A sewing device and a sewing method for a narrow-gauge rotary fabric

Abstract

The invention relates to a kind of sewing device of narrow cavity class rotary fabric, including clamping fixing device, support device and sewing mould;The optical axis of the clamping fixing device is installed support device, and the support device includes large support plate and small support plate;Sewing mould is installed between the large support plate and small support plate, and the sewing mould includes inner pressure plate and outer pressure plate;During sewing process, inner pressure plate and outer pressure plate clamp the class rotary fabric to be sewn in the middle, and the small support plate and the large support plate are respectively installed at the upper and lower ends of the class rotary fabric;Equal-distance straight-slot is opened on the outer pressure plate, and the fiber sewing thread passes through the class rotary fabric.This invention also includes the sewing method using the above-mentioned sewing device.The invention adopts new type of improved lock type sewing method to sew the class rotary fabric as a whole, and first punches preformed hole while using the method of bottom thread outer wear, overcomes the problem that the interior space of fabric is narrow and not easy to sew, and improves the fabric interlayer strength.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material preform processing, and in particular relates to a sewing device and a sewing method for rotary fabrics with narrow cavities. Background Art

[0002] Composite material preform stitching technology is a composite material preform preparation technology that uses fiber stitching lines to combine multiple layers of fabric or multiple separate pieces of fabric into an integral structure. It is widely used in high-tech fields such as aerospace, national defense, and rail transportation.

[0003] In the existing process technology, the composite material preform stitching methods include single-sided stitching and double-sided stitching. Single-sided stitching includes tufted stitching, double-needle blind stitching and I-fiber stitching, and double-sided stitching includes N-type path stitching and improved lock stitching.

[0004] The yarns used in tufted stitching are easy to break and have no locking effect, making it difficult to sew preform fabrics with a high bulk density; the thickness of the double-needle blind stitch is relatively thin and cannot be used to sew high-thickness preforms; I-fiber stitching uses compressed air and a hollow needle tube to implant the yarn into the thickness direction of the preform fabric. Due to the large needle hole, there is a problem of the yarn easily falling off; the N-path stitching process requires a large operating space and is difficult to use for stitching fabrics with a small internal space; like tufted stitching, the yarns used in the improved lock stitching process are also prone to wear and breakage during the stitching process. In summary, the existing preform stitching methods are difficult to meet the high-quality stitching and molding requirements for preform fabrics with high density, high thickness, and a small internal space. Therefore, it is necessary to explore a stitching device and stitching method for rotary fabrics with a narrow cavity. Summary of the Invention

[0005] In order to solve the technical problems existing in the known technology, the present invention provides a sewing device and a sewing method for a rotary fabric with a narrow cavity, which meets the sewing preparation needs of a rotary fabric with a small internal space, irregular shape and large axial size.

[0006] The present invention includes the following technical solutions:

[0007] A sewing device for a quasi-rotational fabric with a narrow cavity, comprising a clamping and fixing device, a supporting device and a sewing mold; the supporting device is installed on the optical axis of the clamping and fixing device, and the supporting device comprises a large support plate and a small support plate; the sewing mold is installed between the large support plate and the small support plate, and the sewing mold comprises an inner pressure plate and an outer pressure plate; during the sewing process, the inner pressure plate and the outer pressure plate clamp the quasi-rotational fabric to be sewn in the middle, and the small support plate and the large support plate are respectively installed at the upper and lower ends of the quasi-rotational fabric; the outer pressure plate is provided with equidistant straight grooves for the fiber sewing thread to pass through the quasi-rotational fabric.

[0008] Further, the clamping and fixing device further comprises a T-shaped groove workbench, a connecting bottom plate, a three-jaw chuck, an optical shaft, and a set of optical shaft fixing seats; the connecting bottom plate is fixed on the T-shaped groove workbench, the three-jaw chuck is connected with the connecting bottom plate, the optical shaft is fixed on the T-shaped groove workbench through the three-jaw chuck, and the whole can be moved and rotated according to requirements; the shaft end of the optical shaft fixing seat is provided with two double-cut edge openings and two threaded holes, the optical shaft fixing seat is connected with the large support plate or the small support plate and is fixed and clamped on the optical shaft; the position of the optical shaft fixing seat on the optical shaft can be adjusted according to requirements, so that the position of the support device and the stitching mold is adjusted up and down.

[0009] Further, the large support plate and the small support plate each comprise a clamping and connecting part, a fabric support part, and a wire screw sleeve; the clamping and connecting part is provided with an optical shaft hole with a diameter equal to that of the optical shaft, is sleeved on the optical shaft through the optical shaft hole, and is provided around the optical shaft hole with four light holes corresponding in size and position to the four light holes provided on the base of the optical shaft fixing seat, is connected and fixed with the optical shaft fixing seat through the matched hexagonal bolts and hexagonal nuts, and is provided with a wire screw sleeve embedded in the fabric support part, and the inner pressure plate and the outer pressure plate of the stitching mold are detachably installed through the connection of the hexagonal bolts and the wire screw sleeve.

[0010] Further, the inner pressure plate is divided into 23 pieces, is convenient for being taken down in sections during stitching, and is thus favorable for fabric stitching; the inner pressure plate is fitted to the inner cavity of the quasi-rotary fabric after assembly; the outer pressure plate is divided into six pieces, is respectively provided with three large curved surface positions and three corner positions connected by curved surfaces, is convenient for installation and compression and regulation of the thickness of the fabric, is convenient for being provided with straight grooves on the outer pressure plate to provide stitching positions, and is thus favorable for guaranteeing the stitching line distance; the outer pressure plate is fitted to the outer surface of the quasi-rotary fabric after assembly.

[0011] Further, the thicknesses of the inner pressure plate and the outer pressure plate are each 10 mm; the inner pressure plate and the outer pressure plate are provided with through holes that are staggered with each other and are connected with the fabric support part; the through holes of the inner pressure plate and the outer pressure plate are not embedded with wire screw sleeves, which is economical and convenient and improves the durability of the stitching device to a certain extent, so that the through holes of the inner pressure plate and the outer pressure plate are staggered with each other to connect the wire screw sleeves embedded in different fabric support parts. In addition, because the internal space is small, it is inconvenient to install the inner pressure plate and the outer pressure plate in the through holes at the corners, so the through holes at the corners are all provided as through holes with an inclination angle in the horizontal direction. The thickness of the fabric is controlled through compression by adjusting the regulation bolts connected with the fabric support part; the straight grooves on the outer pressure plate are 3 mm in width, and the distance between adjacent grooves is 5 mm.

[0012] Further, the large support plate, the small support plate, the inner pressure plate, and the outer pressure plate are all made of resin base through 3D printing technology according to the shape of the quasi-rotary fabric.

[0013] A method for sewing a rotating fabric with a narrow cavity, using the above-mentioned sewing device, comprises the following steps:

[0014] S1. Fabric layup design: Design the fabric layup according to the technical requirements of the shape, thickness, size of the quasi-rotational fabric and the specifications of the carbon fiber spread fabric; cut the carbon fiber spread fabric according to the layup design to form a spread fabric of appropriate size;

[0015] S2. Laying the carbon fiber spreader cloth: Assemble the inner pressure plate of the stitching mold, and lay each unit layer of carbon fiber spreader cloth on the inner pressure plate of the stitching mold in sequence according to the layer layout design. After the spreader cloth is laid, assemble the outer pressure plate of the stitching mold;

[0016] S3. Planning the suture trajectory: Set the suture point spacing according to technical requirements, print a suture ruler with set intervals, cut the suture ruler into strips, and stick it on the partition between two adjacent straight grooves of the outer pressure plate of the suture mold; the setting of the suture ruler allows suture to be performed along the length of the groove according to the ruler, thereby controlling the suture point distance;

[0017] S4. Stitching the quasi-rotational fabric: According to the stitching trajectory planned in S3, the quasi-rotational fabric is stitched as a whole using an improved lock stitching method in which prefabricated holes are first punched and the bottom line is passed outside.

[0018] Furthermore, the S1 fabric layup design includes S1-1 layup design and S1-2 carbon fiber spread fabric cutting; S1-1 uses relevant design software to draw the upper and lower end view shapes of the quasi-rotational fabric, divides the quasi-rotational fabric into N unit layers equidistantly according to thickness to obtain a layup plane design drawing, and then imports the above-drawn quasi-rotational fabric layup plane design drawing into another design software to loft it layer by layer into a three-dimensional graphic, and divides and flattens each unit layer; S1-2 exports each unit layer divided and flattened in S1-1 into a two-dimensional graphic, marks the unit layer division position on each two-dimensional graphic, writes a cutting program for a cutting table according to the flattened layup model, and uses the cutting table to cut the carbon fiber spread fabric.

[0019] Furthermore, in S1-1, each unit layer is split and flattened, that is, each unit layer is split and flattened in sequence at seven equally spaced locations. Because the corners of the quasi-rotational fabric have a large curvature, the carbon fiber spread fabric is relatively flat and difficult to conform to the large curvature at these corners. Furthermore, the corners of the quasi-rotational fabric are subjected to greater stress during application, so these corners are avoided, and the layup cuts of each layer of spread fabric skip the large curvature corners. In S1-1, the split locations of each layer are set according to the plane intersection, with the cuts of each layer staggered. The split and flattening are performed sequentially at layup angles of 30 degrees, 100 degrees, 330 degrees, 130 degrees, 270 degrees, 70 degrees, and 210 degrees. This split location design prevents the cuts from affecting the overall thickness of the quasi-rotational fabric and avoids the relatively weak overlap performance caused by overlapping cuts of each layer during the layup of the carbon fiber spread fabric.

[0020] Furthermore, the structure of the carbon fiber spread fabric in S1-2 is a plain weave, and the specifications of the spread fabric are a grid width of 8 to 9 mm and a surface density of 200 to 205 g / m² or a grid width of 16 to 17 mm and a surface density of 100 to 105 g / m². 2 Or the grid width is 20-21mm, the surface density is 80-85g / m 2 .

[0021] Furthermore, in the S2, the carbon fiber spreader cloth is laid, and first the inner pressure plate of the stitching mold is assembled, and the 23 inner pressure plates of the stitching mold are arranged according to the shape of the inner cavity of the stitched fabric, and are connected in sequence with wire screw sleeves by bolts, and are installed on the inner side of the fabric support part of the large support plate and the small support plate; then the carbon fiber spreader cloth cut in S1-2 is laid on the inner pressure plate of the stitching mold according to the layup design, and each unit layer is ensured to be tightly fitted with the inner pressure plate of the stitching mold or the upper layer of spreader cloth during laying; after the spreader cloth is laid, the outer pressure plate of the stitching mold is assembled, and the 6 outer pressure plates of the stitching mold are arranged according to the shape of the outer surface of the stitched fabric, and are connected in sequence with wire screw sleeves by regulating bolts, and are installed on the outer side of the fabric support part of the large support plate and the small support plate, and the fabric thickness is controlled by regulating bolt compression.

[0022] Furthermore, when laying in S2, it is necessary to ensure that the carbon fiber spread cloth fits tightly with the pressure plate inside the sewing mold or the previous layer of spread cloth. However, since the shape of the fabric and the pressure plate inside the sewing mold is an irregular quasi-rotational structure with negative curvature, and the carbon fiber spread cloth is relatively flat and has a certain toughness, the spread cloth cannot fit tightly when laid. Therefore, when laying the first layer of spread cloth, a slender suture needle with a fiber suture thread is passed through the gap between the inner pressure plates and the hollow inner cavity to sew and tighten the two sides of the spread cloth laid on the inner pressure plate to fix it on the inner pressure plate. After that, when laying each layer of spread cloth, a curved needle pre-sewing method is used to sew and connect it with the laid spread cloth. After all the spread cloths are laid, all the pre-sewn fiber suture threads are pulled out, so as to achieve the purpose of making the spread cloth fit tightly with the pressure plate inside the sewing mold or the previous layer of spread cloth.

[0023] Furthermore, the S4 suture-type rotating fabric: when suturing, the inner pressure plate corresponding to the suture position is removed, and the fabric is sewed in sequence at the open groove position according to the marks on the suture ruler; first, a punching needle is used to punch a preset hole at the suture point, and then a suture needle with a fiber suture thread is introduced into the fabric along the prefabricated hole to form a thread loop, and a hook needle is used to hook the thread loop out of the large end opening of the fabric, and after tying it with the bottom thread reserved outside the suture mold, the fiber suture thread is brought out by the suture needle for the next cycle, thereby suturing the fabric.

[0024] The present invention has the following advantages and positive effects:

[0025] 1. The present invention adopts a new improved lock-stitching method to sew the entire quasi-rotational fabric. Pre-made holes are first punched, and the bottom thread is passed outside. This overcomes the problem of small internal space of the fabric and difficulty in sewing. It also reduces the wear and breakage of the suture thread, improves the interlayer strength of the fabric, reduces in-plane fiber damage, and has a relatively high damage tolerance.

[0026] 2. The present invention uses resin-based 3D printing technology to manufacture the support device and the suturing mold, which has the advantage of low manufacturing cost, and by embedding wire screw sleeves in the threaded connection parts, the stability of the connection and the durability of the suturing device are enhanced.

[0027] 3. The present invention cross-divides each unit layer at seven positions and cross-distributes the interface positions during layer laying, thereby avoiding the impact of the cuts on the overall thickness and local performance of the quasi-convolution fabric and ensuring the overall structural strength of the preform fabric.

[0028] 4. The present invention adopts a curved needle pre-stitching method to fix the layers, which ensures the tightness of the layers in the negative curvature area of ​​the quasi-revolutionary curved surface preform and improves the layer density and overall volume density of the preform.

[0029] 5、The suture trajectory planning of the present application sets the suture trajectory by setting the interval suture scale, improves the accuracy of the suture point spacing, and improves the suture quality.

[0030] 6、The present application adopts large support plate, small support plate, inner pressure plate and outer pressure plate to clamp, suture support and compress the suture fabric, increases the fiber volume content of the fabric, thereby improving the strength of the suture fabric.

[0031] 7、The present application adopts the mode of sequentially removing the inner pressure plate corresponding to the suture position during suture, so that the fabric will not deform due to suture stress. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a schematic diagram of the suture device structure;

[0033] Figure 2 It is a schematic diagram of the large support plate structure;

[0034] Figure 3 It is a schematic diagram of the small support plate structure; Figure 2

[0035] Figure 4 It is a schematic diagram of the suture mold top structure;

[0036] Figure 5 It is a schematic diagram of the inner pressure plate three-dimensional structure;

[0037] Figure 6 It is a schematic diagram of the outer pressure plate three-dimensional structure;

[0038] Figure 7 It is a schematic diagram of the outer pressure plate three-dimensional structure;

[0039] Figure 8 It is a schematic diagram of the outer pressure plate three-dimensional structure;

[0040] Figure 9 It is a schematic diagram of the outer pressure plate three-dimensional structure; Figure 8

[0041] Figure 10 It is a schematic diagram of the outer pressure plate three-dimensional structure;

[0042] Figure 11 It is a schematic diagram of the outer pressure plate three-dimensional structure;

[0043] Figure 12 It is a schematic diagram of the outer pressure plate three-dimensional structure; Figure 11

[0044] Figure 13 It is a schematic diagram of the outer pressure plate three-dimensional structure;

[0045] Figure 14 ​​​It is a sewing flow chart for rotary fabrics;

[0046] In the figure, 1 is a T-slot workbench; 2 is a connecting base; 3 is a three-jaw chuck; 4 is an optical axis; 5 is an optical axis fixing seat;

[0047] 6 is a large support plate; 6-1 is a clamping connection portion of the large support plate; 6-2 is a fabric support portion of the large support plate; 6-3 is a wire screw sleeve;

[0048] 7 is a sewing mold; 7-1 is an inner pressure plate; 7-2 is an outer pressure plate;

[0049] 8 is a small support plate; 8-1 is a clamping connection portion of the small support plate; 8-2 is a fabric connection portion of the small support plate;

[0050] 9 is a quasi-rotation fabric; 9-1 is a 30° split point; 9-2 is a 100° split point; 9-3 is a 330° split point; 9-4 is a 130° split point; 9-5 is a 270° split point; 9-6 is a 70° split point; 9-7 is a 210° split point;

[0051] 10 is a unit layer; 11 is a suture track; 12 is a suture ruler; 13 is a fiber suture line; 14 is a suture needle; 15 is a bottom line; 16 is a hook needle; and 17 is a punching needle. DETAILED DESCRIPTION

[0052] In order to further disclose the content, features and effects of the present invention, the following examples are given and described in detail with reference to the accompanying drawings.

[0053] Example:

[0054] See attached Figure 1-7 A device for sewing a quasi-rotational fabric with a narrow cavity comprises a clamping device, a support device, and a sewing die 7. The support device is mounted on the optical axis 4 of the clamping device, and comprises a large support plate 6 and a small support plate 8. The sewing die 7 is mounted between the large support plate 6 and the small support plate 8, and comprises an inner pressure plate 7-1 and an outer pressure plate 8-1. During the sewing process, the inner pressure plate 7-1 and the outer pressure plate 8-1 clamp the quasi-rotational fabric 9 to be sewn between them, and the large support plate 6 and the small support plate 8 are mounted on the upper and lower ends of the quasi-rotational fabric 9, respectively. The outer pressure plate 7-2 is provided with equidistant straight grooves for passing the fiber sewing thread 13 through the quasi-rotational fabric 9. The large support plate 6, the small support plate 8, the inner pressure plate 7-1, and the outer pressure plate 7-2 are all manufactured using a resin-based 3D printing technology according to the shape of the quasi-rotational fabric 9.

[0055] like Figure 1As shown, the clamping and fixing device also includes a T-slot workbench 1, a connecting base plate 2, a three-jaw chuck 3, an optical axis 4 and a group of optical axis fixing seats 5. The connecting base plate 2 is fixed on the T-slot workbench 1 through T-nuts and bolts, the three-jaw chuck 3 is connected to the connecting base plate 2 through bolts, and the optical axis 4 is fixed on the T-slot workbench 1 through the three-jaw chuck 3, and the overall translation and rotation can be achieved according to needs; the shaft end of the optical axis fixing seat 5 is provided with two double-cut edge openings and two threaded holes, and the optical axis fixing seat 5 is fixedly clamped on the optical axis 4 by hexagonal bolts, and the position of the optical axis fixing seat 5 on the optical axis 4 can be adjusted according to needs to adjust the position of the supporting device and the stitching mold 7 up and down; the base of the optical axis fixing seat 5 is provided with four light holes, and the optical axis fixing seat 5 is connected to the large support plate 6 or the small support plate 8.

[0056] like Figures 1-4 As shown, the large support plate 6 includes a large support plate clamping connection part 6-1 and a large support plate fabric support part 6-2; the small support plate 8 includes a small support plate clamping connection part 8-1 and a small support plate fabric support part 8-2; the large support plate clamping connection part 6-1 and the small support plate clamping connection part 8-1 are both provided with an optical axis hole with the same diameter as the optical axis 4, which is used to be mounted on the optical axis 4; four light holes are provided around the optical axis hole, which are the same size and position as the four light holes provided on the base of the optical axis fixing seat 5, and are connected and fixed to the optical axis fixing seat 5 by matching hexagonal bolts and hexagonal nuts; the large support plate fabric support part 6-2 and the small support plate fabric support part 8-2 are both inlaid with wire screw sleeves 6-3, and the inner pressure plate 7-1 and the outer pressure plate 7-2 of the sewing mold 7 are detachably installed by connection with the hexagonal bolts and the wire screw sleeves.

[0057] like Figure 5-Figure 7 As shown, the inner pressure plate 7-1 is divided into 23 pieces, which is convenient for segmented removal during sewing, thereby facilitating fabric sewing; after assembly, the inner pressure plate 7-1 is in contact with the inner cavity of the quasi-rotational fabric 9; the outer pressure plate 7-2 is divided into 6 pieces, which are respectively located at three large curved surface positions and three corner positions connected to the curved surfaces, which facilitates installation and compression control of fabric thickness, and is convenient for providing straight grooves for sewing positions on the outer pressure plate 7-2, thereby facilitating ensuring sewing line spacing; after assembly, the outer pressure plate 7-2 is in contact with the outer surface of the quasi-rotational fabric 9; The thickness of the inner pressure plate 7-1 and the outer pressure plate 7-2 are both 10 mm; the inner pressure plate 7-1 and the outer pressure plate 7-2 are provided with staggered through holes connected to the large support plate fabric support part 6-2 and the small support plate fabric support part 8-2; the fabric thickness is compressed and controlled by adjusting the regulating bolts connecting the outer pressure plate 7-2 and the large support plate fabric support part 6-2 and the small support plate fabric support part 8-2; the straight groove on the outer pressure plate 7-2 is 3 mm wide, and the distance between adjacent grooves is 5 mm.

[0058] See attached Figure 1-14 The present invention also provides a method for sewing a type of rotary fabric with a narrow cavity, using the above-mentioned sewing device, including the following steps: S1 designing the fabric layup, S2 laying the carbon fiber widening cloth, S3 planning the sewing trajectory and S4 sewing the type of rotary fabric.

[0059] The S1 design fabric layup includes S1-1 layup design and S1-2 carbon fiber spread fabric cutting. First, S1-1 uses relevant design software to draw the shape of the upper and lower ends of the quasi-rotational fabric 9, and divides the quasi-rotational fabric 9 into six unit layers 10 at equal intervals according to thickness. Then, the above-drawn quasi-rotational fabric ply plan design drawing is imported into another design software and lofted layer by layer into a three-dimensional graphic. Each unit layer 10 is divided and flattened in sequence at seven equally divided positions, namely, 30° division point 9-1 to 210° division point 9-7. Since the curvature at the corner position of the quasi-rotational fabric 9 is large, the carbon fiber spread fabric is relatively flat and difficult to fit the large curvature shape at the corner position. At the same time, the corner position of the quasi-rotational fabric 9 is subjected to large forces during application, so the corner position is avoided, and the lay-up cuts of each layer of spread fabric skip the large curvature corner position; the lay-up division position of each layer is set according to the surface intersection, and the cuts of each layer are staggered. Specifically, the lay-up is divided and flattened in sequence according to the lay-up angles of 30 degrees, 100 degrees, 330 degrees, 130 degrees, 270 degrees, 70 degrees, and 210 degrees. This design of the splitting position avoids the incision affecting the overall thickness of the quasi-rotational fabric 9, and at the same time avoids the relatively weak performance of the overlap position caused by the overlap of the incisions of each layer when the carbon fiber widened cloth is laid. Subsequently, S1-2 exports each unit layer 10 split and flattened in S1-1 as a two-dimensional graphic, marks the unit layer split position on each two-dimensional graphic, and writes a cutting program based on the flattened layer model. The cutting machine is used to cut the structure into a plain weave with a grid width of 16mm and a surface density of 100g / m 2 , cutting of carbon fiber stretched cloth with a thickness of 0.12mm.

[0060] The S2 process of laying the carbon fiber spreader fabric includes assembling the inner pressure plate 7-1 of the stitching mold, laying the carbon fiber spreader fabric, and assembling the outer pressure plate 7-2 of the stitching mold. First, assemble the inner pressure plate 7-1 of the stitching mold. Arrange the 23 inner pressure plates a1-a23 according to the inner shape of the quasi-rotational fabric 9 to be stitched, connect them sequentially with the wire screws 6-3 via bolts, and install them inside the large support plate fabric support portion 6-2 and the small support plate fabric support portion 8-2. Then, lay each unit layer 10 of the cut carbon fiber spreader fabric in S1-2 on the inner pressure plate 7-1 of the stitching mold according to the layup design. During the laying process, ensure that the spreader fabric is tightly attached to the inner pressure plate 7-1 of the stitching mold or the previous layer of spreader fabric.

[0061] Since the quasi-rotational fabric 9 and the inner pressure plate 7-1 of the sewing mold are irregular quasi-rotational structures with negative curvature areas, and the carbon fiber spread cloth is relatively flat and has a certain toughness, the spread cloth cannot fit tightly when laid. Therefore, when laying the first layer of spread cloth, a slender sewing needle 14 with a fiber sewing thread 13 is passed through the gap between the inner pressure plate 7-1 and the hollow inner cavity to sew and tighten the two sides of the spread cloth laid on the inner pressure plate 7-1 to fix it on the inner pressure plate 7-1 of the sewing mold 7. After that, when laying each layer of spread cloth, a curved needle pre-sewing method is used to sew and connect it with the laid spread cloth. After all the spread cloths are laid, all the pre-sewn fiber sewing threads 13 are pulled out, so as to achieve the purpose of making the spread cloth fit tightly to the inner pressure plate 7-1 of the sewing mold 7 or the previous layer of spread cloth. After the widening cloth is laid, the outer pressure plate 7-2 of the sewing mold 7 is assembled, and the six outer pressure plates b1-b6 of the sewing mold 7 are arranged according to the outer surface shape of the quasi-rotational fabric 9 to be sewn, and are connected to the wire screw sleeve 6-3 in turn through regulating bolts, and installed on the outside of the large support plate fabric support part 6-2 and the small support plate fabric support part 8-2, and the thickness of the quasi-rotational fabric 9 is controlled by compression through regulating bolts.

[0062] Among them, the S3 plans the suturing trajectory: the suturing point spacing is set according to the technical requirements, the suturing ruler 12 with the set interval is printed, and after cutting into strips, it is pasted on the partition between two adjacent straight-mouth grooves on the outer pressure plate 7-2 of the suturing mold 7, so that suturing can be performed along the length direction of the groove according to the suturing ruler 12, thereby controlling the suturing point distance.

[0063] Wherein, the S4 stitched rotary fabric: Figure 14 As shown, according to the planned sewing trajectory, a new improved lock-stitching method is used to sew the quasi-rotational fabric 9 as a whole. During sewing, the inner pressure plates a1-a23 corresponding to the sewing positions are removed, and the fabric 9 is sewn sequentially at the opening slot positions according to the marks on the sewing scale 12. First, a punching needle 17 is used to punch a pre-set hole at the sewing point. Then, a sewing needle 14 with a fiber suture thread 13 is introduced into the quasi-rotational fabric 9 along the pre-made hole to form a thread loop. A hooking needle 16 is used to hook the thread loop out of the large end opening of the quasi-rotational fabric 9. After being looped with the bottom thread 15 reserved outside the sewing mold 7, the sewing needle 14 then brings the fiber suture thread 13 out for the next cycle, thereby sewing the quasi-rotational fabric 9.

[0064] Although preferred embodiments of the present invention have been described above, the present invention is not limited to the aforementioned specific embodiments. The aforementioned specific embodiments are merely illustrative and not restrictive. Persons skilled in the art, informed by the present invention, may devise various embodiments without departing from the spirit of the present invention and the scope of protection of the claims. All such embodiments fall within the scope of protection of the present invention.

Claims

1. A method for sewing a type of rotating fabric with a narrow cavity, using a sewing device for a type of rotating fabric with a narrow cavity, the sewing device comprising a clamping and fixing device, a supporting device and a sewing mold; a supporting device is installed on the optical axis of the clamping and fixing device, the supporting device comprising a large supporting plate and a small supporting plate; a sewing mold is installed between the large supporting plate and the small supporting plate, the sewing mold comprising an inner pressure plate and an outer pressure plate; during the sewing process, the inner pressure plate and the outer pressure plate clamp the type of rotating fabric to be sewn in the middle, the small support plate and the large support plate are respectively installed at the upper and lower ends of the type of rotating fabric; the outer pressure plate is provided with equidistant straight grooves for the fiber sewing thread to pass through the type of rotating fabric, characterized in that The suturing method includes the following steps: S1. Design fabric layup: Design the fabric layup based on the shape, thickness, size of the quasi-rotational fabric and the specifications of the carbon fiber spread fabric; cut the carbon fiber spread fabric according to the layup design to form a spread fabric of appropriate size; S2. Laying the carbon fiber spreader cloth: Assemble the inner pressure plate of the stitching mold, and lay each unit layer of carbon fiber spreader cloth on the inner pressure plate of the stitching mold in sequence according to the layer layout design. After the spreader cloth is laid, assemble the outer pressure plate of the stitching mold; S3. Planning the suture trajectory: setting the suture point spacing, printing a suture ruler with set intervals, cutting the suture ruler into strips, and attaching them to the partition between two adjacent straight grooves of the outer pressure plate of the suture mold; S4, stitching of rotary fabrics: according to the stitching trajectory planned in S3, the rotary fabric is stitched as a whole using an improved lock stitching method of first punching a prefabricated hole and then passing the bottom thread outside; S4 specifically includes removing the inner pressure plate corresponding to the stitching position during stitching, and stitching the fabric in sequence at the open groove position according to the marks on the stitching ruler; first, a punching needle is used to punch a prefabricated hole at the stitching point, and then a stitching needle with a fiber stitching thread is introduced into the fabric along the prefabricated hole to form a thread loop, and a hooking needle is used to hook the thread loop out of the opening at the large end of the fabric, and after tying it with the bottom thread reserved outside the stitching mold, the stitching needle brings out the fiber stitching thread for the next cycle, thereby stitching the fabric.

2. The method for sewing a narrow cavity rotary fabric according to claim 1, characterized in that: The S1 specifically includes S1-1 ply design and S1-2 carbon fiber spread cloth cutting; S1-1 uses relevant design software to draw the upper and lower end view shapes of the quasi-rotational fabric, divides the quasi-rotational fabric into N unit layers at equal intervals according to thickness to obtain a ply plane design drawing, and then imports it into another design software to loft it layer by layer into a three-dimensional graphic, and divides and flattens each unit layer; S1-2 exports each unit layer divided and flattened in S1-1 into a two-dimensional graphic, marks the unit layer division position on each two-dimensional graphic, writes a cutting program for the cutting table according to the flattened ply model, and uses the cutting table to cut the carbon fiber spread cloth.

3. The method for sewing a narrow cavity rotary fabric according to claim 2, characterized in that: In S1-1, each unit layer is divided and flattened, and the division position of each layer is set according to the cross-plane. The incisions of each layer are staggered, and the layers are divided and flattened in sequence according to the laying angles of 30 degrees, 100 degrees, 330 degrees, 130 degrees, 270 degrees, 70 degrees, and 210 degrees. The structure of the carbon fiber widening cloth in S1-2 is plain weave, and the specifications of the widening cloth are 8-9 mm in grid width and 200-205 g / m 2 Or grid width 16 ~ 17mm, surface density 100 ~ 105g / m 2 Or the grid width is 20-21mm, the surface density is 80-85g / m 2 .

4. The method for sewing a narrow cavity rotary fabric according to claim 2, characterized in that: The carbon fiber spreader cloth in S2 is laid, first assembling the inner pressure plate of the stitching mold, arranging the 23 inner pressure plates according to the shape of the inner cavity of the stitched fabric, connecting them in sequence with wire screw sleeves through bolts, and installing them on the inner side of the fabric support parts of the large support plate and the small support plate; then laying the carbon fiber spreader cloth cut in S1-2 on the inner pressure plate in sequence according to the layup design, ensuring that the spreader cloth is tightly fitted to the inner pressure plate or the upper layer of spreader cloth during laying; after the spreader cloth is laid, assembling the outer pressure plate, arranging the 6 outer pressure plates according to the shape of the outer surface of the stitched fabric, connecting them in sequence with wire screw sleeves through regulating bolts, and installing them on the outer side of the fabric support parts of the large support plate and the small support plate, and controlling the fabric thickness by compressing the regulating bolts.

5. The method for sewing a narrow cavity rotary fabric according to claim 4, characterized in that: During the laying in S2, the carbon fiber spread cloth is tightly fitted to the inner pressure plate of the sewing mold or the previous layer of spread cloth. When laying the first layer of spread cloth, a slender suture needle with a fiber suture thread is passed through the gap between the inner pressure plates and the hollow inner cavity to sew and tighten the two sides of the spread cloth laid on the inner pressure plate to fix it on the inner pressure plate. After that, when laying each layer of spread cloth, a curved needle pre-sewing method is used to sew and connect it with the laid spread cloth. After all the spread cloths are laid, all the pre-sewn fiber suture threads are pulled out to make the spread cloth tightly fit the inner pressure plate of the sewing mold or the previous layer of spread cloth.

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