Forming method of bonding structure of multi-opening pressure vessel structural part and bonding structure

Abstract

The invention relates to the technical field of pressure vessel forming, in particular to a forming method of a bonding structure of a multi-opening pressure vessel structural part and the bonding structure. The method comprises the following steps that S1, rubber lining forming is conducted on the basis of a sand core mold, a rubber layer is formed, and the thickness of rubber ranges from 1 mm to 6 mm; s2, the surface of the rubber lining is coated with a transition layer, the transition layer is prepared from epoxy resin, an amine curing agent, liquid nitrile rubber and an accelerant, the mass ratio of the epoxy resin to the amine curing agent to the liquid nitrile rubber to the accelerant is 100: (10-20): (10-40): (1-5), and the thickness of the transition layer ranges from 0.1 mm to 0.5 mm; the elastic layer can be coated on the surface of the adhesive, the deformation of the metal material and the deformation of the rubber material are adjusted to be inconsistent under the action of internal high pressure under the condition that the bonding strength of the adhesive is not affected, and the water pressure bursting strength of the pressure vessel with the multiple openings in the side face is improved and can reach 40 MPa or above.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessel molding, and in particular to a molding method and a bonding structure of a multi-opening pressure vessel structural member. Background Art

[0002] Early pressure vessels mostly used ultra-high strength steel, which has the advantages of low cost, mature technology, and easy mass production. The main indicator for evaluating the performance of pressure vessels is the "vessel characteristic coefficient" (PV / W), where P is the burst pressure, V is the container volume, and W is the material mass. The characteristic coefficients of metal pressure vessels are very low. Ultra-high strength steel is usually 5km~8km, and titanium alloy is only 7km~11km, which is far from meeting the requirements of pressure vessels. Therefore, the composite material of pressure vessels is the general trend.

[0003] In order to improve the performance of pressure vessels, in addition to using high-performance, high-efficiency, and powerful advanced materials, it is also necessary to meet the structural characteristics of pressure vessel sealing and withstanding internal pressure. The structural design of high-pressure pressure vessels with side wall openings to install metal parts places stringent requirements on the process implementation of pressure vessel sealing and withstanding internal pressure.

[0004] At present, there is no method for sealing and bonding structural parts of composite pressure vessels with an outer diameter of Ф500mm-Ф650mm and a pressure of more than 40MPa after multiple openings. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the difficulty in sealing and bonding structural parts of composite pressure vessels with an outer diameter of Ф500mm-Ф650mm in the prior art after multiple openings at a pressure of more than 40MPa, thereby providing a molding method and bonding structure for the bonding structure of multi-opening pressure vessel structural parts.

[0006] In order to solve the above technical problems, the present invention provides a method for forming a bonding structure of a multi-opening pressure vessel structural member, comprising the following steps:

[0007] Step S1, forming a rubber lining on the basis of the sand core mold and forming a rubber layer with a rubber thickness of 1 mm to 6 mm;

[0008] Step S2, coating a transition layer on the surface of the rubber lining, the transition layer is made of epoxy resin, amine curing agent, liquid nitrile rubber, and accelerator, the mass ratio of epoxy resin: amine curing agent: liquid nitrile rubber: accelerator is 100: (10-20): (10-40): (1-5), the thickness of the transition layer is 0.1mm-0.5mm, and the transition layer not only has the function of an adhesive, but also contains liquid nitrile rubber to coordinate the deformation of the rigid composite material and the rubber layer;

[0009] Step S3, on the surface of the inner lining coated with the transition layer, dry winding, semi-dry winding, or wet winding process is used to perform circumferential and longitudinal alternating winding to form a composite material layer, wherein the composite material layer is a medium-high temperature resin; in the later stage, fiber fabrics are used to reinforce the strength of the opening parts where openings are required;

[0010] Step S4, co-curing the rubber layer, the transition layer and the composite material layer, wherein the curing system covers the curing of the rubber layer, the transition layer and the composite material layer, and the curing steps are 90° C., 120° C. and 150° C.;

[0011] Step S5, positioning the co-cured rubber layer, transition layer, and composite material layer through the tooling, and performing hole drilling after determining the drilling position and drilling size, the hole size is Ф30mm-Ф60mm, after the pressure vessel is drilled, the processing tooling and core mold tooling are removed, and the internal sand core mold is cleaned, and the pressure vessel after drilling is preliminarily completed;

[0012] Step S6, using 60-80 mesh sandpaper to roughen the surface of the rubber layer at the edge of the opening inside the pressure vessel, treating it with an organic solvent, and then applying a solvent-based adhesive. After the solvent evaporates, the thickness of the adhesive is 0.1 mm to 0.2 mm;

[0013] Step S7: The bonding parts of the metal parts to be bonded are treated by sandblasting, acid treatment or alkali treatment, and the treated metal parts are cleaned with an organic solvent:

[0014] Step S8, applying a solvent-based adhesive to the bonding part of the metal part, the thickness of the adhesive is 0.1mm-0.2mm after the solvent evaporates, applying an elastic layer of adhesive on the adhesive surface after the solvent evaporates, the thickness of the elastic layer after the solvent evaporates is 0.1mm-0.5mm; after the solvent evaporates, push the metal part coated with the elastic layer into the opening of the pressure vessel, and screw in the metal part clamping disk;

[0015] Step S9, the adhesive and the elastic layer are co-cured, the curing system cannot exceed the medium temperature curing of the rubber layer, the transition layer and the composite material layer, the curing steps are 60°C and 80°C, the curing time is 4-6 hours, and the pressure vessel is filled with an internal pressure of 0.3MPa-0.5MPa during the curing process;

[0016] Step S10: After the metal parts are bonded, a sealant is poured into the transition area between the metal parts and the rubber layer to coordinate the deformation of the metal parts and the rubber lining under high pressure.

[0017] Furthermore, in step S8, applying the elastic layer glue solution includes the following steps:

[0018] Step S801, preparation of elastic layer glue:

[0019] Roll out a (1.5±0.5) mm thick nitrile rubber raw sheet, cut it into (20±10) mm×(20±10) mm, prepare a glue solution according to the mass ratio of nitrile rubber: ethyl acetate of 100:(200-500), stir it evenly and then use it.

[0020] Further, in step S10,

[0021] Step S1001, take the pressure vessel out of the oven, hoist it onto the saddle, with the metal parts facing directly downward, clean the pressure vessel and the area around the metal parts with ethyl acetate, prepare a sealant solution according to the mass ratio of epoxy resin: DMP-30: polysulfide rubber: manganese dioxide of 10: (2-5): (10-20): (2-5), apply the prepared sealant solution evenly on the edge of the metal part twice with a brush, then slowly pour the remaining sealant solution around the metal part, put the pressure vessel in a curing oven and bake it at (80±10)°C for (40±10) min, or let it stand at room temperature for 12 hours to 36 hours, check the surface state of the sealant solution, and make sure it does not get on your hands.

[0022] Furthermore, the organic solvent is acetone or ethyl acetate solution.

[0023] The present invention also provides a bonding structure made by the molding method of the bonding structure of the multi-opening pressure vessel structural member, comprising: a pressure vessel, wherein the pressure vessel is provided with an opening; a metal part, wherein the metal part is inserted into the opening and abuts against the inner wall of the pressure vessel; and a connecting structure, which is arranged on the metal part.

[0024] Furthermore, the metal part includes a cylinder and a ring, the ring is sleeved on one end of the cylinder, and the cylinder is inserted into the opening, and the ring abuts against the inner wall of the pressure container.

[0025] Furthermore, the connection structure comprises an adhesive layer and an elastic layer, the adhesive layer is connected to the circular ring, and the elastic layer is arranged on the adhesive layer.

[0026] Furthermore, the metal part is made of steel alloy or aluminum alloy.

[0027] The technical solution of the present invention has the following advantages:

[0028] The method for forming a bonding structure of a multi-opening pressure vessel structural member provided by the present invention comprises the following steps: step S1, forming a rubber lining on the basis of a sand core mold, and forming a rubber layer, wherein the thickness of the rubber is 1 mm-6 mm; step S2, coating a transition layer on the surface of the rubber lining, wherein the transition layer is made of epoxy resin, amine curing agent, liquid nitrile rubber, and accelerator, wherein the mass ratio of epoxy resin: amine curing agent: liquid nitrile rubber: accelerator is 100: (10-20): (10-40): (1-5), and the thickness of the transition layer is 0.1 mm-0.5 mm. In addition to having the function of an adhesive, the transition layer also contains liquid nitrile rubber to coordinate the rigid composite material and the rubber layer. Deformation; Step S3, on the surface of the inner lining coated with the transition layer, dry winding, semi-dry winding, or wet winding process is used to perform circumferential and longitudinal alternating winding to form the composite material layer, and the composite material layer is a medium-high temperature resin; in the later stage, fiber fabrics are used to reinforce the strength of the opening parts where holes need to be opened; Step S4, co-curing the rubber layer, transition layer and composite material layer, the curing system covers the curing of the rubber layer, transition layer and composite material layer, and the curing steps are 90°C, 120°C, and 150°C; Step S5, the co-cured rubber layer, transition layer, and composite material layer are positioned by tooling, and the hole punching process is performed after the punching position and hole size are determined, and the hole size is Ф30 mm-Ф60mm, after the pressure vessel is opened, the processing tooling and core mold tooling are removed, and the internal sand core mold is cleaned, and the pressure vessel after the opening is initially completed; step S6, use 60-80 mesh sandpaper to roughen the surface of the rubber layer at the edge of the internal opening of the pressure vessel, treat it with an organic solvent, and then apply solvent-based adhesive. After the solvent evaporates, the thickness of the adhesive is 0.1mm-0.2mm; step S7, the bonding part of the metal parts to be bonded is treated by sandblasting, acid treatment or alkali treatment, and the treated metal parts are cleaned with organic solvents: step S8, the bonding part of the metal parts is coated with solvent-based adhesive. After the solvent evaporates, the thickness of the adhesive is 0.1mm-0. 2mm, apply elastic layer glue on the adhesive surface after the solvent evaporates, and the thickness of the elastic layer after the solvent evaporates is 0.1mm-0.5mm; after the solvent evaporates, push the metal part coated with the elastic layer into the opening of the pressure vessel and screw it into the metal part clamping disk; step S9, the adhesive and the elastic layer are co-cured, and the curing system cannot exceed the medium-temperature curing of the rubber layer, the transition layer and the composite material layer. The curing steps are 60℃ and 80℃, and the curing time is 4-6 hours. During the curing process, the pressure vessel is filled with an internal pressure of 0.3MPa-0.5MPa; step S10, after the metal parts are bonded, fill the sealant in the transition area between the metal parts and the rubber layer to coordinate the deformation of the metal parts and the rubber lining under high pressure.

[0029] The pressure vessel after molding of the present invention can adjust the deformation inconsistency between the metal material and the rubber material under the internal high pressure without affecting the bonding strength of the adhesive by applying an elastic layer on the surface of the adhesive, thereby improving the hydraulic bursting strength of the pressure vessel with multiple side openings, and the hydraulic bursting strength can reach more than 40MPa. Thus, the bonding and sealing problems of the structural parts of the resin-based composite pressure vessel with an outer diameter of 500mm-650mm can be solved.

[0030] At the same time, the curing steps of the metal parts bonding structure provided by the present invention are 60°C and 80°C, and the curing time is 4-6 hours, which has little effect on the interface bonding strength of the metal nozzle / rubber, metal nozzle / composite and rubber / composite of the pressure vessel after molding, and the performance of the pressure vessel itself will not be affected by the bonding of the metal parts. In addition, the present invention has a simple process, is easy to operate, and is suitable for large-scale process production.

[0031] This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A flow chart of a method for forming a bonding structure of a multi-opening pressure vessel structural member provided by the present invention;

[0034] Figure 2 A schematic diagram of the structure of a multi-opening pressure vessel structure provided by the present invention;

[0035] Figure 3 A schematic structural diagram of the bonding structure of a multi-opening pressure vessel structural member provided by the present invention.

[0036] Description of reference numerals:

[0037] 1. Rubber layer; 2. Composite material layer; 3. Pressure vessel; 31. Opening; 4. Adhesive layer; 5. Elastic layer; 6. Metal parts; 61. Cylinder; 62. Ring; 7. Sealant liquid. DETAILED DESCRIPTION

[0038] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0039] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply 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 disclosure. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0041] In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] The disclosure below provides many different embodiments or examples to realize different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0043] The preferred embodiments of the present disclosure are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0044] See also Figures 1 to 3As shown, the present invention provides a molding method for a bonding structure of a multi-opening pressure vessel structural member, comprising the following steps: step S1, molding a rubber lining on a sand core mold, and forming a rubber layer 1, wherein the rubber thickness is 1 mm-6 mm; step S2, coating a transition layer on the surface of the rubber lining, wherein the transition layer is made of epoxy resin, amine curing agent, liquid nitrile rubber, and accelerator, wherein the mass ratio of epoxy resin: amine curing agent: liquid nitrile rubber: accelerator is 100: (10-20): (10-40): (1-5), and the thickness of the transition layer is 0.1 mm-0.5 mm. In addition to having the function of an adhesive, the transition layer also contains liquid nitrile rubber to coordinate the deformation of the rigid composite material and the rubber layer 1; Step S3, on the surface of the inner lining coated with the transition layer, dry winding, semi-dry winding, or wet winding process is used to perform circumferential and longitudinal alternating winding to form the composite material layer 2, and the composite material layer 2 is a medium-high temperature resin; in the later stage, fiber fabrics are used to reinforce the strength of the opening parts where holes need to be opened; Step S4, the rubber layer 1, the transition layer and the composite material layer 2 are co-cured, and the curing system covers the curing of the rubber layer 1, the transition layer and the composite material layer 2, and the curing steps are 90°C, 120°C, and 150°C; Step S5, the co-cured rubber layer 1, the transition layer, and the composite material layer 2 are positioned by tooling, and the hole punching process is performed after the punching position and the punching size are determined, and the hole size is Ф30mm-Ф 60mm, after the pressure vessel 3 is opened, the processing tooling and the core mold tooling are removed, and the internal sand core mold is cleaned, and the pressure vessel 3 after the opening is initially completed; step S6, use 60-80 mesh sandpaper to roughen the surface of the rubber layer 1 at the edge of the internal opening of the pressure vessel 3, after cleaning with an organic solvent, apply a solvent-based adhesive, and the thickness of the adhesive is 0.1mm-0.2mm after the solvent evaporates; step S7, the bonding part of the metal part 6 to be bonded is treated by sandblasting, acid treatment or alkali treatment, and the treated metal part 6 is cleaned with an organic solvent: step S8, the bonding part of the metal part 6 is coated with a solvent-based adhesive, and the thickness of the adhesive is 0.1mm-0.2mm after the solvent evaporates, After the solvent evaporates, the adhesive surface is coated with the elastic layer 5 glue, and the thickness of the elastic layer 5 after the solvent evaporates is 0.1mm-0.5mm; after the solvent evaporates, the metal part 6 coated with the elastic layer 5 is pushed into the opening of the pressure vessel 3, and the metal part 6 clamping disk is screwed in; step S9, the adhesive and the elastic layer 5 are co-cured, and the curing system cannot exceed the medium-temperature curing of the rubber layer 1, the transition layer and the composite material layer 2. The curing steps are 60°C and 80°C, and the curing time is 4-6 hours. During the curing process, the pressure vessel 3 is filled with an internal pressure of 0.3MPa-0.5MPa; step S10, after the metal part 6 is bonded, a sealant is poured into the transition area between the metal part 6 and the rubber layer 1 to coordinate the deformation of the metal part 6 and the rubber lining under high pressure.

[0045] The pressure vessel 3 after molding of the present invention can adjust the deformation inconsistency between the metal material and the rubber material under the internal high pressure without affecting the bonding strength of the adhesive by applying the elastic layer 5 on the adhesive surface, thereby improving the hydraulic bursting strength of the pressure vessel 3 with multiple side openings, and the hydraulic bursting strength can reach more than 40MPa. Thus, the bonding and sealing problems of the structural parts of the resin-based composite pressure vessel 3 with an outer diameter of 500mm-650mm after the side openings are solved.

[0046] At the same time, the curing steps of the metal part 6 bonding structure provided by the present invention are 60°C and 80°C, and the curing time is 4-6 hours, which has little effect on the interface bonding strength of the metal nozzle / rubber, metal nozzle / composite and rubber / composite of the formed pressure vessel 3, and the performance of the pressure vessel 3 itself will not be affected by the bonding of the metal part 6. In addition, the process of the present invention is simple, easy to operate, and suitable for large-scale process production.

[0047] And, in step S8, applying the glue for the elastic layer 5 includes the following steps: step S801, preparation of the glue for the elastic layer 5: rolling a (1.5±0.5) mm thick nitrile rubber raw film, cutting it to (20±10) mm×(20±10) mm, preparing the glue according to the mass ratio of nitrile rubber: ethyl acetate of 100:(200-500), stirring it evenly and then using it.

[0048] Among them, in step S10, step S1001, take the pressure vessel 3 out of the furnace, hoist it onto the saddle, with the metal part 6 facing directly downward, clean the pressure vessel 3 and the area around the metal part 6 with ethyl acetate, prepare a sealant liquid 7 according to the mass ratio of epoxy resin: DMP-30: polysulfide rubber: manganese dioxide of 10: (2-5): (10-20): (2-5), apply the prepared sealant liquid 7 evenly on the edge of the metal part 6 twice with a brush, slowly pour the remaining sealant liquid around the metal part 6, put the pressure vessel 3 into a curing furnace and bake at (80±10)°C for (40±10) min, or let it stand at room temperature for 12 hours to 36 hours to check the surface state of the sealant liquid 7, and make sure it does not get on your hands.

[0049] In this embodiment, in step S1, a rubber lining is formed on the basis of a sand core mold, and the rubber inner layer comprises EPDM rubber and nitrile rubber.

[0050] In step S3, fiber fabrics are used to reinforce the strength of the openings at the later stage where openings are required; the fiber fabrics contain prepreg.

[0051] Specifically, the organic solvent is acetone or ethyl acetate solution.

[0052] The present invention also provides a bonding structure made by the molding method of the bonding structure of the multi-opening pressure vessel structural member, comprising: a pressure vessel 3, wherein the pressure vessel 3 is provided with an opening 31; a metal part 6, wherein the metal part 6 is inserted into the opening 31 and abuts against the inner wall of the pressure vessel 3; and a connecting structure is provided on the metal part 6.

[0053] When the pressure vessel 3 is manufactured, the pressure vessel 3 can be punched with a processing tool to form an opening 31 on the pressure vessel 3 , and then the metal part 6 can be inserted into the opening 31 of the pressure vessel 3 for bonding using a connecting structure.

[0054] The metal member 6 includes a cylinder 61 and a ring 62 . The ring 62 is sleeved on one end of the cylinder 61 . The cylinder 61 is inserted into the opening 31 . The ring 62 abuts against the inner wall of the pressure container 3 .

[0055] The connection structure includes an adhesive layer 4 and an elastic layer 5 . The adhesive layer 4 is connected to the circular ring 62 , and the elastic layer 5 is disposed on the adhesive layer 4 .

[0056] Specifically, the adhesive layer 4 is a binder.

[0057] The side of the ring 62 in contact with the pressure vessel 3 is the bonding surface, that is, the ring 62 and the pressure vessel 3 are both coated with adhesive, and the elastic layer 5 is coated between the two layers of adhesive. The side of the ring 62 away from the pressure vessel 3 is coated with adhesive and elastic layer 5, and the sealing glue 7 is coated on the elastic layer 5 for sealing.

[0058] In this embodiment, the metal member 6 is made of steel alloy or aluminum alloy.

[0059] The pressure vessel 3 is coated with an elastic layer 5 on the surface of the adhesive to adjust the deformation inconsistency between the metal material and the rubber material under the internal high pressure without affecting the bonding strength of the adhesive, thereby improving the water pressure bursting strength of the pressure vessel 3 with multiple side openings, and the water pressure bursting strength can reach more than 40MPa.

[0060] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A method for forming a bonding structure of a multi-opening pressure vessel structural member, characterized in that: The following steps are involved: Step S1, forming a rubber lining on the basis of a sand core mold, and forming a rubber layer (1), the thickness of the rubber being 1 mm to 6 mm; Step S2, coating a transition layer on the surface of the rubber lining, the transition layer is made of epoxy resin, amine curing agent, liquid nitrile rubber, and accelerator, the mass ratio of epoxy resin: amine curing agent: liquid nitrile rubber: accelerator is 100: (10-20): (10-40): (1-5), the thickness of the transition layer is 0.1 mm-0.5 mm, and the transition layer not only acts as an adhesive, but also contains liquid nitrile rubber to coordinate the deformation of the rigid composite material and the rubber layer (1); Step S3, using dry winding, semi-dry winding, or wet winding process to alternately wind in the circumferential direction and in the longitudinal direction on the surface of the inner lining coated with the transition layer to form the composite material layer (2), wherein the composite material layer (2) is a medium-high temperature resin; and using fiber fabric to reinforce the strength of the opening (31) at the position where the opening (31) is required in the later stage; Step S4, co-curing the rubber layer (1), the transition layer and the composite material layer (2), wherein the curing system covers the curing of the rubber layer (1), the transition layer and the composite material layer (2), and the curing steps are 90° C., 120° C. and 150° C.; Step S5, positioning the co-cured rubber layer (1), transition layer, and composite material layer (2) by means of a tool, and after determining the punching position and punching size, performing a hole (31) processing, wherein the hole (31) has a size of 30 mm to 60 mm. After the hole (31) of the pressure vessel (3) is opened, the processing tool and the core mold tool are removed, and the internal sand core mold is cleaned. The pressure vessel (3) after the hole (31) is opened is preliminarily completed; Step S6, using 60-80 mesh sandpaper to roughen the surface of the rubber layer (1) at the edge of the internal opening (31) of the pressure vessel (3), treating it with an organic solvent, and then applying a solvent-based adhesive. After the solvent evaporates, the thickness of the adhesive is 0.1 mm to 0.2 mm; Step S7, the bonding part of the metal piece (6) to be bonded is surface treated by sandblasting, acid treatment or alkali treatment, and the treated metal piece (6) is cleaned with an organic solvent: Step S8, coating the bonding part of the metal part (6) with a solvent-based adhesive, the thickness of which is 0.1 mm to 0.2 mm after the solvent evaporates, coating the elastic layer (5) adhesive on the adhesive surface after the solvent evaporates, the thickness of which is 0.1 mm to 0.5 mm after the solvent evaporates; after the solvent evaporates, pushing the metal part (6) coated with the elastic layer (5) into the opening (31) of the pressure vessel (3), and screwing the clamping disc of the metal part (6) into place; Step S9, the adhesive and the elastic layer (5) are co-cured, the curing system cannot exceed the medium temperature curing of the rubber layer (1), the transition layer and the composite material layer (2), the curing steps are 60° C. and 80° C., the curing time is 4-6 hours, and the pressure vessel (3) is filled with an internal pressure of 0.3MPa-0.5MPa during the curing process; Step S10: After the metal part (6) is bonded, a sealant is poured into the transition area between the metal part (6) and the rubber layer (1) to coordinate the deformation of the metal part (6) and the rubber lining under high pressure.

2. The method for forming a bonding structure of a multi-opening pressure vessel structural member according to claim 1, characterized in that: In step S8, applying the glue solution to the elastic layer (5) includes the following steps: Step S801, preparation of adhesive solution for elastic layer (5): Roll out a (1.5±0.5) mm thick nitrile rubber raw sheet, cut it into (20±10) mm×(20±10) mm, prepare a glue solution according to the mass ratio of nitrile rubber: ethyl acetate of 100:(200-500), stir it evenly and then use it.

3. The method for forming a bonding structure of a multi-opening pressure vessel structural member according to claim 2, characterized in that: In step S10, Step S1001, take the pressure vessel (3) out of the oven, hoist it onto the saddle, with the metal part (6) facing directly downward, clean the pressure vessel (3) and the area around the metal part (6) with ethyl acetate, prepare a sealant (7) according to the mass ratio of epoxy resin: DMP-30: polysulfide rubber: manganese dioxide of 10: (2-5): (10-20): (2-5), apply the prepared sealant (7) evenly on the edge of the metal part (6) twice with a brush, then slowly pour the remaining sealant around the metal part (6), place the pressure vessel (3) in a curing oven and bake at (80±10)°C for (40±10) min, or leave it at room temperature for 12 hours to 36 hours, check the surface state of the sealant (7), and make sure it is not stained.

4. The method for forming a bonding structure of a multi-opening pressure vessel structural member according to claim 3, characterized in that: The organic solvent is acetone or ethyl acetate solution.

5. A bonding structure made by the molding method of a bonding structure of a multi-opening pressure vessel structure according to any one of claims 1 to 4, characterized in that: include: A pressure container (3), wherein the pressure container (3) is provided with an opening (31); A metal part (6), the metal part (6) is inserted into the opening (31) and abuts against the inner wall of the pressure container (3); The connecting structure is arranged on the metal part (6).

6. The bonding structure according to claim 5, characterized in that: The metal part (6) comprises a cylinder (61) and a ring (62). The ring (62) is sleeved on one end of the cylinder (61). The cylinder (61) is inserted into the opening (31). The ring (62) abuts against the inner wall of the pressure container (3).

7. The bonding structure according to claim 6, characterized in that: The connection structure comprises an adhesive layer and an elastic layer (5); the adhesive layer (4) is connected to the circular ring (62), and the elastic layer (5) is arranged on the adhesive layer (4).

8. The bonding structure according to claim 7, characterized in that: The metal part (6) is made of steel alloy or aluminum alloy.

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