CN114919204A

CN114919204A - Winding forming method of hydrogen storage tank reinforced by chopped carbon fibers

Info

Publication number: CN114919204A
Application number: CN202210522423.4A
Authority: CN
Inventors: 竺铝涛; 黄泽升; 王佳怡
Original assignee: Zhejiang University Of Technology Shaoxing Keqiao Research Institute Co ltd; Zhejiang Sci Tech University ZSTU
Current assignee: Zhejiang University Of Technology Shaoxing Keqiao Research Institute Co ltd; Zhejiang Sci Tech University ZSTU
Priority date: 2022-05-14
Filing date: 2022-05-14
Publication date: 2022-08-19

Abstract

A winding forming method for a short carbon fiber reinforced hydrogen storage tank full head comprises the following steps: step one, selecting a winding process and a winding mode: adopting a prepreg tape winding process, and selecting a winding mode of circumferential winding and spiral winding; step two, winding process: after a longitudinal/circumferential circulation is wound on the shell, winding a prepreg tape containing short carbon fibers in a circulating longitudinal direction, cutting off fibers at the cylinder section and reserving fibers at the end socket; and thirdly, continuing to wind according to a rule until the specified design layering is achieved, generating a bridging effect between layers in a transition region between the cylinder body of the inner container and the end socket, preventing crack propagation and greatly improving the strength and toughness of the winding layer. The invention can improve the burst pressure and the overall mechanical property of the carbon fiber hydrogen storage tank, fully exert the fiber strength, improve the stress balance coefficient of the shell, reduce the problems of fiber slippage and overhead between the barrel body and the seal head section area, and has the advantages of simple and direct production process, good stability, light weight of products and the like.

Description

Winding forming method of hydrogen storage tank reinforced by chopped carbon fibers

Technical Field

The invention belongs to the field of textile engineering, and relates to a winding forming method of a hydrogen storage tank reinforced by chopped carbon fibers.

Background

The hydrogen storage tank is used as a key part of the hydrogen energy automobile, and the strength and the quality stability of the hydrogen storage tank are the keys of the hydrogen energy automobile. Because 'light weight' is the inevitable trend of future hydrogen energy automobile development, the carbon fiber composite material with light weight and high strength characteristics is the necessary structural composition of the hydrogen storage tank, but the prior art in China produces the hydrogen storage tank which is gradually industrialized from countries in Europe, America, Japan and the like, and has larger differences in hydrogen storage pressure, quality stability and safety. In the face of overseas technical monopoly and blockade, the research and development of a novel high-pressure light-weight fully-composite carbon fiber hydrogen storage tank with independent intellectual property rights becomes one of the current technical difficulties which need to be overcome in China.

For the carbon fiber full-winding gas cylinder with small specification, small diameter and lower working pressure, the thickness of the carbon fiber winding layer is usually 3-5 mm. When this kind of gas cylinder need promote its operating pressure who bears, along with operating pressure's promotion, the whole thickness increase in carbon fiber winding layer, the thickness on hoop winding layer also can corresponding increase, and the increase on hoop winding layer's thickness can lead to spiral winding layer at the vertical spiral winding of low-angle or with high angle spiral winding when, the limit that carbon fiber slip yarn flattened has been surpassed to the built on stilts between hoop winding layer and the spiral winding layer, lead to the winding to end the transition region of the hydrogen storage tank jar body and head to have built on stilts space, spiral winding layer is under the condition that receives interior pressure, the existence in space can lead to the space department to have very big shear stress.

Although the test shell designed according to the network theory is an equal-tension structure, a local force bearing weak area is formed due to the defects of fiber accumulation, overhead and the like near the opening and the stress concentration of a polar hole metal part area. In the past, the solid rocket engine shell wound by the glass fiber glass epoxy composite material is not sensitive to stress concentration, and the end socket does not need to be reinforced under the general condition. The rigidity and the sensitivity to stress concentration of the aramid fiber epoxy composite material are increased, so that the end socket needs to be reinforced, and the rigidity of the current carbon fiber epoxy composite material is higher than that of a glass fiber and aramid fiber composite material, and the current carbon fiber epoxy composite material is more sensitive to stress concentration of the edge of a polar hole metal piece. Practice also proves that the carbon fiber epoxy composite material has the same structure. The test shell is not reinforced by the end socket, and most of the damaged part after hydraulic blasting is generated on the edge of the metal piece, so that the end socket is reinforced.

The transition area of the barrel and the end socket is schematically shown as 3 in figure 1.

The existing seal head reinforcement solutions mainly comprise the following solutions:

(1) the hoop winding layer 1 and the spiral winding layer 2 formed by small-angle longitudinal spiral winding are wound alternately layer by layer as much as possible, so that the overhead area is dispersed as much as possible. The effect of smooth transition is achieved. For example, a certain carbon fiber fully-wound gas cylinder, its design carbon fiber winding layer is spread the layer and is 43 layers hoop layer +10 layers spiral layer, 43 layers hoop layer's total thickness is about 9 ~ 10mm, in order to reduce the hoop layer in the regional overhead space of transition, adopt the method of evenly distributing with hoop layer and spiral layer evenly distributed, just so can reduce the production of making somebody a mere figurehead to a great extent, because carbon fiber winding gauze itself has certain slip under the state that has the glue solution, therefore can fill up the space.

The winding line type is as follows: 4 layers of hoop layer 1 layer spiral layer 4 layer hoop layer 1 layer spiral layer/4 layer hoop layer 1 layer spiral layer/4 layer hoop layer/1 layer spiral layer/3 layers hoop layer, the width of hoop layer winding decreases 1mm or 2mm gradually layer by layer simultaneously.

However, the method not only has complex process adjustment steps, but also makes the overhead among different winding layers more serious, and also increases the use amount of fibers and the quality of the winding layers. As shown in fig. 2, the hoop winding and spiral winding are schematically shown.

(2) The other scheme divides the annular winding layer 1 into 2-5 parts, divides the spiral winding layer 2 formed by small-angle longitudinal spiral winding into 2-5 parts, and adds a plurality of layers of high-angle spiral winding layers 3 in the transition area of the cylinder body and the end enclosure in the winding process. For example, 32 circumferential layers are wound in four sections, 8 layers each, and 10 helical layers are wound in four sections, 2 to 3 layers each. The design line is as follows: 8 layers of circumferential layer/3 layers of spiral layer/1 layer of high-angle spiral layer/8 layers of circumferential layer/2 layers of spiral layer/1 layer of high-angle spiral layer.

However, the method has complicated steps, and the number of the hoop winding layers and the spiral winding layers is strictly controlled on the winding tension and the like. Although the end socket reinforcing and lifting device plays a certain role, the winding layer is thick, and the requirement of light weight is not met. A schematic view of a hoop wound layer 1 and a spiral wound layer 2 is shown in figure 2.

(3) The reinforcement is made into a preset shape on a mould, and is demoulded and trimmed after being solidified and then is attached to the end enclosure.

The scheme is that a front transition assembly is sleeved and fixed at a junction between a front seal head and a cylinder body, and a rear transition assembly is sleeved and fixed at a junction between a rear seal head and the cylinder body. For example, a first annular winding layer is wound on the barrel body between the front transition component and the rear transition component, the thickness of the first annular winding layer is larger than or equal to the wall thickness of the rear end of the front transition component, a small-angle longitudinal spiral winding layer and a second annular winding layer are sequentially wound and wrapped on the annular winding layer, the front end socket and the rear end socket, and the thickness of the second annular winding layer is larger than or equal to 0.

The preparation process of head part is more loaded down with trivial details, and can only be to a certain concrete model hydrogen storage tank inside lining, again because of the difference of fiber resin performance, the thickness and the theoretical value on hoop winding layer have the deviation, can lead to the head part at stack shell and head transition department unsmooth, produce new hole. The addition of the components also increases the weight of the hydrogen storage tank, increasing manufacturing costs. Fig. 3, 4 is a schematic view of the end enclosure with reinforcement shown as the end enclosure reinforcement.

(4) And laying and reinforcing by using cloth.

For example, after the shell completes a longitudinal and circumferential circulation, a layer of weftless tape is laid in a certain width range at the edge of the rear end enclosure metal piece, and the rest winding layer is completed after the tape is pasted. Therefore, the reinforcing layer at the edge of the metal piece is ensured to be arranged in the middle of the winding layer, and the reinforcing layer and the winding layer can be well bonded. After reinforcement, the quality of the shell is increased little, but the stress state of the edge of the metal piece is greatly changed, so that the damage position of the shell after hydraulic blasting is in the barrel section, the state that the blasting position of the shell occurs at the edge of the metal piece is overcome, and the performance of the shell is improved.

However, the explosion position of the shell is close to the equator position on the end socket, and the shell is destroyed by hydraulic explosion, and the appearance is that the falling cylinder section of the end socket is intact, which indicates that the fiber strength can not be fully exerted. Fig. 4 is a schematic diagram of the seal head reinforced by the non-woven belts.

In order to solve the problems in the prior art, the invention provides a winding forming method of a hydrogen storage tank reinforced by chopped carbon fibers.

Disclosure of Invention

The invention provides the winding forming method of the hydrogen storage tank reinforced by the full end enclosure containing the chopped carbon fibers, which has the advantages of simple and direct production process and good stability, enables the product to be light, and can reduce the problems of weak stress and fiber overhead slippage in the end enclosure area.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a winding forming method of a hydrogen storage tank reinforced by end sockets containing chopped carbon fibers comprises the following steps:

step one, selecting a winding process and a winding mode:

adopting a prepreg tape winding process, and selecting a winding mode of circumferential winding and spiral winding;

the circumferential winding is winding along the circumferential direction of the container; during winding, the core mold 12 moves around the axis of the core mold at a constant speed, and the thread guide head 11 moves in a cylinder body section parallel to the axis direction of the core mold; the moving distance of the yarn guide head 11 is one yarn sheet width when the core mold 12 rotates for one circle; the operation is circulated until the yarn sheets are uniformly distributed on the surface of the cylindrical section of the core mold; the circular winding is characterized in that the winding can only be carried out on the barrel body section and can not be wound on the end socket; adjacent yarn sheets are connected without overlapping, and the winding angle of the fiber is usually between 85 and 90 degrees; in order to make the yarn sheets be arranged on the surface of the core mould side by side, the translation of the core mould 12 and the yarn guide head 11 must be ensured, and the mutual coordination of the two movements is ensured;

spiral winding is also called geodesic winding; when winding, the core mould 12 rotates around the axis at a constant speed, the thread guide head 11 reciprocates along the axis direction of the core mould at a specific speed, thus realizing spiral winding on the cylinder body of the core mould 12 and the seal head 11, and the winding angle is about 12-70 degrees; in the case of spiral winding, the filament winding is not only carried out on the shaft section but also on the end closure; the winding process comprises the following steps: starting from a certain point on the circumference of the pole hole 13 at one end of the container, the fibers bypass the end socket along a curve tangent to the pole hole 13 on the curved surface of the end socket, bypass the cylindrical section according to a spiral track, enter the end socket at the other end, return to the cylindrical section, and finally return to the end socket which starts to be wound, and the process is circulated until the surface of the core mold is uniformly full of the fibers;

step two, winding process:

after the shell 5 is wound with a longitudinal/circular circulation, the shell is wound with a circular longitudinal direction;

the circulation longitudinal flow is as follows: in the process of conveying the prepreg tape 8 at a constant speed, opening a short carbon fiber spray gun to spray short fibers 9, enabling the short fibers 9 to be uniformly sprayed into the prepreg tape 8, enabling the prepreg tape 8 to be fully contacted with the short fibers 9 through a heating and pressing roller 10, enabling the short fibers to enter a wire guide head 11 for longitudinal winding after traction and stretching of a tension roller, and subtracting a circular longitudinal cylinder part after winding is completed to only leave two end enclosure parts; circulating in this way; the reinforcement location is between two complete spiral wraps;

and thirdly, continuing to wind according to a rule until the specified design layering is achieved, generating a bridging effect between layers in a transition region between the cylinder body of the inner container and the end socket, preventing crack propagation and greatly improving the strength and toughness of the winding layer.

Compared with the prior art, the invention has the advantages that:

the method has the advantages that 1: the invention discloses a full-sealing-head reinforced carbon fiber full-winding hydrogen storage tank, which comprises: the inner container consists of a cylinder body, a front end socket and a rear end socket, and the yarn belt contains short carbon fibers. And performing cylindrical ring/longitudinal winding on the shell, after the first annular winding is completed, enabling a second longitudinal circulating yarn belt to adopt a yarn belt containing short carbon fibers, cutting off fibers at a cylinder section after the second longitudinal circulating winding is completed, reserving fibers at an end socket, and completing the rest winding layer to enable an end socket reinforcing layer to be in a full end socket reinforcing method between two longitudinal layers.

The method has the advantages that: the chopped carbon fibers are reasonably dispersed, the conventional winding process is not changed, a mold is not opened additionally for preparing the mold, the method is simple and pollution-free, and chemical modification and the like are not involved.

The method has the advantages that: the invention can improve the burst pressure and the overall mechanical property of the carbon fiber hydrogen storage tank, fully exert the fiber strength, improve the stress balance coefficient of the shell, and reduce the problems of fiber slippage and overhead between the barrel body and the head sealing section area.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a transition section area of a cylinder body and a seal head of the invention;

FIG. 2 is a schematic view of the hoop winding, spiral winding and end enclosure structure of the present invention;

FIG. 3 is a schematic view of the head reinforcing structure of the present invention;

FIG. 4 is a schematic view of a reinforced seal head structure of the weftless tape of the present invention;

FIG. 5 is a schematic view of a chopped carbon fiber full-seal reinforcement structure of the present invention;

FIG. 6 is a schematic representation of a staple fiber prepreg tape filament winding preparation of the present invention;

description of reference numerals: 1. a hoop winding layer; 2. a longitudinally wound layer; 3. a transition section area of the cylinder body and the end socket; 4. a seal head reinforcement; 5. an inner container; 6. a weftless tape; 7. short fiber is wound on the end socket; 8. pre-soaking the belt; 9. a short fiber spray gun; 10. heating the pressure roller; 11. a thread guide head; 12. a core mold; 13. a pole hole.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings, in order that the present disclosure may be more fully understood and fully conveyed to those skilled in the art. While the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the invention is not limited to the embodiments set forth herein.

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

A winding forming method of a hydrogen storage tank reinforced by chopped carbon fibers comprises the following steps:

step one, selecting a winding process and a winding mode.

By adopting the prepreg tape winding process, the equipment is simpler, the quality of the prepreg tape is uniform, and the phenomenon that the fibers are not matched with the resin system in the conventional wet winding process is reduced. The winding mode selects hoop winding and spiral winding, and the winding process is schematically shown in figure 6.

The hoop winding is winding in the circumferential direction of the container. During winding, the core mold 12 moves around the axis at a constant speed, and the thread guide head 11 moves in the cylinder body section parallel to the axis direction of the core mold. The moving distance of the wire guide head 11 is one yarn sheet width every time the core mould 12 rotates for one circle. And circulating the steps until the yarn sheets are uniformly distributed on the surface of the cylindrical section of the core mold. The circular winding is characterized in that the winding can be only carried out on the barrel body section and can not be wound on the end socket. Adjacent yarn sheets are contiguous without overlapping and the wrapping angle of the fibers is typically between 85 and 90. In order to allow the pieces of yarn to fill the mandrel surface one by one, it is necessary to ensure that the mandrel 12 and the godet 11 translate, ensuring that the two movements are coordinated.

Spiral winding is also known as geodesic winding. When winding, the core mould 12 rotates around the axis at a constant speed, the thread guide head 11 reciprocates along the axis direction of the core mould at a specific speed, thus realizing spiral winding on the cylinder body of the core mould 12 and the seal head 11, and the winding angle is about 12-70 degrees. In the case of spiral winding, the filament winding is not only carried out on the shaft section but also on the end closure. The winding process comprises the following steps: the fiber starts from a certain point on the circumference of the pole hole 13 at one end of the container, bypasses the end socket along a curve tangent to the pole hole 13 on the curved surface of the end socket, bypasses the cylindrical section according to a spiral track, enters the end socket at the other end, returns to the cylindrical section, finally bypasses the end socket which starts to wind, and circulates in the same way until the surface of the core mold is uniformly distributed with the fiber.

The winding pattern is schematically shown in fig. 2.

And step two, winding process.

After the shell 5 is wound with a longitudinal/circumferential cycle, a cycle longitudinal direction is wound, and the cycle longitudinal flow path is as follows: in the process of conveying the prepreg tape 8 at a constant speed, opening a short carbon fiber spray gun to spray short fibers 9, enabling the short fibers 9 to be uniformly sprayed into the prepreg tape 8, enabling the prepreg tape 8 to be fully contacted with the short fibers 9 through a heating and pressing roller 10, enabling the prepreg tape 8 to enter a godet 11 for longitudinal winding after traction and stretching of a tension roller, and subtracting a circular longitudinal cylindrical part after winding is completed to only leave two end enclosure parts. Thus circulating. The reinforcement location is between two complete spiral wraps; the winding flow diagram is shown in fig. 3.

And thirdly, continuing winding according to a rule until a specified design layering is achieved, and generating a bridging effect between layers in a transition region between the cylinder body of the inner container and the end socket so as to prevent crack propagation and greatly improve the strength and toughness of a winding layer.

The designed explosion pressure of the cylinder body section is pb, the known fiber ultimate stress is sigma, the radius R of the cylinder body section of the gas cylinder and the fiber winding angle alpha of the cylinder body section are obtained, and after the radius R of the cylinder opening is the radius of the cylinder opening, the spiral winding thickness, the thickness of the annular winding layer and the spiral winding angle of the cylinder body section can be calculated according to the grid theory and the known working condition:

calculation formula of thickness of spiral winding:

the calculation formula of the thickness of the hoop winding layer is as follows:

the calculation formula of the spiral winding angle of the barrel section is as follows:

the equipment for preparing the continuous short fiber reinforced thermoplastic polymer prepreg tape comprises (as shown in figure 6 below), and the equipment structure consists of a prepreg tape 8, a short fiber spray gun 9, a heating and pressing roller 10, a tension roller, a wire guide head 11 and a core die 12. Wherein: a short fiber spray gun 9 is arranged at the rear part of the prepreg tape 8, a heating and pressing roller 10 is arranged at the rear part of the short fiber spray gun 9, and a tension roller is arranged at the rear part of the heating and pressing roller 10; the bottom of the tension roller is provided with a wire guide head 11 and a core mold 12; in the process of conveying the prepreg tape 8 at a constant speed, opening a short carbon fiber spray gun to spray short fibers 9, enabling the short fibers 9 to be uniformly sprayed into the prepreg tape 8, enabling the prepreg tape 8 to be in full contact with the short fibers 9 through a heating and pressing roller 10, and enabling the short fibers to enter a wire guide head 11 for longitudinal winding after being drawn and stretched by a tension roller.

As shown in fig. 1, 2, 5 and 6, a chopped carbon fiber-reinforced hydrogen storage tank according to the present invention includes: a hoop winding layer 1; the longitudinal winding layer 2, the inner container 5 and the short fiber winding end socket 7. Other structures on the hydrogen storage tank are conventional structures and will not be described in detail herein.

As shown in fig. 1 and 2, the circumferential winding layer is wound on the barrel body, the longitudinal winding layer is wound on the end sockets except the barrel body, the winding process is firstly circumferential winding and then longitudinal winding, and the wall thickness of the end socket and the barrel body transition region 3 is greater than that of the barrel body. The optimal scheme is that the end socket and the transition area of the barrel body have no fiber overhead slippage and are in smooth contact transition with the barrel body section.

As shown in fig. 5 and 6, after the casing 5 is wound by one longitudinal/circumferential cycle, the longitudinal direction is wound by one cycle, and the flow of the longitudinal direction is as follows: in the process of conveying the prepreg tape 8 at a constant speed, opening a short carbon fiber spray gun to spray short fibers 9, enabling the short fibers 9 to be uniformly sprayed into the prepreg tape 8, enabling the prepreg tape 8 to be in full contact with the short fibers 9 through a heating and pressing roller 10, enabling the short fibers to enter a wire guide head 11 for longitudinal winding after traction and stretching of a tension roller, and subtracting a circular longitudinal cylinder part after winding is completed to only leave two end enclosure parts. Thus circulating. The best proposal is that the full short fiber reinforced seal head can be tightly attached to the transition area of the seal head and the cylinder body and smoothly contacted and transited with the cylinder body section.

The spraying of the short fibers is controlled by a spray gun 9, the spraying speed needs to be matched with the conveying speed of the prepreg tape, and the spraying angle can adopt multi-angle spraying to ensure that the short fibers are uniformly dispersed and laid on the prepreg tape.

In this embodiment, the width of the tape containing the short fiber prepreg tape 8 is the same as that of the circularly/longitudinally wound prepreg tape 8, and only the winding of the full-short carbon fiber winding end socket is needed to open the spray gun 9.

Comparative example 1

A35 MPa hydrogen storage tank with a III type fully-wound aluminum inner container is purchased on the market, and through a bursting test, the bursting pressure is between 35 and 45MPa and is far less than 53.5 MPa.

Example 1

The hydrogen storage tank prepared according to the invention is subjected to a blasting test:

the explosion position of the shell is the center of the gas cylinder, and the explosion pressure is 53.5 Mpa.

The fiber winding near the transition section area is thick, and no damage is generated.

The reinforcing effect is influenced by the winding angle of the short fiber reinforced full seal head, and the pressure-resistant effect is improved by 15-20%.

For example, 12 layers are wound, and the bursting pressure after every 3 layers (1-2-3-reinforcement-4-5-6-reinforcement-7-8-9-reinforcement-10-11-12) are reinforced by short fibers is 53.5 MPa; every 3 layers of reinforcement (1-2-reinforcement-3-4-reinforcement-5-6-reinforcement-7-8-reinforcement-9-10-reinforcement-11-12) and the bursting pressure is 50.2 MPa; the burst pressure is 46.6MPa without reinforcement.

Short fiber reinforced full plugs improve the degree of fiber damage near the equator, whether the maximum stress is transferred to the cylindrical portion, and maintain the safety of the burst mode.

Consumption of materials such as carbon fiber and resin. The winding and forming of the gas cylinder takes 2 days, the consumption of the carbon fiber is 28.5kg, and the consumption of the resin is 20.78 kg.

Compared with the blasting test data of the comparative example 1, the carbon fiber fully-wound gas cylinder prepared by the winding forming method has the following advantages:

the method has the advantages that: the full-short carbon fiber winding end socket enables stress in a transition area between the end socket and the cylinder body to be smooth, when the gas cylinder is subjected to internal pressure, the transition area between the end socket and the cylinder body does not generate stress concentration, so that the shearing stress of the transition area is greatly reduced, the problem that the strength exertion rate of carbon fibers of a spiral winding layer is reduced due to stress concentration is avoided, the strength of the carbon fibers of the spiral winding layer can be fully exerted, a plurality of spiral winding layers are not required to be additionally arranged to reinforce the transition area, and the use amount of the carbon fibers in the spiral winding direction is reduced; in addition, the smooth stress of the transition area can also ensure that the bursting pressure and the fatigue pressure of the gas cylinder are more stable and reliable, and the comprehensive performance of the gas cylinder is greatly improved.

The method has the advantages that: in the process of carbon fiber winding, the annular winding layer cannot slide to the seal head area, the circular longitudinal cylinder part is subtracted, and only two reinforced seal head parts are left for processing, so that the integral structure of the hydrogen storage tank is stable. By combining the advantages 1, the fatigue strength of the gas cylinder is ensured, fatigue leakage points are prevented from occurring in the transition region 3 of the end socket cylinder body, and the fatigue strength and the stability of the gas cylinder are effectively enhanced; in addition, the use amount of the carbon fibers in the circumferential winding direction and the spiral winding direction is reduced on the basis of ensuring the bursting strength and the fatigue performance of the gas cylinder, and finally the overall quality and the manufacturing cost of the gas cylinder are reduced.

The structure of this scheme be applicable to on the metal inner bag carbon fiber twines the gas cylinder entirely, also be applicable to on the plastics inner bag carbon fiber twines the gas cylinder entirely.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described above with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the above detailed description of the embodiments of the invention presented in the drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.

Claims

1. A winding forming method of a hydrogen storage tank reinforced by chopped carbon fibers is characterized by comprising the following steps:

step one, selecting a winding process and a winding mode:

the circumferential winding is winding along the circumferential direction of the container; during winding, the core mold (12) moves around the axis of the core mold at a constant speed, and the thread guide head (11) moves in a cylinder body section parallel to the axis direction of the core mold; the moving distance of the yarn guide head (11) is one yarn sheet width every time the core mould (12) rotates for one circle; the operation is circulated until the yarn sheets are uniformly distributed on the surface of the cylindrical section of the core mold; the circular winding is characterized in that the winding can only be carried out on the barrel body section and can not be wound on the end socket; adjacent yarn sheets are connected without overlapping, and the winding angle of the fiber is usually between 85 and 90 degrees; in order to enable the yarn sheets to be distributed on the surface of the core mould in a piece-by-piece mode, the core mould (12) and the yarn guide head (11) must be ensured to translate, and the two motions are ensured to be coordinated with each other;

spiral winding is also called geodesic winding; when winding, the core mould (12) rotates around the axis at a constant speed, and the thread guide head (11) reciprocates along the axis direction of the core mould at a specific speed, so that spiral winding is realized on the cylinder body and the seal head (11) of the core mould (12), and the winding angle is about 12-70 degrees; in the case of spiral winding, the fiber winding is not only carried out on the shaft section but also on the end closure; the winding process comprises the following steps: starting from a certain point on the circumference of a polar hole (13) at one end of the container, the fibers bypass the end enclosure along a curve tangent to the circle of the polar hole (13) on the curved surface of the end enclosure, bypass the cylindrical section according to a spiral track, enter the end enclosure at the other end, return to the cylindrical section, and finally return to the end enclosure which starts to be wound, and the process is circulated until the surface of the core mold is uniformly full of the fibers;

step two, winding process:

after the shell (5) is wound with a longitudinal/circular circulation, the shell is wound with a circular longitudinal direction;

the circulation longitudinal flow is as follows: in the process of conveying the prepreg tape (8) at a constant speed, opening a short carbon fiber spray gun to spray short fibers (9), enabling the short fibers (9) to be uniformly sprayed into the prepreg tape (8), enabling the prepreg tape (8) to be fully contacted with the short fibers (9) through a heating and pressing roller (10), enabling the prepreg tape (8) to enter a yarn guide head (11) to be longitudinally wound after being drawn and stretched by a tension roller, and subtracting a circular longitudinal cylinder part after winding is finished to only leave two end enclosure parts; so as to circulate; the reinforcement location is between two complete spiral wraps;

2. The winding method of a hydrogen storage tank reinforced with chopped carbon fibers as claimed in claim 1, wherein: the designed explosion pressure of the cylinder body section is pb, the known fiber ultimate stress is sigma, the radius R of the cylinder body section of the gas cylinder and the fiber winding angle alpha of the cylinder body section are obtained, and after the radius R of the cylinder opening is the radius of the cylinder opening, the spiral winding thickness, the thickness of the annular winding layer and the spiral winding angle of the cylinder body section can be calculated according to the grid theory and the known working condition:

calculation formula of thickness of spiral winding:

3. the winding method of a hydrogen storage tank reinforced with chopped carbon fibers as claimed in claim 1, wherein: the equipment for preparing the continuous short fiber reinforced thermoplastic polymer prepreg tape comprises the following components: a prepreg tape (8), a short fiber spray gun (9), a heating and pressing roller (10), a tension roller, a wire guide head (11) and a core mold (12);

wherein: a short fiber spray gun (9) is arranged at the rear part of the prepreg tape (8), a heating and pressing roller (10) is arranged at the rear part of the short fiber spray gun (9), and a tension roller is arranged at the rear part of the heating and pressing roller (10); the bottom of the tension roller is provided with a yarn guide head (11) and a core die (12); in the uniform-speed conveying process of the prepreg tape (8), the short carbon fiber spray gun is opened to spray short fibers (9), so that the short fibers (9) are uniformly sprayed into the prepreg tape (8), and then the prepreg tape (8) is fully contacted with the short fibers (9) through the heating and pressing roller (10), and enters the wire guide head (11) for spiral winding after being drawn and stretched by the tension roller.