A hydrogen storage bottle production system and method for low-altitude aircraft

Abstract

The application relates to the technical field of hydrogen storage cylinders, in particular to a hydrogen storage cylinder production system and method for low-altitude aircrafts, which comprises a numerical control fiber winding device, a fiber impregnation device and a calender, and further comprises a rubber wrapping mechanism, which is arranged on the numerical control fiber winding device and is used for assisting in wrapping the rubber layer outside a metal inner container; a fiber winding mechanism arranged on a machining table, which is used for uniformly distributing resin in the fiber winding process in cooperation with the fiber impregnation device and the numerical control fiber winding device; and a pressure roller mechanism arranged on the numerical control fiber winding device. The technical problem that the rubber layer is overlapped and thickened due to extrusion is solved.

Description

Technical Field

[0001] This invention relates to the field of hydrogen storage cylinder technology, and in particular to a production system and method for hydrogen storage cylinders for low-altitude aircraft. Background Technology

[0002] Currently, hydrogen storage cylinders for drones are mainly divided into Type III (aluminum inner liner) and Type IV (plastic inner liner) carbon fiber fully wound composite cylinders in high-pressure gaseous state, as well as liquid hydrogen storage tanks with a titanium alloy vacuum double-layer design. These composite material hydrogen storage cylinders, with their extremely high mass energy density and lightweight advantages, not only increase the drone's endurance by more than three times compared to traditional lithium batteries, but also enable stable operation in extreme environments ranging from -40℃ to 60℃, completely solving the problems of long flight time and heavy payload. Their production process is highly precise. Typically, a high-barrier inner liner is first prepared using rotational molding or injection molding, and the metal inner liner opening is sealed. Then, epoxy resin-impregnated carbon fibers are wound in multiple axes using automated equipment. Finally, the cylinders undergo microwave or thermosetting molding and rigorous safety testing, thus creating an energy storage core that combines high strength and pressure resistance with extreme lightweight design.

[0003] Patent document CN119687359A discloses a plastic-lined carbon fiber fully wound composite gas cylinder and its preparation method, relating to the field of hydrogen storage cylinder technology. The plastic-lined carbon fiber fully wound composite gas cylinder of this invention is formed by alternating spiral and annular winding of carbon fibers impregnated with an impregnation slurry. The thickness of each single layer of the annular winding layer and the spiral winding layer is 0.35–0.38 mm, the number of annular winding layers is 30–32, and the number of spiral winding layers is 34–36.

[0004] However, in a hydrogen cylinder, a rubber insulation layer is placed between the fiber layer and the metal liner. However, when composite fibers are wrapped around the rubber insulation layer, the rubber layer deforms and overlaps, resulting in uneven thickness on the product surface and affecting the insulation strength of the product. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by setting up a rubber wrapping mechanism and a fiber winding mechanism to simultaneously perform rubber wrapping and fiber winding, pre-stretching the rubber layer, and using the grooves in the inner liner to control the deformation flow direction of the rubber layer, thereby solving the technical problem of the rubber layer overlapping and thickening under compression.

[0006] To address the above technical issues, the following technical solution is adopted: A hydrogen storage cylinder production system for low-altitude aircraft includes a CNC fiber winding device, a fiber impregnation device, and a calender, and further includes: A rubber wrapping mechanism, which is mounted on a CNC fiber winding device and is used to assist in wrapping the outer rubber layer of the metal liner, includes a processing table slidably connected to both sides of the metal liner, a pulling assembly mounted on the processing table, and a rubber impregnation assembly mounted behind the pulling assembly. The tensioning assembly includes a needle roller for setting a large number of pinholes in the rubber layer, an extension roller rotatably connected to the rear of the needle roller, and a pressure roller rotatably connected to the rear of the needle roller. The rubber layer output from the calender passes through the stretching assembly, where it is squeezed under pressure to further deform and create numerous grooves on its surface. Then, in conjunction with a CNC fiber winding device, the rubber layer is wrapped around the outside of the metal liner.

[0007] Preferably, the tensioning assembly further includes two sets of positioning rollers hinged to both sides of the metal inner liner, positioning grooves disposed on the positioning rollers, a positioning rod elastically fixed in the middle of the positioning groove, and two sets of tension rods movably connected to both sides of the positioning rod.

[0008] Preferably, the impregnation assembly includes an extrusion roller hinged to a processing table, extrusion grooves evenly arranged on the surface of the extrusion roller, extrusion plates hinged to both sides inside the extrusion grooves, and an extrusion wheel slidably connected between the two sets of extrusion plates. The tensioning component actively deforms the rubber layer by stretching it, thereby enlarging the pinholes on the rubber layer. This allows the resin to pass through the pinholes and enter the space between the rubber layer and the metal inner liner. The resin is then squeezed to promote its flow within the metal liner, achieving uniform dispersion.

[0009] Preferably, the hydrogen storage cylinder production system for low-altitude aircraft further includes a fiber winding mechanism mounted on a processing table. The fiber winding mechanism is used to cooperate with the fiber impregnation device and the CNC fiber winding device to achieve uniform distribution of resin during the fiber winding process. It includes a branching assembly mounted near the fiber impregnation device and a wiring assembly mounted above the branching assembly.

[0010] Preferably, the splitter assembly includes a splitter frame hinged to the processing table, a supplementary groove fixed to the bottom of the splitter frame, multiple sets of partitions slidably connected to the splitter frame and having drainage grooves on their surfaces, and rubber bands disposed behind the partitions. The fibers pass through a splitter, where partitions separate the fibers and replenish the surface resin. Excess resin is removed by a rubber band scraper.

[0011] Preferably, the wiring assembly includes a flow control roller hinged to the processing table, an arc-shaped scraper evenly disposed on the surface of the flow control roller, and a pressure roller hinged to the other side of the processing table.

[0012] Preferably, the wiring assembly further includes a compact roller disposed between the flow control roller and the pressure roller and hinged to the processing table, and paddles uniformly disposed on the surface of the compact roller.

[0013] Preferably, the flow control roller, pressure roller, and compact roller are provided with positioning pins at one end near the pulling assembly, and the positions of the flow control roller, pressure roller, and compact roller are aligned with the extrusion roller, with the extrusion roller located between the flow control roller and the compact roller; The fibers are guided by the splitter and wound onto the surface of the metal inner liner. Gaps are created between the fibers. The flow control roller scrapes the resin into the pores in the middle of the fibers. In conjunction with the rubber wrapping mechanism, excess resin is penetrated into the bottom of the rubber layer. Then the fibers are tightly bound together, air is expelled and the resin is pressed evenly.

[0014] Preferably, the hydrogen storage cylinder production system for low-altitude aircraft further includes a pressure roller mechanism disposed on a CNC fiber winding device. The pressure roller mechanism is disposed at the bottom of a metal inner liner and includes a horizontally movable slide table, a lifting table slidably connected to the slide table with resin, a recycling tank disposed in the middle of the lifting table, a pressure roller disposed on the lifting table, and a sandblasting nozzle disposed above the pressure roller. The pressure roller uses a pressure roller process to press spiral grooves into the surface of the metal inner liner, and sprays out particles during the pressure rolling process to embed them into the spiral grooves.

[0015] As a further preferred embodiment, the method for producing hydrogen storage cylinders for low-altitude aircraft, applied to the aforementioned hydrogen storage cylinder production system for low-altitude aircraft, includes the following steps: S1: Mechanical treatment of the metal inner liner surface Fix the metal liner and rotate it; apply mechanical rolling pressure to the surface of the metal liner to press out a spiral groove; simultaneously spray hard particles into the spiral groove area so that the hard particles are embedded in the metal liner. S2: Rubber layer perforation stretching and pre-bonding The stretched rubber layer is transported to the processing station; the surface of the rubber layer is punctured to form through holes; tensile force is applied to the rubber layer to cause it to plastically extend, and the diameter of the through holes is simultaneously enlarged; the treated rubber layer is initially wrapped around the outside of the metal liner; S3: Fiber bundle lipid content regulation and simultaneous penetration densification S3.1: Fiber bundle adhesive dispersion and resin scraping After the reinforcing fibers are initially coated with resin by the impregnation device, they are introduced into the processing table; the fiber bundles are evenly separated to form a parallel fiber bundle array; after the resin missing on the surface of the fiber bundles is replenished and moistened, the parallel fiber bundles are elastically scraped to remove the excess resin adhering to the surface, so that the fiber bundles are in a state of being loaded with an appropriate amount of liquid resin. S3.2: Fiber bundle entanglement and interfacial penetration compaction Parallel fiber bundles with controlled resin content are spirally wound onto the outer surface of the rubber layer. During the winding process, intermittent extrusion pressure is applied to the lower rubber layer to clamp and lift it to form a fluid permeation gap. Simultaneously, a pushing force is applied to the dispersed fiber bundles wound on the outside to push adjacent fiber bundles together to achieve a tight arrangement. The mechanical extrusion pressure generated by the tight arrangement forces excess resin in the fiber bundle gaps to flow downwards, pass through the through holes on the surface of the rubber layer, and inject into the fluid permeation gap, contacting the spiral grooves on the surface of the metal liner. S4: Overall curing and molding Maintaining the above-mentioned close arrangement until the resin completes the cross-linking reaction, the resin that has penetrated to the interface is cured to form anchoring nodes that penetrate the rubber layer, ultimately resulting in a non-porous composite hydrogen storage bottle structure.

[0016] The beneficial effects of this invention are: (1) In this invention, a tensioning assembly with needle rollers and extension rollers is set up to puncture the rubber layer before wrapping it to form through holes, and a tensile force is applied to make it plastically elongated. This design makes it less likely for the rubber layer to flow and accumulate or wrinkle and overlap when it is subsequently compressed, ensuring the uniformity of the insulation layer thickness, while providing a flow channel for resin penetration; (2) In this invention, by setting up a fiber control mechanism consisting of a splitter frame, rubber bands and compact rollers, and cooperating with the extrusion action of the impregnation assembly, the dispersion and arrangement of fiber bundles and the gradient control of resin are realized. The mechanical extrusion force generated when the fiber bundles are tightly arranged forces excess resin to flow downward and pass through the through holes of the rubber layer, thereby forming a dense filling layer between the rubber layer and the metal liner, solving the technical problem of weak interlayer bonding; (3) In this invention, by pressing spiral grooves on the surface of the metal liner and embedding hard particles, the rolling mechanism and sandblasting work together to form a microscopic mechanical interlocking structure on the surface of the metal liner. This structure significantly increases the roughness and specific surface area of ​​the metal surface, and together with the resin that penetrates to the bottom, it improves the interfacial bonding strength between the metal liner and the composite material layer; (4) In this invention, the rubber wrapping, resin infiltration and fiber winding processes are carried out simultaneously. The radial pressure during fiber winding is used as the driving force for resin flow, so that the resin can fully fill the fluid infiltration gap at the bottom of the rubber layer and engage with the spiral groove on the surface of the metal liner. This simultaneous densification process not only eliminates the need for a separate vacuum introduction process, but also realizes the integrated molding of the fiber layer, rubber insulation layer and metal liner, which greatly improves production efficiency and product structure consistency.

[0017] In summary, this equipment has the advantages of simple structure, high production efficiency, and good product uniformity, and is especially suitable for the field of hydrogen storage cylinder technology. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of a hydrogen storage cylinder production system for low-altitude aircraft.

[0020] Figure 2 This is a partial structural diagram of a hydrogen storage cylinder production system for low-altitude aircraft.

[0021] Figure 3 This is a schematic diagram of the relevant structure of the rubber wrapping mechanism.

[0022] Figure 4 This is a partial structural diagram of the tension component.

[0023] Figure 5 This is a schematic diagram of the relevant structure of the positioning roller.

[0024] Figure 6 This is a schematic diagram of the relevant structure of the extrusion roller.

[0025] Figure 7 This is a schematic diagram of the branching assembly.

[0026] Figure 8 This is a schematic diagram of the wiring assembly.

[0027] Figure 9 This is a schematic diagram of the rolling mechanism.

[0028] Figure 10 This is a schematic diagram of the process flow for producing hydrogen storage cylinders for low-altitude aircraft. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0030] Example 1 like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a hydrogen storage cylinder production system for low-altitude aircraft includes a CNC fiber winding device 01, a fiber impregnation device 02, and a calender 03, and further includes: A rubber wrapping mechanism 1 is provided on a CNC fiber winding device 01 and is used to assist in wrapping the outer rubber layer of the metal liner. It includes a processing table 11 slidably connected to both sides of the metal liner, a pulling assembly 12 provided on the processing table 11, and a rubber impregnation assembly 13 provided behind the pulling assembly 12. The tensioning assembly 12 includes a needle roller 121 for setting a large number of pinholes on the rubber layer, an extension roller 122 rotatably connected to the rear of the needle roller 121, and a pressure roller 123 rotatably connected to the rear of the needle roller 121. The rubber layer output from the calender 03 passes through the stretching assembly 12, where it is squeezed under pressure to further deform and create numerous grooves on its surface. Then, in conjunction with the CNC fiber winding device 01, the rubber layer is wrapped around the outside of the metal liner.

[0031] In this embodiment, by setting a rubber wrapping component, the rubber layer to be wrapped on the metal sheet is stretched and extended in advance, so that the rubber layer wraps on the metal sheet in a deformed state. This avoids excessive pressure that may occur during the subsequent fiber wrapping process, which could lead to deformation and ultimately cause the flow of rubber deformation to become out of control, resulting in uneven wrapping.

[0032] In detail, the metal inner liner is fixed and rotated on the CNC fiber winding device 01, the fiber impregnation device 02 inputs composite fibers, and the calender 03 inputs the rubber layer. The rubber layer is placed between the composite fibers and the metal inner liner to achieve an insulation effect. In the prior art, the insulation layer is usually wrapped first, and then the composite fibers are wound around the outside. However, in order to make the composite fibers wound and fixed tightly, a large force needs to be applied. When the fibers are wound on the rubber layer, they will inevitably compress the rubber layer, which will cause the rubber layer to deform. As the composite fibers are wound around, the excess rubber will be squeezed to the outside. The rubber layer is also tightly spirally wound around during the winding process. With the occurrence of deformation, the seams will inevitably overlap, which will increase the thickness of the insulation layer at that location, and thus increase the overall thickness of the composite material.

[0033] Furthermore, if glue is directly applied between the rubber layer and the metal liner for bonding, the rubber layer will not be able to fully expand and flow during deformation. Under pressure, this will cause wrinkles and overlaps at non-seam areas or separation at the bonded points. If glue is not applied, the bonding surfaces will not be tight, reducing strength.

[0034] The processing table 11 moves horizontally parallel to the axis of the metal inner liner to achieve the wrapping of the rubber layer and output the rubber layer. The needle roller 121 sets a large number of needle holes on the surface of the rubber layer. The extension roller performs preliminary compression on the rubber layer, causing the rubber layer to extend and deform to both sides, so that the rubber layer can complete the wrapping in the state of being compressed and deformed. The pressure roller 123 presses the rubber layer onto the surface of the metal inner liner to complete the wrapping, and at the same time presses out the grooves on its surface.

[0035] By setting a large number of pinholes on the rubber layer, the resin wrapped on the outer fiber can pass through the pinholes and enter the bottom of the rubber layer. The resin simultaneously bonds the metal liner, the rubber layer and the composite fiber, and they are anchored together to ensure that there is no relative slippage between the three, thus improving the strength.

[0036] It should be noted that the grooves on the rubber layer serve two purposes: firstly, they enhance the strength of the rubber layer and reduce its rebound; secondly, they facilitate resin flow, allowing the resin to diffuse more quickly and evenly beneath the rubber layer, thereby improving the bonding effect between the resin and the rubber layer.

[0037] Furthermore, such as Figure 3 , Figure 5 As shown, the tensioning assembly 12 also includes two sets of positioning rollers 124 hinged to both sides of the metal inner liner, positioning grooves 125 disposed on the positioning rollers 124, positioning rods 126 elastically fixed in the middle of the positioning grooves 125, and two sets of tension rods 127 movably connected to both sides of the positioning rods 126.

[0038] Furthermore, such as Figure 6 As shown, the impregnation assembly 13 includes an extrusion roller 131 hinged to the processing table 11, extrusion grooves 132 evenly arranged on the surface of the extrusion roller 131, extrusion plates 133 hinged to both sides inside the extrusion grooves 132, and an extrusion wheel 134 slidably connected between the two sets of extrusion plates 133. The tensioning component 12 actively deforms the rubber layer by stretching it, thereby enlarging the pinholes on the rubber layer. This allows the resin to pass through the pinholes and enter the space between the rubber layer and the metal inner liner. The resin is then squeezed to promote its flow within the metal liner, achieving uniform dispersion.

[0039] In this embodiment, by setting up the pulling component 12 and the impregnation component 13, and cooperating with the subsequent fiber winding mechanism 2, the rubber layer is pulled. By utilizing the characteristic that the pinholes become larger during the pulling process, the resin can enter the bottom of the rubber layer for bonding and coating.

[0040] In detail, the positioning roller 124 rotates with the metal inner liner, and the positioning rod 126 and the tension rod 127 in the positioning groove 125 pop out and press against the rubber layer on the surface of the metal inner liner. The positioning rod 126 in the middle remains in position, and the tension rod 127 moves back and forth to stretch the rubber layer and deform it, causing the pinholes on it to become larger.

[0041] The rear extrusion roller 131 rotates with the metal inner liner, and the extrusion plates 133 in the extrusion groove 132 rotate and move closer to each other, clamping the rubber layer below and forming a hollow at the bottom of the rubber layer, so that a large amount of resin can be sucked in. The extrusion roller 134 moves and presses down the clamped rubber layer, causing the internal resin to flow to all sides and be evenly dispersed.

[0042] It should be noted that the pulling component 12 is located at the front end of the processing table 11, and the impregnation component 13 is located at the rear end of the processing table 11. While the pulling component 12 pulls the rubber layer, the impregnation component 13 clamps the rubber layer, further increasing the pinholes on the rubber layer, thereby promoting the resin to enter the bottom of the rubber layer. After the two are released, the rubber layer rebounds. In order to avoid displacement during the pulling process, the positioning rod 126 on the positioning roller 124 is fixed and ensures the stability of the bottom position of the rubber.

[0043] Example 2 like Figure 7-8 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows: Furthermore, such as Figure 7 As shown, the hydrogen storage cylinder production system for low-altitude aircraft also includes a fiber winding mechanism 2 set on the processing table 11. The fiber winding mechanism 2 is used to cooperate with the fiber impregnation device 02 and the CNC fiber winding device 01 to achieve uniform distribution of resin during the fiber winding process. It includes a branching assembly 21 set on the side near the fiber impregnation device 02 and a wiring assembly 22 set above the branching assembly 21.

[0044] Furthermore, such as Figure 7 As shown, the splitter assembly 21 includes a splitter frame 211 hinged to the processing table 11, a supplementary groove 212 fixed to the bottom of the splitter frame 211, multiple sets of partitions 213 slidably connected to the splitter frame 211 and having drainage grooves on their surfaces, and a rubber band 214 disposed behind the partitions 213. The fibers pass through the splitter 211, the partition 213 separates the fibers and replenishes the surface resin, and the excess resin is removed by the elastic band 214.

[0045] In this embodiment, by setting up the fiber winding mechanism 2, in conjunction with the rubber wrapping mechanism 1 described above, the excess resin wrapped on the fiber allows the resin to penetrate to the bottom of the rubber layer.

[0046] In detail, in the existing technology, after the composite fiber surface is coated with resin, it is directly wound. It is not easy to control the amount of resin used. The production is mostly carried out by scraping after winding. This application takes advantage of the characteristic that the amount of resin used in the fiber is easy to be excessive, so that the resin coated on the fiber surface is stable. Then the resin is adsorbed to the bottom of the rubber layer for bonding. The rubber layer and the fiber layer are wound and wrapped at the same time, which makes it easier to control the deformation of the rubber layer.

[0047] The fibers pass through the partitions 213 on the splitter frame 211, where they are separated and wound onto the metal inner liner. As they pass through the splitter frame 211, the fibers enter the replenishment groove 212 at the bottom. The replenishment groove 212 contains resin to replenish any missing resin on the fibers, ensuring uniform resin coverage throughout the fibers and preventing resin loss during long-distance movement. The fibers then pass through the elastic band 214, which is positioned below them. As the fibers move forward, the elastic band 214 rotates. The elastic band 214 is elastic, and during rotation and rebound, it dislodges excess resin from the fibers, thus maintaining a uniform and controlled resin distribution on the fibers and allowing them to be wound separately onto the outer side of the rubber layer. Furthermore, such as Figure 8 As shown, the wiring assembly 22 includes a flow control roller 221 hinged to the processing table 11, an arc-shaped scraper 222 evenly disposed on the surface of the flow control roller 221, and a pressure roller 223 hinged to the other side of the processing table 11.

[0048] The wiring assembly 22 also includes a compact roller 224 disposed between the flow control roller 221 and the pressure roller 223 and hinged on the processing table 11, and paddles 225 uniformly disposed on the surface of the compact roller 224.

[0049] The flow control roller 221, pressure roller 223 and compact roller 224 are provided with positioning pins 226 at one end near the pulling assembly 12. The positions of the flow control roller 221, pressure roller 223 and compact roller 224 are aligned with the extrusion roller 131 and the extrusion roller 131 is located between the flow control roller 221 and the compact roller 224. The fibers are guided by the splitter 211 and wound onto the surface of the metal inner liner. Gaps are created between the fibers. The flow control roller 221 scrapes the resin into the pores in the middle of the fibers. In conjunction with the rubber wrapping mechanism 1, excess resin is penetrated into the bottom of the rubber layer. Then the fibers are tightly bound together, air is expelled and the resin is pressed evenly.

[0050] In this embodiment, by setting the wiring assembly 22, the already wound fibers are rearranged tightly, and during the arrangement process, the resin can be fully distributed in the gaps in the middle.

[0051] In detail, the fibers are separately wound around the outside of the rubber layer. At this time, the resin at the bottom overflows to the outside and passes through the flow control roller 221. The flow control roller 221 rotates and scrapes the resin on the outside of the fiber to the middle of the fiber. Then it enters the compact roller 224. The compact roller 224 rotates and the paddle 225 pushes the originally separated fibers, making the fibers come closer to each other and achieve a tight arrangement. Then the metal liner continues to rotate, so that the fibers move to the pressure roller 223. The pressure roller 223 applies pressure, which on the one hand allows the resin inside to flow fully again, thereby achieving a uniform distribution of the resin inside, and on the other hand smooths the resin on the surface of the fiber, thereby achieving a smooth surface of the hydrogen storage bottle product.

[0052] The flow control roller 221 and the pressure roller 223 are provided with positioning pins 226 at one end near the pulling assembly 12. As they rotate, the positioning pins 226 lock onto the rubber parts below, thereby preventing the pulling force of the pulling assembly 12 from being too large and causing the rubber layer to slip. They also work in conjunction with the extrusion roller 131 to prevent the extrusion roller 131 from excessively pulling the rubber layer and causing the rubber layer to shift in position.

[0053] It should be noted that the flow control roller 221 scrapes the resin on the outside of the fiber into the pores in the middle of the fiber. At this time, the extrusion roller 131 clamps the rubber layer below and lifts the rubber layer, so that the resin in the middle of the fiber is sucked into the rubber layer. Then the fibers are tightly arranged. By using the extrusion when the fibers move, the resin is forced to pass through the needle hole on the one hand, and the internal air is squeezed out on the other hand, so as to avoid the presence of air residue between the fibers.

[0054] Example 3 like Figure 9 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows: The hydrogen storage cylinder production system for low-altitude aircraft also includes a pressure roller mechanism 3 set on the CNC fiber winding device 01. The pressure roller mechanism 3 is located at the bottom of the metal inner liner and includes a horizontally movable slide table 31, a lifting platform 32 slidably connected to the slide table 31 with resin, a recycling tank 33 set in the middle of the lifting platform 32, a pressure roller 34 set on the lifting platform 32, and a sandblasting nozzle 35 set above the pressure roller 34. The pressure roller 34 uses the pressure roller 223 process to press spiral grooves into the surface of the metal inner liner, and sprays out during the pressing process to embed the particles into the spiral grooves.

[0055] In this embodiment, by setting a rolling mechanism 3, a spiral groove is set on the metal inner liner using a rolling process, and sandblasting is applied to its surface during the rolling process, so that the particles are pressed into the groove by the rolling mechanism.

[0056] In detail, the slide 31 moves along the axial direction of the metal inner liner, the lifting platform 32 rises, the pressure roller 34 contacts the metal inner liner to perform pressure rolling, the sandblasted material is sprayed out, and then recovered through the recycling tank 33.

[0057] The spiral grooves serve two purposes: firstly, when the rubber layer is compressed, it can flow into the grooves, thereby reducing lateral flow and positional displacement; secondly, they enhance the bonding effect between the rubber layer and the metal liner. Additionally, sandblasted particles are embedded in the grooves, further interlocking the particles with the rubber layer to form a tenon-and-mortise structure, which, combined with resin, further enhances the bonding effect.

[0058] The selection of sandblasting particles not only requires a certain degree of hardness to withstand the enormous mechanical force during rolling, but also needs to have good chemical affinity or physical bonding with subsequent adhesives, such as alumina nanoparticles.

[0059] Example 4 like Figure 10 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows: The method for producing hydrogen storage cylinders for low-altitude aircraft, applied to the aforementioned hydrogen storage cylinder production system for low-altitude aircraft, includes the following steps: S1: Mechanical treatment of the metal inner liner surface Fix the metal liner and rotate it; apply mechanical rolling pressure to the surface of the metal liner to press out a spiral groove; simultaneously spray hard particles into the spiral groove area so that the hard particles are embedded in the metal liner. S2: Rubber layer perforation stretching and pre-bonding The stretched rubber layer is transported to the processing station; the surface of the rubber layer is punctured to form through holes; tensile force is applied to the rubber layer to cause it to plastically extend, and the diameter of the through holes is simultaneously enlarged; the treated rubber layer is initially wrapped around the outside of the metal liner; S3: Fiber bundle lipid content regulation and simultaneous penetration densification S3.1: Fiber bundle adhesive dispersion and resin scraping After the reinforcing fibers are initially coated with resin by the impregnation device, they are introduced into the processing table 11; the fiber bundles are evenly separated to form a parallel fiber bundle array; after the resin missing on the surface of the fiber bundles is replenished and moistened, the parallel fiber bundles are elastically scraped to remove the excess resin adhering to the surface, so that the fiber bundles are in a state of being loaded with an appropriate amount of liquid resin. S3.2: Fiber bundle entanglement and interfacial penetration compaction Parallel fiber bundles with controlled resin content are spirally wound onto the outer surface of the rubber layer. During the winding process, intermittent extrusion pressure is applied to the lower rubber layer to clamp and lift it to form a fluid permeation gap. Simultaneously, a pushing force is applied to the dispersed fiber bundles wound on the outside to push adjacent fiber bundles together to achieve a tight arrangement. The mechanical extrusion pressure generated by the tight arrangement forces excess resin in the fiber bundle gaps to flow downwards, pass through the through holes on the surface of the rubber layer, and inject into the fluid permeation gap, contacting the spiral grooves on the surface of the metal liner. S4: Overall curing and molding Maintaining the above-mentioned close arrangement until the resin completes the cross-linking reaction, the resin that has penetrated to the interface is cured to form anchoring nodes that penetrate the rubber layer, ultimately resulting in a non-porous composite hydrogen storage bottle structure.

[0060] In the description of this invention, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0061] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0062] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A hydrogen storage cylinder production system for low-altitude aircraft, comprising a CNC fiber winding device, a fiber impregnation device, and a calender, characterized in that, Also includes: A rubber wrapping mechanism, which is mounted on a CNC fiber winding device and is used to assist in wrapping the outer rubber layer of the metal liner, includes a processing table slidably connected to both sides of the metal liner, a pulling assembly mounted on the processing table, and a rubber impregnation assembly mounted behind the pulling assembly. The tensioning assembly includes a needle roller for setting a large number of pinholes in the rubber layer, an extension roller rotatably connected to the rear of the needle roller, and a pressure roller rotatably connected to the rear of the needle roller. The rubber layer output from the calender passes through the stretching assembly, where it is squeezed under pressure to further deform and create numerous grooves on its surface. Then, in conjunction with a CNC fiber winding device, the rubber layer is wrapped around the outside of the metal liner.

2. The hydrogen storage cylinder production system for low-altitude aircraft according to claim 1, characterized in that, The tensioning assembly also includes two sets of positioning rollers hinged to both sides of the metal inner liner, positioning grooves set on the positioning rollers, a positioning rod that is elastically fixed in the middle of the positioning groove, and two sets of tension rods that are movably connected to both sides of the positioning rod.

3. The hydrogen storage cylinder production system for low-altitude aircraft according to claim 1, characterized in that, The impregnation assembly includes an extrusion roller hinged to the processing table, an extrusion groove evenly arranged on the surface of the extrusion roller, an extrusion plate hinged to both sides inside the extrusion groove, and an extrusion wheel slidably connected between the two sets of extrusion plates. The tensioning component actively deforms the rubber layer by stretching it, thereby enlarging the pinholes on the rubber layer. This allows the resin to pass through the pinholes and enter the space between the rubber layer and the metal inner liner. The resin is then squeezed to promote its flow within the metal liner, achieving uniform dispersion.

4. The hydrogen storage cylinder production system for low-altitude aircraft according to claim 1, characterized in that, It also includes a fiber winding mechanism set on the processing table. The fiber winding mechanism is used to cooperate with the fiber impregnation device and the CNC fiber winding device to achieve uniform distribution of resin during the fiber winding process. It includes a wire splitting assembly set on the side near the fiber impregnation device and a wiring assembly set above the wire splitting assembly.

5. A hydrogen storage cylinder production system for low-altitude aircraft according to claim 4, characterized in that, The splitter assembly includes a splitter frame hinged to the processing table, a supplementary groove fixed to the bottom of the splitter frame, multiple sets of partitions slidably connected to the splitter frame and having drainage grooves on their surfaces, and rubber bands disposed behind the partitions. The fibers pass through a splitter, where partitions separate the fibers and replenish the surface resin. Excess resin is removed by a rubber band scraper.

6. A hydrogen storage cylinder production system for low-altitude aircraft according to claim 5, characterized in that, The wiring assembly includes a flow control roller hinged to the processing table, an arc-shaped scraper evenly distributed on the surface of the flow control roller, and a pressure roller hinged to the other side of the processing table.

7. A hydrogen storage cylinder production system for low-altitude aircraft according to claim 6, characterized in that, The wiring assembly also includes a compact roller disposed between the flow control roller and the pressure roller and hinged to the processing table, and paddles evenly disposed on the surface of the compact roller.

8. A hydrogen storage cylinder production system for low-altitude aircraft according to claim 7, characterized in that, The flow control roller, pressure roller, and compact roller are provided with positioning pins at one end near the pulling assembly. The flow control roller, pressure roller, and compact roller are aligned with the extrusion roller, and the extrusion roller is located between the flow control roller and the compact roller. The fibers are guided by the splitter and wound onto the surface of the metal inner liner. Gaps are created between the fibers. The flow control roller scrapes the resin into the pores in the middle of the fibers. In conjunction with the rubber wrapping mechanism, excess resin is penetrated into the bottom of the rubber layer. Then the fibers are tightly bound together, air is expelled and the resin is pressed evenly.

9. A hydrogen storage cylinder production system for low-altitude aircraft according to claim 1, characterized in that, It also includes a pressure roller mechanism set on the CNC fiber winding device. The pressure roller mechanism is set at the bottom of the metal inner liner and includes a horizontally movable slide table, a lifting table slidably connected to the slide table with resin, a recycling trough set in the middle of the lifting table, a pressure roller set on the lifting table, and a sandblasting nozzle set above the pressure roller. The pressure roller uses a pressure roller process to press spiral grooves into the surface of the metal inner liner, and sprays out particles during the pressure rolling process to embed them into the spiral grooves.

10. A method for producing hydrogen storage cylinders for low-altitude aircraft, applied to the hydrogen storage cylinder production system for low-altitude aircraft as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Mechanical treatment of the metal inner liner surface Fix the metal liner and rotate it; apply mechanical rolling pressure to the surface of the metal liner to press out a spiral groove; simultaneously spray hard particles into the spiral groove area so that the hard particles are embedded in the metal liner. S2: Rubber layer perforation stretching and pre-bonding The stretched rubber layer is transported to the processing station; the surface of the rubber layer is punctured to form through holes; tensile force is applied to the rubber layer to cause it to plastically extend, and the diameter of the through holes is simultaneously enlarged; the treated rubber layer is initially wrapped around the outside of the metal liner; S3: Fiber bundle lipid content regulation and simultaneous penetration densification S3.1: Fiber bundle adhesive dispersion and resin scraping After the reinforcing fibers are initially coated with resin by the impregnation device, they are introduced into the processing table; the fiber bundles are evenly separated to form a parallel fiber bundle array; after the resin missing on the surface of the fiber bundles is replenished and moistened, the parallel fiber bundles are elastically scraped to remove the excess resin adhering to the surface, so that the fiber bundles are in a state of being loaded with an appropriate amount of liquid resin. S3.2: Fiber bundle entanglement and interfacial penetration compaction Parallel fiber bundles with controlled resin content are spirally wound onto the outer surface of the rubber layer. During the winding process, intermittent extrusion pressure is applied to the lower rubber layer to clamp and lift it to form a fluid permeation gap. Simultaneously, a pushing force is applied to the dispersed fiber bundles wound on the outside to push adjacent fiber bundles together to achieve a tight arrangement. The mechanical extrusion pressure generated by the tight arrangement forces excess resin in the fiber bundle gaps to flow downwards, pass through the through holes on the surface of the rubber layer, and inject into the fluid permeation gap, contacting the spiral grooves on the surface of the metal liner. S4: Overall curing and molding Maintaining the above-mentioned close arrangement until the resin completes the cross-linking reaction, the resin that has penetrated to the interface is cured to form anchoring nodes that penetrate the rubber layer, ultimately resulting in a non-porous composite hydrogen storage bottle structure.

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