Manufacturing method of gourd-shaped outer bladder of marine airbag leak stopper

Abstract

The present invention relates to a method for manufacturing a gourd-shaped outer liner of a marine airbag-type leak stopper, characterized by the following steps: dividing the outer liner into n1 equal parts along the axial direction, straightening and unfolding the divided single-piece outer liner figure, projecting it onto a two-dimensional plane, drawing a proportional figure A using CAD software, and again drawing a proportional figure B after considering the margin, respectively producing drawings A and B, cutting the anti-cut material according to drawing B, placing drawing A on the cut anti-cut material and ensuring that the two axes coincide and are in the same direction, drawing a profile line along the outer contour of drawing A, determining a sewing margin, and sewing it into shape. Beneficial effect: The present invention designs a three-dimensional model of an outer liner with a specific profile line, determines the number of segments of an airbag model of a specific shape, divides, unfolds, and projects the surface, determines the profile line of the single-piece segment, cuts the single-piece segment considering the sewing margin, and combines it with a specific sewing technique to achieve simple, rapid, and low-cost production of the gourd-shaped outer liner while ensuring structural reliability.

Description

Technical Field

[0001] The invention belongs to the technical field, and in particular relates to a method for manufacturing a gourd-shaped outer bladder of a marine airbag leak stopper. Background Art

[0002] The most advanced method for plugging leaks in ship hull breaches is to use an airbag plug. Due to its flexible structure, airbag plugging equipment can better conform to breaches of various shapes. After the hull breach is sealed with an airbag plug, if the plugging equipment is not fixed and restrained, wave impacts and hull shaking can easily cause the airbag plugging equipment to lose contact with the hull breach, or even lose contact, resulting in a large amount of seawater entering the hull. The uncontrolled flow of seawater within the hull and the continuous increase in seawater inside the ship will cause the hull to tilt, reduce the buoyancy of the ship, and even capsize or sink. Currently, conical, cylindrical, and ellipsoidal airbag plugging equipment are more common both domestically and internationally. These airbag plugging equipment are prone to external pulling and loose contact when faced with these problems. Therefore, designing and manufacturing an airbag plug that can effectively conform to the breach and prevent external pulling can effectively solve these problems. For example, the patent document with authorization publication number CN 104369847 B discloses a marine airbag-type rapid leak plugger, which includes a composite airbag, an air intake control valve, an airbag fixing sleeve, an operating handle, a miniature high-pressure gas storage cylinder, and an air guide support rod. The composite airbag is composed of an inner sealed airbag body and an outer high-strength airbag body to form a thin-walled double-layer composite structure.

[0003] The gourd-shaped airbag leak stopper is a new type of leak-stopping equipment designed according to a certain profile. The airbag profile is formed by the outer bladder of the bladder. After the leak-stopping equipment is sealed and formed, a big head and a small head similar to a gourd will be formed. The big head is on the outside of the rupture and the small head is on the inside of the rupture. After the sealing operation, the rupture is stuck at the waist of the gourd, which can ensure that the leak stopper is prevented from being pulled out due to the protrusion of the small head under the impact of waves. Since the gourd-shaped leak stopper is arc-shaped at the waist, it can also ensure that the rupture and the bladder are tightly fitted when the leak stopper is pulled out.

[0004] The outer shell of a gourd-shaped airbag plugging device has high requirements for the shape of the line, and the shape design is relatively complex. An unreasonable shape design can easily cause the device to deform and fail to achieve the expected plugging effect. Currently, an integrated weaving method can be used to produce the gourd-shaped outer shell, but this method requires the design of a specific mold based on the actual airbag shape requirements and the use of specific weaving equipment. This is costly, complex, and difficult to fold. The outer shell that is difficult to fold will also affect the plugging operation and the storage of the equipment. Therefore, inventing a design and production method for a gourd-shaped outer shell that is simple in process, low in production cost, easy to fold and store, and can ensure shape accuracy is of great significance for plugging operations. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned technology and provide a method for manufacturing a gourd-shaped outer bladder of a marine airbag leak stopper, design a three-dimensional model of the outer bladder with a specific profile, determine the number of divisions of the airbag model with a specific shape, divide, unfold and project the surface, determine the profile of the single-piece segment, cut the single-piece segment taking into account the sewing margin of the single-piece segment, and combine it with a specific sewing technique to achieve simple, fast and low-cost production of the gourd-shaped outer bladder, while ensuring structural reliability.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a method for manufacturing a gourd-shaped outer liner of a marine airbag-type leak stopper, characterized by: dividing the outer liner into n1 equal parts along the axial direction, straightening and unfolding the divided single-piece outer liner pattern, and projecting it onto a two-dimensional plane. Using CAD software, a proportional figure A is drawn, and a proportional figure B is drawn again after taking into account the margin. Drawings A and B are respectively produced. Cut-resistant material is cut according to drawing B. Drawing A is placed on the cut-resistant material, ensuring that the two axes coincide and are in the same direction. A molding line is drawn along the outer contour of drawing A, a sewing margin is determined, and the product is sewn into shape. The specific production steps are as follows:

[0007] Step 1: Determine the gourd-shaped outer liner line

[0008] 1) According to the required size range of the leak, determine the overall length L1 of the gourd-shaped outer shell, the maximum radius R1 of the large end, the maximum radius R2 of the small end, the minimum radius R3 of the waist, the radius R4 of the oblique cone at the end, and the radius R5 of the tapered end. Based on the above dimensions, the gourd-shaped outer shell profile is preliminarily determined;

[0009] 2) Determine the precise contours of the gourd-shaped outer bladder, and divide the gourd-shaped outer bladder into n2 circular sections along the axis of the gourd-shaped outer bladder. The radius R of each circular section along the axial direction is i (i=1,2,3...n i ), draw the above process and parameters on a two-dimensional plane, connect the endpoints of the radius in sequence to form a gourd-shaped outer bladder cross-section, and rotate it 360° along the axis to form a three-dimensional gourd-shaped outer bladder;

[0010] Step 2: Determine the number and shape of the outer bladder

[0011] Divide the outer bladder into n1 equal parts: Divide the gourd-shaped 3D model into three equal parts along the axis direction. Form a plane circle on each dividing surface. Draw n3 rays in the same direction from the center of the three circles. Each ray intersects the circle at an intersection. The intersection points on the cross-sections of the three circles form a straight line. Cut the gourd-shaped outer bladder along each straight line to divide it into n1 equal parts.

[0012] Step 3: Determine the arc length of each segment and unfold it on a two-dimensional plane

[0013] 1) Take the differential method to select points as a whole: According to the first step, the top to the bottom of the axis is divided into i sections, and the radius of each section is R i ;

[0014] 2) According to the radius R of each section i and the number of splits n i ,according to Calculate the arc length of each segment;

[0015] 3) Calculate the length of the arc, straighten it, lay it flat on a two-dimensional plane, connect the arc endpoints and form a closed shape to obtain a complete stitched subunit;

[0016] Step 4: Determine the outer bladder pattern after segmentation

[0017] 1) Printing the CAD drawing of the suture subunit on an A0 drawing, cutting along the outer contour of the suture subunit to obtain pattern A;

[0018] 2) Designing the suture allowance of the suture subunits: Draw circles with a radius equal to the suture margin along the outer contour of the suture subunits on the CAD software platform. Each circle is tangent to the outer contour of the suture subunits. Connect the centers of each small circle to obtain the outer contour line of Figure B. Print the CAD drawing of Figure B on an A0 sheet and cut along the outer contour of Figure B to obtain Pattern B.

[0019] Step 5: Cut and sew subunits

[0020] Draw an axis on the cut-resistant material with drawing powder, lay the printed pattern B on the cut-resistant material, ensure that the axis of pattern B coincides with the drawn axis, and draw a contour line along the outer contour of pattern B to form a sample with a stitching margin on the cut-resistant material; then, coincide the axis of the printed pattern A with the drawn axis and ensure that the end face of the bottom end of pattern A coincides with the contour line drawn along pattern B, and draw a contour line along the outer contour of pattern A to determine the stitching margin and stitching position on the cut-resistant material. Cut along the outermost contour line to obtain a stitched sub-unit;

[0021] Step 6: Suture the subunits and shape them: align the subunits along the suture positions and sew them into shape.

[0022] Furthermore, the outer bladder segmentation in step 2 is a three-dimensional model of the profile drawn at a ratio of 1:1. The design principle is to ensure both the profile requirements and the roundness of the waist. The gourd-shaped outer bladder segmentation should be neither too many nor too few.

[0023] Furthermore, the arc length of each portion after the division described in step three is divided into more dense portions in areas with large arc changes and at waist points where sealing operations require higher requirements than in other positions.

[0024] Furthermore, when designing the stitching allowance of the stitching sub-unit as described in step 4, the inversion method of designing the cam profile is used, and the roller performs pure rolling on the cam profile to form an envelope circle. The radius of the roller during movement is the stitching allowance, and the size of the stitching allowance can also be adjusted by changing the radius of the roller.

[0025] Furthermore, the anti-cut material described in step five is mainly a fabric made of high-strength polyethylene and ceramic-based carbon fiber reinforced material. The anti-cut material has been verified by experimental tests approved by China and internationally recognized: wear resistance level 2, cut resistance level 4, tear strength level 4, and puncture resistance level 3.

[0026] Furthermore, the sewing of the suture subunit described in step six adopts a mixed method of front and back sewing and overlock sewing to ensure that the bite gap is uniform, the width is consistent, the stop is neat, and there is no burr.

[0027] Beneficial effects: The present invention has the following characteristics: 1) The outer bladder shape design method is highly versatile. In order to keep the airbag in close contact with the rupture and ensure the sealing effect, the airbag leak stopper outer bladder profile can be carefully designed, and the profile parameters can be changed to design outer bladders of different shapes, not limited to the gourd shape, and can be extended to the design of airbag outer bladders of other shapes; 2) The method is simple, accurate, and the outer bladder is easy to make. By separately determining two patterns containing sewing margins and seamless margins on the software design platform, printing and drawing the outlines respectively, determining and cutting the sewing sub-units, and sewing the airbag leak stopper according to a certain sewing method; 3) The use of a petal splicing processing method simplifies the manufacturing process, reduces the processing difficulty and production cost, but can ensure the manufacturing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the parameter diagram of the outer bladder of the gourd-shaped airbag

[0029] Figure 2 It is a schematic diagram of the segmentation of the three-dimensional model of the gourd-shaped airbag outer bladder;

[0030] Figure 3 This is a schematic diagram of the division of the gourd-shaped airbag outer bladder;

[0031] Figure 4 This is a schematic diagram of a gourd-shaped airbag outer bladder segmentation subunit;

[0032] Figure 5 It is a schematic diagram of the gourd-shaped airbag outer bladder segmentation subunit unfolded in a two-dimensional plane;

[0033] Figure 6 Schematic diagram of the generation of gourd-shaped airbag outer bladder segmentation sub-units including margin patterns;

[0034] Figure 7Schematic diagram of gourd-shaped airbag outer bladder segmentation subunit including margin pattern;

[0035] Figure 8 This is a schematic diagram of the suture of the divided subunits of the gourd-shaped airbag outer bladder;

[0036] Figure 9 It is a schematic diagram of the forward and reverse sewing method;

[0037] Figure 10 This is a schematic diagram of the overlock method. DETAILED DESCRIPTION

[0038] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0039] In the various embodiments of the present invention, for ease of description and not limitation, the term "connection" used in the patent application specification and claims is not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "below," "left," and "right" are used solely to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0040] See the attached drawings for details. This embodiment provides a method for designing and manufacturing a gourd-shaped outer bladder for a marine airbag-type leak stopper. The outer bladder is divided into n1 equal parts along the axial direction, and the divided single-piece outer bladder figure is straightened and unfolded, projected onto a two-dimensional plane, and a proportional figure A is drawn using CAD software. The sewing allowance is determined, and a proportional figure B is drawn again after taking the allowance into account. Drawings A and B are respectively produced. The anti-cut material is cut according to drawing B. Drawing A is placed on the cut anti-cut material and ensures that the two axes coincide and are in the same direction. The profile line is drawn along the outer contour of drawing A to determine the sewing margin. A mixed method of back-and-forth sewing (front and back sewing) and overlock sewing is adopted. The combination of the two sewing methods can ensure that the outer bladder has a beautiful shape, is strong and durable, has a long service life cycle, and is highly reliable. The specific design and production plan is as follows:

[0041] 1. Determine the gourd-shaped outer bladder line

[0042] 1) According to the size range of the leak plugging hole, determine the overall length L1 of the gourd-shaped outer shell, the maximum radius R1 of the large end, the maximum radius R2 of the small end, the minimum radius R3 of the waist, the radius R4 of the oblique cone surface at the end, and the radius R5 of the tapered end. The gourd-shaped outer shell profile is preliminarily determined based on the above dimensions.

[0043] 2) Determine the precise contour lines of the gourd-shaped outer bladder. Divide the gourd-shaped outer bladder into n2 circular sections along the axis of the gourd-shaped outer bladder, and design the radius R of each circular section divided along the axial direction. i (i=1,2,3...n i ), draw the above process and parameters on a two-dimensional plane, connect the end points of the radius in sequence to form a gourd-shaped outer liner cross-section with precise profile lines, and rotate it 360° along the axis to form a three-dimensional outer liner with precise shape.

[0044] 2. Determine the number and shape of the outer bladder

[0045] Considering that too many parts will lead to more stitching edges and insufficient strength of the outer bladder; if the number of stitching parts is small, the shape cannot be guaranteed and the bundle effect is not good. According to the needs of specific application scenarios, the outer bladder can be divided into n1 equal parts. The gourd-shaped outer bladder must meet the requirements of the shape line and the circumference of the waist. The gourd-shaped outer bladder cannot be divided too much or too little. The method is to draw a designed specific shape line three-dimensional model in a 1:1 ratio, divide the gourd-shaped three-dimensional model into three equal parts along the axis direction, form a plane circle on each dividing surface, draw n3 rays in the same direction at the center of the three circles, each ray has an intersection with the circle, and the intersection on the cross section of the three circles forms a straight line. Cut the gourd-shaped outer bladder along each straight line to divide the outer bladder into n1 equal parts. The present invention is explained by dividing it into 6 equal parts.

[0046] 3. Determine the arc length of each segment and unfold it on a two-dimensional plane

[0047] 1) Take the idea of ​​differential to select points. According to the first step, the top to bottom of the axis is divided into i sections, and the radius of each section is R i (Taking into account the design accuracy of the outer bladder profile, the number of equal parts can be closer in areas with large curvature changes and at the waist where sealing operations require higher requirements).

[0048] 2) According to the radius R of each section i and the number of splits n i ,according to The arc length of each part can be calculated.

[0049] 3) Calculate the length of the arc, straighten it, lay it flat on a two-dimensional plane, connect the arc endpoints and form a closed shape to obtain a complete stitching subunit.

[0050] 4. Determine the outer bladder pattern after segmentation

[0051] 1) Considering that the sewing material is a two-dimensional plane during sewing, the CAD drawing of the sewing subunit determined above is printed on an A0 drawing, and pattern A can be obtained by cutting along the outer contour line of the subunit.

[0052] 2) Considering the need for margin when stitching the subunits, Pattern B was designed using a CAD software design platform. The idea was to draw circles with a radius equal to the stitching margin along the outer contours of the subunits. Each circle was tangent to the outer contours of the subunits. Connecting the centers of each small circle yielded the outer contour of Pattern B. The CAD drawing of Pattern B, determined above, was printed onto an A0 sheet and cut along its outer contour to yield Pattern B.

[0053] 5. Cutting sub-units

[0054] Draw an axis on the cut-resistant material with drawing powder, lay the printed pattern B on the cut-resistant material, ensure that the axis of pattern B coincides with the drawn axis, and draw the contour line along the outer contour of pattern B to form a sample with a stitching margin on the cut-resistant material. Remove pattern B, overlap the axis of printed pattern A with the drawn axis and ensure that pattern A coincides with the end face at the bottom end of the contour line drawn along pattern B, draw the contour line along the outer contour of pattern A, and the stitching margin and stitching position can be determined on the cut-resistant material. Cut along the outermost contour line to obtain the stitching subunit. The cut-resistant material of this embodiment is mainly made of a fabric made of high-strength polyethylene and ceramic-based carbon fiber reinforced material. The cut-resistant material has been verified by experimental tests recognized by China and internationally recognized: wear resistance level 2, cut resistance level 4, tear resistance level 4, and puncture resistance level 3.

[0055] 6. Suture the sub-units and form them

[0056] Align and sew each suture sub-unit along the determined suture position. To ensure that the bite gap is uniform, the width is consistent, the stop is neat, and there is no burr, a combination of front and back sewing and overlock sewing methods is used. The combination of the two sewing methods can ensure that the outer bladder has a beautiful shape, is strong and durable, has a long service life and is highly reliable.

[0057] The present invention mainly solves four technical problems: first, it realizes the design and production of airbag-type leak-stopping device outer shells of different shapes; second, it designs a method for quickly obtaining outer shell suture sub-units; third, it adopts the base circle tangent method to accurately obtain the suture margin; fourth, it realizes the low-cost, high-precision and high-reliability design and production of airbag-type leak-stopping equipment outer shells.

[0058] The working principle of the present invention is:

[0059] 1. The outer shell of the airbag leak stopper with different profiles can be designed according to the size of the leak-blocking hole R. The overall length of the outer shell L1, the maximum radius of the large end R1, the maximum radius of the small end R2, the minimum radius of the waist R3, the radius of the oblique cone at the closing end R4, and the radius of the tapered opening R5 can be adjusted.

[0060] The outer shell of the airbag leak stopper can be designed with different profiles, not limited to the gourd shape (for example, when R3<R2<R1, the profile can be designed into a gourd-shaped airbag by adjusting the positions of R3-R2, R3-R1, R1 to the bottom of the airbag, and R2 to the closing position; when the profile meets the requirements, the outer shell of the airbag ... When the airbag is installed, it can be designed as a conical airbag).

[0061] 2. A fast segmentation method for the suture subunits of the outer bladder was designed. By dividing the three-dimensional model of the outer bladder into multiple planes along the axial direction in the software platform, the differential method was used to take points as a whole to determine the spacing Δy between each plane. According to the differential formula Δy=f(x+Δx)-f(x)=f'(x)·Δx+o(Δx), it can be seen that the gourd-shaped outer curve can be approximated by a straight line at this time, that is, the function linearization is realized. When determining the overall arc length, the local tiny points are connected and the curve is approximated by a straight line to form the arc length. Accordingly, the top to the bottom closing point along the axial direction is divided into i sections, and the radius of each section is R i , and number them one by one: R1, R2, R3…R n .

[0062] 3. The base circle tangency method accurately obtains the stitching margin. To ensure uniform stitching margins, a series of base circles tangent to the outer contour of the pattern without stitching margins are drawn along the contour line. Ensure that each base circle is tangent to the outer contour line. Connect the centers of each base circle to form a closed contour line to form a pattern with stitching margins.

[0063] 4. The integrated design and production method of 3D design, flap splicing, and mixed sewing is adopted. The 3D software design platform ensures the accuracy of the design line. The flap splicing method simplifies the processing technology, reducing the processing difficulty and production cost. The mixed use of front and back seams and overlock seams makes the outer shell beautiful, strong and durable, ensuring the life cycle and reliability.

[0064] The above-mentioned detailed description of the method for making a gourd-shaped outer liner of a marine airbag leak stopper with reference to the embodiment is illustrative rather than restrictive, and several embodiments can be listed according to the limited scope. Therefore, changes and modifications without departing from the overall concept of the present invention should fall within the scope of protection of the present invention.

Claims

1. A method for manufacturing a gourd-shaped outer bladder of a marine airbag leak stopper, characterized by: The outer liner is divided into n1 equal parts along the axis direction. The divided single outer liner pattern is straightened and unfolded, and projected onto a two-dimensional plane. A proportional pattern A is drawn using CAD software. A proportional pattern B is drawn again after taking into account the margin. Drawings A and B are made separately. The anti-cut material is cut according to drawing B. Drawing A is placed on the cut anti-cut material, ensuring that the two axes coincide and are in the same direction. The molding line is drawn along the outer contour of drawing A, the sewing margin is determined, and the product is sewn into shape. The specific production steps are as follows: Step 1: Determine the gourd-shaped outer liner line 1) According to the required size range of the leak, determine the overall length L1 of the gourd-shaped outer shell, the maximum radius R1 of the large end, the maximum radius R2 of the small end, the minimum radius R3 of the waist, the radius R4 of the oblique cone at the end, and the radius R5 of the tapered end. Based on the above dimensions, the gourd-shaped outer shell profile is preliminarily determined; 2) Determine the precise contours of the gourd-shaped outer bladder, and divide the gourd-shaped outer bladder into n2 circular sections along the axis of the gourd-shaped outer bladder. The radius R of each circular section along the axial direction is i (i=1,2,3...n i ), draw the above process and parameters on a two-dimensional plane, connect the endpoints of the radius in sequence to form a gourd-shaped outer bladder cross-section, and rotate it 360° along the axis to form a three-dimensional gourd-shaped outer bladder; Step 2: Determine the number and shape of the outer bladder Divide the outer bladder into n1 equal parts: Divide the gourd-shaped 3D model into three equal parts along the axis direction. Form a plane circle on each dividing surface. Draw n3 rays in the same direction from the center of the three circles. Each ray intersects the circle at an intersection. The intersection points on the cross-sections of the three circles form a straight line. Cut the gourd-shaped outer bladder along each straight line to divide it into n1 equal parts. Step 3: Determine the arc length of each segment and unfold it on a two-dimensional plane 1) Take the differential method to select points as a whole: According to the first step, the top to the bottom of the axis is divided into i sections, and the radius of each section is R i ; 2) According to the radius R of each section i and the number of splits n i ,according to Calculate the arc length of each segment; 3) Calculate the length of the arc, straighten it, lay it flat on a two-dimensional plane, connect the arc endpoints and form a closed shape to obtain a complete stitched subunit; Step 4: Determine the outer bladder pattern after segmentation 1) Printing the CAD drawing of the suture subunit on an A0 drawing, cutting along the outer contour of the suture subunit to obtain pattern A; 2) Designing the suture allowance of the suture subunits: Draw circles with a radius equal to the suture margin along the outer contour of the suture subunits on the CAD software platform. Each circle is tangent to the outer contour of the suture subunits. Connect the centers of each small circle to obtain the outer contour line of Figure B. Print the CAD drawing of Figure B on an A0 sheet and cut along the outer contour of Figure B to obtain Pattern B. Step 5: Cut and sew subunits Draw an axis on the cut-resistant material with drawing powder, lay the printed pattern B on the cut-resistant material, ensure that the axis of pattern B coincides with the drawn axis, and draw a contour line along the outer contour of pattern B to form a sample with a stitching margin on the cut-resistant material; then, coincide the axis of the printed pattern A with the drawn axis and ensure that the end face of the bottom end of pattern A coincides with the contour line drawn along pattern B, and draw a contour line along the outer contour of pattern A to determine the stitching margin and stitching position on the cut-resistant material. Cut along the outermost contour line to obtain a stitched sub-unit; Step 6: Sewing the sub-units and forming them: align the sewing sub-units along the sewing positions and sew them into shape.

2. The method for manufacturing the gourd-shaped outer bladder of the marine airbag leak stopper according to claim 1 is characterized by: The outer bladder division described in step 2 is a three-dimensional model of the profile drawn at a ratio of 1:

1. The design principle is to ensure both the profile requirements and the roundness of the waist. The gourd-shaped outer bladder division should be neither too many nor too few.

3. The method for manufacturing the gourd-shaped outer bladder of the marine airbag leak stopper according to claim 1 is characterized by: The arc length of each portion after the division described in step 3 is divided more densely in areas with large arc changes and waist areas with higher sealing requirements than in other positions.

4. The method for manufacturing the gourd-shaped outer bladder of the marine airbag leak stopper according to claim 1 is characterized by: When designing the stitching allowance of the stitching sub-unit as described in step 4, the inversion method of designing the cam profile is used. The roller performs pure rolling on the cam profile to form an envelope circle. The radius of the roller during movement is the stitching allowance. The size of the stitching allowance can also be adjusted by changing the radius of the roller.

5. The method for manufacturing the gourd-shaped outer bladder of the marine airbag leak stopper according to claim 1 is characterized by: The anti-cut material in step five is a fabric made of high-strength polyethylene and ceramic-based carbon fiber reinforced material.

6. The method for manufacturing the gourd-shaped outer bladder of the marine airbag leak stopper according to claim 1, characterized in that: The sewing of the suture subunit described in step 6 adopts a mixed method of front and back sewing and overlock sewing to ensure that the bite gap is uniform, the width is consistent, the stop is neat, and there is no fuzz.

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