421 completes its free travel within the slide groove 1211, and the pin reaches the end of the slide groove 1211. Finally, the drive frame 142 continues to descend, forcibly pushing the suction cup outward to complete the tensioning.

[0047] By setting the stroke difference, an irreversible action logic chain is constructed at the mechanical level. This ensures that the friction pad 1312 must first contact and press against the center of the diffuser layer 2 to establish a fulcrum before the suction cup begins to stretch outward. From a physical perspective, this completely eliminates timing errors caused by electrical control delays or air circuit response errors, and avoids the risk of the diffuser layer 2 being torn or dragged as a whole due to not being anchored.

[0048] like Figures 4 to 10 As shown: The suction assembly 12 also includes a suction cup body 123; the top of the suction cup body 123 is provided with a universal ball head 1231, and the suction cup body 123 is rotatably connected to the underside of the mounting block 121 through the universal ball head 1231 to adaptively fit the surface of the diffusion layer 2.

[0049] During stacking or transport, the surface of the diffusion layer 2 often exhibits slight undulations. If the suction cup body 123 is rigidly connected to it, the bottom surface of the suction cup body 123 may not be parallel to the surface of the diffusion layer 2, resulting in air leakage or uneven adsorption force. This embodiment introduces a universal ball joint 1231 structure between the suction cup body 123 and the mounting block 121. When the suction cup contacts the diffusion layer 2, the universal ball joint 1231 allows the suction cup body 123 to rotate freely around its center, automatically finding the optimal contact angle and giving the suction cup body 123 a slight angular adaptive capability. This ensures that when facing uneven materials, the suction cup body 123 can always be parallel to the surface, maintaining a stable negative pressure airflow field, preventing material dropping accidents caused by local air leakage, and improving the reliability of material feeding.

[0050] like Figure 4 , Figure 6 , Figures 8 to 10 As shown: the contact surface of the friction pad 1312 is made of porous foamed polymer material, and the surface of the friction pad 1312 is provided with anti-slip texture.

[0051] The friction pad 1312 is in direct contact with the microporous layer of the diffusion layer 2, making material selection crucial. In this embodiment, a porous foamed polymer is used to make the contact surface. Its low modulus allows it to coat the tiny particles on the surface of the diffusion layer 2 without creating indentations. The anti-slip texture on the surface generates mechanical interlocking force. Furthermore, since carbon paper is conductive and easily generates electrostatic adsorption during separation, conductive particles can be incorporated into the material to form electrostatic conductive pathways, further increasing the contact flexibility. The anti-slip texture improves the static friction coefficient, ensuring sufficient lateral damping force even under relatively small vertical pressure, firmly anchoring the center of the diffusion layer 2. The electrostatic conductive pathways effectively conduct electrostatic charges to the ground, preventing the material from sticking to the friction pad 1312 during feeding due to electrostatic adsorption.

[0052] like Figures 1 to 4 and Figure 10 As shown: The mounting bracket 1 is also equipped with a sensor; the drive mechanism 14 is electrically connected to the sensor and is configured to adjust the output pressure of the drive mechanism 14 according to the suspension height of the diffusion layer 2 or the acceleration signal during movement.

[0053] The sensors are preferably ranging sensors or accelerometers. The ranging sensor (not shown in the figure) monitors the suspension height of the diffusion layer 2 in real time after it is sucked up. The controller only instructs the drive mechanism 14 to act when the height reaches the preset safe anchoring range. The accelerometer (not shown in the figure) monitors the acceleration of the robot arm during movement. When a large inertial force generated by a sudden stop or high-speed turn is detected, the system automatically instructs the drive mechanism 14 to increase the downward stroke and increase the friction. By introducing sensor closed-loop feedback, the device has environmental perception and dynamic response capabilities. The device no longer acts blindly, but only triggers tension after confirming that the material is stably suspended, avoiding suction or crushing; at the same time, dynamic stability control is achieved, balancing production efficiency and safety.

[0054] like Figures 1 to 4 and Figure 10 As shown: The linear actuator 141 is a cylinder or linear motor with adjustable stroke; by adjusting the extension stroke length of the linear actuator 141, the displacement of the connecting rod 1421 driving the mounting block 121 to slide outward along the slide rail 11 is controlled, thereby realizing stepless adjustment of the tension of the diffusion layer 2.

[0055] The tensile strength and Young's modulus of diffusion layers 2 vary greatly depending on the batch or supplier. This embodiment uses an adjustable-stroke cylinder or linear motor as the drive source. By electronically controlling the final extension length of the actuator, the presence of the drive frame 142 and connecting rod 1421 results in a longer total stroke for the actuator. After deducting the idle stroke, the effective stroke for pushing the suction cup outward is longer, and the diffusion layer 2 is stretched more. Adjusting the end point of the drive source's stroke directly changes the stroke size, thus linearly changing the distance the suction cup is stretched outward. This allows for stepless tension adjustment using the same tooling. For fragile materials, the stroke is reduced to lower tension; for severely wrinkled flexible materials, the stroke is increased to ensure straightness. This achieves refined and customized adjustment of the material adsorption and gripping capability.

[0056] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A fuel cell diffusion layer feeding device with adjustable adsorption force, comprising a mounting bracket and a plurality of suction components disposed on the mounting bracket; characterized in that, The mounting bracket is provided with multiple radially extending slide rails; The suction component is configured to perform an expansion or contraction motion along the corresponding slide rail; The mounting bracket is also equipped with a friction assembly and a drive mechanism; The friction assembly is configured to perform an extension or retraction motion in the vertical direction; The drive mechanism is located above the friction assembly, and both the suction assembly and the friction assembly are connected to the drive mechanism for transmission. The drive mechanism is configured to drive the friction assembly to extend outward to abut against the diffusion layer, and to drive the suction assembly to slide outward along the slide rail to apply tension to the diffusion layer.

2. The fuel cell diffusion layer feeding device with adjustable adsorption force according to claim 1, characterized in that, The driving mechanism includes a linear actuator and a driving frame disposed on the top of the mounting bracket and capable of sliding along the vertical direction of the mounting bracket; a plurality of driving rods are disposed on the periphery of the driving frame, the number of driving rods corresponding to the number of suction components; the suction components and the driving rods are hinged together by connecting rods.

3. The fuel cell diffusion layer feeding device with adjustable adsorption force according to claim 2, characterized in that, The suction assembly includes a mounting block slidably disposed on the slide rail, the mounting block having a groove extending along the slide rail; one end of the connecting rod is hinged to the drive rod, and the other end is slidably disposed within the groove; a reset elastic element is connected between the mounting block and the mounting bracket; the reset elastic element is configured to apply an inward biasing force to the mounting block, such that during the initial stage of the drive frame moving downward, the mounting block remains stationary, while the connecting rod slides relative to the drive rod within the groove.

4. The fuel cell diffusion layer feeding device with adjustable adsorption force according to claim 3, characterized in that, The slide rail is also provided with an adjustment seat that slides with it. The two ends of the reset elastic element are connected to the mounting block and the adjustment seat respectively. The bottom of the adjustment seat is provided with a locking element that fixes it to different positions on the slide rail.

5. The fuel cell diffusion layer feeding device with adjustable adsorption force according to claim 2, characterized in that, A support frame is provided below the drive frame, and multiple guide rods are fixedly connected to the support frame. The guide rods are slidably sleeved on the drive frame and pass through the mounting bracket. The friction assembly includes a friction pad fixedly connected to the bottom of the guide rod. A buffer spring is sleeved on the guide rod, and the two ends of the buffer spring are respectively connected to the drive frame and the support frame. The drive frame is configured to drive the support frame and the friction pad to move downward synchronously during the downward movement through the buffer spring.

6. The fuel cell diffusion layer feeding device with adjustable adsorption force according to claim 5, characterized in that, The support frame is configured to make a limiting contact with the mounting bracket, and the vertical distance between the support frame and the mounting bracket is configured to be less than the maximum relative sliding distance of the connecting rod in the slide groove; so that after the friction pad moves to a set depth and stops descending, the drive frame continues to move down to compress the buffer spring, and simultaneously drives the connecting rod to eliminate the remaining slide groove stroke, so as to push the mounting block to slide along the slide rail.

7. The fuel cell diffusion layer feeding device with adjustable adsorption force according to claim 3, characterized in that, The suction assembly also includes a suction cup body; the top of the suction cup body is provided with a universal ball head, and the suction cup body is rotatably connected to the bottom of the mounting block through the universal ball head to adaptively fit the surface of the diffusion layer.

8. The fuel cell diffusion layer feeding device with adjustable adsorption force according to claim 5, characterized in that, The contact surface of the friction pad is made of porous foamed polymer material, and the surface of the friction pad is provided with anti-slip texture.

9. A fuel cell diffusion layer feeding device with adjustable adsorption force according to any one of claims 1-8, characterized in that, The mounting bracket is also equipped with a sensor; the drive mechanism is electrically connected to the sensor and is configured to adjust the output pressure of the drive mechanism according to the suspension height of the diffusion layer or the acceleration signal during movement.

10. A fuel cell diffusion layer feeding device with adjustable adsorption force according to claim 3, characterized in that, The linear actuator is a cylinder or linear motor with adjustable stroke; by adjusting the extension stroke length of the linear actuator, the displacement of the connecting rod driving the mounting block to slide outward along the slide rail is controlled, thereby achieving stepless adjustment of the tension of the diffusion layer.

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