A wrapped gas cylinder and its preparation method

Abstract

The present invention discloses a filament-wound gas cylinder and a preparation method thereof. The filament-wound gas cylinder includes a gas cylinder inner liner, a fiber winding layer, and a toughening and buffering layer. The fiber winding layer includes a circumferential winding layer and a helical winding layer arranged alternately. The circumferential winding layer is arranged on the cylindrical section of the gas cylinder inner liner. The helical winding layer is arranged on the entire length section of the gas cylinder inner liner. The toughening and buffering layer includes an interlayer toughening and buffering layer, and the interlayer toughening and buffering layer is arranged on the cylindrical section between the circumferential winding layer and the helical winding layer. By providing the toughening and buffering layer, on the one hand, more resin is locked by the fabric felt, effectively ensuring the thickness of the adhesive layer between the circumferential winding layer and the helical winding layer, thereby improving the interlayer bonding strength. On the other hand, by providing the toughening and buffering layer, the influence of the low interlayer shear strength caused by the difference in winding angles between the circumferential winding layer and the helical winding layer is reduced, and the interlayer bonding strength is improved, thereby enhancing the pressure resistance of the gas cylinder.

Description

Technical Field

[0001] The present invention relates to a winding forming process, and particularly to a winding gas cylinder and a preparation method thereof. Background Art

[0002] Compared with traditional metal gas cylinders, composite material winding gas cylinders are receiving more and more attention due to advantages such as light weight and high specific strength, especially in the field of transportation. A winding gas cylinder is a composite material product formed by impregnating continuous fibers with resin and then winding them onto an inner liner mandrel according to the designed process laying pattern and heating and curing. In product design, to ensure the overall pressure resistance of the gas cylinder, the winding process laying usually adopts alternating winding of small-angle spiral winding layers and large-angle circumferential winding layers. The circumferential winding layer mainly strengthens the cylinder section, and the small-angle spiral winding mainly enhances the ends of both ends of the gas cylinder. And a transition layer needs to be inserted between the circumferential winding layer and the spiral winding layer to achieve continuous and stable changes in the position and angle of the winding head.

[0003] According to the winding rule, the radial pressure of the fibers in the small-angle spiral winding layer on the cylinder section is much smaller than that of the circumferential winding layer, resulting in the fiber arrangement in the small-angle spiral layer on the cylinder section not being dense enough. Even if the circumferential winding layer is used to press it tightly in time, it is easy to form hole defects due to residual bubbles between the alternating layers; moreover, since the circumferential winding layer extrudes the excess resin, the thickness of the adhesive liquid between the alternating layers becomes thinner, which also reduces the bonding strength between the winding layers, resulting in low fiber strength performance in the cylinder section and easy bursting failure in the cylinder section. In addition, the winding of the cylinder section is composed of alternating circumferential winding layers and spiral winding layers, and the winding angles of different winding layers will change. Especially when the winding angle of the spiral winding layer is less than 55°, the winding angle difference from the circumferential winding layer close to 90° is significant, resulting in low bonding strength between the winding layers, so that interlayer shear failure is likely to occur during the pressure test, leading to gas cylinder failure. Although some patents point out that the winding adhesive liquid can be toughened and modified to improve the interlayer strength of the gas cylinder, using the modified adhesive liquid to wind the gas cylinder usually affects the processability of the winding adhesive liquid, and the cost increases significantly, which is not conducive to batch application.

[0004] After the winding is completed, it is necessary to release the tension of the impregnated fiber and cut it. The impregnated fiber is knotted by hand or fixed to the product surface by circumferentially winding a high-temperature tape around the end yarn. When releasing the fiber winding tension, it is easy to cause a decrease in the tension of the outer layer fibers of the winding layer, affecting the mechanical property uniformity of the product; the surface of the impregnated fiber is smooth and has small friction, and the quality of knotting the fiber by hand or fixing the fiber by tape winding is unstable. There is a risk of fiber loosening during the curing process, which affects the linear fixing of the outer layer fibers, resulting in the slippage or even reverse unwinding of the outer layer fibers, and causing the winding product to be scrapped; knotting by hand after releasing the tension causes the joint to narrow in width and increase in thickness compared to the normal winding yarn width. The joint remains on the product surface, affecting the appearance of the product and easily forming stress concentration points, reducing the product quality.

[0005] In addition, when the inner liner is made of metal, in order to prevent galvanic corrosion between the aluminum alloy and the carbon fiber winding layer, glue is first brushed on the surface of the metal inner liner and then the carbon fiber layer is wound. However, due to the incompatibility of the glue with the aluminum alloy material, it is difficult to evenly coat the glue on the surface of the aluminum alloy inner liner, and there is a risk of local lack of glue, which may lead to electrochemical corrosion between the aluminum alloy and the carbon fiber, causing the gas cylinder to be scrapped. Summary of the Invention

[0006] In view of this, the present invention provides a winding gas cylinder and a preparation method to solve the problems of low interlayer shear strength of the winding layer caused by differences in winding angles, too thin glue layer thickness, residual bubbles between layers, etc. during the winding process in the prior art, as well as quality defects caused by fixing the end yarn after winding.

[0007] In a first aspect, a winding gas cylinder is provided, including a gas cylinder inner liner, a fiber winding layer, and a toughening buffer layer; the fiber winding layer includes an alternately arranged circumferential winding layer and a helical winding layer; the circumferential winding layer is arranged within the cylindrical section range of the gas cylinder inner liner; the helical winding layer is arranged within the entire length range of the gas cylinder inner liner; the toughening buffer layer includes an interlayer toughening buffer layer, and the interlayer toughening buffer layer is arranged within the cylindrical section range between the circumferential winding layer and the helical winding layer.

[0008] In another embodiment, the innermost layer and the outermost layer of the fiber winding layer are circumferential winding layers.

[0009] In another embodiment, the winding gas cylinder further includes an inner liner surface toughening buffer layer, and the inner liner surface toughening buffer layer is arranged on the entire surface of the gas cylinder inner liner.

[0010] In another embodiment, the inner liner surface toughening buffer layer includes a cylindrical section of the inner liner surface toughening buffer layer and end heads at both ends.

[0011] In another embodiment, the fiber winding layer includes fibers and a resin matrix; the fibers can be in the form of continuous fibers or yarns; the toughened buffer layer is composed of a fabric felt and a resin matrix, and the fabric felt is any one of glass fiber felt, carbon felt, and polyester felt; the resin matrix includes at least any one of polyurethane, modified epoxy resin, and acrylate.

[0012] In another embodiment, the gas cylinder liner is a metal liner, and the fabric felt of the toughened buffer layer on the surface of the liner is any one of glass fiber felt and polyester felt.

[0013] In a second aspect, the present invention provides a method for preparing the above-mentioned wrapped gas cylinder, comprising the steps of:

[0014] The fiber winding layer and the interlayer toughening buffer layer are wound on the gas cylinder liner through a winding production line, specifically including: the fibers impregnated with the first resin matrix are alternately wound on the gas cylinder liner in a circumferential winding layer and a spiral winding layer according to the layer design, and during the winding of the transition layer from the circumferential winding layer to the spiral winding layer, or during the winding of the transition layer from the spiral winding layer to the circumferential winding layer, the fabric felt of the interlayer toughening buffer layer is wound simultaneously, and N turns are wound, N is an integer greater than or equal to 1, and then the fabric felt is cut off before the winding of the transition layer is completed, and the fabric felt winding is stopped; and in the process of winding the fabric felt, a sufficient amount of the second resin matrix needs to be sprayed on the fabric felt at the same time to soak the fabric felt. In the process of winding the transition layer and the interlayer toughening buffer layer, when the fabric felt of the interlayer toughening buffer layer is wound for multiple turns, the fabric felt and the transition layer fibers will overlap each other, but because the distribution of the transition layer fibers is very sparse, the fibers of the transition layer are ignored, and the whole layer is still regarded as the interlayer toughening buffer layer.

[0015] In another embodiment, before winding the fiber winding layer on the gas cylinder liner, it is also necessary to first set a liner surface toughening buffer layer on the outer surface of the gas cylinder liner, which specifically includes the steps of: placing the fabric felt in a head forming mold, and compression molding a head preform; then setting the preformed head preform at the corresponding position of the gas cylinder liner, and tightly winding the fabric felt around the cylinder liner barrel, and docking the two sides of the fabric felt with the head preform; at the same time, during the winding process of the fabric felt, spraying a sufficient amount of the second resin matrix on the fabric felt to penetrate the fabric felt, thereby forming the liner surface toughening buffer layer after subsequent curing.

[0016] In another embodiment, when the inner liner of the gas cylinder is a metal liner, the fabric felt should be glass fiber felt or polyester felt.

[0017] In another embodiment, the first resin matrix and the second resin matrix are different in system, and the two different resin matrices form an interpenetrating structure after co-curing reaction.

[0018] In another embodiment, the method for preparing a wound gas cylinder further includes tail yarn fixing, specifically including:

[0019] Step 1: According to the design of the fiber winding layer, confirm the end position of the fibers of the last fiber winding layer of the wound gas cylinder, so that the fibers after this end position stop infiltrating the resin matrix;

[0020] Step 2: When the fibers of the last fiber winding layer of the wound gas cylinder are wound, start winding the release cloth on the wound gas cylinder from the fiber end position, and at the same time keep the winding tension of the wound gas cylinder and continue to wind the fibers that have not infiltrated the resin matrix, forming a circumferential dry fiber layer and a release cloth layer with a set width and overlapping winding on the surface of the wound gas cylinder;

[0021] Step 3: When the fibers that have not infiltrated the resin matrix and the release cloth are overlapped and wound 1-2 turns, release the winding tension, cut the fibers, then continue to wind at least half a turn of the release cloth for overlapping, and then cut the release cloth and use high-temperature tape to fix the end of the release cloth;

[0022] Step 4: Transfer the whole wound gas cylinder to an oven for heating and curing;

[0023] Step 5: After cooling, remove the high-temperature tape, the release cloth layer, and the circumferential dry fiber layer, and a wound gas cylinder with no fiber joints on the surface and a stable tension can be obtained.

[0024] In another embodiment, in Step 3, it further includes spraying several sections of quick-drying glue circumferentially on the circumferential dry fiber layer or the release cloth layer, and locally heating the quick-drying glue to fix the release cloth layer.

[0025] In another embodiment, the winding production line includes a circumferential winding tooling for laying the winding fabric felt and the release cloth.

[0026] In another embodiment, the circumferential winding tooling includes a mounting plate, a unwind roller shaft, a glue tank, a slitting roller, and a pressing roller. There are two mounting plates, which are arranged oppositely and are used to install and fix the unwind roller shaft, the glue tank, the slitting roller, and the pressing roller; the unwind roller shaft is arranged parallel to the axis of the gas cylinder inner liner, and its two ends are respectively connected to the two mounting plates; the length direction of the glue tank is arranged parallel to the axis of the gas cylinder inner liner, and its two ends are connected to the mounting plate through the first connecting arm; the slitting roller is arranged parallel to the axis of the gas cylinder inner liner, and its two ends are connected to the mounting plate through the second connecting arm; the pressing roller is connected to the mounting plate through the third connecting arm.

[0027] Working principle:

[0028] (1)For fabric felt winding: Install the fabric felt reel onto the unwinding roller shaft, adjust it to be parallel and aligned with the cylinder section of the gas cylinder. Pull out the head of the fabric felt, pass it through the guide roller, and insert it into the gap of the cutting roller. Then continue to pull it down to the pressing roller, and tightly wrap the fabric felt around the gas cylinder through the pressing roller to start winding the fabric felt. When the winding of the fabric felt is completed, cut it off through the slitting roller. When winding the fabric felt for the toughening and buffering layer on the inner surface of the liner, its head end can be fixed with auxiliary tape; when winding the fabric felt for the toughening and buffering layer between layers, since the fiber is with a resin matrix, its head end can be effectively attached and fixed to the fiber layer of the wound gas cylinder;

[0029] (2)For release cloth winding: Remove the fabric felt reel and replace it with the release cloth reel, then it can be used for release cloth winding during tail yarn fixation.

[0030] By introducing a toughening and buffering layer between the circumferential winding layer and the helical winding layer in the wound gas cylinder of the present invention, since the toughening and buffering layer is composed of fabric felt and resin, the fabric felt can lock more resin matrix, effectively ensuring the thickness of the adhesive layer, effectively improving the interlayer strength of the composite material winding layer, and enhancing the pressure resistance of the gas cylinder; in addition, by setting the toughening and buffering layer, the influence of the low interlayer shear strength caused by the difference in winding angles between the circumferential winding layer and the helical winding layer is reduced, and the interlayer bonding strength is improved, thereby enhancing the pressure resistance of the wound gas cylinder. By setting a toughening and buffering layer on the inner surface of the liner, on the one hand, the toughness of the gas cylinder can be improved, and on the other hand, when the inner liner of the gas cylinder is an aluminum alloy inner liner, a uniform anti-electrochemical corrosion layer can be effectively formed on the surface of the aluminum alloy inner liner, avoiding the failure of the gas cylinder caused by the galvanic corrosion between the aluminum alloy inner liner and the carbon fiber.

[0031] In addition, the first resin matrix for infiltrating the fiber and the second resin matrix for infiltrating the fabric felt are resin matrices of different systems. After the co-curing reaction of the two different systems of resin matrices, an interpenetrating network structure is formed to achieve the co-blending toughening of the resins between different winding layers, improving the interlayer strength of the winding layer of the wound gas cylinder and enhancing the toughness of the gas cylinder.

[0032] In the present invention, by using the circumferential winding tooling, the fabric felt can be tightly wound on the fiber layer, discharging the excess air bubbles and resin matrix, improving the product density, and enhancing the interlayer strength and toughness of the wound gas cylinder.

[0033] The method for fixing the tail yarn of the present invention, under the condition of maintaining the winding tension, uses dry fibers and a release fabric to be mutually laminated and then fixed, avoiding the problems of the need to release the fiber winding tension in advance and the smooth surface of the fiber with glue being difficult to knot, maintaining the consistency of the winding tension of the fiber winding product; improving the quality of the tail yarn fixation, avoiding the knot joints remaining on the product surface, and effectively improving the appearance and quality of the product; using the release fabric and the fiber to be mutually laminated, the operability of the fast-drying glue to bond the dry fiber and the release fabric is high and the repeatability is good, which can effectively improve the process stability of the winding molding. Description of the Drawings

[0034] Appendix Figure 1 It is a schematic structural diagram of the axial section of the gas cylinder;

[0035] Appendix Figure 2 It is a schematic structural diagram of the circumferential section of the gas cylinder;

[0036] Appendix Figure 3 It is a schematic structural diagram of the buffer layer on the inner liner surface;

[0037] Appendix Figure 4 It is the axial sectional view during the tail yarn fixation;

[0038] Appendix Figure 5 It is the circumferential sectional view during the tail yarn fixation;

[0039] Appendix Figure 6 It is a schematic structural diagram of the circumferential winding tooling;

[0040] Appendix Figure 7 It is a schematic diagram of the cooperation between the circumferential winding tooling and the winding head;

[0041] Among them: 1 - gas cylinder inner liner; 2 - fiber winding layer; 21 - circumferential winding layer; 22 - helical winding layer; 3 - toughening buffer layer; 31 - interlayer toughening buffer layer; 32 - inner liner surface toughening buffer layer; 321 - cylinder body section of the inner liner surface toughening buffer layer; 322 - head; 4 - release fabric layer; 5 - circumferential dry fiber layer; 6 - high-temperature resistant tape; 7 - fast-drying glue; 8 - circumferential winding tooling; 81 - mounting plate; 82 - unwind roller shaft; 83 - glue tank; 84 - slitting roller; 85 - pressing roller; 86 - first connecting arm; 87 - second connecting arm; 88 - third connecting arm; 9 - fiber; 10 - fabric felt. Detailed Embodiments

[0042] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0043] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0044] As shown in the Figure 1-2 accompanying drawings, a wrapped gas cylinder is shown, which includes a gas cylinder inner liner 1, a fiber winding layer 2, and a toughening and buffering layer 3; the fiber winding layer 2 includes a circumferential winding layer 21 and a helical winding layer 22 arranged alternately; the innermost layer and the outermost layer of the fiber winding layer 2 are circumferential winding layers 21; the circumferential winding layer 21 is arranged on the cylindrical section of the gas cylinder inner liner 1; the helical winding layer 22 is arranged on the entire length section of the gas cylinder inner liner 1; the toughening and buffering layer 3 includes an interlayer toughening and buffering layer 31, and the interlayer toughening and buffering layer 31 is arranged on the cylindrical section between the circumferential winding layer 21 and the helical winding layer 22.

[0045] The fiber winding layer 2 includes fibers and a resin matrix; the fibers can be in the form of continuous fibers or yarns; the interlayer toughening and buffering layer 31 is composed of a fabric felt and a resin matrix, and the fabric felt is any one of a glass fiber felt, a carbon felt, and a polyester felt; the resin matrix includes at least any one of polyurethane, modified epoxy resin, and acrylate.

[0046] The wrapped gas cylinder further includes an inner liner surface toughening and buffering layer 32, and the inner liner surface toughening and buffering layer 32 is arranged between the surface of the gas cylinder inner liner 1 and the innermost circumferential winding layer 21, and is arranged within the entire length range of the gas cylinder inner liner 1.

[0047] The inner liner surface toughening and buffering layer 32 is composed of a fabric felt and a resin matrix, the fabric felt is any one of a glass fiber felt and a polyester felt, and the resin matrix includes at least any one of polyurethane, modified epoxy resin, and acrylate.

[0048] As shown in the Figure 3 accompanying drawings, the inner liner surface toughening and buffering layer 32 includes an inner liner surface toughening and buffering layer cylindrical section 321 and end heads 322 at both ends.

[0049] Referring to the Figure 3-7 accompanying drawings, the preparation method of the above-mentioned wrapped gas cylinder includes:

[0050] The fiber winding layer 2 and the interlayer toughening buffer layer 31 are wound on the gas cylinder liner 1 through a winding production line, specifically comprising: the fiber 9 impregnated with the first resin matrix is alternately wound around the circumferential winding layer 21 and the spiral winding layer 22 on the gas cylinder liner 1 according to the layer design; during the winding of the transition layer from the circumferential winding layer 21 to the spiral winding layer 22, or during the winding of the transition layer from the spiral winding layer 22 to the circumferential winding layer 21, the fabric felt 10 of the interlayer toughening buffer layer 31 is simultaneously wound N times, where N is an integer greater than or equal to 1; then the fabric felt 10 is cut off before the winding of the transition layer is completed, and the winding of the fabric felt 10 is stopped; and, during the winding process of the fabric felt 10, a sufficient amount of the second resin matrix needs to be sprayed on the fabric felt 10 to penetrate the fabric felt 10.

[0051] Before winding the fiber winding layer 2 on the gas cylinder liner 1, it is also necessary to first set a liner surface toughening buffer layer 32 on the outer surface of the gas cylinder liner 1, specifically including: placing the fabric felt in a head 322 molding mold, and compression molding the head 322; then setting the preformed head 322 at the corresponding position of the gas cylinder liner 1, and tightly winding the fabric felt 10 around the barrel of the gas cylinder liner 1, and the two sides of the fabric felt 10 are connected to the head; in addition, when winding the fabric felt 10, the fabric felt 10 must be simultaneously impregnated with a second resin matrix, thereby forming the liner surface toughening buffer layer 32.

[0052] When the gas cylinder liner 1 is a metal liner, the fabric felt 10 of the toughening buffer layer 32 on the surface of the liner should be glass fiber fabric felt or polyester fabric felt.

[0053] The first resin matrix used for impregnating the fiber 9 can usually be selected from epoxy resin or modified epoxy resin, and the second resin matrix used for impregnating the fabric felt 10 is a toughening resin, which can be any one of polyurethane, modified epoxy resin, and acrylate; and the first resin matrix used for impregnating the fiber 9 and the second resin matrix used for impregnating the fabric felt 10 should be resins of different systems, and the two different systems of resins form an interpenetrating structure after co-curing reaction.

[0054] See attached Figure 4-5 As shown, the preparation method of the wrapped gas cylinder also includes tail yarn fixing, specifically including:

[0055] Step 1: According to the winding design, determine the end position of the fibers of the last fiber winding layer 2 of the gas cylinder, so that the fibers after the end position stop infiltrating the resin matrix;

[0056] Step 2: When the fiber winding of the last fiber winding layer 2 of the wound gas cylinder is completed, start winding the release fabric on the wound gas cylinder from the end position of the fiber, and at the same time, continue to wind the fiber 9 without infiltrating the resin matrix while maintaining the winding tension of the wound gas cylinder, so that the fiber 9 without infiltrating the resin matrix and the release fabric are wound in an overlapping manner to form a circumferential dry fiber layer 5 and a release fabric layer 4 with a set width and wound in an overlapping manner on the surface of the wound gas cylinder; the width of the circumferential dry fiber layer 5 is controlled within 1-2 times the yarn width; the width of the release fabric layer 4 is greater than the width of the circumferential dry fiber layer 5, preferably 2-4 times the yarn width; the yarn width refers to the width of the continuous fiber or yarn used in the fiber winding layer;

[0057] Step 3: When the fiber without infiltrating the resin matrix and the release fabric are wound in an overlapping manner for 1-2 turns, release the winding tension, cut off the fiber 9, then continue to wind the release fabric for one more turn and overlap it, and then cut off the release fabric and use a high-temperature resistant tape 6 to fix the end of the release fabric;

[0058] Step 4: Transfer the entire wound gas cylinder to an oven for heating and curing;

[0059] Step 5: After cooling, remove the high-temperature resistant tape 6, the release fabric layer 4, and the circumferential dry fiber layer 5, and a wound gas cylinder with no fiber joints on the surface and a consistently stable tension can be obtained.

[0060] Further, in the said Step 3, it also includes spraying several sections of quick-drying glue 7 circumferentially on the outermost circumferential dry fiber layer 5 or release fabric layer 4, and locally heating the quick-drying glue 7 to fix the release fabric layer 4.

[0061] See the appendix Figure 6-7 As shown, the winding production line includes a circumferential winding tooling 8 for laying winding fabric felt and release fabric. The said circumferential winding tooling 8 includes a mounting plate 81, a unwind roller shaft 82, a glue tank 83, a slitting roller 84, and a pressing roller 85. There are two mounting plates 81, which are arranged oppositely; the unwind roller shaft 82 is used to place the fabric felt reel, and its two ends are respectively connected to the two mounting plates 81; the glue tank 83 is used to load the second resin matrix and is fixedly connected to the mounting plate 81 through a first connecting arm 86; the slitting roller 84 is fixedly connected to the mounting plate 81 through a second connecting arm 87; the pressing roller 85 is fixedly connected to the mounting plate 81 through a third connecting arm 88.

[0062] Working principle of the circumferential winding tooling: Install the fabric felt reel onto the unwinding roller shaft 82, adjust it to be parallel and aligned with the cylinder body section of the gas cylinder. Pull out the head of the fabric felt 10, pass it through the guiding roller, and insert it into the gap of the slitting roller 84. Continue to pull it down to the pressing roller 85. Through the pressing roller 85, tightly attach the fabric felt to the gas cylinder, start winding the fabric felt, and simultaneously spray a sufficient amount of resin matrix onto the fabric felt to soak it. When the winding of the fabric felt is completed, cut it off through the slitting roller 84 and stop spraying the resin matrix. When winding the toughening and buffering layer 32 on the inner liner surface, its head end can be fixed by an auxiliary tape; when winding the fabric felt of the interlayer toughening and buffering layer 31, since the fiber 9 is coated with a glue solution, its head end can be effectively attached and fixed to the fiber layer of the gas cylinder. When used for winding the release cloth, remove the fabric felt reel and replace it with the release cloth reel, which can be used for winding the release cloth during tail yarn fixing.

[0063] The above is the preferred embodiment of the present application, which does not limit the protection scope of the present application in sequence. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method for preparing a wound gas cylinder, characterized in that, The wound gas cylinder comprises a gas cylinder liner, a fiber winding layer, and a toughening buffer layer; the fiber winding layer comprises an alternately arranged circumferential winding layer and a spiral winding layer; the circumferential winding layer is arranged in the barrel section of the gas cylinder liner; the spiral winding layer is arranged in the entire length section of the gas cylinder liner; the toughening buffer layer comprises an interlayer toughening buffer layer, and the interlayer toughening buffer layer is arranged in the barrel section between the circumferential winding layer and the spiral winding layer; the fiber winding layer comprises fibers and a first resin matrix; the toughening buffer layer comprises a fabric felt and a second resin matrix; the first resin matrix and the second resin matrix are resins of different systems, and the two different systems of resins form an interpenetrating structure when co-cured; the preparation method comprises the steps of: A fiber winding layer and an interlayer toughening buffer layer are wound on the gas cylinder liner through a winding production line, specifically comprising: winding the fibers impregnated with the first resin matrix alternately around the circumferential winding layer and the spiral winding layer on the gas cylinder liner according to the layer design; during the winding of the transition layer from the circumferential winding layer to the spiral winding layer, or during the winding of the transition layer from the spiral winding layer to the circumferential winding layer, the fabric felt of the interlayer toughening buffer layer is simultaneously wound for N turns, where N is an integer greater than or equal to 1; the fabric felt is cut off before the winding of the transition layer is completed, and the winding of the fabric felt is stopped; and, during the process of winding the fabric felt of the interlayer toughening buffer layer, a sufficient amount of the second resin matrix needs to be sprayed on the fabric felt to penetrate the fabric felt.

2. The manufacturing method of a wrapped gas cylinder according to claim 1, characterized in that, The innermost layer and the outermost layer of the fiber winding layer are both hoop winding layers.

3. The manufacturing method of a wound gas cylinder according to claim 1, characterized in that, The toughened buffer layer also includes an inner liner surface toughened buffer layer, and the inner liner surface toughened buffer layer is arranged on the entire inner liner surface of the gas cylinder.

4. The manufacturing method of a wound gas cylinder according to claim 3, characterized in that, The inner liner surface toughening buffer layer comprises an inner liner surface toughening buffer layer barrel section and end caps at both ends.

5. The manufacturing method of a wrapped gas cylinder according to claim 1, characterized in that, The fabric felt is any one or more of glass fiber felt, carbon felt, and polyester felt, and the second resin matrix includes any one of polyurethane, modified epoxy resin, and acrylate.

6. The manufacturing method of a wound gas cylinder according to claim 4, characterized in that, Before the fiber winding layer begins to be wound, it is also necessary to first provide a liner surface toughening buffer layer on the outer surface of the cylinder liner, which specifically includes the following steps: The fabric felt is placed in a head forming mold to form a head preform; the head preform is then set at the corresponding position of the gas cylinder liner; the fabric felt is then tightly wound around the gas cylinder liner tube, and both sides of the fabric felt are butted against the head preform; and while winding the fabric felt, a sufficient amount of the second resin matrix needs to be sprayed on the fabric felt to saturate the fabric felt.

7. A method for preparing a wound gas cylinder according to claim 1, characterized in that, It also includes the tail yarn fixing, which specifically includes the steps of: Step 1: According to the fiber winding layer design, determine the end position of the fiber of the last fiber winding layer wound around the gas cylinder, so that the fiber after the end position stops infiltrating the resin matrix; Step 2: When the fiber winding of the last fiber winding layer of the wound gas cylinder is completed, the release cloth is wound on the wound gas cylinder from the end position of the fiber, and the fiber that is not impregnated with the resin matrix is continued to be wound while maintaining the winding tension of the wound gas cylinder, so as to form a circumferential dry fiber layer and a release cloth layer with a set width and overlapped and wound on the surface of the wound gas cylinder; Step 3: After the fibers not infiltrated with the resin matrix and the release fabric are overlapped and wound around 1-2 turns, release the winding tension, cut the fibers, then continue to wind at least half a turn with the release fabric overlapped, and then cut the release fabric and fix the end of the release fabric with high-temperature tape; Step 4: Transfer the wound gas cylinder as a whole to an oven for heating and curing; Step 5: After cooling, remove the high-temperature tape, the release fabric layer, and the circumferential dry fiber layer, and a wound gas cylinder with no fiber joints on the surface and a consistently stable tension can be obtained.

8. The manufacturing method of a wound gas cylinder according to claim 1, characterized in that The winding production line includes a circumferential winding tooling. The circumferential winding tooling includes a mounting plate, a unwind roller shaft, a glue tank, a slitting roller, and a pressing roller. There are two mounting plates, which are arranged oppositely; both ends of the unwind roller shaft are fixedly connected to the two mounting plates; first connecting arms are respectively arranged at both ends of the glue tank, and the other ends of the first connecting arms are connected to the mounting plates; the slitting roller is fixedly connected to the mounting plates through second connecting arms; the pressing roller is fixedly connected to the mounting plates through third connecting arms.

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