Fuel tank with pre-embedded accessories and process for manufacturing a fuel tank

Abstract

The application discloses a fuel tank with a pre-embedded accessory and a process manufacturing method of the fuel tank. The pre-embedded accessory comprises a joint body and a disc-shaped part formed at the tail of the joint body. An attachment part is formed on the back disc surface of the disc-shaped part. The attachment part gradually expands in the axial direction towards the back disc surface, so that a first embedding area for embedding a thermoplastic material is defined between the attachment part and the back disc surface. After the thermoplastic material is embedded and cooled, the pre-embedded accessory is combined with the fuel tank body. By constructing the attachment part on the disc-shaped part of the pre-embedded accessory, the pre-embedded accessory is combined with the fuel tank body outside the fuel tank body.

Description

Technical Field

[0001] This invention relates to the field of fuel tank manufacturing technology, and in particular to a fuel tank and a method for manufacturing the fuel tank. Background Technology

[0002] Traditional fuel tanks are manufactured by stamping metal sheets, which results in excessive weight and high manufacturing costs.

[0003] Currently, fuel tanks with low strength requirements are manufactured using non-metallic plastic materials, such as plastic materials. There are two molding processes available in the existing technology.

[0004] Injection molding process: A mold is used to define the cavity for forming the walls of the fuel tank. Liquid thermoplastic material is injected into the cavity, and after the material cools, two fuel tank halves are formed. Then, a hot-melt process is used to fuse the two halves together. The disadvantages of this molding process are: the resulting fuel tank walls are relatively thick, have lower strength, and are prone to shrinkage cavities and other defects, which can render the fuel tank unusable. The advantages of this molding process are: it facilitates the integration of pre-embedded accessories, such as metal connectors, with the fuel tank body. For example, during injection molding, parts of the pre-embedded accessory structure can be bonded to the liquid thermoplastic material.

[0005] Blow molding process: Two plate-shaped thermoplastic parts are clamped between two molds that form a cavity conforming to the shape of the fuel tank. Air is then blown between the two thermoplastic parts using a blown needle, forcing them to deform and expand. The gas then presses the parts against the inner wall of the mold, thus shaping the fuel tank. Fuel tanks manufactured using this process have thinner walls, higher strength, and do not exhibit defects such as shrinkage porosity or shrinkage holes. The disadvantage of this process is that it is not easy to integrate pre-embedded accessories with the fuel tank.

[0006] When manufacturing fuel tanks using blown film technology, the existing technology typically integrates pre-embedded accessories with the fuel tank in the following manner:

[0007] Air is blown between two plate-shaped thermoplastic parts using a blown needle, causing the parts to deform initially. This creates a space between the parts. The molds are then opened, and the embedded accessory to be joined is placed within this space, with its head passing through the thermoplastic part. The molds are then closed again, and air is blown between the parts a second time, ultimately forming the fuel tank. During this process, the embedded accessory joins with the fuel tank, with its joint forming on the outside of the tank. As can be seen, to achieve this joining, the molds need to be opened during the blown film process, and the embedded accessory needs to be placed between the two thermoplastic parts, passing through them. Therefore, this joining method suffers from a complex manufacturing process, a tendency for air leakage between the accessory and the thermoplastic parts during the second air blowing process, and inaccurate positioning of the embedded accessory. Summary of the Invention

[0008] In view of the above-mentioned technical problems existing in the prior art, the embodiments of the present invention provide a fuel tank and a method for manufacturing the fuel tank.

[0009] To solve the above-mentioned technical problems, the technical solution adopted in the embodiments of the present invention is as follows:

[0010] A fuel tank with pre-embedded accessories includes:

[0011] The fuel tank body is formed by two plate-shaped thermoplastic parts that expand and deform by blowing air;

[0012] An embedded accessory includes a connector body and a disc-shaped portion formed at the tail of the connector body. An attachment portion is formed on the rear surface of the disc-shaped portion, and the attachment portion gradually extends in the axial direction facing the rear disc surface, thereby defining a first embedding area between the attachment portion and the rear disc surface; wherein:

[0013] The embedded accessory is located at a predetermined position on the outside of one of the thermoplastic components;

[0014] During the expansion of the thermoplastic component, the thermoplastic material on the outside of the thermoplastic component is embedded into the first embedding area, so that the pre-embedded accessory is combined with the fuel tank body on the outside of the fuel tank body.

[0015] Preferably, the attachment portion includes a plurality of conical columns arranged circumferentially around the center of the disc-shaped portion.

[0016] Preferably, the attachment portion includes an annular rib with the center of the disc-shaped portion as a circle, and the cross-section of the annular rib is dovetail-shaped.

[0017] This invention also discloses a manufacturing method for a fuel tank.

[0018] The fuel tank includes: a fuel tank body and a pre-embedded accessory. The pre-embedded accessory includes a connector body and a disc-shaped portion formed at the tail of the connector body. An attachment portion is formed on the rear disc surface of the disc-shaped portion. The attachment portion gradually expands in the axial direction facing the rear disc surface, so that a first embedding area is defined between the attachment portion and the rear disc surface. The inner hole of the connector body has an expansion portion.

[0019] The manufacturing method of the fuel tank includes:

[0020] S10: Keep both molds in the open state, insert the pre-embedded accessory into the body of one of the molds, with the rear disc surface of the disc-shaped part of the pre-embedded accessory facing the cavity formed by the two molds fastening together;

[0021] S20: Preheat the embedded accessories and their surrounding area;

[0022] S30: Close the two molds together, so that the edges of the two thermoplastic parts are held between the two molds;

[0023] S40: The top post extends from outside the mold through the guide hole into the inner hole of the pre-embedded accessory, and the head of the top post extends into the expansion part;

[0024] S50: Air is blown between two thermoplastic parts using a blower needle to cause the two thermoplastic parts to expand and eventually squeeze the inner wall of the mold; during the expansion process, the thermoplastic material of the area corresponding to the thermoplastic part and the embedded attachment melts and enters the first embedded area; the thermoplastic material of the area corresponding to the inner hole of the thermoplastic part and the embedded attachment expands into the inner hole of the embedded attachment to expand to the head of the top post to form an inner expansion part;

[0025] S60: Cooling the mold to cool the expanded thermoplastic part;

[0026] S70: The top post is removed from the guide hole, and a tubular cutter is inserted into the guide hole to cut the inner expansion part located in the expansion part, while retaining the flange that is attached to the stepped surface of the expansion part by expansion.

[0027] S80: Open the two molds so that the tank body and embedded accessories obtained by blown film can be removed from the molds.

[0028] S90: Screw the clamping sleeve and sealing gasket into the expansion section of the pre-embedded accessory, so that the head of the clamping sleeve is squeezed and turned over by the sealing gasket.

[0029] Preferably, the edge of the disc-shaped portion forms a concave annular curved surface; wherein:

[0030] The disc-shaped part of the pre-embedded accessory protrudes from the inner wall of the mold so that the annular curved surface and the inner wall of the mold form a second embedding area.

[0031] During the expansion of the two thermoplastic components, the thermoplastic material in the region corresponding to the edge of the thermoplastic component and the disc-shaped portion melts and enters the second embedded region.

[0032] Compared with the prior art, the beneficial effects of the fuel tank with pre-embedded accessories and the manufacturing method of the fuel tank disclosed in this invention are:

[0033] 1. By constructing an attachment part on the disc-shaped part of the pre-embedded accessory, the pre-embedded accessory can be combined with the fuel tank body on the outside of the fuel tank body.

[0034] 2. The method provided by this invention can prevent the mold from opening during the blown film process.

[0035] 3. The pre-embedded accessories are positioned on the mold during the blown film process, so the positioning of the pre-embedded accessories and the oil tank body is accurate after they are combined.

[0036] The overview of various implementations or examples of the technology described in this invention is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description

[0037] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the invention. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0038] Figure 1 A front sectional view of a fuel tank provided for an embodiment of the present invention.

[0039] Figure 2 for Figure 1 A magnified view of part A.

[0040] Figure 3 This is a front sectional view of the embedded attachment provided for an embodiment of the present invention.

[0041] Figure 4 A left-side view of a pre-embedded attachment provided for an embodiment of the present invention (showing an attachment portion of a structure).

[0042] Figure 5A left-side view of the embedded attachment provided for an embodiment of the present invention (showing an attachment with an alternative structure).

[0043] Figure 6 This is a view of the two molds before they are snapped together.

[0044] Figure 7 This is a view of the state after the two molds are closed.

[0045] Figure 8 This is a view of the two thermoplastic parts after blown film forming.

[0046] Figure 9 for Figure 8 A magnified view of part B (the inner bulge has not yet been cut by the cutter).

[0047] Figure 10 for Figure 8 A magnified view of part B (the inner bulge has been cut by a cutter).

[0048] Figure 11 A flowchart illustrating the manufacturing process of a fuel tank according to an embodiment of the present invention.

[0049] Figure label:

[0050] 10-Tank body; 11-First thermoplastic component; 111-Thickened part; 112-Flanged edge; 12-Second thermoplastic component; 20-Embedded accessory; 21-Disc-shaped part; 211-Attachment part; 2111-Conical column; 2112-Annular rib; 212-Annular curved surface; 213-Rear disc surface; 22-Joint body; 221-Inner hole; 222-Expansion part; 223-Stepped surface; 23-Pressure sleeve; 24-Sealing gasket; 101-First mold; 102-Second mold; 103-Cavity; 104-Blow needle; 105-Heater; 106-Top column; 107-Cutter. Detailed Implementation

[0051] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0052] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0053] like Figures 1 to 11 As shown, this invention discloses a fuel tank and a method for manufacturing the fuel tank, as follows: Figures 1 to 5 As shown, the fuel tank includes a fuel tank body 10 and a pre-embedded accessory 20 that is attached to the outside of the fuel tank body 10.

[0054] like Figure 11 As shown, the manufacturing process of the fuel tank includes:

[0055] S10: As Figure 6 As shown, the two molds are kept in the open state, and the pre-embedded accessory 20 is installed into the body of one of the molds. The rear disc surface 213 of the disc-shaped part 21 of the pre-embedded accessory 20 faces the cavity 103 formed by the two molds being fastened together.

[0056] Specifically, the two molds include a first mold 101 and a second mold 102. The inner sides of both the first mold 101 and the second mold form concave areas, and the first mold 101 and the second mold 102 are engaged to form a cavity 103.

[0057] The embedded accessory 20 is formed from metal material by stamping, casting or machining. The embedded accessory 20 is used to combine with the fuel tank body 10. When the fuel tank is manufactured and used, the embedded accessory 20 can be used as the fuel tank inlet, outlet or inspection port.

[0058] The pre-embedded accessory 20 includes a connector body 22 and a disc-shaped portion 21 formed at the tail of the connector body. An attachment portion 211 is machined on the rear disc surface 213 of the disc-shaped portion 21. The attachment portion 211 is configured to gradually extend in the axial direction in which the rear disc surface 213 is oriented.

[0059] This invention provides two types of attachment portions 211:

[0060] The first structure, such as Figure 3 and Figure 4 As shown, the attachment portion 211 is a conical column 2111, and the cross-section of the conical column 2111 is smaller as it gets closer to the rear disk surface 213. The attachment portion 211 includes a plurality of such conical columns 2111, which are evenly distributed circumferentially around the disk-shaped portion 21.

[0061] The second structure, such as Figure 3 and Figure 5 As shown, the attachment portion 211 is an annular rib 2112, with the center of the disc-shaped portion 21 as the center, and the cross-section of the annular rib 2112 is swallowtail-shaped.

[0062] like Figure 3 As shown, an annular curved surface 212 is also formed at the edge of the disc-shaped portion 21.

[0063] like Figure 8 and Figure 9 As shown, the connector body 22 has a circumferentially through inner hole 221, which serves as a fuel inlet or inspection port when in use with a fuel tank. The inner hole 221 has an expansion portion 222, and the end of the expansion portion 222 has a stepped surface 223 near the rear disc surface 213.

[0064] The accessory component is inserted into the pre-set countersunk hole of the first mold 101 from the inside, so that the rear disc surface 213 of the disc-shaped part 21 of the embedded accessory 20 faces the cavity 103, and the disc-shaped part 21 protrudes slightly from the inner wall of the first mold 101.

[0065] As can be seen from the above, the attachment portion 211 and the rear disc surface 213 of the disc-shaped portion 21 define the first embedding area, and the annular curved surface 212 at the edge of the disc-shaped portion 21 and the inner wall of the first mold 101 define the second embedding area.

[0066] S20: Preheat the embedded accessory 20 and its surrounding area.

[0067] Specifically, a heater 105 is installed around the embedded attachment 20 in the first mold 101. This heater is used to heat the embedded attachment 20 and its surrounding area so that the thermoplastic material will generate a certain amount of heat when it comes into contact with the embedded attachment 20, especially with the disc-shaped portion 21 of the attachment component.

[0068] S30: As Figure 7 As shown, the two molds are closed, so that the edges of the two thermoplastic parts are held between the two molds.

[0069] Specifically, the thermoplastic component serves as the blank for manufacturing the fuel tank body 10. Two thermoplastic components are obtained by extruding and cutting thermoplastic material. The two thermoplastic components specifically include a first thermoplastic component 11 and a second thermoplastic component 12. The first thermoplastic component 11, after expansion and deformation, is used to connect with the aforementioned embedded accessory 20, such as... Figure 6 As shown, the area between the first thermoplastic component 11 and the second thermoplastic component 12 is such that: the first thermoplastic component 11 has an annular thickened portion 111, the function of which is that after the first thermoplastic component 11 expands, the thickened portion 111 corresponds to the attachment portion 211 of the embedded accessory 20 to provide sufficient thermoplastic material to increase the strength of the embedded accessory 20 and the fuel tank body 10 in the joint area.

[0070] After the first mold 101 and the second mold 102 are closed, the first thermoplastic component 11 faces the concave area of ​​the first mold 101, and the second thermoplastic component 12 faces the concave area of ​​the second mold 102.

[0071] S40: The ejector pin 106 extends from outside the mold through the guide hole into the inner hole 221 of the embedded accessory 20, and the head of the ejector pin 106 extends into the expansion part 222.

[0072] Specifically, the top post 106 can be driven by an actuation mechanism (e.g., a telescopic cylinder) so that the top post 106 extends through the guide hole of the first mold 101 into the expansion portion 222 of the inner hole 221 of the pre-embedded accessory 20, and is withdrawn from the guide hole of the first mold 101 by the actuation mechanism.

[0073] S50: such as Figure 8 As shown, air is blown between the two thermoplastic parts using a blow needle 104, causing the two thermoplastic parts to expand and eventually squeeze the inner wall of the mold. During the expansion process, the thermoplastic material of the thermoplastic parts corresponding to the area of ​​the embedded attachment 20 is melted and enters the first embedded area. The thermoplastic material of the thermoplastic parts corresponding to the area of ​​the inner hole 221 of the embedded attachment 20 expands into the inner hole 221 of the embedded attachment 20 to expand to the head of the top post 106 to form an inner expansion portion.

[0074] Specifically, after the first mold 101 and the second mold 102 are closed, an air inlet (not shown) is provided between the edges of the first thermoplastic component 11 and the second thermoplastic component 12. The blow needle 104 passes through the air inlet and extends between the first and second thermoplastic components. The blow needle 104 blows air between the two plastic components using high-pressure gas provided by a high-pressure air pump. The two plastic components expand under the action of the high-pressure gas and eventually adhere tightly to the inside of the two molds to form a shape consistent with the cavity 103, that is, to form the oil tank body 10.

[0075] like Figure 8 and Figure 9 As shown, during the expansion of the first plastic component and its attachment to the inside of the first mold 101, the heater 105 heats the area of ​​the first plastic component corresponding to the embedded attachment 20, and processes the plastic material in this area into a near-molten state (at this time, the pressure of the blown gas is appropriately reduced). Under the action of air pressure, the thermoplastic material corresponding to the additional part of the embedded attachment 20 flows and fills the first embedded area, and the plastic material corresponding to the edge of the disc-shaped part 21 flows and fills the second embedded area. This allows the embedded attachment 20 to be bonded to the outside of the tank body 10 after cooling.

[0076] like Figure 9 As shown, the thermoplastic material corresponding to the inner hole 221 of the pre-embedded accessory 20 is also heated, and thus, it also enters the inner hole 221 through plastic deformation expansion and expands to the section where the expansion part 222 is located to form an inner expansion part, which is finally stopped by the head of the top column 106. During the expansion process in this area, the thermoplastic material expands radially at the stepped surface 223 to form a flange 112 that is attached to the stepped surface 223.

[0077] S60: Cooling the mold to cool the expanded thermoplastic part.

[0078] S70: As Figure 10 As shown, the top post 106 is withdrawn from the guide hole, and a tubular cutter 107 is inserted into the guide hole. The cutter 107 cuts the inner expansion portion located in the expansion portion 222, retaining the flange 112 that is attached to the stepped surface 223 of the expansion portion 222 by expansion. This flange 112 allows the area to be combined with the pre-embedded accessory 20.

[0079] S80: Open the two molds so that the tank body 10 and the embedded accessories 20 obtained by blown film can be removed from the molds.

[0080] S90: Screw the clamping sleeve 23 and the sealing gasket 24 into the expansion portion 222 of the embedded accessory 20, so that the head of the clamping sleeve 23 presses the flange 112 through the sealing gasket 24. In this step, the clamping sleeve 23 is configured with the sealing ring so that the fuel tank body 10 is sealed with the embedded accessory 20 through the flange 112, thereby preventing fuel leakage in this area.

[0081] The advantages of the fuel tank manufacturing method disclosed in this invention are:

[0082] 1. By constructing an attachment portion 211 on the disc-shaped portion 21 of the pre-embedded attachment 20, the pre-embedded attachment 20 can be combined with the fuel tank body 10 on the outside of the fuel tank body 10.

[0083] 2. The method provided by this invention can prevent the mold from opening during the blown film process.

[0084] 3. The pre-embedded attachment 20 is positioned on the mold during the blown film process. Therefore, the pre-embedded attachment 20 and the oil tank body 10 are accurately positioned after being combined.

[0085] Furthermore, although exemplary embodiments have been described in this invention, their scope includes any and all embodiments based on the invention that have equivalent elements, modifications, omissions, combinations (e.g., schemes involving intersections of various embodiments), adaptations, or alterations. Elements in the claims will be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the implementation of this application, and such examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered illustrative only, and the true scope and spirit are indicated by the full scope of the following claims and their equivalents.

[0086] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments can be used by those skilled in the art when reading the above description. Furthermore, in the above detailed description, various features may be grouped together to simplify the invention. This should not be construed as an intention that a disclosed feature, which is not claimed, is necessary for any claim. Rather, the subject matter of the invention may be less than all the features of the particular disclosed embodiments. Thus, the following claims are incorporated herein by reference as examples or embodiments, wherein each claim is independently considered as a separate embodiment, and these embodiments are contemplated as being able to be combined with each other in various combinations or arrangements. The scope of the invention should be determined by reference to the appended claims and the full scope of their equivalents.

[0087] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A fuel tank with pre-embedded accessories, characterized in that, include: The fuel tank body is formed by two plate-shaped thermoplastic parts that expand and deform by blowing air; An embedded accessory includes a connector body and a disc-shaped portion formed at the tail of the connector body. An attachment portion is formed on the rear surface of the disc-shaped portion, gradually extending axially towards the rear disc surface to define a first embedding region between the attachment portion and the rear disc surface. An annular curved surface at the edge of the disc-shaped portion forms a second embedding region communicating with the first embedding region on the inner wall of one of the molds. The second embedding region is located at the end of the first embedding region away from the concave region of one of the molds. Wherein: The embedded accessory is located at a predetermined position on the outside of one of the thermoplastic components; The connector body has an axially penetrating inner hole that communicates with the first embedded area. The inner hole is formed with an expansion portion. One end of the expansion portion away from the concave area of ​​one of the molds has a stepped surface close to the rear plate surface. During the expansion of the thermoplastic component, the thermoplastic material on the outside of the thermoplastic component is embedded into the first embedding area, so that the pre-embedded accessory is combined with the fuel tank body on the outside of the fuel tank body; the thermoplastic material corresponding to the edge of the disc-shaped portion is filled into the second embedding area by flow; the thermoplastic material in the area corresponding to the inner hole of the thermoplastic component expands towards the inner hole to expand to the head of the top post to form an inner bulge, and the thermoplastic material expands radially at the stepped surface to form a flange attached to the stepped surface; subsequently, the top post exits the guide hole communicating with the inner hole, and a tubular cutter is inserted into the guide hole, the cutter cutting the inner bulge while retaining the flange; The ejector pin can be driven by an actuation mechanism to extend into the expansion section through the guide hole of one of the molds, and to exit from the guide hole by the actuation mechanism.

2. The fuel tank with pre-embedded accessories according to claim 1, characterized in that, The attachment portion includes a plurality of conical columns, which are arranged circumferentially along the center of the disc-shaped portion.

3. The fuel tank with pre-embedded accessories according to claim 1, characterized in that, The attachment portion includes an annular rib with the center of the disc-shaped portion as a circle, and the cross-section of the annular rib is dovetail-shaped.

4. A method for manufacturing a fuel tank according to any one of claims 1-3, characterized in that, The fuel tank includes: a fuel tank body and a pre-embedded accessory. The pre-embedded accessory includes a connector body and a disc-shaped portion formed at the tail of the connector body. An attachment portion is formed on the rear disc surface of the disc-shaped portion. The attachment portion gradually expands in the axial direction facing the rear disc surface, so that a first embedding area is defined between the attachment portion and the rear disc surface. The inner hole of the connector body has an expansion portion. The manufacturing method of the fuel tank includes: S10: Keep both molds in the open state, insert the pre-embedded accessory into the body of one of the molds, with the rear disc surface of the disc-shaped part of the pre-embedded accessory facing the cavity formed by the two molds fastening together; S20: Preheat the embedded accessories and their surrounding area; S30: Close the two molds together, so that the edges of the two thermoplastic parts are held between the two molds; S40: The ejector pin extends from outside the mold through the guide hole into the inner hole of the embedded accessory, and the head of the ejector pin extends into the expansion part; S50: Air is blown between two thermoplastic parts using a blower needle to cause the two thermoplastic parts to expand and eventually squeeze the inner wall of the mold; during the expansion process, the thermoplastic material of the area corresponding to the thermoplastic part and the embedded attachment melts and enters the first embedded area; the thermoplastic material of the area corresponding to the inner hole of the thermoplastic part and the embedded attachment expands into the inner hole of the embedded attachment to expand to the head of the top post to form an inner expansion part; S60: Cooling the mold to cool the expanded thermoplastic part; S70: The top post is removed from the guide hole, and a tubular cutter is inserted into the guide hole to cut the inner expansion part located in the expansion part, while retaining the flange that is attached to the stepped surface of the expansion part by expansion. S80: Open the two molds so that the tank body and embedded accessories obtained by blown film can be removed from the mold; S90: Screw the clamping sleeve and sealing gasket into the expansion section of the pre-embedded accessory, so that the head of the clamping sleeve is squeezed and turned over by the sealing gasket.

5. The manufacturing method of the fuel tank according to claim 4, characterized in that, The edge of the disc-shaped portion forms a concave annular curved surface; wherein: The disc-shaped part of the pre-embedded accessory protrudes from the inner wall of the mold so that the annular curved surface and the inner wall of the mold form a second embedding area. During the expansion of the two thermoplastic components, the thermoplastic material in the region corresponding to the edge of the thermoplastic component and the disc-shaped portion melts and enters the second embedded region.

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