Sealing connection system between blocks of a composite forming assembly mold

Abstract

The application relates to a sealing connection system between split molds in a composite material forming combined mold, which comprises a lap plate, a sealing strip, a filling sealant, an end face connecting block and a sealing installation structure arranged on the split mold, the sealing installation structure comprises a lap avoiding groove, a sealing groove and an end face avoiding groove cavity, the sealing strip is installed in the sealing groove and extends out of the sealing groove at both ends, the lap plate is installed in the lap avoiding groove of two split molds at both sides and is fixedly connected with the two split molds, the lap plate is pressed on the upper end of the sealing strip and covers the butt joint, and the upper end face of the lap plate constitutes a mold surface; the end face connecting block is installed in the end face avoiding groove cavity and is fixedly connected with the split mold, a filling groove cavity is formed between the end face connecting block and the split mold, the lap avoiding groove port and the sealing groove port are located in the filling groove cavity, and the filling sealant fills the filling groove cavity.

Description

Technical Field

[0001] This invention relates to the field of mold sealing technology, and more specifically to a sealing connection system between segmented molds in a composite material molding assembly mold. Background Technology

[0002] Composite materials possess advantages such as high specific modulus and specific strength, corrosion resistance, high temperature resistance, fatigue resistance, strong designability, and good dimensional stability, leading to their widespread application in aerospace and other fields. The application of composite materials has expanded significantly from initial secondary load-bearing structures to primary load-bearing structures such as wings and fuselages, including aircraft fuselage panels and wing panels.

[0003] The manufacturing of composite material components requires high-precision molds to ensure the final product's dimensional and positional tolerances and other properties. After the prepreg is laid, a vacuum bag is created to cover the entire part for sealing, and then vacuum-pressed before being placed in an autoclave for curing. With advancements in composite material applications, parts are becoming increasingly larger, and single-piece molds are no longer sufficient to meet product molding requirements. This significantly reduces the manufacturability of designing single-piece integral molds, substantially increases manufacturing costs, and diminishes convenience during transportation and use. Furthermore, the structural shapes of increasingly complex composite material components are becoming more intricate, making single-piece molds insufficient for demolding requirements during manufacturing; therefore, modular molds must be used for product manufacturing.

[0004] A modular mold is designed by manufacturing several individual mold pieces separately, and then connecting and assembling these individual mold pieces into a complete mold through mechanical connections or other means, forming the complete shape of the product. See the appendix for the structure of the modular mold. Figure 1 As shown, the combined mold 1 is assembled from multiple segmented molds 11. A seal is required between the joints of two segmented molds 11. Existing sealing methods for the segmented molds 1 have the following problems: 1. Combined molds typically use sealing strips at the joint edges of two segmented molds, and apply pressure to the sealing strips using screws to ensure a seal. However, due to the large size of each segmented mold, the pressure applied by the screws is generally not very effective. 2. To improve the sealing effect, double-layer sealing strips are often used to seal the overlapping area of ​​the combined mold. Designing double-layer sealing strips increases the... When connecting with screws, the sealing strip near the screws tends to have a better pressure effect, while the sealing strip at the far end has a poorer pressure effect. In addition, due to structural limitations, many molds do not have enough space to arrange double sealing strips in the mating area. 3. At the edges of the mating seam, longitudinal sealing along the length direction is currently often achieved by introducing pressure plates with sealing blocks. This method increases the risk of sealing failure of the pressure plate itself. 4. During mold assembly, the sealing strip is prone to moving out of the sealing groove, resulting in unstable sealing effect and easy damage to the sealing strip, leading to rework of the sealing process. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by the present invention is to provide a sealing connection system between the segmented molds in a composite material molding assembly mold, which can realize the connection and sealing between the two segmented molds, has a good pressure effect on the sealing strip, can seal the end face of the sealing strip, has a stable and reliable sealing effect, and is easy to install.

[0006] To achieve the above objectives, the present invention provides a sealing connection system between segmented molds in a composite material molding assembly mold. The segmented molds are joined together via mating sides, forming a mating seam between the mating sides of two segmented molds. The sealing system includes an overlap plate, a sealing strip, a filling sealant, end face connecting blocks, and a sealing mounting structure disposed on the segmented molds. The sealing mounting structure includes an overlap clearance groove located at and extending along the mating side, a sealing groove located at the bottom surface of the overlap clearance groove, and end face clearance cavities located at both ends of the overlap clearance groove. The sealing strip is installed in the sealing groove, with both ends extending out of the sealing groove. The overlapping plate is installed on both sides in the overlapping clearance grooves of the two segmented molds and is fixedly connected to both segmented molds. The overlapping plate is pressed against the upper end of the sealing strip and covers the butt joint. The upper surface of the overlapping plate forms the mold profile. The end face connecting block is installed in the end face clearance groove cavity and is fixedly connected to the segmented mold. A filling groove cavity is formed between the end face connecting block and the segmented mold. The port of the overlapping clearance groove and the port of the sealing groove are both located in the filling groove cavity. The filling sealing colloid fills the filling groove cavity.

[0007] Furthermore, the length of the sealing strip extending from both ends of the sealing groove port is 20-30mm.

[0008] Furthermore, it also includes a main vacuum bag, a back vacuum bag, and an end face vacuum bag. The segmented mold has a back cavity located below the overlap avoidance groove. The back vacuum bag is installed in the back cavity of the two segmented molds and completely covers the butt joint between the segmented molds. The main vacuum bag is installed on the upper end of the two segmented molds and completely covers the overlap plate. The main vacuum bag also extends to the upper end face of the filling sealing colloid. The end face vacuum bag connects the main vacuum bag and the back vacuum bag and completely covers the end face connecting block.

[0009] Furthermore, the end vacuum bag and the back vacuum bag are integrated into one vacuum bag.

[0010] Furthermore, the end-face vacuum bag is bonded to the main vacuum bag.

[0011] Furthermore, the upper surface of the filling sealant is flush with the upper surface of the overlapping plate.

[0012] Furthermore, the overlapping plate is connected to the segmented mold by bolts, which pass through the segmented mold from the back cavity and are screwed to the overlapping plate.

[0013] Furthermore, the bottom surface of the lap plate is fixed with an internally threaded stud, the bottom surface of the lap clearance groove is provided with a stud clearance through hole, the internally threaded stud is located in the stud clearance through hole, and the bolt is installed in the stud clearance through hole and screwed into the internally threaded stud.

[0014] Furthermore, the sealing strip has a flange on each of its upper sides, and an expansion clearance groove between the two flanges, with the overlapping plate pressing against the upper ends of the two flanges simultaneously.

[0015] Furthermore, the sealing strip has an inwardly recessed expansion relief groove at the flange on the side of the sealing strip that contacts the side wall of the sealing groove.

[0016] As described above, the sealing connection system of the present invention has the following beneficial effects:

[0017] By setting up an overlapping plate, sealing strip, filling with sealing colloid, end face connecting block, and a sealing installation structure set on the segmented mold, the overlapping plate is used to fix and connect the two segmented molds. The overlapping plate simultaneously presses against the sealing strip in the sealing groove of the two segmented molds to achieve a seal at the joint. Since the overlapping plate presses vertically onto the sealing strip from above, the sealing strip is less likely to move during assembly, preventing damage. Furthermore, the pressure applied by the overlapping plate to the sealing strip acts directly on the sealing strip, ensuring uniform pressure along its length, resulting in good pressure application. The compression and expansion of the sealing strip forms a transverse seal perpendicular to its length, providing a good, stable, and reliable seal. Longitudinal sealing along the sealing strip direction is achieved at both ends by filling with sealing colloid, making operation convenient, reliable, and stable, and avoiding the secondary leakage risk caused by the introduction of pressure plates in existing technologies. This invention's sealing connection system can achieve connection and sealing between two segmented molds, provides good pressure application to the sealing strip, and seals the end face of the sealing strip, resulting in a stable, reliable, and easy-to-install seal. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the segmented mold and its sealing mounting structure in this invention.

[0019] Figure 2 for Figure 1 Enlarged view of circle A.

[0020] Figure 3 This is an exploded view of the sealing connection system in this invention.

[0021] Figure 4 This is an exploded view of the sealing connection system in this invention.

[0022] Figure 5 This is a schematic diagram showing the installation of the sealing strip, overlapping plate, and end face connecting block in this invention.

[0023] Figure 6 for Figure 5 Enlarged view of circle B.

[0024] Figure 7 This is a schematic diagram of the installation of the sealing strip and the end face connecting block in this invention.

[0025] Figure 8 for Figure 7 Enlarged view of circle C.

[0026] Figure 9 This is a schematic diagram showing the installation of the main vacuum bag, the back vacuum bag, and the end vacuum bag in this invention.

[0027] Figure 10 This is a schematic diagram of the overlapping plate in this invention.

[0028] Figure 11 This is a schematic cross-sectional view of the sealing strip in this invention.

[0029] Explanation of icon numbers

[0030] 1. Combination mold

[0031] 11 Block Module

[0032] 111 Segmented Surface

[0033] 12 Butt joint

[0034] 2 Sealed installation structure

[0035] 21. Overlapping avoidance groove

[0036] 211 Stud clearance through hole

[0037] 22 Sealing Groove

[0038] 23 End face clearance groove cavity

[0039] 24 Back cavity

[0040] 3. Overlap plate

[0041] 31 Internal threaded stud

[0042] 4. Sealing strip

[0043] 41 Flange

[0044] 42 Expansion clearance groove

[0045] 43 Expansion clearance groove

[0046] 44. Side of sealing strip

[0047] 5. Fill with sealant

[0048] 6 end face connecting blocks

[0049] 61 Filling cavity

[0050] 7. End-face vacuum bag

[0051] 8. Vacuum bag on the back

[0052] 9. Main vacuum bag

[0053] 10 bolts Detailed Implementation

[0054] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0055] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0056] See Figures 1 to 11 The present invention provides a sealing connection system between segmented molds in a composite material molding assembly mold. The segmented mold 11 has a mating side, and two segmented molds 11 are mated through the mating side to form a mating seam 12 between the mating sides.

[0057] The sealing system of the present invention includes an overlap plate 3, a sealing strip 4, a filling sealant 5, an end face connecting block 6, and a sealing mounting structure 2 disposed on the segmented mold 11. The sealing mounting structure 2 includes an overlap clearance groove 21 located at the mating side and extending along the mating side, a sealing groove 22 located on the bottom surface of the overlap clearance groove 21, and end face clearance cavities 23 located at both ends of the overlap clearance groove 21. The sealing strip 4 is installed in the sealing groove 22, with both ends extending out of the sealing groove 22. The overlap plate 3 is respectively installed on both sides. The overlapping relief groove 21 of the two segmented molds 11 is fixedly connected to both segmented molds 11. The overlapping plate 3 is pressed against the upper end of the sealing strip 4 and covers the butt joint 12. The upper end face of the overlapping plate 3 forms part of the mold surface. The end face connecting block 6 is installed in the end face relief groove cavity 23 and fixedly connected to the segmented mold 11. The end face connecting block 6 and the segmented mold 11 form a filling groove cavity 61. The port of the overlapping relief groove 21 and the port of the sealing groove 22 are both located in the filling groove cavity 61. The filling sealant 5 fills the filling groove cavity 61. The filling sealant 5 is formed by filling the filling groove cavity 61 with glue in a molten state and then curing it at room temperature. It can be used at high temperatures.

[0058] The basic working principle of the sealing connection system involved in this invention is as follows: the sealing installation structure 2 is pre-processed on the mating side of the segmented mold 11; after the two segmented molds 11 are mated, the sealing connection system is installed. See [link to relevant documentation]. Figure 1 and Figure 2First, two sealing strips 4 are installed into the sealing grooves 22 on the two segmented molds 11 respectively. Then, the overlapping plate 3 is installed into the overlapping clearance grooves 21 of the two segmented molds 11 and fixedly connected to both segmented molds 11. The two segmented molds 11 are fixedly connected by the overlapping plate 3. The upper end face of the overlapping plate 3 is flush with the segmented surface 111 at the upper end of the segmented mold 11, forming the mold surface together. The side of the overlapping plate 3 is preferably in contact with the side wall of the overlapping clearance groove 21 to reduce gaps. The overlapping plate 3 simultaneously presses the two sealing strips 4, and the side faces 44 of the sealing strips on both sides of the sealing strips 4 are preferably in close contact with the side walls of the sealing grooves 22, thereby achieving a seal on the butt joint 12. Furthermore, because the overlapping plate 3 presses vertically onto the sealing strip 4 from above, the sealing strip 4 is less likely to move during assembly and will not be damaged. The pressure applied by the overlapping plate 3 to the sealing strip 4 acts directly on it, ensuring uniform pressure along the entire length of the sealing strip 4, resulting in good pressure application. The compression and expansion of the sealing strip 4 creates a transverse seal perpendicular to its length, providing a good and reliable seal. Then, end-face connecting blocks 6 are installed in the end-face clearance grooves 23 at both ends. These end-face connecting blocks 6 and the segmented mold 11 form a filling groove 61. The ports of the overlapping clearance groove 21 and the sealing groove 22 are both located in the filling groove 61, meaning both ends of the sealing strip 4 extend into the filling groove 61. When molten adhesive is added to the filling groove 61, it fills the cavity well, allowing the cured sealing adhesive 5 to adhere tightly to the end faces of the sealing strip 4 and the overlapping plate 3. The segmented mold 11 can seal the gaps between the sealing strip 4 and the sealing groove 22, between the sealing strip 4 and the overlapping plate 3, and between the overlapping plate 3 and the overlapping clearance groove 21. That is, the sealing strip 4, the overlapping plate 3 and the segmented mold 11 are sealed in pairs at the end face. Therefore, by filling the sealing colloid 5, the longitudinal seal along the length of the sealing strip 4 is achieved at the end face. The operation is convenient, the effect is reliable and stable, and it can avoid the risk of secondary leakage caused by the introduction of pressure plate in the prior art.

[0059] The sealing connection system of the present invention can fix two segmented molds 11 together, and achieves sealing at the connection through sealing strip 4 and filling sealing glue 5. The pressure effect on sealing strip 4 is good, achieving lateral and longitudinal sealing. The sealing effect is stable and reliable, and it is easy to install.

[0060] See Figures 1 to 11 The present invention will be further described below with reference to a specific embodiment:

[0061] In this embodiment, see Figure 6 As a preferred design, the length of the sealing strip 4 extending from both ends of the sealing groove 22 is 20-30mm. The filling sealing colloid 5 can better stabilize the position of the sealing strip 4 and better seal it longitudinally.

[0062] In this embodiment, see Figure 1 , Figure 2 , Figure 3 and Figure 9 As a preferred design, the sealing connection system also includes a main vacuum bag 9, a back vacuum bag 8, and an end face vacuum bag 7. The segmented mold 11 has a back cavity 24 below the mating side. The back vacuum bag 8 is installed in the back cavity 24 of the two segmented molds 11 and completely covers the mating seam 12 between the segmented molds 11. The main vacuum bag 9 is installed on the upper end of the segmented mold 11 and completely covers the overlapping plate 3. The end face vacuum bag 7 connects the main vacuum bag 9 and the back vacuum bag 8 and completely covers the end face connecting block 6. The sealing strip 4, sealing groove 22, end face connecting block 6, and filling sealing colloid 5 form the first seal. The main vacuum bag 9, back vacuum bag 8, and end face vacuum bag 7 form the second seal. The main vacuum bag 9, back vacuum bag 8, and end face vacuum bag 7 are vacuum sealing bags that can tightly adhere to the surface of their location when a vacuum is formed inside the evacuated area. The main vacuum bag 9 is positioned on the mating side of the segmented mold 11, covering the segmented surface 111 and the upper surface of the overlapping plate 3 of the segmented mold 11. In other words, the main vacuum bag is installed on the mold surface formed by the segmented mold 11 and the overlapping plate 3, covering the area where the composite prepreg is laid. Simultaneously, the main vacuum bag 9 partially extends to the upper end of the filling sealant 5. After degassing, the main vacuum bag 9 adheres tightly to the upper surfaces of the segmented mold 11, the overlapping plate 3, and the filling sealant 5, achieving a seal. The back vacuum bag 8 adheres tightly to the segmented mold 11 structure at the top of the back cavity 24 and covers the mating seam 12, thereby sealing the mating seam 12 from the bottom. The end face vacuum bag 7 connects the main vacuum bag 9 and the back vacuum bag 8, and its coverage area completely includes the end face connecting block 6. Preferably, in this embodiment, the end face vacuum bag 7 and the back face vacuum bag 8 are integrated, that is, the back face vacuum bag 8 is directly connected to the main vacuum bag 9 by increasing its size, and the part covering the end face connecting block 6 constitutes the end face vacuum bag 7. Of course, the end face vacuum bag 7 can also be prepared separately and fixed to the main vacuum bag 9 and the back face vacuum bag 8 by adhesive bonding. The main vacuum bag 9, the back face vacuum bag 8 and the end face vacuum bag 7 form a second seal, further improving the seal at the joint of the separating mold.

[0063] In this embodiment, preferably, the upper surface of the filling sealant 5 is flush with the upper surface of the overlapping plate 3, that is, flush with the upper surface of the segmented mold 11, which facilitates the fabrication and installation of the main vacuum bag 9 and the end face vacuum bag 7. The upper surface of the end face connecting block 6 is also flush with the upper surface of the filling sealant 5.

[0064] In this embodiment, see Figure 4 and Figure 6The end face connecting block 6 is fixedly connected by bolts 10. The size of the end face connecting block 6 is adapted to the size of the end face clearance groove 23. After the end face connecting block 6 is installed, its side fits against the side of the end face clearance groove 23, reducing the gap.

[0065] In this embodiment, see Figure 2 , Figure 3 and Figure 10 As a preferred design, the overlapping plate 3 and the segmented mold 11 are connected by bolts 10. The bolts 10 pass through the segmented mold 11 from the back cavity 24 and enter the overlapping clearance groove 21, and are screwed onto the overlapping plate 3, thereby fixing the overlapping plate 3 in the overlapping clearance groove 21 for easy installation. More preferably, the bottom surface of the overlapping plate 3 is fixed with internally threaded studs 31. There are two rows of internally threaded studs 31, with multiple internally threaded studs 31 in each row along the length of the overlapping plate 3. Each row of internally threaded studs 31 is used to connect with one segmented mold 11. The bottom surface of the overlapping clearance groove 21 is provided with stud clearance through holes 211. The number and position of the stud clearance through holes 211 correspond to the internally threaded studs 31. During assembly, the internally threaded studs 31 are located in the stud clearance through holes 211, and the bolts 10 enter the stud clearance through holes 211 from the lower end and are screwed onto the internally threaded studs 31. By providing the internally threaded stud 31, the connection strength between the bolt 10 and the lap plate 3 can be enhanced, ensuring the installation stability of the lap plate 3. Of course, in other embodiments, if the thickness and strength of the lap plate 3 allow, the bolt 10 can also be directly screwed into the lap plate 3. In this embodiment, the length of the lap plate 3 is equal to the length of the lap clearance groove 21, and both ends of the lap plate 3 are flush with the two ends of the lap clearance groove 21, or they can slightly extend beyond the ends of the lap clearance groove 21.

[0066] In this embodiment, see Figure 2 , Figure 8 and Figure 11As a preferred design, the sealing strip 4 has a flange 41 on each side of its upper end, and an expansion relief groove 42 between the two flanges 41. When the sealing strip 4 is installed in the sealing groove 22, the sides 44 of the sealing strip on both sides are tightly fitted with the side walls of the sealing groove 22, and the overlapping plate 3 is pressed against the upper ends of the two flanges 41. Each flange 41 can achieve the sealing effect of one sealing strip 4. The expansion relief groove 42 allows the flanges 41 to expand inward when compressed or heated. Preferably, the side 44 of the sealing strip also has a concave expansion relief groove 43 at the flange 41, which allows the flanges 41 to expand outward when compressed. By setting the expansion relief groove 42 and the expansion relief groove 43, expansion space is provided for the sealing strip 4 to expand when heated later, avoiding excessive compression of the side walls of the sealing groove 22 and the overlapping plate 3 due to expansion, which would affect the sealing effect. The sealing strip 4 can achieve a double-seal effect in a single-seal groove 22, which can be well applied in areas with limited mold space. It also avoids the drawback of unstable pressure effect on the sealing strip 4 at the far end of the bolt 10 when using a so-called double-seal strip design.

[0067] As can be seen from the above, the sealing connection system of the present invention has the following technical effects:

[0068] 1. It can achieve connection and sealing between two segmented molds 11. The two segmented molds 11 are fixedly connected by the overlapping plate 3. The sealing strip 4, sealing groove 22, end face connecting block 6, and filling sealing colloid 5 form the first seal. The pressure effect on the overlapping plate 3 and sealing strip 4 is good, achieving transverse sealing. In addition, the filling sealing colloid 5 can achieve longitudinal sealing at the end face of the sealing strip 4. The sealing effect is stable and reliable, and the installation is convenient.

[0069] 2. The second seal is formed by the main vacuum bag 9, the back vacuum bag 8 and the end vacuum bag 7, which further improves the sealing at the joint of the segmented mold 11.

[0070] 3. By optimizing the structure of the sealing strip 4, a double-seal effect can be achieved on a single sealing groove 22, which improves the sealing effect and reduces the space required for installation.

[0071] In summary, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0072] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A sealing connection system between segmented molds in a composite material molding assembly mold, wherein the segmented molds (11) are joined together by their mating sides, and a mating seam (12) is formed between the mating sides of two segmented molds (11), characterized in that: The sealing system includes an overlap plate (3), a sealing strip (4), a filling sealant (5), an end face connecting block (6), and a sealing mounting structure (2) disposed on the segmented mold (11). The sealing mounting structure (2) includes an overlap clearance groove (21) located at the mating side and extending along the mating side, a sealing groove (22) located on the bottom surface of the overlap clearance groove (21), and end face clearance cavities (23) located at both ends of the overlap clearance groove (21). The sealing strip (4) is installed in the sealing groove (22), and both ends extend out of the sealing groove (22). The sealing strip sides (44) on both sides of the sealing strip (4) are tightly fitted with the side walls of the sealing groove (22). The overlap plate (3) is installed on both sides in the overlap clearance grooves (21) of the two segmented molds (11). And fixedly connected to both of the two segmented molds (11), the overlapping plate (3) is pressed on the upper end of the sealing strip (4) and covers the butt joint (12), the upper end of the sealing strip (4) is provided with a flange (41) on each side, and there is an expansion clearance groove (42) between the two flanges (41), the overlapping plate (3) is pressed on the upper end of the two flanges (41) at the same time; the upper end face of the overlapping plate (3) forms the mold surface; the end face connecting block (6) is installed in the end face clearance groove (23) and fixedly connected to the segmented mold (11), the end face connecting block (6) and the segmented mold (11) form a filling groove (61), the port of the overlapping clearance groove (21) and the port of the sealing groove (22) are both located in the filling groove (61), and the filling sealing colloid (5) fills the filling groove (61).

2. The sealing connection system according to claim 1, characterized in that: The length of the sealing strip (4) extending from both ends of the sealing groove (22) is 20~30mm.

3. The sealing connection system according to claim 1, characterized in that: It also includes a main vacuum bag (9), a back vacuum bag (8) and an end vacuum bag (7). The segmented mold (11) has a back cavity (24) located below the overlap relief groove (21). The back vacuum bag (8) is installed in the back cavity (24) of the two segmented molds (11) and completely covers the butt joint (12) between the segmented molds (11). The main vacuum bag (9) is installed on the upper end of the two segmented molds (11) and completely covers the overlap plate (3). The main vacuum bag (9) also extends to the upper end face of the filling sealant (5). The end vacuum bag (7) connects the main vacuum bag (9) and the back vacuum bag (8) and completely covers the end connecting block (6).

4. The sealing connection system according to claim 3, characterized in that: The end vacuum bag (7) and the back vacuum bag (8) are a single vacuum bag.

5. The sealing connection system according to claim 3 or 4, characterized in that: The end face vacuum bag (7) is bonded to the main vacuum bag (9).

6. The sealing connection system according to claim 3, characterized in that: The upper surface of the filling sealant (5) is flush with the upper surface of the overlapping plate (3).

7. The sealing connection system according to claim 3, characterized in that: The overlapping plate (3) is connected to the segmented mold (11) by bolts (10), which pass through the segmented mold (11) from the back cavity (24) and are screwed to the overlapping plate (3).

8. The sealing connection system according to claim 7, characterized in that: The bottom surface of the lap plate (3) is fixed with an internal threaded stud (31), and the bottom surface of the lap clearance groove (21) is provided with a stud clearance through hole (211). The internal threaded stud (31) is located in the stud clearance through hole (211), and the bolt (10) is installed in the stud clearance through hole (211) and screwed into the internal threaded stud (31).

9. The sealing connection system according to claim 1, characterized in that: The sealing strip (4) is used to contact the side wall of the sealing groove (22). The side of the sealing strip (44) is also provided with an inwardly recessed expansion relief groove (43) at the flange (41).

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