Sealing structure, sealing method and manufacturing method for self-plugging rivet

Abstract

The invention discloses a sealing structure for a self-plugging rivet, a sealing method and a manufacturing method of the sealing structure, the sealing structure comprises a sealing rubber cap, the sealing rubber cap is provided with an adhesion face used for being fixedly attached to the surface of a part to be riveted, and a containing cavity used for containing the self-plugging rivet is formed in the sealing rubber cap. Before the self-plugging rivet is installed, the sealing rubber cap is pre-fixed to the designated position of the part to be riveted through the pasting face of the sealing rubber cap. When the self-plugging rivet is riveted and formed, the pier head of the self-plugging rivet is directly formed in the containing cavity of the sealing rubber cap, so that the pier head is wrapped by a sealing medium which is arranged in the cavity in advance. The gluing operation which must be carried out at the pier head position which is difficult to approach after riveting in the traditional process is changed into the preset sealing which can be completed in the open space before riveting. And the problem that the subsequent gluing operation cannot be carried out or the quality is difficult to control due to the fact that the pier head is located in a closed space is fundamentally avoided.

Description

TECHNICAL FIELD

[0001] The application relates to a sealing structure, a sealing method and a manufacturing method of the sealing structure for a core-pulling rivet, and belongs to the technical field of riveting. BACKGROUND

[0002] In the production and manufacturing process of containers such as fuel tanks which have strict requirements on sealing, core-pulling rivets are often used to realize mechanical connection between tank body plates, accessories or reinforcing components. In order to ensure that the connection part has reliable air tightness and liquid tightness, prevent fuel leakage or external pollutants from entering, the current general process requires that after the core-pulling rivet completes the riveting operation, sealing treatment must be performed on the outer periphery of the dome head formed inside the workpiece, that is, a special sealing glue is used to fully cover and package the dome head and the surrounding joint.

[0003] However, this process faces significant technical bottlenecks in actual application. Because the structural design of the fuel tank often includes sandwiched layers, cavities or narrow inner recessed spaces, the dome head of the core-pulling rivet is often located inside these structures or close to the inner side wall plate, forming a closed or semi-closed operation space that is not visually visible and difficult for tools to enter. This leads to the following problems: first, the operator cannot directly and effectively observe and glue the dome head position after riveting; second, even with the help of auxiliary tools, it is difficult to ensure the uniformity, continuity and full coverage of the sealing glue, and quality defects such as missed coating, insufficient glue layer thickness or poor adhesion are prone to occur; third, this process has high dependence on operation skills and takes a long time, which seriously restricts assembly efficiency and process consistency.

[0004] In summary, how to reliably and efficiently seal the dome head in a closed space that is difficult to access after core-pulling riveting and easy to operate has become a technical problem to be solved in the field. The existing technology lacks an effective solution that can complete the sealing of this position simultaneously before or during riveting, which constitutes the technical starting point that the present application aims to improve. SUMMARY

[0005] In view of the deficiencies of the prior art, the sealing structure for a core-pulling rivet provided by the present application comprises a sealing glue cap, the sealing glue cap has a sticking surface for sticking and fixing with the surface of a piece to be riveted, and a containing cavity for containing the core-pulling rivet is arranged in the sealing glue cap.

[0006] In the above technical solution, further, the sealing glue cap comprises a main body part and a dovetail part, the longitudinal section of the main body part is isosceles trapezoidal, one end of the dovetail part is connected with the main body part, and the other end is provided with the sticking surface.

[0007] In any of the above technical solutions, the inner wall of the accommodating cavity is provided with a threaded structure; the sealing structure further includes a positioning bolt mechanism, which is adapted to and connected with the threaded structure to press and fix the sealing cap on the surface of the part to be riveted.

[0008] In the above technical solution, the positioning bolt mechanism further includes a nut and a bolt, and the bolt is provided with a limiting step; the nut and the sealing cap are respectively located on both sides of the part to be riveted, and the end of the bolt passes through the nut and the riveting hole on the part to be riveted in sequence, and then screws into the threaded structure in the accommodating cavity for fixation, and the limiting step abuts against the side of the nut facing away from the part to be riveted.

[0009] This application provides a sealing structure for blind rivets, which allows a sealing cap to be pre-fixed to a designated position on the part to be riveted, such as the inner wall of a fuel tank, via its adhesive surface before the blind rivet is installed. When the blind rivet is riveted, its head is formed directly within the receiving cavity of the sealing cap, and is thus enveloped by a sealing medium pre-placed within that cavity. This transforms the traditional process of applying adhesive to the inaccessible head after riveting into a pre-sealed operation that can be completed in an open space before riveting. It fundamentally avoids the problems of subsequent adhesive application being impossible or difficult to control in quality due to the head being in a confined space.

[0010] Furthermore, the sealing cap's accommodating cavity provides a customized space for the head of the pop rivet, whose shape and size can be optimized to ensure a full and tight fit with the cavity wall after the head deforms. Compared to traditional coating seals applied only to the head surface, this encapsulation seal has a larger contact area, better coverage, and can more effectively block leakage paths.

[0011] On the other hand, this application also provides a sealing method for blind riveting, applied to riveting and fixing a first part to be riveted and a second part to be riveted using blind rivets, wherein the first part to be riveted and the second part to be riveted have correspondingly aligned riveting holes; characterized in that the method includes:

[0012] The sealing cap is fixed to the inner surface of the first part to be riveted by its adhesive surface, and the opening of the accommodating cavity is aligned with the riveting hole on the first part to be riveted.

[0013] The pop rivet is passed sequentially through the rivet hole of the second part to be riveted and the rivet hole of the first part to be riveted, and then inserted into the receiving cavity of the sealing cap;

[0014] The pop rivets are riveted using a rivet gun to complete the riveting operation.

[0015] In the above technical solution, the step of "fixing the sealing cap to the inner surface of the first part to be riveted through its adhesive surface" specifically includes:

[0016] Clean the adhesive surface of the sealing cap and the mating area on the inner surface of the first riveted part that is opposite to the adhesive surface.

[0017] Apply sealant to at least one of the cleaned adhesive surface and the bonding area;

[0018] Align and press the adhesive surface of the sealing cap with the contact area on the inner surface of the first riveted part to achieve fixation.

[0019] In the above technical solution, further, after fixing the sealing cap to the inner surface of the first part to be riveted, and before performing the riveting operation, the method further includes:

[0020] An outer ring of sealant is applied to the contact periphery between the sealing cap and the inner surface of the first riveted part to form an outer seal.

[0021] In the above technical solution, after forming the outer seal, a step of curing the sealant is further included, the curing step including: standing at room temperature for a predetermined time, or standing under heating conditions for a predetermined time.

[0022] In the above technical solution, the step of "aligning and pressing the adhesive surface of the sealing cap with the contact area on the inner surface of the first riveted part" is specifically implemented through a positioning bolt mechanism, including:

[0023] Place the nut of the positioning bolt mechanism on the outer surface of the second part to be riveted and align it with the riveting hole on the second part to be riveted;

[0024] After the bolt of the positioning bolt mechanism passes through the nut, the riveting hole of the second riveted part, and the riveting hole of the first riveted part in sequence, it is screwed into the threaded structure in the accommodating cavity and fixed until the limiting step on the bolt abuts against the side of the nut facing away from the second riveted part, thereby pressing the sealing cap onto the inner surface of the first riveted part.

[0025] Before inserting the pop rivet into the receiving cavity, the method further includes removing the bolt and the nut.

[0026] The sealing method for core-pulling riveting provided in this application simplifies the process flow and improves assembly efficiency and quality stability. Specifically, traditional methods require two separate steps: riveting followed by the laborious process of sealing. This application integrates the sealing and riveting processes into a single step. Operators only need to attach the cap in an open space and then perform routine riveting to simultaneously achieve connection and sealing. This greatly simplifies the assembly process, reduces the demanding skill requirements for operators, and significantly improves production efficiency. Furthermore, since the sealing action is automatically completed by the cap's structure during the riveting process, it avoids problems such as omissions and uneven application that may occur with manual gluing, resulting in more stable and reliable product quality.

[0027] On the other hand, this application also provides a method for manufacturing the above-mentioned sealing structure, characterized in that it includes:

[0028] Position the cover plate above the base plate and align it with the base plate;

[0029] Insert the forming bolt from top to bottom through the through hole of the cover plate, and position the lower end of the forming bolt in the forming cavity of the base plate;

[0030] Place the pressure plate above the cover plate, and make the lower surface of the pressure plate abut against the top surface of the forming bolt;

[0031] The pressure plate, the cover plate, and the base plate are fixedly connected together by tension bolts to form a sealed casting mold;

[0032] The casting mold is flipped over, and sealant is injected into the molding cavity through the pouring hole provided on the bottom plate;

[0033] Allow the mold to stand after the adhesive is injected for curing treatment, and the curing time is the predetermined time.

[0034] Remove the tension bolt and the forming bolt in sequence, and take out the formed sealing cap from the mold.

[0035] This application also provides a manufacturing method for the aforementioned sealing structure, enabling one-time molding of complex sealing caps and ensuring product precision and consistency. The method utilizes a dedicated mold system consisting of a base plate, cover plate, pressure plate, and forming bolts to accurately reproduce key structural features of the sealing cap, such as the internal accommodating cavity and the external dovetail shape. In particular, the use of forming bolts to directly form the internal accommodating cavity and threaded structure of the cap achieves high-precision control of the cavity's size, shape, and position. In subsequent use of the sealing cap, the forming bolts can be used directly as positioning bolts, or bolts of the same specifications as the forming bolts can be used as positioning bolts.

[0036] Furthermore, the manufacturing method of the sealing structure provided in this application is highly versatile. By changing the forming bolts of different specifications and adjusting the cavity of the base plate, a series of sealing caps with different cavity diameters, depths, and even internal thread specifications can be produced under the same set of mold logic. Attached Figure Description

[0037] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0038] Figure 1 A three-dimensional structural schematic diagram of the sealing cap provided for an embodiment of this application;

[0039] Figure 2 A cross-sectional view of a sealing cap provided for an embodiment of this application;

[0040] Figure 3 Exploded view of a sealing structure for a blind rivet provided for an embodiment of this application;

[0041] Figure 4 A three-dimensional structural schematic diagram of a sealing structure for a blind rivet provided for an embodiment of this application;

[0042] Figure 5 A cross-sectional view of the working state of the sealing structure for the blind rivet provided in the embodiments of this application;

[0043] Figure 6 A schematic flowchart of a sealing method for core-pulling riveting provided for embodiments of this application;

[0044] Figure 7 A schematic diagram of the connection structure of the sealing structure, the first riveted part, and the second riveted part before the riveting operation;

[0045] Figure 8 This is a schematic diagram of the connection structure of the sealing structure, the first riveted part, and the second riveted part after the riveting operation.

[0046] Figure 9 Exploded view of the mold used in the manufacturing method of the sealing structure provided in the embodiments of this application;

[0047] Figure 10 A three-dimensional structural schematic diagram of the mold used in the manufacturing method of the sealing structure provided in the embodiments of this application in a first direction;

[0048] Figure 11 A three-dimensional structural diagram of the mold used in the manufacturing method of the sealing structure provided in the embodiments of this application in the second direction;

[0049] Figure 12A partial cross-sectional view of the mold used in the manufacturing method of the sealing structure provided in the embodiments of this application. Explanation of reference numerals in the attached figures

[0050] 100-Sealing cap; 110-Main body; 120-Dovetail; 130-Accommodating cavity; 131-Through hole; 132-Blind hole; 200-Positioning bolt mechanism; 210-Nut; 220-Bolt; 221-Limiting step; 300-Pull rivet; 10-First riveted part; 20-Second riveted part; 30-External seal; 40-Cover plate; 50-Base plate; 60-Forming bolt; 70-Pressure plate; 80-Tightening bolt; 51-Pouring hole. Detailed Implementation

[0051] To make the technical means, creative features, objectives and effects of this application easier to understand, the present invention will be further described below in conjunction with specific embodiments.

[0052] The embodiments based on the concepts of this disclosure can be modified in various ways and can take many forms. Therefore, specific embodiments will be illustrated by way of example in the accompanying drawings and described in detail in this specification or application. However, this is not intended to limit the embodiments based on the concepts of this disclosure to the specific forms disclosed, and should be understood to include all modifications, equivalents, and substitutions contained within the spirit and technology of this disclosure.

[0053] The terms "first" and / or "second" may be used to describe multiple constituent elements, but the constituent elements are not limited by the terms. The terms are used only to distinguish one constituent element from other constituent elements; for example, without exceeding the scope of the claims based on the concepts of this disclosure, a first constituent element may be named a second constituent element, and similarly, a second constituent element may be named a first constituent element.

[0054] When it is said that a constituent element is "connected" or "continued" to another constituent element, it should be understood that it can be directly connected to or continued to the other constituent element, or that there are other constituent elements in between. Conversely, when it is said that a constituent element is "directly connected" or "directly continued" to another constituent element, it should be understood that there are no other constituent elements in between. Other expressions used to describe the relationship between constituent elements, such as "between" or "directly between" or "adjacent to" or "directly adjacent to", should also be interpreted in the same way.

[0055] The terminology used in this specification is for illustrative purposes only and is not intended to limit the scope of this disclosure. Unless otherwise clearly stated in the text, singular expressions include plural expressions. In this specification, terms such as "comprising" or "having" specify the presence of predetermined features, numbers, steps, actions, constituent elements, components, or combinations thereof, and should be understood as not precluding the presence or additional possibilities of one or more other features or numbers, steps, actions, constituent elements, components, or combinations thereof.

[0056] Unless otherwise defined, all terms used herein, including technical or scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms that are identical to their definitions in commonly used dictionaries shall be interpreted in a meaning consistent with their literal meaning in the relevant art, and shall not be ideally or excessively interpreted in a formal sense unless explicitly defined in this specification.

[0057] In some riveting scenarios, such as a certain fuel tank product, after riveting with blind rivets, it is necessary to seal the rivet head with sealant. However, since the sealing location is inside the fuel tank, in a confined space, operators cannot directly and effectively observe the rivet head and apply sealant after riveting.

[0058] To address similar scenarios, a reliable, efficient, and easy-to-operate sealing treatment is required for the rivet head located in a hard-to-access enclosed space after riveting with a blind rivet. This application provides a sealing structure for blind rivets, including a sealing cap. The sealing cap has an adhesive surface for adhering and fixing to the surface of the part to be riveted, and the sealing cap has a receiving cavity for accommodating the blind rivet.

[0059] Before installing the blind rivets, the sealing cap can be pre-fixed to a designated position on the part to be riveted, such as the inner wall of a fuel tank, via its adhesive surface. When the blind rivet is riveted, its head forms directly within the receiving cavity of the sealing cap, and is thus enveloped by a sealing medium pre-placed within that cavity. This transforms the traditional process of applying adhesive to the inaccessible head after riveting into a pre-sealed operation that can be completed in an open space before riveting. This fundamentally avoids the problems of subsequent adhesive application being impossible or difficult to control in quality due to the head being in a confined space.

[0060] The above-mentioned design scheme of this application will be further described in detail below with reference to the accompanying drawings.

[0061] Figure 1 A three-dimensional structural schematic diagram of the sealing cap provided for an embodiment of this application; Figure 2 A cross-sectional view of a sealing cap provided for an embodiment of this application.

[0062] Please seeFigure 1 and Figure 2 This application provides a sealing structure for a blind rivet 300, including a sealing cap 100. The sealing cap 100 has a receiving cavity 130 for accommodating the blind rivet 300. The receiving cavity 130 includes a through hole 131 and a blind hole 132 communicating with the through hole 131. The cross-sections of the through hole 131 and the blind hole 132 are both circular, and the diameter of the through hole 131 is larger than the diameter of the blind hole 132.

[0063] The sealing cap 100 includes an integrally formed main body 110 and a dovetail 120. The longitudinal section of the main body 110 is an isosceles trapezoid. One end of the dovetail 120 is connected to the main body 110, and the other end is provided with an adhesive surface. The adhesive surface is used to attach and fix the sealing cap 100 to the surface of the part to be riveted.

[0064] The sealing structure for blind rivets provided in this application embodiment allows the sealing cap 100 to be pre-fixed to a designated position on the part to be riveted via its adhesive surface before the blind rivet 300 is installed. When the blind rivet 300 is riveted, its head is directly formed within the receiving cavity 130 of the sealing cap 100, and is thus enveloped by a sealing medium pre-placed within that cavity. This transforms the traditional process of applying adhesive to the inaccessible head after riveting into a pre-sealed operation that can be completed in an open space before riveting. It fundamentally avoids the problems of subsequent adhesive application being impossible or difficult to control in quality due to the head being in a confined space.

[0065] The dovetail portion 120 of the sealing cap 100 provides a larger adhesive surface area for a more secure fit and fixation to the part to be riveted. Of course, this is only one specific embodiment of this application, and the specific shape of the sealing cap 100 is not limited to this; it can also be any shape that satisfies the following conditions: it has an internal cavity 130 for accommodating the pop rivet 300, and an adhesive surface at its end.

[0066] Figure 3 Exploded view of a sealing structure for a blind rivet provided for an embodiment of this application; Figure 4 A three-dimensional structural schematic diagram of a sealing structure for a blind rivet provided for an embodiment of this application; Figure 5 A cross-sectional view of the working state of the sealing structure for the blind rivet provided in the embodiments of this application.

[0067] See Figures 3-5 In some embodiments of this application, the sealing structure for the blind rivet includes, for example: Figure 1 and Figure 2 The sealing cap 100 and the positioning bolt mechanism 200 are shown.

[0068] The inner wall of the receiving cavity 130 of the sealing cap 100 is provided with a threaded structure.

[0069] The positioning bolt mechanism 200 includes a nut 210 and a bolt 220. The bolt 220 is provided with a limiting step 221. The nut 210 and the sealing cap 100 are located on both sides of the part to be riveted. The end of the bolt 220 passes through the nut 210 and the riveting hole on the part to be riveted in sequence, and then engages with the threaded structure in the accommodating cavity 130 for fixation. The limiting step 221 abuts against the side of the nut 210 facing away from the part to be riveted, which can press and fix the sealing cap 100 on the surface of the part to be riveted.

[0070] The positioning bolt mechanism 200 mainly has the following dual functions:

[0071] On the one hand, during the process of applying sealant to the adhesive surface of the sealing cap 100 and fixing it to the designated position of the part to be riveted, the opening of the receiving cavity 130 of the sealing cap 100 is often difficult to align accurately with the riveting hole of the part to be riveted. By setting up a positioning bolt mechanism 200, preliminary positioning can be achieved first; before the sealant is cured and fixed, the position of the sealing cap 100 can be finely adjusted by using the cooperation of the bolt 220 with the riveting hole and the internal thread structure of the receiving cavity 130, so that the opening of the receiving cavity 130 is accurately aligned with the riveting hole of the part to be riveted;

[0072] On the other hand, after the bolt 220 passes through the nut 210, the riveting hole of the second riveted part 20, and the riveting hole of the first riveted part 10 in sequence, it is screwed into the threaded structure of the receiving cavity 130 for fixation. When the limiting step 221 on the bolt 220 abuts against the side of the nut 210 facing away from the second riveted part 20, the bolt 220 is tightened further, which can apply axial tension to the sealing cap 100, causing the adhesive surface of the sealing cap 100 to fit tightly against the surface of the riveted part, thereby effectively improving the overall sealing performance.

[0073] Figure 6 A schematic flowchart of a sealing method for core-pulling riveting provided for embodiments of this application.

[0074] See Figure 6 The embodiments of this application provide a sealing method for core-pulling riveting, specifically including the following steps:

[0075] S100: Surface pretreatment

[0076] The adhesive surface of the sealing cap 100 and the mating area on the inner surface of the first riveted part 10 opposite to the adhesive surface are respectively pretreated to remove impurities such as oil and dust that affect the bonding effect and to make the surface smooth.

[0077] In some embodiments, a green scouring pad is used to polish the adhesive surface of the cap and the mounting surface of the product, and a wiping cloth with acetone is used to remove excess material.

[0078] S200: Apply sealant

[0079] Apply sealant to at least one of the pre-treated adhesive surface and the bonding area.

[0080] In some embodiments, the sealant is HM109-modified. Mix the sealant thoroughly according to a mass ratio of A:B = 10:1, preparing 100g of sealant at a time. Apply the thoroughly mixed sealant to the adhesive surface of the sealant cap 100.

[0081] Of course, this is only one specific embodiment of this application. Alternatively, the sealant may not be applied to the adhesive surface of the sealing cap 100, but may be applied to the mating area of ​​the parts to be riveted; or the sealant may be applied to both the adhesive surface of the sealing cap 100 and the mating area of ​​the parts to be riveted.

[0082] S300: Preliminary alignment and pressing of sealing cap 100

[0083] Align the adhesive surface of the sealing cap 100 with the contact area on the inner surface of the first riveted part 10, and press them together to distribute the sealant evenly and remove air bubbles, thereby achieving the initial fixation of the sealing cap 100.

[0084] S400: Use the positioning bolt mechanism 200 to re-align and press the sealing cap 100.

[0085] The nut 210 of the positioning bolt mechanism 200 is placed on the outer surface of the second riveted part 20, i.e., the side facing away from the first riveted part 10, and the center hole of the nut 210 is aligned with the riveting hole on the second riveted part 20. With the cooperation of the bolt 220 with the riveting hole and the internal thread structure of the receiving cavity 130, the position of the sealing cap 100 can be finely adjusted, thereby ensuring that the opening of the receiving cavity 130 is precisely aligned with the riveting hole of the riveted part.

[0086] The bolt 220 of the positioning bolt mechanism 200 is passed sequentially through the nut 210, the riveting hole of the second riveted part 20, and the riveting hole of the first riveted part 10, and then screwed into the threaded structure in the receiving cavity 130 of the sealing cap 100 for fixation. The bolt 220 is continuously tightened until the limiting step 221 provided on the bolt 220 abuts against the side of the nut 210 facing away from the second riveted part 20. During this process, the bolt 220 generates a continuous axial tensile force on the sealing cap 100 through thread transmission, thereby pressing the sealing cap 100 evenly and tightly against the inner surface of the first riveted part 10.

[0087] S500: Coated outer ring sealant

[0088] At the contact perimeter formed after the adhesive surface of the sealing cap 100 is pressed against the inner surface of the first riveted part 10, an additional outer ring of sealant is applied to form a ring-shaped "outer seal 30". This outer ring sealant can effectively block any possible micro gaps or paths, significantly enhancing the sealing and protection capabilities of the joint edge.

[0089] S600: Sealant Curing

[0090] The sealant on the adhesive surface and the outer ring sealant are cured. The curing step can be achieved by allowing the mixture to stand at room temperature for a predetermined time, or by allowing it to stand under heating conditions for a predetermined time to accelerate the curing process.

[0091] In some embodiments, room temperature curing: temperature is 25±5℃, standing time is 12h; temperature rise curing: temperature is 70±2℃, standing time is 4h; the curing process is the vulcanization process.

[0092] S700: Remove positioning bolt mechanism 200

[0093] Once the sealant has reached its initial curing strength and can maintain the position of the sealant cap 100, or after final curing, unscrew the bolt 220 in the reverse direction and remove the nut 210, thereby dismantling the entire positioning bolt mechanism 200. After the mechanism is removed, the riveting hole on the first riveted part 10 is cleared, allowing for subsequent insertion of the pop rivet 300 and riveting operations.

[0094] S800: Insertion of the 300mm blind rivet

[0095] Figure 7 This is a schematic diagram of the connection structure of the sealing structure, the first riveted part 10, and the second riveted part 20 before the riveting operation. Figure 7 As shown,

[0096] The pop rivet 300 is passed through the riveting hole of the second riveted part 20 and the riveting hole of the first riveted part 10 in sequence, and then inserted into the receiving cavity 130 of the sealing cap 100.

[0097] S900: Riveting Operation

[0098] Figure 8 This is a schematic diagram showing the connection structure of the sealing structure, the first riveted part 10, and the second riveted part 20 after the riveting operation. Figure 8 As shown, a rivet gun is used to rivet the pop rivet 300 to complete the riveting and fixing.

[0099] Figure 9Exploded view of the mold used in the manufacturing method of the sealing structure provided in the embodiments of this application; Figure 10 A three-dimensional structural schematic diagram of the mold used in the manufacturing method of the sealing structure provided in the embodiments of this application in a first direction; Figure 11 A three-dimensional structural diagram of the mold used in the manufacturing method of the sealing structure provided in the embodiments of this application in the second direction; Figure 12 A partial cross-sectional view of the mold used in the manufacturing method of the sealing structure provided in the embodiments of this application.

[0100] See Figures 9 to 12 This application also provides a method for manufacturing the sealing structure as described above, the method comprising the following steps:

[0101] Step 1: Preliminary positioning and assembly of the mold. The cover plate 40 is accurately placed above the base plate 50, and the outer edges and internal features of the cover plate 40 and base plate 50 are fully aligned using positioning structures or visual alignment methods. This step ensures that the subsequently formed molding cavity has precise geometry and dimensions.

[0102] Step 2: Installation and positioning of forming bolt 60

[0103] The forming bolt 60 is inserted from top to bottom through the pre-drilled through hole 131 on the cover plate 40, so that the lower end of the forming bolt 60 is accurately inserted into the pre-machined forming cavity in the base plate 50. The forming bolt 60 is not only used to form the threaded structure inside the sealing cap 100 in the future, but also plays an auxiliary positioning role in this step to ensure the relative positional accuracy of the cover plate 40 and the base plate 50 in the vertical direction.

[0104] Step 3: Assembly and pre-tightening of pressure plate 70

[0105] Place the pressure plate 70 above the cover plate 40 and adjust its position so that the lower surface of the pressure plate 70 flatly abuts against the top of the forming bolt 60. The main function of the pressure plate 70 is to apply uniform pressure by tightening the bolt 80 in subsequent steps, ensuring that the entire mold remains structurally stable and well-sealed during the casting process.

[0106] Step 4: Final locking of the mold

[0107] Multiple sets of tension bolts 80 are used to firmly connect the pressure plate 70, cover plate 40, and base plate 50 into a whole, forming a closed casting mold system (such as...). Figure 10 (As shown). The tightening torque of the tension bolt 80 should be uniform to ensure a tight fit between the contact surfaces of the mold and prevent leakage of the sealant during the pouring process.

[0108] Step 5: Adjusting the posture of the mold

[0109] Rotate the locked casting mold 180° (e.g.) Figure 11 As shown, the pouring hole 51 of the base plate 50 faces upwards. This orientation facilitates subsequent pouring operations and helps to expel gas from the molding cavity, reducing the generation of bubble defects.

[0110] Step Six: Preparation and Pouring of Sealant

[0111] The prepared sealant (such as...) is injected into the molding cavity through the gating hole 51 on the base plate 50. Figure 12 As shown). Specifically:

[0112] Select HM109-modified two-component sealant and weigh it precisely according to the mass ratio of component A to component B of 10:1;

[0113] The recommended preparation amount is 100g each time to ensure uniform mixing and timely operation;

[0114] After the two components are thoroughly mixed, they are poured into a piping bag and slowly injected into the molding cavity through the conical pouring hole 51 of the base plate 50 by extrusion.

[0115] The pouring should be continuous until the conical pouring hole 51 is filled with sealant, indicating that the molding cavity has been completely filled.

[0116] Step 7: Curing treatment

[0117] The completed mold is then left to cure under controlled conditions. The curing process can be selected from any of the following options depending on production requirements:

[0118] Option A (Room Temperature Curing): Allow the sealant to cure naturally at an ambient temperature of 25±5℃ for 12 hours;

[0119] Option B (Heat Curing): Allow to stand at 70±2℃ for 4 hours to accelerate the curing process. The curing process is essentially the vulcanization and cross-linking process of the sealant, which gives the sealant cap 100 its final elasticity, sealing performance, and structural strength.

[0120] Step 8: Demolding and Removing the Finished Product

[0121] After the sealant has fully cured, remove all the tension bolts 80 in sequence, then carefully unscrew the forming bolts 60. Finally, separate the pressure plate 70, cover plate 40, and base plate 50, and remove the finished sealing cap 100 from the mold. The unscrewing process of the forming bolts 60 creates a precise threaded structure inside the sealing cap 100, which can reliably engage with the positioning bolts 220 or the pop rivets 300.

[0122] It should be noted that in the subsequent use of the sealing cap 100, the forming bolt 60 can be used directly as the positioning bolt 220, or a bolt 220 of the same specification as the forming bolt 60 can be used as the positioning bolt 220.

[0123] Furthermore, it should be understood that although this specification describes the embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole and the technical solutions in each embodiment.

Claims

1. A sealing structure for a blind rivet, characterized in that, The device includes a sealing cap having an adhesive surface for bonding and fixing to the surface of the part to be riveted, and the sealing cap having a receiving cavity for accommodating a pop rivet.

2. The sealing structure according to claim 1, characterized in that, The sealing cap includes a main body and a dovetail. The longitudinal section of the main body is an isosceles trapezoid. One end of the dovetail is connected to the main body, and the other end is provided with the adhesive surface.

3. The sealing structure according to claim 1 or 2, characterized in that, The inner wall of the accommodating cavity is provided with a threaded structure; the sealing structure also includes a positioning bolt mechanism, which is adapted to the threaded structure and is used to press and fix the sealing cap onto the surface of the part to be riveted.

4. The sealing structure according to claim 3, characterized in that, The positioning bolt mechanism includes a nut and a bolt, and the bolt is provided with a limiting step; the nut and the sealing cap are respectively located on both sides of the part to be riveted, and the end of the bolt passes through the nut and the riveting hole on the part to be riveted in sequence, and then screws into the threaded structure in the accommodating cavity for fixation, and the limiting step abuts against the side of the nut facing away from the part to be riveted.

5. A sealing method for blind riveting, applied to riveting and fixing a first part to be riveted and a second part to be riveted using blind rivets, wherein the first part to be riveted and the second part to be riveted have correspondingly aligned riveting holes; characterized in that, The method includes: The sealing cap as described in any one of claims 1 to 4 is fixed to the inner surface of the first part to be riveted by its adhesive surface, and the opening of the accommodating cavity is aligned with the riveting hole on the first part to be riveted. The pop rivet is passed sequentially through the rivet hole of the second part to be riveted and the rivet hole of the first part to be riveted, and then inserted into the receiving cavity of the sealing cap; The pop rivets are riveted using a rivet gun to complete the riveting operation.

6. The sealing method according to claim 5, characterized in that, The step of "fixing the sealing cap to the inner surface of the first part to be riveted via its adhesive surface" specifically includes: Clean the adhesive surface of the sealing cap and the mating area on the inner surface of the first riveted part that is opposite to the adhesive surface. Apply sealant to at least one of the cleaned adhesive surface and the bonding area; Align and press the adhesive surface of the sealing cap with the contact area on the inner surface of the first riveted part to achieve fixation.

7. The sealing method according to claim 6, characterized in that, After fixing the sealing cap to the inner surface of the first part to be riveted, and before performing the riveting operation, the method further includes: An outer ring of sealant is applied to the contact periphery between the sealing cap and the inner surface of the first riveted part to form an outer seal.

8. The sealing method according to claim 7, characterized in that, After the external seal is formed, the process also includes a step of curing the sealant, the curing step including: standing at room temperature for a predetermined time, or standing under heating conditions for a predetermined time.

9. The sealing method according to claim 6, characterized in that, The step of "aligning and pressing the adhesive surface of the sealing cap with the contact area on the inner surface of the first riveted part" is specifically implemented through a positioning bolt mechanism, including: Place the nut of the positioning bolt mechanism on the outer surface of the second part to be riveted and align it with the riveting hole on the second part to be riveted; After the bolt of the positioning bolt mechanism passes through the nut, the riveting hole of the second riveted part, and the riveting hole of the first riveted part in sequence, it is screwed into the threaded structure in the accommodating cavity and fixed until the limiting step on the bolt abuts against the side of the nut facing away from the second riveted part, thereby pressing the sealing cap onto the inner surface of the first riveted part. Before inserting the pop rivet into the receiving cavity, the method further includes removing the bolt and the nut.

10. A method for manufacturing a sealing structure as described in claims 1-4, characterized in that, include: Position the cover plate above the base plate and align it with the base plate; Insert the forming bolt from top to bottom through the through hole of the cover plate, and position the lower end of the forming bolt in the forming cavity of the base plate; Place the pressure plate above the cover plate, and make the lower surface of the pressure plate abut against the top surface of the forming bolt; The pressure plate, the cover plate, and the base plate are fixedly connected together by tension bolts to form a sealed casting mold; The casting mold is flipped over, and sealant is injected into the molding cavity through the pouring hole provided on the bottom plate; Allow the mold to stand after the adhesive is injected for curing treatment, and the curing time is the predetermined time. Remove the tension bolt and the forming bolt in sequence, and take out the formed sealing cap from the mold.

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