CN117301592A - A method for preparing a fully composite hydrogen storage bottle with a plastic liner and carbon fiber wrapping for vehicles - Google Patents

Abstract

The invention discloses a method for preparing a fully composite material hydrogen storage bottle for vehicles with a plastic liner wrapped with carbon fibers, which belongs to the cross-technical field of composite material processing and high-pressure vessel manufacturing. The invention can improve the manufacturing process of the dry yarn pressure vessel by pre-embedding the implanted metal parts and blow-molding the plastic liner, and the dry yarn winding is strengthened. In actual projects, it can improve product performance, shorten the design cycle, reduce design costs, and improve The good impact resistance and low-temperature environment adaptability of the wound pressure vessel, through the winding process of dry yarn and the absence of subsequent curing process, make it have the characteristics of high molding efficiency and recyclability after service period. Compared with traditional metal-based pressure vessels, the pressure vessel in the present invention uses plastic as the lining and then uses high-performance carbon fiber and resin matrix to compositely mold it. Compared with traditional metal-based pressure vessels, it has high specific stiffness, high specific strength, strong designability, corrosion resistance, and good fatigue performance. Advantages: It can be widely used in aerospace, transportation, marine shipbuilding and other industrial fields.

Description

A method for preparing a fully composite hydrogen storage bottle with a plastic liner and carbon fiber wrapping for vehicles

Technical field

The invention relates to a method for preparing a fully composite material hydrogen storage bottle for vehicles with a plastic liner and carbon fiber winding. Specifically, it relates to plastic processing and carbon fiber winding technology, and belongs to the cross-technical field of composite material processing and high-pressure vessel manufacturing.

Background technique

Hydrogen energy, as an important secondary energy source with a wide range of sources, efficient and clean, has gradually become an important direction of the global energy technology revolution. It has been used in new energy vehicles as a new clean energy source. The hydrogen supply system of a hydrogen bottle hydrogen fuel vehicle is one of the important components of the vehicle. 1. It mainly has the functions of high-pressure compressed hydrogen filling, storage, supply, pressure reduction, overpressure release, safe flow limiting and low-pressure output to meet the hydrogen supply and consumption needs of hydrogen fuel vehicles. Hydrogen cylinders are the supply for hydrogen fuel cell vehicles. An important component of the hydrogen system, it has broad application prospects in energy, transportation, industry, construction and other fields.

High-pressure hydrogen storage pressure vessels are indispensable and important equipment for hydrogen energy storage and transportation. Among them, steel-belt staggered high-pressure hydrogen storage vessels rely on their completely independent intellectual property rights, mature theoretical technology and excellent comprehensive performance and other technical advantages to be used in hydrogen storage vessels. Widely used, the main material selection of steel strip staggered high-pressure hydrogen storage pressure vessels is discussed from the perspective of equipment design.

Hydrogen bottles are one of the important components of the hydrogen supply system of hydrogen fuel vehicles. They have met the hydrogen supply and consumption needs of hydrogen fuel cell vehicles. Hydrogen bottles have high pressure to carry compressed hydrogen, light weight and high hydrogen storage density. Performance characteristics, fixed on road vehicles, used for hydrogen fuel storage and refillable. The filling pressure of hydrogen bottles is generally between 35∽70MPa. The structure of the gas cylinder is divided into steel-lined fiber-wound composite gas cylinders (Type II gas cylinders), aluminum-lined carbon fiber fully-wound composite gas cylinders (Type III gas cylinders) and plastic-lined carbon fiber fully-wound composite gas cylinders (Type IV gas cylinders). ), so the high-pressure hydrogen cylinder is a key component of the hydrogen supply system of hydrogen fuel cell vehicles.

A lot of research has been carried out in the field of composite pressure vessels at home and abroad. Someone used four methods to optimize the dry yarn winding finite element model and predicted the explosion failure of the gas cylinder at the valve position. According to the real path of fiber winding, a yarn unit-based composite material layer simulation theory was proposed to analyze the linear pattern of natural fiber winding LPG containers. And a corresponding winding system was developed. The mesoscopic model and laminate theory were established to propose an equivalent stiffness calculation method for the cross-undulating area of winding composite materials. According to the design requirements of the dry yarn winding forming process, the present invention designed a fully automatic composite gas cylinder winding and forming production line system. , the equilibrium conditions of dry yarn winding in the tangential plane and the normal plane of the cylindrical shell were derived, and a mechanical model of dry yarn winding was established.

Scholars around the world have conducted extensive research on the mechanical theory and winding process of dry yarn winding, but less research has been done on the mesoscopic modeling and corresponding strength analysis of the overall structure of dry yarn wound gas cylinders.

Contents of the invention

Aiming at the field of low-pressure storage of liquid media used in pressure vessels, the main purpose of the present invention is to provide a method for preparing a fully composite hydrogen storage bottle with a plastic liner wrapped with carbon fiber for use in vehicles. The metal parts are pre-embedded and the plastic liner is blow-molded. Dry yarn winding reinforcement is the key technology of the present invention. Plastic is used as the lining, and then high-performance carbon fiber and resin matrix are compositely molded to form a pressure vessel. The pressure vessel is a plastic-lined carbon fiber-wrapped vehicle full composite material hydrogen storage bottle. . Compared with traditional metal-based pressure vessels, the invention has the advantages of high specific stiffness, high specific strength, strong designability, corrosion resistance, and good fatigue performance.

The object of the present invention is achieved through the following technical solutions.

The invention discloses a method for preparing a fully composite hydrogen storage bottle with a plastic liner and carbon fiber winding for vehicles, which includes the following steps:

The blow molding material is made of nylon 66, a mixture of high-density polyethylene and low-density polyethylene, and one of polypropylene; the structural embedded parts are made of metal gas bottle mouth threaded structural parts, and the non-threaded parts are embedded Embedded corners of the blow molding layer.

The first step is to embed structural parts and blow molding - prepare the plastic liner

30CrMnSi is used to prepare the embedded structural parts. The thread of the threaded interface is M20X1.5mm-M40x2.5mm. The outer surface is knurled. The length of the embedded structural parts is 80mm-120mm. The length of the threaded part is 20mm-40mm. The non-threaded part is flanged. Plum blossom shape, standby; connect the blow molding mechanism to the discharge port of the twin-screw machine, set the temperature control range of the twin-screw machine according to Table 1, add blow molded plastic to the feeding port of the twin-screw machine, and heat it to the predetermined temperature , the blow molding pressure condition is:

Main oil pump pressure (P1): 9-18MPa

Clamping pressure (P2): 12-19MPa

Servo pump pressure (P3): 9-18MPa

Pneumatic system pressure (P4): 0.5-0.9MPa

Low pressure blowing pressure (P5): 0.15-0.55MPa

High pressure blowing pressure (P6): 0.5-1.6MPa

Table 1 Temperature control of deflector molding during blow molding of liner (unit: °C)

The second step is to hang glue on the surface of the plastic liner.

Fix the blow molded plastic liner that has passed the inspection on the winding machine, and evenly apply 0.06-0.15mm thick glue on the surface of the plastic liner. The glue composition is: E128 epoxy resin 55-62%, E51 epoxy resin 25-32%, carboxyl nitrile rubber or carboxyl nitrile rubber liquid 2-8%, 650 polyamide 6-12%, tetramethylimidazole 0.5-6%.

The third step is to wind the bottom layer of carbon fiber and dry fiber on the surface of the plastic liner.

Dry fiber winding molding technology is improved from traditional winding technology. Traditional filament-wound composite materials are composed of resin and fibers. The fibers are used to bear the tensile load along the fiber direction. The resin is used to fix the fibers and bear and transmit the shear load, or interlaminar stress. If the shape of the product is an isotonic product and geodesic winding (the shortest distance between two points on the surface of the product) is used, the fiber will only bear tensile load, so even if there is no resin, the fiber will not slip or move. Two designs that are critical to the success of the enhanced winding process are the geodesic path and the isotonic model.

The geodesic path is the shortest path between two points on the winding surface. In reinforced structures, geodesics ensure the effective use of reinforcing fibers. Through the isotonic model, the internally generated stress is converted into a constant stress arranged in the fiber direction across the entire winding surface. The fibers on the winding surface only bear tensile strength, and the product will not be deformed due to the influence of internal pressure. The fiber direction is optimized through the combination of geodesic path and equal tension winding.

sinα ₀ = r0 /R (1)

Unfold the fibers wrapped around the barrel section, and use the pitch method to obtain the center angle equation of the barrel section of the pressure vessel:

γ = Ltanα ₀ / πD × 360° (2)

Cut any axial section of the barrel section and substitute equation (2) into the trajectory point equation of any point of the winding fiber in the barrel section, that is, the fiber trajectory equation of the head section.

Take a meridian r=r(z) at the head and rotate it 360° along the z-axis to obtain the head rotation surface in Figure 3. The surface rotation equation is: r(θ, z) = (rcosθ, rsinθ, z). Extract a curve C on the surface, and extract a point P on the curve C to study its geodesic curvature and normal curvature.

During the winding and forming process, the yarn starts from the end of the pole hole, goes through a complete cycle and returns to the starting point by one yarn width, and then goes through several complete cycles to fill the lining.

As a preferred option, MATLAB software is used to simulate the trajectory of dry yarn winding. First, according to the geometric dimensions of the mold, the geometric parameters of the head and barrel parts are entered in the command box of MATLAB, and then the geometric model of the lining is established through code programming, and the geometric model of the winding trajectory is established based on the fiber trajectory equation. The trajectory equation of the barrel section is a conventional basic equation, which can be written directly in the program, while the center angle of the head section is a second-order differential equation, which is solved using the fourth-order Runge-Kutta method. Here, the ode45 that comes with MATLAB is used function to solve. Measure the pole hole radius r ₀ =17mm, and the yarn width b =2-6mm. From formula (1), we can get the winding angle α ₀ =6-15°, and select the number of tangent points n=7. According to the obtained trajectory equation and winding parameters, draw the line diagram of the dry yarn winding line pattern in one cycle, five cycles and full fiber conditions.

Fiber-reinforced plastics consist of a plastic lining and reinforcements that enable flexibility through a high strength ratio.

High strength and stiffness are provided through reinforced materials, while plastic itself is relatively poor in strength and stiffness. Therefore, high strength is required during the production process. By designing the optimal model shape and fiber winding trajectory path, the fiber only bears tensile stress and the fiber exerts its full potential. 100% functional, with the fiber structure bearing all the forces in the stated shape. Therefore, the plastic lining does not bear absolute pressure and plays a sealing role at critical times.

The molding of traditional composite pressure vessels mostly uses wet methods in which fibers are impregnated with resin and semi-dry winding processes in the form of prepreg tapes. Due to the brittleness of the resin matrix, the molding process is often affected by impact loads or low temperature environments. The structural layer is prone to failure modes such as matrix cracking and delamination, fiber-matrix interface debonding, etc., which affects the load-bearing performance of the gas cylinder. In addition, traditional composite pressure vessels also have problems such as complex molding processes, poor working environment, unstable product quality, and difficulty in product recycling and reuse. This invention is essentially different from the traditional manufacturing of composite pressure vessels. The metal parts are pre-embedded and blow molded into the plastic liner. Dry yarn winding reinforcement is the key technology of the invention. Plastic is used as the lining and high-performance carbon fiber is used. Compared with traditional metal-based pressure vessels, pressure vessels compositely formed with resin matrix have the advantages of high specific stiffness, high specific strength, strong designability, corrosion resistance, and good fatigue performance. They are widely used in aerospace, transportation, marine ships, etc. It has been widely used in industrial fields. In recent years, in the field of low-pressure storage of liquid media, the research on dry yarn-wrapped pressure vessels has gradually attracted the attention of scholars in this field around the world. It is a polymer material with anti-seepage and sealing functions for the lining, and the fibers are not impregnated. It is a pressure vessel that is wound on the lining in a geodesic manner under the condition of resin, and the outer layer is coated with a silicone rubber or fluororubber protective layer. The good impact resistance and low-temperature environment adaptability of dry yarn winding pressure vessels can well solve the problems faced by pressure vessels. The dry yarn winding process and no subsequent curing process make it have high molding efficiency and long service life. Recyclable features.

The fourth step is to apply a surface protective layer

After the dry yarn winding is completed, the surface is coated with silicone rubber or fluororubber solution to form an elastic protective layer with a thickness of 2-6mm on the surface, thereby obtaining a fully composite hydrogen storage bottle.

Beneficial effects:

1. The present invention discloses a method for preparing a fully composite hydrogen storage bottle with a plastic liner and carbon fiber winding for vehicles. By pre-embedding and implanting metal parts and blow molding the plastic liner, the dry yarn winding is enhanced, which can improve the dry yarn pressure vessel. The manufacturing process is of great significance in improving product performance, shortening the design cycle, and reducing design costs in actual engineering. It improves the good impact resistance and low-temperature environmental adaptability of the wound pressure vessel. Through the winding process of dry yarn and no follow-up The curing process makes it have the characteristics of high molding efficiency and recyclability after service period.

2. The present invention discloses a method for preparing a fully composite hydrogen storage bottle with a plastic liner wrapped with carbon fiber for use in vehicles. The metal parts are pre-embedded and blow-molded into the plastic liner. Dry yarn winding reinforcement is the key technology of the present invention. Through Compared with traditional metal-based pressure vessels, pressure vessels made of plastic as lining and then compounded with high-performance carbon fiber and resin matrix have the advantages of high specific stiffness, high specific strength, strong designability, corrosion resistance, and good fatigue performance. It is widely used in aerospace, transportation, marine shipbuilding and other industrial fields.

Description of the drawings

Figure 1 The shape and structure of the plastic liner after blow molding;

Figure 2 Any axial cross-section of the barrel section;

Figure 3 Any axial section of the barrel section;

Figure 4: Head winding rail pole structure;

Figure 5 Head winding coordinates;

Figure 6 Linear structure at the head;

Figure 7 Linear structure of the winding cylinder.

Detailed ways

The content of the present invention will be further described below in conjunction with examples.

Example 1

Dry yarn winding is one of the core technologies of the gas cylinder molding process. The present invention is a manufacturing method for a 45L automotive 70MPa compressed hydrogen plastic liner carbon fiber fully wound composite gas cylinder (Type IV gas cylinder) product.

The structural embedded part of the present invention is made of metal material gas bottle mouth threaded structural parts, and the non-threaded part is embedded in the embedded angle of the blow molding layer.

The first step is to embed structural parts and blow molding - prepare the plastic liner

30CrMnSi is used to prepare the embedded structural parts. The thread of the threaded interface is M20 The parts are ready for use; add the blow-molded plastic to the feeding port of the twin-screw machine and heat it to the predetermined temperature. The plastic liner blow molding material is a mixture of high-density polyethylene and low-density polyethylene, and the mixing ratio is high-density polyethylene 86.6%. , low-density polyethylene 13.4%, set the temperature control range of the twin-screw machine (Table 2), connect the blow molding mechanism at the outlet end of the twin-screw machine, fix the metal embedded workpiece and connect and fix it with the blow molding interface end. Blow molding pressure conditions are:

Main oil pump pressure (P1): 9.5MPa

Clamping pressure (P2): 12MPa

Servo pump pressure (P3): 10.2MPa

Pneumatic system pressure (P4): 0.76MPa

Low pressure blowing pressure (P5): 0.32MPa

High pressure blowing pressure (P6): 0.89MPa

Table 2 Blow molding temperature control (unit °C)

The wall thickness of the blow-molded plastic liner of the present invention is 3.5mm, which can be used after shaping;

The second step is to fix the plastic liner and hang glue on the surface.

Fix the plastic liner that has passed the blow molding test on the winding machine, and apply glue evenly on the surface of the plastic liner with a thickness of 0.08mm. The glue composition is: E128 epoxy resin 61.5%, E51 epoxy resin 26.5% , Carboxy-butadiene rubber (liquid) 2.2%, 650 polyamide 7.2%, tetramethylimidazole 2.6%;

The third step is to wind the bottom layer of carbon fiber and dry fiber on the surface of the plastic liner.

In order to verify that the designed winding line type can achieve the two conditions of uniform fiber distribution and stable winding, the present invention performs dry yarn winding on the pressure vessel by inputting the winding parameters determined during line type design. The dry fiber winding forming technology is based on the traditional Improved winding technology. Traditional fiber-wound composite materials are composed of resin and fiber. The fiber is usually used to bear the tensile load along the fiber direction, and the resin is used to fix the fiber and bear and transmit the shear load, or interlayer stress; the winding equipment uses a seven-degree-of-freedom Robot winding workstation (six-axis robot + rotating spindle); the winding fiber uses T800 grade carbon fiber; input the geometric dimensions and winding parameters of the lining into the CNC system terminal. The geometric dimensions include pole hole and barrel diameter, head height, and barrel body length, select the geodesic winding method, enter the winding angle as 11°, the yarn width as 4.2mm, the number of tangent points as 7, and the winding tension as 40N; debug the winding machine after clamping the lining, and calibrate the origin coordinates of the robot workstation. According to the lining The position determines the initial position of the robot winding and other machine tool parameters. In order to improve the success rate of yarn winding during the winding process, first set the silk nozzle to move back and forth without threading yarn, adjust the movement trajectory of the silk nozzle, and check the winding of the silk nozzle. Is the distance between the starting point and the static coordinate origin of the machine tool appropriate? If the nozzle trajectory deviates greatly from the ideal effect, adjust the coordinates of the winding starting point and the length of the hanging yarn to make the nozzle motion trajectory close to the ideal position. After 18 complete cycles, The fibers are evenly covered on the surface of the lining. In the case of continuous yarn, the above winding parameters are used to continue to complete the winding of the second spiral layer to verify the stability of the winding between fiber layers. During the winding process, the relationship between the fiber and the lining and the fiber and the fiber is There is no obvious slip phenomenon between the fibers. After the winding is completed, the fiber position is stable and evenly covered with the lining, which verifies the feasibility of the dry yarn winding cylinder of the present invention; the spiral winding is a 7 tangent point line type, and the fibers are controlled to and fro at the silk nozzle for 7 After 126 round trips, the fibers were staggered by a distance of yarn width. After 126 round trips, the fibers were evenly covered in the lining, and the fiber layer filling period was short during the winding process. The winding parameters were at radius r ₀ = 16 mm, and yarn width b = 4.2mm, the winding angle α ₀ =11°, select the number of tangent points n=7, and the winding tension is 40N. According to the trajectory equation and winding parameters, the dry yarn winding line shape is obtained in one cycle, five cycles and fiber full conditions. Line graphs are shown in Figures 6 and 7.

Step 4: Apply surface protective layer

After the winding of the dry yarn is completed, the surface layer is coated with a fluororubber solution. The composition of the fluororubber solution is: F2143:ethyl acetate=22:78. After the solvent evaporates, a 3.5mm thick elastic protective layer is formed on the surface to obtain a full composite Material hydrogen storage bottle.

The 45L plastic inner full-wound gas cylinder manufactured by the present invention was tested after 24 hours of surface drying. The three pressure test burst detection values were 102.6MPa. The 24h pressure holding value was 101.9MPa, the 101.8MPa pressure holding 24h pressure value was 101.2MPa and 105.9 The pressure value of MPa pressure holding for 24 hours is 105.3MPa, which can ensure safe use under 70MPa.

The dry yarn winding pressure vessel of the present invention has high molding efficiency due to the dry yarn winding process and no subsequent curing process, which further verifies that the dry yarn winding pressure vessel has high molding efficiency, clean molding environment, good impact resistance and low temperature environment. It has good adaptability, solves the problems faced by pressure vessels, and can be recycled after service.

Example 2

Dry yarn winding is one of the core technologies of the gas cylinder molding process. The present invention is a manufacturing method for a 35MPa compressed hydrogen plastic liner carbon fiber fully wound composite gas cylinder (Type IV gas cylinder) product for a 150L bus.

The structural embedded part of the present invention is made of metal material gas bottle mouth threaded structural parts, and the non-threaded part is embedded in the embedded angle of the blow molding layer.

The first step is to embed structural parts and blow molding - prepare the plastic liner

30CrMnSi is used to prepare the embedded structural parts. The thread of the threaded interface is M30 The parts are ready for use; add blow-molded plastic to the feeding port of the twin-screw machine and heat it to the predetermined temperature. The plastic liner blow molding material is a mixture of nylon 66 and EVA. The mixing ratio is nylon 66 95% and EVA 5%. Set the twin-screw Machine temperature control range (Table 3), connect the blow molding mechanism to the outlet end of the twin-screw machine, fix the metal embedded workpiece and connect and fix it with the blow molding interface end. The blow molding pressure conditions are:

Main oil pump pressure (P1): 10.3MPa

Clamping pressure (P2): 15MPa

Servo pump pressure (P3): 11.2MPa

Pneumatic system pressure (P4): 0.86MPa

Low pressure blowing pressure (P5): 0.38MPa

High pressure blowing pressure (P6): 0.92MPa

Table 3 Blow molding temperature control (unit °C)

The wall thickness of the blow-molded plastic liner of the present invention is 3.8mm, which can be used after shaping;

The second step is to fix the plastic liner and hang glue on the surface.

Fix the plastic liner that has passed the blow molding test on the winding machine, and apply glue evenly on the surface of the plastic liner with a thickness of 0.06mm. The glue composition is: E128 epoxy resin 66.6%, E51 epoxy resin 21.4% , Carboxy-butadiene rubber (liquid) 2.2%, 650 polyamide 7.2%, tetramethylimidazole 2.6%;

The third step is to wind the bottom layer of carbon fiber and dry fiber on the surface of the plastic liner.

In order to verify that the winding line type can achieve the two conditions of uniform fiber distribution and stable winding, the present invention performs dry yarn winding on the pressure vessel by inputting the winding parameters determined during line type design. The dry fiber winding forming technology is based on the traditional winding technology. Improved. Traditional fiber-wound composite materials are composed of resin and fiber. The fiber is usually used to bear the tensile load along the fiber direction, and the resin is used to fix the fiber and bear and transmit the shear load, or interlayer stress; the winding equipment uses a seven-degree-of-freedom Robot winding workstation (six-axis robot + rotating spindle); the winding fiber uses T800 grade carbon fiber; input the geometric dimensions and winding parameters of the lining into the CNC system terminal. The geometric dimensions include pole hole and barrel diameter, head height, and barrel body length, select the geodesic winding method, input the winding angle as 12°, the yarn width as 4.5mm, the number of tangent points as 9, and the winding tension as 30N; after clamping the lining, debug the winding machine, calibrate the origin coordinates of the robot workstation, and adjust the coordinates of the origin of the robot workstation according to the lining The position determines the initial position of the robot winding and other machine tool parameters. In order to improve the success rate of yarn winding during the winding process, first set the silk nozzle to move back and forth without threading yarn, adjust the movement trajectory of the silk nozzle, and check the winding of the silk nozzle. Is the distance between the starting point and the static coordinate origin of the machine tool appropriate? If the nozzle trajectory deviates greatly from the ideal effect, adjust the coordinates of the winding starting point and the length of the hanging yarn to make the nozzle motion trajectory close to the ideal position. After 18 complete cycles, The fibers are evenly covered on the surface of the lining. In the case of continuous yarn, the above winding parameters are used to continue to complete the winding of the second spiral layer to verify the stability of the winding between fiber layers. During the winding process, the relationship between the fiber and the lining and the fiber and the fiber is There is no obvious slip phenomenon between the fibers. After the winding is completed, the fiber position is stable and evenly covered with the lining, which proves the feasibility of the dry yarn winding cylinder design scheme of the present invention; the spiral winding is a 9 tangent point line type, and the fibers are controlled at the silk nozzle After 9 round trips, the fibers were staggered by one yarn width. After 126 round trips, the fibers were evenly covered in the lining, and the fiber layer filling period was short during the winding process;

Step 4: Apply surface protective layer

After the winding of the dry yarn is completed, the surface layer is coated with a silicone rubber solution. The composition of the silicone rubber solution is: silicone rubber: butyl acetate = 28:72. After the solvent evaporates, a 3.0mm thick elastic protective layer is formed on the surface to obtain a complete Composite hydrogen storage bottle.

The 150L plastic inner full-wound gas cylinder manufactured by the present invention was tested after 24 hours of surface drying. The three pressure test burst detection values were 43.86MPa. The 24h pressure holding value was 43.81MPa, 42.59MPa and the 24h pressure holding value were 42.52MPa and 43.17 The pressure value of MPa pressure holding for 24 hours is 42.86MPa, which can ensure safe use under 35MPa.

The above specific description further explains the purpose, technical solutions and beneficial effects of the invention in detail. It should be understood that the above are only specific embodiments of the invention and are not intended to limit the protection of the invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (4)

1. A method for preparing a fully composite hydrogen storage bottle with a plastic liner and carbon fiber winding for vehicles, which is characterized by: including the following steps: The first step is to embed structural parts and blow molding - prepare the plastic liner 30CrMnSi is used to prepare the embedded structural parts. The thread of the threaded interface is M20X1.5mm-M40x2.5mm. The outer surface is knurled. The length of the embedded structural parts is 80mm-120mm. The length of the threaded part is 20mm-40mm, and the non-threaded part is flanged. Plum blossom shape, standby; connect the blow molding mechanism to the discharge port of the twin-screw machine, set the temperature control range of the twin-screw machine according to Table 1, add blow molded plastic to the feeding port of the twin-screw machine, and heat it to the predetermined temperature , the blow molding pressure condition is: Main oil pump pressure (P1): 9-18MPa Clamping pressure (P2): 12-19MPa Servo pump pressure (P3): 9-18MPa Pneumatic system pressure (P4): 0.5-0.9MPa Low pressure blowing pressure (P5): 0.15-0.55MPa High pressure blowing pressure (P6): 0.5-1.6MPa Table 1 Temperature control of deflector molding during blow molding of liner (unit: °C) The second step is to hang glue on the surface of the plastic liner. Fix the blow molded plastic liner that has passed the inspection on the winding machine, and evenly apply 0.06-0.15mm thick glue on the surface of the plastic liner. The glue composition is: E128 epoxy resin 55-62%, E51 epoxy resin 25-32%, carboxy-nitrile rubber or carboxy-nitrile rubber liquid 2-8%, 650 polyamide 6-12%, tetramethylimidazole 0.5-6%; The third step is to wind the bottom layer of carbon fiber and dry fiber on the surface of the plastic liner. The geodesic path is the shortest path between two points on the winding surface. In the reinforced structure, the geodesic is used to ensure the effective use of reinforcing fibers; the isotension model is used to convert the internal stress generated into the entire winding surface in the fiber direction. The constant stress of the cloth; the fibers on the winding surface only bear tensile strength, and the product will not be deformed due to the influence of internal pressure. The fiber direction is optimized through the combination of geodesic path and equal tension winding; sinα ₀ = r0 /R (1) Unfold the fibers wrapped around the barrel section, and use the pitch method to obtain the center angle equation of the barrel section of the pressure vessel: γ = Ltanα ₀ / πD × 360° (2) Cut any axial section of the barrel section and substitute equation (2) into the trajectory point equation of any point of the winding fiber in the barrel section, that is, the fiber trajectory equation of the head section; Take a meridian r=r(z) at the head and rotate it 360° along the z-axis to obtain the head rotation surface. The surface rotation equation is: r(θ, z) = (rcosθ, rsinθ, z); extract a curve on the surface C, and extract a point P on the curve C to study its geodesic curvature and normal curvature; During the winding and forming process, the yarn starts from one end of the pole hole, goes through a complete cycle and returns to a distance of one yarn width from the starting point, and then goes through several complete cycles to fill the lining; Fiber-reinforced plastics consist of a plastic lining and reinforcements that allow for flexibility through a high strength ratio; The pre-embedded implanted metal parts are blow-molded into a plastic liner. The plastic is used as the lining and then the high-performance carbon fiber is compositely molded with a resin matrix. The lining is made of polymer materials with anti-seepage and sealing functions. The fibers are not impregnated with resin. Under certain conditions, the pressure vessel is wound on the inner liner in a geodesic manner and the outer layer is coated with a silicone rubber or fluororubber protective layer. The dry yarn is wound around the pressure vessel and there is no subsequent curing process to achieve high molding efficiency and long service life. Recyclable features; The fourth step is to apply a surface protective layer After the dry yarn winding is completed, the surface is coated with silicone rubber or fluororubber solution to form an elastic protective layer with a thickness of 2-6mm on the surface, thereby obtaining a fully composite hydrogen storage bottle. 2. A method for preparing a fully composite hydrogen storage bottle with a plastic liner and carbon fiber winding for vehicles as claimed in claim 1, characterized in that: the blow molding material is a mixture of nylon 66, high-density polyethylene and low-density polyethylene; One kind of polypropylene; structural embedded parts are made of metal cylinder mouth threaded structural parts, and the non-threaded parts are embedded in the embedded corners of the blow molding layer. 3. A method for preparing a fully composite hydrogen storage bottle with a plastic liner and carbon fiber winding for vehicles as claimed in claim 2, characterized in that: high strength and stiffness are provided through reinforcing materials, while the plastic itself is relatively poor in strength and stiffness. , therefore the production process requires high strength. By designing the optimal model shape and fiber winding trajectory path, the fiber only bears tensile stress and the fiber plays 100% role. Under the shape, the fiber structure bears all the force; therefore, the plastic lining It does not bear absolute pressure and acts as a seal when it is under pressure. 4. A method for preparing a fully composite hydrogen storage bottle with a plastic liner and carbon fiber winding for vehicles as claimed in claim 1, 2 or 3, characterized in that: MATLAB software is used to simulate the trajectory of dry yarn winding; first, according to the shape of the mold For geometric dimensions, enter the geometric parameters of the head and barrel parts in the command box of MATLAB, then establish the geometric model of the lining through code programming, and establish the geometric model of the winding trajectory from the fiber trajectory equation; and in the center of the head section The rotation angle is a second-order differential equation, which is solved by the fourth-order Runge-Kutta method. Here, the ode45 function that comes with MATLAB is used to solve it. According to the required trajectory equation and winding parameters, the dry yarn winding line pattern is drawn in one cycle and five cycles. Line diagram with loops and full fibers.